Wheel bearings

Related hot search term: wheel Full complement cylindrical roller bearing applications four-point contact ball bearing turntable turntable double volleyball
1. unloader

Unloader turntable bearings with external teeth usually three-row roller structure, approximately four meters in diameter.

2. Crane

Tower crane wheel bearings are usually used in a small four-point contact ball bearing turntable turntable or dual volleyball, no more than two meters in diameter.

3. radar antenna

Shortwave antenna generally with three-row roller bearing turntable substructure, slow rotation.

4. TBM

Shield machine with turntable bearing diameters from 2.5 m to 6 m range, and some larger diameter, these bearings work under very harsh conditions, carrying a large load bearing, corrosion resistance, short life.

5. Ladle turret

Ladle turret truck mounted crane bearing usually with three rows of roller structure, due to work under harsh conditions with dust and high temperature conditions, and on the cage, grease and seals have very high demands.

Engineering Machinery

Wheel bearings engineering machinery usually in a small four-point contact ball bearing turntable, no more than two meters in diameter.

Wheel bearing applications in various fields

Related hot search term: wheel bearing applications four-point contact ball slewing Tri-row roller gear wheel ferris wheel bearing

1. Wind Turbines

Connecting portion yaw bearing mounted on a tower and the cockpit, the pitch bearing mounted on the hub is connected with the root portion of each blade. Each wind turbine with a yaw bearings and three pitch bearings. Yaw, pitch bearing rings of material selection 42CrMo, heat treatment with the overall quenching, raceway surface hardening. Yaw, pitch bearing force situation is complex, and to withstand shock and vibration is relatively large, and therefore, requires both bearings to withstand the impact, but also bear a greater load. Wind turbines host life requirements of 20 years, a larger thrust roller bearing installation costs, thus requiring yaw, pitch bearing life have reached 20 years. Bearing rings matrix hardness is 240-280HB, able to withstand impact without plastic deformation, while the raceway surface quenching hardness 55-62HRC, contact fatigue life can be increased, thus ensuring long life bearing requirements.

2. Ship Cranes

Ship Cranes general use double Reducing ball, four-point contact ball bearing turntable Tri-row roller tooth structure, depending on the carrying capacity, three-row roller slewing bearings are usually used for heavy-duty cranes, wheel and four-point contact ball Reducing double ball bearing turntable for lightweight cranes.

Because the crane operates in -20 ° C- + 45 ° C environment, the higher kind of bearing on the mechanical properties of the material requirements.

3. Offshore Cranes

Depending on the load capacity requirements, offshore crane usually using four-point contact ball slewing and three-row roller gear wheel bearings.

Applications in offshore crane turntable bearings with special material requirements, the mechanical properties of the material to be able to guarantee the safety factor under extreme load, forgings sampling Charpy impact test can reach the average of 42 J @ -20 ° C or 27J @ - 40 ° C. Bearing finished CCS to be certified.

4. harbor mobile cranes

4 m harbor cranes usually using tooth or teeth outside diameter of three-row roller slewing bearings to withstand high overturning moment.

5. Stacker Reclaimer

Reclaimer with column wheel bearings usually ball joint, three-row roller-type and cross roller type, most ultra-three meters in diameter. Due to poor working conditions, dusty, these slewing ring bearings have a high load carrying capacity, long life, good sealing performance characteristics.

6. Ferris wheel

For four-point contact ball bearing turntable Ferris wheel on the outside diameter of 4100mm, thickness 85mm.

The introduction of slewing ring

Wheel bearings, slewing ring, also known, is a way to withstand large axial load, radial load and overturning moment of large self aligning ball bearings  Wheel bearings are generally with the mounting holes in the gear or external gear, lubrication holes and sealing devices, which enable the host compact design guide reliable, and easy maintenance.
     Wheel bearings with or without gear, external gear teeth and inside the four-point contact ball bearings, double row angular contact ball bearings, cylindrical roller bearings cross, cross tapered roller bearings and three-row cylindrical roller bearings and other kind of structure types. Where the four-point contact ball bearings with high static load capacity; Cross cylindrical roller bearings with high dynamic load capacity; cross tapered roller bearings make through preloaded bearings with a larger supporting rigidity and high rotation accuracy.
     Wheel bearings are widely used on lifting machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery and mechanical precision radar and missile launchers and other large rotary device.
Depending on the turntable bearing structure type structure can be broadly divided into the following types:
A four-point contact ball bearing turntable
2, double four-point contact ball bearing turntable
3. Cross cylindrical roller wheel bearings
4. Cross tapered roller wheel bearings
5, three-row cylindrical roller bearing turntable

Large thin wall bearing outer quenching and tempering technology breakthrough

From March last year, the project, which lasted more than six months improved, to large-scale promotion this year, the company single-row crossed roller slewing bearing a large thin-walled bearing outer quenching and tempering process improvements achieved a breakthrough: reducing distortion, reduce scrap rates, removal of all seized and subsequent shaping, to the stress process, saving time and labor costs, economic benefits are considerable.
As soon as possible in order to break this bottleneck, last March, the company has set up a project team bearing the main research content is the medium and large thin-walled bearing outer heat deformation control. First, in the application of the device, the project team proposed to replace the new roller furnace mesh belt furnace. Because the former use of radiation heating, the temperature can be precisely controlled, better heating uniformity, can greatly reduce the amount of deformation. Meanwhile, the roller furnace with nitrogen and propane as a protective atmosphere that allows oxidation products through appropriate to achieve the desired hardness, to meet different customer requirements.
The new production line roller furnace into operation after a period of time, the question came up: the workpiece into the furnace to be of special baskets, large deformation proportion remains high specification products. The project team developed a project implementation plan, schedule lists: the first phase of small batch processing, such as the promotion of a wide range of process maturity and then, at the same time according to the time schedule, to reduce the amount of deformation also made clear the indicator. Through several experiments, on the one hand, optimized display mode, eventually completely without baskets directly to the workpiece placed on the stove, so a single volume into the furnace to increase production efficiency also will increase; on the other hand, the project team By replacing the quenching oil, in accordance with the product model to set the stirrer speed and time, so that the quenching oil is more evenly distributed in the surface, can be achieved to ensure the hardness after quenching and qualification requirements of the microstructure, in order to better control the amount of deformation . After these improvements reflect subsequent grinding staff is very good. They say that good quality new processing technology, especially small sag, the rejection rate is almost zero.
Bearing outer ring after quenching and tempering after heat treatment, can improve product strength, hardness, wear resistance, fatigue strength and toughness. Previously, the company slewing ring bearings technology equipment used mesh belt furnace and furnace roller quenching, tempering, there is always some distortion problems affecting the efficiency quality. Especially greater than 150 mm in outer diameter of the large product, the deformation is more pronounced. In recent years, bearing the company's market has been expanding from the traditional automotive industry market more towards wind power bearings, machine tool bearings and other emerging industries range, product specifications growing, medium and large bearing outer ring more and more . How to solve the problem of a product deformation caused by the traditional process, the company has become an urgent need to address the "big obstacle."
Because deformation meet the requirements, the vast majority of medium and large companies are now bearing products do not need a full inspection, plus reduce the stress to both shaping and procedures, in the same middle class, the product circulation accelerated greatly improved production efficiency. Furthermore, the bearing outer ring taper becomes smaller, the subsequent grinding allowance is also reduced. In terms of cost, plastic, five employees to streamline the inspection process, at least an annual payroll savings of 200,000 yuan; the same time, to reduce stress and subsequent shaping of the original annual electricity use of 40,000 yuan, the benefits of these savings are very impressive .
After six months of exploration and constantly try to verify quenched by the end of last year, bearing the company double row ball slewing bearing a large amount of deformation of thin-walled outer ring has basically met the technical criteria deformation proportion dropped to 80% more than before.
Today, the company is working to transform the original roller furnace, so that you can promote the use of new technology as soon as possible. Heat treatment unit plan.

Design features and classification of thin wall bearing

High precision thin section bearing  very quiet and strong carrying capacity. These ball bearings, there are three design, and extremely small, most of the cross-section is square. In these series, even larger shaft diameters and bearing bore, the cross-section remains unchanged. These bearings are therefore called constant section. It is this characteristic of the standard iso series with the thin-walled rings bearing conventional bearing distinguished. Therefore, a larger cross-section can be selected using a stronger bearing carrying capacity without changing the shaft diameter. Thin wall bearing rings can be designed to require very little space is extremely light and bearings.
Thin wall bearing rings can be deep groove ball bearings, four point contact bearings, thin section angular contact bearings  In different series are provided over a variety of designs. Series depends on the cross-sectional size. Match ball with the series.
Deep groove ball bearings can support bi-directional axial load and radial load.
Four point contact bearings can support axial loads in both directions as well as radial loads; therefore they are in contact with the double row angular ball bearings running the same way.
Angular contact ball bearings can match the optimal number of balls and the contact angle of 30 °. They support radial loads than deep groove ball bearings or four point contact bearing higher, and can support axial loads from the same direction. For special needs, angular contact ball bearings are also available as matched bearings provide. Therefore, these combinations of stiffness and load capacity than a single bearing products to be much higher.

The reason of aligning ball bearing failure analysis

aligning ball spherical ball bearings cause of failure is often multifactorial, all design and
manufacturing process and the impact of factors related to failure of the bearing, it is not easy to judge the analysis. Under normal circumstances, in general, can be considered and analyzed both from the use of factors and internal factors.
Use the adjustment factor mainly refers to the installation, use and maintenance, repair and other maintenance meets the technical requirements. Installation conditions is one of the primary factors in the use of the factors bearing is often caused due to improper installation package bearing the stress state changes between the various parts, aligning ball bearing in a normal state of operation and early failure. According to the spherical plain bearings installation, use, maintenance, maintenance of the technical requirements for operation of
the bearing to withstand load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, abnormal immediately find reasons to adjust to return to normal. In addition, the quality of the grease and the surrounding medium, and the atmosphere is also important for analysis testing.
Internal factors mainly refers to the design, manufacturing process and material quality three factors determine the quality of the bearing.
First, along with a reasonable structure design has advanced, will have a longer bearing life. Manufacture of bearings generally through forging, heat treatment, turning, grinding and assembly of multi-channel processing. The reasonableness of the processing technology, advanced, will also affect the stability of the bearing life. Which affect the quality of the finished product bearing heat treatment and grinding processes, tend to have a more direct relationship with the failure of the bearing. Recent studies on the bearing surface metamorphic layer show that the grinding process is closely related to the bearing surface
quality.
Metallurgical quality aligning ball four point contact ball slewing bearing material was the main factor affecting the early Rolling failure. As metallurgical techniques (such as bearing steel vacuum degassing, etc.) advances, improved quality of raw materials. Raw material quality factors in bearing failure analysis in the proportion has decreased significantly, but it is still one of the main factors bearing failure. The adequacy of the selection is still bearing failure analysis of factors must be considered.
The main task of aligning ball bearing failure analysis is based on a lot of background material, analysis of data and failure modes, failure to identify the main factors causing the bearing to make targeted improvements to extend bearing service period, to avoid bearing occurrence of unexpected early failure.

Comprehensive analysis of angular contact ball bearings

Angular contact ball bearings, which is commonly referred to as angular contact ball bearings, which allow the operating speed and deep groove ball bearings are similar, but support more rigid than the deep groove ball bearings, mainly because of the bearing can be loaded more of the ball, the radial load carrying capacity than ordinary ball angular contact bearing large, but also to withstand large axial load or bear pure axial load. These bearings are generally used in pairs for small span rigid support shaft or double precision spindle, can improve the rigidity of the bearing system.
Structural features of angular contact ball bearings Bearing this structure can withstand the radial and axial loads in one direction. Ball with inner, outer ring 15 °, contact angle 25 °, 30 ° or 40 ° of. The contact angle, the greater the axial load carrying capacity. Under normal circumstances, the two single row angular contact ball bearings opposed, adjusted internal clearance to use.
The two radial bearings, combined bearings pairs called pairs of double bearings. Often, by the same pairs of double-bearing angular contact ball bearings or the same combination of tapered roller bearings.
Double pairs of species, there is a positive paired with outer front double, double pairs parallel with the back of the back pairs of double, and in the same direction.
df and db-shaped form pairs of double bearing, can bear radial load and axial load in two directions, dt shape the direction of the axial load for a big occasion.
Double row angular contact ball bearings contact ball bearing outer ring on the back of two separate angles coincide, the inner and outer rings are each integrated structure. Therefore, the import of this structure bearing, thrust load capacity having two directions.
1, a = 15o angular contact ball bearing 2, a = 25o angular contact ball bearings 3, a = 40o angular contact ball bearings 4, a = 15o-speed sealed angular contact ball bearings 5, a = 25o of high speed seals angular contact ball bearings 6, a = 15o-speed sealed angular contact ceramic ball bearings 7, a = 25o-speed sealed angular contact ceramic ball bearings 8, back to back pairs of angular contact ball bearings [70000c / db type]
9, face by face pairs of angular contact ball bearings [70000c / df type]
10, the series pairs of angular contact ball bearings [70000c / dt type]
11 ball gap double row angular contact ball bearings 12, No ball gap double row angular contact ball bearings 13, one side with a double row angular contact ball bearings 14 dust cover, dust cover both sides with double 15 row angular contact ball bearings, double row angular contact ball bearings with a ring 16 side, the main purpose row angular contact ball both sides with a double row angular contact ball bearing ring angular contact ball bearings slewing ring bearing: machine tool spindles, high-frequency motors, gas turbines, centrifuges, small car front wheel, the differential pinion shaft.
Double row angular contact ball bearings: pump, blower, air compressor, various types of transmission, fuel injection pump, printing machinery.

India's large demand for construction machinery will give an opportunity to the Chinese market

In recent years, with the gradual slowdown in the pace of economic development in China, the development of construction thrust roller bearing machinery industry has entered a more difficult course, but we look to look to neighboring countries, with a large number of infrastructure projects undertaken to increase their demand for construction machinery and equipment, and our good performance engineering machinery products and cost-effective, as they are the best choice, which for China's construction machinery enterprises, is undoubtedly a better market is another.

It is understood that in the next five years, India will be focused mainly on the infrastructure piece, as the major driving force to accelerate the transformation of the economy, continued growth in the face of India's upcoming future infrastructure projects, which brought a huge market for construction machinery in India opportunities, but subject to various factors and constraints, the current development of construction machinery manufacturing industry in India is also relatively weak.

It is understood that, in India, the local purchase of construction machinery should be at least two years to properly put to use, while in China's construction machinery purchased only need six months to properly put into use, by contrast, China's construction machinery and equipment and Compared to India, more competitive and better able to meet with a large number of Indian construction machinery market demand.
Has experienced five consecutive years of 30% of the market growth, the Indian machine tool industry is facing a sharp decline in demand caused by customer demand declined. Despite such challenges, machine production in India is still basically the same as in previous years to maintain growth, including 86% of the contribution from the metal cutting machine tools, metal forming machine tools rest.

Faced with the global economic downturn, the Government of India in order to restore and maintain the momentum of industrial growth has also taken a series of positive responses.

CNC machine tools in India occupies about 65 percent of all sales in the machine. Throughout the slim ball bearing industry, lathes, machining centers, special machines, presses and grinders accounted for 80% of India's total 2008 production of machine tools, manufacturing evolving pushed to the status of India's ninth largest machine tool consumer market. Promote the growth of new industries demand for large machine tools, leading to increased imports. Speaking on metal processing machines, imported products accounted for 75% of India's domestic market share throughout. From the macroeconomic point of view, in April 2008 to March 2009 global economic downturn in the year, India's economy is smooth, and its gross domestic product growth of more than 5%. In the previous three years, India's GDP has maintained a continuous growth of more than 9% of the situation, making it the world's second-fastest economic growth in the country.

From the competitiveness of the industry itself, the Indian machine tool has the following characteristics: India and abroad promising users the ability to provide high-performance machine tools; efforts into high productivity, high efficiency, more cost competitive industry; attaches great importance to the quality of ; to establish close relationships with suppliers and integration of secondary suppliers; actively with the automotive industry, the defense industry and other customers to communicate.

Precision angular contact ball bearings

Angular contact ball bearings provide high rigidity bearing arrangement for a composite load conditions. Double row angular contact ball bearings can support and positioning bidirectional machine axis, thereby simplifying the bearing arrangement. And has a sealed design. Four-point contact ball bearings can save space in a two-way axial load conditions.
Angular contact ball bearings can support radial and axial loads. Able to work at higher speeds. The contact angle, the higher the axial load carrying capacity. Single row angular contact ball bearings can withstand axial load in one direction, while the radial load, will cause additional axial force. And the only limit axial displacement in one direction, the shaft or housing. If paired installation, so that one pair of self aligning ball bearing outer ring relative to that wide side face of wide and narrow side facing the narrow end. This can avoid additional axial force, and the shaft or housing to limit the axial clearance range in both directions.
Angular contact ball bearing raceway for its inner and outer rings relative displacement on the horizontal axis, so it can bear radial load and axial load - combined load (single row angular contact ball bearings can withstand axial load in one direction, So often adopted installed in pairs). Cage made ​​of brass, synthetic resins, etc., depending on the bearing forms, and application conditions.
Precision angular contact ball bearings problem
There precision angular contact bearings and precision has a very hit no difference
(1) bearing - shaft assembly seat hole mount
Heated seat hole so heated 20 ~ 30 ℃, with a continuous gentle pressure to the bearing - shaft assembly mounted seat hole; before adjusting cover, tighten the amount of the front cover of 0.02 ~ 0.05μm, the dial gauge positioning shaft, the first table inconsistent backseat hole surface, the axis of rotation of the front and rear seats to measure the bearing bore concentricity. In the end face of the outer bearing as a benchmark indicator of the conflict in the journal header surface, measuring the rotation of the shaft runout, requiring error 10μm or less.
(2) measuring the shaft and the four point contact ball slewing bearing hole size to determine with precision bearings, with the following requirements:Take the inner ring interference fit with the shaft, the amount of interference 0 ~ + 4μm (at light load, when high precision is 0); the outer ring and the bearing hole to take a clearance fit, clearance volume 0 ~ + 6μm (but at the free end of the bearing When using angular contact ball bearings, but also increase the gap); the shaft and housing bore surface roundness error of 2μm or less parallel to the end face of the bearing spacer to be used in the 2μm or less, and the inner end face of the external end face of the shaft shoulder beating 2μm or less; retaining shoulder of the housing bore axis beating 4μm or less; cover the face before the end of the axis of the spindle runout at 4μm or less.
(3) the free end of the bearing may be selectively placed in a position to offset the bias, the position of the rear bearing support mounted to the housing, as far as possible offset roundness and concentricity deviation offset each other.
(4) a fixed end miniature ball bearings

 mounted on the shaft before
Heating bearings so that temperature 20 ~ 30 ℃, oil press the bearing onto the shaft; the tight sets against the shaft and bearing an appropriate pressure against the end face axially positioned; the spring balance tape volume in the bearing outer ring on whether the pre-load starting torque measuring method stipulated verify a substantial change (even if the bearings are correct, but due to meet or maintain the deformed frame, pre-load is also likely to change). After the bearings were cleaned thoroughly washed with clean kerosene, grease lubrication, the first containing 3% to 5% of the grease into the bearing organic solvents for degreasing, then quantitative grease gun oil filled bearings (accounting bearing space volume of 10% to 15%).

Outside ball bearings

Outside ball bearings bearing consists of both sides with a sealed spherical ball bearings and cast (or steel stamping). Same spherical ball bearings and deep groove ball bearings inside the structure, but such a bearing inner ring is wider than the outer ring outer ring has a truncated spherical outer surface and a concave spherical bearing to match the self-aligning. There is a gap between the hole and the shaft is usually such a slim ball bearing, with the top wire, heart, sets tight sets or the bearing inner ring is fixed to the shaft, and rotate with the shaft.
Structural features
Spherical ball bearing is actually a variant of deep groove ball bearings, INA bearings is characterized by its outer diameter surface of the sphere, you can play with the corresponding inner concave spherical bearing self-aligning effect. Although its basic properties and deep groove ball bearings should be similar, but because most of the bearings used in the rough machine, the installation location is not precise enough, the axis of the shaft and housing bore neutral difference, or the long axis deflection like the case of large, and the precision of the bearings themselves is not high enough, some structure is relatively rough, so the actual performance of the performance specifications of the deep groove ball bearings the same play a considerable discount.
Spherical ball bearings with the top wire is applied to large stiffness difference deflection through shaft, the self aligning ball bearings with seals on both sides, can be tight to prevent dirt intrusion, had filled the right amount of lubricant at the factory before installation without cleaning, not require additional lubricant, the top end of the wire protruding screws on the bearing inner ring on the shaft tightened. Permissible axial load should not exceed 20% dynamic load rating.
With eccentric outer spherical ball bearings and spherical bearings performance with the top wire of the same, only the top wire is not on the inner ring, but in the eccentric sleeve. Bore tapered bore spherical ball bearings with 1:12 tapered bore taper, can be installed directly on the tapered shaft, or by means of an adapter bushing is mounted on the optical axis without shaft shoulder, and fine-tune the bearing clearance.
The use of spherical bearings
Spherical bearing the same internal structure and deep groove ball bearings, but this is wider than the outer ring of the ball and roller combined bearing

 inner ring, an outer ring has a spherical outer surface and a concave spherical bearing to match the self-aligning, compact, easy handling, supported using simple, commonly used in mining, metallurgy, textiles, transportation machinery.

Installation and maintenance of wheel bearings

Slewing ring bearings is a way to withstand the large axial load, radial load and overturning moment of large bearings. Wheel bearings generally come with mounting holes, internal gear or external gear, lubrication holes and seals, which enables a host compact design guide reliable, easy maintenance.Have toothed wheel bearings, the outer and inner tooth tooth four-point contact ball bearings, double row angular contact ball bearings, crossed cylindrical roller bearings,
tapered roller bearings and cross three-row cylindrical roller thin section angular contact bearings, and other kind of structure type. Where the four-point contact ball bearings with high static load capacity; Cross cylindrical roller bearings with high dynamic load capacity; cross-tapered roller bearings through preloaded make bearings with a larger supporting rigidity and high rotation accuracy.
Wheel bearings are widely used in lifting the machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery and mechanical precision radar and missile launchers and other large rotating equipment.
1, the turntable bearing installation    FAG wheel rolling mill bearing before installation, first host of the mounting surface inspection, require support should have sufficient strength to be machined connecting surfaces, smooth surface free of debris and burrs. For the flatness can not be machined to achieve the desired, the injection may be used to make high-intensity special plastic filler, to ensure the accuracy of the mounting surface and means for damping. FAG wheel bearing rings have hardened soft-band region, which in the end face of
the ferrule are marked "S", should be installed so that the soft band position often placed in non-load area or load area (plug hole is always located soft with Office).
When installing FAg wheel bearings, should act to advanced positioning, cross-tighten the mounting bolts and check bearing swivel case. Tighten the bolts should have sufficient preload, its preload bolt material should yield 70% limit. Mounting bolts should be equipped with tempered flat washer and spring washer is strictly prohibited.
2, FAG wheel bearings installed and put into operation and maintenance of wheel bearings after 100 hours of continuous operation, check the mounting bolts should be fully meets the requirements of tightening torque, after 500 hours of continuous operation repeat the inspection every. FAG wheel bearings installed should be filled with the right amount of grease, and should be filled side to side swivel bearing the grease evenly distributed.
Wheel bearings at work for some time, will inevitably lose some of the grease, so the normal operation of the wheel bearings at intervals of 50 to 100 hours after a grease should be added.
3, transport and storage of spindle bearing FAG wheel bearing during transport, should be placed on the vehicle, sliding and prevent proper measures to prevent vibration, plus auxiliary

support when necessary.

Wheel bearing applications in various fields of anatomy

Wheel bearings, slewing ring, also known as, is a way to withstand the large axial load, radial load and overturning moment of large bearings. Wheel bearings generally come with mounting holes, internal gear or external gear, lubrication holes and seals, which enables a host compact design guide reliable, easy maintenance.Have toothed wheel bearings, the outer and inner tooth tooth four-point contact ball bearings, double row angular contact ball ferris wheel bearing, crossed cylindrical roller bearings, tapered roller bearings and cross three-row cylindrical roller bearings, and other kind of structure type. Where the four-point contact ball bearings with high static load capacity; Cross cylindrical roller bearings with high dynamic load capacity; cross-tapered roller bearings through preloaded make bearings with a larger supporting rigidity and high
rotation accuracy.
Wheel handpiece bearing are widely used in lifting the machinery, mining machinery, construction machinery, port machinery, shipbuilding, machinery and mechanical precision radar and missile launchers and other large rotating equipment.
Wheel bearings used in various fields.
1. Wind Turbine
The connecting portion of the tower with a yaw bearing is mounted in the cockpit, the pitch bearing is installed with the hub at the root portion of each blade is connected. Each wind generator with a yaw bearing and three pitch bearing. Yaw, pitch bearing ring material selection 42CrMo, heat treatment with the overall quenching, raceway surface hardening. Yaw, pitch bearing force the situation is complex, and to withstand shock and vibration is relatively large, and therefore, require both bearings to withstand the impact, but also bear a greater load. Wind turbines host life requirements of 20 years, a larger bearing installation costs, thus requiring yaw, pitch bearing life have reached 20 years. The matrix hardness of the bearing rings 240-280HB, able to withstand impact without the occurrence of plastic deformation, while the raceway surface quenching hardness 55-
62HRC, contact fatigue life can be increased, so as to ensure long bearing life
requirements.
2. Ship Cranes
Ship Cranes general use double Reducing ball, four-point contact ball bearing turntable Tri-row roller tooth structure, depending on the load carrying capacity, three-row roller wheel bearings typically used for heavy-duty cranes, four-point contact ball slewing and Reducing double ball bearing turntable for light cranes.
Since the crane at -20 ° C - +45 ° C under work environment, high class material bearing on the mechanical performance requirements.
3. offshore crane
Depending on the load capacity requirements, offshore crane usually using four-point contact ball slewing and three-row roller gear wheel bearings.
Application in offshore crane turntable bearing with special material requirements, the mechanical properties of the material to be able to guarantee the safety factor under extreme load, forging sample Charpy impact test to reach the average of 42J @ -20 ° C or 27J @ -40 ° C. Bearing Classification Society certification to be finished.
4. harbor mobile cranes
4 meters of harbor cranes usually use internal or external gear teeth diameter three-row roller slewing bearings to withstand high overturning moment.
5. Stacker Reclaimer
Reclaimer with column wheel bearings usually ball joint, three-row roller and cross-roller type, most ultra-three meters in diameter. Due to poor working conditions, dusty, these bearings have a high load capacity, long life, good sealing performance characteristics.
6. Ferris Wheel
For four-point contact ball bearing turntable Ferris wheel on the outside diameter of 4100mm, thickness 85mm
7. unloader
Unloader wheel bearings with external teeth usually three-row roller structure, about 4 meters in diameter.
8. Crane
Tower crane used wheel bearings usually small size four-point contact ball bearing turntable or dual volleyball dial diameter of not more than two meters.
9. The radar antenna
Shortwave antenna generally with three-row roller bearing turntable sub-structure, the rotation is slow.
10. TBM
Shield machine with turntable bearing diameters from 2.5 m to 6 m range, some larger diameter, these bearings working under very harsh conditions, bearing carrying a large load, corrosion resistance, short life.
11. ladle turret
Ladle turret slewing bearing usually with three-row roller structure, due to work under harsh conditions with dust and high temperature conditions, and on the holder, grease and seals have very high demands.
12. Construction Machinery
Wheel ring bearing typically used in construction machinery in a small four-point contact

ball bearing turntable, a diameter of not more than two meters.

How to identify bearing

    Identify the quality of the equipment bearing, we usually carry out the following aspects:
    The packaging is clear double row tapered roller bearings under normal circumstances, the regular manufacturers brand has its own dedicated external packaging designers to design and make arrangements for the clearance of the factory production conditions for production,therefore, in terms of product packaging lines the color should be very clear and unambiguous.
    Seal word is clear or not
    Bearing products every body will be in products thin section bearing the words printed on its brand, label and so on. Although the font is very small, but regular manufacturers of products using the stamp printing technology, but without the heat-treatment is carried out embossing, so the font may be small, but a deep concave, very clear. And under normal circumstances, not only fuzzy fonts counterfeit products, due to the rough printing technology, fonts floating on the surface, some of them can be easily erased or manually by hand signs seriously.
    Are there hetero ring
    Left hand holding the bearing sleeve body, right hand toggle coat a small margin to rotate back and forth, listening to the bearings during operation if there hetero ring. Because the majority of counterfeit products production conditions behind, completely hand-workshop-type operation, slim ball bearing the body in the production process will inevitably be braced with dust, sand a class of impurities, so in the bearing is rotating when there will be a hybrid ring or the phenomenon does not run smoothly . This is to determine whether the product by strict production standards, and the key with the regular operation of the
machine manufacturer's brand products.
     Are there traces of oil muddy surface
     Are there traces of oil muddy surface which requires that we should pay special attention to when buying imported bearings. It is easy to leave a thick oil stains Because there is a certain gap between domestic and foreign anti-rust technology advanced manufacturing country, therefore bearing body rust treatment, feeling sticky sticky thick hand contact when, while foreign original on imported bearings hardly see any trace of rust preventive oils. According to insiders, particularly careful person can smell the bearings to a special flavor, which is anti-rust oil taste.
     Chamfer is uniform
     The so-called bearing chamfer, which is the junction of the horizontal surface and vertical surface, counterfeit products slewing ring bearing

 production technology due to restrictions in parts of these corners was unsatisfactory treatment, which we can easily identify.
Bearing Package Packaging fair share in the manufacturing of packaging and packaging bearing completed and passed the test, namely cleaning and anti-rust treatment, then put the package in order to achieve water, moisture, dust, shock, maintaining quality and precision bearings and the purpose of ease of use and sale.

The solution of slewing ring bearing noise

   Slewing ring bearing noise common to have two kinds of dust acoustic sound and scars solution is as follows:
   (1) The control method of the dust acoustic
    Rotary branch within the dust and other foreign matter, non-periodic vibrations occur, the so-called dust acoustic, vibration and noise uncertain size, and with or without.Sound dust control methods: improving the cleaning method slewing ring / turntable bearing, the bearing before installation, shaft, housing bore all the rigorous cleaning and matching parts clean; remove foreign objects inside the lubricant; to improve angular contact ball bearing seals; avoid the use of impure material or a foreign body embedded plastic cage.
   (2)The control method scars sound
    If slewing ring rolling surface cracks, indentations or corrosion occurs as a rivet as periodic vibration and noise, the cycle may be fixed but most of the speed of a certain relationship, the scars on the channel will be continuous occurs, wounds hidden when on the ball, and this noise and there are some changes with the installation and lubrication conditions.
    Such noise control method: When installing not knock bearing, the bearing and the shaft bearing assembly before loading to prevent loading ramp when the bearing; when the stock to prevent shock and vibration to prevent bearing corrosion and transport; the use of high viscosity grease .
   (3) Noise and Countermeasures lubrication caused by factors Lubricant selection errors, lack of lubricant or the occurrence of aging sclerosis, can cause slewing ring / turntable bearing vibration and noise, and this noise is not necessarily the rule. In this case, only the choice of a suitable lubricant, lubricant adjust its volume, extend lubricant life and reasonably determine the replacement cycle.
   (4) the noise associated with the host and Countermeasures This noise is not simply caused by a handpiece bearing

, and thus to find a single reason from the bearing areas is ineffective to deal with a host full attention, to improve the performance of the host when necessary. The main narrative is now common in motor beeps and rack resonant sound.

thin section bearing characteristics of deep groove ball bearing

Deep groove ball bearing has the advantages of simple structure, compared with other types of easy to achieve high manufacturing accuracy, so easy to become series mass production, lower manufacturing costs, the use of very common. Select the radial internal clearance greater axial bearing Thin section bearings‍ capacity, under purely radial force when the contact angle is zero. The action of axial force, contact angle greater than zero. General use of the stamping cage, car solid cage, sometimes also used nylon frame. Deep groove ball bearing except basic types, there are a variety of forms, such as: deep groove ball bearings with dustproof cover; deep groove ball bearings with rubber sealing ring; deep groove ball bearings with snap groove; deep groove ball bearing a large load capacity ball gap; double deep groove ball bearings. But they all share the following characteristics:

Continuous groove type 1, high precision bearings‍ each ring in the structure of deep groove ball bearing has a cross-section of approximately spherical perimeter 1/3 roller. It is mainly used to bear radial load, also can withstand the axial load;

2, in the bearing radial clearance increases, with the nature of angular contact ball bearing, the axial load bearing two directions alternating;

3, small friction, high speed;

4, has the advantages of simple structure, low manufacturing cost, Spherical roller bearings‍ easy to manufacture high precision;

5, the general methods of stamping cage diameter greater than 200mm, the bearing or high-speed operation, the use of the car business entity retainer.                                                                                ‍

LYHY slewing ring bearings Bearing Cleaning

Skateboard bearings cleaning is very simple, get the bearing from the board down with a paper towel to grease the bearings, wipe the stain, wipe the wheels inner wall also high precision bearings‍ will change around the front and rear wheel bearings are smooth and look good. Probably every time, the use of high temperatures generated during rotation of the bearing plate, rubber wheels and bearings will close with a week to clean the walls, causing the wheel to change or replace the bearing so often inconvenient when removing the wheel bearing in accord, reali slim bearings‍ to avoid trouble can simultaneously clean the bearings.

Bearing oil

Remember to clean the oil, a wide range of oil, edible oil all OK, but it was said to buy back the bearing first soaked in gasoline in the week, so it is a waste of gasoline, buy back, after a week cleaning of use when the oil does not matter, bought back the bearing lubricant to prevent bearing rusty oil stored in the oil with the board when you can send bearing, clean the first time when oil cleared on oils, these oils do not play lubrication, simply can mobile crane bearing‍ not be heated like a cylinder of liquid only take effect the same amount, only to prevent rust, but is often difficult with the plate bearing rust.

thin section bearing Install accuracy calibration method

After the angular contact ball bearing into the spindle, install precision calibration sequence is as follows (with shaft diameter of 60 100mm ordinary lathe for example):

(A) measuring the shaft and housing bore size, to determine with precision bearings, with the following requirements:

Take the inner ring and the shaft interference fit, crossed roller bearings‍ the amount of interference 0 ~ + 4μm (at light load, when precision is 0); take the outer ring and the bearing bore clearance fit, clearance volume 0 ~ + 6μm (but at the free end of the bearing when using angular contact ball bearings, but also increase the gap); shaft and housing bore surface roundness error in 2μm or less, face parallelism bearing spacer used in the 2μm or less, the end face of the shaft shoulder end foreign beating in 2μm or less; retaining shoulder of the housing bore axis beating 4μm below; cover the front end face of the spindle axis beating 4μm or less.

(2) a fixed end bearings mounted on the shaft before

After the bearings were cleaned thoroughly washed with clean kerosene, grease lubrication, the first containing 3% to 5% of the grease into the bearing organic solvents for degreasing and cleaning, and then quantitative grease gun oil filled bearing (accounting bearing space volume of 10% to 15%); heating bearings make heating 20 ~ 30 ℃, oil presses the bearing into the shaft; pressure in the tight sets with suitable pressure shaft and bearing high precision bearings‍ against the end face axially the spring balance tape volumes on the bearing outer ring, pre-load starting torque measuring method stipulated check whether a substantial change (even if the bearing is correct, but due to meet or maintain the deformed frame, pre-load there; positioning changes possible).

(3) the bearing shaft assembly into the seat hole

Heated seat hole so that heating 20 ~ 30 ℃, with continuous gentle pressure on the bearing shaft assembly into the housing bore;? Before adjusting cover, tighten the amount of the front cover of 0.02 ~ 0.05μm, to the outer end face of the bearing housing benchmark indicator of the conflict in the journal header surface, the axis of rotation measured beat, require error 10μm or less; will dial gauge positioned reali slim bearings‍ on the shaft hole in the surface of the back seat of the header conflict, the rotation axis to measure the bearing housing bore concentricity before.

(4) the free end of the bearing may be selectively placed in the position deviation offset mounted to the bearing support position, to offset possible concentricity and roundness deviation of the deviation between each other.‍

thin section bearing How to identify bearing

The packaging is clear double row tapered roller bearings under normal circumstances, the regular manufacturers brand has its own dedicated external packaging designers to design, production conditions and arrangements for clearance of the factory production of production, therefore, in terms of product triple row roller slewing bearing‍ packaging lines the color should be very clear and unambiguous.

Seal word is clear

Every product bearing products bearing the body will be in the printed word has its own brand, label and so on. Although the font is very small, but regular manufacturers of products using the stamp printing technology, but without the hot embossing process is carried out, so the font was small, but a deep depression, very clear. And under normal circumstances, not only fuzzy fonts counterfeit products, due to the rough printing technology, fonts floating on the surface, and some can be easily wiped off by hand or hand signs seriously.

Is there a hybrid ring

Left hand holding the bearing sleeve body, right hand toggle coat a small margin to rotate back and forth, listening to the bearings during operation if there is mixed response. Most counterfeit products due to production conditions of backwardness, completely hand-mill operation, bearing the body in the crossed roller bearings‍ production process will inevitably be braced with dust, sand a class of impurities, so that the rotation of the bearing ring or when there will be hybrid phenomenon does not run smoothly . This is to determine whether a product comes from a strict production standards, and the key with the regular operation of the machine manufacturer's brand products.

LYHY slewing ring bearings Chamfer is uniform

Are there traces of oil muddy surface which requires that we should pay special attention to when buying imported slewing ring ‍bearings. Very easy to leave a thick oil stains Because there is a certain gap between domestic and foreign advanced technology of rust country of manufacture, so the bearing body cross roller bearings‍ rust treatment, feeling sticky sticky thick hand contact when, while foreign original on imported bearings hardly see any signs of rust oil. According to insiders, particularly observant person can smell the bearings into a special flavor, which is anti-rust oil taste.

The so-called bearing chamfer, which is the junction of horizontal surface and vertical surface, counterfeit products bearing production technology due to restrictions in parts of the processing of these corners was unsatisfactory, which we can easily identify.

Bearing Package

Packaging fair share in the manufacturing of packaging and packaging bearing completed and after passing inspection, namely cleaning and anti-rust treatment, then put the package in order to achieve water, moisture, dust, shock, maintaining quality and precision bearings and the purpose of ease of use and sale.

Bearing inner packing by rust period is divided into triple row roller slewing bearing‍ three categories:

① Short rust on packaging: rust period of 3 to 6 months, for large volume shipments to the same subscriber, then put the bearing used in the short term. By mutual agreement, to facilitate the use of the principle, the use of simple packaging.

② general rust on the packaging: rust period of one year for general purpose bearing.

③ long rust-proof packaging: rust of two years for special and precision bearings.‍

slim ball bearing Angular contact ball bearing

Angular contact ball bearing is a bearing, it can support radial and axial loads. Able to work at higher speeds. The contact angle, the higher the axial load carrying capacity. High-precision and high-speed bearings usually take the contact angle of 15 degrees. In the axial force, the contact angle will increase. Angular contact ball bearings can support radial and axial loads. Able to work at higher speeds. The contact angle, the higher Thin section bearings‍ the axial load carrying capacity. High-precision and high-speed bearings usually take the contact angle of 15 degrees.

In the axial force, the contact angle will increase. Single row angular contact ball bearings can withstand axial load in one direction, while the radial load, will cause additional axial force. And the only limit axial displacement in one direction shaft or housing. If paired installation, so that one pair of bearing outer ring relative to that wide side face of wide and narrow side facing the narrow end. This can avoid additional axial force, and the shaft or housing to limit axial clearance within the range in both directions.

Angular contact ball bearing raceway for its inner and outer rings relative displacement on the horizontal axis, so it can support radial load and axial load - combined load mobile crane bearing‍ (single row angular contact ball bearings can withstand axial load in one direction, So often adopted installed in pairs).

Cage made ​​of brass, synthetic resins, etc., depending on the bearing forms, and application conditions.

Angular contact ball bearings: 7000C-type (α = 15 °), 7000AC type (α = 25 °) and 7000B (α = 40 °) of several types. This kind of bearing outer ring of locking in the general inner and outer rings can not be separated, can withstand radial and axial joint load and axial load in one direction. Axial load capacity from the contact angle, the contact angle is large, the ability to withstand high axial loads. This kind of bearing can limit the axial displacement in one direction shaft or housing.

The main purpose

Single row angular contact ball bearings: machine cross roller bearings‍ tool spindles, high frequency motors, gas turbines, centrifuges, small car front wheel, differential pinion shaft

Double row angular contact ball bearings: pump, blower, air compressor, various types of transmission, fuel injection pumps, printing machinery

Installation Tips

High-speed precision angular contact ball bearings, mainly used for high-speed rotating load lighter occasions, requiring high precision bearings, high speed, low vibration and low temperature rise certain life. Often high-speed spindle bearing installed in pairs, the inner surface grinder spindle speed key component parts.‍

thin section bearing bearing

High-speed precision angular contact ball bearing life of a great relationship with the installation, you should note the following

1 bearing should be installed in the clean, clean room, to carefully matching the bearing, the bearing spacer to be after grinding, while maintaining the inner and outer contour of the spacer premise spacer should be controlled in parallel 1um the following;

2 bearings should be cleaned before installing clean, cleaning the inner slope upward, feel should be flexible, no sense of stagnation, dry, placed in a specified amount of grease, oil mist lubrication should be placed in the case of a small amount of oil mist;

3 bearing installation tool should be used exclusively, even by force, is prohibited beat;

4 bearing store should be clean air, non-corrosive gases, relative humidity less than 65%, long-term storage should be regularly rust.

Maintenance 1, when the bearing to miniature linear bearings‍ run to a certain period of time (or Paul raised maintenance period), will be bearing all removed;

2, with a clean diesel or kerosene soaked with cleaning bearings, if technical conditions for the best open closures cleaning;

3, air dry after cleaning cleaning oil, visual inspection for damage;

4, with about a 150mm, angular contact ball bearing diameter equal to the inner diameter of the stick (preferably hollow tube), one end fixed to a bearing;

5, rapid rotation of the bearing by hand while the stick (wooden pipe) and the other end on top of the microphone audio amplifier or listening to the debate on the ear bearing crossed roller bearings‍ rotation noise;

6, horizontal toggle the fixed bearing sticks, check bearing wear loose;

7, loose serious, turn the noise is too large, there is a serious defect FAG bearings should be eliminated, replaced with the same model;

8, take a bucket of the appropriate amount of grease (high quality yellow dry oil) with gentle heat to melt (not hot), will detect over-bearing into the bucket to soak no bubbles overflow. Bearing grease to cool before removing residual grease less. After cooling remove grease angular contact ball bearings, grease residue quantity. Determine how many of the remaining amount of grease required.

9, with a soft cloth or tissue paper Thin section bearings‍ to wipe the outside of the bearing grease will FAG bearings fitted to the pulley undisturbed security, maintenance work is completed.

LYHY slewing ring bearings Angular contact ball bearings

Angular contact ball bearings: 7000C-type (α = 15 °), 7000AC type (α = 25 °) and 7000B (α = 40 °) of several types. This kind of bearing lock port on the outer ring, the inner and outer rings can not be separated in general, can withstand radial and axial joint load and axial load in one direction. Axial load capacity mobile crane bearing‍ from the contact angle, the contact angle is larger, the ability to withstand high axial loads. This kind of bearing can limit the axial displacement in one direction shaft or housing.

Higher speed limit contact ball bearings can support radial load and axial load can also be subject to pure axial load, axial load capacity by the contact angle and the contact angle increases with the increase.

Single row angular contact ball bearings

Single row angular contact ball bearings can withstand axial load in one direction, when the radial load, will cause additional axial force must be applied to the corresponding reverse load, miniature linear bearings‍ therefore, the kinds of bearings are generally used in pairs. Double row angular contact ball bearings can withstand greater radial load mainly radial and axial joint load and moment loads, it can limit the bi-axial displacement of shaft or housing.

slim ball bearing Angular contact ball bearings installed in pairs

Paired angular contact ball bearings can bear radial load mainly radial and axial joint load can also be subject to pure radial loads. Tandem configuration can only bear axial load in one direction, the other two configurations can withstand axial load in either direction. After installing preload interference, rings and balls in the axial pre-load condition, thereby enhancing the entire group as a single bearing support stiffness and rotational accuracy.

Back to back configuration, the post code Full complement cylindrical roller bearing‍ for the DB (eg 70000 / DB), back to back pairing separate line bearing load to the bearing axis. Can withstand the effect of axial load in both directions, but the load in each direction only by one bearing. Back to back mounted bearings provide a relatively high rigidity of the bearing arrangement, and can withstand the overturning moment.

Face configuration, the post code for the DF (eg 70000 / DF), paired face-load line bearing the confluence of the bearing axis. Can withstand the effect of axial load in both directions, but the load in each direction only by one bearing. This configuration is better paired back to back with high rigidity, and is not suitable to withstand the overturning moments. This configuration of the rigid and affordability overturning moment is better than DB configurations, bearings can withstand axial load;

Series configuration, post code for DT (eg 70000 / DT), when arranged in series, parallel to the load line, radial and axial loads evenly shared by the bearing. However, acting on the bearing set can only bear axial load in one direction. If the axial load acting on the opposite direction, or if there is a composite load, mobile crane bearing‍ it is necessary to increase a relatively tandem pair bearing adjustment third bearings. This configuration can also be a series of three or more bearings at the same support, but can only carry axial load in one direction. Generally, in order to balance, and to limit axial displacement of the shaft, to be installed at the other support in the other direction to withstand the axial load bearing.

thin section bearing Structural deformation types

Double row angular contact ball bearings can withstand the same time characterized by joint load radial and axial load, limiting the axial displacement of both axes. Compared with the two-way thrust ball bearings, these bearings speed limit is higher, the contact angle of 32 degrees, rigid, can withstand the high precision bearings‍ overturning moment, widely used in cars in the front wheel hub (some models also use the same size double row tapered roller bearings).

Structural deformation double row angular contact ball bearings, there are four:

Type A: 90mm outside diameter less than or equal to the standard design of the bearing. No ball gap, and therefore can withstand equal bi-axial load. Using lightweight glass fiber reinforced nylon 66 cage, bearing temperature rise is small.

Type A: 90mm outside diameter greater than the standard design of the bearing. Side of the ball gap, with z steel stamping cage or solid brass cage.

Type E: is to strengthen the structure, the side with filling slots that can hold more of the ball, so a higher carrying capacity.

Both sides with a dust cover type and sides Full complement cylindrical roller bearing‍ with a ring-type, A-type and E-type design design double row angular contact ball bearings with dust cover can be both sides of the (non-contact) or seals (contact). Sealed bearings are filled with a rust-proof lithium grease, generally between -30 degrees to 110 degrees operating temperature. Without re-lubrication during use, before installation is no longer heated.

LYHY slewing ring bearings Axial spherical roller bearings

Axial spherical roller bearings and spherical roller bearings Similarly, race raceway is consistent with the bearing center axis as the center point of the sphere, such as spherical roller bearing type, therefore, has a self-aligning feature of deflection and shaft concentricity less sensitive.

And sample other thrust bearing different single direction thrust ball bearing‍ type of bearing axial load capacity is very large, the axial load while also subject to certain radial load, but the radial load should not exceed 55% of the axial load.

As long as the load P and P0 does not exceed 0.05C0, and turn rotary axis, the bearings allow listed in the following table aligning angle.

Aligning bearing angular diameter series aligning bearing angular diameter series 200 Series 1 ° ~ 1.5 ° 300 Series 1.5 ° ~ 2 ° 400 Series 2 ° ~ 3 ° smaller value for larger bearings, and allows increased when the load aligning angle will decrease.

Generally use oil lubrication during use.

Thrust tapered roller bearings can withstand axial load, Thin section bearings‍ can limit the axial displacement of the bearing, it can be used as a one-way axial positioning. And thrust cylindrical roller bearings compared to the carrying capacity of a large, relatively small slide, but a lower speed limit.

slim ball bearing Bearing performance characteristics described

1, spherical roller bearing outer ring and housing bore bearings should not adopt an interference fit with the inner ring and the journal should not be too tight, requiring cross roller bearings‍ the use of the adjustment nut in the installation should be able to produce more flexible axial displacement. Spherical roller bearings because if the interference fit, easy to make changes in the contact angle of the bearing, resulting in uneven distribution of load bearing, causing a high temperature. Therefore, the installation with the kind of bearing outer ring and the journal and the bearing housing bore, the general should be able to thumb his hands just pushed into the journal and the bearing housing bore for the best.

2, for spherical roller bearings mounted axial agricultural bearings‍ clearance, the journal is available on the adjusting nut, washer and housing adjustment screw hole, or spring preload adjustment methods. The size of the axial clearance, and bearing installation layout, material from the bearing shaft and bearing between relevant, can be determined according to the working conditions. For high-load high speed spherical roller bearings, adjusting clearance, must consider the impact of temperature on the axial clearance, clearance will reduce the amount of the estimated temperature rise caused by account, that is, the axial travel to properly adjust the gap a little too big. For low speeds and withstand vibration bearings, no clearance should be taken to install, or preloaded installation. Its purpose is to make Spherical roller bearings and roller produce good contact load is evenly distributed, to prevent the rollers and raceways damaged by shock and vibration. high precision bearings‍ After adjustment, the size of the axial clearance with dial gauge test. The method is to first dial gauge fixed in the body or the bearing housing, so that the dial gauge against smooth contact surface of the shaft, the shaft axially pushed around, the maximum amount of the hands of the swing is the axial clearance values.

thin section bearing Tapered roller bearings

Tapered roller bearings mainly bear radial diameter, axial joint load. Load bearing capacity depends on the outer ring raceway angle, angle the greater carrying capacity. These bearings are separable bearings, according to the number of columns bearing rolling elements into single row, double row and mobile crane bearing‍ four row tapered roller bearings. Single row tapered roller bearing clearance to be user adjusted during installation; double row and four row tapered roller bearing clearance in the factory based on the given user requirements, users do not need to adjust.

Tapered roller bearings have tapered inner and outer ring raceways, tapered rollers are arranged between the two. All conical surface projection lines are a little get together with the bearing axis. This design makes tapered roller bearings particularly suitable for the accommodation of combined (radial and axial) loads. Most of axial load bearing capacity is determined by the contact angle α; greater the α angle, the higher the axial load capacity. crossed roller bearings‍ Angle size to calculate the coefficient e; e value, the greater the contact angle, the bearing axial load greater applicability.

Tapered roller bearings are usually separated type, that is with roller and cage assembly of components of the inner cone and cone outer (outer) installed separately.‍

LYHY slewing ring bearings Lubrication method

Bearing Maintenance: bearing cleaned up: Assembly nsk tapered roller bearings under the overhaul, the first recorded appearance of bearings, confirm the residual amount of lubricant, lubricant used after sampling review, wash bearings. The tapered roller bearings nsk full immersion is the slot machine lubricating bearings by shrouded brought up, and then back into the oil sump Gulu body should be slightly lower than the lowest place. cross roller bearings‍ Application of such a measure normally smooth grease -20 ~ 120 ℃, while on the positive is 150 ℃ low temperature applications arise from basic oil boiling too fast, run off and serious scenes, greatly extending the life bearing application number. As the clean up agent, generally use gasoline, kerosene. However, because the application of the mineral base oil, so that the kind of smooth and grease are being played on some biochemical indices close buckle rust and rust function outside. Non-break-type medium-sized ball bearings, the inner ring with one hand support level, wind around the outer ring to confirm whether smoothly. Because that kind smooth butter chosen delicate fiber, light melancholy filter to waste lithium thickener, application of mineral oil as the base oil, it is difficult to know the light outside the high-end bearing foot elevated vibration request. In order to Full complement cylindrical roller bearings‍ determine the assembly up nsk tapered roller bearings whether you can use to clean the bearing after being reviewed. Oil can be taken away due to repeated heat determine the bearing cool down, so this law applies to high speed bearing components. Law is suitable for high-speed, high-temperature lubrication of the bearing element. Piles of metal machine grid Xiaobian to introduce 1 bearings are bearing oil bath lubrication are the cause, the use of the amount of fat in the biggest kind of smooth high-speed wire rod roller bearings, accounting division with 70% fat content. With a high pressure oil pump through the nozzle onto the tapered roller bearings nsk, launched into the bearing oil flow into the tank through the other end of the bearing. 2 bath lubricated bearings drip lubricant bearing lubrication in general form, suitable for low speed bearing lubrication. Review raceway, Gulu surface, the surface morphology of cooperation, cage wear, the bearing clearance is added and there is a sense of proportion about the decline of precision damage, strange. Repeat 3 bearing lubrication Taper roller bearings‍ oil lubrication suitable for drip lubricant supply capacity was needed nsk tapered roller bearing elements, drip drop amount is generally advisable every 3-8 seconds, too much oil will cause the bearing to measure improved. Another benefit is a degree of non-inferior good pumping, either greasing machine still works fine greased are concise hard line. A bearing lubrication oil pump spray the filtered oil to the bearing element, after the nsk tapered roller bearing lubricant and then filtered using ice. 5 bearing spray lubrication expansion monotonous atmosphere confused by the formation of the lubricating oil mist sprayer, spray bearings, bearing cyclone may be invalid cool and prevent intrusion of impurities. Moreover, the smooth expensive grease can greatly increase profits nsk tapered roller bearings. When no difficulty on starting and running a positive momentum moment is -20 ℃ testing. When are bearing high-speed wind around Gulu body and cage also make progress commensurate with the high-shrouded atmosphere around the formation of cyclones, with the general form it is difficult to lubricate spherical roller bearing‍ the bearing lubricant sent, then you must use high-pressure jet spray lubricant in the form of to the bearing, the position of the nozzle should be placed is maintained between the inner ring and the place holder.

slim ball bearing Spherical roller bearings

Spherical roller bearings with two rollers, mainly bear radial load, but also can withstand axial load in either direction. A high radial load capacity, especially suitable for heavy work loads or vibration, but can not afford pure axial load. This kind of bearing outer ring raceway is spherical shape, so its mobile crane bearing‍ good self-aligning, can compensate concentricity error.

There are two symmetrical spherical roller, there is a common spherical outer ring raceway, and the bearing inner ring with two axis tilt angle of the raceway, aligning with good performance, when the axial force bent or install a different heart while still bearing the normal use, transfer concentric with the bearing size range varies, generally allowable aligning angle is 1 to 2.5 degrees, the larger the load bearing capacity of this type, in addition to radial loads outer bearing can withstand double-acting axial load, has good impact resistance, in general, spherical roller bearings allowed operating speed is low.

Spherical roller bearings under the roller-sectional shape into symmetrical spherical roller and spherical roller asymmetric shape of two different structures, high precision bearings‍ asymmetric spherical roller bearings are early products, the key is for the host service, new design when the host is rarely chosen symmetrical spherical roller bearings, internal structure has been completely improved design and parameter optimization, and early-aligning roller bearings produced compared to withstand greater axial loads, these bearings run lower temperature, it can be adapted to the requirements of high speed, according to the inner wall and used with or without a cage characteristics can be divided into two kinds of type C and CA, C-type bearing is no inner wall and the use of steel stamping cage, CA type bearing characteristics compared to both sides of the inner wall and the use of the car solid cage in order to improve the bearing lubrication, can provide users with an outer annular groove and three hole aligning roller bearings, with bearing post code / W33 said, can also be supplied with inner hole aligning roller bearings based on user requirements, in order to facilitate customer handling and replacement of bearings, but also provide the hole aligning tapered roller bearings, tapered bore, taper 1:12 later code-named K said that in order to meet specific user requirements are also available within 1:30 taper bearings, then set code for K30 tapered ferris wheel bearing‍ bore bearing locknuts are available directly mounted on the bearing cone journal, it can draw an adapter sleeve or withdrawal sleeve mounted on a cylindrical bearing journal. To ensure that the bearing at high speed centrifugal action to prevent harmful slip between the raceway and roller,

thin section bearing Thrust bearings thrust ball bearings and thrust into roller bearings

Thrust ball bearings and thrust ball bearings and thrust into angular contact ball bearings. Raceway washer by the band and the ball and cage components and the shaft with raceway ring called shaft washer, and the shell with raceway ring called seat bidirectional bearing and the shaft will be in the high precision bearings ring with one-way bearings can withstand axial load, two-way bearings can withstand axial load. appear before the installation of seat spherical bearings with aligning properties, can reduce installation impact of errors. such bearings are mainly used in automobile steering mechanism, the machine spindle.

Thrust into thrust cylindrical roller bearings roller bearings, spherical roller thrust bearings, thrust tapered roller bearings, thrust needle roller bearings.

Thrust cylindrical roller bearings are mainly used in oil drilling rig, made ​​of iron steel machinery.

Axial spherical roller bearings These bearings are reali slim bearings‍ mainly used in hydroelectric power, vertical motors, marine propeller shaft, crane, extrusion machines.

Tapered Roller Bearings Thrust Bearing these main purposes: one way: crane hooks, swivels oil rig bidirectional: rolling mill roll neck.

Thrust bearing assembly mainly axial load, its wide application. Although the thrust bearing installation operation is relatively simple, but the actual repair is still often an error occurs, the tight and loose ring ring bearing mounting location that is incorrect, the results of the bearing out of action, the journal will soon be worn. Retaining ring mounted on the end face of the stationary member, the mounting error. Tight inner ring and the journal for transition fit to drive when the shaft is rotated tight ring, and the end surface friction with the stationary element, mobile crane bearing‍ the axial force in the subject (Fx), it will appear larger than the inner diameter of the friction torque with the drag torque, resulting in tight ring and the shaft with face mandatory rotation, aggravated journal wear.