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.