What thin section bearing lubrication is intended to join

thin section bearing is a rolling bearing, use the time to reduce internal friction and wear of the bearing to prevent burning stick, you need to add the lubricating effect, adding the purpose of lubrication to ①reduce friction and wear ② in the ring, and the rolling elements constituting the bearing retainer mutual contact portions to prevent the metal contact, reducing friction, wear ③ fatigue life of rolling fatigue life, in rotation, the rolling contact surfaces oiled, will be extended. Conversely, low oil viscosity, poor lubricating film
thickness is shortened discharge of frictional heat, cooling ④ circulating oiling method, etc. can be discharged oil heat generated by friction or heat coming from the external cooling. Prevent bearing overheating and prevent oil itself aging ⑤ to prevent dust and debris inside the bearing, or prevent rust, corrosion effect.

The composition of the ball and roller combined bearing

The work of ball and roller combined bearing is sliding friction; The rolling friction is mainly depends on the size of the manufacturing accuracy; And the size of the sliding bearing friction is mainly depends on the slip plane of the bearing material. thin section bearing generally face all have self-lubricating function; Sliding bearing according to the material divided into sliding bearing and sliding bearing metal, not of metal.

Non-metallic sliding bearing mainly plastic bearings, plastic bearings are generally USES the engineering plastic with good performance comparison; More professional manufacturers generally have self-lubricating engineering plastics modification technology, through the fibers, special lubricants, glass beads and so on to self-lubrication engineering plastics modification to enhance performance, and then use modified plastics by injection molding processing into self-lubricating plastic bearings.

Metal sliding bearing is currently the most used three layer composite bearings, the bearings are generally based on carbon steel substrate, through sintering technology in steel plate on a layer of spherical copper powder sintered first, and then sintering layer on copper powder layer is about 0.03 mm PTFE lubricant; One intermediate layer spherical copper powder main effect is to enhance the bonding strength between the steel plate with PTFE, at work, of course, also have certain bearing and lubrication effect.

The establishment of flexible supporting thin angular contact bearing model

According to the thin wall of an aeroengine with angular contact ball bearing AC71907 as an example to analyze.

  Bearing parameters, outer diameter is 55mm, the outer ring raceway diameter is 50.586mm, the inner diameter is 35mm, the inner ring raceway diameter is 39.423mm, the ball diameter 5.556mm, the ball number 15, ( thin wall bearings )the initial contact angle of 25 deg..

  Between the bearing seat and the bearing outer ring is in interference fit, with the gap of m in 0-15um.

Thin wall bearing in recent years

In recent years, with the development of finite element, boundary element numerical calculation method, to consider the ferrule deformation and boundary condition of load distribution of rolling mill bearing is possible.

  This paper established a flexible support thin angular contact ball bearing finite element analysis of the load distribution model, considering the ferrule deformation and boundary conditions on the bearing load distribution, the influence law of life and stiffness properties of the ANSYS tutorial,（thin wall bearings ）and the calculated results of the finite element method and quasi dynamic method and the experimental results are compared.

Thin wall bearing and aero engine

For some special rolling mill bearing , such as aviation engine in order to reduce the weight and the use of thin wall bearing , fit for a gap between the bearing outer ring and bearing seat hole case, because the thin wall ring rigidity is small, with the accuracy of both will have influence on the internal load distribution of bearing, displacement calculation of load distribution at this time ，

  When considering only contact the deformation is the displacement of Hertz is not enough, must consider the bending deformation after loading effect on the load distribution of the inner ring and the outer ring, radar bearing ， which is the so-called flexible supporting bearing load distribution problem, which makes the theoretical solution increased the degree of difficulty.

Thin wall bearing ANSYS tutorial

Load distribution of rolling mill bearing in mechanical basic research is the rolling bearing determines the performance and the service life of bearing. The calculation of the general working conditions of rolling bearing load distribution,thin section bearing often do not consider the influence of coordination and elastic deformation of the outer ring and the bearing factors.

  Jones based on Hertz contact theory and the rigid ferrule hypothesis is proposed on the quasi dynamic method, slewing ring bearings used to calculate the rolling characteristics of bearing load distribution. This treatment results and actual situation although there are differences, but because the calculation method is simple, is still widely used in practical engineering ANSYS tutorial.

Modeling of thin-wall angular contact ball bearings

Because the need analysis of multiple change, load structure parameters on the performance of thin wall bearings, so in order to reduce repeated work analysis in modeling software ANSYS, design language in this paper using ANSYS finite element software provides the APDL parameter,

  the command to write parametric modeling of thin-wall angular contact ball bearing component of the flow, simplifies the process of repetition modeling,
and its optimal design and the two development laid a good.

The thin-wall angular contact ball bearings

In order to accurately calculate the flexible bearing load distribution, taking the outer ring isolated point supported thin-walled angular contact ball bearing for example, the establishment of a three-dimensional finite element analysis model, considering the outer ring after loading of bending deformation of the rolling body effect of load distribution, thin section bearing

  Analysis under different working conditions of bearing load distribution, change law of life and stiffness properties, and the calculated results of the finite element method and quasi dynamic method and the experimental results were analyzed and compared, ANSYS tutorial.

  The results show that,radar bearing ， the finite element method calculation results and experimental results are more close.

Slewing bearings used in construction machinery

Slewing bearings are widely used thin section bearing , engineering machinery is the most extensive application ofslewing bearing is initially applied places, such as the earth moving machinery, excavators( excavator bearing ),disintegrating machine, stacker reclaimer, flat machine, roller, compaction machine, drillingmachine, boring machine etc.. There are other,

• Concrete Machinery, concrete pump truck, concrete mixer cloth rod integrated machine, belt conveyor
• Feeding Machinery, disc feeder, sand mixing machine
• Crane, wheeled crane, crawler crane, portal crane, tower crane, fork type crane, crane, crane with Longmen
• Foundation Processing Machinery, percussive reverse circulation drill, rotary drilling rig, percussiverotary drill, rotary drilling rig, reverse circulation rotary drilling rig( rotary bearing ), normal circulation rotary drilling rig, long spiral engineering drilling machine, submersible drilling machine, static pressure pilemachine, piling machine
• Engineering Ship,dredger,ship loader bearing
• Special Purpose Vehicle,bridge detection vehicle, fire truck, window cleaning machine, plate girder transport vehicle, aerial vehicles, self-propelled aerial work platform
• Light Industry Machinery, beverage machinery, bottle blowing machine, packing machine, filling machine, rotary bottle arranging machine, injection molding machine,The ship crane.

Four series of slewing ring bearings

Slewing ring bearings, a comprehensive load to bear a large bearings,can bear larger axial and radial load and overturning moment at the same time. Slewing ring bearings are generally installed with a hole, internal or external gear lubricants hole and sealing devices, which enable mainframe, design guide is simple, compact structure, easy maintenance.

  Slewing ring bearings have four series, four point contact ball bearing of no tooth type, external gear and the internal gear type ,double row angular contact bearing ,cross cylindrical roller bearing, crossed tapered roller bearing and three row cylindrical roller combined bearing .

  Four point contact ball slewing bearings have higher static load capacity, cross cylinder the roller has a higher dynamic load capability, crossed tapered roller bearing preloaded can make bearing with large supporting rigidity and rotation accuracy, three row cylindrical roller combined bearings due to highly improving the carrying capacity of the bearings, a variety of power by different raceway bearing, so in the same under the condition of stress, the bearing diameter can be greatly reduced.Thus the characteristic make  host more compact is a kind of slewing bearing of high bearing capacity.

  Slewing ring bearings are widely used for hoisting machinery, mining machinery, construction machinery, port machinery, ship machinery ,large rotary device, high precision radar mechanical and missile launchers on the equipment. At the same time,  design according to the specific requirements of users,development and production of various special structure of slewing bearing.

New machinery component

Slewing ring bearings are new type of mechanical parts for nearly forty years gradually on the rise in the world, which have inner and outer ring, rolling body composition, etc. at present, Chinese shaping slewing bearing production, mainly in the early 80 by the Ministry of machinery industry specified Tianjin Engineering Machinery Research Institute organized to introduce the design and manufacturing technology of the former Federal Republic of Germany Rothe company Erde.

  Released in December 20, 1984, the Ministry of machinery industry standard of the people's Republic of China， JB/2300-84 Rotary Bearing Types, Basic Parameters and Technical Requirements, mainly by the Ministry of machinery and electronics industry of Tianjin Engineering Machinery Research Institute, Xuzhou Hailin slewing ring factory is responsible for drafting, later the country again in 1991 issued a construction machinery standards, JB36.1-36.3-91, in 1999 and 2011 has issued new machinery industry standard JB/2300-1999 and JB/2300-2011 .

The grid division of thin section angular contact bearings

  In carries on the grid division of thin section angular contact ball crossed roller bearings , the possible contact parts need unit size control slewing gear , using 5 units of the adjacent node distance of different mesh. Finite element model graph after mesh partitioning as follows.

Simplified model of thin section angular contact bearings

The simplified model adopt for 2 ball contact model, the smaller ball diameter size is 3.175mm, and the actual cross roller bearings steel ball size consistent in size.

  Larger ball thin section bearings diameter  size is 10mm. load is simplified as concentrated load, effect of point in the ball at the top of the center, the size of the load is 100N, so it can calculate 0 ~ 100N contact size and contact stress of bearing beyond load effect .

  The ball material is 9Cr18 stainless steel. In order to reduce the analysis time and improve the efficiency of analysis, the ANSYS analysis method was used to analyze the axial symmetry.

Waffle radial sliding bearing

Radial sliding bearing has three kinds of typical structure, respectively is the waffle radial sliding bearing, the radial sliding bearing and  self-aligning radial sliding bearing.

  Waffle sliding bearing is composed of a bearing seat,  bearing cover, split bearing and stud etc.. Subdivision surface often artist stepped, in order to prevent lateral dislocation of neutralization. The bearing cover is arranged at the upper part of the threaded hole, for the installation of the oil cup. Bush is split, usually loaded by the lower bearing shell bearing .

  In order to save precious metals or other needs, often cast a layer of bearing liner  on the inner surface of  the bush . In the bearing inner wall of non load bearing area open oil tank.Oil through the oil hole and an oil slot into the bearing clearance.

  Bearing section  and the load direction had better approximately vertical,though most bearing subdivision surface is horizontal (also made into inclined).

 

Waffle radial sliding bearing assembly and disassembly is convenient, and the bearing wear can adjust bearing clearance with the gasket thickness of reducing the split surface .

Lubricated bearings

Commonly used lubricants have oil, water, air and other fluids and graphite, MoS2 Solid, according to the applications and requirements of bearing . Using liquid as radial bearing lubricant lubrication film thickness according to the divided into thin film lubrication bearing and thick film lubrication bearing.

  In the thick film lubrication bearing according to the formation mechanism of thick film is divided into liquid dynamic pressure radial bearing and the liquid static pressure radial bearing.

What manufacture bearing bush?

Bearing bush  reduced with manufacturing of friction good sliding bearing materials, including metal material,such as copper alloy, aluminum alloy and Babbitt.And non metal materials ,such as plastics, graphite, rubber and wood.

  Some antifriction metal material strength is low ,such as Babbitt. Cast a layer only in the bearing surface of materials with higher strength,which called bearing lining. Support bearing lining part called bearing backing, used to be made by mild steel, cast iron or bronze.

  In order to further improve the bearing lining surface properties, plate a thin layer of metal  on the surface of reducing friction of the better ,such as indium.

  It is composed of different  multilayer metal material  called multi-layer metal bush. Bearing inner hole shape is basically not affected by the shape of the bearing seat hole called thick walled bearing.

  Inner hole shape depends mainly on the bearing seat hole shape called a thin wall bearing bush. Thin wall bearing is widely used in the machine of internal combustion engine, air compressor with mass production.

Four structure types of radial sliding bearing

Radial sliding bearing can divided into splittype, integral type, flange type ,self position type and other types.

  Bearing split bearing cover can be opened, so as to be loaded axle neck, bearing wear for easy adjustment of the bearing clearance. Integral type bearing  has simple structure, but must be loaded from one end of the shaft neck, unable to adjust the gap after wear.

  Flange bearing mounting surface is perpendicular to the bearing center line.Self position type bearing can automatically adjust the axis, in order to adapt to the deformation of shaft deflection.

  Radial sliding bearing bore diameter called bearing diameter. The axial size of Bush called bearing width. The width of bearing and bearing diameter is called
Width diameter ratio, generally 0.4 ~ 1.5.

  In order to reduce the axial size (such as in an internal combustion engine) ,sometimes taken to 0.25. Width diameter ratio on the bearing performance have a great effect.

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.

Grease of thin section bearing

At present, more and more refined using miniature bearing equipment, the grease the bearings must have no the following function:
(1) the operation life with no and thin section bearing the same, try to delay the maintenance cycle, reduce downtime, advance in labor productivity.
(2) in the high speed to low motor temperature rise, not oil, thereby reducing power consumption, to protect the motor.
(3) the net content control is the inevitable standard, the maximum reduction of equipment noise pollution.
(4) is the ultra low temperature work starting and operating conditions to ensure the bearing spiritual, common problems of bearing. The minimum guarantee the output power.
Needle Roller Bearing cleaning, cleaning rough and fine cleaning, placed in a container, metal mesh on the bottom first, make the bearing does not directly contact the container dirt. Rough cleaning, if you rotate the bearings with dirt, can damage the bearings of rolling surface, should be noticed. In the crude oil washing, use brush put to grease, adhesive material, generally clean, to wash.