Calculation of the needle roller bearing radial clearance of tone

Self-angular contact bearing‍ should ensure the outer spherical raceway and 

roller and raceway ask radial clearance at the contact line in the 

direction of the supporting, the radial clearance. Effect of self-aligning 

roller bearing radial clearance C, the main factors are: outer ring 

spherical Lang was D.. Inner ring diameter

Distance of two roller and roller contact by diagonal ask. The maximum 

diameter of D and the spherical roller

What is different. Spherical roller bearings supporting the identification 

process, the outer ring spherical raceway diameter deviation and the inner 

ring two most road diagonal distance deviation measurement and centripetal 

bearing the general differences. Measurement of packet and Zhu spherical 

raceway diameter deviation is generally performed by D924, bore dial 

indicator instrument; measurement packets in which two rolling deviation 

road diagonal distance is quite difficult. There are two methods used at 

present: don't choose an approximate diagonal distance measurement method, 

another is the method of measuring diameter of roll.

Structure self-aligning roller bearing is complex, many factors affect the 

radial clearance. Only by thrust roller bearing‍ grouping calculation matching is not guaranteed 

to pass the radial internal clearance of the bearing. This kind of bearing 

must be clearance in the matching test for the feast. Matching efficiency 

can reach the higher matching ginseng powder - revised. Aligning roller on 

the radial travel clothes measuring bearing commonly used in removing. At 

present, most manufacturers use 12 measurement device and plug K by way of.‍

Fatigue life test

Fatigue life test is to maximize the full lubrication abrasion factor inhibiting the bearing load and speed, the enhancement to an enhanced fatigue life test method for outstanding bearing fatigue factors.

The calculation and test of fatigue life of slim ball bearing fatigue life is complementary, the two results are corresponding enough. But in reality, such as for each specific occasions, all selected Boying bearing a sufficient number of life test, to verify the selected bearing is suitable or not, this is very big in the economy, time and amount of labor, so the life test of automotive bearings only is used in a very necessary or important case, in most cases, the standard life calculation method to estimate the service life of the bearings, with a sufficient degree of dependency. To predict the fatigue life of bearing, determining the remaining life, need to understand the bearing fatigue all the failure phenomenon, so it will take a long time. However, because the rolling fatigue fatigue at the contact point under compressive stress occurs, to achieve the damage will occur great change of materials. Therefore, in addition to extend prior to material changes in surface cracked, raceway suffer chemical effect, crack cases, detection of material 

changes may judge the vehicle linear ball bearing fatigue. The main reason is the defect of bearing fault off the overload two elements. When the load across the material strength and the ormation of broken parts called overload fracture. The reason is mainly from the sudden overload machine fault or install. Are defects cause fracture can be bearing parts of the micro cracks, shrinkage, bubbles, large foreign things, organizations and local overheating burn defect is shock overload or violent vibration, known as the defect fracture. 

It should be noted that, automobile bearing is process, the materials into the factory inspection, casting and heat treatment quality control, process control and instrument for the precise analysis of the defects can be through with no, then must still strengthen control.

But in general, the failure of most overload bearing fracture usually ‍‍

Crossed roller bearing assembly points and quality measures

Thin-walled cross cross roller bearings according to its structure, the assembly stage needs to grasp the bearing clearance control, rotary accuracy and stability of 3 points, cross 

roller bearings belong to special bearings with high precision, is mainly used in CNC machine, robot arm, as well as medical and military equipment, which are double row roller 

in a 45 degree tilt angle roll cross distribution channel, can maintain high rigidity on the roller and raceway contact line, but also because of a 45 degree tilt angle raceway 

can be uniformly load of axial and radial bearing, perfect overturning or torsional moment; in addition, cross roller bearings with negative clearance design and pre tight, can 

high rigidity bearing guarantee (compared with traditional models, rigid increase 3~4 times) and high precision, cross roller bearings precision Luoyang Boying bearing is in P5 

above, basic accuracy of P4, P2, belongs to high precision bearing:

1 crossed roller bearing clearance control bearing production processes in the two process to ensure the bearing clearance, a bearing end grinding, roller bearing sleeve so need 

beforehand medium size of test equipment, test equipment with rotary bearing is smooth, the negative clearance has a slight pressing feeling, can ensure the roller and the 

raceway with clearance at around 0.01mm, preparing for the next assembly; second procedures for fitting test equipment, the bearing does not install the isolation block or 

holder of test equipment, there are 5 groups of roller for choice, according to the assembly member feel and a dial indicator measuring judgment clearance is required, if don't 

be by replacing the roller and raceway grinding to finish the match, this method can also be used in the production of the turntable bearing YRT, is commonly used in bearing 

production method, just cross angular contact ball bearing are precision bearing, clearance requires precise control;

2 rotary accuracy and stability control; through production practice experience for many years we know, rotary precision cross roller bearings and YRT turntable bearing mainly, 

and the raceway quality and deformation, therefore, all bearing before shipment is half finished product assembly, prevent long after placing deformation, and thin-walled cross 

miniature ball bearings in the grinding time by tempering 2 times treatment, ensure the material stress release caused by deformation of the risk to a minimum; the actual assembly of a 

rotary impeded, the bearing cleaning, check whether there is damage raceway, then the accuracy of roundness and flatness.

Measuring to ensure the bearing quality.‍

Crossed roller bearing internal clearance choice points

The so-called bearing internal clearance, which are not installed on the bearing on the shaft or bearing box, a fixing the inner or outer, then that is not a fixed one measuring 

radial or axial movement of the mobile. According to the movement direction, radial clearance and axial clearance can be. Crossed roller bearing internal clearance choice points 

called bearing internal clearance, which are not installed on the bearing on the shaft or bearing box, a fixing the inner or outer, then that is not a party to the fixed

The amount of axial movement of the mobile or. According to the movement direction, can be divided into radial clearance and axial clearance. On the measurement of bearing 

clearance in the interior, in order to make the measurement value is stable, general test load was applied in the ring. Therefore, the test value than the actual clearance 

value, namely one more test applied load and elastic deformation. Bearing clearance operation, because the bearing with inner and outer rings and cause temperature, than the 

initial clearance of small. Running clearance and the flange bearing life, Wen Sheng, vibration and noise are closely related, so it must be set to the best state. Turntable bearings 

theoretically, bearing in operation, with negative clearance operation, the maximum bearing life. But it is very difficult to maintain the best clearance. With the change of the 

conditions of use, the negative clearance of bearings will increase, leading to the bearing life is significantly reduced or have a fever. Therefore, the initial clearance of ring bearing is slightly greater than zero.

ferris wheel bearing Throughout the development process of China's bearing industry

Throughout the development process of China's bearing industry, although the national macro-control continues to drive policy, to achieve a sustainable growth in the industrial economy, but in the back of rapid economic growth, is still in the development stage of China's bearing industry technology still needs improvement, Products also need to expand the market.
China as an important hub spindle bearing  net horizontal development of China's bearing industry, the strategic opportunities of China's bearing industry development, promotion and guiding its advantages based network platform, and constantly optimize the industrial structure, and industry information, show information, product supply and demand other specialized modules to support and accelerate wind power bearing the pace of industry innovation and technological innovation system.
China Bearing Network will explore the road of sustainable development of China's bearing industry as the goal, from a professional point of view of the market, anatomical markets to assess the situation and boost the strategic adjustment of China's bearing industry the perfect transition from the development stage to maturity.