What aspects should be considered in the selection of rolling bearings?

There are many types of rolling bearings and a wide range of sizes. In order to select the most suitable bearing for the design purpose, it is necessary to integrate the mechanical conditions, the performance requirements of the bearing, the specifications of the bearing, and the market and economy. analysis.

Since the bearing diameter is generally determined first, then the bearing is selected first, and the bearing type is preliminarily determined based on the bearing inner diameter and considering the bearing installation space and configuration mode. Secondly, the analysis and comparison of the "mechanical required bearing life" and "press Bearing life calculated by bearing load "determines the size of the bearing; finally, it is necessary to determine the internal structure of the bearing such as accuracy level, internal clearance, cage, lubricant, etc.

The general steps for selection are:

1. Determination of bearing type and configuration. (Reference factors are: bearing installation space; bearing load size, direction and nature; speed; rotation accuracy; noise and friction torque; rigidity; relative inclination of inner and outer rings; installation and disassembly; bearing configuration; Sex and economy).

2. Determination of bearing size. (mechanical required bearing life; equivalent dynamic load; equivalent static load; speed; main bearing size; basic dynamic load rating; basic static load rating; allowable axial load).

3. Determination of the accuracy level. (rotation accuracy; noise and friction torque; speed; bearing accuracy).

4, with the internal clearance. (The size and nature of the load; the temperature at the time of operation; the material, size and precision of the shaft and the outer casing; the fit; the temperature difference between the inner and outer rings; the rotational speed; the preload; the bearing accuracy; the internal clearance of the bearing).

5, cage material and type. (speed; noise).

6. Special environment response measures. (Medium conditions, such as temperature, seawater, vacuum, pharmaceuticals, dust, gas, magnetic fields, etc.; special materials; special heat treatment; special surface treatment; lubricants).

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27 reasons why the bearing is ringing

    After a long-term summary by the technicians, there are 27 reasons for the bearing to sound. There may be many that we have not encountered before, and will be slowly replenished later.
    1. The bearing is mixed with impurities such as sand or carbon particles to act as an abrasive.
    2. The bearing is mixed with moisture, acid or paint and other dirt, which acts as a corrosive effect;
    3. The clearance of the bearing is too small (the selection is not appropriate);
    4. The lubricating oil or grease type is incorrectly selected;
    5. Insufficient lubrication (oil level is too low, oil or grease leaks through the seal);
    6. The bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is not twisted straight);
    7. The horn of the bottom of the bearing housing is not flat (resulting in deformation of the seat hole or even cracks in the bearing housing);
    8. There are debris in the bearing housing hole (residues, dust particles, etc.);
    9. The seal is eccentric (wearing adjacent parts and rubbing);
    10. The bearing is subjected to additional loads (the bearing is axially tightened, or there are two fixed end bearings on one shaft);
    11. The thermal elongation of the shaft is too large (the bearing is subjected to static and indeterminate axial additional load);
    12. The clearance of the bearing is too small, and the rotation is too tight (the tightening sleeve is too tight);
    13. The bearing is noisy (caused by the end face of the roller or the slip of the steel ball);
    14. The bearing and the shaft are too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened);
    15. The shoulder is too large (touching the seal of the bearing and rubbing);
    16. The shoulder of the seat hole is too large (the seal of the bearing is twisted);
    17. The gap of the labyrinth seal is too small (friction with the shaft);
    18. The teeth of the lock washer are bent (wearing the bearing and rubbing);
    19. The position of the oil ring is not suitable (the flange cover is encountered and friction occurs);
    20. There is a pressure pit on the steel ball or roller (caused by hammering the bearing during installation);

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