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Sliding bearing seat noise inspection judgment for maintenance

Sliding bearing seat noise inspection judgment for maintenance


Carefully check the state of raceway surface, rolling surface and mating surface, the wear of the cage, the increase of clearance of the sliding bearing seat, and whether there is any damage or abnormality related to the decrease of dimensional accuracy.Non-detached small ball bearings, with one hand will support the inner ring horizontal, rotating the outer ring to confirm whether smooth. 

Large bearings can not be rotated by hand, pay attention to check the appearance of rolling body, raceway surface, cage, retaining surface, etc., the higher the importance of the bearing, the more careful inspection. 

The judgment of whether the bearing can be reused is made by considering the degree of bearing damage, mechanical properties, importance, operating conditions and the period up to the next maintenance.However, if there are the following defects can not be used.The bearings must be replaced. 

Although the noise caused by the manufacturing factors of sliding bearing seat is essentially caused by manufacturing error, it is still related to the selection of lubricant, the installation condition of bearing, the accuracy state of shaft and bearing seat.This noise is further divided into cage sound and vibration sound as follows:

(1) cage sound and its control method cage sound refers to the periodic vibration and noise caused by the impact of the cage with severe vibration and rolling body, which is easy to appear when the cage is loose in the pocket and the friction is large.This noise occurs mainly in ball bearings and bearings, and punching cage and entities cage will occur, when the use of grease or oil lubrication will happen, but when bad lubrication or lubricant used, big radial clearance, outer torque under load, and keep the bad frame structure and the precision is not high, the more likely to occur, serious when maintains a web or rivet head suddenly fracture. 

Methods of controlling cage noise and vibration are as follows.Use lubricants with good lubrication performance;Reduce bearing mounting errors;The radial clearance of the compressed bearing may be properly pretightened in the axial direction, and the sliding bearing seat with a cage of good precision and reasonable structure should be selected, or the bearing with a cage that is firm and not worn should be replaced. 

(2) vibration striation sound and its control method vibration striation sound is the noise directly related to the ripple degree of the sliding bearing seat 352/ rolling surface, which is a pure tone noise. For a constant rotating speed, its frequency is unchanged, while for a changing rotating speed, its frequency is also changed accordingly.

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