1, The vibration caused by the bearing manufacturing error

Inner and outer ring raceway and the rolling surface of the rolling bearing in the circumferential direction have different degrees of wavy machining marks - waviness. This is an extremely important factors bearing vibration and noise induced by the rotational axis of the shaft occurred eccentric motion. Since the vibration waviness formed by machining marks caused, no radial clearance for bearings or other bearings other than ball bearing axial load is applied also occur, in addition to the raceway waviness of many wave number bearings when subjected to radial load will occur.

Due to the above-described rolling bearing surface waviness caused by manufacturing considerations, wish to control its impact on bearing vibration, and only by improving the rolling surface machining accuracy and reduce the raceway surface shape to solve. Modern level of technology, this technology has made progress, but it can not completely eliminate the influence of the wave pattern on the bearing Station East noise.

Also to be noted is not only a factor in the manufacturing of bearings, as well as installation of the factors bearing and the shaft bearing and rigid conditions, are likely to make the raceway surface of the bearing to produce waviness, their impact is often greater than the impact of manufacturing considerations, which It is bearing the user must solve the problem.

2 And the shaft and housing bore shape and position accuracy

Bad shape and position accuracy of the shaft and housing bore, after its bearing mounting ring deflection occurs, the vibration caused by low-frequency vibration so than the inherent rolling bearing surface waviness caused bigger.

(1) Of the ferrule and positioning abutments are not perpendicular impact

When locating bearing ring and install parts of the shoulder block is not vertical, as it is moving in the circumferential direction of fit, distorting the ring, the raceway becomes oval, its roundness error about the gap between the collar and the mounting surface twice.

(2) The impact of the mounting surface geometric errors

Bearing raceway roundness usually about 2μm, such as the installation surface shape error is greater than 2μm- generally having from 2 to 10 waves waviness, when the bearing ring with interference fit onto this surface, raceway there may be 2 to 10 conform waviness, while higher than the operating speed of 2 to 10 times the vibration occurs.

If there is a tight fit splines or keys near the level of the journal bearing is installed, it may lead to bearing raceways waviness occurred. The mounting surface in the axial direction or not straight abutments fillet radius is too large, it will have a similar ferrule is similar to the deformation caused by vibration and noise. Therefore, as in the test installation detected on the surface of the above, it must be repaired or exchange quality desirable mating parts.