Shaft, housing and bearing cooperation

Source: Bearing network time: 2013-02-17

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1. When the shaft and the housing require the shaft and the casing is not accurate; the shaft accepts the influence; the required function cannot be carried out. For example, if the device has some shoulders, the accuracy is not good; the inner and outer rings may be relatively skewed. In addition to the increase of stress gathering; reduce the fatigue life of the bearing; more severe will lead to damage to the cage; sintering.
2. The cooperation between the shaft, the housing and the bearing for the cooperation of the motor and the shaft is usually k5 or k6. The common cooperation between the bearing and the outer casing is usually K7. The precision of the shaft and the casing cooperated with the 6309 bearing is as follows:
Roundness of the shaft: 4 ~ 7Î¼m, cylindricity: 4 ~ 7Î¼m, the shoulder of the bounce: 4Î¼m
Shell roundness public service: 7 ~ 11Î¼m, cylindricity: 7 ~ 11Î¼m, shoulder bounce public service: 4 ~ 7Î¼m
The chamfer of the shaft and the outer casing shall not be coherent with the chamfer of the bearing; the radius of the chamfer shall not exceed the minimum value of the chamfer dimension of the bearing.

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