precision spindle bearings clearance

precision spindle bearings clearance is the inner ring, outer ring, rolling body gap amount between the. That is the inner or outer ring of a fixed amount of the other party, move up and down or left direction. The displacement of radial direction, axial direction, are called the radial clearance, axial clearance.
Selection of bearing clearance, has great influence on the mechanical operation accuracy, service life of the bearing vibration and noise, friction resistance, thin section angular contact bearings etc.. Clearance at the operating temperature of the bearing clearance and mounted before the post (clearance) are different, the axial positioning accuracy, the working clearance should be as small as possible.
Selection of bearing clearance, must fully consider the following several main factors:
1) change with the bearing and the shaft and housing bore tightness will result in bearing clearance value. In general, diffusion tensor bearing inner ring raceway can approximate to the interference fit between the 80%, and the contraction of the outer ring can be roughly constant interference for its 70% (prerequisite: solid steel shaft, steel Angular contact ball bearings wall normal thickness).
2) bearing in operation process, because the radiation condition of the shaft and the housing and different coefficients of expansion, change will lead to clearance value.