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1. What is bearing preload

Bearing pre-tightening refers to trying to apply a certain pressing force between the inner and outer rings when installing the bearing, so that the contact between the rolling elements and the inner and outer rings produces a certain initial deformation and is in a compressed state.

2. What are the pre-tightening methods of TIMKEN bearings

There are two main methods for TIMKEN bearing preload: positioning preload and constant pressure preload.

(1) Positioning preload

Positioning preload refers to the axial relative position of the combined bearing, which will not change during use. The various methods are as follows:

a. In order to apply preload, it is a method used after tightening the combined bearing with the width difference or the axial clearance adjusted in advance.

b. Use spacers or spacers with adjusted dimensions to preload the bearing.

c. The method of tightening the screw and nut that can adjust the axial clearance. In this case, in order to obtain an appropriate preload, it is necessary to measure the starting friction torque while adjusting. However, this method is difficult to control the preload, and the bearing may tilt, so it is not recommended for machine tool spindles that require high precision.

(2) Constant pressure preload

Constant pressure preloading is a method of applying proper preloading to the bearing through cylindrical springs and butterfly springs. Even if the relative position of the bearing changes during use, the preload can be kept basically constant. Usually used in high-speed rotating angular contact bearings pairing.