The adjustment of timken bearings is different from other cylindrical bore bearings. The internal clearance of single row angular contact ball timken bearings and tapered roller bearings can only be established when one bearing is adjusted for the other. Usually these bearings are paired back-to-back or face-to-face, and one of the bearing rings is axially displaced until the selected clearance or preload is reached. The choice of clearance or preload depends on the performance and operating conditions of the bearing layout. For details on bearing preload, see the section 'Bearing Preload Control'. Therefore, the following recommendations only deal with the internal clearance adjustment of the bearing layout of angular contact ball bearings and tapered roller bearings. The proper clearance value must be reached during installation, which can be determined according to the load and operating temperature of the bearing. Depending on the size and layout of the bearing, the material of the shaft and the bearing housing, and the distance between the two bearings, the initial clearance obtained during installation may become smaller or larger in actual operation. For example, the temperature difference and thermal expansion of the inner and outer rings will cause the reduction of the clearance during operation, so the initial clearance must be quite large in order to avoid the deformation of the timken bearing and its adverse consequences.　　 Since there is a clear relationship between the radial and axial internal clearances of angular contact ball bearings and tapered roller bearings, only one value needs to be specified. Generally, the internal clearance in the axial direction is specified. The specified value can then be obtained from the zero clearance state by the following methods: loosen or tighten the nut on the shaft or the screw ring in the box shaft hole, or insert a calibrated washer between a bearing ring and its support Or gasket. The actual method used to adjust the clearance and measure the set clearance depends on the number of bearings to be installed.　　 For example, one method is to use a dial indicator mounted on the hub to check the set axial clearance of the hub bearing layout. It is important that when adjusting the tapered roller timken bearing and measuring the clearance, the shaft or bearing housing needs to rotate several times in different directions to ensure proper contact between the end of the ball and the leading edge on the inner ring. If the contact is improper, the measurement result is not accurate, and the expected adjustment purpose cannot be achieved. [China Bearing Network]