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Mounting method of set screw assembly of seated bearing

by:JNSN     2021-12-17
The biggest feature of the seated rolling bearing is its easy installation and use. However, there is a risk of early damage to the seated bearing if it is installed or used incorrectly. Therefore, in order to take advantage of the original performance of the seated rolling bearing, it must be used and installed correctly. Installation of the set with stop screw When the bearing is installed on the shaft by the stop screw, it is enough to tighten the two stop screws on the inner ring of the bearing with the specified torque. However, in applications where there are vibrations and shocks, in applications where forward and reverse rotations are used, and applications where starting and stopping are frequently repeated, the surface of the shaft contacted by the stop screw must be machined into a flat groove with a file (Figure 14.1) Or drill holes (Figure 14.2). Therefore, the tightening effect of the set screw is greatly increased. In applications where there is a large axial load and intense vibration, a stepped shaft should be used, and the inner ring of the bearing should be tightened with a nut (Figure 14.3). For the dimensions of the stepped shaft, please refer to [9 Shaft and Base Design]. Seated rolling bearings use double-point set screws with good shaft tightening performance as the standard, but set screws suitable for various applications and conditions are also available (refer to Table 14.1). The installation process of a seated rolling bearing with a set screw is shown below. (1) Check whether the rigidity of the base, the flatness of the mounting surface, and the dimensional tolerance of the shaft are qualified. In addition, check whether the shaft has any problems such as bending, scratches, burrs, etc. (2) Confirm that the tip of the set screw is not exposed from the inner diameter surface of the bearing. (3) Insert the seated bearing into the shaft and place it in the desired position. When the interference fit is installed on the shaft, the following methods are used. Use a press to press the seated bearing onto the shaft, cool the shaft for shrink fit, and heat the seated bearing with an air bath (below 100°C) for hot sleeve installation, etc. Avoid using a hammer to hit the side of the bearing inner ring to press into the shaft. (4) Set the bearing with seat at the predetermined position of the base and fix it with bolts (Figure 14.4). Use a torque wrench to tighten the mounting bolts of the bearing box with the specified torque. Please refer to Appendix 3 at the end of the volume for the tightening torque of the mounting bolts.
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