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Installation of seated bearing fastener assembly

by:JNSN     2021-12-22
The tapered bore bearing is installed on the shaft with fasteners (sleeve, lock nut and washer) between the inner diameter of the bearing and the shaft. It can also ensure the reliable fixing of the bearing even in applications with strong vibration and shock. However, when the tightening of the lock nut becomes loose, the fit with the shaft will also become loose during operation, and the mating surface will slide, which will cause the shaft and components to wear. On the contrary, when the lock nut is tightened too tightly, the inner ring of the bearing will expand, and the internal clearance of the bearing will be too small, which will cause abnormal heating and early wear. Therefore, great care must be taken when using fasteners to install bearings. The installation process of a seated rolling bearing with fasteners 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 is bent, scratched, burr, etc. (2) Insert the adapter sleeve into the shaft and place it at the installation position of the fixed bearing. When it is difficult to insert a tightly fitting adapter sleeve, insert a screwdriver into the incision part of the adapter sleeve to expand the incision to make the insertion easier. (3) Insert the seated bearing into the shaft. Then, the entire side of the bearing inner ring on the side where the lock nut is installed is pressed against the cylindrical retaining ring, and lightly tapped on the large diameter end surface of the adapter sleeve to make the inner diameter surface of the bearing inner ring and The tapered surface of the adapter sleeve is tight (Figure 14.6). Insert the adapter sleeve into the tapered bore bearing: (4) Install the washer and lock nut on the adapter sleeve, and tighten the lock nut by hand. (5) Set the bearing with seat at the predetermined position of the base and fix it with bolts. 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. (6) Tighten the lock nut of the fastener. Use a special wrench to tighten the lock nut, or use a clamp to clamp the gap on the outer diameter of the lock nut, and hit the clamp with a hammer to rotate the lock nut 1/4 to 1/3 turn (Figure 14.7). For the reference value of the tightening torque of the lock nut at this time, please refer to Table 5 at the end of the volume. When tightening the lock nut (7A) with a vertical seat bearing, loosen the mounting bolt of the bearing box on one side, adjust the axial position of the seated bearing while turning the shaft by hand, and tighten the bearing box again with the specified torque Install bolts. (7B) For flange type components, the axial positions of the bearing and the bearing housing must be correct and consistent. Therefore, in order not to produce the position deviation of the bearing inner ring, the lock nut must be tightened with great care. (8) Bend the claw (1 piece) of the washer that is consistent with the notch position on the outer diameter surface of the lock nut on the notch position on the outer diameter surface of the lock nut to prevent loosening of the lock nut (Figure 14.8). (9) Finally, turn the shaft by hand to confirm whether the rotation state of the bearing is abnormal.
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