Analysis on disassembly skills of bearing

The disassembly of the bearing shall be carried out with the same care as the installation. Pay attention not to damage the bearing and parts, especially the disassembly of interference fit bearing, which is difficult to operate. Therefore, in the design stage, it is necessary to consider the convenience of disassembly in advance, and it is also very important to design and manufacture disassembly tools according to needs. During disassembly, the disassembly method and sequence shall be studied according to the drawings, and the matching conditions of the bearing shall be investigated to ensure the safety of the disassembly operation.

1. Removal of outer ring

Remove the outer ring of the interference fit. Set several outer ring extrusion screws on the circumference of the shell in advance. Tighten the screws equally while removing. These screw holes are usually covered with blind plugs, tapered roller bearings and other separate bearings. Several cuts are set on the housing shoulder. Use cushion blocks, disassemble with a press, or knock gently.

2. Disassembly of cylindrical bore bearing

The inner ring can be removed by pressure machinery. At this time, pay attention to make the inner ring bear its pulling force.

The inner ring of large bearing is disassembled by oil pressure method. Oil pressure is applied through the oil hole arranged on the shaft to make it easy to pull out. For the bearing with large width, the oil pressure method is used together with the drawing fixture for disassembly.

The inner ring of Nu and NJ cylindrical roller bearings can be disassembled by induction heating. It is a method of drawing after heating part in a short time to expand the inner ring.

3. Disassembly of tapered bore bearing

Disassemble the relatively small bearing with fixed sleeve, support the inner ring with the stop fastened on the shaft, turn the nut back several times, use the cushion block and knock it with a hammer for disassembly.

For large bearings, it is easier to disassemble by oil pressure. Pressurize and send oil in the oil hole on the taper hole shaft to expand the inner ring and disassemble the bearing. During operation, the bearing may suddenly come out. It is best to use the nut as a stop.