Explained by experts: about the installation and disassembly of NSK bearings

nsk bearing installation:

1. Before installing the imported bearing on the shaft, you must first unplug the fixing pin of the bearing housing, and at the same time, polish the surface of the journal smoothly and clean, and apply oil to the journal to prevent rust and lubricate (allow the bearing to rotate slightly on the shaft).

2. Apply lubricating oil on the mating surface of the bearing seat and the bearing, and install the bearing into the bearing seat. Then put the assembled bearing on the shaft together with the NSK bearing seat. Push to the desired location for installation.

3. Do not tighten the bolts that fix the bearing seat, but allow the bearing housing to rotate in the bearing seat. Also install the bearing and seat on the other end of the same shaft, rotate the shaft a few times, and let the bearing itself automatically find its position. Then tighten the bearing seat bolts.

4. Install eccentric sleeve. First put the eccentric sleeve on the eccentric step of the inner sleeve of the bearing, and tighten it by hand in the direction of rotation of the shaft. Then insert the small iron rod into or against the counterbore on the eccentric sleeve. Knock the small iron rod along the axis of rotation with a hand hammer. Install the eccentric sleeve firmly, and finally tighten the hexagon socket screws on the eccentric sleeve.

nsk bearing disassembly:

1. Disassembly of the outer ring

Remove the outer ring of the interference fit, set several screws for extruding the outer ring on the circumference of the outer ring in advance, tighten the screws evenly on one side, and remove them. These screw holes are usually covered with blind plugs and separable NSK bearings such as tapered roller NSK bearings. Several cuts are set on the housing shoulders. Use spacers to remove them with a press or gently tap them to remove them.

2. Disassembly of cylindrical bore NSK bearings

The disassembly of the inner ring can be pulled out with a press machine. At this time, pay attention to let the inner ring bear its pulling force. The inner ring of large NSK bearings is disassembled by hydraulic method. Oil pressure is applied through the oil hole provided on the shaft to make it easy to draw. NSK bearings with a large width are combined with a hydraulic method and a drawing fixture for disassembly operations. The inner ring of NU and NJ cylindrical roller NSK bearings can be disassembled by induction heating. It is a method to heat the part in a short time to expand the inner ring and then pull it out.

3. Disassembly of tapered NSK bearing

Disassemble the relatively small NSK bearing with adapter sleeve, support the inner ring with the stopper fastened on the shaft, turn the nut back several times, and use the spacer to knock it off with a hammer. Large-scale NSK bearings are easier to disassemble by oil pressure. The oil is pumped through the oil hole on the tapered shaft to expand the inner ring and disassemble the NSK bearing. During operation, there is a possibility that the NSK bearing may come out suddenly. It is better to use the nut as a stop.