how to disassemble the bearing?
The rotating shaft of the motor is closely matched with the inner ring of the bearing. Usually, the inner ring of the bearing is pressed against the journal by pressing in, so that the inner ring of the bearing can rotate together with the rotating shaft when the motor is running. Therefore, disassembling the motor bearing is a cumbersome task.
Commonly used bearing disassembly methods are as follows:
(1) Disassemble the bearing with a special puller
When disassembling with a special puller, place the foot of the puller on the inner ring of the bearing, but not on the outer ring to prevent the bearing from being pulled, as shown in Figure 1-5. The apex of the puller screw should be aligned with the center of the shaft. The puller should be parallel to the shaft. When the handle is rotated, the force should be uniform and the rotation should be slow to prevent the bearing from being pulled too quickly. In order to make the disassembly easy, some kerosene may be infiltrated between the inner ring of the bearing and the rotating shaft.
(2) Disassemble the bearing with a metal rod
When there is no special puller or is not suitable for disassembly, the metal rod can be placed on the inner ring of the bearing, and the metal rod is hammered with a hammer, and the bearing is slowly knocked out from the rotating shaft, as shown in Figure 1-6. Shown. In order to prevent bearing damage during tapping, the force should not be too violent. The two corresponding sides of the bearing should be beaten in turn, not only on one side, so that the bearing inner ring is evenly stressed.
(3) Disassemble the bearing on the cylinder
Place the bearing on the cylinder, place two iron plates under the bearing inner ring, and rest the iron plate on a cylinder with an inner diameter slightly larger than the outer diameter of the shaft, as shown in Figure 1-7. In order to prevent the bending of the shaft and the deformation of the end, it is not possible to directly hit the end face of the shaft with a hammer. A hard wood board or a copper block should be placed on the end surface of the shaft, and then the board or the copper block is hit with a hammer. The point of impact when striking should be aligned with the center of the shaft, and the force should not be too violent. In order to prevent the rotor or the shaft from being damaged when the bearing is detached, some soft things should be placed at the bottom of the cylinder. In addition, when the bearing is gradually loosened, the tapping force should also be reduced.
(4) Heating method to disassemble the bearing
The method of disassembling the bearing by heating is to use the principle of thermal expansion and contraction to make the inner ring of the bearing expand and then remove it. It is suitable for situations where assembly tolerances are too tight or bearing oxidation is difficult to disassemble using the above methods. Before heating, in order to make the bearing and the rotating shaft produce a significant temperature difference and prevent heat dissipation, wrap the rotating shaft with a cloth soaked in cold water, then pour the oil heated to about 100 °C on the inner ring of the bearing, and remove the bearing. under.
(5) Bearing removal method in the end cover hole
When the bearing outer ring and the motor end cover hole are tightly assembled, the outer ring of the bearing is left in the motor end cover hole after the end cover is removed. At this point, the end cap can be facing up and placed smoothly on the two iron plates, and be careful not to catch the bearing, as shown in Figure 1-8. Then, a metal rod with a diameter slightly smaller than the outer diameter of the bearing is placed on the bearing outer ring, and the bearing outer ring can be pushed out by slowly tapping the metal rod with a hammer.
