Disassembly and assembly of roller bearings

The same needle roller bearing can be disassembled in four different ways. The simpler is the percussion method. A certain percussive force is applied to the inner ring of the needle roller bearing, mainly not to the rolling element and cage of the needle roller bearing. When the needle roller bearing is at the end of the shaft, use a copper rod smaller than the inner diameter of the needle roller bearing or other soft metal materials to resist the shaft end, add a spacer block to the lower part of the needle roller bearing, and tap it with a hand hammer to remove it.

        Although this method of disassembly is simple and easy to implement, it is easy to damage the needle bearing; and when applying this method, attention should be paid to the proper placement of the pad and the correct focus point. In order to avoid damage to the needle roller bearings, the pressing method can be used to push the needle roller bearings with the help of the press. The work is stable and reliable, and the machine and needle roller bearings are not damaged, but the premise is that the focus point should be on the shaft. The upper middle should not be biased.

        There is also a thermal disassembly method, which is usually used to disassemble tightly-fitted needle roller bearings. The oil heated to about 100°C is poured on the needle roller bearings to be dismantled with an oil can. After the needle roller bearing rings are heated and expanded , You can pull it out with a pull tool.

        Before heating the needle roller bearing, wrap the shaft with asbestos rope or thin iron plate to prevent the shaft from swelling due to heat, otherwise it will be difficult to disassemble. When disassembling the needle roller bearing from the needle bearing housing hole, only heat Needle roller bearing housing hole, can not heat the needle roller bearing.

        In addition, the disassembly of the needle roller bearing can also be completed by pulling out. When a special puller is used for disassembly, as long as the handle is rotated, the needle roller bearing will be slowly pulled out. When removing the outer ring of the needle roller bearing, the corners of the two legs of the puller should be opened outward; when removing the inner ring of the needle roller bearing, the two legs of the puller should be inward and stuck on the end surface of the inner ring of the needle roller bearing.

1. Wash the bearing with kerosene, press it into the bearing seat, fill the rollers of the outer ring of the bearing with Shell No. 3 lithium base grease to two-thirds full, apply it evenly with a clean hand, install the ntn bearing gland, and use the top coating The tightening bolt of the bolt anti-loosening glue presses the bearing gland, and the bearing should be sleeved on the rotating shaft and in place.

     2. Install the bearing seat on the casing, and tighten the bearing seat with fastening bolts coated with bolt anti-loosening glue.

     3. Install the inner and outer eccentric block on the shaft and confirm it in place. If there is a shaft key, install the shaft key in the keyway and then install the outer eccentric block, and install the shaft retaining ring on the shaft.

     4. Tighten the fastening bolts of the eccentric block, turn the adjustable eccentric block to the angular position before removal and tighten the fastening bolts. After the assembly is completed, the shaft should be moved in a certain axial direction.

     5. Put on the protective covers at both ends of the vibration motor and fasten them with screws.