How to install the rolling bearing? Whether the rolling bearing can be installed correctly is related to the service life of the rolling bearing. I hope everyone will pay attention to it. Next, Zhejiang Mingball Bearing Co., Ltd. will take you in-depth analysis, and hope it will be helpful to you.
- Use professional disassembly tools
With advanced disassembly and assembly basis, it can effectively avoid the rolling bearing damage caused by improper tools during installation operation. When you install the bearing, the uneven force will easily cause deformation and cause unnecessary failure. - Preparation and inspection before installation
When installing the rolling bearing, pay attention to the fit with the main shaft and the fit with the bearing seat. The bearing and the shaft are matched with a base hole, and the shaft must be machined to a tolerance size corresponding to the inner diameter of the bearing. Generally require some interference. The tolerance is r, s and so on. Also note that there is a certain clearance required for the fit with the bearing seat. The tolerance is G, H, etc.
For new bearings, first check whether the bearing model is correct. Refer to Table 1 for the radial clearance standards of rolling bearings. For example: Model 6318 deep groove ball bearing, bearing inner diameter 90mm, its radial clearance range is 0.016~0.046mm, the maximum wear of the bearing can also be found to be 0.25mm.
Three, check the matching size of the bearing and the rotor shaft
When assembling the motor, it is necessary to carefully check the matching size of the bearing and the rotor shaft when the bearing is installed, and the matching size of the bearing outer ring and the end cover hole.
Fourth, control the amount of oil in the bearing and the bearing chamber
Excessive oil in the bearing and the box will cause the rolling elements of the bearing to slip, causing the rolling friction to change from rolling friction to sliding friction, which will damage the rolling elements of the bearing. Due to the excessive oil in the bearing, the free space in the bearing box is small and the operating temperature of the bearing will be reduced. Rising, the lubricating grease density decreases, the rolling element lubricating oil film becomes thin, the lubrication condition is poor, it is easy to cause abnormal bearing noise, surface slippage, and shorten the life of the bearing. Generally, there is a bearing oil chamber on the side of the motor end cover (except for the motor designed as a double-sealed bearing). According to the motor speed, the bearing chamber can be filled with oil according to the following standards: when the motor speed is 3000r/min, it should be less than or equal to the bearing volume 1/3 of it. In the actual work process, for bearings that run at high temperatures and high speeds, bearings with sealing surfaces should be used as little as possible, increasing the amount of oil in the motor oil cover, and installing a refueling nozzle, which can increase the operating life of the motor bearing.
Five, pay attention to ensure that the insulation is intact
For bearings with an insulation design on the outer ring, care must be taken to ensure that the insulation is intact. If the bearing insulation is damaged during installation, the thin oil film of the bearing will be broken down by the shaft voltage. After the oil film breaks down, not only will the lubrication conditions of the rolling elements be poor, but also the electric sparks generated will cause electric corrosion to the rolling elements of the bearing, causing the rolling elements The surface is not polished, which accelerates the wear of the bearing.
The above are some of the rolling bearing installation methods shared by the famous ball bearings. I hope to help everyone, avoid unnecessary losses and reduce the life of the bearing. If there is anything unclear, you are welcome to consult the editor.
