Adjustment measures for problems after bearing installation
During installation, do not directly hammer the bearing end face and non stressed surface. Use pressure block, sleeve or other installation tools to make the bearing bear uniform force. Do not transmit power for installation through rolling elements. If the mounting surface is coated with lubricating oil, the installation will be smoother. If the fit interference is large, the bearing shall be installed as soon as possible after being heated to 80 ~ 90 ℃ in mineral oil, and the oil temperature shall be strictly controlled not to exceed 100 ℃ to prevent tempering effect, hardness reduction and size recovery. In case of difficulty in disassembly, it is recommended that you carefully pour hot oil on the inner ring while pulling outward with the disassembly tool. The heat will expand the bearing inner ring and make it easier to fall off.
Not all bearings require minimum working clearance. You must select the appropriate clearance according to the conditions. In national standard 4604-93, the radial clearance of rolling bearing is divided into five groups – group 2, group 0, group 3, group 4 and group 5. The clearance value increases from small to large, of which group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit; Large radial clearance should be selected for bearings working under special conditions such as high temperature, high speed, low noise and low friction; Small radial clearance should be selected for precision spindle and bearing for machine tool spindle; For roller bearings, a small amount of working clearance can be maintained. In addition, there is no clearance for separate bearings; Finally, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear certain load rotation, as well as the elastic deformation caused by bearing fit and load.
In view of the sealing defects of the embedded sealed bearing, there are two steps to be strictly carried out in the process of adjustment.
1. The installation cover structure of embedded sealed bearing is changed to both sides of the bearing. The installation structure of the equipment bearing is adjusted without direct contact with the bearing. The bearing is dustproof from the outside of the bearing. The sealing effect of this structure is higher than that of the bearing sold by the bearing agent, which directly blocks the invasion path of particulate matter and ensures the cleanness of the inside of the bearing. This structure improves the heat dissipation space of the bearing and has little damage to the anti fatigue performance of the bearing.
2. Although the external sealing mode of the bearing has good sealing effect, the heat dissipation path is also blocked, so it is necessary to install cooling parts. The cooling device can reduce the operating temperature of the lubricant. After cooling, the natural heat dissipation can avoid the high-temperature operation of the bearing.
