Adjustment measures for problems after bearing installation

When installing, do not directly hammer the end face and non-stressed surface of the bearing. Use pressure blocks, sleeves or other installation tools to make the bearing evenly stressed. Do not install through rolling elements. If the mounting surface is lubricated, the installation will go more smoothly. If the fit interference is large, the bearing should be placed in mineral oil and heated to 80~90°C before installation as soon as possible. Strictly control the oil temperature not to exceed 100°C to prevent the tempering effect from reducing the hardness and affecting dimensional recovery. When you encounter difficulties in disassembly, it is recommended that you use a disassembly tool to pull outwards while carefully pouring hot oil on the inner ring. The heat will expand the inner ring of the bearing, making it easier to fall off.

Not all bearings require minimum working clearance, you must choose the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups - group 2, group 0, group 3, group 4, and group 5. The clearance values are in order from small to large, among which group 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal temperatures and commonly used interference fits; bearings working under special conditions such as high temperature, high speed, low noise, and low friction should use large radial clearance; Bearings for precision spindles and machine tool spindles should use smaller radial clearances; roller bearings can maintain a small amount of working clearance. 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 withstand a certain load rotation, and there are also friction caused by the bearing fit and load. The amount of elastic deformation.

Regarding the sealing defects of bearings with embedded seals, there are two steps that need to be strictly carried out during the adjustment process.

1. The mounting structure of the embedded sealed bearing is changed to both sides of the bearing. The mounting structure of the bearing is adjusted from the equipment. It does not require direct contact with the bearing. The bearing is dust-proofed from the outside of the bearing. The sealing effect of this structure is higher than the sealing of the bearing itself sold by the bearing agent, directly blocking the intrusion path of particulate matter and ensuring the cleanliness of the inside of the bearing. This structure increases the heat dissipation space of the bearing and has less damage to the fatigue resistance of the bearing.

2. Although the external sealing method of the bearing has good sealing effect, the heat dissipation path is also blocked, so cooling components need to be installed. The cooling device can reduce the operating temperature of the lubricant. After cooling, natural heat dissipation can avoid high-temperature operation of the bearing.

Time: 2023-09-21