The roller bearing has a specified clearance according to the contract when it is manufactured. This clearance is generally called the original clearance; when the bearing is installed on the main engine, due to the interference fit of a certain ring, the bearing clearance value is reduced. Small, the clearance formed after installation is called installation clearance; after operation, the temperature of the bearing parts increases, the volume changes, and the elongation phenomenon also occurs due to the increase in the temperature of the shaft or shell matched with the bearing. This causes the clearance of the rolling bearing to change again, and this working clearance is called the working clearance. The working clearance is generally smaller than the installation clearance, and sometimes this clearance value will also increase with the different assembly and installation methods. Roller bearings are generally composed of four parts: inner ring, outer ring, rolling body and cage. In addition, lubricants have a great influence on the performance of rolling bearings, so lubricants are sometimes used as the fifth largest part of rolling bearings. Function: 1. The inner ring usually fits tightly with the shaft and rotates with the shaft. 2. The outer ring usually cooperates with the bearing seat hole or the shell of the mechanical part to play a supporting role. However, in some applications, the outer ring rotates, the inner ring is fixed, or both the inner and outer rings rotate. 3. The rolling elements are evenly arranged between the inner ring and the outer ring with the help of the cage. Its shape, size and quantity directly affect the bearing capacity and performance. 4. The cage evenly separates the rolling elements, guides the rolling elements to move on the correct track, and improves the internal load distribution and lubrication performance of the bearing. According to the shape of the rolling elements, rolling bearings can be divided into ball bearings and roller bearings. According to the size of the contact angle and the direction of the load it can bear, bearings can be divided into: 1. Radial bearings: nominal contact angle: 0° 45°, radial bearings can be subdivided into: A. Radial contact bearings: = 0°, can only bear radial load (such as cylindrical roller bearing), or mainly used to bear radial load, but can also bear a small amount of axial load (such as deep groove ball bearing); B, radial angular contact bearing : 0°< 45°, can bear radial load and unidirectional axial load at the same time (such as angular contact ball bearing and tapered roller bearing). 2. Thrust bearing: Nominal contact angle: 45°< 90°, the thrust bearing can be subdivided into: A. Axial contact bearing: =90°, only used to bear axial load; B. Thrust angular contact bearing: 45°<<90° mainly bears a large axial load, and can also bear a small radial load. According to the self-aligning performance, bearings can be divided into self-aligning bearings and non-self-aligning bearings.
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