The bearing is a component that fixes and reduces the load friction coefficient during the mechanical transmission. It can also be said that when other parts in the shaft relative to each other when the relative movement, used to reduce the power transmission process in the friction coefficient and maintain the axis of the central position of the fixed parts. Bearing is a contemporary mechanical equipment in a pivotal component. Bearings Its main function is to support the mechanical rotating body, in order to reduce the equipment in the transmission process of the mechanical load friction coefficient.
The motor does not have the consequences of bearing is simply can not work. Because the shaft may move in any direction, and the motor requires that the shaft only be rotated when working.
According to the different nature of the friction at work, the bearings are divided into sliding bearings and rolling bearings two categories.
The characteristics of sliding bearings
Sliding bearing work, the shaft and the bearing between the sliding friction, the drawback is greater friction loss, Bearings the use of maintenance is also more complex. The advantages of sliding bearings are as follows:
(1) simple structure, manufacturing, easy assembly and disassembly;
(2) has good impact resistance and good vibration absorption performance, smooth operation, no noise, high rotation accuracy;
(3) carrying capacity, long service life.
Therefore, sliding bearings in the high-speed, precision institutions and low-speed heavy load, impact load larger institutions, such as high-speed precision machine tools, Bearings stamping machinery and agricultural machinery applications more.
The characteristics of rolling bearings
Rolling bearings rely on the rolling contact between the main components to support rotating parts, which generally by the inner ring, outer ring, rolling body and cage and other components. The inner ring is mounted on the journal and rotates together, and the outer ring is mounted on the bearing seat. Rolling bearings, Bearings the outer ring on the processing of a raceway, when the inner and outer ring relative rotation, the rolling body that is, the outer ring rolling in the raceway. Commonly used rolling ball, cylindrical roller, needle roller, tapered roller, spherical roller, Bearings asymmetric spherical roller and so on.
The retainers are used to separate the rolling elements from each other so as not to interfere with each other. As the rolling body and the inner and outer ring is a point contact or line contact, the surface contact stress, so the inner and outer ring and rolling material should have good contact fatigue strength and impact toughness, the general use of bearing steel, heat treatment , The surface hardness of 61 ~ 65HRC, Bearings the working surface by grinding and polishing; cage generally made of low carbon steel plate stamping, Bearings but also useful non-ferrous metal or plastic.
Compared with the sliding bearing, the rolling bearing has the advantages of small friction resistance, low power consumption, flexible start and good interchangeability, Bearings so it has been widely used. The disadvantage is that the impact resistance is poor and the noise is too high.