Bearings are one of the most commonly used mechanical parts, bearing the rotation and reciprocating movement of the shaft, smoothing the movement of the shaft and supporting it. If bearings are used, friction and wear can be reduced. On the other hand, if the quality of the bearing is low, it will cause machine failure, so the bearing is regarded as one of the important mechanical parts.
So what types of bearings are there?
There are two main types of bearings: sliding bearings and rolling bearings.
Sliding bearing:
The sliding bearing is generally composed of a bearing seat and a bearing bush. In sliding bearings, the shaft and the bearing surface are in direct contact. It can resist high speed and shock loads. Plain bearings are used in the engines of automobiles, ships, and machines.
It is the oil film that supports the rotation. The oil film is a thinly spread oil film. When the oil temperature rises or the load is too heavy, the oil film will become thinner, causing metal contact and burning.
Other functions include:
1. The allowable load is large, the vibration and noise are small, and it can run quietly.
2. Through the implementation of lubrication status and maintenance, the service life can be used semi-permanently.
Rolling bearing
Rolling bearings are equipped with balls or rollers (round bars) to reduce frictional resistance. Rolling bearings include: deep groove ball bearings, angular contact ball bearings, tapered roller bearings, thrust bearings, etc.
Other functions include:
1. Low starting friction.
2. Compared with sliding bearings, there is less friction.
3. Since the size and accuracy are standardized, it is easy to buy.
Comparison of the working conditions of the two bearings:
Performance comparison:
Knowledge supplement: basic knowledge of fluid lubrication
Fluid lubrication refers to the state of lubrication in which the two are completely separated by a fluid film. On a sliding shaft, the pressure generated by the fluid in the bearing and the shaft gap supports the load on the bearing. This is called fluid film pressure. Lubrication reduces wear and friction through smooth movement. When used for a long time, lubricating oil is required.
To sum up, bearings are one of the most commonly used parts (standard parts) in mechanical design. Good use of bearings can improve product performance and reduce costs. Therefore, it is particularly important to master the relevant knowledge of bearings.
Post time: Apr-15-2021
