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High and low speed bearings are generally positioned at linear speed rather than rotational speed. The Distinction speed of high-speed bearings should meet the speed requirements of more than 60 meters per second, so small bearings may be tens of thousands of revolutions, but they are not high-speed bearings,
and super large bearings are even high-speed bearings with hundreds of revolutions per minute, because the latter has a large linear speed. In the sliding bearing, hydrostatic bearing, hydrodynamic bearing, aerostatic Distinction bearing and aerodynamic bearing are all suitable for high-speed rotation.
Rolling bearings are generally used for low-speed and sliding bearings are generally used for high-speed. As the name suggests, rolling bearings have balls, spherical, cylindrical and Distinction conical. Sliding bearings are usually bearing shells.
High and low speed bearings are difficult to distinguish by appearance, and most of the common low-speed Distinction bearings are cheap, but more high-speed bearings are used inside the machine.
High speed bearings are generally used inside the machine for cooling and lubrication with liquid bearing oil. If the bearings are not used in cars Distinction where the speed of the motor is high and there is little force,
high-speed bearings can also be cooled and lubricated with solid bearing oil. Generally, the high-speed bearing is used inside the engine transmission differential, while the Distinction low-speed bearing is used in the chassis such as the axle hub bearing.
1. The precision of high-speed bearing is higher than that of low-speed Distinction bearing, and its surface roughness is small.
The intuitive difference is that the surface of high-speed bearing is smoother than that of low-speed bearing, and the clearance between shaking outer ring and inner ring of Distinction high-speed bearing is smaller, while that of low-speed bearing is the opposite.
2. Compared with low-speed bearings, the accuracy of steel balls or rollers of high-speed bearings is different, and the accuracy of raceway is higher than that of low-speed bearings. High speed bearings have high grade and good material, such as metallographic structure and hardness of steel.
The general rolling bearing is suitable for low and medium speed rotation. If the high-speed rotation of rolling bearing requires special requirements, its model can be reasonably selected according to the load and other factors.
If the speed is between 5 and 60 meters per second, even if it is not a high-speed bearing, the general bearing can be basically satisfied as long as it can be lubricated. If higher speed bearings are used in some special occasions,
such as high-speed rotating bearings used in high-speed cutting machine tools or precision machining machine tools, and special bearings such as ceramic bearings, electric power bearings and magnetic bearings, it is necessary to contact professional manufacturers.
Bearing discoloration. When the bearing operates under continuous high temperature, it will produce black or blue. The main reasons for bearing discoloration are: the lubrication in the bearing does not meet the technical requirements; Dirt or impurities invaded during bearing installation;
The fit of the bearing with the journal and shaft hole is loose, resulting in sliding friction between the inner and outer rings of the bearing; The non concentricity between the bearing seat hole and the journal leads to abnormal effects on the bearing during operation;
The bearing operates its own designed bearing capacity due to overspeed or overload operation; The axial clearance of the round cone roller bearing is small, and the bearing has large friction with the sealing device, washer and bushing.