The Introduction of Roller Bearings
The roller bearing is a kind of rolling bearing, which is widely used in modern machinery. It relies on rolling contact between the main components to support the rotating parts. Roller bearings are now mostly standardized. Roller bearing has the advantages of small starting torque, high rotation precision and convenient selection.
The rolling bearing is divided into ball bearing and roller bearing according to the rolling body. Roller bearings rely on rolling contact between the main parts to support the rotating parts. Different roller bearings can bear different radial and axial forces. When choosing roller bearings, the choice should be made according to the specific working conditions.
Roller bearings are mainly composed of aligning roller bearings, thrust aligning roller bearings, tapered roller bearings and cylindrical roller bearings.
Type of Selection
When choosing bearings, the main considerations are as follows:
The size, direction and nature of the bearing load are the main factors in the selection of bearing. When selecting the bearing according to the size of the load, compared with the point contact of the ball bearing, the main components in the roller bearing are linear contact, easy to bear the load, bearing deformation is small.
When choosing the bearing according to the direction of load, the thrust bearing is generally chosen for the pure axial load. Thrust roller bearings are selected for larger axial forces. Smaller axial forces are selected for thrust ball bearings. For pure radial load, deep groove ball bearings, cylindrical roller bearings or needle bearings are generally used. Deep groove ball bearings or tapered roller bearings can be selected when the radial load is borne and the axial load is not large. When the axial load is large, the angular contact ball bearings or tapered roller bearings with larger contact angles can be selected.
In general, the speed will not have any impact on the choice of bearing type, but when the speed is large, the speed should be included in the bearing selection standards.
(1) compared with roller bearing, ball bearing has a higher limit speed, so in the case of high speed, the ball bearing is preferred.
(2) in the case of the same inner diameter, the smaller the outer diameter is, the smaller the rolling body will be. Therefore, the centrifugal force of the rolling body added on the outer ring will be smaller, so it is more suitable to work in the state of high rotation speed. According to the properties given in table 1. needle roller bearings are more suitable for high-speed operation.
Adjustable performance of bearing
When the centerline of the shaft does not coincide with the centerline of the bearing housing and there is an Angle error, or when the shaft is bent or tilted due to the force on the shaft, the axis of the inner and outer rings of the bearing will be deflecting. At this time, should be used to have a certain centering performance of the aligning bearings or with seat outer spherical ball bearings.
Roller bearings are the most sensitive to the deflection of bearings, and the bearing capacity of such bearings in the deflection state may be lower than that of ball bearings. Therefore, when the supporting stiffness of shaft stiffness and bearing socket hole is relatively low, or when there is a large deflection torque, should try to avoid using this kind of bearing.
Bearing mounting and dismounting
When parts must be installed and disassembled along the axial direction without dividing the surface of the bearing housing, bearings with detachable inner and outer rings (such as N0000. NA0000. 30000. etc.) shall be preferred.
Roller bearing applications.
Large and medium-sized motor, rolling stock, machine tool spindle, internal combustion engine, generator, gas turbine, aerospace bearings, reducer, rolling mill, vibrating screen and hoisting and transportation machinery.
Where to buy bearings
There are many bearing channels and resources form different counties, buyers could search bearing china as keywords on Google. Additionally, they also could according to their requirements to search for different keywords, like small roller bearings, titanium roller bearings, etc.