The types and structural characteristics of joint bearings
date:2024.08.05News type:Bearing knowledge
- Classification by load direction
Joint bearings can be divided into the following categories according to the direction of the load they bear or the nominal contact Angle:
a) Centripetal bearing
Mainly bear radial load, nominal contact Angle between 0°≤τ≤30°, specifically divided into:
Radial contact bearing: nominal contact Angle τ=0°, suitable for bearing radial load and small amplitude axial load.
Angular contact radial joint bearing: nominal contact Angle 0°<τ≤30°, suitable for bearing radial and axial loads at the same time.
b) thrust bearing
The main axial load is borne, and the nominal contact Angle is between 30°<τ≤90°, which is divided into:
Axial contact thrust joint bearing: nominal contact Angle τ=90°, suitable for single direction axial load.
Angular contact thrust joint bearing: nominal contact Angle 30°<τ<90°, suitable for mainly bearing axial loads, but also can bear joint loads.
2. Classification by outer ring structure
According to the different structure of the outer ring, the joint bearing can be divided into:
Integral outer ring joint bearing
Single seam outer ring joint bearing
Double-slit outer ring joint bearing
Double and half outer ring joint bearing
3. Classified according to whether there is a rod end body
According to whether the rod end body is attached, the joint bearing can be divided into:
Common joint bearing
Rod end joint bearing
Among them, the rod end joint bearing can be further classified according to the connection characteristics of the parts matched with the rod end body and the rod end handle:
Depending on the part that fits into the rod end body
Assembly rod end joint bearing: rod end with cylindrical hole rod end eye, hole with or without bolt rod centripetal joint bearing.
Integral rod end joint bearing: rod end with spherical hole rod end eye, hole is equipped with bearing inner ring with or without bolt rod.
Ball head bolt rod end joint bearing: rod end with ball head seat, the seat is equipped with ball head bolt.
According to the connection characteristics of the rod end handle
Internal threaded rod end joint bearing: rod end handle for internal threaded straight rod.
External threaded rod end joint bearing: rod end handle for external threaded straight rod.
Rod end joint bearing with welded seat: the rod end handle is a flange seat, a square seat or a cylindrical seat with a positioning pin, which is fixed at the end of the rod by welding.
Rod end joint bearing with locking seat: rod end handle with internal thread slotted and equipped with locking device.
4. Classify according to whether it needs re-lubrication and maintenance
According to whether the joint bearing needs to be lubricated and maintained during work, it can be divided into:
Maintain lubricated knuckle bearings
Maintenance-free self-lubricating joint bearing
5. Classified by sliding surface friction pair material
According to the combination form of sliding surface friction pair materials, joint bearings can be divided into:
Steel/steel joint bearings
Steel/copper alloy knuckle bearings
Steel /PTFE composite joint bearing
Steel /PTFE fabric joint bearings
Steel/reinforced plastic joint bearings
Steel/zinc base alloy joint bearing
6. Classification by size and tolerance unit
Joint bearings according to the size and tolerance unit of the unit, can be divided into:
Metric joint bearings
Inch joint bearing
7. Categorize by comprehensive factors
According to the direction of load bearing, nominal contact Angle and structural type, joint bearings can be divided into:
Centripetal joint bearing
Angular contact joint bearing
Thrust knuckle bearing
Rod end joint bearing
8. Sort by structure shape
Joint bearings can also be divided into various types according to their structural shape (such as whether there is a sealing device, the structure of the lubrication groove and the lubrication hole, the structure of the lubricant distribution groove, the number of lock ring grooves and the direction of rotation of the rod end body thread, etc.).
