Joint bearing is a spherical plain bearings, the sliding contact surface is an inner and an outer spherical surface, movement of rotating in any angle, it uses surface phosphating, Sheath bearings  fried mouth, inserts, pads, spray and other special treatment method produced. Joint with load bearing capacity, impact resistance, corrosion resistance, wear resistance, self-aligning, lubrication is good.
Joint bearing Categories: Spherical Plain bearings, angular contact spherical plain bearing, Special Bearings thrust bearing joints, rod ends.
First, joint bearing according to different classification methods,bearings for motor  can bear the load according to the direction or different nominal contact angle, divided into the following categories.
1, the spherical plain bearings - used to bear radial load, the nominal contact angle from 0 degrees to 45 degrees, according to the different nominal contact angle, can be divided into:
a. Contact Spherical Plain Radial bearings - nominal contact angle of 0 degrees to the spherical bearing, suitable for radial loads. But it can bear radial load, while not bear the axial load motor bearings.
b. Angular Contact Spherical Plain Bearings - nominal contact angle greater than 0 degrees, but less than or equal to 45 degrees of the spherical bearing, can bear radial load and axial load while the role of joint load.
2, thrust bearing joints - for axial load, the nominal contact angle greater than 45 degrees to 90 degrees, according to the different nominal contact angle, can be divided into:
a. axial contact thrust bearing joints - the nominal contact angle of 90 degree thrust bearing joints, Low-noise bearings suitable for pure axial load to bear.
b. Angular Contact Thrust Spherical Plain Bearings - nominal contact angle greater than 45 degrees, but less than 90 degrees of thrust bearing joints, is suitable for axial load, but also can withstand the combined load (in this case the value of not greater than the radial load axial load of 0.5 times).
Second, joint bearing structure according to the outer ring is divided into:
a. total joint bearing outer ring;
b. Double semi-joint bearing outer ring;
c. joint bearing outer ring slit;
d. Double-slit outer ring (split outer ring) joint bearings.
3, joint with a Deep Groove Ball Bearings according to whether or installed on the rod side is divided into:
a. General joint bearings;
b. rod ends.
Fourth, joint bearing according to whether it is necessary to add lubricant when the work is divided into:
a. Non-Self-lubricating plain bearings;
b. self-lubricating bearings.
5, joint bearings can bear the load according to the direction of the nominal contact angle and structure to be divided into:
a. Spherical Plain bearings;
b. Angular Contact Spherical Plain Bearings;
c. Thrust spherical plain bearings;
d. rod ends.
Joint bearings are widely used in various engineering machinery, hydraulic steering with electric power and other utility facilities.