Spherical plain bearings are spherical sliding bearings, and the basic type consists of inner and outer rings with spherical sliding spherical contact surfaces. Joint bearings are mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface, which can withstand large loads. Depending on their different types and structures, they can withstand radial loads, axial loads, or combined radial and axial loads. Due to the composite material embedded on the outer spherical surface of the inner ring, this bearing can generate self-lubrication during operation. Generally used for low speed swing motion, but also for tilting motion within a certain angle range. When the bearing shaft and shaft shell hole are not concentric, they can still work normally. Self lubricating joint auxiliary bearings are used in industries such as water conservancy and professional machinery. "Because of the large spherical sliding contact area and large inclination angle of spherical plain bearings, and also because most spherical plain bearings adopt special processing methods, such as surface phosphating, zinc plating, chromium plating, or external sliding surface lining, pad insertion, spraying, etc.". Therefore, it has a large load capacity and impact resistance, and has the characteristics of corrosion resistance, wear resistance, self centering, good lubrication, or self lubrication without lubricating dirt pollution. It can work normally even if it is installed incorrectly. Therefore, joint bearings are widely used in low speed swing, tilt, and rotational motions.
Spherical plain bearings and rod end spherical plain bearings have various designs and different combinations of sliding contact surfaces. Each design and combination has unique performance, making it particularly suitable for certain applications.
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