Joint bearings are widely used for low-speed oscillating motion

- May 31, 2019-

Joint bearings are widely used in engineering hydraulic cylinders, forging machine tools, engineering machinery, automation equipment, automotive shock absorbers, hydraulic machinery and other industries. Joint bearing introduction and classification of spherical plain bearings, the basic type is composed of spherical sliding spherical contact surface The inner and outer rings are composed. Depending on its structure and type, it can withstand radial loads, axial loads, or combined loads acting in both radial and axial directions. Because the spherical sliding contact area of the joint bearing is large, the inclination angle is large, and because most of the joint bearings adopt special processing methods, such as surface phosphating, galvanizing, chrome plating or outer sliding surface lining, inserting, spraying and the like. Therefore, it has large load capacity and impact resistance, and has the characteristics of corrosion resistance, wear resistance, self-aligning, good lubrication or self-lubricating and non-lubricating dirt pollution, even if the installation is misplaced, it can work normally. Therefore, joint bearings are widely used for low-speed oscillating motions, tilting motions, and rotational motions. Joint bearing composition The joint bearing is mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface.


Technical performance of the joint bearing Since the structural form and working mechanism of the joint bearing are completely different from those of the rolling bearing, the joint bearing has its own technical characteristics and maintenance requirements.


(1) Operating temperature The allowable operating temperature of the joint bearing is mainly determined by the mating material between the sliding surfaces of the bearing, especially the sliding surface of the plastic material of the self-lubricating joint bearing, and its bearing capacity will decrease at high temperatures. For example, when the sliding surface material of a lubricated joint bearing is paired with steel/steel, the allowable operating temperature depends on the allowable operating temperature of the lubricant. However, for all lubricated and self-lubricating joint bearings, they can be used in the temperature range of -30 ° C ~ +80 ° C, and maintain the correct bearing capacity.


(2) The inclination of the inclined joint bearing is much larger than that of the generally adjustable rolling bearing. It is suitable for use in the bearing part where the concentricity is not high. The inclination of the joint bearing depends on the size, type, sealing device and support form of the bearing. Differently, the general radial bearing has an inclination angle of 3° to 15°, the angular contact joint bearing has an inclination angle of 2° to 3°, and the thrust joint bearing has an inclination angle of 6° to 9°.


(3) Coordination In any case, the joints selected for the joint bearings shall not cause uneven deformation of the ferrule. The matching of the matching properties and grades shall be determined according to the working conditions such as bearing type, support form and load size.


(4) Loading and unloading The loading and unloading of the joint bearing should follow the principle that the force applied by the assembly and disassembly cannot be transmitted directly through the spherical sliding surface. In addition, auxiliary loading and unloading tools, such as sleeves, detachers, etc., should be used to directly and uniformly apply the loading and unloading force applied by the outside to the ferrule to be fitted, or to perform load-free loading and unloading by an auxiliary method such as heating.