Joint bearing

The joint bearing is a special type of plain bearing. Its structure is simpler than rolling bearings. It consists mainly of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. It can withstand large loads. According to its different types and structures, it can withstand radial loads and shafts. Combined load to load or radial and axial simultaneously.

Joint bearings are generally used for low-speed oscillating motion (ie angular motion). Since the sliding surface is spherical, it can also be tilted within a certain angle range (ie, aligning motion), and the support shaft and the shaft hole are not concentric. When the degree is large, it still works normally.

Joint bearings can withstand large loads. Depending on its type and construction, it can withstand radial loads, axial loads or combined loads in both radial and axial directions. Since the outer surface of the inner ring is provided with a composite material, the bearing can be self-lubricated during operation. Generally used for low-speed oscillating motion, and low-speed rotation, it can also be tilted within a certain range of angles. When the support shaft and the shaft housing hole are different, they can still work normally. Self-lubricating joint bearings are used in water conservancy and professional machinery industries.

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 made 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 misaligned, it can work normally. Therefore, joint bearings are widely used for low-speed oscillating motions, tilting motions, and rotational motions. Edit this section of the 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.

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 selection 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 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.