The Function and Skill of Joint Bearings

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Unlike rolling bearings, joint bearings have a completely different design and working mechanism. As a result, they possess unique characteristics and require specific maintenance considerations. Understanding these features is essential for optimal performance and longevity. 1) **Operating Temperature** The allowable operating temperature of a joint bearing depends mainly on the materials used in its sliding surfaces. For example, in self-lubricating joint bearings made with plastic materials, the load capacity may decrease at high temperatures. When the sliding surfaces are made of steel-to-steel, the maximum temperature is determined by the lubricant's properties. However, most self-lubricating joint bearings can operate within a temperature range of -30°C to +80°C, provided that proper installation and usage guidelines are followed. 2) **Inclination Angle** One of the key advantages of joint bearings is their ability to handle larger misalignment compared to standard rolling bearings. They are ideal for applications where perfect concentricity is not achievable. The allowable angle of inclination varies depending on the bearing type, size, sealing method, and support structure. Typically, radial joint bearings allow an inclination of 3° to 15°, angular contact joint bearings allow 2° to 3°, and thrust joint bearings can tolerate 6° to 9°. 3) **Fit and Cooperation** When selecting the fit for a joint bearing, it is crucial to avoid uneven deformation of the inner or outer ring. The choice of fit type and grade should be based on the bearing type, support configuration, and load conditions. A proper fit ensures smooth operation and reduces the risk of premature wear. 4) **Installation and Removal** Proper installation and removal techniques are vital to prevent damage to the bearing. The force applied during installation or disassembly should never be transmitted directly through the spherical sliding surface. Instead, tools such as sleeves or pullers should be used to apply even pressure to the mating parts. In some cases, heating may be necessary to facilitate the process.

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