Why can the sealing design of the outer spherical bearing accurately prevent impurities from entering and maintain lubrication?
Publish Time: 2024-12-11
The outer spherical bearing plays a key role in many mechanical operation scenarios. Its excellent sealing design can accurately prevent impurities from entering and maintain a good lubrication state. This ensures the efficient and stable operation of the bearing.
The sealing structure of the outer spherical bearing usually uses a variety of sealing elements to work together. Common ones are rubber seals, whose materials have good elasticity and wear resistance. The seal fits tightly between the inner and outer rings of the bearing to form a reliable barrier. In terms of design, the inner and outer diameters of the seal are precisely calculated and processed to ensure that the fit with the bearing is just right, neither too loose to allow impurities to enter easily, nor too tight to affect the normal rotation of the bearing. For example, in some dusty industrial environments, the seal can effectively block tiny metal particles, sand and dust and other impurities, preventing them from entering the bearing and destroying the precision matching surface between the ball and the raceway.
In addition, some outer spherical bearings are also equipped with a double-lip sealing structure. A sealing cavity is formed between the lips, and the cavity is filled with an appropriate amount of grease. This design not only enhances the sealing effect, but also plays a good role in lubrication retention. The inner lip mainly prevents the grease inside the bearing from leaking, while the outer lip blocks the intrusion of external impurities. Moreover, the lip shape and contact pressure of the double lips are carefully designed and can be adaptively adjusted according to the operating conditions such as the bearing speed and operating temperature. When running at high speed, the lip can maintain a proper fit to prevent the grease from being thrown out and impurities from entering due to centrifugal force; in a low temperature environment, it can still maintain good elasticity and sealing performance to ensure that the viscosity and fluidity of the grease are not greatly affected, thereby accurately providing continuous and stable lubrication for the bearing.
Furthermore, the seal of the outer spherical bearing is integrated with the overall structural design of the bearing, taking into account the characteristics of different installation methods and use environments. For example, for some equipment that requires frequent disassembly and maintenance, the seal design facilitates quick installation and disassembly, while ensuring the reliability of the seal after each reinstallation. In some humid or corrosive environments, the seal material will be selected from rubber or composite materials with corrosion resistance, and a protective coating or special sealing lip will be added to the sealing structure to more accurately resist the erosion of corrosive substances such as moisture, acid and alkali, extend the service life of the bearing, and enable it to maintain precise sealing and lubrication performance under various harsh working conditions, thereby safeguarding the stable operation of mechanical equipment.
