Double-row ball slewing ring (02 series)-gearless

Structural features, functions, scope of application

The double-row ball slewing bearing has three seats, and the steel balls and blocking blocks can be directly discharged into the upper and lower raceways. According to the force, the upper and lower rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient. The load-bearing angles of the upper and lower arc raceways are both 90°, which can accept large axial forces and tipping moments. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The double-row ball slewing bearing produced by worm gear manufacturers has relatively large axial and radial dimensions and a firm structure. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.

In the failure of the slewing ring, the raceway damage accounts for 98%. The quality of the raceway has become the core issue of the slewing ring. There are many factors that affect the quality of the slewing ring. The carrying capacity and service life.

Determine the key factor of the bearing quality of the slewing ring. Factor 1. Hardness of the slewing ring raceway The quenching hardness of the slewing ring raceway has a greater impact on its extra static capacity. If the extra static capacity of HRC55 is used as specification 1, the hardness of the raceway has a strict correspondence with the extra static capacity. The standard low hardness is HRC55, and the general practice uniform quenching hardness is around HRC57. Insufficient hardness can easily cause the slewing bearing to fail, starting from the pitting of the raceway surface to the completion of the collapse.