Slewing bearings are extremely important in today's heavy industry large bearing diameter ranging from 10cm to 10 meters, almost all of the large equipment reciprocating circular motion is essential, it is able to withstand a large-scale integrated load bearing, can bear large axial, radial load and overturning moment. Slewing ring bearings are generally installed with a hole, the internal gear or the external gear, lubricants holes and sealing devices, which enable the host compact design, the guide is simple, easy to maintain. Slewing bearings commonly used classification of a single row of five four-point angular contact ball slewing bearings, Single row crossed roller slewing bearing, double-row ball slewing bearing, three-row roller combination slewing bearings and slewing bearings light. Slewing ring bearings are widely used for lifting machinery, mining machinery, construction machinery, port machinery, ship equipment and high-precision radar and missile launchers and other mechanical equipment of large rotary device. But also according to the user's specific requirements and design, development and production of special structures slewing ring bearings.
Bearing is the other parts on the shaft will produce relative motion, used to reduce friction coefficient during power transmission and keep the machine shaft center fixed position, its main function is to support the rotary body, in order to reduce the equipment in the transmission process of mechanical load friction coefficient. According to the motion of the frictional properties of different components, bearings can be divided into two types of rolling bearings and sliding bearings.
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