Slewing Bearing → Four-Point Contact Ball Slewing

Slewing bearing is a new type of mechanical parts in recent forty years rise in the world, it has inner and outer ring, a rolling body, etc. at present, our country type slewing bearing production, mainly from the beginning of 80s designated the Ministry of machinery industry Tianjin Mechanical Engineering Research Institute to organize the introduction of design and manufacturing technology of Rothe Erde, the former Federal Republic of germany. In December 20, 1984 People's Republic of China issued standard of Ministry of machinery industry: JB/2300-84 "slewing bearing types, basic parameters and technical requirements", mainly by the Ministry of machinery and electronics industry of Tianjin Engineering Machinery Research Institute, Xuzhou Hailin bearing factory is responsible for drafting, and later released in 1991 the national construction machinery standard: JB36.1-36.3-91, in 1999 and 2011 has released the machinery industry standard the new JB/2300-1999 and JB/2300-2011.

Slewing bearing is a kind of large bearing which can bear comprehensive load. It can bear large axial, radial load and overturning moment at the same time. Slewing bearing generally has mounting hole, internal gear or external gear, lubricating oil hole and sealing device, so that the main structure of the design is compact, easy to guide and easy to maintain. Slewing bearing without gear teeth type, four point contact ball bearing, external gear and internal gear type double row angular contact ball bearing cross cylindrical roller bearing, crossed tapered roller bearing and three row cylindrical roller bearing composite four series, including four point contact ball bearing with high static load capacity of cylindrical cross the roller has a high load capacity, crossed tapered roller bearing preloaded can make bearings with greater support stiffness and rotation accuracy, three row cylindrical roller combined bearings due to highly improve the bearing capacity of the various forces, respectively by different rolling bearing, so the same under the condition of stress, the bearing diameter greatly so it is reduced, so that the host features more compact is a slewing bearing with high bearing capacity. Slewing bearing is widely used in lifting equipment, mining machinery, construction machinery, port machinery, marine machinery and high precision radar machinery and missile launcher and other large rotating equipment. At the same time, according to the specific requirements of the user, design, development, production of a variety of special structure slewing bearing.

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