The ins & outs of slewing bearing

Slewing bearing is also known as rotary disc bearing, or slewing bearing, as some people call it. Slewing bearing or slewing ring bearing or turntable bearing. This article focuses on the ins & outs of slewing bearing. 

Here are the main points of the article:

• A brief introduction to slewing bearing

• The basic structure of slewing bearing

• The application of slewing bearing

1. A brief introduction to slewing bearing

Slewing bearing is a new type of mechanical parts that has gradually emerged in the world in the past 40 years.  It consists of internal and external circles and rolling bodies, etc.  The slewing bearing that has been shaped for production in China mainly refers to the design and manufacturing technology of the former federal republic of Germany Rothe Erde company, which was organized by tianjin engineering machinery research institute designated by the ministry of machinery industry in the early 1980s. Released on December 20, 1984 of the People's Republic of China machinery industry standard: JB / 2300-84 the slewing bearing type, basic parameters and technical requirements, composed mainly of machinery and electronics industry of tianjin engineering machinery research institute, xuzhou hering slewing bearing factory is responsible for drafting, the country then issued standard of construction machinery in 1991: JB36. 1-36. 3-91, released in 1999 and 2011 successively new machinery industry standard JB / 2300-1999 and JB / 2300-2011. 

Slewing bearing is a large bearing capable of bearing comprehensive loads and bearing large axial, radial loads and overturning moments at the same time. Slewing bearing generally has mounting holes, internal or external gears, lubricating oil holes, and seals, which results in compact design, easy guidance, and easy maintenance of the main engine. Slewing bearing presence of tooth, tooth and tooth in the four-point contact ball bearing, double row angular contact ball bearing, crossed cylindrical roller bearing, crossed tapered roller bearing and three composite bearings, four row cylindrical roller series, including four-point contact ball bearing has high static load capacity, crossed cylindrical roller with high load capacity, preloaded can make crossed tapered roller bearing of the bearing has great support stiffness and the rotation accuracy, three rows of cylindrical roller bearing combination height because of the increase to the bearing capacity of bearing, all kinds of power respectively by different race to bear, so under the same stress distribution,The bearing diameter can be greatly reduced and thus has the characteristic of making the main engine more compact with a high bearing capacity of slewing bearing. Slewing bearing is widely used in cranes, mining machinery, construction machinery, port machinery, ship machinery and equipment, as well as high-precision radar machinery and missile launchers and other large rotary devices. slewing bearing can also be designed, developed and produced according to users' specific requirements. 

2. The basic structure of slewing bearing

The rotary drive is usually composed of worm, slewing bearing, housing and motor. Since the core component USES slewing bearing, it can bear axial force, radial force and tipping moment at the same time. It has many forms, but its structure and composition are basically the same. 

From left and right are (the upper part) :

1.Outer ring (toothed or toothless) 2.  Sealing belt 3.  Rolling body (ball or roller) 4.  Refueling nozzle

From left and right are (the following part) :

1.Plug 2.  Plug pin 3.  Inner ring (with or without teeth) 4.  Isolation block or cage 5.  Mounting hole (silk hole or light hole)

3. The application of slewing bearing

Slewing bearing in the real industrial application is very extensive, known as: "machine joints", its main applications are widely used in: crane, rail crane, port cranes, deck cranes, metallurgical cranes, container cranes, excavators, filling machine, and CT machine standing wave therapy apparatus, navigation, radar antenna tower, missile launcher, tanks and robots, and a revolving restaurant, etc. 

I hope the introduction of this article has helped you understand slewing bearing.  If you need slewing bearing, please contact us.