What is three row roller slewing bearing

The three row roller slewing bearing is a composite radial and thrust cylindrical roller bearing with a single ring and a double ring, which can carry high loads. This type of LTZC bearing has no preload and an integral lip seal. This bearing has high requirements for the seat cushion.

The components of the three row cylindrical roller combination slewing bearing mainly include: outer ring, inner ring, isolation block, cage, three row rollers, sealing device, etc. According to the structure, it can be divided into three types: external teeth, toothless teeth, and internal teeth. This combination bearing is more suitable for use in mechanical equipment with low friction requirements, large radial load, large axial load, and overturning torque.

The three row cylindrical roller combination slewing bearing reduces the load on each roller compared to the cross cylindrical roller slewing bearing, and changes from point contact to line contact compared to the double row diameter ball slewing bearing, reducing contact stress.

Features of three row roller slewing bearing:

Three row cylindrical roller slewing bearings can simultaneously withstand axial load, radial load, and overturning torque. The bearing capacity is high under the same external dimensions, as its axial and radial loads are borne by different rollers. The radial load is borne by rollers placed vertically along the axis, while the axial load and overturning moment are borne by two sets of rollers placed horizontally along the axis. Because under the same force conditions, different raceways and rollers bear the load, reducing the diameter of the bearing in a large range, making the host more compact. So the three row cylindrical roller combination rotary table bearing is a high load-bearing capacity rotary table bearing.

Material of three row cylindrical roller rotary support bearing 

The rolling element of the three row cylindrical roller slewing bearing is generally made of GCr15 or GCr15SiMn bearing steel, and the material can be rod material or forged parts, mainly determined by the operating conditions and the size of the rolling element. The hardness of the rolling element is generally 58-62HRC, and the roller can be selected as a 2-grade rolling element with convexity.

The material for the cage (isolation block) of the three row cylindrical roller slewing bearing is generally nylon PA66, and materials such as steel, brass, and aluminum alloy can also be used.

The sealing materials for the three row cylindrical roller slewing bearings are generally made of nitrile rubber or fluororubber, and it can be decided whether to install a labyrinth type ash baffle as needed.

The surface treatment of three row cylindrical roller rotary table bearings is usually done with lubricating oil to prevent rust. Depending on the usage, the surface can be treated with anti-corrosion treatment. Currently, the surface treatment methods used for rotary table bearings include phosphating, zinc spraying, and painting.

The three row cylindrical roller slewing bearing (slewing support) structure bearing is suitable for situations with large axial load and overturning torque, large radial load, and low friction torque requirements.

Application of  three row roller slewing bearing

Three row roller type slewing bearings are used in machinery such as bucket wheel excavators, wheel cranes, marine cranes, port cranes, steel and water transportation turntables, and large tonnage truck cranes.