Double Row Ball Slewing Bearings

The double row ball slewing bearing has three seat rings. The steel balls and isolators can be directly arranged into the upper and lower raceways. Under stress conditions, the upper and lower rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient. The bearing angle of the upper and lower arc raceway is 75 degrees. It can bear a great deal of axial force and overturning moment. The raceway must be specially designed when the radial force is more significant than 0.1 times the axial force. The axial and radial dimensions of the double row ball slewing bearing are relatively large, and the structure is fastened. It is especially suitable for handling tower cranes, truck cranes, and other loading machines that require medium or above diameters and military products.

Characteristic of structure, performance

Double row ball slewing bearing has three seat ring, the steel ball and the spacing block can be directly arranged into the upper and lower races, and two rows of upper and lower steel balls with different diameters are fitted according to the stress condition.
This kind of open assembly is very convenient, for the upper and lower bear raceway arc angles is 90°, which can bear large axial forces and tilting moment. When the radial force is more significant than 0.1, the axial force must be specially designed for the raceway.
Double row ball slewing bearing's axial and radial size are relatively large and solid in structure. It is especially suitable for the medium diameter tower cranes, truck-mounted cranes, etc., loading and unloading machinery.

The basic structures of double row ball slewing bearing are as below:

(1) External gear

(2) Internal gear

Product parameters

(1) Model and size parameters of external gear double-row ball slewing bearing

(2) Internal gear double-row ball slewing bearing model size parameters

Application of double row ball slewing bearing

Double row slewing bearing is mainly used for wind turbine electrical equipment and concrete transportation pump trucks. In wind power equipment, the path is installed at the root of the propeller to act as a side propeller. The clearance must be zero or negative, and the starting friction torque is tremendous and with high rotation accuracy. In terms of its characteristics, this bearing has a compact structure, effectively saving the center diameter of the inner and outer ring mounting holes and improving the load-bearing capacity.

1. Wind turbine

The yaw and pitch bearing ring material are 42CrMo, the heat treatment adopts the overall quenching and tempering treatment, and the raceway surface is quenched. The force of yaw and pitch bearings is complex, and the impact and vibration are relatively significant. Therefore, the bearing is required to withstand both impact and large load. The life of the wind turbine main engine is 20 years, and the cost of bearing installation is relatively high. Therefore, the life of the yaw and pitch bearings must also reach 20 years. The hardness of the bearing ring matrix is ​​240-280HB, which can withstand impact without plastic deformation. At the same time, the surface quenching hardness of the raceway reaches 55-62HRC, which can increase the contact fatigue life and ensure the long life of the bearing.

2. Tower crane

The slewing bearing for the tower crane usually adopts a small four-point contact or double-row ball slewing bearing with a diameter of no more than 2 meters.

Company Information

We are a professional manufacturer and supplier of slewing bearings; We make all kinds of slewing bearings, such as four-point contact ball slewing bearings, single row cross roller slewing bearings, double-row ball slewing bearings, three-row roller slewing bearings, flange slewing bearings, light series slewing bearing. We are capable of designing and manufacturing non-standard slewing bearings independently. Our products are widely used in various applications, such as port, ship, vehicle, mining, engineering, lifting, environmental protection, oil, chemicals, light industry, metallurgical machinery, the military, etc. With eight years of experience, our products are widely exported to the United States, Germany, Japan, Spain, Canada, Italy, France, Finland, South Korea, India, Singapore, Brazil, Australia, and other countries. If you need slewing bearing, please feel free to contact us.

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