Double-row ball slewing ring with same diameter balls is usually used for wind driven generators and concrete pump trucks, Excavator, Crawler crane, Port machinery, Amusement facilities. In wind driven generator applications, double-row ball slewing ring is often installed at the bottom of propellers for variable pitch control which requires zero clearance, large start friction moment and high running accuracy.
Outer diameter: 704mm~4395mm
Ball diameter: 25mm~60mm

With compact construction, the double-row ball slewing ring bearing decreases the diameter of mounting holes in the inner and outer ring and increases the loading capacity.

Double-row ball slewing ring bearing usually comprises 3 rings, steel balls and spacers can enter the upper and lower raceways directly. Two sets of steel ball are placed based on the force analysis. With such configuration, the 90° bearing angles of the upper and lower arc raceway enable the bearing to take large axial force and tilting moment. Special design is needed for the raceway when the radial force is greater than one tenth axial force.

Double-row ball slewing ring bearing details
Range of external diameter: 100 mm to 15000 mm
Ring material: 42CrMo / 50Mn/ C45
Ball/roller material: GCr15
Cage material: steel 20 or ZL102 cast aluminum alloy
Spacer material: nylon 6 / nylon 66
Quenching hardness of raceway: HRC55-62
Tooth type: no gear, internal gear, external gear

Three types of double-row ball slewing ring bearing

Double-row Ball Slewing Ring with Same Diameter Balls, with Internal Gear
Double-row Ball Slewing Ring with Same Diameter Balls, with External Gear
Double-row Ball Slewing Ring with Same Diameter Balls, with No Gear

Tag: