What is double row ball slewing bearing

Double row ball slewing bearing are commonly used in wind turbines and concrete pump trucks. In the application of wind turbines, double row ball slewing bearing are often installed at the bottom of the propeller for variable pitch control, requiring zero clearance, large starting friction torque, and high operating accuracy.

The double row ball slewing bearing has a compact structure, reducing the diameter of the inner and outer ring installation holes and improving the load-bearing capacity.

The double row ball slewing bearing support is usually composed of three rings, and the steel ball and spacer can directly enter the upper and lower raceways. Place two sets of steel balls according to the force analysis. Using this structure, the 90 ° bearing angle of the upper and lower arc raceways allows the bearing to withstand significant axial forces and overturning moments. When the radial force is greater than one tenth of the axial force, the raceway requires special design.

Features of double row ball slewing bearing

The surface of the double row ball rotary table bearing raceway has undergone quenching treatment, with a quenching hardness of HRC55-62, ensuring its effective hardening depth.

Due to the need to transmit force, slewing bearing usually have teeth on one of the rings. The tooth shape is generally normalized or tempered. Depending on the application, gears can also undergo full tooth quenching or single tooth induction quenching. Single tooth induction quenching can be divided into full tooth quenching and tooth foot (side and base) quenching.

The slewing bearing can meet the needs of the working host under various load conditions according to different structural characteristics. Among them, the four point contact ball slewing bearing has high dynamic load capacity. The bearing capacity of double row ball slewing bearing is much higher than that of single row ball slewing bearing. Cross cylindrical slewing bearing has high static load capacity. Slewing bearing has the ability to withstand axial and radial loads as well as overturning torque.

The inner or outer rings of the double row ball slewing bearing have integral and split structures. The rigidity of the integral ring of the double row ball slewing bearing is relatively strong, and the split type adjustment is convenient. The split type structure has been connected together by bolts before the product leaves the factory. Double row ball slewing bearings usually have a cage (or isolation block), and only when the load is large, a fully loaded ball structure is used. The fully loaded ball bearing has a large load-bearing capacity, but it has high frictional resistance, and friction can easily cause scratches on the surface of the steel ball.

Material of double row ball slewing bearing

Ball diameter: 25mm~60mm

Outer diameter range: 100mm to 15000mm

Ring material: 42CrMo/50Mn/C45

Ball/roller material: GCr15

Cage material: 20 steel or ZL102 cast aluminum alloy

Gasket material: nylon 6/nylon 66

Hardening hardness of raceway: HRC55-62

Tooth type: no teeth, inner teeth, outer teeth

The surface of the bearing raceway has undergone quenching treatment, with a quenching hardness of HRC55-62, ensuring its effective hardening depth.

Application of double row ball slewing bearing

The double row ball slewing bearing itself is equipped with installation holes, lubricating oil, and sealing devices, which can meet the different needs of various hosts working under different working conditions; On the other hand, the double row ball slewing bearing itself has the characteristics of compact structure, convenient guiding rotation, easy installation and maintenance, and is widely used in large slewing devices such as lifting and transportation machinery, mining machines, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launchers.

Supplier of double row ball slewing bearing

LZTC double row ball slewing bearing, providing a series of services such as research and development, design, production, and sales of double row ball slewing bearing products. If you are looking for double row ball slewing bearing supplier, please contact us for the latest quotation.

LTZC Bearing is a professional slewing bearing manufacture with following main Products. Slewing Bearing, Large Size Non-standard Precision Bearing, Ladle Turret Slewing Bearing Shield machine bearing series, Rolling Mill Bearing.

The main products of LTZC BEARING are slewing bearing, non-standard precision bearing, rolling mill bearing, unit assembly related to bearing, Oversize Precision Rail. The product processing range is outer diameter: 200 mm - middle 10000 mm.