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Product Description​
Slewing bearing is a large bearing with special configuration, which can endure biggest multiply load, such as axial&radial load, overturning moment, etc.

Slewing Ring Structure
Slewing ring is composed of outer ring (teeth or non-teeth),rolling element(steel ball, cylindrical roller, tapered roller), cage, inner ring(teeth or non-teeth) and seals (the one with sealed structure).

Normally we have structure for slewing bearings as below:
Single-row four point contact ball slewing bearings
Single Row Cross Roller Slewing Ring Bearings 
Double-row ball slewing bearings 
Three-row Roller Slewing Ring Bearings
Accept custom making according to drawing or requirment.

Slewing Bearing Function
Slewing bearing itself is featured in compact structure, convenient lead to slew, easy for installation&maintenance, which is widely used as slewing set in the fields of heavy machine, slewing platform in the steelworks, excavator grab, material taking&stacking set, material traveler, harbor machine, missile lauching cage,CT set, etc.

Materials for Slewing Bearing
1) Rings: Bearing steel,*0Mn and *2CrMo are usually used.

2) Rolling element: It is made of chrome steel GCr*5 or GCr*5SiMn.

3) Seal: It is usually made of NBR,iron,felt,or other thing which meet the capability.

4) Hardness: Normalizing hardness of the rings is **7HB***1HB, quench & temper hardness is **9HB***9HB, hardness of the raceway after quenching is *5HRC**2HRC.

Slewing Bearing Transportation 
Delivery:   Stock product in 7 days
            Standard product in *0 days
            Custom product in ****0 days
Package: Wooden case or as your request.

Accept custom making according to drawing or requirment.

Slewing Bearings Main Applications

Slewing Bearings for Excavator
LDB supplies the slewing rings to a wide range of the excavators, a good replacement of excavator slewing ring bearings used on Komatsu, Hitachi, Kobelco, Caterpillar, Hyundai and so on, we can supply according to the most of the machine number, and a lot of slewing rings are in stock for the quick delivery.

Slewing Bearings for Cranes
Because of the light structure of the crane, slewing ring bearing is an essential and strategic part. Our slewing rings are widely used in kinds of cranes, such as tower cranes, ship deck cranes, mobile cranes, railway cranes and so on.

Slewing Bearings for ship & offshore
Because of the special condition for the slewing rings used for the offshore, we have special strong design on the sealing system and the surface protection. Our specific design satisfy the main manufacturers of the on board and harbour cranes, winches, davits and rubber tired gantry cranes as well as propellers.

All our slewing bearings follows the international certification standards.

Slewing Bearings for Wind Turbines
Wind Turbines Slewing ring bearings can be classified into three types: the yaw bearing, pitch or blade bearing, driving system bearing (spindle bearings and gearbox bearing).

The yaw bearings install into the joint between tower and cabin, the pitch bearing installed into the joint between the blades and hubs. Each wind turbine has a set of yaw bearing and three sets of pitch bearing.

Structure of Yaw and Pitch Bearing
Generally, the structure of yaw and pitch bearings is single row ball slewing ring four-point contact bearing and double row ball slewing ring four-point contact bearing. and both these two types can be further divided into bearings without gears, bearings with internal gears ,bearings with outer gears according to gear position . 

Fastening Bolts for Slewing Bearings 
LDB can supply the fastening bolts for the slewing ring bearings for mounting. We can produce as customer requirements. Normally the bolts can use the same material as the slewing ring bearings, or also can use others as requires. And we can produce the match pinion of slewing rings according to the spec if customers purchase pinion together with slewing bearings.



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If you have any question about our products and technical details, please feel free to contact me!


Contact Info:
Tong Yongzhong (Tony)  Manager Director 
LUOYANG LONGDA BEARING CO.,LTD. 
sales#ldb-bearing.com