Tower/Mobile/Deck Crane Roller or Ball Type Slewing Ring Bearing

Slewing Bearing Definition

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).

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.

Slewing Bearing Transportation 

Normally we have structure for slewing bearings as below:

Single-row four point contact ball slewing bearingsSingle 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 Bearings Main Applications

Please click the below application name you need for further detail information.

Slewing Bearings for Excavator

DRE 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 & offshoreBecause 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 and can accept the inspection such as DNV, GL and others.

Slewing Bearings for Wind TurbinesWind 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 

DRE 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.

Slewing ring refurbishment  

Slewing ring refurbishment can offer significant savings when compared to a replacement slewing ring. Repair or refurbishment is usually only economic on slewing ring with large bore size and depends on the degree of wear or damage. Repair on smaller slewing rings is possible, but only becomes economic on larger batch sizes.
 

Certain types of damage are easy to repair, such as minor surface scuffing or light staining. Moderate surface conditions, such as corrosion, indentation of fine spalling, and more difficult tpo repair and will probably require raceway grinding. Also some bad condition we have to change the rollers/balls and cage, re-grinding on the raceway and surface. It all depends on the status of the slewing rings.

 

So if you want to repair on your slewing ring, please contact with us to show the condition of the slewing rings and better the photos to let us check if can be repaired and give you the repair suggestion on this.

Forged Rings for Slewing Rings We can also provide Forged Rings for Slewing Rings .The hardness is tested by Brinell Apparatus (HBW10/3000). The Brinell Apparatus may bring a depression in the surface of the forged rings.

We determine the hardness according to the diameter of depression in the forged rings.

Production Show



Test Reports and Certifications

every step of processing from raw material to packaging is controled strictly. Slewing bearing test report will be sent with commercial invoice/packing list and other documents to customer directly. 

DRE Customer Reference



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