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Dalian Running Engineering Co., Ltd.

Wind Mill Bearing, Wind Mill Slewing Bearing, Wind Mill Slewing Ring manufacturer / supplier in China, offering Slewing Ring Bearings for Wind Turbines Yaw Bearing Pitch Bearing, High Precise Preload Cross Roller Bearings, Light Weight Series Thin Section Slewing Ring Bearings and so on.

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Supplier Homepage Product Slewing Bearing Slewing Bearing Type Slewing Ring Bearings for Wind Turbines Yaw Bearing Pitch Bearing

Slewing Ring Bearings for Wind Turbines Yaw Bearing Pitch Bearing

FOB Price: US $100-5,000 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $100-5,000/ Piece
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Port: Shanghai, China
Production Capacity: 500 Piece/Pieces Per Day
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

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Basic Info
  • Rolling Body: Ball Bearings
  • Outer Dimension: Small and Medium-Sized (60-115mm)
  • Spherical: Aligning Bearings
  • Separated: Unseparated
  • Bore Size: 80-5000mm
  • Warranty: 12 Months
  • Normalizing Hardness: 206hb-262hb
  • Recaway Hardness: HRC 55-62
  • Rolling Element: Roller
  • Transport Package: Water-Proof Packing Then in Wooden Cases
  • Origin: Liaoning, China (Mainland)
  • The Number of Rows: Single
  • Material: Manganese, Chrome Molybdenum
  • Load Direction: Radial Bearing
  • Feature: External Gear
  • Outside Diameter: 100-5000mm
  • Seals Type: NBR
  • Quench&Temper Hardness: 229hb-269hb
  • Quenched Teeth Hardness: HRC 55+-5
  • Trademark: DRE
  • Specification: 113, 114
  • HS Code: 848340900
Product Description

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 . 



Single-row four contact ball slewing ring reference number

Double-row ball slewing ring reference number




Technique Requirement

1, Material and heat Treatment

 Rolling elements in yaw and pitch bearing are usually made of GCr15 or GCr5SiMn according to GB/T18254-2002.The heat treatment should comply with JB/T 1255-2001.Other materials with similar or better properties can also be used.

 The material of rings in yaw and pitch bearing is 42CrMo or others that meets technique requirement according to GB/T3077-1999.. The value of notched bar impact work shall be  no less than 27J at -40ºC.

Rings of yaw and pitch bearing should be applied magnetic particle testing with requirement

Stricter than grade II according to GB/T 7736-2001.Hardness after hardening and quenching should be 229HB~269HB,for raceway after quenching 55HRC~62HRC.The effect hardened thickness of raceway should meet the requirement  in Table 4.Also ,it can be calculated  according to the loads on the bearing.

Table 4 Raceway effect hardened thickness Ds

Note: Ds is the depth of groove surface with hardness ≥48HRC

2, Gear in yaw and pitch bearing

Gear in yaw and pitch bearing usually is in volute cylindrical gear with radial modification coefficient x=+0.5 or other values according to different requirements. Gear modulus should meet GB/T1357-1987.Gear precision should be no lower than 998GK OF GB/T 10095.1-2001 and GB/T10095.2-2001.

3, Tolerance and clearance

Generally radial and axial clearance of yaw bearing is 0~50 µm.

They can be adjusted according to customer requirement.

Radial and axial clearance of  pitch  bearing is less than 0.

Tolerance of yaw and pitch bearing is listed in table 5.

Table 5 Dimension Tolerance  unit:µm

da or Da△Ts△db△Db   
Tolerance Grade
>0,6, 5065065
a△Ts,△ds according to d, △Ds according to D
b For non positioning diameter, △ds,△Ds shall be H12 or h12


Table 6  Rotating Precision   unit:µm

da or DaSia,SeaKia,KeaFira ,Frea       
Tolerance Grade          


4, Seal

For yaw and pitch bearing, seal material should be NBR according to HG/T2811-1996 or better material.

We use world famous seals with good propertied and reliable quality for our pitch and yaw bearing.

5, Spacer and cage

Yaw bearing of our company has spacers that are self-lubricated, so best lubrication status between ball and groove contact areas could be maintain no matter whether the lubrication is evenly or unevenly distributed.

Our pitch bearing uses integrated steel cage which has simple structure and can save space and contain more balls to increase load capacity. Compared with traditional segmented cage, integrated cage is not only easier to assemble, but also more stable and reliable.

6, Anti-corrosion treatment

For yaw and pitch bearing, except for groove and gear , other surfaces should be  applied spraying anti-corrosion treatment according to GB/T9793-1997 and GB/T8427-1996 .When applied zinc coating , the thickness of anti-corrosion should be no less than 160µm. Other treatment can also be applied if it meets performance requirements of the machine

7, Other requirement

 If there are other special requirement, please contact with us.

Process Flow

Some factory photos to make you know more about us.
Slewing Ring Bearings for Wind Turbines Yaw Bearing Pitch Bearing


Know More About Our Company

Brief Introduction

Our company is establisted in 1998.We supplied excellent product and service to every user.We have gained ISO9001 certificate for our control of quality. We are specialized in slewing bearing, slew drive, gears and other medium and large size bearing.We can provide our customerss with exact, suitable, economic products also the technical services.Our company website address is


Contact Info:
Joyce Wang
Export Sales
DRE Engineering Co., Ltd
Tel: 0086-411-84618155
Fax: 0086-411-84633077



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