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|
|Production Capacity:||500 Piece/Pieces Per Day|
|Payment Terms:||L/C, T/T, D/P, Western Union, Paypal, Money Gram|
- 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
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
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||△d||b||△D||b|
|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 Da||Sia,Sea||Kia,Kea||Fira ,Frea|
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.
Some factory photos to make you know more about us.
Know More About Our Company
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 www.dlrtr.com.
DRE Engineering Co., Ltd