As a premier manufacturer specializing in slewing bearings, we offer high-performance slewing ring bearings engineered specifically for wind turbine applications. Designed to withstand the extreme operational demands of wind energy systems, these bearings provide critical support for rotor blades and nacelle orientation.
Manufactured from high-strength forged rings and incorporating advanced heat treatment processes, our wind turbine slewing bearings ensure exceptional durability and resistance to fatigue under fluctuating loads and harsh environmental conditions. They feature high-precision gear teeth options (hardened and ground), integrated sealing systems for contamination protection, and customized lubrication holes to ensure reliable long-term performance.
Available in single-row four-point contact ball, double-row ball, and three-row roller configurations, our solutions meet the stringent requirements for yaw and pitch control, delivering high running accuracy, low friction torque, and extended maintenance intervals. We adhere to strict international quality standards (ISO 9001) to guarantee seamless integration and optimal performance in both onshore and offshore wind turbine installations.
Technical Specifications: Wind Turbine Slewing Bearings (Pitch & Yaw)
| Parameter | Pitch Bearing (Blade Adjustment) | Yaw Bearing (Nacelle Orientation) |
|---|---|---|
| Bearing Type | Single Row Four-Point Contact Ball Bearing | Single Row Four-Point Contact Ball / Cross Roller |
| Common Diameter Range | φ1,500 – φ3,500 mm | φ2,500 – φ4,500 mm |
| Main Material | Alloy Steel 42CrMo / 42CrMo4 | Alloy Steel 42CrMo / 42CrMo4 |
| Heat Treatment | Induction Hardened (Raceway) | Induction Hardened (Raceway) |
| Hardness (Raceway) | HRC 55 – 62 | HRC 55 – 62 |
| Gear Option | Internal / External Spur Gear (Optional) | Internal / External Spur Gear (Optional) |
| Gear Module | 12 – 20 mm (Depending on load) | 16 – 25 mm (Depending on load) |
| Clearance | Preloaded (Negative clearance) for high rigidity | Preloaded (Negative clearance) |
| Sealing | Double Lip Seals (High protection against moisture/debris) | Double Lip Seals |
| Lubrication | Grease points with distribution holes | Grease points with distribution holes |
| Static Load Capacity (Coa) | High (Designed for extreme wind loads) | Very High (Supports entire rotor & nacelle weight) |
| Surface Protection | Zinc-rich primer / Anti-corrosion coating | Zinc-rich primer / Anti-corrosion coating |
Q1: In which parts of a wind turbine are slewing bearings used, and what specific functions do they perform?
A: They are primarily used in the yaw system and the pitch system. The yaw bearing connects the nacelle to the tower, allowing the nacelle to orient itself toward the wind; the pitch bearing connects the blade to the hub, adjusting the blade angle to control rotor speed and power output.
A: Typically, 42CrMo or an equivalent alloy steel is used. The material undergoes quenching and tempering treatment, followed by medium-frequency induction hardening of the raceway surfaces. This process achieves a hardness of HRC 55–62 and ensures a sufficient hardened layer depth to guarantee resistance to fatigue and wear.
A: A "soft zone" is an unhardened region formed at the interface of the heat treatment process. During installation, the soft zones on the inner and outer rings must be staggered relative to each other and positioned within a non-primary load-bearing area to prevent premature failure at points of maximum stress.
A: The key lies in regularly applying specialized grease (formulated for low-speed, heavy-load, and anti-corrosion applications), checking the bolt preload every 500 hours, and promptly replacing aging seals to prevent contaminants from entering the raceways.