Custom slew bearing for Spain customer
Custom slew bearing for UnitedKingdom customer
Slew bearing for Brazll customer
Slewing bearings exported to Russla
Slewing bearings for UnitedStates customer
Slewing ring exported to Southeast Asia
Slewing ring exported to Southwest Asia
Slewing ring exported to North America
Slewing ring exported to South America
Slewing ring exported to South Africa
Slew bearing for India customer
Slew bearing for Latin America customer
Slewing bearing for Türkiye customer
Slewing bearing for Uzbekistan customer
Slewing ring exported to South Korea
Slewing ring exported to Mexico
Custom slew bearing for Mexico customer
Custom slew bearing for Italy customer
Custom slew bearing for Vietnam customer
Slewing bearing for Europe customer
Product Introduction
As a premier manufacturer in China with a dedicated focus on large-diameter rotary interfaces, we have engineered the QNA series to meet the rigorous demands of modern wind turbines and offshore vessels. Unlike single-row designs, the QNA series utilizes a double-row four-point contact ball structure. This robust architecture allows the bearing to handle significantly higher axial, radial, and tilting moment loads simultaneously, making it the preferred choice for critical pivot points where failure is not an option.
Understanding the QNA Architecture
The "QNA" designation represents a specific class of double-row four-point contact ball slewing rings. The core innovation lies in its two independent rows of balls, each arranged in a four-point contact geometry.
Here is what sets this design apart:
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Dual-Row Redundancy: By distributing loads across two rows of balls, the QNA series achieves a load capacity far superior to single-row equivalents of the same diameter. This is critical for managing the unpredictable dynamic loads found in wind turbine yaw and pitch systems.
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Optimized Load Distribution: The four-point contact angle ensures that whether the force is pushing down, pulling up, or trying to tilt the structure, the bearing responds with uniform stiffness.
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Monolithic vs. Segmented Options: Depending on the diameter (often ranging from 1 meter to over 4 meters), we offer both solid and segmented outer rings to facilitate transport and installation on-site without compromising structural integrity.
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Integrated Gear Profiles: Most QNA models feature precisely cut external gear teeth on the outer ring, designed to mesh seamlessly with high-torque hydraulic or electric drives used in heavy machinery.
Primary Applications: Where Strength Meets Precision
The QNA type slewing ring is the backbone of some of the world's largest machines. Our clients deploy these bearings in:
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Wind Energy: The definitive choice for wind turbine yaw bearings (rotating the nacelle) and pitch bearings (adjusting blade angles). Their ability to handle huge overturning moments makes them indispensable for multi-megawatt turbines.
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Offshore & Marine Cranes: Used in the rotation mechanisms of pedestal cranes on oil rigs, supply vessels, and floating production units where stability in rough seas is paramount.
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Heavy Construction Equipment: Ideal for the upper structures of large crawler cranes, tower cranes, and tunnel boring machines (TBMs) that require massive torque transmission.
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Port & Logistics: Found in ship-to-shore (STS) cranes and large-scale container handlers that operate continuously under heavy loads.
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Defense & Radar: Supports large surveillance radar arrays and naval gun turrets that require smooth rotation despite significant weight and wind exposure.
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