Internal Gear Single-Row Four-Point Contact Ball Slewing Bearing

Internal Gear Single-Row Four-Point Contact Ball Slewing Bearing
Internal Gear Single-Row Four-Point Contact Ball Slewing BearingInternal Gear Single-Row Four-Point Contact Ball Slewing BearingInternal Gear Single-Row Four-Point Contact Ball Slewing BearingInternal Gear Single-Row Four-Point Contact Ball Slewing BearingInternal Gear Single-Row Four-Point Contact Ball Slewing Bearing
    In heavy machinery and precision automation, real estate is often the most valuable commodity. When design engineers are squeezed by tight envelope constraints but still need to transmit massive torque, the Internal Gear Single-Row Four-Point Contact Ball Slewing Bearing emerges as the optimal solution. Unlike external gear variants that require additional radial clearance for pinion access, our internal gear series tucks the drive mechanism inside the bearing’s diameter, offering a sleeker profile without compromising on load capacity.
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Product Series Overview: Engineering Density

Our single-row four-point contact ball bearings with internal teeth are engineered to handle complex load combinations in a single, compact unit. The "four-point contact" geometry allows a single row of balls to support axial loads from both directions, radial loads, and significant tilting moments simultaneously. By moving the gear teeth to the inner ring, we achieve:
  • Reduced Overall Diameter: The pinion gear meshes internally, allowing the outer structure to be smaller and more aerodynamic.
  • Enhanced Protection: The internal location of the gear teeth shields them from external debris, mud, and accidental impact, extending service life in harsh environments.
  • Superior Stiffness: The direct coupling of the drive motor to the inner ring (often the rotating member) minimizes deflection, ensuring precise positioning even under heavy off-center loads.

This series is available in a wide range of diameters, from small units for robotic joints to massive rings for wind turbine yaw systems, all customizable to your specific module and pressure angle requirements.


Key Features: Built for Performance and Durability

We don’t just cut gears; we engineer integrated systems. Our internal gear slewing supports stand out due to:
  1. Precision Internal Gear Machining: Using advanced CNC hobbing and shaping techniques, we achieve DIN Class 8 or better gear quality. This ensures smooth meshing with minimal backlash, reducing noise and vibration during operation. We can customize tooth profiles (involute, straight, or helical) to match your drive pinion perfectly.
  2. Optimized Heat Treatment: The raceways and gear teeth undergo a specialized induction hardening process. This creates a hard, wear-resistant surface layer while maintaining a tough, shock-absorbing core. This dual-property treatment is critical for preventing pitting on gear teeth and spalling on raceways under dynamic loading.
  3. Compact, High-Capacity Design: The single-row four-point contact arrangement offers the highest load-to-weight ratio in the industry. It replaces complex multi-bearing arrangements, simplifying your housing design and reducing total assembly weight.
  4. Robust Sealing Solutions: Recognizing that internal gears can trap contaminants if not sealed properly, we employ multi-lip labyrinth seals with grease purging channels. These seals effectively keep out dust, water, and abrasive particles while retaining lubrication in temperatures ranging from -40°C to +80°C.
  5. Flexible Mounting Options: Our inner rings feature optimized bolt hole patterns and pilot diameters to facilitate easy installation of motors and shafts. We can also integrate sensor mounts for real-time monitoring of rotation speed and position.


Applications: Where Space Meets Power

The internal gear single-row four-point contact ball slewing bearing is the preferred choice for applications where radial space is limited but torque requirements are high:
  • Compact Excavators & Mini-Cranes: The internal gear design allows for a tighter swing radius, enabling machines to operate in confined urban construction sites while maintaining powerful rotation.
  • Industrial Robotics & Turntables: Ideal for the base rotation of heavy-payload robots and welding positioners where the motor mounts centrally, and a low-profile footprint is essential for cell layout.
  • Aerial Work Platforms (AWP): Used in the turret rotation of boom lifts, providing stable, smooth movement for workers at height while resisting wind loads.
  • Solar Tracking Systems: Perfect for single-axis trackers where the drive mechanism needs to be protected from the elements and the overall structure must remain lightweight.
  • Material Handling Equipment: Found in stacker-reclaimers and port cranes, where reliable, high-torque rotation is needed to move bulk materials efficiently.
  • Defense & Turret Systems: Utilized in remote weapon stations and surveillance turrets where a low silhouette and protected drive train are tactical necessities.

Tag: Single-row Four-point Contact Ball Bearing

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