Helical-gear four-point contact ball slewing bearing for slewing mechanisms

1. Introduction to Helical-Gear Four-Point Contact Ball Slewing Bearings

1.1 What is a helical-gear four-point contact ball slewing bearing?

The four-point contact ball slewing bearing is a type of single-row ball slewing bearing. Its internal rolling elements and raceways form a four-point contact structure, enabling it to simultaneously withstand axial loads, radial loads, and tilting moments.

Standard four-point contact ball slewing bearings come in three drive configurations: non-geared, spur-geared, and helical-geared. The helical-gear variant features an optimized gear ring with a helical tooth structure; the continuous meshing of the helical teeth with the drive pinion drives the entire bearing assembly in a continuous rotational motion, providing stable power output for the machine's slewing mechanism.

1.2 Key Technical Features of Helical-Gear Four-Point Contact Ball Slewing Bearings

High load-bearing capacity for combined loads

The four-point contact ball structure supports axial forces in both directions while simultaneously bearing radial forces and tilting moments, making it ideal for slewing mechanisms subject to intermittent start-stop cycles and impact loads.

Helical gear transmission for high stability

Helical gears offer a higher contact ratio and reduced meshing impact, making them suitable for automation equipment and offshore lifting machinery that require long-term, continuous operation.

Compact structure and lightweight design

The single-row ball layout results in a low cross-sectional profile and reduced weight, effectively minimizing the overall height of the equipment's turntable; this makes it ideal for mobile construction machinery and aerial work platforms.

Extensive customization options

Parameters such as gear module, helix angle, tooth surface hardening process, mounting hole layout, anti-corrosion coating, and internal clearance grade can all be customized to suit the slewing mechanism requirements of OEMs worldwide, whether for retrofitting existing equipment or equipping new machinery.

1.3 Key Differences: Helical Gear vs Spur Gear Four-Point Contact Ball Slewing Bearing

II. Applications of Helical-Geared Four-Point Contact Ball Slewing Bearings

2.1 Slewing Mechanisms for Construction Machinery

Four-point contact ball slewing bearings are most commonly used in the superstructure slewing systems of light- to medium-duty truck cranes, truck-mounted cranes, compact excavators, aerial work platforms, and rotary drilling rigs.

2.2 Slewing Mechanisms for Port and Marine Lifting Equipment

Slewing mechanisms for portal cranes, small offshore platform cranes, and marine equipment operate under conditions of high humidity and severe corrosion. LTZC supplies helical-geared four-point contact ball slewing bearings featuring specialized gear rings, induction hardening, and anti-corrosion treatments.

2.3 Slewing Mechanisms for Automation Equipment and Precision Turntables

Applications include industrial welding turntables, material stacking robots, rotating radar bases, and slewing mechanisms for automated spraying equipment. For high-precision slewing requirements, LTZC offers P5/P4 precision-grade helical-geared four-point contact ball slewing bearings; these control axial and radial runout to ensure the equipment's repeatability and positioning accuracy.

III. Advantages of LTZC Helical-Geared Four-Point Contact Ball Slewing Bearings

3.1 Comprehensive, self-managed production chain

 We oversee every stage—from raw forgings and incoming inspections to final factory testing—providing full inspection reports and supporting third-party inspections (e.g., BV, CCS) to ensure precision and quality control from the source.

3.2 Advanced manufacturing capabilities

 Our factory is equipped with 10-meter CNC gear hobbing machines and 8-meter gear shaping machines, enabling precise control over gear module and tolerances, as well as support for custom gear profiles.

3.3 Customized solutions for non-standard slewing mechanisms

LTZC boasts a team of expert mechanical design engineers capable of working with customer-provided 3D models, 2D drawings, or physical samples for reverse engineering, allowing for the rapid structural optimization of helical-geared four-point contact ball slewing bearings.

3.4 Comprehensive pre-delivery inspection reports for all helical-geared four-point contact ball slewing bearings

① Dimensional tolerance inspection; ② Raceway and gear hardness testing; ③ Non-destructive testing (NDT); ④ No-load starting torque test; ⑤ Axial and radial runout inspection; ⑥ Sealing performance check; ⑦ Full visual inspection.

Leveraging over thirty years of deep expertise in slewing bearings, comprehensive in-house manufacturing capabilities, and rigorous quality control systems, LTZC consistently supplies highly reliable slewing bearings to global customers, providing stable and dependable transmission and support solutions for the slewing mechanisms of construction machinery, port and marine equipment, and new energy machinery worldwide.

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