ZZ Slewing Bearing

Double-Start Worm Slewing Drive, Efficient and Flexible Transmission

The self-locking property of traditional single-start worms provides holding torque but also carries high risks of low efficiency and severe heat generation. Once the self-locking torque is insufficient or fails, the massive reverse drive from the load can instantly destroy the worm and gear, leading to catastrophic consequences such as **gear tooth breakage and equipment damage.

Slewing Drive Selection

Our upgrade is not a simple addition but a fundamental redesign of the safety logic:

1. Double-Start Worm • Efficient and Flexible Transmission

• Mechanism: The double-start thread provides twice the lead of a single-start worm. For each revolution of the worm, the worm gear (ring gear) advances by two tooth pitches.
• Advantage: Significantly improved transmission efficiency, smoother power delivery, and lower energy consumption.

2. Dual Safeguard • Eliminating “Jamming and Tooth Breakage”

• Mechanism: The double-start design intentionally reduces the self-locking tendency of traditional worm gears. This is not a compromise on safety but rather a strategy to create a more advanced “electro-mechanical dual safety” mechanism, in combination with a high-performance brake motor.

 

Worm Gear Slewing Drive

Advantage:

• More reliable mechanical transmission: Avoids internal stress concentration caused by stubborn self-locking, protecting the gears from abnormal impact and fracture.
• Safety no longer relies solely on “self-locking”: Equipment positioning and safety retention are primarily handled by a more precise and reliable electronic braking system. Even under extreme impact, the brake system responds instantly, firmly locking the system and fundamentally preventing gear damage.

Conclusion:

We replace the outdated and unreliable approach of “relying solely on mechanical self-locking” with a solution that combines “high-efficiency double-start worm transmission”and”instant brake locking.”This not only achieves flexible transmission and high efficiency but also provides dual safety protection, offering an ultimate solution for the long-term stable operation of your equipment.

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

ZZ Slewing Bearing supplies a full range of slewing bearings to meet different industrial needs:

  • Single row four point contact slewing bearings Application: medium loads, precise rotation.
  • Double row ball bearings  Application: higher radial and axial loads.
  • Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
  • Three row roller bearings – Application: extreme loads in heavy equipment.
  • Ball combine roller bearings –Application:  precise rotational adjustment applications.
  • Customized bearings – tailored for specific equipment requirements.

Typical selection parameter for ZZ clients:

Load type: axial, radial, and tilting moment.

Rotation RPM: ensures long service life.

Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.

Precision & rigidity requirements: critical for cranes, excavators, and robots.

ZZ engineers provide professional selection guidance according to your equipment and drawings.

ZZ Slewing Bearing selects materials for strength, wear resistance, and long-term durability:

Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.

Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).

Corrosion resistant: SS 304, 316L, duplex stainless steel.

Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

Typical factors observed by ZZ engineers:

  • Insufficient or incorrect lubrication.
  • (dust, metal particles) in raceways.
  • Rolling element or track damage.
  • Uneven mounting surfaces or misalignment.
  • Incorrect bolt torque(below grade 8.8) or preloading.

In-stock: 3–7 days.

Custom: 2–6 weeks depending on size, load, and precision.

Warranty: 1 year

Lifetime Free Spare Parts: Glue, seals, steel ball

Yes — ZZ Slewing Bearing offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

Full range of materials and heat treatments for various load conditions.

High precision and strict quality inspection standards.

Engineering support before and after delivery.

Customization to exact equipment requirements.

Proven performance in cranes, excavators, robotics, wind turbines, and heavy machinery etc.

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