ZZ Slewing Bearing

Slewing bearing without teeth

slewing bearing without teeth, also known as toothless slewing bearings or smooth slewing bearings, are a bearing type that lacks gear teeth on the outer ring. It typically requires an external drive mechanism such as a pinion, hydraulic motor, or other drive system to transmit rotational motion, rather than relying on external gear teeth to induce rotation.

Here are some key points about gearless slewing bearings:

Design: These bearings have a smooth outer ring and no gear teeth, which makes their design simpler and more compact than slewing rings with external gears. They consist of an inner ring, an outer ring, rolling elements such as balls or rollers, and often contain seals and lubrication grooves.
Application: Slewing bearing without teeth are typically used in systems that have integrated external gear mechanisms or where design constraints require a toothless design. They are widely used in various industries such as construction, robotics, medical equipment and industrial automation.
Drive System: Due to the lack of gear teeth, gearless slewing rings rely on an external drive system for rotation. This can include gearboxes, hydraulic motors, electric motors or other mechanisms, depending on the specific requirements of the application.
Advantages: Slewing bearing without teeth offer several advantages, including simplicity of design, light weight, and potentially lower cost than their geared counterparts. They also provide more flexibility when selecting a drive system.
Considerations: When selecting a slewing bearing without teeth, factors such as load capacity, rotational speed, environmental conditions, and compatibility with the selected drive system need to be carefully considered to ensure optimal performance and longevity.
In general, slewing bearing without teeth play an important role in various machinery and equipment requiring rotational motion, providing diverse solutions to different engineering challenges.

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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