Gear Teeth (if applicable): Module 4-40 mm

Component Specifications

Definition

Gear teeth integrated into the outer or inner ring of a slewing bearing (also called a turntable bearing) provide a mechanical interface for power transmission. These teeth mesh with a pinion gear to convert rotational motion into controlled torque, allowing large structures to rotate smoothly under heavy loads while maintaining precise positioning. The gear teeth are typically cut directly into the bearing's hardened steel ring, creating a unified component that combines load-bearing capacity with power transmission functionality.

Working Principle

Gear teeth on slewing bearings operate on the fundamental principle of gear meshing. When a pinion gear engages with the teeth on the bearing ring, rotational force is transferred through the contact surfaces. The involute tooth profile ensures smooth engagement and disengagement with minimal backlash, while the bearing's raceways support axial, radial, and moment loads simultaneously. This integrated design eliminates the need for separate gear assemblies, reducing complexity and improving mechanical efficiency in applications requiring both rotation and load support.

Materials

Typically manufactured from through-hardened or surface-hardened alloy steels such as 42CrMo4, 50Mn, or similar grades with hardness ranging from 55-62 HRC. Carburizing or induction hardening processes are applied to achieve wear-resistant tooth surfaces while maintaining tough core material for impact resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Module	4-40 mm
Backlash	0.1-0.3 mm (adjustable via pinion positioning)
Tooth Profile	Involute (standard), Cycloidal (special applications)
Accuracy Grade	DIN 3962 Class 6-9, AGMA 2000 Class 9-11
Hardness Depth	1.5-4.0 mm (case hardened)
Pressure Angle	20° (standard), 25° (high-load)
Surface Finish	Ra 0.8-3.2 μm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 281, ISO 6336, DIN 3961, DIN 3962, AGMA 2000, ANSI/AGMA 2001

Parent Products

This component is used in the following industrial products

Slewing Bearing (Ring)

The stationary or rotating ring component of a slewing bearing that provides the raceway for rolling elements.

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Engineering Analysis

Risks & Mitigation

Tooth breakage from shock loads
Premature wear due to misalignment
Pitting from insufficient lubrication
Backlash increase over time
Corrosion in harsh environments

FMEA Triads

Trigger: Inadequate lubrication or contaminated lubricant
Failure: Accelerated wear, pitting, or scoring on tooth surfaces
Mitigation: Implement automated lubrication systems with filtration, use high-viscosity EP greases, establish regular maintenance schedules

Trigger: Excessive backlash due to wear or improper installation
Failure: Reduced positioning accuracy, impact loading, vibration, and noise
Mitigation: Design with adjustable pinion mounting, specify appropriate accuracy grades, implement wear monitoring systems

Trigger: Tooth root cracks from fatigue or overload
Failure: Catastrophic tooth breakage leading to complete system failure
Mitigation: Proper material selection with adequate toughness, design with appropriate safety factors, implement load monitoring systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Tooth profile tolerance per DIN 3962 Class 7-8, pitch deviation ≤ 0.05 mm, cumulative pitch error ≤ 0.1 mm per meter of diameter

Test Method

Coordinate measuring machines (CMM) for tooth geometry, hardness testing per ISO 6508, magnetic particle inspection for surface defects, ultrasonic testing for internal flaws, backlash measurement with dial indicators

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Gear Teeth (if applicable)

Manufacturer profiles associated with Gear Teeth (if applicable).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the main advantages of integrated gear teeth on slewing bearings?

Integrated gear teeth eliminate alignment issues between separate components, reduce assembly time, minimize space requirements, improve structural integrity, and enhance load distribution compared to bolted-on gear rings.

How are gear teeth protected from corrosion in outdoor applications?

Common protection methods include zinc plating, phosphating, specialized coatings like Geomet or Delta Protekt, or application of corrosion-inhibiting greases. Stainless steel variants are available for highly corrosive environments.

Can damaged gear teeth be repaired on site?

Minor damage can sometimes be addressed through grinding or welding with post-weld heat treatment, but significant damage typically requires bearing replacement. Preventive maintenance through proper lubrication and alignment is recommended.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Gear Teeth (if applicable)