INDUSTRY COMPONENT

Gear Teeth

Gear teeth are the projecting elements on gear wheels that transmit torque and motion through meshing engagement in mechanical systems.

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Component Specifications

Definition
Gear teeth are precisely engineered projections arranged around the circumference of gear wheels, designed to mesh with corresponding teeth on mating gears to transmit rotational motion and torque. In helical and bevel gears, teeth are cut at an angle to the gear axis (helical) or on conical surfaces (bevel), enabling smooth power transmission, reduced noise, and higher load capacity compared to spur gears. Their geometry follows specific involute or cycloidal profiles to ensure constant velocity ratio and proper contact patterns.
Working Principle
Gear teeth operate on the principle of mechanical engagement, where the meshing of tooth profiles converts input rotational motion into output motion with controlled speed, torque, and direction. In helical gears, angled teeth engage gradually, reducing shock and noise while distributing load across multiple teeth. In bevel gears, teeth on conical surfaces transmit motion between intersecting shafts, typically at 90-degree angles. The involute tooth profile ensures smooth rolling contact and compensates for minor misalignments.
Materials
Common materials include alloy steels (e.g., AISI 4140, 8620), carbon steels, stainless steels (e.g., 304, 316 for corrosion resistance), cast iron, bronze, and engineered plastics (e.g., nylon, acetal for lightweight applications). Heat treatments like carburizing, nitriding, or induction hardening are applied to enhance surface hardness (typically 55-65 HRC) and wear resistance while maintaining a tough core.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Module1-10 mm
Hardness55-65 HRC (surface)
Face Width10-100 mm
Helix Angle15°-30°
Accuracy GradeISO 1328 Class 5-9
Pressure Angle20° (common), 14.5° (legacy)
Surface FinishRa 0.4-1.6 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 1328, ISO 6336, DIN 3960, AGMA 2001

Parent Products

This component is used in the following industrial products

Helical/Bevel Gears

Gear components in a main drive gearbox that transmit power and motion between non-parallel shafts.

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Swing Bearing

A large-diameter bearing that enables the upper structure of a crawler excavator to rotate relative to the undercarriage.

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Main Reduction Gear

The primary gear component within an elevation gear assembly responsible for achieving the main speed reduction and torque multiplication.

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Engineering Analysis

Risks & Mitigation
  • Tooth breakage due to overload or fatigue
  • Wear and pitting from inadequate lubrication
  • Noise and vibration from misalignment or improper meshing
  • Scoring from poor surface finish or contamination
FMEA Triads
Trigger: Excessive torque or shock loads
Failure: Tooth bending fatigue or fracture
Mitigation: Design with adequate safety factors, use high-toughness materials, implement overload protection devices
Trigger: Insufficient or contaminated lubrication
Failure: Abrasive wear, pitting, or scoring
Mitigation: Follow manufacturer lubrication schedules, use filters, select appropriate lubricant viscosity
Trigger: Misalignment during installation or operation
Failure: Uneven load distribution leading to premature wear
Mitigation: Precision alignment during assembly, use flexible couplings, regular maintenance checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Tooth profile tolerance per ISO 1328 Class 5-9, backlash control within 0.05-0.2 mm depending on application
Test Method
Coordinate measuring machines (CMM) for geometry, hardness testers (Rockwell), surface roughness testers, noise and vibration analysis, load testing under simulated conditions

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Gear Teeth

Manufacturer profiles associated with Gear Teeth.

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Frequently Asked Questions

What is the difference between helical and bevel gear teeth?

Helical gear teeth are cut at an angle to the gear axis, providing smooth, quiet operation and higher load capacity for parallel shafts. Bevel gear teeth are mounted on conical surfaces and transmit motion between intersecting shafts, commonly at 90 degrees, used in applications like differential drives.

Why are gear teeth typically made with an involute profile?

The involute profile ensures constant velocity ratio during meshing, reduces friction and wear, allows for variable center distances without affecting motion transmission, and is easier to manufacture precisely compared to other profiles like cycloidal.

How does material selection affect gear tooth performance?

Material choice impacts durability, load capacity, and application suitability. Alloy steels offer high strength and wear resistance for heavy loads, stainless steels provide corrosion resistance, bronze reduces friction in worm gears, and plastics are used for lightweight, low-noise applications.

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.

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