INDUSTRY COMPONENT

Planet Gears

Planet gears are rotating gears in planetary gear systems that mesh with both sun and ring gears to provide torque multiplication and speed reduction.

Component Specifications

Definition
Planet gears are the intermediate gears in a planetary gear arrangement, typically mounted on a carrier that rotates around a central sun gear while simultaneously meshing with an outer ring gear. This configuration allows for compact, high-torque transmission with multiple power paths, making them essential in reduction gear systems for achieving precise speed control and load distribution.
Working Principle
Planet gears operate on the epicyclic principle, where multiple planet gears rotate around a central sun gear while engaging with a stationary or rotating ring gear. This creates compound motion that multiplies torque and reduces speed through gear ratio relationships, with the carrier's rotation determining output characteristics.
Materials
Typically alloy steels (AISI 8620, 4140, 9310) case-hardened to 58-62 HRC for durability, with surface treatments like carburizing or nitriding. Alternative materials include powdered metals for cost efficiency or specialized alloys for extreme environments.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Efficiency95-98%
Module Range1-10 mm
Load CapacityUp to 5000 Nm
Tooth ProfileInvolute
Accuracy GradeISO 1328 Class 5-8
Pressure Angle20° standard

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, DIN 3960, AGMA 2000

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Tooth fatigue failure
  • Misalignment causing uneven wear
  • Insufficient lubrication leading to scoring
  • Carrier bearing failure
  • Thermal expansion issues
FMEA Triads
Trigger: Inadequate lubrication
Failure: Surface pitting and scoring
Mitigation: Implement automatic lubrication systems with monitoring sensors
Trigger: Misaligned carrier assembly
Failure: Uneven tooth loading and premature wear
Mitigation: Use precision alignment tools during installation and regular laser alignment checks
Trigger: Material defects or improper heat treatment
Failure: Tooth breakage under load
Mitigation: Implement material certification and destructive testing protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Tooth profile tolerance ±0.02mm, pitch error <0.03mm, runout <0.05mm
Test Method
Coordinate measuring machine (CMM) inspection, gear rolling test per AGMA 2000, hardness testing per ISO 6508

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 Planet Gears

Manufacturer profiles associated with Planet Gears.

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Frequently Asked Questions

What is the main function of planet gears?

Planet gears distribute load across multiple teeth simultaneously, providing high torque capacity, compact design, and smooth power transmission in reduction gear systems.

How do planet gears differ from standard gears?

Unlike fixed-axis gears, planet gears rotate around a central axis while meshing with two other gears (sun and ring), enabling compound motion and superior torque density.

What maintenance do planet gears require?

Regular lubrication with EP gear oils, periodic inspection for tooth wear or pitting, and alignment checks of the carrier assembly to prevent uneven loading.

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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