Structured Manufacturing Data (2026)

Planetary Gear Reducer

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Planetary Gear Reducer used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Planetary Gear Reducer is characterized by the integration of Sun Gear and Planet Gears. In industrial production environments, manufacturers listed on CNFX commonly emphasize Case-hardened alloy steel (e.g., 20CrMnTi) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A compact, high-torque gear reduction mechanism that transmits and reduces rotational speed within a slewing unit.

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Product Specifications

Technical details and manufacturing context for Planetary Gear Reducer

Definition
A planetary gear reducer is a critical component within a slewing unit, responsible for converting high-speed, low-torque input from a motor into low-speed, high-torque output to drive the slewing motion. It consists of a central sun gear, multiple planet gears that rotate around it, and an outer ring gear, all housed within a carrier. This configuration provides high power density, excellent torque transmission, and compact design essential for the precise and heavy-duty rotational movement of slewing applications in machinery like cranes, excavators, and wind turbines.
Working Principle
Power is input to the sun gear. This drives the surrounding planet gears, which mesh simultaneously with both the sun gear and the stationary (or rotating) internal ring gear. The planet gears orbit the sun gear while rotating on their own axes. The planet carrier, which holds the planet gears, becomes the output, providing reduced speed and multiplied torque. The specific gear ratio is determined by the number of teeth on the sun, planet, and ring gears.
Common Materials
Case-hardened alloy steel (e.g., 20CrMnTi), Bearing steel (e.g., GCr15)
Technical Parameters
  • Rated output torque capacity (Nm) Customizable
Components / BOM
  • Sun Gear Part
    The central input gear that drives the planet gears.
    Material: Case-hardened alloy steel
  • Planet Gears Part
    Multiple gears that mesh with the sun gear and the ring gear, rotating on their own axes while orbiting the sun gear.
    Material: Case-hardened alloy steel
  • Planet Carrier
    Holds the planet gears and provides the output shaft connection.
    Material: Alloy steel or ductile iron
  • Ring Gear (Internal Gear) Part
    The stationary or rotating outer gear that meshes with the planet gears.
    Material: Case-hardened alloy steel
  • Input Shaft/Housing Part
    Connects to the motor and houses the sun gear bearing.
    Material: Cast iron or steel
  • Output Flange/Shaft Part
    Connects the planet carrier to the driven load of the slewing unit.
    Material: Alloy steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Planetary Gear Reducer.

Planetary Gearbox Epicyclic Gear Reducer compact planetary gear reducer high torque planetary gearbox slewing unit gear reduction alloy steel planetary reducer machinery equipment gear mechanism

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Slewing Unit
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (mechanical component)
other spec: Max input speed: 3000 RPM, Max output torque: 5000 Nm, Efficiency: 94-98%
temperature: -20°C to 80°C (operating), -40°C to 100°C (storage)
Media Compatibility
✓ Industrial machinery lubrication oils ✓ Clean, dry air environments ✓ General industrial atmospheres
Unsuitable: High-concentration abrasive slurry environments
Sizing Data Required
  • Required output torque (Nm)
  • Input speed (RPM)
  • Required reduction ratio

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Tooth pitting and spalling
Cause: Surface fatigue from cyclic loading, inadequate lubrication, or material defects leading to Hertzian contact stress exceeding material endurance limits
Bearing cage failure
Cause: Excessive axial or radial loads, improper alignment, lubricant degradation causing increased friction and thermal stress on cage components
Maintenance Indicators
  • High-pitched whining or grinding noises during operation indicating gear mesh issues or bearing degradation
  • Visible metallic particles in lubricant oil analysis or excessive vibration readings (>2.5 mm/s RMS) during routine monitoring
Engineering Tips
  • Implement condition-based maintenance using vibration analysis and oil spectroscopy to detect early-stage wear patterns before catastrophic failure
  • Maintain strict alignment tolerances (<0.05 mm/m) during installation and use synthetic lubricants with extreme pressure additives specifically formulated for planetary gear applications

Compliance & Manufacturing Standards

Reference Standards
ISO 1328-1:2013 (Cylindrical gears) ANSI/AGMA 2000-A88 (Gear classification and inspection) DIN 3960 (Tolerances for cylindrical gear teeth)
Manufacturing Precision
  • Gear tooth profile: +/-0.01mm
  • Bearing seat concentricity: 0.02mm TIR
Quality Inspection
  • Gear tooth contact pattern test
  • Hardness testing (Rockwell C scale)

Factories Producing Planetary Gear Reducer

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the main advantages of using a planetary gear reducer in machinery manufacturing?

Planetary gear reducers offer high torque density in a compact design, excellent load distribution across multiple planet gears, high efficiency (typically 97-99% per stage), and precise positioning capabilities ideal for industrial machinery applications.

How does the material selection (20CrMnTi alloy steel and GCr15 bearing steel) impact performance?

Case-hardened 20CrMnTi alloy steel provides exceptional surface hardness (HRC 58-62) for wear resistance while maintaining a tough core for impact resistance. GCr15 bearing steel ensures smooth operation and longevity in high-load applications, reducing maintenance needs.

What maintenance is required for planetary gear reducers in industrial applications?

Regular lubrication with appropriate industrial gear oil, periodic inspection for wear on gear teeth and bearings, monitoring for unusual noise or vibration, and ensuring proper alignment during installation. Most units operate maintenance-free for extended periods with proper initial setup.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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