Industry-Verified Manufacturing Data (2026)

Planetary Gear Set

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Planetary Gear Set 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 Set is characterized by the integration of Sun Gear and Planet Gears. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A compact, high-torque gear arrangement consisting of central sun gear, multiple planet gears, and outer ring gear.

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Product Specifications

Technical details and manufacturing context for Planetary Gear Set

Definition
A planetary gear set is a critical component within drive systems (servo motor & gearbox) that provides high torque transmission, compact size, and multiple speed ratios through its unique arrangement of gears. It enables precise motion control and power transmission in various industrial applications.
Working Principle
Power enters through the sun gear, which drives the planet gears orbiting around it. The planet gears mesh with both the sun gear and the stationary or rotating ring gear, creating multiple contact points for torque distribution. Different speed ratios are achieved by fixing different components (sun, carrier, or ring) while allowing others to rotate.
Common Materials
Alloy Steel, Case-Hardened Steel, Bronze (for bushings)
Technical Parameters
  • Module (gear size), number of teeth, gear ratio, torque capacity, backlash tolerance (mm) Customizable
Components / BOM
  • Sun Gear
    Central driving gear that transmits power to planet gears
    Material: Case-hardened alloy steel
  • Planet Gears
    Multiple gears that orbit around sun gear and mesh with ring gear
    Material: Case-hardened alloy steel
  • Planet Carrier
    Holds planet gears in position and transmits output torque
    Material: Alloy steel or aluminum
  • Ring Gear
    Outer stationary or rotating gear that meshes with planet gears
    Material: Case-hardened alloy steel
Engineering Reasoning
0-6000 rpm input speed, 0-500 N·m input torque, -40°C to 120°C operating temperature
Planet gear tooth bending stress exceeds 1200 MPa (SAE 8620 steel yield strength), ring gear hoop stress exceeds 900 MPa, or sun gear contact stress exceeds 1800 MPa (Hertzian contact limit)
Design Rationale: Micropitting fatigue due to elastohydrodynamic lubrication film collapse at lambda ratio <1.0, causing asperity contact and subsurface shear stress exceeding material endurance limit (Goodman diagram)
Risk Mitigation (FMEA)
Trigger Misalignment exceeding 0.05 mm/mm from manufacturing tolerance stack-up or housing deflection under 500 N·m load
Mode: Uneven load distribution causing single planet gear tooth bending fatigue fracture at 10⁷ cycles (Wöhler curve)
Strategy: Integral carrier design with 0.02 mm positional tolerance and ISO 1328-1:2013 gear quality 6 specification
Trigger Insufficient EP additive concentration (<1.5% sulfur-phosphorus) in lubricant at 90°C operating temperature
Mode: Scoring wear on ring gear internal teeth with material removal rate >0.01 mm/1000 hours (Archard's wear law)
Strategy: Forced lubrication system with 10 μm filtration and inline viscosity monitoring maintaining ISO VG 320 at 40°C

Industry Taxonomies & Aliases

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

high torque planetary gear set compact planetary gear arrangement alloy steel planetary gears industrial planetary gearbox components case-hardened steel ring gear

Applied To / Applications

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

Drive System (Servo Motor & Gearbox)
View system integration details
Gear Train (Spur/Helical/Planetary)
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100 bar
other spec: Max torque: 5000 Nm, Max speed: 6000 rpm
temperature: -40°C to 120°C
Media Compatibility
✓ Industrial lubricants ✓ Hydraulic fluids ✓ Clean air/gas
Unsuitable: Abrasive slurry environments
Sizing Data Required
  • Required torque output (Nm)
  • Input speed (rpm)
  • Required gear ratio

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Tooth pitting and spalling
Cause: Surface fatigue due to cyclic contact stresses exceeding material endurance limit, often accelerated by inadequate lubrication, misalignment, or overloading
Planetary carrier bearing failure
Cause: Excessive radial loads causing brinelling, or inadequate lubrication leading to overheating and premature wear, frequently from improper assembly or contamination
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 on condition monitoring equipment
Engineering Tips
  • Implement strict contamination control protocols for lubricants and maintain proper filtration to ISO 4406 cleanliness codes specific to gearbox requirements
  • Use laser alignment tools during installation and perform regular thermal imaging inspections to detect early-stage misalignment or overheating issues

Compliance & Manufacturing Standards

Reference Standards
ISO 1328-1:2013 Cylindrical gears - ISO system of flank tolerance classification DIN 3961:1978 Tolerances for cylindrical gear teeth ASTM A29/A29M-20 Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for
Manufacturing Precision
  • Bore diameter: +/-0.01 mm
  • Tooth profile deviation: 0.02 mm
Quality Inspection
  • Gear tooth profile measurement using coordinate measuring machine (CMM)
  • Hardness testing (Rockwell C scale) for gear teeth surfaces

Factories Producing Planetary Gear Set

Verified manufacturers with capability to produce this product in China

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✓ 98% Supplier Capability Match Found

S Sourcing Manager from Singapore Feb 05, 2026
★★★★★
"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Planetary Gear Set meets all ISO standards."
Technical Specifications Verified
P Procurement Specialist from Germany Feb 02, 2026
★★★★☆
"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Planetary Gear Set arrived with full certification. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Brazil Jan 30, 2026
★★★★★
"Great transparency on the Planetary Gear Set components. Essential for our Machinery and Equipment Manufacturing supply chain."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

18 sourcing managers are analyzing this specification now. Last inquiry for Planetary Gear Set from India (1h ago).

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Frequently Asked Questions

What are the main advantages of a planetary gear set in machinery?

Planetary gear sets offer high torque density, compact size, and excellent load distribution due to multiple planet gears sharing the load, making them ideal for space-constrained industrial applications.

What materials are used in your planetary gear sets?

Our planetary gear sets use alloy steel and case-hardened steel for gears to ensure strength and wear resistance, with bronze bushings for smooth operation and reduced friction.

What components are included in a planetary gear set BOM?

A complete planetary gear set includes a sun gear, multiple planet gears, a planet carrier to hold the planet gears, and an outer ring gear, all precision-engineered for optimal performance.

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 Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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