Precision Servo Planetary Gear Sets
Low-backlash (< 3 arcmin) ground epicyclic gear kits engineered for automation servo motors and robotics.
custom planetary gears
Planetary Gear Sets
High-torque, compact planetary gear sets including sun gears, planet pinions, planet carriers, and internal ring gears for precision reducers and mobile drivetrains.
Customization
100% to Drawing / Sample
Precision Grade
DIN 4-7 / AGMA 11-13
Engineering DFM
< 24 Hours Turnaround
Quality System
ISO 9001:2015
Featured Product Model & RFQ Specifications
Custom Planetary Gear Sets
High-torque density planetary gear assemblies engineered with micro-geometry tooth crowning and matched multi-pinion load sharing for precision reducers.
Kit components
Central sun gear, 3 to 5 planet pinions, planetary carrier, and internal ring gear
Manufacturing basis
Customer 2D/3D engineering prints, CAD step models, or transmission gearbox samples
Module & Pitch
Module M0.5 to M12 (DP 48 to DP 2) with 20° or 25° pressure angles
Accuracy grades
DIN 5 to DIN 7 / ISO Grade 5-7 CNC tooth flank profile ground
Manufacturing capability
Technical Overview & Engineering Capability for custom planetary gears.
Planetary gear systems (epicyclic gearing) distribute transmitted torque across multiple planet gears simultaneously, delivering high power density, compact coaxial packaging, exceptional torsional stiffness, and low backlash. ZhongYi manufactures custom planetary gear sets to customer drawings or reverse-engineered samples. The engineering and manufacturing scope covers central sun gears (often integrated with input shafts), precision planet pinions with precision-bored needle bearing seats, epicyclic planet carriers (cast, forged, or CNC milled from billet), and high-precision internally toothed ring gears. Technical optimization includes micro-geometry tooth modification (lead crowning and tip relief) to balance planetary load sharing, case carburizing and tooth flank profile grinding to ISO/AGMA precision grades, and matched multi-pinion weight and backlash sorting.
Tooth Accuracy DIN 4-7 / AGMA 11-13
Tooth Finishing CNC Ground (Ra ≤0.4µm)
Heat Treatment Carburized 58-62 HRC
Product types & variants
Planetary Gear Sets types and manufacturing paths.
The final product form is confirmed from the buyer drawing, mating component, assembly layout, operating conditions, and inspection requirements.
Heavy-Duty Construction Planetary Sets
Multi-stage rugged planet gears and forged carriers designed for excavators, wheel loaders, and winch reducers.
Sun Gears & Integral Input Sun Shafts
High-speed central drive pinions with precision bearing journals and motor shaft coupling interfaces.
Internal Ring Gears & Housing Rings
Internally broached or shaped ring gears with external bolt flanges or reducer housing integration.
Selection & Metallurgy guidance
How to specify the correct planetary gear sets configuration.
When specifying a planetary gear set, verify that the tooth counts satisfy the planetary assembly condition: (Z_ring + Z_sun) / N_planets = integer for symmetrical planet spacing. Confirm module, pressure angle, face width, sun shaft input interface, and planet pin diameter. Because manufacturing tolerances can cause uneven load sharing among planet gears, specify whether tooth crowning or matched planet sets are required. Provide input speeds, rated output torque, duty cycle, lubrication viscosity, and thermal limits.
Material & Heat Treatment Options
- Case carburizing alloy steels (20CrMnTi, 18CrNiMo7-6, 8620, 20CrMo) for high contact strength
- Through-hardened high-tensile alloy steels (42CrMo, 40Cr) for planet carriers and sun shafts
- Nitriding steels (38CrMoAlA) for low-distortion internal ring gears
- Special bronze and polymer blends for silent or specialized planetary drives
Engineering Selection Factors
- Stage reduction ratio, input speed, rated continuous torque, and peak shock torque
- Number of planet gears (typically 3, 4, or 5) and mathematical epicyclic mesh feasibility
- Tooth backlash targets (Standard < 10 arcmin, Precision < 3 arcmin)
- Needle roller bearing or journal bearing sizing and lubrication oil channels
- Heat treatment case depth, core toughness, and tooth profile crowning
Quality Control & Inspection Matrix
Engineering Evidence & 100% Inspection for Planetary Gear Sets.
Overseas procurement teams require verifiable technical data, not unsupported claims. Every production batch at ZhongYi is inspected against approved CAD blueprints and international standards (DIN, AGMA, ISO).
Component-Specific Quality Focus:
Planetary gear components undergo rigorous coordinate measuring machine (CMM) inspection and single-flank/double-flank gear rolling checks. Critical quality checkpoints include planet pin hole positional true position on the carrier, sun-to-planet center distance consistency, tooth profile and lead crowning deviation (Fα, Fβ), case depth gradient, and composite radial runout. Matched planet gear sets can be sorted by weight and tooth thickness for dynamic balance in high-speed applications.
Zeiss / Hexagon 3D CMM
Validates 3D spatial GD&T, bore concentricity, center distance, and geometric tolerances down to ±0.002 mm.
Klingelnberg CNC Gear Analyzer
Inspects involute tooth profile error (fα), lead crowning (fβ), pitch cumulative error (Fp), and radial runout (Fr).
Digital Micro-Vickers & Rockwell Testers
Verifies surface hardness (58–62 HRC), core toughness, and effective carburized / nitrided case depth gradient.
Direct-Reading Optical Spectrometer
100% chemical composition verification of alloy steel forgings (20CrMnTi, 42CrMo, 18CrNiMo7-6, Stainless, POM).
Inspection Deliverables with Every Shipment
Complete Batch Traceability & Certified Test Reports
- EN 10204 Type 3.1 Mill Test Certificate (Chemical & Mechanical Properties)
- Zeiss 3D CMM Full Dimensional Inspection Sheet
- Klingelnberg Tooth Profile & Lead Crowning Graph Report
- Effective Carburized Case Depth & Hardness Curve Data
- 100% Pre-Shipment Visual, Thread & Anti-Rust Quality Verification
Our Factory Quality Commitment:
We maintain strict incoming material spectroscopy, in-process CNC tooth coordinate monitoring, and 100% final pre-shipment dimensional inspection. All custom gear batches are backed by our full manufacturing warranty.
ISO 9001:2015 Certified
DIN 4-7 / AGMA 11-13 Standards
Application fit
Planetary Gear Sets operating environments.
Match the gear type with real machinery conditions, operating environment, load, speed, and replacement requirements.
- Precision servo planetary gearboxes for industrial robotics and CNC machine axes
- Heavy-duty wheel drives, track drives, and travel reducers for construction machinery
- Slew drive gearboxes, winch transmissions, and mobile crane rotary drives
- Wind turbine pitch/yaw drives and agricultural tractor final drives
Application Markets
View All 5 Industry Hubs →
Where Planetary Gear Sets Are Engineered & Deployed
Discover how this gear category meets extreme torque, low backlash, quiet operation, and weather-resistance demands in primary industry sectors:
🏗️ Heavy-Duty & High-Impact Transmission
Construction & Mining Machinery
High-torque, impact-resistant gears, girth rings, and planetary drive sets engineered for excavators, cranes, drilling rigs, and heavy mining crushers.
🌬️ 20-Year Outdoor Longevity & High Wind Torque
Renewable Energy
Heavy-torque yaw/pitch gears, slewing ring drives, and precision worm drives engineered for 20-year service life in wind turbines and solar tracking fields.
Technical FAQ
Common technical and purchasing questions for Planetary Gear Sets.
These answers support early engineering and procurement review. Final dimensions, materials, tolerances, and process requirements are confirmed against the approved drawing file.
What is the epicyclic assembly condition for symmetric planetary gears? ▼
For equally spaced planet gears, the sum of the tooth counts of the sun gear and the internal ring gear must be divisible by the number of planet gears ((Z_sun + Z_ring) / N = integer). If this condition is not met, non-symmetric carrier pin spacing is required.
How does ZhongYi ensure equal load sharing among multiple planet gears? ▼
We apply precision CNC tooth grinding with tight tooth thickness tolerances, matched planet sorting in grouped sets, and micro-geometry lead crowning to compensate for carrier torsional deflection under load.
Can ZhongYi manufacture replacement planet gears for an existing reducer? ▼
Yes. By reverse engineering worn sun/planet samples and measuring the carrier pin center-to-center pitch circle and internal ring gear, we produce matched replacement sets that restore smooth, quiet operation.
24-Hour Engineering Quote & DFM Review
Upload Your Drawings for Planetary Gear Sets Manufacturing
Send your 2D blueprints or 3D CAD models. Our senior gear engineering team will review tooth geometry, module/pitch, materials, heat treatment feasibility, and provide transparent factory pricing within 24 hours.
Supported CAD Blueprint & Drawing Formats:
STEP (.step / .stp) AutoCAD (.dwg / .dxf) IGES (.igs) SolidWorks / 3D CAD PDF Technical Blueprints Worn Physical Samples
Mutual NDA Protection
We sign strict Non-Disclosure Agreements to safeguard proprietary designs.
< 24h DFM Feedback
Rapid manufacturability review, tolerance checks, and unit quotation.
Direct Factory Engineering
Direct technical communication with senior master gear artisans.
Related product categories