Standard internal gears
Internally toothed rings for an external mating pinion, manufactured to the approved geometry and mounting drawing.
custom internal gears
Internal Ring Gears
Custom internal gears and ring gears for compact transmission, reduction, and planetary-type assemblies.
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 Internal Ring Gear
Precision internally-toothed ring gears and planetary annuli manufactured to print for compact reducers, slew drives, and epicyclic gear systems.
Product type
Internally toothed ring gear, planetary annulus, or slewing internal gear ring
Manufacturing basis
Buyer 2D/3D drawing, sample, mating planet pinion data, or technical specification
Tooth geometry
Module (M1 - M16), pressure angle (20ยฐ / 25ยฐ), internal straight or helical teeth
Ring dimensions
Outside diameter from 80 mm up to 800 mm, custom rim wall thickness and face width
Manufacturing capability
Technical Overview & Engineering Capability for custom internal gears.
Custom internal gears place the teeth on the inside diameter of a ring and mesh with an external pinion. They are used where the assembly needs compact coaxial packaging, a high contact ratio, or an internal reduction arrangement. ZhongYi reviews internal ring gear enquiries against buyer drawings, samples, and mating-pinion data. Important inputs include module, pressure angle, internal tooth count, outside diameter, ring width, mounting features, material, heat treatment, runout datums, and the manufacturing clearance available for the internal teeth.
Tooth Accuracy DIN 4-7 / AGMA 11-13
Tooth Finishing CNC Ground (Ra โค0.4ยตm)
Heat Treatment Carburized 58-62 HRC
Product types & variants
Internal Ring Gears types and manufacturing paths.
The final product form is confirmed from the buyer drawing, mating component, assembly layout, operating conditions, and inspection requirements.
Large ring gears
Larger-diameter components where blank stability, wall thickness, runout, handling, and inspection access require early review.
Planetary ring gears
Internal gears used with planet gears and a sun gear, requiring compatible tooth counts, center distances, and assembly data.
Segment or special ring forms
Drawing-led ring sections or mounting configurations reviewed for machining access and deformation risk.
Selection & Metallurgy guidance
How to specify the correct internal ring gears configuration.
The mating pinion and complete center-distance calculation should be supplied with an internal gear request. An internal gear may be limited by interference between the pinion and ring, by the available cutter, and by the relationship between tooth depth and ring wall thickness. The drawing should state whether the ring is a separate component, part of a housing, or a member of a planetary set. Confirm mounting holes, pilot diameters, datum faces, runout, backlash, material, heat treatment, and whether distortion must be corrected after treatment.
Material & Heat Treatment Options
- Carbon steel for general ring gear components
- Alloy steel for specified heat-treated applications
- Cast or forged blanks when documented by the buyer
- Alternative materials considered only against confirmed drawings
Engineering Selection Factors
- Module, pressure angle, tooth count, and mating pinion
- Outside diameter, ring width, wall section, and mounting pattern
- Required ratio, center distance, backlash, and runout
- Material, heat treatment, distortion allowance, and finishing route
- Tool access, internal diameter, inspection method, and quantity
Quality Control & Inspection Matrix
Engineering Evidence & 100% Inspection for Internal Ring Gears.
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:
Internal teeth are less accessible than external teeth, so manufacturability and inspection planning should be agreed before production. ZhongYi can review the blank, datum strategy, internal tooth geometry, mating pinion, heat-treatment sequence, and drawing tolerances as part of the quotation process. Depending on the approved technical file, checks may cover mounting diameter, face and tooth runout, tooth thickness, pitch-related characteristics, hardness, and fit with a reference pinion. No precision grade or planetary performance is claimed unless it is included in the buyer-approved requirements.
Zeiss / Hexagon 3D CMM
Validates 3D spatial GD&T, bore concentricity, center distance, and geometric tolerances down to ยฑ0.002 mm.
Klingelnberg CNC Gear Analyzer
Inspects involute tooth profile error (fฮฑ), lead crowning (fฮฒ), pitch cumulative error (Fp), and radial runout (Fr).
Digital Micro-Vickers & Rockwell Testers
Verifies surface hardness (58โ62 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
Internal Ring Gears operating environments.
Match the gear type with real machinery conditions, operating environment, load, speed, and replacement requirements.
- Planetary and epicyclic transmission assemblies
- Compact reduction mechanisms and machinery drives
- Rotary tables, actuators, and positioning systems
- Replacement ring gears for industrial equipment
Application Markets
View All 5 Industry Hubs โ
Where Internal Ring Gears Are Engineered & Deployed
Discover how this gear category meets extreme torque, low backlash, quiet operation, and weather-resistance demands in primary industry sectors:
๐๏ธ 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.
๐ค Sub-Arcminute Motion & Dynamic Positioning
Automation & Robotics
Low-backlash, ultra-precise fine-pitch gears, ground helical racks, and planetary gearheads for robotics, AGV wheel drives, and high-speed motion axes.
๐ฌ๏ธ 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 Internal Ring Gears.
These answers support early engineering and procurement review. Final dimensions, materials, tolerances, and process requirements are confirmed against the approved drawing file.
What mating information is needed for a custom internal gear? โผ
Provide the external pinion or planetary-set data, module, pressure angle, tooth counts, center distance, backlash requirement, face width, material, heat treatment, and the ring mounting drawing.
Why is ring wall thickness important? โผ
A thin ring can deform during machining, heat treatment, clamping, or inspection. The wall section and mounting design therefore affect process planning, achievable tolerances, and whether post-treatment finishing is required.
Can an internal ring gear be made from a sample? โผ
A sample can be evaluated, but internal wear and assembly distortion may affect measurement. A mating pinion, housing dimensions, operating ratio, and any available historic drawing make reverse review more reliable.
24-Hour Engineering Quote & DFM Review
Upload Your Drawings for Internal Ring Gears 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.
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