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.
Product overview
Technical overview of 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.
Product types
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 guidance
How to specify the correct 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 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
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
Applications
Internal Ring Gears application fit.
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
Quality and technical verification
Inspection requirements tied to approved technical data.
Useful engineering evidence is more valuable than unsupported quality claims. Critical checks, records, and acceptance criteria are defined from the drawing and purchase requirement.
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.
All products can be custom manufactured from drawings or samples.
Buyer FAQ
Common technical and purchasing questions.
These answers support early technical review. Final dimensions, materials, tolerances, and process requirements are confirmed against the approved file for each enquiry.
What mating information is needed for a custom internal gear?
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?
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?
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.
Custom manufacturing
Send drawings or samples for technical review.
ZhongYi can review geometry, material, heat treatment, bore, keyway, tooth profile, application conditions, and order quantity before quoting.
Related product categories
Request a quote
Send drawings, samples, or technical requirements for review.
Our team can review your gear type, material, heat treatment, tolerance, order quantity, and application conditions before quotation.