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Internal Gear Spec Table
Internal Gear Specifications — 6 sizes
KS B 1401JIS B 1702
An internal gear with teeth on the inner surface, serving as the ring gear in planetary gear systems for compact reducer designs.
Practical Notes
- Tooth count difference between external and internal gear determines reduction ratio. Configure as planetary reducer for compact high reduction.
- When used in internal gear pumps, tip-to-root clearance directly affects volumetric efficiency.
Selection Guide
External gear meshes inside an internal ring gear. Used in planetary reducers and internal gear pumps. Provides high reduction ratios in compact space.
KSJISInternal Gear
3 sizesThe dimensions below are identical across KS B 1401 · JIS B 1702.
| Nominal | m | α | ha | Formula | Use |
|---|---|---|---|---|---|
| M1 Internal | 1 | 20° | 1 | D=m(Z-2) | Gear, |
| M2 Internal | 2 | 20° | 2 | D=m(Z-2) | Planetary Reducer |
| M3 Internal | 3 | 20° | 3 | D=m(Z-2) | LargePlanetary |
Key Features
- Small gear (external teeth) meshes inside large gear (internal teeth) in concentric structure
- More compact than external gearing; center distance greatly reduced for same ratio
- Functions as ring gear in planetary gear sets; key to achieving high torque and reduction
Key Applications
Planetary reducers, automatic transmission planetary gear trains, hydraulic gear pumps, robot joint reducers, wind turbine yaw drives
FAQ
How do internal gear pumps work?
Fluid is drawn in and expelled by the changing volume between rotating external gear and internal ring gear. Low noise and pulsation make them common in hydraulic systems.