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Parameters

40
3
10

Internal Gear Preview

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What is an Internal Gear?

An internal gear (ring gear) has teeth on the inside of a cylindrical surface. It meshes with an external spur gear (pinion) rotating inside it. Internal gears are fundamental components in planetary gear systems, which are widely used in automatic transmissions, wind turbines, and industrial machinery.

Advantages

  • Compact design — the pinion sits inside the ring gear
  • High torque density in planetary configurations
  • Both gears rotate in the same direction
  • Reduced sliding and better efficiency

Internal Gear vs. Other Gear Types

See how internal (ring) gears compare to other common gear types across key engineering criteria.

Feature Internal Gear Spur Gear Helical Gear
Noise Level Low — internal meshing reduces vibration Moderate — external tooth impact Low — gradual engagement
Load Capacity High — concave-convex contact increases strength Moderate — convex-convex contact High — multiple teeth in mesh
Efficiency 96–99% — reduced sliding at tooth contact 95–99% — no axial losses 94–98% — slight axial friction
Cost Medium — internal broaching or shaping required Low — simple external hobbing Medium — angled tooth cutting
Complexity Medium — compact but harder to inspect and assemble Low — simple parallel shaft mounting Medium — thrust bearings required
Typical Applications Planetary gearboxes, auto transmissions, wind turbines Clocks, conveyors, pumps, machine tools Industrial gearboxes, automotive drivetrains