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internal gear

noun, Machinery
1.
a gear having teeth cut on an inner cylindrical surface.
Also called annular gear, ring gear.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for internal gear
  • Pumps shall be lubrication pumps of internal gear pump design with mechanical seals.
  • Weight and bulk aren't too bad for a bike with an internal gear hub.
  • Rotation of the crankshaft established internal gear and valve train continuity.

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