Cycloidal drive

A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio. It is somewhat similar in appearance internally to an internal gear pump with the outer gear driving the output shaft. The input shaft drives an eccentric bearing that in turn drives the cycloidal disc in an eccentric, cycloidal motion. The perimeter of this disc is geared to a stationary ring gear and has a series of output shaft pins or rollers placed through the face of the disc. These output shaft pins directly drive the output shaft as the cycloidal disc rotates. The radial motion of the disc is not translated to the output shaft.

See also

• Epicyclic gearing
• Cycloid gear A gear tooth shape based on the cycloid

External links

Wikimedia Commons has media related to: Cycloidal drive

• Kinematic Models for Design Digital Library (KMODDL)
  Movies and photos of hundreds of working mechanical-systems models at Cornell University. Also includes an e-book library of classic texts on mechanical design and engineering.
• Sumitomo Cycloid Reducer
• Darali Cycloid Reducers

v • d • e Gears Gear systems Spur gear systems • Worm drive • Rack and pinion • Epicyclic (planetary) gearing • Sun and planet gear • Harmonic drive • Cycloidal drive • Non-circular gear Gear shapes Spur gear • Bevel gear • Spiral bevel gear • Helical gear Geartooth profiles Involute • Cycloid Gear mechanics Transmission • Differential • Gear coupling • Gear train • Bicycle gearing • Continuously variable transmission • Offset (gears) Examples In Bicycles: Cogset • Derailleur gears • Hub gear • Shaft-driven bicycle • Sprocket In Horology: Wheel train See also Ball screw • Leadscrew • Jackscrew • Belt drive • Chain drive • Gear manufacturing • Freewheel

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