- a mechanism consisting of a worm engaging with and driving a worm wheel, the two axes usually being at right angles, used where a relatively low speed and a relatively large amplification of power are desired.
- Also called worm wheel. a gear wheel driven by a worm.
Origin of worm gear
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for worm gear
The frame e carries the worm-wheel a and the worm-gear b, which is operated by the crank f.
In this case the worm-gear pinion is on the side of the machine not seen in the engraving.
The worm-gear is forced tightly on the taper spindle with a nut, and keyed to prevent turning.
In removing it from the box, pick it up by placing the hands underneath the worm-gear.The Gunner's Examiner
Harold E. Cloke
- a device consisting of a threaded shaft (worm) that mates with a gearwheel (worm wheel) so that rotary motion can be transferred between two shafts at right angles to each other
- Also called: worm wheel a gearwheel driven by a threaded shaft or worm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012