wormwheel 
noun
The wheel of a worm gear.For example, the wormwheel may be formed from sintered iron whilst the worm is made of carbon steel....
- The 120-tooth wormwheel drives the first gear of the bevel gear cluster via the shaft to which both are affixed.
- The Wire drive unit is of proven design utilising intermeshed steel wormshaft and bronze wormwheels.