What does wormwheel mean?
A wormwheel is the toothed wheel in a worm gearing system, a mechanical arrangement that uses a screw-like shaft called a worm to transmit rotation to a perpendicular shaft. The teeth of the wormwheel engage with the spiral thread of the worm, allowing compact gearboxes and speed reducers to be built. Such systems commonly reduce rotational speed and can also provide a locking effect when the drive is stopped, although these properties depend on the design and application. In general conversation, “worm” and “wheel” might suggest an earthworm or a simple circular object, but in mechanical contexts the compound has a precise engineering meaning. The term is most often encountered in discussions of gearboxes, machine tools, motors, actuators, and other machinery. It is also sometimes written as “worm wheel,” reflecting its status as a compound of two familiar mechanical elements rather than a specialized term derived from a single root.
nounA toothed gear wheel that meshes with a worm, a screw-like shaft, transmitting motion between perpendicular shafts and often reducing rotational speed.
- The toothed wheel in a worm gearing system, designed to mesh with a screw-like worm.
"The wormwheel meshes with the worm to transfer rotation to the output shaft."
"A worn wormwheel can make the gearbox noisier and less efficient."
"The designer selected a larger wormwheel to increase the reduction ratio."
The regular plural of the closed spelling is “wormwheels”; the open style “worm wheel” pluralizes as “worm wheels.”
"The technician replaced both wormwheels before recalibrating the gearbox."
A tiny spiral of steel can turn an entire gearbox, thanks to the humble wormwheel.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of wormwheel
Wormwheel is an English compound formed from “worm” and “wheel.” In the mechanical sense, a worm is named for its slender, spiral form, which resembles a worm. The elements are Germanic in origin: “worm” continues Old English wyrm, while “wheel” continues Old English hwēol; the compound became established within the technical vocabulary of mechanical engineering.
How wormwheel is actually used
This is a specialized mechanical-engineering term and is uncommon in general prose. The alternative open spelling “worm wheel” is also encountered, particularly in technical writing.
Easily confused with wormwheel
In machinery, a worm is the screw-like member that drives the wormwheel; the wormwheel is the toothed wheel with which it meshes.