Ever-Power Industry Co.,
Ltd.
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Worm and worm
wheel
A gear which has one tooth
is called a worm. The tooth is in the form of a screw thread. A worm wheel
meshes with the worm. The worm wheel is a helical gear with teeth inclined so
that they can engage with the thread – like worm. Like the crossed helical
gears, the worm and worm wheel transmit torque and rotary motion through a right
angle. The worm always drives the worm wheel and never the other way round. The
mechanism locks if the worm wheel tries to drive the worm. Worm mechanisms are
very quiet running. An example of a worm and worm wheel is shown on the right
hand side below. An application of the worm and worm wheel used to open lock
gates is shown on the left hand side below.
Worm and worm
wheel
