A Worm Gear is an inclined plane wrapped around a central axle. Itis a gear with one or more teeth in the form of screwed threads.
Worm Gears are made of two parts: the pinion and the worm gear. The pinion has small number of teeth and they wrap around the pitch cylinder. The worm gear has concave faces to fit the curvature of the worm in order to provide line of contact instead of point of contact.They are cut helically for better mating. Worm gears can provide a high angular velocity between non-intersecting shafts at right angles.
They are capable of transmitting high tooth loads, the only disadvantage is the high sliding velocities across the teeth. They provide ultimate power ratio.
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