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A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear). Its main purpose is to translate the motion of two perpendicular axes or to translate circular motion to linear motion (example: band type hose clamp ).The two elements are also ...
The worm wheel is a gear wheel with helical teeth, cut at an angle matching the worm. The worm always drives the worm wheel round, it is never the opposite way round, because the system tends to lock and jam.
The worm wheel is similar to a helical gear; however, the tooth surface is produced in a concave shape in order to improve the surface contact area with the worm. Worms are produced either as an integral part of a shaft or they are produced with a bore in order to be fixed to a shaft.
In this case, the tooth winds around the worm shaft like the thread of a screw. The mating gear to the worm is the worm gear. Such a gearbox, consisting of worm and worm wheel, is generally referred to as a worm drive. The worm can be regarded as a special case of a helical gear.
A worm gear is a type of staggered shaft gear that facilitates motion between shafts by utilizing threads cut into a cylindrical bar, allowing for speed reduction. This gear system consists of two main components: the worm and the worm wheel.
A worm gear is used when a large speed reduction ratio is required between crossed axis shafts which do not intersect. A basic helical gear can be used but the power which can be transmitted is low. A worm drive consists of a large diameter worm wheel with a worm screw meshing with teeth on the periphery of the worm wheel.
Worms and worm gears are gear sets that offer high gear reduction and torque multiplication with a small footprint. A worm drive is a cylindrical gear with a shallow spiral thread that engages the worm gear in a non-intersecting, perpendicular axes configuration.