Helical gear

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Helical gear in a vice
Worm gear (2-speed worm shaft )

The helical gear is a rotatable permanent screw - nut - connection . One of the two parts is rotatably but axially fixed, the other linearly displaceable in the frame stored . Both are connected via a movement thread .

The screw ( threaded spindle ) is either enclosed by a component with an internal thread or a sector of the screw thread drives a rack or a gearwheel ( worm wheel ) in the manner of a worm gear . The threaded spindle of a worm gear is also known as a worm shaft.

Application example

Helical gears are widely used machine elements when it comes to applying large forces or executing precise movements. Well-known examples that are familiar from everyday life:


  • A. Slider: gears . Second volume, spur gears and bevel gears with oblique teeth, Springer Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1957.
  • Herbert Wittel, Dieter Jannasch, Joachim Voßiek, Christian Spura: Roloff / Matek machine elements . 24th edition, Vieweg Verlag, Wiesbaden 2019, ISBN 978-3-658-26279-2 .

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