Worm Gear Sys

  • A worm drive is a gear arrangement in which a worm meshes with a worm wheel.
  • The two elements are also called the worm screw and worm gear. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm wheel, or the worm drive as a unit.
  • With one rotation of the worm the worm thread pushes straight on by one position. The worm gear is thus moved on by one tooth. Compared to a toothed wheel, in this case the worm actually behaves as if it had only one tooth around its circumference.
  • An electric motor or engine applies rotational power via to the worm. The worm rotates against the wheel, and the screw face pushes on the teeth of the wheel. The wheel is pushed against the load.