Transmission Principle of Worm Gear Reducer

Worm gear reducer is a commonly used deceleration transmission device, and its transmission principle is mainly through the friction transmission between the worm and the worm wheel to realize deceleration.

Specifically, the worm is a cylinder with helical projections, used in conjunction with the worm wheel, which is a gear similar in shape to a disk, and the tooth groove of the gear is surrounded by the helical projections of the worm. The contact surface of the worm and the worm wheel forms a spiral friction transmission surface, and the rotation of the worm wheel is driven by the rotation of the worm to achieve the purpose of deceleration.

Due to the relationship between the helix angle of the worm wheel groove and the number of teeth of the worm wheel groove, for every rotation of the worm wheel, the worm can only rotate a certain angle, so the worm gear reducer can achieve a large reduction ratio. At the same time, due to the friction transmission between the worm and the worm wheel, the torque output from the worm wheel can be transferred to the worm, thus realizing the high torque output of the reducer. Therefore, worm gear reducers are widely used in applications requiring high torque in low-speed output situations, such as cranes, conveyors and other mechanical equipment.