The types and advantages of enveloping worm gear and worm gear pairs produced in China mainly include the following: planar once enveloping toroidal worm gear and worm gear pairs; Planar quadratic enveloping toroidal worm gear pair; Conical surface secondary enveloping toroidal worm gear pair, etc. The enveloping toroidal worm gear developed from a straight or helical planar worm gear is called a planar enveloping toroidal worm gear. These specific tooth surface worm gears can be combined with their respective enveloping toroidal worm gears to form a worm drive, known as a planar first-order enveloping toroidal worm gear transmission. The straight tooth planar worm gear transmission was invented by Wildhaber of the American Gleason Company in 1922, and is used for large transmission ratio applications; The helical plane worm gear transmission was invented by Japan's Sato in 1952 and is suitable for medium and small transmission ratios, with a small transmission ratio of I=10. The formation process of the planar enveloping worm gear is called a primary enveloping.

Worm gear direction determination Worm gear direction determination Worm gear, helical gear, bevel gear, etc. For gears with spiral teeth, the direction and fit of the spiral are fixed. Spiral direction refers to when the central axis of a gear points up and down, and when viewed from the front, the direction of the gear teeth pointing to the upper right is "right rotation", and the direction pointing to the upper left is "left rotation".

The types and advantages of enveloping worm gear and worm gear pairs produced in China mainly include the following: planar once enveloping toroidal worm gear and worm gear pairs; Planar quadratic enveloping toroidal worm gear pair; Conical surface secondary enveloping toroidal worm gear pair, etc.