Worm and gear transmission pair

The utility model discloses a worm and gear transmission pair. The worm gear and worm transmission pair comprises a worm gear and a worm, wherein the worm gear is an involute tooth profile worm gear; a meshing groove of the involute tooth profile worm gear is designed to be a groove with a groove bottom with a larger arc radius, so that a transmission pair of the worm gear and a worm has the fault tolerance performance of a bevel gear and the fatigue resistance performance of a traditional worm gear, more lubricating grease can be contained, the tooth surface is lubricated more sufficiently, and the service life is prolonged. In the worm gear and worm transmission pair, more gaps are reserved between meshing tooth pairs of the worm gear and the worm, conjugate meshing of the worm gear and the worm is point contact, and meshing teeth adopt large tooth-shaped pressure angles, so that the worm gear and worm transmission pair has higher efficiency and bearing capacity compared with a traditional worm gear and wor