Worm wheel

The invention relates to the field of driving devices, and particularly provides a worm wheel. The worm wheel comprises a wheel body and second gear teeth, wherein the second wheel teeth are arrangedon the circumferential face of the wheel body, the second wheel teeth are cylinders extending along the radial directions of the worm wheel, and sliding friction or rolling friction is formed betweenthe second wheel teeth and spiral teeth; the wheel body comprises an outer wheel ring and an inner wheel ring, and the inner wheel ring and the outer wheel ring are connected through a plurality of spokes uniformly distributed around the center of the wheel body; a shaft hole is formed in the center of the inner wheel ring, and the second wheel teeth are arranged on the surface of the outer wheelring. The worm wheel is small in size, compact in structure, and can realize large-driving-ratio drive and large-torque output; and the worm wheel has the both advantages of gear drive and worm drive,and is simple in structure,