HUB MOTOR

A hub motor suitable for installation on bicycles and includes an axle, a stator, a rotor, a casing, a sealing ring, and a compression ring. The axle is fixed to a frame of the bicycle. The stator is fixed to the axle. The rotor is rotatably sleeved on the axle and pivots around the stator with the axle as an axis. The casing is rotatably sleeved on the axle and pivots around the rotor with the axle as an axis. The casing forms an accommodating space, an opening, and a first through-hole. The opening is closed by a side cover. The accommodating space accommodates the stator and the rotor through the opening. The side cover has a second through-hole. A convex ring is formed around the second through-hole. The sealing ring covers the convex ring and has an outer ring part, an inner ring part, and a connecting part.