Electric assisted bicycle and hub motor thereof

A hub motor being mounted on an axle assembly, the axle assembly including an axle rod and an axle sleeve, and an independent cassette flywheel being provided at one end of the axle sleeve where an end cover is located, a limiting sleeve being disposed outside of the cassette flywheel to prevent the cassette flywheel from detaching from the axle sleeve, and an anti-rotation piece for preventing rotation of the axle sleeve being provided at another end of the axle sleeve where a wheel hub is located;

• wherein a knurling pattern for preventing rotation of the axle sleeve is provided on an end surface of the limiting sleeve, the anti-rotation piece includes a locking hole and an anti-rotation head, the anti-rotation piece is fixed on the axle sleeve through the cooperation of the locking hole and a locking groove provided on the axle sleeve, the anti-rotation head is configured to cooperate with fork ends of a front fork or a rear fork of a bicycle to prevent the rotation of the axle sleeve.