Patent ID: 8905214

Claim:
An electric hub unit comprising: a hub being a hollow hub and composed of first casing and a second casing, an electric unit located between the first and second casings, an axle extending through two respective centers of the first and second casings, the first casing having a reception recess defined in one side thereof and multiple notches defined in an inner periphery of the reception recess, a first extension and a second extension extending axially from the first casing and outward in opposite directions, a bearing located in an inside of the second extension; a socket unit having a tubular portion which has a stepped portion extending radially from outside of the tubular portion; and a ratchet unit having a base and a ratchet ring, the base being located adjacent to the stepped portion and having multiple pawls, the ratchet ring having multiple teeth which are located corresponding to the notches, the ratchet ring having multiple ratchet teeth defined in an inner periphery thereof, the ratchet ring located in the reception recess, the teeth engaged with the notches, the socket unit mounted to an outer side of the first casing and mounted adjacent to said first casing on the axle, the pawls engaged with the ratchet teeth, a bearing and a first plate located between the stepped portion of the tubular portion and the first extension; wherein the first casing has multiple ribs extending radially from the inner periphery thereof and located around the second extension, each of the ribs has a thickness which is narrowed toward a direction away from the second extension.