Patent ID: 7944098

Claim:
A generator structure for a bicycle hub comprising: a hub housing being interiorly defined with a receiving groove having an opening opened to one side thereof, the receiving groove being defined with an axle hole; an axle being provided with a middle connecting portion, and the axle being disposed in the hub housing and having one end extended out of the axle hole of the hub housing; a generator being fixedly disposed on the connecting portion of the axle and including: a coil unit having an outer periphery on which a coil is winded; a magnet group being formed by arranging an even number of magnets into an annular shape, the respective magnets being made of sintered NdFeB and having an N pole at one side thereof and an S pole at the other side thereof, the N poles and the S poles of each two neighboring magnets being alternately arranged, that is to say, the N poles and the S poles of the respective magnets located at the same side of the magnet group are alternately arranged into the annular shape, the magnet group being disposed on the outer periphery of the coil unit and combined to an inner periphery of the hub housing in such a manner that the magnet group doesn't rotate with the coil unit but rotates together with the hub housing; and two yoke iron groups each being formed by arranging plural yoke irons into an annular shape, each of the yoke irons being provided with at least one claw at an outer end thereof, the two yoke iron groups being oppositely combined together from both sides of the coil unit to enclose the coil unit, and the claws extending outwards from the outer periphery of the coil unit and being located opposite the respective magnets; and a hub cover being centrally defined with an axle hole and assembled to the opening of the receiving groove of the hub housing in such a manner that the other end of the axle being extended out of the axle hole of the hub cover, the hub cover fixing the magnet group on the hub housing located at the outer periphery of the coil unit; wherein the generator further includes two generator pressing plates and a stator nut, the axle is further provided with a protruding flange at one side of the connecting portion and a stator assembling portion at the other side of the connecting portion, the generator pressing plates are exteriorly pressed against the respective yoke iron groups, the coil unit of the generator and the two yoke iron groups are disposed on the connecting portion of the axle in such a manner that one of the two yoke iron groups is positioned against the flange, and the other of the two yoke iron groups is fixed by the stator nut which is screwed onto the stator assembling portion.