Patent ID: 8245804

Claim:
Electrically motorised bicycle hub comprising a stationary wheel shaft and a hub housing, supported rotatingly there around, and enclosing a rotor which can rotate around the stationary wheel shaft and comprises a first part, parallel to the wheel shaft and carrying a ring of permanent magnets which cooperate with a ring of stator windings, supported by a cylindrical winding carrier, and a second part, perpendicular to the first part, being supported rotatingly around the wheel shaft and connected to said first part by means of a transition part, and furthermore comprising a wheel transmission, driven by the second rotor part and of which the output drives the hub housing with a reduced rotation speed, wherein the wheel transmission is accommodated in the space present between the stator windings and the wheel shaft; wherein a cylindrical part of the cylindrical winding carrier, supporting the windings, is connected via a connecting part, which is perpendicular to the wheel shaft fixed to this shaft, said connecting part accommodating a ring of auxiliary shafts, each being parallel to the axis of the wheel shaft, and each carrying at a first end, directed towards the second rotor part a first gear wheel and at its opposite, second, end a second gear wheel, the first gear wheels meshing with outer teeth provided on a first cylindrical part protruding from the second rotor part at a short distance from the wheel shaft, the second gear wheels meshing with inner teeth provided on a second cylindrical part protruding axially from an opposite hub wall, opposite thereto; and wherein a free end of the first rotor part, or the transition part, is rotatingly supported by the opposite hub wall.