Patent ID: 8142046

Claim:
A combined device for power generation and illumination mounted on the wheel axle of a bicycle, comprising: a) a head lamp, including a lamp holder, a circuit board installed in a containing space of the lamp holder, and a lamp installed at a front distal end, and electrically coupled to the circuit board, and the lamp holder having a hollow installation base disposed at the bottom of the lamp holder; b) a power generator, including a housing for sheathing the hollow installation base; a stator installed at an internal side of the housing, a rotor coupled to an interior of the stator, a rear cover fixed at a rear side of the housing, and a front cover fixed at a front side of the housing, such that the power generator is connected to the hollow installation base, and a front end of an axle center of the rotor is protruded from the front cover; and c) a transmission device, including a connecting base, a connecting hole formed at the center of the transmission device, a gear holding slot extended from a lateral side of the transmission device; a wheel shaft fixing cover, secured onto the connecting hole by a screw, and having a through hole formed at the center of the wheel shaft fixing cover and sheathed and fixed onto an external end of the wheel shaft of a bicycle; a gear pressure plate, being circular in shape and installed at an external periphery of the wheel shaft fixing cover; a driving gear, installed in the connecting base, and disposed at an external periphery of the gear pressure plate, and capable of being rotated; a power generator roller, installed onto the axle center of the rotor protruded from the front cover, and directly or indirectly driven by the driving gear; a driving ring, coupled to a front side of the driving gear by a plurality of support pins, and having a lug disposed at an external periphery of the driving ring and coupled to the spoke; thereby, when the bicycle is moving, the wheel is rotated to synchronously drive the driving ring and driving gear to rotate, and further drive the rotor of the power generator to rotate and generate electric power, and a power cord is connected externally from the stator to the circuit board of the head lamp for supplying required electric power.