Internal bicycle hub transmission with a clutch that rotates and

Details Internal bicycle hub transmission with a clutch that rotates and Internal bicycle hub transmission with a clutch that rotates and

1998-05-06

1999-07-27

Wright, Dirk

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural drive ratios other than unity

B62M 1116

Patent

active

059281030

ABSTRACT:
An internal hub transmission for a bicycle includes a hub axle having an axle axis for retaining the transmission to a bicycle frame, a driver rotatably supported relative to the hub axle, an output member rotatably supported relative to the hub axle, and a planet gear mechanism. The planet gear mechanism includes a sun gear disposed around the hub axle, a gear frame rotatably supported relative to the hub axle, a planet gear rotatably supported on the gear frame and meshing with the sun gear, and a ring gear rotatably supported relative to the hub axle and meshing with the planet gear. A first one-way clutch disposed in a transmission path between the driver and the output member, and a second one-way clutch disposed in a transmission path between the driver and the ring gear. A clutch member is supported on the axle for selectively changing a transmission path between the driver and the output member, wherein the clutch member rotates around the axle in response to rotation of the driver and moves axially relative to the hub axle. A clutch control component provides movement of the clutch member in the direction of the axle axis and engages the clutch member for converting rotational motion of the clutch member into motion of the clutch member in the direction of the axle axis. This axial motion assists the shifting operation by overcoming the frictional force of the transmission components.

REFERENCES:
patent: 4240533 (1980-12-01), Fukui
patent: 4276973 (1981-07-01), Fukui
patent: 5078664 (1992-01-01), Nagano
European Search Report for EP 98108378.5, dated Dec. 7, 1998.

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