Speed-changing transmission hub for a bicycle

Details Speed-changing transmission hub for a bicycle Speed-changing transmission hub for a bicycle

1997-07-30

1999-01-05

Bonck, Rodney H.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

475288, 475339, 475341, F16H 356

Patent

active

058555307

ABSTRACT:
The present invention relates to a speed-changing transmission hub for a bicycle comprising: a central shaft; a controlling device; a planetary gear system, which comprises a planet gear holder, holding several planet gears; a second ring gear; a first ring gear; and two sun gears. Variations of speed are realized by separately fixing the sun gears of different diameters. There is no switching of input and no reversal of the rotation of the sun gears. The sun gears only need to be controlled by a one-way clutch guided by the controlling device, which is mounted on the central shaft. Thereby the arrangement is simplified and its weight is reduced.

REFERENCES:
patent: 4628769 (1986-12-01), Nagano
patent: 4721013 (1988-01-01), Steur et al.
patent: 4838122 (1989-06-01), Takamiya et al.
patent: 4854191 (1989-08-01), Nagano
patent: 4973297 (1990-11-01), Bergles
patent: 5078664 (1992-01-01), Nagano
patent: 5540456 (1996-07-01), Meier-Burkamp et al.
patent: 5562563 (1996-10-01), Shoge

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