Fichtel & Sachs Ag

Horst Schulz

Werner Steuer

Ewald Eisend

Karl-Heinz Schmidt

Josef Flosser

Reinhard Kessler

Erich Hild

Karl-Heinz Loffler

Karlheinz Loffler

In a multiple speed hub with coaster brake for a bicycle, unintentional jamming of the brake is prevented by the provision of novel pawl clutches interposed between a planetary transmission and the hub shell. The recesses of pawl carriers pivotally receiving the clutch pawls are circumferentially oversized to permit limited circumferential movement of each pawl between a driving position and an idling position.

Multiple speed hub with coaster brake

The transmission ratio of a multiple-speed hub for a bicycle or like vehicle may be changed by axially shifting the ring gear of a planetary gear transmission in the hub shell against the restraint of a return spring. A pawl on the ring gear and/or ratchet teeth on the hub shell have cooperating engagement faces which are obliquely inclined relative to the hub axis in such a manner that the driving force transmitted by the pawl to the ring gear has an axial component in the direction of the return spring action, thereby further axially securing the ring gear in at least one speed position of the hub, minimizing avoidable clearances, and reducing wear of the gear elements.

Multiple-speed hub

The driver in a three-speed bicycle hub may be coupled alternatively with the planet carrier or the ring gear of the planetary gear transmission in the hub shell by means of radial arms on a coupling sleeve which is shifted axially between terminal positions of engagement with the carrier and the ring gear respectively for highest and intermediate transmission ratio. The engaged ring gear may further be shifted axially by the coupling sleeve from its normal position against the restraint of a spring to establish a third, lower transmission ratio. The coupling elements of the planet carrier and ring gear are normally closer to each other than the axial length of the coupling sleeve arms. The radial arms cammingly cooperate with coupling elements on the planet carrier and/or the ring gear to shift the arms automatically into a terminal position from any intermediate position in response to relative rotation of the associated transmission members.

Multiple speed hub for a bicycle and like vehicle

Growing community of inventors

Friedrichshafen, Germany

Horst Schulz