Abrégé

The shiftable bottom bracket gear train according to the invention for a bicycle or the like comprises a bottom bracket tube, a gear train housing having an associated sprocket and a disk arranged parallel thereto, and a drive shaft, which penetrates the bottom bracket tube in the axial direction and is operatively connected to pedal cranks and in which a shifting axle is arranged, which is connected to a coupling piece and can be actuated from the outside by means of a shifting element. In the shiftable bottom bracket gear train, the torque support of the gear train engages on the bottom bracket tube (1) or on an adapter (2) inserted in the bottom bracket tube (1), and is implemented by using screws (8) or screw connections (4,5,12), pins (9, 17), cams (14), or clamps (13).

Classes IPC  ?

• F16H 48/12 - Transmissions différentielles sans engrenages à mouvement orbital
• F16H 35/06 - Transmissions conçues pour permettre un mouvement relatif entre leurs supports sans effets nocifs

Abrégé

The present invention relates to a toothed belt wheel (1), in particular for bicycles or motorcycles, for the transmission of torque from the crankshaft or engine shaft to the rear wheel. The toothed belt wheel (1) consists of individual disc-shaped elements (2, 3, 4; 10, 11, 12) which are connected fixedly to one another to form a unit. That toothed belt disc (9) of the toothed belt wheel (1) which is intended for the engagement of a toothed belt is assembled from at least two elements (2, 3; 10, 11), namely a carrier disc (2) and one or more tooth discs (4). In addition, a flanged disc (3) can also be arranged on the toothed belt disc (9).

Classes IPC  ?

• F16H 55/30 - Roues à chaînes
• F16H 55/17 - Roues dentées
• F16H 7/02 - Transmissions pour transmettre un mouvement rotatif par des organes flexibles sans fin par courroiesTransmissions pour transmettre un mouvement rotatif par des organes flexibles sans fin par courroies trapézoïdales