Fluid-tight steplessly variable bicycle gearbox with integrated back pedal freewheel and linked pivoting suspension device

摘要

1. An infinitely variable bicycle drive integrated in a liquid-tight gear box housing (1) with tread crank and supported free-wheeling back pedal and articulated flexible spring member, with the tread crank shaft mounted in a bearing bracket (2) and supporting two bilaterally arranged eccentric cams (cam (4), an opposing cam (5)) where one tension belt each (11 and 12) is fixed or spring-mounted to a stationary clamp (8), guided via a take-up support roller (15) on a take-up arm (13), rests with variable looping angle (alpha) on the rollers (5 and 7) of the two cams and is reciprocally oscillated in a linear direction during rotation of the tread crank, where the two tension belts (11 and 12) are guided via two deflection rollers (16 and 17) on a down arm (19) towards their respective repetition wheels (20 and 21), reeled and anchored in the same direction in order to translate the reciprocating linear oscillation into oppositely directed reversible rotation, each repetition wheel (20, 21) having a gear (25, 24), the gears forming an engaging gear set, and an additional transmission gear (26, 27), where the one transmission gear (26) operates on a clockwise free wheeling drive (33) and the other transmission gear (27) on a counterclockwise free-wheeling drive (34), and the drive rings of these two free-wheeling devices (33, 34) form a continuously rotating common drive shaft (31), whereby the continuous rotation is transmitted via conical gears (32, K) to the drive member, and the looping angles (alpha) are varied by reciprocal swinging of the take-up roller (15) which is guided on a swing track, on the one hand, and the deflection rollers (16 and 17) guided on a swing track (39), on the other hand, such that the take-up and down arm (13 and 19) are swivel-mounted with bolts (40 and 41) to a double rocker arm (42).