Abstract

The present invention relates to a bicycle gearbox (2000, 3000) comprising a continuously variable transmission (2300) comprising an input pulley (1310), an output pulley (1330) and a V-belt (1320) connecting the input pulley (1310) and the output pulley (1330), the continuously variable transmission (2300) further comprising an input pulley axis (1314), on which the input pulley (1310) is mounted, the input pulley (1310) comprising a fixed sheave (1312) and a sliding sheave (1313), the sliding sheave (1313) being configured to slide on the input pulley axis (1314), and torque biasing means (2315, 3315A, 3315B), configured to bias the sliding sheave (1313) towards the fixed sheave (1312), when torque is applied from the input pulley axis (1314) to the input pulley (1310).

IPC Classes  ?

• B62M 9/08 - Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically-mounted or elliptically-shaped driving or driven wheelTransmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like with expansible driving or driven wheel
• B62M 21/00 - Transmissions characterised by use of resilient elements therein
• F16H 55/56 - Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
• B62M 11/02 - Transmissions characterised by use of interengaging toothed wheels or frictionally-engaging wheels of unchangeable ratio

Abstract

The present invention relates to a bicycle gearbox (1000) comprising a housing (1100), which comprises two crankshaft openings (1110), configured to allow a crankshaft 1600 to pass through it. The gearbox further comprises a continuously variable transmission (1300) with an input pulley (1310), an output pulley (1330) and a V-belt (1320) connecting them, a chain sprocket (1500), configured to connect to a chain connecting to the rear wheel, and input gears as well as output gears. The input gears (1200) are configured to connect the crankshaft (1600) to the input pulley (1310) while increasing a rotational speed of the crankshaft (1600) and provide the increased rotational speed to the input pulley (1310). The output gears (1400) are configured to connect the output pulley (1330) to the chain sprocket (1500), while reducing a rotational speed of the output pulley (1330) and provide the reduced rotational speed to the chain sprocket (1500). In the invention, the output pulley (1330) is coaxial with the crankshaft (1600).

IPC Classes  ?

• B62J 45/411 - Torque sensors
• B62M 21/00 - Transmissions characterised by use of resilient elements therein
• B62M 9/08 - Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically-mounted or elliptically-shaped driving or driven wheelTransmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like with expansible driving or driven wheel
• F16H 55/00 - Elements with teeth or friction surfaces for conveying motionWorms, pulleys or sheaves for gearing mechanisms
• F16H 61/00 - Control functions within change-speed- or reversing-gearings for conveying rotary motion
• B62K 19/34 - Bottom brackets
• B62M 11/06 - Transmissions characterised by use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with spur gear wheels
• B62M 11/14 - Transmissions characterised by use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears