Infinitely Variable Internally Geared Hub Transmission

Abstract: A continuously variable transmission for a vehicle, in particular a bicycle, assists a user under a variety of conditions. The transmission combines the reliability and efficiency of gears with the ability to continuously and infinitely vary the gear ratio of the transmission. The transmission can have a planetary gear set with planetary gears that receive an input torque via a carrier, a sun gear, and a ring gear that receives an output torque. An electric motor can be engaged with the sun gear to continuously vary the angular velocity of the sun gear and, thus, continuously vary the gear ratio of the transmission to increase or decrease the output torque at the ring gear. The ring gear can turn a rear wheel of a bicycle, and the transmission provides a potentially infinite number of gear ratios to suit a user.

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