A gear system 100 for a pedal cycle comprises an epicyclic gear set 102 having a sun gear 104, one or more planet gears 106 meshed with the sun gear, and a ring gear 112 meshed with the one or more planet gear 106s. Each of the planet gears 106 is connected to a planet carrier. The sun gear 104 has a connecting portion for connecting to a component of the pedal cycle. The gear system 100 comprises a control arrangement 126 that is arranged to control a speed of rotation of the ring gear 112, so as to provide a variable gear ratio to the gear system. The ring gear 112 may be controlled using a motor, a generator or an escapement mechanism. Automatic control may be adapted to maintain near-constant pedalling cadence.
Gear system, pedal cycle, and method of retrofitting gear system
2022-07-06
Patent
Electronic Resource
English
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
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