Multiple speed transmission for pedal powered vehicles

Machine element or mechanism – Gearing – Interchangeably locked

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Details

74372, F16H 308

Patent

active

047167777

ABSTRACT:
A ten-speed transmission which is located inside the hub of the driving wheel of a pedal powered vehicle, and which includes a pedal drive shaft mounted in bearings on the axis of the wheel, is used to provide a compact, low maintenance alternative to the chain and derailleur system used for conventional multiple speed bicycles. Three idler shafts divide the pedal torque between three gear teeth permitting the gear widths to be one third that which would be required for a transmission using a single idler shaft. The resulting narrow gears coupled with a shift arrangement which adds nothing to the transmission width, permits the width between the pedals to be approximately that of a conventional chain driven bicycle. This transmission is particularly well suited for use in recumbent front wheel drive bicycles and tricycles.

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