Pedally propelled drive with torque relief system and method for controlling gear shifting

Abstract

A pedal-driven vehicle drive system (1) and method for controlling gear shifting, the pedal-driven vehicle drive system comprising: a crankshaft (3); a gear system (10) having a plurality of selectable gear ratios, wherein the gear system has a gear input shaft (10a) and a gear output shaft (10b), and is configured to provide an output torque on the gear output shaft (10b) in the output torque direction when an input torque is present on the gear input shaft (10a) in the input torque direction; and a torque release mechanism (50) configured to operate in a free-running mode and a bypass mode, wherein in the free-running mode the torque release mechanism (50) transmits a first torque from the crankshaft (3) to the gear input shaft (10a) in the input torque direction, and in the bypass mode the torque release mechanism transmits at least some of the first torque to the gear output shaft (10b) in the output torque direction. A pedally propelled vehicle drive system (1) and method for controlling a gear shift, comprising a crankshaft (3), a gear system (10) with multiple selectable gear ratios, wherein the gear system has a gear input shaft (10a) and a gear output shaft (10b), and is configured to provide an output torque in an output torque direction on the gear output shaft (10b) when an input torque in an input torque direction is present on the gear input shaft (10a), and a torque relief mechanism (50) configured to operate in a free running mode wherein the torque relief mechanism (50) transfers a first torque from the crankshaft (3) to the gear input shaft (10a) in the input torque direction, and bypass mode where at least some of the first torque is transferred by the torque relief mechanism to the gear output shaft (10b) in the output torque direction.

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