A Liftless Electronic 100ms Shift System for Motorcycle-Engined Racecars
Date Published: 2002-12-02
Paper Number:2002-01-3322
DOI: 10.4271/2002-01-3322
Citation:
Radford, D., Scott, E., and Fitzhorn, P., "A Liftless Electronic 100ms Shift System for Motorcycle-Engined Racecars," SAE Technical Paper 2002-01-3322, 2002, doi:10.4271/2002-01-3322.
A number of racing series have seen an influx of motorcycle engines as basic powerplants which incorporate a performance oriented sequential shift transmission. However, due to common placement of the engine behind the driver, shift actuation can often become a difficult design issue. Further, the time of one up-shift can be 500 ms or more when the clutch is used, and manually unloading the transmission to allow shifting does not substantially reduce the time lost.
A lightweight, low cost electronic liftless shift system has been designed to overcome the problems of packaging and improve shift speed. The system uses a small 12v DC gearmotor, cam and follower to execute the up-shift and downshift, and a current sensor and programmable IC's are used to automatically unload the drivetrain for liftless up-shifts.
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