Article | REF: BM2582 V1

Automotive transmissions - Role and determination of gear ratios

Authors: Elian BARON, Philippe PESCAROU

Publication date: July 10, 2011, Review date: June 29, 2023

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3. Gearbox ratio selection

Gear selection is not as straightforward as it might first appear. It calls on objective considerations, such as the vehicle's maximum speed in the top gear, but also on subjective observations linked to driving pleasure, as in the case of gear ratios. Added to this are constraints relating to pollutant emissions and fuel consumption, making the choice of gear ratios a delicate compromise.

3.1 Notions of gear ratio, opening and ratio length

The gear ratio i bn (the index n defining the selected ratio) of a gearbox is defined as the ratio of the input shaft speed (primary shaft at motor angular speed ω m ) to the output shaft speed (secondary shaft, angular speed ω...

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Gearbox ratio selection