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Definition of Constant mesh gearbox

Constant mesh gearbox Definition from Science & Technology Dictionaries & Glossaries
Dictionary of Automotive Terms
A type of transmission in which all or most of the gears are always in mesh with one another, as opposed to a sliding-gear transmission, in which engagement is obtained by sliding some of the gears along a shaft into mesh. In a constant-mesh manual gearbox, gear ratios are selected by small clutches that connect the various gearsets to their shafts so that power is transmitted through them.