When Was the Synchromesh Gearbox Invented?

The Synchro-Mesh Transmission
Thompson's 1918 invention of a synchromesh manual transmission using a tapered cone synchronizer to prevent gear clash (US Patent US1435430 in March 1922) would make shifting a manual transmission faster, easier and safer.

When did synchromesh become standard?

The first car to use a manual transmission with synchromesh was the 1929 Cadillac, however most cars continued to use non-synchronous transmissions until at least the 1950s. In 1947, Porsche patented the split ring synchromesh system, which went on the become the most common design for passenger cars.

Who invented synchromesh gears?

Earl Thompson. Earl A. Thompson, who as a youth in Portland invented the synchromesh transmission and later led development of the Hydra-Matic transmission will be honored in Detroit Wednesday by receipt of the Elmer A. Sperry Award.

Sarah Jenkins

Sarah Jenkins

Senior Technology Editor & AI Specialist

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.