Gearbox

A gearbox is the system of gears in an engine or a vehicle. COLLOCATIONS: manual ~five-speed ~six-speed ~ The car also had wider drum brakes and a five-speed gearbox. The gear ratios of a manual gearbox can be optimized to improve the fuel economy of a passenger car.The gears are mounted on shafts, which are supported by and rotate via rolling element bearings. The gearbox is a mechanical method of transferring energy from one device to another and is used to increase torque while reducing speed.A gear is a simple, rotating machine which usually has teeth (cogs). noun. When they connect to another gear, they transmit torque, which is like a twisting force.