Porsche 911 SC engine with 915 gearbox
Automobile gearbox
A transmission, also known as a gearbox, is a mechanism used to change the speed and torque from the engine. It can fix or shift the transmission ratio between the output shaft and input shaft. The gearbox consists of a variable transmission mechanism and a control mechanism, and some cars also have a power output mechanism. Most transmission mechanisms use ordinary gear transmission, while others use planetary gear transmission. Ordinary gear transmission mechanisms generally use sliding gears and synchronizers.
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