(in a car) gear system that changes gears automatically (as opposed to a manual transmission)
An automatic transmission (commonly abbreviated as "AT") is an
automobile gearbox that can change
gear ratios automatically as the vehicle moves, thus freeing the driver from having to shift gears
manually (similar but larger devices are also used for
railroad locomotives).Most automatic transmissions have a set selection of possible gear ranges, often with a
parking pawl feature that will lock the output shaft of the transmission.However, some simple machines with limited speed ranges and/or fixed engine speeds only use a
torque converter to provide a variable gearing of the engine to the wheels. Typical examples include
forklift trucks and some modern
lawn mowers.
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