automatic transmission

A mechanism of the drivetrain which takes the power from the engine and transfers it to the driveshaft or wheels. Without using a clutch, it uses a torque converter and fluid coupler to change the gear ratio. It automatically effects gear changes to meet varying road and load conditions. Gear changing is done through a series of oil operated clutches and bands.

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • Automatic transmission — An automatic transmission (commonly AT or Auto ) is an automobile gearbox that can change gear ratios automatically as the vehicle moves, freeing the driver from having to shift gears manually. Similar but larger devices are also used for heavy… …   Wikipedia

  • automatic transmission — noun a transmission that automatically changes the gears according to the speed of the car • Syn: ↑automatic drive • Hypernyms: ↑transmission, ↑transmission system * * * noun : a usually hydraulic or pneumatic mechanism whereby a motor vehicle… …   Useful english dictionary

  • automatic transmission — an automotive transmission requiring either very little or no manual shifting of gears. Also called automatic, automatic drive. [1945 50] * * * ▪ mechanics       arrangement of gears, brakes, clutches, a fluid drive, and governing devices that… …   Universalium

  • automatic transmission — UK / US noun [countable/uncountable] Word forms automatic transmission : singular automatic transmission plural automatic transmissions a system in which the gears of a car change by themselves without any action by the driver …   English dictionary

  • automatic transmission — automatinė pavarų dėžė statusas T sritis automatika atitikmenys: angl. automatic transmission vok. automatisches Getriebe, n rus. автоматическая коробка передач, f pranc. boîte de vitesses automatique, f; transmission automatique …   Automatikos terminų žodynas

  • automatic transmission — N UNCOUNT A car that is fitted with automatic transmission has a gear system in which the gears change automatically …   English dictionary

  • automatic transmission — automatic trans mission n [U and C] a system that operates the ↑gears of a car without the driver needing to change them …   Dictionary of contemporary English

  • automatic transmission — automatic trans mission noun count or uncount a system in which the GEARS of a car change by themselves without any action by the driver …   Usage of the words and phrases in modern English

  • automatic transmission — noun A mechanical transmission which shifts gears automatically in response to speed and/or load, rather than requiring the operator to do so manually; an automatic gearbox. Ant: manual transmission, stickshift, standard transmission …   Wiktionary

  • automatic transmission — (in a car) gear system that changes gears automatically (as opposed to a manual transmission) …   English contemporary dictionary

  • automatic transmission — automat′ic transmis′sion n. aum an automotive transmission requiring either very little or no manual shifting of gears • Etymology: 1945–50 …   From formal English to slang

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