Type of motor vehicle transmission that automatically changes gear ratio as the vehicle moves
Cutaway view of a 2007 Toyota AA80E hydraulic automaticTypical gear selector for an automatic transmission
An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. Vehicles with internal combustion engines, unlike electric vehicles, require the engine to operate in a narrow range of rates of rotation, requiring a gearbox, operated manually or automatically, to drive the wheels over a wide range of speeds.
The most common type of automatic transmission is the hydraulic automatic, which uses a planetary (epicyclic) gearset, hydraulic controls, and a torque converter. Other types of automatic transmissions include continuously variable transmissions (CVT), automated manual transmissions (AMT), and dual-clutch transmissions (DCT).
The 1904 Sturtevant "horseless carriage gearbox" is often considered to be the first true automatic transmission.[1][2][failed verification] The first mass-produced automatic transmission is the General Motors Hydramatic four-speed hydraulic automatic, which was introduced in 1939.
Automatic transmissions are also found in some heavy commercial vehicles, particularly those which are subject to intense stop/start operation such as buses and waste collection vehicles.
^"Automatic Transmissions- A Brief History". AutoServiceExperts. 2003. Archived from the original on 2020-04-18.
^Hearst Autos Research (13 April 2020). "What is an Automatic Car?". Car and Driver. Archived from the original on 2020-04-17.
and 22 Related for: Automatic transmission information
An automatictransmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver...
Automatictransmission fluid (ATF) is a specialized hydraulic fluid that is essential for the proper functioning of vehicles equipped with automatic transmissions...
manual transmission (AMT) is a type of transmission for motor vehicles. It is essentially a conventional manual transmission equipped with automatic actuation...
The ZF 8HP transmission is ZF Friedrichshafen AG's trademark name for its 8-speed automatictransmission models for longitudinal engine applications....
manual transmissions for current vehicles. The alternative to a manual transmission is an automatictransmission; common types of automatictransmissions are...
of automatic FWD/RWD/4WD/AWD transmissions built by Aisin-Warner. They share much in common with Volvo's AW7* and Aisin-Warner's 03-71* transmissions, which...
Motors is an innovator of automatictransmissions, introducing the Hydra-Matic in 1940. This list includes some GM transmissions. The GM Hydra-Matic was...
dual-clutch automatictransmission, produced by the Ford Motor Company. The older Ford PowerShift gearboxes were built by Getrag Ford Transmissions, a joint-venture...
An automatictransmission system (ATS) is an automated system designed to keep a broadcast radio or television station's transmitter and antenna system...
Allison Transmission Holdings Inc. is an American manufacturer of commercial duty automatictransmissions and hybrid propulsion systems. Allison products...
designed 10-speed automatic that uses planetary gears. Honda's older transmissions such as the Hondamatic semi-automatictransmission and its successors...
manual transmission; instead using either a hydraulic automatictransmission, or a belt-driven or chain-driven continuously variable transmission. Underbones...
The Ford C3 transmission and its descendants are a family of light-duty longitudinal automatictransmissions built by the Ford Motor Company. The Bordeaux...
produced a large number of automatictransmissions for many auto makers. The first Nissan/Jatco transmission, the Jatco 3N71 transmission, used a simple naming...
Corporation's U family is a family of automatic front-wheel drive/rear-wheel drive/four-wheel drive transmissions found in later vehicle models. This is...
The AP automatictransmission is a 4-speed automatictransmission unit developed by Automotive Products and the British Motor Corporation specifically...
The Ford 8F transmission is a family of automatictransmissions with eight forward speeds for light-duty transversely-mounted applications. It is designed...
a major[citation needed] manufacturer of automobile transmissions. Aisin automatictransmissions are manufactured by Aisin Seiki and Aisin AW, formerly...
List of automatic, dual clutch automatic, and manual transmissions and transaxles used in vehicles manufactured by Ford Motor Company. 1950–1965 Ford-O-Matic...
This is a list of transmissions used in Toyota vehicles. The A-series are 2- to 10-speed automatictransmissions for front wheel drive, all wheel drive...
to control electronic automatictransmissions. Similar systems are used in conjunction with various semi-automatictransmissions, purely for clutch automation...
The AOD (automatic overdrive) is a four-speed automatictransmission, with the 4th gear as overdrive. Introduced in 1980, it was Ford's first four-speed...
Global Information
