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Cutaway view of a 2007 Toyota AA80E hydraulic automatic Typical 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.
The Powerglide is a two-speed automatic transmission designed by General Motors.It was available primarily on Chevrolet from January 1950 [1] through 1973, although some Pontiac models also used this automatic transmission after the fire at the Hydra-Matic factory in 1953.
The parking pawl locks the transmission's output shaft to the transmission casing by engaging a pawl (a pin) that engages in a notched wheel on the shaft, stopping it (and thus the driven wheels) from rotating. The main components of a parking pawl mechanism are the parking gear, parking pawl, actuator rod, cam collar, cam plate, pivot pin, and ...
The Automatic Safety Transmission (AST) was a tangent outgrowth of this work. The AST was a semi-automatic transmission using planetary gears and conventional friction clutch, requiring the driver to use the clutch to shift into or out of gear, but not between the two forward gears. Oldsmobile offered the AST from 1937 to 1939, while Buick ...
Aisin automatic transmissions are manufactured by Aisin-Warner (AW) which was established in 1969 as a joint venture between Aisin and BorgWarner.While Aisin Seiki manufactures a variety of automotive components including automatic transmissions for heavy duty vehicle applications, Aisin AW manufactures automatic transmissions for light vehicle applications, including hybrid electric vehicle ...
In an automatic transmission, the role of the clutch is performed by a torque converter. However, the transmission itself often includes internal clutches, such as a lock-up clutch to prevent slippage of the torque converter, in order to reduce the energy loss through the transmission and therefore improve fuel economy. [17]