11 Facts About Automatic transmission


An automatic transmission is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions.

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The first mass-produced automatic transmission is the General Motors Hydramatic four-speed hydraulic automatic, which was introduced in 1939.

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Hydraulic automatic transmission uses planetary gearsets instead of the manual transmission's design of gears lined up along input, output and intermediate shafts.

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Valve body inside the Automatic transmission is responsible for directing hydraulic pressure to the appropriate bands and clutches.

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However, the Automatic transmission was prone to sudden failure, due to the Automatic transmission being unable to withstand forces from the abrupt gear changes.

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General Motors

An early patent for the automatic transmission was granted to Canadian inventor Alfred Horner Munro of Regina in 1923.

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The transmission was sensitive to engine throttle position and road speed, producing fully automatic up- and down-shifting that varied according to operating conditions.

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Electronics began to be more commonly used to control the Automatic transmission, replacing mechanical control methods such as spring-loaded valves in the valve body.

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Dual-clutch Automatic transmission uses two separate clutches for odd and even gear sets.

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An early example of this Automatic transmission was introduced with the Hudson Commodore in 1942, called Drive-Master.

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Consequently, in some jurisdictions, drivers who have passed their driving test in a vehicle with an automatic transmission are restricted from driving cars with manual transmissions.

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