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.
FactSnippet No. 962,364 |
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.
FactSnippet No. 962,364 |
The first mass-produced automatic transmission is the General Motors Hydramatic four-speed hydraulic automatic, which was introduced in 1939.
FactSnippet No. 962,365 |
Hydraulic automatic transmission uses planetary gearsets instead of the manual transmission's design of gears lined up along input, output and intermediate shafts.
FactSnippet No. 962,366 |
Valve body inside the Automatic transmission is responsible for directing hydraulic pressure to the appropriate bands and clutches.
FactSnippet No. 962,367 |
However, the Automatic transmission was prone to sudden failure, due to the Automatic transmission being unable to withstand forces from the abrupt gear changes.
FactSnippet No. 962,368 |
An early patent for the automatic transmission was granted to Canadian inventor Alfred Horner Munro of Regina in 1923.
FactSnippet No. 962,369 |
The transmission was sensitive to engine throttle position and road speed, producing fully automatic up- and down-shifting that varied according to operating conditions.
FactSnippet No. 962,370 |
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.
FactSnippet No. 962,371 |
Dual-clutch Automatic transmission uses two separate clutches for odd and even gear sets.
FactSnippet No. 962,372 |
An early example of this Automatic transmission was introduced with the Hudson Commodore in 1942, called Drive-Master.
FactSnippet No. 962,373 |
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.
FactSnippet No. 962,374 |