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[44] [45] [46] Another early example of this transmission system was introduced in the 1955 Citroën DS, which used a 4-speed BVH transmission. This semi-automatic transmission used an automated clutch, which was actuated using hydraulics. Gear selection also used hydraulics, however, the gear ratio needs to be manually selected by the driver.
In the early mass-produced automobiles, the standard transmission design was manual: the combination of gears was selected by the driver through a lever (the gear stick) that displaced gears and gear groups along their axes. Starting in 1939, cars using various types of automatic transmission became available in the US market. These vehicles ...
This was provided to allow engine braking on downhills or prevent the use of overdrive gears when towing and was typically achieved using positions such as "3", "2", and "1" on the gear selector. An automatic transmission with a manumatic function provides a greater level of control by allowing the driver to request an upshift or downshift at a ...
Automated manual transmissions can be semi-automatic or fully-automatic in operation. Several different systems to automate the clutch and/or shifting have been used over the years, but they will generally use one of the following methods of actuation for the clutch and/or shifting: hydraulic or electro-hydraulic actuation, [12] electro-mechanical, [13] pneumatic, [6] [14] [15] electromagnetic ...
Pre 2008 model year WRX STi 6MT versions utilizes a self-contained oil system with a trochoidal oil pump mounted in the rear of the transmission case. This capability was removed for 2008 and later years. Subaru chose a simplified splash/scraper lubrication system.
In a vehicle with an automatic transmission, the torque converter connects the prime mover to the automatic gear train, which then drives the load. It is thus usually located between the engine's flexplate and the transmission. The equivalent device in a manual transmission is the mechanical clutch.
Aisin and Toyota offer various 8-speed automatic transmissions for use in both longitudinal [a] [1] and transverse [b] [2] engine vehicles, based on a common, globally patented gearset concept. [a] [1] [b] [2] The Aisin TL-80SN (Toyota AA 80E/AA 80F/AA 81E) series is the world's first 8-speed automatic transmission for passenger cars. [3]
In addition, the transmission supports start-stop systems by including a spring-loaded hydraulic accumulator to engage the first-gear clutches upon restarting the engine. [6] The 8th gear ratio of the 9TXX corresponds to the 6th gear ratio of the 6T40, allowing lower engine speeds in 9th gear. [5]