#O2J TRANSMISSION WIKIPEDIA MANUAL#
Some of these systems are also referred to as clutchless manual systems. Many early versions of these transmissions were semi-automatic in operation, such as Autostick, which automatically control only the clutch, but still require the driver's input to initiate gear changes. Main articles: Automated manual transmission and Clutchless manual transmissionĪn automated manual transmission (AMT) is essentially a conventional manual transmission that uses automatic actuation to operate the clutch and/or shift between gears. In the case of a wind turbine, the first stage of the gearbox is usually a planetary gear, to minimize the size while withstanding the high torque inputs from the turbine. Examples of such transmissions are used in helicopters, wind turbines and power take-offs (PTOs) for tractors. The simplest transmissions used a fixed ratio to provide either a gear reduction or increase in speed, sometimes in conjunction with a change in the orientation of the output shaft. Electric vehicles typically use a single-speed or two-speed transmission.įixed-ratio transmissions Transmission for a Bristol Sycamore helicopter Most currently-produced passenger cars with petrol or diesel engines use transmissions with 5-8 forward gear ratios and one reverse gear ratio. Many transmissions have multiple gear ratios, but there are also transmissions that use a single fixed gear ratio. Epicyclic gearing diagram, as used in hydraulic automatic transmissionsĪ transmission (also called a gearbox) is a mechanical device which uses gears to change the speed or direction of rotation in a machine.
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