Most motorcycles use a sequential manual transmission. This function allows the driver to select the previous or next gear through the use of buttons or a lever (usually near the gear shifter or steering wheel) however, the mechanicals of the transmission are unrelated to a true sequential manual transmission. Ī sequential manual transmission is not to be confused with a "sequential" shifting function sometimes fitted to hydraulic automatic transmission, marketed with terms such as "Tiptronic" or "SportShift". The tracks deviate around the circumference and as the drum rotates, the selector forks are moved to select the required gear. Selector forks are guided by the tracks, either directly or via selector rods. On a sequential manual transmission, the shift lever operates a ratchet mechanism that converts the fore-and-aft motion of the shift lever into rotation of a selector drum (sometimes called a barrel) which has three or four tracks machined around its circumference. The use of dog clutches (rather than synchromesh) results in faster shift speeds than a conventional manual transmission. This restriction avoids accidentally selecting the wrong gear however, it also prevents the driver from deliberately "skipping" gears. shifting from first gear to second gear) or the previous gear (e.g., shifting from third gear to second gear), operated either via electronic paddle-shifters mounted behind the steering wheel or with a sequential shifter. It produces faster shift times than traditional synchronized manual transmissions, and restricts the driver to selecting either the next or previous gear, in a successive order.ĭesign Gear shift lever on a motorcycle (above the toe of the rider's boot)Ī sequential manual transmission is unsynchronized, and allows the driver to select either the next gear (e.g. Sequential manual transmission shifting animationĪ sequential manual transmission, also known as a sequential gearbox, or a sequential transmission, is a type of non-synchronous manual transmission used mostly for motorcycles and racing cars.
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