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Double Declutch
Double-clutching (also called double de-clutching outside of the United States) is a method of shifting gears used primarily for vehicles with an unsynchronized manual transmission, such as commercial trucks and specialty vehicles. While double clutching is not necessary in a vehicle that has a synchronized manual transmission, the technique can be advantageous for smoothly upshifting in order to accelerate and, when done correctly, it prevents wear on the synchronizers which normally equalize transmission input and output speeds to allow downshifting. With this method, instead of pushing the clutch in once and shifting directly to another gear, the driver first engages the transmission in neutral before shifting to the next gear. The clutch is depressed and released with each change. A related downshifting/rev-matching technique is heel-and-toe shifting, in which the throttle is ''blipped'' (i.e. momentarily opened during downshifting) by the driver's heel during braking. Histo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unsynchronized Manual Transmission
A non-synchronous transmission, also called a crash gearbox, is a form of manual transmission based on gears that do not use Manual transmission#Synchronized transmission, synchronizing mechanisms. They require the driver to manually synchronize the transmission's input speed (engine RPM) and output speed (driveshaft speed). Non-synchronous transmissions are found primarily in various types of industrial machinery; such as tractors and Tractor unit, semi-tractors. Non-synchronous manual transmissions are also found on motorcycles, in the form of constant-mesh sequential manual transmissions. Prior to the 1950s and 1960s, most cars used constant-mesh (and also sliding-mesh) but non-synchronous transmissions. History Most early automobiles were rear-engined, using a single-speed transmission and belt-drive to power the rear wheels. In 1891, the French Panhard#Early_years, Panhard et Levassor automobile used a three-speed manual transmission and is considered to have set the te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
