What is the purpose of double clutching?

Answer 1

Double clutching is a shifting technique that would be required to match the engine speed with the speed of the input shaft in older gearboxes. Modern syncromesh gearboxes do not need this as this is accomplished automatically (first syncomeshes appeared in the 1920s and have been commonplace since at least the 1950s).

When up-shifting a non-synchronised gearbox, the clutch pedal is pressed, the throttle is released, and gearbox shifted into neutral. The clutch pedal is then released. As the engine idles with no load, the rpms will decrease until they are at a level suitable for shifting into the next gear. The clutch is depressed again and the up-shift completed. For a downshift, engine revs must be increased while the gearbox is in neutral and the clutch is engaged. This requires a shift into neutral, release of the clutch pedal and throttle application to bring the revs up to a suitable speed. The clutch is then put in and the shift completed. The whole process can be very quick and smooth, and was preferred by many racers into the 1970s even after syncomesh gearboxes were becoming standard in racing.

There's not much reason for doing this in the present day, though it is still mentioned by many (and often incorrectly in place of heel-toe downshifting, which is done to match revs on a downshift under braking, and is still needed for most performance oriented driving).

Answer 2

decrease than widely used situations, double-clutching isn't used to any extent further in racing - it is too sluggish to shift that way. the only exceptions to this rule is: a million) in case you will desire to shift right down to first kit (making use of an previous H-development gearbox) - first is annoying to work together at speed, and double-clutching makes the shift much less complicated and smoother, and 2) classic racing, the place the automobiles have not got synchromesh gears. You not often see double-clutching at the instant, as maximum race gearboxes are sequential shift - there isn't any independent between 2nd and usual to apply for the double-snatch.

Answer 3

I think due to double clutch to controle the throttle of air entering in cylinders & gearbox not to go in neutral & to shitted next gear.more see in this site.http://doubleclutch.ca/

Answer 4

To pull out of one gear and then go into the next, so as not to mess up the transmission.

Answer 5

PAUL, IS RIGHT ON THE SPEED OF THE ENGINE AND TRANSMISSION HAS TO MATCH ON AN UNSYCHRONIZED TRANSMISSION SUCH AS ON A BIG RIG!!