SE M I N A R DUAL-CLUTCH TRANSMISSION KUNAL LUTHRA 1111254908 8th Semester KUNAL LUTHRA (1111254908) They are usually operated in a fully automatic mode. It uses two separate clutches for odd and even gear sets. KUNAL LUTHRA (1111254908) .INTRODUCTION A Dual-Clutch Transmission. (DCT) is a type of semiautomatic transmission or semi-automated automotive transmission. It has no clutch pedal. and many also have the ability to allow the driver to manually shift gears in semi-automatic mode. it is described both as a 7-speed double-clutch transmission and as a 7-speed automatic transmission. Ford Ranger & Peugeot 205. Leamington Spa with prototypes built into the Ford Fiesta Mk1. the largest numbers of sales of DCTs in Western Europe are by various marquees of the German Volkswagen Group. It is actually a dualclutch semi-automatic.HISTORY It was invented by Frenchman Adolphe Kégresse just before World War II but he never developed a working model. All of these early AP Twin Clutch installations featured a single dry clutch and multi-plate wet clutch. BMW Canada's website for the 3 Series Coupe. As of 2009. KUNAL LUTHRA (1111254908) . The first development started in the early part of 1980 under the guidance of Harry Webster at Automotive Products (AP). In 2010. DCTs are able to shift more quickly than cars equipped with single-clutch automated-manual transmissions (AMTs).OVERVIEW In DCTs where the two clutches are arranged concentrically. Shifts can be accomplished without interrupting torque distribution to the driven road wheels.a.k. single-clutch semi-automatics. KUNAL LUTHRA (1111254908) . a. by applying the engine's torque to one clutch at the same time as it is being disconnected from the other clutch. while the smaller inner clutch drives the even numbered gears. the larger outer clutch drives the odd numbered gears. Click icon to add picture WORKING A two-part transmission shaft is at the heart of a DCT. KUNAL LUTHRA (1111254908) . Click icon to add picture WORKING KUNAL LUTHRA (1111254908) . hydraulic pressure inside the piston forces a set of coil springs part. The friction discs have internal teeth that are sized and shaped to mesh with splines on the clutch drum. To disengage the clutch. which pushes a series of stacked clutch plates and friction discs against a fixed pressure plate. which eases pressure on the clutch pack and pressure plate. KUNAL LUTHRA (1111254908) . In turn. the drum is connected to the gearset that will receive the transfer force. fluid pressure inside the piston is reduced.WORKING When the clutch is engaged. This allows the piston springs to relax. Click icon to add picture WORKING KUNAL LUTHRA (1111254908) . fuel efficiency increases dramatically. it affords drivers the luxury of choosing whether they prefer to control the shifting or let the computer do all of the work. Power flow from the engine to the transmission is not interrupted. It certainly offers smooth acceleration by eliminating the shift shock that accompanies gearshifts in manual transmissions and even some automatics. With upshifts taking a mere 8 milliseconds. KUNAL LUTHRA (1111254908) . many feel that the DCT offers the most dynamic acceleration of any vehicle on the market.ADVANTAGES It doesn't have is a clutch pedal. manufacturers are already investing heavily in alternate transmission technologies.DISADVANTAGES Automakers are wary of the additional costs associated with modifying production lines to accommodate a new type of transmission. In addition. KUNAL LUTHRA (1111254908) . THANK YOU. KUNAL LUTHRA (1111254908) .