DUAL CLUTCH TRANSMISSION PRESENTED BY:- T.S.SRIVATS (1js06me045)

WHAT IS TRANSMISSION? Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work. The application of the engine power to the driving wheels is power transmission in case of automobiles.

PURPOSE OF TRANSMISSION IC engines need to operate at a relatively high rotational speed, which is inappropriate for starting, stopping, and slower travel. Instead you need to reduce the revolutions of the crank down to a usable value. This is known as gearing down which is done by the transmission setup.

WHAT IS A CLUTCH? Clutch is a device used in the transmission system of a motor vehicle to engage and disengage the engine to the transmission. In order for a car to stop without killing the engine, the wheels need to be disconnected from the engine this is done by a clutch. It enables the running engine to be connected to driving wheel smoothly and without shock. Clutch plate

WORKING OF CLUTCH When the clutch pedal is pressed, the throw-out bearing presses against the middle of the diaphragm spring. This in turn causes the spring to pull the clutch plate away from the flywheel. When your foot is off the pedal, the springs push the pressure plate against the clutch disc, which in turn presses against the flywheel.

INSIDE A CLUTCH CLUTCH PEDAL PRESSED CLUTCH PEDAL RELEASED

SINGLE CLUTCH TRANSMISSION In this kind of transmission there is only one clutch system and when the operator has to change a gear he needs to press the clutch pedal to operate the gear lever. From clutch

SINGLE CLUTCH TRANSMISSION When the Clutch is engaged the lay shaft with gears on them rotate. The helical gears is meshed with the gears on the output shaft, making the gears on the o/p shaft rotate. When the gear is selected the selector fork causes the dog gear to move left or right thus engaging the dog gear with the gear This gear transmits its energy through the dog gear to drive the output shaft.

DUAL CLUTCH TRANSMISSION Dual clutch transmission, it is two separate manual gearboxes contained within one housing, and working as one unit Sophisticated electronics and hydraulics control the clutches. One clutch controls the odd gears while the other controls the even gears

DCT ARRANGEMENT DCT has one lay shaft like a normal gearbox, but two output shafts. One output shaft has 1st, 3rd and 5th gears on it whilst the other has 2nd, 4th and 6th. The lay shaft is actually two shafts one inside the other connected to two concentric clutches at the end.

WORKING OF DCT

WORKING OF DCT

WORKING OF DCT

ADVANTAGES Better fuel economy up to 15% improvement than conventional transmission. No loss of torque transmission from the engine to the driving wheels during gear shifts Extremely fast up-shift time of 8 milliseconds Very smooth gear-shift operations.

DISADVANTAGES Relatively expensive to manufacture and therefore increases new vehicle purchase price Heavier than a conventional manual transmission Expensive transmission fluids/lubricants with dedicated additives are required, which need changing on a regular basis

DCT MT AUTO

APPLICATIONS DCT is used in Volkswagen cars as direct shift gearbox (DSG) Used in the Bugatti Veyron one of the fastest street legal cars in the world Used by Volvo in Europe for some of the public transport vehicles

CONCLUSION New environmental and fuel efficiency legislation have triggered new automated transmission technologies. The most likely winner that will replace traditional system will be the dual clutch transmission (DCT) as it offers the best of fuel efficiency as well as comfort and performance.

REFERENCES Carbibles.com Google.com howstuffwork.com wikipedia.com autoworld.com

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