DUAL CLUTCH DUAL CLUTCH TRANSMISSION SYSTEMTRANSMISSION SYSTEM

SEMINAR BY : MOHAMMED SEMINAR BY : MOHAMMED SUHAILSUHAILGUIDED BY : MR. SYED GUIDED BY : MR. SYED RAZEEQULLARAZEEQULLA

ASST. PROFESSORASST. PROFESSOR MECHANICAL DEPT.MECHANICAL DEPT. MITE, MOODBIDRI.MITE, MOODBIDRI.

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CONTENTS:

1. INTRODUCTION2. PURPOSE OF TRANSMISSION 3. WORKING OF SINGLE CLUTCH4. DUAL CLUTCH TRANSMISSION (DCT)5. WORKING OF DCT6. ADVANTAGES7. DISADVANTAGES8. APPLICATION9. CONCLUSION10. REFERENCES 204/28/23

WHAT IS TRANSMISSION?WHAT IS TRANSMISSION?

Power transmission is the movement Power transmission is the movement of energy from its place of of energy from its place of generation to a location where it is generation to a location where it is applied to performing useful work.applied to performing useful work.

The application of the engine power The application of the engine power

to the driving wheels is power to the driving wheels is power transmission in case of automobiles.transmission in case of automobiles.

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PURPOSE OF PURPOSE OF TRANSMISSIONTRANSMISSION

IC engines need to operate at a relatively IC engines need to operate at a relatively high rotational speed, which is high rotational speed, which is inappropriate for starting, stopping, and inappropriate for starting, stopping, and slower travel. slower travel.

Instead you need to reduce the Instead you need to reduce the revolutions of the crank down to a usable revolutions of the crank down to a usable value. This is known as value. This is known as gearing down which is done by the transmission setup.

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WHAT IS A CLUTCH?WHAT IS A CLUTCH? Clutch is a device used in the Clutch is a device used in the

transmission system of a motor vehicle to transmission system of a motor vehicle to engage and disengage the engine to the engage and disengage the engine to the transmission.transmission.

In order for a car to stop without In order for a car to stop without damaging the engine, the transmission of damaging the engine, the transmission of power from the engine to the wheels power from the engine to the wheels need to be disconnected. This is done need to be disconnected. This is done by a clutch.by a clutch.

It enables the running engine to be It enables the running engine to be connected to driving wheel smoothly and connected to driving wheel smoothly and without shock. without shock.

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CLUTCH PLATECLUTCH PLATE

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CLUTCH PEDAL PRESSED CLUTCH PEDAL RELEASED

INSIDE A CLUTCHINSIDE A CLUTCH

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WORKING OF CLUTCHWORKING OF CLUTCH When the clutch pedal is pressed, the When the clutch pedal is pressed, the

throw-out bearing presses against the throw-out bearing presses against the middle of the diaphragm spring. This in middle of the diaphragm spring. This in turn causes the spring to pull the turn causes the spring to pull the pressure plate away from the clutch.pressure plate away from the clutch.

When your foot is off the pedal, the When your foot is off the pedal, the springs push the pressure plate against springs push the pressure plate against the clutch disc, which in turn presses the clutch disc, which in turn presses against the flywheel. against the flywheel.

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SINGLE CLUTCH SINGLE CLUTCH TRANSMISSIONTRANSMISSION

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

From clutch

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ARRANGEMENT OF ARRANGEMENT OF SINGLE CLUTCH SINGLE CLUTCH TRANSMISSIONTRANSMISSION

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DUAL CLUTCH DUAL CLUTCH TRANSMISSIONTRANSMISSION

Dual clutch transmission, it is two Dual clutch transmission, it is two separate manual gearboxes contained separate manual gearboxes contained within one housing, and working as within one housing, and working as one unitone unit

Sophisticated electronics and hydraulic Sophisticated electronics and hydraulic components control the clutches. One components control the clutches. One clutch controls the odd gears while the clutch controls the odd gears while the other controls the even gearsother controls the even gears

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DCT ARRANGEMENTDCT ARRANGEMENT DCT has one lay shaft like a normal DCT has one lay shaft like a normal

gearbox, but two output shafts. One output gearbox, but two output shafts. One output shaft has 1st, 3rd and 5th gears on it whilst shaft has 1st, 3rd and 5th gears on it whilst the other has 2nd, 4th and 6th. the other has 2nd, 4th and 6th.

The lay shaft is actually two shafts one The lay shaft is actually two shafts one inside the other connected to two inside the other connected to two concentric clutches at the end. concentric clutches at the end.

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DCT ARRANGEMENTDCT ARRANGEMENT

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WORKINGWORKING

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WORKING OF DCTWORKING OF DCT In DCT there are 2 clutches and 2 pressure In DCT there are 2 clutches and 2 pressure

plates. One clutch controls the odd gears plates. One clutch controls the odd gears and the other clutch controls the even gears.and the other clutch controls the even gears.

During the engaging of the first gear, the During the engaging of the first gear, the pressure plate gets engaged to the clutch pressure plate gets engaged to the clutch which is responsible for the controlling the which is responsible for the controlling the odd gears and the 1odd gears and the 1stst gear is engaged. gear is engaged.

When the 2When the 2ndnd gear is engaged the 1 gear is engaged the 1stst pressure plate is released and the 2pressure plate is released and the 2ndnd pressure plate gets engaged to the 2pressure plate gets engaged to the 2ndnd the the clutch which is responsible for controlling clutch which is responsible for controlling the even gear.the even gear.

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WORKING OF DCTWORKING OF DCT

The releasing of one pressure plate The releasing of one pressure plate and engaging of other pressure plate and engaging of other pressure plate takes place simultaneously.takes place simultaneously.

Similarly the engaging of other gears Similarly the engaging of other gears takes place and power is transmitted takes place and power is transmitted to the differential.to the differential.

For reverse gear an idle gear is used.For reverse gear an idle gear is used.1604/28/23

ADVANTAGESADVANTAGES Better fuel economy up to 15% improvement Better fuel economy up to 15% improvement

than conventional transmission.than conventional transmission.

Loss of torque transmission from the engine Loss of torque transmission from the engine to the driving wheels during gear shifts is to the driving wheels during gear shifts is reduced.reduced.

Extremely fast up-shift time of 8 milliseconds.

Very smooth gear-shift operations.

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DISADVANTAGESDISADVANTAGES Relatively expensive to manufacture

and therefore increases vehicle purchase price

Heavier than a conventional manual transmission

Expensive transmission fluids/lubricants

with additives are required, which needs changing on a regular basis

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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

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CONCLUSIONCONCLUSION New environmental and fuel New environmental and fuel

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

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REFERENCES www.Carbibles.com www.howstuffwork.com/dual clutch

transmission system www.wikipedia.com/ dual clutch

transmission system Auto.howstuffworks.com/clutch.htm Automobile engineering by R.B

Gupta

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