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ByARUN SHARMA

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Common clutch-relatedcomponents are

:Flywheel mounts to the engine crankshaftClutch Disk the friction material assembly that provides easy engagement and firm torquetransferencePressure Platealso known as Clutch Cover this is the spring-loaded surface that locks the clutchThrow-out Bearingalso known as Release BearingPilot bearingcenters and supports the transmission input shaft (many cars do not have this bearing)Clutch Cable mechanical release mechanism for some vehicles

Clutch Master Cylinder force-multiplying cylinder for vehicles with hydraulic release mechanismsClutch Slave Cylinder used along with a Master Cylinder for hydraulic release mechanismsMisc. hoses, lines, brackets, linkages, etc. varies from vehicle to vehicleThe flywheel is a large steel or aluminum disc. It acts as a balance weight for the engine, dampeningengine vibrations caused by the firing of each cylinder and provides a surface that the clutch cancontact. The flywheel also has teeth around its circumference for the starter motor to engage andcrank the engine.The clutch disc is a steel plate, covered with a frictional material that is sandwiched between theflywheel and the pressure plate. The center of the disc is the hub, which fits the spines of the

transmission input shaft. When the clutch is engaged, the disc is "squeezed" between the flywheel andpressure plate, and power from the engine is transmitted by the disc's hub to the input shaft of thetransmission.A pressure plate is a metal spring-loaded friction surface that is bolted to the flywheel. It has a metalcover, heavy release springs, a metal pressure surface, and a thrust ring or fingers for the releasebearing. The thrust ring or fingers release the clamping force of the springs when the clutch isdisengaged.When the clutch pedal is depressed, the "Throw-out bearing" pushes the pressure plate's releasefingers. The pressure plate pulls away from the clutch disc, disengaging the clutch, thus interrupting

Clutches

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Multiple plate friction clutch

This type of clutch has several drivingmembers interleaved with several driven

,motorcyclesmembers. It is used in

dieselautomatic transmissions and in somewith mechanical transmission. Itlocomotives

is also used in some electronically controlled

all-wheel drive systems. It is the mostcommon type of clutch on modern types ofvehicles.

http://en.wikipedia.org/wiki/Motorcyclehttp://en.wikipedia.org/wiki/Diesel_locomotivehttp://en.wikipedia.org/wiki/Diesel_locomotivehttp://en.wikipedia.org/wiki/Diesel_locomotivehttp://en.wikipedia.org/wiki/Diesel_locomotivehttp://en.wikipedia.org/wiki/Motorcycle

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Vehicular There are different designs of vehicle clutch, but most

are based on one or more friction discs, pressed tightlytogether or against a flywheel using springs. The frictionmaterial varies in composition depending on whether theclutch is dry or wet, and on other considerations. Friction

discs once contained asbestos, but this has been largelyeliminated. Clutches found in heavy duty applicationssuch as trucks and competition cars use ceramicclutches that have a greatly increased friction coefficient.However, these have a "grabby" action and are

unsuitable for road cars. The spring pressure is releasedwhen the clutch pedal is depressed thus either pushingor pulling the diaphragm of the pressure plate,depending on type, and the friction plate is released andallowed to rotate freely.

http://en.wikipedia.org/wiki/Frictionhttp://en.wikipedia.org/wiki/Flywheelhttp://en.wikipedia.org/wiki/Spring_%28device%29http://en.wikipedia.org/wiki/Asbestoshttp://en.wikipedia.org/wiki/Pressurehttp://en.wikipedia.org/wiki/Pressurehttp://en.wikipedia.org/wiki/Asbestoshttp://en.wikipedia.org/wiki/Spring_%28device%29http://en.wikipedia.org/wiki/Flywheelhttp://en.wikipedia.org/wiki/Friction

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When engaging the clutch, the enginespeed may need to be increased from

idle, using the manual throttle, so thatthe engine does not stall (although insome cars, especially diesels, there is

enough torque at idling speed that thecar can move; this requires finecontrol of the

http://en.wikipedia.org/wiki/Throttlehttp://en.wikipedia.org/wiki/Throttle

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