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A clutch is a mechanism for transmittingrotation, which can be engaged anddisengaged. Clutches are useful in devices that

have two rotating shafts. In these devices, oneshaft is typically driven by motor or pulley,and other shaft drives another device.

The clutch connects the two shafts so that they

can either be locked together and spin at thesame speed (engaged), or be decoupled andspin at different speeds (disengaged).

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The clutch disc (centre) spins with the flywheel (left). To

disengage, the lever is pulled (black arrow), causing a white

pressure plate (right) to disengage the green clutch disc fromturning the drive shaft, which turns within the thrust-bearingring of the lever. Never will all 3 rings connect, with any

gaps.

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It permit engine to run freely.

Shifting of transmission into various gears.

Provides a smooth engagement which lessen

the shock on gear shaft and other driving parts.

When engaged, it transmit the power

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Dog clutch

Wet and dry

Cone clutch

Centrifugal clutch Torque limiter clutch

Electro-magneticclutch

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Electromagneticclutches operateelectrically, but

transmit torquemechanically. This iswhy they used to bereferred to as electro-mechanical clutches.

http://en.wikipedia.org/wiki/Torquehttp://en.wikipedia.org/wiki/Torque

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In a clutch, the electromagnetic lines of flux have to pass into the rotor, and in turn,

attract and pull the armature in contact with it to complete clutch engagement. Most

industrial clutches use what is called a single flux, two pole design. Mobile clutches of

other specialty electromagnetic clutches can use a double or triple flux rotor. The double

or trip flux refers to the number of north/south flux paths, in the rotor and armature.

This means that, if the armature is designed properly and has similar banana slots,what occurs is a leaping of the flux path, which goes north south, north south. Byhaving more points of contact, the torque can be greatly increased. In theory, ifthere were 2 sets of poles at the same diameter, the torque would double in a clutch.

Obviously, that is not possible to do, so the points of contact have to be at a smallerinner diameter. Also, there are magnetic flux losses because of the bridges betweenthe banana slots. But by using a double flux design, a 30%-50% increase in torque,can be achieved, and by using a triple flux design, a 40%-90% in torque can beachieved. This is important in applications where size and weight are critical, suchas automotive requirements

The coil shell is made with carbon steel that has a combination of good strength and good

magnetic properties. Copper (sometimes aluminium) magnet wire, is used to create the

coil, which is held in shell either by a bobbin or by some type of epoxy/adhesive.

http://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Aluminumhttp://en.wikipedia.org/wiki/Magnet_wirehttp://en.wikipedia.org/wiki/Bobbinhttp://en.wikipedia.org/wiki/Bobbinhttp://en.wikipedia.org/wiki/Magnet_wirehttp://en.wikipedia.org/wiki/Magnet_wirehttp://en.wikipedia.org/wiki/Magnet_wirehttp://en.wikipedia.org/wiki/Aluminumhttp://en.wikipedia.org/wiki/Copper

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Flywheel mounts to the engine crankshaftalso known as Release Bearing

Pilot bearing centers and supports the

transmission input shaft (many cars do nothave this bearing)

Clutch Cable mechanical release mechanismfor some vehicles

Clutch Master Cylinder force-multiplyingcylinder for vehicles with hydraulic releasemechanisms

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Clutch Slave Cylinder used along with a MasterCylinder for hydraulic releasemechanisms

The flywheel is a large steel or aluminum disc. Itacts 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 itscircumference for the starter motor to engage andcrank the engine.

Misc. hoses, lines, brackets, linkages, etc. variesfrom vehicle to vehicle

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The clutch disc is a steel plate, covered with africtional material that is sandwiched betweenthe flywheel and the pressure plate. The center of

the disc is the hub, which fits the spines of thetransmission input shaft. When the clutch isengaged , the disc is "squeezed between theflywheel and pressure plate, and power from theengine is transmitted by the disc's hub to the input

shaft of the transmission.

A pressure plate is a metal spring-loadedfriction surface that is bolted to the flywheel. Ithas a metal cover, heavy release springs, a metalpressure surface, and a thrust ring or fingers forthe release bearing. The thrust ring or fingersrelease the clamping force of the springs when theclutch is disengaged.

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