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Drive Shaft
Electronics Fuel Injection
Exhaust Gas Reciculation
Exhaust Pipe
Fuel Pump
Fuse
Gearbox
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Oilpump
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Piston
Rank and Pinion
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Rocketarm
Seat
Self Starter
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Speedmeter
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Air Filters
Alternator
Battery
Brake
Bumpers
CamShaft
Carburetor
Clutch
Connecting Rod
Crank Shaft
Cylindrical Head
Differential
Distrubutor
Door
Drive Shaft
Electronics Fuel Injection
Exhaust Gas Reciculation
Exhaust Pipe
Fuel Pump
Fuse
Gearbox
Headlights
Oilpump
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Piston
Rank and Pinion
Radiator
Rocketarm
Seat
Self Starter
Spark Plug
Speedmeter
Universal Join
Water Pump
 
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Clutch

A clutch is a mechanism in engine for transmitting rotation that is engaged and disengaged. Clutch is useful in auto parts that have two rotating shafts. In these devices, one shaft is typically driven by a motor or pulley, and the other shaft drives another device. The clutch connects the two shafts so that they can either be locked together and spin at the same speed (engaged), or be decoupled and spin at different speeds (disengaged). In a drill, for instance, one shaft is driven by a motor, and the other drives a drill chuck.

Single plate friction clutch

This type of clutch is used almost exclusively in automobiles and trucks and has three main parts:
1. Driving member
2. Operating member
Multiple plate friction clutch
This type of clutch has several driving members interleaved with several driven members. It is used in motorcycles and in some diesel locomotives with mechanical transmission.

Wet and dry

A 'wet clutch' is immersed in a cooling lubricating fluid, which also keeps the surfaces clean and gives smoother performance and longer life. Wet clutches, however, tend to lose some energy to the liquid. A 'dry clutch', as the name implies, is not bathed in fluid.

Vehicular

There are many different vehicle clutch designs but most are based on one or more friction discs, pressed tightly together or against a flywheel using springs. The friction material varies in composition depending on whether the clutch is dry or wet, and on other considerations. Clutches found in heavy duty applications such as trucks and competition cars use ceramic clutches that have a greatly increased friction coefficient, however these have a "grabby" action and are unsuitable auto parts for road cars. The spring pressure is released when the clutch pedal is depressed thus either pushing or pulling the diaphragm of the pressure plate, depending on type, and the friction plate is released and allowed to rotate freely.

When engaging the clutch, the engine speed may need to be increased from idle, using the manual throttle, so that the engine does not stall. However, raising the engine speed too high while engaging the clutch will cause excessive clutch plate wear. Engaging the clutch abruptly when the engine is turning at high speed causes a harsh, jerky start. This kind of start is necessary and desirable in drag racing and other competitions where speed is more of an issue than comfort.


Operation in automobiles

This plastic pilot shaft guide tool is used to align the clutch disk as the spring-loaded pressure plate is installed. The transmission's drive splines and pilot shaft have an identical shape. A number of such devices fit various makes and models of drivetrains.

These cogs have matching teeth, called dog teeth, which means that the rotation speeds of the two parts have a synchronizer, a device that uses frictional contact to bring the two parts to the same speed, and a locking mechanism called a blocker ring to prevent engagement of the teeth (full movement of the shift lever into gear) until the speeds are synchronized.

In all car the clutch is operated by the left-most pedal using hydraulics or a cable connection from the pedal to the clutch mechanism. Even though the clutch may physically be located very close to the pedal, such remote means of actuation (or a multi-jointed linkage) are necessary to eliminate the effect of slight engine movement, engine mountings being flexible by design. With a rigid mechanical linkage, smooth engagement would be near-impossible, because engine movement inevitably occurs as the drive is "taken up." No pressure on the pedal means that the clutch plates are engaged (driving), while pressing the pedal disengages the clutch plates, allowing the driver to shift gears or coast.
A manual transmission contains cogs for selecting gears.

Non-powertrain in automobiles

There are other clutches found in a car. For example, a belt-driven engine cooling fan may have a clutch that is heat-activated. The driving and driven elements are separated by a silicone-based fluid and a valve controlled by a bimetallic spring. As the temperature of the spring rises, it unwinds and opens the valve, allowing fluid past the valve which allows the fan to spin at about 60% to 90% of shaft speed depending on whether it a regular or heavy-duty clutch. There are also electronically engaged clutches that use magnetic force to lock the drive and driven shafts together.

Operation in motorcycles

On most motorcycles, the clutch is operated by the clutch lever, located on the left handlebar. No pressure on the lever means that the clutch plates are engaged (driving), while pulling the lever back towards the rider will disengage the clutch plates, allowing the rider to shift gears. Motorcycle clutches are usually made up of a stack of alternating plain steel and friction plates. The plates are forced together by a set of coil springs when the clutch is engaged. Racing motorcycles often use slipper clutches to eliminate the effects of engine braking.
 




 

 

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