Function Of Clutch In Car


An automobile has to operate under varying load conditions on the road. It may be noted that when starting engines and also during gear changes, it is necessary to cut off load upon the engine.
The “clutch” is a device to continue or discontinue load on the engine as necessary to solve these problems.

Position of clutch

The clutch is installed between the engine and transmission. It transmits the power of the engine generally through the use of fiction. The clutch is linked to the clutch pedal and the passenger compartment. When the driver presses down on the clutch pedal, the linkages causes the clutch to disengage. This increpes the engine from the transmission. When the driver releases the clutch pedal, springs in the clutch causes it to engage again. Now power can flow from the engine, through the clutch, to the transmission and power train.

Components of clutch

The main components of a clutch are engine flywheel, a friction (clutch) disc, and a pressure plate. The flywheel is connected to the engine crankshaft. When the engine is running, the flywheel is rotating. The pressure plate is atached to the flywheel and thus it also rotates. The friction disc, which is splined to transmission main shaft, is located between the two.

Working of clutch

When the clutch pedal is in the released condition (i.e. when the clutch is engaged), the pressure plate is pushed solidly in direction of the flywheel by the diaphragm spring, which is located inside the clutch cover. This action binds the friction disc between the two driving members. These three components the rotate as one, allowing the rotation of the engine to be transferred to the transmission as shown in figure above.

When the driver depresses the clutch pedal (to disengage the clutch), the motion of the pedal is transferred using either hydraulic pressure or a cable to the release fork. The release fork then moves the release bearing, pushing it against the centre of the diaphragm spring. This action forces the pressure plate to move away from the friction disc. There are now air gaps between the flywheel and the friction disc, and between the friction disc and the pressure plate. No power can be transmitted through the clutch.


Q. Which is not a friction clutch ?

Fluid clutch

Q. Which clutch is known as positive clutch ?

Dog clutch

Q. Which clutch is also known as a flywheel or coupling ?

Centrifugal clutch

Q. Clutch and friction linings are _ to the clutch plate


Q. Jaw clutch is a

Positive clutch

Q. Clutch used in scooter is

Multi plate clutch

Q. Clutch used in truck is

Single plate clutch

Q. In positive clutch, the slip is


Q. In Disc clutch, the clutch disc acts as a ?

Driven member

Name an automatic clutch which is controlled by engine speed ?

Centrifugal clutch

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