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Clutch is a device which is used to transmit power from one shaft to another. It connects a shaft on which it is mounted to another shaft which is in motion. Clutches are generally used in automobile to transmit power from engine to the driving wheels.
In cars it transmits power from the flywheel connected to the engine shaft to the clutch shaft, and from clutch shaft it is transmitted to the rear wheels through gear shaft, propeller shaft and differential.
Requirements of a Good Clutch-
Gradual Engagement:
The clutches should be engaged gradually so that the sudden jerks produced must be avoided.
Size:
The size of the clutch should be so small, so that it can be fit into minimum space.
Torque Transmission:
The clutch should be so designed, so that it can able to transfer maximum power through it.
Heat Dissipation:
It should be so designed, so that maximum dissipation of heat takes place from it.
Dynamic Balancing:
For high speed clutches dynamic balancing is necessary.
Provision of Clutch Free Pedal:
There should be a clutch free pedal in engaging or disengaging of clutch.
Ease of Operation:
Engaging and disengaging of the clutch should not be difficult or tiresome to the operator.
Vibration Damping:
The clutch should be so designed, so that the noise or vibration produced in the transmission can be eliminated easily.
Types of clutches:
1. Cone clutch
2. Single plate clutch
3. Multi-plate cutch
4. Semi-centrifugal clutch
5. Centrifugal clutch
The main parts of a clutch are mainly divided into three groups-
1. Driving Members:
The driving members consists of a flywheel which is mounted on the engine crankshaft
The flywheel is bolted to a cover which carries pressure plate, pressure springs and releasing levers.
As the flywheel is bolted to the cover assembly, thus, the entire assembly of the flywheel and the cover rotate all the times.
The clutch housing and cover provided with openings so that the heat produced during the function dissipates easily.
2. Driven Members:
The driven members consists of a disc or plate called clutch plate.
The clutch is free to slide on the splines of the clutch shaft.
It carries friction materials on both of its surfaces.
When the clutch plate is gripped between the flywheel and the pressure plate, it rotates the clutch shaft through splines.
3. Operating Members:
The operating members consists of a foot pedal, linkage, release or throw out bearings.
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