1. Torque transmission :-
The clutch should be able to transmit the maximum torque of the engine under all conditions. It is usually designed to transmit 125 to 150% of the maximum engine torque. As the clutch slips during engagement, the clutch facing is heated. Clutch temperature is the major factor limiting the clutch capacity. This requires that the clutch facing must maintain a reasonable coefficient of friction with the mating services under all working conditions. Moreover the friction material should not Crush at high temperatures and clamping loads.
2. Gradual engagement :-
The clutch should positively take the drive gradually without the occurrence of sudden jerks.
3. Heat dissipation :-
During clutch application, large amount of heat are generated. The rubbing surfaces should have sufficient area and mass to absorb the heat generated. The proper design of the clutch should ensure proper ventilation or cooling for adequate dissipation of the heat.
4. Dynamic balancing :-
This is necessary particularly in the high speed clutches.
5. Vibration damping :-
Suitable mechanism should be incorporated within the clutch, to eliminate noise produced in the transmission.
6. Size :-
The size of the clutch must be smallest possible so that it should occupy minimum amount of space.
7. Inertia :-
The rotating parts should have minimum inertia. Otherwise, when the clutch is released for gear changing, the clutch plate will keep on spinning, causing hard shifting and gear clashing in spite of synchronizer.
8. Clutch free pedal play :-
To reduce effective clamping load on the carbon thrust bearing and wear thereof, sufficient clutch free pedal play must be provided in the clutch.
9. Ease of operation :-
For higher torque transmissions the operation of disengaging the clutch must not be tiresome to the driver.
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