There are a few simple ways to increase torque capacity in a clutch system.1) Add friction surfaces. Instead of just one disc, two or three disc clutches are sometimes used.
2) Increase the coefficient of friction of the friction material. The following materials are often used: organic (.25), carbon/kevlar (.28), kevlar (.36), ceramic (.38) and steel/feramic (.40). As the coefficient is increased clutch grab or chatter might occur.
3) The spring/diaphragm pressure is increased in the cover assembly (a.k.a. pressure plate). The clutch pedal effort will usually increase.
4) A larger mean radius (r) is used. This is also called the radius of gyration. This means generally a larger diameter disc, cover assembly (pressure plate), and flywheel but can sometimes mean that the inside radius of the lining is increased which would give a larger mean radius without changing the overall diameter.
r = mean effective radius of lining in feet [(inside radius + outside radius) ÷ 2]
Sometimes a combination of all four are used. For example, an Eaton (aka Spicer) clutch for a large 18 wheeler truck can have two discs that have ceramic button discs that are 15-1/2" in diameter with a 2,000 lb cover assembly clamp load.
Related Pages:
Calculating Clutch Torque Capacity
Clutch Torque Calculator
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