Dry friction clutches are a key element of today's manual transmission equipped cars. Their widely used methods of dimensioning are often based on experimental values e.g. those regarding the necessary slip safety factor. Also there are many simplifications used in the formulas describing the torque transmissibility. One of these is that a uniform pressure distribution is supposed to be acting between the friction linings and the cast iron parts of the clutch mechanism and those of the flywheel. This is not the case in most real situations, since frictional heat is forcing these parts to deform. In this paper the effects of thermoelastic deformations of the iron castings on the pressure distribution is discussed, and a measurement is proposed, so that this influence can be included into the formula describing the transmittable torque of a clutch.
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