Transmitted torque through a diaphragm spring clutch for automotive driveline is traditionally expressed as a function of clamp load, friction coefficient, clutch geometry [1]. Actually, clutch torque depends on a number of operating parameterssuch as, e.g., frequency of engagement, dissipated energy, wear, slipping velocity. Some of those parameters affect thermal phenomena that happen inside the whole gearbox and particularly on clutch disc slipping surfaces.The paper presents a methodology adopted to investigate experimentally the relationships between clutch transmitted torque and clutch discs thermal phenomena depending on operating conditions. The final aim is to establish, through the relationshipsbetween transmitted torque and thermal phenomena, how transmitted torque depends on operating conditions. Experimental tests were managed employing a test bench carried out to evaluate automotive clutch dynamic performances.Some examples of obtained data are shown, while in the conclusions the possible hypotheses for the prosecution of the job are discussed, with a particular attention to the method to be adopted.
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