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This article presents the latest developments of a research project aimed at studying the evolution of the transmissibility curve of dry clutches for automobile uses during the life of the component. In particular, the instruments developed for the experimental measurement of this characteristic are illustrated, separating the effects of thinning of the disc by wear from fatigue of the clutch pushplate mechanism. The instruments developed were used to collect a large quantity of experimental data which are presented and discussed.

The paper presents an experimental study to investigate the relationships among diaphragm spring clutch transmitted torque, thermal phenomena during clutch engagement and clutch wear. The work describes the development of a test bench presented by the Authors in a former paper. The original techniques were developed to measure the desired magnitudes and to develop the experimental methodology to investigate the relationships. The main results were obtained considering different operating conditions, dynamics of thermal phenomena and clutch wear.