Wet friction systems applied, paper-based materials have been adapted to many machines such as automatic transmissions of passenger cars. We reported previously that the torsional vibration of the input shaft and in-plane, out-of-plane vibrations of separator plate occurred in a wet friction system made on an experimental basis. In this work, separator plate vibration in this wet friction system was studied in detail. We clarified that in-plane vibration of separator plate was observed as a free vibration with damping in a stick-slip motion of the input shaft. In the stick-slip motion process, at the moment that the state of input shaft changed from stick to slip, the in-plane vibration occurred and during the slip motion, this vibration damped. The effects of the normal load value and load support condition in the friction surface were investigated. From these results, it was suggested that separator plate vibration would occur in actual wet friction systems. We also considered the mechanism of these vibration occurrences.
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