Abstract
In this paper, vibration in wet friction systems with paper-based friction materials as seen in wet clutches in automatic transmissions was investigated theoretically and experimentally. The experiments were conducted under various conditions of lubricating oils, surface velocities and normal loads. It was shown that the vibration phenomena in this wet friction system depended greatly on the relationship of the friction force to the relative velocity characterizing lubricating oils. It was suggested that the vibration phenomena could be classified using the relationship of the relative velocity between the sliding surfaces to the surface velocity of one sliding surface.
