Abstract
It is important to grasp the dynamic frictional characteristics of facing materials and their methods of use in order to predict self-excited vibration in multiple-plate clutches used in transmissions. A dedicated torque transmission characteristic test apparatus capable of equalizing the surface pressure was built to deal with the dynamic frictional characteristics of the facing materials, which are affected by the temperature and contact pressure of the friction surfaces. With this apparatus, the sliding velocity dependence was determined for each temperature and surface pressure. A simulation model was constructed for dynamic behavior analysis of the characteristics of torque transmission to the vehicle body from a transmission that incorporates an FEM model of the clutch for the purpose of gaining a quantitative grasp of the dynamic frictional characteristics and methods of use of the facing materials obtained in this way. Simulation was used to examine the construction of a clutch that suppresses self-excited vibration in order to confirm the usefulness of this method, and the reduction of vibration in an actual vehicle was confirmed.
KEYWORDS – Self-excited vibration, Transient phenomenon, Dynamic frictional characteristics, μ slope, Multiple-plate wet clutches