408 ディスクブレーキパッドの動剛性に及ぼすディスク・パッド間のすべりの影響

概要

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Magnitude and pressure dependency of dynamic stiffness of disk brake pad influence squeal frequency, sound pressure level and squeal generation. The past researches clarified that dynamic stiffness is affected by surface textures. The smoother the surface texture of pad is, the larger dynamic stiffness is. However, frictional contact interface between disk and pad has been sticking at past dynamic stiffness measurement. Slipping between disk and pad affect pad texture. In this study, relation between dynamic stiffness and slipping at contact frictional interface is measured. We made apparatus for dynamic stiffness measuring at slipping between disk and pad. At slipping, dynamic stiffness is decreased. As the slip velocity is large, dynamic stiffness is decrease. If pad stiffness assume series coupling of surface stiffness and base material stiffness, decrease of dynamic stiffness can express that surface stiffness decrease at slipping. In designing squeal-less brake pad, slipping between disk and pad should be considered.
2011-09-05