Jounce bumper plate

A jounce bumper plate for a damping module of a type commonly employed automotive suspension system having a hydraulic cylinder with an upper end cover, a piston rod slidably extending from the upper end of the cylinder and ajounce bumper mounted upon the piston rod. The jounce bumper plate mounted on an upper end of the cylinder and includes a central bore therethrough to allow slidable passage of the piston rod, and includes a series of arches extending about the outer periphery of the plate. The arches increase in curvature from the central bore to the outer periphery, thereby forming gaps between the jounce bumper plate and the associated hydraulic cylinder to facilitate the expulsion of moisture and contaminants from the upper end of the hydraulic cylinder during compression and extension cycles of the associated cylinder.