A jounce bumper of an automotive vehicle suspension system contains a longitudinal axis. The jounce bumper is configured to resiliently deform between an uncompressed state and a compressed state, where in the compressed state the jounce bumper has a smaller length in the direction of the longitudinal axis than in the uncompressed state. The jounce bumper also contains a base body that acts as a primary spring element, where the base body is partially or completely made of a volume-compressible first material. In particular, the base body further contains at least one secondary spring element integrated within the base body. The secondary spring element is resiliently deformable between a first length in the uncompressed state and a second length in the compressed state, where the second length is smaller than the first length. The secondary spring element is partially or completely made of a compact second material.

Gas spring end members include an end member wall with a longitudinal axis. End member wall includes an end wall portion and an outer wall portion. Outer wall portion extends peripherally about axis and is dimensioned to receivingly engage a flexible spring member. Rib wall portions are spaced around axis with each of rib wall portions projecting axially from end wall portion toward a rib end surface portion. Rib wall portions also include a rib edge surface portion spaced inward from an inner side surface portion of outer peripheral wall portion such that a gap is formed therebetween. Gas spring assemblies including one or more of such end members, and suspension systems including one or more of such gas spring assemblies are also included.

Gas spring end members include an end member wall with a longitudinal axis. The end member wall includes an end wall portion and an outer wall portion. The outer wall portion extends peripherally about an axis and is dimensioned to receivingly engage a flexible spring member. Rib wall portions are spaced around the axis with each of the rib wall portions projecting axially from the end wall portion toward a rib end surface portion. The rib wall portions also include a rib edge surface portion spaced inward from an inner side surface portion of the outer peripheral wall portion such that a gap is formed therebetween. Gas spring assemblies including one or more of such end members, and suspension systems including one or more of such gas spring assemblies are also included.

An air spring includes a composite bumper, a composite piston, a flexible bellow and an upper end cap member. The composite piston has a first end which includes a plurality of rigid portions and a plurality of adjacently positioned cantilever snap joints for receiving and securing the composite bumper. The composite bumper includes an inner wall having a surface shape for securely engaging the plurality of rigid portions and the plurality of cantilever snap joints. The first end of the composite piston further includes a piston housing surface upon which an outer surface of the composite bumper nests against. The flexible bellow is sealingly attached to the composite piston and the upper end cap member. The flexible bellow, the upper end cap member, and the composite piston together form a fluid tight chamber, and the composite bumper is contained within the fluid tight chamber.

An air spring includes a composite bumper, a composite piston, a flexible bellow and an upper end cap member. The composite piston has a first end which includes a plurality of rigid portions and a plurality of adjacently positioned cantilever snap joints for receiving and securing the composite bumper. The composite bumper includes an inner wall having a surface shape for securely engaging the plurality of rigid portions and the plurality of cantilever snap joints. The first end of the composite piston further includes a piston housing surface upon which an outer surface of the composite bumper nests against. The flexible bellow is sealingly attached to the composite piston and the upper end cap member. The flexible bellow, the upper end cap member, and the composite piston together form a fluid tight chamber, and the composite bumper is contained within the fluid tight chamber.

A coil spring includes a wire rod and an elastic coat provided on the wire rod. The coil spring includes a coil section including a plurality of coil portions. The wire rod includes a round cross-sectional portion, a cross-section varying portion, and a rectangular cross-sectional portion along the longitudinal direction of the wire rod. The cross section of the rectangular cross-sectional portion is substantially square and has a first plane and a second plane. The first plane and the second plane oppose each other in the coil section. The elastic coat is provided on at least one of the first plane and the second plane. The elastic coat is continuous from the round cross-sectional portion to the cross-sectional variation portion and the rectangular cross-sectional portion.

A jounce bumper of an automotive vehicle suspension system contains a longitudinal axis. The jounce bumper is configured to resiliently deform between an uncompressed state and a compressed state, where in the compressed state the jounce bumper has a smaller length in the direction of the longitudinal axis than in the uncompressed state. The jounce bumper also contains a base body that acts as a primary spring element, where the base body is partially or completely made of a volume-compressible first material. In particular, the base body further contains at least one secondary spring element integrated within the base body. The secondary spring element is resiliently deformable between a first length in the uncompressed state and a second length in the compressed state, where the second length is smaller than the first length. The secondary spring element is partially or completely made of a compact second material.