Vibration insulation damper for coil spring

A vibration insulation damper insertable into an internal circumferential portion of a coil spring and extending in an axial direction thereof, the vibration insulation damper comprising:

• an elastic body having an outer circumferential surface including at least one truncated conical or pyramid outer circumferential surface, with a portion of the at least one truncated conical or pyramid outer circumferential surface having a smallest cross-sectional shape at a first axial end of the elastic body;
• and
• a rib protruding outward from the outer circumferential surface of the elastic body to be brought into pressured contact with the internal circumferential portion of the coil spring when the elastic body is inserted into the internal circumferential portion of the coil spring,
• wherein the rib protrudes outward from the outer circumferential surface of the elastic body in a direction perpendicular to the axial direction of the elastic body, such that a distance which said rib protrudes from the outer circumferential surface increases towards the first axial end of said elastic body,
• wherein the outer circumferential surface of the elastic body comprises:
• a first extending portion having a first truncated conical or pyramid outer circumferential surface, with a portion of the first truncated conical or pyramid outer circumferential surface having a smallest cross-sectional shape at the first axial end of the elastic body;
• and
• a second extending portion having a second truncated conical or pyramid outer circumferential surface, with a portion of the second truncated conical or pyramid outer circumferential surface having a smallest cross-sectional shape at a second axial end of the elastic body, the second axial end of the elastic body being opposite to the first axial end of the body,
• wherein the second extending portion is integrally connected to the first extending portion via the central portion of the elastic body, and
• wherein a position of an end portion of the rib in a direction perpendicular to the axial direction of the elastic body is constant over an entire length of the elastic body in the axial direction.