Patent ID: 7077461

Claim:
A sound insulation device for mounting in a tubular part, in particular a motor vehicle bodywork part, the device comprising a partitioning insert, a cord of a composition that is thermally expandable so as to form a foam, said cord being fitted to the periphery of the insert, retaining means for holding the cord on the insert prior to expansion of the cord, and means for encouraging the cord to expand towards the inside wall of the tubular part, the cord being formed by being extruded in rectilinear manner without any particular shaping, and the cord retaining means being integrally molded with the partitioning insert and also serving to shape the extruded cord around the periphery of the partitioning insert, wherein the expandable cord presents a variable swelling ratio which is selected as a function of the space to be filled between the insert and the inside wall of the tubular part, wherein the swelling ratio of the expandable cord is about 1000% to 1400%, and wherein the diameter of the cord is about 5 mm to 7 mm.