Patent ID: 7635116

Claim:
A method of manufacturing an antivibration device for being interposed between first and second elements for damping and connection purposes, and antivibration device comprising a hydraulic element, itself comprising: first and second strength members adapted to be fastened respectively to the first and second elements, the second strength member being annular and centered on a central axis: an elastomer body interconnecting the first and second strength members, said elastomer body being substantially bell-shaped and extending along said central axis between a top secured to the first strength member and an annular base, said annular base being centered on said central axis and secured to the second strength member; and a leaktight hydraulic compartment filled with liquid, defined by the elastomer body and by a flexible closure wall fastened to the second strength member by at least one radial closure zone which is centered on said central axis, said hydraulic compartment comprising: firstly a working chamber filled with liquid and defined by the elastomer body; and secondly a compensation chamber filled with liquid, separated from the working chamber by a partition which is substantially perpendicular to the central axis and which is fixed to the annular base of the elastomer body, said compensation chamber communicating with the working chamber, said compensation chamber being defined at least in part by the closure wall, said working chamber being superposed to said compensation chamber along the central axis; the method presenting at least the following steps: an assembling step in which the elastomer body is assembled with the first and second strength members; a fastening step in which the closure wall is fastened to the second strength member and the partition is fastened to the base of the elastomer body; and then an overmolding step in which a rigid connection piece of plastics material is overmolded onto an exterior of the second strength member and covering the radial closure zone at least in part for reinforcing tightness of said leaktight compartment, said connection piece being adapted to connect said second strength members to said second element.