Hydraulic Anti-Vibration Support And Method For Manufacturing It

Method of manufacturing a hydraulic anti-vibration support comprising first and second rigid frames interconnected by an elastomeric body which partially delimits an operating chamber filled with liquid, the second frame being fixed to a flexible elastomeric wall which partially delimits a compensation chamber communicating with the operating chamber via a restricted passage, the operating chamber and compensation chamber being separated from each other by a rigid partition fixed to the second frame, the second frame comprising first and second parts made from plastics material which are assembled to each other by welding and which are fixed, respectively, to the elastomeric body and to the flexible elastomeric wall,

• the first and second parts made from plastics material being in contact with each other in a welding area forming a symmetrical surface of revolution about a central axis,
• this method comprising a welding step, in which the first and second parts made from plastics material are welded together to form the second frame, thus sealing the operating chamber and the compensation chamber,
• and, during the welding step, the first and second parts made from plastics material are rotated with respect to each other about the central axis while the said first and second parts made from plastics material are pressed against each other in the said welding area, thus producing a friction weld.