Patent ID: 8240644

Claim:
A hydraulic anti-vibration mount designed to be interposed for damping purposes between first and second rigid components, the anti-vibration mount comprising: first and second support members arranged for being fixed to the two rigid components, a first structural plate rigid with the second support member, an elastomer body connecting the two support members to each other and delimiting, with the first structural plate, a liquid-filled working chamber, a first liquid-filled restricted passage that has a first resonance frequency, and that links the working chamber to an intermediate chamber, a second structural plate rigid with the second support member and comprising a main port, a flexible bellows that delimits with said second structural plate a liquid-filled compensation chamber, a second liquid-filled restricted passage having a second resonance frequency, wherein the second restricted passage connects either the compensation chamber to the intermediate chamber or the compensation chamber to the working chamber, and wherein the hydraulic anti-vibration mount also comprises a flexible membrane delimiting with the first structural plate an auxiliary chamber, said flexible membrane hermetically separating the auxiliary chamber from the intermediate chamber, and the flexible membrane being arranged for deforming to close the main port, wherein the flexible membrane comprises a fixed peripheral area, and wherein the auxiliary chamber is supplied from the working chamber by a first flow path equipped with a check valve, arranged for only allowing a flow of liquid from the working chamber to the auxiliary chamber, and the auxiliary chamber can empty into the compensation chamber by a second flow path.