Switchable anti-vibration hydraulic mount and separation element

A partition member configured to be arranged between a working chamber and a compensating chamber of an anti-vibration hydraulic mount, the partition member comprising:

• a first channel configured to form a permanently open passageway between the working chamber and the compensating chamber,
• a second channel configured to form a passageway between the working chamber and the compensating chamber, the second channel comprising a central passageway extending in an axial direction, the central passageway being provided with a central opening,
• a receiving cavity open towards the working chamber and in fluid communication with the central passageway through the central opening, and
• a membrane fixed in the receiving cavity and separating the receiving cavity into two sub-spaces separated fluidically from each other, the membrane comprising a closing device protruding from the membrane towards the central opening and configured for an open configuration and a closed configuration,
• wherein the closing device is spaced apart from the central opening in the open configuration when the membrane is deformed towards the central passageway over a first distance,
• wherein the closing device is positioned against the central opening to close the central passageway in the closed configuration when the membrane is deformed towards the central passageway beyond the first distance,
• wherein the second channel comprises a tuning passageway in fluid communication with the central passageway and extends partially around the central passageway in a circumferential direction, the tuning passageway being open towards the compensating chamber,
• wherein the partition member comprises a circular adjusting plate provided with a tuning opening and configured to be placed in the tuning passageway in different orientations, and
• wherein the adjusting plate comprises a plurality of lugs projecting radially from the adjusting plate, and the lugs are distributed regularly around the circumference of the adjusting plate.