Hydraulic antivibratory support for engine with device for adjusting nozzle cross-section

Claim 1

An antivibratory device which is interposed between two rigid elements for support and damping comprising: a sealed case interposed between the two rigid elements, said sealed case including (a) a rigid base fixable to one of the rigid elements, (b) a rigid ring fixable to the other rigid element, (c) a resilient annular support wall offering good resistance to compression between the two rigid elements and sealingly connecting said rigid ring to said rigid base, (d) a flexible membrane sealingly connected to said rigid ring, and (e) a separation wall dividing an inside of said case into two chambers, a work chamber situated between said resilient annular support wall and said separation wall and a compensation chamber situated between said flexible membrane and said separation wall; a nozzle through which said work chamber and said compensation chamber communicate, said nozzle including a deformable wall whereby a cross section of said nozzle can be modified; a liquid which fills said work chamber, said compensation chamber, and said nozzle; and an adjusting means for adjusting the cross section of said nozzle by deforming said deformable wall even during the operation of said antivibratory device, said adjustment means includes a rigid tie rod which directly connects a part of said deformable wall with a control member external to said case.