Hydraulic antivibration support

Claim 1

Antivibration device designed to be inserted for purposes of support and damping between two rigid elements, constituted by a fluid-tight box, interposed between the two rigid elements, said box comprising two rigid parts which can be made fast respectively with the two rigid elements, a first elastic wall connecting in fluid-tight manner one of the two rigid parts, to an annular armature, forming a portion of the other part, and ensuring the role of support between the two parts, a thin flexible wall borne in fluid-tight manner by the annular armature, a deformable partition also borne in fluid-tight manner by the annular armature, between the two said walls, and dividing the inside of the box into two chambers, namely an operating chamber comprised between the deformable partition and the first elastic wall and a compensating chamber comprised between the deformable partition and said thin flexible wall, said two chambers communicating with one another through a restricted passage, means for limiting to a small amplitude, that is to say less than 1 mm, the deformations of the partition in the axial direction perpendicular to its middle plane, and a liquid mass filling the two chambers, as well as the restricted passage, said device comprising a rigid ring borne by the annular armature, between the deformable partition and the first elastic wall, of which ring the inner edge dips into the operating chamber, and a foot extending from the first rigid part inwards of the operating chamber, said foot traversing with clearance, through a passage in the rigid ring and being terminated beyond said ring by an overlapping sole whose perpendicular cross-section relative to the foot is greater than the passage cross-section of the ring, thereby limiting deformation of the first elastic wall.