Hutchinson

Jean-Luc Salaud

Daniel DuBos

Jean-Pierre Bretaudeau

Jean Thelamon

A hydraulic antivibratory sleeve is disclosed comprising two rigid tubular frames (1, 2), one surrounding the other, and joined together by an elastomer body (3) shaped so as to form therewith at least two diametrically opposite sealed pockets (A, B) communicating together through a narrow channel, the assembly of the pockets and said channel being filled with a damping liquid, the portion of the elastomer body which defines the first pocket (A) having in axial section the general form of a radially outwardly open U or V, the narrow channel being formed of at least two narrow channels (9) each extending, at least approximately and at least partially, along a transverse arc of a circle having as axis the axis of the external tubular frame (2), each arc being situated close to this frame and close to an axial end of said frame. The first pocket (A) is divided into two independent compartments (A.sub.1, A.sub.2) into which the two narrow channels (9) open respectively assigned respectively to the damping of different oscillation frequencies.

Hydraulic antivibratory sleeves

An improved hydraulic antivibratory device is disclosed intended to be inserted for damping and connection purposes between two rigid elements, comprising an annular frame (1) and a rigid hub (2), fixed respectively to the two rigid elements, a frustroconical elastomer spring (3) interposed between the frame and the hub, a flexible and sealed membrane (4) carried by the frame, a rigid intermediate wall (5) defining two chambers (A, B), a restricted passage (6) causing the two chambers to communicate permanently together and a liquid (L) contained in the two chambers and in the restricted passage. The hub comprises a shoe (11) which is too large to pass through a washer (8) of the frame and this shoe is connected to an annular zone of the intermediate dividing wall by a sealed bellows (12).

Hydraulic antivibratory devices

A hydraulic antivibratory support is disclosed for insertion between a vehicle chassis and engine. A protective cover (14) which covers the flexible membrane (7) of the supprot is formed by an integral portion of a rigid intermediate arm (13) adapted for connecting the frame (5) associated with the cover to the crankcase of the engine.

The invention relates to a damping and holding device having a rigid base (7), a rigid ring (9), a truncated cone shaped resilient wall (12) resisting axial compression and sealingly connecting the base to the ring, a flexible membrane (13) sealingly connected to the ring, a sealing dividing wall (14) connected to the ring between the truncated cone shaped wall and the membrane, a restricted passage (15) providing communication between the two sides of the dividing wall and a liquid mass (16) filling the case thus formed. The device further comprises a second truncated cone shaped resilient wall (17) resisting axial compression and oriented in a direction opposite that of the first one (12), the small bases of the two truncated cone shaped walls being juxtaposed axially and both secured to the base, and a rigid external framework (18) connecting the large base of the second rigid wall with the ring.

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Conflans Sainte Honorine, France

Jean-Luc Salaud