Hutchinson

Jean-Paul Bouhours

Daniel DuBos

The invention relates to a hydraulic antivibratory device comprising a rigid core, a rigid circular base and an annular supporting elastic wall sealingly connecting the core to the base, the inner space of the box so formed being filled with liquid L and the core being extended inside the box, by a rigid foot itself terminated by a piston whose contour defines, with the opposite wall portion a throttled annular passage for the liquid. The base is perforated by at least one port whose length is very much less than the mean diameter and the base, external to the box is capped by a flexible and sealed bellows adapted to form with it a pocket of variable volume.

Hydraulic anti vibratory supports

A hydraulic antivibratory device is disclosed in which the restricted passage joining together the two chambers (A, B) comprises three portions (4, 5, 6) mounted in parallel, namely a first portion (4) whose flow section remains constant and two other portions (5, 6) whose flow sections are adjustable successively from a zero value to a maximum value by two rotary cams (9, 10) mounted on the same shift (11): the device thus provides good damping for oscillations whose frequencies increase (for example from 5 to 20 Hz) when the shaft is rotating.

Hydraulic antivibratory devices

In an antivibratory support interposed between two rigid elements (1-3 and 4-5) and comprising a work chamber (A) and a compensation chamber (B) separated by a dividing wall (8) with a mobile valve (10) and connected together by a restricted passage (9), a rotary cam (13) is provided immersed in the work chamber and serving as end of travel stop for the valve, the rotational movements of this cam being controllable from outside the support by means of a rod (14) passing sealingly through the dividing wall of the chamber. The cam is coupled to a a member (19) for controlling the opening of a second restricted passage (18).

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Arrou, France

Jean-Paul Bouhours