Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1986-08-12
1988-04-26
Falk, Joseph
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
188320, 267 6427, F16M 700
Patent
active
047399783
DESCRIPTION:
BRIEF SUMMARY
The invention relates to antivibration devices designed to be inserted for the purposes of support and damping between two rigid elements, the damping involving the driving of a liquid through a throttled passage, and the relative movements to be damped of the two rigid elements comprising on the one hand oscillations of relatively large amplitude (that is to say greater than a mm.) at relatively low frequency (that is to say less than 20 Hz) and on the other hand vibrations of relatively low amplitude (that is to say less than 0.5 mm.) at relatively high frequency (that is to say higher than 20 Hz).
By way of non-limiting example, it is indicated that such supports can be mounted between a vehicle chassis and the engine of this vehicle, the relatively ample oscillations to be damped being those created by the irregularities and variations in slope of the ground during the travel of the vehicle over this ground and the vibrations to be damped being those due to the operation of the engine.
The invention relates more particularly, among supports of the type concerned, to those which are constitued by a fluid-tight housing interposed between the two rigid elements, said housing comprising two rigid parts firmly securable respectively with the two rigid elements, an annular elastic supporting wall joining one of the two rigid parts in fluid-tight manner to a rigid annular armature forming part of the second part, a flexible diaphragm borne in sealed manner by the annular armature, a deformable partition also borne in fluid-tight manner by the annular armature between the support wall and the flexible diaphragm and dividing the inside of the enclosure bounded by this wall and by this diaphragm into two chambers, namely a working chamber on the side of the wall and a compensation chamber on the side of the diaphragm, these two chambers communicating with each other through the above throttled passage, means for limiting to a low 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 throttled passage.
With such a support, a vibration of high frequency and of low amplitude exerted between the two rigid elements generates corresponding relative movements between the two rigid parts, which are transmitted to the deformable partition by the liquid contained in the working chamber and manifested by a rapid succession of alternate deformations of this partition perpendicular to itself, of amplitude less than the maximum possible value: the dimensions of the partition are selected to be sufficient so that the latter can thus absorb the movements indicated without the liquid being driven back through the throttled passage in opposite directions in synchronism with the vibration.
On the contrary, for oscillations of higher amplitude and of lower frequency, the amplitude of the corresponding deformations of the partition reaches its maximum possible value and the liquid is then driven back through the throttled passage, which ensures the hydraulic damping of this liquid through its putting into resonance in this passage, at least for certain values of said frequency connected with the dimensions with said passage.
The invention relates more particularly still, among supports of the type concerned, to those for which the throttled passage is a channel which defines a liquid mass assimilatable to a column of relatively large diameter and length, this channel being hollowed in the annular armature of the support and extending around a circular arc comprised between 45.degree. and 350.degree. around the deformable partition, the two ends of the channel being terminated by unions which open respectively into the two chambers.
In known embodiments of said supports, the channel concerned is unique so that the ratio R between its length and its diameter, a ratio generally comprised between 2 and 100, is determined once and for all.
Now experience shows that the resonance frequency F of the liqu
REFERENCES:
patent: 4618128 (1986-10-01), Hartel et al.
patent: 4657232 (1987-04-01), West
Falk Joseph
Hutchinson
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