Hydraulic antivibration support

Supports – Resilient support – Nonmetallic resilient element

Patent

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Details

248636, 248638, 26714012, F16M 1300

Patent

active

058553525

DESCRIPTION:

BRIEF SUMMARY
The invention relates to hydraulic antivibration supports designed to be interposed for damping and connection purposes between two rigid elements such as the chassis and the engine of a vehicle, in order to damp vibratory motion between the two rigid elements, essentially along a main vibration direction.
More particularly, the invention relates to an antivibration support of this type, comprising first and second rigid strength members suitable for securing to respective ones of the two rigid elements to be united, and an elastomer body having a thick wall interconnecting the two rigid strength members and partially defining a working chamber, said thick wall being substantially bell-shaped, extending along the main vibration direction between a peripheral base secured to the second strength member and a crown secured to the first strength member, said elastomer body further including a freely-deformable thin wall which is integrally formed with the above-mentioned thick wall and which partially defines a compensation chamber that is in communication with the working chamber via a narrow channel, the two chambers and the narrow channel being filled with a liquid, the second strength member being a base plate which extends in a general plane that is substantially perpendicular to the main vibration direction and which has a "support" face secured in sealed manner with the elastomer body to co-operate therewith in defining the two chambers and the narrow channel.
Such a device is described in document EP-A-0 236 199, for example.
However, the device described in that document does not include a decoupling flap valve between the two rigid strength members for filtering small amplitude vibrations of relatively high frequency.
A particular object of the present invention is to provide a hydraulic antivibration support of the kind in question which has a decoupling flap valve, but which nevertheless is simple and relatively cheap.
To this end, according to the invention, a hydraulic antivibration support of the kind in question is essentially characterized in that its base plate is pierced by a hole in communication with the atmosphere and facing the working chamber, the hole being closed in sealed manner by a flexible membrane made of elastomer whose periphery is intimately bonded to the rim of the hole, the membrane being reinforced by a web made of non-deformable material that limits the displacement amplitude thereof.
In preferred embodiments of the invention, use is also made of one or more of the following dispositions: predetermined threshold by jamming; a membrane-receiving seat which is not entirely cylindrical; and the rim of the hole.
Other characteristics and advantages of the invention appear from the following description of several embodiments thereof, given by way of non-limiting example, and with reference to the accompanying drawings.
In the drawings:
FIG. 1 is a section view of an embodiment of the invention, the section being on line I--I of FIG. 2;
FIG. 2 is a section view on line II--II of FIG. 1;
FIG. 3 is a view from beneath of the device of FIGS. 1 and 2; and
FIGS. 4 and 5 show in similar manner to FIG. 2 but on a larger scale, two respective variants of a detail of said figure.
The antivibration support shown in FIGS. 1 to 3 comprise two rigid metal strength members 1 and 2 which are interconnected by an elastomer body 3.
The first strength member 1 is tubular in the example shown, having a longitudinal axis X. More generally, the first strength member 1 may be in the form of an elongate member that is solid or hollow, and of section that is circular or otherwise.
The second strength member 2 is a plate referred to below as a base plate, which is generally plane in shape, at least in part, and which extends parallel to the axis X of the first strength member.
The elastomer body 3 is secured to the first strength member 1 by vulcanization. It has a thick wall 4 that is substantially bell-shaped, extending from a crown secured to the first strength member 1 to a peripheral base secured

REFERENCES:
patent: 4262886 (1981-04-01), Le Salver et al.
patent: 4767106 (1988-08-01), Le Fol
patent: 5549283 (1996-08-01), Bellamy et al.
patent: 5556071 (1996-09-01), Bellamy et al.
patent: 5741001 (1998-04-01), Bellamy et al.
French Search Report dated 2 Jun. 1995, French Appl. No. FR 9412889.
International Search Report dated 21 Feb. 1996, International Appl. No. PCT/FR 95/01425.
Patent Abstract of Japan, vol. 12, Number 437 (M-765) (17 Nov. 1988), JP 63-172036 A, 15 Jul. 1988.
Patent Abstract of Japan, vol. 8, No. 140 (M-305) (29 Jun. 1984), JP 59-037348 A, 29 Feb. 1984.

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