FR2472116A1 - ELASTIC BEARING - Google Patents

Abstract

ELASTIC BEARING INCLUDING SPRING ELEMENTS IN RUBBER OR PLASTIC SIMILAR TO RUBBER LODGED BETWEEN RIGID CONNECTION PARTS AND IN ADHESION BONDED THEREOF, AND A CUSHIONING DEVICE MADE IN THE FORM OF A PARVITE CAVITY EXTERNAL CONNECTION PART AND THE SPRING ELEMENTS, AT LEAST PARTLY FILLED WITH A LIQUID OR A DAMPING MASS AND OPEN THROUGH OVERFLOW HOLES OF AN INTERNAL CONNECTION PART, AND A FLEXIBLE MEMBRANE, COVERING THIS CAVITY, AND DEFORMABLE UNDER THE EFFECT OF THE PRESSURE OF THE DAMPING FLUID. THIS BEARING IS REMARKABLE IN THAT THE MEMBRANE 30, 31, 50, ON ITS SIDE OPPOSED TO THE CUSHIONING LIQUID, IS ASSOCIATED WITH A RIGID STOP PLATE 3, 4, 51, 52 WITH PERFORATIONS 23, 24, 53, 54 WHICH, IN THE DEFORMED STATE OF THE MEMBRANE, ARE TIGHTLY CLOSED BY THE MEMBRANE. SPECIAL APPLICATION TO THE MOUNTING OF CONTROL ENGINES IN MOTOR VEHICLES.

Description

The present invention relates to elastic bearings

  particularly for control motors installed in motor vehicles, comprising rubber or rubber-like plastic spring elements housed between, and in bonded connection with, rigid connecting pieces, and a device depreciation realized in the form of a

  cavity delimited by an external connecting piece

  re and the spring elements, at least partly filled with a liquid or a damping mass and open

  through overflow holes in a piece of

  inner cord, and a flexible membrane, covering this cavity, and deformable under the effect of pressure

damping liquid.

  Engine bearings of this kind, which are often

  also achieved in a doubly symmetrical form.

  with two sets of spring elements arranged opposite one another between two connecting pieces

  are known, for example, by the model of

  German nationality 7 616 276. The membranes are, in this

  exposed on one of their sides in the middle of

  usually water or other liquid with an additional anti-freeze agent and, on the other hand, an air mattress. Regarding the elastic suspension and damping of oscillations

  low frequency with relatively large amplitudes

  of, the known bearing constructions have generally been well proven. However, it has been found that with respect to high frequency oscillations, even with relatively small amplitudes, they harden to an undesirable extent; in fact, in this case, the strong throttling effect of the overflow bores provided for the damping liquid has the consequence that the air mattresses of the set of rubber springs are connected in parallel and thus have an adverse effect on the behavior from the spring suspension point of view

  of the bearing system in this limited area. By con-

  the object of the invention is to eliminate the influence, on the spring suspension behavior of elastic motor bearings, of damping in

  the domain of low amplitudes of oscillation

  normal driving behavior of a vehicle and to maintain practically

  desired spring without the phenomena of hardening other-

unavoidable.

  According to the invention, in elastic bearings of the type defined at the beginning of this preamble, a rigid abutment plate having perforations, which are

  hermetically sealed by the membrane in the de-

  formed of it, is associated with the membrane on its

  opposite to the damping medium. A connecting piece

  in any case, can then

  serve as a stop plate. It is possible, in the

  of the invention, in the case of producing the

  in practice, in the form of an element of

  two sets of rubber springs arranged opposite one another between two pieces of

  external connections, to associate a diaphragm with

  one of these two external connection pieces. At each half-oscillation of a given direction, a pressure is then exerted on the damping liquid and, by

  After that, we avoid the appearance of a depression with

  foam under the effect of steam or void detrimental to the spring effect. In the case of the double realization of the bearing, it is also possible, according to a variant of the invention, to provide only one membrane, dispose it centrally between the two sets of rubber springs and associate a plate of rigid abutment on

each of its two sides.

  The invention ensures, with extraordinary means,

  simple, inversely proportional damping amplitude, which does not have the drawbacks of known devices operating with drafts or

  of liquid (compression of the air in front of the nozzles of

  Narrow mortising and resulting hardening, formation

  of vacuum above liquids during the relaxation of

  spells, generation of oscillations and additional noises by special floating valves, and the like). As the membrane exposed on one side to the damping middle,

  contrary to what happens in

  known, does not bear against an air mattress but, thanks to the perforations provided in the plate of

  associated abutment, can deform freely and give way

  tially unhindered pressure drop occurs.

  until it comes into abutment with the rigid plate,

  the damping effect in the range of critical amplitudes

  that it was first abolished and, consequently, the whole

  The spring system does not undergo any disturbing curing. The amplitude of oscillation thus covered depends on the distance between the membrane in the relaxed state

  and the stop plate and can, therefore, be adjusted

  in advance in a very precise manner, for example in a

  range of an order of magnitude of one or a few millimeters

  very. Only when the predetermined amplitude

  this adjustment is exceeded and that the membrane

  on its entire surface, the thrust plate

  then establishes itself and then participates in the suspension

  bearing tick. The elasticity of the membranes makes the tran-

  sition at larger amplitudes damped smoothly

  and does not give rise to the appearance of any disturbing noise.

  Given the strong tensions generated locally during

  the application of membranes against

  perforated, it is recommended to equip the membranes

  reinforcement of textile reinforcement.

  The invention is not limited exclusively to the elastic bearings of the control units installed in motor vehicles, but it is also advantageously usable in other fields of the invention.

  technique of damping oscillations and

  in stages, for example for the installation of the

  bearing, for example for the installation of groups of machines and engines of any fixed type,

and for similar purposes.

  The invention will be better understood when reading

  the following detailed description and examination of the

  together, as non-standard examples

  two forms of execution.

  In these drawings: FIG. 1 is a folded axial sectional view of a two-diaphragm double symmetrical construction engine bearing, and FIG. 2 is a folded axial sectional view of an engine bearing of the same construction, comprising

  only a single membrane with a central layout.

  The bearing shown in FIG. 1 comprises two external metal connecting pieces in the form of

  pot or bell, 3, 4 which, turned one towards the other

  their respective openings are maintained as

  between them at a fixed distance from one of the

  be by means of spacer sleeves 5 and connecting rods

  9, 7, against two pieces of metal, and are resiliently supported by means of hollow frustoconical rubber spring elements 6, 7.

  internal connections 8, 9, with the same geo-

  metric than they are smaller. The parts of

  inner rope 8, 9 rest directly one

  against each other by their edges and form a consis-

  coherent truction, which in turn is fixed by

  intermediate side extensions 18, 19 and a support arm 20 in the manner of a stirrup, on the chassis, not shown, a motor vehicle. The control motor which, for the sake of clarity, is not represented either, is supported on the upper external connection piece 3 and, to ensure cohesion,

  this connecting piece is provided with a connecting bolt

  10. The rubber spring elements 6, 7 are vulcanized together in adhesive connection with the metal connecting pieces 3, 4 and 8, 9. Their elastic forces in the three different directions of oscillation can be influenced in the desired by the choice of their configuration, the adjustment of the

  rubber mixture and the appropriate layout of

  videments. The construction, installation and mode of operation of such engine bearings are known in

  themselves and therefore the

  presentation of other details that are not part of

  the invention and detailed descriptions corresponding to

pendent.

  Cavities 13, 14, formed between the inner side

  external connection parts 3, 4 and the

  hollowed bowl-shaped surface of the elements of

  fate 6, 7, are filled with a linear amortization

  quide or plastic which, during the movements of

  spring elements can escape, through relatively narrow, constantly open overflow bores 28, 29 of the inner connecting pieces 8, 9,

  the discharge compartment 11, formed therebetween.

  At a short distance, for example an order of magnitude

  1 mm, from the inner surface of the connecting pieces

  outer layers, flexible rubber membranes 30, 31, reinforced by textile reinforcements, cover

each one of the cavities 13, 14.

  In the relaxed state of rest represented, the members

  branes are found, over all their active surface plane,

  parallel to a uniform distance to the connecting pieces

  3, 4, each having a plurality of relatively large orifices 23, 24. On the other hand, as soon as, when

  the compression of the springs, the connecting pieces

  8, 9 move upward

  port to the external connection unit 3, 4, as a result of the resulting volume changes, the static pressure

  damping liquid rises in the upper cavity

  13 due to the absence of counterpressure on its opposite side, can yield without obstacle and deform until it rests on the inner surface of the connecting piece 3. C ' is only once this state is reached that the effect

  depreciation occurs. Conversely, the membrane

  31 can also easily adapt to

  pressure balancing delayed by the choking effect

  overflow piercing 29 under the influence of the atmospheric pressure acting on its opposite side, so that the disadvantageous appearance of a depression

  in the lower cavity 14 is avoided at first.

  With the reversal of the pace of movement when

  the relaxation of the springs, the processes described are also

inversely in the cycle.

  The engine bearing shown in FIG.

  constructed, in its essential parts, of the same

  The above described step and therefore the same numerical references are valid in both cases. However, unlike the previous bearing, the inner connecting pieces 8, 9 have,

  in the case of FIG. 2, orifices 28, 29 allow

  both the passage without throttling effect of the fluid of

  death and, instead of two membranes, a single

  membrane 50 extends with a symmetrical central arrangement

  through the cavity 11 which serves as a discharge compartment. The membrane 50 is inserted between two rigid stop plates 51, 52, at a short distance from which both sides extend, and which also have perforations 53, 54. A narrow drilling of

  overflow 55, which passes through rooms 50, 51, 52

  superimposed establishes communication with

  between the partial compartments located on the

  other of the membrane 50 to allow the passage of the li-

  damping during the movements of the springs.

  The mode of operation of this variant of

  the invention is similar to that which has been described in

  pos of Figure 1. According to the direction of movement of

  spells, the membrane 50 is applied selectively against one or other of the rigid stop plates 51, 52, while the perforations 53, 54 provided therein allow its free deformation in both directions without this deformation be embarrassed by air mattresses

or disruptive liquid.

Claims (5)

  1) Elastic bearing, in particular for motors of   installed in motor vehicles,   carrying spring elements made of rubber or   rubber-like plastic housed between   rigid connection pieces and in connection with   with them, and a damping device in the form of a cavity delimited by a   external connection piece and the elements of   at least partly filled with a liquid or a cushioning mass and opened through overflow holes of an inner connecting piece, and   of a flexible membrane, covering this cavity, and de-   formable under the effect of the pressure of the damping liquid   the said landing being characterized in that at the   brane (30, 31; 50) on its opposite side to the liquid of   mortise, is associated a rigid abutment plate (3, 4; 51, 52) having perforations (23, 24; 53, 54) which, in the deformed state of the membrane, are closed off tightly by it.   2) Bearing according to claim 1, characterized in that the stop plate is constituted by a piece of external connection (3, 4).   3) Bearing according to claim 2, comprising two sets of spring elements arranged opposite one of   the other between two external connection pieces, the-   said bearing being characterized in that to two pieces of   external connections (3, 4) are associated with respective nes (30, 31).   4). Bearing. according to claim 1, comprising two sets of spring elements arranged opposite one of   the other between two external connection pieces, the-   said bearing being characterized in that a single membrane   (50) is arranged centrally between the two sets of   spring elements (6, 7) and in that thrust plates   respective ones (51, 52) are associated with said membrane, each on one side of it.   Bearing according to claim 4, characterized by   overflow holes (55) which are constantly open,   pouring the diaphragm (50) and the two stop flanges (51, 52).   6) Bearing according to one of claims 1 to 5,   characterized in that the membranes, in the undeformed state,   are arranged at a small distance, from a large order   one or a few millimeters in front of stop.   7) Bearing according to one of Claims 1 to 6,   characterized in that the membranes are provided with arma- textile reinforcement.