JPS60175836A - Vibro-isolating rubber mount - Google Patents

Abstract

PURPOSE:To effectively obtain a vibro-isolating effect in a range of high and low frequency, by mutually connecting a plurality of pocket parts, provided around a shaft core in a rubber elastic member, through an orifice and allowing fluid to flow communicating with each other between these pocket parts. CONSTITUTION:A cushion rubber structure 2 consists of a round annular rubber elastic member 16, having in its center part a mounting hole 14 for a predetermined mounting shaft to be inserted, while provides in said rubber elastic member 16 a plurality of pocket parts, constituted by the first pocket part 18 and the second pocket part 20, so as to be independently positioned around said mounting hole 14. Further these plural pocket parts 18, 20, being provided so as to be alternately positioned on almost the same circumference, are opened respectively in a side surface of the rubber elastic member 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating rubber mount, which can exhibit effective damping characteristics against not only high frequency vibrations but also low frequency vibrations, and which is designed to receive vibration loads mainly in the axial direction. This relates to a vibration-proof rubber mount.

Conventionally, anti-vibration rubber mounts (vibration-isolating supports) have been widely used as automobile body mounts or cab mounts, tension ronds or strut bar cushions, and the like.

In recent years, the requirements for vibration isolation against vibration and noise have been increasing, and the existing anti-vibration rubber mounts have had the problem of not being able to adequately meet these requirements. There is. For example, in order to reduce various vibration noises such as road noise, harshness, and flutter, for such a vibration-proof rubber mount,
It is required to simultaneously have a low dynamic spring constant in the high frequency range and high damping performance in the low frequency range, but with conventional rubber mounts, it is extremely difficult to achieve both such anti-vibration properties. It was difficult.

Of course, the vibration-proofing properties of a rubber material are largely determined by its shape and rubber material. For example, it becomes difficult to obtain a low dynamic spring constant.

On the other hand, in order to meet such demands, an elastic support body having a structure that utilizes the elasticity of rubber and the flow resistance of an incompressible fluid has been proposed, such as in Japanese Patent Publication No. 4B-36151.

This fluid-filled elastic support has a damping effect due to the elasticity of the rubber, and a predetermined fluid passes through an orifice that communicates between two separately formed chambers, thereby providing a damping characteristic against low-frequency vibrations. This made it possible to satisfy the low dynamic spring characteristics and high damping characteristics, but unlike the vibration isolators for Strathotohar or Tension Rono F, the main load was not applied in the axial direction. For rubber mounts that can be assembled to receive the fluid, the direction in which the load is applied and the mounting structure must be considered, such as the arrangement of the pockets in which the fluid is to be sealed and the orifices that communicate with them. It was difficult to apply conventional fluid-filled mounts or bushings as they were due to the above limitations, as well as the constraints on molding a rubber mount with such a structure. .

Here, the present invention has been made in view of the above circumstances, and its purpose is to provide a system mainly in the axial direction that can simultaneously satisfy low dynamic spring characteristics and high damping characteristics. An object of the present invention is to provide a vibration-proof rubber mount that can receive vibration loads. - In order to achieve the object, the present invention includes (a) an annular rubber elastic member through which a predetermined mounting shaft is inserted and which is taken up so as to receive the main load in the axial direction; (b) a plurality of blurs 7 provided within the rubber elastic body, located independently around the axis thereof, and each opening on substantially the same circumference on the outer peripheral surface of the rubber elastic body; and (C) integrally provided on the outer peripheral surface of the rubber elastic body in the circumferential direction so as to close the openings of the plurality of pockets, and corresponding to the openings of each of the pockets. (d) an orifice forming member that is combined with the ring-shaped metal fittings and forms an orifice that allows the plurality of pocket parts to communicate with each other between the ring-shaped metal fittings; e) Enclosed in the plurality of pocket parts, based on the deformation effect due to the load applied to the rubber elastic body,
The anti-vibration rubber mount is configured to contain a predetermined incompressible fluid that is caused to flow between the plurality of pockets through the orifice.

Preferably, in the present invention, two such anti-vibration rubber mounts are assembled in a back-to-back-U state with a predetermined holding member in between, and are straddled between them. It achieves a vibration-proofing effect on the shaft of the strut bar or tensile iron rod that is inserted, but a plurality of holes and holes provided around the shaft center in the rubber elastic body interact with each other through an orifice. Since these parts are connected to each other and fluid is allowed to flow between them, there is an effective damping effect against vibrations in the low frequency range due to the resistance of fluid flow between these parts. On the other hand, with respect to vibration noise in the crystal frequency range, it is possible to exhibit an effective reduction effect by lowering the dynamic spring constant of the rubber elastic body. Effective vibration damping effects can be achieved in both high and low frequency ranges.

Moreover, in the anti-vibration rubber mount structure according to the present invention, the plurality of pockets are formed on the side surface (circular surface) of the rubber elastic body.
At the same time, by removing a predetermined orifice forming member through a ring-shaped metal fitting that is integrally provided in such an opening and surrounds the rubber elastic body, a plurality of orifices can be formed. An orifice is effectively formed in the circumferential direction of the rubber elastic body to allow the pocket portions to communicate with each other, thereby advantageously providing a fluid-filled mount in a rubber mount that receives main charge in the axial direction. It has become. In addition, in such a structure, all restrictions on the molding structure of the pocket portion and orifice portion are eliminated (with M, a structure capable of exhibiting the effective vibration damping characteristics described above could be provided). .

Hereinafter, in order to further clarify the present invention in perspective, Embodiment G in which the present invention is applied to a vibration isolating device for a strut bar in an automobile suspension system will be described in detail based on the drawings. shall be.

First of all, FIG. 1 shows that a stratoharth 4
The figure shows the state in which it is assembled to the bracket 6 on the vehicle body side. The cushion rubber body 2 has an annular shape as a whole, and a pair 2.2 of the cushion rubber bodies 2 and 2 are assembled concentrically back to back with a bracket 6 on the vehicle body side in between. One end of the striker 4 is inserted into the 2.2, and the seat plate 10.1 is inserted at both ends while the inner sleeve 8 is interposed inside.
0 is arranged, and the strut bar is used in a state where it is tightened to the stepped part of the strut bar 4 by the moon naso 1-12, and the other end is connected to the axle side. . Both of the isolation rubber bodies 2, 2 have the same structure, and the back side thereof is shown in detail in FIGS. 2 to 7.

By the way, such a cushion rubber body 2 is shown in FIGS. 2 to 6.
As is clear from the figure, the specified mounting shaft is inserted through the center.
The first pocket part 1Σ( A plurality of pockets 1 and 2 are formed within the rubber elastic body 16.

The plurality of pockets 18 and 20 are provided and opened on the side surface (periphery) of the rubber elastic body 16 so as to be alternately located on substantially the same circumference.

As clearly shown in FIGS. 4 and 5, among the plurality of pocket sections, the first pocket section 18 has a predetermined depth in the half tL direction within the rubber elastic body 16. , and is formed as a recess extending in a fan shape in the circumferential direction, and has a structure that can be deformed by a load in the compression direction (axial direction) acting on the rubber elastic body 16, and its internal volume can be reduced. On the other hand, the second blur
A part of the surrounding wall (peripheral wall) of the l.rfl 120 is a thin wall portion 22 with slack, and when a compressive load as described above is applied to the rubber elastic body 16, the thin wall portion 22 deforms in the opposite direction. The inner volume of the second pocket portion 20 is increased to 1”I.The thin wall portion 22 of the second pocket portion 20 is provided with a recess 24 extending from the end of the rubber elastic body 16 in the axial direction. The second pocket portion 20 is formed by forming a thin wall between the bottom surface and the inner wall surface of the second pocket portion 20.

In addition, the cross section is approximately [1-shaped ring-shaped metal fitting 2G is vulcanized and bonded] so that the opening of each pocket portion 18.20 opening on the circumferential surface of the rubber elastic body 16 is located at The opening 1'' of each pocket portion 18, 20 is closed by the ring-shaped metal fitting 26. As shown in FIG. 7, this ring-shaped metal fitting 26 has a cross section shaped like the letter U, and a window portion 28 corresponding to the size of the opening of each of the pocket portions 18 and 20 is provided at the bottom of the U-shape.
through the window 28, and each pocket 18.
20 is opened outward.

Two orifice forming rings 30 and 30 having a substantially semicircular shape are combined with such a ring-shaped fitting 26, and between the ring-shaped fitting 26 and the ring-shaped fitting 26, As shown in the figure, these pocket parts 1
8.20 to form an orifice 32 of 1 μm.

More specifically, an orifice forming groove 34 is provided in the circumferential direction on the inner peripheral surface of the orifice forming ring 3°C,
Such an orifice forming ring 30 is attached to the ring-shaped metal fitting 2.
The orifice forming ring 30 is fixed within the ring-shaped fitting 26 by storing it in the U-shape of the ring-shaped fitting 26 and bending the end of the ring-shaped fitting 2G by caulking or the like.
If it is shifted, the orifice forming groove 34 on the inner circumferential surface of the orifice forming ring 30 will be windowed at the bottom surface of the ring-shaped metal fitting 2G, thereby forming the orifice 32 that is eye-catching. . Furthermore, since the orifice forming groove 34 extends over the window 28 of the ring-shaped fitting 26, each pocket 18.20 is connected to the orifice 32 through the window 28, and thus the orifice 32 is connected to the orifice 32. Adjacent pocket portions 18 and 2 via orifice 32
0 will be made to communicate with each other.

In this way, the ring-shaped metal fitting 26 is integrally installed so as to be located at the opening 1''2 of the blurring part 18.20 and to surround the outer peripheral surface of the rubber elastic body 16. , only a part of it, specifically only the bottom part of the U-shape, is buried in the rubber elastic body 16, but the other part is buried laterally (outward) from the outer peripheral surface of the rubber elastic body 16.
It is in a state where it is made to protrude.

The plurality of pockets 1B and 20 thus formed in the rubber elastic body 1G are filled with a predetermined non-compressible material such as polyalkylene glycol such as polyethylene glycol or polypropylene glycol, silicone oil, or water. A rubber elastic body 1 in which a sexual fluid is enclosed
6, the ring-shaped metal fitting 26 and the orifice forming ring 3
Through an orifice 32 formed between the pockets 18 and 20, fluid flow can be established between the pockets 18 and 20.

Incidentally, it is possible to obtain the soap rubber body 2 in the following manner, for example. Zunawaji, first of all,
The rubber elastic body 16 is vulcanized and molded using a predetermined mold, and a U is formed at the opening position of the pocket portion 18.20 on the side surface of the rubber elastic body 16.
A ring-shaped metal fitting 26 having a hand-shaped cross section is positioned so that the window portions 28 formed in the ring-shaped metal fitting 26 correspond to the openings of the pocket portions 18 and 20, respectively, and
Vulcanization adhesion-B tighten. Next, with the obtained rubber elastic body 16 immersed in a predetermined incompressible fluid, the orifice forming ring-shaped fitting 30 is accommodated in the ring-shaped fitting 26, and the end of the ring-shaped fitting 26 is By caulking, the orifice forming ring 30 is made liquid-tight.
It is fixed within the link-shaped fitting 26 to complete the desired cushion rubber body 2. by this,
A predetermined fluid is sealed in the two types of plurality of pockets 18; 20, and an orifice 32 is formed to communicate with these pockets. At the same time, the assembly (=J) can be easily performed, and the molding thereof can also be easily performed.

The cushion rubber bodies 2 are used in pairs as shown in FIG.
This will result in being kicked.

In view of the large vibration load mainly in the low frequency range, both cushion rubber bodies 2, 2 are compressed or tightened in the axial direction at the intersection σ, resulting in two types of pockets in each cushion rubber body 2. Between Section 18.20,
The fluid moves through the orifice 32, and the flow resistance generated at this time can effectively attenuate such vibrations in the low frequency range.

More specifically, the rubber elastic body 16 of the cushion rubber body 2
Due to the axial compressive load received by
The portion 18 is deformed, its internal volume is reduced, and the non-1:tiif fluid sealed therein is discharged to the outside of the pocket portion.On the other hand, the second pocket portion In the case of the section 20, due to the existence of the thin section 22, even if a compressive load as mentioned above is applied,
Since the internal volume of the first pocket part 18 is structured to be able to be increased, the fluid in the first pocket part 18 flows into the second pocket part 20 side through the orifice 32, and due to dirt, This results in a certain flow resistance.

In addition, when a vibration load in a high frequency range is applied to the cushion rubber body 2, the dynamic Bao constant of the rubber material itself constituting the rubber elastic body 16 of the rubber body 2 is made sufficiently low. , such vibration loads in the high frequency range are effectively absorbed mainly by the elastic deformation action of the rubber elastic body 16, and thus, in accordance with the high m and damping performance in the low frequency range,
This makes it possible to obtain a low dynamic spring constant in the high frequency range.

And with that, Lautno Is, Versive.

It is now possible to effectively suppress vibration noise such as noise and flagging, and it has become possible to fully meet the recent high demands for vibration and noise countermeasures.

Furthermore, in the cushion rubber body 2 of the upper structure,
Since the ring-shaped metal fitting 26 is provided in a state of protruding outward from the side surface of the rubber elastic body 16, the ring-shaped metal fitting 2
G is bracket 6 on the vehicle side, both, J? This causes interference with the seat plate 10 of the seat plate 10, and for this reason, it also has the feature of functioning as a stopper against excessive loads.

In addition, in this way, the dimensions such as the length and cross-sectional area of the orifice 32 formed by the ring-shaped metal fitting 26 and the orifice forming ring 30 can be changed as appropriate. Since the aforementioned flow resistance can also be changed, by adjusting the orifice dimensions, it is possible to change the attenuation coefficient and Rhinohane constant in the target frequency range.

In addition, the size and shape of such an orifice part can be determined by selecting the material of the ring 30 forming the orifice 32, for example, a material such as metal or plastic, an elastomer such as rubber, or even a material such as urethane foam. By selecting the desired characteristics, it is possible to satisfy the required characteristics. When forming the orifice 32, it is most preferable to combine the illustrated U-shaped ring-shaped fitting 26 and the orifice forming ring 30 housed therein, but the length and shape of the orifice forming ring 30 are There is no problem even if the desired orifice is formed by changing or using other combination structures, and the orifice forming groove 34 may be provided on the ring-shaped metal fitting 26 instead of on the orifice forming ring 30 side. Furthermore, there is no difference whatsoever even if both are provided, and furthermore,
Only one orifice may be provided, or a plurality of orifices may be provided.

Furthermore, a ring-shaped metal fitting 26 and an orifice forming ring 30
Because a fluid is sealed in each pocket 18, 20, it is necessary to assemble the orifice forming ring 30 in a fluid-tight state.
If a material made of an elastomer such as rubber or urethane foam is used as the material, an effective seal can be formed between the metal ring and the ring-shaped metal fitting 26 by compression. A structure in which a sealing means is interposed between the ring-shaped fitting 26 and the orifice forming ring 30 may also be adopted as appropriate.

In addition, the present invention can be implemented in various changes, modifications, and improved forms in addition to the specific examples exemplified above.
．． It is possible to change the number, shape, or arrangement of the 20, to change the object of application, for example, to apply it to a body mount, or to create a vibration-isolating support structure using only one of the above-mentioned cushion rubber bodies. etc., there are various embodiments based on the knowledge of those skilled in the art, including misfire 1.
O farmer, it includes any of these aspects,
It goes without saying.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing a structure in which a strut bar and a vehicle body are separated using an example of a vibration-proof rubber mount according to the present invention, and FIG. It is a perspective view showing an example of a body,
Figure 3 is a partially cutaway front view (IL-T in Figure 5).
(corresponding to a V-concave cross section), and FIG. 4 is a plan sectional view thereof,
Fig. 5 is a sectional view taken along the line V-V in Fig. 3, Fig. 6 is a sectional view taken along the line Vl-Vl in Fig. 3, and Fig. 7 shows the ring-shaped metal fittings and orifice forming ring used in the sosion rubber body. FIG. 2: Cushion rubber body 4: Strut bar'- 6: Vehicle side bracket 8: Inner sleeve 14: Mounting hole 16: Rubber elastic body 18; First pocket part 20: Second pocket part 22: Thin wall part 24: Recess 26: Ring-shaped metal fitting 28: Window 30 Niorifice forming ring 32 Niorifice 34 Niorifice forming groove @2 diagram

Claims (5)

[Claims] (1) An annular rubber elastic body into which a predetermined mounting shaft is inserted and tightened so as to receive the main load in the axial direction; a plurality of pockets each opening on substantially the same circumference on the outer peripheral surface of the rubber elastic body; a ring-shaped metal fitting that is integrally provided on the outer circumferential surface in the circumferential direction and has a predetermined window portion corresponding to the opening of each of the respective blurs 71; an orifice forming part that forms an orifice that connects the plurality of pocket parts with the metal fitting; A vibration isolating rubber mount comprising: a predetermined incompressible fluid that is made to flow between the plurality of bogged down parts. (2) The plurality of pocket portions include a first pocket portion whose internal volume is reduced by a compressive load acting on the rubber elastic body, and a portion of the surrounding wall made thin so that the compressive load acts on the first pocket portion. 2. The anti-vibration rubber mount according to claim 1, further comprising a second pocket portion whose internal volume can be increased even when the vibration is removed. (3) The anti-vibration rubber mount according to claim 2, wherein the first pocket portion and a portion of the second bow are alternately arranged around the axis of the rubber elastic body. . (4) A groove extending in the circumferential direction of the rubber elastic body is formed in at least one of the ring-shaped fitting and the orifice forming member, and the groove is formed by overlapping the link-shaped fitting and the orifice forming member. The anti-vibration rubber mount according to any one of claims 1 to 3, wherein an orifice is formed by closing a lid to allow a portion of the plurality of holes 1 to communicate with each other. (5) The ring-shaped metal fitting has a U-shape that opens outward, and the window portion is formed at the bottom of the 0-shape,
The vibration-proof rubber mount according to any one of claims 1 to 4, wherein the orifice forming member is accommodated and fixed within the U-shape of the ring-shaped metal fitting.