JP2004068938A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of obtaining a damping effect and a spring lowering effect for not only an input of vertical direction vibration but also an input of a peripheral direction. <P>SOLUTION: This vibration control device is constituted of a cylindrical metal fitting 1, a mounting metal fitting 2, an intermediate cylinder 3 internally fitted into the cylindrical metal fitting 1, an elastic body 4 to connect the mounting metal fitting 2 and the intermediate cylinder 3, a diaphragm 5 to constitute a liquid chamber together with the elastic body 4, a partition member 6 for partitioning the liquid chamber in the vertical direction of the elastic body 4 side and the diaphragm 5 side, and an orifice 7<SB>AB</SB>to communicate the partitioned upper liquid chamber A and lower liquid chamber B. A plurality of peripheral liquid chambers C and D independent in the peripheral direction are provided between the cylindrical metal fitting 1 and the elastic body 4. Preferably, two pairs of the peripheral liquid chambers facing to each other are provided. The one peripheral liquid chamber C<SB>1</SB>on a high rigidity side and the one peripheral liquid chamber D<SB>1</SB>on a lower rigidity side are communicated by an orifice 7<SB>C1D1</SB>. The other peripheral liquid chamber C<SB>2</SB>on the high rigidity side and the other peripheral liquid chamber D<SB>2</SB>on the low rigidity side are communicated by an orifice 7<SB>C2D2</SB>. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-vibration device that is applied to, for example, an automobile, a general industrial machine, or the like and absorbs vibration from a vibration generating unit. The present invention relates to a vibration device.
[0002]
[Prior art]
Conventionally, a vibration isolator as an engine mount has been installed between an engine serving as a vibration generating unit of a vehicle and a vehicle body serving as a vibration receiving unit, and the vibration generated by the engine is absorbed by the vibration isolating device. , Is prevented from being transmitted to the vehicle body. As this type of vibration isolator, there is known a vibration isolator in which a liquid chamber is constituted by an elastic body and a diaphragm, the liquid chamber is divided into two upper and lower chambers by a partition member, and an orifice communicating the upper and lower liquid chambers is provided. I have.
[0003]
For example, the conventional vibration isolator shown in a longitudinal sectional view in FIG. 2 connects an intermediate cylinder 13 fitted inside a cylindrical metal fitting 11 and a mounting metal fitting 12 with an elastic body 14, and the elastic body 14 and the diaphragm 15 The liquid chamber thus configured is partitioned into an upper liquid chamber A ′ and a lower liquid chamber B ′ by a partition member 16, and the upper liquid chamber A ′ and the lower liquid chamber B ′ are communicated by an orifice 17. The orifice 17 has a vibration damping function and a vibration insulating function together with the elastic body 14 due to a liquid flow effect between the upper liquid chamber A ′ and the lower liquid chamber B ′.
[0004]
[Problems to be solved by the invention]
However, in the conventional vibration isolator, the orifice 17 functions for inputting vibration in the vertical direction, but the orifice 17 does not contribute to input in the circumferential direction. That is, the vibration in the circumferential direction is exclusively absorbed by the elastic body 14, and the damping effect or the effect of lowering the spring due to the presence of the orifice 17 cannot be expected as in the case of the vertical direction.
[0005]
Therefore, an object of the present invention is to provide an anti-vibration device that can obtain an attenuation effect and an effect of lowering a spring not only for input of vibration in the vertical direction but also for input in the circumferential direction. It is.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to solve the above problems, and the gist of the invention is that a cylindrical metal fitting attached to one of a vibration receiving unit and a vibration generating unit, and a vibration generating unit or a vibration receiving unit. A mounting bracket attached to the other, an intermediate cylinder fitted inside the cylindrical metal fitting, an elastic body connecting the mounting bracket and the intermediate cylinder, a diaphragm forming a liquid chamber together with the elastic body, and a liquid chamber having an elastic body side. A vibration isolator comprising a partition member for vertically partitioning the diaphragm side and an orifice communicating the partitioned upper liquid chamber and lower liquid chamber, wherein a circumferential direction is also provided between the cylindrical fitting and the elastic body. And a vibration isolator having a plurality of peripheral fluid chambers independent of each other.
[0007]
Preferably, the peripheral fluid chamber comprises a plurality of sets of a pair of peripheral fluid chambers facing each other. Here, in particular, it is preferable that there are two pairs of peripheral fluid chambers facing each other, with one of the peripheral fluid chambers having high rigidity and the other of the peripheral fluid chambers having low rigidity. In this case, for example, the upper wall of the elastic body constituting one set of the peripheral fluid chambers may be thickened, and the upper wall of the elastic body constituting the other set of the peripheral fluid chambers may be thinned.
[0008]
Also, the one peripheral fluid chamber on the high rigidity side and the one peripheral fluid chamber on the low rigidity side communicate with the orifice, and the other peripheral fluid chamber on the high rigidity side and the other peripheral fluid chamber on the low rigidity side are connected. It is preferable that the peripheral fluid chamber is communicated with the orifice by an orifice. Further, the peripheral fluid chamber on the higher rigidity side is arranged in the direction in which the spring is to be released, and the peripheral fluid chamber on the lower rigidity side is shifted by 90 ° from the peripheral fluid chamber on the higher rigidity side. Is preferably arranged.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The vibration damping device of the present invention has a cylindrical metal fitting attached to one of the vibration receiving section and the vibration generating section, a mounting metal fitting attached to the other of the vibration generating section or the vibration receiving section, and is fitted inside the cylindrical metal fitting. An intermediate cylinder, an elastic body that connects the mounting bracket and the intermediate cylinder, a diaphragm that forms a liquid chamber together with the elastic body, a partition member that partitions the liquid chamber in the vertical direction between the elastic body side and the diaphragm side, The orifice communicates with the liquid chamber and the lower liquid chamber.
[0010]
That is, due to the vibration damping effect of the elastic body connecting the mounting bracket and the intermediate cylinder, and the liquid flow effect between the upper and lower liquid chambers by the orifice, it has a vibration damping function and a vibration insulating function with respect to the input in the vertical direction. Between the engine serving as the vibration generating unit and the vehicle body serving as the vibration receiving unit, absorbs the vertical vibration generated by the engine and prevents the vibration from being transmitted to the vehicle body. Therefore, the anti-vibration device of the present invention exhibits the same performance as that of a conventional device against vertical vibration input.
[0011]
The vibration damping device of the present invention characteristically has a plurality of circumferential fluid chambers that are independent in the circumferential direction also between the cylindrical fitting and the elastic body. That is, by providing a plurality of peripheral liquid chambers in addition to the upper liquid chamber and the lower liquid chamber, a sufficient vibration damping function and vibration insulating function can be provided even for input in the circumferential direction.
[0012]
To explain this point in more detail, the elastic body in the vibration isolator of the present invention has a main body portion composed of a vertical block and a circumferential block, and the liquid chambers have wall surfaces of each block, It is a part of the space partitioned by the partition member or the wall surface of the cylindrical fitting. Therefore, by appropriately setting the shape and number of the blocks constituting the main body of the elastic body, it is possible to adjust the size, position, number and the like of the peripheral fluid chamber.
[0013]
Here, it is preferable that the peripheral fluid chamber includes a plurality of sets of a pair of peripheral fluid chambers facing each other. This is because by making the pair of peripheral fluid chambers facing each other the same rigidity and changing the rigidity of the pair of peripheral fluid chambers and the other pair, it is possible to select the direction in which the spring is released.
[0014]
However, even if the number of sets is increased unnecessarily, the shape of the elastic body becomes complicated, but it becomes difficult to make a difference in spring depending on the direction. It is preferable that the rigidity is high on the peripheral fluid chamber side and the rigidity is low on the other set of peripheral fluid chambers.
[0015]
In this case, the means for providing a difference in rigidity is not particularly limited. For example, the upper wall of the elastic body constituting one set of the peripheral fluid chambers is thickened, and the upper wall of the elastic body constituting the other set of the peripheral fluid chambers is thickened. It is easiest and most effective to make the difference in rigidity by reducing the thickness. That is, when the upper wall is thicker, the volume of the liquid chamber becomes smaller, and when the upper wall is thinner, the liquid chamber becomes larger. Therefore, only by adjusting the thickness of the upper wall, the rigidity difference between the elastic body and the rigidity due to the liquid chamber is increased. This is because a synergistic effect can be expected.
[0016]
Also, like the upper and lower liquid chambers, a plurality of peripheral liquid chambers communicate with each other through an orifice to obtain a liquid flow effect. However, if there is a difference in rigidity, one of the peripheral liquids on the higher rigidity side An orifice connects the chamber with one of the peripheral fluid chambers on the lower rigidity side, and another orifice communicates with the other peripheral fluid chamber on the higher rigidity side and the other peripheral fluid chamber on the lower rigidity side. Is preferred. By doing so, resonance due to the internal pressure difference between the peripheral fluid chambers can be generated with respect to the input in the circumferential direction, and attenuation due to the resonance of the liquid can be expected.
[0017]
Further, it is preferable to arrange the peripheral fluid chamber on the higher rigidity side in the direction in which the spring is to be provided, and dispose the peripheral fluid chamber on the lower rigidity side by 90 ° from the peripheral fluid chamber on the higher rigidity side. This is because, by shifting the low rigidity side by 90 °, the direction in which the spring comes out is prominent.
[0018]
【Example】
Hereinafter, specific examples of preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing an example of the vibration isolator of the present invention, wherein FIG. 1 (A) is a cross-sectional view, and FIG. 1 (B) is a vertical cross-sectional view taken along the line PP ′ of FIG. 1 (A). It is. The embodiment shown in FIG. 1 is a vibration isolator installed between an engine of an automobile and a vehicle body, and includes a cylindrical metal fitting 1, a mounting metal fitting 2, and an intermediate cylinder 3 fitted inside the cylindrical metal fitting 1. And an elastic body 4 for connecting the mounting bracket 2 and the intermediate cylinder 3 to each other. The elastic body 4 is made of rubber, and mainly serves as a vibration isolator.
[0019]
Then, as shown in FIG. 1 (B), and the elastic body 4 and the diaphragm 5 is partitioned vertically by the partition member 6, the upper fluid chamber A and the lower fluid chamber B which communicates with an orifice 7 _AB is constituted . Therefore, the attenuation in the vertical direction is obtained by the liquid flow effect of the orifice 7 _AB that connects the upper liquid chamber A and the lower liquid chamber B.
[0020]
As shown in FIG. 1 (B), there is also a peripheral fluid chamber C and a peripheral fluid chamber D which are circumferentially independent between the cylindrical fitting 1 and the elastic body 4, and the peripheral fluid chamber C is formed of the elastic body 4. thick top wall 4 is composed of _C and the lower wall 4 _a, the circumferential liquid chambers D is constituted by the thin top wall 4 _D and the lower wall 4 _a resilient member 4 of.
[0021]
Circumferential fluid chamber C and the circumferential liquid chambers D shown in FIG. 1 (B), as shown in FIG. 1 (A), the circumferential liquid chambers C ₁ and the circumferential liquid chambers C _2, the circumferential liquid chambers D ₁ and the circumferential liquid chambers D has become a _second set, the circumferential liquid chambers C ₁ and the circumferential fluid chamber C ₂ and the mutually facing pair of set, becomes the circumferential fluid chamber D ₁ and the circumferential fluid chamber D ₂ and the mutually facing pair of other set I have. Therefore, the circumferential liquid chambers C ₁ and the circumferential liquid chambers C ₂ a is thick upper wall 4 _C of the elastic body 4 constituting, the upper wall 4 _D of the elastic body 4 constituting the circumferential liquid chambers D ₁ and the circumferential liquid chambers D ₂ The peripheral fluid chambers are thinner, and the rigidity is higher on _one of the peripheral fluid chambers C ₁ and C ₂ , and the rigidity is lower on the other set of peripheral fluid chambers D ₁ and D ₂ .
[0022]
Furthermore, communicating one with the circumferential fluid chamber D ₁ of the one circumferential fluid chamber C ₁ and the low rigidity side highly rigid side is an orifice 7 _C1D1, and the other one of the circumferential liquid chambers of high rigidity side C ₂ a peripheral fluid chamber D ₂ of the low side of the other rigid and is in communication with the orifice 7 _c2d2. Therefore, the input of the circumferential direction, the circumferential liquid chambers C ₁ and the internal pressure difference between the circumferential liquid chambers D ₁ is generated, the internal pressure difference even in the circumferential liquid chambers C ₂ and the circumferential liquid chambers D ₂ will occur results Then, the liquid resonates and exhibits an attenuation effect.
[0023]
By the way, when the anti-vibration device of the present invention is installed between an engine and a vehicle body of an automobile, an arrangement having a difference in rigidity is provided so that a damping effect due to liquid resonance and an effect of lowering a spring can be sufficiently exhibited. I do. Here, in the vibration isolator of the embodiment shown in FIG. 1, the peripheral fluid chambers C ₁ and C ₂ on the high rigidity side facing each other at 180 ° and the peripheral fluid chambers D on the low rigidity side facing each other at 180 °. ₁ and D ₂ are shifted by 90 °. Therefore, in the anti-vibration device of the embodiment, the peripheral fluid chambers C ₁ and C ₂ may be directed in the direction in which the spring is desired to come out.
[0024]
【The invention's effect】
Since the vibration damping device of the present invention has a plurality of circumferential fluid chambers that are independent in the circumferential direction between the cylindrical fitting and the elastic body in addition to the upper fluid chamber and the lower fluid chamber, the vibration input in the vertical direction can be performed. In addition to the above, the damping effect and the effect of lowering the spring can be obtained not only for the input in the circumferential direction but also for the input in the circumferential direction.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a vibration isolator according to the present invention. FIG. 1 (A) is a cross-sectional view, and FIG. 1 (B) is a view taken along the line PP ′ of FIG. 1 (A). It is a longitudinal cross-sectional view.
FIG. 2 is a longitudinal sectional view showing a conventional vibration damping device.
[Explanation of symbols]
1 ‥ tubular fitting 2 ‥ mounting bracket 3 ‥ intermediate cylinder 4 ‥ elastic body _{4 A} ‥ lower wall ₄ C, _{4 D} ‥ top wall 5 ‥ diaphragm 6 ‥ partition member _{7 AB, 7 C1D1, 7 C2D2} ‥ orifice A ‥ on Liquid chamber B ‥ Lower liquid chambers C, C ₁ , C ₂ , D, D ₁ , D ₂ ‥ Surrounding liquid chamber 11 ‥ Cylinder fitting 12 ‥ Mounting fitting 13 ‥ Intermediate cylinder 14 ‥ Elastic body 15 ‥ Diaphragm 16 ‥ Partition member 17 orifice A '‥ upper liquid chamber B' ‥ lower liquid chamber

Claims (6)

A cylindrical fitting (1) attached to one of the vibration receiving section and the vibration generating section, a fitting (2) attached to the other of the vibration generating section or the vibration receiving section, and an inner fitting to the cylindrical fitting (1). An intermediate cylinder (3), an elastic body (4) for connecting the mounting bracket (2) and the intermediate cylinder (3), a diaphragm (5) forming a liquid chamber together with the elastic body (4), and a liquid chamber. an elastic body (4) side and the diaphragm (5) side of the partition member (6) which divides the vertical direction, partitioned upper fluid chamber (a) and the lower fluid chamber (B) orifice and communicating (7 _AB) A plurality of peripheral fluid chambers (C, D,...) That are independent in the circumferential direction between the cylindrical fitting (1) and the elastic body (4). Characteristic anti-vibration device. 2. The vibration isolator according to claim 1, wherein the peripheral fluid chambers (C, D,...) Include a plurality of sets of a pair of peripheral fluid chambers facing each other. There are two pairs of peripheral fluid chambers facing each other, the rigidity of _one of the peripheral fluid chambers (C ₁ , C ₂ ) is high, and the rigidity of the other peripheral fluid chamber (D ₁ , D ₂ ) is high. The vibration isolator according to claim 2, wherein the vibration isolator is low. Elastic one of the set of circumferential liquid chambers elastic body constituting the _{(C 1, C 2) (} 4) of the upper wall _{(4 C)} is thick, constitute another set of circumferential fluid chamber _(D 1, _{D 2)} body (4) vibration isolating apparatus according to claim 3, the top wall (4 _D) be characterized by thin. One of the peripheral fluid chambers (C ₁ ) on the higher rigidity side and one of the peripheral fluid chambers (D ₁ ) on the lower rigid side communicate with each other through the orifice (7 _C1D1 ), and the other peripheral fluid chamber on the higher rigidity side. the liquid chamber (C ₂₎ and the low rigidity side of the other circumferential fluid chamber (D ₂₎ and the vibration isolating apparatus according to claim 3 or 4, wherein the communicating with the orifice (7 _c2D2). The peripheral fluid chambers (C ₁ , C ₂ ) on the higher rigidity side are arranged in the direction in which the spring is to be released, and the peripheral fluid chambers (C ₁ , C ₂ ) on the rigid side are shifted by 90 ° from the peripheral fluid chambers (C ₁ , C ₂ ) on the higher rigidity side. circumferential fluid chamber (D _{1, D 2)} vibration isolating device according to claim 3, wherein in any one of the 5 in that a.

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