JPH10132016A - Liquid filling type vibration control mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the rigidity of an elastic wall in a direction orthogonal to the axis and to effectively reduce the vibration in a low frequency range in an axial direction and the vibration in a high frequency range in a direction orthogonal to the axis. SOLUTION: A partition member 15 which divides a liquid chamber 14 into two chambers is composed of an orifice constituting body 17 and an elastic wall 18. The orifice constituting body 17 is fixed to an inner cylinder 11. The elastic wall 18 is cylindrically formed so as to be along the axial direction of the inner and outer cylinders 11 and 12. At one end of the elastic wall 18 is provided an annular seal 19 which makes a sliding and close contact with the inner circumferential surface of the outer cylinder 12. A metallic ring 20 is embedded into the annular seal 19. When the vibration in low frequency range in the axial direction is inputted, the elastic wall 18 is deformed in a compression and tension direction to reduce the amount of deformation, and when the vibration in high frequency range in a direction orthogonal to the axial direction is inputted, the elastic wall 18 is deformed in a shear direction so that it is possible to obtain a low rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled anti-vibration mount used for a support portion of a suspension member of an automobile.

[0002]

2. Description of the Related Art As a liquid-filled type vibration damping device of this type, a device as disclosed in Japanese Patent Application Laid-Open No. Hei 8-170686 has been proposed.

In this vibration isolator, as shown in FIG. 10, an inner cylinder 1 attached to a vehicle body of an automobile and an outer cylinder 2 attached to a suspension member are arranged concentrically. Rubber elastic bodies 3a, 3b
Are connected to each other, and the space surrounded by them is a liquid chamber 4, and the inside of the liquid chamber 4 is partitioned by an upper chamber 4 a by a partition member 5.
And a lower chamber 4b. And the partition member 5
Is an orifice component 7 having an annular orifice 6 communicating the upper and lower chambers 4a and 4b, and the orifice component 7
An orifice structure 7 is fixed to the outer cylinder 2 by caulking, and an inner peripheral edge of the elastic wall 8 is provided to reduce rigidity in a direction perpendicular to the axis. The longitudinal section is formed in a substantially corrugated shape, and the end peripheral region is slidably contacted with the outer peripheral surface of the inner cylinder 1.

[0004] Since the vibration isolator has the above-described structure, when vibration in the low frequency range in the axial direction is input, the inner cylinder 1
And the outer cylinder 2 are relatively displaced in the axial direction, and the liquid in the upper and lower two chambers 4a and 4b flows through the orifice 6, and as a result, the input spring is reduced by the dynamic springs of the rubber elastic bodies 3a and 3b and the resonance by the orifice 6. Is done. Also, when vibration in a high frequency range in the direction perpendicular to the axis is input, the upper and lower rubber elastic bodies 3a,
The input vibration is reduced by the dynamic spring 3 b and the elastic wall 8. In particular, since the elastic wall 8 of the partition member 5 is formed such that its inner peripheral edge portion has a substantially wavy vertical cross section, the rigidity in the direction perpendicular to the axis is set low. With a small dynamic spring, it is effectively reduced.

[0005]

However, in the above-mentioned conventional vibration isolator, the rigidity in the direction perpendicular to the axis is set low by forming the inner peripheral edge of the elastic wall 8 into a substantially wavy vertical cross section. Although the dynamic spring with respect to the vibration in the direction perpendicular to the axis can be reduced, the rigidity of the elastic wall 8 in the axial direction is reduced at the same time. Is greatly deformed, and the flow amount of the liquid in the annular orifice 6 is reduced,
This causes a problem that the damping performance with respect to the axial vibration is reduced.

Accordingly, the present invention is to reduce the rigidity of the elastic wall in the direction perpendicular to the axis without deteriorating the damping performance against the vibration in the axial direction. It is an object of the present invention to provide a liquid-filled anti-vibration mount capable of effectively reducing both of the vibrations in the high frequency range.

[0007]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that an inner cylinder and an outer cylinder which are arranged concentrically are connected to each other at both ends by elastic bodies. A space surrounded by the inner and outer cylinders and the elastic body is a liquid chamber, and one end of the liquid chamber is fixed to one of the inner and outer cylinders, and the other end slides on one of the other cylinders. It is divided into two chambers by a partition member that freely contacts,
A liquid-filled anti-vibration mount provided with an orifice communicating the two chambers with the partition member, wherein the partition member has an elastic wall in the vicinity of a close contact portion with one of the other cylinders. In the above, the elastic wall is formed in a cylindrical shape along the axial direction of the inner and outer cylinders, while the close contact portion is formed by an annular elastic body in which a hard ring is embedded, and one end of the elastic wall has The close contact portion is provided integrally. At the time of inputting the vibration in the axial direction, the elastic wall is deformed in the compression-pulling direction between the hard portion other than the elastic wall of the partition member and the high-rigidity annular close-contact portion in which the hard ring is embedded, and the direction perpendicular to the axial direction When the vibration is input,
In the same interval, the elastic wall is deformed in the shear direction. For this reason, when the vibration in the axial direction is input, the amount of deformation of the elastic wall is small, and when the vibration in the direction perpendicular to the axis is input, the low rigidity of the elastic wall can be used.

According to a second aspect of the present invention, the inner cylinder and the outer cylinder which are arranged concentrically are connected to each other at both ends by an elastic body.
A space surrounded by the inner and outer cylinders and the elastic body is a liquid chamber, and one end of the liquid chamber is fixed to one of the inner and outer cylinders, and the other end slides on one of the other cylinders. It is divided into two chambers by a partition member that freely contacts,
A liquid-filled anti-vibration mount provided with an orifice communicating the two chambers with the partition member, wherein the partition member has an elastic wall in the vicinity of a close contact portion with one of the other cylinders. In the above, the elastic wall is formed in a cylindrical shape along the axial direction of the inner and outer cylinders, while the close contact portion is formed by an annular elastic body having a thick axial thickness, and at one end of the elastic wall. The close contact portion is provided integrally. At the time of inputting the vibration in the axial direction, the elastic wall is deformed in the compression-pulling direction between the hard portion other than the elastic wall of the partition member and the annular close contact portion having a large thickness and high rigidity in the axial direction. When the vibration in the direction is input, the elastic wall is deformed in the shear direction between the vibrations. Therefore, also in this case, the deformation amount of the elastic wall becomes small when the vibration in the axial direction is input, and the low rigidity of the elastic wall can be used when the vibration in the direction perpendicular to the axis is input.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

First, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

In this embodiment, a liquid-filled anti-vibration mount according to the present invention is applied to a mount for mounting a suspension member to a vehicle body.

As shown in FIG. 1, the liquid-filled anti-vibration mount includes an inner cylinder 11 attached to a vehicle body and an outer cylinder 12 attached to a suspension member, which are arranged concentrically. The upper end portion 12 and the lower end portion 12 are connected by rubber elastic bodies 13a and 13b, respectively. These inner and outer cylinders 11, 12 and rubber elastic bodies 13a,
The space between 13b is sealed, and the space inside the sealed space is filled with a predetermined liquid to form a liquid chamber 14. And
A partition member 15 is attached to a substantially central portion of the inner cylinder 11 in the axial direction, and the inside of the liquid chamber 14 is separated by the partition member 15 into an upper chamber 14a and a lower chamber 14b.

The partition member 15 comprises an upper chamber 14a and a lower chamber 1
4b, an orifice component 17 having an annular orifice 16, an elastic wall 18 made of a rubber material fixed to the outer peripheral surface of the orifice component 17, and an elastic wall 1
An orifice structure 17 is fitted and fixed to the outer circumference of the inner cylinder 11 while the annular seal 19 is fixed to the outer cylinder 12. The inner peripheral surface is slidably in close contact with the inner peripheral surface. In the figure, reference numeral 16a denotes the upper chamber 1 of the annular orifice 16.
Reference numeral 16a denotes an opening on the side of the lower chamber 14b of the orifice 16, and 16b denotes an opening on the side of the lower chamber 14b.

Here, the elastic wall 18 is provided between the inner and outer cylinders 11,
12 is formed in a cylindrical shape along the axial direction, the inner peripheral surface of the upper end thereof is adhered to the outer peripheral surface of the orifice structure 17, and the annular seal 19 bulges radially outward at the lower end. Is formed. The annular seal 19 has a basic shape integrally formed of the same rubber material as the elastic wall 18, and has a metal ring 20 (hard ring) embedded therein to increase rigidity in the axial direction. The metal ring 20 has an inner diameter and an outer diameter which are set at least from the same inner diameter position as the inner diameter of the elastic wall 18 to a position near the inner peripheral surface of the outer cylinder 12. In the case of relative displacement in the direction, a load along the axial direction can be directly input from the annular seal 19 to the cylindrical elastic wall 18. The upper end of the elastic wall 18 is bonded to the outer peripheral surface of the orifice member 17 over a sufficient length so as to be elastic when the orifice member 17 and the annular seal 19 are relatively displaced in the axial direction. A load can be input to the elastic wall 18 from the outer peripheral surface of the orifice structure 17 without causing the wall 18 to bend.

Since the liquid-filled anti-vibration mount has the above-described configuration, the suspension member is moved from the inner cylinder 11 to the inner cylinder 11.
When low frequency range axial vibration is input to the
The two upper and lower chambers 14a, 14a,
The liquid 14b flows through the annular orifice 16, and as a result, the vibration of the elastic springs 13a, 13b and the annular orifice 16 is reduced by resonance. At this time, when the inner cylinder 11 and the outer cylinder 12 are relatively displaced in the axial direction, a load is transmitted to the elastic wall 18 between the orifice structure 17 and the annular seal 19.
8 is a cylindrical shape along the axial direction of the inner and outer cylinders 11 and 12, and the bending rigidity of the annular seal 19 is smaller than that of the metal ring 2.
0, the load is increased by the elastic wall 18.
Is deformed only in the compression-pulling direction. Therefore, the amount of deformation of the elastic wall 18 at this time is extremely small, and a decrease in the flow rate of the liquid through the orifice 16 due to the deformation of the elastic wall 18 is suppressed to a small value. Therefore, it is possible to effectively reduce large amplitude vibration in a low frequency range with a large damping force (see FIG. 5).

Also, the inner cylinder 11
When vibration in the direction perpendicular to the axis in the high frequency range is input to the upper and lower rubber elastic bodies 13a and 13b and the elastic wall 18
Of the dynamic spring. At this time, since the load in the direction perpendicular to the axis is input to the upper and lower ends of the cylindrical elastic wall 18 from the orifice structure 17 and the annular seal 19, the elastic wall 18 is deformed exclusively in the shearing direction. Become.
Therefore, when vibration in the direction perpendicular to the axis is input, the elastic wall 18
As a result, it is possible to effectively reduce vibration in a high frequency range in the direction perpendicular to the axis with a small dynamic spring as a whole.

As shown in FIG. 5, when the frequency becomes higher than the resonance frequency, the dynamic spring constant in the axial direction increases. However, this liquid-filled anti-vibration mount is applied to the mount of the suspension member. In this case, the increased dynamic spring constant becomes a very small value compared to the dynamic spring constant in the direction perpendicular to the axis. The increase in the dynamic spring constant hardly causes a problem.

In the above, the case where the orifice constituting member 17 is fitted and fixed to the inner cylinder 11 and the annular seal 19 is slidably in close contact with the inner peripheral surface of the outer cylinder 12 has been described. As shown in FIG.
2, the annular seal 19 may be slidably and closely contacted with the outer peripheral surface of the inner cylinder 11.

Next, an embodiment of the present invention will be described with reference to FIGS. The liquid-filled anti-vibration mount of this embodiment has exactly the same configuration as that shown in FIGS. 1 to 4 except for the elastic wall, and therefore has the same configuration as that shown in FIGS. Reference numerals are given, and the description of the overlapping portions will be omitted.

The elastic wall 28 of the liquid-filled anti-vibration mount
Is formed in a cylindrical shape along the axial direction of the inner and outer cylinders 11 and 12, the inner peripheral surface of the upper end thereof is bonded to the outer peripheral surface of the orifice structure 17, and the lower end has an axial thickness. An annular seal 29 as a thick close portion is integrally formed. In the case of the one shown in FIGS.
As a means for increasing the axial rigidity of No. 9, a metal ring 20 is embedded inside the annular seal 19, but in this embodiment, a similar function can be obtained by increasing the axial thickness. ing.

For this reason, in this liquid-filled anti-vibration mount, exactly as shown in FIGS.
When the vibration in the axial direction in the low frequency range is input, the elastic wall 28 is deformed small in the compression and tensile direction, so that the decrease in the flow rate of the liquid in the orifice 16 can be suppressed to a small value. When the vibration in the direction perpendicular to the axis is input, the elastic wall 28 is deformed in the shearing direction to obtain low rigidity. Therefore, even in this liquid-filled anti-vibration mount, the vibration in the low frequency range in the axial direction can be effectively reduced with a large damping force, and the vibration in the high frequency range in the direction perpendicular to the axis can be effectively reduced. It can be effectively reduced with a small dynamic spring. However, in this anti-vibration mount, since the bending rigidity of the annular seal 29 can be increased without embedding the metal ring 20, the manufacture is easier than that shown in FIGS. There is an advantage that manufacturing can be performed at low cost.

Also in this case, as shown in FIG.
The orifice structure 17 may be fitted and fixed to the inner peripheral surface of the outer cylinder 12, and the annular seal 29 may be slidably in close contact with the outer peripheral surface of the inner cylinder 11.

[0023]

As described above, according to the first aspect of the present invention, the elastic wall is formed in a cylindrical shape so as to extend along the axial direction of the inner and outer cylinders, while the close contact portion is an annular elastic body in which a hard ring is embedded. Since the close contact portion is integrally provided at one end of the elastic wall, at the time of inputting the vibration in the axial direction, the deformation at the elastic wall becomes the compression-pulling direction, and the amount of deformation of the elastic wall is reduced. When vibration in the direction perpendicular to the axis is input, the deformation in the elastic wall becomes deformation in the shear direction, and low rigidity is obtained. As a result, vibration in the low frequency range in the axial direction and high frequency range in the direction perpendicular to the axis are obtained. Can be effectively reduced.

According to a second aspect of the present invention, while the elastic wall is formed in a cylindrical shape along the axial direction of the inner and outer cylinders, the close contact portion is formed by an annular elastic body having a thick axial direction. Since the close contact portion is integrally provided at one end of the elastic wall, deformation is caused in the compression tension direction when inputting vibration in the axial direction, and in the shearing direction when inputting vibration in the direction perpendicular to the axis, as a result. Similarly, it is possible to effectively reduce both the vibration in the low frequency range in the axial direction and the vibration in the high frequency range in the direction perpendicular to the axis.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the invention of claim 1;

FIG. 2 is a plan view showing the embodiment.

FIG. 3 is an exemplary sectional view taken along the line AA of FIG. 2 showing the embodiment;

FIG. 4 is a rear view showing the embodiment.

FIG. 5 is a graph showing frequency characteristics of a dynamic spring constant and a damping coefficient according to the embodiment.

FIG. 6 is a sectional view showing another embodiment of the invention of claim 1;

FIG. 7 is a sectional view showing an embodiment of the invention of claim 2;

FIG. 8 is an enlarged view of a portion B in FIG. 7;

FIG. 9 is a sectional view showing another embodiment of the invention of claim 2;

FIG. 10 is a sectional view showing a conventional technique.

[Explanation of symbols]

11: inner cylinder, 12: outer cylinder, 13a, 13b: rubber elastic body, 14: liquid chamber, 15: partition member, 16: annular orifice, 18, 28: elastic wall, 19, 29: annular seal (close contact part) , 20 ... metal ring (hard ring).

Claims (2)

[Claims] An inner cylinder and an outer cylinder arranged concentrically are connected to each other at both ends by an elastic body, and a space surrounded by the inner and outer cylinders and the elastic body is a liquid chamber. The liquid chamber is divided into two chambers by a partition member having one end fixed to one of the inner and outer cylinders and the other end slidably in close contact with the other cylinder. A liquid-filled anti-vibration mount provided with an orifice communicating with the chamber, wherein a portion of the partition member near a close contact portion with one of the other cylinders is configured by an elastic wall; , While being formed in a cylindrical shape along the axial direction of the inner and outer cylinders, the close contact portion is constituted by an annular elastic body in which a hard ring is embedded, and the close contact portion is integrally provided at one end of the elastic wall. Liquid-filled anti-vibration mount . 2. An inner cylinder and an outer cylinder which are arranged concentrically are connected to each other at both ends by an elastic body, and a space surrounded by the inner and outer cylinders and the elastic body forms a liquid chamber. The liquid chamber is divided into two chambers by a partition member having one end fixed to one of the inner and outer cylinders and the other end slidably in close contact with the other cylinder. A liquid-filled anti-vibration mount provided with an orifice communicating with the chamber, wherein a portion of the partition member near a close contact portion with one of the other cylinders is configured by an elastic wall; , While forming the cylindrical portion along the axial direction of the inner and outer cylinders, the close contact portion is formed by an annular elastic body having a thick axial thickness, and the close contact portion is integrally formed at one end of the elastic wall. Liquid-filled anti-vibration mount characterized by being provided