JP3300446B2 - Liquid filled type vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device mounted on a vehicle such as an automobile or a general industrial machine for absorbing vibration.

[0002]

2. Description of the Related Art There has been proposed a liquid filled type vibration damping device capable of effectively absorbing vibrations having different frequencies in accordance with the respective vibrations (JP-A-4-60233).

[0003] As shown in FIGS. 8 and 9, a main rubber 106 is provided between an inner cylinder 102 and an outer cylinder 104 in the vibration isolator 100. A chamber 107 is formed.

The liquid chamber 107 is divided into a pressure receiving liquid chamber 108, a first sub liquid chamber 112, and a second sub liquid chamber 116 by a partition member 118 and a thick rubber 120.
Is connected to the first sub-liquid chamber 112 via a first restriction passage 110 surrounding the inner cylinder 102, and is rotated around the inner cylinder 102 and has a larger cross-sectional area than the first restriction passage 110. The second auxiliary liquid chamber 11 through the second restriction passage 114
It is communicated with 6.

[0005] The vibration isolator 100 is provided with a low-frequency, large-amplitude shake vibration (for example, a frequency of 10 Hz and an amplitude of ± 1
mm), the filled liquid flows through the first restriction passage 110 to the pressure receiving liquid chamber 108 and the first sub liquid chamber 11.
2, a large damping force is generated in the vibration isolator 100 due to the passage resistance of the first restriction passage 110 and the liquid column resonance.

In addition, for example, idle vibration having a relatively high frequency and small amplitude (for example, a frequency of 20 to 30 Hz, an amplitude of ± 0.3
mm), the first restriction passage 110 is clogged, but the filled liquid flows between the pressure receiving liquid chamber 108 and the second sub liquid chamber 116 via the second restriction passage 114. And the liquid resonates in the second restriction passage 114 in the liquid column, and the dynamic spring constant of the vibration isolator 100 is reduced.

[0007]

The thick rubber 1
Numeral 20 is vulcanized and bonded to the elastic holder 122 as shown in FIG. A circular hole 124 is formed in the elastic body holder 122, and the protrusion 12 formed in the partition member 118 is formed.
6 is inserted into the circular hole 124 and its tip is crushed, whereby the elastic body holder 122 is caulked and fixed to the partition member 118.

[0008] For this reason, when the caulking force varies, a gap may be formed at the overlapping portion of the elastic body holding member 122 and the partition member 118. That is, if the space between the first sub liquid chamber 112 and the second sub liquid chamber 116 is not completely sealed, the first restriction passage 110 and the second restriction passage 114
When the volume of liquid flowing back and forth decreases,
As a result, the damping force (tan δ) decreases, and at the time of high-frequency small-amplitude vibration, the peak of the liquid column resonance decreases and the dynamic spring constant cannot be sufficiently reduced. No longer possible (see FIG. 11).

The present invention has been made in view of the above circumstances, and has as its object to provide a liquid-filled type vibration damping device that can reliably seal a sub-liquid chamber and reliably absorb vibrations having different frequencies.

[0010]

A liquid filled type vibration damping device according to the present invention is connected to an outer cylinder connected to one of a vibration generator and a vibration receiver, and connected to the other of the vibration generator and the vibration receiver. An inner cylinder, an elastic body provided between the outer cylinder and the inner cylinder, which is deformed when vibration is generated, a recess formed in the elastic body, and a partition member for closing the recess to form a pressure-receiving liquid chamber A first diaphragm fixed to the outer cylinder and facing a space formed between the partition member and the outer cylinder; and a first diaphragm fixed to the partition member and facing the space to the first diaphragm. A second sub-liquid chamber that is divided into a first sub-liquid chamber and a second sub-liquid chamber that does not face the first diaphragm, and has a higher rigidity than the first diaphragm; A first restricting passage connecting the sub-liquid chamber and the pressure-receiving liquid chamber to each other; And a second restricting passage which is liquid-column resonance frequency is set higher than connecting the the liquid chamber said pressure receiving liquid chamber said first restricting passage, the first restricting passage, the front
The recess is along the inner peripheral surface of the outer cylinder on the opposite side of the inner cylinder.
Formed, the partition member and the second diamond
The extension formed by the passage forming wall formed integrally with the flam
And a long part.

[0011]

According to the liquid-filled type vibration damping device of the present invention, one of the inner cylinder and the outer cylinder is connected to the vibration generating section, and the other is connected to the vibration receiving section for use.

When vibration is input to the liquid-filled type vibration damping device, the elastic body is deformed, and the vibration is absorbed by resistance based on internal friction of the elastic body.

When the input vibration is at a low frequency, the first diaphragm is deformed due to a change in the pressure of the pressure receiving liquid chamber, and the second diaphragm having a higher rigidity than the first diaphragm is almost deformed. Never. Therefore,
At the time of low frequency vibration, the liquid moves between the pressure receiving liquid chamber and the first sub liquid chamber via the first restriction passage, and the liquid sealing type protection is provided by the passage resistance of the first restriction passage and the liquid column resonance. A large damping force is generated in the vibration device, and low-frequency vibration is absorbed. The first restriction passage is located on the opposite side of the inner cylinder from the recess.
A portion formed along the inner peripheral surface of the outer cylinder; a partition member;
Formed with a passage-forming wall formed integrally with the diaphragm
With a long passageway
Therefore, a large damping force can be obtained.

On the other hand, when the input vibration is at a high frequency, the first restriction passage is clogged, but in this case, the second diaphragm is deformed, and the liquid passes through the second restriction passage. Between the pressure-receiving liquid chamber and the second sub-liquid chamber through the second sub-liquid chamber, the liquid column resonates in the second restriction passage, and the dynamic spring constant of the liquid filled type vibration damping device is reduced to absorb high frequency vibration. You.

Further, the liquid filled type vibration damping device of the present invention is
Since the second diaphragm that partitions the first sub liquid chamber and the second sub liquid chamber is fixed to the partition member, the liquid moves between the first sub liquid chamber and the second sub liquid chamber. I will not do it.

Therefore, at the time of low-frequency vibration, the same amount of liquid as the change in the volume of the pressure-receiving liquid chamber can flow through the first restriction passage reliably, and at the time of high-frequency vibration in which the first restriction passage is clogged, Since the second diaphragm having high rigidity is deformed by the pressure change of the pressure receiving liquid chamber and generates a large pumping force, it is possible to surely cause the liquid column resonance in the second restriction passage.

[0017]

EXAMPLES [Comparative Example] Before describing the present invention, a liquid-filled type vibration damper according to a comparative example is described.
The device 10 will be described with reference to FIGS.

As shown in FIG. 1, in the liquid filled type vibration damping device 10, the inner cylinder 12 and the outer cylinder 14 are arranged in the same axial direction. An intermediate cylinder 16 is inserted between the inner cylinder 12 and the outer cylinder 14 coaxially with the outer cylinder 14.

As shown in FIG. 2 and FIG.
6, large-diameter portions 16A are formed at both ends in the axial direction.
A thin-film rubber 14A vulcanized and bonded to the inner peripheral surface of the outer cylinder 14.
To improve the sealing performance. Both ends in the axial direction of the outer cylinder 14 are reduced in diameter and caulked, so that the intermediate cylinder 16 is formed.
Is fixed to

As shown in FIG. 3, a main rubber 26 as an elastic body is disposed between the inner cylinder 12 and the intermediate cylinder 16, and the main rubber 26 is applied to the inner cylinder 12 and the intermediate cylinder 16, respectively. Sulfur adhesive.

The outer cylinder 14 has a through hole 14B (see FIG. 1). In addition, the thin film rubber 14A is not vulcanized and bonded to a portion corresponding to the through hole 14B of the outer cylinder 14, and is a first diaphragm 24 that protrudes toward the inner cylinder 12.

Thus, an air chamber 25 is formed by the outer cylinder 14 and the first diaphragm 24, and the air chamber 25 is communicated with the outside air by the through hole 14B.

A void 28 is formed in the main rubber 26 so as to penetrate in the axial direction of the liquid filled vibration isolator 10.

On the opposite side of the gap 28 with the inner cylinder 12 therebetween, there is formed a recess 26A in which the main rubber 26 is largely cut in the direction of the inner cylinder 12, and this recess 26A, the first diaphragm 24 and the thin film A liquid chamber 29 filled with a liquid such as water or oil is formed by the rubber 14A. In the liquid chamber 29, a partition member 34 for dividing the liquid chamber 29 into a plurality of small liquid chambers is provided.

As shown in FIG. 4, a pair of substantially semicircular side plate portions 34A are formed on the partition member 34 so as to face each other. A rectangular top plate portion 34B is formed continuously from 34A. Further, a bent flange portion 34C is continuously formed at an edge portion of the side plate portion 34A and the top plate portion 34B, and the cross section along the axis of the partition member 34 has a substantially hat shape (see FIG. 3).

A thick second diaphragm 44 made of rubber is provided inside the partition member 34.

The second diaphragm 44 has a rectangular deforming portion 44 disposed in parallel with the top plate portion 34B at a predetermined distance from the top plate portion 34B.
A, and the direction along the longitudinal direction (direction of arrow A) of the top plate portion 34B is the longitudinal direction. Deformation part 44
A includes a first wall portion 44B rising from one end in the width direction toward the top plate portion 34B and a second wall portion 44C rising from one end in the longitudinal direction toward the top plate portion 34B.
Are provided integrally. The end faces of the deformed portion 44A, the first wall portion 44B, and the second wall portion 44C (FIG.
The shaded portion) is vulcanized and bonded to the inner peripheral surface of the partition member 34.

The end of the first wall 44B opposite to the second wall 44C is extended to the upper end of the partition member 34. The extension of the first wall 44B is The end surface on the side of the concave portion 34D is vulcanized and bonded to the concave portion 34D. Therefore, the longitudinal direction (the direction of the arrow B and the direction opposite to the direction of the arrow B) of the concave portion 34D is divided into two by the extension of the first wall surface portion 44B.

As shown in FIG. 1 and FIG.
Except for the outer peripheral surface of the flange portion 34C except for the outer cylinder 14 side (see FIG. 4), the deformed portion 44A of the second diaphragm 44, and the extended end portion of the first wall surface portion 44B, the end surface on the opposite side to the arrow A direction is the outer cylinder 14 is in close contact with the thin film rubber 14A. Therefore, the liquid chamber 29 includes the pressure-receiving liquid chamber 30 formed between the concave portion 26 </ b> A of the main rubber 26 and the partition member 34, and the partition member 34.
And a second sub-liquid chamber 50 and a partition member 34 formed between the second diaphragm 44 and the second diaphragm 44, and a first sub-liquid chamber 46 formed between the second diaphragm 44 and the outer cylinder 14. You.

The second diaphragm 44 is connected to the outer cylinder 14.
The rigidity with respect to the liquid pressure is set higher than that of the diaphragm 24.

As shown in FIG. 3, a small diameter portion 16B is formed at an intermediate portion in the axial direction of the intermediate cylinder 16. The small-diameter portion 16B has a large-diameter portion 16 on the side opposite to the arrow B direction.
A at the corner with the large-diameter portion 16A in the direction of the arrow B is a restriction passage forming rubber 18B.
Are vulcanized and adhered. The small diameter portion 16B has a partition rubber 1 nearer to the restricted passage forming rubber 18B than the central portion in the axial direction.
8C is vulcanized and adhered. These restricted passage forming rubbers 1
A wide groove 18D and a narrow groove 18E are formed by 8A, 18B and the partition rubber 18C with the direction around the axis of the intermediate cylinder 16 as the longitudinal direction.

As shown in FIG. 3, the large diameter portion 1 of the intermediate cylinder 16
6A, restricted passage forming rubbers 18A, 18B and partition rubber 1
8C is pressed against the thin film rubber 14A.

Therefore, the space surrounded by the groove 18E and the outer cylinder 14 is the first restriction passage 22 for absorbing low-frequency vibration such as shake vibration, and the wide groove 18D and the outer cylinder 1 are formed.
The space defined by the first and second passages 4 is a second restriction passage 20 for absorbing high-frequency vibration such as idle vibration.

Both ends of the first restriction passage 22 and the second restriction passage 20 in the direction of arrow A are connected to the pressure receiving liquid chamber 30.
The end of the first restriction passage 22 in the direction opposite to the arrow A side is a concave portion 3 of the partition member 34.
The first sub-liquid chamber 46 is communicated via the 4D (see FIGS. 2 and 5).
2), the end of the second restriction passage 50 in the direction opposite to the arrow A side communicates with the second auxiliary liquid chamber 50 via the concave portion 34D of the partition member 34 (see FIGS. 1 and 5). .

As shown in FIG. 2, a restraining plate 52 having a substantially arc-shaped cross section is embedded in the main rubber 26 so as to go around the pressure receiving liquid chamber 30, so that the rigidity of the main rubber 26 is increased to reduce the amount of deformation. Has restricted.

Next, the operation of this comparative example will be described. First, an assembling procedure of the liquid-filled type vibration damping device 10 will be described.

First, the integrated main rubber 26, inner cylinder 12 and intermediate cylinder 16 are arranged in the liquid, and the partition member 34 is assembled in the concave portion 26A of the main rubber 26.

Then, the main rubber 26, the inner cylinder 12, and the intermediate cylinder 16 to which the partition member 34 is assembled are inserted into the outer cylinder 14,
The outer cylinder 14 is reduced in diameter by a predetermined dimension, and both ends in the axial direction are bent inward and caulked. Thus, the assembly of the liquid-sealed type vibration damping device 10 is completed.

When the liquid-filled type vibration damping device 10 manufactured by the above procedure is mounted on an automobile as an engine mount of the automobile, as an example, the outer cylinder 14 is connected to the vehicle body via a bracket (not shown), 12 is fixed to the engine via a connecting rod (not shown). Thereby, the inner cylinder 12 on which the engine's own weight acts deforms the main rubber 26 elastically, moves to the partition member 34 side from the state of FIG. 1, and the inner cylinder 12 and the outer cylinder 14 are arranged substantially coaxially. . Conversely, the body of the automobile is transferred to the inner cylinder 12 and the outer cylinder 1
4 may be connected to an engine.

When the vibration of the engine is a low frequency and large amplitude such as a shake vibration (for example, a frequency of 10 Hz and an amplitude of about ± 1 mm), the first diaphragm 24 having low rigidity is deformed. It moves between the pressure receiving liquid chamber 30 and the first sub liquid chamber 46 through the first restriction passage 22. In this case, the second diaphragm 44 having high rigidity hardly deforms. Therefore, the liquid receives the passage resistance in the first restriction passage 22 having a small cross-sectional area, and the liquid-filled vibration damping device 10 can obtain a high damping force.

The vibration of the engine is, for example, an idle vibration (for example, a frequency of 20 to 30 Hz, an amplitude of ± 0.3 m).
m), the first restriction passage 22 having a small cross-sectional area is clogged. At this time, the second diaphragm 44 is deformed, a liquid column resonance occurs in the second restriction passage 20, the dynamic spring constant of the liquid filled type vibration damping device 10 is reduced, and high frequency vibration such as idle vibration is absorbed.

Here, the liquid filled type vibration damping device 1 of this comparative example
At 0, since the second diaphragm 44 is vulcanized and bonded to the partition wall member 34 to be integrated, the liquid in the first sub liquid chamber 46 leaks to the second sub liquid chamber 50 side, or the second sub liquid chamber 50 The liquid does not leak to the first sub liquid chamber 46 side. Therefore, unlike the conventional vibration isolator, the amount of liquid flowing through the first restriction passage 22 and the second restriction passage 20 does not decrease due to insufficient sealing of the liquid chamber. In the case of large amplitude vibration, the passage resistance of the first restriction passage 22 can be sufficiently received, and in the case of high frequency small amplitude vibration, liquid column resonance can be effectively performed in the second restriction passage 20.

As described above, the liquid-filled type vibration damping device of this comparative example
In the device 10, the second diaphragm 44 is vulcanized and bonded to the partition member 34, so that there is no possibility of causing a gap between the partition member and the diaphragm as in a conventional vibration isolator of this type. In addition, there is no problem that the anti-vibration characteristics are reduced or the anti-vibration characteristics vary among products.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 6 and 7.
I do. The same components as those of the comparative example are denoted by the same reference numerals.
The description is omitted.

In the liquid filled type vibration damping device 10 of the present embodiment shown in FIGS. 6 and 7, the structure of the first restriction passage 22 is a comparative example.
Is different.

As shown in FIG. 6, at the lower end of the first wall portion 44B, a passage forming wall 54 extending in a direction away from the deformed portion 44A (direction of arrow B) is integrally provided.
The distal end surface of the passage forming wall 54 is vulcanized and bonded to the side plate portion 34A.

Further, as shown in FIG.
4 is opposite to the direction of arrow A in FIG.
It is in close contact with 4A. Therefore, the first wall portion 44
The space surrounded by B, the passage forming wall 54, and the top plate 34B is an extension of the first restriction passage 22. Therefore, the liquid-filled vibration damping device 10 of the present embodiment, the ratio of liquid
Since it receives a larger passage resistance than the liquid-sealed type vibration damping device 10 of the comparative example, it is possible to obtain a larger damping force than the liquid-sealed type vibration damping device 10 of the comparative example .

Although not shown, a reinforcing member such as a metal plate is embedded in the passage forming wall 54 and the first wall portion 44B,
The passage cross section may not be deformed by the hydraulic pressure.

Other configurations and operations are the same as those of the comparative example.
It is. In the above embodiment , the liquid filled type vibration damping device 10
Is used as an engine mount. However, the present invention is not limited to this, and the liquid filled type vibration damping device 10 may be used for a cab mount, a body mount, a general industrial machine, and the like.

[0050]

As described above, in the vibration isolator according to the present invention, the second diaphragm is fixed to the partition wall member, and the first sub-liquid chamber and the second sub-liquid chamber are securely sealed. Has an excellent effect that vibrations different from each other can be reliably absorbed. Also, the first restriction passage is longer than before.
As a result, a large damping force can be obtained.

[Brief description of the drawings]

FIG. 1 shows a vibration isolator according to a comparative example , and is a cross-sectional view taken along line 1-1 of FIG.

FIG. 2 is an exploded perspective view showing a vibration isolator according to a comparative example .

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1, illustrating the vibration isolator according to the comparative example .

FIG. 4 is an exploded perspective view of a partition member and a second diaphragm of the vibration isolator according to the comparative example .

5 shows a vibration isolator according to a comparative example , and is a cross-sectional view taken along line 5-5 in FIG.

FIG. 6 is a sectional view taken along line 6-6 of FIG. 7, illustrating the vibration isolator according to the embodiment of the present invention .

FIG. 7 is a cross-sectional view taken along the line 7-7 in FIG. 6, showing the vibration isolator according to the embodiment of the present invention .

FIG. 8 is a sectional view taken along line 8-8 of FIG. 9, showing a conventional vibration isolator.

FIG. 9 is a sectional view taken along line 9-9 of FIG. 8, showing the conventional vibration isolator.

FIG. 10 is an exploded perspective view showing a thick rubber, an elastic body holder, and a partition member of a conventional vibration isolator.

FIG. 11 is a graph showing a difference in vibration damping characteristics (damping force, dynamic spring constant) when there is a gap in the sub liquid chamber and when there is no gap.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 liquid-enclosed type vibration damping device 12 inner cylinder 14 outer cylinder 20 second restricted passage 22 first restricted passage 24 first diaphragm (first diaphragm) 26 main body rubber (elastic body) 26A concave portion 29 liquid chamber (space section) 30) Pressure receiving liquid chamber 34 Partition member 46 First sub liquid chamber (first sub liquid chamber) 44 Second diaphragm (second diaphragm) 50 Second sub liquid chamber (second sub liquid chamber) 54 Passage forming wall

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-60233 (JP, A) JP-A-5-10378 (JP, A) JP-A-6-2734 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F16F 13/14

Claims (1)

(57) [Claims] An outer cylinder connected to one of the vibration generator and the vibration receiver; an inner cylinder connected to the other of the vibration generator and the vibration receiver; and between the outer cylinder and the inner cylinder. An elastic body that is provided and deforms when vibration is generated; a concave portion formed in the elastic body; a partition member that closes the concave portion to form a pressure-receiving liquid chamber; a partition member fixed to the outer cylinder and the outer cylinder. A first diaphragm facing the space formed between the first and second diaphragms; a first auxiliary liquid chamber fixed to the partition member and facing the first diaphragm with the space facing the first diaphragm; and a first diaphragm facing the first diaphragm. A second diaphragm, which is divided into a second sub-liquid chamber that is not to be used, and has a higher rigidity than the first diaphragm, and a first diaphragm that connects the first sub-liquid chamber and the pressure-receiving liquid chamber. Connecting the second sub-liquid chamber and the pressure-receiving liquid chamber to the first passage. Includes a second restricting passage which is liquid-column resonance frequency than limited passage is set higher, the said first restricted passage, the said recess across said inner cylinder
A portion formed along the inner peripheral surface of the outer cylinder on the opposite side;
A wall formed integrally with the wall member and the second diaphragm.
Road forming wall and an extension formed by
That the liquid-filled vibration damping device, characterized in that.