JP3528872B2 - Liquid-filled mount - 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 mount used for supporting a vibration body such as an automobile engine in a vibration-proof manner.

[0002]

2. Description of the Related Art As disclosed in, for example, Japanese Patent Application Laid-Open No. 60-132144, a liquid-filled mount has conventionally been provided with an orifice for absorbing and suppressing low frequency vibration and an absorbing and suppressing high frequency vibration. Is provided separately. However, according to this liquid-filled mount, since the space for setting the flow path length of the latter, which is equipped with a sub-diaphragm and suppresses the absorption of high-frequency vibrations, is small, the resonance frequency tuning range is caused by this. There is a limited problem. In addition, according to this conventional liquid-filled mount, the parts made of rubber-like elastic material include one elastic body, two diaphragms,
Since one sub-diaphragm and a total of four sub-diaphragms are required, it is troublesome to manufacture them and the product cost is high.

[0003]

In view of the above points, the present invention makes it possible to set the flow path length of an orifice provided with a sub-diaphragm to suppress the absorption of high-frequency vibrations longer than before, and thus the resonance frequency. It is an object of the present invention to provide a liquid-filled mount capable of widening the tuning range of. In addition to this, it is possible to reduce the number of parts of the rubber-like elastic material as compared with the conventional one, and thus to provide a liquid-filled mount that can be easily manufactured and the product cost can be reduced. And

[0004]

In order to achieve the above object, in a liquid-filled mount according to claim 1 of the present invention, one mounting portion and the other mounting portion are provided with an elastic body made of a rubber-like elastic material. And the diaphragm is connected to the other mounting portion, and the airtight chamber surrounded by the one mounting portion, the elastic body, the other mounting portion and the diaphragm is connected by the partition portion connected to the other mounting portion. A liquid-filled type in which the first liquid chamber on the mounting portion side and the second liquid chamber on the diaphragm side are partitioned, and a first orifice for suppressing low-frequency vibration is provided in the partition portion, and the working liquid is sealed in the airtight chamber. In the mount, a partition part connected to the other mounting part is provided on the outer peripheral side of the first liquid chamber, and a hole formed at one place in the partition part is closed.
Sub diaphragm formed of a rubber film, on the outer peripheral side of the partition wall, and to providing an absorption suppressing second orifice high frequency vibrations comprises the sub-diaphragm. The liquid-filled mount according to claim 2 of the present invention is the liquid-filled mount according to claim 1, wherein the sub-diaphragm is elastic.
I decided to mold it with the body .

[0005]

In the liquid-filled mount according to claim 1 of the present invention having the above-mentioned structure, the second orifice having the sub-diaphragm for suppressing high-frequency vibration is provided on the partition wall provided on the outer peripheral side of the first liquid chamber. Since the second orifice is provided further on the outer peripheral side, it is possible to set the second orifice in an annular shape at least at a part thereof, thereby setting the flow path length of the second orifice longer than in the conventional case. It becomes possible. In addition, the sub diaphragm is the partition wall.
Formed by a rubber film that closes a hole made in one part in the part (19)
Since it is formed and faces the first liquid chamber, high frequency vibration is input
The sub-diaphragm can also resonate when
Becomes Furthermore, in the liquid-filled mount according to claim 2, in addition to this, the sub-diaphragm is an elastic body.
Since they are integrally molded, the number of rubber-like elastic material parts can be reduced as compared with the conventional case.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

First Embodiment: As shown in FIG. 1, one mounting portion 1 provided with a center boss 2 and a mounting bolt 3.
And the first to third cases 5, 6, 7 and cup 8
The other mounting portion 4 provided with is an elastic body 9 made of a rubber-like elastic material.
A diaphragm 10 made of a rubber-like elastic material is connected to the other mounting portion 4 with its outer peripheral edge portion 10a, and an airtight chamber 11 is provided inside the mount surrounded by these. The airtight chamber 11 is provided with the first and second orifice members 13, 14 and is connected to the other mounting portion 4 by the partitioning portion 12. One mounting portion 1 side (upper side) first liquid chamber 15 and diaphragm 10 side. A first orifice (also referred to as a shock orifice) that is partitioned by the (lower) second liquid chamber 16 and that suppresses low-frequency vibrations in the partition section 12
17 is provided, and the hydraulic fluid 18 is sealed in the airtight chamber 11. Further, on the outer peripheral side of the first liquid chamber 15, an annular partition wall portion 19 formed by the cylindrical portion 5a of the first case 5 is provided, and on the outer peripheral side of this partition wall portion 19, a sub-member made of a rubber-like elastic material is provided. A second orifice (also called an idle orifice) that has a diaphragm 21 and suppresses high-frequency vibration absorption
20 is provided from the first liquid chamber 15 toward the second liquid chamber 16.

The center boss 2 is made of cast iron, the first case 5 is made of sheet metal, and the center boss 2 and the first case 5 are used as outsert parts or insert parts to vulcanize the elastic body 9 made of a rubber-like elastic material. It is molded. The cylindrical portion 5a of the first case 5 forming the above-mentioned partition wall portion 19 is preliminarily formed with a hole 5b at one location, and when the elastic body 9 is molded, the hole 5b is partially filled with a rubber material. A rubber film for closing the hole 5b is provided, and the rubber film forms a sub-diaphragm 21 made of a rubber-like elastic material. Therefore, the sub-diaphragm 21 is formed integrally with the elastic body 9. Outer peripheral flange portion 5c of first case 5 protruding outside elastic body 9, first orifice member 1
3, the outer peripheral cylindrical portion 13a, the outer peripheral edge portion 10 of the diaphragm 10
The reinforcing ring 22, the outer peripheral flange portion 8a of the cup 8 and the flange portion 7a of the third case 7 which are buried in a are closely overlapped as shown in the figure, and these sheet metal members are collectively assembled into a second case made of sheet metal. It is fixed by crimping by 6. Further, a stopper member 24 made of sheet metal is fixed to the upper surface of the center boss 2, and the stopper 23 is formed by combining the stopper member 24 and a stopper portion 6a provided by extending a part of the second case 6 upward. It is provided. This stopper 23 limits the relative amount of vertical displacement between the one mounting portion 1 and the other mounting portion 4 to a certain amount, and prevents the elastic body 9 from being excessively elastically deformed. The stopper member 24 is provided with a buffer portion 25 made of a rubber-like elastic material. Further, the cup 8 is provided with a required number of ventilation holes 26.

The first orifice 17 for suppressing the low-frequency vibration is formed in a spiral shape by the combination of the first and second orifice members 13 and 14, that is, from the first liquid chamber 15 to the portions A and B. It is provided so as to reach the second liquid chamber 16 by sequentially spiraling through the section C and the section C. Further, the second orifice 20 for suppressing the high frequency vibration is provided so as to reach from the first liquid chamber 15 to the second liquid chamber 16 through the following path unless the sub diaphragm 21 is provided. Because of the presence of both liquid chambers 15,
The 16 are not communicated with each other, and the high frequency vibration is absorbed and suppressed by the liquid column resonance in the flow path and the resonance of the sub diaphragm 21. First liquid chamber 15 → hole 5b provided in partition wall portion 19 (cylindrical portion 5a of first case 5) → annular flow provided between partition wall portion 19 and inner peripheral upper cylinder portion 13b of first orifice member 13 Passage 27 → Communication hole 13c provided in inner peripheral upper cylinder portion 13b of first orifice member 13 → Flow passage 28 provided between first orifice member 13 and diaphragm 10 →
A communication hole 13e provided in the inner lower cylinder portion 13d of the first orifice member 13 → the second liquid chamber 16.

The liquid-filled mount having the above structure is
For example, one of the one mounting portion 1 and the other mounting portion 4 is mounted on the vehicle body side of the automobile and the other mounting portion is mounted on the engine side to support the engine in a vibration-proof manner, and low-frequency vibration is input. In this case, the working fluid 18 flows from one of the first liquid chamber 15 and the second liquid chamber 16 to the other through the first orifice 17, and the low frequency vibration is effectively absorbed and suppressed by the flow resistance generated at that time. . Further, when high frequency vibration is input, the liquid column resonance in the second orifice 20 and the sub diaphragm 2
The resonance of 1 effectively absorbs and suppresses this high frequency vibration,
Moreover, the second orifice 20 is provided further on the outer peripheral side of the partition wall portion 19 provided on the outer peripheral side of the first liquid chamber 15,
Since a part of the second orifice 20 is provided in an annular shape, the flow path length of the second orifice 20 is set longer than that of the conventional one. Therefore, the tuning range of the resonance frequency can be made wider than before, and a mount product having a wide range of use (corresponding range) can be provided. In addition to this, the sub-diaphragm 21 is formed integrally with the elastic body 9, so that the number of parts of the rubber-like elastic material part is two points from the conventional four points (one elastic body 9 in which the sub-diaphragm 21 is integrally formed). Since the diaphragm 10 and the buffer 25 are not included in the comparison, the manufacturing cost can be reduced while facilitating the manufacturing.

[0011]

[0012]

[0013]

[0014]

[0015]

The present invention has the following effects.

That is, first, in the liquid-filled mount according to claim 1 of the present invention having the above-described structure, the second orifice having the sub-diaphragm for suppressing high-frequency vibration is provided on the outer peripheral side of the first liquid chamber. Since the second orifice is provided on the outer peripheral side of the partition wall provided, it is possible to set the second orifice in an annular shape at least at a part thereof. It is possible to set it longer. Therefore,
As a result, the tuning range of the resonance frequency can be made wider than before, and it is possible to provide a mount product with a wide usage range (corresponding range). Also, the subdiaphragm
A hole closes a hole formed in the partition wall (19) at one place.
Since it is formed of a rubber film facing the first liquid chamber,
When the wave vibration is input, the sub diaphragm also resonates.
It is possible to Therefore, the second orifice
Since the sub-diaphragm resonates with the liquid column resonance,
It is possible to effectively absorb and suppress frequency vibration. Furthermore, in the liquid-filled mount according to claim 2, in addition to this, since the sub-diaphragm is formed integrally with the elastic body, it is possible to reduce the number of parts of the rubber-like elastic material part as compared with the conventional one. Becomes Therefore, this can facilitate the manufacture and reduce the product cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid-filled mount according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a liquid-filled mount according to a second embodiment of the present invention.

[Explanation of symbols]

1 One mounting part 2 Center boss 3 mounting bolts 4 Other mounting part 5 First case 5a cylindrical part 5b, 22a holes 5c, 8a Outer peripheral flange 6 second case 6a Stopper part 7 Third case 7a Flange part 8 cups 9 elastic body 10 diaphragm 11 airtight chamber 12 partition 13 First orifice member 13a Outer cylindrical portion 13b Inner peripheral upper cylinder part 13c, 13e communication hole 13d inner lower cylinder part 14 Second orifice member 15 First liquid chamber 16 Second liquid chamber 17 First Orifice 18 hydraulic fluid 19 Partition 20 Second orifice 21 Sub diaphragm 22 Reinforcement ring 23 Stopper 24 Stopper member 25 buffer 26 Vents 27 Circular flow path 28 channels 29 Third liquid chamber

Claims (2)

(57) [Claims] 1. One mounting portion (1) and the other mounting portion (4) are connected via an elastic body (9) made of a rubber-like elastic material, and a diaphragm () is attached to the other mounting portion (4). 10), and the airtight chamber (11) surrounded by the one mounting portion (1), the elastic body (9), the other mounting portion (4) and the diaphragm (10) is connected to the other mounting portion (1). By the partitioning part (12) connected to 4), the first liquid chamber (15) on the one mounting part (1) side and the second liquid chamber (16) on the diaphragm (10) side.
And a first orifice (17) for suppressing the absorption of low frequency vibrations is provided in the partition part (12), and the airtight chamber (1
In the liquid-sealed mounting encapsulating hydraulic fluid (18) to 1), the other mounting portion on the outer peripheral side (4) connected to the partition wall (19) provided in said first fluid chamber (15), wherein Interval
With a rubber film that closes a hole made in one place in the wall (19)
Sub diaphragm (21) is formed and the partition wall (19) is formed.
On the outer peripheral side of a liquid-sealed mounting, characterized in that a absorption suppressing second orifice high-frequency vibrations (20) provided with the sub-diaphragm (21). 2. A vibration-proof mount according to claim 1, wherein the sub-diaphragm (21) is formed integrally with the elastic body (9) .