JP3507928B2 - 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 capable of obtaining a vibration-damping effect based on the flow of a liquid (fluid) sealed inside. The present invention relates to a liquid-filled type vibration damping device in which liquid chambers and the like to be enclosed are simply formed with a small number of parts and these liquid chambers and the like are installed in parallel.

[0002]

2. Description of the Related Art Among vibration isolation devices, particularly in engine mounts for automobiles, an engine, which is a power source, is operated under various conditions from idling to the maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. In general, a vibration damping device as an engine mount is intended to block idling vibrations that target torque fluctuations caused by explosive combustion of an engine or shakes that target resonance phenomena between an engine and an engine mount. The system settings (tuning) have been made.
However, in order to prevent (violate) these vibrations, it is difficult to avoid the resonance phenomenon by selecting the spring constant, and it is difficult to avoid the resonance phenomenon. Therefore, by increasing the damping coefficient, It may be considered that vibration transmission to the vehicle body side is cut off. In order to correspond to these multiple conditions, two liquid chambers are provided inside and an orifice is connected between them.
So-called liquid-filled engine mount (anti-vibration device)
Has already been devised, for example, Japanese Patent Publication No. 3-573.
It is known from Japanese Patent Publication No. 39 and the like.

[0003]

By the way, the above-mentioned conventional one has a partition plate for partitioning the main chamber and the sub chamber in which the liquid is sealed, and an orifice for flowing the liquid between the main chamber and the sub chamber. It is composed of a plurality of members such as a member to be formed and a diaphragm for partitioning the sub chamber from the air chamber. That is, many components are required to form the liquid-filled type vibration damping device. A liquid-filled type vibration damping device is formed by assembling components made up of many of these components. Further, since the liquid is sealed in the main chamber and the sub chamber, the assembling work of the partition plate, the diaphragm, etc. does not allow bubbles (air) to enter in the container filled with the liquid. There is a problem that it must be performed in such a state. Therefore, in order to solve such a problem, it is an object of the present invention to provide a compact liquid-filled type vibration damping device having a small number of parts and taking up no space in the vertical direction. ).

[0004]

In order to solve the above-mentioned problems, the following measures are taken in the present invention. That is, a connecting fitting attached to the vibrating body side,
A holder attached to a member on the vehicle body side, an insulator that acts between the connecting fitting and the holder and blocks vibrations from the vibrating body, and an incompressible fluid (continuously provided on the insulator). liquid)
Regarding a liquid-filled type vibration damping device consisting of a main chamber and a sub-chamber, etc., in which a cylindrical skirt portion is provided continuously to the insulator below the insulator, and inside the skirt portion later. , Main room, sub room,
And a space portion for forming an orifice that connects the main chamber and the sub chamber, and a partition member having a cup-like shape is mounted in the space portion having these configurations, whereby the main chamber is formed. , The sub-chamber and the orifice are formed, and the sub-chamber and the orifice are formed in parallel, and further, a thin diaphragm portion is provided in a part of the skirt portion where the sub-chamber exists. Therefore, the sub chamber, the orifice, and the air chamber are formed in parallel.

In addition to these structures, an outer cylinder having a cylindrical shape and having an opening at a part of its lower portion is installed at the skirt portion by an insert means. The insulator is mounted in the holder via the outer cylinder having the above structure and the skirt portion of the outer cylinder inserted.

Further, in addition to these constitutions, the partition member is made of a sheet metal molded product, and the shape thereof is made to be a rotationally symmetrical shape around the axis. .

[0007]

With the above construction, the following actions are exhibited in the present invention. That is, when the liquid-filled type vibration damping device according to the present invention is attached to a vibrating body such as an engine, vibration (displacement) is propagated from the vibrating body (not shown) side to the insulator via the connecting fitting. . Most of the vibrations propagated to the insulator are absorbed by the insulator, and other vibrations act on the liquid chamber or the air chamber provided in the lower portion of the insulator. Absorbed by. By the way, the liquid-filled type vibration damping device of the present invention which operates as described above includes a liquid chamber such as a main chamber and a sub chamber, an orifice connecting the main chamber and the sub chamber, and a sub chamber and an air chamber. A diaphragm part for partitioning the space is integrally formed by a rubber-like elastic body forming an insulator. Further, a space portion forming each of these portions is integrally formed in a lower portion of the insulator by a skirt portion formed continuously with the insulator. Therefore, the cup-shaped partition member is inserted (installed) into the space formed by the skirt portion having these configurations.
By doing so, the sub chamber, the orifice, the air chamber, and the like can be easily formed.

Further, in the liquid filled type vibration damping device of the present invention, since the orifice, the sub chamber, the air chamber, etc. are provided in parallel in the lower portion of the insulator, the axial direction (vertical direction). When the space is reduced and mounted as an engine mount, the space in the engine room can be effectively used. Particularly, since the sub chamber and the orifice are provided in an arc shape as shown in FIG. 2 in the peripheral portion of the cup-shaped partition member for partitioning between the main chamber and the sub chamber, the length of the orifice is reduced. It is possible to freely set the damping characteristic (damping coefficient) and the dynamic spring characteristic (dynamic spring constant) in the vibration isolator.

Further, in the present invention, a vibration-proof rubber main body is formed by assembling (assembling) a partition member having a cup-like shape in the skirt portion of the insulator in a container filled with liquid. It has become so. A liquid-filled type vibration damping device is formed by assembling a holder or the like on the basis of the vibration damping rubber main body in which the liquid is filled (see FIG. 3). By the way, an outer cylinder is inserted in the skirt portion of the present invention, and the skirt portion is in a state of high rigidity. Therefore, after the partition member is mounted on the skirt portion by the assembly work (subassembly) of the vibration isolating rubber main body, the partition member and the skirt portion are kept liquid-tight. Become. That is, since the sealing property between the both is assured, there is no fear that the liquid will leak out from the sealing portion when the holder and the stabilizer are subsequently mounted.

When the partition member is attached to the skirt, the partition member has a rotationally symmetric shape formed around its axis, and its directionality is limited. Since it does not, it is possible to proceed with the mounting work without positioning. Therefore,
The efficiency of the mounting work (subassembly) will be improved. Further, since the partition member itself has a simple shape, the manufacturing process thereof can be simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the structure of the present embodiment is such that a connecting fitting 2 attached to a vibrating body side of an engine or the like, a cup-shaped holder 9 having a mounting bracket 99 attached to a member or the like on the vehicle body side, and these connecting fittings 2 Between the holder 9 and the holder 9 for isolating vibrations from the vibrating body, a liquid chamber such as a main chamber 4, a sub chamber 6 and an orifice 5 provided in a lower portion of the insulator 1, and the insulator 1 It is basically formed by a diaphragm portion 15 that is formed integrally with the above and operates according to the vibration from the insulator 1, and an air chamber 8 into which a compressive fluid is introduced.

In such a basic structure, the connecting fitting 2 is adapted to be connected to a vibrating body such as an engine using bolts and nuts. The insulator 1 is integrally provided on the lower portion of the connecting fitting 2 by vulcanization bonding means or the like. In addition, the insulator 1 is attached to a part of the connecting fitting 2.
A flange-shaped stopper portion 21 serving as a restraining means when a large displacement occurs is provided.

The insulator 1 connected to the connecting fitting 2 having such a structure is made of an elastic body such as a rubber material. Then, in the lower portion of the main insulator 1 having such a configuration, as shown in FIGS. 1 and 2, a cylindrical skirt portion 13 that is continuous with the insulator 1 is provided.
Is provided. Further, inside the skirt portion 13, a space portion for forming the main chamber 4, the orifice 5, and the sub chamber 6 is formed. In these spaces, the main chamber 4 is formed immediately below the insulator 1, and the lower portion of the main chamber 4 has an annular orifice as shown in FIG. 5 and the auxiliary chamber 6 is provided continuously to the orifice 5.

Further, an annular outer cylinder 14 is installed in the skirt portion 13 having such a structure in an inserted state. As shown in FIGS. 1 and 2, an opening (notch) 141 is provided in a part of the lower portion of the outer cylinder 14, and a portion having the opening (notch) 141 is further provided. The skirt portion 13 is formed such that its wall thickness is partially thin. And
The diaphragm portion 15 is formed with this thin portion. An annular air chamber 8 is formed outside the skirt portion 13 including the diaphragm portion 15. Therefore,
As shown in FIG. 2, the orifice 5, the sub-chamber 6 formed continuously with the orifice 5, and the air chamber 8 formed outside the sub-chamber 6 are all arranged in parallel. Is.

The lower portion of the skirt portion 13 having the space portion having the above-mentioned structure has a cup-like shape of a two-stage drawing shape as shown in FIGS. A partition member 3 having a rotationally symmetrical shape formed around the center is mounted. Further, the main partition member 3 having such a shape is formed by a sheet metal molded product such as a steel plate or an aluminum alloy plate. Then, such a partition member 3 is mounted (mounted) in the skirt portion 13 as shown in FIGS. 1 and 3 in the container filled with the liquid.
First, the main chamber 4 and the sub chamber 6 are partitioned by the top partition surface 31 of the partition member 3, and the orifice 5 connecting the main chamber 4 and the sub chamber 6 is provided with the first vertical wall 32,
And the second partition surface 33. After the main chamber 4, the orifice 5 and the sub chamber 6 are formed in this way, the second vertical wall 34 and the inner wall of the lower portion of the skirt portion 13 are fitted to each other, so that the main chamber 4, the orifice 5, liquid chambers such as the sub chamber 6 are formed in a liquid-tight state. As described above, the integrated structure of the insulator 1 and the connecting fitting 2 and the partition member 3 having the above-described configuration are assembled in a container filled with a liquid, so that the liquid as shown in FIG. Thus, the anti-vibration rubber main body 19 in which is encapsulated is formed.

Then, by mounting the holder 9 and the stabilizer 7 on the basis of such a vibration-proof rubber main body 19, the liquid-filled type vibration-damping device according to the present invention is formed. By the way, the holder 9 to which the anti-vibration rubber main body 19 and the like having the above-mentioned configuration are attached is a cup portion 92 having a cup-like shape, and is provided below the cup portion 92. And a mounting bracket 99 that forms a mounting portion to the. And
A taper portion 91 is provided above the cup portion 92 so that the taper portion 12 of the insulator 1 can be pressed against the taper portion 91. Further, a flange portion 93 is provided on the peripheral portion of the taper portion 91 having such a configuration. Then, the skirt portion 13 of the anti-vibration rubber body 19 is fitted into the cup portion 92 of the holder 9 having such a configuration. Since the highly rigid annular outer cylinder 14 is inserted into the skirt portion 13, the skirt portion 13 is fitted into the cup portion 92 by a press-fitting means or the like. Then, the anti-vibration rubber body 1 is formed until the taper portion 12 formed on the insulator 1 contacts the taper portion 91 formed on the upper portion of the cup portion 92.
9 is pushed (fitted) into the cup portion 92 of the holder 9. In this way, by incorporating the vibration-proof rubber main body 19 into the cup portion 92 of the holder 9, as shown in FIG.
An annular air chamber 8 is formed outside the skirt portion 13 having the diaphragm portion 15.

Next, in a state where the vibration-proof rubber main body 19 is assembled in the holder 9 as described above, a cup-like shape with the bottom removed as shown in FIG. 3 is provided above the vibration-proof rubber main body 19. Attach the stabilizer 7. Specifically, the terminal portion 71 of the stabilizer 7 and the flange portion 93 of the holder 9 are engaged with each other. In this case, the connecting fitting 2
The stabilizer 7 and the holder 9 are engaged with each other so that the stopper 21 provided at the contact portion comes into contact with the stopper portion 77 of the stabilizer 7. In other words, in the completed engine mount device, under no load,
The stopper on the rebound side is always installed (operated). Thus, in a state where the insulator 1 is pre-compressed, the stabilizer 7 and the vibration-proof rubber main body 19, by clinching or crimping the terminal portion 71 of the stabilizer 7 to the flange portion 93 of the holder 9, The holder 9 will be integrated. As a result, the tapered portion 12 of the insulator 1 and the tapered portion 91 of the holder 9 are formed as a vibration isolator in a state where they are always pressed, that is, in a state where they are pre-compressed, and the portion of the insulator 1 is A predetermined static spring characteristic (static spring constant) comes to be exhibited.

Next, the operation and the like of this embodiment having such a configuration will be described. First, in FIG. 1, vibration from the side of a vibrating body such as an engine is propagated to the insulator 1 via the connecting fitting 2. As a result, the insulator 1 vibrates or displaces to absorb or block most of the input vibration. Therefore, most of the vibrations are blocked by the insulator 1, but some of the vibrations are not absorbed by the insulator 1 and the main chamber 4, which is provided below the insulator 1, It is absorbed or blocked by the action of the sub chamber 6, the air chamber 8 and the like.

That is, in FIG. 1, the vibration (displacement) from the vibrating body (not shown) side of the engine or the like is not affected by the connecting fitting 2
Is propagated to the insulator 1 via. Then, the vibration of the component that is not absorbed in the insulator 1 portion is propagated from the lower portion of the insulator 1 to the main chamber 4 and the like in which the incompressible fluid (liquid) is sealed. In that case, the vibration (displacement) propagated from the connecting fitting 2 is
First, the liquid acts in the main chamber 4 to flow. By this action, the liquid enclosed in the main chamber 4 flows into the sub chamber 6 through the orifice 5. As a result, the volume of the sub chamber 6 increases, and the diaphragm portion 15 that partitions the sub chamber 6 from the air chamber 8 is deformed. Thereby, the air in the air chamber 8 is compressed.

By passing through such a series of operations, the vibration (displacement) not absorbed at the insulator 1 is absorbed. That is, when the incompressible fluid flows in the orifice 5, a damping function for absorbing vibration is exerted, and
The dynamic spring constant is specified by a change in the volume of air that is a compressive fluid based on the deformation of the diaphragm portion 15 or the like. Due to the action of such a vibration system, the vibration is absorbed and blocked.

Further, in the liquid-filled type vibration damping device of the present embodiment having such an action, as shown in FIGS. 1 and 2, the orifice 5, the sub chamber 6, the diaphragm portion 15, the lower portion of the insulator 1, The air chambers 8 and the like are provided in parallel. Therefore, the space in the axial direction (vertical direction) is reduced, and when mounted as an engine mount, the space in the engine room can be effectively utilized. Further, the space portion forming the main chamber 4, the sub chamber 6, and the orifice 5 is integrally formed in the lower portion of the insulator 1 by the skirt portion 13 provided continuously to the insulator 1. There is something. Therefore, by mounting the cup-shaped partition member 3 as shown in FIG.
The main chamber 4, the orifice 5, the sub chamber 6 and the like can be formed. Therefore, the assembling work (assembly work) of the vibration-proof rubber main body 19 which forms the basis of the liquid-filled type vibration-damping device can be easily performed.

As shown in FIG. 3, the assembling work of the liquid-filled type vibration damping device is performed in a state where the insulator 1 and the partition member 3 are sub-assembled, that is, the liquid-filled type vibration damping device is filled with liquid inside. It is designed such that the holder 9 and the stabilizer 7 and the like are mounted on the vibration rubber main body 19 as a base. Therefore, at the time of these final assembling operations, the liquid is sealed in the vibration-proof rubber body 19, but in the present embodiment, the skirt portion 13 in which the liquid is sealed is the vertical wall. Since the outer cylinder 14 having a high rigidity is inserted in the portion, between the vertical walls 32 and 34 of the partition member 3,
Liquid tightness is ensured. That is, the sealing property of the liquid chamber is secured. As a result, the work of mounting the holder 9 and the like can be performed smoothly.

Further, the partition member 3 for sealing the liquid chamber has a rotationally symmetrical shape and is formed so as to have no directivity for mounting. When mounting on the skirt portion 13,
There is no need for positioning. Therefore, the mounting operation in the container filled with the liquid can be easily performed.

Further, in general, the outer cylinder mounted on the outside of the insulator is provided with a taper portion at a portion supporting the insulator 1 so that the insulator exhibits a predetermined static spring characteristic. There is something. However, in this embodiment, since the tapered portion 91 is formed on the cup portion 92 of the holder 9, the outer cylinder 14 is not provided with the tapered portion, and has a simple cylindrical shape. Has become. Therefore,
The outer cylinder 14 can be downsized.

[0025]

According to the present invention, there is a connecting metal fitting attached to the vibrating body side, a holder mounted to a member on the vehicle body side, etc., and a function of blocking vibration from the vibrating body between the connecting metal fitting and the holder. With respect to the liquid-filled type vibration damping device including an insulator that fulfills the requirements, and a main chamber and a sub-chamber, etc., which are provided continuously to the insulator and in which a non-compressible fluid (liquid) is filled, a lower part of the insulator is provided. A cylindrical skirt portion is provided continuously to the insulator, and inside the skirt portion,
Later, a space for forming a main chamber, a sub chamber, and an orifice connecting the main chamber and the sub chamber is provided, and a partitioning member having a cup-like shape is mounted in the space formed of these components. As a result, the main chamber, the sub-chamber, and the orifice are formed, and the sub-chamber and the orifice are formed in parallel, and further, in a part of the skirt portion where the sub-chamber is present. Since the thin-walled diaphragm portion is provided and the sub-chamber, the orifice, and the air chamber are formed in parallel with each other, the entire liquid-filled type vibration damping device is axially (up and down). ), It has become possible to make it compact without taking up much space.

Further, the vibration-damping rubber main body forming the main part of the liquid-filled type vibration-damping device is formed by mounting a cup-shaped partition member in the space inside the skirt formed integrally with the insulator. As a result, the liquid filling work in the liquid chamber can be performed by a simple work without requiring a lot of space. By attaching a stabilizer or a holder made of a large metal fitting or the like having a mounting bracket to the vehicle body to the antivibration rubber body formed by such a simple assembling work, a liquid-filled antivibration device is provided. As a result, the efficiency of assembly work (assembly work) can be improved.

Further, the skirt portion, which is the portion in which the liquid is sealed, of the vibration damping rubber main body, which is the basis of the liquid-filled type vibration damping device according to the present invention, is reinforced by an outer cylinder having high rigidity. Since the cup-shaped partition member is attached to such a skirt to form the liquid chamber, the sealing property around the liquid chamber can be reliably ensured. It was Therefore, since the holder and the stabilizer are mounted (assembled) on the basis of the vibration-proof rubber main body whose sealability is ensured, the assembly work (assembly) of the liquid-filled type vibration-damping device is performed. Work) is now carried out smoothly and efficiently.

Further, the partition member 3 which contributes to the formation of the liquid chamber of the vibration-proof rubber main body has a rotationally symmetrical shape formed around the axial center, and its directionality is limited. Since it is made of a non-form, there is no need to perform positioning work etc. during the mounting work,
Work efficiency has been improved. Therefore, it is possible to improve the efficiency of the assembly work of the entire liquid-filled type vibration damping device.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall configuration of the present invention.

FIG. 2 is a cross-sectional view showing a configuration around a sub chamber, an orifice, and an air chamber according to the present invention.

FIG. 3 is a diagram showing an assembling procedure of the liquid filled type vibration damping device according to the present invention.

[Explanation of symbols]

1 insulator 11 Flange 12 Tapered part 13 Skirt 14 outer cylinder 141 opening 15 Diaphragm part 19 Anti-vibration rubber body 2 connection metal fittings 21 Stopper 3 partition members 31 Top Partition 32 First vertical wall 33 Second partition 34 Second vertical wall 4 main room 5 orifice 6 Sub-room 7 Stabilizer 71 Terminal 77 Stopper 8 air chambers 9 holder 91 Tapered part 92 cups 93 Flange 99 mounting bracket

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Claims (3)

(57) [Claims] 1. A connecting fitting attached to the vibrating body side,
A holder attached to a member on the vehicle body side, an insulator that acts between the connecting fitting and the holder and blocks vibrations from the vibrating body, and an incompressible fluid (continuously provided on the insulator). liquid)
In a liquid-filled type vibration damping device including a main chamber and a sub-chamber, etc., in which a cylindrical skirt portion is provided continuously to the insulator below the insulator, and a main skirt is provided inside the skirt portion. A chamber, a sub chamber, and a space portion for forming an orifice connecting the main chamber and the sub chamber are provided, and a partition member having a cup-like shape is mounted in the space portion having these configurations. To form the main chamber, the sub-chamber, and the orifice, and to form the sub-chamber and the orifice in parallel, and further, to form a thin-walled diaphragm in a part of the skirt portion where the sub-chamber exists. Section, and by these,
A liquid-filled type vibration damping device having a configuration in which the sub chamber, the orifice, and the air chamber are formed in parallel. 2. The liquid filled type vibration damping device according to claim 1, wherein the skirt portion is provided with an outer cylinder having a cylindrical shape and having an opening at a part of a lower portion thereof. A liquid-filled type vibration damping device having a configuration in which the insulator is mounted in the holder via the outer cylinder having the above configuration and the skirt portion in which the outer cylinder is inserted. 3. The liquid-filled type vibration damping device according to claim 1, wherein the partition member is formed of a sheet metal molded product, and the shape thereof is a rotationally symmetrical shape about an axis. A liquid-filled type vibration damping device characterized in that