JPH06307490A - Liquid enclosed type vibration proofing device - Google Patents

Abstract

PURPOSE:To integrally form the chambers such as liquid chambers in which a fluid is enclosed, a partition plate, a diaphragm, dividing these chambers, using the same rubber material as that of an insulator. CONSTITUTION:An insulator 1 made up of an elastic body such as rubber is provided between a connecting hardware 2 to be attached to the engine side and a holder 3 to be attached to a member on the car body side. A main chamber 5 and an accessory chamber 7 in which an incompreesible fluid is sealed, and an orifice 6 connecting these chambers, are provided in the lower part of the insulator 1. Further, an air chamber 8 which is filled with a compressible fluid or air, is provided adjacent to the accessory chamber 7 through a diaphragm 9. These chambers 5,7,8, the orifice 6, a partition part, and the diaphragm 9 are provided in parallel, and formed integrally with the insulator 1. Thus, the number of part items is reduced, the assembling process is simplified, and the manufacturing cost is reduced. An axial direction space is eliminated, and the degree of freedom for the layout is increased.

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 an anti-vibration device in which liquid chambers and the like that are enclosed are provided in parallel, thereby reducing the space in the axial direction (vertical direction) and reducing the number of constituent parts.

[0002]

2. Description of the Related Art Among anti-vibration devices, particularly engine mounts for automobiles, the engine, which is the power source, is operated under various conditions from the idle operation state to the maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. Generally, a vibration control device as an engine mount aims to block idling vibration that is targeted for torque fluctuations caused by explosive combustion of the engine or vibration such as shake that is targeted for a resonance phenomenon between the engine and the engine mount. , System setting (tuning) is performed. However, in order to prevent (isolate) these vibrations, it is difficult to avoid the resonance phenomenon by selecting the spring constant, and it is difficult to avoid the resonance phenomenon. It is conceivable that the vibration should be blocked to the side. In order to deal with these plural conditions, a so-called liquid-filled engine mount (vibration isolator) having two liquid chambers inside and connecting them with an orifice has already been devised. Has become.

The above-mentioned publicly known device has a structure in which the respective constituent parts are laid out in series in the axial direction (vertical direction) as shown in FIG. 3, for example. That is, as shown in FIG. 3, the conventional liquid-filled type vibration damping device includes an upper coupling member 20 coupled to an engine or the like via a mounting bolt 250, an insulator 10 provided below the upper coupling member 20, A main chamber 50 provided in a lower portion of the insulator 10 and in which an incompressible fluid is sealed,
The incompressible fluid flows between the main chamber 50 and the sub-chamber 70, which is provided below the main chamber 50 with a partition plate 110 therebetween and in which the incompressible fluid is sealed. It comprises an orifice 60 which is connected as much as possible, an air chamber 80 which is provided below the sub chamber 70, and into which a compressive fluid such as air is introduced. Then, these are installed in series in the vertical direction, and further, the components installed in series are integrated by a lower connecting fitting 340 and a holder 30 which are attached to a member on the vehicle body side. An enclosed vibration damping device is formed.

[0004]

By the way, the above-mentioned known device requires a lot of space in the vertical direction because each component is installed in series in the vertical direction. When mounted as a mount, it is subject to space restrictions. Further, the conventional vibration isolator has a large number of parts, and when assembled as a liquid-filled type vibration isolator, there is a problem that it takes a lot of time for the assembling work. Particularly, in the structure as shown in FIG. 3, the partition plate 1 which is a separate component is based on the insulator 10 integrally connected to the upper coupling fitting 20 and the inner case 40.
The vibration damping device is formed by attaching the 10, the diaphragm 90, etc. by press fitting, etc., and by further attaching the lower connecting fitting 340, the holder 30, etc. to the thus assembled to some extent, that is, the sub-assembled one. It is a thing. When mounting the partition plate 110, the diaphragm 90, etc., it is necessary to seal the non-compressible fluid in the main chamber 50 and the sub-chamber 70. Also, the main chamber 50 and the sub chamber 7
There is a problem in that it must be carried out so that air bubbles (air) do not enter 0 or the like. It is an object of the present invention to solve the above problems and to provide a compact liquid-filled type vibration damping device having a small number of parts and not taking up much space in the vertical direction. )
Is.

[0005]

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 between the connecting fitting and the holder for blocking vibration from the vibrating body, and an insulator connected to the insulator. A liquid-filled type vibration damping device including a liquid chamber formed by a main chamber and a sub-chamber in which a non-compressible fluid is filled, and the main chamber and the sub-chamber, and both chambers. The orifices that connect the two chambers, and further the air chambers that are continuously provided in the sub chambers via the diaphragms are provided in parallel, and these chambers are connected to the insulator made of an elastic body and integrally. It was decided to adopt the configuration provided in.

[0006]

By adopting the above construction, the following effects are exhibited in the present invention. That is, in FIG. 1, the vibration from the vibrating body side such as the engine is propagated to the insulator 1 via the connecting fitting 2. As a result, the insulator 1 vibrates or displaces,
Most of the input vibration is absorbed or blocked. Therefore, most of the vibration is blocked by the insulator 1, but some of the vibration is not absorbed at the insulator 1 but propagates to the vehicle body side through the holder 3 and the like. There is. Therefore, in the present invention,
The vibration of the component (frequency) that cannot be absorbed by the insulator 1 is attempted to be absorbed or blocked by the action of the liquid chambers 5 and 7 and the air chamber 8 provided in the lower portion of the insulator 1. It is a thing. The specific operation will be described with reference to FIGS. 1 and 2.

First, in FIG. 1, vibration (displacement) from the side of a vibrating body (not shown) such as an engine is propagated to the insulator 1 via the flange portion 21 of the connecting fitting 2.
Then, the vibration of the component that cannot be absorbed by the portion of the insulator 1 is propagated from the lower portion of the insulator 1 to the liquid chambers 5 and 7 in which the incompressible fluid (liquid) is sealed. In that case, the flange portion 2 of the connecting fitting 2
The vibration (displacement) propagated from 1 first acts so as to cause the liquid in the main chamber 5 to flow. That is, it acts so as to change the volume of the main chamber 5. By this action, the liquid sealed in the main chamber 5 flows to the sub chamber 7 through the passage-shaped orifice 6 shown in FIG. As a result, the volume of the sub-chamber 7 increases, and as shown in FIG.
A diaphragm 9 for partitioning between the sub chamber 7 and the air chamber 8.
Is deformed as shown by the chain double-dashed line, and the air that is the compressive fluid in the air chamber 8 is compressed. In the present invention,
Since the air chamber 8 is opened to the atmosphere through the communication port 31, the air compressed to some extent cannot be communicated with the communication port 31.
Will be released into the atmosphere via.

By going 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 6, a damping force for absorbing vibration is exerted, and the volume of the compressible fluid, such as air, is changed based on the deformation of the diaphragm 9 and the like. The dynamic spring constant will be specified. Vibrations are absorbed and blocked by the action of these vibration systems.

As shown in FIGS. 1 and 2, the liquid-filled type vibration damping device of the present invention having such an action has liquid chambers 5 and 7, a partition portion 11 serving as a partition plate, a diaphragm 9, an air chamber. A so-called liquid-sealing anti-vibration mechanism such as 8 is integrally formed of an elastic body such as rubber forming the insulator 1. Therefore, the number of component parts is reduced, and the partition plate mounting or the diaphragm mounting, which has been a problem in the conventional one,
Further, complicated work such as filling (enclosing) the non-compressible fluid into the liquid chamber is simplified. Therefore, it is possible to reduce the manufacturing cost including the simplification of the assembling work including the production and management of the parts.

Further, in the liquid-filled type vibration damping device of the present invention, a main chamber 5, an orifice 6, a sub chamber 7, a diaphragm 9, an air chamber 8 and the like are provided in parallel below the insulator 1. 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, since the orifice 6 connecting the main chamber 5 and the sub chamber 7 is provided in an arc shape around the axis as shown in FIG. 2, its length can be freely set. It becomes possible to freely select the damping characteristic (coefficient) and the dynamic spring characteristic (constant) in the vibration isolator.

[0011]

Embodiments of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the structure of the present embodiment is such that a connecting fitting 2 attached to the vibrating body side of an engine or the like, an insulator 1 integrally provided on the connecting fitting 2 by vulcanization adhesion, and the like It is basically composed of a main chamber 5, a sub-chamber 7, a fluid filled portion such as an air chamber 8 which are provided in parallel with each other.

In such a basic structure, the connecting metal fitting 2 is provided with a mounting bolt 25 which is a mounting portion for an engine (not shown) or the like, and the connecting metal fitting 2 is also provided.
A flange portion 21 for transmitting vibration and displacement with the insulator 1 is provided in the lower portion of the. The flange portion 21 also serves as a rebound stopper when the engine is largely displaced.

The insulator 1 connected to the connecting fitting 2 having such a structure is made of an elastic body such as a rubber material. Especially, in this embodiment, as shown in FIG. The main chamber 5, the orifice 6, the sub chamber 7, the diaphragm 9, and the air chamber 8 are integrally formed in the portion by a rubber material or the like which also forms the insulator 1. As shown in FIG. 2, these chambers are arranged in parallel in a plane perpendicular to the axial direction.

Incidentally, the main chamber 5 having the above structure.
A partition portion 11 as shown in FIG.
It is made of the same material as the rubber material forming the insulator 1, and further has a communication passage shape in which an incompressible fluid (liquid) can flow between the main chamber 5 and the sub chamber 7. The orifice 6 is provided. The orifice 6 has a structure in which its length can be freely selected according to the vibration system. A diaphragm-like diaphragm 9 made of the same rubber material as that of the insulator 1 is provided next to the liquid chamber including the main chamber 5 and the sub-chamber 7, and the diaphragm 9 is connected to the sub-chamber 7 continuously. Then, the air chamber 8 is provided.

A cylindrical inner case 4 is provided on the outside so as to enclose each chamber having such a structure, and the inner case 4 is vulcanized and bonded to the insulator 1 together with the connecting fitting 2. Etc. are provided integrally. As shown in FIG. 1, the insulator 1 having the liquid chambers 5, 7 and the like integrated in the inner case 4 is housed in the cup-shaped holder 3 as shown in FIG. After mounting, the cup edge portion 33 of the holder 3 is swaged (caulked) to form the vibration damping device. When the insulator 1 integrated with the inner case 4 is housed in the cup-shaped holder 3, the main chamber 5 and the sub-chamber 7 are filled (enclosed) with an incompressible fluid (liquid). As a result, a liquid-filled type vibration damping device is formed.

The operation of this embodiment having such a configuration will be described. In FIG. 1, vibration from the vibrating body side of the engine or the like 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 vibration is blocked by the insulator 1, but some of the vibration is not absorbed by the insulator 1 and the holder 3 is not absorbed.
May be propagated to the vehicle body side via the above. Therefore, in the present embodiment, the vibration of the component (frequency) that could not be absorbed in the insulator 1 portion is caused by the action of the liquid chambers 5, 7 and the air chamber 8 provided in the lower portion of the insulator 1, It is one that seeks to be absorbed or blocked.

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 the flange portion 21 of the. Then, the vibration of the component that is not absorbed in the insulator 1 is applied from the lower part of the insulator 1 to the liquid chambers 5 and 7 in which the incompressible fluid (liquid) is sealed.
And so on. In that case, the vibration (displacement) propagated from the flange portion 21 of the connecting fitting 2 first acts to cause the liquid in the main chamber 5 to flow. That is, the main room 5
Acts to change the volume of. By this action, the liquid sealed in the main chamber 5 flows to the sub chamber 7 through the passage-shaped orifice 6 shown in FIG. As a result, the volume of the sub-chamber 7 increases, and as shown in FIG. 2, the diaphragm 9 that partitions the sub-chamber 7 from the air chamber 8 is deformed as shown by the two-dot chain line. by this,
Air, which is a compressible fluid in the air chamber 8, is compressed. In the present embodiment, since the air chamber 8 is opened to the atmosphere through the communication port 31, the air compressed to some extent is released to the atmosphere through the communication port 31. Becomes

By going 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 6, 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 compressible fluid based on the deformation of the diaphragm 9 or the like. Due to the action of such a vibration system, the vibration is absorbed and blocked.

The liquid filled type vibration damping device of this embodiment is
Since the main chamber 5, the orifice 6, the auxiliary chamber 7, the diaphragm 9, the air chamber 8 and the like are provided in parallel in the lower portion of the insulator 1, the space in the axial direction (vertical direction) is reduced. To be done. Therefore, when mounted as an engine mount or the like, the space in the engine room can be effectively used. Further, since the orifice 6 connecting the main chamber 5 and the sub chamber 7 is provided in an arc shape around the axis as shown in FIG. 2, its length can be freely set. It becomes possible to freely select the damping characteristic (coefficient) and the dynamic spring characteristic (constant) in the vibration isolator.

[0020]

According to the present invention, a connecting metal fitting attached to the vibrating body side, a holder mounted to a member on the vehicle body side, and a function for cutting off vibration from the vibrating body are provided between the connecting metal fitting and the holder. Regarding a liquid-filled type vibration damping device including an insulator that is exerted and a liquid chamber and the like that are provided continuously to the insulator and that are formed in a main chamber and a sub-chamber in which an incompressible fluid is sealed, Chamber and sub chamber, and an orifice connecting both chambers,
Further, air chambers continuously provided in the sub chamber through a diaphragm are provided in parallel, and these chambers are continuously connected to an insulator made of an elastic body,
Moreover, since it is decided to adopt a configuration that is integrally provided,
It is possible to absorb and block vibrations in a wide range of frequencies, and it is possible to form a vibration damping device that has the function of blocking these vibrations in a compact form without taking up much space in the axial direction (vertical direction). It became so.
Further, since the vibration isolating mechanism portion including so-called fluid chambers such as liquid chambers and air chambers are all integrally formed of the same elastic body as the insulator, the number of components as a whole is reduced. Reduction of the number of partitions, which has been a problem with conventional ones, or the installation of diaphragms,
Furthermore, it has become possible to simplify complicated operations such as filling (filling) the incompressible fluid into the liquid chamber. Therefore, the assembling work including the manufacture and management of the parts can be simplified, and the manufacturing cost can be reduced.

[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 fluid chamber which is a main part of the present invention.

FIG. 3 is a vertical cross-sectional view showing the overall configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 11 Partition part 2 Connecting metal fitting 21 Flange part 25 Mounting bolt 3 Holder 31 Communication port 33 Cup edge part (caulking part) 35 Mounting bolt 4 Inner case 5 Main chamber 6 Orifice 7 Sub chamber 8 Air chamber 9 Diaphragm 99 Stopper plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ri Nakagaki 1 Ochiai, Nagachi, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Gosei Co., Ltd. Toyoda Gosei Co., Ltd.

Claims (1)

[Claims] 1. A connecting fitting attached to the vibrating body side, a holder attached to a vehicle body side member, etc., and an insulator between the connecting fitting and the holder that exerts a function of blocking vibration from the vibrating body. A liquid-filled type vibration damping device that is provided continuously to an insulator and that includes a liquid chamber formed by a main chamber and a sub-chamber in which a non-compressible fluid is filled. An orifice connecting these two chambers, and further, air chambers continuously provided through the diaphragm in the sub chamber are provided in parallel with each other, and these chambers are continuously connected to an insulator made of an elastic body, and A liquid-filled type vibration damping device having a configuration in which it is integrally provided.