JP3519101B2 - Liquid filled type vibration damping device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device in which a vibration damping effect is obtained based on the flow of a liquid (fluid) sealed inside. The present invention relates to an apparatus, in particular, a liquid chamber or the like in which the liquid is filled is provided in parallel, thereby reducing the space in the axial direction (vertical direction) and reducing the number of components. The present invention relates to an anti-vibration device. 2. Description of the Related Art Among vibration damping devices, especially in an engine mount for an automobile, an engine, which is a power source, operates in various modes during a period from an idling operation to a maximum rotation speed. Because it is used in situations, it must be able to handle a wide range of frequencies. In general, vibration isolators as engine mounts are designed to cut off vibrations such as idling vibrations for torque fluctuations caused by explosion and combustion of the engine or shakes for resonance phenomena between the engine and the engine mounts. , The system is set (tuned). However, in order to prevent (interrupt) these vibrations, it is difficult to avoid the resonance phenomenon by selecting a spring constant, and it is difficult to avoid the resonance phenomenon. It is conceivable that the vibration is cut off to the side. In order to cope with these plural conditions, a so-called liquid-filled engine mount (vibration isolator) in which two liquid chambers are provided inside and connected with an orifice has already been devised. Has become. [0003] The above-mentioned known components have a configuration in which respective components 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 connecting fitting 20 connected to an engine or the like via a mounting bolt 250 or the like, an insulator 10 provided below the upper connecting fitting 20, A main chamber 50 provided below the insulator 10 and filled with an incompressible fluid;
The sub-chamber 70 is provided below the main chamber 50 with a partition plate 110 therebetween, and is filled with the non-compressible fluid. The non-compressible fluid flows between the main chamber 50 and the sub-chamber 70. The orifice 60 is connected to the sub-chamber 70 so as to be connected to the sub-chamber 70, and an air chamber 80 into which a compressive fluid such as air is introduced. These components are arranged in series in the up-down direction, and the components arranged in series are further integrated by a lower connecting metal fitting 340 and a holder 30 attached to a vehicle body-side member, etc. An enclosed vibration isolator is formed. [0004] The above-mentioned known devices require a large amount of space in the vertical direction because each component is installed in series in the vertical direction. When mounted as an engine mount for an automobile, there are restrictions on space. In addition, the above-described conventional vibration isolator has a problem in that the number of parts is large, and when assembling as a liquid-filled type vibration isolator, the assembling operation requires a lot of time. In particular, in the configuration shown in FIG. 3, a partition plate 1 made of a separate component is provided on the basis of the insulator 10 integrally connected to the upper connection fitting 20 and the inner case 40.
10, the diaphragm 90 and the like are attached by press-fitting or the like, and the vibration isolator is formed by attaching the lower connecting fitting 340, the holder 30 and the like to the assembly assembled to some extent in this way, that is, the sub-assembly. Things. In mounting the partition plate 110, the diaphragm 90, and the like, it is necessary to enclose an incompressible fluid in the main chamber 50 and the sub-chamber 70. Therefore, these operations are performed in a container filled with liquid or the like. And the main room 50 and the sub room 7
There is a problem that it is necessary to carry out the process so that air bubbles (air) do not enter 0 or the like. SUMMARY OF THE INVENTION An object of the present invention is to provide a compact liquid-filled type vibration damping device that solves such a problem and has a small number of parts and does not take up much space in the vertical direction. )
It is. [0005] In order to solve the above problems, the present invention takes the following measures. That is, a coupling fitting attached to the vibrating body side, a cup-shaped holder attached to the vehicle body side member and the like, an insulator which is provided between the coupling fitting and the holder and has a function of blocking vibration from the vibrating body, In a liquid-sealed type vibration damping device including a liquid chamber formed of a main chamber and a sub-chamber that are provided continuously with an insulator and that is filled with an incompressible fluid, the main chamber and the sub-chambers include:
An orifice connecting between these two chambers, and further, air chambers provided continuously through the diaphragm in the sub-chamber are provided in parallel with each other, and these chambers are connected to an insulator made of an elastic body, and , To be provided integrally below the lower part, and to the insulator
A partitioning part that continues and separates the main chamber and the sub-chamber,
Along the radial direction of the insulator, and in the radial direction
Set straight so that it passes below the inner insulator part
And the orifice is positioned inside the partition in the radial direction.
Set an arcuate flow path around the axis of the opening between portions, the
The outside of each chamber and orifice is cylindrical
Provide an inner case, and attach this inner case to the holder
Receiving the lower end of the partition,
The lower end of the orifice forming wall connected to the
Liquid-filled anti-vibration mounted on the bottom wall of the damper from below
apparatus. With the above configuration, the present invention has the following functions. That is, in FIG. 1, the vibration from the vibrating body side such as the engine is transmitted to the insulator 1 via the connection fitting 2. This causes the insulator 1 to vibrate or displace,
Absorb or block most of the input vibration. Therefore, most of the vibration is cut off by the insulator 1, but some of the vibration is not absorbed by the insulator 1 but propagated to the vehicle body via the holder 3 and the like. There is. Therefore, in the present invention,
The vibration of the component (frequency) that could not be absorbed by the insulator 1 is absorbed or blocked by the action of the liquid chambers 5 and 7 and the air chamber 8 provided below the insulator 1. Things. The specific operation will be described with reference to FIGS. First, in FIG. 1, vibration (displacement) from a vibrating body (not shown) such as an engine is propagated to the insulator 1 via the flange 21 of the connection fitting 2.
Then, the vibration of the component that cannot be absorbed by the insulator 1 is propagated from the lower part of the insulator 1 to the liquid chambers 5, 7 and the like in which the incompressible fluid (liquid) is sealed. In that case, the flange portion 2 of the connection fitting 2
The vibration (displacement) propagated from 1 acts to flow the liquid in the main chamber 5 first. That is, it acts 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.
Diaphragm 9 for partitioning between sub-chamber 7 and air chamber 8
Is deformed as shown by a two-dot chain line, and the air which is a compressible fluid in the air chamber 8 is compressed. In the present invention,
Since the air chamber 8 is open to the atmosphere through the communication port 31, the air compressed to a certain extent cannot pass through the communication port 31.
And will be released to the atmosphere via Through such a series of operations, vibrations (displacements) not absorbed by the insulator 1 are absorbed. That is, when the incompressible fluid flows through the orifice 6, a damping force for absorbing vibration is exhibited, and the volume of air, which is a compressible fluid, due to the deformation of the diaphragm 9 and the like change. The dynamic spring constant is specified. By the action of these vibration systems, the vibration is absorbed and cut off. As shown in FIGS. 1 and 2, the liquid-filled type vibration damping device of the present invention having the above-mentioned functions has liquid chambers 5, 7, a partition part 11 serving as a partition plate, a diaphragm 9, an air chamber. 8, etc., all of which are so-called liquid-insulated vibration isolating mechanisms are integrally formed of an elastic body such as rubber which constitutes the insulator 1. Therefore, the number of components is reduced, and mounting of a partition plate or mounting of a diaphragm,
Further, complicated operations such as filling (enclosing) the liquid chamber with the incompressible fluid are simplified. Therefore, the manufacturing cost can be reduced, including the simplification of the assembling work as well as the production and management of parts. 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) can be reduced, and when it is 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 around the axis as shown in FIG. 2, its length can be freely set. The damping characteristic (coefficient) and dynamic spring characteristic (constant) of the vibration isolator can be freely selected. An embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the configuration of the present embodiment includes a connection fitting 2 attached to a vibrating body side of an engine or the like, an insulator 1 integrally provided on the connection fitting 2 by vulcanization or the like, and a lower part of the insulator 1. It is basically composed of a main chamber 5, a sub-chamber 7, an air chamber 8, and other fluid-filled sections provided in parallel. In such a basic configuration, the connection fitting 2 is provided with a mounting bolt 25 which forms a mounting portion to an engine (not shown) or the like.
A flange portion 21 for transmitting vibration and displacement between itself and the insulator 1 is provided at a lower portion of the flange 1. The flange portion 21 also serves as a rebound stopper when the engine makes a large displacement. The insulator 1 connected to the connecting fitting 2 having such a configuration is made of an elastic material such as a rubber material. 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 of a rubber material or the like that forms the insulator 1. As shown in FIG. 2, these chambers are arranged in parallel in a plane perpendicular to the axial direction. The main chamber 5 having the above-described configuration is used.
A partition 11 as shown in FIG.
It is provided with the same material as the rubber material forming the insulator 1, and further has a communication path between the main chamber 5 and the sub chamber 7 through which an incompressible fluid (liquid) can flow. Orifice 6 is provided. The length of the orifice 6 can be freely selected according to the vibration system. A diaphragm 9 in the form of a diaphragm made of the same rubber material as the insulator 1 is provided beside the liquid chamber including the main chamber 5 and the sub-chamber 7. The diaphragm 9 is continuous with the sub-chamber 7 via the diaphragm 9. And an air chamber 8 is provided. A cylindrical inner case 4 is provided outside the chamber so as to enclose each chamber having such a configuration. The inner case 4 is vulcanized and bonded to the insulator 1 together with the connection fitting 2. And the like are provided integrally. As described above, the insulator 1 having the respective 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 3 is crimped (crimped) on the cup edge 33 of the holder 3 to form the vibration isolator. When housing the insulator 1 integrated with the inner case 4 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-sealed vibration damping device is formed. The operation of the present embodiment having such a configuration will be described. In FIG. 1, vibration from a vibrating body such as an engine is transmitted to an insulator 1 via a connection fitting 2. Thus, the insulator 1 vibrates or displaces, and absorbs or blocks most of the input vibration. Accordingly, most of the vibration is cut off 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 transmitted to the vehicle body via the like. Therefore, in the present embodiment, the vibration of the component (frequency) that could not be absorbed by the insulator 1 is caused by the action of the liquid chambers 5, 7 and the air chamber 8 provided below the insulator 1. They try to absorb or block. That is, in FIG. 1, vibration (displacement) from a vibrating body (not shown) such as an engine is applied to the connection fitting 2.
Is propagated to the insulator 1 through the flange portion 21 of the second member. Then, the vibration of the component not absorbed by the insulator 1 is applied to the liquid chambers 5, 7 in which the incompressible fluid (liquid) is sealed from the lower part of the insulator 1.
And so on. In this case, the vibration (displacement) propagated from the flange portion 21 of the connection fitting 2 first acts to flow the liquid in the main chamber 5. That is, the main room 5
Acts to change the volume of the 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 the diaphragm 9 partitioning between the sub-chamber 7 and the air chamber 8 is deformed as shown by a two-dot chain line in FIG. by this,
Air, which is a compressible fluid in the air chamber 8, is compressed. In this embodiment, since the air chamber 8 is opened to the atmosphere through the communication port 31, air compressed to some extent is discharged to the atmosphere through the communication port 31. It becomes. Through such a series of operations, vibrations (displacements) not absorbed by the insulator 1 are absorbed. In other words, the incompressible fluid flows through the orifice 6, thereby exhibiting a damping function for absorbing vibration.
The dynamic spring constant is specified by a change in the volume of air, which is a compressible fluid, based on the deformation of the diaphragm 9 and the like. By the action of such a vibration system, the vibration is absorbed and cut off. The liquid-filled type vibration damping device of this embodiment is
Since the main chamber 5, the orifice 6, the sub chamber 7, the diaphragm 9, the air chamber 8 and the like are provided in parallel below the insulator 1, the space in the axial direction (vertical direction) is reduced. Is done. Therefore, when mounted as an engine mount or the like, 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 around the axis as shown in FIG. 2, the length can be freely set. The damping characteristic (coefficient) and dynamic spring characteristic (constant) of the vibration isolator can be freely selected. According to the present invention, the connecting member attached to the vibrating member, the holder attached to the vehicle body-side member and the like, and the vibration from the vibrating member are interposed between the connecting member and the holder. And a liquid-sealed vibration isolator comprising a liquid chamber formed of a main chamber and a sub-chamber which are provided continuously with the insulator and which is filled with an incompressible fluid. , The main and sub-chambers, and orifices connecting these two chambers,
Further, air chambers provided continuously in the sub-chamber via a diaphragm are provided in parallel with each other, and these chambers are connected to an insulator made of an elastic body,
And because we decided to adopt a configuration that is provided integrally,
It is possible to absorb and block vibrations of a wide range of frequencies, and to form a vibration isolator that exhibits the function of blocking these vibrations compactly without taking up much space in the axial direction (vertical direction). It became so.
In addition, since the vibration isolating mechanism including a liquid chamber, an air chamber, and the like, which is a so-called fluid chamber, are all formed of the same elastic body as the insulator and are integrally formed, the number of components as a whole is reduced. The installation of the partition plate or the installation of the diaphragm, which has been reduced
Furthermore, complicated operations such as filling (enclosing) the liquid chamber with an incompressible fluid can be simplified. Accordingly, simplification of the assembling work, including the production and management of parts, has been achieved, thereby making it possible to reduce the manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal 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 longitudinal sectional view showing the entire configuration of a conventional example. [Explanation of Signs] 1 Insulator 11 Partition 2 Connecting fitting 21 Flange 25 Mounting bolt 3 Holder 31 Communication port 33 Cup edge (caulking) 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 Futami Hatama 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (56) References JP-A-62-204030 (JP, A) JP-A-3-342 (JP, A) Japanese Utility Model Showa 59-177844 (JP, U) Japanese Utility Model Showa 62-72276 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 13/00 B60K 5 / 12

Claims (1)

(57) [Claims 1] A connecting fitting attached to the vibrating body side, a cup-shaped holder attached to the vehicle body side member and the like, and a connecting means between the connecting fitting and the holder, the connecting fitting being attached to the vibrating body. A liquid-sealing-type prevention device comprising an insulator having a function of blocking vibration, and a liquid chamber and the like provided continuously with the insulator and formed of a main chamber and a sub-chamber in which an incompressible fluid is sealed. In the vibration device, the main chamber and the sub-chamber, and the orifice connecting between the two chambers, and further, the air chamber continuously provided through the diaphragm in the sub-chamber is provided in parallel with each other, these chambers The main chamber and the sub-chamber are connected to the insulator made of an elastic body, and are provided integrally below the insulator.
Partition along the radial direction of the insulator.
And below the radially inner insulator portion.
And set the orifice to the diameter
Arc around the axis that opens in the middle of the partition part
Set the flow path of the above, and a cylinder outside the
The inner case is provided, and this inner case is
And the lower end of the partition portion,
The lower end of the orifice forming wall continuous with the
Liquid-filled type that is received from the bottom on the bottom wall of the holder
Anti-vibration device.