JPH0735190A - Liquid sealing vibration isolator - Google Patents

Abstract

PURPOSE:To unify a partition plate, an orifice and a diaphragm as one body and reduce the number of part items. CONSTITUTION:An insulator 5, a main chamber 6, an air chamber 4, and an auxiliary chamber 7 are all set up in space between a connecting fitting 8 to be attached to the side of a vibrator and a holder 3 to be attached to the side of a car body in series. An orifice part 11 forming an orifice 1 interconnecting an interval between the main chamber 6 and the auxiliary chamber 7 and a diaphragm part 12 partitioning off an interval between the auxiliary chamber 7 and the air chamber 4 both are integrally formed with a rubber material, while these elements are unified with a partition plate 2 to be installed in a lower part of the main chamber 6 as one body through vulcanizing and sticking means and so on. These unified element (orifice and diaphragm formed bodies) are set up in a lower part of the insulator 5, thereby forming a liquid sealing type vibration isolator. With this constitution, since the orifice 1 and the air chamber 4 or the like are integrally formed by the orifice-diaphragm formed body, the number of part item becomes lessened and, what is more, assembly operation becomes facilitated.

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 which has a vibration damping effect based on the flow action of a fluid (liquid) sealed inside. An orifice that connects between the main chamber and the sub chamber, and a diaphragm that separates between the sub chamber and the air chamber are integrally provided, and by these integrally provided members (orifice / diaphragm molded body), The present invention relates to a vibration isolator that forms a liquid chamber, an air chamber, and the like.

[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 of the engine mount, and it is difficult to avoid the resonance phenomenon, so increase the damping coefficient. It may be considered that the vibration is cut off to the vehicle body side. In order to respond to these multiple conditions, two liquid chambers are provided inside, and an orifice is connected between them.
So-called liquid-filled engine mounts (anti-vibration devices) have already been devised and are known.

For example, as shown in FIG. 4, the above-mentioned publicly known one is a connecting fitting 80 connected to an engine or the like via a mounting bolt 850, an insulator 50 provided below the connecting fitting 80, and the insulator 50. Main chamber 6 provided in the lower part and containing an incompressible fluid
0, a sub-chamber 70 provided below the main chamber 60 with a partition plate 20 therebetween, and in which a non-compressible fluid is sealed, and the incompressible fluid between the main chamber 60 and the sub-chamber 70. And an air chamber 40 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 holder 30 or the like attached to a member on the vehicle body side or the like, whereby a liquid-filled type vibration isolation device is provided. The device is formed.

[0004]

However, the above-mentioned known device has a large number of parts, and when assembled as a liquid-filled type vibration damping device, it takes a lot of time for the assembly work. In particular, in the structure as shown in FIG. 4, the insulator 50 integrated with the connecting fitting 80 and the housing 90 is used as a base,
In addition to this, the partition plate 20 and the diaphragm 12 which are separate parts
0 is attached by press fitting or the like, and the vibration proof device is formed by further attaching the holder 30 or the like to the thus assembled to some extent, that is, the sub-assembled one. When mounting the partition plate 20, the diaphragm 120 and the like, it is necessary to seal the incompressible fluid in the main chamber 60 and the sub-chamber 70. Therefore, these operations are performed in a container filled with a liquid, etc. And the above main room 6
0, the sub-chamber 70 and the like must be carried out so that air bubbles (air) do not enter. It is an object (problem) of the present invention to provide a liquid-filled type vibration damping device having a small number of parts, which solves such a problem.

[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 for isolating vibrations from the vibrating body between the connecting fitting and the holder, and a holder provided in series with the insulator. And a main chamber and a sub-chamber in which an incompressible fluid (liquid) is enclosed, an orifice for communicating between the main chamber and the sub-chamber, and a partition plate provided in a lower portion of the main chamber, Regarding a liquid-filled type vibration damping device including a diaphragm or the like that partitions between the sub chamber and the air chamber, an orifice portion that forms an orifice that communicates between the main chamber and the sub chamber, and the sub chamber and the air chamber. The diaphragm part that divides the space is integrally provided with the same elastic material, and the member in which the orifice part and the diaphragm part are integrated is integrated with the partition plate. By installing the integrated member (orifice / diaphragm molded body) in the lower part of the insulator, the liquid chamber including the insulator, the main chamber and the sub chamber, and the air chamber are provided in series. I decided to take it.

[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 5 via the connecting fitting 8. As a result, the insulator 5 vibrates or displaces,
Most of the input vibration is absorbed or blocked. Therefore, most of the vibration is blocked by the insulator 5, but some of the vibration is blocked by the insulator 5.
However, it may be propagated to the vehicle body side through the holder 3 or the like without being absorbed. Therefore, in the present invention, the vibration of the component (frequency) that could not be absorbed in the insulator 5 is applied to the liquid chambers such as the main chamber 6 and the sub chamber 7 provided in the lower portion of the insulator 5, and further to the air. Room 4
It is intended to be absorbed or blocked by the action of the above. The specific operation will be described with reference to FIGS. 1 to 3.

First, in FIG. 1, vibration (displacement) from the side of a vibrating body (not shown) such as an engine is propagated to the insulator 5 via the connecting fitting 8. Then, the vibration of the component that cannot be absorbed by the portion of the insulator 5 is propagated from the lower portion of the insulator 5 to the main chamber 6 and the sub chamber 7 in which the incompressible fluid (liquid) is sealed. In that case, the vibration (displacement) propagated from the connecting fitting 8 first acts to cause the liquid in the main chamber 6 to flow. That is, it acts so as to change the volume of the main chamber 6. By this action, the liquid enclosed in the main chamber 6 does not change its volume and the orifice portion 11
Through the orifice 1 formed integrally with the diaphragm portion 12 and flows into the sub chamber 7. As a result, the volume of the sub-chamber 7 increases, the diaphragm portion 12 that partitions the sub-chamber 7 from the air chamber 4 is pushed up, and the air that is the compressive fluid in the air chamber 4 is compressed.

By going through such a series of operations, the vibration (displacement) not absorbed at the insulator 5 is absorbed. That is, when the incompressible fluid (liquid) flows in the orifice 1, a damping force for absorbing vibration is exerted, and at the same time, the volume of air that is a compressible fluid based on the deformation of the diaphragm portion 12 or the like. The dynamic spring constant is specified by the change or the like. Vibrations are absorbed and blocked by the action of these vibration systems.

In the liquid filled type vibration damping device of the present invention, first, as shown in FIG. 2, an orifice portion 11 forming an orifice 1 and a diaphragm having a conical shape in a free form (free state). An orifice / diaphragm molded body 9 in which the part 12 is integrally molded of the same material and the partition plate 2 is integrally provided by vulcanization bonding means or the like.
9, the orifice / diaphragm molded body 9
As shown in FIG. 3, the flange portion 121 provided at the tip of the diaphragm portion 12 is closely attached to the peripheral edge portion 21 of the partition plate 2, so that the partition plate 2 and the diaphragm portion 12 are connected to each other.
To form the air chamber 4, and the orifice / diaphragm molded body 9 having the air chamber 4 thus formed.
9 is installed in the lower part of the insulator 5, as shown in FIG. Therefore, the number of components is reduced, and complicated work such as mounting a partition plate or diaphragm, which has been a problem in the conventional one, and filling (filling) the non-compressible fluid into the liquid chamber are performed. It will be 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.

[0010]

Embodiments of the present invention will be described with reference to FIGS. 1, 2 and 3. As shown in FIG. 1, the configuration of the present embodiment is such that a connecting fitting 8 attached to the vibrating body side of an engine or the like, an insulator 5 integrally provided on the connecting fitting 8 by vulcanization bonding means, and the insulator 5 are provided. The fluid filled parts such as the main chamber 6, the sub chamber 7, the air chamber 4 and the like, which are provided in series in the lower part, and the fluid filled parts and the insulator 5 are integrated together and connected to a member on the vehicle body side. It is based on the holder 3 and the like.

In such a basic structure, the connecting fitting 8 is provided with a mounting bolt 85 which is a mounting portion for an engine (not shown) or the like. Further, an upper plate 82 is attached to the connecting metal fitting 8 and also serves as a rebound stopper when the engine is largely displaced.

The insulator 5 integrally connected to the connecting fitting 8 having such a structure by vulcanizing adhesive means or the like.
Is made of an elastic material such as a rubber material. In particular, in this embodiment, as shown in FIG.
The main chamber 6, the orifice 1, the sub chamber 7, the diaphragm portion 12, and the air chamber 4 are integrally formed in the lower part of the above with an elastic material such as a rubber material or EPDM.

Each of these chambers is, as shown in FIG.
An orifice portion 11 forming the orifice 1 and a diaphragm portion 12 having a conical shape in a free form (free state) are integrally formed of the same material, and the partition plate 2 is provided with a vulcanizing adhesive means or the like. As shown in FIG. 3, the orifice / diaphragm molded body 99 is integrally formed by
Flange 1 provided at the tip of diaphragm 12
21 is brought into close contact with the peripheral edge portion 21 of the partition plate 2, whereby the partition plate 2 and the diaphragm portion 12 form the air chamber 4, and the orifice / diaphragm molded body 99 having the air chamber 4 thus formed is formed. As shown in FIG. 1, it is formed by installing the lower part of the insulator 5 in series in the axial direction.

Incidentally, the main chamber 6 having the above structure.
Between the main chamber 6 and the sub chamber 7 as shown in FIG.
An incompressible fluid (liquid) -like orifice 1 capable of flowing between and is provided with an orifice portion 11 made of a rubber material or the like and a part of a diaphragm portion 12 provided via a partition plate 2. It is formed in. The orifice 1 is configured so that it can be freely selected according to the vibration system by changing the shape such as the length and diameter of the orifice portion 11. Further, by changing the shape of the diaphragm portion 12, the volume of the air chamber 4 and the sub chamber 7 can be arbitrarily changed according to the vibration system.

The insulator 5 having such a structure
The holder 3 and the holder 3 are crimped at the edge portion 91 (crimped portion) of the housing 9 that encloses the outer wall of the insulator 5, and are connected to each other, whereby the present vibration isolation device is formed. An orifice / diaphragm molded body 9 having an insulator 5 and an air chamber 4 integrated with the housing 9 is formed.
When storing 9 in the holder 3, the main chamber 6 and the sub chamber 7
A liquid-filled type vibration damping device is formed by filling (filling) a non-compressible fluid (liquid). A bolt 35 is attached to the holder 3, and the bolt 35
It is adapted to be connected to a member or the like on the vehicle body (not shown) side via the.

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 5 via the connecting fitting 8 and the cap 81. As a result, the insulator 5 vibrates or displaces to absorb or block most of the input vibration. Therefore, most of the vibration is blocked by the insulator 5, but some of the vibration may not be absorbed by the insulator 5 and may be propagated to the vehicle body side through the holder 3 and the like. is there. Therefore, in the present embodiment, the vibration of the component (frequency) that cannot be absorbed in the insulator 5 portion is caused by the action of the liquid chambers 6 and 7 and the air chamber 4 provided in the lower portion of the insulator 5, It is one that seeks to be absorbed or blocked.

That is, in FIG. 1, vibration from the side of a vibrating body (not shown) such as an engine is propagated to the insulator 5 via the connecting fitting 8 or the cap 81. Then, the vibration of the component not absorbed in the insulator 5 portion is propagated from the lower portion of the insulator 5 to the liquid chambers 6 and 7 in which the incompressible fluid (liquid) is sealed. In that case, the connecting fitting 8 or the cap 8
The vibration (displacement) propagated from 1 first acts to cause the liquid in the main chamber 6 to flow. That is, it acts so as to change the volume of the main chamber 6. Due to this action, the liquid enclosed in the main chamber 6 flows into the sub chamber 7 through the orifice 1 communicating between the main chamber 6 and the sub chamber 7 shown in FIG. As a result, the volume of the sub-chamber 7 increases, thereby compressing the air that is the compressive fluid in the air chamber 4.

By going through such a series of operations, the vibration (displacement) not absorbed at the insulator 5 is absorbed. That is, when the incompressible fluid flows in the orifice 1, a damping function for absorbing vibration is exerted, and
The dynamic spring constant is specified by the volume change of the air, which is a compressible fluid, etc. due to the deformation of the diaphragm portion 12, etc., whereby the vibration is absorbed and blocked.

[0019]

According to the present invention, a connecting fitting mounted on the side of a vibrating body, a holder mounted on a member on the vehicle body side, and an insulator for isolating vibrations from the vibrating body between the connecting fitting and the holder. A main chamber and a sub-chamber, which are provided in series with the insulator and in which an incompressible fluid (liquid) is enclosed, a partition plate provided below the main chamber, the main chamber and the sub-chamber. With respect to a liquid-filled type vibration damping device including an orifice for communicating between the main chamber and the sub chamber, and an orifice for communicating between the sub chamber and the air chamber, an orifice forming an orifice for connecting the main chamber and the sub chamber Part and the diaphragm part that divides the sub chamber from the air chamber are integrally provided by the same elastic material, and the integrated member of the orifice part and the diaphragm part is integrated with the partition plate. By installing these integrated members (orifice / diaphragm molded body) in the lower part of the insulator, the structure in which the insulator, the liquid chamber, and the air chamber are provided in series is adopted. It is now possible to absorb and block vibrations of the frequency. Further, since the anti-vibration mechanism section including a so-called fluid chamber such as a liquid chamber and an air chamber is integrally formed, the number of components as a whole is reduced, which is a problem with the conventional one. It has become possible to simplify the complicated work such as mounting the partition plate, mounting the diaphragm, and filling (filling) the incompressible fluid (liquid) in the liquid chamber. Therefore, the simplification of the assembly work including the production and management of parts can be achieved.
This makes it possible to reduce the manufacturing cost.

[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 structure of an orifice / diaphragm molded body which is a main part of the present invention.

FIG. 3 is a cross-sectional view showing a structure after an air chamber is formed by an orifice / diaphragm molded body which is a main part of the present invention.

FIG. 4 is a vertical sectional view showing the overall configuration of a conventional example.

[Explanation of symbols]

 1 Orifice 11 Orifice part 12 Diaphragm part 121 Flange part 2 Partition plate 21 Peripheral part 3 Holder 35 Mounting bolt 4 Air chamber 5 Insulator 6 Main chamber 7 Sub-chamber 8 Connecting metal fitting 81 Cap 82 Upper plate 85 Mounting bolt 9 Housing 91 Housing edge Part (crimping part) 99 Orifice / diaphragm molding

Claims (1)

[Claims] 1. A connecting metal fitting attached to a vibrating body side, a holder mounted to a vehicle body side member, an insulator for isolating vibration from the vibrating body between the connecting metal fitting and the holder, and the insulator. A main chamber and a sub chamber, which are provided in series and in which an incompressible fluid (liquid) is sealed, a partition plate provided at a lower portion of the main chamber, and the main chamber and the sub chamber are communicated with each other. An orifice,
In a liquid-filled type vibration damping device composed of a diaphragm or the like for partitioning the sub chamber from the air chamber, an orifice portion forming an orifice for communicating between the main chamber and the sub chamber, and the sub chamber and the air chamber. The diaphragm part that divides the space is integrally formed of the same elastic material, and the member in which the orifice part and the diaphragm part are integrated is integrated with the partition plate.
A diaphragm molded body) is installed in a lower portion of the insulator to provide a liquid chamber including the insulator, a main chamber and a sub chamber, and an air chamber in series. Liquid-filled anti-vibration device.