JPH07301277A - Liquid-sealed type vibration control device - Google Patents

Abstract

PURPOSE:To cause a liquid-column resonance to a high-frequency vibration, forming a low-motion spring characteristics as well as to form a high damoing characteristic by means of flow resistance in an orifice to a low-frequency vibration, respectively. CONSTITUTION:A movable part 1 integrally formed with an upper connecting fitting 7 is installed in a main chamber 81. This movable part 1 consists of a rod 12, a disk part 11, a flange part 19, a piston 15 or the like, In addition, linkage 5 consisting of a lever 3 or the like to be engaged with the flange part 19 of this movable part 1. A cylinder part 85 with an intake port 89 being opened in the main chamber 81, while the piston 15 is inserted into, is installed therein. This cylinder part 85 is connected to an orifice 88 which is, in turn, connected to a sub-chamber 82. With this constitution, a low-motion spring constant is formed against a close noise, whereby a vibration is interrupted. Likewise, a high damping characteristic is formed against a engine shake, whereby the vibration is checked.

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 isolator, and in particular, a vibration input (disturbance) from a vibrating body side is transmitted to an insulator side via a link mechanism, and thereby specified. It suppresses the pressure rise in the liquid chamber in the frequency range, thus forming a low dynamic spring characteristic (low dynamic spring constant), and a high damping characteristic in a specific frequency range due to the action of the piston that works in conjunction with the link mechanism. The present invention relates to a liquid-filled type vibration damping device.

[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. Because it is used, it must be able to handle a wide range of frequencies. In general, a vibration control device as an engine mount is designed for idling vibration, which is targeted for torque fluctuations due to explosive combustion of the engine.
Alternatively, the system is set (tuned) for the purpose of isolating vibrations such as engine shake that causes the engine to resonate due to vibrations transmitted from the suspension mechanism. In recent years, engine mounts have been tuned for the purpose of blocking muffled noise associated with vibrations of relatively high frequencies of about 100 Hz to 600 Hz. In order to meet such a plurality of conditions, a so-called voice coil type in which a liquid chamber is provided inside, and further a vibrator including a voice coil that vibrates at a specific frequency is provided inside the liquid chamber The liquid-filled type vibration damping device has already been devised, and is known from, for example, Japanese Patent Laid-Open No. 5-99262.

[0003]

By the way, in this one, a voice coil composed of an electromagnet or the like is provided in the liquid chamber, and the voice coil is targeted for a specific frequency for idling vibration or vibration for muffled sound. By vibrating (exciting) a specific frequency such as a specific frequency, the liquid column resonance is caused in the liquid chamber. By this liquid column resonance phenomenon, a low dynamic spring constant (low dynamic spring characteristic) is formed, and by the action of this low dynamic spring characteristic, the vibration related to the muffled sound is cut off. Further, for low-frequency vibrations such as engine shake, high damping characteristics can be obtained by increasing the amount of liquid flowing to the orifice. However, this one
In the case of an anti-vibration device, the installation of a voice coil and the installation of a complicated mechanism are required, and the entire device becomes large-scale, resulting in an increase in weight (mass) or an increase in manufacturing cost. Have a point. In order to solve such a problem, a liquid filled type vibration damping device is provided which has a low dynamic spring characteristic and a high damping characteristic with a simple link mechanism without using an expensive voice coil or the like. It is an object (problem) of the present invention to be made.

[0004]

In order to solve the above-mentioned problems, the following measures are taken in the present invention. That is, an upper connecting fitting connected to the vibrating body side,
A holder connected to a member or the like on the vehicle body side, an insulator provided between the upper connecting fitting and the holder for blocking vibration from the vibrating body, provided in series with the insulator, and having incompressibility. A main chamber and a sub chamber in which a fluid (liquid) is enclosed, a partition plate for partitioning the main chamber and the sub chamber, an orifice for circulating a liquid between the main chamber and the sub chamber, air, etc. A liquid-filled type vibration damping device including an air chamber into which a compressive fluid is introduced and a diaphragm or the like that partitions the air chamber from the sub-chamber, and is integrally formed with the upper coupling fitting in the main chamber. To be rod,
A movable portion including a disc portion formed at the tip portion of the rod and a piston formed in the central portion of the disc portion is provided, and the upper connecting fitting operates so as to reduce the volume of the main chamber. When (displaced), the insulator is deformed (displaced) according to the operation so as to increase the volume in the main chamber, while the upper coupling fitting operates so as to expand the volume in the main chamber ( When displaced), a link mechanism that deforms (displaces) the insulator so as to reduce the volume of the main chamber is provided,
Furthermore, while being formed continuously in the orifice,
It is assumed that a cylinder portion having an inlet is provided on the main chamber side.

A cushion made of a rubber material or the like is provided on the lower surface side of the disk portion forming the movable portion, and the tip of the piston provided at the center of the disk portion is made of an elastic body made of a rubber material or the like. On the other hand, the introduction port of the cylinder portion into which the piston is inserted has a divergent funnel shape.

[0006]

By adopting the above construction, the following effects are exhibited in the present invention. That is, the vibration from the vibrating body side is propagated to the insulator 2 made of a vibration-proof rubber or the like through the upper connecting fitting 7 as shown in FIG. As a result, the insulator 2 vibrates or displaces to absorb and block most of the input vibration. Therefore, most of the vibrations are blocked at the insulator 2, but some of the vibrations, such as vibrations related to muffled noise, are not absorbed at the insulator 2 and are propagated to the holder 9 or the like. There is a risk. With respect to vibrations that cannot be absorbed at the insulators 2, the liquid in the main chamber 81 resonates (liquid column resonance) to form a low dynamic spring constant, or the liquid flows from the cylinder portion 85 into the orifice 88. The high damping characteristics are formed by causing the fluid to flow, so that the vibrations can be absorbed and blocked. The operation of liquid resonance (liquid column resonance) and the like will be described below.

First, when the upper coupling member 7 vibrates due to the vibration from the vibrating body, this vibration vibrates (displaces) the rod 12 integrally provided on the upper coupling member 7. In this case, the vibration (displacement) of the rod 12 is in phase with the input vibration from the vibrating body.
Further, the displacement is further propagated to the insulator 2 via the link mechanism 5 including the lever 3 and the like engaged with the movable portion 1. Specifically, when the rod 12 provided in the lower portion of the upper coupling member 7 moves (displaces) downward, the lever 3 operates according to the displacement, and operates to expand the insulator 2. To do. Also, when the rod 12 moves upward (displaces), in response to this,
The insulator 2 is displaced (deformed) so as to shrink.

That is, when the upper connecting fitting 7 is operated (displaced) so as to reduce the volume in the main chamber 81 formed in the lower portion of the upper connecting fitting 7, the link mechanism 5 is interlocked with this. The insulator 2 is operated to displace (deform) the insulator 2 so as to increase the volume in the main chamber 81. On the contrary, when the upper connection fitting 7 is operated (displaced) so as to increase the volume in the main chamber 81, the link mechanism 5 is operated accordingly and the main chamber 81 is moved. The insulator 2 is displaced (deformed) so as to reduce the internal volume.

With respect to the vibration of a specific frequency, for example, the vibration of muffled sound, by the series of operations described above, the liquid in the main chamber 81 is caused to resonate in liquid according to the input vibration, and the rise of the hydraulic pressure is suppressed. There is. As a result, a low dynamic spring constant (low dynamic spring characteristic) is formed for vibration of a specific frequency. Then, due to the action of the low dynamic spring characteristic, the muffled sound is cut off.

Next, since it is difficult to cut off the vibration of an engine shake having a relatively low frequency (about 10 Hz) by forming a low dynamic spring constant, the damping coefficient should be increased. To suppress the vibration. Specifically, in FIG. 1, when the upper connecting fitting 7 vibrates due to vibration from the vibrating body side, the movable portion 1 provided integrally with the upper connecting fitting 7 also vibrates. Then, due to this vibration, the disk portion 11 and the piston 15 that form a part of the movable portion 1 also operate. As a result, a large amount of liquid is introduced into the introduction port 89 and the cylinder portion 85 provided at the position facing the piston 15 and the like. Then, the liquid is sent to the orifice 88 communicating with the cylinder portion 85. That is, a large amount of the liquid in the main chamber 81 flows through the orifice 88, so that high damping characteristics are formed. Due to the action of this high damping characteristic, low-frequency (about 10 Hz) vibration related to the engine shake is suppressed and absorbed.

[0011]

EXAMPLE An example of the present invention will be described with reference to FIG. The configuration of the present embodiment has an upper connecting fitting 7 that is connected to a vibrating body side (not shown) of an engine or the like via a bracket or the like.
A holder 9 attached to a member or the like on the vehicle body side; and an insulator 2 between the upper connecting fitting 7 and the holder 9 for absorbing and blocking most of the vibration from the vibrating body; A main chamber 8 that is provided in series with the liquid and is filled with a liquid that is an incompressible fluid
1 and the sub-chamber 82, a partition plate 8 for partitioning the main chamber 81 and the sub-chamber 82, an orifice 88 for circulating a liquid between the main chamber 81 and the sub-chamber 82, and a compressible fluid such as air. It is basically composed of an air chamber 45 into which the air is introduced, and a diaphragm 4 that partitions the air chamber 45 and the sub chamber 82.

In such a basic structure, the movable portion 1 which operates integrally with the upper connecting fitting 7 is provided on the lower side of the upper connecting fitting 7 facing the main chamber 81. It consists of a structure. This movable part 1
Is a rod 12 provided on the lower surface of the upper connecting fitting 7.
And the disc portion 1 provided at the tip of the rod 12.
1, a flange portion 19 formed at the tip of the disc portion 11 and engaged with the link mechanism 5 described later, and a cushion 1 made of an elastic body provided on the lower surface of the disc portion 11.
3 and a piston 15 provided at the center of the disc portion 11. In addition, this piston 1
The tip of 5 is formed of an elastic body such as a rubber material. The cushion 13 is made of a rubber material or the like, and serves as a cushioning material when the lower surface of the disk portion 11 comes into contact with an introduction port 89 described later.

From the edge of the upper connecting fitting 7,
An insulator 2 made of a vibration-proof rubber material or the like is provided in a cone shape toward the lower portion thereof, and a holder 9 is provided in a lower portion of the insulator 2 that expands in the cone shape. Is. A plate 21 that engages with the tip portion 33 of the lever 3 of the link mechanism 5 described later is provided on the inner wall side of the insulator 2 provided in the cone shape. The plate 21 has a conical shape, and the tip end 33 of the lever 3 is actuated to uniformly deform (displace) the cone-shaped insulator 2 over the entire circumference thereof. There is something. Therefore, the number of divisions (state) is set according to the number of the levers 3 installed. That is, in this embodiment, as shown in FIG. 1, since it is composed of two levers, the plate 21 is also divided into two parts. A main chamber 81 is formed by the upper connection fitting 7, the cone-shaped insulator 2, the partition plate 8 and the like.

In the main chamber 81 having these structures, the front end of the flange portion 19 forming a part of the movable portion 1 is engaged, and the operation (displacement) of the movable portion 1 is directed to the insulator 2 side. The link mechanism 5 for transmitting is provided. Specifically, as shown in FIG. 1, the link mechanism 5 has a support member 6 provided on the partition plate 8 and a fulcrum (O ₆ ) provided near the upper end of the support member 6 as a center. And a lever 3 rotatably attached thereto. Then, the lever 3 is
One end thereof contacts (engages) with the tip of the flange portion 19
In addition, the other end comes into contact (engagement) with the conical plate 21 provided on the inner wall of the insulator 2.

The lever ratio (A / B) of the lever 3 is
The insulator 2 can be appropriately selected, and the insulator 2 can be deformed (displaced) based on the vibration (displacement) of the movable portion 1, and the ratio thereof can be adjusted. Is. That is, the rate of change of the volume in the main chamber 81 can be adjusted appropriately. This makes it possible to appropriately select the frequency at which the liquid column resonance should occur with respect to the input vibration. Therefore, if the frequency (frequency) of the target muffled sound differs depending on the type of vibration system, the A / B
By appropriately adjusting the value of, it is possible to tune to an optimum state.

A communication port 9 is provided in a part of the holder 9.
1 is provided so that the atmosphere (air) is introduced into the air chamber 45 through the communication port 91 in response to the operation of the diaphragm 4 forming a part of the air chamber 45. It has become. Therefore, even when the vibration isolator is installed as an engine mount or the like from a free state (no load state) and a predetermined weight (mass) is loaded, the inside of the main chamber 81 is slightly increased. The volume of the main chamber 81 is absorbed by the deformation of the diaphragm 4 and the volume change of the air chamber 45.
It has no effect on the internal fluid pressure. That is, the dynamic spring constant does not change.

The cylinder portion 85, into which the piston 15 provided in the movable portion 1 having the above-mentioned structure is inserted, has the main chamber 8
1 is connected to an orifice 88 that communicates between the auxiliary chamber 82 and the auxiliary chamber 82, and one end of the orifice 88 is open to the main chamber 81 side. In addition, as shown in FIG. 1, an inlet 89 having a funnel-shaped (trumpet-shaped) shape that widens upward toward the end is provided in the portion that opens toward the main chamber 81. It will be.
As a result, when the movable part 1 operates (vibrates),
Even if the piston 15 provided in the movable portion 1 makes a swinging motion or the like, the piston 15 will be smoothly inserted into the introduction port 89 of the cylinder portion 85. That is, in addition to the fact that the tip portion of the piston 15 is formed of an elastic body such as a rubber material, the piston 1
5 and the inlet 89 of the cylinder portion 85, even if some twisting (interference) occurs, there is no problem in introducing the liquid into the cylinder portion 85 and the orifice 88. It is what

The operation mode and the like of this embodiment having these configurations are the same as those already described in the section of the above operation.

[0019]

According to the present invention, the upper connecting fitting connected to the vibrating body side, the holder connected to the member on the vehicle body side, and the upper connecting fitting and the holder are connected to each other from the vibrating body. An insulator that isolates vibration, a liquid chamber that is provided in series with the insulator and that is filled with an incompressible fluid (liquid), an air chamber into which a compressible fluid such as air is introduced, and the air chamber. Regarding a liquid-filled type vibration damping device composed of a diaphragm or the like for partitioning between the liquid chamber and the liquid chamber, vibration (displacement) of the upper coupling fitting in the liquid chamber
Is transmitted in the same phase, and when the upper connecting fitting is operated (displaced) so as to reduce the volume in the liquid chamber, the insulator is deformed (displaced so as to increase the volume in the liquid chamber). Since the configuration is such that a link mechanism that changes the volume of the liquid chamber in accordance with the operation of the upper connecting fitting is provided, the vibration from the vibrating body side enters the liquid chamber via the upper connecting fitting. Even if it is transmitted, the operation of the link mechanism does not cause an extreme increase in the liquid pressure in the liquid chamber. That is, the operation of the link mechanism causes the liquid in the liquid chamber to resonate in the liquid column in phase with the input vibration, thereby forming a low dynamic spring constant (low dynamic spring characteristic) with respect to vibration of a specific frequency. Is now possible. Therefore, due to the action of the low dynamic spring characteristic, it is possible to cut off a specific frequency, for example, vibration such as muffled sound.

In addition, a piston that operates (vibrates) integrally with the upper connecting fitting is provided in the liquid chamber.
Since the liquid in the liquid chamber is introduced along with the operation (vibration) of the piston, and the cylinder portion for introducing the introduced liquid into the orifice is provided, a low frequency (about 10 Hz) ) Vibration of the engine shake input, it becomes possible to pump a large amount of liquid into the orifice by the interaction between the piston and the cylinder portion, thereby forming a high damping characteristic. Due to the action of the high damping characteristic, it becomes possible to suppress the vibration related to the engine shake.

Further, in the present invention, an expensive voice coil or the like is not required to cause liquid column resonance,
Since it becomes possible to resonate the liquid column with a simple link mechanism, it becomes possible to deal with vibration at a low cost when shutting off vibrations such as muffled noise.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Movable part 11 Disc part 12 Rod 13 Cushion 15 Piston 19 Flange part 2 Insulator 21 Plate 3 Lever 31 End part 33 Tip part 4 Diaphragm 45 Air chamber 5 Link mechanism 6 Supporting member 7 Upper connection metal fittings 8 Partition plate 81 Main chamber 82 Secondary Chamber 85 Cylinder part 88 Orifice 89 Inlet port 9 Holder 91 Communication port

Claims (3)

[Claims] 1. An upper connecting fitting connected to the vibrating body side,
A holder connected to a member or the like on the vehicle body side, an insulator provided between the upper connecting fitting and the holder for blocking vibration from the vibrating body, provided in series with the insulator, and having incompressibility. A main chamber and a sub-chamber in which a fluid (liquid) is enclosed, a partition plate for partitioning the main chamber and the sub-chamber, an orifice for allowing liquid to flow between the main chamber and the sub-chamber, and compression such as air In a liquid-filled type vibration damping device including an air chamber into which a sexual fluid is introduced and a diaphragm or the like that partitions the air chamber from the sub chamber, the vibration damping device is integrally formed with the upper coupling fitting in the main chamber. And a link mechanism that operates via the movable part and that expands and contracts the volume in the main chamber. Further, the movable part is provided with a piston. Together with the inlet port at a position toward the liquid-filled vibration damping device characterized by comprising the structure was the provision of the cylinder portion which is formed continuously to the orifice. 2. The liquid-filled type vibration damping device according to claim 1, wherein the tip end portion of the piston is formed of an elastic body, and the introduction port of the cylinder portion into which the piston is inserted has a flared shape. A liquid-filled type vibration damping device, characterized in that it is configured to be formed in. 3. The liquid-filled type vibration damping device according to claim 1, wherein a rod integrally formed with the upper connection fitting, a disc portion formed at a tip portion of the rod, and the disc in the main chamber. A movable part formed of a piston or the like provided in the central part of the part is provided to operate in conjunction with the movable part, and one end of the disk part that forms the movable part engages with the distal end of the disk part. A liquid-filled type vibration damping device, characterized in that the other end is engaged with the inner wall side of the insulator, and a link mechanism composed of a lever rotatably attached to the support member is provided.