JP2601594Y2 - Anti-vibration 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 vibration isolator for supporting a vibrating body such as an engine of an automobile in a vibration isolating manner, and more particularly to a liquid filled type vibration isolator in which a liquid is sealed therein.

[0002]

2. Description of the Related Art Generally, an automobile engine has a large amplitude (± 0.25 m) when idling.
m) Since vibrations of small amplitude (± 0.05 mm) are generated during traveling, there is a strong demand for a vibration isolator capable of effectively damping those vibrations. In particular, traffic jam if the Japan traffic conditions which frequently occurs, the idling vibration of large amplitude (20~30H _Z), it is important to completely remove shock vibration (about 10H _Z) during travel problems It has become.

[0003] As a vibration damping device for attenuating such vibration, for example, a vibration damping device disclosed in Japanese Utility Model Publication No. 1-37966 is known, and this vibration damping device is a so-called liquid-filled type. Vibration damping device, wherein the input vibration is attenuated by utilizing the liquid column resonance when the liquid moves between the main liquid chamber and the sub liquid chamber via the orifice. It is.

However, in such a vibration isolator, since one main orifice communicates with the main liquid chamber and the sub liquid chamber, only one type of resonance frequency is set by the orifice. Can not. Therefore, it was not possible to satisfy both the high damping at the time of the shock vibration input and the low dynamic spring at the time of the idle vibration input, and it was inevitable that one of the vibrations was transmitted to the vehicle body side. .

On the other hand, as a vibration isolator which has solved the above problems, for example, a vibration isolator disclosed in US Pat. No. 5,178,373 is already known. Since two orifices communicate with the auxiliary liquid chamber, the resonance frequency of one orifice can be adjusted to shock vibration, and the resonance frequency of the other orifice can be adjusted to idle vibration. Both the damping and the low dynamic spring at the time of inputting the idle vibration can be satisfied at the same time, and both vibrations can be effectively damped.

However, in such a vibration isolator, since the number of constituent parts and the number of vulcanized products are large, it takes time and effort to manufacture individual parts and also to assemble them. There is a problem that the cost increases as a whole.

This invention solves the above-mentioned problems of the prior art, and can simultaneously satisfy both high damping during shock vibration input and low dynamic spring during idle vibration input. It is another object of the present invention to provide an anti-vibration device capable of reducing the number of components and the number of vulcanized products and significantly reducing manufacturing costs.

[0008]

This invention is to solve the above problems In order to solve the problems], an elastic body to form a vulcanized molded to vulcanized molded on the outer peripheral surface of the inner cylinder, said vulcanization between the fitted outer tube and vulcanized molding and the outer tube to the outer circumferential surface of the body, the first orifice and the first liquid chamber to vary the pressure by the vibration inputting, to the first liquid chamber And a sub-diaphragm that is displaced in response to changes in internal pressure.
A second liquid chamber having a section, communicated with via a second orifice into said second liquid chamber, through the sub-diaphragm is partitioned with the second liquid chamber, and the change in the internal pressure
And a third liquid chamber partially having a diaphragm that is displaced in accordance with the pressure, and the second orifice is added to the liquid in the first orifice or the first orifice in response to input vibration . Liquid in a series of orifices resonates
The means configured as described above is employed.

[0009]

According to the present invention, when the above-mentioned means is adopted, for example, when an idle vibration is input, the internal pressure of the first liquid chamber increases, and the liquid in the first liquid chamber passes through the first orifice. The liquid flows into the second liquid chamber, the internal pressure of the second liquid chamber rises, and the increase in the internal pressure is transmitted to the third liquid chamber through the sub-diaphragm, and the diaphragm is moved through the liquid in the third liquid chamber. Transmitted to and absorbed. At this time, the liquid in the first orifice communicating between the first liquid chamber and the second liquid chamber resonates, and a low dynamic spring is obtained. Also, when shock vibration is input, the liquid moves to the second liquid chamber via the first orifice, and the second liquid chamber raises the internal pressure. The amplitude of this vibration is smaller than that of the idle vibration. Therefore, the portion that cannot be completely absorbed by the sub-diaphragm alone and cannot be completely absorbed flows from the second liquid chamber into the second orifice, flows there, moves to the third liquid chamber, and moves inside the third liquid chamber. Acts on the diaphragm via the liquid and is absorbed. At this time, the liquid in the series of orifices in which the second orifice is added to the first orifice resonates, and high attenuation is obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 4 show an embodiment of the vibration isolator according to the present invention. FIG. 1 is a perspective view showing the whole, FIG. 2 is a right side view of the one shown in FIG. 1, and FIG. 1 is a left side view, and FIG. 4 is a cross-sectional view of the one shown in FIG.

That is, the vibration isolator shown in this embodiment is
An inner cylinder 1 having a substantially triangular cross-section and a mounting hole 1a formed at a position slightly deviated from the center of the cross-section. A cylindrical outer ring 2 having first and second grooves 2a and 2b formed at appropriate depths over substantially the entire circumference at both ends in the axial direction, with the centers thereof aligned; A vulcanized molded body 4 comprising an elastic body 3 integrally connecting the ring 2 and the inner cylinder 1 to a desired shape by vulcanization molding or the like;
An outer cylinder 11 fitted to the outer peripheral side of the vulcanized molded body 4 is provided.

An elastic body 3 of the vulcanized molded body 4 extends radially outward in an eight-shape around the inner cylinder 1 and has a leg portion 5 for elastically supporting the outer ring 2 with the outer ring 2. 5 and
A space between the circumferential ends on the upper surface side of the legs 5, 5
A thin diaphragm 6 which is integrally connected to the upper surface with a predetermined gap formed therebetween and which can be displaced inward and outward in the radial direction.

A first concave portion 7 having an appropriate depth is formed on the lower surface side of the leg portions 5, 5, and the leg portions 5, 5
A second recess 8 having an appropriate depth is formed on the side surface of
Further, a third concave portion 9 having an appropriate depth is formed on the upper surface side of the leg portions 5, 5. The first recess 7 and the second recess 8 communicate with each other via the first groove 2a, and the second recess 8 and the third recess 9 communicate with each other. The two grooves 2a and 2b are connected to each other via the second groove 2b, and these two grooves 2a and 2b are arranged in series with the second recess 8 interposed therebetween. Further, the space between the second recess 8 and the third recess 9 is partitioned by a thin-film-shaped sub-diaphragm 10.

Then, the vulcanized molded article 4 constructed as described above is positioned in a liquid, and the outer cylinder 11 is attached to the outer peripheral surface of the vulcanized molded article 4.
By fitting, the first liquid chamber 12 is provided in a portion corresponding to the first recess 7 between the vulcanized molded body 4 and the outer cylinder 11.
A second liquid chamber 13 is provided in a portion corresponding to the second recess 8.
A third liquid chamber 1 in a portion corresponding to the third recess 9.
4 are respectively formed, and a first orifice 15 communicating between the first liquid chamber 12 and the second liquid chamber 13 at a portion corresponding to the first groove 2a is formed by the second orifice. A second orifice 16 communicating between the second liquid chamber 13 and the third liquid chamber 14 is formed at a portion corresponding to the groove 2b, and a first orifice 15 and a second orifice 1 are formed.
6 is a series with the second liquid chamber 13 interposed therebetween.

Next, the operation of the above-described device will be described. First, the inner cylinder 1 of the vibration isolator constructed as described above is connected to the engine side through a mounting hole 1a, and the outer cylinder 11 is connected to the vehicle body through a bracket (not shown) or the like. When the engine is operated, various vibrations are input to the inner cylinder 1 from the engine.

For example, when the vibration input from the engine is an idle vibration of 20 to 30 Hz, the vibration causes the inner cylinder 1 and the outer cylinder 11 to move radially inward and outward through the elastic body 3. , The internal pressure of the first liquid chamber 12 rises, and the liquid in the first liquid chamber 12 flows into the first orifice 15, flows there, and moves to the second liquid chamber 13. Then, while the internal pressure of the second liquid chamber 13 changes, the sub-diaphragm 10 is displaced in accordance with the change of the internal pressure of the second liquid chamber 13, and the displacement of the sub-diaphragm 10 is transmitted through the third liquid chamber 14. To the diaphragm 6,
The displacement of the diaphragm 6 absorbs a change in the internal pressure of the second liquid chamber 13.

A low dynamic spring is obtained by the liquid column resonance of the liquid located in the first orifice 15 in such a process, and the idle vibration in this frequency range can be effectively attenuated.

On the other hand, when the input vibration is a shock vibration of about 10 Hz, the change in the internal pressure of the second liquid chamber 13 cannot be absorbed only by the displacement of the sub-diaphragm 10 and cannot be completely absorbed. Minutes from the second liquid chamber 13 to the second
Flows into the orifice 16, flows therethrough and moves to the third liquid chamber 14. Then, while the internal pressure of the third liquid chamber 14 changes, the diaphragm 6 is displaced in accordance with the change of the internal pressure of the third liquid chamber 14, whereby the displacement that cannot be completely absorbed by the displacement of the sub-diaphragm 10. Second liquid chamber 13
The change in internal pressure is absorbed.

In such a process, high attenuation is obtained by the liquid column resonance of the liquid located in a series of orifices obtained by adding the second orifice 16 to the first orifice 15, and shock vibration in this frequency range is reduced. It can be attenuated effectively.

As described above, in the vibration isolator according to this embodiment, the elastic body 3 is vulcanized and formed into a desired shape on the outer peripheral surface of the inner cylinder 1 to form a vulcanized formed body 4 having a desired shape. At the same time, the outer cylinder 11 is fitted on the outer peripheral surface of the vulcanized molded body 4, and the first liquid chamber 12, the second liquid chamber 13, and the third liquid chamber 13 are provided between the vulcanized molded body 4 and the outer cylinder 11. , A first orifice 15 connecting the first liquid chamber 12 and the second liquid chamber 13, and a second orifice 1 connecting the second liquid chamber 13 and the third liquid chamber 14.
6 are formed, and the second liquid chamber 13 and the third liquid chamber 14 are partitioned by the sub-diaphragm 10, and a part of the third liquid chamber 14 is formed by the diaphragm 6. Because of the structure, the number of components and the number of vulcanized products can be reduced.

Therefore, the labor required for processing and assembling can be greatly reduced, and the manufacturing cost can be significantly reduced.

Also, since there are two orifices, the first orifice 15 and the second orifice 16, the resonance frequency of one orifice is adjusted to shock vibration and the resonance frequency of the other orifice is adjusted to idle vibration. Thus, both high damping at the time of shock vibration input and low dynamic spring at the time of idle vibration input can be obtained.
Therefore, it is possible to greatly increase the damping property for the input vibration.

[0023]

[Effect of the Invention] As described above, this invention is based on the outer peripheral surface of the inner cylinder.
Vulcanization of an elastic body to form a vulcanized molded body
The outer cylinder is fitted to the outer peripheral surface of the vulcanized molded
A first liquid chamber, a second liquid chamber, a third liquid chamber,
Having <br/> configured to form a first orifice and the second orifice, so that it is possible to reduce the number of number of components and vulcanized product. Thus, processing, and labor required for assembling can be significantly reduced, so that it is possible to greatly reduce the manufacturing cost. In addition, three liquid chambers of a first liquid chamber, a second liquid chamber, and a third liquid chamber are provided.
As well as, through communication between the first liquid chamber and the second liquid chamber
That have the two orifices of the second orifice communicating between the first orifice and the second liquid chamber and the third liquid chamber
And, and, since they have Daiafura <br/> arm constituting a part of the sub-diaphragm and the third liquid chamber partitioning the second liquid chamber and the third liquid chamber, for example, the first The orifice resonance frequency is adjusted to idle vibration, and the resonance frequency of a series of orifices obtained by adding a second orifice to the first orifice is adjusted to shock vibration. Both high attenuation in time will be obtained. Therefore, the present invention has an excellent effect that the damping property for the input vibration can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire embodiment of a vibration isolator according to the present invention.

FIG. 2 is a right side view of the one shown in FIG.

FIG. 3 is a left side view of the one shown in FIG. 1;

FIG. 4 is a cross-sectional view of the one shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner cylinder 1a ... Mounting hole 2 ... Outer ring 2a ... 1st groove part 2b ... 2nd groove part 3 ... Elastic body 4 ... Vulcanized molded body 5 ... Leg part 6 ... ... diaphragm 7 ... first depression 8 ... second depression 9 ... third depression 10 ... sub-diaphragm 11 ... outer cylinder 12 ... first liquid chamber 13 ... second Liquid chamber 14 Third liquid chamber 15 First orifice 16 Second orifice

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-1644831 (JP, A) JP-A-4-25637 (JP, A) JP-A-2-203039 (JP, A) 31796 (JP, Y2) US Pat. No. 5,178,373 (US, A) US Pat. No. 5,082,702 (US, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 13/14 B60K 5/12

Claims (1)

(57) [Scope of request for utility model registration] An elastic body on the outer peripheral surface according to claim 1] in the tube to form a vulcanized molded to vulcanized molded, fitted outer tube and vulcanized molding and outside the outer peripheral surface of the vulcanized molding between the cylinder, and the first liquid chamber to vary the pressure by the vibration inputting, communicated with via a first orifice in said first liquid chamber, the internal pressure
Having a sub-diaphragm is displaced in response to changes in some
A second liquid chamber that, communicated with via a second orifice into said second liquid chamber, wherein the compartment and the second liquid chamber via the sub-diaphragm, and in response to changes in the internal pressure
A third liquid chamber partially including a displaceable diaphragm ; and a third liquid chamber in the first orifice in response to input vibration .
The liquid or the liquid in the series of orifices obtained by adding the second orifice to the first orifice is configured to resonate.
An anti-vibration device characterized by being made.