JP5265419B2 - Liquid filled vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid sealed vibration control device enhancing vibration control performance by reducing spring characteristics, especially, spring characteristics near a frequency corresponding to the idling vibration in an idle mode. <P>SOLUTION: A space 23 adjacent to a third auxiliary liquid chamber 21 with a membrane 22 between them is filled with a liquid, and this space 23 is communicated with a first auxiliary liquid chamber 12. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention includes a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, a rubber member that is disposed between these members and connects these members, and the central member and the cylindrical shape. The main liquid chamber that changes its volume according to the deformation of the rubber member accompanying relative displacement with the member, and the first film member that constitutes a part of the wall surface can be expanded and contracted by expanding and contracting according to the internal pressure. The first sub liquid chamber, the second sub liquid chamber that occupies one of the two sealed fixed spaces divided by the second membrane member, and the membrane that constitutes a part of the wall surface are expanded and contracted according to the internal pressure. A third sub liquid chamber configured to be expandable and contractable by filling the main liquid chamber and the sub liquid chamber with the liquid, and communicating the sub liquid chamber and the main liquid chamber with each other. And occupying the other of the sealed fixed spaces with a sealed air chamber. Relates to a liquid-filled vibration damping device provided with means for controlling the pressure of the air chamber.

  As shown in the schematic diagram of FIG. 1, the central member includes a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, and a rubber member that is disposed between the members and connects the members. The main liquid chamber 91 that changes its volume according to the deformation of the rubber member accompanying the relative displacement between the central member and the cylindrical member, and the first film member 93 that constitutes a part of the wall surface according to the internal pressure. A first sub-liquid chamber 92 configured to be expandable / contractable by extending and contracting, and a second sub-liquid chamber 95 occupying one of the sealed fixed spaces 85 divided into two by the second film member 96, A main liquid chamber 91 and sub liquid chambers 92, 95, 81, and a third sub liquid chamber 81 configured to be expandable / contractible by expanding / contracting a membrane 82 constituting a part of the wall surface according to the internal pressure. Filled with liquid, their secondary liquid chambers 92, 95, 81 and the main liquid chamber 1 is connected to each other so that the other of the sealed fixed space 85 is occupied by a sealed air chamber 98 and a switching valve 99 for controlling the pressure of the air chamber 98 is provided. 90 is known (for example, refer to Patent Document 1).

  Here, the main liquid chamber 91 and the first sub liquid chamber 92 communicate with each other through an orifice 94 called a shake orifice, and the vibration of the shake orifice 94 absorbs vibrations mainly due to the engine shake when the vehicle travels. On the other hand, the main liquid chamber 91 and the second sub-liquid chamber 95 are communicated with each other through an orifice 97, commonly referred to as an idle orifice, so as to absorb vibration caused by idling when the vehicle is stopped by the liquid column resonance of the idle orifice 97. It is configured.

  In the liquid-filled vibration isolator 90, when the vehicle is stopped, the switching valve 99 is operated to switch to the “idle mode” and the air chamber 98 is released to the atmosphere, whereby the second auxiliary liquid The volume of the chamber 95 can be changed, the resonance action by the idle orifice 97 is made to function, and the vibration during idling is suppressed. At this time, the volume change of the first sub-liquid chamber 92 is not suppressed, but the liquid in the main liquid chamber 91 passes through the idle orifice 97 that is tuned to absorb vibrations at a higher frequency and is second. Since the secondary liquid chamber 95 moves preferentially, the movement with the first secondary liquid chamber 92 is reduced. As a result, vibration suppression in the shake mode is suppressed, and suppression against idling vibration is dominant. . On the other hand, when the vehicle is traveling, the changeover valve 99 is operated to switch to the “shake mode” and the air chamber 98 is sealed, thereby restricting the volume change of the second sub liquid chamber 95. The movement of the liquid with the one sub liquid chamber 92 is given priority, and the suppression of shake vibration becomes dominant.

  Further, for further high frequency vibration input, neither the shake orifice 94 nor the idle orifice 97 can move the liquid sufficiently quickly. In this case, the liquid filled vibration isolator 90 is However, since the volume of the third sub-liquid chamber 81 changes due to the membrane that can be deformed in response to high speed, it is configured to have good vibration damping characteristics even for such high-frequency input.

JP 2003-222184 A

  However, in practice, for example, it has been known that a phenomenon occurs in which the spring of the vibration isolator is hardened in the vicinity of the idling resonance frequency in the state of switching to the idle mode. This means that vibration performance is not sufficient, and improvement of this point has been demanded.

  The present invention has been made in view of such problems, and is a liquid that can reduce the spring characteristics, particularly the spring characteristics in the vicinity of the frequency corresponding to the idling vibration in the idle mode, and can improve the damping performance. An object of the present invention is to provide an enclosed vibration isolator.

<1> is a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, a rubber member disposed between these members and connecting these members, and the central member and the cylinder The main liquid chamber that changes its volume according to the deformation of the rubber member accompanying relative displacement with the shaped member, and the first film member that constitutes a part of the wall surface can be expanded and contracted by expanding and contracting according to the internal pressure. The first sub-liquid chamber, the second sub-liquid chamber occupying one of the two sealed fixed spaces divided by the second membrane member, and the membrane constituting a part of the wall surface according to the internal pressure A third sub liquid chamber configured to be expanded and contracted by extending and contracting, filling the main liquid chamber and the sub liquid chamber with a liquid, and communicating the sub liquid chamber and the main liquid chamber with each other. The other of the sealed fixed space is occupied by a sealed air chamber. In the liquid-filled vibration damping device provided with means for controlling the pressure of the air chamber,
Communicating the main liquid chamber to the first sub liquid chamber via a shake orifice;
The main liquid chamber communicates with the second sub liquid chamber via an idle orifice,
Filling a space adjacent to a third secondary liquid chamber with the liquid sandwiched between the membranes and filling the liquid with the first secondary liquid chamber via a high frequency orifice Type vibration isolator.

  <2> is a liquid-filled vibration isolator comprising a switching valve that switches the air chamber pressure control means to open or seal the air chamber with respect to the atmosphere in <1>. .

  According to <1>, the space adjacent to the third auxiliary liquid chamber with the membrane interposed therebetween is filled with the liquid, and this space is communicated with the first auxiliary liquid chamber. Thus, it is possible to reduce the spring characteristics, particularly the spring characteristics in the vicinity of the frequency corresponding to the idling vibration in the idle mode.

  <2> According to <2>, the means for controlling the air pressure of the air chamber is constituted by a switching valve that switches the air chamber to be open or sealed with respect to the atmosphere, so the air pressure of the air chamber can be controlled with a simple configuration. can do.

It is a schematic diagram which shows the liquid system | strain of the conventional liquid enclosure type vibration isolator. It is sectional drawing which shows the liquid enclosure type vibration isolator of embodiment which concerns on this invention. It is a schematic diagram which shows the liquid system | strain of the liquid enclosure type vibration isolator of embodiment which concerns on this invention. It is a graph which shows the fine amplitude spring characteristic of the liquid enclosure type vibration isolator of an Example. It is a graph which shows the shake mode characteristic of the liquid enclosure type vibration isolator of an Example.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing the liquid-filled vibration isolator of the embodiment in a cross section passing through the central axis thereof, and FIG. 3 is a schematic diagram showing a liquid system of this embodiment. The liquid-filled vibration isolator 10 includes a central member 1 located at the center, a cylindrical member 2 disposed radially outward of the central member 1, and these members 1 and 2. A main liquid chamber 11 having a rubber member 3 for connecting the members 1 and 2 to each other, a volume of the main liquid chamber 11 changing according to deformation of the rubber member 3 due to relative displacement between the central member 1 and the cylindrical member 2; The first sub-liquid chamber 12 configured to be expandable / contractable by expanding / contracting the first film member 13 constituting the portion according to the internal pressure, and the sealed fixed space divided into two by the second film member 16 A second sub-liquid chamber 15 that occupies one of 25, and a third sub-liquid chamber 21 that can be expanded and contracted by expanding and contracting the membrane 22 that constitutes a part of the wall surface according to the internal pressure, The main liquid chamber 11 and their sub liquid chambers 12, 15, 21 are filled with liquid, and The secondary liquid chamber and the main liquid chamber communicate with each other so that the other of the sealed fixed space 25 is occupied by the sealed air chamber 18, and the internal pressure of the air chamber 18 is used as a means for controlling the air pressure of the air chamber 18. Is configured to be a switching valve 19 that switches to release to the atmosphere or to be sealed.

  Here, the central member 1 is connected to one of the vibration generating part and the vibration receiving part, and the cylindrical part 2 is connected to one of them. When the central member 1 and the cylindrical portion 2 are relatively displaced in accordance with the relative displacement of the vibration generating portion and the vibration receiving portion, the deformable rubber member 3 is deformed, and this deformation causes a change in volume of the main liquid chamber 11. As a result, the main liquid chamber 11 repeats the movement of liquid between the first, second, and third sub liquid chambers, but the main liquid chamber 11 and the first sub liquid chamber 12 are Since the main liquid chamber 11 and the second sub liquid chamber 15 communicate with each other by an orifice 17 called an idle orifice, the resonance of the liquid passing through the orifices 14 and 17 is established. Thus, the relative displacement of the vibration generating part and the vibration receiving part can be attenuated.

  The main liquid chamber 11 directly communicates with the third sub liquid chamber 21 for high-frequency input that cannot be attenuated by the resonance of the orifices 14 and 17. Since the membrane 22 constituting a part of the wall surface is configured to be able to be displaced in response, liquid movement can be performed between the main liquid chamber 11 and the third sub liquid chamber 21. As a result, even a high-frequency vibration input can be attenuated.

  The liquid-filled vibration isolator 10 configured as described above is characterized in that the space 23 adjacent to the third sub liquid chamber 21 with the membrane 22 interposed therebetween passes through the orifice 24 and the first sub liquid chamber 12. With this configuration, the membrane for high-frequency input is compared with the conventional configuration in which a space 23 adjacent to the third sub liquid chamber 21 is sealed with the membrane 22 interposed therebetween. The response deformation of 22 can be improved, and as a result, the spring in this frequency region can be softened, and in particular, the spring can be softened against fine vibration input in the idle mode.

  In such a liquid filled type vibration damping device 10, the switching valve 19 is operated to flow high-pressure air into the air chamber 18, and then sealed, thereby sealing the main liquid chamber 11 and the second sub-vibration device 10. The movement of the liquid between the liquid chamber 15 can be suppressed, and the vibration isolator 10 can have a characteristic that mainly attenuates the frequency region corresponding to the engine shake (shake mode). To open the air chamber 18 and make the pressure in the air chamber 18 equal to the atmospheric pressure, thereby enabling liquid movement between the main liquid chamber 11 and the second sub liquid chamber 15. The spring characteristics in the frequency domain corresponding to idling can be reduced (idle mode).

  As an example, a liquid-filled vibration isolator having the structure shown in FIG. 2 was created, and the axial relative displacement with an amplitude of ± 0.05 mm in the state switched to the shake mode and the idle mode was changed in frequency. However, it was given to the central member and the cylindrical member, and the (absolute) spring constant (K) at each frequency at that time was measured, and the result is shown in FIG. Further, the dynamic spring constant (Kd) and loss factor (tan δ) with an amplitude of ± 1 mm in the shake mode were measured in the same manner, and the results are shown in FIG.

  The above-described measurement is a liquid-filled type anti-corrosion having a structure different from that of the example only in that the space 23 adjacent to the third sub-liquid chamber 21 is sealed with the membrane 22 created as a conventional example. The vibration device was also used, and the results were displayed in accordance with FIGS.

  In FIG. 4, the vertical axis represents the reaction force by the vibration isolator per 1 mm relative displacement, and the horizontal axis represents the frequency of the input vibration. In FIG. 5, the vertical axis represents the reaction force by the vibration isolator per 1 mm relative displacement and the loss coefficient tan δ, and the horizontal axis represents the frequency of the input vibration.

  In addition, the specification of the liquid enclosure type vibration isolator used as an Example is as follows. That is, the static spring constant of this device was 320 N / mm, the outer diameter was 95 mm, the height was 105 mm, and a solenoid valve was used as the switching valve.

  As is apparent from FIG. 4, it can be seen that the spring characteristic (K) at 40 to 90 Hz, particularly when the amplitude is small, can be kept low, thereby contributing to the improvement of the vibration isolation performance in this region. Further, as is apparent from FIG. 5, it can be seen that the attenuation performance in the shake mode is not lowered.

  The liquid filled type vibration damping device according to the present invention can be used as an engine mount or body mount of an automobile.

DESCRIPTION OF SYMBOLS 1 Center member 2 Cylindrical member 3 Rubber member 10 Liquid enclosure type vibration isolator 11 1st main liquid chamber 12 1st sub liquid chamber 13 1st film member 14 (Shake) orifice 15 2nd sub liquid chamber 16 Second membrane member 17 (Idle) orifice 18 Air chamber 19 Switching valve 21 Third sub liquid chamber 22 Membrane 23 Space adjacent to third sub liquid chamber 24 Orifice 25 Sealed fixed space

Claims (2)

A central member, a cylindrical member disposed on the outer side in the radial direction of the central member, a rubber member disposed between the members and connecting the members, and the relative relationship between the central member and the cylindrical member A main liquid chamber that changes its volume according to the deformation of the rubber member accompanying the displacement, and a first auxiliary member that can be expanded and contracted by expanding and contracting the first film member that constitutes a part of the wall surface according to the internal pressure. Expansion and contraction by expanding and contracting the liquid chamber, the second sub-liquid chamber that occupies one of the two sealed fixed spaces divided by the second membrane member, and the membrane that forms part of the wall surface according to the internal pressure. A third sub-liquid chamber configured so as to be capable of filling the main liquid chamber and the sub-liquid chamber with a liquid, and communicating the sub-liquid chamber and the main liquid chamber with each other. The other side of the space is occupied by a sealed air chamber and The liquid-filled vibration damping device provided with means for controlling the chamber air pressure,
Communicating the main liquid chamber to the first sub liquid chamber via a shake orifice;
The main liquid chamber communicates with the second sub liquid chamber via an idle orifice,
Filling a space adjacent to a third secondary liquid chamber with the liquid sandwiched between the membranes and filling the liquid with the first secondary liquid chamber via a high frequency orifice Type vibration isolator.   2. The liquid-filled vibration isolator according to claim 1, wherein the means for controlling the air pressure of the air chamber is constituted by a switching valve that switches the air chamber to be open or sealed with respect to the atmosphere.

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