JP2011163446A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely damp and absorb a plurality of types of vibrations differed in frequency band by switching the resonance frequency of a limiting passage according to the frequency of an input vibration. <P>SOLUTION: The vibration control device includes an elastic body which mutually connects a cylindrical first attachment member to a second attachment member; and a partition member 8 which divides a liquid chamber inside the first attachment member sealed with a liquid into a main liquid chamber on one side and a sub-liquid chamber on the other side. The partition member 8 includes limiting passages 70, 71 which allow the main liquid chamber to communicate with the sub-liquid chamber, and cause a liquid column resonance upon input of a vibration to damp and absorb the vibration; a switching means 72 which switches the resonance frequency of the limiting passages 70, 71; a connecting path 74 which connects the main liquid chamber to the sub-liquid chamber; a hydraulic pressure inlet path 47 which communicates with the connecting path 74, and introduces the hydraulic pressure within the connecting path 74 into the switching means 72 to operate the switching means 72; and a thin film body 73 which is disposed inside the connecting path 74 to interrupt the communication between the main liquid chamber and the sub-liquid chamber through the connecting path 74. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator that is applied to, for example, automobiles, industrial machines, and the like and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

Conventionally, as this type of vibration isolator, for example, as shown in Patent Document 1 below, a cylindrical first mounting member connected to either one of a vibration generating unit and a vibration receiving unit, and the other is used. A second mounting member to be connected; an elastic body that elastically connects the first mounting member and the second mounting member; a liquid chamber in the first mounting member in which a liquid is sealed; And a partition member that is divided into a main liquid chamber on one side and a sub liquid chamber on the other side. In this vibration isolator, the partition member is connected to the main liquid chamber and the sub liquid chamber and the liquid flows to cause liquid column resonance, and a plurality of restriction passages having different resonance frequencies and the liquid flow And switching means for switching the restriction passage to be provided.
By the way, for example, idle vibration having a high frequency and shake vibration having a low frequency are input to this type of vibration isolator. In order to reliably attenuate and absorb multiple types of vibrations with different frequency bands, there is a restriction that the liquid circulates so that liquid column resonance occurs in the restriction passage of the resonance frequency corresponding to the input vibration frequency. It is desired to switch the passage with high accuracy in accordance with the input vibration frequency.
Here, since the amplitude of the shake vibration is larger than the amplitude of the idle vibration, a large fluid pressure fluctuation (fluid pressure amplitude) occurs in the main fluid chamber when the shake vibration is input. Therefore, in the conventional vibration isolator, the switching means is configured to switch the restriction passage through which the liquid flows in accordance with the fluid pressure fluctuation in the main fluid chamber. Thereby, the restriction | limiting channel | path which a liquid distribute | circulates can be switched at the time of the input of the shake vibration whose frequency is lower than an idle vibration.

Japanese Patent Laid-Open No. 2004-3615

  However, in the conventional vibration isolator, even in the case of shake vibration, when the amplitude is relatively small, the liquid pressure in the main liquid chamber may not fluctuate greatly to the extent that the switching means is operated. There is a risk that it is difficult to switch the restricted passage through which the circulates.

  The present invention has been made in view of the above-described circumstances, and the object thereof is to switch the resonance frequency of the restriction passage according to the frequency of the input vibration, and to reliably prevent a plurality of types of vibrations having different frequency bands. An object of the present invention is to provide a vibration isolator capable of absorbing and absorbing.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, a second mounting member connected to the other, and the first mounting. An elastic body that elastically connects the member and the second mounting member; a liquid chamber in the first mounting member in which a liquid is sealed; a main liquid chamber on one side having the elastic body as a part of a wall surface; A liquid-sealed vibration isolator having a partition member that divides into a secondary liquid chamber on the other side, wherein the partition member communicates the main liquid chamber and the secondary liquid chamber with respect to an input of vibration. A restriction passage that generates liquid column resonance and attenuates and absorbs vibration; a switching unit that switches a resonance frequency of the restriction passage; a connection path that connects the main liquid chamber and the sub liquid chamber; A hydraulic pressure introducing path for introducing the hydraulic pressure in the connecting path into the switching means and operating the switching means; Characterized in that it and a thin film body to block the communication between the main liquid chamber and the auxiliary liquid chamber is disposed in the connecting passage through the connection path.

According to this invention, since the thin film body blocks communication between the main liquid chamber and the sub liquid chamber through the connection path, the thin film body is elastically deformed by the vibration input to the vibration isolator and connected. When liquid column resonance occurs in the path, the liquid pressure in the connection path greatly fluctuates. That is, the hydraulic pressure in the connection path fluctuates according to the frequency of vibration input to the vibration isolator, and the hydraulic pressure is introduced into the switching means through the hydraulic pressure introduction path, and the switching means is operated, so that the restriction The resonance frequency of the passage is switched.
Accordingly, since the resonance frequency of the restriction passage is switched according to the vibration frequency input to the vibration isolator, a plurality of types of vibrations having different frequency bands can be reliably attenuated and absorbed.

  In addition, a plurality of the restriction passages are provided with different resonance frequencies, and the switching means includes a restriction passage through which liquid flows in accordance with the fluid pressure in the connection passage introduced from the fluid pressure introduction passage. You may switch.

  In this case, since the switching means switches the restriction passage through which the liquid flows according to the fluid pressure in the connection passage introduced from the fluid pressure introduction passage, the passage length of the restriction passage, the passage sectional area, and the like are changed. The resonance frequency of the restriction passage that causes liquid column resonance with respect to vibration input and attenuates and absorbs vibration can be switched.

  Further, the switching means may switch communication and blocking between the main liquid chamber and the sub liquid chamber through the first restriction passage having the smallest flow resistance among the plurality of restriction passages.

In this case, when the communication between the main liquid chamber and the sub liquid chamber through the first restriction passage is blocked, the liquid flows through the other restriction passage.
Here, since the first restriction passage has the smallest flow resistance among the plurality of restriction passages, when the blocking of the communication between the main liquid chamber and the sub liquid chamber through the first restriction passage is released, the liquid is Then, it actively circulates between the main liquid chamber and the sub liquid chamber through the first restriction passage.
As described above, the switching means switches the restriction passage through which the liquid flows from the other restriction passage to the first restriction passage only by releasing the blocking of the communication between the main liquid chamber and the sub liquid chamber by the first restriction passage. be able to.

The plurality of restriction passages have a resonance frequency that is lower than that of the first restriction passage and a first vibration that causes a liquid column resonance in the first restriction passage when input. The thin film body may be configured to be elastically deformed to cause liquid column resonance in the connection path when the first vibration is input.
Furthermore, the first vibration may be an idle vibration, and the second vibration may be a shake vibration.

In this case, when the shake vibration (second vibration) is input from the no-input state where no vibration is input to the vibration isolator, the thin film body is elastically deformed, but the hydraulic pressure fluctuation in the connection path is small. The disconnection of the communication between the main liquid chamber and the sub liquid chamber through the first restriction passage is maintained. Accordingly, the liquid flows between the main liquid chamber and the sub liquid chamber through the second restriction passage, and liquid column resonance occurs in the second restriction passage, so that the shake vibration is attenuated and absorbed.
Further, when idle vibration (first vibration) is input to the vibration isolator, the thin film body is elastically deformed to cause liquid column resonance in the connection path, and the liquid pressure in the connection path varies greatly. When the hydraulic pressure at this time is introduced from the hydraulic pressure introduction path, the switching unit cancels the disconnection of the communication between the main liquid chamber and the sub liquid chamber through the first restriction passage. Thereby, the restriction passage through which the liquid flows is switched from the second restriction passage to the first restriction passage having a small flow resistance, and the liquid flows between the main liquid chamber and the sub liquid chamber through the first restriction passage, Liquid column resonance occurs in the first restriction passage, and idle vibration is attenuated and absorbed.
After that, when no vibration is input to the vibration isolator and a vibration is input instead, a fluctuation in the hydraulic pressure in the connection path is reduced, and the switching means is connected to the main liquid chamber through the first restriction passage. Block communication with the secondary liquid chamber. As a result, the restriction passage through which the liquid flows is switched from the first restriction passage to the second restriction passage, and the liquid flows between the main liquid chamber and the sub liquid chamber through the second restriction passage. Liquid column resonance occurs in the passage, and the shake vibration is attenuated and absorbed.

  Further, the partition member is formed with a cylinder chamber that communicates with the sub liquid chamber, and a passage opening that constitutes a part of the first restriction passage and communicates the cylinder chamber and the main liquid chamber, The switching means includes a piston member disposed in the cylinder chamber, and the piston member forms a part of the first restriction passage and communicates with the auxiliary liquid chamber in the cylinder chamber; A pressurizing space that is isolated from the first restricting passage and communicates with the connection passage through the hydraulic pressure introduction passage; a partitioning portion; and expansion and contraction of the passage space and the pressurizing space rather than the partitioning portion A sliding cylinder portion that is disposed on the side of the passage space along the direction and that has a through opening formed therein, and that forms a part of the first restriction passage, and that extends in the expansion / contraction direction in the cylinder chamber. Slidable along , In the sliding tube portion, a portion located in the passage space side along the scaling direction than the through opening may be closed to the passage opening.

  In this case, when the hydraulic pressure in the connection path is increased, the increased hydraulic pressure is transmitted to the pressurizing space through the hydraulic pressure introducing path, and the expansion / contraction is performed so that the piston member expands the internal volume of the pressurizing space. It slides toward the passage space side along the direction. Then, the passage opening portion closed by the sliding cylinder portion is opened through the through opening, and this passage opening portion and the passage space communicate with each other through the inside of the through opening and the sliding cylinder portion. The disconnection of the communication between the main liquid chamber and the sub liquid chamber is released.

  Further, the piston member has a passage space side along the expansion / contraction direction until a portion of the piston member located on the pressure space side along the expansion / contraction direction with respect to the through-opening closes the passage opening. It may be slidably disposed in the cylinder chamber.

In this case, idle vibration is input to the vibration isolator, and after the through opening of the sliding cylinder portion and the passage opening of the partition member communicate with each other, the frequency of the input vibration is further increased, and the first restriction passage and the connection are connected. Even if anti-resonance occurs in the road, it is possible to prevent the dynamic spring constant of the vibration isolator from increasing and the vibration absorption performance from deteriorating.
That is, when anti-resonance occurs in the connection path, the hydraulic pressure in the connection path is increased, and the piston member slides in the cylinder chamber and closes the passage opening of the partition member. As a result, the communication between the main liquid chamber and the sub liquid chamber through the first restricting passage is blocked, and the liquid flows through the second restricting passage, thereby suppressing an increase in the dynamic spring constant of the vibration isolator. it can.

  According to the vibration isolator of the present invention, the resonance frequency of the restriction passage is switched according to the frequency of the input vibration, and a plurality of types of vibrations having different frequency bands can be reliably attenuated and absorbed.

It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on one Embodiment of this invention. It is a disassembled perspective view of the partition member which comprises the vibration isolator shown in FIG. It is a perspective view of the partition member main body which comprises the partition member shown in FIG. It is a longitudinal cross-sectional view of the partition member shown in FIG. It is a schematic diagram which shows typically the vibration isolator shown in FIG. It is a longitudinal cross-sectional view of the partition member shown in FIG. It is a schematic diagram which shows typically the vibration isolator shown in FIG. It is a longitudinal cross-sectional view of the partition member shown in FIG. It is a schematic diagram which shows typically the vibration isolator shown in FIG.

Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical first mounting member 2 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member 3 connected to the other. The elastic body 4 elastically connecting the first mounting member 2 and the second mounting member 3, the liquid chamber 5 in the first mounting member 2 in which the liquid L is sealed, and the elastic body 4 as a part of the wall surface. A partition member 8 that is divided into a main liquid chamber 6 on one side and a sub liquid chamber 7 on the other side.
When the vibration isolator 1 is mounted on an automobile, for example, the second mounting member 3 is connected to an engine as a vibration generating unit, while the first mounting member 2 is connected to a vehicle body as a vibration receiving unit. The engine vibration can be suppressed from being transmitted to the vehicle body.

  The first mounting member 2 is formed in a cylindrical shape, and the second mounting member 3, the elastic body 4, and the partition member 8 are each formed in a circular shape in plan view. The attachment member 3, the elastic body 4, and the partition member 8 are all disposed in a state where the central axis is located on the common axis. Hereinafter, this common axis is referred to as a central axis O, the main liquid chamber 6 side with respect to the partition member 8 along the central axis O direction is referred to as one side, and the sub liquid chamber 7 side is referred to as the other side. A direction perpendicular to the radial direction is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.

The first mounting member 2 has a configuration in which one side cylinder portion 10 located on one side and the other side cylinder portion 11 located on the other side are fixed to each other with bolts 12.
The other side cylinder part 11 includes a peripheral wall part 14 whose inner peripheral surface is entirely covered with a coating film 13, and an inner ring part 15 projecting radially outward from one end of the peripheral wall part 14. And an outer ring portion 16 in which the outer peripheral surface of the inner ring portion 15 is connected to the inner peripheral surface of the other end portion.

  The other end opening (the opening on the other side of the first mounting member) of the peripheral wall portion 14 of the other side cylinder portion 11 is closed by a diaphragm 17 constituting a part of the wall surface of the sub liquid chamber 7. The diaphragm 17 is formed in a circular shape in plan view and is disposed coaxially with the central axis O. The outer peripheral edge portion of the diaphragm 17 is vulcanized and bonded to the inner peripheral surface of the other end portion of the peripheral wall portion 14 over the entire periphery. In the illustrated example, the diaphragm 17 and the covering film 13 are integrally formed of an elastic material such as a rubber material or a synthetic resin material.

The one-side cylindrical portion 10 includes a peripheral wall portion 18 to which the outer ring portion 16 of the other-side cylindrical portion 11 is fixed, and a flange portion 19 that protrudes radially outward from one end portion of the peripheral wall portion 18. I have.
The peripheral wall portion 18 has an inner diameter that is equivalent to the inner diameter of the peripheral wall portion 14 of the other side cylinder portion 11, and an outer diameter that is equivalent to the outer diameter of the outer ring portion 16 of the other side cylinder portion 11. .

The second mounting member 3 includes an inverted frustoconical anchor portion 20 that gradually decreases in diameter from one side to the other side, and a connecting plate portion 21 that projects from the anchor portion 20 toward the one side. ing.
The elastic body 4 closes the opening on one end side of the first mounting member 2 and is formed of an elastic body material such as a rubber material or a synthetic resin material, for example. The other end portion of the elastic body 4 is vulcanized and bonded to the inner peripheral surface of the peripheral wall portion 18 of the one-side cylindrical portion 10 of the first attachment member 2, and one end portion of the elastic body 4 is attached to the second attachment member 3. The anchor portion 20 is vulcanized and bonded to the outer peripheral surface. In the illustrated example, the other end surface of the elastic body 4 is gradually depressed toward one side from the radially outer side toward the central portion.

The liquid chamber 5 is a portion located between the diaphragm 17 and the elastic body 4 in the inside of the first mounting member 2. In the liquid chamber 5, for example, a liquid L such as ethylene glycol, water, silicone oil, or the like. And a partition member 8 is disposed.
The partition member 8 is sandwiched between the columnar partition member main body 30, the disk-shaped presser plate 31 assembled to the partition member main body 30 from one side, and the partition member main body 30 and the presser plate 31 to be elastic. And a membrane plate 32 formed of a body material (for example, a rubber material).

  In the illustrated example, all of the partition member main body 30, the pressing plate 31, and the membrane plate 32 are arranged coaxially with the central axis O. Further, the partition member 8 is formed with a screw hole that opens toward one side, and the holding plate 31 and the membrane plate 32 are formed with insertion holes penetrating in the direction of the central axis O, respectively. The holding plate 31 and the membrane plate 32 are assembled to the partition member main body 30 by a fixing bolt 35 that is inserted into the insertion hole from one side and screwed into the screw hole.

  As shown in FIG. 2, an annular groove 67 is formed on one end surface of the partition member main body 30 so that a fitting tube portion 66 extending toward the other side is fitted to the outer peripheral edge of the membrane plate 32. ing. Further, as shown in FIG. 1, a flange portion 36 having an outer diameter equal to the outer diameter of the pressing plate 31 protrudes from the outer peripheral surface of one end portion of the partition member main body 30. The outer peripheral edge portion of the pressing plate 31 and the flange portion 36 are sandwiched between the peripheral wall portion 18 of the one-side tube portion 10 and the inner ring portion 15 of the other-side tube portion 11 in the first mounting member 2. In addition, the partition member main body 30 and the flange part 36 are integrally formed, for example with metal materials (for example, aluminum etc.), a synthetic resin material, etc.

  Here, as shown in FIG. 2, the partition member 8 communicates with the main liquid chamber 6 and the sub liquid chamber 7 to generate liquid column resonance with respect to the vibration input, and to limit passages 70 and 71 for damping and absorbing the vibration. The switching means 72 for switching the resonance frequencies of the restriction passages 70 and 71, the connection path 74 that connects the main liquid chamber 6 and the sub liquid chamber 7, and the end of the connection path 74 on the main liquid chamber 6 side are configured. A fluid pressure introduction path 47 that communicates with the thin film body chamber 41 and introduces the hydraulic pressure in the connection path 74 to the switching means 72 to operate the switching means 72, and the fluid pressure introduction path 47 in the thin film body chamber 41. A thin film body 73 disposed on the main liquid chamber 6 side and blocking communication between the main liquid chamber 6 and the sub liquid chamber 7 through the connection path 74 is provided.

  In the present embodiment, a plurality of limiting passages 70 and 71 are provided with different resonance frequencies, and the limiting passages 70 and 71 have a resonance frequency of idle vibration (first vibration) (for example, a frequency of 18 Hz to 30 Hz). , An idle orifice (first restriction passage) 70 having an amplitude of ± 0.5 mm or less, and a shake vibration (second vibration) whose resonance frequency is lower than that of idle vibration (for example, the frequency is 14 Hz or less) And a shake orifice (second restriction passage) 71 having a frequency of amplitude larger than ± 0.5 mm. In the illustrated example, a part of the idle orifice 70 also serves as a part of the shake orifice 71.

  Here, the partition member main body 30 is formed with grooves 37, 38, 39, chambers 40, 41, 42, and holes 43 that constitute part of the restriction passages 70, 71 and the connection path 74, respectively. That is, the first circumferential groove 37, the second circumferential groove 38, and the third circumferential groove 39 that are closed from the outside in the radial direction by the coating film 13 are formed on the outer circumferential surface of the partition member body 30 in the direction of the central axis O. They are formed in this order from one side to the other side at intervals. Further, in the partition member body 30, a portion located on the inner side in the radial direction than these three circumferential grooves 37, 38, 39 and on the inner side in the radial direction than the fitting groove 67 formed on one end surface is provided. The cylinder chamber 40 extending in the direction of the central axis O and opening toward one side, the thin film body chamber 41, the orifice chamber 42, and the through hole 43 extending in the direction of the central axis O in this order are circumferential directions. And are adjacent to each other in the circumferential direction.

As shown in FIG. 1, the orifice chamber 42 includes a first orifice opening 61 formed in a position corresponding to the orifice chamber 42 in the direction of the central axis O, and a second in each of the holding plate 31 and the membrane plate 32. It communicates with the main liquid chamber 6 through the orifice opening 64.
The orifice chamber 42 is formed with a depth equivalent to that of the third circumferential groove 39 in the direction of the central axis O. The orifice chamber 42 is formed on a side wall surface defining the orifice chamber 42 and opens outward in the radial direction. The second circumferential groove 38 and the third circumferential groove 39 communicate with each other through the first communication opening 53.

  As shown in FIGS. 2 and 3, the second circumferential groove 38 is formed on the outer circumferential surface of the partition member 8 over the entire circumference. As shown in FIG. 2, the second circumferential groove 38 is formed in a portion of the bottom wall surface defining the second circumferential groove 38 that is located on the radially outer side of the cylinder chamber 40, and faces the radially inner side. It communicates with the cylinder chamber 40 through the second communication opening 50 that opens.

  The cylinder chamber 40 is formed in a circular shape in plan view, and a cylinder opening 63 is formed in the membrane plate 32 at a position corresponding to the cylinder chamber 40 in the direction of the central axis O. As shown in FIG. 4, the other end surface of the circumferential portion where the cylinder chamber 40 is formed in the partition member main body 30 is provided with an overhanging portion 44 projecting toward the other side. Further, it is formed deeply into the overhanging portion 44.

  A shaft portion 45 extending toward one side is provided at the center of the bottom wall surface that defines the cylinder chamber 40. The bottom wall surface is formed with a plurality of communication holes 46 which are arranged at intervals so as to surround the periphery of the shaft portion 45 in plan view and open toward the other side. It communicates with the auxiliary liquid chamber 7 through the communication hole 46.

  As shown in FIG. 3, the third circumferential groove 39 extends from a portion located on the outer side in the radial direction of the orifice chamber 42 to a portion located on the outer side in the radial direction of the through hole 43 on the outer peripheral surface of the partition member body 30. The outer peripheral surface extends so as to go about one round. The third circumferential groove 39 is formed on the side wall surface located on the other side of the wall surfaces defining one circumferential end portion located on the radially outer side of the through hole 43 in the third circumferential groove 39. It communicates with the auxiliary liquid chamber 7 through a first communication cutout 51 that opens toward the side. In the illustrated example, the first communication cutout 51 is formed from the side wall surface located on the other side to the bottom wall surface at the one peripheral end, and the third circumferential groove 39 passes through the first communication cutout 51. It communicates with the through hole 43.

  Here, as shown in FIGS. 2 to 4, in the partition member 8, the idle orifice 70 has a first orifice opening 61 and a second orifice opening from the main liquid chamber 6 side to the sub liquid chamber 7 side. 64, the orifice chamber 42, the first communication opening 53, the second circumferential groove 38, the second communication opening 50, a passage space 95 to be described later in the cylinder chamber 40, and the communication hole 46. The channel length and the channel cross-sectional area of the idle orifice 70 are set (tuned) in advance so that the resonance frequency of the idle orifice 70 becomes the frequency of idle vibration. In the illustrated example, the flow passage cross-sectional area of the second circumferential groove 38 is the smallest among the components (liquid chamber, opening, circumferential groove) constituting the idle orifice 70.

  Further, as shown in FIGS. 2 and 3, the shake orifice 71 has a first orifice opening 61, a second orifice opening 64, an orifice chamber 42, a first orifice, from the main liquid chamber 6 side to the sub liquid chamber 7 side. The first communication opening 53, the third circumferential groove 39, and the first communication cutout 51 are configured in this order. The channel length and the channel cross-sectional area of the shake orifice 71 are preset (tuned) so that the resonance frequency of the shake orifice 71 becomes the frequency of the shake vibration. In the illustrated example, among the constituent elements (liquid chamber, opening, circumferential groove, notch) constituting the shake orifice 71, the flow passage cross-sectional area of the third circumferential groove 39 is the smallest.

  As shown in FIG. 3, the second circumferential groove 38 and the third circumferential groove 39 communicate with each other through a second communication notch 52 formed in a groove partition wall portion 52 a that partitions both circumferential grooves 38, 39. The 2nd communication notch 52 is formed in the part located in the radial direction outer side of the orifice chamber 42 among the groove partition walls 52a.

  As shown in FIG. 2, the thin film body chamber 41 communicates with the main liquid chamber 6 through a film opening 60 formed at a position corresponding to the thin film body chamber 41 in the direction of the central axis O in the pressing plate 31. Yes. As shown in FIG. 4, the thin film body chamber 41 is formed at the same depth as the first circumferential groove 37 in the direction of the central axis O, and is formed on the side wall surface defining the thin film body chamber 41. The first circumferential groove 37 communicates through a third communication opening 48 that opens outward in the radial direction.

As shown in FIG. 3, the first circumferential groove 37 is formed on the outer circumferential surface of the partition member main body 30 from a portion located on the radially outer side of the thin film body chamber 41 to a portion located on the radially outer side of the through hole 43. It extends to. In the illustrated example, the first circumferential groove 37 extends along the dominant arc of the arcs connecting the thin film body chamber 41 and the through hole 43 along the outer peripheral surface of the partition member main body 30, and the partition member main body 30. A portion of the outer peripheral surface located outside the orifice chamber 42 in the radial direction is avoided.
Further, the first circumferential groove 37 is formed in a bottom wall surface defining a circumferential end portion located on the radially outer side of the through hole 43 in the first circumferential groove 37 and is open to the radially inner side. The opening 49 communicates with the through hole 43.

  Here, as shown in FIGS. 2 and 3, the connection path 74 has a film opening 60, a thin film body chamber 41, a third communication opening 48, a first connection from the main liquid chamber 6 side to the sub liquid chamber 7 side. The first circumferential groove 37, the fourth communication opening 49, and the through hole 43 are configured in this order. In the illustrated example, among the components (liquid chamber, opening, circumferential groove, hole) constituting the connection path 74, the flow passage cross-sectional area of the first circumferential groove 37 is the smallest.

  As shown in FIG. 2, in the membrane plate 32, high-frequency vibration (for example, the frequency is 100 Hz or more) higher in frequency than idle vibration is attenuated and absorbed at a position corresponding to the through hole 43 in the direction of the central axis O. A high-frequency membrane 65 configured as described above is formed. The high-frequency membrane 65 is a buffer film that faces the main liquid chamber 6 through a high-frequency opening 62 formed in the holding plate 31.

The fluid pressure introduction path 47 opens toward the cylinder chamber 40 on the side wall surface defining the thin film body chamber 41, and communicates the thin film body chamber 41 and the cylinder chamber 40. In the illustrated example, the fluid pressure introduction path 47 is directed toward one side. It is a notch that opens.
The thin film body 73 is formed in the membrane plate 32 at a position corresponding to the thin film body chamber 41 in the direction of the central axis O. For example, the thin film body 73 has a channel length, a channel cross-sectional area, an elastic modulus of the thin film body 73, and the like set (tuned) in advance in the connection path 74 when an idle vibration is input. It is configured to elastically deform so as to cause liquid column resonance.

As shown in FIG. 4, the switching means 72 switches the restriction passages 70 and 71 through which the liquid L flows in accordance with the fluid pressure in the connection passage 74 introduced from the fluid pressure introduction passage 47. The switching means 72 switches communication and blocking between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 having the smallest flow resistance among the plurality of restriction passages 70, 71.
In the present embodiment, the switching means 72 blocks the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70, and when the hydraulic pressure in the connection path 74 is increased, the idle orifice The disconnection of the communication between the main liquid chamber 6 and the auxiliary liquid chamber 7 through 70 is released. Further, the switching means 72 blocks the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 when the liquid pressure increased in the connection path 74 decreases.

The switching means 72 is disposed in the cylinder chamber 40. The switching means 72 includes a bottomed cylindrical fixing member 80 fitted in one end of the cylinder chamber 40, and a valve member 81 that regulates the inflow of the liquid L from the other side to the one side with respect to the fixing member 80. A piston member 82 slidably disposed in the cylinder chamber 40 in the direction of the central axis O (direction of expansion and contraction between the passage space and the pressurizing space), and the piston member 82 and the cylinder chamber 40 are defined. And a coil spring 83 interposed between the bottom wall surface.
The valve member 81 and the piston member 82 are formed in a circular shape in plan view, and the fixing member 80, the valve member 81, the piston member 82, and the coil spring 83 are disposed coaxially with the shaft portion 45. Yes.

A communication window 85 communicating with the hydraulic pressure introduction passage 47 is formed in the peripheral wall portion 84 of the fixing member 80. Further, in the illustrated example, a portion of the peripheral wall portion 84 of the fixing member 80 located on the other side of the connecting window 85 is formed of an elastic material such as a rubber material, and the outer peripheral surface of the peripheral wall portion 84 and the cylinder chamber. An outer fitting ring 87 that seals liquid-tightly between the side wall surfaces defining 40 is fitted.
The bottom wall portion 88 of the fixing member 80 is formed with a fitting hole 89 arranged at the center thereof and a plurality of valve seat openings 90 arranged so as to surround the fitting hole 89 from the periphery. .

The valve member 81 is provided in a disc-like shape with a disc-shaped valve body 91 that presses against the bottom wall portion 88 of the fixing member 80 from the other side and closes the valve seat opening 90, and protrudes toward the one side at the center of the valve body 91. And one side projection 92 fitted into the fitting hole 89, and the other side projection which protrudes toward the other side at the center portion of the valve body 91 and whose end surface is in contact with the end surface of the shaft portion 45. 93. The valve body 91, the one-side protrusion 92, and the other-side protrusion 93 are integrally formed of an elastic material such as a rubber material or a synthetic resin material.
The outer diameter of the other side projection 93 is equal to the outer diameter of the shaft portion 45, and the other side projection 93 and the shaft portion 45 extend in the direction of the central axis O and are arranged coaxially with the shaft portion 45. It is fitted in the fitting cylinder 94.

  The piston member 82 is connected to the passage space 95 on the other side (passage space side along the expansion / contraction direction) that communicates with the sub liquid chamber 7 through the communication hole 46 in the cylinder chamber 40 and forms a part of the idle orifice 70. A partition ring part (partition part) 97 partitioned into a pressure space 96 on one side (pressure space side along the expansion / contraction direction) communicating with the path 74 through the fluid pressure introduction path 47, and the partition ring part 97 A sliding cylinder 98 extending toward the other side at the outer peripheral edge and the inside forming a part of the idle orifice 70, and a guide cylinder extending from the inner peripheral edge of the partition ring 97 toward the other side 99.

A fitting tube 94 is fitted in the partition ring portion 97 and the guide tube portion 99, and the inner peripheral surfaces of the partition ring portion 97 and the guide tube portion 99 slide on the outer peripheral surface of the fit tube 94. It touches.
A plurality of through-openings 100 are formed in one side portion of the sliding cylinder portion 98 located on one side at intervals in the circumferential direction of the sliding cylinder portion 98. The size of the through opening 100 along the direction of the central axis O constitutes a part of the idle orifice 70 and the second communication opening (passage opening) 50 that communicates the cylinder chamber 40 and the main liquid chamber 6. Is larger than the size along the direction of the central axis O.
In the sliding cylinder portion 98, the other side portion located on the other side of the one side portion closes the second communication opening 50 from the inside of the cylinder chamber 40.

A guide tube portion 99 is inserted into the coil spring 83. The coil spring 83 urges the piston member 82 to one side so that the partition ring portion 97 abuts on the valve body 91, and the urging force is applied to the liquid in the pressurizing space 96 when the idle vibration is input. It is smaller than the force that balances the pressure.
In the illustrated example, a stopper ring 101 that contacts the other end edge of the sliding cylinder portion 98 at the other end position of the piston member 82 is fitted in the other end portion of the cylinder chamber 40. The stopper ring 101 is made of an elastic material such as a rubber material or a synthetic resin material.

  Next, the operation of the vibration isolator 1 configured as described above will be described. 5, FIG. 7, and FIG. 9 shown below schematically show the relationship among the main liquid chamber 6, the sub liquid chamber 7, the idle orifice 70, the shake orifice 71, the connection path 74, and the switching means 72 of the vibration isolator 1. It is the figure shown in.

First, as shown in FIGS. 4 and 5, a case will be described in which shake vibration is input to the vibration isolator 1 from a non-input state in which no vibration is input.
In this embodiment, since the thin film body 73 is elastically deformed so as to cause liquid column resonance in the connection path 74 when an idle vibration is input, in this case, the thin film body 73 is connected to the elastic deformation. Since liquid column resonance does not occur in the channel 74 and the fluid pressure fluctuation in the connection channel 74 is small, the disconnection of the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is maintained. Accordingly, the liquid L flows between the main liquid chamber 6 and the sub liquid chamber 7 through the shake orifice 71, and liquid column resonance occurs in the shake orifice 71 so that the shake vibration is attenuated and absorbed.

Next, a case where idle vibration is input to the vibration isolator 1 will be described.
In this case, since the thin film body 73 is elastically deformed and liquid column resonance occurs in the connection path 74, the liquid pressure in the connection path 74 is greatly changed and increased. The fluid pressure at this time is introduced into the pressurizing space 96 from the fluid pressure introduction path 47, so that the switching means 72 cancels the disconnection of the communication between the main fluid chamber 6 and the sub fluid chamber 7 through the idle orifice 70. To do.

  That is, the hydraulic pressure in the connection path 74 is transmitted to the fixing member 80 through the hydraulic pressure introducing path 47 and the communication window 85, and further to the valve body 91 of the valve member 81 through the valve seat opening 90. At this time, the valve body 91 is elastically deformed so as to be separated from the bottom wall portion 88 of the fixing member 80, whereby the valve seat opening 90 is opened, and the inside of the fixing member 80 and the inside of the pressurizing space 96 communicate with each other. . As a result, the hydraulic pressure is exerted on the piston member 82, and the piston member 82 faces the other side of the cylinder chamber 40 against the urging force of the coil spring 83 so as to expand the internal volume of the pressurizing space 96. Slide. Then, as shown in FIGS. 6 and 7, the second communication opening 50 closed by the other side portion of the sliding cylinder portion 98 is opened through the through opening 100, and the second communication opening 50 and the passage space 95 are opened. Are communicated with each other through the through opening 100 and the sliding cylinder portion 98, and the disconnection of the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is released.

Here, since the idle orifice 70 has the smallest flow resistance among the plurality of restriction passages 70 and 71, when the disconnection of the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is released. The liquid L actively circulates between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70.
Therefore, the restriction passages 70 and 71 through which the liquid L flows are switched from the shake orifice 71 to the idle orifice 70. As a result, the liquid L flows between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70, and a liquid column resonance occurs in the idle orifice 70 so that the idle vibration is attenuated and absorbed.

After that, when no vibration is input to the vibration isolator 1 and shake vibration is input instead, the fluctuation in the hydraulic pressure in the connection path 74 is reduced and the hydraulic pressure in the connection path 74 is increased. Therefore, the switching means 72 blocks the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70.
That is, the piston member 82 is slid toward the one side in the cylinder chamber 40 by the biasing force of the coil spring 83, and the second communication opening 50 is closed by the other side portion of the sliding cylinder portion 98. Is done. At this time, since the hydraulic pressure in the fixing member 80 becomes smaller than the hydraulic pressure in the pressurizing space 96, the valve main body 91 of the valve member 81 comes into pressure contact with the bottom wall portion 88 of the fixing member 80 from the other side. The valve seat opening 90 is closed. Further, the liquid L in the pressurizing space 96 flows into the sub liquid chamber 7 through a gap (not shown) between the piston member 82 and the side wall surface defining the cylinder chamber 40 and the communication hole 46, for example.

  Thereby, the restriction passages 70 and 71 through which the liquid L flows are switched from the idle orifice 70 to the shake orifice 71, and the liquid L flows between the main liquid chamber 6 and the sub liquid chamber 7 through the shake orifice 71, Liquid column resonance occurs in the shake orifice 71, and the shake vibration is attenuated and absorbed.

  In this embodiment, as shown in FIGS. 8 and 9, after the penetrating opening 100 of the sliding cylinder portion 98 communicates with the second communication opening 50 of the partition member main body 30, the piston member 82 is moved to the other side. When the other end edge of the sliding cylinder portion 98 abuts against the stopper ring 101 while continuing to slide toward the stopper ring 101, the pressure of the piston member 82 is increased in the expansion / contraction direction than the through-opening in the piston member The portion located on the space side) closes the second communication opening 50. Therefore, also in this case, the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is blocked, and the restriction passages 70 and 71 through which the liquid L flows are connected from the idle orifice 70 to the shake orifice 71. It will be switched to.

  As described above, according to the vibration isolator 1 according to the present embodiment, the thin film body 73 blocks communication between the main liquid chamber 6 and the sub liquid chamber 7 through the connection path 74. When the thin film body 73 is elastically deformed by vibration input to the vibration isolator 1 and liquid column resonance occurs in the connection path 74, the liquid pressure in the connection path 74 greatly fluctuates. That is, the hydraulic pressure in the connection path 74 varies according to the frequency of vibration input to the vibration isolator 1, and this hydraulic pressure is introduced into the switching means 72 through the hydraulic pressure introduction path 47 and the switching means 72 is activated. Thus, the resonance frequencies of the restriction passages 70 and 71 that cause liquid column resonance with respect to the vibration input and attenuate and absorb the vibration are switched.

Therefore, since the resonance frequencies of the restriction passages 70 and 71 are switched according to the vibration frequency input to the vibration isolator 1, a plurality of types of vibrations having different frequency bands can be reliably attenuated and absorbed.
Further, since the switching means 72 switches the restriction passages 70 and 71 through which the liquid L flows according to the fluid pressure in the connection passage 74 introduced from the fluid pressure introduction passage 47, the flow path length of the restriction passages 70 and 71. Without changing the channel cross-sectional area, the resonance frequency of the limiting passages 70 and 71 that cause liquid column resonance with respect to vibration input and attenuate and absorb vibration can be switched.

In addition, after idling vibration is input to the vibration isolator 1 and the through opening 100 of the sliding cylinder portion 98 and the second communication opening 50 of the partition member body 30 communicate with each other, the frequency of the input vibration further increases, Even if anti-resonance occurs in the orifice 70 and the connection path 74, it is possible to suppress the increase in the dynamic spring constant of the vibration isolator 1 and the deterioration of the vibration damping absorption performance.
That is, when anti-resonance occurs in the connection path 74, the hydraulic pressure in the connection path 74 is increased, and the piston member 82 slides in the cylinder chamber 40 and closes the second communication opening 50 of the partition member body 30. To do. As a result, the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is cut off, and the liquid L flows through the shake orifice 71, thereby suppressing an increase in the dynamic spring constant of the vibration isolator 1. be able to.

Further, in the present embodiment, the thin film body 73 extends in the partition member body 30 in the direction of the central axis O, and is disposed in the thin film body chamber 41 in which the flow passage cross-sectional area can be easily adjusted while suppressing the enlargement of the partition member 8. Therefore, the above-described tuning of the thin film body 73 can be easily performed.
Moreover, since the partition member 8 includes the high-frequency membrane 65 facing the main liquid chamber 6, it is possible to increase the flexibility of the entire vibration isolator 1 and improve the attenuation absorption performance.
Furthermore, since the high frequency membrane 65 attenuates and absorbs the high frequency vibration, it effectively suppresses the high frequency vibration that occurs when the vehicle speed is 100 Km / h or higher, or when the engine speed is 3000 rpm or higher, for example, Thus, it is possible to suppress the generation of a humming sound or the like caused by this high frequency vibration.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the high-frequency membrane 65 attenuates and absorbs the high-frequency vibration, but is not limited thereto. Further, the high-frequency membrane 65 may not be provided.

  Moreover, in the said embodiment, although the thin film body chamber 41 shall have comprised the edge part by the side of the main liquid chamber 6 of the connection path 74, it is not restricted to this, For example, the subliquid of the connection path 74 An end portion on the chamber 7 side may be configured, and a portion located between both ends on the main liquid chamber 6 side and the sub liquid chamber 7 side in the connection path 74 may be configured.

  Furthermore, in the said embodiment, although the thin film body 73 shall be arrange | positioned in the thin film body chamber 41, if it is arrange | positioned in the connection path 74, it will not be restricted to this. In this case, for example, the connection path 74 is constituted by a circumferential groove formed on the outer circumferential surface of the partition member 8 and an opening that communicates the circumferential groove with the main liquid chamber 6 and the sub liquid chamber 7, and a thin film It is good also as a structure which is not provided with the chamber extended along the said central axis O direction like the body chamber 41. FIG.

Furthermore, in the embodiment, the thin film body 73 is provided in the thin film body chamber 41 on the main liquid chamber 6 side than the hydraulic pressure introduction path 47, and in the connection path 74, the main liquid chamber is located on the main liquid chamber 6 side. Although it has been arranged on the chamber 6 side, it is not limited to this. The thin film body 73 only needs to be arranged so that the hydraulic pressure fluctuation (hydraulic pressure amplitude) due to the liquid column resonance (resonance) generated in the connection path 74 is introduced into the switching means 72 through the hydraulic pressure introduction path 47. That is, the liquid pressure in the main liquid chamber 6 or the liquid pressure in the sub liquid chamber 7 is disposed in the connection path 74 so as to restrict the liquid pressure from being directly introduced into the switching means 72 through the liquid pressure introduction path 47. It means that it should be.
For example, when the hydraulic pressure introduction path 47 is disposed so as to communicate with a portion of the connection path 74 located on the sub liquid chamber 7 side, the thin film body 73 is disposed closer to the sub liquid chamber 7 than the hydraulic pressure introduction path 47. If arranged, the hydraulic pressure in the auxiliary liquid chamber 7 is not directly introduced into the switching means 72, but hydraulic pressure fluctuations (hydraulic pressure amplitude) generated by the resonance system of the connection path 74 and the thin film body 73 are introduced. Therefore, the effect of the present invention is exhibited.

In the above embodiment, the piston member 82 is disposed in the cylinder chamber 40 so as to be slidable on the other side until the partition ring portion 97 closes the second communication opening 50. It is not limited.
Furthermore, in the said embodiment, although the switching means 72 shall be provided with the piston member 82, it is not restricted to this.

In the embodiment, the thin film body 73 is elastic so as to cause liquid column resonance in the connection path 74 at the time of input of idle vibration that causes liquid column resonance in the idle orifice 70 when input to the vibration isolator 1. Although it shall be the structure which deform | transforms, it is not restricted to this.
For example, the thin film body 73 is configured to be elastically deformed so as to cause liquid column resonance in the connection path 74 when a shake vibration is input, and the main liquid chamber is passed through the idle orifice 70 and the shake orifice 71 in a no-input state. 6 and the secondary liquid chamber 7 may be communicated, and the switching means 72 may be configured to switch communication between the main liquid chamber 6 and the secondary liquid chamber 7 through the idle orifice 70 and blocking.

In the above-described embodiment, the switching unit 72 switches between communication and blocking between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70. However, the present invention is not limited to this.
Further, in the above-described embodiment, a plurality of restriction passages 70 and 71 are provided with resonance frequencies different from each other. However, the present invention is not limited to this.
For example, the partition member has one restriction passage, and the switching means changes the flow path length and the cross-sectional area of the restriction passage, thereby causing liquid column resonance with respect to vibration input and damping the vibration. It may be configured to switch the resonance frequency of the limiting passage to be absorbed.

  In the above-described embodiment, the compression-type vibration isolator 1 in which a positive pressure is applied to the main liquid chamber 6 when a support load is applied has been described. However, the main liquid chamber is located on the lower side in the vertical direction and the auxiliary liquid chamber. Can be applied to a suspension type vibration isolator in which a negative pressure is applied to the main liquid chamber by applying a support load.

  Moreover, in the said embodiment, although the 1st attachment member 2 is connected with the vibration receiving part and the 2nd attachment member 3 is connected with the vibration generation part, this invention connects the 1st attachment member 2 with the vibration generation part. The second mounting member 3 may be coupled to the vibration receiving portion.

  Further, the vibration isolator 1 according to the present invention is not limited to the engine mount of the vehicle, but can be applied to the vibration isolator 1 other than the engine mount. For example, the present invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.

  In the embodiment, the plurality of restriction passages 70 and 71 include the idle orifice 70 whose resonance frequency is the frequency of idle vibration and the shake orifice 71 whose resonance frequency is the frequency of shake vibration. However, the present invention is not limited to this, and the resonance frequency of the restriction passage may be a vibration frequency different from the idle vibration and the shake vibration.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

L Liquid 1 Vibration isolator 2 First mounting member 3 Second mounting member 4 Elastic body 5 Liquid chamber 6 Main liquid chamber 7 Sub liquid chamber 8 Partition member 40 Cylinder chamber 47 Hydraulic pressure introduction path 50 Second communication opening (path opening) )
70 Idle orifice (first restricted passage)
71 Shake orifice (second restricted passage)
72 Switching means 73 Thin film body 74 Connection path 82 Piston member 95 Passage space 96 Pressurization space 97 Compartment ring part (compartment part)
98 Sliding cylinder part 100 Through opening

Claims (7)

A cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body elastically connecting the first mounting member and the second mounting member;
A partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a main liquid chamber on one side and a sub liquid chamber on the other side, the elastic body being a part of a wall surface; A liquid-sealed vibration isolator,
The partition member is
A limiting passage that connects the main liquid chamber and the sub liquid chamber to cause liquid column resonance with respect to vibration input and attenuates and absorbs vibration;
Switching means for switching the resonance frequency of the restriction passage;
A connection path connecting the main liquid chamber and the sub liquid chamber;
A hydraulic pressure introduction path that communicates with the connection path and introduces the hydraulic pressure in the connection path into the switching means to operate the switching means;
A vibration isolator, comprising: a thin film body disposed in the connection path and blocking communication between the main liquid chamber and the sub liquid chamber through the connection path. The vibration isolator according to claim 1,
The restriction passage is provided with a plurality of resonance frequencies different from each other,
The vibration isolator according to claim 1, wherein the switching means switches a restriction passage through which liquid flows in accordance with a fluid pressure in the connection passage introduced from the fluid pressure introduction passage. A vibration isolator according to claim 2,
The said switching means switches the communication between the main liquid chamber and the sub liquid chamber through the first restriction passage having the smallest flow resistance among the plurality of restriction passages, and switches it off. A vibration isolator according to claim 3,
The plurality of restriction passages and the first restriction passage have a resonance frequency that is a second vibration frequency lower than the first vibration that causes liquid column resonance in the first restriction passage when input. 2 restriction passages,
The anti-vibration device according to claim 1, wherein the thin film body is configured to elastically deform so as to cause liquid column resonance in the connection path when the first vibration is input. A vibration isolator according to claim 4,
The vibration isolator according to claim 1, wherein the first vibration is an idle vibration, and the second vibration is a shake vibration. The vibration isolator according to claim 5,
The partition member is formed with a cylinder chamber that communicates with the auxiliary liquid chamber, and a passage opening that forms part of the first restriction passage and communicates the cylinder chamber and the main liquid chamber,
The switching means includes a piston member disposed in the cylinder chamber,
The piston member is
A passage space that constitutes a part of the first restriction passage and communicates with the auxiliary liquid chamber, and is isolated from the first restriction passage and communicates with the connection passage through the fluid pressure introduction passage. A pressure space and a partition section partitioned into
The sliding part is disposed on the side of the passage space along the expansion / contraction direction of the passage space and the pressurizing space with respect to the partition portion, and a through opening is formed, and the inside constitutes a part of the first restriction passage A tube part;
And is slidable in the expansion / contraction direction in the cylinder chamber,
In the sliding cylinder portion, a portion located closer to the passage space along the expansion / contraction direction than the through-opening closes the passage opening. The vibration isolator according to claim 6,
The piston member is slid toward the passage space along the expansion / contraction direction until a portion of the piston member located on the pressure space side along the expansion / contraction direction with respect to the through-opening closes the passage opening. An anti-vibration device that is movably disposed in the cylinder chamber.

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