JP2014052045A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device which satisfactorily exhibits attenuation absorbing performance.SOLUTION: In a vibration control device, a membrane chamber 112 which is respectively communicated with a main liquid chamber and an auxiliary liquid chamber through a communication hole 111 extending in the axial direction and stores a membrane 116 therein is provided on a partitioning member 8. The membrane 116 is relatively displaceably stored in the axial direction with respect to the partitioning member 8 in the membrane chamber 112 so as to close the communication hole 111 when resonant oscillation which causes liquid column resonance in an opening and closing limit passage 70 is inputted in the axial direction, and so as to open the communication hole 111 when anti-resonance oscillation which causes anti-resonance in the opening and closing limit passage 70 is inputted in the axial direction.

Description

  The present invention relates to a vibration isolator.

  Conventionally, for example, a vibration isolator as shown in Patent Document 1 below is known. The vibration isolator includes a cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, a second mounting member coupled to the other, a first mounting member, and a second mounting unit. An elastic body that elastically connects the mounting member; a liquid chamber in the first mounting member in which a liquid is sealed; a main liquid chamber on one side and a sub liquid chamber on the other side having the elastic body as a part of a wall surface; And a partition member for partitioning. The partition member communicates with the main liquid chamber and the sub liquid chamber to cause liquid column resonance with respect to vibration input, attenuates and absorbs vibration, and includes a plurality of restriction passages having different resonance frequencies, and a plurality of Of the restriction passages, switching means for switching between communication and blocking between the main liquid chamber and the sub liquid chamber through the open / close restriction passage having the smallest flow resistance, a connection path for connecting the main liquid chamber and the sub liquid chamber, A thin film body that is disposed in the connection path and blocks the communication between the main liquid chamber and the sub liquid chamber through the connection path, and communicates with the connection path, and introduces the liquid pressure in the connection path to the switching means. And a hydraulic pressure introduction path for operating the switching means.

  Here, in the vibration isolator, when the anti-resonance vibration that causes anti-resonance in the open / close restriction passage is input in a state where the main liquid chamber and the sub liquid chamber are communicated through the open / close restriction passage, the thin film body is The hydraulic pressure fluctuates in the connection path due to elastic deformation, and this hydraulic pressure fluctuation is introduced into the switching means through the hydraulic pressure introduction path, so that the switching means is activated and the open / close restriction passage is closed, and the open / close restriction passage is closed. The occurrence of anti-resonance at is suppressed.

JP 2011-163446 A

  However, in the conventional vibration isolator, it takes time from the input of anti-resonance vibration until the opening / closing restriction passage is closed, and anti-resonance is likely to occur in the opening / closing restriction passage. There was a possibility that the spring constant would rise and affect the damping absorption performance.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the vibration isolator which can exhibit attenuation | damping absorption performance satisfactorily.

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 for connecting 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 and a liquid chamber on the other side having the elastic body as a part of a wall surface. A partition member that divides into a sub liquid chamber, and the partition member communicates with the main liquid chamber and the sub liquid chamber to cause liquid column resonance with respect to vibration input, thereby damping and absorbing the vibration. A plurality of restriction passages having different resonance frequencies, and a switching means for switching between communication and blocking of the main liquid chamber and the sub liquid chamber through the open / close restriction passage having the smallest flow resistance among the plurality of restriction passages, A connection path connecting the liquid chamber and the sub-liquid chamber, and a main passage through the connection path A thin film body that blocks communication between the chamber and the auxiliary liquid chamber, and a fluid pressure introduction path that communicates with the connection path and that introduces the fluid pressure in the connection path into the switching means to operate the switching means. A liquid-sealed vibration isolator provided, wherein the partition member communicates with each of the main liquid chamber and the sub liquid chamber through a communication hole extending in the axial direction, and the membrane chamber in which the membrane is accommodated The membrane closes the communication hole when resonance vibration that causes liquid column resonance in the open / close restricted passage is input in the axial direction, and causes anti-resonance in the open / close restricted passage. The membrane chamber is accommodated so as to be relatively displaceable in the axial direction with respect to the partition member so as to open the communication hole when anti-resonance vibration is input in the axial direction. To do.

In this invention, when resonance vibration is input in a state where the main liquid chamber and the sub liquid chamber communicate with each other through the open / close restriction passage, the membrane is pivoted with respect to the partition member in the membrane chamber so as to close the communication hole. The liquid is relatively displaced in the direction, and the flow of the liquid between the main liquid chamber and the sub liquid chamber through the communication hole and the membrane chamber is restricted. Therefore, the liquid actively flows through the opening / closing restriction passage, and liquid column resonance occurs in the opening / closing restriction passage, so that the damping absorption performance is exhibited.
On the other hand, when anti-resonance vibration is input in a state where the main liquid chamber and the sub liquid chamber communicate with each other through the opening / closing restriction passage, the membrane is axially moved with respect to the partition member in the membrane chamber so as to open the communication hole. Thus, the liquid is allowed to flow between the main liquid chamber and the sub liquid chamber through the communication hole and the membrane chamber. Accordingly, the liquid actively flows through the communication hole and the membrane chamber, and the flow of the liquid in the open / close restricted passage is suppressed, and the occurrence of anti-resonance in the open / close restricted passage is suppressed.
As described above, when the resonance vibration is input and when the anti-resonance vibration is input, the aspect of the displacement of the membrane in the membrane chamber that changes due to the difference in the frequency of the input vibration is used. Therefore, it is possible to switch between regulation and allowance of liquid flow through the communication hole and the membrane chamber, so that when anti-resonance vibration is input, the liquid flow in the open / close restricted passage is suppressed with high responsiveness. It is possible to suppress the increase of the dynamic spring constant of the vibration isolator and to exhibit the damping absorption performance satisfactorily.

  According to the vibration isolator which concerns on this invention, attenuation | damping absorption performance can be exhibited favorably.

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 longitudinal cross-sectional view of the partition member shown in FIG. It is a schematic diagram which shows the vibration isolator shown in FIG. It is a graph which shows the result about the verification test of the effect of this invention. It is a graph which shows the result about the verification test of the effect of this invention.

Hereinafter, with reference to the drawings, a liquid-sealed vibration isolator according to an embodiment of the present invention will be described.
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 the central axis O, the direction along the central axis O is referred to as the axial direction, the main liquid chamber 6 side with respect to the partition member 8 along the axial direction is referred to as one side, and the auxiliary liquid chamber 7 side. Is called the other side, the direction perpendicular to the central axis O is called the radial direction, and the direction around the central axis O is called the circumferential direction.

As for the 1st attachment member 2, the one side cylinder part 10 located in one side, and the other side cylinder part 11 located in the other side are mutually fixed with the volt | bolt 12. As shown in FIG.
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 cylinder part 10 includes a peripheral wall part 18 to which the outer ring part 16 of the other side cylinder part 11 is fixed, an annular body part 19 projecting radially outward from one end of the peripheral wall part 18, and It has.
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. The partition member 8 is formed with a screw hole that opens toward one side, and the pressing plate 31 and the membrane plate 32 are each formed with an insertion hole penetrating in the axial direction. The membrane plate 32 is assembled to the partition member main body 30 by a fixing bolt 35 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.

  As shown in FIG. 2, the partition member 8 includes restriction passages 70 and 71 that connect the main liquid chamber 6 and the sub-liquid chamber 7 and cause liquid column resonance with respect to vibration input to attenuate and absorb vibration. A connection path 74 that connects the main liquid chamber 6 and the sub liquid chamber 7, and a thin film body 73 that blocks communication between the main liquid chamber 6 and the sub liquid chamber 7 through the connection path 74. Yes. As the restriction passages 70 and 71, two (a plurality of) restriction passages 70 and 71 having different resonance frequencies are provided, and the resonance frequency is idle vibration (resonance vibration, first vibration) (for example, the frequency is 18 Hz to An idle orifice (opening / closing restriction passage, first restriction passage) 70 having a frequency of 30 Hz and an amplitude of ± 0.5 mm or less, and a shake vibration (second vibration) having a resonance frequency lower than the idle vibration (second vibration) (for example, And a shake orifice (second restricted passage) 71 having a frequency of 14 Hz or less and an amplitude of greater than ± 0.5 mm.

Here, in the present embodiment, 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 provided on the outer peripheral surface of the partition member main body 30. They are formed in this order from one side to the other side with an interval in the direction. Further, in the partition member main body 30, a cylinder chamber that extends in the axial direction and opens toward one side at a portion located radially inward of the three circumferential grooves 37, 38, 39 and the annular groove 67. 40, the thin film body chamber 41 and the orifice chamber 42, and the through hole 43 extending in the axial direction are formed in this order in the circumferential direction, and are adjacent to each other in the circumferential direction.
Of these, the orifice chamber 42, the second circumferential groove 38 and the cylinder chamber 40 constitute a part of the idle orifice 70, and the orifice chamber 42 and the third circumferential groove 39 constitute a part of the shake orifice 71. The thin film body chamber 41, the first circumferential groove 37 and the through hole 43 constitute a part of the connection path 74.

As shown in FIG. 1, the orifice chamber 42 includes a first orifice opening 61 and a second orifice opening formed at positions corresponding to the orifice chamber 42 in the axial direction in each of the pressing plate 31 and the membrane plate 32. 64 communicates with the main liquid chamber 6.
The orifice chamber 42 is formed at a depth equivalent to the third circumferential groove 39 in the axial direction, and is formed on the side wall surface defining the orifice chamber 42 and opens toward the outside in the radial direction. The second circumferential groove 38 and the third circumferential groove 39 communicate with each other through the 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 axial direction. 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 bottom wall holes 46 that are spaced apart so as to surround the periphery of the shaft portion 45 in a plan view and open toward the other side. It communicates with the auxiliary liquid chamber 7 through the bottom wall hole 46.

As shown in FIGS. 1 to 4, the idle orifice 70 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 toward the sub liquid chamber 7 side. The communication opening 53, the second circumferential groove 38, the second communication opening 50, a passage space 95 described later in the cylinder chamber 40, and the bottom wall hole 46 are configured in this order. The idle orifice 70 has the smallest flow path resistance among the plurality of restriction passages 70 and 71. 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 of the idle orifice 70 is smaller than the flow passage cross-sectional area of other portions, and is the smallest in the idle orifice 70.
In the idle orifice 70, anti-resonance occurs when anti-resonance vibration having a higher frequency than idle vibration (for example, frequency is 25 Hz to 50 Hz and amplitude is ± 0.5 mm or less).

As shown in FIG. 3, the second circumferential groove 38 and the third circumferential groove 39 are communicated 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.
The third circumferential groove 39 extends from the outer circumferential surface of the partition member main body 30 to the outer circumferential surface from the portion located outside the orifice chamber 42 in the radial direction to the portion located outside the radial direction of the through-hole 43. It extends to go around. 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.

  As shown in FIG. 1 to FIG. 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 toward the sub liquid chamber 7 side. The communication opening 53, the third circumferential groove 39, and the first communication notch 51 are configured in this order, and a part of the shake orifice 71 also serves as a part of the idle orifice 70. 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, the flow passage cross-sectional area of the third circumferential groove 39 in the shake orifice 71 is smaller than the flow passage cross-sectional area of other portions, and is the smallest in the shake orifice 71.

  As shown in FIG. 2, the thin film body chamber 41 can communicate 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 axial direction in the pressing plate 31. . As shown in FIG. 4, the thin film body chamber 41 is formed with a depth equivalent to the first circumferential groove 37 in the axial direction, and is formed on the side wall surface defining the thin film body chamber 41 in the radial direction. It communicates with the first circumferential groove 37 through a third communication opening 48 that opens outward.

As shown in FIG. 3, the first circumferential groove 37 is formed on the outer circumferential surface of the partition member body 30 from a portion located on the outer side in the radial direction of the thin film body chamber 41 to a portion located on the outer side in the radial direction 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.

  As shown in FIG. 1 to FIG. 3, the connection path 74 has a film opening 60, a thin film body chamber 41, a third communication opening 48, a first circumferential groove from the main liquid chamber 6 side to the sub liquid chamber 7 side. 37, the fourth communication opening 49, and the through hole 43. The thin film body chamber 41 constitutes an end portion of the connection path 74 on the main liquid chamber 6 side. In the illustrated example, the flow passage cross-sectional area of the first circumferential groove 37 in the connection path 74 is smaller than the flow path cross-sectional area of other portions, and the flow path cross-sectional area is the smallest in the connection path 74. ing.

  As shown in FIGS. 2 and 4, 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 axial direction. The thin film body 73 has a liquid column within the connection path 74 when an idle vibration is input, for example, by setting (tuning) the flow path length, the cross-sectional area of the flow path, and the elastic modulus of the thin film body 73 in advance. It is configured to elastically deform so as to cause resonance.

Here, as shown in FIG. 2, the partition member 8 communicates with the switching means 72 for switching the resonance frequencies of the restriction passages 70, 71 and the connection path 74, and introduces the hydraulic pressure in the connection path 74 to the switching means 72. Then, a hydraulic pressure introduction path 47 for operating the switching means 72 is further provided.
The hydraulic pressure introduction passage 47 opens from the portion located on the side of the auxiliary liquid chamber 7 relative to the thin film body 73 on the side wall surface defining the thin film body chamber 41 toward the cylinder chamber 40, and the thin film body chamber 41 and the cylinder chamber 40. In the example shown in the drawing, it is a notch that opens toward one side.

  As shown in FIG. 4, 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 switching means 72 switches communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 and blocking. In the non-input state, the switching means 72 blocks communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70, and when the fluid 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 restricts 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 axial direction (direction of expansion and contraction between the passage space and the pressurizing space), and a bottom wall surface defining the piston member 82 and the cylinder chamber 40 A coil spring 83 interposed therebetween.
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 axial direction and are arranged coaxially with the shaft portion 45. 94 is fitted.

  The piston member 82 communicates with the auxiliary liquid chamber 7 through the bottom wall hole 46 in the cylinder chamber 40, and forms a part of the idle orifice 70 on the other side (passage space side along the expansion / contraction direction), A partition ring portion (partition portion) 97 partitioned into a pressurizing space 96 on one side (pressurization space side along the expansion / contraction direction) communicating with the connection path 74 through the fluid pressure introduction path 47, and the partition ring portion 97 A sliding cylinder 98 that extends toward the other side of the outer peripheral edge of the inner ring 70 and the inside forms a part of the idle orifice 70, and a guide cylinder that extends from the inner peripheral edge of the partition ring part 97 toward the other side. Part 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 axial direction constitutes a part of the idle orifice 70 and also the axial direction of the second communication opening (passage opening) 50 that communicates the cylinder chamber 40 and the main liquid chamber 6. It is larger than the size along.
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.

Further, in the present embodiment, as shown in FIGS. 2 and 5, the partition member 8 communicates with the main liquid chamber 6 and the sub liquid chamber 7 through the communication hole 111 extending in the axial direction, and the membrane 116. A membrane chamber 112 is provided.
As shown in FIG. 2, the membrane chamber 112 and the communication hole 111 are arranged at positions where the plurality of restriction passages 70 and 71 and the connection passage 74 are avoided in the partition member 8. The membrane chamber 112 is disposed so as to protrude from the partition member 8 toward the one side (main liquid chamber side). The membrane chamber 112 is defined by the pressing plate 31 and a frame member 113 projecting from the portion corresponding to the through hole 43 in the axial direction (hereinafter referred to as a corresponding portion) toward the one side of the pressing plate 31. It is made.

The frame member 113 is formed in a hollow flat rectangular parallelepiped shape that opens toward the other side, and is connected to the pressing plate 31. The planar view shape of the frame member 113 follows the planar view shape of the through hole 43.
As shown in FIGS. 2 and 5, the communication hole 111 is formed in the corresponding portion of the pressing plate 31 and the top of the frame member 113, respectively. A plurality of communication holes 111 are arranged at intervals in the circumferential direction at these corresponding portions and top portions.

  As shown in FIG. 5, in the membrane plate 32, a membrane opening 114 that connects the communication hole 111 and the through hole 43 is formed at a position corresponding to the through hole 43 in the axial direction. The main liquid chamber 6 and the sub liquid chamber 7 are communicated with each other through a short-circuit space 115 including a communication hole 111, a membrane chamber 112, a membrane opening 114, and a through hole 43. The flow resistance of the short-circuit space 115 may be smaller than the flow resistance of the idle orifice 70.

  The planar view shape of the membrane 116 is larger than the planar view shape of the communication hole 111. The membrane 116 closes the communication hole 111 by contacting the inner surface of the membrane chamber 112. The membrane 116 is in contact with a portion of the inner surface of the membrane chamber 112 constituted by the corresponding portion of the holding plate 31, thereby closing all the communication holes 111 on the side of the sub liquid chamber 7, and the top of the frame member 113. All the communication holes 111 on the main liquid chamber 6 side are closed by abutting on the portion constituted by the above. The membrane 116 may be formed of, for example, a rubber material or other elastic material.

In the present embodiment, the membrane 116 closes the communication hole 111 when idle vibration is input in the axial direction, and opens the communication hole 111 when anti-resonance vibration is input in the axial direction. The chamber 112 is accommodated so as to be relatively displaceable in the axial direction with respect to the partition member 8.
The membrane 116 is similar to the shape of the internal space of the membrane chamber 112 and is smaller than the internal space. The area formed by the planar view shape of the membrane 116 is, for example, about 500 to 3000 mm ² , and the axial clearance between the membrane 116 and the inner surface of the membrane chamber 112 is, for example, about 0.1 to 0.5 mm. Yes.

  Next, the operation of the vibration isolator 1 configured as described above will be described. 6 is a diagram schematically showing 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. .

First, as shown in FIGS. 4 and 6, 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. When the hydraulic pressure at this time is introduced from the hydraulic pressure introduction path 47 into the pressurizing space 96, the switching unit 72 releases the disconnection of the communication between the main liquid chamber 6 and the sub liquid 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, 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 connected to the through opening 100 and the sliding. Communication is made through the inside of the cylindrical portion 98, and the disconnection of communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is released.
At this time, the membrane 116 is relatively displaced in the axial direction with respect to the partition member 8 in the membrane chamber 112 so as to abut against the inner surface of the membrane chamber 112 and close the communication hole 111, and the short-circuit space 115. The flow of the liquid L between the main liquid chamber 6 and the sub liquid chamber 7 through the (communication hole and membrane chamber) is regulated. For example, the membrane 116 may alternately close the communication hole 111 on the main liquid chamber 6 side and the communication hole 111 on the sub liquid chamber 7 side, or may continue to close either one of these communication holes 111. Good.

In this way, the disconnection of the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is released, and the liquid L between the main liquid chamber 6 and the sub liquid chamber 7 through the short-circuit space 115 is released. In a state where the flow of the liquid is restricted, the liquid L actively flows 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. It will be.
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.

  Thereafter, for example, when the rotational frequency of the engine is increased, the frequency of vibration input to the vibration isolator 1 is increased, and when the anti-resonance vibration is input to the vibration isolator 1, the membrane 116 is moved to the membrane chamber 112. The main liquid chamber 6 and the sub liquid chamber 7 are displaced relative to the partition member 8 in the axial direction in the membrane chamber 112 so as to be spaced apart from the inner surface of the membrane chamber 112 and pass through the short-circuit space 115. The liquid L is allowed to flow between the two. Then, the liquid L actively circulates through the short-circuit space 115, and the circulation of the liquid L in the idle orifice 70 is suppressed, and the occurrence of anti-resonance in the idle orifice 70 is suppressed. At this time, the membrane 116 may be displaced alternately on both sides in the axial direction, for example, while being separated from the inner surface of the membrane chamber 112.

On the other hand, when shake vibration is input instead of idle vibration, the hydraulic pressure fluctuation in the connection path 74 is reduced, and the hydraulic pressure in the connection path 74 is lowered from the increased state. However, the communication between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70 is blocked.
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 pressurized space 96 flows into the sub liquid chamber 7 through, for example, a gap (not shown) between the piston member 82 and the side wall surface defining the cylinder chamber 40 and the bottom wall hole 46. .
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, after the through-opening 100 of the sliding cylinder 98 and the second communication opening 50 of the partition member main body 30 communicate with each other, the piston member 82 continues to slide toward the other side and slides. When the other end edge of the portion 98 abuts against the stopper ring 101, the partition ring portion 97 of the piston member 82 (the portion located on the pressure space side along the expansion / contraction direction with respect to the through opening in the piston member) The two communication openings 50 are closed. 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, using the mode of displacement of the membrane 116 in the membrane chamber 112 that changes due to the difference in the frequency of the input vibration, Since it is possible to switch between regulation and allowance of the flow of the liquid L through the short space 115 between when the idle vibration is input and when the anti-resonance vibration is input, when the anti-resonance vibration is input The flow of the liquid L in the idle orifice 70 can be suppressed with high responsiveness, and an increase in the dynamic spring constant of the vibration isolator 1 can be suppressed and the damping absorption performance can be satisfactorily exhibited.

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, the anti-resonance is achieved in a state where the through-opening 100 of the sliding cylinder portion 98 and the second communication opening 50 of the partition member main body 30 communicate with each other and the main liquid chamber 6 and the sub-liquid chamber 7 communicate with each other through the idle orifice 70. When the vibration is input, the thin film body 73 is elastically deformed to change the hydraulic pressure in the connection path 74, and this hydraulic pressure fluctuation is introduced into the switching means 72 through the hydraulic pressure introduction path 47. 72 may be configured such that the piston member 82 slides toward the other side to close the second communication opening 50 and the switching means 72 closes the idle orifice 70. In this case, after the switching means 72 closes the idle orifice 70, the flow of the liquid L in the idle orifice 70 is reliably suppressed.

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, the switching means 72 is not limited to that shown in the above embodiment, and may be appropriately changed to another configuration for switching communication and blocking between the main liquid chamber 6 and the sub liquid chamber 7 through the idle orifice 70. .

  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 space extended along an axial 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 only has to 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 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 non-input state. 6 and the secondary liquid chamber 7 may be communicated, and the switching means 72 may be configured to switch the communication between the main liquid chamber 6 and the secondary liquid chamber 7 through the idle orifice 70 and blocking.

Moreover, in the said embodiment, although the membrane chamber 112 shall be arrange | positioned so that it may protrude toward the said one side from the partition member 8, it is not restricted to this.
Furthermore, in the above embodiment, there are a plurality of communication holes 111 for communicating the membrane chamber 112 and the main liquid chamber 6 and a plurality of communication holes 111 for communicating the membrane chamber 112 and the auxiliary liquid chamber 7, respectively. Not limited. For example, the number of the communication holes 111 for communicating the membrane chamber 112 and the main liquid chamber 6 and the number of the communication holes 111 for communicating the membrane chamber 112 and the auxiliary liquid chamber 7 may be one.

  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.

Next, the verification test about the effect demonstrated above was implemented.
In this verification test, two anti-vibration devices of a comparative example and an example were prepared. In the comparative example, a configuration in which the membrane was removed from the vibration isolator shown in FIG. 1 was adopted, and in the example, the vibration isolator shown in FIG. 1 was adopted. In these vibration isolators, the frequency of idle vibration is 18 Hz to 30 Hz.

As shown in the graphs of FIGS. 7 and 8, the vibration isolators of these comparative examples and examples have amplitudes of ± 0.05 mm (solid line), ± 0.1 mm (broken line), ± 0.2 mm ( Each vibration of the chain line) was input within a frequency range of 5 Hz to 50 Hz, and the dynamic spring constant of the vibration isolator when each vibration was input was measured.
FIG. 7 shows the result of the comparative example, and FIG. 8 shows the result of the example.
As shown in FIG. 7, in the comparative example, when an anti-resonance vibration that is a vibration in a frequency band of 30 Hz or higher, which is higher than the frequency of the idle vibration, is input, a large anti-resonance occurs and the dynamic spring constant increases greatly. It was confirmed. On the other hand, as shown in FIG. 8, in the example, even when anti-resonance vibration was input, the occurrence of anti-resonance was suppressed and the increase of the dynamic spring constant was suppressed compared to the comparative example. It was confirmed.

L ... Liquid, 1 ... Vibration isolator, 2 ... First mounting member, 3 ... Second mounting member, 4 ... Elastic body, 5 ... Liquid chamber, 6 ... Main liquid chamber, 7 ... Secondary liquid chamber, 8 ... Partition member , 47 ... Fluid pressure introduction passage, 70 ... Idle orifice (open / close restriction passage), 71 ... Shake orifice (restriction passage), 72 ... Switching means, 73 ... Thin film body, 74 ... Connection passage, 111 ... Communication hole, 112 ... Membrane Room 116 ... Membrane

Claims (1)

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 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 enclosed 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;
In the partition member,
A plurality of restricting passages having resonance frequencies different from each other while communicating the main liquid chamber and the sub liquid chamber to cause liquid column resonance with respect to the vibration input and to attenuate and absorb the vibration,
Of the plurality of restriction passages, switching means for switching communication between the main liquid chamber and the sub liquid chamber through the open / close restriction passage having the smallest flow resistance, and switching off,
A connection path connecting the main liquid chamber and the sub liquid chamber;
A thin film body that blocks communication between the main liquid chamber and the sub liquid chamber through the connection path;
A liquid-filled vibration isolator provided with a fluid pressure introduction path that communicates with the connection path and introduces the fluid pressure in the connection path into the switching means to operate the switching means;
The partition member is provided with a membrane chamber in which a membrane is accommodated while communicating with each of the main liquid chamber and the sub liquid chamber through a communication hole extending in the axial direction.
The membrane closes the communication hole when resonance vibration that causes liquid column resonance in the opening / closing restriction passage is input in the axial direction, and anti-resonance vibration that causes anti-resonance in the opening / closing restriction passage. The vibration isolator is accommodated in the membrane chamber so as to be relatively displaceable in the axial direction with respect to the partition member so as to open the communication hole when the is input in the axial direction. .

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