JP2008002618A - Fluid filled vibration isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid filled vibration isolating device having novel construction for advantageously developing vibration isolating effects based on the flowing action of filled non-compressive fluid while effectively suppressing the occurrence of shocking abnormal noises and vibration. <P>SOLUTION: In window portions 54, 68 formed on a wall portion of a storage space 78 of a partition member 40, at their portions located in opposition to the outer peripheral edge of a movable plate 80, a valve element 100 formed of an elastic material is arranged which is fixed to the partition member 40. On the other hand, at least the outer peripheral edge of the movable plate 80 located in opposition to the valve element 100 is formed of an elastic material and a cutout portion 104 is formed in the outer peripheral face of the movable plate 80. During the input of great amplitude vibration, the outer peripheral edge of the movable plate 80 is elastically deformed to abut on the valve element 100 and forcibly open the valve element 100, and then an opening passage 108 appears through a space to the movable plate 80 with the cutout portion 104. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid-filled vibration isolator that obtains a vibration-proof effect based on the flow action of a fluid sealed inside, and can be employed in, for example, an engine mount, body mount, and diff mount for automobiles. The present invention relates to a fluid-filled vibration isolator.

  Conventionally, as an anti-vibration device interposed between members constituting a vibration transmission system, a fluid-filled type anti-vibration using a vibration-proof effect based on a fluid action such as a resonance action of an incompressible fluid enclosed therein is used. Shaking devices are known. Such an anti-vibration device generally connects a first attachment member and a second attachment member with a main rubber elastic body, while fixing a partition member to the second attachment member and walls on both sides of the partition member. A part of the pressure part is made of a rubber elastic body and an equilibrium room part of the wall part is made of a flexible membrane. In addition to enclosing the fluid, the structure is provided with an orifice passage that communicates the two chambers with each other.

  Such a fluid filled type vibration damping device can obtain a particularly effective vibration damping effect in the tuning frequency range of the orifice passage. Therefore, for example, application to an engine mount for automobiles that require a high level of vibration isolation performance against vibrations in a specific frequency range such as idling vibration and engine shake has been studied.

  However, in such a fluid-filled vibration isolator having a conventional structure, when vibration in a frequency range higher than the tuning frequency of the orifice passage is input, the orifice passage is substantially clogged, that is, through the orifice passage. As a result, it is difficult to cause the fluid flow action to occur, so that a high dynamic spring is caused. As a result, there is a problem that the vibration isolation performance is lowered.

  Therefore, in order to deal with such a problem, for example, as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2000-104783), a predetermined amount in the thickness direction with respect to the accommodation space provided in the partition member The movable plate is accommodated and arranged so as to be displaceable with a gap of, and through holes are formed to connect the accommodation space to the pressure receiving chamber and the equilibrium chamber, respectively, through which the pressure in the pressure receiving chamber is exerted on one surface of the movable plate. In addition, a fluid filled type vibration isolator has been proposed in which the pressure in the equilibrium chamber is exerted on the other surface of the movable plate. According to such a structure, when a vibration in a frequency range higher than the tuning frequency of the orifice passage is input, a hydraulic pressure absorbing action is exerted based on the displacement of the movable plate, so that a high dynamic spring is realized due to the closed state of the orifice passage. Is avoided, and the desired anti-vibration effect can be stably obtained.

  By the way, in the fluid-filled vibration isolator of the conventional structure shown in Patent Document 1 or the like, if a large vibration load is input between the first attachment member and the second attachment member, Vibration may be emitted. Specifically, in an automobile that employs a fluid-filled vibration isolator as an engine mount, when traveling on a wavy road, a speed breaker, etc., there is a risk of generating abnormal noise or impact that can be felt by the passenger in the passenger compartment. .

  The occurrence of such abnormal noise and vibration is that when shocking vibration is input, the fluid flow between the pressure receiving chamber and the equilibrium chamber through the orifice passage cannot follow, and a significant negative pressure is instantaneously generated in the pressure receiving chamber. This is considered to be caused by the formation of bubbles that can be understood as cavitation due to liberation and evaporation of dissolved gas from the sealed fluid. In particular, when such shocking vibration is input, the movable plate abuts against the wall portion of the partition member and closes the through hole, and the pressure receiving chamber and the equilibrium chamber are closed together. It is understood that the negative pressure state is difficult to be resolved. Such bubbles generate a large impact when they collapse after growing in the pressure receiving chamber. This is considered to be the water hammer pressure, propagated to the first mounting member and the second mounting member, and transmitted to the body of the automobile, thereby generating abnormal noise and impact as described above.

  In order to cope with such a problem, for example, in Patent Document 2 (Japanese Patent Laid-Open No. 09-42372), a partition member is provided with a through hole that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other, and an edge of the through hole is provided. There has been proposed a structure in which a movable plate is fitted into a portion under a preload and elastically supported. In such a structure, a gap is generated between the edge of the movable plate and the edge of the through hole as the movable plate is greatly elastically deformed when a large amplitude vibration in question is input. Thereby, it is possible to eliminate the excessive negative pressure state of the pressure receiving chamber by releasing the hydraulic pressure through the gap.

  However, it is difficult to adjust the amount of elastic deformation of the movable plate simply by fitting and supporting the movable plate in the through hole. For this reason, there is a possibility that a gap is generated due to deformation of the movable plate when amplitude vibration of a normal size is input, and the vibration isolation performance based on the hydraulic pressure absorption action of the movable plate and the resonance action of the orifice passage may not be obtained stably. There is a problem that it is difficult to reliably short-circuit the pressure receiving chamber and the equilibrium chamber due to deformation of the movable plate when large amplitude vibration is input.

JP 2000-104783 A JP 09-42372 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the vibration isolation effect based on the flow action of the enclosed incompressible fluid can be advantageously exhibited. An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure capable of effectively suppressing the occurrence of shocking abnormal noise and vibration.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the feature of the present invention is that the first attachment member attached to one member to be vibration-proof connected and the second attachment member attached to the other member to be anti-vibration connected are spaced apart from each other. A pressure receiving device in which a partition member is fixedly supported by the second mounting member and a part of the wall portion is composed of the body rubber elastic body on both sides of the partition member while being coupled by the body rubber elastic body. The chamber and a part of the wall form an equilibrium chamber composed of a flexible membrane, enclose an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and communicate the pressure receiving chamber and the equilibrium chamber with each other. An orifice passage is formed, and a movable plate is accommodated in an accommodation space provided in the partition member. The pressure in the pressure receiving chamber and the equilibrium chamber is exerted on both sides of the movable plate, and the liquid is based on the displacement of the movable plate. For fluid-filled vibration isolator that exhibits pressure absorption function In addition, a window portion is formed in the wall portion of the accommodation space in the partition member, and the pressure in the pressure receiving chamber and the equilibrium chamber is exerted on one surface of the movable plate through the window portion. In addition, a valve body made of an elastic body is disposed at a portion of the window portion facing the outer peripheral edge of the movable plate and fixed to the partition member, while the movable plate is opposed to the valve body. At least the outer peripheral edge portion is formed of an elastic body, and a cut portion is formed on the outer peripheral surface of the movable plate, and the outer peripheral edge portion of the movable plate is elastically deformed when a large amplitude vibration is input, and the valve body The valve body is pushed open by being in contact with the opening, and an opening passage through the movable plate is developed by the cut portion.

  In the fluid-filled vibration isolator having the structure according to the present invention, the pressure receiving chamber and the equilibrium chamber are leaked through the opening passage when a large amplitude vibration that causes cavitation bubbles is generated. Excessive negative pressure is eliminated. As a result, the generation of cavitation bubbles due to an excessive negative pressure state in the pressure receiving chamber is suppressed, and a shocking and large noise that becomes a problem is prevented.

  In particular, since the cut portion is formed on the outer peripheral surface of the movable plate, the opening passage is stabilized by the cut portion even when the outer peripheral edge of the movable plate is in close contact with the valve body and pushed open. To express.

  Further, since the valve body made of an elastic body is formed independently of the movable plate, the spring stiffness of the valve body and the spring stiffness of the movable plate are set separately. As a result, the displacement characteristics of the movable plate and the deformation characteristics of the valve body are highly tuned, respectively, so that the hydraulic pressure absorbing action based on the displacement of the movable plate itself and the normal amplitude vibration input. The fluid tightness of the pressure receiving chamber and the equilibrium chamber can be improved by stably closing the cut portion of the movable plate based on the spring stiffness. In addition, the operability of elastically deforming and pushing open the valve body by elastic deformation of the outer peripheral edge portion of the movable plate at the time of a large amplitude vibration in question is advantageously adjusted.

  Furthermore, since the opening passage appears on the outer peripheral edge side of the movable plate, the circumferential length of the opening passage is sufficiently long. As a result, the hydraulic pressure escapes efficiently through the opening passage, and the excessive negative pressure state of the pressure receiving chamber is advantageously eliminated.

  Therefore, at the time of normal amplitude vibration input, the fluid tightness between the movable plate and the window is ensured, and the desired anti-vibration effect can be obtained stably, as well as a large problem. At the time of input of amplitude vibration, the opening passage is effectively developed, and abnormal noise caused by the generation of cavitation bubbles is effectively suppressed.

  Further, in the fluid filled type vibration damping device according to the present invention, the valve body is fixed to the outer peripheral edge portion of the window portion of the partition member and extends from the outer peripheral edge portion of the window portion into the window portion. A structure in which the distal end portion of the valve body extending into the window portion is a free end is suitably employed.

  According to such a structure, the valve body can be deformed so as to fall down from the fixed end toward the free end, and the deformation direction of the valve body is stabilized. Further, even if the deformation amount of the outer peripheral edge of the movable plate is relatively small, the valve body can be easily pushed open. Therefore, the operability of pushing the valve body open by the outer peripheral edge of the movable plate can be realized more advantageously.

  In particular, since the outer peripheral edge of the movable plate is positioned opposite to the part away from the free end of the valve body, when the amplitude vibration of the normal size is input, the edge part of the window part and the tip part of the valve body The escape of the hydraulic pressure through the cut portion of the outer peripheral surface of the movable plate is suppressed. Thereby, the vibration isolation effect based on the resonance action of the fluid through the orifice passage and the vibration isolation effect based on the hydraulic pressure absorption action by the movable plate can be obtained more stably.

  Moreover, in the fluid filled type vibration damping device according to the present invention, a contact protrusion that protrudes from at least one side toward the other side at a portion of the valve body facing the free end and the movable plate. A structure in which is formed is preferably employed. In such a structure, the fluid-tightness between the front-end | tip part of a valve body and a movable plate can be improved when the front-end | tip part of a valve body and the opposing part of a movable plate contact | abut via a contact protrusion. Therefore, the vibration isolation effect based on the resonance action of the fluid through the orifice passage and the vibration isolation effect based on the hydraulic pressure absorption action by the movable plate can be obtained more stably. In addition, the contact portion between the distal end portion of the valve body and the movable plate via the contact protrusion reduces the contact area and suppresses the generation of a large hitting sound associated with the contact.

  In the fluid filled type vibration damping device according to the present invention, a structure in which the cut portions are formed at equal intervals on the circumference of the outer peripheral surface of the movable plate is suitably employed. According to such a structure, when the movable plate is assembled to the partition member, it is not necessary to align the notch portion and the valve body at a specific location in the circumferential direction, and the manufacture is facilitated.

  In the fluid filled type vibration isolator according to the present invention, a structure in which a protrusion protruding toward the valve body is provided on the outer peripheral edge of the movable plate is suitably employed. In such a structure, the outer peripheral edge of the movable plate abuts on the valve body via the protrusion, so that the valve body can be easily opened even if the deformation amount of the outer peripheral edge of the movable plate is relatively small. I can do it. Further, when the movable plate is displaced and abuts against the partition member, the contact area is reduced by abutting via the protrusion, and the hitting sound associated with the abutment can be advantageously reduced.

  More preferably, a structure is adopted in which the cut portion of the outer peripheral surface of the movable plate includes the protrusion provided on the outer peripheral edge of the movable plate. As a result, the opening passage appears also from the portion where the protrusion and the valve body are in close contact with each other, so that the opening degree of the opening passage (the size of the opening) is further increased. As a result, the hydraulic pressure through the opening passage is increased. Is effectively eliminated, and the large pressure reduction state of the pressure receiving chamber is more advantageously eliminated.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. 1 and 2 show an automobile engine mount 10 as an embodiment of the present invention. The engine mount 10 includes a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member that are spaced apart from each other. Two mounting brackets 14 are elastically connected to each other by a main rubber elastic body 16. The mount 10 is attached to a power unit of an automobile as one member to which the first mounting bracket 12 is vibration-proof connected, and is mounted to the vehicle body as the other member to which the second mounting bracket 14 is vibration-proof connected. As a result, the power unit is attached to the automobile and is supported in a vibration-proof manner in a suspended state with respect to the vehicle body. Under such a mounted state, the load supporting load of the power unit is applied to the mount 10, and the first mounting bracket 12 and the second mounting bracket 14 are relatively displaced in the vertical direction in FIG. 1 is elastically deformed, and the main vibration to be damped is input in the vertical direction in FIG. 1 which is the mount axis direction. In the following description, the vertical direction refers to the vertical direction in FIG. 1 unless otherwise specified.

  More specifically, the first mounting bracket 12 includes a cup-shaped portion 18 having a substantially bottomed cylindrical shape that opens upward, and a nut portion 20 that is fixed to the center of the bottom of the cup-shaped portion 18 and extends downward. Has been. The first mounting bracket 12 is fixed to the power unit by being bolted to a power unit side mounting member (not shown) via a fixing bolt screwed to the nut portion 20.

  On the other hand, the second mounting bracket 14 has a large-diameter, generally cylindrical shape. A ring-shaped caulking portion 24 extending upward is integrally formed in an opening portion of one of the second mounting brackets 14 (upper in FIG. 1) via an annular step portion 22 spreading in the radial direction. Yes. In the other opening (lower in FIG. 1) of the second mounting member 14, a tapered portion 26 whose diameter is gradually decreased downward is provided. The second mounting bracket 14 is press-fitted into a cylindrical mounting bracket (not shown), and a plurality of legs fixed to the bracket are fixed to the vehicle body side member with bolts or the like, so that the second mounting The metal fitting 14 is fixed to the vehicle body.

  The first mounting bracket 12 is inserted into the second mounting bracket 14 so that both the brackets 12 and 14 are positioned substantially coaxially and are opposed to each other with a predetermined distance in the radial direction. Yes. The cup-shaped portion 18 of the first mounting bracket 12 is positioned at a substantially central portion in the axial direction of the second mounting bracket 14, and the tip portion of the nut portion 20 of the first mounting bracket 12 is It protrudes outward from the lower opening of the mounting bracket 14. A main rubber elastic body 16 is disposed between the first mounting bracket 12 and the second mounting bracket 14.

  The main rubber elastic body 16 has a substantially cylindrical shape with a taper that expands downward. The entire outer peripheral surface of the cup-shaped portion 18 of the first mounting bracket 12 and the outer peripheral surface of the upper portion of the nut portion 20 are vulcanized and bonded to the inner peripheral surface of the small diameter side end portion of the main rubber elastic body 16. The inner peripheral surface of the tapered portion 26 of the second mounting bracket 14 is vulcanized and bonded to the outer peripheral surface of the large-diameter end of the main rubber elastic body 16. In short, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14, thereby the first mounting bracket 12 and the second mounting bracket 14. The metal fittings 14 are elastically connected to each other by the main rubber elastic body 16, and the other opening (lower in FIG. 1) of the second mounting metal fitting 14 is covered with the main rubber elastic body 16 in a fluid-tight manner. . A thin seal rubber layer 28 integrally formed with the main rubber elastic body 16 is attached to the inner peripheral surface from the intermediate portion in the axial direction of the second mounting member 14 to the step portion 22.

  In addition, a diaphragm 30 as a flexible film is disposed in one opening (upper in FIG. 1) of the second mounting bracket 14. The diaphragm 30 can be easily deformed by exhibiting a disk shape made of a thin rubber film with a slack, and a large-diameter ring-shaped fixing bracket 32 is fixed to the outer peripheral edge. The fixing bracket 32 has an inner flange-shaped portion 34 that extends radially inward at one end (upper in FIG. 1) and an outer flange-shaped portion 36 that extends radially outward at the other end. In preparation. The outer peripheral edge portion of the diaphragm 30 is vulcanized and bonded to the inner peripheral edge portion of the inner flange-shaped portion 34. In addition, a thin seal rubber layer 38 integrally formed with the diaphragm 30 is attached to substantially the entire inner peripheral surface from the inner flange-shaped portion 34 to the outer flange-shaped portion 36 of the fixture 32.

  The fixing bracket 32 is fitted from one opening (upper in FIG. 1) of the second mounting bracket 14 so that the outer flange-shaped portion 36 of the fixing bracket 32 is inside the caulking portion 24 of the second mounting bracket 14. As the caulking portion 24 is caulked, the fixing bracket 32 is fixed to the second mounting bracket 14. As a result, the diaphragm 30 is fixed to the second mounting bracket 14, and the other opening of the second mounting bracket 14 is covered with the diaphragm 30 in a fluid-tight manner.

  Further, a partition member 40 is accommodated between the main rubber elastic body 16 and the diaphragm 30 inside the second mounting bracket 14. As shown in FIG. 2, the partition member 40 has a thick, substantially disk shape as a whole, and is formed using a metal material in the present embodiment. It may be formed using a resin material or the like. The partition member 40 includes a first partition fitting 42 and a second partition fitting 44.

  As shown in FIGS. 3 and 4, the first partition member 42 has a thick disk shape. A small recess 46 that opens downward and a large recess 48 that opens upward are formed in the central portion of the first partition member 42. The small recess 46 and the large recess 48 extend in a circular concave shape from a substantially central portion in the thickness direction of the first partition member 42 toward each end face. Thereby, the central part of the thickness direction of the 1st partition metal fitting 42 is made into the disk wall part 50 which exhibits a thin disk shape. The outer diameter of the small recess 46 is smaller than the outer diameter of the large recess 48.

  A central hole 52 that opens downward is recessed in the central portion of the disc wall portion 50 of the first partition member 42. In addition, a through hole 54 including a plurality of holes is provided around the central hole 52 in the disk wall portion 50. Specifically, the through holes 54 include four substantially fan-shaped small holes 56 disposed at equal intervals around the central hole 52 and a substantially trapezoidal large shape disposed at equal intervals around the small holes 56. It is configured to include eight holes 58.

  A plurality of (10 in the present embodiment) positioning projections 60 project downward from the annular end portion around the opening of the small recess 46 of the first partition fitting 42. Some of the plurality of positioning protrusions 60 are arranged at unequal intervals in the circumferential direction, the radial direction, and the like.

  Further, a partition wall portion 62 having a substantially rectangular flat plate shape protrudes radially outward at one place on the circumference of the peripheral wall portion of the first partition fitting 42. Further, a notch-shaped communication window 64 is provided through one side of the circumferential wall portion of the first partition fitting 42 in the circumferential direction across the partition wall portion 62. Through the communication window 64, the outer peripheral side of the first partition member 42 and the inside of the small recess 46 are communicated with each other.

  On the other hand, as shown in FIG. 5, the second partition member 44 has a thin, substantially disk shape, and its outer diameter dimension is larger than the outer diameter dimension of the first partition member 42. Has been. Further, a small-diameter central hole 66 is provided in the central portion of the second partition metal fitting 44. In addition, a through hole 68 including a plurality of holes is provided around the central hole 66 in the second partition metal fitting 44. Specifically, the through-hole 68 has four substantially fan-shaped small holes 70 arranged at equal intervals around the central hole 66 and a substantially trapezoidal large shape arranged at equal intervals around the small holes 70. It is configured to include eight holes 72.

  In addition, a plurality of positioning holes 74 are provided on the outer peripheral side of the through hole 68 in the second partition member 44. These positioning holes 74 are arranged at unequal intervals in the circumferential direction, the radial direction, and the like, and are provided at positions corresponding to the positioning protrusions 60 of the first partition fitting 42.

  Further, a long hole-shaped communication hole 76 is provided through the outer peripheral portion of the second partition fitting 44 in the thickness direction. In the present embodiment, one edge of the plurality of positioning holes 74 opens to the edge of the communication hole 76.

  Such a second partition 44 is superimposed on the first partition 42 from the opening side of the small recess 46 of the first partition 42, and a plurality of positioning projections 60 of the first partition 42 are provided. The second partition fittings 44 are fitted into the corresponding positioning holes 74 respectively. As a result, the small recess 46 of the first partition member 42 is covered with the second partition member 44, and the first partition member 42 and the second partition member 44 are positioned on the concentric axis. Is configured. By positioning these positioning projections 60 in the positioning holes 74, the first partition fitting 42 and the second partition fitting 44 are positioned in the circumferential direction, and the partition wall portion 62 of the first partition fitting 42 is moved. A communication hole 76 of the second partition member 44 is located on the opposite side of the first partition member 42 from the communication window 64. Further, a circular accommodation space 78 is formed inside the partition member 40 based on the fact that the small recess 46 of the first partition member 42 is covered with the second partition member 44. In this accommodation space 78, an elastic rubber plate 80 as a movable plate is accommodated.

  As shown in FIG. 6, the elastic rubber plate 80 has a substantially disk shape made of a rubber elastic material. A small central convex portion 82 projects vertically from the central portion of the elastic rubber plate 80. In particular, in the present embodiment, a region that extends in a circular shape with a predetermined size in the central portion of the elastic rubber plate 80 is a central disk-shaped portion 84 having a substantially constant thickness throughout. Further, an annular region 86 having a predetermined size and expanding in an annular shape in the outer peripheral portion of the elastic rubber plate 80 is thinned toward the outer peripheral side, and is curved up and down in a corrugated shape in the circumferential direction. Has been. The central disc-shaped portion 84 and the outer peripheral annular portion 86 are integrally connected by an annular thin intermediate portion 88. The thickness of the intermediate thin portion 88 is substantially constant throughout, and is sufficiently smaller than the thickness of the central disc 84 and the minimum thickness of the outer annular portion 86. Has been.

  Further, an annular seal lip 90 is integrally formed on the upper and lower end surfaces of the central disk-shaped portion 84, and a plurality of strips (two strips on each end surface in the present embodiment) are spaced at a predetermined distance in the radial direction. )

  Furthermore, an annular contact protrusion 92 that protrudes vertically is integrally formed on the inner peripheral edge of the outer peripheral annular portion 86. The contact protrusion 92 according to the present embodiment has a substantially constant semicircular cross section and continuously extends over the entire circumference in the circumferential direction, but may be divided in the circumferential direction.

  Such an elastic rubber plate 80 is placed in the accommodation space 78 of the partition member 40, and the central convex portion 82 above the elastic rubber plate 80 is fitted into the central hole 52 of the first partition fitting 42 and is elastic. The central convex portion 82 below the rubber plate 80 is inserted into the central hole 66 of the second partition member 44, so that the central axis of the elastic rubber plate 80 is positioned on the central axis of the accommodation space 78. Yes.

  Further, the plurality of seal lips 90 in the central disc-shaped portion 84 of the elastic rubber plate 80 abuts on the disc wall portion 50 of the first partition fitting 42 and the central portion of the second partition fitting 44, so that the elastic rubber plate 80 It is pinched and deformed in the thickness direction (up and down in FIG. 1). Thereby, the displacement in the accommodation space 78 of the center disk-shaped part 84 of the elastic rubber plate 80 is restrained.

  Furthermore, the outer peripheral edge portion of the outer peripheral annular portion 86 of the elastic rubber plate 80 extends in the radial direction (mount) along the peripheral wall portion of the small recess 46 of the first partition fitting 42 constituting the peripheral wall portion of the accommodation space 78 and the entire circumference. 10 in a direction perpendicular to the axis 10) at a predetermined distance. In addition, the outer peripheral annular portion 86 and the intermediate thin portion 88 have a predetermined distance in the thickness direction of the elastic rubber plate 80 with respect to the outer peripheral portion of the disk wall portion 50 of the first partition member 42 and the second partition member 44, respectively. Opposite positions are spaced apart. In the present embodiment, the upper and lower contact protrusions 92, 92 protruding from the outer peripheral annular portion 86 abut on the outer peripheral portion of the disc wall portion 50 of the first partition member 42 and the second partition member 44. However, it is not greatly deformed by pinching. Thereby, in the accommodation space 78, elastic deformation and displacement of the intermediate thin wall portion 88 and the outer peripheral annular portion 86 located at the outer peripheral portion of the elastic rubber plate 80 are allowed, and the outer peripheral annular portion 86 becomes the first partition fitting. 42 or the second partition metal 44, or the contact protrusion 92 of the elastic rubber plate 80 is greatly compressed and deformed with respect to the first partition metal 42 or the second partition metal 44. The elastic deformation and displacement of 88 and the outer peripheral annular portion 86 are limited.

  Thus, the partition member 40 to which the elastic rubber plate 80 is assembled is accommodated between the second mounting bracket 14 and the fixing bracket 32 of the diaphragm 30. That is, the partition member 40 is fitted from one opening (upper in FIG. 1) of the second mounting bracket 14, and the outer peripheral portion of the second partitioning bracket 44 is in the caulking portion 24 of the second mounting bracket 14. And is superposed on the stepped portion 22 of the second mounting bracket 14. In addition, the integral vulcanization molded product of the diaphragm 30 having the fixing bracket 32 is covered from above the partition member 40, and the outer flange-shaped portion 36 of the fixing bracket 32 is placed in the caulking portion 24 of the second mounting bracket 14. It is positioned and overlapped with the outer peripheral portion of the second partition fitting 44 through the seal rubber layer 38, and the inner flange-shaped portion 34 of the fixing fitting 32 is further passed through the seal rubber layer 38 to the first partition fitting. It is superimposed on the upper end of 42. The caulking portion 24 is subjected to caulking so that the partition member 40 is sandwiched between the fixing bracket 32 and the step portion 22 of the second mounting bracket 14, so that the second mounting bracket 14 is fixed. And is supported in a fixed manner.

  Thereby, the partition member 40 is arranged so as to spread in the direction perpendicular to the axis inside the mount 10, and on one side (lower in FIG. 1) sandwiching the partition member 40 inside the second mounting bracket 14, A pressure receiving chamber 94 is formed in which a part of the wall portion is constituted by the main rubber elastic body 16 and a pressure fluctuation is caused based on elastic deformation of the main rubber elastic body 16. Further, on the other side (the upper side in FIG. 1) sandwiching the partition member 40 inside the second mounting bracket 14, a part of the wall portion is constituted by the diaphragm 30, and based on the elastic deformation of the diaphragm 30. An equilibrium chamber 96 is formed in which volume changes are easily allowed. The pressure receiving chamber 94 and the equilibrium chamber 96 are filled with an incompressible fluid. As the sealing fluid, for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is employed, and in order to effectively obtain a vibration-proofing effect based on the resonance action of the fluid, a low-viscosity fluid of 0.1 Pa · s or less Is preferably employed. Further, the incompressible fluid is sealed in the pressure receiving chamber 94 and the equilibrium chamber 96 by, for example, fixing the fixing bracket 32 for the integrally vulcanized molded product of the main rubber elastic body 16 including the first and second mounting brackets 12 and 14. This is realized by assembling the integral vulcanized molded product of the diaphragm 30 and the partition member 40 in an incompressible fluid.

  In addition, the first partition fitting 42 and the fixing fitting 32 of the partition member 40 are opposed to each other with a predetermined distance in the radial direction, and the inner flange-like portion 34 of the fixing fitting 32 and the second partition fitting of the partition member 40 The outer peripheral portion of 44 is opposed to each other at a predetermined distance in the axial direction, and the annular space partitioned by the partition member 40 and the fixing bracket 32 is fluid-tight using the elastic deformation action of the seal rubber layer 38. Is blocked. Further, the partition wall portion 62 projecting from the first partition fitting 42 is in close contact with the peripheral wall portion of the fixing fitting 32 and the inner flange-like portion 34 via the seal rubber layer 38, so that an annular space is formed. Some are fluid-tightly partitioned. Further, a communication hole 76 of the partition member 40 is positioned on the opposite side of the partition member 40 to the communication window 64 sandwiching the partition wall 62 in the circumferential direction. Thereby, an orifice passage 98 is formed in the mount 10 extending in the circumferential direction of the outer peripheral portion of the partition member 40 by a predetermined length in the mount 10 (a little less than one turn in the present embodiment). One end portion of the orifice passage 98 is connected to the pressure receiving chamber 94 through the communication hole 76, and the other end portion of the orifice passage 98 is connected to the equilibrium chamber 96 through the communication window 64. 94 and the equilibrium chamber 96 are communicated with each other through an orifice passage 98 so that fluid flow through the orifice passage 98 is allowed between the chambers 94 and 96.

  In addition, an effective anti-vibration effect is exhibited with respect to vibration in a low frequency range of around 20 Hz, for example, where the resonance frequency of the fluid flowing through the orifice passage 98 corresponds to idling vibration or the like based on the resonance action of the fluid. Is tuned to be. The orifice passage 98 is tuned, for example, by the rigidity of the wall springs of the pressure receiving chamber 94 and the equilibrium chamber 96, that is, the main rubber elastic body 16 and the diaphragm 30 corresponding to the amount of pressure change required to change the fluid chamber by a unit volume. It is possible to adjust the passage length and passage cross-sectional area of the orifice passage 98 while taking into account the characteristic values based on the respective elastic deformation amounts such as the above. Generally, the phase of the pressure fluctuation transmitted through the orifice passage 98 is adjusted. Can be grasped as the tuning frequency of the orifice passage 98.

  Further, the pressure of the equilibrium chamber 96 is exerted on one surface (upper in FIG. 1) of the elastic rubber plate 80 accommodated and disposed in the accommodation space 78 of the partition member 40 through the through hole 54 of the first partition fitting 42. In addition, the pressure of the pressure receiving chamber 94 is applied to the other surface of the elastic rubber plate 80 through the through hole 68 of the second partition metal fitting 44.

  Accordingly, the elastic rubber plate 80 is elastically deformed or displaced based on the relative pressure difference between the pressure receiving chamber 94 and the equilibrium chamber 96, and the pressure in the pressure receiving chamber 94 is absorbed by the deformation or displacement. . Therefore, a vibration in a frequency range higher than the tuning frequency of the orifice passage 98, for example, a vibration such as a driving noise of an automobile, is input, and the flow resistance of the orifice passage 98 is remarkably increased to be substantially clogged. Even in this case, since the pressure of the pressure receiving chamber 94 is absorbed by the displacement or deformation of the elastic rubber plate 80, the high pressure spring of the pressure receiving chamber 94 due to the closed state of the orifice passage 98 is avoided, The desired anti-vibration effect can be obtained stably.

  In particular, in this embodiment, the elastic displacement of the central disc-shaped portion 84 of the elastic rubber plate 80 is limited by the seal lip 90 being supported by the first partition fitting 42 and the second partition fitting 44. However, the portion of the central disc-shaped portion 84 excluding the restrained portions by the first and second partition fittings 42 and 44 is balanced with the pressure receiving chamber 94 through the through holes 54 and 68 of the first and second partition fittings 42 and 44. By facing the chamber 96, elastic deformation of the portion of the central disc-shaped portion 84 is allowed based on the pressure difference between the pressure receiving chamber 94 and the equilibrium chamber 96.

  Further, the intermediate thin portion 88 and the outer peripheral annular portion 86 of the elastic rubber plate 80 are balanced with the pressure receiving chamber 94 through a plurality of large holes 58 and 72 in the through holes 54 and 68 of the first and second partition fittings 42 and 44. By facing the chamber 96, elastic deformation and elastic displacement in the intermediate thin portion 88 and the outer peripheral annular portion 86 are allowed based on the pressure difference between the pressure receiving chamber 94 and the equilibrium chamber 96.

  Here, an elastic rubber valve 100 as a valve body is provided in the large hole 72 of the second partition fitting 44 on the side facing the pressure receiving chamber 94 in the through holes 54 and 68 of the partition member 40. As shown in FIG. 7, the elastic rubber valve 100 is a thin plate having a fan shape or trapezoidal shape in a plan view, and is made of a rubber elastic body. The thickness dimension of the elastic rubber valve 100 is substantially the same as the thickness dimension of the second partition fitting 44.

  In addition, a stepped portion 102 is integrally formed on the radially outer edge (outer peripheral edge) of the elastic rubber valve 100. The stepped portion 102 has a thin plate shape that protrudes to one side in the thickness direction of the elastic rubber valve 100 and extends outward from the radially outer edge of the elastic rubber valve 100.

  This stepped portion 102 is overlapped from the side of the pressure receiving chamber 94 around the outer peripheral edge portion of the large hole 72 in the second partition metal fitting 44, vulcanization adhesion, other adhesives, fixing bolts, etc. It is fixed using. Further, the outer peripheral edge portion of the elastic rubber valve 100 is overlapped with the outer peripheral edge portion of the large hole 72, and is fixed using vulcanization adhesion or other adhesive as required. Thereby, the elastic rubber valve 100 is fixed to the partition member 40.

  In particular, both end portions in the circumferential direction of the elastic rubber valve 100 are in contact with each circumferential end portion of the large hole 72 and extend along such end portions, and are not fixed. Further, a tip end portion extending inward in the radial direction of the elastic rubber valve 100 is positioned at a radial intermediate portion of the large hole 72. In short, the elastic rubber valve 100 is fixed to the outer peripheral edge portion of the large hole 72 and extends inward from the outer peripheral edge portion of the large hole 72 toward the inner peripheral edge portion. The tip of the elastic rubber valve 100 is a free end. As is clear from this, in this embodiment, the window portion of the partition member 40 includes the through hole 68 of the second partition fitting 44 having the large hole 72 and the through hole 54 of the first partition fitting 42. It consists of

  Further, the distal end portion of the elastic rubber valve 100 is disposed radially inward from the outer peripheral edge portion of the outer peripheral annular portion 86 of the elastic rubber plate 80 accommodated in the partition member 40, and Abutting protrusions 92 projecting downward from the inner peripheral edge are axially opposed to each other. In particular, in the present embodiment, the contact protrusion 92 between the elastic rubber valve 100 and the elastic rubber plate 80 is in contact with the elastic rubber valve 100 and the elastic rubber plate 80 in an initial state where the elastic rubber valve 100 and the elastic rubber plate 80 are not elastically deformed. The space between the rubber plate 80 and the elastic rubber valve 100 is closed.

  Further, a plurality of cut portions 104 are provided on the circumference of the outer circumferential surface of the outer circumferential annular portion 86 of the elastic rubber plate 80. The notch 104 has a groove shape extending in a substantially constant semicircular cross section in the thickness direction (upper and lower in FIG. 1) of the elastic rubber plate 80, and the width dimension gradually widens radially outward from the bottom. So that it is open. In particular, since the plurality of the cut portions 104 are formed at equal intervals on the circumference of the outer circumferential surface of the outer circumferential annular portion 86, the outer circumferential surface of the outer circumferential annular portion 86 has unevenness like a gear tooth. The shape is arranged alternately in the direction.

  Furthermore, protrusions 106 extending outward in the axial direction are provided at both end portions in the axial direction (upper and lower in FIG. 1) of the mountain-shaped protrusions positioned between the notches 104. . The projection 106 has a semicircular cross section in the axial direction, extends continuously in the circumferential direction across the axial end portion of each cut portion 104, and is integrally formed with the elastic rubber plate 80. . Accordingly, both end portions in the axial direction at the outer peripheral edge portion of the elastic rubber plate 80 provided with the cut portions 104 are configured to include the protrusions 106, and the axial length of the cut portions 104 is determined by the protrusions 106 and 106. It is substantially extended. Further, a downwardly extending protrusion 106 protrudes toward the elastic rubber valve 100 of the second partition member 44 and is opposed to the elastic rubber valve 100 in the axial direction.

  In particular, in the present embodiment, the outer circumferential annular portion 86 of the elastic rubber plate 80 has a corrugated shape that alternately undulates in the circumferential direction, so that the axial separation distance between the protrusion 106 and the elastic rubber valve 100 is circumferential. As a result, there is a portion where the protrusion 106 is opposed to the elastic rubber valve 100 at a predetermined distance in the axial direction in a part in the circumferential direction, and another part in the circumferential direction. There is a portion where the protrusion 106 is in contact with the elastic rubber valve 100 in the axial direction.

  In the automobile engine mount 10 having such a structure, the cut portion 104 formed on the outer peripheral surface of the elastic rubber plate 80 is positioned radially outward from the tip portion of the elastic rubber valve 100, and Since the elastic rubber valve 100 is opposed to the elastic valve 100 in the axial direction, exposure to the pressure receiving chamber 94 through the large hole 72 of the second partition metal fitting 44 is suppressed. Further, the contact protrusion 92 between the elastic rubber valve 100 and the elastic rubber plate 80 is in contact with the elastic rubber plate 80 and the elastic rubber plate 80 in an initial state where the elastic rubber valve 100 and the elastic rubber plate 80 are not elastically deformed. The space between the elastic rubber valves 100 is closed. That is, the outer peripheral edge of the elastic rubber plate 80 is covered with the elastic rubber valve 100. Accordingly, when a normal amplitude vibration is input, the hydraulic pressure in the pressure receiving chamber 94 is prevented from being released through the notch 104 between the elastic rubber valve 100 and the elastic rubber plate 80, and the pressure receiving chamber. The relative pressure difference between 94 and the equilibration chamber 96 is effectively induced. As a result, the amount of fluid flow through the orifice passage 98 is preferably ensured, and the vibration isolation effect due to the resonance action of the fluid through the orifice passage 98 can be advantageously exhibited.

  Further, when vibration in a frequency range higher than the tuning frequency of the orifice passage 98 is input, the orifice passage 98 is clogged, but the pressure of the pressure receiving chamber 94 is applied to the elastic rubber plate 80 through the through hole 68 of the partition member 40. Thus, the central disc-shaped portion 84 of the elastic rubber plate 80 is elastically deformed, or the outer peripheral annular portion 86 and the intermediate thin portion 88 of the elastic rubber plate 80 are deformed or displaced, whereby the pressure in the pressure receiving chamber 94 is increased. Is absorbed. As a result, the high pressure spring of the pressure receiving chamber 94 is avoided, and the vibration isolation effect can be advantageously exhibited.

  By the way, when a large amplitude vibration is input, for example, when the automobile travels on a wavy road or a speed breaker, the main rubber elastic body 16 is greatly elastically deformed, and the main rubber elastic body 16 is elastically deformed. Due to the phase difference between the pressure fluctuation exerted on the pressure receiving chamber 94 and the pressure fluctuation exerted on the pressure receiving chamber 94 due to the resonance effect of the fluid flowing through the orifice passage 98, a large negative pressure is locally generated in the pressure receiving chamber 94. May be born.

  Therefore, in the engine mount 10 of this structure, as shown in FIG. 8, the intermediate thin portion 88 and the outer peripheral annular portion 86 of the elastic rubber plate 80 are positive when the pressure receiving chamber 94 is in a greatly reduced pressure state. Or the outer peripheral annular portion 86 is deformed so as to fall toward the pressure receiving chamber 94 from the inner peripheral edge portion toward the outer peripheral edge portion, and the outer peripheral edge portion is formed outside the elastic rubber valve 100. It abuts on the upper end near the periphery. When the elastic deformation of the outer peripheral annular portion 86 further proceeds, the outer peripheral edge portion of the outer peripheral annular portion 86 is further displaced toward the pressure receiving chamber 94 side, and the elastic rubber that is in contact with the outer peripheral edge portion in accordance with the displacement. The valve 100 is elastically deformed so as to push open toward the pressure receiving chamber 94 side.

  In particular, in this embodiment, when the outer peripheral edge of the elastic rubber plate 80 is elastically deformed, the protrusion 106 protruding toward the elastic rubber valve 100 at the outer peripheral edge positively contacts the elastic rubber valve 100. Thus, the amount of deformation so as to push open toward the pressure receiving chamber 94 side of the elastic rubber valve 100 is increased.

  As a result, the opening passage 108 connecting the large hole 72 of the second partition member 44 and the large hole 58 of the first partition member 42 is formed between the wall portion constituting the housing space 78 of the partition member 40 and the elastic rubber plate 80. It develops through the notch 104. When the large amplitude vibration in question is input, the pressure receiving chamber 94 and the equilibrium chamber 96 are short-circuited through the opening passage 108, so that the hydraulic pressure in the pressure receiving chamber 94 is released to the equilibrium chamber 96 side, and the pressure receiving chamber 94 is excessively large. Negative pressure state is eliminated. As a result, the generation of cavitation bubbles due to the large pressure-reducing state of the pressure receiving chamber 94 is suppressed, and shocking and large abnormal noise accompanying the generation and disappearance of bubbles is prevented.

  In particular, in this embodiment, since the cut portion 104 of the elastic rubber plate 80 is provided over the entire circumference, the assembly to the partition member 40 can be easily performed without special consideration of the directionality. In addition, it is possible to advantageously cope with negative pressure generated locally in the pressure receiving chamber 94.

  Further, since the opening passage 108 appears on the outer peripheral edge side of the elastic rubber plate 80, the circumferential length of the opening passage 108 is sufficiently long. As a result, fluid pressure escapes efficiently through the opening passage 108, and the excessive negative pressure state of the pressure receiving chamber 94 is advantageously eliminated.

  Further, since the intermediate thin portion 88 is formed between the outer annular portion 86 and the central disc-shaped portion 84 of the elastic rubber plate 80, the outer peripheral portion of the elastic rubber plate 80 can be more easily deformed, and the elastic rubber. The hydraulic pressure absorbing action due to the deformation of the plate 80 and the operability of the elastic rubber valve 100 due to the deformation of the outer peripheral annular portion 86 can be improved.

  Furthermore, in the present embodiment, the elastic rubber valve 100 is fixed to the outer peripheral edge portion of the large hole 72 of the second partition member 44 and extends from the outer peripheral edge portion into the large hole 72. The distal end portion of the elastic rubber valve 100 extending into the window portion is a free end. Thereby, even if the deformation amount of the outer peripheral annular portion 86 of the elastic rubber plate 80 is relatively small, the elastic rubber valve 100 can be easily pushed open.

  In particular, the outer peripheral edge of the elastic rubber plate 80 and the tip of the elastic rubber valve 100 overlap each other in the radial direction and extend in different directions, and are widely spaced apart in the radial direction. Further, the contact protrusion 92 protruding from the outer peripheral annular portion 86 of the elastic rubber plate 80 is in contact with the tip of the elastic rubber valve 100, so that the space between the elastic rubber plate 80 and the elastic rubber valve 100 is between. It is blocked. As a result, when an amplitude vibration of a normal size is input, the hydraulic pressure escapes from between the inner peripheral edge of the large hole 72 and the tip of the elastic rubber valve 100 through the notch 104 on the outer peripheral surface of the elastic rubber plate 80. It can be suppressed.

  Therefore, when the amplitude vibration of the normal size is input, the fluid tightness between the elastic rubber plate 80 and the through holes 54 and 68 is ensured, and the desired vibration isolation effect can be stably obtained. When the large amplitude vibration in question is input, the opening passage 108 is effectively developed, and the abnormal noise due to the generation of cavitation bubbles is effectively suppressed.

  Further, in the present embodiment, the central disc-shaped portion 84 of the elastic rubber plate 80 is sandwiched between the first partition fitting 42 and the second partition fitting 44 using the seal lip 90 to limit the displacement. Further, the outer peripheral annular portion 86 of the elastic rubber plate 80 comes into contact with the partition member 40 via the contact protrusions 92 and the protrusions 106 that protrude vertically. Furthermore, the contact area to the partition member 40 is made small by the corrugated plate shape in which the outer peripheral annular portion 86 undulates in the circumferential direction. As a result, the abnormal noise accompanying the contact of the elastic rubber plate 80 with the partition member 40 is effectively reduced.

  As mentioned above, although one embodiment of the present invention has been described in detail, this is merely an example, and the present invention is not limited to any specific description by this embodiment, and is based on the knowledge of those skilled in the art. The present invention can be implemented in a mode with various changes, corrections, improvements, and the like. Further, it goes without saying that such embodiments are all included in the scope of the present invention without departing from the gist of the present invention.

  For example, the shape, size, structure, number, arrangement, etc. of the elastic rubber plate 80, the elastic rubber valve 100, the cut portion 104, and the opening passage 108 are suitable for the desired vibration-proofing effect, noise countermeasures, manufacturability, etc. The setting is changed accordingly, and is not limited to the example.

  Specifically, in the above-described embodiment, the elastic rubber valve 100 is fixed to the outer peripheral edge of the large hole 72. However, the elastic rubber valve 100 can be fixed to the inner peripheral edge of the large hole or both ends in the circumferential direction. It is. The tip of the elastic rubber valve may be in contact with the edge of the large hole.

  In the above embodiment, the seal lip 90 formed on the central disc-shaped portion 84 of the elastic rubber plate 80 is disposed between the first partition fitting 42 and the second partition fitting 44, so that the central disc is arranged. Although the shape portion 84 is restrained by the partition member 40, it is also possible to allow displacement of the central disk shape portion without providing the seal lip 90.

  Further, for example, when the elastic rubber plate is thin as a whole and the deformation amount of the outer peripheral edge of the elastic rubber plate is sufficiently secured, the intermediate thin portion 88 of the elastic rubber plate 80 is not necessarily provided. .

  In the above embodiment, the contact protrusion 92 is provided on the elastic rubber plate 80 and protrudes toward the elastic rubber valve 100. However, the contact protrusion 92 is provided on the elastic rubber valve and protrudes toward the elastic rubber plate. May be.

  Moreover, in the said embodiment, although the outer periphery annular part 86 of the elastic rubber plate 80 was made into the corrugated plate shape which undulates up and down in the circumferential direction, and it was made into the shape where a thickness dimension becomes small gradually toward an outer peripheral side. For example, the thickness dimension may be simply reduced toward the outer peripheral side, or the thickness dimension may be constant throughout.

  In the above-described embodiment, the contact protrusions 92 and the protrusions 106 are provided on the elastic rubber plate 80. However, these are the striking accompanying the contact of the elastic rubber plate 80 with the partition member 40 and the elastic rubber valve 100. It is provided according to various required characteristics such as sound reduction, fluid tightness between the elastic rubber plate 80 and the elastic rubber valve 100, operability of the elastic rubber valve 100 by the elastic rubber plate 80, and manufacturability. Not a mandatory configuration requirement.

  Further, the shape, size, structure, number, arrangement, and the like of the partition member 40 and the orifice passage 98 are not limited to those illustrated, and for example, a plurality of orifice passages tuned to different frequency ranges may be formed. Is possible.

  Further, the present invention provides a shaft as a first mounting member that is employed as an engine mount, a suspension bush or the like for an FF type automobile as described in, for example, Japanese Patent Laid-Open No. 2-243030. A large-diameter cylindrical outer cylinder member as a second mounting member is spaced apart outwardly in the direction perpendicular to the axis of the member, and the main rubber elastic body is interposed between the axially perpendicular surfaces of the shaft member and the outer cylinder member. It is also applicable to a cylindrical vibration isolator in which a shaft member and an outer cylinder member are connected by a main rubber elastic body.

It is a longitudinal cross-sectional view of the engine mount for motor vehicles as one Embodiment of this invention, Comprising: The figure corresponded in the II cross section of FIG. The bottom view of the partition member which comprises a part of engine mount for the vehicles. The bottom view of the 1st partition metal fitting which comprises a part of the partition member. The top view of the 1st partition metal fitting. The bottom view of the 2nd partition metal fitting which comprises a part of the partition member. The top view of the movable plate assembled | attached to the partition member. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for the said motor vehicles. The longitudinal cross-sectional view which expands the principal part of the engine mount for the said motor vehicles, and shows one operation form different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Engine mount for motor vehicles, 12 ... 1st mounting bracket, 14 ... 2nd mounting bracket, 16 ... Main body rubber elastic body, 30 ... Diaphragm, 40 ... Partition member, 54 ... Through-hole, 68 ... Through-hole, 78 ... accommodating space, 80 ... elastic rubber plate, 94 ... pressure receiving chamber, 96 ... equilibrium chamber, 98 ... orifice passage, 100 ... elastic rubber valve, 104 ... notch, 108 ... opening passage

Claims (5)

The first attachment member attached to one member to be vibration-proof connected and the second attachment member attached to the other member to be vibration-proof connected are separated from each other and connected by the main rubber elastic body. The partition member is fixedly supported by the second mounting member, and a pressure receiving chamber in which a part of the wall part is composed of the main rubber elastic body and a part of the wall part are flexible on both sides of the partition member. An equilibrium chamber composed of a membrane is formed, an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, an orifice passage is formed to communicate the pressure receiving chamber and the equilibrium chamber with each other, and the partition member A fluid-filled type anti-static system in which a movable plate is accommodated and disposed in the provided accommodation space, and the pressure in the pressure receiving chamber and the equilibrium chamber is exerted on both sides of the movable plate, and a hydraulic pressure absorbing function is exhibited based on the displacement of the movable plate. In the vibration device,
A window portion is formed in the wall portion of the housing space in the partition member, and pressure of the pressure receiving chamber and the equilibrium chamber is exerted on each surface of the movable plate through the window portion, In the window portion, a valve body made of an elastic body is disposed at a portion facing the outer peripheral edge portion of the movable plate and fixed to the partition member, while at least the movable plate is positioned facing the valve body. The outer peripheral edge portion is formed of an elastic body, and a cut portion is formed on the outer peripheral surface of the movable plate. When a large amplitude vibration is input, the outer peripheral edge portion of the movable plate is elastically deformed and contacts the valve body. A fluid-filled vibration damping device, wherein the valve body is pushed open by contact, and an opening passage is formed between the movable plate and the cut portion.   The valve body is fixed to the outer peripheral edge portion of the window portion of the partition member and is arranged to extend from the outer peripheral edge portion of the window portion into the window portion, and the valve body extended into the window portion. The fluid-filled type vibration damping device according to claim 1, wherein the tip portion is a free end.   The fluid-filled type prevention according to claim 2, wherein a contact protrusion that protrudes from at least one to the other is formed at a portion of the valve body that faces the free end and the movable plate. Shaker.   The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the cut portions are formed at equal intervals on the circumference of the outer peripheral surface of the movable plate. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein a protrusion protruding toward the valve body is provided on an outer peripheral edge portion of the movable plate.

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