JP2008163970A - Fluid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-sealed vibration control device having a new structure, which stably provides a desired vibration isolation effect by suppressing highly dynamic spring motion caused by a closed state of an orifice passage, advantageously facilitates manufacturing, and reduces cost by protecting a flexible rubber film without increasing the number of components. <P>SOLUTION: A sleeve member 18 is formed into a tubular shape having a groove-shaped cross section opened on the other side in the axial direction and extending in the circumferential direction; a pressure reception chamber 66 and an equilibrium chamber 68 are formed inside its inside wall 26 and in a groove part 50 of the sleeve member 18, respectively; a movable rubber film 48 formed integrally with a body rubber elastic body 16 is arranged on the inside wall 26 of the sleeve member 18 to absorb pressure of the pressure reception chamber 66 based on elastic deformation of the movable rubber film 48; and the flexible rubber film 46 is covered with a tubular stopper member 60 in a stopper mechanism in a rebound direction of a first mounting member 12 and a second mounting member 14. <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 an incompressible fluid enclosed therein, and in particular, is balanced with a pressure receiving chamber filled with the incompressible fluid. The present invention relates to a fluid-filled vibration isolator in which chambers communicate with each other through an orifice passage.

  Conventionally, as a kind of anti-vibration coupling body and anti-vibration support body interposed between members constituting the vibration transmission system, anti-vibration is based on the flow action such as resonance action of incompressible fluid enclosed inside. 2. Description of the Related Art A fluid-filled vibration isolator that is effective is known. In this fluid-filled vibration isolator, the first mounting member and the cylindrical second mounting member are connected by the main rubber elastic body on the one opening side in the axial direction of the second mounting member, A flexible membrane is disposed on the other opening side in the axial direction of the second mounting member, and a fluid chamber is provided in which an incompressible fluid is sealed between the main rubber elastic body and the flexible membrane. . In addition, the fluid chamber is partitioned by the partition member supported by the second mounting member, and the pressure receiving chamber and the wall portion in which part of the wall portion is formed of a main rubber elastic body on both sides of the partition member in the fluid chamber An equilibration chamber partially formed of a flexible membrane is formed, and the pressure receiving chamber and the equilibration chamber communicate with each other through an orifice passage formed in the partition member. According to such a structure, a relative pressure fluctuation difference is generated between the pressure receiving chamber and the equilibrium chamber in accordance with the vibration input, and the amount of fluid flowing through the orifice passage is ensured. An anti-vibration effect can be obtained based on a fluid action such as an action. For example, what is shown in FIG. 8 of Patent Document 1 (Japanese Patent Laid-Open No. 06-174005) is that, and application to an engine mount, a body mount, a differential mount for automobiles, and other suspension member mounts is examined. Has been.

  By the way, in the above-described conventional fluid-filled vibration isolator, the partition member and the flexible film are formed separately from the vulcanized molded product of the main rubber elastic body provided with the first and second mounting members, respectively. And fixedly assembled to the second mounting member of the vulcanized molded product. Specifically, for example, based on the fact that a fixing member is provided on the outer peripheral portion of the flexible membrane and the fixing member is fixed to the second attachment member of the vulcanized product, the flexible membrane is attached to the second attachment member. It is arranged on the member. Further, when assembling the partition member to the second mounting member, the partition member and the flexible film fixing member are sequentially fitted from the other axial opening of the second mounting member so that the partition member is the main body. A partition member based on providing a locking structure so as to be positioned at a predetermined position between the rubber elastic body and the flexible film in the axial direction or reducing the diameter of the second mounting member as necessary. A special structure is employed, such as tightening and fixing the second mounting member in the direction perpendicular to the axis. For this reason, there has been a problem that it is difficult to avoid complication of manufacturing and cost increase with an increase in the number of parts and manufacturing processes.

  Therefore, Patent Document 1 discloses a fluid-filled vibration isolator as one measure for dealing with the above-described problem (see FIG. 1 of Patent Document 1). In such a fluid-filled vibration isolator, a sleeve member (connecting material) extending in the circumferential direction with a substantially inverted U-shaped cross section is fixed to the end of the main rubber elastic body opposite to the side to which the first mounting member is fixed. The window portion formed on the outer peripheral wall portion of the sleeve member is covered with a flexible film, and the second mounting member is caulked and fixed to the lower end portion of the sleeve member so that the opening portion of the sleeve member is By being fluid-tightly closed, a pressure receiving chamber is formed inside the inner peripheral wall portion of the sleeve member, and an equilibrium chamber is formed between the inner peripheral wall and the outer peripheral wall of the sleeve member. In addition, an orifice passage (opening) that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other is provided through the inner peripheral wall. In such an anti-vibration device, a fixing member is provided on the outer peripheral portion of the flexible membrane as seen in the fluid-filled anti-vibration device having the conventional structure described above, and the second attachment member of the vulcanized product is provided. Since it is not necessary to fix separately to each other or to position and arrange the partition member between the main rubber elastic body and the flexible film in the axial direction, an increase in the number of parts and complication of assembly can be suppressed. In addition, since the pressure receiving chamber and the equilibrium chamber are provided in parallel in the direction perpendicular to the axis, the support load is input in the axial direction, especially based on the low center of gravity by suppressing the axial dimension of the vibration isolator. The stability of the wearing state under the wearing state is improved.

  However, in the fluid-filled vibration isolator shown in FIG. 1 of Patent Document 1, since the flexible film is exposed to the outside from the window portion of the second mounting member, for example, the physical properties of the flexible film In some cases, the durability of the flexible film becomes a problem because a gas, liquid, or any small piece that directly affects the film directly contacts the flexible film.

  In order to cope with such a problem, in FIG. 4 and FIG. 6 of Patent Document 1, for the purpose of protecting the flexible film, the flexible film is covered so as to cover the whole from the outside. Although a structure provided with a cover has been proposed, if such a protective cover is specially provided, the number of parts increases, which may cause a reduction in manufacturing efficiency and an increase in cost. In addition, since the dimension in the direction perpendicular to the axis is increased by the amount of the protective cover, there is a problem that it is difficult to reduce the mounting space.

  Further, in the fluid-filled vibration isolator of the conventional structure including the structure described in Patent Document 1, the vibration isolating effect exerted by the resonance action of the fluid through the orifice passage is relatively large when the orifice passage is tuned in advance. Since it is limited to a narrow frequency range, there is a problem that it is difficult to meet the required advanced vibration isolation characteristics. Specifically, for example, when a vibration in a frequency range higher than the tuning frequency of the orifice passage is input, the flow resistance of the fluid in the orifice passage is remarkably increased due to the antiresonant action of the fluid flowing through the orifice passage. Since the passage is substantially closed and high dynamic springs are caused due to this, it is difficult to stably obtain the intended vibration-proofing effect.

Japanese Patent Laid-Open No. 06-174005

  Here, the present invention has been made in the background as described above, and the problem to be solved is due to the blockage state of the passage at the time of vibration input in a frequency range higher than the tuning frequency of the orifice passage. In addition to preventing the high dynamic springs from becoming stable, the desired anti-vibration effect can be stably obtained, and the flexible rubber film can be protected without increasing the number of parts, thereby facilitating manufacturing. Another object of the present invention is to provide a fluid-filled vibration isolator having a novel structure that can be advantageously reduced in cost.

  Hereinafter, the aspect of this invention made in order to solve the above-mentioned 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 mounting member is spaced apart on the one axial side of the sleeve member, and the first mounting member and the sleeve member are connected by the main rubber elastic body. In addition, the second mounting member is fixed to the other opening side of the sleeve member in the axial direction, and the other opening portion in the axial direction is fluid-tightly covered, and a part of the wall portion is made of a rubber elastic body. The chamber and a part of the wall form an equilibrium chamber composed of a flexible rubber film, and incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber communicate with each other. In the fluid-filled vibration isolator in which the orifice passage is formed, the sleeve member is formed in a cylindrical shape extending in the circumferential direction with a groove-shaped cross section that opens in the other axial direction, and the opening of the groove portion between the inner peripheral wall and the outer peripheral wall of the sleeve member The part is fluid-tightly covered with the second mounting member A flexible rubber film in which a pressure receiving chamber is formed inside the inner peripheral wall of the sleeve member, an opening window is formed in a part of the outer peripheral wall of the sleeve member, and the opening window is integrally formed with the main rubber elastic body. In addition, an equilibrium chamber is formed in the groove portion of the sleeve member, and an orifice passage is formed so as to extend in the circumferential direction in the groove portion. Further, the sleeve member is opposed to the flexible rubber film in the direction perpendicular to the axis. A movable rubber film integrally formed with the main rubber elastic body is provided on the positioned inner peripheral wall, the pressure of the pressure receiving chamber is exerted on one surface of the movable rubber film, and the other surface of the movable rubber film is balanced. The pressure fluctuation absorbing mechanism is configured so that the pressure of the chamber is exerted. Further, the first mounting member is provided with a first abutting portion that extends in a direction perpendicular to the axis, and the second mounting member A cylindrical stopper on the outer periphery The material is fixed and extends outside the first abutting portion in the axial direction, and the tip end portion of the stopper member bends to the inner peripheral side and is spaced apart from the first abutting portion in the axial direction so as to face the first abutting portion. And a stopper mechanism in the rebound direction is formed by providing a buffer rubber on at least one of the first contact portion and the second contact portion. The flexible rubber film is covered with a stopper member.

  In such a fluid-filled vibration isolator having a structure according to the present invention, when the vibration is input in a frequency range higher than the tuning frequency of the orifice passage, the orifice passage is caused by the antiresonant action of the fluid flowing through the orifice passage. However, the pressure in the pressure receiving chamber is absorbed by the elastic deformation of the movable rubber film provided on the inner peripheral wall of the sleeve member that partitions the pressure receiving chamber and the equilibrium chamber. As a result, the high dynamic spring caused by the closed state of the orifice passage is suppressed, and the intended vibration isolation effect can be advantageously exhibited.

  In addition, in this structure, in addition to the movable rubber film that forms part of the pressure fluctuation absorbing mechanism described above, a flexible rubber film that forms part of the wall portion of the equilibrium chamber is integrally formed with the main rubber elastic body. Has been. As a result, the flexible rubber film and the movable rubber film can be directly provided on the vulcanized molded product without increasing the number of new parts and manufacturing processes for fixing to the vulcanized molded product of the main rubber elastic body. Therefore, improvement in manufacturing efficiency and cost reduction can be advantageously achieved.

  Furthermore, the fluid-filled vibration isolator of this structure is provided with a stopper mechanism in the rebound direction, so that at least one of the first mounting member and the second mounting member is separated from each other in the axial direction ( When the first abutting portion and the second abutting portion abut each other via the buffer rubber layer when displaced in the so-called rebound direction), the first mounting member and the second mounting member in the rebound direction The relative displacement is limited in a buffering manner. Thereby, the stress of the main rubber elastic body connecting the first mounting member and the second mounting member is reduced, and the durability can be improved. In addition, since cavitation bubbles, which may occur under excessive negative pressure in the pressure receiving chamber due to excessive deformation of the main rubber elastic body in the rebound direction, are suppressed, shock vibrations and abnormalities caused by the bursting of the bubbles can be suppressed. The generation of sound is advantageously suppressed.

  Therefore, the flexible rubber film is covered with a cylindrical stopper member that constitutes a part of the stopper mechanism in the rebound direction, thereby preventing interference of foreign matter and other members with the flexible rubber film. Thus, damage to the flexible rubber membrane is avoided. This eliminates the need for specially providing a member for protecting the flexible rubber film as shown in FIGS. 4 and 6 of Patent Document 1 (Japanese Patent Laid-Open No. 06-174005). Therefore, the increase in the number of parts and the manufacturing process can be suppressed, and the manufacturing efficiency can be improved and the cost can be advantageously reduced. In addition, another member is provided outside the flexible rubber film. Since the increase in the outer dimension due to the suppression is suppressed, the downsizing of the device can be advantageously achieved in combination with the avoidance of the increase in the size of the stopper member disposed outside the flexible rubber film. is there.

  Therefore, in the fluid-filled vibration isolator according to the present invention, the vibration isolator having multiple functions such as a hydraulic pressure absorbing function, a stopper function, and a flexible rubber film protective function is relatively inexpensive and There is a great technical effect in that it can be realized compactly.

  In the fluid-filled vibration isolator according to the present invention, the outer flange-shaped portion is integrally formed at the opening end of the outer peripheral wall of the sleeve member, and the outer flange-shaped portion and the outer peripheral portion of the second mounting member are pivoted. Are overlapped with each other in the direction, and a ring-shaped caulking portion is integrally formed at the other axial end of the stopper member, and the outer flange portion and the outer peripheral portion of the second mounting member are fitted into the caulking portion. Thus, a structure in which the second mounting member, the sleeve member, and the stopper member are fixed to each other by caulking the caulking portion can be suitably employed. According to such a structure, since the fixing structure is simplified and an increase in the number of parts accompanying the fixing is suppressed, it is possible to further improve manufacturing efficiency and low cost.

  In the fluid-filled vibration isolator according to the present invention, the lid member is disposed on the opposite side of the first contact portion across the second contact portion of the stopper member of the first mounting member. The outer peripheral portion of the lid member extends outward in the direction perpendicular to the axis from the inner peripheral edge portion of the second contact portion, so that the inner peripheral edge portion of the second contact portion is entirely covered with the lid member. Such a structure can be preferably adopted. According to such a structure, foreign matter can be prevented from entering from the inner peripheral edge portion of the second abutting portion located on the outer side in the axial direction of the flexible rubber film to the flexible rubber film. The membrane can be protected more advantageously.

  Further, in the fluid filled type vibration damping device according to the present invention, it is applied to an automobile engine mount, and the orifice passage is tuned so as to exhibit a damping effect in a low frequency range corresponding to an engine shake inputted during traveling. In addition, at the time of vibration input in the middle frequency range corresponding to idling vibration when stopping and low-speed booming noise when traveling, the pressure of the pressure-receiving chamber is absorbed so that the pressure of the pressure-receiving chamber is absorbed based on elastic deformation of the movable rubber film. A structure in which the frequency is tuned may be employed. According to such a structure, various vibrations such as engine shake, idling vibration or low-speed booming noise, which are problems in automobiles, are advantageously reduced, and the stopper function and the flexible rubber film as described above are used. Since the structure having the shield function is realized at low cost, it can be advantageously employed as an automobile engine mount.

  In the fluid filled type vibration damping device according to the present invention, a pair of straight portions are provided in one direction perpendicular to the axis across the first mounting member of the main rubber elastic body, and the pair of straight portions are opposed to each other. A structure in which an engine mount for an automobile is configured by being mounted on an automobile so that one direction perpendicular to the axis is the vehicle longitudinal direction and the direction perpendicular to the axis perpendicular direction is the vehicle lateral direction is adopted. Also good. According to such a structure, the spring ratio of the vehicle front-rear direction and the vehicle left-right direction in the automobile engine mount can be increased, and the riding comfort and steering stability of the vehicle can be advantageously improved.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIGS. 1 and 2 show an automobile engine mount 10 as an embodiment according to a fluid filled type vibration damping device of the present invention. In the engine mount 10 for automobiles, the first mounting bracket 12 as the first mounting member and the second mounting bracket 14 as the second mounting member are elasticized to the main body via the sleeve mounting 18 as the sleeve member. The structure connected with the body 16 is exhibited. The first mounting bracket 12 is mounted on the power unit side, and the second mounting bracket 14 is mounted on the vehicle body side, so that the power unit is supported in a vibration-proof manner with respect to the body.

  1 shows the state of the engine mount 10 as a single unit before being mounted on the automobile, but in the present embodiment, in the mounted state, the shared support load of the power unit is in the mount axis direction (in FIG. 1, (Up and down). Therefore, in the mounted state, the first mounting member 12 and the second mounting member 14 are displaced in the axial direction toward each other based on the elastic deformation of the main rubber elastic body 16. In addition, under such a mounted state, main vibrations to be vibrated are input substantially in the mount axis direction. In the following description, unless otherwise specified, the vertical direction refers to the vertical direction in FIG.

  More specifically, the first mounting member 12 has a small-diameter substantially cylindrical shape or a truncated cone shape, and a screw hole 20 that opens to the upper end surface is provided in the center portion thereof. A fixing bolt 22 is screwed into the screw hole 20. Further, an outer flange-shaped first abutting portion 24 that extends substantially flat in the direction perpendicular to the axis is integrally formed at an axially intermediate portion of the first mounting member 12. A sleeve fitting 18 is provided below the first attachment fitting 12 at a predetermined distance. In other words, the first mounting bracket 12 is disposed separately on the opening side of the sleeve fitting 18 in one axial direction (upper in FIG. 1).

  As shown in FIGS. 3 and 4, the sleeve fitting 18 has a large-diameter cylindrical shape that continuously extends over the entire circumference in the circumferential direction with a generally inverted U-shaped cross section that opens downward as a whole. A cylindrical outer peripheral wall 28 having a large diameter is provided at a predetermined distance radially outward of the cylindrical inner peripheral wall 26 having a small diameter, and both upper end portions of the inner peripheral wall 26 and the outer peripheral wall 28 are It is set as the structure mutually connected through the connection part 30 of the substantially circular arc-shaped cross section which protrudes upwards. Thereby, inside the sleeve metal fitting 18, the space defined by the inner peripheral wall 26, the outer peripheral wall 28, and the connecting portion 30 continuously extends in a substantially constant cross section that opens downward over the entire circumference in the circumferential direction. A groove 32 is provided.

  At the lower end portion of the outer peripheral wall 28 of the sleeve fitting 18, a flange-like portion 34 is integrally provided as an outer flange-like portion that extends substantially flat in the direction perpendicular to the axis.

  An opening window 36 is provided at one place on the circumference of the sleeve metal fitting 18. The opening window 36 has a substantially rectangular shape as viewed in the direction perpendicular to the axis, penetrates the outer peripheral wall 28 of the sleeve fitting 18 in the thickness direction (left and right in FIGS. 1 and 3), and has a predetermined length ( In this embodiment, the outer peripheral wall 28 extends in the range of ¼ to ３ circumference). The upper edge portion of the opening window 36 is notched in the outer peripheral edge portion of the connecting portion 30 formed integrally with the upper end portion of the outer peripheral wall 28, and is positioned at the radial intermediate portion of the connecting portion 30. The lower edge portion of 36 is notched in the inner peripheral edge portion of the flange-shaped portion 34 formed integrally with the lower end portion of the outer peripheral wall 28, and is positioned at the radial intermediate portion of the flange-shaped portion 34.

  Further, a through hole 38 is provided in a portion of the inner peripheral wall 26 that is opposed to the opening window 36 in the direction perpendicular to the axis across the groove 32. The through hole 38 has a substantially rectangular shape when viewed in the direction perpendicular to the axis, penetrates the inner peripheral wall 26 of the sleeve fitting 18 in the thickness direction, and has a predetermined length in the circumferential direction (in this embodiment, one of the inner peripheral walls 26). (Length of / 8 to 1/4 circumference). The upper edge portion of the through hole 38 is positioned at an intermediate portion in the axial direction of the inner peripheral wall 26, and the lower edge portion of the through hole 38 is positioned near the lower end portion of the inner peripheral wall 26. Thereby, the size of the through hole 38 is made smaller than the size of the opening window 36.

  In addition, a communication hole 40 is provided at one place on the circumference of the inner peripheral wall 26 so as to cut out the lower end portion.

  The first mounting bracket 12 is spaced apart from the opening (on the top in FIG. 1) where the connecting portion 30 of the sleeve fitting 18 is formed, and the central axes of both the fittings 12 and 18 are substantially the same. It is positioned on the line. A main rubber elastic body 16 is disposed between the first mounting member 12 and the sleeve member 18.

  The main rubber elastic body 16 has a substantially truncated cone shape, and a mortar-shaped large-diameter recess 42 that opens downward is provided on the large-diameter side end face. Vulcanization adhesion with the first contact portion 24 of the first mounting bracket 12 and substantially the entire portion from the first contact portion 24 to the lower end in the axial direction being embedded in the end surface on the small diameter side of the main rubber elastic body 16. Has been. Further, the outer peripheral surface of the inner peripheral wall 26 of the sleeve metal fitting 18 and the outer peripheral surface of the connecting portion 30 are vulcanized and bonded to the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16 over substantially the entire surface. In short, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 44 including the first mounting member 12 and the sleeve member 18 as shown in FIGS. As a result, the first mounting member 12 and the sleeve member 18 are elastically connected to each other by the main rubber elastic body 16, and the opening on one side (upper in FIG. 1) of the sleeve member 18 in the axial direction. The main rubber elastic body 16 is closed fluid-tightly. In particular, in this embodiment, a part of the main rubber elastic body 16 is also filled in the groove 32 of the sleeve fitting 18. Note that the space in which the opening window 36 and the through hole 38 are opposed to each other in the direction perpendicular to the axis in the groove 32 is not filled with the main rubber elastic body 16 and is hollow.

  Here, the opening window 36 of the sleeve fitting 18 is provided with a diaphragm 46 as a flexible rubber film. The diaphragm 46 is formed of a thin rubber film integrally formed with the main rubber elastic body 16 so as to cover the opening window 36 from the outside of the sleeve fitting 18, that is, to bulge and deform outward from the sleeve fitting 18. Thus, the outer peripheral portion of the diaphragm 46 is vulcanized and bonded to the edge of the opening window 36. In particular, as shown in FIGS. 1 and 2, in the initial state where the diaphragm 46 is not deformed, the outer peripheral wall portion thereof is radially inward from the outer peripheral edge portion of the flange-shaped portion 34 of the sleeve fitting 18. The upper wall portion of the sleeve fitting 18 is located below the upper end portion of the connecting portion 30 and bulges outward in the radial direction and the axial direction from the outer peripheral wall 28 of the sleeve fitting 18 as a whole. It is made into a shape. Accordingly, the opening window 36 is covered with a diaphragm 46 in a fluid-tight manner.

  Further, an elastic rubber film 48 as a movable rubber film is provided in the through hole 38 of the sleeve fitting 18. The elastic rubber film 48 is formed integrally with the main rubber elastic body 16 and has a substantially arc plate shape along the shape of the frame of the through hole 38, and the outer peripheral edge of the elastic rubber film 48 has a through hole. By being vulcanized and bonded to the entire edge of 38, the through hole 38 is covered with a fluid-tight cover. In particular, in this embodiment, in addition to the thickness dimension of the elastic rubber film 48 being larger than the thickness dimension of the diaphragm 46, the elastic rubber film 48 is larger than the opening window 36 to which the diaphragm 46 is fixed. It is made smaller than the diaphragm 46 by being fixed so that it may fit in the frame of the small through-hole 38. Thereby, the spring rigidity of the elastic rubber film 48 is sufficiently larger than the spring rigidity of the diaphragm 46.

  A circumferential groove 50 is formed in the main rubber elastic body 16 filled in the groove portion 32 of the sleeve fitting 18. The circumferential groove 50 is a substantially constant concave cross section that extends downward from an axially intermediate portion of the filled main rubber elastic body 16 and opens at the lower end surface of the main rubber elastic body 16 and has a predetermined length ( In this embodiment, the groove portion 32 extends in the range of 2/3 round to slightly less than one round), and one circumferential end of the circumferential groove 50 (a circumferential clockwise end located at the bottom in FIG. 6). Is connected to the communication hole 40, and the other end in the circumferential direction of the circumferential groove 50 is connected to a space between the diaphragm 46 and the elastic rubber film 48. In addition, the circumferential groove 50 is formed in the middle portion of the groove portion 32 in the width direction, and the width dimension of the circumferential groove 50 is smaller than the width dimension of the groove portion 32, so that the main rubber elastic body 16 is filled. The outer circumferential surface of the inner circumferential wall 26 opposed in the direction perpendicular to the axis across the circumferential groove 50 with the circumferential groove 50 formed in the groove 32 and the main rubber elastic body 16 removed. A thin rubber layer formed integrally with the main rubber elastic body 16 is attached to the inner peripheral surface of the outer peripheral wall 28.

  Further, a thin seal rubber layer 52 integrally formed with the main rubber elastic body 16 is formed on the inner peripheral wall 26 and the outer peripheral wall 28 of the sleeve metal fitting 18 and the lower end portion of the edge of the opening window 36 so as to be adhered almost entirely. Has been. Furthermore, a pair of straight portions 54 are formed at two locations on the circumference of the large-diameter recess 42 of the main rubber elastic body 16 so as to open to the bottom surface of the recess 42 and extend in a predetermined length in the axial direction. The pair of straight portions 54 and 54 are opposed to each other in one direction perpendicular to the axis (up and down in FIG. 6). That is, the static spring constant in one direction perpendicular to the axis provided with the pair of straight portions 54, 54 is made smaller than the static spring constant in the direction perpendicular to the direction perpendicular to the axis. Furthermore, a buffer rubber layer 56 as a buffer rubber integrally formed with the main rubber elastic body 16 is attached to the upper surface of the first contact portion 24 of the first mounting member 12.

  With respect to the integrally vulcanized molded product 44 of the main rubber elastic body 16 having the first mounting bracket 12 and the sleeve bracket 18, the second mounting bracket 14 is arranged so as to be overlapped from the lower side in the axial direction. It is installed. The second mounting bracket 14 has a large-diameter substantially disk shape, and the diameter dimension thereof is substantially the same as the outer diameter dimension of the flange-shaped portion 34 of the sleeve bracket 18. A fixing bolt 58 is integrally formed at the central portion of the second mounting bracket 14 and protrudes downward. The second mounting bracket 14 is positioned on the concentric shaft with the integrally vulcanized molded product 44 of the main rubber elastic body 16, and the outer peripheral portion of the second mounting bracket 14 is interposed between the seal rubber layer 52 and the bowl-shaped portion. 34 or overlapped with the lower end portion of the outer peripheral wall 28 of the sleeve fitting 18, and the radial intermediate portion of the second mounting fitting 14 is connected to the lower end portion of the inner peripheral wall 26 of the sleeve fitting 18 via the seal rubber layer 52. Is superimposed.

  A stopper fitting 60 as a cylindrical stopper member is disposed on the assembly of the integrally vulcanized molded product 44 of the main rubber elastic body 16 and the second mounting fitting 14. The stopper fitting 60 has a large-diameter cylindrical shape, and a large-diameter ring-shaped caulking portion 62 is integrally formed at the lower end portion. Moreover, the upper end part of the stopper metal fitting 60 bends to the inner peripheral side, and an inner flange-shaped second contact part 64 that extends substantially flat in the direction perpendicular to the axis is formed. In particular, the inner diameter of the stopper fitting 60 is made larger than the outer diameter of the outer peripheral wall 28 to which the diaphragm 46 of the sleeve fitting 18 is fixed. Further, the inner diameter dimension of the second abutting portion 64 of the stopper fitting 60 is made smaller than the outer diameter dimension of the first abutting portion 24 of the first mounting bracket 12.

  The flange portion 34 of the sleeve fitting 18 and the outer peripheral portion of the second mounting fitting 14 that are overlapped with each other in the axial direction are fitted into the caulking portion 62 of the stopper fitting 60, and the caulking portion 62 is caulked. Yes. Thus, the integrally vulcanized molded product 44 of the main rubber elastic body 16, the second mounting bracket 14, and the stopper bracket 60 are fixed to each other in a form in which they are positioned on the substantially concentric shaft.

  Further, based on the caulking fixing force of the caulking portion 62, the seal rubber layer 52 between the radial intermediate portion of the second mounting bracket 14 and the lower end portion of the inner peripheral wall 26 of the sleeve bracket 18 is compressed and deformed in the axial direction. Since the second mounting bracket 14 and the inner peripheral wall 26 are overlapped in the axial direction, the opening portion inside the inner peripheral wall 26 of the sleeve bracket 18 is covered with the second mounting bracket 14 in a fluid-tight manner. Further, the seal rubber layer 52 between the outer peripheral portion of the second mounting bracket 14 and the flange portion 34 or the edge of the opening window 36 of the sleeve bracket 18 is compressed and deformed in the axial direction, and the second mounting bracket 14 and Since the hook-shaped portion 34 is overlapped in the axial direction, the opening portion of the groove portion 32 between the inner peripheral wall 26 and the outer peripheral wall 28 in the sleeve metal fitting 18 is covered with the second mounting metal fitting 14 in a fluid-tight manner. Yes. As is clear from this, the opening on the other axial direction (lower in FIG. 1) of the sleeve metal fitting 18, that is, the opening on the inner peripheral wall 26 and the opening on the outer peripheral wall 28 are fluidized by the second attachment metal 14. Closely covered.

  Therefore, the space between the large-diameter recess 42 of the main rubber elastic body 16 and the second mounting bracket 14 inside the inner peripheral wall 26 of the sleeve metal fitting 18 is the inner peripheral wall 26, the main rubber elastic body 16, and the second attachment. A pressure receiving chamber 66, which is provided by the metal fitting 14 and in which a pressure fluctuation is generated based on the elastic deformation of the main rubber elastic body 16, is formed in the space. Further, the space between the portion where the diaphragm 46 and the elastic rubber film 48 are formed in the groove portion 32 of the sleeve metal fitting 18 and the second attachment metal fitting 14 is defined by the diaphragm 46, the elastic rubber film 48 and the second attachment metal fitting 14. In this space, an equilibrium chamber 68 is formed in which the volume change is easily allowed based on the elastic deformation of the diaphragm 46. That is, the equilibrium chamber 68 is formed on the outer peripheral side of the pressure receiving chamber 66 with the elastic rubber film 48 in the sleeve fitting 18 interposed therebetween. As is clear from the above description, a part of the wall portion of the pressure receiving chamber 66 is constituted by the main rubber elastic body 16 and a part of the wall portion of the equilibrium chamber 68 is constituted by the diaphragm 46. Yes.

  The pressure receiving chamber 66 and the equilibrium chamber 68 are filled with an incompressible fluid. As the sealing fluid, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is adopted, and in order to effectively obtain a vibration isolation effect based on a fluid action such as a resonance action of the fluid, 0.1 Pa · It is desirable to employ a low-viscosity fluid of s or less. For example, the incompressible fluid is sealed in the pressure receiving chamber 66 or the equilibrium chamber 68 with respect to the integrally vulcanized molded product 44 of the main rubber elastic body 16 including the first mounting bracket 12 and the sleeve bracket 18. The mounting bracket 14 and the stopper bracket 60 are preferably realized in an incompressible fluid.

  Further, based on the caulking fixing force of the caulking portion 62, the lower end portion of the main rubber elastic body 16 filled in the groove portion 32 and the seal rubber layer 52 are compressed and deformed in the axial direction and overlapped with the second mounting bracket 14. As a result, the opening portion of the circumferential groove 50 formed in the filled main rubber elastic body 16 is fluid-tightly covered with the second mounting member 14. As a result, an orifice passage 70 extending in the circumferential direction with a predetermined length in the groove portion 32 of the sleeve fitting 18 disposed on the outer peripheral side of the pressure receiving chamber 66 is formed, and one end portion in the circumferential direction of the orifice passage 70 is formed. Is connected to the pressure receiving chamber 66 through the communication hole 40 of the sleeve fitting 18, and the other end in the circumferential direction of the orifice passage 70 is connected to the equilibrium chamber 68. The equilibrium chamber 68 is communicated with each other so that fluid flow through the orifice passage 70 is allowed between the chambers 66 and 68.

  In the present embodiment, the resonance frequency of the fluid flowing through the orifice passage 70 is effective against vibrations in a low frequency region around 10 Hz corresponding to engine shake or the like based on the resonance action of the fluid. It is tuned so that the damping effect is demonstrated. The orifice passage 70 is tuned by, for example, the rigidity of the wall springs of the pressure receiving chamber 66 and the equilibrium chamber 68, that is, the main rubber elastic body 16 corresponding to the amount of pressure change required to change the chambers 66 and 68 by a unit volume. It is possible to adjust the passage length and passage cross-sectional area of the orifice passage 70 while taking into consideration the characteristic values based on the respective elastic deformation amounts such as the diaphragm 46 and the diaphragm 46. In general, the pressure transmitted through the orifice passage 70 The frequency at which the phase of the fluctuation changes to bring about the resonance state can be grasped as the tuning frequency of the orifice passage 70.

  A pressure receiving chamber 66 is provided on one side (right side in FIG. 1) sandwiching an elastic rubber film 48 disposed on the inner peripheral wall 26 of the sleeve metal fitting 18 in the thickness direction, and the other (in FIG. An equilibrium chamber 68 is provided on the left). Thus, the pressure fluctuation absorbing mechanism is configured such that the pressure of the pressure receiving chamber 66 is exerted on one surface of the elastic rubber film 48 and the pressure of the equilibrium chamber 68 is exerted on the other surface of the elastic rubber film 48. Yes. In particular, in the present embodiment, when vibration is input in the middle frequency range of about 20 to 40 Hz corresponding to idling vibration, low-speed booming sound, and the like, the vibration isolation effect is based on the pressure fluctuation absorption effect of the pressure receiving chamber 66 due to elastic deformation of the elastic rubber film 48. The natural frequency of the elastic rubber film 48 is tuned so that (vibration insulation effect based on low dynamic spring characteristics) is effectively exhibited.

  Further, as the stopper fitting 60 is fixed to the integrally vulcanized molded product 44 of the main rubber elastic body 16 and the second mounting fitting 14, the stopper fitting 60 starts from the inner peripheral edge of the second contact portion 64 of the stopper fitting 60. The upper end portion in the axial direction of one mounting bracket 12 protrudes outward in the axial direction, and the second contact portion 64 is arranged above the first contact portion 24 of the first mounting bracket 12 at a predetermined distance. Thus, the first contact portion 24 and the second contact portion 64 are opposed to each other in the axial direction with the buffer rubber layer 56 attached to the first contact portion 24 interposed therebetween. Therefore, when at least one of the first mounting bracket 12 and the second mounting bracket 14 is displaced in the axial direction (so-called rebound direction) when the mount 10 is mounted on the vehicle, When the abutting portion 24 and the second abutting portion 64 abut against each other via the buffer rubber layer 56, the relative displacement in the rebound direction of the first mounting bracket 12 and the second mounting bracket 14 is buffered. It is supposed to be limited to. As is clear from this, the stopper mechanism in the rebound direction of the first mounting bracket 12 and the second mounting bracket 14 includes a stopper bracket 60 including a first contact portion 24 and a second contact portion 64, The buffer rubber layer 56 is included.

  In this state, when the sleeve metal fitting 18 is assembled to the integrally vulcanized molded product 44 of the main rubber elastic body 16, the cylindrical portion of the stopper metal fitting 60 has a predetermined distance outward in the direction perpendicular to the axis of the outer peripheral wall 28 of the sleeve metal fitting 18. In an initial state where the diaphragm 46 is not deformed as shown in FIGS. 1 and 2, the outer peripheral wall portion of the diaphragm 46 and the cylindrical portion of the stopper fitting 60 are also predetermined in the direction perpendicular to the axis. Opposite positions are spaced apart and a gap is provided between them.

  Further, the second contact portion 64 of the stopper fitting 60 is positioned above the first contact portion 24 of the first mounting bracket 12 that is positioned above the sleeve fitting 18 to which the diaphragm 46 is fixed. As a result, the second contact portion 64 is positioned slightly above the upper wall portion of the diaphragm 46, and the upper wall portion of the diaphragm 46 and the second contact portion 64 are spaced apart from each other by a predetermined distance in the axial direction. It is made to oppose.

  Further, the inner diameter dimension of the second abutting portion 64 is made smaller than the diameter dimension of the first abutting portion 24 which is smaller than the outer diameter dimension of the outer peripheral wall 28 of the sleeve fitting 18 to which the diaphragm 46 is fixed. The diameter of the outer peripheral wall 28 is sufficiently small. As a result, the inner peripheral edge of the second contact portion 64 is positioned above the diaphragm 46 in such a manner that it is inserted inwardly in the direction perpendicular to the axis from the diaphragm 46.

  That is, between the axially opposed surfaces of the second mounting bracket 14 and the second abutting portion 64 of the stopper fitting 60 between the outer peripheral wall 28 of the sleeve fitting 18 and the axially perpendicular facing surface of the cylindrical portion of the stopper fitting 60, While the diaphragm 46 is allowed to be elastically deformed, the entire diaphragm 46 is covered with a stopper fitting 60 having a second contact portion 64. As a result, the diaphragm 46 is protected from the outside by the stopper fitting 60.

  In particular, the first contact portion 24 is positioned between the diaphragm 46 and the second contact portion 64 in the axial direction, and the first contact portion 24 and the second contact portion 64 are connected to the first and second attachment portions. In order to constitute a stopper mechanism in the rebound direction of the metal fittings 12, 14, in addition to being overlapped with each other in the direction perpendicular to the axis, a buffer is provided between the first contact portion 24 and the second contact portion 64 in the axial direction. A rubber layer 56 is provided. Thereby, using the stopper mechanism, foreign matters such as engine oil, muddy water, and pebbles are prevented from entering between the stopper fitting 60 and the sleeve fitting 18 from the inner peripheral edge of the second contact portion 64. .

  Further, in the present embodiment, the upper end portion of the first mounting member 12 positioned on the opposite side of the first contact part 24 across the second contact part 64 of the stopper metal 60 is perpendicular to the axis. A lid member 72 made of a rubber elastic material is disposed so as to spread in an annular shape. The outer diameter dimension of the lid member 72 is made larger than the outer diameter dimension of the second abutting portion 64, so that it is sufficiently larger than the inner diameter dimension of the second abutting portion 64. Accordingly, the lid member 72 is disposed so as to cover the inner peripheral edge portion of the second contact portion 64 from above. As a result, foreign matter is further prevented from entering between the stopper fitting 60 and the sleeve fitting 18 from the inner peripheral edge of the second contact portion 64.

  In the automotive engine mount 10 having the above-described structure, the fixing bolt 22 fixed to the first mounting bracket 12 is screwed and fixed to a power unit-side mounting member (not shown). While the mounting bracket 12 is attached to the power unit, the fixing bolt 58 projecting from the second mounting bracket 14 is screwed and fixed to a mounting member on the vehicle body side (not shown). The mounting bracket 14 is attached to the vehicle body. Thus, the automobile engine mount is mounted between the power unit and the body in the automobile, and the power unit is supported in a vibration-proof manner with respect to the body.

  In particular, in the engine mount 10 according to the present embodiment, a pair of straight portions 54, 54 formed on the main rubber elastic body 16 are positioned in one direction perpendicular to the axis (in FIG. ) Is the vehicle front-rear direction, and is mounted on the automobile so that the direction (right and left in FIG. 6) perpendicular to the one direction perpendicular to the axis through the mount center axis is the vehicle left-right direction. As a result, the spring ratio of the mount 10 in the vehicle front-rear direction and the vehicle left-right direction is increased, and the ride comfort and steering stability of the vehicle are improved.

  In the automobile engine mount 10 in such a mounted state, when vibrations in a low frequency region such as an engine shake which is a problem during traveling are input, a relatively large pressure fluctuation is generated in the pressure receiving chamber 66. Since this pressure is large, the elastic rubber film 48 tuned to a small amplitude cannot substantially absorb the pressure in the pressure receiving chamber 66. Therefore, the flow amount of the fluid through the orifice passage 70 is effectively ensured by the difference in the relative pressure fluctuation generated between the pressure receiving chamber 66 and the equilibrium chamber 68, and the fluid action such as the resonance action of the fluid is achieved. Based on this, an anti-vibration effect (high damping effect) effective against low-frequency vibrations such as engine shake is exhibited.

  In addition, when an idling vibration that is a problem when the vehicle is stopped or a vibration in a medium frequency range such as a low-speed booming sound that is a problem when traveling is performed, a pressure fluctuation with a small amplitude is caused in the pressure receiving chamber 66. At that time, since the frequency range of the vibration is higher than the tuning frequency of the orifice passage 70, the fluid passage resistance of the orifice passage 70 is remarkably increased due to the antiresonant action, and is substantially closed. In view of this, the pressure fluctuation of the pressure receiving chamber 66 is absorbed on the basis of the elastic deformation of the elastic rubber film 48 tuned to the middle frequency range, so that a significantly high dynamic spring resulting from the substantial blockage of the orifice passage 70. Will be avoided. Therefore, a good anti-vibration effect (vibration insulation effect based on the low dynamic spring characteristics) against vibration in the middle frequency range is exhibited.

  Further, since the entire diaphragm 46 is covered with the stopper fitting 60, the interference of foreign matter and other members to the diaphragm 46 is prevented, and damage to the diaphragm 46 is avoided.

  In this case, the stopper fitting 60 has the second contact portion 64 at the upper end portion and is configured as a part of the stopper mechanism in the rebound direction, so that it functions as both a member that protects the diaphragm 46 and the stopper member. Therefore, the number of parts can be reduced and the manufacturing process can be shortened.

  In addition, since the first contact portion 24 and the second contact portion 64 that overlap each other in the direction perpendicular to the axis are disposed above the diaphragm 46, the foreign matter is stopped from the inner peripheral edge of the second contact portion 64. Intrusion between the metal fitting 60 and the main rubber elastic body 16 or the sleeve metal fitting 18 is preferably prevented, and the prevention of foreign matter interference with the diaphragm 46 is highly realized. In addition, in this embodiment, since the lid member 72 is disposed above the second contact portion 64, the entry of foreign matter from the inner peripheral edge portion of the second contact portion 64 is further advantageously suppressed.

  In the present embodiment, the diaphragm 46 and the elastic rubber film 48 are each integrally formed with the main rubber elastic body 16 and incorporated into the integrally vulcanized molded product 44 of the main rubber elastic body 16. There is no need to attach a fixing member to 46 or the elastic rubber film 48 separately and assemble it to the integrally vulcanized molded product 44. Thereby, the number of parts and the manufacturing process can be reduced.

  Therefore, in the automobile engine mount 10 according to the present embodiment, the hydraulic pressure absorbing function by the elastic rubber film 48, the stopper function by the first and second contact portions 24, 64, and the diaphragm 46 by the stopper fitting 60 and the like. The cost reduction can be advantageously achieved while each of the protective functions is effectively exhibited.

  Further, in the present embodiment, a part of the wall portion of the orifice passage 70 is configured to include the circumferential groove 50 formed in the main rubber elastic body 16 in the groove portion 32 of the sleeve fitting 18. By changing the shape and size of the rubber elastic body 16, the cross-sectional area and length of the circumferential groove 50, and thus the shape and size of the orifice passage 70 can be easily changed. Therefore, the tuning performance of the resonance frequency of the fluid that is caused to flow through the orifice passage 70 is improved, and the intended vibration isolation effect can be obtained to a higher degree.

  As mentioned above, although one embodiment of the present invention has been described in detail, the present invention is not limited in any way by the specific description in the embodiment, and various changes, modifications, and modifications based on the knowledge of those skilled in the art. Needless to say, the present invention can be implemented in a mode with improvements and the like, and all such modes are included in the scope of the present invention without departing from the gist of the present invention.

  For example, the shape and size of the sleeve fitting 18, the diaphragm 46, the elastic rubber film 48, the orifice passage 70, and the first contact portion 24 constituting the rebound stopper mechanism, the stopper fitting 60, the second contact portion 64, and the like. The configuration such as structure, arrangement, number, and the like are set and changed according to the required anti-vibration performance, stopper function, manufacturability, etc., and are not limited to those illustrated. Specifically, for example, a plurality of diaphragms 46 are disposed apart from each other in the circumferential direction of the sleeve fitting 18 to form a plurality of equilibrium chambers, or a plurality of orifice passages are formed in the groove portion 32 of the sleeve fitting 18. The tuning frequency of the orifice passage may be varied.

  Moreover, in the said embodiment, although the 1st contact part 24 and the 2nd contact part 64 were made into the annular shape continuously extended over the perimeter of the circumferential direction, it is a predetermined length in the circumferential direction. It may be an arc shape that extends, or a plurality of arcs may be formed apart in the circumferential direction.

  Furthermore, in the said embodiment, although the inner peripheral wall 26 and the outer peripheral wall 28 were connected by the connection part 30 of the circular-arc-shaped cross section which protrudes upwards in the sleeve metal fitting 18, for example, a connection part is upward. The shape may be a tapered cylindrical shape whose diameter dimension gradually decreases from the bottom to the bottom, an annular plate shape that spreads flat in the direction perpendicular to the axis, or the like.

  Furthermore, in the above-described embodiment, when the stopper fitting 60 is fixed to the second attachment fitting 14 or the sleeve fitting 18, the outer peripheral portion of the second attachment fitting 14 or the flanged portion 34 of the sleeve fitting 18 is the stopper fitting 60. The caulking portion 62 is fitted into the caulking portion 62 so that the caulking portion 62 is subjected to the caulking processing. For example, the stopper fitting 60 is not provided with the caulking portion 62 but formed on the outer peripheral edge portion of the stopper fitting 60. The flange-shaped portion, the flange-shaped portion 34 of the sleeve fitting 18 and the outer peripheral portion of the second mounting fitting 14 may be overlapped in the axial direction and fixed by welding, bolts or the like.

  In addition, in the above-described embodiments, specific examples of applying the present invention to an automobile engine mount have been described. However, the present invention is not limited to an automobile body mount, a differential mount, or the like, and is also used for vibration isolation of various vibrators other than an automobile. Any of them can be applied to the mount.

The longitudinal cross-sectional view of the engine mount for motor vehicles as one Embodiment of this invention. II-II sectional drawing of FIG. It is a longitudinal cross-sectional view of the sleeve metal fitting which comprises a part of the engine mount for motor vehicles, Comprising: The figure corresponded in the III-III cross section of FIG. The bottom view of the sleeve metal fitting. FIG. 6 is a longitudinal sectional view of an integrally vulcanized molded product of a main rubber elastic body provided with a first mounting bracket and a sleeve bracket constituting a part of the engine mount for the automobile, and a view corresponding to a VV section of FIG. 6. . The bottom view of the integral vulcanization molding product of the main body rubber elastic body.

Explanation of symbols

10: Automotive engine mount, 12: First mounting bracket, 14: Second mounting bracket, 16: Rubber elastic body, 18: Sleeve bracket, 24: First contact portion, 26: Inner peripheral wall, 28: Outer peripheral wall, 36: opening window, 46: diaphragm, 48: elastic rubber film, 56: buffer rubber layer, 60: stopper metal fitting, 64: second contact portion, 66: pressure receiving chamber, 68: equilibrium chamber, 70: orifice aisle

Claims (5)

The first mounting member is spaced apart from one side of the opening of the sleeve member in the axial direction, and the first mounting member and the sleeve member are connected by the main rubber elastic body, and the other axial opening of the sleeve member is connected. A second mounting member is fixed to the side of the cover, and the other opening in the axial direction is fluid-tightly covered, and a pressure receiving chamber in which a part of the wall is formed of the main rubber elastic body and a part of the wall are Forming an equilibrium chamber composed of a flexible rubber film, enclosing an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and forming an orifice passage that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other In the type vibration isolator,
The sleeve member is formed into a cylindrical shape extending in the circumferential direction with a groove-shaped cross section that opens in the other axial direction. The pressure receiving chamber is formed inside the inner peripheral wall of the sleeve member, and an opening window is formed in a part of the outer peripheral wall of the sleeve member. The opening window is integrated with the main rubber elastic body. Closed by the formed flexible rubber film, the equilibrium chamber is formed in the groove portion of the sleeve member, and the orifice passage is formed to extend in the circumferential direction in the groove portion. A movable rubber film integrally formed with the main rubber elastic body is provided on the inner peripheral wall of the sleeve member that is opposed to the flexible rubber film in a direction perpendicular to the axis, and one of the movable rubber films is provided. Pressure of the pressure receiving chamber is exerted on the surface, and A pressure fluctuation absorbing mechanism is configured such that the pressure of the equilibrium chamber is exerted on the other surface of the movable rubber film, and the first mounting member has a first abutting portion extending in a direction perpendicular to the axis. A cylindrical stopper member is fixed to the outer peripheral portion of the second mounting member and extends outside the first abutting portion in the axial direction, and the tip end portion of the stopper member is on the inner peripheral side. And a second abutting portion that is opposed to the first abutting portion and is axially spaced apart from the first abutting portion. A shock-absorbing rubber is provided on at least one side to form a stopper mechanism in the rebound direction, and the flexible rubber film is covered with the stopper member. apparatus.   An outer flange-shaped portion is integrally formed at the opening end of the outer peripheral wall of the sleeve member, and the outer flange-shaped portion and the outer peripheral portion of the second mounting member are overlapped with each other in the axial direction. A ring-shaped caulking portion is integrally formed at the other opening end in the axial direction of the stopper member, and the outer flange portion and the outer peripheral portion of the second mounting member are fitted into the caulking portion. The fluid-filled vibration isolator according to claim 1, wherein the second mounting member, the sleeve member, and the stopper member are fixed to each other by being caulked.   A lid member is disposed on a portion of the first mounting member opposite to the first abutting portion across the second abutting portion of the stopper member, and an outer peripheral portion of the lid member is the second abutting portion. 3. The inner peripheral edge portion of the second contact portion is entirely covered with the lid member by extending outward in the direction perpendicular to the axis from the inner peripheral edge portion of the contact portion. The fluid-filled vibration isolator described in 1.   Applied to automotive engine mounts, the orifice passage is tuned to exhibit a damping effect in the low frequency range corresponding to the engine shake input during traveling, and idling vibration during stopping and low speed during traveling The natural frequency of the movable rubber film is tuned so that the pressure in the pressure receiving chamber is absorbed based on elastic deformation of the movable rubber film when a vibration in the middle frequency range corresponding to a booming sound is input. 4. The fluid-filled vibration isolator according to any one of 3 above.   A pair of straight portions are provided in one direction perpendicular to the axis across the first mounting member of the main rubber elastic body, and one direction perpendicular to the axis in which the pair of straight portions are opposed to each other is the vehicle front-rear direction and The fluid-filled type prevention according to any one of claims 1 to 4, wherein the engine mount for an automobile is configured by being mounted on an automobile such that a direction perpendicular to the one direction perpendicular to the axis is a lateral direction of the vehicle. Shaker.

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