JP2008163972A - 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 increasing the degree of freedom of design while downsizing it. <P>SOLUTION: A body rubber elastic body 16 is fixed to an opening peripheral part on a small-diameter part 26 side of a second mounting member 14 having a stepped cylindrical shape; an opening on a large-diameter part 28 side is covered with a lid member 60; an opening window 36 formed over the large-diameter part 28 from a step part 24 is closed by a flexible rubber film 44 formed integrally with the body rubber elastic body 16; an orifice member 62 is projected from the lid member 60 toward the step part 24 of the second mounting member 14; and, by fluid-tightly bringing a projection part of the orifice member 62 into contact with the inside edge part of the step part 24, a pressure reception chamber 72 and an equilibrium chamber 74 are formed on the inner periphery side of the orifice member 62 and on the outer periphery side thereof, respectively, and an orifice passage 78 is formed to extend in the circumferential direction. <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 flexible membrane is generally formed separately from the vulcanized molded product of the main rubber elastic body having the first and second mounting members. When the flexible membrane is assembled to the vulcanized molded product, a fixing member (bottom plate) is provided on the outer peripheral portion of the flexible membrane, and the fixing member is fixed to the second mounting member of the vulcanized molded product. It has become so. 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. A window portion is formed on the outer peripheral wall portion of the sleeve member, a flexible film is fixed to the edge portion of the window portion, and the second mounting member is caulked and fixed to the lower end portion of the sleeve member. Since the sleeve member opening is closed fluid-tightly, a pressure receiving chamber is formed inside the inner wall portion of the sleeve member, and the sleeve member is balanced between the inner wall portion and the outer wall portion. A chamber is formed. 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 wall portion. In such a vibration isolator, there is no need to provide a fixing member on the outer peripheral portion of the flexible film and separately fix it to the second mounting member of the vulcanized molded product. Vulcanization molding can be performed together with the main rubber elastic body, and 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, the inner wall portion of the sleeve member in which the orifice passage is formed has a thin, substantially cylindrical shape, and the shape and size of the orifice passage are the same. Therefore, the tuning of the resonance frequency of the fluid through the orifice passage may be difficult to set to a target value. Moreover, since the sleeve member is integrally vulcanized with the main rubber elastic body, the design freedom of the equilibrium chamber and the orifice passage is sufficient due to the design change of the sleeve member accompanying the tuning of the main rubber elastic body. There was a problem that was difficult to secure. Furthermore, the design change of the mold for the main rubber elastic body itself may be required due to the change in the design of the orifice passage, and the tuning of the orifice passage may be troublesome and costly. In the technical field of such a fluid-filled vibration isolator, the design of the orifice passage, pressure receiving chamber, equilibrium chamber, and the like is often changed depending on the required vibration isolating performance and usage conditions. Thus, if the degree of freedom in design is small, it is difficult to say that the practicality is sufficiently excellent.

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 that, while achieving compactness, the degree of design freedom is increased, and the desired vibration isolation effect is achieved. An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure that can be obtained stably.

  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 and the second mounting member are separated from each other on the one opening side in the axial direction of the second mounting member having a cylindrical shape. The members are connected by a rubber elastic body, and a lid member is disposed on the other opening side of the second mounting member in the axial direction so that the other opening in the axial direction is fluid-tightly closed and part of the wall portion Forming a pressure receiving chamber composed of a rubber elastic body and an equilibrium chamber in which a part of the wall is composed of a flexible rubber film, enclosing an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, In a fluid-filled vibration isolator having an orifice passage that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other, one of the axial directions is a small diameter portion and the other axial direction is a large diameter portion across a stepped portion that extends in a direction perpendicular to the axis The second mounting member is formed with a stepped cylindrical shape, and the small diameter side A rubber elastic body is fixed to the peripheral edge of the mouth, and the opening on the large diameter side is covered with a lid member, while an opening window extending from the stepped portion to the large diameter portion is formed. Is closed with a flexible rubber film integrally formed with the main rubber elastic body, and an orifice member having an annular shape is projected from the lid member toward the step portion of the second mounting member, The protruding tip portion of the orifice member is in fluid tight contact with the inner peripheral edge portion of the stepped portion, so that a pressure receiving chamber is formed on the inner peripheral side of the orifice member and an equilibrium chamber is formed on the outer peripheral side of the orifice member. In addition, the fluid-filled vibration isolator is formed so that the orifice passage extends in the circumferential direction.

  In such a fluid-filled vibration isolator having a structure according to the present invention, the tip end portion of the orifice member protruding from the lid member is overlapped with the inner peripheral edge portion of the step portion of the second mounting member. Since the pressure receiving chamber is formed inside the orifice member and the equilibrium chamber is formed on the outer peripheral side, the orifice member and the second member are not affected by the tuning of the main rubber elastic body. The design of the large-diameter part of the mounting member can be changed.

  Moreover, since the orifice member has a separate structure from the second mounting member, for example, without changing the standard of the second mounting member, only by changing the design of the orifice member, the pressure receiving chamber, the equilibrium chamber, It is possible to change the design of the orifice passage.

  Further, since the orifice passage is formed to extend in the circumferential direction, the passage length can be set large, and the degree of tuning freedom can be further improved.

  Furthermore, since the equilibrium chamber is formed on the outer peripheral side of the pressure receiving chamber sandwiching the orifice member using the large diameter portion of the second mounting member, the axial dimension of the vibration isolator is kept low, The space for forming the equilibrium chamber is effectively secured.

  Therefore, in the fluid-filled vibration isolator according to the present invention, the size reduction is advantageously achieved, the degree of tuning freedom is improved, and the desired vibration isolating effect can be stably obtained.

  Further, in the fluid filled type vibration damping device according to the present invention, a locking groove extending in the circumferential direction is formed in the protruding tip portion of the orifice member, and the engaging groove is engaged with the inner peripheral edge portion of the step portion of the second mounting member. A structure in which a locking projection corresponding to the shape of the locking groove is provided, and the locking projection is fitted and fixed in the locking groove is suitably employed. According to such a structure, the orifice member can be stably assembled to the second mounting member, and based on the prevention of positional deviation between the stepped portion of the second mounting member and the contact portion of the orifice member, The fluid tightness of the equilibrium chamber can be further advantageously improved. In addition, the lid member for projecting the orifice member can be stably assembled to the second mounting member, so that the durability of the vibration isolator can be improved.

  In the fluid filled type vibration damping device according to the present invention, a through hole is formed in the protruding tip portion of the orifice member so as to penetrate the locking groove in the width direction and connect the pressure receiving chamber and the equilibrium chamber to each other. In addition, at least a part of the locking protrusion at the inner peripheral edge of the small-diameter portion is formed of a movable rubber film integrally formed with the main rubber elastic body, and the movable rubber film is fitted into the locking groove to make the through hole fluid-tight. The pressure fluctuation absorbing mechanism is configured such that the pressure of the pressure receiving chamber is exerted on one surface of the movable rubber film and the pressure of the equilibrium chamber is exerted on the other surface of the movable rubber film. It can be suitably employed. According to such a structure, even when the orifice passage is substantially closed due to the antiresonant action of the fluid that flows through the orifice passage at the time of vibration input in a frequency range higher than the tuning frequency of the orifice passage, The pressure in the pressure receiving chamber is absorbed by the elastic deformation of the movable rubber film. 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 particular, in this structure, the movable rubber film is integrally formed with the main rubber elastic body, and is provided so as to partition a part of the pressure receiving chamber and the equilibrium chamber using a fitting structure to the engaging groove of the orifice member. Therefore, the movable rubber film will be installed without increasing the number of new parts and manufacturing processes for fixing the movable rubber film to the vulcanized molded product of the main rubber elastic body, improving manufacturing efficiency and reducing costs. Can be advantageously achieved.

  In the fluid-filled vibration isolator according to the present invention, the orifice 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 end of the orifice member is in close contact with the lid member. By overlapping, the opening portion of the groove portion between the inner peripheral wall and the outer peripheral wall of the orifice member is fluid-tightly covered with the lid member, so that the orifice passage extends in the circumferential direction in the groove portion of the orifice member. The formed structure may be adopted. According to such a structure, the orifice passage can be realized with a relatively simple structure, and a length extending in the circumferential direction of the orifice passage can be suitably secured by using the groove-shaped cross section of the orifice member.

  In the fluid-filled vibration isolator according to the present invention, the first mounting member is provided with a first contact portion that extends in the direction perpendicular to the axis, and one axially open end of the second mounting member. An outer flange-like hook-shaped part is integrally formed on the outer periphery, and a cylindrical stopper member extending in the axial direction outside the first abutting part is fixed to the outer peripheral portion of the hook-shaped part. The portion bends to the inner peripheral side and constitutes a second abutting portion that is spaced apart from the first abutting portion in the axial direction and is opposed to the first abutting portion. A structure in which a stopper mechanism in the rebound direction is configured by providing a buffer rubber on at least one of the contact portions may be adopted. According to such a structure, since the relative displacement amount in the rebound direction of the first mounting member and the second mounting member is suppressed, the stress of the main rubber elastic body connecting them is reduced, and the durability is improved. 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.

  Furthermore, in the fluid filled type vibration isolator according to the above-described present invention, the hook-shaped portion provided on the second mounting member is more than the flexible rubber film closing the opening window of the second mounting member. A structure that protrudes outward in the direction perpendicular to the axis and in which the hook-shaped portion and the flexible rubber film are positioned to face each other in the axial direction can be suitably employed. According to such a structure, the equilibrium chamber is provided in the empty space between the flange-like portion and the large-diameter portion of the second mounting member that are opposed to each other in the axial direction, and the space is effectively utilized. Therefore, the downsizing of the apparatus can be achieved more advantageously. Further, for example, when fixing the orifice member or the lid member to the second mounting member, the assembly work can be stabilized by enlarging the portion that supports the second mounting member using the hook-shaped portion. Alternatively, when the vibration isolator is attached to the vibration isolation target, the hook-shaped portion can be used as a protective member that covers the flexible rubber film from one side in the axial direction. Accordingly, it is not necessary to newly provide a special member, and cost reduction can be advantageously achieved by preventing an increase in the number of parts and reducing the manufacturing process.

  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 a first embodiment according to the fluid-filled vibration isolator of the present invention. The automobile engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are connected by a main rubber elastic body 16. 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 18 that opens to the upper end surface is provided at the center portion thereof. A fixing bolt 20 is screwed into the screw hole 18. Also, an outer flange-shaped first abutting portion 22 that extends substantially flat in the direction perpendicular to the axis is integrally formed at an axially intermediate portion of the first mounting bracket 12.

  On the other hand, as shown in FIGS. 3 and 4, the second mounting bracket 14 has a large-diameter substantially stepped cylindrical shape as a whole, and is substantially perpendicular to the axial direction at the axially intermediate portion thereof. One axial direction (upper in FIG. 1) sandwiching a flat annular ring-shaped stepped portion 24 is a small-diameter cylindrical small-diameter portion 26, and the other axial direction (lower in FIG. 1) is the other. The large-diameter portion 28 has a large-diameter cylindrical shape.

  A hook-shaped portion 30 is provided at the opening end portion of the small diameter portion 26 which is one opening end portion in the axial direction of the second mounting bracket 14. The bowl-shaped portion 30 has an annular plate shape that extends substantially flat in the direction perpendicular to the axis from the opening end of the small-diameter portion 26, and the outer diameter of the flange-shaped portion 30 is the first contact portion 22 of the first mounting bracket 12. The outer diameter dimension is sufficiently larger than the outer diameter dimension of the second mounting bracket 14 and the outer diameter dimension of the stepped portion 24 and the large diameter portion 28 of the second mounting bracket 14. Further, a ring-shaped caulking portion 32 protruding upward is integrally formed at the outer peripheral edge portion of the bowl-shaped portion 30. Further, a large-diameter ring-shaped caulking portion 34 that protrudes downward is integrally formed at the other opening end of the large-diameter portion 28 in the axial direction.

  In the second mounting bracket 14, an opening window 36 is formed at a portion from the inner peripheral portion of the step portion 24 integrally formed with the axial end portion of the small diameter portion 26 to the substantially entire axial direction of the large diameter portion 28. Has been. The opening window 36 penetrates the stepped portion 24 and the large diameter portion 28 in each thickness direction, and has a cutout window shape extending in the circumferential direction by a predetermined length. In particular, in the present embodiment, the two opening windows 36 are provided at a predetermined distance in the circumferential direction.

  The first mounting bracket 12 is spaced apart from the opening (on the upper side in FIG. 1) where the flange-shaped portion 30 of the second mounting bracket 14 is formed. The axes are positioned on substantially the same line. 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 truncated cone shape, and a mortar-shaped large-diameter recess 38 that opens downward is provided on an end surface on the large-diameter side. On the small-diameter side end face of the main rubber elastic body 16, a substantially entire portion from the first contact portion 22 and the first contact portion 22 of the first mounting member 12 to the other end in the axial direction (lower in FIG. 1). Is vulcanized and bonded in an embedded state.

  On the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16, the inner peripheral surface including the inner peripheral portion of the flange-shaped portion 30 of the second mounting bracket 14 and the peripheral portion on the opening side of the small-diameter portion 26 is substantially entirely. It is vulcanized and bonded. Further, a thin seal rubber layer 40 integrally formed with the main rubber elastic body 16 is formed so as to cover almost the entire inner peripheral surface of the stepped portion 24 and the large diameter portion 28 of the second mounting bracket 14. . That is, the main rubber elastic body 16 is not directly vulcanized and bonded to the stepped portion 24 and the large diameter portion 28 of the second mounting bracket 14.

  As shown in FIGS. 5 and 6, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 42 including the first mounting bracket 12 and the second mounting bracket 14. Thereby, the first mounting bracket 12 and the second mounting bracket 14 are elastically connected to each other by the main rubber elastic body 16 and one of the second mounting brackets 14 in the axial direction (in FIG. 1). The upper opening is fluid-tightly closed by the main rubber elastic body 16.

  Each opening window 36 of the second mounting bracket 14 is provided with a diaphragm 44 as a flexible rubber film. The diaphragm 44 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 second mounting bracket 14, that is, outward of the second mounting bracket 14. The outer peripheral portion of the diaphragm 44 is vulcanized and bonded to the edge of the opening window 36 so as to bulge and deform. In particular, as shown in FIGS. 1 and 2, the diaphragm 44 has an outer peripheral wall portion positioned radially outward from the large-diameter portion 28 of the second mounting bracket 14 in the initial state where the diaphragm 44 is not deformed. And the upper wall part is located above the opening end part of the large diameter part 28, and it has a shape that bulges outward in the radial direction and the axial direction from the large diameter part 28 as a whole. Thereby, each opening window 36 is covered with a diaphragm 44 in a fluid-tight manner. In addition, each diaphragm 44 is positioned at a predetermined distance in the axial direction from the flange-shaped portion 30 of the second mounting bracket 14, and the outer peripheral edge of the flange-shaped portion 30 is an opening window of each diaphragm 44. It is positioned outward in the direction perpendicular to the axis from the tip portion (outer peripheral wall part) that protrudes outward in the direction perpendicular to the axis from 36. In short, the hook-shaped portion 30 is disposed above the diaphragm 44 so as to cover the diaphragm 44, and the diaphragm 44 is connected to the shaft of the hook-shaped portion 30, the stepped portion 24, and the large-diameter portion 28. It is housed in a vacant space between directions.

  Further, at two locations on the circumference of the large-diameter recess 38 of the main rubber elastic body 16, a pair of straight portions 46 that open to the bottom surface of the recess 38 and extend in a predetermined length in the axial direction is formed. The pair of straight portions 46 are opposed to each other in one direction perpendicular to the axis (left and right in FIG. 6). That is, the static spring constant in one direction perpendicular to the axis provided with the pair of straight portions 46, 46 is made smaller than the static spring constant in the direction perpendicular to the direction perpendicular to the axis. Further, a buffer rubber layer 48 as a buffer rubber integrally formed with the main rubber elastic body 16 is formed on the upper surface of the first contact portion 22 of the first mounting bracket 12.

  In particular, in the present embodiment, a locking rubber 50 as a locking projection is provided on the inner peripheral edge portion of the stepped portion 24 of the second mounting bracket 14. The locking rubber 50 has a cylindrical shape extending downward from the inner peripheral edge portion of the stepped portion 24 and has elasticity by being integrally formed with the main rubber elastic body 16. That is, the locking rubber 50 is opposed to the large-diameter portion 28 of the second mounting member 14 at a predetermined distance in the direction perpendicular to the axis, and is disposed on the concentric axes. The height of the locking rubber 50 is set so as not to reach the opening end of the large diameter portion 28. Further, the thickness dimension of the locking rubber 50 is made larger than the thickness dimension of the diaphragm 44.

  A stopper fitting 52 as a stopper member is disposed on the integrally vulcanized molded product 42 of the main rubber elastic body 16 provided with the first and second attachment fittings 12 and 14. The stopper fitting 52 has a cylindrical shape, and an outer flange-like portion 54 is formed at the other axial end (lower in FIG. 1). In addition, one end portion in the axial direction of the stopper metal fitting 52 is bent toward the inner peripheral side, and a second contact portion 56 in the shape of an annular plate that extends substantially flat in the direction perpendicular to the axis is formed. The outer flange-like portion 54 of the stopper fitting 52 is fitted into the caulking portion 32 of the second mounting fitting 14 and overlapped with the flange-like portion 30 in the axial direction, and the caulking portion 32 is caulked. Yes.

  As a result, the stopper fitting 52 is fixed to the second attachment fitting 14 so as to extend in the axial direction outward in the direction perpendicular to the axis of the first contact portion 22 of the first attachment fitting 12, and the stopper fitting 52. The second contact portion 56 is disposed above the first contact portion 22 of the first mounting bracket 12 at a predetermined distance, and the first contact portion 22 and the second contact portion 56 are The buffer rubber layer 48 attached to the first contact portion 22 is sandwiched between the first contact portions 22 and is opposed to the axial direction. 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 22 and the second abutting portion 56 abut against each other via the buffer rubber layer 48, 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 the first contact portion 22, the second contact portion 56, and the shock absorbing rubber layer 48. It consists of

  Further, in the integrally vulcanized molded product 42 of the main rubber elastic body 16 provided with the first and second mounting brackets 12 and 14, the opening on the other axial direction other side (lower in FIG. 1) of the second mounting bracket 14 is provided. An assembly 58 is assembled from the part side.

  As shown in FIGS. 7 and 8, the assembly 58 has a substantially bottomed cylindrical shape as a whole, and is formed using a hard material such as a metal material or a synthetic resin material. In particular, in this embodiment, the assembly 58 includes a lid portion 60 as a lid member and an orifice cylinder portion 62 as an orifice member, and the lid portion 60 and the orifice cylinder portion 62 are integrally formed. Presents.

  The lid portion 60 has a large-diameter substantially disk shape, and a fixing bolt 64 is integrally formed at a central portion thereof and protrudes downward. In addition, an orifice cylinder portion 62 having a substantially cylindrical shape whose outer diameter dimension is smaller than that of the lid portion 60 is positioned on a concentric axis with the lid portion 60 and protrudes upward from a radial intermediate portion of the lid portion 60. It is installed.

  The orifice cylindrical part 62 has a small diameter and thick cylindrical shape, and its inner diameter is made smaller than the inner diameter of the small diameter part 26 of the second mounting bracket 14 and its outer diameter is smaller. The outer diameter of the small-diameter portion 26 is the same as or larger than that. In addition, a plate portion having a substantially arc shape in plan view is provided at the axially intermediate portion of the outer peripheral wall of the orifice cylindrical portion 62 so that the outer peripheral wall sandwiching the plate portion in the axial direction can be used in the circumferential direction. A circumferential groove 66 extending in a spiral shape with a predetermined length is formed.

  Further, a locking groove 68 is provided in a radially intermediate portion of the protruding tip portion of the orifice cylindrical portion 62. The locking groove 68 is a ring-shaped groove continuously extending over the entire circumference in the circumferential direction with a rectangular concave cross section that opens from the axially intermediate portion of the orifice cylindrical portion 62 to the upper end surface. The width dimension of 68 is the same as or slightly larger than the thickness dimension of the locking rubber 50 integrally formed with the main rubber elastic body 16, and the depth dimension of the locking groove 68 is the locking rubber 50. Therefore, the locking groove 68 has a shape corresponding to the shape of the locking rubber 50. Particularly in the present embodiment, the height of the inner peripheral wall is made larger than the height of the outer peripheral wall in the inner peripheral wall and the outer peripheral wall located on both sides in the width direction of the locking groove 68 in the orifice cylindrical portion 62. Thereby, the upper end surface of the orifice cylinder part 62 is extended in the circumferential direction with the substantially L-shaped cross section in which a height dimension becomes small toward radial direction outward.

  Further, a radial groove 70 as a through hole is formed at one location on the circumference excluding the formation site of the circumferential groove 66 in the orifice cylindrical portion 62. The radial groove 70 has a depth dimension reaching the middle portion in the axial direction of the orifice cylindrical portion 62 so as to cut out the upper end surface of the orifice cylindrical portion 62, and the radial cylindrical groove 62 is arranged in the radial direction (thickness direction). ) And crosses a part of the circumference of the locking groove 68. That is, the radial groove 70 penetrates the locking groove 68 in the width direction. The depth dimension of the radial groove 70 is smaller than that of the locking groove 68. Further, the width dimension of the radial groove 70 gradually increases from one radial end opening in the inner peripheral wall of the orifice cylindrical portion 62 to the other radial end opening in the outer peripheral wall of the orifice cylindrical portion 62. Has been.

  The assembly 58 provided with the lid 60 and the orifice cylinder 62 is the other axial opening (lower in FIG. 1) of the second mounting bracket 14 in the integrally vulcanized molded product 42 of the main rubber elastic body 16. The outer peripheral portion of the lid portion 60 of the assembly 58 is fitted into the caulking portion 34 of the second mounting bracket 14 and the second mounting bracket 14 is sandwiched with the seal rubber layer 40 interposed therebetween. It overlaps with the opening end of the large diameter portion 28 in the axial direction. Further, the outer peripheral edge portion of the plate portion protruding from the outer wall portion of the orifice cylinder portion 62 is overlapped with the large diameter portion 28 in the radial direction with the seal rubber layer 40 interposed therebetween.

  Further, the locking rubber 50 integrally formed with the main rubber elastic body 16 is fitted in the locking groove 68 of the orifice cylindrical portion 62 and the outer peripheral wall sandwiching the locking groove 68 of the orifice cylindrical portion 62. The upper end surface of the portion is overlapped in the axial direction on the inner peripheral edge portion (surface) of the stepped portion 24 of the second mounting bracket 14 via the seal rubber layer 40. A seal rubber layer in which an upper end portion of an inner peripheral wall portion sandwiching the locking groove 68 of the orifice cylindrical portion 62 is interposed between the stepped portion 24 and the orifice cylindrical portion 62 in the axial direction with the locking rubber 50 interposed therebetween. 40, and further, is opposed to the upper end portion of the large-diameter portion 28 of the second mounting bracket 14 in the radial direction with the seal rubber layer 40 interposed therebetween.

  The caulking process is applied to the caulking portion 34 of the second mounting bracket 14 in such a manner that the assembled body 58 is fitted into the second mounting bracket 14.

  As a result, the assembled body 58 is fixed to the second mounting bracket 14 in a form in which the assembled body 58 and the second mounting bracket 14 are positioned on a substantially concentric axis. Further, the seal rubber layer 40 between the outer peripheral portion of the lid portion 60 of the assembly 58 and the other opening edge portion in the axial direction of the second mounting bracket 14 (opening edge portion of the large diameter portion 28) is compressed and deformed in the axial direction. However, since the outer peripheral portion of the lid 60 and the opening edge of the second mounting bracket 14 are overlapped in the axial direction, the other opening in the axial direction of the second mounting bracket 14 is the lid 60. Fluid tightly covered.

  Further, the locking rubber 50 of the integrally vulcanized molded product 42 of the main rubber elastic body 16 is fitted and fixed in a state of being deformed with an appropriate compressive force with respect to the locking groove 68 of the orifice cylindrical portion 62 of the assembly 58. In addition, the seal rubber layer 40 between the upper end portion of the outer peripheral wall portion sandwiching the locking groove 68 of the orifice cylindrical portion 62 and the inner peripheral edge portion of the stepped portion 24 of the second mounting bracket 14 is compressed and deformed in the axial direction. However, the upper end portion of the orifice cylinder portion 62 and the inner peripheral edge portion of the step portion 24 are overlapped in the axial direction. As a result, the protruding tip portion of the orifice tube portion 62 protruding from the lid portion 60 is fluid-tightly contacted with the inner peripheral edge portion of the step portion 24, and the orifice tube portion 62 is moved inside the second mounting bracket 14. The sandwiched inner circumferential space and outer circumferential space are fluid-tightly partitioned by the orifice cylinder portion 62. Further, a plate portion protruding outward in the direction perpendicular to the axial direction from the axial intermediate portion of the orifice cylindrical portion 62 is fitted into the large diameter portion 28 of the second mounting bracket 14, and the outer peripheral edge portion and the large diameter portion of the plate portion are fitted. The plate portion is superposed on the large-diameter portion 28 while the seal rubber layer 40 between 28 is compressed and deformed in the radial direction.

  In the state in which the assembly body 58 is assembled to the second mounting bracket 14 as described above, the diaphragm fixed to the radial intermediate portion of the lid 60, the stepped portion 24 of the second mounting bracket 14, and the opening window 36. 44 is opposed to the upper wall portion of the diaphragm 44 at a predetermined distance in the axial direction, and the orifice cylindrical portion 62, the large-diameter portion 28, and the peripheral wall portion of the diaphragm 44 are spaced at a predetermined distance in the direction perpendicular to the axis. Are opposed to each other. In other words, the space between the lid 60 and the stepped portion 24 and the axially opposed surfaces of the diaphragm 44 between the orifice cylindrical portion 62 and the large-diameter portion 28 and the axially perpendicularly facing surfaces of the diaphragm 44 is the assembly 58 and the second body. The mounting bracket 14 and the diaphragm 44 are provided. In addition, a space between the main rubber elastic body 16 and the lid 60 on the inner peripheral side of the orifice cylinder portion 62 is provided by the assembly body 58 and the main rubber elastic body 16.

  Therefore, a part of the wall portion is configured by the main rubber elastic body 16 in the space that is fluid-tightly partitioned by the central portion of the orifice cylinder portion 62 and the lid portion 60 inside the small diameter portion 26 of the second mounting bracket 14. Thus, a pressure receiving chamber 72 is formed in which pressure fluctuation is generated based on the elastic deformation of the main rubber elastic body 16. Further, in the space inside the large-diameter portion 28 below the step portion 24 of the second mounting bracket 14 and fluid-tightly partitioned by the radially intermediate portion of the orifice cylinder portion 62 and the lid portion 60, FIG. As shown in the figure, a part of the wall portion is composed of a plurality of diaphragms 44 (two in this embodiment) in a substantially semicircular arc-shaped region in plan view extending between the pair of diaphragms 44 and 44 in the circumferential direction. An equilibrium chamber 74 is formed in which volume changes are easily allowed based on the elastic deformations 44 and 44. In other words, the equilibrium chamber 74 is formed on the outer peripheral side of the pressure receiving chamber 72 with the orifice cylinder portion 62 interposed therebetween.

  The pressure receiving chamber 72 and the equilibrium chamber 74 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 72 or the equilibrium chamber 74 by, for example, an assembly 58 of the main rubber elastic body 16 including the first and second mounting brackets 12 and 14 with respect to the integrally vulcanized molded product 42. Is preferably realized by performing the assembly in an incompressible fluid. The stopper fitting 52 fixed to the bowl-shaped portion 30 of the second mounting fitting 14 is fixed in the atmosphere before or after the assembly body 58 is assembled to the integrally vulcanized molded product 42 in an incompressible fluid. Alternatively, the assembly body 58 may be fixed in the incompressible fluid together with the assembly body 58 to the integrally vulcanized molded product 42.

  In addition, the circumferential groove 66 of the orifice cylindrical portion 62 is fluid-tightly covered with the stepped portion 24 and the large diameter portion 28 of the second mounting bracket 14, and one end in the circumferential direction of the circumferential groove 66 is the orifice cylindrical portion 62. The other end in the circumferential direction of the circumferential groove 66 protrudes from the orifice cylinder portion 62 through a communication hole 76 that penetrates the portion below the locking groove 68 in the thickness direction. The plate portion is connected to the equilibrium chamber 74 through one end portion in the circumferential direction of the plate portion (the end portion in the counterclockwise direction in FIG. 2). As a result, an orifice passage 78 that spirally extends on the outer peripheral side of the orifice cylindrical portion 62 in a circumferential direction with a predetermined length (a little less than one turn in the present embodiment) is formed, and is balanced with the pressure receiving chamber 72 through the orifice passage 78. The chambers 74 are communicated with each other so that fluid flow through the orifice passage 78 is allowed between the chambers 72 and 74.

  In the present embodiment, the resonance frequency of the fluid flowing through the orifice passage 78 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 78 is tuned by, for example, the rigidity of the wall springs of the pressure receiving chamber 72 and the equilibrium chamber 74, that is, the main rubber elastic body 16 corresponding to the amount of pressure change required to change the chambers 72 and 74 by a unit volume. It is possible to adjust the length and cross-sectional area of the orifice passage 78 while taking into consideration the characteristic values based on the respective elastic deformation amounts of the diaphragm 44 and the diaphragm 44. In general, the pressure transmitted through the orifice passage 78 The frequency at which the phase of the change changes and becomes a substantially resonant state can be grasped as the tuning frequency of the orifice passage 78.

  Further, one place on the circumference of the locking rubber 50 fitted in the locking groove 68 of the orifice cylindrical portion 62 covers the edge of the radial groove 70 of the orifice cylindrical portion 62 in a fluid tight manner. In the present embodiment, the locking rubber 50 in a portion where the radial groove 70 is covered fluid-tightly functions as the movable rubber film 80, and one surface (right side in FIG. 1) of the movable rubber film 80. The pressure fluctuation absorbing mechanism is configured so that the pressure of the pressure receiving chamber 72 is applied to the other surface and the pressure of the equilibrium chamber 74 is applied to the other surface of the movable rubber film 80. In particular, in the present embodiment, the vibration isolation effect based on the pressure fluctuation absorption effect of the pressure receiving chamber 72 due to the elastic deformation of the movable rubber film 80 at the time of vibration input in the middle frequency range of about 20 to 40 Hz corresponding to idling vibration, low-speed booming sound, and the like. The natural frequency of the movable rubber film 80 is tuned so that (vibration insulation effect based on low dynamic spring characteristics) is effectively exhibited.

  In the automotive engine mount 10 having the above-described structure, the fixing bolt 20 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 64 protruding from the lid portion 60 of the assembly body 58 is screwed and fixed to a vehicle body side mounting member (not shown). The second mounting bracket 14 is attached to the vehicle body via the lid portion 60. 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 automobile engine mount 10 according to the present embodiment, a pair of straight portions 46, 46 formed on the main rubber elastic body 16 are positioned in a direction perpendicular to the axis (in FIG. 6). , Left and right) is the vehicle front-rear direction, and the vehicle is mounted on the automobile so that the direction (vertical in FIG. 8) perpendicular to the 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, a relatively large pressure fluctuation is generated in the pressure receiving chamber 72 when vibrations in a low frequency region such as an engine shake which is a problem during traveling are input. Since this pressure is large, the movable rubber film 80 tuned to a small amplitude cannot substantially absorb the pressure in the pressure receiving chamber 72. Therefore, the flow amount of the fluid through the orifice passage 78 is effectively ensured by the difference in the relative pressure fluctuation generated between the pressure receiving chamber 72 and the equilibrium chamber 74, 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 72. At this time, since the frequency range of the vibration is higher than the tuning frequency of the orifice passage 78, the orifice passage 78 has a remarkably large fluid flow resistance due to an anti-resonant action, and is substantially closed. In view of this, a significant high dynamic spring resulting from the substantial blockage of the orifice passage 78 is absorbed by absorbing the pressure fluctuation of the pressure receiving chamber 72 based on the elastic deformation of the movable rubber film 80 tuned to the middle frequency range. 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.

  Therefore, in the automotive engine mount 10 according to the present embodiment, the tip end portion of the orifice cylinder portion 62 projecting from the lid portion 60 is overlapped with the inner peripheral edge portion of the step portion 24 of the second mounting bracket 14. In addition, a pressure receiving chamber 72 is formed on the inner peripheral side across the orifice cylinder portion 62, and an equilibrium chamber 74 is formed on the outer peripheral side. Further, the fixing portion of the second mounting bracket 14 to the main rubber elastic body 16 is a small diameter portion 26 positioned above the orifice cylinder portion 62. This eliminates the need for special consideration of tuning of the main rubber elastic body 16 when changing the design of the orifice cylinder part 62, the lid part 60, the large diameter part 28 of the second mounting bracket 14, and the like. The degree of freedom in designing the lid portion 60 and the large diameter portion 28 is increased.

  In addition, the assembly 58 provided with the orifice cylinder part 62 and the lid part 60 has a separate structure from the second mounting bracket 14, for example, to change the standard of the second mounting bracket 14. In addition, the design of the pressure receiving chamber 72, the equilibrium chamber 74, and the orifice passage 78 can be changed only by changing the design of the assembly 58.

  Further, since the orifice passage 78 is formed so as to extend in the circumferential direction using the space between the orifice cylindrical portion 62 and the large diameter portion 28 of the second mounting bracket 14, the design of the passage length and the cross section is made. The degree of freedom is increased.

  Furthermore, since the equilibrium chamber 74 is formed on the outer peripheral side of the pressure receiving chamber 72 with the orifice cylinder portion 62 sandwiched between them using the large diameter portion 28 of the second mounting bracket 14, the mount height can be kept low. However, the space for forming the equilibrium chamber 74 is effectively secured.

  Therefore, in the automotive engine mount 10 according to the present embodiment, the degree of freedom in tuning of the pressure receiving chamber 72, the equilibrium chamber 74, the orifice passage 78, and the like is improved while the downsizing is advantageously achieved, and the target vibration-proofing effect is achieved. Is obtained stably.

  In particular, in the present embodiment, since the lid portion 60 as the lid member and the orifice cylinder portion 62 as the orifice member have an integral structure, an increase in the number of parts can be suppressed, and the manufacturing process can be shortened and the cost can be reduced. This can be done advantageously.

  Further, when the projecting tip portion of the orifice tube portion 62 is fluid-tightly contacted with the inner peripheral edge portion of the step portion 24, the engagement rubber 68 of the orifice tube portion 62 is integrally formed with the main rubber elastic body 16. By adopting a locking structure in which the stopper rubber 50 is fitted, the orifice cylinder part 62 is stably assembled to the second mounting bracket 14 with a relatively simple structure, and the orifice cylinder part 62 and the step part 24 are assembled. Therefore, the fluid tightness of the pressure receiving chamber 72 and the equilibrium chamber 74 that are opposed to each other in the direction perpendicular to the axis across the orifice cylinder portion 62 can be further improved.

  Furthermore, in the present embodiment, the movable rubber film 80 constituting a part of the pressure fluctuation absorbing mechanism of the pressure receiving chamber 72 utilizes a part on the circumference of the locking rubber 50 that is integrally formed with the main rubber elastic body 16. Therefore, the work of forming the movable rubber film separately from the main rubber elastic body 16 and assembling it is omitted. Based on the reduction in the number of parts and manufacturing processes, further cost reduction and improvement in manufacturing efficiency are achieved. Can be achieved.

  Furthermore, in this embodiment, a plurality of opening windows 36 are formed apart from each other in the circumferential direction of the second mounting bracket 14, and the diaphragm 44 is fixed to the edge of each opening window 36. In 74, a plurality of diaphragms 44 are spaced apart in the circumferential direction. As a result, the pressure in the equilibrium chamber 74 is exerted on each diaphragm 44, so that the elastic deformation of each diaphragm 44 accompanying the pressure fluctuation in the equilibrium chamber 74 is reduced. As a result, the stress of the diaphragm 44 and contact with other members can be suppressed, and the durability of the diaphragm 44 can be improved.

  Further, in the automobile engine mount 10 of the present embodiment, the diaphragm 44 is located on the outer peripheral side of the small diameter portion 26 of the second mounting bracket 14 and between the axially facing surfaces of the bowl-shaped portion 30 and the large diameter portion 28. It is formed in a shape that bulges outward. Accordingly, the space between the bowl-shaped portion 30 and the large-diameter portion 28 can be skillfully utilized to ensure a large volume of the equilibrium chamber 74, and in addition, the diaphragm 44 can be positioned outside the axial direction. By being covered with the hook-shaped portion 30 and the large-diameter portion 28 from the side, there is an advantage that interference of foreign matter and other members to the diaphragm 44 is prevented, and damage to the diaphragm 44 is avoided.

  Next, FIGS. 9 and 10 show an automobile engine mount 90 as a second embodiment according to the fluid filled type vibration damping device of the present invention. In the following description, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and detailed descriptions thereof are given. Is omitted.

  Specifically, as shown in FIG. 11, three opening windows 36 formed from the stepped portion 24 to the large-diameter portion 28 of the second mounting bracket 14 according to the present embodiment are provided. These opening windows 36, 36, 36 are spaced apart at equal intervals in the circumferential direction of the second mounting bracket 14.

  Further, in the integrally vulcanized molded product 42 of the main rubber elastic body 16 provided with the first and second mounting brackets 12 and 14 according to the present embodiment, as shown in FIGS. The locking rubber 50 provided in the integrally vulcanized molded product 42 of the main rubber elastic body 16 according to the embodiment is not provided, and the step portion 24 and the large diameter portion 28 of the second mounting bracket 14 are not provided. A substantially rectangular cross section in which the seal rubber layer 40 deposited on the inner peripheral surface is also deposited on the inner peripheral edge of the stepped portion 24 and protrudes from the inner peripheral edge so as to spread flatly in the direction perpendicular to the axis. And continuously extending along the entire circumference.

  Furthermore, in this embodiment, the lid fitting 92 as a lid member and the orifice cylinder fitting 94 as an orifice member assembled to the integrally vulcanized molded product 42 of the main rubber elastic body 16 have separate structures.

  The lid fitting 92 has a large-diameter substantially disk shape, and a fixing bolt 64 is integrally formed at the central portion thereof and protrudes downward.

  On the other hand, as shown in FIGS. 14 and 15, the orifice tube fitting 94 has a substantially rectangular concave groove-shaped cross section that opens downward as a whole and has a cylindrical shape that extends continuously over the entire circumference. A large-diameter cylindrical outer peripheral wall 98 is provided at a predetermined distance outwardly in the radial direction of the small-diameter cylindrical inner peripheral wall 96, and an upper portion of the inner peripheral wall 96 and an upper end portion of the outer peripheral wall 98 are provided. The structure is such that they are connected to each other via an annular plate portion 100 having an annular shape that extends substantially flat in the direction perpendicular to the axis. As a result, the space defined by the inner peripheral wall 96, the outer peripheral wall 98 and the annular plate portion 100 inside the orifice cylindrical metal piece 94 has a substantially constant rectangular cross section that opens downward over the entire circumference in the circumferential direction. A circumferential groove 102 extending continuously is formed. In particular, in the present embodiment, the height of the inner peripheral wall 96 is larger than the height of the outer peripheral wall 98, the outer peripheral edge of the annular plate 100 is integrally formed with the upper end portion of the outer peripheral wall 98, and An inner peripheral edge portion of the annular plate portion 100 is integrally formed with a wall portion below the upper end portion of the inner peripheral wall 96. As a result, the upper end surface of the orifice tube fitting 94 extends in the circumferential direction with a substantially L-shaped cross section whose height dimension decreases radially outward.

  Further, a partition wall portion 104 that extends so as to straddle between the inner peripheral wall 96 and the outer peripheral wall 98 and divides the peripheral groove 102 is integrally formed at one place on the circumference of the orifice tube fitting 94. A communication hole 106 is formed through one inner circumferential wall 96 across the partition wall 104 and a communication hole 108 is formed through the other outer circumferential wall 98 across the partition wall 104. Yes.

  The lid fitting 92 and the orifice cylinder fitting 94 are fitted from the opening side on the other axial side (lower in FIG. 9) of the second mounting fitting 14 in the integrally vulcanized molded product 42 of the main rubber elastic body 16. The outer peripheral portion of the metal fitting 92 is fitted into the caulking portion 34 of the second attachment fitting 14, and in the axial direction with the opening end portion of the large-diameter portion 28 of the second attachment fitting 14 with the seal rubber layer 40 interposed therebetween. It is superimposed.

  Further, the upper end portion of the inner peripheral wall 96 of the orifice cylindrical metal fitting 94 is fitted into an annular sealing rubber layer 40 formed on the inner peripheral edge portion of the stepped portion 24 of the second mounting metal fitting 14 so as to sandwich the sealing rubber layer 40 therebetween. The inner peripheral edge portion is opposed to the inner peripheral edge portion in the radial direction. Further, the annular plate portion 100 of the orifice tube fitting 94 or the upper end portion of the outer peripheral wall 98 is overlapped in the axial direction with the inner peripheral edge portion of the stepped portion 24 with the seal rubber layer 40 interposed therebetween. Furthermore, the lower end portion of the orifice tube fitting 94 is overlapped in the axial direction with the radially intermediate portion of the lid fitting 92. As a result, the orifice tube fitting 94 is projected from the lid fitting 92 toward the inner peripheral edge portion of the step portion 24 of the second mounting fitting 14.

  In this manner, the caulking portion 34 of the second mounting bracket 14 is subjected to caulking processing in such a manner that the lid fitting 92 and the orifice cylindrical fitting 94 are fitted into the second mounting bracket 14.

  As a result, the lid fitting 92, the orifice cylinder fitting 94, and the second attachment fitting 14 are positioned on the substantially concentric shaft, and the lid fitting 92 is fixed to the second attachment fitting 14. Further, the sealing rubber layer 40 between the outer peripheral portion of the lid fitting 92 and the other opening edge in the axial direction of the second mounting fitting 14 (opening edge of the large diameter portion 28) is compressed and deformed in the axial direction, and the lid fitting Since the outer peripheral portion of 92 and the opening edge of the second mounting bracket 14 are overlapped in the axial direction, the other opening in the axial direction of the second mounting bracket 14 is covered with a lid fitting 92 in a fluid-tight manner. ing.

  Further, based on the caulking fixing force of the caulking portion 34, the orifice tube fitting 94 is clamped and fixed between the lid fitting 92 and the inner peripheral edge portion of the stepped portion 24 of the second mounting fitting 14. In particular, the seal rubber layer 40 between the upper end portion of the annular plate portion 100 or the inner peripheral wall 96 of the orifice tube fitting 94 and the inner peripheral portion of the step portion 24 is compressed and deformed in the axial direction, and the annular plate portion 100 or It is superposed on the upper end portion of the peripheral wall 96 in close contact, and is superposed on the inner peripheral wall 96 of the orifice tube fitting 94 by bulging deformation in the direction perpendicular to the axis accompanying axial compression deformation. As a result, the upper end portions of the inner and outer peripheral walls 96 and 98 and the annular plate portion 100 that are the protruding tip portions of the orifice tube fitting projecting from the lid fitting 92 are fluidized to the inner peripheral edge portion of the step portion 24 via the seal rubber layer 40. The inner peripheral space and the outer peripheral space sandwiching the orifice cylinder fitting 94 inside the second mounting fitting 14 are fluid-tightly partitioned by the orifice cylinder fitting 94 in close contact with each other. Further, the upper end portion of the inner peripheral wall 96 of the orifice cylindrical metal fitting 94 is fitted into the inner peripheral edge portion via the seal rubber layer 40 attached to the inner peripheral edge portion of the stepped portion 24, so that the orifice cylindrical metal fitting 94 and A locking mechanism that prevents the displacement of the second mounting bracket 14 in the direction perpendicular to the axis is configured.

  That is, in this embodiment, the orifice tube fitting 94 has substantially the same use and function as the orifice tube portion 62 of the assembly 58 according to the first embodiment, and the lid fitting 92 It has substantially the same application and function as the lid portion 60 of the assembly 58 according to the embodiment, and the inner space and the outer space sandwiching the orifice cylinder fitting 94 inside the second mounting fitting 14 are orifices. A pressure receiving chamber 72 is formed in a space defined by the inner peripheral wall 96 of the orifice tube fitting 94, the central portion of the lid fitting 92, and the large-diameter recess 38 of the main rubber elastic body 16. Has been.

  Further, the outer peripheral wall 98 of the orifice tube fitting 94 and the axially perpendicular facing surface of the second mounting bracket 14 between the axially facing surfaces of the stepped portion 24 of the second mounting bracket 14 and the radial intermediate portion of the lid fitting 92. An annular space in between is defined by the lid fitting 92, the outer peripheral wall 98, the step portion 24, the large diameter portion 28, and the three diaphragms 44, 44, 44, and the equilibrium chamber 110 is formed.

  Furthermore, based on the fact that the orifice cylinder fitting 94 is clamped and fixed between the inner peripheral edge portion of the stepped portion 24 of the second mounting fitting 14 and the axial direction of the lid fitting 92, the lower end portion of the orifice cylinder fitting 94 is the lid fitting. The opening portion of the circumferential groove 102 between the inner peripheral wall 96 and the outer peripheral wall 98 of the orifice tube fitting 94 is covered fluid-tightly with the lid fitting 92 so as to be fluid-tightly superimposed on the radial intermediate portion 92. . Thereby, an orifice passage 112 extending between the inner peripheral wall 96 and the outer peripheral wall 98 in the circumferential direction with a predetermined length (a little less than one round in the present embodiment) is formed, and one end portion of the orifice passage 112 in the circumferential direction is formed. The other end in the circumferential direction of the orifice passage 112 is connected to the pressure receiving chamber 72 through the communication hole 106 penetrating the inner peripheral wall 96, and the equilibrium chamber 110 is connected through the communication hole 108 penetrating the outer peripheral wall 98. It is connected to the. In other words, in the present embodiment, the pressure receiving chamber 72 and the equilibrium chamber 110 having an annular shape are communicated with each other by the orifice passage 112 extending in the circumferential direction in the orifice tube fitting 94.

  In the automotive engine mount 90 having the above-described structure, the tip end portion of the orifice cylinder fitting 94 protruding from the lid fitting 92 is overlapped with the inner peripheral edge portion of the step portion 24 of the second mounting fitting 14. In addition, the pressure receiving chamber 72 is formed on the inner side of the orifice tube fitting 94, and the equilibrium chamber 110 is formed on the outer peripheral side, so that the orifice tube fitting 94 and the lid are formed as in the first embodiment. When the design of the metal fitting 92, the large-diameter portion 28 of the second mounting metal 14, etc. is changed, it is not necessary to consider the tuning of the main rubber elastic body 16 in particular, and based on the fact that the degree of freedom in design is increased, The tuning performance of the chamber 72, the equilibrium chamber 110, and the orifice passage 112 can be advantageously improved.

  Moreover, since the orifice tube fitting 94 and the lid fitting 92 are separated from the second attachment fitting 14, the second attachment having a structure substantially similar to that of the first embodiment as in the present embodiment. Even when the metal fitting 14 is used, the orifice cylinder metal fitting can be removed from the assembly 58 including the lid 60 and the orifice cylinder 62 according to the first embodiment without greatly changing the design of the second attachment metal 14. The orifice passage 78 formed on the outer peripheral side of the orifice member (orifice tube portion 62) is changed to the orifice passage 112 formed inside the orifice member (orifice tube fitting 94) simply by changing to 94 or the lid fitting 92. Or an equilibrium chamber 74 formed in a region extending in a substantially semicircular arc shape on the outer peripheral side of the orifice member (orifice cylinder portion 62), an annular ring extending continuously over the entire circumference. It is readily made or change to Jo equilibrium chamber 110.

  In particular, in the present embodiment, since the orifice passage 112 is formed by utilizing the circumferential groove 102 in the orifice tube fitting 94, in addition to advantageously ensuring the circumferential length, the orifice passage 112 is formed in the orifice tube. Since it is not formed on the outer peripheral side of the metal fitting 94, the space of the equilibrium chamber 110 formed on the outer peripheral side is advantageously secured, and the annular-shaped equilibrium chamber 110 having a large volume as illustrated can be realized. is there.

  Moreover, in this embodiment, the three opening windows 36, 36, 36 are formed at equal intervals in the circumferential direction of the second mounting bracket 14, and the three diaphragms 44 filled with the incompressible fluid are equal in the circumferential direction. By being provided at intervals, the weight balance in the circumferential direction of the equilibrium chamber 110 can be stabilized, and the stability of the mounted state can be improved.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific descriptions in these embodiments, and various changes, modifications, and improvements based on the knowledge of those skilled in the art. Needless to say, any of these embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, the shape, size, structure, number, arrangement, etc. of the orifice member, lid member, small diameter portion, large diameter portion, stepped portion, pressure receiving chamber, equilibrium chamber, orifice passage, etc. are limited to those illustrated. For example, two or more orifice passages may be formed in the orifice member, and the orifice passages may be tuned to different frequency ranges.

  In the above-described embodiment, the fixing bolt protrudes from the lid member, and the second mounting bracket is attached to the vehicle body via the lid member. Instead of or in addition to the bolt, a bracket fitting (not shown) may be provided on the second fitting, and the second fitting may be attached to the vehicle body via the bracket fitting.

  Furthermore, the stopper mechanism according to the embodiment is assembled to an integrally vulcanized molded product of the main rubber elastic body as necessary, and is not an essential constituent element.

  In the above-described embodiment, the first contact portion constituting a part of the stopper mechanism is integrally formed with the first mounting bracket, and the buffer rubber layer integrally formed with the main rubber elastic body is the first contact. The first abutting portion and the buffer rubber layer were integrally formed on the integrally vulcanized molded product of the main rubber elastic body by being attached to the portion. For example, the buffer rubber layer was provided. A separate structure may be employed in which the first contact portion is formed separately from the integrally vulcanized molded product and is fixed to the first mounting bracket of the integrally vulcanized molded product.

  Further, the stopper fitting formed separately from the second mounting bracket in the above embodiment is integrally formed with the second mounting bracket, and after the integral vulcanization molded product of the main rubber elastic body is formed, the stopper It is also possible to configure the second contact portion by bending the tip end portion of the metal fitting to the inner peripheral side so as to be opposed to the first contact portion in the axial direction.

  Furthermore, in the above embodiment, when the lid member is fixed to the second mounting bracket, the outer peripheral portion of the lid member is fitted into the caulking portion of the second mounting bracket, and the caulking portion is subjected to caulking processing. For example, without providing a caulking portion, a flange-like portion is provided at the opening end of the second mounting bracket, and the outer peripheral portion of the lid member and the flange-like portion are overlapped to weld or bolt You may make it fix with etc.

  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 1st embodiment of this invention. II-II sectional drawing of FIG. The longitudinal cross-sectional view of the 2nd attachment metal fitting which comprises a part of engine mount for the vehicles. The bottom view of the second mounting bracket. It is a longitudinal cross-sectional view of the integral vulcanization molded product of the main rubber elastic body provided with the first and second mounting brackets constituting a part of the engine mount for the automobile, and corresponds to the VV cross section of FIG. Figure. The bottom view of the integral vulcanization molding product of the main body rubber elastic body. It is a longitudinal cross-sectional view of the assembly which comprises a part of engine mount for the motor vehicles, Comprising: The figure corresponded in the VII-VII cross section of FIG. The top view of the assembly | attachment body. The longitudinal cross-sectional view of the engine mount for motor vehicles as 2nd embodiment of this invention. XX sectional drawing of FIG. The bottom view of the 2nd attachment metal fitting which comprises a part of engine mount for the vehicles. FIG. 14 is a longitudinal sectional view of an integrally vulcanized molded product of a main rubber elastic body provided with first and second mounting brackets constituting a part of the engine mount for the automobile, and corresponds to a cross section taken along line XII-XII in FIG. 13. Figure. The bottom view of the integral vulcanization molding product of the main body rubber elastic body. The longitudinal cross-sectional view of the orifice cylinder metal fitting which comprises a part of engine mount for the vehicles. The cross-sectional view of the same orifice cylinder fitting.

Explanation of symbols

10: Engine mount for automobile, 12: First mounting bracket, 14: Second mounting bracket, 16: Rubber elastic body of main body, 24: Stepped portion, 26: Small diameter portion, 28: Large diameter portion, 36: Opening window 44: Diaphragm, 60: Lid, 62: Orifice cylinder, 72: Pressure receiving chamber, 74: Equilibrium chamber, 78: Orifice passage

Claims (6)

The first mounting member is spaced apart on the one opening side in the axial direction of the second mounting member having a cylindrical shape, and the first mounting member and the second mounting member are connected by the main rubber elastic body. In addition, a lid member is disposed on the other opening side in the axial direction of the second mounting member to fluidly close the other opening in the axial direction, and a part of the wall portion is made of the main rubber elastic body. The formed pressure receiving chamber and the equilibrium chamber in which a part of the wall portion is formed of a flexible rubber film are formed, and incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber. In a fluid-filled vibration isolator that forms orifice passages that communicate with each other,
The second mounting member is formed with a stepped cylindrical shape in which one axial direction is a small diameter portion and the other axial direction is a large diameter portion with a stepped portion extending in a direction perpendicular to the axis, and the small diameter side The main rubber elastic body is fixed to the peripheral edge of the opening, and the opening on the large-diameter portion side is covered with the lid member, and the opening window extends from the stepped portion to the large-diameter portion. And the opening window is closed by the flexible rubber film integrally formed with the main rubber elastic body, and an orifice member having an annular shape is formed from the lid member to the second mounting member. Projecting toward the stepped portion, the projecting tip portion of the orifice member is in fluid tight contact with the inner peripheral edge portion of the stepped portion, so that the pressure receiving member is placed on the inner peripheral side of the orifice member. A chamber is formed and the flat surface is formed on the outer peripheral side of the orifice member. With the chamber is formed, the fluid filled type vibration damping device, characterized in that said orifice passage is formed so as to extend in the circumferential direction.   A locking groove extending in the circumferential direction is formed in the protruding tip portion of the orifice member, and a locking corresponding to the shape of the locking groove is formed in the inner peripheral edge portion of the stepped portion of the second mounting member. The fluid-filled vibration isolator according to claim 1, wherein a protrusion is provided, and the locking protrusion is fitted and fixed in the locking groove.   A through hole is formed in the projecting tip portion of the orifice member so as to penetrate the locking groove in the width direction and connect the pressure receiving chamber and the equilibrium chamber to each other, and in the inner peripheral edge portion of the small diameter portion At least a part of the locking protrusion is formed of a movable rubber film integrally formed with the main rubber elastic body, and the movable rubber film is fitted into the locking groove to cover the through hole in a fluid-tight manner. The pressure fluctuation absorbing mechanism is configured such that the pressure of the pressure receiving chamber is exerted on one surface of the movable rubber film and the pressure of the equilibrium chamber is exerted on the other surface of the movable rubber film. 2. The fluid-filled vibration isolator according to 2.   The orifice 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 end portion of the orifice member is overlapped in close contact with the lid member to form an inner peripheral wall of the orifice member The orifice passage is formed so as to extend in the circumferential direction in the groove portion of the orifice member by covering the opening portion of the groove portion between the outer peripheral walls fluid-tightly with the lid member. 4. The fluid-filled vibration isolator according to any one of 3 above.   The first mounting member is provided with a first abutting portion that extends in a direction perpendicular to the axis, and an outer flange-shaped flange portion is integrally formed at one opening end portion in the axial direction of the second mounting member. A cylindrical stopper member extending in the axial direction outside the first abutting portion is fixed to the outer peripheral portion of the flange-shaped portion, and the tip end portion of the stopper member is bent toward the inner peripheral side. The second abutting portion is configured to be opposed to the first abutting portion so as to be spaced outward in the axial direction. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein a stopper mechanism in a rebound direction is configured.   The hook-shaped portions provided on the second mounting member protrude outward in the direction perpendicular to the axis from the flexible rubber film closing the opening window of the second mounting member. 6. The fluid-filled vibration isolator according to claim 5, wherein the hook-shaped portion and the flexible rubber film are opposed to each other in the axial direction.

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