JP2009085252A - Fluid sealed type vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealed type vibration damper equipped with a liquid pressure absorbing mechanism of a novel structure capable of preventing abnormal noise in excess vibration load input while suitably securing an effective area of a movable rubber membrane without increase of a new component or a manufacturing process, and securing excellent durability. <P>SOLUTION: An outer peripheral edge of the movable rubber membrane 82 is protruded on both surfaces along an entire periphery, and an annular thick pinching part 86 is integrally formed, and a haunch-shaped corner-thickened part 106 extended from the thick pinching part 86 to a thin part 84 is integrally formed in a plurality of peripheral portions in a boundary part between the thick pinching part 86 on the both surfaces of the movable rubber membrane 82 and the thin part 84 in an inner peripheral side thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluid-filled vibration isolator that obtains a vibration isolation effect based on the flow action of an incompressible fluid enclosed in an internal fluid chamber, and in particular, a hydraulic pressure that absorbs pressure fluctuations in the fluid chamber. The present invention relates to a fluid-filled vibration isolator having an absorption mechanism.

  Conventionally, as a type of vibration isolator such as an anti-vibration coupling body and an anti-vibration support body interposed between members constituting a vibration transmission system, an anti-vibration effect is obtained based on the flow action of an incompressible fluid. There has been known a fluid-filled vibration isolator. In this fluid-filled vibration isolator, the first mounting member and the second mounting member are connected by the main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body to enclose the incompressible fluid. The pressure receiving chamber is formed with an equilibrium chamber in which a part of the wall portion is made of a flexible membrane that is easily deformed and in which an incompressible fluid is sealed, and the two chambers communicate with each other through an orifice passage. It is said that. According to such a structure, a relative pressure fluctuation occurs between the pressure receiving chamber and the equilibrium chamber due to vibration input, and a vibration isolation effect is obtained based on a fluid action such as a resonance action of the fluid that flows through the orifice passage. It is done. Such a fluid-filled vibration isolator has been studied for application to, for example, an automobile engine mount, body mount, and differential mount as well as a suspension member mount.

  However, the vibration-proof effect by the orifice passage is effectively exhibited only in a relatively narrow frequency range in which the orifice passage is tuned in advance. Therefore, when vibration in a frequency range higher than the resonance frequency of the orifice passage is input, a sufficient vibration isolation effect can be obtained due to the difficulty of effectively exerting the fluid flow action through the orifice passage. There was a difficult problem.

  Therefore, in recent years, a fluid-filled vibration isolator having a hydraulic pressure absorbing mechanism has been developed and studied. This hydraulic pressure absorbing mechanism generally has a thick annular support portion formed on the outer peripheral edge of a movable rubber film made of a rubber elastic material, and the annular support portion is sandwiched between a support member fixed to a second mounting member. By supporting the pressure, a movable rubber film is disposed between the pressure receiving chamber and the equilibrium chamber so 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. Thus, the movable rubber film is deformed by the relative pressure difference between the pressure receiving chamber and the equilibrium chamber to absorb pressure fluctuations in the pressure receiving chamber. As a result, when a problem vibration is input in a frequency range higher than the tuning frequency of the orifice passage, the pressure fluctuation in the pressure receiving chamber is absorbed by the elastic deformation of the movable rubber film, and the high dynamic spring is avoided. Therefore, stabilization of the vibration proofing effect is achieved.

  However, when the present inventors examined such a hydraulic pressure absorption mechanism using a movable rubber film, it became clear that there was a new problem. That is, it was recognized that abnormal noise was generated when a shocking large vibration load was input to the fluid-filled vibration isolator having such a hydraulic pressure absorbing mechanism.

  Although it was not easy to understand what caused the abnormal noise, the inventor cut and disassembled the anti-vibration device in which the abnormal noise occurred, and as a result, the annular support portion of the movable rubber film As a result, it has been found that a stick-slip sound generated due to tilting or the like with respect to the support member is likely to be generated. That is, when an excessive pressure fluctuation is induced in the pressure receiving chamber due to an input of a shocking large vibration load, a large deformation occurs in the movable rubber film, which is a diameter relative to the annular support portion at the outer peripheral edge. The annular support portion tilts by acting as a tensile force inwardly in the direction. As a result, it has been found that the occurrence of slip between the annular support portion and the support member sandwiching the annular support portion may be a cause of generation of stick-slip noise that is an abnormal noise.

  As a measure for preventing tilt slip with respect to the support member in the annular support portion of the movable rubber film, for example, (i) increasing the volume of the annular support portion to improve the rigidity, (ii) Patent Document 1 (Japanese Patent Laid-Open No. 09). (Iii) Patent Document 2 (Japanese Patent Laid-Open No. 2006-258184), as shown in Japanese Patent No. -310732), preventing the annular support portion from tilting by sandwiching the inner peripheral surface of the annular support portion between the support members. As shown in Japanese Patent Laid-Open Publication No. H11-209, it is conceivable to vulcanize and bond an annular fitting to the outer peripheral surface of the movable rubber film, and press-fit and fix the annular fitting to the support member.

  However, in the fluid-filled vibration isolators (i) and (ii), there is a problem that the effective area of the movable rubber film is reduced and the intended hydraulic pressure absorption performance and thus the vibration isolation performance is lowered. . Further, in the fluid-filled vibration isolator of (iii) above, a separate annular fitting is required, which not only increases the number of parts, but also the vulcanization bonding step and the vulcanized annular fitting. There is a problem that a special manufacturing process such as drawing is required. In addition, in any of the fluid-filled vibration isolators in (i), (ii), and (iii), as the fixing strength of the annular support portion increases, the thin portion of the movable rubber film and the annular support portion As a result, the stress concentration on the boundary portion increases and cracks and the like easily occur, and the durability of the movable rubber film may be reduced.

Japanese Patent Laid-Open No. 09-310732 JP 2006-258184 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that a sufficient area of the movable rubber film is ensured while a new part or manufacturing process is performed. A fluid-filled type anti-hydraulic system equipped with a new structure that can prevent the generation of abnormal noise when an excessive vibration load is input, while ensuring excellent durability. It is to provide a vibration device.

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

  That is, the present invention is characterized in that the first mounting member and the second mounting member are connected by the main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body so that the incompressible fluid is formed. And a pressure-receiving chamber in which a part of the wall portion is formed by a flexible membrane to form an incompressible fluid, and the pressure-receiving chamber and the equilibrium chamber communicate with each other by an orifice passage. In addition, a movable rubber film is disposed between the pressure receiving chamber and the equilibrium chamber so that the pressure of the pressure receiving chamber is exerted on one surface of the movable rubber film and the equilibrium chamber is disposed on the other surface of the movable rubber film. In a fluid-filled vibration isolator that constitutes a hydraulic pressure absorption mechanism that absorbs minute pressure fluctuations in the pressure receiving chamber by applying pressure, the outer peripheral edge of the movable rubber film protrudes on both sides over the entire circumference To form the annular thick-wall clamping part integrally, and the second mounting part A state in which elastic deformation is allowed in the thin portion on the inner peripheral side of the thick sandwiching portion by sandwiching and supporting the thick sandwiching portion from both sides in the thickness direction by the support member fixedly provided with respect to The movable rubber film is disposed at the boundary between the thick sandwiched portion on both sides of the movable rubber film and the thin portion on the inner periphery side, and the thick sandwiched portion is directed from the thick sandwiched portion to the thin portion at a plurality of locations on the circumference. The fluid-filled vibration isolator is integrally formed with a hunched corner fillet portion that extends in the form of a part.

  In the fluid-filled vibration isolator having the structure according to the present invention, the corner wall portion is formed at the boundary portion that becomes the connection portion between the thick sandwich portion and the thin portion, so that the boundary portion Rigidity is improved on the basis of the thickening, and as a result, the holding pressure holding force by the support member of the thick holding portion is increased. As a result, the thick sandwiched portion is firmly held by the support member, and the tilting of the thick sandwiched portion with respect to the support member is suppressed, and the stick-slip sound that is considered to be caused by the tilt of the thick sandwiched portion, etc. Noise is suppressed.

  In particular, since a plurality of corner beveled portions are formed in a divided state on the periphery of the movable rubber film, an effective free length of the movable rubber film is provided in a portion of the movable rubber film where the corner beveled portions are not formed. However, the length is close to the length in which the corner portion is not formed, and is secured largely. Therefore, the effect of preventing the tilting of the thick sandwiched portion by the cornered portion is achieved without significantly reducing the fluid pressure absorbing function of the movable rubber film, and the desired vibration-proof performance is also exhibited effectively. Can be done.

  Furthermore, a plurality of corner-filled portions are formed in a divided state on the periphery of the boundary portion between the thick sandwiched portion and the thin portion in the movable rubber film, so that the boundary portion is zigzag on the periphery. . As a result, the perimeter of the boundary portion according to the present invention is made larger than the perimeter of the boundary portion that extends with a constant diameter over the entire circumference. As a result, the stress acting on the boundary portion is dispersed and reduced, the generation of cracks is suppressed, and the durability can be improved.

  In addition, the corner wall portion is formed into a haunch shape having a substantially triangular cross section, the height dimension of which gradually decreases from the thick sandwich portion toward the thin portion, thereby forming the corner wall portion. Even in itself, the dispersion of stress can be reduced. Therefore, the durability of the movable rubber film provided with the cornered portion is improved, and the reliability of preventing stick-slip noise is increased.

  In the present invention, it is desirable that the outer peripheral surface of the thick sandwiching portion is also in close contact with the support member in the radial direction while the thick sandwiching portion of the movable rubber film is sandwiched and supported by the support member. . More preferably, it is effective that the supporting member is in contact with the outer peripheral surface of the thick sandwiching portion in a radial direction with a predetermined pressing force. A large holding force is applied. Further, in the present invention, the haunch shape is a thick-walled sandwiching portion in which the cross section in the height direction extending in the axial direction of the movable rubber film has a large height dimension at the boundary portion that becomes the connecting portion between the thick-walled sandwiching portion and the thin-walled portion. The form which is exhibiting the triangular shape from which a height dimension becomes small toward the thin part side from the side is said.

  Moreover, in the fluid-filled vibration isolator according to the present invention, a structure in which the corner portions are formed at the same position on both surfaces of the movable rubber film may be employed. According to such a structure, a large rubber volume in the height direction is ensured at the portion where the corner portion is formed in the movable rubber film. Therefore, the force that suppresses the tilting of the thick sandwiching portion is further increased, and the stick-slip noise resulting from the tilting is more effectively reduced. In particular, since the corner-filled portions having the same shape, size, and the like are provided on both surfaces of the movable rubber film, the burden of distinguishing both surfaces of the movable rubber film is reduced. Assembling work becomes easier.

  In the fluid-filled vibration isolator according to the present invention, a structure in which three or more corner portions are formed at equal intervals on the periphery of the movable rubber film may be employed. According to such a structure, the local deformation is suppressed in the plurality of corner wall portions, so that a decrease in the durability performance due to the stress concentration is reduced, and the tilt prevention effect of the thick sandwich portion is reduced. It is efficiently exhibited over the entire circumferential direction.

  Further, in the fluid filled type vibration damping device according to the present invention, a partition member that is fixedly supported by the second mounting member and partitions the pressure receiving chamber and the equilibrium chamber is provided, and is movable at a central portion of the partition member. A structure in which the rubber film is disposed and the support member is configured by the partition member while the orifice passage is formed in the outer peripheral portion of the partition member may be employed. According to such a structure, since the support member that supports the movable rubber film is configured by using the partition member that partitions the pressure receiving chamber and the equilibrium chamber, the number of parts and the manufacturing process can be reduced. A lower cost can be achieved. Further, the orifice passage is formed in the outer peripheral portion of the partition member, and the internal structure of the vibration isolator is made compact, so that the size can be reduced.

  Further, in the fluid filled type vibration isolator according to the present invention, the elastic protrusions protruding to the both sides in the thickness direction are integrally formed in the central portion of the movable rubber film, and are fixedly provided to the second mounting member. A structure in which the elastic deformation at the central portion of the movable rubber film is restricted by the elastic protrusion coming into contact with the contact member formed may be employed. According to such a structure, the elastic deformation in the central portion of the thin portion where the elastic protrusion is formed in the movable rubber film and the elastic deformation in the outer peripheral portion of the thin portion where the thick sandwiching portion is formed are the contact member. And the support member. As a result, an intermediate portion having a large effective area between the central portion and the outer peripheral edge portion of the thin wall portion is stably supported by the second mounting member via the contact member or the support member. Therefore, the pressure variation of the pressure receiving chamber is efficiently absorbed by the elastic deformation of the intermediate portion of the thin wall portion, and the hydraulic pressure absorption effect of the pressure receiving chamber can be obtained more effectively. In addition, since the central portion of the movable rubber film is in contact with the contact member via the elastic protrusion, the impact of the movable rubber film and the contact member is based on the buffering action by the elasticity of the elastic protrusion. The hitting sound associated with the hit can be reduced.

  Further, in the fluid filled type vibration damping device according to the present invention, the elastic protrusion is formed with a relief hole extending through both sides of the movable rubber film, and the inside of the relief hole is an equilibrium chamber. On the other hand, a structure in which the contact member is overlapped with and covered with the opening end surface toward the pressure receiving chamber in the relief hole may be employed while being always in communication. According to such a structure, when a shocking or heavy load vibration is input and an excessive negative pressure is generated in the pressure receiving chamber, the contact member is moved by the negative pressure to the relief hole. By separating from the opening end face and opening the relief hole, the pressure receiving chamber and the equilibrium chamber can be short-circuited through the relief hole. As a result, the pressure in the pressure receiving chamber and the pressure in the equilibrium chamber are brought into an equilibrium state, so the overnegative pressure state in the pressure receiving chamber is eliminated, and the cavitation bubbles caused by separation of dissolved air in the pressure receiving chamber due to the overnegative pressure state are eliminated. Occurrence is suppressed. Therefore, the occurrence of shocking abnormal noise and vibration caused by the water hammer pressure propagating to the vibration isolation target member via the first mounting member and the second mounting member with the collapse of the cavitation bubbles can be suppressed. It is.

  Here, in the fluid-filled vibration isolator in which the elastic protrusion is formed at the central portion of the movable rubber film, the elastic deformation of the central portion of the thin portion of the movable rubber film is limited by the elastic protrusion. As a result, the effective free length of the thin portion is reduced. Therefore, the tensile strain or shear strain required by “elongation deformation amount / length” or “shear deformation amount / length” is increased, and as a result, it is exerted in an oblique direction with respect to the thick sandwich portion to sandwich the thick portion. There is a possibility that the force for tilting the portion is further increased.

  Therefore, in the fluid-filled vibration isolator according to the present invention, the corner wall portion is formed at the boundary portion between the thin portion and the thick sandwich portion, and the rigidity of the thick sandwich portion is increased, Since the tilting of the thick sandwiching portion can be suppressed, it can be suitably used particularly for a fluid-filled vibration isolator in which an elastic protrusion is formed at the central portion of the movable rubber film as described above.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIG. 1 shows an automobile engine mount 10 as an embodiment according to the fluid filled type vibration damping device 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 an anti-vibration manner with respect to the vehicle 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 substantially cylindrical shape or a truncated cone shape, and a screw hole 18 that opens to the upper end surface is provided in the center portion thereof. The first mounting bracket 12 is screwed and fixed to a power unit side mounting member (not shown) through a screw hole 18.

  On the other hand, the second mounting bracket 14 has a large-diameter substantially cylindrical shape, and an inner flange-shaped step portion 20 is formed at an axially intermediate portion thereof, and from the inner peripheral edge portion of the step portion 20. A tapered portion 22 having a diameter that gradually decreases from the upper side to the lower side is formed at the upward portion. The second mounting bracket 14 is fixed to a mounting member on the vehicle body side via a bracket member (not shown).

  The first mounting bracket 12 is spaced apart from the opening of the second mounting bracket 14 having the tapered portion 22 so that the central axes of both the brackets 12 and 14 are positioned substantially on the same line. Yes. 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 frustoconical shape, and a large-diameter recess 24 having an inverted mortar shape or a hemispherical shape that opens downward is provided on an end surface on the large-diameter side. The small-diameter side end face of the main rubber elastic body 16 is vulcanized and bonded in a state where substantially the entire portion from the axially intermediate portion to the lower end portion of the first mounting member 12 is embedded. The inner peripheral surface of the tapered portion 22 of the second mounting bracket 14 is 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. Further, a thin seal rubber layer 26 integrally formed with the main rubber elastic body 16 is formed so as to cover substantially the entire inner peripheral surface from the step portion 20 to the lower end portion of the second mounting bracket 14. In other words, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14, whereby the first mounting bracket 12 and the second mounting bracket 12 are attached. The metal fittings 14 are elastically connected to each other by the main rubber elastic body 16, and the opening above the second mounting metal fitting 14 is fluid-tightly closed by the main rubber elastic body 16.

  A diaphragm 28 as a flexible film is provided in the opening below the second mounting bracket 14. The diaphragm 28 is made of a thin rubber film that can be easily deformed, and has a substantially disk shape that is slackened in the axial direction. A large-diameter cylindrical fixing ring 30 is vulcanized and bonded to the outer peripheral edge of the diaphragm 28, and the fixing ring 30 is fitted into the opening below the second mounting bracket 14, so that the second mounting Since the metal fitting 14 is subjected to diameter reduction processing such as an eight-way drawing, the fixing ring 30 is fitted and fixed to the second mounting metal fitting 14 via a seal rubber layer 26 that is compressed and deformed in the radial direction.

  As a result, the diaphragm 28 is fixed to the second mounting bracket 14, the lower opening of the second mounting bracket 14 is fluid-tightly covered with the diaphragm 28, and at the inside of the second mounting bracket 14. Between the main rubber elastic body 16 and the diaphragm 28 facing each other in the axial direction, a fluid sealing region 32 sealed with respect to the external space is formed.

  In the fluid sealing region 32, a partition member 34 as a support member fixed to the second mounting bracket 14 is disposed. 2 to 4, the partition member 34 has a circular block shape as a whole, and is formed using a hard material such as a metal material or a synthetic resin material. The partition member 34 includes a partition member main body 36 and a lid member 38.

  The partition member main body 36 has a circular block shape. An upper recess 40 that opens from the axial middle portion of the partition member body 36 to the upper end surface and a lower recess 42 that opens to the lower end surface are formed in the central portion in the radial direction of the partition member body 36. These recesses 40 and 42 both extend in the axial direction with a substantially constant circular cross section. Moreover, the bottom wall part of both the recesses 40 and 42 cooperates with the axial direction intermediate part of the partition member main body 36, and the circular bottom part 44 of a thin disk shape is comprised.

  A substantially circular communication hole 46 is formed in the central portion in the radial direction of the circular bottom portion 44 so as to penetrate in the thickness direction (up and down in FIG. 1) extending in the mount axis direction. Further, a through hole 48 is provided around the communication hole 46 in the circular bottom portion 44 at a predetermined distance in the radial direction. The through-hole 48 is configured to include a substantially small fan-shaped first small hole 50 and a second small hole 52 whose width dimension gradually increases from the radially inner side toward the outer side. The first small hole 50 and the second small hole 52 are different from each other in the ratio of the width dimension in the circumferential direction to the width dimension in the radial direction. A plurality are provided at equal intervals in the direction.

  In addition, circumferential grooves 54 that spirally extend in the circumferential direction are formed in the outer peripheral portion of the partition member main body 36, and both end portions of the peripheral groove 54 are formed at the upper end portion and the lower end portion of the partition member main body 36, respectively. It is connected to each communication window 56, 58 in the shape of a notch. A plurality (three in this embodiment) of engaging protrusions 60 are provided protruding from the upper end portion of the partition member main body 36 around the upper recess 40 in the circumferential direction.

  On the other hand, the lid member 38 has a thin disk shape, and the outer diameter of the lid member 38 is substantially the same as the outer diameter of the partition member main body 36. Here, a substantially circular communication hole 62 is formed in the central portion in the radial direction of the lid member 38 so as to penetrate in the thickness direction. The diameter of the communication hole 62 is substantially the same as the diameter of the communication hole 46 of the circular bottom 44 of the partition member main body 36. Further, a through hole 64 is provided on the outer peripheral side of the communication hole 62 in the lid member 38. The through hole 64 includes a first small hole 66 and a second small hole 68 having the same form as the first small hole 50 and the second small hole 52 in the through hole 48 formed in the partition member main body 36. A plurality of first small holes 66 are provided at equal intervals in the circumferential direction at the radial intermediate portion of the lid member 38, and the second small holes 68 are circumferentially equal at the radially outer peripheral portion of the lid member 38. It is provided at intervals. A cutout communication window 70 is formed on the outer peripheral edge of the lid member 38. Furthermore, a plurality of (three in this embodiment) locking holes 72 are provided in the outer peripheral portion of the lid member 38 so as to be spaced apart from each other in the circumferential direction.

  The lid member 38 is superimposed on the upper end portion of the partition member main body 36, and the locking protrusions 60 of the partition member main body 36 are inserted into the locking holes 72 of the lid member 38, so that It is locked in the axial direction. As a result, the partition member main body 36 and the lid member 38 are assembled to each other while being positioned in the circumferential direction to constitute the partition member 34. In addition, the opening of the upper recess 40 of the partition member main body 36 is covered with the lid member 38, so that the gap between the lid member 38 inside the upper recess 40 and the axially opposed surface of the circular bottom 44 of the partition member main body 36. Is provided with a housing region 74 defined by the peripheral wall portion of the upper recess 40, the lid member 38, and the circular bottom portion 44. That is, the accommodation region 74 extends with a substantially constant circular cross section in the axial direction inside the radial center portion of the partition member 34. In particular, in the present embodiment, the partition member body 36 and the lid member 38 are aligned in the circumferential direction and are coaxially arranged, so that the through holes 48 and the lid member 38 of the circular bottom 44 in the partition member body 36 are arranged. The through hole 64, the communication hole 46 of the circular bottom 44, and the communication hole 62 of the lid member 38 are arranged at positions that are projected in the axial direction. Further, the communication window 56 of the partition member main body 36 and the communication window 70 of the lid member 38 are overlapped in the axial direction.

  Prior to the assembly of the diaphragm 28 to the second mounting bracket 14, the partition member 34 is fitted in the axial direction from the opening below the second mounting bracket 14, and the lid member 38 of the partition member 34. The outer peripheral portion of the second mounting bracket 14 is superposed on the step portion 20 of the second mounting bracket 14 with a seal rubber layer 26 interposed therebetween. A fixing ring 30 of a diaphragm 28 fitted in the second mounting bracket 14 is overlaid on the lower end portion of the partition member main body 36 of the partition member 34. Then, the outer diameter of the partition member main body 36 and the outer diameter of the lid member 38 are obtained by reducing the diameter of the second mounting bracket 14 by reducing the diameter of the second mounting bracket 14 by reducing the diameter of the second mounting bracket 14. Is superimposed on the inner peripheral surface of the second mounting bracket 14 via a seal rubber layer 26 that is compressed and deformed in the direction perpendicular to the axis, and the tensile deformation in the axial direction accompanying the compression deformation in the direction perpendicular to the axis of the seal rubber layer 26 The outer peripheral portion of the partition member 34 is clamped and fixed between the step portion 20 of the second mounting bracket 14 and the fixing ring 30 of the diaphragm 28. Further, the sealing rubber layer 26 attached to the stepped portion 20 is interposed between the outer peripheral portion of the lid member 38 and the overlapping surface of the stepped portion 20 while being compressed and deformed in the axial direction. The outer peripheral portion and the stepped portion 20 are fluid-tightly overlapped.

  Thereby, the partition member 34 is fixedly supported by the second mounting bracket 14, and the fluid sealing region 32 inside the second mounting bracket 14 is divided into two fluid-tightly. On one side (upper side in FIG. 1) of the fluid sealing region 32 with the partition member 34 interposed therebetween, a part of the wall portion is constituted by the main rubber elastic body 16, and based on the elastic deformation of the main rubber elastic body 16. A pressure receiving chamber 76 in which pressure fluctuation is generated is formed. Further, on the other side (lower side in FIG. 1) of the fluid sealing region 32 with the partition member 34 interposed therebetween, a part of the wall portion is constituted by the diaphragm 28, and the volume change is easy based on the elastic deformation of the diaphragm 28. An equilibration chamber 78 is formed. An incompressible fluid is sealed in the pressure receiving chamber 76 and the equilibrium chamber 78. 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. The incompressible fluid is sealed in the pressure receiving chamber 76 or the equilibrium chamber 78, for example, the partition member 34 or the diaphragm for the integrally vulcanized molded product of the main rubber elastic body 16 including the first and second mounting brackets 12 and 14. It is preferably realized by performing the assembly of 28 in an incompressible fluid.

  Further, the circumferential groove 54 of the partition member main body 36 is fluid-tightly covered with the second mounting bracket 14, so that an orifice passage 80 extending spirally around the outer peripheral portion of the partition member 34 with a predetermined length in the circumferential direction. Is formed. One end of the orifice passage 80 is connected to the pressure receiving chamber 76 through the communication window 56 of the partition member main body 36, the communication window 70 of the lid member 38, and the like, and the other end of the orifice passage 80 is connected to the partition. The member body 36 is connected to the equilibrium chamber 78 through the communication window 58. Thus, the pressure receiving chamber 76 and the equilibrium chamber 78 are communicated with each other through the orifice passage 80, and fluid flow through the orifice passage 80 is allowed between the chambers 76 and 78.

  In the present embodiment, the resonance frequency of the fluid that flows through the orifice passage 80 is effective against vibrations in a low frequency region around 10 Hz corresponding to an engine shake or the like (high vibration effect) based on the resonance action of the fluid. It is tuned so that the damping effect is demonstrated. Tuning of the orifice passage 80 is performed by, for example, the rigidity of the wall springs of the pressure receiving chamber 76 and the equilibrium chamber 78, that is, the main rubber elastic body 16 corresponding to the amount of pressure change required to change the chambers 76 and 78 by a unit volume. It is possible to adjust the length and cross-sectional area of the orifice passage 80 in consideration of the characteristic values based on the respective elastic deformation amounts of the diaphragm 28 and the diaphragm 28. Generally, the pressure transmitted through the orifice passage 80 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 80.

  The accommodation region 74 formed in the partition member 34 communicates with the pressure receiving chamber 76 through the through hole 62 and the communication hole 64 of the lid member 38 and is balanced through the through hole 48 and the communication hole 46 of the partition member main body 36. It communicates with the chamber 78. In addition, the storage area 74 is formed by the cover member 38 being overlapped and fixed to the upper end portion of the partition member main body 36 before the partition member 34 is fixed to the second mounting bracket 14. It may be formed, or when the partition member 34 is attached to the second mounting member 14, a pinching action exerted between the step 20 of the second mounting member 14 and the axial direction of the fixing ring 30 of the diaphragm 28. The lid member 38 may be formed by being closely adhered to the upper end portion of the partition member main body 36 using the above.

  A rubber elastic film 82 as a movable rubber film is accommodated in the accommodation area 74 of the partition member 34. As shown in FIGS. 5 and 6, the rubber elastic film 82 is made of a rubber elastic material and has a substantially disk shape as a whole. The rubber elastic film 82 includes a flat plate portion 84 as a thin portion and a peripheral protrusion 86 as a thick sandwich portion.

  The flat plate-like portion 84 has a thin and substantially annular plate shape. The thickness dimension of the flat plate portion 84 is the axial distance between the lid member 38 and the circular bottom portion 44 of the partition member main body 36, which is the axial dimension of the accommodating region 74, in other words, the axial dimension of the upper recess 40. It is smaller than that. In addition, although the thickness dimension of the flat plate-shaped portion 84 according to the present embodiment is substantially constant over the whole, for example, depending on the required spring characteristics, for example, radially outward from the radial center portion It may be gradually enlarged toward the surface, or a protrusion, a groove, a recess, or the like may be formed.

  On the other hand, the peripheral protrusion 86 is formed integrally with the flat plate portion 84 so as to extend outward in the radial direction from the outer peripheral edge portion of the flat plate portion 84, and protrudes outward in the axial direction from the flat plate portion 84. It extends continuously in the circumferential direction with a rectangular cross section. In other words, the peripheral protrusion 86 is thicker than the flat plate portion 84 and has an annular shape. Before the rubber elastic film 82 is assembled to the partition member 34, the axial dimension of the peripheral protrusion 86 is made larger than the axial dimension of the accommodation region 74. In addition, the outer diameter dimension of the peripheral protrusion 86 is slightly smaller than the diameter dimension of the upper recess 40 of the partition member main body 36 that is the dimension perpendicular to the axis of the accommodation region 74.

  In particular, in the present embodiment, in the radial center portion of the flat plate portion 84 of the rubber elastic film 82, the central protrusion 88 as the elastic protrusion is on both sides in the thickness direction (up and down in FIG. 1) extending in the axial direction. It protrudes and is integrally formed with the flat plate portion 84. The central protrusion 88 has a circular cross section larger than the diameter of each of the communication holes 46 and 62 of the partition member main body 36 and the lid member 38 and is protruded from the both surfaces of the rubber elastic film 82 by a substantially equal distance outward in the axial direction. Yes. The axial dimension (thickness dimension) of the central protrusion 88 is slightly larger than the axial dimension of the peripheral protrusion 86 before the rubber elastic film 82 is assembled to the partition member 34. The housing area 74 is made larger than the axial dimension.

  Further, a relief hole 90 extending in a substantially constant circular cross section in the axial direction and penetrating both axial end faces is formed in the central portion in the radial direction of the central protrusion 88. The diameter of the relief hole 90 is substantially the same as the diameter of each of the communication holes 46 and 62 of the partition member main body 36 and the lid member 38. That is, in the present embodiment, the central protrusion 88 and the relief hole 90 cooperate to constitute a cylindrical portion having an axial dimension larger than the thickness dimension of the rubber elastic film 82. The part has a configuration in which the rubber elastic film 82 is disposed through the central portion in the radial direction. As a result, the thin flat plate-like portion 84 in the rubber elastic film 82 has an annular shape between the radial center portion where the central protrusion 88 is protruded and the radially outer peripheral portion where the peripheral protrusion 86 is integrally formed. It is formed in the area.

  The rubber elastic film 82 is fitted into the upper recess 40 of the partition member main body 36, and the lower end surface of the peripheral protrusion 86 formed on the outer peripheral edge of the rubber elastic film 82 is formed on the circular bottom 44 of the partition member main body 36. It is superimposed on the outer periphery. In particular, since the outer diameter of the peripheral protrusion 86 is slightly smaller than the diameter of the upper recess 40, the rubber elastic film 82 can be obtained by fitting the peripheral protrusion 86 into the upper recess 40. And a centering function in which the partition member main body 36 is positioned coaxially. Thereby, the central axis of the circular bottom 44 of the partition member main body 36 and the central axis of the relief hole 90 of the rubber elastic film 82 are positioned substantially on the same line, and one of the relief holes 90 (below in FIG. 1). One projecting tip portion of the central projecting portion 88 that constitutes the peripheral edge portion of the opening and the peripheral edge portion of the communication hole 46 of the circular bottom portion 44 are opposed to each other in the axial direction. Further, one protruding tip portion of the peripheral protrusion 86 and the outer peripheral portion radially outward from the through hole 48 of the circular bottom portion 44 are opposed to each other in the axial direction. When the rubber elastic film 82 is fitted into the upper recess 44 in this way, the other protruding tip portion of the center protrusion 88 and the peripheral protrusion 86 (upper in FIG. 1) is more than the opening end surface of the upper recess 44. It is projected outward in the axial direction.

  Further, the lid member 38 is superimposed on the upper end portion of the partition member body 36, and the lid member 38 and the partition member body 36 are coaxially aligned, so that the lid member 38 and the rubber elastic film 82 are also coaxial. Are aligned. Here, the projecting tip portion of the central projection 88 is axially opposed to the periphery of the communication hole 62 of the lid member 38, and the projecting tip portion of the peripheral projection 86 is the through hole of the lid member 38. It is opposed to the outer peripheral portion radially outward from 64 in the axial direction. Then, the cover member 38 is closely overlapped with the upper end portion of the partition member main body 36 to form the accommodation region 74, so that the peripheral protrusion 86 and the central protrusion 88 protruding from the upper recess 40 are formed. Thus, the lid member 38 is pressed in the axial direction.

  As a result, the peripheral protrusion 86 is compressed and deformed in the axial direction on the outer peripheral side of the housing region 74 between the lid member 38 and the circular bottom 44, and both ends of the peripheral protrusion 86 in the axial direction are compressed. The surfaces are in close contact with the lid member 38 and the circular bottom 44, respectively. Further, along with the bulging deformation in the direction perpendicular to the axis due to the compressive deformation in the axial direction of the peripheral protrusion 86, the outer peripheral surface of the peripheral protrusion 86 is against the peripheral wall surface of the upper recess 40 constituting the peripheral wall portion of the housing region 74. Have been closely. As a result, the outer peripheral edge portion of the rubber elastic film 82 is fixedly supported by the partition member 34 fixed to the second mounting bracket 14, and the outer peripheral edge portion of the rubber elastic film 82 and the accommodation region 74. Free fluid flow between the walls is prevented.

  In addition, the central protrusion 88 of the rubber elastic film 82 is compressed and deformed in the axial direction based on being sandwiched between the lid member 38 and the circular bottom 44 on the radial center side of the housing region 74, so that the central protrusion The projecting end surfaces on both sides in the axial direction of the portion 88 are in close contact with the communication hole 62 around the lower end surface of the lid member 38 and the communication hole 46 around the upper end surface of the circular bottom 44. Thereby, one opening (upper in FIG. 1) of the relief hole 90 in the rubber elastic film 82 is connected to the pressure receiving chamber 76 through the communication hole 62 of the lid member 38, while the other opening ( The lower opening in FIG. 1 is connected to the equilibrium chamber 78 through the communication hole 46 in the circular bottom 44.

  In such a state in which the rubber elastic film 82 is disposed on the partition member 34, the outer peripheral edge portion provided with the peripheral protrusion 86 and the radial center portion including the central protrusion 88 in the rubber elastic film 82 are the lid member. 38 and the circular bottom 44 of the partition member main body 36 are supported in a compressed state in a compressed state. In other words, the central protrusion 88 and the peripheral protrusion 86 are pre-compressed in the axial direction.

  On the other hand, in the rubber elastic film 82, a flat plate-like portion 84 between the central portion in the radial direction and the outer peripheral edge portion is arranged so as to spread in a direction perpendicular to the axis at the substantially central portion in the axial direction of the accommodating region 74. The lid member 38 opposed to the other side and the circular bottom 44 opposed to the other side in the axial direction are spaced apart from each other by a substantially equal distance. The pressure of the pressure receiving chamber 76 is applied to one surface (upper in FIG. 1) of the flat plate portion 84 through the through hole 62 of the lid member 38, and the flat plate through the through hole 46 of the circular bottom portion 44. The pressure of the equilibrium chamber 78 is applied to the other surface (lower side in FIG. 1) of the shaped portion 84.

  Therefore, in the rubber elastic film 82 according to the present embodiment, the elastic deformation of the radial central portion and the outer peripheral edge is restricted by the partition member 34, while the elastic deformation of the flat plate portion 84 is the accommodation region of the partition member 34. The flat plate portion 84 is elastically deformed based on the relative pressure difference between the pressure receiving chamber 76 and the equilibrium chamber 78. When the rubber elastic film 82 is displaced by the elastic deformation of the flat plate portion 84, the pressure fluctuation in the pressure receiving chamber 76 is absorbed. That is, the hydraulic pressure absorbing mechanism of the pressure receiving chamber 76 includes the rubber elastic film 82, the through hole 48 of the partition member main body 36, and the through hole 64 of the lid member 38. Further, as is apparent from the above description, it is fixedly provided with respect to the second mounting member 14, and the elastic deformation of the central portion of the rubber elastic film 82 is limited by the central protrusion 88 coming into contact therewith. The contact member includes the lid member 38 and the circular bottom portion 44 of the partition member main body 36. Further, when the flat plate portion 84 of the rubber elastic film 82 is displaced in the thickness direction and comes into contact with the circular bottom portion 44 of the lid member 38 or the partition member main body 36, the amount of displacement of the rubber elastic film 82 in the thickness direction is reduced. The hydraulic pressure absorption action of the pressure receiving chamber 76 due to the displacement of the rubber elastic film 82 is limited.

  In particular, in the present embodiment, a vibration isolation effect based on the hydraulic pressure absorption effect of the pressure receiving chamber 76 due to the elastic deformation of the rubber elastic film 82 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 rubber elastic film 82 is tuned so that (the vibration insulation effect based on the low dynamic spring characteristic) is effectively exhibited.

  Further, a valve member 92 is disposed on the lid member 38 side of the partition member 34. The valve member 92 has a thin, substantially annular plate shape, and preferably has a relatively large elasticity by being formed using a metal material such as spring steel. The outer diameter dimension of the valve member 92 is substantially the same as the outer diameter dimension of the lid member 38, and the inner diameter dimension of the valve member 92 is radially outside the second small hole 68 in the through hole 64 of the lid member 38. It is made larger than the diameter dimension of the peripheral edge part. Further, a notch-shaped communication window 94 is formed on the outer peripheral edge of the valve member 92. Further, a plurality (three in this embodiment) of locking holes 96 are provided in the middle portion in the radial direction of the valve member 92 so as to be spaced apart in the circumferential direction.

  A valve plate 98 is integrally formed at one place on the circumference of the inner peripheral edge of the valve member 92. The valve plate portion 98 has a substantially flat plate shape and protrudes from the inner peripheral edge portion of the valve member 92 toward the center inside the valve member 92. One (on the top in FIGS. 1 and 3) surface on the front end side in the protruding direction (right in FIG. 2) of the valve plate 98 extends from the valve plate 98 in a tapered manner outward in the axial direction. A mass portion 100 is provided in a protruding manner. A contact rubber layer 102 is formed on the surface of the valve plate 98 opposite to the mass portion 100. The abutting rubber layer 102 is a rubber material that spreads out with a substantially constant thickness throughout. In the present embodiment, the mass portion 100 is made of a rubber material, and the mass portion 100 and the contact rubber layer 102 are integrally vulcanized and molded through a hole penetrating the valve plate portion 98.

  Further, on the base end side (left in FIG. 2) of the valve plate portion 94, the valve plate 94 rises from one side (down in FIG. 1) toward the other side (up in FIG. 1). By extending, the bent portion 104 inclined with respect to the valve member 92 is integrally formed. Although not specifically shown in the drawing, in the state of a single product in which the valve member 92 is not assembled to the partition member 34, the tip end portion in the protruding direction including the mass portion 100 and the contact rubber layer 102 in the valve plate portion 98 is a shaft. By extending relative to the bent portion 104 so as to drop from the mass portion 102 side, which is the other side in the direction, toward the contact rubber layer 102 side, which is the one side in the axial direction, the valve member 92 is inclined. ing.

  The valve member 92 is overlapped with the upper end portion of the lid member 38 in the partition member 34 in the axial direction, and the outer peripheral portion of the valve member 92 is the outer peripheral portion of the step portion 20 of the second mounting bracket 14 and the lid member 38. And is supported between the axial directions. In addition, the locking projections 60 of the partition member main body 36 are fitted and fixed in the locking holes 96 of the valve member 92, so that the valve member 92 and the lid member 38 are positioned in the circumferential direction. It is assembled. By such positioning in the circumferential direction, the inner peripheral edge portion of the valve member 92 is superimposed on the outer peripheral portion of the lid member 38 at a position not projected in the axial direction with the through hole 64 in the lid member 38, and the through hole 64 of the lid member 38. The pressure receiving chamber 76 and the accommodation region 74 are kept in communication with each other through the inside of the valve member 92. Further, the communication window 94 of the valve member 92 and the communication window 70 of the lid member 38 are overlapped in the axial direction, and one end portion of the orifice passage 80 is connected to each of the partition member main body 36, the lid member 38, and the valve member 92. It is connected to the pressure receiving chamber 76 through the communication windows 56, 70 and 94.

  Further, the valve plate portion 98 of the valve member 92 is overlapped in the axial direction around the communication hole 62 of the lid member 38 via the contact rubber layer 102, so that the valve member 92 is in close contact with the outer peripheral portion of the lid member 38. In addition, the bent portion 104 of the valve member 92 is elastically deformed so as to rise further from one axial side (lower in FIG. 1) to the other side (upper in FIG. 1). The valve plate portion 98 is displaced so as to extend substantially parallel to the valve member 92 and the lid member 38 and is superimposed on the lid member 38. That is, the valve plate portion 98 is urged downward based on the elastic restoring force of the bent portion 104 and the mass of the mass portion 100, and around the communication hole 62 of the lid member 38 via the contact rubber layer 102. By overlapping fluid tightly, the communication hole 62 and the opening on the pressure receiving chamber 76 side of the relief hole 90 are closed. Thereby, pressure leakage through the relief hole 90 of the pressure receiving chamber 76 does not occur. As is clear from the above description, the opening of the relief hole 90 on the equilibrium chamber 78 side is always in communication with the equilibrium chamber 78 through the communication hole 46 of the circular bottom 44 of the partition member body 36. . The contact member that overlaps the opening end surface of the relief hole 90 on the pressure receiving chamber 76 side and covers the relief hole 90 includes the lid member 38 and the valve member 92.

  In particular, in this embodiment, the contact rubber layer 102 of the valve plate portion 98 is covered with a normal magnitude of vibration or load input between the first mounting bracket 12 and the second mounting bracket 14. The spring characteristics and mass portions of the valve member 92 having the bent portion 104 and the valve plate portion 98 so that the closed state of the opening portion of the relief hole 90 on the pressure receiving chamber 76 side is maintained in contact with the member 38. A mass of 100 is set.

  On the other hand, when excessive vibration or load is input between the first mounting bracket 12 and the second mounting bracket 14 and a large negative pressure in question is generated in the pressure receiving chamber 76, the contact rubber layer 102. In addition, a negative pressure action is exerted on the valve plate portion 98 and the bent portion 104 including the mass portion 100, and the bent portion 104 rises further from the one equilibrium chamber 78 side toward the other pressure receiving chamber 76 side. In accordance with the elastic deformation, the valve plate portion 98 is displaced toward the pressure receiving chamber 76 side, so that the contact rubber layer 102 is separated from the lid member 38. A mass of 100 is set. When the contact rubber layer 102 is separated from the lid member 38 and the opening on the pressure receiving chamber 76 side of the relief hole 90 is opened with respect to the pressure receiving chamber 76, the relief hole 90 becomes the pressure receiving chamber 76 and the equilibrium chamber. The pressure receiving chamber 76 and the equilibrium chamber 78 are short-circuited through the communication hole 62 of the lid member 38, the relief hole 90, and the communication hole 46 of the circular bottom 44.

  In the rubber elastic film 82, a haunch-like portion 106 as a corner portion is integrally formed at a boundary portion that is a connecting portion between the peripheral protrusion 86 and the flat plate-like portion 84. That is, in this embodiment, the radial direction of the peripheral protrusion 86 that extends axially outward (up and down in FIGS. 1 and 5) from the connection portion at the connection portion where the peripheral protrusion 86 and the flat plate portion 84 are substantially orthogonal to each other. A haunch-like portion 106 is formed so as to extend along the inner peripheral surface and the end surface of the radially outer peripheral portion of the flat plate-like portion 84 extending in the direction perpendicular to the axis (left and right in FIGS. 1 and 5) from the connecting portion. ing.

  The hunch-like portion 106 has a substantially planar arc shape or a rectangular shape extending with a substantially constant width dimension in the circumferential direction of the boundary portion between the peripheral protrusion 86 and the flat plate-like portion 84. In addition, the radially outer peripheral edge portion of the haunch-like portion 106 is integrally formed so as to overlap with the radially inner peripheral wall portion of the peripheral protrusion 86 in the radial direction. The circumferential inner part in the direction is integrally formed so as to overlap the outer peripheral part radially inward of the outer peripheral part connected to the peripheral protrusion 86 in the flat plate-like part 84. The height dimension extending in the axial direction of the haunch-like portion 106 is changed from the radial outer peripheral surface overlapped with the peripheral protrusion 86 to the radially inner peripheral surface overlapped with the end surface on the radial outer peripheral side of the flat plate-like portion 84. It is gradually becoming smaller. As a result, the axial cross section of the haunch-like portion 106 integrally formed with the rubber elastic film 82 has a triangular shape whose height decreases from the outside in the direction perpendicular to the axis to the inside, and the haunch-like portion. A surface extending in an inclined manner between the axially outer tip portion and the axially perpendicular inner tip portion of 106 is an inclined surface extending linearly in the axial section.

  In particular, in the present embodiment, the axial dimension of the radially outer peripheral surface overlapped with the peripheral protrusion 86 which is the maximum axial dimension of the haunch-like portion 106 is substantially the same as the axial dimension of the peripheral protrusion 86. On the other hand, the axial dimension of the radially inner circumferential surface that is overlapped with the flat plate-like portion 84 that is the minimum dimension in the axial direction of the haunch-like portion 106 is substantially zero. Also, the axial dimension y of the peripheral wall portion extending in the axial direction along the peripheral protrusion 86 of the haunch-like portion 106 and the axis perpendicular to the end portion extending in the axis-perpendicular direction along the flat plate portion 84 of the haunch-like portion 106. Directional dimension: x is substantially the same, and y / x≈1. As a result, the dimension in the inclined direction of the wall portion extending in an inclined manner between the axially outer tip portion of the hunch-like portion 106 and the axially perpendicular inner tip portion is the axial dimension: y or the axially perpendicular dimension. : X is approximately √2 times.

  In addition, it is desirable that the dimension perpendicular to the axis of the hunch-like portion 106: x is 2 mm or more and the radius dimension of the rubber elastic film 82 is 1/3 or less of r. If the dimension of the hunch-like portion 106 in the direction perpendicular to the axis: x is smaller than 2 mm, it is difficult to obtain the effect of improving the rigidity at the connection portion between the target flat-plate portion 84 and the peripheral protrusion 86, while rubber elasticity This is because when the radius dimension of the film 82 is larger than 1/3 of r, it is considered that the deformation characteristics of the flat plate-like portion 84 and the vibration-proof performance may be affected.

  Eight such haunch-like portions 106 are formed at equal intervals on the periphery of the boundary portion between the flat plate-like portion 84 and the peripheral protrusion 86 in the rubber elastic film 82. In particular, on the periphery of the boundary portion between the flat plate-like portion 84 and the peripheral protrusion 86, the haunch-like portion 106 and the haunch-like portion 106 between each pair of the haunch-like portions 106, 106 adjacent in the circumferential direction are formed. The portion that is not formed is formed with a substantially equal length in the circumferential direction of the rubber elastic film 82.

  Furthermore, in the present embodiment, the rubber elastic film 82 is made to be opposed to the haunch-like portion 106 formed on one surface in the thickness direction (upper side in FIGS. 1 and 5) in the thickness direction so that the rubber elasticity A haunch-like portion 106 is also formed on the other surface in the thickness direction of the film 82 (lower side in FIGS. 1 and 5). That is, the haunch-like portion 106 is formed at the same position on both sides of the rubber elastic film 82. In particular, all the 16 haunch-like portions 106 of the rubber elastic film 82 according to the present embodiment have the same standard such as shape and size.

  In the automobile engine mount 10 having the above-described structure, a relatively large pressure fluctuation is generated in the pressure receiving chamber 76 when vibration in a low frequency region such as an engine shake which is a problem during traveling is input. Since this pressure is large, the rubber elastic film 82 tuned to a small amplitude cannot substantially absorb the pressure in the pressure receiving chamber 76. Further, particularly in a state where no negative pressure is generated in the pressure receiving chamber 76, the valve plate portion 98 is fluid-tightly overlapped around the communication hole 62 of the lid member 38, and the state where the relief hole 90 is closed is maintained. Has been. Accordingly, absorption of pressure fluctuations in the pressure receiving chamber 76 due to elastic deformation of the rubber elastic film 82 and pressure leakage of the pressure receiving chamber 76 through the relief hole 90 are suppressed, and therefore effective between the pressure receiving chamber 76 and the equilibrium chamber 78. As a result, a sufficient pressure difference is generated, and a sufficient amount of fluid flows through the orifice passage 80. Therefore, based on the fluid action such as the resonance action of the fluid through the orifice passage 80, an effective anti-vibration effect (high damping effect) is exhibited against vibrations in a low frequency region such as an engine shake.

  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 76. At that time, since the frequency range of the vibration is higher than the tuning frequency of the orifice passage 80, the orifice passage 80 is substantially closed due to an increase in fluid flow resistance due to an anti-resonant action. Therefore, the pressure variation in the pressure receiving chamber 76 is absorbed based on the elastic deformation of the flat plate portion 84 in the rubber elastic film 82 tuned to the middle frequency range, resulting in substantial obstruction of the orifice passage 80. Therefore, the remarkably high dynamic spring is 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.

  In the configuration in which the pressure fluctuation of the pressure receiving chamber 76 is absorbed by the elastic deformation of the rubber elastic film 82, the pressure is extremely small. Therefore, the valve plate 98 is covered with the lid member 38 by the negative pressure action of the pressure receiving chamber 76. Thus, a negative pressure that is large enough to be displaced away from the pressure chamber hardly occurs in the pressure receiving chamber 76. Thus, the state in which the opening of the relief hole 90 on the pressure receiving chamber 76 side is closed by the valve plate portion 98 is maintained, and based on the displacement caused by the deformation of the flat plate portion 84 of the rubber elastic film 82, The hydraulic pressure absorption effect is stably obtained.

  Further, when an automobile rides over a step or travels on a road surface with large unevenness and an impact load is input between the first mounting bracket 12 and the second mounting bracket 14, the main rubber elastic body 16 is moved. Abruptly or excessively elastically deforming may cause excessive negative pressure in the pressure receiving chamber 76 to generate cavitation bubbles that are a cause of abnormal noise.

  Here, in the automotive engine mount 10 of the present embodiment, when a negative pressure is applied to the valve plate portion 98 at the stage of a large negative pressure before the cavitation bubbles are generated, the spring characteristics and mass portions of the valve member 92 are obtained. Based on the mass setting of 100, the valve plate 98 is separated from the lid member 38, and the closed state of the relief hole 90 is released. As a result, the pressure receiving chamber 76 and the equilibrium chamber 78 are communicated with each other through the relief hole 90, the pressure in the pressure receiving chamber 76 and the pressure in the equilibrium chamber 78 are brought into an equilibrium state, and the overnegative pressure state of the pressure receiving chamber 76 is eliminated. As a result, the generation of cavitation bubbles is advantageously suppressed, and problematic abnormal noises and vibrations are prevented.

  Therefore, in the engine mount 10 for automobiles of this structure, the haunch-like portion 106 is formed at the boundary portion between the peripheral projection 86 and the flat plate-like portion 84 in the rubber elastic film 82, so that the thick portion of the boundary portion is formed. The rigidity is improved based on the conversion. As a result, since the holding force by the partition member 34 of the peripheral protrusion 86 is increased, even when a relatively large vibration load is input and the flat plate portion 84 of the rubber elastic film 82 is elastically deformed, Along with such deformation, the peripheral protrusion 86 is restrained from being displaced such as tilting with respect to the partition member 34. Thereby, abnormal noise such as stick-slip noise caused by the displacement of the peripheral protrusion 86 is suppressed.

  In particular, in the present embodiment, in addition to the three or more hunched portions 106 formed at equal intervals on the circumference of the rubber elastic film 82, they are formed at the same position on both surfaces of the rubber elastic film 82. Therefore, even when the connection portion between the flat plate portion 84 and the peripheral protrusion 86 is thickened more effectively and the rubber elastic film 82 is input in the twisting direction, the twisting direction, etc. As the displacement of the protrusion 86 is suppressed, the support force of the peripheral protrusion 86 on the partition member 34 is improved, and thus the above-described stick-slip noise reduction effect can be obtained more effectively.

  Further, since the haunch-like portion 106 has a haunch shape that gradually becomes thinner from the peripheral protrusion 86 toward the radial center of the flat plate portion 84, a connection portion between the peripheral protrusion 86 and the flat plate portion 84. It is possible to suppress the generation of large stress accompanying elastic deformation of the flat plate portion 84 in the hunched portion 106 while effectively improving the rigidity by increasing the thickness of the flat plate portion 84. Therefore, the durability of the haunch-like portion 106 is improved, and the effect of preventing stick-slip noise can be stably obtained over a relatively long period of time.

  Furthermore, since a plurality of the hunched portions 106 are formed in a divided state on the circumference of the rubber elastic film 82, the rubber elastic film 82 is formed in the circumferential upper portion of the rubber elastic film 82 where the hunched portions 106 are not formed. Is effectively secured with a length close to the length where the haunch-like portion 106 is not formed. Therefore, the anti-tilt effect of the peripheral protrusion 86 by the haunch-like portion 106 is achieved without significantly reducing the hydraulic pressure absorbing function of the rubber elastic film 82, and the desired anti-vibration performance is also effectively exhibited. Can be done.

  In the present embodiment, a cylindrical or annular central protrusion 88 and a peripheral protrusion 86 extending at substantially the same height on both sides in the axial direction are formed at the radially central portion and the outer peripheral edge of the rubber elastic film 82. In addition to this, the plurality of haunch-like portions 106 are set to the same standard and are formed at equal intervals on the circumference of the rubber elastic film 82 and at the same position on both sides. As a result, the rubber elastic film 82 has a symmetrical shape on both sides, and has no special directionality in the circumferential direction. As a result, the assembly of the rubber elastic film 82 to the partition member 34 is simplified, and the production efficiency can be improved.

  Further, in the present embodiment, the deformation of the central portion of the rubber elastic film 82 is limited by the clamping arrangement of the central protrusion 88 with respect to the partition member 34, so that the partition member 34 at the central portion of the rubber elastic film 82 is moved. The hitting sound resulting from the hit of the hit is effectively suppressed. In addition, the deformation of the central protrusion 88 and the peripheral protrusion 86 in the rubber elastic film 82 is constrained together, so that the flat plate portion 84 in the intermediate portion in the radial direction of the rubber elastic film 82 is stably in the accommodation region 4. Since it is supported, the hydraulic pressure absorption effect of the pressure receiving chamber 76 can be obtained efficiently, and the intended vibration isolation effect can be obtained more stably.

  Furthermore, in the present embodiment, the relief hole 90 is formed using the space inside the central protrusion 88 in the rubber elastic film 82, so that the short-circuit mechanism of the pressure receiving chamber 76 and the equilibrium chamber 78 in the partition member 34. The space can be reduced, and the mount 10 can be made compact.

  In the present embodiment, the contact member that restricts the elastic deformation of the central portion of the rubber elastic film 82 includes the lid member 38 and the circular bottom 44 of the partition member main body 36, and the relief hole 90. The abutting member that is superimposed on the opening end surface on the pressure receiving chamber 76 side and covers the relief hole 90 includes the lid member 38 and the valve member 92. The partition member main body 36 and the lid member 38 constitute a part of the partition member 34 that partitions the pressure receiving chamber 76 and the equilibrium chamber 78. That is, since these abutting members are configured using the partition member 34, it is not necessary to newly provide the abutting members, and an increase in the number of parts and a complicated structure can be prevented, thereby reducing the size and the size. Cost reduction can be effectively achieved.

  The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific descriptions in the 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. In the following description, members and parts having substantially the same structure as those of the above-described embodiment will be denoted by the same reference numerals as those of the above-described embodiment, and detailed description thereof will be omitted.

  For example, the shape, size, structure, arrangement, number, etc. of the peripheral protrusions, flat plate-like parts, central protrusions, hunch-like parts, valve members, etc. constituting the partition member 34 and the rubber elastic film 82 are as illustrated. It is not limited to kimono.

  Specifically, although the surface of the haunch-like portion 106 is an inclined surface extending linearly in the axial cross section, it may be an inclined surface curved in a concave shape or a convex shape, and the haunch-like portion according to the present invention. Various triangular cross-sectional structures that reinforce the connecting portion between the peripheral protrusion 86 of the rubber elastic film 82 and the flat plate-like portion 84 can be adopted.

  Furthermore, in the above-described embodiment, the plurality of hunched portions 106 have the same shape and size, and are formed at equal intervals on the circumference of the rubber elastic film 82 and at the same position on both sides. Is not limited to this, and depending on the required manufacturability, anti-vibration characteristics, rigidity, etc., for example, the shape and size of the plurality of hunched portions may be different, or the circumference of the rubber elastic membrane may be Of course, they may be provided at unequal intervals or at positions where they do not overlap on both sides of the rubber elastic film. Specifically, as shown also in FIG. 7, the circumferential direction and thickness of a plurality of hunch-like portions 106a formed at equal intervals on one surface (front side in FIG. 7) of the rubber elastic film 108 By forming the haunch-like portion 106b on the other surface (the back side in FIG. 7) of the rubber elastic membrane 108 that overlaps in the direction, the haunch-like portions 106a and 106b are formed at different positions on both sides of the rubber elastic membrane 108, and It is also possible to form the rubber elastic film 108 at equal intervals on one surface and the other surface.

  Further, the central protrusion 88 of the rubber elastic film 82 is provided according to the required vibration isolation characteristics, and is not an essential constituent requirement. In addition, for example, a protrusion is protruded toward the accommodation region on at least one side of the partitioning member sandwiching the rubber elastic film toward the accommodation region, and an appropriate portion of the rubber elastic film is held in the axial direction via the protrusion. It is also possible to constrain the deformation of the clamping portion by caulking.

  Further, the short-circuit mechanism such as the relief hole 90 and the valve member 92 is not an essential component. That is, as shown in FIG. 8, the partition member 34 is provided with a rubber elastic membrane 112 having a disk-shaped flat plate portion 110 in which the relief hole 90 and the central protrusion 88 are not formed in the central portion. The central portion of the flat plate-like portion 110 is also accommodated and arranged so as to be elastically deformable with respect to the accommodating area 74 of the lid member 38 and the partition member body 34 around each central portion of the partition member main body 34 where the communication holes 46 and 62 are not formed. The pressure in the pressure receiving chamber 76 and the equilibrium chamber 78 may be exerted on the rubber elastic membrane 112 through the communication holes 48 and 64. Therefore, in this case, it is not necessary to arrange the valve member 92 so as to overlap the lid member 38.

  In the above embodiment, the valve member 92 and the lid member 38 are formed separately. For example, the lid member is formed using disk-shaped spring steel or the like, and a punched hole is provided in the center thereof. Thus, the lid member and the valve member can be integrally formed by cutting and raising the inside of the hole to form the valve plate portion.

  In the above-described embodiment, the relief hole 90 is provided at the central portion in the radial direction of the rubber elastic film 82 and provided on the substantially central axis of the mount 10. For example, the rubber elastic film is used as the central axis of the mount. The relief hole may be provided at a position deviated from the center axis of the mount by disposing the relief hole at a position offset from the radial central portion of the rubber elastic membrane. Is possible.

  Further, in the automobile engine mount according to the embodiment, the structure provided with the single orifice passage is adopted. For example, as the orifice passage, the first orifice passage and the higher frequency region than the first orifice passage are used. A structure provided with a second orifice passage tuned to the above may be employed. Thus, for example, when vibrations that are likely to cause problems are present in the low-frequency range and the middle to high-frequency range, the resonance frequency of each fluid that flows through the first orifice passage and the second orifice passage is reduced. By tuning to the frequency range and the high frequency range, the vibration isolation effect can be effectively exhibited against a plurality of vibrations.

  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, a suspension member mount, etc. Any of them can be applied to the body vibration isolator.

It is a longitudinal cross-sectional view of the engine mount for motor vehicles as one Embodiment of this invention, Comprising: The figure corresponded in the II cross section of FIG. The top view of the partition member which comprises a part of engine mount for the said motor vehicles. The one side view of the partition member. The bottom view of the partition member. It is a longitudinal cross-sectional view of the rubber elastic membrane which comprises a part of the engine mount for the motor vehicles, Comprising: The figure corresponded in the VV cross section of FIG. The top view of the rubber elastic membrane. The top view of the rubber elastic membrane which comprises a part of engine mount for motor vehicles as another specific example of this invention. The longitudinal cross-sectional view of the principal part of the engine mount for motor vehicles as another specific example of this invention.

Explanation of symbols

10: automotive engine mount, 12: first mounting bracket, 14: second mounting bracket, 16: rubber elastic body, 28: diaphragm, 34: partition member, 36: partition member body, 38: lid member, 44: Circular bottom, 48: Through hole, 60: Communication hole, 64: Through hole, 76: Pressure receiving chamber, 78: Equilibrium chamber, 80: Orifice passage, 82: Rubber elastic membrane, 84: Flat plate portion, 86: Periphery Projection, 106: Haunch-shaped part

Claims (6)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and a pressure receiving chamber in which a part of a wall portion is configured by the main rubber elastic body and incompressible fluid is enclosed, and a flexible An equilibrium chamber in which a part of the wall portion is formed of an insulative film and in which an incompressible fluid is sealed is formed, and the pressure receiving chamber and the equilibrium chamber are communicated with each other by an orifice passage. A movable rubber film is disposed therebetween so 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. In a fluid-filled vibration isolator that constitutes a hydraulic pressure absorption mechanism that absorbs minute pressure fluctuations in the pressure receiving chamber by
The outer peripheral edge of the movable rubber film is protruded on both sides over the entire circumference to form an annular thick sandwiching part integrally, and the support member fixedly provided to the second attachment member By sandwiching and supporting the thick sandwiched portion from both sides in the thickness direction, the movable rubber film is disposed in a state where elastic deformation is allowed in the thin portion on the inner peripheral side of the thick sandwiched portion, A haunch extending from the thick sandwiched portion toward the thin portion at a plurality of locations on the circumference at a boundary portion between the thick sandwiched portion on both surfaces of the movable rubber film and the thin portion on the inner periphery thereof A fluid-filled type vibration damping device characterized by integrally forming a corner-shaped cornered portion.   The fluid-filled vibration isolator according to claim 1, wherein the corner portion is formed at the same position on both surfaces of the movable rubber film.   3. The fluid-filled vibration isolator according to claim 1, wherein three or more corner portions are formed at equal intervals on the periphery of the movable rubber film.   A partition member that is fixedly supported with respect to the second mounting member and partitions the pressure receiving chamber and the equilibrium chamber is provided, and the movable rubber film is disposed at a central portion of the partition member. 4. The fluid-filled vibration isolator according to claim 1, wherein the support member is configured by the partition member, and the orifice passage is formed in an outer peripheral portion of the partition member. 5.   An elastic protrusion that protrudes on both sides in the thickness direction is integrally formed at the central portion of the movable rubber film, and the elastic protrusion against the abutting member that is fixedly provided to the second mounting member. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein the elastic deformation at the center portion of the movable rubber film is limited by the contact of the movable rubber film.   The elastic protrusion is formed with a relief hole extending through both sides of the movable rubber film, and the inside of the relief hole is always in communication with the equilibrium chamber, The fluid-filled vibration isolator according to claim 5, wherein the contact member is overlapped and covered with an opening end surface of the relief hole toward the pressure receiving chamber.

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