JP5061132B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to an anti-vibration device applied to, for example, an engine mount of an automobile, and more particularly to a fluid-filled anti-vibration device that uses an anti-vibration effect based on a fluid action of a fluid enclosed inside.

  2. Description of the Related Art Conventionally, there has been known an anti-vibration device that is interposed between members that constitute a vibration transmission system and that makes these members mutually anti-vibration connected or anti-vibration supported. This vibration isolator has a structure in which a first mounting bracket attached to one member constituting a vibration transmission system and a second mounting bracket attached to the other member are interconnected by a rubber elastic body. is doing.

  In addition, as a kind of vibration isolator, a fluid having a pressure receiving chamber and an equilibrium chamber in which an incompressible fluid is sealed is formed, and an orifice passage that communicates the pressure receiving chamber and the equilibrium chamber is formed. An enclosed vibration isolator has also been proposed. In such a fluid filled type vibration isolator, an excellent vibration isolating effect is exhibited based on the fluid flow action with respect to the input vibration of the frequency at which the orifice passage is tuned. Application to is being considered. For example, it is shown in patent document 1 (Unexamined-Japanese-Patent No. 2004-19704).

  By the way, in the fluid-filled vibration isolator, as shown in Patent Document 1, a movable plate is provided to obtain an effective vibration isolating effect against a plurality of types of vibrations having different frequencies. A structure has also been proposed. That is, an accommodation space is formed with respect to a partition member that partitions the pressure receiving chamber and the equilibrium chamber, and the accommodation space is communicated with the pressure receiving chamber and the equilibrium chamber, and the elastic space is formed with respect to the accommodation space. The movable plate is disposed so as to be minutely displaceable in the opposing direction of the pressure receiving chamber and the equilibrium chamber. When a relative pressure difference is generated between the pressure receiving chamber and the equilibrium chamber due to the vibration input, the hydraulic pressure in the pressure receiving chamber is released to the equilibrium chamber by a minute displacement of the movable plate.

  In the fluid-filled vibration isolator provided with such a movable plate, the movable plate is slightly displaced in the accommodation space at the time of vibration input, so that the movable plate is abutted against the partition member. Then, the impact force caused by the contact of the movable plate with the partition member is transmitted to the member constituting the vibration transmission system via the second mounting bracket that supports the partition member, and thus abnormal noise may occur. There is.

  On the other hand, in Patent Document 1, the partition member is supported by the second mounting bracket through a thin rubber layer. However, in Patent Document 1, the rubber layer is merely provided for fluid-tightly assembling the partition member to the second mounting bracket, and the impact force due to the contact of the movable plate can be reduced. A rubber layer having a sufficient thickness is not formed. Therefore, in the structure described in Patent Document 1, it is difficult to prevent the generation of abnormal noise due to the contact of the movable plate.

  Note that it is conceivable to reduce the transmission of the contact hitting sound by reducing the contact force between the rubber layer and the outer peripheral surface of the partition member. However, if the contact force is reduced, the partition member is attached to the inner peripheral surface with rubber. In some cases, the second mounting bracket on which the layer is deposited may be displaced relatively in the axial direction. As a result, the orifice passage formed so as to open to the outer peripheral surface of the partition member loses its sealing performance, and the tuning of the orifice passage is changed and the flow amount of the fluid is reduced, so that the prevention based on the resonance action and the like is prevented. There was a risk that the vibration effect would not be exhibited effectively.

JP 2004-19704 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the partition member can be stably held and the orifice passage can be prevented from being short-circuited. An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure capable of reducing or avoiding a hitting sound caused by contact of a movable plate with a partition member.

  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 connects the first mounting member and the cylindrical second mounting member with the main rubber elastic body, and closes one opening of the second mounting member with the main rubber elastic body, The other opening of the second mounting member is closed with a flexible membrane to form a fluid chamber in which an incompressible fluid is sealed between the opposing surfaces of the main rubber elastic body and the flexible membrane, A partition member is disposed in the fluid chamber and supported by the second mounting member, and a pressure receiving chamber composed of a main body rubber elastic body is formed on one side with the partition member interposed therebetween, In a fluid-filled vibration isolator in which an equilibrium chamber composed of a flexible membrane is formed on the other side of the wall and the pressure receiving chamber and the equilibrium chamber communicate with each other through an orifice passage. A movable member is disposed in the central hole of the partition member main body, and the movable member is attached to the partition member main body via a support rubber elastic body. The movable plate is slidably accommodated in the movable member, and the pressure on the pressure receiving chamber side and the pressure on the equilibrium chamber side are applied to one surface of the movable plate through a through hole provided in the movable member. On the other hand, a concave groove is formed on the outer peripheral surface of the partition member main body, and an assembly sleeve is externally attached to the partition member main body so as to be fitted to the outer peripheral surface of the partition member main body via a rubber elastic body. And the recessed groove is covered with an assembly sleeve to form an orifice passage, thereby forming a partition member including the partition member main body, the movable member, the movable plate, and the assembly sleeve, and the partition member as the second member. The mounting member is housed and assembled so as to be displaceable in the axial direction, an assembly rubber elastic body is provided on the outer peripheral surface of the assembly sleeve in the partition member, and the partition member body is mounted using the assembly rubber elastic body. Shaft against second mounting member That undergo elastic supporting countercurrent, characterized.

  In the fluid-filled vibration isolator having the structure according to the present invention as described above, the movable member constituting the contact surface against which the movable plate is abutted is bufferedly supported with respect to the second mounting member. Therefore, it is possible to reduce or avoid that the impact force caused by the hitting of the movable plate is transmitted to the second mounting member and thus to the member constituting the vibration transmission system such as the vehicle body.

  In particular, on the transmission path of the impact force from the movable member to the second mounting member, a support rubber elastic body interposed between the movable member and the partition member, and a fit interposed between the partition member body and the assembly sleeve. Three rubber elastic bodies, ie, a rubber elastic body and an assembly rubber elastic body interposed between the assembly sleeve and the second mounting member, are arranged in series. Therefore, the transmission of the impact force that causes the hitting sound or the like is effectively suppressed by the buffering action based on the elastic deformation of these three rubber elastic bodies.

  Moreover, an orifice channel | path can be easily formed by employ | adopting the structure which comprises an orifice channel | path using the concave groove opened on the outer peripheral surface of a partition member main body. Moreover, the assembly sleeve that is elastically supported in the axial direction by the second mounting member is extrapolated to the partition member main body, whereby the opening of the concave groove is closed by the assembly sleeve, and an orifice passage is formed. Has been. Therefore, it is possible to avoid problems such as leakage (short circuit) of the orifice passage while adopting a structure that allows the axial displacement of the partition member with respect to the second mounting member. As a result, a vibration isolation effect based on the resonance action of the fluid can be obtained efficiently.

  In addition, since the partition member main body is assembled so as to be relatively displaceable in the axial direction with respect to the second mounting member, when excessive negative pressure is generated in the pressure receiving chamber, the partition member main body receives the pressure by the action of the negative pressure. It is displaced by suction to the chamber side. As a result, the negative pressure in the pressure receiving chamber is reduced or avoided, and abnormal noise or vibration due to cavitation can be suppressed.

  In the fluid filled type vibration damping device according to the present invention, the axial displacement of the partition member relative to the second mounting member is limited by elastic contact with the main rubber elastic body on the pressure receiving chamber side. On the other hand, it is desirable that the equilibrium chamber side be limited by elastic contact with the contact member fixed to the second mounting member.

  According to this, the displacement of the partition member main body toward the pressure receiving chamber is allowed more easily than the displacement toward the equilibrium chamber due to the elastic deformation of the main rubber elastic body. Therefore, negative pressure generated in the pressure receiving chamber due to excessive vibration input can be advantageously reduced, and cavitation noise can be suppressed more effectively.

  On the other hand, the displacement of the partition member main body toward the equilibrium chamber side is surely limited by the abutting member fixed to the second mounting member, so that the pressure fluctuation in the pressure receiving chamber is efficiently caused during normal vibration input. I can do it. Therefore, the amount of fluid flow through the orifice passage can be advantageously ensured, and a vibration isolation effect based on the fluid flow action can be efficiently obtained.

  In the fluid-filled vibration isolator according to the above aspect, more preferably, the axial end portion of the assembled rubber elastic body on the pressure receiving chamber side contacts the main rubber elastic body on the outer peripheral surface of the assembly sleeve. On the other hand, the partition member main body is abutted and supported in the axial direction with respect to the abutting member via the abutting rubber elastic body on the equilibrium chamber side.

  According to this, when the partition member body is displaced toward the pressure receiving chamber, the assembled rubber elastic body is sheared and deformed, and the displacement of the partition member body is easily allowed by the soft spring. Therefore, it is possible to more effectively reduce noise and vibration due to cavitation.

  On the other hand, when the partition member body is displaced toward the equilibrium chamber, the contact rubber elastic body is compressed and deformed in the axial direction between the partition member body and the contact member. As a result, the spring becomes non-linearly hard, and the displacement of the partition member body is buffered and reliably limited. Therefore, the positive pressure in the pressure receiving chamber can be effectively secured, and the vibration isolation effect based on the fluid flow action can be more efficiently exhibited.

  Further, in the fluid filled type vibration damping device according to the present invention, the axial end portion of the assembled rubber elastic body on the equilibrium chamber side is in contact with the contact member on the outer peripheral surface of the assembly sleeve. The partition member main body may be in contact with the main rubber elastic body in the axial direction on the pressure receiving chamber side.

  Even in such a structure, by appropriately adjusting the hardness of the main rubber elastic body and the assembled rubber elastic body, it is possible to achieve both the effect of reducing cavitation noise and the securing of positive pressure in the pressure receiving chamber. Is possible.

  Further, in the fluid filled type vibration damping device according to the present invention, the outer peripheral surface of the partition member main body has a tapered shape with a gradually decreasing diameter toward either one of the pressure receiving chamber and the equilibrium chamber, and the fitting. It is desirable that the inner peripheral surface of the rubber-adhesive elastic body be a tapered surface corresponding to the outer peripheral surface of the partition member body.

  As described above, the outer peripheral surface of the partition member main body and the inner peripheral surface of the fitting rubber elastic body are each tapered so that the partition member main body is attached to the assembly sleeve (interpolation and positioning). It can be simplified and the fluid-filled vibration isolator according to the present invention can be easily manufactured.

  Further, by adopting the tapered shape, the contact between the outer peripheral surface of the partition member main body and the inner peripheral surface of the assembly sleeve via the fitting rubber elastic body is realized more stably, so that leakage in the orifice passage and The problem of short circuit can be avoided more advantageously.

  Further, in the fluid filled type vibration damping device according to the present invention, an elastic movable film that closes the central hole of the partition member fluid-tightly on either the pressure receiving chamber side or the equilibrium chamber side with respect to the movable member is provided, An intermediate chamber may be formed between the movable member and the elastic movable film, and a second orifice passage may be formed that communicates the intermediate chamber with either the pressure receiving chamber or the equilibrium chamber.

  According to this, the anti-vibration effect based on the fluid flow action exerted in the plurality of orifice passages improves the anti-vibration performance with respect to the vibration input of a specific frequency, and is effective for a plurality of types of vibration inputs with different frequencies. The anti-vibration effect can be exhibited.

  Further, in the above aspect, the first mounting member is spaced from one opening portion side of the second mounting member, and the fixing portion of the second mounting member with respect to the vibration isolation target member is provided in the second mounting member. While provided on the opening side opposite to the first mounting member, a pressure receiving chamber is formed on the first mounting member side with a partition member sandwiched in the axial direction of the second mounting member, and an equilibrium chamber is formed on the opposite side. In addition, an intermediate chamber is formed inside the partition member, while an elastic movable film is disposed between the intermediate chamber and the pressure receiving chamber, and a partition wall portion that separates the intermediate chamber and the equilibrium chamber in the partition member is configured by the movable member. By forming a connecting channel that connects the intermediate chamber and the equilibrium chamber to the movable member, and further disposing the movable plate on the fluid channel of the connecting channel, the movable plate is elastic in the axial direction of the second mounting member. The fixed portion of the second mounting member relative to the vibration isolation target member rather than the movable film It is desirable that allowed to position on the opening side of the person who provided.

  According to such a structure in accordance with this aspect, the position of the movable plate can be set so as to be biased toward the side close to the vibration isolation target member such as the vehicle body (the side opposite to the first mounting member). As a result, when the impact force generated by the contact between the movable plate and the movable member is transmitted to the vibration isolation target member as a moment in the twisting direction, the distance from the position where the impact force is applied to the vibration isolation target member is shortened. This reduces the moment. Therefore, it is possible to reduce or avoid the contact sound transmitted to the vibration isolation target member, thereby realizing an improvement in silence.

  In the fluid-filled vibration isolator according to the present invention, it is desirable that a gap be formed between the assembled rubber elastic body and the second mounting member.

  According to this, it can suppress more effectively that the impact by contact | abutting of a movable plate is transmitted to a 2nd attachment member via an assembly | attachment rubber elastic body. Furthermore, the relative displacement of the partition member with respect to the second mounting member is allowed more smoothly, and the effect of reducing cavitation noise can be obtained more advantageously.

The longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention. The longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an automobile engine mount 10 as a first embodiment of a fluid-filled vibration isolator constructed according to the present invention. The 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 to each other by a main rubber elastic body 16. Yes. In the engine mount 10, the first mounting bracket 12 is attached to a power unit (not shown), and the second mounting bracket 14 is attached to a vehicle body (not shown), so that the power unit and the vehicle body are connected in a vibration-proof manner. It has become. In the following description, the vertical direction means the vertical direction in FIG. 1 which is the vertical vertical direction when the vehicle is mounted, in principle.

  More specifically, the first mounting bracket 12 has a structure in which a substantially cylindrical mounting portion 18 and a flange portion 20 that extends outward in the direction perpendicular to the axis at the upper end edge of the mounting portion 18 are integrally provided. . The mounting portion 18 is formed with a mounting bolt hole 22 that linearly extends on the central axis and opens to the upper end surface, and a thread is threaded on the inner peripheral surface of the bolt hole 22. . The first mounting bracket 12 is attached to the power unit by a mounting bolt (not shown) that is screwed into the bolt hole 22.

  On the other hand, the second mounting bracket 14 has a thin, large-diameter, generally cylindrical shape as a whole, and is a highly rigid member like the first mounting bracket 12. The second mounting bracket 14 has a stepped portion 24 in the middle portion in the axial direction, the upper side being a large diameter cylindrical portion 26 across the stepped portion 24 and the lower side being a small diameter cylindrical portion 28. Yes. Further, a step 30 is provided at the lower end of the small-diameter cylindrical portion 28, and a caulking piece 32 is integrally formed on the lower side across the step 30.

  The first mounting bracket 12 is spaced apart from the upper opening of the second mounting bracket 14, and the main rubber elastic body 16 is disposed between the first mounting bracket 12 and the second mounting bracket 14. It is installed. The main rubber elastic body 16 has a thick, substantially truncated cone shape, and the first mounting bracket 12 is vulcanized and bonded to the end portion on the small diameter side in a substantially embedded state. The end portion is overlapped with the large-diameter cylindrical portion 26 and the step portion 24 of the second mounting bracket 14 and vulcanized and bonded. As a result, the upper opening of the second mounting bracket 14 is closed by the main rubber elastic body 16. In the present embodiment, 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.

  Further, a diaphragm 34 as a flexible film is attached to the integrally vulcanized molded product of the main rubber elastic body 16. The diaphragm 34 is a thin rubber film having a substantially disk shape, and is sufficiently slackened in the axial direction. Further, a contact fitting 36 as a contact member having a substantially annular shape is vulcanized and bonded to the outer peripheral edge portion of the diaphragm 34, and the diaphragm 34 is an integrally vulcanized molded product provided with the contact fitting 36. It is formed as.

  The diaphragm 34 is inserted into a caulking piece 32 provided at the lower end portion of the second mounting bracket 14, and the abutting fitting 36 is caulked and fixed by the caulking piece 32. Further, in the present embodiment, a substantially dish-shaped bracket 37 is disposed below the diaphragm 34 and is caulked and fixed together with the abutting metal fitting 36 by the caulking piece 32. By fixing the bracket 37 to the vehicle body, the second mounting bracket 14 is attached to the vehicle body. The bracket does not necessarily have a dish shape. For example, a cylindrical bracket may be externally fitted to the second mounting bracket 14. Further, the bracket is not essential in the present invention, and the second mounting bracket 14 may be directly fixed to the vehicle body.

  By mounting the diaphragm 34, the upper opening of the cylindrical second mounting bracket 14 is fluid-tightly closed by the main rubber elastic body 16, and the lower opening of the second mounting bracket 14 is closed. Is closed fluid-tightly by the diaphragm 34. As a result, a fluid chamber 38 that is separated from the external space and sealed with an incompressible fluid is formed between the main rubber elastic body 16 and the axially opposed surfaces of the diaphragm 34 on the inner peripheral side of the second mounting bracket 14. Is formed. The incompressible fluid to be enclosed is not particularly limited, but a low-viscosity fluid such as water is desirable in order to efficiently obtain the fluid flow action.

  A partition member 40 is disposed in the fluid chamber 38. The partition member 40 has a thick, generally disc shape as a whole, is disposed so as to extend in the direction perpendicular to the axis within the fluid chamber 38, and is supported by the second mounting member 14.

  As a result, the fluid chamber 38 is divided into two parts in the axial direction up and down across the partition member 40. On the upper side across the partition member 40, a part of the wall portion is constituted by the main rubber elastic body 16, and vibrations are generated. A pressure receiving chamber 42 is formed in which an internal pressure fluctuation is exerted upon input, and a part of the wall portion is formed of a diaphragm 34 on the lower side across the partition member 40 so that a volume change can be easily allowed. A chamber 44 is formed.

  Here, the partition member 40 includes a partition member main body 46. The partition member main body 46 has a thick, generally cylindrical shape as a whole. In this embodiment, the outer peripheral surface of the partition member main body 46 is a tapered surface that gradually decreases in diameter toward the upper side in the axial direction on the pressure receiving chamber 42 side. ing. In addition, a circular center hole 48 penetrating in the axial direction is provided in a central portion in the radial direction of the partition member main body 46, and an inner flange-shaped contact portion 50 is integrally formed at an upper opening edge thereof. ing.

  Furthermore, an upper peripheral groove and a lower peripheral groove are formed on the outer peripheral edge of the partition member main body 46, each extending a little less than one round in the circumferential direction. Then, the upper circumferential groove and the lower circumferential groove communicate with each other in series through the connection hole, so that the concave groove 52 extending in the circumferential direction with a length of a little less than two rounds opens to the outer peripheral surface of the partition member body 46. Is formed. The upper circumferential groove has a smaller cross-sectional area than the lower circumferential groove.

  A movable partition wall 54 as a movable member is disposed in the center hole 48 of the partition member main body 46. The movable partition wall 54 has a substantially hollow disk shape as a whole, and includes a bottom portion 56 having a bottomed cylindrical shape and a lid portion 58 fitted into the opening of the bottom portion 56. Further, a lower through hole 60 is formed through the bottom wall of the bottom portion 56, and an upper through hole 62 is formed through the lid portion 58 at a portion corresponding to the lower through hole 60. Further, a housing space 64 is formed inside the movable partition wall 54, and the housing space 64 is communicated with the pressure receiving chamber 42 through the upper through hole 62 and also into the equilibrium chamber 44 through the lower through hole 60. It is communicated.

  A movable rubber plate 66 as a movable plate is accommodated in the accommodation space 64 of the movable partition wall 54. The movable rubber plate 66 has a substantially disc shape, and has a plate thickness dimension slightly smaller than the axial internal dimension of the accommodation space 64 and a radial internal dimension of the accommodation cavity 64 slightly. Has a small diameter. Further, the hydraulic pressure of the pressure receiving chamber 42 is applied to the upper surface of the movable rubber plate 66 through the upper through hole 62, and the lower surface of the movable rubber plate 66 is balanced through the lower through hole 60. The fluid pressure in the chamber 44 is exerted. The movable rubber plate 66 can be slightly displaced in the axial direction in the accommodation space 64 by the relative pressure fluctuation between the pressure receiving chamber 42 and the equilibrium chamber 44 while being disposed in the accommodation space 64. ing.

  The movable partition wall 54 that houses the movable rubber plate 66 in this way is inserted into the center hole 48 of the partition member main body 46 from below. The movable partition wall 54 is elastically supported by the partition member body 46 via a support rubber elastic body 68. The support rubber elastic body 68 has a substantially annular shape, and is interposed between the abutment portion 50 of the partition member main body 46 and the outer peripheral edge portion of the upper end surface of the movable partition wall 54. The partition member main body 46 is disposed in the center hole 48 so as to be interposed between the inner peripheral surface and the upper edge of the outer peripheral surface of the movable partition wall 54.

  A movable rubber film 70 as an elastic movable film is attached to the partition member main body 46. The movable rubber film 70 has a substantially disk shape as a whole, and a cylindrical support portion 72 that protrudes upward in the axial direction is integrally formed on the outer peripheral edge thereof. Further, a fixed metal fitting 74 is vulcanized and bonded to the outer peripheral edge of the movable rubber film 70. The fixed metal fitting 74 has a substantially annular plate shape as a whole, and has a cylindrical shape whose inner peripheral edge rises upward in the axial direction. Further, the outer diameter dimension of the fixing bracket 74 is slightly smaller than the inner diameter dimension of the second mounting bracket 14 and larger than the outer diameter dimension of the partition member main body 46. The inner peripheral edge portion of the fixed metal fitting 74 is embedded and fixed to a support portion 72 provided on the outer peripheral edge portion of the movable rubber film 70. The fixed metal fitting 74 is superimposed on the lower end surface of the partition member main body 46 and fixed to the partition member main body 46, so that the movable rubber film 70 is attached to the partition member main body 46 and is more balanced than the movable partition wall 54. The lower opening of the center hole 48 of the partition member main body 46 is closed with a movable rubber film 70 on the chamber 44 side (lower side in the axial direction). Further, the upper end surface of the support portion 72 in the movable rubber film 70 is superimposed on the outer peripheral edge portion of the lower end surface of the movable partition wall 54 from below, and the movable partition wall 54 is located between the support rubber elastic body 68 and the support portion 72 in the axial direction. It is pinched elastically. In the present embodiment, a plurality of fitting holes formed through the fixing fitting 74 are engaged with hook-like locking claws that protrude downward from the lower surface of the partition member main body 46, thereby The metal fitting 74 is fixed to the partition member main body 46.

  Further, an annular contact rubber elastic body 76 is fixed to the outer peripheral portion of the fixing metal 74. The contact rubber elastic body 76 is formed so as to protrude downward from the lower surface of the fixing metal 74 and has a cross-sectional shape gradually narrowing in the radial direction downward.

  Further, by attaching the movable rubber film 70 to the partition member main body 46, an intermediate chamber 78 is formed between the movable partition wall 54 and the movable rubber film 70 facing in the axial direction. The intermediate chamber 78 is separated from the pressure receiving chamber 42 by the movable partition wall 54 and is separated from the equilibrium chamber 44 by the movable rubber film 70. The intermediate chamber 78 is filled with an incompressible fluid, similar to the pressure receiving chamber 42 and the equilibrium chamber 44.

  In the present embodiment, the assembly sleeve 80 is externally attached to the partition member main body 46. The assembly sleeve 80 is a thin metal fitting having a substantially cylindrical shape, and in the present embodiment, the assembly sleeve 80 has a tapered shape that gradually decreases in diameter toward the upper side in the axial direction on the pressure receiving chamber 42 side. Further, the assembly sleeve 80 is a locking portion 81 whose upper end is bent and extends radially inward.

  Further, a fitting rubber elastic body 82 is vulcanized and bonded to the inner peripheral surface of the assembly sleeve 80 so as to cover substantially the whole, and the inner peripheral surface of the fitting rubber elastic body 82 is the partition member main body 46. The outer peripheral surface and a tapered surface having an inclination corresponding to the assembly sleeve 80 are used. Further, the upper end portion of the fitting rubber elastic body 82 is fixed to the lower surface of the locking portion 81 in the assembly sleeve 80. Furthermore, a protrusion 83 protruding radially inward is formed at the lower end of the fitting rubber elastic body 82.

  And the partition member main body 46 is inserted with respect to the assembly sleeve 80 from below, and is assembled in the fitted state. In the present embodiment, the partition member main body 46 is brought into contact with the engaging portion 81 of the assembly sleeve 80 via the fitting rubber elastic body 82, so that the partition member main body 46 is attached to the assembly sleeve 80. Is positioned in the axial direction. On the other hand, the outer peripheral edge of the lower end surface of the partition member main body 46 is brought into contact with a protrusion 83 formed integrally with the lower end of the fitting rubber elastic body 82, so that the partition member main body 46 moves downward from the assembly sleeve 80 ( Escape to the equilibrium chamber 44 side) is prevented.

  An assembly rubber elastic body 84 is vulcanized and bonded to the outer peripheral surface of the assembly sleeve 80 so as to cover substantially the entire surface. Further, an elastic support portion 86 that protrudes upward in the axial direction independently of the assembly sleeve 80 is integrally formed at the upper end portion of the assembly rubber elastic body 84. The outer rubber dimension of the assembled rubber elastic body 84 is constant over substantially the entire length in the axial direction. Moreover, in this embodiment, the fitting rubber elastic body 82 and the assembly rubber elastic body 84 are integrally formed, the number of parts is reduced, and the vulcanization molding process is omitted.

  As described above, the partition member 40 in the present embodiment includes the partition member main body 46, the movable partition wall 54, the assembly sleeve 80, the support rubber elastic body 68, the fitting rubber elastic body 82, and the assembly rubber elastic body 84. And the movable rubber film 70. The partition member 40 is inserted into the second mounting bracket 14 and supported by the second mounting bracket 14 in a manner that allows displacement in the axial direction, and is accommodated in the fluid chamber 38. ing.

  More specifically, first, the assembly sleeve 80 of the partition member 40 is inserted into the second mounting bracket 14, and the elastic support portion 86 at the upper end thereof is pivoted with respect to the lower end surface of the main rubber elastic body 16. Make contact in the direction. Next, the partition member main body 46 in which the movable partition wall 54 and the movable rubber film 70 are assembled is inserted and assembled into the assembly sleeve 80 inserted in the second mounting bracket 14. After that, the diaphragm 34 and the bracket 37 are caulked and fixed, so that the fixed metal fitting 74 of the movable rubber film 70 is elastic to the contact metal fitting 36 of the diaphragm 34 in the axial direction via the contact rubber elastic body 76. Abut.

  As a result, the elastic support portion 86, which is the end portion of the assembled rubber elastic body 84 on the pressure receiving chamber 42 side, is in contact with the main rubber elastic body 16, and at the balance chamber 44 side of the contact rubber elastic body 76. The end portion is in contact with an abutting metal fitting 36 fixed to the second mounting metal fitting 14. As a result, the partition member 40 is elastically positioned and held between the main rubber elastic body 16 and the diaphragm 34 in the axial direction, is elastically supported in the axial direction by the second mounting bracket 14, and extends in the axial direction. It is assembled in a state where the relative displacement is allowed. Further, the displacement of the partition member 40 toward the pressure receiving chamber 42 is limited by the elastic contact of the assembled rubber elastic body 84 with the main rubber elastic body 16 and also toward the equilibrium chamber 44 side. The displacement is limited by the elastic contact of the contact rubber elastic body 76 with the contact fitting 36.

  In this embodiment, the axial dimension of the assembled rubber elastic body 84 is larger than the axial dimension of the contact rubber elastic body 76. Further, the assembled rubber elastic body 84 is in contact with the elastic rubber body 16 that is elastically deformable, and the contact rubber elastic body 76 is in contact with the inner peripheral portion of the contact metal fitting 36 that is made hard. Yes. Accordingly, the relative displacement of the partition member 40 with respect to the second mounting member 14 is allowed to be larger on the pressure receiving chamber 42 side than on the equilibrium chamber 44 side.

  In the present embodiment, the outer diameter of the partition member 40, in other words, the outer diameter of the assembled rubber elastic body 84 is smaller than the inner diameter of the small-diameter cylindrical portion 28 of the second mounting bracket 14. In addition, the partition member 40 is disposed coaxially with the second mounting bracket 14. Thereby, a gap is formed between the inner peripheral surface of the second mounting bracket 14 and the outer peripheral surface of the partition member 40. Preferably, the entire inner peripheral surface of the second mounting bracket 14 and the outer peripheral surface of the partition member 40 are separated from each other by the gap. More preferably, the second mounting bracket 14 and the partition member 40 are separated from each other. The separation distance in the radial direction is substantially constant over the entire circumference.

  Further, the outer peripheral side opening of the concave groove 52 formed in the partition member main body 46 is covered fluid-tightly by the assembly sleeve 80 via the fitting rubber elastic body 82. Further, one end portion of the concave groove 52 is communicated with the pressure receiving chamber 42 through the communication hole 88, and the other end portion of the concave groove 52 is communicated with the equilibrium chamber 44 through the communication hole 90. As a result, a first orifice passage 92 that connects the pressure receiving chamber 42 and the equilibrium chamber 44 to each other is formed using the concave groove 52. In the present embodiment, the first orifice passage 92 is tuned to a low frequency corresponding to the engine shake.

  Further, the concave groove 52 communicates with the intermediate chamber 78 through the communication hole 94 at an intermediate portion in the passage length direction. As a result, a second orifice passage 96 communicating with the pressure receiving chamber 42 and the intermediate chamber 78 is formed using the concave groove 52. In the present embodiment, the second orifice passage 96 is tuned to a medium frequency corresponding to idling vibration.

  Further, the movable rubber plate 66 of the partition member 40 is configured such that the hydraulic pressure of the pressure receiving chamber 42 is applied to the upper surface of the movable rubber plate 66 through the upper through hole 62, and the lower through hole 60 to the lower surface of the movable rubber plate 66. Through this, the hydraulic pressure in the intermediate chamber 78 is exerted. Thereby, at the time of vibration input, the movable rubber plate 66 is allowed to be slightly displaced in the axial direction based on the relative pressure fluctuation between the pressure receiving chamber 42 and the intermediate chamber 78.

  Then, the hydraulic pressure transmission action is exhibited by the minute displacement of the movable rubber plate 66, so that the pressure receiving chamber 42 and the intermediate chamber 78 are communicated with each other through the upper and lower through holes 62, 60 and the accommodation space 64. The upper and lower through holes 62 and 60 and the accommodation space 64 form a third orifice passage 98 that communicates the pressure receiving chamber 42 and the intermediate chamber 78. In the present embodiment, the third orifice passage 98 is tuned to a high frequency corresponding to a medium speed traveling boom. The tuning of the first to third orifice passages 92, 96, and 98 is set by the ratio (A / L) of the passage sectional area (A) and the passage length (L).

  When vibration is input in the axial direction while the vehicle engine mount 10 having the structure according to this embodiment is mounted on the vehicle, an effective vibration-proofing effect is exhibited according to the frequency of the input vibration. It has become.

  That is, when a low-frequency large-amplitude vibration corresponding to an engine shake is input, a fluid flow is generated between the pressure receiving chamber 42 and the equilibrium chamber 44 through the first orifice passage 92 tuned to a low frequency. Thereby, based on the resonance action of the fluid flowing through the first orifice passage 92 and the like, the intended anti-vibration effect (high damping effect) is exhibited.

  Note that when the low-frequency large-amplitude vibration corresponding to the engine shake is input, the deformation of the movable rubber film 70 is limited, and the second orifice passage 96 is substantially blocked. Further, the movable rubber plate 66 is restrained by being pressed against the movable partition wall 54, and the hydraulic pressure absorbing action exerted by the minute displacement of the movable rubber plate 66 is prevented. As a result, the pressure fluctuation in the pressure receiving chamber 42 can be efficiently induced, and the amount of fluid flowing through the first orifice passage 92 can be advantageously ensured.

  In addition, when an intermediate frequency medium amplitude vibration corresponding to idling vibration is input, the first orifice passage 92 is substantially blocked by an anti-resonant action. There, the movable rubber film 70 is elastically deformed based on the relative pressure fluctuation between the pressure receiving chamber 42 and the intermediate chamber 78. As a result, fluid flow through the second orifice passage 96 is generated between the pressure receiving chamber 42 and the intermediate chamber 78. As a result, the intended vibration isolation effect (low dynamic spring effect) is exhibited based on the resonance action of the fluid flowing through the second orifice passage 96 and the like.

  Further, at the time of inputting high-frequency small-amplitude vibration corresponding to medium-speed traveling booming noise, both the first orifice passage 92 and the second orifice passage 96 are substantially cut off by anti-resonant action. The movable rubber plate 66 is slightly displaced in the axial direction based on the relative pressure fluctuation between the pressure receiving chamber 42 and the intermediate chamber 78, and the hydraulic pressure in the pressure receiving chamber 42 is transmitted to the intermediate chamber 78. The hydraulic pressure transmitted to the intermediate chamber 78 is released to the equilibrium chamber 44 by elastic deformation of the movable rubber film 70. As a result, fluid flow through the third orifice passage 98 is generated between the pressure receiving chamber 42 and the intermediate chamber 78 so that a vibration isolation effect (low dynamic spring effect) based on the fluid flow action is exhibited. It has become.

  A connection passage that connects the intermediate chamber 78 and the equilibrium chamber 44 to each other using the end portion on the equilibrium chamber 44 side of the first orifice passage 92 and the end portion on the intermediate chamber 78 side of the second orifice passage 96 is provided. It may be set and the connection passage may be tuned to a high frequency corresponding to the traveling noise. According to this, the hydraulic pressure transmitted from the pressure receiving chamber 42 to the intermediate chamber 78 is positively released to the equilibrium chamber 44 through the connection passage, and the low dynamic spring effect can be obtained more advantageously.

  In addition, at the time of vibration input at a higher frequency corresponding to high-speed traveling noise, the elastically supported movable partition wall 54 is slightly displaced in the axial direction by elastic deformation of the support rubber elastic body 68 and the support portion 72 of the movable rubber film 70. To be harassed. An effective anti-vibration effect (low dynamic spring effect) is obtained on the basis of the canceling action exhibited by the movable partition wall 54 being slightly displaced in the resonance state.

  Here, in the automobile engine mount 10 having the structure according to the present embodiment, the movable rubber plate 66 is displaced in the axial direction within the accommodation space 64 and applied to the movable partition wall 54 at the time of vibration input. It is possible to suppress the generated contact sound from being transmitted to the second mounting bracket 14 and thus to the vehicle body side.

  More specifically, when an impact force causing abnormal noise is generated when the movable rubber plate 66 is struck against the movable partition wall 54, first, transmission of the impact force from the movable partition wall 54 to the partition member body 46 is supported. It is reduced by a buffering action based on the elastic deformation of the rubber elastic body 68. Particularly in the present embodiment, since the movable partition wall 54 is elastically supported between the support rubber elastic body 68 and the support portion 72, the transmission of impact force from the movable partition wall 54 to the partition member body 46 is more effectively performed. It has been reduced.

  Next, the impact force transmitted to the partition member body 46 is transmitted to the assembly sleeve 80 via the fitting rubber elastic body 82 interposed between the partition member body 46 and the assembly sleeve 80. Further, the transmission of impact force from the partition member main body 46 to the assembly sleeve 80 is reduced by the buffering action based on the elastic deformation of the fitting rubber elastic body 82.

  Next, the impact force transmitted to the assembly sleeve 80 is applied to the second through the assembly rubber elastic body 84 and the main rubber elastic body 16 or the fitting rubber elastic body 82 and the contact rubber elastic body 76. To the mounting bracket 14. Therefore, an impact reduction effect of the impact force is exhibited by the buffering action based on the elastic deformation of the assembled rubber elastic body 84 and the main rubber elastic body 16 or the fitting rubber elastic body 82 and the contact rubber elastic body 76. It is like that.

  As described above, in the present embodiment, when the impact force caused by the contact between the movable rubber plate 66 and the movable partition wall 54 is transmitted to the second mounting bracket 14, at least three rubber elastic bodies are present on the transmission path. They are arranged in series, and the transmission of impact force is effectively suppressed by the triple buffering action. Therefore, the transmission of the contact sound to the vehicle body can be reduced or avoided, and the quietness and ride comfort of the automobile can be improved.

  Further, the outer peripheral side opening of the concave groove 52 formed in the partition member main body 46 is covered with an assembly sleeve 80 that is assembled to the partition member main body 46 in a fitted state, whereby the first and second Orifice passages 92 and 96 are formed. Thereby, the partition member main body 46 is relatively displaced in the axial direction with respect to the second mounting bracket 14, thereby preventing the fluid-tight cover state of the outer peripheral side opening of the groove 52 from being released, A short circuit between the first and second orifice passages 92 and 96 can be prevented. In addition, the first and second orifice passages 92 and 96 can be formed by using the recessed groove 52 that can be easily formed, and the manufacturing is facilitated, and the first and second orifice passages 92 and 96 are facilitated. Can be formed with a large degree of design freedom.

  In the engine mount 10 according to the present embodiment, the outer peripheral surface of the partition member main body 46 is a tapered surface that gradually becomes smaller in diameter toward the pressure receiving chamber 42 side, and the inner peripheral surface of the fitting rubber elastic body 82. Is a tapered surface corresponding to the outer peripheral surface of the partition member main body 46. Therefore, the partition member main body 46 can be easily inserted into the assembly sleeve 80 by the guide action of the tapered surface, and the manufacture of the engine mount 10 can be facilitated.

  Moreover, the outer peripheral surface of the partition member main body 46 and the inner peripheral surface of the fitting rubber elastic body 82 are stably brought into close contact with each other by the tightening action of the tapered surface, and are formed using the concave grooves 52. The sealability of the wall portions of the first and second orifice passages 92 and 96 can be ensured, and problems such as a short circuit can be avoided.

  The partition member 40 is disposed in a state where relative displacement in the axial direction is allowed with respect to the second mounting member 14. Therefore, when a shocking heavy load is input when the bumps and bumps are overcome and an excessive negative pressure is applied to the pressure receiving chamber 42, the partition member 40 is sucked to the pressure receiving chamber 42 side by the negative pressure. The displacement causes the negative pressure in the pressure receiving chamber 42 to be eliminated as quickly as possible. As a result, cavitation caused by such negative pressure can be prevented and generation of abnormal noise and vibration can be avoided.

  In particular, in this embodiment, the displacement of the partition member 40 toward the pressure receiving chamber 42 is limited by the contact between the assembled rubber elastic body 84 and the main rubber elastic body 16, and to the balance chamber 44 side of the partition member 40. This displacement is limited by the contact between the contact rubber elastic body 76 and the contact fitting 36. As a result, the partition member 40 is easily displaced toward the pressure receiving chamber 42 with soft spring rigidity by the shear deformation of the assembled rubber elastic body 84. On the other hand, the partition member 40 has a non-linear spring characteristic due to the compressive deformation of the abutting rubber elastic body 76, and is easily allowed to be smallly displaced toward the equilibrium chamber 44, and has a large displacement toward the equilibrium chamber 44. It is surely restricted. Accordingly, the effect of reducing the cavitation noise that is exhibited when the partition member 40 is displaced toward the pressure receiving chamber 42 side, and the fluid that is efficiently exhibited by limiting the displacement of the partition member 40 toward the equilibrium chamber 44 side. Both of the anti-vibration effects based on the fluid action can be effectively obtained.

  Moreover, in the present embodiment, the elastic support portion 86 that protrudes upward independently from the assembly sleeve 80 is integrally formed at the upper end portion of the assembly rubber elastic body 84, and the protruding tip of the elastic support portion 86 is formed. The portion is in contact with the main rubber elastic body 16. As a result, the assembled rubber elastic body 84 is elastically deformed with a small force, and the displacement of the partition member 40 toward the pressure receiving chamber 42 is more easily permitted. Therefore, generation of cavitation noise can be effectively avoided.

  Next, FIG. 2 shows an automobile engine mount 100 as a second embodiment of the fluid filled type vibration damping device having a structure according to the present invention. The engine mount 100 includes a partition member 102. In the following description, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  More specifically, the partition member 102 includes a partition member main body 104. The partition member main body 104 has a thick, large-diameter, generally cylindrical shape, and an inner flange-shaped contact portion 50 that projects into the center hole 48 is integrally formed at the lower end in the axial direction. A concave groove 52 extending in the circumferential direction with a predetermined length is formed on the outer peripheral edge of the partition member main body 104. The upper circumferential groove constituting the concave groove has a larger cross-sectional area than the lower circumferential groove. Further, the outer peripheral surface of the partition member main body 104 is a tapered surface that gradually becomes smaller in diameter in the axially downward direction.

  A movable partition wall 106 as a movable member is disposed in the central hole 48 of the partition member main body 104. The movable partition wall 106 has a housing formed by a cover portion 108 having a bottomed cylindrical shape in the opposite direction and a bottom portion 110 fitted in a disc-shaped lower opening of the cover portion 108. An accommodation space 64 is formed in the interior. Furthermore, a plurality of upper through holes 62 are formed through the upper bottom wall portion of the lid portion 108, and a plurality of lower through holes 60 are formed through the bottom portion 110. Further, a disc-shaped movable rubber plate 66 is accommodated in the accommodating space 64 so as to spread in the direction perpendicular to the axis.

  The movable partition wall 106 having such a structure is elastically supported by the abutting portion 50 through the supporting rubber elastic body 112 at the outer peripheral edge of the lower surface. The support rubber elastic body 112 has a substantially annular shape, and is interposed between the abutting portion 50 of the partition member main body 104 and the outer peripheral edge of the upper end surface of the movable partition wall 106. The partition member main body 104 is disposed in the center hole 48 so as to be interposed between the inner peripheral surface and the lower end edge of the outer peripheral surface of the movable partition wall 106.

  In addition, a movable rubber film 114 as an elastic movable film is assembled to the partition member main body 104. The movable rubber film 114 has a substantially disk shape, and is integrally formed with a support portion 116 that protrudes downward in a cylindrical shape on the outer peripheral edge portion. Further, a fixing bracket 118 having a substantially annular plate shape and integrally formed with a cylindrical fixing portion at the inner peripheral edge portion is vulcanized and bonded to the support portion 116. The support portion 116 of the movable rubber film 114 is fitted into the center hole 48 of the partition member main body 104, and the fixing bracket 118 is overlapped and locked on the upper surface of the partition member main body 104, whereby the movable rubber film 114 is It is attached to the partition member main body 104. Further, when the movable rubber film 114 is attached to the partition member main body 104, the support portion 116 is brought into contact with the outer peripheral edge of the upper surface of the movable partition wall 106, so that the movable partition wall 106 is supported by the support rubber elastic body 112 and the movable rubber film 114. The support portion 116 is elastically supported.

  Further, the upper opening of the center hole 48 of the partition member main body 104 is closed by the movable rubber film 114, so that an intermediate chamber is provided between the movable partition wall 106 and the movable rubber film 114 in the axial direction on the inside of the partition member 102. 78 is formed.

  Here, an assembly sleeve 120 is assembled to the partition member main body 104. The assembly sleeve 120 has a substantially circular cylindrical shape as a whole, and has a tapered shape corresponding to the outer peripheral surface of the partition member main body 104. Further, a locking portion 122 that protrudes toward the inner periphery over the entire circumference is integrally formed at the lower end of the assembly sleeve 120.

  Further, the fitting rubber elastic body 124 is vulcanized and bonded to the inner peripheral surface of the assembly sleeve 120. The fitting rubber elastic body 124 is a thin rubber layer having a substantially tapered cylindrical shape corresponding to the assembling sleeve 120 and is formed so as to cover almost the entire inner peripheral surface of the assembling sleeve 120. ing. Further, an annular protrusion 83 protruding toward the inner peripheral side is integrally formed at the upper end portion of the fitting rubber elastic body 124.

  An assembly rubber elastic body 126 is integrally formed on the outer peripheral surface of the assembly sleeve 120. The assembled rubber elastic body 126 has a cylindrical surface whose outer peripheral surface extends in the axial direction, and is gradually thickened downward in the axial direction. Further, an annular elastic support portion 128 is integrally formed at the lower end portion of the assembled rubber elastic body 126 and protrudes downward. In the present embodiment, the fitting rubber elastic body 124 and the assembly rubber elastic body 126 are integrally formed, and the surface of the assembly sleeve 120 covers substantially the entire surface excluding the lower surface and the inner peripheral surface of the locking portion 122. Covered with rubber elastic.

  Then, the partition member main body 104 is fitted into the assembly sleeve 120 from the upper side in the axial direction, and the outer peripheral surface of the partition member main body 104 is supported by the assembly sleeve 120 via the fitting rubber elastic body 124, whereby the partition member The main body 104 is assembled to the assembly sleeve 120. Thereby, the partition member 102 in this embodiment is formed. In addition, the partition member 102 in the present embodiment has a structure in which the partition member 40 in the first embodiment is turned upside down.

  The partition member 102 having such a structure is assembled to the second mounting bracket 14. That is, the partition member 102 is inserted into the second mounting member 14 with a predetermined gap, while the lower end surface of the elastic support portion 128 in the assembly rubber elastic body 126 fixed to the assembly sleeve 120 is While being in contact with the upper surface of the contact metal fitting 36, the outer peripheral edge portion of the fixing metal fitting 118 fixed to the partition member main body 104 is overlapped with the lower end surface of the main rubber elastic body 16. Thus, the partition member 102 is elastically supported between the main rubber elastic body 16 and the contact fitting 36 in the axial direction. In the present embodiment, the pressure receiving chamber 42 and the intermediate chamber 78 are partitioned by the movable rubber film 114, and the intermediate chamber 78 and the equilibrium chamber 44 are partitioned by the movable partition wall 106.

  A first orifice passage 92 communicating with the pressure receiving chamber 42 and the equilibrium chamber 44 is formed by using the concave groove 52, and a second orifice passage 96 communicating with the pressure receiving chamber 42 and the intermediate chamber 78 is communicated. It is formed using the hole 94. A third orifice passage 98 as a connection flow path is formed by using the upper and lower through holes 62 and 60 and the accommodation space 64, and the intermediate chamber 78 and the equilibrium chamber 44 are formed in the third orifice passage 98. It is communicated by. Further, a movable rubber plate 66 is disposed on the fluid flow path of the third orifice passage 98 so as to spread substantially perpendicular to the passage length direction.

  Under the arrangement of the partition member 102 as described above, the pressure of the pressure receiving chamber 42 is applied to the upper surface of the movable rubber film 114, and the pressure of the intermediate chamber 78 is applied to the lower surface of the movable rubber film 114. When high frequency vibration is input, the movable rubber film 114 is slightly deformed by the relative pressure fluctuation between the pressure receiving chamber 42 and the intermediate chamber 78, and the hydraulic pressure transmission action is performed between the pressure receiving chamber 42 and the intermediate chamber 78. It has come to be demonstrated.

  On the other hand, the pressure of the intermediate chamber 78 is exerted on the upper surface of the movable rubber plate 66, and the pressure of the equilibrium chamber 44 is exerted on the lower surface of the movable rubber plate 66. When intermediate or high frequency vibration is input, the movable rubber plate 66 is slightly displaced by the relative pressure fluctuation between the intermediate chamber 78 and the equilibrium chamber 44, and hydraulic pressure is transmitted between the intermediate chamber 78 and the equilibrium chamber 44. The effect is to be demonstrated. Thus, the fluid flow through the second orifice passage 96 is effectively generated when medium frequency vibration is input, and the fluid flow through the third orifice passage 98 is effectively generated when high frequency vibration is input. It is supposed to be.

  Here, in the engine mount 100 according to the present embodiment, the movable partition wall 106 that houses the movable rubber plate 66 is disposed below the movable rubber film 114 in the axial direction. In other words, the movable rubber plate 66 and the movable partition wall 106 are disposed closer to the vehicle body than the movable rubber film 114 in the axial direction of the second mounting member 14. In other words, the axial distance from the movable rubber plate 66 to the mounting position of the second mounting bracket 14 on the vehicle body side is from the movable rubber film 114 to the mounting position of the second mounting bracket 14 on the vehicle body side. Is set smaller than the axial distance.

  When low-frequency large-amplitude vibration corresponding to engine shake is input while the engine mount 100 having such a structure is mounted on the vehicle, fluid flow through the first orifice passage 92 is generated, and fluid flow The anti-vibration effect based on the action is exhibited. At the time of inputting low-frequency large-amplitude vibration, both the minute deformation of the movable rubber film 114 and the minute displacement of the movable rubber plate 66 are prevented, and the second and third orifice passages 96 and 98 are used. The fluid flow is restricted.

  Further, when a medium frequency vibration corresponding to idling vibration is input, a fluid flow through the second orifice passage 96 is generated, and an anti-vibration effect based on the fluid flow action is exhibited. At the time of vibration input at medium frequency, the first orifice passage 92 is substantially blocked by anti-resonance, and the elastic deformation of the movable rubber film 114 is restricted, so Direct fluid flow through the three orifice passages 98 is prevented.

  When a high-frequency vibration equivalent to a medium-speed traveling boom sound or lockup boom noise is input, fluid flow through the third orifice passage 98 is caused by minute deformation of the movable rubber film 70 and minute displacement of the movable rubber plate 66. As a result, an anti-vibration effect based on the fluid flow action is exhibited. Note that when high frequency vibration is input, the first and second orifice passages 92 and 96 are substantially cut off by anti-resonance.

  In addition, when a vibration with a higher frequency corresponding to a high-speed traveling booming sound is input, a counteracting damping action due to a minute displacement of the movable partition wall 106 is exerted, and the intended low dynamic spring effect can be effectively obtained. .

  Also in the engine mount 100 structured according to the present embodiment, the hitting sound caused by the contact of the movable rubber plate 66 is transmitted to the second mounting bracket 14 as in the engine mount 10 of the first embodiment. This can be reduced by a plurality of rubber elastic bodies disposed on the transmission path.

  Here, in the automobile engine mount 100 having the structure according to the present embodiment, the movable partition wall 106 including the movable rubber plate 66 is disposed below the movable rubber film 114. In other words, the movable partition wall 106 is disposed at a position close to the vehicle body. Thereby, it is possible to more effectively prevent the hitting sound generated when the movable rubber plate 66 hits the movable partition wall 106 from being transmitted to the vehicle body side. That is, the impact force generated by the contact between the movable rubber plate 66 and the movable partition wall 106 is transmitted to the vehicle body side by the displacement of the second mounting bracket 14 in the swing direction. Then, the transmission position of the vibration due to the contact of the movable rubber plate 66 to the second mounting bracket 14 is brought close to the vehicle body, so that the amplitude of the vibration is on the path through which the vibration is transmitted to the vehicle body. Amplification due to the shake of the second mounting bracket 14 can be suppressed. Thereby, the abnormal noise resulting from the impact force transmitted to the vehicle body side is reduced.

  Although several embodiments of the present invention have been described above, these are merely examples, and the present invention is not construed as being limited to specific descriptions in such embodiments.

  For example, in the first and second embodiments, the partition member 40 (102) is formed by the caulking and fixing of the abutting metal fitting 36 of the diaphragm 34 to the second attaching metal fitting 14, thereby Although the elastic body 16 is elastically supported between the axial directions of the main rubber elastic body 16, the partition member is not necessarily attached to the second attachment member by caulking and fixing the flexible membrane to the second attachment member. It does not have to be due to. Specifically, for example, after an annular or cylindrical contact fitting fixed to the outer peripheral edge of the flexible film is inserted into the second mounting member, the diameter of the second mounting member is reduced. Thus, the partition member can be elastically supported between the main rubber elastic body and the flexible film by fitting and fixing the contact fitting to the second mounting member.

  In the first and second embodiments, the outer peripheral surface of the assembled rubber elastic body 84 (126), which is the outer peripheral surface of the partition member 40 (102), is relative to the inner peripheral surface of the second mounting bracket 14. Thus, a gap is formed between the outer peripheral surface of the assembled rubber elastic body 84 (126) and the inner peripheral surface of the second mounting member 14. However, the outer peripheral surface of the assembled rubber elastic body 84 (126) and the inner peripheral surface of the second mounting bracket 14 may be in a contact state (zero touch) that does not exert a contact pressure with each other, or a partition member. 40 (102) may be brought into contact with tightening that is weak enough to allow an axial displacement.

  A rubber layer may be formed so as to cover the inner peripheral surface of the second mounting member. In this case, it is desirable that the outer peripheral surface of the partition member and the inner peripheral surface of the rubber layer are separated from each other, or in a contact state in which no contact pressure is exerted on each other.

  In the first and second embodiments, the gap formed between the second mounting bracket 14 and the partition member 40 (102) has a substantially constant radial width dimension over the entire circumference. However, the gap does not necessarily have to be provided uniformly over the entire circumference. For example, the second mounting bracket 14 and the partition member 40 (102) are partially in contact with each other in a zero-touch state on the circumference, and the radial width dimension changes in the circumferential direction in other portions on the circumference. A gap may be formed. According to this, relative positioning of the second mounting bracket 14 and the partition member 40 (102) in the direction perpendicular to the axis is performed by the contact portion between the second mounting bracket 14 and the partition member 40 (102). Thus, the partition member 40 (102) is stably displaced relative to the second mounting member 14 in the axial direction. In addition, since the second mounting bracket 14 and the partition member 40 (102) are not in contact with each other, the frictional resistance acting between the second mounting bracket 14 and the partition member is reduced. Thus, the relative displacement in the axial direction of the partition member 40 (102) with respect to the second mounting bracket 14 can be easily generated.

  In the first embodiment, the assembly sleeve 80 has a tapered shape with a gradually decreasing diameter toward the pressure receiving chamber 42 side. However, the assembly sleeve has, for example, a substantially constant diameter in the axial direction. The extending cylindrical shape may be sufficient. Further, in the first embodiment, the outer peripheral surface of the partition member main body 46 is a tapered surface that gradually becomes smaller in diameter toward the pressure receiving chamber 42 side, and the inner peripheral surface of the fitting rubber elastic body 82 is the partition member. Although tapered surfaces corresponding to the outer peripheral surface of the main body 46 are formed, these surfaces may not be tapered, and may be cylindrical surfaces extending in the axial direction without being inclined.

  Furthermore, in the second embodiment, the outer peripheral surface of the partition member main body 104 is a tapered surface that gradually increases in diameter toward the pressure receiving chamber 42 side. Similarly to the partition member main body 46 shown in the embodiment, it may be a tapered surface that gradually becomes smaller in diameter toward the pressure receiving chamber 42 side. Accordingly, the assembly sleeve 120 may also have a tapered shape that gradually becomes smaller in diameter toward the pressure receiving chamber 42, similar to the assembly sleeve 80.

  In the first and second embodiments, the fitting rubber elastic body 82 (124) and the assembly rubber elastic body 84 (126) are integrally formed to reduce the number of parts. The fitting rubber elastic body 82 (124) and the assembly rubber elastic body 84 (126) and the assembly rubber elastic body 84 (126) are vulcanized and molded independently of each other, so that the fitting rubber elastic body 82 (124) and the assembly rubber elastic body 84 ( The spring stiffness of 126) can be varied. According to this, it becomes possible to tune the resonance frequency of the partition member 40 (102) and the resonance frequency of the partition member body 46 (104) so as to be different from each other. Therefore, the anti-vibration effect due to the resonance phenomenon of the partition member 40 (102) can be exhibited in a plurality of frequency ranges or a wide frequency range, and the anti-vibration performance can be improved. As the vibration isolation effect due to the resonance phenomenon of the partition member 40 (102), for example, the low dynamic spring effect by absorbing the pressure fluctuation of the pressure receiving chamber 42 by the displacement of the partition member 40 (102), A high damping effect or a low dynamic spring effect can be expected by increasing the pressure fluctuation by the displacement of the partition member 40 (102) to increase the fluid flow amount of the first and second orifice passages 92 and 96.

  In the first embodiment, the partition member 40 has the rubber elastic body 84 in contact with the main rubber elastic body 16 on the upper side in the axial direction and the rubber elastic body 76 on the lower side in the axial direction. By abutting against the abutting metal fitting 36, the second mounting metal 14 is elastically supported. However, for example, the partition member may be supported by the second mounting member by contact of the assembled rubber elastic body 84 on both sides in the axial direction.

  In the first and second embodiments, the movable rubber film 70 (114) is provided, and the intermediate chamber 78 is formed between the opposed surfaces of the movable partition wall 54 (106) and the movable rubber film 70 (114). The structure is shown. However, the movable rubber film 70 (114) is not essential, and the pressure receiving chamber 42 and the equilibrium chamber 44 may be partitioned by the movable partition wall 54 (106). Further, as is clear from this, the intermediate chamber 78 may not be provided, and the second orifice passage 96 that connects the pressure receiving chamber 42 and the intermediate chamber 78 may not be provided.

  In the first and second embodiments, examples in which the present invention is applied to an engine mount for automobiles are shown, but the scope of application of the present invention is not limited to those shown in the above embodiments. . Specifically, for example, the present invention is not only applied to automobiles but is also preferably applied to a fluid-filled vibration isolator for trains and the like. Further, for example, the present invention is not only applicable to engine mounts, but can also be suitably applied to body mounts, subframe mounts, and the like.

10, 100: Engine mount, 12: First mounting bracket, 14: Second mounting bracket, 16: Rubber elastic body, 34: Diaphragm, 36: Abutment bracket, 40, 102: Partition member, 42: Pressure receiving Chamber, 44: equilibrium chamber, 46, 104: partition member body, 48: center hole, 52: concave groove, 54, 106: movable partition, 60: lower through hole, 62: upper through hole, 66: movable rubber plate 68, 112: support rubber elastic body, 70, 114: movable rubber film, 76: contact rubber elastic body, 78: intermediate chamber, 80, 120: assembly sleeve, 82, 124: fitting rubber elastic body, 84 126: assembly rubber elastic body, 86, 128: elastic support portion, 92: first orifice passage, 96: second orifice passage

Claims (8)

The first mounting member and the cylindrical second mounting member are connected by a main rubber elastic body, and one opening of the second mounting member is closed by the main rubber elastic body. The other opening of the mounting member is closed with a flexible membrane to form a fluid chamber in which an incompressible fluid is sealed between the opposing surfaces of the main rubber elastic body and the flexible membrane, and the fluid chamber A partition member is disposed on and supported by the second mounting member, and a pressure receiving chamber composed of the main rubber elastic body is formed on one side of the partition member while sandwiching the partition member. In the fluid-filled vibration isolator in which an equilibrium chamber composed of the flexible film is formed on the other side of the wall portion, and the pressure receiving chamber and the equilibrium chamber communicate with each other by an orifice passage.
A movable member is disposed in the center hole of the cylindrical partition member body, and the movable member is elastically supported by the partition member body via a support rubber elastic body, and the movable plate is accommodated in the movable member so as to be displaceable. Arranged so that the pressure on the pressure receiving chamber side and the pressure on the equilibrium chamber side are exerted on one surface of the movable plate through a through hole provided in the movable member, while the outer periphery of the partition member body A concave groove is formed on the surface, an assembly sleeve is externally attached to the partition member main body, and is assembled to the outer peripheral surface of the partition member main body in a fitted state via a fitting rubber elastic body. By covering with a sleeve to form the orifice passage, the partition member is configured to include the partition member body, the movable member, the movable plate, and the assembly sleeve, and the partition member is used as the second mounting member. Accommodates and displaces in the axial direction. In addition, an assembly rubber elastic body is provided on the outer peripheral surface of the assembly sleeve in the partition member, and the partition member body is axially disposed with respect to the second mounting member using the assembly rubber elastic body. A fluid-filled vibration isolator characterized by being elastically supported.   The amount of axial displacement of the partition member relative to the second mounting member is limited by elastic contact with the main rubber elastic body on the pressure receiving chamber side, while on the equilibrium chamber side The fluid-filled vibration isolator according to claim 1, wherein the fluid-filled vibration isolator is limited by elastic contact with a contact member fixed to the second mounting member.   On the outer peripheral surface of the assembly sleeve, the axial end portion of the assembly rubber elastic body on the pressure receiving chamber side is in contact with the main rubber elastic body, while the partition member main body is on the equilibrium chamber side. The fluid-filled vibration isolator according to claim 2, wherein the fluid-filled vibration isolator is supported in contact with the contact member in the axial direction via a contact rubber elastic body.   On the outer peripheral surface of the assembly sleeve, the axial end portion of the assembly rubber elastic body on the equilibrium chamber side is in contact with the contact member, while the partition member body is on the pressure receiving chamber side. The fluid-filled vibration isolator according to claim 2, which is in axial contact with the main rubber elastic body.   The outer peripheral surface of the partition member body has a tapered shape with a gradually decreasing diameter toward one of the pressure receiving chamber and the equilibrium chamber, and the inner peripheral surface of the fitting rubber elastic body is the partition The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein the fluid-filled vibration isolator is a tapered surface corresponding to the outer peripheral surface of the member main body.   An elastic movable film is provided that fluidly closes the central hole of the partition member on either the pressure receiving chamber side or the equilibrium chamber side with respect to the movable member, and between the movable member and the elastic movable film. The fluid-filled type according to any one of claims 1 to 5, wherein an intermediate chamber is formed in the first chamber, and a second orifice passage is formed to communicate the intermediate chamber with either the pressure receiving chamber or the equilibrium chamber. Anti-vibration device.   The first mounting member is spaced apart from one opening side of the second mounting member, and the fixing portion of the second mounting member with respect to the vibration isolation target member is the first mounting member of the second mounting member. The pressure receiving chamber is formed on the first mounting member side with the partition member sandwiched in the axial direction of the second mounting member, and the equilibrium chamber is formed on the opposite side. And forming the intermediate chamber in the partition member, while disposing the elastic movable film between the intermediate chamber and the pressure receiving chamber, and in the partition member, the intermediate chamber and the equilibrium chamber. A partition portion that separates the center chamber from the movable member is formed by the movable member, and a connecting flow path that connects the intermediate chamber and the equilibrium chamber is formed in the movable member, and the movable plate is disposed on the fluid flow path of the connecting flow path By doing so, the movable plate is moved by the elastic movable membrane in the axial direction of the second mounting member. Fluid-filled vibration damping device according to claim 6 in which the fixed portion to-proof damping subject member of the second mounting member is brought located on the opening side of the person who provided also.   The fluid-filled vibration isolator according to any one of claims 1 to 7, wherein a gap is formed between the assembled rubber elastic body and the second mounting member.

Images