JP2017096480A - Fluid filled vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid filled vibration control device including an amplitude dependency type valve means having a new structure capable of effectively restricting occurrence of irregular sound or shock caused by elastic deformation of the valve-like rubber protrusions constituting such an amplitude dependency type valve means while avoiding bad influence against vibration control performance as much as possible.SOLUTION: This invention relates to a fluid filled vibration control device 10 constituted in such a way that an opening edge part positioned at an opposite side of a communication passage 96 in respect to a valve-like rubber protrusion 98 is integrally formed with a plurality of shock absorbing protrusions 104 protruded on the same plane as that of the rubber protrusions 98 at a rubber elastic plate 94 and protruded at a lower height than that of the valve-like rubber protrusions 98 and at the same time, protrusion heights of the impact protrusions 104 are different in a direction of slits of the communication passage 96 and there are provided impact protrusions 104 of which protrusion heights are higher than those of both end portions 108, 108 at central portions 106 in the directions of the slits at the communication passage 96.SELECTED DRAWING: Figure 2

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 utilizes an anti-vibration effect based on a fluid action of a fluid enclosed inside.

  2. Description of the Related Art Conventionally, an anti-vibration coupling body or an anti-vibration device as an anti-vibration support body that is interposed between members constituting a vibration transmission system such as an automobile power unit and a vehicle body is known. Generally, such an anti-vibration device includes a first mounting bracket attached to one member constituting the vibration transmission system and a second mounting bracket attached to the other member constituting the vibration transmission system. It has a structure that is elastically connected by a rubber elastic body. As one type of vibration isolator, a fluid-filled vibration isolator using a flow action of an incompressible fluid sealed inside has also been proposed. For example, a fluid-filled vibration isolator can be used when a vibration is input, such as a pressure receiving chamber in which a part of a wall is made of a rubber elastic body and a balance chamber in which a part of a wall is made of a flexible film. A plurality of fluid chambers in which relative pressure fluctuations are caused are connected to each other through an orifice passage.

  By the way, in the fluid-filled vibration isolator, the vibration isolation effect based on the resonance action of the fluid is exerted against the vibration of the frequency at which the orifice passage is tuned in advance, while the frequency of the orifice passage is out of the tuning frequency. There is a problem that it is difficult to obtain an effective anti-vibration effect against vibration. In particular, when vibration is input in a frequency range higher than the tuning frequency of the orifice passage, the orifice passage is substantially cut off by an anti-resonance action, so that a significant deterioration in vibration-proof performance due to the high dynamic spring becomes a problem.

  In view of this, the present applicant, in Japanese Patent No. 5432132 (Patent Document 1) and the like, provides a communication path tuned to a higher frequency side than the orifice passage between the fluid chambers, and exhibits the vibration-proof effect by the orifice passage. We proposed a vibration isolator equipped with an amplitude-dependent valve that closes the communication path when large amplitude vibration is input. Such valve means is, for example, a valve-like rubber projection that protrudes on the opposite surfaces of both side openings of a slit-like communication passage having a predetermined width provided on a rubber elastic plate arranged in a partition wall that partitions a plurality of fluid chambers. Are formed integrally with each of the opposing opening edges. When a large amplitude vibration is input, the valve-like rubber protrusion is elastically deformed toward the opening of the communication path by the fluid pressure generated by the vibration input, thereby substantially closing the communication path.

  However, in a fluid-filled vibration isolator equipped with such an amplitude-dependent valve means, the valve-like rubber protrusion is connected when the valve-like rubber protrusion elastically deforms and closes the communication path when a large amplitude vibration is input. Hit the edge of the aisle on the opposite shore. For this reason, for example, when an excessive shock load is input, such as cranking vibration of the engine, the valve-like rubber protrusions strike the edge of the communicating path on the opposite shore side vigorously. There was a risk of causing (vibration).

  For such a problem, it is also conceivable to suppress the impact generated by softening the valve-like rubber protrusion. However, if the valve-like rubber protrusions are softened, the amount of deformation that the valve-like rubber protrusions enter into the communication path when large amplitude vibration is input increases, causing the fluid chamber pressure to escape and fluid flow through the orifice passage. This is not an effective solution because the amount is reduced and it becomes difficult to obtain the desired vibration isolation effect.

Japanese Patent No. 5432132

  Here, the present invention has been made in the background as described above, and the problem to be solved is a fluid-filled vibration isolator having amplitude-dependent valve means, While avoiding adverse effects on vibration performance as much as possible, it is possible to effectively suppress the occurrence of abnormal noise or impact due to striking at the time of elastic deformation of the valve-like rubber projections constituting such amplitude-dependent valve means An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure.

  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.

  According to a first aspect of the present invention, a first fluid chamber and a second fluid chamber are provided in which a relative pressure change is caused by vibration input, and the first fluid chamber and the second fluid chamber are provided. The chamber is connected by an orifice passage, and a slit-like communication passage having a predetermined width is provided on a rubber elastic plate disposed in a partition wall that partitions the first fluid chamber and the second fluid chamber. While being tuned to a higher frequency side than the passage, both side opening portions of the communication passage are integrally formed with respective opening edge portions of the rubber elastic plates protruding on opposite sides of the rubber elastic plate. And a hollow groove extending along the valve-like rubber protrusion on the opposite side of the communication path is formed on the base end side of each valve-like rubber protrusion on the rubber elastic plate. The rubber protrusion is elastically deformed toward the opening of the communication path by fluid pressure due to vibration input. In the fluid-filled vibration isolator having an amplitude-dependent valve means for closing the communication path, an opening edge located on the opposite side of the communication path with respect to the valve-like rubber protrusion is provided with the rubber elasticity A plurality of buffer projections projecting on the same surface of the plate as the valve-like rubber projection and at a height smaller than the valve-like rubber projection are integrally formed, and the projection height of the buffer projection is the slit of the communication path. The buffer projections are different from each other in the direction of the slit, and are provided at the central portion in the slit direction of the communication path, the buffer projections being higher than the both end portions.

  In the fluid-filled vibration isolator constructed according to this aspect, the rubber-like rubber protrusion is elastically deformed so as to fall toward the opening side of the communication path by the input of large amplitude vibration, and the opening of the communication path is closed so as to close the opposite shore. When hitting the opening edge on the side, the impact is alleviated by contact with the buffer protrusion. In particular, a plurality of cushioning protrusions are provided and have a plurality of vertices at different heights as a whole, so it is excellent that the valve-like rubber protrusions abut at a plurality of locations and the abutting area gradually increases. The shock absorbing action is demonstrated.

  That is, according to the buffer protrusion of this aspect, since the area hitting first is reduced, the deformation rigidity is reduced and excellent shock absorption is exhibited. Therefore, the valve-like rubber protrusion and the buffer protrusion Can be obtained even with a valve-like rubber protrusion and a buffer protrusion integrally formed on the rubber elastic plate, without forming them separately with a special soft material different from the rubber elastic plate. Moreover, such excellent shock absorption is achieved by the buffer protrusion having a specific structure according to the present invention, and the valve-like rubber protrusion can be maintained without changing its shape and characteristics. The intended vibration-proof performance that is exhibited based on specific properties such as the elastic properties of the rubber protrusions is not impaired.

  Furthermore, since the protrusion height of the buffer protrusion is increased on the center side in the direction in which the slit extends along the opening edge of the communication path, a more excellent buffer action is exhibited when the valve-like rubber protrusion contacts. The Rukoto. That is, the valve-like rubber protrusion protruding from the opening edge of the communication passage is formed with a cutout groove behind it, so that the substantial protrusion height of the rubber elastic plate is equal to the depth of the cutout groove. Although it is larger than the protruding height from the surface, both end portions of the valve-like rubber protrusion are integrally connected to the surface height of the rubber elastic plate because there is no side wall groove at both ends of the slit. It is almost restrained. Therefore, the elastic deformation generated in the valve-like rubber protrusion by the input of the large amplitude vibration tends to be larger at the center portion where the valve-like rubber protrusion is easily deformed than both end portions. Therefore, by increasing the protruding height of the buffer protrusion that the central portion abuts and making it contact the buffer protrusion earlier than the both side portions, the elastic deformation amount and the momentum of deformation of the central portion do not become too large. Thus, the elastic deformation of the valve-like rubber protrusion can be suppressed in a buffering manner. Further, both end portions of the valve-like rubber protrusion are also brought into contact with the buffer protrusion after that, so that the elastic deformation energy of the valve-like rubber protrusion is absorbed in a buffer with a longer buffering time, and abnormal noise accompanying the contact is absorbed. And impact can be effectively suppressed.

  According to a second aspect of the present invention, there is provided the fluid-filled vibration isolator according to the first aspect, wherein the plurality of buffer protrusions have a wave shape having continuously different heights in the slit direction of the communication path. It is what has been.

  In the fluid filled type vibration isolator having the structure according to this aspect, the plurality of buffer protrusions are formed with a substantially continuous structure as a whole, and the height dimension of the buffer protrusion changes as a whole in the length direction of the slit. Therefore, when the valve-like rubber protrusion is elastically deformed and comes into contact with the tip portion of the buffer protrusion, the contact area (contact area or contact length) increases substantially continuously. Therefore, the buffering action at the time of contact of the valve-like rubber protrusion is more effectively exhibited. In addition, the buffer protrusions are formed in an integral structure as compared with a plurality of buffer protrusion structures formed independently of each other, so that the stress and deformation of the buffer protrusions are dispersed and the durability of the buffer protrusions is improved. Can be.

  A third aspect of the present invention is the fluid-filled vibration isolator according to the first or second aspect, wherein the rubber elastic plate has an inner surface facing the valve-like rubber protrusion in the lightening groove. The buffer protrusions extending in the depth direction are integrally formed.

  In the fluid-filled vibration isolator constructed according to this aspect, when the valve-like rubber protrusion repeatedly elastically deforms when a large amplitude vibration is input, it is elastically deformed so that it falls down to the side of the hollow groove opposite to the passage side However, abnormal noise and impact caused by the impact of the valve-like rubber protrusions against the opposing side wall surfaces of the lightening groove can be mitigated by the buffer protrusions provided on the inner surface of the lightening groove.

  A fourth aspect of the present invention is the fluid-filled vibration isolator according to any one of the first to third aspects, wherein the valve-like rubber protrusion and the buffer protrusion are parallel to each other in the same direction. It is what is projected.

  In the fluid-filled vibration isolator having the structure according to this aspect, the opening portion of the communication path formed between the opposing surfaces of the valve-like rubber protrusion and the buffer protrusion has a substantially constant channel cross section and is straight from the communication path. It is formed in a manner that extends. Therefore, the adverse effect on the fluid flow through the communication path due to the provision of the buffer projections can be avoided more effectively, and the anti-vibration effect such as the low dynamic spring effect by the fluid flow through the communication path can be improved. Can be illustrated.

  According to a fifth aspect of the present invention, there is provided the fluid filled type vibration damping device according to any one of the first to fourth aspects, wherein the rubber elastic plate is a hard partition member around a portion where the communication path is formed. The partition is configured by being supported by sandwiching both sides thereof.

  In the fluid-filled vibration isolator having the structure according to this aspect, since the rubber elastic plate is restrained by the partition member, the rubber elasticity at a position outside the communication passage, the valve-like rubber protrusion, and the buffer protrusion is formed. Due to the elastic deformation of the plate, the communication path, the valve-like rubber protrusion, and the buffer protrusion may be inadvertently deformed, etc., and the target characteristics may not be stably exhibited. Can be avoided.

  According to a sixth aspect of the present invention, there is provided the fluid filled type vibration damping device according to any one of the first to fifth aspects, wherein the valve-like rubber protrusion and the opening are provided on the opening portions on both sides of the rubber elastic plate. The rubber elastic plate is formed with a plurality of the communication passages that are provided with respective buffer protrusions, and the rubber elastic plates are sandwiched on both sides by hard partition members around the portions where the communication passages are formed. The partition is constituted by being supported.

  In the fluid filled type vibration isolator having the structure according to this aspect, a plurality of slit-like communication paths can be formed efficiently and with a simple structure using a common rubber elastic plate, and the vibration isolation characteristics The degree of freedom in tuning can be improved.

  As is clear from the above description, in the fluid-filled vibration isolator having the structure according to the present invention, the valve-like rubber protrusion has almost no adverse effect on the vibration-proof characteristics realized by the communication path and the valve-like rubber protrusion. Problems such as abnormal noise and impact caused by the hitting of the rubber can be effectively eliminated with a simple structure by the buffer protrusion having a specific structure integrally formed with the rubber elastic plate.

1 is a longitudinal sectional view of a fluid filled type vibration damping device as one embodiment of the present invention. The perspective view of the rubber elastic board which comprises the fluid enclosure type vibration isolator shown by FIG. The perspective view from the bottom face side of the rubber elastic board shown by FIG. The perspective view from another angle of the bottom face side in the rubber elastic board shown by FIG. The top view of the rubber elastic board shown by FIG. The bottom view of the rubber elastic board shown by FIG. The right view of the rubber elastic board shown by FIG. VIII-VIII sectional drawing in FIG. It is a figure which expands and shows the principal part in the longitudinal cross-section of the rubber elastic board shown by FIG. 8, Comprising: (a) shows the state which the valve-shaped rubber protrusion contact | abutted to the front-end | tip part of the buffer protrusion, and (b ) Shows a state in which the valve-like rubber protrusion is further elastically deformed from the state of (a) and overlaps the inner surface of the buffer protrusion.

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

  First, FIG. 1 shows an engine mount 10 for an automobile as an embodiment of a fluid filled type vibration damping device according to the present invention. The engine mount 10 includes a mount main body 12, and the mount main body 12 includes a first attachment member 14 and a second attachment member 16 that are elastically connected to each other by a main rubber elastic body 18. It is structured. The first mounting member 14 is bolted to the power unit and attached, while the second mounting member 16 is attached to the vehicle body via the bracket 20, whereby the power unit is mounted by the engine mount 10. It is supported by being vibration-proof connected to the vehicle body. In the following description, the axial direction refers to the vertical direction in FIG. 1 that is generally the main vibration input direction in the central axis direction of the mount body 12, and the upper direction refers to the upper and lower directions in FIG. Means the lower part in FIG.

  More specifically, the first mounting member 14 has a substantially cylindrical shape extending in the axial direction as a whole, and is formed of a metal such as iron or an aluminum alloy or a hard synthetic resin. An annular plate-shaped flange portion 22 extending to the outer peripheral side is integrally formed at the axially intermediate portion of the first mounting member 14. Further, a bolt hole 24 that extends in the axial direction and opens upward is formed in the upper end surface of the first mounting member 14.

  Furthermore, the second mounting member 16 has a substantially cylindrical shape extending in the axial direction as a whole, and is formed of the same material as that of the first mounting member 14. An intermediate portion in the axial direction of the second mounting member 16 is a straight portion 26 that extends straight in the axial direction, and a taper portion that is gradually expanded toward the upper end at the upper end of the straight portion 26. 28 is integrally formed. Further, an annular plate-shaped flange portion 30 that extends to the outer peripheral side is provided at the upper end of the tapered portion 28. On the other hand, an annular stepped portion 32 is provided at the lower end of the straight portion 26, and a large-diameter portion 34 having a larger diameter than the straight portion 26 is provided below the stepped portion 32. Further, a caulking piece 36 extends from the lower end of the large diameter portion 34 toward the inner peripheral side.

  In a state where the first mounting member 14 and the second mounting member 16 are concentric and the first mounting member 14 is spaced apart upward from the second mounting member 16, both the mounting members 14. 16 are elastically connected to each other by a main rubber elastic body 18. The main rubber elastic body 18 has a generally thick, large-diameter truncated cone shape as a whole, and the small-diameter side end of the main rubber elastic body 18 is vulcanized and bonded to the first mounting member 14. The large diameter side end is vulcanized and bonded to the second mounting member 16. In the present embodiment, the main rubber elastic body 18 is formed as an integrally vulcanized molded product including the first mounting member 14 and the second mounting member 16.

  Further, a large-diameter recess 38 having a substantially mortar shape in the opposite direction is formed in the central portion of the large-diameter side end face of the main rubber elastic body 18. Further, a seal rubber layer 40 extending downward from the outer peripheral edge of the lower end of the main rubber elastic body 18 is integrally formed, and this seal rubber layer 40 is substantially the inner peripheral surface of the straight portion 26 of the second mounting member 16. It is fixed so as to cover the whole. An annular step surface 42 is formed at the boundary between the main rubber elastic body 18 and the seal rubber layer 40, and the step surface 42 has an inner diameter dimension of the large-diameter recess 38 above the step surface 42. The inner diameter of the lower seal rubber layer 40 is a large diameter.

  Furthermore, a stopper rubber 44 integrally formed with the main rubber elastic body 18 is vulcanized and bonded to the outer peripheral surface and the upper surface of the flange portion 22 of the first mounting member 14.

  A flexible film 46 is attached to the lower opening of the second attachment member 16, and the lower opening of the second attachment member 16 is covered with the flexible film 46. The flexible film 46 of this embodiment is a thin circular rubber film as a whole, and has a slack so that elastic deformation is easily allowed.

  Further, a fixing member 48 is vulcanized and bonded to the outer peripheral end of the flexible film 46. The fixing member 48 is integrally provided with a substantially annular plate-shaped fixing portion 50 and a connecting portion 52 that protrudes upward from the outer peripheral end portion of the fixing portion 50. The outer peripheral end portion of the flexible film 46 is vulcanized and bonded to the inner peripheral end portion of the fixing portion 50, and the outer peripheral portion of the fixing portion 50 and the inner peripheral side of the connecting portion 52 are flexible. A seal rubber 54 integrally formed with the film 46 is vulcanized and bonded.

  The flexible membrane 46 having such a structure is formed by the caulking and fixing of the connecting portion 52 of the fixing member 48 together with the bracket 20 by the caulking piece 36 of the second mounting member 16 as will be described later. The second attachment member 16 is attached to the lower opening. Accordingly, the upper opening of the second mounting member 16 is closed by the main rubber elastic body 18, and the lower opening of the second mounting member 16 is closed by the flexible film 46. A fluid chamber 56 is formed between the opposing surfaces of the main rubber elastic body 18 and the flexible film 46 in a fluid-tight manner from the outside. The sealing rubber 54 is clamped between the opposing surfaces of the step portion 32 of the second mounting member 16 and the fixing portion 50 of the fixing member 48, so that the fixing member 48 is against the second mounting member 16. The fluid chamber 56 is assembled in a fluid tight manner, and the fluid tightness of the fluid chamber 56 is ensured.

  The fluid chamber 56 is filled with an incompressible fluid. The incompressible fluid to be encapsulated is not limited at all, but any of water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof can be suitably used. In order to effectively obtain a vibration isolation effect based on the fluid flow action described later, the incompressible fluid is desirably a low viscosity fluid of 0.1 Pa · s or less.

  In addition, a partition wall 58 is supported and accommodated in the fluid chamber 56 by the second mounting member 16. The partition wall 58 is generally thick and has a substantially disk shape, and includes a partition wall body 64 and a bottom plate member 66. The partition main body 64 and the bottom plate member 66 can be suitably formed of a metal such as iron or aluminum alloy, a hard synthetic resin, or the like.

  The partition wall body 64 is generally thick and substantially disk-shaped, and the partition wall body 64 is formed with a circumferential groove 68 extending on the outer circumferential surface over a length of approximately one circumference in the circumferential direction. Yes. One end of the circumferential groove 68 opens to the upper surface of the partition body 64 through an upper communication hole (not shown), and the other end of the circumferential groove 68 passes through a lower communication hole (not shown). Open on the lower surface of the.

  Further, on the upper surface of the partition wall main body 64, a substantially circular central recess 70 opening upward is formed in a central portion where the outer peripheral circumferential groove 68 is disengaged to the inner peripheral side. On the other hand, a substantially circular fitting recess 72 that opens downward is formed on the lower surface of the partition wall main body 64, and an outer peripheral circumferential groove 68 is formed on the inner peripheral side on the upper bottom surface of the fitting recess 72. A substantially circular receiving recess 74 that opens downward is formed in the detached portion.

  Further, an upper through window 76 is provided so as to penetrate between the bottom surface of the central recess 72 and the upper bottom surface of the housing recess 74. In the present embodiment, a pair of upper through windows 76 and 76 are provided, each of which has a substantially rectangular shape, and corresponds to communication paths 96 and 96 of a rubber elastic plate 94 to be described later. Extends toward you.

  On the other hand, the bottom plate member 66 has a thin and substantially disk shape as a whole, and a through hole (not shown) that penetrates in the plate thickness direction is provided at a position corresponding to the lower communication hole of the partition wall body 64. When the bottom plate member 66 is assembled to the partition body 64, the other end of the circumferential groove 68 opens to the lower surface of the partition wall 58 through the lower communication hole of the partition body 64 and the through hole of the bottom plate member 66. ing. In addition, the bottom plate member 66 is formed with a pair of lower through windows 78 and 78 having a substantially rectangular shape at positions and sizes substantially corresponding to the upper through windows 76 and 76 of the partition wall body 64.

  The bottom plate member 66 is fitted into the fitting recess 72 of the partition main body 64 and is fixed by press-fitting or the like, so that the partition 58 is configured. The lower opening of the housing recess 74 is covered with the bottom plate member 66, so that a housing space 79 is formed inside the partition wall 58.

  The partition wall 58 is inserted from the lower opening of the second mounting member 16 and the straight portion 26 of the second mounting member 14 is subjected to diameter reduction processing or the like, so that the partition wall 58 becomes the second mounting member. 16 is supported and assembled. The partition wall 58 extends in a direction perpendicular to the axis, and the fluid chamber 56 is vertically divided into two by the partition wall 58. That is, on the upper side across the partition wall 58, a part of the wall portion is constituted by the main rubber elastic body 18, and a pressure receiving chamber 80 is formed as a first fluid chamber in which an internal pressure fluctuation is caused when vibration is input. Yes. On the other hand, on the lower side across the partition wall 58, a part of the wall portion is constituted by the flexible film 46, and a second fluid chamber in which volume change is easily allowed by deformation of the flexible film 46. The equilibrium chamber 81 is formed. As a result, a relative pressure change is generated between the pressure receiving chamber 80 and the equilibrium chamber 81 during vibration input.

  The incompressible fluid is filled into the chambers 80 and 81 by, for example, the partition wall 58, the flexible membrane 46, and the fixing member 48 from the lower opening of the second mounting member 16 in the incompressible fluid. Can be performed simultaneously with the formation of the pressure receiving chamber 80 and the equilibrium chamber 81. Note that the axial position of the partition wall 58 is such that the outer peripheral edge portion of the upper end surface of the partition wall 58, the large-diameter side end portion of the main rubber elastic body 18, and the stepped surface 42 provided at the boundary of the seal rubber layer 40 are in contact with each other. It is defined by touching.

  Then, the partition wall 58 is assembled to the second mounting member 16, so that the circumferential groove 68 opened on the outer peripheral surface of the partition wall 58 is covered with the seal rubber layer 40, whereby the pressure receiving chamber 80 and the equilibrium chamber 81 are mutually connected. An orifice passage 82 is formed by extending the outer peripheral portion of the partition wall 58 in the circumferential direction. In the present embodiment, the vibration target vibration frequency of the orifice passage 82 is adjusted by adjusting the ratio (A / L) between the passage cross-sectional area (A) and the passage length (L), thereby shaking vibration of the automobile. It is tuned to about 10 to 15 Hz corresponding to low frequency large amplitude vibrations.

  A bracket 20 in which mounting bolts 84 are implanted is attached to the second mounting member 16 of the mount body 12 having the above-described structure. That is, after the partition wall 58, the flexible membrane 46, and the fixing member 48 are inserted from the lower opening of the second mounting member 16 in the incompressible fluid, the second mounting member 16 is opened in the air. By inserting the bracket 20 from the side opening and caulking the lower end of the second mounting member 16, the connecting portion 52 of the fixing member 48 and the bracket 20 are connected by the caulking piece 36 of the second mounting member 16. The bracket 20 is attached to the lower opening of the second attachment member 16 by caulking and fixing.

  The upper portion of the main rubber elastic body 18 is covered with a stopper cylinder member 86. The stopper cylinder member 86 has a substantially cylindrical shape as a whole. The stopper cylinder member 86 is caulked to the lower end of the stopper cylinder member 86 so that the caulking portion 88 at the lower end of the stopper cylinder member 86 is a flange of the second mounting member 16. The stopper cylinder member 86 is attached to the mount body 12 by being fixed to the portion 30. The upper end portion of the stopper cylinder member 86 is bent toward the inner peripheral side to form a stopper abutting portion 90, and the stopper abutting portion 90 and the flange portion 22 of the first mounting member 14 support the stopper rubber 44. Are opposed in the axial direction. When a load in the rebound direction, which is a direction in which the first mounting member 14 and the second mounting member 16 are separated from each other, is input to the engine mount 10, the stopper contact portion 90 and the flange portion 22. And the stopper abutting portion 90 and the flange portion 22 constitute a rebound stopper.

  Further, a substantially reverse bottomed cylindrical heat seal rubber 92 is fixed to the first mounting member 14 above the stopper cylinder member 86 so that the heat seal rubber 92 covers the stopper cylinder member 86 from above. Is provided.

  Here, a rubber elastic plate 94 is accommodated in the accommodating space 79 of the partition wall 58. As shown in FIGS. 2 to 8, the rubber elastic plate 94 has a substantially disk shape as a whole, and extends substantially parallel to one radial direction (vertical direction in FIG. 5) at a substantially central portion. A pair of communication passages 96, 96 are formed. These communication passages 96, 96 are each formed with a slit-like opening extending substantially linearly with a predetermined width, and are formed so as to penetrate in the thickness direction of the rubber elastic plate 94.

  In addition, at the opening edge of each communication passage 96, 96, one side in the width direction of the communication passages 96, 96 (right side in FIG. 5 or left side in FIG. 6) is on both sides in the opening direction (vertical direction). Projecting valve-like rubber protrusions 98, 98, 98, 98 are integrally formed with the rubber elastic plate 94. That is, in FIG. 5, valve-like rubber projections 98, 98 projecting upward from the right opening edge of the communication passages 96, 96 are formed on the upper surface of the rubber elastic plate 94. Are formed on the lower surface of the rubber elastic plate 94 with valve-like rubber protrusions 98, 98 projecting downward from the left opening edge of the communication passages 96, 96. In each of the valve-like rubber protrusions 98, both end portions in the length direction (vertical direction in FIG. 5) of the communication passages 96 and 96 (slits) are fixed to the rubber elastic plate 94.

  Further, at the base end portion of each valve-like rubber protrusion 98, each valve-like shape extends on the side opposite to the communication path 96 over substantially the entire length in the width direction (vertical direction in FIG. 5) of each valve-like rubber protrusion 98. A lightening groove 100, 100, 100, 100 extending along the rubber protrusion 98 is formed. The height dimensions of the respective valve-like rubber protrusions 98 other than both end portions in the width direction are substantially increased by the cutout grooves 100, so that the degree of freedom of deformation of the central portion in the width direction of each valve-like rubber protrusion 98 is increased. Is increased, and the elastic characteristics of each valve-like rubber protrusion 98 are also adjusted.

  Furthermore, the buffer protrusions 102, 102, 102, 102 that extend over substantially the entire length in the depth direction of the fillet groove 100 are respectively formed in the center part in the width direction of the inner surface of each fillet groove 100 facing the valve-like rubber protrusion 98. Are integrally formed.

  On the other hand, at the opening edge of each communication passage 96, on the opposite shore side of the valve-like rubber projection 98 across the communication passage 96, buffer protrusions 104, 104 projecting in the same direction on the same surface as the valve-like rubber projection 98. , 104, 104 are integrally formed. These buffer protrusions 104 have substantially the same width dimensions as the respective valve-like rubber protrusions 98, and the height dimensions are different in the width direction (the slit direction of each communication passage 96). That is, in each buffer ridge 104, the height dimension of the width direction center part 106 is made larger than the height dimension of the width direction both end parts 108 and 108, and in this embodiment, each buffer ridge 104 is As a whole, the corrugated shape has different heights that are continuously different in the width direction. In particular, in the present embodiment, the buffer portion 110a is provided in the central portion 106, and the buffer portions 110b and the trough portions 112 are provided in both end portions 108 and 108, respectively, and five buffer protrusions 110a and 110b are provided. The six trough portions 112 form a wave-shaped buffering protrusion 104 as a whole. The height dimension of the buffer protrusion 110a provided in the central portion 106 is made larger than the height dimension of the buffer protrusion 110b provided in the both end portions 108 and 108. The maximum height dimension of each buffer protrusion 104 (the height dimension of the buffer protrusion 110a provided on the central portion 106) is smaller than the height dimension of each valve-like rubber protrusion 98.

  In this embodiment, the valve-like rubber protrusions 98 and 98 formed on the upper and lower surfaces of the rubber elastic plate 94 and the buffer protrusions 110a and 110b constituting the buffer protrusions 104 and 104 are directed in the same direction. It extends substantially in parallel. In particular, in this embodiment, the valve-like rubber protrusion 98 and the buffer protrusions 104 and 104 extend in a direction slightly inclined with respect to the axial direction, and the valve-like rubber protrusion 98 protruding upward or downward respectively With respect to the axial direction, it extends slightly incline toward the opposing buffer ridges 104, 104.

  Further, seal lips 114 and 114 are provided on the outer peripheral edges of the upper and lower surfaces of the rubber elastic plate 94, respectively, and the seal lips 116 are also provided around the communication paths 96 and 96 on the upper and lower surfaces of the rubber elastic plate 94. , 116, 116, 116 are provided. Further, a plurality of elastic protrusions 118 are provided on the upper and lower surfaces of the rubber elastic plate 94 on the inner side of the seal lip 114 and on the outer side of the seal lip 116. 2-4, illustration of the elastic protrusion 118 is abbreviate | omitted. Each of the seal lips 114 and 116 and the elastic protrusion 118 has a hemispherical cross-sectional shape. The thickness of the rubber elastic plate 94 including the seal lips 114, 116 and the elastic protrusion 118 is slightly larger than the depth of the accommodation space 79, and the rubber elastic plate 94 is assembled to the partition wall 58. Liquid tightness is ensured.

  The rubber elastic plate 94 having such a structure is assembled in the accommodation space 79 in a state where the communication passages 96, 96, the upper through windows 76, 76, and the lower through windows 78, 78 are aligned with each other. It has been. That is, in the present embodiment, the valve-like rubber protrusions 98 and 98 protruding upward from the rubber elastic plate 94 are inserted into the upper through windows 76 and 76 and slightly protrude into the pressure receiving chamber 80, and the rubber elastic plate Valve-like rubber protrusions 98, 98 protruding downward from 94 are inserted into the lower through windows 78, 78 and slightly protrude into the equilibrium chamber 81.

  In the rubber elastic plate 94, the periphery of the portion where the communication passages 96, 96 are formed is sandwiched from above and below between the upper bottom wall of the housing recess 74 and the bottom plate member 66, thereby the rubber elastic plate 94. Is supported in the accommodation space 79. That is, in the present embodiment, the hard partition member that supports the rubber elastic plate 94 with the rubber elastic plate 94 interposed therebetween is constituted by the partition body 64 and the bottom plate member 66, in other words, the partition wall 58.

  Further, the pressure receiving chamber 80 and the equilibrium chamber 81 are communicated with each other through the upper through windows 76 and 76, the communication passages 96 and 96, and the lower through windows 78 and 78. That is, the fluid passage 120 is constituted by the upper through window 76, the communication passage 96, and the lower through window 78, and the fluid flow between the pressure receiving chamber 80 and the equilibrium chamber 81 is the fluid passages 120, 120. To be allowed through.

  In the present embodiment, the frequency to be subjected to vibration isolation of the fluid flow paths 120 and 120 is adjusted by adjusting the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L). It is tuned to a higher frequency side than the frequency to be vibration-proofed in the passage 82, for example, about 20 to 50 Hz or about 100 Hz corresponding to medium to high frequency low amplitude vibration such as idling vibration of a car and traveling boom vibration.

  In the engine mount 10 having the above-described structure, when the incompressible fluid flows through the fluid flow paths 120 and 120 in response to the input of vibration, the valve-like rubber protrusion 98 is generated by the fluid pressure of the fluid flow. , 98 are elastically deformed to constitute amplitude-dependent valve means for closing the fluid flow paths 120, 120.

  That is, the fluid pressure difference caused by the relative pressure fluctuation between the pressure receiving chamber 80 and the equilibrium chamber 81 generated when a large amplitude vibration is input acts to balance the valve-like rubber protrusions 98 and 98 protruding toward the pressure receiving chamber 80. The valve-like rubber protrusions 98 and 98 protruding toward the chamber 81 are repeatedly elastically deformed so as to fall alternately toward the communication passages 96 and 96 in response to pressure fluctuations. Then, as shown in FIG. 9A, the buffer protrusions 104, 104 in which the tips of the elastically deformed valve-shaped rubber protrusions 98, 98 are located at the edge of the communication passages 96, 96 on the opposite bank side. , The openings of the communication passages 96, 96 are covered, and a closed state in which fluid flow through the fluid flow paths 120, 120 is substantially prevented is achieved. As a result, when large amplitude vibrations are input, pressure fluctuations induced in the pressure receiving chamber 80 are prevented from escaping to the equilibrium chamber 81 through the fluid flow paths 120 and 120, and the amount of fluid flow through the orifice passage 82 is efficiently secured. As a result, the intended anti-vibration effect such as the vibration damping effect based on the resonance action of the fluid flowing through the orifice passage 82 is effectively exhibited.

  Here, the valve-like rubber protrusions 98 and 98 that are elastically deformed toward the communication passages 96 and 96 are buffer protrusions 104 and 104 that protrude on the surface of the rubber elastic plate 94 on the opposite bank side of the slit-like communication passages 96 and 96. On the other hand, the front end portion comes into contact first. Further, the heights of the buffer protrusions 104, 104 are different in the width direction, and the central portions 106, 106 are the highest, so that the tip portions of the valve-like rubber elastic bodies 98, 98 and the buffer protrusions. The central portions 106 and 106 of the strips 104 and 104 come into contact with each other first.

  Even after abutting against the buffer protrusions 104, 104, the valve-like rubber protrusions 98, 98 are connected to the communication passages 96, 96 at the base end side portion with respect to the abutting portions to the buffer protrusions 104, 104. Elastic deformation toward the opening is allowed. Therefore, even when the rubber-like rubber protrusions 98 and 98 are elastically deformed, the buffering action at the time of contact with the buffer protrusions 104 and 104 is exhibited. Further, as shown in FIG. 9B, the valve-like rubber protrusions 98, 98 are the opening portions of the communication passages 96, 96 on the base end side with respect to the abutting portions to the buffer protrusions 104, 104. By being elastically deformed so as to enter, the buffer protrusions 104, 104 facing the valve-like rubber protrusions 98, 98 located on the opposite bank side of the communication passages 96, 96 and the inner surfaces of the communication passages 96, 96 are overlapped. As described above, the tip portions of the valve-like rubber protrusions 98 and 98 are pressed.

  Thus, even when the protrusion height of each buffer protrusion constituting the buffer protrusion is different in the slit length direction, or a plurality of buffer protrusions are substantially divided in the slit length direction, The valve-like rubber protrusions 98, 98 are further elastically deformed after coming into contact with the buffer protrusions 110a, 110a provided on the central portions 106, 106, so that the communication passages 96, covered with the valve-like rubber protrusions 98, 98, The gaps in the 96 openings can be made sufficiently small so that the fluid flow paths 120, 120 are substantially closed.

  On the other hand, the elastic deformation of the valve-like rubber elastic bodies 98, 98 does not occur during the input of medium to high frequency low amplitude vibration, and the fluid flow paths 120, 120 are maintained in communication. At the same time, the orifice passage 82 is substantially closed by the antiresonant action of the fluid, so that the amount of fluid flow through the fluid flow paths 120 and 120 is efficiently ensured. Therefore, the intended vibration-proofing effect such as the vibration damping effect based on the resonance action of the fluid flowing through the fluid flow paths 120 and 120 is effectively exhibited.

  In the engine mount 10 having the above-described structure, the buffer protrusions 104 and 104 including the plurality of buffer protrusions 110a and 110b are formed at the portions where the valve-like rubber protrusions 98 and 98 are brought into contact with each other. Further, the hitting sound and impact associated with the contact of the valve-like rubber protrusions 98 and 98 can be reduced. In particular, in the initial stage, only the tips of the valve-like rubber protrusions 98, 98 and the central portions 106, 106 of the buffer protrusions 104, 104 are in contact with each other. When the accompanying pressure is applied, elastic deformation also occurs at the base end portions of the valve-like rubber protrusions 98 and 98, and the whole of the valve-like rubber protrusions 98 and 98 is deformed to the buffer protrusions 104 and 104. The fluid flow paths 120 and 120 are closed so as to come into contact with the side surfaces. Thus, since the valve-like rubber protrusions 98 and 98 and the buffer protrusions 104 and 104 are in contact with each other so that the contact area gradually increases, an excellent buffering action can be exhibited.

  In particular, since both end portions in the width direction of the valve-like rubber protrusions 98 and 98 are fixed to the rubber elastic plate 94, elastic deformation at both end portions in the width direction of the valve-like rubber protrusions 98 and 98 is hardly caused in the initial stage. Therefore, the central portions in the width direction of the valve-like rubber protrusions 98, 98 are effectively deformed and come into contact with the buffer protrusions 110a, 110a of the center portions 106, 106 which are the tips of the buffer protrusions 104, 104. . Thereafter, both end portions in the width direction of the valve-like rubber protrusions 98, 98 are also deformed and abut against the respective buffer protrusions 110b of the both end portions 108, 108 of the buffer protrusions 104, 104, so that the contact area is stably increased. Thus, the buffering action can be more effectively exhibited.

  Such a buffering action does not change the characteristics of the valve-like rubber protrusion, for example, by softly forming the valve-like rubber protrusion, and is exhibited by the shape of each buffer protrusion, etc. The buffering action is exhibited without any loss of the vibration isolation characteristics, so that both the effect of preventing the generation of abnormal noise and impact and the vibration isolation effect can be achieved more reliably.

  Further, since the buffer protrusions 110a, 110b constituting the buffer protrusions 104, 104 are different in height in the width direction smoothly and continuously as a whole, the valve-like rubber protrusions 98, 98 are different. At the time of contact, the contact area gradually increases. As a result, the buffering action associated with the valve-like rubber protrusions 98, 98 striking against the buffer protrusions 104, 104 can be more effectively exhibited.

  Further, in the present embodiment, the buffer protrusions 102 are provided on the inner surfaces of the fillet grooves 100, 100 facing the valve-like rubber protrusions 98, 98. Thereby, when the valve-like rubber protrusions 98 and 98 are elastically deformed to the opposite side of the communication passages 96 and 96 based on the relative pressure difference between the pressure receiving chamber 80 and the equilibrium chamber 81, the valve-like rubber protrusions 98 and 98. And the buffering protrusions 102 and 102 come into contact with each other, and the buffering action is exhibited. Therefore, it is possible to prevent the generation of noise and impact caused by the contact between the valve-like rubber protrusions 98 and 98 and the opening edge portions of the lightening grooves 100 and 100 facing the valve-shaped rubber protrusions 98 and 98.

  Furthermore, in the present embodiment, the valve-like rubber protrusions 98, 98 and the buffer protrusions 110a, 110b constituting the buffer protrusions 104, 104 extend substantially in parallel. The possibility that the fluid flow through the fluid flow paths 120 and 120 may be stably exhibited by reducing the possibility that the channels 120 and 120) are locally narrowed and the stable fluid flow is hindered. .

  In the present embodiment, since the periphery of the formation portion of the communication passages 96, 96 in the rubber elastic plate 94 is supported by being sandwiched by a hard partition member (partition wall 58), the communication of the rubber elastic plate 94 is performed. It can be effectively avoided that the periphery of the portion where the passages 96 and 96 are formed is deformed or displaced to affect the vibration isolation characteristics.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.

  For example, in the above-described embodiment, the highest buffer protrusion 110a is provided at the central portion 106 in the slit length direction, and two lower buffer protrusions 110b are provided at both end portions 108 and 108, and these adjacent buffer protrusions 110b are provided. Although the trough 112 is provided between the protrusions 110a and 110b, the plurality of buffer protrusions are formed as the buffer protrusions 104 integrally connected as a whole. However, the present invention is not limited to such a mode.

  That is, it is not necessary for the plurality of buffer protrusions to change the height dimension smoothly and continuously over substantially the entire length in the width direction (slit length direction). For example, a portion where the height dimension changes linearly, a portion where the height dimension does not change, a portion that rises substantially vertically, and the like may be provided. Furthermore, the aspect etc. with which the several buffer protrusion was provided independently in the state divided | segmented by the slit length direction may be sufficient. In addition, the plurality of buffer protrusions only need to have the largest height of the buffer protrusion provided in the central portion, for example, the protrusion height is larger than the buffer protrusions provided at both end portions in the slit length direction. An aspect in which a plurality of buffer protrusions are provided in the central portion may be used.

  Furthermore, in the above-described embodiment, one buffer protrusion 102 is provided in the center on the inner surface facing the valve-like rubber protrusion 98 in the lightening groove 100. However, the number and position of the buffer protrusions, the protrusion height The sheath length is not limited in any way. However, such a buffer protrusion is not essential in the present invention.

  In the embodiment, the partition wall 58 that partitions the fluid chamber 56 into the pressure receiving chamber 80 and the equilibrium chamber 81 is provided, and the partition member that supports the rubber elastic plate 94 by the partition 58 is configured. The outer peripheral edge portion of the elastic plate 94 is fixedly and fluid-tightly supported by the second mounting member, so that the partition wall can be formed of a rubber elastic plate.

  Further, the number, size, shape, etc. of the communication passages formed in the rubber elastic plate are not limited at all. In the above-described embodiment, the two communication passages 96 and 96 that open in a rectangular slit shape are formed. However, for example, one or three or more communication passages may be formed, or a circular hole or the like may be used. . In this way, by changing the number, size, shape, and the like of the communication path, it is possible to easily tune the frequency that is the object of vibration isolation.

  The fluid-filled vibration isolator according to the present invention includes not only the engine mount exemplified in the above embodiment, but also a fluid-filled vibration isolator for automobiles such as a body mount, a differential mount, and a subframe mount. The present invention can also be applied to a fluid-filled vibration isolator other than the above.

10: engine mount (fluid-sealed vibration isolator), 58: partition wall (partition member), 80: pressure receiving chamber (first fluid chamber), 81: equilibrium chamber (second fluid chamber), 82: orifice passage, 94: rubber elastic plate, 96: communication path, 98: valve-like rubber protrusion, 100: cutout groove, 102: buffer protrusion, 106: center portion, 108: end portion, 110a, 110b: buffer protrusion

Claims (6)

There are provided a first fluid chamber and a second fluid chamber in which a relative pressure change is caused by vibration input, and the first fluid chamber and the second fluid chamber are connected by an orifice passage. In addition, a slit-like communication passage having a predetermined width is provided in a rubber elastic plate disposed in a partition wall that partitions the first fluid chamber and the second fluid chamber, and is tuned to a higher frequency side than the orifice passage. On the other hand, valve-like rubber protrusions projecting on opposite surfaces of the rubber elastic plate are integrally formed at both side openings of the communication passage, and each valve-like rubber protrusion of the rubber elastic plate The base end side is formed with a hollow groove extending along the valve-like rubber protrusion on the side opposite to the communication path, and the valve-like rubber protrusion is formed on the opening side of the communication path by fluid pressure due to vibration input. Amplitude-dependent valve means for elastically deforming and closing the communication path is configured. In the fluid filled type vibration damping device,
The opening edge located on the opposite shore side of the communication path with respect to the valve-like rubber protrusion protrudes on the same surface of the rubber elastic plate as the valve-like rubber protrusion and at a height smaller than the valve-like rubber protrusion. A plurality of buffer protrusions are integrally formed, and the protrusion height of the buffer protrusions is different in the slit direction of the communication path, and the protrusion height is higher than both end portions in the central portion of the communication path in the slit direction. A fluid-filled vibration isolator having a large buffer protrusion.   The fluid filled type vibration damping device according to claim 1, wherein the plurality of buffer protrusions have a wave shape with continuously different heights in a slit direction of the communication path.   The fluid-filled vibration isolator according to claim 1 or 2, wherein the rubber elastic plate is integrally formed with a shock-absorbing protrusion extending in a depth direction on an inner surface facing the valve-shaped rubber protrusion in the cutout groove. .   The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the valve-like rubber protrusion and the buffer protrusion protrude in parallel in the same direction.   The fluid according to any one of claims 1 to 4, wherein the rubber elastic plate is supported by being sandwiched on both sides by a hard partition member around a portion where the communication path is formed. Enclosed vibration isolator.   The rubber elastic plate is formed with a plurality of communication passages in which the valve-like rubber protrusion and the buffer protrusion protrude from the opening portions on both sides of the rubber elastic plate, and the rubber elastic plate The fluid-filled type vibration-proofing according to any one of claims 1 to 5, wherein the partition is configured by being supported by sandwiching both surfaces thereof by a hard partition member around each communication passage forming portion. apparatus.