JP5108659B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to a fluid filled type vibration damping device that utilizes a vibration damping effect based on the flow action of an incompressible fluid sealed inside.

  Conventionally, as a type of a vibration isolator such as a vibration isolator coupling body and a vibration isolator support member interposed between members constituting a vibration transmission system, the first mounting member and the second mounting member are formed as a main rubber elastic body. The anti-vibration device connected in the above is known, and a fluid-filled anti-vibration device is known as an advanced type of the anti-vibration device. This fluid filled type vibration damping device forms a pressure receiving chamber in which a part of the wall is made of a main rubber elastic body and an equilibrium chamber in which a part of the wall is made of a flexible film. An incompressible fluid is enclosed, and the two chambers communicate with each other through an orifice passage. According to such a structure, vibration is input to the pressure receiving chamber, and a vibration isolation effect can be exerted by a fluid action such as a resonance action of a fluid flowing through the orifice passage due to a relative pressure variation between the pressure receiving chamber and the equilibrium chamber. . Such a fluid-filled vibration isolator has been studied for application to, for example, an automobile engine mount, body mount, differential mount, suspension member mount, suspension bushing, and the like.

  By the way, in an engine mount for automobiles and the like, an anti-vibration effect is required for vibrations in a plurality of frequency ranges. Therefore, in general, the orifice passage is tuned to low-frequency large-amplitude vibrations such as engine shakes, and high-frequency small-amplitude vibrations such as running-up noise are supported by providing a movable membrane that absorbs pressure fluctuations in the pressure receiving chamber is doing.

  In addition, in engine mounts for automobiles and the like, in recent years, generation of vibration and abnormal noise has been regarded as a problem when an excessive vibration load or impact load is input. This is considered to be mainly due to cavitation bubbles accompanying excessive negative pressure in the pressure receiving chamber. That is, when a vibration with a large amplitude is inputted and the pressure in the pressure receiving chamber is remarkably lowered, the air dissolved in the fluid in the pressure receiving chamber undergoes liquid phase separation to form cavitation bubbles. Then, the water hammer pressure accompanying the collapse of the bubbles propagates to the first mounting member and the second mounting member, and is transmitted to the members constituting the vibration transmission system such as the automobile body. Sound and vibration are thought to occur.

  In order to cope with such a problem, the present applicant previously described in Patent Document 1 (Japanese Patent Application No. 2007-311749) provided a communication path that connects both chambers to a partition member that divides the pressure receiving chamber and the equilibrium chamber. A novel structure has been proposed in which a closing rubber elastic plate that closes the communication path by overlapping the passage from the pressure-receiving chamber side is provided to configure communication path blocking / blocking control means. When a sudden pressure drop occurs in the pressure receiving chamber when an excessive vibration load or impact load is input, the closed rubber elastic plate elastically deforms and separates from the partition member, so that the communication path is in communication, and the pressure receiving chamber and the equilibrium chamber By short-circuiting, cavitation can be avoided. Further, the closed rubber elastic plate can also exhibit an anti-vibration effect against high-frequency small-amplitude vibrations by exhibiting a function of absorbing pressure fluctuations in the pressure receiving chamber by elastic deformation under the condition that the communication path is blocked.

  Here, the present inventor has made further studies on the fluid-filled vibration isolator described in Patent Document 1, and has conceived that there is still room for improvement. That is, in the communication / blocking control means described in Patent Document 1, when a vibration such as an engine shake is input, the closing rubber elastic plate covering the communication path is elastically deformed based on the pressure difference exerted on both the front and back surfaces. The pressure in the pressure receiving chamber is absorbed along with the elastic deformation. For this reason, the amount of fluid flow through the orifice passage is reduced, and there is a possibility that the anti-vibration effect against the low-frequency large-amplitude vibration by the orifice passage is not sufficiently exhibited.

  In order to cope with this, it is conceivable to increase the deformation rigidity of the closed rubber elastic plate, but this makes it difficult to reduce the pressure fluctuation in the pressure receiving chamber when inputting high-frequency small-amplitude vibrations such as traveling noise. The problem that the anti-vibration performance against high-frequency small-amplitude vibration is reduced, or when an excessive or shocking vibration load is input, it is difficult to secure a sufficient amount of separation deformation from the partition member of the closing rubber elastic plate. This causes a problem that a short circuit between the pressure receiving chamber and the equilibrium chamber cannot be realized quickly.

  In short, in the fluid-filled vibration isolator disclosed in Patent Document 1, (i) the anti-vibration effect against low-frequency large-amplitude vibration caused by the orifice passage, and (ii) high-frequency small-amplitude vibration caused by elastic deformation of the closed rubber elastic plate. While satisfying both the vibration isolation effect and (iii) suppressing the generation of shocks and abnormal noise caused by pressure fluctuations in the pressure receiving chamber due to excessive vibration input, the requirements are still not fully satisfied. There was a case.

Japanese Patent Application No. 2007-311749

  Here, the present invention has been made in the background as described above, and the problem to be solved is (i) a sufficient anti-vibration effect against low-frequency large-amplitude vibration caused by the orifice passage. On the other hand, from the prior application (Patent Document 1), (ii) an anti-vibration effect against high-frequency small-amplitude vibration and (iii) an effect of suppressing an impact or abnormal noise when an excessive vibration is input can be more effectively exhibited. It is another object of the present invention to provide a fluid-filled vibration isolator having a further improved 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 and technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an inventive concept that can be grasped by those skilled in the art from those descriptions. It should be understood that this is recognized on the basis of

  That is, a feature of the present invention is that the first mounting member and the second mounting member are connected by the main rubber elastic body, and a pressure receiving chamber in which a part of the wall portion is configured by the main rubber elastic body, An orifice that forms an equilibrium chamber in which a part of the wall is made of a flexible membrane, encloses the incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and communicates the pressure receiving chamber and the equilibrium chamber with each other In the fluid-filled vibration isolator provided with a passage, the partition member that partitions the pressure receiving chamber and the equilibrium chamber forms a communication port that communicates the pressure receiving chamber and the equilibrium chamber, and the pressure receiving pressure with respect to the communication port A closing rubber elastic plate that is overlapped from the chamber side and closes the communication port is disposed so that the pressure of the pressure receiving chamber is exerted on one surface of the closing rubber elastic plate and the equilibrium is applied to the other surface through the communication port. The closure rubber elastic plate while allowing the chamber pressure to be exerted A contact holding portion that is held in an overlapping state with respect to the partition member at a central contact holding portion located at a central portion of the closing rubber elastic plate and radially from the center contact holding portion toward the outer peripheral side. A plurality of spoke-like contact holding portions extending, and a region between the circumferential directions of the spoke-like contact holding portions adjacent to each other in the circumferential direction in the closed rubber elastic plate is a pressure difference between the pressure receiving chamber and the equilibrium chamber. As the elastic deformation region that is elastically deformed based on the elastic deformation region, the communication port is brought into a communication state through the outer peripheral edge of the elastic deformation region by elastic deformation of the elastic deformation region in a direction away from the partition member. None, and further, in the elastic deformation region, the amount of displacement in the direction away from the partition member is limited in the central portion separated from both the spoke-like contact holding portion and the outer peripheral edge portion on both sides in the circumferential direction. In fluid-filled vibration damping device having a sexual deformation limiting means.

  In such a fluid-filled vibration isolator having a structure according to the present invention, high-frequency small-amplitude vibration is input between the first mounting member and the second mounting member, and the both sides of the closing rubber elastic plate are Under the condition that the fluctuation of the applied pressure difference is small, the pressure in the pressure receiving chamber is absorbed by the minute deformation displacement in the elastic deformation region, and the vibration isolation effect against the high frequency small amplitude vibration can be exhibited. In some cases, the closing rubber elastic plate is separated from the partition member and the communication passage is opened, and the same effect can be exhibited based on the short-circuiting action between the pressure receiving chamber and the equilibrium chamber.

  On the other hand, when the input of low-frequency large-amplitude vibration in the tuning frequency range of the orifice passage has a large fluctuation in the pressure difference exerted on the front and back surfaces of the elastic rubber plate, the elastic deformation region is greatly deformed so as to contact the partition member. The pressure absorbing action of the pressure receiving chamber due to such deformation displacement is suppressed. If necessary, the amount of displacement in the direction away from the partition member in the elastic deformation region can be limited by the elastic deformation limiting means when inputting such a low frequency large amplitude vibration. It is possible to prevent pressure leakage through the communication port in the chamber. As a result, due to the difference in the target pressure fluctuation between the pressure receiving chamber and the equilibrium chamber, a sufficient amount of fluid flow in the orifice passage is ensured, and a vibration isolation effect based on the fluid action such as the resonance action of the fluid can be stably obtained. It is done.

  Further, when an excessive or shocking vibration load is input and the pressure in the pressure receiving chamber is remarkably reduced, a pressure sufficient to elastically deform the elastic deformation region of the closing rubber elastic plate in the direction away from the partition member is elastic. The deformation area is affected. Here, the deformation of the central portion of the elastic deformation region is limited by the elastic deformation limiting means. The central portion of the elastic deformation region is an inner peripheral edge located on the central abutment holding part side in the closing rubber elastic plate, a circumferential edge located on each spoke contact holding part side, an outer peripheral side of the closing rubber elastic board The part inside the edge part including the outer peripheral edge part etc. which are located in is said. Further, since the contact holding portions are provided on the inner circumferential side and both circumferential sides of the elastic deformation region, the spring characteristics on the inner circumferential side and both circumferential sides can be made harder than the spring characteristics on the outer circumferential side. . Therefore, strain (elastic deformation) in a direction away from the partition member in the elastic deformation region is concentrated on the outer peripheral side, and the outer peripheral edge portion of the elastic deformation region is largely and rapidly separated from the partition member. As a result, the generation of an excessive negative pressure in the pressure receiving chamber can be avoided or quickly eliminated, and the generation of abnormal noise and vibration that can be attributed to cavitation can be prevented.

  Therefore, in the fluid-filled vibration isolator having the structure according to the present invention, the above-mentioned (i) securing of the anti-vibration effect against the low-frequency large-amplitude vibration by the orifice passage and (ii) the anti-vibration effect against the high-frequency small-amplitude vibration And (iii) the effect of suppressing impact and abnormal noise at the time of excessive vibration input can be effectively achieved.

  Further, in the fluid filled type vibration damping device of the present invention, a pressure receiving chamber side cover member that covers the elastic deformation region of the closed rubber elastic plate separately from the pressure receiving chamber side is provided, and the elastic deformation region and The pressure receiving chamber side cover member has a contact surface provided with an abutting protrusion that protrudes from one side toward the other and has a tip that faces the other side at a predetermined distance. An aspect may be employed in which the elastic deformation limiting means is configured by elastically deforming and separating from the partition member so that the corresponding contact protrusion comes into contact with the other. According to such an aspect, desired deformation restriction of the elastic deformation region can be advantageously realized by setting the shape, size, structure, number, arrangement, and the like of the contact protrusion.

  Further, in the fluid filled type vibration damping device of the present invention, the communication port of the partition member is formed with the abutting protrusion on the opposing surface of the elastic deformation region of the closing rubber elastic plate and the pressure receiving chamber side cover member. A mode in which the opening is formed on the outer peripheral side with respect to the part may be employed. According to such an aspect, the pressure in the equilibrium chamber through the communication port is reduced on the outer peripheral side of the elastic deformation region in a state where deformation of the central portion of the elastic deformation region is limited by the contact protrusion and the pressure receiving chamber side cover member. Thus, the large separation displacement from the target partition member at the outer peripheral edge portion of the elastic deformation region is further accelerated.

  Further, in the fluid filled type vibration damping device of the present invention, a closed gap that extends between the overlapping surfaces of the partition member and the elastic deformation region of the closing rubber elastic plate is formed, and with respect to the closing gap An aspect may be adopted in which the communication port of the partition member is connected and the pressure of the equilibrium chamber exerted through the communication port is exerted on the elastic deformation region through the closed gap.

  According to such an embodiment, the pressure in the equilibrium chamber spreads through the communication port to the closed gap and is exerted on a wide area of the closed rubber elastic plate. A sufficient amount of displacement in the direction in which the deformation region is separated from the partition member can be secured. As a result, the central portion of the elastic deformation region is more reliably limited by the elastic deformation limiting means, and the amount of separation displacement from the partition member at the outer peripheral edge of the elastic deformation region, and thus the positive pressure release amount from the equilibrium chamber to the pressure receiving chamber. Can be further increased. In addition, when the high-frequency small-amplitude vibration is input and the elastic deformation region is slightly deformed, the contact with the partition member is positively avoided by the closed gap, so that the desired small amount of the closed rubber elastic plate can be obtained. The pressure absorption effect of the pressure receiving chamber based on the deformation action can be further improved.

  In the fluid filled type vibration damping device of the present invention, a reinforcing member integrally including the central abutting holding portion and the plurality of spoke-like abutting holding portions is adopted, and the closing rubber elasticity is provided by the reinforcing member. A mode in which the contact holding portion is configured by partially suppressing elastic deformation of the plate may be employed. Thereby, the durability of the contact holding portion can be improved while ensuring the soft spring characteristic of the elastic deformation region.

  In the fluid filled type vibration damping device of the present invention, the contact holding portion is configured by integrally forming the central contact holding portion and the plurality of spoke-like contact holding portions on the closing rubber elastic plate. The aspect currently performed may be employ | adopted. Thereby, the obstruction | occlusion rubber elastic board provided with the contact holding | maintenance part and the elastic deformation area | region can be implement | achieved by simple structure.

  In the fluid filled type vibration damping device of the present invention, a pressure receiving chamber side cover member that covers the closed rubber elastic plate separately from the pressure receiving chamber side is provided, and the pressure receiving chamber side cover member includes The communication hole that connects the inner region between the pressure receiving chamber side cover member and the closed rubber elastic plate to the pressure receiving chamber is located at a position away from the portion of the closed rubber elastic plate facing the outer peripheral edge of the elastic deformation region. The provided aspect may be adopted.

  According to such an aspect, when the communication port opens with deformation of the elastic deformation region in a state where the pressure receiving chamber is significantly reduced in pressure, when bubbles are generated near the opening, the bubbles are received from the inner region through the communication holes. To flow. At that time, the bubbles come into contact with the cover member, so that the growth of the bubbles can be suppressed or the bubbles can be subdivided. Therefore, abnormal noise and vibration due to the water hammer pressure accompanying the collapse of large bubbles can be suppressed.

  Further, in the fluid filled type vibration damping device of the present invention, the closing rubber elastic plate is disposed so as to overlap the central portion of the partition member, while the outer peripheral portion of the partition member extends in the circumferential direction. A mode in which the orifice passage is formed may be adopted. According to such an aspect, both the area of the closed rubber elastic plate and the passage length of the orifice passage are ensured to be large, and the intended vibration isolation performance and cavitation prevention effect can be obtained efficiently.

  In the fluid filled type vibration damping device of the present invention, an annular seal is provided on the outer peripheral portion of the closing rubber elastic plate so as to protrude on the surface facing the partition member and continuously extend over the entire circumference. A mode in which the ridge is integrally formed and the seal ridge is in contact with the partition member in a state where the blocking rubber elastic plate is superimposed on the partition member may be employed. Thereby, the fluid tightness of the pressure receiving chamber can be further improved in the closed state of the communication port by the overlapping of the closed rubber elastic plate on the partition member.

  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 automotive engine mount 10 as a first embodiment relating to a fluid filled type vibration damping device of the present invention. The automobile engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are connected to each other by a main rubber elastic body 16. Yes. The first mounting bracket 12 is attached to the power unit of the automobile, and the second mounting bracket 14 is attached to the vehicle body, so that the power unit is connected to the vehicle body in a vibration-proof manner.

  In FIG. 1, the state of the vehicle engine mount 10 alone before being mounted on the vehicle is shown, but in the mounted state on the vehicle, the shared support load of the power unit is in the mount axis direction (in FIG. 1), the first mounting bracket 12 and the second mounting bracket 14 are displaced toward each other in the mount axis direction, and the main rubber elastic body 16 is elastically deformed. Further, under such a mounted state, main vibrations to be vibration-proofed are input in the direction of the mount axis. In the following description, unless otherwise specified, the vertical direction refers to the vertical direction in FIG.

  More specifically, the first mounting bracket 12 has a substantially circular block shape, and mounting bolts 18 project upward. The first mounting bracket 12 can be attached to the power unit by fastening the attachment bolt 18 to the power unit side.

  On the other hand, the second mounting member 14 has a large-diameter, generally cylindrical shape, and is attached to the vehicle body via a bracket member (not shown). The first mounting bracket 12 is spaced apart from the opening on the upper side of the second mounting bracket 14, and the main rubber elastic body 16 is disposed between the opposing surfaces of the first mounting bracket 12 and the second mounting bracket 14. It is arranged.

  The main rubber elastic body 16 has a substantially truncated cone shape, and the outer peripheral surface of the first mounting member 12 is fixed to the end surface on the small diameter side, and the second outer peripheral surface on the large diameter side end portion. The inner peripheral surface of the mounting bracket 14 is fixed. Thereby, the first mounting bracket 12 and the second mounting bracket 14 are elastically connected via the main rubber elastic body 16, and the upper opening of the second mounting metal 14 is the main rubber elastic body 16. It is closed fluid tightly. In addition, an inverted mortar-shaped large-diameter recess 20 is formed on the large-diameter side end face of the main rubber elastic body 16 so as to open to the inside of the second mounting bracket 14. A thin seal rubber layer 22 is formed on the inner peripheral surface. In addition, a diaphragm 24 as a flexible film is disposed at the lower end of the second mounting bracket 14.

  The diaphragm 24 is formed of a thin rubber film that has a substantially circular shape and is easily deformable as a whole, and a large-diameter ring-shaped fixing fitting 26 is fixed to an outer peripheral edge portion. The fixing bracket 26 is inserted into the lower end portion of the second mounting bracket 14, and the second mounting bracket 14 is subjected to diameter reduction processing such as an eight-way drawing, whereby the fixing bracket 26 is interposed via the seal rubber layer 22. The second mounting bracket 14 is fixed in close contact. Thereby, the diaphragm 24 is fixed to the second mounting bracket 14, and the lower opening of the second mounting bracket 14 is fluid-tightly closed by the diaphragm 24.

  Further, a partition wall member 28 is disposed between the axially opposing surfaces of the main rubber elastic body 16 and the diaphragm 24 inside the second mounting bracket 14. As shown in FIG. 2, the partition member 28 has a substantially circular block shape as a whole, and is relatively made of a metal material such as an aluminum alloy or a synthetic resin material such as polypropylene (PP). It is formed using a material having high rigidity. The partition member 28 includes a partition metal member 30 as a partition member and a cover metal member 32 as a pressure receiving chamber side cover member.

  As shown in FIGS. 3 to 8, the partition fitting 30 has a substantially disk shape, and a circular accommodation recess 34 that opens upward is formed in the central portion in the radial direction. A central protrusion 36 that rises from the bottom wall portion projects from the radial central portion of the receiving recess 34, and an outer peripheral protrusion that protrudes radially inward from the peripheral wall portion of the receiving recess 34. A plurality of 38 are provided at equal intervals in the circumferential direction. Screw holes 40 are formed in the upper end surfaces of the central protrusion 36 and the outer peripheral protrusions 38.

  In addition, a plurality of communication ports 42 are provided in the middle portion in the radial direction of the bottom wall portion of the housing recess 34 so as to be spaced apart in the circumferential direction. The communication port 42 has a long hole shape extending in the circumferential direction, and three of them are arranged at equal intervals. Furthermore, a lower peripheral groove 44 that is open to the upper end surface and the outer peripheral surface and continuously extends in the circumferential direction with a predetermined length (a little less than a half circumference in this embodiment) is formed in the outer peripheral portion of the partition member 30. At the same time, an opening 46 is formed on one end side in the circumferential direction of the lower circumferential groove 44 and opens on the lower end surface of the partition member 30.

  On the other hand, the cover metal fitting 32 has a shallow, substantially bottomed cylindrical shape. An upper circumferential groove 48 is formed in the cylindrical portion of the cover metal fitting 32 so as to open to the outer peripheral surface and continuously extend in the circumferential direction with a predetermined length (in this embodiment, slightly less than one round). An opening 50 that opens to the inner wall surface is formed on one end side in the circumferential direction of 48, and a connection window 52 is formed on the other end side in the circumferential direction of the upper circumferential groove 48, so Open to the end face. In addition, a plurality of through holes 54 are provided in the center side of the bottom wall portion of the cover metal member 32 so as to be spaced apart in the circumferential direction, and the outer circumferential side of the bottom wall portion is formed in a longitudinal shape in the circumferential direction. A plurality of extending communication holes 56 are provided to be spaced apart in the circumferential direction. Further, a plurality of insertion holes 58 are provided at positions different from the communication holes 56 on the radial center portion of the bottom wall portion of the cover fitting 32 and the outer peripheral side of the bottom wall portion.

  The cover metal 32 is overlaid on the partition metal 30 from above, and the screw holes 40 of the partition metal 30 and the insertion holes 58 of the cover metal 32 are aligned with each other, and a plurality of fixing screws 59 are inserted into the insertion holes. 58 is inserted into each screw hole 40. Thus, the partition member 30 and the cover member 32 are fixed to each other while being aligned in the circumferential direction, so that the partition wall member 28 is configured. Further, the opening of the accommodation recess 34 of the partition metal 30 is covered with a cover metal 32. Further, the upper opening of the lower circumferential groove 44 of the partition fitting 30 is covered with the cover fitting 32, and the other circumferential ends of the lower circumferential groove 44 and the upper circumferential groove 48 of the cover fitting 32 are mutually connected. They are aligned and connected through the connection window 52. As a result, the upper peripheral groove 48 and the lower peripheral groove 44 are connected in series to form a peripheral groove that spirally extends the outer peripheral portion of the partition wall member 28 with a predetermined length.

  Prior to the assembly of the diaphragm 24 to the second mounting bracket 14, the partition wall member 28 is inserted into the second mounting bracket 14, and the second mounting bracket 14 is subjected to diameter reduction processing such as an eight-way stop. As a result, the partition member 28 is fixed in close contact with the second mounting member 14 via the seal rubber layer 22. As a result, the space between the axially opposed surfaces of the main rubber elastic body 16 and the diaphragm 24 inside the second mounting bracket 14 is fluid-divided by the partition member 28.

  On one side (upper side in FIG. 1) sandwiching the partition wall member 28, a part of the wall portion is composed of the main rubber elastic body 16, and between the first mounting bracket 12 and the second mounting bracket 14. A pressure receiving chamber 60 is formed in which pressure fluctuation is caused by the vibration input to. On the other side (lower side in FIG. 1) sandwiching the partition wall member 28, there is formed an equilibrium chamber 62 in which a part of the wall portion is constituted by the diaphragm 24 and volume change is easily allowed. . In the pressure receiving chamber 60 and the equilibrium chamber 62, for example, an incompressible fluid made of a low-viscosity fluid having a viscosity of 0.1 Pa · s or less such as water, alkylene glycol, or polyalkylene glycol is sealed.

  In addition, the upper and lower peripheral grooves 44 and 48 of the partition wall member 28 are fluid-tightly closed by the second mounting bracket 14 via the seal rubber layer 22, so that the outer peripheral portion of the partition wall member 28 is spirally predetermined. The orifice passage 64 is formed extending in the length (in the present embodiment, slightly less than one turn to slightly less than one turn). One end of the orifice passage 64 is connected to the pressure receiving chamber 60 through the opening 50 of the cover fitting 32, and the other end of the orifice passage 64 is connected to the equilibrium chamber 62 through the opening 46 of the partition fitting 30. Has been. As a result, the pressure receiving chamber 60 and the equilibrium chamber 62 are communicated with each other through the orifice passage 64, and a fluid flow occurs through the orifice passage 64 according to the pressure difference between the pressure receiving chamber 60 and the equilibrium chamber 62 due to vibration input. An anti-vibration effect based on a fluid action such as a resonance action of the fluid is exhibited. Note that the resonance frequency of the fluid flowing through the orifice passage 64 is set based on the passage cross section, the passage length, and the like. In this embodiment, the resonance frequency is in a low frequency range of about 10 Hz corresponding to, for example, an engine shake of an automobile. Is set.

  In addition, an annular housing recess 34 covered with the cover metal 32 in the partition metal 30 communicates with the pressure receiving chamber 60 through the through hole 54 and the communication hole 56 of the cover metal 32, and the communication port of the partition metal 30. 42 is in communication with the equilibration chamber 62. Here, prior to the assembly of the partition fitting 30 and the cover fitting 32, the accommodation recess 34 is overlapped with the bottom wall portion from the upper opening of the accommodation recess 34 on the pressure receiving chamber 60 side. An elastic rubber plate 66 as a closing rubber elastic plate is provided.

  As shown in FIGS. 9 and 10, the elastic rubber plate 66 has a substantially disk shape as a whole and is formed using a rubber elastic material. In addition, a substantially cylindrical central holding portion 68 as a central abutting holding portion is formed at the radial center portion of the elastic rubber plate 66. The central protrusion 36 of the partition fitting 30 is inserted into the inner hole 70 of the central holding portion 68, and the lower end surface of the central holding portion 68 is radially inward of the communication ports 42 in the bottom wall portion of the housing recess 34. The upper end surface of the central holding portion 68 is overlapped with the lower end surface radially inward of the through holes 54 in the bottom wall portion of the cover fitting 32.

  In addition, at the radially intermediate portion of the elastic rubber plate 66, there are three spoke-shaped holding portions 72 as spoke-shaped contact holding portions that extend radially from the central holding portion 68 toward the outer peripheral portion of the elastic rubber plate 66. It is formed at equal intervals in the circumferential direction. Each of the spoke-shaped holding portions 72 is formed on the bottom wall portion between each pair of communication ports 42 and 42 adjacent to each other in the circumferential direction of the housing recess 34, and the cover metal fitting 32 positioned so as to face the bottom wall portion in the axial direction. It arrange | positions between the bottom wall parts between the some through-holes 54. FIG.

  Further, a substantially annular seal lip 78 continuously extending in the circumferential direction as a seal protrusion is integrally formed on the outer peripheral side of the lower end surface of the elastic rubber plate 66, and each of the bottom wall portions of the housing recess 34 is formed. It is superimposed on the radially outer portion than the communication port 42. In short, the elastic rubber plate 66 is overlapped so as to cover the plurality of communication ports 42 of the partition member 30, and the outer peripheral edge portion of the elastic rubber plate 66 is more radial than the outer peripheral edge portion of each communication port 42. Located outside. Further, the outer peripheral edge portion of the elastic rubber plate 66 is located radially outward from each through hole 54 of the cover metal fitting 32, and is located radially inward from each communication hole 56. Further, the substantially entire shape excluding the protruding portion of the seal lip 78 on the lower end surface of the elastic rubber plate 66 has a substantially flat shape.

  Furthermore, the outer peripheral edge of the elastic rubber plate 66 of the present embodiment is formed with three substantially arc-shaped outer periphery holding portions 74 at equal intervals in the circumferential direction, and the circumferential central portion of each outer periphery holding portion 74 is formed. Further, it is in contact with the tip portion of each spoke-shaped holding portion 72 that extends radially outward from the central holding portion 68.

  The thickness dimensions of the central holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74 are substantially the same as each other, and the bottom wall portion of the cover fitting 32 and the bottom of the receiving recess 34 of the partition fitting 30 are provided. It is made larger than the dimension between the axially opposed surfaces of the wall portion (the axial separation distance between both bottom wall portions). As a result, the central holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74 are compressed and deformed between the axial directions of both bottom wall portions of the partition fitting 30 and the cover fitting 32 in the housing recess 34. The compression deformation state is held by the fixing force of the partition fitting 30 and the cover fitting 32, and the central holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74 are held by the partition wall member 28 with pressure. Further, the seal lip 78 of the elastic rubber plate 66 is also compressed and deformed, and is in closer contact with the radially outer portion than the plurality of communication ports 42 in the bottom wall portion of the housing recess 34. Further, the center holding portion 68 is elastically fitted and fixed to the center protrusion 36 of the partition metal fitting 30. Furthermore, the outer peripheral surface of the central portion in the circumferential direction of each outer peripheral holding portion 74 is in pressure contact with the radially inward protruding front end surface of each outer peripheral protrusion 38 of the partition fitting 30. As a result, the elastic rubber plate 66 is held in a state where the elastic rubber plate 66 is overlapped with the partition metal 30, and the plurality of communication ports 42 are closed fluid-tightly with the elastic rubber plate 66. As is clear from this, the contact holding portion that holds the overlapping state of the elastic rubber plate 66 on the partition metal fitting 30 of the present embodiment is the center holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74. And is formed integrally with the elastic rubber plate 66.

  On the other hand, an elastic valve portion 76 serving as an elastic deformation region is formed between each pair of spoke-shaped holding portions 72 and 72 adjacent in the circumferential direction of the elastic rubber plate 66. The elastic valve portion 76 has a substantially fan shape that widens outward from the radial center of the elastic rubber plate 66, and the inner peripheral edge 71 of the elastic valve portion 76 forms an outer peripheral edge (surface) of the central holding portion 68. The edge portions 73 on both sides in the circumferential direction of the elastic valve portion 76 are in contact with the circumferential ends (surfaces) of the spoke-shaped holding portions 72. In addition, the thickness dimension of each elastic valve part 76 is made smaller than the thickness dimension of the center holding part 68, the spoke-like holding part 72, and the outer peripheral holding part 74, so that the bottom wall part of the cover metal fitting 32 and the partition metal fitting 30. It is made smaller than the dimension between the axially opposed surfaces of the bottom wall portion of the housing recess 34, and each elastic valve portion 76 is attached to the cover metal fitting 32 in the overlapping direction of the elastic rubber plate 66 and the partition metal fitting 30. On the other hand, they are arranged to face each other at a predetermined distance.

  Further, a stepped portion 82 is integrally formed at a circumferential end portion of each outer peripheral holding portion 74 of the elastic rubber plate 66 via a notched groove portion 80 extending in the radial direction. The thickness dimension (height dimension) of the stepped portion 82 is made larger than the thickness dimension of the elastic valve portion 76 and made smaller than the thickness dimension of the outer peripheral holding portion 74. Then, the stepped portion 82 is spaced apart from the cover fitting 32 while the elastic rubber plate 66 is superimposed on the partition fitting 30.

  In particular, in the present embodiment, the outer peripheral edge of the elastic valve portion 76 is configured to include a central outer peripheral edge 75 at the center in the circumferential direction and a pair of end outer peripheral edges 77, 77 on the circumferential end side. The outer peripheral edge portion 75 is positioned radially outwardly from the inner peripheral edge portion of the outer peripheral holding portion 74 between the step portions 82 and 82 between the pair of outer peripheral holding portions 74 and 74 adjacent in the circumferential direction, and While being positioned radially inward from the outer peripheral edge portion of the holding portion 74, each end-side outer peripheral edge portion 77 enters the inside of the elastic rubber plate 66 from each circumferential end portion of the central outer peripheral edge portion 75. Thus, the circumferential end of the stepped portion 82, the stepped portion 82, and the inner peripheral edge of the outer peripheral holding portion 74 are in contact with each other. In short, in the present embodiment, the outer peripheral holding portion 74 and the stepped portion 82 are integrally formed with the end side outer peripheral edge 77 of the elastic valve portion 76. In addition, since the outer peripheral edge portions 75 and 77 of the elastic valve portion 76 are positioned radially inward from the respective communication holes 56 of the cover metal fitting 32, the respective communication holes 56 are connected to the outer peripheral edge of the elastic valve portion 76. The portions 75 and 77 are arranged at positions away from the axially facing portions. The central outer peripheral edge portion 75 of each elastic valve portion 76 is disposed opposite to each communication port 42 on the radially outer side of each communication port 42 of the partition member 30.

  In addition, an open recess 84 opens toward each elastic valve portion 76 of the elastic rubber plate 66 on the upper end surface of the bottom wall portion of the housing recess 34 of the partition member 30 that is overlapped with the lower end surface of the elastic rubber plate 66. Is formed. The open recess 84 has a substantially fan shape that is slightly smaller than each elastic valve portion 76 of the elastic rubber plate 66, and is disposed to face each elastic valve portion 76 in the overlapping direction of the elastic rubber plate 66 and the partition metal fitting 30. Thus, the entire opening of each open recess 84 is covered with each elastic valve portion 76. As a result, three closed gaps 86, 86, 86 are formed at equal intervals in the circumferential direction between the overlapping surfaces of the elastic rubber plate 66 and the partition member 30, and the outer peripheral edge of the elastic rubber plate 66 is sealed. Based on being in close contact with the bottom wall portion of the housing recess 34 via the lip 78, the housing recess 34 and the pressure receiving chamber 60 are separated from each other in a fluid-tight manner. In addition, each communication port 42 of the partition metal fitting 30 is positioned at the radially outer edge of the bottom wall portion of each open recess 84 at the center in the circumferential direction, and each closed gap 86 is connected to the communication port 42. Through the equilibrium chamber 62.

  In this case, a contact protrusion 88 is formed at a substantially central portion in the radial direction and circumferential direction of each elastic valve portion 76 of the elastic rubber plate 66. The contact protrusion 88 is formed of a rubber elastic material that is integrally formed with the elastic valve portion 76 and protrudes toward the cover metal fitting 32, and has a tapered shape with a tip portion having a substantially hemispherical shape. In addition, the height of the contact protrusion 88 is smaller than the height of the stepped portion 82, and the contact protrusion 88 is in a state where the elastic rubber plate 66 is overlaid on the partition metal fitting 30. The cover member 32 is spaced apart from the bottom wall portion between the circumferential directions of the through holes 54 with a distance greater than the separation distance between the step portion 82 and the cover member 32. In particular, each contact protrusion 88 of the present embodiment is disposed radially inward from each communication port 42 of the partition member 30.

  In such an elastic rubber plate 66, the pressure of the pressure receiving chamber 60 is exerted on the respective upper end surfaces of the elastic valve portion 76, the stepped portion 82, and the contact protrusion 88 through the through hole 54 and the communication hole 56 of the cover fitting 32. In addition, the pressure in the equilibrium chamber 62 is applied to the lower end surface of the elastic valve portion 76 through the closed gap 86 and the communication port 42 of the partition member 30, whereby the pressure receiving chamber 60 and the equilibrium chamber 62 are applied. The elastic valve portion 76, the stepped portion 82, and the contact protrusion 88 are deformed and displaced in accordance with the pressure difference. Further, the stepped portion 82 abuts against the cover fitting 32, so that the deformation displacement in the direction away from the partition fitting 30 in the vicinity of the end outer periphery 77 and the end outer periphery 77 of the elastic valve portion 76 is limited. It has become. Here, the abutment protrusion 88 abuts on the cover fitting 32, and the deformation displacement in the separation direction from the partition fitting 30 at the substantially central portion in the radial direction and the circumferential direction of the elastic valve portion 76 is limited. The elastic deformation limiting means in the central portion of the portion 76 is configured to include the contact protrusion 88 and the cover fitting 32.

  In the automobile engine mount 10 having the above-described structure, when a vibration in a high frequency range higher than a medium frequency corresponding to idling vibration, traveling booming sound, or the like is input, the vehicle is tuned to a lower frequency range. The orifice passage 64 is substantially closed due to the anti-resonant action of the flowing fluid. In the state where the amplitude of the high frequency vibration is about ± 0.05 to 0.1 mm, for example, and the fluctuation of the pressure difference between the pressure receiving chamber 60 and the equilibrium chamber 62 exerted on both the front and back surfaces of the elastic rubber plate 66 is small, The step portions 82 provided on both sides in the circumferential direction of the elastic valve portion 76 are in contact with the partition fitting 30.

  Here, as indicated by a two-dot chain line in FIGS. 11 and 12, each elastic valve portion 76 including the contact protrusion 88 is slightly deformed when the above-described high-frequency small-amplitude vibration is input. In particular, in the present embodiment, in a state in which no vibration is input as shown in FIG. 1, the contact protrusions 88 are arranged separately from the cover metal part 32, and the elastic valve parts 76 are arranged separately from the bottom wall part of the open recess 84. Therefore, when the elastic valve portion 76 is slightly deformed, the contact between the contact protrusion 88 and the cover fitting 32 and the contact between the elastic valve portion 76 and the partition fitting 30 can be positively avoided. Note that the separation distance between the elastic valve portion 76 and the bottom wall portion of the open recess 84 and the separation distance between the contact projection 88 and the cover metal fitting 32 are the elastic valve at the time of inputting high-frequency small-amplitude vibration to be vibration-proof. It is desirable that the elastic valve portion 76 and the contact protrusion 88 are set large enough not to contact the partition fitting 30 and the cover fitting 32 under the maximum deformation displacement state of the portion 76. Thereby, it is avoided that the amount of minute deformation of the elastic valve portion 76 is significantly limited by the contact with the cover metal fitting 32 or the contact with the partition metal fitting 30 via the contact protrusion 88. The desired anti-vibration effect (low dynamic spring effect) based on the hydraulic pressure absorption effect of the pressure receiving chamber 60 is stably obtained.

  On the other hand, when a low-frequency large-amplitude vibration having an amplitude corresponding to the engine shake is, for example, ± 1 to 2 mm is input, the elastic valve portion 76 increases toward the balance chamber 62 side as shown in FIGS. It is elastically deformed and comes into contact with the bottom wall portion of the open recess 84. That is, the height dimension of the closed gap 86 corresponding to the distance between the opposed surfaces of the elastic valve portion 76 and the bottom wall portion of the open recess 84 in the state where no vibration is input as shown in FIG. The elastic valve portion 76 at the time of input of amplitude vibration is made smaller than the maximum value that is deformed and displaced toward the bottom wall portion of the open recess 84. Thereby, the deformation | transformation displacement of the elastic valve part 76 is restrict | limited.

  In addition, the elastic rubber plate 66 has a deformation rigidity so that the stepped portion 82 is not greatly deformed and displaced so as to be separated from the partition metal fitting 30 and abut against the cover metal fitting 32 under the input of the low frequency large amplitude vibration. Thereby, for example, even when the central outer peripheral edge 75 of the elastic valve portion 76 is separated from the partition metal fitting 30 and the communication port 42 is opened, the elastic valve portion 76 is limited based on the deformation displacement restriction of the step portion 82. The displacement of the end-side outer peripheral edge 77 from the partition member 30 is suppressed. Thereby, the opening amount of the closed gap 86 with respect to the housing recess 34 is made sufficiently small, and the communication state through the communication port 42 of the pressure receiving chamber 60 and the equilibrium chamber 62 is substantially blocked by the elastic rubber plate 66. A significant pressure leak through the communication port 42 of the pressure receiving chamber 60 can be avoided.

  Further, for example, as shown by a two-dot chain line in FIGS. 13 and 14, the elastic rubber plate 66 and the partition member are arranged so that the abutting protrusion 88 abuts the cover metal member 32 when inputting low frequency large amplitude vibration. 28 may be designed, and thereby the deformation displacement of the elastic valve portion 76 and the opening amount of the closed gap 86 may be further limited.

  Therefore, when a low frequency large amplitude vibration corresponding to an engine shake or the like is input, the pressure fluctuation of the pressure receiving chamber 60 is prevented from escaping more than necessary through the communication port 42, and the pressure receiving pressure due to the deformation displacement of the elastic valve portion 76 is prevented. Since the fluid pressure absorption in the chamber 60 is also suppressed, a sufficient amount of fluid flowing through the orifice passage 64 is ensured, and the intended vibration isolation effect (high damping effect) can be stably obtained.

  Further, when an excessive or shocking vibration load having an amplitude of, for example, ± 2 mm or more is input, for example, when the automobile climbs over a step or runs on a road surface with large unevenness, the pressure in the pressure receiving chamber 60 and the equilibrium chamber 62 is increased. The fluctuation of the difference may become excessive, and the pressure in the pressure receiving chamber 60 may be greatly reduced. Here, the pressure that elastically deforms the elastic valve portion 76 in the direction away from the partition metal fitting 30 partitions the elastic rubber plate 66 by the contact holding portion including the central holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74. The force is sufficiently larger than the force that is held on the metal fitting 30 in an overlapping state, whereby the elastic valve portion 76 is greatly elastically deformed from the partition metal fitting 30 toward the pressure receiving chamber 60, and the contact protrusion 88. Is in contact with the cover metal fitting 32, so that the elastic deformation of the portion overlapped with the cover metal fitting 32 via the contact protrusion 88 of the elastic valve portion 76 is restricted, and the contact protrusion 88 of the elastic valve portion 76 is The distortion (elastic deformation) of the part which does not project is increased.

  Therefore, the contact protrusion 88 is provided at the substantially central portion in the radial direction and the circumferential direction in which the respective separation distances from the inner peripheral edge portion 71, the end edge portion 73, and the outer peripheral edge portions 75 and 77 of the elastic valve portion 76 are substantially equal. It has been. Further, the abutting holding portion including the central holding portion 68, the spoke-like holding portion 72 and the outer peripheral holding portion 74 in the elastic rubber plate 66 is thicker than the elastic valve portion 76 and is restrained by the partition member 28. Thus, the spring characteristics of the contact holding portions 68, 72, 74 are sufficiently harder than the spring characteristics of the elastic valve portion 76. Since the inner peripheral edge 71 and the end edge 73 of the portion 76 are in contact with each other, the spring characteristics of the inner peripheral edge 71 and the end edge 73 are compared with the spring characteristics of the outer peripheral edges 75 and 77 of the elastic valve portion 76. And hardened. Furthermore, the end-side outer peripheral edge 77 of the elastic valve portion 76 is in contact with the stepped portion 82 that is thicker than the outer peripheral holding portion 74 and the elastic valve portion 76, thereby the end-side outer peripheral edge 77 of the elastic valve portion 76. These spring characteristics are harder than the spring characteristics of the central outer peripheral edge 75.

  Accordingly, as shown in FIGS. 15 and 16, when the abutment protrusion 88 abuts against the cover fitting 32 and deformation deformation of the central portion of the elastic valve portion 76 is limited, the partitioning of the elastic valve portion 76 is performed. Distortions in the direction away from the metal fitting 30 are concentrated on the central outer peripheral edge 75 of the soft spring characteristic region of the elastic valve portion 76, and the end sides on both sides in the circumferential direction where the step 82 is disposed from the central outer peripheral edge 75. The extent that the stepped portion 82 abuts against the cover metal member 32 spreads to the outer peripheral edge portions 77 and 77, and the amount of deformation separating from the partition metal fitting 30 of the outer peripheral edge portions 75 and 77 of the elastic valve portion 76 can be ensured.

  In particular, in the present embodiment, the contact protrusion 88 is smaller than the elastic valve portion 76 and is provided at a substantially central portion in the radial direction and the circumferential direction of the elastic valve portion 76, as described above. Strain can be generated more efficiently on the outer peripheral edge portions 75 and 77 of the elastic valve portion 76. In addition, the pressure in the equilibrium chamber 62 is applied to substantially the entire lower end surface of the elastic valve portion 76 through the communication port 42 via the closed gap 86 that extends in the overlapping surface direction of the partition metal 30 and the elastic valve portion 76. Therefore, the amount of deformation in the direction away from the partition metal fitting 30 of the entire elastic valve portion 76 can be sufficient, and the center of the elastic valve portion 76 by the reliable contact of the contact protrusion 88 with the cover metal fitting 32 can be obtained. Due to the deformation restriction of the portion, the distortion of the elastic valve portion 76 can be more reliably exerted on the outer peripheral edge portions 75 and 77 side. In addition, since the communication port 42 of the partition member 30 is formed so as to open to the outer peripheral side with respect to the formation portion of the contact protrusion 88 in the elastic valve portion 76, the contact protrusion 88 contacts the cover member 32. Under the contact state, the pressure of the equilibrium chamber 62 through the communication port 42 is efficiently exerted on the outer peripheral side of the elastic valve portion 76, and the displacement of the outer peripheral edge portions 75 and 77 of the elastic valve portion 76 from the partition fitting 30 is reduced. Further increases can be achieved.

  In other words, in the automotive engine mount 10 of the present embodiment, the contact protrusion 88 is not simply provided to limit the elastic deformation of the elastic valve portion 76, but the deformation displacement of the central portion of the elastic valve portion 76 is not provided. Is provided at a position where the outer peripheral edge portions 75 and 77 are intentionally increased, and the displacement displacement amount of the outer peripheral edge portions 75 and 77 from the partition member 30, and thus the pressure receiving chamber 60 of the equilibrium chamber 62. A great technical feature resides in that the opening amount of the closed gap 86 in proportion to the hydraulic pressure release amount to the housing recess 34 is sufficiently large and obtained at an early stage. Therefore, the pressure receiving chamber 60 and the equilibrium chamber 62 can be quickly and reliably short-circuited through the communication port 42, and shocking abnormal noise and vibration caused by the generation of cavitation bubbles in the pressure receiving chamber 60 can be effectively suppressed.

  Further, in the present embodiment, (a) the contact holding portion including the central holding portion 68, the spoke-like holding portion 72, and the outer peripheral holding portion 74 provided around the elastic valve portion 76 is provided between the cover fitting 32 and the partition fitting 30. And (b) the stepped portion 82 abuts against the cover metal 32 when the elastic valve portion 76 is elastically deformed so as to be largely separated from the partition metal 30, or (c) elasticity. The valve portion 76 is disposed opposite to the bottom wall portion of the open recess 84 of the partition member 30 constituting the closed gap 86 and contacts the bottom wall portion according to the pressure difference between the pressure receiving chamber 60 and the equilibrium chamber 62. (D) The contact protrusion 88 is integrally formed with the elastic valve portion 76, and when the elastic valve portion 76 is elastically deformed so as to be largely separated from the partition member 30, the contact protrusion 88 is formed by the cover member 32. The elastic valve portion 76 is brought into contact with the Nonlinear means to further harden the elastic properties nonlinearly with increasing the amount of elastic deformation of the elastic valve portion 76 is constructed elastic properties as a nonlinear that. Thereby, the minute deformation action of the elastic valve part 76 at the time of the high frequency small amplitude vibration and the deformation limiting action of the elastic valve part 76 at the time of the low frequency large amplitude vibration can be exhibited more advantageously.

  In addition, in the present embodiment, the central holding portion 68 is fixedly attached to the partition member 30, and extends in the circumferential direction from the tip portion of the spoke-like holding portion 72 that extends from the central holding portion 68 to the outer peripheral side. In this way, the outer peripheral holding part 74 is provided, and the spring characteristics of the spoke-like holding part 72 and the outer peripheral holding part 74 are the elastic valve surrounded by the spoke-like holding part 72 and the outer peripheral holding part 74 in the elastic rubber plate 66. It is hardened compared with the spring characteristic of the part 76. FIG. As a result, the fixing force of the central holding portion 68 to the partition member 30 is transmitted as a contact holding force to each outer peripheral holding portion 74 via the plurality of spoke-like holding portions 72, and the elastic rubber plate 66. The overlapping state with respect to the partition member 30 is more effectively maintained, and the desired deformation action of the elastic valve portion 76 can be obtained more stably.

  Several automotive engine mounts having different forms from the automotive engine mount 10 of the first embodiment will be described below with respect to the fluid-filled vibration isolator of the present invention. About the member and site | part made into the substantially same structure, those detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  That is, FIG. 17 shows a main part of an automobile engine mount as a second embodiment of the present invention. The bottom wall portion of the housing recess 34 of the partition fitting 30 has a flat shape, and the recess opens at the lower end surface of each elastic valve portion 76 of the elastic rubber plate 92 toward the bottom wall portion of the housing recess 34. 94 is formed and the outer peripheral edge of the elastic rubber plate 92 is overlapped with the bottom wall of the receiving recess 34, and the recess 94 is covered with the bottom wall of the receiving recess 34. Is formed.

  The contact protrusion 98 is integrally formed with the cover fitting 32 and protrudes toward the elastic rubber plate 92, and the diameter of the elastic valve portion 76 is in a state where the elastic rubber plate 92 is superimposed on the partition fitting 30. It is opposed to the central portion in the direction and the circumferential direction with a predetermined distance.

  According to such a second embodiment, when an excessive or shocking vibration load is input, the central portion of the elastic valve portion 76 is in contact with the abutting protrusion of the cover fitting 32 as shown by a two-dot chain line in FIG. 98, the distortion in the direction away from the partition metal fitting 30 of the elastic valve portion 76 is efficiently generated on the outer peripheral edge portions 75 and 77 side, whereby the pressure receiving chamber is formed as in the first embodiment. A sufficient relief amount of 60 and the equilibrium chamber 62 can be realized at an early stage, and cavitation can be effectively prevented.

  In particular, in this embodiment, durability can be improved because the contact protrusion 98 is integrally formed with the hard cover fitting 32. In addition to the fact that the recess 94 can be easily realized using the shape of the elastic rubber plate 92, the recess 94 and the contact protrusion 98 are not integrally provided on the elastic rubber plate 92. The structure of the mold of the elastic rubber plate 92 can be simplified.

  Moreover, the structure like the engine mount for motor vehicles as 3rd embodiment of this invention which employ | adopted the elastic rubber plate 100 as shown by FIG. 18, 19 is also employable. That is, the elastic rubber plate 100 has a structure in which a reinforcing metal fitting 104 as a reinforcing member that is harder than the rubber plate 102 is fixedly embedded in a flat rubber plate 102 having a substantially constant thickness. ing.

  More specifically, a small-diameter boss-like portion 106 as a central abutment holding portion is formed in the central portion in the radial direction of the reinforcing metal fitting 104, and is disposed around the inner hole 70 in the radial center of the rubber plate 102. Yes. In addition, a plurality of spoke-like portions 108 serving as spoke-like contact holding portions extending radially from the boss-like portion 106 from the radial center of the rubber plate 102 to the outside are arranged, and the tip of the spoke-like portion 108 Divided rim-shaped portions 110 extending in a circular arc shape in the circumferential direction are integrally formed in the portion, and are arranged along the outer peripheral edge portion of the rubber plate 102, respectively. In addition, the elastic valve portion 76 is configured by a substantially fan-shaped portion where the reinforcing metal fitting 104 is not disposed in the rubber plate 102. Furthermore, a notch-shaped portion 112 is formed at the tip end portion of the spoke-shaped portion 108 that extends radially outward from the boss-shaped portion 106, in other words, at the outer peripheral edge portion of the circumferential central portion of the divided rim-shaped portion 110. .

  Further, a strip portion 114 as an extension holding portion is integrally formed so as to extend in the circumferential direction from the circumferential end portion of the divided rim-shaped portion 110 toward the elastic valve portion 76, and the strip portion 114 is formed as a single piece. The rigidity is reduced by being smaller than the divided rim-shaped portion 110. The elastic characteristics of the end outer peripheral edge 77 of the elastic valve portion 76 are made harder than the elastic characteristics of the central outer peripheral edge 75 by the low rigidity portion of the reinforcing metal fitting 104 formed of the narrow piece 114.

  In such an elastic rubber plate 100, as shown in FIG. 20, each elastic valve portion 76 is overlaid on the bottom wall portion of the housing recess 34 so as to cover each open recess 84 of the partition metal 30. In this state, all the portions including the contact protrusions 88 provided at the radial and circumferential central portions of the elastic valve portion 76 are arranged to face the cover metal member 32 at a predetermined distance.

  Here, the boss 106 of the reinforcing metal fitting 104 is fitted and fixed to the central projection 36 of the partition metal 30 via the rubber plate 102, and each notch 112 of the reinforcing metal fitting 104 is fixed to the rubber plate. The elastic rubber plate 100 is partially restrained by the partition fitting 30 via the reinforcing fitting 104 by being fitted and fixed to the respective outer peripheral projections 38 of the partition fitting 30 via 102. The superposed state is maintained.

  That is, in the automobile engine mount of the third embodiment, the contact protrusion 88 is provided at the central portion of the elastic valve portion 76, so that the pressure receiving pressure is the same as in the first and second embodiments. A sufficient relief amount between the chamber 60 and the equilibration chamber 62 can be realized at an early stage so that cavitation can be effectively prevented, and in particular, a contact that holds the overlapping state of the elastic rubber plate 100 on the partition member 30. Since the holding portion is constituted by the reinforcing metal fitting 104, the durability can be further improved while securing the deformation characteristics of the elastic valve portion 76. In addition, since the elastic rubber plate 100 is held only by the partition fitting 30, for example, due to a difference in dimensions between the partition fitting 30 and the cover fitting 32, variation in screwing force of the fixing screws 59 to the partition fitting 30, or the like. Thus, it is possible to avoid problems such as it becomes difficult to obtain the holding force of the abutting holding portion uniformly throughout.

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

  For example, in the above-described embodiment, the elastic rubber plates 66, 92, 100 are superimposed on the partition metal fitting 30 and protruded from one of the elastic rubber plates 66, 92, 100 and the cover metal fitting 32 in the initial state where no vibration is input. The contact protrusions 88 and 98 are spaced apart from the other, but may be in contact. Then, the elastic valve portion may be separated from the partition fitting in accordance with the vibration input, and the contact protrusion may contact the other, so that the elastic deformation limiting function of the central portion of the elastic valve portion may be exhibited. In the initial state where the contact protrusion is in contact with the other, considering the effective deformation characteristics of the elastic valve portion at the time of inputting high frequency small amplitude vibration, the contact protrusion is not compressed and deformed. It is preferable to abut.

  Further, the contact protrusions 88 and 98 are not limited to the illustrated form, and for example, two or more contact protrusions that limit the deformation amount of each elastic valve part are provided, or the contact protrusions are elastic. It may be provided on both the valve part and the cover metal part, and both contact protrusions may be brought into contact with each other, or may be separately brought into contact with the elastic valve part and the cover metal part.

  Furthermore, the contact protrusion made of a rigid member or a rubber material may be formed separately from the elastic valve portion and the cover metal fitting, and fixed to at least one of the elastic valve portion and the cover metal fitting. As a specific example, a part of the reinforcing metal fitting of the third embodiment may be extended to the elastic valve portion, and the extended portion may be protruded from the rubber plate toward the cover metal fitting, thereby forming the contact holding portion. . In order to reduce the contact sound between the contact protrusion and the cover metal, it is desirable that a rubber layer is fixed to at least one of the contact protrusion and the cover metal.

  Further, in addition to the outer peripheral holding portion 74, the stepped portion 82, the divided rim-shaped portion 110, and the strip portion 114 in the elastic rubber plates 66, 92, and 100, between the overlapping surfaces of the elastic rubber plates 66, 92, and 100 and the partition fitting 30. The closed gaps 86, 96, etc. formed in are not essential constituent requirements.

  In the embodiment, the central holding portion 68 of the elastic rubber plates 66, 92, 100 and the boss-like portion 106 of the reinforcing metal fitting 104 are fitted and fixed to the central protrusion 36 of the partition metal fitting 30, and the central holding portion 68. Or the spoke-shaped holding portion 72 is held by the partition wall member 28, or the spoke-shaped portion 108 of the reinforcing metal fitting 104 is supported between the boss-like portion 106 and the outer peripheral projection 38 of the partition metal fitting 30, thereby being elastic. Although the contact holding | maintenance part to the partition metal fitting 30 of the rubber plates 66, 92, and 100 was comprised, for example, the radial direction center part in the elastic rubber plate and a plurality of parts extending radially from the radial direction center part are covered. It is also possible to configure the contact holding portion by fixing with at least one of the metal fitting and the partition metal fitting with a screw or a bolt.

  In the automobile engine mount 10 of the above-described embodiment, the structure in which the single orifice passage 64 is provided is employed, but a plurality of orifice passages may be employed.

  In addition, in the above-described embodiment, specific examples of the present invention applied to an engine mount for automobiles have been described. However, the present invention is not limited to automobile bodies, differential mounts, suspension member mounts, suspension bushes, etc. Any of the above can be applied to the fluid-filled vibration isolator for isolating the various vibrators.

It is a longitudinal cross-sectional view which shows the engine mount for motor vehicles as 1st embodiment of this invention, Comprising: The figure corresponding to the II cross section of FIG. The top view which shows the state which assembled | attached the elastic rubber board to the partition member which comprises a part of engine mount for motor vehicles of FIG. The top view which shows the state which assembled | attached the elastic rubber board to the partition metal fitting which comprises a part of partition member of FIG. The top view of the partition metal fitting of FIG. The bottom view of the partition metal fitting of FIG. The VI-VI arrow line view of FIG. VII-VII sectional drawing of FIG. VIII-VIII sectional drawing of FIG. The top view of the elastic rubber board of FIG. XX sectional drawing of FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles of FIG. XII-XII sectional drawing of FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles of FIG. 1, and shows one operation state different from FIG. XIIII-XIIII sectional drawing of FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles of FIG. 1, and shows one operation state different from FIG.11 and FIG.13. XVI-XVI sectional drawing of FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles as 2nd embodiment of this invention. The top view of the elastic rubber board employ | adopted as the engine mount for motor vehicles as 3rd embodiment of this invention. XVIIII-XVIIII sectional drawing of FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles which employ | adopted the elastic rubber board of FIG.

Explanation of symbols

10: Automotive engine mount, 12: First mounting bracket, 14: Second mounting bracket, 16: Rubber elastic body, 24: Diaphragm, 30: Partition bracket, 32: Cover bracket, 42: Communication port, 60 : Pressure receiving chamber, 62: Equilibrium chamber, 64: Orifice passage, 66: Elastic rubber plate, 68: Center holding part, 72: Spoke-like holding part, 75: Center outer peripheral edge part, 76: Elastic valve part, 77: End side Outer peripheral edge, 88: contact protrusion

Claims (9)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and a pressure receiving chamber in which a part of the wall portion is configured by the main rubber elastic body and a part of the wall portion is a flexible film. In a fluid-filled vibration isolator having a configured equilibrium chamber, in which an incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber, and an orifice passage is provided to communicate the pressure receiving chamber and the equilibrium chamber with each other. ,
A communication port that connects the pressure receiving chamber and the equilibrium chamber is formed in the partition member that partitions the pressure receiving chamber and the equilibrium chamber, and the communication port is overlapped from the pressure receiving chamber side to close the communication port. A closing rubber elastic plate is disposed so that the pressure of the pressure receiving chamber is exerted on one surface of the closing rubber elastic plate and the pressure of the equilibrium chamber is exerted on the other surface through the communication port, A contact holding portion that is held in an overlapping state with respect to the partition member in the closing rubber elastic plate is moved from a central contact holding portion located at a central portion of the closing rubber elastic plate to an outer peripheral side from the center contact holding portion. A plurality of spoke-shaped contact holding portions extending radially, and a region between the circumferential directions of the spoke-shaped contact holding portions adjacent in the circumferential direction in the closed rubber elastic plate is defined as the pressure receiving chamber and the equilibrium chamber. Elasticity based on the pressure difference As the elastic deformation region to be formed, the communication port is brought into a communication state through the outer peripheral edge of the elastic deformation region by elastically deforming the elastic deformation region in a direction away from the partition member. The elastic deformation region includes elastic deformation limiting means for limiting a displacement amount in a direction away from the partition member at a central portion separated from both the spoke-shaped contact holding portion and the outer peripheral edge on both sides in the circumferential direction. A fluid-filled vibration isolator characterized by being provided.   A pressure receiving chamber side cover member that covers the elastic deformation region of the closing rubber elastic plate at a distance from the pressure receiving chamber side is provided, and one surface is provided on the opposing surface of the elastic deformation region and the pressure receiving chamber side cover member. A contact protrusion that protrudes toward the other end and faces the other end with a predetermined distance from the other, and the elastic deformation region is elastically deformed so as to be separated from the partition member and to be contacted. The fluid-filled vibration isolator according to claim 1, wherein the elastic deformation limiting means is configured by a protrusion abutting against the other.   The communication port of the partition member is formed so as to open to the outer peripheral side of the elastic deformation region of the closing rubber elastic plate and the formation portion of the contact protrusion on the opposing surface of the pressure receiving chamber side cover member. The fluid-filled vibration isolator according to claim 2.   A closed gap that extends between the overlapping surfaces of the partition member and the elastic deformation region of the closing rubber elastic plate is formed, and the communication port of the partition member is connected to the closed gap so that the communication is established. The fluid filled type vibration damping device according to any one of claims 1 to 3, wherein a pressure of the equilibrium chamber exerted through a mouth is exerted on the elastic deformation region through the closed clearance.   A reinforcing member integrally including the central abutting holding portion and the plurality of spoke-like abutting holding portions is employed, and the elastic deformation of the closing rubber elastic plate is partially suppressed by the reinforcing member, thereby The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein a contact holding portion is configured.   6. The contact holding portion is configured by integrally forming the central contact holding portion and the plurality of spoke-like contact holding portions on the closing rubber elastic plate. The fluid-filled vibration isolator described in 1.   A pressure receiving chamber side cover member that covers the blocking rubber elastic plate at a distance from the pressure receiving chamber side is provided, and the pressure receiving chamber side cover member includes the pressure receiving chamber side cover member and the closing rubber elastic plate. 7. A communication hole for connecting an internal region between the pressure receiving chambers is provided at a position away from a portion facing the outer peripheral edge of the elastic deformation region in the closed rubber elastic plate. The fluid-filled vibration isolator according to the item.   The orifice passage is formed so as to extend in the circumferential direction of the outer peripheral portion of the partition member while the closing rubber elastic plate is disposed so as to overlap the central portion of the partition member. The fluid-filled vibration isolator according to any one of 7.   An annular sealing protrusion that protrudes on the surface facing the partition member and extends continuously over the entire circumference in the circumferential direction is integrally formed on the outer peripheral portion of the closing rubber elastic plate. The fluid-filled vibration isolator according to any one of claims 1 to 8, wherein the seal protrusion is in contact with the partition member in a state where the plate is superposed on the partition member.

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