JP6134208B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator used for an engine mount or the like of an automobile.

  2. Description of the Related Art Conventionally, a fluid-filled vibration isolator that utilizes the flow action of an incompressible fluid enclosed therein is known as a type of vibration isolator used in an engine mount of an automobile. In this fluid-filled vibration isolator, for example, as disclosed in Japanese Patent Application Laid-Open No. 2008-196630 (Patent Document 1) and the like, the first mounting member and the second mounting member are elasticized by the main rubber elastic body. The main liquid chamber and the sub liquid chamber are formed on both sides of the partition member supported by the second mounting member and the incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber. ing. Furthermore, an orifice passage is formed in which the main liquid chamber and the sub liquid chamber communicate with each other, and a vibration isolation effect is exhibited based on the resonance action of the fluid flowing through the orifice passage.

  By the way, in the fluid-filled vibration isolator, for the purpose of further improving the vibration isolating performance, a fluid flow path that connects the main liquid chamber and the sub liquid chamber to each other is provided, and a storage space formed on the fluid flow path There has also been proposed a structure in which a movable member is arranged in the fluid channel so that communication and blocking of the fluid flow path can be switched by the movable member. That is, in Patent Document 1, the fluid flow path is configured to include a communication port formed in the upper and lower wall portions of the housing space, and is a movable member that is housed and arranged in a state in which vertical displacement is allowed in the housing space. However, the fluid flow path is blocked by covering either the upper or lower communication port.

  However, in the movable member of Patent Document 1, the first and second soundproof members are arranged above and below the movable plate that covers the communication port in order to reduce the hitting sound caused by contact with the inner surfaces of the upper and lower walls of the housing space. Furthermore, it has a complicated structure in which a projecting piece for relatively positioning the movable plate and the first and second soundproof members is provided, and the structure is not simple and easy to manufacture.

JP 2008-196630 A

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that the vibration isolation characteristics can be switched by a simple structure with a small number of parts, and abnormal noise at the time of switching is also reduced. 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.

  That is, in the first aspect of the present invention, the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and the partition member supported by the second mounting member is sandwiched. A main liquid chamber and a sub liquid chamber are formed on both sides, an incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and an orifice passage that communicates the main liquid chamber and the sub liquid chamber with each other. On the other hand, the partition member is formed with a fluid flow path that allows the main liquid chamber and the sub liquid chamber to communicate with each other, and a movable member is disposed in a storage space provided on the fluid flow path. In the fluid-filled vibration isolator, the movable member is provided with a pair of elastic plates that are supported by the partition member and arranged to be spaced apart from each other, and communicate with the set of elastic plates, respectively. Holes are formed, and the communication holes are a pair of the elastic plates. The pair of elastic plates are relatively displaced by the hydraulic pressure and overlap each other on the inner wall surface of the housing space so that at least one of the communication holes is covered. Thus, the fluid flow path is blocked.

  According to the fluid-filled vibration isolator configured as described above according to the first aspect, the communication holes respectively formed in the pair of elastic plates are positioned so as not to overlap each other in the opposing direction of the pair of elastic plates. Since the openings are open, at least one of the communication holes is covered by a pair of elastic plates overlapping each other on the inner wall surface of the housing space. Therefore, with a simple member having a set of elastic plates, the fluid flow path is switched between communication and blocking, for example, a high damping effect based on the fluid action of the fluid flowing through the orifice passage, The low dynamic spring effect by allowing fluid flow through the fluid flow path is effectively exhibited according to the input vibration.

  Further, when the fluid flow path is interrupted, the other elastic plate is interposed between the one elastic plate displaced by the hydraulic pressure and the inner wall surface of the housing space, so that the one elastic plate and the inner wall surface of the housing space The abnormal noise due to hitting is reduced based on the buffering action of the other elastic plate. As a result, the fluid flow path is blocked according to the amplitude of the input vibration, regardless of whether the liquid pressure in the main liquid chamber is relatively high or low with respect to the liquid pressure in the sub liquid chamber, The effect of reducing the hitting sound by the buffering action of the elastic plate is effectively exhibited.

  In addition, when a pair of elastic plates are displaced relative to each other by the hydraulic pressure, the impact at the time of contact is based on frictional resistance acting between the pair of elastic plates or internal friction due to elastic deformation of each elastic plate. Since the energy is efficiently reduced, the hitting sound is effectively reduced.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the pair of elastic plates are in contact with each other and opposed to the inner wall surfaces of the housing space. Is.

  According to the second aspect, the pair of elastic plates are accommodated in advance in contact with the wall inner surface of the accommodation cavity in a state of being disposed in the accommodation cavity, so that the pair of elastic plates are accommodated when the hydraulic pressure is applied. It is possible to prevent the hitting sound from being generated by preventing hitting the inner wall of the empty space.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the first or second aspect, the movable member includes a connection portion that connects the pair of elastic plates to each other. It is.

  According to the third aspect, since the set of elastic plates are connected to each other by the connecting portion, the set of elastic plates can be handled integrally, and the elastic plates can be accommodated in the accommodation space. Installation work and the like are facilitated. The connecting portion may be formed separately from the set of elastic plates, and may be fixed to the set of elastic plates after molding, but is preferably integrated as shown in the following fourth mode. Structure is adopted.

  According to a fourth aspect of the present invention, in the fluid filled type vibration damping device described in the third aspect, a pair of the elastic plate and the connection portion are integrally formed of a rubber elastic body.

  According to the fourth aspect, since the pair of elastic plates and the connection portion are integrally formed, the movable member can have a simple structure with a small number of parts. In addition, since the pair of elastic plates is formed of a rubber elastic body, it is possible to effectively obtain a sound reduction effect when the fluid flow path is interrupted based on the energy damping action due to internal friction. In addition, since the connection portion is formed of a rubber elastic body, the switching of the fluid flow path from the shut-off state to the communication state is smoothly realized using the elasticity of the connection portion.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator described in the fourth aspect, the connection portion is thicker than the pair of elastic plates.

  According to the fifth aspect, when the connection portion that connects the pair of elastic plates is made thick, the elastic plate is quickly moved by the elastic force of the connection portion when the shut-off state of the fluid flow path is released. To the initial position. In addition, if the thickened connecting portion is supported by the partition member, the durability of the support portion can be improved, and the movable member can be stably positioned with respect to the partition member.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in the fourth or fifth aspect, the surface of the connecting portion connected to the opposing surface of the pair of elastic plates is a concave curve. It has a cross-sectional shape.

  According to the sixth aspect, when the pair of elastic plates are relatively displaced by the hydraulic pressure, the stress concentration on the surface of the connecting portion is alleviated, and sufficient durability is ensured even for repeated input. The In addition, in a state where the pair of elastic plates is moved close to each other by the hydraulic pressure, the elastic force of the connection portion connected to the opposing surface of the pair of elastic plates acts in a direction to relatively separate the pair of elastic plates. Therefore, when the hydraulic pressure is released, the pair of elastic plates is quickly restored to the initial position based on the elasticity of the connecting portion.

  According to a seventh aspect of the present invention, in the fluid-filled vibration isolator described in any one of the third to sixth aspects, the connection portion is formed by the partition member in the opposing direction of the pair of elastic plates. It is what is pinched.

  According to the seventh aspect, since the set of elastic plates is indirectly supported by the partition member by the connection portion being held by the partition member, the durability of the set of elastic plates is advantageously ensured. Is done. And since the connection part which connects a set of elastic boards is easy to be comparatively thick, durability of connection part itself is securable.

  According to an eighth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the third to seventh aspects, the outer peripheral ends of the pair of elastic plates are connected to each other by the connecting portion. It is what has been.

  According to the eighth aspect, in a structure in which a set of elastic plates is connected by a connecting portion, a large free length of the set of elastic plates is ensured. The fluid flow path can be stably switched between communication and blocking.

  According to a ninth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the third to seventh aspects, intermediate portions of the pair of elastic plates are connected to each other by the connecting portion. It is what.

  According to the ninth aspect, the free length of the elastic plate can be easily adjusted by the formation position of the connection portion, and the switching characteristic between the communication state and the cutoff state of the fluid flow path can be easily changed by the formation position of the connection portion in the movable member. Can be set to Further, for example, by forming communication holes in a pair of elastic plates on both sides of the connection part, fluid flow paths are set on both sides of the connection part, and these fluid flow paths are formed by one movable member. Each can be switched between a communication state and a blocking state. In addition, if the position of the connecting portion and the position of the communication hole in the set of elastic plates are appropriately set and the switching characteristics of the fluid flow paths are made different, it is possible to realize a higher level of vibration isolation performance. Could be possible.

  According to a tenth aspect of the present invention, in the fluid-filled vibration isolator described in the eighth or ninth aspect, the communication hole formed in one of the elastic plates has the connection portion in the one elastic plate. And the communication hole formed in the other elastic plate is located on the opposite side of the connecting portion of the other elastic plate.

  According to the tenth aspect, since the communication hole of one elastic plate and the communication hole of the other elastic plate are arranged far apart, the cross-sectional area, shape, number of formation, etc. of each communication hole can be set freely. It becomes easy. In particular, in the structure in which the connecting portion side is supported by the partition member, the communication hole of the other elastic plate is formed on the side opposite to the connecting portion that is easily displaced by the hydraulic pressure. When the elastic plate is relatively displaced, the elastic plate is quickly covered by the contact of the elastic plate, and the fluid flow path is stably blocked.

  An eleventh aspect of the present invention is the fluid-filled vibration damping device according to any one of the third to tenth aspects, wherein the distance between the opposing surfaces of the pair of elastic plates in the movable member is the above-described distance. As the distance from the connecting portion increases, the pair of elastic plates are pressed against the inner wall of the housing space opposite to each other by the arrangement of the movable member with respect to the housing space of the partition member. The ends of the pair of elastic plates located on the remote side with respect to the portion are made to approach each other.

  According to the eleventh aspect, the pair of elastic plates are stably pressed against the inner surface of the wall of the housing space by their own elasticity, so that the pair of elastic plates are moved to the wall of the housing space at the time of vibration input. It is possible to prevent a hitting sound from being hit against the inner surface. In addition, such a hitting prevention effect can be easily obtained by devising the shape of the elastic plate in a single state, and the addition of special members and the complication of the structure can be avoided.

  According to the present invention, the communication holes are respectively formed in the pair of elastic plates disposed in the accommodation space of the partition member, and the communication holes formed in the elastic plates are opened at different positions. Therefore, the pair of elastic plates are relatively displaced by the relative fluid pressure fluctuations of the main liquid chamber and the sub liquid chamber and overlap each other on the inner wall surface of the housing space, so that at least the communication hole is formed. One is covered. Thereby, the communication of a fluid flow path and interruption | blocking can be switched by the movable member of a simple structure provided with a set of elastic boards. In addition, when one elastic plate is displaced by the hydraulic pressure, the other elastic plate abuts against the wall inner surface of the accommodation cavity due to the hydraulic pressure, so that one elastic plate is abutted against the wall inner surface of the accommodation cavity. The hitting sound generated by this is reduced by the buffering action of the other elastic plate.

The longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention. The perspective view which looked at the partition member main body which comprises the engine mount shown by FIG. 1 from diagonally downward. The top view of the partition member main body shown by FIG. The bottom view of the partition member main body shown by FIG. The top view of the cover member which comprises the engine mount shown by FIG. The perspective view which looked at the movable member which comprises the engine mount shown by FIG. 1 from diagonally upward in the single-piece | unit state. The front view of the movable member shown by FIG. The top view of the movable member shown by FIG. The perspective view which changed the movable member shown by FIG. 6 into the mounting state, and was seen from diagonally upward. The front view of the movable member shown by FIG. The top view of the movable member shown by FIG. FIG. 2 is a longitudinal sectional view showing a main part of the engine mount shown in FIG. 1, where (a) shows a state in which a positive pressure is applied to a pressure receiving chamber by input of large amplitude vibration, and (b) shows a state of large amplitude vibration. A state in which a negative pressure is exerted on the pressure receiving chamber by the input is shown, and (c) shows an input state of small amplitude vibration. The perspective view which looked at the movable member which comprises the fluid enclosure type vibration isolator as 2nd embodiment of this invention from diagonally upward in the single-piece | unit state. The front view of the movable member shown by FIG. The top view of the movable member shown by FIG. It is a longitudinal cross-sectional view which shows the principal part of the fluid enclosure type vibration isolator as 3rd embodiment of this invention, Comprising: (a) is the state by which the positive pressure was exerted on the receiving pressure chamber by the input of large amplitude vibration, (B) shows a state in which a negative pressure is applied to the pressure receiving chamber by the input of large amplitude vibration, and (c) shows an input state of the small amplitude vibration. The longitudinal cross-sectional view which shows the principal part of the fluid enclosure type vibration isolator as 4th embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an engine mount 10 for an automobile as a first embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount 10 has a structure in which a first attachment member 12 and a second attachment member 14 are elastically connected by a main rubber elastic body 16, and the first attachment member 12 is attached to a power unit (not shown). The second attachment member 14 is attached to a vehicle body (not shown). In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting member 12 is a high-rigidity member formed of a metal such as iron or an aluminum alloy, and includes a screwed portion 18 having a small-diameter, generally cylindrical shape, and a substantially conical cone in the opposite direction. A fixing portion 20 having a trapezoidal shape and integrally formed above the screwing portion 18 is integrally provided. Furthermore, the screwing portion 18 is formed with a screw hole 22 that opens in the lower surface and extends vertically in the axial direction, and a thread is threaded on the inner peripheral surface.

  On the other hand, the second mounting member 14 has a thin, large-diameter, generally cylindrical shape, and has a stepped shape having a stepped portion 24 at an axially intermediate portion, with the upper portion sandwiching the stepped portion 24 having a large diameter. A cylindrical portion 26 is provided, and a lower portion sandwiching the stepped portion 24 is a small-diameter cylindrical portion 28. Further, a caulking piece 30 is integrally formed over the entire circumference above the large-diameter cylindrical portion 26 of the second mounting member 14.

  And the 2nd attachment member 14 is arrange | positioned so that the outer peripheral side of the 1st attachment member 12 may surround, and these 1st attachment members 12 and the 2nd attachment member 14 mutually mutually with the main body rubber elastic body 16 Elastically connected. The main rubber elastic body 16 is a substantially tapered cylindrical rubber elastic body that gradually expands downward, and the fixing portion 20 of the first mounting member 12 is vulcanized and bonded to the inner peripheral surface of the small-diameter side end portion. In addition, the large-diameter side end portion is vulcanized and bonded to the stepped portion 24 and the small-diameter cylindrical portion 28 of the second mounting member 14. In the present embodiment, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14. Further, the upper surface of the fixing portion 20 of the first mounting member 12 is covered with a buffer rubber layer 31 integrally formed with the main rubber elastic body 16, and a hitting sound is generated due to contact with a partition member 42 described later. It is prevented.

  Further, a stopper rubber 32 is integrally formed on the inner peripheral surface of the large-diameter end of the main rubber elastic body 16 and protrudes toward the inner peripheral side of the small-diameter cylindrical portion 28 of the second mounting member 14. Then, the first mounting member 12 and the second mounting member 14 come into contact with each other via the stopper rubber 32, so that the relative displacement amount of the first mounting member 12 and the second mounting member 14 in the direction perpendicular to the axis can be reduced. Stopper means for limiting is configured. Furthermore, the covering rubber layer 34 extends from the outer peripheral surface of the large-diameter end of the main rubber elastic body 16, and the inner peripheral surface of the large-diameter cylindrical portion 26 of the second mounting member 14 is covered by the covering rubber layer 34. Covered.

  A flexible film 36 is attached to the second attachment member 14. The flexible membrane 36 is formed of a rubber elastic body having a thin and large-diameter substantially disk shape or circular dish shape, and a cylindrical fixing member 38 is vulcanized and bonded to the outer peripheral end portion. The inner peripheral surface of the fixing member 38 is covered with a seal rubber layer 39 formed integrally with the flexible film 36.

  The flexible film 36 is attached to the second attachment member 14 by fixing the fixing member 38 to the caulking piece 30 provided at the upper end portion of the second attachment member 14. Thus, a fluid chamber 40 is formed between the main rubber elastic body 16 and the flexible film 36 so as to be fluid-tightly separated from the outside, and an incompressible fluid is enclosed. The incompressible fluid sealed in the fluid chamber 40 is not particularly limited. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is used. Furthermore, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is desirable in order to efficiently obtain a vibration isolation effect based on the fluid flow action described later.

  A partition member 42 is disposed in the fluid chamber 40. The partition member 42 has a substantially disk shape as a whole, and includes a partition member main body 44 and a lid member 46.

  The partition member main body 44 is a hard member formed of a metal such as hard synthetic resin or aluminum alloy, for example, and as shown in FIGS. . Further, in the central portion of the partition member main body 44, a substantially circular cutout recess 48 that opens upward is formed, and a substantially rounded rectangular housing recess 50 that opens downward is formed. Furthermore, a circumferential groove 52 extending in the circumferential direction while being opened on the lower surface is formed in the outer peripheral portion of the partition member main body 44 (see FIG. 4).

  On the other hand, as shown in FIGS. 1 and 5, the lid member 46 is a thin, substantially disk-shaped member made of a metal such as an aluminum alloy, and has a larger diameter than the partition member main body 44. . The lid member 46 is superimposed on the partition member main body 44 from below and fixed to each other. Thereby, the opening of the accommodation recess 50 formed in the partition member main body 44 is covered, and the accommodation space 54 is formed. In the present embodiment, a plurality of engagement pins protruding from the lower surface of the partition member main body 44 are inserted into a plurality of engagement holes formed through the lid member 46 so that the engagement pins are welded or caulked. The partition member main body 44 and the lid member 46 are fixed to each other by being locked around the engagement hole by the means.

  The partition member 42 having such a structure is accommodated in the fluid chamber 40. That is, the partition member 42 is disposed so as to expand in a direction substantially perpendicular to the axis within the fluid chamber 40, and the outer peripheral end portion of the lid member 46 is caulked and fixed by the connecting portion of the second mounting member 14 and the fixing member 38. As a result, the second mounting member 14 is supported. The outer peripheral surface of the partition member main body 44 is in fluid-tight contact with the fixing member 38 via the seal rubber layer 39.

  Due to the arrangement of the partition member 42, the fluid chamber 40 is vertically divided into two with the partition member 42 interposed therebetween. As a result, a part of the wall portion is constituted by the main rubber elastic body 16 below the partition member 42, and a pressure receiving chamber 58 is formed as a main liquid chamber in which an internal pressure fluctuation is caused when vibration is input. On the other hand, on the upper side of the partition member 42, a part of the wall portion is formed of the flexible film 36, and an equilibrium chamber 60 is formed as a secondary liquid chamber in which volume change is allowed. The pressure receiving chamber 58 and the equilibrium chamber 60 are filled with an incompressible fluid.

  The circumferential groove 52 formed in the partition member main body 44 has an opening on the lower surface covered with the lid member 46, and one end in the circumferential direction communicates with the pressure receiving chamber 58 through the first communication port 62. In addition, the other end portion in the circumferential direction is communicated with the equilibrium chamber 60 through the second communication port 64. Thus, an orifice passage 66 that connects the pressure receiving chamber 58 and the equilibrium chamber 60 to each other is formed by using the circumferential groove 52. The orifice passage 66 of the present embodiment is tuned to a low frequency of about 10 Hz corresponding to engine shake by adjusting the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L). Yes.

  A plurality of first opening windows 68 are formed in the central portion of the lid member 46 that constitutes a part of the wall portion of the accommodation space 54, and the other part of the wall portion of the accommodation space 54 is provided. A plurality of second opening windows 70 are formed in the central portion of the partition member main body 44 to be configured. Accordingly, the accommodation space 54 is communicated with the pressure receiving chamber 58 and the equilibrium chamber 60, and the fluid flow path 72 that communicates the pressure reception chamber 58 and the equilibrium chamber 60 with each other is formed between the accommodation space 54 and the first, The partition member 42 includes the second opening windows 68 and 70. In other words, the accommodation space 54 is formed on the fluid flow path 72 that allows the pressure receiving chamber 58 and the equilibrium chamber 60 to communicate with each other. In the present embodiment, the ratio of the passage cross-sectional area and the passage length of the fluid flow path 72 is larger than the ratio of the passage cross-sectional area and the passage length of the orifice passage 66.

  Further, a movable member 74 is disposed in the accommodation space 54 provided on the fluid flow path 72. As shown in FIGS. 1 and 6 to 8, the movable member 74 is formed of a rubber elastic body, and has a structure in which a pair of elastic plates 76 and 78 are connected to each other by a connection portion 80.

  More specifically, as shown in FIGS. 6 to 8, the first elastic plate 76 has a substantially rectangular flat plate shape that spreads in a substantially constant thickness dimension, and has a base end side in the length direction (a connection described later). Two first communication holes 82 penetrating in the thickness direction are formed side by side in the vicinity of the end of the portion 80 side.

  On the other hand, the second elastic plate 78 has a substantially rectangular plate shape like the first elastic plate 76, and is near the end on the tip side in the length direction (the side opposite to the connecting portion 80 described later). Two second communication holes 84 penetrating in the thickness direction are formed side by side. Although not clearly shown in the drawing, a large number of small protrusions (textures) are formed on the surfaces of the first and second elastic plates 76 and 78 and a connecting portion 80 described later, and are described later. In the arrangement state of the member 74 in the accommodation space 54, abnormal noise due to contact or friction with the inner surface of the wall of the accommodation space 54 is reduced.

  The first elastic plate 76 and the second elastic plate 78 are arranged to face each other and are connected to each other by a connection portion 80 provided on one side of the outer peripheral end portion. The connection portion 80 may be a hard member, but in the present embodiment, the connection portion 80 is formed of a rubber elastic body, and is integrally formed with the first elastic plate 76 and the second elastic plate 78, and the first It is thicker than the first and second elastic plates 76 and 78. Further, in the connection portion 80, the inner surfaces 86 connected to the opposing surfaces of the first elastic plate 76 and the second elastic plate 78 have a concave curved cross-sectional shape in the longitudinal section, and the first elastic plate 76. And the second elastic plate 78 are smoothly continuous without forming fold points or fold lines at the boundary portions. In addition, the outer surface located on the opposite side to the inner surface 86 in the connection portion 80 is a substantially flat surface extending in the axial direction, and the connection portion 80 is gradually thickened outward in the vertical direction. Further, the first and second elastic plates 76 and 78 are flat on both sides in the thickness direction including the opposing surfaces.

  As shown in FIG. 8, the first communication hole 82 of the first elastic plate 76 and the second communication hole 84 of the second elastic plate 78 are the first elastic plate 76 and the second elastic plate. Openings are formed at positions that do not overlap each other in the opposing direction of 78. In the movable member 74, the first communication hole 82 and the second communication hole 84 are arranged so as to be greatly separated in the length direction of the elastic plates 76 and 78.

  In the present embodiment, in the single state of the movable member 74 before being disposed in the accommodation space 54, the distance between the opposing surfaces gradually increases as the first elastic plate 76 and the second elastic plate 78 move away from the connection portion 80. They are inclined to each other so as to increase. However, such an inclination is not essential, and the first elastic plate 76 and the second elastic plate 78 may be arranged substantially parallel to each other in a single state, and the inclination angle is also provided when providing an inclination. However, the inclination angle with respect to the direction perpendicular to the axis may gradually increase as the distance from the connecting portion 80 increases.

  The movable member 74 having such a structure is disposed in the accommodation space 54 of the partition member 42. When the movable member 74 is disposed in the accommodation space 54, the connection portion 80 is vertically sandwiched between the inner surfaces of the upper and lower walls of the accommodation space 54, thereby the first elastic plate 76 and the second elastic plate. 78 is elastically supported by the partition member 42. Further, in the state in which the movable member 74 is disposed in the accommodation space 54, the first elastic plate 76 is in contact with and superimposed on the inner surface of the lower wall of the accommodation space 54, and the second elastic plate 78 is accommodated. The space 54 overlaps the inner surface of the upper wall of the space 54. Furthermore, as shown in FIGS. 9 to 11, the first elastic plate 76 and the second elastic plate 78 are moved to the distal end side by elastic deformation of the movable member 74 due to contact with the inner surfaces of the upper and lower walls of the accommodation space 54. The end portions (end portions on the remote side with respect to the connection portion 80) are brought close to each other and spread in substantially parallel. Even in the arrangement state in the accommodation space 54, the first communication hole 82 and the second communication hole 84 do not overlap each other in the facing direction of the first elastic plate 76 and the second elastic plate 78. Is open.

  Further, as shown in FIG. 1, in the state where the movable member 74 is disposed in the accommodation space 54, the first communication hole 82 of the first elastic plate 76 is formed in the first opening window 68 of the lid member 46. The second communication hole 84 of the second elastic plate 78 is aligned with the two of the second opening windows 70 of the partition member main body 44. Thereby, the fluid flow path 72 is comprised including the 1st communicating hole 82 and the 2nd communicating hole 84, and is provided in the communication state.

  The engine mount 10 having such a structure is attached to a power unit (not shown) and attached to the vehicle by attaching the second attachment member 14 to a vehicle body (not shown). When low-frequency large-amplitude vibration corresponding to engine shake or the like is input in the state of being mounted on the vehicle, fluid flow through the orifice passage 66 is positively generated in a resonance state, and fluid resonance action or the like. Based on the fluid action, the intended anti-vibration effect (high damping effect) is exhibited. On the other hand, when medium to high-frequency small-amplitude vibration such as idling vibration or traveling noise is input, the orifice passage 66 is substantially blocked by anti-resonance, and the pressure receiving chamber 58 and the equilibrium chamber 60 are connected through the fluid flow path 72. By allowing fluid flow between them, an increase in the dynamic spring constant is suppressed, and the intended vibration isolation effect (vibration insulation effect) is exhibited.

  Here, in the engine mount 10, as shown in FIG. 12, the communication and blocking of the fluid flow path 72 are switched by the movable member 74 in accordance with the amplitude of the input vibration.

  That is, when a positive pressure is applied to the pressure receiving chamber 58 by the input of the low frequency large amplitude vibration, the hydraulic pressure of the pressure receiving chamber 58 exerted on the lower surface of the first elastic plate 76 is exerted on the upper surface. The tip portion of the first elastic plate 76 is displaced upward by elastic deformation based on the hydraulic pressure difference. Then, as shown in FIG. 12 (a), the tip portion of the first elastic plate 76 is displaced relatively close to the second elastic plate 78, and the first and second elastic plates 76. , 78 are overlapped with each other on the inner wall surface of the upper side of the accommodation space 54, so that the second communication hole 84 is covered with the first elastic plate 76 and the fluid flow path 72 is blocked. It has become.

  Further, the second elastic plate 78 is held in contact with the inner surface of the upper wall of the accommodation space 54 by applying the positive pressure of the pressure receiving chamber 58 to the lower surface. Abnormal noise due to striking the first elastic plate 76 is reduced by utilizing a buffering action due to internal friction or the like.

  Further, when a negative pressure is exerted on the pressure receiving chamber 58 by the input of the low frequency large amplitude vibration, the hydraulic pressure of the pressure receiving chamber 58 exerted on the lower surface of the second elastic plate 78 is exerted on the upper surface. The tip portion of the second elastic plate 78 is displaced downward by elastic deformation based on the hydraulic pressure. Then, as shown in FIG. 12 (b), the tip end portion of the second elastic plate 78 is relatively displaced with respect to the first elastic plate 76, and the first and second elastic plates 76. , 78 are overlapped with each other on the inner wall surface of the lower side of the accommodation space 54 so that the second communication hole 84 is covered with the first elastic plate 76 so that the fluid flow path 72 is blocked. It has become.

  Further, the first elastic plate 76 is held in contact with the inner surface of the lower wall of the accommodation space 54 by the negative pressure of the pressure receiving chamber 58 exerted on the lower surface, and is buffered by the first elastic plate 76. The abnormal noise due to the impact of the second elastic plate 78 is reduced.

  As described above, in the engine mount 10, when the low frequency large amplitude vibration is input, the fluid flow path 72 is blocked by the movable member 74, and the amount of fluid flowing through the orifice passage 66 is efficiently secured. As a result, an anti-vibration effect based on the fluid flow action is effectively exhibited. In addition, one of the first elastic plate 76 and the second elastic plate 78 is elastically deformed to function as a valve body, and either one is held in contact with the inner wall surface of the housing space 54. By functioning as a buffer, the movable member 74 having a simple structure realizes reduction of sound hitting in addition to switching of the vibration isolation characteristics. Such a sound reduction effect is particularly effective when the engine is started or when the vehicle is shifted from the stopped state to the traveling state.

  Further, since the two elastic plates 76 and 78 are in contact with each other, internal friction due to elastic deformation of the elastic plates 76 and 78 and between the contact surfaces of the first and second elastic plates 76 and 78 are obtained. The impact energy at the time of contact of the first and second elastic plates 76 and 78 is efficiently reduced by the acting frictional resistance and the like. As a result, the buffering action is exhibited more advantageously, and the hitting sound at the time of contact is effectively reduced. In particular, in the present embodiment, the first and second elastic plates 76 and 78 are connected to each other by the connection portion 80 at the outer peripheral ends and are supported in a cantilever manner by the partition member 42. Since the second elastic plates 76 and 78 are gradually brought into contact with the connection portion 80 from the distal end side and the contact area is continuously increased, the impact force at the time of contact is reduced. The hitting sound is effectively reduced.

  Further, in the present embodiment, the first and second elastic plates 76 and 78 are preliminarily overlapped with the inner surfaces of the upper and lower walls of the accommodation space 54, so that the first and second elastic plates are in contact with each other when the hydraulic pressure is applied. The elastic plates 76 and 78 can be prevented from being hit from a position separated from the inner surfaces of the upper and lower walls of the housing space, and the occurrence of hitting sound can be prevented.

  On the other hand, when medium to high frequency small amplitude vibration is input, the first elastic plate 76 and the second elastic plate 78 do not undergo elastic deformation so as to overlap each other. All the holes 84 are held in communication. As a result, with respect to the input of medium to high frequency small amplitude vibration corresponding to idling vibration and traveling noise, the fluid flow path 72 is kept in communication and the low dynamic spring effect due to fluid flow through the fluid flow path 72 is achieved. Is effectively demonstrated.

  In addition, the movable member 74 of the present embodiment that switches the vibration isolation characteristics of the engine mount 10 is configured as one component by connecting the first and second elastic plates 76 and 78 by the connecting portion 80. . Therefore, the structure can be simplified and the arrangement work in the accommodation space 54 is facilitated.

  Furthermore, in the movable member 74 of the present embodiment, the first and second elastic plates 76 and 78 and the connection portion 80 are integrally formed of a rubber elastic body, so that the manufacturing process of the movable member 74 is reduced and the movable member 74 is movable. The member 74 can be easily formed, and the number of parts can be reduced. In addition, not only the first and second elastic plates 76 and 78 but also the connection portion 80 is formed of an elastic body, so that the connection portion 80 is also used when the hydraulic pressure is released, so that the first and second elasticity The plates 76 and 78 are quickly restored to the initial positions.

  Furthermore, the connecting portion 80 is thicker than the first and second elastic plates 76 and 78, and the displacement of the first and second elastic plates 76 and 78 due to the hydraulic pressure is made thinner. The first and second elastic plates 76 and 78 can be sufficiently generated by elastic deformation. On the other hand, when the elasticity of the connecting portion 80 is set to be sufficiently large, quick restoration of the first and second elastic plates 76 and 78 to the initial positions can be realized more advantageously when the hydraulic pressure is released.

  Furthermore, since the inner surface 86 of the connecting portion 80 has a curved cross-sectional shape that becomes concave toward the protruding side of the first and second elastic plates 76 and 78, the first and second elasticity due to the hydraulic pressure. When the plates 76 and 78 are displaced, the stress concentration on the inner surface 86 of the connecting portion 80 is alleviated, and durability is improved. In addition, in the state where the first and second elastic plates 76 and 78 are displaced and displaced by the hydraulic pressure, the elastic force on the inner surface 86 side of the connecting portion 80 separates the first and second elastic plates 76 and 78. Since it acts in the direction, the first and second elastic plates 76 and 78 are quickly displaced to the initial position by reducing or releasing the hydraulic pressure, and the fluid flow path 72 is quickly switched to the communication state.

  Further, in the movable member 74 of the present embodiment, the first and second elastic plates 76 and 78 are connected to each other by the connecting portion 80 provided on one side of the outer peripheral end portion. Since it is supported by the partition member 42, a large free length in the length direction of the first and second elastic plates 76 and 78 is secured. Therefore, the tip portions of the first and second elastic plates 76 and 78 are more easily displaced, and the shut-off state of the fluid flow path 72 due to the contact of the first and second elastic plates 76 and 78 is stabilized. Realized.

  In addition, since the second communication hole 84 is formed in the vicinity of the end portion (tip portion) on the opposite side of the connection portion 80 of the second elastic plate 78, the first and second elasticities that increase the displacement amount. The second communication hole 84 is stably blocked by the contact of the tip portions of the plates 76 and 78. In addition, the first communication hole 82 is formed in the vicinity of the end portion (base end portion) of the first elastic plate 76 on the connection portion 80 side, and is disposed far from the second communication hole 84. Therefore, the first and second communication holes 82 and 84 can be formed with a large degree of freedom in terms of the hole shape, size, number of formation, and the like.

  13 to 15 show a movable member 90 constituting a fluid-filled vibration isolator as a second embodiment having a structure according to the present invention. In the following description, members and parts that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals in the drawings and description thereof is omitted. Further, in each of the following embodiments, only a main part is illustrated, but a structure substantially similar to that of the first embodiment can be adopted for a part that is not illustrated.

  More specifically, the movable member 90 is formed of a rubber elastic body, and a central portion in the length direction (left and right direction in FIG. 14) of the pair of elastic plates 92 and 94 is connected to each other by the connecting portion 95. It is made the structure.

  The first elastic plate 92 has a substantially rectangular plate shape having a substantially constant thickness dimension, and gradually inclines from the central portion in the length direction toward both sides in the length direction. Further, first communication holes 96 penetrating in the thickness direction are formed at both ends of the first elastic plate 92 on both sides of the connection portion 95 in the width direction. Has been.

  The second elastic plate 94 has a substantially rectangular plate shape like the first elastic plate 92, and gradually inclines from the central portion in the length direction toward both sides in the length direction. Further, at the end of the second elastic plate 94 opposite to the connection portion 95, there are second communication holes 98 penetrating in the thickness direction on both sides sandwiching the connection portions 95 two by two in the width direction. Each is formed.

  As shown in FIG. 15, the first communication hole 96 of the first elastic plate 92 and the second communication hole 98 of the second elastic plate 94 are the first elastic plate 92 and the second elastic plate 94. In the present embodiment, the opening position of the first communication hole 96 and the opening position of the second communication hole 98 are in the length direction. They are set apart from each other.

  The first elastic plate 92 and the second elastic plate 94 are connected to each other at the central portion by a connection portion 95. The connecting portion 95 has a substantially constant cross-sectional shape and is continuous over the entire length of the first and second elastic plates 92 and 94 in the width direction (vertical direction in FIG. 15). The inner surfaces 86 and 86 that are continuous with the opposing surfaces of the plates 92 and 94 have concave curved cross-sectional shapes, respectively. In short, the movable member 90 has the first elastic plate 92 extending downwardly toward both sides in the length direction below the connecting portion 95 extending vertically, and the first elastic plate 92 extends above the connecting portion 95. The second elastic plate 94 extends upwardly toward both sides in the length direction, and is a rubber elastic body extending in the width direction with a substantially X-shaped cross section in a single state.

  Similarly to the movable member 74 of the first embodiment, the movable member 90 of the present embodiment also has the first elastic plate 92 and the second elastic plate 94 substantially parallel to each other when disposed in the accommodation space 54. To spread. Even in such an arrangement state, the first communication hole 96 and the second communication hole 98 are opened at positions that do not overlap each other in the opposing direction of the first and second elastic plates 92 and 94.

  Similar to the first embodiment, the movable member 90 having such a structure is disposed in the accommodation space 54 of the partition member 42, and the connection portion 95 is sandwiched between the inner surfaces of the upper and lower walls of the accommodation space 54. As a result, the first and second elastic plates 92 and 94 are supported by the partition member 42. Further, the first communication hole 96 is aligned with the first opening window 68 and the second communication hole 98 is aligned with the second opening window 70, whereby the first and second communication holes 96 are aligned. A fluid flow path 72 is configured including the holes 96 and 98. In the present embodiment, fluid flow paths 72 are formed on both sides in the length direction with the connecting portion 95 interposed therebetween.

  When a large amplitude vibration is input, the tip portion of one of the first elastic plate 92 and the second elastic plate 94 is displaced in the thickness direction, and the first elastic plate 92 and the second elastic plate 94 overlap each other on the inner surfaces of the upper and lower walls of the accommodation space 54, so that the second communication hole 98 is covered with the first elastic plate 92 and the fluid flow path 72 is blocked. Thereby, the vibration-proof effect by the orifice channel | path 66 can be acquired efficiently.

  On the other hand, when a small amplitude vibration is input, the displacement amounts of the tip portions of the first elastic plate 92 and the second elastic plate 94 are so small that they do not contact each other. , 98 are held in communication, and fluid flow through the fluid flow path 72 is allowed. Thereby, the remarkable increase in the dynamic spring constant due to the substantial sealing of the pressure receiving chamber 58 is avoided, and the vibration insulation effect can be obtained effectively.

  As described above, if the intermediate portions of the pair of elastic plates 92 and 94 are connected by the connecting portion 95, the free length of the pair of elastic plates 92 and 94 can be easily adjusted, and the pair of elastic plates 92 and 94 is thus formed. The ease of deformation can be set appropriately. Moreover, in the structure of the present embodiment, the connecting portion 95 extends continuously in the entire length in the width direction, and the fluid flow paths 72 are formed on both sides across the connecting portion 95. By making the flow path cross-sectional area and the flow path length of the path 72 different from each other, and making the ease of deformation of the pair of elastic plates 92 and 94 different on both sides of the connecting portion 95, vibration-proof characteristics It is also possible to adjust.

  FIG. 16 shows a main part of a fluid-filled vibration isolator as a third embodiment of the present invention. In the fluid filled type vibration isolator of the present embodiment, the movable member 100 is disposed in the accommodation space 54 of the partition member 42.

  The movable member 100 is formed of a rubber elastic body, and has a structure in which the first elastic plate 102 and the second elastic plate 104 are connected to each other by a pair of connecting portions 106 and 106, and the whole is substantially a band. It has a cylindrical shape.

  The first elastic plate 102 has a substantially rectangular flat plate shape, and first communication holes 108 penetrating in the thickness direction are provided at both end portions in the length direction (left-right direction in FIG. 16A). Is formed.

  The second elastic plate 104 has a substantially rectangular flat plate shape corresponding to the first elastic plate 102, and a second communication hole 110 penetrating in the thickness direction is formed at a central portion in the length direction. Yes. The second communication holes 110 have a smaller number of formations and a larger opening area than the first communication holes 108, and the total sum of the opening areas is preferably substantially the same as that of the first communication holes 108. It is said.

  In addition, the first elastic plate 102 and the second elastic plate 104 are connected to each other at both ends in the length direction by connecting portions 106. Each connecting portion 106 has the same structure as the connecting portion 80 of the first embodiment, and the inner surface 86 has a concave curved cross-sectional shape. Further, in the present embodiment, a pair of connection portions 106 and 106 are provided so as to face each other, and the first elastic plate 102 and the second elastic plate 104 are connected to each other at both ends in the length direction. By being connected to each other at 106, the movable member 100 in the form of a strip-shaped cylinder is configured as a whole. The connecting portions 106 and 106 may be separated from the first and second elastic plates 102 and 104, but in the present embodiment, they are integrated with the first and second elastic plates 102 and 104. The entire movable member 100 is formed of a rubber elastic body.

  The movable member 100 is accommodated in the accommodating space 54 of the partition member 42, and the pair of connection portions 106 and 106 are respectively sandwiched between the inner surfaces of the upper and lower walls of the accommodating space 54, thereby The second elastic plates 102 and 104 are supported by the partition member 42 at both ends in the length direction. Further, the first communication hole 108 is aligned with the first opening window 68 of the lid member 46, and the second communication hole 110 is aligned with the second opening window 70 of the partition member main body 44. Aligned. In the partition member 42, the arrangement, shape, size, and the like of the second opening window 70 are changed according to the opening position, shape, size, and the like of the second communication hole 110.

  In such a state where the partition member is mounted, when a large amplitude vibration is input, one of the first and second elastic plates 102 and 104 has a central portion in the longitudinal direction relative to the pressure receiving chamber 58 and the equilibrium chamber 60. Displacement in the thickness direction due to a typical fluid pressure fluctuation makes contact with one of the first and second elastic plates 102 and 104. As a result, as shown in FIGS. 16A and 16B, the second communication hole 110 formed in the central portion in the length direction is covered and blocked by the first elastic plate 102. The fluid flow path 72 is blocked, and the vibration isolation effect based on the fluid flow action in the orifice passage 66 is effectively exhibited.

  On the other hand, at the time of inputting a small amplitude vibration, as shown in FIG. 16C, the central portions in the length direction of the first and second elastic plates 102 and 104 do not come into contact with each other. The second communication holes 108 and 110 are both held in communication, and the fluid flow path 72 is held in communication. Therefore, even if the orifice passage 66 is substantially blocked by anti-resonance, the high dynamic spring caused by the sealing of the pressure receiving chamber 58 is avoided, and the intended vibration isolation effect can be obtained.

  Further, according to the structure of the present embodiment, the first and second elastic plates 102 and 104 are connected by the connecting portions 106 and 106 at both end portions in the length direction, so that the structure of the first embodiment is achieved. In comparison, the impact when the first and second elastic plates 102 and 104 are in contact with each other can be reduced by the elasticity of the movable member 100 itself, and the hitting sound can be more effectively reduced.

  FIG. 17 shows a main part of a fluid-filled vibration isolator as a fourth embodiment of the present invention. That is, the fluid-filled vibration isolator has a structure in which the movable member 124 is accommodated in the accommodation space 122 of the partition member 120.

  The partition member 120 includes a partition member main body 126 and a lid member 46, and the partition member main body 126 has a structure in which a first divided body 128 and a second divided body 130 are vertically stacked and fixed. In short, the partition member 120 of the present embodiment is configured by overlapping three members in the axial direction and fixing them together.

  The first divided body 128 has a substantially annular plate shape as a whole, and a sandwiching protrusion 131 that protrudes toward the inner peripheral side in the central portion in the axial direction is continuously provided over the entire periphery on the inner peripheral surface. Is provided. Although not shown in the drawing, the outer peripheral portion of the first divided body 128 is thicker in the axial direction than the inner peripheral portion, and the peripheral groove 52 is formed.

  The 2nd division body 130 is made into the substantially disc shape as a whole, and is overlaid from the upper part on the inner peripheral part of the 1st division body 128 made thin. In the present embodiment, the first and second divided bodies 128 and 130 are both made of synthetic resin, and the first and second divided bodies 128 and 130 are fixed to each other by welding. However, the first and second divided bodies 128 and 130 may be formed of metal or the like, and are fixed by engagement of pins and holes, like the lid member 46 and the partition member main body 44 of the first embodiment. Can be done.

  By attaching the lid member 46 to the partition member main body 126 having such a structure, the partition member 120 of the present embodiment is formed. Further, the central hole of the first divided body 128 is covered with the second divided body 130 and the lid member 46 from both sides in the axial direction, so that the accommodation space 122 is formed inside the partition member 120. The accommodation space 122 communicates with the pressure receiving chamber 58 through a first opening window 68 formed in the lid member 46 and is also in an equilibrium chamber through a second opening window 70 formed in the second divided body 130. The pressure receiving chamber 58 and the equilibrium chamber 60 are provided on a fluid flow path 72 that communicates with each other.

  A movable member 124 is disposed in the accommodation space 122. The movable member 124 includes a first elastic plate 132 and a second elastic plate 134 that are formed independently of each other. The first elastic plate 132 has a substantially flat plate shape, and first communication holes 136 penetrating in the thickness direction are respectively formed at two positions separated in the length direction (left-right direction in FIG. 17). ing. On the other hand, the second elastic plate 134 has a flat plate shape substantially corresponding to the first elastic plate 132, and a second communication hole 138 penetrating in the thickness direction is formed in a central portion in the length direction. ing.

  And the 1st elastic board 132 and the 2nd elastic board 134 are arrange | positioned in the accommodation space 122, are supported by the partition member 120, and are arrange | positioned facing each other in the up-down direction. That is, the outer peripheral end of the first elastic plate 132 is overlapped with the sandwiching protrusion 131 of the first divided body 128 from below, and is sandwiched between the first divided body 128 and the lid member 46. Yes. On the other hand, the outer peripheral end of the second elastic plate 134 is overlapped with the sandwiching protrusion 131 of the first divided body 128 from above, and the second elastic plate 134 is between the first divided body 128 and the second divided body 130. It is pinched. As a result, the first and second elastic plates 132 and 134 are supported by the partition member 120 over the entire outer peripheral end in a state where the elastic deformation of the inner peripheral portion is allowed.

  Also in the fluid-filled vibration isolator including the partition member 120 and the movable member 124 having the structure according to the present embodiment, high attenuation by the orifice passage 66 that is exhibited when large amplitude vibration is input, as in the above embodiments. Both the effect and the low dynamic spring effect by the fluid flow path 72 that is exhibited when the small amplitude vibration is input can be effectively obtained. Further, the hitting sound generated when the first and second elastic plates 132 and 134 come into contact with each other is reduced based on the buffering action of the first and second elastic plates 132 and 134. In FIG. 17, the second elastic plate 134 in a state in which a negative pressure is applied to the pressure receiving chamber 58 by the input of the large amplitude vibration and is moved closer to the first elastic plate 132 side is indicated by a two-dot chain line. Has been.

  As is clear from the structure of the present embodiment, the pair of elastic plates constituting the movable member do not necessarily have to be connected to each other by the connection portion, and are provided independently of each other, and are respectively provided by the partition members. It may be supported.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the movable member may be formed of a material other than rubber that exhibits rubber-like elasticity, such as a polymer elastomer.

  Further, the movable member may not be entirely formed of a single material. For example, a set of elastic plates may be formed of different materials. In addition, for example, the connection portion may be a separate member formed of metal, synthetic resin, or the like, and a set of elastic plates may be fixed to the connection portion afterward. Further, for example, in the structure of the first embodiment, a restraint plate that is harder to deform than the second elastic plate 78 is fixed in an embedded state around the second communication hole 84 in the second elastic plate 78. Thus, the second communication hole 84 and its surrounding shape are stabilized, and the second communication hole 84 is covered more stably by the contact of the first and second elastic plates 76 and 78. it can.

  Further, the set of elastic plates is not limited to a rectangular plate shape, and may be, for example, a disc shape. Further, the pair of elastic plates may be different in shape, size forming material, and the like. Furthermore, the communication holes formed in the pair of elastic plates are not necessarily limited to the hole shape penetrating the intermediate portion of the elastic plate. For example, notched communication holes penetrating the outer peripheral end of the elastic plate are also included. Can be employed. Furthermore, in the above-described embodiment, the structure in which only one of the communication holes is covered and blocked is illustrated. The two communicating holes may be blocked by forming a pair of elastic plates so as to overlap each other.

  Furthermore, the structure of the connection portion that connects the pair of elastic plates to each other is not particularly limited. For example, the connection portion need not be provided continuously over the entire length in the width direction of the pair of elastic plates. It may be provided partially in the middle portion in the width direction, or a plurality of connection portions may be provided intermittently in the width direction.

  Further, the support structure by the partition member of the pair of elastic plates is not limited to the structure of the above embodiment, and for example, the engagement pin is protruded from the inner surface of the upper and lower walls of the housing space. The set of elastic plates can also be supported by the partition member by inserting and locking the locking pins into locking holes formed in the set of elastic plates.

  In the above embodiment, a fluid-filled vibration isolator having a structure in which the power unit is supported in an anti-vibration state in a suspended state with respect to the vehicle body is exemplified, but the present invention is disposed below the power unit, for example, The fluid-filled vibration isolator that supports the power unit from below, the first mounting member and the second mounting member each have a cylindrical shape, and the first and second mounting members that are arranged inside and outside are elastic on the main body. The present invention is also applicable to a cylindrical fluid-filled vibration isolator having a structure elastically connected by a body.

  The present invention is not only applied to engine mounts, but can be suitably applied to various types of vibration isolators including body mounts and member mounts. Further, the scope of application of the present invention is not limited to a vibration isolator for automobiles, and can be applied to a vibration isolator used for other than automobiles such as motorcycles, railway vehicles, and industrial vehicles.

10: engine mount (fluid-filled vibration isolator), 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 42: partition member, 54, 122: accommodation space, 58 : Pressure receiving chamber (main liquid chamber), 60: equilibrium chamber (sub liquid chamber), 66: orifice passage, 72: fluid flow path, 74, 90, 100, 124: movable member, 76, 92, 102, 132: first One elastic plate (one elastic plate), 78, 94, 104, 134: second elastic plate (the other elastic plate), 80, 95, 106: connection portion, 82, 96, 108, 136: first Communication hole, 84, 98, 110, 138: second communication hole, 86: inner surface (surface of the connecting portion connected to the opposing surface of a set of elastic plates)

Claims (11)

The first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed on both sides of the partition member supported by the second mounting member. The incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and the orifice passage that connects the main liquid chamber and the sub liquid chamber to each other is formed.
The partition member is formed with a fluid flow path that allows the main liquid chamber and the sub liquid chamber to communicate with each other, and a fluid-filled type in which a movable member is disposed in an accommodation space provided on the fluid flow path In the vibration isolator,
The movable member is supported by the partition member and includes a pair of elastic plates that are spaced apart from each other, and each of the set of elastic plates has a communication hole,
The communication holes are opened at positions where they do not overlap each other in the opposing direction of the pair of elastic plates, and the pair of elastic plates are displaced relative to each other by the hydraulic pressure, and are mutually on the inner surface of the housing space. While overlapping, at least one of the communication holes is covered and the fluid flow path is blocked ,
The movable member includes a connection portion for connecting the pair of elastic plates to each other;
The outer peripheral ends of the set of the elastic plates are connected to each other by the connection part,
The communication hole formed in one of the elastic plates is positioned on the connecting portion side of one of the elastic plates, and the communication hole formed in the other elastic plate of the other elastic plate A fluid-filled vibration isolator, which is located on the side opposite to the connection portion . The first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed on both sides of the partition member supported by the second mounting member. The incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and the orifice passage that connects the main liquid chamber and the sub liquid chamber to each other is formed.
The partition member is formed with a fluid flow path that allows the main liquid chamber and the sub liquid chamber to communicate with each other, and a fluid-filled type in which a movable member is disposed in an accommodation space provided on the fluid flow path In the vibration isolator,
The movable member is supported by the partition member and includes a pair of elastic plates that are spaced apart from each other, and each of the set of elastic plates has a communication hole,
The communication holes are opened at positions where they do not overlap each other in the opposing direction of the pair of elastic plates, and the pair of elastic plates are displaced relative to each other by the hydraulic pressure, and are mutually on the inner surface of the housing space. While overlapping, at least one of the communication holes is covered and the fluid flow path is blocked,
The movable member includes a connection portion for connecting the pair of elastic plates to each other;
A middle portion of the set of elastic plates is connected to each other by the connecting portion;
The communication hole formed in one of the elastic plates is positioned on the connecting portion side of one of the elastic plates, and the communication hole formed in the other elastic plate of the other elastic plate A fluid-filled vibration isolator, which is located on the side opposite to the connection portion. In the movable member, the distance between the opposing surfaces of the pair of elastic plates increases as the distance from the connection portion increases, and the pair of elastic plates is arranged by disposing the movable member with respect to the accommodation space of the partition member. The end of the pair of elastic plates positioned on the remote side with respect to the connecting portion is pressed against the inner surface of the opposing wall of the housing space so that the ends of the elastic plate are brought close to each other. The fluid-filled vibration isolator as described . The first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed on both sides of the partition member supported by the second mounting member. The incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and the orifice passage that connects the main liquid chamber and the sub liquid chamber to each other is formed.
The partition member is formed with a fluid flow path that allows the main liquid chamber and the sub liquid chamber to communicate with each other, and a fluid-filled type in which a movable member is disposed in an accommodation space provided on the fluid flow path In the vibration isolator,
The movable member is supported by the partition member and includes a pair of elastic plates that are spaced apart from each other, and each of the set of elastic plates has a communication hole,
The communication holes are opened at positions where they do not overlap each other in the opposing direction of the pair of elastic plates, and the pair of elastic plates are displaced relative to each other by the hydraulic pressure, and are mutually on the inner surface of the housing space. While overlapping, at least one of the communication holes is covered and the fluid flow path is blocked,
The movable member includes a connection portion for connecting the pair of elastic plates to each other;
In the movable member, the distance between the opposing surfaces of the pair of elastic plates increases as the distance from the connection portion increases, and the pair of elastic plates is arranged by disposing the movable member with respect to the accommodation space of the partition member. fluid but characterized in that the ends of a pair of elastic plates located remotely side with respect to the connecting portion is pressed against the interior wall surface opposite of said housing space is to be brought closer to each other Enclosed vibration isolator. The fluid-filled vibration isolator according to claim 4 , wherein outer peripheral end portions of the pair of elastic plates are connected to each other by the connection portion. The fluid filled type vibration damping device according to claim 4 , wherein intermediate portions of the pair of elastic plates are connected to each other by the connecting portion. The fluid-filled vibration isolator according to any one of claims 1 to 6 , wherein the pair of elastic plates are in contact with and overlapped with the opposing inner wall surfaces of the accommodation space. The fluid-filled vibration isolator according to any one of claims 1 to 7 , wherein the set of the elastic plate and the connection portion are integrally formed of a rubber elastic body. The fluid filled type vibration damping device according to claim 8 , wherein the connection portion is thicker than the pair of elastic plates. The fluid-filled vibration isolator according to claim 8 or 9 , wherein a surface of the connection portion connected to the opposing surfaces of the pair of elastic plates has a concave curved cross-sectional shape. The fluid-filled vibration isolator according to any one of claims 1 to 10 , wherein the connection portion is sandwiched by the partition member in a direction opposite to the pair of elastic plates.

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