JP2008163974A - Fluid filled vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid filled vibration control device having simple, compact and inexpensive construction for improved vibration control effects in each of two different frequency ranges. <P>SOLUTION: A valve element 106 formed of a ferromagnetic material is arranged on an opening portion of a second orifice passage 96. A coil spring 112 is mounted between a partition member 42 and the valve element 106, and the valve element 106 is located outward apart from the opening portion of the second orifice passage 96 in the initial condition of the coil spring 112 to hold the second orifice passage 96 in a communicated condition. On the other hand, a coil 114 is incorporated in the partition member 42 to form a valve means including the valve element 106, the coil spring 112 and the coil 114. The coil 114 is energized to suction displace the valve element 106, whereby the second orifice passage 96 is shut off. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid-filled vibration isolator that obtains a vibration-proof effect based on the flow action of an incompressible fluid sealed inside, for example, a fluid suitably employed as an engine mount for an automobile, for example. The present invention relates to a sealed vibration isolator.

  Conventionally, an anti-vibration device in which a first attachment member and a second attachment member are connected by a main rubber elastic body as an anti-vibration coupling body or an anti-vibration support body interposed between members constituting a vibration transmission system. Has been adopted in various fields. As a kind of such a vibration isolator, a first attachment member attached to one member constituting the vibration transmission system and a second attachment member attached to the other member constituting the vibration transmission system are provided as main rubber. A partition member that is elastically connected by the elastic body and supported by the second mounting member is provided, and a part of the wall portion is configured by the main rubber elastic body on one side across the partition member. A pressure receiving chamber is formed in which pressure fluctuation is generated when vibration is input between the mounting member and the second mounting member, and a part of the wall portion is formed of a flexible film on the other side across the partition member Thus, a fluid-filled vibration isolator has been proposed in which an equilibrium chamber in which volume change is allowed is formed, and an orifice passage that connects the pressure receiving chamber and the equilibrium chamber to each other is provided.

  In such a fluid-filled vibration isolator, an excellent vibration-proof effect based on a fluid action such as a resonance action of an incompressible fluid sealed in the tuning frequency range of the orifice passage is exhibited, for example, Application to automobile engine mounts, body mounts, and the like that require high vibration isolation performance in a specific frequency range has been studied.

  Further, in order to obtain such an excellent anti-vibration effect in a plurality of frequency ranges, as described in Patent Document 1 (Japanese Patent Laid-Open No. 10-89402) and the like, a plurality of frequencies tuned to different frequency ranges are used. A fluid-filled vibration isolator having a structure having an orifice passage has also been proposed. That is, the first and second orifice passages tuned to different frequency ranges are provided, and the second orifice passage tuned to a higher frequency range than the first orifice passage is switched between the communication state and the cutoff state. By providing this, the vibration isolation effect based on the fluid flow action is effectively exhibited in any tuning frequency range of the first orifice passage and the second orifice passage.

  In such a fluid-filled vibration isolator described in Patent Document 1, the valve element that switches the second orifice passage between the communication state and the shut-off state is provided by an opening on the equilibrium chamber side of the second orifice passage by a coil spring. And is movable in a direction away from the opening on the equilibrium chamber side of the second orifice passage by the driving force exerted on the valve body by the pneumatic actuator.

  However, when a pneumatic actuator is employed as a driving means for opening and closing the valve body as in the fluid-filled vibration isolator described in Patent Document 1, a pneumatic actuator is provided on one axial side of the vibration isolator body. By being arranged, there is a problem that the entire vibration isolator is easily increased in size in the axial direction.

  Therefore, in order to reduce the size in the axial direction, the electromagnetic force generated by energizing the coil is used as in the fluid filled type vibration isolator described in Patent Document 2 (Japanese Patent Laid-Open No. 2002-81490). Attempts have also been made to open and close the valve body using an electromagnetic actuator. As such a fluid-filled vibration isolator, for example, there is one described in Patent Document 2. That is, a coil member having a coil is disposed on the outer peripheral surface of the second mounting member, and a valve body formed of a magnet is provided on the central axis of the coil. By displacing on the extension line of the shaft, the second orifice passage tuned to the high frequency side can be switched between the communication state and the cutoff state.

  However, when an electromagnetic actuator is employed in a fluid-filled vibration isolator with a fluid enclosed therein, in order to avoid problems such as leakage during energization of the coil, the coil is I had to install it outside. Therefore, a sufficient miniaturization of the fluid-filled vibration isolator has not yet been realized.

JP-A-10-89402 JP 2002-81490 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is a fluid-filled type that exhibits an excellent anti-vibration effect in any of two different frequency ranges. An object of the present invention is to realize a vibration isolator with a simple structure in a compact and inexpensive manner.

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

  In addition, the present invention connects the first attachment member attached to one member to be vibration-proof connected to the second attachment member attached to the other member to be vibration-proof connected by the main rubber elastic body. A pressure receiving chamber in which a part of the wall part is constituted by the main rubber elastic body and a part of the wall part are constituted by a flexible membrane on both sides of the partition member supported by the second mounting member. A first orifice passage and a second orifice passage tuned in a higher frequency range than the first orifice passage, respectively, which form a balanced chamber and communicate the pressure receiving chamber and the balance chamber with each other. In addition, in the fluid filled type vibration damping device, provided with valve means that can be operated by energization from the outside, the second orifice passage can be switched between the communication state and the cutoff state by the valve means. Using formed valve body The valve body is disposed on the opening of the second orifice passage, and a coil spring is interposed between the partition member and the valve body so that the valve body is in an initial state of the coil spring. The second orifice passage is held in a communicating state by being positioned outwardly from the opening of the second orifice passage, while a coil is incorporated inside the partition member, and the valve body and the coil spring The valve means is configured to include the coil, and the second orifice passage is blocked by displacing the valve body by energizing the coil.

  In such a fluid-filled vibration isolator having a structure according to the present invention, a valve body formed of a ferromagnetic material is employed, and the valve body is energized by a coil spring, thereby energizing the coil. By controlling, the valve body can be displaced and opened and closed. As a result, the state of energization of the coil is controlled according to the frequency of the input vibration, etc., so that the communication state and the cutoff state of the second orifice passage are switched, and both are excellent against vibrations in two different frequency ranges Anti-vibration effect can be demonstrated.

  Further, by incorporating the coil into the partition member, an electromagnetic switching means (a valve means including a coil and a valve body) can be incorporated in the fluid filled type vibration isolator, and the electromagnetic switching means is provided. A fluid-filled vibration isolator can be realized in a compact manner. In addition, by arranging the coil inside the partition member, the coil is arranged separately from the region (pressure receiving chamber or equilibrium chamber) in which the incompressible fluid is sealed. Therefore, it is possible to easily avoid the occurrence of problems such as leakage during energization of the coil due to the coil coming into contact with the sealed fluid.

  In the fluid-filled vibration isolator according to the present invention, the partition member may be a molded product, and the coil may be embedded in the partition member when the partition member is molded.

  In this way, by setting the coil in the mold in advance when the partition member is molded, the coil is embedded in the partition member, so that the region where the coil is provided inside the partition member can be set as a pressure receiving chamber or an equilibrium chamber. Can be easily sealed. Therefore, it is possible to more advantageously avoid the problem that the coil is in contact with the sealed fluid and leaks when energized.

  Further, in the fluid filled type vibration damping device according to the present invention, a seal rubber is interposed between the partition member and the valve means, and when the coil is energized, the valve means passes through the seal rubber to the second orifice. It is also possible to adopt a structure in which the second orifice passage is blocked by being in close contact with the opening of the passage.

  By adopting such a structure, when energizing the coil, the valve body formed of a ferromagnetic material and the partition member in which the coil is incorporated can be brought into close contact with each other through a seal rubber, and the first The closed state of the two orifice passages can be realized more advantageously. Therefore, when the vibration input of the frequency range in which the first orifice passage is tuned is input, the internal pressure of the pressure receiving chamber is prevented from being released by the fluid flow through the second orifice passage, and the fluid flow through the first orifice passage is prevented. The amount can be advantageously obtained, and the desired anti-vibration effect can be exhibited effectively.

  In addition, by causing the valve body and the partition member to abut against each other through a seal rubber, the impact generated when the valve body and the partition member are in contact can be reduced, and abnormal noise and vibration generated at the time of contact are reduced. Can be reduced or avoided.

  Further, in the fluid filled type vibration damping device according to the present invention, a part of the partition member is exposed to the outside, and a part of the partition member is exposed to the outside to connect the coil member to the power supply device. A structure taken out from the outside may be adopted.

  According to this, the coil assembled inside the partition member and the power supply device provided outside the fluid-filled vibration isolator can be connected by the lead wire provided so as to extend inside the partition member. Is possible. Thereby, it can avoid that a lead wire contacts the incompressible fluid with which it was enclosed, and it can prevent advantageously that it leaks from a lead wire at the time of electricity supply.

  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, FIGS. 1 and 2 show an automobile engine mount 10 as a first embodiment of a fluid filled type vibration damping device according to the present invention. The engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are elastically connected by a main rubber elastic body 16. Yes. The first mounting bracket 12 is attached to a vehicle power unit (not shown), and the second mounting bracket 14 is attached to a vehicle body (not shown). Accordingly, the power unit is elastically supported via the engine mount 10 with respect to the vehicle body. In the following description, the vertical direction means the vertical direction in FIG. 1, which is the main load input direction, unless otherwise specified. 1 and 2 show the engine mount 10 in a non-mounted state on the vehicle.

  More specifically, the first mounting member 12 is made of a metal material such as iron or aluminum alloy, and has a substantially circular block shape as a whole. The first mounting bracket 12 also includes a substantially hemispherical fixing portion 18 that protrudes downward in the axial direction. Further, a stopper portion 20 is integrally formed at the upper end of the fixing portion 18 and extends outward in the direction perpendicular to the axis over the entire circumference. Furthermore, a substantially cylindrical threaded portion 22 extending in the axial direction is integrally formed above the stopper portion 20. A bolt hole 24 extending on the central axis is formed in the screw portion 22, and a fixing bolt (not shown) is screwed into the bolt hole 24, so that the first mounting bracket 12 is connected to the power unit side (not shown). It is designed to be fixedly attached to the member.

  The second mounting bracket 14 has a thin cylindrical shape with a large diameter as a whole, and is formed of a rigid material made of iron, aluminum alloy, or the like. In addition, the second mounting bracket 14 is formed as a cylindrical portion 26 having a substantially constant diameter in the axial direction on the lower side of a part in the middle in the axial direction, and the shaft on the upper side of the part in the middle in the axial direction. The taper portion 28 gradually increases in diameter as it goes upward in the direction. Further, a flange portion 30 that extends outward in the direction perpendicular to the axis is integrally formed at the upper end of the tapered portion 28. Further, an annular first locking projection 32 that extends radially inward is integrally formed continuously at the lower end in the axial direction of the second mounting bracket 14 over the entire circumference. Further, for example, a bracket (not shown) is externally fixed to the second mounting bracket 14. Then, the bracket is fixedly attached to a vehicle body side member (not shown), so that the second mounting bracket 14 is fixedly attached to the vehicle body.

  The first mounting bracket 12 and the second mounting bracket 14 are arranged on the same central axis, and the first mounting bracket 12 is located with respect to the upper opening of the second mounting bracket 14. And spaced apart upward in the axial direction. A main rubber elastic body 16 is interposed between the first mounting bracket 12 and the second mounting bracket 14. The main rubber elastic body 16 is a thick rubber elastic body having a substantially frustoconical shape as a whole, and a circular recess 34 that opens downward in the axial direction is formed at the center of the lower end thereof.

  Then, vulcanized and bonded so that the fixing portion 18 of the first mounting bracket 12 is embedded in the upper end of the main rubber elastic body 16 in the axial direction, and the radial center portion of the stopper portion 20 is main rubber elastic. The first mounting member 12 is vulcanized and bonded to the central portion in the direction perpendicular to the axis of the main rubber elastic body 16 by being vulcanized and bonded to the upper end surface of the body 16 from above in the axial direction. On the other hand, the taper portion 28 of the second mounting bracket 14 is superimposed on the outer peripheral surface of the lower end portion in the axial direction of the main rubber elastic body 16 and is vulcanized and bonded, so that the second mounting bracket 14 is attached to the main body. The rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface in the direction perpendicular to the axis. Thus, in this embodiment, the main rubber elastic body 16 is formed as an integrally vulcanized molded product 36 that integrally includes the first mounting bracket 12 and the second mounting bracket 14.

  A stopper rubber 38 is integrally formed on the upper end of the main rubber elastic body 16 in the axial direction. The stopper rubber 38 is formed so as to cover substantially the entire outer peripheral portion of the stopper portion 20 of the first mounting bracket 12 and protrudes at a predetermined height from the upper surface of the stopper portion 20 in the axial direction. I'm hurt.

  A seal rubber layer 40 is integrally formed at the lower end in the axial direction of the main rubber elastic body 16. The seal rubber layer 40 is a thin rubber layer having a substantially cylindrical shape, and is formed so as to extend downward in the axial direction from the outer peripheral wall portion of the circular recess 34. The inner peripheral surface of the shaped portion 26 is vulcanized and bonded so as to cover almost the entire surface. Thereby, the inner surface of the taper part 28 and the cylindrical part 26 is covered with the main body rubber elastic body 16 and the seal rubber layer 40 over the whole surface of the second mounting bracket 14. The seal rubber layer 40 is thinner than the outer peripheral edge at the lower end of the main rubber elastic body 16, and a step is formed at the boundary between the main rubber elastic body 16 and the seal rubber layer 40.

  Further, a partition member 42 is assembled to the opening portion on the lower side in the axial direction of the second mounting bracket 14 and supported by the second mounting bracket 14. The partition member 42 is formed of a rigid material such as a hard synthetic resin material, and has a substantially circular block shape as a whole. Further, the partition member 42 in the present embodiment is configured such that a thin disk-shaped lid member 46 is superimposed on the upper end surface of the partition member main body 44. The partition member 42 is preferably formed of a material that is not magnetized.

  The partition member main body 44 has a substantially circular block shape, and is formed of a hard synthetic resin material in the present embodiment. The partition member main body 44 is formed with first and second locking grooves 48 and 50 that open to the outer peripheral surface and extend continuously in the circumferential direction. The first locking groove 48 is formed at a predetermined distance above the second locking groove 50 in the axial direction.

  Further, a central recess 52 is formed at the lower end portion in the axial direction of the partition member main body 44 and is formed in the central portion in the radial direction and opens downward in the axial direction.

  In addition, an accommodation recess 54 that opens downward in the axial direction is formed in a central portion in the radial direction of the bottom surface of the central recess 52. The housing recess 54 is a recess having a substantially constant circular cross section, and is opened downward in the axial direction.

  Further, a buffer rubber 56 as a seal rubber is fixed to the upper bottom wall surface of the housing recess 54. The buffer rubber 56 is formed of an annular rubber elastic body having a substantially constant cross-sectional shape and continuously extending in the circumferential direction, and is fixed to the radial intermediate portion of the upper bottom wall surface of the housing recess 54 to be axially downward. It is made to protrude toward. Further, the shock absorbing rubber 56 has a substantially semicircular cross section at the lower end portion, and has a cross sectional shape that becomes narrower in the axially downward direction on the protruding tip side. The buffer rubber 56 may be vulcanized and bonded to the partition member main body 44, or may be fixed by means such as adhesion or locking.

  Further, an annular step 58 is formed at the boundary between the central recess 52 and the housing recess 54, and a locking projection 60 that protrudes downward in the axial direction is provided on the step 58. The partition member main body 44 is integrally formed. The locking projection 60 includes a shaft portion that extends linearly downward in the axial direction and a locking portion that extends outward in the direction perpendicular to the axis at the lower end portion of the shaft portion, and has a generally umbrella shape that is opposite in direction. ing. In the present embodiment, a plurality of locking projections 60 are formed at a predetermined distance from each other in the circumferential direction.

  In addition, a cutout portion 62 that continuously extends over a predetermined length in the circumferential direction is formed in the outer peripheral edge portion of the upper end portion of the partition member main body 44. In addition, a lower peripheral groove 64 is formed in the lower end portion of the partition member main body 44 located on the outer peripheral side of the central recess 52 and opens to the outer peripheral surface and continuously extends over a predetermined length in the circumferential direction. ing. In the present embodiment, the notch 62 is formed in a portion of the partition member main body 44 that is positioned on the axially upper side of the first locking groove 48, and the lower peripheral groove 64 is the partition member main body 44. Is formed in a portion located on the lower side in the axial direction than the second locking groove 50.

  In addition, the end on one side in the circumferential direction of the notch 62 and the end on the other side in the circumferential direction of the lower circumferential groove 64 are aligned with each other in the circumferential direction so that they overlap in the projection in the axial direction. It is located in. Further, a not-shown through-hole extending linearly in the axial direction is provided between the axial ends of one end in the circumferential direction of the notch 62 and the other end in the circumferential direction of the lower circumferential groove 64 that are aligned with each other. Is formed. One end of the through hole is opened on the lower surface of the circumferential end of the notch 62, and the other end is opened on the upper surface of the circumferential end of the lower circumferential groove 64. ing.

  In addition, a through hole 66 extending in the axial direction is formed in the radial center portion of the partition member main body 44. The through holes 66 are linearly formed so as to extend on the central axis of the partition member main body 44, and are formed so as to open to both end surfaces in the axial direction of the partition member main body 44. As is clear from FIG. 1, the through-hole 66 in the present embodiment has one opening in the axial direction formed in the upper end surface of the partition member main body 44 and the other opening in the housing recess. An opening is formed in the upper bottom wall surface of 54.

  A lid member 46 is superimposed on the partition member main body 44 from above in the axial direction. The lid member 46 has a thin and substantially disk shape, and is formed of, for example, a hard synthetic resin material. In addition, a communication window 68 penetrating in the plate thickness direction is formed in the central portion of the lid member 46 in the radial direction. Furthermore, in the present embodiment, the outer peripheral portion of the lid member 46 is thicker than the center portion, and the lower surface of the lid member 46 has a stepped shape. In the present embodiment, the lid member 46 is formed of a material that is not magnetized, like the partition member main body 44.

  And the partition member 42 in this embodiment is comprised by the cover member 46 being piled up and assembled | attached on the upper surface of the partition member main body 44. As shown in FIG. In particular, in the present embodiment, the radially central portion of the partition member main body 44 has a convex shape positioned axially above the outer peripheral portion (upward in FIG. 1), and the radial center of the lid member 46. The portion is a concave shape that opens downward, and the convex portion at the upper end of the central portion in the radial direction of the partition member main body 44 is fitted into the concave portion at the lower end of the central portion in the radial direction of the lid member 46. The partition member main body 44 and the lid member 46 are positioned relative to each other in the direction perpendicular to the axis.

  Further, the lid member 46 is overlaid on the upper surface of the partition member main body 44, so that the axially upward opening of the notch 62 is covered by the lid member 46, and the partition member 42 is utilized using the notch 62. An upper circumferential groove 70 is formed in the outer circumferential surface and extending in the circumferential direction by a predetermined length.

  Further, by combining the partition member main body 44 and the lid member 46, a through hole 66 formed in the central portion in the radial direction of the partition member main body 44 and a communication window 68 formed in the central portion in the radial direction of the lid member 46 are formed. A central passage 72 that is aligned with each other and penetrates the partition member 42 in the axial direction is formed.

  Then, with the upper end portion of the partition member 42 inserted in the cylindrical portion 26 of the second mounting bracket 14, the second mounting bracket 14 is subjected to diameter reduction processing such as eight-way drawing. As a result, the cylindrical portion 26 of the second mounting bracket 14 is brought into close contact with the outer peripheral surface of the upper end portion in the axial direction of the partition member 42 via the seal rubber layer 40 and is integrally formed with the lower end portion of the second mounting bracket 14. The first locking protrusion 32 thus fitted is fitted into the first locking groove 48 of the partition member 42, and the partition member 42 is fitted into the axially lower opening of the second mounting bracket 14. It is supposed to be fixed. Further, by subjecting the second mounting member 14 to diameter reduction processing, the tensile stress acting on the main rubber elastic body 16 can be reduced, and the durability of the main rubber elastic body 16 can be improved. A step formed at the boundary portion between the main rubber elastic body 16 and the seal rubber layer 40 is overlapped and closely adhered to the upper end surface of the outer peripheral portion of the partition member 42.

  Further, the inner peripheral surface of the cylindrical portion 26 of the second mounting bracket 14 is brought into close contact with the outer peripheral surface of the upper end portion in the axial direction of the partition member 42 via the seal rubber layer 40, thereby forming the outer peripheral surface of the partition member 42. The opening of the upper circumferential groove 70 thus covered is covered with the cylindrical portion 26 of the second mounting bracket 14 via the seal rubber layer 40. As a result, a tunnel-shaped upper passage 74 extending in the circumferential direction with a predetermined length is formed.

  Further, a diaphragm 76 as a flexible film is disposed below the partition member 42 in the axial direction. The diaphragm 76 is a thin rubber film having a substantially circular dome shape, and can be easily deformed. In addition, a substantially cylindrical cylindrical fixing portion 78 extending upward in the axial direction is integrally formed on the outer peripheral edge portion of the diaphragm 76. Further, a fixing fitting 80 is vulcanized and bonded to the outer peripheral surface of the cylindrical fixing portion 78. The fixing fitting 80 has a thin cylindrical shape with a large diameter, and the inner peripheral surface thereof is covered with a cylindrical fixing portion 78. In addition, an annular second locking projection 82 is integrally formed at the upper end of the fixture 80, and protrudes inward in the direction perpendicular to the axis over the entire circumference. As is clear from the above, the diaphragm 76 in the present embodiment is formed as an integrally vulcanized molded product that is integrally provided with the fixing bracket 80.

  The fixing bracket 80 is extrapolated to the lower end portion of the partition member 42, and the fixing bracket 80 is subjected to diameter reduction processing such as an eight-way drawing. As a result, the inner peripheral surface of the fixing bracket 80 is brought into close contact with the outer peripheral surface of the partition member 42 via the cylindrical fixing portion 78, and the second locking projection 82 of the fixing bracket 80 is formed on the partition member 42. The diaphragm 76 is assembled to the partition member 42 by being fitted in the second locking groove 50. In the partition member 42, a portion located between the first locking groove 48 and the second locking groove 50 in the axial direction is an external portion between the second mounting bracket 14 and the fixing bracket 80 in the axial direction. It is exposed to.

  In the present embodiment, the diameter reduction processing of the second mounting bracket 14 and the diameter reduction processing of the fixing bracket 80 are performed simultaneously. That is, the integral vulcanization molded product 36 of the main rubber elastic body 16, the partition member 42, and the integral vulcanization molded product of the diaphragm 76 are aligned with each other by being set on a jig, etc. The second mounting bracket 14 in the 16 integrally vulcanized molded product 36 and the fixing bracket 80 in the integral vulcanized molded product of the diaphragm 76 are simultaneously drawn, and the main rubber elastic body 16 is applied to the partition member 42. The integrally vulcanized molded product 36 and the integral vulcanized molded product 76 of the diaphragm 76 are fitted and fixed.

  Thus, by assembling the partition member 42 and the diaphragm 76 to the integrally vulcanized molded product 36 of the main rubber elastic body 16, there is a wall portion between the main rubber elastic body 16 and the partition member 42 in the axial direction. While the pressure receiving chamber 84 is formed of the main rubber elastic body 16 and in which an incompressible fluid is enclosed, a part of the wall portion is between the partition member 42 and the diaphragm 76 in the axial direction. Thus, an equilibrium chamber 86 is formed in which an incompressible fluid is enclosed. In the present embodiment, the pressure receiving chamber 84 is formed by covering the opening of the circular recess 34 provided in the main rubber elastic body 16 with the partition member 42, and the central recess provided in the partition member 42. An equilibrium chamber 86 is formed by covering the opening of 52 with a diaphragm 76.

  The incompressible fluid is sealed in the pressure receiving chamber 84 and the equilibrium chamber 86 by assembling the integrally vulcanized molded product 36 of the main rubber elastic body 16 and the partition member 42 and assembling the partition member 42 and the diaphragm 76. It is advantageously realized by performing in an incompressible fluid. The incompressible fluid sealed in the pressure receiving chamber 84 and the equilibrium chamber 86 is not particularly limited, but water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof is preferable. Adopted. Furthermore, it is desirable to employ a low-viscosity fluid having a viscosity of 0.1 Pa · s or less in order to advantageously obtain an anti-vibration effect based on the fluid flow action described later.

  Further, the inner peripheral surface of the fixing bracket 80 is brought into close contact with the outer peripheral surface of the lower end of the partition member 42 via the cylindrical fixing portion 78, so that the outer peripheral side opening of the lower peripheral groove 64 is fluid-tightened by the fixing bracket 80. Covered. Thereby, the lower channel | path 88 extended in the circumferential direction by the predetermined | prescribed length in the lower end part of the partition member 42 is formed. The upper passage 74 and the lower passage 88 are in communication with each other through a through hole (not shown) at one end in the circumferential direction.

  The upper passage 74 communicates with the pressure receiving chamber 84 through a through hole 90 provided in the outer peripheral edge of the lid member 46, and the lower passage 88 is a side wall of the central recess 52 at the lower end portion of the partition member main body 44. Are communicated with the equilibrium chamber 86 through a through-hole 92 provided in a portion constituting the. As a result, the first orifice passage 94 that connects the pressure receiving chamber 84 and the equilibrium chamber 86 to each other is formed by using the upper passage 74 and the lower passage 88 and a through hole (not shown) that connects the passages to each other. . Particularly in the present embodiment, the resonance frequency of the fluid that flows through the first orifice passage 94 by adjusting the ratio of the passage length and the passage sectional area of the first orifice passage 94 corresponds to the engine shake or the like. It is tuned to a low frequency range of about several tens of Hz, and is tuned so as to exhibit a high damping effect based on the fluid flow action when a low frequency large amplitude vibration is input.

  One end of the central passage 72 in the axial direction is opened to the pressure receiving chamber 84 and the other end is opened to the balancing chamber 86. The central passage 72 is used to balance the pressure receiving chamber 84. A second orifice passage 96 is formed which communicates the chamber 86 with each other. In particular, in the present embodiment, the resonance frequency of the fluid that flows through the second orifice passage 96 by adjusting the ratio of the passage length and the passage sectional area of the second orifice passage 96 corresponds to idling vibration or the like. It is tuned to a medium to high frequency range of about 20 to 40 Hz, and tuned to exhibit a low dynamic spring effect based on the fluid flow action when inputting medium to high frequency small amplitude vibrations. As is clear from this, the second orifice passage 96 is tuned in a higher frequency range than the first orifice passage 94.

  In addition, the opening of the accommodation recess 54 formed at the lower center of the partition member 42 in the radial direction is covered with a cover plate fitting 98. The lid plate metal 98 has a thin and substantially disk shape, and is provided so as to spread in the direction perpendicular to the axis. A plurality of communication holes 100 are formed in the intermediate portion of the lid plate metal 98 in the radial direction so as to penetrate the plate thickness direction at a predetermined distance in the circumferential direction. Further, a plurality of circular holes 102 are formed penetrating in the plate thickness direction at a predetermined distance in the circumferential direction on the outer peripheral side of the lid plate metal 98 from the position where the communication hole 100 is formed.

  Then, the lid plate metal 98 is superimposed on the step 58 formed in the boundary portion between the central recess 52 and the housing recess 54 in the partition member main body 44 from the lower side in the axial direction, and the locking projection 60 is formed on the lid plate metal 98. The lid plate fitting 98 is fixed to the partition member 42 by being inserted into the circular hole 102 and locked there.

  As a result, the axially lower opening of the receiving recess 54 is covered with the cover plate fitting 98 to form the receiving area 104. The accommodating region 104 is communicated with the pressure receiving chamber 84 through a second orifice passage 96 formed in the central portion in the radial direction of the partition member 42, and enters the equilibrium chamber 86 through a communication hole 100 formed in the lid plate metal 98. It is communicated. In this embodiment, the equilibration chamber 86 is vertically divided into two in the axial direction with the lid plate metal 98 interposed therebetween, and the bisected regions are formed through the plurality of communication holes 100 formed in the lid plate metal 98. They are in communication with each other. As a result, the storage area 104 substantially constitutes a part of the equilibrium chamber 86.

  In addition, a movable member 106 as a valve body is disposed in the accommodation region 104. The movable member 106 includes a lid portion 108 that has a disk shape that extends in a direction perpendicular to the axis, and a central shaft portion 110 that is integrally formed so as to protrude upward in the axial direction from the radial center portion of the lid portion 108. ing. The movable member 106 is made of a ferromagnetic material such as iron or silicon steel. The movable member 106 is accommodated and disposed in the accommodating region 104 in a state where the protruding tip portion of the central shaft portion 110 is inserted into the opening of the second orifice passage 96 on the equilibrium chamber 86 side, and the lid portion 108 is disposed. The second orifice passage 96 is opposed to the opening on the equilibrium chamber 86 side in the axial direction. In short, in the present embodiment, the movable member 106 is disposed on a line extending downward in the axial direction of the second orifice passage 96.

  Further, a coil spring 112 is disposed between the cover portion 108 of the movable member 106 and the axially opposed surface of the partition member main body 44. The coil spring 112 has a diameter larger than the diameter of the second orifice passage 96 and the same central axis as that of the second orifice passage 96 so as to surround the opening on the equilibrium chamber 86 side of the second orifice passage 96. It is arranged on the top. Further, in the present embodiment, it is formed in the central portion in the radial direction of the upper bottom wall portion of the accommodation recess 54 so as to surround the opening on the equilibrium chamber 86 side of the second orifice passage 96 and protrudes downward. A cylindrical positioning projection is integrally provided. The end portion of the coil spring 112 is extrapolated to the positioning projection, whereby the coil spring 112 is positioned and fixedly disposed in the direction perpendicular to the axis.

  The central shaft portion 110 of the movable member 106 is inserted into the central hole of the coil spring 112 from below in the axial direction, and the lid portion 108 of the movable member 106 overlaps the lower end portion of the coil spring 112 in the axial direction. Has been. In the present embodiment, the central shaft portion 110 of the movable member 106 is inserted in a loosely inserted state with a radial gap with respect to the central hole of the coil spring 112.

  Thereby, the movable member 106 is urged downward in the axial direction by the elastic force of the coil spring 112, and the lid portion 108 of the movable member 106 is axially moved from the partition member 42 in the initial state of the coil spring 112. It is spaced downward and pressed against the lid plate metal 98 from above in the axial direction. Further, the lid portion 108 of the movable member 106 has an outer peripheral edge located on the inner circumferential side of the communication hole 100 formed in the lid plate metal 98. Further, the lid portion 108 of the movable member 106 is spaced downward in the axial direction with respect to the buffer rubber 56 projected from the upper bottom wall surface of the housing recess 54. As a result, the housing region 104 and the equilibrium chamber 86 are communicated with each other between the axial direction of the lid 108 and the buffer rubber 56 and through the communication hole 100, and the second orifice passage 96 is in communication. The initial state of the coil spring 112 refers to a non-load input state in which the coil spring 112 is not stretched or deformed by the action of an external force.

  On the other hand, a coil 114 is embedded in the partition member main body 44. The coil 114 is embedded in the partition member main body 44 when the partition member main body 44 is molded, for example, by being previously set in a mold when the partition member main body 44 is formed by means such as injection molding. Further, in the present embodiment, the coil 114 is provided so as to surround the second orifice passage 96 over the entire circumference, and is disposed in a cylindrical shape that is disposed coaxially with the second orifice passage 96 and extends in the axial direction. Is doing.

  A lead wire 116 connected to the coil 114 is disposed so as to extend inside the partition member main body 44 and is exposed to the outside between the second mounting bracket 14 and the fixing bracket 80 in the axial direction. The partition member main body 44 is taken out from the outer peripheral surface. Furthermore, the lead wire 116 has one end connected to the coil 114 and the other end connected to the power supply device 118. As a result, the coil 114 can be energized from the power supply device 118 through the lead wire 116.

  When the coil 114 is energized from the power supply device 118, the movable member 106 made of a magnetic material is attracted toward the partition member 42 against the urging force of the coil spring 112 by the generated magnetic force. Then, the outer peripheral edge portion of the lid portion 108 of the movable member 106 is pressed against the buffer rubber 56 and is brought into intimate contact with the partition member 42 via the buffer rubber 56. Thereby, when the coil 114 is energized, the opening of the second orifice passage 96 on the side of the equilibrium chamber 86 is substantially closed by the movable member 106, and the second orifice passage 96 is cut off. As is clear from this, the valve means in this embodiment is configured to include the movable member 106, the coil spring 112, and the coil 114, and the valve is based on the elastic force of the coil spring 112 exerted on the movable member 106. The body is opened, and the valve body is closed based on the attractive force exerted on the movable member 106 by energizing the coil 114.

  In the automotive engine mount 10 having the structure according to the present embodiment, the pressure fluctuation generated in the pressure receiving chamber 84 when vibration is input between the first mounting bracket 12 and the second mounting bracket 14. Based on the above, the fluid is caused to flow through the orifice passages 94 and 96, and the vibration isolation effect based on the fluid flow action is exhibited.

  That is, when the input vibration is a low-frequency large-amplitude vibration such as an engine shake, the fluid is transferred between the chambers 84 and 86 through the first orifice passage 94 based on the relative pressure difference between the pressure receiving chamber 84 and the equilibrium chamber 86. Is caused to flow, and a high damping effect based on a fluid action such as a resonance action of the fluid is exhibited, so that an excellent anti-vibration effect against the engine shake can be obtained.

  Here, when a low-frequency large-amplitude vibration is input, the coil 114 is energized from the outside by the power supply device 118, and the coil 114 forms a magnetic field, so that the coil 114 is formed of a ferromagnetic material as shown in FIG. The moved movable member 106 is attracted and displaced toward the bottom surface side of the partition member 42 by the action of magnetic force. As shown in FIG. 2, the outer peripheral edge portion of the lid portion 108 of the movable member 106 is brought into intimate contact with the bottom surface of the partition member 42 via the buffer rubber 56, whereby the second orifice passage. The 96 openings on the equilibrium chamber 86 side are substantially closed by the movable member 106. Thus, the internal pressure fluctuation generated in the pressure receiving chamber 84 is prevented from being absorbed by the fluid flow through the second orifice passage 96, and the amount of fluid flow through the first orifice passage 94 is advantageously ensured. I can do it. Therefore, an anti-vibration effect exhibited by the fluid flow through the first orifice passage 94 can be advantageously obtained.

  On the other hand, when the input vibration is medium to high-frequency small-amplitude vibration such as idling vibration, the first orifice passage 94 tuned to a frequency region lower than the frequency of the input vibration substantially has an anti-resonant action. It is in a blocked state. Furthermore, by stopping energization of the coil 114 by the power supply device 118, the movable member 106 is displaced in a direction away from the partition member 42 by the biasing force of the coil spring 112. Then, the lid portion 108 of the movable member 106 is positioned axially lower than the lower end of the buffer rubber 56, so that the substantially closed state of the lower end opening of the second orifice passage 96 is released, and the second The orifice passage 96 is in communication. As a result, a low dynamic spring effect based on a fluid action such as a resonance action of the fluid that flows between the pressure receiving chamber 84 and the equilibrium chamber 86 through the second orifice passage 96 is exhibited, and an excellent anti-vibration effect against idling vibration. Can be obtained.

  Thus, in the engine mount according to the present embodiment, the urging force of the coil spring 112 exerted on the movable member 106 and the magnetic force generated by energization of the coil 114 and acting on the movable member 106 formed of a ferromagnetic material. Is used to appropriately switch between communication and blocking of the second orifice passage 96, thereby preventing vibrations in the low frequency range corresponding to engine shake and vibrations in the medium to high frequency range corresponding to idling vibration. The anti-vibration effect can be effectively exhibited.

  In the present embodiment, the communication state of the second orifice passage 96 can be realized by using the biasing force of the coil spring 112. Therefore, at the time of vibration input in the middle to high frequency range, the movable member 106 as the valve body can be opened without energizing the coil 114.

  In addition, the electromagnetic switching type fluid-filled engine mount 10 that realizes the opening / closing operation of the movable member 106 by using the magnetic force generated by energizing the coil 114 makes it possible to use the switching type engine mount using air pressure or the like. Compared to the above, it is possible to advantageously reduce the size in the axial direction. Furthermore, by embedding the coil 114 in the partition member 42, the valve means can be built in the engine mount 10 and the switching type engine mount 10 capable of switching the vibration-proof characteristics as appropriate is more compact. Can be realized.

  Moreover, in this embodiment, the partition member main body 44 is a molded product, and the coil 114 is completely isolated from the region where the incompressible fluid is sealed by embedding the coil 114 when the partition member main body 44 is molded. It has come to be. As a result, a stable switching operation can be realized without causing problems such as leakage during energization of the coil 114, and the intended vibration isolation effect can be effectively obtained.

  Further, in the present embodiment, the lead wire 116 is embedded so as to extend inside the partition member 42, and the outer peripheral surface of the intermediate portion in the axial direction of the partition member 42 is exposed to the outside. A lead wire 116 extending inside is taken out directly from the outer peripheral surface of the partition member 42 to the outside. As a result, the lead wire 116 can be prevented from being brought into contact with the incompressible fluid sealed in the pressure receiving chamber 84 or the equilibrium chamber 86, and leakage from the lead wire 116 during energization can be advantageously prevented.

  Further, by realizing the valve means with a simple and inexpensive structure using the movable member 106, the coil spring 112, and the coil 114, the electromagnetic switching type engine mount is compared with the case where a permanent magnet or the like is used for the valve means. 10 can be provided at low cost.

  As mentioned above, although one Embodiment of this invention was described, this is an illustration to the last, Comprising: This invention is not interpreted restrictively at all by the specific description in this Embodiment.

  For example, the movable member 106 as a valve body needs to have a structure integrally including a disc-shaped lid portion 108 and a shaft-shaped central shaft portion 110 as shown in the embodiment. There is no. Specifically, for example, the valve body may have a substantially disk shape or the like that does not have the central shaft portion 110.

  Further, the seal rubber such as the buffer rubber 56 shown in the above embodiment is not necessarily employed. For example, the valve body is directly overlapped with the partition member, thereby blocking the second orifice passage. It may be like this. In addition, for example, when the valve body is attracted to the partition member side and displaced closely, the spiral wire constituting the coil spring is tightened in the axial direction, so that the coil spring has a substantially cylindrical shape with no gap as a whole. The second orifice passage may be blocked by being deformed so as to be exhibited.

  Further, the buffer rubber 56 as the seal rubber does not necessarily have to be fixedly provided to the partition member 42. For example, it is provided on the valve body side and is interposed between the overlapping surfaces of the valve body and the partition member. May be. Further, the shape of the seal rubber is not construed as being limited by the specific description in the embodiment. Specifically, for example, it may be a sheet shape such as an annular plate shape, or may be constituted by a plurality of rubber elastic bodies divided in the circumferential direction, or may be arranged only on a part of the circumference. It may be provided.

  In the embodiment, when the partition member main body 44 is molded, the coil 114 is partitioned into the cavity by previously setting the coil 114 in the cavity and forming the partition member main body 44 as an integrally molded product including the coil 114. It is embedded inside the member 42. However, the coil is not necessarily embedded in the partition member when the partition member is molded.

  Specifically, for example, like the engine mount 120 shown in FIG. 3, the partition member 122 is configured by a partition member main body 124 and a lid member 126 that are overlapped in the axial direction, and the partition member main body 124. A recess 128 is formed in the upper end surface of the coil, and the coil 114 is accommodated in the recess 128. Further, the opening of the recess 128 is sealed with the lid member 126 by overlapping the lid member 126 on the upper surface of the partition member main body 124. Thus, the coil 114 may be assembled to the partition member 122 after the partition member 122 is molded.

  In addition, when the coil 114 is embedded in the partition member 122 by the post-assembly as described above, the opening of the recess 128 that accommodates and arranges the coil 114 is sealed by the lid member 126 so that the coil 114 is accommodated in the accommodation region of the coil 114. It must be sealed so that the enclosed fluid does not enter. For example, in FIG. 3, the rubber layer 130 is formed so as to cover the lower surface of the lid member 126, and the partition member main body 124 and the lid member 126 are overlapped with each other via the rubber layer 130 and are brought into close contact with each other. Yes.

  Moreover, in the said embodiment, although the partition member 42 has a divided structure formed by overlapping the partition member main body 44 and the lid member 46 in the axial direction, the partition member is formed of a single member. Also good.

  In the above-described embodiment, the movable member 106 as a valve body is disposed on the equilibrium chamber 86 side with the partition member 42 interposed therebetween, and the second orifice passage 96 is caused by the displacement of the movable member 106 in the axial direction. The opening on the equilibrium chamber 86 side is substantially opened and closed. However, the valve body does not necessarily have to be disposed on the equilibrium chamber side with respect to the partition member. For example, the valve body is disposed on the pressure receiving chamber 84 side with respect to the partition member 42 and is axially moved upward by the coil spring 112. And the opening of the second orifice passage 96 on the pressure receiving chamber 84 side can be substantially opened and closed by allowing the valve body to be displaced in the axial direction by energizing the coil 114. It may be.

  According to this, when a positive internal pressure fluctuation occurs in the pressure receiving chamber 84 at the time of inputting the low frequency large amplitude vibration, the valve body is separated from the partition member 42 based on the pressure difference between the pressure receiving chamber 84 and the equilibrium chamber 86. The second orifice passage 96 can be advantageously shut off because it is pressed to the side. Note that when the medium or high frequency small amplitude vibration is input, the displacement is relatively small because the amplitude is small, and the communication state of the second orifice passage 96 is stably maintained.

  In the structure in which the valve body is provided on the pressure receiving chamber 84 side, when a negative pressure is generated in the pressure receiving chamber 84 due to an input of a shocking large load, the suction force due to the negative pressure in the pressure receiving chamber 84 is reduced. Based on this, the valve body may be opened. According to this, when an excessive negative pressure is applied to the pressure receiving chamber 84, the second orifice passage 96 is brought into a communication state, and the pressure receiving chamber 84 and the equilibrium chamber 86 are caused by the fluid flow through the second orifice passage 96. The relative pressure difference is quickly eliminated. Therefore, generation of bubbles due to separation of dissolved gas caused by negative pressure can be prevented, and abnormal noise and vibration that can be attributed to the water hammer pressure of a micro jet generated when the bubbles are collapsed can be advantageously prevented.

  Further, in the first and second embodiments, the example in which the present invention is applied to an engine mount for automobiles has been shown. However, the present invention also includes other body mounts for automobiles, and various types of vibration isolators other than automobiles. It is applicable to.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

The longitudinal cross-sectional view which shows the engine mount for motor vehicles as one Embodiment of this invention. The longitudinal cross-sectional view which shows the state by which the 2nd orifice channel | path was interrupted | blocked in the engine mount shown by FIG. The longitudinal cross-sectional view which shows the engine mount for motor vehicles as another one Embodiment of this invention.

Explanation of symbols

10: automotive engine mount, 12: first mounting bracket, 14: second mounting bracket, 16: main rubber elastic body, 42: partition member, 44: partition member main body, 56: shock absorbing rubber, 76: diaphragm, 84: pressure receiving chamber, 86: equilibrium chamber, 94: first orifice passage, 96: second orifice passage, 106: movable member, 112: coil spring, 114: coil, 116: lead wire, 118: power supply device

Claims (4)

The first attachment member attached to one member to be anti-vibration connected and the second attachment member attached to the other member to be anti-vibration connected are connected by a rubber elastic body, and the second attachment Formed on both sides of the partition member supported by the member are a pressure receiving chamber in which a part of the wall is made of the main rubber elastic body and an equilibrium chamber in which a part of the wall is made of a flexible film. And forming a first orifice passage and a second orifice passage tuned in a higher frequency range than the first orifice passage, which allow the pressure receiving chamber and the equilibrium chamber to communicate with each other. In the fluid-filled vibration isolator provided with valve means that is actuated by energization so that the second orifice passage can be switched between a communication state and a cutoff state by the valve means.
Using a valve body made of a ferromagnetic material, the valve body is disposed on the opening of the second orifice passage, and a coil spring is interposed between the partition member and the valve body. In the initial state of the coil spring, the valve element is positioned away from the opening of the second orifice passage so that the second orifice passage is held in communication, while the inside of the partition member The valve means is configured to include a valve body, the coil spring, and the coil by incorporating a coil, and the second orifice passage is blocked by sucking and displacing the valve body by energizing the coil. A fluid-filled vibration isolator characterized by being configured as described above.   The fluid-filled vibration isolator according to claim 1, wherein the partition member is a molded product, and the coil is embedded in the partition member when the partition member is molded.   A seal rubber is interposed between the partition member and the valve means, and when the coil is energized, the valve means comes into close contact with the opening of the second orifice passage via the seal rubber. The fluid-filled vibration isolator according to claim 1 or 2, wherein the fluid is blocked.   4. A part of the partition member is exposed to the outside, and a lead wire connecting the coil member to a power supply device is taken out from the part of the partition member exposed to the outside. The fluid-filled vibration isolator according to the item.

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