JP2008202779A - Fluid filled engine mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid filled engine mount having such novel construction that a valve means for selectively functioning a first or second orifice passage with less power consumption can be compactly formed while suppressing an increase in the size of the mount. <P>SOLUTION: On a fluid flow path in the second orifice passage 108, a valve element 102 and a wall portion 66 are provided overlapping each other in a mutually abutting condition with the energizing force of an energizing means 110 to form communication holes 68, 106 in the abutting portions 66, 102 of the valve element 102 and the wall portion 66 where they do not overlap each other. In the overlapping condition of the valve element 102 and the wall portion 66 with the energizing means 110, the communication holes 68, 106 are both closed to put the second orifice passage 108 into a shut-off condition. On the other hand, by isolating the valve element 102 from the wall portion 66 with the energization of a coil 116, the communication holes 68, 106 are communicated with each other to put the second orifice passage 108 into a communicated condition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine mount that supports a power unit in a vibration-proof manner with respect to a vehicle body, and more particularly to a fluid-filled engine mount that exhibits a vibration-proofing effect based on the flow action of a fluid sealed inside.

  Conventionally, as a kind of engine mounts for automobiles and the like, a first mounting member and a second mounting member that are attached to each of a power unit and a vehicle body are connected to each other with a rubber elastic body, and a part of a wall portion Forms a pressure receiving chamber composed of a rubber elastic body, and an equilibrium chamber composed of a flexible membrane with a part of the wall being easily deformable, and incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber. In addition, there is known a fluid-filled engine mount having a structure in which an orifice passage for communicating both chambers is provided. In such a fluid-filled engine mount, an excellent anti-vibration effect is exhibited by utilizing a fluid action such as a resonance action of a fluid that is caused to flow through the orifice passage.

  By the way, in the engine mount, vibrations in different frequency ranges are input depending on the running state, etc., so that any effective anti-vibration effect can be exhibited against vibrations in different frequency ranges. desirable. However, there is a problem that the vibration-proofing effect based on the fluid action of the fluid flowing through the orifice passage is effectively exhibited only in a relatively narrow frequency range in which the orifice passage is tuned in advance.

  Therefore, in order to solve such a problem, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 59-151537), a first orifice passage and a second orifice passage are respectively provided in a partition member that partitions the pressure receiving chamber and the equilibrium chamber. The second orifice passage is tuned to a higher frequency range than the first orifice passage, and the first and second orifice passages are driven and displaced by the action of a magnetic field generated by energizing the coil. A fluid-filled engine mount that is switched by a valve body has been proposed. According to such a structure, by controlling the energization of the coil according to the traveling state, etc., the vibration isolating effect against the engine shake that is a problem during traveling and the anti-vibration effect against the idling vibration that is a problem when the vehicle is stopped are any. Can also be realized effectively.

  However, it has been clarified by the inventor's investigation that there is still room for improvement in the engine mount described in Patent Document 1.

  That is, in the engine mount described in Patent Document 1, when the second orifice passage is shut off during traveling, the coil is energized from an external power source and the second orifice passage is communicated when the vehicle is stopped. Is configured such that energization of the coil is stopped and the second orifice passage is brought into a communication state by the urging force of the coil spring.

  In such energization control, energization to the coil is required in a running state that is used for a longer time, and therefore the energization time to the coil becomes longer and power consumption increases. As a result, there is a possibility that an adverse effect on fuel consumption or the like may become a problem.

  In addition, in a fluid-filled vibration isolator with a fluid enclosed therein, when the driving force of the valve body is obtained by energizing the coil, in order to avoid problems such as leakage during energization of the coil, The coil had to be installed outside the vibration isolator. Therefore, a sufficient miniaturization of the fluid-filled vibration isolator has not yet been realized.

  In order to cope with the problem inherent in the engine mount described in Patent Document 1, a structure in which the second orifice passage is switched to a communicating state when the coil is energized is disclosed in, for example, Patent Document 2 (US Pat. No. 6921067).

  However, the fluid-filled engine mount described in Patent Document 2 has the following three problems. The first problem is that the valve member for communicating / blocking the second orifice passage spreads in a bowl shape from the center of the mount toward the outer peripheral side, so that a large valve member arrangement space is required, and the mount itself is the shaft. That is, the size is increased in the perpendicular direction. The second problem is that the valve member and the coil spring that urges the valve member are overlapped in series on the mount center axis, so that the space for disposing them increases and the mount itself becomes larger in the axial direction. That is. A third problem is that no reduction effect can be exhibited with respect to the generation of abnormal noise due to cavitation caused by excessive negative pressure generated in the pressure receiving chamber when a shocking heavy load is input.

JP 59-151537 US Pat. No. 6,921,067

  Here, the present invention has been made in the background of the above-described circumstances, and the problem to be solved is a valve member that selectively functions the first and second orifice passages with low power consumption. A fluid-filled engine mount with a novel structure that can achieve an effective vibration-proofing effect against vibrations in two different frequency ranges while suppressing an increase in the size of the mount is provided. There is.

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

  That is, the feature of the present invention is that the first attachment member attached to one of the power unit and the vehicle body and the second attachment member attached to the other of the power unit and the vehicle body are connected by the main rubber elastic body. Then, on both sides of the partition member supported by the second mounting member, a pressure receiving chamber in which a part of the wall portion is composed of a main rubber elastic body and an incompressible fluid is sealed, and one wall portion The portion is formed of a flexible membrane to form an equilibrium chamber in which an incompressible fluid is sealed, and a first orifice passage and a second orifice passage are formed to connect the pressure receiving chamber and the equilibrium chamber to each other. The second orifice passage is tuned to a higher frequency range than the first orifice passage, and a valve means that is operated by energization from the outside is provided, and the second orifice passage is provided by the valve means. In a fluid-filled engine mount that can be switched between a communication state and a shut-off state, the partition member is provided with a valve accommodating region on the fluid flow path through the second orifice passage, and a valve body made of a ferromagnetic material is provided. Displaceably accommodated in the valve accommodating area and provided with a biasing means for biasing the valve body toward the end of displacement toward the equilibrium chamber side, while a coil is disposed around the valve body in the partition member. A valve means for displacing the valve body toward the pressure receiving chamber against the urging force by energizing the valve body, and further, the valve body and the wall portion of the valve housing area that are brought into contact with each other by the urging force of the urging means The contact holes are formed at positions where they do not overlap with each other, and the contact holes between the valve body and the wall portion of the valve housing area are overlapped by the urging force of the urging means. By closing the second orifice passage The second orifice passage is brought into a communication state by opening the communication hole by separating each contact portion between the valve body and the wall portion of the valve accommodating region by energizing the coil. The fluid-filled engine mount.

  In such a fluid-filled engine mount having a structure according to the present invention, the communication holes formed in the overlapping surfaces in the moving direction of the valve body in the valve body and the wall portion of the valve housing region are used to A fluid flow path is formed in which the two orifice passages are in communication with each other, and the valve body is overlapped with the wall portion of the valve accommodating region, so that the two communication holes are not in communication with each other. The orifice passage is shut off.

  As described above, the fluid flow path in the valve means for communicating / blocking the second orifice passage is formed by the communication hole formed to open in the direction in which the second orifice passage extends, which is the moving direction of the valve body. Therefore, the fluid flow path can be formed so as to extend in the direction in which the pressure receiving chamber and the equilibrium chamber are opposed to each other in the partition member, that is, in the mount central axis direction. Therefore, the second orifice passage is communicated / blocked while maintaining the compact mount size without increasing the size of the mount in the direction perpendicular to the axis as in the conventional valve member described in Patent Document 2. Therefore, it is possible to realize the valve means.

  Further, in the fluid-filled engine mount according to the present invention, the valve body has a bottomed cylindrical shape, and a contact portion where the bottom wall portion of the valve body is brought into contact with the wall portion of the valve housing region; And the structure by which the communicating hole is formed in the bottom wall part of a valve body may be employ | adopted. As a result, the peripheral wall portion of the valve body is formed so as to extend in the displacement direction, and the stability of the displacement of the valve body is improved based on the guiding action of the peripheral wall portion of the valve accommodating region to the valve body peripheral wall portion. Can be.

  Further, in the fluid filled engine mount according to the present invention, a coil spring is employed as the urging means, and one end of the coil spring is inserted into the peripheral wall of the valve body and brought into contact with the bottom wall portion of the valve body. A structure arranged in the above state may be adopted. According to such a structure, positioning of the coil spring to the valve body is realized with a simple structure, and a positioning effect in the direction perpendicular to the axis of the valve body by the coil spring can be expected. Furthermore, since the coil spring is disposed inside the valve body, the space for arranging the coil spring can be advantageously secured without limiting the axial size of the valve body.

  Further, in the fluid-filled engine mount according to the present invention, the communication hole in the contact portion of the valve body and the communication hole in the contact portion of the wall portion of the valve storage region are the wall portion of the valve body and the valve storage region. The structure provided in the mutually different position in the direction orthogonal to the contact direction with may be employ | adopted. Thereby, it is possible to set the communication holes of the two members at different positions in the overlapping state without aligning the valve body in the circumferential direction when the valve body is assembled to the valve housing region. .

  In the fluid-filled engine mount according to the present invention, the pressure of the pressure receiving chamber is applied to one surface of the valve body, and the wall of the valve housing region is applied to the other surface of the valve body. The pressure in the equilibrium chamber is applied through the provided communication hole, and the valve body is separated from the wall portion of the valve accommodating region against the urging force of the urging means by the negative pressure generated in the pressure receiving chamber when vibration is input. A structure in which the communication hole is in a communication state at least may be employed. According to such a structure, an excessive negative pressure generated in the pressure receiving chamber when a shocking heavy load is input can be avoided or reduced by opening the valve body associated with the negative pressure. Therefore, it is possible to suppress the generation of abnormal noise and vibration due to cavitation of the pressure receiving chamber without increasing the number of special parts or complicating the structure.

  In the fluid-filled engine mount according to the present invention, the first orifice passage is tuned to a frequency range corresponding to engine shake, and the second orifice passage is tuned to a frequency range corresponding to idling vibration. Accordingly, a structure that is used as an engine mount for an automobile may be employed. According to this, the first orifice passage and the second orifice cause low-frequency vibration corresponding to an engine shake that is likely to be a problem when the automobile is running, and medium to high-frequency vibration that is equivalent to idling vibration that is likely to be a problem when the automobile is stopped. Each fluid can be effectively reduced by a fluid action such as a resonance action of each fluid that is caused to flow through the passage.

  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.

  1 and 2 show an automobile engine mount 10 as a first embodiment of a fluid filled engine mount according to the present invention. The engine mount 10 has a structure in which a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are connected by a main rubber elastic body 16. . 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.

  More specifically, the first mounting member 12 is a rigid material formed of iron, aluminum alloy or the like, 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 28 having a lower side than the middle part in the axial direction and extending in a substantially constant diameter in the axial direction, and the upper side from the middle part in the axial direction is a shaft. The taper portion 30 gradually increases in diameter as it goes upward in the direction. Furthermore, a flange portion 32 that extends outward in the direction perpendicular to the axis is integrally formed at the upper end of the tapered portion 30. Further, an annular first locking protrusion 34 that extends radially inward is integrally formed continuously at the lower end in the axial direction of the second mounting member 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 36 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 30 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 38 that integrally includes the first mounting bracket 12 and the second mounting bracket 14.

  A stopper rubber 40 is integrally formed on the upper end of the main rubber elastic body 16 in the axial direction. The stopper rubber 40 is formed so as to cover the entire outer peripheral portion of the stopper portion 20 of the first mounting bracket 12 and protrudes from the upper surface of the stopper portion 20 at a predetermined height upward in the axial direction. I'm hurt.

  A seal rubber layer 42 is integrally formed at the lower end in the axial direction of the main rubber elastic body 16. The seal rubber layer 42 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 36. The inner peripheral surface of the shaped portion 28 is vulcanized and bonded so as to cover substantially the entire surface. Thereby, the inner surface of the taper part 30 and the cylindrical part 28 is covered with the main body rubber elastic body 16 and the seal rubber layer 42 over the whole surface of the second mounting bracket 14. The seal rubber layer 42 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 42.

  In addition, a partition member 44 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 44 has a substantially circular block shape as a whole. In this embodiment, the upper member 48 of the thin disc shape is overlapped with the upper end surface of the partition member main body 46. The partition member 44 is preferably formed of a material that is not magnetized.

  The partition member main body 46 has a substantially circular block shape, and is formed of a hard synthetic resin material in the present embodiment. The partition member body 46 is formed with first and second locking grooves 50 and 52 that open to the outer peripheral surface and extend continuously in the circumferential direction. The first locking groove 50 is formed at a predetermined distance above the second locking groove 52 in the axial direction.

  In addition, an upper circumferential groove 54 is formed in the upper end portion of the partition member main body 46 so as to open to the outer peripheral surface and continuously extend over a predetermined length in the circumferential direction. In addition, a lower peripheral groove 56 is formed in the lower end portion of the partition member main body 46 so as to open to the outer peripheral surface and continuously extend over a predetermined length in the circumferential direction. In the present embodiment, the upper circumferential groove 54 is formed in a portion of the partition member main body 46 that is positioned on the axially upper side of the first locking groove 50, and the lower circumferential groove 56 is the partition member main body. 46 is formed at a portion located on the lower side in the axial direction than the second locking groove 52 in 46.

  Further, the circumferential ends of the upper circumferential groove 54 and the lower circumferential groove 56 are aligned with each other in the circumferential direction, and are positioned so as to overlap in the axial projection. Further, a not-shown through hole extending linearly in the axial direction between the axial ends of one circumferential end of the upper circumferential groove 54 and one circumferential end of the lower circumferential groove 56 aligned with each other. Is formed. One end of the through hole is opened on the lower surface of the circumferential end of the upper circumferential groove 54, and the other end is opened on the upper surface of the circumferential end of the lower circumferential groove 56. The upper and lower circumferential grooves 54 and 56 are communicated with each other through the through holes. In addition, the axial direction upper side wall part of the upper side circumferential groove 54 is notched in the formation position of a through-hole.

  A lower recess 58 is formed at the lower end of the partition member main body 46. The lower recess 58 is a recess having a substantially circular cross-sectional shape, and is formed so as to open downward in the axial direction at a substantially central portion in the radial direction of the partition member main body 46.

  In the present embodiment, a central recess 60 is formed in the central portion in the radial direction of the lower recess 58. The central recess 60 is a recess having a circular cross section having a smaller diameter than the lower recess 58 and is formed so as to open downward in the axial direction at the center of the bottom wall of the lower recess 58. In the present embodiment, the step portion 62 is formed by the outer peripheral portion of the bottom wall of the lower recess 58 by forming the central recess 60 having a smaller diameter than the lower recess 58. The stepped portion 62 is continuously formed with a substantially constant width over the entire circumference in the circumferential direction, and the upper side in the axial direction across the stepped portion 62 has a recess shape with a smaller diameter than the lower side. . Further, in the present embodiment, the lower recess 58 is formed to be separated from the lower peripheral groove 56 on the inner peripheral side, and the central recess 60 is the inner periphery of the second locking concave groove 52. It is formed apart on the side.

  Further, a through hole 64 extending in the axial direction is formed in the radial center portion of the partition member main body 46. The through holes 64 are formed to extend linearly on the central axis of the partition member main body 46 with a substantially constant circular cross section, and both end portions are respectively opened at both end surfaces in the axial direction of the partition member main body 46. Yes. In the present embodiment, one opening (upper opening in the drawing) of the through hole 64 is opened at the center of the upper end surface of the partition member main body 46 and the other opening (lower side in the drawing). An opening) is opened at the center of the upper bottom portion of the central recess 60, and the upper region sandwiching the partition member main body 46 and the central recess 60 are communicated with each other through the through hole 64.

  A lid fitting 66 is assembled on the lower surface of the partition member main body 46. The lid fitting 66 is a highly rigid member formed of a thin steel plate or the like, and has a substantially disc shape. In the present embodiment, the lid fitting 66 has a smaller diameter than the lower recess 58 and a larger diameter than the central recess 60. The lid metal fitting 66 is formed with a communication hole 68 at a radially intermediate portion. In the present embodiment, a plurality of the communication holes 68 are formed apart from each other in the circumferential direction. A plurality of locking holes 70 are formed on the outer peripheral portion of the lid fitting 66. The locking hole 70 is a small-diameter circular hole and is formed so as to penetrate the lid fitting 66 in the thickness direction.

  Such a lid fitting 66 has an outer peripheral portion superimposed on a stepped portion 62 provided at the boundary between the lower recess 58 and the central recess 60, and protrudes downward in the axial direction from the stepped portion 62. The plurality of provided locking projections 72 are fixedly assembled to the lower center of the partition member body 46 by being inserted into and engaged with the locking holes 70 formed in the outer peripheral portion of the lid fitting 66. ing.

  In addition, when the lid fitting 66 is attached to the partition member body 46, the opening of the central recess 60 formed in the partition member body 46 is covered with the lid fitting 66. Thereby, the valve | bulb accommodation area | region 74 in this embodiment is formed using the center recess 60. FIG.

  An upper plate metal 48 is overlaid on the upper surface of the partition member main body 46. The upper plate metal 48 has a thin, substantially disk shape, and is a highly rigid member formed of a metal material in this embodiment. In the present embodiment, the outer diameter of the upper plate metal 48 is substantially equal to the outer diameter of the partition member main body 46. Further, the upper metal plate 48 is formed with a through hole 76 in a radially intermediate portion. The through hole 76 is formed so as to penetrate the upper plate metal 48 in the thickness direction in the central portion in the radial direction. The through hole 76 is formed with a diameter substantially equal to that of the through hole 64 and is aligned with the through hole 64. Thereby, the valve accommodating region 74 is communicated with the opposite region sandwiching the lid fitting 66 through the communication hole 68, and the opposite region sandwiching the upper plate member 48 through the through hole 64 and the through hole 76. Communicated with.

  Thus, the partition member 44 in this embodiment is comprised by assembling | attaching the upper plate metal 48 to the partition member main body 46. FIG. The partition member 44 is fitted and fixed to the second mounting bracket 14. That is, the upper end portion of the partition member 44 is inserted into the second mounting bracket 14 from below in the axial direction, and the second mounting bracket 14 is subjected to diameter reduction processing such as an eight-way drawing, whereby the partition member 44 is The second mounting member 14 is fixedly assembled. Further, the first locking projection 34 provided at the lower end in the axial direction of the second mounting bracket 14 is engaged with the first locking groove 50 formed on the outer peripheral surface of the partition member body 46. By being fitted together, the partition member 44 is positioned and fixed in the axial direction with respect to the second mounting member 14.

  Further, in the present embodiment, a step is formed at the boundary between the lower end portion of the main rubber elastic body 16 and the seal rubber layer 42, and the upper peripheral edge of the partition member 44 is brought into contact with the step from below. Thus, the partition member 44 is positioned in the axial direction with respect to the second mounting member 14. Further, since the outer peripheral portion of the upper plate metal 48 is disposed between the partition member main body 46 and the step in the axial direction, the upper plate metal 48 is fixedly supported by the second mounting metal 14. ing.

  Further, the outer peripheral surface of the upper end portion of the partition member 44 is fluidly overlapped with the inner peripheral surface of the cylindrical portion 28 of the second mounting bracket 14 via a seal rubber layer 42. As a result, the opening of the upper circumferential groove 54 provided in the partition member 44 is fluid-tightly closed by the cylindrical portion 28 of the second mounting bracket 14, and has a tunnel shape extending in the circumferential direction by a predetermined length. The upper passage 78 is formed.

  A diaphragm 80 as a flexible film is disposed below the partition member 44. The diaphragm 80 is formed of a thin rubber film having a sufficient slack, and has a substantially circular dome shape. In addition, a fixing fitting 82 is vulcanized and bonded to the outer peripheral edge of the diaphragm 80. The fixing fitting 82 has a thin, substantially cylindrical shape, and has a second locking projection 84 whose upper end extends radially inward. Further, the outer peripheral edge of the diaphragm 80 is vulcanized and bonded to the lower end portion of the fixing metal 82, and the covering rubber 86 integrally formed with the diaphragm 80 is vulcanized over the entire inner peripheral surface of the fixing metal 82. It is glued. As is clear from the above, the diaphragm 80 in the present embodiment is formed as an integrally vulcanized molded product provided with the fixing bracket 82.

  The diaphragm 80 is inserted into the lower end portion of the partition member 44 by the fixing bracket 82, and the diameter of the fixing bracket 82 is reduced by an eight-way drawing or the like, so that It is fixedly assembled. Further, the second locking projection 84 provided on the upper end of the fixing bracket 82 is engaged with the second locking groove 52 provided on the outer peripheral surface of the partition member 44, so that the fixing bracket 82 is engaged. Is positioned and fixed with respect to the partition member 44 in the axial direction. As a result, the diaphragm 80 is disposed so as to cover the lower part of the partition member 44 in the axial direction.

  In the present embodiment, the diameter reduction processing of the second mounting bracket 14 and the diameter reduction processing of the fixing bracket 82 are performed simultaneously. That is, the integral vulcanization molded product 38 of the main rubber elastic body 16, the partition member 44, and the integral vulcanization molded product of the diaphragm 80 are aligned with each other by being set on a jig, etc. The second mounting bracket 14 in the 16 integrally vulcanized molded product 38 and the fixing bracket 82 in the integrally vulcanized molded product of the diaphragm 80 are simultaneously drawn, and the main rubber elastic body 16 is applied to the partition member 44. The integrally vulcanized molded product 38 and the integral vulcanized molded product 80 of the diaphragm 80 are fitted and fixed in the same process.

  Thus, by assembling the partition member 44 and the diaphragm 80 to the integrally vulcanized molded product 38 of the main rubber elastic body 16, a wall portion is provided between the main rubber elastic body 16 and the partition member 44 in the axial direction. While the pressure receiving chamber 88 is formed of the main rubber elastic body 16 and the internal pressure fluctuation is generated when vibration is input, a part of the wall portion is between the partition member 44 and the diaphragm 80 in the axial direction. An equilibrium chamber 90 is formed, which is configured with 80 and is easily allowed to change in volume. The pressure receiving chamber 88 and the equilibrium chamber 90 are both filled with an incompressible fluid. In the present embodiment, the pressure receiving chamber 88 is formed by covering the opening of the circular recess 36 provided in the main rubber elastic body 16 with the partition member 44, and the lower recess provided in the partition member 44. The equilibrium chamber 90 is formed by covering the opening of the place 58 with a diaphragm 80.

  The incompressible fluid is enclosed in the pressure receiving chamber 88 and the equilibrium chamber 90 by assembling the integrally vulcanized molded product 38 of the main rubber elastic body 16 and the partition member 44 and assembling the partition member 44 and the diaphragm 80. This is advantageously realized by performing in an incompressible fluid. The incompressible fluid sealed in the pressure receiving chamber 88 and the equilibrium chamber 90 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 82 is overlapped with the outer peripheral surface of the lower end of the partition member 44 via the covering rubber 86, so that the outer peripheral opening of the lower peripheral groove 56 is covered with the fixing bracket 82 in a fluid-tight manner. The As a result, a lower passage 92 is formed that extends the lower end portion of the partition member 44 in the circumferential direction by a predetermined length.

  Further, as described above, the upper passage 78 and the lower passage 92 are communicated with each other through a not-shown through-hole, thereby forming a tunnel-like passage extending as a whole with a predetermined length in the circumferential direction. Has been.

  Furthermore, one end of the tunnel-shaped passage is communicated with the pressure receiving chamber 88 through a notch 94 formed in the outer peripheral edge of the partition member main body 46 and the upper plate metal 48. Further, the other end of the tunnel-shaped passage is communicated with the equilibrium chamber 90 through a communication passage 96 that penetrates the peripheral wall portion of the lower recess 58 in the radial direction. As a result, a first orifice passage 98 that connects the pressure receiving chamber 88 and the equilibrium chamber 90 to each other is formed by using the upper passage 78, the lower passage 92, and a through hole (not shown).

  Further, the valve member 100 is accommodated in the valve accommodating region 74 provided in the partition member 44. The valve member 100 includes a valve fitting 102 as a valve body, and a buffer rubber layer 104 fixed to the valve fitting 102, and has a disk shape as a whole. Further, the valve member 100 is positioned on the extension line of the through hole 64 and is disposed so as to spread in the direction perpendicular to the axis in the valve accommodating region 74.

  The valve fitting 102 is a ferromagnetic body made of a magnetic material such as iron or silicon steel, has a thin and substantially disk shape, and has an outer diameter slightly smaller than the inner diameter of the valve housing region 74. Has been. In addition, a communication window 106 as a communication hole penetrating in the plate thickness direction with a diameter substantially equal to the through hole 64 is formed in the central portion in the radial direction of the valve fitting 102. The communication window 106 is provided at a position that is different from the communication hole 68 formed in the lid fitting 66 in the radial direction under the arrangement state of the valve member 100 in the valve accommodating region 74. In the present embodiment, The communication window 106 is positioned in the center in the radial direction, and is separated from the outer peripheral side so as to surround the communication window 106, that is, in a state where both the members 102 and 66 are overlapped as shown in FIG. A plurality of communication holes 68 are positioned so that the communication holes 68 do not overlap at all.

  Further, a buffer rubber layer 104 is fixed to the lower surface of the valve fitting 102. The buffer rubber layer 104 has an annular plate shape that is substantially the same shape as the valve fitting 102, and is fixed so as to cover the entire lower surface of the valve fitting 102.

  Here, the pressure receiving chamber 88 and the equilibrium chamber 90 are communicated with each other through the through hole 76, the through hole 64, the valve accommodating region 74, the communication window 106, and the communication hole 68. In the present embodiment, the pressure receiving chamber 88 is connected. The second orifice passage 108 that communicates with the balance chamber 90 is constituted by a through hole 76, a through hole 64, a valve accommodating region 74, a communication window 106, and a communication hole 68.

  In this embodiment, as can be seen from the drawings, the cross-sectional area of the through hole 76, the cross-sectional area of the through hole 64, the cross-sectional area of the communication window 106, and the total cross-sectional area of the plurality of communication holes 68 are as follows. They are almost the same. In this embodiment, the tuning frequency of the second orifice passage 108 is set by appropriately setting the ratio of the cross-sectional area of the through hole 64, the communication window 106, and the communication hole 68 to the passage length of the second orifice passage 108. Is tuned to a higher frequency range than the tuning frequency of the first orifice passage 98.

  A coil spring 110 as an urging unit is disposed between the partition member main body 46 and the valve member 100 in the axial direction. The coil spring 110 is disposed on the same central axis as the valve member 100, and is disposed in a pre-compressed state between the partition member main body 46 and the valve member 100 in the present embodiment. In the present embodiment, the central portion of the lower end of the partition member main body 46 is slightly protruded downward, and the upper end of the coil spring 110 is externally fitted to the protruding portion, so that the coil spring 110 is perpendicular to the axis. Positioned in the direction.

  The valve spring 100 is biased downward in the axial direction by the coil spring 110 arranged in this manner, and is pressed against the lid fitting 66 from above in the axial direction. As is clear from this, in the present embodiment, each contact portion between the valve body according to the claims and the wall portion of the valve housing region is formed by each overlapping portion of the valve fitting 102 and the lid fitting 66. Is configured.

  Here, the communication hole 68 formed in the lid fitting 66 and the communication window 106 formed in the valve member 100 are provided at mutually different positions in the radial direction, so that the communication hole formed in the lid fitting 66 is provided. 68 is closed by the valve member 100, and the communication window 106 formed in the valve member 100 is closed by the lid fitting 66. In addition, since the lid fitting 66 and the valve fitting 102 are brought into close contact with each other via the buffer rubber layer 104, the communication hole 68 and the communication window 106 are both shut off in a fluid-tight manner.

  As a result, the valve housing region 74 and the pressure receiving chamber 88 are fluid-tightly separated by the valve member 100 and the lid fitting 66 under the non-energized state of the coil described later, and the second orifice passage 108 is cut off. It has become so. Note that the second orifice passage 108 being blocked means a state in which no fluid flow is generated in the second orifice passage 108.

  A coil member 112 is embedded in the partition member 44. The coil member 112 includes a yoke 114 and a coil 116 wound around the yoke 114. The yoke 114 is made of a ferromagnetic material, and has an annular plate-shaped upper bottom plate portion, an inner peripheral side wall portion extending upward from the inner peripheral edge portion of the upper bottom plate portion, and an outer peripheral edge portion of the upper bottom plate portion. It has a substantially cylindrical shape provided integrally with an outer peripheral side wall portion extending upward. A coil 116 is disposed between the inner peripheral side wall and the outer peripheral side wall in the radial direction. Thereby, the coil member 112 having a substantially cylindrical shape is configured.

  In this embodiment, such a coil member 112 is arranged coaxially with the through hole 64 and is embedded in the partition member main body 46 so as to surround the through hole 64 over the entire circumference. In the present embodiment, for example, the coil member 112 is set in the mold when the partition member body 46 is formed by means such as injection molding. Embedded.

  Further, in the present embodiment, the lead wire 118 connected to the coil 116 is disposed so as to extend inside the partition member main body 46, and between the second mounting bracket 14 and the fixing bracket 82 in the axial direction. It is taken out from the outer peripheral surface of the partition member main body 46 exposed to the outside. Furthermore, the lead wire 118 has one end connected to the coil 116 and the other end connected to the power supply device 120. As a result, the coil 116 can be energized from the power supply device 120 through the lead wire 118.

  Here, when the coil 116 is energized from the power supply device 120, an attractive force is applied to the valve fitting 102 made of a magnetic material by the generated magnetic force. The valve member 100 is attracted and displaced toward the partition member main body 46 against the urging force of the coil spring 110 by the action of the magnetic attraction force (see FIG. 2).

  In the present embodiment, the buffer rubber 122 is interposed between the partition member main body 46 and the valve member 100 in the axial direction. The buffer rubber 122 has a substantially annular shape, and is disposed so as to be separated from the outer peripheral side of the coil spring 110 and extend over the entire circumference with a substantially constant cross-sectional shape. In the present embodiment, the buffer rubber 122 is vulcanized and bonded to the bottom wall portion of the central recess 60, and protrudes downward in the axial direction. By providing such a buffer rubber 122, in this embodiment, when the valve member 100 is sucked and displaced toward the partition member main body 46 when the coil 116 is energized, the valve member 100 is interposed via the buffer rubber 122. Thus, it is brought into contact with the partition member main body 46 in a buffering manner. Therefore, it is possible to reduce or avoid the occurrence of sound and impact caused by the contact of the valve member 100 with the partition member main body 46.

  Due to such displacement of the valve member 100, the valve member 100 is separated from the lid fitting 66 in the axial direction upward, so that the communication hole 68 and the communication window 106 are connected, and the valve housing region 74 is connected to the communication hole 68 and The equilibrium chamber 90 is communicated with the communication window 106. As a result, the second orifice passage 108 is in communication with the coil 116 in an energized state. Therefore, when the coil 116 is energized, the pressure receiving chamber 88 and the equilibrium chamber 90 are communicated with each other through the second orifice passage 108.

  In short, in the present embodiment, by controlling the power supply to the coil 116, the valve member 100 can be displaced in the approaching direction and the separation direction with respect to the lid fitting 66, and the second orifice passage 108 is blocked. It is possible to switch between the state and the communication state.

  The second orifice passage 108 being in a communicating state means a state in which fluid flow is generated in the second orifice passage 108. That is, in the present embodiment, when the valve accommodating region 74 is brought into communication with the equilibrium chamber 90 by the opening operation of the valve member 100 at the time of vibration input in the tuning frequency region of the second orifice passage 108, fluid pressure fluctuations occur. The pressure receiving chamber 88 and the equilibrium chamber 90 in which the volume change is easily allowed are communicated with each other through the second orifice passage 108, and the second orifice passage is based on the pressure difference between the pressure receiving chamber 88 and the equilibrium chamber 90. A fluid flow is generated at 108. Thus, the second orifice passage 108 is brought into a communication state under the open operation state of the valve member 100 when the coil 116 is energized.

  As is clear from the above, in this embodiment, the valve means is configured to include the valve member 100, the coil spring 110, and the coil 116, and is based on the elastic force of the coil spring 110 exerted on the valve member 100. Thus, the valve body is closed and the valve body is opened based on the suction force exerted on the valve fitting 102 by energization of the coil 116.

  In the automotive engine mount 10 according to this embodiment, when vibration is input between the first mounting bracket 12 and the second mounting bracket 14, based on the pressure fluctuation generated in the pressure receiving chamber 88. The fluid is caused to flow through the orifice passages 98 and 108, and the vibration isolation effect based on the fluid flow action is exhibited.

  That is, in this embodiment, during normal driving of the automobile, the coil member 116 is not energized by the external power supply device 120, whereby the valve member 100 is closed by the urging force of the coil spring 110. The orifice passage 108 is blocked. Thereby, the fluid flow through the first orifice passage 98 is effectively generated based on the relative pressure difference between the pressure receiving chamber 88 and the equilibrium chamber 90, and is caused to flow between the pressure receiving chamber 88 and the equilibrium chamber 90. An excellent anti-vibration effect based on a fluid action such as a resonance action of the fluid is exhibited.

  In the present embodiment, the resonance frequency of the fluid that flows through the first orifice passage 98 under the closed operation state of the valve member 100 is tuned to a low frequency range of about several tens of Hz. The vibration isolation effect based on the fluid action of the fluid that is caused to flow through is effectively exhibited against vibration corresponding to the engine shake of an automobile. The tuning frequency of the first orifice passage 98 can be set by appropriately adjusting the ratio between the passage length and the passage sectional area.

  On the other hand, when the automobile is stopped, power is supplied to the coil 116 from the outside by the power supply device 120. When the coil 116 forms a magnetic field, the valve fitting 102 made of a ferromagnetic material is caused by the action of magnetic force. It is displaced by suction upward in the axial direction on the partition member main body 46 side. Then, as shown in FIG. 2, the valve fitting 102 is separated from the lid fitting 66 in the axial direction upward, whereby a communication hole 68 formed in the lid fitting 66 and a communication window formed in the valve member 100. 106 is communicated, and the second orifice passage 108 is brought into communication. As a result, the pressure receiving chamber 88 and the equilibrium chamber 90 are communicated with each other through the second orifice passage 108. Therefore, an excellent anti-vibration effect based on a fluid action such as a resonance action of the fluid that is caused to flow through the second orifice passage 108 is exhibited.

  In the present embodiment, the resonance frequency of the fluid that flows through the second orifice passage 108 is tuned to a medium to high frequency range of about 15 to 40 Hz, and the fluid action of the fluid that flows through the second orifice passage 108. The anti-vibration effect based on the above is effectively exerted against vibration corresponding to medium to high-frequency idling vibration of the automobile.

  Moreover, as a use state of an automobile, the traveling state is used for a longer time than the stopped state. Therefore, according to the present embodiment in which the coil 116 is energized when the vehicle is stopped, the energization time to the coil 116 can be shortened. Therefore, the power consumption can be suppressed, and the fuel consumption of the automobile can be improved and the heat generation can be reduced.

  Further, in the present embodiment, the valve fitting 102 and the lid fitting 66 abut against each other through the cushioning rubber layer 104 when the coil 116 is not energized. Therefore, it is possible to prevent the occurrence of hitting sound and impact when switching from the energized state to the non-energized state. Further, between the partition member main body 46 and the valve member 100 in the axial direction, a buffer rubber 122 fixed to the bottom wall portion of the central recess 60 is provided, and when the coil 116 is energized, the valve member 100 is separated from the partition member. The main body 46 is abutted against the body 46 in a buffering manner. Therefore, the hitting sound and impact can be reduced or avoided even when switching from the non-energized state to the energized state.

  Further, by embedding the coil 116 in the partition member main body 46, contact between the coil 116 and the sealed fluid can be completely avoided. Moreover, in the present embodiment, the lead wire 118 that connects the coil 116 and the external power supply device 120 is also provided so as to extend in the partition member body 46, and is directly taken out from the outer peripheral surface of the partition member body 46. ing. Therefore, contact between the lead wire 118 and the sealed fluid can be advantageously prevented. Therefore, it is possible to advantageously avoid problems such as leakage due to contact of the energized portion with the enclosed incompressible fluid.

  In the present embodiment, the second orifice passage 108 is blocked by pressing the valve fitting 102 against the lid fitting 66 that is the wall surface of the valve accommodating region 74 on the equilibrium chamber 90 side. . In addition, when the biasing force exerted on the valve fitting 102 by the coil spring 110 is appropriately adjusted, and when a large negative pressure is generated in the pressure receiving chamber 88 due to the input of large amplitude vibration, the valve fitting 102 has a negative pressure. Due to the action, the coil spring 110 can be separated from the lid fitting 66 against the urging force of the coil spring 110. As a result, when an excessive negative pressure is generated in the pressure receiving chamber 88 due to the input of a shocking large load, the second orifice passage 108 is brought into communication, and the fluid passing through the second orifice passage 108 is fluidized. The negative pressure in the pressure receiving chamber 88 is quickly eliminated by the flow. Therefore, it is possible to advantageously prevent the generation of abnormal noise and vibration due to cavitation which is considered to be caused by the negative pressure in the pressure receiving chamber 88.

  Next, FIG. 3 shows an automobile engine mount 124 as a second embodiment of the present invention. In the following description, members or parts that are substantially the same as those of the engine mount 10 shown in the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  That is, the automobile engine mount 124 according to the present embodiment includes the partition member 126. The partition member 126 has a thick, substantially circular block shape as a whole, and includes a partition member main body 128 and an upper plate metal 48.

  The partition member main body 128 is a member formed of a hard synthetic resin material, and has a thick, substantially circular block shape. Further, the partition member main body 128 is formed with an upper recess 132 that opens upward in the axial direction at the radial center portion. The upper recess 132 in the present embodiment is a deep bottom circular recess and extends in the axial direction with a substantially constant cross-sectional shape.

  A lower recess 134 is formed at the lower end of the partition member main body 128. The lower recess 134 is a recess having a substantially constant circular cross section, and is formed so as to open downward in the axial direction at the radial center portion of the partition member main body 128. The upper recess 132 and the lower recess 134 are formed at a predetermined distance in the axial direction. In this embodiment, the upper recess 132 has a smaller diameter and a deeper bottom than the lower recess 134. Yes.

  In addition, a through hole 136 as a communication hole in the present embodiment is formed in the radial center portion of the partition member main body 128. The through hole 136 extends in the axial direction with a substantially constant circular cross section, and the upper recess 132 and the lower recess 134 communicate with each other through the through hole 136.

  The upper plate metal 48 is made of a metal material such as iron or aluminum alloy, and has a thin and substantially disk shape. Further, a through hole 76 is formed through the central portion in the radial direction in the thickness direction. The through hole 76 is a circular hole formed in the central portion of the upper plate 48 in the radial direction, and is formed so as to penetrate the upper plate 48 in the plate thickness direction.

  And the partition member 126 is comprised by the upper-plate metal fitting 48 being piled up with respect to the partition member main body 128 from upper direction. Further, under the assembled state of the partition member main body 128 and the upper plate metal 48, the opening of the upper recess 132 formed in the partition member main body 128 is covered with the upper plate metal 48, and the upper recess 132 is A valve accommodating region 142 is formed by using the same.

  The partition member 126 has an upper end portion fitted and fixed to the second mounting member 14, and a diaphragm 80 is assembled to the lower end portion thereof. Thereby, the pressure receiving chamber 88 is formed on the upper side in the axial direction across the partition member 126, and the equilibrium chamber 90 is formed on the lower side. In the present embodiment, the valve accommodating region 142 is communicated with the pressure receiving chamber 88 through a through hole 76 formed in the upper plate metal 48 and is also in an equilibrium chamber through a through hole 136 formed in the partition member main body 128. No. 90 is communicated.

  Here, a valve fitting 144 as a valve element is accommodated in the valve accommodating area 142. The valve fitting 144 is a ferromagnetic body made of a magnetic material such as iron, and has a substantially bottomed cylindrical shape as a whole. Further, the outer diameter of the valve fitting 144 is slightly smaller than the inner diameter of the valve housing region 142, and a gap is provided between the outer peripheral surface of the valve fitting 144 and the inner surface of the side wall of the valve housing region 142. ing.

  In addition, a communication window 146 is formed on the bottom wall portion of the valve fitting 144 as a plate-like portion in the present embodiment. A plurality of communication windows 146 are provided at a predetermined distance in the circumferential direction, and are formed so as to penetrate the bottom wall portion of the valve fitting 144 in the axial direction that is the plate thickness direction. Further, the communication window 146 formed in the valve fitting 144 is located at a position different in the radial direction with respect to the through hole 136 formed in the partition member main body 128 under the state in which the valve fitting 144 is disposed in the valve housing region 142. Is formed. In the present embodiment, the opening portion of the through hole 136 is formed at the substantially center in the radial direction, and the plurality of communication windows 146 are positioned so as to be spaced apart from the outer peripheral side so as to surround the opening portion of the through hole 136. .

  Here, in the present embodiment, the pressure receiving chamber 88 and the equilibrium chamber 90 are communicated with each other through the through hole 76, the valve accommodating region 142, the communication window 146, and the through hole 136. The second orifice passage 148 in this embodiment is configured by the through hole 76 formed between the pressure receiving chamber 88 and the equilibrium chamber 90 in the axial direction, the valve accommodating region 142, the communication window 146, and the through hole 136. .

  In the present embodiment, the cross-sectional area of the through-hole 76, the total cross-sectional area of the communication window 146, and the cross-sectional area of the through-hole 136 are substantially equal, and the through-hole 76, the communication window 146, and the through-hole 136 By adjusting the ratio between the cross-sectional area and the passage length of the second orifice passage 148, the tuning frequency of the second orifice passage 148 is adjusted to a frequency corresponding to idling vibration in a higher frequency range than the first orifice passage 98. Is set.

  A coil spring 110 is assembled to the valve fitting 144 having a bottomed cylindrical shape. In this embodiment, the coil spring 110 is inserted on the inner peripheral side of the valve fitting 144, and the coil spring 110 is only a predetermined amount between the axially facing surfaces of the bottom wall portion of the valve fitting 144 and the upper plate fitting 48. It is inserted in a pre-compressed state.

  Since the coil spring 110 is disposed between the valve fitting 144 and the upper plate fitting 48 in this way, the valve fitting 144 is pivoted by the elastic force of the coil spring 110 under the non-energized state of the coil described later. The bottom wall portion of the valve fitting 144 is pressed against the lower wall portion of the valve accommodating region 142 from above. Then, the bottom wall portion of the valve fitting 144 is pressed against the bottom wall portion of the valve accommodating region 142, whereby the through hole 136 is blocked by the valve fitting 144, and the communication window 146 is the bottom of the valve accommodating region 142. It is blocked by the outer periphery of the wall. As a result, the second orifice passage 148 is cut off when the coil is not energized.

  A coil member 150 is embedded in the partition member 126. The coil member 150 includes a yoke 152 and a coil 116. The yoke 152 is made of a magnetic material, and an annular plate-shaped upper yoke fitting 156 is assembled from above with a substantially bottomed cylindrical lower yoke fitting 154 having an annular plate-like bottom wall portion. It has a structure. The coil member 150 is configured by disposing the coil 116 between the bottom wall portion of the lower yoke fitting 154 and the facing surface of the upper yoke fitting 156.

  The coil member 150 having such a structure is disposed inside the partition member main body 128. That is, the coil member 150 is disposed so as to surround the outer peripheral side of the valve housing region 142. In this embodiment as well, the coil member 150 is embedded when the partition member main body 128 is molded, as in the first embodiment.

  Here, when power is supplied to the coil 116 from the external power supply device 120, the yoke 152 is magnetized by the action of the magnetic field generated by the coil 116. The upper end of the valve fitting 144 made of a magnetic material is sucked by the magnetized upper yoke fitting 156, and the valve fitting 144 is sucked and displaced upward in the axial direction. As the valve fitting 144 is displaced in this way, the bottom wall portion of the valve fitting 144 is separated upward from the bottom wall portion of the valve accommodating region 142, and the communication window 146 formed in the valve fitting 144 and the partition member are separated. The through hole 136 formed in the main body 128 is in a communicating state. As a result, the second orifice passage 148 is brought into communication with the coil 116 energized. Therefore, when the coil 116 is energized, the pressure receiving chamber 88 and the equilibrium chamber 90 are communicated with each other through the second orifice passage 148.

  The automobile engine mount 124 having the structure according to the present embodiment provides the same effects as the automobile engine mount 10 shown in the first embodiment. That is, by controlling energization to the coil 116 and opening and closing the valve fitting 144 according to the running state of the vehicle, any vibration input of engine shake, medium to high frequency idling vibration, and low frequency idling vibration is applied. In contrast, an effective vibration isolation effect can be obtained.

  In addition, in this embodiment, since the coil 116 is energized when the vehicle is stopped, the energization time can be made relatively short, and the consumption of electric power can be suppressed to improve fuel efficiency. This can be done advantageously.

  Also in the present embodiment, when an excessive negative pressure is generated in the pressure receiving chamber 88 by the input of a shocking large load, the valve fitting 144 is based on the pressure difference between the pressure receiving chamber 88 and the equilibrium chamber 90. By separating the second orifice passage 148 from the bottom wall portion of the valve accommodating region 142, the negative pressure in the pressure receiving chamber 88 is rapidly increased by the fluid flow through the second orifice passage 148. It has been resolved. Therefore, it is possible to reduce or avoid generation of abnormal noise and vibration due to cavitation that is considered to be caused by the negative pressure in the pressure receiving chamber 88.

  As mentioned above, although some embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this embodiment.

  For example, the valve element is not limited in any way by the structures shown in the first and second embodiments.

  For example, in the first and second embodiments, the coil 116 is embedded in the partition member body 46 (128) constituting the partition member 44 (126), but the coil 116 is not necessarily limited to the partition member body 46 (128). Embedded in the partition member 44 (126). That is, by forming a recess in which the coil 116 is disposed in the partition member, disposing the coil 116 in the recess, and providing a lid member so as to cover the opening of the recess fluid-tightly, The coil 116 may be arranged inside the partition member.

  In the first and second embodiments, the yoke 114 (152) made of a ferromagnetic material is disposed around the coil 116. However, the yoke is not always necessary. You may arrange | position inside the partition member in the state assembled | attached to the bobbin formed with the magnetic synthetic resin material.

  The structures of the first and second mounting brackets 12 and 14 and the partition member 44 (126) are not limitedly interpreted by the specific descriptions in the first and second embodiments. For example, the partition member does not necessarily have a part of the outer peripheral surface exposed to the outside, and is pressed into the inner peripheral side of the cylindrical second mounting bracket, so that the second mounting bracket It may be assembled.

  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 non-energized state of the engine mount for motor vehicles as 1st embodiment of this invention. The longitudinal cross-sectional view which shows the electricity supply state of the engine mount for motor vehicles shown by FIG. The longitudinal cross-sectional view which shows the engine mount for motor vehicles as 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Engine mount for motor vehicles, 12: 1st attachment metal fitting, 14: 2nd attachment metal fitting, 16: Main body rubber elastic body, 44: Partition member, 66: Cover metal fitting, 68: Communication hole, 74: Valve accommodation area | region 76: Through-hole, 80: Diaphragm, 88: Pressure receiving chamber, 90: Equilibrium chamber, 98: First orifice passage, 100: Valve member, 102: Valve fitting, 106: Communication window, 108: Second orifice passage 110: Coil spring, 116: Coil

Claims (6)

A first attachment member attached to one of the power unit and the vehicle body and a second attachment member attached to the other of the power unit and the vehicle body are connected by a rubber elastic body, and supported by the second attachment member. A pressure receiving chamber in which a part of the wall part is made of the main rubber elastic body and incompressible fluid is sealed, and a part of the wall part is made of a flexible membrane on both sides of the partition member. Forming an equilibrium chamber filled with an incompressible fluid, and forming a first orifice passage and a second orifice passage for communicating the pressure receiving chamber and the equilibrium chamber with each other. The second orifice passage is tuned to a higher frequency range than the passage, and a valve means that is operated by energization from the outside is provided, and the second orifice passage is communicated with the communication state by the valve means. In switchable between the fluid-filled engine mount,
The partition member is provided with a valve accommodating region on the fluid flow path through the second orifice passage, and a valve body made of a ferromagnetic material is accommodated in the valve accommodating region so as to be displaceable. While providing a biasing means for biasing toward the end of displacement toward the equilibrium chamber, a coil is disposed around the valve body in the partition member, and the valve body is biased by energizing the coil. The valve means that is displaced against the pressure-receiving chamber side is configured, and each contact between the valve body and the wall portion of the valve housing area that are brought into contact with each other by the urging force of the urging means The communication holes are formed in the portions so as not to overlap with each other, and the contact portions of the valve body and the wall portion of the valve accommodating region are overlapped by the urging force of the urging means to close the communication holes. To cause the second orifice passage to be blocked, and The second orifice passage is brought into a communication state by opening the communication hole by separating each contact portion between the valve body and the wall portion of the valve accommodating region by energizing the cylinder. A fluid-filled engine mount.   The valve body has a bottomed cylindrical shape, and the bottom wall portion of the valve body serves as the abutting portion that abuts against the wall portion of the valve accommodating region, and the bottom wall of the valve body The fluid-filled engine mount according to claim 1, wherein the communication hole is formed in a portion.   A coil spring is employed as the biasing means, and one end of the coil spring is inserted into the peripheral wall of the valve body and disposed in contact with the bottom wall of the valve body. The fluid-filled engine mount described in 1.   The communication hole in the contact portion of the valve body and the communication hole in the contact portion of the wall portion of the valve housing region are orthogonal to the contact direction of the valve body and the wall portion of the valve housing region. The fluid-filled engine mount according to any one of claims 1 to 3, wherein the fluid-filled engine mount is provided at a position different from each other in a direction to be operated.   A pressure of the pressure receiving chamber is applied to one surface of the valve body, and the equilibrium chamber is provided to the other surface of the valve body through the communication hole provided in a wall portion of the valve housing region. The valve body is separated from the wall portion of the valve housing area against the urging force of the urging means by the negative pressure generated in the pressure receiving chamber when vibration is input. The fluid-filled engine mount according to any one of claims 1 to 4, wherein the communication hole is in a communication state.   The first orifice passage is tuned to a frequency range corresponding to an engine shake, and the second orifice passage is tuned to a frequency range corresponding to idling vibration, thereby forming an automobile engine mount. The fluid-filled engine mount according to any one of claims 1 to 5.

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