JP2006266425A - Liquid filled active vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid filled vibration damper which can effectively improve its vibration damping performance by favorably securing the cross section and the length of an orifice passage without enlarging the size of the damper. <P>SOLUTION: The orifice passage 182 for communicating a main liquid chamber 148 with a sub-liquid chamber 150 is formed by connecting, in series, a first annular passage 170 formed by utilizing a first annular fixed member 22 fixed to the outside peripheral surface on the large diameter side of a body rubber elastic member 16 and a second annular passage 172 formed by utilizing a second annular fixed member 74 fixed to the outer peripheral edge portion of a supporting rubber elastic member 70. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an active vibration isolator capable of exhibiting an anti-vibration effect that is positive or counteract with respect to vibration to be vibrated, and a part of a wall portion of a pressure receiving chamber in which an incompressible fluid is sealed. The active fluid-filled vibration isolator is configured to obtain an active vibration isolating effect by controlling the pressure in the pressure receiving chamber by driving the vibration member with the vibration means. It relates to the device.

  Conventionally, fluid is sealed as a type of anti-vibration coupling body or anti-vibration support body that is interposed between members to be anti-vibrated, such as engine mounts and body mounts for automobiles. A vibration isolator of the type is known. Such a vibration isolator is configured such that a first mounting bracket and a second mounting bracket which are attached to respective members to be vibration-proofed are connected by a main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body. The pressure receiving chamber to which vibration is input and a part of the wall are made of a flexible membrane composed of a flexible membrane that can be easily deformed, and an incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber. In addition, both chambers are configured to communicate with each other through an orifice passage. In such a fluid-filled vibration isolator, when vibration is input to the pressure receiving chamber, the resonance action of the fluid that is caused to flow through the orifice passage based on the pressure difference caused between the pressure receiving chamber and the equilibrium chamber. A passive vibration isolation effect based on the fluid action such as the above will be exhibited.

  However, in such an anti-vibration device that uses only the passive anti-vibration function, when the characteristics such as the frequency of vibration to be anti-vibration change or a higher anti-vibration effect is required, It was difficult to achieve a sufficient anti-vibration effect.

  Therefore, in recent years, by using an electromagnetic or pneumatic actuator, the pressure in the pressure receiving chamber is actively controlled at a cycle corresponding to the frequency of the vibration to be isolated, so that the vibration is actively reduced. A fluid-filled active vibration isolator has been developed and studied. In such an active fluid-filled vibration isolator, for example, as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-188877) and the like, another part of the wall portion of the pressure receiving chamber is used as a vibration plate. In addition, the pressure of the pressure receiving chamber is controlled based on elastically supporting the vibration plate to be displaceable on the second mounting bracket or the like via a support rubber elastic body and oscillating and displacing with an actuator. It has become. As a result, for vibrations in a relatively low frequency range such as an engine shake, for example, a passive vibration isolation effect based on a flow action (orifice effect) such as a resonance action of fluid through the orifice passage is obtained, while idling vibration is obtained. With respect to vibrations in a relatively high frequency range such as traveling noise and traveling noise, it is possible to obtain an active vibration isolation effect based on the pressure control of the pressure receiving chamber by the vibration displacement of the vibration plate.

  By the way, in order to advantageously obtain a passive vibration isolation effect based on the resonance action of the fluid flowing through the orifice passage, it is effective to obtain a large amount of fluid flowing through the orifice passage. is there. Here, as a means of ensuring a large amount of fluid flow easily, it is conceivable to increase the flow passage cross-sectional area of the orifice passage. In order to increase the channel cross-sectional area without greatly changing the frequency region that exhibits the anti-vibration effect, the channel length of the channel is increased as the channel cross-sectional area is increased. Extension is necessary.

  In order to realize such extension of the flow path length, for example, as shown in FIG. 5 of Patent Document 2 (Japanese Patent Laid-Open No. 2004-301193), the orifice passage is provided with an active fluid-filled vibration proof. It has been proposed to connect the upper and lower orifice passages in series as a two-stage stack in the axial direction of the apparatus. This makes it possible to increase the length of the orifice passage relatively easily.

  However, when such a two-stage stacked orifice passage is employed in an active fluid-filled vibration isolator, there is a possibility that an increase in the size of the device in the axial direction becomes a problem. That is, in an active fluid-filled vibration isolator, a vibration means is often disposed at the lower part in the axial direction, and in particular, an active type of a type having an equilibrium chamber above a pressure receiving chamber with a rubber elastic body interposed therebetween. In the type fluid-filled vibration isolator, if the orifice passages are stacked in two stages in the axial direction, there is a possibility that the whole apparatus is directly increased in size.

  On the other hand, it is conceivable that the orifice passages are overlapped in the radial direction and connected in series. However, according to the arrangement of the orifice passages, an increase in size in the axial direction can be avoided, while the size in the direction perpendicular to the axis can be avoided. As a result, the size of the entire apparatus may increase.

  Here, in particular, when an active fluid-filled vibration isolator is used as an engine mount for an automobile, in order to meet the demand for downsizing the engine mount, etc. in the recent vehicle layout, the orifice passage must be expanded. It is extremely difficult to allow an increase in the size of the active fluid-filled vibration isolator, and the vibration-proof performance of the active fluid-filled vibration isolator can be improved by increasing the channel length and cross-sectional area of the orifice passage. It was virtually impossible to realize.

  Furthermore, in order to realize an overlapped orifice passage without increasing the external dimensions of the active vibration isolator, the orifice passage is formed so as to overlap the orifice passage formed so far, If the orifice passages are connected in series, the inner orifice passage is located in the pressure receiving chamber, the amount of liquid in the pressure receiving chamber is reduced, and the fluid discharge efficiency is reduced when vibration is input. In particular, the amount of fluid allowed to flow through the orifice passage cannot be secured sufficiently, and it may be difficult to improve the vibration isolation performance.

JP 2002-188777 A JP 2004-301193 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the cross section of the orifice passage and the passage length are reduced without significantly increasing the device size. An object of the present invention is to provide an active fluid-filled vibration isolator having a novel structure that can be advantageously secured to effectively improve the vibration isolation performance.

  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 active fluid-filled vibration isolator according to the first aspect of the present invention is configured to fix the first attachment member to the small-diameter side end of the substantially truncated cone-shaped main rubber elastic body and to the large-diameter side end. A second attachment member having a substantially cylindrical shape is fixed to the first attachment member, and one opening in the axial direction of the second attachment member is fluid-tightly closed by the main rubber elastic body, while the shaft of the second attachment member is A vibration member is disposed in the other opening in the direction, and the vibration member is elastically supported by the support rubber elastic body with respect to the second mounting member, and the other opening in the axial direction of the second mounting member. By closing the fluid tightly, a main liquid chamber in which an incompressible fluid is sealed is formed between the opposing surfaces of the main rubber elastic body and the vibration member, and the actuator is supported by the second mounting member. The actuator can apply a driving force to the vibrating member to control the pressure of the main liquid chamber. A thin annular flexible rubber film is disposed on the outer side of the main rubber elastic body, and the inner peripheral edge and the outer peripheral edge of the flexible rubber film are disposed on the first mounting member and the first By fixing each of the two mounting members in a fluid-tight manner, a sub liquid chamber is formed on the opposite side of the main liquid chamber with the main rubber elastic body interposed therebetween, and the main liquid chamber and the sub liquid chamber are separated from each other. In the active fluid-filled vibration isolator having orifice passages connected to each other, a first annular fixing member is vulcanized and bonded to the outer peripheral surface of the large-diameter side end of the main rubber elastic body. By fixing the fixing member to the second mounting member, the large-diameter side end of the main rubber elastic body is fixed to the second mounting member, and the outer peripheral edge of the supporting rubber elastic body is Vulcanizing and bonding two annular fixing members to fix the second annular fixing member to the second mounting member; Further, the outer peripheral edge portion of the support rubber elastic body is fixed to the second mounting member, and the first annular flow path extending in a predetermined length in the circumferential direction is formed using the first annular fixing member. And forming a second annular channel extending in a circumferential direction by using the second annular fixing member, and connecting the first annular channel and the second annular channel in series. The orifice passage is formed by connecting the main liquid chamber and the sub liquid chamber to each other.

  In such an active fluid-filled vibration isolator having the structure according to this aspect, the first annular flow path formed using the first annular fixing member and the second annular fixing member are used. By connecting the second annular flow passages formed in series, the length of the orifice passage can be advantageously realized while avoiding an increase in the size of the entire apparatus. Therefore, since the channel cross-sectional area can be secured large without changing the tuning frequency of the orifice passage in which the frequency range to be tuned is set by the ratio of the passage length and the passage cross-sectional area, the fluid that flows through the orifice passage Can be advantageously obtained, and an anti-vibration effect based on the resonance action of the fluid flowing through the orifice passage can be improved.

  Furthermore, since it is possible to ensure a sufficiently long passage length of the orifice passage, it is possible to set a frequency range in which the vibration isolation effect by the orifice passage is effectively exhibited with a high degree of freedom. Tuning of the orifice passage according to the characteristics is advantageously realized, and the vibration isolation performance can be effectively exhibited.

  Further, a second aspect of the present invention is the active fluid-filled vibration isolator according to the first aspect, wherein the main rubber elastic body and the main rubber elastic body between the opposing surfaces of the vibration member, A pressure receiving member in which a partition member extending substantially orthogonal to the opposing direction of the vibrating member is disposed, and the main liquid chamber is partitioned by the partition member, so that a part of the wall portion is configured by the main rubber elastic body. The chamber and a part of the wall form a vibration chamber composed of the vibration member, and the partition member forms a communication path that allows the pressure receiving chamber and the vibration chamber to communicate with each other. The outer peripheral edge of the member is overlapped and fixed on the second annular fixing member, and the second annular flow path is formed between the overlapping surfaces of the partition member and the second annular fixing member. Features.

  In such an active fluid-filled vibration isolator having the structure according to this aspect, the main liquid chamber is divided into a pressure receiving chamber in which a part of the wall portion is constituted by a main rubber elastic body, and a wall portion by a vibration plate. The vibration plate should be vibration-proofed in order to obtain an active vibration-proofing effect by dividing the pressure-receiving chamber and the vibration-exciting chamber into each other through a communication path. Pressure fluctuations generated in the vibration chamber by driving in the frequency range can be efficiently transmitted to the pressure receiving chamber by the fluid flow through the communication path generated along with the displacement of the movable plate.

  In addition, by appropriately setting the passage length and the passage cross-sectional area of the communication passage, a filter effect using the anti-resonant action of the fluid flowing through the communication passage can be exhibited. That is, even when a pressure fluctuation of a higher-order component or a high-frequency component is induced in the vibration chamber, the pressure fluctuation of a frequency component that does not correspond to the vibration frequency to be vibrated is transmitted from the vibration chamber to the pressure receiving chamber. This can be suppressed by the filter effect. Therefore, in the main liquid chamber consisting of the pressure receiving chamber and the vibration chamber, it is possible to perform pressure control corresponding to the frequency and waveform of the vibration to be vibrated, and the active vibration damping effect is effective. It can be demonstrated.

  According to a third aspect of the present invention, in the active fluid-filled vibration isolator according to the first or second aspect, a substantially cylindrical outer cylinder member is provided on the outer peripheral edge of the flexible rubber film. The outer cylinder member is externally fitted to the first annular fixing member by vulcanization bonding, while a substantially cylindrical bracket member is employed to externally fit the bracket member to the second annular fixing member. The second mounting member is configured by overlapping the outer cylinder member in the axial direction and caulking and fixing the outer cylinder member and the bracket member to each other at one opening edge portion in each axial direction. The first annular fixing member and the second annular fixing member are caulked and fixed to the second mounting member at a caulking fixing site.

  According to a fourth aspect of the present invention, in the active fluid-filled vibration isolator according to any one of the first to third aspects, the first annular fixing member and the second annular fixing member are The first annular flow channel is disposed substantially coaxially, and is more outward than the second annular flow channel in a direction perpendicular to the central axis of the first annular fixing member and the second annular fixing member. And the first annular flow channel and the second annular flow channel are positioned so as to overlap each other in the projection perpendicular to the central axis.

  In such an active fluid-filled vibration isolator having a structure according to this aspect, the outer peripheral surface of the large-diameter side end of the main rubber elastic body having a relatively large diameter according to the performance required for durability or the like is provided. The dimensional difference in the radial direction between the first annular fixing member to be fixed and the second annular fixing member to be fixed to the outer peripheral edge portion of the supporting rubber elastic body having a relatively small diameter in order to prevent hydraulic pressure absorption. The first annular flow path formed using the first annular fixing member is more perpendicular to the central axis than the second annular flow path formed using the second annular fixing member. The first annular channel and the second annular channel are formed so as to extend in the circumferential direction on the outer side so that the formation positions of the first annular channel and the second annular channel overlap in the projection perpendicular to the central axis. Thus, by making effective use of the space in the active fluid-filled vibration isolator and effectively utilizing the space, the passage length of the orifice passage can be reduced without causing an increase in size in the central axis direction and the direction perpendicular to the central axis. Can be secured for a long time.

  As is clear from the above description, in the active fluid filled type vibration damping device constructed according to the present invention, the length of the orifice passage can be advantageously ensured and can be made to flow through the orifice passage. It is possible to advantageously realize an effect such as an improvement in the vibration isolation effect based on the resonance action of the fluid and a wide degree of freedom in a frequency range in which the orifice passage is tuned without causing an increase in the size of the apparatus.

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

  First, FIG. 1 shows an automotive engine mount 10 as a first embodiment of the present invention relating to an active vibration isolator. 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. The first mounting bracket 12 is attached to a power unit of an automobile (not shown), while the second mounting bracket 14 is attached to a body of an automobile (not shown), thereby supporting the power unit against vibration against the body. ing. Also, under such a mounted state, between the first mounting bracket 12 and the second mounting bracket 14, the load shared by the power unit and the main vibration to be damped are both substantially the axis of the engine mount 10. It is input in the direction (vertical direction in FIG. 1). In the following description, in principle, the vertical direction refers to the vertical direction in FIG.

  More specifically, the first mounting bracket 12 is constituted by a main rubber inner bracket 18 and a diaphragm inner bracket 20, and the second mounting bracket 14 is described later with a diaphragm outer cylinder bracket 24 as an outer cylinder member. It is comprised by the cylindrical bracket 142 as a bracket member. A main rubber inner metal fitting 18 and a main rubber outer cylinder fitting 22 as a first annular fixing member are vulcanized and bonded to the main rubber elastic body 16 to form a first integral vulcanized molded product 26, while a diaphragm is provided. The inner metal fitting 20 and the diaphragm outer cylinder metal fitting 24 are vulcanized and bonded to a diaphragm 28 as a flexible rubber film to form a second integral vulcanized molded product 30. The vulcanized molded products 26 and 30 are combined with each other.

  Here, the main rubber inner metal fitting 18 constituting the first integrally vulcanized molded product 26 has a substantially truncated cone shape in the reverse direction. Further, a fitting recess 32 is formed on the upper end surface (large-diameter side end surface) of the main rubber inner metal fitting 18, and a screw hole 34 is formed in the bottom surface of the fitting recess 32.

  Furthermore, the main rubber outer cylinder fitting 22 includes a cylindrical wall portion 36 having a substantially large-diameter cylindrical shape, and a flange-shaped portion 38 that extends radially outward at the lower end in the axial direction of the cylindrical wall portion 36. Are integrally formed, and an upper end portion in the axial direction of the cylindrical wall portion 36 is a tapered cylindrical portion 40 that gradually expands in the axial direction. As a result, a first circumferential groove 42 is formed on the outer circumferential side of the main rubber outer tube fitting 22 so as to open to the outer circumferential surface and extend in the circumferential direction with a length of a little less than one round. Further, the main rubber inner metal fitting 18 is spaced apart on the substantially same central axis so as to be spaced above the main rubber outer cylinder fitting 22, and the reverse outer tapered outer surface of the main rubber inner metal fitting 18 and the taper in the main rubber outer cylinder fitting 22. The inner peripheral surface of the cylindrical portion 40 is spaced from and opposed to each other, and the opposing surfaces of the main rubber inner metal fitting 18 and the main rubber outer cylinder metal fitting 22 are elastically connected by the main rubber elastic body 16. ing.

  The main rubber elastic body 16 has a large truncated cone shape as a whole, and a slope 44 extending substantially linearly in the axial direction is formed with respect to a part of the tapered outer peripheral surface. The central rubber inner metal fitting 18 is coaxially arranged and vulcanized and bonded to the central portion thereof, and the tapered cylindrical portion 40 of the main rubber outer cylindrical metal fitting 22 is attached to the outer peripheral surface of the large diameter side end portion. Overlaid and vulcanized and bonded. As a result, the main rubber elastic body 16 is formed as a first integral vulcanized molded product 26 including the main rubber inner metal fitting 18 and the main rubber outer cylinder fitting 22 as described above.

  On the other hand, the diaphragm inner metal fitting 20 constituting the second integrally vulcanized molded product 30 has a thick disk shape. In addition, a fitting convex portion 46 is formed on the lower surface of the diaphragm inner metal member 20, and an insertion hole 48 is formed so as to penetrate the forming portion of the fitting convex portion 46. Further, the diaphragm inner fitting 20 is integrally formed with a mounting plate portion 50 protruding upward, and a bolt insertion hole 52 is provided at the central portion of the mounting plate portion 50.

  Further, the diaphragm outer tube fitting 24 has a thin-walled and large-diameter cylindrical shape, and a mounting plate portion 54 that extends radially outward is integrally formed in the axially upper opening portion. . The mounting plate portion 54 is formed with a plurality of insertion holes, and fixing bolts 56 are respectively implanted in the insertion holes. Furthermore, an annular plate-shaped flange-shaped portion 58 that extends outward in the radial direction is integrally formed in the axially lower opening of the diaphragm outer tube fitting 24. An annular caulking piece 60 that projects downward in the axial direction is integrally formed on the outer peripheral edge.

  A diaphragm inner fitting 20 is disposed on substantially the same central axis so as to be spaced apart upward in the axial direction of the diaphragm outer tubular fitting 24, and the diaphragm inner fitting 20 and the diaphragm outer tubular fitting 24 are separated by a diaphragm 28. It is connected.

  The diaphragm 28 is formed of a thin rubber film and has a substantially annular shape extending in the circumferential direction with a curved cross-sectional shape having a large slack so that elastic deformation can be easily allowed. The inner peripheral edge portion of the diaphragm 28 is vulcanized and bonded to the outer peripheral edge portion of the diaphragm inner metal fitting 20, and the outer peripheral edge portion of the diaphragm 28 is in an opening portion on the upper side in the axial direction of the diaphragm outer cylindrical metal fitting 24. It is vulcanized and bonded. Thus, the diaphragm 28 is formed as a second integral vulcanized molded product 30 including the diaphragm inner fitting 20 and the diaphragm outer tubular fitting 24.

  Thus, the second integral vulcanized molded product 30 is assembled with the above-mentioned first integral vulcanized molded product 26 from above, and the diaphragm inner metal fitting 20 is attached to the main rubber inner metal fitting 18. The diaphragm outer cylinder fitting 24 is fixed to the main rubber outer cylinder fitting 22, and the diaphragm 28 is spaced outward from the main rubber elastic body 16, so that the outer peripheral surface of the main rubber elastic body 16 is fixed. Is disposed so as to cover the entire surface.

  That is, the diaphragm inner metal fitting 20 is directly overlaid on the upper surface of the main rubber inner metal fitting 18, and the fitting convex portion 46 of the diaphragm inner metal fitting 20 is fitted into the fitting concave portion 32 of the main rubber inner metal fitting 18. And the main rubber inner metal fitting 18 are aligned on the same central axis. Particularly in the present embodiment, the diaphragm inner metal fitting is obtained by the engaging action of the engaging outer peripheral surface 62 and the engaging inner peripheral surface 64 formed in a notch shape on the outer peripheral surfaces of the fitting convex portion 46 and the fitting concave portion 32. 20 and the main rubber inner fitting 18 are positioned relative to each other in the circumferential direction, and the insertion hole 48 of the diaphragm inner fitting 20 and the screw hole 34 of the main rubber inner fitting 18 are aligned.

  As shown in FIG. 1, in a state where the main rubber inner metal fitting 18 and the diaphragm inner metal fitting 20 are overlapped, the connecting bolt 66 passes through the insertion hole 48 of the diaphragm inner metal fitting 20, and the screw hole of the main rubber inner metal fitting 18. 34 is screwed. Thus, the main mounting bracket 12 is configured by connecting and fixing the main rubber inner metal fitting 18 and the diaphragm inner metal fitting 20 with the connecting bolt 66.

  On the other hand, the diaphragm outer tubular fitting 24 is externally inserted from the upper side in the axial direction with respect to the main rubber outer tubular fitting 22. Further, the outer peripheral edge of the flange-like portion 38 is overlapped in the axial direction with respect to the flange-like portion 58 of the diaphragm outer tubular fitting 24 at the lower end portion of the main rubber outer tubular fitting 22, and The opening end edge portion of the tapered tubular portion 40 is overlapped with the inner peripheral surface of the diaphragm outer tubular fitting 24 in the radial direction.

  Then, the caulking piece 60 of the diaphragm outer cylinder fitting 24 is caulked and fixed to the outer peripheral edge of the flange-shaped portion 38 of the main rubber outer cylinder fitting 22, whereby the main rubber outer cylinder fitting 22 and the diaphragm outer cylinder fitting 24 are mutually connected. The large-diameter side end of the main rubber elastic body 16 is fixed to the second mounting bracket 14 via the main rubber outer cylinder fitting 22.

  Further, a lid member 68 is assembled in the lower opening of the main rubber outer cylinder fitting 22. The lid member 68 has an annular holding bracket 72 as a second annular fixing member vulcanized and bonded to the outer circumferential portion of the substantially annular plate-shaped support rubber elastic body 70, and is added to the central portion thereof. A vibration plate 74 as a vibration member is vulcanized and bonded, and the vibration plate 74 and the annular holding fitting 72 are elastically connected by a support rubber elastic body 70.

  The annular holding fitting 72 is integrally formed with an annular press-fit portion 78 projecting downward on the outer peripheral edge portion of the mounting plate portion 76 having a substantially annular plate shape, and on the inner peripheral edge portion of the mounting plate portion 76. Is integrally formed with a groove-like portion 80 extending in the circumferential direction with a predetermined length of a little less than one round. The groove-shaped portion 80 includes an outer peripheral side wall portion 82, a bottom wall portion 84, and an inner peripheral side wall portion 86. The outer peripheral side wall portion 82 is formed so as to extend downward from the inner peripheral edge portion of the mounting plate portion 76 and has a substantially cylindrical shape. Further, the bottom wall portion 84 has a substantially annular plate shape that extends in a direction substantially perpendicular to the axis from the lower end edge of the outer peripheral side wall portion 82 toward the radially inner peripheral side. Further, a substantially cylindrical inner peripheral side wall 86 protruding upward in the axial direction is integrally formed at the inner peripheral end of the bottom wall 84. As a result, a second circumferential groove 88 is formed in the groove-shaped portion 80 so as to open upward in the axial direction and extend in the circumferential direction with a predetermined length of slightly less than one round. In the present embodiment, the grooved portion 80 and the press-fit portion 78 can be advantageously formed in the annular holding fitting 72 by pressing a substantially annular metal plate.

  On the other hand, the vibration plate 74 has a disk shape, and an annular connecting portion 90 that protrudes upward is integrally formed on the outer peripheral edge thereof. In addition, a drive shaft 92 as a connecting rod extending downward is integrally formed at the central portion of the vibration plate 74. The vibration plate 74 includes the annular connecting portion 90 and the drive shaft 92, and is integrally formed of a hard material such as metal or synthetic resin.

  A vibration plate 74 is disposed on substantially the same central axis so as to be spaced inward in the radial direction of the annular holding fitting 72, and spreads between the radially opposed surfaces of the annular holding fitting 72 and the vibration plate 74. Thus, the support rubber elastic body 70 is disposed. Further, the supporting rubber elastic body 70 is vulcanized and bonded to the opposing surfaces of the annular connecting portion 90 of the vibration plate 74 and the groove-shaped portion 80 of the annular holding bracket 72 at the inner and outer peripheral edge portions. A space between the plate 74 and the annular holding fitting 72 is fluid-tightly closed by a support rubber elastic body 70. Note that the second circumferential groove 88 is covered over substantially the entire surface with a seal rubber formed integrally with the support rubber elastic body 70.

  On the other hand, the drive shaft 92 constituting the vibration plate 74 is connected to an electromagnetic exciter 94 as an actuator disposed below the lid member 68 in the axial direction (lower in FIG. 1). The electromagnetic exciter 94 includes a substantially cup-shaped housing 96 in which a coil 98 is fixedly assembled in an accommodated state, and upper and lower yokes each made of an annular ferromagnetic material are disposed around the coil 98. 100 and 102 are fixedly assembled to form a magnetic path. A guide sleeve 104 is elastically positioned and mounted on the inner peripheral surface of the upper yoke 100 that forms the magnetic path. A slider 106 made of a ferromagnetic material as an armature is assembled so as to be slidable in the guide sleeve 104.

  A housing 96 having a substantially bottomed cylindrical shape has upper and lower yokes 100, 102 fixedly accommodated at the bottom thereof, and has an opening extending a predetermined length above the upper end of the upper yoke 100. Yes. An annular mounting flange portion 108 that extends outward in the radial direction is integrally formed in the opening portion of the housing 96. Further, the inner diameter of the opening of the housing 96 is slightly larger than the outer diameter of the outer peripheral side wall 82 of the annular holding fitting 72. Furthermore, the outer diameter of the mounting flange portion 108 of the housing 96 is made smaller than the inner diameter of the press-fit portion 78 of the annular holding metal fitting 72.

  The slider 106 has a substantially cylindrical shape as a whole, is slidable on the guide sleeve 104 on the outer peripheral surface, and is disposed in a magnetic gap region formed between the upper and lower yokes 100 and 102. A magnetic force is applied by energizing the coil 98, and it is driven in the axial direction while being guided by the guide sleeve 104. Further, the slider 106 has a substantially cylindrical shape as a whole having an insertion hole 110 extending in the axial direction, and is slidable on the guide sleeve 104 on the outer peripheral surface, while the inner peripheral surface has an annular shape. The engaging protrusion 112 is formed so as to protrude inward.

  The drive shaft 92 of the vibration plate 74 inserted from above on the central axis of the electromagnetic exciter 94 is inserted into the engagement protrusion 112 of the slider 106 and the drive shaft 92 is engaged. A positioning nut 114 as a positioning member is screwed to the tip portion inserted through the protrusion 112, and the slider 106 is supported so as not to come out of the drive shaft 92. Further, a coil spring 116 as an urging means is extrapolated on the drive shaft 92 and is disposed across the opposing surfaces of the vibration plate 74 and the engaging projection 112 of the slider 106. That is, the positioning nut 114 is screwed into the drive shaft 92 and the coil spring 116 is compressed between the vibrating plate 74 and the vibration plate 74 via the engaging projection 112 of the slider 106, so that the slider 106 is moved by the coil spring 116. It is supported so that it cannot escape. Thereby, the slider 106 is fixedly positioned in the axial direction with respect to the drive shaft 92.

  In the present embodiment, collar members 118 are attached to both ends of the coil spring 116 to reduce wear due to friction between the coil spring 116 and other members. Thus, the drive shaft 92 and the slider 106 are connected in a substantially fixed state in the axial direction by the urging force of the coil spring 116, and the driving force applied to the slider 106 by energizing the coil 98 is driven. The shaft 92 is extended.

  Further, the positioning nut 114 is formed with a concave groove 120 that extends continuously in the radial direction on the surface of the slider 106 overlapped with the engaging protrusion 112. With the concave groove 120, a communication path is formed by the concave groove 120 between the overlapping surfaces of the positioning nut 114 and the engaging projection 112 of the slider 106 in a state where the positioning nut 114 is attached to the drive shaft 92. The upper and lower spaces of the slider 106 are maintained in communication with each other through the communication passage, and the influence of the air spring in the sealed space is avoided.

  Note that a slight gap is formed between the outer peripheral edge of the positioning nut 114 and the facing surface of the slider 106, and the slider 106 is allowed to slide in a direction perpendicular to the drive shaft 92. Thus, the positioning nut 114 is overlaid and held in contact. Thereby, the relative displacement between the drive shaft 92 and the slider 106 due to a dimensional error in manufacturing of each member or a positioning error at the time of assembly can be advantageously absorbed, and the slider 106 can be coiled. 98 can be stably positioned in the direction perpendicular to the axis. Further, the temporary axis deviation during the operation of the actuator is also advantageously absorbed, so that stable operation characteristics can be obtained. In addition, as an allowable amount of the relative displacement in the direction perpendicular to the axis, a range of 0.2 mm to 3 mm is preferably employed.

  A through hole 122 is provided in the center of the bottom wall portion of the housing 96 of the electromagnetic exciter 94, and the lower yoke 102 that exerts a magnetic force is exposed to the outside so as to be opposed to the slider 106. ing. Then, a tool such as a hexagon wrench is inserted into the center hole 124 of the slider 106 through the through-hole 122 and the positioning nut 114 or the lock bolt 126 tightened in the center of the positioning nut 114 is operated, whereby the slider 106 is operated. The position relative to the drive shaft 92 can be adjusted from the outside.

  In addition, the axially lower opening of the center hole 128 of the lower yoke 102 exposed to the outside through the through hole 122 of the housing 96 has a mounting opening 130 formed of a plurality of grooves extending continuously in the circumferential direction. The lid plate member 132 is disposed with respect to the attachment port 130. The cover plate member 132 has a structure in which a rubber layer 136 is attached to the surface of a hard base plate 134, and is fitted into the attachment port 130, and is engaged with the end portion of the attachment port 130 using elasticity. It is detachably attached to the attachment port 130 by being supported by the combined flat spring 138 having a C-shape in plan view. As a result, the center hole 128 of the lower yoke 102 is fluid-tightly covered with the base plate 134 with the rubber layer 136 interposed therebetween. Further, since the rubber layer 136 is opposed to the front end surface of the drive shaft 92 of the vibration plate 74 at a predetermined distance in the axial direction, the first mounting bracket 12 and the second mounting bracket 14 are arranged. When the driving shaft 92 is brought into contact with the lid plate member 132 when a large vibration load is input during the period, the tip of the driving shaft 92 is brought into contact with the base plate 134 via the rubber layer 136. The displacement amount of the vibration plate 74 is limited in a buffering manner.

  Further, the central portion of the lower yoke 102 is a central protrusion 140 that is thick in a mountain shape, and the central protrusion 140 enters the guide sleeve 104 from below.

  The lower yoke 102 is magnetically connected to the housing 96 and the upper yoke 100, and forms an annular magnetic path extending around the coil 98 in cooperation with the housing 96 and the upper yoke 100. is doing. In addition, in this magnetic path, a magnetic gap is formed between the upper yoke 100 and the lower yoke 102 in the central hole of the coil 98, and a slider 106, which is an armature, is located at a position corresponding to the magnetic gap. It is arranged. The slider 106 is positioned on the inner peripheral side of the upper yoke 100 with the guide sleeve 104 interposed therebetween, and is spaced apart from the lower yoke 102 by a predetermined distance.

  As a result, when the coil 98 wound in the circumferential direction is energized, a magnetic pole is formed between the opposing surfaces of the upper and lower yokes 100 and 102 forming the magnetic gap. A driving force in the direction of minimizing the magnetic resistance, that is, an axial driving force toward the lower yoke 102 is applied to the slider 106 arranged in the magnetic gap. is there. Based on the driving force exerted on the slider 106, the vibration driving force in the axial direction is exerted on the vibration plate 74.

  Furthermore, a cylindrical bracket 142 as a bracket member is disposed so as to surround the radially outer side of the electromagnetic exciter 94. The tubular bracket 142 has a substantially cylindrical shape as a whole, and an upper flange 144 that extends outwardly in the radial direction is integrally formed at one opening (upper in FIG. 1) in the axial direction. In addition, the other side in the axial direction (the lower side in FIG. 1) is a tapered leg portion 146 that is gradually expanded as it goes downward in the axial direction. In the present embodiment, the second bracket 14 is fixed to the vehicle body side by attaching the cylindrical bracket 142 to the vehicle body side by bolting or the like.

  The lid member 68, the electromagnetic vibrator 94, and the cylindrical bracket 142 are all caulked and fixed by the caulking piece 60 of the diaphragm outer tube fitting 24. That is, the mounting plate portion 76 and the press-fit portion 78 in the annular holding fitting 72 of the lid member 68, the mounting flange portion 108 in the housing 96 of the electromagnetic exciter 94, and the upper flange 144 in the cylindrical bracket 142 are overlapped in the axial direction. In addition, the main body rubber outer cylinder is superposed from the lower side in the axial direction on the flange-like portion 38 of the main rubber outer cylinder metal fitting 22 superposed on the flange-like part 58 of the diaphragm outer cylindrical metal fitting 24 from below in the axial direction. A state in which the flange-shaped portion 38 of the metal fitting 22, the mounting plate portion 76 and the press-fit portion 78 of the lid member 68, the mounting flange portion 108 of the electromagnetic exciter 94, and the upper flange 144 of the cylindrical bracket 142 are overlapped in the axial direction. The caulking piece 60 formed integrally with the diaphragm outer tube bracket 24 is fixed by caulking. Ri, cover member 68 and the electromagnetic vibrator 94 and the tubular bracket 142 is attached to the diaphragm outer tubular fitting 24. Thereby, the second mounting bracket 14 in the present embodiment is constituted by the diaphragm outer cylindrical bracket 24 and the cylindrical bracket 142. Further, under such an attached state, the annular holding fitting 72 in the present embodiment is disposed substantially coaxially with the main rubber outer tube fitting 22. In this embodiment, arranging a plurality of members coaxially means that the plurality of members are arranged so as to have substantially the same central axis, and in the projection in a direction perpendicular to the axis with respect to the central axis, It shall be arranged that at least a part of these members are arranged to overlap each other.

  As a result, the lower opening of the diaphragm outer tube fitting 24 is covered with the lid member 68 in a fluid-tight manner, so that an incompressible fluid is interposed between the opposing surfaces of the main rubber elastic body 16 and the lid member 68. A pressure fluctuation working chamber 148 is formed as a sealed main liquid chamber. A part of the wall of the pressure fluctuation working chamber 148 is composed of the main rubber elastic body 16, and the main rubber elastic body 16 is input when vibration is input between the first mounting bracket 12 and the second mounting bracket 14. The vibration is input based on the elastic deformation of the pressure to cause the pressure fluctuation.

  The main rubber elastic body 16 and the diaphragm 28 are fixed to the first mounting bracket 12 and the second mounting bracket 14 at the inner peripheral edge and the outer peripheral edge, respectively, so that the main rubber elastic body 16 and the diaphragm 28 are fixed. An equilibration chamber 150 as a secondary liquid chamber in which an incompressible fluid is sealed is formed between the opposing surfaces. That is, the equilibration chamber 150 is configured by the diaphragm 28 having a part of the wall portion that is easily deformable, and the volume change is easily allowed based on the elastic deformation of the diaphragm 28.

  As the incompressible fluid sealed in the pressure fluctuation working chamber 148 and the equilibrium chamber 150, the engine mount 10 for automobiles is required to have an anti-vibration effect based on the resonance action of the fluid flowing through the orifice passage 182 described later. In general, 0.1 Pa. A low-viscosity fluid of s or less is preferably employed.

  On the other hand, a partition plate fitting 152 as a partition member is disposed in the pressure fluctuation working chamber 148. The partition plate fitting 152 has a thick, substantially disk shape extending in the direction perpendicular to the axis, and the outer diameter of the partition plate fitting 152 is such that the outer peripheral side wall 82 of the annular holding fitting 72 extends to the outside in the radial direction. Yes. The outer peripheral portion in the radial direction is superimposed on the upper surface of the annular holding fitting 72, and the partition plate fitting 152 is disposed above the lid member 68 with the substantially same central axis as the lid member 68. In addition, a substantially inverted mortar-shaped central recess 154 is formed in the center portion of the lower surface of the partition plate fitting 152, and the thin portion in which the central portion in the radial direction of the partition plate fitting 152 is thinner than the outer peripheral portion. 156. The thin portion 156 formed in the central portion in the radial direction of the partition plate metal member 152 is positioned above the vibration plate 74 by the central recess 154. In addition, orifice thin holes 158 as a plurality of communication passages are provided in the thin wall portion 156 of the partition plate fitting 152 in the axial direction. Further, a lid groove 160 is formed in the outer peripheral portion of the lower surface of the partition plate fitting 152 so as to open downward in the axial direction and extend with a predetermined length of slightly less than one round in the circumferential direction. Furthermore, a thin annular plate-shaped fixing flange portion 162 that extends radially outward from the lower end portion thereof is integrally formed on the outer peripheral surface of the partition plate fitting 152 over substantially the entire circumference.

  The outer peripheral portion of the partition plate fitting 152 is superimposed on the upper surface of the lid member 68, while the fixed flange portion is provided between the flange-like portion 38 of the main rubber outer tubular fitting 22 and the mounting plate portion 76 of the lid member 68. 162 is clamped and held, and the outer peripheral surface is radially overlapped with the tubular wall portion 36 of the main rubber outer tubular fitting 22 via a seal rubber, thereby spreading in the direction perpendicular to the axis within the pressure fluctuation working chamber 148. It is attached as follows. As a result, the pressure fluctuation working chamber 148 is divided into two parts up and down across the partition plate fitting 152 in the central portion in the radial direction, and one side (upper in FIG. 1) of the wall portion is sandwiched across the partition plate fitting 152. The portion is composed of the main rubber elastic body 16 and serves as a pressure receiving chamber 164 in which pressure fluctuation is caused when vibration is input, and the other side (lower in FIG. 1) is a part of the wall portion with the lid member 68. The excitation chamber 166 is configured so that the excitation force from the electromagnetic exciter 94 is applied. A stopper rubber 168 is formed in the vicinity of the annular connecting portion 90 of the vibration plate 74 so as to cover the annular connecting portion 90, and the amount of movement of the vibration plate 74 in the approaching direction to the partition plate fitting 152 is reduced. In addition to being limited in terms of buffering, impact and hitting sound at the time of contact are reduced.

  Further, the pressure receiving chamber 164 and the vibration chamber 166 are connected to each other through an orifice through hole 158 formed in the thin wall portion 156 of the partition plate fitting 152, and another part of the wall portion of the vibration chamber 166. The excitation force generated by the displacement and displacement of the lid member 68 that constitutes the electromagnetic exciter 94 is exerted on the pressure receiving chamber 164 through the orifice through hole 158.

  In particular, in the present embodiment, since the diameter of the orifice through hole 158 and the thickness dimension of the thin wall portion 156 are appropriately set, the resonance frequency of the fluid that flows through the orifice through hole 158 has an active vibration isolation effect. In order to obtain an active vibration isolation effect, the vibration chamber 74 is vibrated and driven in a vibration frequency region to be vibration-isolated. The pressure fluctuation generated in 166 is efficiently transmitted to the pressure receiving chamber 164 by the fluid flow through the orifice through hole 158. In addition, when pressure fluctuations of higher-order components or high-frequency components are induced in the vibration chamber 166, the orifice through hole 158 is substantially blocked by the antiresonant action of the fluid, and such vibration isolation is performed. It is possible to suppress the pressure fluctuation of the frequency component higher than the vibration frequency to be transmitted from the excitation chamber 166 to the pressure receiving chamber 164.

  Further, the outer peripheral edge portion of the flange-shaped portion 38 in the main rubber outer tubular fitting 22 is overlapped in the axial direction with respect to the flange-shaped portion 58 of the diaphragm outer tubular fitting 24, and the opening of the tapered tubular portion 40 at the upper end portion thereof. End edges are overlapped in the radial direction with respect to the inner peripheral surface of the diaphragm outer tube fitting 24, and seal rubber integrally formed with the main rubber elastic body 16 or the diaphragm 28 is respectively formed on these overlapping portions. Intervened and fluid tightly sealed. As a result, the first circumferential groove 42 formed in the main rubber outer cylinder fitting 22 is fluid-tightly covered with the diaphragm outer cylinder fitting 24, so that the cylinder wall portion 36 of the main rubber outer cylinder fitting 22 and the diaphragm outer cylinder fitting are provided. An outer annular flow path 170 is formed as a first annular flow path that extends continuously between the radially opposed surfaces of 24 in the circumferential direction with a predetermined length or over the entire circumference.

  Further, the opening of the lid groove 160 formed in the outer peripheral portion of the partition plate fitting 152 is aligned with the opening of the groove-like portion 80 of the annular holding fitting 72 in the radial direction, and is overlapped in the axial direction. Thus, the opening of the second circumferential groove 88 is fluid-tightly covered with the partition plate fitting 152. As a result, the inner side as the second annular flow path extending in the circumferential direction with a predetermined length of a little less than one turn between the groove-shaped portion 80 of the lid member 68 and the facing surface of the partition plate fitting 152 in the outer peripheral portion of the partition plate fitting 152. An annular channel 172 is formed.

  In the present embodiment, the outer annular channel 170 is formed radially outward of the inner annular channel 172, and is formed so that the outer annular channel 170 and the inner annular channel 172 overlap in the radial direction. ing. In the present embodiment, the outer annular flow path 170 and the inner annular flow path 172 are respectively formed by using the main rubber outer cylinder fitting 22 and the annular holding fitting 72 that are overlapped in the axial direction. The annular flow paths 170 and 172 are formed at positions shifted from each other in the axial direction. That is, the upper wall surface of the outer annular channel 170 is formed so as to be positioned higher in the axial direction than the upper wall surface of the inner annular channel 172, and the bottom wall surface of the outer annular channel 170 is the inner annular channel 172. The bottom wall surface of the outer annular channel 170 is formed so as to be positioned below the top wall surface of the inner annular channel 172 in the axial direction. ing.

  Here, between one end in the circumferential direction of the outer annular flow path 170 formed between the opposing surfaces of the main rubber outer cylinder fitting 22 and the diaphragm outer cylinder fitting 24 and the opposing faces in the outer circumference of the lid member 68 and the partition plate fitting 152. One end in the circumferential direction of the inner annular flow path 172 formed in the above is connected in series through a connection flow path 174 extending substantially linearly in the direction perpendicular to the axis, whereby the outer annular flow path 170 and the inner annular flow path 172 are connected in series. An annular flow path 176 configured to include the path 172 is formed.

  Further, one end of the annular channel 176 is connected to the pressure receiving chamber 164 through the communication hole 178. The communication hole 178 is formed in a part of the upper bottom wall of the lid groove 160 at a radial position where the lid groove 160 is formed on the lower surface of the partition plate metal 152, and opens to the upper surface of the partition plate metal 152. One end of the annular flow path 176 is communicated with the pressure receiving chamber 164.

  On the other hand, the other end of the annular channel 176 is connected to the equilibrium chamber 150 through the communication window 180. The communication window 180 is formed by cutting out a part of the tapered tubular portion 40 in the main rubber outer tubular fitting 22 constituting the axially upper wall surface of the annular flow path 176. The communication window 180 is connected to the lower end in the axial direction of the slope 44 formed on the tapered side wall surface of the main rubber elastic body 16, whereby the other end of the annular flow path 176 passes through the communication window 180 and the slope 44. Is communicated with the equilibrium chamber 150.

  As a result, the annular channel 176 connects the pressure receiving chamber 164 and the equilibrium chamber 150 to each other, and an orifice passage 182 that allows fluid flow between the chambers 158 and 144 is formed with a predetermined length. The orifice passage 182 has an anti-vibration effect based on a resonance action of a fluid that is caused to flow inside based on a pressure difference caused between the pressure receiving chamber 164 and the equilibrium chamber 150 when vibration is input. The passage cross-sectional area and the passage length are appropriately set and tuned so as to be effectively exhibited in the frequency range.

  In the automobile engine mount 10 having the structure according to this embodiment, the annular flow path 176 formed by connecting the outer annular flow path 170 and the inner annular flow path 172 in series through the connection flow path 174 is provided. An orifice passage 182 is formed. Therefore, the passage length of the orifice passage 182 can be made sufficiently long, and the tuning frequency of the orifice passage 182 determined by the ratio of the passage length of the orifice passage 182 and the passage sectional area can be set with a wide setting freedom. I can do it.

  Further, since the passage length of the orifice passage 182 can be secured sufficiently longer than that of the conventional engine mount, the passage cross-sectional area can be increased without changing the ratio of the passage length of the orifice passage 182 to the passage step area. Thus, it is possible to advantageously obtain the amount of fluid flowing through the orifice passage 182. Therefore, it is possible to effectively exhibit the vibration isolation effect based on the resonance action of the fluid that can flow through the orifice passage 182.

  In the present embodiment, the outer annular flow path 170 is formed including the main rubber outer cylinder fitting 194, and the inner annular flow path 172 is formed by the cooperation of the diaphragm outer cylinder fitting 24 and the partition plate fitting 152. The orifice passage 182 includes the outer annular channel 170 and the inner annular channel 172. Therefore, the orifice passage 182 is skillfully formed without newly providing a special member, and it is possible to avoid problems such as complicated manufacturing and an increase in cost due to an increase in the number of parts. In addition, problems such as an increase in the size of the apparatus can be advantageously avoided by using the existing members to form the orifice passage 182.

  Further, the partition plate metal fitting 152 constituting a part of the wall surface of the inner annular flow path 172 is positioned inwardly in the direction perpendicular to the axis of the main rubber elastic body 16 constituting the wall surface of the outer annular flow path 170. The channel 170 and the inner annular channel 172 are formed so as to overlap in the radial direction. Thereby, the orifice passage 182 can be advantageously downsized in the axial direction, and the enlargement of the entire apparatus in the axial direction accompanying the extension of the passage length of the orifice passage 182 can be effectively prevented.

  Moreover, the outer annular flow path 170 is formed by utilizing the main rubber outer tube fitting 22 fixed to the outer peripheral surface of the main rubber elastic body 16 formed so as to have a certain large rubber volume due to a demand for durability. In addition, in order to reduce absorption due to elastic deformation of pressure fluctuations induced in the pressure fluctuation working chamber 148 at the time of vibration input, the outside of the supporting rubber elastic body 70 formed so as to spread in a direction perpendicular to the axis with a relatively small diameter dimension. By forming the inner annular flow path 172 using the annular holding metal fitting 72 fixed to the peripheral edge portion, the outer annular flow path 170 and the inner annular flow path 172 can be easily moved in the radial direction without requiring a significant design change. The passages 68 and 156 can be formed so as to overlap each other in the radial direction.

  Further, by providing the partition plate fitting 152, the pressure fluctuation working chamber 148 is partitioned into the pressure receiving chamber 164 and the vibration chamber 166, and the pressure receiving chamber 164 and the vibration chamber 166 are communicated with each other through the orifice through hole 158. In addition, the orifice through hole 158 is tuned to the frequency of vibration to be damped. Therefore, pressure fluctuations generated in the vibration chamber 166 when the vibration plate 74 is vibrated and driven in the vibration frequency region to be vibrated are caused to enter the pressure receiving chamber 164 through the orifice through hole 158 by the resonance action of the fluid. On the other hand, the active vibration isolation effect can be effectively exhibited because the signal is transmitted positively.

  In addition, it is advantageously possible to suppress the transmission of high-order components and high-frequency components induced in the vibration chamber 166 to the pressure receiving chamber 164 by utilizing the antiresonant action of the fluid in the orifice passage hole 158. With this filter effect, it becomes possible to perform pressure control corresponding to the high frequency with respect to the frequency and waveform of vibration to be vibrated in the pressure fluctuation working chamber 148, and the active vibration isolating effect is effectively exhibited. It can be done.

  Next, FIG. 2 shows an automobile engine mount 184 as a second embodiment of the present invention relating to an active fluid-filled vibration isolator. The engine mount 184 has a structure in which a first mounting bracket 186 as a first mounting member and a second mounting bracket 188 as a second mounting member are elastically connected by a main rubber elastic body 16. The first mounting bracket 186 is attached to a vehicle power unit (not shown), while the second mounting bracket 188 is attached to a vehicle body (not shown), so that the power unit is supported against vibration against the body. ing. Also, under such a mounting state, between the first mounting bracket 186 and the second mounting bracket 188, the shared load of the power unit and the main vibration to be damped are both substantially the axis of the engine mount 184. It is input in the direction (vertical direction in FIG. 2). In the following description, the vertical direction means the vertical direction in FIG. 2 in principle. Moreover, in the following description, about the site | part or member substantially the same as said 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  More specifically, the first mounting bracket 186 is configured by a main rubber inner bracket 190 and a diaphragm inner bracket 192, and the second mounting bracket 188 is configured by a diaphragm outer cylinder bracket 196 as an outer cylinder member. ing. A main rubber inner metal fitting 190 and a main rubber outer tube metal fitting 194 as a first annular fixing member are vulcanized and bonded to the main rubber elastic body 16 to form a first integral vulcanized molded product 198, while the diaphragm The inner metal fitting 192 and the diaphragm outer tube metal fitting 196 are vulcanized and bonded to the diaphragm 28 as a flexible film to form the second integral vulcanized molded product 200. Sulfur moldings 198 and 200 are combined with each other.

  Here, the main rubber inner fitting 190 constituting the first integrally vulcanized molded product 198 has a substantially truncated cone shape in the reverse direction, and the radial direction of the upper end surface (large-diameter side end face) of the main rubber inner fitting 190. A thinning recess 202 is formed in a substantially central portion, while an outer peripheral edge portion of the upper end surface is a fitting stepped portion 204 over the entire circumference. That is, the lower part of the main rubber inner metal fitting 190 is a fixing part 206 having a substantially truncated cone shape in the reverse direction, and the upper part is a thick, substantially cylindrical shape whose diameter is smaller than the large-diameter end of the fixing part 206. It is set as the fitting part 208 which has.

  Furthermore, the main rubber outer tube fitting 194 includes a tube wall portion 210 having a substantially large-diameter cylindrical shape, and an upper end portion in the axial direction of the tube wall portion 210 gradually expands as it goes upward in the axial direction. A substantially annular plate-shaped flange-like portion 214 that extends outward in the direction perpendicular to the axis is integrally formed at the upper end edge of the tapered tubular portion 212. Further, the main rubber inner metal fitting 190 is spaced apart on substantially the same central axis so as to be spaced above the main rubber outer tube metal fitting 194, and the reversely tapered outer peripheral surface of the fixing portion 206 of the main rubber inner metal fitting 190 and the main rubber outer tube. The inner peripheral surface of the tapered cylindrical portion 212 in the metal fitting 194 is spaced apart from and opposed to each other, and the main rubber elastic body 16 provides elasticity between the opposed surfaces of the main rubber inner metal fitting 190 and the main rubber outer cylindrical metal fitting 194. Connected.

  On the other hand, the diaphragm inner metal fitting 192 constituting the second integral vulcanized molded product 200 has a thin and substantially annular shape, and its upper end is bent outward in the direction perpendicular to the axis.

  In addition, the diaphragm outer tubular metal fitting 196 is formed including a tubular portion 216 and a mounting plate portion 218. The cylindrical portion 216 has a thin-walled, large-diameter, generally cylindrical shape, and a stepped portion 220 is formed at a part of the middle in the axial direction. The step portion 220 has a substantially annular plate shape extending in the direction perpendicular to the axis, and a portion of the cylindrical portion 216 below the step portion 220 in the axial direction is a large diameter portion 222, while the step portion 220. A portion on the upper side in the axial direction is a small diameter portion 224. The large-diameter portion 222 is formed so as to extend downward from the outer peripheral side edge of the stepped portion 220 in the axial direction, and has a substantially cylindrical shape. On the other hand, the small-diameter portion 224 is formed to extend upward in the axial direction from the inner peripheral edge of the stepped portion 220 and has a substantially cylindrical shape with a small diameter compared to the large-diameter portion 222. . A mounting plate portion 218 is integrally formed at the axial upper end edge of the small diameter portion 224. The mounting plate portion 218 has a substantially annular plate shape extending in a direction perpendicular to the axis, and a plurality of fixing bolt insertion holes 226 penetrating in the plate thickness direction are formed.

  A resin bracket 228 is attached to the attachment plate portion 218 of the diaphragm outer tube fitting 196. The resin bracket 228 has a substantially cylindrical shape, and an upper flange 230 that extends radially outward is formed at the upper end in the axial direction. The upper flange 230 is provided with a fixing bolt 232 protruding upward in the axial direction, and the fixing bolt 232 is inserted into a fixing bolt insertion hole 226 formed in the mounting plate portion 218 of the diaphragm outer tube fitting 196. They are positioned with respect to each other and are inserted from below in the axial direction. The diaphragm outer tube fitting 196 is press-fitted and attached to the resin bracket 228 from above in the axial direction by a press-fit rubber 234 attached to the outer peripheral surface of the diaphragm outer tube fitting 196. A rebound stopper (not shown) is disposed in the axially upper direction with the diaphragm outer tube fitting 196 attached to the resin bracket 228, and is fixed with a fixing bolt 232 to be bolted with the resin bracket 228. The mounting plate portion 218 of the diaphragm outer cylinder fitting 196 is sandwiched between the rebound stoppers not to be connected, and the resin bracket 228 and the diaphragm outer cylinder fitting 196 are connected and fixed. In addition, a mounting bolt (not shown) attached to the vehicle body side is screwed to a mounting nut disposed at the lower end in the axial direction of the resin bracket 228, so that the second mounting bracket 188 is moved to the vehicle body side. It is fixed.

  A diaphragm inner fitting 192 is disposed on substantially the same central axis so as to be spaced apart upward in the axial direction of the diaphragm outer cylinder fitting 196, and an inner peripheral edge of the diaphragm 28 is an outer peripheral edge of the diaphragm inner fitting 192. In addition, the outer peripheral edge of the diaphragm 28 is vulcanized and bonded to the opening on the upper side in the axial direction of the diaphragm outer tube fitting 196. Thus, the diaphragm 28 is formed as a second integral vulcanization molded product 200 including the diaphragm inner metal fitting 192 and the diaphragm outer tube metal fitting 196.

  Thus, the second integral vulcanized molded product 200 is assembled on the first integral vulcanized molded product 198 from above, and the diaphragm inner metal fitting 192 is attached to the main rubber inner metal fitting 190. The diaphragm outer tube fitting 196 is fixed to the main rubber outer tube fitting 194, and the diaphragm 28 is spaced outward from the main rubber elastic member 16, so that the outer peripheral surface of the main rubber elastic member 16 is fixed. Is disposed so as to cover the entire surface.

  That is, the diaphragm inner metal fitting 192 is externally inserted with respect to the fitting portion 208 of the main rubber inner metal fitting 190 and positioned relative to each other in the radial direction, and the lower end of the diaphragm inner metal fitting 192 is the fitting step portion 204 of the main rubber inner metal fitting 190. And are positioned and connected to each other in the axial direction. Thus, the first mounting bracket 186 in the present embodiment is configured including the main rubber inner bracket 190 and the diaphragm inner bracket 192.

  Further, the diaphragm outer tube fitting 196 is externally inserted from the upper side in the axial direction with respect to the main rubber outer tube fitting 194, and a stepped portion 220 formed in the diaphragm outer tube fitting 196 is formed on the flange-like portion 214 of the main body rubber outer tube fitting 194. By being superimposed from above in the axial direction, they are positioned in the axial direction.

  On the other hand, a lid member 236 is assembled below the first integrally vulcanized molded product 198 in the axial direction. The lid member 236 has a substantially circular plate-shaped support rubber elastic body 70 to which a vibration plate 74 as a vibration member is vulcanized and bonded to the central portion thereof, and a second annular ring is formed on the outer peripheral portion thereof. An annular holding fitting 238 as a fixing member is vulcanized and bonded, and the vibration plate 74 and the annular holding fitting 238 are elastically connected by a support rubber elastic body 70.

  In the annular holding metal fitting 238, a substantially cylindrical tubular portion 242 protruding upward in the axial direction is integrally formed on the outer peripheral edge portion of the attachment plate portion 240 having a substantially annular plate shape. A groove-like portion 80 extending integrally with a predetermined length of a little less than one round in the circumferential direction is integrally formed on the inner peripheral edge. Further, the upper end of the cylindrical portion 242 is overlapped with the flange-shaped portion 214 of the main rubber outer cylinder fitting 194 from the lower side in the axial direction, and the annular holding metal fitting 238 is mutually connected in the axial direction with respect to the main rubber outer cylinder fitting 194. Is positioned on

  A vibration plate 74 is disposed on substantially the same central axis so as to be spaced inward in the radial direction of the annular holding metal fitting 238, and spread between the radial facing surfaces of the annular holding metal fitting 238 and the vibration plate 74. Thus, the support rubber elastic body 70 is disposed. Further, the supporting rubber elastic body 70 is vulcanized and bonded to the opposing surfaces of the annular connecting portion 90 of the vibration plate 74 and the groove-shaped portion 80 of the annular holding bracket 238 at the inner and outer peripheral edge portions. The space between the plate 74 and the annular holding metal fitting 238 is fluid-tightly closed by the support rubber elastic body 70. The annular holding metal fitting 238 and the vibration plate 74 are covered with seal rubber formed integrally with the support rubber elastic body 70 on the entire upper surface and inner peripheral surface thereof. Further, a sandwich rubber layer 244 formed separately from the support rubber elastic body 70 is attached to the outer peripheral surface of the cylindrical portion 216 of the annular holding metal fitting 238.

  Further, an electromagnetic exciter 94 is disposed below the lid member 236 in the axial direction, and a housing 96 in the electromagnetic exciter 94 is attached to the mounting plate 240 and the outer peripheral side wall 82 of the annular holding metal fitting 238. The electromagnetic exciter 94 and the lid member 236 are positioned and fixed to each other by being superimposed on each other.

  In this way, the second integral vulcanized molded product 200 is extrapolated from above in the axial direction in a state where the first integral vulcanized molded product 198, the annular holding bracket 238, and the electromagnetic exciter 94 are positioned with respect to each other. It is fitted in the state. That is, the diaphragm inner metal fitting 192 is fitted and fixed to the main rubber inner metal fitting 190, while the diaphragm outer cylinder metal fitting 196 inserted from the upper side in the axial direction of the main rubber outer tube metal fitting 194 is the stepped portion 220 as described above. Are positioned and fixed to each other in the axial direction by being superimposed on the flange-like portion 214 of the main rubber outer tube fitting 194 from above in the axial direction. Further, the large-diameter portion 222 of the diaphragm outer tube fitting 196 is in contrast to the flange portion 214 of the main rubber outer tube fitting 194, the tube portion 216 of the annular holding fitting 238, and the mounting flange portion 108 in the housing 96 of the electromagnetic exciter 94. In such an extrapolated state, the main diameter rubber outer cylinder fitting 194 and the annular holding fitting 238 are obtained by subjecting the large diameter portion 222 of the diaphragm outer cylinder fitting 196 to diameter reduction processing such as an eight-way stop. A diaphragm outer tube fitting 196 is fixed to the electromagnetic exciter 94. Thereby, the main rubber elastic body 16 is fixed to the diaphragm outer cylinder 196 as the second attachment member in the present embodiment via the main rubber outer cylinder 194.

  As a result, a fluid-tight region is formed between the opposed surfaces of the main rubber elastic body 16 and the diaphragm 28, and the incompressible fluid is sealed in this region, so that a part of the wall portion is configured by the diaphragm 28. On the other hand, an equilibrium chamber 150 in which volume fluctuation is easily allowed is formed. On the other hand, a fluid-tight region is formed between the opposed surfaces of the main rubber elastic body 16 and the lid member 236, and the region is incompressible. By enclosing the fluid, a part of the wall portion is composed of the main rubber elastic body 16 to form a pressure fluctuation working chamber 148 as a main liquid chamber in which pressure fluctuation is caused when vibration is input.

  In addition, a partition plate fitting 246 is disposed in the pressure fluctuation working chamber 148 so as to spread in the direction perpendicular to the axis. The partition plate fitting 246 has a thick, substantially disk shape, and has an outer diameter that reaches the outer peripheral side wall 82 of the annular holding fitting 238. The outer peripheral portion in the radial direction is superposed on the upper surface of the annular holding fitting 72, and the partition plate fitting 246 is disposed above the lid member 236 with substantially the same central axis as the lid member 236. An upper surface recess 248, which is a large-diameter circular recess, is formed in the upper surface central portion of the partition plate metal fitting 246, and a substantially inverted mortar-shaped lower surface recess 250 is formed in the lower surface central portion. Thus, the central portion in the radial direction of the partition plate fitting 246 is a thin portion 252. In addition, a lid groove 254 that opens downward in the axial direction is formed at the radially outer end of the partition plate fitting 246 so as to extend in the circumferential direction with a length of less than one round. Furthermore, an orifice through hole 158 formed through the thin portion 252 in the thickness direction is formed. Furthermore, an engaging stepped portion 256 extending substantially over the entire circumference is formed on the outer peripheral edge portion of the upper surface of the partition plate fitting 246.

  And the partition plate metal fitting 246 has its outer peripheral portion overlapped with the upper surface of the annular holding metal fitting 238, and the main rubber outer cylinder metal fitting 194 is opposed to the engaging stepped portion 256 formed on the outer peripheral edge portion of the upper surface. The lower end of the cylindrical portion 216 is overlapped in the axial direction, so that the partition plate fitting 246 is sandwiched between the annular holding fitting 238 and the main rubber outer tubular fitting 194 in the axial direction and spreads in the direction perpendicular to the axis. . As a result, the pressure fluctuation working chamber 148 is formed as a pressure receiving chamber 164 in which one side in the axial direction (upper side in FIG. 2) sandwiches the partition plate fitting 246 and the main rubber elastic body 16 constitutes a part of the wall portion. In addition, the other side (lower side in FIG. 2) is an excitation chamber 166 having a part of the wall portion formed of a lid member 236. These chambers 160 and 162 are communicated with each other through the orifice through-hole 142. It has been. Note that the lower end of the cylindrical portion 216 of the main rubber outer cylinder fitting 194 is overlapped with the engaging stepped portion 256, whereby the partition plate metal fitting 246 is positioned and fixed in the radial direction with respect to the main rubber outer cylinder fitting 194. ing.

  Here, the main body rubber outer tube fitting 194, the cylindrical portion 216 of the annular holding fitting 238, the mounting plate portion 240, and the partition plate fitting 246 are fluid-tightly combined by a seal rubber layer, and extend in a circumferential direction by a predetermined length. An outer annular channel 258 as one annular channel is formed. Further, the groove-shaped portion 80 in the annular holding fitting 238 and the opening of the lid groove 254 in the partition plate fitting 246 are overlapped with each other, so that the inner side as the second annular flow path extending in the circumferential direction by a predetermined length. An annular channel 260 is formed. And these annular flow paths 252 and 254 are connected in series by a connection flow path 262 formed through a part of the outer peripheral side wall surface of the inner annular flow path 260, and the annular flow path 264 is configured. Has been. One end of the annular channel 264 is communicated with the pressure receiving chamber 164 through the communication hole 178, and the other end is communicated with the equilibrium chamber 150 through the communication window 180. An orifice passage 266 that allows the equilibrium chamber 150 to communicate with each other includes an annular flow path 264. In the orifice passage 266 in the present embodiment, as in the first embodiment, the fluid that is caused to flow inside based on the pressure difference caused between the pressure receiving chamber 164 and the equilibrium chamber 150 when vibration is input. The passage cross-sectional area and the passage length are appropriately set and tuned so that the vibration isolation effect based on the resonance action is effectively exhibited in a specific frequency range such as idling vibration.

  Also in the automobile engine mount 184 having the structure according to this embodiment, it is possible to effectively obtain the same effects as the various effects exhibited in the automobile engine mount 10 according to the first embodiment. It is said that.

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

  For example, in the first and second embodiments, the partition plate fittings 152 and 246 are disposed so as to spread in the direction perpendicular to the axis in the pressure fluctuation working chamber 148, and the pressure is sandwiched between the partition plate fittings 152 and 246. Although the variable action chamber 148 is divided into the pressure receiving chamber 164 and the vibration chamber 166, such partition plate fittings 152 and 246 are not necessarily required. Further, the specific structure of the partition plate fittings 152 and 246 is not limited at all by the illustrations in the first and second embodiments.

  Further, the specific shapes of the main rubber outer cylinder fittings 22 and 194 and the annular holding fittings 72 and 238 are not limited in any way by the specific examples in the above-described embodiments, and the fittings 22 and 72 (194, 194) are not limited. 238) are used to form the outer and inner annular channels 170, 172 (258, 260), respectively, and the annular channels 170, 172 (258, 260) are connected in series to form the orifice channel 182. (266) may be configured. Furthermore, the material of the main rubber outer cylinder fittings 22 and 194 and the annular holding fittings 72 and 238 is not limited to metal, and various materials such as hard resin can be appropriately employed.

  Furthermore, the specific structure of the electromagnetic vibrator is not limited at all. For example, in addition to the illustrated structure, an electromagnetic exciter having an armature or a plunger having a plate-like magnetic force acting portion extending in a direction perpendicular to the axis can be similarly employed in the present invention. Furthermore, the vibrator is not necessarily electromagnetic, and a pneumatic vibrator or the like can be selected and employed.

  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.

It is a longitudinal section showing an engine mount as a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine mount 12 1st attachment metal fitting 14 Second attachment metal fitting 16 Main body rubber elastic body 22 Main body rubber outer cylinder metal fitting 24 Diaphragm outer cylinder metal fitting 28 Diaphragm 70 Support rubber elastic body 72 Excitation plate 74 Annular holding metal 94 Electromagnetic excitation 142 Cylindrical bracket 148 Pressure fluctuation working chamber 150 Equilibrium chamber 152 Partition plate metal fitting 158 Orifice through hole 170 Outer annular passage 172 Inner annular passage 182 Orifice passage

Claims (4)

The first mounting member is fixed to the small-diameter side end of the substantially truncated cone-shaped main rubber elastic body, and the second cylindrical mounting member is fixed to the large-diameter side end. One opening in the axial direction of the second mounting member is fluid-tightly closed with the main rubber elastic body, and a vibration member is disposed in the other opening in the axial direction of the second mounting member to dispose the vibration member in the first direction. The second mounting member is elastically supported by a supporting rubber elastic body, and the other opening in the axial direction of the second mounting member is fluid-tightly closed so that the main rubber elastic body and the vibration member are opposed to each other. A main liquid chamber in which an incompressible fluid is sealed between the surfaces is formed, and the actuator is supported by the second mounting member, and a driving force is applied to the vibration member by the actuator to reduce the pressure of the main liquid chamber. While being able to control, the thin annular flexible rubber membrane is separated outward from the main rubber elastic body. And sandwiching the main rubber elastic body by fluidly fixing the inner peripheral edge and the outer peripheral edge of the flexible rubber film to the first mounting member and the second mounting member, respectively. In the active fluid-filled vibration isolator in which a sub liquid chamber is formed on the opposite side of the main liquid chamber and an orifice passage is formed to connect the main liquid chamber and the sub liquid chamber to each other.
The main rubber body is formed by vulcanizing and bonding a first annular fixing member to the outer peripheral surface of the large-diameter side end of the main rubber elastic body and fixing the first annular fixing member to the second mounting member. The large-diameter side end of the elastic body is fixed to the second mounting member, and the second annular fixing member is vulcanized and bonded to the outer peripheral edge of the supporting rubber elastic body. By fixing to the second mounting member, the outer peripheral edge of the support rubber elastic body is fixed to the second mounting member, while using the first annular fixing member, a predetermined length in the circumferential direction is secured. Forming a first annular flow path extending in the circumferential direction, and forming a second annular flow path extending by a predetermined length in the circumferential direction using the second annular fixing member. And the second annular channel are connected in series to connect the main liquid chamber and the sub liquid chamber to each other. Active fluid filled type vibration damping device, characterized in that the formation of the office passage.   A partition member extending substantially orthogonal to the opposing direction of the main rubber elastic body and the vibration member is disposed between the opposing surfaces of the main rubber elastic body and the vibration member, and the main liquid chamber is disposed in the main liquid chamber. By partitioning with a partition member, a pressure receiving chamber in which a part of the wall portion is configured by the main rubber elastic body and a vibration chamber in which a part of the wall portion is configured by the vibration member are formed, and in the partition member, While forming a communication path that allows the pressure receiving chamber and the excitation chamber to communicate with each other, the outer peripheral edge of the partition member is overlapped and fixed to the second annular fixing member, and the partition member and the second chamber The active fluid-filled vibration isolator according to claim 1, wherein the second annular flow path is formed between the overlapping surfaces of the annular fixing members.   A substantially cylindrical outer cylinder member is vulcanized and bonded to the outer peripheral edge of the flexible rubber film, and the outer cylinder member is externally fitted to the first annular fixing member, while a substantially cylindrical bracket member is employed. Then, the bracket member is externally fitted to the second annular fixing member and overlapped in the axial direction with respect to the outer cylindrical member, and the outer cylindrical member and the bracket member are opened at one edge in each axial direction. The second mounting member is configured by caulking and fixing to each other, and the first annular fixing member and the second annular fixing member are caulked and fixed to the second mounting member at the caulking fixing portion. The active fluid-filled vibration isolator according to claim 1 or 2. The first annular fixing member and the second annular fixing member are arranged substantially coaxially, and the first annular fixing member is more in line with the first annular fixing member than the second annular fixing member. And the second annular fixing member is positioned outward in a direction perpendicular to the central axis, and the first annular flow path and a part of the second annular flow path are mutually connected in a projection perpendicular to the central axis. The active fluid-filled vibration isolator according to any one of claims 1 to 3, which is positioned so as to overlap.

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