JP2006242306A - Fluid filled vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid filled vibration isolator in which an abnormal sound can be certainly prevented from occurring in inputting a vibration. <P>SOLUTION: A through hole 82 allowing two fluid chambers 44 and 46 to communicate with each other is made in a partitioning member 42. Wall parts 81 and 83 are opposed to each other via the periphery of a moving plate 52 to cover all the through hole 82. A retainer 80 is formed to house and retain the periphery of the moving plate 52 between the wall parts 81 and 83. In each of the wall parts 81 and 83, a plurality of through holes 76 and 66 are bored at a predetermined interval with each other in the circumferential direction of the moving plate 52. The ratio of the maximum opening width of the through holes 76 and 66 to the distance between the through holes 76 and 66 adjoining with each other in the circumferential direction of the moving plate 52 is 1/16 to 1/2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid-filled vibration isolator, and in particular, has a plurality of liquid chambers filled with an incompressible fluid, and has a vibration-proof effect based on the fluid flow action between the plurality of liquid chambers. The present invention relates to an improved structure of a fluid-filled vibration isolator.

  Conventionally, as a kind of anti-vibration coupling body or anti-vibration support body interposed between members constituting the vibration transmission system, a first mounting member and a second mounting member are coupled by a main rubber elastic body. In addition, the main rubber elastic body is used as a part of the wall portion to form a first fluid chamber in which an incompressible fluid is sealed, and a partition member is interposed between the main fluid elastic body and the first fluid chamber. The partition member is provided with a through-hole that allows the first and second fluid chambers to communicate with each other, and forms a second fluid chamber filled with an incompressible fluid. A movable plate capable of blocking the through-hole is disposed so as to cover the entire surface of the movable plate, and the outer peripheral portion of the movable plate is accommodated and extended along the outer peripheral portion. It is possible to move freely between the chambers by a certain distance. Opposite positions on both sides of the outer periphery of the movable plate via the movable plate That the wall of the fluid filled type vibration damping device formed by providing a holder having a are known.

  In the fluid-filled vibration isolator having such a structure, the fluid flows between the first fluid chamber and the second fluid chamber through the through holes as the movable plate is moved by the input of vibration. Based on the fluid action of the fluid to be squeezed, it is possible to easily obtain an anti-vibration effect that is difficult to obtain with only a rubber elastic body. Therefore, application to, for example, automobile engine mounts and body mounts has been studied.

  By the way, in such a vibration isolator, when the movable plate is moved between the first fluid chamber and the second fluid chamber by the input of the vibration load, the opposing of the holding portion provided in the partition member. The amount of movement of the movable plate is regulated by being brought into contact with each of the wall portions, but it is caused by the impact force generated by the contact of the movable plate with the wall portion. As a result, a vibration force is generated, and as a result, resonance of the partition member and other members in contact with the partition member is induced, and there is a problem that abnormal noise is generated. When a shocking large load is input, the movable plate strongly hits against the wall portion of the partition member, so that a larger abnormal noise including a hitting sound is generated. It was a big problem.

  Therefore, in order to prevent such abnormal noise from occurring, a fluid-filled vibration isolator in which the partition member has a special structure has been proposed (for example, see Patent Document 1 below).

  That is, in such an anti-vibration device, the partition member has two partition bodies made of a single-bottomed cylindrical body having a low height, and these two partition bodies sandwich the movable plate in the axial direction. By being superimposed on each other and assembled, a movable plate is accommodated therein so as to be movable in the axial direction. Further, in such a partition member, a plurality of through holes are provided in the central portion of each partition body covered with the movable plate so as to be adjacent to each other in the circumferential direction, and each of the through holes penetrates the partition member. Holes are formed, and radially extending arm portions are formed between the adjacent through holes. And the rib which exhibits a protrusion form with respect to some of the several arm parts in one partition is integrally formed so that it may extend with mutually different length along the length direction of an arm part. ing.

  Thus, in the vibration isolator having the partition member having such a structure, since the ribs having different lengths are provided at the bottom of one partition constituting the partition member, the movable plate is When moving by vibration input, the timing of contact with the bottom of one of the partitions is partially made different, so that the impact force generated by the contact of the movable plate with the partition member is Is advantageously made smaller than in the case of simultaneously contacting the partition member. As a result, the vibration force generated due to the impact force is reduced, and the generation of abnormal noise due to the resonance of the partition member and the like can be prevented.

  However, in such a conventional fluid-filled vibration isolator, the ribs for preventing the generation of abnormal noise as described above are provided only on one of the two partitions constituting the partition member. Therefore, there has been a drawback that it is impossible to prevent any abnormal noise generated when the movable plate is brought into contact with the other partition. Further, in such a conventional device, the length of each rib must be designed so that the difference in length between the ribs is an appropriate value in order to obtain a sufficient effect of preventing the generation of abnormal noise. There was also a problem that it was extremely troublesome. Moreover, in the conventional apparatus, for example, when the movable plate is brought into contact with one partition having the ribs, a gap is easily formed between the movable plate and the ribs. There was also a problem that it was difficult to ensure sufficient sealing between the partition and the partition.

Japanese Patent No. 2875723

  Here, the present invention has been made in the background as described above, and the problem to be solved is that it is easier and more reliable to prevent the generation of abnormal noise during vibration input. It is an object of the present invention to provide an improved structure of a fluid-filled type vibration damping device that can be realized as described above.

  Hereinafter, the aspect of this invention made in order to solve this subject is described.

  In the first aspect of the present invention, the first mounting member and the second mounting member are connected to each other by a main rubber elastic body, and the main rubber elastic body is used as a part of a wall portion so that an incompressible fluid is enclosed. A first fluid chamber formed on the opposite side of the first fluid chamber with a partition member interposed therebetween, and a second fluid chamber in which an incompressible fluid is enclosed, The partition member is provided with a through hole that allows the first and second fluid chambers to communicate with each other, and a movable plate that can block the through hole is disposed so as to cover the entire through hole. , Accommodating the outer peripheral portion of the movable plate, extending along the outer peripheral portion, and allowing the movable plate to freely move a fixed distance between the first fluid chamber and the second fluid chamber. A fluid-filled vibration isolator comprising a holding portion having wall portions opposed to each other through the outer peripheral portion on both sides of the outer peripheral portion of the movable plate A through hole communicating with the inside of the holding portion and the first fluid chamber or the second fluid chamber is formed in each of the opposing wall portions of the holding portion provided in the partition member, and the movable plate And a plurality of openings provided at a predetermined distance in the circumferential direction and between the through hole and the outer peripheral end of the movable plate, and a maximum opening width (W) of the through hole, It is characterized in that the ratio (W / L) of the distance (L) between the through holes adjacent to each other in the circumferential direction is 1/16 to 1/2.

  That is, in this embodiment, when the movable plate is moved between the first fluid chamber and the second fluid chamber by the input of the vibration load, the movable plate in the holding portion is moved. Along with the movement of the outer peripheral portion, incompressible fluid flows between the holding portion and the first fluid chamber, and between the holding portion and the second fluid chamber, on the wall portion of the partition member facing the holding portion. It can be made to flow through the plurality of through holes provided. At this time, the portion of the outer peripheral portion of the movable plate facing the through hole forming portion in the wall portion of the holding portion is the first fluid chamber side or the second fluid by the flow action of the incompressible fluid. It is pressed toward the chamber side and is brought into contact with each wall portion earlier than a portion of the outer peripheral portion of the movable plate that does not face the through hole forming portion in the wall portion of the holding portion.

  Thus, in this aspect, when the vibration is input, the timing at which the outer peripheral portion of the movable plate contacts the wall portion of the holding portion becomes nonuniform on the outer periphery of the movable plate, and thus the outer periphery of the movable plate. It can be advantageously avoided that the part is brought into contact with the wall part of the holding part simultaneously over the entire circumference. As a result, the impact force generated by the contact of the outer peripheral portion of the movable plate with the wall portion of the holding portion is advantageously made smaller than when the entire movable plate contacts the partition member at the same time.

  In this aspect, the ratio (W / L) of the maximum opening width (W) of the through hole and the distance (L) between the through holes adjacent to each other in the circumferential direction of the movable plate is within a specific range. The plurality of through holes are relatively spaced apart from each other in the circumferential direction of the movable plate with respect to each of the opposing wall portions of the holding portion. Are formed with a small opening width. Therefore, for example, because the distance between adjacent through holes is small or because the opening width of each through hole is large, the fluid that allows the entire outer peripheral portion of the movable plate to flow through each through hole at the time of vibration input. It is possible to effectively prevent the pressure from being pressed at the same time and being simultaneously brought into contact with the wall portion of the holding portion.

  Further, in this aspect, since the opening width of each through hole is relatively small, the outer peripheral portion of the movable plate is provided on one of the opposing wall portions of the holding portion by the input of vibration. When pressed by the fluid that flows into the holding portion through the through hole and moved toward the other wall, the fluid in the holding portion passes through the through hole provided in the other wall. Under the flow resistance increased by the opening width, the fluid can flow toward the first fluid chamber and the second fluid chamber. Also by this, the impact force generated by the contact of the outer peripheral portion of the movable plate with the wall portion of the holding portion can be advantageously reduced.

  In addition, in this aspect, in order to prevent the outer peripheral portion of the movable plate from being simultaneously brought into contact with each of the opposing wall portions of the holding portion over the entire circumference, each of them is basically provided. A plurality of through holes are merely provided in the wall portion without any particular limitation on the size of the individual ones, and such through holes are located on both sides of the outer peripheral portion of the movable plate. It is provided on both of the walls.

  Therefore, for example, unlike the above-described conventional apparatus, which has a structure in which only one of the opposing wall portions of the holding portion is provided with ribs having ridge shapes having different lengths with a predetermined difference. The movable plate is held regardless of whether the movable plate is moved to the first fluid chamber side or the second fluid chamber side by the fluid flow action by the vibration input. Simultaneous contact over the entire circumference of the outer peripheral part of the movable plate with respect to each wall part of the part can be easily and reliably avoided without requiring a troublesome design work.

  Therefore, in this embodiment as described above, the impact force generated when the outer peripheral portion of the movable plate comes into contact with each of the opposing wall portions of the holding portion during vibration input is easily and reliably reduced. As a result, the vibration force generated due to this can be advantageously reduced. As a result, it is possible to more easily and more reliably prevent the generation of noise due to the contact of the outer peripheral portion of the movable plate with each wall portion of the holding portion in such a partition member. And generation | occurrence | production of the bigger abnormal noise at the time of the input of the shocking heavy load which was especially a problem in the past can be prevented very effectively.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator according to the first aspect, an orifice passage that communicates the first fluid chamber and the second fluid chamber with the partition member. Is provided.

  In this aspect, by tuning the orifice passage to a low frequency range such as an engine shake, for example, when such low frequency large amplitude vibration is input, the resonance action of the fluid that flows through the orifice passage Based on the above, an effective anti-vibration effect is exhibited. Moreover, the input of such low-frequency large-amplitude vibrations can reliably reduce the impact force that occurs when the outer peripheral portion of the movable plate contacts each of the opposing wall portions of the holding portion. Generation of abnormal noise at the time of inputting high frequency vibration can be effectively prevented.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator according to the first or second aspect, protrusions extending continuously in the circumferential direction are integrally formed on both surfaces of the outer peripheral end of the movable plate. It is characterized by being provided.

  According to this aspect, since only the ridges of the outer peripheral portion of the movable plate are brought into contact with the respective wall portions of the holding portion at the time of vibration input, the contact area of the movable plate with respect to the respective side walls is effective. Can be made small. Thereby, the impact force generated at the time of contact with each wall portion of the outer peripheral portion of the movable plate is advantageously suppressed to a low level, so that the generation of abnormal noise due to contact with each wall portion of the outer peripheral portion of the movable plate is also more effective. Can be prevented.

  Further, in this aspect, for example, when the movable plate is brought into contact with the wall portion of the holding portion, the protrusion is caused to function as a seal member, and between the first fluid chamber and the second fluid chamber. The fluid flow is reliably interrupted. Therefore, in this embodiment, for example, when employed together with the configuration according to the second embodiment, that is, the configuration in which the orifice passage is formed with respect to the partition member, the fluid is caused to flow through the orifice passage. An effective anti-vibration effect based on the resonance action of the fluid can be exhibited even more advantageously.

  According to a fourth aspect of the present invention, in the fluid-filled vibration isolator according to the third aspect, the plurality of through holes are positioned on the inner side of the projecting portion of the protrusion on the movable plate. It is provided in each of the wall part which the said holding part opposes, It is characterized by the above-mentioned.

  According to this aspect, the protrusions cause the fluid introduced into the holding portion from the first fluid chamber or the second fluid chamber through the respective through holes to flow toward the outer peripheral edge along both surfaces of the outer peripheral portion of the movable plate. As a damming portion for damming the hamlet, it can function advantageously. As a result, a portion of the outer peripheral portion of the movable plate that is opposed to the through hole forming portion in each wall portion of the holding portion is more efficiently pressed toward each wall portion of the holding portion by the fluid flow action. Thus, as compared with other portions, the respective wall portions of the holding portion can be brought into contact more quickly and more reliably. As a result, it is possible to more advantageously prevent the generation of abnormal noise during vibration input.

Further, in this aspect, for example, as described above, a fluid is used between the first fluid chamber and the second fluid chamber by using a protrusion as a seal member when the through hole is fluid-tightly closed. When blocking the flow, it is possible to effectively prevent the fluid flow in both the chambers from being generated through each through hole.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to fourth aspects, the plurality of through holes are formed on the wall portions facing the holding portion. It is characterized in that it is provided in each corresponding part.

  According to this aspect, the portion of the outer peripheral portion of the movable plate that faces the through-hole forming portion in each wall portion of the holding portion is located on each wall portion of the holding portion as compared to the portion that does not face it. On the other hand, they can be contacted more quickly. Thereby, simultaneous contact over the entire circumference of the outer peripheral portion of the movable plate with respect to each wall portion of the holding portion can be more reliably and more stably prevented, and as a result, the occurrence of abnormal noise at the time of vibration input, It can be prevented even more effectively.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to fifth aspects, the first fluid chamber side or the second second in the through hole. The opening that opens to the fluid chamber side has a larger diameter than the opening that opens to the holding unit, and the inner peripheral surface of each of the plurality of through-holes extends from the holding unit to the first It has a taper-shaped inner peripheral surface that gradually increases in diameter toward the fluid chamber side or from the holding portion side toward the second fluid chamber side.

  According to this aspect, the incompressible fluid can be caused to flow more smoothly from the first fluid chamber or the second fluid chamber into the holding portion through each through hole. Of the outer peripheral part of the movable plate, the part facing the through hole forming part in each wall part of the holding part is brought into contact with each wall part of the holding part more quickly than the part not facing it. It becomes like this. As a result, it is possible to more advantageously prevent the generation of abnormal noise during vibration input.

  According to a seventh aspect of the present invention, in the fluid filled type vibration damping device according to any one of the first to sixth aspects, the maximum opening widths (W) of the adjacent through holes are mutually different. It is characterized by having different sizes.

  According to this aspect, through each through hole, based on the difference in the maximum opening width (W) of each through hole between the holding portion and the first fluid chamber and between the holding portion and the second fluid chamber. Variation occurs in the flow rate of the incompressible fluid to be flowed. As a result, the timing at which the outer peripheral portion of the movable plate comes into contact with each wall portion of the partition member becomes even more uneven on the periphery of the outer peripheral portion of the movable plate, so that the outer peripheral portion of the movable plate is held. It can be more effectively avoided that the respective wall portions of the portion are simultaneously brought into contact with the entire circumference. As a result, it is possible to more advantageously prevent the generation of abnormal noise during vibration input.

  According to an eighth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to seventh aspects, between the through holes adjacent to each other in the circumferential direction of the movable plate. The feature is that the distances (L) have different sizes.

  Even in this embodiment, the timing at which the outer peripheral portion of the movable plate comes into contact with each wall portion of the holding portion becomes even more uneven on the periphery of the outer peripheral portion of the movable plate. The effect of preventing the generation of abnormal noise at the time of vibration input can be enjoyed even more advantageously.

  According to a ninth aspect of the present invention, in the fluid-filled vibration isolator according to any one of the first to eighth aspects, the movable plate is made of an elastically deformable material. Is a feature.

  According to this aspect, partial elastic deformation on the periphery of the movable plate is allowed. Accordingly, due to the fluid flow action through the through hole, the portion of the outer peripheral portion of the movable plate that opposes the through hole forming portion in each wall portion of the holding portion is elastically deformed, and thus compared to the portion that does not face the portion. And it comes to contact with each wall part of a holding | maintenance part more speedily. As a result, it is possible to more advantageously prevent the generation of abnormal noise during vibration input. Further, when vibration is input, based on a fluid flow action of fluid that is circulated between the first fluid chamber and the second fluid chamber through a through hole between the first fluid chamber and the second fluid chamber. In addition to the anti-vibration effect exhibited in this way, the anti-vibration effect based on the elastic deformation action of the movable plate is also advantageously obtained.

  As is clear from the above description, in the fluid filled type vibration damping device according to the present invention, the generation of abnormal noise due to the contact between the movable plate and the partition member at the time of vibration input is extremely advantageous and more It can be effectively prevented.

  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, in FIG. 1 and FIG. 2, an automotive engine mount as a first embodiment of the present invention is schematically shown in a longitudinal sectional form and a top form, respectively. As is clear from these drawings, the engine mount of this embodiment includes a first mounting member 10 as a first mounting member and a second mounting member 12 as a second mounting member. The first mounting bracket 10 and the second mounting bracket 12 are configured to be spaced apart from each other in the vertical direction and to be elastically connected by the main rubber elastic body 14.

  The first mounting bracket 10 is attached to the power unit of the automobile, while the second mounting bracket 12 is attached to the body of the automobile, so that the power unit is supported by the body against vibration. Moreover, under such a mounted state, the power unit weight is exerted, whereby the main rubber elastic body 14 is elastically deformed so that the first mounting bracket 10 and the second mounting bracket 12 are positioned close to each other. Under such a mounting state, main vibrations to be vibrated are input in the approach / separation direction of the first mounting bracket 10 and the second mounting bracket 12 (substantially vertical direction in FIG. 1 which is the mount center axis). The Rukoto. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting bracket 10 has a substantially disk shape, and a mounting bolt 16 projecting upward is fixed to the center of the first mounting bracket 10. One mounting bracket 10 is fixedly attached to a power unit (not shown). Further, at the center of the lower surface of the first mounting bracket 10, a cup-shaped bracket 18 having a tapered peripheral wall is superposed at the opening and fixed by welding or the like.

  On the other hand, the second mounting bracket 12 has a large-diameter, generally cylindrical shape as a whole. Further, in the second mounting bracket 12, an inner flange portion 20 that protrudes by a predetermined dimension radially inward and continuously extends in the circumferential direction is integrally formed with respect to the peripheral portion of the upper opening. In addition, a portion other than the inner flange portion 20 is a cylindrical portion 22.

  Then, on the substantially central axis of the second mounting bracket 12, the first mounting bracket 10 is disposed so as to be spaced apart above the second mounting bracket 12 and spread in the direction perpendicular to the axis. A main rubber elastic body 14 is interposed between the first mounting bracket 10 and the second mounting bracket 12.

  The main rubber elastic body 14 as a whole has a large-diameter substantially frustoconical shape, and has a recess 24 that opens downward on the end surface on the large-diameter side. In the main rubber elastic body 14, the first mounting bracket 10 is overlapped with the end surface on the small diameter side in a state where the cup-shaped bracket 18 is embedded in the end portion on the small diameter side, and vulcanized. On the other hand, the inner flange portion 20 of the second mounting bracket 12 is overlapped and vulcanized and bonded to the large-diameter side end surface surrounding the recess 24. In short, the main rubber elastic body 14 is formed as an integrally vulcanized molded product including the first mounting bracket 10 and the second mounting bracket 12. Thus, the upper opening of the second mounting member 12 is fluid-tightly covered with the main rubber elastic body 14. An inner seal rubber layer 26 that covers substantially the entire surface of the second mounting bracket 12 is formed integrally with the main rubber elastic body 14. Further, an outer seal rubber layer 28 that covers the lower portion of the cylindrical portion 22 of the second mounting member 12 is integrally formed.

  On the other hand, a mounting ring 30 is disposed in the lower opening of the second mounting bracket 12. The mounting ring 30 is formed with respect to an annular plate portion 32 having an outer diameter larger than the outer diameter of the second mounting bracket 12 and an inner diameter smaller than the inner diameter, and an outer peripheral edge portion of the annular plate portion 32. The upper cylindrical portion 34 that is integrally formed so as to protrude upward with a predetermined height and the inner peripheral edge of the annular plate portion 32 protrude downward with a predetermined height. The lower cylindrical portion 36 is formed integrally with the lower cylindrical portion 36.

  Further, in the mounting ring 30, a diaphragm 38 made of a rubber thin film as a flexible film is disposed inside the lower cylindrical portion 36 so as to cover the entire inner hole of the annular plate portion 32. ing. The diaphragm 38 has a thin disk shape that is slack so as to be easily deformed, and is vulcanized and bonded to the inner peripheral surface of the lower cylindrical portion 36 of the mounting ring 30 at the outer peripheral edge portion. Yes. That is, in other words, the diaphragm 38 is configured as an integrally vulcanized molded product in which the mounting ring 30 is vulcanized and bonded to the outer peripheral edge portion thereof.

  Such a mounting ring 30 is brought into contact with the lower end surface of the second mounting bracket 12 at the outer peripheral portion of the upper surface of the annular plate portion 32, and the second mounting bracket at the upper cylindrical portion 34. For example, the upper cylindrical portion 34 is subjected to a diameter reduction process or the like to be fitted and fixed to the second mounting bracket 12. ing. In such a fixed state, the outer cylindrical surface of the second mounting bracket 12 and the upper cylindrical portion of the mounting ring 30 are formed by the outer seal rubber layer 28 integrally formed on the outer peripheral surface of the second mounting bracket 12. A space between the inner peripheral surface of 34 is liquid-tightly sealed.

  As a result, the lower opening of the second mounting bracket 12 is liquid-tightly covered with the mounting ring 30 and the diaphragm 38 that closes the inner hole thereof. A fluid chamber 40 in which an incompressible fluid is sealed is formed between the opposing surfaces of the main rubber elastic body 14 and the diaphragm 38 that cover (both sides in the axial direction). As the sealing fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is employed. In order to advantageously obtain a vibration isolation effect based on the resonance action of the fluid described later, in this embodiment, 0 is used. A low-viscosity fluid of 1 Pa · s or less is preferably employed.

  In addition, a partition member 42 is accommodated in the second mounting bracket 12 and assembled in the fluid chamber 40. The partition member 42 has a substantially thick disk shape as a whole, and is fixed to the second mounting member 12 in a state where the partition member 42 spreads in the direction perpendicular to the axis in the fluid chamber 40. Thus, the fluid chamber 40 is partitioned on both upper and lower sides with the partition member 42 interposed therebetween. An upper side of the partition member 42 is a space inside the recess 24 of the main rubber elastic body 14, and a part of the wall portion is configured by the main rubber elastic body 14 as a first fluid chamber. While the pressure receiving chamber 44 is formed, an equilibrium chamber 46 as a second fluid chamber is formed below the partition member 42, and a part of the wall portion is constituted by a diaphragm 38. That is, in the pressure receiving chamber 44, vibration is input along with elastic deformation of the main rubber elastic body 14 at the time of vibration input, and an internal pressure fluctuation is generated, while the equilibrium chamber 46 is based on the deformation of the diaphragm 38. Thus, the volume change is easily allowed and the internal pressure change is absorbed.

  Thus, here, the partition member 42 is formed by assembling the partition member main body 48 and the lid body 50 so as to overlap each other, and the movable plate 52 is provided in the vertical direction in the interior thereof. It is arranged to be movable. In the engine mount according to the present embodiment, in particular, in such a specific configuration of the partition member 42, there are significant features that are not found in the conventional mount.

  That is, as shown in FIGS. 3 and 4, the partition member body 48 is formed of a substantially circular block body having a predetermined thickness and formed using a hard synthetic resin material or a metal material such as an aluminum alloy. ing. A circular recess 54 having a predetermined depth is formed in the central portion of the upper surface of the partition member main body 48, and the outer peripheral portion thereof is continuously provided with a circumferential length of approximately one round. An extending circumferential groove 56 having a rectangular cross section is formed so as to surround the circular recess 54 over substantially the entire circumference. That is, on the upper surface of the partition member main body 48, a partition wall 57 having a circumferential length of approximately one round and extending in the circumferential direction is provided in the radial intermediate portion, and the partition wall 57 is sandwiched therebetween. A circular recess 54 is provided on the inner side, and a circumferential groove 56 is provided on the outer side. And in this circumferential groove 56, the window part 58 which exhibits a substantially rectangular shape is formed in the one end part of the bottom part extended in the circumferential direction so that the bottom part may be penetrated.

  In addition, a circular center hole 60 is provided in the center of the bottom of the circular recess 54 provided in the center of the partition member body 48 so as to penetrate in the plate thickness direction. Further, around the central hole 60 at the bottom of the circular recess 54, for example, four through holes 62 having a substantially fan shape are formed at a certain distance from each other in the circumferential direction. Furthermore, one radial rib 64 extending radially with a predetermined width is provided between adjacent ones of the four through-holes 62, and each of the through-holes 62 and the center hole 60 is provided with one radial rib 64. A ring-shaped rib 65 is formed between them.

  Here, in particular, at the bottom of the circular recess 54 of the partition member main body 48, for example, four through holes 66 penetrating the bottom are provided on the outer peripheral side of the portion where the plurality of through holes 62 are formed. Yes. Each of these four through holes 66 has a circular upper opening (opening on the inner surface side of the bottom of the circular recess 54) and a circular lower opening (diameter of the circular recess 54 having a larger diameter). And the circular recess 54 is configured to communicate with the outside except for the upper opening, and the entire inner peripheral surface gradually decreases downward. The tapered surface has a large diameter.

  Further, such four through-holes 66 are provided at the substantially central portion in the radial direction at the portion between the formation portion of the through hole 62 and the formation portion of the partition wall 57 at the bottom of the circular recess 54. Located on the respective extensions of the radial ribs 64. That is, they are arranged at equal intervals in the circumferential direction at the radial intermediate portion between the center portion and the outer peripheral edge portion of the partition member main body 48.

  On the other hand, as is apparent from FIGS. 1, 5, and 6, the lid 50 has the same diameter as the partition member body 48 formed using a hard synthetic resin material or a metal material such as an aluminum alloy. It consists of a circular thin plate. A central hole 68, four through holes 70, four radial ribs 72, and one ring-shaped rib 74 are formed in the central portion of the lid 50, and the circular recess 54 of the partition member main body 48 is formed. Each of the center hole 60, the four through holes 62, the four radial ribs 64, and the one ring-shaped rib 65 provided at the bottom has the same size and the same shape, and further the bottom of the circular recess 54. It is arranged in the same form as the arrangement form. Further, a window portion 75 having the same shape and size as the window portion 58 provided at the bottom of the circumferential groove 56 of the partition member main body 48 is provided in the outer peripheral portion so as to penetrate in the plate thickness direction.

  Further, even in the lid body 50, for example, four through holes 76 that penetrate in the thickness direction are provided on the outer peripheral side of the formation site of the plurality of through holes 70. These through holes 76 are also arranged in the same manner as the four through holes 66 provided at the bottom of the circular recess 54 of the partition member main body 48. That is, they are arranged at equal intervals in the circumferential direction at the radial intermediate portion between the center portion and the outer peripheral edge portion of the lid 50.

  Further, in each through hole 76 provided in the lid 50, the lower opening is the same as the upper opening of each through hole 66 provided in the bottom of the circular recess 54 of the partition member body 48. On the other hand, the upper opening has a circular shape having a larger diameter and the same diameter as the opening of the lower opening of each through-hole 66. And the whole inner peripheral surface of each through-hole 76 is made into the taper surface shape which becomes large diameter gradually upwards.

  7 and 8, the lid 50 having the above-described structure covers the circumferential groove 56 and the circular recess 54 of the partition member main body 48, and the lid 50 The central hole 68, the four through holes 70, and the four through holes 76 are respectively arranged in the vertical direction with respect to the central hole 60, the four through holes 62, and the four through holes 66 of the partition member body 48. At the corresponding position, it is superimposed on the upper surface of the partition member main body 48 and assembled. Thus, the partition member 42 is configured as an assembly of the partition member main body 48 and the lid body 50.

  Further, in the partition member 42 made of such an assembly, the circumferential groove 56 of the partition member main body 48 is covered with the lid body 50, so that the orifice extends to the outer peripheral portion with a circumferential length of approximately one round. A passage 78 is formed. The orifice passage 78 is communicated to the outside in the vertical direction through windows 75 and 58 provided on the outer peripheral portions of the lid 50 and the partition member main body 48, respectively.

  Further, the circular recess 54 of the partition member main body 48 is covered with the lid body 50, so that a holding portion 80 is formed in the central portion of the partition member 42. That is, the holding portion 80 includes a lower bottom wall portion that is a bottom portion of the circular recess 54 in the partition member main body 48 and an upper bottom wall portion that is a center portion of the lid body 50 that are disposed to face each other in the vertical direction. And has a side wall portion formed of a cylindrical partition wall 57 erected on the partition member main body 48.

  And in this holding | maintenance part 80, each central hole 60 and 68 of the partition member main body 48 and the cover body 50 is coaxially located in the center part, and these partition holes a main part of a partition member main body 60,68. A through hole 82 penetrating the center of 48 is provided. Further, the through holes 62 and 70 of the partition member main body 48 and the lid body 50 are positioned coaxially on the outer side in the radial direction, and the inner peripheral portion of the partition member 48 is formed by the through holes 62 and 70. A through hole 82 is provided therethrough. Furthermore, the through hole of the partition member main body 48 and the lid 50 are formed in the outer peripheral portion 81 of the upper bottom wall portion and the outer peripheral portion 83 of the lower bottom wall portion, which are radially outward from the formation site of the through holes 82. 66 and 76 are positioned coaxially. As a result, the inside of the holding portion 80 is communicated to the outside through the through holes 82 at the inner peripheral portion thereof, and is communicated to the outside through the through holes 76 and 66 at the outer peripheral portion.

  Further, the movable plate 52 is accommodated and held in the holding portion 80 of such a partition member 42. The movable plate 52 is a rubber circular plate having an outer diameter that is slightly smaller than the inner diameter of the circular recess 54 of the partition member body 48 and a thickness that is approximately half the depth of the circular recess 54. It has become. Further, on both surfaces of the outer peripheral edge portion of the movable plate 52, protrusions 84 projecting a predetermined height with a substantially chevron-shaped cross section and continuously extending in the circumferential direction are integrally formed.

  Such a movable plate 52 covers the lower bottom wall portion of the holding portion 80, that is, substantially the entire bottom of the circular recess 54 of the partition member main body 48 in the holding portion 80, and each of the through holes 82. It arrange | positions so that between the partition member main body 48 which comprises an upper side opening part and a lower side opening part, and the center holes 60 and 68 of the cover body 50, and between each through-holes 62 and 70, respectively. Further, the ridges 84, 84 provided on both surfaces of the outer peripheral edge portion are slightly smaller than the portions where the through holes 66, 76 are formed in the outer peripheral portions 81, 83 of the upper and lower bottom wall portions of the holding portion 80. It arrange | positions in the state located in the radial direction outer side.

  Thereby, here, the movable plate 52 covers all of the plurality of through holes 82 provided in the inner peripheral portion of the holding portion 80 and blocks each of the through holes 82 on the inner peripheral portion thereof. The portions are arranged in a state where they correspond to the respective through holes 66 and 76 provided in the respective outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80. Moreover, under such an arrangement state, the movable plate 52 includes protrusions 84 and 84 provided on both surfaces of the outer peripheral edge portion, and outer peripheral portions 81 and 83 on the upper and lower bottom wall portions of the holding portion 80, respectively. Within the range until they are brought into contact with each other, the inside of the holding portion 80 can be freely moved in the vertical direction. Further, the through holes 66 and 76 provided in the outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80 are formed between the outer peripheral edge portion of the movable plate 52 and the plurality of through holes 82. The movable plate 52 is positioned on the inner side of the protrusion 84 forming portion and in the vicinity of the protrusion 84 forming portion.

  As is clear from this, in this embodiment, the outer peripheral portion 81 of the upper bottom wall portion and the outer peripheral portion 83 of the lower bottom wall portion of the holding portion 80 face each other through the movable plate 52 in the holding portion 80. The positioned wall portions are respectively configured, and the through holes 66 and 76 are provided to the outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80 constituting such a wall portion. However, they are positioned at a predetermined distance from each other in the circumferential direction of the outer peripheral portion of the movable plate 52.

  As shown in FIG. 1, the partition member 42 having such a structure extends in the second mounting bracket 12 on the same axis and in the direction perpendicular to the axis, and the upper surface of the lid 50 receives the pressure. While being exposed in the chamber 44, the lower surface of the partition member main body 48 is exposed in the equilibrium chamber 46 so that the internal pressures of the pressure receiving chamber 44 and the equilibrium chamber 46 can be exerted on the upper and lower surfaces. ing.

  Further, under such an arrangement state, the window portions 75 and 58 of the lid body 50 and the partition member main body 48 are opened in the pressure receiving chamber 44 and the equilibrium chamber 46, respectively. The provided orifice passage 78 is positioned so as to communicate the pressure receiving chamber 44 and the equilibrium chamber 46.

  Further, the through holes 70 and 62 of the lid body 50 and the partition member main body 48 are also opened in the pressure receiving chamber 44 and the equilibrium chamber 46, respectively, and a plurality of through holes 82 provided in the partition member 42. However, the pressure receiving chamber 44 and the equilibrium chamber 46 are positioned to communicate with each other. And thereby, it is enclosed in the holding | maintenance part 80 of the partition member 42 by the inner surface of each outer peripheral part 81 and 83 of the upper side and lower side wall part, and the outer surface of the outer peripheral part of the movable plate 52, and the cover body 50. Through the through holes 70 and 62 of the partition member main body 48, fluid flow paths opened in the pressure receiving chamber 44 and the equilibrium chamber 46 are formed. That is, a fluid flow path including a plurality of through holes 82 is formed with respect to the partition member 42.

  Furthermore, the through holes 76 and 66 provided in the lid 50 and the partition member main body 48 are also opened in the pressure receiving chamber 44 and the equilibrium chamber 46, respectively, so that the holding portion 80, the pressure receiving chamber 44, and the equilibrium chamber are opened. 46 to be in communication with each other. As a result, the inner peripheral surfaces of the through holes 76 and 66 gradually increase in diameter from the holding portion 80 side toward the pressure receiving chamber 44 side or from the holding portion 80 side toward the equilibrium chamber 46 side. It is made to become a tapered surface shape.

  Then, the partition member 42 arranged in such a manner is held and fixed in a fluid-tight manner between the upper surface of the annular plate portion 32 of the mounting ring 30 and the lower end surface of the main rubber elastic body 14. -ing

  Thus, in the engine mount according to the present embodiment having such a structure, the approach / removal between the first mounting bracket 10 and the second mounting bracket 12 under the mounting state on the automobile. When vibration in the separation direction (vertical direction in FIG. 1) is input, a relative pressure difference is generated between the pressure receiving chamber 44 and the equilibrium chamber 46, so that the space between the chambers 44 and 46 is increased. , The fluid flow through the orifice passage 78, the vertical movement of the rubber movable plate 52 toward the pressure receiving chamber 44 and the equilibrium chamber 46, the elastic deformation of the movable plate 52, and further, Substantial fluid flow through the fluid flow path including the plurality of through holes 82 based on movement and elastic deformation is generated.

  Here, the orifice passage 78 is tuned to a low frequency region such as an engine shake, and thereby fluid that flows through the orifice passage 78 when a low frequency large amplitude vibration such as an engine shake is input. An effective anti-vibration effect is exhibited based on the resonance action.

  At this time, the movable plate 52 held by the holding portion 80 of the partition member 42 is moved to the equilibrium chamber 46 side or the pressure receiving chamber 44 side based on the internal pressure difference between the pressure receiving chamber 44 and the equilibrium chamber 46. Thus, the outer peripheral portion comes into contact with the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80 and the outer peripheral portion 83 of the lower bottom wall portion. As a result, all of the plurality of through holes 70 on the pressure receiving chamber 44 side in the plurality of through holes 82 and all of the plurality of through holes 62 on the equilibrium chamber 46 side are closed, and a fluid flow path including the plurality of through holes 82 is obtained. Therefore, the vibration isolation effect based on the fluid flow action through the orifice passage 78 can be more effectively exhibited.

  At this time, each of the outer peripheral portions 81 and 83 of the holding portion 80 with which the outer peripheral portion of the movable plate 52 is brought into contact is provided with only a plurality of through holes 76 and 66, and no protrusions are provided. Absent. Moreover, the movable plate 52 is made of a rubber material that can be elastically deformed. Therefore, for example, unlike the conventional device in which ribs having a ridge shape are provided at the contact portion of the partition member 42 with the movable plate 52, the outer peripheral portion of the movable plate 52 and the holding portion 80 with which it is brought into contact. It is possible to effectively prevent a gap from being formed between the outer peripheral portions 81 and 83 and the sealing performance from being impaired.

  Further, here, since the protrusions 84 extending continuously in the circumferential direction are provided on both surfaces of the outer peripheral edge portion of the movable plate 52, the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding portion 80 is provided. At the time of contact with the outer peripheral portion, the protrusion 84 provides a sufficient sealing function, and the fluid flow through the fluid flow path including the plurality of through holes 82 is more reliably prevented. At this time, the through holes 76 and 66 provided in the outer peripheral portions 81 and 83 of the holding portion 80 are positioned on the inner side of the projecting ridge 84 forming portion of the movable plate 52. The fluid flow between the pressure receiving chamber 44 and the equilibrium chamber 46 is not caused through the holes 76 and 66.

  In the present embodiment, the movable plate 52 is elastically deformed on the basis of the internal pressure difference between the pressure receiving chamber 44 and the equilibrium chamber 46 when the low frequency large amplitude vibration is input. The amount of elastic deformation of the movable plate 52 is limited by the contact of the inner peripheral portion of the movable plate 52 with the plurality of radial rings 72 and 64 and the ring-shaped ribs 74 and 65 respectively provided on the lower bottom wall portion. Therefore, it is advantageously prevented that the fluid flow amount through the orifice passage 78 becomes insufficient due to the elastic deformation of the movable plate 52 at the time of inputting the low frequency large amplitude vibration. The anti-vibration effect is configured to be more effective.

  In the present embodiment, as described above, in particular, the holding portion 80 and the pressure receiving chamber 44 or the equilibrium chamber are provided in the respective outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80 in the partition member 42. A plurality of through-holes 76, 66 communicating with 46 are provided, and they are positioned at a predetermined distance from each other in the circumferential direction of the outer peripheral portion of the movable plate 52 held by the holding portion 80.

  Therefore, the movable plate 52 is moved downward (equilibrium chamber 46 side) by the input of the low-frequency large-amplitude vibration, and its outer peripheral portion is brought into contact with the outer peripheral portion 83 of the lower bottom wall portion of the holding portion 80. In this case, fluid is caused to flow from the pressure receiving chamber 44 into the holding portion 80 through the through holes 76 provided in the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80, while the fluid in the holding portion 80 is allowed to flow. Then, it flows out into the equilibrium chamber 46 through each through hole 66 provided in the outer peripheral portion 83 of the lower bottom wall portion. At this time, a portion of the outer peripheral portion of the movable plate 52 facing the through holes 76 in the holding portion 80 is pressed by the fluid flowing into the holding portion 80 and is elastically deformed, thereby the holding portion. It comes into contact with the outer peripheral portion 83 of the lower bottom wall portion of the holding portion 80 earlier than a portion that does not correspond to each through-hole 76 of 80.

  On the other hand, at the time of inputting the low frequency large amplitude vibration, the movable plate 52 is moved upward (the pressure receiving chamber 44 side), and the outer peripheral portion thereof is brought into contact with the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80. At this time, due to the fluid flow opposite to the above, the portion of the outer peripheral portion of the movable plate 52 facing the through holes 66 in the holding portion 80 is elastically deformed to face the through holes 66. It comes into contact with the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80 earlier than the portion that is not.

  That is, in the engine mount of this embodiment, the outer peripheral portion of the movable plate 52 is partially elastically deformed on the circumference when a large amplitude vibration in a low frequency range such as an engine shake is input, and the outer periphery of the movable plate 52 is The timing at which the portion contacts the outer peripheral portions 81 and 83 of the holding portion 80 varies in the circumferential direction of the movable plate 52 and is configured to be non-uniform. In other words, the outer peripheral portion of the movable plate 52 is prevented from being simultaneously brought into contact with the outer peripheral portions 81 and 83 of the holding portion 80 over the entire periphery. As a result, the impact force generated by the contact of the outer peripheral portion of the movable plate 52 with the outer peripheral portions 81 and 83 of the holding portion 80 can be reduced as much as possible.

  In this case, in particular, at the time of inputting such a low frequency and large amplitude, simultaneous contact over the entire outer periphery of the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding unit 80 is further prevented. In order to more effectively reduce the force, the maximum opening width of each of the through holes 76 and 66 provided in the outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80 (FIGS. 4 and 6 (the dimension indicated by W in FIG. 6) and the distance between the through holes 76 and 66 adjacent to each other in the circumferential direction of the movable plate 52 (the dimension indicated by L in FIGS. 4 and 6) (W / L) is set to a value within a range of 1/16 to 1/2.

  This is because when the ratio (W / L) is smaller than 1/16, the number of the through holes 76 and 66 provided in the outer peripheral portions 81 and 83 of the holding unit 80 is too small, and the through holes 76 and 66 are not provided. This is because the effects that can be achieved by forming the film cannot be enjoyed effectively.

  Further, when the ratio (W / L) is larger than 1/2, an excessively large number of through-holes are formed on the outer peripheral portions 81 and 83 of the upper and lower bottom wall portions of the holding portion 80. 76 and 66 are formed, so that when the movable plate 52 moves in the vertical direction, the fluid is caused to flow into the holding portion 80 from the pressure receiving chamber 44 and the equilibrium chamber 46 from many locations, Accordingly, the entire movable plate 52 is pressed in the vertical direction by such a fluid flow action. As a result, there is a high possibility that the outer peripheral portion of the movable plate 52 is simultaneously brought into contact with the outer peripheral portions 81 and 83 of the holding portion 80 over the entire periphery.

  In addition, when the ratio (W / L) is too large, exceeding 1/2, the maximum opening width (W) of each through hole 76, 66 is inevitably large. The effect of reducing the impact force generated by the contact of the outer peripheral portion of the movable plate 52 with the outer peripheral portions 81 and 83 of the holding portion 80 obtained by reducing the maximum opening width (W) of each of the through holes 76 and 66 is sufficient. It can no longer be secured. That is, here, since the maximum opening width (W) of each through hole 76, 66 is relatively small, when the movable plate 52 is moved, the through hole 76, 66 located on the front side in the moving direction is used. The flow resistance of the fluid is increased, so that the impact force caused by the contact of the outer peripheral portion of the movable plate 52 with the outer peripheral portions 81 and 83 of the holding portion 80 is reduced. If / L) is a large value exceeding 1/2, such a reduction in impact force cannot be achieved sufficiently.

  On the other hand, in the engine mount of the present embodiment, the fluid flow path including the plurality of through holes 82 of the partition member 42 is tuned to a frequency region higher than the tuning frequency of the orifice passage 78, thereby causing a traveling boom noise or the like. When a high-frequency small-amplitude vibration is input, the orifice passage 78 is substantially closed as the flow resistance of the orifice passage 78 is significantly increased, while the movable plate 52 is moved in a small amount in the vertical direction. You can move it with. At this time, the fluid is caused to flow around the movable plate 52, so that an effective anti-vibration effect is exhibited. In addition, since the movement of the movable plate 52 in the vertical direction is sufficiently small, the movable plate 52 contacts the radial and ring-shaped ribs 72, 64, 74, 65 provided in the holding unit 80. Therefore, the generation of abnormal noise is not a problem.

  As described above, in the present embodiment, the outer peripheral portion of the movable plate 52 contacts the outer peripheral portions 81 and 83 of the holding portion 80 at the time of vibration input, particularly when large amplitude vibration is input in a low frequency range such as engine shake. The impact force generated at the time is reduced easily and reliably, thereby causing the occurrence of the impact caused by the contact of the outer peripheral portion of the movable plate 52 with the outer peripheral portions 81 and 83 of the holding portion 80. The vibration force can also be advantageously reduced.

  Therefore, in such an engine mount according to the present embodiment, the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding portion 80 of the partition member 42 at the time of inputting a large amplitude vibration in a low frequency region such as an engine shake. Due to the contact of the outer peripheral portion, it is possible to reliably prevent the partition member 42 and the like from resonating and generating abnormal noise. Moreover, it can be realized in a simple structure that is easy to design by simply providing the through holes 76 and 66 in the holding portion 80 of the partition member 42.

  In this embodiment, for example, even when shocking large-amplitude vibration is input, simultaneous contact over the entire circumference of the outer peripheral portion of the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding portion 80 is performed. Accordingly, the outer peripheral portion of the movable plate 52 can be prevented from contacting the outer peripheral portions 81 and 83 of the holding portion 80 of the partition member 42 with a large impact force as much as possible. As a result, the occurrence of shocking sounds and vibrations can be effectively eliminated.

  Further, in the engine mount of the present embodiment, since the protrusions 84 are provided on both surfaces of the outer peripheral edge of the movable plate 52, large amplitude vibration in a low frequency region such as engine shake or shocking large amplitude is provided. At the time of vibration input, the movable plate 52 comes into contact with the outer peripheral portions 81 and 83 of the holding portion 80 at a limited and sufficiently small portion where only the protrusion 84 is limited. Mitigation of impact force by contact of the movable plate 52 with each bottom wall portion of the portion 80 can be advantageously achieved.

  Furthermore, in such an engine mount, the through holes 76, 66 are located in the immediate vicinity of the outer peripheral portions 81, 83 of the holding portion 80 in the partition member 42, on the inner side of the protrusion 84 forming portion on both surfaces of the movable plate 52. Therefore, the fluid that has flowed into the holding portion 80 through each of the through holes 76 and 66 is blocked by the ridges 84 and along the outer peripheral portion of the movable plate 52. Easily flowing in the radial direction is prevented, so that the outer peripheral portion of the movable plate 52 can be efficiently pressed by such fluid. As a result, the timing at which the outer peripheral portion of the movable plate 52 contacts the outer peripheral portions 81 and 83 of the holding portion 80 is more reliably non-uniform on the periphery of the movable plate 52. Therefore, it is possible to effectively prevent the generation of abnormal noise during vibration input.

  Further, in the present embodiment, the inner peripheral surfaces of the through holes 76 and 66 are gradually increased from the holding unit 80 side toward the pressure receiving chamber 44 side or from the holding unit 80 side toward the equilibrium chamber 46 side. Since the diameter of the tapered surface is increased, the flow of the fluid that is caused to flow from the inside of the pressure receiving chamber 44 or the equilibrium chamber 46 toward the holding portion 80 through the through holes 76 and 66 at the time of vibration input. Can be done more smoothly. Also by this, prevention of simultaneous contact over the entire circumference of the outer peripheral portion of the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding portion 80 and further reduction of the impact force caused thereby can be achieved more effectively.

  Furthermore, in this embodiment, since the movable plate 52 is formed of a rubber material and can be elastically deformed, a plurality of locations on the circumference are thick due to the fluid flow action through the through holes 76 and 66. It can be easily elastically deformed in the vertical direction. This also effectively prevents the simultaneous contact of the outer peripheral portions 81 and 83 of the holding portion 80 over the entire outer periphery of the movable plate 52 and further reduces the impact force caused thereby. is there.

  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 regarding this Embodiment.

  For example, in the above-described embodiment, the first fluid chamber is configured by the pressure receiving chamber 44 in which a part of the wall portion is configured by the main rubber elastic body 14 and the internal pressure fluctuation is caused when the vibration is input. The two fluid chambers are configured by the equilibrium chamber 46 in which a part of the wall portion is configured by the diaphragm 38 and the volume change is easily allowed. However, the first fluid chamber, the second fluid chamber, May be formed in a structure that is simply partitioned by a partition member and communicated through a through hole. In that sense, there is no problem even if the orifice passage 78 provided in the partition member 42 is omitted.

  Further, the structure of the partition member 42 is not limited to the illustrated one, and the first fluid chamber and the second fluid chamber are defined in the vibration isolator, and the movable plate is provided. As long as it can be held so as to be freely movable by a certain distance and a through-hole communicating with the holding portion and the first fluid chamber or the second fluid chamber can be formed, for example, one You may comprise only components (member), and may comprise it combining 3 or more components (member). Of course, the specific structure is not limited in any way.

  Further, the movable plate 52 can be formed using a material other than a rubber material.

  Furthermore, in the above embodiment, the through holes 76 and 66 formed in the holding portion 80 of the partition member 42 are each configured to have a tapered inner peripheral surface. For example, FIG. As shown, each through-hole 76, 66 may be formed with an inner peripheral surface having a cylindrical surface shape, or each through-hole with an inner peripheral surface of a shape other than the cylindrical surface shape or the tapered surface shape. Holes 76 and 66 can also be formed. 9 and FIG. 10 to be described later, members and parts having the same structure as in the above-described embodiment are denoted by the same reference numerals as in FIGS. 1 to 8, and detailed description thereof is omitted.

  In the embodiment, the maximum opening widths (W) of the through holes 76 and 66 are all the same, and the distances (L) between adjacent ones in the circumferential direction are all constant. However, for example, as shown in FIG. 10, the maximum opening widths (W) of adjacent ones of the through holes 76 and 66 are different from each other, or the adjacent through holes 76 and 66 are adjacent to each other. The distance (L) between them may be different from each other. As a result, simultaneous contact over the entire outer periphery of the movable plate 52 with respect to the outer peripheral portions 81 and 83 of the holding portion 80 can be prevented, and the impact force caused thereby can be reduced more effectively.

  When the maximum opening widths (W) of the adjacent through holes 76 and 66 are different from each other, only between those provided on the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80, It is made different, or it is made to differ only between what is provided in the outer peripheral part 83 of the lower bottom wall part of the holding | maintenance part 80, or the upper bottom wall part of those holding | maintenance parts 80 You may make it mutually differ in both between what is provided in the outer peripheral part 81, and between those provided in the outer peripheral part 83 of a lower bottom wall part. Further, even when the maximum opening width (W) between the adjacent through holes 76 and 66 is different from each other, the outer peripheral portion 81 of the upper bottom wall portion of the holding portion 80 and the lower bottom wall are provided. When four or more through holes 76 and 66 are provided in the outer peripheral portion 83 of each part, the through holes 76 and 66 that are not adjacent to each other have the same maximum opening width (W). However, there is no problem. The same applies to the case where the distances (L) between the adjacent through holes 76 and 66 are different from each other.

  Furthermore, it goes without saying that the number, shape, size, and the like of the through holes 82 provided in the partition member 42 are not limited to those shown in the embodiment.

  In addition, a specific example of applying the present invention to an engine mount of an automobile has been shown.However, the present invention is also applied to a fluid-filled vibration isolator used in various apparatuses other than an automobile body mount and an automobile. Of course, either can be applied advantageously.

  In addition, although not enumerated one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements, etc. 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 longitudinal cross-sectional explanatory drawing which shows one Embodiment of the fluid enclosure type vibration isolator which has a structure according to this invention. FIG. 2 is an explanatory top view of the fluid filled type vibration damping device shown in FIG. 1. It is a longitudinal cross-sectional explanatory drawing which shows an example of the partition member main body which comprises the partition member with which the fluid enclosure type vibration isolator shown by FIG. 1 is mounted | worn. FIG. 4 is an upper surface explanatory view of the partition member main body shown in FIG. 3. FIG. 2 is a longitudinal cross-sectional explanatory view showing an example of a lid that constitutes a partition member mounted on the fluid filled type vibration damping device shown in FIG. 1. FIG. 6 is an upper surface explanatory view of the lid shown in FIG. 5. FIG. 2 is a longitudinal cross-sectional explanatory view showing an example of a partition member attached to the fluid filled type vibration damping device shown in FIG. 1. FIG. 8 is an upper surface explanatory view of the partition member shown in FIG. 7. It is a figure corresponding to FIG. 7 which shows another example of the partition member with which the fluid filled type vibration isolator shown by FIG. 1 is mounted | worn. It is a figure corresponding to FIG. 8 which shows another example of the partition member with which the fluid-filled type vibration isolator shown in FIG. 1 is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st mounting bracket 12 2nd mounting bracket 14 Main body rubber elastic body 38 Diaphragm 40 Fluid chamber 42 Partition member 44 Pressure receiving chamber 46 Equilibrium chamber 48 Partition member main body 50 Cover body 52 Movable plate 62,70 Through-hole 66,76 Through Hole 78 Orifice passage 80 Holding part 81, 83 Outer peripheral part 82 Through hole 84 Projection

Claims (9)

The first attachment member and the second attachment member are connected by a main rubber elastic body, and the main rubber elastic body is used as a part of a wall portion to form a first fluid chamber in which an incompressible fluid is enclosed. In addition, a second fluid chamber in which an incompressible fluid is sealed is formed on the opposite side of the first fluid chamber with a partition member in between. And a through-hole that allows the second fluid chamber to communicate with each other, a movable plate capable of blocking the through-hole is disposed so as to cover the whole through-hole, and an outer peripheral portion of the movable plate is accommodated Both sides of the outer peripheral portion of the movable plate extending along the outer peripheral portion, and allowing the movable plate to freely move by a fixed distance between the first fluid chamber and the second fluid chamber. In a fluid-filled vibration isolator provided with a holding portion provided with a wall portion positioned opposite to the outer peripheral portion,
A through-hole communicating with the inside of the holding portion and the first fluid chamber or the second fluid chamber is provided in each of the opposing wall portions of the holding portion provided in the partition member, in the circumferential direction of the movable plate. Are provided at a predetermined distance from each other and between the through hole and the outer peripheral edge of the movable plate, and the maximum opening width (W) of the through hole and the circumferential direction of the movable plate A fluid filled type vibration damping device, characterized in that a ratio (W / L) of a distance (L) between adjacent through holes is 1/16 to 1/2.   The fluid-filled vibration isolator according to claim 1, wherein an orifice passage that communicates the first fluid chamber and the second fluid chamber is provided with respect to the partition member.   The fluid-filled vibration isolator according to claim 1 or 2, wherein protrusions extending continuously in the circumferential direction are integrally provided on both surfaces of the outer peripheral end of the movable plate.   4. The fluid-filled type according to claim 3, wherein the plurality of through holes are provided in each of the opposing wall portions of the holding portion so as to be located on an inner side of the projecting portion of the movable plate. Anti-vibration device.   5. The fluid filled type vibration damping device according to claim 1, wherein the plurality of through holes are provided in mutually corresponding portions of the opposing wall portions of the holding portion. .   An opening portion of the through hole that opens to the first fluid chamber side or the second fluid chamber side has a larger diameter than an opening portion that opens to the holding portion side. Each inner peripheral surface has a tapered inner peripheral surface that gradually increases in diameter from the holding portion side to the first fluid chamber side or from the holding portion side to the second fluid chamber side. The fluid-filled vibration isolator according to any one of claims 1 to 5.   The fluid-filled vibration isolator according to any one of claims 1 to 6, wherein the maximum opening width (W) of adjacent ones of the through holes is different from each other.   The fluid-filled vibration isolation system according to any one of claims 1 to 7, wherein distances (L) between mutually adjacent through holes in the circumferential direction of the movable plate are different from each other. apparatus. The fluid-filled vibration isolator according to any one of claims 1 to 8, wherein the movable plate is made of an elastically deformable material.

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