JP2006258215A - Fluid sealed type vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealed type vibration control device capable of certainly preventing generation of noise at input of vibration. <P>SOLUTION: A through hole 74 for communicating two fluid chambers 44, 46 with each other is provided on a partition member 42 and a movable plate 76 capable of shutting off the whole of the through hole 74 are movably arranged between the two fluid chambers 44, 46. Further, movement restriction parts 90, 92 for restricting movement of the movable plate 76 while contacting with an outer peripheral part of the movable plate 76 are provided at both sides of the outer peripheral part of the movable plate 76. Further, at least thickness of the outer peripheral part of the movable plate 76 is continuously varied over the whole periphery in a circumferential direction. <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, with the main rubber elastic body as a part of the wall portion, a first fluid chamber in which an incompressible fluid is sealed is formed, and a partition member is interposed between the first fluid chamber and the first fluid chamber. While forming the second fluid chamber in which the incompressible fluid is sealed, the partition member is provided with a through hole that allows the first and second fluid chambers to communicate with each other. A movable plate capable of blocking the through hole so as to cover the whole is disposed so as to be movable between the first fluid chamber and the second fluid chamber, and the movable plate is provided on both sides of the outer peripheral portion of the movable plate. There is known a fluid-filled vibration isolator provided with a movement restricting portion that contacts the outer peripheral portion of the plate and restricts the movement of the movable plate. There.

  In the fluid-filled vibration isolator having such a structure, the movable plate is moved by the input of vibration, and the first fluid chamber and the second through the through-hole are moved along with the movement of the movable plate. Based on the fluid flow action of fluid flowing between the fluid chambers, it is possible to easily obtain a vibration isolation effect that is difficult to obtain with a rubber elastic body alone. Application is under consideration.

  By the way, in such a vibration isolator, when the movable plate is moved between the first fluid chamber and the second fluid chamber, the movable plate is brought into contact with the movement restricting portion provided in the partition member. Although the amount of movement of the movable plate is regulated, an excitation force is generated due to the impact force generated by the contact of the movable plate with the movement regulating portion, and as a result, the partition member and There is a problem that abnormal noise occurs due to resonance of other members that come into contact. When a shocking heavy load is input, the movable plate strongly hits the movement restricting portion of the partition member, so that a larger abnormal noise including a hitting sound is generated. It was a particularly 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, ribs having different lengths are provided at the bottom (movement restricting portion) of one partition constituting the partition member. For this reason, when the movable plate is moved 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 reduced. The entire movable plate is advantageously made smaller than the case where the entire movable plate contacts the partition member at the same time. 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, in order to obtain a sufficient noise prevention effect, the length difference between the ribs is set to an appropriate value. There was a problem that the length had to be designed and it was extremely troublesome. In addition, in such a 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. It also had the disadvantage that it was difficult to ensure a sufficient sealing property with the body.

  In addition, as another countermeasure for preventing the occurrence of abnormal noise, a fluid-filled vibration isolator having a movable plate having a special structure has been proposed (see, for example, Patent Document 2 below).

  That is, in such a vibration isolator, the movable plate is made of a disc-shaped rubber film. A plurality of annular first ribs extending in the circumferential direction and a plurality of second ribs extending radially in the radial direction are integrally provided on both surfaces of the movable plate with the same width and height. ing. In the fluid-filled vibration isolator having such a movable plate, the impact generated when the movable plate is moved and brought into contact with the movement restricting portion by the input of the vibration load is a plurality of first vibrations. Absorbed by the rib and the second rib, the movable plate is brought into soft contact with the movement restricting member, thereby preventing the generation of abnormal noise.

  However, even in the conventional fluid-filled vibration isolator as described above, the height and width of the annular first rib and the radial second rib or The formation position, etc. must be designed to be the optimum value or position. Therefore, as with the conventional vibration isolator having a special structure of the partition member as described above, the troublesome design work is required. The problem of being necessary was inherent.

Japanese Patent No. 2875723 Japanese Patent Laid-Open No. 20005-3184

  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.

  And in this invention, in order to solve this subject, while connecting a 1st attachment member and a 2nd attachment member with a main body rubber elastic body, this main body rubber elastic body is a part of wall part. Forming a first fluid chamber in which an incompressible fluid is enclosed, and further a second member in which an incompressible fluid is enclosed on the opposite side of the first fluid chamber with a partition member interposed therebetween. While forming the 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 further, the through hole is blocked so as to cover the entire through hole. A movable plate capable of moving between the first fluid chamber and the second fluid chamber, and in contact with the outer peripheral portion of the movable plate on both sides of the outer peripheral portion of the movable plate. In the fluid-filled vibration isolator provided with a movement restricting portion that restricts the movement of the movable plate, a small amount of the movable plate is provided. Both the thickness of the outer peripheral portion, the fluid filled vibration damping device, characterized in that it is continuously caused to vary in the circumferential direction over the entire circumference, it is an gist thereof.

  In the fluid filled type vibration damping device according to the present invention, the thickness of at least the outer peripheral portion of the movable plate is continuously changed in the circumferential direction over the entire circumference. When moving between the first fluid chamber and the second fluid chamber by the input of the vibration load, the thicker part of the outer peripheral part is brought into contact with the movement restricting part sooner. On the other hand, the thinner the portion, the slower the contact with the movement restricting portion.

  As a result, the timing at which the outer peripheral portion of the movable plate contacts the movement restricting portion at the time of vibration input becomes nonuniform on the periphery of the outer peripheral portion of the movable plate. On the other hand, it can be advantageously avoided that the entire circumference is contacted simultaneously. As a result, the impact force generated by the contact of the outer peripheral portion of the movable plate with the movement restricting portion is advantageously made smaller than when the entire movable plate contacts the partition member simultaneously.

  In addition, in the fluid filled type vibration damping device according to the present invention, in order to prevent the outer peripheral portion of the movable plate from being simultaneously brought into contact with the movement restricting portion over the entire circumference, simply at least the movable plate. The thickness of the outer peripheral portion is merely changed in the circumferential direction, and basically, such a change amount of the thickness is not specified in a specific range.

  Therefore, for example, the bottom of one partition as the movement restricting portion is provided with ribs having ridge shapes having different lengths with a predetermined difference, or at predetermined positions on both surfaces of the movable plate. Unlike conventional devices having a structure in which an annular rib or a radial rib having a length or a width is provided, simultaneous contact over the entire outer periphery of the movable plate with respect to the movement restricting portion is troublesome. It can be reliably avoided without requiring design work.

  Therefore, in the fluid-filled vibration isolator according to the present invention as described above, the vibration force generated due to the impact force generated by the contact of the outer peripheral portion of the movable plate with the movement restricting portion at the time of vibration input is easy. And can be reliably reduced. As a result, it is possible to more easily and more reliably prevent the generation of abnormal noise accompanying the contact of the movable plate with the movement restricting portion. 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.

  Moreover, in the device of the present invention, since the thickness of at least the outer peripheral portion of the movable plate is merely different in the circumferential direction, the structure of the partition member in which the movable plate is movably disposed, etc. No changes are made to the structure of the part that may affect the vibration isolation characteristics. Therefore, it is possible to obtain the advantage that the effect of generating the abnormal noise as described above can be enjoyed very effectively while maintaining the vibration-proof performance advantageously.

Aspects of the Invention

  By the way, the present invention can be suitably implemented at least in various aspects as listed below.

(1) The first fluid in which the first attachment member and the second attachment member are connected by the main rubber elastic body, and the main rubber elastic body is used as a part of the wall portion and incompressible fluid is enclosed. Forming a chamber and further forming a second fluid chamber in which an incompressible fluid is sealed on the opposite side of the first fluid chamber with a partition member in between, The first fluid chamber and the first fluid chamber are provided with a through hole that allows the first and second fluid chambers to communicate with each other, and further, the movable plate capable of blocking the through hole so as to cover the entire through hole. A movement restricting portion is provided on both sides of the outer peripheral portion of the movable plate so as to be in contact with the outer peripheral portion of the movable plate so as to restrict the movement of the movable plate. In the fluid-filled vibration isolator, the thickness of at least the outer peripheral portion of the movable plate is in the circumferential direction over the entire circumference. Fluid filled type vibration damping device, characterized in that it is continuously caused to vary.

(2) In the above aspect (1), an orifice passage that communicates the first fluid chamber and the second fluid chamber is provided for the partition member. In a fluid-filled vibration isolator having such an orifice passage, by tuning the orifice passage to a low frequency region such as an engine shake, for example, when such a low frequency large amplitude vibration is input, An effective anti-vibration effect is exhibited based on the resonance action of the fluid flowing through the orifice passage. In addition, the input of such low-frequency large-amplitude vibrations can reliably reduce the impact force that occurs when the contact portion of the movable plate comes into contact with the movement restricting portion of the partition member. Generation of abnormal noise at the time of vibration input can be effectively prevented.

(3) In the above aspect (1) or aspect (2), at least the outer peripheral portion of at least one surface of the movable plate is from one side in one direction perpendicular to the plate thickness direction of the movable plate to the other. The thickness of at least the outer peripheral portion of the movable plate in the circumferential direction over the entire circumference by being inclined so as to gradually approach the other surface of the movable plate. It can be changed continuously.

  According to such a configuration, the structure of the movable plate in which at least the thickness of the outer peripheral portion is gradually changed in the circumferential direction can be easily realized. Further, in such a fluid-filled vibration isolator having a movable plate, fluid is allowed to flow between the first fluid chamber and the second fluid chamber through the through-holes by the input of an impact load. Of the movable plate having an inclined surface, the plate surface portion on the thick wall side is faster than the plate surface portion on the thin wall side of the movable plate so that the fluid flow pressure is applied. become. As a result, the thick part of the movable plate is brought into contact with the movement restricting part earlier than the thin part, so that the simultaneous contact over the entire circumference of the outer peripheral part of the movable plate with respect to the movement restricting part is Furthermore, it can be reliably prevented. And as a result, generation | occurrence | production prevention of the noise accompanying the contact of the movable plate with respect to a movement control part can be implement | achieved still more reliably.

(4) In the above-described aspect (1) or optimal aspect (2), at least an outer peripheral portion of at least one surface of the movable plate is gradually reduced in diameter toward one side in the plate thickness direction of the movable plate, and The thickness of the at least the outer peripheral portion of the movable plate is such that the angle formed by the bus bar and the central axis of the movable plate is a tapered surface that continuously changes in the circumferential direction over the entire circumference. It can be changed continuously in the circumferential direction over the entire circumference.

  In the fluid-filled vibration isolator having such a movable plate, the thickness of the portion where the outer peripheral portion of the movable plate is located inside is increased. Therefore, when the movable plate is moved by the input of the vibration load and the outer peripheral portion of the movable plate is brought into contact with the movement restricting portion, the outer peripheral portion of the movable plate is swollen by the fluid flow through the through hole. Therefore, it is possible to prevent or suppress as much as possible that the contact state between the outer peripheral portion of the movable plate and the movement restricting portion is partially eliminated. That is, in other words, the fluid flow through the through hole can be more effectively prevented under the contact state of the movable plate with the movement restricting portion.

  Therefore, when such a mode (4) is employed together with the configuration according to the above-described mode (2), for example, when a low frequency large amplitude vibration such as an engine shake is input, Since the fluid flow through the through hole can be extremely effectively prevented, the vibration isolation effect based on the resonance action of the fluid flowing through the orifice passage can be more effectively exhibited.

(5) In any one of the above-described aspects (1) to (4), at least the outer peripheral part of the movable plate extends from the outer peripheral edge toward the central part, and the outer peripheral part extends in the circumferential direction. A plurality of cuts are provided at a predetermined distance in the circumferential direction.

  In the fluid-filled vibration isolator having such a movable plate, when an impact load is input, the fluid is allowed to flow between the first fluid chamber and the second fluid chamber through the through hole. In addition, due to the fluid pressure of the fluid, the portion of the outer peripheral portion of the movable plate that is adjacent to each other in the circumferential direction is deformed or displaced independently. And the deformation amount or the displacement amount is not exactly the same, and a slight difference occurs between them. As a result, the timing at which the outer peripheral portion of the movable plate contacts the movement restricting portion can be made more uneven on the periphery of the outer peripheral portion of the movable plate. Simultaneous contact over the entire circumference is advantageously avoided, so that the impact forces that occur can be reduced effectively. In addition, since the fluid is allowed to flow through each of the cut portions, the flow pressure of the fluid acting on the movable plate is effectively reduced, and this also causes the outer peripheral portion of the movable plate to become a movement restricting portion. Mitigation of the impact forces that occur when brought into contact can be advantageously achieved. As a result of these, it is possible to more reliably prevent the occurrence of abnormal noise accompanying the contact of the movable plate with the movement restricting portion.

(6) In the above-described aspect (5), the distances between the cuts adjacent to each other in the circumferential direction of the movable plate are different from each other. According to such a structure, the magnitude | size for every part between the notch parts mutually adjacent to the circumferential direction among the outer peripheral parts of a movable plate can be made mutually different. Therefore, when the fluid is caused to flow between the first fluid chamber and the second fluid chamber through the through holes by the input of the impact load, each of the movable plates is independently displaced or deformed. There is a greater difference in the amount of displacement or deformation for each part between the cuts in the outer peripheral part, thereby further avoiding simultaneous contact over the entire periphery of the outer peripheral part of the movable plate with respect to the movement restricting part. Can be done. As a result, the generation of abnormal noise accompanying the contact of the movable plate with the movement restricting portion can be prevented more reliably.

(7) In any one of the above aspects (1) to (6), the movable plate is made of an elastically deformable material. In the fluid-filled vibration isolator having such a movable plate, it is based on the flow action of the fluid that is circulated between the first fluid chamber and the second fluid chamber through the through hole when vibration is input. 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. Further, since the soft spring characteristic can be exhibited in the thinned portion of the movable plate, when the movable plate is moved by the input of the vibration load, such a thin portion of the movable plate is more The impact caused by the soft contact can be reduced even more effectively. Therefore, the generation of noise due to the contact of the movable plate with the movement restricting portion in the partition member can be further advantageously 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. Further, an inverted taper-shaped reinforcing metal fitting 29 is embedded in an intermediate portion of the main rubber elastic body 14 in the height direction to prevent buckling deformation and the like.

  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.

  Further, the partition member 42 that divides the fluid chamber 40 into two to define the pressure receiving chamber 44 and the equilibrium chamber 46 is formed by the partition member main body 48 and the lid 50 being overlapped and assembled. ing.

  As shown in FIGS. 3 and 4, the partition member main body 48 is formed of a substantially circular block body having a predetermined thickness formed using a hard synthetic resin material or a metal material such as an aluminum alloy. . Further, in the outer peripheral portion of the upper surface of the partition member main body 48, a circumferential groove 52 having a rectangular cross section extending continuously in a double-folded manner has a predetermined depth in the region of the substantially 4/5 circumferential portion. Is formed. In the circumferential groove 52, a window portion 54 having a substantially rectangular shape is formed at one end portion of the bottom portion extending in the circumferential direction so as to penetrate the bottom portion.

  Further, a circular recess 56 having a predetermined depth and having a smooth inner bottom surface is surrounded by a circumferential groove 52 on the inner peripheral portion of the upper surface of the partition member body 48. Yes. Further, a plurality (three in this case) of positioning pins 53 are integrally provided between the circular recess 56 and the circumferential groove 52 at a constant interval in the circumferential direction. At the bottom of the circular recess 56, for example, four through holes 58a having a fan shape are provided at the center of the circular recess 56 at a constant distance from each other in the circumferential direction. Around the hole 58a, for example, eight through holes 58b having a rectangular shape are spaced apart from each other in the circumferential direction by a predetermined distance and predetermined in the radial direction with respect to the four through holes 58a located inside thereof. Are formed at a distance of. Of the total twelve through-holes 58, ribs 60 extending radially and circularly are provided between adjacent ones in the circumferential direction and the radial direction. In FIGS. 3 and 4, reference numeral 62 denotes a hollow portion formed for the purpose of reducing the weight of the partition member main body 48.

  On the other hand, as is apparent from FIGS. 1, 5, and 6, the lid 50 is formed of a circular thin-walled flat plate formed using a metal material such as a hard synthetic resin material or an aluminum alloy, and the partition member body 48. The both sides of the thickness direction are smooth surfaces. A rectangular notch 64 is provided at one position on the outer peripheral edge of the lid 50, and a plurality of (here, three) pin holes are provided on the outer peripheral part. 66 are provided at positions corresponding to the plurality of positioning pins 53 provided on the partition member main body 48, respectively.

  Further, for example, one circular through hole 68a is provided at the center of the inner peripheral portion of the lid 50, and a rectangular shape is formed around the circular through hole 68a, for example, 8 The individual through holes 68b are formed at a predetermined distance in the radial direction with respect to the through holes 68a in a state of being spaced apart from each other by a certain distance in the circumferential direction and surrounding the circular through holes 68a. Furthermore, among these nine through holes 68, the circular through hole 68 a located at the center is four fan-shaped through holes provided at the center of the bottom of the circular recess 56 of the partition member body 48. 58a and four ribs 60 provided between the four through holes 58a have a combined size and are arranged so as to correspond to them. Further, the eight rectangular through holes 68b have the same size as the eight rectangular through holes 58b provided on the outer peripheral portion of the bottom of the circular recess 56 of the partition member body 48, and are positioned so as to correspond to them. It is arranged. Further, ribs 70 extending radially and circularly are formed between a total of nine such through holes 58.

  7 and 8, a plurality of positioning pins 53 erected on the partition member body 48 are inserted into the plurality of pin holes 66 of the lid 50 having the above-described structure. In the positioned state, the lid 50 is superimposed on the partition member main body 48 so as to cover the circular recess 56 and assembled. Further, under such an assembled state, one circular through hole 68a in the lid 50 is positioned corresponding to the four fan-shaped through holes 58a in the partition member main body 48, and the lid 50 The eight rectangular through holes 68b are respectively positioned corresponding to the eight rectangular through holes 58b in the partition member body 48. Further, the notch 64 of the lid 50 is positioned corresponding to one end of the circumferential groove 52 provided in the partition member main body 48.

  Thus, the partition member 42 is configured as an assembly of the partition member main body 48 and the lid body 50. And the accommodating part 72 in which the circular recessed part 56 of the partition member main body 48 is covered with the cover body 50 is formed in the inner peripheral part (center part) of such a partition member 42. That is, the accommodating portion 72 is formed from the smooth upper surface of the lower bottom wall portion provided with twelve through holes 58 and the inner peripheral portion of the lid body 50, which are formed from the bottom portion of the circular recess 56 in the partition member main body 48. The upper bottom wall portion provided with nine through holes 68 is surrounded by the smooth bottom surface and the side surface of the circular recess 56.

  In the accommodating portion 72, the four fan-shaped through holes 58a of the partition member main body 48 and the one circular through hole 68a of the lid body 50, which are positioned corresponding to each other, A through hole 74a penetrating the peripheral portion (center portion) is formed. Further, the eight through holes 58b of the partition member main body 48 and the eight through holes 68b of the lid body 50 that are positioned to correspond to each other are used to form the through holes 74a in the inner peripheral portion (center portion) of the partition member 48. Eight through holes 74b penetrating the part around the formation site are formed at a certain distance from each other in the circumferential direction.

  As a result, nine through holes 74 are provided in the accommodating portion 72 of the partition member main body 48, and the internal space of the accommodating portion 72 is communicated to the outside through each of the through holes 74. Yes. In other words, the upper opening portion of each through hole 74 is composed of nine through holes 68 provided in the upper bottom wall portion of each accommodating portion 72 and twelve through holes 58 provided in the lower bottom wall portion. And the lower opening are formed, and the receiving portions 72 are communicated upward and downward through the upper and lower openings formed by the through holes 68 and 58, respectively.

  As is clear from FIG. 1, the movable plate 76 is housed and held in the housing portion 72 of the partition member 42 configured as described above. Thus, in the present embodiment, the movable plate 76 has a special structure not seen in the prior art, and there are extremely large features.

  That is, as shown in FIGS. 1, 9, and 10, the movable plate 76 has a diameter that is slightly smaller than the inner diameter of the circular recess 56 of the partition member body 48 and the depth dimension of the circular recess 56. It consists of a rubber circular flat plate having a sufficiently small thickness.

  In this case, in particular, one surface (the lower surface in FIG. 9) of the movable plate 76 in the thickness direction is a flat surface 78 that is parallel and smooth to the direction perpendicular to the thickness direction. On the other hand, the other surface (the upper surface in FIG. 9) is inclined so as to gradually approach the flat surface 78 as it goes from one side to the other in one direction perpendicular to the thickness direction. 80. The inclination angle of the inclined surface 80 is not particularly limited.

  Thus, a portion located at one place on the circumference of the outer peripheral edge of the movable plate 76 is the maximum thickness portion 82 having the largest thickness, and is positioned on the opposite side in the radial direction with respect to the maximum thickness portion. The minimum thickness portion 84 where the thickness is the smallest is provided, and the thickness is gradually decreased from the maximum thickness portion 82 toward the minimum thickness portion 84 in the radial direction. As a result, the entire movable plate 76 is configured to be continuously changed in the circumferential direction over the entire circumference.

Further, in the movable plate 76, notches 86 are provided at a plurality of locations (here, 5 locations) on the circumference. The notch 86 extends straight from the outer peripheral edge of the movable plate 76 toward the center, and has a length that reaches the vicinity of the center. Furthermore, among such a plurality of cuts 86, the distance between those adjacent to each other in the circumferential direction, specifically, the distance between the peripheral edges of the cuts 86, 86 adjacent to each other in the circumferential direction. The distance between them (the dimensions indicated by L _{1 to} L ₅ in FIG. 10) is irregularly different.

  Accordingly, here, the outer peripheral portion of the movable plate 76 is divided in the circumferential direction by the respective notches 86, and therefore the notches 86 adjacent to each other in the circumferential direction are arranged on the outer peripheral portion of such a movable plate 76. A plurality of (here, five) tongue pieces 88a to 88e each having an intermediate portion are formed to have irregularly different circumferential lengths. The plurality of tongue pieces 88a to 88e are configured such that the thickness of each of the tongue pieces 88a to 88e can be continuously changed in the circumferential direction, and can be elastically deformed independently of each other. Furthermore, the surface areas of the inclined surface 80 and the flat surface 78 are different from each other.

  Thus, as shown in FIG. 11, the movable plate 76 having such a structure has a flat surface 78 in the accommodating portion 72, and the lower bottom wall portion side of the accommodating portion 72, that is, the partition member main body 48. On the other hand, the inclined surface 80 is disposed on the upper bottom wall portion of the accommodating portion 72, that is, on the inner peripheral portion side of the lid body 50. In such a state, the flat surface 78 covers substantially the entire lower bottom wall portion of the accommodating portion 72, and the upper opening portion and the lower opening portion of each through hole 74 are configured. The partition member main body 48 and the lid body 50 are positioned so as to block between the through holes 58 and 68.

  Thus, here, the movable plate 76 covers all of the plurality of through holes 74 provided in the storage portion 72 and blocks each of the through holes 74 while being accommodated in the storage portion 72. The outer peripheral portion, in other words, the distal end portion of each tongue piece portion 88 is disposed so as to correspond to the outer peripheral portions of the upper and lower bottom wall portions of the accommodating portion 72 in the vertical direction. Further, under such an arrangement state, the movable plate 76 is arranged such that the outer peripheral portion of the inclined surface 80 (the inclined surface 80 portion at the tip portion of each tongue piece portion 88) or the outer peripheral portion of the flat surface 78 (of each tongue piece portion 88). The inside of the housing portion 72 can be freely moved in the vertical direction within a range until the flat surface 78 portion at the tip portion is brought into contact with the outer peripheral portions of the upper and lower bottom wall portions of the housing portion 72. It has become.

  That is, according to this, in this embodiment, the outer peripheral portion of the upper bottom wall portion in the accommodating portion 72 of the partition member 42 comes into contact with the inclined surface 80 portion of the tip portion of each tongue piece portion 88 in the movable plate 76. While the upper movement restricting portion 90 restricts the upward movement of the movable plate 76 at a predetermined position, the outer peripheral portion of the lower bottom wall portion of the accommodating portion 72 is formed by the tongue piece portion 88 of the movable plate 76. The lower movement restricting portion 92 is configured to restrict the downward movement of the movable plate 76 at a predetermined position by contact with the flat surface 78 portion of the distal end portion.

  As shown in FIG. 1, the partition member 42 in which the movable plate 76 having such a structure is accommodated and held is coaxially arranged in the second mounting bracket 12 (fluid chamber 40). While extending in a direction perpendicular to the axis and the lid 50 is positioned on the upper side, the partition member main body 48 is positioned on the lower side, and the upper surface of the annular plate portion 32 of the ring 30 and the main rubber elastic body 14 It is held and fixed between the lower end surfaces.

  In addition, under such a fixed state of the partition member 42 in the fluid chamber 40, the upper bottom wall portion of the accommodating portion 72 in the partition member 42 is exposed in the pressure receiving chamber 44, while the lower side of the partition member 72 The bottom wall portion is exposed in the equilibrium chamber 46, and a plurality of through holes 68 and 58 provided respectively in the upper and lower bottom wall portions of the accommodating portion 72 are provided in the pressure receiving chamber 44 and the equilibrium chamber 46. In addition, each is opened.

  Accordingly, the plurality of through holes 74 provided in the accommodating portion 72 are positioned so as to communicate the pressure receiving chamber 44 and the equilibrium chamber 46, and between the pressure receiving chamber 44 and the equilibrium chamber 46 through the respective through holes 74. The fluid flow at is allowed. In addition, the inclined surface 80 that provides the upper surface of the movable plate 76 accommodated in the accommodating portion 72 and the flat surface 78 that provides the lower surface are exposed to the pressure receiving chamber 44 and the equilibrium chamber 46 through the respective through holes 74. The internal pressures of the pressure receiving chamber 44 and the equilibrium chamber 46 can be exerted on the inclined surface 80 and the flat surface 78.

  Furthermore, under the fixed state of the partition member 42 in the fluid chamber 40, the end portion where the circumferential groove 52 provided in the partition member main body 48 of the partition member 42 is positioned corresponding to the notch 64 of the lid 50. All parts except for are covered with the lower end surface of the main rubber elastic body 14. As a result, the orifice passage 94 is formed in the state in which the orifice passage 94 is communicated with the pressure receiving chamber 44 and the equilibrium chamber 46 through the notch 64 of the lid 50 and the window 54 of the partition member main body 48 with respect to the partition member 42. Therefore, the fluid flow between the pressure receiving chamber 44 and the equilibrium chamber 46 is allowed through the orifice passage 94.

  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 94, the fluid flow through the plurality of through holes 74 between the pressure receiving chamber 44 and the equilibrium chamber 46, and the elastic deformation action of the movable plate 76 are generated. It has become.

  In this case, the orifice passage 94 is tuned to a low frequency region such as an engine shake, so that when a low frequency large amplitude vibration such as an engine shake is input, the fluid is caused to flow through the orifice passage 94. An effective anti-vibration effect is exhibited based on the resonance action.

  At that time, the movable plate 76 held in the accommodating portion 72 of the partition member 42 is moved to the pressure receiving chamber 44 side or the equilibrium chamber 46 side (vertical direction) based on the internal pressure difference between the pressure receiving chamber 44 and the equilibrium chamber 46. ) To be brought into contact with the upper movement restricting portion 90 and the lower movement restricting portion 92 of the accommodating portion 72 at the tip portion of each tongue piece portion 88. As a result, all of the plurality of through holes 68 and 58 provided respectively in the upper bottom wall portion and the lower bottom wall portion of the partition member 42 are closed, and pressure is received through the plurality of through holes 74 in the accommodating portion 72. The substantial fluid flow between the chamber 44 and the equilibration chamber 46 is prevented, so that the vibration isolation effect based on the fluid flow action through the orifice passage 94 can be more effectively exhibited.

  Further, at this time, the contact surface of the accommodating portion 72 with the upper movement restricting portion 90 and the movable plate 76 of the lower movement restricting portion 92 is a smooth surface, and no protrusions are provided. Moreover, the movable plate 76 is made of an elastically deformable rubber material. Therefore, for example, unlike the above-described conventional device in which ribs having a ridge shape are provided at the contact portion of the partition member 42 with the movable plate 76, the tongue pieces 88 of the movable plate 76 are brought into contact with each other. It is possible to effectively prevent a gap from being formed between the upper and lower movement restricting portions 90 and 92 of the housing portion 72 and impairing the sealing performance.

  Furthermore, in the present embodiment, the movable plate 76 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 76 is limited by the contact of the movable plate 76 with the ribs 70 and 60 provided on the lower bottom wall portion. Therefore, it is advantageously prevented that the fluid flow amount through the orifice passage 94 becomes insufficient due to the elastic deformation of the movable plate 76 at the time of inputting the low frequency large amplitude vibration. The anti-vibration effect can be more effectively exhibited.

  In the present embodiment, particularly, as described above, when the movable plate 76 is moved due to the input of the low frequency large amplitude vibration, it contacts the upper movement restricting portion 90 and the lower movement restricting portion 92 of the accommodating portion 72. The upper surface of the movable plate 76 to be crimped is an inclined surface 80, and the thickness of the movable plate 76 is continuously changed in the circumferential direction. Moreover, the outer peripheral part which is a contact part to the upper side and lower side movement control parts 90 and 92 of such a movable plate 76 can be elastically deformed independently from each other, and continuously in the circumferential direction with different circumferential lengths. It is comprised by the several tongue piece part 88a-88e which has the thickness which changes, and a mutually different surface area.

  Therefore, when the movable plate 76 is moved downward (equilibrium chamber 46 side) by the flow of fluid from the pressure receiving chamber 44 side to the equilibrium chamber 46 side due to the input of the low frequency large amplitude vibration, for example. Of the inclined surface 80 of the movable plate 76, the fluid flow pressure is caused to act faster on the thick-side inclined surface 80 portion than on the thin-walled inclined surface 80 portion. That is, the fluid flow pressure is caused to act on the movable plate 76 with a time difference on the circumference thereof, so that the flat surface 78 of the movable plate 76 is moved downward in an inclined state. become.

  At that time, the plurality of tongue pieces 88a to 88e of the movable plate 76 are arranged at positions different from each other in the circumferential direction, so that the sizes of the tongue pieces 88 are different from each other. Is caused to act. Further, each tongue piece 88 has a different surface area of the inclined surface 80 portion on which such a fluid pressure is applied. Thereby, when the movable plate 76 is moved downward by the input of the low frequency large amplitude vibration, the plurality of tongue pieces 88a to 88e of the movable plate 76 are independent from each other and have different sizes. It is elastically deformed to be bent or bent downward.

  On the other hand, when the low-frequency large-amplitude vibration is input, when the movable plate 76 is moved upward (the pressure-receiving chamber 44 side) as the fluid flows from the equilibrium chamber 46 side to the pressure-receiving chamber 44 side, the movable plate 76 is movable. Since the thickness of the plate 76 is continuously changed in the circumferential direction, the thicker portion can be brought into contact with the upper movement restricting portion 90 earlier. Also at this time, the plurality of tongue pieces 88a to 88e of the movable plate 76 are elastically deformed so as to be bent or bent upward independently of each other by the fluid pressure of the fluid applied to the movable plate 76. I'm damned. In addition, since the surface areas of the flat surface 78 portions of the tongue pieces 88 are different in size, the elastic deformation amounts of the tongue pieces 88 are different from each other.

  Thus, in the engine mount of the present embodiment, even if the movable plate 76 is moved in any direction in the vertical direction by the input of large amplitude vibration in a low frequency range such as an engine shake, the movable plate 76 Between the plurality of tongue pieces 88a to 88e, the upper movement restricting portion 90 and the lower movement restricting portion 92 are brought into contact with each other at different timings. Also, the single tongue piece 88 can be brought into contact with the upper movement restricting portion 90 and the lower movement restricting portion 92 at different timings among different portions in the circumferential direction.

  As a result, the timing at which the outer peripheral portion of the movable plate 76 contacts the upper movement restricting portion 90 and the lower movement restricting portion 92 varies in the circumferential direction of the movable plate 76 and is configured to be non-uniform. Thus, the outer peripheral portion of the movable plate 76 is prevented from being simultaneously brought into contact with the upper movement restriction portion 90 and the lower movement restriction portion 92 over the entire circumference. As a result, the impact force generated by the contact of the outer peripheral portion of the movable plate 76 with respect to the upper movement restricting portion 90 and the lower movement restricting portion 92 can be reduced as much as possible.

  Further, here, when the movable plate 76 is moved by the input of the low-frequency large-amplitude vibration, the fluid is also circulated through the notches 86 provided in the movable plate 76, so that the fluid flowing on the movable plate 76 is flowed. The pressure is effectively reduced, and this also advantageously reduces the impact force generated when the outer peripheral portion of the movable plate 76 is brought into contact with the upper movement restricting portion 90 and the lower movement restricting portion 92. obtain.

  Moreover, in this embodiment, the effect of reducing the impact force caused by the contact of the movable plate 76 with the upper movement restricting portion 90 and the lower movement restricting portion 92 of the housing portion 72 is simply one of the movable plates 76. In a structure that does not require any extremely simple and troublesome design work in which the surface is an inclined surface 80 and a plurality of notches 86 are provided at appropriate positions, it is advantageous regardless of the moving direction of the movable plate 76. Can be achieved.

  On the other hand, a plurality of through holes 74 provided in the accommodating portion 72 of the partition member 42 are tuned to a frequency range higher than the tuning frequency of the orifice passage 94, thereby causing high-frequency small amplitude vibration such as traveling boom noise. When the input is made, the flow resistance of the orifice passage 94 is significantly increased, so that the orifice passage 94 is substantially closed, while the movable plate 76 in the accommodating portion 72 moves with a small amount of movement in the vertical direction. It can be moved. At this time, the fluid is caused to flow around the movable plate 76 through the respective through holes 74, so that an effective anti-vibration effect is exhibited. Further, since the movement of the movable plate 76 in the accommodating portion 72 in the vertical direction is sufficiently small, there is no contact of the movable plate 76 with the ribs 60, 70 provided in the accommodating portion 72, and therefore abnormal noise is generated. Will not be a problem.

  As described above, in the present embodiment, when the low frequency large amplitude vibration is input, the outer peripheral portion (each tongue piece portion 88) of the movable plate 76 is connected to the upper movement restricting portion 90 or the lower movement restricting portion 92 of the housing portion 72. The impact force generated when contacting the movable plate 76 is easily and reliably reduced, so that the movable plate 76 contacts the upper movement restricting portion 90 and the lower movement restricting portion 92 of the accommodating portion 72. The vibration force generated due to the above can be advantageously reduced.

  Therefore, in the engine mount according to the present embodiment as described above, the movable plate with respect to the upper movement restricting portion 90 and the lower movement restricting portion 92 of the accommodating portion 72 in the partition member 42 at the time of inputting the low frequency large amplitude vibration. By the contact of 76, it is possible to reliably prevent the partition member 42 and the like from resonating and generating abnormal noise in a simple structure that is easy to design.

  In this embodiment, for example, even when a shocking large amplitude vibration is input, the movable plate 76 moves the upper movement restricting portion 90 or the lower movement restricting portion 92 of the accommodating portion 72 in the partition member 42. On the other hand, it is possible to prevent contact with a large impact force as much as possible, and it is possible to effectively eliminate the generation of shocking sound and vibration.

  Furthermore, in the engine mount of this embodiment, in order to prevent simultaneous contact over the entire circumference of the movable plate 76 with respect to the upper and lower movement restricting portions 90 and 92, one surface of the movable plate 76 is simply inclined. 80, and a plurality of notches 86 are provided at appropriate positions, and no special structure is added to the partition member 42 or other parts or members other than the movable plate 76. . Therefore, the partition member 42 and parts or members that have been used in the past can be used as they are, and the effect of preventing the occurrence of abnormal noise as described above can be achieved very advantageously and easily while maintaining the vibration-proof characteristics. It is.

  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 configuration 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 94 provided in the partition member 42 is omitted.

  Further, the specific structure of the partition member 42 is not limited to the illustrated one, and the first fluid chamber and the second fluid chamber can be defined inside the vibration isolator, If a plurality of movable plates that have a plurality of through holes and are positioned so as to correspond to each of the plurality of through holes have a structure arranged so as to block the through holes, for example, You may comprise only one component (member), and may comprise combining 3 or more components (member).

  Further, the number, shape, and arrangement position of the plurality of through holes 74 provided in the partition member 42 are not limited to those shown in the embodiment.

  Furthermore, in the embodiment, only one surface of the movable plate 76 is the inclined surface 80, so that the thickness of the movable plate 76 is continuously changed in the circumferential direction. 12, the upper surface of the movable plate 76 is the upper inclined surface 80a, and the lower surface is the lower inclined surface 80b, so that the thickness of the movable plate 76 is increased over the entire circumference. Even if it is configured to continuously change in the direction, there is no problem. Of course, when such a configuration is employed, the inclination angles of the upper and lower inclined surfaces 80a and 80b of the movable plate 76 are not particularly limited. In FIG. 12 and FIGS. 13 to 16 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. Omitted.

  As described above, if the upper and lower surfaces of the movable plate 76 are the upper and lower inclined surfaces 80a and 80b, even when the movable plate 76 is moved upward or downward, the movable plate 76 is moved downward. The fluid flow pressure is applied to both the upper inclined surface 80a and the lower inclined surface 80b of the movable plate 76 with a time difference on the circumference thereof, so that the upper and lower movement restricting portions 90, 92 are applied. In addition to the stable prevention of simultaneous contact over the entire circumference of the movable plate 76, such an effect can be advantageously ensured even by the difference in the wall thickness in the circumferential direction of the movable plate. It becomes. As a result, the generation of abnormal noise due to the contact of the movable plate 76 with the upper movement restricting portion 90 and the lower movement restricting portion 92 can be more effectively prevented.

  In the above embodiment, the entire surface of one surface of the movable plate 76 is the inclined surface 80. For example, as shown in FIGS. 13 and 14, only the outer peripheral portion of the one surface of the movable plate 76 is provided. Can be used as the inclined surface 96 that gradually approaches the flat surface 78 made of the other surface in the direction perpendicular to the thickness direction of the movable plate 76 from one side to the other side. In other words, a cylindrical protrusion 95 protruding in a cylindrical shape is formed at the center of one surface of the movable plate 76, and an outer peripheral portion surrounding the cylindrical protrusion 95 is inclined in a ring shape on the one surface. The surface 96 may be used. And it is also possible to comprise so that only the thickness of the outer peripheral part of the movable plate 76 can be continuously changed in the circumferential direction over the perimeter by doing so. Also by this, the same operation and effect as the first embodiment can be enjoyed effectively. Of course, only the outer peripheral portions of both surfaces of the movable plate 76 may be the ring-shaped inclined surface 96.

Further, for example, as shown in FIGS. 15 and 16, the outer peripheral portion of one surface of the movable plate 76 is gradually reduced in diameter in the thickness direction of the movable plate 76, and the bus bar (FIGS. 15 and 16). In FIG. 15, the angle between the straight line indicated by m ₁ and m ₂ and the central axis (P) (the angle indicated by θ ₁ or θ ₂ in FIG. 15) is the circumferential direction over the entire circumference. It is good also as the taper surface 98 which changes continuously in FIG. And it is also possible to comprise so that the thickness of the outer peripheral part of the movable plate 76 can be continuously changed in the circumferential direction over the perimeter by doing so.

  Also by this, the same operation and effect as the first embodiment can be enjoyed effectively. In addition, according to such a configuration, in particular, the thickness of the outer peripheral portion of the movable plate 76 is increased as the portion located on the inner peripheral side in the entire periphery. Therefore, when the movable plate 76 is moved by the input of the vibration load and the outer peripheral portion of the movable plate 76 is brought into contact with the upper movement restricting portion 90 or the lower movement restricting portion 92, the outer periphery of the movable plate 76 is increased. The part is swollen by the flow of fluid through the through-hole 74, and the contact state between the outer peripheral part of the movable plate 76 and the upper movement restriction part 90 or the lower movement restriction part 92 is partially eliminated. However, it can be prevented or suppressed as much as possible. That is, the fluid flow through the through hole 74 can be more effectively prevented under the contact state of the movable plate 76 with respect to the upper movement restricting portion 90 and the lower movement restricting portion 92.

  Therefore, according to this embodiment, when low-frequency large-amplitude vibration such as engine shake is input, fluid flow through the through hole 74 can be extremely effectively prevented. Accordingly, the vibration isolation effect based on the resonance action of the fluid flowing through the orifice passage 94 can be more effectively exhibited.

  Note that not only the outer peripheral portion of one surface of the movable plate 76 but also both surfaces of the movable plate 76 may have the outer peripheral portion as a tapered surface 98. Further, if the design is possible, the entire one surface of the movable plate 76 or the entire both surfaces can be made the tapered surface 98 as described above.

  Furthermore, in this embodiment, the notch 86 is not provided in the movable plate 76. Thus, the notch 86 can be omitted as appropriate. Even when the notch 86 is provided in the movable plate 76, the formation position, the number of formations, the width dimension, the length dimension, the shape (formation form), etc. are not limited in any way. Needless to say, it is determined appropriately in consideration of the noise prevention performance.

  Furthermore, when the inclined surfaces 80, 96 and the tapered surface 98 are formed on at least the outer peripheral portion of one or both surfaces of the movable plate 76, the inclined surfaces 80, 96 and the tapered surface 98 are convex or concave. It can also be configured with a rounded inclined surface or a tapered surface form.

  In addition, the movable plate 76 is not limited in shape, size, and number of arrangements to the illustrated ones. For example, depending on the shape, size, number of arrangements of the through holes 74 and the accommodating portions 72, Of course, it is determined appropriately.

  Further, as the material for forming the movable plate 76, an elastic material other than rubber or a material other than the elastic material can be used as appropriate.

  Further, the structure of the movement restricting portion is not limited to the illustrated one, and for example, the upper bottom wall portion or the lower bottom wall portion of the accommodating portion 72 or the circular recess 56 that provides the side surface of the accommodating portion 72. It is also possible to form a movement restricting portion by providing a protrusion or the like on the side surface or the like.

  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, Comprising: It is a figure equivalent to the II cross section in FIG. FIG. 2 is an explanatory top view of the fluid filled type vibration damping device shown in FIG. 1. FIG. 5 is a longitudinal cross-sectional explanatory view showing an example of a partition member main body constituting a partition member mounted on the fluid filled type vibration isolator shown in FIG. 1, corresponding to a section taken along line III-III in FIG. 4. FIG. 4 is an upper surface explanatory view of the partition member main body shown in FIG. 3. FIG. 7 is a longitudinal cross-sectional explanatory view showing an example of a lid that constitutes a partition member mounted on the fluid-filled vibration isolator shown in FIG. 1, corresponding to a VV cross section in FIG. 6. FIG. 6 is an upper surface explanatory view of the lid shown in FIG. 5. It is a longitudinal cross-sectional explanatory drawing which shows an example of the partition member with which the fluid enclosure type vibration isolator shown by FIG. 1 is mounted | worn, Comprising: It is a figure corresponded in the VII-VII cross section in FIG. FIG. 8 is an upper surface explanatory view of the partition member shown in FIG. 7. It is longitudinal cross-sectional explanatory drawing which shows an example of the movable plate accommodated and hold | maintained at the partition member shown by FIG. FIG. 10 is an upper surface explanatory view of the movable plate shown in FIG. 9. FIG. 10 is a partially enlarged cross-sectional explanatory view showing a state in which the movable plate shown in FIG. 9 is accommodated and held in the partition member shown in FIG. 7. It is a figure corresponding to FIG. 9 which shows another example of the movable plate with which the fluid filled type vibration isolator shown in FIG. 1 is mounted. It is front explanatory drawing which shows another example of the movable plate with which the fluid filled type vibration isolator shown by FIG. 1 is mounted | worn. It is an upper surface explanatory drawing in FIG. It is front explanatory drawing which shows the other example of the movable plate with which the fluid enclosure type vibration isolator shown by FIG. 1 is mounted | worn. It is upper surface explanatory drawing in FIG.

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 Lid body 58,68 Through-hole 72 Accommodating part 74 Through-hole 76 Movable plate 78 Flat surface 80 Inclined surface 86 Notch 88 Tongue piece 90 Upper movement restricting portion 92 Lower movement restricting portion 94 Orifice passage 96 Ring-shaped inclined surface 98 Tapered surface

Claims (7)

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 the second fluid chamber is provided with a through-hole capable of communicating with each other, and a movable plate capable of blocking the through-hole so as to cover the entire through-hole is provided with the first fluid chamber and the second fluid chamber. A fluid which is arranged so as to be movable between the fluid chamber, and is provided with a movement restricting portion which contacts the outer peripheral portion of the movable plate and restricts the movement of the movable plate on both sides of the outer peripheral portion of the movable plate. In the enclosed vibration isolator,
The fluid filled type vibration damping device, wherein the thickness of at least the outer peripheral portion of the movable plate is continuously changed in the circumferential direction over the entire circumference.   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.   At least the outer peripheral portion of at least one surface of the movable plate gradually approaches the other surface of the movable plate as it goes from one side to the other side in one direction perpendicular to the plate thickness direction of the movable plate. The thickness of at least the outer peripheral portion of the movable plate can be continuously changed in the circumferential direction over the entire circumference by forming the inclined surface so as to be inclined. Item 3. A fluid-filled vibration isolator according to Item 2.   At least the outer peripheral portion of at least one surface of the movable plate is gradually reduced in diameter toward one side in the plate thickness direction of the movable plate, and the angle between the bus bar and the central axis of the movable plate is all Since the tapered surface continuously changes in the circumferential direction over the circumference, the thickness of at least the outer peripheral portion of the movable plate can be continuously changed in the circumferential direction over the entire circumference. The fluid-filled vibration isolator according to claim 1 or 2.   2. A plurality of cuts extending from an outer peripheral edge toward a central portion and dividing the outer peripheral portion in a circumferential direction are provided at least at an outer peripheral portion of the movable plate at a predetermined distance in the circumferential direction. The fluid-filled vibration isolator according to claim 4.   The fluid filled type vibration damping device according to claim 5, wherein distances between the notches adjacent to each other in a circumferential direction of the movable plate are different in size. The fluid-filled vibration isolator according to any one of claims 1 to 6, wherein the movable plate is made of an elastically deformable material.

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