JP2007211971A - Liquid-filled vibration isolator - Google Patents

Abstract

A liquid-filled vibration isolator capable of suppressing the generation of abnormal noise without deteriorating the vibration isolation characteristics is provided.
In a liquid-filled vibration isolator including a first fixture, a second fixture, a vibration isolating base, a diaphragm, a partition body, and an orifice, the partition body is An annular orifice forming member 16 provided on the inner side of the second fixture 2, a rubber wall 15 vulcanized and bonded to the inner peripheral surface 16N to close the space between the inner peripheral surfaces, and the rubber wall in the axial direction G And a pair of partition plates 17 and 18 sandwiched by one, one partition plate 18 forms a part of the chamber wall of the first liquid chamber 11A, and the other partition plate 17 is a chamber wall of the second liquid chamber 11B. The displacement amount of the pair of partition plates 17 and 18 in the axial direction G of the orifice forming member 16 is regulated by the rubber wall 15.
[Selection] Figure 1

Description

  The present invention relates to a liquid-filled vibration isolator.

  Conventionally, as described in, for example, Patent Documents 1 and 2 below, a first mounting tool, a cylindrical second mounting tool, and a rubber-like elastic material that connects the first mounting tool and the second mounting tool. An anti-vibration base comprising: a diaphragm made of a rubber film which is attached to the second fixture and forms a liquid enclosure between the anti-vibration base; and the liquid enclosure is a first liquid on the anti-vibration base side. A partition that divides the chamber into a second liquid chamber on the diaphragm side, and an orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other, and the first outer peripheral edge of the diaphragm is at least inside the annular mounting plate There is known a liquid-filled vibration isolator in which a second outer peripheral edge portion of the mounting plate is fixed to an inner peripheral portion of the second fixture by vulcanizing and bonding to a peripheral edge portion. In these documents, it is also disclosed that the partition is configured by an annular orifice forming member that forms the orifice and a rubber wall that closes an inner peripheral portion of the orifice forming member.

  In the following Patent Document 3, the partition body includes an elastic partition membrane, an annular orifice forming member that accommodates the elastic partition membrane, and a first lattice portion that regulates the displacement amount of the elastic partition membrane from both sides of the membrane surface. And a second grating portion. The orifice forming member that accommodates the elastic partition membrane is clamped and fixed between a receiving step formed on the vibration-proof base and a metal ring disc-shaped clamping member (called a partition plate lower bracket). The outer peripheral edge of the clamping member is caulked and fixed to the inner peripheral part of the second fixture. In this clamping and fixing state, the clamping member is superposed on the metal mounting plate on the outer peripheral edge side of the diaphragm from above, and the mounting plate is superposed on the flange on the upper end side of the cup-shaped bottom fitting of the second fixture from above. is doing.

  In the liquid-filled vibration isolator described in Patent Document 3, when a large-amplitude low-frequency vibration occurs, the liquid flows through the orifice between the first liquid chamber and the second liquid chamber, and vibrates due to the liquid flow effect. Is attenuated. When a high-frequency vibration with a small amplitude occurs, the elastic partition film is reciprocally deformed to absorb the liquid pressure in the first liquid chamber and attenuate the vibration. According to the above-described conventional structure, the impact when the elastic partition film collides with the first lattice portion and the second lattice portion is transmitted to the bottom metal fitting via the holding member made of a metal material and the mounting plate, and the bottom It was transmitted from the metal fittings to the vehicle body side, and abnormal noise was generated in the passenger compartment.

  In order to solve this problem, a means for reducing the clearance of the elastic partition film with respect to the first lattice part and the second lattice part can be considered, but according to this means, the dynamic spring constant in the high frequency range is increased, Desired vibration isolation characteristics cannot be obtained.

  As described above, in this type of liquid-filled vibration isolator, the reciprocating deformation member provided on the partition body is easily displaced with respect to the high-frequency vibration with a small amplitude, and the vibration input with a large amplitude is prevented. Therefore, it is necessary to restrict the displacement of the reciprocating member as much as possible to exert the liquid flow effect by the orifice. In addition, it is required that the impact when the reciprocating member collides against the member that regulates the amount of displacement is not transmitted to the vehicle interior. However, heretofore, no one that sufficiently satisfies these requirements has been obtained.

  In Patent Document 4 below, a rubber wall is provided in the central opening of the partition body, and a pair of displacement restricting members that restrict elastic deformation are provided on both sides of the film surface of the rubber wall. And the structure which connected the said pair of displacement control member via the connection part which penetrates the center part of the rubber wall is disclosed. However, in this document, a diaphragm is superposed on the lower surface of the partition body, and the rubber wall is attached to the opening at the center of both, so the lower displacement regulating member of the pair of displacement regulating members is It is arranged facing the air chamber, not the liquid chamber. Therefore, in this structure, the vibration of the rubber wall due to the fluid pressure fluctuation of the upper first liquid chamber cannot be sufficiently exerted on the lower second liquid chamber, that is, the vibration of the first liquid chamber is applied to the air chamber. There is a problem that the effect of reducing the spring constant at the time of high frequency vibration is inferior because it is only escaped.

  Moreover, in the structure of patent document 4, the displacement of the rubber wall at the time of large amplitude vibration input is regulated by the pair of displacement regulating members, and the displacement regulating member extends beyond the opening edge of the partition body main body. It is extended. Therefore, when a large amplitude vibration is input, the displacement regulating member abuts on the partition body main body in the axial direction via the edge of the rubber wall, and the rubber is compressed between the displacement regulating member and the partition body main body. The spring constant rises up rapidly. Further, at this time, since the input from the displacement regulating member to the partition body is large, it also causes noise.

  On the other hand, Patent Document 5 below discloses a “release device assembly” including a pair of upper and lower plate-like portions and a connecting body that connects the two at the center of the partition. However, the partition provided with the release device assembly is not provided with a rubber wall. That is, the release device assembly is slidably provided in the central opening of the partition made of a rigid body, and a pair of partition plates sandwiching the rubber wall in the axial direction in the center of the rubber wall No configuration is disclosed.

Further, in Patent Document 6 below, as an engine mount for an automobile, two rubber bellows constituting an air spring are formed, an intermediate ring having an additional weight is held between the mountains, and the inside of the rubber bellows Is divided into two chambers by a pair of fixing plates that sandwich the inward flange of the intermediate ring. However, the rubber part sandwiched between the pair of fixing plates does not correspond to a rubber wall closing the space between the inner peripheral surfaces of the ring-shaped member. Therefore, high frequency vibration is reduced by reciprocating deformation of the rubber part. Is not possible. Therefore, this document also does not disclose any configuration in which a pair of partition plates that sandwich the rubber wall in the axial direction are provided at the center of the rubber wall.
Japanese Unexamined Patent Publication No. 2002-310224 Japanese Unexamined Patent Publication No. 2001-027278 Japanese Unexamined Patent Publication No. 2004-316895 UK Patent Application Publication No. 2332498 Japan National Kaihei 03-062244 Japanese Unexamined Patent Publication No. 57-26015

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid-filled vibration isolator capable of suppressing the generation of abnormal noise without deteriorating the vibration isolation characteristics.

A liquid-filled vibration isolator according to the present invention includes a first mounting tool, a cylindrical second mounting tool, and a vibration-proof base made of a rubber-like elastic material that connects the first mounting tool and the second mounting tool. A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the vibration isolating substrate and the first liquid chamber on the vibration isolating substrate side and the diaphragm side. A partition body for partitioning into the second liquid chamber, and an orifice for communicating the first liquid chamber and the second liquid chamber,
The partition is
An annular orifice forming member that is provided inside the peripheral wall of the second fixture and forms the orifice;
A rubber wall that vulcanizes and adheres to the inner peripheral surface of the orifice-forming member to block between the inner peripheral surfaces;
It is connected to each other via a connecting body that penetrates the radial center of the rubber wall, and comprises a pair of partition plates that sandwich the rubber wall in the axial direction of the rubber wall,
In the pair of partition plates, one partition plate constitutes a part of the chamber wall of the first liquid chamber, and the other partition plate constitutes a part of the chamber wall of the second liquid chamber. A displacement amount of the pair of partition plates in the axial direction of the forming member is configured to be regulated by the rubber wall.

  According to the above configuration, the displacement amount of the pair of partition plates is regulated by the rubber wall provided between the inner peripheral surfaces of the orifice forming member. The desired anti-vibration characteristics for absorbing high-frequency vibrations can be obtained. That is, when large amplitude vibration occurs, the liquid flows through the orifice between the first liquid chamber and the second liquid chamber, and the vibration can be attenuated by the liquid flow effect. Then, when high-frequency vibration with a small amplitude occurs, the pair of partition plates reciprocate together to absorb the liquid pressure in the first liquid chamber and attenuate the vibration. At that time, since the pair of partition plates face the first liquid chamber and the second liquid chamber, respectively, the liquid pressure fluctuation in the first liquid chamber can be sufficiently exerted on the second liquid chamber. Since the resonance effect in both the first liquid chamber and the second liquid chamber is obtained, the vibration reduction effect is excellent.

  Further, according to the above configuration, since the rubber wall is interposed between the pair of partition plates and the hard other member such as the orifice forming member, when absorbing a vibration of a large amplitude or a high frequency. Even if the pair of partition plates collide with the rubber wall, the impact is absorbed by the rubber wall. As a result, the impact is not easily transmitted to the second fixture or the first fixture.

  In the present invention, a mounting hole through which the connecting body penetrates is provided in the central portion of the rubber wall, and annular convex portions protruding outward in the axial direction are provided on both front and back sides around the mounting hole, When the annular projections are fitted in annular recesses provided in the pair of partition plates, the rubber wall and the partition plate can be positioned in the radial direction, and vibration input with a large amplitude can be performed. Sometimes, even if the mounting hole of the rubber wall is to be widened, it is restricted by the engagement between the convex portion and the concave portion of the partition plate, thereby preventing the partition plate from coming off (dropping off) from the rubber wall.

  In the present invention, when the outer peripheral edge of each partition plate terminates on the radially inner side from the outer peripheral edge of the rubber wall and the inner peripheral surface of the orifice forming member, a spring constant is generated when a large amplitude vibration is input. Can be started up gently and abnormal noise can be suppressed. Further, since the force received by the partition plate is transmitted to the orifice forming member as a force substantially only in the shearing direction through the rubber wall, the input to the orifice forming member is small.

  In the present invention, each partition plate is a first partition plate portion for connection on the radial center side, and a second partition plate that is positioned on the radially outer side of the first partition plate portion and sandwiches the rubber wall. And a third partition plate portion that is located on the radially outer side of the second partition plate portion and faces the rubber wall with a gap therebetween, and tunes vibration isolation characteristics by the gap. be able to.

  In the present invention, the plate surface facing the rubber wall side of the third partition plate portion and the wall surface of the rubber wall facing the plate surface are more outward in the axial direction of the rubber wall toward the radially outer side. If the gap is formed so as to be wider toward the radially outer side of the orifice forming member, the displacement of the partition plate is softly restricted by the wall surface of the rubber wall. It is possible to make it difficult to generate an impact.

  In the present invention, the coupling body includes a convex portion protruding from the first partition plate portion of one of the partition plates, and a mounting hole for press-fitting the convex portion is formed through the central portion of the rubber wall, A pair of partition plates can be reliably connected to each other when the leading end of the convex portion is fitted and fixed to a fitting portion formed on the first partition plate portion of the other partition plate.

  In the present invention, when the one partition plate facing the first liquid chamber has an outer shape larger than that of the other partition plate facing the second liquid chamber, the following effects are achieved. The That is, in general, the force applied to the partition plate is larger during the pressurization displacement than during the negative pressure displacement of the first liquid chamber. Therefore, by configuring as described above, the force is applied according to the force applied to the partition plate. The regulation effect can be enhanced, and therefore the liquid flow effect of the orifice at the time of large amplitude vibration input can be enhanced more effectively.

  In the present invention, the first outer peripheral edge of the diaphragm is vulcanized and bonded to at least the inner peripheral edge of the annular mounting plate, and the second outer peripheral edge of the mounting plate is fixed to the inner peripheral portion of the second mounting tool. A cylindrical rising wall that rises inward in the axial direction of the orifice forming member is connected to the inner peripheral edge of the mounting plate, and the first outer peripheral edge of the diaphragm includes the rising wall. The cover plate is vulcanized and bonded to the inner peripheral edge of the mounting plate, the rising wall is fitted into one end of the orifice forming member, the mounting plate portion on the base side of the rising wall, and the vibration-proof base The orifice forming member is sandwiched and fixed by the formed receiving step portion, between the mounting plate portion and one end portion of the orifice forming member, and the outer peripheral surface of the rising wall of the mounting plate and the orifice Between the inner peripheral surface of the one end portion of the forming member, a rubber portion of the first outer peripheral edge portion of the diaphragm when interposed, which achieves the following advantages.

  That is, since the cylindrical rising wall is fitted into one end of the orifice forming member, the orifice forming member can be positioned in the radial direction. Further, a first outer periphery of the diaphragm is disposed between the mounting plate portion and one end portion of the orifice forming member, and between the outer peripheral surface of the rising wall of the mounting plate and the inner peripheral surface of the one end portion of the orifice forming member. Since the peripheral rubber portion is interposed, even if the shock is transmitted to the orifice forming member, the shock can be absorbed by the rubber portion, and the shock is applied to the vehicle body via the mounting plate and the second mounting tool. It is possible to prevent transmission to the side. Furthermore, it is possible to omit a metal ring disk-shaped clamping member for clamping and fixing the orifice forming member together with the receiving step portion formed on the vibration isolating base, and the number of parts can be reduced and the structure can be simplified. Can be reduced in weight.

  According to the present invention, it is possible to provide a liquid-filled vibration isolator capable of suppressing the generation of abnormal noise without deteriorating the vibration isolation characteristics.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a liquid-filled vibration isolator 100 according to this embodiment. The vibration isolator 100 includes a first mounting bracket 1 that is mounted on an automobile engine, a cylindrical second mounting bracket 2 that is mounted on a vehicle body frame below the engine, and a rubber-like elastic material that connects them. A vibration base 3, a stopper fitting 40, and a rubber cover 41 that covers the stopper fitting 40 are provided.

  The first mounting bracket 1 includes an upward first mounting bolt 6A. The second mounting bracket 2 is composed of a cylindrical bracket 4 on which the vibration-proof base 3 is vulcanized and a cup-shaped bottom bracket 5, and a downward second mounting bolt 6 </ b> B is protruded from the center of the bottom bracket 5. ing. The anti-vibration base 3 is formed in a truncated cone shape, and the upper end surface thereof is vulcanized and bonded to the first mounting bracket 1 and the lower end portion thereof is vulcanized and bonded to the upper end opening portion of the tubular bracket 4 that extends upward. A rubber film-like seal wall portion 7 covering the inner peripheral surface of the cylindrical metal fitting 4 is connected to the lower end portion of the vibration-proof base 3.

  A partial spherical diaphragm 9 made of a rubber film that forms a liquid sealing chamber 8 is attached to the second mounting bracket 2 between the lower surface of the vibration isolating base 3 and a liquid is sealed in the liquid sealing chamber 8. The diaphragm 9 is covered with the bottom metal fitting 5. A partition body 12 is provided to divide the liquid enclosure chamber 8 into a first liquid chamber 11A on the vibration isolating base 3 side and a second liquid chamber 11B on the diaphragm 9 side, and an orifice for communicating the first liquid chamber 11A and the second liquid chamber 11B. 25 is provided.

  The partition body 12 includes an annular orifice forming member 16 provided inside a cylindrical peripheral wall portion 28 of the second mounting bracket 2 and an outer peripheral portion 15G vulcanized and bonded to an inner peripheral surface 16N of the orifice forming member 16. The rubber wall 15 is sealed between the inner peripheral surface 16N and a connecting body (first convex portion 48 described later) penetrating the radial center portion 15T of the rubber wall 15 to connect the rubber wall 15 to the rubber. It consists of a pair of upper and lower partition plates 17 and 18 sandwiched in the axial direction G of the wall 15.

  The orifice forming member 16 is a member that forms the orifice 25 between the peripheral wall portion 28 of the second mounting bracket 2 and, more specifically, between the seal wall portion 7 that covers the inner peripheral surface of the peripheral wall portion 28. And is fitted on the inner periphery of the peripheral wall 28. Thus, the orifice 25 is formed along the circumferential direction P of the orifice forming member 16 (see FIGS. 6 and 7). A plurality of ribs 90 are provided on the orifice forming member 16.

  The rubber wall 15 has a disk shape, and its outer peripheral portion 15G is vulcanized and bonded to the inner peripheral surface 16N of the cylindrical main body 16H of the orifice forming member 16 (see FIG. 3).

  In the pair of partition plates 17 and 18, one partition plate 18 constitutes a part of the chamber wall of the first liquid chamber 11A (that is, it faces the first liquid chamber 11A), and the other The partition plate 17 constitutes a part of the chamber wall of the second liquid chamber 11B (that is, the partition plate 17 faces the second liquid chamber 11B). The displacement amount of the pair of partition plates 17 and 18 in the axial direction G of the orifice forming member 16 (the same direction as the axial direction G of the rubber wall 15) is regulated by the rubber wall 15. Yes.

  The outer peripheral edges 17G and 18G of the partition plates 17 and 18 terminate on the radially inner side of the outer peripheral edge of the rubber wall 15 and the inner peripheral surface 16N of the orifice forming member 16 (see FIG. 3). That is, as shown in FIG. 2, in this example, the outer peripheral edge of the rubber wall 15 and the inner peripheral surface 16N of the orifice forming member 16 are coincident with each other in the position in the radial direction K of the orifice forming member 16. Therefore, the outer diameters D1 and D2 of the partition plates 17 and 18 are set to be smaller than the diameter D0 of the joint surface (that is, the inner peripheral surface 16N), and the partition plates 17 and 18 are more than the rubber wall 15 in plan view. Has a small outer shape (see FIG. 6). Further, in this example, the partition plate 18 facing the first liquid chamber 11A has a larger outer shape than the partition plate 17 facing the second liquid chamber 11B (the outer diameter D1 of the partition plate 18> the partition plate). 17 outer diameter D2).

  As shown in FIG. 8, each partition plate 17, 18 is positioned on the radially central side of the first partition plate portion 51 for connection on the radial center side and on the radially outer side of the first partition plate portion 51. A second partition plate 52 sandwiching the first partition plate 15 and a third partition located on the radially outer side of the second partition plate portion 52 and facing the rubber wall 15 with a gap S (see FIG. 3). It consists of a plate part 53. The plate surface 53C facing the rubber wall 15 side of the third partition plate portion 53 and the wall surface 15C of the rubber wall 15 opposed to the plate surface 53C are respectively in the axial direction of the rubber wall 15 toward the radially outer side. It is formed in the taper surface located in the outer side, and it is comprised so that the said clearance gap S may become large gradually toward the radial direction outer side of the orifice formation member 16. FIG. Thereby, the rubber wall 15 is formed so that the thickness gradually increases toward the radially outer side. In the longitudinal section of the partition 12, the tapered surface is set in a curved shape that bends gently. The axis O of the rubber wall 15 and the axis O of the partition plates 17 and 18 coincide.

  The connecting body includes a cylindrical first convex portion 48 projecting from the first partition plate portion 51 of one partition plate 18. An attachment hole 60 for press-fitting the first convex portion 48 is formed through the central portion 15T of the rubber wall 15. And the front-end | tip part 48A formed in the cyclic | annular form of the 1st convex part 48 fits to the fitting part 61 formed in the 1st partition plate part 51 of the other partition plate 17, and is adhering. The fitting portion 61 includes an annular first groove 61A and a second convex portion 61B protruding from the radially inner side of the first groove 61A. And the 1st convex part 48 press-fits into the said mounting hole 60, and the cyclic | annular 3rd convex part 70 which protrudes in the axial direction one side formed in the inner peripheral part side of the rubber wall 15 is in the 1st groove | channel 61A. While fitting, the second convex portion 61B is fitted in the hollow portion 71 of the tip portion 48A of the first convex portion 48. An annular second groove 73 surrounding the first convex portion 48 is formed on the base end portion side of the first convex portion 48, and the axial direction formed in the second groove 73 on the inner peripheral edge side of the rubber wall 15. An annular fourth convex portion 74 protruding to the other side is fitted.

  As a result, annular convex portions 70 and 74 projecting outward in the axial direction are provided on both front and back sides around the mounting hole 60 of the rubber wall 15, and the annular convex portions 70 and 74 are a pair of partition plates. The rubber wall 15 and the pair of partition plates 17 and 18 are assembled in a state of being fitted into grooves 61A and 73 that are annular recesses provided in the respective portions 17 and 18. The pair of partition plates 17 and 18 are each formed of a resin material, and the first convex portion 48 and the fitting portion 61 are fixed to each other by ultrasonic welding.

  As shown in FIGS. 6 and 7, a vertical wall 42 for forming the end 45 in the circumferential direction P of the orifice 25 is provided in the orifice forming member 16, and the orifice 25 and the first liquid chamber are provided in the orifice forming member 16. A first opening 31 for communicating 11A and a second opening 35 for communicating orifice 25 and second liquid chamber 11B are formed.

  As shown in FIGS. 1 and 4, the first outer peripheral edge 14 of the diaphragm 9 is vulcanized and bonded to the inner peripheral edge 13N of the annular mounting plate 13, and the second outer peripheral edge 13G of the mounting plate 13 is the first. 2 It is fixed to the inner periphery 2N of the mounting bracket 2. Specifically, these three members are caulked and fixed together so that the second outer peripheral edge portion 13G of the mounting plate 13 and the upper end portion of the bottom metal fitting 5 are wrapped by the lower end portion of the cylindrical metal fitting 4.

  As shown in FIG. 5, a cylindrical rising wall 29 rising on the axially inner side G <b> 1 of the orifice forming member 16 is connected to the inner peripheral edge 13 </ b> N of the mounting plate 13, and the first outer peripheral edge of the diaphragm 9. The portion 14 is vulcanized and bonded to the inner peripheral edge portion 13N of the mounting plate 13 so as to cover the rising wall 29. The rising wall 29 is fitted into the one end portion 16A of the orifice forming member 16, the attachment plate portion 32 on the base side of the rising wall 29, and the receiving step portion 33 formed on the vibration isolating base 3 (see FIG. 1). The orifice forming member 16 is clamped and fixed between the mounting plate portion 32 and one end portion 16A of the orifice forming member 16, and between the outer peripheral surface 29G of the rising wall 29 and one end portion 16A of the orifice forming member 16. A rubber portion 34 of the first outer peripheral edge portion 14 of the diaphragm 9 is interposed between the inner peripheral surface 16N.

  The first outer peripheral edge portion 14 of the diaphragm 9 is vulcanized and bonded to the inner peripheral edge portion 13N of the mounting plate 13 so as to cover the convex surface 36N of the corner portion 36 formed by the rising wall 29 and the mounting plate portion 32. is doing. The convex side surface 36N of the corner portion 36 is formed in an arc shape in the longitudinal section, and the first outer peripheral edge portion 14 side of the diaphragm 9 can swing up and down around the corner portion 36 in the arc shape in the longitudinal section as vibration is input. It is configured.

  In the liquid-filled vibration isolator 100 according to the present embodiment configured as described above, the displacement amount of the pair of partition plates 17 and 18 is restricted by the rubber wall 15 when a large-amplitude low-frequency vibration occurs. 25, the liquid can be circulated between the first liquid chamber 11A and the second liquid chamber 11B, and the vibration can be attenuated by the liquid flow effect. At that time, since the outer shape of each partition plate 17 and 18 is smaller than that of the rubber wall 15 and an area without a rigid body is secured only by the rubber wall 15 between the inner peripheral surface 16N of the orifice forming member 16, The force received by the partition plates 17 and 18 by the input of the amplitude vibration is transmitted to the orifice forming member 16 through the rubber wall 15 as a force substantially only in the shearing direction, so that the input to the orifice forming member 16 is small. Also, the spring constant can be raised gently. Moreover, since the thickness of the rubber wall 15 on the radially outer side than the partition plates 17 and 18 is set to be large, the displacement restriction effect of the partition plates 17 and 18 is excellent.

  On the other hand, when a high-frequency vibration with a small amplitude occurs, the pair of partition plates 17 and 18 can reciprocate together as the partition plates 17 and 18 are integrated without being restricted by the rubber wall 15. The vibration can be attenuated by absorbing the hydraulic pressure in the first liquid chamber 11A. At that time, since the pair of partition plates 17 and 18 face the first liquid chamber 11A and the second liquid chamber 11B, respectively, the fluctuation of the liquid pressure in the first liquid chamber 11A is sufficiently large with respect to the second liquid chamber 11B. Since the resonance effect in both the first liquid chamber 11A and the second liquid chamber 11B can be obtained, the vibration reduction effect is excellent.

  Further, according to the present embodiment, since the rubber wall 15 is interposed between the pair of partition plates 17 and 18 and the orifice forming member 16, the pair of the pair of partition plates 17 and 18 absorbs vibration at high amplitude or high frequency. Even if the partition plates 17 and 18 collide with the rubber wall 15, the impact is absorbed by the rubber wall 15. As a result, it is difficult for the impact to be transmitted to the second mounting bracket 2 and the first mounting bracket 1. Moreover, the orifice forming member 16 itself is also fixed to the second mounting bracket 2 via the seal wall portion 7, the receiving step portion 33 and the rubber portion 34 of the diaphragm 9, which are elastic bodies. Even if it is transmitted to the orifice forming member 16, the impact can be absorbed by these elastic body portions, and the impact can be prevented from being transmitted to the vehicle body side.

  As described above, according to the present embodiment, the partition plates 17 and 18 are easily displaced with respect to the high-frequency vibration with a small amplitude, and the displacement of the partition plates 17 and 18 with respect to a large-amplitude vibration input. The liquid flow effect by the orifice 25 can be exerted as much as possible, and the impact when the partition plates 17 and 18 collide with the rubber wall 15 can be prevented from being transmitted into the vehicle interior.

  Further, in the present embodiment, annular convex portions 70 and 74 are provided on the front and back around the mounting hole 60 of the rubber wall 15, and these are fitted in the grooves 61 </ b> A and 73 of the partition plates 17 and 18. Since the rubber wall 15 and the pair of partition plates 17 and 18 are fixed to each other, the mounting hole 60 of the rubber wall 15 will be widened by an excessive input applied to the partition plates 17 and 18 particularly when a large amplitude vibration is input. However, it is possible to prevent the partition plates 17 and 18 from coming off from the rubber wall 15 by the fitting.

  In the present embodiment, since the partition plate 18 on the first liquid chamber 11A side is formed larger than the partition plate 17 on the second liquid chamber 11B side, the pair of partition plates 17 and 18 are located upward ( That is, the downward displacement (that is, the second liquid chamber 11B side) is more limited than the displacement toward the first liquid chamber 11A side. In general, when a large amplitude vibration is input, the force applied to the pair of partition plates 17 and 18 is greater than the negative pressure displacement of the first liquid chamber 11A when the pair of partition plates 17 and 18 are about to be displaced upward. It is larger at the time of pressure displacement that tries to be displaced downward. Therefore, by setting the sizes of the partition plates 17 and 18 as described above, the displacement restriction effect can be enhanced according to the force applied to the partition plates 17 and 18, and therefore, when a large amplitude vibration is input. The liquid flow effect of the orifice 25 can be enhanced more effectively.

  Further, for example, in a structure in which a dedicated clamping member for clamping and fixing the orifice forming member is provided together with the receiving step portion on the vibration isolating base side, and an opening to the second liquid chamber side is provided in the clamping member, In order to determine the length of the orifice, a laborious operation of positioning the orifice forming member with respect to the holding member in the circumferential direction is required. On the other hand, as in this embodiment, the vertical wall 42 for forming the end 45 in the circumferential direction P of the orifice 25 and the second opening 35 for communicating the orifice 25 and the second liquid chamber 11B are formed as an orifice. If the member 16 is provided, the length of the orifice 25 in the circumferential direction P is determined only by the orifice forming member 16, so that the above work becomes unnecessary and workability can be improved.

  Further, since the first outer peripheral edge portion 14 of the diaphragm 9 is vulcanized and bonded so as to cover the convex side surface 36N of the corner portion 36 of the arcuate cross section of the mounting plate 13, the first outer peripheral edge portion 14 of the diaphragm 9 is bonded. The side of the diaphragm 9 can be swung around the corner portion 36 having a circular arc shape in accordance with the input of vibration, and a problem that force is concentrated on a part of the first outer peripheral edge portion 14 of the diaphragm 9 can be avoided. The durability of 9 can be improved.

Longitudinal sectional view of a liquid filled type vibration isolator according to an embodiment Vertical sectional view of partition and diaphragm of vibration isolator as above Longitudinal sectional view of the partition Longitudinal sectional view of the diaphragm Longitudinal sectional view of the connecting structure of the same partition and diaphragm Top view of the partition F view of FIG. Exploded longitudinal sectional view of the partition

Explanation of symbols

1 ... 1st mounting tool (1st mounting bracket)
2 ... 2nd fixture (2nd fixture), 2N ... Inner circumference 3 ... Anti-vibration base 8 ... Liquid enclosure 9 ... Diaphragm 11A ... 1st liquid chamber 11B ... 2nd liquid chamber 12 ... Partition body 13 ... Installation Plate, 13N ... Inner peripheral edge, 13G ... Second outer peripheral edge 14 ... First outer peripheral edge 15 ... Rubber wall, 15C ... Wall surface, 15G ... Outer peripheral part, 15T ... Radial central part 16 ... Orifice forming member, 16A ... One end, 16N ... inner peripheral surface 17 ... partition plate (the other partition plate)
18 ... Partition plate (one partition plate)
25 ... Orifice 28 ... Peripheral wall part 29 ... Rising wall, 29G ... Outer peripheral surface 32 ... Mounting plate part 33 ... Receiving step part 34 ... Rubber part 48 ... Connected body (convex part (first convex part)), 48A ... Tip part DESCRIPTION OF SYMBOLS 51 ... 1st partition plate part 52 ... 2nd partition plate part 53 ... 3rd partition plate part, 53C ... Plate surface 60 ... Mounting hole 61 ... Fitting part, 61A ... 1st groove | channel (annular recessed part), 61B ... 1st 2 convex part 70 ... 3rd convex part (annular convex part)
73 ... second groove (annular recess)
74: Fourth convex portion (annular convex portion)
100: Liquid filled vibration isolator G: Axial direction of orifice forming member (axial direction of rubber wall)
G1 ... Axial direction inner side of orifice forming member K ... Diameter direction of orifice forming member S ... Gap

Claims (8)

A first fixture;
A cylindrical second fixture;
An anti-vibration base made of a rubber-like elastic material connecting the first fixture and the second fixture;
A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the anti-vibration base;
A partition that divides the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side;
A liquid-filled vibration isolator comprising an orifice for communicating the first liquid chamber and the second liquid chamber,
The partition is
An annular orifice forming member that is provided inside the peripheral wall of the second fixture and forms the orifice;
A rubber wall that vulcanizes and adheres to the inner peripheral surface of the orifice-forming member to block between the inner peripheral surfaces;
It is connected to each other via a connecting body that penetrates the radial center of the rubber wall, and comprises a pair of partition plates that sandwich the rubber wall in the axial direction of the rubber wall,
In the pair of partition plates, one partition plate constitutes a part of the chamber wall of the first liquid chamber, and the other partition plate constitutes a part of the chamber wall of the second liquid chamber. A liquid-filled vibration isolator configured such that a displacement amount of the pair of partition plates in the axial direction of the forming member is regulated by the rubber wall.   An attachment hole through which the connecting body passes is provided at the center of the rubber wall, and annular protrusions that protrude outward in the axial direction are provided on both front and back sides around the attachment hole. The liquid-filled type vibration damping device according to claim 1, wherein the portion is fitted in an annular recess provided in each of the pair of partition plates.   The liquid filled type vibration damping device according to claim 1, wherein an outer peripheral edge of each partition plate terminates radially inward from the outer peripheral edge of the rubber wall and the inner peripheral surface of the orifice forming member.   Each partition plate includes a first partition plate portion for connection on a radially central side, a second partition plate portion that is positioned on the radially outer side of the first partition plate portion and sandwiches the rubber wall, and The liquid-filled type vibration damping device according to claim 1, further comprising a third partition plate portion that is located radially outward of the second partition plate portion and faces the rubber wall with a gap.   A plate surface facing the rubber wall side of the third partition plate portion and a wall surface of the rubber wall facing the plate surface are positioned on the outer side in the axial direction of the rubber wall toward the radially outer side, respectively. The liquid-filled type vibration damping device according to claim 4, wherein the liquid-filled type vibration damping device is formed on a tapered surface so that the gap is wider toward a radially outer side of the orifice forming member.   The connecting body includes a convex portion protruding from the first partition plate portion of one of the partition plates, and a mounting hole for press-fitting the convex portion is formed through the central portion of the rubber wall. The liquid-filled vibration isolator according to claim 4, wherein the front end portion is fitted and fixed to a fitting portion formed in the first partition plate portion of the other partition plate.   The liquid filled type vibration damping device according to claim 1, wherein the one partition plate facing the first liquid chamber has an outer shape larger than the other partition plate facing the second liquid chamber. The first outer peripheral edge of the diaphragm is vulcanized and bonded to at least the inner peripheral edge of the annular mounting plate, and the second outer peripheral edge of the mounting plate is fixed to the inner peripheral portion of the second mounting tool,
A cylindrical rising wall that rises inward in the axial direction of the orifice forming member is connected to the inner peripheral edge of the mounting plate,
The first outer peripheral edge of the diaphragm is vulcanized and bonded to the inner peripheral edge of the mounting plate in a state of covering the rising wall,
The rising wall is fitted into one end portion of the orifice forming member, and the orifice forming member is clamped and fixed by a mounting plate portion on the base side of the rising wall and a receiving step portion formed on the vibration-proof base. Between the mounting plate portion and one end portion of the orifice forming member, and between the outer peripheral surface of the rising wall of the mounting plate and the inner peripheral surface of the one end portion of the orifice forming member. The liquid-filled vibration isolator according to claim 1, wherein a rubber portion of the first outer peripheral edge portion is interposed.