JP2005083461A - Vibration absorption device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently absorbing high frequency vibration while simply constructing a partition plate for partitioning a liquid chamber in a liquid filled vibration absorption device. <P>SOLUTION: The liquid chamber F in the vibration absorption device 10 is partitioned into a pressure chamber F1 and a balancing chamber F2 with the partition plate 30. An orifice path 40 (a communication path) is formed to encircle an outer peripheral portion of the partition plate 30 for making the pressure chamber F1 in fluid communication with the balancing chamber F2. The outer peripheral portion 30a of the partition plate 30 is held between a bulged portion 13c of an elastic supporting member 13 (an elastic member) constituting part of a peripheral wall portion of the orifice path 40 and an inner cylinder portion 22c of a diaphragm 20 (an elastic membrane member), and an outer peripheral end portion 30b of the partition plate 30 is protruded into the orifice path 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to a liquid-filled vibration isolator for supporting a vibration generator such as an automobile engine, and particularly relates to measures for improving vibration damping characteristics.

  Conventionally, as this type of liquid-filled vibration isolator, as disclosed in Patent Document 1, for example, an upper first mounting member connected to a vibration receiving side of a vehicle body frame and the like and a vibration source side of an engine or the like And a lower second mounting member connected to each other by an elastic member so that a liquid chamber is defined between them, and the elastic deformation of the elastic member absorbs vibration from the vibration source side. Things are generally known. In this type of vibration isolator, the partition plate divides the liquid chamber into a pressure receiving chamber in which the hydraulic pressure varies due to elastic deformation of the elastic portion and an equilibrium chamber that absorbs the hydraulic pressure variation in the pressure receiving chamber. Yes.

  Specifically, as shown in FIG. 7, the partition plate 101 is supported by an annular support member 102 provided on the liquid chamber side of the first mounting member 106, and the liquid chamber is separated by the partition plate 101. The pressure receiving chamber 103 and the equilibrium chamber 104 are partitioned. Then, a communication path 105 communicating with the pressure receiving chamber 103 and the equilibrium chamber 104 is formed in the support member 102, and low frequency vibration transmitted from the vibration source side by liquid column resonance in the communication path 105 is generated. Attenuates.

On the other hand, when the vibration input to the vibration isolator is high-frequency vibration, even if the communication passage 105 is provided between the pressure receiving chamber 103 and the equilibrium chamber 104 as described above, the fluid is passed through the communication passage 105. The high-frequency vibration cannot be reduced by the communication path 105 because it hardly moves. Therefore, in the vibration isolator, a part of the partition plate 101 is formed of a rubber plate, and the partition plate 101 is elastically deformed in response to the input high-frequency vibration, so that the hydraulic pressure in the pressure receiving chamber 103 is increased. I try to absorb fluctuations. (See, for example, FIG. 7 in Patent Document 1)
JP 2001-27278 A

  However, as described above, in the conventional vibration isolator, it is necessary to configure a part of the partition plate 101 with a rubber plate or the like in order to absorb high-frequency vibration. Therefore, there is a problem that the manufacturing cost is increased.

  The present invention has been made in view of such points, and the object of the present invention is to provide a simple structure by devising the structure of the partition plate that partitions the liquid chamber in the liquid-filled vibration isolator. The object is to efficiently absorb high-frequency vibrations.

  In order to achieve the above object, according to the solution means of the present invention, the outer peripheral end of the partition plate partitioning the liquid chamber is protruded into the communication passage that fluidly communicates between the pressure receiving chamber and the equilibrium chamber, and the outer peripheral end thereof. The liquid in the communication path was agitated by vibrating the part.

  Specifically, in the first aspect of the invention, the two attachment members respectively connected to the vibration source side and the vibration receiving side and the both attachment members are elastically connected, and the two attachment members are relatively displaced by elastic deformation. The main body portion is constituted by an elastic member to form a liquid chamber filled with liquid in the main body portion, the pressure receiving chamber in which the liquid pressure varies due to elastic deformation of the elastic member, and the pressure receiving pressure A partition plate that partitions the chamber into an equilibrium chamber that absorbs fluid pressure fluctuations; and a communication passage that fluidly communicates between the pressure receiving chamber and the equilibrium chamber in a peripheral wall portion of the liquid chamber that surrounds the outer periphery of the partition plate It is assumed that the vibration isolator is provided. And the said partition plate shall be supported by the surrounding wall part of the said liquid chamber in the outer peripheral part, and the outer peripheral edge part shall penetrate the said surrounding wall part and protrude in the said communicating path.

  With this configuration, when the elastic body bends due to vibration input to the vibration isolator, the volume in the pressure receiving chamber expands and contracts, and the hydraulic pressure in the pressure receiving chamber fluctuates, the partition plate facing the pressure receiving chamber vibrates accordingly, As a result, the outer peripheral end of the partition plate protruding into the communication path also vibrates, and the liquid in the communication path is stirred. As a result, the fluid can easily move in the communication path that connects the pressure receiving chamber and the equilibrium chamber, and even when high-frequency vibration is input, the vibration can be absorbed by the movement of the fluid in the communication path. Therefore, it is possible to effectively absorb high-frequency vibrations with a simple structure without forming part of the partition plate with a rubber member or the like as in the prior art.

  According to a second aspect of the invention, in the first aspect of the invention, the main body portion constitutes at least a part of the peripheral wall portion of the equilibrium chamber, and is a separate elastic membrane that elastically deforms and absorbs the volume fluctuation of the equilibrium chamber. The liquid chamber peripheral wall portion including the members and supporting the partition plate is configured such that the pressure receiving chamber side is constituted by an elastic member and the equilibrium chamber side is constituted by the elastic membrane member.

  As a result, the outer peripheral portion of the partition plate is supported using the elastic member and the elastic membrane member constituting the peripheral wall portion of the liquid chamber in the main body portion, and the outer peripheral end portion of the partition plate is projected into the communication path. The configuration can be easily realized. That is, the operation of claim 1 can be realized with a simpler structure.

  In the invention of claim 3, in any one of the inventions of claim 1 or 2, the outer peripheral end of the partition plate protruding into the communication path divides the communication path into two in the cross section. .

  With this configuration, the inside of the communication path can be divided into two by using the outer peripheral end portion of the partition plate for stirring the fluid in the communication path. This makes it possible to change the flow path length and cross-sectional area of the communication path with a simple structure, and the fluid in each of the divided communication paths can be efficiently stirred by the partition plate.

  In the invention of claim 4, in the invention of claim 2, irregularities are formed on the surface of the outer peripheral end portion of the partition plate protruding into the communication path. Thereby, the fluid in a communicating path can be stirred more efficiently by the uneven | corrugated shape provided in the outer peripheral edge part surface of a partition plate.

  According to the first aspect of the present invention, the outer peripheral end of the partition plate that divides the liquid chamber of the liquid filled type vibration damping device into the pressure receiving chamber and the equilibrium chamber is connected to the pressure receiving chamber and the equilibrium chamber. Since the fluid in the communication passage is stirred by the projecting outer peripheral end portion and the movement is promoted by the projecting outer peripheral end portion, the movement is facilitated, and the vibration in the high frequency range is efficiently absorbed with a simple structure. be able to.

  According to the second aspect of the invention, since the outer peripheral side of the partition plate is supported by the elastic member and the elastic film member that constitute the peripheral wall portion of the liquid chamber, the configuration of the first aspect can be realized with a simpler configuration.

  According to the invention of claim 3, since the communication path is divided into two by the outer peripheral end of the partition plate, the flow path length and cross-sectional area of the communication path can be changed with a simple structure.

  According to the fourth aspect of the present invention, irregularities are formed on the surface of the outer peripheral end of the partition plate so that the fluid in the communication path can be more efficiently agitated. It will be a thing.

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

(Embodiment 1)
As shown in FIGS. 1 and 2, the vibration isolator 10 according to the first embodiment is a liquid-filled type in which a liquid is sealed. For example, a power train such as an automobile engine and a vehicle body In order to support the load of the power train and to attenuate the vibration generated in the power train, the transmission of the vibration to the vehicle body side is suppressed. Specifically, the vibration isolator 10 includes an attachment member 11 connected to a fixed body 4 side (vibration receiving side) such as a vehicle body, and the other side connected to a vibration source side (not shown) such as an engine. A metal casing 12 as an attachment member, an elastic support member 13 as an annular elastic member for connecting the attachment member 11 and the metal casing 12 to each other, and an elastic film member disposed in the casing 12 A diaphragm 20 made of a rubber thin film, and a partition plate 30 sandwiched between the outer periphery of the diaphragm 20 and the upper end of the elastic support member 13 are provided.

  Further, as shown only in FIG. 1, an inverted U-shaped stopper member 1 is disposed so as to straddle the vibration isolator 10 in the front-rear direction of the vehicle, and two front and rear legs of the stopper member 1. A vehicle body side mounting bracket 2 to which the mounting member 11 is fixed is installed between 1b and 1b.

  The stopper member 1 is formed by press-molding a steel plate or the like, for example, and is spaced apart from the upper end of the casing 12 of the vibration isolator 10 by a predetermined distance. When mounted on the vehicle, the beam portion 1a is formed to extend substantially horizontally in the vehicle front-rear direction), and a pair of left and right legs formed to bend downward from the left and right end portions and extend substantially directly below. Parts 1b and 1b. The lower ends of the pair of left and right legs 1b, 1b are bent in the left-right direction to form flanges 1c, 1c. The left and right flanges 1c, 1c are fastened on the fixed body 4 by bolts (not shown). Has been.

  When the vibration isolator 10 is provided with a torque rod for restricting the swing of the power train in the roll direction, one end of the torque rod is used as the stopper member 1 and the other end is used as the anti-vibration device. What is necessary is just to connect with the casing 12 of the apparatus 10 via a rubber bush etc., respectively.

  The casing 12 is made of, for example, an aluminum alloy, and is formed in a thick cylindrical shape arranged in the vertical direction. A rubber layer 14 is provided on the outer peripheral surface at least in the horizontal direction of the drawing. The rubber layer 14 includes an upper bulging portion 14a and a lower bulging portion 14b formed by raising and lowering the upper and lower end portions of the casing 12 in the vertical direction, and an uneven side surface portion formed on the side surface of the casing 12. 14c. With this configuration, the upper bulging portion 14a abuts against the beam portion 1a of the stopper member 1 from below to restrict the upward displacement of the casing 12, while the lower bulging portion 14b The vehicle body side mounting bracket 2 is abutted from above to restrict the downward displacement of the casing 12. Then, the displacement of the casing 12 in the left-right direction (corresponding to the front-rear direction in the vehicle) is regulated by the side surface portion 14c of the rubber layer 14 coming into contact with the left and right leg portions 1b, 1c of the stopper member 1. It has become.

  A flange plate 12a is integrally formed on the surface portion of the casing 12 where the rubber layer 14 is not formed (for example, the front side in FIG. 1) so as to extend in a direction substantially perpendicular to the axis Z. It is connected to the vibration source side via the flange plate 12a.

  The mounting member 11 has a substantially conical shape with an upper concavity, and the upper end of the attachment member 11 is disposed substantially coaxially so as to be located at the approximate center of the lower end opening of the casing 12. An elastic support member 13 is interposed between the side surface portion and the inner peripheral surface of the casing 12 facing the outer periphery thereof. The mounting member 11 is provided with a screw hole (not shown) so as to be recessed from the lower end surface, and is fastened to the vehicle body side mounting bracket 3 by a bolt 3 screwed into the screw hole. It has become.

  A mortar-shaped recess is formed on the inner peripheral side of the lower portion 13 a of the elastic support member 13, and the peripheral surface of the recess is attached to the tapered side surface of the mounting member 11. The member 13 is formed in a substantially truncated cone shape so as to expand radially outward from the entire circumference of the mounting member 11 and extend obliquely upward, and an outer peripheral surface of the upper portion 13b which is an upper portion thereof is formed. It is bonded to the inner peripheral surface of the casing 12. As described above, the upper portion 13b of the elastic support member 13 that is bonded and fixed to the inner periphery of the casing 12 has a relatively thick cylindrical shape that opens upward, and the upper end portion thereof is the upper end portion of the casing 12. It is positioned so as to be lower than the predetermined length.

  Further, as shown in FIG. 2, an annular bulging portion 13c having an inner diameter substantially the same as that of the upper end portion and having a small outer diameter is integrally formed at the upper end portion of the elastic bearing member 13. The outer peripheral surface of the bulging portion 13c constitutes a part of the wall surface of an orifice passage 40 (communication passage) described later.

  And the outer peripheral part 30a of the disk-shaped partition plate 30 is overlaid from the upper part on the bulging part 13c of the said elastic support member 13, Furthermore, it is substantially hat-shaped so that this partition plate 30 whole may be covered from the upper part. A rubber diaphragm 20 is disposed. As a result, the upper end opening of the elastic support member 13 is liquid-tightly closed, and a cavity is formed inside.

  The diaphragm 20 has an outer cylinder portion 22a having an outer diameter substantially the same as the inner diameter of the casing 12 on the outer peripheral side of the substantially hat-shaped main body portion 21, and an inner cylinder continuous to the lower end via a flange portion 22b. The outer peripheral portion 22 is integrally formed with the portion 22c, and the outer peripheral portion 22 has a substantially crank-shaped reinforcement as viewed in a longitudinal section from the outer cylindrical portion 22a to the inner cylindrical portion 22c. An annular ring 23 is embedded, and the outer cylinder portion 22a reinforced thereby is press-fitted into the inner periphery of the upper end side of the casing 12 from above and fixed in an in-fitted state.

  Also, as shown in FIG. 1, a buffer solution such as ethylene glycol is sealed in the cavity formed by the mounting member 11, the casing 12, the elastic support member 13 and the diaphragm 20 as described above. A liquid chamber F for absorbing and mitigating vibrations input to the elastic support member 13 is provided. The interior of the liquid chamber F is divided into upper and lower parts by the partition plate 30, and the lower side thereof is a pressure receiving chamber F <b> 1 whose volume expands or contracts with elastic deformation of the elastic support member 13, while the upper side thereof is The volume of the diaphragm 20 is expanded or reduced by elastic deformation of the diaphragm 20 to become an equilibrium chamber F2 that absorbs a change in volume in the pressure receiving chamber F1.

  An annular orifice passage 40 surrounded by the inner surface of the casing 12, the flange portion 22 b of the diaphragm 20, the inner cylinder portion 22 c, and the bulging portion 13 c of the elastic support member 13 is disposed on the outer periphery of the partition plate 30. A (communication path) is formed so as to extend along the inner surface of the casing 12 over almost the entire circumference in the circumferential direction, and both ends thereof are isolated by a partition wall. As shown in an enlarged view in FIG. 2, both end portions of the orifice passage 40 are respectively provided with a pressure receiving side opening portion 13 d provided in the bulging portion 13 c of the elastic support member 13 and an inner cylinder portion 22 c of the diaphragm 20. The pressure-receiving chamber F1 and the equilibrium chamber F2 are in fluid communication with an equilibrium-side opening 22d provided in the buffer, and the buffer solution flows through the orifice passage 40 between the pressure-receiving chamber F1 and the equilibrium chamber F2. They can move to each other.

  In this way, the pressure receiving chamber F1 and the equilibrium chamber F2 are provided and communicated with each other by the orifice passage 40, so that the following effects can be obtained when the vibration input to the vibration isolator is low frequency vibration. Can be obtained. First, vibration is transmitted to the elastic support member 13 through the casing 12, and the elastic support member 13 is elastically deformed to cause a volume change and a fluid pressure change in the pressure receiving chamber F1. Then, the buffer solution in the pressure receiving chamber F1 and the equilibrium chamber F2 circulates through the orifice passage 40 due to the volume change and the fluid pressure fluctuation of the pressure receiving chamber F1, and vibrates due to the flow resistance at this time. Is attenuated. In particular, if the frequency of vibration is in a predetermined frequency range, liquid column resonance is generated in the orifice passage 40, thereby effectively attenuating the vibration.

  Further, since the outer peripheral end portion 30b further on the outer peripheral side than the outer peripheral portion 30a of the partition plate 30 is disposed so as to protrude into the orifice passage 40, the inner end of the pressure receiving chamber F1 in response to external vibration. When the partition plate 30 facing the pressure receiving chamber F1 is vibrated in the vertical direction due to volume change and fluid pressure fluctuation, the bulging portion 13c of the elastic support member 13 and the inner cylindrical portion 22c of the diaphragm 20 The outer peripheral end 30b of the partition plate 30 also vibrates in the vertical direction with the outer peripheral portion 30a of the partition plate 30 supported by As a result, the buffer solution in the orifice passage 40 is agitated by the outer peripheral end 30b of the partition plate 30, and the flow of the buffer solution in the orifice passage 40 is promoted.

  Therefore, even when a high-frequency vibration in which the buffer solution is relatively difficult to flow through the orifice passage 40 is input, the buffer solution in the pressure receiving chamber F1 moves to the orifice passage 40, so that the pressure receiving chamber F1 The volume fluctuation can be absorbed by the movement of the buffer solution, and the fluid pressure in the pressure receiving chamber F1 does not increase rapidly.

  In this way, the dynamic spring constant Kd of the vibration isolator 10 when the outer peripheral end 30b of the partition plate 30 protrudes into the orifice passage 40 and the buffer solution in the orifice passage 40 is stirred is shown in FIG. Show. According to the figure, when the inside of the orifice passage 40 is not stirred (indicated by a solid line in the figure), there is a phenomenon (dynamic spring jump) in which the dynamic spring constant increases rapidly when the frequency of vibration increases. As can be seen, when the inside of the orifice passage 40 is agitated by the outer peripheral end 30b of the partition plate 30 (shown by a dotted line in the figure), the dynamic spring jump is almost eliminated and stable in almost all frequency regions. Dynamic spring constant can be obtained. That is, as described above, it can be understood that, by stirring the inside of the orifice passage 40, even if high-frequency vibration is input to the vibration isolator 10, the vibration can be effectively absorbed.

  With the above configuration, in the vibration isolator 10 of this embodiment, when vibration is transmitted from the vibration source side, the vibration is transmitted to the elastic support member 13 via the mounting member 11, and the elasticity of the elastic support member 13 is Due to the deformation, the volume of the pressure receiving chamber F1 varies, and thereby the hydraulic pressure in the pressure receiving chamber F1 varies. When the input vibration is a low frequency vibration, the buffer liquid flows in the orifice passage 40 in accordance with the fluid pressure fluctuation in the pressure receiving chamber F1, so that a liquid column resonance occurs in the orifice passage 40. Thus, low frequency vibration can be damped efficiently. On the other hand, when the input vibration is a high-frequency vibration, the outer peripheral end 30b of the partition plate 30 protruding into the orifice passage 40 in response to the vibration of the partition plate 30 caused by the change in the hydraulic pressure in the pressure receiving chamber F1 Since the buffer solution in the orifice passage 40 is vibrated in the up and down direction and the flow of the buffer solution is promoted, the buffer solution in the pressure receiving chamber F1 and the equilibrium chamber F2 is absorbed in the orifice passage 40. The high-frequency vibration can be efficiently absorbed.

  That is, in the structure of the present embodiment, as in the conventional example (the above-mentioned Patent Document 1), the partition plate 30 is not configured with a rubber member or the like in order to absorb high-frequency vibrations. Is sandwiched between the diaphragm 20 and the bulging portion 13c of the elastic support member 13, and a high frequency vibration can be absorbed by a simple configuration in which the outer peripheral end portion 30b of the partition plate 30 protrudes into the orifice passage 40. Therefore, the structure of the partition plate can be simplified, and the manufacturing cost of the vibration isolator can be kept low.

(Embodiment 2)
FIG. 4 shows a cross-sectional structure of the vibration isolator 10 according to the second embodiment of the present invention. The vibration isolator 10 according to the second embodiment has substantially the same configuration as that of the first embodiment (see FIGS. 1 and 2). Yes, since only the structure of the outer peripheral end 30b of the partition plate 30 is different, the same parts are denoted by the same reference numerals and only the different parts will be described below.

  Specifically, in the second embodiment, the outer peripheral end portion 30b of the partition plate 30 protruding into the orifice passage 40 is formed in a substantially L-shaped cross section, and the end portion thereof is on the outer peripheral side of the diaphragm 20. It is fixed to the flange portion 22b, whereby the inside of the orifice passage 40 is divided into two to form a first orifice passage 40a and a second orifice passage 40b. The first orifice passage 40a is at one end thereof via the pressure receiving side opening 13d to the pressure receiving chamber F1, and the second orifice passage 40b is at one end thereof via the balance side opening 22d. While communicating with each of F2, the first orifice passage 40a and the second orifice passage 40b communicate with each other through the opening 30c provided at the outer peripheral end 30b of the partition plate 30 at the other end.

  Note that one end of each of the first orifice passage 40a and the second orifice passage 40b is isolated by a partition wall as in the first embodiment, and the buffer solution moves from the pressure receiving chamber F1 to the equilibrium chamber F2. In this case, the buffer solution moves from the pressure receiving chamber F1 to the first orifice passage 40a, and moves from the first orifice passage 40a to the second orifice passage 40b and the equilibrium chamber F2 through the opening 30c.

  Further, as described above, since the edge portion of the partition plate 30 is fixed to the flange portion 22b of the diaphragm 20, the partition plate 30 facing the pressure receiving chamber F1 vibrates due to the fluid pressure fluctuation of the pressure receiving chamber F1. In this case, the outer peripheral end portion 30b of the partition plate 30 is elastically deformed in the thickness direction in accordance with the vibration, thereby stirring the buffer solution in the orifice passages 40a and 40b.

  With the configuration as described above, as in the first embodiment, the buffer solution in the orifice passages 40a and 40b is agitated at the outer peripheral end portion 30b of the partition plate 30, and the flow thereof is promoted to generate high-frequency vibration. While being able to absorb efficiently, the flow path length of the orifice channel | path 40 and its cross-sectional area can be changed with the simple structure using the outer peripheral edge part 30b of the said partition plate 30. FIG.

(Embodiment 3)
FIG. 5 shows a cross-sectional structure of a vibration isolator 10 according to Embodiment 3 of the present invention. The vibration isolator 10 according to Embodiment 3 has substantially the same configuration as that of Embodiment 1 (see FIGS. 1 and 2). Yes, since only the structure of the outer peripheral end 30b of the partition plate 30 is different, the same parts are denoted by the same reference numerals and only the different parts will be described below.

  Specifically, in the third embodiment, the outer peripheral end 30b of the partition plate 30 protruding into the orifice passage 40 is formed in a substantially L-shaped cross section, and a plurality of surfaces are provided on the outer peripheral end 30b. A convex portion 30d is formed. Thus, by providing a convex shape on the surface of the outer peripheral end portion 30b of the partition plate 30 protruding into the orifice passage 40, the outer peripheral end portion 30b also vibrates according to the vibration of the partition plate 30 facing the pressure receiving chamber F1. In this case, the inside of the orifice passage 40 can be efficiently stirred by the convex shape formed on the surface. That is, even when the input vibration is a high-frequency vibration with a small amplitude, the buffer solution in the orifice passage 40 can be sufficiently stirred, so that an increase in the fluid pressure in the orifice passage 40 is prevented, and the buffer solution The flow can be further promoted.

  Therefore, as described above, a convex shape is provided on the surface of the outer peripheral end portion 30b of the partition plate 30 protruding into the orifice passage 40, so that the space between the pressure receiving chamber F1 and the equilibrium chamber F2 through the orifice passage 40 is provided. Therefore, it is possible to more effectively absorb high-frequency vibrations with a small amplitude.

  In addition, the shape formed on the surface of the outer peripheral end 30b of the partition plate 30 protruding into the orifice passage 40 is not limited to the convex shape as described above, and may be a concave shape or an uneven shape.

(Other embodiments)
The present invention is not limited to the above-described embodiments, but includes other various embodiments. That is, in the second embodiment, the orifice passage 40 is divided into two by the outer peripheral end 30b of the partition plate 30. However, the present invention is not limited to this. For example, as shown in FIG. 6, the inner cylinder 22c of the diaphragm 20 A projecting portion 22e may be provided on the outer periphery to divide the orifice passage 40 into two. Thereby, the flow path length and flow path cross-sectional area of the orifice passage can be changed with a simple configuration.

  Further, in each of the above embodiments, the attachment member 11 is connected to the stationary body side such as the vehicle body, and the casing 12 is connected to the vibration source side such as the engine. The casing 12 may be connected to the fixed body side.

  Furthermore, in each said embodiment, it is set as the structure which clamps the outer peripheral part 30a of the partition plate 30 with the bulging part 13c of the elastic support member 13, and the inner cylinder part 22c of the diaphragm 20, However, It is not this limitation, The said elastic The partition plate 30 may be supported by a member different from the support member 13 and the diaphragm 20.

  As described above, the present invention can absorb high-frequency vibrations with a simple structure using a partition plate that divides a liquid chamber into two in a liquid-sealed vibration isolator. This is particularly useful when vibration in a wide frequency range is input.

It is sectional drawing which shows the whole structure of the vibration isolator which concerns on Embodiment 1 of this invention. It is an enlarged view which expands and shows the structure around the partition plate of a vibration isolator. It is a graph which shows the relationship between the dynamic spring constant Kd at the time of stirring the inside of an orifice channel | path, and a vibration frequency. FIG. 3 is a view corresponding to FIG. 2 according to the second embodiment. FIG. 9 is a view corresponding to FIG. 2 according to the third embodiment. FIG. 3 is a view corresponding to FIG. 2 when the orifice passage is divided into two parts by using a part of the diaphragm. It is sectional drawing which shows the structure of the conventional vibration isolator.

Explanation of symbols

4 Fixed body (vibration receiving side)
10 Vibration isolator 11 Mounting member 12 Casing (mounting member)
13 Elastic bearing member (elastic member)
20 Diaphragm (elastic membrane member)
30 partition plate 30a outer peripheral part 30b outer peripheral end part 30d convex part 40 orifice passage (communication passage)
F Liquid chamber F1 Pressure receiving chamber F2 Equilibrium chamber

Claims (4)

A main body is constituted by two attachment members respectively connected to the vibration source side and the vibration receiving side, and elastically connecting the both attachment members and relatively displacing the both attachment members by elastic deformation, A liquid chamber filled with a liquid is formed in the main body, and the liquid chamber is divided into a pressure receiving chamber in which the hydraulic pressure varies due to elastic deformation of the elastic member, and an equilibrium chamber that absorbs the fluid pressure variation in the pressure receiving chamber. A vibration isolator provided with a partition plate, and further provided with a communication path for fluid communication between the pressure receiving chamber and the equilibrium chamber in a peripheral wall portion of a liquid chamber surrounding the outer periphery of the partition plate;
The partition plate is supported by a peripheral wall portion of the liquid chamber at an outer peripheral portion thereof, and an outer peripheral end portion thereof penetrates the peripheral wall portion and protrudes into the communication path. In claim 1,
The main body portion includes at least a part of the peripheral wall portion of the equilibrium chamber, and includes a separate elastic membrane member that elastically deforms and absorbs the volume variation of the equilibrium chamber,
The liquid chamber peripheral wall portion supporting the partition plate has a pressure receiving chamber side made of an elastic member, and an equilibrium chamber side made of the elastic film member. In any one of Claim 1 or 2,
An anti-vibration device characterized in that an outer peripheral end portion of a partition plate protruding into the communication path bisects the communication path in a cross section thereof. In any one of Claim 1 or 2,
An anti-vibration device characterized in that irregularities are formed on the surface of the outer peripheral end of the partition plate protruding into the communication path.

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