JP2008157384A - Liquid filled vibration absorbing device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid filled vibration absorbing device enabling to suppress the occurrence of abnormal sounds resulting from cavitation by suppressing the occurrence of cavitation itself, and to provide its manufacturing method. <P>SOLUTION: An engine mount as the liquid filled vibration absorbing device comprises a first chamber C1 and a second chamber C2 filled with liquid L and communicated with each other via orifice passages 24C, 24D, a vibration absorbing member 21 connecting an engine side bracket 3 to a vehicle side bracket 4 for increasing/reducing pressure in the first chamber C1 with vibration between the brackets 3, 4, and a diaphragm 122 having a membrane portion 122A to be displaced depending on the amount of liquid in the second chamber C2. Herein, a protecting cover 128 is provided which has a protruded portion 128D for thrusting the membrane portion 122A of the diaphragm 122 in the direction of applying pressure to the second chamber C2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator used for an engine mount for automobiles and a manufacturing method thereof.

  Conventionally, as this type of liquid-filled vibration isolator, for example, there is one described in Patent Document 1. FIG. 3 shows a cross-sectional structure of an engine mount that has been generally used as such a device, including the liquid-filled vibration isolator described in Patent Document 1.

  As shown in FIG. 3, the engine mount includes a mount body 2, an engine side bracket 3 for attaching the mount body 2 to the engine, and a vehicle side bracket 4 for attaching the mount body 2 to the vehicle. Has been.

  The mount body 2 includes a substantially cylindrical bottomed vibration isolating member 21, a diaphragm 22 formed in a dome shape and covering the lower opening shown in FIG. 3 of the vibration isolating member 21, and the inner periphery of these vibration isolating members 21. Including a partition plate 23 and an orifice 24 for partitioning an internal space formed by the surface and the inner peripheral surface of the diaphragm 22 into a first chamber C1 on the vibration isolation member 21 side and a second chamber C2 on the diaphragm 22 side. It consists of Further, a liquid L such as ethylene glycol is sealed in the first chamber C1 and the second chamber C2, and the liquid L is supplied from the first chamber C1 through the orifice passages 24C and 24D formed in the orifice portion 24. It is possible to go to 2 rooms C2 or vice versa.

  Further, the substantially rod-shaped inner member 5 is fixed to the mounting hole 21 </ b> C formed in the vibration isolating member 21 in a state of being vulcanized and bonded. The inner member 5 and the engine side bracket 3 are fixed by bolts 6, whereby the mount body 2 is attached to the engine via the engine side bracket 3. The mount body 2 is attached to the vehicle via the vehicle side bracket 4 by fixing the outer cover 26 attached to the outside of the vibration isolation member 21 to the vehicle side bracket 4.

In a vehicle equipped with such an engine mount, for example, when a force for moving the engine downward as shown in FIG. 3 is applied to the vehicle during traveling, the force to pressurize the first chamber C1. Will increase the pressure of the sealed liquid L. However, in this case, the liquid L in the first chamber C1 is pressurized, and a part thereof moves to the second chamber C2 through the orifice passages 24C and 24D. The amount of liquid increases in the second chamber C2, but the volume change of the second chamber C2 is allowed through the displacement of the flexible diaphragm 22. On the other hand, when a force for moving the engine upward as shown in FIG. 3 is applied to the vehicle, the liquid enclosed in the first chamber C1 is applied with a force for reducing the pressure. The pressure of L will fall. However, in this case, as the pressure in the first chamber C1 decreases, a part of the liquid L in the second chamber C2 moves to the first chamber C1 through the orifice passages 24C and 24D. The amount of liquid is reduced in the second chamber C2, but the volume change of the first chamber C1 is allowed through the displacement of the flexible diaphragm 22. Therefore, vibration generated between the engine side bracket 3 and the vehicle side bracket 4 connected via the vibration isolation member 21 is absorbed through the movement of the liquid L between the first chamber C1 and the second chamber C2. Become so.
Japanese Patent Laid-Open No. 2004-263788

  By the way, in such a liquid filled type vibration isolator, vibration can be surely suppressed through movement of the liquid L between the first chamber C1 and the second chamber C2. However, in the conventional liquid-filled vibration isolator, the orifice passages 24C and 24D serve as flow path resistances. Therefore, when a force for reducing the pressure is applied to the first chamber C1, the first chamber C1. The moving speed of the liquid through the orifice passages 24C and 24D is delayed with respect to the changing speed of the volume. As a result, the pressure suddenly decreases in the first chamber C1, and a part of the liquid L may be bubbled. Thereafter, when a force for pressurizing the first chamber C1 is applied to the first chamber C1, so-called cavitation occurs, in which bubbles bounce and disappear. At this time, there is a problem that an abnormal sound is generated when the shock wave accompanying the disappearance of the bubbles vibrates each component constituting the mount body 2.

  In the liquid-filled vibration isolator described in Patent Document 1, in order to prevent the partition plate 23 from vibrating due to a shock wave accompanying cavitation, a damper is provided in the first chamber C1 to prevent cavitation. The generation of abnormal noise is suppressed. However, since the one described in this document does not suppress the occurrence of cavitation itself, there is still room for improvement in suppressing the occurrence of abnormal noise caused by cavitation.

  The present invention has been made in view of such circumstances, and the object thereof is to provide a liquid-filled vibration isolator capable of suppressing the occurrence of abnormal noise caused by cavitation by suppressing the occurrence of cavitation itself, and its manufacture. It is to provide a method.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to the first aspect of the present invention, the first chamber and the second chamber, in which liquid is sealed and communicated through the orifice, are connected to a plurality of mounting members, and the first chamber is pressurized and depressurized by vibration between the mounting members. In a liquid-filled vibration isolator comprising a vibration isolating member that performs and a flexible membrane having a membrane portion that is displaced according to the amount of liquid in the second chamber, the flexibility in the direction in which the second chamber is pressurized The gist is to include a pressing member that presses the film portion of the film.

  According to this configuration, since the second chamber is pressurized by pressing the membrane portion of the flexible membrane by the pressing member, the conventional liquid-filled vibration isolator without pressing the second chamber The pressure of the liquid sealed in the first chamber and the second chamber is higher than that of the first chamber. For this reason, even when the force for depressurizing the first chamber acts on the vibration isolation member, the pressure of the liquid in the first chamber can be maintained higher than that of the conventional device, and bubbles are generated in the first chamber. Generation | occurrence | production can be suppressed now. Thereby, generation | occurrence | production of the abnormal noise resulting from cavitation can be suppressed by suppressing generation | occurrence | production of cavitation itself.

  According to a second aspect of the present invention, in the liquid-filled vibration isolator according to the first aspect, the protrusion is formed on an inner peripheral surface of a protective cover that covers the film portion of the flexible film. That is the gist.

  According to this configuration, the function of the pressing member that presses the flexible membrane can be provided to the protective cover of the flexible membrane that is generally used in the past. An increase in the score can be suppressed. The protrusions that press the membrane portion of the flexible membrane include a projection that is formed on the protective cover so that the membrane portion presses when the protective cover is assembled, or a protective cover. After assembling, the protective cover can be deformed to press the membrane part.

  According to a third aspect of the present invention, in the liquid-filled vibration isolator according to the first aspect, the pressing member is disposed between the film portion of the flexible film and the inner peripheral surface of the protective cover covering the flexible film. The gist is that the elastic member is provided and biases the membrane portion.

  According to this configuration, the membrane portion can be pressed using the biasing force of the elastic member provided between the membrane portion of the flexible membrane and the inner peripheral surface of the protective cover that covers the membrane portion. By appropriately adjusting the degree of compression of the member, the force for pressing the membrane portion of the flexible membrane, that is, the pressure of the liquid sealed in the first chamber and the second chamber can be accurately controlled.

  In the invention according to claim 3, wherein the elastic member is provided between the membrane portion of the flexible membrane and the inner peripheral surface of the protective cover that covers the membrane portion, the membrane portion is brought into direct contact with the elastic member. There is a risk of damage.

  In this regard, according to the invention described in claim 4, since the protective sheet for protecting the membrane portion is interposed between the membrane portion and the elastic member, the membrane portion is directly connected to the elastic member. Can be protected from damage caused by contact.

  According to a fifth aspect of the present invention, there is provided a step of forming a first chamber and a second chamber communicating with each other through an orifice, a step of enclosing a liquid in the first chamber and the second chamber, and the first chamber in response to vibration. A step of attaching a vibration isolating member for increasing and decreasing pressure, a step of attaching a flexible membrane having a membrane portion that is displaced according to the amount of liquid in the second chamber, and a step of adding the second chamber after all the steps are completed. The gist is to include a pressing step of pressing the film portion of the flexible film in the pressing direction.

  According to the process, after the first chamber and the second chamber are formed and liquid is sealed in them, the membrane portion of the flexible film is pressed in the direction in which the second chamber is pressurized. The pressure of the liquid sealed in the first chamber and the second chamber can be increased as compared with the conventional liquid-filled vibration isolator in which the two chambers are not pressurized. As a result, it is possible to manufacture a liquid-filled vibration isolator that exhibits the same effects as the first aspect of the invention. In addition, about processes other than the said press process, the order of these processes can be changed, for example, the process of forming a 1st chamber, and the process of attaching a vibration isolating member may be substantially the same.

  Specifically, according to the invention described in claim 6, after the pressing step, the protective cover is attached to the outside of the flexible membrane, and then the protective cover is deformed by pressure from the outside. It is possible to adopt a process in which the inner peripheral surface of the film presses the film portion.

<First Embodiment>
Hereinafter, a liquid filled type vibration damping device and a manufacturing method thereof according to the present invention will be described with reference to FIG. 1 for a first embodiment in which the engine mount and the manufacturing method thereof are embodied.

FIG. 1 is a cross-sectional view showing a cross-sectional structure of the engine mount of this embodiment.
As shown in FIG. 1, the engine mount includes a mount main body 102, an engine side bracket 3 for attaching the mount main body 102 to the engine, and a vehicle side bracket 4 for attaching the mount main body 2 to the vehicle. It is configured.

  The mount main body 102 includes a bottomed cylindrical vibration-proof member 21, a diaphragm 122 provided so as to cover the lower opening shown in FIG. 1 of the vibration-proof member 21, and an inner peripheral surface and a diaphragm of these vibration-proof members 21. A partition plate 23 and an orifice portion 24 for partitioning an internal space formed by the inner peripheral surface of 122 into two liquid chambers C1 and C2 are configured. Among these liquid chambers C1 and C2, one liquid chamber in which the inner peripheral surface of the bottom 21A of the vibration isolating member 21 forms the wall surface of the liquid chamber, that is, the upper liquid chamber in FIG. The other liquid chamber whose inner peripheral surface forms the wall surface of the liquid chamber, that is, the lower liquid chamber in FIG. 1, is referred to as a second chamber C2. A liquid L such as ethylene glycol is sealed in the first chamber C1 and the second chamber C2.

  The vibration isolation member 21 is entirely formed of rubber, and is formed thick and has a bottom portion 21A having a vibration isolation function. The vibration isolation member 21 is formed in a substantially cylindrical shape, and an orifice portion 24 is fitted on the inner peripheral surface thereof. And a cylindrical portion 21B. Of these, the bottom 21A is formed with a mounting hole 21C to which the inner member 5 having a substantially conical tip is bonded at a portion facing the engine side bracket 3, that is, an upper portion in FIG.

  The diaphragm 122 is entirely formed in a dome shape by rubber, and includes a membrane portion 122A that forms the center portion of the dome and an attachment portion 122B that forms the end portion of the dome. Among these, the film portion 122A is formed to be sufficiently thin as compared with the vibration isolating member 21, and can be deformed by a pressure change acting on itself. The diaphragm 122 is attached so that the top of the dome is positioned on the lower side shown in FIG. 1 and the outer peripheral surface of the attachment portion 122B is in contact with the inner peripheral surface of the orifice portion 24.

  The orifice portion 24 is formed in a substantially cylindrical shape as a whole, and is formed in a substantially annular shape and an outer cylindrical portion 24A that is formed in a substantially cylindrical shape and abuts against the inner peripheral surface of the cylindrical portion 21B of the vibration isolation member 21. An inner ring portion 24B formed integrally therewith is provided inside the outer cylinder portion 24A. Of these, the inner ring portion 24B is formed with orifice passages 24C and 24D communicating the first chamber C1 and the second chamber C2. A disc-shaped partition plate 23 is attached to the inner peripheral surface of the inner ring portion 24B without any gap.

  A metal case 25 formed in a substantially cylindrical shape is externally fitted on the side surfaces of the bottom portion 21 </ b> A and the cylinder portion 21 </ b> B of the vibration isolation member 21. A metal protective cover 128 for protecting the membrane portion 122A of the diaphragm 122 from an external impact is attached to the outer peripheral surface of the lower end portion shown in FIG. The protective cover 128 is formed in a cup shape, and communication holes 128 </ b> B and 128 </ b> C for communicating the inside and the outside thereof are formed in the bottom portion 128 </ b> A. Further, a protrusion 128D is formed on the inner peripheral surface of the bottom portion 128A so as to protrude toward the film portion 122A of the diaphragm 122, and the film portion 122A adds the second chamber C2 by the protrusion 128D. It is pressed in the pressing direction.

  Further, an outer cover 26 for protecting the vibration isolating member 21 is fitted on a portion of the outer peripheral surface of the case 25 corresponding to the side surface of the bottom 21 </ b> A of the vibration isolating member 21. The outer cover 26 is formed with an insertion hole 26 </ b> A for inserting the inner member 5 at the center of the bottom thereof. Further, the outer cover 26 has a connection portion 26 </ b> B whose side end is enlarged in diameter, and is attached in a state where the outer peripheral surface of the connection portion 26 </ b> B is in contact with the inner peripheral surface of the vehicle side bracket 4. ing.

  The inner member 5 and the engine side bracket 3 are fixed by bolts 6, whereby the mount body 2 is attached to the engine via the engine side bracket 3. Further, the connecting portion 26 </ b> B of the outer cover 26 is fixed to the vehicle side bracket 4, so that the mount body 102 is attached to the vehicle via the vehicle side bracket 4.

Next, a procedure for assembling the mount body 102, particularly a procedure for assembling the protective cover 128 will be described.
When assembling the mount body 102, first, in the state of being immersed in the liquid L, the outer cylinder portion 24A of the orifice portion 24 having the partition plate 23 attached to the inner peripheral surface of the cylinder portion 21B of the vibration isolation member 21 and The attachment part 122B of the diaphragm 122 is attached. Thereby, the first chamber C1 and the second chamber C2 are formed, and the inside thereof is filled with the liquid L.

  Next, the structure assembled as described above is taken out from the liquid L, the case 25 is attached to the side surface of the vibration isolation member 21, and the protective cover 128 is attached to the side surface of the case 25. In such a state, by caulking the case 25 together with the protective cover 128, the protective cover 128, the case 25, the vibration isolating member 21, the orifice portion 24, and the diaphragm 122 are integrally fixed, and the liquid filled in these parts L will not leak outside.

  Here, in this embodiment, next, the bottom portion 128A of the protective cover 128 is pressure-deformed from the outside. As a result, the membrane portion 122A of the diaphragm 122 is pressed by the protrusion 128D formed by the deformation of the bottom portion 128A.

  In a vehicle equipped with such an engine mount, as described above, for example, when a force that moves the engine downward as shown in FIG. The pressure of the liquid L enclosed by the force which pressurizes will rise. However, in this case, the liquid L in the first chamber C1 is pressurized, and a part thereof moves to the second chamber C2 through the orifice passages 24C and 24D. The amount of liquid increases in the second chamber C2, but the volume change of the second chamber C2 is allowed through the displacement of the membrane portion 122A of the diaphragm 122. On the other hand, when a force for moving the engine upward as shown in FIG. 1 is applied to the vehicle, the liquid enclosed in the first chamber C1 is applied with a force for reducing the pressure. The pressure of L will fall. However, in this case, as the pressure in the first chamber C1 decreases, a part of the liquid L in the second chamber C2 moves to the first chamber C1 through the orifice passages 24C and 24D. The amount of liquid in the second chamber C2 decreases, but the volume change in the first chamber C1 is allowed through the displacement of the membrane portion 122A of the diaphragm 122.

  Therefore, vibration generated between the engine side bracket 3 and the vehicle side bracket 4 connected via the vibration isolation member 21 is absorbed through the movement of the liquid L between the first chamber C1 and the second chamber C2. Become so.

  Here, in the engine mount of this embodiment, the membrane portion 122A of the diaphragm 122 is pressed in the direction in which the second chamber C2 is pressurized by the protrusion 128D formed on the inner peripheral surface of the protective cover 128. Therefore, the pressure of the liquid L sealed in the first chamber C1 and the second chamber C2 is higher than that of a conventional engine mount in which the second chamber C2 is not pressurized. For this reason, even if the force which decompresses the 1st chamber C1 acts on the vibration proof member 21, the pressure of the liquid L in the 1st chamber C1 will be kept higher compared with the conventional apparatus.

According to the liquid filled type vibration isolator and the manufacturing method thereof according to this embodiment described above, the effects listed below can be obtained.
(1) The projection 128D is formed on the inner peripheral surface of the protective cover 128, and the membrane portion 122A of the diaphragm 122 is pressed in the direction in which the second chamber C2 is pressurized by the projection 128D. Thereby, it becomes possible to suppress the generation of bubbles in the first chamber C1. As a result, the generation of cavitation itself can be suppressed and the generation of abnormal noise due to cavitation can be suppressed.

(2) The function of pressing the membrane portion 122A of the diaphragm 122 can be provided to the protective cover 128 of the diaphragm 122 that is generally used in the related art, and the configuration for pressing the membrane portion 122A of the diaphragm 122 is additionally provided. An increase in the number of parts can be suppressed.
<Second Embodiment>
Next, a second embodiment of the liquid-filled vibration isolator according to the present invention will be described with reference to FIG. 2 focusing on the differences from the first embodiment.

  FIG. 2 is a sectional view showing the sectional structure of an engine mount according to a second embodiment of the present invention. In FIG. 2, the same elements as those shown in FIGS. 1 and 3 are denoted by the same reference numerals, and the corresponding elements are denoted by the corresponding reference numerals. I will not repeat the explanation of the elements.

  As shown in FIG. 2, also in this embodiment, the outer peripheral surface of the lower end portion shown in FIG. 2 in the case 25 is made of metal for protecting the membrane portion 222A of the diaphragm 222 from external impact. A protective cover 228 is attached. However, in this embodiment, unlike the configuration of the first embodiment in which the protective cover 228 itself directly presses the membrane portion 222A of the diaphragm 222, the outer peripheral surface of the membrane portion 222A and the inner peripheral surface of the protective cover 228 The membrane portion 222A is urged by a spring 230 interposed therebetween.

  Specifically, the protective cover 228 has a recess 228D for fixing the spring 230 to the inner peripheral surface of the bottom 228A. A metal coil spring is used as the spring 230. A protective sheet 232 made of resin having wear resistance is interposed between the spring 230 and the membrane portion 222A of the diaphragm 222.

  According to such a configuration, since the membrane portion 222A of the diaphragm 222 is pressed by the spring 230 in the direction in which the second chamber C2 is pressurized, the first chamber compared to the conventional engine mount in which the second chamber C2 is not pressurized. The pressure of the liquid L enclosed in the chamber C1 and the second chamber C2 increases. For this reason, even if the force which decompresses the 1st chamber C1 acts on the vibration proof member 21, the pressure of the liquid L in the 1st chamber C1 will be kept higher compared with the conventional apparatus.

According to the liquid filled type vibration isolator and the manufacturing method thereof according to this embodiment described above, the effects listed below can be obtained.
(1) A configuration in which the spring 230 is provided between the outer peripheral surface of the diaphragm 222 and the inner peripheral surface of the protective cover 228 to press the film portion 122A of the diaphragm 122 in the direction in which the second chamber C2 is pressed by the spring 230. It was. Thereby, it becomes possible to suppress the generation of bubbles in the first chamber C1. As a result, the generation of cavitation itself can be suppressed and the generation of abnormal noise due to cavitation can be suppressed. Further, for example, by appropriately adjusting the degree of compression of the spring 230, the force for pressing the membrane portion 222A of the diaphragm 222, that is, the pressure of the liquid L sealed in the first chamber C1 and the second chamber C2 is accurately controlled. be able to.

  (2) When the spring 230 is provided between the outer peripheral surface of the diaphragm 222 and the inner peripheral surface of the protective cover 228, the diaphragm 222 may be damaged by direct contact with the spring 230.

  In this regard, according to the above-described embodiment, since the protective sheet 232 is interposed between the diaphragm 222 and the spring 230, the diaphragm 222 can be protected from damage due to direct contact with the spring 230. it can.

  Note that the liquid-filled vibration isolator and the manufacturing method thereof according to the present invention are not limited to the configurations exemplified in the above-described embodiment, but the embodiment is appropriately changed, for example, as follows. It can also be implemented.

  In the second embodiment, the configuration in which the protective sheet 232 is interposed between the diaphragm 222 and the spring 230 has been illustrated, but damage to the diaphragm 222 due to direct contact with the spring 230 may be ignored. If possible, these protective sheets can be omitted.

  In the second embodiment, the metal coil spring 230 is illustrated, but the elastic member that biases the diaphragm 222 is not limited to this, and the diaphragm 222 is attached by, for example, a lump-shaped rubber. You may make it rush.

  In the first embodiment, after the protective cover 128 is attached to the outside of the diaphragm 122, the protective cover 128 is pressure-deformed from the outside to form the protrusion 128D on the inner peripheral surface of the protective cover 128. At the same time, the membrane portion 122A of the diaphragm 122 is pressed by the projection 128D. However, such a protrusion does not necessarily need to be formed after the protective cover 128 is assembled. Before the protective cover 128 is assembled, a protrusion is formed on the inner peripheral surface of the protective cover, and the protective cover is assembled. In this case, the protrusion may press the membrane portion of the diaphragm.

  In each of the above embodiments, the diaphragms 122 and 222 are employed as an example of the flexible film. However, the flexible film is not limited to the diaphragm, and has a film part that is displaced according to the amount of liquid. If so, its shape and material can be changed as appropriate.

  In each of the above embodiments, the space formed by the inner peripheral surface of the vibration isolation member 21 and the inner peripheral surface of the diaphragm is divided into two chambers, the first chamber C1 and the second chamber C2, by the partition plate 23 and the orifice portion 24. Although illustrated about what is divided into a liquid chamber, the liquid chamber of the liquid enclosure type vibration isolator of this invention is not restricted to two. In addition, for example, the second chamber C2 may be further divided into two by another partition plate and another orifice member, so as to have three liquid chambers.

  In each of the above embodiments, the engine mount provided between the engine and the vehicle has been illustrated, but the liquid-filled vibration isolator of the present invention is not limited to that applied to the engine mount, and a plurality of If an attachment member is connected and provided between these attachment members, the attachment object as a vibration isolator can be changed arbitrarily.

  In each of the above embodiments, the configuration in which the film portion of the flexible film is pressed by the protrusion 128D of the protective cover 128 or the spring 230 is adopted, but the configuration for pressing the film portion is not limited to this. .

  In short, what is necessary is just to provide the pressing member which presses the film | membrane part of a flexible film | membrane in the direction which pressurizes a 2nd chamber.

Sectional drawing which showed the cross-sectional structure about 1st Embodiment of the liquid enclosure type vibration isolator concerning this invention. Sectional drawing which showed the cross-sectional structure about 2nd Embodiment of the liquid enclosure type vibration isolator concerning this invention. Sectional drawing which showed the cross-sectional structure about the conventional liquid enclosure type vibration isolator.

Explanation of symbols

2, 102, 202 ... mount body, 21 ... anti-vibration member, 21A ... bottom, 21B ... cylindrical part, 21C ... mounting hole, 22, 122, 222 ... diaphragm, 22A, 122A, 222A ... membrane part, 122B, 222B ... Mounting part, 23 ... Partition plate, 24 ... Orifice part, 24A ... Outer cylinder part, 24B ... Inner ring part, 24C, 24D ... Orifice passage, 25 ... Case, 26 ... Outer cover, 26A ... Insertion hole, 26B ... Connection part , 28, 128, 228 ... protective cover, 128A, 228A ... bottom, 128B, 128C, 228B, 228C ... communication hole, 128D ... projection, 228D ... recess, 230 ... spring, 232 ... protective sheet, 3 ... engine side bracket 4 ... Vehicle side bracket, 5 ... Inner member, 6 ... Bolt.

Claims (6)

A first chamber and a second chamber that contain liquid and communicate with each other through an orifice; a vibration isolating member that connects a plurality of attachment members and pressurizes and depressurizes the first chamber by vibration between the attachment members; In a liquid-filled vibration isolator comprising a flexible membrane having a membrane portion that is displaced according to the amount of liquid in the room,
A liquid-filled vibration isolator comprising a pressing member that presses the film portion of the flexible film in a direction in which the second chamber is pressed. The liquid-filled vibration isolator according to claim 1,
The liquid sealing type vibration damping device, wherein the pressing member is a protrusion formed on an inner peripheral surface of a protective cover that covers a film portion of the flexible film. The liquid-filled vibration isolator according to claim 1,
The pressure member is an elastic member provided between a membrane portion of the flexible membrane and an inner peripheral surface of a protective cover covering the flexible membrane, and biases the membrane portion. Shaker. The liquid-filled vibration isolator according to claim 3, wherein a protective sheet for protecting the film part is interposed between the film part and the elastic member. Forming a first chamber and a second chamber in communication through an orifice;
Enclosing a liquid in the first chamber and the second chamber;
Attaching a vibration isolating member that pressurizes and depressurizes the first chamber in response to vibration;
Attaching a flexible membrane having a membrane portion that is displaced according to the amount of liquid in the second chamber;
And a pressing step for pressing the membrane portion of the flexible membrane in a direction to pressurize the second chamber after all the steps are completed. . In the manufacturing method of the liquid enclosure type vibration isolator of Claim 5,
The pressing step includes a step of attaching a protective cover to the outside of the flexible membrane and then pressurizing and deforming the protective cover from the outside so that the inner peripheral surface of the protective cover presses the membrane portion. A method for manufacturing a liquid-filled type vibration damping device.

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