JP7146546B2 - Fluid-filled anti-vibration device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled vibration damping device used for, for example, engine mounts, body mounts, and member mounts of automobiles.

2. Description of the Related Art Conventionally, a fluid chamber separated by a partition member is provided as a type of vibration-isolating support or vibration-isolating connection that is interposed between members constituting a vibration transmission system and couples these members to each other in a vibration-isolating manner. Fluid-filled vibration isolators are known. For example, in a fluid-filled vibration damping device disclosed in Japanese Patent Publication No. 62-53735 (Patent Document 1), a movable plate is accommodated in a partition member so as to be displaceable in the plate thickness direction. Fluctuations are absorbed and reduced by a movable plate.

However, in such a fluid-filled vibration damping device, abnormal noise and vibration may occur when the movable plate displaced by the input of vibration hits the partition member.

Japanese Patent Publication No. 62-53735

The problem to be solved by the present invention is to provide a fluid-filled anti-vibration device with a novel structure that can reduce or prevent problems such as abnormal noise and vibration caused by a movable body hitting a partition member. to do.

Hereinafter, aspects of the present invention that have been made to solve such problems will be described. It should be noted that the constituent elements employed in each aspect described below can be employed in any possible combination.

A first aspect of the present invention is a fluid-filled vibration damping device having fluid chambers separated by a partition member, wherein the partition member is formed with a storage area for displaceably accommodating a movable body with a gap therebetween. , the accommodation area is communicated with each one of the fluid chambers through communication holes that are opened in opposing positions in the walls on both sides of the accommodation area, and a portion of each of the movable bodies that abuts against the one wall. is an elastic body with a spherical surface, and there are provided a plurality of accommodation areas in which the movable bodies are accommodated, and the plurality of movable bodies include ones of different sizes. It is a thing.

According to the fluid-filled vibration damping device constructed according to this aspect, the contact area between the movable body and the partition member and the magnitude of the force at the time of contact can be changed by varying the size of the movable body. It can be adjusted for each body, and the hammering sound and vibration (frequency etc.) at the time of contact can be dispersed.

A second aspect of the present invention is a fluid-filled vibration damping device having fluid chambers separated by a partition member, wherein the partition member is formed with a storage area for displaceably accommodating a movable body with a gap therebetween. , the accommodation area is communicated with each one of the fluid chambers through communication holes that are opened in opposing positions in the walls on both sides of the accommodation area, and a portion of each of the movable bodies that abuts against the one wall. is an elastic body with a spherical surface, and a plurality of accommodation areas are provided in which the movable bodies are accommodated, and the plurality of movable bodies are made of different materials. is.

According to the fluid-filled anti-vibration device constructed according to this mode, by using different materials for the movable bodies, the magnitude of the contact force between the movable body and the partition member can be adjusted for each movable body. It is possible to disperse the hammering sound and vibration (frequency etc.) at the time of contact.

A third aspect of the present invention is the fluid-filled vibration damping device according to the first or second aspect, wherein the movable body is spherical.

According to the fluid-filled vibration damping device constructed according to this mode, regardless of the directionality (rotational displacement state) of the movable body, it can be brought into contact with the partition member in a desired substantially constant state. It becomes possible.

According to the fluid-filled vibration damping device constructed according to the present invention, since the movable body contacts the partition member with a substantially linear small area through the contact portion formed of the elastic body, The hammering sound and vibration can be reduced or prevented.

FIG. 5 is a longitudinal sectional view showing a fluid-filled vibration damping device as one embodiment of the present invention, which corresponds to the II section in FIG. 4; FIG. 2 is a perspective view showing a partition member constituting the fluid-filled vibration damping device shown in FIG. 1; FIG. 3 is an exploded perspective view of the partition member shown in FIG. 2; FIG. 3 is a plan view of the partition member shown in FIG. 2; VV sectional view in FIG. FIG. 3 is a plan view showing a partition member main body constituting the partition member shown in FIG. 2; VII-VII cross-sectional view in FIG. FIG. 3 is a plan view showing a lid member constituting the partition member shown in FIG. 2; IX-IX cross-sectional view in FIG.

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

First, FIG. 1 shows an engine mount 10 for an automobile as an embodiment of a fluid-filled vibration damping device according to the present invention. This engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected by a main rubber elastic body 16 . By attaching the first mounting member 12 to the power unit side and the second mounting member 14 to the vehicle body side, the power unit is interposed between the power unit and the vehicle body. Anti-vibration support is provided. In the following description, the vertical direction and the axial direction refer to the vertical direction in FIG. 1, which is the axial direction of the mount.

More specifically, the first mounting member 12 has an inverted, substantially truncated conical shape as a whole, and is a rigid member made of metal or hard synthetic resin. The first mounting member 12 has a threaded hole 18 drilled on the central axis from the upper end surface. A substantially annular outer peripheral flange portion 20 projecting outward is integrally formed on the upper end portion of the first mounting member 12, and the portion below the outer peripheral flange portion 20 gradually tapers downward. The lower protrusion 22 has a tapered outer peripheral surface with a smaller diameter.

The second mounting member 14 has a substantially cylindrical shape with a large diameter as a whole, and is a rigid member made of metal or hard synthetic resin. An annular stepped portion 24 that spreads in the direction perpendicular to the axis is provided at an intermediate portion in the vertical direction of the second mounting member 14, and a large-diameter cylindrical portion 26 is formed above the stepped portion 24. A small-diameter cylindrical portion 28 is formed below the stepped portion 24 . An inner peripheral flange portion 30 is provided at the lower opening edge portion of the second mounting member 14 so as to protrude toward the inner peripheral side with a predetermined width.

The first mounting member 12 is disposed axially above the second mounting member 14 and substantially coaxial with the second mounting member 14 . A second mounting member 14 is connected by a main rubber elastic body 16 .

The main rubber elastic body 16 has a substantially truncated cone shape, and has a tapered outer peripheral surface whose diameter gradually decreases upward in the axial direction. Then, in a state in which the lower protrusion 22 of the first mounting member 12 is embedded in the small-diameter end of the main rubber elastic body 16, the small-diameter end of the main rubber elastic body 16 is attached to the first mounting member. The lower protrusion 22 of the member 12 is overlapped and vulcanized over substantially the entire outer peripheral surface of the member 12 .

In addition, the large-diameter side end of the main rubber elastic body 16 is overlapped over substantially the entire inner peripheral surface of the large-diameter cylindrical portion 26 of the second mounting member 14 and vulcanization-bonded.

In this embodiment, the main rubber elastic body 16 is configured as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14 . The upper opening of the second mounting member 14 is covered with a main rubber elastic body 16 in a fluid-tight manner.

A large-diameter recess 32 is formed in the large-diameter side end portion of the main rubber elastic body 16 in an inverted, substantially mortar shape. The inner peripheral surface of the small-diameter tubular portion 28 of the second mounting member 14 is covered with a seal rubber layer 34 .

Further, a partition member 38 and a flexible film 40 are fitted and assembled to the second mounting member 14 from the lower opening. By covering the opening on the lower side of the second mounting member 14 with the flexible film 40 , a liquid chamber 42 is formed between the axially facing surfaces of the main rubber elastic body 16 and the flexible film 40 . is made. Furthermore, the liquid chamber 42 is filled with an incompressible fluid such as water, alkylene glycol, polyalkylene glycol, or silicone oil. In this embodiment, a low-viscosity fluid of 0.1 Pa·s or less is preferably employed as the enclosed fluid.

Further, the liquid chamber 42 is partitioned by a partition member 38 having a substantially disc shape. That is, a first fluid chamber 44 as a fluid chamber is formed above the partition member 38 extending in the axis-perpendicular direction, the wall portion of which is partly composed of the main rubber elastic body 16 . Below the partition member 38, a second fluid chamber 46 is formed as a fluid chamber whose wall portion is partially composed of the flexible film 40. The first fluid chamber 44 and the second is separated from the fluid chamber 46 by the partition member 38 . In this embodiment, the first fluid chamber 44 constitutes a pressure-receiving chamber to which vibration is input, and the second fluid chamber 46 constitutes a balance chamber in which a volume change is easily allowed. Of course, these first and second fluid chambers 44 and 46 are not limited to the pressure receiving chamber and the equilibrium chamber, and may be any chambers that cause relative pressure fluctuations upon vibration input.

The flexible film 40 is made of a rubber film in the shape of a thin disk that has slack so that it can be easily deformed. A ring fitting 48 having a substantially annular shape is vulcanized and bonded to the outer peripheral edge of the flexible film 40 . A ring metal fitting 48 having a flexible film 40 is inserted into the lower end opening of the second mounting member 14 and fixed by the small-diameter tubular portion 28 and the inner peripheral flange portion 30 via the seal rubber layer 34 . The flexible membrane 40 is assembled to the second mounting member 14 by being supported.

As shown in FIGS. 2 to 5, the partition member 38 is composed of a thick, generally disk-shaped partition member main body 50 and a thin, generally disk-shaped cover member 52 superposed thereon from above. are assembled in a mutually fixed state. The partition member main body 50 and the lid member 52 can be suitably formed of metal, hard synthetic resin, or the like.

A first orifice passage 56 formed by covering a circumferential groove 54 extending in the circumferential direction on the outer peripheral surface of the partition member 38 with the small-diameter cylindrical portion 28 of the second mounting member 14 opens the first fluid chamber. 44 and a second fluid chamber 46 are in communication with each other. Therefore, when vibration is input while the engine mount 10 is mounted on the vehicle, the relative pressure fluctuations induced between the first fluid chamber 44 and the second fluid chamber 46 cause the first vibration to occur. Fluid flow through the orifice passage 56 is allowed to occur. Based on the fluid flow action through the first orifice passage 56, the length and cross-sectional area of the first orifice passage 56 are adjusted so as to improve the anti-vibration performance against low-frequency, large-amplitude vibration such as engine shake. etc. are tuned.

Further, a central space 58 is formed in the central portion of the partition member 38, and a relief valve 60 and a coil spring 62 are accommodated therein. The central cavity 58 is formed by covering the circular central recess 64 of the partition member body 50 with the lid member 52, and the lower through holes 66, 66 in the bottom wall of the central recess 64 and the lid member are formed. A short-circuit flow path 70 is formed by communicating with both fluid chambers 46 and 44 through the upper through-holes 68 and 68 of 52 . A plurality of positioning protrusions 72 (three in this embodiment) extending in the depth direction are formed on the inner peripheral surface of the central recess 64 to secure a flow path around the relief valve 60. It is designed to guide up and down. The relief valve 60 is urged downward by the urging force of the coil spring 62 and positioned so as to cover the lower through holes 66 , 66 .

When an impact load is applied to the engine mount 10 and a large negative pressure is generated in the first fluid chamber 44, the relief valve 60 is displaced upward against the urging force of the coil spring 62, causing a short circuit. By opening the channel 70, the negative pressure in the first fluid chamber 44 is quickly eliminated. This prevents noise caused by cavitation when a large impact load is applied.

6 and 7, the partition member main body 50 is provided with a plurality of circular recesses 74 and lower communication holes 76, which are spaced apart from each other in the radial direction and the circumferential direction. It is Particularly in this embodiment, the plurality of circular recesses 74 and the lower communicating holes 76 are of different sizes, and the circular recesses 74 are replaced by a large circular recess 74a with large diameter and depth dimensions. and a small circular recess 74b with small diameter and depth. Correspondingly, the size of the lower communication hole 76 is also different. A large communication hole 76a having a large diameter is formed in the bottom wall of the large circular recess 74a, while a small circular recess 74b is formed. A small communicating hole 76b having a small diameter is formed in the bottom wall of the . In the present embodiment, the lower opening of the small communication hole 76b is provided with a counterbore 78 having an increased inner diameter and opening to the lower surface of the partition member main body 50. length dimension is adjusted.

On the other hand, as shown in FIGS. 8 and 9, the lid member 52 is formed with an upper communication hole 80 as a communication hole penetrating vertically at a position corresponding to the circular recess 74 in the partition member main body 50 . ing. In this embodiment, a plurality of upper communication holes 80 are formed corresponding to the plurality of circular recesses 74, and the plurality of upper communication holes 80 include those having different sizes. In particular, in the present embodiment, as the upper communication hole 80 in the lid member 52, a large communication hole 80a having a large diameter is formed at a position opposed to the large communication hole 76a in the large circular recess 74a in the vertical direction. A small communication hole 80b having a small diameter is formed in the small circular recess 74b at a position opposed to the small communication hole 76b in the vertical direction. The inner diameters of the large communicating hole 80a and the small communicating hole 80b are smaller than the inner diameters of the large circular recess 74a and the small circular recess 74b. It is made substantially equal to the inner diameter dimension of the hole 76b.

Each upper communication hole 80 of the lid member 52 is aligned with the upper opening of each circular recess 74 of the partition member main body 50 and superimposed thereon, so that a substantially cylindrical shape is formed inside the partition member 38 . A containment area 82 is formed. In this embodiment, a plurality of accommodation areas 82 are formed independently of each other, and communicate with one of the fluid chambers 44 and 46 through upper and lower communication holes 80 and 76, respectively. Particularly in this embodiment, the accommodation area 82 is configured to include a large accommodation area 82a and a small accommodation area 82b corresponding to the large circular recess 74a and the small circular recess 74b.

That is, the large accommodation area 82a and the small accommodation area 82b are respectively connected to the first fluid chamber through the upper communication holes 80 (large communication hole 80a and small communication hole 80b) formed in the lid member 52, which is the upper wall. 44, the second fluid chamber 46 is connected through a lower communication hole 76 (a large communication hole 76a and a small communication hole 76b) formed in the bottom wall of a circular recess 74, which is the lower wall. is connected to

Particularly in this embodiment, the upper communication hole 80 (large communication hole 80a and small communication hole 80b), the accommodation area 82 (large accommodation area 82a and small accommodation area 82b), and the lower communication hole 76 (large communication hole 76a and small communication A second orifice passage 84 communicating between the first fluid chamber 44 and the second fluid chamber 46 is formed by the hole 76b). Further, the second orifice passage 84 is designed so as to improve the anti-vibration performance against high-frequency, small-amplitude vibrations such as idling vibrations and running noises based on the flow action of the fluid through the second orifice passages 84. The length and cross-sectional area of the whole are tuned.

Here, a movable body 86 is housed in the housing area 82 above the second orifice passage 84 . As a result, the fluid pressure of the fluid enclosed in the first fluid chamber 44 is applied to the movable body 86 from above through the upper communicating hole 80 , while the pressure of the fluid enclosed in the first fluid chamber 44 is applied from below through the lower communicating hole 76 to the second fluid chamber 46 . The hydraulic pressure of the enclosed fluid is adapted to be exerted. In this embodiment, the movable body 86 has a solid spherical shape and is formed of an elastic body such as rubber or elastomer. In particular, in this embodiment, the movable body 86 has an outer peripheral surface shape of a substantially perfect sphere. In FIG. 3, the large circle line shown on the surface of each movable body 86 merely represents a parting line in terms of drawing or molding.

Moreover, in this embodiment, a plurality of movable bodies 86 are employed, and one movable body 86 is housed in each of the plurality of housing areas 82 . Particularly in this embodiment, the plurality of movable bodies 86 have different sizes. and a small movable body 86b. In this embodiment, the plurality of movable bodies 86 (the large movable body 86a and the small movable body 86b) are all made of the same elastic material.

Furthermore, the outer diameter dimension of the movable body 86 is smaller than the inner diameter dimension of the accommodation area 82 , and a gap 88 is set between the movable body 86 and the wall portion forming the accommodation area 82 . That is, the outer diameter dimension of the large movable body 86a and the small movable body 86b is made slightly smaller than the inner diameter dimension of the large circular recess 74a and the small circular recess 74b, so that the large and small housing regions 82a and 82b can be accommodated. In the state where the large movable body 86a and the small movable body 86b are positioned in the middle of the vertical movement stroke, the inner peripheral walls of the large housing area 82a and the small housing area 82b are formed around the large movable body 86a and the small movable body 86b. A gap 88 is set between the upper and lower wall portions (see the enlarged view in FIG. 1). Particularly in this embodiment, the large movable body 86a and the small movable body 86b are allowed to displace more in the axial direction than in the axis-perpendicular direction within the large accommodation area 82a and the small accommodation area 82b.

In the engine mount 10 of the present embodiment having the structure as described above, when low-frequency, large-amplitude vibration such as engine shake is input under the state of being mounted on the vehicle as described above, the first orifice A vibration damping effect accompanying the fluid flow through the passage 56 is exhibited. In this case, the movable body 86 (the large movable body 86a and the small movable body 86b) is displaced in the vertical direction in the second orifice passage 84, and the upper communicating hole 80 (the large communicating hole 80a and the small communicating hole 80a) in the partition member 38 is opened. 80b) or the lower communicating hole 76 (the large communicating hole 76a and the small communicating hole 76b). As a result, the fluid flow through the first orifice passage 56 is efficiently induced, and the amount of fluid flow is ensured, so that the vibration damping effect due to the fluid flow, such as the resonance action of the fluid, is effectively and stably exhibited. can be

At this time, in the present embodiment, since the movable body 86 has a substantially spherical outer peripheral surface shape, substantially circular upper communication holes 80 and lower communication holes 80 provided in both upper and lower walls of the housing area 82 are formed. The portion of contact with the hole 76 is an outer peripheral surface 90 having a spherical surface, and the movable body 86 is an annular ( approximately linear).

As a result, the area of contact with the partition member 38 can be reduced compared to the case where the movable body has a plate shape as in the prior art, and abnormal noise and vibration caused by impact can be effectively suppressed. obtain. In particular, if the movable body is deformed in contact with the partition member, the amount of fluid flowing through the first orifice passage 56 may decrease, leading to deterioration in vibration damping performance. For this reason, it has been difficult to achieve both the contradictory requirements of securing deformation rigidity and reducing contact hammering noise, etc., in the flat plate-like movable body (movable plate) of the conventional structure. Here, in the present invention, by adopting the three-dimensional (spherical in the embodiment) movable body 86, the amount of elastic deformation of the movable body 86 itself is suppressed, and the first orifice passage 56 satisfactorily secures the anti-vibration effect. At the same time, by reducing the contact area with the partition member 38, even if the movable body 86 is made of a material with low elasticity, the concentrated contact load causes effective elastic deformation at the striking portion, thereby providing a good cushioning effect. It becomes possible to obtain.

In this embodiment, the movable body 86 includes a large movable body 86a and a small movable body 86b. The contact area of the contact portion when contacting the large communicating hole 80a or the opening peripheral portion of the lower large communicating hole 76a), and the small movable body 86b contacting the partition member 38 (the upper small communicating hole 80b or the lower side The contact area of the contact portion when contacting with the opening peripheral portion of the small communication hole 76b can be made different from each other. As a result, it is possible to disperse the hammering sound and vibration when the movable body 86 comes into contact with the partition member 38, thereby reducing the noise and vibration.

On the other hand, when high-frequency, small-amplitude vibrations such as idling vibrations and running booming noises are input to the engine mount 10, the movable body 86 reciprocates vertically within the housing area 82 with an amplitude that does not hit it. Therefore, a low dynamic spring effect can be exhibited by a fluid flow action through the second orifice passage 84, a pressure absorption action accompanying vertical displacement of the movable body 86, and the like.

Although the embodiments of the present invention have been described above, the present invention is not to be construed as being limited by the specific descriptions in such embodiments, and various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art. It is possible to implement in a mode in which

For example, the number of movable bodies and accommodation areas is not limited at all. may be accommodated, or a mode in which only one accommodation area and one movable body are provided may be employed.

In the above-described embodiment, the plurality of movable bodies 86 are configured to include different sizes (the large movable body 86a and the small movable body 86b). The movable bodies may be of the same size.

Furthermore, in the above-described embodiment, the same material is used for all of the plurality of movable bodies 86, but when a plurality of movable bodies are provided, at least one movable body is made of an elastic body different in material from the others. may As a result, the mass and hardness of each movable body can be adjusted, and the force acting upon contact between the movable body and the partition member can be distributed differently. Tuning to broaden the frequency range of the vibration effect is also possible.

Furthermore, it is sufficient that at least the outer peripheral surface of the movable body, which is the contact portion, is made of an elastic material. good. Furthermore, when only a specific portion of the outer peripheral surface abuts against the opening peripheral portion of the communication hole, at least the specific abutting portion may be formed of an elastic body having a spherical surface, and other portions of the outer peripheral surface may be formed. may be formed of, for example, metal or synthetic resin, or may be an aspherical shape such as a flat surface. That is, the movable body may have at least a spherical surface at the abutting portion, and is not limited to a spherical surface as a whole as in the above embodiment or a true spherical surface. Of course, by making the outer peripheral surface spherical or nearly spherical, regardless of the direction of the movable body, that is, even if the movable body is rotated and displaced in any direction, it will be linear with respect to the opening peripheral portion of the communication hole. It becomes possible to stably secure the contact portion of the shape. As a result, it is possible to avoid repeated hits only at the specific portion, so that durability and the like can be improved. In this way, the number, size, shape, material, etc. of the movable bodies can be appropriately designed according to not only the magnitude of generated hammering and vibration, but also the required anti-vibration characteristics, and are not limited in any way. not something.

It should be noted that when the movable body is displaced, it is preferable that the movable body abuts against the peripheral edge of the opening of the communication hole without a gap, so that the vibration damping effect through the first orifice passage is more effectively exhibited. can be Of course, when the movable body and the peripheral edge of the opening of the communication hole abut against each other, there may be a slight gap between them. For example, on the surface of the movable body, by providing cushioning protrusions such as textures on the part that contacts the partition member, the presence or absence of gaps between the contact surfaces due to manufacturing dimensional errors and variations in the size of the gap can be suppressed. Also, it is possible to further reduce the contact impact, and setting the gap at the time of contact may be used for tuning the vibration damping characteristics.

Moreover, the plurality of accommodation areas in which the movable bodies are respectively accommodated do not need to be completely independent, and may be in communication with each other. That is, it suffices that the moving state of the movable body in each storage area (including the state of contact with openings on both sides of the storage area) is stable, and the fluid independence between a plurality of storage areas is achieved according to the present invention. not required in

The fluid-filled vibration damping device according to the present invention is not limited to the engine mount for automobiles as in the above embodiment, but is applied to vibration damping devices such as strut mounts, member mounts, and body mounts for automobiles. Alternatively, it may be applied to anti-vibration devices other than automobiles. The present invention can also be applied to a conventionally known cylindrical fluid-filled vibration damping device in which a fluid chamber is formed between an inner shaft member and an outer cylindrical member that are connected by a main rubber elastic body. The basic structure of the applied fluid-filled vibration isolator is not limited.
In addition, the present invention originally includes each of the inventions described in (i) to (v) below, and the configuration and effects thereof will be added.
The present invention
(i) In a fluid-filled vibration damping device having fluid chambers separated by a partition member, the partition member is formed with a storage area for displacing the movable body with a gap, and both sides of the storage area. The receiving area communicates with each one of the fluid chambers through communication holes that are opened facing the wall, and the contact portion of each of the movable bodies with the wall is a spherical elastic body. A fluid-filled anti-vibration device characterized by:
(ii) The fluid-filled vibration isolator according to claim 1, wherein a plurality of said housing areas containing said movable bodies are provided.
(iii) the fluid-filled vibration isolator according to claim 2, wherein the plurality of movable bodies include ones of different sizes;
(iv) the fluid-filled vibration isolator according to claim 2 or 3, wherein the plurality of movable bodies are made of different materials;
(v) the fluid-filled vibration isolator according to any one of claims 1 to 4, wherein the movable body is spherical;
including inventions related to
In the invention described in (i) above, when the movable body is displaced due to relative pressure fluctuations between the fluid chambers and comes into contact with the wall, the movable body is elastic with respect to the peripheral edge of the opening of the communication hole provided in the wall. Since the spherical surface of the movable body made of the body abuts with a substantially linear small area, compared to the case where the flat plate-shaped movable body abuts the partition member in a planar manner as in Patent Document 1, for example, The contact area can be reduced, and the impact sound and vibration when the movable body strikes the partition member can be reduced or prevented.
In the invention described in (ii) above, since the plurality of movable bodies abut on the partition member at a plurality of points, the amount of pressure fluctuation or the amount of fluid flow permitted by the displacement of the movable bodies is ensured in total. , the impact at the time of contact can be dispersed.
In the invention described in (iii) above, by making the sizes of the movable bodies different, it is possible to adjust the contact area between the movable body and the partition member, the magnitude of the force at the time of contact, and the like for each movable body. Therefore, it is possible to disperse the hammering sound and vibration (frequency etc.) at the time of contact .
In the invention described in (iv) above, by using different materials for the movable bodies, it is possible to adjust the magnitude of the contact force between the movable body and the partition member for each movable body. It is possible to disperse the hitting sound and vibration (frequency etc.) at the time.
In the invention described in (v) above, regardless of the directionality (state of rotational displacement) of the movable body, it is possible to bring the movable body into contact with the partition member in a desired substantially constant state.

10: Engine mount (fluid-filled vibration damping device), 38: Partition member, 44: First fluid chamber (fluid chamber), 46: Second fluid chamber (fluid chamber), 76: Lower communication hole (communication hole), 80: upper communication hole (communication hole), 82: accommodation area, 86: movable body, 88: gap, 90: outer peripheral surface (contact portion, spherical surface)

Claims (3)

In a fluid-filled vibration isolator having fluid chambers separated by partition members,
The partition member is formed with a storage area for displacing the movable body with a gap. communicated with a fluid chamber, and a contact portion of each one of the movable bodies with the wall portion is an elastic body having a spherical surface;
A plurality of accommodation areas are provided in which the movable bodies are accommodated,
A fluid-filled vibration isolator, wherein the plurality of movable bodies include ones of different sizes. In a fluid-filled vibration isolator having fluid chambers separated by partition members,
The partition member is formed with a storage area for displacing the movable body with a gap. communicated with a fluid chamber, and a contact portion of each one of the movable bodies with the wall portion is an elastic body having a spherical surface;
A plurality of accommodation areas are provided in which the movable bodies are accommodated,
A fluid-filled vibration isolator, wherein the plurality of movable bodies are made of different materials. 3. A fluid filled type vibration isolator according to claim 1, wherein said movable body is spherical.

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