JPH1122777A - Fluid sealed type vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a compact and simple structure by constituting a rotor by a part of a valve element, and arranging a coil capable of giving a rotating force to the rotor by current-carrying around the rotor. SOLUTION: An electric motor 98 as electromagnetic actuator for giving a rotating force to a rotating valve 80 is formed of a magnetized minor diameter part 86 in the rotating valve 80 and a coil 96 arranged around it. Since the rotor of the electric motor 98 is formed of a magnet part 86 formed by using a part of the rotating valve 80, a special rotor part is dispensed with, the number of part items and the number of assembling processes can be reduced, and simplification of the structure and reduction in size and cost of a mount can be advantageously attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled type vibration damping device in which a vibration damping effect is obtained by utilizing the flow action of an incompressible fluid flowing through a fluid flow path, and particularly to opening and closing the fluid flow path. The present invention relates to a fluid-filled type vibration damping device having a valve body for switching the vibration damping characteristics.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration isolating device such as a vibration isolating connection member and a vibration isolating support member interposed between members to be connected with vibration isolation, Japanese Unexamined Utility Model Publication No. Hei 5-40638 and Japanese Unexamined Patent Publication No. 9-2144.
No. 1, Japanese Unexamined Patent Application Publication No. 62-88833, Japanese Unexamined Patent Application Publication No.
As described in JP-A-264958, the first mounting member and the second mounting member are connected by a main rubber elastic body, and vibration between the first mounting member and the second mounting member. A fluid which is caused to flow through a fluid passage by forming a plurality of fluid chambers in which an incompressible fluid is sealed and a fluid pressure passage between the fluid chambers, wherein the fluid chambers communicate with each other through the fluid passage. In a fluid filled type vibration damping device that obtains a vibration damping effect based on a flow action such as a resonance action, a valve element that opens and closes a fluid passage by rotation about one axis, and a drive that applies a rotational driving force to the valve element There is known a device in which means are provided to switch the vibration isolation characteristics by rotating a valve body. Since such a fluid-filled type vibration damping device can switch the vibration damping characteristics according to the situation by an external control signal, for example,
Applied to automobile engine mounts, the valve body is switched between when the vehicle is stopped and when the vehicle is running, so that the anti-vibration effect against medium frequency vibrations such as idle vibration required when the vehicle is stopped and the shake required when the vehicle is running Thus, it is possible to easily achieve compatibility with a vibration-proofing effect against low-frequency vibrations such as low-frequency vibrations and high-frequency vibrations such as muffled sounds.

However, in a conventional fluid filled type vibration damping device provided with a switching valve element, a valve element disposed in a fluid storage area sealed with respect to an external space is generally connected to the outside of the fluid storage area. In this case, the drive means is configured to be operated by a drive means such as a motor provided in the apparatus, so that the drive means is likely to have a shape protruding outward, and there is a problem that it is difficult to avoid upsizing of the vibration isolator.

Further, since a transmission mechanism for transmitting the driving force of the driving means to the valve body is provided so as to extend over the inside and outside of the fluid storage area, a seal structure for ensuring fluid tightness is provided. However, this is liable to be complicated, which has caused an increase in the number of parts and an increase in cost.

[0005]

Here, the present invention has been made in view of the above-mentioned circumstances, and a problem to be solved is to provide a valve element for opening and closing a fluid passage, and a drive for driving the valve element. An object of the present invention is to realize a fluid-filled type vibration damping device having means with a compact and simple structure.

[0006]

In order to solve such a problem, the invention according to claim 1 is characterized in that a first mounting member and a second mounting member are connected by a rubber elastic body. A relative pressure difference is created by vibration input between the first and second mounting members,
A valve body that forms a plurality of fluid chambers in which an incompressible fluid is sealed, forms a fluid passage that interconnects the fluid chambers, and opens and closes the fluid passage by rotation about one axis; In the fluid filled type vibration damping device provided with a driving means for exerting a rotational driving force on the rotor, a part of the valve body constitutes a rotor, and a coil around the rotor capable of applying a rotating force to the rotor by energization. Is provided to constitute the driving means.

In the fluid filled type vibration damping device having the structure according to the first aspect of the present invention, the rotor is constituted by the valve itself by using a part of the valve as the rotor. The drive mechanism for opening and closing the valve element is formed with a small number of parts and an extremely simple and compact structure because the drive mechanism comprising an electric motor is constituted by the coils arranged around the drive mechanism. As a result, both the simplification and the compactness of the structure of the fluid-filled type vibration damping device can be advantageously achieved.

Further, since the driving means is made compact using a part of the valve element, the valve element and the driving means can be housed and arranged in the mount, and the compactness can be achieved more advantageously. In addition, by arranging the driving means in the fluid storage area, high fluid tightness can be easily realized.

The specific shape of the valve body is designed so that the fluid passage can be opened and closed by rotation around one axis according to the form of the fluid passage and the like, and is not limited. A rod-shaped valve body or the like in which a through hole or notch for communicating the fluid passage is formed in a direction perpendicular to the axis can be suitably used.

The driving means formed by the rotor and the coil of the valve body may be an electric motor capable of exerting a rotational force on the valve body to open and close the fluid passage by energizing the coil. Is not particularly limited. For example, a stopper mechanism that positions the valve body at the open position and the closed position is provided, and D
Although it is possible to constitute a C motor or the like, particularly preferably, a stepping motor is constituted by a rotor and a coil as described in claim 2. According to this configuration, the opening and closing operation of the valve body can be performed stably with high positioning accuracy, and the cross-sectional area of the fluid passage is changed by adjusting the opening degree of the valve body. As a result, a stepping motor capable of adjusting the vibration isolation performance in multiple stages can be easily and compactly realized with a simple structure.

Further, the rotor of the valve body may be any one that can receive a magnetic force or a rotational force based on an electromagnetic force by energizing the coil. For example, a ferromagnetic material such as iron is provided at least in the rotor part. , It is possible to constitute a rotor that receives a rotational force by energizing the coil, but it is particularly preferable that a part of the valve element be magnetized as described in claim 3. And the rotor is constituted by the magnet unit. According to the configuration of the third aspect, a large rotary driving force can be advantageously obtained by the small-sized rotor and the valve body. The magnetized form of the magnet part is set so as to be able to open and close the valve body according to the structure and shape of the coil, but is not limited thereto. A magnet portion extending upward is formed, and the magnetic poles are partially or alternately magnetized in the circumferential direction of the magnet portion. Further, when such a magnet portion is adopted, the coil disposed on the outer peripheral portion is constituted by substantially a plurality of coil portions disposed in the circumferential direction,
A stepper motor can be advantageously configured.

In the case where a part of the valve body is a magnet part, the material of the valve body is not particularly limited as long as at least a part forming the magnet part can be magnetized. Although it is possible to form the valve body with a material or the like, particularly preferably, as described in claim 4,
Such a valve body is made of synthetic resin, and the magnet part is formed by a plastic magnet. According to the above configuration, it is easy to manufacture the valve body, the cost is low, the weight can be advantageously reduced, and the sliding resistance at the time of opening and closing operation of the valve body is suppressed to be small. Can be

The positions of the valve element and the coil are appropriately set according to the specific structure and the like of the vibration isolator, and are not particularly limited. As described in claim 5, the valve element and the coil are:
Each of them is incorporated and disposed inside a passage forming member that forms a fluid passage. According to the configuration of the fifth aspect, the passage forming member can be used as a support member of the valve body, and the arrangement space for the valve body for opening and closing the fluid passage and the driving means therefor is efficiently secured. It can be done.

Further, the material of the passage forming member is not particularly limited, but preferably, the passage forming member is made of a synthetic resin as described in claim 6. The coil is integrally inserted into the passage forming member. According to the above configuration, the sealing property of the coil is advantageously ensured without using any special member, and the disposition of the driving means in the fluid storage area is simpler. In addition to being realized with a structure, a reduction in the number of parts and an improvement in coil assembling workability can be advantageously achieved.

[0015] Further, the present invention relates to a method disclosed in Japanese Unexamined Utility Model Publication No.
And Japanese Unexamined Patent Publication No. 9-21441, and Japanese Unexamined Patent Publication No. 62-8 / 1987.
For example, the invention can be applied to a fluid-filled type vibration damping device having a conventionally known various structure including a valve body for opening and closing a fluid passage disclosed in Japanese Patent Application Laid-Open No. 8833/1994 and Japanese Patent Application Laid-Open No. 6-264958. The configuration according to claim 7 can be advantageously employed. That is, according to a seventh aspect of the present invention, in the fluid-filled type vibration damping device according to any one of the first to sixth aspects, the second mounting member has a substantially cylindrical shape, and the first mounting member has a substantially cylindrical shape. The main body rubber, wherein a mounting member is disposed at a predetermined distance in an opening direction of the second mounting member, and the first mounting member is elastically connected to the second mounting member. The opening of the second mounting member is fluid-tightly closed by the elastic body, while the partition member is accommodated and fixed inside the second mounting member, and the partition member is sandwiched in the axial direction. On both sides, a pressure receiving chamber in which a part of a wall is formed of the main rubber elastic body and an equilibrium chamber in which a part of the wall is formed of a flexible film are formed. Wherein the valve element and the coil are incorporated and disposed. In the fluid filled type vibration damping device having the structure according to the seventh aspect of the present invention, the space for disposing the valve element and its driving means can be efficiently secured inside the partition member. It is also possible to form a fluid passage inside the partition member, whereby a further simplification of the structure can be achieved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, FIGS. 1 to 3 show an engine mount 10 for an automobile according to an embodiment of the present invention. The engine mount 10 has a structure in which a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member are elastically connected by a main rubber elastic body 16. The first mounting bracket 12
Are mounted on the power unit, and the second mounting brackets 14 are mounted on the body side, so that the power unit is supported on the body by vibration isolation. In such a mounted state, a power unit load is applied between the first mounting bracket 12 and the second mounting bracket 14 and the main rubber elastic body 16 is compressed and deformed. The first and second mounting brackets 14 are displaced by a predetermined amount in a direction in which the first and second mounting brackets 14 approach each other (vertical direction in FIG. 1 which is the mount axis direction), and the main vibration to be damped is determined by the first mounting brackets. The input is made in the approach / separation direction (mount axis direction) between the second mounting bracket 14 and the second mounting bracket 14. In the following description,
The terms “upper” and “lower” mean, in principle, the vertical direction in FIG.

More specifically, the first mounting member 12 has a substantially disk shape, and a circular rod-shaped holding metal member 18 is fixed to a central portion thereof so as to protrude downward in the axial direction. . Then, with respect to the lower end portion of the holding bracket 18,
An umbrella fitting 20 having a substantially hat shape and extending in a direction perpendicular to the axis is fixed by bolts. Further, a first mounting bolt 22 that penetrates through the first mounting bracket 12 and protrudes upward is integrally formed at an upper end portion of the holding bracket 18. The mounting bracket 12 is fixedly mounted on a power unit (not shown).

The second mounting member 14 includes an upper cylindrical metal member 24 and a middle cylindrical metal member 26 each having a large diameter and a substantially cylindrical shape.
Further, the lower bottom metal fittings 28 having a cylindrical shape with a bottom are stacked on each other in the axial direction and connected on the same axis, and have a substantially cylindrical shape with a bottom as a whole. Here, the upper cylindrical metal fitting 24 has a tapered portion 30 whose diameter increases upward at an axial upper end portion, and has a flange portion 32 that expands radially outward at an axial lower end portion. ing. The lower bottom fitting 28 has a flange portion 34 extending radially outward at the periphery of the opening, and a second mounting bolt protruding downward through the central portion on the bottom wall portion. The second mounting bolt 36 is fixed to the second mounting bracket 14.
Is fixedly attached to a body (not shown). Furthermore, the middle cylinder fitting 26 has caulking fixing parts 38 at both ends in the axial direction, and the upper cylinder fitting 24 and the lower bottom metal fitting 28 are fixed to each other by these caulking fixing parts 38. Connected to the second mounting bracket 1 having a deep bottomed cylindrical shape as a whole.
4 are formed.

A first mounting member 12 is disposed at a predetermined distance in the opening direction of the second mounting member 14, and a holding member 18 fixed to the first mounting member 12 is provided.
It is inserted in the axial direction from the opening of the second mounting member 14. Further, the main rubber elastic body 16 is interposed between the opposing surfaces of the first mounting member 12 and the second mounting member 14 which are arranged to face each other in the axial direction. This main body rubber elastic body 16
Has a substantially truncated conical shape as a whole, the lower surface of the first mounting member 12 on the small-diameter end surface, and the taper of the second mounting member 14 (upper cylindrical metal member 24) on the outer peripheral surface of the large-diameter end portion. The part 30 is
Each is vulcanized and adhered. The holding bracket 18 is
An umbrella fitting 20 which penetrates the center axis of the main rubber elastic body 16 and protrudes from the large-diameter end face and is supported by the holding fitting 18.
However, it is positioned so as to spread in the direction perpendicular to the axis within the upper cylindrical metal fitting 24.

Further, inside the second mounting bracket 14,
A partition member 40 having a circular block shape as a whole,
A diaphragm 42 as a flexible film made of a rubber elastic film having a thin disk shape is housed in a state of being overlapped with each other in the axial direction. Each of the partition member 40 and the diaphragm 42 has an outer peripheral edge portion formed by an upper cylindrical fitting 24 and a lower bottom fitting 28.
Is axially sandwiched between the two flange portions 32, 34 and axially sandwiched between the upper and lower caulking fixing portions 38, 38 of the middle cylindrical member 26, so that the second mounting member 14 is positioned at an intermediate portion in the axial direction. Then, it is fixedly attached to the second mounting bracket 14 in a state of spreading in the direction perpendicular to the axis. A ring fitting 44 is vulcanized and bonded to the outer peripheral edge of the diaphragm 42, so that the holding force of the second fitting 14 can be advantageously exerted.

As a result, inside the second mounting member 14, the space between the main rubber elastic body 16 and the diaphragm 42 is sealed with respect to the external space, and a predetermined incompressible fluid is sealed. Further, such a fluid-filled area is bisected by a partition member 40 at an intermediate portion in the axial direction,
Thus, above the partitioning member 40, a pressure receiving chamber 54 is formed in which a part of the wall is formed of the main body rubber elastic body 16 and a change in internal pressure is generated when vibration is input, while the partitioning member 4 is formed.
Below the zero, there is formed an equilibrium chamber 56 in which a part of the wall portion is constituted by the diaphragm 42 and a change in volume is easily allowed. The enclosed fluid is preferably a low-viscosity fluid such as water, an alkylene glycol, a polyalkylene glycol, or a silicone oil, particularly 0.1 Pa · s or less, so that the vibration damping effect based on the resonance action of the fluid is effectively exhibited. Those having a viscosity of are suitably employed. In short, in the present embodiment, two fluid chambers are constituted by the pressure receiving chamber 54 and the equilibrium chamber 56.

A stopper member 60 having a substantially cylindrical shape and integrally formed with a stopper portion 58 protruding radially inward at an upper end portion in the axial direction is provided inside the upper cylindrical member 24.
It is inserted along the inner peripheral surface and is housed and arranged inside the pressure receiving chamber 54. The stopper 58 is covered with the cushion rubber layer 62. This stopper fitting 60
The lower end portion in the axial direction is bent outward in the radial direction, and is fixedly clamped together with the diaphragm 42 by the second mounting member 14. The stopper portion 58 is connected to the first mounting member 1.
2 against the outer peripheral edge of the umbrella fitting 20 supported by
It is positioned facing upward in the axial direction. This allows
The amount of deformation of the main rubber elastic body 16 in the rebound direction in which the first fitting 12 and the second fitting 14 are relatively separated by the contact of the umbrella fitting 20 with the stopper portion 58 is limited. It is becoming.

When the power unit is loaded on the vehicle, the first mounting bracket 12 and the second mounting bracket 14 are relatively moved from the state shown in FIG. The umbrella fitting 20 is displaced and the stopper 5
8, the umbrella bracket 20 is positioned at a predetermined distance axially downward from the umbrella 8 when the vehicle stops or when the vehicle normally travels.
And the stopper 58 is prevented from interfering with each other. In such a mounted state, the umbrella fitting 2
0 and the inner peripheral surface of the cylindrical portion of the stopper fitting 60,
An annular stenosis flow path is formed, and at the time of vibration input, the umbrella fitting 20 is displaced in the pressure receiving chamber 54 to generate fluid flow through the stenosis flow path.
Based on such a fluid action such as a resonance action of the fluid, an anti-vibration effect against high-frequency vibration such as muffled sound is exerted.

Further, the partition member 40 includes a thick disk-shaped main body block 64 formed of a hard material such as resin or metal (in the present embodiment, synthetic resin).
The main body block 64 is formed with a circumferential groove 66 that is open on the upper surface and extends in an arc shape with a length of less than one circumference in the circumferential direction around the central axis, and a disk 68 is superimposed on the upper surface of the main body block 64. By covering the peripheral groove 66, a first fluid flow path 70 extending in an arc shape is formed. The first fluid flow path 70 has a disk 68 at one end.
Is connected to the pressure receiving chamber 54 through a through hole 72 formed at the other end, and the other end is connected to the balance chamber 56 through a through hole 74 formed through the main body block 64. The fluid flow through the first fluid passage 70 is generated between the pressure receiving chamber 54 and the balance chamber 56 based on the pressure difference between the two chambers.
In particular, in the present embodiment, the first fluid flow path 70 is appropriately set in consideration of the wall spring stiffness and the like of the pressure receiving chamber 54 and the equilibrium chamber 56 by the flow path length and the cross-sectional area of the first fluid flow path 70. The tuning is performed based on the resonance action of the fluid that is caused to flow through the fluid flow path 70 so that an effective damping effect is exerted on low-frequency vibration such as shake.

A second fluid flow path 76 is formed in the center of the partitioning member 40 so as to extend through the main body block 64 and the disk 68 and extend linearly in the axial direction with a substantially rectangular cross section. At the time of vibration input, fluid flow between the pressure receiving chamber 54 and the equilibrium chamber 56 is caused to flow through the second fluid flow path 76 between the two chambers 54 and 56 based on the internal pressure difference. And especially in this embodiment,
The passage length and the cross-sectional area of the second fluid passage 76 are determined by the pressure receiving chamber 54.
And the wall spring stiffness of the equilibrium chamber 56, etc., are set appropriately, so that the second fluid flow path 76 is subjected to medium-frequency vibrations such as idle vibrations based on the resonance action of the fluid flowing therethrough. Tuned for effective damping.

Here, in the main body block 64 of the partition member 40, a valve mounting hole 78 having a circular cross section, which extends in a radial direction passing through the central axis at a central portion in the axial direction and has one end opened on the outer peripheral surface. The valve mounting hole 78 is formed so as to be orthogonal to the second fluid flow path 76 with an inner diameter larger than the width of the second fluid flow path 76. A rotary valve 80 as a valve having a substantially circular rod shape as a whole is inserted into the valve mounting hole 78, fitted and mounted, and a circular block is inserted into an opening of the valve mounting hole 78. The opening of the valve mounting hole 78 is fluid-tightly closed by fitting the shaped plug 82 and fixing it by welding if necessary.

The rotary valve 80 is provided with the valve mounting hole 7.
8 has a stepped circular rod shape consisting of a large-diameter portion 84 and a small-diameter portion 86, and a pair of support pins 88, 90 projecting on the central axis at both axial ends. Is erected. Then, these support pins 88, 90
Are inserted into and supported by valve support holes 92 and 94 formed in the bottom of the valve mounting hole 78 and the inner surface of the plug 82, respectively, so that the rotary valve 80 is rotatably arranged around its central axis. Has been established. Also, the rotary valve 80
Under the mounting state of, the large diameter portion 84 is disposed at a position where the second fluid flow path 76 is shut off.
A communication hole 95 extending through in a direction perpendicular to the axis is formed to have substantially the same cross-sectional shape as the second fluid flow path 76, and as shown in FIG. When the opening of the second fluid flow path 76 is aligned with the second fluid flow path 76,
Is to be communicated.

In short, by rotating the rotary valve 80 around the central axis, the second fluid flow path 76 is
3 and the communication state shown in FIG. 4 can be selectively switched. In a state where the second fluid flow path 76 is blocked, the pressure receiving chamber 54 and the equilibrium
Is generated exclusively through the first fluid flow path 70, the vibration damping effect against low-frequency vibration is reduced based on the flow action of the fluid caused to flow through the first fluid flow path 70. On the other hand, under the state where the second fluid flow path 76 is communicated, the second fluid flow path 76 has a channel cross-sectional area larger than that of the first fluid flow path 70:
Since the ratio of A to the flow path length: L: the value of A / L is increased and the flow resistance is reduced, the fluid flow between the pressure receiving chamber 54 and the equilibrium chamber 56 during vibration input is substantially reduced. Is generated through the second fluid flow path 76, whereby the vibration damping effect against the medium frequency vibration is effectively exhibited based on the flow action of the fluid caused to flow through the second fluid flow path 76. Because

Further, the rotary valve 80 is made of a material that can be magnetized at least at the portion of the small diameter portion 86, and the small diameter portion 86 forms a magnet portion. In addition, the small diameter portion 8
6 is not particularly limited as long as the material has predetermined rigidity and durability and smooth rotation of the rotary valve 80 in the valve mounting hole 78 can be realized. , Metal etc. can be adopted,
Preferably, a synthetic resin is employed, and the small diameter portion 86 is formed of a plastic magnet. Known plastic magnets can be used, and are formed by dispersing a magnetic material in a synthetic resin material. In addition, as the synthetic resin material, a material that is excellent in durability against a sealed fluid, has a small swelling property, and is easily molded is preferable.
For example, PPS (polyphenylene sulfide) or the like is suitably used.

On the other hand, the main body block 64 has a valve mounting hole 7 in which the small diameter portion 86 of the rotary valve 80 is inserted.
A coil 96 is positioned substantially coaxially with the valve mounting hole 78 so as to surround the periphery of the tip (bottom side) of the coil 8, and is embedded in the main body block 64 in a buried state. In particular, in the present embodiment, since the main body block 64 made of synthetic resin is employed, for example,
By filling the resin material with the coil 96 set in the molding cavity of the mold and molding the main body block 64, the coil 96 is integrally insert-molded in the main body block 64.

An electric motor 98 as an electromagnetic actuator that exerts a rotational driving force on the rotary valve 80 by a magnetized small diameter portion 86 of the rotary valve 80 and a coil 96 disposed around the small diameter portion 86. Is configured. In the drawing, reference numeral 100 denotes a lead wire for supplying power to the electric motor 98.

Here, the electric motor 98 controls the rotation of the rotary valve 80 based on the control of the energization state of the coil 96 by appropriately setting the form of the magnetic pole in the small diameter portion 86 and the winding structure of the coil 96. The position can be switched to position. Specifically, for example,
The rotor is formed by setting magnetic poles at appropriate intervals in the circumferential direction of the small-diameter portion 86, and a plurality of substantially divided coil portions that can be controlled to be energized are provided in the circumferential direction, so that the PM type stepping is performed.・ The motor is configured.

Therefore, in the engine mount 10 having the above-described structure, depending on the running state of the vehicle and the like,
By controlling the energization of the coil 96, the rotation position of the rotary valve 80 is switched, and the second fluid flow path 76
Is controlled to switch between the open state and the closed state,
Thus, the anti-vibration effect against low-frequency vibration by the first fluid flow path 70 and the anti-vibration effect effective against medium-frequency vibration by the second fluid flow path 76 are selectively exhibited. That would be.

In this case, the rotor of the electric motor 98 exerting a rotational driving force on the rotary valve 80 is connected to the rotary valve 80.
, A special rotor member is not required, and the number of parts and the number of assembly steps are reduced.
Simplification of the structure, downsizing of the mount, and cost reduction are advantageously achieved.

In addition to the fact that the rotor constituting the electric motor 98 is constituted by a magnet portion (small diameter portion) 86 formed by utilizing a part of the rotary valve 80,
The coil 96 that forms the electric motor 98 is
, The driving means of the rotary valve 80 is extremely compactly assembled and mounted on the mount 1.
In this case, the mount 10 can be integrated into the mount 10 so that the mount 10 can be made more compact.

In addition, in this embodiment, the coil 96 is
Since the partition member 40 is insert-molded at the time of molding, the number of parts is reduced, the assembling is facilitated, and the structure of the mount 10 itself can be advantageously simplified.

In this embodiment, the rotary valve 80 is made of a synthetic resin, and the magnet portion (small diameter portion) 86 is formed of a plastic magnet. Can be easily formed in any shape, and various effects such as prevention of defects such as chipping, weight reduction, and smooth switching of the valve body switching operation can be effectively achieved. .

As described above, one embodiment of the present invention has been described in detail. However, this is a literal example.
It should not be construed that the invention is limited only to such an embodiment.

For example, a VR type (variable reluctance type) stepping motor is constituted by forming at least the small diameter portion 86 of the rotary valve 80 from a ferromagnetic material such as iron and employing a non-magnetized rotor. It is also possible.

As shown in FIG. 5, a third fluid flow path 110 extending in a direction orthogonal to the second fluid flow path 76 is formed in the partition member 40, and these second fluid flow paths 110 are formed. By disposing the rotary valve 80 at the intersection of the fluid flow channel 76 and the third fluid flow channel 110, the second fluid flow channel 76 and the third fluid flow channel 110 Can be selectively and interlockedly opened and closed so that the second fluid flow path 76 and the third fluid flow path 110 are alternatively communicated. In FIG. 5, in order to facilitate the understanding, members and portions having the same structure as the engine mount 10 according to the embodiment are respectively shown in the drawing in the same manner as in the embodiment. The code is attached.

Further, by controlling the rotation angle of the rotary valve 80 to be small and adjusting the opening area of the communication hole 95 of the rotary valve 80 at the connection portion to the second fluid flow path 76, the second fluid is controlled. It is also possible to change and set the vibration damping effect exerted by the flow action of the fluid that is caused to flow through the flow path 76.

In the above embodiment, a specific example of the engine mount having two fluid flow paths has been described. However, the present invention is also applicable to an engine mount having one or three or more fluid flow paths. The same can be applied.

Further, the fluid chambers communicated with each other by the fluid flow path only need to generate a relative internal pressure difference. For example, a pair of fluid chambers in which positive and negative internal pressure fluctuations are generated. The present invention can be similarly applied to a fluid-filled type vibration isolator provided with the pressure receiving chamber described above.

In addition, in the above-described embodiment, a specific example in which the present invention is applied to an engine mount for a vehicle has been described. However, the present invention is also applicable to a body mount, a differential mount, a suspension bush, or the like for a vehicle. Any of various anti-vibration devices used other than the above can be applied.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0047]

As is apparent from the above description, in the fluid filled type vibration damping device having the structure according to the present invention, the drive means for operating the valve element is formed by utilizing a part of the valve element. Special rotor member is not required, the number of parts and the number of assembling steps are reduced, the structure is simplified, and the vibration isolator is reduced. Is advantageously achieved, and there is no need to attach a separate driving means to the outside, and it is easy to integrate the driving means integrally into the apparatus, further reducing the size. It can be easily realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an automobile engine mount as one embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view corresponding to a II-II section in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view corresponding to FIG. 3, showing another operation state of the rotary valve 80 in the engine mount shown in FIG. 1;

FIG. 5 is a cross-sectional view corresponding to FIG. 4, showing a main part of an engine mount as another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 engine mount 12 first mounting bracket 14 second mounting bracket 16 main rubber elastic body 40 partition member 42 diaphragm 54 pressure receiving chamber 56 equilibrium chamber 70 first fluid flow path 76 second fluid flow path 80 rotary valve 84 large Diameter part 86 Small diameter part 96 Coil 98 Electric motor 110 Third fluid flow path

Claims (7)

[Claims] The first mounting member and the second mounting member are connected by a rubber elastic body, while a relative pressure difference is generated by vibration input between the first mounting member and the second mounting member. A plurality of fluid chambers in which an incompressible fluid is sealed, a fluid passage connecting the fluid chambers to each other, and a valve body that opens and closes the fluid passage by rotation about one axis. And a fluid-filled type vibration damping device provided with a driving means for applying a rotational driving force to the valve body, wherein a rotor is constituted by a part of the valve body, and the rotor is rotated around the rotor by energization. A fluid-filled type vibration damping device, wherein the driving means is constituted by disposing a coil capable of exerting a force. 2. The fluid filled type vibration damping device according to claim 1, wherein a stepping motor is constituted by the rotor and the coil. 3. The fluid filled type vibration damping device according to claim 1, wherein a part of the valve body is a magnetized magnet part, and the magnet part constitutes the rotor. 4. The fluid filled type vibration damping device according to claim 3, wherein the valve body is made of a synthetic resin, and the magnet portion is formed of a plastic magnet. 5. The fluid-filled type according to claim 1, wherein the valve element and the coil are both incorporated and disposed inside a passage forming member that forms the fluid passage. Anti-vibration device. 6. The passage forming member is made of a synthetic resin,
The fluid filled type vibration damping device according to claim 5, wherein the coil is integrally inserted into the passage forming member. 7. The device according to claim 1, wherein the second mounting member has a substantially cylindrical shape, and the first mounting member is arranged at a predetermined distance in an opening direction of the second mounting member. The opening of the second mounting member is fluid-tightly closed by the main rubber elastic body elastically connecting the first mounting member to the second mounting member, while the first mounting member is fluid-tightly closed. A partition member is accommodated and fixed inside the second mounting member, and on both sides of the partition member in the axial direction, a pressure receiving chamber in which a part of the wall is formed of the main rubber elastic body, 7. The balance chamber according to claim 1, wherein an equilibrium chamber partially constituted by a flexible membrane is formed, and the valve element and the coil are incorporated and disposed inside the partition member. The fluid filled type vibration damping device according to the above.