JP2023161998A - Vibration isolator - Google Patents

Abstract

To provide a vibration isolator which can be sufficiently changed in stiffness by a simple constitution while using a magnetic fluid.SOLUTION: A vibration isolator 100 of the present invention includes an inside attachment member 1, a cylindrical outside attachment member 2, an elastic body 3 arranged between the inside attachment member 1 and the outside attachment member 2, and a liquid chamber 4 using the elastic body 3 as at least a part of a chamber wall. In the vibration isolator 100, a portion 23 protruding toward the liquid chamber 4 in a radial direction is formed at the outside attachment member 2, a magnetic fluid MF is sealed into the liquid chamber 4, and at least a part of the protrusion 23 of the outside attachment member 2 in a circumferential direction is constituted of at least a part of electromagnets 24 including a yoke 241 and an electromagnetic coil 242 which is wound around the yoke 241. The electromagnets 24 are arranged in a plurality of pieces in the circumferential direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vibration isolator.

2. Description of the Related Art Vibration isolators have been known as variable-rigidity vibration isolators that can change rigidity and damping characteristics as desired, in which a magnetic fluid is sealed in a liquid chamber facing an elastic body. For example, Patent Document 1 discloses that a partition wall that separates a liquid chamber filled with magnetic fluid into a first liquid chamber and a second liquid chamber includes a circumferential passage that communicates both liquid chambers, a yoke, and a coil. A vibration isolating device is disclosed which is provided with an electromagnet and can change the viscosity of a magnetic fluid and change the rigidity by passing a current through the coil.

JP2020-139547A

However, in the above-mentioned prior art, the structure of the vibration isolator becomes complicated because a circumferential passage and one electromagnet consisting of a yoke and a coil are formed in the partition wall that divides the liquid chamber into two. Furthermore, if the number of electromagnets (coils) is increased with the aim of achieving a more sufficient change in rigidity, the structure of the device becomes even more complicated, resulting in problems such as an increase in space and an increase in cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration isolator that can sufficiently change the rigidity with a simple configuration while using a magnetic fluid.

The vibration isolator of the present invention includes:
an inner mounting member, a cylindrical outer mounting member, an elastic body disposed between the inner mounting member and the outer mounting member, and a liquid chamber in which the elastic body forms at least a part of a chamber wall. A vibration isolator comprising:
The outer mounting member is formed with a convex portion that projects in a radial direction toward the liquid chamber,
A magnetic fluid is sealed in the liquid chamber,
At least a portion in the circumferential direction of the convex portion of the outer mounting member is constituted by at least a portion of an electromagnet including a yoke and an electromagnetic coil wound around the yoke,
A plurality of electromagnets are provided in the circumferential direction.
According to the vibration isolator of the present invention, the rigidity can be sufficiently changed with a simple configuration while using a magnetic fluid.

In the vibration isolator of the present invention,
Each of the plurality of electromagnets includes two radial yoke portions each forming the convex portion and extending in the radial direction, a circumferential yoke portion connecting the two radial yoke portions and extending in the circumferential direction, and The electromagnetic coil may be wound around the circumferential yoke portion.
In this case, the structure of the vibration isolator becomes simpler.

In the vibration isolator of the present invention,
The yoke includes a plurality of radial yoke parts each forming the convex part and extending in the radial direction, and a circumferential yoke part connecting the plurality of radial yoke parts and extending over the entire circumferential direction. ,
Each of the plurality of electromagnets may include one radial yoke part of the plurality of radial yoke parts, and an electromagnetic coil wound around the one radial yoke part. .
In this case, it becomes easier to change the rigidity of the vibration isolator more greatly.

In the vibration isolator of the present invention,
The outer mounting member has a built-in load sensor that detects an input load to the vibration isolator and a controller,
It is preferable that the controller controls a current value flowing through the electromagnetic coil based on the load detected by the load sensor.
In this case, the rigidity of the vibration isolator can be controlled with a simple system configuration.

In the vibration isolator of the present invention,
The outer mounting member has an actuator section including the electromagnet, and a member mounting section attached to the vibration generating section or the vibration receiving section,
It is preferable that the actuator section and the member attachment section are connected via the load sensor and an elastic body.
In this case, failure of the load sensor can be suppressed.

According to the present invention, it is possible to provide a vibration isolator that can sufficiently change the rigidity with a simple configuration while using a magnetic fluid.

FIG. 4 is a sectional view showing the vibration isolator according to the first embodiment of the present invention in a cross section taken along line YY in FIG. 3, which includes the axis of the vibration isolator. FIG. 2(a) is a half sectional view similar to FIG. 1 for explaining deformation of the vibration isolator in FIG. 1 during operation; FIG. FIG. 2B is a diagram showing the state immediately after the damper rod has been relatively displaced upward. FIG. 2 is a partial sectional view showing the vibration isolator of FIG. 1 in a cross section taken along line XX in FIG. 1; 4 is an enlarged view of part A in FIG. 3 for explaining a magnetic circuit formed in the vibration isolator of FIG. 1. FIG. FIG. 7 is a half sectional view showing a vibration isolator according to a second embodiment of the present invention in a cross section taken along the ZZ line in FIG. 6, which includes the axis of the vibration isolator. FIG. 6 is a partial sectional view showing the vibration isolator of FIG. 5 in a section similar to that of FIG. 1; FIG. 7 is a half sectional view showing a vibration isolator according to a third embodiment of the present invention in a cross section taken along the ZZ line in FIG. 6, which includes the axis of the vibration isolator. 8 is an explanatory diagram for explaining the overall configuration of a vibration isolating system including the vibration isolating device of FIG. 7. FIG. 8 is an equivalent model diagram for explaining the vibration isolation form of the vibration isolator of FIG. 7. FIG.

Hereinafter, vibration isolating devices according to some embodiments of the present invention will be exemplified with reference to the drawings.
Common members and parts in each figure are designated by the same reference numerals.
In this specification, the "axial direction" refers to a direction parallel to the axis O of the vibration isolator, and is indicated by the symbol "AD" in some drawings, and the "circumferential direction" refers to the direction parallel to the axis O of the vibration isolator. , and is indicated by the symbol "CD" in some drawings, and the "radial direction" refers to the direction perpendicular to the axis O of the vibration isolator, and is indicated by the symbol "RD" in some drawings. . Further, "radially inner" refers to a side closer to the axis O in the radial direction, and "radially outer" refers to a side farther from the axis O in the radial direction. Furthermore, "upper" or "lower" refers to the side that becomes the "upper side" or the "lower side" when the vibration isolator is mounted on, for example, a vehicle. In addition, in this specification, the term "yoke" collectively refers to the iron core part around which the electromagnetic coil is wound, and the yoke part that transmits the magnetic flux generated in the iron core part to other parts. .
Although the vibration isolator 100 of the embodiment described below is configured as a strut mount, it may be configured as any type of vibration isolator.

(First embodiment)
1 to 4 are drawings for explaining a vibration isolator 100 according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a vibration isolator according to a first embodiment of the present invention taken along line YY in FIG. 3, which includes the axis of the vibration isolator. FIG. 2 is a half sectional view similar to FIG. 1 to explain the deformation of the vibration isolator in FIG. 1 during operation, and FIG. FIG. 2B is a diagram showing a state immediately after the damper rod has been relatively displaced upward. FIG. 3 is a partial cross-sectional view of the vibration isolator shown in FIG. 1 taken along the line XX in FIG. FIG. 4 is an enlarged view of section A in FIG. 3 for explaining the magnetic circuit formed in the vibration isolator of FIG. 1. FIG.

The vibration isolator 100 according to the first embodiment of the present invention is configured as a strut mount placed above a damper such as a shock absorber of a vehicle.
As shown in FIGS. 1 and 3, the vibration isolator 100 according to the first embodiment of the present invention includes an inner mounting member 1, a cylindrical outer mounting member 2, an inner mounting member 1, and an outer mounting member 2. The liquid chamber 4 includes a rubber main body (elastic body) 3 disposed between the two, and a liquid chamber 4 having the rubber main body 3 as a part of the chamber wall.
In this embodiment, as shown in FIG. 1, in the vibration isolator 100 as a strut mount, a shock absorber consisting of a damper rod 51 and a cylinder (not shown), and a bump cap 52 are provided at the lower part of the inner mounting member 1. A coil spring 53 is attached to the lower part of the outer mounting member 2, and the vibration isolator 100 as a strut mount, the shock absorber, the bump cap 52, and the coil spring 53 collectively form the suspension of the vehicle. The device is configured. However, the vibration isolator 100 may be configured as, for example, a cab mount attached to the cabin of a vehicle or any other type of vibration isolator, and in those cases, the vibration isolator 100 may be configured as It does not have to be configured as part of a suspension device such as.

As shown in FIG. 1, in this embodiment, the inner mounting member 1 is configured to be attached to a member (damper rod 51 in this example) that becomes either a vibration generator or a vibration receiver. There is.
In this embodiment, more specifically, the inner mounting member 1 includes a bottom portion 1a extending in the radial direction, a side portion 1b extending axially upward from the bottom portion 1a, and a radial direction extending from the upper end of the side portion 1b. The damper rod 51 has a top portion 1c extending outward, and is configured such that the upper end portion of the damper rod 51 is fitted into a recessed portion formed by the bottom portion 1a and the side portions 1b, and is fitted with a bolt B1 or the like. The top portion 1c functions as a stopper when the vibration isolating device 100 rebounds (the state shown in FIG. 2(a), which will be described later).
In the present embodiment, the axially lower portion of the top portion 1c of the inner mounting member 1 includes the inner mounting member 1 and the outer An upper stopper rubber 11, which functions as a rebound stopper rubber that softens the impact caused by contact with the mounting member 2, is fixed by means such as vulcanization and/or adhesion. In this example, the upper stopper rubber 11 is continuous from and integrated with the main body rubber 3, which will be described later. However, the upper stopper rubber 11 may be configured separately from the main rubber 3.

In this embodiment, the inner mounting member 1 is a mounting fitting and is made of metal. More specifically, the inner mounting member 1 is preferably made of a magnetic material, that is, a metal with high magnetic permeability, so that an appropriate magnetic circuit is formed with an electromagnet 24, which will be described later. Specifically, it is preferable that the entire structure be made of or contain a metal exhibiting ferromagnetism (ferromagnetic material) such as iron and/or cobalt. In this embodiment, the inner mounting member 1 is made of iron.

As shown in FIGS. 1 and 3, in this embodiment, the outer mounting member 2 is a cylindrical (annular) member, and is attached to a member that becomes the other of the vibration generating part and the vibration receiving part (for example, , the body of a vehicle (not shown), and is configured to support the member. The central axis of the cylindrical outer mounting member 2 becomes the axis O of the vibration isolator 100.
In this embodiment, more specifically, the outer mounting member 2 includes an outer mounting member main body 20 and an electromagnet 24. The outer mounting member main body portion 20 may be made of a non-magnetic material, that is, a metal or resin having a lower magnetic permeability than the metal forming the inner mounting member 1 described above and the metal forming the yoke 241 described later. Preferably, more specifically, it is preferably made of aluminum and/or a hard resin having a certain strength. In this embodiment, the outer mounting member main body portion 20 is made of aluminum.
In the present embodiment, the axially lower portion of the outer mounting member 2 (more specifically, the outer mounting member main body portion 20) is provided at the bottom of the outer mounting member 2 (more specifically, the outer mounting member main body portion 20) when the vibration isolator 100 is bound (the state of FIG. 2(b) described later). The lower stopper rubber 21, which functions as a bound stopper rubber that softens the impact caused by the contact between the outer mounting member 2 and the lower member (more specifically, the bump cap 52 in this example), is vulcanized and/or Or it is fixed by adhesive or other means.
A more specific configuration of the electromagnet 24 and the outer mounting member will be described in detail later.

As shown in FIGS. 1 to 2(a) and (b), in this embodiment, the top part 1c of the inner mounting member 1, the upper stopper rubber 11 fixed to the lower part of the top part 1c, and the outer mounting member The lower stopper rubber 21 fixed to the lower part of the member 2 and the outer mounting member 2 serves as a stopper when the damper rod 51 (and by extension, the inner mounting member 1) is relatively displaced up and down in the axial direction.

As shown in FIGS. 1 and 3, in this embodiment, a main body rubber 3 as an elastic body is disposed between the inner attachment member 1 and the outer attachment member 2. The main body rubber 3 is attached to the inner mounting member 1 (more specifically, the side portion 1b of the inner mounting member 1) and the outer mounting member 2 (more specifically, the radially inner edge of the outer mounting member main body portion 20). and are fixed to each other by means such as vulcanization and/or adhesion. Note that the main body rubber 3 may be fixed to each of the inner mounting member 1 and the outer mounting member 2 via, for example, a mounting plate 32 as shown in FIG. 7.

In this embodiment, the main body rubber 3 has two peaks, a peak 33a located on the upper side in the axial direction and a peak 33b located on the lower side in the axial direction, as shown in FIG. . In the example shown in the figure, the main body rubber 3 is integrally formed as a whole by connecting two mountain parts 33a and 33b with thin rubber (rubber having a thin radial thickness). , has a recess 31 formed between the two peaks 33a and 33b inside the main body rubber 3 itself. However, in the main body rubber 3, the two peaks 33a and 33b may not be connected to each other by a thin rubber, but the two peaks 33a and 33b may be separated from each other and formed separately. However, when there is a radial input to the vibration isolator 100, the main body rubber 3 is connected to the convex portion 23 of the outer mounting member 2 and the inner mounting member 1 (more specifically, the side portion of the inner mounting member 1, which will be described later). 1b), it is preferable that the two peaks 33a and 33b are connected to each other by the thin rubber described above.

As shown in FIGS. 1 and 3, in this embodiment, the liquid chamber 4 has a main body rubber 3 (elastic body) as at least a part of the chamber wall. More specifically, in the illustrated example, the liquid chamber 4 has the main body rubber 3 and the outer mounting member 2 as chamber walls, and more specifically, the liquid chamber 4 has two peaks 33a of the main body rubber 3. and 33b, and the outer mounting member 2. However, the structure of the liquid chamber 4 is not particularly limited as long as the main body rubber 3 forms at least a part of the chamber wall. For example, the main body rubber 3, the outer mounting member 2, and the inner mounting member 1 may form the chamber wall. .
As shown in FIG. 1, in this embodiment, as will be described later, the outer mounting member 2 is provided with a convex portion 23, so that the liquid chamber 4 is adjacent to the convex portion 23 in the radial direction. The liquid chamber upper part 4a and the liquid chamber lower part 4b are configured to be able to communicate with each other through a gap 4c formed between the chamber walls.

Referring to FIG. 3, in this embodiment, the liquid chamber 4 exists continuously over the entire circumferential direction. Although the radially outer edge 4eo of the liquid chamber 4 is shown in FIG. This means that the liquid chamber 4 is continuous from the outer edge of the rubber 3 in the radial direction.

As shown in FIGS. 1 and 3, in this embodiment, the outer mounting member 2 is formed with a convex portion 23 that projects in the radial direction toward the liquid chamber 4. As shown in FIGS. That is, the outer mounting member 2 has a convex portion 23 . More specifically, in this embodiment, the convex portion 23 of the outer mounting member 2 is located between the peaks 33a and 33b on both the upper and lower sides of the rubber body 3 in the axial direction, and furthermore, in the illustrated example, the convex portion 23 of the outer attachment member 2 As described above, the convex portion 23 and the chamber wall of the liquid chamber 4 radially adjacent to the convex portion 23 (in this example, more specifically, A gap portion 4c having a relatively narrow radial width in the liquid chamber 4 is formed between the liquid chamber 4 and the thin portion of the main body rubber 3.

Referring to FIG. 3, in this embodiment, the convex portion 23 of the outer attachment member 2 extends continuously over the entire circumferential direction. However, the convex portion 23 of the outer mounting member 2 does not need to extend continuously over the entire circumferential direction. Only the radial yoke portion 241r) may be used as the convex portion 23 of the outer attachment member 2, and the convex portion 23 may be provided intermittently in the circumferential direction. However, from the viewpoint of changing the rigidity of the vibration isolator 100 more effectively using the magnetic fluid MF, which will be described later, as in this embodiment, the convex portion 23 of the outer mounting member 2 is formed continuously over the entire circumferential direction. Preferably, it extends.

The liquid chamber 4 is filled with a magnetic fluid MF.
The magnetic fluid MF is a fluid whose viscosity increases when placed in a magnetic field, and whose viscosity changes depending on the applied magnetic field. In this embodiment, since the magnetic fluid MF is sealed in the liquid chamber 4, the viscosity of the magnetic fluid MF in the liquid chamber 4 can be adjusted by appropriately controlling the magnetic field (magnetic flux density) applied to the magnetic fluid MF. By changing the stiffness of the vibration isolator 100, the damping force can be changed and controlled.
Examples of the magnetic fluid MF include MR fluids in which iron particles with an average particle diameter of 0.5 μm or more, preferably 1.0 μm or more are dispersed in a liquid such as ethylene glycol or polyα-olefin at a high concentration. Can be mentioned.

As shown in FIGS. 1 and 3, in this embodiment, at least a portion in the circumferential direction of the convex portion 23 of the outer mounting member 2 is connected to an electromagnet 24 including a yoke 241 and an electromagnetic coil 242 wound around the yoke 241. consists of at least a portion of
That is, referring to FIG. 3, in this embodiment, the convex portion 23 of the outer mounting member 2 (the portion of the outer mounting member 2 that is radially inner than the radially outer edge 4eo of the liquid chamber 4 in FIG. 3) At least a portion (a portion in this example) in the circumferential direction is provided by a yoke 241 (more specifically, a radial yoke portion 241r described later) which is at least a portion (a portion in this example) of the electromagnet 24. It is configured. More specifically, as shown in FIG. 3, in this example, the convex portion 23 is formed by connecting, in the circumferential direction, the 12 radial yoke portions 241r and the outer attachment member main body portion 20 interposed therebetween. , is composed of.
As described above, for example, in the circumferential direction, only the yoke 241 (more specifically, the radial yoke portion 241r) of the electromagnet 24 (described later) is used as the convex portion 23 of the outer mounting member 2, and the convex portion 23 is When provided intermittently in the circumferential direction, the entire convex portion 23 of the outer mounting member 2 in the circumferential direction is constituted by at least a portion of the electromagnet 24.

Here, in this specification, the term "electromagnet" includes a yoke and an electromagnetic coil wound around the yoke.
As shown in FIGS. 1 and 3, in this embodiment, the electromagnet 24 includes a yoke 241 and an electromagnetic coil 242 wound around the yoke 241.
In this embodiment, a plurality of electromagnets 24 are provided in the circumferential direction. More specifically, in the example of FIG. 3, the electromagnets 24 are provided on the outer mounting member 2, and six electromagnets 24 are provided along the circumferential direction at equal intervals. However, the number of electromagnets 24 is not particularly limited as long as it is plural, and may be 2 to 5 or 7 or more in the circumferential direction. However, from the viewpoint of changing the rigidity of the vibration isolator 100 more effectively using the magnetic fluid MF, it is preferable that six or more electromagnets 24 are provided in the circumferential direction, and 6 to 10 electromagnets 24 are preferably provided in the circumferential direction. More preferred.
In this embodiment, as shown in FIG. 3, the shapes and sizes of the plurality of (six in the example of FIG. 3) electromagnets 24 (and thus the yoke 241 and the electromagnetic coil 242) are all the same. However, the shapes or sizes of the plurality of electromagnets 24 (further, the yoke 241 and the electromagnetic coil 242) may be different between at least two electromagnets 24. However, from the viewpoint of making the magnitude of the magnetic field (magnetic flux) applied to the magnetic fluid MF in the liquid chamber 4 as uniform as possible in the circumferential direction, and simplifying the configuration of the vibration isolator 100 and making it easier to manufacture, As in this embodiment, it is preferable that the shapes and sizes of the plurality of electromagnets 24 (and thus the yoke 241 and the electromagnetic coil 242) are all the same.
Further, as described above, in this embodiment, as shown in FIG. 3, the plurality of electromagnets 24 are provided at equal intervals in the circumferential direction. However, the plurality of electromagnets 24 may not be provided at equal intervals in the circumferential direction. However, from the same viewpoint as above, it is preferable that the plurality of electromagnets 24 are provided at equal intervals in the circumferential direction as in the present embodiment.

The yoke 241 is preferably made of a magnetic material, that is, a metal with high magnetic permeability, so as to form an appropriate magnetic circuit with the inner mounting member 1. More specifically, the yoke 241 is made of iron and/or a metal with high magnetic permeability. Alternatively, it is preferable that the entire structure be made of or contain a metal exhibiting ferromagnetism (ferromagnetic material) such as cobalt. In this embodiment, the yoke 241 is made of iron.

Referring to FIG. 3, in this embodiment, each of the plurality of electromagnets 24, ie, one electromagnet 24, includes two radial yoke parts 241r, a circumferential yoke part 241c, and an electromagnetic coil 242. have.

In this embodiment, the two radial yoke portions 241r each constitute a convex portion 23 (more specifically, at least a portion of the convex portion 23 in the circumferential direction) of the above-mentioned outer mounting member 2. That is, the radial yoke portion 241r has its tip side (radially inner end side) protruding radially toward the liquid chamber 4.
The two radial yoke portions 241r extend in the radial direction. Here, in this specification, "extending in the radial direction" means an extension of a straight line passing through the axis O in a plan view of the vibration isolator 100 projected from the direction of the axis O (see FIG. 3). Not only when it extends along the radial direction (that is, at an angle of 0° with respect to the radial direction), but also when viewed from above, it has a radial component and a relatively small angle with respect to the radial direction. (For example, extending in an inclined direction at an angle of 45 degrees or less, preferably 30 degrees or less, more preferably 15 degrees or less) is also included. As shown in FIG. 3, in this embodiment, each radial yoke portion 241r extends in a direction inclined at an angle of about 15° with respect to the radial direction.

In this embodiment, the circumferential yoke portion 241c connects the two radial yoke portions 241r (more specifically, the radially outer ends of the two radial yoke portions 241r). The yoke 241 includes two radial yoke parts 241r and a circumferential yoke part 241c that are continuously formed and integrated.
The circumferential yoke portion 241c extends in the circumferential direction. Here, in this specification, "extending in the circumferential direction" means a circle centered on the axis O in a plan view of the vibration isolator 100 projected from the direction of the axis O (see FIG. 3). Not only when extending along the circumferential direction, which is the extending direction of (For example, extending at an angle of 45 degrees or less, preferably 30 degrees or less, more preferably 15 degrees or less) is also included. As shown in FIG. 3, in this embodiment, the circumferential yoke portion 241c extends in the tangential direction of the circle.

In this embodiment, the electromagnetic coil 242 is wound around the circumferential yoke portion 241c of the yoke 241. Although the number of turns of the electromagnetic coil is not particularly limited, from the viewpoint of changing the rigidity of the vibration isolator 100 more effectively with the magnetic fluid MF, it is preferable that the number of turns is as large as possible.

The vibration isolator 100 according to the present embodiment configured as described above is connected to the electromagnetic coil 242 by a controller provided outside the vibration isolator 100 (for example, on the vehicle body side). The current flowing through the electromagnetic coil 242 is controlled via the lead wire that is not connected to the electromagnetic coil 242.

Next, with reference to FIGS. 2(a), 2(b), 4, etc., the operation, control method, etc. of the vibration isolating device 100 according to the present embodiment having the above-described configuration will be described.
FIG. 2 is a half sectional view for explaining deformation during operation of the vibration isolator 100 according to the present embodiment, and FIG. 2(a) shows the damper rod immediately after the damper rod is relatively displaced downward. FIG. 2(b) is a diagram showing a state immediately after the damper rod has been relatively displaced upward. In addition, in FIGS. 2A and 2B, the structure of the right half of the vibration isolator 100 is the same as the structure of the illustrated left half.
In FIGS. 2A and 2B, as described above, the liquid chamber 4 is filled with magnetic fluid MF.
As shown in FIG. 2(a), when the damper rod 51 and thus the inner mounting member 1 are displaced (moved) downward in the axial direction relative to the outer mounting member 2 due to the vertical movement of the vehicle (in the figure, the (indicated by an arrow), the magnetic fluid MF in the upper liquid chamber 4a (see FIG. 1) passes through the gap 4c (see FIG. 1) and moves toward the lower liquid chamber 4b. On the other hand, as shown in FIG. 2(b), when the damper rod 51 and thus the inner mounting member 1 are displaced (moved) upward in the axial direction relative to the outer mounting member 2 due to the vertical movement of the vehicle (in the figure, The magnetic fluid MF in the lower liquid chamber 4b (see FIG. 1) passes through the gap 4c (see FIG. 1) and moves toward the upper liquid chamber 4a (indicated by a thick arrow). A certain damping force is generated by the movement of the magnetic fluid MF through the gap 4c. Furthermore, when a current is applied to the electromagnetic coil 242 of the electromagnet 24 during the above-mentioned relative displacement, the magnetic flux generated in the electromagnet 24 passes through the magnetic fluid MF, increasing the viscosity of the magnetic fluid MF, and the damper rod 51 and the inside thereof. The reaction force for displacing the mounting member 1 up and down in the axial direction increases, and as a result, the rigidity of the vibration isolator 100 can be increased. Further, the viscosity of the magnetic fluid MF increases as the magnitude (current value) of the current flowing through the electromagnetic coil 242 increases. Therefore, by controlling the magnitude (current value) of the current flowing through the electromagnetic coil 242, the rigidity of the vibration isolator 100 can be varied as appropriate, and in turn, the rigidity of the vibration isolator 100 can be suitably controlled.

In addition, although the case where a force is applied to the inner mounting member 1 in the vertical direction and a relative displacement occurs in the vertical direction between the inner mounting member 1 and the outer mounting member 2 has been described above, the inner mounting member 1 is moved in the radial direction (e.g. , in the front-rear direction and/or left-right direction of the vehicle) and a relative displacement occurs in the radial direction between the inner mounting member 1 and the outer mounting member 2, especially in the liquid chamber 4 including the gap 4c. Due to the magnetic fluid MF held within, the rigidity of the vibration isolator 100, particularly in the radial direction, can also be increased, and relative displacement in the radial direction can be suppressed.

The current value to be applied to the electromagnetic coil 242 is determined either outside the vibration isolator 100 (for example, on the vehicle body side), or inside the vibration isolator 100 as in the third embodiment described later with reference to FIGS. 7 to 9. It can be controlled by a controller installed in the
For example, when the vehicle is traveling on a good road and there is little vertical movement of the vehicle, the reaction force of the damper rod 51 (damping force of the shock absorber) is not high, so the controller does not apply current to the electromagnetic coil 242. Alternatively, by reducing the current value flowing through the electromagnetic coil 242 and lowering the rigidity of the vibration isolator 100, transmission of high frequency vibrations such as road noise can be reduced. On the other hand, for example, in a situation where the vehicle is traveling on a rough road where the vehicle shakes a lot, or in a situation where the driver operates the steering wheel and the vehicle turns, the controller applies current to the electromagnetic coil 242 or causes the electromagnetic coil 242 to By increasing the current value passed through the damper rod 51 and increasing the rigidity of the vibration isolator 100, the damping force of the shock absorber including the damper rod 51 can be actively utilized to suppress vibration. As a result, by controlling the current value by the controller, NV performance (noise/vibration suppression performance) can be improved without sacrificing steering stability and ride comfort.
Here, the above-mentioned scene in which the vehicle is can be determined based on the load detected by the load sensor, for example, as in the third embodiment described later with reference to FIGS. 7 to 9. can. Further, the current value flowing through the electromagnet 24 may be controlled continuously (i.e., changed continuously) or intermittently (i.e., changed intermittently) by the controller. Also) good.

FIG. 4 is an enlarged view of section A in FIG. 3 for explaining the magnetic circuit formed in the vibration isolator of FIG. 1. FIG.
In the vibration isolator 100 according to the present embodiment shown in FIGS. 1 and 3, when a current is applied to the electromagnetic coil 242 of the electromagnet 24, the yoke 241 (that is, the two radial yoke parts 241r and the circumferential yoke part 241c) As a result, as shown in FIG. 4 (FIG. 4 shows only the lines of magnetic force ML generated outside the electromagnet 24), the lines of magnetic force ML are caused by the circumferential yoke portion 241c of the electromagnet 24 (not shown in FIG. 4). , a radial yoke portion 241r (241ra (see also FIG. 3)) on one side in the circumferential direction of the same electromagnet 24, an inner mounting member 1, a radial yoke portion 241r (241rb (see also FIG. 3) on the other side in the circumferential direction of the same electromagnet 24). )) and the circumferential yoke portion 241c of the same electromagnet, and a magnetic circuit is formed between them.
As partially shown in the upper part of FIG. 4, the magnetic lines of force ML also include a circumferential yoke portion 241c (not shown in FIG. 4) of one electromagnet 24 and a radial yoke portion 241r on one side in the circumferential direction of the electromagnet 24. (241ra (see also FIG. 3)), radial yoke portion 241r (241rb (see also FIG. 3)) on the other side in the circumferential direction of another electromagnet 24 circumferentially adjacent to the electromagnet 24 (not shown in FIG. 4). ), the original circumferential yoke portion 241c of the original electromagnet 24, and a magnetic circuit is also formed between these.
Therefore, in this embodiment, the liquid chamber 4 provided between the radial yoke portion 241r and the inner mounting member 1, and the magnetic fluid MF sealed in the liquid chamber 4, are placed on the magnetic circuit and the magnetic field is By applying current to the electromagnetic coil 242 of the electromagnet 24, the viscosity can be increased or changed.

Here, in this embodiment, as shown in FIG. 4, the vibration isolator 100 includes circumferentially adjacent radial yoke parts 241ra and 241rb (more specifically, the tips of the radial yoke parts 241ra and 241rb, respectively). (radially inner ends)) are preferably constructed and/or controlled so that they have different poles. Here, "the circumferentially adjacent radial yoke parts 241ra and 241rb" refer to the circumferentially adjacent radial yoke parts 241ra and 241rb that are in the same electromagnet 24 and are circumferentially adjacent to each other. It includes both radial direction yoke parts 241ra and 241rb that are in another electromagnet 24 and are adjacent to each other in the circumferential direction (see FIG. 3). In this case, the lines of magnetic force (magnetic flux) generated by passing current through the electromagnetic coil 242 of the electromagnet 24 do not cancel each other out, and the magnitude of the magnetic field (magnetic flux density) applied to the magnetic fluid MF in the liquid chamber 4 is reduced. , can be made larger more effectively. In this embodiment, as shown in FIG. 4, in the vibration isolator 100, the radial yoke portion 241ra (more specifically, the tip portion (radially inner end portion) of the radial yoke portion 241ra) is the N pole, and the radial direction yoke portion 241ra is The directional yoke portion 241rb (more specifically, the tip portion (radially inner end portion) of the radial yoke portion 241rb) is configured and/or controlled to be an S pole.
However, the vibration isolator 100 does not need to be configured and/or controlled so that the circumferentially adjacent radial yoke parts 241ra and 241rb have different poles.

In this embodiment, as described above, in order to make the circumferentially adjacent radial yoke parts 241ra and 241rb have different poles, for example, a plurality of (six in the example of FIG. 3) In the electromagnet 24, how each electromagnetic coil 242 is wound around the yoke 241 (right-handed or left-handed when viewed from one side in the circumferential direction) and/or the direction of the current flowing through each electromagnetic coil 242 (circumferential direction) You can adjust whether the image is viewed in the same direction or in a different direction.
For example, in this embodiment, the winding method of each electromagnetic coil 242 in the plurality of electromagnets 24 may be the same (right-handed or left-handed when viewed from one side in the circumferential direction). In this case, by simply controlling the directions of the currents flowing through the respective electromagnetic coils 242 in the plurality of electromagnets 24 so that they are the same (same direction when viewed in the circumferential direction), it is possible to The direction yoke portions 241ra and 241rb can have different poles.
However, the configuration and control method for making the circumferentially adjacent radial yoke parts 241ra and 241rb have different poles are not particularly limited.

Next, the main effects of the above-described embodiment will be explained below.
First, in this embodiment, the outer mounting member 2 is formed with a convex portion 23 that projects in the radial direction toward the liquid chamber 4, and the liquid chamber 4 is filled with magnetic fluid MF. At least a portion of the convex portion 23 of the mounting member 2 in the circumferential direction is constituted by at least a portion of an electromagnet 24 including a yoke 241 and an electromagnetic coil 242 wound around the yoke 241. There are multiple locations.
That is, according to the present embodiment, the liquid chamber 4 is filled with magnetic fluid MF, and at least a portion of the convex portion 23 of the outer mounting member 2 that protrudes toward the liquid chamber 4 is a part of the electromagnet 24 that includes the electromagnetic coil 242. By passing a current through the electromagnetic coil 242, it is possible to change the viscosity of the magnetic fluid MF in the liquid chamber 4 and, in turn, change the rigidity of the vibration isolator 100.
Further, according to the present embodiment, the outer mounting member 2 has a convex portion 23 that protrudes toward the liquid chamber, and at least a portion of the convex portion 23 is configured by at least a portion of the electromagnet 24. Since the structure is simple, vibration isolation is better than, for example, when a partition wall is provided that divides the liquid chamber into two, and one electromagnet consisting of a circumferential passage, a yoke, and an electromagnetic coil is formed within the partition wall. The structure of the device 100 is simplified, and the structure of the vibration isolator 100 does not become complicated even when the number of electromagnets is increased in order to achieve a sufficient change in rigidity.
Further, according to the present embodiment, since a plurality of electromagnets 24 (and by extension, electromagnetic coils 242) are provided in the circumferential direction, the magnitude of the magnetic field (magnetic flux density) applied to the magnetic fluid MF in the liquid chamber 4 can be made sufficiently large, and as a result, the rigidity of the vibration isolator 100 can be made sufficiently large and/or sufficiently changed.
As described above, according to the vibration isolating device 100 according to the present embodiment, the rigidity can be sufficiently changed with a simple configuration while using a magnetic fluid.

In this embodiment, each of the plurality of electromagnets 24 includes two radial yoke portions 241r that each constitute a convex portion 23 and extend in the radial direction, and a circumference that connects the two radial yoke portions 241r and extends in the circumferential direction. It has a direction yoke portion 241c and an electromagnetic coil 242 wound around the circumferential yoke portion 241c.
In this case, regarding the electromagnets 24, it is only necessary to arrange a plurality of electromagnets 24 in the circumferential direction, each having a simple shape in which an electromagnetic coil 242 is wound around a yoke 241 that is U-shaped in plan view. The configuration of the shaking device 100 becomes simpler.

Further, in this embodiment, the shapes and sizes of the plurality of electromagnets 24 (further, the yokes 241 and the electromagnetic coils 242) provided in the circumferential direction are all the same.
In this case, the structure of the vibration isolator 100 is further simplified and manufacturing becomes easier.

Furthermore, in this embodiment, one electromagnet 24 has two radial yoke parts 241r, and a plurality of electromagnets 24 are provided in the circumferential direction. That is, in this embodiment, the total number of radial yoke portions 241r in the entire circumferential direction is an even number.
In this case, for example, the winding methods of the respective electromagnetic coils 242 in the plurality of electromagnets 24 are the same (right-handed or left-handed when viewed from one side in the circumferential direction), and the respective electromagnetic coils 242 in the plurality of electromagnets 24 are By simply controlling the directions of the currents flowing through the electromagnetic coils 242 so that they are the same (same direction when viewed in the circumferential direction), it is possible to ensure that the directions of the currents flowing in the electromagnetic coils 242 are the same (same direction when viewed in the circumferential direction). The tips (radially inner ends) of the radial yoke portion 241r have different poles, and the magnitude of the magnetic field (magnetic flux density) applied to the magnetic fluid MF in the liquid chamber 4 is It can be enlarged more effectively.

In addition, in this embodiment, an upper stopper rubber 11 is fixed to the top 1c of the inner mounting member 1 and the lower part of the top 1c, and a lower stopper rubber is fixed to the outer mounting member 2 and the lower part of the outer mounting member 2. 21 serve as stoppers when the damper rod 51 (as a result, the inner mounting member 1) is relatively displaced up and down in the axial direction.
In this case, especially when the vibration isolator 100 receives a large input in the vertical direction, the excessive stroke of the damper rod 51 (and the inner mounting member 1) in the vertical direction is suppressed, and the vehicle body supported by the vibration isolator 100 is The damping force of the shock absorber including the damper rod 51 can be sufficiently transmitted to the damper rod 51 and the like.

(Second embodiment)
Next, a vibration isolating device 100 according to a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In the second embodiment, the same members or parts as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.
The vibration isolator 100 according to the second embodiment of the present invention differs from the vibration isolator 100 according to the first embodiment of the present invention only in the configuration of the electromagnet 24, and the other points are the vibration isolator 100 according to the first embodiment. 100. Below, the explanation will mainly focus on the points that are different from the first embodiment.

FIG. 5 is a half sectional view showing a vibration isolator according to a second embodiment of the present invention, taken along the ZZ line in FIG. 6, which includes the axis of the vibration isolator. FIG. 6 is a partial sectional view showing the vibration isolator of FIG. 5 in a section similar to that of FIG. In addition, in FIG. 5, the configuration of the right half of the vibration isolator 100 is the same as the configuration of the illustrated left half.
Referring to FIGS. 5 and 6, in this embodiment, the yoke 241 of the electromagnet 24 includes a plurality of radial yoke portions 241r that respectively constitute the convex portion 23 of the outer mounting member 2 and extend in the radial direction; It includes a circumferential yoke portion 241c that connects the radial yoke portions 241r and extends over the entire circumferential direction (that is, the entire circumference).

More specifically, in this embodiment, the plurality of radial yoke parts 241r each extend in the radial direction, similarly to the first embodiment, and the convex part 23 (more specifically, constitutes at least a portion of the convex portion 23 in the circumferential direction). That is, the radial yoke portion 241r has its tip side (radially inner end side) protruding radially toward the liquid chamber 4. Further, as shown in FIG. 6, a large number (24 pieces in the example of FIG. 6) of the radial yoke portions 241r are arranged radially around the axis O (that is, along the radial direction) at equal intervals in the circumferential direction. It is set in.
Furthermore, in this embodiment, the circumferential yoke portion 241c extends in the circumferential direction, as in the first embodiment, and includes a plurality of radial yoke portions 241r (more specifically, a plurality of radial yoke portions 241r). However, unlike the first embodiment, the circumferential yoke portion 241c extends over the entire circumferential direction.
The plurality of radial yoke parts 241r and circumferential yoke parts 241c may be formed separately and connected to each other by welding or the like, or may be formed continuously as one body. good. Furthermore, the plurality of radial yoke parts 241r and circumferential yoke parts 241c may simply be in contact with each other.
In this embodiment, the material of the yoke 241 is the same as that in the first embodiment described above.

Further, referring to FIG. 6, in this embodiment, each of the plurality of electromagnets 24 is connected to one radial yoke portion 241r of the plurality of radial yoke portions 241r described above, It has an electromagnetic coil 242 wound around 241r.
Thus, in this embodiment, unlike the first embodiment, the electromagnetic coil 242 is wound around the radial yoke part 241r instead of the circumferential yoke part 241c.
Note that in this specification, each electromagnet 24 having one coil is counted as one.

According to the vibration isolating device 100 according to the present embodiment configured as above, the electromagnetic coil 242 is wound around a large number of radial yoke parts 241r arranged radially around the axis O. For example, compared to the vibration isolator 100 according to the first embodiment described above, in a limited space, the number of electromagnetic coils 242 and/or the total number of turns of the electromagnetic coils 242 (more than the number of turns in the radial direction than in the circumferential yoke portion 241c). By wrapping around the yoke portion 241r, the total length of the yoke portion that can be wound can be increased, and as a result, the rigidity of the vibration isolator 100 can be changed more easily.
Other configurations and effects of the vibration isolator 100 of this embodiment are the same as those of the vibration isolator 100 of the first embodiment described above.

In addition, in this embodiment as well, similarly to the first embodiment, the vibration isolator 100 has two adjacent radial yoke portions 241r in the circumferential direction (more specifically, a distal end portion (radial direction Preferably, the inner ends)) are configured and/or controlled such that they are of mutually different poles.
Therefore, in this embodiment, for example, as shown in FIG. 6, the electromagnetic coil 242 is not wound between two circumferentially adjacent radial yoke parts 241r around which the electromagnetic coil 242 is wound. Preferably, one radial yoke portion 241r is provided. In this case, for example, the winding method of the plurality of electromagnetic coils 242 is the same (right-handed or left-handed when viewed from the axis O side), and the direction of the current flowing through the plurality of electromagnetic coils 242 is the same (the axis O By simply controlling the radial yoke portions 241r (more specifically, the tips of the radial yoke portions 241r (radially The inner ends)) have different poles from each other, and as a result, the magnitude of the magnetic field (magnetic flux density) applied to the magnetic fluid MF in the liquid chamber 4 can be increased more effectively.

(Third embodiment)
Next, a vibration isolating device 100 according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 9. In the third embodiment, the same members or parts as in the second embodiment are given the same reference numerals, and the explanation thereof will be omitted.
The vibration isolator 100 according to the third embodiment of the present invention differs from the vibration isolator 100 according to the second embodiment of the present invention only in the configuration of the outer mounting member 2, and the other points are different from the vibration isolator 100 according to the second embodiment. It is substantially the same as the shaking device 100. The following will mainly focus on the differences from the second embodiment.

FIG. 7 is a half sectional view showing a vibration isolator according to a third embodiment of the present invention, taken along the ZZ line in FIG. 6, which includes the axis of the vibration isolator. FIG. 8 is an explanatory diagram for explaining the overall configuration of a vibration isolating system including the vibration isolating device of FIG. FIG. 9 is an equivalent model diagram for explaining the vibration isolation form of the vibration isolator shown in FIG.
As shown in FIGS. 7 and 8, in this embodiment, the outer mounting member 2 includes a load sensor 6 and a control unit 7. As shown in FIG. 8, the control unit 7 includes a controller 71 and an amplifier 72. Therefore, in this embodiment, the outer mounting member 2 incorporates the load sensor 6 and the controller 71. Note that "built-in" does not necessarily mean that the target member is completely buried within the outer mounting member 2, and may be held within the outer mounting member 2 rather than outside the outer mounting member 2. It means good.

Note that the vibration isolation form of the vibration isolation device 100 of this embodiment including the load sensor 6 can be modeled as shown in FIG. 9 using a mass element M, a damper element C, and a spring element K.
In FIG. 9, a portion of the damper element C corresponds to the magnetic fluid MF sealed within the liquid chamber 4.

Load sensor 6 detects the input load to vibration isolator 100. More specifically, in this embodiment, the load sensor 6 detects the load input to the actuator section 2a side of the outer mounting member 2, which will be described later, as shown in FIG. The configuration and type of the load sensor 6 are not particularly limited as long as the input load to the vibration isolator 100 can be detected. The load sensor 6 may be, for example, a load cell, a piezoelectric element, or the like, or may be a Hall element, a capacitance sensor, or the like for calculating relative distance.
The controller 71 instructs and controls the current that the amplifier 72 causes to flow through the electromagnetic coil 242, for example, by executing a program stored in the controller 71. The controller 71 may be configured to include one or more processors such as a CPU (Central Processing Unit), for example. Communication between the controller 71 and the amplifier 72 or other components may be wired communication or wireless communication.
Amplifier 72 causes current to flow through electromagnetic coil 242 according to instructions from controller 71.
As shown in FIG. 7, the vibration isolating system including the vibration isolating device 100 of this embodiment includes a control unit 7 (controller 71 and amplifier 72) outside the vibration isolating device 100 (for example, in the vehicle body). It may be provided with a power source 8 for starting. However, the power source 8 may also be built into the vibration isolator 100.

In this embodiment, the controller 71 controls the value of the current flowing through the electromagnetic coil 242 based on the load detected by the load sensor 6 (hereinafter also referred to as "detected load").
More specifically, the controller 71 can control the current value using the detected load, for example, as follows.
For example, if the detected load determines that the load input to the vehicle is a small input (for example, when the vehicle is traveling on a good road and there is little vertical movement of the vehicle), do not apply current. Alternatively, by significantly lowering the current value, the rigidity of the vibration isolator 100 is lowered to suppress transmission of high frequency vibrations such as road noise.
On the other hand, for example, when a detected load causes a large load input to the vehicle (for example, when the vehicle is driving on a rough road where it shakes a lot, or when the vehicle is turning due to the driver operating the steering wheel). If it is determined that there is, the vibration is suppressed by increasing the current value and increasing the rigidity of the vibration isolator 100 to actively utilize the damping force of the shock absorber including the damper rod 51. At this time, a coefficient may be set to efficiently utilize the damping force of the shock absorber, and the input load and rigidity may be adjusted to be optimal. This coefficient may be linear or non-linear. More specifically, the damping force of a shock absorber is caused by friction, which accounts for a large proportion especially at small inputs, and the viscous damping due to the oil in the shock absorber also has nonlinear characteristics depending on the valve, so the combination of these It may be better to adjust the coefficients so that the input-output relationship is optimal.
Furthermore, for example, if the detected load determines that the load input to the vehicle is an intermediate input between the above-mentioned small input and large input (for example, when the vehicle is running on a normal road surface), , the current value is adjusted so that the vibration isolator 100 exerts a damping force proportional to the detected load.
Here, the determination as to whether the load input is a small input, a large input, or a medium input can be made using, for example, the amplitude of the detected load or the frequency of the amplitude fluctuation of the detected load. When the judgment is made using the amplitude of the detected load, for example, if the amplitude is 2N or less, it is a small input, if it is 10 to 20N, it is a large input, and if it is an intermediate value, it is a medium input. It may be determined and controlled. In addition, if the judgment is made using the frequency of the amplitude fluctuation of the detected load, for example, if the frequency is 25 Hz or more, it is considered a small input, if it is 5 Hz or less, it is a large input, and if it is an intermediate value. may be determined to be a medium input and controlled.

In this embodiment, as shown in FIG. 7, the outer attachment member 2 includes an actuator section 2a including an electromagnet 24, and a member attachment section 2b attached to the vibration generating section or the vibration receiving section.
Here, as shown in FIG. 7, the actuator portion 2a of the outer attachment member 2 is a portion disposed radially inward as a whole than the member attachment portion 2b, and includes an electromagnet 24. On the other hand, the member attachment portion 2b of the outer attachment member 2 is a portion that is disposed radially outward than the actuator portion 2a as a whole. In this embodiment, the member attachment portion 2b has a control unit 7 built therein.

Further, in this embodiment, as shown in FIG. 7, the actuator section 2a and the member attachment section 2b are connected via a load sensor 6 and an elastic body consisting of a connecting rubber 22 and a lower stopper rubber 21. There is. In other words, the load sensor 6 and the elastic body are interposed between the actuator section 2a and the member attachment section 2b.
More specifically, in the example of FIG. 7, the load sensor 6 includes a protrusion 2ap that protrudes radially outward at the upper end side of the actuator portion 2a, and a protrusion portion 2ap that protrudes radially inward at the lower end side of the member attachment portion 2b. 2 bp via a mounting plate 61. The connecting rubber 22, which forms part of the elastic body, has a radially extending portion and an axially extending portion, and is between the actuator portion 2a and the protruding portion 2bp of the member attachment portion 2b. is fixed to. Further, at least a portion of the connecting rubber 22 and the lower stopper rubber 21 that constitute the elastic body, including at least the connecting rubber 22, is made of relatively high rigidity rubber.

According to the vibration isolator 100 according to the present embodiment configured as described above, the outer mounting member 2 incorporates the load sensor 6 and the controller 71, and the controller 71 has a built-in load sensor 6 and a controller 71. Since the value of the current flowing through the electromagnetic coil 242 is controlled based on the load, there is no need to separately install the controller 71 or the like outside the vibration isolator 100 using, for example, complicated wiring or many terminals. It is possible to control the rigidity of the vibration isolator 100 in accordance with the input load by using a single item of the vibration isolator 100, except for the vibration isolator 100. In other words, the rigidity of the vibration isolator 100 can be controlled with a simple system configuration.

Further, according to this embodiment, the actuator portion 2a and the member attachment portion 2b of the outer attachment member 2 are connected via the load sensor 6 and the elastic body.
In this case, compared to the case where only the load sensor 6 is interposed between the actuator section 2a and the member attachment section 2b, a part of the input load is borne by the elastic body, and the entire input load is borne by the load sensor 6. Not burdened. Therefore, in this case, failure of the load sensor 6 can be suppressed.
The other configurations and effects of the vibration isolator 100 of this embodiment are the same as those of the vibration isolator 100 of the second embodiment described above.

What has been described above describes exemplary embodiments of the invention, and various modifications may be made without departing from the scope of the claims.

The vibration isolator according to the present invention can be suitably used for any vibration isolator, and in particular, for example, a strut mount placed on the top of a damper such as a vehicle shock absorber, and a cab mount installed in the cabin of a vehicle. It can be suitably used as, etc.

1: Inner mounting member, 1a: Bottom, 1b: Side, 1c: Top,
11: Upper stopper rubber,
2: Outer mounting member, 2a: Actuator section, 2ap: Projection section,
2b: member attachment part, 2bp: protrusion part, 20: outer attachment member main body part,
21: Lower stopper rubber (elastic body), 22: Connection rubber (elastic body), 23: Convex part,
24: Electromagnet, 241: Yoke, 241c: Circumferential yoke part,
241r, 241ra, 241rb: radial yoke portion, 242: electromagnetic coil,
3: Body rubber (elastic body), 31: Recessed part, 32: Mounting plate,
33a, 33b: Yamabe,
4: liquid chamber, 4a: upper liquid chamber, 4b: lower liquid chamber, 4c: gap,
4eo: radially outer end;
51: Damper rod, 52: Bump cap, 53: Coil spring,
6: Load sensor, 61: Mounting plate,
7: Control unit, 71: Controller, 72: Amplifier,
8: Power supply,
100: vibration isolator,
AD: Axial direction, B1, B2: Bolt, C: Damper element, CD: Circumferential direction,
K: Spring element, M: Mass element, MF: Magnetic fluid, ML: Line of magnetic force, O: Axis line,
RD: Radial direction

Claims (5)

an inner mounting member, a cylindrical outer mounting member, an elastic body disposed between the inner mounting member and the outer mounting member, and a liquid chamber in which the elastic body forms at least a part of a chamber wall. A vibration isolator comprising:
The outer mounting member is formed with a convex portion that projects in a radial direction toward the liquid chamber,
A magnetic fluid is sealed in the liquid chamber,
At least a portion in the circumferential direction of the convex portion of the outer mounting member is constituted by at least a portion of an electromagnet including a yoke and an electromagnetic coil wound around the yoke,
The vibration isolator includes a plurality of electromagnets provided in a circumferential direction. Each of the plurality of electromagnets includes two radial yoke portions each forming the convex portion and extending in the radial direction, a circumferential yoke portion connecting the two radial yoke portions and extending in the circumferential direction, and The vibration isolator according to claim 1, further comprising an electromagnetic coil wound around the circumferential yoke portion. The yoke includes a plurality of radial yoke parts each forming the convex part and extending in the radial direction, and a circumferential yoke part connecting the plurality of radial yoke parts and extending over the entire circumferential direction. ,
Each of the plurality of electromagnets has one radial yoke part of the plurality of radial yoke parts, and an electromagnetic coil wound around the one radial yoke part. The vibration isolator according to item 1. The outer mounting member has a built-in load sensor that detects an input load to the vibration isolator and a controller,
The vibration isolator according to any one of claims 1 to 3, wherein the controller controls a current value flowing through the electromagnetic coil based on the load detected by the load sensor. The outer mounting member has an actuator section including the electromagnet, and a member mounting section attached to the vibration generating section or the vibration receiving section,
The vibration isolator according to claim 4, wherein the actuator section and the member attachment section are connected via the load sensor and an elastic body.

Images