JP5418389B2 - Anti-vibration material - Google Patents

Description

  The present invention relates to a vibration isolating member.

Conventionally, an engine that vibrates by itself, a precision instrument mounted on a moving body, and a building that is affected by an earthquake are fixed to a fixed part via an anti-vibration device, thereby suppressing vibration. ing.
In such an anti-vibration device, it may be required to attenuate the vibration of the vibration-proof object as soon as possible. In such a case, a variable attenuation device capable of adjusting the damping force as shown in Patent Document 1 is used. Is used.

JP 2005-127443 A

  However, according to the variable damping device shown in Patent Document 1, the damping characteristic of the vibration isolator can be changed, but the rigidity cannot be changed.

On the other hand, when the vibration of the vibration isolation object is suppressed by the vibration isolation device, a plurality of vibration isolation rubbers are usually fixed to the vibration isolation object in order to suppress vibration from various directions.
When acceleration is applied statically or quasi-statically to a vibration-proof object supported by such a plurality of vibration-proof rubbers, the vibration-proof rubbers are compressed in the compression direction due to differences in their mounting positions. Subjected to loads with different directions and sizes such as tension direction.
The rigidity of the anti-vibration rubber has a load dependency that varies depending on the load received by the anti-vibration rubber. For this reason, when acceleration is applied statically or quasi-statically to the vibration isolation object, the rigidity varies among a plurality of vibration isolation rubbers fixed to the vibration isolation object. Therefore, if acceleration is applied from the direction inclined with respect to the anti-vibration object and the rigidity of the anti-vibration rubber subjected to the tensile load is greatly reduced, etc. Movement will occur.
When rotational motion occurs in the vibration-proof object in this way, the vibration-proof object may interfere with the fixed surface. Therefore, in order to prevent the interference, a large installation space for the vibration-proof object is secured. There are disadvantages from the surface.
For this reason, a method is considered in which two anti-vibration rubbers are paired and the rigidity is constant in the pair of anti-vibration rubbers even if a force is applied in either the compression direction or the tensile direction, but the structure is complicated. In addition, it is necessary to secure a wide installation space in this case as well.

  Even when the variable damping device shown in Patent Document 1 is used, since the rigidity cannot be changed as described above, the rotational motion of the vibration-proof object cannot be suppressed.

  The present invention has been made in view of the above-described problems, and even in a simple arrangement configuration, the displacement of the image stabilization object is reliably suppressed while suppressing the transmission of vibration from the outside to the image stabilization object. An object of the present invention is to provide an anti-vibration member that can be used.

  The present invention adopts the following configuration as means for solving the above-described problems.

  A first aspect of the present invention is a vibration isolating member that is fixed to a vibration isolating object and suppresses the vibration of the vibration isolating object, and forms a magnetic field by receiving a load with a rigidity changing portion made of a magnetic elastomer. In addition, a configuration is adopted in which a super magnetostrictive section is provided that changes the strength of the magnetic field in the same direction as the direction in which the magnitude of the load received from the vibration isolation object changes.

  According to a second invention, in the first invention, a configuration is adopted in which the rigidity changing portion is disposed with the giant magnetostrictive portion interposed therebetween.

  According to a third invention, in the first or second invention, a configuration is adopted in which the giant magnetostrictive portion is disposed with the rigidity changing portion interposed therebetween.

  According to a fourth invention, in any one of the first to third inventions, the rigidity changing portion and the giant magnetostrictive portion are arranged in series with respect to an acting direction of a load received from the vibration isolating object. Adopt the configuration.

  According to the present invention, when a large acceleration is not applied statically or quasi-statically to the vibration isolating object, there is almost no load acting on the super magnetostrictive part from the vibration isolating object, and the magnetic field generated by the super magnetostrictive part is generated. Since the rigidity change portion is low and the rigidity of the rigidity change portion is kept low, the amount of change from the initial stiffness of the rigidity change portion is small, and transmission of vibration from the outside to the vibration isolation object can be suppressed.

On the other hand, when a large acceleration is applied statically or quasi-statically to the vibration isolation object, the load acting on the giant magnetostrictive part from the vibration isolation object is large, and the magnetic field generated by the giant magnetostriction part becomes strong. The rigidity of the changed portion is higher than the initial rigidity, and the amount of movement of the vibration-proof object with respect to the acceleration applied statically or quasi-statically is suppressed.
Further, the giant magnetostrictive portion generates a magnetic field regardless of the tensile load and the compressive load. For this reason, when a load is applied to the vibration isolator of the present invention, the rigidity of the rigidity changing portion is increased regardless of the direction. Therefore, there is no reduction in rigidity due to receiving a tensile load unlike conventional anti-vibration rubber, and the variation in rigidity between anti-vibration members increases when multiple anti-vibration members are fixed to the anti-vibration object. This can suppress the rotational motion of the vibration-proof object.
As described above, according to the present invention, when the vibration isolating object moves, the displacement of the vibration isolating object due to the movement can be surely suppressed.

In addition, according to the present invention, since the rigidity is increased regardless of the tensile load and the compressive load as described above, the displacement of the vibration isolating object is no matter how the vibration isolating object is arranged. The amount can be suppressed.
Therefore, according to this invention, even if it is a simple arrangement structure, the displacement of a vibration isolating object can be suppressed.

  As described above, according to the present invention, even with a simple arrangement configuration, it is possible to reliably suppress displacement of the image stabilization target object while suppressing transmission of vibration from the outside to the image stabilization object.

It is a perspective view which shows schematic structure of the vibration isolator in 1st Embodiment of this invention. It is a perspective view which shows the example of arrangement | positioning of the vibration isolator in 1st Embodiment of this invention. It is a schematic diagram which shows the movement of the vibration proof object in the case of using the conventional vibration proof rubber. It is a schematic diagram which shows the movement of the vibration proof object in the case of using the vibration proof member in 1st Embodiment of this invention. It is a perspective view which shows schematic structure of the vibration isolator in 2nd Embodiment of this invention. It is a perspective view which shows schematic structure of the vibration isolator in 3rd Embodiment of this invention.

  Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration of a vibration isolating member 1 of the present embodiment.
As shown in this figure, the vibration isolator 1 of the present embodiment includes a stiffness change layer 2 (stiffness change portion) made of a magnetic elastomer and a giant magnetostriction layer 3 (giant magnetostriction portion) made of a giant magnetostrictive element. Yes.

The stiffness changing layer 2 is a layer whose stiffness changes according to the strength of the exposed magnetic field, and is made of a magnetic elastomer that is an elastomer material into which magnetic powder is kneaded.
More specifically, the stiffness changing layer 2 becomes more rigid as the strength of the exposed magnetic field becomes stronger, and becomes lower as the strength of the exposed magnetic field becomes weaker. That is, the stiffness changing layer 2 changes its own stiffness in the same direction as the direction of change of the intensity of the exposed magnetic field.

  As shown in FIG. 1, in the vibration isolator 1 of the present embodiment, the stiffness changing layer 2 is disposed on both sides of the giant magnetostrictive layer 3 so as to sandwich the giant magnetostrictive layer 3. Each stiffness changing layer 2 is in close contact with the giant magnetostrictive layer 3 via an adhesive.

Of the two stiffness change layers 2 arranged with the giant magnetostrictive layer 3 sandwiched therebetween, the stiffness change layer 2 on one side is fixed to the object A (see FIG. 2), and the stiffness change layer on the other side is fixed. 2 is fixed to a fixing portion W to which the vibration-proof object A is fixed.
That is, when the vibration isolation member 1 of the present embodiment is installed between the vibration isolation object A and the fixed portion W, the stiffness changing layer 2 and the giant magnetostrictive layer 3 are fixed to the vibration isolation object A. Arranged in series with the part W. More specifically, in the vibration isolator 1 of the present embodiment, the stiffness changing layer 2 and the giant magnetostrictive layer 3 are arranged in series with respect to the direction of action of the load received from the vibration isolating object A.

The giant magnetostrictive layer 3 is a layer that generates a magnetic field having a strength corresponding to the amount of strain when the load is distorted (deformed) and is made of a giant magnetostrictive material.
More specifically, the giant magnetostrictive layer 3 generates a stronger magnetic field as the received load increases and the strain amount increases, and generates a weak magnetic field as the received load decreases and the strain amount decreases.

  The anti-vibration member 1 of the present embodiment configured as described above is arranged between the anti-vibration object A and the fixed part W, for example, as shown in FIG. It is fixed with respect to W. That is, the anti-vibration target A is fixed to the fixed portion W via the plurality of anti-vibration members 1 of the present embodiment.

  According to the vibration isolating member 1 of the present embodiment as described above, when a large acceleration is not applied to the vibration isolating object A statically or quasi-statically, the vibration isolating object A acts on the giant magnetostrictive layer 3. Because the magnetic field generated by the giant magnetostrictive layer 3 is weak and the rigidity of the stiffness changing layer 2 is kept low, the amount of change from the initial stiffness of the stiffness changing layer 2 is small and vibration is prevented from the outside. Transmission of vibration to the object A can be suppressed.

On the other hand, when a large acceleration is applied statically or quasi-statically to the vibration isolation object A, the load acting on the giant magnetostrictive layer 3 from the vibration isolation object A is large, and the magnetic field generated by the giant magnetostriction layer 3 is strong. Therefore, the rigidity of the rigidity change layer 2 is increased, and the amount of movement of the image stabilization target A with respect to the acceleration applied statically or quasi-statically is suppressed.
Further, the giant magnetostrictive layer 3 generates a magnetic field regardless of the tensile load and the compressive load. For this reason, when a load is applied to the vibration isolation member of the vibration isolation member 1 of the present embodiment, the rigidity of the stiffness changing layer 2 is increased regardless of the direction. Therefore, there is no reduction in rigidity due to receiving a tensile load unlike conventional anti-vibration rubber, and the variation in rigidity between anti-vibration members increases when multiple anti-vibration members are fixed to the anti-vibration object. Can be suppressed, and the vibration-proof object A can be suppressed from rotating.
Thus, according to the vibration isolating member 1 of the present embodiment, when the vibration isolating object A moves, the displacement of the vibration isolating object A due to the movement can be reliably suppressed.

This will be described in more detail with reference to FIGS. In addition, in order to simplify description, FIG.3 and FIG.4 considers the movement of the vibration-proof object A in a plane. 3 and 4, A indicated by an imaginary line indicates the vibration-proof object A when not displaced (that is, the reference position).
FIG. 3 shows a case where the vibration isolating object 10 is supported by using the vibration isolating rubber 10 (10a to 10d) as in the prior art, and the vibration F is applied when a force F (load) acts on the vibration isolating object A in an oblique direction. 5 is a schematic diagram showing movement of an object A. FIG. Further, FIG. 4 supports the vibration isolation object A using the vibration isolation member 1 of the present embodiment, and the vibration isolation object when the same force F (load) as that in FIG. 3 acts on the vibration isolation object A. It is the schematic diagram which showed the movement of the thing A. FIG.

  When the anti-vibration object A is supported using the anti-vibration rubber 10 (10a to 10d) as in the prior art, the anti-vibration rubbers 10a and 10b receive a small tensile load, and the anti-vibration rubber 10c applies a large tensile load. The vibration isolator rubber 10d receives a large compressive load. For this reason, the rigidity of the anti-vibration rubber 10c is significantly reduced, and the rigidity of the anti-vibration rubber 10d is significantly increased. As a result, the variation in rigidity between the anti-vibration rubbers 10a to 10d increases, and the anti-vibration object A rotates as shown in FIG.

  On the other hand, when the anti-vibration target A is supported using the anti-vibration member 1 (1a to 1d) of the present embodiment, the anti-vibration members 1a and 1c receive a small tensile load, and the anti-vibration members 1b and 1d It will receive a small compressive load. For this reason, all the vibration isolation members 1a to 1d have substantially the same rigidity, and the rotational movement of the vibration isolation object A is suppressed as shown in FIG.

Further, according to the vibration isolator 1 of the present embodiment, the rigidity is increased regardless of the tensile load and the compressive load as described above. When the prevention target body A is displaced, the displacement can be suppressed.
Therefore, according to the vibration isolating member 1 of the present embodiment, the displacement of the vibration isolating object A can be suppressed even with a simple arrangement configuration.

  As described above, according to the vibration isolating member 1 of the present embodiment, even when the vibration isolating object A is displaced while suppressing transmission of vibration from the outside to the image isolating object A even with a simple arrangement configuration. Therefore, it is possible to reliably suppress the displacement of the vibration-proof object A.

Further, in the vibration isolator 1 of the present embodiment, the stiffness changing layer 2 is disposed with the giant magnetostrictive layer 3 interposed therebetween.
For this reason, the rigidity of the stiffness changing layer 2 on both sides is similarly changed by the magnetic field generated from the single giant magnetostrictive layer 3. Therefore, the rigidity distribution in the vibration isolator 1 can be made uniform.

Further, in the vibration isolating member 1 of the present embodiment, the stiffness changing layer 2 and the giant magnetostrictive layer 3 are arranged in series with respect to the acting direction of the load received from the vibration isolating object A.
For this reason, the load from the vibration isolating object A can be reliably applied to the giant magnetostrictive layer 3 through the stiffness changing layer 2.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

FIG. 5 is a perspective view showing a schematic configuration of the vibration isolator 1A of the present embodiment. As shown in this figure, in the vibration isolator 1A of the present embodiment, the giant magnetostrictive layer 3 is disposed on both sides of the stiffness changing layer 2 so as to sandwich the stiffness changing layer 2.
The giant magnetostrictive layer 3 is formed wider than the rigidity changing layer 2 in a plan view, and is configured to function as a flange for connecting to the object A and the fixed portion W.

According to the vibration isolating member 1A of the present embodiment employing such a configuration, since the giant magnetostrictive layer 3 is disposed on both sides of the stiffness changing layer 2 so as to sandwich the stiffness changing layer 2, any one of the If only the magnetostrictive layer 3 is deformed, the stiffness of the stiffness changing layer 2 can be changed.
Therefore, according to the vibration isolating member 1A of the present embodiment, the rigidity of the rigidity changing layer 2 can be reliably changed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those in the first embodiment will be omitted or simplified.

FIG. 6 is a perspective view showing a schematic configuration of the vibration isolating member 1B of the present embodiment. As shown in this figure, the vibration isolating member 1B of the present embodiment has a total of five layers laminated in the order of the stiffness changing layer 2, the giant magnetostrictive layer 3, the stiffness changing layer 2, the giant magnetostrictive layer 3, and the stiffness changing layer 2. It is configured.
That is, in the vibration isolator 1B of the present embodiment, the configuration in which the giant magnetostrictive layer 3 is sandwiched between the stiffness changing layer 2 and the configuration in which the stiffness changing layer 2 and the giant magnetostrictive layer 3 are sandwiched are used.

According to the vibration isolator 1B of the present embodiment that employs such a configuration, since the giant magnetostrictive layer 3 and the stiffness changing layer 2 are arranged in a distributed manner in the stacking direction, the distribution of the magnetic field strength in the stacking direction. It is possible to make the distribution of rigidity uniform in the stacking direction.
Further, by laminating the plurality of stiffness change layers 2 and the giant magnetostrictive layer 3, it is possible to easily increase the thickness of the vibration isolation member 1B without impairing the functionality.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the configuration in which the giant magnetostrictive portion and the stiffness changing portion in the present invention have a layer structure has been described.
However, the present invention is not limited to this, and the shapes of the giant magnetostrictive portion and the stiffness changing portion can be arbitrarily set in consideration of ease of manufacture and ease of arrangement.

Moreover, in the said embodiment, the structure by which the rigidity change layer 2 and the giant magnetostrictive layer 3 were arranged in the acting direction of load was demonstrated.
However, the present invention is not limited to this, and it is also possible to adopt a configuration in which the stiffness changing layer and the giant magnetostrictive layer are arranged in parallel with respect to the acting direction of the load.

  Moreover, the vibration isolating member of the present invention is not limited to a vibration isolating object that receives static or quasi-static acceleration, and can also be used for a stationary vibration isolating object such as a building.

  1, 1A, 1B: Vibration isolating member, 2 ... Rigidity changing layer (rigidity changing part), 3 ... Giant magnetostrictive layer (giant magnetostrictive part), A ... Antivibration object

Claims (4)

A vibration isolation member that is fixed to the vibration isolation object and suppresses vibration of the vibration isolation object,
A rigidity changing portion made of a magnetic elastomer;
A vibration isolating member comprising: a super magnetostrictive portion that forms a magnetic field by receiving a load and changes a magnetic field strength in the same direction as a direction in which the magnitude of the load received from the vibration isolating object changes. .   2. The vibration isolating member according to claim 1, wherein the rigidity changing portion is disposed so as to sandwich the giant magnetostrictive portion.   The vibration isolating member according to claim 1, wherein the giant magnetostrictive portion is disposed with the rigidity changing portion interposed therebetween.   The vibration isolation member according to any one of claims 1 to 3, wherein the rigidity changing portion and the giant magnetostrictive portion are arranged in series with respect to an acting direction of a load received from the vibration isolation object.

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