JP2002048192A - Vibration damper article and installation method of vibration damper article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damper article in which a force to restrain elastic deformation of a coned disc spring working between the coned disc spring and a solid body is reduced and vibration is prevented responding quickly to input vibration. SOLUTION: The coned disc spring 20 is interposed between two physical bodies 12, 14 and a deformation load reduction member 16 is interposed at least on either side of space between the coned disc spring and the physical body. The deformation load reduction member 16 is made of an elastic material or of a viscoelastic material. A supporting member 18 is interposed between the coned disc spring and the deformation load reduction member. Further, the deformation load reduction member can be a lamination layer rubber. The coned disc springs are plurally interposed between the two solid bodies in such a way that a larger diameter end parts 20a or a smaller diameter end parts 20b are made abut against each other and put on top of one another, and the deformation load reduction members are interposed separatingly either of the space between these coned disc springs. The vibration damper article constrains the supporting member allowing initial deformation of the coned disc spring by introduction of initial load and releases the constraint of the supporting member after initial deformation of the coned disc spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator in which a disc spring interposed between two objects is elastically deformed to prevent the propagation (transmission) of vibration between these objects.

[0002]

2. Description of the Related Art Conventionally, an upper structure is supported by the elastic force of a disc spring placed between two objects, for example, between an upper structure and a lower structure and mounted on a support member of the lower structure. In addition, there is known an anti-vibration device that prevents propagation of vibration between upper and lower structures.

[0003] In this vibration isolator, the weight of the upper structure is added to the coned disc spring. When the load changes due to the displacement of the lower structure in the vertical direction due to an earthquake or the like, the disc spring of the vibration isolator increases its inclination angle and the diameter of the lower end in response to the change in the load. Alternatively, it is elastically deformed so as to reduce the diameter, and absorbs the relative displacement of the lower structure with respect to the upper structure, thereby preventing the vibration from being propagated to the upper structure.

[0004]

However, in the above-described conventional vibration isolator, the end of the disc spring constituting the vibration isolator and the support member are installed in contact with each other. For this reason, when the disc spring is elastically deformed so that the diameter of the lower end of the disc spring expands or contracts due to the change in the load, the end of the disc spring and the contact surface of the supporting member that comes into contact with the end of the disc spring. A static friction force for suppressing the elastic deformation of the disc spring is generated between the two.

Therefore, when the force for deforming the disc spring due to the change in load is smaller than the maximum static friction force between the end of the disc spring and the contact surface of the support member, the static friction force is reduced. And the upper structure is supported in a state harder than the original rigidity of the disc spring.

In other words, in the above-described vibration isolator, even if a vibration that deforms the disc spring due to a change in load is smaller than the maximum frictional force between the disc spring and the support member, the vibration is input to the lower structure.
There has been a problem that the anti-vibration effect cannot be obtained because the disc spring is not elastically deformed.

Accordingly, the present invention has been made in view of such a conventional problem, and reduces the force for suppressing the elastic deformation of the disc spring acting between the disc spring and the object, thereby reducing the input vibration. It is an object of the present invention to provide an anti-vibration device that prevents vibration with good responsiveness.

[0008]

According to a first aspect of the present invention, there is provided an anti-vibration device which is interposed between two objects and receives a load exceeding a static frictional force between the two objects to elastically deform the object. In a vibration isolator that prevents the propagation of vibrations between these objects by a disc spring that starts to be deformed, a deformation that causes elastic deformation of the disc spring with a load smaller than the load between the disc spring and at least one of the objects. It is characterized in that a load reducing member is interposed. That is, the load applied to the disc spring changes due to the vibration input to one of the objects, and a force acts on the disc spring in a direction in which the diameter of the end expands and contracts. At this time, since the deformation load reducing member causes the elastic deformation of the disc spring with a force smaller than the static friction force between the disc spring and the object, the disc spring can be elastically deformed more easily than when the disc spring directly contacts the object. . Therefore, even if the load applied between the two objects is small, the disc spring is easily elastically deformed without being restrained, so that vibration can be prevented with good responsiveness to the input load.

According to a second aspect of the present invention, the deformation load reducing member is made of an elastic material. That is, it is possible to easily form a vibration isolator having good responsiveness to an input load only by interposing an elastic material between the disc spring and the object.

According to a third aspect of the present invention, the deformation load reducing member is made of a viscoelastic material. That is, the viscoelastic material is sheared by the elastic deformation of the disc spring due to vibration or the like, and the vibration energy is absorbed by the viscosity of the viscoelastic material. In addition, damping performance due to viscosity can be obtained.

According to a fourth aspect of the present invention, a displacement is provided between the disc spring and the deformation load reducing member along with the elastic deformation of the disc spring, and is input from the disc spring to the deformation load reducing member. A support member is provided to contact the deformation load reducing member to disperse the load. That is, since the support member is interposed between the disc spring and the deformation load reducing member, the disc spring comes into contact with the deformation load reducing member via the support member and the load input from the disc spring is dispersed. The load does not concentrate as in the case where the spring end directly contacts the deformation load reducing member. Therefore, even if the deformation load reducing member has low rigidity, the end of the disc spring does not bite into the deformation load reducing member. Therefore, by using the low-rigid deformation load reducing member, the disc spring can be elastically deformed with a smaller load.

According to a fifth aspect of the present invention, the deformation load reducing member is made of a laminated rubber provided along a circumferential direction of the disc spring. That is, the laminated rubber is sheared and deformed by the force deforming in the direction in which the diameter of the disc spring expands and contracts, and the disc spring can be easily elastically deformed. Further, since the vibration damping effect of the laminated rubber in the direction orthogonal to the direction of displacement between the objects by the disc spring can be obtained, a three-dimensional vibration damping effect can be obtained.

According to a sixth aspect of the present invention, a plurality of the disc springs are interposed between the two objects by superposing the large-diameter ends or the small-diameter ends thereof while abutting each other, and the deformation load reducing member is provided. It is characterized in that it is interposed between the ends of these disc springs. That is, even when the large-diameter ends or the small-diameter ends of a plurality of disc springs are overlapped while abutting each other to increase the vertical displacement stroke as a whole, a deformation load is applied between the ends of the disc springs. Since the reduction member is interposed, the disc spring in contact with the deformation load reduction member can be easily elastically deformed with a small load, and a vibration isolator with good responsiveness can be configured. In addition, by providing a portion where the deformation load reducing member is interposed and a portion where no deformation load reducing member is interposed between the disc springs, the elasticity of the disc spring that is easily elastically deformed and the disc spring that does not elastically deform until a predetermined load is input. By utilizing the difference in the characteristics, the desired vibration damping performance can be obtained as a whole of the vibration damping device depending on the ratio.

According to a seventh aspect of the present invention, there is provided a method of installing a vibration isolator, wherein the disk spring is interposed between two objects and an initial load is introduced, and the disk spring is interposed between the disk spring and those objects. A deformation load reducing member for causing elastic deformation of the disc spring with a vibration-proof load smaller than the static friction force; and a deformation load reducing member interposed between the deformation load reducing member and the disc spring. With the elastic deformation of the disc spring, And a support member for transmitting the displacement to the deformation load reducing member, wherein the disc spring is elastically deformed to prevent the propagation of vibration between the objects. It is characterized in that the support member is restrained and its displacement is hindered while allowing the initial deformation of the disc spring by introduction, and after the initial deformation of the disc spring, the constraint of the support member is released.

That is, when the vibration isolator is interposed between the objects and an initial load is introduced, the disc spring of the vibration isolator is initially deformed so that its end is displaced in the direction of increasing or decreasing the diameter. .
At this time, since the supporting member that comes into contact with the disc spring is restrained and its displacement is hindered, slippage occurs between the disc spring and the supporting member, and the initial deformation of the disc spring is absorbed, and the supporting member and the deformation are prevented. The load reducing member is not affected by the initial load. Therefore, after the support member is released from the constraint,
The original function of the deformation load reducing member is sufficiently exhibited, and the disc spring can be easily elastically deformed by the deformation load reducing member. That is, good responsiveness of the vibration isolator can be ensured.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a structural diagram showing a first embodiment in which a vibration isolator of the present invention is applied to a base isolation table, FIG. 2 is a detailed view of a portion A in FIG. 1, and FIG. FIG.

The vibration isolator 10 is interposed between two objects: a mounting table 12 located above and a base 14 located below. The vibration isolator 10 includes an annular rubber sheet 16 which is placed on a base 14 and is made of an elastic material, a plurality of steel plates 18 which are arranged on the rubber sheet 16 along the circumference thereof and form a support member, and And a disc spring 20 mounted on the steel plate 18. More specifically, the disc spring 2
In the reference numeral 0, the large-diameter end portion 20a is directed downward, and the small-diameter end portion 20b is disposed in contact with the lower surface of the mounting table 12.

On the other hand, on the upper surface of the base 14, the rubber sheet 16 on which the disc spring 20 is mounted is provided. The rubber sheet 16 has a predetermined width inside and outside the large-diameter end portion 20a when the disc spring 20 is mounted.

Further, the large-diameter end portion 20a of the disc spring 20
A plurality of steel plates 18 that are in surface contact with the rubber sheet 16 and are arranged at intervals in the circumferential direction of the disc spring 20 are interposed between the rubber plate 16 and the rubber sheet 16. The large-diameter end 20a of the disc spring 20 abuts near the center of the upper surface of the steel plate 18, and has sufficient rigidity so as not to be deformed by a load applied from above applied through the disc spring 20. Accordingly, the load input from the disc spring 20 to the rubber sheet 16 is not concentrated because it is dispersed by the steel plate 18 in surface contact with the rubber sheet 16, and the large-diameter end portion 20 a of the disc spring 20 bites into the rubber sheet 16. Absent.

That is, the disc spring 20 is mounted on the mounting table 12 described above.
And the weight of an exhibit or the like placed thereon is applied as an initial load, and is installed in an initial deformed state. Then, the vibration-proof target load input to the base 14 due to an earthquake or the like displaces the base 14 in the vertical direction and changes the load applied to the disc spring 20. In response to the change in the load, the disc spring 20 is elastically deformed so as to expand and contract the diameter of both ends.

At this time, since the small-diameter end 20b of the disc spring 20 is in direct contact with the lower surface of the mounting table 12, a static friction force acts between them, and the small-diameter end 20b also acts between the large-diameter end 20a and the steel plate 18. Static friction force works. On the other hand, since the rubber sheet 16 is interposed between the steel plate 18 and the base 14, the steel plate 18 can be displaced by its elasticity. Therefore, the disc spring 20 is formed by the elasticity of the rubber sheet 16.
The large-diameter end portion 20a is radially displaced and elastically deformed together with the plurality of steel plates 18 arranged in the circumferential direction.

That is, since the disc spring 20 can be elastically deformed without being affected by the static frictional force applied to its large diameter end portion 20a, the vibration damping device 10 can absorb even small vibrations, Vibration can be prevented with good response to the vibration. Then, the vibration isolator 10 can be easily formed only by interposing the rubber sheet 16 between the steel plate 18 and the base 14.

When a sheet-shaped viscoelastic material is interposed between the disc spring 20 and the base 14 instead of the rubber sheet 16, the viscoelastic material is Undergoes shear deformation, and the viscosity of the viscoelastic material can also absorb vibration energy. For this reason, in addition to the operation when the rubber sheet 16 is interposed, it is possible to obtain damping performance due to viscosity.

In the present embodiment, the rubber sheet 16 and the sheet-like viscoelastic material are annular, but the rubber sheet 16 and the sheet-like viscoelastic material are formed along the large-diameter end portion 20a similarly to the steel plate 18. It may be arranged.

Further, in this embodiment, the vibration isolator 10 using one disc spring 20 has been shown for convenience of explanation.
A plurality of units may be juxtaposed between the base 14 and the mounting table 12 with the disc spring 20, the steel plate 18, and the rubber sheet 16 as one unit.

FIGS. 4A and 4B are explanatory views showing an example of an installation jig used for installing the vibration isolator of the first embodiment and an installation method using the same, wherein FIG. 4A is a front view, and FIG. () Is a BB sectional view of (a).

The installation jig 30 has, for example, an annular shape surrounding each of the steel plates 18 from the outside, and is divided into two semicircular frames 30a in a diametrical direction. At each end of the frame 30a, a flange 30b is provided to protrude outward. The two frame bodies 30a are connected to their flange portions 30b.
The screws are made to face each other, and a screw is penetrated through each hole provided in the flange portion 30b and is fixed with a nut to form an annular shape.

The installation method of the vibration isolator 10 using the installation jig 30 is such that the installation jig 30 to which the two frames 30 a are fixed in an annular shape is attached to the rubber sheet placed on the base 14. 16 or viscoelastic material. This installation jig 3
A plurality of steel plates 18 are arranged on the rubber sheet 16 and the viscoelastic material inside 0. At this time, one end of each steel plate 18 is brought into contact with the inner peripheral surface of the installation jig 30 to restrain each steel plate 18 from being displaced in the radially expanding direction.

Then, the installation jig 3 is placed on the steel plate 18.
The disc spring 20 is arranged so that 0 and the large diameter end 20a are concentric. Finally, the mounting table 12 and the exhibits are mounted on them. At this time, an initial load is introduced to the disc spring 20, and the disc spring 20 is initially deformed. After that, installation jig 3
Remove the installation jig 30 by removing the 0 bolts and nuts,
The restraint of the steel plate 18 is released, and the installation of the vibration isolator 10 ends.

That is, when an initial load is applied to the disc spring 20, the static friction force acting between the large-diameter end portion 20a of the disc spring 20 and the steel plate 18 causes the steel plate 18 to be displaced in the radially expanding direction. The force to work works. On the other hand, each steel plate 18 is not displaced because it is restrained from the outside by the installation jig 30 so as not to be displaced in the radially expanding direction. Accordingly, the disc spring 20 slides between the large-diameter end portion 20a and the steel plate 18, and the initial deformation in the radially expanding direction is absorbed, so that the rubber sheet 16 is not affected by the initial load. In this state, the disc spring 2
The elastic force of 0 and the initial load due to the weight of the mounting table 12 and the like are balanced.

Therefore, the installation jig 30 is removed and the steel plate 1
8 is released, the original function of the rubber sheet 16 can be sufficiently exhibited.
Accordingly, the disc spring 20 can be easily elastically deformed without being restrained. Therefore, good responsiveness of the vibration isolator 10 can be ensured.

In the present embodiment, the installation jig 30 has been described as being restrained by surrounding the steel plate 18 from the outside, but the steel plates 18 are connected to each other by a detachable connecting member to form an integral ring. You may be constrained by things.

FIG. 5 is a block diagram showing a second embodiment of the present invention. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and redundant description will be omitted. In the vibration isolator according to the second embodiment, the disc spring 20 is mounted on a laminated rubber 32 which is arranged at a distance from each other along the circumferential direction.

According to this embodiment, the laminated rubber 32 is sheared by the force of the large diameter end 20a of the disc spring 20 deforming in the expanding and contracting direction, and the disc spring 20 can be easily elastically deformed. Furthermore, since the horizontal seismic isolation effect of the laminated rubber 32 can be obtained, a three-dimensional vibration isolation effect can be obtained.

FIG. 6 is a structural view showing a third embodiment of the present invention. In the vibration isolator of the third embodiment, two disc springs 20 are provided between the base 14 and the mounting table 12. The large-diameter end portions 20a are arranged one above the other with the large-diameter ends 20a interposed therebetween. This embodiment aims to increase the vertical displacement stroke as a whole by adding the elastic deformation capabilities of the disc springs 20.

The rubber sheet 16 is interposed between the large-diameter ends 20a, and the steel plate 18 is interposed between the large-diameter end 20a and the rubber sheet 16 to form a disc spring unit 34. . Further, the disc spring unit 34 is mounted on the rubber sheet 16 mounted on the base 14 via the steel plates 18 arranged at intervals along the circumferential direction. .

According to this embodiment, even when a large vertical displacement stroke is required, the same operation and effect as in the above embodiment can be obtained.

Further, the number of the disc springs 20 or disc spring units 34 to be superimposed is increased, and a portion where the rubber sheet 16 is interposed and a portion where the rubber sheet 16 is not interposed are provided between the disc springs 20 so that elastic deformation can be achieved. By utilizing the difference in elastic characteristics between the disc spring that is easy to perform and the disc spring that does not elastically deform until a predetermined load is input, it is possible to obtain a desired vibration damping performance as a whole of the vibration damping device.

In this embodiment, the deformation load reducing member interposed between the disc springs is a rubber sheet. However, if a sheet-like viscoelastic material is used, the vibration energy can be absorbed by the viscosity, so that the vibration damping effect due to the viscosity can also be obtained. Obtainable.

[0040]

As described above, in the vibration isolator according to the present invention, at least one of the disc springs and each of the objects has the deformation load reducing member interposed therebetween, so that there is a gap between the two objects. Even when the input load is small, the disc spring can be easily elastically deformed to prevent vibration.

Further, when the deformation load reducing member is made of an elastic material, a vibration isolator having good responsiveness to an input load can be easily formed only by providing an elastic material between the disc spring and the object. can do.

Further, when the deformation load reducing member is a viscoelastic material, in addition to the operation when the elastic material is interposed,
Damping performance due to viscosity can also be obtained.

Further, since the supporting member which comes into contact with the deformation load reducing member is interposed between the disk spring and the deformation load reducing member, the end of the disk spring does not bite into the deformation load reducing member.

When the laminated rubber is provided along the circumferential direction of the disc spring, the laminated rubber is sheared and deformed, so that the disc spring can be easily elastically deformed. Further, since the vibration damping effect of the laminated rubber in the direction orthogonal to the direction of displacement between the objects by the disc spring can be obtained, a three-dimensional vibration damping effect can be obtained.

Further, even when the large-diameter ends or the small-diameter ends are overlapped while abutting each other, the overall vibration stroke in the vertical direction can be increased, so that a vibration isolator with good responsiveness can be constructed. In addition, by providing a portion where the deformation load reducing member is interposed and a portion where no deformation load reducing member is interposed between the disc springs, it is possible to obtain a desired vibration damping performance as a whole of the vibration damping device by utilizing a difference in elastic characteristics. it can.

In the method of installing the vibration isolator according to the present invention, the restraint of the supporting member is released after the initial load is applied to the disc spring, so that the initial load does not affect the deformation load reducing member. . Therefore, after the restraint of the support member is released, the original function of the deformation load reducing member can be sufficiently exhibited, and good responsiveness of the vibration isolator can be secured.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a first embodiment in which a vibration isolator of the present invention is applied to a base isolation table.

FIG. 2 is a detailed view of a portion A in FIG.

FIG. 3 is a schematic plan view showing the arrangement and operation of the support member shown in FIG.

4A and 4B are explanatory views showing an installation jig and an installation method thereof, wherein FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line BB of FIG.

FIG. 5 is a structural diagram showing a second embodiment of the present invention.

FIG. 6 is a structural diagram showing a third embodiment of the present invention.

[Explanation of symbols]

 12 Mounting table (object) 14 Base (object) 16 Rubber sheet (elastic material, deformation load reducing member) 18 Steel plate (support member) 20 Disc spring 20a Large diameter end 20b Small diameter end 26a Disc spring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J048 AA01 BA08 BA11 BD05 BD08 BF05 DA03 EA13 3J059 AC02 AC03 BA23 BA43 BA63 BB03 BB09 BC07 BD01 BD05 BD09 DA16 GA41

Claims (7)

[Claims] An anti-vibration device interposed between two objects and prevented from propagating vibration between the two objects by a disc spring which receives a load exceeding a static frictional force between the two objects and starts elastically deforming. Between the disc spring and at least one of the objects,
An anti-vibration device comprising a deformation load reducing member that causes elastic deformation of a disc spring with a load smaller than the above load. 2. The vibration isolator according to claim 1, wherein the deformation load reducing member is made of an elastic material. 3. The vibration isolator according to claim 1, wherein the deformation load reducing member is made of a viscoelastic material. 4. A device provided between the disc spring and the deformation load reducing member so as to be displaceable along with the elastic deformation of the disc spring, so as to disperse a load input from the disc spring to the deformation load reducing member. The vibration isolator according to any one of claims 1 to 3, further comprising a support member that comes into contact with the deformation load reducing member. 5. The vibration isolator according to claim 1, wherein the deformation load reducing member is made of a laminated rubber provided along a circumferential direction of the disc spring. 6. The disk spring is interposed between the two objects by superimposing large-diameter ends or small-diameter ends thereof while abutting each other, and the deformation load reducing member is provided at an end of the disk spring. The anti-vibration device according to claim 1, wherein the anti-vibration device is interposed between any of the parts. 7. A disc spring interposed between two objects and to which an initial load is introduced, and the disc spring interposed between the disc spring and the objects and having a vibration-proof target load smaller than their static frictional force. A deformation load reducing member that causes elastic deformation of
Interposed between the deformation load reducing member and the disc spring,
A supporting member that is displaced with the elastic deformation of the disc spring and transmits the displacement to the deformation load reducing member, wherein the disc spring is elastically deformed to prevent the propagation of vibration between the objects. An installation method, wherein, while allowing initial deformation of the disc spring due to introduction of an initial load, the support member is restrained to prevent its displacement, and after the initial deformation of the disc spring, the constraint of the support member is released. Characteristic installation method of vibration isolator.