JP2002039244A - Coned disc spring unit with damping force regulating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coned disc spring with a damping force regulating function suppressing constraining forces exerted on each other of the stacked coned disc springs and provided with excellent responsiveness to an inputted load. SOLUTION: A coned disc spring unit 16 with a damping force regulating function consists of a plurality of coned disc springs 26a interposed between two structures 12 and 14 and stacked in the same direction. A cushioning layer 20 is interposed between the coned disc springs 26a. Further, a plurality of coned disc spring assemblies where a plurality of coned disc spring groups making a group in which the coned disc springs are pointed in the same direction is overlapped with each other such that the directions thereof are alternated is juxtaposed. The cushioning layer is interposed between at least two coned disc springs of the coned disc spring assemblies. The cushioning member is formed of a low friction material or a low friction member where surface processing is applied on the coned disc spring. Further, the cushioning member is formed of an elastic material 20 or a visco-elastic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc spring unit that is interposed between two structures and controls vibration propagation (transmission) between the two structures.

[0002]

2. Description of the Related Art Conventionally, a plurality of disk springs having the same shape and interposed between an upper structure and a lower structure are stacked with their inclined surfaces in contact with each other, or these disk springs are stacked. It consists of a disc spring assembly assembled by using a plurality of groups alternately, and supports the upper structure by the elastic force of the disc spring group and constitutes a vertical seismic isolation device that suppresses the propagation of vibration between the upper and lower structures. Disc spring units are known.

[0003] In the disc spring unit of this vertical seismic isolation device, the weight of the upper structure is added to the disc spring unit. When the load changes due to the displacement of the lower structure in the vertical direction due to an earthquake or the like, the inclination angle of each disc spring of the disc spring unit increases or decreases in response to the change in the load. The lower structure absorbs the relative displacement of the lower structure with respect to the upper structure, thereby reducing the vibration transmitted to the upper structure.

[0004]

However, in the above-mentioned conventional disk spring unit, the disk springs of the disk spring group constituting the unit are stacked so that their inclined surfaces are in contact with each other. Therefore, when each disc spring is elastically deformed due to the change in the load, one surface of the disc spring is compressed in the circumferential direction, the other surface is in tension, and their contact surfaces relatively move, At this time, a frictional force (damping force) corresponding to the surface treatment state of the disc spring is generated.

[0005] Therefore, when the force that deforms the disc spring due to the change in load is smaller than the maximum frictional force between the disc springs, the elastic deformation of the disc spring does not progress, and the disc spring is moved upward in a state harder than the original rigidity. Supports the structure.

That is, in the above-mentioned vertical seismic isolation structure, 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 springs, is input to the lower structure, the disc spring does not elastically deform. Therefore, the response of the short-period component is excited and the seismic isolation effect cannot be obtained.

In view of the foregoing, the present invention has been made in view of such a conventional problem, and suppresses a mutual restraining force acting between stacked disc springs, thereby providing a damping member which elastically deforms with good response to seismic force. It is an object to provide a disc spring unit with a force adjusting function.

[0008]

In order to achieve the above object, a disc spring unit with a damping force adjusting function according to the present invention comprises a plurality of disc springs which are interposed between two structural bodies and are superposed. In the spring unit, the disc springs are oriented in the same direction, and a buffer layer is interposed between the disc springs. That is, since the buffer layer is interposed between the disc springs, each disc spring does not directly contact the other disc spring. That is, when each disc spring is elastically deformed, between the disc springs, the binding force acting between them is reduced by the buffer layer. Therefore, each disc spring can be easily elastically deformed. Therefore, even when the load input between the two structures is small, the respective disc springs can be easily elastically deformed without being restricted by each other.

Further, in a disc spring unit constituted by a plurality of disc springs interposed between two structural bodies and overlapped with each other, a plurality of disc spring groups forming a group in which the disc springs are oriented in the same direction, A plurality of belleville spring assemblies superposed so that their directions are alternated are juxtaposed, and a buffer layer is interposed between at least one belleville spring of the belleville spring assemblies. . That is, by arranging a disc spring assembly composed of only a disc spring and a disc spring assembly composed of a disc spring and a buffer layer interposed therebetween, the disc spring assembly that is easily elastically deformed. By utilizing the difference in the damping performance between the disc spring assembly and the disc spring assembly which does not elastically deform until a predetermined load is input, the damping force acting as the whole disc spring unit can be set to a desired value depending on the ratio.

The buffer layer is formed of a low-friction member provided between the disc springs or a low-friction material surface-treated on the disc spring in order to suppress a frictional force generated between the disc springs. It is characterized by. That is, the buffer layer interposed between the disc springs is formed of a low-friction member or a low-friction material surface-treated on the disc spring. Friction is small. Therefore, each disc spring can be easily elastically deformed even if the load inputted between both structures is small. Further, when the force that deforms the disc spring increases with a change in load due to vibration or the like, the maximum frictional force between each disc spring and the low-friction member or low-friction material is small. When the force for deforming the spring is relatively small, the disc spring is elastically deformed. That is, since the maximum frictional force is small, each of the disc springs is not suddenly elastically deformed, and it is possible to suppress the generation of the response of the short-period component between the two structures.

Further, the buffer layer is made of an elastic material which is elastically deformed by the deformation of the disc spring. That is, due to the elastic material interposed between the respective disc springs, no mutual restraining force acts between the respective disc springs. Therefore, even when the load input between the two structures is small, each disc spring is elastically deformed, and the disc spring unit with the damping force adjusting function has good responsiveness to the input load (seismic force). The property can control the propagation of vibration between the two structures. In addition, the effect of the frictional force between the disc springs is small due to the interposition of the elastic material, and the disc spring unit with the damping force adjustment function has a stable property because it is not affected by the surface state of the disc spring and the elastic material. it can.

Further, the buffer layer is made of a viscoelastic material which is viscoelastically deformed by deformation of the disc spring.
That is, since the viscoelastic material is interposed between the respective disc springs, the mutual restraining force does not act between the respective disc springs, and the respective disc springs are elastically deformed even if a small load is input between the two structures. be able to. Therefore, the disc spring unit with the damping force adjustment function can control the propagation of vibration between the two structures with good responsiveness to the input load (seismic force). Further, the viscoelastic material is sheared by the elastic deformation of each disc spring due to vibration or the like, and the vibration energy is also absorbed by the viscosity of the viscoelastic material. In addition, damping performance due to viscosity can be obtained.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a structural view showing a first embodiment of a basic vertical seismic isolation device to which a disc spring unit with a damping force adjusting function of the present invention is applied.

The vertical seismic isolation device 10 is interposed between two structures, a building 12 located above and a foundation 14 located below it. In the vertical seismic isolation device 10, a plurality of disc springs 26a are stacked in the same direction and stacked, and a rubber sheet 20 of a polymer compound serving as a buffer layer is interposed between the respective disc springs 26a to adjust the damping force. Disc spring laminate 26 constituting disc spring unit 16 with function
And metal supporting legs 28 for supporting the disc spring laminated body 26 on the foundation 14.

The disk spring 2 constituting the disk spring laminated body 26
As is generally known, 6a has a donut shape having an opening formed in the center, and its peripheral surface is formed in a hatched shape having an inclined surface as a whole and having a central opening.

A rubber sheet 20 having substantially the same shape as the disc spring 26a is interposed between the disc springs 26a so that the disc springs 26a do not contact each other.
And the rubber sheet 20 are alternately arranged so that the disc spring laminate 2
6 is formed and is placed on a seat 28 a of a support leg 28 installed on the foundation 14. A leg 28b erected at the center of the seat 28a is inserted into the center opening between the disc spring 26a and the rubber sheet 20, and the disc spring 26a of the disc spring laminate 26 and the rubber sheet 20 The laminated state is maintained. At this time, the rubber sheet 20 is
Even if it is adhered to 6a, it may be simply sandwiched.

The disc spring laminate 26 is used for the building 1
A predetermined load is input by the weight of the building 12 in a state where the building 12 is interposed between the base 2 and the seat 28a of the support leg 28, and the building 12 is elastically deformable. In other words, this vertical seismic isolation device 10 has a vibration
4, the force in the compression direction is applied to the disc spring 26a of the disc spring laminated body 26, and the disc spring 26a is deformed so that the angle formed by the cap-shaped inclined surface becomes small, and the disc spring 26a rebounds. Deformation to increase the angle. Due to the elastic deformation of the disc spring 26a, the vertical vibration of the building 12 is isolated.

At this time, since the rubber sheet 20 is interposed between the disc springs 26a, the inclined surfaces of the disc springs 26a do not directly contact each other. That is, the inclined surfaces of the disc springs 26a located above and below are in contact with the rubber sheet 20, respectively, and the disc spring laminate 26 is compressed and the disc springs 26a
Is deformed, the rubber sheet 20 interposed therebetween is also elastically deformed to follow, so that the disc spring 2
The relative movement between the disc springs 26a due to the deformation of 6a is not restricted by the frictional force, and the disc springs 26a can be elastically deformed smoothly, and the vibration of the building 12 with respect to the foundation 14 can be controlled. Therefore, even when the vibration input to the foundation 14 is small, each disc spring 26a can be elastically deformed, and a seismic isolation effect with good responsiveness to the input vibration can be obtained.

Since the disc springs 26a are not in contact with each other, when the disc springs 26a are elastically deformed, the
No frictional force interacting between 6a is generated. Therefore,
A stable seismic isolation effect can be obtained without depending on the surface state or the like of the disc spring 26a.

Also, when a sheet-like viscoelastic material is interposed between the disc springs 26a instead of the rubber sheet 20, the elasticity of the viscoelastic material restrains the disc springs between the disc springs. Even if a small force is applied between the building 12 and the foundation 14 without applying force, each disc spring is elastically deformed, and the disc spring unit 16 with the damping force adjusting function receives the input load (seismic force). Vibration propagation between both structures can be controlled with good responsiveness. In addition, each disc spring 2
When the viscoelasticity is sheared with the elastic deformation of 6a,
Since the vibration energy is absorbed by the viscosity of the viscoelastic material, a damping effect due to the viscosity can be obtained.

In the present embodiment, the disc spring laminate 26
Although the rubber sheet 20 and the viscoelastic material are interposed as buffer layers between the respective disc springs 26a, the shape of the rubber or the like forming the buffer layer is not limited to the sheet shape.

FIG. 2 is a structural view showing a modification of the first embodiment. Here, the overall schematic configuration of this modified example is substantially the same as the configuration of FIG. 1 shown in the above-described first embodiment. I will explain only. As shown in FIG. 2, this modification basically differs from the first embodiment in that the buffer layer interposed between the disc springs of the vertical seismic isolation device is made of a low friction member.

In this embodiment, the disc spring 2 is used as a buffer layer.
A Teflon plate 20a coated with Teflon (registered trademark) having a low friction coefficient is interposed on a plate material different from 6a. In the vertical seismic isolation device 10 having this configuration, the disc spring 26a
Since the Teflon plate 20a is interposed between each other,
The maximum frictional force acting between each disc spring 26a and the Teflon plate 20a is small. Therefore, each disc spring 26a can be easily elastically deformed even if a small vibration is input to the foundation 14, so that the building 12 can be isolated.

Also, when the force for deforming the disc spring 26a increases with the change in load due to vibration,
Since the maximum frictional force between each disc spring and the Teflon plate 20a is small, the disc spring 26a elastically deforms at a stage where the force for deforming the disc spring 26a is relatively small. That is, since the maximum frictional force is small, each of the disc springs 26a is not suddenly elastically deformed, and the generation of the vibration of the short-period component on the building 12 can be suppressed.

In the above embodiment, the Teflon plate 20a is used as the low-friction member. However, the invention is not limited to this, and a disc spring having a coating specification in which Teflon as a low-friction material is directly sprayed and painted on the disc spring may be used.

FIG. 3 is a structural view showing another modification of the first embodiment. This modification is the same as the disc spring laminate 26 used in the first embodiment, that is, the disc spring laminate 26 in which the rubber sheet 20 is interposed between the disc springs 26a, and the disc spring group 30 in which disc springs are simply overlapped. And the building 12 and the foundation 14
May be interposed between. At this time, for example, two disc spring laminates 26 and two disc spring groups 30 are used, the disc spring laminates 26 and the disc spring groups 30 are alternately arranged, and their cap-shaped upper ends are pressed against each other. The disc spring unit 16 with the damping force adjusting function is formed by being in contact with and being arranged in series.

In the vertical seismic isolation device 10 having this configuration, the coned disc springs 30 and the coned disc springs 26
By combining the disc spring laminate 26 with the rubber sheet 20 interposed therebetween, the damping performance of the disc spring laminate 26 that is easily elastically deformed and the disc spring group 30 that does not elastically deform until a predetermined load is input. By utilizing the difference in the above, the damping force acting on the disc spring unit 16 with the damping force adjusting function as a whole can be set to a desired value.

When a sheet-shaped viscoelastic material is interposed between the disc springs 26a in place of the rubber sheet 20, the elasticity of the viscoelastic material restrains the disc springs from each other. Even if a small force is applied between the building 12 and the foundation 14 without applying force, each disc spring is elastically deformed, and the disc spring unit with the damping force adjusting function has good response to the inputted load (seismic force). Vibration propagation between the two structures can be controlled. In addition, when the viscoelasticity is sheared by the elastic deformation of each disc spring 26a, the vibration energy is absorbed by the viscosity of the viscoelastic material, so that the damping effect due to the viscosity can be obtained.

At this time, the buffer layer interposed between the disc springs is not limited to the rubber sheet 20 or the viscoelastic material, but may be the Teflon plate 20a or the like. In addition, the number of the disc spring laminates 26 and the disc spring groups 30 constituting the disc spring unit 16 with the damping force adjusting function and the ratio of combining them are not limited to this, and the buffer to be interposed in each disc spring laminate 26 is not limited thereto. The type of layer is not limited to one. Therefore, the desired damping force can be easily set by changing the number and ratio of the disc spring laminate 26 and the disc spring group 30 constituting the disc spring unit 16 with the damping force adjusting function, and the interposed buffer layers and their types. can do.

FIG. 4 is a structural view showing a second embodiment in which the disc spring unit 16 with a damping force adjusting function of the present invention is applied to a vertical seismic isolation device. As shown in FIG.
A plurality of disc spring assemblies 32 in which a plurality of disc spring groups 30 in which 6a are superimposed are superimposed so that their vertical directions are alternated are arranged between the building 12 and the foundation 14,
Between each of the disc springs 26a of at least one of the disc spring assemblies 32, a rubber sheet 20 is provided.
Is shown.

That is, the rubber sheet 20 is placed between each disc spring 26a.
The disc spring assembly 32a is formed by alternately arranging the plurality of disc spring laminates 26 in the directions. Each disc spring 26a is easily elastically deformed, and a rubber sheet is provided between the disc springs 26a. The disc spring assembly 32 in which is not interposed is
It does not elastically deform until a predetermined load is input. That is, these disc spring assemblies 32, 32a are
, The entirety of all the disc spring assemblies 32, 32a arranged side by side act as one disc spring unit 16. Therefore, utilizing the difference in the damping performance between the disc spring assembly 32a that is easily elastically deformed and the disc spring assembly 32 that is not elastically deformed until a predetermined load is input, the disc spring unit 16 with the damping force adjustment function is used as a whole. Can be set to a desired value.

For example, in the case where six disc spring assemblies are juxtaposed between a building and a foundation, if a buffer layer is interposed between all the disc springs in only two of them,
The damping force can be reduced to about 2/3 of the case where six disc spring assemblies without a buffer layer are arranged side by side.

When a sheet-shaped viscoelastic material is interposed between the disc springs 26a in place of the rubber sheet 20, the elasticity of the viscoelastic material restrains the disc springs between the disc springs. Even if a small force is applied between the building 12 and the foundation 14 without applying force, each disc spring is elastically deformed, and the disc spring unit with the damping force adjusting function has good response to the inputted load (seismic force). Vibration propagation between the two structures can be controlled. In addition, when the viscoelasticity is sheared by the elastic deformation of each disc spring 26a, the vibration energy is absorbed by the viscosity of the viscoelastic material, so that the damping effect due to the viscosity can be obtained. At this time, the buffer layer interposed between the disc springs is not limited to the rubber sheet 20 or the viscoelastic material, but may be the Teflon plate 20a or the like.

A disc spring unit 1 with a damping force adjusting function
The number of disc spring assemblies with a buffer layer interposed and the disc spring assemblies with no buffer layer constituting 6 and the combination ratio thereof are not limited to this, and the type of the buffer layer to be interposed is also one. Not limited to type. Therefore, it is easy to change the number and ratio of the disc spring assembly having the buffer layer interposed and the disc spring assembly having no buffer layer constituting the disc spring unit, and the buffer layer and the type thereof to be interposed. The desired damping force can be set.

[0035]

As described above, in the disc spring unit with the damping force adjusting function of the present invention, the buffer layer is interposed between the disc springs, so that the restraining force acting between the disc springs is established. Is reduced and the input load is small,
Each disc spring is elastically deformed without being restrained from each other, and can control vibration between both structures.

Further, by disposing a disc spring assembly composed of only a disc spring and a disc spring assembly composed of a disc spring and a buffer layer interposed therebetween, each disc spring assembly is provided. By utilizing the difference in the damping performance of the above, the disc spring unit with the damping force adjusting function can be set to a desired damping force as a whole.

When the buffer layer interposed between the disc springs is formed of a low-friction member or a low-friction material surface-treated on the disc spring, the buffer layer acts between the disc spring and the low-friction member or the low-friction material. Since the maximum frictional force is small, it can be easily elastically deformed even when the load input between both interposed structures is small, and it has good responsiveness to the input load. Can be.

When the cushioning member interposed between the disc springs is made of an elastic material, the elasticity allows the disc spring unit with the damping force adjusting function to respond to an input load (seismic force). It has good properties and can control vibration propagation between both structures.

Further, the damping force (frictional force) between the disc springs can be eliminated in any surface condition of the disc springs by the buffer layer interposed between the disc springs.

When a viscoelastic member is interposed between the disc springs, a damping effect due to viscosity can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a first embodiment in which a disc spring unit with a damping force adjusting function of the present invention is applied to a vertical seismic isolation device.

FIG. 2 is a structural diagram showing a modification of FIG.

FIG. 3 is a structural diagram showing another modification of FIG. 1;

FIG. 4 is a structural view showing a second embodiment in which the disc spring unit with a damping force adjusting function of the present invention is applied to a vertical seismic isolation device.

[Explanation of symbols]

 12 Building (structure) 14 Foundation (structure) 16, 26 Disc spring unit with damping force adjustment function 20 Rubber sheet (elastic material, buffer layer) 26a Disc spring

Continued on the front page (72) Inventor Hiroyuki Tsumura 2-15-2 Konan, Minato-ku, Tokyo Obayashi Gumi Tokyo Head Office (72) Inventor Takahiro Somagi 2-15-2 Konan, Minato-ku, Tokyo Obayashi Gumi Tokyo Co., Ltd. Head office (72) Inventor Mitsuru Kageyama 4-640 Shimoseito, Kiyose-shi, Tokyo F-term in Obayashi Corporation Technical Research Institute Co., Ltd. 3J048 AA01 BA24 BC05 BD04 BD08 EA07 3J059 AA10 BA23 BB03 BB09 BC12 DA50 GA50

Claims (5)

[Claims] 1. A disc spring unit comprising a plurality of disc springs interposed between two structural bodies and superposed, wherein the disc springs are oriented in the same direction, and a buffer layer is provided between the disc springs. Disc spring unit with damping force adjustment function, characterized by interposing 2. A disc spring unit comprising a plurality of disc springs interposed between two structural bodies and superposed, wherein a plurality of disc spring groups, each of which is a group of said disc springs being oriented in the same direction, A plurality of belleville spring assemblies superposed so that their directions are alternated are juxtaposed, and a buffer layer is interposed between at least one belleville spring of the belleville spring assemblies. Disc spring unit with damping force adjustment function. 3. The buffer layer is formed of a low-friction member provided between the disc springs or a low-friction material surface-treated on the disc springs in order to suppress a frictional force generated between the disc springs. The disc spring unit with a damping force adjusting function according to claim 1 or 2, wherein: 4. The disc spring unit with a damping force adjusting function according to claim 1, wherein the buffer layer is made of an elastic material that is elastically deformed by deformation of the disc spring. 5. The disc spring unit with a damping force adjusting function according to claim 1, wherein the buffer layer is made of a viscoelastic material that is viscoelastically deformed by deformation of the disc spring.