JPH11173377A - Buffer body of damping device and laminated buffer body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the nonlinear property of a buffer body of a damping device without complicating a configuration thereof and changing a material and blending of an elastic body itself and suppress vibration effectively over a wide scope from small vibration to large vibration. SOLUTION: Upper and lower plates 22, 22a are opposingly arranged at a predetermined interval, and a rubber body 24a formed like a circular column is provided at four corners of these upper and lower plates 22, 22a. The rubber body 24a is fixed on these upper and lower plates 22, 22a by vulcanization bonding in a condition in which an upper end part is initially deformed by a predetermined amount 8 so that elastic forces are cancelled mutually toward the central direction of the upper and lower plates 22, 22a. By setting the initial deformation of the rubber body 24a toward different directions, a peak of the relation between rigidity and deformation is not concentrated at a neutral point as the whole buffer body and is deviated and dispersed to the surroundings so that a peak of spring rigidity is lowered and smoothed and a resonance region can be expanded by the amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber and a laminated shock absorber used in a vibration damping device for damping an object to be damped.

[0002]

2. Description of the Related Art In recent years, in middle and high-rise buildings, as a vibration damping device for suppressing oscillation due to external vibrations such as earthquakes and strong winds,
For example, JP-A-9-189144 (Int. Cl. E04H 9 /
02) Tuned mass damper (TMD)
Has been put to practical use. In this TMD, a mass body is attached to the outside of a building (on the roof) via a buffer, and the spring rigidity of the buffer is tuned in advance so that the resonance period of the mass body matches the natural period of the building. In addition, the vibration of the building caused by the external force is absorbed by the vibration of the mass body and attenuated.

Here, an isolator made of laminated rubber in which a steel plate and a rubber body serving as an elastic body are alternately laminated is generally used as the buffer.

[0004]

Meanwhile, as shown by a broken line A1 in the spring characteristic graph of FIG. 13A, the shock absorber used in such a vibration damping device has a spring rigidity with respect to the deformation amount. It is desirable that the load-deformation characteristics that do not change exhibit linearity. That is, when an object having a mass m is supported on a vibrator via a buffer having a spring rigidity k so as to be able to vibrate in the horizontal direction, the natural period T of the mass is T = 2π (m / k) ^1/2 ... If the spring stiffness k is constant, a broken line B1 is shown in the graph of the deformation amount-period characteristic in FIG. 10B regardless of the deformation amount (that is, the magnitude of the horizontal external force).
The natural period T becomes constant as shown by, and an ideal vibration damping action can be exhibited by tuning from the large vibration to the small vibration to the natural vibration of the building.

However, in the conventional laminated rubber used as the shock absorber, as shown by the solid line A in the graph of FIG. 13A, a nonlinear load in which the spring stiffness changes in accordance with the magnitude of the load (external vibration force). -Has a deformation characteristic (spring stiffness characteristic), and correspondingly, the natural period changes according to the magnitude of the deformation as shown by the solid line B in the graph of FIG. Has characteristics.

Accordingly, in the conventional laminated rubber, the spring stiffness thereof is a certain value relative to the ideal linear stiffness characteristic A1.
Matching can be made only at the point. For example, if tuning is performed so as to match at the point P, the mass body resonates only in the region X having a very small deformation width near the point P. That is,
In a conventional vibration damping device using laminated rubber, the resonance period of the mass body cannot be tuned to the natural period of the building over a wide deformation region from large amplitude to small amplitude, and the amplitude region that can be tuned to the building is extremely small. It will be within a narrow setting range. For example, when tuning is performed so as to be suitable for a normal small and medium earthquake and the range X is set, there is a problem that the vibration damping effect is significantly reduced during an earthquake larger than that. In addition,
Although this problem is remarkable in the case of a laminated rubber, the same problem exists in an elastic body such as a coil spring.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to control vibrations in a wide deformation region from a small amplitude to a large amplitude effectively. An object of the present invention is to provide a shock absorber and a laminated shock absorber for a vibration device.

[0008]

Means for Solving the Problems In order to achieve the above object, the structures of the shock absorber and the laminated shock absorber of the vibration damping device of the present invention are shown in each claim.

(1) The shock absorber according to the first aspect of the present invention has upper and lower plates which are vertically opposed to each other at a predetermined interval, and a plurality of elastic members which are fixed in parallel between the upper and lower plates and allow relative displacement in the horizontal direction. The elastic body is characterized in that at least two or more of the elastic bodies are given an initial deformation that cancels the elastic force of the horizontal component mutually.

(2) The cushioning member of the second aspect is the first aspect.
Wherein the two elastic members are arranged symmetrically in the horizontal direction of the upper and lower plates.

(3) The buffer according to claim 3 is the above-mentioned claim 1.
Or 2) wherein the elastic body is a rubber body.

(4) A laminated buffer according to a fourth aspect of the present invention includes the buffer according to the third aspect as a minimum unit element, and the minimum unit element of the buffer is laminated in a plurality of layers in the vertical direction. It is characterized by.

(5) The shock absorber of claim 5 is the above-mentioned claim 3.
As the first minimum unit element,
A buffer body in which a plurality of elastic bodies made of rubber bodies are fixed between the upper and lower plates without giving horizontal initial deformation is used as a second minimum unit element, and these first minimum unit element and second minimum unit are used. It is characterized by being formed by alternately laminating unit elements in appropriate numbers.

The operation of the shock absorber of the vibration damping device according to the present invention having the above structure will be described below for each claim.

(1) In the first aspect, at least two or more of the plurality of elastic bodies fixed and arranged in parallel between the upper and lower plates are provided with an initial deformation which cancels the elastic force of the horizontal component mutually. , The spring stiffness of the shock absorber formed by combining these plurality of elastic bodies is obtained as a combination of the spring stiffnesses of the individual elastic bodies. In other words, the spring stiffness characteristics (load-deformation characteristics) of the shock absorbers correspond to the number of elastic bodies to which the initial deformation has been given, and the stiffness at a position corresponding to their initial deformation direction and size in the horizontal plane. The peaks are dispersed and present. For this reason, the conventional shock absorber has a spring rigidity characteristic in which a plurality of elastic bodies are juxtaposed and fixed without giving initial deformation, and the peaks of the rigidities of all the elastic bodies are additively concentrated at the neutral point. Compared with the body, the shock absorber according to the present invention has a spring rigidity characteristic in which the peak value of the rigidity is overwhelmingly low and the amount of change in the spring rigidity is small over a wide range in the horizontal plane.
Therefore, it is possible to tune a wide range of vibrations from a small amplitude to a large amplitude with respect to a vibration having a desired natural period that is desired to be tuned by the vibration damping device. I can do it.

(2) According to the second aspect, the number of elastic bodies provided between the upper and lower plates is set to a minimum of two, and the initial deformation is given symmetrically in the horizontal direction. On the other hand, it is possible to obtain a small-sized buffer body in which the amplitude range in which the vibration can be suppressed is enlarged as much as possible.

(3) According to the third aspect, since the elastic body is made of a rubber body, the diameter (flat cross-sectional area) of the plurality of rubber bodies fixed in parallel between the upper and lower plates when setting the spring rigidity characteristics.
By changing the number of rubber bodies, including changing the thickness and thickness, and adding rubber bodies that do not give initial deformation, the non-linearity of the buffer body does not change without changing the material or composition of the rubber body itself Can be arbitrarily improved.

(4) According to a fourth aspect of the present invention, the shock absorber of the third aspect is used as a minimum unit element to constitute a shock absorber alone, and the shock absorbers are stacked in a plurality of stages in the vertical direction. As the amount of displacement increases, the overall spring stiffness of each rubber body is arranged in series, so the overall spring stiffness can be varied. Even so, adjustment for making the resonance period coincide with the natural period of the object to be damped can be easily performed.

(5) In the fifth aspect, a single buffer having the rubber body subjected to the initial deformation is defined as the first minimum element unit, and a single buffer body having no initial deformation applied to the rubber body is defined as the second minimum element. As a unit, the first minimum element unit and the second minimum element unit are formed by laminating an appropriate number of them alternately.
It is possible to arbitrarily adjust the overall spring constant when each of the shock absorbers is laminated in multiple layers in consideration of the shock absorber with initial deformation applied to the rubber body and the shock absorber without initial deformation. As a result, the resonance period can be tuned with high accuracy.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 9 show a preferred embodiment of a shock absorber and a laminated shock absorber of a vibration damping device according to the present invention. FIG. 1 is a front view of a vibration damping device using a laminated shock absorber, and FIG. FIG. 3 is a cross-sectional view showing one of the buffer units as a minimum unit element constituting the laminated buffer, FIG. 4 is a plan view of the buffer unit alone, and FIG. 5 is a plurality of the buffer units laminated. FIG. 6 is a stiffness-deformation characteristic diagram of a single buffer member, FIG. 7 is a load-deformation characteristic diagram of the laminated buffer member, and FIG. 8 is a cycle-deformation characteristic diagram of the laminated buffer member. It is.

That is, as shown in FIG. 1, an example is shown in which the vibration damping device 12 to which the laminated buffer body 10 of the present embodiment is applied is configured as a TMD. It is installed on the roof of the building 14 that is the object. The vibration damping device 12 is roughly constituted by the laminated buffer body 10 and a mass body 16 attached to the upper end of the laminated buffer body 10. The vibration of the mass body 16 is interposed between the mass body 16 and the building 14. A damper 18 for damping is attached.

When a vibration such as an earthquake is input to the building 14, the vibration of the building 14 is transmitted from the rooftop to the mass 16 via the buffer 10 with a delay, and the vibration of the mass 16 is further transmitted. Conversely, a phase difference of a half wavelength is generated while being delayed and transmitted to the building 14 via the buffer 10, so that the vibration of the building 14 is canceled by the vibration of the mass body 16. For this reason, the spring rigidity of the laminated buffer 10 is determined so that the resonance period of the mass body 16 matches the natural period of the building 14.

The mass body 16 is formed in a rectangular shape as shown in FIG. 2, and the laminated buffer bodies 10 are respectively arranged at four corners. The laminated buffer 10 is configured by laminating a plurality of buffer units 20 of the minimum unit shown in FIGS. 3 and 4 as shown in FIG. This buffer body 20 is
Upper and lower plates 22, 22 which are vertically opposed to each other with a predetermined interval.
a, and a plurality of elastic bodies 24 fixed side by side between the upper and lower plates 22, 22a. At least two or more of the plurality of elastic bodies 24 cancel each other out of the horizontal elastic force. An initial deformation amount in the horizontal direction is given.

More specifically, each of the elastic members 24 is formed of a rubber member 24a formed in a short cylindrical shape, and the upper and lower plates 22, 22a are formed in a rectangular shape and arranged horizontally. Four rubber bodies 24a are arranged at four corners of the upper and lower plates 22, 22a. These rubber bodies 24a
In a state where the upper end portion is initially deformed by a predetermined amount δ toward the center O of the upper and lower plates 22, 22a, the upper and lower plates 2
2, 22a are fixed by vulcanization bonding or the like, and the initial deformation amount δ is set to be equal so that the inclination angles of the respective rubber bodies 24a are symmetrical.

Here, when a plurality of the buffer bodies 20 are laminated, the buffer bodies 20 which are vertically adjacent to each other are:
The lower plate 22a of the upper buffer unit 20 and the upper plate 22 of the lower buffer unit 20 are shared.

Therefore, in the vibration damping device 12 using the laminated buffer 10 of the present embodiment, the building 14 vibrates due to an earthquake, a strong wind, or the like, and this vibration is transmitted to the mass body 16 via the laminated buffer 10. And when transmitted from the mass body 16 to the building 14, each of the buffer bodies 2 constituting the laminated buffer body 10
0 causes horizontal load fluctuation. At this time, since the buffer body 20 is given initial deformation in the horizontal direction in different directions so as to mutually cancel the elastic force to the rubber members 24a, the upper plate 22 and the lower plate 22 are caused by the load fluctuation. When a relative displacement occurs with the plate 22a, the individual elastic members 24a
Of the rubber members 24a, resulting in differences in the rigidity of the individual rubber bodies 24a.

That is, in the present embodiment, each of the rubber members 24
Since a is initially deformed toward the center of the upper plate 22 so as to negate each other's elastic force, each of the rubber members 2
As shown in FIG. 4, each neutral point 4 a is radially dispersed at four positions on the diagonal line of the upper plate 22 with respect to the center of the buffer body 20. When the relative displacement occurs between the upper plate 22 and the lower plate 22a due to the action, the rigidity of each rubber body 24a individually depends on the distance from the displacement position to the neutral point (that is, the deformation amount). .

This will be described with reference to a spring rigidity characteristic graph of the relationship between rigidity and deformation amount, as shown in FIG. In the graph of FIG. 6, two rubber bodies 24a whose initial deformations are symmetrically provided on one diagonal line are shown for convenience of explanation, and two rubber bodies arranged on the other diagonal line are omitted. doing. The deformation direction is a direction along a diagonal line. In the graph of FIG. 7, the central axis O indicates the neutral point of the buffer body 20 in the neutral state in which the upper plate 22 and the lower plate 22a are in a balanced state as a whole and the relative displacement does not occur between the upper plate 22 and the lower plate 22a. Shows the respective spring stiffness characteristics of the two rubber bodies fixed in parallel by giving the initial deformation in the opposite direction between the upper and lower plates 22, 22a. As shown in the figure, the spring rigidity characteristics C and D of the two rubber bodies have the same amount in the opposite direction with respect to the center axis O (initial deformation amount).
The only difference is that they are shifted
The properties of the rubber itself are exactly the same.

The spring stiffness characteristic of the stiffness-deformation relationship obtained as a whole of the buffer body 20 is obtained as a characteristic E obtained by combining the characteristics C and D of the rubber body 24a. That is, the combined characteristic E is flattened as a whole, and the amount of change in rigidity with respect to the amount of deformation can be reduced over a wide range. FIG. 9 shows the rigidity obtained by a conventional normal shock absorber having no initial deformation applied to the rubber body (having the same configuration as a normal shock absorber 30 described later) for comparison with FIG. The characteristic F of the deformation relationship is shown, a high peak is shown at the neutral point 0, and the rigidity is rapidly reduced as the peak is displaced from this peak. Therefore, it is understood that the tuning range can be significantly expanded in the buffer body 20 of the present embodiment as compared with the conventional normal buffer body alone.

Also, in the present embodiment, actually, four rubber bodies 24a are provided for each buffer body 20 and each is initially deformed point-symmetrically toward the center of the upper plate 22. The graph of the change in rigidity of the two rubber bodies arranged on the other diagonal line with respect to the deformation amount along the diagonal line is completely the same as the graph of FIG.
In addition, the horizontal axis indicating the deformation amount passes through the central axis on the graph of FIG.

That is, the spring stiffness characteristic (load-deformation characteristic) of the buffer body 20 is determined by the initial deformation 4
In accordance with the number of the elastic bodies 24a, the rigidity peaks appear in two diagonal lines in a horizontal plane, corresponding to their initial deformation directions and magnitudes.
For this reason, the conventional shock absorber has a spring rigidity characteristic in which a plurality of elastic bodies are juxtaposed and fixed without giving initial deformation, and the peaks of the rigidities of all the elastic bodies are additively concentrated at the neutral point. Compared with the body, the shock absorber according to the present invention has a spring rigidity characteristic in which the peak value of the rigidity is overwhelmingly low and the amount of change in the spring rigidity is small over a wide range in the horizontal plane. Therefore, it is possible to tune a wide range of vibrations from a small amplitude to a large amplitude with respect to a vibration having a desired natural period that is desired to be tuned by the vibration damping device. I can do it.

Further, as shown in FIG. 5, in the case of the laminated shock absorber 10 in which a plurality of the shock absorbers 20 are stacked, the overall spring stiffness K at this time is k 1, the spring stiffness of each shock absorber 20. , K2, k3..., 1 / K = (1 / k1)
+ (1 / k2) + (1 / k3)..., And the overall spring stiffness K can be varied. In this case, the load-deformation relationship has a characteristic G as shown by a solid line in FIG. The characteristic H as shown by the solid line in FIG. Further, by varying the spring stiffness by lamination, even when the rigidity of the rubber body 24a is large, it is possible to easily adjust the resonance period of the vibration damping device 12 to match the natural period of the building 14. it can.

That is, in the load-deformation relationship shown in FIG. 7, the characteristic G of the present embodiment shown by the solid line is compared with the conventional characteristic A shown by the broken line, Linear characteristic A1 can be approximated. Also,
In the cycle-deformation relationship shown in FIG. 8, the characteristic H of the present embodiment shown by the solid line is different from the conventional characteristic B shown by the broken line in the ideal cycle characteristic B1 shown by the one-dot chain line in FIG. Can be brought closer. Therefore, in this embodiment, since the characteristics of the load-deformation and the cycle-deformation can be made closer to the theoretical values, the vibration cycle of the mass body 16 of the vibration damping device 12 can be changed over a wide range. Therefore, even when the building 14 vibrates greatly due to an excessive earthquake or strong wind, the vibration damping device 12
Function can be fully exhibited, and the vibration suppression of the building 14 can be effectively suppressed.

In setting the spring stiffness characteristic of the shock absorber alone, the plurality of rubber bodies fixed in parallel between the upper and lower plates 22 and 22a do not necessarily need to have exactly the same shape. By changing the number of rubber bodies, including changing the area and thickness, and adding a rubber body that does not cause initial deformation, the cushioning body can be changed without changing the material and composition of the rubber body 24a itself. Can be arbitrarily improved.

In this embodiment, the initial deformation direction of the rubber body 24a is such that the upper side is closer to the center O, so that the stability can be ensured. The initial deformation may be given so that the lower side approaches the center O.

FIGS. 10 to 12 show modified embodiments of the laminated buffer, FIG. 10 is a front view, FIG. 11 is a characteristic diagram of a load-deformation relationship, and FIG. 12 is a characteristic diagram of a cycle-deformation relationship.
In the modified embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

That is, in the laminated buffer 10a in this modified embodiment, as shown in FIG. 10, the buffer body 20 shown in the above embodiment is used as the first minimum element unit, while the rubber body is given an initial deformation. No normal buffer 30 alone
As a minimum element unit, the buffer body 20 of the above embodiment is appropriately interposed between the laminated portions of the normal buffer body 30. That is, the normal buffer body 30
The rubber body 24a is in a natural state and the upper and lower plates 2
2, 22a are vulcanized and adhered.

In the present embodiment, the buffer body 10a is formed by alternately stacking the above-described buffer body 20 and the normal buffer body 30 in which the rubber body is given an initial deformation in the vertical direction. You. Also in this embodiment, the eccentric shock absorber 20 and the normal shock absorber 30 that are vertically adjacent to each other share the lower plate 22a disposed above and the upper plate 22 disposed below. You.

Therefore, the laminated buffer 10a of this embodiment
In this example, the buffer body 20 and the normal buffer body 30 were alternately stacked, so that the buffer body 20 and the normal buffer body 3
The overall spring constant when each of the buffer bodies 20 and 30 is multilayered can be arbitrarily adjusted in consideration of 0, and the resonance natural period can be tuned with high accuracy. The characteristic I of the load-deformation relationship at this time is shown by a solid line in FIG. 11, and the characteristic J of the period-deformation relationship is shown by a solid line in FIG.

In this embodiment, the case where the buffer body 20 and the normal buffer body 30 are alternately laminated is disclosed. However, the present invention is not limited to this. May be interposed, or the normal buffer body 30 may be interposed at every plural stages of the buffer body 20.

Further, the thickness of the rubber body of the buffer alone may be made sufficiently large, and the buffer alone may be constituted. Further, as a basic minimum configuration, two rubber bodies may be initially deformed symmetrically between the upper and lower plates and fixed side by side, and in this case, an object which reciprocates in one direction to the vibration damping device may be used. It is suitable for application and can be downsized. Of course, it is also possible to arrange them in a combination in the orthogonal direction to cope with vibrations in all directions in the horizontal plane.

On the other hand, in each of the above embodiments, the case where the rubber body 24a is used as the elastic body 24 is disclosed. However, the present invention is not limited to this. In addition, the present invention is not limited to the disclosed forms of the above embodiments, but may be variously modified and combined as long as the setting required for the buffer of the present invention is possible. Furthermore, a TMD that works passively as the vibration damping device 12 using the laminated shock absorber 10 of the present invention has been disclosed. However, the present invention is not limited to this, and an active vibration damping device that actively operates a mass body, or a hybrid in which these are combined It may be configured as a vibration damping device or an isolator interposed between the building 14 and the foundation.

[0043]

As described above, the effects of the shock absorber of the vibration damping device of the present invention will be described below for each claim.

(1) In the shock absorber according to the first aspect, at least two or more of the plurality of elastic bodies fixed in parallel between the upper and lower plates are given an initial deformation in which the elastic force of the horizontal component is mutually canceled. Therefore, the spring stiffness of the shock absorber composed of a plurality of these elastic bodies is obtained as a composite of the spring stiffnesses of the individual elastic bodies. ), The rigidity peaks are dispersed and present at positions corresponding to their initial deformation directions and sizes in the horizontal plane, in accordance with the number of elastic bodies to which the initial deformation has been given. For this reason, the conventional shock absorber has a spring rigidity characteristic in which a plurality of elastic bodies are juxtaposed and fixed without giving initial deformation, and the peaks of the rigidities of all the elastic bodies are additively concentrated at the neutral point. Compared to the body
The shock absorber of the present invention has a spring rigidity characteristic in which the peak value of the rigidity is extremely low and the spring rigidity change amount is small over a wide range in the horizontal plane. Therefore,
For the vibration of the desired natural period to be tuned by the vibration damper,
Tuning can be performed over a wide range from a small amplitude to a large amplitude, and the amplitude range where vibration can be suppressed can be expanded as much as possible.

(2) In the shock absorber according to the second aspect, the number of elastic bodies provided between the upper and lower plates is set to the minimum two, and the initial deformation is given symmetrically in the horizontal direction. It is possible to obtain a small-sized shock absorber in which the amplitude range in which the reciprocating vibration can be suppressed is expanded as much as possible.

(3) In the cushioning member of the third aspect, since the elastic body is made of a rubber body, the diameter of the plurality of rubber bodies fixed in parallel between the upper and lower plates (flat cross section) is set when setting the spring rigidity characteristics. Area and thickness, and by changing the number of rubber bodies, including adding rubber bodies that do not cause initial deformation, without changing the material and composition of the rubber bodies themselves. The nonlinearity can be arbitrarily improved.

(4) In the laminated buffer of the fourth aspect, a single buffer is constituted by using the buffer of the third aspect as a minimum unit element, and the single buffer is laminated in a plurality of stages in the vertical direction.
As the amount of displacement when load fluctuations are applied increases,
Since the entire rubber stiffness is arranged in series, the overall spring stiffness can be reduced. Adjustment to match the natural period of the vibration damping object can be easily performed.

(5) In the shock absorber according to the fifth aspect, the shock absorber having an initial deformation applied to the rubber body is used as the first minimum element unit, and the shock absorber having no initial deformation applied to the rubber body is used as the second minimum element.
, The first minimum element unit and the second
Since the minimum element unit and the appropriate number are alternately laminated, the rubber body has a buffer body with initial deformation and a buffer body without initial deformation.
The overall spring constant when each of the shock absorbers is multilayered can be arbitrarily adjusted, and the resonance natural period can be tuned with high accuracy.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a vibration damping device using a laminated buffer according to the present invention.

FIG. 2 is a plan view showing an embodiment of a vibration damping device using the laminated buffer of the present invention.

FIG. 3 shows a basic structure of the present invention, and shows one of the shock absorbers as a minimum unit element of the laminated shock absorber.
It is arrow sectional drawing of the III-III line part.

FIG. 4 is a plan view showing one of the buffer bodies alone, which constitutes the basic structure of the present invention and is the minimum unit element of the laminated buffer body.

FIG. 5 is a front view of a laminated buffer body according to an embodiment of the present invention, in which a plurality of buffer units as minimum unit elements are laminated.

FIG. 6 shows the rigidity of the shock absorber alone showing one embodiment of the present invention.
It is a deformation characteristic diagram.

FIG. 7 is a load-deformation characteristic diagram of a laminated buffer body in which a plurality of buffer bodies according to one embodiment of the present invention are laminated.

FIG. 8 is a cycle-deformation characteristic diagram of a laminated buffer body in which a plurality of buffer bodies alone according to an embodiment of the present invention are laminated.

9 is a conventional rigidity-deformation characteristic diagram shown in comparison with the rigidity-deformation characteristic of the present invention shown in FIG.

FIG. 10 shows a modified embodiment of the laminated buffer of the present invention, in which a laminated single buffer of the first minimum unit element and a normal buffer of the second minimum unit element are laminated. FIG.

FIG. 11 is a characteristic diagram showing a load-deformation relationship in a modified embodiment of the laminated buffer of the present invention.

FIG. 12 is a characteristic diagram of a load-deformation relationship in a modified embodiment of the laminated buffer body of the present invention.

FIG. 13 shows the load-deformation relationship of the conventional shock absorber in (a).
It is a characteristic view which shows a period-deformation relationship in (b), respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Laminated buffer 12 Vibration suppression device 14 Building (object of vibration isolation) 16 Mass body 20 Buffer body alone (first minimum unit element) 22 Upper plate 22a Lower plate 24 Elastic body 24a Rubber body 30 Normal buffer body (No. 2 minimum unit element)

Claims (5)

[Claims] An upper plate and a lower plate which are vertically opposed to each other at a predetermined interval; and a plurality of elastic members fixedly arranged in parallel between the upper and lower plates and permitting relative displacement in the horizontal direction. A shock absorber for a vibration damping device, characterized in that at least two or more of them are provided with initial deformations that cancel each other out of the elastic force of the horizontal component. 2. The shock absorber according to claim 1, wherein the elastic member comprises two elastic members, and the elastic members are arranged symmetrically in the horizontal direction of the upper and lower plates. 3. The shock absorber according to claim 1, wherein the elastic body is a rubber body. 4. A laminated damper for a vibration damping device, wherein the buffer according to claim 3 is used as a minimum unit element, and the minimum unit element of the buffer is formed by laminating a plurality of stages in the vertical direction. body. 5. The buffer according to claim 3 as a first minimum unit element, and a plurality of elastic bodies made of a rubber body are juxtaposed and fixed between the upper and lower plates without giving an initial deformation in a horizontal direction. A buffer body for a vibration damping device, characterized in that the buffer body thus formed is used as a second minimum unit element, and the first minimum unit element and the second minimum unit element are formed alternately in an appropriate number. .