JPH0835539A - Shock eliminating device - Google Patents

Abstract

PURPOSE:To secure the firm insulation of vibration and realize the vibration insulation function for the firm installation, by forming a viscoelastic substance in the cavity between an outside tubular body and an inside tubular body. CONSTITUTION:In a cavity generated between the different tubular bodies made of metal, ceramics, synthetic resin, etc., or the cavity generated by the insertion of a rod-shaped body into the tubular body, the viscoelastic bodies 3 are formed into one layer or plural layers in a cylindrical form in the lateral sectional surface direction or the longitudinal sectional surface direction or in both the directions. On the inner surface of the outside tubular body 2 and/or on the outer surface of the inside tubular body or the inside rod-shaped body, a string- shaped vulcanized rubber 12 is formed integrally, and in the cavity of the inside and outside tubular body or the rod-shaped body, an unevenness 11 is formed, and the cavity of the unevenness 11 is charged with the viscoelastic bodies 3. Accordingly, the vibration transmission is clearly prevented in the range of 200-5,000Hz, and the vibration insulating effect can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for insulating and damping vibrations. More specifically, by forming a viscoelastic body in the space between the outer tubular body and the inner tubular body,
The invention relates to a shock absorbing device in which a vibrating object is attached to one of the inner and outer tubular bodies, and the other tubular body is attached to or in contact with the side where vibration transmission should be prevented. Specific examples thereof include suspending equipment such as suspended ceilings and ducts;
Examples include OA floor legs, machinery legs, pedestals, compressors, drive source supports such as motors, pipe mounting jigs, and bearing structure vibration damping devices. These are intended to provide a shock absorbing device which can be used both in a direction parallel to the axial direction of the tubular body and in a vertical direction.

[0002]

2. Description of the Related Art With the development of science and technology in recent years, a wide variety of machines and electric / electronic devices have been used. Conventionally, since the power unit and drive unit of equipment such as those machines serve as a vibration source, some vibration and sound proofing measures are taken to prevent the vibration from being transmitted to other parts. Although it is considered, if it is necessary to attach it firmly, at best, only means such as bolting with rubber packing is taken, and if the vibration source is firmly attached, the attachment side is inevitably attached. It was vibrating.

[0003]

As the prior art, coil springs, leaf springs, disc springs, air springs, anti-vibration rubber, etc. are known as a structure to which a load is applied mainly from the above. There are some suspension structures that apply force, but this is a form in which rubber is adhered between flat plates.Since the planar shear force of rubber is used, shear force within a fixed shape is used. Has the drawback of being able to control Furthermore, if an accident such as a defective adhesion occurs, there is a drawback in that it is not possible to take measures such as preventing falling. In addition, there is a drawback that it is liable to be supported in an oblique direction in which it is necessary to support the force in the vertical direction and it is difficult to sufficiently exhibit the vibration damping performance. In addition, the direction of vibration is effective not only in a fixed direction but also in vertical and horizontal fluctuations, and it was not possible to hold a constant force displacement.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide a shock absorbing device having a vibration insulating function for more surely insulating the vibration and mounting it firmly enough. To do.

In the case of application to a hanging tool, the purpose is to ensure that the load is supported in the vertical direction and a fall stop is provided in case of an accident such as a fire to ensure safety. . Another object of the present invention is to reduce noise generation by preventing vibration. Still another object of the present invention is to prevent vibration while controlling the vibration direction of the vibration source not only in a fixed direction but also in multiple directions within a fixed displacement amount.

The present invention has been achieved by challenging the problem of how to insulate the vibration of a vibrating body and firmly attaching it to another member, and achieving the desired items. The skeleton means is to provide a gap between the outer tubular body having sufficient rigidity and the inner tubular body or the inner rod-shaped body,
The point is to provide a viscoelastic body in the gap.

According to the present invention, a viscoelastic body is traversed in a tubular shape into voids formed between tubular bodies made of metal, ceramic, synthetic resin or the like and having different diameters, or into voids formed by inserting rod-shaped bodies into the tubular bodies. The shock absorbing device is characterized in that one layer or a plurality of layers are formed in a plane direction or a longitudinal cross section direction, or both of them.

The object of the present invention is to provide a tubular body of the outermost layer in which tubular bodies made of a material such as metal, ceramics or synthetic resin and having different diameters are combined, or a tubular body and a rod-shaped body are combined with a gap. Is set longer below or above the inner layer tubular body and / or rod-shaped body, and the void is formed into a cylindrical shape.
It is formed by a layer or a plurality of layers, and a cylindrical void is formed on the upper side or the lower side thereof, and the same or different viscoelastic body is provided in the cylindrical portion and the cylindrical portion of the void. It is in a shock absorber.

Still another object of the present invention is to provide a tubular body made of a material such as metal, ceramic, or synthetic resin and having different diameters, or a tubular body and a rod-shaped body which are combined with each other with a gap. The tubular body of the outermost layer is set to be longer or lower than the tubular body and / or the rod-shaped body of the inner layer, the void is formed into a tubular shape, and the cylindrical void is formed on the upper side or the lower side thereof,
A shock absorbing device is characterized in that a viscoelastic body is provided in the cylindrical portion of the void.

Still another object of the present invention is to provide voids between tubular bodies made of materials such as metals, ceramics and synthetic resins having different diameters, or voids formed by inserting rod-shaped bodies into the tubular bodies. In a shock absorbing device formed by forming one layer or a plurality of layers of a viscoelastic body in a tubular shape in a transverse direction or a longitudinal direction, or both, an inner surface of the outer tubular body and / or an inner tubular body or an inner rod-shaped body A shock-absorbing device characterized in that a string-like vulcanized rubber is integrally formed on the outer surface of the body, and irregularities are formed in the voids of the inner and outer tubular bodies or rod-shaped bodies, and the viscoelastic body is filled in the irregular voids. It is in.

Still another object of the present invention is that the outer surface of the inner tubular body or the rod-shaped body to be inserted into the outer tubular body is made of the same material as the tubular body or the rod-shaped body or a convex portion and / or a viscoelastic body.
Or having a concave portion, and / or the surface of the outer tubular body layer is made of the same material as the tubular body or a viscoelastic body, and the convex portion and / or the concave portion is 1
There is provided a shock absorbing device characterized in that a viscoelastic body is formed in a space between an outer tubular body and an inner tubular body, which has a plurality of locations.

[0012]

Next, each component will be described in detail. The outer tubular body is a metal such as iron, aluminum, copper, or lead; acrylic, polycarbonate, vinyl chloride, polyethylene,
A synthetic resin such as polypropylene or polyester; a single material such as ceramic, or a ceramic composite tubular body reinforced with a fibrous material, a mesh material, or the like may be used. Further, by providing a string-shaped portion, a convex portion and / or a concave portion with the material of the tubular body or another material on the inner surface of the tubular body, resistance against shear deformation of the viscoelastic body can be given, so that a larger control is provided. You can get the shaking effect. Further, by using vulcanized rubber as the material for forming the string-like portion, the convex portion, and the concave portion, when a load is applied in a direction perpendicular to the axial direction of the tubular body, the deformation due to the load is reduced, and , It is possible to improve the vibration damping performance. In addition, it is possible to freely set the presence or absence of coating on the inner and outer surfaces, and the presence or absence of flanges, pin holes, etc., and threading for mounting to prevent falling. The cross-sectional shape orthogonal to the axial direction may be circular, elliptical, or polygonal, and the shape outside the tube and the shape inside the tube may be different.

The material surface of the inner tubular body or the inner rod-shaped body is the same as that of the outer tubular body, and may not be the same material as the outer tubular body. Also, the cross-sectional shape orthogonal to the axial direction is circular,
It may be oval or polygonal, and it can be used as a primer to improve the adhesion of the inner and outer surfaces, coating for corrosion protection, flanges and pin holes to prevent falling, and threading for mounting.
The presence or absence can be set freely. On the outer surface of the inner tubular body, the convex portion, the concave portion, and the string portion may be made of the same material as the tubular body or other materials. By providing such concave portions, convex portions, and string portions, it is possible to further improve the vibration damping effect. Further, by filling the voids in the inner tubular body with the following viscoelastic body, it is possible to further enhance the vibration damping effect.

Next, the viscoelastic body will be described. A viscoelastic body exhibits various phenomena such as creep, delayed elasticity, and stress relaxation, and has a characteristic that time is involved in the relationship between strain and stress. Specific examples of viscoelastic bodies suitable for use in the present invention are given below. And there is the following. That is, NBR, SBR, BR, IR, IIR, CR, EP, natural rubber generally called rubber
T, chlorosulfonated polyethylene, fluorine rubber, urethane, polysulfide, silicon polynorbornene SIS, SBS, SIBS, SEBS various liquid rubbers are listed as the polymer component, and one or more of them can be used in combination.

Since the viscoelastic body applied to the present invention inevitably changes the shear resistance due to the gaps and depths between the tubular bodies,
Even if the same viscoelastic body is used, it is possible to make a very wide range of loading capacity difference, and conversely, if the viscoelastic body is provided in the voids or depths of the same tubular body, it is very common. The material can be used as a viscoelastic body, but in order to obtain particularly excellent vibration damping properties, the viscoelastic body uses a hydroxyl group-terminated telechelic polymer as the main polymer of the main component, and an isocyanate group per molecule is 2 A viscoelastic body obtained by reacting a curing agent having one or more of them with a reaction molar ratio of NCO / OH = 0.5 to 2.0 is particularly preferable. From the viewpoint of further weight reduction and cost reduction, the viscoelastic body is formed into a foam. Viscoelastic bodies are also preferred. The NCO / OH reaction molar ratio is determined by the hydroxyl group content, which represents the weight percentage of hydroxyl groups in the hydroxyl group-terminated liquid diene rubber, and the isocyanate content, which represents the weight percentage of the isocyanate groups of the isocyanate curing agent, as shown below. It is a value.

[Equation 1]

Here, NCO molecular weight / OH molecular weight = 42/17
= 2.47, that is, when the NCO / OH reaction molar ratio is less than 0.5, the isocyanate curing agent is insufficient and the curing reaction is incomplete, resulting in unreacted hydroxyl group-terminated liquid diene rubber in the operating temperature high temperature range. Occurs, and conversely, rubber elasticity becomes insufficient in the low temperature range, and the vibration absorption performance deteriorates.
Further, it is not preferable because it is susceptible to heat aging and durability is deteriorated, and the risk of defective curing is increased. On the other hand, when the NCO / OH reaction molar ratio exceeds 1.5, the isocyanate-based curing agent becomes excessive, rubber elasticity becomes insufficient, and the vibration absorption performance deteriorates. A foaming phenomenon occurs due to a reaction with the water content and the like, which is not preferable because not only the vibration absorption performance is deteriorated but also the durability is adversely affected.

In order to actually apply the present invention, various properties such as vibration damping property, compression property, expansion / contraction durability, adhesiveness, temperature property, etc. may be selected depending on the purpose of use such as polymer component, cross-linking agent component and various other properties. It is necessary to properly use the compounding agents and formulate a compounding recipe that matches the purpose.

Next, a compounding agent and an additive compounded to achieve the object will be described. By using a plasticizer as a compounding agent, it is possible to improve the kneading workability of other compounding agents and adjust the plasticizer to give a large factor to the hardness and compression characteristics of the viscoelastic body. Specific examples thereof include naphthenic oil, aromatic oil, paraffinic oil, phthalic acid derivative, isophthalic acid derivative, adipic acid derivative, maleic acid derivative, tall oil, pine oil, cottonseed oil, castor oil, liquid rubber, polybutene and the like. Yes, they can be used alone or in combination. It is necessary to select those that are compatible with the polymer component and compatible with the service temperature range.

The filler is a factor that affects the vibration damping property, expansion / contraction repeating property, etc., and specific examples thereof include scale-like inorganic powders such as mica, graphite, leucite, clay and talc, ferrite, metal powder, High specific gravity filler such as barium sulfate and lithopone, calcium carbonate, aluminum hydroxide,
It is also possible to use general-purpose fillers such as magnesium carbonate, carbon, and finely divided silica alone or in combination. Further, antimony trioxide, borax, expandable graphite, etc. can be used for the purpose of flame retardancy. In addition, sulfur, peroxides, amines, isocyanates, metal oxides and the like can be used as the crosslinking agent. In the present invention, considering compression characteristics, temperature characteristics, expansion / contraction repeating characteristics, etc., the range that can be used in the non-crosslinked state is sometimes limited. It is desirable to select a suitable crosslinking agent and use it as a crosslinked viscoelastic material. In addition, if necessary, a reaction accelerator, an antiaging agent, a coupling agent, an antifungal agent, a rust preventive agent, a pigment, a surfactant, a tackifying resin, a bituminous substance, a foaming agent and the like can be added.

The viscoelastic body used in the present invention may be a combination of only the same material or a combination of a plurality of materials. Depending on the thickness, width, and type of the viscoelastic body, there is a merit that the load capacity, the amount of displacement during loading, and the direction of vibration control can be freely designed, and depending on the combination of tubular bodies and tubular bodies or tubular bodies and rod-shaped bodies. The diameter can also be changed. Further, by connecting a plurality of the same devices in series or in parallel, a greater vibration damping effect can be exerted, and a tubular body is further provided outside the outer tubular body to form a plurality of viscoelastic body layers. By doing so, it is possible to exert a further excellent vibration damping effect.

In the vibration-proof jig of the present invention, vibration is received by the inner tubular body or the rod-shaped body, and is fixed by the outer tubular body via the viscoelastic body on the outer periphery of the tubular body or the rod-shaped body. Alternatively, on the contrary, the vibration received by the outer tubular body is fixed to the inner tubular body or the rod-shaped body through the viscoelastic body on the inner circumference. When used as above,
Although a tubular body or rod-shaped body that is directly subjected to vibration tries to vibrate, the shearing force of the viscoelastic body on the outer or inner circumference exerts a force to return to the original state, so the vibration stress is also reduced. However, since the damping of the vibration also becomes large, the vibration is suppressed. Further, by using the viscoelastic body in a plurality of layers and increasing the contact area between the tubular body and the viscoelastic body by the convex and concave portions, there is an advantage that a greater shearing stress is exerted and a large vibration damping effect is obtained.

By inserting a viscoelastic body such as vulcanized rubber into the space between the tubular bodies, the viscoelastic body is prevented from sagging when used in a direction perpendicular to the axial direction, and sufficient control is provided for a long period of time. It can also exert a vibration effect.

Further, when the viscoelastic body is a crosslinked viscoelastic body, since the expansion and contraction restoring force is further improved, it has a stable vibration preventing function for a longer period and can be used even for a larger displacement. You will be able to do it.

[0024]

Example 1 In Example 1, a 32A steel pipe was inserted into a 50A steel pipe, the composition shown in Table 1 was used as the viscoelastic body, and the outer tubular body was vibrated by the method shown in Test Method 5. Fig. 10, Fig. 10 shows the vibration state of the outer tubular body and the vibration state of the inner tubular body.
Shown in 11.

In Example 2, a 15A steel pipe was inserted into a 32A steel pipe, the viscoelastic body was a mixture shown in Table 1, a flange was attached to the outer tubular body, and an inner tubular body was attached. Was fitted with a vulcanized rubber cap. This test piece was attached to a commercially available conventional product as shown in Test Method 2, placed on a 150 mm RC slab, and subjected to a lightweight floor impact test. In addition, a commercially available conventional product was measured and the improvement amount was shown.

Example 3 shows a case where the viscoelastic body of Example 2 was a foam shown in Table 2.

Example 4 shows the case where the viscoelastic body of Example 2 was a hot melt shown in Table 3.

Example 5 shows the case where the viscoelastic body of Example 2 was the EPT rubber shown in Table 4.

Example 6 shows a case where the inner tubular body of Example 2 was provided with irregularities and then the viscoelastic body shown in Table 1 was formed.

Example 7 shows a case where the viscoelastic body of Example 2 was formed into both of the columnar ones shown in Table 1.

Example 8 was the same as Example 2 except that the compounds shown in Table 1 were used as the viscoelastic body, and the inner tubular body was also provided with the viscoelastic body. Flange was attached to both of the bodies, a compressor was attached to the flange on the inner tubular body side, an air conditioner outer box was attached to the flange on the outer tubular body side, and three pieces were attached in the same manner. Next, noise measurement was performed according to Test Method 3, and the improvement amount with respect to the conventional product was shown in dB (A) with all-pass.

In Example 9, a tubular body of 100 A is attached to a tubular body of 88 A, a viscoelastic body is attached to the inside, a motor is attached to the inside tubular body, and it is set in a vacuum cleaner. JIS-C-9108
The noise was measured in accordance with the above, and the improvement amount with respect to the conventional product is shown by all-pass dB (A).

Test method 1. Adhesive force A viscoelastic body is sandwiched between an iron plate and a polyester cloth with a 180 ° peel adhesive force according to JIS-K-6829-12, and 200 mm / min.
Was peeled at a speed of 180 ° and peeled at 180 °. 2. Floor impact sound In accordance with JIS-A-1418, remove the legs of a commercially available floor on a 150 mm RC slab, attach the outer tubular body, and attach the vulcanized rubber cap to the portion of the inner tubular body that contacts the slab surface to place the floor. After forming, it was vibrated by a tapping machine and the sound was measured by receiving the sound with a microphone in the room directly below, and the improvement amount was shown in comparison with the conventional commercial product. 3. Noise improvement amount The noise of the air conditioner outdoor unit according to JIS-C-9612 is compared with the conventional product, and the improvement amount is shown in dB (A). 4. Noise improvement amount The noise amount of the vacuum cleaner was compared with the conventional product according to JIS-C-9108, and the improvement amount is shown in dB (A). 5. Vibration transmission situation Vibration of the inner tubular body when the outer tubular body was vibrated by measuring the acceleration with a pickup attached to the outer tubular body and the inner tubular body by mounting the sample on a shaker and performing random vibration I saw the situation of communication. 6. Shape retention at 80 ℃ Create a viscoelastic body with a length of 30mm × width of 30mm × thickness of 10mm, cure it at room temperature for 1 week, leave it at 80 ℃ for 4 hours or more, and then leave it at room temperature to reduce its thickness. The rate of change was measured, and the original thickness retention rate of 90% or more was indicated as ◯, and the 90% or less retention rate was indicated as x.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

[0039]

[Effects of the Invention] In the first embodiment, as shown in FIGS.
A large vibration transmission prevention performance is clearly seen in the range of 00 Hz, which shows that it is effective for vibration isolation.

In Example 2, as shown in the results shown in Table 5, by using the device of the present invention as the legs, the vibration transmission to the floor slab is prevented and the floor impact sound can be greatly improved.

Example 3 is a case where the viscoelastic body is a foaming type viscoelastic body, which is also improved by one rank or more as compared with the conventional commercial product.

Example 4 shows the case where the viscoelastic body is a hot melt type, which is also improved by one rank or more as compared with the conventional commercial product.

Example 5 shows the case where the viscoelastic body is an EPT vulcanized rubber, which is also improved by a little less than the rank of the conventional commercial product.

Example 6 shows the case where the viscoelastic body has the same composition as that of Example 2 and the inner tubular body is provided with irregularities, which is a great improvement over the conventional commercial product.

Example 7 shows a case in which a viscoelastic body having the same composition as in Example 2 was applied to form not only the space between the inner tubular body and the outer tubular body but also the lower portion in a cylindrical shape. Has also been greatly improved.

Example 8 shows a case in which the compressor is attached to the air conditioner outer box by using the same three devices as in Example 2, and it is shown that it is reduced by about 4 dB (A) as compared with the conventional commercial product.

Example 9 is an example in which the motor part of a commercially available vacuum cleaner is attached to a combination of a tubular body made of 88A steel, a tubular body made of 100A steel and a tubular viscoelastic body. dB
(A) It shows that it was improved.

From the above, it can be seen that a significant improvement effect can be obtained by using the shock absorbing device of the present invention. Therefore, there are many examples of applications such as legs on floors and floors, pedestals for compressors, support parts for motors, etc.
Since a very large vibration insulation effect can be exhibited, the industrial utility value of the present invention is very large.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a sectional view parallel to the axial direction of the present invention,
It is a figure which shows the example which used the viscoelastic body by 2 layers.

FIG. 3 is a cross-sectional view showing an example in which a columnar viscoelastic body is formed in a void inside the outer pipe at the lower portion of the inner pipe.

FIG. 4 is a sectional view perpendicular to the axial direction of the present invention,
It is a figure which shows the example in which a tubular body is circular inside and outside.

FIG. 5 is a sectional view perpendicular to the axial direction of the present invention,
It is a figure which shows the example in which an outer tubular body is circular and an inner tubular body is elliptical.

FIG. 6 is a sectional view perpendicular to the axial direction of the present invention,
FIG. 6 is a cross-sectional view showing an example in which a rod-shaped body having a quadrangular outer cross section, a circular inner cross section, and a circular cross section is inserted inside the outer tubular body.

FIG. 7 is a sectional view perpendicular to the axial direction of the present invention,
FIG. 3 is a cross-sectional view showing an example in which the viscoelastic body is tubular and has two layers.

FIG. 8 is a sectional view perpendicular to the axial direction of the present invention,
FIG. 4 is a cross-sectional view showing an example in which a viscoelastic body is formed in a gap between tubular bodies having inner and outer tubular bodies each having a concave portion and a convex portion.

FIG. 9 is a sectional view perpendicular to the axial direction of the present invention,
FIG. 3 is a cross-sectional view showing an example in which a string-like vulcanized rubber is arranged in a gap between an outer tubular body and an inner tubular body and a viscoelastic body is formed in the remaining voids.

FIG. 10 is a graph of vibration conditions of the outer steel pipe.

FIG. 11 is a graph showing a vibration state of an inner steel pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner tubular body or rod-shaped body 2 Outer tubular body 3 Viscoelastic body 4 Polymer foam 5 Fall prevention pin 6 Fall prevention middle hole 7 Packing material 8 Screw processed portion 9 Bolt hole 10 Flange 11 Concavo-convex vulcanized rubber

Claims (8)

[Claims] 1. A viscoelastic body is formed into a tubular shape in a transverse cross-sectional direction in a space formed between tubular bodies having different diameters made of a material such as metal, ceramic, or synthetic resin, or in a space formed by inserting a rod-shaped body into the tubular body. Alternatively, the shock absorbing device is characterized in that one layer or a plurality of layers are formed in the longitudinal section direction or both of them. 2. A tubular body made of a material such as metal, ceramic, or synthetic resin and having different diameters, or a combination of a tubular body and a rod-shaped body with a gap, wherein the outermost tubular body is the inner tubular body and / Or set longer on the lower side or the upper side of the rod-shaped body, the void is formed in a cylindrical shape in one layer or a plurality of layers, and a cylindrical void is formed on the upper side or the lower side,
A shock absorbing device, characterized in that the same or different viscoelastic body is provided in the cylindrical portion and the cylindrical portion of the void. 3. A tubular body made of a material such as metal, ceramic, or synthetic resin and having different diameters, or a combination of tubular bodies and rod-shaped bodies provided with a gap, wherein the tubular body of the outermost layer is the tubular body of the inner layer. Set longer or lower than the body and / or rod-shaped body to form a void in the shape of a cylinder, and form a cylindrical void in the upper or lower side of the void, and a viscoelastic body in the cylindrical portion of the void. A shock absorbing device characterized by being provided with. 4. A viscoelastic body is tubularly cross-sectioned into voids formed between tubular bodies having different diameters made of materials such as metals, ceramics, and synthetic resins, or voids formed by inserting rod-shaped bodies into the tubular bodies. 1 in direction and / or longitudinal direction
In a shock absorbing device formed by forming a plurality of layers, a string-like vulcanized rubber is integrally formed on the inner surface of the outer tubular body and / or the outer surface of the inner tubular body or the inner rod-shaped body to form an inner or outer tubular body or a rod-shaped body. A shock absorbing device characterized in that irregularities are formed in voids of a body, and the voids having irregularities are filled with a viscoelastic body. 5. The outer surface of the inner tubular body or rod-shaped body to be inserted into the outer tubular body has a convex portion and / or a concave portion made of the same material as the tubular body or rod-shaped body or a viscoelastic body, and / or the outer tubular body. The layer surface is made of the same material as the tubular body or a viscoelastic body, and has one or more convex portions and / or concave portions, and the viscoelastic body is formed in the gap between the outer tubular body and the inner tubular body. Shock absorber. 6. The viscoelastic body is made of a reactive polymer which is liquid at room temperature, and the viscoelastic body after the reaction retains its shape even when heated to 80 ° C. and is defined in JIS-K-6829-12. The shock absorbing device according to any one of claims 1 to 5, wherein the adhesive strength to be applied is 0.5 kg / cm or more. 7. The viscoelastic body comprises a hydroxyl group-terminated telechelic polymer as a main component as a main polymer, and a curing agent having two or more isocyanate groups per molecule in a reaction molar ratio of NC.
The shock absorbing device according to claim 1 or 5, wherein the shock absorbing device is obtained by reacting with O / OH = 0.5 to 2.0. 8. The shock absorbing device according to claim 1, wherein the viscoelastic body is a foam.