JP2002106631A - Vibration damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device having a new structure that has advantageousness of both viscoelastic damper and viscous damper, has little temperature dependency, dispenses with a rigid seal mechanism, and can exhibit a sufficient damping performance. SOLUTION: The vibration damping device comprises an outer cylinder 1 and an inner cylinder 2 having an outer diameter smaller than the inner diameter of the outer cylinder 1 and disposed in the outer cylinder. Two parts between the outer cylinder 1 and the inner cylinder 2 are sealed with a seal member 3 made of an elastic body or viscoelastic body, and a space surrounded with the outer cylinder 1, the inner cylinder 2, and the seal member 3 is filled with the elastic body 5. The inner cylinder 1 is provided with a projecting part 21 projecting in the diameter direction, and a restricting means for restricting movement of the elastic body 5 filled into the space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, and more particularly to a vibration damping device which can be used as a damper for controlling various vibrations such as earthquakes, winds, traffic vibrations, etc. occurring in buildings. .

[0002]

2. Description of the Related Art Conventionally, various types of vibration damping devices have been developed and used for the purpose of preventing vibrations of floors, machines and the like of vehicles and buildings and for soundproofing of acoustic equipment. As such a vibration damping device, for example, a viscoelastic damper using a polymer-based viscoelastic material and an oil damper using a viscous material such as oil are known.

A viscoelastic damper has a structure in which a polymer-based viscoelastic material is sandwiched between two parallel plates or between two tubes arranged concentrically. The shear force of the viscoelastic material is accompanied by a resistance with history. Therefore, its characteristics largely depend on the viscoelastic material used, and have a characteristic dependence on the frequency and strain temperature depending on the type of the viscoelastic material. In addition, viscoelastic dampers generally use the damping performance of a viscoelastic material with a phase transition in the glass transition region. The viscoelastic damper is affected by changes in the elastic modulus due to temperature changes, and the change in the damping force is large over the operating temperature range. There's a problem.

[0004] On the other hand, an oil damper is composed of a cylinder and a piston filled with oil. When the cylinder and the piston move relative to each other, the oil passes through a valve (orifice) provided in the piston, and a fluid resistance generated at that time causes the oil to pass through. It exerts a damping force. Depending on the oil used in the oil damper, temperature dependency may occur.However, by using an oil such as a silicone-based oil that has a small change in viscous resistance due to temperature,
It has become possible to keep the performance constant in the operating temperature range of the damper.

However, in the oil damper, since oil passes through a narrow valve by a high internal pressure, a strict seal is required in a gap between the piston and the cylinder to prevent oil leakage, and extremely precise machining is required. Become.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel vibration damping device having advantages of both a viscoelastic damper and a viscous damper. In addition, the present invention has little temperature dependency, and does not require a strict sealing mechanism.
An object of the present invention is to provide a vibration damping device capable of exhibiting sufficient damping performance.

[0007]

According to a first aspect of the present invention, there is provided a vibration damping apparatus comprising: an outer cylinder; an inner cylinder having an outer diameter smaller than the inner diameter of the outer cylinder and disposed in the outer cylinder; A sealing member made of an elastic body or a viscoelastic body for sealing between the outer cylinder and the inner cylinder at at least two locations spaced apart in the axial direction; an inner surface of the outer cylinder, an outer surface of the inner cylinder, and the sealing member And a restricting means for restricting movement of the viscous body in the space.

When the outer cylinder and the inner cylinder move relative to each other, the viscous material flows in the space between the outer cylinder and the inner cylinder. This flow causes viscous friction of the viscous body itself and resistance due to the limiting means, and exerts a damping force. A preferred embodiment of the restricting means is at least one convex portion of the inner cylinder that protrudes in the radial direction of the inner cylinder, and the resistance force is generated by a viscous body flowing through a gap between the convex portion and the outer cylinder. The inner cylinder convex portion may have one or more holes penetrating in the axial direction that allow the viscous body to flow.

In this vibration damping device, the space between the outer cylinder and the inner cylinder is sealed by a sealing member made of an elastic body or a viscoelastic body, so that a strict seal like a conventional oil damper is not required. , A simple configuration.

[0010] In addition to the above-mentioned resistance due to the flow of the viscous body, a resistive force utilizing the shear deformation of the elastic body or the viscoelastic body interposed between the outer cylinder and the inner cylinder is provided. The damping by the viscoelastic body is particularly effective for minute vibrations having a small amplitude. In order to enhance the vibration damping effect of the seal member, it is particularly preferable to use a viscoelastic body having an equivalent damping constant (heq) of 0.2 or more as the seal member. As a suitable material for the seal member, a viscoelastic body containing silicone rubber can be used.

In the vibration damping device of the present invention, preferably, the viscous body is a silicone oil or a silicone oil compound.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vibration damping device according to the present invention will be described below.

FIGS. 1 (a) to 1 (c) are side sectional views showing an embodiment of a vibration damping device 10 according to the present invention.
FIG. 3 is a cross-sectional view along A and a cross-sectional view along line BB.
The vibration damping device 10 includes a cylindrical outer cylinder 1, an outer diameter D <b> 2 arranged concentrically with the outer cylinder 1, an outer diameter D <b> 2 smaller than the inner diameter D <b> 1 of the outer cylinder 1, and an inner diameter substantially equal to the outer cylinder 1. The cylinder 2 and the outer cylinder 1 and the inner cylinder 2 at both ends of the outer cylinder 1 and the inner cylinder 2
, The seal members 3 and 4 interposed therebetween, and the inner surface of the outer cylinder 1,
The viscous body 5 is filled in a space surrounded by the outer surface of the inner cylinder 2 and the two seal members 3 and 4.

The outer cylinder 1 is made of, for example, a metal pipe and has a flange 11 at one end for fixing to a structure such as a building (not shown). The inner cylinder 2 is made of, for example, a metal columnar member, and may be hollow or dense.
At the center in the longitudinal direction, a convex portion 21 having a larger diameter than other portions is formed. As a result, the gap between the inner surface of the outer cylinder 1 and the outer surface of the inner cylinder 2 is narrower at the convex portion 21 than at other portions. When the viscous material 5 flows due to the relative movement of the outer cylinder 1 and the inner cylinder 2 in the axial direction, the flow is restricted by the narrow gap and a resistance force is generated. The resistance of the viscous body 5 can be adjusted by adjusting the length L2 and the diameter D'2 of the protrusion 21 in the longitudinal direction.

The seal members 3, 4 are made of an elastic body or a viscoelastic body, and seal the space between the outer cylinder 1 and the inner cylinder 2. The seal members 3 and 4 are preferably a viscoelastic body having viscosity and elasticity, and particularly preferably a rubber material exhibiting viscoelasticity in the range of 0 ° C. to 40 ° C. which is the operating temperature range of the vibration damping device. Examples of such rubber materials include rubber materials such as natural rubber, isostyrene rubber, styrene butadiene rubber, butadiene rubber, nitrile rubber, butyl rubber, halogenated rubber, chloroprene rubber, ethylene propylene rubber, silicone rubber, and polynorbornene.

The damping characteristic of a viscoelastic material is represented by an equivalent damping constant (he
q) It is preferably 0.2 or more, in particular, the ratio G ′ ₍₀₎ / G ′ _{(40 )} of the storage shear modulus G ′ ₍₀₎ at ₀ ° C. and the storage shear modulus G ′ ₍₄₀₎ at 40 ° C. ₎ Is preferably from 1.0 to 2.0. Silicone rubber is preferred as such a material having a low temperature dependence of the damping characteristic, and in particular, silicone rubber containing silica as a filler is suitable.

Such a viscoelastic body is formed, for example, by flowing a raw rubber material before cross-linking between an outer cylinder 1 and an inner cylinder 2 arranged concentrically, cross-linking and hardening the raw rubber material. The sealing members 3 and 4 can be integrated.
The viscoelastic body is particularly effective for damping minute vibrations having a small amplitude, and the damping force is adjusted by the thickness L3 (thickness in the longitudinal direction of the cylinder) and the shear surface area of the seal members 3, 4. can do. The shear area is determined by the inner surface of the outer cylinder 1 and the inner cylinder 2
Is defined by the cross-sectional area of the seal member surrounded by the outer surface of the seal member.

The viscous material 5 is not particularly limited, but preferably has little temperature dependence. Examples of such a viscous material include silicone oil and an oil compound obtained by adding a filler such as silica to silicone oil. In particular, a silicone oil compound in which the viscosity and the like can be easily adjusted is preferable.

The vibration damping device having such a configuration can be manufactured by the following manufacturing method.

FIG. 2 is a view showing an embodiment of a method of manufacturing a vibration damping device according to the present invention. As shown in FIG.
And inner cylinder 2 divided into two parts, main body and bottom, respectively 1
a, 1b, 2a, and 1b are prepared, and the outer cylinder main body 1a and the inner cylinder main body 2a are arranged concentrically so that the upper ends thereof are downward.
Similarly, the outer cylinder bottom 1b and the inner cylinder bottom 2b are concentrically arranged with their lower ends facing down. Between the outer cylinder main body 1a and the main body 2a and between the outer cylinder bottom 1b and the inner cylinder bottom 2b, a rubber composition obtained by adding a cross-linking agent and necessary additives to raw silicone rubber has a predetermined height. After being poured into the seal member, the main body and the bottom of the outer cylinder and the inner cylinder are connected to each other via a viscoelastic body to form the seal members 3 and 4.

Next, as shown in FIG.
A viscous body 5 is filled between a and the inner cylinder main body 2a, and the main body and the bottom are connected and fixed. As a fixing method, for example, after fixing the inner cylinder main body 2a and the bottom part 2b by screwing or screws, the outer cylinder main body 1a and the bottom part b can be fixed by a fixing member (not shown).

The vibration damping device of the present invention is not limited to the above-described manufacturing method. For example, after an outer cylinder, an inner cylinder and a sealing member are formed, the outer cylinder is provided in a space formed by these members. It can be manufactured by any method such as injecting a viscous material from the inlet.

In the vibration damping device of the present invention having such a structure, for example, the vibration direction and the axial direction of the device are fixed between the fixed portion of the structure and the movable portion vibrating with respect to the fixed portion. I do. For example, it can be installed as a damper between beams of a building, between beams and columns, a part of a column of a structure, a connecting portion of columns, or the like. With the vibration of the movable part B, the outer cylinder 1 and the inner cylinder 2
Move relative to each other in the axial direction, the outer cylinder 1 and the inner cylinder protrusion 2
The vibration is attenuated by the resistance force caused by the flow of the viscous body through the gap with the first member. Further, since the seal member 3 is a viscoelastic body, a damping force due to the shearing deformation is also provided, so that vibration having a wide range of characteristics can be effectively damped.

The damping characteristics can be adjusted by the inner diameter of the outer cylinder, the diameter of the inner diameter, the diameter and length of the convex portion of the inner diameter, the thickness of the sealing member, and the shear surface area. It is possible to design so as to obtain a desired damping force in consideration of the application.

Further, the vibration damping device of the present invention can exhibit high damping performance by using silicone rubber having a low temperature dependency as the seal member 3 and using silicone oil as the viscous material, and can withstand a temperature change. There is little change in damping performance and it can respond to environmental changes.

The embodiment of the vibration damping device according to the present invention has been described above. However, the vibration damping device according to the present invention is not limited to this embodiment, and various modifications can be made.

FIG. 3 is a view showing another embodiment of the vibration damping device according to the present invention. In this embodiment, an axial through-hole 21a is formed in a convex portion of an inner cylinder which is a restricting means for restricting the movement of a viscous body. They are provided at equal intervals on the circumference. Although five through holes are shown in the figure, the number of through holes may be arbitrary.

The through hole provides a small flow path of the viscous material sealed between the inner cylinder and the outer cylinder when the inner cylinder makes an axial relative movement with respect to the outer cylinder, thereby providing a viscous material. Resistance to the flow of water can be adjusted.

FIG. 4 is a view showing still another embodiment of the vibration damping device according to the present invention. In this embodiment, the inner cylinder convex portions are provided at a plurality of positions (two positions in the figure) of the inner cylinder. It is. Also in this case, a through hole as shown in FIG.

The vibration damping device of the present invention can be variously modified in addition to the modifications shown in FIGS. For example, FIG. 1 shows an outer cylinder and an inner cylinder having the same length, but one of them may be longer than the other.
Furthermore, although a convex portion integrally formed with the inner cylinder is shown as a restricting means, such a convex portion may be provided on the outer cylinder side, and in this case, not only at one position but also at a plurality of positions. It is also possible to provide.

[0031]

The present invention will be described in more detail with reference to the following examples. Example 1

An outer cylinder having a length of 100 mm and an inner diameter of 44 mm;
Oil prepared by preparing an inner cylinder having a length of 100 mm, a diameter of a small diameter portion of 25 mm, and a diameter of a convex portion of 43 mm, sealing both ends with seal members, and filling a viscous material between the outer cylinder and the inner cylinder. A damper was manufactured. Silicone rubber (SH9555: manufactured by Dow Corning Toray Silicone Co., Ltd.) was used as the sealing member, and the thickness (d) was 9.5 mm and the shear surface area was 2200 mm ² . The viscosity is 0.0
A silicone oil compound of 02 MPa · s was used.

This damper was heated at 0 ° C., 20 ° C., 40 ° C.,
A sine wave was applied three times under the conditions of a frequency of 1.0 Hz and a strain of 100%, and the storage shear modulus G ′ and the equivalent damping constant heq at each temperature were measured. As the measured value, the third value among the results obtained by applying the vibration three times was adopted. Further, in order to examine the temperature dependence of the storage shear modulus, the value G ′ at 0 ° C.
The ratio between (0) and the value G ′ (40) at 40 ° C. was determined.
Table 1 shows the results.

[0034]

[Table 1]

Comparative Example As a comparative example, a damper having the same configuration as that of the example except that the viscous material was not filled between the outer cylinder and the inner cylinder was manufactured, and the damping characteristics were measured in the same manner. The results are shown in Table 1.

As shown in Table 1, a high damping performance was obtained by using a structure in which the space between the outer cylinder and the inner cylinder was filled with a viscous material. Further, in the damper of Example 1, a material having little temperature dependency was used as the material of the sealing member and the viscous body, so that a damper having very little temperature dependency of the storage shear modulus was obtained.

[0037]

According to the present invention, there is provided a vibration damping device having a novel structure in which a gap between an outer cylinder and an inner cylinder whose both ends are connected by viscoelasticity is filled with a viscous material. This vibration damping device can use the damping force due to the resistance force of the viscous body when flowing and the damping force due to the shear deformation of the sealing member, and can effect a wide range of vibrations from relatively large amplitude vibrations to minute vibrations. Can be suppressed. In addition, by using an elastic body or a viscoelastic body as the seal member, precise machining for sealing the viscous body is not required, and a vibration damping device having a simple configuration and sufficiently high damping performance can be obtained. . Further, the vibration damping device of the present invention can provide a vibration damping device in which a change in damping performance due to a temperature change is small by using a silicone rubber-based material as a viscoelastic body and using silicone oil as a viscous body.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a vibration damping device according to the present invention.

FIG. 2 is a diagram showing one embodiment of a method of manufacturing a vibration damping device of the present invention.

FIG. 3 is a sectional view showing another embodiment of the vibration damping device of the present invention.

FIG. 4 is a sectional view showing another embodiment of the vibration damping device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vibration suppression device 1 ... Outer cylinder 2 ... Inner cylinder 21 ... Inner cylinder convex part 21a ... Through-hole 3, 4 ... Seal member 5 ... Viscous body

Continuation of the front page (72) Inventor Tetsuro Retirement 2-1-1, Oda Ei, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Showa Electric Wire & Cable Co., Ltd. 3J048 AA02 AC04 BA23 BD08 BE04 EA38 3J069 AA39 BB01 BB10 5D061 GG01 GG05

Claims (6)

[Claims] 1. An outer cylinder having an outer diameter smaller than the inner diameter of the outer cylinder, wherein an inner cylinder disposed in the outer cylinder is axially separated from the outer cylinder. A sealing member made of an elastic body or a viscoelastic body that seals at least two places, an inner surface of the outer cylinder, a viscous body filled in a space surrounded by the outer surface of the inner cylinder and the sealing member, A vibration damping device comprising: a restriction unit configured to restrict movement of the viscous body. 2. The vibration damping device according to claim 1, wherein the control means is at least one inner cylinder protrusion formed integrally with the inner cylinder and protruding in a radial direction of the inner cylinder. 3. The vibration damping device according to claim 2, wherein the inner cylinder convex portion has an axial through hole that allows the viscous body to flow. 4. The method according to claim 1, wherein the sealing member has an equivalent damping constant (he
q) The vibration damping device according to any one of claims 1 to 3, wherein the vibration damping device is made of a viscoelastic material of 0.2 or more. 5. The vibration damping device according to claim 1, wherein the viscoelastic body is a silicone rubber. 6. The vibration damping device according to claim 1, wherein the viscous body is a silicone oil or a silicone oil compound.