JP2000017885A - Damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damping device displaying a large damping effect by a simple small-sized constitution. SOLUTION: The damping device consists of first and second connecting members 10, 20 mutually joined in a relatively displaceable manner, and the first connecting member 10 is composed of a guide nut 14, in which a guide screw section 10a is formed on the connection side and which is engaged with the guide screw section, and a rotary internal cylinder 16, in which one end section is fixed to the guide nut 14 and the other end section is formed in an internal cylindrical shape as an opening end. The second connecting member 20 is made up of the rotary internal cylinder 16 and a fixed external cylinder 24, in which the guide nut 14 is housed, and a slender body 60 having an outside diameter smaller than the hollow-section inside diameter of the rotary internal cylinder 16 and being extended along the axial direction up to a place having an opening with the guide screw section 10a is installed at the center of the fixed external cylinder 24, and an opening between the fixed external cylinder 24 and the rotary internal cylinder 16 and an opening between the rotary internal cylinder 16 and the slender body 60 are filled with a viscous body 26 for damping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping device used for a base-isolated structure or the like for damping energy such as an earthquake, and more particularly to a damping device having a simple structure, a small size and a large damping effect.

[0002]

2. Description of the Related Art In general, a damping device is mounted between two points (objects) that are relatively displaced, and converts vibration energy transmitted from one vibration source side to the other vibration damping object side into heat energy and disappears. To achieve the damping effect.

[0003] The above-mentioned general damping device accommodates a relative displacement portion generated by vibration in a viscous chamber formed in the device, so that a damping effect is obtained by utilizing the viscous friction resistance. Are configured to achieve
In this case, the relative displacement amount of the relative displacement portion is configured to be amplified via an amplifying means from the actual displacement amount (displacement amount between two relatively displaced points). Therefore, the damping effect can be increased. Incidentally, the damping effect is proportional to the first power of the facing area between the two parts that perform relative displacement (movement) and the α power of the relative speed.

[0004]

However, the above-mentioned conventional damping device has the following drawbacks. That is, the conventional damping device is, as described above,
It is common to have a means for amplifying the relative displacement portion, but this displacement amplifying means usually comprises lever means connected by a hinge joint mechanism. Such lever means has the disadvantage that the amplification magnification (the ratio of increase in the facing area between the relative displacements and the relative speed) is not sufficient, and the structure is complicated, the damping device becomes large, and the operating accuracy is reduced. I was Further, in this type of damping device, there is a damping device having a small damping effect because the central portion of the viscous body in the viscous body chamber is not used.

Accordingly, an object of the present invention is to provide a displacement amplification means which can achieve a large amplification factor with a simple and compact configuration, that is, to obtain a large displacement amplification factor with a simple and small configuration, and to provide a viscous material at the center. By using
An object of the present invention is to provide a damping device exhibiting a large damping effect.

[0006]

In order to achieve the above object, a damping device according to the present invention comprises first and second connecting members connected to each other so as to be relatively displaceable.
A guide screw portion is formed at least on the connection side of the connecting member, and the guide member is engaged with the guide screw portion and is rotatably slid on the guide screw portion based on relative displacement with the guide screw portion. A nut, a cylindrical inner rotating cylinder having a diameter larger than the guide screw portion and having an axial length sufficiently larger than the diameter, one end of which is fixed to the guide nut, and the other end of which is an open end; The second connecting member is composed of a fixed outer cylinder that houses the rotating inner cylinder and the guide nut, and at least a gap between the inner wall of the fixed outer cylinder and the rotating inner cylinder is filled with a viscous material for damping. It is a damping device, having an outer diameter smaller than the inner diameter of the hollow portion of the rotating inner cylinder at the center of the fixed outer cylinder, and along the axial direction to a position having an interval with the guide screw portion when the guide nut rotates. With elongated body extending Together, characterized in that to fill the viscous body for attenuation in the gap between the inner wall and the elongated body of the rotating inner cylinder.

In this case, the elongated body may be constituted by a cylindrical rod or a polygonal rod, or a projection may be provided on the surface of the elongated body. The above-mentioned damping device is configured to be disposed between the opposing corners of the structural frame in the building structure or between the foundation in the building structure and the building structure on the foundation so as to be compressible or tensionable. Is also good.

[0008] In the damping device according to the present invention, the displacement amplifying means is formed of a rotating inner cylinder which is rotatably slid with a guide nut screwed into a guide screw portion of the first connecting member. Therefore, the relative speed increase ratio N of the displacement amplifying means is given by the following equation: N = πD / р where p is the thread pitch of the guide screw portion D is the outer diameter of the rotating inner cylinder, and p and D are set to appropriate values. By setting, the size can be appropriately selected. If p and D are set to 2 and 10 cm, N is amplified 15.7 times. In this case, when the damping device is used as a brace in a 45-degree direction, the N is further amplified by 22.2 times.

Also, the above-mentioned opposed area A for relative displacement can be similarly set to a sufficient size by setting the outer diameter D and the length L of the rotary inner cylinder to appropriate values. . Further, the opposing area of the hollow portion of the rotating inner cylinder and the elongated body can exhibit a greater damping effect. Note that the damping effect of the damping device achieved by these will be described in more detail in the embodiments described later. Moreover, since the displacement amplifying means is a screw-nut mechanism, it can be configured simply and compactly. That is, the damping device according to the present invention can be simply and small-sized due to its excellent characteristics,
A sufficiently large damping effect can be exhibited.

Next, an embodiment of the damping device according to the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, a damping device 50 according to the present invention has two points L which are relatively displaced.
The first and second connecting members 10 and 20 are connected to each other so as to connect the first and second connecting members L1, L2.
Respectively. The first connecting member 10 includes:
A guide screw portion 10a is formed on the connection side. On this screw portion 10a, a guide nut 14 screwed via a ball bearing 12 and a diameter larger than the guide screw portion 10a and sufficiently larger than this diameter are provided. A rotating inner cylinder 16 having an axial length, one end of which is fixed to the guide nut 14 and the other end of which is an open end.

The second connecting member 20 has a connecting side connected to a chamber 22 for accommodating the rotating inner cylinder 16 and the guide nut 14.
The elongated body 60 extends in the center of the fixed outer cylinder 24 along the axial direction, and the chamber 22 is filled with the damping viscous body 26. The elongated body 60 has an outer diameter smaller than the inner diameter of the hollow portion of the rotating inner cylinder 16 and, when the guide nut 14 rotates, the guide screw portion 1.
0a and a position having an interval 61. Damping device 5
0 has a substantially cylindrical shape as described above, and may be referred to as a damping bar.

The rotating inner cylinder 16 has one end fixed to the guide nut 14 and the other end open. The guide nut 14 is fixed to the open end of the fixed outer cylinder 24.
2, and ball bearings 28 and 30 are disposed on both upper and lower contact surfaces of the casing 32, respectively. For this reason, the rotating inner cylinder 16 rotates on the guide screw portion 10a via the guide nut 14 and moves in the vertical direction in the drawing in response to both the compressive and tensile loads generated from the relative displacement between the two points L1 and L2. It is supported so as to slide.

Hereinafter, the damping effect of the damping device of the present invention will be described in detail. In the schematic explanatory view (FIG. 2) and the schematic cutaway sectional view (FIG. 3) in which the damping device 50 is arranged between the two points L1 and L2 of the building structure 72, the predominant (basic) vibration of the building structure Number n (Hz) Axial deformation of damping device 50 (maximum) d (cm) Screw pitch of guide screw portion 10a p (cm) Number of rotations within one-half amplitude time Δt (= １ ／ n) m = d / p rotation Number of rotations of the inner cylinder 16 (for one second) f = 2dn / p Outer diameter of the elongated body 60 D _H (cm) Inner diameter of the rotating inner cylinder 16 D _K (cm) Length L of the facing portion between the rotating inner cylinder 16 and the elongated body 60 L (Cm) Assuming that the surface area of the portion of the inner surface of the rotating inner cylinder 16 facing the elongated body 60 is A = πD _H L, the angular velocity ω (rad / se
c) is given by the following equation (1), ω = 2πf = 4πdn / p (1), and the inner peripheral velocity v (cm / se
c) is represented by the following equation (2) and v = 2πdnD _K / p (2), respectively. In such a damping device, the damping force Qd (kg) by the viscous body is generally expressed by the following equation (3): Qd = a · μ · (dv / dy) ^α · A (3) where a: coefficient μ: viscosity Body viscosity (kg · sec / cm ² ) dv: Velocity difference (cm / sec) between two surfaces (the inner surface of the rotating inner cylinder 16 and the outer surface of the elongated body 60) dy: Two surfaces (the inner surface of the rotating inner cylinder 16 and the elongated body 60) Aperture (cm) A: Since it is given by the facing area (cm ² ) between two surfaces (the inner surface of the rotating inner cylinder 16 and the outer surface of the elongated body 60), the damping force per unit clearance (1 cm) is given by the above equation. can be calculated from the formula (2) formula obtained by substituting the (3) (4) Qd = a · μ · a · (2πdnD K / p) α (4).

Here, as experimental results, the following approximate values a: 0.0843 (μ30) ^−0.483 (where ^μ30 is the viscosity of the viscous material at a temperature of 30 ° C.) μ: 7.1 ( ^μ30 ) ^0.88 · e− ^{0.07 t} (where t is temperature (° C.)) α: 0.94 is obtained, that is, the following equation (5) is obtained as a simplified relational equation.

(Equation 1) Has been obtained. From the above (1) and (2), suppose n = 1 (Hz) d = 5 (cm) p = 0.5 (cm) _DK = 10 (cm) _DH = 8 (cm) L = 100 (cm) dy = 1 (cm) μ30 = 100 poise = 1 / (9.8 × 10 ³ ) (kg · sec)
/ Cm ²⁾ t = 20 (When ° C.), i.e. f = 2dn / p = 20 ( rps) A = πD H L = π × 8 × 100 = 2513 (cm 2) v = 2πdnD K / p = 2 × π × 5 × 1 × 10 / 0.5
= 628 (cm / sec), the damping force Qd is calculated by the above equation (5).
Is calculated as follows.

[0015]

(Equation 2) That is, according to the damping device of the present invention in which the elongated body 60 is axially extended inside the rotary inner cylinder 16, a large damping force of about 3.2 ton is obtained by using the elongated body having a diameter of 8 cm and a length of the opposing portion of 100 cm. It can be seen that it can be obtained. In the conventional damping device, the viscous body at the center is stationary, and this damping force is not used.

Here, the damping force generated between the opposing surfaces of the inner surface of the rotating inner cylinder 16 and the inner surface of the fixed outer cylinder 24 under the same conditions as above will be calculated. The surface area of the facing portion between the outer surface of the rotating inner cylinder 16 and the inner surface of the fixed outer cylinder 24 is represented by A '
v ′ Length of the facing portion between the rotating inner cylinder 16 and the fixed outer cylinder 24 L ′ Assuming that the outer diameter of the rotating inner cylinder is D, L ′ = 100 (cm) and D = 10 (cm), A ′ = πDL ′ = π × 10 × 100 = 3141 (cm ² ) v ′ = 2πdnD / p = 2 × π × 5 × 1 × 10 / 0.5
= 628 (cm / sec) dy ': 2 surfaces (the inner surface of the fixed outer cylinder 24 and the outer surface of the rotating inner cylinder 16)
If dy '= 1 (cm), the damping force is calculated from equation (5) as follows.

[0017]

(Equation 3) Thus, a large damping force of about 4 tons can be obtained.

As described above, in the above-described damping device, a large damping force of about 4 tons is obtained by the viscous material between the outer surface of the rotating inner cylinder 16 and the inner surface of the fixed outer cylinder 24. Further, the elongated body 60 of the present invention is obtained. By extending in the axial direction, a total damping force of about 7.2 tons can be obtained.

As described above, according to the damping device according to the present invention, a simple and small configuration for converting the linear displacement of the screw portion into a rotary motion can provide an extremely large damping effect as compared with a conventional damping device of this kind. It can be easily achieved. In addition, this damping device has an advantage that it can be applied relatively easily regardless of the size of the structure and can be applied to both compressive and tensile loads.

The elongated body extending in the axial direction of the damping device 50 according to the present invention can be variously modified, and modifications thereof will be described below. The embodiment shown in FIG. 4A shows an example of an elongated body 62 formed from a hexagonal prism rod as a polygonal prism. The modification shown in FIG. 4B is an elongated body 64 in which a projection 66 is formed on the surface of an elongated body 60 covered by the rotating inner cylinder 16 in the embodiment shown in FIG. It is apparent that the same operation and effect as those of the previous embodiment can be achieved in these two embodiments.

Further, as described above, the damping device according to the present invention is widely applied to both relatively large structures and small assemblies. Next, an example in which the damping device according to the present invention is applied to a building structure will be described below.

In the application example of FIGS.
Is a connecting member 1 between mounting plates 74a and 74b at opposite corners of the structural frame 74 of the building structure 72.
It is arranged so that it can be compressed and pulled via 0,20. Accordingly, the strain energy in the structural frame 74 is absorbed by the damping effect of the damping device 50 which expands and contracts due to the strain displacement of the structural frame 74 generated by an earthquake or the like, and the vibration of the building structure 72 is effectively damped. Can be done. As described above, according to the damping device according to the present invention, as described above, the damping device can be simply and small-sized, and can exhibit a sufficiently large damping effect.

In the application example of FIG. 8, the damping device 50 includes a base 76 and a base isolation pad 78, 78 on the base 76.
And the building structure 80 supported via the support columns 76a and 80a so as to be compressible and tensile. Therefore, due to the relative displacement in the horizontal direction between the foundation 76 and the building structure 80 generated by an earthquake or the like, the damping effect of the damping device 50 expanded and contracted,
The horizontal relative displacement energy between the foundation 76 and the building structure 80 is absorbed, and the vibration of the building structure 80 is effectively attenuated.

Although the present invention has been described with reference to a preferred embodiment, the present invention is not limited to the above-described embodiment.
Many modifications can be made without departing from the spirit thereof. For example, the slender body shows an example of a cylindrical rod,
It may be constituted by a pipe-shaped rod, and the ball bearing in the damping device may be appropriately changed to another bearing means.

[0025]

As described above, the damping device according to the present invention comprises the first and second connecting members which are connected to each other so as to be relatively displaceable, and the first connecting member is provided at least on the connection side thereof. A guide nut engaged with the guide screw and rotatably slidable on the guide screw based on relative displacement with the guide screw; and a guide nut larger than the guide screw. A rotation having a diameter and an axial length sufficiently larger than this diameter, the other end being an open end, one end being fixed to the guide nut and being rotatably slidably inserted through the guide nut. The second connecting member is composed of a fixed outer cylinder that houses the rotating inner cylinder and the guide nut, and the inner surface of the fixed outer cylinder includes:
The elongated body extends in the axial direction and is covered with the hollow portion of the rotating inner cylinder, and at least a gap between the inner wall of the fixed outer cylinder and the rotating inner cylinder, and a gap between the inner wall of the rotating inner cylinder and the elongated body, It was configured to be filled with a viscous material. That is, in the damping device of the present invention, since the damping mechanism is configured to convert the linear displacement of the guide screw portion into the rotational sliding motion of the rotating inner cylinder, the displacement conversion magnification (relative speed increase ratio and the like). But,
It is greatly increased compared to conventional devices of this kind. Therefore, according to the damping device of the present invention, it is possible to easily achieve a large damping effect with a simple and small configuration.

When the damping device according to the present invention is disposed between the opposing corners of the structural frame of the building structure so as to be able to be compressed or pulled, the damping device can be constructed simply and compactly as mentioned above, Since it is possible to exert a great damping force, it is possible to efficiently attenuate vibrations and the like of the building structure. Further, when the damping device according to the present invention is disposed between a foundation in a building structure and a structure on the foundation so as to be able to be compressed or pulled, the damping device is configured simply and compactly as described above. Together with a sufficient damping force, vibrations and the like between the foundation and the building structure can be efficiently damped.

[Brief description of the drawings]

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

FIG. 2 is a schematic explanatory view in which the damping device according to the present invention is disposed so as to be installed between two positions of a building structure.

FIG. 3 is a partially cutaway sectional view in FIG. 2;

FIG. 4A is a perspective view of an embodiment of an elongated body formed of a polygonal rod, and FIG. 4B is a perspective view of another embodiment in which a projection is provided on an elongated body formed of a cylindrical rod. It is.

FIG. 5 is a diagram showing a space between opposed corners of a structural frame in a building structure.
It is a schematic front view at the time of applying the damping device concerning this invention.

FIG. 6 is an enlarged view of a portion A in FIG.

FIG. 7 is an enlarged view of a portion B in FIG.

FIG. 8 is a schematic configuration diagram in a case where the damping device according to the present invention is applied between a foundation and a building structure in the building structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st connection member 10a Guide screw part 12 Ball bearing 14 Guide nut 16 Rotating inner cylinder 20 2nd connection member 22 Chamber 24 Fixed outer cylinder 26 Viscous body 28, 30 Ball bearing 32 Casing 50 Damping device 60, 62, 64 Slender body 61 Spacing 66 Projection 72 Building structure 74 Structural frame 76 Foundation 78 Seismic isolation pad 80 Building structure

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J048 AA05 AB01 AC01 BE04 CB21 EA38 3J069 AA69 DD47 EE35

Claims (5)

[Claims] 1. A vehicle comprising a first and a second connecting member connected to each other so as to be relatively displaceable, the first connecting member comprising:
A guide nut formed at least on a connection side thereof, the guide nut being engaged with the guide screw and rotatably slidable on the guide screw based on a relative displacement with the guide screw; A cylindrical rotating inner cylinder having a diameter larger than the threaded portion and having an axial length sufficiently larger than this diameter, one end of which is fixed to the guide nut, and the other end of which is an open end; The connecting member of No. 2 is a damping device including a fixed outer cylinder that houses the rotating inner cylinder and the guide nut, and at least a gap between the inner wall of the fixed outer cylinder and the rotating inner cylinder is filled with a viscous material for damping. An elongated shape having an outer diameter smaller than the inner diameter of the hollow portion of the rotating inner cylinder at the center of the fixed outer cylinder, and extending along the axial direction to a position having a distance from the guide screw portion when the guide nut rotates. Have body and rotate A damping device characterized by filling a gap between an inner wall of an inner cylinder and the elongated body with a viscous body for damping. 2. The damping device according to claim 1, wherein the elongated body is formed of a cylindrical rod or a polygonal rod. 3. The attenuation device according to claim 1, wherein a projection is provided on the surface of the elongated body. 4. The damping device according to claim 1, wherein the damping device is arranged between the opposite corners of the structural frame in the building structure so as to be able to be compressed or pulled. 5. The damping device according to claim 1, wherein the damping device is disposed between the foundation in the building structure and the building structure on the foundation so as to be capable of being compressed or pulled.