JP2003138784A - Damping top - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper used as an earthquake damping device such as a construction structure capable of inexpensively damping a vibration by effectively using a prescribed space. SOLUTION: This damping top is composed of an outer cylindrical pipe and a screw shaft mutually connected so as to be relatively displaceable, and has a guide nut rotatably and pivotally supported by the screw shaft on the inside of the outer cylindrical pipe, and an inner cylindrical pipe fixed to the guide nut, and fills a viscous body and/or a viscoelastic body in clearance between the outer cylindrical pipe and the inner cylindrical pipe, and is characterized in that the outer cylindrical pipe is connected to a V brace joined to an upper beam, and the screw shaft is arranged by respectively joining both end parts to two stoppers projected on a lower beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping top used as a vibration control device for construction structures and the like.

[0002]

2. Description of the Related Art In general, a damping mechanism used as a vibration control device is mounted between two points (2 objects) that are relatively displaced, and it is installed from one vibration source side such as a foundation to the other damping object which is an upper structure. It is configured to achieve a damping effect by converting the vibration energy transmitted to the side to heat energy and disappearing.

The damping mechanism described above is constructed so that a relative displacement portion generated by vibration is accommodated in a viscous body chamber formed in the apparatus, and a damping effect is achieved by viscous frictional resistance of the viscous body. In this case, the displacement amount of the relative displacement portion is the same as the actual displacement amount (the displacement amount between two points that are relatively displaced), or is amplified through the amplifying means. Then, the damping effect can be increased by amplifying the displacement amount. The viscous damping force is proportional to the relative velocity of the viscous body with respect to the displacing member.

For example, the details thereof have already been proposed by the applicant in JP-A-10-184757.

[0005]

However, the conventional damping mechanism is joined to the foundation through the pin joint. This pin joint has two problems.

That is, the first point is that the production cost of the pin joint is high. Therefore, the use of pin joints adds to the overall cost.

The second point is that the axial length of the pin joint is long. The damping mechanism is composed of a pin joint that does not directly have a damping effect and a viscous body chamber that has a damping effect. For this reason, the longer the length of the pin joint, the lower the damping effect in the damping mechanism having the same length. Therefore, even if a viscous body chamber having a minimum required length for obtaining a damping effect is prepared, the damping mechanism may not fit in a predetermined space because the pin joint is long.

Further, conventionally, the shaft portion is provided only on one side, and the viscous chamber cannot be moved a sufficient distance in some cases because the shaft length cannot be sufficiently obtained.

Therefore, an object of the present invention is to provide a damping device which is effectively used in a predetermined space and is used as a vibration control device for a construction structure or the like having a low manufacturing cost.

[0010]

In order to achieve the above object, a damping top according to the present invention comprises an outer cylinder tube and a screw shaft connected to each other so as to be capable of relative displacement, and the inner side of the outer cylinder tube. A guide nut rotatably supported by the screw shaft and an inner cylinder pipe fixed to the guide nut, and a viscous body and / or viscoelastic material is provided in a gap between the outer cylinder pipe and the inner cylinder pipe. In a body-filled damping top, the outer tube is connected to a V-breath that is connected to an upper beam, and the screw shaft is arranged such that both ends thereof are respectively connected to two stoppers projecting on the lower beam. It is characterized by being done.

Further, the screw shaft is provided with a screw groove in the center thereof, and the guide nut is guided by fitting a ball bearing inside the guide nut and engaging the ball bearing with the screw groove. It is characterized in that the nut is configured to be rotatable and axially movable.

The outer tube may be held at both ends by ball bearings rotatable on the screw shaft, and grooves may be formed at the ends of the screw shaft to engage with the ball bearings.

In addition, the outer tube may be provided with rotatable ball bearings joined to the screw shaft at both ends thereof.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the attached FIG.

The damping top 1 according to the present invention is provided between the stoppers 4 and 6 provided on the lower beam 2, and is further coupled to the upper beam 8 via the V-bress 10 so that the damping frame 1 can be moved in the left-right direction in the drawing. It is configured to damp the vibrations of the lower beam 2 and the upper beam 8.

This damping device is composed of a first element which is integrally connected to the upper beam 8 and is movable in the left-right direction in the drawing, and a first element which is integrally connected to the upper beam 8 and is movable in the left-right direction in the drawing and is a stopper. The third element is composed of a second element that is rotatable about a screw shaft 12 provided between Nos. 4 and 6, and a third element that is integrally connected and fixed to the lower beam 2.

The first element is a V-breath 10 having a V-shaped upper portion coupled to the upper beam 8 via each flange 14, a bracket 16 provided at the bottom of the V-breath 10, and a fixing coupling to the bracket 16. The part 18 and the fixing part 18 are fixed to the bracket 16 and the longitudinal direction thereof is V.
It is integrally configured with the outer cylinder tube 20 of the damping top 1 arranged so as to be in the same direction as the V-shape of the breath 10.

The second element is an inner cylinder tube 24 disposed inside the outer cylinder tube 20 and supported by a ball bearing 22 on the outer periphery of the screw shaft 12, and the front and rear sides of the inner cylinder tube 24 are sandwiched by the inner cylinder tube 24. The guide nut 30 is supported by the thrust bearing 26 and engages with the screw shaft 12 via a ball bearing 28 that is built in in advance, and is rotatably arranged on the screw shaft 12. Also,
A viscous body 32 and / or a viscoelastic body are provided between the outer cylindrical tube 20 and the inner cylindrical tube 24. A highly viscous fluid such as polyisobutylene can be preferably used for the viscous body 32 and / or the viscoelastic body. Further, ball bearings 34 are arranged at both outer ends of the outer tube 20, and engage with the screw shaft 12.

The third element is a first stopper 4 provided on the lower beam 2, a first connecting member 36 fixed to the stopper, and an end portion at the center of the first connecting member 36. And a screw shaft 12 in which screw grooves having different pitches are formed on both ends 37 and the center 39, respectively, and the screw shaft 12
The second connecting member 38 for fixing the opposite end portion thereof and the second stopper 6 for fixing the second connecting member 38 are integrally configured. The second stopper 6 is fixed to the lower beam 2.

In the present invention having the above-mentioned structure, the operation of the present invention will be described on the assumption that an earthquake vibrating in the horizontal direction of FIG. 1 has occurred.

First, the first stopper integrally formed with the lower beam 2 by the vibration from the left to the right causes the first connecting member 3 to move.
The screw shaft 12 is pressed in the right direction via 6. In response to this pressing, the first element and the second element arranged via the first element and the viscous body 32 are maintained by the inertial force.
Therefore, the third element is displaced with respect to the first and second elements. The speed of this displacement is amplified by the screw shaft 12 and the guide nut 30.

When the displacement velocity is amplified, the viscous damping force is amplified in proportion to the velocity increase. As described above, according to the damping device of the present invention, the linear displacement of the screw shaft 12 is reduced
The inner cylinder tube 24 with a simple and compact structure that can be converted into the rotational movement of
The velocity can be amplified, and a large viscous damping force can be easily obtained. In particular, since the pin joint is not used, it is possible to shorten the length of the damping device by shortening the length of the first connecting member. In addition, since both ends of the guide nut are the inner tube 24, the ratio of the length of the rotating portion to the entire damping device can be increased, so that the device can be made compact.

Next, FIG. 2 shows a second embodiment of the damping device according to the present invention. The same parts as in the first embodiment are omitted,
Differences from the first embodiment will be described.

The first element is the same as in the first embodiment.

The second element is provided with ball bearings 40 at both outer ends of the outer tube 20 and supports a screw shaft 42.

The third element is provided with a screw shaft 42 having a thread groove only in the center thereof and a PL 44 on the lower beam 2.
Further, a linear rail 46 is arranged on the PL 44, and a linear block 48 provided at the bottom of the outer tube 20 is guided.

By reducing the thread groove of the screw shaft 42, the working process is reduced and the cost is reduced.

Further, since the linear block 48 is guided by the linear rail 46, it has an effect of suppressing the vibration in the vertical direction in FIG.

[0029]

According to the present invention, it is possible to provide a damping device used as a vibration control device for a construction structure or the like, which effectively utilizes a predetermined space to reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a damping top according to the present invention.

FIG. 2 is a side view showing a second embodiment of the damping top according to the present invention.

[Explanation of symbols]

1 damping top 2 Lower beam 4, 6 stopper 8 Upper beam 10 V breath 12 screw shaft 14 Flange 16 brackets 18 Fixed part 20 Outer tube 22 ball bearings 24 Inner tube 26 Thrust bearing 28 ball bearings 30 guide nut 32 Viscous body 34 ball bearing 36 First Connection Member 37 Threaded groove on both ends 38 Second Connection Member 39 central thread groove 40 ball bearing 42 screw shaft 44 PL 46 linear rail 48 linear blocks

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Chiaki Kagomiya             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Hidenori Kida             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation F-term (reference) 3J048 AA05 AB01 AC04 BE04 DA01                       EA38                 3J069 AA69 CC34

Claims (5)

[Claims] 1. A guide nut comprising an outer cylinder tube and a screw shaft connected to each other so that they can be displaced relative to each other, and a guide nut rotatably supported by the screw shaft inside the outer cylinder tube, and fixed to the guide nut. And a viscous body and / or a viscoelastic body are filled in a gap between the outer tubular tube and the inner tubular tube, the outer tubular tube being connected to an upper beam. A damping top, wherein the screw shaft is arranged such that both ends of the screw shaft are connected to two stoppers projecting from the lower beam, respectively. 2. The screw shaft has a thread groove formed in the center thereof, and the guide nut is guided by fitting a ball bearing inside the guide nut and engaging the ball bearing with the thread groove. The damping top according to claim 1, wherein the nut is configured to be rotatable and axially movable. 3. The lower beam is provided with a linear rail arranged in parallel with the outer tubular tube on the upper part thereof, and the outer tubular tube is provided with a linear block guided by the linear rail. The damping top according to any one of 1 to 2. 4. The outer tube is sandwiched by rotatable ball bearings that are joined to a screw shaft at both ends thereof, and grooves are formed at the ends of the screw shaft to engage with the ball bearings. The damping top according to any one of claims 1 to 3. 5. The outer cylinder tube is provided with rotatable ball bearings joined to the screw shaft at both ends thereof.
The damping top according to any one of 1 to 3.