JPH09229121A - Liquid damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the seal structure between a piston and a cylinder and supply a liquid damper at a low cost. SOLUTION: Each cylinder unit 10 is equipped with a rubber diaphragm 12 inside a cylinder 11, and the lower part serves as a liquid chamber 14. In this chamber, a working liquid A such as oil, water, etc., is accommodated, and liquid chambers 14 of two cylinders 11 are put in communication through a thin communication pipe. A small gap is reserved between the peripheral surface of the piston 17 and the inside surface of the cylinder 11, and on the diaphragm a high viscosity substance B is put so as to fill the gap without voids. The cylinder units 10 in a couple are arranged in a structure so that their pistons 17 make counter-movement in the push and pull in association with vibration of the structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid damper used for suppressing vibration of a large structure such as a building.

[0002]

2. Description of the Related Art Various types of dampers are used to suppress vibration of structures. Among them, liquid dampers such as oil dampers are small and have high resistance.
There is an advantage that a damping force that increases in proportion to the speed or nonlinearly can be obtained.

On the other hand, in order to push the liquid into a narrow orifice or a narrow pipe by a high internal pressure, a strict sealing mechanism is required in the gap between the piston and the cylinder, and extremely precise machining is required for installing packing and bearings. Required and expensive equipment. Liquid dampers are expensive and practically difficult to use due to the large number of dampers required in large structures such as buildings.

[0004]

SUMMARY OF THE INVENTION The present invention simplifies the seal structure between a piston and a cylinder in a liquid damper and eliminates the need for precision machining, so that the liquid damper can be supplied at a low cost. With the goal.

[0005]

The liquid damper of the present invention comprises a cylinder unit incorporated in a structure so that the cylinder reciprocates due to the vibration of the structure.
There may be a single damper or a connected damper depending on whether the cylinder unit is one or two.

In the case of the connection type damper, the inside of the two cylinders communicates with each other through a flow passage (connection pipe) having a limited cross-sectional area, and when one piston pushes, the other pulls. Incorporated into. In the case of a stand-alone damper, a working fluid storage tank is provided, and when the piston is pushed into the cylinder, the working fluid in the cylinder is pushed out to the working fluid storage tank through the flow passage with a limited cross-sectional area, and the piston is pushed out of the cylinder. When retracted, the working liquid in the working liquid reservoir is configured to be sucked into the cylinder through the flow path having the large cross-sectional area.

In the present invention, a viscous substance is filled in the gap between the inner surface of the cylinder and the piston of these linked or independent dampers for sealing. If necessary, the viscous substance and the working liquid can be separated from each other by a stretchable diaphragm made of rubber or the like so as not to mix with each other.

In the case of a stand-alone damper, the skirt is provided on the piston and the skirt is used as a working liquid storage tank.
If the piston shaft extending from the piston is formed hollow and used as a working liquid storage tank, the whole becomes very compact and easy to use.

If a stopper is provided on the piston and the stopper abuts against the cylinder when the piston is excessively displaced, excessive displacement of the structure can be prevented. In this case, install a cushion material on the collision surface,
Try to reduce the impact caused by the collision between the stopper and the cylinder.

[0010]

The operation of the damper according to the present invention will be described with reference to the connection type. When the piston of the first cylinder unit of the two cylinder units pushes and the piston of the second unit moves in the pulling direction. The piston of the first cylinder unit pushes the working liquid in the liquid chamber,
Conversely, the piston of the second unit sucks up the working liquid in the liquid chamber, so that the working liquid moves from the first cylinder to the second cylinder through the connecting pipe.

With the movement of the working liquid, a liquid flow resistance acts on the small-diameter connecting pipe, so that a high positive pressure is generated in the first cylinder and a negative pressure below atmospheric pressure is generated in the second cylinder. . The internal pressure generated in the cylinder acts as a pushing / pulling resistance force on the piston.

At this time, pressure acts on the viscous substance in the gap between the piston and the inner surface of the cylinder, but since the viscous substance has a high viscous resistance and the pressure is a dynamic pressure that acts in a short time, The viscous substance filled in the gap hardly moves, and the pressure inside the cylinder is sealed by the viscous substance.

On the other hand, when the piston moves from the neutral position, the viscous substance filled in the gap between the piston and the cylinder undergoes dynamic shear deformation, so that shear resistance is generated due to the viscosity of the material, and the viscous substance due to shearing is generated in the piston. Resistance acts.

When the displacement direction of the piston reverses due to the vibration of the structure, the direction of the liquid flow in the connecting pipe and the direction of the shear deformation of the viscous substance also reverse, and the piston is in the opposite direction to that described above. Resistance is generated.

As described above, when the structure vibrates, a resistance force is generated in each cylinder unit, which is the sum of the internal pressure resistance due to the oscillating flow in the connecting pipe and the viscous resistance due to the shear deformation of the viscous substance. It is transmitted and acts as a vibration damping force.

When the liquid flow in the connecting pipe becomes high speed and becomes turbulent, the resistance increases in proportion to almost 1.75th power of the speed.
The damping force of the liquid damper is strong against high-frequency and large-amplitude vibrations, but has a drawback that it is ineffective against low-frequency and small-amplitude vibrations. However, the resistance due to the shear deformation of the filled viscous body is large for low-frequency and minute-amplitude vibrations and low for high-frequency vibrations. There will be a side benefit of making up for the shortcomings of liquid dampers in.

[0017]

EXAMPLE First, an example of a connection type damper composed of two cylinder units will be described. As shown in FIG. 1, in each cylinder unit 10, a rubber diaphragm 12 is stretched inside a cylinder 11, and the liquid chamber 1 is located below the diaphragm 12.
It is four. A working liquid A such as oil or water is contained in the liquid chamber, and the liquid chambers 14 of both cylinders 11 are connected by a connecting pipe 15 having a small diameter. A slight gap is maintained between the outer periphery of the piston 17 and the inner surface of the cylinder 11, and a viscous substance B having a high viscosity is filled in the upper side of the diaphragm so as to fill the gap. The surface of the viscous substance B is covered with a rubber film 1 to prevent dust.

A pair of these two cylinder units 10
Are incorporated in the structure, and at that time, the pistons 17 are arranged in the structure such that the respective pistons 17 push and pull in opposite directions in accordance with the vibration of the structure.

The operation of this damper will be described with reference to FIG. As shown in FIG. 7A, when the piston 17 of the left cylinder unit pushes and the right piston 17 moves in the pulling direction, the piston of the left damper moves the viscous substance B and the rubber below the piston. The working liquid A in the liquid chamber is pushed downward through the respective diaphragms 12, and conversely, the right cylinder unit sucks the working liquid in the liquid chamber upwards via the viscous substance below the piston and the rubber diaphragm.
The working liquid A moves from the left cylinder to the right cylinder through the connecting pipe 15. Along with the movement of the working liquid, liquid flow resistance acts on the small-diameter connecting pipe 15, so that a high positive pressure is generated in the left cylinder and a negative pressure below atmospheric pressure is generated in the right cylinder. The internal pressure generated in the cylinder acts as a pushing / pulling resistance force on the piston.

At this time, the piston 17 and the cylinder 11
The pressure p as shown in the figure acts on the viscous substance B in the gap on the inner surface, but since the viscous substance B has a high viscous resistance and the pressure p is a dynamic pressure that acts in a short time, The viscous substance filled in the gap hardly moves, and the internal pressure of the cylinder is sealed by the viscous substance B.

On the other hand, the piston 17 from the neutral position is shown in FIG.
When moving to the position shown in (b), the viscous substance B filled in the gap between the piston and the cylinder undergoes dynamic shear deformation as shown in the same figure, and therefore shear resistance is generated due to the viscosity of the material, and the piston A viscous resistance force due to shearing acts on the sheet.

When the direction of displacement of the piston is reversed due to the vibration of the structure, the direction of liquid flow in the connecting pipe and the direction of shear deformation of the viscous substance are also reversed, and the direction opposite to that described above is applied to the piston. Resistance is generated.

When the structure vibrates in this way, a resistance force is generated in each cylinder unit, which is the sum of the internal pressure resistance due to the oscillating flow in the connecting pipe and the viscous resistance due to the shear deformation of the viscous substance. It is transmitted and acts as a vibration damping force.

When the object of vibration control by the damper is a flexible structure having a small spring constant, it is necessary to limit displacement of the structure caused by vibration so as not to be excessive. To this end, in the present damper, as shown in FIG. 1, a flange-shaped stopper 2 is fixed to the piston shaft 17a so that when the piston 17 descends excessively, the stopper collides with the cylinder 11. It has become. By limiting the moving distance of the piston in this way,
It is possible to increase the rigidity of the structure and prevent excessive displacement of the structure. In this case, the cushion material 3 is installed on the collision surface so as to reduce the impact caused by the collision between the stopper 2 and the cylinder 11.

The specific gravity of the viscous substance B is usually smaller than that of the working liquid A. In such a case, there is no possibility that the viscous substance will sink into the working liquid in the cylinder. The rubber septum 12 between them is not necessary. However, when small bubbles are scattered in the viscous substance B in the piston chamber, the high-pressure working liquid A rises along the bubbles and is ejected to the atmosphere. The ejection of viscous material can be prevented.

Next, the assembling of the above-mentioned connection type damper into the structure will be described. FIG. 3 (a) shows a rigid frame with three layers and three spans, which is used as a building structure.
Is a pillar and reference numeral 6 is a beam. On each layer of the center span of the skeleton, a triangular truss 8 extending from the contact to the left and right and facing in the center is installed. FIG. 4 is an enlarged view of the IV part in FIG. 3 (a). As can be seen from this, at the tip of the opposing truss,
A damper mounting bracket 9 is formed, a pair of cylinder units 10 are mounted vertically, and a liquid chamber of each unit is connected by a connecting pipe 15.

When the skeleton receives lateral force F and is displaced to the right as shown in FIG. 3 (b), the triangular truss tip is pulled by the upper piston 17 and the lower piston 17 is forced to be displaced. Relative displacement occurs. When the frame is displaced to the left, the piston is forced to move in the opposite direction.
Therefore, when the skeleton vibrates horizontally due to an earthquake or wind, the upper and lower pistons are repeatedly displaced by pushing and pulling alternately, the liquid vibrates at high speed in the connecting pipe, the resistance force due to the cylinder internal pressure and the shear deformation of the viscous body It is transmitted to the skeleton by viscous resistance, and acts as a damping force for vibration.

In the construction frame, the span length L is higher than the floor height H.
Is usually large. Therefore, if a damper is installed at the tip of the triangular truss taken out from the upper and lower contacts as in this embodiment, the displacement stroke of the damper is increased and the resistance force of the damper is transmitted as a horizontal damping force of the frame. There are advantages.

This will be described with reference to FIG. FIG.
In the case of the L = 2H frame shown in Fig. 6, when the interlayer displacement of δ occurs in the horizontal direction as shown in Fig. 7B, the left and right triangular trusses 8 rotate in opposite directions, and the tips of -δ and δ respectively. Since the vertical displacement is generated and the total relative displacement is 2δ, the damper has a stroke twice as large as the interlayer displacement.

Assuming that the resistance force of the damper is P, the resistance force P is transmitted as the shearing force Q = P of the left and right columns from the balance condition, as shown in FIG. The resistance becomes 2Q = 2P, and the resistance of the damper is doubled to become the vibration damping force of the frame.

On the other hand, as shown in (d) and (e) of the figure, when the damper is installed on the triangular truss which is taken out from the left and right contacts in the vertical direction, the interlayer displacement δ itself becomes the stroke of the damper. Compared with this case, in the configuration of the present embodiment, when L = 2H, if the resistance of the damper is proportional to the speed, the vibration can be damped with four times the efficiency.

The following is an example of a stand-alone damper. The single type damper shown in FIG. 6 has only one cylinder unit 30 having the same structure as the connection type damper of FIG. 1, and a liquid storage tank 38 is provided side by side with the cylinder unit 30. The liquid chamber 34 of the cylinder 31 and the liquid storage tank 38 communicate with each other through a discharge pipe 35 having a small diameter (a pipe having an orifice in the middle may be used). In parallel with this, a thick suction pipe 36 that connects the two is provided, and a check valve 36a is attached to the cylinder side outlet thereof.

The damper attaches the cylinder unit 30 to the structure so that the damper 37 pushes the piston 37 and alternately pulls the same as the structure vibrates. When the piston 37 moves in the pushing direction, the check valve 36a of the suction pipe 36 closes, so that the liquid is pushed out by the thin discharge pipe 35 to generate the internal pressure due to the liquid flow resistance, and at the same time, the shear resistance of the viscous body B is increased. Occurs. On the other hand, when the piston 37 moves in the pulling direction, the pressure inside the cylinder becomes negative and the check valve 36a opens, so that the working liquid is supplied from the liquid storage tank 38 into the cylinder through the suction pipe 36 having a large diameter. To be done.
In this case, the resistance of the damper is such that the liquid flow resistance is small, and is almost only the shear resistance of the viscous body.

As described above, since the single-type damper has a large resistance in the pushing stroke and a small resistance in the pulling stroke, it is dispersed in the entire structure so that the pushing and pulling strokes appear in the same number of dampers in use. There is a need to. Further, when used for a flexible structure, the damper can be provided with a stopper function, as in the case of the connection type.

FIG. 7 shows another embodiment of the stand-alone damper. This one is also a cylinder unit 50
However, since the piston 57 uses the inside as the liquid storage tank 58, the upper portion is open to the atmosphere. Between the piston bottom plate and the bottom of the cylinder 51, an expansion / contraction container 52 that is expandable / contractible in the axial direction and also deformable in the radial direction is provided, and the inside thereof is used as a liquid chamber 54. The liquid storage tank 58 in the piston and the liquid chamber 54 in the expandable container 52 are respectively filled with the working liquid A, and a thin discharge pipe 55 (or an orifice hole) is provided between them.
And a suction port 5 with a check valve 56a provided on the piston bottom plate
Double communication is made by 6. The viscous substance B is filled in the gap between the piston 57 and the expansion / contraction container 52 and the inner surface of the cylinder 51, and is used as a seal against internal pressure.

This damper is also installed so as to be alternately pushed and pulled with the vibration of the structure. When the piston 57 moves in the pushing direction, a positive pressure is generated in the expandable container 52 and the check valve 56a is closed, so that the liquid A is pushed out to the liquid storage tank 58 inside the piston through the thin discharge pipe 55, and Similarly to the generation of internal pressure due to flow resistance, viscous resistance occurs due to shear deformation of the viscous body.

On the other hand, when the piston moves in the pulling direction, the pressure inside the expansion container becomes negative and the check valve opens, so that the liquid flows from the liquid storage tank in the piston through the suction port 56 of the bottom plate to the expansion container. 52. In this case, the resistance of the damper is such that the liquid flow resistance is small, and is almost only the viscous resistance of the viscous substance. As described above, the resistance force of the damper, which is a combination of the internal pressure of the liquid and the shear resistance of the viscous substance, generated as the piston reciprocates, is transmitted to the structure and acts as a vibration damping force. This stand-alone damper has the advantage that it can be made compact because the liquid storage tank is not outside the cylinder unit.

FIG. 8 also shows a stand-alone damper composed of one cylinder unit 70. Piston 7
7 is provided with a skirt 77b, and the liquid chamber 74 is placed inside the skirt.
To use as. A rubber diaphragm 72 is provided at the lower end of the skirt,
This separates the working fluid A and the viscous substance B. Piston 77
The piston shaft 77a extending upward from is formed hollow, and the inside thereof is used as a liquid storage tank 78. The liquid chamber 74 and the liquid storage tank 78 are doubly connected to each other by a thin discharge pipe 75 (or an orifice hole may be used) and a suction port 76 with a check valve 76a. The viscous substance B is filled in the gap between the piston 77 and the inner surface of the cylinder 71.

This damper is also installed so as to be alternately pushed and pulled with the vibration of the structure. When the piston 77 moves in the pushing direction, a positive pressure is generated in the liquid chamber 74 in the piston and the check valve 76a is closed, so that the working liquid A passes through the thin discharge pipe 75 and is stored in the liquid storage tank 78 on the piston. At the same time as being extruded and generating internal pressure due to liquid flow resistance, viscous resistance due to shear deformation of the viscous body occurs.

On the other hand, when the piston moves in the pulling direction, the inside of the liquid chamber 74 in the piston becomes a negative pressure and the check valve opens, so that the liquid passes from the liquid storage tank 78 on the piston through the suction port 76. It is supplied to the liquid chamber 74 in the piston. In this case, the resistance of the damper is such that the liquid flow resistance is small, and is almost only the viscous resistance of the viscous substance. This stand-alone damper can be made compact because the liquid storage tank is not outside the cylinder unit, and moreover, it is a cylindrical expansion container (reference numeral 5 in FIG. 7).
It does not require complicated things like 2) and has a simple structure.

Next, these stand-alone dampers are combined with the damping frame structure (beam damping frame, Japanese Patent Laid-Open No. 7-301) that I have already proposed.
No. 023 Publication) will be described.
FIG. 9 (a) shows a three-layer, three-span steel-framed beam damping frame used in a building structure. In this frame, the beams 6L and 6R of the left and right spans, excluding the central span, among the beams 6 of three spans, have upper and lower flanges 6 at the center.
The web 6b is cut away leaving a, and an opening 7 is provided.

As shown in FIG. 9B, when the beam damping frame is displaced to the right by the lateral force F, the central opening 7 of the beam 6L of the left span and the beam 6R of the right span is attached to the flange 6a. Remarkable bending deformation occurs, and as shown in FIG. 9C, relative displacement in the vertical direction occurs at the left and right ends of the opening 7.

In the openings 7 of the beams 6L and 6R,
As shown in FIG. 9D, a stand-alone damper is incorporated. The stand-alone damper may be of any type, but Fig. 9
In (d), the damper of FIG. 7 is incorporated. When the skeleton is displaced to the right, the piston is pulled in the beam 6L and is pushed in the beam 6R due to the relative displacement of both ends of the opening 7. When the skeleton is displaced to the left, each piston is displaced in the opposite direction.

Therefore, when the skeleton vibrates in the horizontal direction, the piston of the damper undergoes a reciprocating motion of pushing and pulling, and the cylinder internal pressure due to the liquid flow resistance of the discharge pipe,
The viscous resistance due to the shear deformation of the viscous substance around the piston cylinder acts on the frame as a vibration damping force.

In the stand-alone damper, there is an asymmetry that the resistance is large in the stroke of the push displacement of the piston, and the resistance is small in the stroke of the pull stroke. By arranging the dampers so that the same number of dampers and the dampers in the pulling phase are arranged, the damping force with respect to the entire structure can be made independent of the vibration direction.

FIG. 10 shows an oscillating test body of a connection type damper manufactured to one third of the actual size. A piston 17 is inserted in the upper part of a cylinder 11 having an inner diameter of 6 cm, and a viscous substance B (butane-based polymer compound, 20 ° C., separated by a rubber septum 12).
Of which the viscosity is 140,000 poise) is filled with water as the working liquid A in the lower liquid chamber 14, and the upper and lower cylinder liquid chambers 14 are connected by a copper tube 15 having an inner diameter of 2 mm and a length of 48 cm. The clearance between the piston 17 and the inner surface of the cylinder 11 is 0.5 mm at the narrowest point and 2 mm near the top and bottom.

The upper and lower ends of a pair of upper and lower cylinder units 90 are fixed to a jig 91, both the cylinder units are connected to a force frame 92 penetrating between the upper and lower cylinder units 90, and the force frames are hydraulically operated by a hydraulic actuator. Shake,
Pushing and pulling forced displacements of both units in opposite sine waveforms.

FIG. 11A shows a hysteresis loop of the resistance force of the damper when the damper is vibrated with a sine wave of 0.5 Hz. The solid line in the figure shows the history of the total resistance of the damper. FIG. 11B is a hysteresis loop of the internal pressure difference between the upper and lower cylinders at this time, which corresponds to the liquid flow resistance in the connecting pipe. The shear resistance of the viscous substance can be obtained by subtracting the hydraulic resistance obtained by multiplying the internal pressure difference by the cylinder cross-sectional area from the total resistance of the damper. The dotted line in FIG. 11A is a hysteresis loop of the shear resistance force of the viscous substance thus obtained.

FIG. 12 shows the vibration amplitude of the piston and the maximum value of the damper resistance separately for each component of the hydraulic resistance and the resistance of the viscous substance. When the vibration is applied at 0.5 Hz in FIG. 12 (a). Then, FIG. 12B shows a case of 2 Hz excitation. As shown in the figure, the resistance of the viscous substance shows an almost constant value regardless of the vibration frequency, and when the displacement amplitude increases, the rising tendency of the resistance reaches a peak, whereas the hydraulic resistance increases the displacement amplitude. And increases non-linearly. From this, it can be seen that the resistance of the viscous substance compensates for the lack of liquid resistance in the small displacement region. Further, it can be seen that the hydraulic resistance increases steeply as the frequency increases, so that a strong damping force is generated even with high-frequency vibration.

The maximum internal pressure of the cylinder measured in the vibration test is 18.1 kg when the vibration is 2 Hz and the piston displacement amplitude is 2.9 mm.
/ cm ² was reached, and the total resistance of the damper at this time was 600 kg. It can be seen that the viscous seal system of the present invention can withstand a high internal pressure and generate a sufficient vibration damping force.

[0051]

As described above, the liquid damper of the present invention is one in which the gap between the piston and the cylinder is filled with a viscous substance, and when the piston dynamically reciprocates, the viscous liquid has a high viscous resistance. The substance hardly moves, and the pressure inside the cylinder can be sealed by the viscous substance. Since the viscous substance can be filled in and sealed in this way, the piston and the cylinder do not need to be finished with high precision as in a conventional damper, and they are easy to manufacture and can be provided at a low cost.

Further, when the piston moves, the viscous substance filled in the gap between the piston and the cylinder undergoes shear deformation, so that shear resistance is generated and viscous resistance force due to shear acts on the piston. Therefore, when the structure vibrates, not only the liquid flow resistance generated when the working liquid reciprocates in the narrow passage but also the viscous resistance generated when the viscous substance undergoes shear deformation is generated in each cylinder unit. The liquid flow resistance has a large value for high-frequency, large-amplitude vibrations, but it has the property of being small for low-frequency, small-amplitude vibrations.On the other hand, the resistance due to shear deformation of filled viscous bodies is It has a property that it is large for vibrations of high frequency and small amplitude and low for high frequency vibration. Therefore, by using a viscous substance as the sealing material, the flow resistance of the working liquid and the shearing resistance of the viscous substance complement each other, and a strong damping force can be exerted in a wide frequency range from a small amplitude to a large amplitude. .

In a single type damper composed of one cylinder unit, the piston is provided with a skirt and the skirt is used as a working liquid storage tank, and the piston shaft extending from the piston is also formed in a hollow shape. If used as a storage tank, the entire device can be made very compact.

When the object of vibration control is a flexible structure having a small spring constant, a flange-shaped stopper is provided on the piston, and when the piston is excessively displaced, the collar collides with the cylinder to prevent further piston displacement. By suppressing, the rigidity of the structure can be increased and excessive displacement of the structure can be prevented. In this case, if a cushion material is installed on the collision surface, the impact due to the collision between the stopper and the cylinder can be mitigated.

[Brief description of drawings]

FIG. 1 is a cross-sectional structural view of a connection type damper.

FIG. 2 is an explanatory view of the operation of the connection type damper.

FIG. 3 is an elevational view of a building frame incorporating an articulated damper.

FIG. 4 is an enlarged view of an IV portion of FIG.

FIG. 5 is a diagram for explaining the effect of a triangular truss.

FIG. 6 is a cross-sectional view of a stand-alone damper.

FIG. 7 is a sectional view of another stand-alone damper.

FIG. 8 is a cross-sectional view of yet another stand-alone damper.

FIG. 9 is an explanatory diagram of a building frame incorporating a stand-alone damper.

FIG. 10 is an explanatory view showing a cross section of the vibration test body.

FIG. 11 is a diagram showing a relationship between piston displacement and damper resistance.

FIG. 12 is a diagram showing a relationship between displacement amplitude and damper resistance.

[Explanation of symbols]

 A Working fluid B Viscous substance 2 Stopper 3 Cushion material 10, 30, 50, 70 Cylinder unit 11, 31, 51, 71 Cylinder 14, 34, 54, 74 Liquid chamber 15 Connection pipe 35, 55, 75 Discharge pipe 36, 56 , 76 Suction pipe 17, 37, 57, 77 Piston 48, 58, 78 Liquid storage tank

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[Procedure amendment]

[Submission date] May 2, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction contents]

The specific gravity of the viscous substance B is usually smaller than the specific gravity of the working liquid A. In such a case, there is no possibility that the viscous substance will sink into the working liquid in the cylinder. The rubber septum 12 between them is not necessary. However, when small bubbles are scattered in the viscous substance B in the piston chamber, the high-pressure working liquid A rises along the bubbles and is ejected to the atmosphere. It is possible to prevent ejection of the working liquid .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

When the frame receives lateral force F and is displaced to the right as shown in FIG. 3 (b), the tip of the triangular truss is pulled by the upper piston 17, and the lower piston 17 is forced to be displaced. Relative displacement occurs. When the frame is displaced to the left, the piston is forced to move in the opposite direction. Therefore, when the skeleton vibrates horizontally due to an earthquake or wind, the upper and lower pistons are repeatedly displaced by pushing and pulling alternately. the viscous resistance due to occur transmitted to the framework, which acts as a damping force against the vibration.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

This damper attaches the cylinder unit 30 to the structure so that the damper 37 is pushed and pushed by the vibration of the structure so as to be alternately moved. When the piston 37 moves in the pushing direction, the check valve 36a of the suction pipe 36 closes, so that the liquid is pushed out by the thin discharge pipe 35 to generate the internal pressure due to the liquid flow resistance, and at the same time, the shear resistance of the viscous body B is increased. Occurs. Meanwhile, when the piston 37 moves in the direction of pull, since the cylinder check valve 36a and a negative pressure is opened, the working liquid is fed through the inlet pipe 36 of large diameter from the liquid reservoir 38 into the cylinder To be done. The resistance of the damper in this case has a small liquid flow resistance,
Almost only the shear resistance of a viscous body.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

Claims (4)

[Claims] 1. A pair of two cylinder units (10) incorporated in a structure such that the piston reciprocates in the cylinder due to the vibration of the structure, and when one is pushed, the other is pulled. In the liquid damper configured such that the insides of the two cylinders are communicated with each other through the flow path (15) having a restricted cross-sectional area, and the working fluid (A) reciprocates therein, And a liquid damper characterized in that a viscous substance (B) is filled in a gap between the piston and the piston and sealed. 2. The cylinder (3
Pistons (37, 57, 77) in 1, 51, 71)
And a working fluid storage tank (38,
58, 78), and when the piston is pushed into the cylinder, the working liquid (A) in the cylinder passes through the flow passages (35, 55, 75) having a limited cross-sectional area to the working liquid reservoir. A liquid configured to be pushed out and when the piston retracts from the cylinder, the working liquid in the working liquid reservoir is sucked into the cylinder through the flow passages (36, 56, 76) having a large cross-sectional area. In the damper, a viscous substance (B) is filled in a gap between the inner surface of the cylinder and the piston to seal the liquid damper. 3. A skirt (77b) is provided in the piston, the skirt is used as a working liquid storage tank (74), and a piston shaft extending from the piston is formed hollow.
The liquid damper according to claim 2, wherein the liquid damper is used as a working liquid storage tank (58). 4. A stopper 2 having a brim shape is provided on the piston so that when the piston is excessively displaced, the brim collides with the cylinder.
The liquid damper according to claim 1, 2 or 3, wherein the liquid damper is attached.