JP2003269533A - Damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping device for realizing miniaturization and small diameter of an attenuator. <P>SOLUTION: In this damping device, both ends of an attenuator connected in series with a brace 9 and an attenuator 8 are linked to a column, a beam, and the like of a structure. An accumulator 2 is installed in a space in a brace pipe 30 constituting the brace 9. <P>COPYRIGHT: (C)2003,JPO

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 for damping and converging the sway in a short time when a high-rise building or the like sways due to an earthquake or wind.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a damping device of this type has a damping device in which a damping device 8 and a brace 9 are connected in series, and both ends of the damping device are connected to columns or beams of a structure. It will be.

An accumulator 2 including a free piston 3 and a spring 18 for urging the free piston 3 is installed inside the piston rod 1 installed inside the attenuator 8. Further, one end of the gauge rod 4 is attached to the free piston 3, and the other end is projected from the bottom wall 5 of the accumulator 2.

The accumulator 2 expands when the temperature of the hydraulic oil inside the attenuator 8 rises and increases.
It is provided to absorb this.

Then, it is confirmed by checking whether the scale of the gauge rod 4 is at a predetermined position through the sight window 7 provided in the cylinder tube 6 (that is, whether the oil amount is proper or not). The container 8 was inspected for oil leakage before shipping.

[0006]

Therefore, in the above configuration, the maximum length of the gauge rod 4 protruding from the accumulator 2 is determined in the accumulator 2 in consideration of the expansion of the hydraulic oil due to the increase in the oil temperature. . As a result, the protruding portion of the gauge rod 4 is inevitably long, and the attenuator 8 including this is also a long member.

However, in recent years, the size of vibration damping devices has been reduced, and when the length of the attenuator is shortened in order to meet the specifications required by the user, the piston rod diameter and the cylinder diameter must be increased. However, there was a limit to making the attenuator shorter and smaller at the same time.

In view of the above points, an object of the present invention is to provide a vibration damping device that realizes downsizing and diameter reduction of an attenuator.

[0009]

According to a first aspect of the present invention, there is provided a vibration damping device in which both ends of a damping device in which a brace and an attenuator are connected in series are connected to columns or beams of a structure. The feature is that the accumulator is installed in the space inside the brace pipe that constitutes the brace.

The invention of claim 2 is characterized in that a gauge rod insertion hole through which a gauge rod for checking the oil amount is inserted is formed in the spring seat of the accumulator.

The invention of claim 3 is characterized in that the accumulator is installed at the end of the piston rod extending to the brace side.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing the entire vibration damping device according to the present invention. The left and right brackets 11a and 11b of the damping device are attached to, for example, a mounting plate or the like fixed to the intersection of the pillar and the beam of the high-rise building.

The piston rod 1 of the damper 8 is connected to the bracket 11a via the brace 9, and the cylinder tube 6 is connected to the bracket 11b.

Next, the internal structure of the attenuator 8 will be described. In the attenuator 8, the left and right sides of the cylinder tube 6 are closed by the cylinder heads 12a and 12b, and the piston 13 coupled to the piston rod 1 is inserted thereinto to divide the oil chambers R1 and R2. Then, a predetermined portion of the piston rod 1 is slidably held by the cylinder heads 12a and 12b.

An accumulator 2 is installed at the end of the piston rod 1 on the brace side. The accumulator 2 has a free piston 3 that is slidably inserted into the inner wall of the accumulator cylinder 23 and defines an oil chamber R3, and a spring 18 that constantly presses the free piston 3 toward the oil chamber R3. is doing. The oil chambers R1 and R2 in the cylinder tube 6 and the oil chamber R3 in the accumulator 2 are filled with the hydraulic oil injected at a predetermined pressure.

The piston 13 is the piston rod 1
An oil passage L1 communicating with the accumulator 2 via an oil passage L2 formed in a, and check valves 14a, 14b which are opened when the piston 13 moves and the oil chamber R1 or R2 expands.
And throttles 15a and 15b that constantly connect the oil chambers R1 and R2 to the accumulator 2, and a damping valve 16 that operates only when the piston 13 moves to reduce the oil chamber R1 or R2.
a and 16b.

Next, the operating state of the attenuator 8 will be described. In the extension operation in which the piston rod 1 is pulled out from the cylinder tube 6 due to swaying or the like in the structure, the piston 13 moves to the right in the drawing. Along with this movement, the working oil in the oil chamber R1 is restricted by the throttle 15a and the damping valve 16
The vibration of the building is suppressed by flowing into the accumulator 2 while generating a damping force with a. Further, at this time, the working oil flows from the accumulator 2 into the expanding oil chamber R2 through the check valve 14b.

On the contrary, in the contraction operation in which the piston 13 moves leftward in the drawing, the throttle 15b, the damping valve 16b and the check valve 14a function in the same manner as described above.

Here, the throttles 15a and 15b are always in the oil chamber R.
1, R2 and the accumulator 2 are communicated with each other, the oil temperature rises when the attenuator 8 is stationary and the oil chambers R1, R2
When the volume of hydraulic oil therein expands, excess hydraulic oil can be discharged from the oil chambers R1 and R2 to the accumulator 2. Further, when the hydraulic oil volume in the oil chambers R1, R2 contracts due to the decrease in the oil temperature, the insufficient hydraulic oil can be replenished from the accumulator 2.

FIG. 2 is a sectional view showing a brace 9 including the accumulator 2. The accumulator 2 has one end coupled to the outer periphery of the tip of the piston rod 1 extending toward the brace.

Specifically, the first flange 26 and the nut 2
4 is joined to the piston rod 1 by screwing a stop ring 25 fitted in an annular groove 1c on the outer circumference of the piston rod 1 with the stop ring 25 sandwiched therebetween. Then, by engaging one end of the accumulator cylinder 23 with the nut 24,
The accumulator 2 is connected to the piston rod 1.

The accumulator 2 has a free piston 3 slidably inserted into the inner wall of the accumulator cylinder 23, a spring 18 for biasing the back surface of the free piston 3, and an accumulator cylinder 23. And a spring seat 19 which holds the spring 18 by being coupled to each other. Further, the spring seat 19 has a gauge rod A for detecting the oil amount.
A gauge rod insertion hole 19c through which the is inserted.

The first flange 26 and the second flange 28
Are coupled by tightening with a bolt 27 while sandwiching a stopper 29 fitted in an annular groove 30a formed on the inner circumference of the end of the brace pipe 30, thereby connecting the piston rod 1 and the brace 9. It

Next, the inspection of the amount of oil at the time of manufacturing and shipping the vibration damping device according to the present invention will be described with reference to FIGS. 1 and 2. The cylinder tube 6 of the attenuator 8 is provided with hydraulic oil supply ports 21 and 22 at two locations, and the hydraulic oil set to a predetermined pressure is supplied from the hydraulic oil supply ports 21 and 22 to the oil chamber R.
1 and the oil chamber R2. Then, the oil chambers R1 and R2 are filled with hydraulic oil, and the hydraulic oil is supplied to the accumulator 2 by forcibly opening the throttles 15a, 15b and the damping valves 16a, 16b at the supply pressure. .

The working oil presses the free piston 3 against the bias of the spring 18 to expand the oil chamber R3, and the free piston 3 stops at a position where it balances with the set pressure.

Here, the hydraulic oil supply ports 21 and 22 are closed, the gauge rod A is inserted into the gauge rod insertion hole 19c formed in the spring seat 19 of the accumulator 2, and the tip of the gauge rod A is freed. The scale of the gauge rod A is read at the position where it abuts the piston 3.

Next, after the vibration damping device is operated and the piston is moved at a predetermined speed to check whether the damping valves 16a and 16b and the check valves 14a and 14b are operating correctly, The gauge rod A is again inserted through the gauge rod insertion hole 19c, and the scale of the gauge rod A is read at the position where the tip of the gauge rod A abuts the free piston 3.
If this value is larger than the initial value (if the length into which the gauge bar is inserted is increased), the amount of hydraulic oil has decreased, so the vibration damping device You can determine that an oil leak has occurred somewhere.

Needless to say, various embodiments can be adopted without departing from the spirit of the present invention.

For example, in the drawings of the above embodiments, the inner diameter of the accumulator cylinder 23 is drawn so as to be substantially equal to the outer diameter of the piston rod 1, but the present invention is not limited to this, and the inner diameter of the brace pipe 30 is The length of the attenuator as a whole can be shortened by expanding the oil chamber R3 until the oil chamber R3 has a substantially equal volume.

[0030]

According to the first aspect of the invention, the brace is configured in a vibration damping device in which both ends of a damping device in which a brace and a damper are connected in series are connected to a pillar or a beam of a structure. Since the accumulator is installed in the space inside the brace pipe, the diameter and the length can be made smaller than those of the conventional attenuator.

Further, since the diameter of the accumulator cylinder can be increased, the entire damping device can be shortened.

The invention of claim 2 is characterized in that the accumulator spring seat is provided with a gauge rod insertion hole through which a gauge rod for checking the amount of oil is inserted. The gauge rod attached to the free piston of the accumulator can be eliminated, and the attenuator can be further shortened.

The invention according to claim 3 is characterized in that the accumulator is installed at the end portion of the piston rod extending to the brace side. Therefore, an oil passage communicating with the accumulator can be provided inside the piston rod, and the device can be provided. It does not have to be complicated.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a vibration damping device according to the present invention.

FIG. 2 is a sectional view showing a brace including an accumulator.

FIG. 3 is an explanatory diagram showing a conventional vibration damping device.

[Explanation of symbols]

1 piston rod 2 accumulator 3 free piston 6 cylinders 8 attenuator 9 braces 11a, 11b bracket 30 brace pipe

Claims (3)

[Claims] 1. A vibration damping device in which both ends of a damping device in which a brace and an attenuator are connected in series are connected to a pillar or a beam of a structure, and an accumulator is provided in a space inside a brace pipe forming the brace. A vibration damping device characterized by having installed. 2. The vibration damping device according to claim 1, wherein the spring seat of the accumulator is provided with a gauge rod insertion hole through which a gauge rod for checking the amount of oil is inserted. 3. The vibration damping device according to claim 1, wherein the accumulator is installed at the end of the piston rod extending to the brace side.