JP3418691B2 - Damping device - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vibration damping device used for damping buildings or the like.

[0001]

2. Description of the Related Art In recent years, many so-called long and slender buildings, that is, high-rise or middle-rise buildings called card-type buildings or pencil-type buildings have been built in urban areas due to the small site area. Has the inconvenience of being easily shaken by an earthquake or wind pressure.

Therefore, in such an elongated building, it has been proposed to provide a vibration damping device S on the roof of the building B, as shown in FIG. A heavy object movably provided in the horizontal direction, for example, a hydraulic cylinder 1 for controlling the horizontal movement of the water tank W.
To have.

The hydraulic cylinder 1 constituting the vibration damping device S is
The cylinder body 11 has one end side member and the rod body 12 has the other end side member that is inserted into and retractable from the cylinder body 11.
By supplying and discharging the hydraulic pressure from an external hydraulic source to the expansion side chamber and the compression side chamber, which are partitioned and formed inside, via an appropriate control valve, for example, an electromagnetic proportional directional flow control valve, this is expanded and contracted. Has been formed.

In the hydraulic cylinder 1, for example, the cylinder body 11 is a fixed side member and is connected to a bracket b fixed on the roof of the building B, while the rod body 12 is a movable side member. It will be connected to the water tank W.

Incidentally, the water tank W is installed so as to be movable in the horizontal direction with respect to the building B, that is, in the expansion / contraction direction of the hydraulic cylinder 1.

Therefore, when the hydraulic cylinder 1 is expanded and contracted, the water tank W moves horizontally following the expansion and contraction of the hydraulic cylinder 1, and the inertial force due to the movement of the water tank W at that time causes the building B to move. It will act on the rooftop, that is, on the roof.

Therefore, for example, when the top end of the building B swings horizontally due to wind pressure or the like, the hydraulic cylinder 1 is expanded and contracted to move the water tank W in the direction opposite to the moving direction of the top end of the building B. By moving it, the inertial force at that time can be applied to the top end of the building B, and the top end of the building B, that is, the swing of the building B due to the wind pressure action can be suppressed to be small. It will be possible.

[0008]

However, in the above-described proposal of the conventional vibration damping device S, for example, the control valve does not operate due to a failure of the electric system or the like, and the hydraulic cylinder 1 is expected to expand and contract to a predetermined extent. When it becomes impossible, the following inconveniences have been pointed out.

That is, in general, the control valve is set so as to be automatically maintained in a so-called neutral state when it becomes inoperative due to a failure of the electric system. , Is set so as to prevent expansion and contraction of the hydraulic cylinder 1.

This is a water tank W provided on the roof of the building B.
This is because such heavy objects are originally arranged in a fixed state for safety reasons.

Therefore, when the hydraulic cylinder 1 is prevented from expanding and contracting due to the so-called inoperative state of the control valve, if the wind pressure acts on the water tank W, the wind pressure acting on the water tank W is reduced. Will act on Building B,
Since the wind pressure is also acting on the building B, there is a problem that the shaking of the building B is further increased by the wind pressure acting on the water tank W.

From the above, it is proposed to set the hydraulic cylinder 1 so that it can be expanded and contracted when the control valve is in a so-called inoperative state. However, if the wind pressure acts, the water tank W will sway, which is of course not preferable, and in extreme cases, it is dangerous and the inertia force when the water tank W is moved is positively applied to the building B. However, there is a problem that it causes the building B to shake on the contrary.

[0013] Therefore, from the above, in the normal state, the vibration is actively suppressed, but in the case of the abnormality, the active vibration is basically rejected. It is optimal to do such vibration control.

This is a measure for solving common problems not only in buildings such as buildings but also in vehicles as long as the purpose is damping.

The present invention was devised in view of the present situation as described above, and its purpose is not only for damping a building such as a long and narrow building but also for the purpose of damping the vibration. In order to provide a vibration damping device, the vibration damping device is optimized for its use.

[0016]

In order to achieve the above object, one of the means of the present invention is to provide a first expansion chamber and a second compression chamber in a hydraulic cylinder divided into a cylinder body.
Of the main circuit and the second main circuit are connected, each main circuit is selectively connected to a hydraulic pressure source or a tank via a control valve, and a bypass circuit is connected between the main circuits. A switching valve and a damping mechanism are provided,
In the vibration damping device in which the switching valve is in the cut-off position when the control valve is in the communication position, and conversely when the control valve is in the cut-off position, the switching valve is in the communication position,
The damping mechanism includes an expansion-side damping valve and a compression-side damping valve that are provided in series in the middle of a bypass circuit, and the expansion-side damping valve and the compression-side damping valve are a throttle, a check valve, and a relief valve, respectively.
Are provided in parallel, and further, the expansion side damping valve and the pressure side are arranged.
A communication passage is connected between the bypass circuit between the damping valve and the pressure side chamber of the hydraulic cylinder, and a check valve that allows the flow of oil only from the bypass circuit to the pressure side chamber is connected in the middle of this communication passage. Further, an oil passage is connected between the tank and the communication passage between the throttle and the check valve.

Similarly, the other means connects the first main circuit and the second main circuit to the expansion side chamber and the compression side chamber of the hydraulic cylinder divided into the cylinder body, and each main circuit is connected via the control valve. Is selectively connected to a hydraulic pressure source or a tank, a bypass circuit is connected between the main circuits, a switching valve and a damping mechanism are provided in the middle of the bypass circuit, and the switching valve operates when the control valve is in the communication position. In a damping device in which the switching valve is in the communication position when the control valve is in the shut-off position and the control valve is in the shut-off position, the tank is set as a pressurized tank and the damping mechanism is connected in series in the middle of the bypass circuit. It consists of a extension side damping valve and the compression side damping valve provided in, and the expansion side damping valve and the compression side damping valve
Each has a throttle, a check valve, and a relief valve in parallel
It is characterized in that an oil passage is connected between the bypass circuit between the expansion side damping valve and the compression side damping valve and the pressurized tank.

[0018]

Further, in each of the above means, the control valve is an electromagnetic directional flow control valve, and the switching valve is an electromagnetic directional control valve. When an abnormality occurs, the electromagnetic directional flow control valve is switched to the shut-off position while the electromagnetic switching is performed. The valve is set to switch to the open position.

Further, detection means for detecting the expansion / contraction state of the hydraulic cylinder and detection means for detecting the state of the external force acting on the object such as wind pressure are provided, and various signals such as signals from the respective detecting means are provided. Based on this, a controller for outputting a predetermined command signal to the electromagnetic directional flow control valve, the electromagnetic switching valve, the hydraulic pressure source, etc. is provided.

[0021]

Therefore, by supplying / discharging the hydraulic pressure from the hydraulic source to / from the expansion side chamber and the compression side chamber in the hydraulic cylinder via the electromagnetic proportional directional flow control valve as a control valve, the hydraulic cylinder is positively operated. It becomes possible to expand and contract, and it becomes possible to positively suppress the object based on the situation in which the hydraulic cylinder is expanded and contracted.

When an abnormality occurs due to a failure of the electric system or the like, the electromagnetic proportional directional flow control valve is switched to the shut-off position to prevent expansion and contraction of the hydraulic cylinder in principle, while the electromagnetic switching valve is placed. Is switched to the communication position, and the expansion side chamber and the compression side chamber in the hydraulic cylinder are in communication with each other via the electromagnetic switching valve and the damping mechanism.

At this time, when an external force acts on the hydraulic cylinder via the object, the hydraulic cylinder expands and contracts under the generation of the damping force of the damping mechanism and acts on the object moving by the external force. Minimal damping is possible.

Then, based on various signals from the detection means for detecting the expansion / contraction state of the hydraulic cylinder and the detection means for detecting the action state of the external force on the object, the controller causes the electromagnetic directional flow control valve, the electromagnetic switching valve and the hydraulic pressure. When outputting a predetermined command signal to the source, so-called automatic control is possible and the damping function is improved.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit of a vibration damping device according to an embodiment of the present invention. As shown in FIG. 2, this vibration damping device connects a first main circuit M1 and a second main circuit M2 to the expansion side chamber R1 and the compression side chamber R2 in a hydraulic cylinder 1 partitioned in a cylinder body 11, respectively. , Each main circuit M1, M
2 is selectively connected to a hydraulic power source P or a tank T via an electromagnetic proportional directional flow control valve 2 which is a control valve, a bypass circuit BP is connected between the main circuits M1 and M2, and a bypass circuit BP is provided in the middle of the bypass circuit BP. An electromagnetic switching valve 3 serving as a switching valve and a damping mechanism 4 are provided. When the control valve is in the communication position, the switching valve is in the shutoff position, and conversely, when the control valve is in the shutoff position, the switching valve is in the communication position. It is what

Then, the attenuating mechanism 4 includes the bypass circuit B.
An expansion side damping valve V1 and a compression side damping valve V, which are provided in series in the middle of P
2, and a communication passage L1 is connected between the bypass circuit BP between the expansion side damping valve V1 and the compression side damping valve V2 and the pressure side chamber R2 of the hydraulic cylinder 1, and in the middle of this communication passage L1. A check valve 6 which allows the flow of oil only from the throttle 5 and the bypass circuit BP to the pressure side chamber R2 is provided, and an oil passage L is provided between the tank L and the communication passage L1 between the throttle 5 and the check valve 6. Are connected. This will be described in more detail below.

As shown in FIG. 1, a vibration damping device according to an embodiment of the present invention includes a hydraulic cylinder 1, an electromagnetic proportional directional flow control valve 2 as a control valve, and an electromagnetic switching valve 3 as a switching valve. , A damping mechanism 4, and is configured to control the operation of each of the valves 2 and 3 and further the operation of the hydraulic power source P (see FIG. 2) by a command signal from the controller C. There is.

As shown in FIG. 1, a damping mechanism 4 is integrally connected to the outer periphery of the hydraulic cylinder 1, and an electromagnetic switching valve 3 and an electromagnetic proportional directional flow control valve 2 are integrally connected to the damping mechanism 4. Is formed.

In the hydraulic cylinder 1, a rod body 12 which is the other end side member is inserted into a cylinder body 11 which is the one end side member so as to be retractable, and a cylinder body which is continuously provided at the tip of the rod body 12 is provided. It has an expansion side chamber R1 and a compression side chamber R2 which are partitioned and formed in the cylinder body 11 by a piston body 13 which slides in 11.

In the illustrated example, the hydraulic cylinder 1 is the amount by which the rod body 12 appears and disappears with respect to the cylinder body 11.
That is, the detection means 14 for detecting the expansion / contraction state of the hydraulic cylinder 1 is provided, and the signal from the detection means 14 is set to be input to the controller C.

In addition to the signal from the detecting means 14, the controller C includes various sensors from a sensor group such as detecting means for detecting an abnormal state and detecting means for detecting the operating state of the electromagnetic proportional directional flow control valve 2 which will be described later. The signal C1 is input, and based on these signals, the operations of the electromagnetic proportional directional flow control valve 2, the electromagnetic switching valve 3, and the hydraulic power source P are controlled as described above.

In the hydraulic cylinder 1 described above, the expansion side chamber R1 and the compression side chamber R2, which are partitioned and formed in the cylinder body 11, are provided at the communication holes 11a and 11b opened in the cylinder body 11 and the outer periphery of the cylinder body 11. It is communicated with the electromagnetic proportional directional flow control valve 2 side via a pipe 15.

Therefore, according to the hydraulic cylinder 1, for example, the hydraulic cylinder 1 can be compressed by supplying the hydraulic pressure to the expansion side chamber R1, and the hydraulic cylinder can be compressed by supplying the hydraulic pressure to the pressure side chamber R2. A contraction of 1 is possible.

When the hydraulic cylinder 1 is installed on the roof of the building B (see FIG. 4) as in the above-mentioned conventional example, the cylinder body 11 serves as a fixed member and the roof side of the building B is installed. Since the rod body 12 is connected to an object such as the water tank W (see FIG. 4) by being connected to the water tank W, the water tank W can be horizontally moved in the expansion / contraction direction.

The electromagnetic proportional directional flow control valve 2 is switched and operated by a command signal from the controller C to supply the hydraulic pressure from the hydraulic pressure source P to the hydraulic cylinder 1 side or the hydraulic pressure from the hydraulic cylinder 1 side to the reservoir tank T. It is set so that it can be discharged.

The electromagnetic proportional directional flow control valve 2 is
As shown in FIG. 2, the pressure side position 22 that is switched when the solenoid 21 is energized, the extension side position 24 that is switched when the solenoid 23 is energized, and the energizing force of the spring 25 when the solenoids 21 and 23 are de-energized. Cut-off position 2 which is a neutral position maintained by
And 6 are formed.

Therefore, according to the electromagnetic proportional directional flow control valve 2, when it is switched to the pressure side position 22, the hydraulic pressure from the hydraulic pressure source P is supplied to the expansion side chamber R1 in the hydraulic cylinder 1 via the main circuit M1. The hydraulic pressure from the pressure side chamber R2 in the hydraulic cylinder 1 can be supplied and discharged to the reservoir tank T via the main circuit M2, and the hydraulic cylinder 1 can be contracted.

According to the electromagnetic proportional directional flow control valve 2, when it is switched to the extension side position 24, the hydraulic pressure from the hydraulic source P is supplied to the pressure side chamber R2 in the hydraulic cylinder 1, and The hydraulic pressure from the expansion side chamber R2 in the cylinder 1 can be discharged to the reservoir tank T, and the hydraulic cylinder 1 can be extended.

Further, according to the electromagnetic proportional directional flow control valve 2, when it is placed in the shut-off position 26, the hydraulic pressure from the hydraulic source P is supplied to the hydraulic cylinder 1 side and the hydraulic cylinder 1 side is supplied. The hydraulic pressure is prevented from being discharged to the reservoir tank T side, so that the expansion / contraction operation of the hydraulic cylinder 1 can be prevented.

The electromagnetic switching valve 3 is disposed on the so-called downstream side of the electromagnetic proportional directional flow control valve 2, and when the electromagnetic proportional directional flow control valve 2 is in the shutoff position 26, the electromagnetic switching valve 3 is provided. Also, the expansion side chamber R1 and the compression side chamber R2 in the hydraulic cylinder 1 are set to be able to communicate with each other via the damping mechanism 4.

That is, the electromagnetic switching valve 3 includes the solenoid 31.
It is formed so as to have a shut-off position 32 that is switched when the power is supplied to the solenoid 31 and a communication position 34 that is switched by the biasing force of the spring 33 when the power supply to the solenoid 31 is released.

In the normal state, the shut-off position 32 is kept closed by the command signal from the controller C, but in an abnormal state, the communication position 34 is switched and kept in the open state.

Therefore, according to the electromagnetic switching valve 3, when it is in the closed state, the flow of hydraulic oil from the electromagnetic proportional directional flow control valve 2 side to the hydraulic cylinder 1 side and the hydraulic cylinder 1 side. It is possible to prevent the hydraulic fluid from flowing to the electromagnetic proportional direction flow control valve 2 side.
It is possible to not involve the damping mechanism 4 in the vibration damping device.

According to the electromagnetic switching valve 3, when it is opened, as long as the electromagnetic proportional directional flow control valve 2 is maintained in the shut-off position 26, the hydraulic cylinder via the damping mechanism 4 is used. 1, the expansion side chamber R1 and the compression side chamber R2 can communicate with each other, and the hydraulic cylinder 1 can expand and contract with the damping mechanism 4 interposed.

The damping mechanism 4 includes an electromagnetic proportional directional flow control valve 2
Is placed in the shut-off position 26 to prevent the hydraulic cylinder 1 from actively expanding and contracting with the hydraulic power source P.
When the electromagnetic switching valve 3 is placed in the communication position 34 and the expansion side chamber R1 and the compression side chamber R2 in the hydraulic cylinder 1 are communicated with each other via the bypass circuit BP, and the hydraulic cylinder 1 is in a state in which it can freely expand and contract, The hydraulic cylinder 1 functions so as to suppress the expansion and contraction of the hydraulic cylinder 1.

The damping mechanism 4 is composed of an expansion-side damping valve V1 and a compression-side damping valve V2 which are provided in series in the middle of the bypass circuit BP so that the damping mechanism 4 functions in both directions. Is the throttle 41 as a damping valve
a, 41b, check valves 42a, 42b arranged in parallel with the throttles 41a, 41b, and a relief valve 43 arranged in parallel.
a and 43b.

The check valves 42a and 42b function so as to prevent the hydraulic oil from flowing from the electromagnetic switching valve 3 side to the reservoir tank T side, and the relief valves 43a and 43b.
Functions to set the hydraulic pressure on the electromagnetic switching valve 3 side.

Therefore, according to the damping mechanism 4, when the working oil flows from the electromagnetic switching valve 3 side, the working oil passes through the throttle 41a or 41b, and a predetermined damping force is generated. Will be possible.

Further, according to the damping mechanism 4, when the working oil flows from the reservoir tank T side, the working oil passes through the check valves 42a and 42b, and the working oil flows into the damping mechanism. 4 can be distributed without resistance.

A bypass circuit BP between the extension side damping valve V1 and the compression side damping valve V2 is provided with a hydraulic cylinder 1 via a communication passage L1.
Is connected to the pressure side chamber R2, and a throttle valve 5 and a check valve 6 that allows the flow of oil from the bypass circuit BP are provided in the middle of this communication passage. The communication passage L1 between the throttle 5 and the check valve 6 and the tank T are connected via an oil passage L.

Therefore, according to the vibration damping device formed as described above, it is installed on the roof of the building B, for example, when the building B is shaken by wind pressure. By moving the water tank W, which is a heavy object, in a direction opposite to the direction in which the wind pressure acts, it becomes possible to prevent the building B from shaking.

That is, the expansion side chamber R1 in the hydraulic cylinder 1
By supplying / discharging the hydraulic pressure from the hydraulic pressure source P to the pressure side chamber R2 via the electromagnetic proportional directional flow control valve 2 which is operated by a command signal from the controller C, the expansion / contraction operation of the hydraulic cylinder 1 is positively performed. It will be possible.

Therefore, when the expansion / contraction direction of the hydraulic cylinder 1 is controlled so as to be opposite to the movement direction of the water tank W which is going to move by wind pressure action, the inertial force caused by the movement of the water tank W is applied to the building B. As a result, it becomes possible to act, and it becomes possible to suppress vibrations by positively preventing the shaking of the building B due to wind pressure.

On the other hand, when an abnormality occurs due to a so-called electrical system failure or the like, the electromagnetic proportional directional flow control valve 2 is automatically switched to the shut-off position 26 to basically prevent expansion and contraction of the hydraulic cylinder 1. At this time, the electromagnetic switching valve 3 is pushed by the spring 33 and automatically switched to the communication position 34.

As a result, the expansion side chamber R1 and the compression side chamber R2 in the hydraulic cylinder 1 can communicate with each other through the bypass circuit BP, the electromagnetic switching valve 3 and the damping mechanism 4.
At this time, since the damping mechanism 4 is interposed, free expansion and contraction of the hydraulic cylinder 1 is suppressed.

That is, when the water tank W is moved by the action of wind pressure in an abnormal state, the hydraulic cylinder 1 is in a state of being able to expand and contract due to what is called an external force. Therefore, in the expansion side chamber R1 and the compression side chamber R2 of the hydraulic cylinder 1. Supply and discharge of hydraulic oil will be executed.

However, at this time, the expansion side chamber R1 and the compression side chamber R2 of the hydraulic cylinder 1 are separated by the throttle 41 in the damping mechanism 4.
Since the fluid is communicated via either a or 41b, a predetermined flow path resistance at that time, that is, a damping force is generated, so that the hydraulic cylinder 1 freely expands and contracts, that is,
The movement of the water tank W will be suppressed.

For example, when the hydraulic cylinder 1 extends, the oil in the expansion side chamber R1 flows through the main circuit M1-electromagnetic switching valve 3-bypass circuit BP-throttle 41a-check valve 42b-bypass circuit BP -electromagnetic switching valve 3-main circuit M2. To the pressure side chamber R2, and at this time, a damping force is generated in the throttle 41a and a differential pressure is generated in the other throttle 5 to prevent negative pressure in the pressure side chamber R2 and prevent cavitation. . During the above operation, a part of the oil in the bypass circuit BP flows out to the pressure side chamber R2 via the throttle 5, the communication passage L1 and the check valve 6, and the oil corresponding to the volume withdrawn from the rod body 12 flows from the tank T into the oil passage. It is introduced into the pressure side chamber R2 via L and the communication passage L1.

On the other hand, at the time of compression operation, the oil in the pressure side chamber R2 contains the main circuit M2-electromagnetic switching valve 3-bypass circuit BP-throttle 4.
1b-Check valve 42a-Electromagnetic switching valve 3-Main circuit M
1 to the extension side chamber R1, and the amount of oil that has penetrated into the rod body 12 in an amount corresponding to the invasion volume flows out to the tank T via the throttle 5-communication passage L1-oil passage L. At this time, a damping force is generated by the diaphragm 41b,
Another iris 5 prevents cavitation in the extension side chamber R1.

As a result of the above operation, when the water tank W is about to move due to the action of wind pressure, that is, when the building B is about to shake, the movement of the water tank W is blocked so that the inertial force at that time is prevented. It becomes possible to act on the building B, and it becomes possible to suppress swaying due to the wind pressure action that would be caused on the building B.

This state can be regarded as a so-called passive or passive expansion / contraction control, as compared with the above-mentioned active expansion / contraction control by supplying / discharging hydraulic pressure to / from the hydraulic cylinder 1. At least as compared with the case where the hydraulic cylinder 1 freely expands and contracts, it is possible to prevent the horizontal movement of the water tank W and prevent the building B from being adversely affected.

FIG. 3 shows a circuit of a vibration damping device according to another embodiment of the present invention. This vibration damping device is provided with an expansion side chamber R1 and a compression side chamber R2 in a hydraulic cylinder 1 partitioned in a cylinder body 11.
And a first main circuit M1 and a second main circuit M2, respectively, and each of the main circuits M1 and M2 is connected to an oil pressure source P or a tank T via an electromagnetic proportional directional flow control valve 2 which is a control valve.
The bypass circuit BP is connected between the main circuits M1 and M2, the electromagnetic switching valve 3 serving as a switching valve and the damping mechanism 4 are provided in the middle of the bypass circuit BP, and the control valve is in the communicating position. When the control valve is in the shut-off position, the switch valve is in the open position when the control valve is in the shut-off position. Then, the tank T is set to a pressurization type tank, and the damping mechanism 4 is composed of an expansion-side damping valve V1 and a compression-side damping valve V2 which are provided in series in the middle of the bypass circuit BP as in the embodiment of FIG. An oil passage L is connected between a bypass circuit BP between the side damping valve V1 and the pressure side damping valve V2 and the pressurization type tank T.

The vibration damping device of FIG. 3 is partially modified as compared with the embodiment shown in FIG.

Therefore, the modified part will be mainly described below, and other configurations will be denoted by the same reference numerals as those in FIG. 2 and the detailed description thereof will be omitted.

That is, in the vibration damping device according to this embodiment, in the oil passage L connecting the damping mechanism 4 and the reservoir tank T,
The arrangement of the throttle 5 (see FIG. 2) is omitted, and the oil passage L
It is assumed that the communication passage L1 that communicates with the pressure side chamber R2 of the hydraulic cylinder 1 is omitted.

Then, the vibration damping device is provided with a reservoir tank T.
The pressure side chamber R1 and the compression side chamber R2
Prevents cavitation. Further, a relief valve 7 for setting the discharge pressure from the hydraulic pressure source P is arranged between the oil passage L and the supply passage L2 communicating the hydraulic pressure source P with the electromagnetic proportional directional flow control valve 2.

In the reservoir tank T, a filter T1 connected to the so-called suction side is housed.

On the other hand, in the embodiment shown in FIG. 3,
The hydraulic cylinder 1 is set to function as a so-called double rod type.

That is, the hydraulic cylinder 1 in this embodiment
It is assumed that the rod body 11 c set to have the same diameter as the basic diameter of the rod body 12 is erected from the lower bottom portion of the cylinder body 11 toward the piston body 13 side at the axial center portion of the cylinder body 11.

The piston body 13 is inserted through the axial center of the rod body 11c so that the tip side of the rod body 11c can be retracted. 12a is formed so that the rod body 11c can be inserted through the axial center portion of the rod 12a.

Therefore, according to this embodiment, the installation of the pressurizing type reservoir tank T has the advantage that the hydraulic cylinder 1 can prevent deficiency of cavitation during expansion and contraction.

Further, since the hydraulic cylinder 1 is of a so-called double rod type, the hydraulic pressures in the expansion side chamber R1 and the compression side chamber R2 are the same, and therefore cavitation occurs when the hydraulic cylinder 1 expands and contracts. There is an advantage that it can be greatly reduced.

The above description has been made by taking as an example the case where the vibration damping device according to the present invention is for vibration damping in a building. However, according to the configuration of the present invention, not only for a building but also for a vehicle or the like. Of course, it can also be used for damping other objects.

[0075]

As described above, according to the invention of each claim, the hydraulic pressure from the hydraulic pressure source is supplied to and discharged from the hydraulic cylinder via the control valve, so that the hydraulic cylinder can be actively expanded and contracted. It is thus possible, thus enabling active or active damping of the object based on the situation in which the hydraulic cylinder is extended or contracted.

Further, according to the present invention, the control valve is switched to the shut-off position and the switching valve is switched to the communication position at the time of an abnormality due to a failure of the electric system or the like, so that the hydraulic cylinder expands and contracts with the intervention of the damping mechanism. Therefore, even if an external force acts on the hydraulic cylinder through the object, the hydraulic cylinder expands and contracts under the generation of the damping force, and the object is moved by the external force. It becomes possible to passively suppress the object, that is, passively suppress it.

Further, according to the first aspect of the present invention, since the throttle is provided in the middle of the communication passage, pressure can be built up in the bypass circuit, and as a result, cavitation is prevented in the expansion side chamber and the compression side chamber of the hydraulic cylinder. Occurrence can be prevented.

According to the second aspect of the invention, since the bypass circuit is connected to the pressurizing tank, the pressure always rises in the bypass circuit and it is possible to prevent the occurrence of cavitation in the expansion side chamber and the compression side chamber.

According to the present invention, the electromagnetic proportional directional flow control valve and the electromagnetic switching valve are utilized by the controller based on various signals such as signals from the detecting means for detecting the expansion / contraction state of the hydraulic cylinder and other detecting means. By setting so as to control the hydraulic power source, there is an advantage that so-called automatic control becomes possible and the vibration damping function is improved.

Further, as shown in the example of FIG. 1, the damping mechanism is integrally connected to the outer periphery of the hydraulic cylinder, and the electromagnetic switching valve and the electromagnetic proportional directional flow control valve are integrally connected to the damping mechanism. By forming it, it becomes possible to connect the respective constituent members without requiring piping, which is advantageous in that it is so-called compact and the disposing work thereof is facilitated.

As a result, according to the present invention, it can be used not only for a building such as a long and narrow building but also for the damping of other objects such as a vehicle as long as the purpose is damping. It has the advantage of being optimal.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of a vibration damping device according to the present invention in a partial cross section.

FIG. 2 is a circuit diagram showing a vibration damping device according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a vibration damping device according to another embodiment of the present invention.

FIG. 4 is a partial view showing a usage state of a vibration damping device as a conventional example.

[Explanation of symbols]

1 hydraulic cylinder 2 Control valve, electromagnetic proportional directional flow control valve 3 Solenoid switching valve that is a switching valve 4 damping mechanism 5 aperture 6 check valves 11 cylinder body 12 rod body 14 Detection means 26 Shut-off position 34 Communication position 41a, 41b diaphragm 42a, 42b check valve 43a, 43b relief valve BP bypass circuit C controller P hydraulic power source T tank R1 extension room R2 pressure side chamber M1 First main circuit M2 Second main circuit V1 extension side damping valve V2 pressure side damping valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-107640 (JP, A) JP-A-3-186602 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16F 9/32 F16F 15/02 E04H 9/02 341

Claims (2)

(57) [Claims] 1. A first main circuit and a second main circuit are respectively connected to an expansion side chamber and a compression side chamber of a hydraulic cylinder partitioned in a cylinder body, and each main circuit is connected to a hydraulic source or a tank via a control valve. A bypass circuit is connected between the main circuits, a switching valve and a damping mechanism are provided in the middle of the bypass circuit, and the switching valve is in the cutoff position when the control valve is in the communication position.
On the contrary, in the vibration damping device in which the switching valve is in the communication position when the control valve is in the shut-off position, the damping mechanism is composed of an expansion side damping valve and a pressure side damping valve that are provided in series in the middle of the bypass circuit, the extension side damping valve and the compression side damping valve and the pixel
A throttle, a check valve, and a relief valve are installed in parallel.
Further, a communication passage is connected between the bypass circuit between the expansion-side damping valve and the compression-side damping valve and the pressure- side chamber of the hydraulic cylinder. A vibration damping device, characterized in that a check valve for allowing the flow of oil only to the chamber is provided, and an oil passage is connected between a communication passage between the throttle and the check valve and a tank. 2. A first main circuit and a second main circuit are respectively connected to the expansion side chamber and the compression side chamber of a hydraulic cylinder partitioned in the cylinder body, and each main circuit is connected to a hydraulic pressure source or a tank via a control valve. A bypass circuit is connected between the main circuits, a switching valve and a damping mechanism are provided in the middle of the bypass circuit, and the switching valve is in the cutoff position when the control valve is in the communication position.
On the contrary, in the vibration damping device in which the switching valve is in the communication position when the control valve is in the shut-off position, the above tank is set as a pressurized tank, and the damping mechanism is provided in the middle of the bypass circuit on the extension side. It consists of a damping valve and a compression side damping valve, and the expansion side damping valve and the compression side damping valve each have a throttle,
A check valve and a relief valve are provided in parallel,
Furthermore , an oil passage is connected between a bypass circuit between the expansion side damping valve and the compression side damping valve and the pressurization type tank.