JP6773278B2 - Vibration reduction device - Google Patents

Description

The present invention relates to a vibration reduction device such as an oil damper for absorbing vibration energy acting on a building and suppressing displacement, and particularly a vibration reduction device provided with a wind lock mechanism.

For example, when a mid-to-high-rise building receives a huge earthquake, the weakest layer of the building is damaged and its yield strength begins to decrease, seismic energy (vibration energy) concentrates on this layer, causing layer collapse, and the other layers are sound. Even though the energy is secured, the phenomenon that the building collapses due to the layer collapse mode occurs. Moreover, even if the collapse does not occur, the damage to the weakest layer will be enormous, and it will be difficult to recover by repair.

On the other hand, as is well known, for buildings such as office buildings, public facilities, and apartment buildings, the seismic isolation layer between the upper structure and the lower structure, such as between the building body and the foundation, is exempt from laminated rubber. In the event of an earthquake, a seismic device is installed to shift the natural period of the superstructure from the predominant period zone of the seismic motion to the long period side, and the response acceleration is reduced to suppress the shaking.

In addition, by installing oil dampers (vibration reduction device, vibration control / vibration control device) in the frame surface surrounded by columns and beams of the building, the response of the building during an earthquake or strong wind is reduced. There is something.

Further, in some cases, an oil damper is provided in parallel with the seismic isolation device in the seismic isolation layer between the upper structure and the lower structure, such as between the building body and the foundation.

Here, the oil damper is the most common vibration damping device that imparts viscous damping, and usually a reaction force / damping force proportional to the relative velocity at both ends of the device is generated, and when the relative velocity becomes excessive, When the reaction force reaches the relief load, the relief valve provided inside the device is activated so that the reaction force reaches a plateau.

For this reason, if an oil damper is installed together with a seismic isolation device in the seismic isolation layer between the upper structure and the lower structure, such as between the building body and the foundation, the damping force (damping coefficient) of the oil damper during a large earthquake × The larger the relative velocity at both ends of the damper, but the relief load reaches a plateau), the greater the energy absorption, and the effect of suppressing the displacement of the seismic isolation layer / superstructure can be obtained. On the other hand, if the damping force of the oil damper is large, the vibration of the ground is transmitted to the upper structure through the oil damper at the time of a small and medium-sized earthquake, and the vibration insulation performance (seismic isolation performance) is deteriorated.

Therefore, if the damping force of the oil damper is increased and the displacement of the seismic isolation layer is suppressed too small, the seismic isolation device cannot sufficiently exert the response reduction effect.

On the other hand, if the damping force of the oil damper is reduced, it becomes difficult for the vibration of the ground to be transmitted to the upper structure to be seismically isolated, and while high vibration insulation can be ensured, the seismic isolation layer can be used when a large vibration is input during a large earthquake. The displacement becomes large, and in some cases, the superstructure may collide with an adjacent building or the like, or the limit displacement of the seismic isolation device may be exceeded.

That is, the oil damper installed in parallel with the seismic isolation device in the seismic isolation layer generates a reaction force (damping force) proportional to the relative speed at both ends of the damper, and when this reaction force reaches the relief load, the relief valve operates. Since the mechanism is such that the reaction force is leveled off, the seismic isolation effect that blocks the vibration of the lower structure (foundation) and prevents it from being transmitted to the upper structure during an earthquake is a seismic isolation device such as laminated rubber (seismic isolation bearing). The smaller the horizontal rigidity of the oil damper and the smaller the seismic isolation coefficient of the oil damper, the larger the value.
However, with such a configuration, there arises a problem that the horizontal displacement of the superstructure becomes large with respect to the wind load and the habitability of the building deteriorates.

For this reason, conventional methods of using lead or sliding bearings in the seismic isolation device to restrain the movement of the superstructure with respect to the wind, or shear pins (pins that break with a constant shear force) when a typhoon or the like approaches. Proposed and put into practical use a method of fastening the lower structure and the upper structure to restrain movement, a method of detecting wind and earthquake with a sensor, inserting and removing shear pins (lock pins), and increasing or decreasing the damping coefficient of the oil damper. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-176525

However, the method of restraining the movement of the superstructure with respect to the wind by using lead or a sliding bearing in the seismic isolation device does not stop the movement when the wind load becomes large, and there is a possibility that a large residual displacement occurs.

In addition, when a typhoon or the like approaches, the method of fastening the lower structure and the upper structure with a shear pin and restraining the movement requires the trouble of installing and releasing the pin before the wind becomes a problem. The reliability remains questionable as to whether this work can be done without fail.

Further, there is a problem in the long-term durability and reliability of electric parts in the method of detecting wind or earthquake with a sensor and inserting / removing the shear pin or increasing / decreasing the damping coefficient of the oil damper.

In view of the above circumstances, the present invention automatically restrains and releases the restraint without using external electric power, and while moving and restraining the lower structure and the upper structure under a wind load, the restraint is released in the event of an earthquake to provide a seismic isolation effect. It is an object of the present invention to provide a passive type vibration reduction device that can be reliably exerted.

To achieve the above object, the present invention provides the following means.

The vibration reducing device of the present invention is a vibration reducing device for reducing relative vibration between two members that vibrate relative to each other, and is a cylinder arranged with one end connected to one member and the inside of the cylinder. A piston that divides the pressure into a first compartment and a second compartment, and a piston that is arranged by connecting one end to the piston and extending outward in the axial direction of the cylinder and connecting the other end to the other member. The rod is provided with the first compartment and the working fluid filled in the second compartment, and the working fluid flows between the first compartment and the second compartment during normal operation and when wind load is applied. A wind lock mechanism that communicates the first compartment and the second compartment when a vibration larger than the wind load acts, and reduces the damping coefficient when a preset reaction force exceeds a preset value. The wind lock mechanism includes a lock cylinder having a cylinder chamber inside, a lock piston that partitions the inside of the lock cylinder into one lock cylinder chamber and the other lock cylinder chamber, and the lock piston of the other. A spring member urging the lock cylinder chamber side, a first lock bypass that communicates the one lock cylinder chamber with the first compartment, and a second lock bypass that communicates the other lock cylinder chamber with the second compartment. A lock bypass, a damping valve provided on the second lock bypass for adjusting the amount of working fluid flowing through the second lock bypass, and the pressure of the working fluid in the first compartment and the second compartment. A pressure detection mechanism for supplying and discharging a working fluid to and from the other lock cylinder chamber is provided, and the pressure detection mechanism communicates with the other lock cylinder chamber and the pressure. A first pressure detection bypass that communicates the detection chamber with the first compartment, a second pressure detection bypass that communicates the pressure detection chamber with the second compartment, and the first compartment and / or the second compartment. A valve body that opens and closes the first pressure detection bypass and / or the second pressure detection bypass according to the pressure difference between the chamber and the working fluid in the pressure detection chamber is provided, and the first compartment is more than the pressure detection chamber. Alternatively, in a state where the second compartment becomes high pressure and the valve body opens the first pressure detection bypass or the second pressure detection bypass, the pressure is increased from the first pressure detection bypass or the second pressure detection bypass. In a state where the working fluid is configured to flow into the pressure detection chamber and the lock piston is urged by the spring member and arranged on the other lock cylinder chamber side, the front The first lock bypass and the second lock bypass are shut off through the communication groove formed in the lock piston to enter a locked state, and the working fluid flows from the pressure detection chamber into the other lock cylinder chamber and is pressurized. In a state where the lock piston is arranged on the one lock cylinder chamber side, the first lock bypass and the second lock bypass are configured to communicate with each other.

Further, in the vibration reducing device of the present invention, it is more desirable that the wind locking mechanism includes an adjusting mechanism for adjusting the urging force acting on the lock piston by the spring member.

In the vibration reduction device of the present invention, restraint and release are automatically performed without using external electric power, and while the lower structure and the upper structure are moved and restrained under a wind load, the restraint is released at the time of an earthquake to obtain a seismic isolation effect. It can be surely demonstrated.

It is a figure which shows the state which provided the vibration reduction device which concerns on one Embodiment of this invention in parallel with the seismic isolation device in the seismic isolation layer. It is sectional drawing which shows the vibration reduction apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the wind lock mechanism (variable damping mechanism) of the vibration reduction apparatus which concerns on one Embodiment of this invention. FIG. 3 is a view taken along the line X1-X1 when the lock piston moves upward. It is a figure which shows the characteristic (relationship between load and speed) of the vibration reduction apparatus which concerns on one Embodiment of this invention. It is a figure which shows the characteristic (relationship between load and speed) of the vibration reduction apparatus which concerns on one Embodiment of this invention. It is a figure which shows the state of the wind lock mechanism of the vibration reduction device which concerns on one Embodiment of this invention at the time of a normal time | wind load action, (a) is a vertical sectional view, (b) is X1-X1 of (a). It is a line arrow view. It is a figure which shows the state at the time of an earthquake (when the trigger is activated) of the wind lock mechanism of the vibration reduction device which concerns on one Embodiment of this invention, (a) is a vertical sectional view, (b) is X1-X1 of (a). It is a line arrow view. It is a figure which shows the state at the time of an earthquake (at the time of pressure drop) of the wind lock mechanism of the vibration reduction device which concerns on one Embodiment of this invention, (a) is a vertical sectional view, (b) is X1-X1 of (a). It is a line arrow view. It is a figure which shows the state after the earthquake and the normal state of the wind lock mechanism of the vibration reduction device which concerns on one Embodiment of this invention, (a) is a vertical sectional view, (b) is the X1-X1 line arrow of (a). It is a visual view.

Hereinafter, the vibration reducing device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 10.

Here, in the present embodiment, as shown in FIG. 1, the vibration reducing device A according to the present invention is laminated rubber on the seismic isolation layer 3 between the upper structure 1 and the lower structure 2, such as between the building body and the foundation. It will be described as being provided in parallel with the seismic isolation device 4 such as the above, and for attenuating the seismic energy transmitted to the superstructure 1 at the time of an earthquake.

The vibration reduction device A of the present embodiment is an oil damper that reduces the damping coefficient in the event of a large earthquake. It is configured to release (restraint) and function as an oil damper with a normal damping coefficient.

Specifically, as shown in FIGS. 1 and 2, the vibration reducing device A of the present embodiment has a cylinder 5 arranged by connecting one end 5a side to a lower structure (one member) 2 such as a foundation. , A piston 8 that divides the inside of the cylinder 5 into one oil chamber (first compartment) 6 and the other oil chamber (second compartment) 7, and one end connected to the piston 8 to the outside in the axial direction of the cylinder 5. It is configured to include a piston rod 9 which is extended to the above and is arranged by connecting the other end 5b side to the upper structure (the other member) 1. Further, one oil chamber 6 and the other oil chamber 7 of the piston 8 are filled with hydraulic oil (hydraulic fluid) 10.

Further, a bypass 11 for communicating the one oil chamber 6 and the other oil chamber 7 is provided, and in the present embodiment, the bypass 11 is provided so as to penetrate the piston 8.

The bypass 11 is provided with a relief valve 13. As a result, the relative speed of the pistons 8 (both ends of the device) becomes excessive (as the reaction force reaches the relief load), and the relief valve 13 operates to level off the reaction force.

Further, the vibration reduction device A of the present embodiment includes a wind lock mechanism 20.

As shown in FIGS. 2, 3 and 4, the wind lock mechanism 20 of the present embodiment is provided on the outside of the cylinder 5, and the lock cylinder 21 and the inside of the lock cylinder 21 are one of the lock cylinder chambers 22. The lock piston 24 is divided into the other lock cylinder chamber 23, and the lock piston 24 is provided in one lock cylinder chamber 22 and presses one end of the lock piston 24 to urge the lock piston 24 toward the other lock cylinder chamber 23. According to the pressure of the spring member 25, the adjusting mechanism (adjusting screw) 26 for adjusting the urging force applied to the lock piston 24 by the spring member 25, and the hydraulic oil 10 of one oil chamber 6 and the other oil chamber 7. A pressure detecting mechanism 27 for supplying and discharging the hydraulic oil 10 to the other lock cylinder chamber 23 is provided.

Further, the wind lock mechanism 20 is provided in the other lock cylinder chamber 23, and is a stopper that abuts the other end of the lock piston 24 and restricts further movement of the lock cylinder 21 to the other lock cylinder chamber 23 side. It has 28. Further, the lock cylinder 21 is provided with a step portion 29 that, when the lock piston 24 moves to one lock cylinder chamber 22 side to some extent, abuts one end and restricts the further movement to the other lock cylinder chamber 22 side. Has been done.

Further, the wind lock mechanism 20 includes a first lock bypass 30 that communicates one oil chamber 6 and a lock cylinder chamber, and a second lock bypass 31 that communicates the other oil chamber 7 and the lock cylinder chamber. Further, the second lock bypass 31 is provided with a damping valve 32, and the amount of oil flowing through the second lock bypass 31 (the distribution area of the hydraulic oil 10 of the second lock bypass 31) can be adjusted by the damping valve 32. It is said that.

A communication groove 42 for communicating the first lock bypass 30 and the second lock bypass 31 is formed on the outer peripheral surface of the middle stage portion of the lock piston 24. Then, in a state where the other end abuts on the stopper 28 and the lock piston 24 cannot move further to the other lock cylinder chamber 23 side, the communication groove 42 is separated from the first lock bypass 30 and cannot communicate with the lock piston 24. Is moved to one of the lock cylinder chambers 22 side against the urging of the spring member 25, and the communication groove 42 is connected to the first lock bypass 30 according to the amount of movement, so that the communication groove 42 communicates with the first lock bypass 30.

Further, in the present embodiment, even in a state where one end of the lock piston 24 is in contact with the step portion 29 of the lock cylinder 21, the hydraulic oil 10 communicates without the second lock bypass 31 being completely blocked by the lock piston 24. It is configured to circulate in the groove 42.

The pressure detection mechanism 27 of the present embodiment is provided on the outside of the cylinder 5, and has a pressure detection chamber 33 communicating with the other lock cylinder chamber 23 of the lock cylinder 21, a pressure detection chamber 33, and one oil chamber 6. The first pressure detection bypass 34 connected to the pressure detection chamber 33 and the first lock bypass 30 so as to communicate with each other, and the pressure detection chamber 33 and the second lock bypass so as to communicate with the pressure detection chamber 33 and the other oil chamber 7. The pressure detection chamber 33 is urged to close the opening (inflow port) of the second pressure detection bypass 35 connected to 31 and the first pressure detection bypass 34 connected to the pressure detection chamber 33 by the spring member 36. The pressure detection chamber 33 closes the opening (inflow port) of the first check valve (pressure valve) 38 having the valve body 37 and the second pressure detection bypass 35 connected to the pressure detection chamber 33 by the spring member 39. It is configured to include a second check valve (pressure valve) 41 having a valve body 40 urged from the side.

Further, in the present embodiment, the first check valve 38 and the second check valve 41 block the opening of the first pressure detection bypass 34 and the opening of the second pressure detection bypass 35, respectively. With 37 and 40 arranged, a slight gap H is left so as not to completely block each opening, and the hydraulic oil 10 is slightly between the pressure detection chamber 33 and the pressure detection bypasses 34 and 35. It is configured for distribution.

In addition, the whole or a part of the wind lock mechanism 20 may be provided in the piston 8 to make the device A compact.

Then, in the vibration reducing device A of the present embodiment configured as described above, the first lock bypass 30 is provided with the wind lock mechanism 20 and the lock cylinder chambers 22 and 23 arranged on both sides of the lock piston 24 are connected to each other. Since the second lock bypass 31 is provided, when the pressure difference between the oil chambers 6 and 7 and the pressure difference between the lock cylinder chambers 22 and 23 becomes larger than a predetermined value, the first lock bypass 30 and the second lock bypass 30 are provided. 31 can be opened and communicated to reduce the damping coefficient. That is, since the reaction force of the vibration reducing device (oil damper) A is the product of the pressure difference between the oil chambers 6 and 7 and the pressure receiving area of the piston 8, the damping coefficient can be changed by the damper reaction force.

Further, in the vibration reduction device A of the present embodiment, as shown in FIGS. 5 and 6, the lock piston 24 closes the first lock bypass 30 and the second lock bypass 31 in the initial state, and the wind is set as a locked state with an attenuation coefficient of ∞. Resists loads and small and medium-sized earthquakes. At the time of an earthquake, the first lock bypass 30 and the second lock bypass 31 open and function as a normal oil damper having a damping coefficient C2. That is, the conventional wind-resistant shear pin is a mechanism for releasing the movement restraint (lock) by breaking or releasing the pin member that bears the shearing force, but in the vibration reducing device A of the present embodiment, a predetermined reaction force When the value exceeds, the damping coefficient changes (decreases) to release the movement restraint (lock). In FIGS. 5 and 6, the relative velocity at both ends of the damper is defined as the velocity v.

First, when the pressures in the oil chambers 6 and 7 are less than or equal to a predetermined value (less than), the other lock cylinder chamber 23 is not pressurized. Therefore, the lock piston 24 is pressed downward by the spring member 25, the gap between the lock piston 24 and the inner surface of the lock cylinder 21 is closed, and the hydraulic oil 10 does not flow to the first lock bypass 30 and the second lock bypass 31. .. The damping coefficient in the state where the first lock bypass 30 and the second lock bypass 31 are blocked by the wind lock mechanism 20 is set to C1≈∞. (Left side of Fig. 6)

When the pressure in one oil chamber 6 or the other oil chamber 7 becomes larger than (or higher than) a predetermined value, the hydraulic oil 10 flows into the other lock cylinder chamber 23 through the check valves (pressure valves) 38 and 41. Push up the lock piston 24. As a result, the hydraulic oil 10 flows in the gap between the lock piston 24 and the inner surface of the lock cylinder 21, and the first lock bypass 30 and the second lock bypass 31 communicate with each other. The damping coefficient by the damping valve 32 provided in the middle of the second lock bypass 31 is defined as C2. (Center of Fig. 6)

Next, even when the damper reaction force becomes small and the pressures in the oil chambers 6 and 7 decrease, the pressure in the other lock cylinder chamber 23 is maintained by the presence of the check valves 38 and 41. As a result, the lock bypasses 30 and 31 remain in communication with each other by the wind lock mechanism (variable damping mechanism) 20. That is, once the damping coefficient becomes small, it is maintained at that damping coefficient during an earthquake. As a result, the damper has a trigger mechanism that switches the damping coefficient from C1 to C2 with a predetermined load. (Right side of Fig. 6)

When time has passed after the earthquake, the pressure of the other lock cylinder chamber 23 drops by allowing the hydraulic oil 10 to slightly flow out from the gap H of the check valves 38 and 41, and the spring of the wind lock mechanism 20. The lock piston 24 is pushed down by the member 25, and the first lock bypass 30 and the second lock bypass 31 are closed. That is, it automatically returns to the initial state over time. (Left side of Fig. 6)

More specifically, the wind lock mechanism 20 and the changes in the damping coefficient will be described in chronological order. Since the wind load is smaller than the seismic load in a general building, the explanation will be made on the assumption that the wind load <seismic load.

First, as shown in FIGS. 6 and 7, the oil chambers 6 and 7 are not pressurized and the lock piston 24 is pushed down by the spring member at all times (normal time) and under wind load. As a result, the hydraulic oil 10 does not flow through the first lock bypass 30 and the second lock bypass 31 that connect the lock cylinder chambers, and the damping coefficient becomes C1≈∞ (locked state).

Next, at the time of an earthquake (when the trigger is activated), as shown in FIGS. 6 and 8, the piston 8 is relatively displaced in the cylinder 5, so that hydraulic pressure acts on the check valves 38 and 41, and vice versa. Check valves 38 and 41 open. As a result, the other lock cylinder chamber 23 is pressurized, the lock piston 24 is raised, the first lock bypass 30 and the second lock bypass 31 are communicated with each other, and the damping coefficient is automatically switched from C1 to C2, which is normal. It becomes like an oil damper.

Incidentally, the switching load F _A, by operating the adjusting mechanism (adjusting screw) 26, it is possible to freely set to any value below the relief load.

Next, when the damper reaction force decreases and the pressure in the oil chambers 6 and 7 decreases during an earthquake, the check valves 38 and 41 automatically close and the other lock cylinder, as shown in FIGS. 6 and 9. The chamber 23 is held in a pressurized state. As a result, the lock piston 24 is held in a pushed-up state, and the first lock bypass 30 and the second lock bypass 31 continue to communicate with each other. Therefore, the damping coefficient is maintained at C2.

Next, after the earthquake (and always), the oil chambers 6 and 7 are no longer pressurized, and as shown in FIG. 10, the hydraulic oil 10 is released from a slight gap in the check valves 38 and 41 of the pressure detection mechanism 27. Since it flows out, the lock piston 24 is pushed down by the spring member 25. As a result, the hydraulic oil 10 does not flow through the lock bypasses 30 and 31, and the damping coefficient becomes C1≈∞ (locked state). That is, after an earthquake, it automatically returns to the above-mentioned initial state under constant wind load.

In the vibration reducing device A of the present embodiment, since the relief valve 13 is provided on the piston 8, the damper reaction force reaches a plateau at Fr (relief load). That is, the relief valve 13 is provided with a fail-safe mechanism that does not generate an excessive reaction force.

Therefore, in the vibration reduction device (variable damping oil damper) A of the present embodiment, the damping coefficient is increased at all times and at the time of wind load to put the displacement restraint (locked) state, and at the time of an earthquake, the damping coefficient is about the same as that of a normal oil damper. Can be reduced to suppress response displacement.

Further, since it is not a conventional mechanical shear pin type, an impact load such as a pin breaking or dropping does not occur. Moreover, unlike windproof shear pins, there is no need to manually re-install the shear pins after an earthquake. Further, since the automatic return can be realized by a slight outflow of the hydraulic oil 10 from the gap H of the check valves 38 and 41, the automatic return function can be realized at low cost without using a complicated mechanism.

Further, it sets the load F _A for changing the damping coefficient to any load below the relief load. In the case where the level 1 ground motion reproduction period of about 50 years to reach the relief load, it is preferable to set the change load F _A near relief load.

Further, the unlocking force F _A may be set to any value below the relief load. Reaction force are those obtained by multiplying the piston area Ap to differential pressure between the oil chambers 6 and 7, the spring as the lock piston 24 of the air lock mechanism 20 when the pressure F _{A /} Ap oil chambers 6 and 7 is pushed up by adjusting member 25 (adjustment screw 26), able to set the lock release load F _a easily.

In addition, since it is a lock mechanism that restrains displacement during wind load and functions (can also be used) as a normal oil damper during an earthquake, it is more efficient than installing a device with only a simple lock mechanism and an oil damper. Further, the space for installing the device in the seismic isolation layer 3 can be saved.

Further, since the reaction force is basically an oil damper that depends on the speed (relative speed at both ends of the device), it can follow slow changes such as creep and temperature shrinkage without generating a reaction force.

Further, the vibration reducing device A of the present embodiment has exactly the same appearance and joint as the conventional oil damper, and the installation method is not changed. Therefore, no special skill is required for construction.

Further, since the vibration reduction device A of the present embodiment is a passive type oil damper with a lock function, it does not require external energy such as a power source.

Therefore, according to the vibration reduction device A of the present embodiment, restraint and release are automatically performed without using external electric power, and the lower structure 2 and the upper structure 1 are moved and restrained at the time of wind load, and restrained at the time of an earthquake. It is possible to release the seismic isolation effect and ensure the seismic isolation effect.

Although one embodiment of the vibration reducing device according to the present invention has been described above, the present invention is not limited to the above one embodiment and can be appropriately modified without departing from the spirit of the present invention.

The hydraulic fluid according to the present invention does not have to be limited to the hydraulic oil, and any liquid or gas can be used.

1 Upper structure 2 Lower structure 3 Seismic isolation layer 4 Seismic isolation device 5 Cylinder 5a One end 5b Other end 6 One oil chamber (first compartment)
7 The other oil chamber (second compartment)
8 Piston 9 Piston rod 10 Hydraulic oil (hydraulic fluid)
11 Bypass 13 Relief valve 20 Wind lock mechanism (variable damping mechanism)
21 Lock cylinder 22 One lock cylinder chamber 23 The other lock cylinder chamber 24 Lock piston 25 Spring member 26 Adjustment mechanism (adjustment screw)
27 Pressure detection mechanism 28 Stopper 29 Step 30 First lock bypass 31 Second lock bypass 32 Damping valve 33 Pressure detection chamber 34 First pressure detection bypass 35 Second pressure detection bypass 36 Spring member 37 Valve body 38 First check valve 39 Spring member 40 Valve body 41 Second check valve 42 Communication groove A Vibration reduction device H Gap

Claims (2)

A vibration reduction device for reducing the relative vibration between two members that vibrate relative to each other.
A cylinder arranged by connecting one end to one member, a piston that divides the inside of the cylinder into a first compartment and a second compartment, and an axially outer side of the cylinder by connecting one end to the piston. It is provided with a piston rod extending to the above and connecting the other end to the other member, and a working fluid filled in the first compartment and the second compartment.
The flow of the working fluid between the first compartment and the second compartment is blocked during normal operation and when a wind load is applied, and when a vibration larger than the wind load acts, the first compartment and the second compartment are used. Equipped with a wind lock mechanism that communicates the compartments and reduces the damping coefficient when a preset reaction force is exceeded .
The wind lock mechanism has a lock cylinder having a cylinder chamber inside, a lock piston that divides the inside of the lock cylinder into one lock cylinder chamber and the other lock cylinder chamber, and the lock piston is divided into the other lock cylinder. A spring member urging the chamber side, a first lock bypass that communicates the one lock cylinder chamber with the first compartment, and a second lock bypass that communicates the other lock cylinder chamber with the second compartment. And a damping valve provided in the second lock bypass for adjusting the amount of working fluid flowing through the second lock bypass, and according to the pressure of the working fluid in the first and second compartments. A pressure detection mechanism for supplying and discharging the working fluid to and from the other lock cylinder chamber is provided.
The pressure detection mechanism communicates with the other lock cylinder chamber, the pressure detection chamber communicates with the first compartment, the pressure detection bypass communicates with the first compartment, and the pressure detection chamber communicates with the second compartment. The first pressure detection bypass and / or the second pressure according to the pressure difference between the first compartment and / or the working fluid in the second compartment and the pressure detection chamber. Equipped with a valve body that opens and closes the detection bypass
The first pressure detection is performed in a state where the pressure of the first compartment or the second compartment is higher than that of the pressure detection chamber and the valve body opens the first pressure detection bypass or the second pressure detection bypass. High pressure working fluid is configured to flow into the pressure sensing chamber from the bypass or the second pressure sensing bypass.
Further, in a state where the lock piston is urged by the spring member and arranged on the other lock cylinder chamber side, the first lock bypass and the second lock bypass are blocked through a communication groove formed in the lock piston. And locked
The first lock bypass and the second lock bypass are in a state where the working fluid flows from the pressure detection chamber into the other lock cylinder chamber and is pressurized, and the lock piston is arranged on the one lock cylinder chamber side. A vibration reduction device characterized in that it is configured to communicate with each other . In the vibration reduction device according to claim 1 ,
A vibration reducing device, characterized in that the wind locking mechanism includes an adjusting mechanism for adjusting an urging force acting on the lock piston by the spring member.

Images