JP6736411B2 - Vibration detection valve and damper equipped with vibration detection valve - Google Patents

Description

The present invention relates to a vibration detecting valve and a damper including the vibration detecting valve.

Patent Document 1 discloses a conventional damper. The damper includes a cylinder tube, a piston, a rod, a first communication passage, a first check valve, a reservoir tank, a second communication passage, a damping valve, a lock mechanism, a third communication passage, and a second check valve. There is. The piston is slidably housed in the cylinder tube. This piston divides the inside of the cylinder tube into a rod side chamber and a piston side chamber. The rod has a tip portion connected to a piston and is reciprocally inserted into a cylinder tube. The first communication passage connects the rod side chamber and the piston side chamber. The first check valve is provided in the middle of the first communication passage. The first check valve allows the flow of hydraulic oil from the piston side chamber to the rod side chamber and blocks the reverse flow. The second communication passage connects the rod side chamber and the reservoir tank. The damping valve and the lock mechanism are provided in the middle of the second communication passage. The lock mechanism has a lock valve and an electromagnetic switching valve. The switching valve is closed when de-energized and opens when energized. The lock valve opens when the switching valve opens and closes when the switching valve closes. The second communication passage is in a communication state when the lock valve is opened, and is in a cutoff state when the lock valve is closed. The third communication passage communicates the reservoir tank with the piston side chamber. The second check valve is provided in the middle of the third communication passage. The second check valve allows the flow of the hydraulic oil from the reservoir tank to the piston side chamber and blocks the reverse flow.

When the lock valve is opened to bring the second communication passage into the communication state, the damper is allowed to expand and contract because the flow of the hydraulic oil from the rod side chamber to the reservoir tank is allowed. On the other hand, when this damper closes the second communication passage by closing the lock valve, the flow of hydraulic oil from the rod-side chamber to the reservoir tank is blocked, so that the damper is in a locked state in which it cannot expand and contract.

When used in the vibration isolator, this damper energizes the switching valve based on signals from a speed sensor that detects the expansion/contraction speed of the damper and a pressure sensor that detects the pressure on the upstream side of the lock valve. In other words, when the damper determines that an earthquake has occurred based on the signals from the sensors, the switching valve is energized to open the lock valve in the lock mechanism and enter the unlocked state. As a result, the damper expands and contracts due to the earthquake, and the damping force generated at that time can quickly suppress the rolling of the building. On the other hand, when it is determined from the signals of the sensors that the wind is strong, the damper keeps the lock valve in the lock mechanism closed and maintains the locked state. Therefore, expansion and contraction of the damper can be prevented, and shaking of the building due to strong wind can be prevented.

JP, 2005-351320, A

However, the damper of Patent Document 1 needs to energize the switching valve of the lock mechanism in order to switch from the locked state to the unlocked state. Thus, this damper needs power. Further, this damper has a complicated structure because the opening/closing control of the switching valve is performed by the outputs of various sensors.

The present invention has been made in view of the above conventional circumstances, and includes a vibration detection valve that does not require electric power and can be opened and closed satisfactorily with only a vibration input with a simple configuration, and a vibration detection valve. It is a problem to be solved to provide a damper.

The vibration detection valve of the first invention comprises a housing, a first moving body, and an elastic body. The housing has an internal space, an inflow port, and an outflow port. The internal space has a receiving surface. The inflow port communicates with the internal space. The outflow port communicates with an outflow port opened at the center of the receiving surface. The first moving body is movably accommodated in the internal space so as to open and close the outlet. The first moving body is opposed to the receiving surface, and when the central portion is positioned in the closed state in which the outlet is closed, the first moving body is curved so as to gradually separate from the receiving surface from the central portion toward the outer edge portion in the vertical cross section. It has a first surface that bulges into a planar shape. The elastic body applies an elastic force in a direction in which the first moving body is pressed against the receiving surface.

When the first moving body, which is pressed against the receiving surface by the elastic body, is positioned in the closed state in which the outlet is closed, the vibration detecting valve gradually receives the receiving surface from the central portion toward the outer edge portion in the vertical cross section. It swells in a curved surface shape away from. Therefore, when the vibration detection valve receives a vibration in the left-right direction, the first moving body moves so as to roll, and the outflow port is opened to open the valve. As described above, the vibration detection valve has a small movement resistance because the first moving body does not move by sliding on the receiving surface but moves by rolling. Therefore, the vibration detection valve can be opened and closed with good response even with a small vibration.

Therefore, this vibration detection valve does not require electric power, and can be opened and closed satisfactorily only by inputting vibration with a simple structure.

In the vibration valve of the first aspect of the invention, the receiving surface may be recessed into a curved surface shape in the vertical cross section. In this case, the vibration detection valve can stably open and close because the movement range of the first moving body is restricted by the receiving surface.

Vibration sensing valve of the first invention is Ru Tei comprises a second movable body. In the vertical cross section of the first moving body in the valve closed state, the second surface opposite to the first surface bulges into a curved surface shape. The second moving body is movably housed in the internal space. Further, the elastic force of the elastic body is applied to the second moving body in a direction in which the first moving body is sandwiched between the second moving body and the receiving surface and the first moving body is pressed against the receiving surface. Further, the second moving body is directed from the central portion of the pressing surface toward the outer edge portion in the vertical cross section when the central portion of the pressing surface facing the second surface contacts the central portion of the second surface in the valve closed state. And is gradually curved away from the second surface to form a curved surface. In this vibration detection valve , the second moving body also moves when it is subjected to the horizontal vibration, so that the first moving body becomes easier to move. Therefore, the vibration detecting valve can be opened and closed with high responsiveness even with a small vibration.

In the vibration detecting valve of the first invention, the first surface, the receiving surface, the second surface, and the pressing surface may be spherical. The curvature of the first surface is larger than that of the receiving surface, and the curvature of the second surface is larger than that of the pressing surface. In this case, the vibration detection valve can smoothly open and close the first moving body, and can open and close with good responsiveness even with a small vibration.

In the vibration detecting valve according to the first aspect of the present invention, the first moving body may have the first flow path formed therein. The first flow passage penetrates the first moving body closer to the outer edge portion than the central portion, and has one end opened to the first surface and the other end opened to the second surface. In this case, since the working fluid flows through the first flow path, the working fluid flowing into the internal space from the inflow port can smoothly flow toward the outflow port.

In the vibration detecting valve according to the first aspect of the present invention, the second moving body may have a second flow passage formed in a central portion thereof. In this case, since the working fluid flows through the second flow path, the working fluid flowing into the internal space from the inflow port can smoothly flow toward the outflow port.
The vibration detection valve of the first invention may include a plurality of second elastic bodies. The second elastic body is provided between the outer peripheral surface of the second moving body and the inner side surface of the housing, and applies an elastic force so as to return to the original position when the second moving body moves in the horizontal direction. ..
The vibration detecting valve of the second invention comprises a housing, a first moving body, and an elastic body. The housing has an internal space, an inflow port, and an outflow port. The internal space has a receiving surface. The inflow port communicates with the internal space. The outflow port communicates with an outflow port opened at the center of the receiving surface. The first moving body is movably accommodated in the internal space so as to open and close the outlet. The first moving body is opposed to the receiving surface, and when the central portion is positioned in the closed state in which the outlet is closed, the first moving body is curved so as to gradually separate from the central surface toward the outer edge portion in the vertical cross section. It has a first surface that bulges into a planar shape. The elastic body applies an elastic force in a direction in which the first moving body is pressed against the receiving surface. The first moving body has a first flow path that penetrates from the central portion to the outer edge side and has one end opening to the first surface and the other end opening to the second surface.
The vibration detection valve of the third invention comprises a housing, a moving body, a first elastic body and a second elastic body. The housing has an internal space, an inflow port, and an outflow port. The internal space has a receiving surface. The inflow port communicates with the internal space. The outflow port communicates with an outflow port opened at the center of the receiving surface. The movable body is movably accommodated in the internal space so as to open and close the outlet. The moving body has a curved surface shape facing the receiving surface and gradually moving away from the receiving surface from the central portion toward the outer edge portion in the vertical cross section when the central portion is in the closed state with the outlet closed. It has a bulged surface. The first elastic body is provided between the upper end of the moving body and the ceiling surface of the housing, and applies an elastic force in a direction of pressing the moving body against the receiving surface. The second elastic body is provided between a plurality of locations on the same circumference at the upper and lower central portions of the moving body and the inner side surface of the housing, and returns to the original position when the moving body moves in the horizontal direction. It gives elasticity.

The damper of the fourth invention comprises a cylinder tube, a piston, a rod, a first communication passage, a second communication passage, a third communication passage, and a lock mechanism. The piston is slidably housed in the cylinder tube. The piston divides the inside of the cylinder tube into a rod side chamber and a piston side chamber. The rod has a tip portion connected to a piston and is reciprocally inserted into a cylinder tube. The first communication passage communicates the piston side chamber and the rod side chamber. The second communication passage connects the rod side chamber and the reservoir tank. The third communication passage communicates the reservoir tank with the piston side chamber. The lock mechanism is provided in the middle of the second communication passage or the third communication passage. The lock mechanism has a vibration detection valve and a lock valve. The lock valve is opened and closed by opening and closing the vibration detection valve.

In this damper, the lock valve is opened/closed by opening/closing the vibration detection valve, thereby connecting or blocking the second communication passage or the third communication passage. That is, by opening/closing the vibration detection valve and the lock valve, it is possible to switch between the unlocked state in which the damper is allowed to expand and contract, and the locked state in which the damper is not expanded and contracted. Therefore, the damper can switch between the unlocked state and the locked state with good responsiveness even with a small vibration.

It is a schematic diagram showing the state where the damper of Embodiment 1 was used for the vibration isolation device. 3 is a fluid pressure circuit diagram of the damper of Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing a closed state of the vibration detection valve of the first embodiment. FIG. 3 is a cross-sectional view showing an open state of the vibration detection valve of the first embodiment.

A first embodiment in which a damper including a vibration detection valve according to the present invention is embodied will be described with reference to the drawings.

<Embodiment 1>
The damper 10 according to the first embodiment can be used for a vibration isolation device, as shown in FIG. This vibration isolation device includes a damper 10 and a vibration isolation support B including a laminated rubber column. The damper 10 is arranged between the building A and the ground G. The base isolation support B is disposed between the building A and the ground G, and functions to prevent the rolling of the ground G from propagating to the building A when the ground G rolls due to an earthquake.

As shown in FIG. 2, the damper 10 includes a cylinder tube 11, a piston 13, a rod 15, an outer cylinder 17, a first communication passage 21, a first check valve 21A, a second communication passage 22, a damping valve 30, and a lock mechanism. 40, the third communication passage 23, and the second check valve 23A. The piston 13 is slidably housed in the cylinder tube 11. The piston 13 partitions the inside of the cylinder tube 11 into a rod side chamber R1 and a piston side chamber R2. The rod-side chamber R1 and the piston-side chamber R2 are filled with working oil that is working fluid.

The rod 15 has a tip end coupled to the piston 13, and is inserted into the cylinder tube 11 with the other end protruding outward from one end of the cylinder tube 11. The rod 15 is reciprocally movable. The outer cylinder 17 is arranged outside the cylinder tube 11 coaxially with the cylinder tube 11. The space provided between the cylinder tube 11 and the outer cylinder 17 stores hydraulic oil and is used as a reservoir tank R3.

The first communication passage 21 penetrates the piston 13 and connects the piston side chamber R2 and the rod side chamber R1. The first check valve 21A is provided in the middle of the first communication passage 21. The first check valve 21A allows the hydraulic oil to flow from the piston side chamber R2 to the rod side chamber R1 and blocks the reverse flow.

The second communication passage 22 connects the rod side chamber R1 and the reservoir tank R3. The damping valve 30 is provided in the middle of the second communication passage 22. The damping valve 30 is a damping force variable valve that changes the flow passage area by using the hydraulic pressure on the upstream side of the second communication passage 22 as a pilot pressure. The damping valve 30 is set to increase the flow passage area as the hydraulic pressure increases.

The lock mechanism 40 is provided in the middle of the second communication passage 22 and on the downstream side of the damping valve 30. The lock mechanism 40 includes a lock valve 50 and a vibration detection valve 60. The lock valve 50 maintains a closed state when a vibration detection valve 60, which will be described later, provided in the middle of the pilot line 55 is closed, and opens when the vibration detection valve 60 opens. That is, the lock valve 50 is a pilot-type on-off valve, and the vibration detection valve 60 functions as a pilot valve.

As shown in FIGS. 3 and 4, the vibration detection valve 60 includes a housing 61, a first moving body 70, a second moving body 80, and an elastic body 90. The housing 61 has an upper housing 61A and a lower housing 61B. The upper housing 61A and the lower housing 61B are located above and below each other and are combined. The upper housing 61A has a circular horizontal cross section, and has an upper recess 62A that opens downward. The lower housing 61B has a circular horizontal cross section, and has a lower recess 62B that opens upward. The inner diameter of the upper recess 62A in the horizontal cross section is the same as the inner diameter of the lower recess 62B in the horizontal cross section. The upper housing 61A and the lower housing 61B are combined with the spigot so that the upper recess 62A and the lower recess 62B are located coaxially extending in the vertical direction. Then, the upper concave portion 62A and the lower concave portion 62B are connected to each other, and the inner space S is formed by the upper concave portion 62A and the lower concave portion 62B.

The ceiling surface 63 of the upper recess 62A of the upper housing 61A is a flat surface that extends on a horizontal plane. The upper housing 61A is formed with an inflow port 64 penetrating in the vertical direction at the center thereof. On the other hand, the lower housing 61B has a receiving surface 66 which has a circular horizontal cross section and a vertical cross section which is formed into a symmetrical curved surface at the center of the bottom surface 65 of the lower recess 62B. The receiving surface 66 is a recess having a constant curvature. That is, the receiving surface 66 has a spherical shape. Further, the receiving surface 66 has an outlet 67 opening in the center. The bottom surface 65 of the lower recess 62B around the receiving surface 66 is a flat surface that extends on a horizontal plane. The lower housing 61B has an outlet port 68 formed in the center thereof so as to communicate with the outlet 67 and penetrate vertically. The inflow port 64 and the outflow port 68 are formed to extend coaxially.

The first moving body 70 is sandwiched between a receiving surface 66 and a pressing surface 83 of a second moving body 80, which will be described later, movably stored in the internal space S, and the first moving body 70 is movably stored in the internal space S. Has been done. The elastic force of the elastic body 90 described later is applied to the first moving body 70 in a direction in which the first moving body 70 is pressed against the receiving surface 66 via the second moving body 80 described later. The first moving body 70 has a circular horizontal cross section. Further, the first moving body 70, in a state of being housed in the internal space S, is a first surface 71 facing the receiving surface 66 and a surface opposite to the first surface 71 and facing the pressing surface 83. The second surface 72 is bulged in a curved surface shape that is symmetrical in the vertical cross section. The first surface 71 and the second surface 72 have a spherical shape with a constant curvature and have the same curvature. The curvatures of the first surface 71 and the second surface 72 are larger than the curvature of the receiving surface 66. Therefore, when the central portion of the first moving body 70 is in the valve closed state in which the outlet portion 67 of the receiving surface 66 is closed, the first surface 71 gradually has the first surface 71 from the central portion toward the outer peripheral edge portion in the vertical cross section. It is away from the receiving surface 66. The first moving body 70 has an outer peripheral surface 73 whose outer peripheral edge portion rises in the vertical direction. That is, the first moving body 70 has a convex lens shape with the outer peripheral edge portion cut off. The first moving body 70 is formed with a plurality of first flow paths 74 penetrating from the central portion to the outer peripheral edge side. Each of the first flow paths 74 has one end opening to the first surface 71 and the other end opening to the second surface 72.

The second moving body 80 is movably housed in the internal space S. The second moving body 80 has a circular outer shape in a horizontal cross section in a state of being housed in the internal space S. The second moving body 80 has an outer diameter smaller than the inner diameter of the upper recess 62A formed in the upper housing 61A and the lower recess 62B formed in the lower housing 61B. The upper surface 81 of the second moving body 80 is a flat surface that extends on a horizontal plane. In addition, the second moving body 80 has a pressing surface 83 having a circular horizontal cross section and a vertical cross section that is symmetrically concavely formed in a curved surface shape in the central portion of the lower surface 82. The pressing surface 83 has a spherical shape with a constant curvature, and is a recess having the same curvature as the curvature of the receiving surface 66. Therefore, the second moving body 80 is housed in the internal space S, and the pressing surface facing the second surface 72 of the first moving body 70 in the valve closed state in which the first moving body 70 is positioned in the valve closed state. When the central portion of 83 comes into contact with the central portion of the second surface 72, it is recessed in a curved surface shape in the vertical section so that it gradually separates from the central portion of the pressing surface 83 toward the outer edge portion from the second surface 72. I'm out. The lower surface 82 of the second moving body 80 around the pressing surface 83 is formed as a flat surface extending on a horizontal plane. The second moving body 80 has a second flow path 84 formed in the center thereof so as to penetrate therethrough in the vertical direction. The elastic force of an elastic body 90 described later is applied to the second moving body 80 in a direction in which the first moving body 70 sandwiched between the second moving body 80 and the receiving surface 66 is pressed against the receiving surface 66.

The elastic body 90 is made of rubber and has a cylindrical shape. The upper housing 61A is provided with an annular insertion recess 69 into which the upper portion of the elastic body 90 is inserted around the inflow port 64 formed in the central portion. The elastic body 90 is fixed by inserting an upper portion thereof into an insertion recess 69 formed in the upper housing 61A. The lower end of the elastic body 90 is in contact with the upper surface 81 of the second moving body 80, and applies an elastic force in a direction of moving the second moving body 80 downward. That is, the elastic body 90 applies an elastic force in the direction in which the first moving body 70 sandwiched between the second moving body 80 and the receiving surface 66 is pressed against the receiving surface 66 via the second moving body 80. .. The elastic body 90 does not contact the upper surface of the second moving body 80 in a liquid-tight manner and does not block the flow of hydraulic oil.

As shown in FIGS. 3 and 4, the vibration detection valve 60 is filled with hydraulic oil in a gap in the internal space S in which the first moving body 70 and the second moving body 80 are housed. In the vibration detection valve 60, when no vibration is input, the first moving body 70 and the second moving body 80 are located in the horizontal center of the internal space S of the housing 61, and the elastic body 90 is the first moving body. Since the elastic force is applied to the receiving surface 70 in the direction of pressing the receiving surface 66, the central portion of the first surface 71 of the first moving body 70 closes the outflow port 67 and closes the valve. That is, there is no movement of the hydraulic oil in the vibration detection valve 60, no hydraulic oil flows into the internal space S from the inflow port 64, and no hydraulic oil flows out from the outflow port 68.

When vibration with a large horizontal acceleration (for example, vibration generated during an earthquake) is input to the vibration detection valve 60, the first moving body 70 and the second moving body 80 move horizontally, When a vibration having a small directional acceleration (for example, a vibration generated when the building A is shaken by a strong wind) is input, the first moving body 70 and the second moving body 80 are prevented from moving so that the first moving body 70 and the second moving body 80 do not move. The mass of the second moving body 80, the elastic force of the elastic body 90, and the like are set.

Thus, when the vibration detection valve 60 receives a vibration having a large horizontal acceleration, the first moving body 70 does not move by sliding on the receiving surface 66, but moves by rolling to move the first moving body 70. The outflow port 67, which was closed by the moving body 70, is opened and the valve is opened. As a result, hydraulic oil flows into the internal space S from the inflow port 64, and hydraulic oil flows out from the outflow port 68. At this time, the hydraulic oil also passes through the first flow path 74 formed in the first moving body 70 and the second flow path 84 formed in the second moving body 80.

As shown in FIG. 2, the third communication passage 23 connects the reservoir tank R3 and the piston side chamber R2. The second check valve 23A is provided in the middle of the third communication passage 23. The second check valve 23A allows the working oil to flow from the reservoir tank R3 to the piston side chamber R2, and blocks the reverse flow.

In the damper 10 having such a configuration, the flow of the hydraulic oil from the rod side chamber R1 to the reservoir tank R3 is blocked when the vibration detection valve 60 and the lock valve 50 are closed and the second communication passage 22 is blocked. As a result, it is locked so that it cannot expand and contract. Further, in the damper 10, when the vibration detection valve 60 and the lock valve 50 are opened and the second communication passage 22 is in communication, the flow of the hydraulic oil from the rod side chamber R1 to the reservoir tank R3 is allowed. It is in an unlocked state where it can expand and contract.

As shown in FIG. 1, when the damper 10 is used in a vibration isolation device, when vibration with a large horizontal acceleration due to an earthquake shake is input to the vibration detection valve 60, the vibration detection valve 60 opens. Then, the lock valve 50 is opened and the unlocked state is established. As a result, the damper 10 expands and contracts with the vibration of the earthquake, and the damping force generated at that time can quickly suppress the rolling of the building A. On the other hand, in the damper 10, when the building A is shaken by a strong wind, the vibration input to the vibration detection valve 60 is a vibration with a small horizontal acceleration, so the vibration detection valve 60 and the lock valve 50 are closed. There is a lock, and the locked state is maintained. For this reason, expansion and contraction of the damper 10 is prevented, and shaking of the building A due to strong wind can be prevented.

<Embodiment 2>
In the vibration detection valve 160 of the second embodiment, as shown in FIG. 5, the entire bottom surface of the lower housing 161B is a flat surface that spreads on a horizontal plane, and a plurality of first flow paths are formed in the first moving body 170. Not having a second elastic body 192 for returning to the original position when the second moving body 180 moves in the left-right direction, and the second flow path is formed in the second moving body 180. The difference is that it is not. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The vibration detection valve 160 includes a housing 161, a first moving body 170, a second moving body 180, a first elastic body 191, and a second elastic body 192. The housing 161 has an upper housing 161A and a lower housing 161B. The upper housing 161A and the lower housing 161B are located above and below each other and are combined. The upper housing 161A has a circular horizontal cross section, and has an upper recess 162A opening downward. The lower housing 161B has a circular horizontal cross section, and has a lower recess 162B that opens upward. The inner diameter of the upper recess 162A in the horizontal cross section is the same as the inner diameter of the lower recess 162B in the horizontal cross section. The upper housing 161A and the lower housing 161B are combined with the spigot so that the upper recess 162A and the lower recess 162B are positioned coaxially extending in the vertical direction. Then, the upper recess 162A and the lower recess 162B are connected to each other, and the inner space S is formed by the upper recess 162A and the lower recess 162B.

The ceiling surface 163 of the upper recess 162A of the upper housing 161A is a flat surface that extends on a horizontal plane. The upper housing 161A is formed with an inflow port 164 penetrating in the vertical direction at the center thereof. On the other hand, the lower housing 161B is a plane in which the entire bottom surface 165 extends on a horizontal plane. The bottom surface 165 of the lower housing 161</b>B constitutes the receiving surface 166, and the outlet 167 is opened at the center of the receiving surface 166. The lower housing 161B has an outflow port 168 that communicates with the outflow port 167 and penetrates vertically in the central portion. The inflow port 164 and the outflow port 168 are formed to extend coaxially.

The first moving body 170 is sandwiched between the receiving surface 166 and the pressing surface 183 of the second moving body 180 movably accommodated in the internal space S and is movably accommodated in the internal space S. There is. The elastic force of the first elastic body 191 is applied to the first moving body 170 in a direction in which it is pressed against the receiving surface 166 via the second moving body 180. The first moving body 170 has a circular horizontal cross section. Further, the first moving body 170 is accommodated in the internal space S and is a first surface 171 facing the receiving surface 166 and a surface opposite to the first surface 171 and facing the pressing surface 183. The second surface 172 that is formed bulges into a curved surface shape that is symmetrical in the vertical cross section. The first surface 171 and the second surface 172 have a spherical shape with a constant curvature and have the same curvature. In the first moving body 170, when the central portion is located in the valve closed state in which the outlet 167 of the receiving surface 166 is closed, the first surface 171 gradually extends from the central portion toward the outer peripheral edge in the vertical cross section. It is far from 166. The first moving body 170 has an outer peripheral surface 173 whose outer peripheral edge portion stands up in the vertical direction. That is, the first moving body 170 has a convex lens shape with the outer peripheral edge portion cut off.

The second moving body 180 is movably housed in the internal space S. The second moving body 180 has a circular outer shape in a horizontal cross section in a state of being stored in the internal space S. The second moving body 180 has an outer diameter smaller than the inner diameter of the upper recess 162A formed in the upper housing 161A and the lower recess 162B formed in the lower housing 161B. The second moving body 180 is a plane in which the upper surface 181 spreads on a horizontal plane. Further, the second moving body 180 has a pressing surface 183 having a circular horizontal cross section and a vertical cross section which is symmetrically recessed in a curved surface shape at the center of the lower surface 182. The pressing surface 183 has a spherical shape with a constant curvature. The curvature of the second surface 172 of the first moving body 170 is larger than the curvature of the pressing surface 183. Therefore, the second moving body 180 is housed in the internal space S, and the pressing surface facing the second surface 172 of the first moving body 170 in the valve closed state in which the first moving body 170 is positioned in the valve closed state. When the central part of 183 abuts the central part of the second surface 172, it is recessed in a curved surface shape in the vertical section so as to gradually separate from the central part of the pressing surface 183 toward the outer edge part from the second surface 172. I'm out. The second moving body 180 is formed such that the lower surface 182 around the pressing surface 183 is a flat surface spreading on a horizontal plane. The elastic force of the first elastic body 191 is applied to the second moving body 180 in a direction in which the first moving body 170 sandwiched between the second moving body 180 and the receiving surface 166 is pressed against the receiving surface 166.

The first elastic body 191 is a compression coil spring, and a plurality of the first elastic body 191 are provided between the upper surface 181 of the second moving body 180 and the ceiling surface 163 of the upper housing 161A. The first elastic body 191 applies an elastic force in a direction of moving the second moving body 180 downward. That is, the first elastic body 191 exerts an elastic force on the receiving surface 166 by pressing the first moving body 170 sandwiched between the second moving body 180 and the receiving surface 166 via the second moving body 180. Give.

The second elastic body 192 is a tension coil spring, and a plurality of the second elastic body 192 is provided between the outer peripheral surface 184 of the second moving body 180 and the inner side surface of the upper housing 161A. The second elastic body 192 pulls the second moving body 180 in the horizontal direction, and when the second moving body 180 moves in the horizontal direction, the second elastic body 192 exerts an elastic force to return the elastic force to the original position. Have been given to.

This vibration detection valve 160 is filled with hydraulic oil in a gap in the internal space S in which the first moving body 170 and the second moving body 180 are housed. In the vibration detection valve 160, when no vibration is input, the first moving body 170 and the second moving body 180 are located in the horizontal central portion of the internal space S of the housing 161, and the first elastic body 191 is the first. Since the elastic force is applied in the direction in which the moving body 170 is pressed against the receiving surface 166, the central portion of the first surface 171 of the first moving body 170 closes the outflow port 167 and closes the valve. That is, there is no movement of the hydraulic oil in the vibration detection valve 160, no inflow of the hydraulic oil from the inflow port 164 into the internal space S, and no outflow of the hydraulic oil from the outflow port 168.

In the vibration detection valve 160, the first moving body 170 and the second moving body 180 move in the horizontal direction when a vibration with a large horizontal acceleration (for example, a vibration generated in an earthquake) is input, When a vibration with a small directional acceleration (for example, a vibration generated when the building A is shaken by a strong wind) is input, the first moving body 170 and the second moving body 180 are prevented from moving so that the first moving body 170 and the second moving body 180 do not move. The mass of the second moving body 180, the elastic force of the first elastic body 191, and the elastic force of the second elastic body 192 are set.

As described above, when the vibration detection valve 160 receives a vibration with a large horizontal acceleration, the first moving body 170 does not move by sliding on the receiving surface 166 but moves by rolling to move the first moving body 170. The outlet 167, which was closed by the moving body 170, is opened to open the valve. As a result, hydraulic oil flows into the internal space S from the inflow port 164, and hydraulic oil flows out from the outflow port 168.

<Embodiment 3>
As shown in FIG. 6, the vibration detection valve 260 of the third embodiment is different from the second embodiment in that the first moving body 270 is a spherical body and the second moving body is not provided. The same configurations as those in Embodiments 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

The vibration detection valve 260 includes a housing 261, a first moving body 270, a first elastic body 291, and a second elastic body 292. The housing 261 has an upper housing 261A and a lower housing 261B. The upper housing 261A and the lower housing 261B are located above and below each other and are combined. The upper housing 261A has a circular horizontal cross section, and has an upper recess 262A that opens downward. The lower housing 261B has a circular horizontal cross section, and has a lower recess 262B that opens upward. The inner diameter of the upper recess 262A in the horizontal cross section is the same as the inner diameter of the lower recess 262B in the horizontal cross section. The upper housing 261A and the lower housing 261B are combined with the spigot so that the upper recess 262A and the lower recess 262B are located coaxially extending in the vertical direction. Then, the upper recess 262A and the lower recess 262B are connected to each other, and the upper recess 262A and the lower recess 262B form an internal space S.

The ceiling surface 263 of the upper recess 262A of the upper housing 261A is a flat surface that extends on a horizontal plane. The upper housing 261A is formed with an inflow port 264 penetrating in the vertical direction. On the other hand, the lower housing 261B is a plane in which the entire bottom surface 265 spreads on a horizontal plane. The bottom surface 265 of the lower housing 261B constitutes a receiving surface 266, and an outlet 267 is opened at the center of the receiving surface 266. The lower housing 261B has an outflow port 268 that communicates with the outflow port 267 in the central portion and penetrates vertically.

The first moving body 270 is a sphere. Therefore, the lower outer peripheral surface of the first moving body 270 corresponds to the first surface 271. The first moving body 270 is movably accommodated in the internal space S. The elastic force of the first elastic body 291 is applied to the first moving body 270 in the direction to be pressed by the receiving surface 266. When the central portion of the first surface 271 is positioned in the valve closed state in which the outlet portion 267 of the receiving surface 266 is closed, the first moving body 270 is directed from the central portion of the first surface 271 toward the outer peripheral edge portion in the vertical cross section. The first surface 271 is gradually separated from the receiving surface 166.

The first elastic body 291 is a compression coil spring, and is provided between the upper end of the first moving body 270 and the ceiling surface 263 of the upper housing 261A. The first elastic body 291 applies an elastic force in a direction of pressing the first moving body 270 against the receiving surface 266.

The second elastic bodies 292 are tension coil springs, and a plurality of second elastic bodies 292 are provided between a plurality of locations on the same circumference of the upper and lower central portions of the first moving body 270 and the inner surface of the upper housing 261A. The second elastic body 292 pulls the first moving body 270 in the horizontal direction, and when the first moving body 270 moves in the horizontal direction, the second elastic body 292 exerts an elastic force on the first moving body 270 so as to return to the original position. Have been given to.

The vibration detection valve 260 is filled with hydraulic oil in the gap of the internal space S in which the first moving body 270 is housed. In the vibration detection valve 260, when no vibration is input, the first moving body 270 is located in the horizontal center of the internal space S of the housing 261, and the first elastic body 291 receives the first moving body 270. Since the elastic force is applied in the direction of pressing the 266, the central portion of the first surface 271 of the first moving body 270 closes the outflow port 267 and is in a valve closed state. That is, there is no movement of the hydraulic oil in the vibration detection valve 260, no inflow of the hydraulic oil from the inflow port 264 to the internal space S, and no outflow of the hydraulic oil from the outflow port 268.

When vibration with a large horizontal acceleration (for example, vibration that occurs during an earthquake) is input to the vibration detection valve 260, the first moving body 270 moves in the horizontal direction, but the horizontal acceleration is small. When the vibration (for example, the vibration generated when the building A shakes due to a strong wind) is input, the mass of the first moving body 270 and the first elastic body 291 and the second elastic body are controlled so that the first moving body 270 does not move. The elastic force or the like of 292 is set.

As described above, when the vibration detection valve 260 receives an input of vibration having a large horizontal acceleration, the first moving body 270 does not move by sliding on the receiving surface 266, but moves by rolling to move the first moving body 270. The outflow port 267, which was closed by the moving body 270, is opened to open the valve. As a result, hydraulic oil flows into the internal space S from the inflow port 264, and hydraulic oil flows out from the outflow port 268.

The vibration detection valves 60, 160, 260 of the first to third embodiments include housings 61, 161, 261, first moving bodies 70, 170, 270, and elastic bodies 90, 191, 291. The housings 61, 161, 261 are formed with an internal space S, inflow ports 64, 164, 264, and outflow ports 68, 168, 268. The internal space S has receiving surfaces 66, 166, 266. The inflow ports 64, 164, 264 communicate with the internal space S. The outflow ports 68, 168, 268 communicate with the outflow ports 67, 167, 267 opened in the center of the receiving surfaces 66, 166, 266. The first moving bodies 70, 170, 270 are movably accommodated in the internal space S so as to open and close the outlets 67, 167, 267. The first moving bodies 70, 170, 270 have first surfaces 71, 171, 271, which are opposed to the receiving surfaces 66, 166, 266 and swell in a spherical shape. The first surfaces 71, 171, 271, when the central portion is located in the closed state in which the outlets 67, 167, 267 are closed, in the vertical cross section, gradually receive the receiving surface 66 from the central portion toward the outer edge portion, Leave 166,266. The elastic bodies 90, 191, 291 apply elastic force in the direction of pressing the first moving bodies 70, 170, 270 against the receiving surfaces 66, 166, 266.

In the vibration detection valves 60, 160, 260, the first moving bodies 70, 170, 270 pressed against the receiving surfaces 66, 166, 266 by the elastic bodies 90, 191, 291 close the outlets 67, 167, 267. When the valve is in the closed state, in the vertical cross section, the spherical shape bulges away from the receiving surface 66, 166, 266 gradually from the central portion toward the outer edge portion. Therefore, when the vibration detection valves 60, 160, 260 are subjected to lateral vibration, the first moving bodies 70, 170, 270 move so as to roll, and the outlets 67, 167, 267 open and open. It becomes a state. As described above, the vibration detection valves 60, 160, 260 do not move by sliding the first moving bodies 70, 170, 270 on the receiving surfaces 66, 166, 266, but move by rolling. Is small. Therefore, the vibration detection valves 60, 160, 260 can be opened and closed with good response even with a small vibration.

Therefore, the vibration detection valves 60, 160, 260 do not require electric power and can be opened and closed satisfactorily with only a vibration input with a simple structure.

In the vibration detection valve 60 of the first embodiment, the receiving surface 66 is recessed into a spherical shape in the vertical cross section. Therefore, the vibration detection valve 60 can stably open and close because the movement range of the first moving body 70 is restricted by the receiving surface 66.

The vibration detection valves 60 and 160 of the first and second embodiments include second moving bodies 80 and 180. In the first moving bodies 70 and 170, the second surfaces 72 and 172 on the opposite side of the first surfaces 71 and 171 swell into a spherical shape. The second moving bodies 80 and 180 are movably accommodated in the internal space S. Further, the second moving bodies 80, 180 sandwich the first moving bodies 70, 170 with the receiving surfaces 66, 166 and press the first moving bodies 70, 170 against the receiving surfaces 66, 166 in the elastic body 90. , 191 elastic forces are applied. In addition, the second moving bodies 80, 180 are pressed when the central portions of the pressing surfaces 83, 183 facing the second surfaces 72, 172 come into contact with the central portions of the second surfaces 72, 172 in the valve closed state. The surface 83, 183 is recessed in a spherical shape so as to gradually separate from the second surface 72, 172 from the central portion toward the outer edge. The second moving bodies 80 and 180 also move when they are subjected to left-right vibration, so that the first moving bodies 70 and 170 become easier to move. Therefore, the vibration detection valves 60 and 160 can be opened and closed with high responsiveness even with a small vibration.

In the vibration detection valve 60 of the first embodiment, the first surface 71, the receiving surface 66, the second surface 72, and the pressing surface 83 have a spherical shape. The curvature of the first surface 71 is larger than that of the receiving surface 66, and the curvature of the second surface 72 is larger than that of the pressing surface 83. Therefore, the vibration detection valve 60 can smoothly open and close the first moving body 70, and can open and close with better responsiveness even with a small vibration.

In the vibration detection valve 60 of the first embodiment, the first flow path 74 is formed in the first moving body 70. The first flow path 74 penetrates on the outer edge side of the first moving body 70 with respect to the central part, and has one end opening to the first surface 71 and the other end opening to the second surface 72. Since the hydraulic oil flows through the first flow path 74, the hydraulic oil flowing into the internal space S from the inflow port 64 can smoothly flow toward the outflow port 67.

In the vibration detection valve 60 of the first embodiment, the second moving body 80 has the second flow passage 84 formed at the center thereof. Since the hydraulic oil flows through the second flow path 84, the hydraulic oil that has flowed into the internal space S from the inflow port 64 can smoothly flow toward the outflow port 67.

The damper 10 includes a cylinder tube 11, a piston 13, a rod 15, a first communication passage 21, a second communication passage 22, a third communication passage 23, and a lock valve 50. The piston 13 is slidably housed in the cylinder tube 11. The piston 13 partitions the inside of the cylinder tube 11 into a rod side chamber R1 and a piston side chamber R2. The rod 15 is inserted into the cylinder tube 11 such that its tip portion is connected to the piston 13 and can reciprocate. The first communication passage 21 connects the piston side chamber R2 and the rod side chamber R1. The second communication passage 22 connects the rod side chamber R1 and the reservoir tank R3. The third communication passage 23 connects the reservoir tank R3 and the piston side chamber R2. The lock mechanism 40 is provided in the middle of the second communication passage 22. The lock mechanism 40 has vibration detection valves 60, 160, 260 and a lock valve 50. The lock valve 50 is opened/closed by opening/closing the vibration detection valves 60, 160, 260.

In this damper 10, the lock valve 50 is opened/closed by opening/closing the vibration detection valves 60, 160, 260 to connect or disconnect the second communication passage 22. That is, by opening/closing the vibration detection valves 60, 160, 260 and the lock valve 50, it is possible to switch between the unlocked state in which the damper 10 can be expanded and contracted or the locked state in which the damper is not expanded and contracted. Therefore, the damper 10 can switch between the unlocked state and the locked state with good responsiveness even with a small vibration.

The present invention is not limited to the first to third embodiments described by the above description and the drawings, and the following embodiments are also included in the technical scope of the present invention.
(1) In the first and second embodiments, the first moving body of the vibration detection valve has a convex lens shape with a peripheral edge cut off, but it has a spindle shape, or the first surface extends in at least one horizontal direction. It may have a shape that bulges into a symmetrical curved surface shape in the vertical cross section.
(2) In the first and second embodiments, the first surface and the second surface of the first moving body of the vibration detection valve are spherical surfaces having a constant curvature, but the curvature of the peripheral portion is larger than the curvature of the central portion. It may be a curved surface that gradually changes so that
(3) In the first and second embodiments, the first surface and the second surface of the first moving body of the vibration detection valve are spherical surfaces having the same curvature, but the curvature of the first surface and the curvature of the second surface are different. May be different.
(4) In the first and second embodiments, the vibration detection valve has the second moving body, but it does not have to have the second moving body. In this case, the second surface of the first moving body may be a flat surface, the elastic body may be brought into direct contact with the second surface, and an elastic force may be applied in a direction in which the first moving body is pressed against the receiving surface.
(5) In the first embodiment, the elastic body of the vibration detection valve is made of rubber, but an elastic body such as a coil spring may be used.
(6) In the first to third embodiments, the vibration detection valve is arranged such that the upper casing is on the upper side and the lower casing is on the lower side, but it may be inverted upside down and used.
(7) In the first to third embodiments, the space provided between the cylinder tube of the damper and the outer cylinder is used as the reservoir tank, but the reservoir tank may be separately provided without providing the outer cylinder.
(8) In Embodiments 1 to 3, the lock mechanism is provided in the middle of the second communication passage of the damper, but the lock mechanism may be provided not in the second communication passage but in the third communication passage.
(9) In Embodiments 1 to 3, hydraulic oil is used, but other fluids may be used.
(10) In Embodiments 2 and 3, the second elastic body is a tension coil spring, but the second elastic body may be a compression coil spring.

10... Damper, 11... Cylinder tube, 13... Piston, 15... Rod, 21... 1st communicating passage, 22... 2nd communicating passage, 23... 3rd communicating passage, 40... Lock mechanism, 50... Lock valve, 60, 160, 260... Vibration detection valve, 61, 161, 261... Housing, 64, 164, 264... Inflow port, 66, 166, 266... Receiving surface, 67, 167, 267... Outflow port, 68, 168, 268... Outflow Ports, 70, 170, 270... First moving body, 71, 171, 271... First surface, 72, 172... Second surface, 74... First flow path, 80, 180... Second moving body, 83, 183 ... Pressing surface, 84... Second flow path, 90, 191, 291... Elastic body (191, 291... First elastic body), R1... Rod side chamber, R2... Piston side chamber, R3... Reservoir tank, S... Internal space

Claims (8)

A housing having an internal space having a receiving surface, an inflow port communicating with the internal space, and an outflow port communicating with an outflow port opening at the center of the receiving surface;
It is movably accommodated in the internal space so as to open and close the outlet, faces the receiving surface, and when the central portion is in a closed valve state in which the outlet is closed, in a vertical cross section, A first moving body having a first surface swelling in a curved surface shape so as to gradually separate from the receiving surface from the central portion toward the outer edge portion;
An elastic body that applies an elastic force in a direction in which the first moving body is pressed against the receiving surface;
Equipped with
In the vertical cross section in the valve closed state, the second surface of the first moving body opposite to the first surface swells into a curved surface shape,
The elastic body is movably accommodated in the internal space, and the elastic force of the elastic body is applied in a direction in which the first moving body is sandwiched between the receiving surface and the first moving body and is pressed against the receiving surface. When the central portion of the pressing surface facing the second surface in the valve closed state abuts the central portion of the second surface, the central portion of the pressing surface gradually increases from the central portion of the pressing surface toward the outer edge portion in the vertical cross section. And a second moving body that is recessed in a curved surface shape away from the second surface . The vibration detecting valve according to claim 1, wherein the receiving surface is recessed in a curved surface shape in a vertical cross section. The first surface, the receiving surface, the second surface, and the pressing surface are spherical shapes, the curvature of the first surface is larger than the curvature of the receiving surface, and the curvature of the second surface is the pressing surface. The vibration detecting valve according to claim 1 or 2, wherein the vibration detecting valve has a curvature larger than the curvature . A housing having an internal space having a receiving surface, an inflow port communicating with the internal space, and an outflow port communicating with an outflow port opening at the center of the receiving surface;
It is movably accommodated in the internal space so as to open and close the outlet, faces the receiving surface, and when the central portion is in a closed valve state in which the outlet is closed, in a vertical cross section, A first moving body having a first surface swelling in a curved surface shape so as to gradually separate from the receiving surface from the central portion toward the outer edge portion;
An elastic body that applies an elastic force in a direction in which the first moving body is pressed against the receiving surface;
Equipped with
The first moving body has a first flow path that penetrates from the central portion to the outer edge side and has one end opened to the first surface and the other end opened to the second surface opposite to the first surface. Vibration detection valve characterized by being The vibration detecting valve according to any one of claims 1 to 3 , wherein the second moving body has a second flow passage formed in a central portion thereof. A plurality of first moving bodies which are provided between the outer peripheral surface of the second moving body and the inner side surface of the housing and which provide elastic force to return the second moving body to the original position when the second moving body moves in the horizontal direction. The vibration detection valve according to claim 1, comprising two elastic bodies . A housing having an internal space having a receiving surface, an inflow port communicating with the internal space, and an outflow port communicating with an outflow port opening at the center of the receiving surface;
It is movably accommodated in the internal space so as to open and close the outlet, faces the receiving surface, and when the central portion is in a closed valve state in which the outlet is closed, in a vertical cross section, A moving body having a curved surface swelling gradually away from the receiving surface from the central portion toward the outer edge portion,
A first elastic body which is provided between an upper end portion of the moving body and a ceiling surface of the housing, and which applies an elastic force in a direction of pressing the moving body against the receiving surface;
The moving body is provided between a plurality of locations on the same circumference in the upper and lower central portions and the inner surface of the housing, and an elastic force is applied to return the moving body to the original position when the moving body moves in the horizontal direction. A vibration detecting valve comprising: a plurality of second elastic bodies to be applied. A cylinder tube,
A piston that is slidably accommodated in the cylinder tube and partitions the inside of the cylinder tube into a rod side chamber and a piston side chamber,
A rod inserted into the cylinder tube so that the piston is reciprocally movable by connecting the tip portion to the piston;
A first communication passage that connects the piston-side chamber and the rod-side chamber,
A second communication passage that connects the rod-side chamber and the reservoir tank;
A third communication passage that connects the reservoir tank and the piston side chamber,
A vibration detection valve according to any one of claims 1 to 7, which is provided in the middle of the second communication passage or the third communication passage, and a lock mechanism having a lock valve that opens and closes by opening and closing the vibration detection valve. ,
A damper characterized by having.

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