JP2004138103A - Damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping device capable of preventing supply delay of hydraulic oil caused by cracking pressure of a check valve. <P>SOLUTION: In this damping device, a first pressure chamber 22 and a second pressure chamber 23 in a cylinder 20 are communicated with each other by a first pressure control valve 25 and a second pressure control valve 27, and a first passage 28 to connect the first pressure chamber 22 to an operation fluid holding mechanism A and a second passage 32 to connect the second pressure chamber 23 to an operating fluid holding mechanism A are provided. This damping device is also provided with a first operation check valve 29 provided in the first passage 28, a second operation check valve 33 provided in the second passage 32, a first orifice 31 to communicate the upstream side of the first operation check valve 29 with the downstream side, and a second orifice 35 to communicate the upstream side of the second operation check valve 33 with the downstream side. The first operation check valve 29 is opened by high pressure generated in the second pressure chamber 23. The second operation check valve 33 is opened by high pressure generated in the first pressure chamber 22. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a damping device used for a seismic isolation mechanism or a vibration control mechanism, for example.
[0002]
[Prior art]
As a damping device used for a seismic isolation mechanism or a vibration control mechanism, for example, a damping apparatus shown in FIG.
In this conventional example, as shown in the drawing, the interior of a cylinder 1 is partitioned into a first pressure chamber 3 and a second pressure chamber 4 by a piston 2, and the first pressure chamber 3 and the second pressure chamber 4 are separated from each other by a first pressure chamber. The pressure regulating valve 5 and the second pressure regulating valve 6 communicate with each other.
The first pressure regulating valve 5 opens when the piston 2 moves rightward in the drawing by the action of an external force and the pressure in the first pressure chamber 3 reaches a predetermined pressure. In the process of guiding the pressure oil in the first pressure chamber 3 to the second pressure chamber 4, a flow resistance is given, and the moving speed of the piston 2 in the right direction is attenuated.
On the other hand, the second pressure regulating valve 6 is opened when the piston 2 moves leftward in the drawing by the action of an external force and the pressure in the second pressure chamber 4 reaches a predetermined pressure. Then, in the process of guiding the pressure oil in the second pressure chamber 4 to the first pressure chamber 3, a flow resistance is given, and the moving speed of the piston 2 in the left direction is attenuated.
[0003]
An accumulator 7 is connected to the first pressure chamber 3 and the second pressure chamber 4 via check valves 8, 9 and orifices 10, 11, respectively. The accumulator 7 is for replenishing a shortage of supply flow generated in the other pressure chambers 4 and 3 when the pressure oil in one of the pressure chambers 3 and 4 is compressed. For example, when the pressure oil in the first pressure chamber 3 is compressed, the flow rate supplied to the second pressure chamber 4 via the first pressure regulating valve 5 is insufficient, and the insufficient amount is supplied from the accumulator 7 to the check valve 8. The pressure is supplied to the second pressure chamber 4 through the second pressure chamber 4. Contrary to the above, when the pressure oil in the second pressure chamber 4 is compressed, the flow rate supplied to the first pressure chamber 3 becomes insufficient, and the insufficient amount is supplied from the accumulator 7 to the first pressure chamber 3 via the check valve 9. It is supplied to the chamber 3.
[0004]
By supplying insufficient pressure oil from the accumulator 7 as described above, a negative pressure is prevented from being generated in the first and second pressure chambers 3 and 4.
If the supply amount to the first and second pressure chambers 3 and 4 is insufficient, a negative pressure is generated in the first and second pressure chambers 3 and 4, and the movement of the piston 2 is regulated by the negative pressure. Is done. For example, when the piston 2 attempts to move leftward in a state where a negative pressure is generated in the first pressure chamber 3, the leftward movement of the piston 2 is restricted. When the movement of the piston 2 is restricted in this way, the predetermined damping characteristic set by the second pressure regulating valve 6 cannot be obtained. In order to prevent such an inconvenience, insufficient pressure oil is replenished from the accumulator 7 to prevent the generation of a negative pressure.
[0005]
The orifices 8 and 9 are for guiding excess pressure oil to the accumulator 7 when the compressed pressure oil returns to the original volume.
[0006]
[Patent Document 1]
Japanese Patent No. 2528589 (pages 3 to 4, FIG. 2)
[0007]
[Problems to be solved by the invention]
In the above-described conventional apparatus, the pressure oil in the accumulator 7 is supplied to the first and second pressure chambers 3 and 4 via the check valves 8 and 9. The predetermined flow rate is not flowed until the cracking pressure is reached. That is, the supply of the pressure oil from the accumulator 7 to the first and second pressure chambers 3 and 4 is delayed by the cracking pressure. Then, there is a problem that the set attenuation characteristic cannot be obtained due to the delay.
An object of the present invention is to provide a damping device capable of preventing a delay in supply of pressure oil caused by cracking pressure of check valves 8 and 9.
[0008]
[Means for Solving the Problems]
According to the first invention, the inside of the cylinder is partitioned into a first pressure chamber and a second pressure chamber by a piston, and the first pressure chamber and the second pressure chamber are communicated with each other by a first pressure regulating valve and a second pressure regulating valve. On the other hand, the first passage connecting the first pressure chamber to the hydraulic oil holding mechanism, the second passage connecting the second pressure chamber to the hydraulic oil holding mechanism, and the hydraulic oil holding mechanism provided in the first passage. Operated check valve that allows only the flow from the first pressure chamber to the second pressure chamber, and a second operation check that is provided in the second passage and allows only the flow from the hydraulic oil holding mechanism side to the second pressure chamber. A first orifice communicating between an upstream side and a downstream side of the first operated check valve, and a second orifice communicating between an upstream side and a downstream side of the second operated check valve; Operating Check valve opens the high pressure generated in the second pressure chamber, the second operate check valve is characterized in that a configuration be opened by a high pressure generated in the first pressure chamber.
[0009]
In a second aspect based on the first aspect, the first operated check valve and the second operated check valve are a valve body, a first poppet and a second poppet incorporated in the valve body with their seat surfaces facing each other. A poppet, a through hole formed in the first poppet and communicating between the first pilot chamber communicating with the first pressure chamber and the hydraulic oil holding mechanism side, and a through hole formed in the second poppet and communicating with the second pressure chamber One was slidably inserted into the through hole communicating the second pilot chamber and the hydraulic oil holding mechanism side, and the other was slidably inserted into the through hole of the second poppet. A push member, wherein a movement restricting portion is formed on the outer periphery of the push member between the first poppet and the second poppet, and the push member is provided in the first pilot chamber or the second poppet. When moved by the action of the pressure in the pilot chamber, the movement restricting portion provided on the push member hits a part of the second or first poppet, so that the seat surface of the second or first poppet is formed on the valve body. The second pressure chamber or the first pressure chamber is configured to communicate with the hydraulic oil holding mechanism apart from the seat portion.
[0010]
According to a third aspect, in the second aspect, the push member is divided into a first poppet side and a second poppet side.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In the first embodiment shown in FIGS. 1 and 2, the inside of a cylinder 20 is divided into a first pressure chamber 22 and a second pressure chamber 23 by a piston 21, and the first pressure chamber 22 and the second pressure chamber 23 are separated from each other. Are communicated via the passage 24 and the passage 26.
A first pressure regulating valve 25 is provided in the passage 24. The first pressure regulating valve 25 opens when the piston 21 moves leftward in the drawing due to the action of an external force and the inside of the second pressure chamber 22 reaches a predetermined pressure. Then, in the process of guiding the pressure oil in the second pressure chamber 23 to the second pressure chamber 22, flow resistance is given, and the moving speed of the piston 21 to the left is attenuated.
[0012]
The passage 26 is provided with a second pressure regulating valve 27. The second pressure regulating valve 27 opens when the piston 21 moves rightward in the drawing due to the action of an external force and the inside of the first pressure chamber 22 reaches a predetermined pressure. In the process of guiding the pressure oil in the first pressure chamber 22 to the second pressure chamber 23, a flow resistance is given, and the moving speed of the piston 21 in the left direction is attenuated.
[0013]
An accumulator A is connected to the first pressure chamber 22 via a first passage 28. The first passage 28 is provided with a first operation check valve 29 that allows only the flow from the accumulator A side to the first pressure chamber 22 side. Further, an upstream side and a downstream side of the first operation check valve 29 are communicated by a first orifice 31.
On the other hand, an accumulator A is connected to the second pressure chamber 23 via a second passage 32. The second passage 32 is provided with a second operation check valve 33 that allows only the flow from the accumulator A side to the second pressure chamber 23 side.
[0014]
The first operation check valve 29 is connected to the second passage 32 via the pilot line 30, and guides the pressure in the second pressure chamber 23 to the first operation check valve 29. When the pressure in the second pressure chamber 23 becomes equal to or higher than a predetermined pressure, the first operation check valve 29 is opened.
The second operation check valve 33 is connected to the first passage 28 via a pilot line 34, and guides the pressure in the first pressure chamber 22 to the second operation check valve 33. When the pressure in the first pressure chamber 22 becomes equal to or higher than a predetermined pressure, the second operation check valve 33 is opened.
The front and rear of the first operation check valve 39 are communicated through a first orifice 31, and the front and rear of the second operation check valve 33 are communicated through a second orifice 35.
[0015]
Next, the operation of the first embodiment will be described.
For example, when the piston 21 moves rightward in the drawing and the pressure oil in the first pressure chamber 22 is compressed, the pressure in the first pressure chamber 22 increases. When this pressure exceeds the set pressure, the second pressure regulating valve 27 opens, and the pressure oil in the first pressure chamber 22 is led to the second pressure chamber 23. In this way, the flow resistance is given in the process of guiding the pressure oil, and the rightward movement of the piston 21 is attenuated.
[0016]
Further, when the pressure in the first pressure chamber 22 rises, the second operating check valve 33 is set to open by the pressure. When the second operation check valve 33 is opened, the second pressure chamber 23 and the actuator A communicate with each other via the second passage 32, so that the pressure oil in the first pressure chamber 22 is compressed, and the second pressure Even when the flow rate is insufficient in the chamber 23, the insufficient flow rate is supplied from the accumulator A to the second pressure chamber 23 via the second pilot check valve 33. Therefore, even if the pressure oil in the first pressure chamber 22 is compressed, the second pressure chamber 23 does not become a negative pressure.
[0017]
On the other hand, when the piston 21 moves to the left in the drawing and the pressure oil in the second pressure chamber 23 is compressed, the pressure in the second pressure chamber 23 increases. When this pressure exceeds the set pressure, the first pressure regulating valve 25 opens, and the pressure oil in the second pressure chamber 23 is guided to the first pressure chamber 22. The flow resistance is given in the process of guiding the pressure oil in this manner, and the rightward moving speed of the piston 21 is attenuated.
[0018]
Further, when the pressure in the second pressure chamber 23 rises, the first operating check valve 29 is set to open by the pressure. When the first operation check valve 29 is opened, the first pressure chamber 22 and the actuator A communicate with each other via the first passage 28. Therefore, when the supply flow rate is insufficient in the first pressure chamber 22, the insufficient flow rate is supplied from the accumulator A to the first pressure chamber 22 via the first pilot check valve 29. Therefore, even if the pressure oil in the second pressure chamber 23 is compressed, the first pressure chamber 22 does not become a negative pressure.
[0019]
As described above, according to the first embodiment, when the pressure in the first pressure chamber 22 or the second pressure chamber 23 increases, the second operation check valve 29 or the first operation check valve 33 opens. Therefore, the pressure oil can be supplied to the first and second pressure chambers 22 and 23 more quickly than in the conventional example in which the check valve is not opened until the cracking pressure is reached. Therefore, a negative pressure does not occur in the first and second pressure chambers.
Since the generation of the negative pressure can be prevented in this manner, a predetermined damping characteristic set by the first and second pressure regulating valves 25 and 27 can be obtained.
The orifice 33 is for returning excess pressure oil to the accumulator 7 when the pressure oil compressed in the first pressure chamber 22 returns to the original volume, and the orifice 35 is for the second pressure. When the pressurized oil compressed in the chamber 23 returns to the original volume, the excess pressurized oil is returned to the accumulator A. Further, these orifices 33 and 35 also have a function of absorbing a volume change of the pressure oil generated according to the oil temperature.
[0020]
FIG. 2 is a cross-sectional view showing a specific structure of a portion surrounded by a chain line B in FIG. Therefore, hereinafter, the same components as those in FIG.
As shown in the figure, mounting holes 41 and 42 are formed in the valve body 40, a first poppet 43 is slidably mounted in one mounting hole 41, and a second poppet 44 is slid in the other mounting hole 42. It is movably incorporated.
A spring 49 is installed in the mounting hole 41, and the seat surface 43 a of the first poppet 43 is pressed against a seat portion 45 formed on the valve body 40 by the elastic force of the spring 49. By pressing the first poppet 43 against the seat portion 45 in this manner, a first pilot chamber 61 is formed in the first mounting hole 41. The pilot chamber 61 communicates with the first pressure chamber 22 of the cylinder 20 via a communication hole 47 formed in the first poppet 43 and a cylinder port 36 formed in the valve body 40.
[0021]
In addition, a spring 50 is installed in the assembling hole 42, and the seat surface 44 a of the second poppet 44 is pressed against the seat portion 46 formed in the valve body 40 by the elastic force of the spring 50. By pressing the second poppet 44 against the seat portion 46 in this manner, a second pilot chamber 62 is formed in the second mounting hole 42. The pilot chamber 62 communicates with the second pressure chamber 23 of the cylinder 20 via a communication hole 48 formed in the second poppet 44 and a cylinder port 37 formed in the valve body 40.
[0022]
The valve body 40 has a communication passage 67 communicating the first mounting hole 41 and the second mounting hole 42, and the communication passage 67 communicates with the supply / discharge port 38. The accumulator A is connected to the supply / discharge port 38.
In the first poppet 43, a through hole 43b is formed, and a push member 51 is slidably inserted into the through hole 43b.
On the other hand, a through hole 44b is also formed in the second poppet 44, and a push member 54 is slidably inserted into the through hole 44b.
[0023]
The push members 51 and 54 have enlarged diameter portions 51a and 54a, respectively, so that the enlarged diameter portions 51a and 54a abut each other.
In addition, passages 52, 55 are formed in the push members 51, 54, and orifices 33, 35 are formed in the passages 52, 55. When the pressure oil in the first and second pressure chambers 23, 23 of the cylinder 20 expands due to a temperature change, the passages 52, 55 provided with the orifices 33, 35 supply the expanded pressure oil to the accumulator. This is to escape to the A side.
The end surfaces of the passages 52, 55 on the side of the enlarged diameter portions 51a, 54a are enlarged to form enlarged portions 59, 60 so that the two passages 52, 55 can communicate even if a misalignment occurs during assembly. .
[0024]
When the high pressure generated in the first pressure chamber 22 is guided to the cylinder port 36 → the communication hole 47 → the first pilot chamber 61, the push members 51 and 54 as described above operate by one of the push members 51 Moves to the left of the drawing. When the push member 51 moves in this manner, the other push member 54 is pushed. When the enlarged diameter portion 54 a of the push member 54 comes into contact with the tip of the second poppet 44, a thrust in the left direction in the drawing is given to the second poppet 44. When the thrust given to the second poppet 44 in this way exceeds the elastic force of the spring 50, the second poppet 44 moves to the left, and the seat surface 44a separates from the seat portion 46.
[0025]
When the seat surface 44a of the second poppet 44 separates from the seat portion 46, the second pressure chamber 23 is connected to the accumulator via the passage 32 → the cylinder port 37 → the second mounting hole 42 → the communication passage 67 → the supply / discharge port 38. Connect to A. That is, the second operation check valve 33 is opened. Since the second operation check valve 33 is thus open, when the supply flow rate is insufficient in the second pressure chamber 23, the pressure oil in the accumulator A is quickly supplied to the second pressure chamber 23. Therefore, it is possible to prevent the inside of the second pressure chamber 23 from becoming negative pressure.
[0026]
On the other hand, when a high pressure is generated in the second pressure chamber 23, the high pressure is guided to the cylinder port 37 → the communication hole 48 → the second pilot chamber 62. Then, the push member 54 moves rightward in the drawing by the action of the pressure guided to the second pilot chamber 62. When the push member 54 moves rightward, the push member 51 is pushed. When the enlarged diameter portion 51a of the push member 51 comes into contact with the tip of the first poppet 43, a thrust in the right direction in the drawing is given to the first poppet 43. When the thrust exceeds the elastic force of the spring 49, the first poppet 43 moves rightward, and the seat surface 43a separates from the seat portion 45.
[0027]
When the seat surface 43a of the first poppet 43 separates from the seat portion 45, the first pressure chamber 22 is connected to the accumulator via the passage 28 → the cylinder port 36 → the first mounting hole 41 → the communication passage 67 → the supply / discharge port 38. Connect to A. Therefore, when the supply flow rate is insufficient in the first pressure chamber 22, the pressure oil in the accumulator A is quickly supplied to the first pressure chamber 22. Therefore, it is possible to prevent the first pressure chamber 22 from becoming negative pressure.
[0028]
In the first embodiment, the push members 51 and 54 are provided with the orifices 31 and 35, however, as in the second embodiment shown in FIG. 3, the orifices 31 are provided in the passage 63 formed in the first poppet 43. The orifice 35 may be provided in a passage 64 formed in the second poppet 44.
Further, as in the third embodiment shown in FIG. 4, the orifice 31 may be provided in the passage 65 formed in the valve body 40, and the orifice 35 may be provided in the passage 66 formed in the valve body 40.
That is, the orifice 31 may be provided in the process of connecting the first pilot chamber 61 and the communication passage 67, and the orifice 35 may be provided in the process of connecting the second pilot chamber 62 and the communication passage 67. Therefore, the orifice 31 may be provided in an external passage connecting the first pilot chamber 61 and the communication passage 67, and the orifice 35 may be provided in an external passage connecting the second pilot chamber 62 and the communication passage 67.
[0029]
In the first to third embodiments, the accumulator A is used as the hydraulic oil holding mechanism of the present invention, but a tank may be used instead of the accumulator A. That is, the hydraulic oil holding mechanism only needs to have a function capable of supplying insufficient pressure oil in order to prevent negative pressure in the first and second pressure chambers 22 and 23 of the cylinder 20.
Further, in the first to third embodiments, the first push member 51 and the second push member 54 are separate bodies, but these two members may be integrated. However, when the first push member 51 and the second push member 54 are separated on the first poppet 43 side and the second poppet 44 side, the center of the first poppet 51 and the second poppet 54 is shifted. However, the displacement can be absorbed by the contact surface.
Further, in the first to third embodiments, the movement restricting portion is configured by the enlarged diameter portions 51a and 54a, but may be configured by the convex portion.
[0030]
【The invention's effect】
According to the first invention, the first operation check valve is opened by the high pressure generated in the second pressure chamber, and the second operation check valve is opened by the high pressure generated in the first pressure chamber. Therefore, the check is performed until the cracking pressure is reached. As compared with the conventional example in which the valve is not opened, the hydraulic oil can be quickly supplied from the hydraulic oil holding mechanism to the first and second pressure chambers.
Therefore, a negative pressure does not occur in the first and second pressure chambers, and a predetermined damping characteristic set by the first and second pressure regulating valves can be obtained.
[0031]
According to the second aspect, when the push member moves by the action of the pressure guided to the first pilot chamber or the second pilot chamber, the movement restricting portion provided on the push member moves the second poppet or a part of the first poppet. The second poppet or the first poppet is separated from the seat portion formed in the valve body, and the second pressure chamber or the first pressure chamber communicates with the hydraulic oil holding mechanism. The hydraulic oil can be quickly supplied from the hydraulic oil holding mechanism to the first and second pressure chambers as compared with the conventional example in which the hydraulic oil does not open until the pressure reaches the cracking pressure.
Therefore, a negative pressure does not occur in the first and second pressure chambers, and a predetermined damping characteristic set by the first and second pressure regulating valves can be obtained.
[0032]
According to the third aspect, since the push member is divided into the first poppet side and the second poppet side, the push member is formed on each poppet even if the axes of the first poppet and the second poppet are misaligned. It can be assembled in a through hole.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a first embodiment.
FIG. 2 is a sectional view showing a specific structure of a portion B in FIG.
FIG. 3 is a sectional view of a second embodiment.
FIG. 4 is a sectional view of a third embodiment.
FIG. 5 is a circuit diagram of a conventional example.
[Explanation of symbols]
A Accumulator 20 Cylinder 21 Piston 22 First pressure chamber 23 Second pressure chamber 25 First pressure regulating valve 27 Second pressure regulating valve 28 First passage 29 First operating check valve 31 First orifice corresponding to hydraulic oil holding mechanism of the present invention 32 second passage 33 second operated check valve 35 second orifice 40 valve body 43a, 44a seat surface 43 first poppet 44 second poppet 45, 46 seat portion 43b, 44b through hole 51, 54 push member 61 first pilot chamber 62 2nd pilot room

Claims (3)

The interior of the cylinder is partitioned into a first pressure chamber and a second pressure chamber by a piston, and the first pressure chamber and the second pressure chamber are connected to each other by a first pressure regulating valve and a second pressure regulating valve, respectively. A first passage connecting the chamber to the hydraulic oil holding mechanism; a second passage connecting the second pressure chamber to the hydraulic oil holding mechanism; and a first passage provided from the hydraulic oil holding mechanism side to the first pressure chamber side. A first operated check valve that allows only the flow to the second passage, a second operated check valve that is provided in the second passage, and allows only the flow from the hydraulic oil holding mechanism side to the second pressure chamber side; A first orifice communicating the upstream side and the downstream side of the operated check valve; and a second orifice communicating the upstream side and the downstream side of the second operated check valve, wherein the first operated check valve is Opened by the high pressure generated in the second pressure chamber, the second operate check valve, the damping device being characterized in that the arrangement to open the high pressure generated in the first pressure chamber. The first operated check valve and the second operated check valve are formed on a valve body, a first poppet and a second poppet assembled with the seat surfaces thereof facing each other in the valve body, and a first poppet. A through-hole communicating the first pilot chamber and the hydraulic oil holding mechanism side communicating with the pressure chamber, and a second pilot chamber formed in the second poppet and communicating with the second pressure chamber and the hydraulic oil holding mechanism side are connected to each other. A through hole communicating with the first poppet, and a push member having one inserted slidably into the through hole of the first poppet and the other slidably inserted into the through hole of the second poppet. Thus, a movement restricting portion is formed between the first poppet and the second poppet, and the push member is moved by the action of the pressure in the first pilot chamber or the second pilot chamber. Then, when the movement restricting portion provided on the push member hits a part of the second or first poppet, the seat surface of the second poppet or the first poppet is separated from the seat portion formed on the valve body, and the second poppet or the second poppet is separated from the second poppet. The damping device according to claim 1, wherein the pressure chamber or the first pressure chamber communicates with the hydraulic oil holding mechanism. 3. The damping device according to claim 2, wherein the push member is divided into a first poppet side and a second poppet side.

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