JP4703879B2 - Attenuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attenuation device that is optimal for seismic isolation, for example.
[0002]
[Prior art]
FIG. 2 shows a conventionally known damping device for seismic isolation.
The conventional damping device includes a first cylinder tube 1 and a second cylinder tube 2 positioned outside the first cylinder tube 1 and forms a space between the tubes 1 and 2. The first cylinder tube 1 has its one end 1 a fitted to the rod side closing member 3. On the other hand, the other end 1b fits a main body VB of a third damping valve 14 to be described later to the bottom-side closing member 4.
[0003]
Moreover, the 2nd cylinder tube 2 is fixing the both ends as follows.
That is, the ring-shaped connecting member 5 is fixed to the outer periphery of the rod side blocking member 3, and the second cylinder tube 2 is fitted to the outer periphery of the connecting member 5, and the fitting portion is fixed by welding. Further, the other end 2a of the second cylinder tube 2 is directly fitted into the bottom-side closing member 4, and the fitted portion is fixed by welding.
[0004]
A piston 6 is slidably incorporated in the inner circumference of the first cylinder tube 1 as described above, and a piston rod 7 that moves integrally with the piston 6 is provided on the piston 6. The piston rod 7 is slidably supported in the rod hole 8 of the rod side blocking member 3 and protrudes outward from the blocking member 3.
The piston 6 partitions the inside of the first cylinder tube 1 into a rod side chamber 9 and a bottom side chamber 10.
[0005]
Furthermore, the piston 6 is provided with a first damping valve 11 and a second damping valve 12 that communicate the rod side chamber 9 and the bottom side chamber 10. The first damping valve 11 permits only the oil flow from the rod side chamber 9 to the bottom side chamber 10, and the second damping valve 12 permits only the oil flow from the bottom side chamber 10 to the rod side chamber 9. Therefore, the first damping valve 11 functions when the piston 6 moves in the direction of reducing the volume of the rod side chamber 9, and the first damping valve 12 functions when the piston 6 moves in the direction of reducing the bottom side chamber 10. .
[0006]
Further, a space formed between the first cylinder tube 1 and the second cylinder tube 2 is a tank 13, and the tank 13 and the bottom side chamber 10 are communicated with each other via a third damping valve 14. The third damping valve 14 allows the flow from the bottom chamber 10 to the tank 13 and generates a damping force when the flow occurs. Further, a check valve 16 that allows only the flow from the tank 13 to the bottom side chamber 10 is provided between the tank 13 and the bottom side chamber 10.
[0007]
Therefore, when the piston 6 moves in the direction of expanding the bottom side chamber 10, the oil in the rod side chamber 9 is pushed out to the bottom side chamber 10 via the first damping valve 11. However, since the volume of the bottom side chamber 10 is larger by the moving body integral of the piston rod than the rod side chamber 9, the amount of oil in the bottom side chamber 10 is insufficient by the moving body integral of the piston rod. At this time, the oil in the tank 13 pushes open the check valve 16 and flows into the bottom chamber 10 to compensate for the shortage.
[0008]
On the other hand, when the piston 6 moves in the direction of reducing the bottom side chamber 10, the oil in the bottom side chamber 10 flows into the rod side chamber 9 via the second damping valve 12 as described above. However, the volume of the rod side chamber 9 is smaller than the volume of the bottom side chamber 10 by the moving body integral of the piston rod 7. Therefore, the total amount of oil in the bottom side chamber 10 cannot flow into the rod side chamber 9 in the above case, but excess oil at this time is returned to the tank 13 via the third damping valve 14 described above. .
[0009]
Further, the tank 13 and the rod side chamber 9 are communicated with each other through a passage 15 formed in the rod side closing member 3. The passage 15 is a passage for removing air that has entered the rod side chamber 9 and the bottom side chamber 10 when oil is filled therein.
[0010]
The operation of the conventional damping device as described above will be described.
When the piston rod 7 is moved to the left side from the position of FIG. 2 by an external force, the piston 6 is moved to the left side integrally therewith. When the piston 6 moves to the left side, the oil in the rod side chamber 9 is pushed out to the bottom side chamber 10 via the first damping valve 11. However, since the volume of the bottom side chamber 10 is larger by the moving body integral of the piston rod than the rod side chamber 9, the amount of oil in the bottom side chamber 10 is insufficient by the moving body integral of the piston rod. Therefore, the oil in the tank 13 flows into the bottom side chamber 10 via the check valve 16 to compensate for the shortage on the bottom chamber side 9.
[0011]
Thus, when the oil in the rod side chamber 9 flows into the bottom side chamber 10 via the first damping valve 11, a damping force is exhibited and the movement of the piston 6 is buffered. Therefore, in the case of the seismic isolation device, the vibration caused by the earthquake is absorbed.
[0012]
On the other hand, when the piston rod 7 moves to the right side in FIG. 2, the piston 6 also moves to the right side. When the piston 6 moves to the right side, the oil in the bottom side chamber 10 pushed out by the piston 6 flows into the rod side chamber 9 via the first damping valve 12.
However, since the volume of the rod side chamber 9 is smaller than the bottom side chamber 10 by the moving volume of the piston rod, the oil in the bottom side chamber 10 pushed out by the piston 6 cannot flow into the rod side chamber 9. . Therefore, the oil that cannot flow in flows into the tank 13 through the third damping valve 14.
[0013]
Thus, when the piston 6 moves to the right, the oil in the bottom side chamber 10 flows into the rod side chamber 9 via the second damping valve 12, and the oil that could not flow into the rod side chamber 9 is the third damping valve. It flows into the tank 13 through 14. As described above, the oil passes through the second damping valve 12 and the third damping valve 14 to exert a damping force, and the movement of the piston rod 7 due to the external force is buffered.
Thus, when the piston 6 moves to the left or right, the movement of the piston rod 7 due to the external force is buffered, and the vibration caused by the earthquake can be absorbed as described above.
[0014]
In such a damping device, when air enters the rod side chamber 9 or the bottom side chamber 10, the damping force is significantly reduced. Therefore, when air enters, it must be removed from the chambers 9 and 10. In order to remove air from the rod side chamber 9 or the bottom side chamber 10, a passage 15 that connects the rod side chamber 9 and the tank 13 is formed.
That is, when the air in the rod side chamber 9 is removed, the piston rod 7 is moved to the left side in FIG. The piston rod 7 and the piston 6 are full stroked to the left side to push out air from the passage 15 to the tank 13.
[0015]
On the other hand, when the air in the bottom side chamber 10 is vented, the piston rod 7 and the piston 6 are fully stroked to the right in FIG. Thus, when the piston rod 7 and the piston 6 are fully stroked to the right, the bottom side chamber 10 is completely compressed. However, since the air vent passage is not formed in the bottom side chamber 10, the air moves from the sliding surface of the piston 6 to the rod side chamber 9.
[0016]
When the air in the bottom chamber 10 moves to the rod chamber 9 in this way, the piston rod 7 is again fully stroked to the left. When the piston rod 7 is fully stroked to the left, the air in the rod side chamber 9 is pushed out to the tank 13 through the passage 15 as described above.
That is, the above air venting operation is performed by reciprocating the piston rod after assembling the apparatus at the factory.
[0017]
[Problems to be solved by the invention]
In order to completely remove air from the rod side chamber 9 and the bottom side chamber 10 as described above, the piston rod 7 must be full-stroked several times to the left and right. However, when the piston rod 7 is moved, the first damping valve 11, the second damping valve 12, and the third damping valve 14 function to generate a damping force. Therefore, a large force is required to move the piston rod 7 accordingly. Is required.
[0018]
In addition, since the air in the bottom side chamber 10 must be removed through the sliding surface of the narrow piston 6, there are problems that this air removal operation requires a lot of time and is inefficient.
[0019]
Further, the passage 15 is left open even after the air venting operation is finished. Therefore, a slight amount of oil in the rod side chamber 9 leaks into the tank 13 during the operation of the damping device, or air is sucked into the rod side chamber 9 from the tank 13. If the oil leaks into the tank 13 or sucks air from the tank 13 in this way, the damping characteristics of the apparatus will be affected. That is, there is a problem that the attenuation characteristic at the time of setting changes.
An object of the present invention is to provide an attenuation device that can easily remove air while maintaining the attenuation characteristics at the time of setting.
[0020]
The first invention is a piston that is slidably incorporated in the first cylinder tube, a piston rod that moves together with the piston, and a piston that moves in a direction that reduces the volume of the rod side chamber. A damping valve that exhibits a damping force when the piston is moved, a damping valve that is provided on the piston and that exhibits a damping force when the piston moves in a direction to reduce the bottom side chamber, and a rod side chamber and a bottom side chamber partitioned by the piston, A rod-side closing member for closing the rod-side chamber, a bottom-side closing member for closing the bottom-side chamber, a second cylinder tube located outside the first cylinder tube and coupled to the closing member, and the first a tank provided between the cylinder tube and the second cylinder tube, to the rod side closing member A first passage for venting air that opens the rod side chamber to the atmosphere is provided , a stopper is provided at the opening of the first passage, and a control mechanism body having a damping valve is incorporated in the bottom side closing member. The main body is provided with a third passage for venting air at a position avoiding the damping valve, and is also provided with a second passage for venting air on the bottom side closing member, and these second and third passages are communicated with each other. A plug is provided at the opening of the second passage .
[0021]
The second invention forms a protrusion fitting into one of the control member body and the bottom closure member, to form a recess fitted to the convex portion to the other, with these said protrusion The second and third passages are communicated with each other through a fitting portion of the recess .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention. In this embodiment, a third damping valve 23 and a check valve 24 are provided as a control mechanism for controlling the damping force. The rod-side closing member 19 includes the first passage 25, and the bottom-side closing member 20 includes the second passage 26. The components other than this feature are the same as in the conventional example. The same components as those in the conventional example are denoted by the same reference numerals as those in the conventional example, and detailed description thereof is omitted.
[0023]
In this embodiment, one end 17a of the first cylinder tube 17 is directly coupled to the rod side blocking member 19 by connection means having a screw structure. Further, the other end 17b of the first cylinder tube 17 is directly coupled to the bottom-side closing member 20 by connection means having the same screw structure.
A nut member 21 is screwed into the first cylinder tube 17, and a cap 22 is fixed to the bottom side closing member 20. The nut member 21 and the cap 22 are used as a connecting member for connecting the second cylinder tube 18. That is, the second cylinder tube 18 has one end 18 b connected to the cap 22 and the other end 18 a fixed by fastening the nut member 22 to the first cylinder tube 17.
[0024]
The bottom chamber 10 is provided with a third damping valve 23 and a check valve 24 in the control mechanism main body 27 as a mechanism for controlling the damping force. The control mechanism main body 27 is formed with a fitting convex portion 30 at the center thereof, and the fitting convex portion 30 is fitted in a fitting concave portion 29 formed on the bottom-side closing member 20.
By fitting the fitting convex portion 30 into the fitting concave portion 29 as described above, the centers of the control mechanism main body 27 and the first cylinder tube 1 are necessarily aligned.
[0025]
The third damping valve 23 is configured to allow only the oil flow from the bottom chamber 10 to the tank 13 and to generate a damping force when the flow occurs. Further, the check valve 24 allows only the oil flow from the tank 13 to the bottom chamber 10.
[0026]
Further, the rod-side closing member 19 is provided with a first passage 25. One end 25a of the first passage 25 is opened to the rod-side chamber 9, and the other end 25b is released to the outside. The one end 25a is normally closed with a plug C1.
Further, the second passage 26 is formed in the bottom-side closing member 20, and the third passage 28 is formed in the control mechanism main body 27.
The second passage 26 has one end 26a opened in the fitting recess 29 and the other end 26b released to the outside. The one end 26a is normally closed with a plug C2.
The third passage 28 has one end 28 a opened to the bottom side chamber 10 and the other end 28 b opened to the fitting convex portion 30. Since the other end 28b of the third passage 28 is opened to the fitting convex portion 30 in this way, the second passage 26, the third passage 28, and the like can be obtained by fitting the fitting convex portion 30 into the fitting concave portion 29. Will inevitably communicate.
[0027]
In the damping device S of the embodiment as described above, the damping force is exhibited by the first damping valve 11, the second damping valve 12, and the third damping valve 23, which is the same as in the prior art. That is, when the piston rod 7 moves to the left side from the position of FIG. 1 by an external force, the oil in the rod side chamber 9 flows into the bottom side chamber 10 via the first damping valve 11. At this time, the first damping valve 11 exhibits a damping force, and the movement of the piston 6 is buffered.
[0028]
On the other hand, when the piston rod 7 moves to the right in FIG. 1, the oil in the bottom side chamber 10 flows into the rod side chamber 9 through the second damping valve 12, and the oil that could not flow into the rod side chamber 9 is the third. It flows into the tank 13 through the damping valve 23. In this way, the oil passes through the second damping valve 12 and the third damping valve 23 to exert a damping force, and the movement of the piston rod 7 due to the external force is buffered.
If the movement of the piston rod 7 is buffered in this way, in the case of a seismic isolation device, the vibration caused by the earthquake is absorbed.
[0029]
Next, the action when the rod side chamber 9 or the bottom side chamber 10 is vented in the damping device S will be described.
When the air is released from the rod side chamber 9, the rod side chamber 9 having the first passage 25 is set up, the bottom side chamber 10 is set down, and the left side of the damping device S in FIG. Thus, when the damping device S is set up so that the first passage 25 side of the rod side chamber 9 is on the upper side, the air floats upward, that is, on the first passage 25 side, and accumulates there.
[0030]
When air accumulates on the first passage 25 side in this way, the piston rod 7 is lifted upward. That is, the piston rod 7 is moved to the left side in FIG. When the piston rod 7 moves, the piston 6 also moves to the left side in FIG. 1, and the air accumulated on the first passage 25 side is released to the atmosphere through the first passage 25.
At this time, the moving amount of the piston rod 7 may be such that the air accumulated on the first passage 25 side can be pushed out to the atmosphere. Therefore, it is not necessary to make a full stroke of the piston rod 7, and the stroke amount of the piston rod 7 may be small.
[0031]
Therefore, the movement of the piston rod 7 for extracting air from the rod side chamber 9 may be a short distance, and it is not necessary to make the piston rod 7 full stroke. This air can be well vented.
Furthermore, when the piston rod 7 is moved as described above, since the first passage 25 is opened to the atmosphere, almost no damping force is generated in the first damping valve 11. Therefore, the piston rod 7 can be further moved with a small force.
In addition, when air is extracted through the first passage 25 in this way, a plug C1 is provided at the other end 25b of the first passage 25 so that oil does not leak.
[0032]
On the other hand, when venting the bottom chamber 10, the damping device S is set up in the opposite direction. That is, the damping device S is erected so that the bottom side chamber 10 having the third passage 28 is up, the rod side chamber 9 is down, and the left side in FIG. 1 is up. When the damping device S is set up in this way, air having a specific gravity lower than that of oil floats upward. That is, the air in the bottom chamber 10 floats to the one end 28a side of the third passage 28, and the air accumulates on the one end 28a side.
[0033]
When the air floats in this way, the piston rod 7 is moved upward. That is, the piston rod 7 is moved to the right side in FIG. When the piston rod 7 moves in this way, the air accumulated in the piston 6 on the one end 28a side of the third passage 28 moves to the third passage 28 side, and then enters the atmosphere via the third passage 28 and the second passage 26. Released.
[0034]
At this time, the moving amount of the piston rod 7 may be such that the air accumulated on the one end 28a side of the third passage 28 can be pushed out to the atmosphere. Therefore, it is not necessary to make a full stroke of the piston rod 7, and the stroke amount of the piston rod 7 may be small.
[0035]
Therefore, when the air is removed from the bottom chamber 10, the distance for moving the piston rod 7 may be small. That is, since it is not necessary to make the piston rod 7 make a full stroke, air can be efficiently extracted. In addition, since this air can be extracted without passing through the sliding surface of the piston 6, the time required for air removal is shortened.
Further, when moving the piston rod 7 as described above, since the bottom chamber 10 is open to the atmosphere through the third passage 28, most damping force in the third damping valve 2 3 does not occur. Therefore, the piston rod 7 can be moved with a smaller force.
In addition, when the air removal from the bottom side chamber 10 is finished in this way, a plug C2 is attached to the other end 26b of the second passage 26 so that oil does not leak.
[0036]
In the above embodiment, the rod side chamber 9 is provided with the first passage 25 for air venting, and the bottom side chamber 10 is also provided with the second passage 26 and third passage 28 for air venting. The air can be extracted from the first passage 25, the second passage 26, and the third passage 28 only by slightly moving. That is, unlike the prior art, it is not necessary to make the full stroke of the piston rod 7, so that the working efficiency is remarkably improved.
[0037]
Further, after the air is removed from the first passage 25 as described above, the plug C1 is plugged into the first passage 25. In addition, after the air is removed from the second passage 26 and the third passage 28, the second passage 26 is plugged C2. Therefore, when the air venting is finished, the rod side chamber 9 and the bottom side chamber 10 are tightly sealed. By being tightly sealed, it is possible to prevent oil from leaking from the passage and affecting its damping characteristics as in the conventional case. That is, the attenuation device S of this embodiment can exhibit the set attenuation characteristics.
[0038]
Further, as described above, the fitting recess 29 is provided at the center of the bottom-side closing member 20 so that the end 26a of the second passage 26 is opened in the fitting recess 29, and at the center of the control mechanism main body 27. A fitting convex portion 30 is provided, and the other end 28 b of the third passage 28 is opened in the fitting convex portion 30. Therefore, the second passage 26 and the third passage 28 can be communicated with each other only by fitting the fitting convex portion 30 to the fitting concave portion 29, and the bottom side chamber 10 can be opened to the atmosphere by this communication. .
[0039]
Further, the fitting concave portion 29 is positioned at the center of the bottom-side closing member 20, and the fitting convex portion 30 is positioned at the center of the control mechanism main body 27. Therefore, when the control mechanism main body 27 is assembled to the bottom-side closing member 20, the fitting convex portion 30 always fits within the fitting concave portion 29 of the bottom-side closing member 20 no matter how the control mechanism main body 27 rotates.
On the other hand, when the fitting concave portion 29 and the fitting convex portion 30 are located at positions deviated from the center, they must be relatively matched. Therefore, it must be aligned to fit them. In this embodiment, since such alignment is not required, work efficiency is improved accordingly.
[0040]
Moreover, since the said 1st channel | path 25 and the 2nd channel | path 26 have open | released the other ends 25b and 26b to the exterior of the damping device S, these can also be utilized as an oiling port. That is, oil can be replenished from the other end 25b or 26b after air bleeding.
In this way, the oil is directly supplied to the rod side chamber 9 via the first passage 25 or to the bottom side chamber 10 via the second passage 26 and the third passage 28, thereby passing through the tank 13. The replenishment time is shortened compared to oil replenishment.
[0041]
In this embodiment, one end 17a of the first cylinder tube 17 is directly coupled to the rod side blocking member 19 by a screw structure. Further, the other end 17b of the first cylinder tube 17 is directly coupled to the bottom-side closing member 20 using a screw structure by a connecting means.
Thus, since the 1st cylinder tube 17 is combined with each closure member 19 and 20 with a screw, the binding force of the 1st cylinder tube 17 and closure member 19 and 20 can be strengthened more.
[0042]
Accordingly, since the tensile force can be received by the first cylinder tube 17, it is not necessary to receive the tensile force by the second cylinder tube 18. Since the second cylinder tube 18 does not need to receive a pulling force, the second cylinder tube 18 does not have to be thick as in the related art. That is, the second cylinder tube can be thinned. As the second cylinder tube becomes thinner, the weight of the entire attenuation device can be reduced, and the attenuation device itself can be reduced in size.
Moreover, as a connection means, not only a screw structure but welding may be used.
By reducing the weight of the entire damping device and reducing the size as described above, it becomes easier to stand up the damping device when venting air, and air venting is further simplified.
[0043]
【The invention's effect】
According to the first aspect of the present invention, since the air vent passages for opening the bottom chamber and the rod chamber to the atmosphere are provided in the bottom blocking member and the rod blocking member, respectively, the piston rod is slightly opened to release air. You don't have to make a full stroke. Furthermore, since air can be extracted without passing through the sliding surface of the piston, the time for air removal is shortened. Therefore, the time required for air removal can be shortened and the work efficiency can be remarkably improved.
Furthermore, since the air vent passage provided in the bottom chamber is provided at a position avoiding the damping valve, the damping valve can be bypassed and air can be vented. Therefore, when the air is extracted, it is not necessary to open the damping valve, and the air can be extracted with a small force.

[0045]
According to the second aspect of the present invention, since the fitting convex portion is formed on one of the control mechanism main body and the bottom-side closing member and the fitting concave portion is formed on either one of the above, the fitting convex portion and the fitting concave portion are formed. The control mechanism main body and the bottom-side closing member can be connected by simply fitting them together. Therefore, this connection becomes easy and the time for this is shortened.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a view showing a conventional damping device.
[Explanation of symbols]
S damping device 6 piston 7 piston rod 9 rod side chamber 10 bottom side chamber 13 tank 19 rod side closing member 20 bottom side closing member 23 third damping valve 24 check valve 25 first passage 26 second passage 28 third passage 29 fitting recess 30 Fitting projection C1 plug C2 plug

Claims (2)

A piston that is slidably incorporated in the first cylinder tube, a piston rod that moves integrally with the piston, and a piston that is provided on the piston, and that provides a damping force when the piston moves in a direction that reduces the volume of the rod side chamber. A damping valve to be exhibited, a damping valve provided on the piston and exhibiting damping force when the piston moves in a direction to reduce the bottom side chamber, a rod side chamber and a bottom side chamber partitioned by the piston, and the rod side chamber are closed. A rod-side closing member that closes the bottom-side chamber, a second cylinder tube that is located outside the first cylinder tube and is coupled to the closing member, and the first cylinder tube and the second cylinder a tank provided between the tubes, large rod-side chamber to the rod side closing member A first passage for air vent which opens provided, a stopper is provided in the opening of the first passage, the said bottom side closure member incorporates a control mechanism body comprising a damping valve, a control mechanism body A third passage for venting air is provided at a position avoiding the damping valve, and a second passage for venting air is also provided on the bottom side closing member, and these second and third passages are communicated with each other. Attenuator with a plug at the opening . One of the control mechanism main body and the bottom-side closing member is formed with a fitting convex part, and the other is formed with a concave part fitted to the convex part, and the fitting part of the convex part and the concave part is formed. The damping device according to claim 1 , wherein the second and third passages are communicated with each other .

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