JP4858990B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device, and more particularly to, for example, an improvement of a valve device suitable for implementation in a hydraulic shock absorber that is disposed between a floor and a ceiling of each floor of a building and is used as a vibration damper.

  For example, various proposals have conventionally been made as hydraulic shock absorbers that are arranged between floors and ceilings of each floor of a building and are used as vibration dampers. Further, it is disclosed that the damping force generated depending on the sliding position of the piston body in the cylinder body forming the hydraulic shock absorber can be adjusted in level.

  That is, in the hydraulic shock absorber disclosed in Patent Document 1, when the piston body that also forms the hydraulic shock absorber slides within the cylinder body that forms the hydraulic shock absorber, the cylinder body is defined by the piston body. A pair of oil chambers sandwiching the piston body communicate with each other via a damping valve disposed in the piston body, and a predetermined damping force is generated by the damping valve.

  On the other hand, in the hydraulic shock absorber disclosed in Patent Document 1, both the oil chambers in the cylinder body of the hydraulic shock absorber can communicate with each other via a valve device disposed outside the cylinder body. The operation of is realized by the operation of a hydraulic shock absorber.

  That is, first, the valve device is disposed in a bypass path that communicates both the oil chambers in the cylinder body of the hydraulic shock absorber outside the cylinder body, and opens and closes the bypass path when operating.

  In this valve device, the bypass path is formed by a valve housing connected to the cylinder body and a spool as a control valve slidably housed in the valve housing.

  Further, the valve housing is integrally connected to the cylinder body in the hydraulic shock absorber, and the spool is connected to the rod body side which is connected to the piston body in the cylinder body and can be moved in and out of the cylinder body. .

  Further, in the hydraulic shock absorber, when the piston body is in the vicinity of the central portion in the cylinder body, the bypass passage is closed by a spool in the vicinity of the central portion in the valve housing, and the piston body is in the vicinity of the central portion in the cylinder body. When released from the center, the spool is released from the vicinity of the central portion in the valve housing.

  Therefore, in the valve device disclosed in Patent Document 1, when the piston body slides near the center in the cylinder body in the hydraulic shock absorber, the spool keeps the bypass path closed, and the cylinder Both oil chambers in the body are communicated with each other via a damping valve disposed on the piston body, so that a high damping force generation state is realized.

In this valve device, when the piston body in the hydraulic shock absorber slides out of the vicinity of the central portion in the cylinder body, the bypass path is maintained in an open state, and both oil chambers in the cylinder body are It communicates through this open bypass path, and so-called a low damping force generation state is realized.
Japanese Patent Laid-Open No. 2006-161842 (see FIGS. 1, 2 and 4)

  However, in the valve device disclosed in Patent Document 1 described above, there is no particular problem in that it is possible to adjust the level of the generated damping force depending on the expansion / contraction position of the hydraulic shock absorber. It may be pointed out that there is a minor defect in the realization.

  In other words, including the hydraulic shock absorber disclosed in Patent Document 1 described above, when a hydraulic shock absorber of a position-dependent type is used as a vibration damper in a building, the hydraulic shock absorber itself Therefore, it is important to have a so-called margin for the expansion / contraction stroke.

  Therefore, in the hydraulic shock absorber disclosed in Patent Document 1 described above, the same stroke amount as that of the hydraulic shock absorber is guaranteed for the operation of the valve device, that is, the sliding stroke of the spool as the control valve. It needs to be done.

  As a result, in the valve device disclosed in Patent Document 1 described above, for example, when the spool constituting the valve device is lengthened, the workability of the spool is likely to deteriorate and it is difficult to maintain accuracy. In addition, there is a problem that the valve device itself is easily lengthened and difficult to be compacted, and when the hydraulic shock absorber is, for example, a damping damper in a building, its installation property is reduced. There is also a problem that becomes easier.

  The present invention has been developed in view of the above-described present situation, and the object of the present invention is to make it possible to perform a predetermined function while improving the installability, and to make a general use in a hydraulic shock absorber using the same. It is an object of the present invention to provide a valve device that is optimal for expecting improvement in performance.

  In order to achieve the above-described object, the configuration of the valve device according to the present invention is basically the outside of the cylinder body of both one and the other oil chambers defined by the piston body in the cylinder body of the hydraulic shock absorber. A bypass path that enables communication between the bypass passage and a valve housing that forms the bypass path, and is slidably disposed, and when the thrust is input from the outside, either one direction or the other direction in the bypass path is selected. A spool that enables opening of the cylinder and an input means for inputting a thrust to the spool, and the input means follows the sliding of the piston body in the cylinder body in the hydraulic shock absorber and inputs the thrust to the spool. In the valve device in which the input of further thrust to the spool with the bypass passage opened is stopped, the spool is interposed between the valve housing at one end. And the other stopper portion for causing the effective stroke of the spool to appear between the valve housing and the other end portion under the distribution of the input means. The hydraulic shock absorber is connected to the rod body or the fixed side to which the rod body is connected, and the input means is disposed coaxially with the spool so that the other end portion of the spool is present in the cylinder connected to the fixed side. It is assumed that the other end is sandwiched between a pair of balance springs housed in the cylinder.

  Therefore, according to the present invention, an input for operating a spool disposed in a bypass passage that allows communication between both oil chambers outside the cylinder body in the hydraulic shock absorber, that is, an input for inputting a sliding force. In the hydraulic shock absorber, the means slides the spool when the piston body slides in the cylinder body to open the bypass path, while the operation allows further stoppage of the spool that has opened the bypass path. Even if the so-called expansion / contraction stroke exceeds the operating stroke in the spool, that is, exceeds the effective stroke, the input means does not input a thrust force that further slides the spool on the spool.

  As a result, the effective stroke, which is the operating stroke of the spool, can be set independently of the expansion / contraction stroke of the hydraulic shock absorber, and it is only necessary to slightly increase the operating stroke of the spool in consideration of the so-called safety factor. When provided in the valve housing connected to the body, the valve housing can be made compact.

  By the way, in the hydraulic shock absorber, when the piston body that is slidably accommodated in the cylinder body and defines two oil chambers in the cylinder body has a damping valve that allows communication between both oil chambers When the bypass path outside the cylinder body is closed, a high damping force is generated by each damping valve during the expansion / contraction operation in which the rod body protrudes and retracts with respect to the cylinder body.

  In the hydraulic shock absorber, the stroke of the rod body relative to the cylinder body is large. Therefore, when there is an input from the input means to the spool, the bypass path is opened, and both oil chambers in the cylinder body pass this bypass path. Communicate through.

  As a result, the damping valve of the piston body, which was maintained in a high damping force generation state until the bypass path was opened by sliding the spool, The generated damping force is reduced.

  Then, the piston body reverses in the cylinder body and shifts to the reverse stroke. Therefore, when the operation of the spool is released, the bypass passage is closed and a high damping force is generated by the damping valve of the piston body. The

  In the following, the present invention will be described based on the illustrated embodiment. However, the valve device according to the present invention is embodied in a hydraulic shock absorber having a cylindrical shape and a double rod shape. The hydraulic shock absorber is, for example, a vibration damper disposed between a floor and a ceiling of each floor of a building.

  The hydraulic shock absorber shown in FIG. 1 includes both a cylinder body 1 and a pair of cylinders 1 having the same cross-sectional area while being slidably received in the cylinder body 1. An oil chamber, that is, a piston body 2 that defines one oil chamber R1 that is upper in the figure and the other oil chamber R2 that is lower in the figure, and one end connected to the piston body 2 A rod body 3 that passes through the shaft cores of the oil chambers R1 and R2 and projects the tip from the closed end of the cylinder body 1 to the outside, that is, one rod body 31 that has the same cross-sectional area and is upward in the drawing. And the other rod body 32 on the lower side in the figure.

  In this hydraulic shock absorber, the piston body 2 has damping valves 21 and 22 that allow both the oil chambers R1 and R2 to communicate, and the cylinder body 1 includes a spool 4 in a valve device that will be described later. The valve housing 5 that enables the arrangement of the valve housing 5 is integrally connected, and the valve housing 5 has check valves 6 and 7 together.

  By the way, the cylinder body 1 is a so-called cylindrical body because the hydraulic shock absorber is a double rod type. In the drawing, a sub cylinder body 11 having the same diameter as the cylinder body 1 is provided at the lower end side in the drawing. Are connected in a coaxial manner, and the tip end side which is the lower end side in the drawing of the other rod body 32 is made conductive in the sub cylinder body 11 so that the lower end side of the other rod body 32 interferes with a so-called other part. The sub-cylinder body 11 has a bracket 12 that allows the hydraulic shock absorber to be attached.

  The piston body 2 itself is a damping valve that allows communication between both oil chambers R1 and R2 defined in the cylinder body 1, that is, a damping valve 21 that is used for the expansion side, and a damping valve that is used for the compression side. The valve 22 is arranged in parallel.

  At this time, the damping valves 21 and 22 are set so as to open when the upstream pressure exceeds the cracking pressure, and the cracking pressure is arbitrarily set.

  The rod body 3 has a bracket 33 at the tip of one of the rod bodies 31 that is upper in the drawing, and the bracket 33 can be used to connect to the stationary side B of the hydraulic shock absorber.

  Therefore, in this hydraulic shock absorber, attachment to a desired location using the brackets 12 and 33, that is, installation is possible, and operation at the installation location, that is, so-called expansion and contraction. Operation is enabled.

  In this hydraulic shock absorber, if a bypass path, which will be described later, is ignored, assuming that the piston body 2 rises in the cylinder body 1 in the drawing, for example, when the expansion side is operating, one oil chamber R1 communicates with the other oil chamber R2 via the damping valve 21. At this time, a damping force having a predetermined magnitude is generated by the damping valve 21.

  Similarly, in this hydraulic shock absorber, assuming that the piston body 2 descends in the drawing in the cylinder body 1 in the drawing, for example, when operating on the pressure side, the other oil chamber R2 is connected via the damping valve 22 to one side. At this time, a damping force of a predetermined magnitude is generated by the damping valve 22.

  On the other hand, in the present invention, the valve device includes a bypass path that allows communication between the oil chambers R1 and R2 of the hydraulic shock absorber outside the cylinder body 1, and a bypass path that is disposed in the bypass path and that generates thrust from the outside. It has a spool 4 that slides upon input to open the bypass passage, check valves 6 and 7 that rectify the flow of hydraulic oil in the bypass passage, and input means 8 that inputs thrust to the spool 4.

  First, the bypass path is formed in a valve housing 5 integrally connected to the cylinder body 1, so-called both ends are so-called in the oil chambers R 1, R 2 with respect to the oil chambers R 1, R 2 in the cylinder body 1. Communicates at the stroke end region.

  That is, when the piston body 2 slides in the cylinder body 1 with a large stroke exceeding a so-called neutral region and reaches the vicinity of the end of the cylinder body 1, the cylinder body 1 is opened. The opened opening is not blocked, and the communication of the oil chambers R1, R2 to the bypass path is not hindered.

  At this time, in view of the original function of the bypass passage, the valve housing 5 is integrally connected to the cylinder body 1 regardless of whether the bypass passage is formed in the valve housing 5. In the valve device, it is preferable.

  That is, as will be described later, in the valve device of the present invention, the spool 4 disposed in the bypass passage is opened via the input means 8 but is opened depending on the expansion / contraction position of the hydraulic shock absorber. Since at least the valve housing 5 having the spool 4 is required to operate, this may be imitated by a part of the cylinder body 1, and from this viewpoint, the valve housing 5 is It is preferable that the cylinder body 1 is integrally provided and held by the cylinder body 1.

  By the way, the bypass path formed in the valve housing 5 communicates with one communication path 51 communicating with one oil chamber R1, the other communication path 52 communicating with the other oil chamber R2, and one communication path 51. And the other chamber 54 communicating with the other communication passage 52, and a pair of land portions 55, 56 that define the two chambers 53, 54. An annular groove 57 and a communication path 58 that communicates with both the above-described communication paths 51 and 52 and communicates with the annular groove 57, and check valves 6 and 7 are disposed in the communication path 58.

  At this time, the end of the notch portion 42 of the spool 4 to the end of the land portion 56 (from the end of the notch portion 42 of the spool 4 to the end of the chamber 54) is the same as a dead zone stroke L1, which will be described later. The end zone to the end of the land portion 55 (from the end of the notch portion 42 of the spool 4 to the end of the chamber 53) is the same as a dead zone stroke L2 to be described later. Therefore, although the annular groove 57 is not shown, The bypass path is opened when the cutout portion 42 crosses 55 and 56.

  As for the check valves 6 and 7, as shown in the drawing, the hydraulic oil from one oil chamber R1 passes through the communication path 58 serving as a bypass path when the hydraulic shock absorber is extended when the bypass path is closed. The check valve 6 prevents the oil from flowing into the other oil chamber R2.

  Contrary to the above, when the hydraulic shock absorber is contracted when the bypass passage is in the closed state, the hydraulic oil from the other oil chamber R2 flows into one oil chamber R1 through the communication passage 58 serving as the bypass passage. The check valve 7 prevents this.

  In addition, when the bypass passage is in an open state, it is checked that the hydraulic oil from the oil chamber R1 flows into the oil chamber R2 through the container chamber 53, the annular groove 57 and the communication passage 58 when the hydraulic shock absorber is extended. The valve 7 allows, and the check valve 6 allows the hydraulic oil from the oil chamber R2 to flow into the oil chamber R1 via the capacity chamber 54, the annular groove 57 and the communication path 58 when the hydraulic shock absorber is contracted.

  Further, for example, when the hydraulic shock absorber that has been extended is reversed to the contraction operation and the spool 4 returns to the so-called return, the hydraulic oil from the oil chamber R2 is said to pass through a bypass path that is not yet closed. The check valve 7 blocks the flow into the oil chamber R1, and only the damping valve 22 of the piston body 2 in the hydraulic shock absorber operates to generate a damping force having a predetermined magnitude.

  Contrary to the above, when the hydraulic shock absorber that has been contracted is reversed to the expansion operation and the spool 4 returns to the so-called return, the hydraulic oil from the oil chamber R1 is said to be in a bypass path that is not yet closed. The check valve 6 prevents the oil from flowing into the oil chamber R2 through the valve, and only the damping valve 21 of the piston body 2 in the hydraulic shock absorber operates to generate a damping force having a predetermined magnitude.

  From the above, according to the present invention, the level of the damping force generated by the hydraulic shock absorber can be adjusted by opening and closing the bypass path with the spool 4. 7 also provides a displacement characteristic of the damping force as shown in FIG.

  Next, as shown in the figure, the spool 4 has a notch 42 at the center of the main body 41 positioned in the valve housing 5 in a so-called neutral state in which the bypass path is maintained in the closed state shown in the figure.

  At this time, the notch 42 entirely faces the annular groove 57 in the valve housing 5 forming the bypass passage, but does not partially face the land portions 55 and 56, and the land portion 55, In FIG. 56, the width length is made larger than the width length in the vertical direction.

  Therefore, when the spool 4 slides in the axial direction, which is the vertical direction in the drawing, and the cutout portion 42 is in a state of straddling the land portions 55 and 56, The communication with the annular groove 57 or the communication between the other chamber 54 and the annular groove 57 is allowed.

  And this spool 4 has the other stopper part 44 which makes the effective stroke V2 of the spool 4 appear between one end part of the main-body part 41 used as a lower end part in the figure between the valve housing 5, and the upper end in the figure. One stopper portion 43 for allowing the effective stroke V1 of the spool 4 to appear between the valve housing 5 and the other end side of the main body portion 41 on the side.

  On the other hand, in the valve device of the present invention, the input means 8 is provided on the spool 4, that is, the spool 4 is slid following the sliding of the piston body 2 in the cylinder body 1 of the hydraulic shock absorber. Input means 8 for inputting thrust is connected.

  The input means 8 includes, as shown, a cylinder 81, a moving body 82 that is accommodated in the cylinder 81 and moves in the axial direction of the spool 4 in the vertical direction in the figure, And a pair of balance springs 83 and 84 to which an initial load for sandwiching the moving body 82 is applied from the axial direction of the spool 4 which is housed in the body 81 and is in the vertical direction in the drawing.

  Incidentally, the moving body 82 in the input means 8 is formed at the other end portion as the upper end portion in the drawing of the spool 4 as shown in the drawing, but instead of this, although not shown, Therefore, it may be connected to one stopper portion 43 of the spool 4 during so-called assembly.

  On the other hand, in the input means 8, the upper end of the cylinder 81 is connected to the fixed side B via the adjustment shaft 85 under the distribution of the lock nut 85 a.

  Here, the operation of the valve device according to the present invention will be described. First, in the state shown in FIG. 1, in the hydraulic shock absorber, the piston body 2 in the cylinder body 1 is in the neutral position, and the spool 4 is neutral in the valve housing 5. Is in a state.

  At this time, since the spring force of the balance springs 83 and 84 is balanced in the input means, the effective stroke V1 of the spool 4 that appears between one stopper portion 43 of the spool 4 and the valve housing 5, and the spool 4, the effective stroke V2 of the spool 4 that appears between the other stopper portion 44 and the valve housing 5 is the same.

  Incidentally, when there is a difference between the dead zone stroke L1 and the dead zone stroke L2, this can be made the same by adjusting the screwing amount of the adjustment shaft 85 to the fixed side B in the input means 8.

  From this state, for example, in the hydraulic shock absorber, assuming that the piston body 2 ascends in the cylinder body 1 in the drawing is an extension operation, when the hydraulic shock absorber is extended, the initial load is applied to the balance springs 83 and 84. Since the load (which can overcome the frictional force in the spool 4) is applied, there is no change in the input means 8. Therefore, the spool 4 protrudes from the valve housing 5 so as to rise in the figure. Until the movement stroke becomes equal to or greater than the dead zone stroke L2, the spool 4 does not open, so that the bypass path is closed. Therefore, in the hydraulic shock absorber, one oil chamber R1 has the damping valve 21 closed. To the other oil chamber R2.

  When the movement stroke of the spool 4 becomes equal to or greater than the dead zone stroke L2, the cutout portion 42 formed in the main body portion 41 of the spool 4 straddles the upper land portion 55 in the drawing and forms one bypass chamber 53 that forms a bypass path. Is communicated with the annular groove 57, and the bypass path is opened in the valve housing 5.

  Therefore, in the hydraulic shock absorber, one of the oil chambers R1 is connected through the opened bypass passage, that is, one communication passage 51, one container chamber 53, the annular groove 57, the check valve 7, and the other. As long as it communicates with the other oil chamber R <b> 2 through the communication passage 52, the high damping force that has been generated so far is reduced.

  When the extension operation is continued in the hydraulic shock absorber and the spool 4 continues to rise, the rise of the spool 4 is blocked by the contact of the other stopper portion 44 with the valve housing 5. Instead, the movement is absorbed by the input means 8.

  That is, in the input means 8, the moving body 82 accommodated in the cylinder 81 descends in the cylinder 81 so as to contract the balance spring 84 in the lower part in the figure, and the hydraulic shock absorber The external force accompanying the extension operation at, that is, the input of thrust to the spool 4 is avoided.

  In contrast to the above, in the neutral hydraulic shock absorber, assuming that the piston body 2 descends in the cylinder body 1 in the drawing is a contraction operation, when the hydraulic shock absorber contracts, the spool 4 Since the spool 4 does not open until the moving stroke of the spool 4 becomes equal to or greater than the dead zone stroke L1, the bypass path is closed. Therefore, in the hydraulic shock absorber, the other oil chamber R2 communicates with one oil chamber R1 via the damping valve 22.

  When the moving stroke of the spool 4 becomes equal to or greater than the dead zone stroke L1, the notch portion 42 formed in the main body portion 41 of the spool 4 straddles the land portion 56 which is the lower side in the drawing, and forms the other bypass chamber 54. Is communicated with the annular groove 57, and the bypass path is opened in the valve housing 5.

  Therefore, in the hydraulic shock absorber, the other oil chamber R2 is connected to the other communication passage 52, the other chamber 54, the annular groove 57, the check valve 6 and the one through the opened bypass passage. In this way, the high damping force generated until then is reduced.

  When the contraction operation is continued in the hydraulic shock absorber and the lowering of the spool 4 is continued, the lowering of the spool 4 is prevented by the contact of the one stopper portion 43 with the valve housing 5. Instead, the movement is absorbed by the input means 8.

  That is, in the input means 8, the movable body 82 housed in the cylinder 81 is raised in the cylinder 81 so as to contract the balance spring 83 located in the upper part in the figure, and the hydraulic shock absorber The external force accompanying the contraction operation at the time, that is, the input of thrust to the spool 4 is avoided.

  As described above, in the valve device of the present invention, when the expansion / contraction amount exceeds the dead zone strokes L1 and L2 during the expansion / contraction operation in which the rod body 3 protrudes and retracts with respect to the cylinder body 1, the spool is formed in the valve housing. 4 opens and switches the bypass to an open state.

  Therefore, from this, in the valve device of the present invention, when the dead zone strokes L1, L2 are the same, it can be estimated that the hydraulic shock absorber is in a so-called neutral state.

  That is, when the hydraulic shock absorber is installed at an arbitrary place, so-called installation intervals at the installation location vary, and therefore, in the hydraulic shock absorber, the piston body 2 is positioned at the complete central portion in the cylinder body 1. Even if it is difficult to determine, that is, to make the neutral state practically, the so-called neutral state of the piston body 2 with respect to the cylinder body 1 can be manifested by making the dead zone strokes L1 and L2 the same.

  At this time, even if the piston body 2 is not in a completely neutral state in the cylinder body 1, in most cases, the deviation does not become unnecessarily large even if it is larger than the so-called tolerance. By making L2 the same, there is no problem even if it is assumed that the hydraulic shock absorber is in a neutral state.

  In view of the above, in the present invention, when installing the hydraulic shock absorber, the neutral state in the valve device can be seen with certainty, and a conventional hydraulic shock absorber of the kind is installed. Therefore, the so-called neutral state is not easily displayed, and therefore, quick installation work can be realized as compared with the case where labor is required to install the hydraulic shock absorber.

  In the valve device of the present invention, the spool 4 is opened by the operation of the input means 8, but the operation of the input means 8 is regarded as important. In the requested scene, after the request disappears, the involvement of the input means 8 is stopped.

  That is, in the illustrated spool 4, for example, in a case where the bypass path is opened by moving 30 m / m, the subsequent movement of the spool 4 is meaningless.

  Therefore, the input means 8 inputs the thrust until the spool 4 moves the set amount, but thereafter, the thrust is not input via the input means 8 and the spool 4 is not operated.

  Specifically, in the illustrated case, when the spool 4 moves a certain amount, further movement is mechanically blocked by the contact of the stopper portions 43 and 44 held by the spool 4 with the valve housing 5.

  Therefore, in the input means 8 in the valve device of the present invention, since the thrust more than necessary is not input to the spool 4 that has been mechanically stopped, the valve device does not force the spool 4 so-called. It becomes easy to guarantee the operability in the case permanently.

  Further, in the valve device of the present invention, it is sufficient that the opening operation stroke in the spool 4, that is, the effective stroke is ensured, so that the spool 4 can be made compact, that is, the valve device can be made compact.

  In the above description, it is assumed that the so-called avoidance of the input means 8 is based on the stroke end in the spool 4. However, as long as the effective stroke in the spool 4 is ensured, the spool 4 is disposed in the valve housing 5, for example, It may be in contact with the land portions 55 and 56.

  In the above description, the case where the hydraulic shock absorber equipped with the valve device according to the present invention is used as a vibration damper in a building is taken as an example. For example, it may be used for vibration control of railway vehicles and equipment other than objects.

  In the above description, the present invention is embodied in a double rod type hydraulic shock absorber. However, from the point of view of the present invention, the present invention is embodied in a single rod type hydraulic shock absorber. In addition, a buffer that uses a fluid other than gas, which is a so-called non-shrinkable fluid, can be realized.

  Further, in the above description, the hydraulic shock absorber equipped with the valve device according to the present invention has been described as an example in which the valve housing 5 is integrally held by the cylinder body 1. Even if the valve housing 5 is separated from the cylinder body 1, a neutral state in the hydraulic shock absorber can be realized.

  That is, regarding the installation of the hydraulic shock absorber at a predetermined position, the cylinder body 1 is first installed at the installation site in a state where it can be said that the cylinder body 1 is roughly viewed and is in a neutral state, and is separated from the cylinder body 1 after the dredging. If the valve housing 5 is moved and the dead zone strokes L1 and L2 are the same on the left and right sides, a neutral state in the hydraulic shock absorber can be realized.

It is a principle figure showing a hydraulic shock absorber provided with a valve device by one embodiment of this invention. It is a figure which shows the displacement characteristic of the damping force by the damping valve which a piston body has.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Piston body 3 Rod body 4 Spool 5 Valve housing 6, 7 Check valve 8 Input means 21, 22 Damping valve 31 One rod body 32 The other rod body 41 Main body part 42 Notch part 43 One stopper part 44 The other 51 One communication passage 52 One other communication passage 53 One container chamber 54 One other chamber 55, 56 Land portion 57 Annular groove 58 Communication passage 81 Cylindrical body 82 Moving body 83, 84 which is the other end portion Balance spring B Fixed side L1, L2 Dead band stroke R1, R2 Oil chamber V1, V2 Effective stroke of spool

Claims (6)

In the hydraulic shock absorber, a bypass passage that allows communication between the one and the other oil chamber defined by the piston body inside the cylinder body outside the cylinder body and a valve housing that forms this bypass passage is slidable A spool that is disposed and slides when an external thrust is input to enable opening in one of the bypass paths and the other selected direction, and an input means for inputting the thrust to the spool; In the valve device, the input means follows the sliding of the piston body in the cylinder body in the hydraulic shock absorber and inputs the thrust to the spool and stops the input of further thrust to the spool having the bypass path opened. The spool has one stopper at the other end and the other stopper that makes the effective stroke of the spool appear between the valve housing and the other end. One end of the spool has an effective stroke of the spool between the valve housing and the other end is connected to the fixed body for connecting the rod body or the rod body in the hydraulic shock absorber under the presence of the input means. The input means is disposed coaxially with the spool, and the other end of the spool is present in the cylinder connected to the fixed side, and the other end is sandwiched between a pair of balance springs housed in the cylinder. A valve device characterized by being made to do. The hydraulic shock absorber has a damping valve that allows the oil body to communicate with the piston body slidable within the cylinder body, and the base end is connected to the piston body so that the cross-sectional area is the same while both oil 2. The valve device according to claim 1, further comprising both one and the other rod bodies that are inserted through the shaft core portion of the chamber and project the tip out of the cylinder body. One communication path in which the bypass path communicates with one oil chamber, the other communication path in communication with the other oil chamber, one container chamber in communication with one communication path, and the other in communication with the other communication path A communication chamber that communicates with the annular groove while communicating with the one communication path and the other communication path, and the annular groove formed between the pair of land portions that define the two chambers. The valve device according to claim 1 or 2, comprising a passage, wherein a check valve is disposed in the communication passage. 4. The valve device according to claim 1, wherein the spool is formed at a central portion of a main body portion positioned in the valve housing, and has a notch portion that opens and closes the bypass passage when the spool is slid. The valve device according to claim 1, 2, 3, or 4, wherein the input means can adjust the length of the shaft relative to the fixed side. 6. The valve device according to claim 1, wherein the bypass passage is closed by a spool when the piston body is located near the center of the cylinder in the hydraulic shock absorber. .

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