JP2009097593A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow exertion of a prescribed damping function depending on an expansion/contraction position while improving installation performance. <P>SOLUTION: A control valve 5, 6 closes a bypass path by receiving a spring force of a valve-body biasing spring 54, 64 and opens the bypass path by receiving input of thrust surpassing the spring force of the valve-body biasing spring 54, 64. An input means 9 has an input regulating mechanism 10 facing a tip of a tip part, protruding from a valve mount 4, of the control valve 5, 6 while being held by a rod body 3 whose base end is connected to a piston body 2 in a hydraulic shock absorber and whose tip is protruded outside a cylinder body 1. The input regulating mechanism 10 has a push member 101, which faces the tip of the tip part, protruding from the valve mount 4, of the control valve 5, 6, and a biasing means 102 that is arranged at the rear side of the push member 101 so as to allow the push member 101 to retreat while allowing the push member 101 to advance toward the control valve 5, 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 mount connected to the cylinder body and a spool as a control valve slidably accommodated in the valve mount.

  Further, the valve mount 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 projected and retracted with respect to the cylinder body. .

  In addition, 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 mount, 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 mount.

  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 makes it 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 basically includes a bypass passage that allows both oil chambers defined by the piston body to communicate with each other outside the cylinder body in the cylinder body of the hydraulic shock absorber. A control valve disposed on a valve mount that forms the bypass path, and capable of opening and closing in one direction and the other direction in the bypass path; and an input means for inputting a thrust to the control valve to open the control valve. The input means opens the control valve when the piston body slides in the cylinder body in the hydraulic shock absorber to open the bypass path, and at the same time, allows the control valve that has opened the bypass path to be further stopped. In the apparatus, the control valve receives the spring force of the valve body biasing spring to close the bypass passage and is superior to the spring force of the valve body biasing spring. Upon receiving the force input, the bypass path is opened, and the input means projects from the valve mount of the control valve while being held by the rod body whose base end is connected to the piston body of the hydraulic shock absorber and the tip of the cylinder is projected outside the cylinder body. An input restricting mechanism that faces the tip of the tip, and the input restricting mechanism is disposed on the back side of the push member, the push member facing the tip of the tip protruding from the valve mount in the control valve; Suppose that it has a biasing means for allowing the push member to move backward while moving the push member forward toward the control valve.

  Therefore, in the present invention, the input means for inputting the thrust for operating the control valve disposed in the bypass passage that enables communication between both oil chambers in the hydraulic shock absorber outside the cylinder body is provided in the cylinder body. Since the control valve is actuated when the piston body slides to open the bypass passage, the operation of the control valve that has opened the bypass passage can be further stopped by the actuation, so that the hydraulic pressure buffer to which the input means is connected Even if the so-called expansion / contraction stroke in the vessel exceeds the operation stroke in the control valve, that is, the effective stroke, the input means does not input a thrust force for further operating the control valve.

  As a result, the effective stroke, which is the operation stroke of the control valve, can be set independently of the expansion / contraction stroke of the hydraulic shock absorber, and the operation stroke of the control valve only needs to be slightly increased in consideration of the so-called safety factor. When the valve is provided on a valve mount connected to the cylinder body, the valve mount 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 both the oil chambers that form a pair 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 an 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 input from the input means to the control valve, the bypass path is opened and both oil chambers in the cylinder body are opened. It is communicated via.

  As a result, the damping valve of the piston body that was maintained in a high damping force generation state until the bypass passage was opened by the operation of the control valve is the same as that until the bypass passage was opened by the operation of the control valve. The generated damping force is reduced.

  Then, the piston body reverses in the cylinder body and shifts to the reverse stroke. Therefore, when the control valve cancels its operation, the bypass path is closed and a high damping force is generated by the damping valve of the piston body. Is done.

  In the valve device of the present invention, the input restricting mechanism in the input means that enables further stop of the opening operation for the control valve that opens the bypass passage is formed on the input means side, that is, on the hydraulic shock absorber side. Therefore, the configuration of the control valve can be freely set, and as long as it is used, the applicability in this valve device is increased.

  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 the figure is a cylinder body 1 and both oil chambers that are paired so as to have the same cross-sectional area in the cylinder body 1 while being slidably received in the cylinder body 1. That is, the 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 each oil chamber while its base end is connected to the piston body 2 The rod body 3 that is inserted through the shaft cores of R1 and R2 and projects the tip from the closed end of the cylinder body 1 to the outside, that is, the one rod body 31 that is the upper side in the drawing with the same cross-sectional area. It has the other rod body 32 which becomes the inside downward.

  In this hydraulic shock absorber, the piston body 2 has damping valves 21 and 22 that allow communication between both the oil chambers R1 and R2, and the cylinder body 1 includes control valves 5 and 6 described later. The valve mount 4 that enables the arrangement of the valve body 4 is integrally connected, and the valve mount 4 has a plate portion 41 that is connected to the cylinder body 1 while having only a port (not shown). And a housing part 42 connected to the plate part 41 and having control valves 5 and 6 and check valves 7 and 8.

  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, the cylinder body 1 has a sub-cylinder body having the same diameter as the cylinder body 1 at the lower end side in the drawing. 11 is connected coaxially, the tip end side which is the lower end side in the figure of the other rod body 32 is made conductive in the sub-cylinder body 11, and 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 enables the so-called attachment of the hydraulic shock absorber.

  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 be opened 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 hydraulic shock absorber can be attached using the bracket 33.

  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.

  Next, in this hydraulic shock absorber, a bypass path (not shown) that bypasses the damping valves 21 and 22 provided in the piston body 2 and communicates both the oil chambers R1 and R2 outside the cylinder body 1. have.

  At this time, the so-called both ends of the bypass path communicate with the oil chambers R1 and R2 in the cylinder body 1 at portions serving as so-called stroke end regions in the oil chambers R1 and R2.

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

  On the other hand, in the present invention, the valve device is disposed in a passage communicating between the high pressure side and the low pressure side, that is, the two oil chambers R1 and R2 are communicated outside the cylinder body 1. Control valves 5 and 6 that are disposed in the bypass path that allow movement by the input of thrust from the outside to open the bypass path, and the flow of hydraulic oil in the bypass path with respect to the control valves 5 and 6 Check valves 7 and 8, and input means 9 for inputting thrust to the control valves 5 and 6.

  First, the bypass passage is formed in the valve mount 4 integrally connected to the cylinder body 1, that is, in the illustrated case, in the plate portion 41 and the housing portion 42. Control valves 5 and 6 arranged in parallel so as to allow communication in opposite directions between the oil chambers R1 and R2, and a check valve 7 for controlling the flow direction of hydraulic oil in the bypass passage, that is, for rectifying , 8.

  At this time, in view of the original function of the bypass path, it is the valve device according to the present invention that the valve mount 4 is held by the cylinder body 1 regardless of whether or not the valve mount 4 is formed. That is preferable.

  That is, as will be described later, in the valve device of the present invention, the control valves 5 and 6 arranged in the bypass passage are opened and closed via the input means 9 but depending on the expansion / contraction position of the hydraulic shock absorber. Since it is required to operate, at least in the valve mount 4 having the control valves 5 and 6, this may be simulated by a part of the cylinder body 1. Therefore, from this viewpoint, the valve mount 4 is preferably integrally connected to the cylinder body 1 and held by the cylinder body 1.

  Next, the control valves 5 and 6 are operated so as to be opened by an input from the input means 9 following the protrusions and depressions of the rod body 3 with respect to the cylinder body 1 in the hydraulic shock absorber. Communicate with the oil chamber.

  That is, for example, in the control valve 5, when the hydraulic shock absorber in which one rod body 31 is immersed in the cylinder body 1 is switched to the open state by the input from the input means 9 and the other oil chamber R2 is switched. Is communicated with one of the oil chambers R1 through the opened control valve 5, and at this time, the control valve 6 is maintained in the shut-off state in its own state with the intervening check valve 7. Close the bypass.

  Even in the control valve 6, when one rod body 31 protrudes from the cylinder body 1, it is switched to the open state by the input from the input means 9 during the extension side operation, and one oil chamber R 1 is opened. The control valve 5 communicates with the other oil chamber R2 via the control valve 6, and at this time, the control valve 5 is maintained in the shut-off state in its own state, with the presence of the check valve 8 as described above, To that extent, the bypass is closed.

  As for check valves 7 and 8, as described above, for example, when the control valve 5 is opened by the pressure side operation of the hydraulic shock absorber, it is checked that the hydraulic oil in the oil chamber R2 flows into the control valve 6. 7, when the control valve 5 returns to the so-called return direction, that is, the hydraulic oil flowing out from the oil chamber R1 is not yet shut off because the hydraulic shock absorber is reversed to the extension side operation. The check valve 8 functions to prevent this and maintain the control valve 5 in a predetermined closed state when it enters a situation where it flows into the engine, and only the damping valve 21 is operated in the hydraulic shock absorber so as to have a predetermined size. A damping force is generated.

  Then, the check valve 8 prevents the hydraulic oil in the oil chamber R1 from flowing into the control valve 5 when the control valve 6 is opened by the extension side operation of the hydraulic shock absorber, and the control valve 6 returns so-called. In other words, when the hydraulic shock absorber reverses to the pressure side operation, the check valve 7 prevents this when the hydraulic oil flowing out from the oil chamber R2 flows into the control valve 6 that is not yet shut off. Thus, while functioning to maintain the control valve 6 in a predetermined closed state, only the damping valve 22 operates in the hydraulic shock absorber 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 by the control valves 5 and 6. With the cooperation of the valves 7 and 8, the displacement characteristic of the damping force as shown in FIG. 2 is obtained.

  Here, the control valves 5 and 6 include input shafts 51 and 61, valve bodies 52 and 62, base shafts 53 and 63, and valve body biasing springs 54 and 64 that are accommodated in the housing portion 42 of the valve mount 4. It has.

  The input shafts 51 and 61 are configured to input the thrust from the input means 9 facing each other to the distal ends that are the upper and lower ends in the figure protruding outward from the housing portion 42. Consists of spools with the same direction.

  The input shafts 51 and 61 have their tip portions that face the input means 9 projecting outside the housing portion 42 and are placed in the atmosphere. It may be possible to adjust the distance to the input means 9, that is, to adjust the lengths of the dead zone strokes L1 and L2 described later.

  In addition, in the place shown in the figure, the input shafts 51 and 61 have one or a plurality of kerfs 51a and 61a as oil passages that realize flow rate control according to displacement in front of valve bodies 52 and 62, which will be described later. The book is formed.

  Next, the valve bodies 52 and 62 are connected in series to the base ends of the input shafts 51 and 61, that is, in the illustrated case, the valve bodies 52 and 62 are integrally connected to each other so that the bypass passages are opened when the input shafts 51 and 61 are retracted. As shown in the figure, it is made of a poppet. Therefore, compared with the case where the valve bodies 52 and 62 are made of a spool, the leakage of hydraulic oil in the bypass passage is effectively prevented.

  And since the said groove 51a, 61a is formed in the upstream of the poppet which is the valve bodies 52, 62, according to a stroke by using the flow of the hydraulic oil through this groove 51a, 61a. 2 can be controlled, for example, the waveform in the region indicated by the symbol X in the characteristic diagram of FIG. 2 can be controlled, and the valve bodies 52 and 62 can be suddenly opened and closed even when control of this waveform is not required. There is no so-called shock can be alleviated.

  In addition, about said valve body 52,62, this may consist of a spool, and when it consists of a spool, it is good also as making a poppet in series with this.

  The base shafts 53 and 63 are connected in series to the valve bodies 52 and 62, that is, in the drawing, the shaft diameters are the same as the input shafts 51 and 61 while being integrally connected to the rear ends of the valve bodies 52 and 62. The rear end communicates with the atmosphere.

  Therefore, in this valve device, the rear ends of the base shafts 53 and 63 communicate with the atmosphere, while the tips of the input shafts 51 and 61 having the same diameter are also placed in the atmosphere. The forward movement state is maintained only by the spring force of the valve body urging springs 54 and 64 described later, that is, the bypass passage is closed.

  In addition, the valve body biasing springs 54 and 64 are made of coil springs housed in a chamber portion (not shown) formed in the housing portion 42 as shown in the figure. So long as the biasing force in the springs 54 and 64 is not extremely large, so-called identity is not required.

  In the valve body biasing springs 54 and 64, when the thrust from the input means 9 is input, the valve body biasing springs 54 and 64 contract to allow the base shafts 53 and 63 to retreat, that is, the valve bodies 52 and 62 to retreat. Thus, the flow of hydraulic oil in the bypass passage through the valve bodies 52 and 62 is allowed.

  By the way, as for the spring force of the valve body biasing springs 54 and 64, as described above, in the control valves 5 and 6 of the present invention, the input that sandwiches the poppets that are the valve bodies 52 and 62. So-called axial forces between the shafts 51 and 61 and the base shafts 53 and 63 are the same.

  Therefore, when the valve bodies 52 and 62 are seated on a so-called valve seat portion and the bypass passage is maintained in a closed state, the valve body attached with a valve body having a spring force superior to the friction when the control valves 5 and 6 are operated. Therefore, when the valve body urging springs 54 and 64 are coil springs, a so-called light coil spring is sufficient.

  On the other hand, the input means 9 is basically formed so as to synchronize with the movement of the rod body 3 described above, and is connected to the one rod body 31 located upward in the drawing. It has an arm member 91, a joint 92 formed so as to be adjustable in length while being connected to the arm member 91, and an input main body 93 connected to the joint 92.

  At this time, the arm member 91 extends in a direction crossing the one rod body 31, and the joint 92 is directed downward from the front end of the arm member 91 in the drawing, that is, in the valve mount 4. The input main body 93 is connected to the lower end of the joint 92 and is close to the body posture so as to surround the housing 42 in the valve mount 4.

  In other words, the input main body 93 has the control valves 5 and 6 projecting the input shafts 51 and 61 in the axial direction of the rod body 3 in the directions opposite to each other. 42, since it protrudes from the upper and lower ends of the input shafts 51, 61, the input portions 93a, 93b are formed so as to have so-called lateral U-shapes.

  The input parts 93a and 93b are opposed to the tips of the input shafts 51 and 61 while having dead zone strokes L1 and L2 between the tips of the input shafts 51 and 61 of the control valves 5 and 6, respectively.

  Therefore, in this input means 9, for example, when one rod body 31 is immersed in the cylinder body 1, until the rod body 31 is immersed in the cylinder body 1 more than the dead zone stroke L1 described above. The input portion 93a does not interfere with the tip of the input shaft 51 in the control valve 5, and therefore the control valve 5 does not open.

  When the stroke in which the rod body 31 is immersed in the cylinder body 1 is equal to or greater than the dead zone stroke L1, the input portion 93a causes the input shaft 51 in the control valve 5 to be immersed in the housing portion 42 in the valve mount 4, and therefore In the control valve 5, the poppet 52 is retreated against the spring force of the valve body biasing spring 54 so as to open.

  In the above operation, when the other rod body 32 is immersed in the cylinder body 1, the input portion 93 b on the opposite side in the input means 9 operates similarly to the input shaft 61 in the control valve 6. Therefore, the control valve 6 operates in the same manner as the control valve 5 described above.

  The input main body 93 has an adjustment portion 93c at a so-called intermediate portion, and can adjust the length of the above-described dead zone strokes L1, L2, that is, the interval appearing between the input means 9 and the control valves 5, 6. I have to.

  Next, in the input means 9, the input portions 93 a and 93 b have an input restriction mechanism 10 that faces the tips of the input shafts 51 and 61 in the control valves 5 and 6 while maintaining the dead zone strokes L 1 and L 2. ing.

  The input restricting mechanism 10 includes a push member 101 that faces the tips of the input shafts 51 and 61 in the control valves 5 and 6, and a biasing unit 102 that biases the push member 101 from the rear side. Become.

  At this time, the push member 101 opposes the leading ends of the input shafts 51 and 61 in the control valves 5 and 6 with dead zone strokes L1 and L2, and in this input restriction mechanism 10, the push member 101 is The slide rod 103 is connected to the rear shaft core portion, and the so-called rear end side of the slide rod 103 is connected to the input portions 93a and 93b so as to pass through the input portions 93a and 93b. .

  On the other hand, the urging means 102 is an urging spring comprising a coil spring, and is sandwiched between the push member 101 and the input portions 93a and 93b in a state of being interposed on the outer periphery of the slide rod 103. Yes.

  By the way, in this input restricting mechanism 10, the spring force of the urging spring as the urging means 102 is the spring force of the valve body urging springs 54 and 64 in the control valves 5 and 6 and the operation of the control valves 5 and 6. The combined force with the friction force at the time is better.

  Therefore, in this input means 9, when the push member 101 moves forward so as to come into contact with the input shafts 51, 52 of the control valves 5, 6, the input shafts 51, 61 are connected to the valve body biasing springs 54, 64. To overcome the resultant force of the spring force and the friction force when the control valves 5 and 6 are operated.

  At this time, since the push member 101 is urged by the urging spring as the urging means 102, the push member 101 apparently moves forward together with the input portions 93a and 93b, and is the same as the rod body 3. Become operational.

  Therefore, in this input restricting mechanism 10, for example, the push member 101 is brought into contact with the tips of the input shafts 51 and 61 in the control valves 5 and 6, and at this time, the movement in the control valves 5 and 6 is restricted. If it is, the biasing spring as the biasing means 102 is contracted and retracted.

  That is, when the control valves 5 and 6 are mechanically prevented from retreating the poppets 52 and 62, or the input shafts 51 and 61 are completely immersed in the housing portion 42 of the valve mount 4. Then, the backward movement of the input shafts 51 and 61 is stopped, so that the subsequent movement of the push member 101, that is, forward movement, is prevented, and the urging spring as the urging means 102 is contracted.

  Therefore, in the input means 9 in the present invention, when the rod body 3 is immersed in the cylinder body 1 in the hydraulic shock absorber, the control valves 5 and 6 are opened to open the bypass path, and the input means 9 In the input restricting mechanism 10 that constitutes 9, the input of thrust force that causes the control valves 5 and 6 that have opened the bypass to be further opened is stopped.

  That is, even after the operation stroke of the control valves 5 and 6 is stopped, when the push member 101 continues to be pressed against the housing portion 42, the push member 101 overcomes the spring force of the biasing spring as the biasing means 12. A situation of retreating appears, and at this time, the rod body 3 in the hydraulic shock absorber can be further expanded and contracted.

  Therefore, in the input means 9 formed as described above, for example, when one rod body 31 is immersed in the cylinder body 1, the rod body 31 is more than the dead zone stroke L1. The push member 101 in the input restricting mechanism 10 does not interfere with the tip of the input shaft 51 in the control valve 5 until it is immersed, and therefore the control valve 5 does not open.

  When the stroke in which one rod body 31 is immersed in the cylinder body 1 is equal to or greater than the dead zone stroke L1, the push member 101 in the input restriction mechanism 10 comes into contact with the tip of the input shaft 51 in the control valve 5, and this input The shaft 51 is immersed in the housing part 42 in the valve mount 4, so that the control valve 5 is opened.

  In the above operation, when the other rod body 32 is immersed in the cylinder body 1, the push member 101 on the opposite side in the input means 9 operates similarly to the input shaft 61 in the control valve 6. Therefore, the control valve 6 operates in the same manner as the control valve 5 described above.

  Although the urging spring as the urging means 102 is fixed at the initial load in the drawing, it may be formed so that the initial load can be adjusted instead.

  As described above, in the valve device of the present invention, when the expansion / contraction amount exceeds the above-described dead zone strokes L1 and L2 during the so-called expansion / contraction operation in which the rod body 3 protrudes and retracts with respect to the cylinder body 1, it is said that the corresponding control is performed. The valves 5 and 6 are opened to switch the bypass path to the communication state.

  Therefore, according to this, in the valve device of the present invention, when the dead zone strokes L1 and L2 are the same, 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 of the piston body 2 with respect to the cylinder body 1 is obtained by adjusting the dead zone strokes L1 and L2 to be the same. It becomes possible to reveal the state.

  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 will not be unnecessarily large, which will be larger than the so-called tolerance. Therefore, it can be said that there is no problem even if it is assumed that the hydraulic shock absorber is in a neutral state by adjusting the dead zone strokes L1 and L2 to be the same.

  In view of the above, according to the present invention, when installing the hydraulic shock absorber, it is possible to reliably show the neutral state in the valve device while visually confirming the state of the conventional hydraulic shock absorber. In the installation, the so-called neutral state is not easily displayed. Therefore, it is possible to realize a quick installation work as compared with the case where the installation of the hydraulic shock absorber is troublesome.

  In the valve device of the present invention, the control valves 5 and 6 are opened by the operation of the input means 9. The operation of the input means 9 is regarded as important by the opening operation of the control valves 5 and 6. Is requested, and after the request disappears, the involvement of the input means 9 is stopped.

  That is, in the control valves 5 and 6, for example, in the case where the bypass path is opened by moving 30 m / m, the subsequent movement of the control valves 5 and 6 is meaningless.

  Therefore, the input means 9 is involved until the control valves 5 and 6 move the set amount, but thereafter the input means 9 is not involved, that is, the thrust from the input hand means 9 is applied to the control valves 5 and 6. We are careful not to input it.

  Specifically, as shown in the figure, it is embodied by the input restricting mechanism 10, and further movement after the control valves 5 and 6 have moved a certain amount is energized by the energizing means 102 in the input mechanism 10. This is because the push member 101 is retracted due to the contraction of the spring.

  Therefore, the input means 9 in the valve device of the present invention does not input excessive thrust to the control valves 5 and 6 that have been mechanically stopped. It becomes easy to guarantee the operability in the valve device permanently.

  Further, in the valve device of the present invention, it is sufficient that the opening operation stroke of the control valves 5 and 6, that is, the effective stroke is guaranteed, so that the control valves 5 and 6 are made compact, that is, the valve device is compact. May be possible.

  In the above description, it is assumed that the so-called avoidance of the input means 9 is based on the stroke end of the control valves 5 and 6, but as long as the effective stroke of the control valves 5 and 6 is guaranteed, the control valves 5 and 6 are used. May be brought into contact with the valve mount 4.

  FIG. 3 shows a hydraulic shock absorber that embodies another embodiment of the valve device according to the present invention. Where the configuration is the same as that shown in FIG. In the following description, the description will be omitted unless it is necessary.

  In particular, the configuration of the hydraulic shock absorber, the valve mount 4, the valve mount 4 having the bypass path and the check valves 7 and 8, and the input means 9 are the same as in the embodiment of FIG. It is.

  On the other hand, in this embodiment, the control valve 20 disposed in the bypass path formed in the valve mount 4 is slid by the input of thrust from the outside by the input means 9 to open the bypass path. Consists of.

  First, the bypass path formed in the valve mount 4 communicates with one communication path 41 that communicates with one oil chamber R1, the other communication path 42 that communicates with the other oil chamber R2, and one communication path 41. And the other chamber 44 communicating with the other communication passage 42, and a pair of land portions 45, 46 that define the two chambers 43, 44. An annular groove 47 and a communication path 48 that communicates with both the above-described communication paths 41 and 42 and communicates with the annular groove 47, and check valves 7 and 8 are disposed in the communication path 48.

  The control valve 20 is composed of a spool that is retractably mounted on the valve mount 4 as shown in the figure. From the end of the kerf 202 formed at the center of the main body 201 to the end of the land 46 (the spool of the spool). (From the end of the groove 202 to the end of the chamber 44) is the same as the overlap L11, and from the end of the spool groove 202 to the end of the land 45 (from the end of the spool groove 202b to the end of the chamber 43) is over. Accordingly, the annular groove 47 is not shown in the figure, but opens the bypass when the land 202 and the groove 202 cross over so-called land.

  As for the check valves 7 and 8, as shown in the figure, the hydraulic oil from one oil chamber R1 passes through the communication passage 48 serving as a bypass passage when the hydraulic shock absorber is extended when the bypass passage is in a closed state. Thus, the check valve 7 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 48 serving as the bypass passage. The check valve 8 prevents this.

  In addition, when the bypass passage is in an open state, it is checked that hydraulic oil from the oil chamber R1 flows into the oil chamber R2 through the container chamber 43, the annular groove 47 and the communication passage 48 when the hydraulic shock absorber is extended. The valve 8 allows, and the check valve 7 allows the hydraulic oil from the oil chamber R2 to flow into the oil chamber R1 through the capacity chamber 44, the annular groove 47 and the communication path 48 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 returns to the so-called return, the hydraulic oil from the oil chamber R2 is oiled through a bypass path that is not yet closed. The check valve 8 prevents the flow into the chamber R1, and only the damping valve 22 of the piston body 2 in the hydraulic shock absorber operates to generate a predetermined magnitude of damping force.

  Contrary to the above, when the hydraulic shock absorber that has been contracted reverses to the expansion operation and the spool returns to the so-called return, the hydraulic oil from the oil chamber R1 is said to pass through a bypass path that is not yet closed. Thus, the check valve 7 prevents the oil from flowing into the oil chamber R2, and only the damping valve 21 of the piston body 2 in the hydraulic shock absorber operates to generate a predetermined magnitude of damping force.

  From the above, even in this embodiment, it is possible to adjust the level of the damping force generated by the hydraulic shock absorber by opening and closing the bypass path by the control valve 20. With the cooperation of the valves 7 and 8, the displacement characteristic of the damping force as shown in FIG. 2 is obtained.

  By the way, the spool that is the control valve 20 is one of the spools that cause the effective stroke V1 of the spool to appear under the distribution of the valve body biasing spring S between the valve mount 4 and one end of the main body 201 that is the upper end in the drawing. While having a stopper portion 203, the other end of the main body portion 201 which is the upper and lower end portions in the drawing is the other one that causes the effective stroke V2 of the spool to appear under the distribution of the valve body biasing spring S between the valve mount 4 and the other. A stopper 204 is provided.

  Incidentally, the valve body biasing spring S is a so-called balance spring which is a pair of upper and lower parts, and is illustrated as a coil spring, and as long as it is shown, the upper and lower parts have the same spring force.

  Therefore, in the spool which is the control valve 20, this slides in the axial direction which is the vertical direction in the figure, and the kerf 202 formed in the main body 201 crosses the land 45 or the land 46 so-called. When entering the state, as described above, the communication between the one chamber 43 and the annular groove 47 or the communication between the other chamber 44 and the annular groove 47 is allowed and the effective strokes V1 and V2 are moved. As a result, the stopper portions 203 and 204 abut against the valve mount 4 to prevent further movement.

  In addition, in the spool as the control valve 20 described above, both end portions, which are upper and lower ends in the drawing, can change the axial length, but this is set to a fixed type that makes it impossible to change the axial length. May be.

  By the way, the movement of the spool as the control valve 20 is realized by the input means 9 even in the illustrated embodiment, and this input means 9 is the one rod body 31 in the rod body 3. And one arm member 91 facing the upper end of the spool that is the control valve 20 and the other arm member 94 that is connected to the other rod body 32 of the rod body 3 and faces the lower end of the spool that is the control valve 20. The arm members 91 and 94 each have an input restricting mechanism 10 as a driving portion at a so-called tip portion.

  At this time, one arm member 91 is arranged outside the cylinder body 1, but the other arm member 94 is inserted through a slit-shaped opening 11 a formed in the sub-cylinder body 11, so to speak. The side protrudes outside the so-called sub-cylinder body 11.

  Therefore, in this hydraulic shock absorber, the other arm member 94 connected to the other rod body 32 passes through the slit-like opening 11a opened in the sub-cylinder body 11. A so-called rotation stop for the cylinder body 1 is embodied.

  Here, the operation of the valve device in FIG. 3 will be described. First, in the state shown in FIG. 3, the piston body 2 in the cylinder body 1 is in the neutral position in the hydraulic shock absorber, and the control valve 20 in the valve mount 4. The slack spool is in a neutral state.

  In this state, the spool has an effective stroke V1 that appears between the valve mount 4 and the one stopper portion 203 that protrudes outside the valve mount 4, and the other stopper portion 204 and the valve mount 4. The effective stroke V2 of the spool that appears is the same.

  Therefore, for example, when the hydraulic shock absorber is contracted, the spool is lowered so as to be immersed in the valve mount 4, and at this time, the spool is not moved until the moving stroke of the spool becomes a dead zone stroke L1 or more described later. Since the opening operation is not performed, the bypass passage is in a closed state. 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 becomes equal to or greater than the dead zone stroke L1, the cut groove 202 formed in the spool main body 201 straddles the land portion 46 which is the lower side in the figure, and the other chamber 44 forming the bypass path is annular. A state of communicating with the groove 47 is established, and the bypass path is opened in the valve mount 4.

  Therefore, in the hydraulic shock absorber, the other oil chamber R2 is connected to the other communication passage 42, the other container chamber 44, the annular groove 47, the check valve 7 and the one through the opened bypass passage. As long as it communicates with one of the oil chambers R1 through the communication passage 41, the high damping force that has been generated so far is reduced.

  Incidentally, when the one stopper portion 203 is lowered as the spool is lowered, the valve body biasing spring S interposed between the one stopper portion 203 and the valve mount 4 contracts.

  Then, when the contraction operation is continued in the hydraulic shock absorber and the lowering of the spool is continued, the lowering of the spool is prevented by the contact of the one stopper portion 203 with the valve mount 4, and thereafter The movement is absorbed by the input restriction mechanism 10 in the input means 9.

  In other words, in the input restricting mechanism 10, the biasing spring as the biasing means 102 contracts to retract the push member 101, thereby avoiding the external force accompanying the contraction operation in the hydraulic shock absorber, that is, the input of thrust to the spool. To do.

  In contrast to the above, when the hydraulic shock absorber is extended from a so-called neutral state, the spool rises so as to protrude from the valve mount 4, and at this time, the movement stroke of the spool is not less than a dead zone stroke L2 described later. In the hydraulic shock absorber, one of the oil chambers R1 is connected to the other oil chamber R2 via the damping valve 21. Communicate.

  When the moving stroke of the spool becomes equal to or greater than the dead zone stroke L2, the cut groove 202 formed in the spool main body 201 straddles the land portion 45 which is the upper side in the drawing, and one of the chambers 43 forming the bypass path is annular. A state of communicating with the groove 47 is established, and the bypass path is opened in the valve mount 4.

  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 8, 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.

  Then, when the expansion operation is continued in the hydraulic shock absorber and the situation where the spool continues to rise, when the rise of the spool is blocked by the contact of the other stopper portion 204 with the valve mount 4, The input restriction mechanism 10 in the input means 9 absorbs the movement.

  That is, in the input restricting mechanism 10, as described above, the urging spring serving as the urging means 102 contracts to retract the push member 101, and the external force accompanying the contraction operation in the hydraulic shock absorber, that is, the thrust spool. Avoid typing in.

  In the embodiment shown in FIG. 3, the dead zone stroke L <b> 1 (not shown) during the contraction operation is such that the overlap L <b> 11 and the push member 101 in the kerf 202 formed in the main body portion 201 of the spool shown in FIG. This is the sum of the gap L12 between the spools 201, and the dead zone stroke L2 (not shown) during the extension operation is also the gap L22 between the overlap L21 in the kerf 202, the push member 101, and the spool 201. And the sum.

  As described above, in the valve device of the present invention, when the expansion / contraction amount exceeds the dead zone strokes L1, L2 during the so-called expansion / contraction operation in which the rod body 3 protrudes and retracts with respect to the cylinder body 1, The control valve 20 opens and switches the bypass path to the communication state.

  Therefore, from this point of view, as in the case of the embodiment shown in FIG. 1, when the dead zone strokes L1 and L2 are the same, the hydraulic shock absorber is in a so-called neutral state. In addition, when installing a hydraulic shock absorber, a quick installation operation can be realized.

  In the valve device shown in FIG. 3, the spool as the control valve 20 is opened by the operation of the input means 9 as well as the valve device shown in FIG. The operation of 9 is regarded as important in a scene in which the opening operation of the spool is requested. After the request is removed, the participation of the input means 9 is stopped.

  Specifically, as shown in the drawing, when the spool moves a certain amount, further movement is mechanically prevented by contact of the stopper portions 203 and 204 held by the spool with the valve mount 4. .

  Therefore, even if the input means in the valve device of the present invention does not input an excessive thrust to the spool that has been mechanically stopped, the operability in the valve device is not imposed on the spool. It becomes easy to guarantee it permanently.

  Further, in the valve device of the present invention, it is sufficient to ensure the opening operation stroke in the spool, that is, the effective stroke, so that the spool 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 9 is based on the stroke end of the spool. However, as long as the effective stroke of the spool is ensured, the spool is within the valve mount 4, for example, the land portion 45. , 46 may be contacted.

  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. Furthermore, if it is a shock absorber using a fluid other than gas, which is a so-called non-shrinkable fluid, it can be realized.

  Further, in the above-described FIG. 1, the control valves 5 and 6 are arranged in parallel with the hydraulic shock absorber in the left-right direction in the figure to shorten the depth dimension, but this invention is intended. Therefore, although not shown, the parallel control valves 5 and 6 may be arranged so as to be overlapped with the hydraulic shock absorber so that the width dimension is narrowed.

  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 mount 4 is integrally held by the cylinder body 1. Even if the valve mount 4 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 mount 4 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.

  In the valve device according to the present invention, when the control valves 5 and 6 are embodied, the control valves 5 and 6 are not formed uniaxially but formed biaxially. Or, considering the case where it is installed in the cylinder body 1, it is easy to prevent the valve mount 4 from being miniaturized, or avoid the inconvenience that the equipment in the cylinder body 1 tends to be disadvantageous. This is advantageous in that it can be done.

  However, from the point of view of the present invention, although not shown, the control valves 5 and 6 may be embodied in a so-called uniaxial arrangement in series.

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. It is a figure which shows the hydraulic shock absorber provided with the valve apparatus by other Embodiment of this invention similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Piston body 3 Rod body 4 Valve mount 5,6,20 Control valve 9 Input means 10 Input control mechanism 21,22 Damping valve 41,42,48 Communication path 43,44 Chamber 45,46 Land part 47 Ring Groove 51, 61 Input shaft 52, 62 Valve body 53, 63 Base shaft 54, 64, S Valve body biasing spring 91, 94 Arm member 93 Input main body portion 93a, 93b Input portion 101 Push member 102 Biasing means 201 Main body portion 202 Groove 203, 204 Stopper R1, R2 Oil chamber

Claims (10)

In the hydraulic shock absorber, a bypass passage that communicates both the oil chambers defined by the piston body inside the cylinder body outside the cylinder body, and a valve mount that forms the bypass passage is arranged in one direction and the other direction in the bypass passage. There is a control valve that enables opening and closing, and input means that inputs a thrust to the control valve to open the control valve. The input means opens the control valve when the piston body slides in the cylinder body of the hydraulic shock absorber. In the valve device that allows the opening of the bypass path and further stop of the opening operation for the control valve that has opened the bypass path,
The control valve receives the spring force of the valve body biasing spring to close the bypass passage, receives the thrust force superior to the spring force of the valve body biasing spring, opens the bypass passage, and the input means is a piston in the hydraulic shock absorber. It has an input restriction mechanism that faces the tip of the tip of the control valve that protrudes from the valve mount while being held by a rod body that has a base end connected to the body and projects the tip out of the cylinder body. A push member facing the tip of the tip of the valve that protrudes from the valve mount, and an urging force that is disposed behind the push member and allows the push member to move backward while moving the push member forward toward the control valve. And a valve device. 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. 2. The valve device according to claim 1, wherein the input means is connected to a rod body having a base end connected to a piston body in the cylinder body of the hydraulic shock absorber and a tip projecting out of the cylinder body. The valve device according to claim 1, wherein a tip portion of the control valve facing the input means enables adjustment of the axial length. The valve device according to claim 1, wherein the bypass path is closed by a control valve when the piston body is located near the center of the cylinder in the hydraulic shock absorber. The biasing means in the input restriction mechanism is composed of a biasing spring, and the resultant force of the spring force of the valve body biasing spring that biases the control valve by the spring force of this biasing spring and the friction force when the control valve is operated The valve device according to claim 1, wherein While the control valve is held in the valve mount so as to be able to move in and out, the tip of the tip protruding from the valve mount is opposed to the input means, and the input shaft thrusts from the input means and retracts, and the base of the input shaft A valve body that is connected to the end and opens the bypass when retreating, a base shaft that defines a chamber that is connected to the valve body and communicates with the atmosphere, and a base shaft that is housed in the chamber while being inserted through the base shaft The valve device according to claim 1, further comprising a valve body biasing spring that biases the valve body in a forward direction. The control valve is composed of a spool that protrudes from the valve mount while being retractably held by the valve mount, and an effective stroke of the spool is arranged between the valve mount at both ends of the spool and a valve body biasing spring. The valve device according to claim 1, further comprising: a stopper portion that causes the input portion to face the input regulating mechanism of the input means at both ends of the spool. 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, comprising a passage, wherein a check valve is disposed in the communication passage. The valve device according to claim 9, wherein the spool is formed in a central portion of the main body portion positioned in the valve mount and has a cut groove that opens and closes the bypass passage when the spool is slid.

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