JP2006250344A - Opening/closing valve structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing valve structure in which the valve is set in the normally open type and flowing of the working oil is secured when the valve is opened, capable of accomplishing a closed condition in which a flow passage is closed completely when a solenoid is energized without causing the solenoid to be large sized. <P>SOLUTION: The opening/closing valve structure of normally open type is configured so that the valve is installed in the flow passage to allow the working oil from one side F to pass through to the other side T, for admitting the working oil to flow through the flow passage when the solenoid 4 is demagnetized and hindering flowing of the working oil through the passage when the solenoid 4 is excited, and the arrangement further includes a bulkhead 1 arranged to shut the passage and having a communication passage 1a to admit the working oil from one side to flow to the other side and a valve element 2 confronting the valve seat surface 1c on the other side T of the bulkhead 1 and also confronting the communication passage 1a which is open to the valve seat surface 1c, wherein the valve element 2 is advanced by the thrust force given by the solenoid 4 acting on the back face to approach the valve seat surface 1c confronting and is further advanced by the oil pressure given from one side acting on the back face in the generated adjoining condition to be seated on the valve seat surface 1c confronting for closing the communication passage 1a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an on-off valve structure, and more particularly to an on-off valve structure that is set to a normally open type and closes a flow path of hydraulic oil when a solenoid that is an actuator is excited.

  For example, Patent Document 1 discloses a valve structure that has a predetermined damping effect by closing the flow path of hydraulic oil when an actuator solenoid is excited. If the output shaft as a plunger protrudes with a large stroke, that is, protrudes to the maximum and the hydraulic fluid flow path is completely closed, the hydraulic fluid flow path is completely closed when the solenoid is excited. Therefore, it can be diverted to the on-off valve structure set to the normally open type.

  That is, in the above-described valve structure, when the solenoid that is the actuator is excited, it is via the output shaft that is the plunger. It is assumed that a predetermined damping action is realized when hydraulic oil passes through.

  And in one proposal, the plate valve that moves forward by the thrust from the solenoid tends to sit on the partition wall and close the flow path of the hydraulic oil, but when the hydraulic oil flows out by pushing the plate valve open It is assumed that a predetermined damping action is realized.

  In another proposal, when the annular flow path is formed when the tip of the poppet that moves forward by the thrust from the solenoid is present in the hole that is the flow path of the opening in the partition wall, The predetermined damping action is realized by the hydraulic oil passing through the flow path.

Therefore, according to the valve structure disclosed in Patent Document 1, the output shaft as the plunger protrudes with a large stroke when the solenoid as the actuator is excited, that is, protrudes to the maximum and completely closes the flow path of the hydraulic oil. By setting so as to be, this can be diverted to an on-off valve structure that is set to a normally open type and that completely closes the flow path of hydraulic oil when the solenoid is excited.
JP 2004-205030 A (Claims Claims 1, Claims 2, Paragraphs 0015, 0033, 0035, 0055, 0057, 0064, 0071, FIGS. 2 and 3)

  However, there is a concern that the proposal of diverting the valve structure disclosed in Patent Document 1 to the open / close valve structure is likely to lack feasibility.

  That is, in the above-described valve structure, even if the output shaft protrudes most at the time of excitation of the solenoid, it is only necessary to narrow the flow path of the hydraulic oil, so the protrusion amount of the output shaft, that is, the stroke amount is , Small.

  On the other hand, when the on-off valve structure that diverts the above valve structure is opened, hydraulic fluid is allowed to pass without undue resistance ensuring a wide flow path, while at the time of closing operation due to solenoid excitation, it is completely It is important to increase the stroke amount of the output shaft in order to bring out a closed state.

  Therefore, when diverting the valve structure described above to an on-off valve structure, it may be proposed to increase the stroke of the output shaft by increasing the solenoid, but by increasing the solenoid, the stroke of the output shaft can be increased. In the proposal to increase the size, the solenoid is increased, and therefore, the on-off valve structure having the solenoid is easily realized, which tends to increase the size and weight.

  As a result, an on-off valve structure with a larger solenoid will be heavier and will be inferior in handling and installation, and may contribute to a reduction in manufacturing costs. It will be lost and it will be pointed out that its feasibility is likely to be lacking.

  The present invention was devised in view of the above-described circumstances, and the object of the present invention is to set the normally open type to ensure the passage of hydraulic oil during the opening operation, while making the solenoid unnecessarily large. To provide an on-off valve structure that is optimal for expecting an improvement in versatility by completely closing the flow path when the solenoid is excited without blocking the passage of the hydraulic oil.

  In order to achieve the above-described object, the structure of the on-off valve structure according to the present invention is basically arranged in a flow path through which hydraulic oil from one side passes to the other side and flows when the solenoid is demagnetized. In a normally open type on-off valve structure that allows hydraulic oil to pass through the passage and prevents hydraulic fluid from passing through the flow passage when the solenoid is excited, it is arranged to block the flow passage and operates from one side A partition body having a communication passage that allows passage of oil toward the other side, and a valve body that faces the communication passage that opens on the valve seat surface while facing the valve seat surface on the other side of the partition body. The valve body is advanced by thrust from the solenoid acting on the back surface and is adjacent to the opposing valve seat surface, and is most advanced and opposed by hydraulic pressure from one side acting on the back surface under this neighboring state. Valve sea Seated on the surface and formed by closing the communication passage.

  Therefore, according to the on-off valve structure according to the present invention, the valve body that has received thrust from the excited solenoid moves forward and is close to the opposing valve seat surface, so that the valve body tends to throttle the communication path. A differential pressure is generated before and after the valve body, and depending on the generation of the differential pressure, the hydraulic pressure from one side acts on the valve body to further advance the valve body and close the communication path. Become.

  Therefore, in the present invention, the solenoid only has to protrude the output shaft to such an extent that the valve body can be moved forward at the time of excitation so that the valve body is close to the opposing valve seat surface. There is no need to project the output shaft to the maximum extent with a large stroke, that is, the solenoid does not need to be sized to allow the valve body to be directly advanced with its thrust. It will be.

  As a result, according to the on-off valve structure according to the present invention, it is set to a normally open type to ensure the passage of hydraulic oil at the time of opening operation, while the solenoid is not unnecessarily enlarged and the flow path is opened at the time of solenoid excitation. It can be completely closed.

  Hereinafter, the present invention will be described based on the illustrated embodiment. The on-off valve structure according to the present invention is basically disposed in a flow path that allows hydraulic oil from one side to pass to the other side. Thus, it is set to a normally open type that permits passage of hydraulic oil in the flow path when the solenoid is demagnetized and prevents passage of hydraulic oil in the flow path when the solenoid is excited.

  In the drawing, one side is a front fork F which is a hydraulic shock absorber body, and the other side is a reservoir tank T having a sealed structure similar to an accumulator, for example. The on-off valve structure according to the present invention is embodied in a housing H that is disposed so as to be connected to each other.

  Incidentally, the housing H is arranged in a flow path made of, for example, a pressure pipe, as shown in FIG. 1, and is integrally connected to the front fork F in the place shown in FIG. Yes.

  By the way, the on-off valve structure according to the present invention embodied in the housing H includes a partition body 1 and a valve body 2, and further includes a push body 3 and a solenoid 4. 1, the partition body 1, the valve body 2, and the push body 3 are accommodated in the housing H, and the solenoid 4 is integrally held in the housing H.

  3, the bulkhead body 1, the valve body 2 and the push body 3 are accommodated in the housing H, the solenoid 4 is integrally held in the housing H, and further, the reservoir tank T is It is assumed that the housing H is integrally held.

  Incidentally, as for the state of arrangement of the solenoid 4, as long as a predetermined thrust is generated, the solenoid 4 may be housed in the housing H instead of being shown, but it may be housed in the housing H. 4 may be housed in an appropriate casing held in the housing H.

  The partition wall 1 is disposed in the housing H so as to block a flow path connecting the front fork F and the reservoir tank T, and the other side of the hydraulic oil from the front fork F on one side. It has a communication path 1a that allows passage toward the reservoir tank T.

  At this time, as shown in the figure, the partition wall body 1 has an outer periphery adjacent to the inner periphery of the housing H under the liquid-tight structure, so that the inside of the housing H is communicated with the front fork F so-called vertically. The upstream side is divided into a downstream side communicating with the reservoir tank T.

  The partition body 1 is located in the housing H as shown in FIG. 1 and its outer corner 1b is locked to a stepped portion H1 formed on the inner periphery of the housing H to maintain this state. As described above, the biasing spring 12 serving as a spacer whose base end is locked to the cap 11 is fixed at a predetermined position.

  The cap 11 closes the lower end opening of the housing H formed in a headed and substantially cylindrical shape under a liquid-tight structure. In the drawing, the cap 11 has an inner end of the opening end H2 in the housing H of the snap ring 13. It is assumed that it is fixed at a predetermined position by fitting around the circumference.

  Incidentally, the housing H has a communication hole H3 for communicating the interior thereof with the front fork F, and a communication hole H4 for communicating the interior thereof with the reservoir tank T. 1 is positioned between both communication holes H3 and H4.

  Further, regarding the biasing spring 12 described above, considering that this also serves as a spacer, this is not composed of the spring member shown in the figure, but although not shown, an opening that is aimed at the communication hole H3 is provided in the body part. Of course, it may be made of a cylindrical body.

  The valve body 2 is made of a plate valve formed in an annular shape in the figure, and is open to the valve seat surface 1c while facing the valve seat surface 1c on the reservoir tank T side in the partition wall 1 described above. It is formed to face the passage 1a, and is seated on the valve seat surface 1c at the time of the most forward movement in the drawing to close the communication passage 1a (see FIG. 2).

  At this time, the valve body 2 is interposed on the outer periphery of the interposed guide cylinder 15 on the outer periphery of the center rod 14 that penetrates the shaft core portion of the partition wall body 1 and extends so-called vertically. It is said.

  The valve body 2 is slidable in the vertical direction in the figure while being interposed on the outer periphery of the guide cylinder 15, that is, the valve body 2 can be distant while facing the valve seat surface 1c in the partition wall 1 described above. In addition, the communication passage 1a that opens to the valve seat surface 1c can be opened and closed.

  By the way, the valve body 2 is in the illustrated embodiment, and when the valve body 2 is most advanced and seats on the valve seat surface 1c in the partition wall body 1 to close the communication passage 1a (see FIG. 2), The relief operation is allowed to allow the passage of an abnormally high pressure hydraulic oil having a predetermined hydraulic pressure.

  That is, in order to prevent the so-called bottom butt in the front fork F when the front fork F is most contracted, the flow path communicating with the reservoir tank T is closed by the valve body 2 in this on-off valve structure. It is possible to develop a so-called oil lock phenomenon.

  Therefore, in this on-off valve structure, closing the flow path communicating with the reservoir tank T by the valve body 2 forcibly shuts off the flow path, so that the so-called no-going hydraulic action acts. In other words, it is important not to cause a malfunction such as a seal breakage in the front fork F due to an abnormally high pressure.

  Therefore, when an abnormal high pressure occurs in the front fork F, the relief valve is operated to release the abnormal high pressure to the reservoir tank T. The operation of the relief valve is replaced with the valve body 2 described above. It is about to try.

  At this time, since the valve body 2 is composed of a plate valve, it is less likely to bend on the outer peripheral side compared to the case where it is composed of a leaf valve. Therefore, the valve body 2 pushes up the push body 3 described later. And the abnormal high pressure from the front fork F is released to the reservoir tank T.

  Needless to say, the valve body 2 may be composed of laminated leaf valves. However, in this case, the outer peripheral side can be expected to bend compared to the case where the valve body 2 is composed of a plate valve. Therefore, it can be said that the valve body 2 can easily release the abnormal high pressure from the front fork F to the reservoir tank T without the push body 3 being pushed up.

  The push body 3 is arranged in series in the rear side of the above-described valve body 2 while being formed in a cylindrical shape, so that the valve body 2 is lowered in the drawing when the push body 3 moves forward in the downward direction in the drawing. In the illustrated case, the guide cylinder 15 is interposed on the outer periphery on the upper end side so as to be movable up and down.

  Further, the tip that is the lower end of the push body 3 should be brought into direct contact with the back surface on the inner peripheral side of the valve body 2 in view of its original function. It is supposed to be abutted under the intervention.

  Therefore, in the case of the embodiment having the spacer 21, the distance between the valve body 2 and the valve seat surface 1 c facing the valve body 2 is selected by appropriately selecting the number of the spacers 21, that is, the thickness. It can be arbitrarily adjusted.

  Incidentally, the push body 3 moves forward in the downward direction in the figure due to an external force acting on the rear end thereof. In the present invention, thrust from the solenoid 4 described later and hydraulic pressure from the front fork F are This will be explained later.

  The solenoid 4 is assumed to be held by the head of a housing H having a substantially cylindrical shape with a head, and an output shaft 41 serving as a plunger so as to penetrate the shaft core portion of the head (see FIG. 2). Is located in the housing H, and the tip that faces downward faces the rear end of the push body 3 described above.

  At this time, the protruding amount of the output shaft 41 in the solenoid 4 is assumed to be a stroke indicated by D in FIG. 1, that is, a slight stroke, which is apparent from the following description. In the invention, the amount of protrusion of the output shaft 41 in the solenoid 4 is sufficient for this slight stroke.

  By the way, in the illustrated embodiment, the thrust of the solenoid 4 is transmitted to the push body 3 by a thrust transmission mechanism having the following configuration.

  That is, the thrust transmission mechanism is connected to the mass body 42 that abuts the tip of the output shaft 41 of the solenoid 4 and covers the upper end portion of the center rod 14, and the lower end of the mass body 42 is connected to the center. A plurality of guide rods 43 extending downward along the rod 14 are provided.

  The lower ends of the plurality of guide rods 43 are brought into contact with the rear end of the push body 3 that is formed in a cylindrical shape. It is supposed that the push body 3 is moved forward in a synchronized manner when lowered by the thrust from the solenoid 4.

  At this time, the lower end side of each guide rod 43 is slidably connected to a holder member 44 that also serves as a partition wall, and the lower end of the guide rod 43 is so-called swaying while the lower end of the guide rod 43 is so-called the holder member 44. It is made to adjoin the rear end of the push body 3 accommodated inside.

  Incidentally, the holder member 44 also serving as the partition wall allows the center rod 14 to penetrate the shaft core portion while being formed in a headed cylindrical shape, that is, on the outer periphery of the center rod 14 and the above-described guide cylinder 15. It is said that it is inserted so as to be in series.

  And it is supposed that the lower end side of each guide rod 43 mentioned above will be connected with the head in this holder member 44 under the state which aligned in the circumferential direction.

  The holder member 44 also serves as a partition wall because the holder member 44 constitutes a hydraulic transmission mechanism that applies the hydraulic pressure from the front fork F to the push body 3.

  That is, in the illustrated embodiment, the hydraulic transmission mechanism is defined between the pressure guide hole 14a opened in the shaft core portion of the center rod 14, and the upper end of the center rod 14 and the lower end side of the mass body 42. The space A formed and communicated with the pressure introducing hole 14a, the communication hole 42a opened in the mass body 42 to communicate the void A with the outside of the mass body 42, and communicated with the outside of the mass body 42. It has a hydraulic route (see a broken line a in FIG. 1) formed by a sliding gap (not shown) between the guide rod 43 and the holder member 44, and a partition wall is formed by this hydraulic route. The hydraulic pressure from the front fork F branched on the upstream side of the communicating passage 1 a opened in the body 1 can be guided to the rear end of the push body 3.

  From this, that is, in establishing the above hydraulic route, the holder member 44 also serves as a partition wall. Therefore, the holder member 44 has a liquid outer periphery on the inner periphery of the housing H. Adjacent to a dense structure.

  Here, the center rod 14 described above will be briefly explained. In the figure, the center rod 14 penetrates the shaft core portion of the partition wall 1 and extends vertically in the figure, but the lower end portion is the partition wall in the figure. The check valve portion is embodied by being present below the body 1.

  That is, in the illustrated embodiment, there are a plurality of communication passages 1 a opened in the partition wall body 1, and an arbitrary number of communication passages 1 a in the plurality of communication passages 1 a are opened and closed by the valve body 2. The upstream end which is the lower end side in the drawing is closed by the check valve 5 so as to be openable.

  At this time, the check valve 5 is composed of an annular leaf valve, and is interposed between the cylindrical spacer 51, the non-return spring 52 and the valve stopper 53 so as to be movable up and down at the lower end portion of the center rod 14. Yes.

  Incidentally, by providing the check valve 5, for example, the so-called vacuum phenomenon occurs in the front fork F when the front fork F extends and operates while the above-described valve body 2 closes the communication path 1 a. Even when there is a risk of being expressed, it may be possible to prevent the vacuum phenomenon from occurring.

  Therefore, in the on-off valve structure according to the present invention formed as described above, when the solenoid 4 is not energized, the valve body 2 is retracted so as to be lifted in the figure and is opened to the partition body 1. Since the drilling communication path 1a is opened, the hydraulic oil from the front fork F can flow out to the reservoir tank T by passing through the communication path 1a.

  At this time, in the front fork F, an air spring effect can be obtained by the air chamber of the front fork F and the air chamber of the reservoir tank T, and the front fork is mounted with so-called reaction force being soft. This will improve the riding comfort of motorcycles.

  On the other hand, in this on-off valve structure, when the solenoid 4 is excited, the push body 3 moves forward by the thrust of the solenoid 4, and therefore, the hydraulic action from the front fork F on the advanced valve body 2 is achieved. Thus, a differential pressure is generated on the front and rear sides of the valve body 2.

  Then, due to the occurrence of this differential pressure, as shown by the broken line a in FIG. 1, the hydraulic pressure from the front fork F acts on the back surface of the push body 3 and the push body 3 moves forward most, and the push body 3 moves forward most. As a result, the valve body 2 moves forward most, sits on the partition wall body 1, and closes the opposing communication path 1a.

  At this time, the valve body 2 moves forward with a large stroke as shown by reference numeral D1 in FIG. 2 as compared with the protruding amount D of the output shaft 41 in the solenoid 4, that is, the output shaft of the solenoid 4 41 is sufficient with a small stroke, but the valve body 2 is also advanced with a large stroke under the hydraulic action.

  As a result, according to the present invention, an on-off valve structure that is set to a normally open type is realized using the solenoid 4, and the passage of hydraulic oil is ensured during the opening operation, while the solenoid 4 is Without enormous increase in size, it becomes possible to completely close the flow path when the solenoid 4 is excited to prevent the passage of hydraulic oil, which is optimal for expecting an improvement in versatility.

  By the way, when this on-off valve structure closes the flow path, the front fork F only has an air spring effect in its own air chamber, and the front fork is mounted with a so-called reaction force as hard. The occurrence of nose dive phenomenon during sudden braking in a two-wheeled vehicle can be prevented.

  As described above, the housing H that embodies the on-off valve structure according to the present invention is connected to a pressure-resistant pipe that forms a flow path that connects the front fork F on one side and the reservoir tank T on the other side. If this invention intends, the housing H may be integrally or integrally connected to the wheel side tube in the front fork F, for example.

  That is, the place shown in FIG. 3 is that the housing H is connected to the wheel side tube F1 constituting the front fork F. In this embodiment, a pressure hose is not required, for example, There is an advantage of improving the mountability of the front fork F to a motorcycle.

  Explaining a little, in the case shown in FIG. 3, the housing H has an on-off valve portion having a solenoid 4 and a check valve portion, and the housing H integrally holds the reservoir tank T. Yes.

  In the following description, unless the configuration is the same as that shown in FIG. 1 described above, the detailed description is omitted only by attaching the same reference numerals in the drawing unless otherwise required.

  By the way, the on-off valve portion includes the partition body 1, the valve body 2, the push body 3, and the solenoid 4 described above, but at this time, unlike the embodiment shown in FIG. It is assumed that the check valve 5 is not distributed on the partition wall 1.

  In other words, as shown in the figure, the partition wall 1 is paired with the partition body 6 disposed in the check valve portion, and the valve body 2 is disposed on the partition body 1 which is one side. It is assumed that the check valve 5 is disposed on the partition wall body 6 which is the other side.

  Therefore, in the embodiment shown in FIG. 3, the on-off valve portion only exhibits the on / off function and the relief function by the valve body 2, and the check valve function by the check valve 5 is the check valve portion side described later. Will depend on.

  At this time, the valve body 2 is directly interposed in a state where it is supported by the center rod 14 penetrating the shaft core portion of the partition wall body 1, and the center rod 14 is energized. It is assumed that the spring 12 maintains the lifted state.

  The push body 3 that allows the valve body 2 to be seated on the partition wall body 1 is configured to advance directly by the thrust of the solenoid 4.

  The hydraulic pressure from one side through the pressure guide hole 14a opened in the shaft core portion of the center rod 14 is caused by the opening hole 3a in the shaft core portion of the push body 3 and the upper end portion of the push body. The push body 3 acts on the rear end of the push body 3 through the lateral hole 3b formed in FIG.

  Next, the check valve portion includes a check valve 5 that closes the open communicating hole 6a in the partition wall body 6 so as to be openable from the front fork F side on one side. The check valve portion is configured to be positioned on the axial line of the reservoir tank T.

  Thus, there is an advantage that the occupied area can be reduced as compared with the case where the check valve portion is connected to the outer periphery of the reservoir tank T, for example.

  Incidentally, the reservoir tank T is formed in a structure that defines the air chamber T2 with the free piston T1, and when the front fork F contracts, a part of the hydraulic oil that flows out from the front fork F flows in. In this case, the air chamber T2 described above cooperates with the air chamber in the front fork F to exhibit a predetermined air spring effect.

  In view of the above, in this embodiment, since the on-off valve portion and the check valve portion are separately disposed, the on-off valve portion is compared with the case of the embodiment shown in FIG. It is advantageous in that the check valve part interferes with the operation of the part, and the open / close valve part interferes with the operation of the check valve part, so that stable operation performance can be ensured.

  In the above description, the housing H that embodies the on-off valve structure according to the present invention is disposed in the flow path that connects the front fork F on one side and the reservoir tank T on the other side. From the intended point of view, the above-mentioned housing H is approximately in the flow path where the hydraulic oil passes, for example, although not shown, in the flow path where one side is the high pressure side and the other side is the low pressure side. Of course, it may be distributed.

It is a figure which shows one Embodiment of the on-off valve structure by this invention. It is a figure which shows the state which the valve body advanced most from the state of FIG. It is a figure which shows other embodiment of the on-off valve structure by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,6 Partition body 1a, 6a Communication path 1c Valve seat surface 2 Valve body 3 Push body 4 Solenoid 5 Check valve F Front fork which is one side H Housing T Reservoir tank which is the other side

Claims (6)

It is arranged in a flow path that allows hydraulic oil from one side to pass to the other side, and allows the hydraulic oil to pass through the flow path when the solenoid is demagnetized and prevents the hydraulic oil from passing through the flow path when the solenoid is excited. In the normally open type on-off valve structure, a partition body having a communication path that is arranged to block the flow path and allows passage of hydraulic oil from one side toward the other side, and A valve seat opposite to the valve seat surface on the other side and facing the communication passage that opens to the valve seat surface, and the valve body is advanced and opposed by thrust from a solenoid acting on the back surface. An on-off valve structure characterized in that it is adjacent to the surface and is seated on the opposite valve seat surface by the hydraulic pressure from one side acting on the back surface under this neighboring state and closes the communication passage 2. The on-off valve structure according to claim 1, wherein a push body is adjacent to the back surface of the valve body, and thrust from the solenoid acts on the push body and hydraulic pressure from one side acts. The valve body is constituted by a plate valve or a laminated leaf valve, and a relief operation is performed to allow passage of hydraulic oil having a predetermined hydraulic pressure from one side to the other side when the valve body is seated on the partition body and the communication path is closed. The on-off valve structure according to Item 1 There are a plurality of communication passages formed in the partition wall, and any number of communication passages of the plurality of communication passages has a check valve that prevents the hydraulic oil from passing from one side to the other side. The on-off valve structure according to claim 1 A valve body is disposed on one partition body while a pair of partition bodies is formed, and a check valve is disposed on the other partition body to prevent passage of hydraulic oil from one side to the other side. The on-off valve structure according to 1. The hydraulic shock absorber body embodying the flow of hydraulic oil in the flow path at the time of expansion and contraction operation, and the other side is a reservoir tank that allows inflow of hydraulic oil at the time of contraction operation of the hydraulic shock absorber body. The on-off valve structure according to 1.

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