JP2007255476A - Structure of adjusting valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of an adjusting valve capable of not only changing cracking pressure in a leaf valve by turning operation of an adjuster but also widening a scope of possibility of the change to make it optimum for improving its general-purpose property. <P>SOLUTION: This structure of the adjusting valve has a valve body 6 connected with a body 3 to be connected in a liquid-tight structure, the adjuster 7 capable of advancing and retracting by turning operation from the outside for a terminal part 7a while fitting and screwing into a shaft axis part of the valve body 6, the leaf valve 8 provided at the outer periphery on a tip side in the adjuster 7, an energizing spring 9 arranged between the leaf valve 8 and the valve body 6 to set cracking pressure in the leaf valve 8, and a washer 10 nipped and held between the valve body 6 and the energizing spring 9. This structure is connected with the adjuster 7 in the interlocking relationship while forming a detent mechanism between the washer 10 and the valve body 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an adjustment valve structure, and more particularly to an improvement of an adjustment valve structure that enables adjustment of the generated damping force in a hydraulic shock absorber mounted on a vehicle under the presence of a detent mechanism by an external operation.

  There have been various proposals for an adjustment valve structure that enables adjustment of the generated damping force in a hydraulic shock absorber mounted on a vehicle under the presence of a detent mechanism by external operation. For example, in the proposal disclosed in Patent Document 1, the assembling property is improved.

  That is, the adjustment valve structure disclosed in Patent Document 1 is mounted on a hydraulic shock absorber constituting a rear cushion unit mounted on the rear wheel side of a motorcycle, for example, or on the front wheel side of a motorcycle. It is said that it is embodied in a hydraulic shock absorber constituting a front fork to be mounted.

  For example, the hydraulic shock absorber constituting the rear cushion unit includes a shock absorber main body whose upper and lower ends are connected to the vehicle body side and the wheel side of the motorcycle, and a tank that is connected to the shock absorber main body and functions as an air spring. The adjustment valve structure is arranged in such a manner that the flow passage area in the communication path that connects the shock absorber body and the tank can be widened and narrowed.

  On the other hand, this adjustment valve structure includes a valve body connected under a liquid-tight structure to a connected body forming a so-called valve housing in which the above-described communication path is formed and this adjustment valve structure is disposed, and the valve An adjuster that is screwed onto the shaft core of the body and rotated by an external operation with respect to the base end portion to be able to advance and retreat in the axial direction, a leaf valve that faces the tip of the adjuster, and the leaf valve It is assumed that there is an urging spring disposed between the adjusters, and that the adjuster, the urging spring, and the leaf valve are disposed in series.

  In this adjustment valve structure, a detent mechanism is provided between the adjuster and the biasing spring, and this detent mechanism is sandwiched between the tip of the adjuster and the rear end of the biasing spring. The washer is disposed as described above, and a fitting portion is provided between the washer and the tip of the adjuster so as to be detachably seated.

Therefore, according to the adjusting valve structure disclosed in the above-mentioned Patent Document 1, it is sufficient to sequentially incorporate the adjuster, washer, biasing spring and leaf valve when assembling the adjusting valve structure. There is an advantage that the assemblability is improved as compared with the conventional method of assembling in the direction crossing the axial direction.
JP-A-2003-166582 (paragraphs 0055, 0056, 0057, 0058, 0059, 0069, 0070, FIGS. 3, 4 and 5 in the summary)

  However, in the adjustment valve structure disclosed in Patent Document 1 described above, while it is considered that the assembling property is good, there is a possibility that it may be pointed out that there is a slight problem in its implementation. .

  In other words, considering the case where the above-described adjustment valve structure is embodied, the adjuster is often configured to be rotated using, for example, a tool as a screwdriver. The so-called blade length at the tip is about 3 to 5 m / m.

  In view of this, the adjuster that is rotated using the driver is only about 5 to 7 m / m even at a portion where the diameter becomes maximum by, for example, having a screw thread on the outer periphery of the valve body. Therefore, when the detent mechanism disposed between the tip of the adjuster and the rear end of the biasing spring is observed, it is accommodated in a region having a diameter of about 5 to 7 m / m.

  Therefore, in the detent mechanism in the adjustment valve structure described above, a detent means is provided to prevent the washer from rotating as the adjuster rotates. Is formed with a projecting piece projecting radially in the outer periphery of the washer, and a vertical groove in which the projecting piece resides on a valve body to which the adjuster is screwed.

  Therefore, in the above-described adjustment valve structure, there is no problem in making the cracking pressure in the leaf valve variable by rotating the adjuster, but it is not easy to realize the detent mechanism. There is a risk that the possible range is likely to be limited.

  The present invention was devised in view of such a current situation, and the object of the present invention is that the cracking pressure in the leaf valve can be made variable by the rotation operation of the adjuster. It is to provide a regulating valve structure that is optimal for widening the range and expecting to improve its versatility.

  In order to achieve the above-described object, the configuration of the adjusting valve structure according to the present invention basically includes a valve body connected to a connected body under a liquid-tight structure, and screwing of a shaft core portion of the valve body. However, an adjuster that can be moved forward and backward by a rotation operation from the outside with respect to the base end portion, a leaf valve that is interposed on the outer periphery on the distal end side of the adjuster, and the leaf valve and the valve body are disposed. And a washer sandwiched between the valve body and the energizing spring. A detent mechanism is formed between the washer and the valve body. Suppose that they are connected so that they can move together.

  Therefore, in the present invention, when assembling the adjusting valve structure, after the adjuster is screwed to the valve body, the washer that forms the detent mechanism is attached to the end of the adjuster. In other words, stacking is performed, and then it is sufficient to sequentially incorporate the biasing spring and the leaf valve in a state of being interposed on the tip end side of the adjuster, and the assembling property is improved.

  At this time, since the washer that forms the detent mechanism is stacked on the valve body in which the adjuster is screwed to the shaft core portion, the washer can be formed larger than the diameter of the adjuster. Compared to the case of being embodied within the range, it becomes easier to realize the adjuster mechanism.

  The present invention will be described below on the basis of the illustrated embodiment. The adjustment valve structure according to the present invention is a front of a motorcycle, for example, a hydraulic shock absorber that is mounted on the front wheel side and suspends the front wheel. It is said to be embodied in a fork.

  As shown in FIG. 1, the adjusting valve structure according to the present invention is disposed on a bottom portion 1 a of a wheel side tube 1 that forms a fork main body that extends and contracts with a vehicle body side tube. As shown in the figure, the brake caliper portion 1b formed integrally with the bottom portion 1a has a part of the valve housing 3 as a connected body for distributing the adjusting valve structure. To form.

  Therefore, as shown in the figure, it is possible to improve the material yield when the adjustment valve structure is provided on the front fork and to prevent the bottom portion 1a of the front fork from being unnecessarily enlarged. .

By the way, looking at the situation where this adjustment valve structure is arranged at the bottom part 1a of the wheel side tube 1, for example, a mechanic or rider can easily carry out a predetermined adjustment by an external operation, Next, the adjustment valve structure according to the present invention disposed in the bottom portion 1a of the fork main body is in principle the flow path of hydraulic oil when the fork main body expands and contracts. It is assumed that the pressure side damping force is generated when the fork main body is contracted, and the pressure side damping force can be adjusted in level.

  That is, the illustrated front fork has a damper at the shaft core portion of a fork main body in which a wheel side tube 1 as an inner tube is inserted in a vehicle body side tube as an outer tube so as to be able to protrude and retract.

  The damper is configured such that a rod body suspended from the shaft core portion of the vehicle body side tube is inserted into the cylinder body 2 standing on the shaft core portion of the wheel side tube 1 so that the rod body can be projected and retracted. It is assumed that the rod body expands and contracts in synchronism, that is, the rod body appears and disappears from the cylinder body 2 to generate a predetermined damping force.

  At this time, the damper generates an extension side damping force by an extension side damping valve provided in the piston body in the cylinder body 2 during the extension operation, and the compression side damping force depends on the present invention as described above. It is supposed to be generated with the regulating valve structure.

  Incidentally, regarding the generation of the compression side damping force, it is assumed that the compression side damping force is generated at the base valve portion in the cylinder body constituting the damper. A valve structure has been proposed for adjusting the compression-side damping force generated at the base valve portion.

  On the other hand, in the present invention, the compression side damping force is generated by the adjusting valve structure described below, and this adjusting valve structure further adjusts the compression side damping force generated by the adjusting valve structure by itself. In this sense, it can be said that the present invention may be a damping valve structure.

  Further, according to the present invention, since it is not necessary to provide a base valve portion as a compression side damping force generating portion in the cylinder body 2 in the damper, it is advantageous in that the configuration of the damper can be simplified.

  In the illustrated front fork, when the damper expands and contracts, the oil chamber 4 in the damper, that is, the cylinder body 2, and the reservoir chamber 5 outside the damper, that is, outside the cylinder body 2, communicate with each other. The adjustment valve structure of the present invention is disposed in a communication path that is a flow path that communicates between the oil chamber 4 and the reservoir chamber 5.

  At this time, the communication path includes a flow path 3 a communicating with the oil chamber 4 in the cylinder body 2 opened in the valve housing 3 and a flow path 3 b communicating with the reservoir chamber 5 outside the cylinder body 2. The adjusting valve structure of the invention is in the valve housing and is arranged at the junction of the flow path 3a and the flow path 3b.

  By the way, as shown in FIG. 2, the adjustment valve structure includes a valve body 6, an adjuster 7, a leaf valve 8, a biasing spring 9, and a washer 10, and the washer 10 and the valve body 6 The detent mechanism is arranged between the two and the adjuster 7 has the sub-valve 11.

  In this adjustment valve structure, the hydraulic oil from the oil chamber 4 in the cylinder body 2 is connected to the reservoir chamber outside the cylinder body 2 via the leaf valve 8 when the damper is contracted. It is assumed that a compression-side damping force is generated when it flows out to 5.

  Further, in this adjustment valve structure, the pressure side generated in the leaf valve 8 is changed by changing the cracking pressure in the leaf valve 8 by the rotation operation of the adjuster 7 from outside, for example, by a mechanic or rider. It is supposed to be possible to adjust the damping force level.

  Furthermore, this adjustment valve structure has a detent mechanism so that the changed state can be maintained when the adjuster 7 is rotated to change the cracking pressure of the leaf valve 8.

  Incidentally, the detent mechanism can solve the problem that it is difficult to add a so-called step by rotating under a certain resistance when the adjuster 7 is rotated, that is, it is difficult to add sharpness to the rotation of the adjuster 7. .

  Further, in this adjustment valve structure, the sub-valve 11 can adjust the compression side damping force generated by the leaf valve 8 whose cracking pressure has been changed by the rotation of the adjuster 7 to a higher or lower level.

  More specifically, first, the valve body 6 is connected to the valve housing 3 as a connected body in a liquid-tight structure under the arrangement of the seal member 61, that is, screwed.

  At this time, in the valve body 6, the amount of screwing into the valve housing 3 is determined by the flange-like flange portion 6 a formed on the outer periphery of the body portion coming into contact with the end surface of the valve housing 3.

  In the valve body 6, the adjuster 7 is screwed onto the shaft core portion, and the adjuster 7 is held in a state in which a leaf valve 8 described later is interposed.

  That is, in the adjustment valve structure disclosed in Patent Document 1 described above, the valve body 6 referred to in the present invention is formed to hold the leaf valve 8 referred to in the present invention. The adjuster 7 holds the leaf valve 8 without holding the leaf valve 8.

  As a result, in the adjustment valve structure disclosed in the above-mentioned Patent Document 1, since the valve body has a connecting portion for holding the leaf valve, that is, a state having a restriction frame, the detent mechanism is It will be provided within the range of the diameter of the adjuster disposed inside the connecting portion serving as the restriction frame, so that a small detent mechanism is formed.

  On the other hand, since the valve body 6 of the present invention does not show the posture having the restriction frame as described above, the detent mechanism in the present invention is not affected by the restriction frame. It can be provided within the range of the diameter of the body 6, and therefore, it is embodied in an appropriate size as compared with the case of the adjusting valve structure disclosed in Patent Document 1 described above.

  Next, the adjuster 7 is rotated by an external operation with respect to the base end portion 7a while being screwed on the shaft core portion of the valve body 6 described above, so that the adjuster 7 can advance and retreat in the axial direction which is the left-right direction in the drawing. It is going to be done.

  Incidentally, the rotation of the adjuster 7 shown in the figure is practiced under the connection of a spanner, which is an appropriate tool, with respect to the base end portion 7a. For example, it is preferable to connect a cap to the base end portion 7a to prevent mud from adhering to the base end portion 7a and its peripheral portion. It can also be said.

  When the cap is connected to the base end portion 7a of the adjuster 7, it is necessary to consider the diameter of the cap. However, the adjuster 7 can be rotated by using the cap as a wrench. It can be said that it will be possible.

  It should be noted that the adjuster 7 shown in the figure is screwed in most deeply into the valve body 6 and is not screwed any further. At this time, as will be described later, the cracking pressure in the leaf valve 8 is increased. It is kept in the weakest state.

  In this embodiment, the leaf valve 8 is a compression-side damping valve. In the drawing, a plurality of annular leaf valves having different diameters are stacked, and the right side in the figure of the adjuster 7 described above. The inner peripheral side end is fixed to the outer periphery on the distal end side, and the outer peripheral end is interposed in a free posture. Similarly, the valve seat member 81 interposed in the outer periphery on the distal end side is opened. In the drawing of the pressure side flow path 81a, the downstream end which is the left end is closed so as to be openable and closable.

  Incidentally, in principle, the valve seat member 81 is opened in the valve housing 3 and communicated with the oil chamber 4 in the cylinder body 2 and the valve housing 3 is also opened in the cylinder body. 2, communication with the flow path 3 b communicating with the outer reservoir chamber 5 is interrupted at the junction of the two. In the drawing, the outer periphery is held at the inner end of the valve housing 3 while being held at the tip end side of the adjuster 7. It has a sealing member 82 and is in close contact with the liquid-tight structure.

  And this valve seat member 81 has the expansion side flow path 81b parallel to said pressure side flow path 81a, and can open and close the downstream end used as the right end in the figure of this expansion side flow path 81b. The check valve 83 is composed of a single annular leaf valve that is closed.

  The above-described leaf valve 8, valve seat member 81, and check valve 83 are basically assembled sequentially with the step portion 7c formed on the outer peripheral side of the body portion 7b of the adjuster 7 as a locking portion. It is going to be.

  At this time, the leaf valve 8 has an inner peripheral side end fixed to a cylindrical spacer 71 interposed on the tip end side of the adjuster 7, and the valve seat member 81 has an inner boss portion and a cylindrical shape. It is assumed that the inner end of the leaf valve 8 is sandwiched between the spacer 71 and the spacer 71.

  In addition, the check valve 83 is interposed at the front end side of the adjuster 7 in a state of being interposed on the outer periphery of the cylindrical spacer 72 that is locked to the inner boss portion of the valve seat member 81.

  Further, a valve stopper 73 that regulates the lift amount of the check valve is fixed to the cylindrical spacer 72 so as to overlap, and this posture is maintained by screwing the piston nut 74 to the tip side of the adjuster 7. At this time, the valve stopper 73 holds the non-return spring 75 that urges the check valve 83 from the back side.

  The urging spring 9 is a coil spring as shown in the figure, and is arranged between the leaf valve 8 and the valve body 6 to set a cracking pressure in the leaf valve 8.

  At this time, in the present invention, as shown in the figure, the urging spring 9 is locked to the valve body 6 via a washer 10 to be described later. It is possible to set the winding diameter of the coil spring larger than in the case where the base end of the biasing spring is also locked to the adjuster via the washer. Become.

  That is, in the case of a coil spring, when the wire diameter and winding pitch are the same, the coil spring having a larger winding diameter has a rate of change of the spring force with respect to the contraction amount of the coil spring than the coil spring having a smaller winding diameter. Smaller is well known.

  From this, since the rate of change of the spring force in the coil spring that embodies the adjusting valve structure according to the present invention can be smaller than that of the conventional one described in Patent Document 1, the spring force of the biasing spring 9 can be reduced. Can be avoided, and the operating force for rotating the adjuster 7 is not greatly increased or decreased, that is, the cracking pressure in the leaf valve 8 is extremely increased or decreased. Will be avoided.

  Note that the base end which is the left end of the biasing spring 9 in the drawing is locked to the valve body 6 under the presence of the washer 10, whereby the biasing spring 9 exerts a spring force in the circumferential direction. It can act evenly toward the valve body 6.

  Further, the right end of the urging spring 9 in the figure is locked to the back surface of the leaf valve 8 with the spring seat 91 interposed therebetween. Therefore, the leaf valve 8 is a spring that is uniform in the circumferential direction. The force is received from the biasing spring 9.

  Therefore, in the adjusting valve structure according to the present invention having the adjuster 7 and the leaf valve 8 formed as described above, when the fork main body which is a front fork expands and contracts, that is, it is built in the fork main body. When the damper expands and contracts, it operates as follows.

  That is, first, when the damper is contracted, the hydraulic oil from the oil chamber 4 in the cylinder body 2 forming the damper flows into the valve housing 3 through the flow passage 3a opened in the valve housing 3. come.

  The hydraulic oil that has flowed into the valve housing 3 opens the leaf valve 8 via the pressure side flow path 81a of the valve seat 81, and also opens the valve housing 3 via the open flow path 3b. It flows out to the reservoir chamber 5 outside the cylinder body 2.

  At this time, the hydraulic oil opens the leaf valve 8 for which the cracking pressure is set by the biasing spring 9, so that the compression side damping force set by the leaf valve 8 is generated.

  Next, contrary to the above, when the damper is extended, the hydraulic oil from the reservoir chamber 5 outside the cylinder body 2 flows into the valve housing 3 via the flow passage 3b opened in the valve housing 3, so to speak. Come.

  The hydraulic oil that has flowed into the valve housing 3 opens the check valve 83 via the expansion-side flow path 81b of the valve seat portion 81, and at the same time, opens the check valve 83 via the flow-through path 3a. Thus, it returns to the oil chamber 4 in the cylinder body 2b.

  At this time, the hydraulic oil opens the check valve 83 so as to overcome only the spring force of the non-return spring 75, so that insufficient shortage of hydraulic oil is not caused in the oil chamber 4 in the cylinder body 2. .

  By the way, as described above, in the present invention, the compression side damping force is generated in the adjusting valve structure, and the height of the adjusting side is made possible in the adjusting valve structure as described above. Specifically, this is realized by rotating the adjuster 7.

  To explain a little, when the adjuster 7 is turned from the state shown in the drawing, the adjuster 7 is extracted from the shaft core portion of the valve body 6 to the outside as the left side portion in the drawing.

  As a result, the leaf valve 8 held by the adjuster 7 moves to the left in the drawing and approaches the valve body 6, so that the urging spring 9 is contracted to increase the spring force and increase the cracking pressure. Therefore, the compression side damping force generated by the leaf valve 8 is generally increased.

  The cracking pressure in the increased leaf valve 8 is reversed by the adjuster 7, that is, by screwing the adjuster 7 into the valve body 6, the leaf valve 8 is restored to the old state. Therefore, the biasing spring 9 is extended to reduce the spring force, and the cracking pressure is reduced.

  By the way, the detent mechanism maintains the operating state of the adjuster 7 described above, and this detent mechanism has a fitting portion that fits between the washer 10 and the valve body 6 so as to be separable from each other. In the drawing, the fitting portion is assumed to be an uneven portion formed between the washer 10 and the valve body 6 facing the washer 10.

  That is, as shown in FIG. 2, the valve body 6 has a steel ball 62 that forms a convex portion, and the washer 10 has a concave portion 10 a as a concave portion that allows the steel ball 62 to be immersed. It is supposed to become.

  At this time, it is assumed that the steel balls 62 are accommodated in a hole 6b formed in the end surface of the valve body 6 facing the base end of the suspension spring 9, and the holes 6b are equally spaced in the circumferential direction. It is said that it is provided at a plurality of locations.

  On the other hand, the recessed portion 10a in the washer 10 is provided on the end face facing the steel ball 62 and so as to face the steel ball 62. Basically, the number of the steel balls 62 is It is said that it is provided so that it becomes the same number.

  On the other hand, in the detent mechanism according to the present invention, the washer 10 is coupled to the adjuster 7 under the chamfered structure so that the washer 10 is surely synchronized and rotated when the adjuster 7 is rotated. That is, it is supposed to be interposed.

  That is, the place shown in FIG. 3 is the connected state of the washer 10 and the adjuster 7 as seen at the YY line position in FIG. 2, but the washer 10 has a chamfered portion 10b on the inner periphery. The chamfered portion 7b of the adjuster 7 is brought into contact with the chamfered portion 10b.

  At this time, as shown in the figure, the chamfered portion 10b of the washer 10 and the chamfered portion 7b of the adjuster 7 are formed in the same number. In short, the washer 10 rotates as the adjuster 7 rotates. It's enough.

  Therefore, in that sense, the fact that the number of chamfered portions 10b and 7b is different or the arrangement location is not a limiting element of the present invention. Further, for example, in place of the chamfered structure described above, an adjuster is used. A key structure may be arranged between 7 and the washer 10 so as to realize a synchronized rotation as a follow-up movement between the two, in other words, a free configuration may be selected.

  Therefore, in this detent mechanism, when the adjuster 7 is rotated by the shaft core portion of the valve body 6, the washer 10 is also rotated in synchronization with the adjuster 7.

  At this time, in the washer 10, the steel ball 62 comes out from the recessed portion 10a by the rotation, and the next steel ball 62 continues to be immersed in the recessed portion 10a. The rotating person of the adjuster 7 can feel the so-called light impact when the steel ball 62 is immersed in the recessed portion 10a, and the so-called detent movement can be recognized.

  In view of the above, the detent mechanism may have any configuration as long as the detent movement can be recognized. For example, the detent mechanism is devised as shown below in FIG.

  That is, in the place shown in FIG. 4A, instead of the steel ball 62 being arranged on the valve body 6, a hemispherical protrusion 6c is formed, and this protrusion 6c is formed in the recessed part 10a of the washer 10. In this case, the washer 10 may be formed with a hole 10c instead of the recessed portion 10a.

  In FIG. 4B, a hole 10d is formed in place of the steel ball 62 disposed in the valve body 6, and a hemispherical protrusion that replaces the recessed portion 10a of the washer 10 is formed in the hole 10d. The portion 10d may be immersed, and at this time, in the washer 10, the protrusion 10d may be formed by press molding, or may be raised by casting or the like.

  As described above, when the washer 10 is connected to the adjuster 7 under a chamfered structure, for example, as disclosed in Patent Document 1 described above, a protruding piece is formed on the outer periphery of the washer. There is an advantage that the yield of the material in forming the washer 10 is improved as compared with the case of using the measures.

  Next, as shown in the figure, the adjuster 7 has the sub-valve 11 in the shaft core portion, and the so-called basic high / low damping force set by the adjuster 7 can be further adjusted by the sub-valve 11. is doing.

  That is, a bypass passage that bypasses the leaf valve 8 described above is formed in the shaft core portion of the adjuster 7, and a sub-valve 11 that widens and narrows the flow passage area in the bypass passage is disposed in the bypass passage. Yes.

  At this time, the bypass path is opened in the axial core portion on the tip end side of the adjuster 7, and is formed in a vertical hole 7 d that opens on the oil chamber 4 side in the cylinder body 2 and a trunk portion that is continuous with the tip end side of the adjuster 7. The horizontal hole 7e is opened and opened to the reservoir chamber 5 side outside the cylinder body 2 while communicating with the vertical hole 7d.

  The sub-valve 11 is composed of a needle whose tip end is present at the junction of the vertical hole 7d and the lateral hole 7e, whereas the leaf valve 8 described above enables control of the damping force of the valve characteristic. The sub-valve 11 is capable of controlling the damping force of the orifice characteristic.

  The sub-valve 11 has, for example, a steel ball and a coil spring which are well-known in the prior art, and are configured differently from the detent mechanism described above, for example, by connecting a driver to the base end which is the left end in the figure. The detent mechanism can be rotated.

  Therefore, in the sub-valve 11, this enables the damping force control of the orifice characteristic, so that when the fork main body expands and contracts, the piston speed in the cylinder body 2 in the damper is in the low to low speed range. The damping force can be appropriately controlled, and the riding comfort in a motorcycle as a vehicle can be improved.

  In the above description, the adjustment valve structure according to the present invention has been described as an example of a front fork as a hydraulic shock absorber mounted on the front wheel side of a motorcycle as a vehicle. However, the present invention is intended. Therefore, the adjustment valve structure according to the present invention may be embodied in a rear cushion unit that is a hydraulic shock absorber disposed between the vehicle body side and the wheel side on the rear wheel side of the motorcycle that is a vehicle. Of course.

  In this case, the adjustment valve structure is a flow that communicates between a shock absorber body disposed between the vehicle body side and the wheel side of the vehicle and a tank that is connected to the shock absorber body and functions as an air spring. It is preferable that the valve body 6 is connected to the valve housing 3 which is a connected body as a portion forming the path.

It is a front view which shows a partially broken lower end side portion of a front fork as a hydraulic shock absorber embodying an adjustment valve structure according to the present invention. It is a longitudinal cross-sectional view which expands and shows the adjustment valve structure of FIG. FIG. 3 is a cross-sectional view showing a connected state of a washer and an adjuster at a YY line position in FIG. 2. (A), (B) is a partial view which shows other embodiment of a detent mechanism, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel side tube 1a Bottom part 2 Cylinder body 3 Valve housing which is a to-be-connected body 4 Oil chamber in a cylinder body 5 Reservoir chamber outside a cylinder body 6 Valve body 6c, 10d Projection part 6d, 10a which fits a fitting part Recessed portion that forms a concave portion 7 Adjuster 7b, 10b Chamfered portion constituting chamfered structure 7d Vertical hole constituting bypass passage 7e Horizontal hole constituting bypass passage 8 Leaf valve 9 Energizing spring 10 Washer 11 Sub valve 62 Fitting A steel ball that forms a joint

Claims (5)

A valve body connected to a body to be connected under a liquid-tight structure, an adjuster that can be moved forward and backward by an external rotation operation with respect to a base end portion while being screwed on the shaft core portion of the valve body; A leaf valve interposed on the outer periphery on the front end side, an urging spring that is arranged between the leaf valve and the valve body and sets a cracking pressure in the leaf valve, and between the valve body and the urging spring An adjusting valve structure comprising a washer that is sandwiched and connected to an adjuster while forming a detent mechanism between the washer and the valve body. 2. The adjusting valve structure according to claim 1, wherein the detent mechanism has a fitting portion formed between the washer and the valve body facing the washer so as to be detachably fitted to each other. 2. The adjusting valve structure according to claim 1, wherein the washer is connected to the adjuster under a chamfered structure and is set so as to be able to move along with the rotation of the adjuster. 2. The adjusting valve structure according to claim 1, wherein a bypass passage that bypasses the leaf valve is formed in the shaft core portion of the adjuster, and a sub-valve that widens and narrows the flow passage area in the bypass passage is disposed in the bypass passage. . 2. The adjusting valve structure according to claim 1, wherein the valve body is connected to the bottom portion of the wheel side tube forming the fork main body that expands and contracts with the vehicle body side tube, and is connected to the valve body.

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