JP5395746B2 - Fluid pressure buffer - Google Patents

Description

  The present invention relates to a fluid pressure shock absorber, and more particularly to an improvement of a damping force adjusting means for adjusting a damping force in a fluid pressure shock absorber.

  Various proposals have been made for fluid pressure shock absorbers so far. For example, the fluid pressure shock absorber is used as a suspension device such as a front fork or a rear cushion unit that suspends a front wheel of a motorcycle and attenuates road surface vibration input to the front wheel. The

  As disclosed in Patent Document 1, the front fork is formed between a fork main body composed of an outer tube and an inner tube, a damper accommodated in the fork main body, and the fork main body and the damper. And a reservoir chamber.

  As shown in FIG. 4, the damper includes a cylinder 30 that stands up at the axial center of the inner tube (not shown) and accommodates a working fluid therein, and an extension side chamber R <b> 1 and a pressure side chamber R <b> 2 in the cylinder 30. And a rod 31 fixed to the outer tube (not shown) via a cap member (not shown) and holding the piston 32.

  The piston 32 includes ports P1 and P2 communicating with the expansion side chamber R1 and the pressure side chamber R2, and a valve that generates resistance when the working fluid passes through the ports P1 and P2 and attenuates the expansion and contraction motion of the fork main body. Damping force generating means V1 and V2 are provided.

  Further, the front fork has a damping force adjusting means for adjusting the damping force by the damping force generating means V1 and V2. The damping force adjusting means includes a bypass path B10 that bypasses the damping force generating means V1 and V2, and this It comprises a changing means 400 for changing the opening amount of the bypass passage B10 and an actuator (not shown) for driving the changing means 400 in the axial direction by the input of an external force.

  The bypass passage B10 is provided in a tip member 350 that is fixed to the tip of the rod 31 and to which the piston 32 is mounted on the outer periphery, and has a vertical hole B11 that opens to the compression side chamber side, and a horizontal hole that opens to the extension side chamber side. B12 and the extension side chamber R1 and the compression side chamber R2 are communicated.

  The changing means 400 includes a control rod 401 that is formed in a rod shape and is movably inserted into a through hole 310 that passes through the axial center of the rod 31, and a needle 402 that abuts on the tip of the control rod 401. And is biased to the actuator side by a return spring 403 interposed between the tip member 350 and the needle 402.

  The needle 402 has a pointed end inserted into the vertical hole B11, opens and closes the bypass path B10 at the pointed end, and the bypass path B10 when the pointed end abuts against the tip member 350 and bottoms out. Is blocked.

  Although not shown, the actuator moves the control rod 401 in the axial direction by moving the shaft forward and backward by excitation of a built-in solenoid, and changes the opening amount of the bypass passage B10.

  Therefore, the front fork can change the flow rate of the working fluid passing through the damping force generation means V1 and V2 by inputting an electric signal to the actuator, and can adjust the damping force.

JP 2010-007758 A

  In the technique of Patent Document 1, by providing the return spring 403, the changing unit 400 is sandwiched between the return spring 403 and the actuator, and the opening amount of the bypass passage B10 can be arbitrarily maintained. The following problems may be pointed out.

  First, when the tip of the needle 402 of the changing means 400 is attached to the tip member 350 to completely close the bypass path B10, the impact when the wheel is pushed up due to the road surface unevenness is Since it acts on an actuator via the piston 32 and the change means 400, the load concerning an actuator is large.

  Second, since the changing means 400 is always urged toward the actuator by the return spring 403, a thrust against the urging force is required to advance the changing means 400 toward the bypass path B10.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fluid pressure shock absorber that can prevent the changing means from bottoming and can eliminate the return spring.

  Means for solving the above-mentioned problem comprises a damping force generating means for generating a predetermined damping force and a damping force adjusting means for adjusting the damping force, and the damping force adjusting means is the damping force generating means. In the fluid pressure shock absorber having a bypass path that bypasses the path, a changing means that changes the opening amount of the bypass path, and an adjuster that moves in the axial direction by the input of an external force to drive the changing means, the changing means includes: A valve portion for extending and retracting a distal end portion in the bypass passage; and a connecting portion that extends to a proximal end side of the valve portion and is connected to the adjuster, and is fixed to the connecting portion or the adjuster and It is to provide a regulating member that regulates the moving amount of the changing means.

  According to the present invention, it is possible to regulate the amount of movement of the changing means without bottoming out the changing means by providing the regulating member, and the return means can be eliminated by connecting the changing means to the adjuster. Thus, the changing means can be advanced with a smaller thrust than in the prior art.

It is a half sectional view showing a front fork which is a fluid pressure shock absorber according to an embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows the cap member periphery part in the front fork which is a fluid pressure buffer which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which partially cuts and shows the front fork which is a fluid pressure buffer which concerns on other embodiment of this invention. It is a longitudinal cross-sectional view which shows the piston peripheral part in the front fork which is a fluid pressure buffer which concerns on the conventional form.

  Hereinafter, a fluid pressure shock absorber showing an embodiment of the present invention will be described with reference to the drawings. The same reference numerals given throughout the several drawings indicate the same or corresponding parts.

  The fluid pressure shock absorber according to the present embodiment is a front fork that suspends a front wheel of a two-wheeled vehicle, and attenuates road surface vibrations input to the front wheel due to road surface unevenness.

  Although not shown, the front fork is composed of a pair of left and right fork members standing on both sides of the front wheel, and each fork member is slidable in the outer tube 1 and the outer tube 1 as shown in FIG. A fork main body comprising an inserted inner tube 2, a damper 3 having a damping force generating means V1 accommodated in the fork main body and generating a predetermined damping force, and a damping force adjusting means for adjusting the damping force; Is provided.

  The damping force adjusting means includes a bypass path B that bypasses the damping force generating means V1, a changing means 4 that changes the opening amount of the bypass path B, and an axial movement that is input by an external force, and the changing means 4 And an adjuster 5 for driving.

  The changing means 4 has a valve portion 40 for projecting and retracting the distal end portion in the bypass passage B, and a connecting portion 41 extending to the proximal end side of the valve portion 40 and connected to the adjuster 5. .

  Further, the front fork includes a restricting member 6 that is fixed to the connecting portion 41 or the adjuster 5 and restricts the movement amount of the changing means 4.

  Below, each component of the front fork which shows one embodiment of this invention is each demonstrated.

  The front fork has an outer tube 1 disposed on the vehicle body side and an inner tube 2 disposed on the wheel side so as to be set upside down. The tube 2 is connected to the front wheel via a wheel-side bracket to suspend the front wheel.

  The fork main body composed of the outer tube 1 and the inner tube 2 has upper and lower ends sealed with a cap member 10 and a bottom member 20, respectively, and a suspension composed of an upright damper 3 and a coil spring. The spring S1 is accommodated.

  By providing the above configuration, the front fork absorbs the impact input to the front wheels by the road surface unevenness by the suspension spring S1, and the damper 3 attenuates the expansion and contraction motion of the fork main body accompanying the impact absorption.

  A reservoir chamber R is formed between the fork body and the damper 3, and a working fluid is stored in the reservoir chamber R, and an air chamber G is formed above the liquid level O of the working fluid. Is done.

  Further, the front fork includes an actuator 7 made of a motor disposed on the cap member 10 by a housing 71. By inputting an electrical signal to the actuator 7, the motor shaft 70 is rotated and the adjuster 5 is rotated. To adjust the damping force.

  Although not shown, the actuator 7 is connected to a control means such as an ECU (Engine Control Unit) via a cable connected to a connector formed on a side surface.

  The control means performs an automatic operation by inputting an electrical signal to the actuator 7 based on information detected by a sensor provided in the motorcycle.

  The actuator 7 may be a solenoid, or an electric signal may be input by a manual operation by the rider.

  The damper 3 accommodated in the fork main body rises at the axial center portion of the inner tube 2 and accommodates the working fluid therein, and is fixed to the outer tube 1 so that the tip side protrudes and retracts into the cylinder 30. A rod 31 to be moved, a piston 32 held at the tip of the rod 31, and a base member 33 fixed to the bottom portion of the cylinder 30.

  The inside of the cylinder 30 is partitioned by a piston 32, and an extension side chamber R1 located on the rod side and a pressure side chamber R2 located on the piston side are formed.

  The rod 31 that appears and disappears in the cylinder 30 is fixed to the outer tube 1 via the cap member 10. Specifically, the base end portion of the rod 31 is screwed into the rod holding portion 11 of the cap member 10, and a nut. N to prevent loosening.

  Further, the rod 31 is inserted into the cylinder 30 while being guided by an annular rod guide 34 that is screwed into the upper end opening of the cylinder 30 in the drawing, and a tip member 35 that is screwed into the tip portion is inserted into the cylinder 30. Via which the piston 32 is held.

  The piston 32 includes an expansion side port P1 and a compression side port P2 (see FIG. 3) that allow the expansion side chamber R1 and the compression side chamber R2 to communicate. The expansion side port P1 always communicates with the expansion side chamber R1 and is a compression side chamber. The opening on the side is provided with an extension side leaf valve (extension side damping force generating means V1), while the compression side port P2 is always in communication with the compression side chamber R2, and the opening on the extension side chamber has a compression side check valve C2. Provided.

  The extension side leaf valve V1 is separated from and seated on the pressure side chamber side seat surface of the extension side port P1 formed in the piston 32, and when the fork main body is extended, the extension side leaf valve V1 in the extension side chamber R1 is pressurized. It is pushed open by the working fluid to create a gap with the seat surface, and when the working fluid passes through this gap, a resistance is generated to generate a damping force, which functions as an extension-side damping force generating means V1.

  Further, when the fork main body contracts, the extension side leaf valve V1 is pressed against the seat surface by the working fluid in the pressure side chamber R2 to be pressurized to keep the extension side port P1 closed.

  On the other hand, the pressure side check valve C2 is seated on the seat surface of the pressure side port P2 formed on the piston 32 on the side of the expansion side chamber, and when the fork body contracts, the pressure side chamber R2 is actuated. It is pushed open by the fluid to form an opening with the seat surface, and does not prevent the working fluid from passing through the compression side port P2.

  Further, when the fork main body is extended, the pressure side check valve C2 is pressed against the seat surface by the working fluid in the extension side chamber R1 to be pressurized and keeps the pressure side port P2 closed.

  The base member 33 provided at the bottom portion of the cylinder 30 includes an extension side port P3 and a pressure side port (not shown) for communicating the pressure side chamber R2 and the reservoir chamber R.

  The expansion side port P3 always communicates with the reservoir chamber R, and an opening on the pressure side chamber is provided with an expansion side check valve C3, while the pressure side port always communicates with the pressure side chamber R and opens on the reservoir chamber side. Is provided with a pressure side check valve (not shown).

  The extension side check valve C3 is formed on the base member 33 and is seated on the pressure side chamber side of the extension side port P3. When the fork main body is extended, the extension check valve C3 is opened and retracted. Insufficient working fluid in the volume integrating cylinder 30 is supplemented from the reservoir chamber R.

  On the other hand, a pressure side check valve of the base member 33 (not shown) is formed on the base member 33 and is seated on the seat surface on the reservoir chamber side. When the fork body contracts, the valve 31 is opened and immersed. The surplus working fluid in the volume integrating cylinder 30 is caused to flow into the reservoir chamber R.

  With the above configuration, the fork main body shown in FIG. 1 can function as an extension-side fork member that generates a damping force when extended, and a compression-side fork member (not shown) that generates a damping force when contracted. ) To form a front fork.

  The pressure-side fork member can be realized by replacing the pressure-side check valve of the base member 33 with a pressure-side leaf valve and generating a pressure-side damping force when the working fluid passes through the pressure-side leaf valve. is there.

  The configuration of the damping force generating means for generating the stretching force on the extension side or the compression side can use a conventionally known configuration, and is not limited to that shown in the figure.

  By the way, the suspension spring S1 accommodated in the fork main body is formed of a coil spring, and is between a cylindrical upper spring receiver Z1 fixed to the cap member 10 and a lower spring receiver Z2 fixed to the rod guide 34. The fork body is urged in the extending direction.

  Rebound springs S2 and S3 are provided above and below the rod guide 34 along the outer periphery of the rod 31, respectively. The rebound springs S2 and S3 are shocks when the front fork is most compressed and most extended. To absorb.

  The damping force adjusting means for adjusting the damping force in the damper 3 includes a bypass path B that bypasses the damping force generating means V1, a changing means 4 that changes the opening amount of the bypass path B, and an axial direction by an external force input. And an adjuster 5 that moves to drive the changing means 4.

  The bypass passage B is formed in a rod inner passage B1 penetrating the axial center portion of the rod 31, and a tip member 35 holding the piston 32 at the tip of the rod 31, and the rod inner passage B1 and the extension side chamber R1. An extension chamber side channel B2 that communicates with the outer tube 1 and a reservoir chamber side channel B3 that is formed on the cap member 10 that fixes the rod 31 to the outer tube 1 and communicates the in-rod channel B1 and the reservoir chamber R. Consists of.

  In addition, a check valve C5 is provided inside the distal end portion of the rod 31, and this check valve C5 only allows the working fluid passing through the bypass passage B to move from the extension side chamber R1 to the reservoir chamber R. .

  With the above configuration, when the fork main body is extended, the working fluid in the extension side chamber R1 to be pressurized presses the extension side leaf valve V1 and pushes the check valve C5 in the bypass passage B open. A part of the working fluid flows out into the reservoir chamber R through the bypass passage B.

  Therefore, the flow rate of the working fluid passing through the extension side leaf valve V1 is changed by the opening amount of the bypass passage B, and the extension side damping force generated by the front fork is changed.

  When the fork member is configured as a pressure-side front fork that generates a compression-side damping force and the compression-side damping force is adjusted, the bypass channel B may be communicated with the compression-side chamber R2 and the reservoir chamber R. .

  Specifically, although not shown, it can be realized by providing the tip member 35 with a pressure chamber side channel that communicates the in-rod channel B1 and the pressure side chamber R2 in place of the extension chamber side channel B2. is there.

  The changing means 4 for changing the opening amount of the bypass passage B includes a valve portion 40 facing the reservoir chamber side flow passage B3, and a connecting portion extending to the proximal end side of the valve portion 40 and connected to the adjuster 5. 41, and is accommodated in the hollow portion 10a penetrating the axial center portion of the cap member 10 so as to be movable in the axial direction.

  Specifically, as shown in FIG. 2, the cap member 10 has a cap member body 12 whose outer periphery is in close contact with the inner periphery of the outer tube via a seal (not shown), and extends from the cap member body 12 to the rod side. The changing means holding member 13 that accommodates the changing means 4 in the hollow portion 10a so as to be movable in the axial direction, and the rod holding portion 11 that extends from the changing means holding member 13 to the rod side and holds the rod 31. Prepare.

  The changing means 4 is driven by the adjuster 5 and moves in the axial direction to move the tip of the valve portion 40 forward and backward into the reservoir chamber side channel B3, thereby reducing the opening amount of the reservoir chamber side channel B3. Change the flow rate of the working fluid passing through the bypass B.

  For example, when the changing means 4 is advanced into the reservoir chamber side flow path B3 to reduce the opening amount of the reservoir chamber side flow path B3, the flow rate of the working fluid passing through the damping force generation means V1 increases and attenuates. When the force increases and the changing means 4 is retracted from the reservoir chamber side flow path B3 to increase the opening amount of the reservoir chamber side flow path B3, the flow rate of the working fluid passing through the damping force generation means V1 is increased. Decrease and decrease damping force.

  It should be noted that the above-described configuration of the changing means 4 that adjusts the opening amount of the reservoir chamber side flow path B3 can be used in common for both the extension side and the pressure side of the fork member.

  As shown in FIG. 2, the adjuster 5 that drives the changing means 4 is held by an adjuster case 50 fixed to the actuator side of the changing means holding member 13 so as to be movable in the axial direction.

  The adjuster case 50 includes an annular base 51 that is press-fitted inside the cap member 10 and faces the changing means holding member 13, and a cylindrical adjuster holding part 52 that extends from the base 51 toward the actuator. Consists of.

  A space 60 is formed between the changing means holding member 13 and the adjuster case 50, and the regulating member 6 fixed to the connecting portion 41 of the changing means 4 moves in the axial direction in the space 60. Provided possible.

  The adjuster 5 includes a screw portion 53 having a screw groove on the outer periphery and the change means 4 screwed to the tip thereof, and an external force input portion that extends coaxially with the bolt portion 53 and receives an external force from the actuator 7. 54.

  The external force input unit 54 includes a shaft hole (not shown) into which the motor shaft 70 of the actuator 7 is inserted, and has an outer periphery in sliding contact with the adjuster holding unit 52.

  With the above-described configuration, when an electric signal is input to the actuator 7, the adjuster 5 rotates and moves in the axial direction as the motor shaft 70 rotates, and the change means 4 is driven in the axial direction. It becomes possible.

  The relationship between the motor shaft 70 and the shaft hole is not limited as long as the adjuster 5 rotates together with the motor shaft 70 and can move in the axial direction, and a well-known configuration can be adopted as appropriate.

  The changing means 4 is screwed to the tip of the bolt portion 53 located on the lower end side in the figure, and the changing means 4 is prevented from loosening by a regulating member 6 made of a nut.

  The regulating member 6 is movably disposed in the space 60 formed between the changing means holding member 13 formed on the cap member 10 and the adjuster case 50 as described above. It is formed with a larger diameter than the connecting portion 41 of the changing means 4 that is in sliding contact with the circumference.

  Accordingly, the changing means 4 moves upward in the drawing (the right side in FIG. 2) until the upper surface of the restricting member 6 in the drawing contacts the lower face of the adjuster case 50 in the drawing (the right side in FIG. 2), The member 13 moves downward in the drawing until it contacts the upper surface 13a in the drawing (left side in FIG. 2).

  That is, the movement of the changing means 4 in the axial direction is restricted by the restricting member 6, and the provision of the configuration prevents the changing means 4 from completely closing the bypass path B, thereby It is possible to regulate the movement amount of the changing means 4 without attaching.

  Therefore, it is possible to prevent an impact when the wheel is pushed up due to the unevenness of the road surface from acting on the actuator 7 via the piston 32, the rod 31, the cap member 10 and the changing means 4, and to apply a load to the actuator 7. It becomes possible to prevent.

  Further, by screwing the changing means 4 into the bolt portion 53 of the adjuster 5 and connecting the adjuster 5 and the changing means 4, the conventional return spring 403 can be eliminated.

  That is, unlike the conventional front fork, it is not necessary to advance the changing means 4 against the urging force of the return spring 403 (FIG. 4), and the actuator 7 can be driven with a smaller force than the conventional one. The actuator 7 can be downsized.

  Further, the conventional front fork has a conventional changing means when the impact acts on the tip member 350 via the piston 32 to deform the shape of the tip member 350 and the rod 31 is distorted to change the rod length. Since the amount of movement of 400 is regulated by the bottom of the needle 402, the amount of movement of the changing means 400 changes.

  However, when the restriction member 6 is disposed in the space 60, not only when the tip member 35 or the rod 32 is deformed due to the impact, but also when the shape of the rod holding portion 11 is deformed, the change member holding member 13. Since the shape of the upper surface 13a is difficult to change, the moving amount of the changing means 4 does not change.

  Further, by taking into account the deformation of the rod holding portion 11, the movement amount of the changing means 4 is set by the regulating member 6, so that the bottom of the changing means 4 is always prevented and the actuator 7 is loaded. It can be surely prevented.

  Although the restriction member 6 can be a nut, the restriction member 6 can restrict the movement of the changing means 4 in the axial direction and can prevent the changing means 4 from loosening. Can be selected.

  For example, although not shown, the regulating member 6 may be a flange formed on the connecting portion 41 of the changing means 4, and may be fixed to the bolt portion 53 of the adjuster 5 by welding or the like.

  In the present embodiment, the changer 4 is connected to the adjuster 6 by screwing. However, the present invention is not limited to this, and the means for connecting the adjuster 6 and the changer 4 can be selected as appropriate. , May be formed integrally.

  Similarly, in the present embodiment, in the front fork, the bypass passage B that bypasses the damping force generating means V1 communicates with the expansion side chamber R1 or the compression side chamber R2 and the reservoir chamber R, and the working fluid is reversed in the in-rod passage B1. Although it is provided with a so-called squirting type damping force adjusting means for jetting into the reservoir chamber R from the upstream reservoir chamber side flow path B3, this is not restrictive.

  Hereinafter, another embodiment of the damping force adjusting means will be described with reference to the drawings. Since the configuration other than the bypass path and the changing unit of the damping force adjusting unit is the same as that of the above-described one embodiment, the detailed description is omitted only by attaching the same reference numerals.

  In the present embodiment, the damping force adjusting means includes a bypass path B4 that bypasses the damping force generation means V1, a changing means 4A that changes the opening amount of the bypass path B4, and an external force, as in the above-described embodiment. And an adjuster 5 for driving the changing means 4A by moving in the axial direction.

  As shown in FIG. 3, the bypass passage B4 is formed in the distal end member 35 to communicate the extension side chamber R1 and the compression side chamber R2, and the opening amount thereof is changed by the changing means 4A.

  The changing means 4A is accommodated in a valve portion 44 that protrudes and protrudes in the bypass passage B4, and a through hole 36 that extends upward in the drawing of the valve portion 44 and penetrates the axial center portion of the rod 31. The rod portion 45 is movable in the axial direction, and the connecting portion 46 extends upward in the figure of the rod portion 45 and slidably contacts the inner periphery of the changing means holding portion 13 of the cap member 10.

  The adjuster 5 for driving the changing means 4A includes an external force input portion 54 and a bolt portion 53, as in the above-described embodiment, and the bolt portion 53 is screwed into the connecting portion 46.

  A regulating member 6 made of a nut is screwed onto the bolt portion 53 of the adjuster 5 on the actuator side of the connecting portion 46. The regulating member 6 is the same as the regulating member 6 of the above-described embodiment. It is possible to move in the space 60 to restrict the axial movement of the changing means 4A and to prevent the changing means 4A from loosening.

  Also in the present embodiment, similarly to the above-described one embodiment, it is possible to prevent the bottom of the changing means 4 </ b> A by the restriction member 6 and to prevent the actuator 7 from being loaded. Become.

  Further, by connecting the adjuster 5 and the changing means 4A, the conventional return spring 403 can be eliminated, and the actuator 7 can be advanced into the bypass passage B4 with a smaller force than before, and the actuator 7 can be downsized. It becomes possible to do.

  In addition, by taking into account the deformation of the tip member 35 and the rod 31, the amount of movement of the changing means 4A is set by the restriction member 6, so that the bottom of the changing means 4A is always prevented and the actuator 7 is loaded. Can be reliably prevented.

  While the preferred embodiment of the present invention has been described above, it should be understood that modifications, variations and changes may be made without departing from the scope of the claims.

  For example, the fork members standing on both sides of the front wheel may be provided with expansion side and compression side damping force generation means, respectively, and the configuration of the fork members can be selected as appropriate.

  In each of the above embodiments, the front fork is set upside down and accommodates an upright damper. However, the present invention is not limited to this, and the front fork and the damper may be upright or inverted. It is possible to embody the present invention.

  In the above embodiment, the present invention is embodied in a front fork, but is not limited thereto, a rear cushion unit for suspending a rear wheel of a two-wheeled vehicle, a suspension device for suspending a wheel of a four-wheeled vehicle, etc. The present invention may be embodied in another fluid pressure buffer.

B, B4, B10 Bypass passage B1 Rod internal passage B2 Extension side chamber side passage B3 Reservoir chamber side passage C1 Pressure side check valve C3 Extension side check valve C5 Check valve G Air chamber O Oil level R Reservoir chamber R1 Extension side chamber R2 Pressure side Chamber V1 Extension side damping force generation means (extension side leaf valve)
V2 Pressure side damping force generation means (pressure side leaf valve)
P1, P3 Extension side port P2, P4 Pressure side port S1 Suspension spring 1 Outer tube 2 Inner tube 3 Damper 4, 4A Change means 5 Adjuster 6 Restriction member 7 Actuator 10 Cap member 13 Change means holding member 20 Bottom member 30 Cylinder 31 Rod 32 Piston 33 Base member 34 Rod guide 35, 350 Tip member 36, 320 Through hole 40, 44 Valve part 41, 46 Connection part 45 Rod part 50 Adjuster case 51 Base 52 Adjuster holding part 53 Bolt part 54 External force input part 60 Space 400 Conventional Changing means 401 Control rod 402 Needle 403 Return spring

Claims (3)

A damping force generating means for generating a predetermined damping force; and a damping force adjusting means for adjusting the damping force.
A bypass path in which the damping force adjusting means bypasses the damping force generating means, a changing means for changing the opening amount of the bypass path, and an adjuster that moves in the axial direction by the input of an external force to drive the changing means. Having a fluid pressure shock absorber,
The changing means has a valve part that causes the tip part to protrude and retract in the bypass path, and a connecting part that extends to the base end side of the valve part and is connected to the adjuster,
A fluid pressure shock absorber, comprising: a restricting member that is fixed to the connecting portion or the adjuster and restricts a moving amount of the changing means. A changing means holding member that accommodates the changing means in an axially movable manner in a hollow portion that penetrates the shaft center;
An adjuster case which is formed in a cylindrical shape facing the changing means holding member and in which the adjuster is held so as to be movable in the axial direction;
A space formed between the changing means holding member and the adjuster case,
2. The movement amount of the changing means is restricted by moving the regulating member in the space and contacting the changing means holding member and the adjuster case. Fluid pressure shock absorber. The adjuster includes a bolt portion having a screw groove on the outer periphery and the change means being screwed to the tip, and an external force input portion that extends coaxially with the bolt portion and receives an external force,
3. The fluid pressure shock absorber according to claim 2, wherein the restricting member includes a nut that is screwed into the bolt portion and abuts against an end surface on the side opposite to the bypass of the changing unit.

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