JP2016223459A - Damper - Google Patents

Abstract

A shock absorber capable of eliminating disturbance of an attenuation waveform without requiring an increase in length of the entire length is provided. In the shock absorber according to the present invention, the liquid that has passed through the damping valve V in the reservoir R formed between the inner tube 5 and the outer tube 6 is opposite to the liquid level S of the liquid in the reservoir R. A partition member 14 led to the side was provided, and the partition member 14 was positioned by a ring 21 attached to the cylinder 1. Therefore, the liquid that has passed through the damping valve V does not cause a phenomenon in which the liquid level S is disturbed and stirred with the gas, so that the gas can be prevented from being mixed into the liquid, and the amount of liquid in the reservoir R can be prevented. There is no need to increase. Therefore, the disturbance of the attenuation waveform can be eliminated without increasing the length of the shock absorber. [Selection] Figure 1

Description

  The present invention relates to a shock absorber.

  Some shock absorbers that exhibit a damping force for suppressing vibration can adjust the damping force. As such a shock absorber, for example, an electromagnetic valve using a solenoid as a damping valve is well known to enable damping force adjustment. Here, when it is possible to adjust the damping force during both the extension operation and the contraction operation, it is costly to provide a damping valve that exhibits the damping force during the extension operation and a damping valve that exhibits the damping force during the contraction operation. It will be high.

  Therefore, a passage that allows hydraulic oil to pass through when the shock absorber extends or contracts is provided, and a damping valve is installed in this passage to adjust the damping force during both expansion and contraction operations. A shock absorber has been developed.

  Specifically, this shock absorber is defined by a cylinder, a piston that is slidably inserted into the cylinder, a rod that is moved into the cylinder and connected to the piston, and a piston that is inserted into the cylinder. A rod side chamber, a piston side chamber, an intermediate cylinder that covers the outer periphery of the cylinder and forms a discharge passage between the cylinder, and an outer cylinder that covers the outer periphery of the intermediate cylinder and forms a reservoir between the intermediate cylinder, A suction passage that allows only the flow of hydraulic oil from the reservoir to the piston side chamber, a piston passage that is provided in the piston and allows only the flow of hydraulic oil from the piston side chamber to the rod side chamber, and a discharge passage and the reservoir It is comprised including the provided damping valve (for example, refer patent document 1).

  The shock absorber configured in this way is set to a uniflow type in which hydraulic oil is pushed out from the cylinder to the reservoir through the discharge passage regardless of whether it is extended or contracted. A damping valve provides resistance and exerts a damping force.

JP 2009-222136 A

  The reservoir is provided to compensate for the volume of hydraulic oil that enters and exits into the cylinder of the piston rod, and the reservoir is filled with gas in addition to hydraulic oil. In the conventional shock absorber, the hydraulic oil that has passed through the damping valve becomes a jet and vigorously flows into the reservoir, so that the hydraulic oil in the reservoir facing the gas is agitated by this jet.

  If gas is caught in and mixed in the hydraulic oil in the reservoir due to the agitation of the hydraulic oil, the waveform of the damping force (damping waveform) generated due to the displacement of the shock absorber will be disturbed, and as intended. There is a problem that it becomes difficult to exert the damping force.

  For this reason, the damping valve is arranged as low as possible and away from the hydraulic oil surface, but in order to prevent gas entrainment in the hydraulic oil, the amount of hydraulic oil in the reservoir To increase the oil level. However, if the oil level is set high, the cylinder length of the shock absorber becomes long. For this reason, for example, when there is a restriction on the mounting length of a suspension or the like interposed between the vehicle body and the wheel of the vehicle, it cannot be employed and gas entrainment cannot be prevented.

  Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to provide a shock absorber that can eliminate the disturbance of the attenuation waveform without requiring the entire length to be increased. is there.

  In order to solve the above-described object, the shock absorber according to the present invention includes an inner tube having an opening, and a cylindrical guide portion that forms an annular reservoir between the inner tube and communicates with the opening facing the opening. An outer tube, a valve assembly having a damping valve that provides resistance to the flow of liquid from the inner tube to the reservoir, and a liquid that is provided in the reservoir and has passed through the damping valve. Includes a partition member leading to the opposite side, and the partition member is positioned by a ring mounted on the outer periphery of the inner tube.

  In the shock absorber configured as described above, the liquid that has flowed through the damping valve and is jetted is guided in the direction opposite to the liquid level by the partition member and flows into the reservoir. Does not cause a phenomenon of stirring with gas. The hydraulic oil that has passed through the damping valve does not cause a phenomenon that disturbs the liquid level and stirs with gas, so it is possible to prevent gas from entering the hydraulic oil and increase the amount of liquid in the reservoir. Nor. Furthermore, in the shock absorber of the present invention, the partition member is positioned on the inner tube by the ring, so that the partition member can be positioned at an appropriate position with respect to both the inner tube and the outer tube.

  Further, in the shock absorber according to claim 2, since the partition member is positioned by the ring having the notch portion, the partition member is positioned not only in the axial direction but also in the circumferential direction with respect to the inner tube. When the member is assembled to the inner tube and the outer tube, the partition member remains in an appropriate position, so that the assembling property is good and the assembling can be easily performed.

  In the shock absorber according to claim 3, since the partition member is positioned by the annular ring, the partition member is positioned in the axial direction with respect to the inner tube and assembled to the inner tube and the outer tube of the partition member. In this case, the partition member remains in an appropriate position in the axial direction, so that the assembly can be easily performed.

  Furthermore, in the shock absorber according to the fourth aspect, since the partition member is sandwiched and fixed between the inner tube and the outer tube, a part for fixing the partition member becomes unnecessary, which is advantageous in terms of cost.

  Further, in the shock absorber according to claim 5, the outer tube surrounds the outer periphery of the partition wall member except for the recess and the recess opening that opens to the lower end and forms a flow path between the outer tube and the outer tube. A seal member that is in close contact with the head is provided. In this way, the jet flow discharged from the damping valve leaks from the flow path in the circumferential direction of the partition wall member and does not flow out to the reservoir, so that the gas entrainment prevention effect is improved.

  In the shock absorber according to claim 6, the partition member is formed of rubber, and has a recess and an opening of the recess that open to the lower end of the outer tube side outer periphery and form a flow path between the outer tube and the outer tube. It is provided with a rib that surrounds it and adheres closely to the outer tube. Even if it does in this way, since the jet flow discharged from the damping valve leaks from the flow path to the circumferential direction of the partition member and does not flow out to the reservoir, the effect of preventing gas entrainment is improved.

  In the shock absorber according to the seventh aspect, since it is set to be a uniflow type, it is possible to generate a damping force on both sides of the pressure expansion with a single damping valve, and it is also possible to adjust the damping force on both sides of the pressure expansion.

  According to the shock absorber of the present invention, the disturbance of the attenuation waveform can be eliminated without requiring an increase in the total length.

It is sectional drawing of the shock absorber in this invention. It is a front view of a partition member. It is a rear view of a partition member. It is AA sectional drawing of a partition member. It is BB sectional drawing of a partition member. It is a figure which shows the state which mounted | wore the inner tube with the ring.

  As shown in FIG. 1, the shock absorber of the present invention includes a cylinder 1, a piston 2 that is slidably inserted into the cylinder 1, and a piston rod 3 that is movably inserted into the cylinder 1 and connected to the piston 2. And a rod side chamber R1 and a piston side chamber R2 defined by a piston 2 inserted into the cylinder 1 and a discharge passage 4 that covers the outer periphery of the cylinder 1 and communicates with the rod side chamber R1 through an annular gap between the cylinder 1 and the cylinder 1 An inner tube 5 that covers the outer periphery of the inner tube 5 and an outer tube 6 that forms a reservoir R with an annular gap between the inner tube 5 and a suction that allows only the flow of liquid from the reservoir R to the piston side chamber R2. The passage 7, the rectifying passage 8 that allows only the flow of liquid from the piston side chamber R2 to the rod side chamber R1, the discharge passage 4 and the reservoir R communicate with each other. A damping valve V that, and a partition wall member 14.

  The rod side chamber R1, the piston side chamber R2 and the reservoir R are filled with hydraulic oil as a liquid, and the reservoir R is filled with gas in addition to the hydraulic oil. In addition to the hydraulic oil, any liquid that can exhibit a damping force can be used.

  When the shock absorber is contracted, the piston 2 moves downward in FIG. 1 to compress the piston side chamber R2, and the hydraulic oil in the piston side chamber R2 moves to the rod side chamber R1 via the rectifying passage 8. At the time of this contraction operation, the piston rod 3 enters the cylinder 1, so that the hydraulic oil corresponding to the rod entry volume becomes excessive in the cylinder 1, and the excess hydraulic oil is pushed out of the cylinder 1 and stored in the reservoir via the discharge passage 4. Discharged to R. Since the damping valve V provides resistance to the flow of hydraulic oil that passes through the discharge passage 4 and moves to the reservoir R, the pressure in the cylinder 1 rises, and the shock absorber suppresses the downward movement of the piston 2. Demonstrate the compression side damping force.

  On the contrary, when the shock absorber is extended, the piston 1 moves upward in FIG. 1 to compress the rod side chamber R1, and the hydraulic oil in the rod side chamber R1 moves to the reservoir R through the discharge passage 4. . And since the damping valve V gives resistance to the flow of hydraulic fluid that passes through the discharge passage 4 and moves to the reservoir R, the pressure in the rod side chamber R1 rises. Further, at the time of the extension operation, the piston 1 moves upward and the volume of the piston side chamber R <b> 2 is expanded, and hydraulic oil corresponding to the expanded portion is supplied from the reservoir R through the suction passage 7. Therefore, a difference occurs between the pressures of the rod side chamber R1 and the piston side chamber R2, and this differential pressure acts on the piston 2, so that the shock absorber exhibits an extension side damping force that suppresses the upward movement of the piston 2.

  From the above, when the shock absorber exhibits an expansion / contraction operation, the hydraulic oil is discharged from the cylinder 1 through the discharge passage 4 to the reservoir R, and the hydraulic oil sequentially passes the piston side chamber R2, the rod side chamber R1, and the reservoir R one by one. It is a uniflow type shock absorber that circulates in traffic. In this shock absorber, the damping force on both sides of the pressure expansion is generated by a single damping valve V. In addition, by setting the cross-sectional area of the piston rod 3 to be a half of the cross-sectional area of the piston 2, the amount of hydraulic oil discharged from the cylinder 1 can be set equal on both sides of the pressure expansion with the same amplitude. If the resistance applied to the flow by the damping valve V is the same, the damping force on the expansion side and the compression side can be set to be the same.

  In more detail, the upper end of the cylinder 1 is closed by a rod guide 9 that is annular and slidably supports the outer periphery of the piston rod 3 inserted inside, and the lower end of the cylinder 1 is closed by the bottom member 10. It is blocked by The bottom member 10 is provided with a suction passage 7 that allows the reservoir R and the piston-side chamber R2 to communicate with each other. The rectifying passage 8 is provided in the piston 2 and communicates the piston side chamber R2 with the rod side chamber R1. The rectifying passage 8 may be provided in addition to the piston 2, and may be provided outside the piston rod 3 or the cylinder 1, for example.

  Further, a through hole 1a is provided in the vicinity of the upper end of the cylinder 1 in FIG. 1, and the rod side chamber R1 and the discharge passage 4 are communicated with each other through the through hole 1a. The inner tube 5 is provided with a sleeve 5 a provided in the vicinity of the lower end in FIG. 1 so as to protrude to the outer peripheral side, and the inside of the sleeve 5 a communicates with the discharge passage 4 in the inner tube 5. Thus, in the shock absorber according to the present embodiment, the sleeve 5a forms an opening that communicates with the inner tube 5 inward.

  The outer tube 6 is provided in the vicinity of the lower end in FIG. 1 and provided with a tube body 6a having a hole 6b facing the sleeve 5a that forms the opening of the inner tube 5, and protruding to the side of the tube body 6a. And a cylindrical guide portion 6c surrounding the hole 6b.

  The inner and outer diameters of the sleeve 5a forming the opening are set to be smaller than the inner diameter of the hole 6b and the inner diameter of the guide portion 6c. A valve assembly 11 having a damping valve V is fitted to the inner periphery of the sleeve 5a. The valve assembly 11 includes a damping valve V on the inside, and includes a small-diameter portion 11a provided at the tip, and a large-diameter portion 11b connected to the small-diameter portion 11a and having an outer diameter larger than the outer diameter of the small-diameter portion 11a. I have.

  The valve assembly 11 has a bottomed cylindrical shape that is screwed onto the outer periphery of the guide portion 6c with the small diameter portion 11a fitted into the sleeve 5a and the large diameter portion 11b inserted into the guide portion 6c. The cap 12 is fixed to the inner tube 5 and the outer tube 6.

  Further, in this case, the damping valve V is provided in the middle of the damping passage 11c that opens from the tip of the valve assembly 11 and leads to the left end in FIG. 1 of the large diameter portion 11b. One end of the attenuation passage 11c communicates with the discharge passage 4, and the other end communicates with the reservoir R. The discharge passage 4 and the reservoir R communicate with each other.

  The damping valve V is an electromagnetic valve provided with a solenoid, and resistance is given to the hydraulic oil flowing through the damping passage 11c from the discharge passage 4 toward the reservoir R, and this resistance can be adjusted by a current applied to the solenoid. It has become. The damping valve V configured as described above can adjust the damping force generated by the shock absorber according to the energization amount to the solenoid. Although a specific configuration of the damping valve V is omitted, the damping valve V can be a damping valve with an arbitrary configuration capable of adjusting the damping force.

  The shock absorber includes a partition member 14 in the reservoir R as shown in FIG. As shown in FIGS. 1 to 5, the partition member 14 has a rectangular plate curved in an arc shape so as to be sandwiched between the inner tube 5 and the outer tube 6. Then, a groove 15 that opens from the left end side and extends to the vicinity of the center and a groove 16 that opens from the left end side and extends to the vicinity of the center are formed above the inner periphery 14a on the inner tube 5 side in the partition member 14 in FIG. Has been. As shown in FIGS. 2 and 5, the outer periphery 14 b of the partition wall member 14 on the outer tube 6 side has a recess 17 that opens to the lower end and extends upward, and a U-shaped groove that surrounds except for the opening of the recess 17. 18 and a seal member 19 attached to the U-shaped groove 18 are provided.

  Further, the partition member 14 includes a hole 20 that opens from the inner periphery 14 a and penetrates into the recess 17. The inner diameter of the hole 20 is set larger than the outer diameter of the sleeve 5 a of the inner tube 5. Yes. The recess 17 is a rectangular recess whose upper end is semicircular and whose lower end side is a semicircle, and the diameter of the semicircle on the upper end side is larger than the diameter of the hole 6b provided in the outer tube 6. It is. Grooves 15 and 16 are provided on the inner periphery 14 a of the partition member 14, and a recess 17 and a U-shaped groove 18 are provided on the outer periphery 14 b, but the grooves 15 and 16 include the recess 17 and the U-shaped groove 18. It avoids and is arranged above these. Since the grooves 15 and 16 are provided so as to avoid the concave portion 17 and the U-shaped groove 18 where the thickness of the partition member 14 is reduced, the strength of the partition member 14 is ensured. The partition member 14 may be made of a synthetic resin or rubber having elasticity in addition to metal, and in the case of rubber, the seal member 19 is provided instead of mounting the seal member 19. You may make it provide the rib which protrudes and sticks to the outer tube 6 in a position.

  And this partition member 14 is positioned by the ring 21 with which the outer periphery of the inner tube 5 is mounted | worn with the annular groove 5b provided in FIG. 1 above the sleeve 5a. The ring 21 is a C-shaped ring provided with a notch portion at one place, and both ends are accommodated in the grooves 15 and 16 of the partition wall member 14 and attached.

  In order to position the partition member 14 configured in this manner on the outer periphery of the inner tube 5, the following is performed. First, as shown in FIG. 6, the ring 21 is mounted in the annular groove 5b of the inner tube 5 with the notch between the notches 21a and 21b facing the opening of the inner tube 5 through which the damping valve V is inserted.

  Subsequently, the inner circumference 14 a of the partition wall member 14 is brought into contact with the outer circumference of the inner tube 5 while inserting one end side of the ring 21 into the groove 15 and the other end side of the ring 21 into the groove 16.

  Then, the partition member 14 is positioned in the axial direction with respect to the inner tube 5 by the movement of the inner tube 5 in the axial direction by the ring 21 inserted in the grooves 15 and 16. When the ring 21 is inserted into the grooves 15 and 16, the end face 15a of the groove 15 and the end face of the notch end 21a of the ring 21 face each other, and the end face 16a of the groove 16 and the notch end 21b of the ring 21 The end face is opposite. Then, even if the partition member 14 is moved in the circumferential direction with respect to the inner tube 5, it interferes with the end surface of the notch end 21 a of the ring 21 and the end surface 15 a of the groove 15, or the end surface of the notch end 21 b of the ring 21 and the groove The movement is restricted by interference with the 16 end faces 16a or both. Therefore, the partition member 14 is also positioned in the circumferential direction with respect to the inner tube 5 by the ring 21.

  When the partition member 14 thus positioned on the inner tube 5 is inserted into the outer tube 6 together with the inner tube 5, the partition member 14 does not move to the inner tube 5 in the axial direction or in the circumferential direction. It is accommodated in the outer tube 6.

  Therefore, when the partition member 14 is assembled to the inner tube 5 and the outer tube 6, the partition member 14 can be assembled at an appropriate position. As described above, when the partition member 14 is assembled to the inner tube 5 and the outer tube 6, the partition member 14 is sandwiched between the inner tube 5 and the outer tube 6 and fixed to both. At that time, the seal member 19 is pressed against and closely adhered to the inner peripheral surface of the outer tube 6, and the partition member 14 is urged toward the outer peripheral surface of the inner tube 5 by elastic deformation of the seal member 19, The inner tube 5 and the outer tube 6 are firmly fixed.

  The hole 18 faces the opening of the inner tube 5, and the sleeve 5 a can be welded to the inner tube 5 through the hole 6 b of the outer tube 6. When the valve assembly 11 is inserted into the sleeve 5 a thus provided, the valve assembly 11 is inserted into the hole 20 of the partition wall member 14.

  Further, the recess 17 is opposed to the hole 6 b in the outer tube 6, and a flow path F is formed between the inner periphery of the outer tube 6. In this flow path F, the concave portion 17 is opened at the lower end of the partition wall member 14, and the downstream of the attenuation passage 11c is communicated to the lower side of the reservoir R. The hydraulic oil passing through the attenuation valve V is stored in the reservoir R. The hydraulic oil is guided to the side opposite to the oil level S. Since the concave portion 17 is surrounded by the seal member 19 and the seal member 19 is in close contact with the outer tube 6, the hydraulic oil that has passed through the damping valve V and is discharged to the flow path F flows from the flow path F to the partition wall member 14. It flows into the lower part of the reservoir R without leaking in the circumferential direction.

  In the shock absorber configured as described above, when hydraulic oil is pushed out from the cylinder 1 to the discharge passage 4 by contraction of the shock absorber, as shown in FIG. 1, the damping valve V, the partition member 14 and the outer tube 6 flows into the reservoir R through the flow path F formed between the two. The hydraulic oil that has been jetted after passing through the damping valve V in this way flows into the reservoir R through the flow path F that is provided in the downward direction opposite to the oil level S. Since the jet flows in the direction opposite to the oil level S of the reservoir R, the oil level S is not disturbed to cause a phenomenon that the gas is agitated, so that the gas can be prevented from being mixed into the hydraulic oil. As described above, according to the shock absorber of the present invention, the gas can be prevented from being mixed into the hydraulic oil, so that the disturbance of the damping waveform of the shock absorber can be eliminated. Further, since it is not necessary to increase the amount of hydraulic oil in the reservoir R in order to keep the oil level S in the reservoir R away from the damping valve V in order to prevent gas mixture in the hydraulic oil, the total length of the shock absorber Longer length is not required. Therefore, according to the shock absorber of the first embodiment, the disturbance of the attenuation waveform can be eliminated without requiring an increase in the total length.

  Furthermore, in the shock absorber according to the present invention, the partition member 14 is positioned on the inner tube 5 by the ring 21, so that the partition member 14 can be positioned at an appropriate position with respect to both the inner tube 5 and the outer tube 6. .

  In the shock absorber in this example, since the partition member 14 is positioned by the ring 21, the partition member 14 is positioned not only in the axial direction but also in the circumferential direction with respect to the inner tube 5. 14, the partition member 14 stays in an appropriate position when assembled to the inner tube 5 and the outer tube 6, so that the assembling property is good and the assembling can be easily performed.

  Further, since the partition member 14 is sandwiched and fixed between the inner tube 5 and the outer tube 6, parts for fixing the partition member 14 are not necessary, which is advantageous in terms of cost.

  Further, a seal member that opens to the outer periphery on the outer tube side of the partition wall member 14 and surrounds the outer tube 6 except for the recess 17 and the recess 17 that forms the flow path F between the outer tube 6 and the outer tube 6. 19 is provided. In this way, the jet flow discharged from the damping valve V leaks from the flow path F in the circumferential direction of the partition wall member 14 and does not flow out to the reservoir R, so that the gas entrainment prevention effect is improved.

  In addition, the partition member 14 may be positioned in the inner tube 5 in the axial direction by making the ring an annular shape having no notch in addition to the ring 21. In that case, the groove provided in the partition member 14 may be formed as one groove that communicates from one circumferential end to the other circumferential end of the inner periphery 14 a of the partition member 14.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Piston, 3 ... Piston rod, 4 ... Discharge passage, 5 ... Inner tube, 6 ... Outer tube, 6c ... Guide part, 7 ...・ Suction passage, 8 ... Rectification passage, 11 ... Valve assembly, 13, 14, 16 ... Collar, 13c, 14c, 16c ... Notch, 14d ... Step, 15, 18, 20 ... flow path forming member, 17 ... fixing member, 20a ... fitting ring, 20b ... flow path forming wall, 20c, 20d ... support piece, 20e ... connection part, 21 ... Ring, F ... Flow path, R ... Reservoir, R1 ... Rod side chamber, R2 ... Piston side chamber, S ... Oil level (liquid level), V ... Dampening valve

Claims (7)

An inner tube having an opening on the side;
An outer tube that covers the outer side of the inner tube, forms an annular reservoir with the inner tube, and has a cylindrical guide portion that is provided on a side and that communicates with the reservoir facing the opening; ,
A valve assembly that has a damping valve that provides resistance to the flow of liquid from the inner tube toward the reservoir, and is fitted into the opening of the inner tube and inserted into the guide portion;
A partition member that is provided in the reservoir and guides the liquid that has passed through the damping valve to the side opposite to the liquid level of the liquid in the reservoir;
The shock absorber according to claim 1, wherein the partition member is positioned by a ring attached to an outer periphery of the inner tube. The ring has a notch;
In the partition member, the ring has a mounting groove on the inner tube side, and is positioned in the axial direction with respect to the inner tube by mounting in the groove of the ring, and the inner tube by the notched end of the notched portion. The shock absorber according to claim 1, wherein the shock absorber is positioned in a circumferential direction. The ring is formed in an annular shape,
The said partition member has a groove | channel where the said ring is mounted | worn on the said inner tube side, and is positioned to an axial direction with respect to the said inner tube by mounting | wearing to the groove | channel of the said ring. Shock absorber. The shock absorber according to any one of claims 1 to 3, wherein the partition member is sandwiched and fixed between the inner tube and the outer tube. The partition member is
A recess that is provided on the outer tube side and that opens to the lower end and forms a flow path that leads the liquid that has passed through the damping valve between the outer tube and the liquid surface in the reservoir to the opposite side of the liquid surface;
A hole penetrating from the inner tube side to the recess and allowing the valve assembly to be inserted;
The shock absorber according to any one of claims 1 to 4, further comprising: a seal member that is provided on the outer tube side and surrounds except for the opening of the concave portion and closely contacts the outer tube. The partition member is formed of rubber.
A recess that is provided on the outer tube side and that opens to the lower end and forms a flow path that leads the liquid that has passed through the damping valve between the outer tube and the liquid surface in the reservoir to the opposite side of the liquid surface;
A hole penetrating from the inner tube side to the recess and allowing the valve assembly to be inserted;
The shock absorber according to any one of claims 1 to 4, further comprising a rib that is provided on the outer tube side and surrounds the outer tube except for the opening of the recess and closely contacts the outer tube. A cylinder provided inside the inner tube;
A piston rod movably inserted into the cylinder;
A piston that is movably inserted into the cylinder and connected to the piston rod and that defines a rod-side chamber and a piston-side chamber in the cylinder, and an annular gap between the cylinder and the inner tube. A discharge passage communicating with the rod side chamber;
A suction passage that allows only a flow of liquid from the reservoir toward the piston side chamber;
The shock absorber according to any one of claims 1 to 6, further comprising a rectifying passage that allows only a liquid flow from the piston side chamber toward the rod side chamber.

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