Hydraulic draft gear

Abstract

To provide a hydraulic draft gear which appropriately generates an attenuation force at the time of compression start after full extension of a piston rod while mitigating the impact of full extension with a simple configuration.SOLUTION: A hydraulic draft gear 10 includes: a rod guide 21 which slidably guides a piston rod 11 that moves frontward and backward in an oil chamber 14 in a cylinder 12, the rod guide 21 defining a rebound oil chamber 20 which generates an attenuation force at the time of full extension of the piston rod 11; a rebound stopper 19 fixed to the piston rod 11; and a rebound valve 23 which enters the rebound oil chamber 20 at the time of full extension of the piston rod 11. The rebound valve 23 is attached so as to be slightly movable in an axial direction D of the piston rod 11 with respect to the rebound stopper 19. The hydraulic draft gear 10 includes a first flow path P1 of oil liquid for releasing a pressure in the rebound oil chamber 20 at the time of compression start after the full extension of the piston rod 11.SELECTED DRAWING: Figure 7D

Description

[Technical Field]

[0001] The present invention relates to a hydraulic shock absorber used in vehicles such as passenger cars, trucks, and motorcycles. [Background technology]

[0002] In conventional hydraulic shock absorbers, the impact noise generated when the piston rod is fully extended is a cause of discomfort to occupants. However, providing a structure to absorb the impact when the piston rod is fully extended makes the structure complex and limits the internal dimensions.

[0003] As a hydraulic shock absorber that uses a simple configuration to reduce the impact when the piston rod is fully extended, a hydraulic shock absorber has been proposed that has a stopper member that abuts against the extension restriction member when the piston rod is fully extended, and part or all of this stopper member is inserted into the insertion recess of the extension restriction member while generating a hydraulic damping effect (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-263132 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in a hydraulic shock absorber in which the stopper member blocks the insertion recess of the extension-limiting member when the piston rod is fully extended, the pressure in the insertion recess of the extension-limiting member is not easily released when the piston rod starts to compress from its fully extended state. As a result, a strong damping force is generated when the piston rod starts to compress after being fully extended, making it impossible to generate an appropriate compression-side damping force.

[0006] An object of the present invention is to provide a hydraulic shock absorber with a simple configuration that can generate an appropriate damping force when compression begins after full extension while mitigating the impact when the piston rod is fully extended. [Means for solving the problem]

[0007] In one aspect, a hydraulic shock absorber includes a cylinder having an oil chamber formed therein for oil, a piston rod that moves back and forth in the oil chamber, a piston valve fixed to the tip of the piston rod and sliding along the inner surface of the cylinder while defining the oil chamber, a rod guide that slidably guides the piston rod and forms a rebound oil chamber that generates a damping force when the piston rod is fully extended, a rebound stopper fixed to the piston rod, and a rebound valve that enters the rebound oil chamber when the piston rod is fully extended. The rebound valve is attached to the rebound stopper so as to be slightly movable in the axial direction of the piston rod, and includes a first oil flow path for releasing pressure in the rebound oil chamber when the piston rod starts to compress after being fully extended. [Effects of the Invention]

[0008] According to the above aspect, with a simple configuration, it is possible to reduce the impact when the piston rod is fully extended and to generate an appropriate damping force when compression starts after the piston rod is fully extended. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing a hydraulic shock absorber according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a rebound valve according to an embodiment. [Figure 3] FIG. 2 is a perspective view showing a rod guide according to an embodiment. [Figure 4] FIG. 2 is a cross-sectional view showing a rod guide according to an embodiment. [Figure 5] FIG. 10 is a cross-sectional view showing a rod guide according to a modified example of the embodiment. [Figure 6] 1 is a cross-sectional view showing a hydraulic shock absorber (fully extended state) according to an embodiment. [Figure 7A] FIG. 1 is a cross-sectional view (part 1) showing a rebound valve in a stroke extension process according to an embodiment. [Figure 7B] FIG. 4 is a second cross-sectional view showing the rebound valve in the stroke extension process in the embodiment. [Figure 7C] FIG. 10 is a third cross-sectional view showing the rebound valve in the stroke extension process in the embodiment. [Figure 7D] FIG. 4 is a cross-sectional view showing a rebound valve during a compression stroke in one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hydraulic shock absorber according to an embodiment of the present invention will now be described with reference to the drawings.

[0011] FIG. 1 is a cross-sectional view showing a hydraulic shock absorber 10 according to one embodiment.

[0012] As shown in FIG. 1, the hydraulic shock absorber 10 includes a piston rod 11, a cylinder 12, an outer cylinder 13, an oil chamber 14, a reservoir chamber 15, a piston valve 16, a bottom stopper 17, a base valve 18, a rebound stopper 19, a rebound oil chamber 20, a rod guide 21, a rebound valve 23, an attachment portion 24, a bump stopper 25, and an oil seal 26.

[0013] The piston rod 11 is held at its upper part by a bearing of the vehicle (not shown) so as to be slidable in the axial direction D. The piston rod 11 is inserted at its lower part into a cylinder 12 and moves back and forth in an oil chamber 14 inside the cylinder 12. In this specification, the side of the axial direction D of the piston rod 11 where the piston rod 11 extends from the cylinder 12 is referred to as the upper side (upper side), and the opposite side is referred to as the lower side (lower side). However, these upper and lower directions may differ depending on the inclination of the hydraulic shock absorber 10 and whether it is positioned upright or inverted.

[0014] The cylinder 12 is housed in an outer cylinder 13. The cylinder 12 has an oil chamber 14 formed therein for storing oil.

[0015] As described above, the outer cylinder 13 houses the cylinder 12 and is fixed to a vehicle (not shown). The upper side of the outer cylinder 13 is formed to be longer than the cylinder 12 in the axial direction D of the piston rod 11.

[0016] The oil chamber 14 is formed inside the cylinder 12 and filled with oil. The oil chamber 14 is divided into an upper oil chamber 14a and a lower oil chamber 14b by a piston valve 16, which will be described later.

[0017] The reservoir chamber 15 is a space between the inner peripheral surface of the outer cylinder 13 and the outer peripheral surface of the cylinder 12, and is filled with oil and gas.

[0018] The piston valve 16 is fixed to the tip (the lower end, which is the end on the mounting portion 24 side) of the piston rod 11, and slides along the inner circumferential surface of the cylinder 12 while dividing the oil chamber 14 into the upper oil chamber 14a and the lower oil chamber 14b as described above. Then, a damping force is generated during the extension stroke and the compression stroke of the hydraulic shock absorber 10 depending on the flow path through which the oil in the oil chamber 14 passes through the piston valve 16.

[0019] The bottom stopper 17 is formed in a dish shape, and its outer periphery is fitted into the inner periphery of the lower end of the outer cylinder 13. The bottom stopper 17 seals the bottom of the outer cylinder 13 from the outside and holds the base valve 18.

[0020] The base valve 18 generates a damping force during the compression stroke of the hydraulic shock absorber 10 in accordance with the flow path through which the oil passes between the oil chamber 14 and the reservoir chamber 15.

[0021] The rebound stopper 19 has a cylindrical shape and is fixed to the piston rod 11 by, for example, crimping. The rebound stopper 19 has a large-diameter flange portion 19a provided at its upper end. Note that the rebound stopper 19 may be fixed to the piston rod 11 by any other method, such as resistance welding.

[0022] The rebound oil chamber 20 is formed inside a rod guide 21, which will be described later, and communicates with the upper part of the upper oil chamber 14a.

[0023] The rod guide 21 slidably guides the piston rod 11 and forms a rebound oil chamber 20 that generates a damping force when the piston rod 11 is fully extended. As shown in Figures 3 and 4, the rod guide 21 has a rod guide main body 21a, a skirt portion 21b, and a flange portion 21c. The rod guide 21 is fitted into the inner peripheral surface of the upper end of the cylinder 12 at the outer peripheries of the rod guide main body 21a and the skirt portion 21b.

[0024] The rod guide body 21a has a cylindrical shape and guides the piston rod 11 so that it can slide freely.

[0025] The skirt portion 21b is integrally formed with the rod guide main body 21a and has the same outer diameter as the rod guide main body 21a, but has an inner diameter d2 larger than the inner diameter d1 of the rod guide main body 21a, as shown in Fig. 4. That is, the skirt portion 21b extends toward the rebound stopper 19 (downward) along the inner circumferential surface of the cylinder 12, and forms a rebound oil chamber 20 inside.

[0026] The flange portion 21c is a large-diameter portion provided at the upper end of the rod guide main body 21a, and extends radially from the rod guide main body 21a along the upper end of the cylinder 12.

[0027] Meanwhile, a second flow path P2 shown in Fig. 7B is provided between the inner peripheral surface of the skirt portion 21b of the rod guide 21 and the outer peripheral surface of the rebound valve 23 (described later), and the second flow path P2 is defined by the difference between the inner diameter of the skirt portion 21b and the outer diameter of the rebound valve 23. This second flow path P2 functions as a flow path for releasing oil from the rebound oil chamber 20 toward the upper oil chamber 14a when the rebound valve 23 enters the inside of the skirt portion 21b (rebound oil chamber 20) just before the piston rod 11 reaches its fully extended state. Therefore, the damping force is adjusted according to the flow path (cross-sectional area, etc.) of the second flow path P2.

[0028] 3 and 4, a notch 21d may be provided at the lower end of the inner circumferential surface of the skirt portion 21b to expand the second flow path P2 when the rebound valve 23 enters the rebound oil chamber 20. This notch 21d may extend from the lower end of the inner circumferential surface of the skirt portion 21b to any position, such as the vertical center of the skirt portion 21b. The width (cross-sectional area) of the notch 21d in the circumferential direction of the skirt portion 21b may be gradually reduced from the lower end of the inner circumferential surface of the skirt portion 21b toward the top of the skirt portion 21b.

[0029] In order to expand the second flow path P2 when the rebound valve 23 enters the rebound oil chamber 20, a notch may be provided in the upper end of the outer circumferential surface of the rebound valve 23 instead of the notch 21d (or in addition to the notch 21d). In this case, too, it is preferable that the notch of the rebound valve 23 has a width (cross-sectional area) in the circumferential direction of the rebound valve 23 that gradually decreases downward from the upper end of the outer circumferential surface of the rebound valve 23.

[0030] In the rod guide 21 shown in FIGS. 3 and 4 above, the rod guide main body 21a (and flange portion 21c) and skirt portion 21b are integral with each other, but as in the rod guide 22 shown in FIG. 5, the rod guide main body 22a and skirt portion 22b may be provided separately. In this case, the skirt portion 22b may be fitted into the lower end of the rod guide main body 22a. The other configurations of the rod guide 22 can be the same as those of the rod guide 21. Therefore, the rod guide 22 may also have a notch 22d in the skirt portion 22b.

[0031] The rebound valve 23 enters the rebound oil chamber 20 when the piston rod 11 is fully extended. As shown in Fig. 2, the rebound valve 23 is ring-shaped. The rebound valve 23 is provided with a plurality of extension portions 23a that extend from the periphery of the rebound valve 23 toward the piston valve 16 (lower side) at intervals in a plurality of locations in the circumferential direction. In the example of Fig. 2, a total of four extension portions 23a are provided at positions spaced apart in the circumferential direction by 90 degrees.

[0032] The rebound valve 23 also has claws 23b that protrude from the tip (lower end) of each of the multiple extensions 23a toward the piston rod 11 (toward the radial center). The claws 23b hold the rebound stopper 19 (flange portion 19a) so that the rebound valve 23 can move slightly in the axial direction D (across a gap G in the axial direction D, shown in FIG. 7A , which allows for slight movement). Note that the inner diameter of the rebound valve 23 (excluding the extensions 23a) is larger than the outer diameter of the piston rod 11, so that the rebound valve 23 can move slightly not only in the axial direction D but also in a direction inclined relative to the axial direction D.

[0033] For example, six grooves 23c are provided on the upper surface of the rebound valve 23. The grooves 23c extend radially at intervals in the circumferential direction of the rebound valve 23.

[0034] A first flow path P1 (see FIG. 7D ) is provided between the inner circumferential surface of the rebound valve 23 (excluding the extension portion 23 a) and the outer circumferential surface of the piston rod 11. This first flow path P1 functions as a flow path for hydraulic fluid to release the pressure in the rebound oil chamber 20 when the piston rod 11 starts to compress after being fully extended. This first flow path P1 is blocked by a rebound stopper 19 during the stroke extension process. Note that the circumferential spaces between the multiple extension portions 23 a of the rebound valve 23 also function as the first flow path P1. Note that instead of a flow path between the inner circumferential surface of the rebound valve 23 (excluding the extension portion 23 a) and the outer circumferential surface of the piston rod 11, a through-hole or the like provided in the rebound valve 23 parallel to the piston rod 11 (axial direction D) may be used. This through-hole may also be blocked by the rebound stopper 19 or the like during the stroke extension process.

[0035] The rebound valve 23 is preferably made of an elastic body such as rubber and is detachably attached to the rebound stopper 19. Preferably, the area surrounded by the plurality of claw portions 23b is narrower than the flange portion 19a of the rebound stopper 19, and the rebound valve 23 is attached to the flange portion 19a (rebound stopper 19) while the plurality of claw portions 23b (extension portions 23a) are spread out in the radial direction.

[0036] The mounting portion 24 is located at the lower end of the hydraulic shock absorber 10 and has a cylindrical shape with its central axis perpendicular to the axial direction D of the piston rod 11. The mounting portion 24 is used, for example, to mount the hydraulic shock absorber 10 on the wheel side of a vehicle (not shown).

[0037] The bump stopper 25 has its inner periphery fitted into the outer periphery of the upper end of the outer cylinder 13. The piston rod 11 is inserted into the center of the bump stopper 25.

[0038] The oil seal 26 is disposed inside the bump stopper 25 and above the rod guide 21. The oil seal 26 seals the upper end of the outer cylinder 13.

[0039] Next, the stroke extension process (FIGS. 7A to 7C) and the stroke extension process (FIG. 7D) before and after the piston rod 11 reaches the fully extended state (see the hydraulic shock absorber 10 shown in FIG. 6) will be described.

[0040] As shown in FIG. 7A, during the stroke extension stroke, the piston rod 11 moves upward, and the rebound stopper 19 fixed to the piston rod 11 pushes up the rebound valve 23 within its slightly movable range. As a result, a gap G in the axial direction D between the rebound stopper 19 and the rebound valve 23 is located below the flange portion 19a. In FIG. 7A, unlike in FIGS. 7B to 7D, the groove 23c does not appear on the top surface of the rebound valve 23, but the position of the rebound valve 23 in the rotational direction may be the same in FIG. 7A and FIGS. 7B to 7D. Note that the rebound valve 23 is not restricted from rotating around the piston rod 11, and therefore can rotate around the piston rod 11, particularly before the rebound valve 23 enters the rebound oil chamber 20.

[0041] Thereafter, as shown in FIG. 7B, the rebound valve 23 enters the rebound oil chamber 20, and the oil in the rebound oil chamber 20 flows from the second flow path P2 (the gap between the inner circumferential surface of the skirt portion 21b of the rod guide 21 (see inner diameter d2 in FIG. 4) and the outer circumferential surface of the rebound valve 23) to the upper oil chamber 14a, generating a damping force. As described above, this second flow path P2 includes the notch 21d of the rod guide 21 shown in FIGS. 3 and 4. Note that, because there is a gap between the inner circumferential surface of the rebound valve 23 and the outer circumferential surface of the piston rod 11 that is the same size as the first flow path P1 (see FIG. 7D), when the outer circumferential surface of the rebound valve 23 enters the rebound oil chamber 20, it is guided by the inner circumferential surface of the skirt portion 21b, thereby enabling centering of the rebound valve 23.

[0042] As shown in FIG. 7C, when the piston rod 11 is fully extended, the upper surface of the rebound valve 23 comes into contact with the rod guide main body 21a, and the rebound oil chamber 20 disappears (in reality, oil remains in some parts of the groove 23c on the upper surface of the rebound valve 23).

[0043] 7D, when compression begins after the piston rod 11 is fully extended, oil flows into the rebound oil chamber 20 through the first flow path P1, i.e., the flow path in the circumferential space of the rebound valve 23 between the multiple extension portions 23a, and the flow path between the inner circumferential surface of the rebound valve 23 (excluding the extension portions 23a) and the outer circumferential surface of the piston rod 11. This releases the pressure in the rebound oil chamber 20 when compression begins after the piston rod 11 is fully extended. Note that during the stroke extension stroke, the rebound stopper 19 pushes up the rebound valve 23, blocking the flow path between the inner circumferential surface of the rebound valve 23 (excluding the extension portions 23a) and the outer circumferential surface of the piston rod 11. However, during the stroke compression stroke, the rebound stopper 19 pushes down the rebound valve 23, leaving the flow path open by a gap G for the slight movement of the rebound valve 23.

[0044] In the above description, the hydraulic shock absorber 10 is described as being of a double-cylinder type, but it may also be of a single-cylinder type. Furthermore, except for the features that will be described later, the configuration of the hydraulic shock absorber 10 can be changed as appropriate.

[0045] In the present embodiment described above, the hydraulic shock absorber 10 includes a cylinder 12 having an oil chamber 14 formed therein for oil, a piston rod 11 that moves back and forth in the oil chamber 14, a piston valve 16 that is fixed to the tip of the piston rod 11 and slides along the inner circumferential surface of the cylinder 12 while defining the oil chamber 14, a rod guide 21 that slidably guides the piston rod 11 and forms a rebound oil chamber 20 that generates a damping force when the piston rod 11 is fully extended, a rebound stopper 19 fixed to the piston rod 11, and a rebound valve 23 that enters the rebound oil chamber 20 when the piston rod 11 is fully extended. The rebound valve 23 is attached to the rebound stopper 19 so as to be slightly movable in the axial direction D of the piston rod 11, and includes a first oil flow path P1 for releasing the pressure in the rebound oil chamber 20 when the piston rod 11 starts to compress after being fully extended.

[0046] In this way, the entry of the rebound valve 23 into the rebound oil chamber 20 allows a damping force to be generated when the piston rod 11 is fully extended. Furthermore, when the piston rod 11 starts to compress after fully extended, the rebound stopper 19, to which the rebound valve 23 is attached so as to be slightly movable in the axial direction D, instantaneously moves downward by the gap G prior to the rebound valve 23, thereby releasing the pressure in the rebound oil chamber 20 through the first flow path P1. Therefore, when the piston rod 11 starts to compress after fully extended, the rebound valve 23 is more likely to retract from the rebound oil chamber 20, allowing the piston valve 16, base valve 18, etc. to appropriately generate a compression-side damping force without generating a strong damping force by the rebound valve 23. Thus, according to this embodiment, with a simple configuration, an appropriate damping force can be generated when the piston rod 11 starts to compress after fully extended while absorbing the impact when the piston rod 11 is fully extended.

[0047] In this embodiment, the rod guide 21 includes a skirt portion 21b that extends along the inner circumferential surface of the cylinder 12 toward the rebound stopper 19 and forms the rebound oil chamber 20.

[0048] This allows the rebound oil chamber 20, which generates a damping force when the piston rod 11 is fully extended, to be provided with a simple structure.

[0049] In a modification of this embodiment, the rod guide 22 includes a rod guide body 22a that slidably guides the piston rod 11, and a skirt portion 22b that is provided separately from the rod guide body 22a.

[0050] This allows the skirt portion 22b to be easily provided, and also makes it possible to adjust the damping force during the stroke extension process by replacing the skirt portion 22b with another skirt portion 22b that has a different length in the axial direction D or an inner diameter d2.

[0051] In this embodiment, the rebound valve 23 is positioned so as to separate the second flow path P2 between the outer circumferential surface and the inner circumferential surface of the skirt portion 21b.

[0052] This allows the damping force to be generated when the piston rod 11 is fully extended while allowing oil to escape from the rebound oil chamber 20 with a simple configuration.

[0053] In addition, in this embodiment, a notch 21d is provided between the outer peripheral surface of the rebound valve 23 and the inner peripheral surface of the skirt portion 21b, which expands the second flow path P2 when the rebound valve 23 enters the rebound oil chamber 20.

[0054] This allows the rebound valve 23 to easily enter the rebound oil chamber 20 during the stroke extension process, making it possible to generate an appropriate damping force.

[0055] In addition, in this embodiment, the rebound valve 23 includes a plurality of extension portions 23a that are provided at intervals at multiple locations in the circumferential direction and extend from the periphery toward the piston valve 16 side (downward), and claw portions 23b that protrude from the tip of each of the plurality of extension portions 23a toward the piston rod 11 and hold the rebound stopper 19 so that it can move slightly in the axial direction D.

[0056] This allows the rebound valve 23 to move slightly toward the rebound stopper 19 by the gap G with a simple configuration that embraces the rebound stopper 19. Therefore, when the piston rod 11 starts to compress after being fully extended, the rebound stopper 19 moves downward by the gap G ahead of the rebound valve 23, and the rebound stopper 19 can retreat from the position where it blocks the first flow path P1.

[0057] In this embodiment, the rebound valve 23 is made of an elastic body and is detachably attached to the rebound stopper 19 .

[0058] This allows the rebound valve 23 to be replaced with another rebound valve 23 having different flow path cross-sectional areas for the first flow path P1, which generates a damping force during the stroke extension stroke, and the second flow path P2, which generates a damping force during the stroke compression stroke, thereby adjusting the damping force. Furthermore, it is easy to attach a new rebound valve 23 to the rebound stopper 19 (hydraulic shock absorber 10), remove the rebound valve 23, or replace it with a rebound valve 23 that has a small outer diameter that is in contact with the rod guide main body 21a of the rod guide 21 so that the damping force of the rebound oil chamber 20 does not act on it. Furthermore, even if the rebound valve 23, which is made of rubber, becomes worn, it can be easily replaced. Furthermore, because the rebound valve 23, which is made of an elastic material, can be easily attached to the rebound stopper 19, the hydraulic shock absorber 10 can be produced inexpensively. [Explanation of symbols]

[0059] 10 Hydraulic shock absorber 11 Piston rod 12 cylinders 13 Outer cylinder 14 Oil room 14a Upper oil chamber 14b Lower oil chamber 15 Reservoir chamber 16 Piston valve 17 Bottom stopper 18 Base valve 19 Rebound Stopper 19a Flange 20 rebound oil chamber 21 Rod guide 21a Rod guide body 21b Skirt section 21c Flange 21d notch 22 Rod guide 22a Rod guide body 22b Skirt section 22c flange 22d cutout 23 Rebound valve 23a Extension 23b Claw part 23c groove 24 Mounting part 25 Bump Stopper 26 Oil seal D-axis direction G Gap P1 First flow path P2 Second flow path

Claims

1. a cylinder having an oil chamber formed therein for oil; a piston rod that moves back and forth within the oil chamber; a piston valve fixed to a tip of the piston rod and sliding along an inner circumferential surface of the cylinder while defining the oil chamber; a rod guide that slidably guides the piston rod and forms a rebound oil chamber that generates a damping force when the piston rod is fully extended; a rebound stopper fixed to the piston rod; a rebound valve that enters the rebound oil chamber when the piston rod is fully extended, The rebound valve is attached to the rebound stopper so as to be slightly movable in the axial direction of the piston rod, and includes a first oil flow path for releasing pressure in the rebound oil chamber when compression begins after the piston rod has fully extended. A hydraulic shock absorber characterized by:

2. The rod guide includes a skirt portion that extends along the inner peripheral surface of the cylinder toward the rebound stopper and forms the rebound oil chamber.

2. The hydraulic shock absorber according to claim 1.

3. The rod guide includes a rod guide body that slidably guides the piston rod, and the skirt portion that is provided separately from the rod guide body.

3. The hydraulic shock absorber according to claim 2.

4. The rebound valve is positioned to define a second flow path between the outer peripheral surface and the inner peripheral surface of the skirt portion.

4. The hydraulic shock absorber according to claim 2 or 3.

5. A notch is provided between the outer circumferential surface of the rebound valve and the inner circumferential surface of the skirt portion, which expands the second flow path when the rebound valve enters the rebound oil chamber.

5. The hydraulic shock absorber according to claim 4.

6. The rebound valve includes a plurality of extension portions that are provided at intervals at a plurality of locations in the circumferential direction and extend from a periphery toward the piston valve, and a claw portion that protrudes from a tip end of each of the plurality of extension portions toward the piston rod and holds the rebound stopper so as to be slightly movable in the axial direction.

2. The hydraulic shock absorber according to claim 1.

7. The rebound valve is made of an elastic body and is detachably attached to the rebound stopper.

2. The hydraulic shock absorber according to claim 1.

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