Hydraulic shock absorber

Abstract

Hydraulic shock absorber (1) comprising: a vehicle body side pipe (11) arranged on a vehicle body side; an axle-side tube (12) arranged on one axle side; a cylinder (15) provided in the axle-side tube (12) and having at least one opening portion (43) in an axle-side side wall surface; a container (26) defined on an outer side of the cylinder (15) and containing oil; a rod (16) provided in the vehicle body side tube (11); a piston (19) provided on an axis side of the rod (16) and sliding with respect to an inner peripheral surface of the cylinder (15); a damping force generating unit (10) which generates a damping force by oil flow due to a movement of the piston (19); and a movement preventing member (51) arranged outside the cylinder (15) and on a vehicle body side of the opening portion (43) and preventing the oil from moving from the axle side to the vehicle body side, wherein a recessed portion (51E) recessed toward the vehicle body side is formed on an axle side surface of the movement preventing member (51) that blocks movement of the oil.

Description

TECHNICAL FIELD

[0001] The present invention relates to a hydraulic shock absorber that absorbs a shock from a road surface. STATE OF THE ART

[0002] As a suspension device for suspending a wheel in a ride-on vehicle, such as a two-wheeled vehicle and a three-wheeled vehicle, a hydraulic shock absorber described in JP 2017-180689 A (published on October 5, 2017) is known, for example, in which a vehicle body-side tube and a wheel-side tube are formed in a telescopic manner. In the hydraulic shock absorber of JP 2017-180689 A, when the wheel receives an impact due to an uneven road surface, the wheel-side tube telescopically moves in and out of the vehicle body-side tube.

[0003] DE 10 2011 000 281 A1 shows a telescopic suspension fork leg with an inner tube and an outer tube and a damping device as well as a spring device which is arranged within a first chamber formed in the outer tube and is supported against a second chamber formed by the damping device and arranged below the first chamber, which is designed to receive a damping fluid, wherein the damping device has a piston supported on a piston rod with an upper and a lower piston surface and the piston is displaceable within a damping tube arranged largely concentrically to the inner tube and the damping tube is surrounded by an annular chamber arranged largely concentrically to the damping tube and the telescopic suspension fork leg has a hydraulic end stop device,which is arranged within the damping device and is designed to generate a spring-travel-dependent damping force and has a pressure-limiting device.

[0004] DE 60 2004 008 149 T2 describes a front wheel fork in a two-wheeled vehicle or similar. A mounting portion for a sleeve, which guides an inner tube, is formed on an upper and a lower side of an outer tube.

[0005] DE 60 2005 005 947 T2 discloses a motorcycle front fork having an auxiliary tank coupled to a lower portion of a wheel-side tube, wherein an inner portion of the auxiliary tank is provided with an auxiliary oil chamber and an auxiliary gas chamber separated from the auxiliary oil chamber by a partition member. A communication path connecting an oil reservoir chamber to the auxiliary oil chamber is provided. Furthermore, an opening and closing valve is provided that closes the communication path while operating with a brake application, a bypass passage that bypasses the communication path and connects the oil reservoir chamber to the auxiliary oil chamber, and a relief valve that opens the bypass passage at a time when a gas chamber reaches a predetermined pressure in a state where the opening and closing valve is closed. SUMMARY OF THE INVENTION TECHNICAL PROBLEM

[0006] However, in the hydraulic shock absorber of JP 2017-180689 A, when a ride-on vehicle in which the hydraulic shock absorber is mounted vibrates in an up-and-down direction, oil in a reservoir may move upward and may not stay near an opening portion leading from the reservoir to the inside of a cylinder. When the hydraulic shock absorber is rapidly rebounded in this situation, the amount of oil supplied to the inside of the cylinder may be insufficient, and air may mix with the oil flowing into a damping force generator, causing air biting. If air biting occurs, the desired damping force cannot be generated.

[0007] An object of one aspect of the present invention is to provide a hydraulic shock absorber that can stably generate a damping force. SOLUTION TO THE PROBLEM

[0008] To solve the above problems, a hydraulic shock absorber of one aspect of the present invention includes: a vehicle body-side pipe arranged on a vehicle body side; an axle-side pipe arranged on an axle side; a cylinder provided in the axle-side pipe and having at least one opening portion in an axle-side side wall surface; a reservoir defined on an outer side of the cylinder and containing oil; a rod provided in the vehicle body-side pipe; a piston provided on an axle side of the rod and sliding with respect to an inner peripheral surface of the cylinder; a damping force generating unit that generates a damping force by oil flow due to movement of the piston;and a movement preventing member disposed outside the cylinder and on a vehicle body side of the opening portion, which prevents the oil from moving from the axle side to the vehicle body side; ADVANTAGEOUS EFFECTS OF THE INVENTION

[0009] According to the aspect of the present invention, a damping force can be stably generated. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a configuration of a hydraulic shock absorber according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing a configuration of an axle-side end portion of the hydraulic shock absorber. Fig. 3 is a plan view of a movement preventing member when viewed from an axial direction. Fig. 4 is a cross-sectional view showing a configuration of an axle-side end portion of a hydraulic shock absorber according to another embodiment of the present invention. DESCRIPTION OF EMBODIMENTS [Embodiment 1]

[0010] An exemplary front fork leg as an embodiment of a hydraulic shock absorber of the present invention will be described below.

[0011] Fig. 1 is a cross-sectional view showing a configuration of a hydraulic shock absorber according to an embodiment of the present invention. A hydraulic shock absorber 1 is a device mounted in pairs on both the left and right sides of a wheel (not shown) in a ride-on vehicle, such as a two-wheeled vehicle or a three-wheeled vehicle, and functions as a suspension device for suspending the wheel.

[0012] According to the presentation in Fig. 1, the hydraulic shock absorber 1 is telescopic and includes a cylindrical tube 11 (vehicle body-side tube) connected to a vehicle body-side bracket (not shown), and a cylindrical tube 12 (axle-side tube) connected to an axle-side bracket 13. The tube 12 moves with respect to the tube 11 with a rod 16 as an axis and moves in and out of the tube 11. A coil spring 14 is arranged in the tube 12, urging the tube 11 and the tube 12 in a rebound direction. In the present embodiment, the hydraulic shock absorber 1 constitutes a pair of front fork legs in combination with another suspension device (not shown) having a coil spring 14 and no built-in damper.As a further embodiment, front fork legs equipped with suspension devices with built-in dampers on both the left and right sides may be provided.

[0013] In the hydraulic shock absorber 1, when the wheel (not shown) receives an impact due to the unevenness of a road surface, the tube 12 telescopically moves in and out of the tube 11. A process of compression of the hydraulic shock absorber 1 is called a compression stroke, and a process of rebound of the hydraulic shock absorber 1 is called a rebound stroke. In the present embodiment, the hydraulic shock absorber 1 is described as an upside-down type in which the tube 12 moves in and out of the tube 11, but the hydraulic shock absorber 1 may also be an upright type in which the tube 11 moves in and out of the tube 12.

[0014] The hydraulic shock absorber 1 includes a cylinder 15 mounted on an axle side of the tube 12 with a central axis C1 as its axis, and a rod 16 mounted on a vehicle body side of the tube 11 with the central axis C1 as its axis. A direction in which the central axis C1 extends is referred to as an axial direction.

[0015] A vehicle body side opening portion of the cylinder 15 is closed by a rod guide 17, and an axis side of the rod 16 penetrates the rod guide 17. The rod guide 17 slidably supports the rod 16, and a rebound stop spring 18 that generates a reaction force when the tube 11 and the tube 12 are fully extended is arranged on an axis side of the rod guide 17.

[0016] The interior of the cylinder 15 is filled with oil (hydraulic oil), and a piston 19 provided on the axis side of the rod 16 slides relative to an inner peripheral surface of the cylinder 15 as the tube 11 and the tube 12 extend and retract. The piston 19 divides the cylinder 15 into a lower chamber 20 and an upper chamber 21.

[0017] According to the presentation in Fig. 1, the rod 16 is a hollow shaft member with a flow path 22 through which oil flows. The rod 16 has an opening portion 23 providing an opening in an axle-side end portion thereof and an opening portion 24 providing an opening in a vehicle-body-side end portion thereof. The upper chamber 21 is a vehicle-body-side oil chamber within the oil chambers defined by the piston 19 sliding in the cylinder 15.

[0018] In the hydraulic shock absorber 1, during both the compression stroke and the rebound stroke, the oil flows from the upper chamber 21 into the flow path 22, flows through the inside of the flow path 22 from an axle side thereof to a vehicle body side thereof, and passes through a control unit 10 arranged on a vehicle body side of the rod 16.

[0019] A bottom valve 27 is disposed at an axle-side end portion of the cylinder 15, and the control unit 10 (damping force generating unit) is disposed on a cap member 25 disposed on the vehicle body side of the pipe 11. The control unit 10 is a damping force generator that generates a damping force by the flow of oil flowing out of the opening portion 24 of the rod 16 (i.e., the flow of oil generated by the movement of the piston 19) and electronically controls an opening area of ​​a variable throttle valve to control the magnitude of the damping force generated when the oil flows through the variable throttle valve.

[0020] The control unit 10 provided in the hydraulic shock absorber 1 does not need to be an electronically controlled damping force generator, and a damping force generator that manually adjusts the damping force may be provided in the hydraulic shock absorber 1. The damping force generator provided in the hydraulic shock absorber 1 does not need to be a device formed as a unit on the vehicle body side of the tube 11. The hydraulic shock absorber 1 may be provided with a known substitutable damping force generator.

[0021] A vehicle body-side opening of the tube 11 is closed by the cap member 25, and an axle-side opening of the tube 12 is closed by the axle-side bracket 13. To prevent the leakage of gas and oil trapped in the tube 11 and the tube 12, a tubular gap in an interference portion between the tube 11 and the tube 12 is sealed with an oil seal or the like.

[0022] In the hydraulic shock absorber 1, the oil is stored in a reservoir 26, which is a space on an outer side of the cylinder 15 surrounded by the tube 11 and the tube 12. That is, the reservoir 26 is an oil chamber that stores oil and is defined on an outer side of the cylinder 15 and an inner side of the tube 11 and the tube 12. Since the reservoir 26 is not completely filled with oil, an air chamber containing a gas such as air is formed from a liquid level (not shown) of the stored oil on the vehicle body side. The reservoir 26 compensates for a volume of oil entering the cylinder 15 when the rod 16 enters the cylinder 15 and a volume change of the oil caused by a temperature change.

[0023] Fig. 2 is a cross-sectional view showing a configuration of an axle-side end portion of the hydraulic shock absorber 1. As shown in Fig. 2, an opening portion 43 is formed in a side wall surface of the cylinder 15 on the axis side thereof. At least one opening portion 43 is formed, for example, four opening portions 43 are formed. The opening portion 43 is an opening portion for the oil stored in the reservoir 26 to flow into the interior of the cylinder 15. These opening portions 43 are formed closer to the axis side than a multi-layer valve 33 of the bottom valve 27. An opening center axis C2 of the opening portion 43 is orthogonal to the center axis C1.

[0024] Outside the cylinder 15 (i.e., inside the reservoir 26), a movement preventing member 41 is provided to prevent the oil from moving from the axle side to the vehicle body side in the reservoir 26. The movement preventing member 41 includes a spring receiving portion 41A (axle side surface) that receives one end of the coil spring 14, and a leg portion 41B that extends from the spring receiving portion 41A toward the axle side. The spring receiving portion 41A is positioned closer to the vehicle body side than the opening portions 43. It is sufficient that at least a part of the movement preventing member 41 is disposed on the vehicle body side of the opening portions 43.

[0025] An axle-side portion of the leg portion 41B abuts against a step portion 13A formed on an inner wall surface of the axle-side bracket 13, and an oil pan chamber 42 is defined by the movement preventing member 41, the inner wall surface of the axle-side bracket 13, and an outer wall surface of the cylinder 14.

[0026] Fig. 3 is a plan view of the movement preventing member 41 when viewed from the axial direction. In Fig. 3, elements other than the movement preventing element 41 and the cylinder 15 have been omitted. According to the illustration in Fig. 3, the spring receiving portion 41A has a substantially circular outer periphery, and the leg portion 41B is formed in a tubular shape along the outer periphery. An opening portion 41C for receiving the cylinder 15 is formed in the center of the spring receiving portion 41A. Since a diameter of the opening portion 41C is larger than an outer diameter of the cylinder 15, an annular gap 50 is formed between the opening portion 41C and the outer wall surface of the cylinder 15.

[0027] As indicated by a solid arrow in Fig. 2, the oil in the reservoir 26 normally moves from the vehicle body side to the axle side through the gap 50 and then flows into the interior of the cylinder 15 through the opening portions 43. Thus, it can be said that the movement preventing member 41 defines a gap 50 that allows the oil to flow from the vehicle body side to the axle side.

[0028] Since gas is present on the vehicle body side of the reservoir 26 as described above, when the hydraulic shock absorber 1 vibrates in the up-and-down direction, the oil in the reservoir 26 moves toward the vehicle body side, and there is no oil near the opening portions 43. When the hydraulic shock absorber 1 is rapidly rebounded in such a state, the oil supplied to the interior of the cylinder 15 is insufficient. As a result, air is mixed into the oil supplied to the control unit 10 through the flow path 22 of the rod 16, and a phenomenon called air intake occurs, in which the damping force is not generated. When air intake occurs, the ride quality and maneuverability of the vehicle deteriorate.

[0029] The movement preventing member 41 is provided to prevent such a phenomenon. That is, when the hydraulic shock absorber 1 vibrates in the up-and-down direction, the oil on the axle side of the reservoir 26 moves to the vehicle body side, as shown in Fig. 2 by a dashed arrow. In the movement preventing member 41, part of the oil flow is blocked by the spring receiving portion 41A, and the oil is retained in the oil pan chamber 42. This allows the oil to remain near the opening portions 43 and prevents interruption of the supply of oil to the interior of the cylinder 15. An axle side surface 41E of the spring receiving portion 41A corresponds to an axle side surface of the movement preventing member 41, which blocks movement of the oil to the vehicle body side.

[0030] In this way, in order to ensure that the oil, the movement of which is blocked by the spring receiving portion 41A, flows efficiently into the interior of the cylinder 15 from the opening portions 43, it is preferable that a portion of the opening 43 closest to the vehicle body side be in substantially the same position as the surface 41E of the spring receiving portion 41A. Fig. In the example shown in FIG. 2, the surface 41E of the spring receiving portion 41A is flat, and the surface 41E and the portion of the opening portion 43 closest to the vehicle body side are adjacent to each other in the axial direction of the hydraulic shock absorber 1. For example, a position of the surface 41E in the axial direction and a position of the portion of the opening portion 43 closest to the vehicle body side in the axial direction are substantially the same within a range of design error.

[0031] However, the position of the movement preventing member 41, in particular the position of the surface 41E, is not limited to that shown in Fig. 2, and the position of the surface 41E in the axial direction may overlap that of the opening portion 43, or the surface 41E may be positioned closer to the vehicle body side than the opening portion 43. Furthermore, the surface 41E does not need to be flat, as shown in an example in Embodiment 2.

[0032] It is preferable that an opening area of ​​the gap 50 be greater than or equal to a sum of opening areas of the plurality of opening portions 43. This is because if the opening area of ​​the gap 50 is smaller than the sum of the opening areas of the plurality of opening portions 43, a flow path resistance of the oil flowing through the gap 50 increases, and the inflow of the oil into the interior of the cylinder 15 is blocked.

[0033] Furthermore, according to the presentation in Fig. 2 and Fig. 3, the movement preventing member 41 has an inclined surface 41D between the vehicle body side surface of the spring receiving portion 41A and the opening portion 41C. When the inclined surface 41D is considered as part of the opening portion 41C, a diameter of the opening portion 41C formed in the movement preventing member 41 is larger on the vehicle body side than on the axle side.

[0034] Thus, the oil flowing from the vehicle body side to the axle side flows efficiently through the opening portion 41C, but the flow of the oil from the axle side to the vehicle body side tends to be blocked. (Oil flow in the hydraulic shock absorber 1)

[0035] At the compression stroke, when a volume of the upper chamber 21 (with respect to Fig. 1) increases, the oil flows from the lower chamber 20 to the upper chamber 21. Then, an amount of oil in the lower chamber 20 corresponding to a penetration volume of the rod 16 is excess, so that the excess oil flows through the opening portions 43 and flows out of the container 26.

[0036] On the other hand, during the rebound stroke, when a volume of the lower chamber 20 increases, the oil in the reservoir 26 flows through the opening portions 43 and flows into the cylinder 15. (Overview)

[0037] As described above, the hydraulic shock absorber 1 includes: the tube 11 on the vehicle body side; the tube 12 on the axle side; the cylinder 15 provided in the tube 11 and having at least one opening portion 43 in the axle-side side wall surface; the reservoir 26 defined on an outer side of the cylinder 15 and containing oil; the rod 16 provided on the tube 11; the piston 19 provided on the axle side of the rod 16 and sliding with respect to the inner peripheral surface of the cylinder 15; the control unit 10 that generates a damping force by oil flow due to the movement of the piston 19; and the movement preventing member 41 that is arranged outside the cylinder 15 and on the vehicle body side of the opening portion 43 and that blocks movement of the oil from the axle side to the vehicle body side.

[0038] According to the configuration, even if the vehicle to which the hydraulic shock absorber 1 is mounted vibrates in the up and down direction, the oil remains near the opening portion 43 because the movement preventing member 41 blocks the upward movement of the oil in the reservoir 26.

[0039] Thus, even if the hydraulic shock absorber 1 is rapidly rebounded, since the oil is supplied to the inside of the cylinder 15, air is not mixed into the oil flowing into the control unit 10 and thus the damping force can be stably generated.

[0040] The axle-side surface 41E of the movement-preventing member 41 and the portion of the opening portion 43 closest to the vehicle body side are adjacent to each other in the axial direction of the hydraulic shock absorber 1. Thus, the oil, whose movement is blocked by the surface 41E of the movement-preventing member 41, can efficiently flow into the opening portion 43.

[0041] The movement preventing member 41 defines a gap 50, which allows the flow of oil from the vehicle body side to the axle side, between the movement preventing member 41 and the side wall surface of the cylinder 15. The oil in the reservoir 26 moves from the vehicle body side to the axle side through the gap 50. By placing the gap between the movement preventing member 41 and the side wall surface of the cylinder 15 as a flow path of the oil, the flow path can be formed more easily than in a case where the flow path is formed in another portion of the movement preventing member 41.

[0042] Furthermore, by forming the gap 50 along at least a part of a periphery of the side wall surface of the cylinder 15, the oil in the reservoir 26 can move from the vehicle body side to the axle side.

[0043] Furthermore, the opening area of ​​the gap 50 is greater than or equal to a sum of the opening areas of the at least one opening section 43. With the configuration, the flow path resistance of the oil flowing through the gap 50 is reduced and a blockage of the supply of the oil into the interior of the cylinder 15 can be prevented.

[0044] The coil spring 14 is provided in the container 26, and the movement preventing member 41 includes the spring receiving portion 41A that receives the coil spring 14 and the leg portion 41B that extends from the spring receiving portion 41A toward the axle side. With this configuration, the movement preventing member 41 can also function as a spring receiving portion that receives the coil spring 14 in the container 26. [Embodiment 2]

[0045] Another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the above embodiment will be denoted by the same reference numerals, and their description will be omitted.

[0046] Fig. 4 is a cross-sectional view showing a configuration of an axle-side end portion of a hydraulic shock absorber 1A according to the present embodiment. As shown in Fig.4, similar to the movement preventing member 41, a movement preventing member 51 provided in the hydraulic shock absorber 1A includes a spring receiving portion 51A, a leg portion 51B, an opening portion 51C, and an inclined surface 51D. The movement preventing member 51 differs from the movement preventing member 41 in that the movement preventing member 51 has a recessed portion 51E recessed toward the vehicle body side on an axle side surface of the spring receiving portion 51A. Thus, a portion of the recessed portion 51E closest to the vehicle body side (the bottom of the recessed portion) is positioned closer to the vehicle body side than a portion of the opening portion 43 closest to the vehicle body side.

[0047] An axle side surface of a portion constituting the opening portion 51C is substantially the same in position as a portion of the opening portion 43 closest to the vehicle body side. This point is the same as the movement preventing member 41 of Embodiment 1. [Embodiment 3]

[0048] Another embodiment of the present invention will be described below. The movement preventing member 51 can also be applied to a modification of the present embodiment.

[0049] The gap 50 formed by the movement preventing member 41 does not necessarily have to be formed over the entire periphery of the side wall surface of the cylinder 15 and may be formed along at least a part of the side wall surface.

[0050] The spring receiving portion for receiving the coil spring 14 may be provided separately from the movement preventing member 41, and the movement preventing member 41 without the leg portion 41B may be arranged on the vehicle body side of the opening portion 43.

[0051] The spring receiving portion 41A may have an opening portion as an alternative to the gap 50, which allows the flow of oil from the vehicle body side to the axle side, at a position away from the side wall surface of the cylinder 15. Furthermore, the opening portion may have a structure or shape that allows the flow of oil from the vehicle body side to the axle side and blocks the flow of oil from the axle side to the vehicle body side.

[0052] For example, an opening portion may be formed in the spring receiving portion 41A, and a check valve that allows the flow of oil from the vehicle body side to the axle side and restricts the flow of oil from the axle side to the vehicle body side may be provided in the opening portion.

[0053] The present invention is not limited to the embodiments described above, various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in the various embodiments are also included in the technical scope of the present invention. LIST OF REFERENCE SYMBOLS 1 hydraulic shock absorber 10 Control unit (damping force generation unit) 11 Pipe (vehicle body side pipe) 12 Pipe (axle-side pipe) 14 coil spring 15 cylinders 16 bars 19 pistons 26 containers 43 Opening section 41 Movement prevention link 41A Spring receiving section 41B Thigh section 41D inclined surface 41E area 50 gap 51 Movement prevention link 51E Deepening section

Claims

[1] Hydraulic shock absorber (1) comprising: a vehicle body side pipe (11) arranged on a vehicle body side; an axle-side tube (12) arranged on one axle side; a cylinder (15) provided in the axle-side tube (12) and having at least one opening portion (43) in an axle-side side wall surface; a container (26) defined on an outer side of the cylinder (15) and containing oil; a rod (16) provided in the vehicle body side tube (11); a piston (19) provided on an axis side of the rod (16) and sliding with respect to an inner peripheral surface of the cylinder (15); a damping force generating unit (10) which generates a damping force by oil flow due to a movement of the piston (19); and a movement preventing member (51) arranged outside the cylinder (15) and on a vehicle body side of the opening portion (43) and preventing the oil from moving from the axle side to the vehicle body side, wherein a recessed portion (51E) recessed toward the vehicle body side is formed on an axle side surface of the movement preventing member (51) that blocks movement of the oil. [2] Hydraulic shock absorber (1) comprising: a vehicle body side pipe (11) arranged on a vehicle body side; an axle-side tube (12) arranged on one axle side; a cylinder (15) provided in the axle-side tube (12) and having at least one opening portion (43) in an axle-side side wall surface; a container (26) defined on an outer side of the cylinder (15) and containing oil; a rod (16) provided in the vehicle body side tube (12); a piston (19) provided on an axis side of the rod (16) and sliding with respect to an inner peripheral surface of the cylinder (15); a damping force generating unit (10) which generates a damping force by oil flow due to a movement of the piston (19); and a movement preventing member (41) arranged outside the cylinder (15) and on a vehicle body side of the opening portion (43) and preventing the oil from moving from the axle side to the vehicle body side, wherein the movement preventing member (41) defines a gap (50) allowing oil to flow from the vehicle body side to the axle side between the movement preventing member (41) and the side wall surface of the cylinder (15). [3] Hydraulic shock absorber (1) according to claim 2, wherein the gap (50) is formed along at least a part of a periphery of the side wall surface of the cylinder (15). [4] Hydraulic shock absorber (1) according to claim 2 or 3, wherein an opening area of ​​the gap (50) is greater than or equal to a sum of the opening areas of the at least one opening section (43). [5] Hydraulic shock absorber (1) comprising: a vehicle body side pipe (11) arranged on a vehicle body side; an axle-side tube (12) arranged on one axle side; a cylinder (15) provided in the axle-side tube (12) and having at least one opening portion (43) in an axle-side side wall surface; a container (26) defined on an outer side of the cylinder (15) and containing oil; a rod (16) provided in the vehicle body side tube (11); a piston (19) provided on an axis side of the rod (16) and sliding with respect to an inner peripheral surface of the cylinder (15); a damping force generating unit (10) which generates a damping force by oil flow due to a movement of the piston (19); and a movement preventing member (41) arranged outside the cylinder (15) and on a vehicle body side of the opening portion (43) and preventing the oil from moving from the axle side to the vehicle body side, wherein a spring (14) is provided in the container (26), and the movement preventing member (41) comprises a spring receiving portion (41A) receiving the spring (14) and a leg portion (41B) extending from the spring receiving portion (41A) toward the axle side. [6] The hydraulic shock absorber (1) according to any one of claims 2-5, wherein an axis side surface (41E) of the movement preventing member (41, 51) that prevents movement of the oil and a portion of the at least one opening portion (43) closest to the vehicle body side are adjacent to each other in an axial direction of the hydraulic shock absorber (1).

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