JP2008002590A - Stably fixing structure of aligning member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure simply concentricity in an inner cylinder arranged in a center of an axel of an outer cylinder in a multiple-cylinder type hydraulic shock absorber. <P>SOLUTION: There is provided a multiple-cylinder type hydraulic shock absorber including the inner cylinder 2 arranged concentrically to the center of the axel of the outer cylinder 1. In a stably fixing structure of an aligning member including an aligning member 10 whose upper end lateral side 10a is coupled integrally to a lower end of the inner cylinder 2 while being supported on a bottom member 3 which closes a lower end of the outer cylinder 1, the aligning member 10 includes a lower end lateral side 10b which is cylindrically formed and whose lower end is consecutive to the upper end lateral side 10a to be allowed to be seated on an inner bottom surface 3a of a bottom member 3. The bottom member 3 is formed in a protruding manner toward an inside of the inner cylinder 2 to be located adjacently to an inside of the lower end lateral side 10b in the aligning member 10 and includes, in the inner bottom surface 3a, a protrusion 3b whose outer circumference is opposed to an inner circumference of the lower end lateral side 10b in the aligning member 10. Then, an outer circumferential position of the protrusion 3b is parallel to a circular line concentric to the aligning member 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing structure for an alignment member, and more particularly, to a multi-cylinder hydraulic shock absorber having an inner cylinder concentrically with an axial center portion of an outer cylinder, and carried by a bottom member that closes the lower end of the outer cylinder. However, the present invention relates to an improvement in the fixing structure of the alignment member in which the upper end side portion is integrally connected to the lower end of the inner cylinder.

  In a multi-cylinder type hydraulic shock absorber having an inner cylinder concentrically with the axial center portion of the outer cylinder, the upper end side portion is integrally formed with the lower end of the inner cylinder while being supported by a bottom member that closes the lower end of the outer cylinder. There have been various proposals for fixing structures of the alignment members to be connected. Among them, for example, the proposal disclosed in Patent Document 1 can be listed.

  In other words, this patent document 1 proposes that the inner cylinder, which is a cylinder body that is disposed in the shaft core portion of the outer cylinder and forms a double cylinder type hydraulic shock absorber together with the outer cylinder, is concentric with the outer cylinder. The inner cylinder aligning structure is arranged, and the base valve portion is involved in the realization of the inner cylinder aligning structure.

  In many cases, the base valve portion is a double cylinder type hydraulic shock absorber, and the upper end side portion of the valve seat member forming the base valve portion is in parallel with the pressure side damping valve and the pressure side damping valve. While having a pressure side check valve, the lower end of the inner cylinder is integrally connected by press fitting.

  And in this base valve part, the lower end side part in the valve seat member continuing to the above-mentioned upper end side part is made into the leg part formed in the shape of a cylinder, and the lower end of this leg part serves as the lower end of the outer cylinder. It is assumed that it is seated in a surface contact state on the inner bottom surface of the bottom member to be closed.

  At this time, in the double cylinder type hydraulic shock absorber, a space between the inner cylinder and the outer cylinder is a reservoir chamber, and the reservoir chamber is a communication hole for opening the leg portion of the valve seat member, The pressure side damping valve and the pressure side check valve provided on the valve seat member communicate with the oil chamber in the inner cylinder.

  Further, in this double cylinder type hydraulic shock absorber, a piston body is slidably accommodated in the inner cylinder, and this piston body defines an upper oil chamber and a lower oil chamber in the inner cylinder. In addition, the upper oil chamber and the lower oil chamber can be communicated with each other through an extension side damping valve that constitutes a damping portion in the piston body and an extension side check valve that is in parallel with the extension side damping valve.

  By the way, regarding the base valve portion, as disclosed in Patent Document 1 described above, according to the proposals so far, the valve seat member constituting the base valve portion has an outer diameter substantially the same as the outer diameter of the inner cylinder. It has a leg portion that is a lower end side portion formed in a cylindrical shape, and the lower end of the leg portion is placed in surface contact with an inclined surface that forms the inner bottom surface of the bottom member.

  On the other hand, in the proposal newly disclosed in Patent Document 1, the center rod that penetrates the shaft core portion of the valve seat member, not the valve seat member, and fixes the pressure side damping valve and the pressure side check valve to the valve seat member. It is assumed that the lower end interferes with the central portion of the inner bottom surface formed in a bowl shape of the bottom member.

  That is, as an example, the center rod is formed so that the lower end thread portion is longer than allowing the nut to screw the pressure side damping valve and the pressure side check valve to the valve seat member under a predetermined cracking pressure. The lower end of the lower end thread portion interferes with the central portion of the inner bottom surface formed in a substantially bowl shape of the bottom member.

  Therefore, when the base valve portion is carried on the inner bottom surface of the bottom member, the valve seat member is in surface contact with the bottom member in the previous proposals. In other words, the sheet member comes into point contact with the bottom member.

  As a result, when assembling the hydraulic shock absorber, the base valve portion is fixed to the bottom member, and when the base valve portion is brought into point contact with the bottom member, compared to when the base valve portion is in surface contact with the bottom member. It can be said that the fixing operation of the base valve portion can be facilitated, and the alignment operation of the cylinder body with respect to the outer cylinder can be facilitated.

And among the proposals newly disclosed in Patent Document 1, there is a proposal that both the lower end of the center rod and the inner bottom surface of the bottom member are linked by a concavo-convex structure. Even if an external force that cannot be predicted in the radial direction is applied to the outer cylinder during transportation or handling of the hydraulic shock absorber after commercialization, the fixing position with respect to the bottom member of the base valve portion does not go wrong. Thus, the eccentricity of the inner cylinder corresponding to the bottom member is not expressed, and therefore, there is no fear that the piston body accommodated in the inner cylinder will come into contact with the inner cylinder when sliding in the inner cylinder.
Japanese Unexamined Patent Publication No. 2003-166777 (Claims Claims 1, Paragraphs 0004, 0011 to 0015, FIGS. 1 to 5 in the specification)

  However, in the proposal disclosed in the above-described Patent Document 1, it can be said that there is no problem in preventing the eccentricity of the inner cylinder with respect to the outer cylinder in the double cylinder type hydraulic shock absorber. It may be pointed out that there is a risk that the attenuation characteristic will not be expressed as set.

  That is, in order to ensure concentricity of the inner cylinder with respect to the outer cylinder by the proposal newly disclosed in Patent Document 1 described above, the center rod is possible rather than interfering with the bottom member under a small stress. It is preferable to interfere with the bottom member under as much stress as possible.

  However, since the center rod in the base valve portion essentially fixes the compression side damping valve and the compression side check valve to the valve seat member in cooperation with the nut, the lower end of the center rod interferes with the inner bottom surface of the bottom member. Then, even if the center rod appropriately manages the stress that the center rod has with respect to the compression side damping valve in the base valve portion before the interference, that is, before being carried on the bottom member, this will be changed later. .

  When the stress of the center rod is changed, the stress required for fixing to the valve seat member is changed from the viewpoint of the compression side damping valve and the compression side check valve. There is a risk that it will be difficult to express the damping characteristics of the valve as set.

  Also, as long as the center rod is required to interfere with the bottom member when fixing the base valve portion, particularly set the stress to fix the compression side damping valve to the valve seat member with the center rod. It can be said that it is difficult to keep it on the street.

  The present invention was devised in view of the above circumstances, and the object of the present invention is basically a double cylinder type hydraulic shock absorber, which is disposed in the shaft core portion of the outer cylinder. The concentricity in the inner cylinder can be easily ensured, and more specifically, when the alignment member that realizes the concentricity of the inner cylinder is the valve seat member in the base valve portion, The damping characteristic of the base valve portion can be maintained as set, and as a result, an alignment member that is optimal for expecting improved versatility in a double cylinder type hydraulic shock absorber having an inner cylinder and an outer cylinder. It is to provide a fixing structure.

  In order to achieve the above-described object, the configuration of the fixing structure of the alignment member according to the present invention is basically applied to a multi-cylinder hydraulic shock absorber having an inner cylinder concentrically with the shaft core portion of the outer cylinder. In the fixing structure of the alignment member, the alignment member having an alignment member whose upper end side is integrally connected to the lower end of the inner cylinder while being supported by the bottom member closing the lower end of the outer cylinder. The bottom end of the alignment member has a bottom end portion formed in a cylindrical shape that is continuous with the top end side portion and seats the bottom end on the inner bottom surface of the bottom member, and the bottom member protrudes from the inner bottom surface toward the inside of the inner cylinder. It has a protrusion that makes the outer periphery face the inner periphery of the lower end side portion of the alignment member while being present inside the side portion, and the outer peripheral position of this protrusion is along a circular line that is concentric with the alignment member. .

  Therefore, in the present invention, when assembling a multi-cylinder type hydraulic shock absorber having an inner cylinder concentrically with the axial core part of the outer cylinder, the lower end of the lower end side part formed in a cylindrical shape in the alignment member When the base member is seated on the inner bottom surface of the bottom member, the protrusion that is present on the inner side of the lower end side portion, that is, the protrusion that is formed to protrude toward the inner side of the inner cylinder on the inner bottom surface of the bottom member, Since it is made to oppose the inner periphery of a lower end side part, first, the outer periphery of this protrusion is opposed to the inner periphery of the lower end side part of the alignment member without a gap, that is, set to contact. In such a case, the alignment member cannot move in the radial direction of the bottom member with respect to the bottom member, and therefore, the inner cylinder that connects the upper end side portion of the alignment member integrally with the lower end is concentric with the outer cylinder. Sex is guaranteed.

  And when the above-mentioned protrusion is set to face the inner periphery of the lower end side portion of the alignment member with a gap, the inner periphery of the lower end side portion of the alignment member is set to contact the outer periphery of the protrusion Compared to the case of the above, when the lower end of the lower end side portion of the alignment member is seated on the inner bottom surface of the bottom member, the lower end of the lower end side portion of the alignment member may cause a problem such as getting on the upper end of the protrusion. Thus, it is possible to realize the alignment work that allows the lower end of the alignment member to become familiar with the inner bottom surface of the bottom member while preventing the so-called assembling phenomenon from occurring.

  In the following, the present invention will be described based on the illustrated embodiment. In the illustrated embodiment, the fixing structure of the alignment member according to the present invention is provided on the shaft core portion of the outer cylinder 1 as shown in FIG. It is assumed that it is embodied in a double cylinder type hydraulic shock absorber having an inner cylinder 2 on the same core.

  That is, the fixing structure of the alignment member according to the present invention is a double cylinder type hydraulic shock absorber having an outer cylinder 1 and an inner cylinder 2, and the inner cylinder 2 disposed on the shaft core portion of the outer cylinder 1 is an outer cylinder. It is intended to embody being arranged concentrically with respect to the cylinder 1, and basically it is required to have an alignment member 10.

  Then, if the concentric arrangement of the inner cylinder 2 with respect to the outer cylinder 1 is embodied, it can be said that the alignment member 10 may be formed in a configuration that cannot perform other functions.

  However, this type of multi-cylinder type hydraulic shock absorber has a damping part inside in many cases, and it is assumed that the damping part is set so as to perform a predetermined damping action during expansion / contraction operation. Is normal.

  Therefore, in the following description of the present invention, it is assumed that the alignment member 10 is a valve seat member that forms a base valve portion that is disposed so as to close the lower end of the inner cylinder 2 that is a cylinder body.

  Incidentally, a piston body (not shown) is slidably accommodated in the inner cylinder 2, and an upper oil chamber (not shown) and a lower oil chamber R are defined in the inner cylinder 2 by this piston body. The upper oil chamber and the lower oil chamber R are formed, and an extension side damping valve (not shown) constituting a damping part disposed in the piston body, and an extension side check valve (see FIG. (Not shown) can communicate with each other.

  A space between the inner cylinder 2 and the outer cylinder 1 serves as a reservoir chamber R1, and the reservoir chamber R1 is a pressure-side damping valve 11 and a pressure-side check valve 12 that constitute a damping portion disposed in the base valve portion. It is supposed that it communicates with the lower oil chamber R in the inner cylinder 1 via.

  By the way, the alignment member 10 is configured such that the upper end side portion 10a defines the inside of the inner cylinder 2 and the outside of the inner cylinder 2 while being supported on the bottom member 3 that closes the lower end of the outer cylinder 1 under a liquid-tight structure by welding or the like. In the drawing, the alignment member 10 is fitted to the lower end of the inner cylinder 2. Thus, neither the axial direction of the inner cylinder 2 nor the radial direction of the inner cylinder 2 is shifted so-called, and it is said that the state is integrally connected to the lower end of the inner cylinder 2.

  And this alignment member 10 makes the lower end side part 10b continuous with the upper end side part 10a into the leg part formed in the cylinder shape, and makes the lower end of this leg part seat on the inner bottom face 3a of the bottom member 3 It is supposed that it is carried by the bottom member 3.

  At this time, the leg portion which is the lower end side portion 10b of the alignment member 10 is formed with a communication hole 10c which allows communication between the inner side and the outer side, and the defining portion which is the upper end side portion 10a. Is provided with an inner peripheral side port 10d and an outer peripheral side port 10e that allow communication between the inside of the inner cylinder 2 and the outside of the inner cylinder 2.

  Then, the downstream end of the outer peripheral side port 10e is opened, the pressure side check valve 12 is seated on the end face facing the inner cylinder 2, and the downstream end of the inner peripheral side port 10d is opened to face the outer side of the inner cylinder 2. The compression side damping valve 11 is seated on the end surface.

  In addition, a center rod 13 that passes through the shaft core portions of the compression side check valve 12 and the pressure side damping valve 11 passes through the shaft core portion of the defining portion which is the upper end side portion 10a, and the lower end screw portion 13a. The compression side check valve 12 and the compression side damping valve 11 are seated on the respective valve seat surfaces by screwing the nuts 14 into the valve.

  Incidentally, the lower end thread portion 13a in the center rod 13 is in the present invention, and the lower end is not allowed to interfere with the inner bottom surface 3a of the bottom member 3, but as described above, the lower end of the center rod 13 is the bottom When the interference with the inner bottom surface 3a of the member 3, the stress that the center rod 13 has on the compression side damping valve 11 in the base valve portion before being supported by the bottom member 3, that is, the cracking pressure in the compression side damping valve 11 is appropriate. This is to avoid changing this after a while.

  In order to prevent the lower end of the center rod 13 in the base valve portion from interfering with the inner bottom surface 3a of the bottom member, it is only necessary to form the base valve portion as before. Therefore, in the present invention, the base valve portion is modified. Will not be requested.

  On the other hand, in the present invention, the bottom member 3 has a protrusion 3b formed on the inner bottom surface 3a so as to protrude toward the inner side of the inner cylinder 2, and the protrusion 3b is formed by the alignment member 10. The outer circumference contacts the inner circumference of the lower end side portion 10b of the alignment member 10 so as to be along a circular line that is concentric with the inner circumference of the alignment member 10 while being located inside the lower end side portion 10b of the alignment member 10. (See FIG. 1).

  As shown in FIG. 2, the protrusion 3b has an intermittent portion 3c and is formed in an annular shape as shown in FIG. 2, and the protrusion 3b does not have the intermittent portion 3c. Compared to the case where it is formed in an annular shape, it is said that a smooth flow without obstruction of the hydraulic oil can be expected. However, this is not necessary from the original viewpoint of preventing misalignment of the alignment member 10 with respect to the bottom member 3. Of course, the protrusion 3b may be formed in an annular shape.

  Therefore, as described above, in the alignment member 10 that integrally connects the inner cylinder 2 to the upper end in a state in which the lower end of the lower end side portion 10b is seated on the inner bottom surface 3a of the bottom member 3, the bottom member 3 Since the protrusion 3b formed on the inner bottom surface 3a of the inner surface of the lower end side portion 10b is brought into contact with the inner periphery of the lower end side portion 10b, the alignment member 10 is The bottom member 3 integrally connected to the outer cylinder 1 cannot be displaced, and therefore the concentricity of the inner cylinder 2 with respect to the outer cylinder 1 is permanently guaranteed.

  In addition, when assembling a double cylinder type hydraulic shock absorber having the inner cylinder 2 concentrically with the shaft core portion of the outer cylinder 1, the inner cylinder 2 inserted into the outer cylinder 1 is attached to the outer cylinder 1. It becomes easy to position on the same core, and when assembling this type of multi-cylinder type hydraulic shock absorber, compared to the previous assembly work that was supposed to be assembled without having the protrusion 3b on the bottom member 3, It can be said that concentric work for ensuring concentricity is facilitated.

  FIG. 3 shows a bottom portion of a multi-cylinder hydraulic shock absorber having a bottom member 3 according to another embodiment. The bottom member 3 according to this embodiment is made of a press-formed product.

  The projecting portion 3b formed on the inner bottom surface 3a of the bottom member 3 is formed in a plateau shape that is circular in plan view, instead of being formed in an annular shape as shown in FIG. However, even in the case of this embodiment, the outer periphery of the protrusion 3b is positioned so as to be along a circular line that is concentric with the alignment member 10.

  Incidentally, even in the bottom member 3 according to this embodiment, the lower end of the outer cylinder 1 is connected so as to be closed in a liquid-tight state by welding or the like, and the center rod 13 constituting the base valve portion is formed in the protrusion 3b. It is considered that the lower end of the can not interfere.

  Therefore, in the case of this embodiment, the flow of the hydraulic oil from above the protrusion 3b, that is, the flow of the hydraulic oil through the compression side damping valve 11 in the base valve portion is inclined by the protrusion 3b. Therefore, it can smoothly flow into the open communication hole 10c to the lower end side portion of the alignment member 10 along the outer peripheral side.

  In the case of this embodiment, it will be advantageous in that the component weight can be reduced and the component cost can be reduced as compared with the case where the bottom member 3 is made of a cast product.

  FIG. 4 shows another embodiment of the protrusion 3 b formed on the inner bottom surface 3 a of the bottom member 3. In this embodiment, the protrusion 3 b extends from the center of the inner bottom surface 3 a of the bottom member 3. It is assumed to be composed of a plurality of ribs extending in the radial direction.

  And the outer peripheral side end of the rib is along a circular line that is concentric with the alignment member 10, that is, along the inner peripheral line of the lower end side portion 10b indicated by a virtual line in FIG. As a result, it is a matter of course that contact is made with the inner periphery of the lower end side portion 10b, but the aspect of the central portion on the opposite side of the outer peripheral side end is shown in FIG. As shown by a solid line diagram, it may be formed in a mode having a central part, or as shown by a broken line diagram, it may be formed in a separation mode having no central part.

  In addition, regarding the number of ribs of the protrusion 3b, that is, the number of ribs, the communication holes 10c opened in the lower end side portion 10b of the aligning member 10 are often provided at six equally spaced locations. In view of being provided, if a number that does not aim all at the communication hole 10c is selected, the number may be five, but in view of troubles in manufacturing a mold for forming the bottom member 3 and the like. As shown in the figure, it is most preferable that the number is four.

  Incidentally, even in this embodiment, it goes without saying that the lower end of the center rod 13 constituting the base valve portion does not interfere with the protruding portion 3b formed of the rib formed on the inner bottom surface 3a of the bottom member 3, In the case of the rib having the separation mode having no portion, it is advantageous in that the chance of interference with the protrusion 3b at the lower end is reduced.

  FIG. 5 shows another embodiment of the present invention. In this embodiment, the outer periphery of the protrusion 3b is opposed to the inner periphery of the lower end side portion 10b of the alignment member 10 with a gap. Yes.

  By the way, even in this embodiment, the configuration other than the protrusion 3b is the same as that of each of the embodiments described above. The description is omitted.

  Further, even in the protrusion 3b according to this embodiment, basically, the outer periphery is along a circular line that is concentric with the alignment member 10, that is, in the drawing, the lower end of the alignment member 10 The inner periphery of the side portion 10b is set so as to be opposed to each other with an annular gap.

  And even if it exists in the protrusion 3b by this embodiment, although it will be formed cyclically | annularly, instead of this, as shown in above-mentioned FIG. 2, it has the intermittent part 3c and is formed cyclically | annularly. Of course it will be very good.

  Under the above premise, in each of the above-described embodiments, the outer periphery of the protrusion 3b faces the inner periphery of the lower end side portion 10b of the alignment member 10 without a gap, that is, contacts. It is supposed to become.

  As a result, in each of the above-described embodiments, when the lower end of the lower end side portion 10b of the alignment member 10 is seated on the inner bottom surface 3a of the bottom member 3, the lower end of the lower end side portion 10b of the alignment member 10 is the protrusion 3b. There is a possibility of inconvenience of inconvenience such as getting on the top of the top.

  On the other hand, in this embodiment, when the lower end of the lower end side portion 10b of the alignment member 10 is seated on the inner bottom surface 3a of the bottom member 3, the lower end of the lower end side portion 10b of the alignment member 10 is the protrusion 3b. Invitation to the upper end can be avoided, and as a result, the lower end of the alignment member 10 can be adjusted to the inner bottom surface 3a of the bottom member 3 while preventing the occurrence of a so-called “combination failure” phenomenon. Core work becomes feasible.

  As described above, according to the present invention, when assembling a double cylinder type hydraulic shock absorber having the inner cylinder 2 concentrically with the shaft core portion of the outer cylinder 1, the protrusion 3 b is formed on the bottom member 3. Compared to the previous assembly work that was supposed to be assembled without having it, it becomes much easier to position the inner cylinder 2 inserted into the outer cylinder 1 concentrically with respect to the outer cylinder 1. However, the eccentricity of the cylinder body that is the inner cylinder 2 with respect to the outer cylinder 1 is not expressed, and therefore the cylinder body is slidable in the inner cylinder 2 when the piston body in the housing slides in the inner cylinder 2. No fear of hitting the body.

  In addition, according to the present invention, basically, modification of the bottom member 3 is required, but modification of the base valve part is not required, and therefore, the base valve part having a large number of parts is not required. In view of the fact that the intended purpose can be achieved without requiring modification, it can be said that the present invention is a very significant invention.

It is a longitudinal cross-sectional view which shows the bottom part of the double cylinder type hydraulic shock absorber which actualized the fixing structure of the alignment member by one Embodiment of this invention. It is a top view of the bottom member in the hydraulic shock absorber of FIG. It is a figure which shows the fixing structure of the alignment member by other Embodiment of this invention similarly to FIG. It is a figure which shows the bottom member by which the projection part by other embodiment was formed in the inner bottom face similarly to FIG. FIG. 5 is a view showing a fixing structure of an alignment member according to still another embodiment of the present invention, similar to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 Bottom member 3a Inner bottom face 3b Protrusion part 10 Alignment member 10a Upper end side part 10b Lower end side part 10c Communication hole 10d Inner peripheral side port 10e Outer peripheral side port 11 Pressure side damping valve
12 Pressure side check valve 13 Center rod 13a Lower end thread 14 Nut

Claims (6)

In a multi-cylinder type hydraulic shock absorber having an inner cylinder concentrically with the axial center portion of the outer cylinder, the upper end side portion is integrally formed with the lower end of the inner cylinder while being supported by a bottom member that closes the lower end of the outer cylinder. In the fixing structure of the alignment member having the alignment member to be connected, the alignment member has a lower end side portion formed in a cylindrical shape with the lower end seated on the inner bottom surface of the bottom member while continuing to the upper end side portion. The bottom member has a protrusion on the inner bottom surface that protrudes toward the inside of the inner cylinder and faces the inner periphery of the lower end side portion of the alignment member while facing the inner side of the lower end side portion of the alignment member. And a fixing member fixing structure characterized in that an outer peripheral position of the protrusion is along a circular line concentric with the aligning member. The fixing member fixing structure according to claim 1, wherein an outer periphery of the protrusion is in contact with an inner periphery of a lower end side portion of the alignment member or has a gap. The fixing structure of the alignment member according to claim 1, wherein the bottom member is a press-formed product. 2. The fixing structure for an alignment member according to claim 1, wherein the protrusion is formed in an annular shape or an intermittent annular shape. The fixing structure for the alignment member according to claim 1, wherein the protrusion includes a plurality of ribs extending in a radial direction from a central portion on an inner bottom surface of the bottom member. The alignment member is a valve seat member in a base valve portion disposed so as to close the lower end of the inner cylinder from the outside of the inner cylinder, and the lower end of the lower end side portion of the valve seat member is seated on the inner bottom surface of the bottom member. In addition, the upper end side portion continuing to the lower end side portion is defined as a defining portion that enables the inner cylinder and the inner cylinder to be defined, and this defining portion allows communication between the inner cylinder and the inner cylinder. Has an inner peripheral port and an outer peripheral port, opens the downstream end of the outer peripheral port, seats the compression side check valve on the end face facing the inner cylinder, and opens the downstream end of the inner peripheral port The pressure side damping valve is seated on the end surface facing the outside of the inner cylinder, and the lower end side portion has a communication hole that allows communication between the inner side and the outer side of the lower end side portion. And the center that penetrates the shaft core of the compression side damping valve The pressure side check valve and the pressure side damping valve are respectively fixed by screwing the nut onto the lower end thread portion of the lid so that the lower end of the lower end thread portion of the center rod does not interfere with the inner bottom surface of the bottom member. 2. A fixing structure of the alignment member according to 1.

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