Damper

Abstract

To provide a damper capable of reliably retaining the connected state of a plurality of divided bodies constituting a cap.SOLUTION: A damper comprising: a cylinder 21; a piston rod 22 provided in the cylinder 21, with a part extending out from the cylinder 21; and a cap 13 provided at an end of the cylinder 21, through which the piston rod 22 is inserted, where the cap 13 is formed from a plurality of divided bodies 51 comprising a divided cylindrical portion 55 disposed on a radially outer side of the cylinder 21 and a divided bottom portion 56 disposed at an axial end of the cylinder 21, the plurality of divided bodies 51 being shaped to fit with each other, and the divided bottom portion 56 comprising a first movement restricting section 64, 67 configured to restrict relative radial movement of the plurality of divided bodies 51 in a state where the plurality of divided bodies 51 are fitted together.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shock absorber. [Background technology]

[0002] In some shock absorbers, the side of the cylinder from which the rod protrudes is covered with a cap (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-070923 Summary of the Invention [Problem to be solved by the invention]

[0004] In a shock absorber, when the cap is formed by connecting a plurality of divided bodies, it is desirable to maintain the connected state in a good condition.

[0005] Therefore, an object of the present invention is to provide a shock absorber that can maintain a good connection state of the multiple divided bodies that make up the cap. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the shock absorber of the present invention comprises a cylinder, a piston rod provided within the cylinder and partially extending from the cylinder, and a cap provided at the end of the cylinder for inserting the piston rod, wherein the cap is formed from a plurality of divided bodies having a divided cylindrical portion arranged radially outside the cylinder and a divided bottom portion arranged at the axial end of the cylinder, the plurality of divided bodies having shapes formed to fit together, and the divided bottom portion having a first movement suppression portion that suppresses relative radial movement of the plurality of divided bodies when the plurality of divided bodies are fitted together. [Effects of the Invention]

[0007] According to the present invention, it is possible to maintain a good connection state of the plurality of divided bodies that make up the cap. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an exploded perspective view showing a shock absorber according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view showing a cap of the shock absorber according to the embodiment of the present invention. [Figure 3] FIG. 2 is a partial plan view showing a main portion of a cap of the shock absorber according to the embodiment of the present invention. [Figure 4] FIG. 1 is a partial cross-sectional view showing a main part of a first modified example of a shock absorber according to an embodiment of the present invention. [Figure 5] FIG. 10 is a partial cross-sectional view showing a main part of a second modified example of the shock absorber according to the embodiment of the present invention. [Figure 6] FIG. 10 is a partial cross-sectional view showing a main part of a third modified example of the shock absorber according to the embodiment of the present invention. [Figure 7] FIG. 10 is a partial cross-sectional view showing a main part of a fourth modified example of the shock absorber according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

[0010] 1 shows a shock absorber according to an embodiment. The shock absorber 11 according to the embodiment is used in a suspension device of a vehicle, specifically a four-wheeled automobile. The shock absorber 11 includes a shock absorber body 12 and a cap 13.

[0011] The shock absorber body 12 includes a cylinder 21, a piston rod 22, a seal member 23, a support member 24, and a mounting eye 25. The cylinder 21 is made of metal and has a cylindrical shape with a bottom. The piston rod 22 is made of metal and is provided inside the cylinder 21 with a portion thereof extending from the cylinder 21 . The seal member 23 is formed of a material containing rubber or the like having sealing properties. The cylinder 21 has an open end on the side from which the piston rod 22 extends, and the seal member 23 is provided at this end to close the gap between the cylinder 21 and the piston rod 22.

[0012] The support member 24 is made of metal and has an annular shape. The support member 24 is fixed coaxially to the piston rod 22 at an axially intermediate position of the portion of the piston rod 22 that extends from the cylinder 21. The outer diameter of the support member 24 is larger than the outer diameter of the portion of the piston rod 22 that is in sliding contact with the seal member 23 and extends from the cylinder 21. The support member 24 is, for example, a member that supports a cover (not shown) that covers the opening side of the cylinder 21 and the seal member 23.

[0013] The mounting eye 25 has an eye body 31 and a rubber bushing 32 . The eye body 31 is cylindrical and made of metal. The rubber bushing 32 has a rubber portion 35 and a connecting portion 36 . The rubber portion 35 is made of an elastic material such as rubber and has an annular shape. The connecting portion 36 is made of metal and has a cylindrical shape. The connecting portion 36 is provided radially inside the rubber portion 35 and extends from the rubber portion 35 on both sides in the axial direction of the rubber portion 35. The rubber bushing 32 is integrally formed by fixing a rubber portion 35 to the outer circumferential surface of the connecting portion 36. The rubber bushing 32 is fitted and fixed in the eye body 31 at the rubber portion 35. The mounting eye 25 is oriented perpendicular to the piston rod 22, and the eye body 31 is fixed by welding or the like to the tip of the portion of the piston rod 22 that extends from the cylinder 21. The mounting eye 25 has an outer diameter larger than the outer diameter of the portion of the piston rod 22 that slides against the seal member 23 and extends from the cylinder 21.

[0014] The cap 13 is made up of a plurality of identically shaped divided bodies, specifically two divided bodies 51. Since the divided bodies 51 have the same shape, the configuration will be explained mainly using one of the divided bodies 51 as an example.

[0015] The divided body 51 is made of synthetic resin and is formed seamlessly as a single piece by injection molding. The divided body 51 has a semi-cylindrical divided tubular portion 55 and a flat divided bottom portion 56 that extends radially inward from the axial end of the divided tubular portion 55.

[0016] The divided bottom portion 56 is a semicircular flat plate, and a semicircular divided hole portion 61 is formed radially inside the divided bottom portion 56 and penetrates the divided bottom portion 56 in the axial direction. The inner diameter of the divided hole portion 61 is larger than the outer diameter of the portion of the piston rod 22 that slides against the seal member 23 and extends from the cylinder 21, but is smaller than the outer diameters of the support member 24 and the mounting eye 25.

[0017] As shown in Fig. 2, the divided bottom portion 56 has a contact protrusion 63 formed on the radially inner side of one circumferential end thereof that protrudes outward in the circumferential direction, and a fitting protrusion 64 (first movement suppressing portion) that further protrudes outward in the circumferential direction of the divided bottom portion 56 is formed on the protruding tip side of the contact protrusion 63. As shown in Fig. 3, the fitting protrusion 64 has an isosceles trapezoidal shape that becomes wider toward the protruding tip side when the divided bottom portion 56 is viewed axially. The fitting protrusion 64 is provided on one circumferential end side of the divided bottom portion 56 and protrudes in the circumferential direction of the divided bottom portion 56.

[0018] As shown in FIG. 2, the divided bottom portion 56 has an abutment recess 66 formed on the radially inner side of the other circumferential end thereof, recessed circumferentially inward, and an engagement recess 67 (first movement suppressing portion) further recessed circumferentially inward of the divided bottom portion 56 on the recessed rear side of the abutment recess 66. As shown in FIG. 3, the engagement recess 67 has an isosceles trapezoidal shape that widens toward the rear in the recessed direction when the divided bottom portion 56 is viewed axially. The minimum width of the engagement recess 67 is narrower than the maximum width of the engagement protrusion 64. The engagement recess 67 is provided on the other circumferential end side of the divided bottom portion 56 and is recessed in the circumferential direction of the divided bottom portion 56.

[0019] 2, the split tubular portion 55 extends to one side from the radially outer edge of the split bottom portion 56 along the axial direction of the split bottom portion 56. The split tubular portion 55 has a semi-cylindrical split tubular base portion 70 on the split bottom portion 56 side in the axial direction. The split tubular base portion 70 has a plurality of fitting portions 75 formed at equal intervals in the circumferential direction of the split tubular base portion 70, which protrude radially inward of the split tubular base portion 70.

[0020] The split tubular portion 55 has a pair of curved cover plate portions 73 that extend from one and the other circumferential sides of the split tubular base portion 70 along the axial direction of the split tubular base portion 70 in the opposite direction to the split bottom portion 56. The pair of cover plate portions 73 are arc-shaped and coaxial with the split tubular base portion 70, and are arranged spaced apart from each other in the circumferential direction of the split tubular base portion 70.

[0021] The divided cylindrical portion 55 has a convex engaging portion 71 at one end in the circumferential direction of the divided cylindrical base portion 70, and a concave engaging portion 72 at the other end in the circumferential direction.

[0022] The convex engagement portion 71 has a base plate portion 81, an intermediate plate portion 82, an engagement plate portion 83, and a protrusion portion 85 (second movement suppressing portion).

[0023] The substrate portion 81 is in the form of a curved plate that extends from the radially outer side of one circumferential end of the divided cylindrical base portion 70 outward in the tangential direction of the divided cylindrical base portion 70. The substrate portion 81 is in the form of a circular arc that is approximately coaxial with the divided cylindrical base portion 70.

[0024] The intermediate plate portion 82 is in the form of a flat plate that extends from the extending tip of the base plate portion 81 along the radial direction of the divided cylindrical base portion 70 toward the concave engaging portion 72 side.

[0025] The engaging plate portion 83 is a flat plate extending from the extending tip of the intermediate plate portion 82 in the opposite direction to the divided cylindrical base portion 70, substantially parallel to the base plate portion 81.

[0026] The protrusion 85 protrudes in the opposite direction from the concave engagement portion 72 from the surface of the engagement plate portion 83 opposite the concave engagement portion 72 in the radial direction of the divided tubular base portion 70, and is formed at the central position in the axial direction of the divided tubular base portion 70 of the engagement plate portion 83, extending in the tangential direction of the divided tubular base portion 70.

[0027] The concave engagement portion 72 is provided on the opposite side of the split tubular base portion 70 from the convex engagement portion 71 in the circumferential and radial directions, and has a step portion 91, an engagement protrusion portion 92, a pair of protrusions 93, a pair of extension plate portions 94, a connecting plate portion 95, and a recess 96 (second movement suppression portion).

[0028] The step portion 91 is formed on the opposite side of the divided cylindrical base portion 70 from the convex engaging portion 71 in the circumferential and radial directions, and has a shape recessed radially inward of the divided cylindrical base portion 70.

[0029] The engaging ridge portion 92 is formed on the end portion of the divided tubular base portion 70 opposite the recessed engaging portion 72 in the circumferential direction, on the far side of the recessed direction of the step portion 91, and protrudes outward in the radial direction of the divided tubular base portion 70. The engaging ridge portion 92 is rib-shaped and extends in the axial direction of the divided tubular base portion 70.

[0030] The pair of protrusions 93 protrude radially outward from positions spaced apart in the axial direction of the split tubular base portion 70 on the edge portion of the step portion 91 opposite the engaging protrusion portion 92 in the circumferential direction of the split tubular base portion 70.

[0031] The pair of extending plate portions 94 are curved plate-like portions that extend outward in the tangential direction of the divided cylindrical base portion 70 from the protruding tip ends of the pair of protrusions 93. The pair of extending plate portions 94 are arc-shaped and coaxial with the divided cylindrical base portion 70.

[0032] The connecting plate portion 95 is a flat plate that connects the extending tip portions of the pair of extending plate portions 94 together, and extends in the axial direction of the divided cylindrical base portion 70.

[0033] The recess 96 is recessed in the opposite direction from the convex engagement portion 71 from the surface of the connecting plate portion 95 on the radial side of the divided tubular base portion 70, and is formed at the central position in the axial direction of the divided tubular base portion 70 of the connecting plate portion 95, extending circumferentially of the divided tubular base portion 70.

[0034] A pair of divided bodies 51 having the above-described structure are prepared, and these are assembled, for example, as follows to form the cap 13.

[0035] That is, first, the first segment 51 and the second segment 51 are shifted in the axial direction and are opposed to each other in the radial direction with the piston rod 22 of the shock absorber body 12 disposed in the respective segment holes 61. Then, the first segment 51 and the second segment 51 are moved relative to each other in the axial direction so that the engagement plate portion 83 of the convex engagement portion 71 of the second segment 51 is inserted between one of the extending plate portions 94 and connecting plate portion 95 of the concave engagement portion 72 of the first segment 51 and the stepped portion 91 and engaging ridge portion 92, while the engagement plate portion 83 of the convex engagement portion 71 of the first segment 51 is inserted between one of the extending plate portions 94 and connecting plate portion 95 of the concave engagement portion 72 of the second segment 51 and the stepped portion 91 and engaging ridge portion 92.

[0036] Thereafter, the pair of extending plate portions 94 and connecting plate portion 95 of the concave engaging portion 72 of the first divisional body 51 and the pair of extending plate portions 94 and connecting plate portion 95 of the concave engaging portion 72 of the second divisional body 51 are elastically deformed so as to widen the gap in opposite directions in the radial direction of the divided tubular base portion 70, while the first divisional body 51 and the second divisional body 51 are further moved relative to each other in the axial direction to engage the engaging protrusion 64 of the second divisional body 51 with the engaging recess 67 of the first divisional body 51, and the engaging protrusion 64 of the first divisional body 51 with the engaging recess 67 of the second divisional body 51. Thereafter, the elastic deformation of the pair of extending plate portions 94 and connecting plate portion 95 of the concave engaging portion 72 of the first divisional body 51 and the pair of extending plate portions 94 and connecting plate portion 95 of the concave engaging portion 72 of the second divisional body 51 is released.

[0037] Then, the fitting protrusion 64 of the second divided body 51 fits into the fitting recess 67 of the first divided body 51, the fitting protrusion 64 of the first divided body 51 fits into the fitting recess 67 of the second divided body 51, the abutting protrusion 63 of the first divided body 51 abuts against the abutting recess 66 of the second divided body 51, the abutting protrusion 63 of the second divided body 51 abuts against the abutting recess 66 of the first divided body 51, and the protrusion 8 of the convex engaging portion 71 of the second divided body 51 fits into the recess 96 of the concave engaging portion 72 of the first divided body 51. 5 are fitted together, the protrusion 85 of the convex engagement portion 71 of the first partition 51 is fitted into the recess 96 of the concave engagement portion 72 of the second partition 51, the pair of extending plate portions 94 and connecting plate portion 95 of the concave engagement portion 72 of the first partition 51 and the step portion 91 clamp the engagement plate portion 83 of the convex engagement portion 71 of the second partition 51, and the pair of extending plate portions 94 and connecting plate portion 95 of the concave engagement portion 72 of the second partition 51 and the step portion 91 clamp the engagement plate portion 83 of the convex engagement portion 71 of the first partition 51.

[0038] In this manner, the first divided body 51 and the second divided body 51 are fitted together to form the cap 13.

[0039] The cap 13 has a recess 96 of the first divided body 51 and a protrusion 85 of the second divided body 51 that are provided at radially opposing portions perpendicular to the arrangement direction of the pair of divided cylindrical portions 55 and fit together, and a recess 96 of the second divided body 51 and a protrusion 85 of the first divided body 51 that are provided at radially opposing portions perpendicular to the arrangement direction of the pair of divided cylindrical portions 55 and fit together, thereby suppressing relative axial movement between the first divided body 51 and the second divided body 51.

[0040] In addition, the cap 13 has an engaging protrusion portion 92 of the concave engaging portion 72 of the first divided body 51 and an engaging plate portion 83 of the convex engaging portion 71 of the second divided body 51, which are opposed in the radial direction (circumferential direction) along the arrangement direction of the pair of divided cylindrical portions 55, and an engaging protrusion portion 92 of the concave engaging portion 72 of the second divided body 51 and an engaging plate portion 83 of the convex engaging portion 71 of the first divided body 51, which are opposed in the radial direction (circumferential direction) along the arrangement direction of the pair of divided cylindrical portions 55, which suppress relative movement of the first divided body 51 and the second divided body 51 on the radially spaced apart side along the arrangement direction of the pair of divided cylindrical portions 55.

[0041] In addition, the cap 13 has a mating recess 67 of the first divided body 51 and a mating protrusion 64 of the second divided body 51 that are provided at opposing radial (circumferential) portions along the alignment direction of the pair of divided bottoms 56 and fit into each other, and the mating recess 67 of the second divided body 51 and the mating protrusion 64 of the first divided body 51 that are provided at opposing radial (circumferential) portions along the alignment direction of the pair of divided bottoms 56 and fit into each other, thereby suppressing relative movement between the first divided body 51 and the second divided body 51 on the radially spaced apart side along the alignment direction, and also suppressing relative movement in the radial direction perpendicular to the alignment direction of the first divided body 51 and the second divided body 51.

[0042] In addition, the cap 13 has a configuration in which the abutment recess 66 of the first divided body 51 and the abutment protrusion 63 of the second divided body 51 abut in the radial direction (circumferential direction) along the arrangement direction of the pair of divided bottom portions 56, and also abut in the radial direction perpendicular to the arrangement direction of the pair of divided bottom portions 56, and the abutment recess 66 of the second divided body 51 and the abutment protrusion 63 of the first divided body 51 abut in the radial direction (circumferential direction) along the arrangement direction of the pair of divided bottom portions 56, and also abut in the radial direction perpendicular to the arrangement direction of the pair of divided bottom portions 56.

[0043] In addition, the cap 13 has a pair of divided bottom portions 56 that are one flat plate, a pair of divided tubular base portions 70 that are one cylinder, and a pair of divided hole portions 61 of the pair of divided bottom portions 56 that are one circular hole.

[0044] The cap 13, which is provided and integrated as described above to allow the piston rod 22 to pass through, is press-fitted and fixed to the outer periphery of the end of the cylinder 21 on the seal member 23 side at the multiple fitting portions 75 of the pair of split cylindrical portions 55 of the pair of segments 51. Then, the pair of split cylindrical portions 55 of the cap 13 are disposed radially outside the cylinder 21, covering the outer periphery of the cylinder 21 on the radial outside, and the pair of split bottom portions 56 are disposed axially at the end of the cylinder 21, covering the opening side of the cylinder 21 and the seal member 23 on the axial outside.

[0045] As described above, the cap 13 is formed from multiple segments 51, each having a divided tubular portion 55 disposed radially outside the cylinder 21 and a divided bottom portion 56 disposed at the axial end of the cylinder 21. The multiple segments 51 are shaped to fit together, and the divided bottom portion 56 has a fitting protrusion 64 and a fitting recess 67 that suppress relative radial movement of the multiple segments 51 when the multiple segments 51 are fitted together. The divided tubular portion 55 has an engaging ridge 92 and an engaging plate 83 that suppress relative radial movement of the multiple segments 51 when the multiple segments 51 are fitted together. The divided tubular portion 55 also has a protrusion 85 and a recess 96 that suppress relative axial movement of the multiple segments 51 when the multiple segments 51 are fitted together.

[0046] To remove the cap 13 from the cylinder 21 and the piston rod 22, the pair of split bodies 51 can be disassembled in the reverse order to the above.

[0047] Patent Document 1 discloses a shock absorber in which the side of the cylinder where the rod protrudes is covered with a cap. However, if the shock absorber has a portion on the opposite side of the piston rod extending from the cylinder that has a larger outer diameter than the piston rod, and the cap covering the radially outer and axial ends of the cylinder is constructed as a single part, it becomes difficult to install. For this reason, it is conceivable to construct the cap by connecting multiple segments. In this case, it is desirable to maintain a good connection state.

[0048] In the shock absorber 11 of this embodiment, the cap 13 is formed from multiple segments 51, each having a divided cylindrical portion 55 disposed radially outside the cylinder 21 and a divided bottom portion 56 disposed at the axial end of the cylinder 21. Therefore, even if a support member 24 or a mounting eye 25, for example, with a larger outer diameter than the portion of the piston rod 22 extending from the cylinder 21 is fixed to the opposite side of the cylinder 21 from the portion of the piston rod 22 extending from the cylinder 21, the cap 13 can be attached to the shock absorber 11. Furthermore, when the multiple segments 51 are fitted together, the divided bottom portion 56 has a fitting protrusion 64 and a fitting recess 67 that restrict relative radial movement of the multiple segments 51. This makes it possible to maintain a good connection between the multiple segments 51 that make up the cap 13.

[0049] Furthermore, in the shock absorber 11, the divided cylindrical portions 55 of the divided bodies 51 have protrusions 85 and recesses 96 that suppress relative axial movement of the divided bodies 51 when the divided bodies 51 are fitted together. This makes it possible to more effectively maintain the connection state of the divided bodies 51 that make up the cap 13. Note that the protrusions 85 and recesses 96 are not limited to shapes that extend in the circumferential direction of the divided cylindrical portion 55, and may be circular protrusions and recesses.

[0050] Furthermore, in the shock absorber 11, the divided cylindrical portions 55 of the multiple divided bodies 51 have engaging ridges 92 and engaging plates 83 that suppress relative radial movement of the multiple divided bodies 51 when the multiple divided bodies 51 are fitted together. This makes it possible to maintain the connected state of the multiple divided bodies 51 that make up the cap 13 even better.

[0051] The shock absorber 11 of the first embodiment can also be modified as in the following Modifications 1 to 4.

[0052] <Variation 1> As shown in FIG. 4 , a circular rib 101 (third movement suppressing portion) that is convex outward in the radial direction is formed around the entire circumference of the outer peripheral surface of the cylinder 21, the outer peripheral surface being covered by the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13, for example, by bulge molding. At the same time, grooves 102 (third movement suppressing portion) that are concave outward in the radial direction of the cap 13 and extend in the circumferential direction of the cap 13 are formed in each of the multiple fitting portions 75 of the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13, into which the rib 101 is fitted. With the cap 13 attached to the cylinder 21, the continuous circular rib 101 fits into the multiple discontinuous (in other words, intermittently) circular grooves 102. As a result, even if the cap 13 and the cylinder 21 attempt to move relative to each other in the axial direction, the side wall surfaces of the rib 101 and the grooves 102 that face each other in the axial direction come into contact with each other to suppress this relative movement.

[0053] In this way, in variant example 1, the split tubular portion 55 and the cylinder 21 have an uneven shape that allows them to fit together, and have groove portions 102 and ribs 101 that suppress relative movement in the axial direction, so that relative movement of the cap 13 with respect to the cylinder 21 in the axial direction, i.e., relative movement in the removal direction, can be suppressed.

[0054] <Variation 2> 5, a radially inwardly concave annular groove 111 (third movement suppressing portion) is formed around the entire circumference of the outer peripheral surface of the portion of the cylinder 21 whose radially outer side is covered by the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13. At the same time, a rib 112 (third movement suppressing portion) that is convex radially inward of the cap 13, extends circumferentially of the cap 13, and fits into the groove 111 is formed on each of the plurality of fitting portions 75 of the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13. When the cap 13 is attached to the cylinder 21, the plurality of discontinuous annular ribs 112 fit into the continuous annular groove 111. As a result, even if the cap 13 and the cylinder 21 attempt to move relative to each other in the axial direction, the side wall surfaces of the groove 111 and the side wall surfaces of the plurality of ribs 112 that face each other in the axial direction come into contact with each other to suppress this relative movement.

[0055] In this way, in variant example 2, the cylinder 21 and the split tubular portion 55 have an uneven shape that can be fitted together, and have groove portions 111 and ribs 112 that suppress relative movement in the axial direction, so that relative movement of the cap 13 to the cylinder 21 in the axial direction, i.e., relative movement in the removal direction, can be suppressed.

[0056] <Variation 3> As shown in Figure 6, groove portions 121 (first groove portions) that are concave radially outward of the cap 13 and extend circumferentially of the cap 13 are formed in each of the multiple fitting portions 75 of the pair of split tubular portions 55 of the pair of split bodies 51 of the cap 13, and these discontinuous, annular groove portions 121 are provided with an O-ring 122 (movement suppression member) made of a high-friction material such as annular rubber that abuts against the outer peripheral surface of the cylinder 21 and suppresses relative movement of the cap 13 with respect to the cylinder 21 by friction.

[0057] As a result, in variant example 3, the O-ring 122 held in the discontinuous, annular groove portion 121 of the cap 13 generates a frictional force between the O-ring 122 and the outer surface of the cylinder 21, thereby suppressing relative axial movement of the cap 13 with respect to the cylinder 21, i.e., relative movement in the removal direction, and also suppressing relative circumferential movement of the cap 13 with respect to the cylinder 21.

[0058] In addition, a circular groove portion that is concave radially inward may be formed around the entire outer peripheral surface of the portion of the cylinder 21 that is covered radially outward by the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13, and an O-ring made of a high-friction material such as circular rubber may be provided in this groove portion so as to abut against each of the multiple fitting portions 75 of the pair of divided cylindrical portions 55 of the pair of divided bodies 51 of the cap 13, thereby suppressing relative movement of the cap 13 with respect to the cylinder 21 by friction.

[0059] <Variation 4> 7, first grooves 131 that are recessed radially outward and extend circumferentially of the cap 13 are formed in each of the multiple fitting portions 75 of the pair of split cylindrical portions 55 of the pair of segments 51 of the cap 13. At the same time, annular second grooves 132 that are recessed radially inward are formed around the entire circumference of the outer circumferential surface of the cylinder 21 in a portion of the cylinder 21 whose radially outer side is covered by the pair of split cylindrical portions 55 of the pair of segments 51 of the cap 13. An O-ring 133 (movement suppressing member) made of an elastic material such as rubber is provided so as to straddle both the multiple discontinuous annular first grooves 131 and the continuous annular second groove 132.

[0060] As a result, in variant 4, the O-ring 122, which is arranged to straddle both the discontinuous, annular first groove portion 131 of the cap 13 and the continuous, annular second groove portion 132 of the cylinder 21, simultaneously abuts against the side wall surfaces of the first groove portion 131 and the second groove portion 132 that face each other in the axial direction, even if the cap 13 and the cylinder 21 attempt to move relative to each other in the axial direction, thereby suppressing this relative movement.

[0061] Instead of the O-ring 133 made of an elastic material such as rubber, a C-shaped C-ring made of metal or synthetic resin can be fitted into the continuous annular second groove portion 132 of the cylinder 21, and the C-ring can be provided so as to straddle both the multiple first groove portions 131 and the second groove portions 132. In this case, even if the cap 13 and the cylinder 21 attempt to move relative to each other in the axial direction, the C-ring will simultaneously abut against the side wall surfaces of the first groove portion 131 and the second groove portion 132 that face each other in the axial direction, thereby suppressing this relative movement. [Explanation of symbols]

[0062] 11...shock absorber, 13...cap, 21...cylinder, 22...piston rod, 51...divided body, 55...divided cylindrical portion, 56...divided bottom portion, 64...fitting protrusion (first movement suppressing portion), 67...fitting recess (first movement suppressing portion), 85...protrusion (second movement suppressing portion), 96...recess (second movement suppressing portion), 101...rib (third movement suppressing portion), 102...groove (third movement suppressing portion), 111...groove (third movement suppressing portion), 112...rib (third movement suppressing portion), 121...groove (first groove portion), 122...O-ring (movement suppressing member), 131...first groove portion, 132...second groove portion, 133...O-ring (movement suppressing member).

Claims

1. A cylinder; a piston rod provided within the cylinder and partially extending from the cylinder; a cap provided at an end of the cylinder and configured to allow the piston rod to pass through; The cap is The cylinder is formed from a plurality of divided bodies, each having a divided cylindrical portion disposed radially outward of the cylinder and a divided bottom portion disposed at an axial end of the cylinder, The plurality of divided bodies are shaped to fit together, The divided bottom portion has a first movement suppressing portion that suppresses relative radial movement of the plurality of divided bodies when the plurality of divided bodies are fitted together.

2. The shock absorber according to claim 1, The divided cylindrical portion has a second movement suppressing portion that suppresses relative axial movement of the divided bodies when the divided bodies are fitted together.

3. The shock absorber according to claim 1 or 2, The split cylindrical portion and the cylinder have a concave-convex shape that can be fitted together, and the shock absorber has a third movement suppressing portion that suppresses relative movement in the axial direction.

4. The shock absorber according to claim 1 or 2, the divided cylindrical portion has an annular first groove portion, A shock absorber in which a movement suppressing member that suppresses relative movement with respect to the cylinder is provided in the first groove portion.

5. The shock absorber according to claim 4, the cylinder has an annular second groove; The movement suppressing member is provided so as to straddle both the first groove portion and the second groove portion.

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