Buffer

Abstract

This shock absorber comprises a cylinder, a piston that is slidably provided inside of the cylinder, and a piston rod that is coupled to the piston, the shock absorber comprising: a first movement inhibition part that is provided to a cylindrical part of the cylinder and that projects outward in the radial direction; a spring receiving member that comes into contact with the first movement inhibition part so as to inhibit movement of the cylinder in the axial direction and that has a cylindrical tube part which covers at least part of the cylinder and a seating part in which a suspension spring is seated; and a second movement inhibition part that comes into contact with the tube part and the outer peripheral surface of the cylinder and that inhibits relative movement of the cylinder and the spring receiving member in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a shock absorber. This application claims priority based on Japanese Patent Application No. 2022-011408 filed in Japan on January 28, 2022, and incorporates its content herein by reference.

Background Art

[0002] There is a shock absorber having a structure in which an annular groove is formed on the outer peripheral portion of a cylinder, a substantially C-shaped locking ring is fitted into this annular groove, and a spring seat is supported on the cylinder by this locking ring (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is required to suppress relative movement between a cylinder and a spring receiving member.

[0005] An object of the present invention is to provide a shock absorber capable of suppressing relative movement between a cylinder and a spring receiving member.

Means for Solving the Problems

[0006] In order to achieve the above object, a shock absorber according to a first aspect of the present invention is a shock absorber including a cylinder, a piston slidably provided in the cylinder, and a piston rod connected to the piston. The shock absorber is provided with a first movement restricting portion provided on a cylindrical portion of the cylinder and protruding radially outward, a cylindrical tubular portion covering at least a part of the cylinder, and a seating portion on which a suspension spring is seated. The shock absorber further includes a spring receiving member that abuts against the first movement restricting portion to restrict axial movement of the cylinder, and a second movement restricting portion that abuts against an outer peripheral surface of the cylinder and the tubular portion to restrict circumferential relative movement between the cylinder and the spring receiving member.

[0007] A shock absorber according to a second aspect of the present invention is a shock absorber including a cylinder, a piston slidably provided in the cylinder, and a piston rod connected to the piston. The shock absorber includes a spring receiving member disposed on an outer peripheral surface side of the cylinder and having a cylindrical tubular portion covering at least a part of the cylinder and a seating portion on which a suspension spring is seated, a first movement restricting portion provided on the outer peripheral surface of the cylinder to restrict axial movement of the spring receiving member, a communication portion provided in the tubular portion to communicate an outer peripheral surface side of the cylinder and an outer peripheral surface side of the tubular portion, and a second movement restricting portion having at least a part of an inner peripheral surface abutting against the outer peripheral surface of the tubular portion and the outer peripheral surface of the cylinder and having a surface facing the tubular portion and a surface facing the cylinder.

Advantages of the Invention

[0008] According to the present invention, relative movement between the cylinder and the spring receiving member can be restricted.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

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Figure 11

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Figure 15

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Figure 18

Figure 19

Figure 20

Modes for Carrying Out the Invention

[0010] [First Embodiment] Embodiments of the present invention will be described below with reference to the drawings.

[0011] First, the shock absorber 11 of the first embodiment will be described with reference to FIGS. 1 to 3. The shock absorber 11 shown in FIG. 1 is a shock absorber used in a suspension device of a vehicle such as an automobile or a railway vehicle. Specifically, the shock absorber 11 is a shock absorber used in a suspension device of an automobile.

[0012] The shock absorber 11 includes a cylinder 21. The shock absorber 11 is a single-tube type shock absorber having a single-tube cylinder 21, that is, a so-called monotube type shock absorber. The cylinder 21 is cylindrical, specifically, bottomed cylindrical. The cylinder 21 has a body portion 22 and a bottom portion 23. The body portion 22 is cylindrical. The bottom portion 23 is disk-shaped and closes one end portion in the axial direction of the body portion 22. The other end portion on the side opposite to the bottom portion 23 of the body portion 22 is an opening 24. The cylinder 21 is an integrally formed product made of a single metal member.

[0013] In the axial direction of the body portion 22, from the bottom portion 23 side in order, there are a first cylindrical portion 31 (cylindrical portion), an intermediate locking portion 32, a second cylindrical portion 33, and an end locking portion 34. The first cylindrical portion 31 is cylindrical over the entire length in its axial direction, and in its axial direction, from the bottom portion 23 side in order, there are a first large-diameter portion 41, a small-diameter portion 42, and a second large-diameter portion 43.

[0014] The first large-diameter portion 41 has an outer peripheral surface on the outer side in the radial direction that is cylindrical, and an inner peripheral surface on the inner side in the radial direction that is cylindrical and coaxial with this outer peripheral surface. The small-diameter portion 42 has an outer peripheral surface on the outer side in the radial direction that is cylindrical, and an inner peripheral surface on the inner side in the radial direction that is cylindrical and coaxial with this outer peripheral surface. The inner diameter of the small-diameter portion 42 is equal to the inner diameter of the first large-diameter portion 41, and its outer diameter is smaller than the outer diameter of the first large-diameter portion 41. The second large-diameter portion 43 has an outer peripheral surface on its radially outer side that is cylindrical, and an inner peripheral surface on its radially inner side that is cylindrical and coaxial with this outer peripheral surface. The outer diameter of the second large-diameter portion 43 is equal to the outer diameter of the first large-diameter portion 41, and its inner diameter is equal to the inner diameter of the first large-diameter portion 41. The first large-diameter portion 41, the small-diameter portion 42, and the second large-diameter portion 43 have a common central axis, and this central axis is the central axis of the first cylindrical portion 31.

[0015] Therefore, the first cylindrical portion 31 has, between the first large-diameter portion 41 and the second large-diameter portion 43 in its axial direction, a fitting groove 45 formed on the outer diameter side of the small-diameter portion 42. The fitting groove 45 is recessed inward in the radial direction from the outer peripheral surface of the first large-diameter portion 41 and the outer peripheral surface of the second large-diameter portion 43. The fitting groove 45 is annular.

[0016] The second cylindrical portion 33 is cylindrical over its entire axial length. The outer peripheral surface on the radially outer side of the second cylindrical portion 33 is cylindrical, and the inner peripheral surface on the radially inner side thereof is cylindrical and coaxial with this outer peripheral surface. The outer diameter of the second cylindrical portion 33 is equal to the outer diameters of the first large-diameter portion 41 and the second large-diameter portion 43, and its inner diameter is equal to the inner diameters of the first large-diameter portion 41 and the second large-diameter portion 43. The second cylindrical portion 33 and the first cylindrical portion 31 have a common central axis.

[0017] The intermediate locking portion 32 is recessed inward in the radial direction from the outer peripheral surface of the second cylindrical portion 33 and the outer peripheral surface of the second large-diameter portion 43. The intermediate locking portion 32 protrudes inward in the radial direction from the inner peripheral surface of the second cylindrical portion 33 and the inner peripheral surface of the second large-diameter portion 43. The intermediate locking portion 32 is annular. The end locking portion 34 protrudes inward in the radial direction of the second cylindrical portion 33 from the inner peripheral surface of the second cylindrical portion 33. The end locking portion 34 is annular. The inside in the radial direction of the end locking portion 34 is an opening 24.

[0018] Here, before completion, the body portion 22 is cylindrical with a constant inner diameter over the entire axial length and a constant outer diameter over the entire axial length. By plastically deforming the body portion 22 in this state before completion, the intermediate locking portion 32 and the end locking portion 34 are formed, and the body portion 22 is completed.

[0019] The shock absorber 11 includes a rod guide 51. The rod guide 51 is annular and is fitted into the second cylindrical portion 33 of the cylinder 21. The bottom portion 23 side of the rod guide 51 in the axial direction abuts against the intermediate locking portion 32.

[0020] The shock absorber 11 includes a seal member 52. The seal member 52 is annular and is provided on the opening 24 side of the cylinder 21 rather than the rod guide 51. Here, the seal member 52 is also fitted into the second cylindrical portion 33 of the cylinder 21 in the same manner as the rod guide 51. The seal member 52 is sandwiched between the end locking portion 34 and the rod guide 51 in the axial direction of the cylinder 21. The seal member 52 closes the opening 24 of the cylinder 21.

[0021] The shock absorber 11 includes a piston 55 and a free piston 56. Both the piston 55 and the free piston 56 are slidably provided in the first cylindrical portion 31 of the cylinder 21. The piston 55 is on the opening 24 side of the free piston 56 in the axial direction of the cylinder 21. The piston 55 defines two chambers, a first chamber 58 and a second chamber 59, in the cylinder 21. The free piston 56 defines two chambers, a second chamber 59 and a gas chamber 60, in the cylinder 21. The first chamber 58 is the portion between the piston 55 and the rod guide 51 in the cylinder 21. The second chamber 59 is the portion between the piston 55 and the free piston 56 in the cylinder 21. The gas chamber 60 is the portion between the free piston 56 and the bottom portion 23 in the cylinder 21. The first chamber 58 and the second chamber 59 are filled with an oil liquid L as a working fluid. The gas chamber 60 is filled with a gas G as a working fluid.

[0022] The buffer 11 includes a piston rod 65 and a nut 66. The piston rod 65 is inserted into the body 22 of the cylinder 21, and one axial end thereof is connected to the piston 55. The piston rod 65 extends outward from the cylinder 21 through the opening 24 on the side opposite to the piston 55 in the axial direction. The piston 55 is connected to the piston rod 65 by a nut 66.

[0023] The piston rod 65 is made of metal and has a main shaft portion 71 and a mounting shaft portion 72. The main shaft portion 71 is cylindrical. The outer peripheral surface of the main shaft portion 71 is a cylindrical surface. The mounting shaft portion 72 is cylindrical and has an outer diameter smaller than that of the main shaft portion 71. A male thread 73 is formed on the outer peripheral portion of the mounting shaft portion 72 on the side opposite to the main shaft portion 71 in the axial direction. The piston 55 is fitted onto the mounting shaft portion 72. The nut 66 is screwed onto the male thread 73 of the mounting shaft portion 72.

[0024] The piston rod 65 extends outward from the cylinder 21 through the rod guide 51 and the seal member 52 at the main shaft portion 71. In other words, the main shaft portion 71 of the piston rod 65 is inserted into the rod guide 51 and the seal member 52. The piston rod 65 is in sliding contact with the rod guide 51 on the outer peripheral surface of the main shaft portion 71. The piston rod 65 is guided by the rod guide 51 and moves axially integrally with the piston 55 with respect to the cylinder 21. The piston rod 65 is in sliding contact with the seal member 52 on the outer peripheral surface of the main shaft portion 71. The seal member 52 seals the space between the second cylinder portion 33 of the cylinder 21 and the piston rod 65. The seal member 52 suppresses the leakage of the oil fluid L in the cylinder 21 to the outside.

[0025] Passages 75 and 76 are formed in the piston 55. The passages 75 and 76 penetrate the piston 55 in the axial direction of the piston 55. The passages 75 and 76 enable the first chamber 58 and the second chamber 59 to communicate with each other. The shock absorber 11 is provided with a disk valve 77. The disk valve 77 is provided on the side opposite to the bottom portion 23 in the axial direction of the piston 55. The disk valve 77 is annular, and closes the passage 75 by contacting the piston 55. The shock absorber 11 has a disk valve 78. The disk valve 78 is provided on the bottom portion 23 side in the axial direction of the piston 55. The disk valve 78 is annular, and closes the passage 76 by contacting the piston 55.

[0026] The direction in which the piston rod 65 increases the amount of entry into the cylinder 21 is defined as the contraction side. When the piston rod 65 moves to the contraction side, the piston 55 moves in the direction of narrowing the second chamber 59. As a result, when the pressure in the second chamber 59 becomes higher than the pressure in the first chamber 58 by a predetermined value or more, the disk valve 77 opens the passage 75 and allows the hydraulic fluid L in the second chamber 59 to flow into the first chamber 58 through the passage 75. At that time, the disk valve 77 generates a damping force.

[0027] The direction in which the piston rod 65 increases the amount of protrusion from the cylinder 21 is defined as the extension side. When the piston rod 65 moves to the extension side, the piston 55 moves in the direction of narrowing the first chamber 58. As a result, when the pressure in the first chamber 58 becomes higher than the pressure in the second chamber 59 by a predetermined value or more, the disk valve 78 opens the passage 76 and allows the hydraulic fluid L in the first chamber 58 to flow into the second chamber 59 through the passage 76. At that time, the disk valve 78 generates a damping force.

[0028] At least one of the piston 55 and the disk valve 77 is formed with a fixed orifice (not shown). This fixed orifice communicates the first chamber 58 and the second chamber 59 through the passage 75 even when the disk valve 77 closes the passage 75 most tightly. Also, at least one of the piston 55 and the disk valve 78 is formed with a fixed orifice (not shown). This fixed orifice communicates the first chamber 58 and the second chamber 59 through the passage 76 even when the disk valve 78 closes the passage 76 most tightly.

[0029] The free piston 56 moves axially with respect to the cylinder 21 in accordance with a change in the amount of entry into the first chamber 58 of the piston rod 65. That is, when the piston rod 65 increases the amount of entry into the first chamber 58, the free piston 56 moves toward the bottom 23 side according to its volume, and when the piston rod 65 decreases the amount of entry into the first chamber 58, the free piston 56 moves to the side opposite to the bottom 23 according to its volume.

[0030] The shock absorber 11 includes a mounting eye 80 that is fixed by welding to the outer surface of the bottom 23 on the side opposite to the body portion 22 in the axial direction. The shock absorber 11 is arranged such that the piston rod 65 is disposed at the upper part and connected to the vehicle body side, and the mounting eye 80 is disposed at the lower part and connected to the vehicle wheel side. Therefore, the shock absorber 11 generates a damping force against the movement of the wheel with respect to the vehicle body. Here, the mounting eye 80 is attached to the wheel side mounting portion such that the position in the circumferential direction of the cylinder 21 is set to a specified position.

[0031] The shock absorber 11 includes a contact ring 81 (first movement suppression portion). The contact ring 81 is made of metal and is a C-shaped C-ring formed by dividing a portion of an annular ring in the circumferential direction. The outer peripheral surface of the contact ring 81 on the outer side in the radial direction is in the shape of a cylindrical surface, and the inner peripheral surface on the inner side in the radial direction is in the shape of a cylindrical surface coaxial with this outer peripheral surface. The axial thickness of the contact ring 81 is smaller than the radial width. The contact ring 81 is fitted into a fitting groove 45 provided in the first cylindrical portion 31 of the cylinder 21. The inner diameter of the contact ring 81 before fitting into the fitting groove 45 is slightly smaller than the outer diameter of the small diameter portion 42 of the cylinder 21, in other words, the groove bottom diameter of the fitting groove 45. Therefore, the contact ring 81 abuts against and is pressed against the groove bottom surface on the inner side in the recessed direction of the fitting groove 45.

[0032] In a state where the contact ring 81 is fitted into the fitting groove 45, its outer diameter is larger than the outer diameters of the first large diameter portion 41 and the second large diameter portion 43. Therefore, the contact ring 81 is provided on the first cylindrical portion 31 of the cylinder 21 and protrudes radially outward from the first cylindrical portion 31 of the cylinder 21. When the contact ring 81 fits into the fitting groove 45, the movement of the contact ring 81 toward the bottom 23 side in the axial direction of the cylinder 21 is restricted by abutting against the end face on the small-diameter part 42 side in the axial direction of the first large-diameter part 41. Also, when the contact ring 81 fits into the fitting groove 45, the movement of the contact ring 81 toward the side opposite to the bottom 23 in the axial direction of the cylinder 21 is restricted by abutting against the end face on the small-diameter part 42 side in the axial direction of the second large-diameter part 43. Therefore, when the contact ring 81 fits into the fitting groove 45, the movement of the contact ring 81 to both sides in the axial direction of the cylinder 21 is restricted.

[0033] The shock absorber 11 includes a spring receiving member 91. The spring receiving member 91 is an integrally formed product made of a single metal member. The spring receiving member 91 is generally cylindrical and has a cylindrical tube portion 92 and a flange-shaped seating portion 93. The tube portion 92 is at one end side in the axial direction of the spring receiving member 91, and the seating portion 93 is at the other end side in the axial direction of the spring receiving member 91.

[0034] The tube portion 92 has, in order from the side opposite to the axial seating portion 93, a small-diameter tube portion 101, a contact portion 102, and a large-diameter tube portion 103. The outer peripheral surface on the outer side in the radial direction of the small-diameter tube portion 101 is cylindrical, and the inner peripheral surface on the inner side in the radial direction of the small-diameter tube portion 101 is cylindrical and coaxial with the outer peripheral surface. As shown in FIG. 2, the small-diameter tube portion 101 has a groove portion 111 (communication portion) at the tip end portion on the side opposite to the contact portion 102 in the axial direction. The groove portion 111 is formed to be notched and recessed from the tip end face on the side opposite to the contact portion 102 in the axial direction of the small-diameter tube portion 101 toward the contact portion 102 side in the axial direction of the small-diameter tube portion 101. The tip end face of the small-diameter tube portion 101 where the groove portion 111 is formed is the end face on the side opposite to the seating portion 93 in the axial direction of the tube portion 92. The groove portion 111 penetrates the small-diameter tube portion 101 in the radial direction from its inner peripheral surface to its outer peripheral surface. The groove portion 111 is formed such that at least a part of the axial length of the tube portion 92 is shortened. A plurality of groove portions 111 having the same shape are formed at equal intervals in the circumferential direction of the small-diameter tube portion 101, specifically, at three locations, as shown in FIG. 3.

[0035] As shown in FIG. 2, the small-diameter cylindrical portion 101 has a base portion 115 and an extension portion 116. The base portion 115 is provided on the side of the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101, and has a cylindrical shape over the entire axial length thereof. The end face of the base portion 115 on the side opposite to the contact portion 102 in the axial direction is a plane that extends perpendicular to its central axis. The extension portion 116 extends from this base portion 115 to the side opposite to the contact portion 102 in the axial direction. All the groove portions 111 of the small-diameter cylindrical portion 101 have the groove bottom surfaces on the inner side in the recessed direction arranged on the same plane. A plurality of extension portions 116 having the same shape are formed at equal intervals in the circumferential direction of the small-diameter cylindrical portion 101, specifically, at three locations. The length of the small-diameter cylindrical portion 101 in the circumferential direction is longer for the groove portion 111 than for the extension portion 116.

[0036] As shown in FIG. 1, the large-diameter cylindrical portion 103 has an outer peripheral surface on the outer side in the radial direction that is cylindrical, and an inner peripheral surface on the inner side in the radial direction that is a cylindrical surface coaxial with this outer peripheral surface. The inner diameter of the large-diameter cylindrical portion 103 is larger than the inner diameter of the small-diameter cylindrical portion 101, and the outer diameter of the large-diameter cylindrical portion 103 is larger than the outer diameter of the small-diameter cylindrical portion 101. The contact portion 102 slightly extends outward in the radial direction of the small-diameter cylindrical portion 101 from the edge portion on the side of the large-diameter cylindrical portion 103 in the axial direction of the small-diameter cylindrical portion 101. The contact portion 102 is annular. The outer edge portion of the contact portion 102 in the radial direction is connected to the edge portion on the side of the small-diameter cylindrical portion 101 in the axial direction of the large-diameter cylindrical portion 103.

[0037] The seating portion 93 has, in order from the side of the cylindrical portion 92 in the axial direction, an intermediate flange portion 121, a cylindrical portion 122, and an end flange portion 123. The intermediate flange portion 121 extends outward in the radial direction of the large-diameter cylindrical portion 103 from the edge portion on the side opposite to the small-diameter cylindrical portion 101 in the axial direction of the large-diameter cylindrical portion 103.

[0038] The cylindrical portion 122 extends from the outer peripheral edge portion on the radially outer side of the intermediate flange portion 121 in the axial direction of the intermediate flange portion 121 to the side opposite to the large-diameter cylindrical portion 103. The cylindrical portion 122 is cylindrical. The inner diameter of the cylindrical portion 122 is larger than the inner diameter of the large-diameter cylindrical portion 103, and the outer diameter of the cylindrical portion 122 is larger than the outer diameter of the large-diameter cylindrical portion 103. The end flange portion 123 extends outward in the radial direction of the cylindrical portion 122 from the edge portion on the side opposite to the intermediate flange portion 121 in the axial direction of the cylindrical portion 122.

[0039] The spring receiving member 91 is to be put on the body portion 22 of the cylinder 21 from the axial opening 24 side with the end flange portion 123 at the front. Then, the spring receiving member 91 fits into the second cylindrical portion 33 of the cylinder 21 in the small-diameter cylindrical portion 101 of the cylindrical portion 92, and then fits into the second large-diameter portion 43 of the first cylindrical portion 31. And finally, the spring receiving member 91 fits into the contact ring 81 in the large-diameter cylindrical portion 103 and contacts the end face on the axial opening 24 side of the contact ring 81 at the contact portion 102. In this state, the spring receiving member 91 is restricted from moving toward the bottom portion 23 side beyond the contact ring 81 in the axial direction of the cylinder 21. In other words, the spring receiving member 91 contacts the contact ring 81 and the axial movement of the cylinder 21 is suppressed. In other words, the contact ring 81 is provided on the outer peripheral surface of the cylinder 21 to suppress the axial movement of the spring receiving member 91.

[0040] In this state, the spring receiving member 91 is arranged on the outer peripheral surface side of the cylinder 21. Also, in this state, the spring receiving member 91 has the cylindrical cylindrical portion 92 covering at least a part of the cylinder 21. Specifically, the cylindrical portion 92 covers a part on the small-diameter portion 42 side in the axial direction of the first large-diameter portion 41, which is a part of the first cylindrical portion 31, the small-diameter portion 42, and a part on the small-diameter portion 42 side in the axial direction of the second large-diameter portion 43. Also, in this state, as shown in FIG. 2, the spring receiving member 91 has the groove portion 111 provided in the cylindrical portion 92 communicating the outer peripheral surface side of the second large-diameter portion 43 of the cylinder 21 and the outer peripheral surface side of the small-diameter cylindrical portion 101 of the cylindrical portion 92.

[0041] As shown in FIG. 1, a suspension spring 125 that supports the vehicle body is seated on the surface of the end flange portion 123 of the spring receiving member 91 on the opening 24 side in the axial direction of the cylinder 21. Here, the spring receiving member 91 is attached to the vehicle body such that the position in the circumferential direction of the cylinder 21 is a specified position. Therefore, the spring receiving member 91 and the mounting eye 80 are attached to the vehicle with the relative position in the circumferential direction of the cylinder 21 in a specified state.

[0042] As shown in FIG. 2, the shock absorber 11 includes a band member 131 (second movement restricting portion). The band member 131 has a band-shaped portion 132 and a fixing portion 133. The band member 131 is an integrally molded product made of a single member formed in a belt shape from a synthetic resin material. The band member 131 is a binding band, so-called a tie wrap band. The band-shaped portion 132 has flexibility and is a long, thin plate-shaped band in one direction. The band-shaped portion 132 is particularly easy to bend in the thickness direction. Although not shown in the figure, serrations having a large number of teeth arranged in the length direction of the band-shaped portion 132 are formed on one side in the thickness direction of the band-shaped portion 132.

[0043] The fixing portion 133 is provided at one end in the length direction of the band-shaped portion 132. The fixing portion 133 is a square tubular shape into which the band-shaped portion 132 can be inserted from the inside. The band-shaped portion 132 is inserted into the fixing portion 133 from the other end in its length direction. As a result, the band member 131 becomes annular. At that time, in the radial direction, the other end of the band-shaped portion 132 is located outside the one end. Also, at that time, the band-shaped portion 132 is inserted into the fixing portion 133 such that the serrations (not shown) thereof face the inside in the radial direction of the band member 131. Although not shown in the figure, claw portions that engage with the serrations of the band-shaped portion 132 are formed inside the fixing portion 133. These claw portions allow movement of the band-shaped portion 132 in the insertion direction with respect to the fixing portion 133 and restrict movement of the band-shaped portion 132 in the removal direction with respect to the fixing portion 133.

[0044] As shown in FIG. 1, a spring receiving member 91 is brought into contact with an abutting ring 81 mounted in a fitting groove 45 of a cylinder 21 at an abutting portion 102 of a cylindrical portion 92. In this state, as shown in FIG. 2, a band member 131 is arranged such that a plurality of extending portions 116 and a plurality of groove portions 111 of the spring receiving member 91 overlap in the axial direction of a small-diameter cylindrical portion 101, and is wound around an outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101 of the plurality of extending portions 116. Then, the band member 131 has a strip-shaped portion 132 inserted into a fixing portion 133 up to a limit position in the insertion direction. Then, as shown in FIG. 3, the band member 131 is in a tightened state, and at least a part of an inner peripheral surface abuts against an outer peripheral surface of the cylindrical portion 92 and an outer peripheral surface of the cylinder 21, and is in a state of having a surface facing the cylindrical portion 92 and a surface facing the cylinder 21. Specifically, the band member 131 faces and abuts against and presses an outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101 of the plurality of extending portions 116 at a part of a serration (not shown) on the inner peripheral surface of the strip-shaped portion 132. At the same time, the band member 131 has the strip-shaped portion 132 enter into a plurality of groove portions 111 of the small-diameter cylindrical portion 101, and faces and abuts against and presses an outer peripheral surface of a second large-diameter portion 43 of the cylinder 21 at a part of a serration (not shown) on the inner peripheral surface thereof. The band member 131 abuts against and presses an outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101 of the plurality of extending portions 116 at a plurality of regions where the strip-shaped portion 132 is spaced in the length direction. At the same time, the band member 131 abuts against and presses an outer peripheral surface of the second large-diameter portion 43 at a plurality of regions where the strip-shaped portion 132 is spaced in the length direction.

[0045] As a result, due to the frictional force of the belt-like portion 132, the band member 131, the spring receiving member 91, and the cylinder 21 are fixed in a state. In other words, by the band member 131, the spring receiving member 91 is restricted from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also restricted from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 to suppress the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91. Note that the movement of the spring receiving member 91 toward the bottom portion 23 side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81.

[0046] In a shock absorber, during transportation before assembly to a vehicle or the like, relative displacement between the spring receiving member and the cylinder may occur. In such a case, before assembling to the vehicle, it is necessary to return the relative relationship between the spring receiving member and the cylinder to the original state, which is troublesome. For this reason, in a shock absorber, it is required to suppress the relative movement between the cylinder and the spring receiving member, particularly before assembling to the vehicle. In particular, in a single-tube shock absorber, since the spring receiving member is directly disposed on the outer peripheral surface of the cylinder where the piston slides on the inner peripheral surface, the spring receiving member cannot be fixed to the cylinder by welding and press-fitting that may deform the cylinder. Also, the diameter of the cylinder can be expanded in a range where the piston of the cylinder does not slide, and the spring receiving member can be press-fitted into this portion. However, in this case, the position where the spring receiving member can be press-fitted is limited. Also, the spring receiving member can be press-fitted into a range where the piston of the cylinder does not slide, but it affects the degree of freedom of the shape of the spring receiving member. For example, it is difficult when the spring is received near the center in the axial direction of the cylinder. Therefore, it is required to suppress the relative movement between the cylinder and the spring receiving member while suppressing the deformation of the cylinder, particularly before assembling to the vehicle.

[0047] Patent Document 1 described above discloses a shock absorber having a structure in which an annular groove is formed on the outer peripheral portion of a cylinder, a substantially C-shaped locking ring is fitted into this annular groove, and a spring seat is supported on the cylinder by this locking ring. In this shock absorber, a rubber member is provided between the outer peripheral surface of the locking ring and the inner peripheral surface of the spring seat to suppress relative movement between the locking ring and the spring seat, thereby suppressing relative movement between the spring seat and the cylinder. However, in the shock absorber of Patent Document 1, there is a possibility that relative movement between the spring seat and the cylinder cannot be sufficiently suppressed.

[0048] In contrast, in the shock absorber 11 of the first embodiment, the contact ring 81 provided on the first cylindrical portion 31 of the cylinder 21 and protruding radially outward contacts the spring receiving member 91, suppressing the axial movement of the spring receiving member 91 relative to the cylinder 21. Further, in the shock absorber 11, the band member 131 contacts the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 of the spring receiving member 91 that covers at least a part of the cylinder 21, suppressing the relative circumferential movement between the cylinder 21 and the spring receiving member 91. In this way, since the band member 131 of the shock absorber 11 contacts the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 of the spring receiving member 91, the frictional force can effectively suppress the relative circumferential movement between the cylinder 21 and the spring receiving member 91. Also, since the band member 131 of the shock absorber 11 contacts the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 of the spring receiving member 91, the frictional force can effectively suppress the relative axial movement between the cylinder 21 and the spring receiving member 91. That is, in addition to the axial movement of the spring receiving member 91 in the direction of the bottom portion 23 relative to the cylinder 21 restricted by the contact ring 81, the band member 131 suppresses the axial movement of the spring receiving member 91 in the direction opposite to the bottom portion 23 relative to the cylinder 21, which is not restricted by the contact ring 81. Therefore, the shock absorber 11 can effectively suppress the relative movement between the cylinder 21 and the spring receiving member 91. Of course, since the band member 131 only needs to contact the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 of the spring receiving member 91, the deformation occurring in the cylinder 21 can be suppressed. Also, the shock absorber 11 does not need to increase the diameter of the range where the piston 55 of the cylinder 21 does not slide, and has little influence on the shape of the spring receiving member 91. Therefore, the degree of freedom in the position and shape of the spring receiving member 91 is high. For example, the spring receiving member 91 can be arranged near the axial center of the cylinder 21.

[0049] Further, the shock absorber 11 includes a groove portion 111 provided in the cylindrical portion 92 of the spring receiving member 91 and communicating the outer peripheral surface side of the cylinder 21 and the outer peripheral surface side of the cylindrical portion 92. Therefore, the shock absorber 11 can easily bring the band member 131 into contact with the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the cylindrical portion 92.

[0050] Further, in the shock absorber 11, the groove portion 111 is formed such that at least a part of the axial length of the cylindrical portion 92 is shortened. Specifically, since the groove portion 111 is formed in a notch shape from the axial end surface of the cylindrical portion 92, a configuration for the band member 131 to pass through the cylindrical portion 92 in the radial direction can be easily formed.

[0051] In addition, since the shock absorber 11 uses the band member 131 formed in a string shape, the band member 131 can be easily attached so as to contact the outer peripheral surface of the cylinder 21 and the cylindrical portion 92 of the spring receiving member 91.

[0052] Moreover, since the shock absorber 11 uses the band member 131 formed of a resin material, the attachment of the band member 131 becomes even easier. Furthermore, the shock absorber 11 can suppress the increase in weight due to the band member 131 and can suppress the increase in component cost.

[0053] [Second Embodiment] Next, the second embodiment will be mainly described focusing on the differences from the first embodiment with reference to FIG. 4. For the parts common to the first embodiment, the same names and the same reference numerals are used.

[0054] As shown in FIG. 4, the shock absorber 11A of the second embodiment includes a spring receiving member 91A that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91A has a cylindrical portion 92A that is partially different from the cylindrical portion 92 in place of the cylindrical portion 92. The cylindrical portion 92A has a small-diameter cylindrical portion 101A that is partially different from the small-diameter cylindrical portion 101 in place of the small-diameter cylindrical portion 101.

[0055] The small-diameter cylindrical portion 101A is different from the small-diameter cylindrical portion 101 in that a through-hole 111A is formed instead of the groove portion 111. That is, the small-diameter cylindrical portion 101A has a through-hole 111A (communication portion) that penetrates the small-diameter cylindrical portion 101A in the radial direction at an intermediate portion in its axial direction. In other words, the through-hole 111A penetrates the small-diameter cylindrical portion 101A from its inner peripheral surface to its outer peripheral surface. A plurality of through-holes 111A having the same shape are formed at equal intervals in the circumferential direction of the small-diameter cylindrical portion 101A, specifically, at three locations.

[0056] The small-diameter cylindrical portion 101A has a base portion 115A, an extension portion 116A, and a tip portion 141A. The base portion 115A has substantially the same shape as the base portion 115, but is different in that its axial length is shorter. The extension portion 116A extends from this base portion 115A to the side opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101A. The tip portion 141A is provided on the side opposite to the base portion 115A of the extension portion 116A in the axial direction of the small-diameter cylindrical portion 101A, and connects a plurality of extension portions 116A. The tip portion 141A has a cylindrical shape over its entire axial length. A plurality of extension portions 116A having the same shape are formed at equal intervals in the circumferential direction of the small-diameter cylindrical portion 101A, specifically, at three locations.

[0057] Similar to the spring receiving member 91, the spring receiving member 91A fits into the second large-diameter portion 43 of the first cylindrical portion 31 in the small-diameter cylindrical portion 101A of the cylindrical portion 92A, and in the large-diameter cylindrical portion 103, fits into a contact ring 81 (see FIG. 1) attached to the cylinder 21, and contacts the end surface on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81 at the contact portion 102. In this state, the through-hole 111A provided in the cylindrical portion 92A allows the spring receiving member 91A to communicate the outer peripheral surface side of the second large-diameter portion 43 of the cylinder 21 and the outer peripheral surface side of the small-diameter cylindrical portion 101A of the cylindrical portion 92A.

[0058] As described above, the spring receiving member 91A is brought into contact with the contact ring 81 (see FIG. 1) attached to the cylinder 21 at the contact portion 102 of the cylindrical portion 92A. In this state, as shown in FIG. 4, the band member 131 is arranged such that the positions of the plurality of extending portions 116A and the plurality of through holes 111A of the spring receiving member 91A overlap in the axial direction of the small-diameter cylindrical portion 101A, and is wound around the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101A of the plurality of extending portions 116A. Then, the band member 131 is tightened. Then, at least a part of the inner peripheral surface of the band member 131 comes into contact with the outer peripheral surface of the cylindrical portion 92A and the outer peripheral surface of the cylinder 21, and it becomes a state having a surface facing the cylindrical portion 92A and a surface facing the cylinder 21. Specifically, the band member 131 faces and contacts and presses against the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101A of the plurality of extending portions 116A at a part of the serration (not shown) of the inner peripheral surface of its belt-like portion 132. At the same time, the band member 131 enters into the plurality of through holes 111A of the small-diameter cylindrical portion 101A with its belt-like portion 132, and at a part of the serration (not shown) of its inner peripheral surface, faces and contacts and presses against the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21. The band member 131 contacts and presses against the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101A of the plurality of extending portions 116A in a plurality of regions where the belt-like portion 132 is spaced in the length direction. At the same time, the band member 131 contacts and presses against the outer peripheral surface of the second large-diameter portion 43 in a plurality of regions where the belt-like portion 132 is spaced in the length direction.

[0059] As a result, due to the frictional force of the belt portion 132, the band member 131, the spring receiving member 91A, and the cylinder 21 are fixed. In other words, by the band member 131, the spring receiving member 91A is restricted from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also restricted from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92A of the spring receiving member 91A that covers at least a part of the cylinder 21, and suppresses the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91A. Note that the movement of the spring receiving member 91A toward the bottom portion 23 (see FIG. 1) side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81 (see FIG. 1).

[0060] In the shock absorber 11A of the second embodiment, the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92A of the spring receiving member 91A that covers at least a part of the cylinder 21, and suppresses the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91A. In this way, since the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92A of the spring receiving member 91A, the shock absorber 11A can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91A by the frictional force. Further, since the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92A of the spring receiving member 91A, the shock absorber 11A can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91A by the frictional force. That is, in addition to the axial movement of the spring receiving member 91A in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21, which is restricted by the contact ring 81 (see FIG. 1), the band member 131 suppresses the axial movement of the spring receiving member 91A in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, in the shock absorber 11A, the relative movement between the cylinder 21 and the spring receiving member 91A can be effectively suppressed. Of course, since it is only necessary for the band member 131 to abut against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92A of the spring receiving member 91A, the shock absorber 11A can suppress the deformation generated in the cylinder 21.

[0061] Further, the shock absorber 11A is provided in the cylindrical portion 92A of the spring receiving member 91A and includes a through hole 111A that communicates the outer peripheral surface side of the cylinder 21 and the outer peripheral surface side of the cylindrical portion 92A. Therefore, the shock absorber 11A can easily bring the band member 131 into contact with the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the cylindrical portion 92A.

[0062] Also, since the through hole 111A of the shock absorber 11A penetrates the cylindrical portion 92A in the radial direction, a configuration for allowing the band member 131 to pass through the cylindrical portion 92A in the radial direction can be easily formed.

[0063] [Third Embodiment] Next, the third embodiment will be mainly described focusing on the differences from the first embodiment with reference to FIG. 5. For the parts common to the first embodiment, the same names and the same reference numerals are used.

[0064] As shown in FIG. 5, the shock absorber 11B of the third embodiment includes a spring receiving member 91B that is partially different from the spring receiving member 91 instead of the spring receiving member 91. The spring receiving member 91B has a cylindrical portion 92B that is partially different from the cylindrical portion 92 instead of the cylindrical portion 92. The cylindrical portion 92B has a small-diameter cylindrical portion 101B that is partially different from the small-diameter cylindrical portion 101 instead of the small-diameter cylindrical portion 101.

[0065] The small-diameter cylindrical portion 101B is different from the small-diameter cylindrical portion 101 in that a notch portion 111B is formed instead of the groove portion 111. That is, the small-diameter cylindrical portion 101B has a notch portion 111B (communication portion) that is cut out at the tip portion on the side opposite to the contact portion 102 in the axial direction so that at least a part of the axial length of the small-diameter cylindrical portion 101B becomes shorter. Specifically, this notch portion 111B is a shape obtained by cutting the small-diameter cylindrical portion 101B with a plane that is not perpendicular to its central axis.

[0066] The small-diameter cylindrical portion 101B has a base portion 115B and an extension portion 116B. The base portion 115B is provided on the contact portion 102 side in the axial direction of the small-diameter cylindrical portion 101B and has a cylindrical shape over the entire axial length. The extension portion 116B protrudes from this base portion 115B in the direction opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101B. Only one extension portion 116B is formed in the small-diameter cylindrical portion 101B. The end face of the extension portion 116B on the side opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101B is in a planar shape that is not perpendicular to the central axis of the small-diameter cylindrical portion 101B.

[0067] The spring receiving member 91B, in the same manner as the spring receiving member 91, fits into the second large-diameter portion 43 of the first cylindrical portion 31 in the small-diameter cylindrical portion 101B of the cylindrical portion 92B, and in the large-diameter cylindrical portion 103, fits into the contact ring 81 (see FIG. 1) attached to the cylinder 21, and contacts the end face on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81 at the contact portion 102. In this state, the notch portion 111B provided in the cylindrical portion 92B allows the spring receiving member 91B to communicate between the outer peripheral surface side of the second large-diameter portion 43 of the cylinder 21 and the outer peripheral surface side of the small-diameter cylindrical portion 101B of the cylindrical portion 92B.

[0068] In this state, as shown in FIG. 5, the band member 131 is arranged such that one extension portion 116B and one notch portion 111B of the spring receiving member 91B overlap with the position of the small-diameter cylindrical portion 101B in the axial direction, and is wound around the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101B of one extension portion 116B. Then, the band member 131 is tightened. Then, at least a part of the inner peripheral surface of the band member 131 comes into contact with the outer peripheral surface of the cylindrical portion 92B and the outer peripheral surface of the cylinder 21, and it becomes a state having a surface facing the cylindrical portion 92B and a surface facing the cylinder 21. Specifically, the band member 131 faces and abuts against and presses the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101B of one extension portion 116B at a part of the serration (not shown) on the inner peripheral surface of its belt-like portion 132. At the same time, the belt-like portion 132 of the band member 131 enters the space formed by the notch portion 111B of the small-diameter cylindrical portion 101B, and at a part of the serration (not shown) on the inner peripheral surface thereof, it faces and abuts against and presses the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21.

[0069] As a result, due to the frictional force of the belt-like portion 132, the band member 131, the spring receiving member 91B, and the cylinder 21 are fixed. In other words, by the band member 131, the spring receiving member 91B is suppressed from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also suppressed from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the band member 131 abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92B to suppress the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91B. Note that the movement of the spring receiving member 91B toward the bottom portion 23 (see FIG. 1) side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81 (see FIG. 1).

[0070] In the shock absorber 11B of the third embodiment, the band member 131 abuts on the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92B of the spring receiving member 91B that covers at least a part of the cylinder 21, suppressing the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91B. Since the band member 131 abuts on the outer peripheral surface of the cylinder 21 and the tube portion 92B of the spring receiving member 91B in this way, the shock absorber 11B can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91B due to the frictional force. Further, since the band member 131 abuts on the outer peripheral surface of the cylinder 21 and the tube portion 92B of the spring receiving member 91B, the shock absorber 11B can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91B due to the frictional force. That is, in addition to the axial movement of the spring receiving member 91B in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 restricted by the contact ring 81 (see FIG. 1), the band member 131 suppresses the axial movement of the spring receiving member 91B in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, the shock absorber 11B can effectively suppress the relative movement between the cylinder 21 and the spring receiving member 91B. Of course, since it is only necessary for the band member 131 to abut on the outer peripheral surface of the cylinder 21 and the tube portion 92B of the spring receiving member 91B, the shock absorber 11B can suppress the deformation occurring in the cylinder 21.

[0071] Further, the shock absorber 11B includes a notch portion 111B provided in the tube portion 92B of the spring receiving member 91B and communicating the outer peripheral surface side of the cylinder 21 and the outer peripheral surface side of the tube portion 92B. For this reason, the shock absorber 11B can easily bring the band member 131 into contact with the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the tube portion 92B.

[0072] Further, since the notch portion 111B is formed such that at least a part of the axial length of the tube portion 92B is shortened in the shock absorber 11B, a configuration for allowing the band member 131 to pass through the tube portion 92B in the radial direction can be easily formed.

[0073] [Fourth Embodiment] Next, the fourth embodiment will be mainly described with reference to FIG. 6, focusing on the differences from the first embodiment. For parts common to the first embodiment, the same names and the same reference numerals are used.

[0074] As shown in FIG. 6, the shock absorber 11C of the fourth embodiment includes a spring receiving member 91C that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91C has a cylinder portion 92C that is partially different from the cylinder portion 92 in place of the cylinder portion 92. The cylinder portion 92C has a small-diameter cylinder portion 101C that is partially different from the small-diameter cylinder portion 101 in place of the small-diameter cylinder portion 101. The difference between the small-diameter cylinder portion 101C and the small-diameter cylinder portion 101 is that the small-diameter cylinder portion 101C has an extension portion 116C that is partially different from the extension portion 116 in place of the extension portion 116.

[0075] A plurality of, specifically three, extension portions 116C of the same shape each have an engagement groove 151C that is recessed inward in the radial direction of the small-diameter cylinder portion 101C formed on the outer outer surface in the radial direction of the small-diameter cylinder portion 101C. The extension portion 116C is different from the extension portion 116 in this regard. The plurality of engagement grooves 151C penetrate the extension portion 116C provided for each in the circumferential direction of the small-diameter cylinder portion 101C. All the engagement grooves 151C of the small-diameter cylinder portion 101C are arranged on the same circle. All the engagement grooves 151C of the small-diameter cylinder portion 101C have the groove bottom surfaces on the concave side in the same cylindrical surface.

[0076] The shock absorber 11C includes a ring member 131C (second movement suppression portion) that is different from the band member 131 in place of the band member 131. The ring member 131C is formed in an endless, that is, annular shape. The ring member 131C is an integrally molded product made of an elastic deformable rubber material. Specifically, the ring member 131C is a square ring.

[0077] The spring receiving member 91C, in the same manner as the spring receiving member 91, fits into the second large-diameter portion 43 of the first cylindrical portion 31 in the small-diameter cylindrical portion 101C of the cylindrical portion 92C, and in the large-diameter cylindrical portion 103, fits into the contact ring 81 (see FIG. 1) attached to the cylinder 21, and in the contact portion 102, contacts the end surface on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81.

[0078] In this state, the ring member 131C is in a state of being overall extended and expanded in the circumferential direction. As shown in FIG. 6, all the engaging grooves 151C and the plurality of groove portions 111 of the plurality of extending portions 116C of the spring receiving member 91C are arranged so that the positions in the axial direction of the small-diameter cylindrical portion 101C overlap, and face the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101C of the plurality of extending portions 116C. Then, the diameter expansion of the ring member 131C is released. Then, the ring member 131C enters and engages with the plurality of engaging grooves 151C by reducing its diameter, and at least a part of its inner peripheral surface contacts the groove bottom surface of the engaging groove 151C, which is a part of the outer peripheral surface of the cylindrical portion 92C, and the outer peripheral surface of the cylinder 21, and becomes a state having a surface facing the cylindrical portion 92C and a surface facing the cylinder 21. Specifically, the ring member 131C faces and contacts and presses against the groove bottom surfaces of the plurality of engaging grooves 151C, which are the outer surfaces on the outer side in the radial direction of the small-diameter cylindrical portion 101C of the plurality of extending portions 116C, at a part of its inner peripheral surface. At the same time, the ring member 131C enters into the plurality of groove portions 111, and at a part of its inner peripheral surface, faces the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21, and contacts and presses against this outer peripheral surface. The ring member 131C contacts and presses against the groove bottom surfaces of the plurality of engaging grooves 151C at a plurality of regions spaced apart in the circumferential direction. At the same time, the ring member 131C contacts and presses against the outer peripheral surface of the second large-diameter portion 43 at a plurality of regions spaced apart in the circumferential direction.

[0079] As a result, due to the frictional force of the ring member 131C, the ring member 131C, the spring receiving member 91C, and the cylinder 21 are fixed. In other words, by the ring member 131C, the spring receiving member 91C is restricted from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also restricted from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the ring member 131C abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92C of the spring receiving member 91C that covers at least a part of the cylinder 21, and suppresses the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91C. Note that the movement of the spring receiving member 91C toward the bottom portion 23 (see FIG. 1) side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81 (see FIG. 1).

[0080] In the shock absorber 11C of the fourth embodiment, the ring member 131C abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92C of the spring receiving member 91C that covers at least a part of the cylinder 21, and suppresses the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91C. In this way, since the ring member 131C abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92C of the spring receiving member 91C, the shock absorber 11C can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91C by the frictional force. Further, since the ring member 131C abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92C of the spring receiving member 91C, the shock absorber 11C can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91C by the frictional force. That is, in addition to the axial movement of the spring receiving member 91C in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 restricted by the contact ring 81 (see FIG. 1), the ring member 131C suppresses the axial movement of the spring receiving member 91C in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, in the shock absorber 11C, the relative movement between the cylinder 21 and the spring receiving member 91C can be effectively suppressed. Of course, since it is only necessary for the ring member 131C to abut against the outer peripheral surface of the cylinder 21 and the tube portion 92C of the spring receiving member 91C, the shock absorber 11C can suppress the deformation occurring in the cylinder 21.

[0081] Further, since the buffer 11C uses a ring member 131C formed in a ring shape by a rubber material, the ring member 131C can be easily attached so as to contact the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92C of the spring receiving member 91C. Moreover, the buffer 11C can suppress the increase in weight due to the ring member 131C, and can suppress the increase in component cost.

[0082] [Fifth Embodiment] Next, the fifth embodiment will be mainly described focusing on the differences from the first embodiment based on FIGS. 7 and 8. For parts common to the first embodiment, the same names and the same reference numerals are used.

[0083] As shown in FIG. 7, the buffer 11D of the fifth embodiment includes a spring receiving member 91D that is partially different from the spring receiving member 91 instead of the spring receiving member 91. The spring receiving member 91D has a tube portion 92D that is partially different from the tube portion 92 instead of the tube portion 92. The tube portion 92D has a small-diameter tube portion 101D that is partially different from the small-diameter tube portion 101 instead of the small-diameter tube portion 101. The small-diameter tube portion 101D is different from the small-diameter tube portion 101 in that it has a groove portion 111D (communication portion) that is partially different from the groove portion 111 instead of the groove portion 111.

[0084] The tube portion 92D has a plurality of, specifically, three protruding portions 161D having the same shape. The protruding portions 161D protrude outward in the radial direction from the small-diameter tube portion 101D. A plurality of, specifically, three groove portions 111D having the same shape have a groove bottom surface (axial end surface) on the contact portion 102 side in the axial direction of the small-diameter tube portion 101D that is the surface opposite to the contact portion 102 of the protruding portion 161D in the axial direction of the small-diameter tube portion 101D. In other words, a protruding portion 161D that protrudes radially outward is formed on the groove bottom surface of the groove portion 111D. Other than this, the groove portion 111D has substantially the same shape as the groove portion 111.

[0085] Here, in the state before completion, the small-diameter cylindrical portion 101D forms a cylindrical shape over its entire length. At the tip of the small-diameter cylindrical portion 101D in this state, cuts are made to form both side surfaces of the groove portion 111D, and the portion between the two side surfaces is tilted outward in the radial direction of the small-diameter cylindrical portion 101D to form the protruding portion 161D and the groove portion 111D. The plurality of protruding portions 161D are arranged on the same plane, and then appropriately processed so that the tip surfaces on the protruding side are arranged on the same cylindrical surface. Therefore, the spring receiving member 91D is an integrally formed product made of a single member including all the protruding portions 161D.

[0086] Similar to the shock absorber 11, in the shock absorber 11D of the fifth embodiment, the spring receiving member 91 and the cylinder 21 are fixed by the band member 131. At that time, the band portion 132 of the band member 131 enters into the plurality of groove portions 111D of the small-diameter cylindrical portion 101D and abuts against and presses the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21.

[0087] After that, the shock absorber 11D is to be assembled to the vehicle side. At that time, as shown in FIG. 8, on the outer side in the radial direction of the shock absorber 11D, a dust cover 165D is provided that covers at least a part of the cylinder 21 or at least a part of the cylindrical portion 92D on the outer side in their radial directions. Specifically, the dust cover 165D covers the range from the end on the intermediate locking portion 32 side to the intermediate predetermined position in the axial direction of the second large-diameter portion 43 of the first cylindrical portion 31 of the cylinder 21, the intermediate locking portion 32, the second cylindrical portion 33, and the end locking portion 34. Also, the dust cover 165D covers the range from the end on the side opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101D of the spring receiving member 91D to the predetermined position on the contact portion 102 side from the protruding portion 161D. Therefore, the dust cover 165D also covers the band member 131 on the outer side in its radial direction. In other words, the band member 131 is arranged within the axial range on the inner side in the radial direction of the dust cover 165D. The dust cover 165D is arranged between the suspension spring 125 and the shock absorber 11D in the radial direction.

[0088] The dust cover 165D is formed of a synthetic resin into a bellows shape and expands and contracts in its axial direction. At one end in the axial direction of the dust cover 165D, an engaging recess 166D that is recessed from the inside to the outside in the radial direction is formed. The engaging recess 166D is annular. As described above, the dust cover 165D covers at least a part of the cylinder 21 and at least a part of the cylinder portion 92D, and the engaging recess 166D located at the end on the spring receiving member 91D side in the axial direction engages with the plurality of protruding portions 161D of the spring receiving member 91D. Thereby, axial movement and radial movement of the engaging recess 166D, which is at least a part of the dust cover 165D, with respect to the spring receiving member 91D and the cylinder 21 are suppressed. When this dust cover 165D is assembled to the vehicle together with the shock absorber 11D and the suspension spring 125, axial movement and radial movement of the engaging recess 166D with respect to the spring receiving member 91D and the cylinder 21 are restricted by the protruding portions 161D.

[0089] The shock absorber 11D of the fifth embodiment has the same effect as the shock absorber 11. In addition, in the shock absorber 11D, axial movement of at least a part of the dust cover 165D that covers at least a part of the cylinder 21 or at least a part of the cylinder portion 92D with respect to the cylinder 21 is suppressed by the protruding portions 161D of the spring receiving member 91D. Therefore, the shock absorber 11D does not require a dedicated component for suppressing axial movement of at least a part of the dust cover 165D with respect to the cylinder 21. Therefore, the shock absorber 11D can reduce the number of parts and costs.

[0090] [Sixth Embodiment] Next, the sixth embodiment will be mainly described focusing on the differences from the first embodiment based on FIGS. 9 and 10. For parts common to the first embodiment, the same names and the same reference numerals are used.

[0091] As shown in Fig. 9, the shock absorber 11E of the sixth embodiment includes a spring receiving member 91E that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91E has a cylinder portion 92E that is partially different from the cylinder portion 92 in place of the cylinder portion 92. The cylinder portion 92E has a small-diameter cylinder portion 101E that is partially different from the small-diameter cylinder portion 101 in place of the small-diameter cylinder portion 101. As shown in Fig. 10, the small-diameter cylinder portion 101E has a groove portion 111E (communication portion) that is substantially the same shape as the groove portion 111 and has a greater depth in the axial direction of the small-diameter cylinder portion 101E than the groove portion 111 in place of the groove portion 111. As a result, the small-diameter cylinder portion 101E has a base portion 115E that is substantially the same shape as the base portion 115 and has a shorter axial length than the base portion 115 in place of the base portion 115. Further, the small-diameter cylinder portion 101E has a plurality of extension portions 116E that are substantially the same shape as the extension portions 116 and have a greater length in the axial direction of the small-diameter cylinder portion 101E than the extension portions 116 in place of the plurality of extension portions 116.

[0092] As shown in Fig. 9, the shock absorber 11E includes a ring member 131E (second movement restricting portion) that is different from the band member 131 in place of the band member 131. The ring member 131E is formed in an endless, i.e., annular shape. The ring member 131E is an integrally molded product made of a single member formed of an elastically deformable rubber material. An accommodation groove 171E that is recessed radially inward from the outer peripheral surface is formed in the intermediate portion in the axial direction of the ring member 131E. The accommodation groove 171E is annular. As a result, one side of the ring member 131E in its axial direction with respect to the accommodation groove 171E is an engagement flange portion 172E that protrudes radially outward from the groove bottom surface of the accommodation groove 171E, and the other side of the ring member 131E in its axial direction with respect to the accommodation groove 171E is a flange portion 173E that protrudes radially outward from the groove bottom surface of the accommodation groove 171E. Both the engagement flange portion 172E and the flange portion 173E are annular. The outer peripheral portion of the end portion of the engagement flange portion 172E on the side opposite to the flange portion 173E in its axial direction is chamfered. The engagement flange portion 172E and the accommodation groove 171E form a stepped portion 175E in which a part of the outer peripheral surface of the ring member 131E has a step.

[0093] As shown in FIG. 10, similar to the spring receiving member 91, the spring receiving member 91E fits into the second large diameter portion 43 of the first cylindrical portion 31 in the small diameter cylindrical portion 101E of the cylindrical portion 92E, and in the large diameter cylindrical portion 103, it fits into the contact ring 81 attached to the cylinder 21, and in the contact portion 102, it contacts the end surface on the opening 24 side in the axial direction of the contact ring 81.

[0094] In this state, the ring member 131E is in a state where its diameter is expanded as a whole, and as shown in FIG. 9, it is arranged so that the positions of the plurality of extending portions 116E and the plurality of groove portions 111E of the spring receiving member 91E in the axial direction overlap with the small diameter cylindrical portion 101E, and faces the outer surface on the outer side in the radial direction of the small diameter cylindrical portion 101E of the plurality of extending portions 116E. At this time, the ring member 131E is oriented such that the flange portion 173E is located closer to the contact portion 102 side than the engagement flange portion 172E in the axial direction of the small diameter cylindrical portion 101E. Then, the diameter expansion of the ring member 131E is released. Then, the ring member 131E will contract in diameter, and at least a part of its inner peripheral surface contacts the outer peripheral surface of the cylindrical portion 92E and the outer peripheral surface of the cylinder 21, and it becomes a state having a surface facing the cylindrical portion 92E and a surface facing the cylinder 21. Specifically, in a part of its inner peripheral surface, the ring member 131E faces and contacts and presses against the outer surface on the outer side in the radial direction of the small diameter cylindrical portion 101E of the plurality of extending portions 116E. At the same time, the ring member 131E enters into the plurality of groove portions 111E, and in a part of its inner peripheral surface, it faces and contacts and presses against the outer peripheral surface of the second large diameter portion 43 of the cylinder 21. The ring member 131E contacts and presses against the outer surface on the outer side in the radial direction of the small diameter cylindrical portion 101E of the plurality of extending portions 116E in a plurality of regions spaced apart in the circumferential direction. At the same time, the ring member 131E contacts and presses against the outer peripheral surface of the second large diameter portion 43 in a plurality of regions spaced apart in the circumferential direction.

[0095] As a result, due to the frictional force of the ring member 131E, the ring member 131E, the spring receiving member 91E, and the cylinder 21 are fixed. In other words, by the ring member 131E, the spring receiving member 91E is suppressed from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21 and is also suppressed from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the ring member 131E abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92E to suppress the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91E.

[0096] After that, the shock absorber 11E will be assembled to the vehicle side. At that time, as shown in FIG. 10, on the radially outer side of the shock absorber 11E, a dust cover 165E is provided that covers at least a part of the cylinder 21 or at least a part of the cylindrical portion 92E on the radially outer side thereof. Specifically, the dust cover 165E covers the range from the end on the intermediate locking portion 32 side to the intermediate predetermined position in the axial direction of the second large-diameter portion 43 of the first cylindrical portion 31 of the cylinder 21, the intermediate locking portion 32, the second cylindrical portion 33, and the end locking portion 34. Further, the dust cover 165E covers the range from the end on the side opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101E of the spring receiving member 91E to a predetermined position on this end side from the groove bottom surface of the groove portion 111E. The dust cover 165E is disposed between the suspension spring 125 and the shock absorber 11E in the radial direction.

[0097] The dust cover 165E is formed of a synthetic resin into a bellows cylindrical shape and expands and contracts in the axial direction. At one end in the axial direction of the dust cover 165E, an engaging concave portion 166E that is recessed from the inside to the outside in the radial direction is formed. The engaging concave portion 166E is annular. As described above, the dust cover 165E covers at least a part of the cylinder 21 and at least a part of the cylindrical portion 92E, and the engaging recess 166E located at the end on the spring receiving member 91E side in the axial direction engages with the engaging flange portion 172E of the stepped portion 175E of the ring member 131E. As a result, the engaging recess 166E, which is at least a part of the dust cover 165E, is restricted by the engaging flange portion 172E from moving axially and radially with respect to the spring receiving member 91E and the cylinder 21.

[0098] In the shock absorber 11E of the sixth embodiment, the ring member 131E abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92E of the spring receiving member 91E that covers at least a part of the cylinder 21, suppressing the relative circumferential movement between the cylinder 21 and the spring receiving member 91E. In this way, since the ring member 131E abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92E of the spring receiving member 91E, the shock absorber 11E can effectively suppress the relative circumferential movement between the cylinder 21 and the spring receiving member 91E due to the frictional force. Further, since the ring member 131E abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92E of the spring receiving member 91E, the shock absorber 11E can also effectively suppress the relative axial movement between the cylinder 21 and the spring receiving member 91E due to the frictional force. That is, in addition to the axial movement of the spring receiving member 91E in the direction of the bottom portion 23 with respect to the cylinder 21 restricted by the contact ring 81, the ring member 131E suppresses the axial movement of the spring receiving member 91E in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, the shock absorber 11E can effectively suppress the relative movement between the cylinder 21 and the spring receiving member 91E. Of course, since the ring member 131E only needs to abut against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92E of the spring receiving member 91E, the shock absorber 11E can suppress the deformation occurring in the cylinder 21.

[0099] In addition, since the shock absorber 11E uses a ring member 131E formed in a ring shape from a rubber material, the ring member 131E can be easily attached so as to contact the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92E of the spring receiving member 91E. Moreover, the shock absorber 11E can suppress an increase in weight due to the ring member 131E, and can suppress an increase in component cost.

[0100] In addition, at least a part of the dust cover 165E that covers at least a part of the cylinder 21 or at least a part of the tube portion 92E is axially moved relative to the cylinder 21 by the step portion 175E of the ring member 131E in the shock absorber 11E. Therefore, the shock absorber 11E does not require a dedicated component for suppressing the axial movement of at least a part of the dust cover 165E relative to the cylinder 21. Therefore, the shock absorber 11E can reduce the number of components and cost.

[0101] [Seventh Embodiment] Next, the seventh embodiment will be mainly described focusing on the differences from the first embodiment based on FIGS. 11 to 13. Note that parts common to the first embodiment are denoted by the same reference numerals and the same names.

[0102] As shown in FIG. 11, the shock absorber 11F of the seventh embodiment includes a cylinder 21F that is partially different from the cylinder 21 instead of the cylinder 21. The cylinder 21F has a barrel portion 22F that is partially different from the barrel portion 22 instead of the barrel portion 22. The barrel portion 22F has a first cylindrical portion 31F (cylindrical portion) that is partially different from the first cylindrical portion 31 instead of the first cylindrical portion 31. The first cylindrical portion 31F has a second large diameter portion 43F that is partially different from the second large diameter portion 43, a third large diameter portion 181F that is partially different from the second large diameter portion 43, and a second small diameter portion 182F instead of the second large diameter portion 43.

[0103] The first cylindrical portion 31F has a cylindrical shape over the entire axial length thereof, and in the axial direction thereof, has a first large diameter portion 41, a small diameter portion 42, a second large diameter portion 43F, a second small diameter portion 182F, and a third large diameter portion 181F in order from the bottom portion 23 side.

[0104] The second large-diameter portion 43F has substantially the same shape as the second large-diameter portion 43 and has a shorter axial length than the second large-diameter portion 43. The third large-diameter portion 181F also has substantially the same shape as the second large-diameter portion 43 and has a shorter axial length than the second large-diameter portion 43. The second small-diameter portion 182F has a cylindrical outer peripheral surface on its radially outer side, and an inner peripheral surface on its radially inner side is a cylindrical surface coaxial with this outer peripheral surface. The inner diameter of the second small-diameter portion 182F is equal to the inner diameters of the first large-diameter portion 41, the small-diameter portion 42, the second large-diameter portion 43F, and the third large-diameter portion 181F, and its outer diameter is smaller than the outer diameters of the first large-diameter portion 41, the second large-diameter portion 43F, and the third large-diameter portion 181F. The first large-diameter portion 41, the small-diameter portion 42, the second large-diameter portion 43F, the second small-diameter portion 182F, and the third large-diameter portion 181F have a common central axis.

[0105] Therefore, the first cylindrical portion 31F is between the first large-diameter portion 41 and the second large-diameter portion 43F in its axial direction, and the outer diameter side of the small-diameter portion 42 forms a fitting groove 45. The fitting groove 45 is recessed inward in the radial direction from the outer peripheral surface of the first large-diameter portion 41 and the outer peripheral surface of the second large-diameter portion 43F. The fitting groove 45 is annular. Also, the first cylindrical portion 31F is between the second large-diameter portion 43F and the third large-diameter portion 181F in its axial direction, and the outer diameter side of the second small-diameter portion 182F forms a second fitting groove 185F. The second fitting groove 185F is recessed inward in the radial direction from the outer peripheral surface of the second large-diameter portion 43F and the outer peripheral surface of the third large-diameter portion 181F. The second fitting groove 185F is annular.

[0106] The shock absorber 11F is provided with a spring receiving member 91F that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91F has a cylindrical portion 92F that is partially different from the cylindrical portion 92 in place of the cylindrical portion 92. The cylindrical portion 92F has a small-diameter cylindrical portion 101F that is partially different from the small-diameter cylindrical portion 101 in place of the small-diameter cylindrical portion 101.

[0107] As shown in Fig. 12, the small-diameter cylindrical portion 101F is different from the small-diameter cylindrical portion 101 in that it has an axially protruding portion 116F instead of a plurality of extending portions 116. The axially protruding portion 116F protrudes from the base portion 115 along the axial direction of the small-diameter cylindrical portion 101F in the direction opposite to the contact portion 102. Only one axially protruding portion 116F is formed on the small-diameter cylindrical portion 101F.

[0108] The shock absorber 11F includes a ring member 131F (second movement suppression portion). The ring member 131F is made of metal and has a main body portion 192F and a pair of protruding portions 193F. The main body portion 192F has a C shape formed by dividing a part of the ring in the circumferential direction. The outer peripheral surface on the radially outer side of the main body portion 192F is in the shape of a cylindrical surface, and the inner peripheral surface on the radially inner side thereof is in the shape of a cylindrical surface coaxial with this outer peripheral surface. The pair of protruding portions 193F protrude outward in the radial direction of the main body portion 192F from both ends on the dividing side in the circumferential direction of the main body portion 192F. The ring member 131F has a thickness in the axial direction of the main body portion 192F smaller than the width in the radial direction of the main body portion 192F. Engagement holes 195F penetrating along the axial direction of the main body portion 192F are respectively formed in the pair of protruding portions 193F. The ring member 131F is a snap ring.

[0109] Similar to the spring receiving member 91, as shown in Fig. 11, the spring receiving member 91F fits into the second large-diameter portion 43F of the first cylindrical portion 31F in the small-diameter cylindrical portion 101F of the cylindrical portion 92F, and in the large-diameter cylindrical portion 103, it fits into the contact ring 81 attached to the cylinder 21F, and contacts the end face on the opening 24 side in the axial direction of the contact ring 81 at the contact portion 102. In this state, the second fitting groove 185F is flush with the end face on the side opposite to the axial contact portion 102 of the base portion 115 of the spring receiving member 91F, where the side surface on the bottom portion 23 side in the axial direction of the cylinder 21F is located. In this state, the ring member 131F is fitted into the second fitting groove 185F of the cylinder 21F. At this time, as shown in FIGS. 12 and 13, the axial protruding portion 116F of the spring receiving member 91F is disposed between the pair of protruding portions 193F in the circumferential direction of the ring member 131F.

[0110] The inner diameter of the ring member 131F before being fitted into the second fitting groove 185F shown in FIG. 11 is slightly smaller than the outer diameter of the second small diameter portion 182F of the cylinder 21F, in other words, the groove bottom diameter of the second fitting groove 185F. Therefore, the ring member 131F abuts against and is pressed against the groove bottom surface on the inner side in the recessed direction of the second fitting groove 185F. Therefore, when the ring member 131F is fitted into the second fitting groove 185F, its frictional force suppresses the movement of the ring member 131F to both sides in the circumferential direction with respect to the cylinder 21F. When the ring member 131F is fitted into the second fitting groove 185F, the outer diameter of its main body portion 192F is larger than the outer diameters of the second large diameter portion 43F and the third large diameter portion 181F. Therefore, the ring member 131F is provided on the first cylindrical portion 31F of the cylinder 21F and protrudes radially outward from the first cylindrical portion 31F of the cylinder 21F.

[0111] When the ring member 131F is fitted into the second fitting groove 185F, the movement of the ring member 131F toward the bottom portion 23 side in the axial direction of the cylinder 21F is restricted by abutting against the end face on the second small diameter portion 182F side in the axial direction of the second large diameter portion 43F. Further, when the ring member 131F is fitted into the second fitting groove 185F, the movement of the ring member 131F toward the side opposite to the bottom portion 23 in the axial direction of the cylinder 21F is restricted by abutting against the end face on the second small diameter portion 182F side in the axial direction of the third large diameter portion 181F. Therefore, when the ring member 131F is fitted into the second fitting groove 185F, the movement of the ring member 131F to both sides in the axial direction of the cylinder 21F is suppressed. In addition to these, as described above, the relative movement of the ring member 131F to both sides in the circumferential direction of the cylinder 21F is suppressed by its frictional force, and as a result, the ring member 131F is fixed to the cylinder 21F.

[0112] With the ring member 131F fitted into the second fitting groove 185F, it abuts against the end face on the opposite side of the contact portion 102 in the axial direction of the base portion 115 of the spring receiving member 91F, restricting the movement of the spring receiving member 91F to the side opposite to the bottom portion 23 in the axial direction of the cylinder 21F. Also, in this state, as shown in FIGS. 12 and 13, the main body portion 192F of the ring member 131F abuts against at least one of both ends in the circumferential direction of the base portion 115 of the axially projecting portion 116F of the spring receiving member 91F at the circumferentially divided end, and is arranged to support the axially projecting portion 116F. Thereby, the ring member 131F suppresses the relative movement in the circumferential direction between the spring receiving member 91F and the cylinder 21F. Specifically, the main body portion 192F of the ring member 131F abuts against the end faces on both sides in the circumferential direction of the base portion 115 of the axially projecting portion 116F of the spring receiving member 91F at both end faces on the circumferentially divided side, suppressing the relative movement on both sides in the circumferential direction between the spring receiving member 91F and the cylinder 21F.

[0113] Thereby, due to the frictional force of the ring member 131F, the spring receiving member 91F is restricted from moving to both sides in the circumferential direction of the cylinder 21F with respect to the cylinder 21F. At the same time, the spring receiving member 91F is restricted from moving to the side opposite to the bottom portion 23 in the axial direction of the cylinder 21F with respect to the cylinder 21F by the ring member 131F. In other words, the ring member 131F abuts against the groove bottom surface of the second fitting groove 185F constituting the outer peripheral surface of the cylinder 21F and the axially projecting portion 116F of the cylindrical portion 92F, suppressing the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21F and the spring receiving member 91F. Note that the movement of the spring receiving member 91F to the bottom portion 23 side in the axial direction of the cylinder 21F with respect to the cylinder 21F is restricted by the contact ring 81 in the same manner as above.

[0114] In the shock absorber 11F of the seventh embodiment, the ring member 131F abuts against the outer peripheral surface of the cylinder 21F and the cylindrical tube portion 92F of the spring receiving member 91F that covers at least a part of the cylinder 21F, suppressing the relative movement in the circumferential direction between the cylinder 21F and the spring receiving member 91F. In this way, since the ring member 131F of the shock absorber 11F abuts against the outer peripheral surface of the cylinder 21F and the tube portion 92F of the spring receiving member 91F, the frictional force can effectively suppress the relative movement in the circumferential direction between the cylinder 21F and the spring receiving member 91F. Further, in the shock absorber 11F, since the ring member 131F abuts against the outer peripheral surface of the cylinder 21F and the axial protrusion 116F of the tube portion 92F of the spring receiving member 91F, the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91F can also be effectively suppressed. That is, in addition to the axial movement of the spring receiving member 91F in the direction of the bottom portion 23 with respect to the cylinder 21F restricted by the contact ring 81, the ring member 131F restricts the axial movement of the spring receiving member 91F in the direction opposite to the bottom portion 23 with respect to the cylinder 21F, which is not restricted by the contact ring 81. Therefore, in the shock absorber 11F, the relative movement between the cylinder 21F and the spring receiving member 91F can be effectively suppressed. Of course, since the ring member 131F of the shock absorber 11F only needs to abut against the outer peripheral surface of the cylinder 21F and the tube portion 92F of the spring receiving member 91F, the deformation occurring in the cylinder 21F can be suppressed.

[0115] Further, the shock absorber 11F has an axial protrusion 116F that protrudes in the axial direction, the ring member 131F is fixed to the cylinder 21F, and is arranged to abut against and support at least one of the circumferential ends of the axial protrusion 116F. For this reason, the shock absorber 11F can easily suppress the relative movement between the cylinder 21F and the spring receiving member 91F with the ring member 131F.

[0116] [Eighth Embodiment] Next, the eighth embodiment will be mainly described based on FIG. 14, focusing on the differences from the first embodiment. For parts common to the first embodiment, the same names and the same reference numerals are used.

[0117] As shown in FIG. 14, the shock absorber 11G of the eighth embodiment includes a spring receiving member 91G that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91G has a cylinder portion 92G that is partially different from the cylinder portion 92 in place of the cylinder portion 92. The cylinder portion 92G has a small-diameter cylinder portion 101G that is partially different from the small-diameter cylinder portion 101 in place of the small-diameter cylinder portion 101. The small-diameter cylinder portion 101G is the same as the base portion 115 of the small-diameter cylinder portion 101. Therefore, the small-diameter cylinder portion 101G has a cylindrical shape over the entire length in its axial direction.

[0118] The shock absorber 11G includes a contact ring 81G (first movement restricting portion) that is partially different from the contact ring 81 (see FIG. 1) in place of the contact ring 81. The contact ring 81G is made of metal and is a C-shaped C-ring formed by dividing a portion of an annular ring in the circumferential direction. On the outer peripheral surface on the outer side in the radial direction of the contact ring 81G, an outer serration portion 202G (second movement restricting portion) having a large number of teeth 201G arranged in the circumferential direction is formed. Also, although not shown in the figure, an inner serration portion (second movement restricting portion) having a large number of teeth arranged in the circumferential direction is also formed on the inner peripheral surface on the inner side in the radial direction of the contact ring 81G. The contact ring 81G is fitted into a fitting groove 45 provided in the first cylinder portion 31 of the cylinder 21. Thereby, the inner serration portion of the contact ring 81G abuts against and presses against the groove bottom surface of the fitting groove 45.

[0119] In a state where the contact ring 81G is fitted into the fitting groove 45, like the contact ring 81, the contact ring 81G protrudes outward in the radial direction from the first cylinder portion 31 of the cylinder 21, and the movement of the contact ring 81G in both axial directions of the cylinder 21 is restricted by the first cylinder portion 31.

[0120] The spring receiving member 91G fits into the second large diameter portion 43 of the first cylindrical portion 31 in the small diameter cylindrical portion 101G of the cylindrical portion 92G and into the contact ring 81G in the large diameter cylindrical portion 103 in the same manner as the spring receiving member 91. The spring receiving member 91G abuts against the end surface on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81G at the contact portion 102. At that time, the large diameter cylindrical portion 103 fits into the contact ring 81G with a slight tightening allowance. As a result, the outer serration portion 202G abuts against and is pressed against the inner side in the radial direction of the cylindrical portion 92G, and a non-illustrated inner serration portion abuts against and is pressed against the outer side in the radial direction of the cylinder 21.

[0121] In the shock absorber 11G of the eighth embodiment, the contact ring 81G abuts against the groove bottom surface of the fitting groove 45 which is the outer peripheral surface of the cylinder 21 and the inner peripheral surface of the large diameter cylindrical portion 103 of the cylindrical portion 92G of the spring receiving member 91G that covers at least a part of the cylinder 21, thereby suppressing the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91G. In this way, since the contact ring 81G abuts against the outer peripheral surface of the cylinder 21 and the inner peripheral surface of the cylindrical portion 92G of the spring receiving member 91G, the shock absorber 11G can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91G by the frictional force. Since the contact ring 81G abuts against the outer peripheral surface of the cylinder 21 and the inner peripheral surface of the cylindrical portion 92G of the spring receiving member 91G, the shock absorber 11G can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91G by the frictional force. That is, the shock absorber 11G restricts the axial movement of the spring receiving member 91G in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 by the contact ring 81G, and suppresses the axial movement of the spring receiving member 91G in the direction opposite to the bottom portion 23 with respect to the cylinder 21. Therefore, in the shock absorber 11G, the relative movement between the cylinder 21 and the spring receiving member 91G can be effectively suppressed. Of course, since it is only necessary for the contact ring 81G to abut against the outer peripheral surface of the cylinder 21 and the inner peripheral surface of the cylindrical portion 92G of the spring receiving member 91G, the shock absorber 11G can suppress the deformation occurring in the cylinder 21.

[0122] Further, the shock absorber 11G has an outer serration portion 202G and an inner serration portion (not shown) formed on the radially outer side and the radially inner side of the contact ring 81G. The outer serration portion 202G abuts against the radially inner side of the cylindrical portion 92G, and the inner serration portion abuts against the radially outer side of the cylinder 21. Therefore, the shock absorber 11G can effectively suppress the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91G with a single contact ring 81G.

[0123] In the shock absorber 11G, a serration portion may be provided on the radially inner portion of the large-diameter cylindrical portion 103 of the cylindrical portion 92G that abuts against the outer serration portion 202G of the contact ring 81G. Also, in the shock absorber 11G, a serration portion may be provided on the groove bottom portion of the fitting groove 45, which is the radially outer portion of the cylinder 21 that abuts against the inner serration portion (not shown) of the contact ring 81G. By these means, the frictional force between the contact ring 81G and the spring receiving member 91G and the frictional force between the contact ring 81G and the cylinder 21 can be further increased. Therefore, the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91G can be more effectively suppressed.

[0124] [Embodiment 9] Next, the ninth embodiment will be mainly described focusing on the differences from the first embodiment based on FIGS. 15 and 16. For parts common to the first embodiment, the same names and the same reference numerals are used.

[0125] As shown in FIG. 15, the shock absorber 11H of the ninth embodiment includes a spring receiving member 91H that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91H has a cylindrical portion 92H that is partially different from the cylindrical portion 92 in place of the cylindrical portion 92. The cylindrical portion 92H has a small-diameter cylindrical portion 101H that is partially different from the small-diameter cylindrical portion 101 in place of the small-diameter cylindrical portion 101.

[0126] The small-diameter cylindrical portion 101H has a notch portion 111H (communication portion) at the tip end portion on the side opposite to the contact portion 102 in the axial direction thereof. The notch portion 111H is formed to be notched and recessed toward the contact portion 102 side in the axial direction of the small-diameter cylindrical portion 101H from the tip end surface on the side opposite to the contact portion 102 in the axial direction of the small-diameter cylindrical portion 101H. The tip end surface of the small-diameter cylindrical portion 101H where the notch portion 111H is formed is the end surface on the side opposite to the seating portion 93 in the axial direction of the cylindrical portion 92H. The notch portion 111H penetrates the small-diameter cylindrical portion 101H in the radial direction from its inner peripheral surface to its outer peripheral surface. In the small-diameter cylindrical portion 101H, the notch portion 111H is formed at one location. The groove bottom surface on the deeper side in the recessed direction of the notch portion 111H is arranged on the same plane. The notch portion 111H is formed such that at least a part of the axial length of the cylindrical portion 92H is shortened.

[0127] The small-diameter cylindrical portion 101H has a base portion 115H, which is similar to the base portion 115 of the small-diameter cylindrical portion 101 but is different in that the axial length is shorter than that of the base portion 115, and an extension portion 116H. The extension portion 116H extends from the base portion 115H to the side opposite to the contact portion 102 in the axial direction of the base portion 115H. In the small-diameter cylindrical portion 101H, the extension portion 116H is formed at one location. In the circumferential direction of the small-diameter cylindrical portion 101H, the notch portion 111H is longer than the extension portion 116H.

[0128] The shock absorber 11H of the ninth embodiment includes a non-slip member 131H (second movement suppressing portion). The non-slip member 131H is annular and has a shape in which a part thereof is broken in the circumferential direction. The non-slip member 131H is an integrally formed product made of a member formed of an elastically deformable rubber material. The non-slip member 131H has a higher friction coefficient than the spring receiving member 91H and the cylinder 21.

[0129] The anti-slip member 131H has a receiving groove 211H formed in the intermediate portion in its axial direction, which is recessed radially inward from the outer peripheral surface. The receiving groove 211H is annular and has a shape in which a part thereof is broken in the circumferential direction. As a result, one side of the receiving groove 211H in the axial direction of the anti-slip member 131H is a flange portion 212H that protrudes radially outward from the groove bottom surface of the receiving groove 211H. Also, on the side of the anti-slip member 131H opposite to the flange portion 212H of the receiving groove 211H in its axial direction, there is a flange portion 213H that protrudes radially outward from the groove bottom surface of the receiving groove 211H. Both the flange portion 212H and the flange portion 213H are annular and have a shape in which a part thereof is broken in the circumferential direction.

[0130] The spring receiving member 91H, in the same manner as the spring receiving member 91, fits into the second large-diameter portion 43 of the first cylindrical portion 31 of the cylinder 21 in the small-diameter cylindrical portion 101H of the cylindrical portion 92H, and fits into the contact ring 81 (see FIG. 1) attached to the cylinder 21 in the large-diameter cylindrical portion 103, and contacts the end surface on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81 at the contact portion 102. In this state, the notch portion 111H provided in the cylindrical portion 92H of the spring receiving member 91H communicates the outer peripheral surface side of the second large-diameter portion 43 of the cylinder 21 and the outer peripheral surface side of the small-diameter cylindrical portion 101H of the cylindrical portion 92H.

[0131] In this state, the anti-slip member 131H is arranged so that the extending portion 116H and the notch portion 111H of the spring receiving member 91H overlap with the position of the small-diameter cylindrical portion 101H in the axial direction, and is covered by the second large-diameter portion 43 of the cylinder 21 and the extending portion 116H of the small-diameter cylindrical portion 101H. Then, the anti-slip member 131H faces the outer surface on the outer side in the radial direction of the small-diameter cylindrical portion 101H of the extending portion 116H and the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21. In other words, the anti-slip member 131H is in a state of having a surface facing the cylindrical portion 92H and a surface facing the cylinder 21.

[0132] In this state, the band member 131 is arranged such that the accommodation groove 211H of the anti-slip member 131H and the position of the anti-slip member 131H in the axial direction overlap, and is wound around the groove bottom surface facing outward in the radial direction of the accommodation groove 211H. Then, the band member 131 is tightened. Then, the inner peripheral surface of the belt-like portion 132 of the band member 131 comes into contact with the groove bottom surface of the accommodation groove 211H of the anti-slip member 131H, and presses the anti-slip member 131H against the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21 and the outer surface of the extending portion 116H of the spring receiving member 91H on the outer side in the radial direction of the small-diameter cylinder portion 101H as shown in FIG. 16. As a result, the anti-slip member 131H comes into contact with the outer surface of the cylinder portion 92H and the outer peripheral surface of the cylinder 21. Specifically, a part of the anti-slip member 131H faces and abuts against the outer surface of the extending portion 116H on the outer side in the radial direction of the small-diameter cylinder portion 101H, and is pressed against this outer surface. At the same time, a part of the anti-slip member 131H enters into the notch portion 111H of the small-diameter cylinder portion 101H, faces the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21, and is pressed against this outer peripheral surface.

[0133] As described above, the anti-slip member 131H comes into contact with the outer surface of the cylinder portion 92H of the spring receiving member 91H and the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21, and is in a state of having a surface facing the cylinder portion 92H and a surface facing the second large-diameter portion 43. Further, the anti-slip member 131H faces the outer surface of the cylinder portion 92H of the spring receiving member 91H and is pressed against this outer surface. At the same time, the anti-slip member 131H faces the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21 and is in a state of being pressed against this outer peripheral surface.

[0134] The band member 131 causes the belt-like portion 132 to be fixed to the anti-slip member 131H by the frictional force of the anti-slip member 131H. At the same time, the anti-slip member 131H and the spring receiving member 91H and the cylinder 21 are fixed by the frictional force of the anti-slip member 131H. In other words, by the band member 131 and the anti-slip member 131H, the spring receiving member 91H is suppressed from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also suppressed from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the band member 131 and the anti-slip member 131H cause the anti-slip member 131H to abut against the outer peripheral surface of the cylinder 21 and the outer outer surface in the radial direction of the cylindrical portion 92H of the extending portion 116H, thereby suppressing the relative movement in the circumferential direction and the axial direction between the cylinder 21 and the spring receiving member 91H.

[0135] Therefore, the band member 131 and the anti-slip member 131H cause the anti-slip member 131H to abut against the outer peripheral surface of the cylinder 21 and the outer outer surface in the radial direction of the cylindrical portion 92H of the extending portion 116H, thereby suppressing the relative movement in the circumferential direction and the axial direction between the cylinder 21 and the spring receiving member 91H. The band member 131 and the anti-slip member 131H have an anti-slip member 131H that abuts against the cylinder 21 and suppresses sliding with respect to the cylinder 21. Note that the movement of the spring receiving member 91H toward the bottom portion 23 (see FIG. 1) side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81 (see FIG. 1).

[0136] In the shock absorber 11H of the ninth embodiment, the anti-slip member 131H among the band member 131 and the anti-slip member 131H abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92H of the spring receiving member 91H that covers at least a part of the cylinder 21. And the shock absorber 11H suppresses the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91H by the band member 131 and the anti-slip member 131H. Thus, since the anti-slip member 131H among the band member 131 and the anti-slip member 131H abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92H of the spring receiving member 91H, the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91H can be effectively suppressed by the frictional force. Also, since the anti-slip member 131H among the band member 131 and the anti-slip member 131H abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92H of the spring receiving member 91H, the shock absorber 11H can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91H by the frictional force. That is, in addition to the axial movement of the spring receiving member 91H in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 restricted by the contact ring 81 (see FIG. 1), the band member 131 and the anti-slip member 131H suppress the axial movement of the spring receiving member 91H in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, in the shock absorber 11H, the relative movement between the cylinder 21 and the spring receiving member 91H can be effectively suppressed. Of course, in the shock absorber 11H, since the anti-slip member 131H among the band member 131 and the anti-slip member 131H abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92H of the spring receiving member 91H, and it is only necessary for the band member 131 to clamp the anti-slip member 131H, the deformation generated in the cylinder 21 can be suppressed.

[0137] Also, the shock absorber 11H includes a notch portion 111H provided in the tube portion 92H of the spring receiving member 91H to communicate the outer peripheral surface side of the cylinder 21 and the outer peripheral surface side of the tube portion 92H. For this reason, the shock absorber 11H can easily bring the anti-slip member 131H among the band member 131 and the anti-slip member 131H into contact with the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the tube portion 92H.

[0138] Further, in the shock absorber 11H, the notch portion 111H is formed such that at least a part of the axial length of the cylindrical portion 92H is shortened. Specifically, the notch portion 111H is formed in a notch shape from the axial end surface of the cylindrical portion 92H. Therefore, the shock absorber 11H can easily form a configuration for the band member 131 and the anti-slip member 131H to pass through the cylindrical portion 92H in the radial direction.

[0139] Also, since the shock absorber 11H uses a band member 131 formed in a string shape, the band member 131 can be easily attached so that the anti-slip member 131H abuts on the outer peripheral surface of the cylinder 21 and the cylindrical portion 92H of the spring receiving member 91H.

[0140] Also, in the shock absorber 11H, the anti-slip member 131H among the band member 131 and the anti-slip member 131H abuts on the spring receiving member 91H and the cylinder 21, suppressing the sliding of the spring receiving member 91H with respect to the cylinder 21. Therefore, in the shock absorber 11H, the relative movement between the cylinder 21 and the spring receiving member 91H can be more effectively suppressed.

[0141] Also, since the anti-slip member 131H among the band member 131 and the anti-slip member 131H of the shock absorber 11H is formed of a rubber material, the relative movement between the cylinder 21 and the spring receiving member 91H can be more effectively suppressed. Also, since the anti-slip member 131H of the shock absorber 11H is formed of a rubber material, the anti-slip member 131H can be easily attached so as to abut on the outer peripheral surface of the cylinder 21 and the cylindrical portion 92H of the spring receiving member 91H. Moreover, since the anti-slip member 131H of the shock absorber 11H is formed of a rubber material, an increase in weight due to the anti-slip member 131H can be suppressed and an increase in component cost can be suppressed.

[0142] [Embodiment 10] Next, the 10th embodiment will be mainly described focusing on the differences from the 1st embodiment based on FIGS. 17 and 18. For the parts common to the 1st embodiment, the same names and the same reference numerals are used.

[0143] As shown in FIG. 17, the shock absorber 11J of the 10th embodiment includes a spring receiving member 91J that is partially different from the spring receiving member 91 in place of the spring receiving member 91. The spring receiving member 91J has a cylinder portion 92J that is partially different from the cylinder portion 92 in place of the cylinder portion 92. The cylinder portion 92J has a small-diameter cylinder portion 101J that is partially different from the small-diameter cylinder portion 101 in place of the small-diameter cylinder portion 101. As shown in FIG. 18, the small-diameter cylinder portion 101J is different from the small-diameter cylinder portion 101 in that a groove portion 111 and an extension portion 116 are not provided at the tip portion on the side opposite to the contact portion 102 in the axial direction thereof.

[0144] The shock absorber 11J of the 10th embodiment includes a non-slip member 131J (second movement suppressing portion). As shown in FIG. 17, the non-slip member 131J is formed in an annular shape. The non-slip member 131J is an integrally molded product made of a member formed of an elastically deformable rubber material. The non-slip member 131J has a higher coefficient of friction than the cylinder 21 and the spring receiving member 91J.

[0145] As shown in FIG. 18, the non-slip member 131J has a substrate portion 221J and an annular portion 222J. The substrate portion 221J is cylindrical. The annular portion 222J projects from the outer peripheral portion of the substrate portion 221J to one side in the axial direction of the substrate portion 221J. The annular portion 222J is cylindrical and coaxial with the substrate portion 221J. The inner diameter of the annular portion 222J is larger than the inner diameter of the substrate portion 221J. The outer diameter of the annular portion 222J is the same as the outer diameter of the substrate portion 221J. Therefore, the radial thickness of the annular portion 222J is thinner than the radial thickness of the substrate portion 221J.

[0146] The spring receiving member 91J, in the same manner as the spring receiving member 91, fits into the second large diameter portion 43 of the first cylindrical portion 31 in the small diameter cylindrical portion 101J of the cylindrical portion 92J, and in the large diameter cylindrical portion 103, fits into the contact ring 81 attached to the cylinder 21, and in the contact portion 102, contacts the end face on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81.

[0147] In this state, the anti-slip member 131J is arranged such that the annular portion 222J overlaps the small diameter cylindrical portion 101J in the axial direction of the small diameter cylindrical portion 101J. As a result, the annular portion 222J is in a state of facing the outer peripheral surface of the small diameter cylindrical portion 101J. In other words, the anti-slip member 131J is in a state of having a surface facing the spring receiving member 91J.

[0148] Also, in this state, the anti-slip member 131J is arranged such that in the axial direction of the cylinder 21 and the small diameter cylindrical portion 101J, the substrate portion 221J does not overlap with the small diameter cylindrical portion 101J and overlaps with the second large diameter portion 43 of the cylinder 21. As a result, the substrate portion 221J is in a state of facing the second large diameter portion 43 of the cylinder 21. In other words, the anti-slip member 131J is in a state of having a surface facing the cylinder 21.

[0149] In this state, the first band member 131 is arranged such that its position in the axial direction overlaps with the annular portion 222J of the anti-slip member 131J and is wound around the outer peripheral surface of the annular portion 222J. Then, this band member 131 is tightened. Thereupon, the inner peripheral surface of the band portion 132 of this band member 131 contacts the outer peripheral surface of the annular portion 222J of the anti-slip member 131J and presses the annular portion 222J against the outer peripheral surface of the small diameter cylindrical portion 101J of the spring receiving member 91J. As a result, the anti-slip member 131J faces the outer peripheral surface of the spring receiving member 91J and is in a state of contacting and pressing against this outer peripheral surface.

[0150] Also, in this state, the second band member 131 is arranged such that the substrate portion 221J of the anti-slip member 131J and the position in the axial direction of the anti-slip member 131J overlap, and is wound around the outer peripheral surface of the substrate portion 221J. Then, this band member 131 is tightened. Then, the inner peripheral surface of the band-shaped portion 132 of this band member 131 abuts against the outer peripheral surface of the substrate portion 221J of the anti-slip member 131J, and presses the substrate portion 221J against the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21. As a result, the anti-slip member 131J faces the outer peripheral surface of the cylinder 21 and is in a state of abutting against and pressing on this outer peripheral surface.

[0151] As described above, the anti-slip member 131J abuts against the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J and the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21, and has a state of having a surface facing the cylindrical portion 92J and a surface facing the second large-diameter portion 43. Also, the anti-slip member 131J faces the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J and is in a state of abutting against and pressing on this outer peripheral surface. At the same time, the anti-slip member 131J faces the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21 and is in a state of abutting against and pressing on this outer peripheral surface.

[0152] Both of the pair of band members 131 are in a state where the band-shaped portion 132 is fixed to the anti-slip member 131J by the frictional force of the anti-slip member 131J. At the same time, due to the frictional force of the anti-slip member 131J, the anti-slip member 131J, the spring receiving member 91J, and the cylinder 21 are in a fixed state. In other words, by the pair of band members 131 and the anti-slip member 131J, the spring receiving member 91J is suppressed from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21 and from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the pair of band members 131 and the anti-slip member 131J, by the tightening force of the pair of band members 131, cause the anti-slip member 131J to abut against the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J, thereby suppressing the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91J.

[0153] Therefore, the pair of band members 131 and the anti-slip member 131J are configured such that the anti-slip member 131J abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92J of the spring receiving member 91J, suppressing relative movement in the circumferential and axial directions between the cylinder 21 and the spring receiving member 91J. The pair of band members 131 and the anti-slip member 131J have an anti-slip member 131J that abuts against the cylinder 21 to suppress sliding with respect to the cylinder 21. Note that the movement of the spring receiving member 91J toward the bottom portion 23 (see FIG. 1) side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81.

[0154] In the shock absorber 11J of the tenth embodiment, the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92J of the spring receiving member 91J that covers at least a part of the cylinder 21. Then, the pair of band members 131 and the anti-slip member 131J suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91J. In this way, in the shock absorber 11J, the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. For this reason, in the shock absorber 11J, the anti-slip member 131J can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91J by its frictional force. Also, in the shock absorber 11J, the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. For this reason, in the shock absorber 11J, the anti-slip member 131J can effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91J by its frictional force. That is, in addition to the axial movement of the spring receiving member 91J in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 restricted by the contact ring 81, the pair of band members 131 and the anti-slip member 131J suppress the axial movement of the spring receiving member 91J in the direction opposite to the bottom portion 23 with respect to the cylinder 21, which is not restricted by the contact ring 81. Therefore, in the shock absorber 11J, the relative movement between the cylinder 21 and the spring receiving member 91J can be effectively suppressed. Of course, in the shock absorber 11J, since the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J, and it is only necessary for the pair of band members 131 to clamp the anti-slip member 131J, the deformation occurring in the cylinder 21 can be suppressed.

[0155] Further, since the shock absorber 11J uses a pair of band members 131 formed in a string shape, the anti-slip member 131J can be easily attached to the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92J of the spring receiving member 91J so as to be in contact therewith.

[0156] Further, in the shock absorber 11J, the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J abuts against the cylinder 21 and the spring receiving member 91J to suppress sliding with respect to the cylinder 21. Therefore, in the shock absorber 11J, the relative movement between the cylinder 21 and the spring receiving member 91J can be suppressed more effectively.

[0157] Further, in the shock absorber 11J, since the anti-slip member 131J among the pair of band members 131 and the anti-slip member 131J is formed of a rubber material, the relative movement between the spring receiving member 91J and the cylinder 21 can be suppressed more effectively. Also, in the shock absorber 11J, since the anti-slip member 131J is formed of a rubber material, the anti-slip member 131J can be easily attached so as to be in contact with the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. Moreover, in the shock absorber 11J, since the anti-slip member 131J is formed of a rubber material, an increase in weight due to the anti-slip member 131J can be suppressed and an increase in component cost can be suppressed.

[0158] Note that an annular accommodation groove 211H that is recessed radially inward from the outer peripheral surface similar to the anti-slip member 131H of the ninth embodiment may be formed on the outer peripheral surfaces of the substrate portion 221J and the annular portion 222J, respectively. In this case, one of the band members 131 will be wound around and tightened on the groove bottom surface of the accommodation groove formed in the substrate portion 221J. Also, the other band member 131 will be wound around and tightened on the groove bottom surface of the accommodation groove formed in the annular portion 222J.

[0159] [Eleventh Embodiment] Next, the 11th embodiment will be mainly described centering on the differences from the 10th embodiment with reference to FIGS. 19 and 20. For parts common to the 10th embodiment, the same names and the same reference numerals are used.

[0160] As shown in FIG. 19, the shock absorber 11K of the 11th embodiment includes a spring receiving member 91J similar to the shock absorber 11J.

[0161] The shock absorber 11K of the 11th embodiment includes an anti-slip member 131K (second movement suppressing portion) that is partially different from the anti-slip member 131J instead of the anti-slip member 131J. The anti-slip member 131K is formed in a cylindrical shape. The anti-slip member 131K is an integrally molded product made of a member formed of an elastically deformable rubber material. The anti-slip member 131K has a higher coefficient of friction than the spring receiving member 91J and the cylinder 21.

[0162] The anti-slip member 131K has a small-diameter cylindrical portion 251K, an intermediate annular portion 252K, and a large-diameter cylindrical portion 253K. The small-diameter cylindrical portion 251K is cylindrical. The intermediate annular portion 252K is annular. The intermediate annular portion 252K extends radially outward from one axial end of the small-diameter cylindrical portion 251K. The large-diameter cylindrical portion 253K is cylindrical. The outer diameter of the large-diameter cylindrical portion 253K is larger than the outer diameter of the small-diameter cylindrical portion 251K. As shown in FIG. 20, the inner diameter of the large-diameter cylindrical portion 253K is larger than the inner diameter of the small-diameter cylindrical portion 251K. The large-diameter cylindrical portion 253K extends axially from the outer peripheral edge of the intermediate annular portion 252K to the side opposite to the small-diameter cylindrical portion 251K.

[0163] As shown in FIG. 19, a slit 261K extending linearly along the axial direction of the small-diameter cylindrical portion 251K is formed at one location in the small-diameter cylindrical portion 251K. The slit 261K extends from the end face on the opposite side of the intermediate annular portion 252K in the axial direction of the small-diameter cylindrical portion 251K to a position near the intermediate annular portion 252K in the axial direction. The slit 261K penetrates the small-diameter cylindrical portion 251K in the radial direction of the small-diameter cylindrical portion 251K. A plurality of slits 261K may be formed at equal intervals in the circumferential direction of the small-diameter cylindrical portion 251K in the small-diameter cylindrical portion 251K.

[0164] As shown in FIG. 19, a slit 262K extending linearly along the axial direction of the large-diameter cylindrical portion 253K is formed at one location in the large-diameter cylindrical portion 253K. The slit 262K extends from the end face on the opposite side of the intermediate annular portion 252K in the axial direction of the large-diameter cylindrical portion 253K to a position near the intermediate annular portion 252K in the axial direction. The slit 262K penetrates the large-diameter cylindrical portion 253K in the radial direction of the large-diameter cylindrical portion 253K. A plurality of slits 262K may be formed at equal intervals in the circumferential direction of the large-diameter cylindrical portion 253K in the large-diameter cylindrical portion 253K.

[0165] As shown in FIG. 20, the spring receiving member 91J, in the same manner as the spring receiving member 91, fits into the second large-diameter portion 43 of the first cylindrical portion 31 in the small-diameter cylindrical portion 101J of the cylindrical portion 92J, and in the large-diameter cylindrical portion 103, fits into the contact ring 81 attached to the cylinder 21, and contacts the end face on the opening 24 (see FIG. 1) side in the axial direction of the contact ring 81 at the contact portion 102.

[0166] In this state, the anti-slip member 131K is arranged such that in the axial direction of the small-diameter cylindrical portion 101J of the spring receiving member 91J, the large-diameter cylindrical portion 253K overlaps with the small-diameter cylindrical portion 101J in position. Thereby, the large-diameter cylindrical portion 253K is in a state of facing the outer peripheral surface of the small-diameter cylindrical portion 101J. In other words, the anti-slip member 131K is in a state of having a surface facing the spring receiving member 91J. Also, in this state, the anti-slip member 131K is arranged such that in the axial direction of the cylinder 21 and the small-diameter cylindrical portion 101J, the small-diameter cylindrical portion 251K does not overlap with the small-diameter cylindrical portion 101J in position and overlaps with the second large-diameter portion 43 of the cylinder 21 in position. Thereby, the small-diameter cylindrical portion 251K is in a state of facing the second large-diameter portion 43 of the cylinder 21. In other words, the anti-slip member 131K is in a state of having a surface facing the cylinder 21.

[0167] In this state, the first band member 131 is arranged such that the position in the axial direction of the portion where the slit 262K of the large-diameter cylindrical portion 253K of the anti-slip member 131K is formed overlaps, and is wound around the outer peripheral surface on the outer side in the radial direction of the large-diameter cylindrical portion 253K. Then, this band member 131 is tightened. Then, the inner peripheral surface of this band member 131 abuts on the large-diameter cylindrical portion 253K of the anti-slip member 131K and presses the anti-slip member 131K against the outer peripheral surface of the small-diameter cylindrical portion 101J of the spring receiving member 91J. Thereby, the anti-slip member 131K faces, abuts on, and is pressed against the outer peripheral surface of the spring receiving member 91J.

[0168] Also, in this state, the second band member 131 is arranged such that the position in the axial direction of the slit 261K of the small-diameter cylindrical portion 251K of the anti-slip member 131K overlaps with the portion where the slit 261K is formed, and is wound around the outer peripheral surface of the small-diameter cylindrical portion 251K of the anti-slip member 131K. Then, this band member 131 is tightened. Then, the inner peripheral surface of this band member 131 abuts against the small-diameter cylindrical portion 251K of the anti-slip member 131K, and presses the anti-slip member 131K against the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21. As a result, the anti-slip member 131K faces the outer peripheral surface of the cylinder 21 and is in a state of being abutted against and pressed against this outer peripheral surface.

[0169] As described above, the anti-slip member 131K abuts against the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J and the outer peripheral surface of the second large-diameter portion 43 of the cylinder 21, and is in a state of having a surface facing the cylindrical portion 92J and a surface facing the cylinder 21. Also, the anti-slip member 131K faces the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J and is abutted against and pressed against this outer peripheral surface. At the same time, the anti-slip member 131K faces the outer peripheral surface of the cylinder 21 and is in a state of being abutted against and pressed against this outer peripheral surface.

[0170] Both of the pair of band members 131 are in a state where the belt-like portion 132 is fixed to the anti-slip member 131K by the frictional force of the anti-slip member 131K. At the same time, by the frictional force of the anti-slip member 131K, the anti-slip member 131K, the spring receiving member 91J, and the cylinder 21 are in a fixed state. In other words, by the pair of band members 131 and the anti-slip member 131K, the spring receiving member 91J is suppressed from moving to both sides in the circumferential direction of the cylinder 21 with respect to the cylinder 21, and is also suppressed from moving to both sides in the axial direction of the cylinder 21 with respect to the cylinder 21. In other words, the pair of band members 131 and the anti-slip member 131K cause the anti-slip member 131K to abut against the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the cylindrical portion 92J of the spring receiving member 91J by the tightening force of the pair of band members 131, and suppress the relative movement in the circumferential direction and the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91J.

[0171] Therefore, the pair of band members 131 and the anti-slip member 131K are such that the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the cylindrical portion 92J, suppressing the relative movement in the circumferential direction and the axial direction between the cylinder 21 and the spring receiving member 91J. The pair of band members 131 and the anti-slip member 131K have an anti-slip member 131K that abuts against the cylinder 21 to suppress sliding with respect to the cylinder 21. Note that the movement of the spring receiving member 91J toward the bottom portion 23 side in the axial direction of the cylinder 21 with respect to the cylinder 21 is restricted by the contact ring 81.

[0172] In the shock absorber 11K of the 11th embodiment, the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92J of the spring receiving member 91J that covers at least a part of the cylinder 21. And the shock absorber 11K suppresses the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91J by the pair of band members 131 and the anti-slip member 131K. In this way, in the shock absorber 11K, the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. For this reason, the shock absorber 11K can effectively suppress the relative movement in the circumferential direction between the cylinder 21 and the spring receiving member 91J by the frictional force of the pair of band members 131 and the anti-slip member 131K. Also, in the shock absorber 11K, the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. For this reason, the shock absorber 11K can also effectively suppress the relative movement in the axial direction between the cylinder 21 and the spring receiving member 91J by the frictional force of the anti-slip member 131K. That is, in addition to the axial movement of the spring receiving member 91J in the direction of the bottom portion 23 (see FIG. 1) with respect to the cylinder 21 restricted by the contact ring 81, the pair of band members 131 and the anti-slip member 131K suppress the axial movement of the spring receiving member 91J in the direction opposite to the bottom portion 23 with respect to the cylinder 21 that is not restricted by the contact ring 81. Therefore, in the shock absorber 11K, the relative movement between the cylinder 21 and the spring receiving member 91J can be effectively suppressed. Of course, in the shock absorber 11K, since the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J, and it is only necessary for the pair of band members 131 to tighten the anti-slip member 131K, the deformation generated in the cylinder 21 can be suppressed.

[0173] In addition, since the shock absorber 11K uses a pair of band members 131 formed in a string shape, the pair of band members 131 can be easily attached so that the anti-slip member 131K abuts against the outer peripheral surface of the cylinder 21 and the cylindrical tube portion 92J of the spring receiving member 91J.

[0174] Further, in the shock absorber 11K, the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K abuts against the cylinder 21 and the spring receiving member 91J to suppress sliding with respect to the cylinder 21. Therefore, the shock absorber 11K can more effectively suppress the relative movement between the cylinder 21 and the spring receiving member 91J.

[0175] In addition, since the anti-slip member 131K among the pair of band members 131 and the anti-slip member 131K of the shock absorber 11K is formed of a rubber material, the relative movement between the spring receiving member 91J and the cylinder 21 can be more effectively suppressed. Further, since the anti-slip member 131K of the shock absorber 11K is formed of a rubber material, the anti-slip member 131K can be easily attached so as to abut against the outer peripheral surface of the cylinder 21 and the tube portion 92J of the spring receiving member 91J. Moreover, since the anti-slip member 131K of the shock absorber 11K is formed of a rubber material, an increase in weight due to the anti-slip member 131K can be suppressed and an increase in component cost can be suppressed.

Industrial Applicability

[0176] According to the shock absorber according to the above aspect of the present invention, relative movement between the cylinder and the spring receiving member can be suppressed.

Explanation of Signs

[0177] 11, 11A~11H, 11J, 11K… buffers, 21, 21F… cylinders, 31, 31F… first cylindrical parts (cylindrical parts), 55… pistons, 65… piston rods, 81, 81G… contact rings (first movement restraining parts), 91, 91A~91H, 91J… spring receiving members, 92, 92A~92H, 92J… cylindrical parts, 93… seating parts, 111, 111D, 111E… groove parts (communication parts), 111A… through holes (communication parts), 111B, 111H… notch parts (communication parts), 116F… axially protruding parts, 131… band members (second movement restraining parts), 131C, 131E, 131F… ring members (second movement restraining parts), 131H, 131J, 131K… anti-slip members (second movement restraining parts) 161D… protruding parts, 165D, 165E… dust covers, 175E… stepped parts, 202G… outer serration parts (second movement restraining parts).

Claims

1. A cylinder, a piston slidably provided within the cylinder, and a piston rod connected to the piston, wherein the shock absorber further comprises: a first movement restraining portion provided on the cylindrical portion of the cylinder and protruding radially outward; a cylindrical tube portion covering at least a part of the cylinder, and a seating portion on which a suspension spring is seated; a spring receiving member that abuts against the first movement restraining portion to restrain axial relative movement with respect to the cylinder; a second movement restraining portion formed in a string shape that abuts against the outer peripheral surface of the cylinder and the outer peripheral surface of the tube portion to restrain circumferential relative movement between the cylinder and the spring receiving member. The shock absorber comprising the above components.

2. The shock absorber according to Claim 1, wherein the spring receiving member is provided on the tube portion and has a communication portion that communicates the outer peripheral surface of the cylinder with the outer peripheral surface side of the tube portion, and the second movement restraining portion is arranged such that at least a part thereof enters the communication portion.

3. The shock absorber according to Claim 2, wherein the communication portion is formed such that at least a part of the axial length of the tube portion is shortened.

4. The shock absorber according to Claim 2, wherein the communication portion is a groove portion formed in a notch shape from the axial end surface of the tube portion.

5. The shock absorber according to Claim 2, wherein the communication portion is a through hole provided in the tube portion.

6. A cylinder, a piston slidably provided within the cylinder, and a piston rod connected to the piston, wherein the shock absorber further comprises: a first movement restraining portion provided on the cylindrical portion of the cylinder and protruding radially outward; a cylindrical tube portion covering at least a part of the cylinder, and a seating portion on which a suspension spring is seated; a spring receiving member that abuts against the first movement restraining portion to restrain axial relative movement with respect to the cylinder; a second movement restraining portion that abuts against the outer peripheral surface of the cylinder and the tube portion to restrain circumferential relative movement between the cylinder and the spring receiving member; wherein the shock absorber comprises the above components, the spring receiving member has a communication portion provided on the tube portion that communicates the outer peripheral surface of the cylinder with the outer peripheral surface side of the tube portion, the second movement restraining portion is arranged such that at least a part thereof enters the communication portion, the communication portion is a groove portion formed in a notch shape from the axial end surface of the tube portion, and a protruding portion protruding radially outward is formed on the axial end surface of the groove portion. A shock absorber in which at least a part of a dust cover covering at least a part of the cylinder or at least a part of the cylindrical portion is restricted from axial movement by the protruding portion.

7. A cylinder, a piston slidably provided in the cylinder, a piston rod connected to the piston, and a shock absorber comprising: a first movement restricting portion provided on the cylindrical portion of the cylinder and protruding radially outward; a cylindrical portion covering at least a part of the cylinder, and a seating portion on which a suspension spring is seated; a spring receiving member having a portion that abuts against the first movement restricting portion to restrict axial relative movement with respect to the cylinder; a second movement restricting portion that abuts against the outer peripheral surface of the cylinder and the cylindrical portion to restrict circumferential relative movement between the cylinder and the spring receiving member; and comprising: the spring receiving member is provided on the cylindrical portion and has a communication portion that communicates the outer peripheral surface of the cylinder with the outer peripheral surface side of the cylindrical portion; the second movement restricting portion is arranged so that at least a part thereof enters the communication portion; the communication portion is a groove portion formed in a notch shape from the axial end surface of the cylindrical portion; the second movement restricting portion has a stepped portion formed such that a part of the outer peripheral surface has a step; a shock absorber in which at least a part of a dust cover covering at least a part of the cylinder or at least a part of the cylindrical portion is restricted from axial movement by the stepped portion.

8. The shock absorber according to any one of claims 1 to 7, wherein the second movement restricting portion is formed of a resin material or a rubber material.

9. A cylinder, a piston slidably provided in the cylinder, a piston rod connected to the piston, and a shock absorber comprising: a spring receiving member disposed on the outer peripheral surface side of the cylinder and having a cylindrical portion covering at least a part of the cylinder and a seating portion on which a suspension spring is seated; a first movement restricting portion provided on the outer peripheral surface of the cylinder to restrict axial movement of the spring receiving member; a communication portion provided in the cylindrical portion to communicate the outer peripheral surface side of the cylinder with the outer peripheral surface side of the cylindrical portion; a second movement restricting portion having at least a part of its inner peripheral surface abutting against the outer peripheral surface of the cylindrical portion and the outer peripheral surface of the cylinder, and having a surface facing the cylindrical portion and a surface facing the cylinder, and being arranged so that at least a part thereof enters the communication portion; and a shock absorber comprising:

10. The shock absorber according to any one of claims 1 to 3, The second movement suppression part is a shock absorber including a non-slip member that abuts against the cylinder and suppresses sliding with respect to the cylinder. ​

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