Shock absorber, shock absorber manufacturing method, valve, and valve manufacturing method

Abstract

This damper comprises: a cylinder; a piston provided in the cylinder; a rod one end of which is connected to the piston and the other end of which extends out of the cylinder; and a body valve that defines two chambers in the cylinder. The body valve includes: a valve body that has a working fluid passageway; at least one disc-shaped valve member that opens and closes the working fluid passageway; a regulating member which is provided on the side of the valve member opposite from the valve body and is thicker than the valve member; and a pin member which is disposed around an interior perimeter of the valve member and the regulating member, and has a flange at one end and a crimping portion at the other end thereof, the pin member integrating the valve body, the valve member, and the regulating member in an axially aligned manner. The outer diameter of an opposite portion of the pin member opposite the regulating member is smaller than that of portions of the pin member other than the opposite portion in the axial direction.

Description

[Technical Field]

[0001] The present invention relates to a shock absorber, a method for manufacturing a shock absorber, a valve, and a method for manufacturing a valve. This application claims priority based on Japanese Patent Application No. 2022-107764, filed on July 4, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] There is a hydraulic shock absorber having a structure in which a pin member having a flange portion on one side is inserted into a valve body and a valve member, and the other side of the pin member is crimped to integrate the valve body and the valve member with the pin member (see, for example, Patent Documents 1 and 2 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent No. 5397640 [Patent Document 2] Japanese Patent No. 2642109 Summary of the Invention [Problem to be solved by the invention]

[0004] If the pin member is crimped, it may not be possible to obtain stable damping force characteristics.

[0005] Therefore, an object of the present invention is to provide a shock absorber, a method for manufacturing a shock absorber, a valve, and a method for manufacturing a valve that are capable of obtaining stable damping force characteristics. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following aspects. The first aspect of the present invention is A cylinder; a piston provided in the cylinder; a rod having one end connected to the piston and the other end extending from the cylinder; a body valve that divides the interior of the cylinder into two chambers; and The body valve, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; Equipped with an outer diameter of a portion of the pin member facing the restricting member is smaller than an outer diameter of a portion of the pin member other than the portion of the pin member facing the restricting member in the axial direction; It is a shock absorber.

[0007] A second aspect of the present invention is A cylinder; a piston provided in the cylinder; a body valve that divides the interior of the cylinder into two chambers; and The body valve, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; A manufacturing method of a shock absorber comprising: a residual axial force applying step of applying a residual axial force to the valve body and the valve member; a pressing step of pressing the regulating member toward the pin member; a crimping step of forming the crimped portion by crimping; Includes.

[0008] A third aspect of the present invention is A valve used in a shock absorber, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; Equipped with The gap between the restricting member and the pin member is smaller than the gap between the valve body and the pin member.

[0009] A fourth aspect of the present invention is Used in shock absorbers, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; A method for manufacturing a valve having a residual axial force applying step of applying a residual axial force to the valve body and the valve member; a pressing step of pressing the regulating member toward the pin member; a crimping step of forming the crimped portion by crimping; Includes. [Effects of the Invention]

[0010] According to the above aspects of the present invention, it is possible to obtain stable damping force characteristics. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing a shock absorber according to a first embodiment of the present invention, that is, a cross-sectional view of the shock absorber taken along a cross section including a central axis CL thereof, where the symbol CL shown in each drawing indicates the central axis of the shock absorber. [Figure 2] FIG. 2 is a cross-sectional view showing a body valve of the first embodiment, taken along a cross section including a central axis line CL. [Figure 3] FIG. 3 is a plan view showing a washer of the body valve of the first embodiment before assembly. [Figure 4] 4 is a cross-sectional view taken along line AA in FIG. 3, showing the washer of the body valve of the first embodiment before assembly. FIG. [Figure 5] FIG. 10 is a cross-sectional view showing a state after the shaft portion insertion step and before the clamping step in the manufacturing method of the shock absorber and body valve of the first embodiment, taken along a cross section including the central axis line CL. [Figure 6] 10 is a cross-sectional view illustrating a clamping step, a residual axial force applying step, and a pressing step in the manufacturing method of the shock absorber and the body valve of the first embodiment, the cross-sectional view including the central axis line CL. FIG. [Figure 7] 7 is a partially enlarged cross-sectional view of part B in FIG. 6, showing a state after a pressing step and before a crimping step in the manufacturing method of the shock absorber and the body valve of the first embodiment. FIG. [Figure 8] FIG. 8 is a partially enlarged cross-sectional view showing a main part of the body valve of the first embodiment, corresponding to FIG. 7. [Figure 9] FIG. 10 is a cross-sectional view illustrating a clamping step, a residual axial force applying step, and a pressing step in a first modified example of the manufacturing method of the shock absorber and the body valve of the first embodiment, the cross-sectional view being taken along a cross section including the central axis line CL. [Figure 10]10 is a side view showing a clamp member used in a first modified example of the manufacturing method for the shock absorber and the body valve of the first embodiment. FIG. [Figure 11] FIG. 10 is a plan view showing a washer before assembly in a second modified example of the body valve of the first embodiment. [Figure 12] 12 is a view showing a washer of a second modified example of the body valve of the first embodiment before assembly, and is a cross-sectional view taken along CC in FIG. 11. FIG. [Figure 13] FIG. 10 is a plan view showing a washer before assembly in a third modified example of the body valve of the first embodiment. [Figure 14] FIG. 14 is a view showing a washer before assembly in a third modification of the body valve of the first embodiment, and is a cross-sectional view taken along the line DD in FIG. [Figure 15] 15 is a cross-sectional view corresponding to FIG. 14, showing a washer before assembly in a fourth modified example of the body valve of the first embodiment. FIG. [Figure 16] FIG. 10 is a cross-sectional view showing a body valve of a shock absorber according to a second embodiment of the present invention, taken along a cross section including a central axis line CL. [Figure 17] FIG. 10 is a cross-sectional view illustrating a residual axial force applying step and a pressing step in the manufacturing method of the shock absorber and the body valve according to the second embodiment, the cross-sectional view being taken along a cross section including the central axis line CL. DETAILED DESCRIPTION OF THE INVENTION

[0012] [First embodiment] The first embodiment will be described below with reference to Figures 1 to 15. In each figure, the reference character CL indicates the central axis of the shock absorber. The same applies to the other embodiments and modified examples.

[0013] FIG. 1 shows a shock absorber 11 according to a first embodiment. The shock absorber 11 is used in a suspension device for a vehicle such as an automobile or a railway vehicle. Specifically, the shock absorber 11 is used in a strut-type suspension for an automobile. The shock absorber 11 includes a cylinder 17 having an inner cylinder 15 and an outer cylinder 16.

[0014] The inner cylinder 15 is cylindrical. The outer cylinder 16 is cylindrical with a bottom. The outer cylinder 16 has a larger diameter than the inner cylinder 15 and is provided on the outer peripheral side of the inner cylinder 15. Therefore, the shock absorber 11 is a double-cylinder shock absorber. A reservoir chamber 18 (chamber) is formed between the outer cylinder 16 and the inner cylinder 15.

[0015] The outer cylinder 16 is an integrally molded product made of a single metal member. The outer cylinder 16 has a side wall portion 21 and a bottom portion 22. The side wall portion 21 is cylindrical. The bottom portion 22 is disk-shaped and closes one axial end of the side wall portion 21. The outer cylinder 16 has an opening 23 on the side of the side wall portion 21 opposite the bottom portion 22.

[0016] The shock absorber 11 has a valve body 25 and a rod guide 26. The valve body 25 is annular, is provided at one axial end of the inner cylinder 15, and is placed on the bottom 22 of the outer cylinder 16. The rod guide 26 is annular, and is provided at the axial end of the inner cylinder 15 and the outer cylinder 16 opposite the valve body 25.

[0017] The valve body 25 constitutes a body valve 30 (valve). The valve body 25 has, on its outer periphery, a small outer diameter portion 31 and a large outer diameter portion 32 that is larger in diameter than the small outer diameter portion 31. The rod guide 26 also has, on its outer periphery, a small outer diameter portion 33 and a large outer diameter portion 34 that is larger in diameter than the small outer diameter portion 33.

[0018] One axial end of the inner cylinder 15 is fitted into the small-diameter outer diameter portion 31 of the valve body 25. The inner cylinder 15 is placed on the bottom 22 of the outer cylinder 16 via the valve body 25. The other axial end of the inner cylinder 15 is fitted into the small-diameter outer diameter portion 33 of the rod guide 26. The large-diameter outer diameter portion 32 of the rod guide 26 is fitted into the side wall portion 21 of the outer cylinder 16. Therefore, the inner cylinder 15 is fitted into the side wall portion 21 of the outer cylinder 16 via the rod guide 26. In this state, the inner cylinder 15 is positioned radially relative to the outer cylinder 16.

[0019] The valve body 25 has a partition portion 36 and a leg portion 37 . The partition 36 is a circular plate with holes. The partition 36 includes the small outer diameter portion 31 and a portion of the large outer diameter portion 32 on the small outer diameter portion 31 side in the axial direction.

[0020] The leg portion 37 protrudes from the outer periphery of the partition portion 36 along the axial direction of the partition portion 36. The leg portion 37 is annular. A portion of the leg portion 37 is formed on the opposite side of the large-diameter outer diameter portion 32 from the small-diameter outer diameter portion 31 in the axial direction. A passage groove 38 is formed on the leg portion 37 on the opposite side of the axial direction from the partition portion 36. The passage groove 38 penetrates the leg portion 37 in the radial direction of the leg portion 37. A plurality of passage grooves 38 of the same shape are provided on the leg portion 37 at equal intervals in the circumferential direction.

[0021] The legs 37 of the valve body 25 abut against the bottom 22 of the outer cylinder 16. The space between the valve body 25 and the bottom 22 of the outer cylinder 16 is in communication with the inner cylinder 15 and the outer cylinder 16 via a passage groove 38. As a result, the space between the valve body 25 and the bottom 22 constitutes a reservoir chamber 18, just like the space between the inner cylinder 15 and the outer cylinder 16.

[0022] The shock absorber 11 has a closing member 41. The closing member 41 is annular and is provided on the opposite side of the rod guide 26 from the bottom 22. The closing member 41 is fitted into the inner periphery of the side wall 21 of the outer cylinder 16. A locking portion 43 is formed on the end of the side wall 21 opposite the bottom 22 in the axial direction. The locking portion 43 is formed by plastically deforming the cylindrical side wall 21 radially inward by crimping, such as curling. The closing member 41 is sandwiched between the locking portion 43 and the rod guide 26. The closing member 41 closes the opening 23 of the outer cylinder 16, and is specifically an oil seal.

[0023] The shock absorber 11 has a piston 45. A sliding member 46 made of synthetic resin is attached to the outer periphery of the piston 45. The piston 45 is slidably provided in the inner tube 15 of the cylinder 17 via the sliding member 46. The piston 45 divides the interior of the inner tube 15 into two chambers: a first chamber 48 and a second chamber 49 (chamber). The first chamber 48 is provided between the piston 45 and the rod guide 26 in the inner tube 15. The second chamber 49 is provided between the piston 45 and the valve body 25 in the inner tube 15. The second chamber 49 is defined as the reservoir chamber 18 by the valve body 25. In other words, the valve body 25 of the body valve 30 divides the interior of the cylinder 17 into two chambers: the second chamber 49 and the reservoir chamber 18.

[0024] In the cylinder 17, a first chamber 48 and a second chamber 49 are filled with oil L as a working fluid. In addition, in the cylinder 17, a reservoir chamber 18 is filled with gas G and oil L as a working fluid.

[0025] The shock absorber 11 has a rod 50 . The rod 50 has a main shaft portion 51 and an attachment shaft portion 52 . The outer diameter of the mounting shaft portion 52 is smaller than the outer diameter of the main shaft portion 51. The mounting shaft portion 52 is provided at one end of the main shaft portion 51 in the axial direction.

[0026] The rod 50 has a mounting shaft portion 52 at one axial end connected to the piston 45, and a main shaft portion 51 at the other axial end extending from the outer tube 16 of the cylinder 17 to the outside via the opening 23. The piston 45 is connected to the mounting shaft portion 52 of the rod 50 with a nut 53. The main shaft portion 51 of the rod 50 extends to the outside from the inner tube 15 and the outer tube 16 through the rod guide 26 and the closing member 41. The main shaft portion 51 of the rod 50 is guided by the rod guide 26, and moves axially together with the piston 45 relative to the inner tube 15 and the outer tube 16. The closing member 41 closes the gap between the opening 23 of the outer tube 16 and the rod 50, thereby restricting leakage of the oil L in the inner tube 15 and the gas G and oil L in the reservoir chamber 18 to the outside.

[0027] Axially penetrating passages 55 and 56 are formed in the piston 45. The passages 55 and 56 are capable of communicating between the first chamber 48 and the second chamber 49. The passages 55 and 56 are passages through which oil L flows.

[0028] The shock absorber 11 has a disc valve 57 and a disc valve 58 . The disc valve 57 is annular, and is provided on the opposite side of the piston 45 from the bottom portion 22 in the axial direction. The disc valve 57 closes the passage 55 by abutting against the piston 45. The passage 55 is always open to the second chamber 49.

[0029] The disc valve 58 is annular, and is provided on the bottom 22 side in the axial direction of the piston 45. The disc valve 58 closes the passage 56 by abutting against the piston 45. The passage 56 is always open to the first chamber 48. The disc valves 57 and 58 are connected to the mounting shaft portion 52 of the rod 50 together with the piston 45 .

[0030] The direction in which the rod 50 increases its amount of penetration into the inner cylinder 15 and the outer cylinder 16, i.e., into the cylinder 17, is the compression side, which shortens the overall length of the shock absorber 11. The disc valve 57 opens the passage 55 when the rod 50 moves toward the compression side, the piston 45 moves in a direction narrowing the second chamber 49, and the pressure in the second chamber 49 becomes higher than the pressure in the first chamber 48 by a predetermined value or more. This allows the oil L in the second chamber 49 to flow through the passage 55 to the first chamber 48. The disc valve 57 is a damping valve that generates a damping force at this time. A fixed orifice (not shown) is formed in at least one of the piston 45 and the disc valve 57. This fixed orifice allows communication between the second chamber 49 and the first chamber 48 through the passage 55 even when the disc valve 57 is in the most closed state of the passage 55.

[0031] The direction in which the rod 50 protrudes more from the inner and outer cylinders 15 and 16, i.e., from the cylinder 17, is the extension side, which increases the overall length of the shock absorber 11. The disc valve 58 opens the passage 56 when the rod 50 moves in the extension side and the piston 45 moves in a direction narrowing the first chamber 48, causing the pressure in the first chamber 48 to exceed the pressure in the second chamber 49 by a predetermined value or more. This allows the oil L in the first chamber 48 to flow through the passage 56 to the second chamber 49. The disc valve 58 is a damping valve that generates a damping force at this time. A fixed orifice (not shown) is formed in at least one of the piston 45 and the disc valve 58. This fixed orifice allows communication between the first chamber 48 and the second chamber 49 through the passage 56, even when the disc valve 58 is in the most closed state of the passage 56.

[0032] The valve body 25 has a passage 61 and a passage 62 (working fluid passage) at the position of the partition 36. The passages 61, 62 penetrate the partition 36 in the axial direction of the partition 36. The passages 61, 62 can communicate between the second chamber 49 and the reservoir chamber 18. Oil L flows through the passages 61, 62.

[0033] The body valve 30 includes a disc valve 65, a disc valve 66 (valve member), and a pin member 68. The disc valve 65 is provided on the bottom 22 side in the axial direction of the valve body 25. The disc valve 65 is annular, and closes the passage 61 by abutting against the valve body 25.

[0034] The disc valve 66 is provided on the opposite side of the valve body 25 in the axial direction from the bottom portion 22. The disc valve 66 is annular, and closes the passage 62 by abutting against the valve body 25. The pin member 68 connects the disc valves 65, 66 to the valve body 25 and integrates them together.

[0035] The body valve 30, which is composed of the valve body 25, disc valves 65, 66, and pin member 68, divides the cylinder 17 into two chambers: the second chamber 49 and the reservoir chamber 18. The passage 61 is always in communication with the second chamber 49, and the passage 62 is always in communication with the reservoir chamber 18.

[0036] In the shock absorber 11, when the rod 50 moves toward the compression side and the piston 45 moves in a direction narrowing the second chamber 49, causing the pressure in the second chamber 49 to exceed the pressure in the reservoir chamber 18 by a predetermined value or more, the disc valve 65 of the body valve 30 opens the passage 61. This causes the oil L in the second chamber 49 to flow into the reservoir chamber 18 through the passage 61. At that time, the disc valve 65 generates a damping force. The disc valve 65 is a damping valve.

[0037] In the shock absorber 11, when the rod 50 moves toward the extension side and the piston 45 moves in a direction narrowing the first chamber 48, causing the pressure in the second chamber 49 to drop below the pressure in the reservoir chamber 18, the disc valve 66 of the body valve 30 opens the passage 62. This allows the oil L in the reservoir chamber 18 to flow into the second chamber 49 through the passage 62. At that time, the disc valve 66 allows the oil L to flow from the reservoir chamber 18 into the second chamber 49 without generating any substantial damping force. The disc valve 66 is a suction valve.

[0038] A locking member 71 is fixed to the rod 50 between the piston 45 and the rod guide 26. A buffer member 72 is provided to the rod 50 between the locking member 71 and the rod guide 26. The buffer member 72 abuts against the locking member 71. When the rod 50 moves to a predetermined position on the extension side, the buffer member 72 abuts against the rod guide 26 to absorb the impact.

[0039] The valve body 25 is made of metal and has a disk shape with holes. The valve body 25 has an inner circumferential surface 81 (shown in FIG. 2) at the radial center thereof that is a cylindrical surface.

[0040] The partition portion 36 of the valve body 25 has a main body portion 83 , a fixed seat portion 84 , an inner seat portion 85 , an outer seat portion 86 , a fixed seat portion 88 , and a seat portion 89 . The main body 83 is a disk-shaped body with holes, and an axially intermediate portion of the inner circumferential surface 81 is disposed on the main body 83.

[0041] The fixed seat portion 84, the inner seat portion 85 and the outer seat portion 86 are all provided on the opposite side of the main body portion 83 from the leg portion 37 in the axial direction. The fixed seat portion 84 is annular and surrounds the inner circumferential surface 81 radially outside of the inner circumferential surface 81. The fixed seat portion 84 protrudes from the main body portion 83 along the axial direction of the main body portion 83 to the side opposite the leg portion 37.

[0042] The inner seat portion 85 is annular and surrounds the fixed seat portion 84 on the radial outside of the main body portion 83. The inner seat portion 85 is spaced apart from the fixed seat portion 84 in the radial direction of the main body portion 83. The inner seat portion 85 protrudes from the main body portion 83 along the axial direction of the main body portion 83 to the side opposite the leg portion 37.

[0043] The outer seat portion 86 is annular and surrounds the inner seat portion 85 on the radial outside of the main body portion 83. The outer seat portion 86 is spaced apart from the inner seat portion 85 in the radial direction of the main body portion 83. The outer seat portion 86 protrudes from the main body portion 83 in the axial direction of the main body portion 83 on the side opposite to the leg portion 37. In the axial direction of the valve body 25, the fixed seat portion 84, the inner seat portion 85 and the outer seat portion 86 are aligned with one another in height position of the protruding tip surfaces.

[0044] The fixed seat portion 88 and the seat portion 89 are both provided on the opposite side of the main body portion 83 from the fixed seat portion 84, the inner seat portion 85, and the outer seat portion 86 in the axial direction. The fixed seat portion 88 is annular and surrounds the inner circumferential surface 81 radially outside of the inner circumferential surface 81. The fixed seat portion 88 protrudes from the main body portion 83 along the axial direction of the main body portion 83 to the opposite side from the fixed seat portion 84.

[0045] The seat portion 89 is annular and surrounds the fixed seat portion 88 on the radially outer side of the main body portion 83. The seat portion 89 is spaced apart from the fixed seat portion 88 in the radial direction of the main body portion 83. The seat portion 89 protrudes from the main body portion 83 to the side opposite the inner seat portion 85 along the axial direction of the main body portion 83. In the axial direction of the valve body 25, the height position of the protruding tip end surface of the seat portion 89 is slightly higher than the height position of the protruding tip end surface of the fixed seat portion 88.

[0046] One end of the passage 61 opens between the fixed seat portion 84 and the inner seat portion 85, and the other end opens between the fixed seat portion 88 and the seat portion 89. A plurality of passages 61 are formed in the main body portion 83 at equal intervals around the circumference of the valve body 25.

[0047] One end of the passage 62 opens between the inner seat portion 85 and the outer seat portion 86, and the other end opens between the seat portion 89 and the leg portion 37. A plurality of passages 62 are formed in the main body portion 83 at equal intervals in the circumferential direction of the valve body 25. In the radial direction of the valve body 25 , the passage 61 is located between the inner circumferential surface 81 and the passage 62 .

[0048] The body valve 30 has a disk valve 65, a disk 101, and a suppression disk 102 on the leg portion 37 side of the partition portion 36 in the axial direction, in this order from the partition portion 36 side in this axial direction. The disc valve 65 is made up of multiple discs, specifically two identically shaped discs 105. The disc 101, the suppression disc 102 and the multiple discs 105 are all made of metal and are all perforated circular flat plates, i.e., disc-shaped.

[0049] The outer diameter of the disc 105 is slightly larger than the outer diameter of the seat portion 89. The disc 105 has an inner circumferential surface 121 at the radial center that is cylindrical. In the disc valve 65, the disc 105 that is axially closest to the partition portion 36 abuts against the fixed seat portion 88 and the seat portion 89. The disc valve 65 opens and closes the passage 61 by moving the disc 105 away from and abutting against the seat portion 89.

[0050] The outer diameter of the disk 101 is smaller than the outer diameter of the disk 105. The disk 101 has an inner peripheral surface 122 at the center in the radial direction that is a cylindrical surface.

[0051] The outer diameter of the restrictor disc 102 is larger than the outer diameter of the disc 101 and slightly smaller than the outer diameter of the disc 105. The restrictor disc 102 has an inner peripheral surface 123 at the radial center thereof that is cylindrical. The restrictor disc 102 is thicker than the disc 105. The restrictor disc 102 is more rigid than the disc 105.

[0052] The body valve 30 has, in this order from the partition 36 side in the axial direction, a disk valve 66, a disk 111, and a washer 113 (restriction member) on the axial side of the partition 36 opposite the leg portion 37. The disk valve 66 and the disk 111 are both made of metal, and both have a perforated circular flat plate shape, i.e., a disk shape.

[0053] The disc valve 66 has an outer diameter slightly larger than the outer diameter of the outer seat portion 86. The disc valve 66 is formed with a passage hole 130 penetrating the disc valve 66 in the axial direction of the disc valve 66. The disc valve 66 has a plurality of passage holes 130 formed at equal intervals around the circumference of the disc valve 66. The disc valve 66 has an inner circumferential surface 131 located at the radial center of the disc valve 66 that is cylindrical. The disc valve 66 abuts against the fixed seat portion 84, the inner seat portion 85, and the outer seat portion 86. In this state, the disc valve 66 has a plurality of passage holes 130 disposed between the fixed seat portion 84 and the inner seat portion 85 in the radial direction of the disc valve 66. The disc valve 66 opens and closes the passage 62 by moving away from and abutting against the outer seat portion 86.

[0054] The outer diameter of the disc 111 is smaller than the outer diameter of the disc valve 66. The disc 111 has an inner peripheral surface 132 at the center in the radial direction that is a cylindrical surface.

[0055] The diameter of the inner peripheral surface 81 of the valve body 25, the diameter of the inner peripheral surface 121 of the disc 105, the diameter of the inner peripheral surface 122 of the disc 101, the diameter of the inner peripheral surface 123 of the suppression disc 102, the diameter of the inner peripheral surface 131 of the disc valve 66, and the diameter of the inner peripheral surface 132 of the disc 111 are all equal.

[0056] 3 and 4 show the washer 113a before it is assembled to the body valve 30 shown in Fig. 2. When assembled to the body valve 30, the washer 113a is plastically deformed to become the washer 113 shown in Fig. 2.

[0057] As shown in Fig. 3, washer 113a has a rectangular flat plate shape with holes. Washer 113a is made of metal. Washer 113a has an inner circumferential surface 133a at its center that is circular when viewed in the thickness direction of washer 113a. As shown in Fig. 4, inner circumferential surface 133a has a small diameter portion 141a, a large diameter portion 142a, and another large diameter portion 143a.

[0058] The small diameter portion 141a is provided at the center of the inner circumferential surface 133a in the thickness direction of the washer 113a. The small diameter portion 141a has a cylindrical surface. The central axis of the small diameter portion 141a is aligned with the thickness direction of the washer 113a. As shown in FIG. 5, the diameter of the small diameter portion 141a is equal to the diameter of the inner circumferential surface 81 of the valve body 25.

[0059] 4, the large diameter portion 142a expands in diameter from one end of the small diameter portion 141a in the axial direction while expanding in a direction away from the small diameter portion 141a in the axial direction. The large diameter portion 142a has a tapered surface.

[0060] The large diameter portion 143a expands in diameter from the end of the small diameter portion 141a opposite to the large diameter portion 142a in the axial direction while expanding in a direction away from the small diameter portion 141a in the axial direction. The large diameter portion 143a has a tapered surface.

[0061] The small diameter portion 141a and the large diameter portions 142a, 143a have the same central axis. This central axis is the central axis of the inner circumferential surface 133a. The inner circumferential surface 133a is located at the center in the radial direction of the washer 113a. The central axis of the inner circumferential surface 133a coincides with the central axis of the washer 113a. The axial direction of the washer 113a coincides with the thickness direction of the washer 113a. The small diameter portion 141a is located at the center in the axial direction of the washer 113a.

[0062] The washer 113a is provided on its inner periphery with a small diameter portion 141a and large diameter portions 142a and 143a which are larger in diameter than the small diameter portion 141a and are provided at different positions in the axial direction of the washer 113a from the small diameter portion 141a.

[0063] A pressing surface 151a is formed on the outer periphery of the washer 113a. The pressing surface 151a is a flat surface that extends perpendicular to the radial direction of the washer 113a. As shown in FIG. 3, the washer 113a has a plurality of pressing surfaces 151a of the same shape formed at equal intervals in the circumferential direction, specifically four pressing surfaces 151a. The four pressing surfaces 151a are at equal distances from the central axis of the washer 113a. Adjacent pressing surfaces 151a in the circumferential direction of the washer 113a are perpendicular to each other.

[0064] Washer 113a is axially mirror-symmetrical, i.e., washer 113a has the same shape even when turned axially.

[0065] 5, the washer 113a has a thickness greater than that of the disc valve 66. That is, the washer 113a is thicker than the disc valve 66. The washer 113a has a higher rigidity than the disc valve 66.

[0066] Fig. 5 shows a pin member 68a before being crimped, which is the pin member 68 shown in Fig. 2. This pin member 68a is crimped and plastically deformed to become the pin member 68 shown in Fig. 2.

[0067] 5, the pin member 68a has a shaft portion 161a and a flange portion 162. The pin member 68a is made of metal. The shaft portion 161a is cylindrical. The shaft portion 161a has an outer peripheral surface 171a that is a cylindrical surface.

[0068] Flange portion 162 extends radially outward from one axial end of shaft portion 161a. Flange portion 162 has a cylindrical outer peripheral surface. An end face 165 of flange portion 162, on the side from which shaft portion 161a extends in the axial direction, is a flat surface that extends perpendicular to the central axis of shaft portion 161a. An end face 166 of flange portion 162 opposite end face 165 in the axial direction is a flat surface that is parallel to end face 165.

[0069] In the manufacturing method for assembling the body valve 30 shown in FIG. 2, in other words, in the manufacturing method for the shock absorber 11, a shaft portion inserting step is first performed.

[0070] 5, in the shank insertion step, the shank 161a of the pin member 68a is inserted radially inwardly, in this order, into the inner circumferential surface 123 of the restrictor disc 102, the inner circumferential surface 122 of the disc 101, the inner circumferential surfaces 121 of the discs 105, the inner circumferential surface 81 of the valve body 25, the inner circumferential surface 131 of the disc valve 66, the inner circumferential surface 132 of the disc 111, and the inner circumferential surface 133a of the washer 113a. In other words, in the shank insertion step, the shank 161a of the pin member 68a is positioned on the inner peripheries of the restrictor disc 102, the disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, and the washer 113a. As a result, the suppressor disc 102, disc 101, multiple discs 105, valve body 25, disc valve 66, disc 111, and washer 113a are placed, in this order, on the end surface 165 of the flange 162. At this time, the valve body 25 is oriented so that the leg portion 37 protrudes from the partition portion 36 toward the flange 162 in the axial direction.

[0071] Next, a clamping step is performed. In the clamping process, as shown in FIG. 6 , the pin member 68a is placed on a mounting base 191 of the crimping device with the end face 166 of the flange 162 in contact. Then, multiple hook-shaped clamp members 192 of the crimping device are simultaneously brought into contact with the small-diameter outer diameter portion 31 and the large-diameter outer diameter portion 32 from the radially outer side of the valve body 25. The multiple clamp members 192 are hook-shaped to engage with the step portion 35 between the large-diameter outer diameter portion 32 and the small-diameter outer diameter portion 31 of the valve body 25. The crimping device then pulls the multiple clamp members 192 downward to clamp the valve body 25, the multiple discs 105, the disc 101, the constrainer disc 102, and the flange 162 of the pin member 68a to the mounting base 191. This state is the clamped state of the crimping device.

[0072] Next, while maintaining the clamped state, a residual axial force application step is carried out using a caulking device. In the residual axial force applying step, a cylindrical axial force applying member 193 of the crimping device presses the end face of the washer 113a axially opposite the valve body 25 toward the valve body 25. As a result, the flange 162, the restrictor disk 102, the disk 101, the plurality of disks 105, the valve body 25, the disk valve 66, the disk 111, and the washer 113a are axially clamped between the mounting table 191 and the axial force applying member 193. In other words, the crimping device applies a residual axial force to the restrictor disk 102, the disk 101, the plurality of disks 105, the valve body 25, the disk valve 66, the disk 111, and the washer 113a. This state is the residual axial force applying state of the crimping device. The shaft portion 161a of the pin member 68a is aligned with the washer 113a in the axial direction, and the portion radially facing the washer 113a forms an opposing portion 185a.

[0073] Next, while maintaining the clamped state and the state in which the residual axial tension is applied, a pressing step is performed by the caulking device. Note that this pressing step can be performed in parallel with the residual axial tension application step, in other words, simultaneously with the residual axial tension application step.

[0074] In the pressing process, pressing portions 194 of the crimping device press the washer 113a radially inward toward the shaft portion 161a of the pin member 68a. The crimping device is provided with a plurality of pressing portions 194 (specifically, four pressing portions 194, the same number as the pressing surfaces 151a) at equal intervals so as to surround the washer 113a radially outward. The four pressing portions 194 are simultaneously moved radially inward along the washer 113a and the shaft portion 161a. At this time, the washer 113a is positioned so that each pressing surface 151a extends perpendicularly to the direction of travel of the corresponding pressing portion 194. The four pressing portions 194 simultaneously press the washer 113a radially inward, plastically deforming the washer 113a and the shaft portion 161a radially inward. In other words, the washer 113a is pressed horizontally from four directions until it bites into the shaft portion 161a. This state is the pressing state of the crimping device.

[0075] The pin member 68a shown in FIGS. 5 and 6 undergoes a pressing process to become the pin member 68b shown in FIG. 7. The shaft portion 161b of the pin member 68b has a shape including an outer peripheral surface 171b and a recessed portion 172. The outer peripheral surface 171b is a cylindrical surface having the same diameter as the outer peripheral surface 171a shown in FIGS. 5 and 6 before the pressing process. The recessed portion 172 shown in FIG. 7 is formed in the pressing process. The recessed portion 172 is recessed radially inward from a middle position in the axial direction of the outer peripheral surface 171b. As a result, the outer diameter of the portion of the shaft portion 161b of the pin member 68b where the recessed portion 172 is formed is smaller than the outer diameter of the portion of the pin member 68b other than the recessed portion 172 in the axial direction. In other words, the distance from the central axis of the outer peripheral surface 171b of the shaft portion 161b of the pin member 68b to the recessed portion 172 is smaller than the radius of the outer peripheral surface 171b of the pin member 68b other than the recessed portion 172. The shaft portion 161b has a plurality of recessed portions 172, specifically four recessed portions 172, formed at intervals in the circumferential direction of the shaft portion 161b.

[0076] Washer 113a shown in Figures 5 and 6 is plastically deformed by the pressing process to become washer 113 shown in Figure 7. Inner circumferential surface 133a of washer 113 shown in Figures 5 and 6 before plastic deformation becomes inner circumferential surface 133 that fits into recessed portion 172 of shaft portion 161 after plastic deformation. After plastic deformation, washer 113 has small diameter portion 141a shown in Figures 5 and 6 become small diameter portion 141 shown in Figure 7, large diameter portion 142a shown in Figures 5 and 6 become large diameter portion 142 shown in Figure 7, and large diameter portion 143a shown in Figures 5 and 6 become large diameter portion 143 shown in Figure 7.

[0077] The small diameter portion 141 is provided at the center of the inner circumferential surface 133 in the thickness direction of the washer 113. In other words, the small diameter portion 141 is located at the center of the washer 113 in the axial direction. The distance from the radial center axis of the washer 113 to a minimum inner diameter portion 181 of the small diameter portion 141 is smallest, and is smaller than the radius of the inner circumferential surface 81 of the valve body 25 shown in FIG. 2. In the pressing process, the pressing surfaces 151a shown in FIG. 3, specifically four pressing surfaces 151a, are pressed, respectively. Therefore, the small diameter portion 141 shown in FIG. 7 has a plurality of minimum inner diameter portions 181, specifically four minimum inner diameter portions 181, spaced apart in the circumferential direction of the small diameter portion 141. In the pressing process, the minimum inner diameter portions 181 of the small diameter portion 141 of the washer 113 form the concave bottom surface 182 of the concave portion 172 of the pin member 68b. Therefore, even after the pressing step, the minimum inner diameter portion 181 of the small diameter portion 141 of the washer 113 abuts against the concave bottom surface 182.

[0078] Since the minimum inner diameter portion 181 of the small diameter portion 141 of the washer 113 abuts against the concave bottom surface 182 of the concave portion 172, the radial gap between the washer 113 and the pin member 68b at the position of the minimum inner diameter portion 181 is smaller than the radial gap between the valve body 25 and the pin member 68 shown in FIG. 2. Each of the pressing surfaces 151a of the washer 113a shown in FIGS. 3 to 6 becomes the pressing surface 151 of the washer 113 shown in FIG. 2 through the pressing process.

[0079] 7, large diameter portion 142 of washer 113 expands in diameter from one end of small diameter portion 141 in the axial direction of washer 113, and spreads away from one end in the axial direction of washer 113. Large diameter portion 142 is tapered.

[0080] Large diameter portion 143 expands in diameter from an end of small diameter portion 141 opposite large diameter portion 142 in the axial direction of washer 113, while spreading out so as to move away from it in the axial direction of washer 113. Large diameter portion 143 is tapered.

[0081] The recessed portion 172 of the shaft portion 161b is aligned with the inner circumferential surface 133 of the washer 113 in the axial direction of the shaft portion 161b and faces the inner circumferential surface 133 of the washer 113 in the radial direction. The pin member 68b has a facing portion 185b that faces the pin member 68b in the radial direction, with the axial position of the pin member 68b aligned with the washer 113. The facing portion 185b is configured by forming a recessed portion 172 shown in FIG. 7 in the facing portion 185a of the shaft portion 161a shown in FIG. 6. The pin member 68b has a recessed portion 172 in this facing portion 185b. The outer diameter of the facing portion 185b of the shaft portion 161b at the position of the recessed portion 172 is smaller than the outer diameter of the outer peripheral surface 171b of the pin member 68b at a portion other than the facing portion 185b in the axial direction of the shaft portion 161b of the pin member 68b.

[0082] In the pressing step, the recessed portion 172 may be formed in an annular shape over the entire circumference of the facing portion 185b. In this case, the small diameter portion 141 enters the recessed portion 172 over the entire circumference and abuts against the recessed bottom surface 182 of the recessed portion 172.

[0083] The washer 113 has a large diameter portion 142 provided on the opposite side of the disk 111 in the axial direction of the washer 113, and is tapered such that the diameter increases from the small diameter portion 141 toward the opposite side of the disk 111. The washer 113 also has a large diameter portion 143 provided on the disk 111 side in the axial direction of the washer 113, and is tapered such that the diameter increases from the small diameter portion 141 toward the disk 111.

[0084] The pressing step causes the washer 113a to undergo plastic deformation and become the washer 113. In the pin member 68a shown in Fig. 6, facing portion 185a, which faces radially with its axial position aligned with washer 113a, is pressed by washer 113a in the pressing step and plastically deforms radially inward to become facing portion 185b shown in Fig. 7. In the pressing step, facing portion 185b is deformed such that the diameter of concave bottom surface 182, which is the center of shaft portion 161b in the axial direction, is made smallest by small diameter portion 141 of washer 113, and the diameters on both sides of the concave bottom surface 182 in the axial direction are enlarged by large diameter portions 142, 143 of washer 113 to be larger than small diameter portion 141.

[0085] Next, while maintaining the clamped state, the residual axial force applied state, and the pressing state, a crimping process is carried out by a crimping device. In the crimping process, a crimping device uses a punch (not shown) to press and crimp the tip portion of pin member 68b that protrudes beyond washer 113 toward mounting table 191, i.e., toward flange portion 162, along the axial direction, thereby forming disc-shaped crimped portion 163 shown in FIG. 2. That is, in the crimping process, the tip portion of shaft portion 161b shown in FIG. 7 on the axial side opposite flange portion 162 shown in FIGS. 5 and 6 is plastically deformed in the axial direction, thereby expanding radially outward to form crimped portion 163 shown in FIG. 2. As a result, pin member 68b shown in FIG. 7 becomes pin member 68 shown in FIG. 2. In the crimping process, a planar abutment surface portion 178 is formed in crimped portion 163, following the shape of the end face of washer 113 on the crimped portion 163 side in the axial direction.

[0086] Here, by performing the above-described pressing step, the pin member 68b shown in Fig. 7 is in a pressed state in which the opposing portion 185b of the shaft portion 161b is pressed radially inward by the washer 113 and plastically deformed. When an axial load for crimping is applied to the pin member 68b in this pressed state in the crimping step, the material of the shaft portion 161b above the washer 113 is blocked by the washer 113 and does not easily move below the washer 113. This makes it possible to form the crimped portion 163 shown in Fig. 2 while suppressing radial expansion of the portion of the pin member 68b below the washer 113 in the axial direction.

[0087] That is, the radial expansion of the pin member 68b shown in FIG. 7 during crimping occurs because the material of the shank 161b escapes below the washer 113 through a radial gap between the washer 113 and the shank 161b of the pin member 68b. To address this, a pressing step is added in which the washer 113a shown in FIG. 6 is pressed into the shank 161a, causing the washer 113 to bite into the shank 161b as shown in FIG. 7. This makes it difficult for the material of the shank 161b to escape below the washer 113, i.e., toward the valve body 25 shown in FIG. 2, during the crimping step, which is a pressing step that follows the pressing step. This makes it possible to suppress the radial expansion of the shank 161 due to the formation of the crimped portion 163.

[0088] As described above, by performing the shank insertion process, clamping process, residual axial force application process, pressing process, and crimping process, the pin member 68 integrates the constrainer disc 102, disc 101, the multiple discs 105, the valve body 25, the disc valve 66, the disc 111, and the washer 113. As a result, the body valve 30 is assembled.

[0089] The assembled body valve 30 will be described below.

[0090] In the body valve 30, the flange 162 of the pin member 68 abuts in surface contact with the suppressor disc 102 at the end face 165, and the crimped portion 163 of the pin member 68 abuts in surface contact with the washer 113 at the abutment surface 178, thereby sandwiching the components from the suppressor disc 102 to the washer 113. In other words, in the body valve 30, the flange 162 and crimped portion 163 of the pin member 68 sandwich the suppressor disc 102, disc 101, the multiple discs 105, the valve body 25, the disc valve 66, disc 111, and the washer 113 with residual axial force applied from both axial sides. That is, the residual axial force applied to the suppressor disc 102, disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, and the washer 113 by the residual axial force application process described above remains in the body valve 30.

[0091] As shown in FIG. 8 , the pin member 68 has a shaft portion 161 having an outer peripheral surface 171 and a recessed portion 172. The outer peripheral surface 171 is a cylindrical surface having the same diameter as the outer peripheral surface 171a shown in FIGS. 5 and 6 before the pressing process and the outer peripheral surface 171b shown in FIG. 7 before the crimping process. As shown in FIG. 8 , the recessed portion 172 is recessed inward from the outer peripheral surface 171 in the radial direction of the outer peripheral surface 171. As a result, the outer diameter of the portion of the pin member 68 where the recessed portion 172 is formed is smaller than the outer diameter of the portion of the pin member 68 other than the recessed portion 172 in the axial direction. In other words, the distance from the central axis of the outer peripheral surface 171 of the shaft portion 161 to the concave bottom surface 182 of the recessed portion 172 is smaller than the radius of the outer peripheral surface 171 of the shaft portion 161 other than the recessed portion 172. The shaft portion 161 is formed with a plurality of recessed portions 172, specifically four recessed portions 172, spaced apart in the circumferential direction of the shaft portion 161.

[0092] The inner peripheral surface 133 of the washer 113 fits into and abuts against the recessed portion 172 of the shaft portion 161. The minimum inner diameter portion 181 of the small diameter portion 141 of the inner peripheral surface 133 fits into the recessed portion 172 and abuts against the recessed bottom surface 182 of the recessed portion 172. Therefore, the radial gap between the shaft portion 161 of the pin member 68 and the minimum inner diameter portion 181 of the washer 113 is smaller than the radial gap between the valve body 25 and the shaft portion 161 shown in FIG.

[0093] 8, the pin member 68 has an opposing portion 185 that faces the washer 113 in the radial direction and is positioned axially of the pin member 68. The pin member 68 has a recessed portion 172 formed in this opposing portion 185. The outer diameter of the opposing portion 185 of the pin member 68 at the position of the recessed portion 172 is smaller than the outer diameter of the pin member 68 in the axial direction other than the opposing portion 185.

[0094] The crimped portion 163 of the pin member 68 has a pressure plate portion 187 and an excess material portion 188 . The push plate portion 187 is flat and has a contact surface portion 178 . The excess material portion 188 protrudes from the radially inner side of the abutment surface portion 178 toward the large diameter portion 142 and abuts against the large diameter portion 142. The excess material portion 188 is formed by the shaft portion 161b shown in FIG. 7 protruding in a crimping process so as to fill the gap between the shaft portion 161b and the large diameter portion 142 of the washer 113.

[0095] The recessed portion 172 may be formed in an annular shape over the entire circumference of the facing portion 185. In this case, the small diameter portion 141 fits into the recessed portion 172 over the entire circumference and abuts against the recessed bottom surface 182 of the recessed portion 172.

[0096] 2, washer 113 has large diameter portion 142 provided on the crimped portion 163 side in the axial direction of washer 113, and is tapered such that its diameter increases from small diameter portion 141 toward this side. Furthermore, washer 113 has large diameter portion 143 provided on the valve body 25 side in the axial direction of washer 113, and is tapered such that its diameter increases from small diameter portion 141a toward the valve body 25 side.

[0097] The pin member 68 has a flange portion 162 that is disk-shaped and extends outward in the radial direction of the shaft portion 161 from one axial end of the shaft portion 161. An end surface 165 of the flange portion 162 is a flat surface that extends perpendicular to the central axis of the outer circumferential surface 171 of the shaft portion 161.

[0098] The pin member 68 has a crimped portion 163 provided at the end of the shaft portion 161 opposite the flange portion 162 in the axial direction. The outer diameter of the crimped portion 163 is larger than the outer diameter of the shaft portion 161. The crimped portion 163 has a contact surface 178 on the flange portion 162 side in the axial direction of the push plate portion 187, which is a flat surface that extends perpendicular to the central axis of the outer circumferential surface 171 of the shaft portion 161.

[0099] The pin member 68 has a flange portion 162 at one end in the axial direction and a crimped portion 163 at the other end. The pin member 68 has its shaft portion 161 disposed radially inward of the inner circumferential surface 123 of the suppressor disc 102, the inner circumferential surface 122 of the disc 101, the inner circumferential surfaces 121 of the plurality of discs 105, the inner circumferential surface 81 of the valve body 25, the inner circumferential surface 131 of the disc valve 66, the inner circumferential surface 132 of the disc 111, and the inner circumferential surface 133 of the washer 113. In other words, the pin member 68 is disposed on the inner peripheries of the suppressor disc 102, the disc 101, the plurality of discs 105, the partition 36 of the valve body 25, the disc valve 66, and the disc 111. Note that, at this time, the valve body 25 is oriented so that the leg portion 37 protrudes from the partition 36 in the axial direction opposite the crimped portion 163.

[0100] The pin member 68 sandwiches the restrictor disc 102, disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, and the washer 113 from both sides in the axial direction between the flange portion 162 and the crimped portion 163. This integrates the restrictor disc 102, disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, the washer 113, and the pin member 68. In other words, the pin member 68 integrates the restrictor disc 102, disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, and the washer 113 by aligning them in the axial direction of the pin member 68. At this time, the flange portion 162 of the pin member 68 abuts in surface contact with the restrictor disk 102 at the end face 165, and the crimped portion 163 abuts in surface contact with the washer 113 at the abutment surface 178.

[0101] The body valve 30 is a rivet type in which the suppressor disc 102, disc 101, multiple discs 105, valve body 25, disc valve 66, disc 111, and washer 113 are integrally connected by a pin member 68, which is a rivet. The pin member 68 clamps the suppressor disc 102, disc 101, multiple discs 105, valve body 25, disc valve 66, disc 111, and washer 113 between its flange portion 162 and crimped portion 163 while applying residual axial force to them from both sides in the stacking direction, axially integrating them.

[0102] The body valve 30 assembled as described above is fitted to one axial end of the inner cylinder 15 at the small outer diameter portion 31 of the valve body 25, as shown in FIG.

[0103] In the shock absorber 11, the rod 50 moves toward the compression side, and the piston 45 moves in a direction narrowing the second chamber 49. As a result, when the pressure in the second chamber 49 becomes higher than the pressure in the reservoir chamber 18 by a predetermined value or more, the disc valve 65 of the body valve 30 deforms such that the outer periphery thereof moves away from the valve body 25 in the axial direction. As a result, the disc valve 65 moves away from the seat portion 89 shown in FIG. 2 to open the passage 61. Then, oil L flows from the second chamber 49 shown in FIG. 1 through the passage hole 130 of the disc valve 66 and the passage 61 of the valve body 25 shown in FIG. 2 to the reservoir chamber 18 shown in FIG. 1. The restraining disc 102 shown in FIG. 2 abuts against the disc valve 65 to restrain deformation of the disc valve 65, which is provided between the disc valve 65 and the valve body 25.

[0104] In the shock absorber 11, the rod 50 shown in FIG. 1 moves in the extension direction, and the piston 45 moves toward the first chamber 48. As a result, when the pressure in the second chamber 49 drops below the pressure in the reservoir chamber 18, the disc valve 66 of the body valve 30 deforms such that the outer periphery thereof moves away from the valve body 25 in the axial direction. As a result, the disc valve 66 moves away from the outer seat portion 86 shown in FIG. 2 and opens the passage 62. Then, oil L flows from the reservoir chamber 18 shown in FIG. 1 through the passage 62 in the valve body 25 toward the second chamber 49 shown in FIG. 1. When the rod 50 moves in the extension direction, the disc valve 66 opens the passage 62, allowing oil L to flow from the reservoir chamber 18 to the second chamber 49 through the passage 62. A washer 113 shown in FIG. 2 abuts against the disc valve 66, which is provided between the disc valve 66 and the valve body 25, to suppress deformation of the disc valve 66.

[0105] Here, a plurality of disc-shaped disc valves 66 may be provided stacked in the body valve 30. In this case, the plurality of disc valves 66 serve as extension-side damping valves that generate a damping force when hydraulic fluid L flows from the reservoir chamber 18 shown in FIG. 1 to the second chamber 49 via the passage 62. In other words, it is sufficient for the body valve 30 of the shock absorber 11 to have at least one disc valve 66 that is a disc-shaped valve member.

[0106] The aforementioned Patent Documents 1 and 2 describe hydraulic shock absorbers in which a pin member having a flange on one side is inserted into a valve body and a valve member, and the other side of the pin member is crimped to integrate the valve body and the valve member. This type of crimped pin member structure may result in inconsistent damping force characteristics. Specifically, when crimped, the pin member's material moves toward the inner periphery of the valve member, deforming the valve member by pushing it radially outward. This results in variations in damping force characteristics. On the other hand, a type in which the pin member is crimped to integrate the valve body and the valve member requires fewer parts than a type in which the valve body and the valve member are integrated with bolts and nuts, offering advantages in terms of productivity and cost.

[0107] The shock absorber 11 of the first embodiment has a cylinder 17, a piston 45 provided in the cylinder 17, and a body valve 30 that divides the interior of the cylinder 17 into two chambers: a first chamber 48 and a second chamber 49. The body valve 30 includes a valve body 25, at least one disk-shaped disc valve 66, a washer 113, and a pin member 68. The valve body 25 has a passage 62. The valve member 66 opens and closes the passage 62. The washer 113 is provided on the side of the disc valve 66 opposite the valve body 25. The washer 113 is thicker than the disc valve 66. The pin member 68 is disposed on the inner periphery of the disc valve 66 and the washer 113. The pin member 68 has a flange portion 162 at one end and a crimped portion 163 at the other end. The pin member 68 integrates the valve body 25, the disc valve 66, and the washer 113 in an axially aligned manner.

[0108] In the body valve 30 of the shock absorber 11, the outer diameter of at least a part of the opposing portion 185 of the pin member 68 that faces the washer 113 is smaller than the outer diameter of the portion of the pin member 68 other than the opposing portion 185 in the axial direction.

[0109] In addition, in the body valve 30 of the shock absorber 11 , the radial gap between the washer 113 and the pin member 68 is smaller than the radial gap between the valve body 25 and the pin member 68 .

[0110] The body valve 30 of the shock absorber 11 having such a configuration can be formed by aligning the valve body 25, disc valve 66, and washer 113 in the axial direction and integrating them with the pin member 68, including a residual axial force applying process that applies residual axial force to the valve body 25 and disc valve 66, a pressing process that presses the washer 113a toward the pin member 68a before crimping, and a crimping process that forms the crimped portion 163 by crimping.

[0111] As described above, the body valve 30 of the shock absorber 11 is formed by including a pressing process in which the washer 113a is pressed toward the pin member 68a. Therefore, when the crimped portion 163 is formed on the pin member 68b in the crimping process, the washer 113 pressed toward the pin member 68b can suppress deformation of the portion of the pin member 68b closer to the disc valve 66 than the washer 113. As a result, deformation of the disc valve 66 can be suppressed. Therefore, the body valve 30 of the shock absorber 11 can obtain stable damping force characteristics without variation. In other words, because the disc valve 66 is a suction valve, the body valve 30 can obtain stable, stable characteristics in which the disc valve 66 opens without generating substantial damping force.

[0112] The body valve 30 of the shock absorber 11 is a type in which the valve body 25 and the disc valve 66 are integrated by crimping the pin member 68, so it requires fewer parts than a type in which the valve body 25 and the disc valve 66 are integrated with bolts and nuts, which is advantageous in terms of productivity and cost.

[0113] Furthermore, the body valve 30 of the shock absorber 11 is provided with a small diameter portion 141 and large diameter portions 142, 143, which are larger in diameter than the small diameter portion 141 and are provided at different axial positions from the small diameter portion 141, on the inner periphery of the washer 113. Therefore, in the pressing process, the washer 113 can effectively press the pin member 68. Therefore, deformation of the disc valve 66 can be effectively suppressed.

[0114] Furthermore, the body valve 30 of the shock absorber 11 has a small diameter portion 141 located in the center of the washer 113 in the axial direction, and a large diameter portion 142 provided on the crimped portion 163 side of the washer 113 in the axial direction, and is tapered so that the diameter increases from the small diameter portion 141 toward the crimped portion 163. This allows the washer 113a to be smoothly pushed into the pin member 68a.

[0115] Furthermore, the body valve 30 of the shock absorber 11 has a large diameter portion 143 that is provided on the valve body 25 side in the axial direction of the washer 113, and is tapered so that the diameter increases from the small diameter portion 141 toward the valve body 25. This allows the washer 113a to be smoothly pressed into the pin member 68a.

[0116] Furthermore, in the body valve 30 of the shock absorber 11, the small diameter portion 141 is located in the center of the washer 113 in the axial direction, the large diameter portion 142 is provided on the crimped portion 163 side of the washer 113 in the axial direction, and the large diameter portion 143 is provided on the valve body 25 side of the washer 113 in the axial direction. This makes it possible to form the washer 113a before deformation into a shape that remains the same even when it is turned over in the axial direction. This makes it possible to eliminate directionality when assembling the washer 113a to the pin member 68a. Therefore, it is not necessary to check the direction when assembling the washer 113a to the pin member 68a, making the assembly easier.

[0117] Here, when manufacturing the body valve 30 of the shock absorber 11, if the residual axial force applying step and the pressing step are carried out simultaneously in parallel, the time required to assemble the body valve 30 can be shortened.

[0118] The first embodiment can be modified as shown in the following first to fourth modifications.

[0119] <Variation 1> In Modification 1, instead of the hook-shaped clamp members 192 shown in Fig. 6, a plurality of rectangular plate-shaped clamp members 192A are used, as shown in Figs. 9 and 10, which move along the axial direction of the valve body 25 and abut against the step portion 35 from above. A crimping device then presses the clamp members 192A from above to clamp the valve body 25, the plurality of discs 105, the disc 101, the suppressor disc 102, and the flange portion 162 of the pin member 68a to the mounting base 191. The clamp members 192A are formed with insertion holes 201 through which a jig (not shown) that presses the pressing portion 194 is inserted. In Modification 1, the same body valve 30 as in the first embodiment is obtained after assembly.

[0120] This first modification also provides the same effects as the first embodiment.

[0121] <Variation 2> In the present modified example 2, a washer 113Ba shown in FIGS. 11 and 12 is used instead of the washer 113a.

[0122] The washer 113Ba is disk-shaped, and has a pressing groove 211 formed on its outer periphery. The pressing groove 211 extends radially inward from a cylindrical outer periphery 210 of the washer 113Ba along the radial direction. The pressing groove 211 penetrates the washer 113Ba in the axial direction. An inner end 212 of the pressing groove 211, which is on the inner side in the radial direction of the washer 113Ba, has a semi-cylindrical surface shape. The washer 113Ba has multiple pressing grooves 211 of the same shape formed at equal intervals around the circumferential direction of the washer 113Ba, specifically four positions.

[0123] The washer 113Ba is mirror-symmetrical in the axial direction. The washer 113Ba has a thickness greater than that of the disc valve 66 shown in FIG. 2. That is, the washer 113Ba is thicker than the disc valve 66. The washer 113Ba has a higher rigidity than the disc valve 66.

[0124] This washer 113Ba is also pressed radially inward by four pressing portions (not shown) of the crimping device. At that time, the four pressing portions (not shown) enter the corresponding pressing grooves 211 one-to-one and abut against the inner end portions 212 of the pressing grooves 211. Then, the four pressing portions (not shown) press the corresponding inner end portions 212 of the pressing grooves 211 one-to-one inward in the radial direction of the washer 113Ba.

[0125] Washer 113Ba also has inner circumferential surface 133a having small diameter portion 141a, large diameter portion 142a, and large diameter portion 143a. This inner circumferential surface 133a also undergoes the shank portion insertion step, clamping step, residual axial force applying step, and pressing step to become inner circumferential surface 133 having small diameter portion 141, large diameter portion 142, and large diameter portion 143. When washer 113Ba is used, recessed portion 172 is formed in opposing portion 185b of shank 161b of pin member 68b by the pressing step, and crimped portion 163 is formed in pin member 68 by the crimping step.

[0126] The washer 113Ba is disk-shaped with a cylindrical outer peripheral surface 210. Therefore, the washer formed from this washer 113Ba through the shank insertion process, clamping process, residual axial force application process, pressing process, and crimping process has a substantially disk-shaped shape, which can effectively suppress deformation of the disc valve 66.

[0127] The second modification also provides the same effects as the first embodiment.

[0128] In addition, the washer 113Ba may have three pressing grooves 211 formed at equal intervals in the circumferential direction of the washer 113Ba, or may have five or more pressing grooves 211 formed at equal intervals in the circumferential direction of the washer 113Ba.

[0129] <Variation 3> In the third modification, a washer 113Ca shown in FIGS. 13 and 14 is used instead of the washer 113a.

[0130] The washer 113Ca has a disk-shaped portion 221, a disk-shaped portion 222, and a connecting portion 223. The disk-shaped portion 221 has an outer peripheral surface 225 that is a cylindrical surface. The disk-shaped portion 222 has an outer peripheral surface 226 that is a cylindrical surface. The disk-shaped portion 221 and the disk-shaped portion 222 have the same shape.

[0131] The disk-shaped portion 221 and the disk-shaped portion 222 are arranged coaxially. In this state, the connecting portion 223 is located between the disk-shaped portion 221 and the disk-shaped portion 222 and connects these disk-shaped portions 221 and 222. A pressing surface 151Ca is formed on the outer periphery of the connecting portion 223. The pressing surface 151Ca is a flat surface that extends perpendicular to the radial direction of the disk-shaped portions 221 and 222. The washer 113Ca has a plurality of pressing surfaces 151Ca of the same shape formed at equal intervals in the circumferential direction, specifically four pressing surfaces 151Ca. The pressing surfaces 151Ca adjacent to each other in the circumferential direction of the washer 113Ca are perpendicular to each other.

[0132] The washer 113Ca is mirror-symmetrical in the axial direction. The thickness of each of the disk-shaped portions 221 and 222 of the washer 113Ca is greater than the thickness of the disc valve 66. That is, the washer 113Ca is thicker than the disc valve 66. The washer 113Ca has higher rigidity than the disc valve 66.

[0133] This washer 113Ca is also pressed radially inward by four pressing portions (not shown) of the crimping device. At this time, the four pressing portions of the crimping device each enter between the disk-shaped portion 221 and the disk-shaped portion 222 and vertically abut against the corresponding pressing surface 151Ca. The four pressing portions then press the corresponding pressing surface 151Ca radially inward of the washer 113Ca.

[0134] Washer 113Ca also has inner circumferential surface 133a having small diameter portion 141a, large diameter portion 142a, and large diameter portion 143a. After the pressing step, inner circumferential surface 133a also becomes inner circumferential surface 133 having small diameter portion 141, large diameter portion 142, and large diameter portion 143. Washer 113Ca also has recessed portion 172 formed in opposing portion 185b of shank 161b of pin member 68b through the shank insertion step, clamping step, residual axial force applying step, and pressing step, and has crimped portion 163 formed in shank 161 through the crimping step.

[0135] The washer 113Ca is disk-shaped and has cylindrical outer peripheral surfaces 225, 226. Therefore, the washer formed from this washer 113Ca through the shank insertion process, clamping process, residual axial force application process, pressing process, and crimping process has a disk shape, which can effectively suppress deformation of the disc valve 66.

[0136] The third modification also provides the same effects as the first embodiment.

[0137] In the washer 113Ca, the pressing surface 151Ca may be formed into a cylindrical surface that is coaxial with the outer circumferential surfaces 225, 226 of the disk-shaped portions 221, 222.

[0138] <Variation 4> In the fourth modification, a washer 113Da shown in FIG. 15 is used instead of the washer 113a.

[0139] The washer 113Da has an inner circumferential surface 133Da at its radial center, which is different from the inner circumferential surface 133a. The inner circumferential surface 133Da is circular when viewed in the thickness direction of the washer 113Da. The cross section of the inner circumferential surface 133Da in a plane passing through the center of this circle and extending in the thickness direction of the washer 113Da is arc-shaped, specifically semicircular. The inner circumferential surface 133Da has a small diameter portion 141Da at the center in the thickness direction of the washer 113Da. One side of the inner circumferential surface 133Da in the thickness direction of the washer 113Da is a large diameter portion 142Da. The other side of the inner circumferential surface 133Da in the thickness direction of the washer 113Da is a large diameter portion 143Da.

[0140] The diameter of the small diameter portion 141Da is equal to the diameter of the inner circumferential surface 81 of the valve body 25. The large diameter portion 142Da expands from the small diameter portion 141Da to one side in the thickness direction of the washer 113Da while increasing in diameter. The large diameter portion 142Da has a curved surface. The large diameter portion 143Da expands in diameter from the small diameter portion 141Da and spreads away from the other side in the thickness direction of the washer 113Da. The large diameter portion 143Da has a curved surface.

[0141] The small diameter portion 141Da and the large diameter portions 142Da and 143Da have the same central axis. This central axis is the central axis of the inner circumferential surface 133Da. The inner circumferential surface 133Da is located at the center in the radial direction of the washer 113Da. The central axis of the inner circumferential surface 133Da is aligned with the central axis of the washer 113Da. The axial direction of the washer 113Da is aligned with the thickness direction of the washer 113Da. The small diameter portion 141Da is located at the center in the axial direction of the washer 113Da.

[0142] The washer 113Da is provided on its inner periphery with a small diameter portion 141Da and large diameter portions 142Da and 143Da which are larger in diameter than the small diameter portion 141Da and are provided at different positions in the axial direction of the washer 113Da from the small diameter portion 141Da.

[0143] The washer 113Da is mirror-symmetrical in the axial direction. The washer 113Da has a thickness greater than that of the disc valve 66. The washer 113Da has a higher rigidity than the disc valve 66.

[0144] This washer 113Da is also pressed radially inward by the four pressing portions 194 of the crimping device. At this time, the four pressing portions 194 of the crimping device move vertically to abut against the pressing surfaces 151a that correspond to them one-to-one. Then, the four pressing portions 194 press the pressing surfaces 151a that correspond to them one-to-one inward in the radial direction of the washer 113Da.

[0145] The washer 113Da is formed in the pin member 68b by a pressing process to have a recessed portion whose cross-sectional shape in a plane including the central axis of the shaft portion 161b is different from the recessed portion 172 in the shaft portion 161b of the pin member 68b described above. This recessed portion has an arc-shaped cross-sectional shape in a plane including the central axis of the shaft portion, following the shape of the inner peripheral surface 133Da of the washer 113Da. The outer diameter of this recessed portion at the opposing portion of the shaft portion of the pin member is smaller than the outer diameter of the other portion of the pin member in the axial direction. The minimum distance from the central axis of the shaft portion of the pin member to the recessed portion is smaller than the radius of the outer peripheral surface of the pin member other than the recessed portion.

[0146] The washer formed through the shaft insertion process, clamping process, residual axial force application process, pressing process and crimping process of washer 113Da (hereinafter referred to as the washer after the crimping process) has an inner surface 133Da that enters and abuts against this recessed portion.

[0147] After the crimping process, the washer has a small diameter portion 141Da of washer 113Da, a large diameter portion 142Da of washer 113Da, and a large diameter portion 143Da of washer 113Da. The small diameter portion of the washer after the crimping process is located at the center of the inner circumferential surface in the thickness direction of the washer. After the crimping process, one large diameter portion of the washer is located on the crimped portion 163 side in the axial direction of the washer, and forms a curved surface whose diameter increases from the small diameter portion toward the one side. Furthermore, the other large diameter portion of the washer after the crimping process is located on the valve body 25 side in the axial direction of the washer, and forms a curved surface whose diameter increases from the small diameter portion toward the valve body 25 side.

[0148] After the crimping process, the minimum inner diameter portion of the small diameter portion of the washer fits into the recess of the pin member and abuts against the bottom of the recess. Therefore, the radial gap between the washer and the pin member at the position of this minimum inner diameter portion is smaller than the radial gap between the valve body 25 and the pin member.

[0149] The fourth modification also provides the same effects as the first embodiment.

[0150] The inner peripheral surface 133a of the washer 113Ba may have the same shape as the inner peripheral surface 133Da of the washer 113Da. Also, the inner peripheral surface 133a of the washer 113Ca may have the same shape as the inner peripheral surface 133Da of the washer 113Da.

[0151] [Second embodiment] Next, a second embodiment will be described, focusing on differences from the first embodiment, mainly with reference to Figures 16 and 17. Note that parts common to the first embodiment will be designated by the same names and symbols. In the second embodiment, as shown in FIG. 16, a shock absorber 11E has a body valve 30E that is partially different from the body valve 30.

[0152] The body valve 30E has a spring disc 251 on the opposite side of the disc 111 from the disc valve 66. The spring disc 251 is made of metal and includes a base plate portion 252 and a spring plate portion 253.

[0153] The substrate portion 252 is in the form of a circular flat plate with holes. An inner peripheral surface 255 of the base plate portion 252 is the inner peripheral surface of the spring disc 251. The diameter of this inner peripheral surface 255 is equal to the diameter of the inner peripheral surface 81 of the valve body 25. The spring plate portion 253 extends radially outward from the outer periphery of the substrate portion 252. The further the spring plate portion 253 is from the substrate portion 252 in the radial direction of the substrate portion 252, the further it is from the substrate portion 252 in the axial direction of the substrate portion 252.

[0154] The spring disc 251 has a plurality of spring plate portions 253 of the same shape provided at equal intervals in the circumferential direction of the base plate portion 252. The base plate portion 252 of the spring disc 251 abuts on the side of the disc 111 opposite to the disc valve 66 in the axial direction. At that time, the plurality of spring plate portions 253 of the spring disc 251 abuts on the disc valve 66.

[0155] The body valve 30E has a washer 113E (restriction member) on the opposite side of the base plate portion 252 of the spring disc 251 from the disc 111 in the axial direction. The washer 113E is made of metal and has a circular plate or disk shape with holes. The washer 113E has a base plate portion 261 and an outer peripheral plate portion 262.

[0156] The substrate portion 261 is in the shape of a circular flat plate with holes. A through-hole 265 is formed in the substrate portion 261, penetrating the substrate portion 261 in the axial direction of the substrate portion 261. A plurality of through-holes 265 are formed in the substrate portion 261 at equal intervals in the circumferential direction. In the radial direction of the substrate portion 261, the through-holes 265 are arranged outside the substrate portion 252 of the spring disc 251.

[0157] The outer peripheral plate portion 262 is annular and formed radially outside the base plate portion 261. The outer peripheral plate portion 262 is annular so as to surround the radially outside of the base plate portion 261. The outer peripheral plate portion 262 is offset to one side in the axial direction relative to the base plate portion 261. The outer peripheral plate portion 262 protrudes from the base plate portion 261 to one side in the axial direction.

[0158] 17 shows the washer 113Ea before it is assembled to the body valve 30E. When assembled to the body valve 30E, this washer 113Ea is plastically deformed to become the washer 113E.

[0159] The washer 113Ea has a base plate portion 261a and an outer peripheral plate portion 262a. The base plate portion 261a is a circular flat plate with holes. The outer peripheral plate portion 262a is annular and formed on the radially outer side of the base plate portion 261a. The outer peripheral plate portion 262a is annular so as to surround the radially outer side of the base plate portion 261a. The outer peripheral plate portion 262a is offset to one axial side with respect to the base plate portion 261a. The outer peripheral plate portion 262a protrudes from the base plate portion 261a to one axial side.

[0160] The washer 113Ea has an inner peripheral surface 133a similar to that of the washer 113a at the center of the base plate portion 261a, which is the center in the radial direction of the washer 113Ea. Of the large diameter portions 142a and 143a of the inner peripheral surface 133a, the large diameter portion 143a is disposed on the protruding side of the outer peripheral plate portion 262a in the axial direction of the washer 113Ea.

[0161] The washer 113Ea has a plurality of pressing surfaces 151a, similar to the washer 113a, on the outer periphery of the outer periphery plate portion 262a.

[0162] The washer 113Ea has a thickness greater than that of the disc valve 66. That is, the washer 113Ea is thicker than the disc valve 66. The washer 113Ea has a higher rigidity than the disc valve 66.

[0163] In the manufacturing method of the body valve 30E for assembling the body valve 30E, in other words, in the manufacturing method of the shock absorber 11E, a shaft portion inserting step is first performed.

[0164] 17, in the shaft insertion step, the shaft 161a of the pin member 68a is inserted radially inwardly, in this order, into the inner circumferential surface 123 of the restrictor disc 102, the inner circumferential surface 122 of the disc 101, the inner circumferential surfaces 121 of the discs 105, the inner circumferential surface 81 of the valve body 25, the inner circumferential surface 131 of the disc valve 66, the inner circumferential surface 132 of the disc 111, the inner circumferential surface 255 of the spring disc 251, and the inner circumferential surface 133a of the washer 113Ea. As a result, the restrictor disc 102, the disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, the spring disc 251, and the washer 113Ea are placed on the end face 165 of the flange 162 in this order. At this time, the valve body 25 is oriented so that the leg portion 37 protrudes from the partition portion 36 toward the flange portion 162 in the axial direction. Also, at this time, the spring disc 251 is oriented so that the spring plate portion 253 extends from the base portion 252 toward the disc valve 66 and abuts against the disc valve 66. Also, at this time, the washer 113Ea is oriented so that the outer peripheral plate portion 262a protrudes from the base portion 261a toward the disc valve 66 in the axial direction of the base portion 261a.

[0165] Next, a residual axial force applying step is carried out. In the residual axial force applying step, the pin member 68a is placed on the end surface 166 of the flange portion 162 on the mounting base 191 of the crimping device. In this state, a cylindrical axial force applying member 193 of the crimping device presses the end surface of the base portion 261 of the washer 113Ea, which is axially opposite the valve body 25, toward the valve body 25. As a result, the flange 162, the disc 102, the disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, the spring disc 251, and the washer 113Ea are axially clamped between the mounting base 191 and the axial force applying member 193. As a result, a residual axial force is applied to the disc 102, the disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, the disc 111, the spring disc 251, and the washer 113. This state is the residual axial force applying state of the crimping device.

[0166] Next, the pressing step is carried out while maintaining the state in which the residual axial tension is applied, or the pressing step is carried out in parallel with the residual axial tension application step. In the pressing step, the four pressing portions of the crimping device press the washer 113Ea radially inward toward the shaft portion 161a of the pin member 68a, as in the first embodiment, to plastically deform the washer 113Ea and the shaft portion 161a radially inward. As a result, the washer 113Ea becomes the washer 113E, and the pin member 68a becomes the pin member 68b.

[0167] Next, the caulking step is carried out while maintaining the state of applying the residual axial force and the state of pressure. In the crimping process, the crimping device uses a punch (not shown) to pressurize the tip of the pin member 68b that protrudes beyond the washer 113E along the axial direction toward the mounting base 191, i.e., toward the flange portion 162, thereby forming the disk-shaped crimped portion 163 shown in Figure 16. In this manner, the pin member 68a shown in FIG. 17 is made into the pin member 68 shown in FIG.

[0168] As described above, by performing the shank insertion process, residual axial force application process, pressing process, and crimping process, the pin member 68 integrates the constrainer disc 102, disc 101, the multiple discs 105, the valve body 25, the disc valve 66, disc 111, the spring disc 251, and the washer 113E. As a result, the body valve 30E is assembled.

[0169] In the assembled body valve 30E, an inner peripheral surface 133 similar to that of the washer 113 is formed on the inner periphery of the base plate portion 261 of the washer 113E. In addition, in the assembled body valve 30E, the shaft portion 161 of the pin member 68 has the same shape as in the first embodiment.

[0170] The second embodiment also provides the same effects as the first embodiment.

[0171] Here, the inner circumferential surface 133Ea of the washer 113Ea of the second embodiment can be modified in the same manner as the inner circumferential surface 133Da of the fourth modified example.

[0172] Furthermore, the washer 113Ea of the second embodiment can be modified so that its outer periphery is circular and has a plurality of pressing grooves 211, as in the above-described modified example 2. In addition, the inner periphery 133a of the washer 113Ea may have the same shape as the inner periphery 133Da of modified example 4.

[0173] The washer 113Ea of the second embodiment may have a circular outer periphery and may also have a pair of disk-shaped portions and a connecting portion connecting the pair of disk-shaped portions, as in the above-described Modification 3. In addition, the inner periphery 133a of the washer 113Ea may have the same shape as the inner periphery 133Da of Modification 4.

[0174] Although the above description has been given using the body valves 30 and 30E as examples, it is also applicable to a case where the piston 45 is integrated with the rod 50. For example, when the structure of the body valve 30 is applied to the piston 45, the mounting shaft portion 52 of the rod 50 is shaped similarly to the shaft portion 161 of the pin member 68. Then, in a shaft portion insertion step, the mounting shaft portion 52 of the rod 50 is inserted into the suppressor disc 102, disc 101, the plurality of discs 105, the valve body 25, the disc valve 66, disc 111, and the washer 113, in this order. At this time, the suppressor disc 102 is brought into contact with the end of the main shaft portion 51 on the mounting shaft portion 52 side in the axial direction. Then, in a residual axial force applying step, the washer 113 is pressed toward the main shaft portion 51 along the axial direction of the rod 50, thereby applying a residual axial force to the components from the suppressor disc 102 to the washer 113. After or in parallel with the residual axial tension applying step, a pressing step is performed in which the washer 113 is pressed radially inward toward the mounting shaft portion 52. After the residual axial tension applying step and the pressing step, a crimping step is performed in which the portion of the mounting shaft portion 52 protruding from the washer 113 is crimped to form a crimped portion. As a result, the parts from the restrainer disk 102 to the washer 113 are integrated by the end of the main shaft portion 51 on the mounting shaft portion 52 side in the axial direction and the crimped portion formed on the mounting shaft portion 52. In this case, the leg portion 37, the small-diameter outer diameter portion 31, and the large-diameter outer diameter portion 32 are removed from the valve body 25, and a sliding member is attached to the outer periphery of the valve body 25, and this sliding member is fitted into the inner periphery of the inner cylinder 15. [Industrial Applicability]

[0175] According to the above-described embodiments and various modified examples of the present invention, it is possible to provide a shock absorber, a shock absorber manufacturing method, a valve, and a valve manufacturing method that enable stable damping force characteristics to be obtained, and thus the industrial applicability is great. [Explanation of symbols]

[0176] 11, 11E... shock absorber, 17... cylinder, 18... reservoir chamber (chamber), 25... valve body, 30, 30E... body valve (valve), 45... piston, 49... second chamber (chamber), 50... rod, 62... passage (working fluid passage), 66... ​​disc valve (valve member), 68, 68a... pin member, 113, 113a, 113Ba, 113Ca, 113Da, 113E, 113Ea... washer (restriction member), 141, 141a... small diameter portion, 142, 142a, 143, 143a... large diameter portion, 162... flange portion, 163... crimped portion, 185... opposing portion.

Claims

1. A cylinder; a piston provided in the cylinder; a rod having one end connected to the piston and the other end extending from the cylinder; a body valve that divides the interior of the cylinder into two chambers; and The body valve, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; Equipped with an outer diameter of a portion of the pin member facing the restricting member is smaller than an outer diameter of a portion of the pin member other than the portion of the pin member facing the restricting member in the axial direction; buffer.

2. On the inner periphery of the restricting member, A small diameter portion; a large diameter portion having a diameter larger than that of the small diameter portion and provided at a different position in the axial direction from the small diameter portion; are provided, The shock absorber according to claim 1 .

3. the small diameter portion is located at the center of the regulating member in the axial direction, the large diameter portion is provided on the crimped portion side in the axial direction of the regulating member and has a tapered shape that increases in diameter from the small diameter portion toward the crimped portion. The shock absorber according to claim 2 .

4. the large diameter portion is provided on the valve body side of the restricting member in the axial direction and has a tapered shape that increases in diameter from the small diameter portion toward the valve body. The shock absorber according to claim 3 .

5. A cylinder; a piston provided in the cylinder; a body valve that divides the interior of the cylinder into two chambers; and The body valve, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; A manufacturing method of a shock absorber comprising: a residual axial force applying step of applying a residual axial force to the valve body and the valve member; a pressing step of pressing the regulating member toward the pin member; a crimping step of forming the crimped portion by crimping; Including, Manufacturing method of shock absorber.

6. The residual axial force applying step and the pressing step are performed simultaneously. A method for manufacturing the shock absorber according to claim 5.

7. A valve used in a shock absorber, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; Equipped with a gap between the restricting member and the pin member is smaller than a gap between the valve body and the pin member; valve.

8. Used in shock absorbers, a valve body having an actuation fluid passage; at least one disk-shaped valve member for opening and closing the hydraulic fluid passage; a restricting member that is provided on the opposite side of the valve member from the valve body and that is thicker than the valve member; a pin member that is disposed on the inner periphery of the valve member and the restricting member, has a flange portion at one end and a crimped portion at the other end, and integrates the valve body, the valve member, and the restricting member in an axially aligned manner; A method for manufacturing a valve having a residual axial force applying step of applying a residual axial force to the valve body and the valve member; a pressing step of pressing the regulating member toward the pin member; a crimping step of forming the crimped portion by crimping; Including, Valve manufacturing method.

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