shock absorber

Abstract

This shock absorber comprises: a cylinder with the inside serving as an inner chamber; a cage body that partitions the inner chamber into a first chamber and a second chamber, and has a first passage that provides communication between the first chamber and the second chamber, a first seat part that is provided so as to surround an end of the first passage on the first chamber side, a second passage that provides communication between the first chamber and the second chamber, and a second seat part that is provided so as to surround an end of the second passage on the second chamber side; a first valve that contacts the first seat part to close the first passage, and separates from the first seat part to open the first passage, and that is formed with a communication hole communicating with the second passage; a second valve that contacts the second seat part to close the second passage, and separates from the second seat part to open the second passage; and a passage adjustment disc that is provided between the first valve and the cage body and narrows the second passage.

Description

【Technical Field】 【0001】 The present invention relates to a shock absorber. This application claims priority based on U.S. Patent Application No. 18 / 139,969 filed in the United States on April 27, 2023, the content of which is incorporated herein by reference. 【Background Art】 【0002】 There is a shock absorber provided with a valve assembly having valve disks on both sides of a valve body (see, for example, Patent Document 1). By the way, in shock absorbers, there is a desire to suppress cost increases. Therefore, an object of the present invention is to provide a shock absorber capable of suppressing cost increases. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Specification of U.S. Patent No. 8,297,418 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 To achieve the above objective, one embodiment of the shock absorber of the present invention comprises: a cylinder whose inner side is an inner chamber; a cage body that divides the inner chamber into a first chamber and a second chamber, the cage body having a first passage connecting the first chamber and the second chamber; a first seat portion provided to surround the end of the first passage on the first chamber side; a second passage connecting the first chamber and the second chamber; and a second seat portion provided to surround the end of the second passage on the second chamber side; a first valve that contacts the first seat portion to close the first passage and moves away from the first seat portion to open the first passage, the first valve having a communication hole that communicates with the second passage; a second valve that contacts the second seat portion to close the second passage and moves away from the second seat portion to open the second passage; and a passage adjustment disc provided between the first valve and the cage body to narrow the second passage. [Means for solving the problem] 【0005】 A shock absorber according to one aspect of the present invention is A cylinder with the inner chamber on the inside, A cage body that divides the aforementioned interior chamber into a first chamber and a second chamber, comprising: a first passage connecting the first chamber and the second chamber; a first sheet portion provided surrounding the end of the first passage on the first chamber side; a second passage connecting the first chamber and the second chamber; and a second sheet portion provided surrounding the end of the second passage on the second chamber side; A first valve that contacts the first seat portion to close the first passage and moves away from the first seat portion to open the first passage, the first valve having a communication hole that communicates with the second passage, A second valve that contacts the second seat portion to close the second passage, and moves away from the second seat portion to open the second passage, A passage adjustment disc is provided between the first valve and the cage body to narrow the second passage, It is equipped with. [Effects of the Invention] 【0006】 According to the shock absorber of the above embodiment of the present invention, it is possible to suppress cost increases. [Brief explanation of the drawing] 【0007】 [Figure 1] This is a cross-sectional view showing a shock absorber according to a first embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the body valve assembly of a shock absorber according to a first embodiment of the present invention. [Figure 3] This is a plan view showing the cage body of a shock absorber according to a first embodiment of the present invention. [Figure 4] This is a cross-sectional perspective view showing some parts of the body valve assembly of a shock absorber according to a first embodiment of the present invention. [Figure 5] This is a perspective view showing some parts of the body valve assembly of a shock absorber according to a first embodiment of the present invention. [Figure 6] This is a plan view showing another passage adjustment disc of a shock absorber according to a first embodiment of the present invention. [Figure 7] This is a plan view showing yet another passage adjustment disc of a shock absorber according to the first embodiment of the present invention. [Figure 8] This is a plan view showing yet another passage adjustment disc of a shock absorber according to the first embodiment of the present invention. [Figure 9] This is a plan view showing a modified example 1 of the cage body of a shock absorber according to the first embodiment of the present invention. [Figure 10] This is a plan view showing the cage body of a shock absorber according to a second embodiment of the present invention. [Figure 11] This is a plan view showing the passage adjustment disc of a shock absorber according to a second embodiment of the present invention. [Figure 12] This is a plan view showing the state in which a passage adjustment disc is placed on the cage body of a shock absorber according to a second embodiment of the present invention. [Figure 13]It is a perspective view showing the cage body of the shock absorber according to the third embodiment of the present invention. [Figure 14] It is a perspective view showing the passage adjustment disk of the shock absorber according to the third embodiment of the present invention. [Figure 15] It is a perspective view showing a state in which the passage adjustment disk is placed on the cage body of the shock absorber according to the third embodiment of the present invention. [Figure 16] It is a plan view showing a state in which one passage adjustment disk is placed on the cage body of the shock absorber according to the fourth embodiment of the present invention. [Figure 17] It is a plan view showing a state in which another passage adjustment disk is placed on the cage body of the shock absorber according to the fourth embodiment of the present invention. [Figure 18] It is a plan view showing a state in which yet another passage adjustment disk is placed on the cage body of the shock absorber according to the fourth embodiment of the present invention. [Figure 19] It is a plan view showing a state in which one passage adjustment disk is placed on the cage body of the shock absorber according to the fifth embodiment of the present invention. [Figure 20] It is a plan view showing a state in which another passage adjustment disk is placed on the cage body of the shock absorber according to the fifth embodiment of the present invention. [Figure 21] It is a plan view showing a state in which yet another passage adjustment disk is placed on the cage body of the shock absorber according to the fifth embodiment of the present invention. [Figure 22] It is a cross-sectional view showing the body valve assembly of the shock absorber according to the sixth embodiment of the present invention. 【Mode for Carrying Out the Invention】 【0008】 [First Embodiment] The first embodiment will be described below with reference to FIGS. 1 to 9. 【0009】 Figure 1 shows a shock absorber 11 of the first embodiment. The shock absorber 11 is a buffer used in the suspension system of vehicles such as automobiles and railway vehicles. Specifically, the shock absorber 11 is a buffer used in the strut-type suspension of an automobile. The shock absorber 11 comprises a cylinder 17 having a tube 15 and a shell 16. The inside of the cylinder 17 is an inner chamber 18. 【0010】 The tube 15 is cylindrical. The shell 16 is a bottomed cylinder. The shell 16 has a larger diameter than the tube 15 and is located on the outer circumference of the tube 15. Therefore, the shock absorber 11 is a twin-tube type buffer. The space between the shell 16 and the tube 15 is a reservoir chamber 19, which is part of the inner chamber 18. 【0011】 The shell 16 is a single-piece molded product made of a metal component. The shell 16 has a side wall portion 21 and a bottom portion 22. The side wall portion 21 is cylindrical. The bottom portion 22 is disc-shaped and closes one end of the side wall portion 21 in the axial direction. The shell 16 has an opening 23 on the side of the side wall portion 21 opposite to the bottom portion 22. 【0012】 The shock absorber 11 includes a cage body 25 and a rod guide 26. The cage body 25 is annular in shape and is provided at one axial end of the tube 15 and rests on the bottom 22 of the shell 16. The rod guide 26 is annular in shape and is provided at the axial end of the tube 15 and the shell 16 opposite to the cage body 25. 【0013】 The cage body 25 constitutes the body valve assembly 30. The cage body 25 has a small-diameter outer diameter portion 31 and a large-diameter outer diameter portion 32 that is larger in diameter than the small-diameter outer diameter portion 31 on its outer circumference. The cage body 25 is in contact with the bottom portion 22 while being positioned radially relative to the shell 16. 【0014】 The rod guide 26 has a small-diameter outer diameter portion 33 and a large-diameter outer diameter portion 34 that is larger in diameter than the small-diameter outer diameter portion 33. The large-diameter outer diameter portion 34 of the rod guide 26 is fitted into the side wall portion 21 of the shell 16. Therefore, the rod guide 26 is positioned radially relative to the shell 16. 【0015】 One axial end of the tube 15 is fitted into the small-diameter outer diameter portion 31 of the cage body 25. The other axial end of the tube 15 is fitted into the small-diameter outer diameter portion 33 of the rod guide 26. As a result, the tube 15 is positioned radially relative to the shell 16. 【0016】 The cage body 25 has a compartment 35 and a leg portion 36. The partitioned portion 35 is in the shape of a perforated disc. The partitioned portion 35 has a portion on the axial side of the large-diameter outer diameter portion 32 that faces the small-diameter outer diameter portion 31, and the small-diameter outer diameter portion 31 itself. 【0017】 The leg portion 36 protrudes from the outer circumference of the compartment portion 35 along the axial direction of the compartment portion 35. The leg portion 36 is annular in shape. The leg portion 36 has a portion formed on the side of the large diameter outer diameter portion 32 that is opposite to the small diameter outer diameter portion 31 in the axial direction. The leg portion 36 has a passage groove 38 formed on the side of the leg portion 36 that is opposite to the compartment portion 35 in the axial direction. The passage groove 38 penetrates the leg portion 36 in the radial direction of the leg portion 36. Multiple passage grooves 38 of the same shape are provided on the leg portion 36 at equal intervals in the circumferential direction. 【0018】 The cage body 25 has legs 36 that contact the bottom 22 of the shell 16. The space between the cage body 25 and the bottom 22 of the shell 16 is connected to the space between the tube 15 and the side wall 21 of the shell 16 via a passage groove 38. As a result, the space between the cage body 25 and the bottom 22 forms a reservoir chamber 19, similar to the space between the tube 15 and the shell 16. The reservoir chamber 19 consists of a cylindrical chamber 41 between the tube 15 and the side wall 21 of the shell 16, and a bottom chamber 42 (second chamber) between the cage body 25 and the bottom 22. 【0019】 The shock absorber 11 has a sealing member 39. The sealing member 39 is annular in shape and is located on the side opposite the bottom 22 of the rod guide 26. The sealing member 39 is fitted to the inner circumference of the side wall portion 21 of the shell 16. A locking portion 40 is formed at the end of the side wall portion 21 opposite the bottom 22 in the axial direction. The locking portion 40 is formed by plastically deforming the cylindrical side wall portion 21 radially inward by crimping, such as curling. The sealing member 39 is sandwiched between this locking portion 40 and the rod guide 26. The sealing member 39 closes the opening 23 of the shell 16 and is specifically an oil seal. 【0020】 The shock absorber 11 includes a piston assembly 44. The piston assembly 44 is located inside the tube 15 of the cylinder 17. The piston assembly 44 includes a piston 45. The piston 45 is slidably fitted inside the tube 15. The piston 45 divides the inside of the tube 15 into two chambers: an upper chamber 48 and a lower chamber 49 (first chamber). The upper chamber 48 and the lower chamber 49, together with the reservoir chamber 19, constitute the inner chamber 18 inside the cylinder 17. The upper chamber 48 is located between the piston 45 inside the tube 15 and the rod guide 26. The lower chamber 49 is located between the piston 45 inside the tube 15 and the cage body 25. The lower chamber 49 is defined by the cage body 25 as the reservoir chamber 19. In other words, the cage body 25 divides the inner chamber 18 within the cylinder 17 into a lower chamber 49 and a bottom chamber 42 of the reservoir chamber 19. 【0021】 The cylinder 17 is filled with oil liquid L as a working fluid in its upper chamber 48 and lower chamber 49. Additionally, the cylinder 17 is filled with gas G and oil liquid L as working fluids in its reservoir chamber 19. 【0022】 The shock absorber 11 has a rod 50. The rod 50 has a main shaft portion 51 and a mounting shaft portion 52. The mounting shaft portion 52 has an outer diameter 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. 【0023】 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 outward from the shell 16 of the cylinder 17 through an opening 23. A piston assembly 44, including the piston 45, is connected to the mounting shaft portion 52 of the rod 50 by a nut 53. The main shaft portion 51 of the rod 50 extends outward from the tube 15 and shell 16 through a rod guide 26 and a sealing member 39. The main shaft portion 51 of the rod 50 is guided by the rod guide 26 and moves axially in conjunction with the piston 45 relative to the tube 15 and shell 16. The sealing member 39 closes the space between the opening 23 of the shell 16 and the rod 50, restricting the leakage of the oil liquid L in the tube 15 and the gas G and oil liquid L in the reservoir chamber 19 to the outside. 【0024】 The shock absorber 11 has a portion of the rod 50 extending from the cylinder 17 positioned at the top and connected to the vehicle body. At the same time, the side wall portion 21 of the shell 16 of the shock absorber 11 is positioned at the bottom and connected to the vehicle's wheel. 【0025】 The piston 45 has passages 55 and 56 that penetrate it axially. Passages 55 and 56 allow communication between the upper chamber 48 and the lower chamber 49. Passages 55 and 56 are passages through which the oil liquid L flows. 【0026】 The piston assembly 44 includes a disc valve 57 and a disc valve 58. The disc valve 57 is annular in shape and is located on the side of the piston 45 opposite the bottom 22 in the axial direction. The disc valve 57 closes the passage 55 by contacting the piston 45. The passage 55 is normally open to the lower chamber 49. 【0027】 The disc valve 58 is annular in shape and is located on the bottom 22 side in the axial direction of the piston 45. The disc valve 58 closes the passage 56 by contacting the piston 45. The passage 56 is normally open to the upper 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. 【0028】 The direction in which the rod 50 increases its penetration into the tube 15 and shell 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 pressure in the lower chamber 49 becomes higher than the pressure in the upper chamber 48 by a predetermined value during the compression stroke, when the rod 50 moves to the compression side and the piston 45 moves in a direction that narrows the lower chamber 49. As a result, the oil L in the lower chamber 49 flows to the upper chamber 48 through the passage 55. The disc valve 57 is a damping valve that generates damping force at that 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 the lower chamber 49 and the upper chamber 48 to communicate through the passage 55 even when the disc valve 57 is in its most closed state. 【0029】 The extension side, which increases the overall length of the shock absorber 11, is the direction in which the rod 50 protrudes more from the tube 15 and shell 16, i.e., from the cylinder 17. The disc valve 58 opens the passage 56 when the pressure in the upper chamber 48 becomes higher than the pressure in the lower chamber 49 by a predetermined value during the extension stroke in which the rod 50 moves in the extension side and the piston 45 moves in the direction that narrows the upper chamber 48. As a result, the oil L in the upper chamber 48 flows to the lower chamber 49 through the passage 56. The disc valve 58 is a damping valve that generates a damping force at that 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 the upper chamber 48 and the lower chamber 49 to communicate through the passage 56 even when the disc valve 58 is in its most closed state. 【0030】 As shown in Figure 2, the cage body 25 has a first passage 61 and a second passage 62 at the location of the compartment 35. Both the first passage 61 and the second passage 62 penetrate the compartment 35 in the axial direction of the compartment 35. The first passage 61 and the second passage 62 are able to communicate with the lower chamber 49 and the bottom chamber 42 of the reservoir chamber 19. Oil liquid L flows through the first passage 61 and the second passage 62. The first passage 61 is located on the outside of the second passage 62 in the radial direction of the cage body 25. 【0031】 The first passage 61 has a first passage hole 71 and a first annular groove 72. As shown in Figure 3, the first passage 61 has multiple, specifically four, first passage holes 71. The multiple first passage holes 71 are all identical in shape and are elongated holes that are long in the circumferential direction of the cage body 25. The multiple first passage holes 71 all extend in the axial direction of the cage body 25. The multiple first passage holes 71 are aligned in the radial direction of the cage body 25 and arranged at equal intervals in the circumferential direction of the cage body 25. 【0032】 As shown in Figure 2, the first annular groove 72 is provided at the lower chamber 49 side end of the multiple first passage holes 71 and extends in the circumferential direction of the cage body 25 so as to connect the multiple first passage holes 71. Therefore, the first annular groove 72 is annular and connects the lower chamber 49 side ends of the multiple first passage holes 71. The multiple first passage holes 71 open to the bottom surface of the first annular groove 72. 【0033】 The cage body 25 has an outer sheet portion 74 (first sheet portion) and an inner sheet portion 75 (first sheet portion). 【0034】 The outer sheet portion 74 is annular in shape and protrudes from the bottom surface of the first annular groove 72 toward the lower chamber 49 in the axial direction of the cage body 25. The outer sheet portion 74 surrounds the radial outer side of the first annular groove 72 of the cage body 25. Therefore, the outer sheet portion 74 is provided surrounding the end of the first passage 61 toward the lower chamber 49 on the radial outer side of the cage body 25. 【0035】 The inner sheet portion 75 is located inside the outer sheet portion 74 in the radial direction of the cage body 25, and is separated from the outer sheet portion 74. The inner sheet portion 75 is annular in shape and protrudes from the bottom surface of the first annular groove 72 toward the lower chamber 49 in the axial direction of the cage body 25. The inner sheet portion 75 is located coaxially with the outer sheet portion 74. The inner sheet portion 75 surrounds the inside of the first annular groove 72 in the radial direction of the cage body 25. Therefore, the inner sheet portion 75 surrounds the end of the first passage 61 toward the lower chamber 49 on the inside of the cage body 25 in the radial direction. The outer sheet portion 74 and the inner sheet portion 75 are aligned in the position of their ends toward the lower chamber 49 in the axial direction of the cage body 25. 【0036】 The second passage 62 has a second passage hole 81, a second annular groove 82, and a third annular groove 83. As shown in Figure 3, the second passage 62 has multiple, specifically eight, second passage holes 81. The multiple second passage holes 81 are all circular holes of the same shape and all extend in the axial direction of the cage body 25. The multiple second passage holes 81 are aligned in the radial direction of the cage body 25 and arranged at equal intervals in the circumferential direction of the cage body 25. 【0037】 As shown in Figure 2, the second annular groove 82 is provided at the bottom chamber 42-side ends of the multiple second passage holes 81 and extends in the circumferential direction of the cage body 25 so as to connect the multiple second passage holes 81. Therefore, the second annular groove 82 is annular and connects the bottom chamber 42-side ends of the multiple second passage holes 81. The second annular groove 82 is located radially inward of the cage body 25 than the first passage hole 71. The second passage holes 81 open to the bottom surface of the second annular groove 82. 【0038】 The cage body 25 has a seat portion 85 (second seat portion) and a fixed seat portion 86. The sheet portion 85 is annular in shape and protrudes from the bottom surface of the second annular groove 82 toward the bottom chamber 42 in the axial direction of the cage body 25. The sheet portion 85 surrounds the radially outer side of the second annular groove 82 of the cage body 25. Therefore, the sheet portion 85 is provided surrounding the bottom chamber 42 side end of the second passage 62 on the radially outer side of the cage body 25. 【0039】 The fixed sheet portion 86 is provided inward of the sheet portion 85 in the radial direction of the cage body 25, and is separated from the sheet portion 85. The fixed sheet portion 86 is annular in shape and protrudes from the bottom surface of the second annular groove 82 toward the bottom chamber 42 in the axial direction of the cage body 25. The fixed sheet portion 86 is provided coaxially with the sheet portion 85. The fixed sheet portion 86 surrounds the inside of the second annular groove 82 in the radial direction of the cage body 25. Therefore, the fixed sheet portion 86 surrounds the bottom chamber 42 side end of the second passage 62 on the inside of the cage body 25 in the radial direction. In the axial direction of the cage body 25, the position of the bottom chamber 42 side end of the fixed sheet portion 86 is located closer to the lower chamber 49 than the position of the bottom chamber 42 side end of the sheet portion 85 in the axial direction of the cage body 25. 【0040】 The third annular groove 83 is provided at the lower chamber 49-side ends of the multiple second passage holes 81 and extends circumferentially around the cage body 25, connecting the multiple second passage holes 81. Therefore, the third annular groove 83 is annular and connects the lower chamber 49-side ends of the multiple second passage holes 81. The entire third annular groove 83 is located radially inward of the cage body 25 compared to the first annular groove 72. The second passage holes 81 open to the bottom surface of the third annular groove 83. 【0041】 The cage body 25 has a land portion 91 and a fixing sheet portion 92. The land portion 91 is annular and is located radially inside the cage body 25 of the inner sheet portion 75. The land portion 91 protrudes from the bottom surface of the third annular groove 83 toward the lower chamber 49 in the axial direction of the cage body 25. The land portion 91 surrounds the radial outside of the cage body 25 of the third annular groove 83. Therefore, the land portion 91 is provided surrounding the end of the second passage 62 toward the lower chamber 49 on the radial outside of the cage body 25. The land portion 91 is located radially inside the inner sheet portion 75 and is coaxial with the inner sheet portion 75. The position of the end of the land portion 91 toward the lower chamber 49 in the axial direction of the cage body 25 is located toward the bottom chamber 42 side than the position of the end of the inner sheet portion 75 toward the lower chamber 49 in the axial direction of the cage body 25. The land portion 91 is continuous and adjacent to the inner sheet portion 75 in the radial direction of the cage body 25. 【0042】 The fixing sheet portion 92 is provided inward of the land portion 91 in the radial direction of the cage body 25, and at a distance from the land portion 91. The fixing sheet portion 92 is annular and protrudes from the bottom surface of the third annular groove 83 toward the lower chamber 49 in the axial direction of the cage body 25. The fixing sheet portion 92 is provided coaxially with the land portion 91. The fixing sheet portion 92 surrounds the radially inner side of the third annular groove 83 of the cage body 25. Therefore, the fixing sheet portion 92 surrounds the end of the second passage 62 toward the lower chamber 49 on the radially inner side of the cage body 25. The fixing sheet portion 92 and the land portion 91 are aligned in the axial direction of the end of the cage body 25 toward the lower chamber 49. 【0043】 The body valve assembly 30 has a passage adjustment disc 101, a first height adjustment disc 102, a first valve 103, a first small diameter disc 104, and a first washer 105 on the lower chamber 49 side in the axial direction of the cage body 25. The body valve assembly 30 also has a second height adjustment disc 106, a second valve 107, a second small diameter disc 108, and a second washer 109 on the bottom chamber 42 side in the axial direction of the cage body 25. The second height adjustment disc 106, the second valve 107, the second small diameter disc 108, and the second washer 109 are all located inside the radial leg portion 36 of the cage body 25. 【0044】 The body valve assembly 30 has a pin member 110 for attaching the passage adjustment disc 101, first height adjustment disc 102, first valve 103, first small diameter disc 104, first washer 105, second height adjustment disc 106, second valve 107, second small diameter disc 108, and second washer 109 to the cage body 25. 【0045】 The passage adjustment disc 101, the first height adjustment disc 102, the first valve 103, the first small diameter disc 104, the first washer 105, the second height adjustment disc 106, the second valve 107, the second small diameter disc 108, the second washer 109, and the pin member 110 are all made of metal. 【0046】 The passage adjustment disc 101, the first height adjustment disc 102, the first valve 103, the first small diameter disc 104, the second height adjustment disc 106, the second valve 107, the second small diameter disc 108, and the second washer 109 are all formed by stamping out sheet metal using a press. 【0047】 The pin member 110 has a support portion 111, a shaft portion 112, and a flange portion 123. The support portion 111 is disc-shaped. The shaft portion 112 is cylindrical, with an outer diameter smaller than the outer diameter of the support portion 111. The shaft portion 112 extends from one end of the support portion 111 in the axial direction along the axial direction of the support portion 111. The flange portion 113 extends radially outward from the end of the shaft portion 112 opposite to the support portion 111 in the axial direction. 【0048】 The passage adjustment disc 101, the first height adjustment disc 102, the first valve 103, the first small diameter disc 104, the first washer 105, the second height adjustment disc 106, the second valve 107, the second small diameter disc 108, and the second washer 109 are all annular and flat in shape. 【0049】 The cage body 25, passage adjustment disc 101, first height adjustment disc 102, first valve 103, first small diameter disc 104, first washer 105, second height adjustment disc 106, second valve 107, second small diameter disc 108, and second washer 109 all have the shaft portion 112 of the pin member 110 fitted radially inward. 【0050】 Here, the pin member 110 is in a state before the cage body 25, passage adjustment disc 101, first height adjustment disc 102, first valve 103, first small diameter disc 104, first washer 105, second height adjustment disc 106, second valve 107, second small diameter disc 108, and second washer 109 are attached, and the shaft portion 112 does not have a flange portion 113 formed on it. Then, while fitting the shaft portion 112 of the pin member 110 in this state before the flange portion 113 is formed into each of the components, the second washer 109, second small diameter disc 108, second valve 107, second height adjustment disc 106, cage body 25, passage adjustment disc 101, first height adjustment disc 102, first valve 103, first small diameter disc 104, and first washer 105 are placed on the support portion 111 of the pin member 110 in this order. In this state, a flange portion 113 is formed on the shaft portion 112 of the pin member 110 by crimping. As a result, the second washer 109, second small-diameter disc 108, second valve 107, second height adjustment disc 106, cage body 25, passage adjustment disc 101, first height adjustment disc 102, first valve 103, first small-diameter disc 104, and first washer 105 are clamped axially by being held between the support portion 111 and the flange portion 113, at least on the inner circumference side of each. 【0051】 The passage adjustment disc 101 has an outer diameter larger than the diameter of the radial outer end of the third annular groove 83, and as shown in Figure 4, it is in contact with the land portion 91 and the fixed sheet portion 92 of the cage body 25. The outer circumference of the passage adjustment disc 101 is in contact with the land portion 91 of the cage body 25 around its entire circumference, and the inner circumference is in contact with the fixed sheet portion 92 around its entire circumference. In other words, the passage adjustment disc 101 covers the end of the second passage 62 on the lower chamber 49 side. 【0052】 The passage adjustment disc 101 has multiple through holes 131 that penetrate axially between its inner and outer circumferences, specifically eight through holes as shown in Figure 5. The through holes 131 are circular holes of the same shape. The multiple through holes 131 are aligned radially with the passage adjustment disc 101 and arranged at equal intervals in the circumferential direction of the passage adjustment disc 101. As shown in Figure 2, the multiple through holes 131 of the passage adjustment disc 101 are located between the portion of the cage body 25 that contacts the land portion 91 and the portion that contacts the fixed sheet portion 92 in the radial direction. In other words, the multiple through holes 131 are located within the range of the third annular groove 83 of the second passage 62 in the radial direction of the cage body 25. 【0053】 The first height adjustment disc 102 has an outer diameter smaller than the diameter of the radial inner end of the third annular groove 83 and is in contact with the passage adjustment disc 101. Therefore, the first height adjustment disc 102 does not cover the multiple through holes 131 of the passage adjustment disc 101. The passage chamber 132 between the radial inner seat portion 75 of the cage body 25 and the first height adjustment disc 102 communicates with the second passage 62 via the passages in the multiple through holes 131. The passage adjustment disc 101 is provided in this passage chamber 132. 【0054】 The first valve 103 is a disc valve consisting of a single disc. The outer diameter of the first valve 103 is slightly larger than the outer diameter of the outer seat portion 74 of the cage body 25. The first valve 103 is in contact with the outer seat portion 74 and the inner seat portion 75 of the cage body 25 and the first height adjustment disc 102. The outer circumference of the first valve 103 is in contact with the outer seat portion 74 of the cage body 25 around its entire circumference, the radial middle portion is in contact with the inner seat portion 75 around its entire circumference, and the inner circumference is in contact with the first height adjustment disc 102 around its entire circumference. The first valve 103 is in contact with the outer seat portion 74 and the inner seat portion 75 to close the first passage 61, and is at least away from the outer seat portion 74 to open the first passage 61. The first passage 61 is always in communication with the bottom chamber 42, and therefore, when the first valve 103 opens, the first passage 61 connects the bottom chamber 42 and the lower chamber 49. The first passage 61 is an extension-side passage through which the oil liquid L flows during the extension stroke in which the piston 45 and rod 50 move toward the extension side, as shown in Figure 1. 【0055】 Here, regarding the first height adjustment disc 102 shown in Figure 2, by selecting one from a plurality of first height adjustment discs 102 with different axial thicknesses, the axial thickness is adjusted, thereby adjusting the spring force generated when it contacts the outer seat portion 74 and inner seat portion 75 of the first valve 103, and thus adjusting the valve opening pressure. In other words, if the thickness of the first height adjustment disc 102 is reduced, the spring force when it contacts the outer seat portion 74 and inner seat portion 75 of the first valve 103 increases, the valve opening pressure of the first valve 103 increases, and the damping force generated when the valve opens increases. 【0056】 The first valve 103 has multiple, specifically three, communication holes 135 formed between its inner and outer circumferences, penetrating axially. These communication holes 135 are all identical in shape and are elongated holes that are long in the circumferential direction of the first valve 103. The communication holes 135 are aligned radially with the first valve 103 and are arranged at equal intervals in the circumferential direction of the first valve 103. As shown in Figure 2, the communication holes 135 of the first valve 103 are located between the portion that contacts the inner seat portion 75 of the cage body 25 and the portion that contacts the first height adjustment disc 102. In other words, the communication holes 135 are located within the range of the passage chamber 132 in the radial direction of the cage body 25. The communication holes 135 are constantly in communication with the second passage 62 via the passage chamber 132 and the passages within the multiple through holes 131 of the passage adjustment disc 101. The passage adjustment disc 101 is provided between the first valve 103 and the cage body 25. 【0057】 The first small-diameter disc 104 is in contact with the first valve 103. The outer diameter of the first small-diameter disc 104 is smaller than the diameter of the inscribed circles of the multiple communication holes 135 of the first valve 103. Therefore, the first small-diameter disc 104 does not cover the passages within the multiple communication holes 135. 【0058】 The first washer 105 is in contact with the first small-diameter disc 104 and the flange portion 113 of the pin member 110. The outer diameter of the first washer 105 is larger than the outer diameter of the first small-diameter disc 104 and larger than the outer diameter of the flange portion 113. The outer diameter of the first washer 105 is smaller than the inner diameter of the inner seat portion 75 of the cage body 25. 【0059】 The second height adjustment disc 106 is in contact with the fixed seat portion 86 of the cage body 25. The outer diameter of the second height adjustment disc 106 is smaller than the diameter of the inscribed circles of the plurality of second passage holes 81. Therefore, the second height adjustment disc 106 does not cover the plurality of second passage holes 81. The space between the second height adjustment disc 106 and the seat portion 85 of the cage body 25 in the radial direction is part of the second passage 62. 【0060】 The second valve 107 is a disc valve consisting of a single disc. The outer diameter of the second valve 107 is slightly larger than the outer diameter of the seat portion 85 of the cage body 25. The second valve 107 is in contact with the seat portion 85 of the cage body 25 and the second height adjustment disc 106. The outer circumference of the second valve 107 is in contact with the seat portion 85 of the cage body 25 around its entire circumference, and the inner circumference is in contact with the second height adjustment disc 106 around its entire circumference. The second valve 107 closes the second passage 62 by contacting the seat portion 85 and opens the second passage 62 by moving away from the seat portion 85. 【0061】 The second passage 62 provided in the cage body 25, the passages in the multiple through holes 131 provided in the passage adjustment disc 101, the passage chamber 132, and the passages in the multiple communication holes 135 provided in the first valve 103 constitute the compression-side passage 140 shown in Figure 2, through which the oil liquid L flows during the compression stroke in which the piston 45 and rod 50 shown in Figure 1 move toward the compression side. One end of the compression-side passage 140 is always in communication with the lower chamber 49, and the other end is opened and closed by the second valve 107. When the second valve 107 is opened, the compression-side passage 140, including the second passage 62, connects the lower chamber 49 and the bottom chamber 42. 【0062】 Here, with respect to the second height adjustment disc 106, by selecting one from a plurality of second height adjustment discs 106 with different axial thicknesses, the axial thickness is adjusted, thereby adjusting the spring force generated when the second valve 107 contacts the seat portion 85, and thus adjusting the valve opening pressure. In other words, if the thickness of the second height adjustment disc 106 is reduced, the spring force when the second valve 107 contacts the seat portion 85 increases, the valve opening pressure of the second valve 107 increases, and the damping force generated when the valve opens increases. 【0063】 The second small-diameter disc 108 is in contact with the second valve 107. The outer diameter of the second small-diameter disc 108 is smaller than the outer diameter of the second height adjustment disc 106. 【0064】 The second washer 109 is in contact with the second small-diameter disc 108 and the support portion 111 of the pin member 110. The outer diameter of the second washer 109 is larger than the outer diameter of the second small-diameter disc 108 and larger than the outer diameter of the support portion 111. The outer diameter of the second washer 109 is smaller than the inner diameter of the seat portion 85 of the cage body 25. 【0065】 Here, in the retraction-side passage 140, which includes the second passage 62 provided in the cage body 25, the passages in the multiple through holes 131 provided in the passage adjustment disc 101, the passage chamber 132, and the passages in the multiple communication holes 135 provided in the first valve 103, the passages in the multiple through holes 131 provided in the passage adjustment disc 101 have the smallest flow area. Therefore, the passages in the multiple through holes 131 of the passage adjustment disc 101 narrow the second passage 62, as well as the passages in the passage chamber 132 and the passages in the multiple communication holes 135. 【0066】 In the shock absorber 11, the rod 50 shown in Figure 1 moves to the compression side, and the piston 45 moves in a direction that narrows the lower chamber 49. As a result, when the pressure in the lower chamber 49 becomes higher than the pressure in the reservoir chamber 19 by a predetermined value or more, the body valve assembly 30 shown in Figure 2 deforms such that the second valve 107 moves its outer circumference axially away from the cage body 25. Consequently, the second valve 107 moves away from the seat portion 85 and opens the compression-side passage 140, which includes the second passage 62. Then, the oil L flows from the lower chamber 49 through the compression-side passage 140, that is, through the passages in the multiple communication holes 135 provided in the first valve 103, the passage chamber 132, the passages in the multiple through holes 131 provided in the passage adjustment disc 101, and the second passage 62 provided in the cage body 25, to the bottom chamber 42 of the reservoir chamber 19. The second valve 107 is a damping valve that generates a damping force when it opens in this manner and allows the oil liquid L to flow from the lower chamber 49 into the bottom chamber 42 of the reservoir chamber 19. The second washer 109 is provided between the cage body 25 and the second valve 107, and suppresses deformation of the second valve 107 by contacting the second valve 107. 【0067】 In the shock absorber 11, the rod 50 shown in Figure 1 moves in the extension direction, and the piston 45 moves towards the upper chamber 48. As a result, when the pressure in the lower chamber 49 falls below the pressure in the reservoir chamber 19, the body valve assembly 30 shown in Figure 2 deforms such that the first valve 103 moves axially away from the outer circumference of the cage body 25. Consequently, the first valve 103 moves away from at least the outer seat portion 74, opening the first passage 61. Then, the oil liquid L flows from the bottom chamber 42 of the reservoir chamber 19 through the first passage 61 of the cage body 25 towards the lower chamber 49. The first valve 103 opens the first passage 61 when the rod 50 moves in the extension direction, allowing the oil liquid L to flow from the reservoir chamber 19 to the lower chamber 49 through the first passage 61. The first valve 103 is a suction valve that, when opened, allows oil liquid L to flow from the bottom chamber 42 of the reservoir chamber 19 into the lower chamber 49, and in this manner, does not substantially generate a damping force. Alternatively, the first valve 103 may be a damping valve that generates a damping force when opened, allowing oil liquid L to flow from the reservoir chamber 19 into the lower chamber 49. The first washer 105, which is provided between the first valve 103 and the cage body 25, contacts the first valve 103 to suppress deformation of the first valve 103. 【0068】 As shown in Figure 1, a locking member 141 is fixed to the rod 50 at a position between the piston assembly 44 of the main shaft portion 51 and the rod guide 26. A cushioning member 142 is provided on the rod 50 between the locking member 141 and the rod guide 26. The cushioning member 142 is in contact with the locking member 141. When the rod 50 is in the fully extended position on the extension side, the rod guide 26 restricts the locking member 141 from moving any further in the extension side. At that time, the cushioning member 142 contacts the rod guide 26 to mitigate the impact. 【0069】 Patent Document 1 discloses a shock absorber equipped with a valve assembly having valve discs on both sides of a valve body. In this type of shock absorber, the flow area of ​​the passage in the valve body may be changed in order to change the valve opening characteristics of the valve disc of the valve assembly. In order to change the flow area of ​​the passage in the valve body, a valve body having that flow area is required. For this reason, in order to prepare multiple types of valve assemblies with different valve opening characteristics of the valve disc, it is necessary to prepare multiple types of valve bodies, which increases costs. 【0070】 The shock absorber 11 of the first embodiment has a cage body 25 that divides the inner chamber 18 of the cylinder 17 into a lower chamber 49 and a bottom chamber 42, which includes a first passage 61 that connects the lower chamber 49 and the bottom chamber 42, an outer seat portion 74 and an inner seat portion 75 provided surrounding the end of the first passage 61 on the lower chamber 49 side, a second passage 62 that connects the lower chamber 49 and the bottom chamber 42, and a seat portion 85 provided surrounding the end of the second passage 62 on the bottom chamber 42 side. Furthermore, the shock absorber 11 includes a first valve 103 that contacts the outer seat portion 74 and the inner seat portion 75 to close the first passage 61, opens the first passage 61 away from at least the outer seat portion 74, and has a communication hole 135 that communicates with the second passage 62, and a second valve 107 that contacts the seat portion 85 to close the second passage 62, opens the second passage 62 away from the seat portion 85. 【0071】 Furthermore, the shock absorber 11 is provided with a passage adjustment disc 101 that narrows the second passage 62 between the first valve 103 and the cage body 25. Therefore, even when the shock absorber 11 changes the flow area of ​​the compression-side passage 140 of the cage body 25 in order to change the opening characteristics of the second valve 107, it is sufficient to change only the relatively inexpensive passage adjustment disc 101 without changing the flow area of ​​the second passage 62 of the cage body 25. Thus, by providing multiple types of relatively inexpensive passage adjustment discs 101 for one type of cage body 25, the flow area of ​​the compression-side passage 140 can be changed. For this reason, by providing multiple types of passage adjustment discs 101 for one type of cage body 25, multiple types of body valve assemblies 30 with different opening characteristics of the second valve 107 can be provided. Thus, an increase in the number of types of cage bodies 25 can be suppressed, and an increase in the manufacturing and management costs of the cage body 25 can be suppressed. Consequently, it is possible to suppress the cost increase of the shock absorber 11. 【0072】 Furthermore, since the shock absorber 11 has an annular passage adjustment disc 101 with through holes 131 that penetrate axially between the inner and outer circumferences, the flow area of ​​the compression-side passage 140 can be changed by preparing multiple types of passage adjustment discs with different through holes 131. However, in all cases, the passage adjustment disc is set to narrow the second passage 62. For example, for a passage adjustment disc 101 having eight through holes 131 as shown in Figure 5, a passage adjustment disc 101a having 12 through holes 131a with a smaller inner diameter than the through holes 131, as shown in Figure 6, can be prepared, or for a passage adjustment disc 101a having 12 through holes 131a, as shown in Figure 7, a passage adjustment disc 101a having 12 through holes 131b with a smaller inner diameter than the through holes 131a, the same number as the through holes 131a of the passage adjustment disc 101a can be prepared. Multiple types of passage adjustment discs are prepared, each having the same outer diameter and inner diameter, but differing in at least one of the number of through holes and the inner diameter of the through holes. For example, a disc 101b is prepared, or, in contrast to the passage adjustment disc 101a shown in Figure 6 which has 12 through holes 131a, a passage adjustment disc 101c is prepared which has 4 through holes 131a of the same inner diameter as the passage adjustment disc 101a, as shown in Figure 8. In this way, multiple types of passage adjustment discs are prepared that have the same outer diameter and inner diameter, but differ in at least one of the number of through holes and the inner diameter of the through holes, and a passage adjustment disc is used according to the opening characteristics of the second valve 107. The passage adjustment discs 101a to 101c are also formed by stamping out sheet material using a press. 【0073】 The first embodiment can also be modified as shown in the following modified example 1. 【0074】 <Example 1> In Modification 1, as shown in Figure 9, a cage body 25A, which is partially different from the cage body 25, is used in place of the cage body 25. The cage body 25A has a second passage hole 81A, which is different from the second passage hole 81, in place of the second passage hole 81, so as to open to the bottom surface of the third annular groove 83. The second passage hole 81A is arc-shaped and is an elongated hole that is long in the circumferential direction of the cage body 25A. The second passage hole 81A also extends in the axial direction of the cage body 25A. In Modification 1, the cage body 25A is provided with multiple second passage holes 81A of the same shape, specifically in four locations. The multiple second passage holes 81A are aligned in the radial direction of the cage body 25A and arranged at equal intervals in the circumferential direction of the cage body 25A. The positions of the multiple second passage holes 81A in the circumferential direction of the cage body 25A are offset from the multiple first passage holes 71. 【0075】 Modification 1 also produces the same effects as the first embodiment. 【0076】 [Second Embodiment] Next, the second embodiment will be described, focusing mainly on the differences from the first embodiment, based on Figures 10 to 12. Parts common to both the first and second embodiments will be represented by the same designations and reference numerals. 【0077】 In the first embodiment, the case in which the passage adjustment disc 101 is not positioned in the circumferential direction of the cage body 25 was described as an example. In this configuration, the difference in the circumferential position of the passage adjustment disc 101 relative to the cage body 25 changes the flow of the oil liquid L that flows from the multiple through holes 131 of the passage adjustment disc 101 through the third annular groove 83 to the multiple second passage holes 81 of the second passage 62, which may slightly change the opening characteristics of the second valve 107 during the compression stroke. For this reason, in the second embodiment, the opening characteristics of the second valve 107 during the compression stroke are made more stable than in the first embodiment. 【0078】 In the second embodiment, as shown in Figure 10, a cage body 25B, which is partially different from the cage body 25, is used in place of the cage body 25. The cage body 25B has a projection 151 formed at a predetermined position on the land portion 91, which protrudes from the land portion 91 toward the lower chamber 49 in the axial direction of the cage body 25B. 【0079】 In the second embodiment, as shown in Figure 11, a passage adjustment disc 101B, which is partially different from the passage adjustment disc 101, is used in place of the passage adjustment disc 101. The passage adjustment disc 101B has a notch 152 formed on its outer circumference. The notch 152 penetrates the passage adjustment disc 101B in the axial direction and opens outward in the radial direction of the passage adjustment disc 101B. The notch 152 is positioned at the center between adjacent through holes 131 in the circumferential direction of the passage adjustment disc 101B. The passage adjustment disc 101B, including the notch 152, is also formed by stamping out a sheet material using a press. 【0080】 Then, when the passage adjustment disc 101B is placed on the land portion 91 and the fixed sheet portion 92 of the cage body 25B, the notch portion 152 of the passage adjustment disc 101B is engaged with the protrusion portion 151 of the cage body 25B, as shown in Figure 12. This makes it possible to keep the positional relationship between the multiple through holes 131 of the passage adjustment disc 101B and the multiple second passage holes 81 of the second passage 62 constant in the circumferential direction of the cage body 25B. The notch portion 152 of the passage adjustment disc 101B and the protrusion portion 151 of the cage body 25B are provided on the cage body 25B and the passage adjustment disc 101B, and they engage with each other to form an engaging portion 153 that positions the passage adjustment disc 101B in the circumferential direction relative to the cage body 25B. 【0081】 In the second embodiment, in addition to the passage adjustment disc 101B, multiple passage adjustment discs are prepared and used selectively, each having a notch 152 and through holes that differ from the through holes 131 in at least one of the number and inner diameter. 【0082】 In the second embodiment of the above configuration, an engaging portion 153 is provided on the cage body 25B and the passage adjustment disc 101B, which engage with each other to position the passage adjustment disc 101B circumferentially relative to the cage body 25B. As a result, the flow of oil liquid L from the multiple through holes 131 of the passage adjustment disc 101B to the multiple second passage holes 81 of the second passage 62 can be stabilized, and the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke can be stabilized. 【0083】 In this second embodiment, it is also possible to form a protrusion 151 on the cage body 25A of Modification 1 and use it in place of the cage body 25B. 【0084】 Furthermore, in the second embodiment, conversely to the above, a projection may be provided on the outer circumference of the passage adjustment disc that protrudes in the axial direction of the passage adjustment disc, and a recess may be provided in the land portion of the cage body that is recessed in the axial direction of the cage body to engage with this projection, thereby forming an engaging portion with these projections and recesses. 【0085】 [Third Embodiment] Next, the third embodiment will be described, focusing mainly on the differences from the first embodiment, based on Figures 13 to 15. Parts common to both the first and third embodiments will be represented by the same designations and reference numerals. 【0086】 The third embodiment, like the second embodiment, stabilizes the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke more than the first embodiment. 【0087】 In the third embodiment, as shown in Figure 13, a cage body 25C, which is partially different from the cage body 25, is used in place of the cage body 25. The cage body 25C has a projection 151C formed at a predetermined position on the fixed sheet portion 92, which protrudes from the fixed sheet portion 92 toward the lower chamber 49 (see Figure 2) in the axial direction of the cage body 25. 【0088】 In the third embodiment, as shown in Figure 14, a passage adjustment disc 101C, which is partially different from the passage adjustment disc 101, is used in place of the passage adjustment disc 101. The passage adjustment disc 101C has a notch 152C formed on its inner circumference. The notch 152C penetrates the passage adjustment disc 101C in the axial direction and opens inward in the radial direction of the passage adjustment disc 101C. The notch 152C is positioned at the center between adjacent through holes 131 in the circumferential direction of the passage adjustment disc 101C. The protrusion height of the projection 151C shown in Figure 13 from the fixed sheet portion 92 is set to be less than or equal to the thickness of the passage adjustment disc 101C shown in Figure 14. The passage adjustment disc 101C, including the notch 152C, is also formed by stamping out a sheet material using a press. 【0089】 Then, when the passage adjustment disc 101C is placed on the land portion 91 and the fixed sheet portion 92 of the cage body 25C shown in Figure 13, the notch portion 152C of the passage adjustment disc 101C is engaged with the protrusion portion 151C of the cage body 25C, as shown in Figure 15. This makes it possible to keep the positional relationship between the multiple through holes 131 of the passage adjustment disc 101C and the multiple second passage holes 81 of the second passage 62 constant in the circumferential direction of the cage body 25C. The notch portion 152C of the passage adjustment disc 101C and the protrusion portion 151C of the cage body 25C are provided on the cage body 25C and the passage adjustment disc 101C, and they engage with each other to form an engagement portion 153C that positions the passage adjustment disc 101C in the circumferential direction relative to the cage body 25C. 【0090】 In the third embodiment, in addition to the passage adjustment disc 101C, multiple passage adjustment discs are prepared and selectively used, each having a notch 152C and through holes that differ from the through holes 131 in at least one of the number and inner diameter. 【0091】 In the third embodiment of the above configuration, an engaging portion 153C is provided on the cage body 25C and the passage adjustment disc 101C, which engage with each other to position the passage adjustment disc 101C circumferentially relative to the cage body 25C. As a result, the flow of oil liquid L from the multiple through holes 131 of the passage adjustment disc 101C to the multiple second passage holes 81 of the second passage 62 can be stabilized, and the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke can be stabilized. 【0092】 In this third embodiment, it is also possible to form a protrusion 151C on the cage body 25A of Modification 1 and use it in place of the cage body 25C. 【0093】 Furthermore, in the third embodiment, conversely to the above, a projection may be provided on the inner circumference of the passage adjustment disc that protrudes in the axial direction of the passage adjustment disc, and a recess may be provided in the fixing sheet portion of the cage body that is recessed in the axial direction of the cage body to engage with this projection, thereby forming an engaging portion with these projections and recesses. 【0094】 [Fourth Embodiment] Next, the fourth embodiment will be described, focusing mainly on the differences from the first embodiment, based on Figures 16 to 18. Parts common to both the first embodiment and the fourth embodiment will be represented by the same designation and reference numerals. 【0095】 The fourth embodiment, like the second and third embodiments, stabilizes the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke more than the first embodiment. 【0096】 In the fourth embodiment, as shown in Figure 16, a passage adjustment disk 101D, which is partially different from the passage adjustment disk 101, is used in place of the passage adjustment disk 101. 【0097】 The passage adjustment disc 101D is annular. The passage adjustment disc 101D does not have the through hole 131 of the passage adjustment disc 101. The inner diameter of the passage adjustment disc 101D is the same as the inner diameter of the passage adjustment disc 101, and its outer diameter is smaller than the outer diameter of the passage adjustment disc 101. The outer diameter of the passage adjustment disc 101D is larger than the inscribed circles of the multiple second passage holes 81 of the cage body 25, and smaller than the circumscribed circles of the multiple second passage holes 81 of the cage body 25. As a result, when the passage adjustment disc 101D is placed on the fixing sheet portion 92 (see Figure 2) of the cage body 25, its outer circumference moves inward in the radial direction of the cage body 25 from the land portion 91. That is, the passage adjustment disc 101D partially covers the second passage 62 in the radial direction of the cage body 25, narrowing the second passage 62. The aisle adjustment disc 101D is also formed by punching out sheet metal using a press. 【0098】 In the fourth embodiment of the above configuration, the passage adjustment disc 101D partially covers the second passage 62 in the radial direction of the cage body 25, thereby narrowing the second passage 62. Therefore, even without positioning the passage adjustment disc 101D circumferentially with respect to the cage body 25, the flow of oil liquid L from the passage between the passage adjustment disc 101D and the land portion 91 to the multiple second passage holes 81 of the second passage 62 can be stabilized, and the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke can be stabilized. 【0099】 In the fourth embodiment, in addition to the passage adjustment disc 101D, a passage adjustment disc 101Da shown in Figure 17, which has a larger outer diameter than the passage adjustment disc 101D, and a passage adjustment disc 101Db shown in Figure 18, which has a larger outer diameter than the passage adjustment disc 101Da, are prepared. Multiple types of passage adjustment discs with different outer diameters are prepared, and a passage adjustment disc is used according to the required opening characteristics of the second valve 107 (see Figure 2). The passage adjustment discs 101Da and 101Db are also formed by stamping out sheet material using a press. 【0100】 In this fourth embodiment, it is also possible to use the cage body 25A of Modification 1 in place of the cage body 25. 【0101】 [Fifth Embodiment] Next, the fifth embodiment will be described, focusing mainly on the differences from the first embodiment, based on Figures 19 to 21. Parts common to both the first embodiment and the fifth embodiment will be represented by the same designation and reference numerals. 【0102】 The fifth embodiment, like the second to fourth embodiments, stabilizes the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke more than the first embodiment. 【0103】 In the fifth embodiment, as shown in Figure 19, a passage adjustment disk 101E, which is partially different from the passage adjustment disk 101, is used in place of the passage adjustment disk 101. 【0104】 The passage adjustment disc 101E has a shape in which a part of the annular section is missing. In other words, the passage adjustment disc 101E is not circular, but arc-shaped. The passage adjustment disc 101E does not have the through hole 131 of the passage adjustment disc 101. The inner diameter of the passage adjustment disc 101E is the same as the inner diameter of the passage adjustment disc 101, and its outer diameter is the same as the outer diameter of the passage adjustment disc 101. As a result, as shown in Figure 19, when the passage adjustment disc 101E is placed on the land portion 91 and the fixed sheet portion 92 of the cage body 25, it partially covers the second passage 62 in the circumferential direction of the cage body 25, thereby narrowing the second passage 62. The passage adjustment disc 101E is also formed by stamping out a sheet material using a press. 【0105】 In the fifth embodiment of the above configuration, the passage adjustment disc 101E partially covers the second passage 62 in the circumferential direction of the cage body 25, thereby narrowing the second passage 62. Therefore, even without positioning the passage adjustment disc 101E circumferentially with respect to the cage body 25, the flow of the oil liquid L from the passage between the passage adjustment disc 101E, the land portion 91, and the fixed seat portion 92 to the multiple second passage holes 81 of the second passage 62 can be stabilized, and the opening characteristics of the second valve 107 (see Figure 2) during the compression stroke can be stabilized. 【0106】 In the fifth embodiment, in addition to the passage adjustment disc 101E, a passage adjustment disc 101Ea shown in Figure 20, which has a shorter circumferential length than the passage adjustment disc 101E, and a passage adjustment disc 101Eb shown in Figure 21, which has a shorter circumferential length than the passage adjustment disc 101Ea, are prepared. Multiple types of passage adjustment discs with different circumferential lengths are prepared, and a passage adjustment disc is used according to the required opening characteristics of the second valve 107 (see Figure 2). The passage adjustment discs 101Ea and 101Eb are also formed by stamping out sheet material using a press. 【0107】 In this fifth embodiment, it is also possible to use the cage body 25A of the modified example 1 in place of the cage body 25. 【0108】 [Sixth Embodiment] Next, the sixth embodiment will be described mainly based on Figure 22. Parts common to the first to fifth embodiments will be represented by the same designation and reference numerals. 【0109】 In the sixth embodiment described above, as shown in Figure 22, the body valve assembly 30F does not have a third annular groove 83, and a cage body 25F is used in which a plurality of second passage holes 81F, whose axial length is longer than that of the plurality of second passage holes 81 by the amount of the third annular groove 83, constitutes the second passage 62F. That is, when using a cage body 25F that does not have such a third annular groove 83 and in which the second passage holes 81F directly communicate with the passage in the through hole 131, adopting the engaging portion 153 of the second embodiment, adopting the engaging portion 153C of the third embodiment, adopting the passage adjustment disc 101D of the fourth embodiment, or adopting the passage adjustment disc 101E of the fifth embodiment will have a high effect in stabilizing the opening characteristics of the second valve 107 during the compression stroke. 【0110】 In this embodiment, a hydraulic shock absorber was shown as an example of the shock absorber 11, but the above structure can also be used for shock absorbers that use water or air as the working fluid. [Industrial applicability] 【0111】 According to the above embodiment of the present invention, it is possible to provide a shock absorber that can suppress cost increases. Therefore, it has great industrial applicability. [Explanation of Symbols] 【0112】 11...Shock absorber, 17...Cylinder, 18...Inner chamber, 25, 25A~25C...Cage body, 42...Bottom chamber (second chamber), 49...Lower chamber (first chamber), 61...First passage, 62...Second passage, 74...Outer seat section (first seat section), 75...Inner seat section (first seat section), 85...Seat section (second seat section), 101, 101B, 101C, 101Da, 101Db, 101E, 101Ea, 101Eb...Passage adjustment disc, 103...First valve, 107...Second valve, 131...Through hole, 135...Communication hole, 153, 153C...Engaging part.

Claims

[Claim 1] A cylinder with the inner chamber on the inside, A cage body that divides the interior chamber into a first chamber and a second chamber, comprising: a first passage connecting the first chamber and the second chamber; a first sheet portion provided surrounding the end of the first passage on the first chamber side; a second passage connecting the first chamber and the second chamber; and a second sheet portion provided surrounding the end of the second passage on the second chamber side; A first valve that contacts the first seat portion to close the first passage and moves away from the first seat portion to open the first passage, the first valve having a communication hole that communicates with the second passage, A second valve that contacts the second seat portion to close the second passage, and moves away from the second seat portion to open the second passage, A passage adjustment disc is provided between the first valve and the cage body to narrow the second passage, Equipped with, The aforementioned passage adjustment disk is annular, The passage adjustment disc has a through hole that penetrates axially between its inner and outer circumferences. The cage body and the passage adjustment disc are provided with engaging portions that engage with each other to position the passage adjustment disc circumferentially relative to the cage body. Shock absorber. [Claim 2] The shock absorber according to claim 1, wherein the passage adjustment disc partially covers the second passage in the radial direction of the cage body. [Claim 3] The shock absorber according to claim 1, wherein the passage adjustment disc has a shape in which a part of the annular portion is missing, and partially covers the second passage in the circumferential direction of the cage body. [Claim 4] A cylinder with the inner chamber on the inside, A cage body that divides the interior chamber into a first chamber and a second chamber, comprising: a first passage connecting the first chamber and the second chamber; a first sheet portion provided surrounding the end of the first passage on the first chamber side; a second passage connecting the first chamber and the second chamber; and a second sheet portion provided surrounding the end of the second passage on the second chamber side; A first valve that contacts the first seat portion to close the first passage and moves away from the first seat portion to open the first passage, the first valve having a communication hole that communicates with the second passage, A second valve that contacts the second seat portion to close the second passage, and moves away from the second seat portion to open the second passage, A passage adjustment disc is provided between the first valve and the cage body to narrow the second passage, Equipped with, The passage adjustment disc has an annular shape with a portion missing, and partially covers the second passage in the circumferential direction of the cage body. Shock absorber.