JP2022010514A - How to manufacture a shock absorber and a shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorber whose valve opening characteristics can be easily adjusted.
SOLUTION: A pin member 68, a seat member 25 having a cylinder portion 84 into which the pin member 68 is inserted, an inner seat portion 85 and an outer seat portion 86, and an outside of the cylinder portion 84 mounted on the cylinder portion 84. A retainer 121 having a diameter larger than the diameter, a disc valve 66 provided in contact with the inner seat portion 85 and the outer seat portion 86 and movable in the axial direction of the pin member 68 along the outer periphery of the tubular portion 84, and a retainer. A spring member 122 mounted on 121 and pressing the disc valve 66 toward the inner seat portion 85 and the outer seat portion 86 is provided.
[Selection diagram] Fig. 2

Description

The present invention relates to a shock absorber and a method for manufacturing the shock absorber.

There is a shock absorber having a configuration in which the disc valve is lifted both inside and outside to open the flow path when the valve is opened (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2015-31305

In the shock absorber, there is a demand for facilitating the adjustment of valve opening characteristics.

Therefore, it is an object of the present invention to provide a shock absorber and a method for manufacturing a shock absorber that can facilitate adjustment of valve opening characteristics.

In order to achieve the above object, the first aspect of the present invention is to mount the pin member, a cylinder portion through which the pin member is inserted, a seat member having an inner seat portion and an outer seat portion, and the cylinder portion. A retainer having a diameter larger than the outer diameter of the cylinder portion to be placed is provided in contact with the inner seat portion and the outer seat portion, and moves in the axial direction of the pin member along the outer periphery of the cylinder portion. It is configured to include a possible disc valve and a spring member that is mounted on the retainer and presses the disc valve toward the inner seat portion and the outer seat portion.

A second aspect of the present invention is a pin member, a cylinder portion through which the pin member is inserted, a sheet member having an inner seat portion and an outer seat portion, and a cylinder mounted on the cylinder portion. A retainer having a diameter larger than the outer diameter of the portion, a disc valve provided in contact with the inner seat portion and the outer seat portion, and movable in the axial direction of the pin member along the outer periphery of the tubular portion. A method for manufacturing a shock absorber comprising a spring member mounted on the retainer and pressing the disc valve toward the inner seat portion and the outer seat portion, by using the retainers having different outer diameters properly. , The flexible amount of the disc valve is changed.

According to the present invention, it is possible to facilitate the adjustment of the valve opening characteristic.

It is sectional drawing which shows the shock absorber of one Embodiment which concerns on this invention. It is sectional drawing which shows the main part of the shock absorber of one Embodiment which concerns on this invention. It is a top view which shows the spring member of the shock absorber of one Embodiment which concerns on this invention. It is sectional drawing which shows the main part of the shock absorber of one Embodiment which concerns on this invention, and shows the open state of a disk valve. It is sectional drawing which shows the main part of the shock absorber of one Embodiment which concerns on this invention, and shows the open state of a disk valve. It is a characteristic diagram which shows the valve opening characteristic of the disk valve of the shock absorber of one Embodiment which concerns on this invention.

An embodiment of the present invention will be described below with reference to the drawings.

The shock absorber 11 of the present embodiment is a shock absorber used for a suspension device of a vehicle such as an automobile or a railroad vehicle, and specifically, is a shock absorber used for a strut type suspension of an automobile. As shown in FIG. 1, the shock absorber 11 is a cylinder 17 having a cylindrical inner cylinder 15 and a bottomed tubular outer cylinder 16 having a diameter larger than that of the inner cylinder 15 and provided on the outer peripheral side of the inner cylinder 15. It is a double-cylinder type shock absorber equipped with. A reservoir chamber 18 is formed between the outer cylinder 16 and the inner cylinder 15.

The outer cylinder 16 is an integrally molded product made of one metal member, and has a cylindrical side wall portion 21, a bottom portion 22 that closes one end side of the side wall portion 21 in the axial direction, and a bottom portion 22 of the side wall portion 21. It has an opening 23 on the opposite side.

The shock absorber 11 includes an annular valve body 25 (seat member) provided at one end of the inner cylinder 15 in the axial direction, and an annular rod provided at the other end of the inner cylinder 15 and the outer cylinder 16 in the axial direction. It has a guide 26 and. The outer peripheral portion of the valve body 25 has a small diameter portion and a large diameter portion having a larger diameter. The outer peripheral portion of the rod guide 26 also has a small diameter portion and a large diameter portion having a larger diameter.

One end of the inner cylinder 15 in the axial direction is fitted to a small diameter portion of the valve body 25, and is engaged with the bottom portion 22 of the outer cylinder 16 via the valve body 25. Further, the other end of the inner cylinder 15 in the axial direction is fitted to the small diameter portion of the rod guide 26, and is engaged with the side wall portion 21 of the outer cylinder 16 via the rod guide 26. In this state, the inner cylinder 15 is positioned in the radial direction with respect to the outer cylinder 16. Here, the valve body 25 and the bottom portion 22 communicate with each other between the inner cylinder 15 and the outer cylinder 16 via a passage groove 35 formed in the valve body 25, and the inner cylinder 15 and the outer cylinder 16 communicate with each other. The reservoir chamber 18 is configured in the same manner as between the two.

The valve body 25 has a perforated disk-shaped body main body portion 36, and a plurality of leg portions 37 projecting from the outer peripheral side of the body main body portion 36 to one side in the axial direction. The above-mentioned passage groove 35 is formed between the adjacent leg portions 37 so as to cross the leg portions 37 in the radial direction of the body main body portion 36.

The shock absorber 11 has an annular sealing member 41 on the side opposite to the bottom portion 22 of the rod guide 26. The seal member 41 is also fitted to the inner peripheral portion of the side wall portion 21 in the same manner as the rod guide 26. At the end of the side wall portion 21 opposite to the bottom portion 22, the side wall portion 21 is plastically deformed inward in the radial direction by crimping such as curling to form a crimping portion 43. The seal member 41 is sandwiched between the crimping portion 43 and the rod guide 26. The seal member 41 closes the opening 23 of the outer cylinder 16, and is specifically an oil seal. The seal member 41 may be formed of a seal washer.

The shock absorber 11 has a piston 45 provided in the cylinder 17. The piston 45 is slidably fitted to the inner cylinder 15. The piston 45 divides the inside of the inner cylinder 15 into two chambers, a first chamber 48 and a second chamber 49. The first chamber 48 is provided between the piston 45 in the inner cylinder 15 and the rod guide 26, and the second chamber 49 is provided between the piston 45 in the inner cylinder 15 and the valve body 25. The second chamber 49 is defined as the reservoir chamber 18 by the valve body 25. The first chamber 48 and the second chamber 49 are filled with the oil liquid L as the working fluid, and the reservoir chamber 18 is filled with the gas G and the oil liquid L as the working fluid. Therefore, the shock absorber 11 is a hydraulic shock absorber.

The shock absorber 11 has a rod 51 having one end connected to the piston 45 and the other side extending outward from the outer cylinder 16 of the cylinder 17 through the opening 23. A piston 45 is connected to the rod 51 by a nut 53. The rod 51 extends outward from the inner cylinder 15 and the outer cylinder 16 through the rod guide 26 and the seal member 41. The rod 51 is guided by the rod guide 26 and moves in the axial direction integrally with the piston 45 with respect to the inner cylinder 15 and the outer cylinder 16.

The seal member 41 closes between the opening 23 of the outer cylinder 16 and the rod 51, and the oil liquid L in the inner cylinder 15 and the gas G and the oil liquid L in the reservoir chamber 18 leak to the outside. To regulate.

The piston 45 is formed with a passage 55 and a passage 56 that penetrate in the axial direction. The passages 55 and 56 allow communication between the first room 48 and the second room 49. The shock absorber 11 has an annular disc valve 57 capable of closing the passage 55 by abutting on the piston 45 on the side opposite to the axial bottom 22 of the piston 45. Further, the shock absorber 11 has an annular disc valve 58 that can close the passage 56 by abutting on the piston 45 on the axial bottom portion 22 side of the piston 45. The disc valves 57 and 58 are connected to the rod 51 together with the piston 45. The passage 55 is open to the second chamber 49, and the passage 56 is open to the first chamber 48.

In the disc valve 57, the rod 51 moves to the contraction side that increases the amount of entry into the inner cylinder 15 and the outer cylinder 16, the piston 45 moves in the direction of narrowing the second chamber 49, and the pressure of the second chamber 49 becomes the first. When the pressure becomes higher than the pressure of the chamber 48 by a predetermined value or more, the passage 55 is opened and the oil liquid L of the second chamber 49 is flown to the first chamber 48 through the passage 55, and a damping force is generated at that time. In the disc valve 58, the rod 51 moves to the extension side that increases the amount of protrusion from the inner cylinder 15 and the outer cylinder 16, the piston 45 moves in the direction of narrowing the first chamber 48, and the pressure of the first chamber 48 is the second chamber. When the pressure becomes higher than the pressure of 49 by a predetermined value or more, the passage 56 is opened and the oil liquid L of the first chamber 48 is flown to the second chamber 49 through the passage 56, and a damping force is generated at that time.

At least one of the piston 45 and the disc valve 57 has a fixed orifice (not shown) that allows the first chamber 48 and the second chamber 49 to communicate with each other through the passage 55 even when the disc valve 57 most closes the passage 55. It is formed. Further, fixing to at least one of the piston 45 and the disc valve 58, which allows the first chamber 48 and the second chamber 49 to communicate with each other via the passage 56 even when the disc valve 58 is in the state where the passage 56 is most closed. An orifice is formed.

The shock absorber 11 has a body valve 60 on the bottom 22 side of the cylinder 17. The valve body 25 described above constitutes the body valve 60. The valve body 25 is formed with a passage 61 and a passage 62 penetrating in the axial direction. The passages 61 and 62 allow the second chamber 49 and the reservoir chamber 18 to communicate with each other.

The body valve 60 has an annular disc valve 65 on the axial bottom 22 side of the valve body 25 that can close the passage 61 by abutting on the valve body 25. Further, the body valve 60 has an annular disc valve 66 capable of closing the passage 62 by abutting on the valve body 25 on the side opposite to the axial bottom portion 22 of the valve body 25. The body valve 60 has a pin member 68, and the disc valves 65 and 66 are connected to the valve body 25 by the pin member 68.

The body valve 60 composed of a valve body 25, disc valves 65, 66, a pin member 68, and the like defines the inside of a cylinder 17 into two chambers, a second chamber 49 and a reservoir chamber 18. The passage 61 always communicates with the second chamber 49, and the passage 62 always communicates with the reservoir chamber 18.

In the body valve 60, when the rod 51 moves to the contraction side and the piston 45 moves in the direction of narrowing the second chamber 49 and 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 Opens the passage 61 and causes the oil liquid L of the second chamber 49 to flow to the reservoir chamber 18 through the passage 61, and at that time, a damping force is generated. In the body valve 60, when the rod 51 moves to the extension side, the piston 45 moves to the first chamber 48 side, and the pressure in the second chamber 49 drops below the pressure in the reservoir chamber 18, the disc valve 66 opens the passage 62. The oil liquid L of the reservoir chamber 18 will flow to the second chamber 49 through the passage 62. The disc valve 66 is a suction valve that allows the oil liquid L to flow from the reservoir chamber 18 into the second chamber 49 without substantially generating a damping force at that time.

A locking member 71 is fixed to the rod 51 between the piston 45 and the rod guide 26, and a cushioning member 72 is provided between the locking member 71 and the rod guide 26. The cushioning member 72 is in contact with the locking member 71, and when the rod 51 moves to a predetermined position on the extension side, it abuts on the rod guide 26 to alleviate the impact.

The valve body 25 is made of metal, and as shown in FIG. 2, is seamlessly integrally molded into an annular shape having the body body portion 36 and the plurality of leg portions 37 described above. The body body portion 36 is mainly composed of a perforated disk-shaped base portion 83, and a plurality of leg portions 37 project from the position on the outer peripheral side of the base portion 83 to one side along the axial direction of the base portion 83. ing.

The body body portion 36 has a cylindrical tubular portion 84 that protrudes from a position on the inner peripheral side of the base portion 83 to the side opposite to the leg portion 37 in the axial direction thereof. The body body portion 36 has an annular inner seat portion 85 protruding from a position outside the tubular portion 84 in the radial direction of the base portion 83 to the side opposite to the leg portion 37 in the axial direction of the base portion 83, and a base portion. It has an annular outer seat portion 86 that projects from a position outside the inner seat portion 85 in the radial direction of the 83 to the side opposite to the leg portion 37 in the axial direction of the base portion 83.

The body body portion 36 has a cylindrical fixed sheet portion 88 that protrudes from the position on the inner peripheral side of the base portion 83 toward the leg portion 37 in the axial direction thereof. The body body portion 36 has an annular seat portion 89 that protrudes from the position between the fixed seat portion 88 and the leg portion 37 in the radial direction of the base portion 83 toward the leg portion 37 in the axial direction of the base portion 83. ing. Therefore, the valve body 25 is a seat member having an inner seat portion 85, an outer seat portion 86, a fixed seat portion 88, and a seat portion 89.

A circular through hole 91 through which the radially inner portion of the tubular portion 84, the radially inner portion of the base portion 83, and the radially inner portion of the fixed sheet portion 88 penetrate the body body portion 36 in the axial direction. It has become. The through hole 91 is provided at the center position in the radial direction of the valve body 25 so as to penetrate the valve body 25 in the axial direction. The outer peripheral surface 92 of the tubular portion 84 is a cylindrical surface coaxial with the through hole 91.

In the axial direction of the body body portion 36, the inner seat portion 85 and the outer seat portion 86 match the height positions of the tip surfaces on the opposite sides of the base portion 83. In the axial direction of the body body portion 36, the height position of the tip surface of the cylinder portion 84 on the side opposite to the base portion 83 is higher than the tip surface of the inner seat portion 85 and the tip surface of the outer seat portion 86. There is. In other words, the tubular portion 84 has a higher height in the protruding direction from the base portion 83 than the inner seat portion 85 and the outer seat portion 86. In the axial direction of the body body portion 36, the height position of the tip surface of the seat portion 89 is slightly higher in the protruding direction than the tip surface of the fixed seat portion 88.

The passage 61 has one end opened between the tubular portion 84 and the inner seat portion 85 and the other end opened between the fixed seat portion 88 and the seat portion 89 and penetrates the body main body portion 36 in the axial direction. There is. The passages 61 are formed at a plurality of locations (in FIG. 1, FIG. 2, FIG. 4, and FIG. 5, only one location is shown because of the cross section in FIG. 5) at intervals in the circumferential direction of the body main body portion 36. The aisle 62 has one end opened between the inner seat portion 85 and the outer seat portion 86 and the other end opened between the seat portion 89 and the leg portion 37 and penetrates the body main body portion 36 in the axial direction. There is. The passages 62 are formed at a plurality of locations (only one location is shown in FIGS. 1, FIG. 2, FIG. 4, and FIG. 5 because of the cross section) at intervals in the circumferential direction of the body main body portion 36.

The body valve 60 has the above-mentioned disc valve 65, disc 95, and regulation disc 96 in order from the axial body main body 36 side on the axial leg 37 side of the body main body 36. The disc valve 65 is composed of a plurality of discs 97, specifically, three discs 97. The disk 95 is a perforated circular flat plate having a circular through hole 100 formed in the center in the radial direction, and is made of metal. The regulation disk 96 is also a perforated circular flat plate having a circular through hole 101 formed in the center in the radial direction, and is made of metal. Each of the plurality of discs 97 is a perforated circular flat plate having a circular through hole 102 formed in the center in the radial direction, and is made of metal.

The plurality of discs 97 have the same outer diameter and are slightly larger than the outer diameter of the sheet portion 89. Of the plurality of discs 97, the one closest to the body body 36 comes into contact with the fixed seat 88 and the seat 89. The outer diameter of the disc 95 is smaller than the outer diameter of the disc 97, and is substantially the same as the outer diameter of the fixed sheet portion 88. The outer diameter of the regulation disc 96 is slightly smaller than the outer diameter of the disc 97, and is substantially the same as the outer diameter of the seat portion 89.

The body valve 60 has the pin member 68 described above. The pin member 68 is made of metal and has a columnar shape that fits into the through hole 101 of the regulation disk 96, the through hole 100 of the disk 95, the through hole 102 of a plurality of disks 97, the through hole 91 of the valve body 25, and the like. The shaft portion 105, the disc-shaped base end flange portion 106 extending radially outward from one end in the axial direction of the shaft portion 105, and the circle extending radially outward from the other end in the axial direction of the shaft portion 105. It has a plate-shaped tip flange portion 107. In the pin member 68, the base end flange portion 106 sandwiches the regulation disc 96, the disc 95, and a plurality of discs 97 with the fixed sheet portion 88. The base end flange portion 106 has an outer diameter larger than the outer diameter of the fixed seat portion 88 and a smaller diameter than the inner diameter of the seat portion 89.

The body valve 60 has the above-mentioned disc valve 66 on the side of the base portion 83 opposite to the leg portion 37 in the axial direction. The disc valve 66 is made of metal and has a perforated circular flat plate having a constant thickness in which an insertion hole 111 penetrating in the axial direction, that is, in the thickness direction is formed in the center. The inner diameter of the insertion hole 111 is slightly larger than the outer diameter of the tubular portion 84 of the valve body 25, that is, the diameter of the outer peripheral surface 92 of the tubular portion 84. The outer diameter of the disc valve 66 is slightly larger than the outer diameter of the outer seat portion 86. The disc valve 66 comes into contact with both the inner seat portion 85 and the outer seat portion 86 with the tubular portion 84 inserted through the insertion hole 111.

The height of the tubular portion 84 in the axial direction from the inner seat portion 85 and the outer seat portion 86 in the protruding direction is longer than the thickness of the disc valve 66. In other words, the distance between the tip surface of the inner seat portion 85 and the tip surface of the outer seat portion 86 in the axial direction of the valve body 25 and the tip surface of the cylinder portion 84 is longer than the thickness of the disc valve 66. The disc valve 66 is slidable or movable in the axial direction of the tubular portion 84 along the outer peripheral surface 92 of the tubular portion 84, and the inner peripheral end and the outer peripheral end move together during the movement. The disc valve 66 is formed with a passage hole 112 penetrating in the axial direction, that is, in the thickness direction, at a position between the tubular portion 84 in the radial direction and the inner seat portion 85. The passage hole 112 always communicates with the passage 61 of the valve body 25.

The body valve 60 has a retainer 121, a spring member 122, and a washer 123 in this order from the tubular portion 84 side on the side opposite to the axial leg portion 37 of the tubular portion 84.

The retainer 121 is made of metal and is in the shape of a perforated circular flat plate having a constant thickness in which a circular through hole 131 penetrating in the axial direction, that is, in the thickness direction is formed in the center in the radial direction. The retainer 121 has a cylindrical surface whose outer peripheral surface 132 is coaxial with the through hole 131. The outer diameter of the retainer 121 is larger than the outer diameter of the tubular portion 84 and smaller than the inner diameter of the inner sheet portion 85. In other words, the retainer 121 has a diameter of the outer peripheral surface 132 larger than the diameter of the outer peripheral surface 92 of the tubular portion 84.

The spring member 122 is made of metal, and as shown in FIG. 3, the flat plate portion 142 having a perforated circular flat plate shape having a constant thickness on the center side and extending outward in the radial direction from the flat plate portion 142. It has a plurality of foot portions 143, specifically, three foot portions 143. The flat plate portion 142 is formed with a circular through hole 144 penetrating in the axial direction, that is, in the thickness direction, at the center in the radial direction. The flat plate portion 142 has a cylindrical surface whose outer peripheral surface 145 is coaxial with the through hole 144. A plurality of foot portions 143 are formed at equal intervals in the circumferential direction of the flat plate portion 142.

As shown in FIG. 2, the foot portion 143 is inclined with respect to the flat plate portion 142 so that the foot portion 143 is radially outwardly separated from the flat plate portion 142 and is also axially separated from the flat plate portion 142. The spring member 122 is oriented so that the foot portion 143 extends from the flat plate portion 142 so as to be inclined toward the disc valve 66. The outer diameter of the flat plate portion 142 is larger than the outer diameter of the retainer 121. In other words, the diameter of the outer peripheral surface 145 of the flat plate portion 142 is larger than the diameter of the outer peripheral surface 132 of the retainer 121. In the spring member 122, the diameter of the circumscribed circle connecting the tip portions of the plurality of foot portions 143 opposite to the flat plate portion 142 is larger than the outer diameter of the inner seat portion 85, and the inner diameter of the outer seat portion 86 is larger. It has a smaller diameter than.

The washer 123 is made of metal and has a perforated disk shape in which a circular through hole 151 penetrating in the axial direction, that is, in the thickness direction is formed in the center in the radial direction. The washer 123 includes a perforated disk plate-shaped main plate portion 152 having a through hole 151 formed therein, and an annular portion 153 that is radially outside the main plate portion 152 and constitutes a radial outer end portion of the washer 123. And have. The annulus portion 153 is displaced to one side in the axial direction with respect to the main plate portion 152. In other words, the annular portion 153 projects axially from the main plate portion 152. A passage hole 154 penetrating in the axial direction is formed in the main plate portion 152 of the washer 123. The washer 123 is oriented so that the annular portion 153 projects from the main plate portion 152 toward the disc valve 66 in the axial direction.

The outer diameter of the washer 123 is larger than the diameter of the circumscribed circle connecting the tip portions of the plurality of foot portions 143, and is smaller than the outer diameter of the disc valve 66. The outer diameter of the washer 123 is larger than the diameter of the circumscribed circle connecting the tips of the plurality of foot portions 143 when the plurality of foot portions 143 of the spring member 122 are extended so as to form the same plane as the flat plate portion 142. It has become. The disc valve 66 can come into contact with the annular portion 153 without sandwiching the spring member 122 with the annular portion 153.

In the pin member 68, the shaft portion 105 is fitted into the through hole 131 of the retainer 121, the through hole 144 of the spring member 122, and the through hole 151 of the washer 123. In the pin member 68, the tip flange portion 107 sandwiches the retainer 121, the flat plate portion 142 of the spring member 122, and the main plate portion 152 of the washer 123 with the cylinder portion 84.

When assembling the body valve 60, the regulation disc 96, the disc 95, and a plurality of discs 96, a plurality of discs 95, are inserted on the base end flange portion 106 while inserting the shaft portion 105 in the state before the tip flange portion 107 of the pin member 68 is formed. The valve body 25 including the disc 97 and the cylinder portion 84 of the above is mounted. At this time, the valve body 25 is oriented so that the leg portion 37 projects from the body main body portion 36 toward the proximal flange portion 106 in the axial direction. Then, the disc valve 66 is placed on the valve body 25 by inserting the tubular portion 84. Then, the retainer 121, the spring member 122, and the washer 123 are placed on the cylinder portion 84 while fitting the shaft portion 105. At this time, the spring member 122 is oriented so that the foot portion 143 extends from the flat plate portion 142 toward the base portion 83 in the axial direction of the flat plate portion 142, and the washer 123 has the annular portion 153 from the main plate portion 152. It is oriented so as to project toward the valve body 25 in the axial direction. In this state, while pressing the washer 123 toward the base end flange portion 106, the shaft portion 105 protruding from the washer 123 is crimped to form the tip flange portion 107. In this way, the body valve 60 is assembled.

In this state, the regulation disc 96, the disc 95, a plurality of discs 97, the valve body 25, the retainer 121, the spring member 122, and the washer 123 have at least the inner peripheral portion axial to the proximal flange portion 106 and the distal flange portion 107. Clamped in the direction. At this time, the foot portion 143 of the spring member 122 is slightly elastically deformed and comes into contact with the disc valve 66 mounted on the inner seat portion 85 and the outer seat portion 86.

Further, in this state, the retainer 121 is directly mounted on the tubular portion 84 of the valve body 25. In other words, the retainer 121 abuts on the tubular portion 84 of the valve body 25. At this time, the position of the retainer 121 in the axial direction does not overlap with the tubular portion 84 of the valve body 25. In other words, the retainer 121 is generally on the side opposite to the inner seat portion 85 and the outer seat portion 86 from the tubular portion 84 in the axial direction.

Further, in this state, the disc valve 66 is provided in contact with the inner seat portion 85 and the outer seat portion 86. From this state, the disc valve 66 can move in the axial direction of the pin member 68 along the outer peripheral surface 92 of the tubular portion 84 while elastically deforming the foot portion 143 of the spring member 122.

Further, in this state, the spring member 122 is directly placed on the retainer 121 in the flat plate portion 142 and presses the disc valve 66 toward the inner seat portion 85 and the outer seat portion 86. In other words, the spring member 122 abuts on the retainer 121 at the flat plate portion 142. In the spring member 122, the flat plate portion 142 constituting the entire portion excluding the foot portion 143 does not overlap with the tubular portion 84 of the valve body 25 in the axial direction. In other words, the flat plate portion 142 is entirely on the side opposite to the inner seat portion 85 and the outer seat portion 86 from the tubular portion 84 in the axial direction.

Further, in this state, the washer 123 is directly placed on the flat plate portion 142 of the spring member 122 in the main plate portion 152. In other words, the washer 123 abuts on the flat plate portion 142 of the spring member 122 at the main plate portion 152. The entire washer 123 including the annular portion 153 is located on the side opposite to the inner seat portion 85 and the outer seat portion 86 with respect to the tubular portion 84 in the axial direction.

In the body valve 60, the pressure of the second chamber 49 is a predetermined value higher than the pressure of the reservoir chamber 18 in the contraction stroke in which the rod 51 shown in FIG. 1 moves to the contraction side and the piston 45 moves in the direction of narrowing the second chamber 49. When the valve becomes higher than this, the disc valve 65 elastically deforms so that the outer peripheral side is separated from the seat portion 89 of the valve body 25 in the axial direction, and the disc valve 65 is separated from the seat portion 89 to open the passage 61. As a result, the oil liquid L flows from the second chamber 49 toward the reservoir chamber 18 through the passage hole 112 of the disc valve 66 and the passage 61 of the valve body 25. At this time, the disc valve 65 opens and closes the passage 61 to generate a damping force. The regulation disc 96 abuts on the disc valve 65 to limit the movable range of deformation of the disc valve 65 provided between the regulation disc 96 and the valve body 25. In this contraction stroke, the disc valve 66 is pressed against the inner seat portion 85 and the outer seat portion 86 by the load of the spring member 122 and is seated, closing the passage 62.

In the extension stroke in which the rod 51 shown in FIG. 1 moves to the extension side and the piston 45 moves to the first chamber 48 side, the body valve 60 has a pressure in the second chamber 49 lower than the pressure in the reservoir chamber 18. As shown in the above, the disc valve 66 slides in the axial direction of the pin member 68 along the outer peripheral surface 92 of the tubular portion 84 while elastically deforming the foot portion 143 of the spring member 122, and is inside the valve body 25. The passage 62 is opened by being separated from both the seat portion 85 and the outer seat portion 86. As a result, the oil liquid L flows from the reservoir chamber 18 toward the second chamber 49 through the passage 62 of the valve body 25. At this time, the inner peripheral end and the outer peripheral end of the disc valve 66 both move in the axial direction from the base portion 83, the inner seat portion 85, and the outer seat portion 86, that is, lift.

In the extension stroke, when the stroke speeds of the rod 51 and the piston 45 increase and the pressure of the second chamber 49 further decreases from the pressure of the reservoir chamber 18, the disc valve 66 abuts on the retainer 121 and abuts on the inner peripheral side in the axial direction. The movement, that is, the lift is restricted, and as shown in FIG. 5, the retainer 121 is elastically deformed with the end portion on the tubular portion 84 side in the axial direction as a fulcrum to bring the outer peripheral side closer to the washer 123. Then, the area of the flow path for flowing the oil liquid L from the reservoir chamber 18 toward the second chamber 49 through the passage 62 of the valve body 25 is further increased, and the oil liquid L is flowed to the second chamber 49 at a higher speed. Become. The washer 123 limits the movable range of deformation of the disc valve 66 provided between the washer 123 and the valve body 25 by the annular portion 153 coming into contact with the disc valve 66. In such an extension stroke, the disc valve 66 opens the passage 62 to allow the oil liquid L, which is insufficient in the inner cylinder 15 due to the increase in the amount of protrusion of the rod 51 from the cylinder 17, from the reservoir chamber 18 to the second chamber. Replenish 49. In this extension stroke, the disc valve 65 is seated on the seat portion 89 by its own elastic force and closes the passage 61.

In the method for manufacturing the shock absorber 11 of the present embodiment, when assembling the body valve 60 as described above, a plurality of types of retainers 121 having the same thickness but different outer diameters are prepared and assembled. By selecting, the valve opening characteristic of the disc valve 66 is adjusted. In other words, a plurality of types of retainers 121 having the same thickness but different outer diameters are prepared, one type of retainer 121 is selected from these plurality of types of retainers 121, and one of them is used as a shock absorber 11. By providing it, the valve opening characteristic of the disc valve 66 of the shock absorber 11 is adjusted.

For example, a first retainer 121 having a small outer diameter and a second retainer 121 having a larger outer diameter are prepared, and the first retainer 121 having a smaller outer diameter is assembled to the shock absorber 11. Then, as shown by A1 in FIG. 6, the ratio of the expansion of the opening area of the flow path to the increase in the lift amount of the disc valve 66 with respect to the valve body 25 is in the floating region X1 until the disc valve 66 abuts on the retainer 121. , Although the change is the same as when the second retainer 121 having a large outer diameter shown in A2 is assembled, in the bending region X2 after contacting the retainer 121, the second retainer 121 having a large outer diameter shown in A2 is used. It will be larger than when assembled. That is, in the method of manufacturing the shock absorber 11 of the present embodiment, the flexible amount of the disc valve 66 is changed by properly using the retainers 121 having different outer diameters. Even if the retainer 121 to be prepared has the smallest outer diameter, it has a larger diameter than the outer diameter of the tubular portion 84.

Patent Document 1 describes a shock absorber having a configuration in which a disc valve is lifted both inside and outside to open a flow path when the valve is opened. This disc valve has a structure that comes into contact with the regulating member when it is lifted. Therefore, in order to adjust the valve opening characteristics of the disc valve, it is necessary to change the regulating member. Since the regulating member has a complicated shape having a spring portion and a stroke regulating portion, it is not easy to change. Therefore, with this shock absorber, the valve opening characteristics of the disc valve cannot be easily adjusted.

Further, in this shock absorber, the lift is regulated by the disc valve coming into contact with the stroke regulating portion of the regulating member, and the stroke regulating portion has a shape extending radially outward from the central flat plate portion. Therefore, the bending of the disc valve lift after regulation is also suppressed. Moreover, the regulating member is directly mounted on the guide boss portion of the base valve member, and the stroke regulating portion overlaps the position in the axial direction with the guide boss portion that guides the disc valve. Therefore, the lift amount of the disc valve becomes short.

Here, this disc valve opens when guiding the oil liquid in the reservoir chamber into the cylinder in the extension stroke, and closes in the contraction stroke. If the lift amount of this disc valve, that is, the opening area of the flow path at the time of valve opening is suppressed to a small size, insufficient supply of oil liquid from the reservoir chamber to the inside of the cylinder occurs in the extension stroke, and the initial damping force in the contraction stroke occurs. There may be a delay. Then, the ride quality of the vehicle equipped with this shock absorber may be deteriorated.

On the other hand, in the shock absorber 11 of the present embodiment, the retainer 121 having a diameter larger than the outer diameter of the cylinder portion 84 is provided in the cylinder portion 84 of the valve body 25 having the cylinder portion 84 for guiding the movement of the disc valve 66. It is placed. Then, a spring member 122 that presses the disc valve 66 toward the inner seat portion 85 and the outer seat portion 86 of the valve body 25 is placed on the retainer 121. As described above, since the retainer 121 separate from the spring member 122 is provided between the cylinder portion 84 and the spring member 122, the valve opening characteristic of the disc valve 66 is adjusted by changing the retainer 121. be able to. Therefore, the valve opening characteristic of the disc valve 66 can be easily adjusted.

Further, since the retainer 121 is separate from the spring member 122, the outer diameter can be kept small. Specifically, the outer diameter of the retainer 121 can be made smaller than that of the flat plate portion 142 of the spring member 122. Therefore, the amount of flexibility after the disc valve 66 comes into contact with the retainer 121 can be increased. As a result, the opening area of the disc valve 66 at the time of opening in the extension stroke can be increased, and the oil liquid L can be sufficiently replenished from the reservoir chamber 18 to the second chamber 49 in the cylinder 17. .. Therefore, it is possible to suppress the initial delay of the damping force in the contraction stroke. Therefore, the ride quality of the vehicle equipped with the shock absorber 11 can be improved.

In addition, since the retainer 121 does not overlap with the tubular portion 84 in the axial direction, the inner peripheral end portion of the disc valve 66 can be lifted over the entire length of the tubular portion 84. As a result, the opening area of the disc valve 66 at the time of opening in the extension stroke can be further increased, and the oil liquid L can be further sufficiently replenished from the reservoir chamber 18 to the second chamber 49. Therefore, the initial delay of the damping force in the contraction stroke can be further suppressed. Therefore, the ride quality of the vehicle equipped with the shock absorber 11 can be further improved.

The first aspect of the embodiment described above is the pin member, the cylinder portion through which the pin member is inserted, the seat member having the inner seat portion and the outer seat portion, and the seat member mounted on the cylinder portion. A retainer having a diameter larger than the outer diameter of the cylinder portion, and a disc valve provided in contact with the inner seat portion and the outer seat portion and movable in the axial direction of the pin member along the outer circumference of the cylinder portion. A spring member that is mounted on the retainer and presses the disc valve toward the inner seat portion and the outer seat portion. Thereby, the valve opening characteristic of the disc valve can be easily adjusted.

In a second aspect, in the first aspect, the spring member includes a flat plate portion on the central side and a foot portion inclined from the flat plate portion toward the disc valve, and the retainer is provided with a foot portion. The outer diameter is smaller than that of the flat plate portion.

A third aspect is the pin member, the cylinder portion through which the pin member is inserted, the seat member having the inner seat portion and the outer seat portion, and the outer diameter of the cylinder portion placed on the cylinder portion. A large-diameter retainer, a disc valve provided in contact with the inner seat portion and the outer seat portion, and movable in the axial direction of the pin member along the outer periphery of the tubular portion, and mounted on the retainer. It is a method of manufacturing a shock absorber provided with a spring member that presses the disc valve toward the inner seat portion and the outer seat portion, and the disc valve can be used by properly using the retainers having different outer diameters. Change the amount of flexure. Thereby, the valve opening characteristic of the disc valve can be easily adjusted.

11 Buffer 25 Valve body (seat member)
66 Disc valve 68 Pin member 84 Cylindrical part 85 Inner seat part 86 Outer seat part 121 Retainer 122 Spring member 142 Flat plate part 143 Foot part

Claims (3)

With pin members
A sheet member having a tubular portion, an inner seat portion, and an outer seat portion through which the pin member is inserted,
A retainer having a diameter larger than the outer diameter of the cylinder portion placed on the cylinder portion,
A disc valve provided in contact with the inner seat portion and the outer seat portion and movable in the axial direction of the pin member along the outer circumference of the tubular portion.
A shock absorber having a spring member mounted on the retainer and pressing the disc valve toward the inner seat portion and the outer seat portion. The spring member includes a flat plate portion on the center side and a foot portion extending from the flat plate portion so as to be inclined toward the disc valve.
The shock absorber according to claim 1, wherein the retainer has an outer diameter smaller than that of the flat plate portion. With pin members
A sheet member having a tubular portion, an inner seat portion, and an outer seat portion through which the pin member is inserted,
A retainer having a diameter larger than the outer diameter of the cylinder portion placed on the cylinder portion,
A disc valve provided in contact with the inner seat portion and the outer seat portion and movable in the axial direction of the pin member along the outer circumference of the tubular portion.
A method of manufacturing a shock absorber comprising a spring member mounted on the retainer and pressing the disc valve toward the inner seat portion and the outer seat portion.
A method for manufacturing a shock absorber, which comprises changing the amount of flexibility of the disc valve by properly using the retainers having different outer diameters.

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