JP2019173800A - Cylinder device - Google Patents

Abstract

To provide a cylinder device which can optimize a valve characteristic.SOLUTION: A cylinder device comprises a valve 123 placed on a first seat part 77 and a second seat part 76, and opening and closing a flow passage 72, and a resistance member 145 located at a side in a direction in which the flow passage 72 of the valve 123 is opened. The resistance member 145 has a spring member 114, and a pressing member 113 which opposes the spring member 114 at one side face, opposes the valve 123 at the other side face, and is seated on either of the first seat part 77 and the second seat part 76 at the valve-closing of the valve 123. When a piston speed is low, the valve 123 separates from one of sides of a first seat part 77 and a second seat part 76 on which the pressing member 113 is not seated, and when the piston speed is higher than the low speed, the valve separates from the other of the sides of the first seat part 77 and the second seat part 76 on which the pressing member 113 is seated.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a cylinder device.

  Some cylinder devices include a valve member in which an inner seat portion and an outer seat portion are formed across a flow path, and a valve that is detachable from the outer seat portion and the inner seat portion (for example, Patent Documents). 1).

JP2013-249898A

  It is desired to optimize the valve characteristics.

  Therefore, an object of the present invention is to provide a cylinder device capable of optimizing valve characteristics.

  In order to achieve the above object, the present invention provides a first seat portion provided inside a flow path of a valve member, a second seat portion provided outside the flow path of the valve member, A valve mounted on the first seat portion and the second seat portion to open and close the flow path; and a restriction member positioned on a side of the valve in the direction of opening the flow path, wherein the restriction member is a spring member And one surface facing the spring member, the other surface facing the valve, and a pressure seated on either the first seat portion or the second seat portion when the valve is closed The valve is separated from one of the first seat portion and the second seat portion on the side where the pressing member is not seated when the piston speed is low, and the piston speed is lower than the low speed. When the first sheet is too fast And the pressing member is separated from the other side of the seating of the second sheet portion, and the configuration.

  According to the present invention, it is possible to optimize the valve characteristics.

It is sectional drawing which shows the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a top view which shows the body valve assembly of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the body valve assembly of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a disassembled perspective view which shows a part of body valve assembly of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a disassembled plan view which shows a part of body valve assembly of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a half sectional view for demonstrating the operating state of the valve mechanism of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a characteristic line figure which shows the characteristic of the valve mechanism of the cylinder apparatus of 1st Embodiment which concerns on this invention. It is a top view which shows the body valve assembly of the cylinder apparatus of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the body valve assembly of the cylinder apparatus of 2nd Embodiment which concerns on this invention. It is a disassembled perspective view which shows a part of body valve assembly of the cylinder apparatus of 2nd Embodiment which concerns on this invention. It is a disassembled top view which shows a part of body valve assembly of the cylinder apparatus of 2nd Embodiment which concerns on this invention. It is a half sectional view for demonstrating the operating state of the valve mechanism of the cylinder apparatus of 2nd Embodiment which concerns on this invention.

“First Embodiment”
A cylinder device according to a first embodiment of the present invention will be described below with reference to FIGS.

  The cylinder device 11 of the first embodiment is a shock absorber used for a suspension device of a vehicle such as an automobile or a railway vehicle. As shown in FIG. 1, the cylinder device 11 according to the first embodiment includes a cylindrical inner cylinder 12 and a reservoir between the inner cylinder 12 that is larger in diameter than the inner cylinder 12 and provided on the outer peripheral side of the inner cylinder 12. A cylinder 15 having a bottomed cylindrical outer cylinder 14 forming the chamber 13 is provided. A working liquid as a fluid is sealed in the inner cylinder 12, and a working liquid and a working gas as a fluid are sealed in the reservoir chamber 13 in the outer cylinder 14. That is, the cylinder device 11 has a cylinder 15 in which a fluid is sealed, and the cylinder 15 is a double cylinder type in which the inner cylinder 12 is provided in the outer cylinder 14.

  The outer cylinder 14 is an integrally molded product made of, for example, one member made of metal. The outer cylinder 14 has a cylindrical side wall portion 17 and a bottom portion 18 that closes one end side of the side wall portion 17 in the axial direction, and an opening 19 is provided on the side opposite to the bottom portion 18 of the side wall portion 17. . The central axes of the side wall portion 17 and the bottom portion 18 become the central axis of the outer cylinder 14. Note that the side wall portion 17 and the bottom portion 18 may be formed separately and joined to form the outer cylinder 14.

  The bottom portion 18 includes a tapered tubular portion 21 extending so as to be reduced in diameter from the end edge portion in the axial direction of the sidewall portion 17, and a side opposite to the sidewall portion 17 of the tapered tubular portion 21. And a flat disk portion 22 extending radially inward from the end edge portion. The tapered cylindrical portion 21 has a tapered shape centering on the central axis of the outer cylinder 14, and the disk portion 22 extends perpendicular to the central axis of the outer cylinder 14.

  The inner cylinder 12 is an integrally molded product made of a single metal member and has a cylindrical shape. The inner cylinder 12 has an opening 26 on one end side in the axial direction and an opening 27 on the other end side. The inner cylinder 12 is engaged with the bottom 18 of the outer cylinder 14 via an annular base member 30 (valve member) attached to the opening 26 side at one end in the axial direction. Further, the inner cylinder 12 is engaged with the side opposite to the bottom 18 of the side wall 17 of the outer cylinder 14 via an annular rod guide 31 attached to the opening 27 side at the other end in the axial direction. . The opening 27 of the inner cylinder 12 is closer to the bottom 18 than the opening 19 of the outer cylinder 14, so that the opening 19 of the outer cylinder 14 becomes the opening 19 of the cylinder 15.

  The base member 30 is fitted in the cylinder 15 by being placed on the bottom 18 of the outer cylinder 14 in a state of being fitted and fixed to the inner peripheral part of the inner cylinder 12 on the opening 26 side. Thus, the taper cylindrical portion 21 of the bottom portion 18 is positioned in the radial direction. As a result, the base member 30 is arranged coaxially with the outer cylinder 14, and as a result, one end of the inner cylinder 12 in the axial direction is arranged coaxially with the outer cylinder 14.

  The rod guide 31 is provided on the opening 19 side of the cylinder 15. The rod guide 31 is fitted to the inner peripheral part on the opening 27 side of the inner cylinder 12 and the inner peripheral part on the opening 19 side of the side wall part 17 of the outer cylinder 14, whereby the other end part in the axial direction of the inner cylinder 12. Is arranged coaxially with the outer cylinder 14.

  An annular seal member 33 is disposed on the opposite side of the rod guide 31 from the bottom portion 18, and this seal member 33 is also fitted to the inner peripheral portion of the side wall portion 17 on the opening 19 side. On the side of the opening 19 of the side wall portion 17, a caulking portion 34 that is plastically deformed radially inward by curling is formed, and the seal member 33 is sandwiched between the caulking portion 34 and the rod guide 31. Has been. The seal member 33 seals the opening 19 side of the outer cylinder 14.

  A piston 35 is slidably fitted in the inner cylinder 12. The piston 35 defines a first chamber 36 and a second chamber 37 in the inner cylinder 12. In other words, the piston 35 partitions the inside of the cylinder 15 into at least two chambers of the first chamber 36 and the second chamber 37. The first chamber 36 is provided between the piston 35 in the inner cylinder 12 and the rod guide 31, and the second chamber 37 is provided between the piston 35 in the inner cylinder 12 and the base member 30.

  The second chamber 37 in the inner cylinder 12 is defined as the reservoir chamber 13 by a base member 30 provided on one end side of the inner cylinder 12. In other words, the base member 30 partitions the inside of the cylinder 15 into at least two chambers of the second chamber 37 and the reservoir chamber 13. The first chamber 36 and the second chamber 37 are filled with an oil liquid as a working liquid, and the reservoir chamber 13 is filled with a gas as a working gas and an oil liquid as a working liquid.

  The piston 35 has an annular shape, and a rod 38 is inserted on the inner peripheral side thereof. The piston 35 is connected to the rod 38 by a nut 39 that is screwed to the rod 38. The rod 38 extends from the cylinder 15 to the outside through the rod guide 31 and the seal member 33. Thus, one end of the rod 38 extends to the outside of the cylinder 15, and the other end side is disposed in the cylinder 15 and connected to the piston 35.

  The rod 38 has an attachment shaft portion 41 to which the piston 35 and the nut 39 are attached, and a main shaft portion 42 having a larger diameter than the attachment shaft portion 41 and slidably fitted to the rod guide 31 and the seal member 33. is doing. The rod 38 has a mounting shaft portion 41 disposed in the cylinder 15 and a main shaft portion 42 extending from the cylinder 15 to the outside. A male screw 43 into which a nut 39 is screwed is formed at the end of the mounting shaft 41 opposite to the main shaft 42.

  The main shaft 42 is guided by the rod guide 31 and the rod 38 moves in the axial direction integrally with the piston 35 with respect to the cylinder 15. In other words, the rod guide 31 guides the axial movement of the rod 38. The seal member 33 closes the space between the outer cylinder 14 and the rod 38 and restricts the working liquid in the inner cylinder 12 and the working gas and working liquid in the reservoir chamber 13 from leaking to the outside.

  A flow path 44 and a flow path 45 penetrating in the axial direction are formed in the piston 35. The flow path 44 is provided on the radially outer side of the piston 35, that is, on the outer peripheral side with respect to the flow path 45. The flow paths 44 and 45 can communicate the first chamber 36 and the second chamber 37. The piston 35 is provided with a disk valve 46 capable of closing the flow path 44 and a disk valve 47 capable of closing the flow path 45.

  The piston 35 is provided on the rod guide 31 side with an outer sheet portion 51 provided on the radially outer side of the flow path 44 and on the radially inner side of the flow path 44 and on the radially outer side of the flow path 45. An intermediate sheet portion 52 and an inner sheet portion 53 provided on the radially inner side of the flow path 45 are formed. In addition, the piston 35 is formed with an outer sheet portion 65 provided radially outside the flow path 45 and an inner sheet portion 66 provided radially inward of the flow path 45 on the base member 30 side. ing.

  The piston 35 is provided with an annular disk valve 46 on the rod guide 31 side which can close the flow path 44 between the outer sheet portion 51 and the intermediate sheet portion 52 by contacting the piston 35. . In other words, the disc valve 46 is placed on the outer seat portion 51 and the intermediate seat portion 52 and opens and closes the flow path 44. The disc valve 46 is an annular plate member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion.

  On the rod guide 31 side of the disc valve 46, that is, on the side in which the flow path 44 is opened, a resistance member 55 serving as a resistance for opening the disc valve 46 is provided. The resistance member 55 is overlapped on the opposite side of the disk valve 46 of the small-diameter disk 56 and the annular small-diameter disk 56 having the same outer diameter as the inner seat part 53, which sandwiches the disk valve 46 with the inner seat part 53. A spring member 57 that contacts the disc valve 46 and presses the disc valve 46 in the direction of closing the flow path 44, and is overlapped on the opposite side of the small-diameter disc 56 of the spring member 57, and exceeds a predetermined amount of the disc valve 46 It has the regulating member 58 which regulates valve opening.

  The small-diameter disk 56 is an annular plate member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion. The spring member 57 is an annular plate-like member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion. The regulating member 58 is an annular plate-like member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion.

  The piston 35 has an annular disk valve 47 that can close the flow path 45 between the outer seat portion 65 and the inner seat portion 66 by contacting the outer seat portion 65 and the inner seat portion 66. Is provided. The disk valve 47 is configured by stacking a plurality of single disks that are plate-like members. These single discs have an annular shape, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion.

  The disk valve 47 contacts the outer seat portion 65 and the inner seat portion 66 to close the flow path 45, and is spaced from the outer seat portion 65 to open the flow path 45. In other words, the disc valve 47 is placed on the outer seat portion 65 and the inner seat portion 66 and opens and closes the flow path 45.

  On the side of the base member 30 in the axial direction of the disc valve 47, a small-diameter disc 61 having a smaller diameter than the outer diameter of the disc valve 47 is provided. The small-diameter disk 61 is an annular plate-like member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion.

  On the opposite side of the small-diameter disc 61 from the disc valve 47 in the axial direction, there is provided a contact disc 62 that comes into contact with the disc valve 47 when the disc valve 47 is deformed by a predetermined amount or more. The contact disk 62 is an annular plate-like member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion.

  On the opposite side of the abutting disc 62 from the small-diameter disc 61 in the axial direction, a regulating member 63 that regulates the disc valve 47 from being deformed by a predetermined amount or more with the abutting disc 62 is provided. The regulating member 63 is an annular plate-like member, and the mounting shaft portion 41 of the rod 38 is fitted to a circular inner peripheral portion. A nut 39 is disposed on the side of the restricting member 63 opposite to the contact disk 62 in the axial direction. The restricting member 63 is in contact with the nut 39.

  In the disc valve 46, the rod 38 moves to the contraction side to increase the amount of entry into the inner cylinder 12 and the outer cylinder 14, and the piston 35 moves in a direction to narrow the second chamber 37, so that the pressure in the second chamber 37 is the first. When the pressure is higher than the pressure in the chamber 36 by a predetermined value or more, the flow path 44 is opened away from the outer sheet portion 51 and the intermediate sheet portion 52. As a result, an oil liquid as a fluid is circulated through the flow path 44 from the second chamber 37 side toward the first chamber 36 side. Therefore, fluid flows through the flow path 44 provided in the piston 35 when the rod 38 and the piston 35 move to the contraction side.

  The disc valve 46, the outer seat portion 51, the intermediate seat portion 52 and the flow path 44 of the piston 35, and the spring member 57 are oils from the second chamber 37 side to the first chamber 36 side through the flow path 44. A valve mechanism 68 that allows the liquid to flow and restricts the flow of the oil from the first chamber 36 side to the second chamber 37 side through the flow path 44 is configured.

  In the disc valve 47, the rod 38 moves to the extending side to increase the amount of protrusion from the inner cylinder 12 and the outer cylinder 14, and the piston 35 moves in the direction of narrowing the first chamber 36, so that the pressure in the first chamber 36 becomes the second chamber. When it becomes higher than the pressure of 37 by a predetermined value or more, the flow path 45 is opened away from the outer sheet portion 65. As a result, an oil liquid as a fluid is circulated in the flow path 45 from the first chamber 36 side to the second chamber 37 side, and a damping force is generated at that time. Therefore, fluid flows through the flow path 45 provided in the piston 35 when the rod 38 and the piston 35 move to the extension side.

  The disc valve 47, the outer seat portion 65 of the piston 35 and the flow path 45 allow the oil liquid to flow from the first chamber 36 side to the second chamber 37 side via the flow path 45. The valve mechanism 69 which restrict | limits the distribution | circulation of the oil liquid from the 2nd chamber 37 side to the 1st chamber 36 side via this is comprised. The valve mechanism 69 is a damping valve that generates a damping force when fluid is circulated through the flow path 45.

  The base member 30 has a step shape in which one side in the axial direction has a smaller diameter than the other side. The base member 30 has a large-diameter side positioned in contact with the bottom 18 of the outer cylinder 14 in a radial direction, and a small-diameter side is fitted to the inner peripheral part of the inner cylinder 12 on the opening 26 side. The base member 30 is fixed in position relative to the cylinder 15 and is disposed on the bottom side opposite to the axial opening 19 in the cylinder 15.

  2 and 3 show the body valve assembly 70 including the base member 30. FIG. As shown in FIG. 3, the base member 30 has a fitting hole 71 penetrating in the axial direction formed in the center in the radial direction, and has an annular shape. The base member 30 includes a plurality of flow paths 72 that pass through the base member 30 in the axial direction, and a plurality of flow paths 73 that pass through the base member 30 in the axial direction. Is formed. The channel 72 is disposed outside the channel 73 in the radial direction of the base member 30. These flow paths 72 and 73 provided in the base member 30 can communicate the second chamber 37 and the reservoir chamber 13 shown in FIG.

  An outer sheet portion 76 (second sheet portion), an intermediate sheet portion 77 (first sheet portion), and an inner sheet portion 78 are formed at the end of the base member 30 on the piston 35 side in the axial direction. As shown in FIGS. 3 to 5, the outer sheet portion 76 is formed in an annular shape outside the flow path 72 in the radial direction of the base member 30. The intermediate sheet portion 77 is formed in an annular shape inside the flow path 72 in the radial direction of the base member 30 and outside the flow path 73. In other words, the intermediate sheet portion 77 is provided between the flow path 72 and the flow path 73 in the radial direction of the base member 30. The inner sheet portion 78 is formed in an annular shape inside the flow path 73 in the radial direction of the base member 30 and radially outside the fitting hole 71. In other words, the inner sheet portion 78 is provided between the flow path 73 and the fitting hole 71 in the radial direction of the base member 30.

  As shown in FIG. 1, an outer sheet portion 81 and an inner sheet portion 82 are formed on the side of the base member 30 opposite to the piston 35 in the axial direction. The outer sheet portion 81 is formed in an annular shape inside the channel 72 in the radial direction of the base member 30 and outside the channel 73. The inner sheet portion 82 is formed in an annular shape radially inward of the flow path 73 in the radial direction of the base member 30 and radially outward of the fitting hole 71.

  On the side opposite to the piston 35 in the axial direction of the base member 30, an annular foot portion that protrudes radially outward from the outer seat portion 81 and protrudes to the opposite side of the piston 35 from the outer seat portion 81 in the axial direction. 83 is formed. The foot portion 83 is formed with a passage groove 84 that penetrates the foot portion 83 in the radial direction. The base member 30 comes into contact with the bottom 18 of the outer cylinder 14 at the foot 83. The flow paths 72 and 73 can communicate with the second chamber 37 and the reservoir chamber 13 via the passage groove 84.

  As shown in FIG. 3, the base member 30 is fitted in the shaft portion 87 of the screw member 86 in the fitting hole 71. The screw member 86 has a head 88 having a larger diameter than the shaft 87 on one end in the axial direction of the shaft 87, and a male screw 89 on the other end opposite to the head 88 of the shaft 87. Is formed. A nut 90 is screwed onto the male screw 89.

  A disk valve 101 is disposed on the outer seat 81 and the inner seat 82 side in the axial direction of the base member 30. The disk valve 101 is configured by stacking a plurality of single disks 102 that are plate-like members. These single disks 102 have an annular shape, and a shaft portion 87 of a screw member 86 is fitted to a circular inner peripheral portion.

  In the disc valve 101, the single disc 102 on the outermost seat portion 81 and the inner seat portion 82 side abuts on the outer seat portion 81 and the inner seat portion 82 to close the flow path 73, and flows away from the outer seat portion 81. Open path 73. That is, the disc valve 101 opens and closes the flow path 73.

  On the opposite side of the disc valve 101 in the axial direction from the outer seat portion 81 and the inner seat portion 82, a small-diameter disc 105 having an outer diameter smaller than the outer diameter of the disc valve 101 is provided. The small-diameter disk 105 is an annular plate member, and a shaft portion 87 of a screw member 86 is fitted to a circular inner peripheral portion.

  On the opposite side of the small-diameter disk 105 from the disk valve 101 in the axial direction, a regulating member 106 that regulates deformation of the disk valve 101 by a predetermined amount or more is provided. The regulating member 106 is an annular plate-like member, and the shaft portion 87 of the screw member 86 is fitted to a circular inner peripheral portion. A head portion 88 of a screw member 86 is disposed on the opposite side of the restricting member 106 from the small-diameter disk 105 in the axial direction. The restricting member 106 is in contact with the head 88.

  A valve plate 110, which is a plate-like member, is provided on the side of the base member 30 in the axial direction of the outer seat portion 76, the intermediate seat portion 77 and the inner seat portion 78. A plurality of, more specifically, two washers 111 are arranged on the opposite side of the valve plate 110 from the base member 30. A small-diameter washer 112 is disposed on the side of the washer 111 opposite to the valve plate 110. The washer 111 and the small-diameter washer 112 are arranged on the inner side in the radial direction, and the pressing member 113 is arranged on the side opposite to the base member 30 of the valve plate 110. A spring member 114 is disposed on the opposite side of the small diameter washer 112 and the pressing member 113 from the valve plate 110. A washer 115 is disposed on the side of the spring member 114 opposite to the small diameter washer 112, and the nut 90 described above is disposed on the side of the washer 115 opposite to the spring member 114. The washer 115 is in contact with the nut 90.

  In other words, the valve plate 110, the two washers 111, the small diameter washer 112, the spring member 114, the washer 115, and the nut 90 are stacked on the base member 30 in this order. Further, on the base member 30, a valve plate 110, a pressing member 113, a spring member 114, a washer 115, and a nut 90 are stacked in this order.

  The valve plate 110 is formed by stamping a single elastic metal plate by press molding, and has a flat plate shape. As shown in FIGS. 4 and 5, the valve plate 110 includes an annular fixed portion 122, an annular valve portion 123 (valve) having an inner diameter larger than the outer diameter of the fixed portion 122, and The fixing part 122 and the valve part 123 are composed of two support parts 124 connected in a concentric state.

  The two support parts 124 are connected to the valve part 123 at an outer connection part 126 arranged at a distance in the circumferential direction of the valve plate 110 on the same side from the center in the radial direction of the valve plate 110. Yes. In addition, the two support portions 124 are connected to the fixed portion 122 at an inner connection portion 127 arranged at a distance in the circumferential direction of the valve plate 110 on the opposite side of the center in the radial direction of the valve plate 110. Has been. Further, the two support portions 124 have arcuate connecting arm portions 128 that connect the outer connection portion 126 and the inner connection portion 127 on the side closer to the valve plate 110 in the circumferential direction. In other words, with respect to the center of the valve plate 110, two outer connection portions 126 are provided on the same one side in the radial direction of the valve plate 110, and two inner connection portions 127 are provided on the same opposite side, respectively. A connecting arm portion 128 is provided so as to connect the outer connection portion 126 and the inner connection portion 127 close to the circumferential direction of the valve plate 110. The interval between the two inner connection portions 127 in the circumferential direction of the valve plate 110 is wider than the interval between the two outer connection portions 126.

  In each of the two support portions 124, the outer connection portion 126 protrudes from the inner peripheral portion of the valve portion 123 to the front of the fixing portion 122 substantially along the radial direction of the valve plate 110, and the inner connection portion 127 is It protrudes from the outer peripheral part of the fixed part 122 to the front of the valve part 123 substantially along the radial direction of the valve plate 110, and the connecting arm part 128 connects these tips. The connecting arm portion 128 is formed between the inner peripheral portion of the valve portion 123 and the outer peripheral portion of the fixed portion 122 and has an arc shape along the outer peripheral portion of the fixed portion 122. The connecting arm portion 128 has a diameter from the inner peripheral portion of the valve portion 123 and the outer peripheral portion of the fixed portion 122. Arranged at equidistant positions in the direction.

  As shown in FIG. 3, the valve plate 110 has the shaft portion 87 of the screw member 86 fitted to the circular inner peripheral portion of the fixed portion 122. The support portion 124 positions the valve portion 123 in the radial direction with respect to the fixed portion 122, that is, the shaft portion 87 of the screw member 86. In the valve plate 110, the outer diameter of the fixed portion 122 is substantially the same as the outer diameter of the inner seat portion 78 and the outer diameter of the washer 111. The fixed portion 122 is sandwiched between the inner seat portion 78 and the washer 111. The The inner diameter of the connecting arm portion 128 is larger than the outer diameter of the inner sheet portion 78 and the outer diameter of the washer 111.

  In the valve plate 110, the outer diameter of the valve portion 123 is slightly larger than the outer diameter of the outer seat portion 76, and the inner diameter of the valve portion 123 is slightly smaller than the inner diameter of the intermediate seat portion 77. It has become. Therefore, the valve portion 123 is in contact with the outer seat portion 76 at the outer peripheral annular contact portion 129 on the outer peripheral side, and at the same time, the intermediate seat portion 77 is connected with the inner peripheral contact portion 130 on the inner peripheral side. To close the outer flow path 72.

  Further, for example, the valve plate 110 separates the valve portion 123 from the outer seat portion 76 and the intermediate seat portion 77 by elastically deforming the two support portions 124 between the fixing portion 122 and the valve portion 123. That is, the valve plate 110 is placed on the intermediate seat portion 77 and the outer seat portion 76 and opens and closes the flow path 72. The valve portion 123 can be separated from the outer seat portion 76 and the intermediate seat portion 77 by elastically deforming itself.

  When the rod 38 shown in FIG. 1 moves to the expansion side, the piston 35 moves to the first chamber 36 side, and the pressure in the second chamber 37 falls below a predetermined value, the valve plate 123 shown in FIG. The flow path 72 is opened away from the sheet portion 76 and the intermediate sheet portion 77. Thereby, in the outer flow path 72 provided in the base member 30, when the rod 38 moves to the extension side, the fluid flows from the reservoir chamber 13 toward the second chamber 37, and the valve plate 110 This is a disk valve on the extension side that opens and closes the flow path 72.

  As shown in FIGS. 4 and 5, the washer 111 is an annular plate-like member, and as shown in FIG. 3, the shaft portion 87 of the screw member 86 is fitted to the circular inner peripheral portion. The two washers 111 have the same outer diameter and the same inner diameter. As shown in FIGS. 4 and 5, the small-diameter washer 112 is an annular plate-like member. As shown in FIG. 3, the shaft portion 87 of the screw member 86 is fitted to the circular inner peripheral portion. . The small-diameter washer 112 has an outer diameter slightly smaller than the outer diameter of the washer 111, and the inner diameter is the same as that of the washer 111.

  As shown in FIGS. 4 and 5, the pressing member 113 has a perforated disk shape, and the outer peripheral portion of the main plate portion 131 as shown in FIG. 3 and the flat main plate portion 131 having a circular outer peripheral portion. And an annular pressing input portion 132 protruding to one side in the axial direction. The press input part 132 is continuously formed over the entire circumference of the outer peripheral part of the main plate part 131. As shown in FIGS. 4 and 5, the main plate portion 131 is formed with a deformed hole 135 at the center. The deformed hole 135 includes an inner peripheral edge portion 136 disposed on a circle coaxial with the outer peripheral portion of the main plate portion 131, and a plurality of circular holes protruding radially inward from the circumferentially equidistant positions of the inner peripheral edge portion 136, Specifically, it has four projecting edges 137. The tips of the protruding edge portions 137 are arranged on a circle coaxial with the outer peripheral portion of the main plate portion 131.

  As shown in FIG. 3, a plurality of washers 111 are disposed inside the distal end portions of the plurality of protruding edge portions 137 of the pressing member 113. The pressing member 113 is guided by the plurality of washers 111 and moves in the axial direction, and the movement in the radial direction is restricted by the plurality of washers 111 at that time. In other words, the pressing member 113 slides on the outer peripheral surfaces of the plurality of washers 111 in a state where movement in the radial direction is restricted. The thickness of the pressing member 113 is thinner than the total thickness of the plurality of washers 111. The pressing member 113 is thicker than the valve plate 110, has a higher rigidity than the valve plate 110, and is difficult to deform.

  The pressing input portion 132 has an outer diameter that is substantially the same as the outer diameter of the valve portion 123 of the valve plate 110, and an inner diameter that is larger than the inner diameter of the valve portion 123. The pressing input portion 132 overlaps the outer peripheral side contact portion 129 of the valve portion 123 in the radial direction and contacts the outer peripheral side contact portion 129. The pressing input portion 132 has an outer diameter that is substantially the same as the outer diameter of the outer sheet portion 76, and an inner diameter that is substantially the same as the inner diameter of the outer sheet portion 76 and is larger than the outer diameter of the intermediate sheet portion 77. It is a diameter.

  Therefore, when the valve plate 110 is in contact with both the outer seat portion 76 and the intermediate seat portion 77, the pressing member 113 comes into contact with the outer peripheral side contact portion 129 of the valve portion 123 in the press input portion 132, and the outer peripheral side. It sits on the outer seat portion 76 via the contact portion 129. The pressing member 113 does not come into contact with the inner peripheral side contact portion 130 of the valve portion 123 when the valve plate 110 is in contact with both the outer seat portion 76 and the intermediate seat portion 77, and the intermediate seat. It does not sit on the part 77. In other words, the pressing member 113 can contact only the outer peripheral side contact portion 129 of the outer peripheral side contact portion 129 and the inner peripheral side contact portion 130 of the valve portion 123, and the outer sheet portion 76 and the intermediate seat. Only the outer seat portion 76 of the portion 77 can be seated. In other words, the pressing member 113 can contact only the outer peripheral side contact portion 129 in the entire range of the valve portion 123.

  The pressing member 113 causes the spring load of the spring member 114 to act on the outer peripheral side contact portion 129 of the valve portion 123 of the valve plate 110. The valve portion 123 receives the spring load of the spring member 114 via the pressing member 113 to the outer peripheral side contact portion 129, and is supported using this load input point as a fulcrum.

  The spring member 114 presses the pressing member 113 and applies a predetermined set load to the valve portion 123 of the valve plate 110 via the pressing member 113. The spring member 114 and the pressing member 113 cause the valve plate 110 to flow in the state in which the valve plate 110 is in contact with the outer seat portion 76 and the intermediate seat portion 77 at the outer peripheral contact portion 129 and the inner peripheral contact portion 130. The path 72 is urged to be kept closed.

  As shown in FIGS. 4 and 5, the spring member 114 is an elastic plate-like member and has a substrate portion 141 made of a flat plate formed in an annular shape. The spring member 114 has a plurality of, specifically five, spring leg portions 142 that extend radially outward from circumferentially equidistant positions on the outer peripheral side of the substrate portion 141. The spring leg portion 142 is slightly bent toward one side in the axial direction of the substrate portion 141 with the base end side as a base point with respect to the substrate portion 141, and from the substrate portion 141 toward the extending distal end side that is radially away from the substrate portion 141. It is inclined so as to be separated to one side in the axial direction. Therefore, the spring member 114 is provided with a plurality of spring legs 142 extending in the radial direction from the flat plate-like substrate portion 141 on the outer peripheral side and bending toward the one axial side with respect to the substrate portion 141 in the circumferential direction. ing.

  As shown in FIG. 3, the spring member 114 has the shaft portion 87 of the screw member 86 fitted to the circular inner peripheral portion of the substrate portion 141, and overlaps the small diameter washer 112 in the substrate portion 141. At this time, the spring member 114 is set in a direction in which the spring leg portion 142 extends toward the pressing member 113 in the axial direction with respect to the base plate portion 141, and the spring leg portion 142 comes into contact with the pressing member 113. Therefore, a plurality of spring legs 142 extending in the radial direction from the base plate portion 141 and being bent toward the pressing member 113 are provided on the outer peripheral side of the spring member 114 in the circumferential direction.

  As shown in FIG. 2, each of the plurality of spring legs 142 is in contact with the radially outer side of the inner peripheral edge 136 of the main plate 131 of the pressing member 113. Therefore, all the spring leg portions 142 of the spring member 114 abut on the main plate portion 131 regardless of the phase relationship (circumferential positional relationship) with the pressing member 113.

  As shown in FIGS. 4 and 5, the washer 115 is an annular plate-like member, and as shown in FIG. 3, the shaft portion 87 of the screw member 86 is fitted to the circular inner peripheral portion. The washer 115 has an outer diameter that is substantially the same as the outer diameter of the substrate portion 141 of the spring member 114, and sandwiches the substrate portion 141 with the small diameter washer 112.

  While the shaft portion 87 is inserted into the head portion 88 of the screw member 86, the restricting member 106, the small-diameter disc 105, the plural single discs 102 constituting the disc valve 101, the base member 30, and the valve plate 110 are provided. Stack in this order. Then, a plurality of washers 111, a small diameter washer 112, and a pressing member 113 are stacked on the valve plate 110 while the shaft portion 87 is inserted inside, and a spring member 114 is stacked on the small diameter washer 112 and the pressing member 113. The washers 115 are stacked and the nut 90 is screwed onto the male screw 89.

  Thus, the head 88 of the screw member 86 and the inner sheet portion 82 of the base member 30 allow the inner peripheral side of the restricting member 106, the small diameter disk 105, and the inner peripheral side of each of the plurality of single disks 102 to be axial. It will be clamped. In addition, the inner seat portion 78 and the nut 90 of the base member 30 clamp the fixing portion 122 of the valve plate 110, the plurality of washers 111, the small diameter washer 112, the substrate portion 141 of the spring member 114, and the washer 115 in the axial direction. It will be. At this time, although the pressing member 113 is sandwiched between the plurality of spring legs 142 of the spring member 114 and the valve plate 110, the pressing member 113 is not clamped in the axial direction, and is deformed in the axial direction while deforming the spring leg 142. It becomes movable.

  In the valve plate 110 in a state where the fixing portion 122 is clamped as described above, the fixing portion 122 is fixed to the base member 30, the outer peripheral side contact portion 129 of the valve portion 123 is in contact with the outer seat portion 76, At the same time, the inner peripheral contact portion 130 contacts the intermediate sheet portion 77 and closes the outer flow path 72. The valve plate 110 is axially connected by connecting a fixed portion 122 fixed to the base member 30 and a valve portion 123 that opens and closes the flow path 72 by a pair of support portions 124 extending in the circumferential direction. The bending rigidity is kept low. As a result, the valve plate 110 suppresses the influence on the bending of the valve portion 123 due to the fixing portion 122 being fixed.

  A plurality of washers 111, a small-diameter washer 112, a pressing member 113, and a spring member 114 are positioned on the side in which the flow path 72 of the valve plate 110 is opened, and constitute a resistance member 145 that serves as a valve opening resistance of the valve plate 110. Yes. The pressing member 113 has one surface facing the spring member 114 and the other surface facing the valve plate 110, and when the valve plate 110 is closed, one of the outer seat portion 76 and the intermediate seat portion 77. Is seated on the outer seat 76. The resistance member 145 applies a predetermined set load by the spring member 114 to the outer peripheral side contact portion 129 of the valve plate 110 via the pressing member 113.

  The screw member 86, the regulating member 106, the small-diameter disk 105, the plurality of single disks 102 constituting the disk valve 101, the base member 30, the valve plate 110, and the plurality of washers 111 integrally assembled as described above. The small-diameter washer 112, the pressing member 113, the spring member 114, the washer 115, and the nut 90 constitute the body valve assembly 70.

  As shown in FIG. 1, the disc valve 101 disposed on the opposite side of the base member 30 from the axial piston 35 moves in a direction in which the rod 38 moves to the contraction side and the piston 35 narrows the second chamber 37. When the pressure in the second chamber 37 becomes higher than the pressure in the reservoir chamber 13 by a predetermined value or more, the channel 73 is opened away from the outer sheet portion 81, and the reservoir chamber is opened from the second chamber 37 side to the channel 73. An oil liquid as a fluid is circulated on the side 13 and a damping force is generated at that time. Therefore, the fluid flows through the flow path 73 provided in the base member 30 when the rod 38 and the piston 35 move.

  The disc valve 101, the outer sheet portion 81 of the base member 30, and the flow path 73 allow the oil liquid to flow from the second chamber 37 side to the reservoir chamber 13 side via the flow path 73. The valve mechanism 147 is configured to restrict the flow of the oil from the reservoir chamber 13 side to the second chamber 37 side via the. The valve mechanism 147 is a damping valve that generates a damping force when fluid is circulated through the flow path 73.

  The valve plate 110 disposed on the side of the piston 35 in the axial direction of the base member 30 moves in a direction in which the rod 38 moves to the extension side and the piston 35 expands the second chamber 37, so that the pressure in the second chamber 37 is changed to the reservoir chamber. When the pressure is lower than a predetermined value by 13 or more, the flow path 72 is opened apart from the outer sheet portion 76 and the intermediate sheet portion 77, and the flow path 72 is moved from the reservoir chamber 13 side to the second chamber 37 side. Distribute oil as a fluid. Accordingly, the fluid flows through the flow path 72 provided in the base member 30 when the rod 38 and the piston 35 move.

  The valve plate 110, the resistance member 145, the outer sheet portion 76, the intermediate sheet portion 77, and the flow path 72 of the base member 30 are oil from the reservoir chamber 13 side to the second chamber 37 side through the flow path 72. A valve mechanism 148 that allows the liquid to flow and restricts the flow of the oil from the second chamber 37 side to the reservoir chamber 13 side through the flow path 72 is configured. The valve mechanism 148 opens the flow path 72 when the rod 38 moves to the extension side, the piston 35 moves to the first chamber 36 side, and the pressure in the second chamber 37 falls below the pressure in the reservoir chamber 13. At this time, the suction valve flows the working liquid from the reservoir chamber 13 into the second chamber 37.

  As shown in FIG. 3, in the valve plate 110, the outer peripheral contact portion 129 of the valve portion 123 contacts the outer seat portion 76, and the inner peripheral contact portion 130 of the valve portion 123 contacts the intermediate seat portion 77. When the valve 72 is closed, the outer peripheral side contact portion 129 of the valve portion 123 is pressed against the outer seat portion 76 via the pressing member 113 by the urging force of the spring member 114. On the other hand, at this time, since the inner peripheral contact portion 130 of the valve portion 123 does not contact the pressing member 113, the force pressed against the intermediate seat portion 77 by the urging force of the spring member 114 becomes substantially zero. Therefore, the valve portion 123 of the valve plate 110 is more easily opened by the inner peripheral contact portion 130 that contacts the intermediate seat portion 77 than the outer peripheral contact portion 129 that contacts the outer seat portion 76. Yes.

  Next, the operation of the first embodiment will be described mainly based on FIGS. 7 is the characteristic of the first embodiment, and the broken line X2 shown in FIG. 7 is the characteristic of the comparative structure. This comparative structure is a structure in which the radial intermediate position of the valve portion 123 of the first embodiment is directly pressed by the spring member 114. With such a comparison structure, the spring force of the spring member acts on both the inner peripheral side and the outer peripheral side of the valve portion. For this reason, when the oil liquid flows into the second chamber from the reservoir chamber in the extension stroke, the sufficient flow rate in the high piston region is compensated while setting a high gradient of the pressure difference with respect to the flow rate at the low piston speed. Has become difficult. 7 indicates the pressure compensation limit value P of the valve portion 123.

  First, when the pressure in the second chamber 37 and the pressure in the reservoir chamber 13 are equal, the valve plate 123 has the valve portion 123 simultaneously with the outer seat portion 76 and the intermediate seat portion 77 as shown in FIG. The outer flow path 72 is closed by contacting.

  In the extension stroke in which the rod 38 moves to the extension side and the piston 35 moves to the first chamber 36 side, the pressure in the second chamber 37 falls below the pressure in the reservoir chamber 13. At this time, if the piston speed, which is the moving speed of the rod 38 and the piston 35, is in the low speed operation range (0 to v1) shown in FIG. 7, the flow rate of the oil flowing from the reservoir chamber 13 to the second chamber 37 is small. In this state, the valve portion 123 of the valve mechanism 148 is pressed against the outer seat portion 76 by the pressing input portion 132 of the pressing member 113 whose outer peripheral contact portion 129 is pressed by the biasing force of the spring member 114. If the pressure receiving area × pressure difference ≦ set load, the valve mechanism 148, as shown in FIG. 6 (b), is bent on the inner circumferential side abutting portion 130 side where the valve portion 123 is not pressed by the pressing input portion 132. The oil sheet is opened from the intermediate sheet portion 77 through the gap and the flow path 72 to flow from the reservoir chamber 13 to the second chamber 37.

  That is, in the valve portion 123, when the piston speed is low, the inner peripheral contact portion 130 is separated from the intermediate seat portion 77 on the side where the pressing member 113 is not seated in the outer seat portion 76 and the intermediate seat portion 77. At this time, in the valve portion 123, the inner peripheral contact portion 130 is on the opposite side in the radial direction from the outer peripheral contact portion 129 where the biasing force of the spring member 114 acts most strongly, and the biasing force of the spring member 114. Since it is least effective, it is easily separated from the intermediate seat portion 77, and the valve opening pressure of the valve mechanism 148 becomes low.

  Further, when the valve portion 123 is separated from the intermediate seat portion 77, the valve portion 123 bends with the outer peripheral side abutting portion 129 sandwiched between the pressing input portion 132 and the outer seat portion 76 as described above, and only the intermediate seat portion 77 side is bent. Opens. At this time, the pressure receiving area of the valve portion 123 is an annular area between the outer seat portion 76 and the intermediate seat portion 77, and the distance between the outer seat portion 76 and the intermediate seat portion 77 is short. The spring constant increases. As the spring constant increases, the gradient of the pressure difference with respect to the flow rate can be increased. As a result, the rate of increase of the differential pressure before and after the valve portion 123 with respect to the increase of the piston speed in the low speed operation range (0 to v1) can be made larger than the characteristic of the comparative structure indicated by the broken line X2 in FIG. Therefore, the differential pressure of the valve portion 123 at the same piston speed is higher than that of the comparative structure.

  When the piston speed is in the middle to high speed operation range (v1) higher than the low speed operation range (0 to v1) as described above, the flow rate of the oil liquid flowing from the reservoir chamber 13 to the second chamber 37 is increased. Accordingly, the pressure difference acting on the pressure receiving portion of the valve portion 123 increases, and when the pressure receiving area × pressure difference> set load, as shown in FIG. In addition to the separation of the contact portion 130 from the intermediate seat portion 77, the outer peripheral side contact portion 129 of the valve portion 123 pushes up the pressing member 113 against the biasing force of the spring member 114, and the spring of the spring member 114. The leg portion 142 is separated from the outer sheet portion 76 while being deformed.

  That is, when the piston speed is higher than the low speed, the valve portion 123 is separated from the outer seat portion 76 and the intermediate seat portion 77 on the side on which the pressing member 113 is seated. In other words, when the fluid force acting on the valve portion 123 exceeds the set load of the valve portion 123 by the spring member 114, the valve portion 123 is separated from both the intermediate seat portion 77 and the outer seat portion 76. As a result, the outer periphery side contact portion 129 and the inner periphery side contact portion 130 of the valve portion 123 are separated from the outer seat portion 76 and the intermediate seat portion 77, resulting in a large opening area, and the sensitivity of the valve opening area to the pressure difference is increased. By doing so, the apparent spring constant of the valve portion 123 is lowered, and a large opening area can be secured. Therefore, the gradient of the pressure difference of the valve part 123 with respect to the flow rate is reduced, and the oil liquid can be flowed from the reservoir chamber 13 to the second chamber 37 with a relatively small pressure difference.

  That is, as shown in FIG. 7, the valve with respect to the increase in the piston speed in the medium and high speed operation region (v1) rather than the increasing rate of the differential pressure of the valve portion 123 with respect to the increase in the piston speed in the low speed operation region (0 to v1). The increasing rate of the differential pressure of the portion 123 is smaller. The rate of increase in the medium to high speed operating range (v1 to v) is smaller than that of the comparative structure. Therefore, in the first embodiment, the differential pressure of the valve portion 123 at the same piston speed is higher than that in the comparative structure in the low speed operation range (0 to v1), but in the medium and high speed operation range (v1 to), In the region (v2) higher than the predetermined speed, the differential pressure of the valve portion 123 at the same piston speed is lower than that of the comparative structure. Therefore, in the comparative structure, the differential pressure of the valve unit 123 in the high speed operation region (v3), which is larger than the pressure compensation limit value P, is suppressed to be smaller than the pressure compensation limit value P in the first embodiment. It becomes possible.

  As described above, in the low speed operation range (0 to v1), the inner peripheral side contact portion 130 of the valve portion 123 that is not pressed by the pressing input portion 132 can be easily separated from the intermediate seat portion 77. The valve opening pressure of the valve part 123 can be lowered. Moreover, the differential pressure | voltage of the valve | bulb part 123 can be enlarged by making the spring constant of the valve | bulb part 123 in a low speed operation area (0-v1) high (the gradient of the pressure difference with respect to flow volume is high). As a result, it is possible to suppress the generation of abnormal noise (so-called noise) when the piston speed is low.

  The apparent spring constant of the valve part 123 in the high-speed operating range (v3) can be set low (the gradient of the pressure difference with respect to the flow rate is low), and the flow rate shortage can be suppressed by keeping the differential pressure of the valve part 123 small. it can. Therefore, it is possible to compensate for a large flow rate of the oil liquid from the reservoir chamber 13 to the second chamber 37 during the extension stroke in the high-speed operation region. That is, even when the piston speed increases and a large flow rate needs to be compensated from the reservoir chamber 13 to the second chamber 37, a sufficient valve opening area can be secured and the flow rate compensation can be performed. Therefore, the damping force lag at the initial stage of the contraction stroke caused by insufficient compensation of the flow rate of the oil liquid from the reservoir chamber 13 to the second chamber 37 during the extension stroke in the high-speed operation region, and a decrease in riding comfort and noise due to the lag. Generation of (so-called “goat noise”) can be suppressed.

  Patent Document 1 described above discloses a cylinder device having a valve member in which an inner seat portion and an outer seat portion are formed across a flow path, and a valve that is detachable from the outer seat portion and the inner seat portion. ing. This cylinder device has a structure in which a radial intermediate position of the valve is directly pressed by a spring member. With such a structure, the spring force of the spring member acts on both the inner and outer peripheral sides of the valve. For this reason, when the oil liquid flows into the pressure chamber from the reservoir chamber during the extension stroke, it is possible to compensate for a sufficient flow rate in the high piston region while setting a high gradient of the pressure difference with respect to the flow rate at the low piston speed. It has become difficult.

  On the other hand, in the cylinder device 11 of the first embodiment, the resistance member 145 located on the side in the direction of opening the flow path 72 of the valve portion 123 is opposed to the spring member 114 and the one surface faces the spring member 114. The other surface faces the valve portion 123, and has a pressing member 113 that sits on the outer seat portion 76 when the valve portion 123 is closed. Thus, when the piston speed is low, the valve portion 123 is separated from the intermediate seat portion 77 on the side where the pressing member 113 does not sit out of the outer seat portion 76 and the intermediate seat portion 77, and the piston speed is higher than the low speed. At this time, the outer sheet part 76 and the intermediate sheet part 77 are separated from the outer sheet part 76 on the side where the pressing member 113 is seated.

  Therefore, when the piston speed is low, the inner circumferential side contact portion 130 of the valve portion 123 that is not pressed by the pressing member 113 can be easily separated from the intermediate seat portion 77, and therefore the valve opening pressure of the valve portion 123 is reduced. Can be lowered. Further, when the piston speed is low, the spring constant of the valve portion 123 can be increased, and the differential pressure of the valve portion 123 can be increased. As a result, it is possible to suppress the generation of abnormal noise (so-called noise) when the piston speed is low.

  In addition, by suppressing the differential pressure of the valve portion 123 at a high piston speed, an insufficient flow rate can be suppressed. Therefore, it is possible to compensate for a large flow rate of the oil liquid from the reservoir chamber 13 to the second chamber 37 during the extension stroke in the high-speed operation region. Therefore, it is possible to suppress the lag of the damping force at the initial stage of the contracting stroke, the decrease in riding comfort and the generation of abnormal noise (so-called goto noise) resulting therefrom.

  As described above, the cylinder device 11 according to the first embodiment can optimize the valve characteristics when the piston speed is low. As a result, it is possible to suppress the generation of abnormal noise when the piston speed is low. Further, it is possible to optimize the valve characteristics when the piston speed is high. As a result, it is possible to suppress the lag of the damping force at the initial stage of the contracting stroke after the extending stroke in a state where the piston speed is high, the decrease in riding comfort and the generation of abnormal noise resulting therefrom.

[Second Embodiment]
Next, the second embodiment will be described mainly based on FIGS. 8 to 12 with a focus on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  As shown in FIGS. 8 and 9, the second embodiment has a body valve assembly 70 </ b> A that is partially different from the body valve assembly 70 of the first embodiment. As shown in FIG. 9, the body valve assembly 70A includes a base member 30, a screw member 86, a nut 90, a disc valve 101, a small diameter disc 105, a regulating member 106, and a valve plate 110 that are the same as those in the first embodiment. It is used. The body valve assembly 70A is positioned on the opening direction side of the flow path 72 of the valve plate 110, and a resistance member 145A that serves as a valve opening resistance of the valve plate 110 is a part of the resistance member 145 of the first embodiment. It is different.

  The resistance member 145A includes a washer 111, a small-diameter washer 112, and a spring member 114 that are the same as those in the first embodiment, and a pressing member 113A that is different from the pressing member 113 in the first embodiment.

  In the body valve assembly 70A, the valve plate 110 is stacked on the base member 30 as in the first embodiment. However, unlike the first embodiment, the pressure plate 113A, the small-diameter washer 112, and the washer 111 are provided on the valve plate 110. The spring member 114 and the washer 115 are stacked in this order. The valve plate 110, the pressing member 113A, the small diameter washer 112, the washer 111, the spring member 114, and the washer 115 are clamped to the base member 30 and the nut 90.

  The pressing member 113A is formed by stamping from a single plate member and has a flat plate shape. As shown in FIGS. 10 and 11, the pressing member 113 </ b> A includes an annular fixed part 201, an annular pressure input part 202 having an inner diameter larger than the outer diameter of the fixed part 201, and these fixed parts It consists of the one support part 203 which connects the part 201 and the press input part 202 in the state arrange | positioned concentrically.

  The support part 203 is along the radial direction of the fixed part 201 and the pressing input part 202, and connects the same positions in the circumferential direction. The support portion 203 is recessed in an arc shape on both sides in the circumferential direction of the fixing portion 201 and the pressing input portion 202. As a result, the support portion 203 has a narrow intermediate predetermined position between the fixed portion 201 and the pressure input portion 202, and the width increases from the intermediate predetermined position toward the fixed portion 201. The width becomes wider toward the pressing input unit 202. 113 A of press members are suppressing the bending rigidity of an axial direction low by connecting the fixing | fixed part 201 fixed with respect to the base member 30, and the press input part 202 with the one support part 203. FIG. As a result, the pressing member 113A suppresses the influence on the bending of the pressing input portion 202 due to the fixing portion 201 being fixed.

  As shown in FIG. 9, in the body valve assembly 70 </ b> A, the pressing member 113 </ b> A fits the shaft portion 87 of the screw member 86 to the circular inner peripheral portion of the fixed portion 201 to define the base member 30 of the valve plate 110. It is stacked on the opposite side. The support portion 203 positions the pressing input portion 202 in the radial direction with respect to the fixing portion 201, that is, the shaft portion 87 of the screw member 86. In the pressing member 113 </ b> A, the outer diameter of the fixing portion 201 is equal to the outer diameter of the fixing portion 122 of the valve plate 110.

  The pressing input portion 202 has an inner diameter that is slightly smaller than the inner diameter of the valve portion 123 of the valve plate 110, and an outer diameter that is slightly larger than the inner diameter of the valve portion 123. The pressure input unit 202 overlaps the inner circumferential side contact portion 130 of the valve portion 123 in the radial direction and contacts the inner circumferential side contact portion 130.

  The pressing input portion 202 has an inner diameter that is slightly smaller than the inner diameter of the intermediate sheet portion 77, and an outer diameter that is substantially the same as the outer diameter of the intermediate sheet portion 77 and smaller than the inner diameter of the outer sheet portion 76. It has become.

  Therefore, the pressing member 113A comes into contact with the inner peripheral side contact portion 130 of the valve portion 123 in the press input portion 202 when the valve plate 110 closes against both the outer seat portion 76 and the intermediate seat portion 77. The intermediate seat portion 77 is seated via the inner peripheral side abutting portion 130. It should be noted that the pressing member 113A does not come into contact with the outer peripheral side contact portion 129 of the valve portion 123 when the valve plate 110 is in contact with both the outer seat portion 76 and the intermediate seat portion 77, but the outer seat portion. Never sit on 76. In other words, the pressing member 113 </ b> A can contact only the inner peripheral contact portion 130 of the outer peripheral contact portion 129 and the inner peripheral contact portion 130 of the valve portion 123. The seat portion 77 can be seated only on the intermediate seat portion 77. In other words, the pressing member 113 </ b> A can contact only the inner peripheral side contact portion 130 in the entire range of the valve portion 123.

  The pressing member 113 </ b> A causes the spring load of the spring member 114 to act on the inner peripheral contact portion 130 of the valve portion 123 of the valve plate 110. The valve portion 123 receives the spring load of the spring member 114 via the pressing member 113A and is supported by using the load input point as a fulcrum.

  As shown in FIG. 8, in the spring member 114, a plurality of spring legs 142 are all in contact with the pressing input portion 202 of the pressing member 113A. The spring member 114 presses the pressing member 113A and applies a predetermined set load to the valve portion 123 of the valve plate 110 via the pressing member 113A. The spring member 114 and the pressing member 113A close the flow path 72 when the valve plate 110 is in contact with the outer seat portion 76 and the intermediate seat portion 77 at the outer peripheral contact portion 129 and the inner peripheral contact portion 130. Energize to hold the unit.

  The pressing member 113A has one surface facing the spring member 114 and the other surface facing the valve plate 110, and when the valve plate 110 is closed, one of the outer seat portion 76 and the intermediate seat portion 77. Is seated on the intermediate seat portion 77. The resistance member 145A applies a predetermined set load by the spring member 114 to the inner peripheral side contact portion 130 of the valve plate 110 via the pressing member 113A.

  The resistance member 145A, the valve plate 110, the outer sheet portion 76, the intermediate sheet portion 77, and the flow path 72 of the base member 30 are oil from the reservoir chamber 13 side to the second chamber 37 side through the flow path 72. A valve mechanism 148 </ b> A is configured as a suction valve that allows the fluid to flow and restricts the fluid flow from the second chamber 37 side to the reservoir chamber 13 side through the flow path 72.

  Here, in the valve plate 110, the outer peripheral side contact portion 129 of the valve portion 123 is in contact with the outer seat portion 76, and the inner peripheral side contact portion 130 of the valve portion 123 is in contact with the intermediate seat portion 77, so that the flow path 72. When the valve is closed, the inner peripheral contact portion 130 of the valve portion 123 is pressed against the intermediate seat portion 77 via the pressing member 113A by the urging force of the spring member 114. On the other hand, since the outer peripheral side contact portion 129 of the valve portion 123 does not contact the pressing member 113A at this time, the force pressed against the outer seat portion 76 by the urging force of the spring member 114 becomes substantially zero. Therefore, in the second embodiment, in the valve portion 123 of the valve plate 110, the outer peripheral contact portion 129 that contacts the outer seat portion 76 is more than the inner peripheral contact portion 130 that contacts the intermediate seat portion 77. Easy to open.

  Next, the operation of the second embodiment will be described with reference to FIG.

  First, when the pressure in the second chamber 37 is equal to the pressure in the reservoir chamber 13, the valve plate 123 has the valve portion 123 simultaneously with the outer seat portion 76 and the intermediate seat portion 77 as shown in FIG. The outer flow path 72 is closed by contacting.

  In the extension stroke in which the rod 38 moves to the extension side and the piston 35 moves to the first chamber 36 side, the pressure in the second chamber 37 falls below the pressure in the reservoir chamber 13. At this time, if the piston speed, which is the moving speed of the rod 38 and the piston 35, is low, the flow rate of the oil flowing from the reservoir chamber 13 to the second chamber 37 is small. At this time, the valve portion 123 is pressed against the intermediate seat portion 77 by the pressing input portion 202 of the pressing member 113A in which the inner peripheral contact portion 130 is pressed by the urging force of the spring member 114, and the pressure receiving area × pressure difference If set load, as shown in FIG. 12 (b), the outer peripheral side abutting portion 129 side not pressed by the pressing input portion 202 bends and opens away from the outer sheet portion 76, and these gaps and Then, the oil liquid is caused to flow from the reservoir chamber 13 to the second chamber 37 via the flow path 72.

  In other words, when the piston speed is low, the outer peripheral side contact portion 129 of the valve portion 123 is separated from the outer seat portion 76 of the outer seat portion 76 and the intermediate seat portion 77 where the pressing member 113A is not seated. At this time, in the valve portion 123, the outer peripheral side contact portion 129 is on the opposite side in the radial direction from the inner peripheral side contact portion 130 where the biasing force of the spring member 114 acts most strongly, and the biasing force of the spring member 114 is , It will be easily separated from the outer seat portion 76, and the valve opening pressure of the valve mechanism 148A will be low.

  Further, when the valve portion 123 is bent using the inner peripheral side abutting portion 130 sandwiched between the pressing input portion 202 and the intermediate seat portion 77 as described above when being separated from the outer seat portion 76, the outer seat portion 76. Only the side opens. At this time, the pressure receiving area of the valve portion 123 is an annular area between the outer seat portion 76 and the intermediate seat portion 77, and the distance between the outer seat portion 76 and the intermediate seat portion 77 is short. The spring constant increases. When the spring constant increases, the gradient of the pressure difference with respect to the flow rate can be increased as in the first embodiment.

  When the piston speed is higher than the low speed, the flow rate of the oil liquid flowing from the reservoir chamber 13 to the second chamber 37 increases. Along with this, the pressure difference acting on the pressure receiving portion of the valve portion 123 increases, and when the pressure receiving area × pressure difference> set load is satisfied, as shown in FIG. In addition to the separation of the contact portion 129 from the outer seat portion 76, the inner peripheral contact portion 130 of the valve portion 123 pushes up the pressure input portion 202 of the pressure member 113A against the biasing force of the spring member 114, The spring leg 114 is separated from the intermediate sheet portion 77 while deforming the spring leg portion 142 of the spring member 114. That is, when the piston speed is higher than the low speed, the valve portion 123 is separated from the intermediate seat portion 77 on the side of the outer seat portion 76 and the intermediate seat portion 77 on which the pressing member 113A is seated. Accordingly, the sensitivity of the valve opening area with respect to the pressure difference increases, the gradient of the pressure difference of the valve portion 123 with respect to the flow rate decreases, and the oil liquid flows from the reservoir chamber 13 to the second chamber 37 with a relatively small pressure difference. be able to.

  According to the second embodiment described above, as in the first embodiment, when the piston speed is low, the valve opening pressure of the valve portion 123 can be lowered, and the differential pressure of the valve portion 123 is increased. it can. As a result, it is possible to suppress the generation of abnormal noise (so-called noise) when the piston speed is low. Further, when the piston speed is high, the flow rate shortage can be suppressed by keeping the differential pressure of the valve portion 123 small, so that the damping force lag at the initial stage of the contraction stroke after the extension stroke at the high piston speed can be reduced. In addition, it is possible to suppress a decrease in riding comfort and the generation of abnormal noise (so-called goto noise) due to this.

  In the first and second embodiments, in the cylinder device 11, the valve member 110 that opens and closes the flow path 72, and the resistance member that is located on the side of the opening direction of the flow path 72 of the valve plate 110 are formed on the base member 30 as the valve member. The case where 145 and 145A are provided has been described as an example, but these structures can also be applied to the piston 35 side. In this case, for example, the valve plate 110 of the first and second embodiments is used instead of the disk valve 46 which is mounted on the outer seat portion 51 and the intermediate seat portion 52 of the piston 35 as a valve member and opens and closes the flow path 44. And the resistance member 145 of the first embodiment or the resistance member 145A of the second embodiment may be provided instead of the resistance member 55 positioned on the opening direction side of the flow path 44 of the disk valve 46.

  The first aspect of the embodiment described above includes a cylinder in which a fluid is sealed, a valve member fitted in the cylinder and partitioning the cylinder into at least two chambers, and one end extending to the outside of the cylinder. A rod to be taken out, a flow path provided in the valve member and through which a fluid flows when the rod moves, a first seat portion provided inside the flow path of the valve member, and the valve member A second seat part provided outside the flow path, a valve placed on the first sheet part and the second sheet part to open and close the flow path, and a side of the valve in the direction of opening the flow path A resistance member positioned on the cylinder, wherein the resistance member includes a spring member, a surface on one side faces the spring member, a surface on the other side faces the valve, and the valve When the first valve is closed. And a pressing member seated on either the second seat portion or the second seat portion, and the valve has the pressing member out of the first seat portion and the second seat portion when the piston speed is low. When the piston speed is higher than the low speed, the first seat part and the second seat part are separated from the other side on which the pressing member is seated. To do. This makes it possible to optimize the valve characteristics.

  According to a second aspect, in the first aspect, the pressing member is seated on the second seat portion, and the valve is separated from the first seat portion when the piston speed is low, and the piston speed is When the speed is higher than the low speed, the second sheet portion is separated.

  According to a third aspect, in the first aspect, the pressing member is seated on the first seat portion, and the valve is separated from the second seat portion when the piston speed is low, and the piston speed is When the speed is higher than the low speed, the first sheet portion is separated.

11 Cylinder device 15 Cylinder 30 Base member (valve member)
36 1st chamber 37 2nd chamber 38 Rod 72 Flow path 76 Outer sheet part (2nd sheet part)
77 Intermediate sheet part (first sheet part)
113, 113A Press member 114 Spring member 123 Valve portion (valve)
145, 145A resistance member

Claims (3)

A cylinder in which a fluid is enclosed;
A valve member fitted in the cylinder and partitioning the cylinder into at least two chambers;
A rod having one end extending to the outside of the cylinder;
A flow path provided in the valve member and through which a fluid flows when the rod moves;
A first seat portion provided inside the flow path of the valve member;
A second seat portion provided outside the flow path of the valve member;
A valve mounted on the first seat portion and the second seat portion to open and close the flow path;
A resistance member positioned on the direction side of opening the flow path of the valve;
A cylinder device comprising:
The resistance member is
A spring member;
A pressing member that has one surface facing the spring member and the other surface facing the valve and seated on one of the first seat portion and the second seat portion when the valve is closed; ,
Have
The valve is
When the piston speed is low, the first seat portion and the second seat portion are separated from one side on which the pressing member is not seated,
When the piston speed is higher than the low speed, the cylinder device is separated from the other of the first seat portion and the second seat portion on the side on which the pressing member is seated. The pressing member is seated on the second seat portion,
The valve is
When the piston speed is low, it is separated from the first seat part,
2. The cylinder device according to claim 1, wherein when the piston speed is higher than the low speed, the cylinder device is separated from the second seat portion. The pressing member is seated on the first seat portion,
The valve is
When the piston speed is low, it is separated from the second seat part,
2. The cylinder device according to claim 1, wherein when the piston speed is higher than the low speed, the cylinder device is separated from the first seat portion.

Images