JP5948186B2 - Shock absorber - Google Patents

Description

  The present invention relates to a shock absorber.

  Some disc valves provided in a shock absorber have an inner annular portion, an outer annular portion, and a support portion that connects them (see, for example, Patent Document 1).

JP 2004-60792 A

  In the above disk valve, the inner annular portion is clamped in the axial direction, and the support portion and the outer annular portion are deformed to open the flow path, so that the valve opening amount is limited. Further, in order to increase the valve opening amount, there are some which can move the disk valve in the axial direction without clamping, but there is a problem that the assembly work becomes complicated because it is movable.

  Accordingly, an object of the present invention is to provide a shock absorber capable of facilitating assembly work while ensuring a valve opening amount.

  In order to achieve the above object, according to the present invention, a disc valve includes an outer annular portion, an inner annular portion, and one or more support portions that connect the outer annular portion and the inner annular portion. The inner annular portion receives a clamping axial force while the outer annular portion is in contact with at least the inner sheet portion, or the outer annular portion is in contact with at least the inner sheet portion and is clamped. In this state, the support portion is broken by the outer annular portion being displaced by the working fluid flowing through the communication hole.

  According to the present invention, it is possible to facilitate the assembling work while securing the valve opening amount.

It is a fragmentary sectional view showing a buffer of one embodiment concerning the present invention. It is a partial expanded sectional view which shows the principal part of the buffer of one Embodiment which concerns on this invention. It is a top view which shows the disk valve of the buffer of one Embodiment which concerns on this invention. It is the elements on larger scale which show the easy fracture part of the disc valve of the buffer of one embodiment concerning the present invention.

  A shock absorber according to an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the shock absorber of this embodiment has a cylinder 11 in which a fluid such as liquid or gas is enclosed. The cylinder 11 includes an inner cylinder 12 and an outer cylinder 13 having a larger diameter than the inner cylinder 12 and concentrically provided so as to cover the inner cylinder 12, and between the inner cylinder 12 and the outer cylinder 13. It has a double cylinder structure in which the reservoir chamber 14 is formed.

  A piston 17 is slidably fitted in the inner cylinder 12 of the cylinder 11. The piston 17 defines an upper chamber 18 and a lower chamber 19 in the inner cylinder 12, that is, in the cylinder 11. Specifically, in the cylinder 11, hydraulic fluid as a fluid is sealed in the upper chamber 18 and the lower chamber 19, and hydraulic fluid and gas as a fluid are sealed in the reservoir chamber 14.

  In the cylinder 11, the other end of a rod 22 whose one end extends to the outside of the cylinder 11 is inserted into the inner cylinder 12, and the piston 17 has a nut 23 at the other end in the inner cylinder 12 of the rod 22. It is concluded by Although not shown, one end side of the rod 22 is inserted through a rod guide and an oil seal attached to the upper ends of the inner cylinder 12 and the outer cylinder 13 and extends to the outside.

  The rod 22 has a main shaft portion 25 and an attachment shaft portion 26 at the inner end portion of the cylinder 11 and having a smaller diameter than the main shaft portion 25, so that the main shaft portion 25 has an end on the attachment shaft portion 26 side. A step surface 27 is formed along the direction orthogonal to the axis. The attachment shaft portion 26 is formed with a male screw 28 for screwing the nut 23 into a predetermined range on the opposite side to the main shaft portion 25.

  The piston 17 is fitted in the inner cylinder 12 of the cylinder 11 to partition the inner cylinder 12 into two chambers, an upper chamber 18 and a lower chamber 19, and an outer periphery of the piston valve body 31. A sliding contact member 32 is mounted on the surface and slidably contacts the inner cylinder 12. The piston valve body 31 is formed with a cylindrical portion 34 projecting in the axial direction on the outer peripheral side on the lower chamber 19 side.

  The piston valve body 31 is formed in an annular shape with a through hole 35 through which the attachment shaft portion 26 of the rod 22 is inserted in the center in the radial direction. The piston valve body 31 includes an annular boss 36 that protrudes in the axial direction so as to surround the through-hole 35 on the outer side in the radial direction, and a radial boss on the opposite side of the cylindrical portion 34 in the axial direction. An annular inner sheet portion 37 that protrudes in the axial direction outside the portion 36 and an annular outer sheet portion 38 that protrudes in the axial direction outside the radially inner sheet portion 37 are formed. Furthermore, the piston valve body 31 has an annular boss portion 40 projecting in the axial direction outside the radial through-hole 35 on the side of the cylindrical portion 34 in the axial direction, and a boss portion 40 in the radial direction. An annular sheet portion 41 protruding in the axial direction on the outer side and the inner side of the cylindrical portion 34 is formed.

  Here, in the axial direction of the piston valve body 31, the boss portion 36, the inner seat portion 37 and the outer seat portion 38 have the same height position, and the seat portion 41 protrudes from the boss portion 40. The direction height is slightly higher.

  One end of the piston valve body 31 in the axial direction is opened between the boss portion 36 and the inner seat portion 37, and the other end is opened between the boss portion 40 and the seat portion 41 so as to penetrate in the axial direction. A plurality of holes 43 are formed at intervals in the circumferential direction (only one place is shown in FIG. 1 because of the cross section). The piston valve body 31 has one axial end opened between the inner seat portion 37 and the outer seat portion 38 and the other end opened between the seat portion 41 and the cylindrical portion 34 in the axial direction. A plurality of communication holes 44 penetrating therethrough are formed at intervals in the circumferential direction (only one location is shown in FIG. 1 because of the cross section).

  The inner communication hole 43 communicates between the upper chamber 18 and the lower chamber 19, and forms one flow path 45 through which hydraulic fluid flows between the upper chamber 18 and the lower chamber 19. Yes. The outer communication hole 44 communicates between the two chambers of the upper chamber 18 and the lower chamber 19, and forms the other channel 46 through which the working fluid flows between the upper chamber 18 and the lower chamber 19. Yes. Therefore, these flow paths 45 and 46 are provided in the piston valve body 31. The piston valve body 31 is formed with an inner seat portion 37 on the center side (inner periphery side) and an outer seat portion 38 on the outer periphery side with the communication hole 44 in between.

  The piston 17 has a disc valve 50, a spacer 51, and a regulating member 52 in order from the piston valve body 31 side on the cylindrical portion 34 side in the axial direction of the piston valve body 31. The piston 17 has a disc valve 55, a spacer 56, a spring member 57, and a regulating member 58 in order from the piston valve body 31 side on the side opposite to the cylindrical portion 34 in the axial direction of the piston valve body 31. Yes.

  A rod insertion hole 60 is formed at the center of the disk valve 50 in the radial direction, a rod insertion hole 61 is formed at the center of the spacer 51 in the radial direction, and a rod insertion hole 62 is formed at the center of the restriction member 52 in the radial direction. It is formed to penetrate through. In addition, a rod insertion hole 63 is provided at the center of the disk valve 55 in the radial direction, a rod insertion hole 64 is provided at the center of the spacer 56 in the radial direction, and a rod insertion hole 65 is provided at the center of the spring member 57 in the radial direction. In the center of the member 58 in the radial direction, rod insertion holes 66 are formed penetrating in the axial direction.

  The rod 22 has a mounting shaft portion 26 that passes through the rod insertion hole 66 of the regulating member 58, the rod insertion hole 65 of the spring member 57, the rod insertion hole 64 of the spacer 56, the rod insertion hole 63 of the disc valve 55, and the piston valve body 31. The nut 23 is screwed into the male screw 28 through the hole 35, the rod insertion hole 60 of the disc valve 50, the rod insertion hole 61 of the spacer 51, and the rod insertion hole 62 of the regulating member 52. Thereby, the inner peripheral side of the regulating member 58, the inner peripheral side of the spring member 57, the spacer 56, the inner peripheral side of the disc valve 55, the inner peripheral side of the piston valve body 31, the inner peripheral side of the disc valve 50, the spacer 51 and The inner peripheral side of the regulating member 52 is clamped in the axial direction by the step surface 27 of the main shaft portion 25 of the rod 22 and the nut 23.

  The disc valve 50, the spacer 51, the regulating member 52, the disc valve 55, the spacer 56, the spring member 57 and the regulating member 58 are moved in the radial direction with respect to the rod 22 and the piston valve body 31 by the mounting shaft portion 26 of the rod 22. It is regulated.

  The disc valve 50 on the lower chamber 19 side has an outer diameter slightly larger than that of the seat portion 41, and abuts against the boss portion 40 and the seat portion 41 of the piston valve body 31 to close the inner flow path 45. . When the rod 22 moves to the extending side to increase the amount of protrusion that protrudes from the cylinder 11, the pressure of the upper chamber 18 is higher than that of the lower chamber 19 by the piston 17 that moves together with the rod 22. Accordingly, the flow path 45 is opened by separating from the seat portion 41. Thereby, in the inner flow path 45 provided in the piston valve body 31, when the rod 22 moves to the extension side, the fluid flows from the upper chamber 18 to the lower chamber 19, and the disc valve 50 This is a disk valve on the extension side that opens and closes the flow path 45. The fluid flows through the flow path 45 when the rod 22 and the piston 17 are moved to the extension side.

  The outer diameter of the spacer 51 is smaller than the outer diameter of the disc valve 50 and is substantially the same as the outer diameter of the boss portion 40. The regulating member 52 has an outer diameter larger than the outer diameter of the spacer 51 and slightly smaller than the outer diameter of the disc valve 50. When the disc valve 50 is deformed by a predetermined amount in a direction away from the seat portion 41, the regulating member 52 abuts on the disc valve 50 and regulates further deformation.

  The outer diameter of the disk valve 55 on the upper chamber 18 side is slightly larger than that of the outer seat portion 38 of the piston valve body 31. The disc valve 55 has a notch 68 formed radially inward from the contact position with the inner seat portion 37, and the inner flow path 45 is always in communication with the upper chamber 18 through the notch 68. Yes.

  The disc valve 55 contacts the boss portion 36, the inner seat portion 37, and the outer seat portion 38 of the piston valve body 31 to close the outer flow path 46. When the rod 22 moves to the contraction side that increases the amount of entry into the cylinder 11, the pressure of the lower chamber 19 is increased by the piston 17 that moves together with the rod 22, so that the pressure is lower than the upper chamber 18. The outer flow path 46 is opened away from the seat portion 38. Thereby, in the outer flow path 46 provided in the piston valve body 31, when the rod 22 moves to the contraction side, the fluid flows from the lower chamber 19 to the upper chamber 18, and the disc valve 55 This is a contraction-side disk valve that opens and closes the flow path 46. When the rod 22 and the piston 17 are thus moved to the contraction side, the fluid flows through the flow path 46.

  The spring member 57 includes a flat disk-like base 67 having a rod insertion hole 65 formed in the center, and a plurality of elastic points extending obliquely outward from the outer periphery of the base 67 in the radial direction and on one side in the axial direction. A plate-like spring composed of the legs 70 is formed. The spring member 57 is clamped to the spacer 56 and the restricting member 58 at the base 67, and abuts against the disc valve 55 at the tip ends of a plurality of elastic legs 70 extending radially outward from the spacer 56. To the piston valve body 31.

  The regulating member 58 has an outer diameter substantially the same as the outer diameter of the disk valve 55. The restricting member 58 is formed with a plurality of communication holes 69 that are in communication with the upper chamber 18 through the notch 68 and are provided with a plurality of holes in the axial direction at intervals in the circumferential direction. Yes. When the disc valve 55 is deformed by a predetermined amount in a direction away from the outer seat portion 38, the regulating member 58 abuts on the disc valve 55 and regulates further deformation.

  The outer cylinder 13 includes a cylindrical cylindrical member 72 and a bottom lid member 73 that is fitted to the lower end of the cylindrical member 72 and closes the opening at the lower end. The bottom cover member 73 is fitted to the inner peripheral portion of the cylindrical member 72 at the outer peripheral portion, and in this state, has a stepped shape so as to be positioned on the outer side in the axial direction toward the center side. The bottom cover member 73 is fixed to the cylindrical member 72 in a sealed state by welding.

  A lower chamber 19 and the above-described reservoir chamber 14 are defined in the cylinder 11 at the lower end portion of the inner cylinder 12, and a damping valve that generates a contraction-side damping force, and an extension side from the reservoir chamber 14 to the lower chamber 19. A base valve 71 having a suction valve for flowing hydraulic fluid without substantially generating a damping force is provided therein.

  The base valve 71 has an annular base valve body (valve body) 76 that is fitted into the inner cylinder 12 of the cylinder 11 and partitions the inside of the cylinder 11 into two chambers, a lower chamber 19 and a reservoir chamber 14. The base valve body 76 is made of sintered metal, and a stepped portion 77 having a smaller diameter than the lower portion is formed on the outer peripheral portion of the upper portion. The stepped portion 77 is fitted to the inner peripheral portion of the lower end of the inner cylinder 12. To do. The base valve body 76 has an annular projecting foot 78 projecting in the axial direction on the outer peripheral side of the lower portion, and abuts against the bottom lid member 73 at the projecting foot 78. A plurality of flow passage grooves 79 penetrating in the radial direction are formed in the protruding foot 78 at intervals in the circumferential direction. A range from the inner cylinder 12 and the outer cylinder 13 to the area between the base valve 71 and the bottom cover member 73 is communicated with the flow path groove 79 to form the reservoir chamber 14.

  As shown in FIG. 2, the base valve body 76 is formed in such a manner that a through hole 81 penetrates in the center in the radial direction in the axial direction, thereby forming an annular shape. Further, the base valve body 76 has a boss 84 projecting in an annular shape in the axial direction so as to surround the through-hole 81 on the outer side in the radial direction, and a boss in the radial direction on the opposite side to the projecting foot 78 in the axial direction. An annular inner sheet portion 85 that protrudes in the axial direction outside the portion 84 and an annular outer sheet portion 86 that protrudes in the axial direction outside the radially inner sheet portion 85 are formed. The inner sheet portion 85 and the outer sheet portion 86 have the same axial height, and the boss portion 84 has a lower axial height (projection direction height) than the inner sheet portion 85 and the outer sheet portion 86. Yes. That is, the boss portion 84 is shifted in the axial direction in the inner direction of the base valve body 76 with respect to the inner seat portion 85 and the outer seat portion 86.

  Further, the base valve body 76 includes an annular boss 88 projecting in the axial direction so as to surround the through hole 81 on the radially outer side, and a radial boss 88 on the projecting foot 78 side in the axial direction. Further, an annular seat portion 89 that protrudes in the axial direction on the outer side and on the inner side of the protruding foot portion 78 is formed. In the axial direction of the base valve body 76, the seat portion 89 is slightly higher in the protruding direction than the boss portion 88.

  One end of the base valve body 76 in the axial direction opens between the boss portion 84 and the inner seat portion 85, and the other end opens between the boss portion 88 and the seat portion 89, and is a communication hole that penetrates in the axial direction. 92 are formed at a plurality of locations at intervals in the circumferential direction. Further, one end of the base valve body 76 in the axial direction opens between the inner seat portion 85 and the outer seat portion 86, and the other end opens between the seat portion 89 and the protruding foot portion 78. A plurality of communication holes 93 penetrating through are formed at intervals in the circumferential direction.

  The inner communication hole 92 communicates between the lower chamber 19 and the reservoir chamber 14, and forms one flow path 94 through which the working fluid flows between the lower chamber 19 and the reservoir chamber 14. Yes. The outer communication hole 93 also communicates between the two chambers of the lower chamber 19 and the reservoir chamber 14, and forms the other flow path 95 through which the working fluid flows between the lower chamber 19 and the reservoir chamber 14. Yes. In other words, the base valve body 76 is formed with an inner seat 85 on the center side (inner circumference) and an outer seat 86 on the outer circumference with the communication hole 93 in between.

  The base valve 71 has a pin member 98, and the pin member 98 is provided with a columnar shaft portion 99 inserted into the through hole 81 of the base valve body 76, and a shaft portion 99 provided at one end of the shaft portion 99. Also has a large-diameter disk-shaped head 100. In addition, a diameter-expanded portion 101 that is larger in diameter than the shaft portion 99 is formed by caulking at the other end of the shaft portion 99 opposite to the head portion 100.

  The base valve 71 has a disc valve 103 that acts as a damping valve, a spacer 104, and a regulating member 105 in this order from the base valve body 76 side on the protruding foot 78 side in the axial direction of the base valve body 76. Further, the base valve 71 is arranged on the inner peripheral side of the base valve body 76 opposite to the projecting foot 78 in the axial direction, in order from the base valve body 76 side, the inner annular portion 107 of the disc valve 106, the guide 108, the spring. A member 109 and a regulating member 110 are provided. The base valve 71 has an outer annular portion 111 of the disc valve 106 that acts as a suction valve on the outer peripheral side between the base valve body 76 and the spring member 109.

  The disk valve 103 on the reservoir chamber 14 side has a pin insertion hole 112 formed in the center in the radial direction so as to penetrate in the axial direction, and has an annular shape. The disk valve 103 is configured by stacking a plurality of perforated disk-shaped single disk disks having the same outer diameter in the axial direction, and the outer diameter is slightly larger than the outer diameter of the seat portion 89. It has become.

  The spacer 104 has a pin insertion hole 113 formed in the center in the radial direction so as to penetrate in the axial direction, and has an annular shape. The outer diameter of the spacer 104 is smaller than the outer diameter of the disc valve 103 and slightly larger than the outer diameter of the boss portion 88.

  The restriction member 105 has a pin insertion hole 114 formed in the center in the radial direction so as to penetrate in the axial direction, and has an annular shape. The regulating member 105 has an outer diameter that is slightly smaller than the outer diameter of the disc valve 103 and substantially the same diameter as the seat portion 89.

  The guide 108 is formed with a pin insertion hole 117 penetrating in the axial direction at the center in the radial direction, and has an annular shape. The outer diameter of the guide 108 is slightly larger than the outer diameter of the boss portion 84.

  The spring member 109 includes a flat disk-shaped base 119 having a pin insertion hole 118 formed in the center thereof in the axial direction, and extends obliquely outward from the outer periphery of the base 119 and axially to one side. It is a plate-like spring composed of a plurality of protruding elastic legs 120. In the spring member 109, the outer diameter of the base 119 is slightly larger than the outer diameter of the guide 108.

  The restricting member 110 has an annular shape in which a pin insertion hole 121 is formed in the center in the radial direction so as to penetrate in the axial direction. The regulating member 110 has a larger diameter than the outer diameter of the guide 108 and a smaller diameter than the outer diameter of the spring member 109.

  In the present embodiment, as shown in FIG. 3, the disk valve 106 described above is formed by stamping from a single plate member, and has a flat plate shape with a constant thickness. . The disk valve 106 includes the inner annular portion 107, the outer annular portion 111, and a single support portion 125 that connects the inner annular portion 107 and the outer annular portion 111.

  The inner annular portion 107 includes a main plate portion 127 having a circular pin insertion hole 126 formed in the center thereof in the radial direction and penetrating in the axial direction and having an annular shape with a constant width in the radial direction, and an outer peripheral edge of the main plate portion 127. And two projecting portions 128 projecting radially outward from the portion. The projecting portions 128 have radially outer arc-shaped outer peripheral edge portions arranged on the same circle, and the center of this circle coincides with the center of the pin insertion hole 126. The support portion 125 described above is formed between the two protruding portions 128 in the circumferential direction of the inner annular portion 107 so as to protrude radially outward from the inner annular portion 107. A total of three places between the two protrusions 128 and between each of the two protrusions 128 and the support part 125 are concave portions 129 that are recessed inward in the radial direction.

  The three concave portions 129 are arranged at equal positions in the circumferential direction of the inner annular portion 107. The outer diameter of the main plate portion 127 is substantially the same as the outer diameter of the boss portion 84, and the outer diameters of the two protruding portions 128 are larger than the outer diameter of the boss portion 84.

  The support part 125 protrudes outward in the radial direction from the protrusion part 128. In order from the radially inner annular part 107 side, the constant width part 131 having a constant width in the circumferential direction and the circumferential width toward the radially outer side. Has a narrowed width portion 132 and a widened portion 133 whose width in the circumferential direction increases toward the outer side in the radial direction. As shown in FIG. 4, the boundary portion between the reduced width portion 132 and the wide width portion 133 has the narrowest width in the support portion 125, and as described later, the stress when subjected to a load is maximized and easily breaks. It is an easily breakable portion 134.

  The outer annular portion 111 has a main plate portion 136 having an annular shape with a constant width in the radial direction, and three convex portions 137 protruding inward in the radial direction from the inner peripheral edge portion of the main plate portion 136. The three convex portions 137 are arranged at equal positions in the circumferential direction of the outer annular portion 111, and are formed by matching the three concave portions 129 of the inner annular portion 107 with the circumferential position. The three convex portions 137 have an inner peripheral edge portion on the protruding tip side that is concave in an arc shape, and these inner peripheral edge portions are arranged on the same circle, and the centers of the circles are the outer peripheral edge portion and the inner peripheral portion of the main plate portion 136. It coincides with the center of the peripheral edge and also coincides with the center of the pin insertion hole 126. The widened portion 133 of the support portion 125 described above is formed between the two convex portions 137 in the circumferential direction of the outer annular portion 111.

  The outer diameter of the outer annular portion 111 is slightly larger than the outer diameter of the outer seat portion 86, and the inner diameter of the outer annular portion 111 is slightly smaller than the inner diameter of the inner seat portion 85. The diameter of the circle at the inner peripheral edge of the three convex portions 137 is larger than the diameter of the two protruding portions 128 of the inner annular portion 107, and the reduced width portion 132 of the equal width portion 131 from the center of the inner annular portion 107. It is smaller than the diameter of the side end. Further, the diameter of the circle at the inner peripheral edge of the three convex portions 137 is slightly larger than the diameter of the guide 108.

  The shaft portion 99 before caulking of the pin member 98 includes the pin insertion hole 114 of the restriction member 105, the pin insertion hole 113 of the spacer 104, the pin insertion hole 112 of the disk valve 103, the through hole 81 of the base valve body 76, The disc valve 106 is inserted into the pin insertion hole 126, the guide 108 pin insertion hole 117, the spring member 109 pin insertion hole 118, and the regulation member 110 pin insertion hole 121 in this order.

  Here, since the boss portion 84 of the base valve body 76 has a lower axial height than the inner seat portion 85 and the outer seat portion 86, the disc valve 106 is The outer annular portion 111 is in contact with the inner sheet portion 85 and the outer sheet portion 86, and the inner annular portion 107 connected to the outer annular portion 111 via the support portion 125 has a gap between the boss portion 84 and Become. In this state, the guide 108, the spring member 109, and the regulating member 110 are stacked on the inner annular portion 107.

  In this state, the end on the opposite side of the head portion 100 of the shaft portion 99 protruding from the regulating member 110 is crimped to the head portion 100 side. Then, the inner annular portion 107 of the disc valve 106 moves in the axial direction together with the guide 108, the spring member 109, and the restricting member 110 so as to contact the boss portion 84. When the inner annular portion 107 of the disc valve 106 contacts the boss portion 84, the regulating member 105, the spacer 104, the disc valve 103, the base valve body 76, the inner annular portion 107 of the disc valve 106, the guide 108, and the spring member 109. And the regulating member 110 is in a state where there is no axial gap, and in this state, the head portion 100 and the enlarged diameter portion 101 sandwich them. In this way, the inner peripheral side of the regulating member 105, the spacer 104, the inner peripheral side of the disc valve 103, the inner peripheral side of the base valve body 76, the inner annular portion 107 of the disc valve 106, the guide 108, and the base of the spring member 109 119, the inner peripheral side of the regulating member 110 is clamped in the axial direction by the head portion 100 and the enlarged diameter portion 101 of the pin member 98.

  At the time of clamping on the center side of the base valve 71, the disc valve 106 has a boss portion 84 located on the center side of the base valve body 76 with respect to the inner seat portion 85 and an inner annular portion 107 clamped on the guide 108, and at least the inner seat. The outer annular portion 111 that contacts the portion 85 is displaced in the axial direction. As a result, stress concentration occurs in the narrowest easily breakable portion 134 of the support portion 125 that connects the inner annular portion 107 and the outer annular portion 111, and the easily breakable portion 134 is broken. As a result, the inner annular portion 107 and the outer annular portion 111 are separated. At that time, the equal width portion 131 and the reduced width portion 132 of the support portion 125 are separated from the outer annular portion 111 while being integral with the inner annular portion 107, and the widened portion 133 of the support portion 125 is integral with the outer annular portion 111. Separated from the inner annular portion 107. The easily breakable portion 134 has a width or the like so that it is always broken when the inner annular portion 107 receives a predetermined clamping axial force for clamping with the outer annular portion 111 in contact with at least the inner sheet portion 85. Is set.

  When the center side of the base valve 71 is clamped as described above, the disc valve 103, the spacer 104, the regulating member 105, the inner annular portion 107, the guide 108, the spring member 109, and the regulating member 110 are connected to the shaft portion 99 of the pin member 98. Accordingly, the radial movement of the pin member 98 and the base valve body 76 is also restricted. Further, the outer annular portion 111 separated from the inner annular portion 107 has three convex portions 137 that abut the outer peripheral surface of the guide 108, so that the guide 108, the pin member 98, and the base valve body 76 are in the radial direction. It is possible to move in the axial direction while the movement of is restricted.

  The disk valve 103 on the reservoir chamber 14 side is in contact with the seat portion 89 on the outer peripheral side to close the inner flow path 94. The disc valve 103 is separated from the seat portion 89 shown in FIG. 2 when the rod 22 shown in FIG. 1 moves to the contraction side and the piston 17 moves to the lower chamber 19 side and the pressure in the lower chamber 19 rises. Then, the inner flow path 94 is opened. As a result, the inner flow path 94 provided in the base valve body 76 causes the fluid to flow from the lower chamber 19 toward the reservoir chamber 14 when the rod 22 moves to the contraction side. The flow path 94 is opened and closed to form a compression side disk valve that generates a damping force. Thus, the fluid flows through the flow path 94 when the rod 22 and the piston 17 move to the contraction side. The disc valve 103 has a lower chamber so as to discharge the excess liquid mainly generated by the rod 22 entering the cylinder 11 because of the relationship with the disc valve 55 on the contraction side provided in the piston 17 shown in FIG. The function of flowing the liquid from 19 to the reservoir chamber 14 is achieved. The disk valve on the contraction side may be a relief valve that relieves pressure when the cylinder internal pressure increases. When the disc valve 103 is deformed by a predetermined amount in a direction away from the seat portion 89, the regulating member 105 abuts on the outer peripheral side of the disc valve 103 and regulates further deformation.

  In the disc valve 106, the outer annular portion 111 is simultaneously brought into contact with the outer seat portion 86 and the inner seat portion 85 by the urging force of the spring member 109 to close the outer flow path 95, and between the inner seat portion 85 and the outer seat portion 86. A valve chamber 140 is formed between them. In addition, the outer annular portion 111 moves as a whole in the axial direction while the disc valve 106 is guided by the convex portion 137 on the outer peripheral surface of the guide 108, and is brought into contact with the outer seat portion 86 and the inner seat portion 85. That is, the outer annular portion 111 after the disc valve 106 is separated is disposed so as to be detachable from the inner seat portion 85 and the outer seat portion 86. When the rod 22 shown in FIG. 1 moves to the extension side, the piston 17 moves to the upper chamber 18 side, and the pressure in the lower chamber 19 drops, the disc valve 106 has the outer annular portion 111 shown in FIG. The channel 95 is opened away from the portion 86 and the inner sheet portion 85. As a result, the outer flow path 95 provided in the base valve body 76 allows fluid to flow from the reservoir chamber 14 toward the lower chamber 19 when the rod 22 moves to the extension side. This is a disk valve on the extension side that opens and closes the flow path 95.

  Here, the spring member 109 is in contact with the outer annular portion 111 of the disk valve 106 at the tips of the elastic legs 120 that extend radially outward from the guide 108 and presses it in the axial direction to thereby form a base. The outer seat portion 86 and the inner seat portion 85 of the valve body 76 are brought into contact with each other. Here, the elastic leg 120 of the spring member 109 has a spring constant set to a minimum, and even if the elastic leg 120 is deformed, the minimum attachment necessary for bringing the disc valve 106 into contact with the inner seat portion 85 and the outer seat portion 86 is provided. Only power is generated. For this reason, the outer annular portion 111 of the disk valve 106 can reliably close the flow path 95 with the urging force of the elastic leg 120 if the pressure in the lower chamber 19 is equal to or higher than the pressure in the reservoir chamber 14. When the pressure in the lower chamber 19 is lower than the pressure in the reservoir chamber 14, the flow path 95 is immediately opened away from the inner sheet portion 85 and the outer sheet portion 86 while pressing the easily deformable elastic leg 120. As a result, the disc valve 106 itself is a check valve that does not substantially generate a damping force. From the relationship with the extension-side disc valve 50 provided in the piston 17, the cylinder of the rod 22 is mainly used. The liquid flows from the reservoir chamber 14 to the lower chamber 19 substantially without resistance (to the extent that no damping force is generated) so as to compensate for the shortage of the liquid accompanying the protrusion from 11. Thus, the fluid flows through the flow channel 95 when the rod 22 and the piston 17 move to the extension side.

  When the outer annular portion 111 of the disc valve 106 is displaced by a predetermined amount in a direction away from the inner seat portion 85 and the outer seat portion 86 of the base valve body 76, the restricting member 110 abuts on this and restricts further displacement. .

  According to the shock absorber of the present embodiment described above, the disk valve 106 has the easily breakable portion 134 provided in the one support portion 125 connecting the inner annular portion 107 and the outer annular portion 111 broken. It will be. Therefore, when the base valve 71 is assembled, the disc valve 106 in which the inner annular portion 107 and the outer annular portion 111 are integrated with the support portion 125 is replaced with the other regulating member 105, the spacer 104, the disc valve 103, the base Like the valve body 76, the guide 108, the spring member 109, and the regulating member 110, the shaft portion 99 may be crimped after passing the shaft portion 99 of the pin member 98 through the pin insertion hole 126, thereby facilitating assembly work. it can. In other words, if the disc valve is a separate body before assembly, it was necessary to center the disc valve from the outside so as not to bite the guide when crimping the pin member, or to hold it so that it does not come off the guide. However, as with other components, the shaft portion 99 may be simply skewed and caulked, and the assembly operation can be facilitated. Further, if the easily breakable portion 134 is broken, the outer annular portion 111 is moved in the axial direction as a whole and is separated from the inner seat portion 85 and the outer seat portion 86, so that the valve opening amount can be secured. it can.

  Since the easily breakable portion 134 is set so as to be broken when the inner annular portion 107 receives the clamping axial force with the outer annular portion 111 in contact with at least the inner seat portion 85, the assembly work of the base valve 71 is performed. The easily-breakable portion 134 can be automatically broken to separate the outer annular portion 111 from the inner annular portion 107. Therefore, the assembly work can be further facilitated.

  In the above description, the disk valve 106 having one support portion 125 is described as an example, but the present invention can also be applied to a disk valve having a plurality of support portions. Will be formed.

  In the above description, the easily breakable portion 134 is set so as to be broken by the clamping axial force. However, in the state where the outer annular portion 111 is in contact with the inner sheet portion 85 and the inner annular portion 107 is clamped, the inner annular portion 107 is not broken. You may set so that it may fracture | rupture when the outer side annular part 111 displaces with the working fluid which flows through the hole 93. FIG. Also in this case, the outer annular portion can be automatically separated from the inner annular portion at the time of the first operation, so that the assembling work can be facilitated.

  In the above embodiment, the structure of the present invention of the disk valve 106, the guide 108 and the base valve body 76 described above can be applied to the disk valve 55 and its peripheral parts. Furthermore, the configuration of the disk valve 106 and the like can be applied to a valve externally attached to the cylinder 11.

  In the embodiment described above, a communication hole that communicates between the two chambers is formed, and a valve body in which an inner seat portion is formed on the center side and an outer seat portion is formed on the outer peripheral side across the communication hole, A shock absorber comprising an annular disc valve that is controlled to move in a radial direction with respect to the valve body and is detachably attached to the inner seat portion and the outer seat portion. The disc valve includes the inner seat portion. And an outer annular portion that forms a valve chamber with the outer seat portion, an inner annular portion that is clamped to the center side of the inner seat portion, and one point that connects the outer annular portion and the inner annular portion. The inner annular portion receives a clamping axial force with at least the outer annular portion in contact with the inner sheet portion, or at least the inner casing. The outer annular portion is displaced by the working fluid flowing through the communication hole in a state where the outer annular portion is in contact with the inner ring portion and the inner annular portion is clamped, and the support portion is broken. Features. Thereby, the disc valve can be handled in a state where the inner annular portion and the outer annular portion are integrated with each other at the time of assembly. In use, the support portion is broken and the outer annular portion is separated. Therefore, it is possible to facilitate the assembling work while ensuring the valve opening amount.

  In addition, since the inner annular part receives the clamping axial force or the outer annular part is displaced by the working fluid flowing through the communication hole, the support part breaks. It becomes a state. Therefore, an operation only for breaking is unnecessary, and the assembly operation can be further facilitated.

18 Upper room (room)
19 Lower room (room)
76 Base valve body (valve body)
85 Inner seat part 86 Outer seat part 93 Communication hole 106 Disc valve 107 Inner annular part 111 Outer annular part 125 Support part 134 Easily breakable part 140 Valve chamber

Claims (1)

A valve body in which a communication hole communicating between the two chambers is formed, and an inner seat part is formed on the center side and an outer seat part is formed on the outer peripheral side across the communication hole;
In a shock absorber provided with an annular disc valve that is radially movable with respect to the valve body and is arranged to be detachable from the inner seat portion and the outer seat portion,
The disc valve includes an outer annular portion that forms a valve chamber by the inner seat portion and the outer seat portion, an inner annular portion that is clamped to the center side of the inner seat portion, the outer annular portion, and the inner annular portion. The inner annular portion receives a clamping axial force in a state in which the outer annular portion is in contact with at least the inner sheet portion, or at least the The outer annular portion is displaced by the working fluid flowing through the communication hole in a state where the outer annular portion is in contact with the inner seat portion and the inner annular portion is clamped, so that the support portion is broken. A shock absorber characterized by.

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