JP2019173786A - Damper - Google Patents

Abstract

To provide a damper that is improved in assemblability.SOLUTION: In a damper, a harness 108 is soldered to soldering parts 159, 159 on one side of terminals 145, 146 through which a passage member 107 penetrates so as to prevent a passage 136 from crossing with the harness 108, thereby securing a soldering space; thus, a solenoid 101 has improved assemblability.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a shock absorber that generates a damping force by controlling a flow of a working fluid with respect to a stroke of a piston rod.

  Patent Document 1 discloses a so-called piston built-in type damping force adjusting hydraulic shock absorber in which a solenoid is built in between a piston and a piston rod. In this shock absorber, an air vent passage is formed between the piston rod and the solenoid coil for communicating the solenoid operating rod back pressure chamber with the oil chamber in the cylinder. In addition, a two-core cable harness is inserted into the hollow portion (shaft hole) of the piston rod, each lead wire of the harness is soldered to the corresponding terminal (terminal), and each coil magnet wire By fusing the ends to the corresponding terminals, the harness and the coil are conductively connected.

JP 2008-249107 A

In the above-described shock absorber, the air vent passage and the harness intersect within the yoke of the solenoid, so that the space for soldering between the harness and the terminal is reduced, and an improvement in assemblability (workability) has been demanded.
Then, this invention makes it a subject to provide the buffer which improved the assembly | attachment property.

  In order to solve the above problems, a shock absorber according to the present invention includes a cylinder in which a working fluid is sealed, a piston slidably fitted in the cylinder, one end connected to the piston, and the other end connected to the piston. A shock absorber comprising: a hollow piston rod extending from a cylinder to the outside; and a solenoid built in between the piston and the piston rod and adjusting a damping force characteristic based on a control current supplied to the coil. The solenoid includes a passage member having a passage extending in the radial direction and communicating with the chamber inside the cylinder, a terminal extending through the passage member in the axial direction, and one end of the terminal. A soldering portion for connecting a conductor inserted through the hollow portion of the piston rod, and a fusing portion provided on the other end side of the terminal for connecting the coil , Characterized in that it comprises a.

  According to the present invention, the assembling property of the shock absorber can be improved.

It is sectional drawing of the principal part of the shock absorber in this embodiment. It is a figure which expands and shows a part of FIG. It is operation | movement explanatory drawing of the valve spool in this embodiment. It is explanatory drawing of the solenoid in this embodiment, Comprising: It is sectional drawing by the cross section containing the channel | path formed in the channel | path member. It is explanatory drawing of the solenoid in this embodiment, Comprising: It is sectional drawing by the cross section containing a soldering part. It is explanatory drawing of the solenoid assembly in this embodiment, Comprising: It is the figure seen from the visual line corresponding to FIG. It is explanatory drawing of the solenoid assembly in this embodiment, Comprising: It is the figure seen from the visual line corresponding to FIG. It is explanatory drawing of the solenoid assembly in this embodiment, Comprising: It is a top view of a solenoid assembly. It is explanatory drawing of the solenoid in this embodiment, Comprising: It is a perspective view of the molded object which showed the mold part in the gray scale.

An embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of the main part of the shock absorber 1 according to the present embodiment. The shock absorber 1 is a so-called piston built-in type damping force adjusting hydraulic shock absorber in which a solenoid 101 is built in between the piston 3 and the piston rod 9. In the following description, an upper direction (upper side) and a lower direction (lower side) in FIG. 1 are defined as an upper direction (upper side) and a lower direction (lower side) in the shock absorber 1.

  Referring to FIG. 1, a piston 3 and a free piston 72 are slidably fitted inside the cylinder 2. The piston 3 divides the oil chamber in the cylinder 2 into two chambers, a cylinder upper chamber 2A and a cylinder lower chamber 2B. The free piston 72 partitions the upper cylinder lower chamber 2 </ b> B and the lower gas chamber 73. The shaft portion 6 of the piston bolt 5 is inserted into the shaft hole 4 of the piston 3. The lower end portion of the yoke 103 of the solenoid 101 is connected to the base portion 7 at the upper end of the piston bolt 5 by a screw coupling portion 10.

Referring to FIG. 2, a common passage 50 is formed in the shaft portion 6 of the piston bolt 5. The common passage 50 includes an axial passage 48 having an upper end opened at the center of the base portion 7, an axial passage 30 disposed on the same straight line as the axial passage 48 and closed at the lower end, and the axial passages 30, 48. It is comprised by the axial direction channel | path 49 which connects between. The common passage 50 has the largest inner diameter in the axial direction passage 30 and the smaller the inner diameter in the order of the axial direction passage 48 and the axial direction passage 49.

  Referring to FIG. 1, the upper end portion of the yoke 103 and the lower end portion (one end) of the hollow piston rod 9 are connected by a screw coupling portion 11. The screw coupling portion 11 is restrained from loosening by tightening a nut 12 screwed into the piston rod 9. The piston rod 9 is inserted through a rod guide 71 fitted to the upper end of the cylinder 2, and the upper end (the other end) extends from the cylinder 2 to the outside. The piston 3 is provided with an extension side passage 15 whose other end (upper end) opens to the cylinder upper chamber 2A and a contraction side passage 16 whose one end (lower end) opens to the cylinder lower chamber 2B. An extension side damping valve 17 that controls the flow of the working fluid in the extension side passage 15 is provided at the lower end of the piston 3. On the other hand, a compression side damping valve 18 that controls the flow of the working fluid in the compression side passage 16 is provided at the upper end of the piston 3.

  Referring to FIG. 2, the extension side damping valve 17 is fixed to the piston bolt 5 by an extension side main valve 20 seated on an annular seat part 19 formed on the outer peripheral side of the lower end surface of the piston 3 and a nut 21. A pilot case 22 and an extension-side back pressure chamber 23 formed between the back surface of the extension-side main valve 20 and the pilot case 22 are provided. The pressure in the extension-side back pressure chamber 23 acts on the extension-side main valve 20 in the valve closing direction. A washer 24, a retainer 25, and a disc valve 26 are provided between the nut 21 and the pilot case 22 in order from the lower side. The inner peripheral edge of the disc valve 26 is sandwiched between the inner peripheral edge of the pilot case 22 and the retainer 25. The extension-side main valve 20 is a packing valve in which an annular seal portion 20A made of an elastic body is in contact with the inner peripheral surface of the pilot case 22 over the entire circumference.

  The extension-side back pressure chamber 23 is always in communication with the cylinder lower chamber 2B through a passage 27 formed in the pilot case 22 and an orifice 26A formed in the disc valve 26. The disk valve 26 opens when the pressure in the extension-side back pressure chamber 23 reaches a predetermined pressure, and relieves the pressure in the extension-side back pressure chamber 23 to the cylinder lower chamber 2B. The extension-side back pressure chamber 23 is communicated with a radial passage 29 formed in the piston bolt 5 via a disk-type extension-side back pressure introduction valve 28. The radial passage 29 is communicated with the axial passage 30 of the piston bolt 5.

  The extension-side back pressure introduction valve 28 is a check valve that allows only the flow of working fluid from the radial passage 29 to the extension-side back pressure chamber 23. The extension-side back pressure introduction valve 28 is seated on an annular seat portion 31 formed on the upper surface of the pilot case 22. The seat portion 31 is provided on the inner peripheral side with respect to the passage 27. The inner peripheral edge of the extension-side back pressure introduction valve 28 is sandwiched between the inner peripheral edge of the pilot case 22 and the spacer 32. The extension-side back pressure chamber 23 communicates with the axial passage 30 via the orifice 28 and the radial passage 29 when the extension-side back pressure introduction valve 28 is opened. The axial passage 30 is communicated with the extension-side passage 15 via the radial passage 33 and the compression-side check valve 34. The radial passage 33 is always in communication with the expansion side passage 15 via the orifice 34 </ b> A of the compression side check valve 34. The compression side check valve 34 allows only the flow of the working fluid from the radial passage 33 to the extension side passage 15.

  The compression side damping valve 18 is fixed between the compression side main valve 36 seated on the annular seat portion 35 formed on the outer peripheral side of the upper end surface of the piston 3, and the base portion 7 of the piston bolt 5 and the piston 3. A pilot case 37 and a contraction-side back pressure chamber 38 formed between the back surface of the contraction-side main valve 36 and the pilot case 37 are provided. The pressure in the contraction side back pressure chamber 38 acts on the contraction side main valve 36 in the valve closing direction. The contraction-side main valve 36 is a packing valve in which an annular seal portion 36A made of an elastic body is in contact with the inner peripheral surface of the pilot case 37 over the entire circumference.

  The contraction-side back pressure chamber 38 is communicated with the cylinder upper chamber 2 </ b> A via a passage 42 formed in the pilot case 37 and a disc valve 41. The contraction-side back pressure chamber 38 is always communicated with the cylinder upper chamber 2 </ b> A via an orifice 41 </ b> A formed in the disk valve 41. The disc valve 41 is opened when the pressure in the contraction side back pressure chamber 38 reaches a predetermined pressure, and the pressure in the contraction side back pressure chamber 38 is relieved to the cylinder upper chamber 2A. The compression side back pressure chamber 38 is communicated with the radial passage 44 of the piston bolt 5 through a disk-type compression side back pressure introduction valve 43 and a circumferential groove 39 formed on the inner peripheral surface of the pilot case 37. . The radial passage 44 is communicated with the axial passage 48 of the piston bolt 5.

  The contraction-side back pressure introduction valve 43 is a check valve that allows only the flow of working fluid from the radial passage 44 to the contraction-side back pressure chamber 38. The contraction-side back pressure introduction valve 43 is seated on an annular seat portion 45 formed on the lower surface of the pilot case 37. The seat portion 45 is formed on the inner peripheral side with respect to the passage 42. The inner peripheral edge of the compression side back pressure introduction valve 43 is sandwiched between the inner peripheral edge of the pilot case 37 and the spacer 40. The contraction side back pressure chamber 38 is communicated with the radial passage 44 through the orifice 43A of the contraction side back pressure introduction valve 43 when the contraction side back pressure introduction valve 43 is opened.

  The axial passage 48 communicates with a radial passage 46 formed in the piston bolt 5. The radial passage 46 communicates with the contraction-side passage 16 via an extension-side check valve 47 provided in the piston 3. The radial passage 46 is always in communication with the contraction side passage 16 via the orifice 47A of the extension side check valve 47. The extension side check valve 47 allows only the flow of the working fluid from the radial passage 46 to the contraction side passage 16.

  The flow of the working fluid in the common passage 50 is controlled by a pilot valve. The pilot valve has a valve spool 51 (valve element) slidably fitted in the common passage 50. The valve spool 51 is a solid shaft and constitutes a pilot valve together with the piston bolt 5. The valve spool 51 is located above the axial passage 48, in other words, a base portion 52 slidably fitted to a portion above the radial passage 44, and a taper portion 53 located in the axial passage 48. A valve portion 54 continuous to the base portion 52, a fitting portion 55 located in the axial passage 30 in a closed state of the pilot valve (see FIG. 2), and a connection for connecting the fitting portion 55 and the valve portion 54 Part 56. The outer diameter of the valve spool 51 is the largest at the base 52, and decreases in the order of the valve 54, the fitting 55, and the connection 56. Further, the outer diameter of the valve portion 54 is larger than the inner diameter of the axial passage 49.

  The valve spool 51 is biased upward with respect to the piston bolt 5 by a valve spring 59 interposed between the spring receiving portion 57 of the fitting portion 55 and the spring receiving portion 58 of the piston bolt 5. The upper end of the base 52 is brought into contact with the lower end of the operating rod 106 of the solenoid 101. Referring to FIG. 3, the fitting portion 55 of the valve spool 51 is formed in a circular shape having a notch 65 having a two-sided cross section. When the control current to the solenoid 101 used as an actuator for controlling the movement of the valve spool 51 is 0 A (fail), the fitting portion 55 is stroked in the valve opening direction (upward direction in FIG. 3). And is fitted into the axial passage 49. Thus, a pair of orifices 62 that communicate between the axial passages 30 and 48 are formed between the fitting portion 55 and the axial passage 49.

  An annular seat portion 63 on which the valve portion 54 of the valve spool 51 is seated is formed at the opening peripheral edge of the upper end of the axial passage 49 (on the axial passage 48 side). A seating surface 54A formed in a tapered shape is formed on the outer peripheral edge of the lower end of the valve portion 54 (on the connection portion 56 side). When the seating surface 54A of the valve spool 51 is seated on the seat 63 of the piston bolt 5, that is, when the pilot valve is closed, the valve spool 51 has a pressure receiving surface A (see FIG. 3), the taper 53 receives the pressure on the axial passage 48 side on the annular pressure receiving surface B (see FIG. 3).

  Referring to FIG. 3, between the base 7 of the piston bolt 5 and the pilot case 37, the spool back pressure relief valve 81 (check valve), the retainer 82, the passage member 83, the disk 84, and the retainer 85 are sequentially arranged from the upper side. A disc valve 41 is provided. The inner peripheral edge of the disc valve 41 is sandwiched between the inner peripheral edge of the pilot case 37 and the retainer 85. The outer peripheral surface 83 </ b> A of the passage member 83 is fitted to the lower inner peripheral surface of the annular wall portion 7 </ b> A of the base portion 7 of the piston bolt 5. An annular groove 87 in which the O-ring 86 is mounted is formed on the outer peripheral surface 83 </ b> A of the passage member 83. The O-ring 86 provides a fluid-tight seal between the passage member 83 and the annular wall portion 7A of the base portion 7 of the piston bolt 5, in other words, between the circumferential groove 89 and the cylinder upper chamber 2A.

  The spool back pressure relief valve 81 has an inner peripheral edge sandwiched between the retainer 82 and the inner peripheral edge of the base 7 of the piston bolt 5, and an outer peripheral edge formed on the lower surface of the base 7 of the piston bolt 5. Sitting on 88. A circumferential groove 89 used as a space for opening the spool back pressure relief valve 81 is formed between the base 7 of the piston bolt 5 and the passage member 83. The spool back pressure relief valve 81 is a check valve that allows only the flow of working fluid from the spool back pressure chamber 70 to the circumferential groove 89.

  The spool back pressure chamber 70 communicates with the cylinder lower chamber 2B via the lower chamber side communication passage. The lower chamber side communication passage includes a circumferential groove 95, a passage 96, and a circumferential groove 94 formed in the base portion 7 of the piston bolt 5. As a result, the spool back pressure chamber 70 is communicated with the circumferential groove 89 via the circumferential groove 95, the passage 96, the circumferential groove 94, and the spool back pressure relief valve 81. Further, the lower chamber side communication passage includes a groove 90 formed in the passage member 83, a passage 91, a groove 92, and a groove 93 formed in the shaft portion 6 of the piston bolt 5. Thus, the circumferential groove 89 is communicated with the axial passage 48 via the groove 90, the passage 91, the groove 92, the groove 93, and the radial passage 44.

  4 and 5, the solenoid 101 is formed in a yoke 102, a coil 103, a core 104, a core 110 (stator), a plunger 105 (movable element), a hollow actuating rod 106, and a stepped cylindrical shape. A steel passage member 107 and a harness 108 (conductor) inserted through the hollow portion 109 of the piston rod 9 are provided. In the solenoid 101, when the coil 103 is energized, the cores 104 and 110 (stator) and the plunger 105 (movable element) are magnetized, and the plunger 105 extends and the operating rod 106 is propelled by the mutual attractive force. It is configured as follows.

  The yoke 102 includes a boss portion 111 to which the lower end portion of the piston rod 9 is connected, a flange portion 112 that extends radially outward (perpendicular to the axial direction) from the lower end of the boss portion 111, and an outer peripheral edge of the flange portion 112. And a cylindrical portion 113 extending from the portion to the piston 3 side (downward). Inside the cylindrical portion 113, there are provided a small inner diameter portion 114 that continues to the flange portion 112, and a large inner diameter portion 115 that is formed from the lower end (step portion) of the small inner diameter portion 114 to the lower end of the cylindrical portion 113. .

  A small outer diameter portion 116 of the passage member 107 is fitted into the small inner diameter portion 114 of the cylindrical portion 113 of the yoke 102. A space between the small inner diameter portion 114 of the yoke 102 and the small outer diameter portion 116 of the passage member 107 is sealed by an O-ring 118 (seal member). Further, the large outer diameter portion 117 of the passage member 107 is fitted into the large inner diameter portion 115 of the cylindrical portion 113 of the yoke 102. A space between the large inner diameter portion 115 of the yoke 102 and the large outer diameter portion 117 of the passage member 107 is sealed by an O-ring 119 (seal member).

  The core 110 is made of a magnetic material. The core 110 is formed in a substantially cylindrical shape having an axial hole with an inner diameter larger than the outer diameter of the operating rod 106. The core 110 is attached to the shaft hole 124 of the bobbin 123 of the coil 103 via the cylindrical case 120. A counterbore-shaped bearing holding portion that holds the bearing 138 is formed at the lower end of the shaft hole of the core 110. The operating rod 106 is slidably supported by a bearing 138 and a bush 134 described later.

  The core 104 includes a magnetic part 121 and a nonmagnetic part 122. The magnetic part 121 has a cylindrical part 125 fitted to the upper end part of the shaft hole 124 of the bobbin 123 of the coil 103 and a flange part 127 superimposed on the flange part 126 of the bobbin 123. The nonmagnetic portion 122 includes a cylindrical portion 128 and a flange portion 129 that is formed at the lower end of the cylindrical portion 128 and is superimposed on the flange portion 127 of the magnetic portion 121. The plunger 105 is coupled to the operating rod 106 and is slidably supported by the inner peripheral surface of the core 104, that is, the inner peripheral surfaces of the magnetic part 121 and the nonmagnetic part 122.

  At the upper end of the cylindrical portion 128 of the nonmagnetic portion 122, a boss portion 130 having an inner diameter equal to the cylindrical portion 128 and a smaller outer diameter is provided. The boss portion 130 of the nonmagnetic portion 122 is fitted into the opening portion 132 having a circular cross section provided on the lower end surface 107 </ b> A of the passage member 107. As a result, the passage member 107 is positioned coaxially with respect to the core 104. The passage member 107 is positioned in the axial direction with respect to the core 104 by bringing the inner peripheral edge of the lower end surface 107 </ b> A into contact with the upper end of the nonmagnetic portion 122.

  In the center of the passage member 107, a cylinder part 133 whose lower end opens to the opening part 132 is formed. A bush 134 that slidably supports the upper end portion of the operating rod 106 is fitted to the lower end of the cylinder portion 133. An operating rod back pressure chamber 135 is formed in the upper part of the cylinder part 133, that is, in the space above the bush 134. The working rod back pressure chamber 135 is formed in a passage 136 formed in the passage member 107 and extending in the radial direction, an annular passage 139 formed between the yoke 102 and the passage member 107, and a cylindrical portion 113 of the yoke 102. The cylinder upper chamber 2 </ b> A communicates with the air vent orifice 140. The passage 136 of the passage member 107 opens between the O-rings 118 and 119 on the outer peripheral surface 116 </ b> A of the small outer diameter portion 116.

  Referring to FIGS. 1, 2, and 4, the lower end of the operating rod 106 is brought into contact with the upper end of the valve spool 51 in the spool back pressure chamber 70. The spool back pressure chamber 70 communicates with the cylinder upper chamber 2A through the upper chamber side communication passage when the pilot valve is closed. Here, the upper chamber side communication passage includes a passage 141 (notch) formed in the lower end portion of the working rod 106, a passage 142 formed in the hollow portion of the working rod 106, a working rod back pressure chamber 135, a passage 136, It is constituted by an annular passage 139 and an air vent orifice 140.

Next, a conductor connection structure between the coil 103 and the harness 108 in the solenoid 101 will be described with reference to FIGS.
The solenoid 101 has a positive terminal 145 and a negative terminal 146. The passage member 107 is formed with long holes 147 and 148 (terminal insertion holes) through which the terminals 145 and 146 penetrate in the axial direction. The long holes 147 and 148 extend in an arc shape along the outer peripheral edge of the passage member 107 in plan view (see FIG. 8), and are formed symmetrically in plan view. The central angle of the center line of the long holes 147 and 148 is, for example, 120 °.

  The terminal 145 has an upright portion 151 that is inserted through the long hole 147 in a non-contact manner. A fixing portion 152 that is fixed to the flange portion 129 of the non-magnetic portion 122 of the core 104 is provided at the lower end of the upright portion 151 (the other end side of the terminal). The fixed portion 152 is formed in an arc shape in which the radius of the center line is equal to the radius of the long hole 147 and the width is smaller than the width of the long hole 147, and the intermediate portion in the circumferential direction is the flange portion of the nonmagnetic portion 122 of the core 104. It is held by a fixed piece 153 formed on 129. Note that the center angle of the center line of the terminal 145 is, for example, 120 °. Further, the upright portion 151 of the terminal 145 is positioned at the center in the length direction (direction along the center line) of the long hole 147 of the passage member 107 in plan view (see FIG. 8).

  6 and 7, the positive terminal (contact) of the coil 103 (see FIG. 1) is fused to the tip of the fixed portion 152 of the terminal 145 (the end opposite to the upright portion 151 side). A fusing portion 154 is formed. The fusing portion 154 is formed by vertically erecting the distal end portion of the fixed portion 152, and between the coil 103 and the passage member 107, in other words, the flange portion 129 and the passage member 107 of the nonmagnetic portion 122 of the core 104. It is arranged in a space 155 formed between the outer peripheral edge of the lower end surface 107A.

  On the other hand, a soldering portion 159 for connecting the lead wire 157 on the positive electrode side of the harness 108 is formed at the upper end (one end side of the terminal) of the upright portion 151 of the terminal 145. The soldering portion 159 is formed at the tip of the portion of the terminal 145 that protrudes from the upper end surface 107B of the passage member 107. The soldering portion 159 is formed with a slit 160 into which the lead wire 157 (conductor) is inserted from the horizontal direction (the horizontal direction in FIG. 6 and the vertical direction in FIG. 8). Here, the negative terminal 146 is a common component with the positive terminal 145. Therefore, the description regarding the terminal 146 is omitted.

  A cylindrical harness holding portion 161 is provided at the center of the upper end surface 107B of the passage member 107. In the harness holding portion 161, slits 163 and 164 into which the lead wires 157 and 158 of the harness 108 are inserted are formed. As shown in FIG. 8, the slit 163 is provided facing the long hole 147 side so as to face the soldering portion 159 of the terminal 145, and the slit 164 is opposed to the soldering portion 159 of the terminal 146. It is provided facing the long hole 148 side. As a result, the lead wire 157 is soldered to the soldering portion 159 of the terminal 145, and the lead wires 157 and 158 are placed on the same horizontal straight line while being soldered to the soldering portion 159 of the lead wire 158. Extend in the opposite direction.

  As shown in FIGS. 4, 5, and 9, the solenoid assembly (see FIGS. 6, 7, and 8) to which the harness 108 is connected is molded and integrated. 6 and 7, the coil 103 is not shown. The solenoid 101 is formed on the upper side with respect to the passage member 107 and is formed on the lower side with respect to the passage member 107 and a mold portion 165 (harness side mold portion) for molding the soldering portions 159 and 159 of the terminals 145 and 146. The molded portions 166 (coil side mold portions) for molding the fusing portions 154 and 154 of the terminals 145 and 146 and the coil 103, and the long holes 147 and 148 are filled and installed between the mold portions 165 and 166. A mold portion 167 is included.

  Here, in order to mold the solenoid assembly to form a molded body (see FIG. 9), the solenoid assembly is set on a molding die (not shown), and the mold member 165 is formed on the passage member 107. Mold resin is injected into a cavity (hereinafter referred to as “upper cavity”) on the end face 107B side. When the injected mold resin is filled in the upper cavity, the cavity on the lower end surface 107A side of the passage member 107 for forming the mold part 166 through the long holes 147 and 148 (hereinafter referred to as “lower cavity”). The lower cavity is filled. A notch 170 serving as a passage for allowing the mold resin to flow toward the coil 103 is formed on the outer peripheral edge of the flange 127 of the magnetic part 121 of the core 104.

Next, the flow of the working fluid will be described with reference to FIG.
During the contraction stroke of the piston rod 9 (hereinafter referred to as “during the contraction stroke”), the working fluid in the cylinder lower chamber 2B flows before the compression main valve 36 is opened. The orifice 47A of the valve 47, the radial passage 46, the axial passage 48, the radial passage 44, the contraction side back pressure introduction valve 43, the contraction side back pressure chamber 38, the passage 42 of the pilot case 37, and the orifice 41A of the disc valve 41 Flows through the cylinder upper chamber 2A.

  Then, when the valve spool 51 (valve element) moves and the valve portion 54 is separated from the seat portion 63, that is, when the pilot valve is opened, the working fluid in the cylinder lower chamber 2 </ b> B flows into the contraction side passage 16. , Through the orifice 47A of the extension check valve 47, the radial passage 46, the axial passage 48, the axial passage 49, the axial passage 30, the radial passage 33, the contraction check valve 34, and the extension passage 15. To the cylinder upper chamber 2A. Here, the valve opening pressure of the pilot valve can be adjusted by controlling the energization (current) to the coil 103 of the solenoid 101. At the same time, the pressure of the working fluid introduced from the compression side back pressure introduction valve 43 into the compression side back pressure chamber 38 is also adjusted, so that the valve opening pressure of the compression side main valve 36 can be controlled.

  During the expansion stroke of the piston rod 9 (hereinafter referred to as “during the expansion stroke”), the working fluid in the cylinder upper chamber 2A is subjected to the expansion-side passage 15 and the contraction-side check before the expansion-side main valve 20 is opened. The orifice 34A of the valve 34, the radial passage 33, the axial passage 30, the radial passage 29, the extension side back pressure introduction valve 28, the extension side back pressure chamber 23, the passage 27 of the pilot case 22, and the orifice 26A of the disk valve 26 Flows through the cylinder lower chamber 2B.

  When the valve spool 51 (valve element) moves and the valve portion 54 is separated from the seat portion 63, that is, when the pilot valve is opened, the working fluid in the cylinder upper chamber 2 </ b> A flows to the extension side passage 15. , Through the orifice 34A of the compression check valve 34, the radial passage 33, the axial passage 30, the axial passage 49, the axial passage 48, the radial passage 46, the expansion check valve 47, and the compression passage 16. To the cylinder lower chamber 2B. Here, the valve opening pressure of the pilot valve can be adjusted by controlling the energization (current) to the coil 103 of the solenoid 101. At the same time, the pressure of the working fluid introduced from the extension side back pressure introduction valve 28 to the extension side back pressure chamber 23 is also adjusted, so that the valve opening pressure of the extension side main valve 20 can be controlled.

  On the other hand, during the extension stroke, the working fluid in the cylinder upper chamber 2A flows into the spool back pressure chamber 70 through the upper chamber side communication passage. That is, the working fluid in the cylinder upper chamber 2A is throttled by the air vent orifice 140 (see FIG. 1) and passes through the annular passage 139, the passage 136, the working rod back pressure chamber 135, the passage 142, and the passage 141, and the spool back pressure. Flows into the chamber 70. The working fluid that has flowed into the spool back pressure chamber 70 flows to the cylinder lower chamber 2B through the lower chamber side communication passage. That is, the working fluid that has flowed into the spool back pressure chamber 70 is a circumferential groove 95, a passage 96, a circumferential groove 94, a spool back pressure relief valve 81, a circumferential groove 89, a groove 90, a passage 91, a groove 92, and a groove 93. , Flow through the radial passage 44, the axial passage 48, the radial passage 46, the orifice 47A of the expansion check valve 47, and the contraction passage 16 to the cylinder lower chamber 2B.

  Here, in the shock absorber of Patent Document 1 described above, since the air vent passage and the harness intersect within the yoke of the solenoid, the soldering space between the harness and the terminal becomes narrow, and the assemblability (workability) decreases. There was a problem.

  On the other hand, in the present embodiment, the passage member 107 is provided with a passage 136 formed with a passage 136 that extends in the radial direction and communicates the operating rod back pressure chamber 135 with the cylinder upper chamber 2A (the chamber inside the cylinder). Since the coil 103 and the harness 108 are conductively connected through the terminals 145 and 146 that extend in the axial direction through the terminals, the soldered portions 159 and 159 of the terminals 145 and 146 protruding from the upper end surface 107A of the passage member 107 are connected. In addition, the lead wires 157 and 158 of the harness 108 can be soldered, and the assemblability of the solenoid 101 can be improved.

Below, the effect of this embodiment is shown.
In the present embodiment, a cylinder (2) in which a working fluid is sealed, a piston (3) slidably fitted in the cylinder (2), one end connected to the piston (3), and the other end A hollow piston rod (9) extending from the cylinder (2) to the outside and a damping force built in between the piston (3) and the piston rod (9) and based on a control current supplied to the coil (103) A shock absorber (1) having a solenoid (101) for adjusting characteristics, wherein the solenoid (101) extends in a radial direction and communicates with a chamber (2A) inside the cylinder (2). A passage member (107) having a terminal, terminals (145, 146) extending through the passage member (107) in the axial direction, and one end side of the terminals (145, 146) provided on the piston rod (9) In the hollow part (109) Soldering parts (159, 159) for connecting the conductor (108) passed therethrough, and fusing parts (154, 154) for connecting the coil (103) provided on the other end side of the terminals (145, 146) .

  According to the present embodiment, the conductor (108) can be soldered to the soldering portions (159, 159) on one end side of the terminals (145, 146) that penetrate the passage member (107). In this embodiment, since the passage (136) and the conductor (108) do not intersect, it is possible to secure the soldering space and improve the assembling property of the solenoid (101). . Moreover, since the thermal influence of the hot tool around the soldered portions (159, 159) at the time of soldering is suppressed, the reliability of the product can be improved. Furthermore, since the passage (136) is formed in the radial direction with respect to the passage member (107), the processing of the passage (136) is easy.

  In the present embodiment, the solenoid (101) is provided on one end side of the passage member (107) and has a harness side mold portion (165) covering the soldering portions (159, 159), and the passage member (107). A coil-side mold part (166) that is provided on the other end side of the wire and covers the fusing part (154, 154), and the harness-side mold part (165) and the coil-side mold part (166) They are connected by mold resin (167) filled in the terminal insertion holes (147, 148) of the member (107).

  That is, in this embodiment, the space (mold cavity) for forming the harness side mold part (165) and the space for forming the coil side mold part (166) are connected to the terminal insertion holes (147, 148), the solenoid resin is integrated with the mold resin by moving (flowing) the mold resin from the harness side space to the coil side space via the terminal insertion holes (147, 148). A molded molded body (169) can be formed. Further, by increasing the width of the terminal insertion holes (147, 148) relative to the width of the terminals (145, 146), insulation between the terminals (145, 146) and the passage member (107) is secured. It is possible to prevent molding defects during molding.

  In the present embodiment, one end of the passage (136) opens to the outer peripheral surface (116A) of the passage member (107), and one end of the passage (107) is opened to the outer peripheral surface of the passage member (107). Since the annular seal members (118, 119) are provided so as to be sandwiched in the axial direction so as to be sandwiched, it is possible to eliminate the seal member that seals the end face of the coil 103. For this reason, the coil (103) It is not necessary to apply an axial force to the bobbin (123) of the coil (103), and the size can be reduced. Further, in the case of a face seal that seals the end face of the coil (103), the seal member may fall off during assembly, but in this embodiment, the outer peripheral surface of the passage member (107) is attached to the seal member (118, 119). As a result, the assembly of the solenoid (101) can be improved.

1 shock absorber, 2 cylinder, 2A cylinder upper chamber (chamber), 3 piston, 9 piston rod, 101 solenoid, 103 coil, 107 passage member, 108 harness (conductor), 109 hollow portion, 136 passage, 145, 146 terminal, 154 Fusing part, 159 Soldering part

Claims (3)

A cylinder filled with a working fluid, a piston slidably fitted in the cylinder, a hollow piston rod having one end connected to the piston and the other end extending from the cylinder to the outside, A solenoid built in between the piston and the piston rod and adjusting a damping force characteristic based on a control current supplied to the coil,
The solenoid includes a passage member having a passage extending in a radial direction and communicating with a chamber inside the cylinder, a terminal extending through the passage member in an axial direction, and one end of the terminal. A shock absorber comprising: a soldering portion for connecting a conductor inserted through a hollow portion of a piston rod; and a fusing portion provided on the other end side of the terminal for connecting the coil. The solenoid is provided on one end side of the passage member and covers the soldered portion, and the coil side mold portion is provided on the other end side of the passage member and covers the fusing portion. With
The shock absorber according to claim 1, wherein the rod-side mold part and the coil-side mold part are connected by a mold resin filled in a terminal insertion hole of the passage member. One end of the passage is open to the outer peripheral surface of the passage member, and an annular seal member is provided on the outer peripheral surface of the passage member so as to be spaced apart in the axial direction so as to sandwich the opening of one end of the passage. The shock absorber according to claim 1 or 2, wherein the shock absorber is provided.