WO2022249623A1 - 緩衝器及び緩衝器の製造方法 - Google Patents
緩衝器及び緩衝器の製造方法 Download PDFInfo
- Publication number
- WO2022249623A1 WO2022249623A1 PCT/JP2022/009334 JP2022009334W WO2022249623A1 WO 2022249623 A1 WO2022249623 A1 WO 2022249623A1 JP 2022009334 W JP2022009334 W JP 2022009334W WO 2022249623 A1 WO2022249623 A1 WO 2022249623A1
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- WO
- WIPO (PCT)
- Prior art keywords
- valve block
- chamber
- cylinder
- valve
- hydraulic fluid
- Prior art date
Links
- 239000006096 absorbing agent Substances 0.000 title claims description 28
- 230000035939 shock Effects 0.000 title claims description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 7
- 239000012530 fluid Substances 0.000 claims abstract description 99
- 238000013016 damping Methods 0.000 claims abstract description 34
- 238000004891 communication Methods 0.000 claims description 50
- 238000000638 solvent extraction Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 description 21
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000012856 packing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
- F16F9/325—Constructional features of cylinders for attachment of valve units
Definitions
- the present invention relates to a shock absorber that controls the flow of hydraulic fluid that accompanies the movement of a piston to adjust damping force, and a manufacturing method thereof.
- Patent Literature 1 discloses a shock absorber (hereinafter referred to as “conventional shock absorber”) in which an extension-side damping force generating mechanism and a contraction-side damping force generating mechanism are spaced apart along the axial direction of a cylinder. It is
- valve block of the extension side damping force generating mechanism and the valve block of the compression side damping force generating mechanism are assembled to the outer cylinder while the inside of the cylinder is filled with hydraulic fluid.
- hydraulic fluid was injected into the valve block.
- the hydraulic fluid flows from the valve block of the rebound damping force generating mechanism to the reservoir chamber via the communicating pipe and the valve block of the compression damping force generating mechanism. Therefore, the air inside the valve block (damping force generating mechanism) is not discharged, making it difficult to increase the filling rate of the hydraulic fluid in the valve block. As a result, it takes time to remove the air, and the number of man-hours increases.
- An object of the present invention is to provide a shock absorber and a manufacturing method of the shock absorber that can increase the filling rate of the hydraulic fluid in the valve block.
- the shock absorber of the present invention includes an outer cylinder, a cylinder provided in the outer cylinder and filled with a hydraulic fluid, and a cylinder provided between the cylinder and the outer cylinder, in which the hydraulic fluid and gas are sealed.
- a ring-shaped reservoir chamber formed with a cylinder, a piston slidably provided in the cylinder and partitioning the inside of the cylinder into two chambers, a first cylinder chamber and a second cylinder chamber, and the piston provided at one end, a piston rod with the other end protruding outside the cylinder; a valve block provided on the outer surface of the outer cylinder and having a hollow interior; a damping force variable mechanism that controls the flow of hydraulic fluid generated by the movement of the piston to generate a damping force; the first cylinder chamber and the first valve block chamber; a first communication passage for communication; a second communication passage for communication between the second cylinder chamber and the second valve block chamber; and an outer surface of the valve block and the first valve block chamber or the second valve block chamber.
- a method for manufacturing a shock absorber according to the present invention comprises: an outer cylinder; a cylinder provided in the outer cylinder and filled with a hydraulic fluid; , a piston slidably provided in the cylinder and partitioning the inside of the cylinder into two chambers, a first cylinder chamber and a second cylinder chamber, and the piston at one end.
- a piston rod the other end of which protrudes outside the cylinder
- a valve block which is provided on the outer surface of the outer cylinder and has a hollow interior; a variable damping force mechanism that is divided into two fluid chambers, two valve block chambers, and controls the flow of hydraulic fluid generated by the movement of the piston to generate a damping force; the first cylinder chamber and the first valve block; a second communication passage communicating between the second cylinder chamber and the second valve block chamber; an outer surface of the valve block and the first valve block chamber or the second valve block chamber; a third communication passage that communicates with the valve block chamber; and a first check valve that is provided in the third communication passage and allows hydraulic fluid to flow from the outer surface of the valve block to the first valve block chamber.
- a shock absorber with a high filling rate of hydraulic fluid in the valve block and a method of manufacturing the shock absorber.
- FIG. 1 is a conceptual diagram of the shock absorber according to the first embodiment, and is a cross-sectional view along an axial plane;
- FIG. 2 is an enlarged view of the valve block in FIG. 1;
- FIG. 10 is a conceptual diagram of the shock absorber according to the second embodiment, and is a cross-sectional view along an axial plane;
- FIG. 1 is a diagram conceptually showing a shock absorber 1 according to the first embodiment.
- the shock absorber 1 is a bi-flow hydraulic shock absorber provided vertically between the vehicle body and bogie of a railway vehicle (not shown).
- the shock absorber 1 has a double-cylinder structure in which an outer cylinder 10 is provided outside the cylinder 2 .
- a reservoir 18 (reservoir chamber) is provided between the cylinder 2 and the outer cylinder 10 .
- Hydraulic fluid is sealed in the cylinder 2 and hydraulic fluid and gas are sealed in the reservoir 18 .
- a piston 3 is slidably fitted in the cylinder 2 .
- the piston 3 divides the inside of the cylinder 2 into a first cylinder chamber 2A (lower chamber) and a second cylinder chamber 2B (upper chamber).
- a lower end (one end) of the piston rod 17 is fixed to the piston 3 .
- the piston rod 17 passes through the second cylinder chamber 2 ⁇ /b>B and has its upper end side (the other end side) inserted through the rod guide 15 to protrude to the outside of the cylinder 2 .
- An orifice passage 16 is provided in the rod guide 15 .
- the orifice passage 16 has one end open to the second cylinder chamber 2B and the other end connected to the upper end of the reservoir pipe 36 .
- the lower end of reservoir pipe 36 opens into the hydraulic fluid in reservoir 18 .
- the piston 3 has a pressure control valve that opens when the pressure of the working fluid on the side of the first cylinder chamber 2A reaches a set pressure and releases the pressure of the working fluid on the side of the first cylinder chamber 2A to the side of the second cylinder chamber 2B. 19 is provided.
- the piston has a pressure control that opens when the pressure of the hydraulic fluid on the side of the second cylinder chamber 2B reaches the set pressure and releases the pressure of the hydraulic fluid on the side of the second cylinder chamber 2B to the side of the first cylinder chamber 2A.
- a valve 20 is provided.
- a base valve 45 that separates the first cylinder chamber 2A and the reservoir 18 is provided at the lower end of the cylinder 2 .
- the base valve 45 is provided with a check valve 46 that allows hydraulic fluid to flow from the reservoir 18 to the first cylinder chamber 2A.
- the base valve 45 is provided with a pressure control valve 47 that opens when the pressure of the working fluid on the side of the first cylinder chamber 2A reaches a set pressure and releases the pressure of the working fluid on the side of the first cylinder chamber 2A to the reservoir 18. be done.
- a valve block 120 having a hollow interior is provided on the outer surface 44 of the outer cylinder 10 .
- the valve block 120 is provided with a concave portion 121 having an open upper end.
- the recess 121 has a center line parallel to the center line of the cylinder 2 and has a circular cross section taken along a plane perpendicular to the center line.
- the valve block 120 is provided with a cylinder 122 that shares a center line (axis line) with the recess 121 . That is, the centerline of cylinder 122 is parallel to the centerline of cylinder 2 .
- the cylinder 122 has a small diameter portion 123 whose lower end is closed and a large diameter portion 124 whose upper end is open to the bottom surface of the recess 121 .
- the cylinder 122 is closed by a yoke 94 attached to the upper end opening of the large diameter portion 124 .
- An annular sealing member 125 seals between the yoke 94 and the cylinder 122 (large diameter portion 124).
- the yoke 94 is fixed to the valve block 120 by tightening a cylindrical fixing member 126 screwed into the recess 121 .
- the valve block 120 is provided with a damping force variable mechanism 130 that controls the flow of hydraulic fluid generated by the movement of the piston 3 to generate a damping force.
- the variable damping force mechanism 130 is fitted in the small diameter portion 123 of the cylinder 122, and divides the inside of the cylinder 122 into two fluid chambers, a first valve block chamber 122A (lower chamber) and a second valve block chamber 122B (upper chamber). It has a partitioning piston 131 (valve block piston).
- the first valve block chamber 122A communicates with the first cylinder chamber 2A through a first communication passage 127
- the second valve block chamber 122B communicates with the second cylinder chamber 2B through a second communication passage 128. is communicated with.
- the piston 131 is provided with passages 132 and 133 that communicate the first valve block chamber 122A and the second valve block chamber 122B.
- the shaft portion 6 of the piston bolt 5 is inserted through the shaft hole 4 of the piston 131 .
- the piston bolt 5 has a head portion 7 provided on the upper end of the shaft portion 6 and a cylindrical portion 8 formed on the outer peripheral edge portion of the head portion 7 .
- the cylindrical portion 8 is open on the upper end side and has an outer diameter larger than that of the head portion 7 .
- a first valve mechanism 51 that controls the flow of hydraulic fluid in the passage 132 is provided on the upper end side of the piston 131 .
- the lower end side of the piston 131 is provided with a second valve mechanism 21 that controls the flow of hydraulic fluid in the passage 133 .
- the first valve mechanism 51 has a bottomed cylindrical first pilot case 52 attached to the shaft portion 6 of the piston bolt 5 .
- the first pilot case 52 has a bottom portion 57 and a cylindrical portion 56 opening on the piston 131 side.
- a first main valve 53 is provided on the piston 131 side of the first pilot case 52 .
- a first back pressure chamber 55 is formed inside the cylindrical portion 56 of the first pilot case 52 .
- the first valve mechanism 51 has a seat portion 54 which is formed on the outer peripheral side of the upper end surface of the piston 131 and which the first main valve 53 comes into contact with so that it can be seated and removed.
- a first back pressure chamber 55 is formed between the first pilot case 52 and the back surface of the first main valve 53 .
- the pressure in the first back pressure chamber 55 acts on the first main valve 53 in the valve closing direction.
- the first main valve 53 is a packing valve in which an annular packing 61 made of an elastic material contacts the inner peripheral surface of the cylindrical portion 56 of the first pilot case 52 over the entire circumference.
- the first back pressure chamber 55 communicates with the second valve block chamber 122B via a passage 62 formed in the bottom portion 57 of the first pilot case 52 and a sub valve 60.
- the sub-valve 60 opens when the pressure in the first back pressure chamber 55 reaches a predetermined pressure, and provides resistance to the flow of hydraulic fluid from the first back pressure chamber 55 to the second valve block chamber 122B. do.
- the first back pressure chamber 55 communicates through a passage 62 with a pressure receiving chamber 182 formed between the first pilot case 52 and the sub valve 60 .
- the pressure receiving chamber 182 is sector-shaped by a plurality of sheet portions 183 provided on the upper end surface of the first pilot case 52 . Inside the plurality of seat portions 183, passages 62 are opened respectively.
- the first back pressure chamber 55 includes a first communication passage 127, a first valve block chamber 122A, a passage 132, and an orifice formed at the outer peripheral edge of the disk valve 70 from the first cylinder chamber 2A (lower chamber).
- notch reference numerals omitted
- notch 72 of piston 131 annular passage 71, radial passage 58, axial passage 12, radial passage 64, width across flat portion 77 formed in shaft portion 6 of piston bolt 5 , an annular passage 68, and a notch (reference numerals omitted) forming an orifice formed in the inner peripheral edge of the check valve 63, the hydraulic fluid is introduced.
- An annular seat portion 65 is provided on the lower end surface of the first pilot case 52 .
- the seat portion 65 defines an annular pressure receiving chamber 184 provided on the outer periphery of the inner peripheral portion of the bottom portion 57 .
- a first back pressure introduction passage is formed in the first valve mechanism 51 to communicate the second valve block chamber 122B and the first back pressure chamber 55 .
- the first back pressure introduction passage introduces the hydraulic fluid in the second valve block chamber 122B into the first back pressure chamber 55 via the back pressure introduction passage 181 and the check valve 63 .
- the second valve mechanism 21 has a bottomed cylindrical second pilot case 22 attached to the shaft portion 6 of the piston bolt 5 .
- the second pilot case 22 has a bottom portion 27 and a cylindrical portion 26 opening on the piston 131 side.
- a second main valve 23 is provided on the piston 131 side of the second pilot case 22 .
- a second back pressure chamber 25 is formed inside the cylindrical portion 26 of the second pilot case 22 .
- the second valve mechanism 21 has a seat portion 24 which is formed on the outer peripheral side of the lower end face of the piston 131 and which the second main valve 23 abuts on so as to be seatable and removable.
- a second back pressure chamber 25 is formed between the second pilot case 22 and the back surface of the second main valve 23 .
- the pressure in the second back pressure chamber 25 acts on the second main valve 23 in the valve closing direction.
- the second main valve 23 is a packing valve in which an annular packing 31 made of an elastic material contacts the inner peripheral surface of the cylindrical portion 26 of the second pilot case 22 over the entire circumference.
- the second back pressure chamber 25 communicates with the first valve block chamber 122A via a passage 32 formed in the bottom portion 27 of the second pilot case 22 and the sub-valve 30 .
- the sub-valve 30 opens when the pressure in the second back pressure chamber 25 reaches a predetermined pressure, and provides resistance to the flow of hydraulic fluid from the second back pressure chamber 25 to the first valve block chamber 122A. do.
- the second back pressure chamber 25 communicates through a passage 32 with a pressure receiving chamber 172 formed between the second pilot case 22 and the sub valve 30 .
- the pressure receiving chamber 172 is sector-shaped by a plurality of sheet portions 173 provided on the lower end surface of the second pilot case 22 . Inside the plurality of seat portions 173, passages 32 are opened respectively.
- the second back pressure chamber 25 includes a second communication passage 128, a second valve block chamber 122B, a passage 133, and an orifice formed at the outer peripheral edge of the disk valve 40 from the second cylinder chamber 2B (upper chamber).
- notch reference numerals omitted
- Hydraulic fluid is introduced through a notch (reference numeral omitted) that constitutes the orifice.
- An annular seat portion 35 is provided on the upper end surface of the second pilot case 22 .
- the seat portion 35 defines an annular pressure receiving chamber 174 provided on the outer periphery of the inner peripheral portion of the bottom portion 27 .
- the second valve mechanism 21 is formed with a second back pressure introduction path that communicates the first valve block chamber 122A and the second back pressure chamber 25 .
- the second back pressure introduction passage introduces the hydraulic fluid in the first valve block chamber 122 ⁇ /b>A into the second back pressure chamber 25 via the back pressure introduction passage 171 and the check valve 33 .
- valve parts constituting the first valve mechanism 51 and the second valve mechanism 21 have a head portion of the piston bolt 5 by tightening a nut 78 attached to a threaded portion (reference numerals omitted) of the shaft portion 6 of the piston bolt 5 .
- Axial force is generated by pressurizing between 7 and washer 79 .
- a control passage 11 is formed in the piston bolt 5 (shaft member).
- the control passage 11 includes an axial passage 12 whose upper end opens to the end face 9 of the head of the piston bolt 5 , an axial passage 13 whose lower end opens to the axial passage 13 , and an axial passage 13 whose upper end opens to the axial passage 13 . and a directional passage 14 .
- the inner diameter of the control passage 11 is the largest in the axial passage 13 and the smallest in the axial passage 14 .
- the shaft portion 6 of the piston bolt 5 is divided into upper and lower parts, and an axial passage 14 is formed in the lower portion of the shaft portion 6 .
- the control passage 11 has a radial passage 34 communicating with the axial passage 14 .
- the control passage 11 has a radial passage 39 that communicates with the radial passage 34 via the axial passage 14 .
- the second back pressure chamber 25 includes an orifice (reference numerals omitted) provided in the inner peripheral portion of the check valve 33, an annular passage 38 formed in the inner peripheral portion of the bottom portion 27 of the second pilot case 22, a radial passage 39, and through the axial passage 14 to communicate with the axial passage 34 .
- the radial passage 34 includes an annular passage 41 formed at the lower end of the shaft hole 4 of the piston 131, a plurality of notches 42 formed in the inner circumference of the piston 131, and a disc valve 40 provided in the piston 131. through the passage 133 .
- the disk valve 40 abuts on an annular seat portion 43 of the piston 131 which is provided on the inner peripheral side of the opening of the seat portion 24 and the passage 133 so as to be separable and seatable.
- Disk valve 40 is a check valve that allows hydraulic fluid to flow from radial passage 34 to passage 133 .
- a notch (not shown) forming an orifice is formed in the outer peripheral edge of the disc valve 40 .
- the first back pressure chamber 55 includes an orifice (not numbered) provided in the inner periphery of the check valve 63, an annular passage 68 formed in the inner periphery of the bottom portion 57 of the first pilot case 52, and a piston bolt. It communicates with a radial passage 64 formed in the shaft portion 6 of the piston bolt 5 via a width across flat portion 77 formed in the shaft portion 6 of the piston bolt 5 .
- the radial passage 64 includes the axial passage 12, the radial passage 58 formed in the shaft portion 6 of the piston bolt 5, the annular passage 71 formed in the upper end portion of the shaft hole 4 of the piston 131, and the inner peripheral portion of the piston 131. It communicates with the passage 132 via a plurality of notches 72 formed in the piston 131 and a disc valve 70 provided on the piston 131 .
- the disk valve 70 abuts on an annular seat portion 73 of the piston 131 provided on the inner peripheral side of the opening of the seat portion 54 and the passage 132 so as to be separable and seatable.
- Disc valve 70 is a check valve that allows hydraulic fluid to flow from radial passage 58 to passage 132 .
- a notch (not shown) forming an orifice is formed in the outer peripheral edge of the disc valve 70 .
- the flow of hydraulic fluid in the control passage 11 is controlled by a pilot valve 81 (pilot control valve).
- the pilot valve 81 has a valve spool 82 slidably provided in the control passage 11 and a seat portion 83 formed around the opening of the axial passage 14 .
- the valve spool 82 is formed of a solid shaft, and has a sliding portion 84 inserted into the axial passage 12 and a valve body 85 that abuts on the seat portion 83 in a separable manner.
- An outer flange-shaped spring receiver 88 is formed on the head 87 of the valve spool 82 .
- the spring receiver 88 is connected to the inner peripheral portion of a spring disc 113 that biases the valve body 85 in the valve opening direction. Due to the biasing force of the spring disc 113 , the head 87 of the valve spool 82 is brought into contact (pressed) against the lower end surface 93 (reference numeral omitted) of the operating rod 92 of the solenoid 91 .
- a bottomed cylindrical cap 115 with an open upper end is attached to the head 7 of the piston bolt 5 .
- An annular seal member 102 seals between the cap 115 and the head portion 7 of the piston bolt 5 .
- An annular second chamber 136 is formed between the cap 115 and the head 7 of the piston bolt 5 .
- the cap 115 is provided with an insertion hole 89 through which the shaft portion 6 of the piston bolt 5 is inserted. The insertion hole 89 communicates with the width across flat portion 77 formed in the shaft portion 6 .
- a fail-safe valve 111 is configured in the first chamber 135 .
- the fail-safe valve 111 has a disk 112 (valve seat) against which the spring receiver 88 (valve body) of the head 87 of the valve spool 82 is removably seated.
- the outer peripheral edges of the disc 112 and the spring disc 113 are held between the head 7 of the piston bolt 5 and the core 99 of the solenoid 91 .
- the core of the solenoid 91 is composed of an upper core 98 and a lower core 99 which are divided vertically (in the axial direction) via the holder 104 .
- valve body 85 of the valve spool 82 has a notch 86 that forms an orifice by fitting into the axial passage 12 .
- the valve spool 82 moves in the valve opening direction of the pilot valve 81 (upward in FIG. 2) and fits into the axial passage 12 . combined.
- valve body 85 of the valve spool 82 when the coil 95 of the solenoid 91 is energized, the valve body 85 of the valve spool 82 is seated on the seat portion 83, and the pilot valve 81 is closed.
- the pilot valve 81 When the pilot valve 81 is closed, the valve body 85 of the valve spool 82 receives pressure on the side of the axial passage 14 by a circular pressure receiving surface having the same area as the opening area of the axial passage 14, and the sliding portion 84 is , the pressure on the side of the axial passage 12 is received by an annular pressure-receiving surface having the same area as the cross-sectional area of the sliding portion 84 minus the cross-sectional area of the neck of the valve body 85 (reference numeral omitted).
- the opening pressure of the pilot valve 81 is adjusted by controlling the energization of the coil 95.
- the biasing force of the spring disk 113 and the thrust generated by the plunger 96 are balanced, and the valve body 85 is separated from the seat portion 83 by a certain distance.
- a plunger 96 is coupled to the outer circumference of the operating rod 92 .
- the plunger 96 generates thrust by energizing the coil 95 .
- the operating rod 92 is guided vertically (axially) by a bush 100 attached to the core lid 106 and a bush 110 attached to the core 99 .
- An intra-rod passage 97 is formed inside the operating rod 92 .
- a sealing member 116 seals between the lower end of the bottomed cylindrical yoke 94 and the core 99 .
- An annular passage 117 is formed between the piston bolt 5 , the yoke 94 and the core 99 .
- the annular passage 117 communicates with the second valve block chamber 122B via a passage 118 provided in the cylindrical portion 8 of the piston bolt 5.
- a spool back pressure chamber 101 is formed inside the core 99 (outer periphery of the head portion 87 of the valve spool 82).
- the spool back pressure chamber 101 communicates with the rod back pressure chamber 103 via the notch 93 in the head portion 87 of the valve spool 82 and the intra-rod passage 97 .
- the yoke 94 has a cable insertion hole 142 through which the cable 141 is inserted.
- Each conductor of electric wires 143 and 144 on one end side of cable 141 is connected to terminals 145 and 146 of solenoid 90 .
- Terminal 145 is connected to the positive terminal of coil 95 and terminal 146 is connected to the negative terminal of coil 95 .
- electric wires 143 and 144 on the other end side of the cable 141 are connected to a connector (not shown) on the vehicle side (power supply device side).
- the outer surface 150 of the valve block 120 is provided with an injection port 151 used in the process of injecting the hydraulic fluid.
- the valve block 120 is provided with a third communication passage 152 that communicates the injection port 151 with the first valve block chamber 122A and the second valve block chamber 122B. After the hydraulic fluid is injected into the first valve block chamber 122A and the second valve block chamber 122B through the third communication passage 152, a plug (not shown) is attached to the injection port 151. As shown in FIG.
- the third communication passage 152 has a third passage 155 with one end connected to the injection port 151 .
- the third passage 152 has one end connected to the first valve block chamber 122A and the other end connected to the other end of the third passage 155, and one end connected to the second valve block chamber 122B. and a second passage 154 whose other end is connected to the other end of the third passage 155 and the other end of the first passage 153 .
- the injection port 151 communicates with the first cylinder chamber 2A (lower chamber) via a third passage 155, a first passage 153, a first valve block chamber 122A, and a first communication passage 127.
- the injection port 151 communicates with the second cylinder chamber 2B (upper chamber) via a third passage 155, a second passage 154, a second valve block chamber 122B, and a second communication passage 128.
- the third passage 155 is provided with a third check valve 158 that allows the hydraulic fluid to flow from the inlet 151 to the first passage 153 and the second passage 154 .
- the first passage 153 is provided with a first check valve 156 that allows hydraulic fluid to flow from the third passage 155 to the first valve block chamber 122A.
- the second passage 154 is provided with a second check valve 157 that allows the hydraulic fluid to flow from the third passage 155 to the second valve block chamber 122B.
- the first check valve 156 has a valve spring 156A (first biasing means) that biases the valve body in the valve closing direction.
- the second check valve 157 has a valve spring 157A (second biasing means) that biases the valve body in the valve closing direction.
- the biasing force of the valve spring 156A is greater than the biasing force of the valve spring 157A.
- hydraulic fluid in the first cylinder chamber 2A (lower chamber) is introduced into the first valve block chamber 122A of the valve block 120 via the first communication passage 127. As shown in FIG.
- the hydraulic fluid introduced into the first valve block chamber 122A passes through the passage 132, the notch (orifice) of the disk valve 70, the notch 72 of the piston 131, the annular passage 71, the radial passage 58, the axial passage 12, the radial It is introduced into the first back pressure chamber 55 via the passage 64 , the width across flat portion 77 of the shaft portion 6 of the piston bolt 5 , the annular passage 68 , and the notch (orifice) of the check valve 63 .
- the hydraulic fluid introduced into the first valve block chamber 122A is introduced into the second back pressure chamber 25 through the second back pressure introduction passage, that is, the back pressure introduction passage 171 and the check valve 33. be. This prevents the second main valve 23 from opening due to the pressure in the first valve block chamber 122A during the compression stroke.
- the hydraulic fluid introduced into the second back pressure chamber 25 passes through the notch (orifice) of the check valve 33, the annular passage 38, the radial passage 39, the axial passage 14, the radial passage 34, the annular passage 41, and the piston 131. It flows through notch 42, disk valve 40, and passageway 133 to second valve block chamber 122B.
- notch 42, disk valve 40, and passageway 133 to second valve block chamber 122B.
- hydraulic fluid in the second cylinder chamber 2B (upper chamber) is introduced into the second valve block chamber 122B of the valve block 120 via the second communication passage 128.
- the hydraulic fluid introduced into the second valve block chamber 122B passes through the passage 133, the notch (orifice) of the disk valve 40, the notch 42 of the piston 131, the annular passage 41, the radial passage 34, the axial passage 14, the radial It is introduced into the second back pressure chamber 25 via the passage 39 , the annular passage 38 and the notch (orifice) of the check valve 33 .
- the hydraulic fluid introduced into the second valve block chamber 122B is introduced into the first back pressure chamber 55 through the first back pressure introduction passage, that is, the back pressure introduction passage 181 and the check valve 63. be. This prevents the first main valve 53 from opening due to the pressure in the second valve block chamber 122B during the extension stroke.
- the hydraulic fluid introduced into the first back pressure chamber 55 flows through the notch (orifice) of the check valve 63, the annular passage 68, the radial passage 64, the axial passage 12, the radial passage 58, the annular passage 71, and the piston 131. It flows through notch 72, disc valve 70, and passageway 132 to first valve block chamber 122A.
- notch 72, disc valve 70, and passageway 132 to first valve block chamber 122A.
- the process of injecting the working fluid will be mainly described.
- the cylinder 2 and the valve block 120 are assembled to the outer cylinder 10 .
- a base valve 45 is attached to the cylinder 2 .
- the piston 3 , the piston rod 17 , the rod guide 15 and the like are assembled to the cylinder 2 .
- variable damping force mechanism 130 is assembled to the valve block 120 .
- the piston 131 causes the inside of the cylinder 122 of the valve block 120 to communicate with the first cylinder chamber 2A (lower chamber) in the cylinder 2 via the first communication passage 127, and the second valve block chamber 122A communicates with the second cylinder chamber 2A. and a second valve block chamber 122B communicating with a second cylinder chamber 2B (upper chamber) in the cylinder 2 via a communication passage 128.
- the hydraulic fluid is injected from the injection port 151 of the valve block 120 .
- the hydraulic fluid injected from the inlet 151 opens the second check valve 157 against the biasing force of the valve spring 157A (second biasing means), and flows through the third passage 155 and the second passage 154. Then, it is introduced into the second valve block chamber 122B.
- the hydraulic fluid introduced into the second valve block chamber 122B flows through the second communication passage 128 into the second cylinder chamber 2B and fills the second cylinder chamber 2B. Also, the hydraulic fluid introduced into the second valve block chamber 122 ⁇ /b>B passes through the passage 133 and the control passage 11 and fills the second back pressure chamber 25 . Furthermore, the hydraulic fluid introduced into the second valve block chamber 122B is filled into the first chamber 135 via the passage 118 and the annular passage 117. As shown in FIG.
- the hydraulic fluid introduced into the first valve block chamber 122A flows through the first communication passage 127 into the first cylinder chamber 2A and fills the first cylinder chamber 2A. Also, the hydraulic fluid introduced into the first valve block chamber 122 ⁇ /b>A fills the first back pressure chamber 55 via the passage 132 and the control passage 11 . Furthermore, the hydraulic fluid introduced into the first valve block chamber 122 ⁇ /b>A fills the second chamber 136 via the passage 132 , the control passage 11 , and the width across flat portion 77 of the shaft portion 6 of the piston bolt 5 .
- the hydraulic fluid injected into the valve block flows from the extension side damping force generation mechanism to the reservoir chamber via the communicating pipe and the compression side damping force generation mechanism. For this reason, the air inside the variable damping force mechanism is not discharged, making it difficult to increase the filling rate of the hydraulic fluid inside the valve block (damping force generating mechanism), and it takes time to bleed the air.
- the injection port 151 is provided in the outer surface 150 of the valve block 120, and the injection port 151 and the first valve block chamber 122A are separated from each other by the third passage 155 and the first passage 153 (third series).
- the inlet 151 and the second valve block chamber 122B communicated with each other through a third passage 155 and a second passage 154 (third communication passage 152).
- the filling rate of the hydraulic fluid inside the valve block 120 (damping force variable mechanism 130) can be increased, and the time required for air bleeding from the valve block 120 can be greatly reduced.
- the biasing force of the valve spring 156A (biasing means) of the first check valve 156 is made larger than the biasing force of the valve spring 157A (biasing means) of the second check valve 157. Therefore, after the second valve block chamber 122B is filled with hydraulic fluid, the first valve block chamber 122A can be filled with hydraulic fluid. As a result, the air inside the variable damping force mechanism 130 can be discharged more smoothly, and the filling rate of the hydraulic fluid inside the valve block 120 (variable damping force mechanism 130) can be further increased.
- the biasing force of the valve spring 157A (biasing means) of the second check valve 157 is made larger than the biasing force of the valve spring 156A (biasing means) of the first check valve 156, and the first valve block chamber is closed.
- the second valve block chamber 122B may be filled with hydraulic fluid after 122A is filled with hydraulic fluid.
- a third passage 155 having one end connected to the inlet 151 and a first passage having one end connected to the first valve block chamber 122A and the other end connected to the other end of the third passage 155 153 and a second passage 154 having one end connected to the second valve block chamber 122B and the other end connected to the other end of the third passage 155 constitute the third communication passage 152 .
- the hydraulic fluid injected from the injection port 151 passes through the third communication passage 152, the first valve block chamber 122A, the passage 132, the notch (orifice) formed in the disk valve 70, and the control passage 11. and introduced into the first back pressure chamber 55 .
- the hydraulic fluid injected from the injection port 151 passes through the third communication passage 152, the second valve block chamber 122B, the passage 133, the notch (orifice) formed in the disc valve 40, and the control passage 11. It is introduced into the second back pressure chamber 25 and the pilot chamber (axial passage 13).
- the third communication path 152 is configured by providing the fourth path 161 that connects the first path 153, the second path 154, and the third path 155 to the control path 11.
- the fourth passage 161 is provided with a fourth check valve 162 that allows the hydraulic fluid to flow from the inlet 151 (the third passage 155 ) to the control passage 11 .
- the third passage 155 is not provided with a check valve. may be provided to configure the third communication path 152 .
- the present invention is not limited to the above-described embodiments, and includes various modifications.
- the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.
- part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
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Abstract
Description
本発明の緩衝器の製造方法は、外筒と、前記外筒内に設けられ、内部が作動液で満たされたシリンダと、前記シリンダと前記外筒との間に設けられ、作動液と気体とが封入された環状のリザーバ室と、前記シリンダ内に摺動可能に設けられ、該シリンダ内を第1シリンダ室と第2シリンダ室との2室に区画するピストンと、一端に前記ピストンが設けられ、他端側が前記シリンダの外部へ突出したピストンロッドと、前記外筒の外側面に設けられ、内部が中空に形成されたバルブブロックと、前記バルブブロック内を第1バルブブロック室と第2バルブブロック室との2つの液室に区画し、前記ピストンの移動により生じる作動液の流れを制御して減衰力を発生させる減衰力可変機構と、前記第1シリンダ室と前記第1バルブブロック室とを連通する第1連通路と、前記第2シリンダ室と前記第2バルブブロック室とを連通する第2連通路と、前記バルブブロックの外側面と前記第1バルブブロック室又は前記第2バルブブロック室とを連通する第3連通路と、前記第3連通路に設けられ、前記バルブブロックの外側面から前記第1バルブブロック室への作動液の流れを許容する第1逆止弁と、前記第3連通路に設けられ、前記バルブブロックの外側面から前記第2バルブブロック室への作動液の流れを許容する第2逆止弁と、を備える緩衝器の製造方法であって、前記外筒に前記シリンダと前記バルブブロックとを組み付ける工程と、前記バルブブロックに前記減衰力可変機構を組み付ける工程と、前記第3連通路から前記バルブブロック内に作動液を注入する工程と、を有することを特徴とする。
本発明の第1実施形態を添付した図を参照して説明する。
図1は、第1実施形態に係る緩衝器1を概念的に示す図である。便宜上、図1における上下方向をそのまま「上下方向」と称する。緩衝器1は、鉄道車両(図示省略)の車体と台車との間に縦に設けられるバイフロー型油圧緩衝器である。
縮み行程時には、第1シリンダ室2A(下室)の作動液が、第1連通路127を経由してバルブブロック120の第1バルブブロック室122Aに導入される。第1バルブブロック室122Aに導入された作動液は、通路132、ディスクバルブ70の切欠き(オリフィス)、ピストン131の切欠き72、環状通路71、径方向通路58、軸方向通路12、径方向通路64、ピストンボルト5の軸部6の二面幅部77、環状通路68、及びチェックバルブ63の切欠き(オリフィス)を経由して第1背圧室55に導入される。
まず、外筒10にシリンダ2とバルブブロック120とを組み付ける。なお、シリンダ2にはベースバルブ45が装着されている。外筒10にシリンダ2とバルブブロック120とを組付け後、シリンダ2に、ピストン3、ピストンロッド17、及びロッドガイド15等を組み付ける。
第1実施形態によれば、注入口151から第1バルブブロック室122A及び第2バルブブロック室122Bへ作動液を直接注入することが可能であり、減衰力可変機構130の内部のエアを円滑に排出することができる。その結果、バルブブロック120(減衰力可変機構130)の内部における作動液の充填率を高めることが可能であり、バルブブロック120のエア抜きに要する時間を大幅に削減することができる。
また、第1実施形態では、第1逆止弁156の弁ばね156A(付勢手段)の付勢力を、第2逆止弁157の弁ばね157A(付勢手段)の付勢力よりも大きくしたので、第2バルブブロック室122Bに作動液を充填させた後、第1バルブブロック室122Aに作動液を充填させることができる。これにより、減衰力可変機構130の内部のエアをより円滑に排出することが可能であり、バルブブロック120(減衰力可変機構130)の内部における作動液の充填率をより高めることができる。
なお、第2逆止弁157の弁ばね157A(付勢手段)の付勢力を、第1逆止弁156の弁ばね156A(付勢手段)の付勢力よりも大きくし、第1バルブブロック室122Aに作動液を充填させた後、第2バルブブロック室122Bに作動液を充填させるように構成してもよい。
次に、図3を参照して第2実施形態を説明する。ここでは、第1実施形態との相違部分を説明する。なお、第1実施形態との共通の構成については、同一の称呼及び符号を用いる。
Claims (5)
- 緩衝器であって、該緩衝器は、
外筒と、
前記外筒内に設けられ、内部が作動液で満たされたシリンダと、
前記シリンダと前記外筒との間に設けられ、作動液と気体とが封入された環状のリザーバ室と、
前記シリンダ内に摺動可能に設けられ、該シリンダ内を第1シリンダ室と第2シリンダ室との2室に区画するピストンと、
一端に前記ピストンが設けられ、他端側が前記シリンダの外部へ突出したピストンロッドと、
前記外筒の外側面に設けられ、内部が中空に形成されたバルブブロックと、
前記バルブブロック内を第1バルブブロック室と第2バルブブロック室との2つの液室に区画し、前記ピストンの移動により生じる作動液の流れを制御して減衰力を発生させる減衰力可変機構と、
前記第1シリンダ室と前記第1バルブブロック室とを連通する第1連通路と、
前記第2シリンダ室と前記第2バルブブロック室とを連通する第2連通路と、
前記バルブブロックの外側面と前記第1バルブブロック室又は前記第2バルブブロック室とを連通する第3連通路と、
前記第3連通路に設けられ、前記バルブブロックの外側面から前記第1バルブブロック室への作動液の流れを許容する第1逆止弁と、
前記第3連通路に設けられ、前記バルブブロックの外側面から前記第2バルブブロック室への作動液の流れを許容する第2逆止弁と、を備えることを特徴とする緩衝器。 - 請求項1に記載の緩衝器において、
前記第1バルブブロック室及び前記第2バルブブロック室は、前記シリンダの中心線に対して平行に配置されることを特徴とする緩衝器。 - 請求項1又は2に記載の緩衝器において、
前記第1逆止弁は、閉弁方向へ作用する第1付勢手段を有し、
前記第2逆止弁は、閉弁方向へ作用する第2付勢手段を有し、
前記第1付勢手段の付勢力は、前記第2付勢手段の付勢力よりも大きいことを特徴とする緩衝器。 - 請求項1乃至3のいずれか1項に記載の緩衝器において、
前記減衰力可変機構は、
前記バルブブロック内を前記第1バルブブロック室と前記第2バルブブロック室とに区画するバルブブロックピストンと、
前記バルブブロックピストンが組付けられる軸部材と、
前記軸部材に設けられ、前記第1バルブブロック室と前記第2バルブブロック室とを連通する制御流路と、
前記制御流路内を流れる作動液の流量を制御するソレノイドと、を備え、
前記第1連通路、前記第2連通路、及び前記第3連通路を前記制御通路に連通する第4通路を有することを特徴とする緩衝器。 - 緩衝器の製造方法であって、前記緩衝器は、
外筒と、
前記外筒内に設けられ、内部が作動液で満たされたシリンダと、
前記シリンダと前記外筒との間に設けられ、作動液と気体とが封入された環状のリザーバ室と、
前記シリンダ内に摺動可能に設けられ、該シリンダ内を第1シリンダ室と第2シリンダ室との2室に区画するピストンと、
一端に前記ピストンが設けられ、他端側が前記シリンダの外部へ突出したピストンロッドと、
前記外筒の外側面に設けられ、内部が中空に形成されたバルブブロックと、
前記バルブブロック内を第1バルブブロック室と第2バルブブロック室との2つの液室に区画し、前記ピストンの移動により生じる作動液の流れを制御して減衰力を発生させる減衰力可変機構と、
前記第1シリンダ室と前記第1バルブブロック室とを連通する第1連通路と、
前記第2シリンダ室と前記第2バルブブロック室とを連通する第2連通路と、
前記バルブブロックの外側面と前記第1バルブブロック室又は前記第2バルブブロック室とを連通する第3連通路と、
前記第3連通路に設けられ、前記バルブブロックの外側面から前記第1バルブブロック室への作動液の流れを許容する第1逆止弁と、
前記第3連通路に設けられ、前記バルブブロックの外側面から前記第2バルブブロック室への作動液の流れを許容する第2逆止弁と、を備え、
前記緩衝器の製造方法は、
前記外筒に前記シリンダと前記バルブブロックとを組み付ける工程と、
前記バルブブロックに前記減衰力可変機構を組み付ける工程と、
前記第3連通路から前記バルブブロック内に作動液を注入する工程と、を有することを特徴とする緩衝器の製造方法。
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JP2002081481A (ja) * | 2000-09-04 | 2002-03-22 | Kayaba Ind Co Ltd | 低圧ガス入り油圧緩衝器の製造方法 |
WO2018216716A1 (ja) | 2017-05-26 | 2018-11-29 | 日立オートモティブシステムズ株式会社 | 緩衝器 |
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WO2020217602A1 (ja) * | 2019-04-24 | 2020-10-29 | 日立オートモティブシステムズ株式会社 | シリンダ装置の製造方法 |
JP2021088437A (ja) | 2019-12-03 | 2021-06-10 | 東芝エレベータ株式会社 | エレベータの段差報知装置 |
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US5458219A (en) * | 1984-02-07 | 1995-10-17 | Anderson; Richard D. | Pressurized shock absorber |
JPS6194639U (ja) * | 1984-11-29 | 1986-06-18 | ||
JP2002081481A (ja) * | 2000-09-04 | 2002-03-22 | Kayaba Ind Co Ltd | 低圧ガス入り油圧緩衝器の製造方法 |
WO2018216716A1 (ja) | 2017-05-26 | 2018-11-29 | 日立オートモティブシステムズ株式会社 | 緩衝器 |
WO2019230549A1 (ja) * | 2018-05-29 | 2019-12-05 | 日立オートモティブシステムズ株式会社 | 流体圧緩衝器の製造方法およびその注液装置 |
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JP2021088437A (ja) | 2019-12-03 | 2021-06-10 | 東芝エレベータ株式会社 | エレベータの段差報知装置 |
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