WO2022210239A1 - Structure de tuyau - Google Patents

Structure de tuyau Download PDF

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Publication number
WO2022210239A1
WO2022210239A1 PCT/JP2022/013861 JP2022013861W WO2022210239A1 WO 2022210239 A1 WO2022210239 A1 WO 2022210239A1 JP 2022013861 W JP2022013861 W JP 2022013861W WO 2022210239 A1 WO2022210239 A1 WO 2022210239A1
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WO
WIPO (PCT)
Prior art keywords
pipe
boss portion
peripheral surface
tip
bulge
Prior art date
Application number
PCT/JP2022/013861
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English (en)
Japanese (ja)
Inventor
靖人 富永
Original Assignee
いすゞ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2022210239A1 publication Critical patent/WO2022210239A1/fr

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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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially

Definitions

  • the present disclosure relates to a piping structure, and more particularly, to a piping structure including piping and a boss for assembling the piping.
  • the pipes arranged along the wall surface of the engine are fixed by inserting screws such as bolts into the bosses (also called welding nuts) that are connected to the top and bottom of the pipes. If the boss is separated from the pipe in order to maintain the shape of the pipe, the boss may interfere with other parts. However, considering the fastening operation using screws such as bolts, the distance between the outer peripheral surface of the pipe and the outer peripheral surface of the boss portion cannot be increased.
  • An object of the present disclosure is to provide a piping structure that prevents fluid from accumulating inside while avoiding interference with surrounding parts.
  • a piping structure that achieves the above object includes a pipe arranged along a wall surface, and a pipe arranged below the pipe and protruding from the wall surface in a direction intersecting with the axial direction of the pipe. and a boss into which a screw is inserted from the tip thereof, wherein a portion of the lower part of the pipe located immediately above the tip of the boss and the tip of the pipe are integrated and overlapped,
  • the protrusion length from the wall surface to the tip of the boss portion is such that the tip exceeds the lowest point on the inner peripheral surface of the pipe located directly above the boss portion and is farthest apart from the lowest point in the orthogonal direction.
  • the lower part of the pipe is a weir part having a convex bulge from the outer side to the inner side in the pipe radial direction with the lowest point as a boundary. and a roundabout portion in which the pipe wall forms a convex arc from the inner side to the outer side in the pipe radial direction.
  • the piping and the boss portion are integrated and overlapped, so that the piping and the boss portion are close to each other, and interference with peripheral components can be avoided. Furthermore, according to one aspect of the present disclosure, a portion where the shape of the pipe is changed and a portion where the shape of the pipe is not changed due to the close proximity of the pipe and the boss exist on the boundary of the lowest point of the pipe. Therefore, since the fluid that tries to stay in the part whose shape has been changed flows into the part that has not been changed, it is possible to avoid the fluid from accumulating inside the pipe.
  • FIG. 1 is a perspective view illustrating the piping structure of the embodiment.
  • FIG. 2 is an enlarged cross-sectional view of the hatched cross section in FIG. 3 is a cross-sectional view of the bulge in FIG. 1 in the XZ plane.
  • the X direction is the pipe axis direction of the pipe 11
  • the Y direction is the direction perpendicular to the pipe axis direction of the pipe 11
  • the axial direction of each of the bosses 12 to 14 and the bolt 15 and the Z direction is the vertical direction. respectively.
  • the white arrows in the figure indicate the flow of the recirculated exhaust.
  • the dimensions of the members are changed so that the configuration is easy to understand, and they do not necessarily match those actually manufactured.
  • screw refers to a male screw having a helical groove on the side surface of a cylindrical body.
  • bolts 15 are employed as screws.
  • the holes of the bosses 12 to 14 into which the screws are inserted are formed with spiral grooves directly on the cylindrical surface and have female threads to be screwed with the male threads, unless otherwise specified.
  • a nut having an opening formed with an internal thread that engages with the external thread is shown fitted in the central portion.
  • the piping structure 10 of the embodiment is assembled to the side of the engine by screwing bolts 15 onto bosses 12 to 14 of a piping 11 that constitutes part of an exhaust gas recirculation passage of an engine (not shown). It is.
  • the exhaust gas recirculation passage is a passage for recirculating exhaust gas from an exhaust passage (not shown) to the intake passage.
  • the recirculated exhaust gas flowing through the exhaust gas recirculation passage passes through the communication pipe 1 branched from the exhaust passage (not shown) and the flow rate control valve 2 and flows through the curved pipe 16 and the pipe 11 in this order.
  • the communication pipe 1 slopes downward toward the flow control valve 2 .
  • the flow control valve 2 is configured with a butterfly valve (not shown).
  • the piping structure 10 comprises a piping 11, bosses 12-14, a bent piping 16, and a flange 17.
  • the pipe 11 is composed of a circular pipe extending in the X direction, and its tip communicates with a curved pipe 16 indicated by a dotted line in the drawing.
  • Bosses 12-14 protrude from flange 17 in the Y direction.
  • the boss portions 12 to 14 form a cylindrical cylindrical body when viewed in the X direction.
  • a bolt 15 is inserted from the tip of each of the bosses 12 to 14 .
  • Bosses 12 to 14 surround the tip of bent pipe 16 .
  • the boss portion 12 is arranged directly below the pipe 11, the boss portion 13 is arranged directly above the pipe 11, and the boss portion 14 is arranged elsewhere.
  • the flange 17 has a plate-like shape projecting radially from the entire periphery of the tip of the curved pipe 16 .
  • the wall surface is the surface with which the outer peripheral surface of the pipe 11 is in contact, and indicates the surface from which the boss portions 12 to 14 protrude.
  • the wall surface is the surface facing the front side of the flange 17 in the Y direction.
  • a dam portion 21 having 20 formed thereon and a detour portion 22 are arranged side by side.
  • the lower part of the pipe 11 indicates the lower part in the Z direction of the pipe 11, and the tip part of the boss part 12 indicates the left part in the Y direction including the tip 12a.
  • the part of the lower portion of the pipe 11 is a portion located directly above the tip of the boss portion 12 .
  • integration indicates a state in which each member is seamlessly connected.
  • the piping structure 10 of this embodiment is constructed by integrating the piping 11, the boss portions 12 to 14, the bent piping 16, and the flange 17, respectively.
  • a portion of the lower portion of the pipe 11 and the tip portion of the boss portion 12 are integrated and overlapped means that the minimum value D1 of the thickness in the pipe radial direction of the integrated and overlapped portion is affected by the integration. It shows a state in which the thickness D2 of the pipe 11 and the ring width D3 of the boss portion 12 are smaller than the sum of the thickness D2 of the pipe 11 and the ring width D3 of the boss portion 12.
  • the integrally overlapped portion becomes a shared portion of the pipe 11 and the boss portion 12, and has an inner peripheral surface of the pipe 11, a tip 12a of the boss portion 12, and a portion into which the bolt 15 of the boss portion 12 is inserted. .
  • the minimum value D1 can be reduced to the larger value of the pipe thickness D2 and the ring width D3.
  • the ring width D3 is adopted as the minimum value D1.
  • the lowest point 18 is a point that indicates the lowest portion on the inner peripheral surface of the pipe 11 directly above the boss portion 12 in a cross-sectional view on the YZ plane.
  • the lowest point 18 is a point that indicates the lowest position when the engine with the piping structure 10 is mounted on the vehicle.
  • the most lateral point 19 is a point that indicates a portion located farthest in the Y direction from the lowest point 18 on the inner peripheral surface of the pipe 11 directly above the boss portion 12 in a cross-sectional view on the YZ plane, and is located on the leftmost side in the drawing. It is a point that indicates the site where it is located.
  • the bulge 20 is formed by the pipe wall of the pipe 11 protruding from the outside in the pipe radial direction to the inside.
  • the pipe wall of the pipe 11 on which the bulge 20 is formed has a convex inner peripheral surface and a concave outer peripheral surface.
  • the inner peripheral surface of the pipe 11 on which the bulge 20 is formed has a shape obtained by rotating an ellipse whose long axis is directed in the X direction around the long axis and halving a spheroid by a plane passing through the long axis. form.
  • the bulge-formed outer peripheral surface forms a shape along the space so that the space forming a cylindrical body whose column axis direction is oriented in the X direction is held at the tip 12a of the boss portion 12 .
  • the bulge 20 has an apex 23, a first slope 24, an end 25 of the first slope 24, and a second slope 26 on its inner peripheral surface.
  • Bulge 20 has a flat surface 27 and a curved surface 28 on its outer peripheral surface.
  • the bulge 20 is formed by integrally overlapping the lower portion of the pipe 11 and the tip of the boss portion 12 with respect to the inner peripheral surface of other parts, and the protrusion length L1 of the boss portion 12 is such that the tip 12a is the lowest point 18 , and a length that does not exceed the most lateral point 19 of the pipe 11 .
  • the bulge 20 is formed by forming a depression 20 on the outer peripheral surface of the pipe 11 to secure a space for fastening the bolt 15 .
  • the projection length L1 is the length from the left side of the flange 17 in the Y direction to the tip 12a of the boss portion 12.
  • a position beyond the lowest point 18 is a position beyond a vertical line on the YZ plane passing through the lowest point 18 .
  • a position not exceeding the sidemost point 19 is a position not exceeding a vertical line on the YZ plane passing through the sidemost point 19 .
  • a vertex 23 indicates a portion of the inner peripheral surface of the bulge 20 that is located furthest inside the pipe 11 .
  • the first slope 24 is the inner peripheral surface of the pipe 11 on which the bulge 20 is formed, and is a surface that slopes downward from the vertex 23 toward the lowest point 18 side terminal 25 of the terminal ends of the bulge 20 .
  • the first slope 24 is a surface of a shape obtained by further cutting a halved spheroid along a plane passing through the major axis. As shown in the drawing, the first slope 24 is a surface that slopes downward from the vertex 23 toward the lowest point 18 in a cross section on the YZ plane passing through the vertex 23 .
  • a terminal end 25 of the first slope 24 is arranged before the lowest point 18 .
  • the first slope 24 is the inner peripheral surface of the pipe 11 on which the bulge 20 is formed, and is a slope formed by the inner peripheral surface protruding from the outer side to the inner side in the pipe radial direction.
  • the inner peripheral surface of another pipe 11 without the bulge 20 is a cylindrical surface formed by denting from the inner side to the outer side in the pipe radial direction.
  • a terminal end 25 of the first slope 24 is a boundary between a portion where the inner peripheral surface of the pipe 11 protrudes toward the inside and a portion where the inner peripheral surface is recessed toward the outside.
  • the second slope 26 is the inner peripheral surface of the pipe 11 on which the bulge 20 is formed. It is a surface that slopes downward from the opposite end to the vertex 23 .
  • the second slope 26 is a surface of a shape obtained by further cutting the halved spheroid by a plane passing through the major axis. As shown in the drawing, the second slope 26 is a surface that slopes downward toward the vertex 23 in a cross section on the YZ plane passing through the vertex 23 .
  • the weir portion 21 has a second slope 26 and a first slope 24 arranged in the pipe circumferential direction toward the lowest point 18 .
  • the weir portion 21 forms a slope that slopes downward toward the lowest point 18 over the entire inner peripheral surface.
  • the slope similarly slopes downward toward the lowest point 18 .
  • the flat surface 27 is the outer peripheral surface of the pipe 11 on which the bulge 20 is formed, and is a flat surface perpendicular to the X direction.
  • the flat surface 27 constitutes part of the tip 12 a of the boss portion 12 .
  • the flat surface 27 is a surface that comes into contact with the bearing surface 15 a of the bolt 15 when the bolt 15 is inserted into the boss portion 12 .
  • the curved surface 28 is the outer peripheral surface of the pipe 11 on which the bulge 20 is formed, and forms a convex cylindrical surface from the bottom to the top in the Z direction.
  • the curved surface 28 is a surface that does not protrude inside the space of the cylindrical body that is formed ahead of the tip 12a of the boss portion 12 . In other words, the curved surface 28 does not interfere with the bolt 15 that is inserted into and removed from the boss portion 12 .
  • the opening area of the pipe 11 in the section on the YZ plane where the bulge 20 is formed is equal to the opening area in the section on the YZ plane where the bulge 20 is not formed.
  • the opening on the right side of the vertical line passing through the lowest point 18 has a semicircular shape, and the area of the opening is equal to the area of the semicircle.
  • the opening shape on the left side of the drawing from the vertical line passing through the lowest point 18 has a bulge 20 formed, and the vicinity of the most lateral point 19 bulges from the inner side to the outer side in the pipe radial direction.
  • the opening area is equal to the opening area on the right side of the vertical line passing through the lowest point 18 in the figure.
  • the inner peripheral surface of the pipe 11 on which the bulge 20 is formed is streamlined in the X direction.
  • the streamlined shape indicates a shape in which the flow of fluid flowing in the X direction inside the pipe 11 is not blocked.
  • the inner peripheral surface on which the bulge 20 of the present embodiment is formed has the shape of a spheroid divided in half, and slopes downward from the vertex 23 toward the terminal end 29 of the bulge 20 .
  • the distance between the ends 29 of the bulge 20 on the XZ plane is longer than the diameter of the boss portion 12 , and the ends 29 are positioned outside the outer periphery of the boss portion 12 .
  • the lower portion of the pipe 11 and the tip portion of the boss portion 12 are integrated and overlapped, so that the pipe 11 and the boss portion 12 can be brought closer to each other. Therefore, interference with peripheral components can be avoided.
  • the weir portion 21 that changes the shape of the pipe 11 and the detour portion 22 that does not change the shape, which are generated by bringing the pipe 11 and the boss portion 12 close to each other are located at the bottom of the pipe 11. It exists with the point 18 as a boundary. Therefore, the fluid that tries to stay in the weir portion 21 flows into the detour portion 22 , so that it is possible to prevent the fluid from accumulating inside the pipe 11 .
  • Condensed water which is obtained by condensing water contained in the recirculated exhaust gas, flows toward the flow control valve 2 along the communication pipe 1 inclined downward, passes through the flow control valve 2, and flows into the bent pipe 16 and the pipe 11.
  • the condensed water that has passed through the curved pipe 16 flows into the lowest point 18 of the pipe 11 avoiding the bulge 20 without being hindered even if it collides with the tip of the bulge 20 of the pipe 11. ⁇ In this way, since it is possible to avoid accumulation of condensed water, corrosion of the inside of the pipe 11 due to condensed water can be suppressed.
  • the piping 11 and the boss portion 12 are brought close to each other, and the piping 11 has a shape close to that of a cylindrical pipe.
  • the target device can be installed in the middle of the piping.
  • the device intended for the shape of the cylindrical pipe is the flow control valve 2 with a built-in butterfly valve.
  • the protruding length L1 When the protruding length L1 is such that the tip 12a is arranged at a position not exceeding the lowest point 18, in order to secure a space for fastening the bolt 15, the lower part of the pipe 11 including the lowest point 18 is required. It is necessary to deform most of the inner peripheral surface upward. Therefore, the deformed portion acts as a weir against the upstream portion, and the condensed water flowing from the curved pipe 16 is accumulated. Further, when the protruding length L1 is such that the tip 12a is arranged at a position exceeding the sidemost point 19, the lengths of the bolt 15 and the boss portion 12 in the Y direction are extended. Therefore, the weight increases by the amount of extension. Further, the elongated boss portion becomes longer than the other boss portion 14 not integrated with the pipe 11, so that the common bolt 15 cannot be used for each of the boss portions 12 to 14. - ⁇
  • the protruding length L1 of the boss portion 12 is set to a length such that the tip 12a exceeds the lowest point 18 and does not exceed the most lateral point 19 .
  • the protruding length L1 of the boss portion 12 is set to a length such that the tip 12a exceeds the lowest point 18 and does not exceed the most lateral point 19 .
  • an increase in the weight of the piping structure 10 can be suppressed.
  • a common bolt 15 can be used for each boss 12-14.
  • the protruding length L1 is the length at which the tip 12a is arranged at a position on the lowest point 18 side of the vertical line passing through the midpoint between the vertical line passing through the lowest point 18 and the vertical line passing through the most lateral point 19. more preferred. As a result, the lengths of the bolt 15 and the boss portion 12 are shortened, which is advantageous for weight reduction.
  • the inner peripheral surface of the pipe 11 on which the bulge 20 is formed preferably has a first slope 24 that slopes downward from the vertex 23 of the bulge 20 toward the terminal end 25 on the lowest point 18 side.
  • the terminal end 25 of the first slope 24 on the side of the lowest point 18 be positioned before the lowest point 18 .
  • the inner peripheral surface of the pipe 11 from the terminal end 25 to the lowest point 18 extends from the inner side to the outer side in the pipe radial direction similarly to the detour portion 22 . becomes a convex cylindrical surface.
  • the terminal end 25 is positioned at the lowest point 18 , the condensed water that has flowed into the pipe 11 may be blocked by the weir section 21 and may not flow into the detour section 22 . Therefore, by positioning the terminal end 25 before the lowest point 18 , it is possible to reliably flow the condensed water to the detour portion 22 . Since the terminal end 25 is positioned in front of the lowest point 18 on the YZ plane passing through the vertex 23 , the terminal ends 25 before and after the X direction are positioned further in front of the lowest point 18 .
  • the weir portion 21 has a slope that slopes downward toward the lowest point 18 over the entire inner peripheral surface of the pipe 11 . As a result, even if the condensed water collides vigorously with the tip of the bulge 20 and rides on the bulge 20, the condensed water that rides on the bulge 20 flows toward the lowest point 18 due to the slope. As a result, a state in which condensed water accumulates in the weir portion 21 can be avoided.
  • the inner peripheral surface of the pipe 11 on which the bulge 20 is formed is preferably streamlined in the X direction.
  • the streamlined shape of the inwardly protruding portion allows the condensed water to flow smoothly and reduces resistance to the recirculated exhaust gas.
  • the piping structure 10 of the present disclosure is not limited to a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present disclosure.
  • the piping structure 10 of the present disclosure is not limited to piping in which the piping 11 constitutes a part of the exhaust gas recirculation passage, but can be applied to piping through which a fluid that causes corrosion of the inside of the piping 11 flows.
  • an exhaust manifold is exemplified as such piping.
  • the piping structure 10 is not limited to being mounted on an engine, and can be applied to other engines such as a boiler as long as the boss portion for attaching the piping to the wall surface is positioned below the piping. .
  • the piping structure 10 is configured with a pipe 11 and a boss portion 12 arranged below this pipe 11, other boss portions 13, 14, bent pipe 16, and flange 17 exemplified in the embodiment can be used. is not necessarily required.
  • the shape of the outer circumference is not particularly limited.
  • the axial direction of the bolt 15 inserted into and removed from the boss portion 12 is not limited to the direction perpendicular to the pipe axis direction of the pipe 11, and any direction that intersects the pipe axis direction can be applied.
  • the protrusion length of the boss portion 13 is the same as that of the boss portion 12 .
  • the upper part of the piping 11 has a portion where the pipe wall protrudes from the outer side to the inner side in the pipe radial direction and the pipe wall protrudes from the inner side to the outer side in the pipe radial direction. , and the arc-shaped portion of .
  • the boss portion 13 arranged above the pipe 11 is also brought close to the pipe 11 like the boss portion 12 .
  • the bulge formed by integrating and overlapping the pipe 11 and the boss portion 13 does not accumulate condensed water, so the shape is not particularly limited.
  • the shape of the bulge 20 is limited to the shape of the embodiment as long as the tip disposed on the upstream side with respect to the flow of the fluid flowing through the pipe 11 does not block the fluid and the shape facilitates removal of the casting core. not something.
  • the shape of the bulge 20 is a semi-cylindrical shape in which the column axis direction is directed to the pipe axis direction, and the semicircular tip surface is inclined toward the lowest point 18 when viewed from the inside to the outside in the pipe radial direction. are exemplified.
  • the end of the bulge 20 does not collide with the fluid, and the shape of that portion is not particularly limited.
  • the inner peripheral surface of the pipe 11 on which the bulge 20 is formed is desirably formed with a curved surface, but it does not have to be formed with a curved surface as long as the above conditions are satisfied.
  • the piping structure according to the present disclosure prevents fluid from accumulating inside while avoiding interference with surrounding components.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Une structure de tuyau 10 comprend un tuyau 11 et une partie de bossage 12 dans laquelle un boulon 15 est inséré. Le tuyau 11 et la partie bossage 12 sont disposés sous la forme d'un corps avec un chevauchement entre une partie distale de la partie bossage 12 et une partie d'une partie inférieure du tuyau 11 positionnée immédiatement au-dessus de la partie distale. Une longueur saillante L1 de la partie de bossage 12 correspond à une longueur telle qu'une extrémité distale 12a est située à une position au-delà d'un point le plus bas 18 et avant un point le plus latéral 19 dans la surface périphérique interne du tuyau 11. La partie inférieure du tuyau 11 est structurée de telle sorte qu'une partie de déversoir 21 dans laquelle une paroi de tuyau a un renflement 20 faisant saillie de l'extérieur vers l'intérieur dans la direction radiale du tuyau et une partie de dérivation 22 dans laquelle la paroi de tuyau forme une forme d'arc faisant saillie de l'intérieur vers l'extérieur dans la direction radiale du tuyau sont disposées côte à côte à travers le point le plus bas 18.
PCT/JP2022/013861 2021-03-29 2022-03-24 Structure de tuyau WO2022210239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021055577A JP7416000B2 (ja) 2021-03-29 2021-03-29 配管構造
JP2021-055577 2021-03-29

Publications (1)

Publication Number Publication Date
WO2022210239A1 true WO2022210239A1 (fr) 2022-10-06

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PCT/JP2022/013861 WO2022210239A1 (fr) 2021-03-29 2022-03-24 Structure de tuyau

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JP (1) JP7416000B2 (fr)
WO (1) WO2022210239A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3005104U (ja) * 1994-06-09 1994-12-13 川崎重工業株式会社 小型エンジンのマフラ
JP2001304058A (ja) * 2000-04-28 2001-10-31 Aichi Mach Ind Co Ltd インテークマニホールド
US20090064959A1 (en) * 2007-09-07 2009-03-12 Advanced Flow Engineering, Inc. Air intake manifold for coupling the output of a compressor to the air intake of an internal combustion engine
CN201297222Y (zh) * 2009-03-17 2009-08-26 沈阳新光华旭铸造有限公司 一种进气歧管
JP2011144768A (ja) * 2010-01-15 2011-07-28 Maruyasu Industries Co Ltd 直噴エンジン用高圧燃料デリバリパイプ及びその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3005104U (ja) * 1994-06-09 1994-12-13 川崎重工業株式会社 小型エンジンのマフラ
JP2001304058A (ja) * 2000-04-28 2001-10-31 Aichi Mach Ind Co Ltd インテークマニホールド
US20090064959A1 (en) * 2007-09-07 2009-03-12 Advanced Flow Engineering, Inc. Air intake manifold for coupling the output of a compressor to the air intake of an internal combustion engine
CN201297222Y (zh) * 2009-03-17 2009-08-26 沈阳新光华旭铸造有限公司 一种进气歧管
JP2011144768A (ja) * 2010-01-15 2011-07-28 Maruyasu Industries Co Ltd 直噴エンジン用高圧燃料デリバリパイプ及びその製造方法

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JP2022152711A (ja) 2022-10-12
JP7416000B2 (ja) 2024-01-17

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