JP3748944B2 - Connection structure of branch connection in high-pressure fuel rail - Google Patents

Connection structure of branch connection in high-pressure fuel rail Download PDF

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Publication number
JP3748944B2
JP3748944B2 JP11959496A JP11959496A JP3748944B2 JP 3748944 B2 JP3748944 B2 JP 3748944B2 JP 11959496 A JP11959496 A JP 11959496A JP 11959496 A JP11959496 A JP 11959496A JP 3748944 B2 JP3748944 B2 JP 3748944B2
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Prior art keywords
branch
diameter
fuel rail
connection structure
connection
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JP11959496A
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JPH09280464A (en
Inventor
正佳 臼井
菊雄 浅田
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Usui Co Ltd
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Usui Co Ltd
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    • 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
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/02—Branch units, e.g. made in one piece, welded, riveted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、高圧燃料多岐管や高圧燃料ブロックのような燃料レールにおける分岐枝管もしくは分岐枝金具等による接続体の接続構造に係り、特にディーゼル内燃機関での１０００ｋｇｆ／ｃｍ２以上にも及ぶ高圧燃料を供給する高圧燃料レールにおける分岐接続体の接続構造に関するものである。
【０００２】
【従来の技術】
従来、この種の分岐接続体の接続構造としては例えば図４に示すように、内部を流通路１１−１とする燃料レールとしての本管１１の周壁部に設けた該流通路に通ずる貫孔１１−２を単に断面円孔となして該円孔部とに分岐接続体としての枝管１２側の管径そのままの接続端部１２−１を嵌挿した状態をもって相互に鑞着１３して接続構成していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の技術による接続構造にあっては、１０００ｋｇｆ／ｃｍ２以上にも及ぶ高圧流体の絶えず繰返される供給圧力の急激な変動と、特に機関からの加振及び雰囲気温度の上昇、下降による相手部材（相手座面) 同士の相対寸法変化に起因して、特に本管１１側の管径に比して比較的小径の分岐接続体の場合に、鑞着１３部附近での該分岐接続体側に鑞着時の局部過熱による機械的強度の劣化によって振動疲労に伴なう亀裂を生じ易く、しばしば燃料の漏れ等を招く可能性があった。
【０００４】
本発明は従来技術の有する前記問題に鑑みてなされたものであり、接続部での鑞着強度を強固となし、同時に分岐接続体側の接続部附近での疲労応力を効果的に軽減せしめ、配設状態下の繰返される高圧流体の供給圧力の急激な変動や加振及び温度変化に伴なう相対寸法変化等にあっても、分岐接続体側の接続部附近での亀裂を効果的に防止して燃料の漏れ等の生ずる憂いをなくすことのできる高圧燃料レールにおける分岐接続体の接続構造を提供しようとするものである。
【０００５】
【課題を解決するための手段】
本発明は上記目的を達成するため、燃料レール内にあって、内部の流通路に通ずる本管の軸方向にわたる周壁部に設けた少なくとも１つの個所での貫孔を、外方開口部をざぐりして断面凹形の座部を有する段付き孔となし、一方、分岐接続体側の端部附近を膨出させて前記座部に嵌合する断面円弧状壁または断面矩形状壁を有する拡径部となすとともに該拡径部に連なる先端部を前記段付き孔に嵌挿するストレート筒部となす接続頭部となして該頭部の前記拡径部を座部に当接係合せしめ、かつ相互の当接係合部を鑞着して接続構成したことを特徴とする高圧燃料レールにおける分岐接続体の接続構造を要旨とするものであり、さらに前記拡径部のなす直径（Ｄ）を、枝管もしくは枝金具の直径（ｄ）の約１．１倍乃至２倍となして形成したり、また前記拡径部の円弧状壁または断面矩形状壁のなす長さ（Ｌ）を直径（ｄ）の０．５乃至２．５倍となして形成したりするものである。
【０００６】
本発明は燃料レール側のなす前記座部と、分岐接続体側の拡径部付き接続頭部とが当接係合して相互に鑞着した接続構成となしたものであるから、接続部での鑞着強度を強固となすとともに拡径部の円弧状壁または断面矩形状壁によって分岐接続体側の接続部附近での疲労応力を効果的に軽減せしめることとなり、したがって繰返される高圧流体の供給圧力の急激な変動や加振或いは雰囲気温度の上昇、下降による相手部材同士の相対寸法変化等にあっても、分岐接続体側の接続部附近での亀裂を効果的に防止することができ、燃料の漏れ等の生ずる憂いをなくすこととなり、また燃料レール側の管径に比して概して小径となす分岐接続体にあっても有効となすことができるのである。
【０００７】
なお、この発明において、分岐接続体側の拡径部のなす直径（Ｄ）を、枝管もしくは枝金具の直径（ｄ）の約１．１倍乃至１．５倍となしたのは、耐振性、拡径加工および本管の管径等を考慮したもので、１．１倍未満では耐振性に乏しく、他方１．５倍を超えると拡径加工に無理を招いて困難となすとともに、燃料レールが本管の場合当該本管の強度低下をきたすためである。また、前記拡径部の円弧状壁または断面矩形状壁のなす長さ（Ｌ）を直径（ｄ）の０．５乃至２．５倍となしたのは、疲労応力の軽減効果を考慮したもので、０．５倍未満では分散機能に乏しく、他方２．５倍を超えると疲労応力軽減機能にほとんど影響を及ぼさず無意味となすからである。
【０００８】
【実施例】
以下、本発明の実施例を図面に基づいて説明すれば、図１は本発明の高圧燃料レールにおける分岐接続体の接続構造に係る枝管による接続部の一部切欠き断面図、図２は他の実施例の同上図１相当図、図３はさらに他の実施例を示す枝金具による接続部の一部切欠き断面図であって、１は燃料レールとしての本管、１−１は流通路、１−２は段付き孔、１−３は座部、２は分岐接続体としての枝管、２−１は接続頭部、２−１ａ、２−１ｂは拡径部、２−１ａ´は断面円弧状壁、２−１ｂ´は断面矩形状壁、２−１ｃ、２−１ｄはストレート筒部、４は鑞着、５は高圧燃料噴射管、６はナット、２２は分枝金具である。
【０００９】
本管１は内部を流通路１−１となして管径３０ｍ／ｍ程度以下の圧力配管炭素鋼管あるいはステンレス鋼管等の厚肉鋼管材からなるものである。そしてその該流通路１−１に通じて軸方向にわたる周壁部に単数もしくは間隔をおいた複数個所での貫孔を、外方開口部をざぐりして断面凹形の座部１−３を有する段付き孔１−２としている。
【００１０】
次に、分岐接続体としての枝管２、および他の実施例としての分岐接続体をなす分枝金具２２は、共に管径２０ｍ／ｍ程度以下の前記本管（１）と同種鋼管材もしくは鋼材からなるものであって、端部を膨出加工にて断面円弧状壁２−１ａ´または断面矩形状壁２−１ｂ´とした拡径部２−１ａ、２−１ｂとストレート筒部２−１ｃ２−１ｄとからなる接続頭部２−１の形状となし、該頭部の拡径部２−１ａ、２−１ｂを座部１−３に当接係合せしめた状態で相互の当接係合部を鑞着（４）して接続構成するものである。高圧燃料噴射管５は分枝金具２２の他端部にナット（６）によって配設されている。
【００１１】
かかる構成において、本発明では、前記拡径部２−１ａ、２−１ｂのなす直径（Ｄ）を耐振性、拡径加工度および本管１の管径等を考慮し、枝管２あるいは分枝金具２２の直径（ｄ）の約１．１倍乃至２倍とする。また、前記拡径部の断面円弧状壁２−１ａ´または断面矩形状壁２−１ｂ´のなす長さ（Ｌ）を鑞着強度、拡径加工度並びに疲労応力の軽減効果を考慮して、直径（ｄ）の０．５乃至２．５倍とする。
【００１２】
【発明の効果】
以上説明したように、本発明による高圧燃料レールにおける分岐接続体の接続構造は、燃料レール側としての本管に穿設された貫孔を段付き孔とし、この段付き孔の座部に枝管あるいは分枝金具側に形成した断面円弧状壁または断面矩形状壁を有する拡径部を当接係合せしめて相互に鑞着（４）した接続構造となしているので、接続部での鑞着強度を強固となすとともに拡径部の断面円弧状壁または断面矩形状壁によって分岐接続体側の接続部附近での疲労応力を効果的に軽減せしめる効果が得られ、従って配設下の繰返される高圧流体の供給圧力の急激な変動、加振及び雰囲気温度の上昇、下降による相手部材同士の相対寸法変化等にあっても、接続部附近での亀裂を効果的に防止して燃料の漏れ等の生ずる憂いをなすことができ、また燃料レール側の管径に比して概して小径となす分岐接続体にあっても有効となすことができ、さらにオーバーホール時に接続部からのゴミの侵入がない等、極めて有用な高圧燃料レールにおける分岐接続体の接続構造である。
【図面の簡単な説明】
【図１】本発明の実施例を示す高圧燃料レールにおける分岐接続体の接続構造に係る枝管による接続部の一部切欠き断面図である。
【図２】他の実施例の同上図１相当図である。
【図３】他の実施例を示す分枝金具による接続部の一部切欠き断面図である。
【図４】従来例を示す高圧燃料レールにおける分岐接続体の接続構造の一部切欠き断面図である。
【符号の説明】
１ 本管
１−１ 流通路
１−２ 段付き孔
１−３ 座部
２ 枝管
２−１ 接続頭部
２−１ａ、２−１ｂ 拡径部
２−１ａ´ 断面円弧状壁
２−１ｂ´ 断面矩形状壁
２−１ｃ、２−１ｄ ストレート筒部
４ 鑞着
５ 高圧燃料噴射管
６ ナット
２２ 分枝金具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure of a connecting body by a branch branch pipe or a branch branch metal fitting in a fuel rail such as a high pressure fuel manifold or a high pressure fuel block, and in particular, a high pressure exceeding 1000 kgf / cm 2 in a diesel internal combustion engine. The present invention relates to a connection structure of a branch connection body in a high-pressure fuel rail for supplying fuel.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4, for example, as shown in FIG. 4, a connecting structure for this type of branch connection body is a through-hole communicating with the flow passage provided in the peripheral wall portion of the main pipe 11 serving as a fuel rail having an internal flow passage 11-1. 11-2 is simply formed into a circular hole in cross section, and the connection end portion 12-1 having the same diameter as that of the branch pipe 12 as a branch connection body is fitted and attached to the circular hole portion. The connection was configured.
[0003]
[Problems to be solved by the invention]
However, in such a connection structure according to the prior art, a sudden change in the supply pressure of the high-pressure fluid constantly exceeding 1000 kgf / cm 2 , particularly an excitation from the engine and an increase in the ambient temperature, Due to the relative dimensional change between the mating members (the mating seat surfaces) due to the lowering, especially in the case of a branch connection body having a relatively small diameter compared to the pipe diameter on the main pipe 11 side, Cracks associated with vibration fatigue are likely to occur on the branch connector side due to deterioration of mechanical strength due to local overheating at the time of soldering, which may often lead to fuel leakage.
[0004]
The present invention has been made in view of the above-described problems of the prior art, and has a strong adhesion strength at the connection portion, and at the same time, effectively reduces the fatigue stress near the connection portion on the branch connection body side. Even in the case of sudden fluctuations in the supply pressure of repeated high-pressure fluid under installation conditions, relative dimensional changes due to vibration and temperature changes, etc., it is possible to effectively prevent cracks near the connection on the branch connection side. Therefore, it is an object of the present invention to provide a connection structure for a branch connection body in a high-pressure fuel rail that can eliminate the anxiety of fuel leakage.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention has a through-hole formed in a fuel rail, at least one portion provided in a peripheral wall portion extending in the axial direction of a main pipe that communicates with an internal flow passage, and an outer opening portion. And a stepped hole having a concave seat section, and on the other hand, an enlarged diameter having a cross-section arc-shaped wall or a rectangular cross-section wall that bulges near the end on the branch connector side and fits into the seat section. And a connecting head that forms a straight tube portion that fits into the stepped hole and a tip portion that is continuous with the enlarged diameter portion, and abuts and engages the enlarged diameter portion of the head with a seat portion, Further, the present invention is characterized in that the connecting structure of the branch connection body in the high-pressure fuel rail is formed by connecting the abutting engagement portions to each other, and further, the diameter (D) formed by the expanded diameter portion. Was formed to be about 1.1 to 2 times the diameter (d) of the branch pipe or branch fitting. And in which or formed without the 0.5 to 2.5 times the eggplant length of the arc-shaped wall or rectangular cross section wall of said radially enlarged portion (L) diameter (d).
[0006]
The present invention has a connection configuration in which the seat formed on the fuel rail side and the connection head portion with the enlarged diameter portion on the branch connector side are in contact and engaged with each other. In addition to strengthening the adhesion strength, the arcuate wall or the rectangular wall of the enlarged diameter part effectively reduces the fatigue stress near the connecting part on the branch connector side, and therefore the supply pressure of the high-pressure fluid that is repeated Even in the case of sudden fluctuations in vibration, vibration, or relative dimensional changes between mating members due to an increase or decrease in ambient temperature, it is possible to effectively prevent cracks in the vicinity of the connecting part on the branch connector side, It is possible to eliminate the anxiety of leakage and the like, and it is possible to make it effective even in a branch connection body having a smaller diameter than the pipe diameter on the fuel rail side.
[0007]
In the present invention, the diameter (D) formed by the enlarged diameter portion on the branch connector side is about 1.1 to 1.5 times the diameter (d) of the branch pipe or the branch metal fitting. In consideration of the diameter expansion processing and the main pipe diameter, etc., if it is less than 1.1 times, the vibration resistance is poor. On the other hand, if it exceeds 1.5 times, the diameter expansion processing becomes difficult and difficult. This is because when the rail is a main pipe, the strength of the main pipe decreases. In addition, the length (L) formed by the arc-shaped wall or the rectangular cross-sectional wall of the enlarged diameter portion is 0.5 to 2.5 times the diameter (d) in consideration of the effect of reducing fatigue stress. However, if it is less than 0.5 times, the dispersion function is poor, and if it exceeds 2.5 times, it has no effect on the fatigue stress reduction function and is meaningless.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway cross-sectional view of a connection portion by a branch pipe according to a connection structure of a branch connection body in a high-pressure fuel rail of the present invention. FIG. 3 is a partially cutaway cross-sectional view of a connecting portion by a branch bracket showing still another embodiment, wherein 1 is a main pipe as a fuel rail, Flow path, 1-2 is a stepped hole, 1-3 is a seat portion, 2 is a branch pipe as a branch connection body, 2-1 is a connection head, 2-1a, 2-1b is a diameter expansion portion, 2- 1a 'is a circular arc wall in section, 2-1b' is a rectangular wall in section, 2-1c, 2-1d is a straight cylindrical part, 4 is attached, 5 is a high pressure fuel injection pipe, 6 is a nut, 22 is a branch It is a metal fitting.
[0009]
The main pipe 1 is made of a thick-walled steel pipe material such as a pressure pipe carbon steel pipe or a stainless steel pipe having a pipe diameter of about 30 m / m or less with the flow passage 1-1 inside. And, through the flow passage 1-1, a peripheral wall portion extending in the axial direction is provided with a single or a plurality of spaced through holes, and a seat portion 1-3 having a concave cross section through the outer opening. It is set as the stepped hole 1-2.
[0010]
Next, the branch pipe 2 as a branch connection body and the branch fitting 22 as a branch connection body as another embodiment are both of the same steel pipe material as the main pipe (1) having a pipe diameter of about 20 m / m or less, or Expanded portions 2-1a, 2-1b and straight tube portion 2 which are made of steel and have end portions bulged into cross-sectional arc-shaped walls 2-1a 'or rectangular-shaped walls 2-1b'. -1c2-1d and the head portion 2-1a and 2-1b are in contact with and engaged with the seat portion 1-3. The contact engaging portion is attached (4) to be connected. The high-pressure fuel injection pipe 5 is disposed at the other end of the branch fitting 22 with a nut (6).
[0011]
In such a configuration, in the present invention, the diameter (D) formed by the expanded diameter portions 2-1a and 2-1b is determined in consideration of the vibration resistance, the expanded diameter degree, the diameter of the main pipe 1, and the like. The diameter (d) of the branch bracket 22 is about 1.1 to 2 times. In addition, the length (L) formed by the cross-section arc-shaped wall 2-1a ′ or the cross-section rectangular wall 2-1b ′ of the diameter-expanded portion is taken into consideration the effect of reducing the adhesion strength, the degree of diameter expansion, and the fatigue stress. , 0.5 to 2.5 times the diameter (d).
[0012]
【The invention's effect】
As described above, the connecting structure of the branch connector in the high-pressure fuel rail according to the present invention has a through hole formed in the main pipe as the fuel rail side as a stepped hole, and a branch is formed at the seat of the stepped hole. Since it has a connection structure in which the enlarged diameter portions having a cross-section arcuate wall or a rectangular cross-section wall formed on the pipe or branch metal fitting are abutted and engaged with each other (4), there is a connection structure. The effect of reducing the fatigue stress in the vicinity of the connecting part on the branch connector side is obtained by the arcuate wall or the rectangular cross-section wall of the enlarged diameter part, and the strength of the attachment is strengthened. Even if there is a sudden change in the supply pressure of the high-pressure fluid, vibration, rise in ambient temperature, or relative dimensional change between the mating members due to lowering, it is possible to effectively prevent cracks in the vicinity of the connection part and leak fuel etc. Can cause the anxiety Branch connection in a high-pressure fuel rail is extremely useful because it can be effective even with a branch connection body that is generally smaller in diameter than the tube diameter on the rail side, and there is no dust intrusion from the connection part during overhaul. It is a body connection structure.
[Brief description of the drawings]
FIG. 1 is a partially cutaway cross-sectional view of a connection portion by a branch pipe according to a connection structure of a branch connection body in a high-pressure fuel rail showing an embodiment of the present invention.
FIG. 2 is a view corresponding to FIG. 1 of another embodiment.
FIG. 3 is a partially cutaway cross-sectional view of a connecting portion using a branch metal fitting according to another embodiment.
FIG. 4 is a partially cutaway cross-sectional view of a connection structure of a branch connector in a high-pressure fuel rail showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main pipe 1-1 Flow path 1-2 Stepped hole 1-3 Seat part 2 Branch pipe 2-1 Connection head part 2-1a, 2-1b Expanded-diameter part 2-1a 'Cross-section circular arc wall 2-1b' Rectangle-shaped wall 2-1c, 2-1d Straight cylinder part 4 Clamping 5 High-pressure fuel injection pipe 6 Nut 22 Branch fitting

Claims (3)

燃料レール内にあって、内部の流通路に通ずる本管の軸方向にわたる周壁部に設けた少なくとも１つの個所での貫孔を、外方開口部をざぐりして断面凹形の座部を有する段付き孔となし、一方、分岐接続体側の端部附近を膨出させて前記座部に嵌合する断面円弧状壁または断面矩形状壁を有する拡径部となすとともに該拡径部に連なる先端部を前記段付き孔に嵌挿するストレート筒部となす接続頭部となして該頭部の前記拡径部を座部に当接係合せしめ、かつ相互の当接係合部を鑞着して接続構成したことを特徴とする高圧燃料レールにおける分岐接続体の接続構造。In the fuel rail, a through hole in at least one place provided in the peripheral wall portion extending in the axial direction of the main pipe that communicates with the internal flow passage is provided with a seat section having a concave cross section through the outer opening. There is no stepped hole, and on the other hand, the vicinity of the end on the branch connector side is bulged to form a diameter-enlarged part having a cross-section arcuate wall or a cross-section rectangular wall and to be connected to the diameter-enlarged part The distal end portion serves as a connecting head portion that forms a straight tube portion that is inserted into the stepped hole, and the enlarged-diameter portion of the head portion is brought into contact with and engaged with the seat portion. A connection structure of a branch connection body in a high-pressure fuel rail, characterized in that the connection structure is configured by wearing. 前記拡径部のなす直径（Ｄ）を、枝管もしくは枝金具の直径（ｄ）の約１．１倍乃至２倍となして形成したことを特徴とする請求項１記載の高圧燃料レールにおける分岐接続体の接続構造。The high-pressure fuel rail according to claim 1, wherein the diameter (D) formed by the enlarged diameter portion is formed to be about 1.1 to 2 times the diameter (d) of the branch pipe or the branch fitting. Branch connection structure. 前記拡径部の円弧状壁または断面矩形状壁のなす長さ（Ｌ）を直径（ｄ）の０．５乃至２．５倍となして形成したことを特徴とする請求項１記載の高圧燃料レールにおける分岐接続体の接続構造。2. The high pressure according to claim 1, wherein a length (L) formed by the arcuate wall or the rectangular wall of the enlarged diameter portion is 0.5 to 2.5 times the diameter (d). Connection structure of branch connection body in fuel rail.
JP11959496A 1996-04-17 1996-04-17 Connection structure of branch connection in high-pressure fuel rail Expired - Fee Related JP3748944B2 (en)

Priority Applications (1)

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JP11959496A JP3748944B2 (en) 1996-04-17 1996-04-17 Connection structure of branch connection in high-pressure fuel rail

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Application Number Priority Date Filing Date Title
JP11959496A JP3748944B2 (en) 1996-04-17 1996-04-17 Connection structure of branch connection in high-pressure fuel rail

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JPH09280464A JPH09280464A (en) 1997-10-31
JP3748944B2 true JP3748944B2 (en) 2006-02-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6929288B2 (en) 2001-12-20 2005-08-16 Usui Kokusai Sangyo Kaisha Limited Connecting structure of branch connector in fuel pressure accumulating container
JP4032383B2 (en) 2002-09-25 2008-01-16 臼井国際産業株式会社 FUEL RAIL, FUEL RAIL MAIN TUBE AND METHOD FOR PRODUCING THE SAME
KR200481756Y1 (en) * 2015-12-18 2016-11-07 최승준 Branched pipe assembly

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