KR20020084552A - Fuel pipe of diesel engine - Google Patents

Fuel pipe of diesel engine Download PDF

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Publication number
KR20020084552A
KR20020084552A KR1020010023920A KR20010023920A KR20020084552A KR 20020084552 A KR20020084552 A KR 20020084552A KR 1020010023920 A KR1020010023920 A KR 1020010023920A KR 20010023920 A KR20010023920 A KR 20010023920A KR 20020084552 A KR20020084552 A KR 20020084552A
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South Korea
Prior art keywords
fuel
connector
pipe
injector
distributor
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KR1020010023920A
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Korean (ko)
Inventor
신민규
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현대자동차주식회사
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Priority to KR1020010023920A priority Critical patent/KR20020084552A/en
Publication of KR20020084552A publication Critical patent/KR20020084552A/en

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    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/01—Arrangement of fuel conduits

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE: A sealing of rubber material is formed in outer circumference of a fuel pipe for closing with an inner circumference of a nut which connects a fuel pump with a fuel distributor and a fuel distributor with an injector. CONSTITUTION: An expansion portion is formed at both end of metal pipe for conveying fuel. The expansion portion is received in a connector to connect a fuel pump, a fuel distributor, and an injector. A sealing(14) of a rubber material is formed between seat portion(22) of the connector and a slanting surface(12) in outer circumference of the expansion portion. When connecting the connector to the fuel pump, fuel distributor, and injector, even though the center of the fuel pipe is put out of the center of the connector, the sealing of the rubber material absorbs the difference. Therefore, leakage of oil is prevented.

Description

디젤엔진의 고압연료파이프{Fuel pipe of diesel engine}Fuel pipe of diesel engine

본 발명은 디젤엔진의 고압연료파이프에 관한 것으로, 보다 상세하게는 고압의 연료를 분사하는 디젤엔진의 연료공급장치 중 연료펌프와 연료분배기, 연료분배기와 인젝터 간을 너트로써 연결하게 되는 연료파이프의 일단 외주연에 상기 너트 내주연과의 밀착을 위해서 고무재의 실링을 형성한 디젤엔진의 고압연료파이프에관한 것이다.The present invention relates to a high pressure fuel pipe of a diesel engine, and more particularly, to a fuel pipe connected between a fuel pump and a fuel distributor, a fuel distributor, and an injector in a fuel supply device of a diesel engine for injecting a high pressure fuel. It relates to a high-pressure fuel pipe of a diesel engine once formed on the outer circumferential edge to seal the rubber inner circumference.

일반적으로 디젤엔진은 실린더 내로 공기를 흡입하고 압축하면 500~550 ℃의 압축열이 발생하는데, 이때 고압의 연료를 인젝터 노즐을 통해 연소실에 분사하여 연료가 착화 및 연소되도록 하므로서 동력을 얻는 엔진이다.In general, a diesel engine generates 500 to 550 ° C. of compressed heat when air is sucked into and compressed into a cylinder. At this time, a high-pressure fuel is injected into the combustion chamber through an injector nozzle to ignite and burn the fuel, thereby obtaining power.

여기서, 상기와 같이 고온 고압의 연소실에 연료를 분사하는 디젤엔진의 연료공급 장치를 살펴보면, 도 3에 도시된 바와 같이 연료가 저장된 연료탱크(50)와, 상기 연료탱크(50)로부터 연료를 흡입하는 피이드펌프(51)와, 상기 피이드펌프(51)에서 제공되는 연료를 여과하는 연료필터(52)와, 여과된 연료에 압력을 가하는 인젝션펌프(53)와 인젝션펌프(53)에서 가압된 연료를 각 인젝터(54)로 분배하는 분배기(55) 등으로 구성되어 있다.Here, referring to the fuel supply device of the diesel engine for injecting fuel into the combustion chamber of the high temperature and high pressure as described above, as shown in FIG. 3, the fuel tank 50 stores the fuel and the fuel is sucked from the fuel tank 50. The feed pump 51, the fuel filter 52 for filtering the fuel provided by the feed pump 51, the injection pump 53 for applying pressure to the filtered fuel and the fuel pressurized by the injection pump 53 It is composed of a distributor 55 and the like to distribute the to each injector 54.

상기한 바와 같이 구성된 디젤엔진의 연료공급장치는 인젝션펌프로부터 전달된 동력으로 작동되는 피이드펌프(51)에서 연료탱크(50)의 연료를 흡입하여 연료필터(52)로 압송하여 여과하고, 여과된 연료는 인젝션펌프(53)에서 가압된 상태로 인젝터(54)를 통해 연소실에 분사하도록 한다.The fuel supply device of the diesel engine configured as described above sucks the fuel of the fuel tank 50 from the feed pump 51 operated by the power delivered from the injection pump, transports the fuel to the fuel filter 52, and filters the filtered fuel. The fuel is injected into the combustion chamber through the injector 54 while being pressurized by the injection pump 53.

그런데 최근의 디젤엔진(예를 들어, Common rail system)에서는 기존의 기계식 디젤엔진과는 다르게 상당한 고압(1,350Bar 이상)으로 연소실에 연료를 직접분사를 하므로서 연비 및 성능을 향상되고 있다. 따라서 연료의 고압분사에 따른 압력에 견디도록 하기 위해서 연료펌프와 분배기, 분배기와 인젝터 간에는 고압연료파이프가 연결된다. 상기한 고압연료파이프는 도 4에 도시되는 바와 같이 금속재의 파이프(60) 양쪽 끝단으로 뱀머리 형태의 확장부(61)가 형성되고, 상기 확장부(61)의 내측으로 연료펌프, 분배기, 인젝터 등의 연료 유출입구에 연결하기 위한 컨넥터(65)가 형성된다. 상기한 확장부(61)의 내측으로는 상기한 컨넥터(65)의 시트부(66)와 밀착되어 연료가 누유되지 않도록 하기 위해 일정각도 경사진 경사면 (62)이 형성된다.However, in recent diesel engines (for example, common rail system), unlike conventional mechanical diesel engines, fuel consumption and performance are improved by directly injecting fuel into the combustion chamber at a high pressure (1,350 bar or more). Therefore, the high pressure fuel pipe is connected between the fuel pump and the distributor, the distributor and the injector to withstand the pressure caused by the high pressure injection of the fuel. As shown in FIG. 4, the high-pressure fuel pipe has a snakehead-shaped expansion portion 61 formed at both ends of the metal pipe 60, and a fuel pump, a distributor, and an injector inside the expansion portion 61. A connector 65 is formed for connecting to the fuel outlet opening of the back. An inclined surface 62 inclined at an angle is formed inside the expansion part 61 so as to be in close contact with the seat portion 66 of the connector 65 and prevent fuel leakage.

그러나 상기와 같은 고압연료파이프는 고압의 연료를 이송하는 파이프의 품질에는 큰 문제는 없었으나, 엔진 조립과정에서 각 부품들의 공차가 누적됨에 따라서 파이프를 조립하였을 때, 파이프 중심과 너트의 중심이 약간씩 일치하지 않는 미스어라인먼트(Misalignment)가 발생되는 문제점이 있었다. 또한, 상기와 같이 고압연료파이프와 너트의 중심이 어긋나게 되면 누유가 발생되므로서 차량화재의 위험성이 있었다.However, the high pressure fuel pipe as described above did not have a big problem in the quality of the pipe for transporting the high pressure fuel. However, when the pipes were assembled according to the accumulated tolerances of the components in the engine assembly process, the center of the pipe and the nut were slightly different. There was a problem that misalignment occurs that is not very consistent. In addition, when the center of the high-pressure fuel pipe and the nut is shifted as described above, there is a risk of fire due to leakage of oil.

따라서 본 발명은 상기와 같은 문제점을 해결하기 위해서 안출된 것으로서, 보다 상세하게는 고압의 연료를 분사하는 디젤엔진의 연료공급장치 중 연료펌프와 연료분배기, 연료분배기와 인젝터 간을 너트로써 연결하게 되는 연료파이프의 일단 외주연에 상기 너트 내주연과의 밀착을 위해서 고무재의 실링을 형성한 디젤엔진의 고압연료파이프를 제공하는 데 있다.Accordingly, the present invention has been made to solve the above problems, and more specifically, the fuel pump and fuel distributor, fuel distributor and injector of the fuel supply device of the diesel engine for injecting high-pressure fuel is connected by a nut. The present invention provides a high-pressure fuel pipe of a diesel engine in which a rubber seal is formed on the outer circumference of a fuel pipe to closely contact the inner circumference of the nut.

본 발명은 상기한 목적을 달성하기 위한 수단으로서,The present invention as a means for achieving the above object,

연료를 이송시키기 위한 금속재의 파이프 양쪽 끝단에 뱀머리 모양의 확장부가 형성되고, 연료펌프, 연료분배기, 인젝터의 연료유입구에 연결하기 위한 컨넥터에 상기 확장부가 수용되는 고압연료파이프에 있어서,In the high-pressure fuel pipe in which a snake-like extension is formed at both ends of a metal pipe for transporting fuel, and the extension is accommodated in a connector for connecting to a fuel pump, a fuel distributor, and a fuel inlet of an injector.

상기한 확장부 외주연에 형성된 경사면과 컨넥터의 시트부 사이에 고무재의 실링을 추가로 형성하므로서, 상기한 컨넥터를 상기 연료펌프, 연료분배기, 인젝터 등의 연료 유출입구에 연결하는 경우에 연료파이프의 중심이 상기 콘넥터의 중심에서 어느 정도 어긋나더라도 서로 어긋난 이격을 상기 고무재의 실링에서 이를 흡수하게 되므로서 누유가 차단되는 것을 특징으로 한다.A rubber seal is further formed between the inclined surface formed on the outer periphery of the expansion portion and the seat portion of the connector, so that when the connector is connected to the fuel outlet of the fuel pump, fuel distributor, injector, etc. Even if the center is shifted to some extent from the center of the connector, the gaps shifted from each other are absorbed by the sealing of the rubber material, so that the oil leakage is blocked.

도 1은 본 발명에 의해 형성된 고압연료파이프의 단면도.1 is a cross-sectional view of a high pressure fuel pipe formed by the present invention.

도 2는 본 발명에 의해 형성된 고압연료파이프의 결합상태도.Figure 2 is a combined state of the high pressure fuel pipe formed by the present invention.

도 3은 일반적인 디젤엔진의 연료공급장치를 설명하기 위한 도면.3 is a view for explaining a fuel supply device of a general diesel engine.

도 4는 종래의 고압연료파이프의 구성도.4 is a configuration diagram of a conventional high pressure fuel pipe.

※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing

10 : 고압연료파이프 11 : 확장부10: high pressure fuel pipe 11: expansion portion

12 : 경사면 14 : 실링12: slope 14: sealing

20 : 컨넥터 21 : 삽입공20: connector 21: insertion hole

22 : 시트부 30 : 연료 유출입구22: seat portion 30: fuel outlet

이하, 본 발명의 실시예를 첨부한 도면과 함께 상세하게 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail.

도 1은 본 발명에 의해 형성된 고압연료파이프의 단면도이며, 도 2는 본 발명에 의해 형성된 고압연료파이프의 결합상태도이다.1 is a cross-sectional view of a high pressure fuel pipe formed by the present invention, Figure 2 is a state diagram of the high pressure fuel pipe formed by the present invention.

도면 중에 표시되는 도면부호 10은 본 발명에 의해 형성된 고압연료파이프를 지시하는 것이며, 도면부호 20은 컨넥터를 지시하는 것이며, 도면부호 30은 연료펌프, 연료분배기, 인젝터 등의 연료 유출입구를 지시하는 것이다.Reference numeral 10 denoted in the drawings indicates a high-pressure fuel pipe formed by the present invention, reference numeral 20 denotes a connector, reference numeral 30 denotes a fuel outlet, such as a fuel pump, a fuel distributor, an injector, and the like. will be.

상기한 고압연료파이프(10)의 양쪽 끝단에는 종래와 같이 뱀머리 형상으로 확장된 확장부(11)가 형성된다. 그런데 상기 확장부(11)의 외경이 상기 컨넥터(20)의 파이프 삽입공(21)의 내경보다 크게 형성되어야 하므로서, 미리 별도로 형성된 컨넥터(20)를 직관인 파이프의 일측에 방향을 맞추어 끼운 다음 단조에 의해 가공되는 것이다.Both ends of the high-pressure fuel pipe 10 is formed with an expansion portion 11 extended in the shape of a snake head as in the prior art. However, since the outer diameter of the expansion part 11 should be formed larger than the inner diameter of the pipe insertion hole 21 of the connector 20, the connector 20 formed in advance is fitted in one direction of the straight pipe and then forged. It is processed by.

특히, 상기 확장부(11)의 내측에는 일정각도 만큼 경사진 경사면(12)이 형성되는데, 이 경사면(12)은 상기 컨넥터(20) 내측에 형성된 시트부(22)와 같은 각도로 형성되어야 한다.In particular, an inclined surface 12 inclined by a predetermined angle is formed inside the expansion part 11, and the inclined surface 12 should be formed at the same angle as the seat part 22 formed inside the connector 20. .

그런 다음, 상기한 확장부(11)에 형성된 환형의 경사면(12)에는 고무재로 형성된 환형의 실링(14)이 부착되는데, 이 실링(14)의 단면은 직사각 형상을 이루는 것이 바람직하다.Then, an annular seal 14 formed of a rubber material is attached to the annular inclined surface 12 formed in the expansion part 11, and the cross section of the seal 14 preferably has a rectangular shape.

이상과 같이 형성된 고압연료파이프의 작용을 상세하게 설명하면 다음과 같다.Referring to the operation of the high-pressure fuel pipe formed as described above in detail.

상기한 컨넥터(20) 및 확장부(11)는 연료파이프(10)의 양쪽 끝단에 모두 형성되며, 엔진 조립시 연료펌프, 분배기, 인넥터 등에 형성된 연료 유출입구(30)에 각각 조립된다.The connector 20 and the expansion part 11 are formed at both ends of the fuel pipe 10, and are assembled at the fuel outlet inlets 30 formed at the fuel pump, the distributor, the connector, and the like, when assembling the engine.

엔진의 각각의 부품은 생산과정에서 약간의 공차를 가지게 되는데, 엔진 조립시 이러한 공차가 누적됨으로 인해서 상기한 고압연료파이프(10)를 조립하는 경우에도 상기 고압연료파이프(10)의 중심과 상기 컨넥터(20)의 중심이 약간씩 어긋나게 된다.Each part of the engine has a slight tolerance in the production process, and when assembling the high-pressure fuel pipe 10 due to the accumulation of these tolerances in the engine assembly, the center of the high-pressure fuel pipe 10 and the connector The center of (20) is slightly shifted.

이때, 본 발명에 의해 형성된 고압연료파이프(10)의 경우에는 그 확장부(11)에 고무재의 실링(14)이 형성되어, 상기 실링(14)이 컨넥터(20)의 시트부(22)와 밀착되므로서 어느정도의 이격을 흡수하게 되어 고압의 연료가 누출되는 현상이 미연에 방지된다.In this case, in the case of the high-pressure fuel pipe 10 formed by the present invention, a rubber seal 14 is formed in the expansion part 11, and the seal 14 is connected to the seat part 22 of the connector 20. The close contact absorbs a certain amount of separation, preventing the leakage of high pressure fuel.

따라서 고압으로 압축된 연료가 파이프를 통하여 손실없이 인젝터까지 공급되므로서 엔진의 연비 및 성능이 향상되고, 엔진에서 연료가 누유되는 것이 방지되므로서 엔진의 안전성이 향상된다.Therefore, the fuel compressed at high pressure is supplied to the injector without loss through the pipe, thereby improving the fuel economy and performance of the engine and improving the safety of the engine by preventing the fuel from leaking in the engine.

또한, 엔진 조립시 연료파이프의 자유도가 좋아져서 엔진의 조립성이 향상된다.In addition, the degree of freedom of the fuel pipe at the time of assembling the engine is improved, thereby improving the assemblability of the engine.

이상과 같이 구성되는 본 발명은 디젤엔진의 연료펌프, 분배기, 인젝터 등에 연결되어 연료를 이송하기 위한 연료파이프의 중심과 컨넥터의 중심이 제품의 공차 누적으로 인해 어느 정도 어긋나게 결합되더라도, 연료파이프의 경사면과 컨넥터의 시트부 사이에 형성된 고무재의 실링에 의해서 서로 중심이 어긋난 이격이 복구되므로서, 고압으로 압축된 연료가 파이프를 통하여 손실없이 인젝터까지 공급될 수 있으며, 연료파이프의 자유도가 좋아지므로서 엔진의 조립성이 향상되는 장점이 있는 것이다.The present invention configured as described above is connected to a fuel pump, a distributor, an injector, etc. of a diesel engine, even if the center of the fuel pipe and the center of the connector are coupled to some extent due to the tolerance accumulation of the product, the slope of the fuel pipe The separation of the centers from each other is restored by the sealing of the rubber material formed between the seat portion of the connector and the connector, so that the fuel compressed at high pressure can be supplied to the injector without loss through the pipe, and the freedom of the fuel pipe is improved. There is an advantage that the assembly is improved.

Claims (1)

연료를 이송시키기 위한 금속재의 파이프 양쪽 끝단에 뱀머리 모양의 확장부가 형성되고, 연료펌프, 연료분배기, 인젝터의 연료유입구에 연결하기 위한 컨넥터에 상기 확장부가 수용되는 고압연료파이프에 있어서,In the high-pressure fuel pipe in which a snake-like extension is formed at both ends of a metal pipe for transporting fuel, and the extension is accommodated in a connector for connecting to a fuel pump, a fuel distributor, and a fuel inlet of an injector. 상기한 확장부(11) 외주연에 형성된 경사면(12)과 컨넥터(20)의 시트부(22) 사이에 고무재의 실링(14)을 추가로 형성하므로서, 상기한 컨넥터(20)를 상기 연료펌프, 연료분배기, 인젝터 등의 연료 유출입구(30)에 연결하는 경우에 연료파이프 (10)의 중심이 상기 콘넥터(20)의 중심에서 어느 정도 어긋나더라도 서로 어긋난 이격을 상기 고무재의 실링(14)에서 이를 흡수하게 되므로서 누유가 차단되는 것을 특징으로 하는 디젤엔진의 고압연료파이프.By further forming a rubber seal 14 between the inclined surface 12 formed on the outer periphery of the expansion portion 11 and the seat portion 22 of the connector 20, the connector 20 is connected to the fuel pump. , When the center of the fuel pipe 10 is shifted to some extent from the center of the connector 20 when the fuel outlet 10 is connected to the fuel outlet inlet 30 such as a fuel distributor or an injector, the gaps deviated from each other may be separated from the seal 14 of the rubber material. High pressure fuel pipe of a diesel engine, characterized in that the oil leakage is blocked by absorbing this.
KR1020010023920A 2001-05-03 2001-05-03 Fuel pipe of diesel engine KR20020084552A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100707224B1 (en) * 2004-09-02 2007-04-17 우수이 고쿠사이 산교 가부시키가이샤 High pressure fuel injection tube and method of forming the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05296121A (en) * 1992-04-17 1993-11-09 Usui Internatl Ind Co Ltd High pressure diesel fuel injection pipe for diesel engine
JPH06241138A (en) * 1993-02-15 1994-08-30 Usui Internatl Ind Co Ltd Connection structure for high pressure fuel injecting pipe
JPH08246989A (en) * 1995-03-10 1996-09-24 Nissan Diesel Motor Co Ltd Holding device for fuel injection pipe for diesel engine
JPH08303322A (en) * 1995-04-28 1996-11-19 Mitsubishi Motors Corp Fuel injection pipe introduction device
JPH1068367A (en) * 1996-08-28 1998-03-10 Usui Internatl Ind Co Ltd Structure of connecting head of high pressure fuel injection pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05296121A (en) * 1992-04-17 1993-11-09 Usui Internatl Ind Co Ltd High pressure diesel fuel injection pipe for diesel engine
JPH06241138A (en) * 1993-02-15 1994-08-30 Usui Internatl Ind Co Ltd Connection structure for high pressure fuel injecting pipe
JPH08246989A (en) * 1995-03-10 1996-09-24 Nissan Diesel Motor Co Ltd Holding device for fuel injection pipe for diesel engine
JPH08303322A (en) * 1995-04-28 1996-11-19 Mitsubishi Motors Corp Fuel injection pipe introduction device
JPH1068367A (en) * 1996-08-28 1998-03-10 Usui Internatl Ind Co Ltd Structure of connecting head of high pressure fuel injection pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100707224B1 (en) * 2004-09-02 2007-04-17 우수이 고쿠사이 산교 가부시키가이샤 High pressure fuel injection tube and method of forming the same

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