KR20100015052A - Mounting structure of fuel pump in gasoline direct injection engine - Google Patents

Mounting structure of fuel pump in gasoline direct injection engine Download PDF

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Publication number
KR20100015052A
KR20100015052A KR1020080075939A KR20080075939A KR20100015052A KR 20100015052 A KR20100015052 A KR 20100015052A KR 1020080075939 A KR1020080075939 A KR 1020080075939A KR 20080075939 A KR20080075939 A KR 20080075939A KR 20100015052 A KR20100015052 A KR 20100015052A
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South Korea
Prior art keywords
fuel pump
mounting
cylinder head
head cover
direct injection
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KR1020080075939A
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Korean (ko)
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KR100999279B1 (en
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김재춘
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현대자동차주식회사
기아자동차주식회사
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Priority to KR1020080075939A priority Critical patent/KR100999279B1/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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/03—Reducing weight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/05—Reducing production costs, e.g. by redesign

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE: A mounting structure of a fuel pump in a gasoline direct injection engine is provided to keep the airtight seal even in case of thermal deformation of a cylinder head cover by inserting a seal ring in an assembly groove formed on the fuel pump. CONSTITUTION: A mounting structure of a fuel pump(12) in a gasoline direct injection engine includes a mounting boss with an assembly hole which is integrally formed in a cylinder head cover. The fuel pump is inserted in the assembly hole and fastened to the cylinder head cover by being settled on the mounting boss through a mounting flange(12a). The fuel pump has a radial assembly groove on the exterior inserted to the assembly hole. A seal ring is inserted in the assembly groove in order to keep the airtight seal between the fuel pump and the mounting boss.

Description

가솔린직접분사 엔진의 연료펌프 장착구조{Mounting structure of fuel pump in gasoline direct injection engine}Mounting structure of fuel pump in gasoline direct injection engine}

본 발명은 가솔린직접분사 엔진에 관한 것으로, 특히 가솔린직접분사 엔진의 실린더 헤드커버에 연료펌프를 별도의 마운팅브라켓을 사용하지 않고 직접 장착한 가솔린직접분사 엔진의 연료펌프 장착구조에 관한 것이다.The present invention relates to a gasoline direct injection engine, and more particularly, to a fuel pump mounting structure of a gasoline direct injection engine in which a fuel pump is directly attached to a cylinder head cover of a gasoline direct injection engine without using a separate mounting bracket.

현재 한층 심화되고 있는 지구 환경 문제로 유해 배출 가스가 적고 연비가 좋은 희박연소엔진(린번(lean-burn)엔진)에서부터 더 나아가 더 적극적인 연비 저감이나 냉 시동시 배기가스 저감기술로서 가솔린 연료를 실린더 내에 직접 분사하는 방식의 엔진이 개발되어 차량에 적용되고 있다.As a global environmental problem, the gasoline fuel is injected into the cylinder as a technology to reduce toxic emissions and improve fuel efficiency. Direct injection engines have been developed and applied to vehicles.

상기 가솔린직접분사(GDI; Gasoline Direct Injection)장치를 장착한 엔진은 실린더에 가솔린을 약 130bar 이하의 고압으로 직접 분사함으로써 보다 효과적이고 확실한 린번 엔진을 구현할 수 있는 데, 이때 짧은 시간에 공기와 연료의 혼합이 적정하게 이루어지도록 하는 유동, 분무 제어와 더불어 고압의 연료를 흡배기 밸브의 개폐시기에 맞추어 적절한 압력 값으로 설정하여 분사해주는 것이 특히 중요함은 물론이다.The engine equipped with the gasoline direct injection (GDI) device can implement a more effective and reliable lean burn engine by directly injecting gasoline into the cylinder at a high pressure of about 130 bar or less, wherein the air and fuel In addition to flow and spray control to ensure proper mixing, it is of particular importance to inject high-pressure fuel at an appropriate pressure value in accordance with the opening and closing time of the intake and exhaust valves.

또한 이와 같은 GDI 엔진은 부분 부하시에는 압축 행정 말기에 연료를 분사하여 점화 플러그 주위의 공연비를 농후하게 하는 성층 연소로 초희박 공연비(25∼40:1)에서도 쉽게 점화가 가능하도록 되어 있으며, 고부하시에는 흡입 행정 초기에 연료를 분사하여 이론 공연비(14.7:1) 연료에 의한 흡입 공기 냉각으로 충진 효율을 향상시킬 수 있는 한편, 실린더 안으로 연료를 직접 분사하므로 흡기포트 벽에 연료가 흡착되는 월 웨팅(wall wetting) 현상도 줄일 수 있는 장점이 있게 됨은 물론이다.In addition, such a GDI engine is a stratified combustion fuel that injects fuel at the end of the compression stroke at the end of the compression stroke to increase the air-fuel ratio around the spark plug, and thus it is possible to easily ignite even in the ultra-thin air-fuel ratio (25 to 40: 1). When the fuel is injected at the beginning of the intake stroke, the filling efficiency can be improved by cooling the intake air by the theoretical air-fuel ratio (14.7: 1) fuel, while the fuel is directly injected into the cylinder, so that the wall wetting that the fuel is adsorbed on the intake port wall. Of course, there is an advantage in reducing the (wall wetting) phenomenon.

그리고 GDI 엔진은 각 고유 값을 결정할 기준을 만들어 결정된 모드 값에 따른 연료 분사량, 연료분사시기, 점화시기, 공기 개도량 등을 결정하는 이론 공연비와 희박 운전영역 및 초희박 운전영역의 3가지 영역이 존재하고, 또한 연료 분사 압력이 조금만 변하더라도 분사되는 연료량에는 큰 변화가 발생하는 약 130bar 이하의 연료압이 요구되므로 통상적으로, 워밍업 후 이론 공연비 영역만 가지는 MPI 엔진에 비해 연료 분사계가 고압 연료 펌프 제어와 인젝터 드라이버 제어 및 연료분사압력 피드백 제어를 위해 복잡한 구성으로 이루어지게 된다.In addition, GDI engine sets the criteria to determine each unique value, and the three areas of theoretical air-fuel ratio, lean driving zone and ultra-lean driving zone which determine fuel injection amount, fuel injection timing, ignition timing, and air opening amount according to the determined mode value The fuel injection system is typically a high pressure fuel pump in comparison with an MPI engine having only a theoretical air-fuel ratio area after warming up because a fuel pressure of about 130 bar or less is required, and a large change occurs in the amount of fuel injected even if the fuel injection pressure is slightly changed. There are complex configurations for control, injector driver control and fuel injection pressure feedback control.

여기서 상기와 같이 복잡한 연료 분사계 중에 연료를 일정 값(130bar 이하)으로 가압하는 고압 연료펌프는 엔진의 후방 쪽에서 배기 쪽의 캠축에 강하게 고정ㅇ결합되어 고속 회전되고, 고압 연료펌프 본체는 실린더 헤드에 다수 군데에서 고정 볼트를 사용하여 장착된다.Here, the high pressure fuel pump for pressurizing the fuel to a predetermined value (130 bar or less) in the complex fuel injection system as described above is strongly fixed to the camshaft on the exhaust side from the rear side of the engine and rotates at high speed, and the high pressure fuel pump body is connected to the cylinder head. In many places it is mounted using fixing bolts.

도 1에는 종래 기술에 따라 가솔린직접분사 엔진의 실린더헤드 커버에 연료펌프가 장착된 상태의 사시도가 도시되어 있는 바, 즉 실린더헤드 커버(1)의 일측 모서리 부위에 조립홀을 가진 마운팅보스(1a)가 일체로 돌출해서 형성되고, 상기 마운팅보스(1a)에는 마운팅브라켓이 다수개의 체결볼트를 매개로 체결되어 장착되며, 상기 마운팅브라켓에 마운팅플랜지(3a)를 가진 연료펌프(3)가 조립되어서 상기 실린더헤드 커버에 장착되는 구조로 이루어진다.1 is a perspective view of a state in which a fuel pump is mounted on a cylinder head cover of a gasoline direct injection engine according to the prior art, that is, a mounting boss 1a having an assembly hole at one corner of the cylinder head cover 1. ) Is integrally formed to protrude, the mounting boss (1a) is mounted to the mounting bracket is fastened via a plurality of fastening bolts, the fuel pump (3) having a mounting flange (3a) to the mounting bracket is assembled It is made of a structure mounted to the cylinder head cover.

도 2에는 종래 기술에 따란 가솔린직접분사 엔진의 실린더헤드 커버에 연료펌프가 장착된 상태의 단면도가 도시되어 있는 바, 즉 상기 실린더헤드 커버(1)에 마운팅브라켓(2)을 매개로 연료펌프(3)가 장착된 상태에서 상기 실린더헤드 커버(1)와 마운팅브라켓(2) 사이의 기밀을 유지하기 위해 상기 실린더헤드 커버(1)의 내주면에는 조립홈이 상하 방향으로 형성됨과 더불어 상기 조립홈에 실링(4)이 삽입되어 있다.FIG. 2 is a cross-sectional view of a state in which a fuel pump is mounted on a cylinder head cover of a gasoline direct injection engine according to the prior art, that is, a fuel pump (for example, a mounting bracket 2 is connected to the cylinder head cover 1). 3) In order to maintain the airtight between the cylinder head cover (1) and the mounting bracket (2) in the mounting state, the inner groove of the cylinder head cover (1) is formed in the up and down direction as well as the assembly groove The seal 4 is inserted.

그런데 상기와 같은 종래의 가솔린직접분사 엔진의 연료펌프 장착구조에서는 별도의 마운팅브라켓을 사용함에 따라 차량의 중량 및 원가를 상승시키는 결점이 있었고, 상기 실린더헤드 커버가 엔진으로부터 지속적으로 열을 전달받아 변형될 경우에 상기 실링에 의한 기밀성이 악화되어 연료 혹은 가스의 누출이 발생된다고 하는 결점이 있었다.However, in the fuel pump mounting structure of the conventional gasoline direct injection engine as described above, there is a drawback of increasing the weight and cost of the vehicle by using a separate mounting bracket, and the cylinder head cover is deformed by continuously receiving heat from the engine. In this case, there is a drawback that the airtightness caused by the seal is deteriorated, and leakage of fuel or gas occurs.

이에 본 발명은 상기한 사정을 감안하여 안출된 것으로, 연료펌프를 실린더헤드 커버에 별도의 마운팅브라켓을 사용하지 않고 직접 장착하여 차량의 중량 및 원가 절감을 도모할 수 있고, 연료펌프와 실린더헤드 커버 사이의 기밀성도 향상시 켜 실린더헤드 커버의 열변형에 의한 연료 혹은 가스의 누출을 확실하게 방지할 수 있도록 한 가솔린직접분사 엔진의 연료펌프 장착구조를 제공함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above-described circumstances, and the fuel pump can be directly mounted to the cylinder head cover without using a separate mounting bracket, thereby reducing the weight and cost of the vehicle, and reducing the fuel pump and the cylinder head cover. It is an object of the present invention to provide a fuel pump mounting structure of a gasoline direct injection engine that improves the airtightness between the cylinder head cover and thus prevents leakage of fuel or gas due to thermal deformation of the cylinder head cover.

상기와 같은 목적을 달성하기 위한 본 발명은, 조립홀을 가진 마운팅보스가 실린더헤드 커버에 일체로 돌출해서 형성되고, 상기 조립홀에 연료펌프가 삽입되어서 상기 마운팅보스에 안착된 상태로 체결되어 장착된 구조로 이루어진다.The present invention for achieving the above object, the mounting boss having an assembly hole is formed to protrude integrally to the cylinder head cover, the fuel pump is inserted into the assembly hole is fastened and mounted in a state seated in the mounting boss Consists of a structure.

상기 연료펌프가 상기 조립홀에 삽입되는 소정 외주면에 반경방향으로 파여진 조립홈이 형성되고, 상기 연료펌프의 외주면과 상기 마운팅보스의 내주면 사이의 기밀을 유지하기 위는 실링이 상기 조립홈에 삽입되어 설치된 것을 특징으로 한다.An assembling groove is formed in a predetermined outer circumferential surface into which the fuel pump is inserted into the assembling hole, and an assembling groove is formed in a radial direction, and a seal is inserted into the assembling groove to maintain airtightness between the outer circumferential surface of the fuel pump and the inner circumferential surface of the mounting boss. Characterized in that the installation.

본 발명에 따른 가솔린직접분사 엔진의 연료펌프 장착구조에 의하면, 실린더헤드 커버에 조립홀을 가진 마운팅보스가 일체로 돌출해서 형성됨과 상기 마운팅보스의 조립홀에 연료펌프가 직접 삽입되어 안착된 상태로 다수개의 체결볼트에 의해직접 체결되어 장착됨으로써, 별도의 마운팅브라켓이 불필요해져 마운팅브라켓의 제작 및 장착에 의한 차량의 중량과 원가 절감을 도모할 수 있고, 상기 연료펌프의 소정 외주면에 내측으로 파여진 조립홈이 형성되면서 상기 조립홈에 실링이 삽입되어 설치됨에 따라 실린더헤드 커버가 열을 받아서 변형되어도 실링에 의한 기밀성의 저하가 방지되게 되는 등의 효과가 있다. According to the fuel pump mounting structure of the gasoline direct injection engine according to the present invention, a mounting boss having an assembling hole is integrally protruded from the cylinder head cover, and the fuel pump is directly inserted into the mounting hole of the mounting boss. By being fastened and mounted directly by a plurality of fastening bolts, a separate mounting bracket is unnecessary, so that the weight and cost of the vehicle can be reduced by manufacturing and mounting the mounting bracket, and the inner side of the fuel pump is cut inwardly. As the sealing groove is inserted into the assembly groove while the assembly groove is formed, the cylinder head cover may be deformed due to heat.

이하 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3에는 본 발명에 따라 가솔린직접분사 엔진의 연료펌프가 직접 장착되는 실린더헤드 커버의 평면도가 도시되어 있는 바, 즉 실린더헤드 커버(11)의 일측 모서리 부위에 조립홀(11a)을 가진 마운팅보스(11b)가 일체로 돌출해서 형성되어 있다.3 shows a plan view of a cylinder head cover in which a fuel pump of a gasoline direct injection engine is directly mounted according to the present invention, that is, a mounting boss having an assembly hole 11a at one corner of the cylinder head cover 11. 11b protrudes integrally and is formed.

상기 마운팅보스(11b)는 대체로 마름모 형상을 이루고, 양측 가장자리에는 2개의 볼트 체결홀(11c)이 형성되어 있다.The mounting boss 11b generally has a rhombus shape, and two bolt fastening holes 11c are formed at both edges thereof.

도 4에는 본 발명에 따라 가솔린직접분사 엔진의 연료펌프가 실린더헤드 커버에 직접 장착된 상태의 사시도가 도시되어 있는 바, 즉 연료펌프(12)에는 상기 마운팅보스(11b)에 대응하는 마름모 형상의 마운팅플랜지(12a)가 형성됨과 더불어 상기 마운팅플랜지(12a)에도 상기 마운팅보스의 볼트 체결홀(11c)에 대응하는 볼트 체결홀(12b)이 형성되어, 상기 연료펌프(12)가 마운팅보스(11b)의 조립홀(11a)을 통해 삽입되면 연료펌프의 마운팅플랜지(12a)가 상기 마운팅보스(11b)에 안착되고, 이 상태에서 마운팅플랜지와 마운팅보스에 각각 형성된 볼트 체결홀에 체결볼트를 삽입하여 조여 주면 연료펌프가 간단하게 실린더헤드 커버에 장착되는 것이다.4 is a perspective view showing a fuel pump of a gasoline direct injection engine directly mounted to a cylinder head cover according to the present invention, that is, the fuel pump 12 has a rhombus shape corresponding to the mounting boss 11b. In addition to the mounting flange 12a, a bolt fastening hole 12b corresponding to the bolt fastening hole 11c of the mounting boss is also formed in the mounting flange 12a, so that the fuel pump 12 is mounted boss 11b. When inserted through the assembly hole (11a) of the fuel pump mounting flange (12a) is seated on the mounting boss (11b), in this state by inserting the fastening bolt into the bolting holes formed in the mounting flange and the mounting boss respectively When tightened, the fuel pump is simply mounted on the cylinder head cover.

도 5에는 본 발명에 따라 가솔린직접분사 엔진의 연료펌프가 실린더헤드 커버에 직접 장착된 상태의 단면도가 도시되어 있는 바, 상기 연료펌프(12)가 상기 마운팅보스(11b)의 조립홀(11a)을 통해 삽입되는 소정 외주면에는 내측 방향으로 파여진 형태의 조립홈이 형성되고, 이 조립홈에 연료펌프의 외주면과 실린더헤더 커버의 마운팅보스의 내주면사이의 기밀을 유지하기 위해 실링(13)이 삽입되어 설 치된다.5 is a cross-sectional view of the fuel pump of the gasoline direct injection engine mounted directly to the cylinder head cover in accordance with the present invention, the fuel pump 12 is assembled hole (11a) of the mounting boss (11b) A predetermined groove is formed in a predetermined outer circumferential surface inserted through the inner groove, and a sealing 13 is inserted into the assembly groove to maintain the airtightness between the outer circumferential surface of the fuel pump and the inner circumferential surface of the mounting boss of the cylinder header cover. Will be installed.

물론 실린더헤드 커버의 마운팅보스의 내주면에 상기 조립홈을 형성하여 상기 실링(13)을 삽입해서 설치해도 동일한 효과를 얻을 수 있다.Of course, the same effect can be obtained by forming the assembly groove in the inner circumferential surface of the mounting boss of the cylinder head cover and inserting the seal 13.

상기와 같이 연료펌프의 외주면과 실린더헤드 커버의 마운팅보스의 내주면이 서로 접촉하는 부위에 직접 실링이 횡방향으로 설치됨에 따라 연료펌프와 실린더헤드 커버사이의 기밀성이 향상되어, 실린더헤드 커버가 열변형되어도 상기 실링에 의한 기밀성의 저하가 방지되게 된다.As the seal is directly installed in the transverse direction at the portion where the outer circumferential surface of the fuel pump and the inner circumferential surface of the mounting boss of the cylinder head cover come into contact with each other, the airtightness between the fuel pump and the cylinder head cover is improved, and the cylinder head cover is thermally deformed. Even if it is, the fall of the airtightness by the said sealing is prevented.

도 1은 종래 기술에 따라 가솔린직접분사 엔진의 실린더헤드 커버에 마운팅브라켓을 매개로 연료펌프가 장착된 상태의 사시도,1 is a perspective view of a state in which a fuel pump is mounted on a cylinder head cover of a gasoline direct injection engine through a mounting bracket according to the prior art;

도 2는 종래 기술에 따라 가솔린직접분사 엔진의 실린더헤드 커버에 마운팅브라켓을 매개로 연료펌프가 장착된 상태의 단면도,2 is a cross-sectional view of a fuel pump mounted on a cylinder head cover of a gasoline direct injection engine by a mounting bracket according to the prior art;

도 3은 본 발명에 따라 마운팅보스가 형성된 실린더헤드 커버의 사시도,3 is a perspective view of a cylinder head cover formed with a mounting boss according to the present invention;

도 4는 본 발명에 따라 가솔린직접분사 엔진의 실린더헤드 커버에 연료펌프가 직접 장착된 상태의 사시도,4 is a perspective view of a fuel pump directly mounted on a cylinder head cover of a gasoline direct injection engine according to the present invention;

도 5는 본 발명에 따라 가솔린직접분사 엔진의 실린더헤드 커버에 연료펌프가 직접 장착된 상태의 단면도이다.5 is a cross-sectional view of a fuel pump directly mounted on the cylinder head cover of the gasoline direct injection engine according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

11-실린더헤드 커버 12-연료펌프11-Cylinder Head Cover 12-Fuel Pump

13-실링13-seal

Claims (4)

조립홀을 가진 마운팅보스가 실린더헤드 커버에 일체로 돌출해서 형성되고, 상기 조립홀에 연료펌프가 삽입되어서 상기 마운팅보스에 안착된 상태로 체결되어 장착된 가솔린직접분사 엔진의 연료펌프 장착구조. A mounting boss having an assembling hole is formed to protrude integrally to the cylinder head cover, and a fuel pump mounting structure of a gasoline direct injection engine mounted in a state where the fuel pump is inserted into the assembling hole and seated in the mounting boss. 청구항 1에 있어서, 상기 연료펌프에는 상기 마운팅보스에 안착되는 마운팅플랜지가 형성된 것을 특징으로 하는 가솔린직접분사 엔진의 연료펌프 장착구조. The fuel pump mounting structure of claim 1, wherein the fuel pump has a mounting flange seated on the mounting boss. 청구항 2에 있어서, 상기 마운팅보스와 마운팅플랜지가 양측 모서리에 볼트 체결홀이 구비된 마름모 형상으로 형성된 것을 특징으로 하는 가솔린직접분사 엔진의 연료펌프 장착구조. The fuel pump mounting structure of claim 2, wherein the mounting boss and the mounting flange are formed in a rhombus shape having bolt fastening holes at both edges. 청구항 1에 있어서, 상기 연료펌프가 상기 조립홀에 삽입되는 소정 외주면에 반경방향으로 파여진 조립홈이 형성되고, 상기 연료펌프의 외주면과 상기 마운팅보스의 내주면 사이의 기밀을 유지하기 위는 실링이 상기 조립홈에 삽입되어 설치된 것을 특징으로 하는 가솔린직접분사 엔진의 연료펌프 장착구조.The method according to claim 1, wherein the assembly grooves are radially dug in the predetermined outer circumferential surface into which the fuel pump is inserted into the assembly hole is formed, the sealing to maintain the airtight between the outer circumferential surface of the fuel pump and the inner circumferential surface of the mounting boss A fuel pump mounting structure of a gasoline direct injection engine, characterized in that inserted into the assembly groove.
KR1020080075939A 2008-08-04 2008-08-04 Mounting structure of fuel pump in gasoline direct injection engine KR100999279B1 (en)

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