KR20130130104A - High presure fuel pump for direct injection type gasoline engine - Google Patents

High presure fuel pump for direct injection type gasoline engine Download PDF

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Publication number
KR20130130104A
KR20130130104A KR1020110146490A KR20110146490A KR20130130104A KR 20130130104 A KR20130130104 A KR 20130130104A KR 1020110146490 A KR1020110146490 A KR 1020110146490A KR 20110146490 A KR20110146490 A KR 20110146490A KR 20130130104 A KR20130130104 A KR 20130130104A
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KR
South Korea
Prior art keywords
bracket
direct injection
fuel pump
seal carrier
gasoline engine
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KR1020110146490A
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Korean (ko)
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KR101349641B1 (en
Inventor
황재근
이연홍
김기태
강명권
유해찬
김경남
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(주)모토닉
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Priority to KR1020110146490A priority Critical patent/KR101349641B1/en
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Publication of KR101349641B1 publication Critical patent/KR101349641B1/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
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston

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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)

Abstract

High-pressure fuel pump for direct injection-type gasoline engines of the present invention comprises; a body wherein openings of an inlet side and a discharge side are formed on both sides of the side face with formation of a combining part mounted with a damper part on the upper part; and a damper part combined with the combining part of the body to reduce pulsating of inhaled fuel; and a spill valve combined with an opening on the inlet side to control supply flux and discharge pressure of fuel; and check valves combined with openings on the inlet side and the discharge side, respectively; and a bracket provided with a suction member combined with the lower part of the body to generate a suction force for the inhaled fuel ; wherein the bracket is formed with a flange part with formation of mounting holes on an outer face of the upper part and characterized by integrated formation of a partition wall supporting a return spring that causes reciprocating motion for the suction member and a seal carrier with installation of a seal member sealing the inside of the body. Hence, since execution of welding around the seal carrier is prevented as the seal carrier is formed in integration with the bracket combined to a body, the present invention has the effects that damages to the seal member accommodated in the seal carrier are prevented in a combining process of the seal carrier and that bracket durability is increased even if shocks are applied to the partition wall by the return spring as the bracket and the seal carrier are formed in integration,

Description

직접분사식 가솔린 엔진용 고압연료펌프 { High presure fuel pump for direct injection type gasoline engine }High presure fuel pump for direct injection type gasoline engine}

본 발명은 직접분사식 가솔린 엔진용 고압연료펌프에 관한 것으로서, 더욱 상세하게는 바디와 씰 캐리어가 결합될 때 씰 부재가 손상되는 것을 방지하고, 씰 캐리어의 내구성을 증대시키기 위하여 씰 캐리어가 바디에 결합되는 브래킷과 일체형으로 형성된 직접 분사식 가솔린 엔진용 고압연료펌프에 관한 것이다.
The present invention relates to a high-pressure fuel pump for a direct injection gasoline engine, and more particularly, the seal carrier is coupled to the body to prevent damage to the seal member when the body and the seal carrier are combined, and to increase the durability of the seal carrier. It relates to a high-pressure fuel pump for a direct injection gasoline engine formed integrally with the bracket.

가솔린 엔진의 연비 및 성능을 개선하기 위하여 직접 분사식 엔진(GDI:Gasoline direct injection) 기술이 개발되고 있다. 공기/연료 혼합기(air/fuel mixture)의 흡입/압축/점화/폭발/배기 과정에 의해 동력을 발생하는 통상의 가솔린 엔진의 연소 과정에 비하여 직접분사식 가솔린 엔진은 공기만을 흡입하여 압축한 후 연료를 분사하게 된다. 이러한 방식은 디젤 기관의 압축 착화 방식과 유사하다. Gasoline direct injection (GDI) technology is being developed to improve the fuel economy and performance of gasoline engines. Compared with the combustion process of a conventional gasoline engine which is powered by the suction / compression / ignition / explosion / exhaust process of an air / fuel mixture, the direct injection gasoline engine inhales and compresses only air and compresses fuel. To be sprayed. This method is similar to the compression ignition method of a diesel engine.

따라서 직접분사식 가솔린 엔진은 통상적인 가솔린 엔진의 압축비(compression ratio)의 한계를 넘는 높은 압축비를 구현할 수 있어 연비를 극대화할 수 있는 이점이 있다.Therefore, the direct injection gasoline engine can realize a high compression ratio beyond the limit of the compression ratio of the conventional gasoline engine, there is an advantage to maximize the fuel economy.

이러한 직접분사식 가솔린 엔진에서는 연료압력이 매우 중요한 요소가 되며 이를 위하여 고성능의 고압연료펌프가 필요하게 된다.In such direct injection gasoline engines, fuel pressure is a very important factor and high performance high pressure fuel pumps are required for this purpose.

본 출원인에 의해 기 출원된 직접분사식 가솔린 엔진용 고압연료펌프)에 개시된 바에 따르면, 고압연료펌프는 엔진 캠축에 장착되어 캠의 회전력에 의해 펌프 축이 회전하고 그 회전력에 의해 펌프의 피스톤이 운동하여 압력을 형성함으로써 가솔린 연료를 공급하는 구조로 되어 있다.High pressure fuel pump for a direct injection gasoline engine filed by the present applicant), the high pressure fuel pump is mounted on the engine cam shaft, the pump shaft is rotated by the rotational force of the cam and the piston of the pump is moved by the rotational force By forming the pressure, the gasoline fuel is supplied.

이때, 고압연료펌프는 바디에 삽입되어 설치된 피스톤이 승하강하면서 연료를 흡입하고 배출하도록 형성된다. 여기서, 피스톤과 바디 사이에는 씰부재가 설치되어 바디의 내부를 실링하고, 씰부재의 외측에는 별도의 씰 캐리어가 설치되어 씰부재를 보호하도록 이루어진다.At this time, the high-pressure fuel pump is formed so as to suck and discharge the fuel while the piston is inserted into the body is raised and lowered. Here, a seal member is installed between the piston and the body to seal the inside of the body, and a separate seal carrier is installed outside the seal member to protect the seal member.

도 4를 참조하면, 종래의 씰 캐리어(4)는 중심부에 피스톤(3)이 삽입되도록 컵 형상으로 형성되고, 피스톤(3)의 외주면과 씰 캐리어(4)의 내면에 접하도록 씰부재(6)가 설치된다. Referring to FIG. 4, the conventional seal carrier 4 is formed in a cup shape so that the piston 3 is inserted into a central portion thereof, and the seal member 6 is in contact with the outer circumferential surface of the piston 3 and the inner surface of the seal carrier 4. ) Is installed.

이때, 씰 캐리어(4)는 상단이 바디(2)의 하부에 접하도록 연장되게 격벽(4a)이 형성되어 바디(2)에 용접된다.At this time, the seal carrier 4 is formed with a partition wall 4a so that the upper end thereof is in contact with the lower part of the body 2 and welded to the body 2.

또한, 승강 동작된 피스톤(3)의 위치를 복원시키도록 리턴 스프링(5)이 설치되되, 리턴 스프링(5)은 씰 캐리어(4)의 외주면을 감싸도록 설치된다.
In addition, a return spring 5 is installed to restore the position of the raised and lowered piston 3, and the return spring 5 is installed to surround the outer circumferential surface of the seal carrier 4.

그런데, 이러한 씰 캐리어는 별도로 형성되어 바디에 용접에 의해 결합됨에 따라 용접작업시 씰 캐리어 내부에 설치된 씰부재가 열에 의해 손상될 수 있는 문제점이 있다.However, since the seal carrier is formed separately and coupled to the body by welding, the seal member installed inside the seal carrier may be damaged by heat during the welding operation.

또한, 바디와 별도로 형성된 씰 캐리어는 압출되어 내구성이 떨어지므로 리턴 스프링이 복원되면서 씰 캐리어와 연장되게 형성된 격벽을 가압하여 격벽을 파손시키는 문제점이 있다.
In addition, since the seal carrier formed separately from the body is extruded to reduce durability, the barrier spring is damaged by pressing the partition wall formed to extend with the seal carrier while the return spring is restored.

따라서, 본 발명은 전술한 바와 같은 문제점을 해소시키기 위해 안출된 것으로서, 본 발명의 목적은 씰 캐리어가 바디와 결합되는 과정에서 씰부재가 열에 의해 손상되는 것을 방지하도록 하는 직접분사식 가솔린 엔진용 고압연료펌프를 제공함에 있다.Accordingly, the present invention has been made to solve the above-described problems, the object of the present invention is to provide a high pressure fuel for direct injection gasoline engine to prevent the seal member from being damaged by heat in the process of coupling the seal carrier with the body. In providing a pump.

특히, 본 발명의 다른 목적은 씰 캐리어의 내구성을 증대시켜 용이하게 손상되는 것을 방지하도록 함에 있다.
In particular, another object of the present invention is to increase the durability of the seal carrier to prevent easy damage.

상술한 바와 같이 본 발명의 목적을 달성하기 위한 본 발명의 직접 분사식 가솔린 엔진용 고압연료펌프는 측면 양측에 입구측 및 토출측 개공이 형성되며 상부에 댐퍼부가 장착되는 결합부가 형성된 바디와, 상기 바디의 결합부에 결합되며 흡입된 연료의 맥동을 감소시키는 댐퍼부와, 상기 입구측 개공에 결합되며 연료의 공급 유량 및 토출 압력을 제어하는 스필밸브와, 상기 입구측과 토출측 개공에 각각 결합되는 체크밸브 및 상기 바디의 하부에 결합되며 내부에 흡입된 연료의 흡입력을 발생시키는 흡입부재가 구비되는 브래킷이 포함된 직접 분사식 가솔린 엔진용 고압연료펌프에 있어서, 상기 브래킷은 상부 외면에 장착공이 형성된 플랜지부, 상기 흡입부재를 왕복 운동시키는 리턴 스프링을 지지하는 격벽과, 상기 흡입부재와 상기 바디 내부를 씰링하는 씰부재가 설치되는 씰 캐리어가 일체로 형성된 것을 특징으로 한다.As described above, the high-pressure fuel pump for a direct injection gasoline engine of the present invention for achieving the object of the present invention has a body having an inlet side and an outlet side opening formed on both sides thereof, and a coupling part having a damper part mounted thereon; A damper portion coupled to the coupling portion to reduce pulsation of the sucked fuel, a spill valve coupled to the inlet opening and controlling a supply flow rate and a discharge pressure of the fuel, and a check valve coupled to the inlet side and the discharge side opening, respectively. And a bracket coupled to a lower portion of the body and having a suction member for generating a suction force of the fuel sucked therein, wherein the bracket includes a flange having a mounting hole formed at an upper outer surface thereof; A partition for supporting a return spring for reciprocating the suction member, the suction member and the body inside It characterized in that the seal carrier is sealing the seal member is installed integrally formed.

상기 바디는 하단부에 상기 브래킷의 상단 두께만큼 외측에서 내측으로 함몰되는 결합단차가 형성된 것을 특징으로 한다.The body is characterized in that the coupling step is recessed from the outer side to the inner side by the thickness of the upper end of the bracket.

상기 바디의 하단부는 상기 씰부재의 상부 측에 위치된 것을 특징으로 한다.The lower end of the body is characterized in that located on the upper side of the seal member.

상기 브래킷은 상기 바디의 결합단차에 삽입되어 용접에 의해 상기 바디와 결합된 것을 특징으로 한다.The bracket is inserted into the coupling step of the body is characterized in that coupled to the body by welding.

상기 격벽은 상기 브래킷의 개구된 하부 내면에서 연장되어 형성되고, 상기 씰 캐리어는 상기 격벽에서 하부로 연장되어 형성된 것을 특징으로 한다.The partition wall is formed to extend from the lower inner surface of the opening of the bracket, the seal carrier is characterized in that formed extending from the partition wall to the bottom.

상기 흡입부재는 엔진의 캠축에 연결되어 승강 동작하는 피스톤 및 상기 피스톤에 결합되어 복원력을 제공하는 리턴 스프링을 포함하고, 상기 리턴 스프링의 상단은 상기 격벽과 접하도록 설치된 것을 특징으로 한다.
The suction member may include a piston connected to the camshaft of the engine to move up and down and a return spring coupled to the piston to provide a restoring force, and an upper end of the return spring may be installed to contact the partition wall.

이에, 본 발명은 바디에 결합되는 브래킷에 씰 캐리어가 일체형으로 형성됨에 따라 씰 캐리어 주변에서 용접작업이 실시되는 것이 방지되므로 씰 캐리어의 결합과정에서 씰 캐리어에 수용되는 씰부재가 손상되는 것이 미연에 방지되는 효과가 있다.Therefore, the present invention prevents welding from being performed around the seal carrier because the seal carrier is integrally formed on the bracket coupled to the body, so that the seal member accommodated in the seal carrier is damaged during the bonding of the seal carrier. There is an effect that is prevented.

또한, 본 발명은 바디와 브래킷의 용접이 바디의 하단부가 형성된 위치 즉, 씰부재의 상부에서 실시되므로 바디와 브래킷이 용접되는 과정에서 씰부재가 열에 의해 손상되는 것이 방지되는 효과가 있다.In addition, since the welding of the body and the bracket is performed at a position where the lower end of the body is formed, that is, the upper part of the seal member, the seal member is prevented from being damaged by heat in the process of welding the body and the bracket.

또한, 본 발명은 브래킷과 격벽 및 씰 캐리어가 일체로 형성됨에 따라 리턴 스프링에 의해 격벽에 충격이 가해지더라도 브래킷의 내구성이 증대되는 효과가 있다.
In addition, according to the present invention, since the bracket, the partition wall, and the seal carrier are integrally formed, durability of the bracket may be increased even when an impact is applied to the partition wall by the return spring.

도 1은 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프를 도시한 사시도.
도 2는 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프를 도시한 단면도.
도 3은 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프의 바디와 브래킷을 분리하여 도시한 도면.
도 4는 종래의 직접 분사식 가솔린 엔진용 고압연료펌프를 도시한 단면도.1 is a perspective view showing a high-pressure fuel pump for a direct injection gasoline engine according to the present invention.
Figure 2 is a cross-sectional view showing a high pressure fuel pump for a direct injection gasoline engine according to the present invention.
Figure 3 is a view showing a separate body and bracket of the high-pressure fuel pump for direct injection gasoline engine according to the present invention.
Figure 4 is a cross-sectional view showing a conventional high-pressure fuel pump for direct injection gasoline engine.

이하에서는 본 발명의 바람직한 실시예를 첨부된 도면을 참고로 하여 더욱 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

도 1은 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프를 도시한 사시도이고, 도 2는 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프를 도시한 단면도이며, 도 3은 본 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프의 바디와 브래킷을 분리하여 도시한 도면이다.1 is a perspective view showing a high-pressure fuel pump for a direct injection gasoline engine according to the present invention, Figure 2 is a cross-sectional view showing a high-pressure fuel pump for a direct injection gasoline engine according to the present invention, Figure 3 according to the present invention The figure shows a separate body and bracket of the high-pressure fuel pump for direct injection gasoline engine.

도 1, 도 2 및 도 3에 도시된 바와 같이, 본 발명의 본 발명의 직접 분사식 가솔린 엔진용 고압연료펌프는 측면 양측에 입구측 및 토출측 개공(11,12)이 형성되며, 상부에 댐퍼부(30)가 장착되는 결합부(13)가 형성된 바디(10)와, 바디(10)의 하부에 결합되고 내부에 연료의 흡입력을 발생하는 흡입부재(21)가 구비된 브래킷(20)과, 바디(10)의 결합부(13)에 결합되며 흡입된 연료의 맥동을 감소시키는 댐퍼부(30)와, 입구측 개공(11)에 결합되며 연료의 공급 유량 및 토출 압력을 제어하는 스필 밸브(40)와, 입구측 개공(11)에 결합되며 스필 밸브(40)에 연결된 입구측 체크밸브(50) 및 토출측 개공(12)에 결합되는 토출측 체크밸브(60)를 포함한다.1, 2 and 3, the high-pressure fuel pump for a direct injection gasoline engine of the present invention of the present invention, the inlet and discharge side openings 11 and 12 are formed on both sides of the side, and the damper portion at the top. A body 10 having a coupling portion 13 on which the 30 is mounted, a bracket 20 coupled to a lower portion of the body 10 and having a suction member 21 therein for generating a suction force of fuel therein; A damper part 30 coupled to the coupling part 13 of the body 10 to reduce the pulsation of the sucked fuel, and a spill valve coupled to the inlet opening 11 and controlling the supply flow rate and the discharge pressure of the fuel ( 40 and an inlet check valve 50 coupled to the inlet opening 11 and connected to the spill valve 40 and a discharge check valve 60 coupled to the outlet opening 12.

바디(10)는 하부에 후술될 브래킷(20)이 장착되도록 장착부(14)가 형성되고, 바디(10)의 일측에는 연료를 흡입하는 유입구(15)가 형성되며 타측에는 연료를 배출하는 토출구(16)가 형성된다. Body 10 has a mounting portion 14 is formed to be mounted to the bracket 20 to be described later, the inlet 15 is formed on one side of the body 10 to inject fuel and the discharge port for discharging the fuel on the other side ( 16) is formed.

여기서, 장착부(14)에는 브래킷(20)이 결합 될 수 있도록 결합단차(14a)가 형성된다. 결합단차(14a)는 장착부(14) 즉, 바디(10)의 하단부 외측에서 내측으로 함몰되게 형성되되, 브래킷(20)의 상단 두께만큼 함몰되게 형성되는 것이 바람직하다.Here, the mounting step 14 is formed with a coupling step 14a so that the bracket 20 can be coupled. Coupling step 14a is formed to be recessed from the outside of the mounting portion 14, that is, the lower end of the body 10, it is preferably formed to be recessed by the top thickness of the bracket 20.

이에, 브래킷(20)의 상단부는 바디(10)의 하단을 감싸도록 장착부(14)의 결합단차(14a)에 접하도록 위치되어 용접에 의해 결합 될 수 있다. Thus, the upper end of the bracket 20 is positioned to contact the coupling step 14a of the mounting portion 14 to surround the lower end of the body 10 may be coupled by welding.

이때, 바디(10)의 하단부는 후술될 씰부재(28)의 상부 측에 위치되어 바디(10)와 후술될 브래킷(20)이 결합될 때, 바디(10)와 브래킷(20)이 결합될 때 발생하는 열 등에 의해 씰부재(28)가 손상되는 것을 방지하도록 한다.
At this time, the lower end of the body 10 is located on the upper side of the seal member 28 to be described later when the body 10 and the bracket 20 to be described later, the body 10 and the bracket 20 is coupled It is to prevent the seal member 28 from being damaged by the heat generated when.

장착부(14)에는 중앙부에 흡입부재(21)가 결합되도록 하부 결합공(141)이 형성된다. 또한, 바디(10)에는 유입구(15)를 통해 유입된 연료를 바디(10)와 브래킷(20) 사이의 하부공간(17')을 거쳐 댐퍼부(30)로 이송하여 엔진오일의 열에 의해 가열된 가솔린 연료를 신속하게 순환시켜 증기 발생을 방지하는 순환유로(17)가 형성된다. The mounting portion 14 has a lower coupling hole 141 is formed so that the suction member 21 is coupled to the central portion. In addition, the body 10 is transferred to the damper unit 30 through the lower space 17 'between the body 10 and the bracket 20 and is heated by the heat of the engine oil. A circulation passage 17 is formed to quickly circulate the used gasoline fuel to prevent steam generation.

순환유로(17)는 유입구(15)를 통해 유입된 연료를 장착부(14)에 장착된 브래킷(20)과의 사이에 형성된 하부공간(17')을 향해 하방으로 이송하는 하강유로(18) 및 하부공간(17')으로 이송된 연료를 다시 상부의 댐퍼부(30)로 이송하는 상승유로(19)를 포함한다.Circulating flow path 17 is a downward flow path 18 for transporting the fuel introduced through the inlet port 15 downwardly toward the lower space 17 'formed between the bracket 20 mounted on the mounting portion 14 and It includes a rising passage 19 for transferring the fuel transported to the lower space (17 ') back to the upper damper portion (30).

흡입부재(21)는 엔진의 캠축에 연결되어 승강 동작하는 피스톤(22) 및 피스톤(22)에 결합된 리턴 스프링(23)을 포함한다.The suction member 21 includes a piston 22 connected to the camshaft of the engine, and a return spring 23 coupled to the piston 22.

피스톤(22)은 바디(10)의 하부 결합공(141)에 끼워지는 피스톤 가이드(221)의 내부에 결합되며 피스톤 가이드(221)의 외주면에는 기밀성을 유지하기 위해 오링(222) 및 백업링(223)이 결합된다.The piston 22 is coupled to the inside of the piston guide 221 that is fitted to the lower coupling hole 141 of the body 10 and the outer ring of the piston guide 221 O-ring 222 and the backup ring (to maintain airtightness) 223 are combined.

특히, 본 실시예에서 피스톤(22)은 중량을 감소시키기 위하여 내부에 중공이 형성되고, 리턴 스프링(23)은 상부의 직경(D)보다 하부의 직경(d)이 작아지도록 거꾸로 세워진 원뿔 형상으로 형성된 비하이브(beehive) 스프링을 사용할 수 있다. 그리고, 리턴 스프링(23)을 고정하기 위해 피스톤(22)의 하단에 결합되는 리테이너(224)는 리턴 스프링(23)의 하부 직경에 대응되는 직경으로 형성된다. In particular, in the present embodiment, the piston 22 has a hollow formed therein to reduce the weight, and the return spring 23 has a conical shape that is upside down so that the diameter d of the lower part becomes smaller than the diameter D of the upper part. The formed behive spring may be used. The retainer 224 coupled to the lower end of the piston 22 to fix the return spring 23 is formed to a diameter corresponding to the lower diameter of the return spring 23.

이것은 피스톤과 리턴 스프링 및 리테이너의 중량을 최소화하여 리테이너와 캠 사이의 마찰을 감소시켜 마찰에 의한 연료손실을 최소화하고 엔진의 연비를 증대시킬 수 있다.
This minimizes the weight of the piston, return spring and retainer to reduce friction between the retainer and cam, thereby minimizing fuel loss due to friction and increasing engine fuel economy.

브래킷(20)은 바디(10)의 하단부에 결합되도록 상하가 개구된 원통형상으로 형성되고 외주면에 실린더 헤드에 결합될 수 있도록 장착공(25)이 형성된 플랜지부(24)가 형성된다.The bracket 20 is formed in a cylindrical shape having an upper and lower openings to be coupled to the lower end of the body 10, and a flange portion 24 having a mounting hole 25 formed thereon to be coupled to the cylinder head on an outer circumferential surface thereof.

브래킷(20)은 내주면 하부에 엔진오일이 하부 공간(17') 내부로 유입되는 것을 방지하도록 하부공간(17')을 차폐하는 격벽(26)이 형성되고, 격벽(26)의 중앙에는 하부를 향해 돌출되게 형성된 씰 캐리어(27)가 일체로 형성된다.The bracket 20 is formed with a partition wall 26 that shields the lower space 17 'to prevent the engine oil from flowing into the lower space 17' under the inner circumferential surface, and has a lower portion at the center of the partition 26. The seal carrier 27 formed to protrude toward is integrally formed.

즉, 브래킷(20)은 내주면 하부에 격벽(26)이 일체로 연장되게 형성되고, 격벽(26)의 하부로 씰 캐리어(27)가 일체로 연장되게 형성된다. That is, the bracket 20 is formed so that the partition wall 26 integrally extends under the inner circumferential surface, and the seal carrier 27 is integrally extended to the lower part of the partition wall 26.

씰 캐리어(27)의 내부에는 씰 캐리어(27)를 관통하게 설치된 피스톤(22)과 하부공간(17') 사이를 씰링하는 씰부재(28)가 설치되도록 한다. 또한, 씰 캐리어(27)의 하면을 관통하도록 설치되는 피스톤(22)과 씰 캐리어(27) 사이에는 씰 스토퍼(29)가 압입되어 설치되는 것이 바람직하다. The seal member 28 is installed inside the seal carrier 27 to seal between the piston 22 installed through the seal carrier 27 and the lower space 17 '. In addition, it is preferable that the seal stopper 29 is press-fitted between the piston 22 and the seal carrier 27 provided so as to penetrate the lower surface of the seal carrier 27.

그리고, 리턴 스프링(23)의 상부는 브래킷(20)의 씰 캐리어(27)에 외감되게 설치되고, 리턴 스프링(23)을 고정하는 리테이너(224)의 하면은 격벽(26)에 의해 지지된다. 그러므로, 리턴 스프링(23)은 피스톤(22)의 승강 동작시 탄성 변형되면서 피스톤(22)에 복원력을 제공한다. And the upper part of the return spring 23 is externally installed in the seal carrier 27 of the bracket 20, and the lower surface of the retainer 224 which fixes the return spring 23 is supported by the partition 26. As shown in FIG. Therefore, the return spring 23 provides the restoring force to the piston 22 while being elastically deformed during the lifting operation of the piston 22.

또한, 브래킷(20)은 단조나 주조에 의해 브래킷(20)과 격벽(27) 및 씰 캐리어(27)가 일체형으로 형성됨에 따라 내구성이 강화되어 피스톤(22)이 상하로 왕복운동을 하더라도 용이하게 파손되는 것이 방지된다. In addition, as the bracket 20 is integrally formed by the forging or casting of the bracket 20, the partition 27, and the seal carrier 27, durability is enhanced, so that the piston 22 can be easily reciprocated up and down. Breakage is prevented.

그리고, 이때, 바디(10)의 하단부는 씰부재(28)의 상부 측에 위치되고, 바디(10)와 브래킷(20)의 결합은 결합단차(14a)에서 용접작업이 실시됨에 따라 용접작업이 씰부재(28)의 위치보다 상부에서 이루어지므로 용접열에 의해 열에 약한 씰부재(28)나 씰 스토퍼(29)가 손상되는 것이 방지된다. And, at this time, the lower end of the body 10 is located on the upper side of the seal member 28, the coupling of the body 10 and the bracket 20 is a welding operation is carried out as the welding operation is carried out in the coupling step (14a) Since it is made above the position of the seal member 28, it is prevented that the seal member 28 or the seal stopper 29 which is weak in heat by welding heat is damaged.

바디의 내부에는 입구측 및 토출측 개공(11)과 연통하여 피스톤(22)의 상부가 위치되는 챔버(29)가 형성된다.
In the body, a chamber 29 is formed in communication with the inlet side and the discharge side opening 11 so that the upper portion of the piston 22 is located.

이와 같이 구성된 직접 분사식 가솔린 엔진용 고압연료펌프는 피스톤(22)의 승강동작에 의해 챔버(29) 내에 흡입력 및 토출력이 생성됨에 따라, 캠 축의 회전에 연동하여 피스톤을 승강동작시켜 바디 내부에 연료의 흡입 및 토출 압력을 형성할 수 있다.The high-pressure fuel pump for the direct injection gasoline engine configured as described above generates suction force and earth output in the chamber 29 by lifting and lowering the piston 22, and moves the piston up and down in conjunction with the rotation of the cam shaft to fuel the inside of the body. Suction and discharge pressure can be formed.

이때, 피스톤(22)의 승강동작에 의해 흡입된 연료는 댐퍼부(30)에 의해 맥동이 감소되며, 입구측 개공(11)으로 공급될 때 스필밸브(40)에 의해 유량과 토출압력이 제어된다. 또한, 입구측과 토출측 개공(11,12)에 각각 결합된 체크밸브(50,60)는 연료의 역류를 방지한다.
At this time, the pulsation of the fuel sucked by the lifting operation of the piston 22 is reduced by the damper part 30, and the flow rate and the discharge pressure are controlled by the spill valve 40 when supplied to the inlet opening 11. do. In addition, the check valves 50 and 60 coupled to the inlet and discharge side openings 11 and 12 respectively prevent the back flow of fuel.

따라서, 본 발명에 따른 직접 분사식 가솔린 엔진용 고압연료펌프는 바디에 결합되는 브래킷에 씰 캐리어가 일체형으로 형성됨에 따라 씰 캐리어 주변에서 용접작업이 실시되는 것이 방지되므로 씰 캐리어의 결합과정에서 씰 캐리어에 수용되는 씰부재가 손상되는 것을 미연에 방지하고, 리턴 스프링에 의해 격벽에 충격이 가해지더라도 브래킷의 내구성이 증대되는 효과가 있다.
Therefore, the high pressure fuel pump for the direct injection gasoline engine according to the present invention is prevented from being welded around the seal carrier because the seal carrier is integrally formed on the bracket coupled to the body, so that the seal carrier is coupled to the seal carrier during the coupling process of the seal carrier. There is an effect of preventing damage to the seal member to be accommodated, and increasing durability of the bracket even when an impact is applied to the partition wall by the return spring.

10 : 바디 11 : 입구측 개공
12 : 토출측 개공 13 : 결합부
14 : 장착부 14a : 결합단차
15 : 유입구 16 : 토출구
17 : 순환유로 20 : 브래킷
21 : 흡입부재 22 : 피스톤
23 : 리턴 스프링 24 : 플랜지부
25 : 장착공 26 : 격벽
27 : 씰 캐리어 28 : 씰 부재
29 : 씰 스토퍼 40 : 스필밸브
50,60 : 체크밸브10: body 11: opening of the entrance side
12: opening of the discharge side 13: coupling portion
14: mounting portion 14a: coupling step
15 inlet port 16 outlet port
17: circulation passage 20: bracket
21: suction member 22: piston
23: return spring 24: flange
25: mounting hole 26: bulkhead
27: seal carrier 28: seal member
29: seal stopper 40: spill valve
50,60: check valve

Claims (6)

측면 양측에 입구측 및 토출측 개공이 형성되며 상부에 댐퍼부가 장착되는 결합부가 형성된 바디와, 상기 바디의 결합부에 결합되며 흡입된 연료의 맥동을 감소시키는 댐퍼부와, 상기 입구측 개공에 결합되며 연료의 공급 유량 및 토출 압력을 제어하는 스필밸브와, 상기 입구측과 토출측 개공에 각각 결합되는 체크밸브 및 상기 바디의 하부에 결합되며 내부에 흡입된 연료의 흡입력을 발생시키는 흡입부재가 구비되는 브래킷이 포함된 직접 분사식 가솔린 엔진용 고압연료펌프에 있어서,
상기 브래킷은 상부 외면에 장착공이 형성된 플랜지부, 상기 흡입부재를 왕복 운동시키는 리턴 스프링을 지지하는 격벽과, 상기 흡입부재와 상기 바디 내부를 씰링하는 씰부재가 설치되는 씰 캐리어가 일체로 형성된 것을 특징을 하는 직접분사식 가솔린 엔진용 고압연료펌프.
The inlet and discharge side openings are formed at both sides of the side, and a body having a coupling portion on which a damper portion is mounted, a damper portion coupled to the coupling portion of the body and reducing pulsation of the inhaled fuel, and coupled to the inlet opening. A bracket is provided with a spill valve for controlling the supply flow rate and the discharge pressure of the fuel, a check valve coupled to the inlet side and the discharge side opening, and a suction member coupled to the lower part of the body and generating suction force of the fuel sucked therein. In the high-pressure fuel pump for a direct injection gasoline engine included,
The bracket is integrally formed with a seal carrier having a flange portion having a mounting hole formed on an upper outer surface, a partition wall supporting a return spring for reciprocating the suction member, and a seal member for sealing the suction member and the inside of the body. High pressure fuel pump for direct injection gasoline engines.
청구항 1에 있어서,
상기 바디는 하단부에 상기 브래킷의 상단 두께만큼 외측에서 내측으로 함몰되는 결합단차가 형성된 것을 특징으로 하는 직접 분사식 가솔린 엔진용 고압연료펌프.
The method according to claim 1,
The body is a high-pressure fuel pump for a direct injection gasoline engine, characterized in that the coupling step is formed in the lower end indented from the outside to the inside by the thickness of the upper end of the bracket.
청구항 2에 있어서,
상기 바디의 하단부는 상기 씰부재의 상부 측에 위치된 것을 특징으로 하는 직접 분사식 가솔린 엔진용 고압연료펌프.
The method according to claim 2,
The high pressure fuel pump for the direct injection gasoline engine, characterized in that the lower end of the body is located on the upper side of the seal member.
청구항 3에 있어서,
상기 브래킷은 상기 바디의 결합단차에 삽입되어 용접에 의해 상기 바디와 결합된 것을 특징으로 하는 직접 분사식 가솔린 엔진용 고압연료펌프.
The method according to claim 3,
The bracket is inserted into the coupling step of the body high pressure fuel pump for a direct injection gasoline engine, characterized in that coupled to the body by welding.
청구항 1에 있어서,
상기 격벽은 상기 브래킷의 개구된 하부 내면에서 연장되어 형성되고, 상기 씰 캐리어는 상기 격벽에서 하부로 연장되어 형성된 것을 특징으로 하는 직접 분사식 가솔린 엔진용 고압연료펌프.
The method according to claim 1,
The partition wall is formed to extend from the lower inner surface of the opening of the bracket, the seal carrier is a high-pressure fuel pump for a direct injection gasoline engine, characterized in that formed extending from the partition to the bottom.
청구항 5에 있어서,
상기 흡입부재는 엔진의 캠축에 연결되어 승강 동작하는 피스톤; 및
상기 피스톤에 결합되어 복원력을 제공하는 리턴 스프링;을 포함하고,
상기 리턴 스프링의 상단은 상기 격벽과 접하도록 설치된 것을 특징으로 하는 직접 분사식 가솔린 엔진용 고압연료펌프.
The method according to claim 5,
The suction member is connected to the cam shaft of the engine piston to move up and down; And
A return spring coupled to the piston to provide a restoring force;
The upper end of the return spring is a high-pressure fuel pump for a direct injection gasoline engine, characterized in that installed in contact with the partition.
KR1020110146490A 2011-12-29 2011-12-29 High presure fuel pump for direct injection type gasoline engine KR101349641B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103993999A (en) * 2014-05-25 2014-08-20 辽宁新风企业集团有限公司 High-pressure oil pump for heavy-duty diesel engine
CN106050505A (en) * 2015-04-09 2016-10-26 现代凯菲克株式会杜 Damper assembly of high-pressure fuel pump
WO2017018646A1 (en) * 2015-07-24 2017-02-02 (주)모토닉 Direct-type lpi system and high-pressure fuel pump applied to same
KR20190008240A (en) * 2016-05-19 2019-01-23 로베르트 보쉬 게엠베하 High-pressure fuel pump
WO2022122357A1 (en) * 2020-12-09 2022-06-16 Robert Bosch Gmbh High-pressure fuel pump for an internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001295728A (en) * 2000-04-18 2001-10-26 Toyota Motor Corp High pressure pump
JP5244761B2 (en) * 2009-10-06 2013-07-24 日立オートモティブシステムズ株式会社 High pressure fuel supply pump

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103993999A (en) * 2014-05-25 2014-08-20 辽宁新风企业集团有限公司 High-pressure oil pump for heavy-duty diesel engine
CN106050505A (en) * 2015-04-09 2016-10-26 现代凯菲克株式会杜 Damper assembly of high-pressure fuel pump
WO2017018646A1 (en) * 2015-07-24 2017-02-02 (주)모토닉 Direct-type lpi system and high-pressure fuel pump applied to same
KR20190008240A (en) * 2016-05-19 2019-01-23 로베르트 보쉬 게엠베하 High-pressure fuel pump
WO2022122357A1 (en) * 2020-12-09 2022-06-16 Robert Bosch Gmbh High-pressure fuel pump for an internal combustion engine

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