KR20040021733A - High pressure supply pump - Google Patents

High pressure supply pump Download PDF

Info

Publication number
KR20040021733A
KR20040021733A KR1020020051339A KR20020051339A KR20040021733A KR 20040021733 A KR20040021733 A KR 20040021733A KR 1020020051339 A KR1020020051339 A KR 1020020051339A KR 20020051339 A KR20020051339 A KR 20020051339A KR 20040021733 A KR20040021733 A KR 20040021733A
Authority
KR
South Korea
Prior art keywords
plunger
fuel
high pressure
valve
control valve
Prior art date
Application number
KR1020020051339A
Other languages
Korean (ko)
Other versions
KR100539209B1 (en
Inventor
전상엽
장욱희
Original Assignee
주식회사 두원정공
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 두원정공 filed Critical 주식회사 두원정공
Priority to KR10-2002-0051339A priority Critical patent/KR100539209B1/en
Publication of KR20040021733A publication Critical patent/KR20040021733A/en
Application granted granted Critical
Publication of KR100539209B1 publication Critical patent/KR100539209B1/en

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE: A high pressure supply pump is provided to reduce an increase in an oil temperature by reducing an amount of fuel of a high pressure spilled from a pressure control valve. CONSTITUTION: Three barrel parts are formed integratedly with a housing in a radial direction. Plungers(7) are matched with the barrel parts respectively. A pre-stroke control valve(1) formed of a sheet type needle valve, an amateur, and a solenoid is installed at an inlet of one plunger. Sheet type check valves are formed at inlets of the other plungers and ball type check valves(9) are formed at outlets of the two plungers. The two plungers accumulate pressures of fuel by pumping full strokes. The plunger having the pre-stroke control valve controls a close point of the inlet valve to discharge fuel as much as an amount necessary for a jet amount and a target pressure of a common rail.

Description

고압 서플라이 펌프{High pressure supply pump}High pressure supply pump

본 발명은 디젤엔진 연료분사장치인 커먼레일 인젝션 시스템의 고압 서플라이 펌프에 관한 것이다.The present invention relates to a high pressure supply pump of a common rail injection system which is a diesel engine fuel injection device.

고압 서플라이 펌프는 일렉트릭 프리 피드펌프에 의해서 저압의 연료가 가압된 후, 고압 서플라이 펌프의 하우징과 분리 가공되어 조립된 배럴과 플런저로 이루어진 플런저실로 공급되어 플런저의 왕복운동에 의해 흡입 압축하여 커먼레일에 연료를 축압시키게 된다.The high pressure supply pump is pressurized with low pressure fuel by the electric pre-feed pump, and then supplied to the plunger chamber composed of a barrel and plunger, which is separately processed and assembled with the housing of the high pressure supply pump, and sucked and compressed by the reciprocating motion of the plunger to the common rail. Accumulate fuel.

이러한 고압의 연료를 축압시키는 종래의 서플라이 펌프의 유량 및 압력제어는 플런져에 의해 가압된 고압의 연료가 출구측 체크밸브를 통과하여 축압되고, 고압의 연료가 축압된 유로에 장착된 솔레노이드와 볼밸브 및 오리피스로 구성되는 압력 컨트롤밸브가 커먼레일에 축압된 고압의 연료를 직접 제어하도록 구성되어 있다.The flow rate and pressure control of the conventional supply pump for accumulating such high-pressure fuel is such that the high-pressure fuel pressurized by the plunger is accumulated through the outlet check valve, and the high-pressure fuel is stored in the solenoid and the ball installed in the accumulator flow path. A pressure control valve consisting of a valve and an orifice is configured to directly control the high pressure fuel accumulated in the common rail.

그러나 전기한 종래 기술의 고압 서플라이 펌프는 프리-피드펌프가 장착되어 있지 않고 압력 및 유량제어에 있어서 고압의 연료를 직접 제어 하기 때문에 솔레노이드의 소모전력이 크고, 인젝션(Injection) 필요량 이상의 유량을 고압화 하기 때문에 소비동력이 커지며, 고압의 연료가 압력 컨트롤밸브의 오리피스를 통과하여 스필되기 때문에 유온의 상승이 커지게 되는 문제점이 있다.However, since the conventional high pressure supply pump is not equipped with a pre-feed pump and directly controls high-pressure fuel in pressure and flow control, the power consumption of the solenoid is large and the flow rate higher than the injection amount is increased. As a result, the consumption power is increased, and since the high pressure fuel is spilled through the orifice of the pressure control valve, there is a problem in that the oil temperature rises.

본 발명은 상기와 같은 문제점을 제거하기 위하여 안출된 것으로서,The present invention has been made to eliminate the above problems,

고압의 연료를 축압하여 목표압력을 유지 제어할 경우 압력 컨트롤밸브에 의해 스필되는 연료가 리턴됨으로써 발생하는 유온의 상승을 줄이기 위해 입구측 저압의 연료 즉, 플런져실로 흡입된 연료를 가압하는 행정초기에 커먼레일의 목표압력과 필요분사량을 형성하기 위해 계산된 필요 연료량을 제외한 연료를 플러저실 입구 측에 설치한 프리스트로크 컨트롤밸브쪽으로 다시 스필시킨 후, 필요 연료량을 가압하기 위한 입구측 밸브의 닫히는 시점을 제어하도록 입구측 프리스트로크 컨트롤밸브의 솔레노이드에 전류를 인가하여 밸브를 닫음로써 연료를 가압 토출 시키도록 하는 프리 스트로크 컨트롤밸브를 3개의 플런저 중 1개 또는 3개의 플런저에 적용하여 저압의 연료를 스필 시키고 커먼레일에 설치된 압력 컨트롤밸브에서 스필되는 고압의 연료량을 절감시키므로서 유온상승을 현저히 저감한 고압 서플라이 펌프를 제공함에 본 발명의 목적이 있다.When accumulating high-pressure fuel to maintain and control the target pressure, the initial stroke of pressurizing the low-pressure fuel, ie, the fuel sucked into the plunger chamber, to reduce the rise in oil temperature caused by the return of fuel spilled by the pressure control valve. The fuel, except for the required fuel amount calculated to form the target pressure and required injection amount of the common rail, is spilled back to the prestroke control valve installed at the inlet of the plunger chamber, and then the inlet valve for pressurizing the required fuel amount is closed. To apply the current to the solenoid of the inlet side pre-stroke control valve to close the valve and pressurize and discharge the fuel to one or three of the plungers to spill the low pressure fuel. High pressure smoke spilled from pressure control valve installed on common rail It is an object of the present invention to provide a high pressure supply pump that significantly reduces the oil temperature rise while reducing the amount of material.

도 1 은 본 발명의 개략구성도1 is a schematic configuration diagram of the present invention

도 2 는 본 발명의 단면도로서, 도2a는 측단면도이고, 도2b는 정단면도이다Figure 2 is a cross-sectional view of the present invention, Figure 2a is a side cross-sectional view, Figure 2b is a front sectional view.

도 3 은 본 발명의 프리 스트로크 콘트롤(Pre-Stroke Control) 작동도로서, 도3a는 흡입상태의 작동설명도이고, 도3b는 스필상태의 작동설명도, 도3c는 가압토출 상태의 작동설명도이다.Figure 3 is a pre-stroke control operation (Pre-Stroke Control) of the present invention, Figure 3a is an operation diagram of the suction state, Figure 3b is an operation diagram of the spill state, Figure 3c is an operation diagram of the pressurized discharge state to be.

도 4 는 본 발명 고압 서플라이펌프의 작동상태를 도시한 그래프.Figure 4 is a graph showing the operating state of the high pressure supply pump of the present invention.

도 5 는 종래의 펌프 단면도5 is a cross-sectional view of a conventional pump

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

1: 프리스트로크 컨트롤밸브 2: 압력 컨트롤밸브1: pre-stroke control valve 2: pressure control valve

3: 펌프 하우징 4: 프리피드 펌프3: pump housing 4: prefeed pump

5: 캠 샤프트 6: 앵글 부시5: camshaft 6: angle bush

7: 플런저 8: 입구측 체크밸브7: Plunger 8: Inlet Check Valve

9: 출구측 볼밸브 10: 솔레노이드9: outlet ball valve 10: solenoid

11: 니들밸브 12: 니들밸브 스프링11: needle valve 12: needle valve spring

13: 아마츄어 14: 스프링 시트13: amateur 14: spring seat

15: 슈 16: 플런저 스프링15: shoe 16: plunger spring

17: 오버플로우 밸브 18: 배럴17: overflow valve 18: barrel

전기한 목적을 이루기 위한 기술수단으로는, 고압의 연료 축압시 발생하는 유온상승을 낮추기 위해 3개의 플런저(7)중 1개의 플런저(7)에 솔레노이드(10)로 작동되는 프리스트로크 컨트롤밸브(1)를 설치하여 2개의 플런저(7)는 전 스트로크를 펌핑하여 연료를 축압하고 프리스트로크 컨트롤밸브(1)가 설치된 플런저(7)는 인젝터 분사량과 커먼레일의 목표압력형성에 필요한 연료량 만큼을 토출하도록 제어하게 된다.As a technical means for achieving the above-mentioned purpose, a prestroke control valve (1) actuated by a solenoid (10) to one of the three plungers (7) in order to lower the oil temperature rise generated during the high pressure fuel accumulation. ), The two plungers (7) pump the entire stroke to accumulate fuel, and the plungers (7) equipped with the free stroke control valve (1) discharge the amount of fuel required for injector injection and the target pressure of the common rail. Control.

이하, 본 발명의 구성 및 작용을 첨부도면에 의하여 상세히 설명한다.Hereinafter, the configuration and operation of the present invention will be described in detail by the accompanying drawings.

도 1 은 본 발명의 구성을 나타낸 커먼레일 인젝션 시스템의 개략도이다.1 is a schematic diagram of a common rail injection system showing a configuration of the present invention.

프리피드 펌프(4)에 의해서 연료 탱크의 연료를 1차 가압하여 고압펌프의 플런저실 입구측 체크밸브(8)와 연결된 유로로 보내지게 되고, 유로가 일정압력 이상이 되면 오버 플로우 밸브(17)를 통하여 펌프 하우징(3)으로 들어가 부품의 윤활 및 냉각작용을 한 후, 다시 연료탱크로 리턴 된다.The fuel in the fuel tank is first pressurized by the prefeed pump 4 and sent to the flow path connected to the plunger chamber inlet check valve 8 of the high pressure pump. When the flow path is above a certain pressure, the overflow valve 17 After entering the pump housing (3) through the lubrication and cooling of the parts, it is returned to the fuel tank again.

또한, 3개의 플런저실중 기계적인 입구측 체크밸브(8)가 설치된 2개의 플런저실로 유입된 연료는 캠 샤프트(5)의 회전에 의하여 플런저(7)의 왕복운동으로 연료를 가압하게 되어 플런저(7)의 전 스트로크 펌핑 토출되고, 인젝터의 분사량과 커먼레일의 압력을 모니터링하여 목표압력 대비 필요연료량을 계산하고, 프리스트로크 컨트롤밸브(1)의 솔레노이드(10)에 전류를 인가하여 밸브를 닫음으로써 필요 연료량을 토출하여 목표압력을 맞추게 된다.In addition, the fuel introduced into the two plunger chambers in which the mechanical inlet check valves 8 are installed in the three plunger chambers pressurizes the fuel in the reciprocating motion of the plunger 7 by the rotation of the cam shaft 5. 7) All strokes are pumped and discharged, the required amount of fuel is compared to the target pressure by monitoring the injection volume of the injector and the pressure of the common rail, and the current is applied to the solenoid 10 of the prestroke control valve 1 to close the valve. The required fuel amount is discharged to meet the target pressure.

또한, 프리스트로크 컨트롤밸브(1)에 의해 목표압보다 초과될 경우 커먼레일에 설치된 압력컨트롤밸브에 의해 압력이 조절되도록 구성이 되어 있다.In addition, when the pressure exceeds the target pressure by the prestroke control valve 1, the pressure is controlled by a pressure control valve installed in the common rail.

도 2a 및 도 2b는 본 발명의 단면 설명도로서, 펌프 하우징(3)내에 편심 캠이 가공된 캠 샤프트(5)를 설치하고 편심캠 외면에 삼각형 모양의 앵글부시(6)를 취부하고, 앵글부시(6) 평면에는 플런저(7) 끝단에 체결된 스프링시트(14)와 슈(15)가 안착되어 있고, 레이디얼 방향으로 3개의 배럴(18)부를 하우징(3)과 일체로 가공하여 유로의 연결부를 없애도록 가공한 것이다.2A and 2B are cross-sectional explanatory views of the present invention, in which a camshaft 5 in which an eccentric cam is machined is installed in the pump housing 3, and a triangular angle bush 6 is mounted on the outer surface of the eccentric cam. A spring seat 14 and a shoe 15 fastened to the end of the plunger 7 are seated on the bush 6 plane, and the three barrels 18 are integrally machined with the housing 3 in the radial direction. It is machined to get rid of the joint of.

이와 같이 가공된 각 배럴(18)부에 플런저(7)를 매칭하고, 2개의 플런저(7)실 입구에는 시트형 체크밸브와 출구측에는 볼형 체크밸브(9)를 설치하며, 나머지 1개의 플런저(7)실 입구에는 시트형 니들밸브(11)와 아마츄어(13) 그리고 솔레노이드(10)로 구성된 프리스트로크 컨트롤밸브(1)와 출구측에 볼형 체크밸브(9)를 설치한 펌핑유닛을 다른 2개의 배럴부와 120도 간격으로 설치한 것이다.The plunger 7 is matched to each of the barrels 18 processed in this way, a seat type check valve is installed at the inlet of the two plungers 7 and a ball type check valve 9 is provided at the outlet side, and the other one plunger 7 is provided. At the inlet of the chamber, a pre-stroke control valve (1) consisting of a seat-type needle valve (11), an armature (13) and a solenoid (10), and a pumping unit provided with a ball-type check valve (9) at the outlet side are provided. And 120 degrees apart.

이와 같이 설치된 펌핑유닛은 캠 샤프트(5)가 회전함에 따라 프리피드펌프(4)에 의하여 송유된 저압의 연료가 플런저(7)실 입구와 연결된 유로로 유입 되고, 플런저 스프링 (16)에 의해 플런저(7)가 리턴되는 흡입행정과정에 있는 펌핑유닛은 플런저(7)실로 연료가 유입되게 되고, 압축행정에 있는 펌핑유닛은 캠프로파일이 상승함에 따라 앵글부시(6)와 슈(15)의 슬라이딩과 함께 상승하게 되어 플런저(7)가 상승 플런저(7)실에 흡입되어 있는 연료를 가압하여 출구측 볼밸브(9)를 통하여 출구측 어댑터와 연결된 커먼레일에 연료를 축압시키고, 입구측에 솔레노이드(10)로 구성된 프리스트로크 컨트롤밸브(1)가 설치된 펌핑 유닛은 입구측 밸브의 닫히는 시점을 조절함으로써 토출유량을 조절하도록 하는 것이다.In the pumping unit installed as described above, as the cam shaft 5 rotates, the low pressure fuel supplied by the prefeed pump 4 flows into the flow path connected to the plunger 7 chamber inlet, and the plunger spring 16 The pumping unit in the suction stroke (7) is returned to the plunger (7) chamber and the pumping unit in the compression stroke of the angle bush (6) and the shoe (15) as the camp profile rises The plunger 7 presses the fuel sucked into the ascending plunger 7 chamber by accumulating the fuel to the common rail connected to the outlet adapter through the outlet ball valve 9, The pumping unit in which the prestroke control valve 1 composed of the solenoids 10 is installed is to adjust the discharge flow rate by adjusting the closing timing of the inlet valve.

도 3a 내지 도 3c는 프리스트로크 컨트롤밸브(1)의 각 행정별 작동상태를 도시한 것이고, 도 4는 이를 그래프로 나타낸 것이다.3a to 3c show the operating state of each stroke of the prestroke control valve 1, and FIG. 4 shows it graphically.

플런저(7)가 리턴되는 흡입행정시에는 도3a의 도시와 같이 솔레노이드(10)에 지지된 니들스프링(12)에 의하여 니들밸브(11)가 열려 연료를 흡입하게 되고, 도3c의 도시와 같이 캠 샤프트(5)가 회전하여 플런저(7)가 압축하는 행정에는 모니터링 되는 커먼레일의 압력과 분사량에 따라 계산된 필요 연료량이 결정되고 프리스트로크 컨트롤밸브(1)가 닫히는 시점이 결정된다.When the plunger 7 is returned to the suction stroke, the needle valve 11 is opened by the needle spring 12 supported by the solenoid 10 as shown in FIG. 3A to inhale fuel, and as shown in FIG. 3C. On the stroke where the cam shaft 5 rotates and the plunger 7 compresses, the required fuel amount calculated according to the pressure and injection amount of the monitored common rail is determined, and the time point at which the prestroke control valve 1 is closed is determined.

솔레노이드(10)에 전류가 인가되기 전에는 밸브가 열려있기 때문에 압축행정시 플런저(7)실에 있던 연료는 다시 입구쪽으로 스필되고, 또한 결정된 밸브의 닫힘 시기에는 솔레노이드(10)에 전류를 인가하여 아마츄어(13)에 솔레노이드(10) 흡인력이 작용하여 아마츄어(13)에 조립된 니들밸브(11)가 닫히도록 함으로써 고압을 형성하여 출구측 체크밸브를 통하여 커먼레일에 연료를 축압하여 목표압력을 형성하게 되는 과정을 나타낸 것이다.Since the valve is open before the current is applied to the solenoid 10, the fuel in the plunger 7 chamber is spilled back toward the inlet during compression stroke, and at the closing time of the determined valve, the current is applied to the solenoid 10 by the armature. The suction force of the solenoid 10 acts on the 13 to close the needle valve 11 assembled in the armature 13 to form a high pressure, and accumulate fuel in the common rail through the outlet check valve to form a target pressure. The process is shown.

이상과 같이 본 발명의 고압서플라이 펌프는 프리피드펌프와 3개의 펌핑 유닛중 1개의 펌핑 유닛의 입구측에 프리스트로크 컨트롤밸브를 적용하여 이에 의해 인젝션량과 커먼레일의 목표 압력을 형성하도록 축압 연료량을 조절하여 고압의 압력조절밸브에서의 리턴유량을 최소화하여 유온의 상승을 낮춤은 물론, 플런저가 매칭되는 배럴부를 하우징과 일체로 가공함으로써 고압유로 연결부의 누유 가능성을제거하여 안정성을 확보하였다.As described above, the high pressure supply pump of the present invention applies a prestroke control valve to the inlet side of the prefeed pump and one of the three pumping units, thereby accumulating the accumulated fuel amount to form the injection amount and the target pressure of the common rail. By minimizing the return flow rate in the high pressure pressure control valve, the oil temperature rise is lowered, and the barrel part where the plunger is matched is integrally processed with the housing to eliminate the possibility of leakage of the high pressure oil passage connecting part to secure stability.

Claims (2)

축압식 연료분사장치에서 커먼레일에 연료를 축압시키는 고압 서플라이펌프에 있어서,In the high pressure supply pump for accumulating fuel to the common rail in the accumulator fuel injection device, 펌프 하우징(3)내에 편심 캠이 가공된 캠 샤프트(5)를 설치하고, 편심캠 외면에 삼각형 모양의 앵글부시(5)를 취부하고 앵글부시(5) 평면에 플런저(7) 끝단에 체결된 스프링시트(14)와 슈(15)가 안착되어 있고, 레이디얼 방향으로 3개의 배럴(18)부에 플런저(7)를 매칭하고, 3개의 펌핑유닛중 2개의 펌핑유닛은 플런저(7)실의 입구쪽에 시트형 체크밸브와(8)와 플런저(7)실의 출구쪽에는 볼밸브(9)를 설치하였고 1개의 펌핑유닛에는 플런저(7)실 입구에 시트형 니들밸브와 아마츄어(13) 그리고 솔레노이드(10)로 구성된 프리스트로크 컨트롤밸브(1)와 출구측에 볼형 체크밸브(9)를 설치하여 3개의 펌핑유닛을 120도 간격으로 위치되게 형성함을 특징으로 하는 고압 서플라이 펌프.A camshaft 5 in which an eccentric cam is machined is installed in the pump housing 3, and a triangular angle bush 5 is mounted on the outer surface of the eccentric cam, and the plunger 7 end is fastened to the angle bush 5 plane. The spring seat 14 and the shoe 15 are seated, and the plunger 7 is matched to the three barrels 18 in the radial direction, and two of the three pumping units are the plunger 7 seals. A seat-type check valve (8) and a ball valve (9) are installed at the outlet of the plunger (7) chamber at the inlet side of the chamber, and a seat-type needle valve, an amateur (13) and a solenoid at the inlet of the plunger (7) at one pumping unit. A high-pressure supply pump, characterized in that three pumping units are formed at 120-degree intervals by installing a ball stroke check valve (9) on the prestroke control valve (1) and an outlet side composed of (10). 제 1 항에 있어서, 3개의 배럴부(6)를 펌프하우징(3)과 일체로 형성하여 출구측 볼밸브(9)를 지나는 고압유로의 연결부를 제거함을 특징으로 하는 고압 서플라이 펌프.2. The high pressure supply pump as claimed in claim 1, wherein the three barrel portions (6) are integrally formed with the pump housing (3) to remove the connection of the high pressure flow passage passing through the outlet side ball valve (9).
KR10-2002-0051339A 2002-08-29 2002-08-29 High pressure supply pump KR100539209B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2002-0051339A KR100539209B1 (en) 2002-08-29 2002-08-29 High pressure supply pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR10-2002-0051339A KR100539209B1 (en) 2002-08-29 2002-08-29 High pressure supply pump

Publications (2)

Publication Number Publication Date
KR20040021733A true KR20040021733A (en) 2004-03-11
KR100539209B1 KR100539209B1 (en) 2005-12-27

Family

ID=37325727

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-2002-0051339A KR100539209B1 (en) 2002-08-29 2002-08-29 High pressure supply pump

Country Status (1)

Country Link
KR (1) KR100539209B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH074332A (en) * 1993-06-18 1995-01-10 Yamaha Motor Co Ltd High pressure fuel pump for internal combustion engine
DE19729790C2 (en) * 1997-07-11 2002-08-29 Bosch Gmbh Robert Radial piston pump for high-pressure fuel supply
DE19753593A1 (en) * 1997-12-03 1999-06-17 Bosch Gmbh Robert Radial piston pump for high-pressure fuel supply
DE69919658T2 (en) * 1998-05-26 2005-09-15 Caterpillar Inc., Peoria HYDRAULIC SYSTEM WITH A PUMP WITH A VARIABLE DELIVERY VOLUME
KR20020017397A (en) * 2000-08-30 2002-03-07 박상록 High-pressure supply pump
DE10057244A1 (en) * 2000-11-18 2002-06-06 Bosch Gmbh Robert Fuel injection system for internal combustion engines with improved starting behavior

Also Published As

Publication number Publication date
KR100539209B1 (en) 2005-12-27

Similar Documents

Publication Publication Date Title
EP1365142B1 (en) High-pressure fuel pump
JP4415929B2 (en) High pressure fuel supply pump
KR101608706B1 (en) Fuel system for an internal combustion engine
US6581577B1 (en) Pump arrangement for providing fuel at high pressure
US10253741B2 (en) High-pressure fuel pump
KR100339470B1 (en) High pressure fuel pumping apparatus
US7273036B2 (en) High-pressure fuel pump with a ball valve in the low-pressure inlet
US6959694B2 (en) Fuel injection system for an internal combustion engine
JP3819208B2 (en) Variable discharge fuel supply system
JP2008064013A (en) High pressure fuel supply pump
US10094346B1 (en) Fuel pump with an improved maximum-pressure valve for a direct-injection system
JP2003065184A (en) Operation method of internal combustion engine, computer program, control and/or adjusting device, and fuel system
WO2018012211A1 (en) High-pressure fuel supply pump
US11525427B2 (en) High pressure fuel pump and fuel supply system
JP4861958B2 (en) High pressure fuel pump
KR100539209B1 (en) High pressure supply pump
WO2022091554A1 (en) Fuel pump
US20220316470A1 (en) Fuel Pump
JP7139265B2 (en) High-pressure fuel supply pump and relief valve mechanism
CN112761841A (en) Fuel injection pump for preventing difficult starting of diesel engine
JP2010007564A (en) Fuel supply device
JP4241611B2 (en) Valve device for fuel injection pump
JP3738753B2 (en) High pressure fuel supply device
WO2023209949A1 (en) Fuel pump
JP2003247474A (en) High pressure fuel pump

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20121213

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20131213

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20141218

Year of fee payment: 10

FPAY Annual fee payment

Payment date: 20151216

Year of fee payment: 11

FPAY Annual fee payment

Payment date: 20171220

Year of fee payment: 13

FPAY Annual fee payment

Payment date: 20181217

Year of fee payment: 14

FPAY Annual fee payment

Payment date: 20191218

Year of fee payment: 15