WO2010060834A1 - High pressure pump - Google Patents

High pressure pump Download PDF

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Publication number
WO2010060834A1
WO2010060834A1 PCT/EP2009/065351 EP2009065351W WO2010060834A1 WO 2010060834 A1 WO2010060834 A1 WO 2010060834A1 EP 2009065351 W EP2009065351 W EP 2009065351W WO 2010060834 A1 WO2010060834 A1 WO 2010060834A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pump
fluid
cylinder housing
valve
Prior art date
Application number
PCT/EP2009/065351
Other languages
German (de)
French (fr)
Inventor
Ngoc-Tam Vu
Original Assignee
Continental Automotive Gmbh
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2010060834A1 publication Critical patent/WO2010060834A1/en

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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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail

Definitions

  • the invention relates to a high-pressure pump.
  • such a high-pressure pump is used as a pump for delivering fluid for a storage injection system for internal combustion engines of motor vehicles.
  • Storage injection systems for internal combustion engines of motor vehicles should be able to provide the necessary volume flow and the required fluid pressure.
  • the high-pressure pump is subject to strong loads in memory injection systems for motor vehicles, in particular mechanical stresses. In particular, large forces must be able to be absorbed by such high-pressure pumps. Thus, both high demands are placed on the materials that make up the components of the high pressure pump, as well as the construction of the high pressure pump.
  • the object of the invention is to provide a high-pressure pump, which allows reliable and precise operation even at high pump pressures and thereby subject to the lowest possible wear. At the same time, the high-pressure pump should be inexpensive to produce.
  • the object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.
  • the invention is characterized by a high-pressure pump for conveying a fluid, which has a cylinder housing in which a pressurized space designed to pressurize the fluid with high pressure and a discharge line hydraulically coupled to the pressure chamber are arranged, and an outlet valve arranged in the discharge line a closing body and a sealing seat formed in the cylinder housing, wherein the outlet valve, depending on the pressure, releases or prevents fluid flow from the pressure chamber in the direction downstream of the outlet valve.
  • a pressure relief valve hydraulically coupled to the drain line and configured to limit the fluid pressure in the drain line downstream of the seal seat.
  • the fluid flow in an operating region of the outlet valve is released from the pressure chamber in the direction downstream of the outlet valve and in a further operating region of the outlet valve, the fluid flow is prevented by abutment of the closing body on the sealing seat, ie blocked.
  • the term fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.
  • Such a high-pressure pump has the advantage that a compact construction is possible by forming the pressure-limiting valve integrated in the high-pressure pump.
  • a small space and a structurally simple construction of the high-pressure pump are possible. Due to a small number of tion surfaces, it is possible that the leakage losses, in particular the pressure relief valve are only small.
  • the high-pressure pump has a pump housing in which the cylinder housing is arranged. Downstream of the pressure limiting valve, a return line is formed, which is arranged in the cylinder housing and / or the pump housing.
  • Pump housing and cylinder housing can be formed separately from each other. In principle, however, the pump housing and cylinder housing can also be formed in one piece.
  • Such an arrangement of the return line in the cylinder housing and / or the pump housing has the advantage that a leakage fluid can be returned within the high-pressure pump, for example, to a suction side of the high pressure pump, without special precautions must be taken to seal the return line.
  • Figure 1 is a block diagram of an injection system for an internal combustion engine
  • Figure 2 is a schematic view of a portion of a high-pressure pump with a pump cylinder in a longitudinal section.
  • the prefeed pump 2 is designed with preference as a vane pump. However, it can also be another type of pump, z. Legs Gear pump or gerotor pump are used here.
  • the prefeed pump 2 is hydraulically coupled downstream with a suction side of a high-pressure pump 4. On a
  • the high-pressure pump 4 can preferably be designed as a radial piston pump or as a series piston pump with a plurality of cylinder units, as are known for use in injection systems of internal combustion engines.
  • the fuel storage 6 is hydraulically coupled to an injector 8 or more injectors 8.
  • Each of the injectors 8 is assigned a combustion chamber of the internal combustion engine and each can be controlled so that fuel is injected into the combustion chamber.
  • the high pressure pump 4 the fuel to be injected by means of the injectors 8 in the combustion chambers of the internal combustion engine, reach a high injection pressure.
  • FIG. 2 shows the high-pressure pump 4 for conveying a fluid.
  • the fluid may be both a liquid and a gas.
  • the fluid is a fuel.
  • the high-pressure pump 4 has a pump housing 12 and a pump unit 13 with a cylinder housing 14.
  • the high-pressure pump 4 may have one pump unit 13 or a plurality of pump units 13.
  • the cylinder housing 14 is coupled to the pump housing 12.
  • the pump housing 12 is preferably formed of a metal.
  • the cylinder housing 14 is formed separately from the pump housing 12 in the illustrated embodiment, but the pump housing 12 and the cylinder housing 14 can also be made in one piece.
  • a high-pressure piston 16 is movably mounted in the direction of a longitudinal axis A of the cylinder housing 14. At one end of the high pressure piston 16 is a pressure chamber 18. At a further end of the high pressure piston 16, for example, a drive shaft and an eccentric portion of the high pressure pump 4 may be arranged.
  • the cylinder housing 14, the pressure chamber 18 and the high-pressure piston 16 of the pump unit 13 are arranged coaxially with one another.
  • the cylinder housing 14 is formed of a metal, preferably a steel.
  • an inlet valve 24 is preferably arranged in the supply line 20.
  • the inlet valve 24 facilitates the filling of the pressure chamber 18 and prevents the backflow of the fluid from the feed line 20 during filling.
  • the pressure chamber 18 faces Furthermore, a drain line 22 with an enlarged recess 25 with a longitudinal axis L.
  • an outlet valve 26 is arranged in the enlarged recess 25. Fluid can be expelled from the pressure chamber 18 in a first flow direction F1 of the fluid via the outlet valve 26. If the fluid is a fuel, the fuel can be ejected from the pressure chamber 18 in the first flow direction F1 toward the fuel reservoir 6 (FIG. 1).
  • a valve spring 38 and a closing body 40 are arranged in the enlarged recess 25 of the cylinder housing 14.
  • a sealing seat 42 is formed, on which the closing body 40 can rest.
  • the valve spring 38 biases the closing body 40 in the direction of the longitudinal axis L of the widened recess 25 by being supported on a wall of the widened recess 25.
  • a transverse bore 46 is formed in the closing body 40, which is hydraulically coupled to a connecting channel 48 formed in the cylinder housing 14.
  • the pressure limiting valve 10 is arranged in the cylinder housing 14 and hydraulically coupled via the connecting channel 48 to the drain line 22. Via the pressure limiting valve 10, fluid can flow from the drain line 22 via the transverse bore 46 and the connecting channel 48 in a second flow direction F2 into the return line 11.
  • the high pressure piston 16 is first, for example, by means of the drive shaft and the Exzenterabsacrificings the high pressure pump 4 is moved away from the inlet valve 24 in the direction of the longitudinal axis A of the cylinder housing 14.
  • the inlet valve 24 opens, and the pressure chamber 18 is filled with fluid.
  • the high-pressure pump 4 is, for example, a high-pressure fuel pump of an injection system of an internal combustion engine
  • the fuel subjected to high pressure can reach the fuel reservoir 6 via the drain line 22 and the outlet valve 26 in the first flow direction F1 of the fuel.
  • the fuel pressure required for the fuel storage 6 is determined by the pressure relief valve 10. If the pressure in the fuel reservoir 6 and therefore also in the drain line 22 increases too much or should the pressure in the fuel reservoir 6 and in the drain line 22 be purposefully reduced, the pressure relief valve 10 opens and fuel can flow from the fuel reservoir 6 and the drain line 22 via the transverse bore 46, the connecting channel 48 and arranged in the pump housing 12 and the cylinder housing 14 return line 11 flow out in the second flow direction F2 and are returned to the suction side of the high pressure pump 4.
  • the pressure relief valve 10 Due to the integration of the pressure relief valve 10 in the high-pressure pump 4, a compact design of the high-pressure pump 4 with a small space for the injection system is possible. In addition, the number of sealing surfaces can be very small so that the leakage losses of the pressure relief valve 10 and the return line 11 can be very small, since in particular a guided outside the high-pressure pump 4 return line can be avoided.

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

Abstract

The invention relates to a high pressure pump (4) for feeding a fluid, comprising at least one pump unit (13). The pump unit (13) comprises a cylinder housing (14) in which are disposed a pressure chamber (18) adapted to impart high pressure to the fluid and a discharge line (22) hydraulically coupled to the pressure chamber (18), and comprises an outlet valve (26) disposed in the discharge line (22), said valve having a closure member (40) and a sealing seat (42) made in the cylinder housing (14). The outlet valve (26) releases or suppresses a fluid stream from the pressure chamber (18) in the direction downstream of the outlet valve (26) as a function of the pressure. Disposed in the cylinder housing (14) downstream of the sealing seat (42) is a pressure limiting valve (10) that is hydraulically coupled to the discharge line (22), said value being adapted to limit the fluid pressure in the discharge line (22) downstream of the sealing seat (42).

Description

Beschreibungdescription
Hochdruckpumpehigh pressure pump
Die Erfindung betrifft eine Hochdruckpumpe.The invention relates to a high-pressure pump.
Vorzugsweise wird eine derartige Hochdruckpumpe als Förderpumpe zur Förderung von Fluid für ein Speichereinspritzsystem für Brennkraftmaschinen von Kraftfahrzeugen verwendet.Preferably, such a high-pressure pump is used as a pump for delivering fluid for a storage injection system for internal combustion engines of motor vehicles.
Speichereinspritzsysteme für Brennkraftmaschinen von Kraftfahrzeugen, beispielsweise in Common-Rail-Systemen, sollen den notwendigen Volumenstrom und den erforderlichen FIu- iddruck bereitstellen können. Die Hochdruckpumpe unterliegt in Speichereinspritzsystemen für Kraftfahrzeuge starken Belastungen, insbesondere mechanischen Beanspruchungen. Insbesondere müssen von derartigen Hockdruckpumpen große Kräfte aufgenommen werden können. Damit werden sowohl hohe Anforderungen an die Materialien, aus denen die Komponenten der Hochdruckpumpe bestehen, als auch an die Konstruktion der Hockdruckpumpe gestellt.Storage injection systems for internal combustion engines of motor vehicles, for example in common-rail systems, should be able to provide the necessary volume flow and the required fluid pressure. The high-pressure pump is subject to strong loads in memory injection systems for motor vehicles, in particular mechanical stresses. In particular, large forces must be able to be absorbed by such high-pressure pumps. Thus, both high demands are placed on the materials that make up the components of the high pressure pump, as well as the construction of the high pressure pump.
Da Hochdruckpumpen Drücken von beispielsweise bis zu 2000 bar oder mehr ausgesetzt sind, müssen sie hohen Beanspruchungen standhalten.Since high pressure pumps are exposed to pressures of, for example, up to 2000 bar or more, they must withstand high stresses.
Die Aufgabe der Erfindung ist es, eine Hochdruckpumpe zu schaffen, die auch bei hohen Pumpendrücken einen zuverlässigen und präzisen Betrieb ermöglicht und dabei einem möglichst geringen Verschleiß unterliegt. Zugleich soll die Hochdruckpumpe kostengünstig herstellbar sein. Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Ansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The object of the invention is to provide a high-pressure pump, which allows reliable and precise operation even at high pump pressures and thereby subject to the lowest possible wear. At the same time, the high-pressure pump should be inexpensive to produce. The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.
Die Erfindung zeichnet sich aus durch eine Hochdruckpumpe zur Förderung eines Fluids, die aufweist ein Zylindergehäuse, in dem ein zum Beaufschlagen des Fluids mit Hochdruck ausgebildeter Druckraum und eine mit dem Druckraum hydraulisch gekoppelte Ablaufleitung angeordnet sind, und ein in der Ablauf- leitung angeordnetes Auslassventil mit einem Schließkörper und einem in dem Zylindergehäuse ausgebildeten Dichtsitz, wobei das Auslassventil druckabhängig einen Fluidstrom von dem Druckraum in Richtung stromabwärts des Auslassventils freigibt beziehungsweise unterbindet. In dem Zylindergehäuse ist stromabwärts des Dichtsitzes ein hydraulisch mit der Ablaufleitung gekoppeltes Druckbegrenzungsventil angeordnet, das zum Begrenzen des Fluiddrucks in der Ablaufleitung stromabwärts des Dichtsitzes ausgebildet ist.The invention is characterized by a high-pressure pump for conveying a fluid, which has a cylinder housing in which a pressurized space designed to pressurize the fluid with high pressure and a discharge line hydraulically coupled to the pressure chamber are arranged, and an outlet valve arranged in the discharge line a closing body and a sealing seat formed in the cylinder housing, wherein the outlet valve, depending on the pressure, releases or prevents fluid flow from the pressure chamber in the direction downstream of the outlet valve. Disposed in the cylinder housing downstream of the seal seat is a pressure relief valve hydraulically coupled to the drain line and configured to limit the fluid pressure in the drain line downstream of the seal seat.
Druckabhängig wird in einem Betriebsbereich des Auslassventils der Fluidstrom von dem Druckraum in Richtung stromabwärts des Auslassventils freigegeben und in einem weiteren Betriebsbereich des Auslassventils der Fluidstrom durch Anliegen des Schließkörpers an dem Dichtsitz unterbunden, also gesperrt. Der Begriff Fluid ist hier in seinem weiteren Sinne zu verstehen, das Fluid kann also sowohl eine Flüssigkeit als auch ein Gas sein.Depending on the pressure, the fluid flow in an operating region of the outlet valve is released from the pressure chamber in the direction downstream of the outlet valve and in a further operating region of the outlet valve, the fluid flow is prevented by abutment of the closing body on the sealing seat, ie blocked. The term fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.
Eine derartige Hochdruckpumpe hat den Vorteil, dass ein kom- pakter Aufbau durch Ausbildung des in die Hochdruckpumpe integrierten Druckbegrenzungsventils möglich ist. Damit sind ein kleiner Bauraum und ein konstruktiv einfacher Aufbau der Hochdruckpumpe möglich. Durch eine geringe Zahl von Dich- tungsflachen ist es möglich, dass die Leckageverluste insbesondere des Druckbegrenzungsventils nur gering sind.Such a high-pressure pump has the advantage that a compact construction is possible by forming the pressure-limiting valve integrated in the high-pressure pump. Thus, a small space and a structurally simple construction of the high-pressure pump are possible. Due to a small number of tion surfaces, it is possible that the leakage losses, in particular the pressure relief valve are only small.
In einer vorteilhaften Ausführungsform weist die Hochdruck- pumpe ein Pumpengehäuse auf, in dem das Zylindergehäuse angeordnet ist. Stromabwärts des Druckbegrenzungsventils ist eine Rücklaufleitung ausgebildet, die in dem Zylindergehäuse und/oder dem Pumpengehäuse angeordnet ist. Pumpengehäuse und Zylindergehäuse können separat voneinander ausgebildet sein. Grundsätzlich können Pumpengehäuse und Zylindergehäuse jedoch auch einstückig ausgebildet sein. Eine derartige Anordnung der Rücklaufleitung in dem Zylindergehäuse und/oder dem Pumpengehäuse hat den Vorteil, dass ein Leckagefluid innerhalb der Hochdruckpumpe beispielsweise auf eine Ansaugseite der Hochdruckpumpe zurückgeführt werden kann, ohne dass besondere Vorkehrungen zur Abdichtung der Rücklaufleitung getroffen werden müssen.In an advantageous embodiment, the high-pressure pump has a pump housing in which the cylinder housing is arranged. Downstream of the pressure limiting valve, a return line is formed, which is arranged in the cylinder housing and / or the pump housing. Pump housing and cylinder housing can be formed separately from each other. In principle, however, the pump housing and cylinder housing can also be formed in one piece. Such an arrangement of the return line in the cylinder housing and / or the pump housing has the advantage that a leakage fluid can be returned within the high-pressure pump, for example, to a suction side of the high pressure pump, without special precautions must be taken to seal the return line.
Vorteilhafte Ausgestaltungen der Erfindung sind nachfolgend anhand der schematischen Zeichnungen näher erläutert.Advantageous embodiments of the invention are explained below with reference to the schematic drawings.
Es zeigen:Show it:
Figur 1 ein Blockschaltbild einer Einspritzanlage für eine Brennkraftmaschine, undFigure 1 is a block diagram of an injection system for an internal combustion engine, and
Figur 2 eine schematische Ansicht eines Teils einer Hochdruckpumpe mit einem Pumpenzylinder in einem Längsschnitt.Figure 2 is a schematic view of a portion of a high-pressure pump with a pump cylinder in a longitudinal section.
Die in der Figur 1 dargestellte Einspritzanlage für eineThe injection system shown in Figure 1 for a
Brennkraftmaschine weist eine Vorförderpumpe 2 auf, mittels der aus einem Kraftstofftank Kraftstoff gefördert wird. Die Vorförderpumpe 2 ist mit Vorzug als Flügelzellenpumpe ausgeführt. Es kann jedoch auch eine andere Pumpenart, z. B. eine Zahnradpumpe oder eine Gerotorpumpe hierbei zum Einsatz kommen .Internal combustion engine has a prefeed pump 2, by means of which fuel is conveyed from a fuel tank. The prefeed pump 2 is designed with preference as a vane pump. However, it can also be another type of pump, z. Legs Gear pump or gerotor pump are used here.
Die Vorförderpumpe 2 ist stromabwärts mit einer Ansaugseite einer Hochdruckpumpe 4 hydraulisch gekoppelt. Auf einerThe prefeed pump 2 is hydraulically coupled downstream with a suction side of a high-pressure pump 4. On a
Druckseite der Hochdruckpumpe 4 ist diese mit einem KraftstoffSpeicher 6 hydraulisch gekoppelt und dient der Förderung des Kraftstoffs in den KraftstoffSpeicher 6. Der Kraftstoff- Speicher 6 wird auch als Common-Rail bezeichnet. Die Hoch- druckpumpe 4 kann vorzugsweise als Radialkolbenpumpe oder als Reihenkolbenpumpe mit mehreren Zylindereinheiten ausgebildet sein, wie sie zum Einsatz in Einspritzanlagen von Brennkraftmaschinen bekannt sind.Pressure side of the high-pressure pump 4, this is hydraulically coupled to a fuel reservoir 6 and serves to promote the fuel in the fuel reservoir 6. The fuel reservoir 6 is also referred to as a common rail. The high-pressure pump 4 can preferably be designed as a radial piston pump or as a series piston pump with a plurality of cylinder units, as are known for use in injection systems of internal combustion engines.
Der KraftstoffSpeicher 6 ist mit einem Injektor 8 oder mehreren Injektoren 8 hydraulisch gekoppelt. Jedem der Injektoren 8 ist ein Brennraum der Brennkraftmaschine zugeordnet und jeder kann so angesteuert werden, dass Kraftstoff in den Brennraum eingespritzt wird. Durch die Hochdruckpumpe 4 kann der Kraftstoff, der mittels der Injektoren 8 in die Brennräume der Brennkraftmaschine eingespritzt werden soll, einen hohen Einspritzdruck erreichen.The fuel storage 6 is hydraulically coupled to an injector 8 or more injectors 8. Each of the injectors 8 is assigned a combustion chamber of the internal combustion engine and each can be controlled so that fuel is injected into the combustion chamber. By the high pressure pump 4, the fuel to be injected by means of the injectors 8 in the combustion chambers of the internal combustion engine, reach a high injection pressure.
Auf der Druckseite der Hochdruckpumpe 4 ist diese hydraulisch mit einem Druckbegrenzungsventil 10 gekoppelt. Das Druckbegrenzungsventil 10 öffnet und schließt abhängig von einem Kraftstoffdruck im KraftstoffSpeicher 6. Bei Überschreiten eines vorgegebenen Kraftstoffdrucks in dem KraftstoffSpeicher 6 kann das Druckbegrenzungsventil 10 öffnen und ein Teil des von der Hochdruckpumpe 4 geförderten Kraftstoffs kann über eine Rücklaufleitung 11 zu der Ansaugseite der Hochdruckpumpe 4 zurückgeführt werden. Die Figur 2 zeigt die Hochdruckpumpe 4 zur Förderung eines Fluids. Das Fluid kann sowohl eine Flüssigkeit als auch ein Gas sein. Vorzugsweise ist das Fluid ein Kraftstoff. Die Hochdruckpumpe 4 hat ein Pumpengehäuse 12 und eine Pumpenein- heit 13 mit einem Zylindergehäuse 14. Die Hochdruckpumpe 4 kann die eine Pumpeneinheit 13 oder mehrere Pumpeneinheiten 13 aufweisen.On the pressure side of the high pressure pump 4, this is hydraulically coupled to a pressure limiting valve 10. The pressure limiting valve 10 opens and closes depending on a fuel pressure in the fuel reservoir 6. When a predetermined fuel pressure in the fuel reservoir 6 is exceeded, the pressure limiting valve 10 can open and part of the pumped by the high pressure pump 4 fuel can be returned via a return line 11 to the suction side of the high pressure pump 4 become. FIG. 2 shows the high-pressure pump 4 for conveying a fluid. The fluid may be both a liquid and a gas. Preferably, the fluid is a fuel. The high-pressure pump 4 has a pump housing 12 and a pump unit 13 with a cylinder housing 14. The high-pressure pump 4 may have one pump unit 13 or a plurality of pump units 13.
Das Zylindergehäuse 14 ist mit dem Pumpengehäuse 12 gekop- pelt. Das Pumpengehäuse 12 ist vorzugsweise aus einem Metall gebildet. Das Zylindergehäuse 14 ist in der dargestellten Ausführungsform von dem Pumpengehäuse 12 separat ausgebildet, Pumpengehäuse 12 und Zylindergehäuse 14 können jedoch auch einteilig ausgeführt sein.The cylinder housing 14 is coupled to the pump housing 12. The pump housing 12 is preferably formed of a metal. The cylinder housing 14 is formed separately from the pump housing 12 in the illustrated embodiment, but the pump housing 12 and the cylinder housing 14 can also be made in one piece.
In einer Bohrung in dem Zylindergehäuse 14 ist ein Hochdruckkolben 16 bewegbar in Richtung einer Längsachse A des Zylindergehäuses 14 gelagert. An einem Ende des Hochdruckkolbens 16 befindet sich ein Druckraum 18. An einem weiteren Ende des Hochdruckkolbens 16 können beispielsweise eine Antriebswelle und ein Exzenterabschnitt der Hochdruckpumpe 4 angeordnet sein .In a bore in the cylinder housing 14, a high-pressure piston 16 is movably mounted in the direction of a longitudinal axis A of the cylinder housing 14. At one end of the high pressure piston 16 is a pressure chamber 18. At a further end of the high pressure piston 16, for example, a drive shaft and an eccentric portion of the high pressure pump 4 may be arranged.
Das Zylindergehäuse 14, der Druckraum 18 und der Hochdruck- kolben 16 der Pumpeneinheit 13 sind zueinander koaxial angeordnet. Das Zylindergehäuse 14 ist aus einem Metall, vorzugsweise einem Stahl gebildet.The cylinder housing 14, the pressure chamber 18 and the high-pressure piston 16 of the pump unit 13 are arranged coaxially with one another. The cylinder housing 14 is formed of a metal, preferably a steel.
Um den Druckraum 18 mit Fluid befüllen zu können, ist dieser mit einer Zulaufleitung 20 hydraulisch gekoppelt. In der Zulaufleitung 20 ist vorzugsweise ein Einlassventil 24 angeordnet. Das Einlassventil 24 erleichtert die Befüllung des Druckraums 18 und verhindert beim Befüllen das Zurückströmen des Fluids aus der Zulaufleitung 20. Der Druckraum 18 weist weiter eine Ablaufleitung 22 mit einer erweiterten Ausnehmung 25 mit einer Längsachse L auf. In der erweiterten Ausnehmung 25 ist ein Auslassventil 26 angeordnet. Über das Auslassventil 26 kann Fluid aus dem Druckraum 18 in einer ersten Strö- mungsrichtung Fl des Fluids ausgestoßen werden. Ist das Fluid ein Kraftstoff, so kann der Kraftstoff aus dem Druckraum 18 in der ersten Strömungsrichtung Fl zu dem KraftstoffSpeicher 6 hin ausgestoßen werden (Figur 1) .In order to fill the pressure chamber 18 with fluid, this is hydraulically coupled to a supply line 20. In the supply line 20, an inlet valve 24 is preferably arranged. The inlet valve 24 facilitates the filling of the pressure chamber 18 and prevents the backflow of the fluid from the feed line 20 during filling. The pressure chamber 18 faces Furthermore, a drain line 22 with an enlarged recess 25 with a longitudinal axis L. In the enlarged recess 25, an outlet valve 26 is arranged. Fluid can be expelled from the pressure chamber 18 in a first flow direction F1 of the fluid via the outlet valve 26. If the fluid is a fuel, the fuel can be ejected from the pressure chamber 18 in the first flow direction F1 toward the fuel reservoir 6 (FIG. 1).
In der erweiterten Ausnehmung 25 sind eine Ventilfeder 38 und ein Schließkörper 40 angeordnet. In der erweiterten Ausnehmung 25 des Zylindergehäuses 14 ist ein Dichtsitz 42 ausgebildet, an dem der Schließkörper 40 anliegen kann. Die Ventilfeder 38 spannt den Schließkörper 40 in Richtung der Längsachse L der erweiterten Ausnehmung 25 vor, indem sie sich an einer Wand der erweiterten Ausnehmung 25 abstützt.In the enlarged recess 25, a valve spring 38 and a closing body 40 are arranged. In the enlarged recess 25 of the cylinder housing 14, a sealing seat 42 is formed, on which the closing body 40 can rest. The valve spring 38 biases the closing body 40 in the direction of the longitudinal axis L of the widened recess 25 by being supported on a wall of the widened recess 25.
Stromabwärts des Dichtsitzes 42 ist in dem Schließkörper 40 eine Querbohrung 46 ausgebildet, die hydraulisch mit einem in dem Zylindergehäuse 14 ausgebildeten Verbindungskanal 48 gekoppelt ist.Downstream of the sealing seat 42, a transverse bore 46 is formed in the closing body 40, which is hydraulically coupled to a connecting channel 48 formed in the cylinder housing 14.
Das Druckbegrenzungsventil 10 ist in dem Zylindergehäuse 14 angeordnet und über den Verbindungskanal 48 hydraulisch mit der Ablaufleitung 22 gekoppelt. Über das Druckbegrenzungsventil 10 kann Fluid von der Ablaufleitung 22 über die Querbohrung 46 und den Verbindungskanal 48 in einer zweiten Strömungsrichtung F2 in die Rücklaufleitung 11 strömen.The pressure limiting valve 10 is arranged in the cylinder housing 14 and hydraulically coupled via the connecting channel 48 to the drain line 22. Via the pressure limiting valve 10, fluid can flow from the drain line 22 via the transverse bore 46 and the connecting channel 48 in a second flow direction F2 into the return line 11.
Im Folgenden soll die Funktionsweise der Hochdruckpumpe 4 beschrieben werden:In the following, the mode of operation of the high-pressure pump 4 will be described:
Der Hochdruckkolben 16 wird zunächst beispielsweise mittels der Antriebswelle und des Exzenterabschnitts der Hochdruck- pumpe 4 von dem Einlassventil 24 in Richtung der Längsachse A des Zylindergehäuses 14 wegbewegt. Das Einlassventil 24 öffnet, und der Druckraum 18 wird mit Fluid befüllt. Durch eine weitere Bewegung des Hochdruckkolbens 16 in Richtung der Längsachse A des Zylindergehäuses 14 hin zu dem Einlassventil 24 beispielsweise mittels der Antriebswelle und des Exzenterabschnitts der Hochdruckpumpe 4 schließt das Einlassventil 24 und das in dem Druckraum 18 befindliche Fluid wird verdichtet .The high pressure piston 16 is first, for example, by means of the drive shaft and the Exzenterabschnitts the high pressure pump 4 is moved away from the inlet valve 24 in the direction of the longitudinal axis A of the cylinder housing 14. The inlet valve 24 opens, and the pressure chamber 18 is filled with fluid. By a further movement of the high pressure piston 16 in the direction of the longitudinal axis A of the cylinder housing 14 to the inlet valve 24, for example by means of the drive shaft and the eccentric portion of the high pressure pump 4 closes the inlet valve 24 and the fluid in the pressure chamber 18 is compressed.
Handelt es sich bei der Hochdruckpumpe 4 etwa um eine Kraft- stoffhochdruckpumpe einer Einspritzanlage einer Brennkraftmaschine, so kann der mit hohem Druck beaufschlagte Kraftstoff über die Ablaufleitung 22 und das Auslassventil 26 in der ersten Strömungsrichtung Fl des Kraftstoffs zu dem KraftstoffSpeicher 6 gelangen.If the high-pressure pump 4 is, for example, a high-pressure fuel pump of an injection system of an internal combustion engine, the fuel subjected to high pressure can reach the fuel reservoir 6 via the drain line 22 and the outlet valve 26 in the first flow direction F1 of the fuel.
Der für den KraftstoffSpeicher 6 erforderliche Kraftstoffdruck wird durch das Druckbegrenzungsventil 10 festgelegt. Steigt der Druck im KraftstoffSpeicher 6 und damit auch in der Ablaufleitung 22 zu stark an oder soll der Druck im KraftstoffSpeicher 6 und in der Ablaufleitung 22 gezielt verringert werden, so öffnet das Druckbegrenzungsventil 10 und Kraftstoff kann aus dem KraftstoffSpeicher 6 und der Ablauf- leitung 22 über die Querbohrung 46, den Verbindungskanal 48 und die in dem Pumpengehäuse 12 und dem Zylindergehäuse 14 angeordnete Rücklaufleitung 11 in der zweiten Strömungsrichtung F2 ausströmen und zu der Saugseite der Hochdruckpumpe 4 zurückgeführt werden.The fuel pressure required for the fuel storage 6 is determined by the pressure relief valve 10. If the pressure in the fuel reservoir 6 and therefore also in the drain line 22 increases too much or should the pressure in the fuel reservoir 6 and in the drain line 22 be purposefully reduced, the pressure relief valve 10 opens and fuel can flow from the fuel reservoir 6 and the drain line 22 via the transverse bore 46, the connecting channel 48 and arranged in the pump housing 12 and the cylinder housing 14 return line 11 flow out in the second flow direction F2 and are returned to the suction side of the high pressure pump 4.
Durch die Integration des Druckbegrenzungsventils 10 in der Hochdruckpumpe 4 ist ein kompakter Aufbau der Hochdruckpumpe 4 bei kleinem Bauraum für die Einspritzanlage möglich. Darüber hinaus kann die Zahl der Dichtungsflächen sehr klein sein, so dass die Leckageverluste des Druckbegrenzungsventils 10 und der Rücklaufleitung 11 sehr gering sein können, da insbesondere eine eigens außerhalb der Hochdruckpumpe 4 geführte Rücklaufleitung vermieden werden kann. Due to the integration of the pressure relief valve 10 in the high-pressure pump 4, a compact design of the high-pressure pump 4 with a small space for the injection system is possible. In addition, the number of sealing surfaces can be very small so that the leakage losses of the pressure relief valve 10 and the return line 11 can be very small, since in particular a guided outside the high-pressure pump 4 return line can be avoided.
Bezugs zeichenlisteReference sign list
2 Vorförderpumpe2 prefeed pump
4 Hochdruckpumpe 6 KraftstoffSpeicher4 high-pressure pump 6 fuel storage
8 Injektor8 injector
10 Druckbegrenzungsventil10 pressure relief valve
11 Rücklaufleitung11 return line
12 Pumpengehäuse 13 Pumpeneinheit12 pump housing 13 pump unit
14 Zylindergehäuse14 cylinder housing
16 Hochdruckkolben16 high pressure pistons
18 Druckraum18 pressure room
20 Zulaufleitung 22 Ablaufleitung20 supply line 22 drain line
24 Einlassventil24 inlet valve
25 erweiterte Ausnehmung25 extended recess
26 Auslassventil 38 Ventilfeder 40 Schließkörper26 outlet valve 38 valve spring 40 closing body
42 Dichtsitz42 sealing seat
46 Querbohrung46 cross bore
48 Verbindungskanal48 connection channel
Fl erste Strömungsrichtung des FluidsFl first flow direction of the fluid
F2 zweite Strömungsrichtung des FluidsF2 second flow direction of the fluid
A Längsachse des ZylindergehäusesA longitudinal axis of the cylinder housing
L Längsachse der erweiterten Ausnehmung L longitudinal axis of the enlarged recess

Claims

Patentansprüche claims
1. Hochdruckpumpe (4) zur Förderung eines Fluids, mit mindestens einer Pumpeneinheit (13), die aufweist - ein Zylindergehäuse (14), in dem ein zum Beaufschlagen des Fluids mit Hochdruck ausgebildeter Druckraum (18) und eine mit dem Druckraum (18) hydraulisch gekoppelte Ablaufleitung (22) angeordnet sind, und ein in der Ablaufleitung (22) angeordnetes Auslassventil (26) mit einem Schließkörper (40) und einem in dem Zylindergehäuse (14) ausgebildeten Dichtsitz (42), wobei das Auslassventil (26) druckabhängig einen Fluidstrom von dem Druckraum (18) in Richtung stromabwärts des Auslassventils (26) freigibt beziehungsweise unterbindet, und wobei in dem Zylindergehäuse (14) stromabwärts des Dichtsitzes (42) ein hydraulisch mit der Ablaufleitung (22) gekoppeltes Druckbegrenzungsventil (10) angeordnet ist, das zum Begrenzen des Fluiddrucks in der Ablaufleitung (22) stromabwärts des Dichtsitzes (42) ausgebildet ist.1. High-pressure pump (4) for conveying a fluid, having at least one pump unit (13), comprising - a cylinder housing (14) in which a pressure medium applied to pressurize the fluid with high pressure (18) and with the pressure chamber (18) hydraulically coupled drain line (22) are arranged, and in the drain line (22) arranged outlet valve (26) with a closing body (40) and in the cylinder housing (14) formed sealing seat (42), wherein the outlet valve (26) depending on the pressure Fluid flow from the pressure chamber (18) towards the downstream of the exhaust valve (26) releases or, and wherein in the cylinder housing (14) downstream of the sealing seat (42) is arranged a hydraulically with the drain line (22) coupled pressure relief valve (10) for limiting the fluid pressure in the drain line (22) is formed downstream of the sealing seat (42).
2. Hochdruckpumpe (4) nach Anspruch 1, wobei die Hochdruckpumpe (4) ein Pumpengehäuse (12) aufweist, in dem das Zylindergehäuse (14) angeordnet ist, und stromabwärts des Druckbegrenzungsventils (10) eine Rücklaufleitung (11) ausgebildet ist, die in dem Zylindergehäuse (14) und/oder dem Pumpengehäuse (12) angeordnet ist. 2. High-pressure pump (4) according to claim 1, wherein the high-pressure pump (4) comprises a pump housing (12) in which the cylinder housing (14) is arranged, and downstream of the pressure relief valve (10) is formed a return line (11) which in the cylinder housing (14) and / or the pump housing (12) is arranged.
PCT/EP2009/065351 2008-11-28 2009-11-18 High pressure pump WO2010060834A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012089371A1 (en) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Injection pump for a fuel injection system
CN113167202A (en) * 2018-12-13 2021-07-23 罗伯特·博世有限公司 High-pressure fuel pump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010064192A1 (en) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Pressure-switching valve for a fuel injection system of an internal combustion engine
DE102013220816A1 (en) 2013-10-15 2015-04-16 Continental Automotive Gmbh Pressure relief valve for a fuel injection system and fuel injection system
DE202019004525U1 (en) 2019-11-05 2021-02-10 Firedos Gmbh Admixing system for fire extinguishing systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2107801A (en) * 1981-10-21 1983-05-05 Orange Gmbh Fuel injection pump, especially for a diesel-powered internal- combustion engine
GB2269426A (en) * 1992-07-31 1994-02-09 Bosch Gmbh Robert Fuel injection pumps for internal combustion engines
EP1411238A1 (en) * 2002-10-15 2004-04-21 Robert Bosch Gmbh Pressure regulating valve for an injection system
EP1835169A2 (en) * 2002-05-24 2007-09-19 Hitachi, Ltd. High-pressure fuel pump
EP1898084A1 (en) * 2006-08-31 2008-03-12 Hitachi, Ltd. High-pressure fuel supply pump

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005033636A1 (en) * 2004-10-06 2006-04-20 Robert Bosch Gmbh Fuel system for an internal combustion engine
DE102005033634A1 (en) * 2005-07-19 2007-01-25 Robert Bosch Gmbh High-pressure fuel pump for a fuel injection system of an internal combustion engine
DE102006061570A1 (en) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Common-rail-type fuel system for internal-combustion engine of motor vehicle, has points defined by fuel volumes, where difference between volumes corresponds to value, around which volume is decreased from maximum- to ambient temperature

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2107801A (en) * 1981-10-21 1983-05-05 Orange Gmbh Fuel injection pump, especially for a diesel-powered internal- combustion engine
GB2269426A (en) * 1992-07-31 1994-02-09 Bosch Gmbh Robert Fuel injection pumps for internal combustion engines
EP1835169A2 (en) * 2002-05-24 2007-09-19 Hitachi, Ltd. High-pressure fuel pump
EP1411238A1 (en) * 2002-10-15 2004-04-21 Robert Bosch Gmbh Pressure regulating valve for an injection system
EP1898084A1 (en) * 2006-08-31 2008-03-12 Hitachi, Ltd. High-pressure fuel supply pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012089371A1 (en) * 2010-12-27 2012-07-05 Robert Bosch Gmbh Injection pump for a fuel injection system
CN113167202A (en) * 2018-12-13 2021-07-23 罗伯特·博世有限公司 High-pressure fuel pump

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