WO2020011429A1 - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
WO2020011429A1
WO2020011429A1 PCT/EP2019/062819 EP2019062819W WO2020011429A1 WO 2020011429 A1 WO2020011429 A1 WO 2020011429A1 EP 2019062819 W EP2019062819 W EP 2019062819W WO 2020011429 A1 WO2020011429 A1 WO 2020011429A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
fuel
low
connection
pressure
Prior art date
Application number
PCT/EP2019/062819
Other languages
German (de)
French (fr)
Inventor
Stefan Kolb
Florian Martin
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201980045674.4A priority Critical patent/CN112368474A/en
Priority to EP19725151.5A priority patent/EP3818261A1/en
Priority to KR1020217000334A priority patent/KR20210028642A/en
Publication of WO2020011429A1 publication Critical patent/WO2020011429A1/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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M59/025—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 a single piston
    • 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
    • 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
    • F02M59/44—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus

Definitions

  • the invention relates to a fuel pump according to the preamble of claim 1.
  • Fuel pumps are also known, for example, from EP 2 541 039 A1. Disclosure of the invention
  • the invention is based on the knowledge of the inventors that, in pumps with at least two low-pressure connections to these low-pressure connections, different functional requirements have to be made, for example, different depending on the application
  • first connection piece and the second connection piece are provided as parts which are identical to one another and which are fastened to the pump housing, and that in the second
  • the second low-pressure connection can be adapted to the specific application with little effort thanks to its modular structure.
  • the outlet is designed as a third connecting piece, which is identical to the first connecting piece and the second connecting piece.
  • the throttle part can for example be designed as a sleeve and
  • At least halve the flow cross-section of the second low-pressure connection ie reduce it to a value that is less than half the initial value.
  • the pump housing can consist of a pump body and a pump cover mounted on the pump body.
  • the first connection piece and the second connection piece can be fastened radially to the pump body.
  • Connecting piece is attached to the pump cover; or that the second
  • Connector is attached radially to the pump body and the first
  • Connection piece is attached to the pump cover.
  • Figure 1 is a schematic representation of a fuel system for a
  • Figure 2 shows a fuel pump according to the invention in an overall view
  • Figure 3 shows the pump of Figure 2 in a longitudinal section
  • Figure 4 shows the pump of Figure 2 in a longitudinal section perpendicular to Figure 3;
  • Figure 5 shows the second low pressure connection of the pump of Figure 2 in detail.
  • FIG. 1 shows a fuel system 10 for an internal combustion engine in a simplified schematic representation. From a fuel tank 12, fuel is supplied via a suction line 14, by means of a prefeed pump 16 Low-pressure line 18, via a first low-pressure connection 20 to a high-pressure fuel pump 28.
  • a fuel for example gasoline, is compressed to a high pressure in the high-pressure fuel pump 28 and fed via a high-pressure rail 32 and a high-pressure injector 34 to a combustion chamber 36 of the internal combustion engine, where it mixes with air supplied via an intake manifold 38 and subsequently, for example by means of a spark generated with a spark plug is ignited.
  • Low-pressure injector 37 into the above-mentioned intake manifold 38, where it already mixes with the supplied air before it reaches the combustion chamber 36 of the internal combustion engine.
  • Low-pressure connection 21 comes out of the high-pressure fuel pump 28, a flow of fuel through the high-pressure fuel pump 28 is ensured even if no compressed fuel is discharged via the outlet 90 of the high-pressure fuel pump.
  • the second low-pressure connection 21 can therefore also be referred to as the flushing connection of the high-pressure fuel pump 28.
  • the high-pressure fuel pump 28 is designed as a piston pump, wherein a piston 30 can be moved vertically in the drawing by means of a cam disk 31.
  • a first connection piece 80 which forms the first low-pressure connection 20, is fastened to the high-pressure fuel pump 28.
  • the fuel high-pressure pump 28 shown only schematically in FIG. 1 is shown in detail in different views in FIGS. 2 to 4.
  • the high-pressure fuel pump 28 shown as an example has one
  • Pump housing 40 which consists of a pump body 41 and a pump cover 42, for example, non-detachably mounted thereon.
  • the pump body 41 and the pump cover 42 can be connected to one another, for example, by means of a weld seam.
  • a first connection piece 80, a second connection piece 81, an outlet 90 in the form of a third connection piece 82 and a quantity control valve 46 are, for example, permanently attached to the side of the pump body 41.
  • the quantity control valve 46 has the function of a controllable inlet valve of the high-pressure fuel pump 28.
  • a fluidic connection between the low-pressure space 43 arranged below the pump cover 42 and the connecting piece 80 is established by a first connecting bore 51 running in the axial direction in the pump body 41.
  • a second connecting bore which also runs in the axial direction in the pump body 41, connects the low-pressure chamber 43 to the inlet side of the quantity control valve 46.
  • the quantity control valve 46 opens to the delivery space 44 or closes in the opposite direction.
  • the piston 30 is compressed by an upward movement of the medium and is conveyed via the outlet valve 48 opening away from the delivery chamber 44 and the outlet 90, for example, to a high-pressure rail 32.
  • a pressure relief valve 49 is connected antiparallel to the outlet valve 48 in order to prevent impermissibly high pressures in the high pressure region of the
  • a stepped space bore 53 connects the low-pressure space 43 to a compensation space 57 arranged below the pump body 41, which is delimited on its underside by a seal carrier 25 fastened to the pump body 41.
  • Connection piece 81 and the third connection piece 82 are identical parts, that is to say are produced in the same way.
  • a sleeve-shaped throttle part 75 is pressed into the second connecting piece 81, i.e. a throttle part 75 designed as a sleeve, the outer diameter 75A of which has an oversize in comparison to the inner diameter 811 of the second connecting piece 81, is introduced into the second connecting piece 81 and is at least frictionally fixed there.
  • the inner diameter 751 of the throttle part 75 can for example be half as large as an inner diameter of the second connecting piece 811 or even smaller.

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

Fuel pump (28) for a fuel system (10) for an internal combustion engine, wherein the fuel pump (28) has a delivery space (44) which is arranged in a pump housing (40) and delimited by a pump piston (30) which is displaceable in the axial direction, wherein the fuel pump (28) has an inlet valve (46) which opens from a low-pressure space (43) towards the delivery space (44), wherein the fuel pump (28) has an outlet valve (48) which opens away from the delivery space (44) in the direction of an outlet (90), wherein a first low-pressure connection (20) through which fuel can pass into the low-pressure space (43) and/or out of the low-pressure space (43) is provided on the pump housing (40), wherein, furthermore, a second low-pressure connection (21) through which fuel can pass into the low-pressure space (43) and/or out of the low-pressure space (43) is provided on the pump housing (40), wherein the first low-pressure connection (20) is designed as a first connection stub (80) provided on the pump housing (40), wherein the second low-pressure connection (21) is formed with a second connection stub (81) provided on the pump housing (40), characterized in that the first connection stub (80) and the second connection stub (81) are provided as parts which are structurally identical to one another and which are fastened to the pump housing (40), and in that a throttle part (75) is pressed into the second connection stub (81).

Description

Beschreibung  description
Titel title
Kraftstoffpumpe  Fuel pump
Stand der Technik State of the art
Die Erfindung geht aus von einer Kraftstoffpumpe gemäß dem Oberbegriff des Anspruchs 1. The invention relates to a fuel pump according to the preamble of claim 1.
Kraftstoffpumpen sind beispielsweise auch bekannt aus der EP 2 541 039 A1. Offenbarung der Erfindung Fuel pumps are also known, for example, from EP 2 541 039 A1. Disclosure of the invention
Die Erfindung beruht auf der Kenntnis der Erfinder, dass bei Pumpen mit mindestens zwei Niederdruckanschlüssen an diese Niederdruckanschlüsse voneinander verschiedene Funktionsanforderungen zu stellen sind, beispielsweise sind applikationsabhängig unterschiedliche The invention is based on the knowledge of the inventors that, in pumps with at least two low-pressure connections to these low-pressure connections, different functional requirements have to be made, for example, different depending on the application
Strömungsquerschnitte der Niederdruckanschlüsse gewünscht. Flow cross-sections of the low pressure connections required.
Es ist erfindungsgemäß vorgesehen, dass der erste Anschlussstutzen und der zweite Anschlussstutzen als zueinander baugleiche Teile vorgesehen sind, die an dem Pumpengehäuse befestigt sind, und dass in den zweiten It is provided according to the invention that the first connection piece and the second connection piece are provided as parts which are identical to one another and which are fastened to the pump housing, and that in the second
Anschlussstutzen ein Drosselteil eingepresst ist. Connection piece a throttle part is pressed.
Die Varianz der Anschlussstutzen ist auf diese Weise minimiert, wodurch die Fertigung der Kraftstoffpumpen vereinfacht wird. Überdies kann der zweite Niederdruckanschluss durch seinen modularen Aufbau mit geringem Aufwand applikationsspezifisch angepasst werden. The variance of the connecting pieces is minimized in this way, which simplifies the manufacture of the fuel pumps. Furthermore, the second low-pressure connection can be adapted to the specific application with little effort thanks to its modular structure.
Eine Weiterbildung der Erfindung sieht vor, dass der Auslass als ein dritter Anschlussstutzen ausgebildet ist, der zu dem ersten Anschlussstutzen und dem zweiten Anschlussstutzen baugleich ist. Das Drosselteil kann beispielsweise als Hülse ausgebildet sein und A further development of the invention provides that the outlet is designed as a third connecting piece, which is identical to the first connecting piece and the second connecting piece. The throttle part can for example be designed as a sleeve and
beispielsweise den Durchflussquerschnitt des zweiten Niederdruckanschlusses zumindest halbieren, also auf eine Wert reduzieren, der kleiner ist als der halbe Ausgangswert. For example, at least halve the flow cross-section of the second low-pressure connection, ie reduce it to a value that is less than half the initial value.
In Ausführungsformen kann das Pumpengehäuse aus einem Pumpenkörper und einem auf dem Pumpenkörper montierten Pumpendeckel bestehen. In dieser Bauweise können der erste Anschlussstutzen und der zweite Anschlussstutzen radial am Pumpenkörper befestigt sein. Alternativ ist es möglich, dass der erste Anschlussstutzen radial am Pumpenkörper befestigt ist und der zweite In embodiments, the pump housing can consist of a pump body and a pump cover mounted on the pump body. In this design, the first connection piece and the second connection piece can be fastened radially to the pump body. Alternatively, it is possible for the first connection piece to be fastened radially to the pump body and the second
Anschlussstutzen am Pumpendeckel befestigt ist; oder dass der zweite Connecting piece is attached to the pump cover; or that the second
Anschlussstutzen radial am Pumpenkörper befestigt ist und der erste Connector is attached radially to the pump body and the first
Anschlussstutzen am Pumpendeckel befestigt ist. Connection piece is attached to the pump cover.
Es kann vorteilhaft vorgesehen sein, dass in den ersten und/oder zweiten Anschlussstutzen weitere Bauteile eingepresst sind, beispielsweise Filter, Ventile und/oder Klappen. It can advantageously be provided that further components, for example filters, valves and / or flaps, are pressed into the first and / or second connecting piece.
Nachfolgend werden beispielhafte Ausführungsformen der Erfindung unter Bezugnahme auf die Zeichnung erläutert. In der Zeichnung zeigen: Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows:
Figur 1 eine schematische Darstellung eines Kraftstoffsystems für eine Figure 1 is a schematic representation of a fuel system for a
Brennkraftmaschine;  Internal combustion engine;
Figur 2 eine erfindungsgemäße Kraftstoffpumpe in einer Gesamtansicht; Figur 3 die Pumpe aus Figur 2 in einem Längsschnitt; Figure 2 shows a fuel pump according to the invention in an overall view; Figure 3 shows the pump of Figure 2 in a longitudinal section;
Figur 4 die Pumpe aus Figur 2 in einem Längsschnitt senkrecht zu Figur 3; Figur 5 den zweiten Niederdruckanschluss der Pumpe aus Figur 2 im Detail. Figure 4 shows the pump of Figure 2 in a longitudinal section perpendicular to Figure 3; Figure 5 shows the second low pressure connection of the pump of Figure 2 in detail.
Figur 1 zeigt ein Kraftstoffsystem 10 für eine Brennkraftmaschine in einer vereinfachten schematischen Darstellung. Aus einem Kraftstofftank 12 wird Kraftstoff über eine Saugleitung 14, mittels einer Vorförderpumpe 16, über eine Niederdruckleitung 18, über einen ersten Niederdruckanschluss 20 einer Kraftstoff-Hochdruckpumpe 28 zugeführt. Figure 1 shows a fuel system 10 for an internal combustion engine in a simplified schematic representation. From a fuel tank 12, fuel is supplied via a suction line 14, by means of a prefeed pump 16 Low-pressure line 18, via a first low-pressure connection 20 to a high-pressure fuel pump 28.
Ein Kraftstoff, beispielsweise Benzin, wird in der Kraftstoff-Hochdruckpumpe 28 auf einen hohen Druck verdichtet und über ein Hochdruckrail 32 und einen Hochdruckinjektor 34 einem Brennraum 36 der Brennkraftmaschine zugeführt, wo er mit über ein Saugrohr 38 zugeführter Luft vermischt und nachfolgend, beispielsweise durch einen mit einer Zündkerze erzeugten Funken, entzündet wird. A fuel, for example gasoline, is compressed to a high pressure in the high-pressure fuel pump 28 and fed via a high-pressure rail 32 and a high-pressure injector 34 to a combustion chamber 36 of the internal combustion engine, where it mixes with air supplied via an intake manifold 38 and subsequently, for example by means of a spark generated with a spark plug is ignited.
Anderseits gelangt bei Bedarf ein Teil des über den ersten Niederdruckanschluss 20 der Kraftstoff-Hochdruckpumpe 28 zugeführten Kraftstoffs nach einem Durchfluss durch die Kraftstoff-Hochdruckpumpe 28 ohne Verdichtung durch einen zweiten Niederdruckanschluss 21 wieder aus der Kraftstoff- Hochdruckpumpe 28 heraus und gelangt nachfolgend über einen On the other hand, if necessary, a portion of the fuel supplied to the high-pressure fuel pump 28 via the first low-pressure connection 20 comes out of the high-pressure fuel pump 28 again after flowing through the high-pressure fuel pump 28 without compression through a second low-pressure connection 21 and subsequently passes via a
Niederdruckinjektor 37 in das oben bereits erwähnte Saugrohr 38, wo es sich mit der zugeführten Luft bereits vermischt, bevor es in den Brennraum 36 der Brennkraftmaschine gelangt. Low-pressure injector 37 into the above-mentioned intake manifold 38, where it already mixes with the supplied air before it reaches the combustion chamber 36 of the internal combustion engine.
Durch den Teil des Kraftstoffs, der über den ersten Niederdruckanschluss 20 der Kraftstoff-Hochdruckpumpe 28 zugeführt wird und nach einem Durchfluss durch die Kraftstoff-Hochdruckpumpe 28 ohne Verdichtung durch den zweiten By the part of the fuel which is supplied to the high-pressure fuel pump 28 via the first low-pressure connection 20 and after a flow through the high-pressure fuel pump 28 without compression by the second
Niederdruckanschluss 21 wieder aus der Kraftstoff-Hochdruckpumpe 28 herausgelangt, ist ein Durchfluss von Kraftstoff durch die Kraftstoff- Hochdruckpumpe 28 auch dann sichergestellt, wenn kein verdichteter Kraftstoff über den Auslass 90 der Kraftstoff-Hochdruckpumpe ausgegeben wird. Der zweite Niederdruckanschluss 21 kann daher auch als Spülanschluss der Kraftstoff-Hochdruckpumpe 28 bezeichnet werden. Low-pressure connection 21 comes out of the high-pressure fuel pump 28, a flow of fuel through the high-pressure fuel pump 28 is ensured even if no compressed fuel is discharged via the outlet 90 of the high-pressure fuel pump. The second low-pressure connection 21 can therefore also be referred to as the flushing connection of the high-pressure fuel pump 28.
Die Kraftstoff-Hochdruckpumpe 28 ist als Kolbenpumpe ausgeführt, wobei ein Kolben 30 mittels einer Nockenscheibe 31 in der Zeichnung vertikal bewegt werden kann. The high-pressure fuel pump 28 is designed as a piston pump, wherein a piston 30 can be moved vertically in the drawing by means of a cam disk 31.
An der Kraftstoff-Hochdruckpumpe 28 ist ein erster Anschlussstutzen 80 befestigt, der den ersten Niederdruckanschluss 20 bildet. An der Kraftstoff- Hochdruckpumpe 28 ist ferner ein zweiter Anschlussstutzen 81 befestigt, auf dem der zweite Niederdruckanschluss 21 basiert. Die in der Figur 1 nur schematisch dargestellte Kraftstoff-Hochdruckpumpe 28 ist in den Figuren 2 bis 4 im Detail in verschiedenen Ansichten abgebildet. A first connection piece 80, which forms the first low-pressure connection 20, is fastened to the high-pressure fuel pump 28. A second connection piece 81, on which the second low-pressure connection 21 is based, is also fastened to the fuel high-pressure pump 28. The fuel high-pressure pump 28 shown only schematically in FIG. 1 is shown in detail in different views in FIGS. 2 to 4.
Die beispielhaft gezeigte Kraftstoff-Hochdruckpumpe 28 weist ein The high-pressure fuel pump 28 shown as an example has one
Pumpengehäuse 40 auf, das aus einem Pumpenkörper 41 und einem auf diesen beispielsweise unlösbar montierten Pumpendeckel 42 besteht. Der Pump housing 40, which consists of a pump body 41 and a pump cover 42, for example, non-detachably mounted thereon. The
Pumpenkörper 41 und der Pumpendeckel 42 können beispielsweise mittels einer Schweißnaht miteinander verbunden sein. The pump body 41 and the pump cover 42 can be connected to one another, for example, by means of a weld seam.
Seitlich an dem Pumpenkörper 41 sind ein erster Anschlussstutzen 80, ein zweiter Anschlussstutzen 81 , ein als dritter Anschlussstutzen 82 ausgebildeter Auslass 90 und ein Mengensteuerventil 46 beispielsweise unlösbar befestigt.A first connection piece 80, a second connection piece 81, an outlet 90 in the form of a third connection piece 82 and a quantity control valve 46 are, for example, permanently attached to the side of the pump body 41.
Das Mengensteuerventil 46 hat die Funktion eines ansteuerbaren Einlassventils der Kraftstoff-Hochdruckpumpe 28. The quantity control valve 46 has the function of a controllable inlet valve of the high-pressure fuel pump 28.
Eine fluidische Verbindung zwischen dem unterhalb des Pumpendeckel 42 angeordneten Niederdruckraum 43 und dem Anschlussstutzen 80 ist durch eine in axialer Richtung im Pumpenkörper 41 verlaufende erste Verbindungsbohrung 51 hergestellt. A fluidic connection between the low-pressure space 43 arranged below the pump cover 42 and the connecting piece 80 is established by a first connecting bore 51 running in the axial direction in the pump body 41.
Eine nicht abgebildete zweite Verbindungsbohrung die ebenfalls in axialer Richtung im Pumpenkörper 41 verläuft, verbindet den Niederdruckraum 43 mit der Einlassseite des Mengensteuerventils 46. A second connecting bore, not shown, which also runs in the axial direction in the pump body 41, connects the low-pressure chamber 43 to the inlet side of the quantity control valve 46.
Entsprechend den hydraulischen Druckverhältnissen und entsprechend der Ansteuerung öffnet das Mengensteuerventil 46 zum Förderraum 44 hin oder es schließt in die entgegengesetzte Richtung. In accordance with the hydraulic pressure conditions and in accordance with the control, the quantity control valve 46 opens to the delivery space 44 or closes in the opposite direction.
Durch eine Aufwärtsbewegung des Kolbens 30 wird das im Förderraum 44 befindliche Medium verdichtet und über das vom Förderraum 44 weg öffnende Auslassventil 48 und den Auslass 90 beispielsweise zu einem Hochdruckrail 32 gefördert. Antiparallel zum Auslassventil 48 ist ein Druckbegrenzungsventil 49 geschaltet, um unzulässig hohen Drücken im Hochdruckbereich des The piston 30 is compressed by an upward movement of the medium and is conveyed via the outlet valve 48 opening away from the delivery chamber 44 and the outlet 90, for example, to a high-pressure rail 32. A pressure relief valve 49 is connected antiparallel to the outlet valve 48 in order to prevent impermissibly high pressures in the high pressure region of the
Kraftstoffsystems 10 vorzubeugen. Eine Stufenraumbohrung 53 verbindet den Niederdruckraum 43 mit einem unterhalb des Pumpenkörpers 41 angeordneten Ausgleichsraum 57, der auf seiner Unterseite durch einen am Pumpenkörper 41 befestigten Dichtungsträger 25 begrenzt ist. To prevent fuel system 10. A stepped space bore 53 connects the low-pressure space 43 to a compensation space 57 arranged below the pump body 41, which is delimited on its underside by a seal carrier 25 fastened to the pump body 41.
Es ist vorgesehen, dass der erste Anschlussstutzen 80, der zweite It is provided that the first connection piece 80, the second
Anschlussstutzen 81 und der dritte Anschlussstutzen 82 baugleiche Teile sind, das heißt auf gleiche Weise hergestellt sind. Wie in Figur 5 ersichtlich ist, ist in den zweiten Anschlussstutzen 81 ein hülsenförmiges Drosselteil 75 eingepresst, d.h. ein als Hülse ausgebildetes Drosselteil 75, dessen Außendurchmesser 75A ein Übermaß im Vergleich zum Innendurchmesser 811 des zweiten Anschlussstutzen 81 aufweist, ist in den zweiten Anschlussstutzen 81 eingebracht und dort zumindest reibschlüssig fixiert. Connection piece 81 and the third connection piece 82 are identical parts, that is to say are produced in the same way. As can be seen in Figure 5, a sleeve-shaped throttle part 75 is pressed into the second connecting piece 81, i.e. a throttle part 75 designed as a sleeve, the outer diameter 75A of which has an oversize in comparison to the inner diameter 811 of the second connecting piece 81, is introduced into the second connecting piece 81 and is at least frictionally fixed there.
Der Innendurchmesser 751 des Drosselteils 75 kann beispielsweise halb so groß sein wie ein Innendurchmesser des zweiten Anschlussstutzens 811 oder noch kleiner. The inner diameter 751 of the throttle part 75 can for example be half as large as an inner diameter of the second connecting piece 811 or even smaller.

Claims

Ansprüche Expectations
1. Kraftstoffpumpe (28) für ein Kraftstoffsystem (10) für eine 1. Fuel pump (28) for a fuel system (10) for one
Brennkraftmaschine, wobei die Kraftstoffpumpe (28) einen in einem  Internal combustion engine, the fuel pump (28) being one in one
Pumpengehäuse (40) angeordneten und durch einen in axialer Richtung verschiebbaren Pumpenkolben (30) begrenzten Förderraum (44) aufweist, wobei die Kraftstoffpumpe (28) ein Einlassventil (46) aufweist, das von einem Niederdruckraum (43) zum Förderraum (44) hin öffnet, wobei die Kraftstoffpumpe (28) ein Auslassventil (48) aufweist, das vom Förderraum (44) weg in Richtung zu einem Auslass (90) hin öffnet, wobei an dem Pumpengehäuse (40) ein erster Niederdruckanschluss (20) vorgesehen ist, durch den Kraftstoff in den Niederdruckraum (43) hinein und/oder aus dem Niederdruckraum (43) heraus gelangen kann, wobei an dem  Pump housing (40) arranged and delimited by a pump piston (30) displaceable in the axial direction delivery chamber (44), the fuel pump (28) having an inlet valve (46) which opens from a low pressure chamber (43) to the delivery chamber (44) , The fuel pump (28) has an outlet valve (48) which opens away from the delivery space (44) towards an outlet (90), a first low pressure connection (20) being provided on the pump housing (40) through which Fuel can get into the low-pressure chamber (43) and / or out of the low-pressure chamber (43), with the
Pumpengehäuse (40) weiterhin ein zweiter Niederdruckanschluss (21 ) vorgesehen ist, durch den Kraftstoff in den Niederdruckraum (43) hinein und/oder aus dem Niederdruckraum (43) heraus gelangen kann, wobei der erste Niederdruckanschluss (20) als ein erster an dem Pumpengehäuse (40) vorgesehener Anschlussstutzen (80) ausgebildet ist, wobei der zweite Niederdruckanschluss (21 ) mit einem zweiten an dem Pumpengehäuse (40) vorgesehenen Anschlussstutzen (81 ) ausgebildet ist, dadurch  Pump housing (40) is further provided a second low pressure connection (21) through which fuel can get into and / or out of the low pressure chamber (43), the first low pressure connection (20) being the first on the pump housing (40) provided connecting piece (80), the second low-pressure connection (21) being formed with a second connecting piece (81) provided on the pump housing (40), thereby
gekennzeichnet, dass der erste Anschlussstutzen (80) und der zweite Anschlussstutzen (81 ) als zueinander baugleiche Teile vorgesehen sind, die an dem Pumpengehäuse (40) befestigt sind, und dass in den zweiten Anschlussstutzen (81 ) ein Drosselteil (75) eingepresst ist.  characterized in that the first connection piece (80) and the second connection piece (81) are provided as parts which are identical to one another and are fastened to the pump housing (40), and that a throttle part (75) is pressed into the second connection piece (81).
2. Kraftstoffpumpe nach Anspruch 1 dadurch gekennzeichnet, dass das 2. Fuel pump according to claim 1, characterized in that the
Pumpengehäuse (40) einen Pumpenkörper (41 ) und einen auf dem  Pump housing (40) a pump body (41) and one on the
Pumpenkörper (41 ) montierten Pumpendeckel (42) aufweist, sodass zwischen dem Pumpenkörper (41 ) und dem Pumpendeckel (42) der Niederdruckraum (43) ausgebildet ist, und dass der erste Anschlussstutzen (80) und der zweite Anschlussstutzen (81 ) radial am Pumpenkörper (41 ) befestigt sind. Has pump body (41) mounted pump cover (42), so that between the pump body (41) and the pump cover (42) the low pressure chamber (43) is formed, and that the first connection piece (80) and the second connection piece (81) radially on the pump body (41) are attached.
3. Kraftstoffpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass das Pumpengehäuse (40) einen Pumpenkörper (41 ) und einen auf dem 3. Fuel pump according to claim 1, characterized in that the pump housing (40) has a pump body (41) and one on the
Pumpenkörper (41 ) montierten Pumpendeckel (42) aufweist, sodass zwischen dem Pumpenkörper (41 ) und dem Pumpendeckel (42) der Niederdruckraum (43) ausgebildet ist, und dass der erste Anschlussstutzen (80) radial am Pumpenkörper (41 ) befestigt ist und der zweite  Has pump body (41) mounted pump cover (42), so that between the pump body (41) and the pump cover (42) the low pressure chamber (43) is formed, and that the first connection piece (80) is radially attached to the pump body (41) and the second
Anschlussstutzen (81 ) am Pumpendeckel (42) befestigt ist oder dass der zweite Anschlussstutzen (81 ) radial am Pumpenkörper (41 ) befestigt ist und der erste Anschlussstutzen (80) am Pumpendeckel (42) befestigt ist.  Connection piece (81) is attached to the pump cover (42) or that the second connection piece (81) is attached radially to the pump body (41) and the first connection piece (80) is attached to the pump cover (42).
4. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch 4. Fuel pump according to one of the preceding claims, characterized
gekennzeichnet, dass der Auslass (90) als ein dritter Anschlussstutzen (82) ausgebildet ist, der zu dem ersten Anschlussstutzen (80) und dem zweiten Anschlussstutzen (81 ) baugleich ist.  characterized in that the outlet (90) is designed as a third connection piece (82), which is identical to the first connection piece (80) and the second connection piece (81).
5. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch 5. Fuel pump according to one of the preceding claims, characterized
gekennzeichnet, dass die Anschlussstutzen (80, 81 , 82) an dem  characterized in that the connecting piece (80, 81, 82) on the
Pumpengehäuse (40) angeschweißt sind.  Pump housing (40) are welded on.
6. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch 6. Fuel pump according to one of the preceding claims, characterized
gekennzeichnet, dass das Drosselteil (75) den Durchflussquerschnitt (81 1) des zweiten Anschlussstutzens (81 ) um 50% oder mehr mindert.  characterized in that the throttle part (75) reduces the flow cross-section (81 1) of the second connecting piece (81) by 50% or more.
7. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch 7. Fuel pump according to one of the preceding claims, characterized
gekennzeichnet, dass das Drosselteil (75) als Hülse ausgebildet ist.  characterized in that the throttle part (75) is designed as a sleeve.
8. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch 8. Fuel pump according to one of the preceding claims, characterized
gekennzeichnet, dass in den zweiten Anschlussstutzen (81 ) weitere Bauteile eingepresst sind.  characterized in that further components are pressed into the second connecting piece (81).
PCT/EP2019/062819 2018-07-07 2019-05-17 Fuel pump WO2020011429A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201980045674.4A CN112368474A (en) 2018-07-07 2019-05-17 Fuel pump
EP19725151.5A EP3818261A1 (en) 2018-07-07 2019-05-17 Fuel pump
KR1020217000334A KR20210028642A (en) 2018-07-07 2019-05-17 Fuel pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018211237.1A DE102018211237A1 (en) 2018-07-07 2018-07-07 Fuel pump
DE102018211237.1 2018-07-07

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WO2020011429A1 true WO2020011429A1 (en) 2020-01-16

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CN (1) CN112368474A (en)
DE (1) DE102018211237A1 (en)
WO (1) WO2020011429A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102020208847A1 (en) 2020-07-15 2022-01-20 Robert Bosch Gesellschaft mit beschränkter Haftung High pressure fuel pump for a fuel injection system of an internal combustion engine
DE102020211798A1 (en) 2020-09-22 2022-03-24 Robert Bosch Gesellschaft mit beschränkter Haftung High pressure fuel pump for a fuel injection system of an internal combustion engine

Citations (5)

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US5035221A (en) * 1989-01-11 1991-07-30 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
DE10000981A1 (en) * 1999-01-13 2000-07-27 Toyota Motor Co Ltd Fluid pump with pump mechanism in casing, which includes first element where high pressure through passage is located and second element where it is not.
DE102009000857A1 (en) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Pump arrangement for use in fuel injection system of air-compressed, self-igniting internal combustion engine, has suction valve for filling pump operating chamber of pump component with diesel fuel from recess of housing
EP2541039A1 (en) 2010-02-26 2013-01-02 Hitachi Automotive Systems, Ltd. High pressure fuel pump
US20160025055A1 (en) * 2013-03-13 2016-01-28 Robert Bosch Gmbh Cylinder head blank, cylinder head and high-pressure pump for fuel injection systems

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DE102009003054A1 (en) * 2009-05-13 2010-11-18 Robert Bosch Gmbh high pressure pump
DE102015219415B4 (en) * 2015-10-07 2020-07-09 Vitesco Technologies GmbH High-pressure fuel pump and fuel supply device for an internal combustion engine, in particular a motor vehicle
JP6569480B2 (en) * 2015-11-05 2019-09-04 株式会社デンソー High pressure pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035221A (en) * 1989-01-11 1991-07-30 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
DE10000981A1 (en) * 1999-01-13 2000-07-27 Toyota Motor Co Ltd Fluid pump with pump mechanism in casing, which includes first element where high pressure through passage is located and second element where it is not.
DE102009000857A1 (en) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Pump arrangement for use in fuel injection system of air-compressed, self-igniting internal combustion engine, has suction valve for filling pump operating chamber of pump component with diesel fuel from recess of housing
EP2541039A1 (en) 2010-02-26 2013-01-02 Hitachi Automotive Systems, Ltd. High pressure fuel pump
US20160025055A1 (en) * 2013-03-13 2016-01-28 Robert Bosch Gmbh Cylinder head blank, cylinder head and high-pressure pump for fuel injection systems

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EP3818261A1 (en) 2021-05-12
CN112368474A (en) 2021-02-12
DE102018211237A1 (en) 2020-01-09

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