DE10151885A1 - Fuel injection system has gear pump to supply fuel at medium pressure before booster - Google Patents

Fuel injection system has gear pump to supply fuel at medium pressure before booster

Info

Publication number
DE10151885A1
DE10151885A1 DE2001151885 DE10151885A DE10151885A1 DE 10151885 A1 DE10151885 A1 DE 10151885A1 DE 2001151885 DE2001151885 DE 2001151885 DE 10151885 A DE10151885 A DE 10151885A DE 10151885 A1 DE10151885 A1 DE 10151885A1
Authority
DE
Germany
Prior art keywords
fuel
injection system
fuel injection
pressure
gear pump
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
DE2001151885
Other languages
German (de)
Inventor
Kurt Frank
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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 DE2001151885 priority Critical patent/DE10151885A1/en
Publication of DE10151885A1 publication Critical patent/DE10151885A1/en
Ceased legal-status Critical Current

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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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

Abstract

The fuel injection system (1) includes at least one pressure booster (3) to provide fuel at high pressure, and at least one injector (4) to inject the high-pressure fuel. A gear pump (2) is provided to supply fuel at medium pressure. This pump is fitted before the booster. It may be a multi-stage pump with an internal gear wheel.

Description

Stand der TechnikState of the art

Ein Kraftstoffeinspritzsystem mit einer Pumpe-Düse-Einheit ist beispielsweise durch die DE 199 63 370 A1 bekannt geworden. There is a fuel injection system with a unit injector become known, for example, from DE 199 63 370 A1.

Ein Kraftstoffeinspritzsystem mit einem Druckverstärker ist beispielsweise durch die DE 199 49 848 A1 bekannt geworden. A fuel injection system with a pressure booster is for example made known by DE 199 49 848 A1.

Ein Kraftstoffeinspritzsystem mit einem Common-Rail-Injektor ist beispielsweise durch die DE 199 42 990 A1 bekannt geworden. There is a fuel injection system with a common rail injector become known for example from DE 199 42 990 A1.

Nockengetriebene Kraftstoffeinspritzsysteme mit einer Pumpe-Düse-Einheit ermöglichen zwar die Erzeugung von Kraftstoff mit sehr hohe Drücken bis 2000 bar und darüber. Diese Kraftstoffeinspritzsysteme schränken aber die freie Wahl hinsichtlich der Gestaltung und der Variation der Voreinspritzung, Haupteinspritzung und Nacheinspritzung sehr ein. Cam-driven fuel injection systems with a unit injector enable the generation of fuel with very high pressures up to 2000 bar and above. But these fuel injection systems limit that free choice regarding the design and variation of the pre-injection, Main injection and post-injection very on.

Kraftstoffeinspritzsysteme mit einem Common-Rail-Injektor ermöglichen Freiheiten in der Wahl von Voreinspritzung, Haupteinspritzung und Nacheinspritzung. Die Einsatzfähigkeit der Systeme ist aber hinsichtlich der Hochdruckfestigkeit auf Grund der Vielzahl druckbeaufschlagter Bauteile auf geringere Drücke begrenzt (derzeit ca. 1300 bar). Höhere Drücke sind nur durch erhöhten Aufwand mit erhöhten Kosten realisierbar. Enable fuel injection systems with a common rail injector Freedom in the choice of pre-injection, main injection and Injection. The usability of the systems is however regarding High pressure resistance due to the large number of pressurized components lower pressures limited (currently approx. 1300 bar). Higher pressures are only realizable through increased effort with increased costs.

Vorteile der ErfindungAdvantages of the invention

Als kostengünstiges Kraftstoffeinspritzsystem zur Erzeugung von unter Hochdruck stehendem Kraftstoff schlägt die Erfindung ein Kraftstoffeinspritzsystem gemäß Patentanspruch 1 vor. Sinnvolle Weiterbildungen der Erfindung betreffen die Patentansprüche 2 bis 4. Das erfindungsgemäße Kraftstoffeinspritzsystem weist einem Kraftstoffeinspritzsystem mit Common-Rail-Injektor vergleichbare Freiheiten hinsichtlich der Gestaltung und Variation der Vor-, Haupt- und Nacheinspritzung auf. Die Festigkeit bei mittleren Drücken bis 2000 bar ist gewährleistet. Unter Hochdruck stehender Kraftstoff wird nur lokal vor oder im Injektor erzeugt. As an inexpensive fuel injection system for the generation of under High-pressure fuel strikes the invention Fuel injection system according to claim 1 before. meaningful Developments of the invention relate to claims 2 to 4. Das Fuel injection system according to the invention has one Fuel injection system with common rail injector comparable freedoms with regard to the design and variation of the preliminary, main and Post injection on. The strength is at medium pressures up to 2000 bar guaranteed. High-pressure fuel is only in front of or locally generated in the injector.

Zeichnungdrawing

Ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzsystems ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung der Zeichnung erläutert. Die Figur zeigt einen prinzipiellen Aufbau relevanter Teile des erfindungsgemäßen Kraftstoffeinspritzsystems. An embodiment of the fuel injection system according to the invention is shown in the drawing and is described in the description below the drawing explained. The figure shows a basic structure more relevant Parts of the fuel injection system according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Aus der Figur ist ersichtlich, dass ein Kraftstoffeinspritzsystem 1 eine an sich bekannte und daher nicht näher erläuterte Zahnradpumpe 2 umfasst. Diese Zahnradpumpe 2 dient dazu, Kraftstoff aus einem Vorratstank zu entnehmen und auf ein mittleres Druckniveau (MD) von ca. 200 bis 600 bar zu komprimieren. Kraftstoff unter einem solchen Druck wird anschließend einem Druckübersetzer 3 zugeführt und mit Hilfe des Druckübersetzers 3 unter Hochdruck (HD) gesetzt. Die Druckübersetzung kann - wie dargestellt - außerhalb eines Injektors stattfinden oder auch innerhalb des Injektors. In der Figur ist ein Injektor beispielhaft mit der Bezugsziffer 4 bezeichnet. Ebenso ist es denkbar, an Stelle der zentralen Druckübersetzung und der Kraftstoffverteilung über einen Verteiler 5 auch lokale Druckübersetzer vorzusehen. BEZUGSZEICHENLISTE 1 Kraftstoffeinspritzsystem
2 Zahnradpumpe
3 Druckübersetzer
4 Injektor
5 Verteiler
It can be seen from the figure that a fuel injection system 1 comprises a gear pump 2 known per se and therefore not explained in detail. This gear pump 2 is used to take fuel from a storage tank and to compress it to an average pressure level (MD) of approximately 200 to 600 bar. Fuel under such a pressure is then fed to a pressure booster 3 and is set under high pressure (HD) with the aid of the pressure booster 3 . As shown, the pressure translation can take place outside an injector or also within the injector. In the figure, an injector is identified by way of example with the reference number 4 . It is also conceivable to provide local pressure intensifiers instead of the central pressure intensifier and the fuel distribution via a distributor 5 . REFERENCE SIGN LIST 1 Fuel injection system
2 gear pump
3 pressure intensifiers
4 injector
5 distributors

Claims (4)

1. Kraftstoffeinspritzsystem (1) mit mindestens einem Druckverstärker (3) zur Erzeugung unter Hochdruck stehendem Kraftstoff und mit mindestens einem Injektor (4) zur Einspritzung von unter Hochdruck stehendem Kraftstoff, dadurch gekennzeichnet, dass eine Zahnradpumpe (2) zur Erzeugung unter mittlerem Druck stehendem Kraftstoff vorgesehen ist, welche dem Druckübersetzer (3) vorgeschaltet ist. 1. Fuel injection system ( 1 ) with at least one pressure booster ( 3 ) for the production of high-pressure fuel and with at least one injector ( 4 ) for the injection of high-pressure fuel, characterized in that a gear pump ( 2 ) for the production under medium pressure Fuel is provided, which is connected upstream of the pressure intensifier ( 3 ). 2. Kraftstoffeinspritzsystem nach Anspruch 1, dadurch gekennzeichnet, dass die Zahnradpumpe (2) mehrstufig ausgebildet ist. 2. Fuel injection system according to claim 1, characterized in that the gear pump ( 2 ) is designed in several stages. 3. Kraftstoffeinspritzsystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Zahnradpumpe (2) als Innenzahnrad ausgebildet ist. 3. Fuel injection system according to claim 1 or 2, characterized in that the gear pump ( 2 ) is designed as an internal gear. 4. Kraftstoffeinspritzsystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Druckverstärker (3) in den Injektor (4) integriert ist. 4. Fuel injection system according to one of the preceding claims, characterized in that the pressure booster ( 3 ) is integrated in the injector ( 4 ).
DE2001151885 2001-10-20 2001-10-20 Fuel injection system has gear pump to supply fuel at medium pressure before booster Ceased DE10151885A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2001151885 DE10151885A1 (en) 2001-10-20 2001-10-20 Fuel injection system has gear pump to supply fuel at medium pressure before booster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2001151885 DE10151885A1 (en) 2001-10-20 2001-10-20 Fuel injection system has gear pump to supply fuel at medium pressure before booster

Publications (1)

Publication Number Publication Date
DE10151885A1 true DE10151885A1 (en) 2003-05-08

Family

ID=7703195

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2001151885 Ceased DE10151885A1 (en) 2001-10-20 2001-10-20 Fuel injection system has gear pump to supply fuel at medium pressure before booster

Country Status (1)

Country Link
DE (1) DE10151885A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107220A1 (en) * 2007-03-05 2008-09-12 Robert Bosch Gmbh Fuel injection system and pressure boosting device for a fuel injection system
US7588012B2 (en) 2005-11-09 2009-09-15 Caterpillar Inc. Fuel system having variable injection pressure
EP2351927A1 (en) * 2010-01-12 2011-08-03 Robert Bosch GmbH Pressure boosting device for a fuel injection system and fuel injection system
US20120288381A1 (en) * 2007-07-26 2012-11-15 Suntec Industries France Modulating liquid pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3048347C2 (en) * 1980-12-20 1990-08-09 Volkswagen Ag
DE4038438A1 (en) * 1990-12-01 1992-06-04 Bosch Gmbh Robert Fuel delivery unit for vehicular internal combustion engine - has two pumps directly coupled by dovetail projections from hub into notched pinion without intermediate follower
DE19939422A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injection system for an internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3048347C2 (en) * 1980-12-20 1990-08-09 Volkswagen Ag
DE4038438A1 (en) * 1990-12-01 1992-06-04 Bosch Gmbh Robert Fuel delivery unit for vehicular internal combustion engine - has two pumps directly coupled by dovetail projections from hub into notched pinion without intermediate follower
DE19939422A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injection system for an internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588012B2 (en) 2005-11-09 2009-09-15 Caterpillar Inc. Fuel system having variable injection pressure
WO2008107220A1 (en) * 2007-03-05 2008-09-12 Robert Bosch Gmbh Fuel injection system and pressure boosting device for a fuel injection system
EP2402588A1 (en) * 2007-03-05 2012-01-04 Robert Bosch GmbH Fuel injection system
US20120288381A1 (en) * 2007-07-26 2012-11-15 Suntec Industries France Modulating liquid pump
EP2351927A1 (en) * 2010-01-12 2011-08-03 Robert Bosch GmbH Pressure boosting device for a fuel injection system and fuel injection system

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8131 Rejection