DE102010029257A1 - Injector for use with pressure booster, particularly for fuel injection system, has valve seat, over which pressure medium is discharged by controlling valve element in direction of low-pressure connection of pressure reducing valve - Google Patents
Injector for use with pressure booster, particularly for fuel injection system, has valve seat, over which pressure medium is discharged by controlling valve element in direction of low-pressure connection of pressure reducing valve Download PDFInfo
- Publication number
- DE102010029257A1 DE102010029257A1 DE201010029257 DE102010029257A DE102010029257A1 DE 102010029257 A1 DE102010029257 A1 DE 102010029257A1 DE 201010029257 DE201010029257 DE 201010029257 DE 102010029257 A DE102010029257 A DE 102010029257A DE 102010029257 A1 DE102010029257 A1 DE 102010029257A1
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- Germany
- Prior art keywords
- pressure
- valve
- injector
- injector according
- valve seat
- 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.)
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft einen Injektor mit einem Druckübersetzer nach dem Oberbegriff des Anspruchs 1.The invention relates to an injector with a pressure booster according to the preamble of claim 1.
Ein derartiger Injektor ist das der
Um die angesprochenen Druckspitzen zumindest abzuschwächen ist es daher bereits bekannt, den Rücklaufkanal im Druckübersetzer in Wirkverbindung mit einer Zahnradpumpe anzuordnen, die die Druckspitzen durch Absaugen des Kraftstoffs verhindern bzw. abmindern. Dadurch lassen sich mögliche Kavitationsschäden in Form von Kavitationserosion am Ventilsitz des Ventilglieds vermeiden. Der konstruktive und herstellungstechnische Aufwand des bekannten Injektors ist jedoch durch die zusätzliche Zahnradpumpe relativ hoch.In order to at least mitigate the mentioned pressure peaks, it is therefore already known to arrange the return passage in the pressure booster in operative connection with a gear pump, which prevent or reduce the pressure peaks by sucking off the fuel. This avoids possible cavitation damage in the form of cavitation erosion on the valve seat of the valve member. However, the design and manufacturing complexity of the known injector is relatively high due to the additional gear pump.
Offenbarung der ErfindungDisclosure of the invention
Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Injektor mit einem Druckübersetzer nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass auf eine Absaugung von Kraftstoff aus dem Strömungskanal mittels einer Pumpe, insbesondere mittels einer Zahnradpumpe, entweder vollständig verzichtet oder zumindest die erforderliche Saugleistung erheblich verringert werden kann. Diese Aufgabe wird mit einem Injektor mit den Merkmalen des Anspruchs 1 gelöst. Der Erfindung liegt dabei die Idee zugrunde, die beim Stand der Technik in Form einer Pumpe mit dem Strömungskanal in Wirkverbindung angeordnete Druckreduzierungseinrichtung in Form wenigstens einer Saugstrahlpumpe auszubilden. Eine derartige Saugstrahlpumpe ist mit relativ geringem konstruktivem Aufwand realisierbar, sodass sich der zusätzliche Aufwand durch eine separate Pumpe, insbesondere eine Zahnradpumpe, vermeiden lässt bzw. eine in ihrer Baugröße und somit Kosten deutlich reduzierte Pumpe einsetzen lässt.Based on the illustrated prior art, the present invention seeks to further develop an injector with a pressure booster according to the preamble of claim 1 such that on a suction of fuel from the flow channel by means of a pump, in particular by means of a gear pump, either completely omitted or at least the required suction power can be significantly reduced. This object is achieved with an injector having the features of claim 1. The invention is based on the idea of forming in the prior art in the form of a pump in operative connection with the flow channel pressure reducing device in the form of at least one suction jet pump. Such a suction jet pump can be realized with relatively little design effort, so that the additional effort by a separate pump, in particular a gear pump, can be avoided or can be used in their size and thus cost significantly reduced pump.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Injektors mit einem Druckübersetzer sind in den Unteransprüchen angegeben. In den Rahmen der Erfindung fallen sämtliche Kombinationen aus zumindest zwei von in den Ansprüchen, der Beschreibung und/oder den Figuren offenbarten Merkmalen.Advantageous developments of the injector according to the invention with a pressure booster are given in the dependent claims. All combinations of at least two of the features disclosed in the claims, the description and / or the figures fall within the scope of the invention.
Besonders vorteilhaft ist die Anordnung bzw. Ausbildung der Saugstrahlpumpe, wenn diese einen düsenartigen Auslass aufweist, der in Wirkverbindung mit einem Umlenkbereich für das Druckmittel im Strömungskanal angeordnet ist.Particularly advantageous is the arrangement or design of the suction jet pump, if this has a nozzle-like outlet, which is arranged in operative connection with a deflection region for the pressure medium in the flow channel.
Besonders einfach lässt sich die Funktion der Saugstrahlpumpe darstellen, wenn die Saugstrahlpumpe mit unter Hochdruck, insbesondere mit unter Raildruck, stehenden Druckmittel gekoppelt ist. Man nutzt somit das unter Raildruck stehende Druckmittel des Kraftstoffeinspritzsystems zum Betrieb der Saugstrahlpumpe aus, sodass keinerlei zusätzliche Einrichtungen zur Erzeugung eines unter Druck stehenden Druckmittels erforderlich sind.The function of the suction jet pump can be represented particularly simply if the suction jet pump is coupled with pressurized fluid under high pressure, in particular under rail pressure. Thus, the pressure medium of the fuel injection system that is under rail pressure is used to operate the ejector pump, so that no additional means for generating a pressurized pressure medium are required.
Je nach Auslegung der Saugstrahlpumpe bzw. der geometrischen Gegebenheiten des Druckübersetzers kann es darüber hinaus vorteilhaft sein, dass der Druckübersetzer zusätzlich eine mechanisch betriebene Saugeinrichtung, insbesondere eine Zahnradpumpe, umfasst. Eine derartige Saugeinrichtung unterstützt die Tätigkeit der Saugstrahlpumpe, sodass ein besonders sicherer bzw. kavitationsfreier Betrieb des Druckübersetzers des Injektors ermöglicht wird.Depending on the design of the suction jet pump or the geometric conditions of the pressure booster, it may also be advantageous that the pressure booster additionally comprises a mechanically operated suction device, in particular a gear pump. Such a suction device supports the activity of the suction jet pump, so that a particularly safe or cavitation-free operation of the pressure booster of the injector is made possible.
Ein besonders kompakter Aufbau der Saugstrahlpumpe lässt sich erzielen, wenn diese zumindest teilweise in einer im Gehäuse angeordneten Ventilplatte ausgebildet ist, in der auch der Ventilsitz angeordnet ist. Da die Ventilplatte zur Ausbildung des Ventilsitzes mechanisch bearbeitet wird, kann somit die Saugstrahlpumpe während der Fertigung des Ventilsitzes in der Ventilplatte ausgebildet werden.A particularly compact construction of the suction jet pump can be achieved if it is at least partially formed in a housing arranged in the valve plate in which the valve seat is arranged. Since the valve plate is machined to form the valve seat, thus, the suction jet pump can be formed during the manufacture of the valve seat in the valve plate.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnungen.Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
Diese zeigen in:These show in:
Gleiche Bauteile bzw. Bauteile mit gleicher Funktion sind in den Figuren mit identischen Bezugsziffern versehen.The same components or components with the same function are provided in the figures with identical reference numerals.
In der
Bezüglich des grundsätzlichen Aufbaus eines derartigen Injektors
Der Druckübersetzer
Der weitere Ventilsitz
Ein soweit beschriebener Injektor
In den
In den
Zur Unterstützung der Wirkung der beiden Saugstrahlpumpen
Das soweit beschriebene Injektor
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102005030220 A1 [0002, 0018] DE 102005030220 A1 [0002, 0018]
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010029257 DE102010029257A1 (en) | 2010-05-25 | 2010-05-25 | Injector for use with pressure booster, particularly for fuel injection system, has valve seat, over which pressure medium is discharged by controlling valve element in direction of low-pressure connection of pressure reducing valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010029257 DE102010029257A1 (en) | 2010-05-25 | 2010-05-25 | Injector for use with pressure booster, particularly for fuel injection system, has valve seat, over which pressure medium is discharged by controlling valve element in direction of low-pressure connection of pressure reducing valve |
Publications (1)
Publication Number | Publication Date |
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DE102010029257A1 true DE102010029257A1 (en) | 2011-12-01 |
Family
ID=44924671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE201010029257 Withdrawn DE102010029257A1 (en) | 2010-05-25 | 2010-05-25 | Injector for use with pressure booster, particularly for fuel injection system, has valve seat, over which pressure medium is discharged by controlling valve element in direction of low-pressure connection of pressure reducing valve |
Country Status (1)
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DE (1) | DE102010029257A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005030220A1 (en) | 2005-06-29 | 2007-01-04 | Robert Bosch Gmbh | Injector with switchable pressure intensifier |
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2010
- 2010-05-25 DE DE201010029257 patent/DE102010029257A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005030220A1 (en) | 2005-06-29 | 2007-01-04 | Robert Bosch Gmbh | Injector with switchable pressure intensifier |
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Legal Events
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |