DE10242685A1 - Fuel injection valve for internal combustion engines comprises an annular groove between two conical surfaces which lies adjacent to both conical surfaces and has an upstream edge serving as a seat edge of a valve needle - Google Patents
Fuel injection valve for internal combustion engines comprises an annular groove between two conical surfaces which lies adjacent to both conical surfaces and has an upstream edge serving as a seat edge of a valve needle Download PDFInfo
- Publication number
- DE10242685A1 DE10242685A1 DE2002142685 DE10242685A DE10242685A1 DE 10242685 A1 DE10242685 A1 DE 10242685A1 DE 2002142685 DE2002142685 DE 2002142685 DE 10242685 A DE10242685 A DE 10242685A DE 10242685 A1 DE10242685 A1 DE 10242685A1
- Authority
- DE
- Germany
- Prior art keywords
- valve
- valve needle
- fuel injection
- channel
- conical surface
- 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.)
- Withdrawn
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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/042—The valves being provided with fuel passages
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
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
Description
Die Erfindung geht von einem Kraftstoffeinspritzventil aus, wie es der Gattung des Patentanspruchs 1 entspricht. Aus der WO 96/19661 ist ein solches Kraftstoffeinspritzventil bekannt, das einen Ventilkörper mit einer darin ausgebildeten Bohrung aufweist. Am brennraumseitigen Ende der Bohrung ist ein konischer Ventilsitz ausgebildet, und es befindet sich dort wenigstens eine Einspritzöffnung, durch die der Ventilsitz mit dem Brennraum der Brennkraftmaschine verbunden ist. In der Bohrung ist eine kolbenförmige Ventilnadel längsverschiebbar angeordnet, die mit dem Ventilsitz so zur Steuerung der wenigstens einen Einspritzöffnung zusammenwirkt, dass bei Anlage der Ventilnadel auf dem Ventilsitz die Einspritzöffnungen verschlossen werden, während bei vom Ventilsitz abgehobener Ventilnadel Kraftstoff aus einem Druckraum den Einspritzöffnungen zufließen kann. Das brennraumseitige Ende der Ventilnadel weist zwei Konusflächen auf, wobei die erste Konusfläche einen Öffnungswinkel aufweist, der kleiner ist als der Öffnungswinkel des Ventilsitzes. Stromabwärts der ersten Konusfläche ist an der Ventilnadel eine zweite Konusfläche ausgebildet, die einen Öffnungswinkel aufweist, der größer als der Öffnungswinkel des Ventilsitzes ist. Darüber hinaus ist zwischen den beiden Konusflächen eine Ringnut ausgebildet, deren bezüglich des Kraftstoffstroms zu den Einspritzöffnungen stromaufwärts gelegene Kante, die an die erste Konusfläche grenzt, bei Anlage der Ventilnadel am Ventilsitz als Dichtkante dient.The invention relates to a fuel injection valve from how it corresponds to the type of claim 1. From the Such a fuel injection valve is known from WO 96/19661 a valve body having a bore formed therein. On the combustion chamber side A conical valve seat is formed at the end of the bore, and it there is at least one injection opening through which the valve seat is connected to the combustion chamber of the internal combustion engine. In the hole is a piston-shaped Valve needle can be moved lengthways arranged with the valve seat so to control the at least an injection port interacts that when the valve needle is placed on the valve seat the injection ports be closed while at Valve needle lifted from the valve seat from a pressure chamber the injection ports flow into can. The end of the valve needle on the combustion chamber side has two conical surfaces, being the first conical surface an opening angle has that is smaller than the opening angle of the valve seat. downstream the first conical surface a second conical surface is formed on the valve needle, which has an opening angle which is greater than the opening angle of the valve seat. About that In addition, an annular groove is formed between the two conical surfaces, their regarding of the fuel flow to the injection ports upstream Edge leading to the first cone surface limits when the valve needle is placed on the valve seat as a sealing edge serves.
Das bekannte Kraftstoffeinspritzventil weist hierbei jedoch den Nachteil auf, dass sich der Öffnungsdruck, also der Kraftstoffdruck, bei dem die Ventilnadel eine genügend große, hydraulische Kraft erfährt, um gegen eine Schließkraft vom Ventilsitz abzuheben, mit der Lebensdauer des Kraftstoffeinspritzventils ändert. Bei einem neuen Kraftstoffeinspritzventil strömt zu Beginn der Öffnungshubbewegung, wenn die Ventilnadel erst einen kleinen Hub durchfahren hat, Kraftstoff an der Dichtkante vorbei in die Ringnut. Da ein Weiterfließen an der stromabwärts gelegenen Kante der Ringnut vorbei zu den Einspritzöffnungen ohne weiteres möglich ist, kommt es in der Ringnut zu keinem nennenswerten Druckanstieg und damit zu keiner zusätzlichen hydraulischen Kraft auf die Ventilnadel. Im Laufe der Lebensdauer des Kraftstoffeinspritzventils wird die Dichtkante etwas in den Ventilsitz eingehämmert, so dass sich auch die stromabwärtige Kante der Ringnut näher am Ventilsitz befindet und schließlich sogar in Schließstellung der Ventilnadel am Ventilsitz aufliegt. Beim Öffnen der Ventilnadel strömt nun, sobald die Dichtkante vom Ventilsitz abgehoben hat, Kraftstoff in die Ringnut, kann von dort aber nur gedrosselt an der stromabwärtigen Kante der Ringnut vorbei zu den Einspritzöffnungen weiterfließen. Es kommt deshalb zu einem Druckanstieg in der Ringnut und damit zu einer zusätzlichen Öffnungskraft auf die Ventilnadel. Erst bei vollem Hub der Ventilnadel kann der Kraftstoff nahezu ungedrosselt den Einspritzöffnungen zufließen. Durch diese zusätzliche Öffnungskraft wird der Öffnungsdruck abgesenkt und die Öffnungsdynamik der Ventilnadel ändert sich. Hierdurch wird es erschwert, weiterhin eine präzise Einspritzung von Menge und Zeitpunkt vorzunehmen, was bei modernen, schnelllaufenden Brennkraftmaschinen unerlässlich ist.The well-known fuel injector has the disadvantage, however, that the opening pressure, So the fuel pressure at which the valve needle has a sufficiently large hydraulic Experiencing strength around against a closing force lift off the valve seat changes with the life of the fuel injector. at a new fuel injector flows at the beginning of the opening stroke movement, if the valve needle has just passed a short stroke, fuel past the sealing edge into the ring groove. Since a flow continues on the downstream edge of the ring groove past to the injection openings easily possible there is no significant pressure increase in the ring groove and therefore no additional hydraulic force on the valve needle. Over the lifetime of the fuel injector, the sealing edge is slightly in the Hammered valve seat, so that the downstream Edge of the ring groove closer located on the valve seat and finally even in the closed position the valve needle rests on the valve seat. When the valve needle is opened, As soon as the sealing edge has lifted off the valve seat, fuel into the Ring groove, but can only be throttled from there on the downstream edge continue to flow past the ring groove to the injection openings. It therefore there is an increase in pressure in the annular groove and thus one additional opening force on the valve needle. Only when the valve needle is fully lifted can the Flow fuel almost unthrottled into the injection openings. By this additional opening force becomes the opening pressure lowered and the opening dynamics the valve needle changes yourself. This makes it difficult to continue precise injection of quantity and timing to make what modern, fast-moving Internal combustion engines essential is.
Aus der
Das erfindungsgemäße Kraftstoffeinspritzventil mit den kennzeichnenden Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass die Öffnungsdynamik des Kraftstoffeinspritzventils während der gesamten Lebensdauer konstant bleibt. Durch einen in der Ventilnadel verlaufenden Kanal ist die Ringnut mit der Außenfläche der Ventilnadel stromabwärts der Ringnut verbunden, so dass ein sich in der Ringnut aufbauender Druck über diesen Kanal abgeführt wird. Hierdurch bleibt die Öffnungsdynamik des Einspritzventils stets dieselbe.The fuel injection valve according to the invention with the characterizing features of claim 1, in contrast, the Advantage on that opening dynamics the fuel injector during remains constant throughout the entire service life. Through one in the valve pin extending channel is the annular groove with the outer surface of the valve needle downstream of the Ring groove connected, so that a pressure builds up in the ring groove over this Channel discharged becomes. This keeps the opening dynamics of the injection valve always the same.
Durch die Unteransprüche sind vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung möglich.Through the subclaims are advantageous embodiments of the subject of the invention possible.
In einer ersten vorteilhaften Ausgestaltung verläuft der Kanal in einem schiefen Winkel zur Längsachse der Ventilnadel und die zweite Konusfläche mündet. Solch ein Kanal ist einfach herzustellen und es lassen sich problemlos mehrere sol cher Kanäle über den Umfang der Ventilnadel verteilt anbringen.In a first advantageous embodiment, the Channel at an oblique angle to the longitudinal axis of the valve needle and the second cone surface empties. Such a channel is easy to manufacture and can be easily used several such channels over the Install the circumference of the valve needle in a distributed manner.
In einer weiteren vorteilhaften Ausgestaltung ist der Kanal durch eine Querbohrung und eine diese schneidende Längsbohrung gebildet, wobei die Längsbohrung in die Stirnfläche der Ventilnadel mündet. Eine solche Verbindung ergibt einen weitgehend ungedrosselten Fluss von Kraftstoff aus der Ringnut in das Reservoirvolumen, so dass auch ein leichter Druckaufbau in der Ringnut wirksam unterdrückt wird.In a further advantageous embodiment the channel through a transverse bore and a longitudinal bore intersecting it formed, the longitudinal bore in the face the valve needle opens. Such a connection results in a largely unrestricted flow of fuel from the annular groove into the reservoir volume, so that even a slight build-up of pressure in the annular groove is effectively suppressed.
Weitere vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung und der Zeichnung entnehmbar. Further advantageous refinements of the subject matter of the invention are the description and the drawing can be seen.
In der Zeichnung ist ein erfindungsgemäßes Kraftstoffeinspritzventil dargestellt. Es zeigtIn the drawing is a fuel injection valve according to the invention shown. It shows
Beschreibung der Ausführungsbeispieledescription of the embodiments
In
Bei dem Ausführungsbeispiel, das in der
linken Hälfte
der
Bei dem Ausführungsbeispiel, das auf der rechten
Seite der
In
In
Es kann alternativ zur der Darstellung
in
Der Durchmesser des Kanals
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002142685 DE10242685A1 (en) | 2002-09-13 | 2002-09-13 | Fuel injection valve for internal combustion engines comprises an annular groove between two conical surfaces which lies adjacent to both conical surfaces and has an upstream edge serving as a seat edge of a valve needle |
PCT/DE2003/001296 WO2004027254A1 (en) | 2002-09-13 | 2003-04-17 | Fuel injection valve for internal combustion engines |
EP03722284A EP1546546A1 (en) | 2002-09-13 | 2003-04-17 | Fuel injection valve for internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002142685 DE10242685A1 (en) | 2002-09-13 | 2002-09-13 | Fuel injection valve for internal combustion engines comprises an annular groove between two conical surfaces which lies adjacent to both conical surfaces and has an upstream edge serving as a seat edge of a valve needle |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10242685A1 true DE10242685A1 (en) | 2004-03-25 |
Family
ID=31895983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2002142685 Withdrawn DE10242685A1 (en) | 2002-09-13 | 2002-09-13 | Fuel injection valve for internal combustion engines comprises an annular groove between two conical surfaces which lies adjacent to both conical surfaces and has an upstream edge serving as a seat edge of a valve needle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1546546A1 (en) |
DE (1) | DE10242685A1 (en) |
WO (1) | WO2004027254A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007026122A1 (en) * | 2007-06-05 | 2008-12-11 | Volkswagen Ag | Fuel injection nozzle for internal combustion engine of motor vehicle, has body, injection opening arranged in body and needle attached with sealing surface at inner wall of body, in order to close nozzle |
CN108533432A (en) * | 2018-01-23 | 2018-09-14 | 中国第汽车股份有限公司 | A kind of atomizer improving each hole oil spout uniformity |
WO2021008961A1 (en) | 2019-07-17 | 2021-01-21 | Robert Bosch Gmbh | Fuel injector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1496246A1 (en) * | 2003-07-07 | 2005-01-12 | Delphi Technologies, Inc. | Injection nozzle |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3605082A1 (en) * | 1986-02-18 | 1987-08-20 | Bosch Gmbh Robert | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
JPH04295176A (en) * | 1991-03-25 | 1992-10-20 | Nissan Motor Co Ltd | Fuel injection nozzle |
GB9425652D0 (en) * | 1994-12-20 | 1995-02-22 | Lucas Ind Plc | Fuel injection nozzle |
DE10031264A1 (en) * | 2000-06-27 | 2002-01-17 | Bosch Gmbh Robert | Fuel injection valve for IC engines with even fuel supply to all injection openings even if valve member is misaligned |
-
2002
- 2002-09-13 DE DE2002142685 patent/DE10242685A1/en not_active Withdrawn
-
2003
- 2003-04-17 EP EP03722284A patent/EP1546546A1/en not_active Withdrawn
- 2003-04-17 WO PCT/DE2003/001296 patent/WO2004027254A1/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007026122A1 (en) * | 2007-06-05 | 2008-12-11 | Volkswagen Ag | Fuel injection nozzle for internal combustion engine of motor vehicle, has body, injection opening arranged in body and needle attached with sealing surface at inner wall of body, in order to close nozzle |
CN108533432A (en) * | 2018-01-23 | 2018-09-14 | 中国第汽车股份有限公司 | A kind of atomizer improving each hole oil spout uniformity |
WO2021008961A1 (en) | 2019-07-17 | 2021-01-21 | Robert Bosch Gmbh | Fuel injector |
Also Published As
Publication number | Publication date |
---|---|
WO2004027254A1 (en) | 2004-04-01 |
EP1546546A1 (en) | 2005-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination |