DE10319980A1 - Fuel injector for diesel vehicles adds closed base to hollow needle to cover all injection ports as linked to inner needle via groove-issuing connection hole. - Google Patents
Fuel injector for diesel vehicles adds closed base to hollow needle to cover all injection ports as linked to inner needle via groove-issuing connection hole. Download PDFInfo
- Publication number
- DE10319980A1 DE10319980A1 DE2003119980 DE10319980A DE10319980A1 DE 10319980 A1 DE10319980 A1 DE 10319980A1 DE 2003119980 DE2003119980 DE 2003119980 DE 10319980 A DE10319980 A DE 10319980A DE 10319980 A1 DE10319980 A1 DE 10319980A1
- Authority
- DE
- Germany
- Prior art keywords
- hollow needle
- spray holes
- holes
- needle
- spray
- 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
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
- F02M61/1806—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
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/086—Having more than one injection-valve controlling discharge orifices
-
- 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
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
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 betrifft eine Registerdüse mit Spritzlöchern für eine Vor- und eine Haupteinspritzung von Kraftstoff in den Brennraum eines Dieselmotors.The invention relates to a register nozzle with spray holes for a pre and a main injection of fuel into the combustion chamber Diesel engine.
Moderne Dieselmotoren arbeiten mit unterbrochener Einspritzung. Der Haupteinspritzung wird eine Voreinspritzung vorgelagert und gegebenenfalls eine Nacheinspritzung nachgeschaltet.Modern diesel engines work with interrupted injection. The main injection becomes a pre-injection upstream and possibly post-injection.
Die Voreinspritzung ist dem oberen Totpunkt bis 90° Kurbelwinkel vorgelagert. Hierbei wird eine kleine Menge Dieselkraftstoff in den Brennraum des Dieselmotors eingespritzt. Der Kraftstoff verdampft und unterliegt Vorreaktionen, die den Zündverzug der Haupteinspritzmenge herabsetzen. Dadurch verringern sich der Druckanstieg, die Höhe des Spitzendrucks und die Druckschwingungen im Brennraum. Das hat eine Abnahme des Verbrennungsgeräusches und der Stickoxidemission zur Folge.The pilot injection is the top one Dead center up to 90 ° crank angle upstream. Here, a small amount of diesel fuel is in injected the combustion chamber of the diesel engine. The fuel evaporates and is subject to pre-reactions that delay the ignition of the main injection quantity decrease. This reduces the pressure rise, the level of the peak pressure and the pressure fluctuations in the combustion chamber. That has a decrease in combustion noise and the nitrogen oxide emission.
Bei einer Nacheinspritzung wird eine geringe Kraftstoffmenge bis 200° Kurbelwinkel nach dem oberen Totpunkt in den Ausschubtakt eingespritzt. Dort verdampft der Kraftstoff und dient als Reduktionsmittel für Stickstoffkatalysatoren und somit zur Stickoxidreduktion. Die Kraftstoffvor- und -nacheinspritzung kann durch kurzzeitige, minimale Öffnung der Ventilnadel eines konventionellen Einspritzventils erreicht werden. Nachteilig ist dabei jedoch die mögliche Kavitation, die bei kleinen Nadelhüben zu Verschleiß des Nadelsitzes führen kann.With a post-injection a low fuel quantity up to 200 ° crank angle injected into the extension stroke after top dead center. There the fuel evaporates and serves as a reducing agent for nitrogen catalysts and thus for nitrogen oxide reduction. The fuel pre and post injection can be opened by briefly opening the valve needle briefly conventional injection valve can be achieved. The disadvantage is however, the possible Cavitation, with small needle strokes to wear of the needle seat to lead can.
Die Nadelsitzkavitation wird durch so genannte Registerdüsen vermieden. Diese arbeiten mit zwei Düsennadeln, von denen eine nur die Voreinspritzung und beide zusammen die Hauptein spritzung steuern. Auf diese Weise werden zwei unterschiedliche Durchflussbeiwerte verwirklicht, durch die auch bei Voreinspritzung kavitationsgefährdete Nadelhübe vermieden werden.The needle seat cavitation is through so-called register nozzles avoided. These work with two nozzle needles, one of which only control the pilot injection and both together the main injection. This way two different flow coefficients realized by the needle strokes which are at risk of cavitation even during pre-injection become.
In der
Der Erfindung liegt die Aufgabe zugrunde, eine Registerdüse zu schaffen, die sich durch hohe Standzeit auszeichnet.The invention has for its object a Registerdüse to create, which is characterized by a long service life.
Die Aufgabe wird gelöst durch die Merkmale des Patentanspruchs 1.The task is solved by the features of claim 1.
Dadurch, dass die Auflagefläche des Hohlnadelbodens im Vergleich zur erheblich kleineren Querschnittsfläche der Hohlnadelwand, die im Stand der Technik als Sitzfläche zur Verfügung steht, eine großzügige Dimensionierung des Hohlnadelsitzes erlaubt, sinken dessen Belastung und Verschleiß entsprechend. Das gilt auch trotz der zusätzlichen Belastung des Hohlnadelsitzes durch die Schließkraft der Innennadel, deren Sitz sich auf der Innenseite des Hohlnadelbodens befindet.The fact that the contact surface of the Hollow needle bottom compared to the considerably smaller cross-sectional area of the Hollow needle wall, which in the prior art serves as a seat disposal stands, a generous dimensioning of the hollow needle seat, its load and wear decrease accordingly. This also applies despite the additional Loading of the hollow needle seat by the closing force of the inner needle, the Seat is located on the inside of the hollow needle floor.
Da sich das Verhältnis der Durchflussbeiwerte der Registerdüse bei Vor- und Haupteinspritzung wie maximal 1 zur Anzahl der Spritzlöcher verhält, bleibt der Mindesthub der Innennadel außerhalb kritischer Werte.Because the ratio of the flow coefficients the register nozzle with pre- and main injection as a maximum of 1 to the number of spray holes remains the minimum stroke of the inner needle outside of critical values.
Eine einfache, zuverlässige und haltbare Registerdüse wird dadurch verwirklicht, dass die Innennadel durch einen vorzugsweise direkt antreibenden Aktor antreibbar ist, dass die Hohlnadel von der Innennadel nach Durchlaufen von deren Vorspritzhub anhebbar ist und dass die Innennadel und die Hohlnadel durch Federkraft schließbar sind.A simple, reliable and durable register nozzle is achieved in that the inner needle by a that the hollow needle of the inner needle can be raised after passing through its injection stroke and that the inner needle and the hollow needle can be closed by spring force.
Es hat Vorteile, wenn die Verbindungslöcher in eine Ringnut münden, die vorzugsweise an der Außenseite des Hohlnadelbodens angeordnet ist und die die Verbindungslöcher sowie die zugeordneten Spritzlöcher miteinander verbindet. Da die Verbindungslöcher durch die Ringnut in jeder Verdrehwinkellage der Hohlnadel miteinander und mit den zugehörenden Spritzlöchern in Strömungsverbindung stehen, erübrigt sich eine Verdrehsicherung der Hohlnadel gegenüber dem Düsenkörper.It has advantages if the connection holes in open an annular groove, the preferably on the outside the hollow needle bottom is arranged and the connecting holes as well the assigned spray holes connects with each other. Because the connection holes through the ring groove in each Angular position of the hollow needle with each other and with the associated spray holes in flow connection stand, superfluous there is an anti-twist device for the hollow needle relative to the nozzle body.
Die Anordnung der Ringnut an der Außenseite des Hohlnadelbodens bietet gegenüber der auch möglichen Anordnung auf der Innenseite des Düsenkörperbodens Fertigungsvorteile. Die Verbindungslöcher müssen jedoch mit den zugeordneten Spritzlöchern in einer ersten und die übrigen Spritzlöcher in einer zweiten Spritzlochreihe getrennt angeordnet werden.The arrangement of the ring groove on the outside of the hollow needle bottom offers opposite the also possible Arrangement on the inside of the nozzle body base manufacturing advantages. The connection holes have to however with the assigned spray holes in a first and the remaining spray holes in one second row of spray holes can be arranged separately.
Die Verbindungslöcher mit den zugeordneten Spritzlöchern können auch in der zweiten und die übrigen Spritzlöcher in der ersten Spritzlochreihe angeordnet werden. Diese Lösung hat den Vorteil, dass der Lochkreisdurchmesser für die größere Zahl der übrigen Spritzlöcher größer und deren Zuströmung besser ist und dass die Ringnut bei der zweiten Spritzlochreihe kürzer und dadurch deren Totvolumen kleiner ist.The connection holes with the associated spray holes can also in the second and the rest spiracles be arranged in the first row of spray holes. Has this solution the advantage that the bolt circle diameter for the larger number of remaining spray holes is larger and their inflow better is and that the ring groove in the second row of spray holes is shorter and thereby the dead volume is smaller.
Eine vorteilhafte Weiterbildung der Erfindung besteht darin, dass die Hohlnadel in dem Düsenkörper verdrehfest geführt ist und die Verbindungslöcher direkt in die zugeordneten Spritzlöcher münden. Durch den Fortfall der Ringnut kann die Lage der Verbindungslöcher mit ihren zugeordneten Spritzlöchern und die Lage der übrigen Spritzlöcher in den Einspritzlochreihen frei gewählt werden.An advantageous development of the invention is that the hollow needle in the nozzle body is rotatably guided and the connection holes open directly into the assigned spray holes. By eliminating the annular groove, the position of the connection holes with their associated spray holes and the position of the other spray holes in the rows of injection holes can be freely selected.
Die Strömungsverhältnisse zwischen den Verbindungslöchern und den zugeordneten Spritzlöchern werden dadurch optimiert, dass zumindest eines von den gegenüberliegenden Enden der Verbindungslöcher und der zugeordneten Spritzlöcher eine Ausnehmung aufweist.The flow conditions between the connection holes and the assigned spray holes are optimized in that at least one of the opposite Ends of the connecting holes and the associated spray holes has a recess.
Die durch die Verdrehsicherung der Hohlnadel gewonnene Freiheit in der Anordnung der Spritzlöcher bietet die Möglichkeit, sämtliche Spritzlöcher in einer Spritzlochreihe mit nur einem Lochkreisdurchmesser anzuordnen. Auf diese Weise ist eine Registerdüse mit zwei Durchflussbeiwerten in nur einer Spritzlochreihe ermöglicht, die gute Voraussetzungen für eine optimale Verbrennungsabstimmung bietet.The by the anti-rotation of the Hollow needle gained freedom in the arrangement of the spray holes the possibility, all Spray holes in to be arranged in a row of spray holes with only one bolt circle diameter. This is a register nozzle with two flow coefficients in just one row of spray holes, the good conditions for offers optimal combustion tuning.
Weitere Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung und den Zeichnungen, in denen Ausführungsbeispiele der Erfindung schematisch dargestellt sind.Further features of the invention result from the following description and the drawings, in which exemplary embodiments of the invention are shown schematically.
Dabei zeigen:Show:
In
Die Innenseite des Düsenkörperbodens
Koaxial zur Hohlnadel
Im Hohlnadelboden
Die Verbindungslöcher
Die Hohlnadel
Wird die drehbare Hohlnadel
Die
Die Anordnung von
Die erfindungsgemäße Lösung funktioniert wie folgt:
Die Voreinspritzung wird durch das Anheben der Innennadel
Nach Abschluss der Voreinspritzung
wird der Nadelhub der Innennadel
In einer weiteren Ausführungsform
wird bei der Haupteinspritzung zuerst die Hohlnadel
Nach Abschluss der Haupteinspritzung schließen beide Ventilnadeln durch Federkraft. Ein Nachöffnen der Ventilnadeln für eine eventuelle Nachspritzung verläuft in gleicher Weise.After the main injection is completed, both close Valve needles by spring force. A reopening of the valve needles for a possible post-injection extends in the same way.
Die durch den breiten Hohlnadelboden
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003119980 DE10319980A1 (en) | 2003-05-05 | 2003-05-05 | Fuel injector for diesel vehicles adds closed base to hollow needle to cover all injection ports as linked to inner needle via groove-issuing connection hole. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003119980 DE10319980A1 (en) | 2003-05-05 | 2003-05-05 | Fuel injector for diesel vehicles adds closed base to hollow needle to cover all injection ports as linked to inner needle via groove-issuing connection hole. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10319980A1 true DE10319980A1 (en) | 2004-08-19 |
Family
ID=32731174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2003119980 Ceased DE10319980A1 (en) | 2003-05-05 | 2003-05-05 | Fuel injector for diesel vehicles adds closed base to hollow needle to cover all injection ports as linked to inner needle via groove-issuing connection hole. |
Country Status (1)
Country | Link |
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DE (1) | DE10319980A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004041172B3 (en) * | 2004-08-25 | 2006-01-05 | Siemens Ag | Fuel injection valve for internal combustion engines has servo valve, body and inner and outer nozzle needles constructed so that depending upon position of outer piston of servo valve the position of outer nozzle needle is adjustable |
DE102010037187A1 (en) * | 2010-08-26 | 2012-03-01 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Internal combustion engine, particularly spark-ignited internal combustion engine, has cylinder head, multiple cylinders and intake system having air distributor |
DE102011003927A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for injecting fuel into combustion chamber of combustion engine, has spraying hole at inner surface of nozzle main portion, which is arranged in region surrounded by secondary sealing seat |
DE102011003939A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for injecting fuel, has nozzle body, two injection holes and movable hollow needle for opening and closing former injection hole with sealing face in operative connection with sealing seat |
DE102011003930A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for emission of exhaust gas from combustion engine, has nozzle needle lifting hollow needle from nozzle body during preset stroke, and sealing seats arranged on inner side of nozzle body, where one seat surrounds other seat |
DE102011083291A1 (en) * | 2011-09-23 | 2013-03-28 | Continental Automotive Gmbh | Register nozzle needle for e.g. common-rail fuel injector for diesel engine of motor car, has nozzle needle and nozzle needle case sequentially releasing respective cross-section openings of injector upon control of nozzle needle and case |
US20190145339A1 (en) * | 2017-11-16 | 2019-05-16 | Caterpillar Inc. | Fuel injector |
US10563609B2 (en) | 2017-11-16 | 2020-02-18 | Caterpillar Inc. | Fuel injector |
US11549474B2 (en) | 2021-05-24 | 2023-01-10 | Caterpillar Inc. | Ducted fuel injector having nested checks with non-rotating outer check and method of operating same |
US11852113B2 (en) | 2022-02-02 | 2023-12-26 | Caterpillar Inc. | Fuel injector having spray ducts sized for optimized soot reduction |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2710138A1 (en) * | 1977-03-09 | 1978-09-14 | Maschf Augsburg Nuernberg Ag | MULTI-HOLE INJECTION NOZZLE |
DE2656276C2 (en) * | 1976-12-11 | 1991-03-21 | L'orange Gmbh, 7000 Stuttgart, De |
-
2003
- 2003-05-05 DE DE2003119980 patent/DE10319980A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2656276C2 (en) * | 1976-12-11 | 1991-03-21 | L'orange Gmbh, 7000 Stuttgart, De | |
DE2710138A1 (en) * | 1977-03-09 | 1978-09-14 | Maschf Augsburg Nuernberg Ag | MULTI-HOLE INJECTION NOZZLE |
Non-Patent Citations (1)
Title |
---|
JP 05005471 AA Patent Abstracts of Japan * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004041172B3 (en) * | 2004-08-25 | 2006-01-05 | Siemens Ag | Fuel injection valve for internal combustion engines has servo valve, body and inner and outer nozzle needles constructed so that depending upon position of outer piston of servo valve the position of outer nozzle needle is adjustable |
DE102010037187A1 (en) * | 2010-08-26 | 2012-03-01 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Internal combustion engine, particularly spark-ignited internal combustion engine, has cylinder head, multiple cylinders and intake system having air distributor |
DE102011003927A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for injecting fuel into combustion chamber of combustion engine, has spraying hole at inner surface of nozzle main portion, which is arranged in region surrounded by secondary sealing seat |
DE102011003939A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for injecting fuel, has nozzle body, two injection holes and movable hollow needle for opening and closing former injection hole with sealing face in operative connection with sealing seat |
DE102011003930A1 (en) | 2011-02-10 | 2012-08-16 | Continental Automotive Gmbh | Register nozzle for emission of exhaust gas from combustion engine, has nozzle needle lifting hollow needle from nozzle body during preset stroke, and sealing seats arranged on inner side of nozzle body, where one seat surrounds other seat |
DE102011083291A1 (en) * | 2011-09-23 | 2013-03-28 | Continental Automotive Gmbh | Register nozzle needle for e.g. common-rail fuel injector for diesel engine of motor car, has nozzle needle and nozzle needle case sequentially releasing respective cross-section openings of injector upon control of nozzle needle and case |
US20190145339A1 (en) * | 2017-11-16 | 2019-05-16 | Caterpillar Inc. | Fuel injector |
US10563609B2 (en) | 2017-11-16 | 2020-02-18 | Caterpillar Inc. | Fuel injector |
US10563597B2 (en) | 2017-11-16 | 2020-02-18 | Caterpillar Inc. | Fuel injector |
US11549474B2 (en) | 2021-05-24 | 2023-01-10 | Caterpillar Inc. | Ducted fuel injector having nested checks with non-rotating outer check and method of operating same |
US11852113B2 (en) | 2022-02-02 | 2023-12-26 | Caterpillar Inc. | Fuel injector having spray ducts sized for optimized soot reduction |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |