DE102006038534A1 - Fuel injector for internal combustion engine, has control valve with control piston that operates on valve seat, where control piston exhibits pressure surface, which exposes closure area that is supplied with system pressure - Google Patents
Fuel injector for internal combustion engine, has control valve with control piston that operates on valve seat, where control piston exhibits pressure surface, which exposes closure area that is supplied with system pressure Download PDFInfo
- Publication number
- DE102006038534A1 DE102006038534A1 DE200610038534 DE102006038534A DE102006038534A1 DE 102006038534 A1 DE102006038534 A1 DE 102006038534A1 DE 200610038534 DE200610038534 DE 200610038534 DE 102006038534 A DE102006038534 A DE 102006038534A DE 102006038534 A1 DE102006038534 A1 DE 102006038534A1
- Authority
- DE
- Germany
- Prior art keywords
- control
- nozzle needle
- pressure
- fuel injector
- actuator
- 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- Withdrawn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
- 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
-
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft einen Kraftstoffinjektor mit einem Steuerventil nach dem Oberbegriff des Anspruchs 1.The The invention relates to a fuel injector with a control valve according to the preamble of claim 1.
Aus
Aufgabe der vorliegenden Erfindung ist es, einen Kraftstoffinjektor mit einem schnell schaltenden Servo-Ventil mit einer kleinen Bauform zu schaffen.task The present invention is a fuel injector with a fast-switching servo valve with a small design to accomplish.
Die Aufgabe der Erfindung wird mit den kennzeichnenden Maßnahmen des Anspruchs 1 gelöst. Durch den erfindungsgemäßen Kraftstoffinjektor ist es möglich, dass ein kompakter leistungsstarker Kraftstoffinjektor geschaffen wird, der mit einem relativ kleinen Servo-Ventil auskommt, da das Stellelement im Wesentlichen nur die Öffnungskraft für das Steuerventil liefern muss und die Schließkraft zum Schließen des Steuerventils vom Systemdruck geliefert wird.The The object of the invention is with the characterizing measures of claim 1. By the fuel injector according to the invention it is possible that created a compact powerful fuel injector is, who gets along with a relatively small servo valve, since the Actuator essentially only the opening force for the control valve must deliver and the closing force to close of the control valve is supplied by the system pressure.
Vorteilhafte Weiterbildungen der Erfindung sind durch die Maßnahmen der Unteransprüche möglich.advantageous Further developments of the invention are possible by the measures of the subclaims.
Das Steuerventil ist dabei zweckmäßigerweise derart aufgebaut, dass der Steuerkolben eine Dichtkante aufweist, die mit einem Durchmesser d2 auf den Ventilsitz einwirkt, und dass die auf den Ventilsitz aufliegende Dichtkante einen Ringraum im geschlossenen Zustand der Düsennadel von einem Niederdruckraum trennt, der mit einem Niederdruck-Rücklaufsystem verbunden ist. Der Ringraum ist über eine Zulaufleitung mit Zulaufdrossel mit Systemdruck versorgt, wobei die Zulaufleitung mit Zulaufdrossel vom Schließraum in den Ringraum führt. Der Steuerkolben weist dabei einen aktorseitigen Kolbenabschnitt mit einem Durchmesser d1 und einen düsennadelseitigen Kolbenabschnitt mit einem größeren Durchmesser d2 auf, wobei am Übergang vom düsennadelseitigen Durchmesser d2 zum aktorseitigen Durchmesser d1 die Dichtkante ausgebildet ist, und wobei der düsennadelseitige Kolbenabschnitt in einer Führungsbohrung hydraulisch dicht geführt ist, so dass sich zwischen der Führungsbohrung und dem Ventilsitz im Injektorkörper der Ringraum ausbildet. Um ohne Kopplerraum auszukommen, ist der Steuerkolben mit dem Stellelement fest verbunden ist. Dazu ist es zweckmäßigerweise, dass das als Piezo-Aktor ausgebildete Stellelement in einer Aufnahme in einem Aufnahmeraum des Injektorkörpers gelagert ist, wobei die Aufnahme aus einem Material, beispielsweise Invar besteht, das einen thermischen Ausdehnungskoeffizienten aufweist, der den thermischen Ausdehnungskoeffizienten des Stellelements, insbesondere eines Piezoelements des Piezo-Aktors zu kompensieren vermag. Weiterhin ist der Piezo-Aktor in Öffnungsrichtung des Steuerkolbens mittels eines Vorspannelements vorgespannt.The Control valve is expediently constructed such that the control piston has a sealing edge, which acts with a diameter d2 on the valve seat, and that the sealing edge resting on the valve seat has an annular space in the closed state of the nozzle needle from a low pressure space connected to a low pressure return system. The annulus is over a supply line with inlet throttle supplied with system pressure, wherein the supply line with inlet throttle leads from the closing space into the annulus. Of the Control piston has an actuator side piston section a diameter d1 and a nozzle needle side Piston section with a larger diameter d2, where at the transition from nozzle needle side Diameter d2 to the actuator-side diameter d1 the sealing edge is formed, and wherein the nozzle needle side Piston section in a guide bore hydraulically tight, so that is between the guide hole and the valve seat in the injector body the annulus forms. To get along without coupler space, is the spool is firmly connected to the actuator. It is expedient, that formed as a piezo actuator actuator in a recording is stored in a receiving space of the injector body, wherein the Recording from a material, for example, Invar exists, the one has thermal expansion coefficient of the thermal Expansion coefficient of the actuating element, in particular a piezoelectric element of the piezo actuator is able to compensate. Furthermore, the piezo actuator in the opening direction of the control piston biased by a biasing element.
Ausführungsbeispielembodiment
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt eine Schnittdarstellung des erfindungsgemäßen Kraftstoffinjektors.One embodiment The invention is illustrated in the drawing and in the following description explained in more detail. The FIG. 1 shows a sectional view of the fuel injector according to the invention.
Der
dargestellte Kraftstoffinjektor weist ein Gehäuse
Im
Düsenkörper
Zur
Aufnahme des Piezo-Aktors
Im
Teil
Durch
den Injektorkörper
Die
Drosselplatte
Der
Kraftstoffinjektor arbeitet wie folgt: Durch Anlegen einer Spannung
an den Piezo-Aktor
Zum
Schließen
der Düsennadel
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610038534 DE102006038534A1 (en) | 2006-08-17 | 2006-08-17 | Fuel injector for internal combustion engine, has control valve with control piston that operates on valve seat, where control piston exhibits pressure surface, which exposes closure area that is supplied with system pressure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610038534 DE102006038534A1 (en) | 2006-08-17 | 2006-08-17 | Fuel injector for internal combustion engine, has control valve with control piston that operates on valve seat, where control piston exhibits pressure surface, which exposes closure area that is supplied with system pressure |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006038534A1 true DE102006038534A1 (en) | 2008-02-21 |
Family
ID=38954835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610038534 Withdrawn DE102006038534A1 (en) | 2006-08-17 | 2006-08-17 | Fuel injector for internal combustion engine, has control valve with control piston that operates on valve seat, where control piston exhibits pressure surface, which exposes closure area that is supplied with system pressure |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102006038534A1 (en) |
-
2006
- 2006-08-17 DE DE200610038534 patent/DE102006038534A1/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R012 | Request for examination validly filed |
Effective date: 20130605 |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |