DE2943895A1 - IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level - Google Patents

IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level

Info

Publication number
DE2943895A1
DE2943895A1 DE19792943895 DE2943895A DE2943895A1 DE 2943895 A1 DE2943895 A1 DE 2943895A1 DE 19792943895 DE19792943895 DE 19792943895 DE 2943895 A DE2943895 A DE 2943895A DE 2943895 A1 DE2943895 A1 DE 2943895A1
Authority
DE
Germany
Prior art keywords
spring
push rod
needle
fuel injector
engine fuel
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
DE19792943895
Other languages
German (de)
Inventor
Dipl.-Ing. Dr. Ewald Eblen
Odon Kopse
Walter 7000 Stuttgart Mladek
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 DE19792943895 priority Critical patent/DE2943895A1/en
Publication of DE2943895A1 publication Critical patent/DE2943895A1/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
    • 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift

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

The combustion engine fuel injector comprises two parallel valve needles (5,6) arranged in independent pressure chambers (7,8) in the nozzle body (1). Their closure springs (11,13) are contained in a common spring chamber (9) in the nozzle holder (3). One needle (6) has its spring (13) arranged directly above it, whilst the spring (11) of the other needle (5) is positioned at a level above the spring (13) and connected to its needle (5) via a small-diameter push rod (12) parallel to the spring (13). The spring (11), may be contained in a blind bore (10) which communicates with the chamber (9) and acts as guide for the spring support disc (17) at the top of the rod.

Description

Kraftstoffeinspritzdüse für BrennkraftmaschinenFuel injector for internal combustion engines

Stand der Technik Die Erfindung geht aus on einer Kraftstoffeinspritzdüse nach der Gattung des Hauptanspruchs. Ein Problem bei den bekannten Kraftstoffeinspritzdüsen dieser Art besteht darin, daß der Durchmesser dieser Düsen und damit der Durchmesser der diese Düsen aufnehmenden Bohrung verhältnismäßig groß ist, daß Jedoch von den lMotorkonstrukteuren immer kleinere Durchmesser gefordert werden. Diese Forderungen hängen mit den ûptimierungen der Brennkraftmaschine zusammen und treten besonders bei kleineren Brennkraftmaschinen auf.PRIOR ART The invention is based on a fuel injection nozzle according to the genre of the main claim. A problem with the known fuel injectors of this type consists in that the diameter of these nozzles and therefore the diameter the bore receiving these nozzles is relatively large, but that of the lMotor designers are being asked to have ever smaller diameters. These demands are related to the optimization of the internal combustion engine and occur in particular in smaller internal combustion engines.

Vorteile der Erfindung Die erfindungsgemäße Kraftstoffeinspritzdüse mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß eine wesentliche Verkleinerung des Einspritzdüsendurchmessers vorgenommen werden kann5 ohne daS dadurch funktioilelle Nachteile entstehen.Advantages of the Invention The fuel injector of the invention with the characterizing features of the main claim has the advantage over this that a substantial reduction in the injection nozzle diameter can be made can5 without any functional disadvantages.

Im Gegenteil durch die versetzte Anordnung der Schließfedern und durch die Druckstange wird verhindert, daß sich die Schließfedern gegenseitig stuten, bzw. es wird eine gute Bohrung der Schließfedern erzielt.On the contrary, due to the staggered arrangement of the closing springs and the push rod prevents the closing springs from stealing each other, or a good bore of the closing springs is achieved.

Zeichnung In Ausführungsbeispiel es Gegenstandes der Erfindung t i der Zeichnung vereinfacht dargestellt und im f@lgenden her beschrieben.DRAWING In an exemplary embodiment of the subject matter of the invention t i shown in simplified form in the drawing and described in the following.

Beschreibung des Erfiodugsbeispiels In einer kraftstoffeinspritzdüse ist ein Düsenkörper 1 unter wischenschaltung einer Zwischenplatte 2 an einen Düsenhalter 3 durch eine ffberwurfmutter 4 gespannt. Im Düsenkörper 1 sind wem Ventilnadeln 5 und 6 angeordnet, dcc ml dem Düsenkörper 1 unabhängige Druckräume 7 und 5 begrenzen.Description of the Erfiodugsbeispiel In a fuel injector is a nozzle body 1 with an intermediate plate 2 on a nozzle holder 3 clamped by a union nut 4. In the nozzle body 1 are valve needles for whom 5 and 6 arranged, dcc ml limit the nozzle body 1 independent pressure spaces 7 and 5.

Im Düsenhalter 3 ist ein Federraum 9 vorgesehen, in den eine exzentrisch zur Düsenachse angeordnete Sackbohrung 10 einm;+ndet. Diese Sackbohrung 10 nimmt eine Schließfeder 11 für die Ventilnadel 5 auf, wobei zwischen Ventilnadel 5 und Feder 11 eine den Federraum 9 durchlaufende Druckstange 12 angeordnet ist. Diese Druckstange 12 verlGuft unmittelbar neben der Schließfeder 13 der Ventilnadel 6, welche im Federraum 9 angeordnet ist. Um ein Reiben der Feder 15 an der Druckstange 12 zu vermeiden, ist die Feder 13 auf der der Nadel 6 abgewandten Seite über einen Federteller 15 und einen Stift 16 im Düsenhalter 3 geführt. Die Druckstange 12 ist durch einen Teller 17 der Feder 11 in der Bohrung 10 geführt.In the nozzle holder 3, a spring space 9 is provided in which one eccentric Blind bore 10 arranged to the nozzle axis is inserted. This blind hole 10 takes a closing spring 11 for the valve needle 5, between valve needle 5 and Spring 11 a push rod 12 passing through the spring chamber 9 is arranged. These The push rod 12 runs directly next to the closing spring 13 of the valve needle 6, which is arranged in the spring chamber 9. To prevent the spring 15 from rubbing against the push rod To avoid 12, the spring 13 is on the side facing away from the needle 6 via a Spring plate 15 and a pin 16 guided in the nozzle holder 3. The push rod 12 is guided through a plate 17 of the spring 11 in the bore 10.

Da der Durchmesser der Druckstange 12 nur einen Kleinteil der Feder 11 aufweist, können die Ventilnadeln 5 und 6 verhältnismäßig dicht nebeneinander angeordnet werden und es kann der Gesamtdurchmesser der Einspritzdüse entsprechend stark reduziert werden.Since the diameter of the push rod 12 is only a small part of the spring 11, the valve needles 5 and 6 can be relatively close to one another be arranged and it can be the overall diameter of the injector accordingly can be greatly reduced.

Claims (3)

Ansprüche Kraftstoffeinspritzdüse für Brennkraftmaschinen mit zwei parallelen Ventilnadeln mit unabhängigen Druckräumen in einem Düsenkörper und mit einem gemeinsamen Federraum im Düsenhalter, welcher zwei die Ventilnadeln belastende Schließfedern aufnimmt, dadurch gekennzeichnet, daß unmittelbar neben der einen Feder (13) eine als Kraftübertragungsglied zwischen der anderen Feder (11) und deren Nadel (5) dienende, einen wesentlich kleineren Durchmesser als die Feder aufweisende Druckstange (12) angeordnet ist. Claims fuel injector for internal combustion engines with two parallel valve needles with independent pressure chambers in a nozzle body and with a common spring space in the nozzle holder, which two loads the valve needles Receives closing springs, characterized in that immediately next to the one Spring (13) as a force transmission member between the other spring (11) and its Needle (5) serving, having a much smaller diameter than the spring Push rod (12) is arranged. 2. Kraftstoffeinspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß zur Aufnahme der anderen Feder (11) eine zum Federraum (9) hin offene, den Federteller (17) der Druckstange (12) führende Sackbohrung (11) dient. 2. Fuel injection nozzle according to claim 1, characterized in that that for receiving the other spring (11) one to the spring chamber (9) open, the spring plate (17) the push rod (12) leading blind hole (11) is used. 3. Kraftstoffeinspritzdüse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Federauflager (15) der einen Feder (13) auf der der Nadel (6) abgewandten Seite gegen radiales Verschieben gesichert ist. 3. Fuel injection nozzle according to claim 1 or 2, characterized in that that the spring support (15) of one spring (13) on the one facing away from the needle (6) Page is secured against radial displacement.
DE19792943895 1979-10-31 1979-10-31 IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level Ceased DE2943895A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792943895 DE2943895A1 (en) 1979-10-31 1979-10-31 IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792943895 DE2943895A1 (en) 1979-10-31 1979-10-31 IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level

Publications (1)

Publication Number Publication Date
DE2943895A1 true DE2943895A1 (en) 1981-05-14

Family

ID=6084776

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19792943895 Ceased DE2943895A1 (en) 1979-10-31 1979-10-31 IC engine fuel injector - has two independent parallel needles, one directly sprung, other loaded via push rod to spring at higher level

Country Status (1)

Country Link
DE (1) DE2943895A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151293A1 (en) * 1981-12-24 1983-07-07 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION SYSTEM FOR DIRECT FUEL INJECTION IN COMBUSTION ENGINES
US4524737A (en) * 1983-08-26 1985-06-25 Robert Bosch Gmbh Fuel injection apparatus with an auxiliary pump for pilot and main injection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688516A (en) * 1951-09-08 1954-09-07 Allan G Bell Fuel injector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688516A (en) * 1951-09-08 1954-09-07 Allan G Bell Fuel injector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bosch-Druckschrift, Düsen und Düsenhalter, VDT-AKP 6/1, (1.Ausg.), (05.72) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151293A1 (en) * 1981-12-24 1983-07-07 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION SYSTEM FOR DIRECT FUEL INJECTION IN COMBUSTION ENGINES
EP0083001B1 (en) * 1981-12-24 1988-04-20 Robert Bosch Gmbh Fuel injection system for direct fuel injection in internal-combustion engines
US4524737A (en) * 1983-08-26 1985-06-25 Robert Bosch Gmbh Fuel injection apparatus with an auxiliary pump for pilot and main injection

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8131 Rejection