EP0984159B1 - Injecteur de carburant avec limitation de course - Google Patents

Injecteur de carburant avec limitation de course Download PDF

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Publication number
EP0984159B1
EP0984159B1 EP99117143A EP99117143A EP0984159B1 EP 0984159 B1 EP0984159 B1 EP 0984159B1 EP 99117143 A EP99117143 A EP 99117143A EP 99117143 A EP99117143 A EP 99117143A EP 0984159 B1 EP0984159 B1 EP 0984159B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
needle
nozzle body
nozzle needle
holder
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.)
Expired - Lifetime
Application number
EP99117143A
Other languages
German (de)
English (en)
Other versions
EP0984159A2 (fr
EP0984159A3 (fr
Inventor
Wendelin Kluegl
Johannes Fitzner
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0984159A2 publication Critical patent/EP0984159A2/fr
Publication of EP0984159A3 publication Critical patent/EP0984159A3/fr
Application granted granted Critical
Publication of EP0984159B1 publication Critical patent/EP0984159B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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

Definitions

  • the invention relates to a fuel injector for a Internal combustion engine mentioned in the preamble of claim 1 Art.
  • a fuel injector is from EP 0 637 686 B1 known.
  • This known injection nozzle has one nozzle body and one Nozzle holder with the interposition of a stroke limiting disc screwed together using a nozzle clamping nut are.
  • a nozzle needle guided in the axial direction, the at rest in a valve seat at the lower end of the guide bore arranged spray openings seals.
  • the pilot hole the nozzle needle is still closed at one point expanded a pressure chamber, the fuel via an inlet bore can be fed at high pressure.
  • the nozzle needle also has a pressure shoulder in the area of the pressure chamber on the fuel under high pressure can attack.
  • a blind hole in the nozzle holder is one of helical compression springs loaded pressure bolt arranged.
  • This pushpin acts via a trained in the stroke limiting disc Carrying through with the nozzle needle and presses it in the idle state with a preset holding force on the Valve seat in the nozzle body. If the the pressure shoulder of the nozzle needle acting fuel pressure in the pressure chamber of the nozzle body however, this holding force exceeds the nozzle needle from the valve seat and moves axially in the direction towards the stroke limiting disc until the end face of the nozzle needle strikes the stroke limiting disc and thus the maximum Stroke of the nozzle needle and thus the injection quantity limited.
  • a generic fuel injector is from the GB 137 280 A known.
  • the object of the present invention is to limit the stroke to provide for a nozzle needle in a fuel injection system, that are easy and inexpensive to manufacture leaves.
  • a stroke limiting device is in the Fuel injector arranged in a recess, the in a contact surface between a nozzle body and a Nozzle holder is formed. This ensures only one between the nozzle body and the nozzle holder High pressure sealing surface occurs, which is essential to manufacturing simplified. It also allows you to set the maximum Hubs of a nozzle needle can be easily achieved because of the thickness the stroke limiting device which determines the stroke of the nozzle needle, when grinding the contact surface of the nozzle holder or the nozzle body in which it is arranged, automatically is also adjusted.
  • the stroke limitation device multilayer structure with two rigid outer Layers and a compressible intermediate layer, wherein the layer thickness slightly exceeds the depth of the recess. If nozzle body and nozzle holder then together will be braced up, the compressible intermediate layer compressed to an incompressible state so that the stroke limiting device the stop pressure of the nozzle needle withstand.
  • This version enables a particularly cost-effective Manufacture of the lifting device as by compressible intermediate layer the layer thickness of the stroke limiting device is essentially uncritical and thus no too great demands on manufacturing accuracy are. Also, in terms of the planarity of the outside Layers of the stroke limiting device have large tolerances be allowed.
  • Fig. 1 shows a first embodiment in which a nozzle body 1 by means of a union nut 3 with a nozzle holder 2 is tight.
  • a guide bore 11 in the nozzle body is a nozzle needle 4 guided in the axial direction.
  • the nozzle needle 4 is at its front end with a conical tip (not shown) provided with a post inside valve seat (not shown) in the nozzle body, which preferably has several spray openings, works together.
  • the guide bore 11 is further in a middle Area expanded to a pressure chamber in which the nozzle needle has a pressure shoulder. This pressure room is still with a high pressure inlet bore formed in the nozzle body 1 12 connected via the pressure chamber under high pressure standing fuel is supplied.
  • the nozzle holder 2 has a guide bore, the Longitudinal axis preferably with the longitudinal axis of the guide bore 11 is aligned in the nozzle body 1. Furthermore, in the Wall of the nozzle holder 2, a high pressure inlet bore 22 trained to fit the high pressure inlet bore 12 in the nozzle body 1 connects to pass fuel.
  • a pressure pin 5 arranged with a control (not shown) is in an operative connection that the Push pin 5 loaded with a desired holding pressure.
  • a such control can be electromagnetic or piezoelectric take place, or also achieved by a spring device become.
  • the pressure pin 5 acts via an interposed stamp 6 onto the nozzle needle 4, with nozzle needle 4, pressure pin 5 and stamp 6 preferably for achieving good power transmission are axially aligned.
  • a spring washer on one shoulder in the spring chamber 7 is arranged.
  • a coil spring 8 supported at one end. The other end of the coil spring 8 acts with one End face of the stamp 6 together.
  • the coil spring 8 is designed so that they over the stamp 6, the nozzle needle 4 in depressurized state when there is no fuel pressure in the pressure chamber of the nozzle body 1 is present, against the valve seat in the nozzle body presses and thus prevents fuel injection. This ensures that the failure of the Push pin 5 interacting control an emergency operation Fuel injector is possible.
  • the guide bore is over most of their cross-sectional area to a paragraph 24 extended in which a stroke limiting disc 9 is arranged is.
  • the stroke limiting disc 9 is - like that shown in Fig. 2 Section along the A-A line shows - preferably eye-shaped, the two elongated end sections semicircular around the fixing pin holes 25 in Nozzle holder 3, in the fixing pins arranged on the nozzle body 1 can be inserted for positioning, cut out are.
  • the shape of the shoulder 24 in the nozzle holder 2 is adapted to the shape of the stroke limiting disc 9, so that a tight fit is achieved, with in the wall between High pressure inlet bore 22 and guide bore preferably no heel area is formed to prevent this section becomes too thin to the fuel pressure in the high pressure inlet bore 22 to withstand.
  • Fuel pressure which is the pressure shoulder on the nozzle needle 4 acted on via the pressure pin 5 and Stamp 6 exceeds the holding pressure acting on the nozzle needle 4, lifts the nozzle needle 4 from the valve seat and moves axially against the pressure pin 5 and the punch 6 to the Shoulder 42 on the nozzle needle 4 on the stroke limiting disc 9 stops and thus limits the maximum stroke of the nozzle needle. This maximum stroke essentially determines the amount of over the spray holes in the valve seat of injected fuel.
  • the exact fit and flat with the contact surface between nozzle holder 2 and nozzle body 1 in paragraph 24 in Nozzle holder is designed to be simple comply with the desired tolerances for this maximum stroke.
  • the stroke limiting disc 9 can be a simple turned part - preferably made of hard metal - are manufactured, whereby the thickness of the stroke limiting disc 9, the maximum stroke the nozzle needle 4 determines the fundamentally necessary Face grinding of the nozzle holder can be adjusted exactly.
  • the stroke limiting disc 19 has two rigid outer plates 191, 192, which have a compressible Intermediate layer 193 are connected.
  • the two outer ones Plates 191, 192 of the stroke limiting disk 19 are here - similar to the stroke limiting disc shown in FIG. 1 -
  • the compressible Intermediate layer 193, on the other hand, preferably consists of Silicone or a similar rubber-like material.
  • the stroke limitation disc 19 is manufactured so that its total thickness slightly larger than the depth of the shoulder 124 in the nozzle body is designed, the intermediate layer 193 not cover the entire inner surfaces of the plates 191, 192.
  • the multi-layer design of the stroke limiting disk 19 with A compressible intermediate layer 193 simplifies production the stroke limiting disc, because of the thickness large tolerances are permitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (2)

  1. Injecteur de carburant comprenant
       un corps d'injecteur (1) qui renferme une aiguille d'injecteur (4) disposée mobile et possédant une butée (42),
       un porte-injecteur (2) qui renferme une tige de pression (5) disposée mobile, et un dispositif de limitation de la course (9, 19) disposé entre le corps d'injecteur (1) et le porte-injecteur (2),
       dans lequel le corps d'injecteur (1) et le porte-injecteur (2) sont serrés l'un contre l'autre, une liaison fonctionnelle existe entre l'aiguille d'injecteur (4) et la tige de pression (5), et une course maximale de l'aiguille d'injecteur (4) est déterminée par une course de l'aiguille d'injecteur (4) allant d'une position de fermeture jusqu'à une position dans laquelle la butée de l'aiguille d'injecteur (4) est appuyée contre le dispositif de limitation de la course (9, 19), et
       dans lequel le dispositif de limitation de la course (9, 19) est disposé avec ajustement précis dans un évidement (24 ; 124) qui est constitué, sur une surface de portée entre le corps d'injecteur (1) et le porte-injecteur (2), sous la forme d'un renfoncement prévu à une surface terminale du corps d'injecteur (1) ou à une surface terminale du porte-injecteur (2),
    caractérisé en ce que
       le dispositif de limitation de la course (19) présente une structure stratifiée comprenant deux couches extérieures rigides (191, 192) et une couche intermédiaire compressible (193), une épaisseur de la structure stratifiée étant calculée de manière que la couche intermédiaire compressible (193) soit comprimée jusqu'à atteindre un état incompressible lors du serrage du corps d'injecteur (1) et du porte-injecteur (2).
  2. Injecteur de carburant selon la revendication 1,
       dans lequel le dispositif de limitation de la course (9, 19) est réalisé en forme de rondelle et présente un passage central (91) à travers lequel s'étend la liaison fonctionnelle entre l'aiguille d'injecteur (1) et la tige de pression (4).
EP99117143A 1998-08-31 1999-08-31 Injecteur de carburant avec limitation de course Expired - Lifetime EP0984159B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19839632A DE19839632A1 (de) 1998-08-31 1998-08-31 Kraftstoffeinspritzdüse mit Hubbegrenzung
DE19839632 1998-08-31

Publications (3)

Publication Number Publication Date
EP0984159A2 EP0984159A2 (fr) 2000-03-08
EP0984159A3 EP0984159A3 (fr) 2003-01-29
EP0984159B1 true EP0984159B1 (fr) 2004-07-28

Family

ID=7879315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99117143A Expired - Lifetime EP0984159B1 (fr) 1998-08-31 1999-08-31 Injecteur de carburant avec limitation de course

Country Status (2)

Country Link
EP (1) EP0984159B1 (fr)
DE (2) DE19839632A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10052146A1 (de) * 2000-10-20 2002-05-08 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10123218A1 (de) * 2001-05-12 2002-11-14 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE102004025729A1 (de) * 2004-05-26 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine
WO2016188577A1 (fr) * 2015-05-28 2016-12-01 Robert Bosch Gmbh Injecteur à rampe commune

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026572B (de) * 1956-11-16 1958-03-20 Friedmann & Maier Ag Einspritzduese fuer Einspritzbrennkraftmaschinen
DE3311138A1 (de) * 1983-03-26 1984-10-04 L'Orange GmbH, 7000 Stuttgart Kraftstoffeinspritzanlage fuer eine brennkraftmaschine
GB9211069D0 (en) * 1992-05-23 1992-07-08 Lucas Ind Plc Fuel injection nozzles
DE4310154A1 (de) * 1993-03-29 1994-10-06 Bosch Gmbh Robert Kraftstoff-Einspritzdüse für Brennkraftmaschinen
GB9323236D0 (en) * 1993-11-11 1994-01-05 Lucas Ind Plc Fuel injection nozzle
DE19714186A1 (de) * 1997-04-07 1998-10-08 Bosch Gmbh Robert Verfahren zum Herstellen einer geteilten Scheibe

Also Published As

Publication number Publication date
EP0984159A2 (fr) 2000-03-08
DE19839632A1 (de) 2000-03-02
EP0984159A3 (fr) 2003-01-29
DE59910050D1 (de) 2004-09-02

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