WO2006003038A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

Info

Publication number
WO2006003038A1
WO2006003038A1 PCT/EP2005/051829 EP2005051829W WO2006003038A1 WO 2006003038 A1 WO2006003038 A1 WO 2006003038A1 EP 2005051829 W EP2005051829 W EP 2005051829W WO 2006003038 A1 WO2006003038 A1 WO 2006003038A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
injection valve
spring sleeve
recesses
valve according
Prior art date
Application number
PCT/EP2005/051829
Other languages
German (de)
English (en)
Inventor
Dietmar Uhlmann
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
Publication of WO2006003038A1 publication Critical patent/WO2006003038A1/fr

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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of 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
    • 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

Definitions

  • the invention is based on a fuel injection valve according to the preamble of patent claim 1.
  • Such a fuel injection valve has become known, for example, from DE 102 13382 A1.
  • the fuel injection valve known from DE 102 13 382 A1 has, as a spring element, a self-contained cylindrical spring sleeve, which has two recesses in a plurality of radial planes, so that the spring sleeve is elastically deformable in the axial direction.
  • the recesses are formed as waisted transverse slots with semicircular ends and all have the same shape or geometry.
  • the spring sleeve can be made by deep drawing in one piece, the recesses are formed after deep drawing, for example by means of a laser.
  • the fuel injection valve according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that significantly lowered by this web and recess geometry, the voltage level at the same spring rate in the spring sleeve and thus the fatigue strength is significantly improved. As a result, a more uniform distribution of stress over the entire elliptical area on the inside of the spring sleeve adjusts itself at the end of the recess and forms the supporting components and the Stress distribution in the radial direction more uniform and homogeneous.
  • the high stress level not only concentrates locally on the inside of the spring sleeve, but the entire area over the wall thickness is used for carrying.
  • the elliptical contour at the recess end on the inside and outside is preferably the same. Especially with small outer diameters offers to make the spring sleeve of a thermoformed tube into which the slots are then introduced via saws.
  • Fig. 1 is a spring sleeve of the fuel injection valve according to the invention in a perspective view
  • FIG. 2 shows a detail view of the spring sleeve according to FIG. 1 in FIG. 1;
  • Fig. 3 is a cross-sectional view of the spring sleeve according to IH-III in Fig. 1;
  • Fig. 5 is a longitudinal section through a second inventive fuel injection valve with two spring sleeves.
  • the spring sleeve 1 shown in FIG. 1 has two recesses 2 in seven radial planes, which are each separated from one another by a web 3. Through the recesses 2, the spring sleeve 1 is elastically deformable in the axial direction.
  • the spring sleeve 1 is made for example of a deep-drawn tube, in which the recesses 2 are introduced by sawing.
  • the recesses 2 all have the same shape or geometry and are designed as extending in the circumferential direction of the spring sleeve 1 transverse slots with the same slot width d.
  • the recesses 2 of a radial plane are each arranged between two recesses 2 of the adjacent radial plane.
  • each recess 2 elliptical with two radii Ri, R 2 are formed.
  • This elliptical contour of the ends 4 is the same on the inside and outside of the spring sleeve 1.
  • the webs 3 are not ring segment-shaped in cross-section, but trapezoidal.
  • the webs 3 are symmetrical to their radial center plane 6, wherein the two side edges 7 of the webs 3 each run radially inwardly towards each other.
  • a more uniform stress distribution over the entire elliptical region on the inside of the spring sleeve 1 is established at the recess end 4, and the supporting components of the webs 3 and the stress distribution in the radial direction are more uniform and homogeneous.
  • the high stress level not only concentrates locally on the inside of the spring sleeve 1, but the entire area over the wall thickness is used for carrying. Overall, so the voltage level at the same spring rate in the spring sleeve 1 is significantly lowered, thus significantly improving the fatigue strength, which - compared to known spring sleeves with waisted transverse slots and semicircular slot ends - higher spring travel can be realized.
  • the spring sleeve 1 has a
  • the spring sleeve 1 makes sense to manufacture the spring sleeve 1 from a deep-drawn tube, in which the recesses 2 are introduced via saw cuts, which have the required contour.
  • the recesses 2 can also be cut into the tube by means of a laser.
  • the injection nozzle 10 of a fuel injection valve is shown, which projects into the combustion chamber of an internal combustion engine.
  • a valve needle 11 is slidably guided with a conical valve sealing surface 12, which hydraulically and by the spring sleeve 1 (schematically indicated as a helical spring) against a conical valve seat surface of
  • Injection nozzle 10 is pressed and closes the injection openings 13 provided there.
  • the valve needle 11 is limited with its side facing away from the combustion chamber a hydraulic control chamber 14 in which the spring sleeve 1 is arranged and supported on the housing side.
  • a feed line (not shown) opens into an annular gap 15 extending between guide bore and valve needle 21, which leads via an annular space 16 to the valve seat surface.
  • the valve needle 11 has in the annular space 16 a pressure shoulder 17 to which the pressure prevailing in the annular space 16 pressure on the valve needle 11 in the opening direction, while the prevailing in the control chamber 14 control pressure acts on the valve needle 11 in the closing direction.
  • valve needle 11 has on its side facing away from the combustion chamber a guide projection 18 on which the spring sleeve 1 is attached.
  • valve needle 11 is slidably guided in an additional valve sleeve 21.
  • the slidably guided in an axial guide bore valve sleeve 21 has a conical valve sealing surface 22 and is by a second spring sleeve 1 '(schematically indicated as a coil spring) pressed against a second conical valve seat surface of the injection nozzle 20, where it closes provided there second injection openings 23.
  • the other end of the spring sleeve 1 ' is supported on the housing side.
  • a supply line 24 opens into an annular gap 25 extending between the guide bore and the valve sleeve 21, which leads to the second valve seat surface.
  • the valve sleeve 21 has in the region of the feed line 24 a pressure shoulder 26, on which the fuel supplied via the feed line 24 acts in the opening direction on the valve sleeve 21. If the pressure acting on the pressure shoulder 36 is sufficient to control the valve sleeve 21 against the action of the spring sleeve V, the injection takes place with the pressure prevailing in the annular gap 25
  • Valve needle 11 and valve sleeve 21 are not coupled to each other, so that the injection can be done either with the pressure prevailing in the annular space 16 or in the annular gap 25 fuel pressure.

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

Soupape d'injection de carburant pour moteurs à combustion interne comprenant au moins un élément formant soupape qui, par son déplacement à l'encontre de la force élastique d'un manchon élastique cylindrique (1), déformable en direction axiale, commande l'arrivée de carburant dans la chambre de combustion du moteur, le manchon élastique (1) présentant dans plusieurs plans radiaux, dans chacun de ceux-ci, au moins deux évidements (2), et les évidements (2) étant réalisés sous la forme de rainures transversales s'étendant dans le sens périphérique dudit manchon (1). L'invention est caractérisée en ce que les évidements (2) ont une largeur de rainure (d) constante et présentent des extrémités (4) en forme générale d'ellipse, et en ce que la section d'une traverse (3) située entre deux évidements (2) n'est pas en forme de segment annulaire.
PCT/EP2005/051829 2004-06-30 2005-04-25 Soupape d'injection de carburant WO2006003038A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004031597.3 2004-06-30
DE200410031597 DE102004031597A1 (de) 2004-06-30 2004-06-30 Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2006003038A1 true WO2006003038A1 (fr) 2006-01-12

Family

ID=34966580

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/051829 WO2006003038A1 (fr) 2004-06-30 2005-04-25 Soupape d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102004031597A1 (fr)
WO (1) WO2006003038A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035038A1 (de) 2006-07-28 2008-01-31 Epcos Ag Federelement sowie Piezoaktor mit dem Federelement
US8100346B2 (en) * 2007-11-30 2012-01-24 Caterpillar Inc. Piezoelectric actuator with multi-function spring and device using same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283987A (ja) * 1988-09-21 1990-03-26 Toyota Motor Corp 圧電アクチュエータ
DE4335329A1 (de) * 1993-10-18 1995-04-20 Fichtel & Sachs Ag Gerollte Buchse, insbesondere für einen Schwingungsdämpfer
WO2000008353A1 (fr) * 1998-08-06 2000-02-17 Siemens Aktiengesellschaft Unite actionneur piezo-electrique
US20030034594A1 (en) * 2001-08-16 2003-02-20 Robert Bosch Gmbh Spring bushing and method for producing a spring bushing
WO2003033933A1 (fr) * 2001-10-09 2003-04-24 Siemens Aktiengesellschaft Procede de fabrication d'un ressort tubulaire et unite d'actionnement comportant un tel ressort tubulaire
DE10213382A1 (de) 2002-03-26 2003-10-16 Bosch Gmbh Robert Kraftstoffeinspritzventil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283987A (ja) * 1988-09-21 1990-03-26 Toyota Motor Corp 圧電アクチュエータ
DE4335329A1 (de) * 1993-10-18 1995-04-20 Fichtel & Sachs Ag Gerollte Buchse, insbesondere für einen Schwingungsdämpfer
WO2000008353A1 (fr) * 1998-08-06 2000-02-17 Siemens Aktiengesellschaft Unite actionneur piezo-electrique
US20030034594A1 (en) * 2001-08-16 2003-02-20 Robert Bosch Gmbh Spring bushing and method for producing a spring bushing
WO2003033933A1 (fr) * 2001-10-09 2003-04-24 Siemens Aktiengesellschaft Procede de fabrication d'un ressort tubulaire et unite d'actionnement comportant un tel ressort tubulaire
DE10213382A1 (de) 2002-03-26 2003-10-16 Bosch Gmbh Robert Kraftstoffeinspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 268 (E - 0939) 11 June 1990 (1990-06-11) *

Also Published As

Publication number Publication date
DE102004031597A1 (de) 2006-02-09

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