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WO1986002410A1 - Buse d'injecton de combustible pour moteur a combustion - Google Patents

Buse d'injecton de combustible pour moteur a combustion Download PDF

Info

Publication number
WO1986002410A1
WO1986002410A1 PCT/DE1985/000312 DE8500312W WO8602410A1 WO 1986002410 A1 WO1986002410 A1 WO 1986002410A1 DE 8500312 W DE8500312 W DE 8500312W WO 8602410 A1 WO8602410 A1 WO 8602410A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
valve needle
bushing
shoulder
valve
Prior art date
Application number
PCT/DE1985/000312
Other languages
German (de)
English (en)
Inventor
Karl Hofmann
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 WO1986002410A1 publication Critical patent/WO1986002410A1/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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • a good atomization of the fuel jet is achieved by the swirl movement caused by these injection nozzles.
  • the swirl channels are formed by oblique grooves in the nozzle body, which wall sections of the valve needle are opposite.
  • This embodiment is disadvantageous in particular in the case of injection nozzles with a valve needle opening inward against the fuel flow, because in this case the oblique grooves are provided in the interior of the nozzle body and can only be given a moderate shape and surface quality with a reasonable production outlay.
  • the swirl channels are formed by oblique grooves in the valve needle head downstream of its valve seat surface.
  • This Design requires a special shape of the valve needle and, in addition, the fuel jet is deflected several times downstream of the valve seat, with a relatively large loss of energy.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that a high shape and surface quality of the swirl channels can be achieved with normal manufacturing effort and that a valve needle of the type customary in injection nozzles without swirl device can be used.
  • the swirl device can be varied as desired without changing other nozzle components and can be adapted to the respective requirements.
  • the desired effect can be further increased if the swirl channels have a cross section which narrows towards the nozzle opening.
  • FIG. 1 shows the section of an injection nozzle on the combustion chamber side according to the exemplary embodiment, enlarged and in section
  • FIG. 2 shows an end view of the bushing of the injection nozzle according to FIG. 1 containing the oblique grooves.
  • the injection nozzle has a nozzle body 10 which, together with an intermediate part 12, is clamped to a nozzle holder 16 by means of a union nut 14.
  • a nozzle opening 18 and in front of it a conical valve seat 20 is formed which merges smoothly into a shoulder surface 22 with the same conicity.
  • a valve needle 24 is slidably mounted, which has an annular shoulder 28 in the area of a pressure chamber 26 at the transition to a shaft 30 with a smaller diameter.
  • the front end of the shaft 30 on the combustion chamber side has a sealing cone 32 which, with the valve seat 20, is one of the nozzle opening 18 upstream valve forms.
  • a connection piece for a fuel feed line is provided, from which a bore 34 leads into an annular groove 36 in the intermediate disk 12.
  • the annular groove 36 is connected via a bore 38 to an annular groove 40 in the nozzle body 10, from which a bore 42 leads into the pressure chamber 26.
  • a bore 44 which surrounds the shaft 30 of the valve needle 24 with a larger radial clearance, extends from the pressure chamber 26 to the front end of the nozzle body 10 on the combustion chamber side and merges there via the shoulder surface 22 into the valve seat 20.
  • the pressure of the supplied fuel exerts a force on the valve shoulder 24 in the space 26 on the annular shoulder 28, which force tries to move the valve needle 24 upwards away from the valve seat 20.
  • the valve needle 24 has a pin 46, which passes through a bore 48 in the washer 12 with play.
  • the annular shoulder 50 of the valve needle 24 formed at the transition to the pin 46 limits the opening stroke of the valve needle 24 in cooperation with the lower end face of the intermediate disk 12.
  • the bore 48 leads into a larger bore 52 in the intermediate disc 12, which opens into a blind hole 54 in the nozzle holder 16, which forms a chamber 56 with the bore 52 for receiving a closing spring 58. This acts in the closing direction on the valve needle 24 via a pressure piece 60 arranged in the bore 52.
  • a sleeve 62 is slidably mounted, the end face 64 facing the nozzle opening 18 with the same taper as the valve seat 20 and the shoulder surface 22 is tapered.
  • the bushing 62 is provided with a plurality of oblique grooves 66, which are evenly distributed over the circumference and which each enclose an angle ⁇ with the corresponding radial plane 68 (distorted in perspective in FIG. 2).
  • a spring 70 acts on the bushing 62, which is supported on the annular shoulder 28 of the valve needle 24 and the bushing 62 presses on the shoulder surface 22.
  • the oblique grooves 66 in the bushing 62 and the shoulder surface 22 on the nozzle body 10 together form the swirl grooves through which the fuel passes from the pressure chamber 26 to the valve seat 20 and further to the nozzle opening 18.
  • the smooth transition from the shoulder surface 22 into the valve opening ensures low-friction primary steering and introduction of the fuel into the nozzle opening 18.
  • Pressure equalization prevails at the bushing 62 itself, so that the spring 70 always holds the bushing 62 firmly against the shoulder surface 22.

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

Buse d'injection de combustible pour moteur à combustion avec un pointeau de soupape (24) sollicité par un ressort de fermeture et avec des canaux obliques menant à l'ouverture de la buse (18). Ces canaux sont constitués par des rainures (66) dans une douille (62) entourant le pointeau de soupape (24) et par des rainures correspondantes ménagées dans le corps (10) de la buse ou du pointeau (24). Par cette disposition on obtient au moyen d'opérations d'usinage conventionnelles d'excellentes surfaces pour les faces des canaux obliques (66).
PCT/DE1985/000312 1984-10-16 1985-09-11 Buse d'injecton de combustible pour moteur a combustion WO1986002410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3437760.3 1984-10-16
DE19843437760 DE3437760A1 (de) 1984-10-16 1984-10-16 Kraftstoff-einspritzduese fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO1986002410A1 true WO1986002410A1 (fr) 1986-04-24

Family

ID=6247923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1985/000312 WO1986002410A1 (fr) 1984-10-16 1985-09-11 Buse d'injecton de combustible pour moteur a combustion

Country Status (3)

Country Link
EP (1) EP0197057A1 (fr)
DE (1) DE3437760A1 (fr)
WO (1) WO1986002410A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003225A1 (fr) * 1986-10-30 1988-05-05 Allied Corporation Injecteur a tourbillon de haute pression
WO1988003226A1 (fr) * 1986-10-30 1988-05-05 Allied Corporation Injecteur muni d'une chambre de tourbillonnement
US4805837A (en) * 1986-10-30 1989-02-21 Allied Corporation Injector with swirl chamber return
GB2170269B (en) * 1985-01-26 1989-05-10 Daimler Benz Ag A fuel injection valve
FR2726861A1 (fr) * 1994-11-11 1996-05-15 Volkswagen Ag Injecteur pour un moteur a combustion interne a piston alternatif

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744494B3 (fr) * 1996-02-01 1998-01-02 Peugeot Motocycles Sa Injecteur de carburant, notamment dans un moteur thermique de vehicule
DE19813020A1 (de) 1998-03-25 1999-09-30 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102008012356A1 (de) 2008-03-03 2009-09-10 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE246311C (fr) *
US1363470A (en) * 1919-05-06 1920-12-28 Carl H Knudsen Valve construction for fuel-oil motors
FR2267458A1 (fr) * 1974-04-13 1975-11-07 Daimler Benz Ag

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE246311C (fr) *
US1363470A (en) * 1919-05-06 1920-12-28 Carl H Knudsen Valve construction for fuel-oil motors
FR2267458A1 (fr) * 1974-04-13 1975-11-07 Daimler Benz Ag

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170269B (en) * 1985-01-26 1989-05-10 Daimler Benz Ag A fuel injection valve
WO1988003225A1 (fr) * 1986-10-30 1988-05-05 Allied Corporation Injecteur a tourbillon de haute pression
WO1988003226A1 (fr) * 1986-10-30 1988-05-05 Allied Corporation Injecteur muni d'une chambre de tourbillonnement
US4805837A (en) * 1986-10-30 1989-02-21 Allied Corporation Injector with swirl chamber return
FR2726861A1 (fr) * 1994-11-11 1996-05-15 Volkswagen Ag Injecteur pour un moteur a combustion interne a piston alternatif
GB2294974A (en) * 1994-11-11 1996-05-15 Volkswagen Ag I.c.engine fuel injection nozzle
GB2294974B (en) * 1994-11-11 1998-06-03 Volkswagen Ag An injection nozzle for use in a reciprocating-piston internal combustion engine

Also Published As

Publication number Publication date
EP0197057A1 (fr) 1986-10-15
DE3437760A1 (de) 1986-04-24

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