WO2002099269A1 - Injecteur destine a injecter du carburant sous haute pression - Google Patents

Injecteur destine a injecter du carburant sous haute pression Download PDF

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Publication number
WO2002099269A1
WO2002099269A1 PCT/DE2002/001802 DE0201802W WO02099269A1 WO 2002099269 A1 WO2002099269 A1 WO 2002099269A1 DE 0201802 W DE0201802 W DE 0201802W WO 02099269 A1 WO02099269 A1 WO 02099269A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle needle
injector
valve piston
pressure piece
nozzle
Prior art date
Application number
PCT/DE2002/001802
Other languages
German (de)
English (en)
Inventor
Josef Helmrich
Matthias Lorenz
Christian Lorenz
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 WO2002099269A1 publication Critical patent/WO2002099269A1/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
    • 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
    • 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
    • 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 an injector for injecting fuel under high pressure into the combustion chamber of an internal combustion engine in injection systems, such as those used in fuel injection systems with high-pressure chamber (common rail).
  • injection systems such as those used in fuel injection systems with high-pressure chamber (common rail).
  • high-pressure chamber common rail
  • nozzle needle stroke settings are used in which the needle stroke of the nozzle needle in the injector body is adjusted by means of a cylindrically designed pressure piece guided in a bore of the injector.
  • the pressure piece has a material bore into which an end pin of the nozzle needle engages.
  • the blind bore side or nozzle needle end face of the pressure piece comes to rest on the annular surface of the nozzle needle surrounding the pin.
  • a valve piston faces away from the nozzle needle on the end face of the pressure piece and there also engages the end of the valve piston surrounding compression spring on the pressure piece to act on the nozzle needle in the closing direction.
  • valve piston has a blind hole pointing towards the nozzle needle, into which the pin of the nozzle needle, which is already known from EP 0 548 916, projects, which thus produces the power transmission between these parts.
  • the end of the valve piston is guided in a specially provided socket. The closing force that is to be applied to the nozzle needle is transmitted solely via the valve piston.
  • the pressure pieces previously used are manufactured in dimensional groups.
  • the dimension groups are very costly to manufacture and measure, since only the smallest tolerances are permitted, which increases the measuring effort not inconsiderably.
  • connection between the pressure piston and the nozzle needle is designed such that the valve piston rests directly on the end face of the nozzle needle.
  • the pressure piston has e.g. a pin with which it comes to rest on the end face and which leads a closing spring surrounding the pin, which is otherwise supported directly between the valve piston and the end face of the nozzle needle.
  • a sleeve is provided which serves as a spacer between the valve piston and the nozzle needle and which accommodates the closing spring of the nozzle needle in the interior. Both versions have in common that the pin, the sleeve and the closing spring are spaced from the surrounding injector wall, so that no wear can arise from contact with them, but the spring is constantly clamped between the moving parts.
  • Fig. 1 shows a two-part injector with a cylindrical pressure piece between the valve piston and nozzle needle face
  • Fig. 2 shows an ector body with a sleeve between the nozzle needle surface and the spring.
  • the injector 1 shows an injector with a cylindrical pressure piece, which is arranged between the valve piston end face and the nozzle needle end face.
  • the injector made of a material that is permanently resistant to high mechanical loads, consists of interconnected components, injector body 1.1 and nozzle body 1.2, which are screwed together by a nozzle clamping nut 3.
  • injector body 1.1 In a bore 5 in the injector body 1.1, an axial stroke-carrying valve piston 4 is accommodated, which extends coaxially to the axis of symmetry of the injector body 1.1.
  • a bore 6 is made in the nozzle body 1.2, in which a nozzle needle 19 is received in an axially movable manner.
  • Nozzle body 1.2 the two bore sections in the injector body 1.1 and in the nozzle body 1.2 of an inlet bore 16 for the fuel under high pressure, coming from the high-pressure collection chamber, are connected to one another. A perfect connection between the
  • the injector body 1.1 and the nozzle body 1.2 are produced by two centering pins 10, one of which is shown in section in FIG. 1.
  • Each centering pin 10 engages on the one hand in a centering hole 11 which is formed in the injector body 1.1.
  • the other end of this centering pin 10, which bridges the parting line 13, is enclosed by a centering hole 12 which is made in the nozzle body 1.2.
  • a shim 7 surrounding the valve piston 4 is embedded, against which a compression spring 14, which surrounds the end of the valve piston 4 and is received by the bore 5 in the injector body 1.1, bears.
  • the other end of the compression spring 14 rests on a shoulder of a cylindrical pressure piece in the form of a disk 8, which, facing the side of the nozzle needle, has a recess in its end face, which preferably has the shape of a blind bore 22.
  • a pin 23 protruding coaxially from the bore 6 in the nozzle body 1. 2 protrudes into this at the end face 25.
  • the bore 6 in the nozzle body opens into a chamber 20, from which a nozzle needle bore 9 extends, which ends at the nozzle needle seat 25.
  • a section of the inlet bore 16 for fuel under high pressure which is to be injected is shown opening into the chamber 20.
  • the disk 8 has a diameter which is so small that a sufficient distance from the surrounding wall 29 is maintained in all operating states of the injector, so that no frictional wear can occur between these parts.
  • the disc also compensates for coaxial misalignment between the valve piston 4 and the nozzle needle, which is preferably caused by the non-contacting of the valve piston on the disc 8 and the connection which also permits a transverse displacement in the region of the recess 22 and the pin 23.
  • the pressure piece is designed as a sleeve 31 instead of in the form of a disk.
  • This includes the end of the valve piston 4, the now sits directly on a flat end face 30 of the nozzle needle 19.
  • the sleeve sits next to the end of the valve piston on the edge region of the end face 30 of the nozzle needle and serves as a support for the prestressed compression spring 14 and as a transmission element of the force of the spring on the nozzle needle.
  • the sleeve 31 is provided with a reduced outer diameter 32 toward the nozzle needle so as to lie within the projection of the end face 30 of the nozzle needle.
  • the nozzle needle 19 can be actuated by the valve piston 4 without the force of a force, which ensures that the nozzle needle 19 does not tilt in its bore 6 formed in the nozzle body 1.2, which merges into the chamber 20. Due to the given distance of the pressure piece 8, be it as a disc or be it as a sleeve, contact with the wall of the injector body can be prevented and thus considerably less wear on the movable component components pressure body 17 and nozzle needle 9 and on the injector body 1.1 can be achieved.

Landscapes

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

Abstract

L'invention concerne un injecteur (1) conçu pour injecter du carburant sous haute pression dans la chambre de combustion d'un moteur à combustion interne. Cet injecteur comporte un piston à soupape (4) qui effectue un mouvement alternatif axial produisant l'actionnement d'une aiguille d'injection (19), ainsi qu'un ressort précontraint qui, à une extrémité, est maintenu de manière stationnaire au niveau du côté opposé à l'aiguille d'injection, et dont l'autre extrémité repose sur la face de l'aiguille d'injection par l'intermédiaire d'un corps de pression (8). L'injecteur selon l'invention est caractérisé en ce que ce corps de pression (8) se situe à une certaine distance de la paroi du logement de l'injecteur qui l'entoure, afin d'empêcher une usure par frottement.
PCT/DE2002/001802 2001-06-01 2002-05-18 Injecteur destine a injecter du carburant sous haute pression WO2002099269A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10126954.4 2001-06-01
DE2001126954 DE10126954A1 (de) 2001-06-01 2001-06-01 Injektor zum Einspritzen von unter hohem Druck stehendem Kraftstoff

Publications (1)

Publication Number Publication Date
WO2002099269A1 true WO2002099269A1 (fr) 2002-12-12

Family

ID=7687041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/001802 WO2002099269A1 (fr) 2001-06-01 2002-05-18 Injecteur destine a injecter du carburant sous haute pression

Country Status (2)

Country Link
DE (1) DE10126954A1 (fr)
WO (1) WO2002099269A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365032A1 (fr) * 1976-09-18 1978-04-14 Lucas Industries Ltd Injecteur de carburant pour moteur a combustion interne
JPS60169634A (ja) * 1984-02-10 1985-09-03 Mazda Motor Corp ディ−ゼルエンジンの燃料噴射装置
US4635854A (en) * 1984-05-10 1987-01-13 Diesel Kiki Co., Ltd. Fuel injection valve for internal combustion engines
US4957085A (en) * 1989-02-16 1990-09-18 Anatoly Sverdlin Fuel injection system for internal combustion engines
EP0548916A1 (fr) 1991-12-24 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique d'injection de combustible
EP0690223A2 (fr) 1994-07-01 1996-01-03 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Dispositif d'ajustement de la levée d'aiguille d'un injecteur de combustible
US5626294A (en) * 1995-02-22 1997-05-06 Navistar International Transportation Corp. Dimethyl ether powered engine
DE19634105A1 (de) 1996-08-23 1998-01-15 Daimler Benz Ag Einspritzventil für Verbrennungskraftmaschinen
DE19716220A1 (de) * 1997-04-18 1998-10-22 Bosch Gmbh Robert Kraftstoffeinspritzeinheit für Brennkraftmaschinen
DE19825171A1 (de) 1997-12-18 1999-07-01 Orange Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3610658A1 (de) * 1985-11-21 1987-05-27 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365032A1 (fr) * 1976-09-18 1978-04-14 Lucas Industries Ltd Injecteur de carburant pour moteur a combustion interne
JPS60169634A (ja) * 1984-02-10 1985-09-03 Mazda Motor Corp ディ−ゼルエンジンの燃料噴射装置
US4635854A (en) * 1984-05-10 1987-01-13 Diesel Kiki Co., Ltd. Fuel injection valve for internal combustion engines
US4957085A (en) * 1989-02-16 1990-09-18 Anatoly Sverdlin Fuel injection system for internal combustion engines
EP0548916A1 (fr) 1991-12-24 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique d'injection de combustible
EP0690223A2 (fr) 1994-07-01 1996-01-03 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Dispositif d'ajustement de la levée d'aiguille d'un injecteur de combustible
US5626294A (en) * 1995-02-22 1997-05-06 Navistar International Transportation Corp. Dimethyl ether powered engine
DE19634105A1 (de) 1996-08-23 1998-01-15 Daimler Benz Ag Einspritzventil für Verbrennungskraftmaschinen
DE19716220A1 (de) * 1997-04-18 1998-10-22 Bosch Gmbh Robert Kraftstoffeinspritzeinheit für Brennkraftmaschinen
DE19825171A1 (de) 1997-12-18 1999-07-01 Orange Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine

Also Published As

Publication number Publication date
DE10126954A1 (de) 2002-12-12

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