EP1036271A1 - Injecteur pour injection de carburant intermittente - Google Patents

Injecteur pour injection de carburant intermittente

Info

Publication number
EP1036271A1
EP1036271A1 EP98965750A EP98965750A EP1036271A1 EP 1036271 A1 EP1036271 A1 EP 1036271A1 EP 98965750 A EP98965750 A EP 98965750A EP 98965750 A EP98965750 A EP 98965750A EP 1036271 A1 EP1036271 A1 EP 1036271A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve actuator
injection
pressure
control chamber
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.)
Granted
Application number
EP98965750A
Other languages
German (de)
English (en)
Other versions
EP1036271B1 (fr
Inventor
Wolfgang Scheibe
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP1036271A1 publication Critical patent/EP1036271A1/fr
Application granted granted Critical
Publication of EP1036271B1 publication Critical patent/EP1036271B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M47/027—Electrically actuated valves draining the chamber to release the 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
    • 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 injection valve for intermittent fuel injection into the combustion chamber of an internal combustion engine with a valve actuator which is axially movably guided in a valve housing between a closed and an open position and which is pressed in the closed position against an essentially conical valve seat and thus in a blind hole downstream of the Injection openings located valve seat closes and with a control chamber, which is connected via at least one inlet throttle bore with a high pressure fuel inlet line and via an outlet throttle bore with a low pressure outlet line, the pressure in the control chamber being controllable via an electromagnetically actuated control valve element and depending on Control room pressure the valve actuator is actuated.
  • valve actuator is designed as a nozzle needle, which presses with its tip onto the conical nozzle needle seat in order to keep the injection valve in the closed state.
  • the dynamic loading of the nozzle tip with the nozzle needle seat is correspondingly high, which occurs as a shock load depending on the mass of the moving nozzle needle with each closing process of the nozzle.
  • a reduction in the impact load for example due to a slower closing movement of the nozzle needle, is therefore not an option, because this would mean that an inexact metering and above all dripping of the nozzle would have to be accepted.
  • the object of the present invention is therefore to improve an injection valve of the type described in the introduction in such a way that even at extremely high injection pressures and high ones required accuracy with regard to the injection quantities, an inadmissibly high stress between the valve actuator and valve seat is avoided and long service lives of an injection valve can thus be achieved.
  • a valve actuator holder is arranged in the valve housing, which extends with a lower end in the immediate vicinity of the valve seat, the valve actuator in the lower end of the valve actuator holder is guided to permit the actuating movement and the control chamber as a bore in the valve actuator. link holder is guided up to the valve actuator and this is pressurized.
  • the inventive design of an injection valve ensures that the valve actuator operating at an extremely high pressure level and at high actuating speeds can have the lowest possible mass and thus the dynamic forces on the valve seat are significantly reduced.
  • the stationary arrangement of a valve actuator holder which extends to the immediate vicinity of the valve seat and receives the valve actuator there, is the prerequisite for the small size and thus the low mass of the valve actuator.
  • a valve actuator is provided in the arrangement according to the invention, the dimension of which in the direction of the steep movement is only very small.
  • valve actuator is a ball.
  • cylindrical valve actuators in the form of pistons are also possible, the extent in the axial direction not being chosen to be substantially larger than the diameter.
  • valve actuator holder is centered at the lower end in the valve seat itself.
  • the injection valve can be designed both in such a way that the spring force acts on the valve actuator in the closing direction, and in the opposite manner in such a way that a spring applies a permanent force to the valve actuator in the opening direction.
  • the control and the exact movement of the valve actuator is controlled by hydrauli see pressure causes. On the one hand, the high pressure from the fuel supply line is available, and on the other hand the low pressure from the fuel discharge line.
  • the actuating forces are determined by appropriate geometric design of the valve actuator with pressure attack surfaces.
  • FIG. 1 shows an injection valve according to the invention in a central longitudinal section
  • FIG. 2 shows the lower area of the injection valve shown in FIG. 1 in an enlarged view
  • FIGS. 1 and 2 shows an enlarged representation of the valve seat area of the injection valve according to FIGS. 1 and 2 and
  • Fig. 4 shows the lower region of an injection valve corresponding to Fig. 1, but with a valve actuator designed as a cylindrical piston.
  • the injection valve shown in section in FIG. 1 has a valve housing 9 with a connecting piece 29 for a high-pressure fuel line.
  • a nozzle body 11 of an injection nozzle is screwed to the lower end of the valve housing 9 by means of a nozzle nut 10.
  • a fuel feed line 13 leads from the connecting piece 29 through the valve housing 9 and through the nozzle body 11 to a valve seat 6 of the injection nozzle.
  • an essentially cylindrical valve actuator holder 14 is inserted into the nozzle body 11 and has a control chamber 2 designed as a central bore. The valve actuator holder 14 extends down to the valve seat 6.
  • An inlet throttle bore 3 is provided in the central region of the valve actuator holder 14 and connects the fuel inlet line 13 to the control chamber 2.
  • an outlet throttle bore 18 is provided which connects in the control chamber 2 to a fuel outlet line 12.
  • the cross section of the outlet throttle bore 18 is larger than the cross section of the inlet throttle bore 3.
  • valve actuator holder 14 is centered at its lower end via a centering collar 16 in the conical valve seat 6 is the control chamber 2 of the valve actuator holder 14 extends downwards to a bore in which the valve actuator 4, which is designed as a ball, is axially movable.
  • the valve actuator 4 which is designed as a ball
  • the ball sits on the conical valve seat 6, so that the downstream Blind hole 7, from which spray holes 17 start, remains depressurized As shown in FIG.
  • valve actuator 4 namely the ball
  • this pressure via the inlet throttle bore 3 being equal to the high pressure in the fuel feed line 13 is D
  • the discharge throttle bore 18 of the control chamber 2 is closed by the control valve element 8. If the control valve element 8 is now lifted by the electromagnet 28 and the discharge throttle bore against the discharge line 12 is opened, the pressure in the control chamber 2 drops and the spherical valve actuator 4 is caused by the pressure from below high pressure acting on a partial cross-section of the valve actuator is lifted from the valve seat 6.
  • valve cross-section is released and there is an injection that continues until the pressure in the control chamber 2 rises again by closing the drain throttle bore 18 by means of the control valve element 8 and that Valve actuator on the valve seat presses We from Fig. 2 easily recognizable, the stress on the valve seat 6 will remain low even at the highest pressures and pressure differences and extremely high actuating speeds of the valve actuator 4, since the mass of the valve actuator 4 is considerably less than that a conventional nozzle needle
  • valve actuator 4 In order to achieve exact positioning of the valve actuator, it may be desirable to provide an actuation of the valve actuator 4 by spring force in addition to actuation via hydraulic pressure or differential pressure.
  • FIG the valve seat 6 is held. In the closed position shown, the pressure force of the spring and the hydraulic pressure force resulting from the free cross-sectional area and the pressure prevailing in the control chamber act on the valve actuator from above - Injection of the spherical valve actuator 4 between the valve seat 6 and the largest free cross-section results and the associated pressure which corresponds to the high pressure in the fuel supply line. If the geometric conditions require it, it is but readily conceivable that the valve actuating element 4 is not acted upon in the closing direction by a compression spring but rather against the closing direction, ie the compression spring would then be fitted in blind hole 7.
  • FIG. 4 largely resembles the image according to FIG. 3 and differs only in that a stepped cylindrical piston 4a is used as the valve actuator instead of a ball.
  • the piston 4a interacts with the conical valve seat 6 and is acted upon by a compression spring 24 in the closing direction.
  • the remaining elements of the injection nozzle correspond to the above description for FIGS. 1 to 3.
  • the axial extent of the piston 4a is only slightly larger than the diameter of the valve seat. As a result, the mass of the piston 4a and, in turn, the occurrence of dynamic forces during the opening and closing process are kept low.

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 pour l'injection intermittente de carburant dans la chambre de combustion d'un moteur à combustion interne. Le régulateur (4) de cet injecteur est disposé dans un porte-régulateur (14) s'étendant jusqu'au voisinage immédiat du siège d'injecteur (6), de sorte que le régulateur d'injecteur (4) ne présente qu'un encombrement réduit et une faible masse.
EP98965750A 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente Expired - Lifetime EP1036271B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19754050 1997-12-05
DE19754050A DE19754050A1 (de) 1997-12-05 1997-12-05 Einspritzventil zur intermittierenden Brennstoffeinspritzung
PCT/EP1998/007857 WO1999030029A1 (fr) 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente

Publications (2)

Publication Number Publication Date
EP1036271A1 true EP1036271A1 (fr) 2000-09-20
EP1036271B1 EP1036271B1 (fr) 2002-03-27

Family

ID=7850892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98965750A Expired - Lifetime EP1036271B1 (fr) 1997-12-05 1998-12-03 Injecteur pour injection de carburant intermittente

Country Status (3)

Country Link
EP (1) EP1036271B1 (fr)
DE (2) DE19754050A1 (fr)
WO (1) WO1999030029A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10058010A1 (de) 2000-11-23 2002-05-29 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10061571B4 (de) * 2000-12-11 2007-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102008000702A1 (de) 2008-03-17 2009-09-24 Robert Bosch Gmbh Injektor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495504A (de) 1968-08-28 1970-08-31 Sopromi Soc Proc Modern Inject Brennstoff-Einspritzventil mit elektromagnetischer Betätigung
FR2580728B1 (fr) * 1985-04-19 1989-05-05 Alsacienne Constr Meca Systeme d'injection de combustible pour moteur diesel
IT1261149B (it) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat Valvola di dosaggio per il comando dell'otturatore di un iniettore di combustibile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9930029A1 *

Also Published As

Publication number Publication date
DE19754050A1 (de) 1999-07-15
DE59803566D1 (de) 2002-05-02
EP1036271B1 (fr) 2002-03-27
WO1999030029A1 (fr) 1999-06-17

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