WO2009021862A1 - Soupape de commande pour un injecteur de carburant - Google Patents

Soupape de commande pour un injecteur de carburant Download PDF

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Publication number
WO2009021862A1
WO2009021862A1 PCT/EP2008/060155 EP2008060155W WO2009021862A1 WO 2009021862 A1 WO2009021862 A1 WO 2009021862A1 EP 2008060155 W EP2008060155 W EP 2008060155W WO 2009021862 A1 WO2009021862 A1 WO 2009021862A1
Authority
WO
WIPO (PCT)
Prior art keywords
control
annular space
control valve
valve
riser
Prior art date
Application number
PCT/EP2008/060155
Other languages
German (de)
English (en)
Inventor
Christian Faltin
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 WO2009021862A1 publication Critical patent/WO2009021862A1/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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a force-balanced control valve for a
  • Fuel injector of an internal combustion engine having the features of the preamble of claim 1.
  • a force-balanced control valve for a fuel injector is known from EP 1 612 403 A1, in which a control sleeve is guided axially movably on a valve body.
  • the control sleeve defines an annular space to the outside, which is connected to a control chamber of a nozzle needle of the fuel injector via a drain hole.
  • a closing spring By a closing spring, the control sleeve against an am
  • the control sleeve is moved by an electromagnetic actuator and thereby operated without force, that is, is exerted on the control sleeve by the fuel in the annulus no resulting force in the direction of movement.
  • Fuel injector, the control chamber of the nozzle needle is connected to a low pressure / return system and as a result pressure relieved.
  • Fuel pressure in the annular chamber acts on the control sleeve is equal to zero, so that by the pressure barely opening or closing forces are exerted on the valve element. Due to the fact that the high-pressure fuel that is provided by a common rail of a diesel injection system, through the interior of the valve piece in the annulus must be performed, the miniaturization of such a control valve limits. For example, with switchable pressures above 2000 bar, only valve seat diameters of more than 2.5 mm can be realized, since otherwise the risk of breakage of the valve piece in the region of the bore intersections occurs. The reason for this is mainly in the mechanical tensile stresses induced in the material of the valve piece due to the high hydraulic pressure in the bores of the hydraulic connection in this area.
  • the object of the present invention is to provide a force-balanced control valve for controlling a fuel injector, in which an asymmetrical component deformation in the guide region of the control sleeve is avoided and an improvement in the function of the fuel injector is ensured by optimizing the flow guidance.
  • Outflow restrictor forms for the control chamber, an asymmetrical component deformation is avoided in the guide region of the control sleeve and ensures a low-friction switching function of the control valve.
  • the flow guidance in the valve seat area is also advantageously influenced, whereby the control of the fuel when opening and the filling of the annular space when closing the control valve is symmetrical.
  • the oblique arrangement of the drainage throttles also offers the possibility to realize a sufficient length for a downstream of the outlet throttle diffuser to avoid cavitation damage to the valve seat. To reduce the Manufacturing effort, it may be appropriate to perform one of at least two oblique holes as a blind hole.
  • FIG. 1 shows a partial section through a control valve-side section of a
  • Fuel injector, Figure 2 shows a detail X of a first embodiment of the control valve according to the invention
  • FIG 3 shows a detail X of a second embodiment of the control valve according to the invention.
  • FIG. 1 shows a section of a control valve side fuel injector for a common rail system of a diesel injector is shown in section.
  • the section of the fuel injector shows an injector housing 10, a valve body 11, a valve piston 12 of a nozzle needle, not shown, a control valve
  • valve body 11 is hydraulically sealed in the injector 10 and has a guide portion 17 for the valve piston 12 and a valve member 18 for the control valve 13.
  • a control chamber 20 is further formed, which the valve piston 12 of the nozzle needle with a
  • Control surface 21 is exposed. Between the injector body 10 and valve body 12, an annular high pressure chamber 22 is formed, into which a high pressure bore 23 opens, which is hydraulically connected to a high pressure port 24 which is connected to the common rail system, not shown. From the high pressure chamber 22 performs an inlet bore 25 with a
  • the valve piece 18 has a guide pin 30, on which a control sleeve 31 is guided axially displaceably with a guide bore 32.
  • the control sleeve 31 is further designed with a plate-shaped portion 33.
  • Control sleeve 31 acts with a sealing surface on a formed on the valve piece 18 valve seat 35 a. Between the guide pin 30 and the control sleeve 31, an annular space 36 is formed. The control sleeve 31 is surrounded by a low-pressure chamber 37, which is connected to a pressurized with leak oil pressure, not shown, low pressure / return system.
  • Closing spring 38 acts on the control sleeve 31, so that the control sleeve 31 is held with the sealing surface against the valve seat 35 in the closed position.
  • valve piece 18 extending in the axial direction of the riser 41 and, for example, two branching oblique bores 42 are arranged.
  • the two oblique bores 42 open into the annular space 36.
  • at least one bore is designed as a through hole for forming a hydraulic connection between riser 41 and annular space 36.
  • One of the two oblique holes can be designed as a blind hole. It is essential that both oblique bores 42 realize a substantially symmetrical cross-sectional weakening on the guide pin 30.
  • the riser 41 also leads to the control chamber 20, so that via the riser 41 and at least one of the oblique holes 42 of the control chamber 20 is hydraulically connected to the annular space 36.
  • the actuating element 14, which is for example a magnetic actuator, comprises a magnetic coil 45, which acts on a magnet armature 46.
  • the magnet armature 46 is formed by the plate-shaped portion 33 of the control sleeve 31.
  • the electromagnetic actuator 14 forms together with the control valve 13, a servo-valve for controlling the control chamber 20, which operates as a 2/2-way valve.
  • both inclined bores 42 are each designed as a passage bore, so that the two inclined bores 42 form a first drainage bore 43.1 with a first outlet throttle 44.1 and a second drainage bore 43.2 with a second outlet throttle 44.2.
  • the two outlet throttles 44.1 and 44.2 are each preceded by an opening into the annular space 36 diffuser section 45.
  • first outlet throttle 44.1 and the second outlet bore 43.2 with the second outlet throttle 44.2 expediently has an angle ⁇ of 40 ° -55 °, preferably 50 °, wherein the angle ⁇ is measured with respect to a vertical plane to the central axis of the guide pin 30.
  • Drain holes 43.1 and 43.2 lead each with their outlet throttle 44.1 and
  • valve seat is in the embodiment in Figure 2 is a conical seat, preferably with less
  • one of the two oblique bores 42 may be designed as a blind bore 48, as shown in FIG. To form a substantially uniform mechanical
  • the diameter of the blind bore 48 substantially corresponds to the diameter of the diffuser section 45 of the other oblique bore 42, which forms the drainage bore 43. 1 with that of the outlet throttle 44. 1. This is a substantially symmetrical trained and im
  • valve seat 35 is designed in the embodiment in Figure 3 as a conical seat.

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 une soupape de commande pour asservir une chambre de commande (20) d'un injecteur de carburant, avec une douille de commande (31) qui est guidée en déplacement axial sur un tenon de guidage (30) d'un élément de soupape (18). Une chambre annulaire (36) est formée entre la douille de commande (31) et le tenon de guidage (30) ; elle est délimitée par la douille de commande (31) en coopération avec un siège de soupape (35). Il est prévu dans l'élément de soupape (18) un orifice ascendant (41) s'étendant essentiellement en direction axiale et une liaison hydraulique bifurquant de ce dernier, par l'intermédiaire desquels la chambre de commande (20) et la chambre annulaire (36) sont hydrauliquement reliées. Il est prévu au moins deux orifices obliques (42) disposés symétriquement qui sont dirigés depuis la chambre annulaire (36) en direction de l'orifice ascendant (41), sachant qu'au moins un des deux orifices obliques (42) constitue, en tant que liaison hydraulique (43.1, 43.2), un orifice de sortie entre la chambre de commande (20) et la chambre annulaire (36).
PCT/EP2008/060155 2007-08-13 2008-08-01 Soupape de commande pour un injecteur de carburant WO2009021862A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710038138 DE102007038138A1 (de) 2007-08-13 2007-08-13 Steuerventil für einen Kraftstoffinjektor
DE102007038138.9 2007-08-13

Publications (1)

Publication Number Publication Date
WO2009021862A1 true WO2009021862A1 (fr) 2009-02-19

Family

ID=39864889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/060155 WO2009021862A1 (fr) 2007-08-13 2008-08-01 Soupape de commande pour un injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102007038138A1 (fr)
WO (1) WO2009021862A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012223259A1 (de) * 2012-12-14 2014-06-18 Robert Bosch Gmbh Kraftstoffeinspritzventil

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612403A1 (fr) 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1731752A1 (fr) * 2005-05-27 2006-12-13 C.R.F. Società Consortile per Azioni Soupape de controle de carburant servo et injecteur de carburant avec une telle soupape
DE102006049831A1 (de) * 2006-10-23 2008-04-24 Robert Bosch Gmbh Kraftstoffinjektor mit Piezoaktor
EP1916414A2 (fr) * 2006-10-23 2008-04-30 Robert Bosch Gmbh Injecteur de carburant doté d'un piezoacteur
WO2008104423A1 (fr) * 2007-02-26 2008-09-04 Robert Bosch Gmbh Injecteur de carburant doté d'un étranglement de sortie supplémentaire ou doté d'une disposition améliorée de ce dernier dans la soupape de commande
WO2008125537A1 (fr) * 2007-04-17 2008-10-23 Robert Bosch Gmbh Injecteur
EP1985840A1 (fr) * 2007-04-23 2008-10-29 C.R.F. Società Consortile per Azioni Injecteur de carburant avec une soupape de contrôle et de dosage équilibrée pour un moteur à combustion interne

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612403A1 (fr) 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne
EP1731752A1 (fr) * 2005-05-27 2006-12-13 C.R.F. Società Consortile per Azioni Soupape de controle de carburant servo et injecteur de carburant avec une telle soupape
DE102006049831A1 (de) * 2006-10-23 2008-04-24 Robert Bosch Gmbh Kraftstoffinjektor mit Piezoaktor
EP1916414A2 (fr) * 2006-10-23 2008-04-30 Robert Bosch Gmbh Injecteur de carburant doté d'un piezoacteur
WO2008104423A1 (fr) * 2007-02-26 2008-09-04 Robert Bosch Gmbh Injecteur de carburant doté d'un étranglement de sortie supplémentaire ou doté d'une disposition améliorée de ce dernier dans la soupape de commande
WO2008125537A1 (fr) * 2007-04-17 2008-10-23 Robert Bosch Gmbh Injecteur
EP1985840A1 (fr) * 2007-04-23 2008-10-29 C.R.F. Società Consortile per Azioni Injecteur de carburant avec une soupape de contrôle et de dosage équilibrée pour un moteur à combustion interne

Also Published As

Publication number Publication date
DE102007038138A1 (de) 2009-02-19

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