WO2010023009A1 - Injecteur de carburant comportant une électrovanne - Google Patents

Injecteur de carburant comportant une électrovanne Download PDF

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Publication number
WO2010023009A1
WO2010023009A1 PCT/EP2009/058548 EP2009058548W WO2010023009A1 WO 2010023009 A1 WO2010023009 A1 WO 2010023009A1 EP 2009058548 W EP2009058548 W EP 2009058548W WO 2010023009 A1 WO2010023009 A1 WO 2010023009A1
Authority
WO
WIPO (PCT)
Prior art keywords
anchor bolt
valve
fuel injector
valve seat
bore
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.)
Ceased
Application number
PCT/EP2009/058548
Other languages
German (de)
English (en)
Inventor
Andreas Fath
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.)
Robert Bosch GmbH
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 WO2010023009A1 publication Critical patent/WO2010023009A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • 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
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
    • 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

Definitions

  • the invention relates to a fuel injector with a solenoid valve according to the preamble of claim 1.
  • FIG. 1 Such a known fuel injector is shown in FIG.
  • This known fuel injector 1 is usually used in an internal combustion engine having a plurality of cylinders, wherein each of these cylinders is associated with such an injector (fuel injection valve).
  • the injector 1 has an injection nozzle projecting into a cylinder combustion chamber of the internal combustion engine and an injection nozzle which opens and closes the injection nozzle as a function of the pressure in a control chamber 2 and is indicated here only to a small extent.
  • the control chamber 2 is permanently connected via an inlet throttle 4 to a high pressure feed line (high pressure side) 5 of the fuel.
  • a solenoid valve 6 is provided in the form of a 2/2-way valve, which opens or blocks the connection of the control chamber 2 with a low pressure chamber (low pressure side) 7, which is connected to a return flow (not shown).
  • the high-pressure feed line 5 may be connected to a high-pressure accumulator (common rail), not shown, and the return flow with leak oil.
  • the nozzle needle 3 is guided to form the control chamber 2 in a valve piece 8. Coaxially to the nozzle needle 3 branches off from the control chamber 2 a running in the valve piece 8 bore 9, which contains an outlet throttle 10 and 8 exits from the valve member 8 in the region of a valve seat 11 of the outer end face of the valve member.
  • the valve seat 11 is formed at the bottom of a guide bore 12 of the valve member 8, which is connected via transverse bores 13 with the low-pressure chamber 7.
  • an armature 14 of the solenoid valve 6 cooperates, which is guided in the guide bore 12 slidably.
  • an anchor bolt 15 is received, which is pressed by the force acting in the axial direction upstream of the valve seat 11 high pressure forces on a contact surface 16a of a holding plate 16 of the injector 1 and therefore fixed there.
  • the armature 14 is thus displaceably guided both on the anchor bolt 15 and in the valve piece 8, wherein the actual guidance of the armature 14 takes place via the anchor bolt 15.
  • a closing spring 17 the armature 14 is biased in contact with the valve seat 11.
  • the manufacturing tolerances of the valve piece 8, armature 14 and anchor bolt 15 allow a certain axial offset and tilting of the armature 14 relative to the valve piece 8 and thus relative to the valve seat 11.
  • By the closing spring 17 and the guide games can lead to bending or tilting of the anchor bolt 15.
  • the armature 14 is not seated exactly on the valve seat 11, that is, the axis of the armature 14 is not aligned coaxially with the valve seat 11 of the valve piece 8, and therefore that when the solenoid valve 6 is closed, a crescent-shaped gap between the armature 12 and Valve seat 11 remains open, which leads to a large increase in the leakage.
  • this known injector design it may occasionally happen that the leakage quantity is not reduced as expected with a reduction in the activation duration, but rather assumes increased values for short activation periods.
  • the anchor bolt is guided in a guide of the valve piece and thus permanently centered to the valve seat of the valve piece.
  • the anchor bolt in the region of the guide is preferably made as 2-, 3- or 4-Kant and has in the region of the valve seat on an undercut (eg annular groove), for a Homogeneous flow through the valve seat ensures.
  • Anchor bolt in the region of the valve seat only assume values in the region of its guide play within the guide of the valve piece.
  • the seat angle of the valve seat can be much more varied in the absence of the leadership of the anchor in the valve piece. - In contrast to the known fuel injector, a coating of the valve piece is possible.
  • FIG. 1 shows a detail of a fuel injector with a solenoid valve according to the prior art
  • 2 shows a detail of a fuel injector with a solenoid valve designed according to the invention
  • FIG. 3 is a cross-sectional view of an anchor bolt shown in FIG
  • the fuel injector 21 according to the invention shown in Fig. 2 is usually used in an internal combustion engine having a plurality of cylinders, wherein each of these cylinders is associated with such an injector (fuel injection valve).
  • the injector 21 has an injection nozzle projecting into a cylinder combustion chamber of the internal combustion engine and an injection nozzle which opens and closes the injection nozzle as a function of the pressure in a control chamber 22, only a small portion of which is indicated here.
  • the control chamber 22 is permanently connected via an inlet throttle 24 to a high pressure feed line (high pressure side) 25 of the fuel.
  • a solenoid valve 26 is provided in the form of a 2/2-way valve, the connection of the control chamber 22 with a low-pressure chamber (low pressure side) 27, which is connected to a return flow (not shown), opens or blocks.
  • the high-pressure feed line 25 may be connected to a high-pressure accumulator (common rail), not shown, and the return flow with leak oil.
  • the nozzle needle 23 is guided to form the control chamber 22 in a valve piece 28.
  • valve piece 28 Coaxial with the nozzle needle 23 branches off from the control chamber 22 a bore 29 extending in the valve piece 28, which contains an outlet throttle 30 and exits from the valve piece 28 in the region of a valve seat 31 of the outer end face of the valve piece 28.
  • the valve seat 31 is formed at the bottom of a bore 32 of the valve member 28, which is connected via transverse bores 33 with the low-pressure chamber 27. With the valve seat 31, an armature 34 of the solenoid valve 26 cooperates, which is arranged displaceably in the bore 32.
  • an anchor bolt 35 is accommodated, whose one end 35a is pressed by the force acting in the axial direction in the bore 29 high compressive forces on a contact surface 36a of a holding plate 36 of the injector 21 and is therefore fixed there.
  • the armature 34 is thus displaceably guided on the anchor bolt 35 and biased by a closing spring 37 into contact with the valve seat 31.
  • the anchor bolt 35 is remote with its holding plate 36 End 35b guided in the bore 29 of the valve member 8, whereby a guide of the armature 34 in the bore 32 of the valve member 8 is not required.
  • the anchor bolt 35 has an annular groove 38 in the region of the valve seat 31 and a free flow cross section in the form of three recesses 39 at its end 35b guided in the bore 29 of the valve piece 28 (FIG. 3).
  • the recesses 39 are open at the front and open into the annular groove 38, which ensures a homogeneous flow through the valve seat 31.
  • the guided end 35 a of the anchor bolt 34 has a 3-edge cross-section, whereby the annular groove 38 is connected to the bore 29. Between two adjacent ones
  • the anchor bolt 35 each have a guide portion 40, with which the anchor bolt 35 is guided in the bore 29.
  • the anchor bolt 35 Through its leadership in the valve member 28 of the anchor bolt 35 is permanently centered to the valve seat 31 of the valve member 28. If the anchor bolt 35, with its end 35a facing away from the valve seat 31, does not rest coaxially with the valve seat 31 on the retaining plate 36, the radial offset of the anchor bolt 35 in the area of the valve seat 31 can only assume values in the region of its guide play within the bore 29.
  • the armature 34 In its closed valve position shown in Fig. 2, the armature 34 abuts against the valve seat 31 of the valve member 28, whereby the connection of the control chamber 22 to the low pressure chamber 27 is blocked and therefore the nozzle needle 23 is closed by the pressure prevailing in the control chamber 22 high pressure. If a magnetic coil 41 of the solenoid valve 26 is energized, the armature 34 is pulled from the valve seat 31 in its open valve position, whereby the pressure in the control chamber 22 is reduced and the nozzle needle 23 opens. In the open valve position of the armature 34, the outlet throttle 30 limits the flow. If the energization of the solenoid 40 is released, the armature 34 is moved back into its closed valve position via the closing spring 37 and the control chamber 22 is filled again via the inlet throttle 24.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant (21) pour des moteurs à combustion interne, comportant une chambre de commande (22) connectée à un côté haute pression (25), dont la pression sert à commander le mouvement d'une aiguille de buse (23), et une électrovanne (26) fermant ou ouvrant la connexion entre un perçage (29) provenant de la chambre de commande (22) et un côté basse pression (27). L'électrovanne (26) comporte un élément de soupape (28) pourvu d'un siège de soupape (31) dans lequel aboutit le perçage (29), un boulon d'induit (35) coaxial par rapport au siège de soupape (31), s'appuyant, avec une extrémité (35a) opposée au perçage (29), contre une surface d'appui (36a) de l'injecteur (21), et un induit (34) logé coulissant sur le boulon d'induit (35), interagissant avec le siège de soupape (31). Selon l'invention, le boulon d'induit (35) est guidé, sur son autre extrémité (35b), dans le perçage (29) de l'élément de soupape (28), et sur la longueur de guidage axiale du boulon d'induit, une section transversale d'écoulement libre est prévue, celle-ci s'étendant jusqu'au siège de soupape (31).
PCT/EP2009/058548 2008-08-25 2009-07-07 Injecteur de carburant comportant une électrovanne Ceased WO2010023009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008041502A DE102008041502A1 (de) 2008-08-25 2008-08-25 Kraftstoffinjektor mit einem Magnetventil
DE102008041502.2 2008-08-25

Publications (1)

Publication Number Publication Date
WO2010023009A1 true WO2010023009A1 (fr) 2010-03-04

Family

ID=41213313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/058548 Ceased WO2010023009A1 (fr) 2008-08-25 2009-07-07 Injecteur de carburant comportant une électrovanne

Country Status (2)

Country Link
DE (1) DE102008041502A1 (fr)
WO (1) WO2010023009A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200063703A1 (en) * 2018-08-23 2020-02-27 Progress Rail Services Corporation Electronic Unit Injector Shuttle Valve
GB2613392A (en) * 2021-12-02 2023-06-07 Delphi Tech Ip Ltd Fuel pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2988021B1 (fr) * 2012-03-15 2015-01-09 Bosch Gmbh Robert Procede de realisation d'une soupape ainsi qu'outil de matricage d'une calotte dans la broche d'induit d'une soupape

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070131789A1 (en) * 2005-12-12 2007-06-14 C.R.F. Societa Consortile Per Azioni Fuel-injection system for an internal-combustion engine and corresponding method for controlling fuel injection
DE102006050033A1 (de) * 2006-10-24 2008-04-30 Robert Bosch Gmbh Injektor, insbesondere Common-Rail-Injektor
DE102006050812A1 (de) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102006050810A1 (de) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102007001363A1 (de) * 2007-01-09 2008-07-10 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen
DE102007006946A1 (de) * 2007-02-13 2008-08-14 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070131789A1 (en) * 2005-12-12 2007-06-14 C.R.F. Societa Consortile Per Azioni Fuel-injection system for an internal-combustion engine and corresponding method for controlling fuel injection
DE102006050033A1 (de) * 2006-10-24 2008-04-30 Robert Bosch Gmbh Injektor, insbesondere Common-Rail-Injektor
DE102006050812A1 (de) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102006050810A1 (de) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102007001363A1 (de) * 2007-01-09 2008-07-10 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen
DE102007006946A1 (de) * 2007-02-13 2008-08-14 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200063703A1 (en) * 2018-08-23 2020-02-27 Progress Rail Services Corporation Electronic Unit Injector Shuttle Valve
US11746734B2 (en) * 2018-08-23 2023-09-05 Progress Rail Services Corporation Electronic unit injector shuttle valve
GB2613392A (en) * 2021-12-02 2023-06-07 Delphi Tech Ip Ltd Fuel pump
GB2613392B (en) * 2021-12-02 2024-04-03 Phinia Delphi Luxembourg Sarl Fuel pump

Also Published As

Publication number Publication date
DE102008041502A1 (de) 2010-03-04

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