EP1296054B1 - Injecteur pour un moteur à combustion - Google Patents

Injecteur pour un moteur à combustion Download PDF

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Publication number
EP1296054B1
EP1296054B1 EP02017581A EP02017581A EP1296054B1 EP 1296054 B1 EP1296054 B1 EP 1296054B1 EP 02017581 A EP02017581 A EP 02017581A EP 02017581 A EP02017581 A EP 02017581A EP 1296054 B1 EP1296054 B1 EP 1296054B1
Authority
EP
European Patent Office
Prior art keywords
valve
inner recess
housing part
injection valve
injection
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.)
Expired - Lifetime
Application number
EP02017581A
Other languages
German (de)
English (en)
Other versions
EP1296054A1 (fr
Inventor
Martin Grieb
Stefan Haug
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 EP1296054A1 publication Critical patent/EP1296054A1/fr
Application granted granted Critical
Publication of EP1296054B1 publication Critical patent/EP1296054B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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

Definitions

  • the invention relates to an injection valve with the features of the preamble of claim 1.
  • Such injection valve is known from DE 198 32 826 A1 known.
  • the injection valve shown there is as an injector trained and used in a common rail injection system used for internal combustion engines, which is a high-pressure fuel storage having, with a high pressure pump in Connection stands.
  • the injection valve has a with the High-pressure fuel storage connected high-pressure fuel outlet, a low-pressure fuel port for connection to a fuel return device and an electrical Connection on, which for electrical control of a electrically actuatable control valve of the injection valve, For example, a solenoid valve is used.
  • Injection valve is a valve needle via a valve piston of prevailing in a control pressure chamber fuel pressure loaded in the closing direction.
  • the control pressure chamber is arranged in a valve piece inserted into the valve housing and via an inlet channel provided with an inlet throttle and a drain channel provided with an outlet throttle with the high-pressure fuel connection, respectively connected to the fuel low pressure port.
  • a Valve member of a control valve which as a drive, for example having a magnetic actuator or a piezo actuator
  • the drainage channel can be closed and opened and the fuel pressure in the control pressure chamber for the individual Actuating operations of the valve needle can be controlled.
  • the Opening speed of the valve needle is opened Drain channel through the flow difference between inlet throttle and drain throttle and thus ultimately through the fixed set size ratio of inlet and outlet throttle certainly.
  • the inlet channel for High-pressure fuel formed in several parts and includes a introduced into a valve housing part of the injection valve Inlet bore, which in a surrounding the valve piece Annular space in an inner recess of the valve housing part opens.
  • the inlet bore discharges with its entire Inner cross section in the inner recess.
  • the injection valve according to the invention with the Features of claim 1 has the advantage that the notch stresses in the intersection between the inner recess and the access hole are significantly reduced and thereby the strength of the injector is greatly increased.
  • the injection valve according to the invention cuts the inlet bore the inner recess of the valve housing part of the injection valve only with a part of its inner cross section. Reduce by changing the shape of the transition edge advantageous in the case of a high pressure in the circumferential direction acting material stresses. Without much extra effort in the production can so the life and reliability of the injectors are increased.
  • From DE 198 59 592 C1 is a fuel injection valve for a high-pressure injection of fuel from a central high-pressure accumulator into combustion chambers of a Internal combustion engine known.
  • the high-pressure accumulator is above a Inlet throttle bore with a control chamber, which opens and closes a Injector controls, in operative connection.
  • the inlet throttle bore is opposite to the Control room aligned eccentrically.
  • transition edge between the at least one Inlet hole and the inner recess is particularly advantageous for the transition edge between the at least one Inlet hole and the inner recess to round off the valve housing part.
  • the rounding of the edge structure caused by the changed shape of the Transition edge improved high pressure resistance in the intersection area.
  • FIGS 1a and 1b show one known from the prior art Fuel injection valve 1, which for use in a fuel injection system is determined with a High-pressure fuel storage is equipped by a High pressure pump continuously with high pressure fuel is supplied.
  • the illustrated fuel injection valve 1 has a valve housing part 4 with an inner recess 20th on, which forms a longitudinal bore 5 on a part of its length, in which a valve piston 6 is arranged, with his an end to a arranged in a nozzle body 65 Valve needle 60 acts.
  • the valve needle 60 is in one Pressure chamber 61 is arranged, which via a supply bore. 8 supplied with high-pressure fuel.
  • valve needle 60 At a Opening stroke of the valve piston 6 is the valve needle 60 by constantly on a pressure shoulder 68 of the valve needle counteracting fuel high pressure in the pressure chamber the closing force of a spring 63 is raised. By then with the injection chamber 7 connected to the pressure chamber, the injection takes place of the fuel into the combustion chamber of the internal combustion engine. By lowering the valve piston 6, the valve needle in the closing direction in the valve seat 62 of the injection valve pressed and the injection process ended.
  • valve piston 6 is on his facing away from the valve needle end in a cylinder bore 11 out, which introduced into a valve piece 12 which is in a longitudinal bore 5 continuing coaxial Hole 15 is inserted with a wider diameter.
  • the Valve piece 12 is fixed in a flange portion 22 via a Screw member 23 braced with the valve housing part 4.
  • the Inner recess 20 of the valve housing part 4 also has an adjoining the bore 15 further bore with an even wider diameter, so that between the outer jacket of the valve member 12 and the cylindrical Inner wall 35 of the further bore an annular space in the inner recess 20 is created.
  • In the cylinder bore 11 of Valve piece closes an end face 13 of the valve piston.
  • a control pressure chamber 14 which via an inlet channel with a high-pressure fuel port 3 is connected.
  • the inlet channel is formed essentially in three parts.
  • a radially through the wall of the valve member 12 leading bore 26, whose inner walls on a part of its length an inlet throttle form, is with the valve piece 12 circumferentially surrounding annulus constantly connected, which annulus sealed by a sealing ring 39 to the longitudinal bore 5 is and via an inlet bore 16 and a fuel filter 42 in constant communication with the high-pressure fuel connection 3 of a screwed into the valve housing part 4 Connecting piece 9 is.
  • the inlet bore 16 opens at the known in the art injectors with their entire inner cross section in the inner recess 20 of the Valve housing part 4 a.
  • the control pressure chamber 14 Via the inlet channel with inlet throttle is the control pressure chamber 14 in the high-pressure fuel storage exposed to high fuel pressure.
  • the a provided with an outlet throttle 18 fuel drain passage 17 forms, which opens into a discharge space 19, which is connected to a fuel low-pressure connection 10 is, which in turn in a manner not shown connected to a fuel return.
  • the exit the fuel drain passage 17 is made from the valve piece 12 in the region of a conically countersunk part 21 of the outer End face of the valve piece 12.
  • a valve seat 24 is formed with the a control valve member 25 of the injection valve controlling Solenoid valve 30 cooperates.
  • the control valve member 25th is coupled to an armature 27, which armature with a Solenoid of the solenoid valve 30 cooperates.
  • the anchor 27 and the armature coupled to the control valve member 25th are constantly supported by a housing fixed Closing spring 31 is acted upon in the closing direction, so that the Control valve member 25 normally in the closed position on Valve seat 24 is present.
  • the armature 27 moves towards the electromagnet, whereby the drainage channel 17 is opened to the discharge space 19 out.
  • the opening and closing of the injector will be as follows described controlled by the solenoid valve 30.
  • Anchor 27 is constantly closed by the closing spring 31 in the closing direction acted upon, so that the control valve member 25 at non-energized electromagnet in the closed position on the valve seat 24 is applied and the control pressure chamber 14 to the discharge side 19 is closed, so that there over the inlet channel very fast the high pressure builds up, which also in the Fuel high pressure accumulator is pending.
  • About the area of Front side 13 generates the pressure in the control pressure chamber 14 a Closing force on the valve piston 6 and the associated standing valve needle 60, which is larger than the other in the opening direction due to the upcoming high pressure acting forces.
  • Fig. 2 and Fig. 3 each show a cross section through the injection valve according to the invention. Same reference numbers as in Fig. 1a and 1b mean the same parts.
  • Fig. 2 is the upper part of the valve housing part 4 is shown, the through-going Inner recess 20 through the longitudinal bore 5 and the coaxially adjoining bores 15 and 35 formed becomes.
  • the holes 15 and 35 serve to receive the Valve piece 12, wherein the outer shell of the valve piece with the inner wall of the bore 35 forms an annular space.
  • the High pressure port 3 is formed on a nozzle 9, which For example, by forging integrally with the valve housing part 4 is connected.
  • the high pressure connection 3 has a receiving bore 33 for a fuel filter on, from which mounting hole out of an access hole 16 extends into the valve housing part 4.
  • the access hole 16 intersects the inner recess 20 of the valve housing part 4 only with a part of its inner cross section 44, as best seen in FIGS. 3 and 4.
  • the Access hole 16 intersects the inner recess 20 in the area the cylinder jacket-shaped wall 35 only with the part 45th its inner cross section 44, but not with the part 46 of the Inner cross section 44. This changes the shape of the Transition edge 38 between the inlet bore 16 and the inner wall 35 of the inner recess 20 to an elongated, narrow contour.
  • the distance d the central axis 50 of the access hole 16 of the Central axis 51 of the inner recess 20 equal to the radius R. the inner recess 20 in the region of the cylinder jacket-shaped Inner wall 35.
  • the distance d can also be larger or smaller be as the radius R of the inner recess 20.
  • the access hole is 16 of the receptacle 33 of the high pressure port 3 from so far introduced into the tubular body 1, that with a section 36 a little way over the inner recess 20 also in the of the high pressure port. 3 remote from the valve body part 4 extends where it is connected to the supply bore 8.
  • the access hole is the end connected to the supply hole.
  • the supply hole 8 can also be T-shaped from the section 36 of Branch off access hole 16. The from the high-pressure fuel connection 3 outgoing access hole 16 thus supplies Advantageously, the inner recess 20 and the supply bore 8 with high pressure fuel.
  • central axis 50 of the access hole 16 in the here shown preferred embodiment perpendicular to the central axis 51 of the inner recess 20 of the valve body part. 4 runs, it is also possible that the central axis 50 of the Access hole 16 at an angle other than 90 ° extends to the central axis 51 of the inner recess.
  • transition edge 38 In the intersection area the inner wall 35 and the access hole 16 to increase it is advantageous to round the transition edge 38 and thereby deburring what, for example, in an electrochemical Procedure can be done where a material removal Workpiece inserted into the inner recess 20 becomes. Due to the good accessibility of the transition edge 38 larger fillets can be made, resulting in again positive for the strength of the injection valve in the Intersection of inner recess and inlet bore effect.
  • the invention presented here is by no means to injection valves limited for common rail systems and can applied to all injectors for internal combustion engines where there is an access hole for high pressure fuel with an inner recess of the valve body part communicates. Due to the fact that the inner recess of the inlet hole is only cut and the access hole does not completely open into the inner recess, the structure of the transition edge changes advantageously such that notch stresses are reduced and the high pressure resistance of the injection valve is increased.

Landscapes

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

Claims (5)

  1. Injecteur pour un moteur à combustion interne, notamment injecteur pour un système d'injection de carburant à rampe commune, comprenant un élément de boítier de soupape (4) avec un évidement intérieur (20) d'une section transversale pour l'essentiel circulaire et un alésage d'entrée (16) pour un carburant sous haute pression débouchant dans l'évidement intérieur (20),
    caractérisé en ce que
    l'alésage d'entrée (16) ne coupe l'évidement intérieur (20) de l'élément de boítier de soupape (4) qu'avec une partie (45) de sa section transversale intérieure (44), et l'alésage d'entrée (16) est introduit dans l'élément de boítier de soupape (4), à partir d'un raccordement (3) de l'élément de boítier de soupape (4), de manière à s'étendre par l'intermédiaire de l'évidement intérieur (20) jusque dans la partie de l'élément de boítier de soupape (4) opposée au raccordement (3).
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    l'alésage d'entrée (16), par un segment (36) s'étendant par l'intermédiaire de l'évidement intérieur (20) dans la partie de l'élément de boítier de soupape (4) opposée au raccordement (3), est relié à un alésage d'alimentation (8) qui est en communication avec une ouverture d'injection (7) de l'injecteur.
  3. Injecteur selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'arête de transition (38) entre l'au moins un alésage d'entrée (16) et l'évidement intérieur (20) de l'élément de boítier de soupape (4) est arrondie.
  4. Injecteur selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'alésage d'entrée (16) coupe avec une partie de sa section transversale intérieure (44) l'évidement intérieur (20) de l'élément de boítier de soupape (4) dans la zone d'une paroi intérieure (35) en forme d'un corps de cylindre de l'évidement intérieur (20).
  5. Injecteur selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'axe médian (50) de l'alésage d'entrée (16) est perpendiculaire à l'axe médian (51) de l'évidement intérieur (20).
EP02017581A 2001-09-22 2002-08-07 Injecteur pour un moteur à combustion Expired - Lifetime EP1296054B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10146743 2001-09-22
DE10146743A DE10146743A1 (de) 2001-09-22 2001-09-22 Einspritzventil für eine Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1296054A1 EP1296054A1 (fr) 2003-03-26
EP1296054B1 true EP1296054B1 (fr) 2005-07-27

Family

ID=7699908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017581A Expired - Lifetime EP1296054B1 (fr) 2001-09-22 2002-08-07 Injecteur pour un moteur à combustion

Country Status (3)

Country Link
EP (1) EP1296054B1 (fr)
JP (1) JP4184741B2 (fr)
DE (2) DE10146743A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10346244A1 (de) * 2003-10-06 2005-04-28 Bosch Gmbh Robert Einspritzdüse
DE102005008466A1 (de) * 2005-02-24 2006-08-31 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005016010A1 (de) 2005-04-07 2006-10-12 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102005020360A1 (de) 2005-05-02 2006-11-09 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102007018471A1 (de) 2007-04-19 2008-10-23 Robert Bosch Gmbh Verschneidungsbereich zwischen einer Hochdruckkammer und einem Hochdruckkanal
DE102007044355A1 (de) * 2007-06-21 2008-12-24 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor sowie Kraftstoffinjektor
DE102007043540A1 (de) 2007-09-12 2009-05-07 Robert Bosch Gmbh Leckagefreier Kraftstoffinjektor mit langer Düsennadel
DE102007050993A1 (de) 2007-10-25 2009-04-30 Robert Bosch Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
CN104564472A (zh) * 2014-12-31 2015-04-29 无锡威孚马山油泵油嘴有限公司 高压共轨式垫片
CN106181236A (zh) * 2016-07-13 2016-12-07 无锡派乐科技有限公司 高压共轨式垫片及其制造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3653882B2 (ja) * 1996-08-31 2005-06-02 いすゞ自動車株式会社 エンジンの燃料噴射装置
DE69719461T2 (de) * 1996-11-21 2004-01-15 Denso Corp Speicherkraftstoffeinspritzvorrichtung für Verbrennungsmotor
DE19827267A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
DE19832826C2 (de) 1998-07-21 2000-08-17 Bosch Gmbh Robert Montageverfahren für Kraftstoff-Einspritzventil und Vorsteuerventil sowie Kraftstoff-Einspritzventil
DE19859592C1 (de) * 1998-12-22 2000-05-04 Bosch Gmbh Robert Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
DE50203729D1 (de) 2005-09-01
JP4184741B2 (ja) 2008-11-19
DE10146743A1 (de) 2003-04-17
EP1296054A1 (fr) 2003-03-26
JP2003120459A (ja) 2003-04-23

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