EP1537327A1 - Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape - Google Patents

Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape

Info

Publication number
EP1537327A1
EP1537327A1 EP03794766A EP03794766A EP1537327A1 EP 1537327 A1 EP1537327 A1 EP 1537327A1 EP 03794766 A EP03794766 A EP 03794766A EP 03794766 A EP03794766 A EP 03794766A EP 1537327 A1 EP1537327 A1 EP 1537327A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
nozzle
injector
face
needle
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.)
Withdrawn
Application number
EP03794766A
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Stahl
Wolfgang Stoecklein
Dietmar Schmieder
Olivier Kristen
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 EP1537327A1 publication Critical patent/EP1537327A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • 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
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention relates to an injector for injecting fuel into combustion chambers of internal combustion engines, in particular to a sentoventil-controlled common rail injector, with a nozzle body, on the combustion chamber-side (free) end of which a nozzle outlet is formed, with a nozzle needle which is in a longitudinal recess of the nozzle body is arranged to be axially movable or actuatable, with a closing part which closes the rear end (facing away from the nozzle outlet) and (above) adjoins the nozzle body and forms an opening stop for the nozzle needle, here with the rear end (facing away from the nozzle outlet) End face of the nozzle needle cooperates and thus limits the opening stroke of the nozzle needle, and with a control chamber formed between the rear nozzle needle end face and the end part, which is in hydraulic connection with a pressure connection serving the fuel supply TEHT.
  • a CR injector of the aforementioned type has become known from DE 199 36 668 A1.
  • the rear end face of the nozzle needle which cooperates with the flat stop face of the end part, is also flat.
  • the required needle stroke is produced by appropriate grinding of the back face of the nozzle needle.
  • the needle stroke tolerance has to be as small as possible - because of the quantity scatter of the individual injectors - there are several disadvantages from the known concept of two flat stop surfaces. On the one hand, it has the disadvantage that - due to manufacturing tolerances in the manufacture of the nozzle needle on the one hand and the guide bore for the
  • Nozzle needle in the nozzle body on the other hand - slight lateral or tilting movements of the nozzle needle occur during the axial movement of the nozzle needle (so-called "forehead").
  • the needle stroke can change when the nozzle needle is rotated, thereby increasing the needle stroke tolerance Oblique division of the end part to the guide hole of the nozzle needle.
  • the object of the invention is to avoid the disadvantages described above, ie to create an injector that is characterized by a minimal nozzle needle stroke tolerance and a constant nozzle needle stroke, even when the nozzle needle is twisted, and by a comparatively small adjustment tolerance when grinding in the nozzle needle stroke distinguished.
  • the object is achieved in an injector of the type described in the introduction in that the rear end face of the nozzle needle and / or the stop face of the end part interacting therewith is designed such that in the open position of the nozzle needle there is a punctiform or essentially punctiform contact surface between the rear nozzle needle face and the stop surface of the end piece.
  • the nozzle needle should have a spherical, preferably spherical, rear end face.
  • the measures according to the invention result at the upper stop of the nozzle needle, i.e. in the open position thereof, an (almost) punctiform contact surface between the end part and the rear (upper) end face of the nozzle needle.
  • the radius of the rear end of the nozzle needle should be dimensioned where it comes into contact with the stop surface of the end part so that - taking into account that on the nozzle needle effective opening force - the permissible Hertz 'see pressure is not exceeded.
  • Fig. 1 shows an embodiment of a CR injector, in vertical longitudinal section, and
  • FIG. 2 shows the detail “A” from FIG. 1 in an enlarged manner compared to FIG. 1
  • nozzle needle 14 designates 10 as a whole a multi-offset nozzle body with a central longitudinal recess 11 which narrows at its lower end to form a nozzle outlet 12. Above the nozzle outlet 12, the longitudinal recess 11 forms a conical valve seat 13. In the longitudinal recess 11. a nozzle needle, numbered 14 overall, is arranged to be axially movable. A lower, tapered end 15 of the nozzle needle 14 is conical and interacts with the likewise conical valve seat 13.
  • valve body 10 Above the valve body 10 and seated sealingly on its upper end face 16, a disc-shaped end part 17 is arranged.
  • the end part 17 is adjoined at the top - likewise sealingly - by a servo valve body 18, in which a servo valve 19, for example a piezoelectrically operated one, is received.
  • Valve body 10, end part 17 and servo valve body 18 are enclosed by an injector housing 20 and fixed in the assignment shown in FIG. 1.
  • a high-pressure channel 21 is incorporated into the servo valve body 18, which - via a (not shown) high-pressure connection - is in hydraulic connection with a (also not shown) fuel high-pressure accumulator (so-called common rail) ,
  • the high-pressure duct 21 opens out - via an extension 22 - on the lower end face 23 of the servo valve body 18 and is there with two into it
  • End part 17 incorporated holes 24 and 25 hydraulically connected.
  • the high-pressure fuel passes through the first bore 24 - via an annular space 26 - into the longitudinal recess 11 of the nozzle body 10 and thus - with the valve 13, 15 open - to the nozzle outlet 12.
  • a special feature of the second bore 25 is that it narrows in steps to a throttle bore 27 (so-called inlet throttle). Via this inlet throttle 27, fuel reaches a control chamber 28 which extends between the upper end of the nozzle needle 14 and the lower end face of the end part 17, numbered 29.
  • the control chamber 28 reaches its maximum volume when the nozzle needle 14 is in the closed position shown in FIGS. 1 and 2, the conical end 15 of which is sealingly in contact with the valve seat 13. In this closed position, the nozzle needle 14 is held on the one hand by the liquid pressure prevailing in the control chamber 28 and on the other hand by a compression spring 30.
  • a further bore 35 is machined, which is on the one hand via bore 24 and annular space 26 - with the high-pressure duct 21 and on the other hand - via a throttle bore 36 (so-called discharge throttle) - with the servo valve 19 in hydraulic operative connection.
  • the rear (upper) end face of the nozzle needle 14, numbered 37 has a spherical curvature.
  • the spherical radius is shown in Fig. 1 and 2 are denoted by r kuge ⁇ .
  • the apex P (see FIG. 2) of the spherical surface 37 determines the upper stop of the nozzle needle 14, which interacts with the surface 29 of the end part 17 as a counter stop.
  • the nozzle needle stroke denoted by h DN in FIG. 2.
  • the nozzle needle 14 In its (upper) open position, the nozzle needle 14 thus comes to rest at point P with the surface 29 of the end part 17.
  • the avoidance of a (large) surface contact of the nozzle needle 14 on the stop face 29 of the end part 17 results in an - otherwise possible - "sticking" of the nozzle needle 14 in its (
  • the spherical / spherical nozzle needle end face 37 ensures that a sufficiently large control space 28 remains in the open position of the nozzle needle 14.
  • the spherical / spherical design of the nozzle needle end face 37 results in the resulting almost punctiform nozzle needle stop moreover the advantage that the nozzle needle stroke h DN always remains constant in the event of any rotation of the nozzle needle 14 or when it is inclined due to manufacturing tolerances.

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 servant à injecter du carburant dans des chambres de combustion de moteurs à combustion interne, en particulier un injecteur à rampe commune l'alimentation (common rail) commandé par servo-soupape. Cet injecteur comprend un corps de buse (10) à l'extrémité côté chambre de combustion (libre) duquel est formée une sortie de buse (12), ainsi qu'un pointeau de buse (14) qui est disposé de façon à se déplacer ou être actionné axialement dans un évidement longitudinal (11) du corps de buse (10). L'injecteur comporte également un obturateur (17) qui est placé à côté (au-dessus) du corps de buse (10) et ferme l'extrémité arrière (opposée à la sortie de buse (12)) de l'évidement longitudinal (11). Cet obturateur forme une butée d'ouverture (29) pour le pointeau de soupape et coopère ainsi avec la face arrière (opposée à la sortie de buse (12)) du pointeau de buse (14) pour limiter la course d'ouverture (hDN) du pointeau de buse (14). Enfin, l'injecteur comporte un espace de commande (28) formé entre la face arrière (37) du pointeau de buse et l'obturateur (17), lequel est en communication hydraulique avec un raccord sous pression (21) servant à l'alimentation en carburant. Une particularité essentielle de cet injecteur réside dans le fait que la face arrière (37) du pointeau de buse (14) et/ou les faces de butée (29) de l'obturateur (17) collaborant avec ladite face sont conçues de sorte que lorsque le pointeau de buse (14) est en position d'ouverture, la zone de contact (P) entre la face arrière (37) du pointeau de buse et la face de butée (29) de l'obturateur (17) a la forme d'un point ou sensiblement la forme d'un point.
EP03794766A 2002-09-06 2003-06-26 Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape Withdrawn EP1537327A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10241462 2002-09-06
DE10241462A DE10241462A1 (de) 2002-09-06 2002-09-06 Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere servoventilgesteuerter Common-Rail-Injektor
PCT/DE2003/002129 WO2004025114A1 (fr) 2002-09-06 2003-06-26 Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape

Publications (1)

Publication Number Publication Date
EP1537327A1 true EP1537327A1 (fr) 2005-06-08

Family

ID=31724480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03794766A Withdrawn EP1537327A1 (fr) 2002-09-06 2003-06-26 Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape

Country Status (5)

Country Link
EP (1) EP1537327A1 (fr)
JP (1) JP2005538296A (fr)
KR (1) KR20050040936A (fr)
DE (1) DE10241462A1 (fr)
WO (1) WO2004025114A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT500774B8 (de) * 2004-08-06 2007-02-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
JP2007315186A (ja) * 2006-05-23 2007-12-06 Aisan Ind Co Ltd 燃料噴射装置
DE102008003348A1 (de) * 2008-01-07 2009-07-09 Robert Bosch Gmbh Kraftstoffinjektor
FR2965018A1 (fr) * 2010-09-20 2012-03-23 Renault Sas Injecteur a fuites dynamiques reduites
CN102330627A (zh) * 2011-10-16 2012-01-25 中国兵器工业集团第七0研究所 一种用于水平双对置柴油机的共轨喷油器喷油嘴
DE102014221586A1 (de) * 2014-10-23 2016-04-28 Robert Bosch Gmbh Kraftstoffinjektor
CN106677945B (zh) * 2016-07-12 2019-07-05 江西汇尔油泵油嘴有限公司 分阶段喷油的喷油嘴以及分阶段喷油方法
FR3057623B1 (fr) * 2016-10-14 2020-12-25 Delphi Int Operations Luxembourg Sarl Membre de vanne d'un injecteur de carburant
CN112431699B (zh) * 2020-11-12 2021-12-24 一汽解放汽车有限公司 一种长针阀喷油嘴的偶件高压流量测量装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849933C2 (de) * 1998-10-29 2000-09-28 Siemens Ag Stellanordnung, insbesondere zur mechanischen Ansteuerung eines Einspritzventils einer Brennkraftmaschine
DE60015218T2 (de) * 1999-04-01 2006-02-16 Delphi Technologies, Inc., Troy Brennstoffeinspritzventil
DE19936668A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common-Rail-Injektor
DE10020166A1 (de) * 2000-04-25 2001-10-31 Bosch Gmbh Robert Düsennadel-Hubeinstellung an Injektoren von Einspritzanlagen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004025114A1 *

Also Published As

Publication number Publication date
WO2004025114A1 (fr) 2004-03-25
KR20050040936A (ko) 2005-05-03
JP2005538296A (ja) 2005-12-15
DE10241462A1 (de) 2004-03-18

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