EP1682771A1 - Soupape de pompe a injection de carburant - Google Patents

Soupape de pompe a injection de carburant

Info

Publication number
EP1682771A1
EP1682771A1 EP04786716A EP04786716A EP1682771A1 EP 1682771 A1 EP1682771 A1 EP 1682771A1 EP 04786716 A EP04786716 A EP 04786716A EP 04786716 A EP04786716 A EP 04786716A EP 1682771 A1 EP1682771 A1 EP 1682771A1
Authority
EP
European Patent Office
Prior art keywords
valve
fillet
cross
fuel
valve member
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
EP04786716A
Other languages
German (de)
English (en)
Other versions
EP1682771B1 (fr
Inventor
Stefan Schuerg
Wolfgang Stoecklein
Holger Rapp
Violaine Chassagnoux
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 EP1682771A1 publication Critical patent/EP1682771A1/fr
Application granted granted Critical
Publication of EP1682771B1 publication Critical patent/EP1682771B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M63/0077—Valve seat 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
    • F02M63/007—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • the invention relates to a valve for a fuel injection system of an internal combustion engine with the features specified in the preamble of claim 1, in particular for an injector of a common rail injection system.
  • Common-rail injection systems have a plurality of injectors which, under the control of an electronic engine control, are fed with fuel by a high-pressure pump from a central high-pressure accumulator called a common-rail and inject the fuel into the combustion chambers of the cylinders of the internal combustion engine via a valve.
  • a valve is known, inter alia, from DE 199 40 296 A1 by the applicant and, depending on the valve position, serves to connect or separate a high-pressure region of an injector of the injection system with a low-pressure region when fuel flows through the valve into the combustion chamber Injected cylinder or the supply of fuel is to be interrupted.
  • fillet is to be understood to mean a concave annular groove in the circumference of the valve member, while cross-sectional thickening is understood to mean a part of the valve member which adjoins in the flow direction and whose diameter is larger than the diameter in the region of the annular groove.
  • a particularly good vortex formation in the enlarged annular space behind the valve gap is achieved in a preferred embodiment of the invention in that an undercut circumferential tear-off edge is arranged between the fillet and the cross-sectional thickening, on which outer circumferential surface sections of the fillet adjoining this edge on both sides and the cross-sectional width increase. meet at an obtuse angle.
  • the outer peripheral surface section adjoining the edge on the side of the cross-sectional thickening is preferably oriented essentially parallel to a central axis of the valve member
  • the one adjoining the edge on the side of the fillet is Circumferential surface section preferably inclined against the direction of flow at an angle between 20 and 80 degrees, preferably between 30 and 60 degrees, towards the central axis of the valve member, so that the two peripheral surface sections meet at an angle between 200 and 260 degrees, preferably between 190 and 240 degrees.
  • a particularly simple and cost-effective production of the tear-off edge is possible according to a further preferred embodiment of the invention in that, when the valve member is finished, its outer peripheral surface is not ground down to the final diameter, at least in the region of the sealing surface opposite the valve seat and the fillet however in the area of the cross-sectional thickening, so that the material remaining there automatically leads to the formation of the tear-off edge.
  • the cross section of the valve member tapers behind the cross-sectional thickening in the direction of flow, but this need not necessarily be the case.
  • the concave fillet expediently has a radius of curvature which is preferably at least 0.2 mm and is expediently constant over the entire width of the fillet.
  • Figure 1 is a side view of a valve member or valve pin of a valve according to the invention.
  • FIG. 2 shows an enlarged cross-sectional view of the valve in the region of the valve gap according to detail Z from FIG. 1;
  • FIG. 3 shows an enlarged detail corresponding to FIG. 2, but with a different geometry of the valve member in the flow direction behind the valve gap;
  • valve 4 shows an enlarged detail corresponding to FIG. 2, but with a still different geometry of the valve member and the valve housing in the flow direction behind the valve gap.
  • valve 2 shown only partially in the drawing is part of a
  • Injector of a common rail injection system of an internal combustion engine which serves to fuel from a common rail injected central high-pressure accumulator into the combustion chambers of the cylinders of the internal combustion engine.
  • the valve 2 essentially consists of a valve housing 4, into which a rotationally symmetrical valve pin 6 (cf. FIG. 1) is inserted so as to be axially movable.
  • the valve pin 6 has a conical sealing surface 8 which tapers in the direction of flow and, when the valve 2 is closed, bears sealingly against a complementary conical valve seat 10 of the housing 4.
  • the sealing surface 8 together with the valve seat 10, delimits a valve gap 12 surrounding the valve pin 6 in the form of an annular flow channel through which the fuel to be injected closes from the high pressure side 14 of the valve 2 whose low pressure side 16 flows.
  • the valve pin 6 also has a circumferential groove 18 arranged in the outer circumference directly behind the sealing surface 8 in the direction of flow, that is to say a concave recess or groove in longitudinal section, over the axial width of which the diameter of the valve pin 6 is smaller than in front of or behind it is where the valve pin 6 is provided with a cross-sectional thickening 20 adjacent to the fillet 18.
  • the fillet 18 serves to deflect at least a portion of the fuel flow, which is discharged essentially axially in the axial direction behind the valve seat 10, in such a way that it has a speed component directed away from a central axis 22 of the valve pin 6 and after it emerges from the fillet 18 against one opposite region of the inner wall 24 of an outflow bore 26 of the valve housing 4 bounces.
  • the fuel flow is divided into two partial flows, the larger of which is directed after the impact along the inner wall 24 of the outflow bore 26 into the downstream part of the bore 26, during the smaller is directed back towards the valve gap 12 against the flow direction.
  • the angle of inclination of the fuel stream emerging from the groove 18 with respect to the central axis 22 of the valve pin 6 must not be too small, since otherwise all of the fuel is directed directly into the outflow bore 26. Therefore, on the one hand, the fillet 18 should not be formed too flat, but should have a certain minimum depth T (FIG. 1) in relation to the subsequent cross-sectional thickening, which in the middle of the valve pin 6 has a diameter Sealing surface of 1.35 mm should preferably be greater than 0.04 mm.
  • the fillet 18 should not be rounded at the transition to the cross-sectional thickening because the angle of inclination of the fuel flow emerging from the fillet 18 with respect to the central axis 22 also becomes smaller.
  • a circumferential edge 34 is provided between the fillet 18 and the cross-sectional thickening 20, on which adjoining outer peripheral surface sections 36, 38 of the fillet 18 and the cross-sectional thickening 20 enclose an obtuse angle ⁇ (FIG. 1), which is at least 200 degrees and preferably between Should be 220 degrees and 240 degrees.
  • the stall at the edge 34 causes the fuel to emerge from the fillet 18 at an angle of inclination to the central axis 22 which essentially corresponds to the angle of inclination of the peripheral surface section 36 adjacent to the edge 34 within the fillet 18.
  • this angle of inclination is chosen, more or less fuel is directed back in the direction of the valve gap 12 when the fuel flow impacts the opposite region of the inner wall 24 of the outflow bore 26.
  • this angle of inclination which is preferably between 20 and 60 degrees, the proportion of the fuel flowing back can therefore be set to such a value that cavitation damage immediately behind the valve seat 10 is prevented by a vortex formation, but on the other hand the vortex formation fertilizer does not affect the outflow of the fuel after it emerges from the valve gap 12.
  • the fuel flowing back along the inner wall 24 protects the latter up to immediately behind the valve gap 12 from damage caused by cavitation, which could otherwise be caused as a result of a pressure drop in the fuel when it emerges from the valve gap 12 into the annular space 30.
  • FIG. 2 shows a valve pin 6 in which the circumferential surface section 36 adjacent to the edge 34 within the fillet 18 is oriented at an inclination angle ⁇ of approximately 60 degrees to the central axis 22 of the valve pin 6, the fuel is therefore rather steeply directed onto the inner wall 24 3 and 4 show two valve bolts 6, in which this angle of inclination ⁇ is approximately 35 degrees and approximately 20 degrees, respectively, and therefore correspondingly less fuel with formation a vortex 34 is directed back in the direction of the valve gap 28.
  • the opposite inner wall 24 of the outflow bore 26 is provided with a small step 40 there.
  • this step 40 favors the deflection of part of the fuel flow in the direction of the valve gap 12.
  • the concave delimitation of the fillet 18 is circular in all of the exemplary embodiments, the radius of curvature not being less than 0.2 mm in order to enable inexpensive series production of the valve pin 6.
  • the fillet 18 preferably merges seamlessly into the sealing surface 8, as shown in all of the exemplary embodiments.
  • the sharp tear-off edge 34 on the other side of the fillet 18 can be produced inexpensively in a series production of the valve pin 6 by grinding the valve pin 6 to its final diameter on both sides of the cross-sectional thickening 20 during its finishing, but not in the area of the cross-sectional thickening 20 that the diameter existing there prior to the grinding finishing of the valve pin 6 is retained, which automatically leads to the formation of the tear-off edge 34 at the transition to the fillet 18.

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)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape (2) de pompe à injection de carburant, comportant un siège de soupape (8) formé dans un carter de soupape (4), et un élément de soupape (6) mobile dans le carter de soupape (4), présentant une surface joint (10) s'appuyant de façon étanche contre le siège de soupape (8) lorsque la soupape (2) est fermée, et limitant avec le siège de soupape (8) une fente de soupape (12) parcourue par du carburant lorsque la soupape (2) est ouverte. Pour éviter des dégâts de cavitation, l'élément de soupape (6) comporte une cannelure périphérique (18) située directement derrière la surface joint (10) dans le sens d'écoulement, à laquelle se joint un renflement périphérique de la section transversale (20) de l'élément de soupape (6).
EP04786716A 2003-11-05 2004-09-06 Soupape de pompe a injection de carburant Expired - Fee Related EP1682771B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10351680A DE10351680A1 (de) 2003-11-05 2003-11-05 Ventil für eine Kraftstoffeinspritzpumpe
PCT/DE2004/001994 WO2005045228A1 (fr) 2003-11-05 2004-09-06 Soupape de pompe a injection de carburant

Publications (2)

Publication Number Publication Date
EP1682771A1 true EP1682771A1 (fr) 2006-07-26
EP1682771B1 EP1682771B1 (fr) 2012-11-14

Family

ID=34559352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04786716A Expired - Fee Related EP1682771B1 (fr) 2003-11-05 2004-09-06 Soupape de pompe a injection de carburant

Country Status (7)

Country Link
US (1) US20070119991A1 (fr)
EP (1) EP1682771B1 (fr)
JP (1) JP2006526729A (fr)
KR (1) KR101100973B1 (fr)
CN (1) CN1875184B (fr)
DE (1) DE10351680A1 (fr)
WO (1) WO2005045228A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4720724B2 (ja) * 2006-11-13 2011-07-13 トヨタ自動車株式会社 燃料噴射弁
DE102010043360A1 (de) * 2010-11-04 2012-05-10 Robert Bosch Gmbh Kraftstoffinjektor
DE102011004993A1 (de) * 2011-03-02 2012-09-06 Robert Bosch Gmbh Ventileinrichtung zum Schalten oder Zumessen eines Fluids
DE102012218667B4 (de) * 2012-10-12 2014-06-05 Continental Automotive Gmbh Magnetventil
JP6224415B2 (ja) * 2013-10-29 2017-11-01 日立オートモティブシステムズ株式会社 高圧燃料供給ポンプ
JP6781661B2 (ja) * 2017-04-20 2020-11-04 ボッシュ株式会社 燃料噴射装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952816A (en) * 1931-04-04 1934-03-27 Bendix Res Corp Fuel injector
US4503884A (en) * 1982-06-22 1985-03-12 Spils Richard W Angle globe valve
EP0178427B1 (fr) * 1984-09-14 1990-12-27 Robert Bosch Gmbh Pompe d'injection de carburant commandée par électricité pour moteurs à combustion interne
US4941508A (en) * 1989-12-28 1990-07-17 Dana Corporation Force balanced hydraulic spool valve
DE19619523A1 (de) 1996-05-15 1997-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Hochdruckeinspritzung
DE19940296A1 (de) 1999-08-25 2001-03-01 Bosch Gmbh Robert Ventil
DE10000501A1 (de) * 2000-01-08 2001-07-19 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
EP1118765A3 (fr) * 2000-01-19 2003-11-19 CRT Common Rail Technologies AG Injecteur de combustible pour moteur à combustion interne
DE10008554A1 (de) 2000-02-24 2001-08-30 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10031264A1 (de) * 2000-06-27 2002-01-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP2002039031A (ja) * 2000-07-10 2002-02-06 Robert Bosch Gmbh 後置された圧力制御エレメントを備えた、燃料を噴射するためのインジェクタ
DE10134526B4 (de) * 2001-07-16 2007-10-11 Robert Bosch Gmbh Schaltventil für Kraftstoffeinspritzsystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005045228A1 *

Also Published As

Publication number Publication date
JP2006526729A (ja) 2006-11-24
CN1875184A (zh) 2006-12-06
US20070119991A1 (en) 2007-05-31
WO2005045228A1 (fr) 2005-05-19
CN1875184B (zh) 2011-04-06
DE10351680A1 (de) 2005-06-09
KR101100973B1 (ko) 2011-12-29
KR20060108655A (ko) 2006-10-18
EP1682771B1 (fr) 2012-11-14

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