EP0812391B1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinen Download PDFInfo
- Publication number
- EP0812391B1 EP0812391B1 EP96924779A EP96924779A EP0812391B1 EP 0812391 B1 EP0812391 B1 EP 0812391B1 EP 96924779 A EP96924779 A EP 96924779A EP 96924779 A EP96924779 A EP 96924779A EP 0812391 B1 EP0812391 B1 EP 0812391B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve body
- head piece
- fuel injection
- sealing surface
- 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
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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
- F02M61/04—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
- F02M61/047—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 the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices
-
- 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
Definitions
- the invention relates to a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
- a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
- known fuel injector is the valve member fixed to the valve body and lies with a Valve sealing surface under axial preload on one Valve seat of the valve body.
- a membrane trained valve member is in the known Fuel injection valve is disc-shaped, wherein the radially outer area between a spacer sleeve and a clamping nut clamped against the valve body is.
- the membrane disc also has a central bore on whose ring edge facing the valve body Forms valve sealing surface with which the valve membrane on one conical valve seat surface, which rests on an axial Pin of the valve body is formed.
- a Pressure channel provided in the valve body with a Injection line of a fuel injection pump connected GB 100 445 also discloses a fuel injection valve known in which a membrane-shaped, circular valve member in the form of a head piece limits a pressure space, connected to a central inlet channel running in the valve body and can be filled with fuel under pressure.
- the head piece is resilient and rests under tension a valve sealing surface. The head piece becomes due to the fuel pressure lifted against its internal stress from the valve sealing surface and releases an injection cross section.
- the membrane-shaped head piece is fixed at its edge to the valve body by a clamping nut and formed in one piece without openings. and that in a limited by the valve membrane Pressure chamber opens.
- valve sealing surface on the valve seat of the Valve body adjacent valve member is during the Injection phase due to the high fuel pressure from the valve seat lifted off and gives an injection cross section in the Combustion chamber of the internal combustion engine to be supplied is free.
- the known fuel injection valve the disadvantage that due to the relatively complicated Construction and use of a variety of components Manufacture of the known fuel injection valve is complex and costly. It also needs that known fuel injector due to the variety of Components an increased space, especially on his end near the combustion chamber, which shows the installation flexibility at the Restricts internal combustion engine.
- Another disadvantage is the shape of the injection opening in the combustion chamber of the internal combustion engine to be supplied, the is ring-shaped in the known injection valve, which is an exact jet alignment of the injection jet difficult.
- the fuel injection valve according to the invention for internal combustion engines with the characterizing features of claim 1 has in contrast the advantage that by directly attaching the as Head piece trained valve member on the valve body by a Welded connection only two components are required. Through this the manufacturing and assembly costs can be very simple the fuel injector significantly reduce, so that the manufacturing cost over the known injector can be reduced. It’s not another fastener, for example a clamping nut, necessary to the valve member in the the intended location.
- the weld on the outer radial Edge of the head piece advantageously causes the valve member is resilient in the middle. To do the axial preload To reach the valve member, it is under high axial Contact pressure welded to the valve body.
- Another advantageous way of securing the axial preload is achieved by thermal treatment during assembly, at which the valve body heats up to a high temperature becomes. Now weld the cold head piece to the heated valve body at the lower end of the valve sealing surface facing away Head piece, turns up after cooling or temperature compensation between the components due to the contraction of the valve body the axial preload between the head piece and valve body on. This can be done either via the axial contact pressure or the Degree of thermal treatment during the assembly of the components adjust the axial preload force with which the head piece formed valve member bears on the valve seat of the valve body, what in turn directly determines the opening pressure at the injection valve. A further possibility of setting the opening pressure and the course the opening movement of the acting as a resilient membrane End face of the head piece is through the formation of this end face possible.
- the cone angle of the conical Valve seat surface and the conical valve sealing surface slightly deviate from each other so that a sealing edge seat is formed.
- the head piece is particularly advantageous to design the head piece as a pot-shaped one Form hollow body, the closed, the valve body facing End face forms the resilient membrane and that at its radial outer area is non-detachably connected to the valve body.
- Another advantage of the fuel injection valve according to the invention represents the provision of freely selectable injection openings, through which the jet position of the injected fuel is adjustable is.
- the head piece its radially outer area facing the valve body Face is welded to the valve body, the beam path by the cone angle of the valve sealing surface and the locations of the Interruptions in the circumferential weld seam determined.
- the cup-shaped Head piece is inserted into a receiving opening of the valve body, are the injection openings through freely selectable recesses in the Wall of the valve body in the area of the overlap with the valve sealing surface educated.
- Fuel injection valves for internal combustion engines are in of the drawing and are shown in the following Description explained in more detail.
- FIG. 1 shows a first exemplary embodiment in FIG 2 shows a longitudinal section through the injection valve
- FIG. 2 shows an enlarged section from FIG. 1 a section through the injection valve of Figure 2 along the valve seat surface of the valve body
- the figure 4 a second embodiment analogous to the representation of the figure 2
- Figure 5 shows a section through the valve body of the Figure 4 along the injection openings and Figures 6A up to 6F different design options for the head piece of the two embodiments.
- the first embodiment shown in Figure 1 has a preferably rotationally symmetrical valve body 1 on which in the combustion chamber of the to be supplied Internal combustion engine protruding lower end one Valve member forming head 3 is attached.
- Valve body 1 On his Valve body 1 has an upper end remote from the combustion chamber Pipe connection 5 to which one, the valve body 1 in Longitudinal penetrating pressure channel 7 connects at the end of the valve body 1 near the combustion chamber at its lower end End face opens.
- valve seat surface 9 which is conical is trained.
- valve seat surface 9 acts upper end face of the valve body 1 Head piece 3 together, which has a valve sealing surface 11 forms, which is also conical.
- valve sealing surface 11 forms, which is also conical.
- the head piece 3 In order to form a resilient valve member, the head piece 3 on its outer radial edge of the valve body 1 facing end face 11 forming the valve sealing face with the lower end of the valve body on the combustion chamber side 1 welded.
- the head 3 is during the Welding at high pressure axially against the valve body 1 pressed so that the valve sealing surface 11 under tension rests on valve seat 9.
- the two components are welded together not over the entire scope, but as in the Figure 3 shown on several, four in the embodiment Areas interrupted.
- These recesses 15 the circumferential weld 17 form the Injection ports through which the fuel enters the combustion chamber the internal combustion engine emerges.
- the injection jet angle is determined by the cone angle of the conical valve seat and valve sealing surface 9, 11 and the jet width through the Width of the recesses 15 predetermined.
- Exemplary embodiment has the valve body 1 on its lower receiving end projecting into the combustion chamber 21, in which the head piece 3 is fully inserted.
- the upper end face of the head piece 3 forms again a valve sealing surface 11 and the lower ring end face of the Valve body 1 a valve seat 9, which also are conical and slightly different have a different cone angle.
- the educated can Sealing edge 13 in the second embodiment both inside as well as being located outside.
- valve body 1 is heated to a high temperature, then the cold head piece 3 in the receiving opening 21 of the Valve body 1 used and when the Valve sealing surface 11 on the valve seat 9 on the lower, end facing the combustion chamber with the wall of the receiving opening 21 of the valve body 1 welded. After this Temperature compensation of the two components 1, 3 results due to the contraction of the valve body 1 when Cooling an axial bracing of the head piece 3 against the Valve body 1.
- the injection openings are, as in FIG. 5 removable, in the second embodiment as Recesses 23 formed in the wall of the valve body 1, over the coverage area with the Extend valve sealing surface 11 and their arrangement and geometric shape shape the injection jet.
- Head piece 3 as shown in Figures 6A to 6F as Hollow body formed. Only FIG. 6B shows one Design variant of the head piece 3 as a funnel-shaped Disc, the use of which however only in the first, in the Figures 1 to 3 embodiment shown advantageous is.
- the fuel injection valve for internal combustion engines works in the following way: At the beginning of the injection phase, fuel under high pressure flows via the injection line into the pressure channel 7 and acts on the valve sealing surface 11 of the head piece 3 in the opening direction. From a certain fuel pressure, the compressive force acting in the opening direction exceeds the pretensioning force on the head piece 3, with which the valve sealing surface 11 is braced axially against the valve seat 9, and the valve sealing surface 11 lifts resiliently from the valve seat 9.
- the fuel flows in the first exemplary embodiment into the annular gap between the valve seat surface 9 and the valve sealing surface 11 and exits at the cutouts 15 of the weld seam 17 into the combustion chamber of the internal combustion engine.
- the fuel flows to the recesses 23 in the wall of the valve body 1 and from there into the combustion chamber.
- the inventive works Fuel injector very quickly and reliably because almost no moving masses occur.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Am Beginn der Einspritzphase strömt unter hohem Druck stehender Kraftstoff über die Einspritzleitung in den Druckkanal 7 und beaufschlagt die Ventildichtfläche 11 des Kopfstückes 3 in Öffnungsrichtung. Dabei übersteigt ab einem bestimmten Kraftstoffdruck die in Öffnungsrichtung wirkende Druckkraft die Vorspannkraft am Kopfstück 3, mit der die Ventildichtfläche 11 axial gegen den Ventilsitz 9 verspannt ist und die Ventildichtfläche 11 hebt federnd vom Ventilsitz 9 ab. In Folge des geöffneten Querschnitts am Dichtsitz strömt der Kraftstoff im ersten Ausführungsbeispiel in den Ringspalt zwischen der Ventilsitzfläche 9 und der Ventildichtfläche 11 und tritt an den Aussparungen 15 der Schweißnaht 17 in den Brennraum der Brennkraftmaschine aus. Im zweiten Ausführungsbeispiel strömt der Kraftstoff nach Passieren des geöffneten Dichtquerschnitts zu den Ausnehmungen 23 in der Wand des Ventilkörpers 1 und gelangt von dort in den Brennraum.
Claims (9)
- Kraftstoffeinspritzventil für Brennkraftmaschinen mit einem Ventilkörper (1), an dessen brennraumseitigen Ende eine Ventilsitzfläche (9) vorgesehen ist, an der ein ortsfest gegenüber dem Ventilkörper (1) angeordnetes als Kopfstück (3) ausgebildetes Ventilglied unter axialer Vorspannung mit einer Ventildichtfläche (11) anliegt, wobei die dem Ventilkörper (1) zugewandte Stirnfläche des Kopfstücks (3) die Ventildichtfläche (11) bildet, mit einem den Ventilkörper (1) in Längsrichtung durchdringenden Druckkanal (7), der in einen vom Ventilsitz (9) begrenzten, die Stirnfläche des Kopfstücks (3) in Öffnungsrichtung beaufschlagenden Druckraum mündet, und mit wenigstens einer sich stromabwärts an die Ventilsitzfläche (9) anschließenden Einspritzöffnung in den Brennraum der zu versorgenden Brennkraftmaschine, dadurch gekennzeichnet, daß das Kopfstück (3) an seinem äußeren radialen Rand durch eine Schweißverbindung unlösbar direkt am brennraumseitiger Ende des Ventilkörpers (1) befestigt ist.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß das Kopfstück (3) im Bereich der Ventildichtfläche (11) als federnde Membran ausgebildet ist, die unter Beaufschlagung mit Kraftstoffhochdruck vom Ventilsitz (9) abhebbar ist.
- Kraftstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß das Kopfstück (3) als Hohlkörper ausgebildet ist, dessen dem Ventilkörper (1) zugewandte geschlossene Stirnfläche die Ventildichtfläche (11) bildet.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Ventilsitzfläche (9) am Ventilkörper (1) und die Ventildichtfläche (11) am Kopfstück (3) konisch ausgebildet sind.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß das Kopfstück (3) am radial äußeren Bereich seiner dem Ventilkörper (1) zugewandten Stirnfläche (11) mit der brennraumseitigen, die Ventilsitzfläche (9) bildenden Stirnfläche des Ventilkörpers (1) verschweißt ist.
- Kraftstoffeinspritzventil nach Anspruch 5, dadurch gekennzeichnet, daß die umlaufende Schweißnaht (17) eine Vielzahl von Aussparungen (15) aufweist, die bei Abheben der Ventildichtfläche (11) vom Ventilsitz (9) eine Einspritzöffnung bilden.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß das Kopfstück (3) in eine Aufnahmeöffnung (21) am brennraumseitigen Ende des Ventilkörpers (1) eingesetzt ist, wobei im Bereich der Überdeckung mit der Ventildichtfläche (11) des Kopfstückes (3) Ausnehmungen (23) in der Wand des Ventilkörpers (1) vorgesehen sind, die die Einspritzöffnungen bilden.
- Kraftstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß das Kopfstück (3) an seiner unteren brennraumseitigen Kante zwischen der Mantelfläche und der unteren Ringstirnfläche mit der Wand der Aufnahmeöffnung (21) des Ventilkörpers (1) verschweißt ist.
- Verfahren zum Herstellen eines Kraftstoffeinspritzventils nach Anspruch 7, gekennzeichnet durch folgende Verfahrensschritte:Erhitzen des Ventilkörpers (1) auf eine hohe TemperaturEinsetzen des kalten Kopfstückes (3) in die Aufnahmeöffnung (21) des Ventilkörpers (1)Verschweißen des Kopfstückes (3) in der Aufnahmeöffnung (21) des Ventilkörpers (1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19547169A DE19547169A1 (de) | 1995-12-16 | 1995-12-16 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19547169 | 1995-12-16 | ||
PCT/DE1996/001409 WO1997022800A1 (de) | 1995-12-16 | 1996-07-30 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0812391A1 EP0812391A1 (de) | 1997-12-17 |
EP0812391B1 true EP0812391B1 (de) | 2001-11-07 |
Family
ID=7780409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96924779A Expired - Lifetime EP0812391B1 (de) | 1995-12-16 | 1996-07-30 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0812391B1 (de) |
JP (1) | JPH11501101A (de) |
KR (1) | KR19980702177A (de) |
BR (1) | BR9607297A (de) |
DE (2) | DE19547169A1 (de) |
WO (1) | WO1997022800A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006003668A1 (de) * | 2006-01-26 | 2007-08-02 | Bayerische Motoren Werke Ag | Brennstoffeinspritzventil mit nach aussen öffnender Düsennadel |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB100445A (en) * | 1915-05-07 | 1917-01-25 | Oscar Robert Groenkwist | Means for Injecting Liquid Fuel, and other Liquids into Explosions Motors, Furnaces, and the like. |
GB565999A (en) * | 1943-06-03 | 1944-12-07 | Henry Franz Pulitzer | Improvements in or relating to atomising nozzles for liquids |
JPS62255571A (ja) * | 1986-04-30 | 1987-11-07 | Nippon Denso Co Ltd | 燃料噴射ノズル |
DE9320433U1 (de) * | 1993-04-10 | 1994-09-29 | Robert Bosch Gmbh, 70469 Stuttgart | Kraftstoffeinspritzdüse für Brennkraftmaschinen |
-
1995
- 1995-12-16 DE DE19547169A patent/DE19547169A1/de not_active Withdrawn
-
1996
- 1996-07-30 BR BR9607297A patent/BR9607297A/pt not_active IP Right Cessation
- 1996-07-30 JP JP9522401A patent/JPH11501101A/ja not_active Ceased
- 1996-07-30 EP EP96924779A patent/EP0812391B1/de not_active Expired - Lifetime
- 1996-07-30 KR KR1019970705572A patent/KR19980702177A/ko active IP Right Grant
- 1996-07-30 WO PCT/DE1996/001409 patent/WO1997022800A1/de active IP Right Grant
- 1996-07-30 DE DE59608147T patent/DE59608147D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19547169A1 (de) | 1997-06-19 |
JPH11501101A (ja) | 1999-01-26 |
DE59608147D1 (de) | 2001-12-13 |
WO1997022800A1 (de) | 1997-06-26 |
BR9607297A (pt) | 1997-11-25 |
EP0812391A1 (de) | 1997-12-17 |
KR19980702177A (ko) | 1998-07-15 |
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