EP1013919A2 - Kraftstoffeinspritzventil - Google Patents
Kraftstoffeinspritzventil Download PDFInfo
- Publication number
- EP1013919A2 EP1013919A2 EP99124112A EP99124112A EP1013919A2 EP 1013919 A2 EP1013919 A2 EP 1013919A2 EP 99124112 A EP99124112 A EP 99124112A EP 99124112 A EP99124112 A EP 99124112A EP 1013919 A2 EP1013919 A2 EP 1013919A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- diffuser
- fuel
- pressure
- fuel 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.)
- Granted
Links
Images
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
-
- 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
-
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
Definitions
- the invention relates to a fuel injection valve according to the preamble of the patent claim from, as is known from EP-0 690 223 A2.
- the present invention is therefore based on the problem of a fuel injection valve for high pressure injection of fuel from a central high pressure line to create in combustion chambers, in which the opening and closing process of the Switch valve and the fuel flow through the switch valve as accurately as possible becomes controllable.
- the fuel valve according to the invention with the features of claim 1 has the Advantage that the hydraulic flow through the switching valve even at low Rail pressure and small valve lift can be precisely specified. To do this, the flow is ahead the switching valve with a specially designed throttle geometry expanded. After the contraction through the throttle inlet, the fuel flow spreads in the throttle geometry according to the invention in the direction of the throttle wall that the hydraulic flow through the optimal pressure difference at the valve is increased and the opening movement of the valve ball is supported away from the valve seat.
- the flow resistance is reduced, so that even with a small switching valve stroke and a small rail pressure it becomes high Flow comes.
- the high flow rate leads to a higher flow in the throttle Flow velocity.
- the diameter of the diffuser is at Transition to the cone seat only slightly more than the seat diameter. Thereby the largest possible hydraulic cross section of the valve when lifting the Valve ball reached.
- the fuel injection valve has a housing 2 on that with a connection 3 for supplying brought to injection pressure Fuel from a high-pressure fuel reservoir not shown is connected.
- An injection valve needle 5 is arranged in the housing 2 of the fuel injection valve, which has a guide section 6, which is located within the pressure chamber 7 lying shoulder in a smaller diameter part 9 of the injector needle transforms. At the end of this part 9, which is smaller in diameter, it has one conical sealing surface 10, which cooperates with a valve seat 11 and thereby Injection openings 12 opens or closes depending on the position of the injection valve needle.
- the pressure chamber 7 is permanently connected to the connection 3 via a pressure line 4, so that the pressure chamber 7 is constantly under high injection pressure.
- the needle 5 will controlled via the pressure piece 21 and the control piston 13.
- the control piston is immersed in a cylinder 14 in which it includes a control pressure chamber 15 at the end. This is in constant connection with connection 3 via a throttle bore 16.
- a throttle bore 17 leads from the control pressure chamber 15, the outlet thereof opens into a relief chamber 18 via an electric valve 19.
- the flow through the throttle bore 17 is controlled via the electric valve 19.
- the relief room is connected to a return via an outlet connection 20 on the housing 2.
- the fuel injection valve described above is supplied with high pressure from the high-pressure fuel reservoir via connection 3. This strives to raise the fuel injection valve needle 5 in action on the shoulder 9, so that fuel can flow from the pressure chamber 7 along the smaller diameter part 9 of the injection valve needle to the injection openings 12 and exit there.
- This opening is counteracted by the spring 18, which alone is not sufficient, however, to hold the injection valve needle 5 in the firing position when the fuel pressure is high in the pressure chamber 7, but does so in the absence of high fuel pressure.
- the task of closing continues to be carried out by the pressure in the control pressure chamber 15, which is the same as the pressure in the pressure chamber 7 when the electrically operated valve 19 is closed. Because of the larger end face of the control piston 14, the closing force predominates and the valve remains closed.
- the electrically operated valve 19 is opened so that the pressure chamber 15 is decoupled from the throttle bore 16 and thus the opening force on the shoulder 8 predominates.
- the electrically operated valve 10 is closed again.
- 2 shows the two embodiments of the invention in section.
- the upper part shows an embodiment with a throttle bore 31 which widens conically in the flow direction up to the conical seat of the ball valve 50.
- the cone angles ⁇ are designed for maximum pressure recovery in the flow.
- the lower part shows an embodiment in which the throttle bore 17, which widens conically in the flow direction with the angle ⁇ , and two diffusors 30 and 40 connected in series, also produce maximum pressure recovery.
- the fuel flows from the pressure chamber 15 into the throttle bore 17 or 31 and gaining speed.
- the static pressure in the flow is present in the area of the diffuser 30 the wall (see schematic representation of the fuel flow by arrows in Fig. 1), expands and is braked at the same time.
- the second diffuser 40 amplifies this process, causing the static pressure within the flow in Flow direction increases.
- This increased static pressure supports opening of the switching valve, the movement of the valve ball 50 in the direction of flow and accelerates hence the increase in fuel flow through the switching valve.
- the increased fuel flow increases the tendency to cavitation at the beginning of the throttle.
- the diameter of the second Diffuser 40 is only slightly smaller than the diameter of the valve seat line 52. This causes the valve ball 50 to move in the direction of flow (cf. double arrow in Fig. 1) released a maximum flow cross-section.
- the throttle bore 15 is slightly tapered in the direction of flow and preferably has a cone angle ⁇ of up to 5 °
- the throttle bore 17 are the two Diffusers 30, 40 or 31 and the valve seat 51 are collinearly aligned and form a total a funnel, the wider opening of which is closed by the valve ball 50 or is opened.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- Fig. 1:
- eine Schnittansicht eines gesamten Common Rail Injektors; und
- Fig. 2
- die beiden Ausführungsformen der Erfindung.
In Fig. 2 sind die beiden Ausführungsformen der Erfindung im Schnitt gezeigt. Der obere Teil zeigt eine Ausführungsform mit einer sich in Strömungsrichtung konisch bis zum Kegelsitz des Kugelventils 50 erweiternden Drosselbohrung 31. Die Konuswinkel α werden auf maximalen Druckrückgewinn in der Strömung ausgelegt. Der untere Teil zeigt eine Ausführungsform bei ebenfalls durch die sich in Strömungsrichtung konisch mit dem Winkel α erweiternde Drosselbohrung 17 und zwei in Reihe geschaltene Diffüsoren 30 und 40 maximaler Druckrüickgewinn erzeugt wird.
Claims (5)
- Kraftstoffeinspritzventil für eine Hochdruckeinspritzung von Kraftstoff aus einer zentralen Hochdruckleitung in Brennräume einer Verbrennungskraftmaschine, das ein Schaltventil (19) mit einem Ventilsitz (51) und einer Ventilkugel (50) umfaßt, wobei die Ventilkugel (50) in geöffnetem Zustand, der von einem mit einer zentralen Hochdruckleitung in Wirkverbindung stehenden Druckraum (15) aus einer Drosselbohrung (17 oder 31) gespeist ist, vom Ventilsitz (51) abgehoben ist,
dadurch gekennzeichnet, daß
der Übergang vom Drosseleinlauf zum Ventilsitz (51) als Diffusor ausgebildet ist. - Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß der Diffusor als konischer Diffusor (31), als Stufendiffusor (30, 40) oder als Kombination aus beiden ausgebildet ist, wobei der Diffusor so ausgebildet ist, daß sich die Kraftstoffströmung im wesentlichen an deren Wandung anlegt.
- Kraftstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Durchmesser beim Übergang in den Sitzkegel vorzugsweise nur geringfügig kleiner als der Sitzdurchmesser (51) ist.
- Kraftstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Diffusor so ausgebildet ist, daß sich die Strömung an die Wand anlegt und ein möglichst großer Druckrückgewinn erreichbar ist.
- Kraftstoffeinspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Drosselbohrung, der gesamte Diffusor (40) und der Ventilsitz (51) einen Trichter ausbilden, gegenüber dessen Zentrumsöffnung die Ventilkugel bewegbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19859537 | 1998-12-22 | ||
DE19859537A DE19859537A1 (de) | 1998-12-22 | 1998-12-22 | Kraftstoffeinspritzventil |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1013919A2 true EP1013919A2 (de) | 2000-06-28 |
EP1013919A3 EP1013919A3 (de) | 2002-02-13 |
EP1013919B1 EP1013919B1 (de) | 2004-10-20 |
Family
ID=7892302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99124112A Expired - Lifetime EP1013919B1 (de) | 1998-12-22 | 1999-12-02 | Kraftstoffeinspritzventil |
Country Status (4)
Country | Link |
---|---|
US (1) | US6276335B1 (de) |
EP (1) | EP1013919B1 (de) |
JP (1) | JP2000186647A (de) |
DE (2) | DE19859537A1 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002014682A1 (de) * | 2000-08-11 | 2002-02-21 | Robert Bosch Gmbh | Sitzventilanordnung, insbesondere für ein kraftstoffeinspritzsystem einer verbrennungsmaschine |
WO2008012133A1 (de) * | 2006-07-24 | 2008-01-31 | Robert Bosch Gmbh | Servoventilgesteuerter injektor zur einspritzung von kraftstoff in zylinderbrennräume von brennkraftmaschinen; insbesondere common-rail-injektor |
WO2008092711A1 (de) * | 2007-01-30 | 2008-08-07 | Robert Bosch Gmbh | Kugelsitzventil mit verringertem erosionsverhalten |
WO2010060706A1 (de) * | 2008-11-27 | 2010-06-03 | Robert Bosch Gmbh | Verfahren zur herstellung von drosselbohrungen mit niedrigem kavitationsumschlagpunkt |
WO2012084682A1 (de) * | 2010-12-22 | 2012-06-28 | Continental Automotive Gmbh | Magnetodynamischer aktor und verfahren zur betätigung eines kraftstoffeinspritzventils |
EP2290272A3 (de) * | 2009-08-27 | 2013-08-21 | Robert Bosch GmbH | Kavitationserosionsoptimiertes Kugelsitzventil |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10007175B9 (de) * | 2000-02-17 | 2004-11-04 | Siemens Ag | Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine |
JP2003113761A (ja) | 2001-08-01 | 2003-04-18 | Denso Corp | 燃料噴射弁 |
DE10152173A1 (de) * | 2001-10-23 | 2003-04-30 | Bosch Gmbh Robert | Magnetventil zur Steuerung eines Einspritzventils |
US7111614B1 (en) | 2005-08-29 | 2006-09-26 | Caterpillar Inc. | Single fluid injector with rate shaping capability |
JP5051279B2 (ja) * | 2009-12-21 | 2012-10-17 | 株式会社デンソー | 定残圧弁 |
DE102013214589A1 (de) * | 2013-07-25 | 2015-01-29 | Robert Bosch Gmbh | Schaltventil für einen Kraftstoffinjektor |
DE102015204255A1 (de) * | 2015-03-10 | 2016-09-15 | Robert Bosch Gmbh | Kraftstoffinjektor für ein Kraftstoffeinspritzsystem |
FR3055370B1 (fr) * | 2016-09-01 | 2020-05-01 | Delphi Technologies Ip Limited | Ensemble de bobine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2316447A (en) * | 1996-08-23 | 1998-02-25 | Daimler Benz Ag | I.c. engine common rail fuel injection valve |
EP0851115A1 (de) * | 1996-12-23 | 1998-07-01 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | Elektromagnetisches Dosierventil mit kugelförmigem Abschliesselement für Kraftstoffeinspritzventil |
US5806766A (en) * | 1996-05-08 | 1998-09-15 | Siemens Aktiengesellschaft | Injection valve |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1250900B (it) * | 1991-12-24 | 1995-04-21 | Elasis Sistema Ricerca Fiat | Valvola di iniezione del combustibile a comando elettromagnetico. |
CH689282A5 (de) * | 1994-03-29 | 1999-01-29 | Christian Dipl-Ing Eth Mathis | Einspritzventil fuer eine insbesondere als Dieselmotor vorgesehene Brennkraftmaschine. |
IT232490Y1 (it) * | 1994-07-01 | 2000-01-10 | Elasis Sistema Ricerca Fiat | Dispositivo di registrazione della corsa dell'otturatore per un iniettore di combustibile |
EP0745764B1 (de) * | 1995-06-02 | 2001-03-21 | Ganser-Hydromag Ag | Brennstoffeinspritzventil für Verbrennungskraftmaschinen |
DE19624001A1 (de) * | 1996-06-15 | 1997-12-18 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
US5890653A (en) * | 1998-04-23 | 1999-04-06 | Stanadyne Automotive Corp. | Sensing and control methods and apparatus for common rail injectors |
DE19822503C1 (de) * | 1998-05-19 | 1999-11-25 | Siemens Ag | Steuerventil für Kraftstoffeinspritzventil |
JP3704957B2 (ja) * | 1998-07-06 | 2005-10-12 | いすゞ自動車株式会社 | インジェクタ |
-
1998
- 1998-12-22 DE DE19859537A patent/DE19859537A1/de not_active Ceased
-
1999
- 1999-12-02 EP EP99124112A patent/EP1013919B1/de not_active Expired - Lifetime
- 1999-12-02 DE DE59910896T patent/DE59910896D1/de not_active Expired - Lifetime
- 1999-12-17 US US09/465,843 patent/US6276335B1/en not_active Expired - Fee Related
- 1999-12-22 JP JP11365139A patent/JP2000186647A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5806766A (en) * | 1996-05-08 | 1998-09-15 | Siemens Aktiengesellschaft | Injection valve |
GB2316447A (en) * | 1996-08-23 | 1998-02-25 | Daimler Benz Ag | I.c. engine common rail fuel injection valve |
EP0851115A1 (de) * | 1996-12-23 | 1998-07-01 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | Elektromagnetisches Dosierventil mit kugelförmigem Abschliesselement für Kraftstoffeinspritzventil |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002014682A1 (de) * | 2000-08-11 | 2002-02-21 | Robert Bosch Gmbh | Sitzventilanordnung, insbesondere für ein kraftstoffeinspritzsystem einer verbrennungsmaschine |
WO2008012133A1 (de) * | 2006-07-24 | 2008-01-31 | Robert Bosch Gmbh | Servoventilgesteuerter injektor zur einspritzung von kraftstoff in zylinderbrennräume von brennkraftmaschinen; insbesondere common-rail-injektor |
WO2008092711A1 (de) * | 2007-01-30 | 2008-08-07 | Robert Bosch Gmbh | Kugelsitzventil mit verringertem erosionsverhalten |
CN101595297B (zh) * | 2007-01-30 | 2013-10-30 | 罗伯特·博世有限公司 | 具有降低的腐蚀特性的球座阀 |
WO2010060706A1 (de) * | 2008-11-27 | 2010-06-03 | Robert Bosch Gmbh | Verfahren zur herstellung von drosselbohrungen mit niedrigem kavitationsumschlagpunkt |
US8881400B2 (en) | 2008-11-27 | 2014-11-11 | Robert Bosch Gmbh | Method for producing throttle holes having a low cavitation transmission point |
EP2290272A3 (de) * | 2009-08-27 | 2013-08-21 | Robert Bosch GmbH | Kavitationserosionsoptimiertes Kugelsitzventil |
WO2012084682A1 (de) * | 2010-12-22 | 2012-06-28 | Continental Automotive Gmbh | Magnetodynamischer aktor und verfahren zur betätigung eines kraftstoffeinspritzventils |
Also Published As
Publication number | Publication date |
---|---|
EP1013919B1 (de) | 2004-10-20 |
DE59910896D1 (de) | 2004-11-25 |
JP2000186647A (ja) | 2000-07-04 |
EP1013919A3 (de) | 2002-02-13 |
US6276335B1 (en) | 2001-08-21 |
DE19859537A1 (de) | 2000-07-06 |
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