EP0370659A1 - Kraftstoffeinspritzdüse - Google Patents
Kraftstoffeinspritzdüse Download PDFInfo
- Publication number
- EP0370659A1 EP0370659A1 EP89311599A EP89311599A EP0370659A1 EP 0370659 A1 EP0370659 A1 EP 0370659A1 EP 89311599 A EP89311599 A EP 89311599A EP 89311599 A EP89311599 A EP 89311599A EP 0370659 A1 EP0370659 A1 EP 0370659A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- orifice
- fuel
- seating
- valve member
- nozzle
- 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
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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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1846—Dimensional characteristics of discharge orifices
Definitions
- This invention relates to fuel injection nozzles for supplying fuel to compression ignition engines and comprising a valve member slidable within a bore formed in a nozzle body, a seating defined at one end of the bore, the valve member being shaped for cooperation with the seating to prevent fuel flow through an outlet orifice, the valve member when lifted from the seating allowing fuel flow through the outlet orifice from a fuel inlet.
- Fuel injection nozzles of the aforesaid type are well known in the art and in most cases the outlet orifice extends from a small cavity known as the "sac" volume which is downstream of the seating.
- the "sac" volume is usually formed in an integral projection or tip of the body of the nozzle and the axis of the orifice is often inclined to the axis of the nozzle body.
- the orifice extends from the seating so that when the valve member is in the closed position the inner end of the orifice is covered by the valve member.
- the nature of the fuel spray which develops as the fuel leaves the orifice has a bearing on the combustion of fuel in the engine combustion chamber and therefore the engine performance and the level of smoke in the engine exhaust. In some engines enhanced performance and smoke reduction may be obtained by having a more penetrating spray.
- the object of the invention is to provide in a fuel injection nozzle of the kind specified, a convenient way of modifying the form of spray which issues from the orifice.
- the tip 10 of a conventional inwardly opening fuel injection nozzle the tip defining a "sac" volume 11 located downstream of a frusto conical seating 12 with which can cooperate the end of a valve member 13.
- the valve member is slidable in a bore 9 formed in a nozzle body 8 and it defines an annular area 7 against which fuel under pressure can act to lift the valve member away from the seating against the action of resilient means 6.
- fuel under pressure can flow from a nozzle inlet 5 into the "sac" volume 11 and then through one or more orifices 14 extending through the wall of the tip 10.
- the diameter of the orifice is constant throughout its length.
- the fuel spray which issues from the orifice will tend to diverge but will have moderate penetration.
- the flow of fuel as it flows through the orifice tends to contract to a smaller diameter, the contraction being termed the "vena contracta" and this contraction is shown in Figure 2 at 15.
- the inevitable separation of the fuel from the wall of the orifice causes cavities to form in the fuel which assist the atomization of the fuel.
- the radius RA in the region of greatest separation should lie between 0.15 and 0.75, preferably between 0.3 and 0.75 of the diameter of the orifice and ideally 0.5 of the diameter of the orifice.
- the radius RB in the region of least separation should be up to 0.75, preferably between 0.05 and 0.2 and ideally 0.1 of the diameter of the orifice.
- Figure 4 illustrates a nozzle in which the orifice 17 extends from the seating 18 below the seatline so that in the closed position of the valve member the entrance to the orifice is closed by the valve member.
- the same shaping of the entrance to the orifice is effected as is the case with the example shown in Figure 3.
- the axis of the axis is so arranged that it is at right angles to the seating then the entrance conditions will be substantially the same all the way around the seating.
- the nozzle will tend to have a number of orifices so that whatever the angle of the orifice relative to the seating the differences in the entrance conditions will remain.
- the nozzle shown in Figure 5 has a valve member 19 which includes an obturator 20 which is partly located within the "sac" volume.
- the obturator has a clearance with the surface of the wall defining the "sac" volume so as to provide an annular area through which fuel can flow, the area providing a restriction to the flow of fuel at least during the initial stage of lift of the valve member.
- the invention is also applicable to fuel injection nozzles of the so called two stage lift type as seen in Figure 4 in which at the end of the first stage of lift the annular area 21 of the flow passage within the nozzle e.g. as formed between the valve member and the seating, is less than the flow area of the orifice or orifices.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8827107 | 1988-11-19 | ||
GB888827107A GB8827107D0 (en) | 1988-11-19 | 1988-11-19 | Fuel injection nozzle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0370659A1 true EP0370659A1 (de) | 1990-05-30 |
EP0370659B1 EP0370659B1 (de) | 1992-12-30 |
Family
ID=10647154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890311599 Expired EP0370659B1 (de) | 1988-11-19 | 1989-11-09 | Kraftstoffeinspritzdüse |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0370659B1 (de) |
DE (1) | DE68904172T2 (de) |
ES (1) | ES2037962T3 (de) |
GB (1) | GB8827107D0 (de) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19507171C1 (de) * | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19507188C1 (de) * | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
EP0809017A1 (de) * | 1996-05-22 | 1997-11-26 | Steyr-Daimler-Puch Aktiengesellschaft | Zweistufige Kraftstoffeinspritzdüse für Brennkraftmaschinen |
EP0890735A2 (de) | 1997-07-11 | 1999-01-13 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
FR2796104A1 (fr) * | 1999-07-08 | 2001-01-12 | Siemens Ag | Corps d'injecteur presentant une geometrie optimale d'orifice d'injection et procede pour arrondir les aretes d'un tel orifice |
WO2001004490A1 (de) * | 1999-07-08 | 2001-01-18 | Robert Bosch Gmbh | Sackloch-einspritzdüse für brennkraftmaschinen mit abgerundetem übergang zwischen sackloch und düsennadelsitz |
WO2002063161A1 (de) * | 2001-02-08 | 2002-08-15 | Siemens Aktiengesellschaft | Kraftstoffeinspritzdüse für eine brennkraftmaschine |
WO2002095218A1 (de) * | 2001-05-21 | 2002-11-28 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
WO2005064150A1 (de) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
EP1312796A3 (de) * | 2001-11-15 | 2006-02-01 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
EP2009276A1 (de) * | 2007-06-26 | 2008-12-31 | Delphi Technologies, Inc. | Sprühlochprofil |
CN104929837A (zh) * | 2015-05-24 | 2015-09-23 | 北京工业大学 | 一种气液两态混合喷射的柴油喷油嘴 |
CN105332840A (zh) * | 2015-10-31 | 2016-02-17 | 北京工业大学 | 一种利用空化射流强化实现预混燃烧的方法 |
EP1644636B2 (de) † | 2003-07-04 | 2016-08-03 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für brennkraftmaschinen |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4103291B2 (ja) * | 2000-03-08 | 2008-06-18 | 株式会社デンソー | 燃料噴射ノズル |
DE10118164B4 (de) * | 2001-04-11 | 2007-02-08 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB611620A (en) * | 1945-11-13 | 1948-11-02 | Texaco Development Corp | Improvements in or relating to the operation of internal combustion engines having airless injection of fuel |
FR2335705A1 (fr) * | 1975-12-20 | 1977-07-15 | Kloeckner Humboldt Deutz Ag | Injecteur de carburant |
FR2352957A1 (fr) * | 1976-05-26 | 1977-12-23 | Sulzer Ag | Gicleur de soupape d'injection de carburant de moteur a combustion interne |
GB2170269A (en) * | 1985-01-26 | 1986-07-30 | Daimler Benz Ag | I.c. engine fuel injection valve |
-
1988
- 1988-11-19 GB GB888827107A patent/GB8827107D0/en active Pending
-
1989
- 1989-11-09 ES ES89311599T patent/ES2037962T3/es not_active Expired - Lifetime
- 1989-11-09 EP EP19890311599 patent/EP0370659B1/de not_active Expired
- 1989-11-09 DE DE1989604172 patent/DE68904172T2/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB611620A (en) * | 1945-11-13 | 1948-11-02 | Texaco Development Corp | Improvements in or relating to the operation of internal combustion engines having airless injection of fuel |
FR2335705A1 (fr) * | 1975-12-20 | 1977-07-15 | Kloeckner Humboldt Deutz Ag | Injecteur de carburant |
FR2352957A1 (fr) * | 1976-05-26 | 1977-12-23 | Sulzer Ag | Gicleur de soupape d'injection de carburant de moteur a combustion interne |
GB2170269A (en) * | 1985-01-26 | 1986-07-30 | Daimler Benz Ag | I.c. engine fuel injection valve |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6247655B1 (en) | 1995-03-02 | 2001-06-19 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
DE19507188C1 (de) * | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
EP0730089A1 (de) | 1995-03-02 | 1996-09-04 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
EP0730090A3 (de) * | 1995-03-02 | 1996-10-16 | Bosch Gmbh Robert | |
DE19507171C1 (de) * | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
US5875973A (en) * | 1995-03-02 | 1999-03-02 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engine |
EP0809017A1 (de) * | 1996-05-22 | 1997-11-26 | Steyr-Daimler-Puch Aktiengesellschaft | Zweistufige Kraftstoffeinspritzdüse für Brennkraftmaschinen |
US5934571A (en) * | 1996-05-22 | 1999-08-10 | Steyr-Daimler-Puch Aktiengesellschaft | Two-stage fuel-injection nozzle for internal combustion engines |
EP0890735A2 (de) | 1997-07-11 | 1999-01-13 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
EP0890735A3 (de) * | 1997-07-11 | 2001-10-10 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
FR2796104A1 (fr) * | 1999-07-08 | 2001-01-12 | Siemens Ag | Corps d'injecteur presentant une geometrie optimale d'orifice d'injection et procede pour arrondir les aretes d'un tel orifice |
US6695230B1 (en) | 1999-07-08 | 2004-02-24 | Robert Bosch Gmbh | Blind bore injection nozzle for internal combustion engines, with a rounded transition between the blind bore and the nozzle needle seat |
WO2001004490A1 (de) * | 1999-07-08 | 2001-01-18 | Robert Bosch Gmbh | Sackloch-einspritzdüse für brennkraftmaschinen mit abgerundetem übergang zwischen sackloch und düsennadelsitz |
WO2002063161A1 (de) * | 2001-02-08 | 2002-08-15 | Siemens Aktiengesellschaft | Kraftstoffeinspritzdüse für eine brennkraftmaschine |
WO2002095218A1 (de) * | 2001-05-21 | 2002-11-28 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
US7011257B2 (en) | 2001-05-21 | 2006-03-14 | Robert Bosch Gmbh | Fuel injection valve |
EP1312796A3 (de) * | 2001-11-15 | 2006-02-01 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
EP1644636B2 (de) † | 2003-07-04 | 2016-08-03 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für brennkraftmaschinen |
WO2005064150A1 (de) * | 2003-12-29 | 2005-07-14 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
EP2009276A1 (de) * | 2007-06-26 | 2008-12-31 | Delphi Technologies, Inc. | Sprühlochprofil |
CN104929837A (zh) * | 2015-05-24 | 2015-09-23 | 北京工业大学 | 一种气液两态混合喷射的柴油喷油嘴 |
CN104929837B (zh) * | 2015-05-24 | 2017-08-11 | 北京工业大学 | 一种气液两态混合喷射的柴油喷油嘴 |
CN105332840A (zh) * | 2015-10-31 | 2016-02-17 | 北京工业大学 | 一种利用空化射流强化实现预混燃烧的方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0370659B1 (de) | 1992-12-30 |
ES2037962T3 (es) | 1993-07-01 |
DE68904172D1 (de) | 1993-02-11 |
DE68904172T2 (de) | 1993-07-15 |
GB8827107D0 (en) | 1988-12-21 |
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