EP0370659B1 - Fuel injection nozzle - Google Patents
Fuel injection nozzle Download PDFInfo
- Publication number
- EP0370659B1 EP0370659B1 EP19890311599 EP89311599A EP0370659B1 EP 0370659 B1 EP0370659 B1 EP 0370659B1 EP 19890311599 EP19890311599 EP 19890311599 EP 89311599 A EP89311599 A EP 89311599A EP 0370659 B1 EP0370659 B1 EP 0370659B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- orifice
- fuel
- seating
- valve member
- radius
- 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
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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 blind bore formed in a nozzle body, a seating defined at the blind end of the bore, the valve member being shaped for cooperation with the seating at a seatline 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 at a position downstream of the seatline 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.
- FR-A-2335705 discloses a fuel injection nozzle having the features mentioned in the preamble of Claim 1 and in particular outlet orifices which extend from the "sac" volume, the entrance to the orifices from the "sac” volume having rounded edges of a certain radius.
- 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.
- a fuel injection nozzle comprises a valve member slidable in a blind bore formed in a nozzle body, a seating defined adjacent the blind end of the bore, the valve member being shaped for co-operation with the seating at a seatline to prevent flow of fuel through an outlet orifice, the valve member when lifted from the seating allowing fuel flow through the outlet orifice from a fuel inlet, said outlet orifice extending from a space defined downstream of the seating line between the seating and the valve member, the orifice extending at an angle from the wall of the space and having an entrance with rounded edges of a certain radius, so that the fuel flow entrance conditions into the orifice from the space are not the same around the orifice, characterised in that the radius in the region of the most acute angle between the adjacent surface of the wall defining the space and the wall of the orifice should lie between 0.3 and 0.75 of the diameter of the orifice and in the region of least acute angle the radius should lie between 0.05 and 0.2 of the diameter of 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 along a seatline, with 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 or most acute angle 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 or least acute angle 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 orifice 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)
Description
- This invention relates to fuel injection nozzles for supplying fuel to compression ignition engines and comprising a valve member slidable within a blind bore formed in a nozzle body, a seating defined at the blind end of the bore, the valve member being shaped for cooperation with the seating at a seatline 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. In other designs the orifice extends from the seating at a position downstream of the seatline 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.
- FR-A-2335705 discloses a fuel injection nozzle having the features mentioned in the preamble of Claim 1 and in particular outlet orifices which extend from the "sac" volume, the entrance to the orifices from the "sac" volume having rounded edges of a certain radius.
- 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.
- According to the invention a fuel injection nozzle comprises a valve member slidable in a blind bore formed in a nozzle body, a seating defined adjacent the blind end of the bore, the valve member being shaped for co-operation with the seating at a seatline to prevent flow of fuel through an outlet orifice, the valve member when lifted from the seating allowing fuel flow through the outlet orifice from a fuel inlet, said outlet orifice extending from a space defined downstream of the seating line between the seating and the valve member, the orifice extending at an angle from the wall of the space and having an entrance with rounded edges of a certain radius, so that the fuel flow entrance conditions into the orifice from the space are not the same around the orifice, characterised in that the radius in the region of the most acute angle between the adjacent surface of the wall defining the space and the wall of the orifice should lie between 0.3 and 0.75 of the diameter of the orifice and in the region of least acute angle the radius should lie between 0.05 and 0.2 of the diameter of the orifice.
- In the accompanying drawings:-
- Figure 1 is a sectional side elevation of part of a known form of fuel injection nozzle;
- Figure 2 is a view to an enlarged scale of part of the nozzle seen in Figure 1; and
- Figure 3-5 show modifications to the shape of the outlet orifice and in some cases different types of nozzle.
- With reference to Figures 1 and 2 of the drawings there is shown the
tip 10 of a conventional inwardly opening fuel injection nozzle, the tip defining a "sac"volume 11 located downstream of a frustoconical seating 12 with which can cooperate along a seatline, with the end of avalve member 13. The valve member is slidable in a bore 9 formed in a nozzle body 8 and it defines anannular area 7 against which fuel under pressure can act to lift the valve member away from the seating against the action ofresilient means 6. When the valve member is lifted from the seating fuel under pressure can flow from anozzle inlet 5 into the "sac"volume 11 and then through one ormore orifices 14 extending through the wall of thetip 10. In the example 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.
- In order to increase the penetration of the fuel spray it is proposed to relax the "vena contracta" and this can be achieved by modifying the cross-section of the orifice at the entrance end thereof. As shown in Figure 3 the edge defined at the junction of the orifice and the surface of the wall which defines the "sac" volume is rounded off. The effect of this is to produce a less pronounced "vena contracta" and a more penetrative spray.
- The entrance conditions for the fuel flowing into the orifice are not the same all the way around the orifice and the greatest separation will occur where there is a combination of high fuel velocity and the most acute angle between the surface of the orifice and the surface of the wall which defines the "sac" volume.
- It is known from United States specification 4578164 to round off the edge or junction defined between the surface of the wall which defines the "sac" volume and the orifice and it is disclosed in the aforesaid specification that the rounding off influences the combustion of fuel in the engine and therefore the level of smoke in the engine exhaust. The aforesaid specification also discloses in one form of nozzle, the fact that different radii can be applied around the orifice to suit the entrance conditions. We have discovered that the actual radii applied around the entrance to the orifice are important so far as the formation of smoke is concerned and for an orifice which is inclined at 60° to the axis of the valve member as is shown in Figure 3, it is found that the radius RA in the region of greatest separation or most acute angle, 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 or least acute angle should be up to 0.75, preferably between 0.05 and 0.2 and ideally 0.1 of the diameter of the orifice.
- As will be seen from Figure 3 the "vena contracta" 16 is less pronounced than in the case of the known injection nozzle seen in Figures 1 and 2. In the case of a nozzle having a
single orifice 14 it is to be expected that as the axis of the orifice approaches the axis of the nozzle the difference in radii will become smaller. However since most injection nozzles will have a number of orifices the difference in the entrance conditions will tend to remain. - Figure 4 illustrates a nozzle in which the
orifice 17 extends from theseating 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. In the example of Figure 4 it will be observed that the axis of the orifice 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. Again however 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 anobturator 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.
Claims (2)
- A fuel injection nozzle for supplying fuel to a compression ignition engine comprising a valve member (13) slidable in a blind bore (9) formed in a nozzle body (8), a seating (12) defined adjacent the blind end of the bore (9), the valve member (13) being shaped for co-operation with the seating at a seatline to prevent flow of fuel through an outlet orifice (14, 17), the valve member (13) when lifted from the seating (12) allowing fuel flow through the outlet orifice (14, 17) from a fuel inlet (5), said outlet orifice (14, 17) extending from a space (11) defined downstream of the seating line between the seating (12) and the valve member (13), the orifice (14, 17) extending at an angle from the wall of the space (11) and having an entrance with rounded edges of a certain radius, so that the fuel flow entrance conditions into the orifice (14, 17) from the space (11) are not the same around the orifice, characterised in that the radius (RA) in the region of the most acute angle between the adjacent surface of the wall defining the space (11) and the wall of the orifice (14, 17) should lie between 0.3 and 0.75 of the diameter of the orifice and in the region of least acute angle the radius (RB) should lie between 0.05 and 0.2 of the diameter of the orifice.
- A nozzle according to Claim 1, characterised in that the radius (RA) is 0.5 and the radius (RB) is 0.1 of the diameter of the orifice.
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 EP0370659A1 (en) | 1990-05-30 |
EP0370659B1 true EP0370659B1 (en) | 1992-12-30 |
Family
ID=10647154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890311599 Expired EP0370659B1 (en) | 1988-11-19 | 1989-11-09 | Fuel injection nozzle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0370659B1 (en) |
DE (1) | DE68904172T2 (en) |
ES (1) | ES2037962T3 (en) |
GB (1) | GB8827107D0 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19507188C1 (en) | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE19507171C1 (en) * | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
EP0809017A1 (en) * | 1996-05-22 | 1997-11-26 | Steyr-Daimler-Puch Aktiengesellschaft | Two-stage fuel injection nozzel for internal combustion engine |
DE19729827A1 (en) | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Fuel injector |
DE19931761A1 (en) | 1999-07-08 | 2001-01-18 | Bosch Gmbh Robert | Blind hole injection nozzle for internal combustion engines with a rounded transition between blind hole and nozzle needle seat |
DE19931890A1 (en) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Edge rounding method for combustion engine fuel injection nozzle injection orifice channel |
JP4103291B2 (en) * | 2000-03-08 | 2008-06-18 | 株式会社デンソー | Fuel injection nozzle |
DE10105674A1 (en) * | 2001-02-08 | 2002-08-29 | Siemens Ag | Fuel injection nozzle for an internal combustion engine |
DE10118164B4 (en) * | 2001-04-11 | 2007-02-08 | Robert Bosch Gmbh | Fuel injector |
DE10124748A1 (en) * | 2001-05-21 | 2003-02-27 | Bosch Gmbh Robert | Fuel injector |
DE10156020A1 (en) * | 2001-11-15 | 2003-07-17 | Bosch Gmbh Robert | Fuel injector |
DE10330256A1 (en) † | 2003-07-04 | 2005-01-20 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engine, comprises bulges arranged such that the two connecting lines of points of largest distance to the center form an angle of less than 180 degrees with the mirror plane |
DE10361762A1 (en) * | 2003-12-29 | 2005-07-28 | Robert Bosch Gmbh | Fuel injector |
GB0712403D0 (en) * | 2007-06-26 | 2007-08-01 | Delphi Tech Inc | A Spray Hole Profile |
CN104929837B (en) * | 2015-05-24 | 2017-08-11 | 北京工业大学 | A kind of diesel oil injection nozzle of gas-liquid binary states mixing jetting |
CN105332840B (en) * | 2015-10-31 | 2018-08-21 | 北京工业大学 | A kind of diesel injector and its method for realizing premixed combustion |
Family Cites Families (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 |
DE2557772A1 (en) * | 1975-12-20 | 1977-06-23 | Kloeckner Humboldt Deutz Ag | FUEL INJECTION VALVE |
CH612733A5 (en) * | 1976-05-26 | 1979-08-15 | Sulzer Ag | Nozzle of a fuel injection valve of a piston internal combustion engine |
DE3502642A1 (en) * | 1985-01-26 | 1986-07-31 | Daimler-Benz Ag, 7000 Stuttgart | FUEL INJECTION VALVE FOR AN AIR-COMPRESSING INJECTION COMBUSTION ENGINE |
-
1988
- 1988-11-19 GB GB888827107A patent/GB8827107D0/en active Pending
-
1989
- 1989-11-09 ES ES89311599T patent/ES2037962T3/en not_active Expired - Lifetime
- 1989-11-09 EP EP19890311599 patent/EP0370659B1/en not_active Expired
- 1989-11-09 DE DE1989604172 patent/DE68904172T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2037962T3 (en) | 1993-07-01 |
DE68904172D1 (en) | 1993-02-11 |
DE68904172T2 (en) | 1993-07-15 |
EP0370659A1 (en) | 1990-05-30 |
GB8827107D0 (en) | 1988-12-21 |
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