EP1644636A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1644636A1 EP1644636A1 EP04730825A EP04730825A EP1644636A1 EP 1644636 A1 EP1644636 A1 EP 1644636A1 EP 04730825 A EP04730825 A EP 04730825A EP 04730825 A EP04730825 A EP 04730825A EP 1644636 A1 EP1644636 A1 EP 1644636A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- injection valve
- valve according
- bulge
- bulges
- 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
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
- F02M61/184—Discharge orifices having non circular sections
-
- 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
- F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
-
- 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
- the invention is based on a fuel injection valve as it corresponds to the preamble of claim 1.
- a fuel injection valve is known, for example, from JP 11-117833 and has a valve body in which a blind bore is formed.
- a valve seat is formed at the bottom of the blind bore, with which a valve needle arranged in the blind bore interacts.
- At the bottom of the blind bore at least one injection channel is also formed, which connects the interior formed by the blind bore to the combustion chamber of the internal combustion engine and which has an inlet opening and an outlet opening. Controlled by the valve needle, which interacts with the valve seat, fuel is injected from the blind bore into the combustion chamber of the internal combustion engine through this injection channel.
- the injection channel is usually essentially cylindrical, in particular the inlet opening can be modified. From JP 11-117833, however, other shapes are known in which the injection channel has a star shape, cross shape, club shape or rectangular shape.
- the cross-sectional shape of the injection channel affects the injection characteristic of the fuel injection valve and can - depending on the type of fuel injection valve - lead to an improvement in the combustion process. However, all the shapes shown there have in common that they influence the inflow conditions from the valve seat into the injection channel not considered sufficiently.
- the one in the Fuel flowing into the injection channel is forced into a flow profile, which is determined by the cross section of the injection channel, which does not correspond to the inflow profile of the fuel into the spray hole, so that pressure losses occur in the injection channel, which impair the spray formation of the fuel when it is injected into the combustion chamber can.
- the fuel injection valve according to the invention with the characterizing features of patent claim 1 has the advantage over the prior art that the inlet cross section of the injection channel is designed in such a way that the fuel can be introduced from the blind bore into the injection channel with little loss, which increases the convertible injection pressure and the atomization of the Fuel positively influenced during the injection process.
- the inlet openings viewed in cross section, have a circular basic shape with a radius, a first bulge being formed over a first angular area of the circumference of the circular basic shape, the angular area of which is less than 180 °.
- a second bulge is provided in the circular basic shape, which is mirror-symmetrical to the first bulge, the mirror plane passing through the center of the circular basic shape.
- both bulges are arranged so that the two connecting lines of the farthest points of the recesses with the center enclose an angle with the mirror plane of less than 180 °. Based on flow tests, it could be shown that such recesses optimally support the inflows of the fuel and lead to a maximization of the speed and thus an improvement in the injection conditions.
- Advantageous refinements of the subject matter of the invention are possible through the subclaims.
- the bulges decrease continuously from the inlet opening to the outlet opening, so that the outlet opening corresponds at least approximately to a circular shape.
- the passage cross section of the injection channel is reduced in its longitudinal extent, which leads to an acceleration of the fuel in the injection channel.
- the bore reduces its circular cross section from the inlet opening to the outlet opening, that is to say it has a conical shape, which results in a further acceleration of the fuel flow.
- the orientation of the mirror plane between the two bulges is advantageously oriented in a common plane with the longitudinal axis of the blind bore, so that a fuel flows symmetrically into the injection channel with respect to the mirror plane.
- FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention
- FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole
- FIG. 3 shows an enlarged view of the inner wall of the blind hole with an injection channel
- Figure 4 shows the inlet opening of the injection channel
- Figure 5A to
- FIG. 5E each show cross sections through the injection channel at equidistant intervals, as shown in FIG. 2.
- a fuel injection valve according to the invention is shown in longitudinal section in FIG.
- a blind bore 3 is formed in a valve body 1, which has a longitudinal axis 8 and at the bottom of which a substantially conical valve seat 11 is formed.
- a blind bore 9 adjoins the valve seat 11, from which a plurality of injection channels 7 extend.
- the injection channels 7 open into the combustion chamber of the internal combustion engine in the installed position of the fuel injection valve.
- a piston-shaped valve needle 5 is arranged to be longitudinally displaceable, which is guided in a guided section 15 in the blind bore 3. Starting from the guided section 15, the valve needle 5 tapers to form a pressure shoulder 13 and merges at its end on the valve seat side into an essentially conical valve sealing surface 17 which cooperates with the valve seat 11.
- the blind bore 3 is expanded radially and thus forms a pressure chamber 19 which continues as an annular channel between the valve needle 5 and the blind bore 3 up to the valve seat 11.
- an inlet channel 25 runs in the valve body 1, via which the pressure chamber 19 can be filled with fuel.
- the valve needle 5 is acted upon by a device (not shown) with a closing force in the direction of the valve seat 11, so that a longitudinal movement of the valve needle 5 in the blind bore 3 can be achieved via the interaction of the hydraulic forces on the pressure shoulder 13 and the closing force. Lies the valve needle 5 on the valve seat 11, the pressure chamber 19 is sealed. However, if the valve needle 5 lifts off the valve seat, fuel flows from the pressure chamber 19 into the blind hole 9 and is injected from there through the injection channels 7 into the combustion chamber.
- FIG. 2 shows an enlargement of FIG. 1 in the area of the blind hole, this area being identified by II in FIG. 1.
- the injection channels 7, which start from the blind hole, have an essentially cylindrical shape.
- the inlet opening 20 of the injection channels 7 is arranged in the blind hole 9 and the outlet opening 22, from which the fuel emerges and is injected into the combustion chamber, on the outer wall of the valve body 1.
- FIG. 3 shows an enlarged representation of the inner wall of the blind hole 9 with an injection channel 7.
- the inlet opening 20 of the injection channel 7 is not circular, but has a shape that is optimized for the inlet of the fuel.
- the shape of the cross section - starting from the inlet opening 20 - increasingly approaches the circle over the length of the injection channel 7, so that the outlet opening 22 is circular. In this way, the overall cross section of the injection channel is reduced over the length, which accelerates the flow of fuel in the injection channel 7.
- FIG. 4 again shows the inlet opening 20 of an injection channel 7 in an enlarged representation.
- opening 20 has a circular basic shape 27 which has a center 28 and a radius R.
- a first bulge 30 is formed over a first angular range a-_ of the circular basic shape 27, which in the illustration shown here has approximately a parabolic shape.
- the bulge 30 has a point of greatest distance 130, the distance from the center 28 in FIG. 4 being designated A.
- the angular range a ⁇ _ is smaller than 180 °
- the connecting line 35 which connects the point greatest distance 130 with the center 28, includes an angle b with a mirror plane 33, which is smaller than 180 °.
- the mirror plane 33 runs through the center 28 and is preferably arranged in the same plane as the longitudinal axis 8 of the blind bore 3.
- the circular basic shape 27 has, over a second angular range a2, a second bulge 39 which is mirror-symmetrical to the first bulge 30 with respect to the mirror plane 33.
- the second bulge 31 also has a point at greatest distance 131, the line connecting it with the center point 28 and the mirror plane 33 also includes the angle b.
- the bulges 30, 31 run as channel-like recesses on the wall of the injection channel 7 symmetrically on both sides.
- the depth of the bulges 30, 31 can change or also remain constant over the entire length of the injection channel 7.
- FIGS. 5A to 5E show cross sections through an exemplary embodiment of an injection channel 7, the cross sections in their position being at levels A, B, C, D and E. correspond to Figure 2.
- FIG. 5A which shows the shape of the injection channel 7 in the sectional plane A, that is to say the inlet opening 20, the bulges 30, 31 are still clearly pronounced.
- FIG. 5B and FIG. 5C these bulges 30, 31 have already been significantly reduced, and in the sectional plane D and E, which are shown in FIGS. 5D and 5E, the bulges 30, 31 have disappeared.
- This results in an injection channel 7 which has an inlet opening 20 with the clearly formed bulges 30, 31 and which in its course merges into a circular shape up to the outlet opening 22.
- the inlet opening 20 of the injection channel 7 is oriented such that the bulges 30, 31 point in the direction of the open end of the blind bore 3.
- the inlet opening 20 is arranged rotated by 180 ° around the center 28, so that the bulges 30, 31 form channel-like recesses on the side of the injection channel 7 which is directed away from the valve needle 5.
- this orientation of the bulges 30, 31 can also lead to inflow conditions in the injection channel 7, which are advantageous and lead to improved spray formation and thus combustion to lead.
- Basic shape continuously reduced from the inlet opening 20 to the outlet opening 22, so that, for example, a conically tapering basic shape results, on the walls of which the bulges 30, 31 are provided.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003130256 DE10330256A1 (de) | 2003-07-04 | 2003-07-04 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
PCT/DE2004/000932 WO2005010350A1 (de) | 2003-07-04 | 2004-05-03 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1644636A1 true EP1644636A1 (de) | 2006-04-12 |
EP1644636B1 EP1644636B1 (de) | 2007-04-11 |
EP1644636B2 EP1644636B2 (de) | 2016-08-03 |
Family
ID=33521349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04730825.9A Expired - Lifetime EP1644636B2 (de) | 2003-07-04 | 2004-05-03 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1644636B2 (de) |
DE (2) | DE10330256A1 (de) |
WO (1) | WO2005010350A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008051365B4 (de) | 2008-10-15 | 2010-07-01 | L'orange Gmbh | Kraftstoff-Einspritzventil für Brennkraftmaschinen |
DE102011007885A1 (de) * | 2011-04-21 | 2012-10-25 | Continental Automotive Gmbh | Düsenbaugruppe für ein Einspritzventil und Einspritzventil |
EP2808533B1 (de) * | 2013-05-29 | 2019-08-14 | Delphi Technologies IP Limited | Kraftstoffeinspritzdüse |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8827107D0 (en) † | 1988-11-19 | 1988-12-21 | Lucas Ind Plc | Fuel injection nozzle |
JPH0326096A (ja) * | 1989-06-22 | 1991-02-04 | Fujitsu Ltd | 被監視制御装置のcpuリセット方式 |
DE19507171C1 (de) † | 1995-03-02 | 1996-08-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JPH109095A (ja) * | 1996-06-21 | 1998-01-13 | Zexel Corp | 燃料噴射ノズル |
DE19729827A1 (de) † | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
DE19815918A1 (de) * | 1998-04-09 | 1999-10-21 | Man B & W Diesel As | Brennstoffeinspritzvorrichtung |
DE19914719C2 (de) * | 1999-03-31 | 2001-05-03 | Siemens Ag | Vorrichtung zum hydroerosiven Runden von Einlaufkanten der Spritzlochkanäle in einem Düsenkörper |
DE19931890A1 (de) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Düsenkörper für eine Kraftstoffeinspritzdüse mit optimierter Spritzlochkanalgeometrie |
DE10132449A1 (de) * | 2001-07-04 | 2003-01-23 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
-
2003
- 2003-07-04 DE DE2003130256 patent/DE10330256A1/de not_active Withdrawn
-
2004
- 2004-05-03 DE DE502004003489T patent/DE502004003489D1/de not_active Expired - Lifetime
- 2004-05-03 WO PCT/DE2004/000932 patent/WO2005010350A1/de active IP Right Grant
- 2004-05-03 EP EP04730825.9A patent/EP1644636B2/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2005010350A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1644636B2 (de) | 2016-08-03 |
DE10330256A1 (de) | 2005-01-20 |
DE502004003489D1 (de) | 2007-05-24 |
WO2005010350A1 (de) | 2005-02-03 |
EP1644636B1 (de) | 2007-04-11 |
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