EP1044328B1 - Pumpedüse vom typ mit offener einspritzdüse - Google Patents
Pumpedüse vom typ mit offener einspritzdüse Download PDFInfo
- Publication number
- EP1044328B1 EP1044328B1 EP98960860A EP98960860A EP1044328B1 EP 1044328 B1 EP1044328 B1 EP 1044328B1 EP 98960860 A EP98960860 A EP 98960860A EP 98960860 A EP98960860 A EP 98960860A EP 1044328 B1 EP1044328 B1 EP 1044328B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- plunger
- needle
- group
- injector
- 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
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
- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/021—Injectors structurally combined with fuel-injection pumps the injector being of valveless type, e.g. the pump piston co-operating with a conical seat of an injection nozzle at the end of the pumping stroke
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- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
- F02M57/024—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical with hydraulic link for varying the piston stroke
Definitions
- the invention relates to a pump nozzle of the type with an open injection nozzle, consisting of a nozzle body with an axial space that ends in a nozzle tip with spray bores, from one in the axial space guided injection piston serving as a closing element, which Injection piston in the axial space limits a pressure space, of which the Run out spray holes.
- an open injector type pump nozzle is off EP 460 693 A1. It has the special feature that the injection piston is both a pump element and a closing element. Even with these Pump nozzles exist when used in high-performance diesel engines - the are mostly charged - in order to minimize consumption and emissions the problem that the requirements for injection between Distinguish significantly between idling and full load.
- the injection quantity is small when the engine is idling and the compression pressure is low and the ignition delay is long. As little as possible during the ignition delay Fuel as slowly as possible, and yet well atomized, injected become. At full load and high speed, however, the injection quantity large - especially large for supercharged high-performance engines - and the injection duration should be as short as possible, since only for the injection a limited crank angle is available. Overall, that requires Combustion optimization with regard to consumption and emissions uniform distribution of the fuel in the combustion chamber and a defined Atomization.
- the invention is therefore based on the object, even with generic Pump nozzles the nozzle cross-section and the delivery rate the respective operating state to be able to adapt. It is under customizing both the Understand control during operation as well as the design.
- the two groups of spray holes are lockable separately, the first from the injection plunger, the second from the plunger needle, which at certain Load conditions also acts as an injection piston. With these will not only the nozzle cross-section, but also the pump characteristics changed. This is only possible because both closing elements are pumping elements are.
- the piston needle remains closed at idle and low load. This is in this operating state, the volume of the delivery chamber is initially small. Furthermore, the effective area of the injection piston is only that of an annulus and therefore smaller, which is particularly the case with hydrostatic pressure transmission a relatively higher one from the pump drive to the injection piston Injection pressure means. After all, the nozzle cross section is only the sum the cross sections of a row of spray holes. The spray holes can be relatively small to achieve a long injection period. Thereby the injection pressure becomes high, which means atomization of the fuel improved.
- the injection piston points at its An outer wall on an annular space, which when the injection piston is closed connects the fuel supply with a reflux (claim 4).
- the shape and design of the closure organs, as well as the grouping and arrangement of the spray holes can be very within the scope of the invention be different and adapted to the requirements of the pump function.
- a a particularly advantageous solution is that the nozzle tip inside has a conical seat and the second group of spray holes is arranged under the first group of spray holes, the Groups of spray holes each start at the same height (claim 8th).
- He > can be composed of one or more parts, in the present For example, it is divided along its radial surface 2 for manufacturing reasons. It merges into a nozzle tip 3 below and contains all of it Length of an axial space 4 accessible from above. This begins at the top with a bore 5, which is interrupted at a shoulder-like constriction 6 is and further down a first cylinder bore 8 and a smaller one forms second cylinder bore 9.
- a drive piston is tight and at the very top movably guided, it is for example by a not shown Camshaft driven.
- This is followed by an intermediate piston 11, which is common forms a spray adjustment chamber 12 with the drive piston, which via a connecting bore 13 to the injection adjustment control, not shown leads.
- a reflux is only indicated, the connects the axial space 4 with the return flow of the injection system.
- the intermediate piston 11 acts on an injection piston 15. It has the top a collar 16 on which a return spring 17 designed as a compression spring attacks from below, the lower end of which is supported on the constriction 6.
- the injection piston 15 is thus pressed upwards by the return spring 17, a stop bead 18 resting against the constriction 6 at rest.
- the injection piston 15 fits into the first cylinder bore 8, which extends from one shoulder 7 downwards, then fits further into the smaller one second cylinder bore 9 and ends with an end cone 20.
- the end cone 20 is at the end of the injection on a seat cone 21 of the nozzle tip on.
- a metering chamber 22 is formed and further down between the second cylinder bore 9, the end cone 20 and the seat cone 21 a pressure chamber 23.
- At 24 becomes fuel with the pressure of a feed pump, not shown, into the nozzle body 1 initiated and passes through a longitudinal bore 25 and a feed opening 26 into the dosing chamber 22. From this it flows during the injection through a narrow ring passage 27 into the pressure chamber 23 and from there Spray holes in the combustion chamber of the engine.
- an inwardly projecting anti-rotation pin 28 is provided with a vertical guide groove 29 cooperates on the injection piston 15.
- a piston needle 31 is guided in the longitudinal direction. It consists of an upper one Piston part 32 and a lower needle part 33 a pressure plate 34 on which a compression spring 35 acts downwards. their the upper end is supported on a plug 36 which is in the injection piston 15 is pressed or screwed.
- the plug 36 has an axial Pressure equalization bore 37 and forms a stop 38, if that Pressure plate 34 - as to be described - is raised.
- a control chamber 50 is formed between the piston part 32 and the Axial bore 30, a control chamber 50 is formed.
- the lower end of the nozzle tip is shown enlarged in FIG. She points an upper row of spray bores 60 and a lower row of spray bores 61 arranged at a certain distance from each other are.
- the spray bores can be within the scope of the invention Arrangement, length, cross section and inlet are designed very differently.
- the transition to the cone 63 takes place at an edge 64, which with the piston needle closed slightly higher than the inlet of the top row spray holes lies.
- the parts of the seat cone 21 in which the spray holes open are withdrawn, approximately at 65.
- FIG. 8 are drilled hole 70.71 drilled from a common Extend seat 72.
- FIG. 1 shows the pump nozzle after the metering stroke has been completed, at the end of the Upward movement of the injection piston 15 for idling or low load.
- the control chamber 50 is depressurized, which is why Piston needle 31 not participating in the upward movement of the injection piston, it was by the compression spring 35 despite the injection piston going up 15 kept closed.
- the injection piston 15 is now moved down to the position shown in Figure 2, so the fuel from the pressure shoulder 19 from the dosing chamber 22 through the ring passage 27 into the pressure chamber 23 and from there only from the end cone 20 of the injection piston through the spray bores 60 of the upper row into the combustion chamber injected into the engine. If the control chamber 50 continues remains depressurized, the injection piston is left alone, leaving the Piston needle 31 in the closed position, moved up again, back in the position of FIG. 1.
- a ratio in the range specified in claim 5 is advantageous -
- the cross-sectional areas of the spray bores 60, 61 of the two Rows can optimize the spray pattern and combustion process. at Low load is only injected through the spray holes 60 in the upper row, which is why their diameter can be smaller than that of the lower 61.
- the ratio of the cross-section can also be used for optimal coordination all spray holes (60) of the top row to all spray holes the bottom row (61) is larger than the ratio of the effective cross sections of the injection piston (15) and the piston needle.
Description
- Fig. 1:
- Die Pumpedüse in einer ersten Arbeitsstellung,
- Fig.2:
- Dieselbe, in einer zweiten Arbeitsstellung,
- Fig.3:
- Einen Querschnitt nach III-III in Fig.2,
- Fig.4:
- Dieselbe, in einer dritten Arbeitsstellung,
- Fig.5:
- Einen Querschnitt nach V-V in Fig.4,
- Fig.6:
- Einen Längsschnitt nach VI-VI in Fig.4,
- Fig.7:
- Detail A in Fig.1, vergrößert, und
- Fig.8:
- Eine Variante zu Detail A in Fig. 1, vergrößert.
Claims (10)
- Pumpedüse vom Typ mit offener Einspritzdüse, bestehend aus einem Düsenkörper (1) mit einem Achsialraum (4), der in einer Düsenkuppe (3) mit Spritzbohrungen endet, aus einem im Achsialraum geführten als Abschlußelement dienenden Einspritzkolben (15), welcher Einspritzkolben im Achsialraum einen Druckraum (23) begrenzt, von dem die Spritzbohrungen ausgehen, dadurch gekennzeichnet, daßa) die Düsenkuppe (3) eine erste (60) und eine zweite (61) Gruppe von Spritzbohrungen (60,61) aufweist, wovon die erste Gruppe (60) dem Einspritzkolben (15) zugeordnet und die zweite Gruppe (61) getrennt von der ersten abschließbar ist,b) der Einspritzkolben (15) eine Achsialbohrung (30) aufweist, in der eine Kolbennadel (31) geführt ist, deren Nadelteil mit einer im Inneren der Düsenkuppe (3) gebildeten Sitzfläche (21;62;72) zusammenwirkt, wobei der Kolbennadel (31) die zweite Gruppe von Spritzbohrungen (61) zugeordnet ist,c) die Kolbennadel (31) einen Kolbenteil (32) aufweist, auf den abwärts eine Druckfeder (35) wirkt und der in der Achsialbohrung (30) eine Steuerkammer (50) begrenzt,d) der Steuerkammer (50) ein Steuermedium zuführbar ist, das die Kolbennadel (31) gegen die Kraft der Druckfeder (35) bezüglich des Einspritzkolbens (15) anhebt, sodaß sie dessen Bewegung folgt.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß die Zufuhr des Steuermediums zur Steuerkammer (50) durch eine Zuführbohrung (41) im Düsenkörper (1) und eine Stichbohrung (43) im Einspritzkolben (15) erfolgt, wobei eine Längsnut (42) im Düsenkörper (1) oder im Einspritzkolben (15) vorgesehen ist.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß der Einspritzkolben (15) einen die oberste Stellung der Kolbennadel (31) fixierenden Anschlag (38) aufweist.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß der Einspritzkolben (15) an seiner Aussenwand einen Ringraum aufweist, der bei geschlossenem Einspritzkolben die Brennstoffzufuhr (24) mit einem Rückfluß (14) verbindet.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Durchmesser von Einspritzkolben (15) und Nadelteil (33) der Kolbennadel (31) 1:2 bis 1:3,5 beträgt.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser der ersten Gruppe von Spritzbohrungen (60) kleiner als der der zweiten Gruppe von Spritzbohrungen (61) ist.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis des Querschnittes aller Spritzbohrungen (60) der ersten Gruppe zu dem aller Spritzbohrungen der zweiten Gruppe (61) größer als das Verhältnis der wirksamen Querschnitte von Einspritzkolben (15) und Kolbennadel (31) ist.
- Pumpedüse nach Anspruch 1, dadurch gekennzeichnet, daß die Düsenkuppe (3) innen eine konische Sitzfläche (21) aufweist und die zweite (61) Gruppe von Spritzbohrungen (61) unter der ersten Gruppe (60) von Spritzbohrungen (60) angeordnet ist, wobei die Gruppen von Spritzbohrungen (60,61) jeweils auf gleicher Höhe beginnen.
- Pumpedüse nach Anspruch 8, dadurch gekennzeichnet, daß im Inneren der Düsenkuppe (3) eine Sitzfläche (21) für den Einspritzkolben (15) und eine Sitzfläche (62) für die Kolbennadel (31) ausgebildet ist, wobei die > erste Gruppe von Spritzbohrungen (60) unter der Sitzfläche (21) angeordnet sind.
- Pumpedüse nach Anspruch 8, dadurch gekennzeichnet, daß im Inneren der Düsenkuppe (3) eine Sitzfläche (21) für den Einspritzkolben (15) für die Kolbennadel (31) vorgesehen ist, von der mindestens eine der Gruppen von Spritzbohrungen (70,71) ausgeht.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19758066 | 1997-12-29 | ||
DE19758066A DE19758066A1 (de) | 1997-12-29 | 1997-12-29 | Pumpedüse vom Typ mit offener Einspritzdüse |
PCT/AT1998/000322 WO1999034114A1 (de) | 1997-12-29 | 1998-12-23 | Pumpedüse vom typ mit offener einspritzdüse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1044328A1 EP1044328A1 (de) | 2000-10-18 |
EP1044328B1 true EP1044328B1 (de) | 2002-09-18 |
Family
ID=7853495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98960860A Expired - Lifetime EP1044328B1 (de) | 1997-12-29 | 1998-12-23 | Pumpedüse vom typ mit offener einspritzdüse |
Country Status (4)
Country | Link |
---|---|
US (1) | US6257507B1 (de) |
EP (1) | EP1044328B1 (de) |
DE (2) | DE19758066A1 (de) |
WO (1) | WO1999034114A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1063416A3 (de) * | 1999-06-25 | 2003-08-06 | Delphi Technologies, Inc. | Kraftstoffeinspritzventil |
DE102005012929A1 (de) * | 2005-03-21 | 2006-09-28 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter Steuerung des Einspritzventilglieds und variabler Übersetzung |
EP3974050A1 (de) * | 2020-09-25 | 2022-03-30 | Basf Se | Düse mit selbstschliessendem mechanismus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH623114A5 (de) | 1977-09-01 | 1981-05-15 | Sulzer Ag | |
US5076240A (en) | 1990-06-07 | 1991-12-31 | Cummins Engine Company, Inc. | Articulated open nozzle high pressure unit fuel injector |
DE4023223A1 (de) | 1990-07-21 | 1992-01-23 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
DE4432686C2 (de) * | 1994-09-14 | 1996-09-05 | Man B & W Diesel Ag | Querschnittgesteuerte Einspritzdüse |
-
1997
- 1997-12-29 DE DE19758066A patent/DE19758066A1/de not_active Withdrawn
-
1998
- 1998-12-23 WO PCT/AT1998/000322 patent/WO1999034114A1/de active IP Right Grant
- 1998-12-23 US US09/582,807 patent/US6257507B1/en not_active Expired - Fee Related
- 1998-12-23 EP EP98960860A patent/EP1044328B1/de not_active Expired - Lifetime
- 1998-12-23 DE DE59805646T patent/DE59805646D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP1044328A1 (de) | 2000-10-18 |
DE59805646D1 (de) | 2002-10-24 |
DE19758066A1 (de) | 1999-07-01 |
US6257507B1 (en) | 2001-07-10 |
WO1999034114A1 (de) | 1999-07-08 |
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