EP1395745B1 - Kraftstoffinjektor mit düsennadeldämpfung - Google Patents
Kraftstoffinjektor mit düsennadeldämpfung Download PDFInfo
- Publication number
- EP1395745B1 EP1395745B1 EP02745091A EP02745091A EP1395745B1 EP 1395745 B1 EP1395745 B1 EP 1395745B1 EP 02745091 A EP02745091 A EP 02745091A EP 02745091 A EP02745091 A EP 02745091A EP 1395745 B1 EP1395745 B1 EP 1395745B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- injector
- nozzle
- control
- injector according
- 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
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
-
- 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
- F02M61/042—The valves being provided with fuel passages
Definitions
- injection systems which include a high-pressure common rail, over which the individual injectors for injecting fuel into the combustion chambers of Internal combustion engine to be fueled.
- Injection start and injection quantity be set with the electrically controllable fuel injector.
- the Injectors can be with the help of Spannpratzen in the cylinder head part of the internal combustion engine attach and can either with seat hole or blind hole injection nozzles be equipped. With the fuel injectors, the course of injection can be formed and on adjust the course of combustion in the combustion chamber.
- the accuracy of the injection duration and the amount of fuel injected into the combustion chamber is determined inter alia by the nozzle needle opening or closing speed.
- the fuel injectors still inject at relatively low pressures of about 250 bar, compared to the system pressure of about 1300 bar inject, on the other hand with the fuel injectors smallest pilot injection amounts from about 0.5 to 1.0 mm 3 / stroke at high pressures be represented by about 1600 bar.
- These requirements for the fuel injectors represent the conditions under which the nozzle needle opens and closes the injection opening on the combustion chamber. So far, the opening characteristic of the nozzle needle of the fuel injector and the nozzle needle speed is adjusted by a corresponding design of inlet and outlet throttles.
- a fuel injection valve is known. This will be particular used in diesel engines for the injection of fuel, especially diesel fuel, wherein the diesel fuel through a fuel inlet into the fuel injection valve arrives.
- This includes a counter in a guide bore of a valve body the force of a closing spring axially displaceable valve member, which at least during the opening stroke a spray hole in the valve body releases, through which the fuel into the combustion chamber can be injected.
- a fuel injection valve that the same advantages as a 2-spring holder supplies, which nevertheless simple and inexpensive can be made, is counteracting the damping stroke of the valve member Damping volume via a throttle with the fuel inlet in conjunction.
- An injector according to the preamble of claim 1 is EP 740068 A2 known.
- the solution proposed according to the invention enables nozzle needle damping, which is effective only when opening the nozzle needle on the nozzle seat and the substantially allows two opening speeds of the nozzle.
- the invention proposed Solution ensures that the nozzle initially with high opening speed within a Vorhubes opens, whereby the stroke, which within the Vorhubes is returned, is presettable.
- the inventively proposed damping of the nozzle needle allows an insensitive Design of the drain or inlet throttles from or to the control chamber of the nozzle needle in the housing of the fuel injector.
- the outlet throttle can be compared to known Design variants are designed much larger than before. determining Parameters for the pre-injection quantity are above all the variables pre-stroke and leakage gap.
- a larger-sized outlet throttle is an uncritical opening behavior at Small pressure level in the high-pressure collecting space (common rail) possible. this in turn leads to small copy controls in the mass production of high-pressure injection systems.
- FIG. 1 is the hydraulic circuit diagram of an inventively designed Injector for injecting fuel into the combustion chambers of an internal combustion engine refer to.
- a high-pressure line extends in the direction of an injection nozzle 2 of the injector for injecting fuel into the combustion chambers of an internal combustion engine. Branching from the extending between the high-pressure accumulator 1 and the injection nozzle 2 High-pressure line is an inlet throttle 3 is provided, via which a control room 4 is pressurized with high pressure fuel.
- the control room 4 on the one hand by a boundary wall 5 of the injector housing, not shown here limited; On the other hand, the high-pressure fuel is acted upon Control chamber 4 from a nozzle needle 6, i. whose front cone 7 limited. A pressure relief of the control chamber 4 via a schematically indicated control edge.
- control edge 8 with resulting leakage oil gap in the injector is subordinate.
- the control of the under high pressure fuel acted upon Control chamber 4 takes place for example via a solenoid valve 10, which a Closed position 10.1 and can accept an open position 10.2.
- a solenoid valve 10 which a Closed position 10.1 and can accept an open position 10.2.
- About the solenoid valve is, if this is switched to its open position 10.2, the standing with high pressure Fuel acted upon control room 4 connected to a leak oil outlet 11, so that the control volume can flow to the fuel reservoir of the Kratistoffeinspritzsystems.
- solenoid valve 10 can for pressure relief of the control room also a piezoelectric actuator or a magnetic-hydraulic whilr be used.
- FIG. 2 shows an injector consisting of several components for injecting Fuel in the combustion chambers of an internal combustion engine shown in longitudinal section.
- an injector body 20 extends an inlet bore 21, which in the region of Nozzle needle 6 of the injector in a surrounding the nozzle needle 6 in the region of a pressure stage Nozzle space 25 opens.
- the nozzle needle 6 extends to Nozzle needle tip 26, depending on the vertical stroke movement of the nozzle needle 6 in the injector 20 an injection port 27 in the region of an injection cone releases or closes.
- Via the injection opening 27 of the injection nozzle 2 passes through the opening or closing movement of the nozzle needle 6 corresponding to certain fuel volume combustion progress into the combustion chamber of an internal combustion engine.
- a nozzle needle pin 24 formed on the nozzle needle 6, which is surrounded by a spring element. Below the nozzle needle pin 24 of the nozzle needle 6 extends through a portion of the Injector housing a hole that receives the outlet throttle 9 and in the leak oil drain 11 opens.
- the area of the nozzle needle head is on an enlarged scale of the injector as shown in Figure 2 in more detail.
- FIG. Z reproducing the detail Z according to Figure 2 shows that the injector body 20 is constructed in several parts and in the direction of the nozzle space, not shown in Figure 2.1 25 is crossed by a high-pressure bore 21.
- the high pressure bore 21st is the pressure chamber 4 in the interior of the injector body 20 with the control chamber 4 in connection.
- a closing spring element 45 is accommodated, which For example, can be configured as a coil spring.
- the closing element 45 is supported on the one hand to a nozzle needle head 34 of the nozzle needle 6 and on the other hand to a in the Control chamber 4 recorded shim 23 from. That preferably as a spiral spring trained closing element 45 is penetrated by the nozzle needle pin 24 of the nozzle needle 6; the total stroke, the nozzle needle 6 with appropriate pressure relief of the control room 4 executes, is designated by reference numeral 29.
- the locking element 45 accommodated in the control chamber 4 of the injector body 20 is supported at the head portion 34 of the nozzle needle 6 from.
- the head portion 34 of the nozzle needle 6 in the embodiment as shown in Figure 2.1 is in a nozzle needle head diameter 36 formed, which exceeds the diameter of the nozzle needle 6.
- On the circumference of the Nozzle needle head 34 open spaces 35 are formed, which in the axial direction of the nozzle needle tip 26 extending are limited by a control edge 28.
- At the extent of the nozzle needle head 34 may be formed a plurality of free surfaces 35, so for Example three open spaces 35, offset by 120 ° to each other at the periphery of the nozzle needle head 34 are formed.
- the nozzle needle 6 is set so that the respective Control edges 28 of the free surfaces 35 above a housing-side control edge in the injector 20 stand. This position corresponds to the closed position of the nozzle needle 6, whose Nozzle needle tip 26 is placed in the nozzle seat, so that the nozzle needle still the entire Hubweg 29 can ascend.
- FIG. 2.2 gives an illustration of a detail according to FIG. 2.1 on an enlarged scale again.
- the nozzle needle 6 completes the nozzle needle and the nozzle needle head 34 received thereon has a lifting movement in the direction of the im Control chamber 4 provided shim 23 to, until the control edge 28, the housing side The edge formed in the injector housing 20 is covered.
- the leakage gap between the nozzle needle 6 and the Injector 20 is not in use and the nozzle needle 6 can open freely.
- the control edge 28 is on the housing side on the injector body 20 provided paragraph. Until reaching the Vorhubes 31 can therefore from Control chamber 4 along the free surfaces 35 on the nozzle needle head 34, the nozzle needle head diameter 36 is formed, unimpeded fuel along the control edge 28 in the here not shown outlet throttle 9 and thus reach the leak oil drain 11.
- the nozzle needle 6 has in the nozzle needle head diameter 36 trained nozzle needle head 34 in an upper stop emotional.
- the force acting on the front side of the nozzle needle head 34 force memory 45th is corresponding to the total stroke 29 - compare illustration according to Figure 2.1 - compressed.
- the free surface 35 on the nozzle needle head 34 limiting control edge 28 has the corresponding, formed on the injector body 20 control edge in a length a leakage gap 33 defining length covered.
- the speed of the nozzle needle 6 in the opening direction is now considerably through the existing in the control room 4 Brazed volume, whereby the nozzle needle 6 at a further Auffahrschul reduced Speed is imposed until it has reached the top stop.
- FIG. 3 shows a further embodiment variant of the nozzle needle damping provided on the injector side.
- the head region of the nozzle needle 6 as shown is formed in Figure 3 as a head portion 38 which in to the nozzle needle. 6 corresponding diameter 37 is formed.
- the integrated nozzle needle 38 of the Nozzle needle 6 as shown in Figure 3 forms a contact surface for a preferred designed as a spiral spring closing element 45, while the opposite end of the Closing element 45 on a recessed in the control chamber 4 of the injector body 20 shim 23 is present.
- the control chamber 4, in FIG which the closing element 45 is received by an inlet throttle 3 via the Zulaufbohrung 21 to apply pressure, which the injector body 20 substantially runs through parallel to the nozzle needle 6.
- the inflow surfaces 39 can, for example, to 180 ° offset at the periphery of the integrated head portion 38 of the nozzle needle 6 may be provided.
- the closing element 45 is preferably configured as a spiral spring - of the boundary wall of the control chamber 4 outside and one supported on the nozzle needle 6 nozzle needle pin 24 so that no kinking can occur.
- Figure 3.1 shows the formation of a leakage gap 33 during the Auffahrschul the Nozzle needle 6 in a pressure-relieved control chamber.
- the damping of the opening movement of the nozzle needle 6 to the effect that only when opening the nozzle needle damping is effective, so that two ⁇ fmungs technicallyen set according to the total stroke 29 of the nozzles, allows a less sensitive Design of inlet throttle 3 to the control chamber 4 and its outlet throttle 9.
- the outlet throttle 9 can be much larger according to the proposed invention be designed so far, as the representable with the inventively configured injector Pre-injection quantities mainly by the sizes 2 to 31 and the leakage gap 33 are set.
- a larger-sized outlet throttle 9 is a less critical Opening behavior at low pressures in the high-pressure accumulator 1 possible; In particular, this makes it possible to achieve a smaller copy spread in mass production.
- the stroke profile 41 of the nozzle needle 6 is denoted by reference numerals 41, during the entire duration of a drive cycle 'with reference numerals 42 is marked.
- the closing of the nozzle needle 6, be it with executed in enlarged diameter 36 Nozzle needle head 34 or formed with an integrated head 38 with inflow surfaces, so the closing movement is mainly due to the size of the inlet throttle 3 to the control room 4 determined within the injector body and substantially independent of the leakage gap 32 between the nozzle needle 6 and the injector body 20.
- the less sensitive Design of inlet throttle 3 to the control chamber 4 and this downstream outlet throttle 9 can completely decouple the closing behavior from this design characteristic be so that with respect to the opening of the nozzle needle 6 reaches minimum opening pressures and also at high pressures, the quantity steepness of the in the combustion chamber of a Internal combustion engine to be injected amount of fuel can be significantly reduced can and in particular advantageously realize small pilot injection quantities to let.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- Figur 1
- das hydraulische Schaltbild eines erfindungsgemäß gestalteten Injektors zum Einspritzen von Kraftstoff,
- Figur 2
- einen Injektor im Längsschnitt,
- Figur 2.1
- eine injektorseitige Düsennadellagerung,
- Figur 2.2
- eine Darstellung eines Details gemäß Figur 2.1 in vergrößertem Maßstab,
- Figur 2.3
- den sich einstellenden Leckagespalt am oberen Düsennadellager,
- Figur 3
- eine weitere Ausführungsvariante einer injektorseitigen Düsennadellagerung,
- Figur 3.1
- den sich einstellenden Leckagespalt und
- Figur 4
- den Verlauf der Düsennadelöffnungsgeschwindigkeit mit und ohne Dämpfung eines Ansteuerzyklus.
Claims (9)
- Injektor zum Einspritzen von Kraftstoff in die Brennräume einer Verbrennungskraftmaschine mit einem Injektorgehäuse (20) und einer Düsennadel (6) zum Öffnen und Verschließen von Einspritzöffnungen (27), wobei das von den Einspritzöffnungen (27) abgewandte Ende der Düsennadel (6) in einen Steuerraum (4) mündet, in dem ein Federelement (45) aufgenommen ist, der Steuerraum (4) über eine Zulaufdrossel (3) mit einer Hochdruckleitung (21) und über eine Ablaufdrossel (9) mit dem Leckölablauf (11) verbunden ist, und wobei die Düsennadel (6) von einem über die Hochdruckleitung (21) beaufschlagten Düsenraum (25) umgeben ist, welcher in einem Düsengehäuse ausgebildet ist, welches von einem Spannelement (22) umschlossen ist, dadurch gekennzeichnet, dass im Kopfbereich (34, 38) der Düsennadel (6) Steuerkanten (28) ausgebildet sind, die bei Hubbewegungen (29) der Düsennadel (6) in den Steuerraum (4) einen Leckagespalt (33) durch Überdeckung der Steuerkanten (28) mit einer gehäuseseitigen Steuerkante in axialer Richtung bilden.
- Injektor gemäß Anspruch 1, dadurch gekennzeichnet, daß die Düsennadel (6) auf der dem Steuerraum (4) zuweisenden Seite mit einem Düsennadelzapfen (24) versehen ist, der von einem Schließelement (45) umschlossen ist.
- Injektor gemäß Anspruch 1, dadurch gekennzeichnet, daß der Kopfbereich (34) der Düsennadel (6) in einem dem Durchmesser der Düsennadel (6) übersteigenden Durchmesser (36) ausgeführt ist.
- Injektor gemäß Anspruch 3, dadurch gekennzeichnet, daß am Umfang des Kopfbereiches (34) der Düsennadel (6) mindestens zwei Strömungsfreiflächen (35) ausgebildet sind, die von der Steuerkante (28) begrenzt sind.
- Injektor gemäß Anspruch 3, dadurch gekennzeichnet, daß am Kopfbereich (34) der Düsennadel (6) drei am Umfang um 120° versetzte Teilflächen (35) ausgebildet sind.
- Injektor gemäß Anspruch 1, dadurch gekennzeichnet, daß die Düsennadel (6) einen integrierten Kopfbereich (38) umfaßt, in welchen Zuströmungsfreiflächen (39) integriert sind.
- Injektor gemäß Anspruch 6, dadurch gekennzeichnet, daß an der Düsennadel (6) in Strömungsrichtung des Kraftstoffes gesehen den Zuströmfreiflächen (39) nachgeordnet Freiflächen (35) nachgeschaltet sind, die von Steuerkanten (28) begrenzt sind.
- Injektor gemäß Anspruch 7, dadurch gekennzeichnet, daß die Freiflächen (35) am Umfang der Düsennadel (6) um 120° zueinander versetzt ausgebildet sind.
- Injektor gemäß Anspruch 1, dadurch gekennzeichnet, daß sich der Leckagespalt (33) in einer vom Hubweg (29, 31) der Düsennadel (6) im Injektorgehäuse (20) abhängigen Länge einstellt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10126370 | 2001-05-30 | ||
DE10126370A DE10126370A1 (de) | 2001-05-30 | 2001-05-30 | Kraftstoffinjektor mit Düsennadeldämpfung |
PCT/DE2002/001931 WO2002097258A1 (de) | 2001-05-30 | 2002-05-25 | Kraftstoffinjektor mit düsennadeldämpfung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1395745A1 EP1395745A1 (de) | 2004-03-10 |
EP1395745B1 true EP1395745B1 (de) | 2005-02-16 |
Family
ID=7686663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02745091A Expired - Lifetime EP1395745B1 (de) | 2001-05-30 | 2002-05-25 | Kraftstoffinjektor mit düsennadeldämpfung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1395745B1 (de) |
JP (1) | JP2004519622A (de) |
BR (1) | BR0205438A (de) |
DE (2) | DE10126370A1 (de) |
WO (1) | WO2002097258A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060196974A1 (en) * | 2005-03-01 | 2006-09-07 | Caterpillar Inc. | Fuel injector having a gradually restricted drain passageway |
EP2295784B1 (de) * | 2009-08-26 | 2012-02-22 | Delphi Technologies Holding S.à.r.l. | Kraftstoffeinspritzdüse |
DE102013006419A1 (de) * | 2013-04-15 | 2014-10-16 | L'orange Gmbh | Kraftstoffiniektor |
Family Cites Families (6)
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. |
GB9508623D0 (en) * | 1995-04-28 | 1995-06-14 | Lucas Ind Plc | "Fuel injection nozzle" |
WO1997008452A1 (fr) * | 1995-08-29 | 1997-03-06 | Isuzu Motors Limited | Dispositif d'injection de carburant du type a accumulation |
JPH1182221A (ja) * | 1997-09-05 | 1999-03-26 | Denso Corp | 内燃機関用の燃料噴射装置 |
DE19917190A1 (de) * | 1999-04-16 | 2000-10-26 | Mtu Friedrichshafen Gmbh | Kraftstoffinjektor für eine Brennkraftmaschine |
DE19930832A1 (de) * | 1999-07-03 | 2001-01-11 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
-
2001
- 2001-05-30 DE DE10126370A patent/DE10126370A1/de not_active Ceased
-
2002
- 2002-05-25 WO PCT/DE2002/001931 patent/WO2002097258A1/de active IP Right Grant
- 2002-05-25 JP JP2003500405A patent/JP2004519622A/ja active Pending
- 2002-05-25 DE DE50202284T patent/DE50202284D1/de not_active Expired - Lifetime
- 2002-05-25 EP EP02745091A patent/EP1395745B1/de not_active Expired - Lifetime
- 2002-05-25 BR BR0205438-8A patent/BR0205438A/pt not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
JP2004519622A (ja) | 2004-07-02 |
WO2002097258A1 (de) | 2002-12-05 |
BR0205438A (pt) | 2003-07-01 |
EP1395745A1 (de) | 2004-03-10 |
DE10126370A1 (de) | 2002-12-19 |
DE50202284D1 (de) | 2005-03-24 |
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