EP1157203B1 - Injektor für eine einspritzanlage einer brennkraftmaschine - Google Patents
Injektor für eine einspritzanlage einer brennkraftmaschine Download PDFInfo
- Publication number
- EP1157203B1 EP1157203B1 EP00910542A EP00910542A EP1157203B1 EP 1157203 B1 EP1157203 B1 EP 1157203B1 EP 00910542 A EP00910542 A EP 00910542A EP 00910542 A EP00910542 A EP 00910542A EP 1157203 B1 EP1157203 B1 EP 1157203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- actuator
- housing
- valve piston
- control unit
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- 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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
-
- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/003—Valve inserts containing control chamber and valve piston
Definitions
- the invention relates to an injector for an injection system an internal combustion engine according to the preamble of the claim 1 (see EP-A-262 539).
- Conventional injectors for fuel injection in Internal combustion engines are generally modular and consist of several parts arranged coaxially one above the other, such as an injector body and a control module, the mechanical connection of two axially adjacent Parts through a connecting element like an adapter sleeve, a double clamping nut or a welding sleeve.
- the attachment of the injector in the cylinder head of the internal combustion engine is usually done by a so-called Clamping claw that fits the injector axially into a corresponding Press the mounting hole in the cylinder head, the Clamping claw rests on a cylindrical collar on the outside is integrally formed on the injector.
- cylindrical collar and the key surfaces are used in the known injectors either directly on the injector head or attached to a hollow cylindrical union nut, which the individual parts of the injector and on their top is connected to the injector head.
- the invention is therefore based on the object of an injector for an injection system of an internal combustion engine create in which the effort for manufacturing and assembly is reduced.
- the task is based on one of the above Injectors according to the preamble of claim 1, by the characterizing features of claim 1 solved.
- the invention includes the general technical teaching, to provide an essentially one-piece injector housing, that goes into the injector head at the top and at least the control unit picks up.
- the injector housing preferably takes but several modules of the injector open and clamped these axially against each other to provide a high pressure seal on the To create joints between neighboring modules.
- the common injector housing is advantageous reduces the number of high pressure sealing surfaces that could leak to the outside.
- the injector housing accommodates all components of the injector and connects with each other.
- the nozzle body at the bottom of the injector via a conventional clamping nut with the injector housing is screwed while the other components of the injector, such as the control unit, in the injector housing are accommodated.
- a separate Transmission lever for transmitting the actuating movement of the actuator dispenses with the valve piston by the actuator acts directly on the valve piston. This advantageously eliminates a component of the injector, whereby the manufacturing and Assembly effort is further reduced. Furthermore is achieved by dispensing with a conventional transmission lever the durability of the injector increases because of such Component problematic in terms of service life is.
- the contact surface between the actuator on the one hand and the Valve piston on the other hand is preferably so large that that due to the reduced surface pressure even with one Switching another liquid film between the actuator and the valve piston remains, which is a hydraulic Game compensation effects.
- the facing end faces actuator and / or valve piston are preferred convex shaped to tear off the liquid film the mechanical load during a switching operation avoid, however, the end faces can also completely be flat, what a simple length adjustment by measuring and grinding allowed.
- actuator and valve piston a spring arranged, which actuator and valve piston pushes apart in the axial direction and thus at rest the injector restores full play compensation.
- a spring advantageously allows also compensation for thermal expansion.
- valve piston of the Injector not directly in the injector housing, but stored in a separate valve housing that inside the injector housing is arranged.
- This has the advantage that the valve seat of the valve piston to be hardened is thus is in the valve housing and not in the injector housing, so that no expensive heat treatment of the entire injector housing is required.
- a continuous Leakage line dispensed by the central bore for the control elements in addition to the leakage return line from the nozzle up to the control unit.
- the leakage is then above the control unit continued via a separate leakage line, the Connection of the leakage line with the central bore preferably through a radial connecting bore.
- the injector according to the invention is preferably used in a common rail injection system used, however, the invention not limited to such an application, but basically can also be used with other types of injection systems.
- the injector shown in Figure 1 is modular and is used to inject fuel into a combustion chamber Internal combustion engine, being at the top of the injector as a component an injector head 1 is arranged, which on the Underside seamlessly into the common injector housing 2 passes so that the essential components of the injector mechanically fixed by the common injector housing 2 become.
- the injector head 1 enables the connection of a Injection line to the injector with a central injection system to connect that for all cylinders of the internal combustion engine provides the required injection pressure.
- the injector head 1 is chamfered on its upper side and provided with a screw connection 3 with an internal thread, which receives the end of the injection line.
- the injector head 1 has on its underside essentially cylindrical fuselage part on which below the bevel key surfaces 4 are molded together with a circumferential cylindrical collar 5 the engagement allow a clamping claw, which for simplification not is shown.
- the clamping claw presses axially on top of the circumferential collar 5, which makes the entire injector in a corresponding location hole in the cylinder head the internal combustion engine is pressed axially downwards, wherein between the lower face of the injector and the bottom surface a copper disc is arranged in the receiving bore, to seal the location hole.
- the Clamping claw laterally into the key surfaces 4 and prevents thus a twist of the injector when assembled around its longitudinal axis.
- the injector has a center on its top arranged cylindrical bore for receiving a Actuator 6, wherein in the lateral surface of the actuator 6 below two cylindrical circumferential grooves 7, 8 arranged one above the other are, the lower groove 8 in the assembled state receives an O-ring that the annular gap between seals the actuator 6 and the bore in the injector head 1.
- the upper groove 7, however, is in the assembled state a wire ring is arranged, the fastening via a banjo bolt of the actuator 6 in the injector head 1.
- the actuator 6 allows axial in a conventional manner Actuating movement to control fuel injection.
- the Actuator 6 acts here without the conventional injectors used mechanical links directly to one Valve piston 9.
- this offers the advantage that a component can be dispensed with, which means that the manufacturing and Assembly effort is reduced.
- the contact surface between the lower end face of the actuator 6 and the upper end face of the valve piston 9 essential in comparison to conventional injectors larger, which has the advantage that even when switching of the injector a film of liquid between the actuator 6 and the valve piston 9 remains, whereby a hydraulic Match compensation takes place.
- the lower face of the Actuator 6 is slightly convex, as shown in the figure 2 can be seen. This will tear off the liquid film due to those occurring during a switching operation mechanical loads on the contact surface between the Actuator 6 and the valve piston 9 prevented.
- the upper end face of the valve piston 9 accordingly be convex.
- a spring 10 is arranged, the actuator 6 and Valve piston 9 axially apart and thus at rest of the injector restores full axial play compensation.
- the spring 10 also allows compensation of thermal expansion of the individual components.
- a separate valve housing is used to guide the valve piston 9 11 inserted into the injector housing 2, which is the advantage offers that the valve seat to be hardened for the valve piston 9 in the valve housing 11 and not in the common Injector housing 2 is located, so that a complex heat treatment of the entire injector housing 2 for hardening the Valve seat can be dispensed with and only a hardening of the Valve housing 11 is required, which is much less is complex.
- a control unit is also located below the valve piston 9 12 arranged with a servo valve, the actuator 6 actuated the servo valve via the valve piston 9 and thus indirectly the position of a nozzle needle 21 in the guide bore 20 a nozzle 13 and thus controls the fuel flow, of the injector into the combustion chamber via a nozzle 13 Internal combustion engine is injected.
- the nozzle 13 is in the Drawing only shown schematically and can with the injector housing 2 connected via a conventional clamping nut are not shown in the drawing in order to maintain clarity.
- the injector shown has a special one advantageous form of leakage return on by instead one essentially over the entire length of the injector continuous additional leakage line an already existing central bore 14 in which a piston 22 axially is slidably arranged, which acts on the nozzle needle 21, is used for the leakage return line. hereby the manufacturing cost of the illustrated invention Injector further reduced.
- the injector shown also has an axially extending leakage line 15 on, but this only extends from above to below the control unit 12, where the leakage line 15 then into the central bore 14 opens.
- the connection of the leakage line 15 with the central bore 14 takes place here a radial bore 16 located at the mouth of the Leakage line 15 from the outer surface of the injector housing 2 extends inwards to the central bore 14, wherein the leakage line 15 is cut to the entry of leakage fluid from the central bore Allow 14 in the leakage line 15.
- a radially from the lateral surface of the injector housing 2 internal bore 16 does require sealing the outer mouth opening by a ball 17, however manufacturing technology much easier than other constructive Possibilities of the leakage line 15 in the central To let bore 14 open.
- control unit 12 When assembling the injector, the control unit 12 is also used the servo valve, the valve housing 11 and the valve piston 9 pushed into the injector housing 2. Then then the axial position of the valve piston 9 relative to the actuator 6 set by the length of the valve piston 9 for example is adjusted by measuring and grinding.
Abstract
Description
- Figur 1
- als bevorzugtes Ausführungsbeispiel der Erfindung den Kopfbereich eines Injektors in einer Querschnittsdarstellung sowie
- Figur 2
- eine Detailansicht der Kontaktstelle zwischen dem Aktuator und dem Ventilkolben des in Figur 1 dargestellten Injektors im Querschnitt.
Claims (9)
- Injektor für eine Einspritzanlage einer Brennkraftmaschine, mit einem Injektorkopf (1),
einer Düse (13) zum Einspritzen von Kraftstoff in den Brennraum der Brennkraftmaschine,
einer Steuereinheit (12) zur Steuerung der Kraftstoffweiterleitung von dem Injektorkopf (1) zu der Düse (13) sowie einem Aktuator (6) zur mechanischen Ansteuerung der Steuereinheit (12) zur Steuerung der Kraftstoffeinspritzung,
wobei an dem Injektorkopf (1) ein Injektorgehäuse (2) einstückig angeformt ist, das zumindest die Steuereinheit ( 12) aufnimmt und wobei der Aktuator (6) direkt auf einen Ventilkolben (9) wirkt,
dadurch gekennzeichnet, daß die Anlagefläche zwischen dem Aktuator (6) und dem Ventilkolben (9) so groß ist, daß bei einem Schaltvorgang ein Flüssigkeitsfilm zwischen den Kontaktflächen von Aktuator (6) und Ventilkolben (9) bestehen bleibt. - Injektor nach Anspruch 1,
dadurch gekennzeichnet, daß die einander zugewandten Stirnflächen des Aktuators (6) und/oder des Ventilkolbens (9) leicht konvex geformt sind, um einen Abriß des Flüssigkeitsfilms zu verhindern. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß zwischen dem Aktuator (6) und dem Ventilkolben (9) eine Feder (10) angeordnet ist. - Injektor nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet, daß der Ventilkolben (9) in einem separaten Ventilgehäuse (11) innerhalb des Injektorgehäuses (2) angeordnet ist, um eine ansonsten zur Härtung des Ventilsitzes erforderliche Wärmebehandlung des Injektorgehäuses (2) überflüssig zu machen. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß an der Mantelfläche des Injektorgehäuses (2) außen ein umlaufender Bund (5) angeformt ist, der als Auflage für eine Spannpratze dient, um den Injektor axial in einer Aufnahmebohrung in dem Zylinderkopf der Brennkraftmaschine zu verspannen. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß an der Mantelfläche des Injektorgehäuses (2) außen Schlüsselflächen (4) für den Eingriff einer Spannpratze angeformt sind, um im montierten Zustand eine Verdrehung des Injektors zu verhindern. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß eine im wesentlich axial verlaufende Leckageleitung (15) vorgesehen ist, die unterhalb der Steuereinheit (12) in eine zentrische Bohrung (14) mündet, die zur Aufnahme einer Steuerstange sowie zur Leckagerückleitung dient. - Injektor nach Anspruch 7,
dadurch gekennzeichnet, daß in dem Injektorgehäuse (2) eine im wesentlichen radial verlaufende Bohrung (16) angeordnet ist, die an der Mündungsstelle der Leckageleitung (14) von außen bis zu der zentrischen Bohrung (14) durchgeht, um die Leckageleitung (15) mit der zentrischen Bohrung (14) zu verbinden, wobei die äußere Mündungsöffnung der radialen Bohrung (16) im montierten Zustand verschlossen ist. - Injektor nach Anspruch 8,
dadurch gekennzeichnet, daß die äußere Mündungsöffnung der radialen Bohrung (16) im montierten Zustand durch eine Kugel (17) verschlossen ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19907544A DE19907544C2 (de) | 1999-02-22 | 1999-02-22 | Injektor für eine Einspritzanlage einer Brennkraftmaschine |
DE19907544 | 1999-02-22 | ||
PCT/DE2000/000469 WO2000050761A1 (de) | 1999-02-22 | 2000-02-18 | Injektor für eine einspritzanlage einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1157203A1 EP1157203A1 (de) | 2001-11-28 |
EP1157203B1 true EP1157203B1 (de) | 2002-10-23 |
Family
ID=7898419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00910542A Expired - Lifetime EP1157203B1 (de) | 1999-02-22 | 2000-02-18 | Injektor für eine einspritzanlage einer brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US6561435B2 (de) |
EP (1) | EP1157203B1 (de) |
DE (2) | DE19907544C2 (de) |
WO (1) | WO2000050761A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10038301A1 (de) * | 2000-08-05 | 2002-02-14 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE10111783B4 (de) * | 2001-03-12 | 2005-10-20 | Bosch Gmbh Robert | Einspritzdüse |
DE10131953A1 (de) | 2001-07-02 | 2003-01-23 | Siemens Ag | Steuermodul für einen Injektor eines Speichereinspritzsystems |
ITBO20020497A1 (it) * | 2002-07-30 | 2004-01-30 | Magneti Marelli Powertrain Spa | Iniettore di carburante per un motore a combustione interna con attuazione idraulica dello spillo |
DE10240442C1 (de) * | 2002-09-02 | 2003-12-24 | Siemens Ag | Kraftstoffinjektor mit einem Steuerventil |
DE10338081A1 (de) * | 2003-08-19 | 2005-03-10 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE102007042466B3 (de) * | 2007-09-06 | 2009-04-09 | Continental Automotive Gmbh | Einspritzsystem mit reduzierter Schaltleckage und Verfahren zum Herstellen eines Einspritzsystems |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445269A (en) * | 1939-03-01 | 1948-07-13 | Ex Cell O Corp | Combined injector nozzle and filter |
BE554051A (de) * | 1956-01-31 | |||
US4408718A (en) * | 1981-09-25 | 1983-10-11 | General Motors Corporation | Electromagnetic unit fuel injector |
DE3788406T2 (de) * | 1986-09-25 | 1994-04-14 | Ganser Hydromag Zuerich | Elektronisch gesteuertes Einspritzsystem. |
US5033442A (en) * | 1989-01-19 | 1991-07-23 | Cummins Engine Company, Inc. | Fuel injector with multiple variable timing |
US5127584A (en) * | 1991-05-06 | 1992-07-07 | General Motors Corporation | Fuel injection nozzle |
CH686845A5 (de) * | 1993-03-08 | 1996-07-15 | Ganser Hydromag | Steueranordnung fuer ein Einspritzventil fuer Verbrennungskraftmaschinen. |
DE9407079U1 (de) * | 1993-08-03 | 1994-12-08 | Bosch Gmbh Robert | Kraftstoffeinspritzdüse für eine Brennkraftmaschine |
DE4341546A1 (de) * | 1993-12-07 | 1995-06-08 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE4423657C2 (de) * | 1994-07-06 | 1997-10-02 | Daimler Benz Ag | Betätigungseinrichtung für ein Motorbremsventil einer Brennkraftmaschine |
GB9520243D0 (en) * | 1995-10-04 | 1995-12-06 | Lucas Ind Plc | Injector |
JP3687758B2 (ja) * | 1995-11-14 | 2005-08-24 | 株式会社デンソー | 燃料噴射装置 |
US5779149A (en) * | 1996-07-02 | 1998-07-14 | Siemens Automotive Corporation | Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke |
DE19634105A1 (de) * | 1996-08-23 | 1998-01-15 | Daimler Benz Ag | Einspritzventil für Verbrennungskraftmaschinen |
DE19650900A1 (de) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelektrischer Aktuator |
DE19802495A1 (de) * | 1997-06-19 | 1998-12-24 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19816316A1 (de) * | 1998-04-11 | 1999-10-14 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
-
1999
- 1999-02-22 DE DE19907544A patent/DE19907544C2/de not_active Expired - Fee Related
-
2000
- 2000-02-18 EP EP00910542A patent/EP1157203B1/de not_active Expired - Lifetime
- 2000-02-18 WO PCT/DE2000/000469 patent/WO2000050761A1/de active IP Right Grant
- 2000-02-18 DE DE50000680T patent/DE50000680D1/de not_active Expired - Lifetime
-
2001
- 2001-08-06 US US09/922,896 patent/US6561435B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US20010054652A1 (en) | 2001-12-27 |
US6561435B2 (en) | 2003-05-13 |
EP1157203A1 (de) | 2001-11-28 |
DE19907544A1 (de) | 2000-08-31 |
DE50000680D1 (de) | 2002-11-28 |
DE19907544C2 (de) | 2002-12-05 |
WO2000050761A1 (de) | 2000-08-31 |
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