EP1032761B1 - Brennstoffeinspritzventil mit integrierter zündkerze - Google Patents
Brennstoffeinspritzventil mit integrierter zündkerze Download PDFInfo
- Publication number
- EP1032761B1 EP1032761B1 EP99922069A EP99922069A EP1032761B1 EP 1032761 B1 EP1032761 B1 EP 1032761B1 EP 99922069 A EP99922069 A EP 99922069A EP 99922069 A EP99922069 A EP 99922069A EP 1032761 B1 EP1032761 B1 EP 1032761B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- spark plug
- fuel injection
- insulating
- injection valve
- 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
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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
- F02M61/166—Selection of particular materials
-
- 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
- F02M57/06—Fuel-injectors combined or associated with other devices the devices being sparking plugs
Definitions
- the invention relates to a fuel injector with an integrated spark plug according to the preamble of claim 1.
- DE-OS 196 38 025 a fuel injector with an integrated Spark plug for injecting fuel directly into the combustion chamber of a Internal combustion engine and for igniting the fuel injected into the combustion chamber known.
- this known fuel injection valve with an integrated spark plug acts an externally opening valve closing body with a valve body for training of a sealing seat together.
- the valve closing body is in one piece with a valve needle formed which extends inside the sleeve-shaped valve body.
- the valve needle is guided on the one hand by the valve closing body and on the other hand by a guide ring provided on the inlet side.
- the valve body is can be supplied with high voltage electrical power via a high voltage cable and has an ignition electrode at its spray end.
- valve body is radially surrounded by a ceramic insulation body, which in turn by one metallic housing body is surrounded, which has a further ignition electrode.
- the Valve needle and the valve closing body integrally formed with the valve needle is activated by an armature in cooperation with a magnetic coil Opening direction actuated.
- the anchor acts on an insulating one via a plunger Intermediate piece that bears against the guide ring of the valve needle.
- valve needle is not a high voltage insulating element having.
- the isolation is therefore carried out by the intermediate piece described, the only is non-positively, but not positively connected to the valve needle.
- This Construction is therefore only suitable for fuel injectors that open from the outside. There only an opening force via the intermediate piece, but not a closing force via the Valve needle can be transferred to the valve closing body, a Valve closing spring integrated in the valve body to generate the closing force become. This leads to a relatively complex design and thus at relatively high manufacturing and assembly costs.
- Another fuel injector with integrated spark plug is from the EP 0 661 446 A1 is known. With this fuel injector with integrated Spark plug is also not provided with an insulation element in the valve needle. Much more The high voltage is supplied via the valve needle, which is Insulating body extending in the feed direction is insulated radially on the outside. at this unfavorable design configuration is a total of four insulation bodies required, which leads to high manufacturing and assembly costs.
- the fuel injector according to the invention with an integrated spark plug the characterizing features of claim 1 has the advantage that In the valve needle, an insulating section that is insulating in the axial direction is integrated. which separates two metallic guide sections.
- the leadership of the Magnetic needle takes place through the metallic guide sections, the z. B. from hardened steel can be executed, and therefore can be precisely manufactured and their Surfaces have only a low coefficient of friction.
- a first one Guide section is arranged on the spray side and can with the Valve closing body can be formed in one piece.
- the second metallic guide section is with respect to the insulation portion disposed between the guide portions arranged on the inlet side and is guided in the insulation body.
- the Guide sections with the insulation section not only non-positively but also positively connected so that both in the opening direction and in In the closing direction, a power transmission via the valve needle is possible.
- the integration a return spring inside the valve body is therefore not necessary. It results themselves a structurally simple design, which with low manufacturing and Assembly effort can be produced.
- the insulation body can be used as a molded ceramic part low manufacturing costs can be produced. Since the isolation section only the Isolation, but not the leadership of the valve needle, are to the Manufacturing accuracy and the abrasion resistance of the insulation section are not particularly to make high demands.
- connection between the guide sections and the Isolation section is preferably carried out via connecting pins, which in corresponding Engage recesses.
- the connection can by friction flow, gluing or Partly done by shrinking.
- the insulation body preferably has a lateral recess through which a high-voltage cable is guided through to and with the valve body is electrically connected. It is advantageous to use a to shed electrically insulating potting compound, as this is a particularly good one Protection of the z. B. formed by welding or soldering joint of High-voltage cable with the valve body results. Can be particularly advantageous in the Potting compound an electrical erosion resistance or a high voltage resistant Insulation film for improved insulation of the solder joint or weld with be poured.
- Fig. 1 is a fuel injector with an integrated spark plug for direct Injecting fuel into a combustion chamber of a mixture-compressed, spark-ignition internal combustion engine and for igniting the in the combustion chamber injected fuel according to an embodiment of the invention shown.
- the fuel injector generally provided with the reference number 1 Integrated spark plug has a first housing body 2, which is by means of a thread 3 can be screwed into a receiving bore of a cylinder head, not shown, and a second housing body 4 and a third housing body 5. That through the housing body 3, 4, 5 formed metallic housing surrounds an insulation body 6, which in turn has a valve body 7 and at least partially a swirl insert 14 and one located inside the swirl insert 14 via the inlet end 8 of the Valve body 7 extending valve needle 9 at least partially radially on the outside surrounds.
- the valve needle 9 is a conical one on the injection side Valve closing body 10 connected together with an inside conical Surface on the spray-side end 11 of the valve body 7 forms a sealing seat.
- valve needle 9 and the valve closing body 10 formed in one piece.
- the valve closing body 10 When lifting the valve closing body 10 from the Valve seat surface of the valve body 7 gives the valve closing body 10 in the Valve body 7 formed outlet opening 12 so that a through the line 13th indicated, conical spray is sprayed.
- Swirl groove 14a For better comprehensive Distribution of the fuel is at least one in the illustrated embodiment Swirl groove 14a provided in the swirl insert 14.
- First ignition electrodes 15 are provided on the first housing body 2 the second ignition electrodes 16 provided for the valve body 7 for generating a Spark together.
- the Ignition electrodes 15, 16 are formed as partially parallel finger electrodes.
- a first ignition electrode 15 and a second one are alternately located Ignition electrode 16 in a predetermined electrode distance.
- the first Ignition electrodes 15 carry ground potential, while the second electrodes 16 also a high voltage potential can be applied.
- the lengths of the ignition electrodes 15 and 16 are the jet angle and the jet shape of the fuel jet 13 adapt.
- the ignition electrodes 15, 16 can either be in the fuel jet 13 immerse, or the fuel jet 13 can at a short distance to the Ignition electrodes 15, 16 are passed without the ignition electrodes 15, 16 of be wetted with the fuel. Immersion of the ignition electrodes is also conceivable 15, 16 in gaps from through the outlet opening 12 or more spray openings generated single beams.
- the valve body 7 is preferably made of two parts for receiving the swirl insert 14 a first partial body 7a and a second partial body 7b formed on a Weld 17 are welded together.
- the valve needle 9 is divided into a first metallic, spray-side guide section 9a, a second metallic, inlet-side Guide section 9b and a ceramic sleeve-shaped in the exemplary embodiment Isolation section 9c.
- the first guide section 9a is concentric with the Valve body 7 mounted swirl insert 14 out.
- a second guide of the valve needle 9 takes place in the insulation body 6 by means of the second guide section 9b the outer surface 19 of the second guide section 9b acts with a bore 20 in the insulation body 6 together.
- the guide sections 9a serving for guidance and 9b are designed as metallic components and can be used for the guidance required manufacturing accuracy can be produced. Because of the low The surface roughness of the metallic components is only slight Friction coefficient on the guides.
- the insulation section 9c can be as Spray ceramic part can be produced. Because the insulation section 9c is not the guide the valve needle 9 is used to the dimensional accuracy and surface roughness only to make low demands. A revision of the spray ceramic part is therefore not mandatory.
- the guide sections 9a and 9b with the insulation section 9c not only non-positively but also positively connected.
- the guide sections 9a and 9b each have a pin 21 or 22, each in a hole 23 formed as a recess of the Isolation section 9c is introduced.
- the connection between the Pins 21 and 22 of the guide portions 9a and 9b by friction, by Gluing or partially made by shrinking.
- shrinking it is advantageous if the reverse of that shown Embodiment of the guide portion 9b has a recess into which a pin of the insulation section 9c is insertable.
- the metallic guide section 9b can then be heated before shrinking, and the pin of the insulation section 9c can be inserted into the recess when the guide section is heated become.
- the guide section 9b cools, it contracts, so that there is a firm connection with the insulation portion 9c.
- the insulation section 9c is preferably sleeve-shaped.
- the second guide section 9b is connected to an anchor 24 which is connected to a Solenoid coil 25 for electromagnetic actuation of valve closing body 10 interacts.
- a connecting cable 26 is used to energize the magnetic coil 25
- the coil 25 is received by a coil carrier 27.
- a sleeve-shaped Core 28 at least partially penetrates solenoid 25 and is from armature 24 by a gap in the closed position of the Fuel injector spaced.
- the magnetic flux circuit is created by the ferromagnetic components 29 and 30 closed.
- the fuel flows over you Fuel inlet connector 31, which has a thread 32 with a not shown
- Fuel distributor is connectable in the fuel injector with integrated Spark plug 1.
- the fuel first flows through a fuel filter 33 and flows then in a longitudinal bore 34 of the core 28.
- adjusting sleeve 36 which in the longitudinal bore 34 of Core 28 is screwed.
- the adjusting sleeve 36 is used to adjust the bias a return spring 37 which acts on the armature 24 in the closing direction.
- a locking sleeve 38 serves to secure the setting of the adjustment sleeve 36.
- the fuel continues to flow through a longitudinal bore 39 in the second Guide section 9b of the valve needle 9 and enters an axial recess 40 in a cavity 41 of the insulating body 6.
- the fuel flows from there into one Longitudinal bore 42 of the valve body 7, in which the valve needle 9 extends, and finally reaches the previously described swirl groove 14a in the swirl insert 14.
- the first lead connected to the housing body 2 Ignition electrodes 15 ground potential, while the second, with the valve body 7 connected ignition electrodes 16 with a high voltage potential for generating Ignition sparks can be applied.
- A is used to supply the high voltage High-voltage cable 50, which has a side, pocket-like recess 51 in the Insulation body 6 is introduced.
- the stripped end 52 of the high voltage cable 50 is soldered at a soldering or welding point 53 to a contact clip 54 or welded.
- the contact clip 54 clasps the valve body 7 and provides one safe electrically conductive contact between the stripped end 52 of the High voltage cable 50 and the valve body 7 ago.
- the insulation body 6 has a radial bore 55, via which a soldering or welding tool leads to the soldering or welding point 53 can be.
- the pocket-like recess 51 with an electrically insulating potting compound 56 poured out.
- an integrated in the high-voltage cable 50 Burn-up resistor 57 can also be cast into the sealing compound 56.
- to improved insulation of the solder or weld 53 can be a high voltage resistant Inserted film 58 in the pocket-like recess 51 of the insulation body 6 and with the potting compound 56 can also be potted.
- potting compound 56 is such.
- the insulation body 6 and the valve body 7 can be connected to a thread 60 be screwed together. Furthermore, the insulation body 6 with the Housing body 2 to be screwed together on a further thread 61.
- the threads 60 and 61 are preferably secured with a suitable adhesive, which in the embodiment according to the invention is not, however, directly with the fuel in Contact is there.
- the insulating body 6 can also be inexpensive as a molded ceramic part getting produced.
- the valve body 7 and the insulation body 6 can with a Assembly mandrel screwed and glued to misalignment in the guide of the Compensate valve needle 9.
- the spatially close arrangement of the erosion resistor 57 to the ignition electrodes 15, 16 reduces the erosion at the ignition electrodes 15, 16 and allows despite one increased electrical capacity between the ignition electrodes 15, 16 a metallic Full coating of the fuel injector with integrated spark plug 1 through the metallic housing body 2, 4 and 5.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Description
Claims (9)
- Brennstoffeinspritzventil mit integrierter Zündkerze (1) zum direkten Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine und zum Zünden des in den Brennraum eingespritzten Brennstoffs mit
einem Ventilkörper (7), der zusammen mit einem mittels einer Ventilnadel (9) betätigbaren Ventilschließkörper (10) einen Dichtsitz bildet,
einem den Ventilkörper (7) und zumindest teilweise die Ventilnadel (9) radial umgebenden Isolationskörper (6), und
einem den Isolationskörper (6) zumindest teilweise radial umgebenden Gehäusekörper (2), wobei an dem Ventilkörper (7) und/oder dem Gehäusekörper (2) zumindest eine Zündelektrode (15, 16) vorgesehen ist,
dadurch gekennzeichnet, daß die Ventilnadel (9) einen in dem Ventilkörper (7) geführten ersten metallischen Führungsabschnitt (9a), einen in dem Isolationskörper (6) geführten zweiten metallischen Führungsabschnitt (9b) und einen zwischen den Führungsabschnitten (9a, 9b) angeordneten Isolationsabschnitt aufweist, wobei die Führungsabschnitte (9a, 9b) formschlüssig mit dem Isolationsabschnitt (9c) verbunden sind. - Brennstoffeinspritzventil mit integrierter Zündkerze nach Anspruch 1,
dadurch gekennzeichnet, daß der Isolationsabschnitt (9c) der Ventilnadel (9) durch einen keramischen Hülsenkörper gebildet ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der erste und der zweite metallische Führungsabschnitt (9a, 9b) jeweils einen Verbindungsstift (21, 22) aufweisen, der in eine Ausnehmung (23) des Isolationsabschnitts (9c) eingeführt ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der zweite metallische Führungsabschnitt (9b) jeweils eine Ausnehmung aufweist, in welchen ein Verbindungsstift des Isolationsabschnitts (9c) eingeführt ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet, daß die Verbindung zwischen den metallischen Führungsabschnitten (9a, 9b) und dem Isolationsabschnitt (9c) durch Reibschluß und/oder Verkleben und/oder Aufschrumpfen gebildet ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß der Isolationskörper (6) eine seitliche Aussparung (51) aufweist, durch welche hindurch ein Hochspannungskabel (50) zu dem Ventilkörper (7) geführt ist und mit diesem elektrisch leitend verbunden ist, wobei die Aussparung (51) mit einer elektrisch isolierenden Vergußmasse (56) vergossen ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach Anspruch 6,
dadurch gekennzeichnet, daß in dem Hochspannungskabel (50) ein elektrischer Abbrandwiderstand (57) integriert ist, der in die Vergußmasse (56) eingegossen ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach Anspruch 6 oder 7,
dadurch gekennzeichnet, daß das Hochspannungskabel (50) mit dem Ventilkörper (7) oder mit einer den Ventilkörper (7) umklammernden Kontaktklammer (54) durch Löten oder Verschweißen verbunden ist und die Lötstelle bzw. die Schweißstelle (53) durch eine hochspannungsfeste Isolationsfolie (58) abgedeckt ist, die in die Vergußmasse (56) eingegossen ist. - Brennstoffeinspritzventil mit integrierter Zündkerze nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß der Ventilkörper (7) aus zwei Ventilteilkörpern (7a, 7b) zusammengesetzt ist, die insbesondere durch Verschweißen miteinander verbunden sind.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19828848 | 1998-06-27 | ||
DE19828848A DE19828848A1 (de) | 1998-06-27 | 1998-06-27 | Brennstoffeinspritzventil mit integrierter Zündkerze |
PCT/DE1999/000861 WO2000000737A1 (de) | 1998-06-27 | 1999-03-24 | Brennstoffeinspritzventil mit integrierter zündkerze |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1032761A1 EP1032761A1 (de) | 2000-09-06 |
EP1032761B1 true EP1032761B1 (de) | 2004-09-29 |
Family
ID=7872310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99922069A Expired - Lifetime EP1032761B1 (de) | 1998-06-27 | 1999-03-24 | Brennstoffeinspritzventil mit integrierter zündkerze |
Country Status (6)
Country | Link |
---|---|
US (1) | US6340015B1 (de) |
EP (1) | EP1032761B1 (de) |
JP (1) | JP2002519570A (de) |
KR (1) | KR20010022255A (de) |
DE (2) | DE19828848A1 (de) |
WO (1) | WO2000000737A1 (de) |
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US3081758A (en) * | 1960-05-02 | 1963-03-19 | Walker Mfg Co | Pressure actuated fuel injector |
DE1526326C3 (de) * | 1964-02-10 | 1974-06-06 | Hermann 7742 St. Georgen Papst | Einspritz- und Zündvorrichtung für Brennkraftmaschinen |
US3795214A (en) * | 1973-03-23 | 1974-03-05 | T Sweeney | Apparatus for providing a sailboat with an auxiliary stern mast and sail |
US3926169A (en) * | 1974-06-21 | 1975-12-16 | Fuel Injection Dev Corp | Combined fuel vapor injector and igniter system for internal combustion engines |
US4736718A (en) * | 1987-03-19 | 1988-04-12 | Linder Henry C | Combustion control system for internal combustion engines |
DE3731211A1 (de) * | 1987-09-17 | 1989-03-30 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
JP3158620B2 (ja) * | 1992-02-26 | 2001-04-23 | いすゞ自動車株式会社 | 燃料噴射ノズル |
JPH05240126A (ja) | 1992-02-26 | 1993-09-17 | Isuzu Motors Ltd | 燃料噴射ノズル |
GB9210115D0 (en) * | 1992-05-11 | 1992-06-24 | United Fuels Ltd | Improvements in or relating to internal combustion engines |
US5409165A (en) * | 1993-03-19 | 1995-04-25 | Cummins Engine Company, Inc. | Wear resistant fuel injector plunger assembly |
JPH0719142A (ja) * | 1993-06-30 | 1995-01-20 | Ngk Spark Plug Co Ltd | 燃料噴射弁付き点火プラグ |
DE69410582T2 (de) | 1993-11-29 | 1998-11-26 | Toyota Motor Co Ltd | Kraftstoffeinspritzeinrichtung mit integrierter Zündkerze für Motor mit direkter Einspritzung |
US5607106A (en) | 1994-08-10 | 1997-03-04 | Cummins Engine Company | Low inertia, wear-resistant valve for engine fuel injection systems |
US5715788A (en) * | 1996-07-29 | 1998-02-10 | Cummins Engine Company, Inc. | Integrated fuel injector and ignitor assembly |
DE19638025A1 (de) * | 1996-09-18 | 1998-03-19 | Bosch Gmbh Robert | Brennstoffeinspritzventil mit integrierter Zündkerze |
-
1998
- 1998-06-27 DE DE19828848A patent/DE19828848A1/de not_active Withdrawn
-
1999
- 1999-03-24 DE DE59910651T patent/DE59910651D1/de not_active Expired - Fee Related
- 1999-03-24 JP JP2000557073A patent/JP2002519570A/ja not_active Withdrawn
- 1999-03-24 US US09/486,528 patent/US6340015B1/en not_active Expired - Fee Related
- 1999-03-24 WO PCT/DE1999/000861 patent/WO2000000737A1/de not_active Application Discontinuation
- 1999-03-24 KR KR1020007000828A patent/KR20010022255A/ko not_active Application Discontinuation
- 1999-03-24 EP EP99922069A patent/EP1032761B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19828848A1 (de) | 1999-12-30 |
EP1032761A1 (de) | 2000-09-06 |
DE59910651D1 (de) | 2004-11-04 |
WO2000000737A1 (de) | 2000-01-06 |
US6340015B1 (en) | 2002-01-22 |
KR20010022255A (ko) | 2001-03-15 |
JP2002519570A (ja) | 2002-07-02 |
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