EP0682179B1 - Brennstoffeinspritzventil - Google Patents

Brennstoffeinspritzventil Download PDF

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Publication number
EP0682179B1
EP0682179B1 EP95105421A EP95105421A EP0682179B1 EP 0682179 B1 EP0682179 B1 EP 0682179B1 EP 95105421 A EP95105421 A EP 95105421A EP 95105421 A EP95105421 A EP 95105421A EP 0682179 B1 EP0682179 B1 EP 0682179B1
Authority
EP
European Patent Office
Prior art keywords
insert
injection valve
fuel injection
main body
fuel
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
Application number
EP95105421A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0682179A1 (de
Inventor
Waldemar Dipl.-Ing. Hans
Christian Preussner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0682179A1 publication Critical patent/EP0682179A1/de
Application granted granted Critical
Publication of EP0682179B1 publication Critical patent/EP0682179B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim. It's already a Electromagnetically actuated valve for the injection of a Fuel-gas mixture in a mixture-compression-ignition Internal combustion engine known from US Pat. No. 4,957,241, where between a nozzle body and a protective cap a spacer plate to influence the air volume is installed is.
  • the spacer plate between the nozzle body and Protective cap has a central opening in which the immersed downstream pin end of a valve needle.
  • the Air supply to the exiting from a fuel channel Fuel is directed through air channels and air chambers.
  • the radial air supply is used to tap the valve needle determined and done by the height of spacer knobs around the entire fuel jet. Ultimately it will but by the size of that extending in the axial direction Annular gap between the pin of the valve needle and the amount of opening in the spacer plate and the composition of the fuel-air mixture.
  • Injection valves (US Pat. No. 4,982,716) are also known, where an adapter is provided at the downstream end is formed in the air supply channels. Downstream A single spray opening is a baffle in the adapter provided on which the hosed fuel jet hits and is directed in a film into two spray channels, being on the fuel films formed after the impact targeted air is directed from the air supply ducts.
  • the functions of air supply and metering and the Attachment to the injector released together, so that a Optimally both functions hardly possible due to the integration is.
  • the fuel injector according to the invention with the characteristic Features of the main claim has the advantage that very simple and inexpensive very good atomization of fuel achieved through a targeted gas supply becomes. This is due to an inexpensive attachment body possible, which can be easily mounted on the fuel injector and is removable. It also results from the Multi-part structural design of the front body a large variety of variants that influence the Gas throughput and the direction of the fuel very much allows quick and easy.
  • the insert is mainly for gas supply and metering responsible.
  • a beam splitter can advantageously be provided, which is a double jet of the fuel injector maintained or strengthened.
  • the insert part has at least one guide shoulder that is in an axial Engages slot of the base body.
  • a large variety of variants it is very easy to achieve that only the insert parts for various specific applications be replaced while the body is multiple is usable. So there is a modular system. A Disassembly of the front body from the fuel injector is easy at all times due to the easy to handle attachment possible.
  • a ring spring For attaching the attachment body to the fuel injector it is advantageous to use a ring spring that a radial tension on the base body of the attachment body exercises so that this also due to an additional locking connection on the fuel injector even with strong ones Vibrations cannot slip.
  • the ring spring must may not be completely circular, but can be more open Spring washer be formed.
  • FIG. 1 shows a partially shown Fuel injector
  • Figure 2 is a plan view on an insert part according to the invention
  • Figure 3 is a bottom view to an insert part according to the invention.
  • a valve is shown in FIG. 1 as an exemplary embodiment in the form of a fuel injector for fuel injection systems of mixture compressing spark-ignited Internal combustion engines partially shown. Together with one the fuel injector is used according to the invention for the injection of a fuel-gas mixture into an intake pipe or directly into the combustion chamber of the Internal combustion engine.
  • the one that can be actuated electromagnetically, for example Fuel injector 1 extends concentrically along a longitudinal valve axis 2.
  • the fuel injector 1 has one at the downstream end extending nozzle body 5.
  • a stepped longitudinal bore 7 is formed in the nozzle body 5, which runs concentrically to the valve longitudinal axis 2 and in the one z.
  • B. arranged needle-shaped valve closing part 10 is.
  • the valve closing part 10 has, for example, two Guide sections 11, 12, together with a guide area 13 of the wall of the longitudinal bore 7 of the nozzle body 5 serve to guide the valve closing part 10.
  • the Longitudinal bore 7 of the nozzle body 5 has at its downstream End up in the direction of fuel flow frustoconical tapered fixed valve seat 15 with one frustoconical in the direction of fuel flow tapered sealing section 17 of the valve closing part 10 together forms a seat valve.
  • Valve closing part 10 connected to a tubular armature 20, the one with the armature 20 partially in the axial direction surrounding magnetic coil 22 and an armature 20 in the fixed valve seat 15 opposite direction tubular core 23 of the fuel injector 1 cooperates.
  • Valve closing part 10 is a return spring 25 with its one end, which strives to close the valve closure member 10 in To move towards the fixed valve seat 15. With your the other end, the return spring 25 is supported on one e.g. B. non-magnetic adjusting sleeve 27.
  • a spray orifice plate 32 On an end face 30 of the nozzle body facing away from the core 23 5 of the fuel injection valve 1 is a spray orifice plate 32 which, for example, by means of Laser welding produced weld seam firmly with the nozzle body 5 is connected.
  • the spray plate 32 has, for example four spray orifices 33 through which the at lifted valve closing part 10 flowing past the valve seat 15 Fuel is sprayed.
  • armature 20 z. B. on the scope of a valve jacket also belonging to the valve housing 35 of the fuel injector 1 has a recess 37 formed in which an upper sealing ring 38 is arranged is the sealing of a stepped bobbin 39, which engages around the magnetic coil 22, with respect to the fuel serves.
  • a second sealing ring 40 provides one in the circumference of the nozzle body 5 introduced groove 42 for sealing between the nozzle body 5 and the valve jacket 35.
  • a Sealing element 44 on the circumference of the valve jacket 35 serves for sealing between the circumference of the injector and one Valve holder, not shown.
  • an attachment body 50 For supplying and metering a gas that the improved Processing and atomization of the fuel is at the downstream end an attachment body 50 made of plastic intended.
  • the Use of recirculated exhaust gas enables a reduction the pollutant emission of the internal combustion engine.
  • the feeder of the gas up to the attachment body 50 is not closer shown.
  • the attachment body 50 is formed in three parts, one at least partially tubular base body 51 the downstream End of the nozzle body 5 radially surrounds and for example is attached to this by snapping.
  • the basic body 51 also extends downstream in the axial direction the spray plate 32.
  • a in the base body 51st insert 52 can be used immediately when installed arranged downstream of the spray plate 32.
  • the insert 52 is designed so that a gas from outside of the front body 50 coming into the interior of the front body 50 between insert 52 and base body 51 can flow in.
  • a complete and secure fixation of the Attachment body 50 on the nozzle body 5 of the fuel injector 1 is ensured by an annular spring 55 which with its radial spring force, part of the base body 51 presses against the nozzle body 5.
  • the ring spring 55 can, for. B. a not completely closed spring washer.
  • the base body 51 of the front body 50 sits down again of an upstream support section 57 and a downstream beam splitting section 58 together.
  • Carrier section 57 is used to fasten the attachment body 50 on the nozzle body 5 since it is the downstream end of the nozzle body 5 radially surrounds, and the gas supply from outside of the front body 50 in the direction of the insert 52.
  • Im tubular support section 57 is on its outer contour a circumferential groove 60 is provided, for example most of the axial extent of the support section 57 is formed and receive the ring spring 55 can.
  • the carrier section 57 has outside the groove 60 a largely constant outer diameter, being at its upper end 61 chamfers 62 can be introduced to the To simplify assembly of the attachment body 50.
  • the beam splitting section 58 has three annular areas different outside diameter, which are concentric run to the valve longitudinal axis 2 and follow one another axially.
  • Two radially to the same extent over the support section 57 protruding ring areas 64 serve an annular groove 65 form in which a sealing ring 66 for sealing between the scope of the injection valve and one not shown Valve holder, for example the intake line of the Internal combustion engine, can be used.
  • the ring groove 65 is axially through the two ring regions 64 and radially through delimits a groove bottom 68 which has a smaller diameter than the outside diameter of the support portion 57, but is, for example, the same size as the diameter of the Inner wall of the tubular support section 57.
  • the entire base body 51 is on the fuel injector 1, especially on the nozzle body 5 by snapping one formed circumferentially in the carrier section 57, of the Inner wall extending radially in the direction of the longitudinal axis 2 of the valve and a low height bead 70 in a circumferential groove 72 attached to the nozzle body 5.
  • This Locking connection prevents the base body from slipping 51, especially with strong vibrations, not yet completely. In addition, there is no security against rotation by snapping into place guaranteed.
  • the annular spring arranged in the groove 60 of the carrier section 57 55 is therefore used.
  • the carrier section 57 In order to make the carrier section 57 sufficiently flexible, is in the carrier section 57 at least one axially over the entire Length of the carrier section 57, that is, from the upper end 61 to the upper of the two ring areas 64, extending Slot 74 provided.
  • This at least one slot 74 in Carrier section 57 enables the carrier section to be spread apart 57 when mounting on the nozzle body 5 and ensures thus for simplified handling. For example, are conceivable also two opposite in the carrier section 57 slots made 74.
  • the at least one slot 74 serves as an opening in the carrier section 57 the supply of gas towards the insert 52.
  • the base body 51 is in its beam splitting section 58 with two diagonally to the valve longitudinal axis 2, in bores 75 diverging downstream, over which the fuel-gas mixture is sprayed becomes.
  • the one remaining between the two holes 75 Material inevitably acts as a beam splitter 76. Since the Bores 75 starting from a lying in the insert 52 Hosing chamber 77 immediately downstream of the orifice plate 32 run, the beam splitter 76 has one Pointed cutting edge 78, which is directed toward the spray perforated disk 32 is, while starting from the cutting edge 78, the beam splitter 76 wider in cross-section in the downstream direction becomes.
  • the double spray already through the spray openings 33 of the spray plate 32 generated and for example for injecting fuel in the direction of two intake valves is needed, but through the intermediary Gas supply can be affected by the Beam splitter 76 and the two bores 75 thus obtained or is reinforced.
  • the insert 52 is received in a designated extending in the axial region of the upper ring region 64 and centrally arranged trough 80 of the base body 51.
  • a trough bottom 81 which is the trough 80 downstream limited, is formed, for example, where the spray chamber 77 ends inside the insert 52 Bores 75 begin and the cutting edge 78 lies. Furthermore it is possible to form the bores 75 so that the Cutting edge 78 of the beam splitter 76 protrudes into the spray chamber 77, is further upstream than the trough bottom 81, so that by one on one of the trough 80 of the base body 51 facing end face 83 arranged gas supply channel 84 inflowing gas reaches exactly in a bore 75.
  • the insert 52 is designed so that it with his outer contour, at least with that of the spray orifice plate 32 facing away from end 83, which is directly in the trough 80 is set, fits in the recess 80.
  • Next to the Trough bottom 81 has trough 80 radially outside the bores 75 differently beveled surfaces on, through which reaches a defined installation position of the insert 52 and ensures gas supply in two areas, for example becomes.
  • the insert part 52 are namely in its lower, from the Splash plate 32 facing away from the lower part Front 83 for example with two gas supply channels 84 e.g. trapezoidal cross-section introduced on the front, the open to the beam splitting section 58 of the base body 51 are, but in the installed state of the insert 52 of the tapered surfaces of the trough 80 are also limited.
  • the completely surrounded gas supply channels 84 thus represent Inflow spaces for the gas. That through the inflow spaces in gas entering the spray chamber 77 is affected by the configuration the gas supply channels 84 largely perpendicular to the fuel sprayed out of the spray openings 33.
  • the slope of the largely frustoconical Wall of the spray chamber 77 is, for example, identical with those of the divergent holes 75.
  • the at least one Guide lug 85 engages radially in the assembled state at least one axial slot 74 of the carrier section 57 on so that the installation position is precisely defined and slipping of the insert part 52 relative to the base body 51 can be excluded by the anti-rotation device.
  • the at least one guide extension 85 extends radially Direction beyond at least one annular region 86.
  • the annular area 86 exerts a spring action, because it is surrounded by a circulating and groove-shaped recess 89 axially to a small extent is mobile.
  • FIG. 2 shows a top view of the insert 52 It becomes clear how, for example, the two leadership approaches 85 which in the slots 74 of the support portion 57 engage radially over the one having an axial spring action Area 86 protrude. Depending on the width of the Slots 74 are also the guide lugs 85 with a corresponding Width trained.
  • the gas supply channels 84 are in the center of the guide lugs 85 arranged so that the gas below the Guide approaches 85 flows through the slots 74 and then gets directly into the gas supply channels 84.
  • the flow cross section for the gas in the inflow spaces tapers from outer circumference to the spray chamber 77 so that the gas is strong is accelerated and that emerging from the spray openings 33 and fuel 52 flowing axially through the insert, that the gas hits largely vertically, especially is atomized finely.
  • the gas supply channels can 84 perpendicular to the valve longitudinal axis 2 or inclined in the direction of flow of the fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP95105421A 1994-05-11 1995-04-11 Brennstoffeinspritzventil Expired - Lifetime EP0682179B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4416610A DE4416610A1 (de) 1994-05-11 1994-05-11 Brennstoffeinspritzventil
DE4416610 1994-05-11

Publications (2)

Publication Number Publication Date
EP0682179A1 EP0682179A1 (de) 1995-11-15
EP0682179B1 true EP0682179B1 (de) 1998-07-08

Family

ID=6517859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105421A Expired - Lifetime EP0682179B1 (de) 1994-05-11 1995-04-11 Brennstoffeinspritzventil

Country Status (5)

Country Link
US (1) US5655715A (es)
EP (1) EP0682179B1 (es)
JP (1) JPH0842429A (es)
DE (2) DE4416610A1 (es)
ES (1) ES2120096T3 (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772122A (en) * 1995-04-27 1998-06-30 Nippondenso Co., Ltd. Fuel injection apparatus for an internal combustion engine
US6371387B1 (en) 1997-03-13 2002-04-16 Siemens Automotive Corporation Air assist metering apparatus and method
DE19744739A1 (de) * 1997-10-10 1999-04-15 Bosch Gmbh Robert Brennstoffeinspritzventil
GB9914642D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
US6484700B1 (en) 2000-08-24 2002-11-26 Synerject, Llc Air assist fuel injectors
US6302337B1 (en) 2000-08-24 2001-10-16 Synerject, Llc Sealing arrangement for air assist fuel injectors
US6402057B1 (en) 2000-08-24 2002-06-11 Synerject, Llc Air assist fuel injectors and method of assembling air assist fuel injectors
US7104477B2 (en) 2001-09-13 2006-09-12 Synerject, Llc Air assist fuel injector guide assembly
WO2004106722A2 (de) * 2003-05-27 2004-12-09 Avl List Gmbh Brennkraftmaschine
EP1874480A2 (en) * 2005-02-04 2008-01-09 Murad M. Ismailov Fuel injection system and fuel injector with improved spray generation
US8820665B2 (en) 2007-09-25 2014-09-02 S.C. Johnson & Son, Inc. Fluid dispensing nozzle

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3046890A1 (de) * 1980-12-12 1982-07-15 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil, insbesondere kraftstoffeinspritzventil fuer kraftstoffeinspritzanlagen
US4982716A (en) * 1988-02-19 1991-01-08 Toyota Jidosha Kabushiki Kaisha Fuel injection valve with an air assist adapter for an internal combustion engine
FR2635827B1 (fr) * 1988-08-30 1993-11-26 Solex Dispositif d'injection de combustible a chambre d'aeration
DE4103918B4 (de) * 1990-02-15 2005-05-04 Aisan Kogyo K.K., Obu Mehrloch-Einspritzdüseneinrichtung
US5241938A (en) * 1990-03-14 1993-09-07 Aisan Kogyo Kabushiki Kaisha Injector with assist air passage for atomizing fuel
JP2996525B2 (ja) * 1991-03-20 2000-01-11 株式会社日立製作所 燃料噴射弁
DE4129834A1 (de) * 1991-09-07 1993-03-11 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
US5174505A (en) * 1991-11-01 1992-12-29 Siemens Automotive L.P. Air assist atomizer for fuel injector

Also Published As

Publication number Publication date
JPH0842429A (ja) 1996-02-13
EP0682179A1 (de) 1995-11-15
DE4416610A1 (de) 1995-11-16
ES2120096T3 (es) 1998-10-16
DE59502729D1 (de) 1998-08-13
US5655715A (en) 1997-08-12

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