EP0410158B1 - Dispositif d'injection simultanée de combustible et d'air pour les systèmes d'injection de combustible des moteurs à combustion interne - Google Patents

Dispositif d'injection simultanée de combustible et d'air pour les systèmes d'injection de combustible des moteurs à combustion interne Download PDF

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Publication number
EP0410158B1
EP0410158B1 EP90112429A EP90112429A EP0410158B1 EP 0410158 B1 EP0410158 B1 EP 0410158B1 EP 90112429 A EP90112429 A EP 90112429A EP 90112429 A EP90112429 A EP 90112429A EP 0410158 B1 EP0410158 B1 EP 0410158B1
Authority
EP
European Patent Office
Prior art keywords
inner tube
fuel
housing
valve
air
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
EP90112429A
Other languages
German (de)
English (en)
Other versions
EP0410158A1 (fr
Inventor
Ernst Dipl.-Ing. Linder
Hans Schlembach
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0410158A1 publication Critical patent/EP0410158A1/fr
Application granted granted Critical
Publication of EP0410158B1 publication Critical patent/EP0410158B1/fr
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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • F02M67/12—Injectors peculiar thereto, e.g. valve less type having valves
    • 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 relates to a device for the combined blowing out of fuel and air for fuel injection systems of internal combustion engines according to the preamble of independent patent claim 1.
  • Blow-out devices of this type are used for improved mixture preparation by means of improved atomization of the fuel at a high relative speed between fuel and air.
  • the atomized fuel is blown into the intake pipe leading to the cylinder of the internal combustion engine or directly into the cylinder, and is thus mixed well with the combustion air supplied to the cylinder.
  • the device according to the invention for the combined blowing out of fuel and air for fuel injection systems of internal combustion engines with the characterizing features of independent claim 1 has the advantage that an extremely small diameter of the housing connector can be achieved by training with the steel wire running in the interior of the inner tube and by the flexible steel wire manufacturing problems with misalignment and angular deviations can be avoided.
  • the valve seat cooperating with the valve member is formed on the end face of the inner tube with an annular seat surface extending transversely to the tube axis.
  • the valve member is designed as a valve plate, to which a throttle pin protruding into the inner tube is concentrically attached, which together with the inner wall of the inner tube delimits an annular throttle gap.
  • the stroke of the valve actuator is so large that even Changes in length, which are caused by thermal expansion, ensure that the throttling does not take place in the valve seat but at the throttle gap of the throttle pin.
  • the throttle pin is conical, with the end face having the smaller diameter facing away from the valve disk. Due to the conical design of the throttle pin, centering of the valve member is achieved as a result of the flow forces acting on it, as a result of which the friction is largely reduced. Overall, this creates a low-mass and friction-free valve member.
  • the device for the combined blowing out of fuel and air for a fuel injection system of internal combustion engines is shown in longitudinal section. It serves for metering fuel and for atomizing and blowing out the atomized fuel into the intake manifold of the internal combustion engine, directly at the inlet valve.
  • the device has a housing 10 with a fuel connection 11 and an air connection 12.
  • the Housing 10 is formed in several parts and has a central part 13, which carries the electrically insulating, for example made of plastic, air connection 12, an elongated hollow housing connector 14, which projects into the underside and has a very large length-diameter ratio, an in the middle part 13 of the housing insert 15 inserted from above, which receives an electromagnet 16, a rotationally symmetrical T-piece 31 resting on the housing insert 15 with its transverse part, which contains the fuel connection 11 coaxially, and one on the housing insert 15 while tightening the T-piece 31 screwed-on cover part 17.
  • a coaxial inner tube 19 is inserted into the housing connector 14, which has a blow-out opening 18 at the free end, which extends through the entire housing connector 14 and extends into the blow-out opening 18.
  • the inner tube 19 is clamped between the central part 13 and the housing insert 15 by means of a molded flange 20.
  • the inner tube 19 has an outer diameter which is smaller than the inside diameter of the housing connector 14, so that an annular space 21 is formed between the inner tube 19 and the housing connector 14, which is in communication with the air connection 12.
  • the interior of the inner tube 19 is connected via the interior of a sleeve 25 to the fuel connection 11, which lies coaxially to the inner tube 19 on the end face of the flange 20 and consists of magnetically conductive material.
  • the sleeve 25 carries a magnetically conductive intermediate ring 24 at one end and a magnetically non-conductive outer ring 26 with a T-shaped cross section at the other end.
  • a coil carrier 27 is seated on the sleeve 25 and is clamped between the intermediate ring 24 and the outer ring 26.
  • the coil carrier 27 receives an excitation coil 28 of the electromagnet 16.
  • the magnet armature of the electromagnet 16 which is designed here as an exposed ferromagnetic plate 29, is held on the end face of the sleeve 25 and the housing insert 15. This lies in a recess 30 between the housing insert 15 and Cover part 17 clamped spacer ring 31 and is lifted by a return spring 32 from the housing insert 15 and sleeve 25.
  • a working air gap 33 which is divided by the magnetically non-conductive outer ring 26 held between the housing insert 15 and the sleeve 25 into two air gaps, so that a double use of the on the plate 29 acting magnetic force is reached.
  • the excitation coil 28 is supplied with power via a contact screw, not shown, which is screwed into a threaded hole 42 in the central part 13 and projects through bores 22, 23 in the housing connector 15 or in the intermediate ring 24 as far as the connecting lug of the excitation coil 28.
  • a valve seat 34 with an annular seat surface oriented transversely to the tube axis is arranged on the end face of the inner tube 19 projecting into the blow-out opening 18.
  • a valve member 35 cooperates with the valve seat 34, which has a valve plate 36 to which a throttle pin 37 projecting into the inner tube 19 is concentrically attached.
  • the throttle pin 37 together with the inner wall of the inner tube 19, delimits an annular throttle gap 38 (FIG. 2).
  • the throttle pin 37 is conical, the end face of the throttle pin 37 having the smaller diameter facing away from the valve plate 36, and has a through hole 39.
  • the valve member 35 is actuated by the electromagnet 16, for which purpose the valve plate 16 is connected to the plate 29 via a steel wire 40 which passes through the through hole 39, the inner tube 19 and the sleeve 25.
  • Steel wire 40 and valve plate 36 or steel wire 40 and plate 29 can be connected, for example, by laser welding.
  • the electromagnet 16 When the electromagnet 16 is not energized, it acts on the magnet armature (plate 29) Restoring force of the valve plate 36 is pressed onto the valve seat 34.
  • the electromagnet 36 is energized, the magnet armature is moved against the return spring 32, so that the valve plate 36 can lift off the valve seat 34.
  • the stroke of the magnet armature and the stroke of the valve plate 36 thus defined is kept so large that even with changes in length of the steel wire 40, which are caused by thermal expansion, it is ensured that the fuel flow is not throttled in the valve seat 34 but at the throttle gap 38.
  • the conical design of the throttle pin 37 ensures that the throttle pin 37 with the valve plate 36 is centered by flow forces and thus the valve formed by the valve seat 34 and valve member 35 operates largely without friction.
  • a throttle gap 41 is likewise formed in the annular space 21 delimited by the inner tube 19 and the housing connector 14, which is in the flow direction of the air in the annular space 21 directly in front of the valve seat 34 (FIG. 2).
  • the electromagnet 16 If the excitation coil 28 of the electromagnet 16 is energized, the electromagnet 16 is energized and the plate 29 is tightened by the predetermined stroke against the force of the return spring 32. Due to the fuel pressure in the interior of the inner tube 19, the valve plate 36 opens around this stroke and fuel flows out across the flow direction of the air emerging from the annular space 21 via the throttle gap 41. There is a strong shear flow between the fuel and the air flowing out at high speed, which leads to very good atomization. The atomized fuel is blown out through the blow-out opening 18 and arrives together with that through the intake pipe sucked combustion air directly into the open intake valve of the internal combustion engine.

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)

Claims (5)

  1. Dispositif pour l'injection combinée de carburant et d'air pour des systèmes d'injection de carburant de moteurs à combustion interne, avec un carter (10), qui présente un raccord pour le carburant (11) et un raccord pour l'air (12) et un orifice d'injection pouvant être relié à ceux-ci, qui est formé à l'extrémité d'un ajutage de carter creux s'étendant longitudinalement (14), avec un organe de soupape (35) disposé à l'extrémité de l'ajutage de carter (14), qui est pressé par un ressort de fermeture de soupape (32) sur un siège de soupape (34) et peut être soulevé au moyen d'un électro-aimant (16), disposé dans le carter (10), vers l'extérieur à partir du siège de soupape (34), tandis que le siège de soupape (34) est disposé sur un tube interne (19) coaxial, passant à travers l'un des ajutages de carter (14), tube avec un diamètre plus petit par rapport au diamètre libre de l'ajutage de carter (14), ajutage qui s'étend jusque dans l'ouverture d'injection (18) et qu'un espace intérieur du tube interne (19) est en liaison avec le raccord de carburant (11), et qu'un espace annulaire (21) enfermé par le tube interne (19) et l'ajutage de carter (14) est en liaison avec le raccord d'air, dispositif caractérisé en ce que l'électro-aimant (16) présente une armature constituée comme un petit disque (29) en saillie, sur lequel vient en prise le ressort de fermeture de la soupape (32) qui prend appui, du côté du carter, et en ce que le petit disque (29) et l'organe de soupape (35) sont reliés par un fil d'acier (40) s'étendant dans l'espace intérieur du tube interne (19).
  2. Dispositif selon la revendication 1, caractérisé en ce que le siège de soupape (34) est constitué sur une face frontale du tube interne (19) avec la face frontale de forme annulaire s'étendant transversalement à l'axe du tube.
  3. Dispositif selon la revendication 2, caractérisé en ce que l'organe de soupape (35) est constitué comme une tête de soupape (36) sur laquelle est fixé concentriquement, un téton d'étranglement (37) pénétrant dans le tube intérieur (19), téton qui délimite en même temps qu'une paroi intérieure du tube interne (19), une fente d'étranglement (38) de forme annulaire.
  4. Dispositif selon la revendication 3, caractérisé en ce que le téton d'étranglement (37) est conçu de façon conique, une face frontale présentant le plus petit diamètre étant tournée à l'opposé de la tête de soupape (36).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que dans l'espace annulaire (21) délimité par le tube interne (19) et l'ajutage de carter (14) est constituée une fente d'étranglement (41) de forme annulaire dans le sens du courant directement avant le siège de soupape (34).
EP90112429A 1989-07-27 1990-06-29 Dispositif d'injection simultanée de combustible et d'air pour les systèmes d'injection de combustible des moteurs à combustion interne Expired - Lifetime EP0410158B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3924851A DE3924851A1 (de) 1989-07-27 1989-07-27 Vorrichtung zum kombinierten ausblasen von kraftstoff und luft fuer kraftstoffeinspritzanlagen von brennkraftmaschinen
DE3924851 1989-07-27

Publications (2)

Publication Number Publication Date
EP0410158A1 EP0410158A1 (fr) 1991-01-30
EP0410158B1 true EP0410158B1 (fr) 1992-12-23

Family

ID=6385957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112429A Expired - Lifetime EP0410158B1 (fr) 1989-07-27 1990-06-29 Dispositif d'injection simultanée de combustible et d'air pour les systèmes d'injection de combustible des moteurs à combustion interne

Country Status (4)

Country Link
US (1) US5102053A (fr)
EP (1) EP0410158B1 (fr)
JP (1) JP3048607B2 (fr)
DE (2) DE3924851A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6170760B1 (en) * 1999-01-25 2001-01-09 Precision Valve & Automation, Inc. Compact spray valve
GB2564869B (en) * 2017-07-24 2019-11-13 Delphi Tech Ip Ltd Fuel injector with a closed metallic tube

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA507810A (fr) * 1954-11-30 F. Campbell John Diffuseur
US494591A (en) * 1893-04-04 Automatic injector-burner
US2046592A (en) * 1931-04-10 1936-07-07 Vilbiss Co Spray head
US2154875A (en) * 1937-05-24 1939-04-18 Timken Roller Bearing Co Fuel injector
DE1170710B (de) * 1961-03-07 1964-05-21 Inst Francais Du Petrol Einrichtung zur Brennstoffzufuehrung und Zuendung von Brennkraftmaschinen mit Fremdzuendung
AT288784B (de) * 1966-10-20 1971-03-25 Bosch Gmbh Robert Elektromagnetisch betätigtes Kraftstoff-Einspritzventil für Brennkraftmaschinen
FR2109241A5 (fr) * 1970-10-08 1972-05-26 Lucas Industries Ltd
DE2508390A1 (de) * 1975-02-26 1976-09-09 Bosch Gmbh Robert Einspritz-magnetventil
DE2825998A1 (de) * 1978-06-14 1980-01-03 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3105687A1 (de) * 1981-02-17 1982-09-02 Robert Bosch Gmbh, 7000 Stuttgart "leckoellose kraftstoffeinspritzduese"
IN165341B (fr) * 1984-08-01 1989-09-23 Orbital Eng Pty
US4836453A (en) * 1988-02-22 1989-06-06 Outboard Marine Corporation Fuel injector with continuous air flow

Also Published As

Publication number Publication date
DE59000648D1 (de) 1993-02-04
DE3924851A1 (de) 1991-01-31
EP0410158A1 (fr) 1991-01-30
US5102053A (en) 1992-04-07
JPH03222865A (ja) 1991-10-01
JP3048607B2 (ja) 2000-06-05

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