EP0222997A1 - Electromagnetically actuated fuel injector - Google Patents

Electromagnetically actuated fuel injector Download PDF

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Publication number
EP0222997A1
EP0222997A1 EP86112189A EP86112189A EP0222997A1 EP 0222997 A1 EP0222997 A1 EP 0222997A1 EP 86112189 A EP86112189 A EP 86112189A EP 86112189 A EP86112189 A EP 86112189A EP 0222997 A1 EP0222997 A1 EP 0222997A1
Authority
EP
European Patent Office
Prior art keywords
core
fuel
solenoid
characterized
injector according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86112189A
Other languages
German (de)
French (fr)
Other versions
EP0222997B1 (en
Inventor
Waldemar Ing. Hans
Wilhelm Dipl.-Ing. Kind
Heinrich Dipl.-Phys. Knapp
Wolfgang Ing. Kramer
Rudolf Dr.-Ing. Sauer
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
Priority to DE19853535124 priority Critical patent/DE3535124A1/en
Priority to DE3535124 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0222997A1 publication Critical patent/EP0222997A1/en
Application granted granted Critical
Publication of EP0222997B1 publication Critical patent/EP0222997B1/en
Expired legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04Injectors with heating, cooling, or thermally-insulating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors 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
    • F02M51/0671Injectors 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
    • F02M51/0675Injectors 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
    • F02M51/0678Injectors 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection

Abstract

A magnetic injection valve, in particular for injecting fuel into the intake tract of internal combustion engines, is proposed which has particularly good internal cooling. In the valve there is a magnet coil (3) wound on a coil carrier (2) which, encased in a valve housing (1), engages around a ferromagnetic core (7). The core (7) acts on an armature (27) which is connected to a movable valve needle (31). A bushing (60) in the core (7) and a sleeve (74) located outside the core (7) are mounted in such a way that the fuel exits from an inlet tract (91) of a supply element (90) via the fuel line Serving sleeve (74) enters the interior (6) of the valve housing (1) receiving the solenoid (3), after almost complete flow around the solenoid (3) leaves this interior (6) via a bore (100) and between the socket (60 ) and core (7) flows back to the end of the bushing (60), in order then to reach the armature (27) or further to the valve seat (44) through the bushing (60). Flow channels (96, 97) are incorporated in the coil carrier (2) for better cooling of the magnetic coil (3).

Description

    State of the art
  • The invention is based on an electromagnetically actuated fuel injection valve according to the type of the main claim. A fuel injection valve is already known in which the fuel flowing to the valve seat first flows around the solenoid coil, on the one hand to cool it and on the other hand to carry vapor bubbles which may occur during such a flow through the fuel injection valve into a return flow line.
  • When the internal combustion engine is hot started, however, difficulties can arise in the mixture adaptation, since in the first seconds after the start, fuel permeated with fuel vapor bubbles also reaches the valve seat. Due to its pronounced unwillingness to ignite, this fuel can severely impair the operational readiness of an internal combustion engine.
  • Advantages of the invention
  • In contrast, the magnetic injection valve according to the invention with the characterizing features of the main claim has the advantage of injecting a largely vapor-bubble-free, ignitable fuel into the intake manifold of an internal combustion engine even in the first decisive seconds after the hot start. This is achieved through a large, heat-absorbing surface of the fuel injected interior of the magnetic injector. By redirecting the fuel flow between the connection piece and the valve seat, the amount of thick juice stored in the valve at all times (meaning the gasoline without the volatile components) is increased, thus ensuring the availability of this important fuel for the first seconds after the hot start.
  • drawing
  • An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.
  • Description of the embodiment
  • In the magnetic injection valve shown in the drawing for the injection of fuel, preferably in the intake tract of a mixture-compressing internal combustion engine, 1 denotes a valve housing in the first approximation, in which a magnetic coil 3 is arranged on a coil carrier 2. To supply power, the magnet coil 3 has a contact lug 4, which leads out of the magnet coil 3 and the coil carrier 2.
  • The coil carrier 2 of the magnet coil 3 is seated in an interior 6 of the valve housing 1 on a core 7 which partially projects into the interior 6 of the valve housing 1 and closes the interior 6 with a flange 8. The flange 8 is seated on the one hand on a shoulder 9 of the valve housing 1 and on the other hand is partially surrounded by a flange 10 of the valve housing 1 and pressed against the paragraph 9 by this flange 10. The core 7 continues on the side of the flange 8 facing away from the magnet coil 3 in a connecting piece 11. Facing away from the flange 8 of the core 7, the interior 6 of the valve housing 1 is delimited by a magnetic flux guide shoulder 25 of the valve housing 1, which extends radially inwards and has a through hole 26 in alignment with the core 7. The coil carrier 2 is seated on the magnetic flux guide paragraph 25. Aligned to the core 7, a ring-shaped armature 27 projects into the through bore 26 of the magnetic flux guide section with little play. The armature 27 has a first blind bore 23 aligned with the core 7 and a second blind bore 24 facing away from the core 7 and coaxial with the first blind bore 23 and the valve axis. The first and second blind holes 23, 24 are connected to one another by a coaxial connecting hole 29 of smaller diameter than the diameter of the first and second blind holes 23, 24. The second blind bore 24 of the armature 27 receives the head 30 of a nozzle needle 31 in a non-positive or positive manner. The nozzle needle 31 extends away from the armature 27 into a guide bore 33 of a nozzle body 34, which is partially inserted into a holding bore 35 of the valve housing 1 and is pressed against a stop plate 37 by a flange 36 formed on the valve housing 1, which is pressed against one by the magnetic flux guide 25 educated Inner shoulder 38 of the valve housing 1 abuts. The nozzle needle 31 penetrates a through opening 41 in the stop plate 37 with a constriction section 40 and projects out of an injection opening 43 of the nozzle body 34 with a needle pin 42. Between the guide bore 33 of the nozzle body 34 and the injection opening 43, a conical valve seat surface 44 is formed, which cooperates with a conical sealing section 45 on the nozzle needle 31. A recess 46 is provided between the passage opening 41 and the circumference of the stop plate, the clear width of which is larger than the diameter of the constricted section 40 of the nozzle needle 31. The constriction section 40 is adjoined by a stop shoulder 48 of the nozzle needle 31, with which the nozzle needle rests on the stop plate 37 when the armature 27 is attracted when the solenoid coil is energized, the sealing section 45 having lifted off the valve seat 44 and fuel being sprayed off via the injection opening 43 can. A first guide section 49 of the nozzle needle 31 adjoins the stop shoulder 48, to which a cylinder section 50 and a second guide section 51 connect. The guide sections 49 and 51 give the nozzle needle 31 guidance in the guide bore 33 and are designed, for example, as a square to ensure a flow around the nozzle needle 31 up to the sealing section 45.
  • In the head 30 of the nozzle needle 31 there is a blind hole 55 which, aligned coaxially with the core 7, opens towards it. At the bottom of the blind hole 55, an obliquely mounted bypass bore 56 opens, which on the other hand opens to the fuel chamber between the head 30 and the stop shoulder 48 of the nozzle needle 31 and which causes a backflow of fuel for fuel return flow line and flushing out of unwanted vapor bubbles allowed. The diameter of the blind hole 55 is such that a compression spring 57 can be supported on the end face of the head 30 of the valve needle 31 formed between the blind hole 55 and the connecting bore 29 of the armature 27, which is supported on the other hand on an end face of a bushing 60 fastened in the connecting piece and which endeavors to act on the valve needle 31 in the direction of the valve seat surface 44 and thus to close the valve. The attachment of the socket 60 in the connector 11 is such. B. accomplished by a pronounced on the outer edge of the socket 60 tooth profile with longitudinal teeth. A seal between the socket 60 and the connecting piece 11 or core 7 is found only at the end of the socket 60 facing the armature 27, otherwise a flow in an annular gap 62 is possible over the entire length of the socket 60 between the latter and the connecting piece 11. In the armature 27 facing away from it, the socket 60 still ends within the connecting piece 11, which in turn is closed off at its end by a screen 61 designed as a cap.
  • The valve housing 1 in the area of the flange 10 and the connecting piece 11 over part of its length are surrounded by a plastic ring 65. This has, inter alia, a plug 66 which receives a plug connection 67 connected to the contact lug 4. In the armature 27 facing away from the plastic ring 65, also surrounding the connecting piece 11, an annular fuel guide body 70 follows. In its area facing the plastic ring 65, the Fuel guide body 70 against the outer jacket of the connecting piece 11, while in the opposite direction, starting from an annular collecting channel 71 incorporated in the fuel guide body 70, a cylindrical gap 72 remains between the fuel guide body 70 and the connecting piece 11. From the collecting duct 71, in the armature 27 facing direction, at least one first connecting duct 73 also leads to at least one sleeve 74, which runs axially parallel to the connecting piece and serves for the fuel supply. This sleeve 74 sits on the one hand in a first receiving bore 75 of the fuel guide body 70, which is connected to the first Connection channel 73 is connected or is identical to it, and on the other hand in a similar, second receiving bore 76 in the flange 8 of the core 7. The second receiving bore 76 is located in a second connecting channel 77, which preferably runs coaxially therewith, in this way a connection producing the magnetic coil 3 accommodating interior space 6. Advantageously, the sleeve 74 is also enclosed by the plastic ring 65. In the armature 27 facing away from it, the annular gap 72 of the fuel guide body 70 is closed off by a fuel filter 80. This fuel filter 80 is seated with a filter holder 81, partially encompassing a rim 82 of the fuel guide body 70, with this filter holder 81 on the outer jacket of the connecting piece 11. The flow through the fuel filter 80 is radial. In the outer jacket of the fuel guiding body 70, an annular groove 83 is machined, into which a first sealing ring 84 is inserted, which serves to seal the fuel guiding body 70 against a connecting flange 85 which partially surrounds it.
  • The supply of the solenoid injector with fuel and the return of excess fuel is ensured by a supply element 90. This supply element 90 can be designed, for example, as a metal profile with an inlet tract 91 and a return tract 92, the inlet tract 91 having an inlet opening 93 and the return tract having a return opening 94. The inlet opening 93 coaxially surrounds the return opening 94 in such a way that the inlet opening 93 is sealingly connected to the connecting flange 85, while the return opening 94 radially surrounds the connecting piece 11 at its end facing away from the armature 27. A second sealing ring 95 can be located between the return opening 94 and the connecting piece 11 for sealing.
  • The accommodated in the interior 6 of the valve housing 1, the magnet coil 3 accommodating coil carrier 2 has a smaller outer diameter than the diameter of the interior 6, so that the solenoid 3 or coil carrier 2 are washed on their outer jacket of fuel. The supply of fuel into the interior 6 of the valve housing 1 takes place in the manner already described above via the second connecting channel 77 in the flange 8. In that flat side of the coil carrier 2, which, facing the magnetic flux guide section 25, faces the nozzle body 34, is located radially running channels 96, which continue in the area of the inner bore of the coil carrier 2 as axial channels 97 over a certain length of the coil carrier 2. Openings 98 made radially in the coil carrier 2 connect these axial channels 97 to an annular space 99 formed between the coil carrier 2 and the outer jacket of the core 7. The individual radial ones Channels 96 and the axial channels 97 can each be connected to one another via transverse channels. The annular space 99 is in turn connected to the annular gap 62 between the connecting piece 11 and the socket 60 by at least one outlet opening 100.
  • The flow through the injection valve takes place after flowing through the fuel filter 80 via the annular gap 72 and through the sleeve 74 into the interior 6 and further via the radial channels 96 and the axial channels 97 via the openings 98 in the annular space 99 and via the outlet openings 100 in the between the connecting pieces 11 and bushing 60 are annular gap 62. Here, the fuel continues to flow in the direction away from the valve, is guided around the end face of bushing 60 and then flows through bushing 60 to armature 27.
  • Any vapor bubbles and more volatile components dissolved in the fuel are transported through the central bore of the bushing 60 to the return tract 92 of the supply member 90.
  • By deflecting the fuel twice on the way from the supply member 90 to the nozzle body 34 with specific flow around the solenoid 3, very good cooling of the valve is achieved with a large heat-transferring surface. Due to the large volume of the predominantly viscous fuel bound within the valve, there is a large supply of easily atomizable thick juice when the internal combustion engine starts hot. This supply provides a sufficient reserve for the first critical seconds during the hot start phase.

Claims (11)

1. solenoid injection valve, in particular for injecting fuel into the intake tract of a mixture-compressing internal combustion engine with a valve housing, a hollow, fuel-carrying core, which cooperates with an armature and is made of ferromagnetic material, and which is attached to a coil carrier, axially penetrated by at least part of the core, in a fuel-flowing interior of the valve housing, a magnetic coil located within the core, forming an annular gap between itself and the core, which sits sealingly in the core at its end facing the armature, and at least one opening connecting the annular gap to the interior at the armature-side end of the annular gap, characterized in that the interior (6) is connected via at least one channel, preferably formed by a sleeve (74), to an inlet tract (91) of a supply member (90) serving to supply fuel to the solenoid injector ung stands, and that the annular gap (62) and the interior of the sleeve (60) at the other, the armature (27) facing away from the common end open into a fuel return (92) leading away from the solenoid injector, the interior of the sleeve (60) as a fuel inflow serves to anchor (27).
2. Solenoid injector according to claim 1, characterized in that the connection between the opening (100) and Interior (6) takes place only with almost complete flow around the solenoid (3).
3. Solenoid injector according to claim 2, characterized in that channels are incorporated in order to flow around the solenoid (3) in the coil carrier (2).
4. Solenoid injector according to claim 3, characterized in that in that flat side of the coil carrier (2) which faces away from the supply member (90), radially extending channels (96) are incorporated.
5. Solenoid injector according to claim 4, characterized in that the radially extending channels (96) are interconnected by transverse channels.
6. Solenoid injector according to one of claims 3 to 5, characterized in that axially extending channels (97) are incorporated in the inside of the coil carrier (2) abutting the core (60).
7. Solenoid injector according to claim 6, characterized in that the axially extending channels (97) are interconnected by transverse channels.
8. Solenoid injector according to one of the preceding claims, characterized in that, viewed in the direction of the supply member (90), the socket (60) ends below the core (7).
9. Solenoid injector according to claim 8, characterized in that at the end of the core (7) facing away from the solenoid (3), a sieve (61) is attached.
10. Solenoid injector according to one of the preceding claims, characterized in that on the core (7) is designed as a cylindrical body fuel guide body (70) which eccentrically receives a part of the sleeve (74) in its end facing the solenoid (3) Receiving bore (75) and a collecting channel (71) connected to the receiving bore (75) and surrounding the core (7) in the form of a ring, from which a cylindrical gap (72) formed between the fuel guide body (70) and the core (7) ) opens in the direction away from the valve.
11. Solenoid injector according to claim 10, characterized in that, on the supply member (90) facing the end of the fuel guide body (70), a core (7) at the same time partially enclosing, radially flowed through fuel fuel filter (80).
EP86112189A 1985-10-02 1986-09-03 Electromagnetically actuated fuel injector Expired EP0222997B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19853535124 DE3535124A1 (en) 1985-10-02 1985-10-02 Electromagnetically actuable fuel injection valve
DE3535124 1985-10-02

Publications (2)

Publication Number Publication Date
EP0222997A1 true EP0222997A1 (en) 1987-05-27
EP0222997B1 EP0222997B1 (en) 1988-12-07

Family

ID=6282543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112189A Expired EP0222997B1 (en) 1985-10-02 1986-09-03 Electromagnetically actuated fuel injector

Country Status (4)

Country Link
US (1) US4700891A (en)
EP (1) EP0222997B1 (en)
JP (1) JPS6287662A (en)
DE (1) DE3535124A1 (en)

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US5494224A (en) * 1994-08-18 1996-02-27 Siemens Automotive L.P. Flow area armature for fuel injector
JP3546490B2 (en) * 1994-10-03 2004-07-28 株式会社デンソー Electromagnetic fuel injection valve
JPH08128373A (en) * 1994-11-04 1996-05-21 Toyota Motor Corp Fuel injection valve of internal combustion engine
WO1998051923A1 (en) 1997-05-13 1998-11-19 Bennett Technologies, L.L.C. Liquefied petroleum gas fuel system and method
US6227173B1 (en) 1999-06-07 2001-05-08 Bi-Phase Technologies, L.L.C. Fuel line arrangement for LPG system, and method
DE19936669A1 (en) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common rail injector
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US8528519B2 (en) 2010-10-27 2013-09-10 Mcalister Technologies, Llc Integrated fuel injector igniters suitable for large engine applications and associated methods of use and manufacture
US8387599B2 (en) 2008-01-07 2013-03-05 Mcalister Technologies, Llc Methods and systems for reducing the formation of oxides of nitrogen during combustion in engines
US8413634B2 (en) 2008-01-07 2013-04-09 Mcalister Technologies, Llc Integrated fuel injector igniters with conductive cable assemblies
US8561598B2 (en) * 2008-01-07 2013-10-22 Mcalister Technologies, Llc Method and system of thermochemical regeneration to provide oxygenated fuel, for example, with fuel-cooled fuel injectors
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US7628137B1 (en) 2008-01-07 2009-12-08 Mcalister Roy E Multifuel storage, metering and ignition system
US8074625B2 (en) 2008-01-07 2011-12-13 Mcalister Technologies, Llc Fuel injector actuator assemblies and associated methods of use and manufacture
US8365700B2 (en) 2008-01-07 2013-02-05 Mcalister Technologies, Llc Shaping a fuel charge in a combustion chamber with multiple drivers and/or ionization control
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US8201754B2 (en) * 2009-12-03 2012-06-19 Caterpillar Inc. Fluid injector with thermal load control
WO2011100701A2 (en) 2010-02-13 2011-08-18 Mcalister Roy E Fuel injector assemblies having acoustical force modifiers and associated methods of use and manufacture
EP2534347B1 (en) 2010-02-13 2016-05-04 McAlister, Roy Edward Methods and systems for adaptively cooling combustion chambers in engines
CN103003605B (en) * 2010-08-06 2014-07-30 川崎重工业株式会社 Gas pressure regulating valve
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GB2116255A (en) * 1982-03-05 1983-09-21 Bosch Gmbh Robert Electromagnetically actuable fuel injection valve

Also Published As

Publication number Publication date
US4700891A (en) 1987-10-20
DE3535124A1 (en) 1987-04-02
JPS6287662A (en) 1987-04-22
EP0222997B1 (en) 1988-12-07

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