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EP0944769A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP0944769A1
EP0944769A1 EP98947358A EP98947358A EP0944769A1 EP 0944769 A1 EP0944769 A1 EP 0944769A1 EP 98947358 A EP98947358 A EP 98947358A EP 98947358 A EP98947358 A EP 98947358A EP 0944769 A1 EP0944769 A1 EP 0944769A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
inner pole
injection valve
jacket
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
EP98947358A
Other languages
German (de)
English (en)
Other versions
EP0944769B1 (fr
Inventor
Ferdinand Reiter
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 EP0944769A1 publication Critical patent/EP0944769A1/fr
Application granted granted Critical
Publication of EP0944769B1 publication Critical patent/EP0944769B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • 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
    • F02M51/0667—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 acting as a valve or having a short valve body attached thereto
    • 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
    • F02M51/0682—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 body being hollow and its interior communicating with the fuel flow

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a metallic base body of the valve is formed in one part or two parts without a non-magnetic intermediate part.
  • the base body comprises the sections inlet connector, magnetic inner pole (core) and valve seat support.
  • the base body takes over the guidance of an armature, by means of which a valve closing body interacting with a valve seat can be actuated.
  • the base body has a magnetic throttle point, which has a significantly smaller wall thickness than the wall thicknesses of the upstream core and the downstream valve seat support.
  • an electromagnetically actuated fuel injector in which an inner core and an outer magnet housing are provided.
  • the magnet housing is designed so that a step between the core and the magnet housing Coil space for receiving a magnetic coil is formed.
  • the coil space is closed on the one hand above the magnet coil with a cover element and on the other hand below the magnet coil with a non-magnetic intermediate part.
  • two additional components are required in addition to the core and the magnet housing.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage of a particularly simple and inexpensive to manufacture, but by no means
  • the inner pole and the valve jacket are shaped such that the valve jacket at least partially radially surrounds the inner pole, so that an intermediate space is formed between the two, in which the solenoid coil is inserted.
  • the magnet coil is embedded safely and reliably, since it is completely surrounded by the valve jacket in the circumferential direction and the space is delimited axially above and below the magnet coil by metallic contact of the valve jacket and the inner pole.
  • This direct metallic contact of the valve jacket with the inner pole and the associated closed coil space ensure that no further intermediate components are required in a cost-effective, material-saving and component-reducing manner.
  • the configuration allows the best possible selection of materials for the manufacture of the inner pole and valve jacket while maintaining the required soft magnetic properties.
  • the measures listed in the subclaims allow advantageous developments and improvements of the fuel injector specified in the main claim.
  • Fuel injection valve can be produced by means of extrusion molding, which can be carried out particularly cheaply as cold forming.
  • Steels with low tensile strengths (unalloyed steels) as well as steels with high tensile strengths (high-alloy steels) are suitable for cold extrusion.
  • Unalloyed steels definitely reach strength values (tensile strength, hardness) of alloyed steels in the annealed condition after cold extrusion.
  • the great advantage of extruding the inner pole is that it is less
  • FIG. 1 shows a first example of a fuel injector and FIG. 2 shows a second example of a fuel injector.
  • the electromagnetically actuated valve shown in FIG. 1 in the form of a
  • Fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular, extruded core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet connection, as a so-called
  • Inner pole A coil body 3 made of plastic takes up a winding of the magnetic coil 1.
  • the core 2 has a concise taper in its wall thickness in the axial extent of the magnet coil 1.
  • a thin-walled magnetic throttle point 8 is connected in the direction downstream from Rome.
  • This magnetic throttle body 8, which is also tubular, but has a much thinner wall than the wall thicknesses of the core 2 upstream and downstream of the throttle body 8 seen in the axial direction represents the transition from an elongated upper core part 9, which forms the inlet connector in particular, to a lower, comparatively short core end 10.
  • the wall thickness of the thin-walled magnetic choke point 8 is e.g. between 0.2 and 0.5 mm, while the wall thicknesses of the upstream and downstream regions of the core 2 to achieve an optimal magnetic flux, for example in the
  • the annular cross-sectional areas of the core 2 in front of and behind the throttle point 8 have e.g. a size of 20 to 30 mm. These sizes are only for the better
  • the three essential sections 9, 8, 10 of the core 2 are all formed concentrically with a valve longitudinal axis 12.
  • metal, non-magnetic intermediate parts are provided in a large part of the known injection valves of the prior art, which ensure magnetic separation of the core 2 and a downstream connection part serving as valve seat support, but which are dispensed with in the present fuel injection valves can be.
  • the core or inlet connector 2 is made by means of extrusion.
  • extrusion the punch and die form a gap.
  • the stamp presses the workpiece material through the mold gap, the corresponding cross section giving shape.
  • the extrusion of the core 2 is carried out, for example, as cold forming of a corresponding steel.
  • Cold extrusion is unalloyed Steel grades with tensile strengths of 350 N / mm 2 up to high-alloy steels with tensile strengths of 800 N / mm are possible.
  • the fuel injection valve has a thin-walled, sleeve-shaped valve jacket 14, which is preferably produced by deep drawing and serves as a housing, as part of the magnetic circuit and as a valve seat support, which at least partially radially as a component with a larger diameter than that of the core 2 surrounds.
  • the solenoid 1 with its coil body 3 is embedded between the valve jacket 14 and the core 2 in an annular space 15 provided for this purpose.
  • a longitudinal opening 18 extends into which at least the core end 10 projects in such a way that it bears against the inner wall of the valve jacket 14.
  • the core end 10 is used for
  • valve needle 19 which is connected to a e.g. tubular connecting part 20 is equipped, an armature 22 being attached to its upstream end and a spherical valve closing body 23 being attached to its downstream end.
  • armature 22 being attached to its upstream end
  • armature 22 being attached to its upstream end
  • spherical valve closing body 23 being attached to its downstream end.
  • five flats 24 are provided on the circumference of the valve closing body 23, which is connected to the connecting part 20 by welding, for the fuel to flow past.
  • the fuel injector is actuated electromagnetically in a known manner.
  • the electromagnetic circuit with the solenoid 1, the core 2, the valve jacket 14 and the armature 22 is used.
  • the armature 22 is with the end of the valve closing body 23 facing away Connecting part 20 also connected by a weld seam and aligned with the core part 9 or the stop surface 6 of the core 2.
  • a cylindrical valve seat body 29, which has a valve seat surface 30, is tightly mounted in the longitudinal opening 18 in the downstream end of the valve jacket 14 facing away from the core 2, for example by welding.
  • Longitudinal valve axis 12 is a guide opening 32 of the valve seat body 29.
  • a guide surface 36 is provided, the z. B. is produced by turning and also serves the axial guidance of the valve needle 19, here opposite the core 2 in the region of the throttle point 8.
  • the at least one guide surface 36 can, for. B. as a circumferential continuous guide ring or as a plurality of circumferentially spaced guide surfaces.
  • the spherical valve closing body 23 interacts with the valve seat surface 30 of the valve seat body 29 that tapers in the shape of a truncated cone in the direction of flow.
  • the valve seat body 29 On its end face facing away from the valve closing body 23, the valve seat body 29 is firmly connected to a spray-perforated disk 34, for example in the form of a pot.
  • the spray orifice plate 34 has at least one, for example four, spray openings 35 formed by eroding or stamping.
  • the insertion depth of the valve seat body 29 determines the size of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 when the magnet coil 1 is not energized is determined by the valve closing body 23 resting on the valve seat surface 30 of the valve seat body 29, while the other end position of the valve needle 19 is fixed
  • the armature 22 abuts the hard-chromed stop surface 6 of the shoulder 5 of the core 2, for example.
  • a e.g. arranged in the form of an O-ring sealing ring 37 which ensures a seal of the coil space.
  • the annular chamber serving to receive the sealing ring 37 is limited by the underside of the coil former 3, the inner wall of the valve jacket 14, which is stepped in this area and tapers in diameter in the downstream direction, and the outer circumference of the core end 10, which serves on the inside for the anchor guide.
  • a fuel filter 40 protrudes into the flow bore 38 of the core 2 at its end on the inlet side and provides for the filtering out of those fuel components which, because of their size, could cause blockages or damage in the injection valve.
  • the core (inner pole, inlet connector) 2 is largely enclosed with a plastic encapsulation 42 above a radially outwardly extending collar 41, which closes off the space 15 accommodating the magnetic coil 1 at the top.
  • This plastic encapsulation 42 includes, for example, an injection-molded electrical connector 43 which, for example, projects radially outward directly above the collar 41 of the core 2 and the upper end of the valve jacket 14 facing the inlet end of the injection valve.
  • the connector 43 made of plastic includes, for example, two metallic contact pins 44 which are directly connected to the winding of the magnetic coil 1.
  • the contact pins 44 protrude toward the connector 43 out of the coil body 3 through a recess 47 in the collar 41. In this recess 47 are the
  • Contact pins 44 are overmolded with plastic, since the plastic overmolding 42 e.g. extends into the space 15 accommodating the magnetic coil 1 between the valve jacket 14 and the core 2, so that this space 15 is largely injection molded with plastic in addition to the coil body 3.
  • the valve jacket 14 is by several circumferentially attached, e.g. welding spots 45 generated by means of a laser are attached to the collar 41 of the core 2. This fixed connection does not have to fulfill any sealing functions. However, a circumferential, continuous weld 45 can also be provided.
  • the deep-drawn valve jacket 14 has, near its downstream end, a circumferential annular bead 49, which is formed by folding and is perpendicular to the axial extension of the valve jacket 14, while the valve jacket 14 has an outwardly facing collar 50 in the form of a bulge at its immediate downstream end .
  • the annular bead 49 and the collar 50 together with the outer wall of the valve jacket 14 in this area an annular groove 51 in which a sealing ring 52 is arranged for sealing against a valve seat.
  • the fuel injection valve according to FIG. 2 also has the tubular, extruded core 2 which is surrounded by the magnet coil 1, but which is not as immediate as in the example shown in FIG. 1
  • Fuel inlet connector is used, but is formed in one piece downstream with the valve seat support 14 ', which together form the component referred to as valve tube 55.
  • the thin-walled magnetic throttle point 8 follows in the downstream direction.
  • This wall which is substantially thinner than the wall thicknesses of the valve tube 55 upstream and downstream of the throttle point 8, represents the transition of the core 2 to the valve seat support 14 'seen in the axial direction.
  • the extruded valve seat support 14' has one near its downstream end Annular groove 51, in which a sealing ring 52 is arranged for sealing against a valve seat.
  • the fuel injector Concentric to the longitudinal axis of the valve 12, the fuel injector has the thin-walled, sleeve-shaped, preferably produced by deep drawing and as a housing, as part of the magnetic circuit and as
  • the solenoid 1 with its coil body 3 is in turn embedded between the valve jacket 14 and the valve tube 55 in an annular space 15 provided for this purpose.
  • valve tube 55 again has an inner longitudinal opening 18 through which the fuel flows.
  • the valve needle 19 is arranged, which is formed at least by the armature 22 and the spherical valve closing body 23 attached to its downstream end.
  • the valve needle is shortened compared to the first exemplary embodiment, since a connecting part 20 is dispensed with.
  • the valve inlet connector 56 as part of the valve jacket 14 is largely enclosed with the plastic encapsulation 42.
  • This plastic encapsulation 42 includes a molded-on electrical connector 43 which, for example, projects radially outward immediately above a radial shoulder 59 of the valve jacket 14.
  • valve jacket 14 has a larger diameter in the area of extension of the solenoid 1 than in the area of the valve inlet connector 56, which ultimately creates the space 15 for receiving the solenoid 1.
  • the connector 43 made of plastic includes, for example, two metallic contact pins 44 which are directly connected to the winding of the magnetic coil 1. The contact pins 44 protrude to
  • valve jacket 14 is e.g. a plurality of circumferentially attached welding spots 45 ′ generated by means of a laser or a continuous circumferential weld seam are attached to the valve tube 55. This fixed connection does not have to perform a sealing function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne une soupape d'injection de carburant qui comporte un corps de base métallique qui s'étend sur toute sa longueur axiale et est lui-même constitué d'un noyau/pôle intérieur (2) et d'une enveloppe de soupape (14). Le pôle intérieur (2) est produit par extrusion et comporte une conduite d'admission, le noyau (2) proprement dit du circuit électromagnétique, un point d'étranglement magnétique (8) et une zone servant au guidage d'un induit (22). Par contre, l'enveloppe de soupape (14) est produite par emboutissage profond. Cette enveloppe de soupape (14) sert non seulement de boîtier mais également de support de siège de soupape. Entre l'enveloppe de soupape (14) et le pôle intérieur (2) est formé un espace intermédiaire (15) dans lequel se trouve une bobine magnétique (1) qui reste sèche puisque cet espace est rendu étanche au moyen d'un joint d'étanchéité (37). La soupape d'injection de carburant selon l'invention est particulièrement destinée au montage dans des installations d'injection de carburant de moteurs à combustion interne à compression du mélange et à allumage par étincelles.
EP98947358A 1997-10-10 1998-07-28 Soupape d'injection de carburant Expired - Lifetime EP0944769B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19744739A DE19744739A1 (de) 1997-10-10 1997-10-10 Brennstoffeinspritzventil
DE19744739 1997-10-10
PCT/DE1998/002134 WO1999019620A1 (fr) 1997-10-10 1998-07-28 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0944769A1 true EP0944769A1 (fr) 1999-09-29
EP0944769B1 EP0944769B1 (fr) 2003-05-07

Family

ID=7845129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98947358A Expired - Lifetime EP0944769B1 (fr) 1997-10-10 1998-07-28 Soupape d'injection de carburant

Country Status (10)

Country Link
US (1) US6186472B1 (fr)
EP (1) EP0944769B1 (fr)
JP (1) JP4180122B2 (fr)
KR (1) KR100573190B1 (fr)
CN (1) CN1138915C (fr)
AT (1) ATE239867T1 (fr)
BR (1) BR9806699A (fr)
DE (2) DE19744739A1 (fr)
ES (1) ES2199465T3 (fr)
WO (1) WO1999019620A1 (fr)

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US6511003B2 (en) 2000-12-29 2003-01-28 Siemens Automotive Corporation Modular fuel injector having an integral or interchangeable inlet tube and having a terminal connector interconnecting an electromagnetic actuator with an electrical terminal
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US6655609B2 (en) 2000-12-29 2003-12-02 Siemens Automotive Corporation Modular fuel injector having a low mass, high efficiency electromagnetic actuator and having an integral filter and o-ring retainer assembly
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BR9806699A (pt) 2000-02-29
CN1241241A (zh) 2000-01-12
KR20000069385A (ko) 2000-11-25
US6186472B1 (en) 2001-02-13
JP4180122B2 (ja) 2008-11-12
ES2199465T3 (es) 2004-02-16
EP0944769B1 (fr) 2003-05-07
CN1138915C (zh) 2004-02-18
DE19744739A1 (de) 1999-04-15
JP2001505979A (ja) 2001-05-08
WO1999019620A1 (fr) 1999-04-22
ATE239867T1 (de) 2003-05-15
DE59808268D1 (de) 2003-06-12
KR100573190B1 (ko) 2006-04-24

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