EP2863043B1 - Kraftstoffeinspritzdüse - Google Patents

Kraftstoffeinspritzdüse Download PDF

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Publication number
EP2863043B1
EP2863043B1 EP13188728.3A EP13188728A EP2863043B1 EP 2863043 B1 EP2863043 B1 EP 2863043B1 EP 13188728 A EP13188728 A EP 13188728A EP 2863043 B1 EP2863043 B1 EP 2863043B1
Authority
EP
European Patent Office
Prior art keywords
section
separation ring
fuel injector
armature
needle
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.)
Active
Application number
EP13188728.3A
Other languages
English (en)
French (fr)
Other versions
EP2863043A1 (de
Inventor
Stefano Filippi
Valerio Polidori
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP13188728.3A priority Critical patent/EP2863043B1/de
Publication of EP2863043A1 publication Critical patent/EP2863043A1/de
Application granted granted Critical
Publication of EP2863043B1 publication Critical patent/EP2863043B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/06—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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/08—Fuel-injection apparatus having special means for influencing magnetic flux, e.g. for shielding or guiding magnetic flux
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F02M2200/9069—Non-magnetic metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to a fuel injector for injecting fuel into a combustion engine, the fuel injector comprising an armature, a needle, a coil, a casing and a valve body, wherein the coil is arranged in a casing, wherein the armature and the needle are at least partially arranged in the valve body, wherein the coil is electrically connectable to a control device in order to generate a magnetic field, wherein the armature is connected to the needle, wherein the armature is configured to interact with the magnetic field in order to move the needle between an open position and a closed position wherein the casing is arranged on an outer peripheral surface of the valve body.
  • WO 2012/160100 A1 teaches an injector for injecting fluid comprising a valve needle being axially moveable with respect to a valve body and being operable to prevent a fluid injection in a closed position and to permit the fluid injection in an open position, an armature for moving the valve needle in a first direction from the closed position towards the open position, a needle retainer which is fixed to the valve needle, an armature holder which is fixed to the armature, a needle retainer and the armature holder are releasable compoundable in such way that when the armature moves in the first direction, the needle is moved in the first direction by the movement of the armature holder and the needle retainer.
  • WO 2005/001279 A1 discloses a modular fuel injector for an internal combustion engine, including a valve group subassembly and a power group subassembly.
  • the valve group subassembly includes a first stator member defining a fluid passage, a second stator member, a non-magnetic shell disposed between the first and second stator members, a valve body, and an armature member.
  • the armature member defines a first working air gap with the first stator member and a second working air gap with the second stator member.
  • the armature member includes a closure member proximate an outlet end and contiguous to a seat in a first configuration.
  • the power group subassembly includes an electromagnetic coil surrounding the fluid passage, a housing encasing the coil, and an overmold encapsulating the coil and the housing.
  • JP 2010-053812 A relates to an electromagnetic actuator which airtightly seals a stator containing space of a main stator relative to an armature containing space of a containing armature by using a first magnetic ring of an auxiliary stator and a complete cycle welding portion of a barrier body, a second magnetic ring of the auxiliary stator and a complete-cycle welding portion of a middle housing, a complete cycle welding portion of the first magnetic ring and the non-magnetic ring of the auxiliary stator, a complete cycle welding portion of the second magnetic ring and the non-magnetic ring of the auxiliary stator, a complete cycle welding portion of the middle housing and an upper housing, and the like.
  • JP 2010-084165 A provides a method for producing a composite sintered compact which can efficiently produce a composite sintered compact of high quality composed of different kinds of metallic materials per parts by setting an atmospheric gas upon sintering.
  • the method comprises: a molding stage where, using a first kneaded matter comprising first metal powder and a binder and a second kneaded matter comprising second metal powder having a composition and crystal structure different from those of the first metal powder and a binder, a secondary molded body is produced in such a manner that, in the respective kneaded matters, the second kneaded matter is subjected to insert-molding with the primary molded body of the first kneaded matter as an insert work; and a firing stage where the second molded body is fired so as to obtain a composite sintered compact, wherein, the atmospheric gas in the firing stage is set in such a manner that the crystal structure of the second metal powder shifts to the structure same as that of the first metal powder.
  • a solenoid actuator for use in a fuel injection system.
  • the actuator comprises a generally cylindrical core member having a longitudinal axis and defining, at an end thereof, an inner pole face of the actuator, a wire coil disposed around the core member and arranged to be connected to a power source in use so as to generate a magnetic field around the coil, an outer ring arranged concentrically around the end of the core member and defining an outer pole face of the actuator, the outer and inner pole faces being substantially co-planar, and a support ring of non-magnetic material having a relatively low magnetic permeability, the support ring being disposed between the end of the core member and the outer ring.
  • the actuator is receivable in a recess in a housing, and is arranged such that substantially all of the flux in a part of a of a magnetic circuit defined by the magnetic field is guided to pass between the outer ring and the housing in use of the actuator.
  • US 6,244,526 B1 relates to a fuel injection valve for fuel injection systems of internal combustion engines which includes a core which serves as the internal pole is made of a soft magnetic powder composite material.
  • This powder composite material is an iron powder provided with a polymer additive, where the individual iron particles are coated with an electrically insulating layer.
  • Such a powder composite material ensures a substantial minimization of eddy currents in the magnetic circuit in comparison with materials known previously, such as chromium steel, which are usually used as magnetic materials.
  • the core which is mechanically sensitive and is sensitive to fuel is encapsulated at least with respect to the parts of the injection valve carrying the fuel.
  • a sleeve passes through an internal longitudinal opening in the core which permits fuel flow in its interior and is fixedly attached to a pole part which seals the core toward the bottom.
  • the core and the magnetic coil are thus not exposed to any wetting by fuel.
  • This fuel injection valve is especially suitable for use in fuel injection systems of internal combustion engines with mixture compression and external ignition.
  • a fuel injector assembly disclosed by US 2003/178509 A1 includes a valve to selectively prevent fuel from flowing therethrough.
  • An armature is fixedly mounted onto the valve, and a solenoid is adapted to generate a magnetic flux within the fuel injector to provide a magnetic force on the armature.
  • a flux washer is disposed between the solenoid and the armature and provides a path for the magnetic flux.
  • US 2008/237520 A1 relates to a solenoid valve which includes a movable core, a magnetic opposed portion opposed to the movable core, a nonmagnetic cylindrical portion, a first magnetic cylindrical portion axially close to the movable core, and a second magnetic cylindrical portion located radially outside of the magnetic opposed portion.
  • the nonmagnetic cylindrical portion surrounds radially outside of a gap between the magnetic opposed portion and the movable core.
  • a coil is provided radially outside of the nonmagnetic cylindrical portion.
  • JP 2005307751 provides a fuel injection valve provided with a flat plate type movable core and a flat plate type electromagnetic driving part in which a coil is arranged between fixed cores and capable of preventing intrusion of fuel into the coil and preventing the fixed cores from being adversely affected.
  • the fuel injection valve is constituted in such a way that it is provided with valve parts, and the electromagnetic driving part having the movable core, the fixed cores, and the coil, the fixed core has an inner peripheral side core part and an outer peripheral side core part extending in the axial direction across the wound coil, both of these core parts, are arranged by opposing to the movable core on end faces mutually, and the valve parts shut off and allow fuel injection by being driven by the electromagnetic driving part.
  • This fuel injection valve has a cover covering end faces of both of core parts, and the coil.
  • an improved fuel injector may be provided by a fuel injector comprising an armature, a needle, a coil, a casing and a valve body wherein the coil is arranged in the casing.
  • the armature and the needle are at least partially arranged in the valve body.
  • the coil is electrically connectable to a control device in order to generate a magnetic field.
  • the armature is connected to the needle.
  • the armature is configured to interact with the magnetic field in order to displace the needle from a closed position towards an open position along a longitudinal axis of the valve body.
  • the armature is positionally fixed with respect to the needle.
  • the armature is axially displaceable with respect to the needle and the relative axial displacement is limited so that the armature is operable to take the needle with it for axially displacing the needle away from the closing position.
  • the armature is configured to interact with the magnetic field in order to displace the needle
  • the armature is displaceable by the coil by means of the electromagnetic field to travel in axial direction with respect to the valve body, in particular towards the housing and that the armature is further configured for mechanically interacting with the needle for axially displacing the needle away from the closing position.
  • the casing is arranged on an outer peripheral surface of a portion of the valve body.
  • the valve body comprises a plurality of separately manufactured parts and the casing surrounds at least one of the parts.
  • the separation ring is in particular one of a plurality of parts of the valve body.
  • the separation ring is at least partially arranged between the casing and the armature. In particular, it is configured to lead the magnetic field to the armature. That the separation ring is configured to lead the magnetic field to the armature in particular means that the separation ring is in a magnetic path of the injector.
  • the magnetic path is in particular established at least by the coil, the housing, the separation ring and the armature. For example, the magnetic path goes to an interior of the valve body through the separation ring.
  • the separation ring contributes to shaping the magnetic field.
  • the separation ring comprises a first section with a first material and at least a second section with a second material.
  • the first material differs from the second material.
  • the first material and the second material have mutually different magnetic properties.
  • This configuration provides an improved magnetic performance of the injector with an isolated coil and a high-pressure direct injection application. Moreover, a wet area can easily be separated from the coil in order to avoid external leakage. Furthermore, a force of the coil on the armature can be increased so that the fuel injector can easily be adapted to an increased fuel pressure.
  • the valve body comprises a tubular inner section and at least a tubular outer section wherein the separation ring is arranged in a radial direction between the inner section and the outer section.
  • the inner section has an outer diameter which is smaller than an inner diameter of the outer section.
  • the tubular inner section is for example comprised by a first part of the valve body and the tubular outer section is for example comprised by a second part of the valve body, the second part being arranged axially subsequent to the first part.
  • valve body comprising the first part, the separation ring and the second part can be easily assembled.
  • the separation ring is materially connected to the inner section and/or the outer section of the valve body.
  • the separation ring connects a downstream end of the first part of the valve body with an upstream end of the second part of the valve body in fluid-tight fashion.
  • a welded connection provides a good sealing of the wet area of the fuel injector and the coil.
  • the first section of the separation ring comprises at least a separation ring base body
  • the second section comprises at least a separation ring insert.
  • the first section is represented by the separation ring base body
  • the second section is represented by the separation ring insert.
  • the separation ring base body comprises at least an opening, the opening being shaped correspondingly to the separation ring insert and configured to at least partly receive the separation ring insert.
  • This configuration can easily be produced in a metal-injecting moulding process so that the separation ring can be produced in a cost-efficient manner.
  • the separation ring insert and the opening of the separation ring base body are at least partly ring-shaped, i.e. in the form of a ring or of a ring-segment. This design allows an advantageous shaping of the magnetic flux through the separation ring.
  • the separation ring base body comprises the first material and the separation ring insert comprises the second material.
  • the separation ring base body is made from the first material, i.e. it consists of the first material
  • the separation ring insert is made from the second material, i.e. it consists of the second material. This configuration precisely delimits the first material from the second material so that the magnetic flux through the separation ring can easily be defined by the arrangement of the separation ring insert in the separation ring base body.
  • the opening encloses an angle of approximately 90°.
  • the angle is in particular measured in a radial plane with respect to the longitudinal axis and has its apex on the longitudinal axis.
  • "Approximately 90°" in this context is in particular to be understood that there may be bars for connecting different sections of the separation ring (see below) and the angle differs from 90 ° due to the size of these bars.
  • This configuration is highly symmetric so that non-axial forces acting on the armature can be particularly small.
  • the configuration may also be highly cost-efficient.
  • the separation ring comprises an inner section and an outer section wherein the outer section is arranged in a radial direction outside of the inner section and is connected to the inner section via at least one bar, wherein the opening is arranged between the inner section and the outer section, wherein the bar is configured to carry the separation ring insert.
  • the separation ring insert bears on the bar(s). This configuration provides a good mechanical support for the separation ring insert.
  • the first material is magnetic and the second material is non-magnetic.
  • the first material has a larger magnetic permeability than the second material.
  • the magnetic permeability of the first material may be at least 10 times, preferably at least 100 times, in particular at least 300 times as large as the magnetic permeability of the second material.
  • the first material is a ferritic steel and the second material is an austenitic steel.
  • the separation ring is manufactured in a metal-injection moulding process. This process is particularly suitable to provide a hermetically sealed-off separation ring.
  • the fuel injector comprises a dry section and a wet section.
  • the wet section is configured to guide fuel through the fuel injector wherein the needle and the armature are arranged in the wet section.
  • the coil and the casing are arranged in the dry section.
  • the wet section is separated from the dry section at least by the separation ring.
  • the valve body separates the dry section from the wet section and the separation ring is comprised by the valve body. Due to the separation of the coil from the wet section, a magnetic field is not influenced by the fuel in the wet section.
  • Figure 1 depicts a longitudinal section through a fuel injector 10 according to a first embodiment and Figure 2 shows a detail of the longitudinal section of the fuel injector 10 shown in Figure 1 .
  • the fuel injector 10 comprises a casing 15 and a valve body 20.
  • the fuel injector 10 comprises an actuator 21.
  • a coil 25 of the actuator 21 is arranged in the casing 15.
  • the coil 25 is electrically connected with a control device 30.
  • the control device 30 controls a current through the coil 25 in order to generate an electromagnetic field 26.
  • the actuator 21 is designed to trip a valve unit 45 of the fuel injector.
  • the fuel injector 10 comprises a longitudinal axis 35 alongside which a needle 40 of a valve unit 45 of the fuel injector 10 may be moved.
  • the valve unit 45 comprises a valve seat body 50 and a valve closing member 55, as well, the valve closing member 55 being arranged at a first axial end of the fuel injector 10.
  • the first axial end may be configured to protrude into a combustion chamber 60 of an internal combustion engine, for example. Alternatively, it may protrude into an intake manifold of the internal combustion engine, for example.
  • the valve closing member 55 is received in the valve seat body 50.
  • the valve closing member 55 is ball-shaped and closes a first opening 65 of the valve seat body 50 in a closed position of the valve unit 45.
  • the first opening 65 is located beneath the valve closing member 55.
  • the valve closing member 55 is in contact with the needle 40.
  • the valve closing member 55 may expediently be fixed to the needle 40.
  • the needle 40 is solid in the present embodiment.
  • the needle 40 can also be designed as a hollow needle.
  • the valve body 20 comprises a needle section 70, a first part representing an inner-tubular section 75 and a second part representing an outer tubular section 80.
  • the needle section 70 receives the needle 40 and the forms a first channel 85 between an outer peripheral surface 90 of the needle 40 and an inner peripheral surface 95 of the needle section 70.
  • the valve seat body 50 is positioned in the needle section 70 and fixed thereto.
  • the needle section 70 comprises a ledge 100.
  • the first channel 85 ends at the ledge 100.
  • the needle section 70 comprises a first collar 105.
  • the collar 105 is arranged in the second tubular section 80 of the valve body 20.
  • the second tubular section 80, the needle section 70 and the collar 105 seal off a wet section 110 against the environment of the fuel injector 10.
  • fuel 115 is transported to the valve seat body 50.
  • a guiding disc 120 is in touch with the ledge 100.
  • the first collar 105 is arranged on the outside in a radial manner with regard to the guiding disc 120.
  • the guiding disc receives the needle 40 and comprises a second channel 121.
  • the second channel 121 is hydraulically connected with the first channel 85.
  • the second tubular section 80 is arranged between the casing 15 and the needle section 70.
  • the second tubular section 80 borders on an armature room 125.
  • the armature room 125 is part of the wet section 110.
  • an armature 130 is located in the armature room 125.
  • the armature 130 comprises a magnetic material such as ferritic steel.
  • the armature 130 also comprises a third channel 135.
  • the armature 130 is connected to the needle 40.
  • the needle 40 extends through a central opening 140 of the armature 130.
  • the needle 40 comprises a thickening 145 with a diameter which is larger than a diameter of the central opening 140. This configuration provides a good force transfer from the armature 130 to the needle 40 by means of a mechanical coupling, in particular a form-fit coupling.
  • the separation ring is a portion of the valve body 20.
  • the separation ring 150 is arranged in a plane vertical to the longitudinal axis 35. In other words, a central axis of the ring is parallel - in particular coaxial - to the longitudinal axis.
  • the separation ring 150 is arranged between the first tubular section 75 and the second tubular section 80 in radial direction.
  • the separation ring 150 is connected with a first welded connection 155 with the first tubular section 75 and with a second welded connection 160 with the second tubular section 80 in fluid-tight fashion.
  • the separation ring 150 and the first tubular section 75 separate - i.e. hydraulically seal or at least contribute to hydraulically sealing - the wet section 110 of the fuel injector 10 from a dry section 165 of the fuel injector 10.
  • the dry section 165 is delimited by the casing 15 and the separation ring 150 on the opposite side of armature 130.
  • the casing 15 has a U-shaped cross-section.
  • the casing 15 surrounds the first tubular section 75.
  • the coil 25 is arranged in the casing 15, specifically in the recess of the U-shape.
  • the thickening 145 of the needle 40 is arranged in the first tubular section 75.
  • the thickening 145 may cooperate with the first tubular section 75 for axially guiding the needle 40.
  • a spring 170 and a fastening means 175 are located in the first tubular section 75.
  • the fastening means 175 fastens the spring 170 on a first longitudinal end of the spring 170.
  • the spring 170 is in contact with the needle 40.
  • a fluid inlet tube 180 is arranged adjacent to the upper side of the casing 15 and hydraulically connected to the first tubular section 75 of the valve body 20.
  • the fuel injector 10 can be connected to a pipe system and to a high-pressure pump.
  • the high pressure pump is configured to pressurize the fuel 115 and provide it to the fuel injector 10.
  • the fluid inlet tube 180 surrounds the fastening means 175 at a needle 40 averted end of the first tubular section 75.
  • Fuel 115 coming from the high-pressure pump is pumped through the fluid inlet tube 180, enters the valve body 20 through the fastening means 175 which may comprise a fluid filter.
  • the fluid flows further through the first tubular section 75 alongside or through the spring to the needle 40 and further alongside the solid needle 40.
  • the fuel 115 flows through the third channel 135 via the armature 130.
  • the guiding disc 120 provides a third channel 135 to connect the second channel 121 via the third channel 135 to the first channel 85.
  • the fuel flows along the needle 40 down to the valve seat body 50.
  • the fuel 115 passes the first opening 65 and is injected into the combustion chamber 60.
  • the valve unit 45 is controlled by the actuator 21.
  • the control device 30 provides electric energy to the coil 25, the coil 25 generates the electromagnetic field 26.
  • the electromagnetic field 26 penetrates the separation ring 150 and interacts with the armature 130.
  • the armature 130 In the closed position, the armature 130 is spaced with regard to the separation ring 150 (cf. Figure 1 , roughly indicated by the dotted lines representing the respective displacement of the armature 130 in exaggerated fashion).
  • the spring 170 is mounted between the needle 40 and the fastening means 175 in a pre-stressed manner.
  • the spring 170 provides a spring force F S .
  • the spring force F S has a direction parallel to the longitudinal axis 35 in the direction towards the valve seat body 50.
  • the spring 170 presses the needle 40 and the armature 130 in the direction of the valve seat body 50 with the spring force F S .
  • the needle 40 presses the valve closing member 55 onto the first opening 65 so that no fuel 115 can be injected into the combustion chamber 60.
  • the armature 130 comprises ferromagnetic material.
  • the armature 130 is attracted by the electromagnetic field 26 in the direction towards the coil 25.
  • the electromagnetic field 26 produces a magnetic force F M by interacting with the armature 130, which has a direction parallel to the longitudinal axis 35 in the direction of the coil 25.
  • the armature 130 presses against the thickening 145 of the needle 40.
  • the thickening 145 presses against the spring 170.
  • the coil 25, the separation ring 150 and the armature 130 are located on the same radial distance to the longitudinal axis 35. To put it in another way, the coil 25, the separation ring 150 and the armature 130 overlap in top view along the longitudinal axis 35. This provides an increased electromagnetic force F M on the armature. Through the increased electromagnetic force F M , the spring 170 can be strengthened and can provide a higher spring force F S . In result the closed position of the valve unit 45 can be secured even by an increase of the pressure of the fuel 115. Also, by means of this arrangement, the magnetic flux through the casing 15 and the armature 130 can be optimized.
  • Figure 3 shows a perspective view onto a bottom-side of the separation ring 150.
  • Figure 4 shows a perspective view of the top side of the separation ring 150 shown in Figure 3.
  • Figure 5 depicts a perspective view onto a bottom-side of a separation ring base body 195 of the separation ring 150 shown in Figure 3.
  • Figure 6 shows a top side of the separation ring base body 195 shown in Figure 5 .
  • the separation ring 150 comprises a third opening 200 through which the needle 40 is guided.
  • a second collar 205 is located.
  • the first tubular section 75 is welded with the first welded connection 155.
  • the separation ring base body 195 comprises an inner section 210 and an outer section 215.
  • the inner section 210 is radially arranged outside of the second collar 205 and merges with the second collar 205.
  • the outer section 215 is radially arranged on the outside of the inner section 210.
  • four partly ring-shaped fourth openings 220 are arranged.
  • the inner section 210 is connected to the outer section 215 with bars 225.
  • the fourth openings 220 each cover an angle of 90° except for the size of the bars 225. Alternatively, every other angle may be covered by the fourth openings 220.
  • the bars 225 By means of the bars 225, a mechanical connection can be provided between the inner section 210 and the outer section 215.
  • the bars 225 have a smaller longitudinal extension than each of the inner section 210 and the outer section 215.
  • the separation ring base body 195 consists of a first material.
  • the first material is ferromagnetic.
  • the first material could be stainless steel having the SAE steel grade 430.
  • every other ferromagnetic steel would be also possible.
  • a separation ring insert 230 is arranged in the fourth openings 220.
  • the separation ring insert 230 spans all four fourth openings 22.
  • the separation ring insert 230 comprises the same thickness in longitudinal direction as the inner section 210 or the outer section 215.
  • the thickness of the separation ring insert 230 is only reduced in the area of the bars 225 in order to provide a flat surface on both sides of the separation ring 150.
  • the separation ring insert 230 consists of a second material.
  • the second material is non-magnetic.
  • it is an austenitic steel, e.g. stainless steel having the SAE steel grade 304.
  • every other austenitic steel would be also possible.
  • the second material differs from the first material in its magnetically permeability.
  • the first material advantageously comprises a magnetic constant ⁇ r , which is higher than 10, preferably higher than 100.
  • the magnetic constant ⁇ r is also known as relative magnetic permeability.
  • the second material comprises a magnetic constant ⁇ r , which is lower than 10, particularly between 1 and 10.
  • the magnetic constant ⁇ r of the first material may be higher than 1 and the magnetic constant ⁇ r of the second material may be lower than 1.
  • the inner section 210 is located directly adjoining an inner section 235 of the casing 15.
  • the casing 15 comprises an outer section 240.
  • the outer section 240 of the casing 15 is spaced with regard to the inner section 235 of the casing in a radial direction and is connected with the inner section 235 on the opposite site of the separation ring by means of a connection section 241, so that the casing 15 has a U-shaped cross-section.
  • the coil 25 is arranged between the inner section 235 and the outer section 240 in radial direction in the recess of the U-shape.
  • the outer section 240 of the casing 15 is located directly adjoining the outer section 215 of the separation ring 150.
  • the inner section 235 and the outer section 240 of the casing 15 have nearly the same radial extension as the inner section 210 and the outer section 215 of the separation ring 150, respectively.
  • the separation ring insert 230 has the radial extension of the recess between the inner and outer sections 235, 240 of the casing 15.
  • the arrangement of the inner sections 210 of the separation ring 150 to the inner section 235 of the casing 15 and the arrangement of the outer section 240 of the separation ring 150 to the outer section 240 of the casing 15 may also be different. Also the arrangement of the coil 25 with regard to the separation ring inlet 230 may be different.
  • the electromagnetic field 26 builds a first magnetic pole (i.e. in Fig. 2 an north pole) on a surface 245 of the outer section 240 of the casing 15 which surface 245 faces towards the armature 130. Due to the direct contact of the outer section 215 of the separation ring 150 to the outer section 240 of the casing 15, the first pole is also located in the outer section 215 of the separation ring 150.
  • a second magnetic pole i.e. in Fig. 2 a south pole is located on the surface 245 at the inner section 135 of the casing 15.
  • the direct contact of the inner section 210 of the separation ring 150 to the inner section 235 of the casing the second pole is also located at the inner section 210 of the separation ring 150.
  • the magnetic material of the armature 130 is designed to close the magnetic path of the electromagnetic field 26, so that the armature 130 is attracted to the magnetic poles and presses the needle 40 against the spring 170 to open the valve unit 45.
  • the non-magnetic material of the separation ring insert 230 provides a flux of the magnetic field 26 through the casing 15 and the armature 130.
  • the electromagnetic field 26 is not short-circuited by the separation ring 150, so that an improved leading of the electromagnetic field by the separation ring 150 can be provided.
  • Parasitic magnetic flux through the separation ring 150 in radial direction is particularly small.
  • the coil 25 is protected against the wet room 110 and chemical attacks.
  • the separation ring 150 prevents an external leakage and provides an adequate structural resistance against the forces resulting from the magnetic field and the highly pressurized fuel 115.
  • the first tubular section and/or the second tubular section 80 can be made from non-magnetic materials, e.g. with austenitic material, particularly e.g. with stainless steel having the SAE steel grade 304.
  • the separation ring 150 may be produced by a metal-injection moulding process wherein both the first and the second material may be arranged according to the above-described structure.
  • the casing 15 may be realized e.g. with an overmoulded layer of plastic compound.
  • the fuel injector 10 comprises an inward opening valve unit 45.
  • the actuator 21 could also be used for an outward opening fuel injector, i.e. a fluid injector that opens by means of displacement of the needle 40 in the direction of the fluid flow.
  • FIG 7 shows a longitudinal section through a fuel injector 300 according to a second embodiment.
  • the fuel injector 300 has in general the same design as the fuel injector 10 shown in Figures 1 to 6 . Different thereto, the fuel injector 300 according to the present embodiment is an outward opening fuel injector.
  • the needle 40 is opened in direction of the fluid flow - out in direction of the combustion chamber 60 for example. Consequently, the casing 15 has its U-shape open side opened in the direction of the fluid inlet tube 180.
  • the separation ring 150 is arranged subsequent to the casing 15 and the armature 130 subsequent to the separation ring 150 in longitudinal direction 35 away from the valve seat body 50 and towards the fluid inlet tube 180.
  • the separation ring 150 has the same design as shown in Figures 3 to 6 and it is connected to an inner tubular section 75 and an outer tubular section 80 of the valve body 20.
  • the separation ring 150 of this and other embodiments may have a small longitudinal extension, e.g. starting from 0.5 mm.
  • the separation ring 150 could also have a different longitudinal extension.
  • the casing 15 may be protected from the fuel or other aggressive substances in the fuel injector 10. Moreover, the different materials of the separation ring 150 guarantee an adequate forwarding of the electromagnetic field on the armature 130. In a combination of the design of the casing 15 and the separation ring 150, the radial force on the armature 130 could be minimized.

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)

Claims (11)

  1. Kraftstoffinjektor (10; 300) zum Einspritzen von Kraftstoff (115) in einen Verbrennungsmotor, wobei der Kraftstoffinjektor (10; 300) einen Anker (130), eine Nadel (40), eine Spule (25), ein Gehäuse (15), einen Ventilkörper (20) und einen Trennring (150) aufweist, wobei
    - die Spule (25) in dem Gehäuse (15) angeordnet ist,
    - der Anker (130) und die Nadel (40) mindestens teilweise in dem Ventilkörper (20) angeordnet sind,
    - die Spule (25) mit einer Steuervorrichtung (30) elektrisch verbindbar ist, um ein elektromagnetisches Feld (26) zu erzeugen,
    - der Anker (130) mit der Nadel (40) verbunden ist,
    - der Anker (130) zum Interagieren mit dem elektromagnetischen Feld (26) ausgebildet ist, um die Nadel (40) aus einer geschlossenen Position zu einer offenen Position entlang einer Längsachse (35) des Ventilkörpers (20) zu bewegen,
    - der Trennring (150) mindestens teilweise zwischen dem Gehäuse (15) und dem Anker (130) angeordnet ist und zum Führen des elektromagnetischen Felds (26) zu dem Anker (130) ausgebildet ist,
    - das Gehäuse (15) an einer äußeren peripheren Fläche eines Abschnitts des Ventilkörpers (20) angeordnet ist,
    - der Trennring (150) eine erste Sektion (195) mit einem ersten Material und mindestens eine zweite Sektion (230) mit einem zweiten Material aufweist, wobei sich das erste Material von dem zweiten Material unterscheidet,
    - die erste Sektion (195) des Trennrings (150) mindestens einen Trennring-Basiskörper (195) aufweist, die zweite Sektion (220) mindestens einen Trennringeinsatz (230) aufweist, wobei der Trennring-Basiskörper (195) mindestens eine Öffnung (220) aufweist, die entsprechend dem Trennringeinsatz (230) geformt ist und zum mindestens teilweisen Aufnehmen des Trennringeinsatzes (230) ausgebildet ist,
    - die erste Sektion (195) des Trennrings (150) eine innere Sektion (210) und eine äußere Sektion (215) aufweist, wobei die äußere Sektion (215) in einer radialen Richtung außerhalb der inneren Sektion (210) angeordnet ist,
    dadurch gekennzeichnet, dass die innere Sektion (210) mit der äußeren Sektion (215) über mindestens einen Steg (225) verbunden ist, wobei die Öffnung (220) zwischen der inneren Sektion (210) und der äußeren Sektion (215) angeordnet ist, wobei der Steg (225) zum Tragen der zweiten Sektion (230) ausgebildet ist.
  2. Kraftstoffinjektor (10; 300) nach Anspruch 1, dadurch gekennzeichnet, dass der Trennringeinsatz (230) dieselbe Dicke in der Längsrichtung aufweist wie die innere Sektion (210) oder die äußere Sektion (215), und die Dicke des Trennringeinsatzes (230) nur in dem Bereich der Stege (225) reduziert ist, um eine flache Fläche auf beiden Seiten des Trennrings (150) bereitzustellen.
  3. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilkörper (20) eine rohrförmige innere Sektion (75) und mindestens eine rohrförmige äußere Sektion (80) aufweist, wobei der Trennring (150) in einer radialen Richtung zwischen der inneren Sektion (75) und der äußeren Sektion (80) angeordnet ist.
  4. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Trennring (150) mit dem Ventilkörper (20) materiell verbunden ist (155, 160).
  5. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Trennringeinsatz (230) und die Öffnung (230) des Trennring-Basiskörpers (195) mindestens teilweise ringförmig sind.
  6. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Trennring-Basiskörper (195) das erste Material aufweist, und der Trennringeinsatz (230) das zweite Material aufweist.
  7. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Öffnung einen Winkel von ungefähr 90° umschließt.
  8. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste Material magnetisch ist, und das zweite Material nicht-magnetisch ist.
  9. Kraftstoffinjektor (10; 300) nach dem vorhergehenden Anspruch, wobei das magnetische erste Material ein ferritischer Stahl ist, und das nicht-magnetische zweite Material ein austenitischer Stahl ist.
  10. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Trennring (150) mittels eines Metallspritzgussverfahrens hergestellt ist.
  11. Kraftstoffinjektor (10; 300) nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine trockene Sektion (165) und eine nasse Sektion (110), wobei die nasse Sektion (110) zum Führen des Kraftstoffs (115) durch den Injektor (10; 300) ausgebildet ist, wobei die Nadel (40) und der Anker (130) in der nassen Sektion (110) angeordnet sind, wobei die Spule (25) und das Gehäuse (15) in der trockenen Sektion angeordnet sind, wobei die nasse Sektion (110) von der trockenen Sektion (165) mindestens durch den Trennring (150) abgegrenzt ist.
EP13188728.3A 2013-10-15 2013-10-15 Kraftstoffeinspritzdüse Active EP2863043B1 (de)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13188728.3A EP2863043B1 (de) 2013-10-15 2013-10-15 Kraftstoffeinspritzdüse

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EP2863043B1 true EP2863043B1 (de) 2017-01-04

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3009655B1 (de) 2014-10-13 2017-08-23 Continental Automotive GmbH Kraftstoffeinspritzventil für einen Verbrennungsmotor
DE102015208103A1 (de) * 2015-04-30 2016-11-03 Robert Bosch Gmbh Elektromagnetische Stelleinheit für ein Einspritzventil und Einspritzventil mit einer solchen elektromagnetischen Stelleinheit
GB2615372B (en) * 2022-02-03 2024-02-28 Delphi Tech Ip Ltd Fuel injector

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Publication number Priority date Publication date Assignee Title
DE19639117A1 (de) * 1996-09-24 1998-03-26 Bosch Gmbh Robert Brennstoffeinspritzventil
US20030178509A1 (en) * 2002-03-19 2003-09-25 Visteon Global Technologies, Inc. Fuel injector with flux washer
JP3874698B2 (ja) * 2002-06-05 2007-01-31 株式会社デンソー 電磁弁用ソレノイド
WO2005001279A1 (en) * 2003-06-10 2005-01-06 Siemens Vdo Automotive Corporation Modular fuel injector with di-pole magnetic circuit
JP4134937B2 (ja) * 2004-04-16 2008-08-20 株式会社デンソー 燃料噴射弁
DE102008000797B4 (de) * 2007-03-26 2014-05-22 Denso Corporation Elektromagnetventil und Kraftstoffeinspritzventil mit dem selben
JP4703697B2 (ja) * 2008-08-29 2011-06-15 株式会社日本自動車部品総合研究所 電磁アクチュエータ
JP5223570B2 (ja) * 2008-09-29 2013-06-26 セイコーエプソン株式会社 複合焼結体の製造方法、複合焼結体および燃料噴射弁
EP2320066A1 (de) * 2009-11-06 2011-05-11 Delphi Technologies Holding S.à.r.l. Elektromagnetischer Aktuator
EP2527637B1 (de) 2011-05-23 2014-10-08 Continental Automotive GmbH Injektor zum Einspritzen von Flüssigkeit

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