WO2017154815A1 - 燃料噴射装置 - Google Patents

燃料噴射装置 Download PDF

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Publication number
WO2017154815A1
WO2017154815A1 PCT/JP2017/008691 JP2017008691W WO2017154815A1 WO 2017154815 A1 WO2017154815 A1 WO 2017154815A1 JP 2017008691 W JP2017008691 W JP 2017008691W WO 2017154815 A1 WO2017154815 A1 WO 2017154815A1
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WO
WIPO (PCT)
Prior art keywords
core
movable
movable core
needle
valve seat
Prior art date
Application number
PCT/JP2017/008691
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
孝一 望月
松本　修一
英人 武田
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112017001210.4T priority Critical patent/DE112017001210B4/de
Publication of WO2017154815A1 publication Critical patent/WO2017154815A1/ja

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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
    • 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
    • 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
    • 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
    • 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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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

Definitions

  • the present disclosure relates to a fuel injection device that injects and supplies fuel to an internal combustion engine.
  • a fuel injection device in which a plurality of movable cores are provided for one needle is known.
  • a fuel injection device in which a plurality of movable cores are provided for one needle is known.
  • two movable cores are provided for one needle to realize two needle lift amounts.
  • the first movable core is provided so as to be relatively movable with respect to the needle
  • the second movable core is provided so as not to be relatively movable with respect to the needle.
  • the coil when the coil is not energized, that is, when the needle is in contact with the valve seat and is closed, the first movable core and the second movable core are opposed to each other. Touching. Therefore, the magnetic resistance between the first movable core and the second movable core is small.
  • a magnetic flux flows through the first movable core, and a large amount of magnetic flux also flows through the second movable core.
  • the force for sucking the first movable core toward the fixed core may be reduced.
  • the needle cannot be properly opened at the initial stage of energization of the coil.
  • the coil is energized to such an extent that the needle can be sufficiently opened, power consumption at the initial energization may increase.
  • the opposing surfaces of the first movable core and the second movable core that are in contact with each other at the time of a large stroke of the needle are separated from each other, and a gap is formed therebetween. . Therefore, at this time, there is a possibility that a ringing force, which is a force for preventing separation from each other, is generated between the opposing surfaces. As a result, the valve opening speed of the needle decreases, and a sufficient needle lift amount may not be achieved. Therefore, the fuel injection accuracy may be reduced.
  • the fuel injection device of Patent Document 1 when the needle is closed, that is, in contact with the valve seat in a state where the opposing surfaces of the first movable core and the second movable core are in contact with each other, the first Ringing force is generated between the opposing surfaces of the movable core and the second movable core, and the collision energy when the needle comes into contact with the valve seat may increase. This may cause the needle to bounce at the valve seat and cause an unintended secondary valve opening. Therefore, the fuel injection accuracy may be reduced.
  • the present disclosure has been made in view of the above-described problems, and an object thereof is to provide a fuel injection device that can inject high-pressure fuel with high accuracy.
  • the fuel injection device includes a nozzle, a housing, a needle, a movable core, a fixed core, and a coil.
  • the nozzle has an injection hole through which fuel is injected and a valve seat formed around the injection hole.
  • the housing is formed in a cylindrical shape, has one end connected to the nozzle, and has a fuel passage formed inside so as to communicate with the nozzle hole and guiding fuel to the nozzle hole.
  • the needle is provided so as to be reciprocally movable inside the housing, and opens when one end is separated from the valve seat and closes when one end contacts the valve seat.
  • a plurality of movable cores are provided so as to be movable relative to the needle or not movable relative to the needle.
  • the fixed core is provided on the side opposite to the valve seat with respect to the movable core. When the coil is energized, it generates a magnetic flux, and it is possible to attract the movable core toward the fixed core and move the needle away from the valve seat.
  • an annular movable core is provided between the surface on the fixed core side of one movable core and the surface on the valve seat side of the other movable core different from the one movable core.
  • a gap is formed. Therefore, the magnetic resistance between the plurality of movable cores can be increased.
  • the attractive force between the movable core and the fixed core can be increased. Therefore, even when the fuel pressure in the fuel passage is high, the needle can be opened. Therefore, in this aspect, high-pressure fuel can be injected.
  • the annular gap between the movable cores is formed between the plurality of movable cores, the ringing force generated when the movable cores are about to be separated can be reduced. Therefore, it is possible to suppress a decrease in the valve opening speed of the needle and an unintended secondary valve opening that may occur in the conventional fuel injection device. Therefore, in this aspect, fuel can be injected with high accuracy.
  • the fuel injection device includes a nozzle, a housing, a needle, a movable core, a fixed core, and a coil.
  • the housing or the fixed core has a contact surface that can contact the surface of the fixed core or the needle of at least one of the plurality of movable cores.
  • An annular inter-core gap is formed between the movable core and the fixed core when the surface of the movable core on the fixed core side or the needle and the contact surface contact each other.
  • FIG. 4 is a schematic cross-sectional view showing the fuel injection device according to the first embodiment, and shows a state after the state of FIG. 3.
  • FIG. 4 is a schematic cross-sectional view showing the fuel injection device according to the first embodiment, and shows a state after the state of FIG. 3.
  • FIG. 5 is a schematic cross-sectional view showing the fuel injection device according to the first embodiment, and shows a state after the state of FIG. 4.
  • FIG. 6 is a schematic cross-sectional view showing the fuel injection device according to the first embodiment, and shows a state after the state of FIG. 5.
  • It is a typical sectional view showing the fuel injection device by a 1st embodiment, and is a figure showing the state after the state of Drawing 6.
  • the typical sectional view showing the fuel injection device by a 3rd embodiment It is a typical sectional view showing the fuel injection device by a 3rd embodiment, and is a figure showing the state different from the state of Drawing 10.
  • Typical sectional drawing which shows the fuel-injection apparatus by 4th Embodiment.
  • FIGS. 1 A fuel injection device according to a first embodiment is shown in FIGS.
  • the fuel injection device 1 is used, for example, in a direct injection gasoline engine as an internal combustion engine (not shown), and injects and supplies gasoline as fuel to the engine.
  • the fuel injection device 1 includes a nozzle 10, a housing 20, a needle 30, a first movable core 40 and a second movable core 50 as movable cores, a fixed core 70, a coil 80, and a first biasing member. And a spring 92 as a second urging member.
  • the nozzle 10 is formed in a substantially disc shape by a magnetic material such as ferritic stainless steel.
  • the nozzle 10 has a nozzle hole 11 and a valve seat 12.
  • the nozzle hole 11 is formed so as to penetrate the center of the nozzle 10 in the plate thickness direction.
  • the valve seat 12 is formed in an annular shape around the nozzle hole 11 on one surface of the nozzle 10.
  • the nozzle 10 has a tapered surface on which the valve seat 12 is formed.
  • the housing 20 includes a first cylinder part 21, a second cylinder part 22, and a nonmagnetic member 60.
  • the 1st cylinder part 21 and the 2nd cylinder part 22 are formed in the cylinder shape, for example with magnetic materials, such as ferritic stainless steel.
  • the 1st cylinder part 21 is formed in the substantially cylindrical shape.
  • the 2nd cylinder part 22 is formed in the substantially cylindrical shape.
  • the inner diameter and outer diameter of the second cylindrical portion 22 are larger than the inner diameter and outer diameter of the first cylindrical portion 21.
  • the 1st cylinder part 21 and the 2nd cylinder part 22 are integrally formed so that it may become coaxial.
  • a step surface 201 is formed on the inner wall between the first tube portion 21 and the second tube portion 22.
  • the housing 20 is formed integrally with the nozzle 10 such that the opposite side of the first cylinder portion 21 to the second cylinder portion 22 is connected to the outer edge portion of the surface of the nozzle 10 on the valve seat 12 side. That is, in the present embodiment, the first cylindrical portion 21 and the second cylindrical portion 22 of the housing 20 and the nozzle 10 are integrally formed of the same material.
  • a fuel passage 100 communicating with the injection hole 11 is formed inside the housing 20.
  • the needle 30 is formed in a rod shape from a nonmagnetic material such as austenitic stainless steel.
  • the needle 30 has a needle main body 31 and a collar portion 32.
  • the needle body 31 is formed in a substantially cylindrical shape.
  • One end surface of the needle body 31 is formed in a tapered shape, and a seal portion 33 is formed on the outer edge portion.
  • the needle body 31 is formed with an axial hole 34 and a radial hole 35.
  • the axial hole 34 is formed to extend from the end surface of the needle body 31 opposite to the seal portion 33 toward the seal portion 33 in the axial direction.
  • the radial hole 35 extends in the radial direction of the needle body 31 and is formed to open to the outer wall of the needle body 31.
  • the radial hole portion 35 is connected to the end portion of the axial hole portion 34 on the seal portion 33 side.
  • the collar portion 32 is formed in a substantially cylindrical shape so as to protrude radially outward from the outer wall at the end opposite to the seal portion 33 of the needle body 31.
  • the collar portion 32 is formed integrally with the needle body 31.
  • the end surface of the collar portion 32 opposite to the seal portion 33 is on the same plane as the end surface of the needle body 31 opposite to the seal portion 33.
  • the needle 30 is provided so that it can reciprocate in the axial direction inside the housing 20, and the seal portion 33 can come into contact with the valve seat 12.
  • the needle 30 opens when the seal portion 33 is separated from the valve seat 12 and closes when the seal portion 33 contacts the valve seat 12.
  • the nozzle hole 11 opens and closes.
  • the direction in which the needle 30 is separated from the valve seat 12 is referred to as a valve opening direction
  • the direction in which the needle 30 contacts the valve seat 12 is referred to as a valve closing direction.
  • the fuel injection device 1 includes two movable cores (first movable core 40 and second movable core 50).
  • the first movable core 40 is formed of a magnetic material such as ferritic stainless steel.
  • the first movable core 40 has a cylinder part 41 and a bottom part 42.
  • the cylinder part 41 is formed in a substantially cylindrical shape.
  • the bottom portion 42 is formed in a substantially disc shape, and is formed integrally with the cylinder portion 41 so as to close one end portion of the cylinder portion 41.
  • a recess 43, an insertion hole 44, and a communication hole 45 are formed in the bottom portion 42.
  • the recessed portion 43 is formed so as to be recessed from the center of the surface of the bottom portion 42 opposite to the tubular portion 41 toward the tubular portion 41 side.
  • the insertion hole portion 44 is formed so as to connect the center of the surface 421 of the bottom portion 42 on the cylinder portion 41 side and the center of the recess 43.
  • the communication hole 45 is formed so as to connect the surface 421 of the bottom portion 42 on the cylindrical portion 41 side and the concave portion 43.
  • a plurality of communication holes 45 are formed at equal intervals in the circumferential direction of the bottom 42 on the radially outer side of the insertion hole 44. In the present embodiment, for example, four communication holes 45 are formed.
  • the first movable core 40 is provided such that the needle body 31 is inserted into the insertion hole 44 and is movable relative to the needle body 31 in the axial direction.
  • the outer portion of the insertion hole 44 of the surface 421 on the cylinder portion 41 side of the bottom portion 42 can contact the end surface of the flange portion 32 on the valve seat 12 side.
  • the inner wall of the insertion hole 44 can slide with the outer wall of the needle body 31. That is, the first movable core 40 is provided so as to be movable relative to the needle 30.
  • the outer wall of the cylinder part 41 and the bottom part 42 is slidable with the inner wall of the 2nd cylinder part 22 of the housing 20. As shown in FIG.
  • the second movable core 50 is formed of a magnetic material such as ferritic stainless steel.
  • the second movable core 50 has a movable core body 51.
  • the movable core body 51 is formed in a substantially cylindrical shape.
  • the movable core body 51 is provided such that the inner wall is fitted to the outer wall of the flange portion 32.
  • the movable core body 51 is fixed to the flange portion 32 by, for example, press fitting or welding. That is, the second movable core 50 is provided so as not to move relative to the needle 30. Therefore, the second movable core 50 reciprocates integrally with the needle 30 inside the housing 20.
  • the length of the movable core body 51 in the axial direction is smaller than the length of the flange portion 32 in the axial direction.
  • the end surface of the movable core body 51 opposite to the valve seat 12 is on the same plane as the end surface of the collar portion 32 opposite to the valve seat 12. Therefore, the end surface on the valve seat 12 side of the collar portion 32 is located on the valve seat 12 side with respect to the end surface on the valve seat 12 side of the movable core body 51 of the second movable core 50.
  • a substantially annular gap s1 between the movable cores is formed.
  • the size of the gap s1 between the movable cores in the axial direction varies depending on the position of the first movable core 40 with respect to the needle body 31, and the bottom 42 of the first movable core 40 abuts on the end face of the flange 32 on the valve seat 12 side. The minimum.
  • the bottom portion 42 of the first movable core 40 is in contact with the end surface of the flange portion 32 on the valve seat 12 side, the surface 421 of the bottom portion 42 on the tube portion 41 side and the movable core main body 51.
  • the end face 512 on the valve seat 12 side is always separated from each other, and a movable core gap s1 is formed therebetween.
  • the communication hole 45 of the first movable core 40 communicates with the inter-movable core gap s 1 and connects the inter-movable core gap s 1 and the space inside the recess 43.
  • the axial length of the cylindrical portion 41 of the first movable core 40 is larger than the axial length of the flange portion 32. Therefore, when the bottom portion 42 of the first movable core 40 is in contact with the end surface of the flange portion 32 on the valve seat 12 side, the end surface of the cylinder portion 41 opposite to the valve seat 12 is movable with respect to the second movable core 50.
  • the core body 51 is located on the side opposite to the valve seat 12 with respect to the end surface on the side opposite to the valve seat 12.
  • the outer wall of the movable core body 51 can slide with the inner wall of the cylindrical portion 41 of the first movable core 40.
  • the nonmagnetic member 60 of the housing 20 is formed in a cylindrical shape from a nonmagnetic material such as austenitic stainless steel.
  • the nonmagnetic member 60 forms a magnetic diaphragm portion.
  • the nonmagnetic member 60 is provided on the side opposite to the nozzle 10 with respect to the second cylindrical portion 22.
  • the nonmagnetic member 60 has a nonmagnetic cylindrical portion 61 and a nonmagnetic protruding portion 62.
  • the nonmagnetic cylinder portion 61 is formed in a substantially cylindrical shape.
  • the nonmagnetic projecting portion 62 is formed in a substantially cylindrical shape so as to project radially inward from the inner wall of one end portion of the nonmagnetic tubular portion 61.
  • the nonmagnetic protrusion 62 is formed integrally with the nonmagnetic cylinder 61.
  • the non-magnetic member 60 includes a second cylinder such that an end of the non-magnetic cylinder 61 opposite to the non-magnetic protrusion 62 is connected to an end of the second cylinder 22 opposite to the first cylinder 21. It is provided coaxially with the portion 22.
  • the nonmagnetic member 60 and the second cylindrical portion 22 are connected by welding, for example.
  • the fixed core 70 is provided on the opposite side of the valve seat 12 with respect to the first movable core 40 and the second movable core 50.
  • the fixed core 70 has a fixed core main body 71 and a fixed core outer peripheral portion 72.
  • the fixed core main body 71 and the fixed core outer peripheral portion 72 are formed in a cylindrical shape from a magnetic material such as ferritic stainless steel, for example.
  • the fixed core body 71 is formed in a substantially cylindrical shape.
  • the fixed core outer peripheral portion 72 is formed in a substantially cylindrical shape so as to protrude radially outward from the outer wall of the fixed core main body 71.
  • the fixed core 70 is provided coaxially with the nonmagnetic member 60 so that one end thereof is connected to the end of the nonmagnetic member 60 on the nonmagnetic protrusion 62 side.
  • the fixed core 70 and the nonmagnetic member 60 are connected by welding, for example.
  • the housing 20 has the nonmagnetic member 60 at the end portion on the fixed core 70 side.
  • the end face on the valve seat 12 side of the fixed core outer peripheral portion 72 is located on the opposite side of the valve seat 12 with respect to the end face on the valve seat 12 side of the fixed core main body 71.
  • the end surfaces of the nonmagnetic cylinder portion 61 and the nonmagnetic protrusion 62 on the side opposite to the valve seat 12 are in contact with the end surface of the fixed core outer peripheral portion 72 on the valve seat 12 side.
  • the inner wall of the nonmagnetic protrusion 62 is in contact with the outer wall of the end of the fixed core body 71 on the valve seat 12 side.
  • the end face on the valve seat 12 side of the nonmagnetic protrusion 62 is located on the valve seat 12 side with respect to the end face on the valve seat 12 side of the fixed core body 71.
  • a nonmagnetic contact surface 621 is formed on the end surface of the nonmagnetic protrusion 62 on the valve seat 12 side.
  • the nonmagnetic contact surface 621 is located on the end surface of the first movable core 40 opposite to the bottom 42 of the cylindrical portion 41, that is, on the first movable core end surface 401 that is the end surface of the first movable core 40 on the fixed core 70 side. Abutment is possible.
  • the nonmagnetic contact surface 621 corresponds to a “contact surface”.
  • the end surface of the second movable core 50 opposite to the valve seat 12 of the movable core body 51, that is, the second movable core end surface 501, which is the end surface of the second movable core 50 on the fixed core 70 side, is The end face on the valve seat 12 side, that is, the fixed core end face 701 that is the end face on the first movable core 40 side and the second movable core 50 side of the fixed core 70 can be contacted.
  • An adjusting pipe 90 is provided inside the fixed core body 71.
  • the adjusting pipe 90 is formed in a substantially cylindrical shape with, for example, metal.
  • the adjusting pipe 90 is provided so as not to move relative to the fixed core body 71 so that the outer wall is fitted to the inner wall of the fixed core body 71.
  • the adjusting pipe 90 is provided inside the fixed core main body 71 by, for example, press fitting.
  • the spring 91 is, for example, a coil spring, and is provided between the end surface of the needle 30 opposite to the valve seat 12 and the end surface of the adjusting pipe 90 on the valve seat 12 side.
  • the spring 91 biases the needle 30 toward the valve seat 12 side.
  • the urging force of the spring 91 can be adjusted by adjusting the position of the adjusting pipe 90 with respect to the fixed core body 71.
  • a spring seat 36 is provided on the valve seat 12 side with respect to the collar portion 32 of the needle body 31.
  • the spring seat 36 is formed in a substantially annular shape from a nonmagnetic material such as austenitic stainless steel.
  • the spring seat 36 is provided so that the inner edge portion fits to the outer wall of the needle body 31.
  • the spring seat 36 and the needle body 31 are joined by welding, for example. As a result, the spring seat 36 is not movable relative to the needle body 31.
  • the spring seat 36 is provided on the flange 32 side with respect to the radial hole 35.
  • the spring 92 is a coil spring, for example, and is provided between the recess 43 of the bottom 42 of the first movable core 40 and the spring seat 36. One end of the spring 92 is in contact with the insertion hole 44 of the recess 43 and the communication hole 45, and the other end is in contact with the spring seat 36.
  • the spring 92 biases the first movable core 40 toward the fixed core 70 side.
  • the outer portion of the insertion hole 44 of the surface 421 on the fixed core 70 side of the bottom 42 of the first movable core 40 is pressed against the end face of the flange 32 of the needle 30 on the valve seat 12 side.
  • the urging force of the spring 91 is set larger than the urging force of the spring 92.
  • the coil 80 is formed in a substantially cylindrical shape by winding a winding such as copper.
  • the coil 80 is provided so as to be positioned on the radially outer side of the non-magnetic member 60, the non-magnetic member 60, and the fixed core outer peripheral portion 72 of the second cylindrical portion 22 of the housing 20.
  • a yoke 81 is further provided.
  • the yoke 81 is formed in a cylindrical shape from a magnetic material such as ferritic stainless steel.
  • the yoke 81 is provided so as to cover the outer wall and both ends of the coil 80.
  • One end of the yoke 81 is connected to the outer wall of the second cylindrical portion 22 of the housing 20, and the other end is connected to the outer wall of the fixed core outer peripheral portion 72 of the fixed core 70.
  • the coil 80 generates a magnetic flux when energized.
  • magnetic flux flows through the fixed core 70, the yoke 81, the second cylindrical portion 22, the first movable core 40, and the second movable core 50 so as to avoid the nonmagnetic member 60, thereby forming a magnetic circuit. Is done.
  • the 1st movable core 40 and the 2nd movable core 50 are attracted
  • the first movable core 40 is sucked toward the fixed core 70 in a state where the bottom portion 42 is in contact with the flange portion 32.
  • the needle 30 moves in the valve opening direction and opens.
  • An inlet 101 is formed on the opposite side of the fixed core body 71 from the valve seat 12.
  • the fuel that has flowed into the inside of the fixed core body 71 via the inflow port 101 flows through the inside of the adjusting pipe 90, the axial hole portion 34, the radial hole portion 35, and the inside of the first tube portion 21 of the housing 20. And guided to the nozzle hole 11.
  • the fuel flowing in from the inlet 101 fills the inside of the housing 20, the inside of the nonmagnetic member 60, the inside of the fixed core 70, that is, the fuel passage 100.
  • relatively high-pressure fuel flows from the inlet 101 when the fuel injection device 1 is operated. Therefore, the fuel pressure in the fuel passage 100 is relatively high.
  • the needle 30 is biased toward the valve seat 12 by the biasing force of the spring 91, and the seal portion 33 contacts the valve seat 12 to close the valve. ing. Further, the first movable core 40 is biased toward the fixed core 70 by the biasing force of the spring 92, and the bottom portion 42 is in contact with the flange portion 32 of the needle 30.
  • the distance g1 between the first movable core end surface 401 that is the end surface of the first movable core 40 on the fixed core 70 side and the fixed core end surface 701 that is the end surface of the fixed core 70 on the first movable core 40 side is The distance between the second movable core end surface 501 and the fixed core end surface 701 which is the end surface of the two movable cores 50 on the fixed core 70 side is set smaller.
  • the distance g3 between the first movable core end surface 401 and the nonmagnetic contact surface 621 at this time is equal to the distance g1 minus the distance d1 between the fixed core end surface 701 and the nonmagnetic contact surface 621.
  • the maximum lift amount of the needle 30 is equal to the distance g2.
  • FIG. 1 when the coil 80 is not energized, the needle 30 is closed. As shown in FIG. 2, when the inside of the fuel passage 100 is filled with fuel, the fuel pressure Ff acts on the end surface of the needle 30 opposite to the valve seat 12.
  • the coil 80 When the coil 80 is energized, magnetic flux is generated, and a magnetic circuit is formed in the fixed core 70, the yoke 81, the second cylindrical portion 22, the first movable core 40, and the second movable core 50.
  • the gap between the first movable core 40 and the second movable core 50 is determined.
  • the magnetic resistance is large.
  • the distance g1 between the fixed core end surface 701 and the first movable core end surface 401 is equal to the fixed core end surface 701 and the second core end surface 701.
  • the distance from the movable core end surface 501 is smaller than g2. Therefore, the magnetic flux does not flow so much through the second movable core 50 but flows through the first movable core 40.
  • the suction force between the first movable core 40 and the second movable core 50, particularly the first movable core 40 and the fixed core 70, can be increased. Therefore, when the fuel pressure in the fuel passage 100 is relatively high, the needle 30 can be opened even if the amount of current supplied to the coil 80 is relatively small.
  • the first movable core end surface 401 of the first movable core 40 is brought into nonmagnetic contact. It abuts on the surface 621 (see FIG. 3). Thereby, the movement in the valve opening direction of the 1st movable core 40 is controlled.
  • a substantially annular inter-core gap s2 is formed between the first movable core end surface 401 and the fixed core end surface 701. That is, in a state where the first movable core 40 is in contact with the nonmagnetic contact surface 621, the first movable core end surface 401 and the fixed core end surface 701 are separated from each other.
  • the distance between the fixed core end surface 701 and the second movable core end surface 501 is smaller than the initial energization of the coil 80 (see FIG. 2). Therefore, a large amount of magnetic flux also flows through the second movable core 50, and the attractive force between the fixed core 70 and the second movable core 50 increases.
  • the fuel pressure Ff acts on the outer edge portion of the end surface of the needle body 31 on the valve seat 12 side, that is, the seal portion 33. Therefore, the fuel pressure Ff is applied to both ends of the needle 30.
  • the needle 30 opens in the valve opening direction even if the amount of current supplied to the coil 80 is relatively small. Can be moved further.
  • the second movable core end surface 501 of the second movable core 50 comes into contact with the fixed core end surface 701 (FIG. 4). reference).
  • the 2nd movable core 50 and the needle 30 are controlled to move in the valve opening direction.
  • the lift amount of the needle 30 is maximized.
  • the second movable core 50 When the state shown in FIG. 3 is shifted to the state shown in FIG. 4, the second movable core 50 has the end surface 512 on the valve seat 12 side of the movable core body 51, and the fixed core of the bottom portion 42 of the first movable core 40. It moves in the valve opening direction, which is the direction away from the 70-side surface 421.
  • the gap s1 between the movable cores is formed between the surface 421 on the fixed core 70 side of the bottom 42 of the first movable core 40 and the entire end surface 512 on the valve seat 12 side of the movable core body 51 of the second movable core 50.
  • the ringing force generated between the end surface 512 of the movable core body 51 on the valve seat 12 side and the surface 421 of the bottom 42 on the fixed core 70 side can be reduced.
  • the communication hole 45 communicates with the movable core gap s1, at this time, part of the fuel in the communication hole 45 flows into the movable core gap s1. Therefore, the second movable core 50 is easy to move in the valve opening direction that is the direction away from the first movable core 40. Therefore, the needle 30 can be quickly moved in the valve opening direction.
  • the second movable core 50 When the state shown in FIG. 4 is shifted to the state shown in FIG. 5, the second movable core 50 has the end surface 512 on the valve seat 12 side of the movable core body 51, and the fixed core of the bottom portion 42 of the first movable core 40. It moves in the valve closing direction so as to approach the surface 421 on the 70 side.
  • the communication hole 45 since the communication hole 45 communicates with the movable core gap s 1, at this time, part of the fuel in the movable core gap s 1 flows into the communication hole 45. Therefore, the second movable core 50 and the needle 30 are easy to move in the valve closing direction. Therefore, the needle 30 can be quickly moved in the valve closing direction.
  • the needle 30 When the needle 30 further moves in the valve closing direction with the collar portion 32 in contact with the first movable core 40, the first movable core end surface 401 is separated from the nonmagnetic contact surface 621, and the seal portion 33 is moved to the valve seat 12. The needle 30 closes (see FIG. 6). Thereby, the fuel injection from the nozzle hole 11 is stopped.
  • the first movable core 40 moves in the valve closing direction in which the first movable core end surface 401 is away from the fixed core end surface 701.
  • the inter-core gap s2 is formed between the first movable core end surface 401 and the fixed core end surface 701 in a state where the first movable core end surface 401 is in contact with the nonmagnetic contact surface 621.
  • the first movable core 40 is easy to move in the valve closing direction, which is the direction away from the fixed core 70. Therefore, the needle 30 can be quickly moved in the valve closing direction.
  • the first movable core 40 After the state shown in FIG. 6, the first movable core 40 further moves in the valve closing direction due to inertia (see FIG. 7).
  • the first movable core 40 has a surface 421 on the fixed core 70 side of the bottom 42, and the valve core 12 side of the movable core body 51 of the second movable core 50. It moves in the valve closing direction, which is the direction away from the end face 512 of the valve.
  • the gap s1 between the movable cores is formed between the surface 421 on the fixed core 70 side of the bottom 42 of the first movable core 40 and the entire end surface 512 on the valve seat 12 side of the movable core body 51 of the second movable core 50.
  • the ringing force generated between the end surface 512 of the movable core body 51 on the valve seat 12 side and the surface 421 of the bottom 42 on the fixed core 70 side can be reduced.
  • the communication hole 45 since the communication hole 45 communicates with the movable core gap s1, at this time, part of the fuel in the communication hole 45 flows into the movable core gap s1.
  • the first movable core 40 easily moves in the valve closing direction, which is the direction away from the second movable core 50. Therefore, the collision energy when the seal portion 33 of the needle 30 contacts the valve seat 12 (see FIG. 6) can be reduced. Therefore, it is possible to suppress the needle 30 from bouncing at the valve seat 12 and to suppress an unintended secondary valve opening.
  • the first movable core 40 moves in the valve opening direction by the biasing force of the spring 92.
  • the surface 421 of the bottom 42 on the fixed core 70 side comes into contact with the end surface of the flange 32 on the valve seat 12 side, and movement in the valve opening direction is restricted (see FIG. 1).
  • the fuel injection device 1 repeats the states shown in FIGS. 1 to 7 when continuing to inject fuel into the engine.
  • the fuel injection device 1 includes the nozzle 10, the housing 20, the needle 30, the first movable core 40, the second movable core 50, the fixed core 70, and the coil 80.
  • the nozzle 10 has a nozzle hole 11 through which fuel is injected, and a valve seat 12 formed around the nozzle hole 11.
  • the housing 20 is formed in a cylindrical shape, has one end connected to the nozzle 10, and has a fuel passage 100 that is formed inside so as to communicate with the injection hole 11 and guides fuel to the injection hole 11.
  • the needle 30 is provided so as to be capable of reciprocating inside the housing 20, and opens when one end is separated from the valve seat 12, and closes when one end contacts the valve seat 12.
  • the first movable core 40 is provided to be movable relative to the needle 30.
  • the second movable core 50 is provided so as not to move relative to the needle 30.
  • the fixed core 70 is provided on the opposite side of the valve seat 12 with respect to the first movable core 40 and the second movable core 50.
  • the coil 80 generates magnetic flux when energized, and can attract the first movable core 40 and the second movable core 50 toward the fixed core 70 and move the needle 30 to the side opposite to the valve seat 12.
  • the surface 421 on the fixed core 70 side of the bottom 42 of the first movable core 40 and the movable core body 51 of the second movable core 50 is formed between the end face 512 on the valve seat 12 side. Therefore, the magnetic resistance between the first movable core 40 and the second movable core 50 can be increased. Thereby, when the coil 80 is energized, a large amount of magnetic flux can flow through the first movable core 40 of the first movable core 40 and the second movable core 50, and the first movable core 40 and the fixed core 70 The suction force between the two can be increased. Therefore, even when the fuel pressure in the fuel passage 100 is high, the needle 30 can be opened. Therefore, in this embodiment, high-pressure fuel can be injected.
  • the annular movable core gap s1 is formed between the first movable core 40 and the second movable core 50, the first movable core 40 and the second movable core 50 are separated from each other.
  • the ringing force generated when trying to do so can be reduced. Therefore, it is possible to suppress a decrease in the valve opening speed of the needle and an unintended secondary valve opening that may occur in the conventional fuel injection device. Therefore, in this embodiment, fuel can be injected with high accuracy.
  • the nonmagnetic member 60 of the housing 20 is the first movable core 40 and the first movable core 50, which is the surface of the first movable core 40 on the fixed core 70 side.
  • a nonmagnetic contact surface 621 that can contact the core end surface 401 is provided.
  • an annular inter-core gap s ⁇ b> 2 is formed between the first movable core 40 and the fixed core 70. Therefore, when energization of the coil 80 is stopped and the needle 30 is closed, the residual magnetism of the fixed core 70 affects the first movable core 40 or between the fixed core 70 and the first movable core 40.
  • the housing 20 has a nonmagnetic member 60 formed of a nonmagnetic material at the end on the fixed core 70 side.
  • the nonmagnetic contact surface 621 is formed on the end surface of the nonmagnetic member 60 on the valve seat 12 side. Therefore, when the energization to the coil 80 is stopped while the first movable core end surface 401 is in contact with the nonmagnetic contact surface 621, the first movable core 40 is quickly separated from the nonmagnetic contact surface 621. Thereby, the responsiveness of the fuel injection device 1 can be improved.
  • the first movable core 40 has a communication hole 45 communicating with the gap s1 between the movable cores. Therefore, the fuel can be moved back and forth between the movable core gap s 1 and the communication hole 45. Accordingly, when the needle 30 is opened and closed, the first movable core 40 and the second movable core 50 can be quickly separated from each other, or the collision energy when the needle 30 comes into contact with another member can be reduced. . Therefore, the fuel can be injected with high accuracy.
  • the needle 30 has a rod-shaped needle body 31 and a flange 32 provided on the radially outer side of the needle body 31.
  • a gap s1 between the movable cores is formed between the first movable core 40 and the second movable core 50.
  • the first movable core end surface 401 which is the end surface of the first movable core 40 on the fixed core 70 side, the first movable core 40 of the fixed core 70, and
  • the distance from the fixed core end surface 701 that is the end surface on the second movable core 50 side is set to be smaller than the distance between the second movable core end surface 501 that is the end surface on the fixed core 70 side of the second movable core 50 and the fixed core end surface 701.
  • the present embodiment further includes a spring 91 and a spring 92.
  • the spring 91 biases the needle 30 toward the valve seat 12 side.
  • the spring 92 biases the first movable core 40 of the first movable core 40 and the second movable core 50 toward the fixed core 70. This exemplifies a specific configuration of the present disclosure.
  • FIGS. A fuel injection device according to the second embodiment is shown in FIGS.
  • the second embodiment is different from the first embodiment in the configuration of the nonmagnetic member 60 and the fixed core 70.
  • the nonmagnetic member 60 does not have the nonmagnetic protrusion 62 shown in the first embodiment, and consists only of the nonmagnetic cylinder 61.
  • the inner wall of the end portion of the nonmagnetic cylinder portion 61 opposite to the valve seat 12 is in contact with the outer wall of the end portion of the fixed core body 71 on the valve seat 12 side.
  • the fixed core 70 further has a fixed core protrusion 73.
  • the fixed core protrusion 73 is formed so as to protrude from the outer edge of the fixed core end surface 701 to the valve seat 12 side in a substantially annular shape.
  • a fixed core contact surface 731 is formed on the end surface of the fixed core protrusion 73 on the valve seat 12 side.
  • the fixed core contact surface 731 can contact the first movable core end surface 401 of the first movable core 40 (see FIG. 9).
  • the fixed core contact surface 731 corresponds to a “contact surface”.
  • the protruding height of the fixed core protrusion 73 from the fixed core end surface 701, that is, the distance d1 between the fixed core end surface 701 and the fixed core abutting surface 731 is different from the fixed core end surface 701 shown in the first embodiment.
  • the distance d1 is the same as the distance d1 from the magnetic contact surface 621.
  • the fixed core protrusion 73 of the fixed core 70 is located on the fixed core 70 side of the first movable core 40 of the first movable core 40 and the second movable core 50. It has a fixed core contact surface 731 that can contact the first movable core end surface 401 that is a surface. When the first movable core end surface 401 and the fixed core contact surface 731 come into contact with each other, an annular inter-core gap s ⁇ b> 2 is formed between the first movable core 40 and the fixed core 70.
  • the influence of the residual magnetism of the fixed core 70 affects the first movable core 40 or the fixed core 70 and the first core.
  • Generation of ringing force between the movable core 40 and the movable core 40 can be suppressed. Thereby, it can suppress that the 1st movable core 40 will be in the state which contact
  • FIG. Therefore, the needle 30 can be quickly closed after energization of the coil 80 is stopped. Therefore, in this embodiment, fuel can be injected with high accuracy.
  • the fixed core 70 is formed with a fixed core abutting surface 731 which is a surface capable of abutting on the first movable core end surface 401 which is an end surface of the first movable core 40 on the fixed core 70 side. .
  • the fixed core 70 includes a cylindrical fixed core main body 71 and a fixed core end surface 701 that is an end surface of the fixed core main body 71 on the first movable core 40 side and the second movable core 50 side.
  • the fixed core protrusion 73 protrudes from the first movable core 40 to the first movable core 40 side.
  • the fixed core contact surface 731 is formed on the end surface of the fixed core protrusion 73 on the first movable core 40 side. This exemplifies a specific configuration of the present disclosure.
  • FIGS. 1 A fuel injection device according to a third embodiment is shown in FIGS.
  • the third embodiment differs from the first embodiment in the configuration of the fixed core 70.
  • the fixed core 70 further includes a bush 74.
  • the bush 74 is formed in a substantially cylindrical shape by a nonmagnetic material such as austenitic stainless steel.
  • the bush 74 is provided inside the end of the fixed core body 71 on the valve seat 12 side.
  • the outer wall of the bush 74 is fitted to the inner wall of the fixed core body 71.
  • the bush 74 is fixed to the fixed core body 71 by welding, for example.
  • the end surface of the bush 74 on the valve seat 12 side is located on the valve seat 12 side with respect to the fixed core end surface 701.
  • a fixed core contact surface 741 is formed on the end surface of the bush 74 on the valve seat 12 side.
  • the fixed core abutting surface 741 can abut on the second movable core end surface 501 of the second movable core 50 and the end surface of the flange portion 32 opposite to the valve seat 12 (see FIG. 11).
  • the fixed core contact surface 741 corresponds to a “contact surface”.
  • the distance d2 between the fixed core contact surface 741 and the fixed core end surface 701 is smaller than the distance d1 between the nonmagnetic contact surface 621 and the fixed core end surface 701.
  • the bush 74 of the fixed core 70 is the surface of the first movable core 40 and the second movable core 50 on the fixed core 70 side of the second movable core 50.
  • the second movable core end surface 501 and the fixed core contact surface 741 that can contact the surface of the needle 30 on the fixed core 70 side are provided.
  • an annular inter-core gap s 3 is formed between the second movable core 50 and the fixed core 70.
  • the residual magnetism of the fixed core 70 affects the second movable core 50 or between the fixed core 70 and the second movable core 50. It is possible to suppress the occurrence of ringing force. Thereby, it can suppress that the 2nd movable core 50 will be in the state which contact
  • the fixed core 70 is a surface that can abut on the second movable core end surface 501 that is the end surface of the second movable core 50 on the fixed core 70 side and the end surface of the needle 30 opposite to the valve seat 12.
  • a fixed core contact surface 741 is formed.
  • the fixed core 70 has a cylindrical fixed core main body 71 and a cylindrical bush 74 provided inside the fixed core main body 71.
  • the fixed core contact surface 741 is formed on the end surface of the bush 74 on the second movable core 50 side. This exemplifies a specific configuration of the present disclosure.
  • FIG. 12 shows a fuel injection device according to the fourth embodiment.
  • the fourth embodiment differs from the first embodiment in the configuration of the needle 30 and the second movable core 50.
  • the needle 30 does not have the collar part 32 shown in 1st Embodiment.
  • the second movable core 50 has a movable core body 51 and a movable core protrusion 52.
  • the movable core body 51 is provided so that the inner wall is fitted to the outer wall of the end portion of the needle body 31 opposite to the seal portion 33.
  • the movable core body 51 is fixed to the needle body 31 by, for example, press fitting or welding. That is, the second movable core 50 is provided so as not to move relative to the needle 30.
  • the movable core projecting portion 52 is formed so as to project in a substantially annular shape from the inner edge portion of the end surface 512 of the movable core body 51 on the valve seat 12 side to the valve seat 12 side. Therefore, the end surface on the valve seat 12 side of the movable core projecting portion 52 is located on the valve seat 12 side with respect to the end surface 512 on the valve seat 12 side of the movable core body 51 of the second movable core 50. Between the surface 421 of the bottom 42 of the first movable core 40 on the fixed core 70 side and the end surface 512 of the movable core body 51 of the second movable core 50 on the valve seat 12 side, there is a substantially annular gap s1 between the movable cores. Is formed.
  • the axial size of the gap s1 between the movable cores varies depending on the position of the first movable core 40 with respect to the needle body 31, and the bottom 42 of the first movable core 40 is located on the end face of the movable core protrusion 52 on the valve seat 12 side. When abutting, it is minimum.
  • the surface 421 on the fixed core 70 side of the bottom 42 and the movable core main body. 51 is always separated from the end surface 512 on the valve seat 12 side, and a gap s1 between the movable cores is formed therebetween.
  • the configuration of the fourth embodiment is the same as that of the first embodiment except for the points described above.
  • the movable core is between the second movable core 50 and the movable core.
  • a gap s1 is formed.
  • the shape of the needle 30 can be simplified. Therefore, the processing cost of the needle 30 can be reduced.
  • the volume of the second movable core 50 can be increased by the amount that the needle 30 does not have the flange portion 32. Therefore, the suction force between the fixed core 70 and the second movable core 50 can be increased.
  • the second movable core 50 includes the movable core main body 51 and the movable core protruding portion 52 that protrudes from the end face 512 of the movable core main body 51 on the valve seat 12 side to the valve seat 12 side.
  • a movable inter-core gap s1 is formed between the first movable core 40 and the end surface 512 of the movable core body 51 on the valve seat 12 side.
  • the surface 421 on the fixed core 70 side of the bottom 42 of the first movable core 40 and the end surface 512 on the valve seat 12 side of the movable core body 51 of the second movable core 50 may be in contact with each other.
  • the gap s1 between the movable cores. Is not formed.
  • the example in which the movable inter-core gap s1, the inter-core gap s2, and the inter-core gap s3 are formed is shown.
  • at least one of the movable inter-core gap s1, the inter-core gap s2, and the inter-core gap s3 may be formed.
  • the bush 74 may be configured to contact only the surface of the needle 30 on the fixed core 70 side without contacting the second movable core 50. In the case of this configuration, wear of the second movable core 50 due to contact with the bush 74 can be prevented.
  • the configuration in which the outer wall of the movable core body 51 of the second movable core 50 is slidable with the inner wall of the cylindrical portion 41 of the first movable core 40 is exemplified.
  • the inner diameter of the insertion hole 44 of the bottom 42 of the first movable core 40 is set slightly larger than the outer diameter of the needle body 31, and the outer diameter of the movable core body 51 is set to be a cylinder.
  • a cylindrical clearance may always be formed between the outer wall of the movable core body 51 and the inner wall of the cylindrical portion 41.
  • the magnetic resistance between the first movable core 40 and the second movable core 50 can be increased, and the attractive force between the first movable core 40 and the fixed core 70 can be increased.
  • the cylindrical clearance is always in communication with the movable core gap s1
  • fuel can be transferred between the movable core gap s1 and the cylindrical clearance. Accordingly, when the needle 30 is opened and closed, the first movable core 40 and the second movable core 50 can be quickly separated from each other, or the collision energy when the needle 30 comes into contact with another member can be reduced. . Therefore, the fuel can be injected with high accuracy.
  • the communication hole 45 may be omitted. In the modification of the above embodiment, the communication hole 45 may be formed in the second movable core 50.
  • the distance g1 between the first movable core end surface 401 of the first movable core 40 and the fixed core end surface 701 of the fixed core 70 is The example in which the distance between the second movable core end surface 501 and the fixed core end surface 701 of the two movable cores 50 is set smaller than the distance g2 is shown.
  • the distance g1 may be set to the distance g2 or more.
  • the example in which the spring 92 as the second urging member is provided between the first movable core 40 and the spring seat 36 has been described.
  • the spring seat 36 is omitted, and the spring 92 has one end in contact with the first movable core 40 and the other end in contact with the stepped surface 201 of the housing 20.
  • the core 40 may be provided to be urged in the valve opening direction.
  • the example in which the bush 74 is formed separately from the fixed core main body 71 is shown.
  • the bush 74 may be formed integrally with the fixed core body 71.
  • the distance d2 between the fixed core contact surface 741 that is the end surface of the bush 74 on the valve seat 12 side and the fixed core end surface 701 that is the end surface of the fixed core body 71 on the valve seat 12 side is any size. May be.
  • the distance d2 is the nonmagnetic contact surface 621 or fixed.
  • the housing 20 is replaced with the nonmagnetic member 60, and has a magnetic aperture part which is formed in a cylindrical shape from a magnetic material and has a partly axial thickness smaller than that of other parts. It is good.
  • a contact surface that can be in contact with the first movable core end surface 401 may be formed in the magnetic aperture portion, similar to the nonmagnetic contact surface 621.
  • the two movable cores of the first movable core 40 and the second movable core 50 are provided.
  • the modification of the said embodiment may be provided with three or more movable cores.
  • the movable core main body 51 of the second movable core 50 is divided into two in the axial direction, the divided body on the fixed core 70 side is provided so as not to move relative to the needle 30, and the divided body on the valve seat 12 side is provided with the needle 30.
  • it is provided so as to be relatively movable.
  • the nozzle 10 may be formed separately from the housing 20.
  • the nozzle 10 is formed of the same material as that of the needle 30, wear of the valve seat 12 of the nozzle 10 associated with the opening / closing valve of the needle 30 can be suppressed.
  • the fixed core outer peripheral portion 72 is formed integrally with the fixed core main body 71 is shown.
  • the fixed core outer peripheral portion 72 may be formed separately from the fixed core main body 71.
  • the cylindrical flange 32, the nonmagnetic protrusion 62, and the bush 74 may be formed in a shape with a part of the circumferential direction missing.
  • annular fixed core protrusion part 73 and the movable core protrusion part 52 may be formed in the shape where a part of circumferential direction lacked.
  • the housing 20, the 1st movable core 40, the 2nd movable core 50, the fixed core 70, and the yoke 81 may be formed not only with ferritic stainless steel but with another magnetic material.
  • the needle 30, the nonmagnetic member 60, the spring seat 36, and the bush 74 are not limited to austenitic stainless steel, and may be formed of other nonmagnetic materials.
  • the needle 30 may be made of martensitic stainless steel, for example.
  • the present disclosure is not limited to injecting high-pressure fuel, and may be used to inject low-pressure fuel.
  • the present disclosure is not limited to a direct injection type gasoline engine, and may be applied to, for example, a port injection type gasoline engine or a diesel engine.
  • the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
PCT/JP2017/008691 2016-03-10 2017-03-06 燃料噴射装置 WO2017154815A1 (ja)

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WO2014017227A1 (ja) * 2012-07-27 2014-01-30 日立オートモティブシステムズ株式会社 電磁式燃料噴射弁

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019065414A1 (ja) * 2017-09-29 2019-04-04 株式会社デンソー 燃料噴射弁
JP2019065852A (ja) * 2017-09-29 2019-04-25 株式会社デンソー 燃料噴射弁

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