WO2014141757A1 - 電磁式燃料噴射弁 - Google Patents
電磁式燃料噴射弁 Download PDFInfo
- Publication number
- WO2014141757A1 WO2014141757A1 PCT/JP2014/051616 JP2014051616W WO2014141757A1 WO 2014141757 A1 WO2014141757 A1 WO 2014141757A1 JP 2014051616 W JP2014051616 W JP 2014051616W WO 2014141757 A1 WO2014141757 A1 WO 2014141757A1
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- WIPO (PCT)
- Prior art keywords
- peripheral side
- core
- iron core
- outer peripheral
- side fixed
- Prior art date
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Classifications
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- 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
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- 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
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- 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
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- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
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- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
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- 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
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- 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
- F02M61/042—The valves being provided with fuel passages
Definitions
- the present invention relates to a fuel injection valve for supplying fuel to an internal combustion engine, and more particularly to a fuel injection valve driven by electromagnetic force.
- Patent Document 1 JP-A-2005-307750 (Patent Document 1) as background art in this technical field.
- This publication describes an electromagnetic fuel injection valve including a coil, a fixed core, a movable core, a fuel pipe, and a spring as an electromagnetic drive unit.
- the fuel pipe has a large-diameter cylindrical portion and a small-diameter cylindrical portion, and the small-diameter cylindrical portion is provided at the lower end of the large-diameter cylindrical portion.
- a fixed core is mounted on the outer periphery of the small diameter cylindrical portion, and a wound coil is mounted in the fixed core.
- the fixed core has an inner peripheral side core part and an outer peripheral side core part, the inner peripheral side core part constitutes an inner peripheral side magnetic path, and the outer peripheral side core part constitutes an outer peripheral side magnetic path.
- the end surface of the inner peripheral side magnetic passage and the end surface of the outer peripheral side magnetic passage are opposed to the end surface of the movable core.
- a magnetic flux generated by energizing the coil flows between the end face of the inner peripheral magnetic path and the end face of the outer magnetic path and the end face of the movable core, and an electromagnetic force (attraction force) corresponding to the magnetic flux density acts.
- the lower end portion of the small-diameter cylindrical portion of the fuel pipe extends from the inner peripheral side magnetic passage end surface and the outer peripheral side magnetic passage end surface to the nozzle needle side.
- a cover is provided in which the ends of both shafts are laser welded to the outer periphery of the lower end portion of the small diameter cylindrical portion and the outer periphery of the large diameter cylindrical portion of the fuel pipe.
- a fixed core and a coil are accommodated in an internal space defined by the cover and the fuel pipe to prevent fuel from entering the fixed core and the coil (paragraph 0040).
- the position where the cover is laser welded to the outer periphery of the lower end of the small-diameter cylindrical portion and the outer periphery of the large-diameter cylindrical portion is movable in the fixed core in consideration of deterioration of the magnetic properties of the fixed core due to the melting heat of welding.
- the cover is joined to a part other than the end face on the core side, specifically, a part relatively far from the end face on the movable core side in the fixed core, or another member (paragraph 0050).
- Patent Document 1 describes an electromagnetic fuel injection valve in which a cover made of a nonmagnetic material that covers only a coil portion is provided between an end surface of an inner peripheral magnetic passage and an end surface of an outer peripheral magnetic passage. Yes. This cover prevents the fuel from entering the coil.
- the cover is made thin, and may be a magnetic material cover. Further, when the magnetic material cover is used, a bridging portion between the end surface of the inner peripheral magnetic passage and the end surface of the outer peripheral magnetic passage is used. Is made thinner than other parts (paragraphs 0087-0089, FIG. 11, FIG. 12, FIG. 13).
- Patent Document 1 discloses a cover that covers the end surface of the inner peripheral magnetic path and the coil portion between the end surfaces of the outer peripheral magnetic path and both end surfaces, or the end surface of the inner peripheral magnetic path and the end surface of the outer magnetic path.
- the cover which covers only the coil part in between is described.
- the portion covering the coil is made of a nonmagnetic material
- the cover is made of a nonmagnetic material.
- Patent Document 1 Although consideration is given to the deterioration of the magnetic properties of the fixed core due to the fusion heat of welding, there is no consideration for deformation including distortion of the fixed core or cover due to the heat of fusion.
- the fixed core and the movable core will be described below as a fixed core and a movable core. Accordingly, the inner peripheral core portion and the outer peripheral core portion are referred to as an inner peripheral fixed core portion and an outer peripheral fixed core portion.
- an electromagnetic fuel injection valve has a nonmagnetic portion made of a metal material between both end surfaces, with both end surfaces of the inner peripheral side core portion and the outer peripheral side core portion facing the movable core.
- energy is applied to the target member to be heat-treated from a surface different from the surface facing the movable core to generate heat in the target member. More preferably, energy is applied from a surface different from the surface facing the movable iron core.
- the electromagnetic fuel injection valve having a structure in which both end surfaces of the inner peripheral side core portion and the outer peripheral side core portion are opposed to the movable core and have a nonmagnetic portion made of a metal material between the both end surfaces. It is possible to make the structure in which the influence of the heat treatment hardly appears on the surface of the target member that is to be opposed to the movable iron core.
- FIG. 3 is an enlarged longitudinal sectional view showing the vicinity of magnetic poles 401a-1 and 401b-3 indicated by broken lines in FIG. 2 is a longitudinal sectional view showing a configuration of an assembly of a fixed iron core 401.
- FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 for members constituting the nonmagnetic portion 401d.
- FIG. 4 is an enlarged longitudinal sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 indicated by a broken line circle A in FIG. 2 for an example of changing the shape of a member constituting the nonmagnetic portion 401d.
- FIG. 4 is an enlarged longitudinal sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 shown by a broken line circle A in FIG. 2 for a further modification of the shape of the member constituting the nonmagnetic portion 401d.
- FIG. 4 is an enlarged longitudinal sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 shown by a broken line circle A in FIG. 2 for a further modification of the shape of the member constituting the nonmagnetic portion 401d.
- FIG. 4 is an enlarged longitudinal sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 shown by a broken line circle A in FIG. 2 for a further modification of the shape of the member constituting the nonmagnetic portion
- FIG. 4 is an enlarged longitudinal sectional view showing the vicinity of magnetic poles 401a-1 and 401b-3 indicated by a broken line circle A in FIG.
- FIG. 5 is an enlarged longitudinal sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 indicated by a broken line circle A in FIG. 2 for a modification of the second embodiment of the present invention.
- FIG. 6 is a longitudinal sectional view showing, in an enlarged manner, the vicinity of magnetic poles 401a-1 and 401b-3 indicated by a broken line circle A in FIG. 2 for a further modification of the second embodiment of the present invention.
- FIG. 1 is a longitudinal sectional view showing the structure of an electromagnetic fuel injection valve according to an embodiment of the present invention.
- the electromagnetic fuel injection valve 1 is composed of a fuel supply unit 2 that supplies fuel, a valve unit 3 that allows or blocks fuel flow, and an electromagnetic drive unit 4 that drives the valve unit 3.
- a fuel supply unit 2 that supplies fuel
- a valve unit 3 that allows or blocks fuel flow
- an electromagnetic drive unit 4 that drives the valve unit 3.
- an electromagnetic fuel injection valve for an internal combustion engine using gasoline as fuel will be described as an example.
- the fuel supply unit 2, the electromagnetic drive unit 4, and the valve unit 3 are arranged in this order along the direction of the central axis 1a.
- the fuel supply part 2 side is attached to a fuel pipe side (not shown), and the valve part 3 side is attached so as to face an intake pipe or a cylinder (not shown).
- the fuel of the electromagnetic fuel injection valve 1 flows from the fuel supply unit 2 to the valve unit 3 substantially along the central axis direction of the electromagnetic fuel injection valve 1.
- the fuel passage in the electromagnetic fuel injection valve 1 is configured substantially along the direction of the central axis 1 a of the electromagnetic fuel injection valve 1.
- a fuel passage 106 is constituted by a through hole 105 penetrating in the center axis direction at the center of the fuel pipe 201 and the inner peripheral side fixed iron core 401a.
- a through hole 402a-5 serving as a fuel passage is formed in a portion of the first movable iron core 402a facing the opening of the through hole 150.
- a concave portion 101a-2 serving as a fuel passage, an inner peripheral side of the concave portion 101a-2, and an outer peripheral side of the enlarged diameter portion 101a.
- a communication hole 101a-3 that constitutes a fuel passage.
- a through hole 402b-8 serving as a fuel passage is provided on the bottom surface of the recess of the second movable iron core 402b that accommodates the first movable iron core 402a.
- the fuel flows in the order of the fuel passage 106 of the fuel pipe 201, the through hole 402a-5, the recess 101a-2, the communication hole 101a-3, and the through hole 402b-8, and then flows into the fuel passage 106 in the nozzle body 111. .
- the fuel supply unit 2 is constituted by a fuel pipe 201 extending from one end of an inner peripheral side fixed iron core 401a constituting an electromagnetic drive unit 4 to be described later.
- a fuel supply port 201a is opened at the end of the fuel pipe 201. is doing.
- an enlarged diameter portion 201b that expands in diameter and constitutes a stepped portion.
- An O-ring 202 is attached between the enlarged diameter portion 201b and the fuel supply port 201a.
- backup rings 203a and 203b are stacked between the O-ring 202 and the enlarged diameter portion 201b.
- the O-ring 202 functions as a seal that prevents fuel leakage when the fuel supply port 201a is attached to the fuel pipe.
- the backup rings 203a and 203b are for backing up the O-ring 202.
- a filter 204 that filters out foreign matters mixed in the fuel is disposed inside the fuel supply port 201a.
- the valve unit 3 includes an injection hole forming member 301 in which a fuel injection hole 301a and a valve seat 301b are formed, a guide member 302 disposed inside the injection hole forming member 301, and one end (front end side) of the plunger rod 101. And a valve body 303 provided at the top.
- the injection hole forming member 301 is fitted on the inner peripheral surface 111 a of the recess formed at the tip of the nozzle body 111.
- One end of the plunger rod 101 is guided by the guide member 302 to move the electromagnetic fuel injection valve 1 in the direction of the central axis 1a (opening / closing valve direction).
- the valve body 303 contacts the valve seat 301b when the valve is closed, and seals the fuel in cooperation with the valve seat 301b.
- a fuel passage 302a is formed in the guide member 302 between the valve body 303 and the valve seat 301b.
- the fuel passage 302a is configured to seal the fuel when the valve is closed and send the fuel to a fuel passage portion through which the fuel flows when the valve is opened.
- the valve part 3 is a main part that injects fuel spray and constitutes a spray forming part that forms spray.
- the electromagnetic drive unit 4 includes a fixed iron core 401, a movable iron core 402, and a coil 403 that constitute an electromagnet that generates electromagnetic force, a first spring member (spring) 404 that urges the movable iron core 402 in the valve closing direction, a spring And a spring force adjusting member 405 that adjusts the spring force of the member 404.
- the valve body 303 is driven by the electromagnetic drive unit 4 and operates as an opening / closing valve by moving away from the valve seat 301 or contacting the valve seat 301.
- the movable iron core 402 is composed of a first movable iron core 402a and a second movable iron core 402b, and a second iron that biases the movable iron core 402 in the valve opening direction.
- a spring member (spring) 406 is provided.
- the nozzle body 111 is also a housing member from the portion where the movable iron core 402 is accommodated in the electromagnetic drive unit 401 to the valve unit 3.
- FIG. 2 is an enlarged longitudinal sectional view showing the structure of the electromagnetic drive unit 4.
- FIG. 2 shows a state in which the coil is closed with the power supply cut off.
- the stator core 401 has an inner peripheral side fixed iron core 401a provided on the inner peripheral side, an outer peripheral side fixed iron core 401b provided on the outer peripheral side, and an inner peripheral side fixed iron core 401a across the coil 403 wound around the bobbin 407. And an upper fixed core 401c that connects the inner peripheral fixed core 401a and the outer peripheral fixed core 401b at each end of the outer peripheral fixed core 401b.
- the outer peripheral side fixed iron core 401b is an outer peripheral yoke part (first yoke part)
- the inner peripheral side fixed iron core 401a is an inner peripheral side yoke part (second yoke part)
- the upper fixed iron core 401c is an upper yoke. Part (third yoke part).
- An inner peripheral side magnetic pole is formed on the end surface 401a-1 of the inner peripheral side fixed iron core 401a facing the movable core 402, and an inner peripheral magnetic path is formed from the end surface 401a-1 toward the other end.
- the outer peripheral side fixed iron core 401b is composed of a first outer peripheral side fixed iron core part 401b-1 facing the movable iron core part 402 and a second outer peripheral side fixed iron core part 401b-2 covering the outer peripheral side of the coil 403. .
- An outer peripheral side magnetic pole is formed on the end surface 401b-3 of the outer peripheral side fixed iron core 401b facing the movable core 402, and an outer peripheral side magnetic path is formed from the end surface 401b-3 toward the other end side.
- the upper fixed iron core 401c constitutes an upper (bridged) magnetic path.
- the non-magnetic portion 401d has no end through which the end surface 401a-1 of the inner peripheral side fixed core 401a is formed and the end surface 401b-3 of the outer peripheral side fixed core 401b formed without going through the mover 402. are provided in order to reduce the magnetic flux (leakage magnetic flux) that flows by short-circuiting between the two.
- the inner peripheral side fixed iron core 401a and the outer peripheral side fixed iron core 401b are made of a magnetic metal material
- the nonmagnetic portion 401d is made of a member made of a nonmagnetic metal material.
- the movable core portion 402 includes a first movable iron core 402a and a second movable iron core 402b.
- the upper end surface (end surface facing the fixed core 401) 402b-2 of the second movable iron core 402b is formed with a recess 402b-1 that is recessed toward the other end surface (lower surface).
- the first movable iron core 402a is accommodated inside the recess 402b-1.
- the outer peripheral portion of the upper end surface 402a-2 is opposed to the end surface 401a-1 of the inner peripheral fixed iron core 401a, and the first spring member is disposed on the center side (inner peripheral side) portion.
- the lower end of 404 abuts. That is, a magnetic path through which the magnetic flux passes is formed on the outer peripheral side of the upper end surface 402a-2, and the inner peripheral side forms a spring seat of the first spring member 404.
- the first movable iron core 402 a is urged in the valve closing direction by the first spring member 404.
- the first movable iron core 402a is formed with a recess 402a-3 that is recessed from the end surface (lower end surface) side opposite to the upper end surface 402a-2 toward the upper end surface 402a-2, and this recess 402a-3.
- An enlarged diameter portion 101 a formed at the upper end portion of the plunger rod 101 is inserted into the plunger rod 101.
- the first movable iron core 402a and the enlarged diameter portion 101a of the plunger rod 101 are not fixed and can be relatively displaced in the direction of the central axis 1a (the on-off valve operating direction).
- the outer peripheral surface of the enlarged diameter portion 101a is in sliding contact with the inner peripheral surface of the concave portion 402a-3 of the first movable iron core 402a, and the movement of the plunger rod 101 (valve element 303) in the opening / closing valve direction is the inner peripheral surface of the concave portion 402a-3. It is the composition guided by.
- a disc portion 402b-5 is formed on the second movable iron core 402b, and an upper end surface 402b-2 formed on the disc portion 402b-5 is connected to the end surface 401a-1 of the inner peripheral side fixed iron core 401a and the outer periphery. It faces the end surface 401b-3 of the side fixed iron core 401b.
- the upper end of the second spring member 406 is in contact with the end surface (lower end surface) 402b-3 opposite to the upper end surface 402b-2 of the second movable iron core 402b.
- the lower end of the second spring member 406 is in contact with the movable iron core 402 and the lower end surface (bottom surface) 111 b of the accommodation chamber of the second spring member 406 formed in the nozzle body 111.
- the lower end surface 111 b of the accommodation chamber constitutes a spring seat of the second spring member 406. Further, the lower end surface 111b of the storage chamber and the lower end surface 402b-3 of the second movable iron core 402b are opposed to each other. The second movable iron core 402b is urged by the second spring member 406 in the valve opening direction.
- the second movable iron core 402b is formed with a convex portion 402b-5 formed in an annular shape in the circumferential direction at the small diameter portion below the disc portion 402b-4.
- the convex portion 402b-5 contacts the inner peripheral surface 111c of the nozzle body 111, and the second movable iron core 402b is guided by the inner peripheral surface 111c in the direction of the central axis 1a. That is, the inner peripheral surface 111c constitutes a guide surface that guides the movement of the second movable iron core 402b in the opening / closing valve direction.
- the outer peripheral surface 402a-1 abuts on the inner peripheral surface 402b-6 of the recess 402b-1 of the second movable iron core 402b, and the first movable iron core 402a moves in the direction of the central axis 1a.
- the inner peripheral surface 402b-6 constitutes a guide surface that guides the movement of the first movable iron core 402a in the on-off valve direction.
- the first movable iron core 402a and the second movable iron core 402b are configured to be relatively displaceable in the direction of the central axis 1a, and the first movable iron core 402a is defined by the inner peripheral surface 111c via the second movable iron core 402b. Guided.
- a gap exists g 2.
- the size of the gap g 1 is set larger than the size of the gap g 2 .
- the first movable iron core 402a is urged in the valve closing direction by the first spring member 404, and stops in a state where the bottom surface of the concave portion 402a-3 is in contact with the upper end surface of the enlarged diameter portion 101a of the plunger rod 101. ing. At this time, the lower end surface 402a-4 of the first movable iron core 402a and the bottom surface 402b-7 of the second movable iron core 402b come into contact with each other, so that the first movable iron core 402a is opened by the second spring member 406. The second movable iron core 402b biased in the direction is pushed back in the valve closing direction.
- the size of the gap g 3 is smaller than the size of the gap g 2 .
- the gap g 1 is provided to obtain a preliminary stroke described later.
- the configuration of the magnetic path in the electromagnetic drive unit 4 and the on / off valve operation of the electromagnetic fuel injection valve 1 will be described.
- the coil 403 When the coil 403 is energized in the closed state (the state shown in FIG. 2), the generated magnetic flux is the inner peripheral side fixed core 401a, the movable core 402, the outer peripheral side fixed core 401b, and the first outer peripheral side fixed core 401b. ⁇ 1, and flows through an annular magnetic path B composed of the second outer peripheral fixed core portion 401b-2 and the upper fixed core 401c.
- the end surface 401a-1 of the inner peripheral side fixed iron core 401a and the end surface 401b-3 of the outer peripheral side fixed iron core 401b constitute magnetic poles, respectively, and attract the first movable iron core 402a and the second movable iron core 402b.
- the direction in which the magnetic flux flows through the magnetic path B can be opposite to the direction of the arrow shown in FIG.
- the first movable iron core 402a is attracted to the magnetic pole 401a-1
- the second movable iron core 402b is attracted to the magnetic pole 401a-1 and the magnetic pole 401b-3, Each moves in the valve opening direction.
- the second movable iron core 402b is moved gaps (pre-stroke) g 3 described above
- the bottom surface 402b-7 of the second movable iron core 402b abuts against the lower end surface 101a-1 of the enlarged diameter portion 101a of plunger rod 101. By this contact, the second movable iron core 402b and the plunger rod 101 move together in the valve opening direction.
- the plunger rod 101 is closed until the second movable iron core 402b comes into contact, and starts moving after the second movable iron core 402b comes into contact with the valve. Thereby, it is possible to prevent the delay time from the start of energization to the coil until the second movable iron core 402b starts moving by receiving the magnetic attraction force from affecting the operation of the plunger rod 101.
- the upper end surface (suction surface) 402a-2 of the first movable iron core 402a and the upper end surface (suction surface) 402b-2 of the second movable iron core 402b are fixed to the end surface 401a-1 of the inner peripheral side fixed core 401a and the outer peripheral side fixed.
- the valve opening operation is completed and the valve opening stationary state is established.
- the enlarged diameter portion 101a of the plunger rod 101 receives the fuel pressure and is biased in the valve closing direction, so that the lower end surface 101a-1 of the enlarged diameter portion 101a is the bottom surface of the second movable iron core 402b. 402b-7. Therefore, between the upper end surface of the concave portion 402a-3 of the bottom surface and the enlarged diameter portion 101a of the first movable iron core 402a, a gap corresponding to the gap g 3 is formed as a pre-stroke. Further, a gap (g 1 -g 2 ) is generated between the lower end surface 402a-4 of the first movable iron core 402a and the bottom surface 402b-7 of the second movable iron core 402b.
- the valve opening operation is performed during the period from when the first movable iron core 402a and the second movable iron core 402b start to receive magnetic attraction force in the valve closed stationary state until the full stroke is moved to the valve opened stationary state. Called the period.
- the magnetic attractive force is rapidly reduced.
- the first movable iron core 402a is urged in the valve closing direction by the first urging spring member 404, the magnetic attractive force cannot resist the urging force of the first urging spring member 404.
- the first movable iron core 402a starts moving in the valve closing direction.
- the second movable iron core 402b is urged in the valve opening direction by the second spring member 406, it remains stationary. Since the plunger rod 101 is biased in the valve opening direction by the second spring member 406 via the second movable iron core 402b, the plunger rod 101 also remains stationary.
- the first movable iron core 402a moves through the gap (g 1 -g 2 ) generated between the bottom surface 402b-7 of the second movable iron core 402b, the lower end surface 402a-4 of the first movable iron core 402a is
- the first movable iron core 402a and the second movable iron core 402b are integrally moved in the valve closing direction by contacting the bottom surface 402b-7 of the second movable iron core 402b.
- the plunger rod 101 also moves in the valve closing direction.
- the plunger rod 101 stops moving in the valve closing direction. At this time, the plunger rod 101 may be slightly rebounded.
- the bottom surface of the recess 402a-3 of the first movable iron core 402a comes into contact with the upper end surface of the enlarged diameter portion 101a of the plunger rod 101, and the first movable iron core 402a
- the plunger rod 101 is integrated. Even after the plunger rod 101 stops moving in the valve closing direction, the second movable iron core 402b is separated from the first movable iron core 402a by the inertial force and continues to move in the valve closing direction.
- valve closing operation is completed in a state where the first movable iron core 402a and the second movable iron core 402b are integrated.
- a period from the interruption of energization to the coil 403 to the completion of the valve closing operation until the valve closed stationary state is referred to as a valve closing operation period.
- the mass of the mover is reduced by the operation of separating the second movable core 402b from the first movable core 402a, and the valve body 303 (plunger rod 101) is rebounded. Can be suppressed.
- FIG. 3 is an enlarged vertical sectional view showing the vicinity of the magnetic poles 401a-1 and 401b-3 indicated by a broken line circle A in FIG.
- FIG. 4 is a longitudinal sectional view showing the configuration of the assembly of the fixed iron core 401.
- the nonmagnetic portion 401d is composed of an annular member, and an annular recess 401d-1 is formed along the circumferential direction on the outer peripheral surface side.
- the space between the outer peripheral surface of the fixed iron core 401a is sealed. Further, the first outer peripheral fixed core portion 401b-1 and the nonmagnetic portion 401d are fixed by welding all around the position indicated by W1, and the outer peripheral surface of the nonmagnetic portion 401d and the first outer peripheral fixed core portion are fixed. The space between the inner peripheral surface of 401b-1 is sealed.
- the all-round welding indicated by W1 is performed at the stage where the nonmagnetic portion 401d is assembled to the outer peripheral surface of the inner peripheral side fixed iron core 401a.
- the coil 403 wound around the bobbin 407, the outer peripheral side fixed iron core 401b, the upper fixed iron core 401c, and the nozzle body 111 are not assembled. Therefore, welding can be performed by applying energy for welding from the outer peripheral surface side of the nonmagnetic portion 401d.
- a welding method for example, laser welding can be used.
- laser welding a laser beam is irradiated from the outer peripheral surface side of the nonmagnetic portion 401d to the bottom surface of the recess 401d-1.
- the nonmagnetic portion 401d may be welded to the inner peripheral side fixed iron core 401a all around the nonmagnetic portion 401d in a state where the nonmagnetic portion 401d is assembled to the inner peripheral side fixed iron core 401a.
- the all-round welding indicated by W2 is performed at the stage where the first outer peripheral side fixed core 401b-1 is assembled to the assembly of the inner peripheral side fixed core 401a and the nonmagnetic portion 401d.
- the coil 403 wound around the bobbin 407, the second outer peripheral side fixed core 401b-2, the upper fixed core 401c, and the nozzle body 111 are not assembled. Therefore, welding can be performed by applying energy for welding to the surface of the nonmagnetic portion 401d and the first outer peripheral side fixed core portion 401b-1 opposite to the end surface 401b-3 facing the movable core 402. it can.
- a welding method for example, laser welding can be used.
- the end surface is irradiated with a laser beam from the end surface side opposite to the end surface 401b-3 facing the movable core 402 of the nonmagnetic portion 401d and the first outer peripheral fixed core portion 401b-1.
- the second outer peripheral side fixed core portion 401b-2 is not assembled, so that it is easy to apply energy to the welded portion, and in the case of laser welding, laser beam irradiation becomes easy.
- the upper end portion of the first outer peripheral side fixed core portion 401b-1 is provided with a thin portion 401b-1a for mounting the second outer peripheral side fixed core portion 401b-2.
- the height h of the thin portion 401b-1a should be lowered while securing the fixing accuracy and rigidity with the second outer peripheral side fixed core portion 401b-2. preferable.
- the welds W1 and W2 are connected to the end surface (the end surface 401b-3 of the first outer peripheral side fixed core portion 401b-1 and the inner peripheral side fixed core portion 401a) facing the movable core 402 of the fixed core 401.
- This can be implemented by applying energy to a surface different from the end surface 401a-1).
- transformation which arise in the end surface side which opposes the movable iron core 402 of the fixed iron core 401 can be prevented or suppressed.
- the welding W1 can be performed from the direction perpendicular to the outer peripheral surfaces of the nonmagnetic portion 401d and the inner peripheral fixed core 401a, the reliability of the welded portion is improved.
- FIG. 5 is a perspective view of members constituting the nonmagnetic portion 401d.
- FIG. 6 is a view showing a VI-VI cross section of FIG. 5 for members constituting the nonmagnetic portion 401d.
- the surface 401d-6 and the surface 401d-7 of the member constituting the nonmagnetic part 401d are brought into contact with the inner peripheral surface of the first outer peripheral fixed core 401b-1.
- the length of the first outer peripheral side fixed iron core 401b-1 supported by the member constituting the nonmagnetic portion 401d in the direction of the central axis 1a is increased, and the first outer peripheral side fixed iron core 401b- during assembly is increased.
- the inclination of 1 is less likely to occur.
- the surface 401d-7 is made lower than the surface 401d-6 by S3 so that the surface 401d-7 does not come into contact with the inner peripheral surface of the first outer fixed iron core 401b-1. I have to.
- the surface 401d-6 side needs to be brought into contact with the inner peripheral surface of the first outer peripheral fixed core 401b-1.
- the length S1 of the surface 401d-6 in the direction of the central axis 1a is made longer than the length S2 of the surface 401d-7. It is also long. Thereby, the excessive raise of a press-fit load can be prevented.
- the surface 401d-7 may be set to the same height as the bottom surface of the annular recess 401d-1, and may be formed as one surface together with the bottom surface of the annular recess 401d-1.
- the second outer peripheral side fixed core portion 401b- 2 is assembled. This assembly is also performed by press fitting. Thin portions 401b-1a and 401b-2a are provided at the fitting portions of the first outer peripheral fixed core 401b-1 and the second outer fixed core 401b-2, respectively.
- welding W3 is performed, and the thin portion 401b-1a and the thin portion 401b-2a are fixed.
- a welding method for example, laser welding can be used.
- the sealing function is not required for the welding W3, it is not necessary to perform all-around welding, and spot welding may be used.
- FIG. 1 A longitudinal sectional view of the assembly 150 is shown in FIG.
- the inner peripheral side fixed iron core 401a and the fuel pipe 201 are integrated and integrally molded into one member.
- the central axis formed substantially linearly along the central axis 1a from the fuel supply port 201a to the opening formed on the end surface facing the movable core 402 of the inner peripheral side fixed core 401a.
- a through-hole 105 is formed in the direction.
- the central axial direction through hole 105 is used as a fuel passage and also serves as a storage space for storing the first spring member 404 and the spring force adjusting member 405.
- the upper fixed core 401c is not assembled, and the coil 403 is interposed between the outer peripheral surface of the inner peripheral side fixed core 401a and the inner peripheral surface of the second outer peripheral side fixed core portion 401b-2.
- a storage space 401e for storing the storage space is configured.
- the coil 403 wound around the bobbin 407 is attached to the accommodation space 401e of the assembly 150, and then the upper fixed iron core 401c is attached to the upper opening of the accommodation space 401e.
- the upper fixed core 401c is press-fitted into the outer peripheral surface of the inner peripheral side fixed core 401a, and welding W4 is performed by applying energy from the outer peripheral surface of the outer peripheral side fixed core portion 401b-2.
- welding W4 may be spot welding.
- the outer peripheral side fixed iron core part 401b-2 and the upper fixed iron core 401c are fixed. Further, the upper fixed iron core 401c is fixed to the inner peripheral fixed iron core 401a by welding W5 from the upper surface of the upper fixed iron core 401c. Further, since the welding W5 does not require a sealing function, spot welding may be used.
- a terminal 119 electrically connected to the coil 403 is drawn out from the upper fixed iron core 401c.
- the resin mold 120 is applied to the periphery of the coil 403 in the accommodation space 401e (see FIG. 4) and the periphery of the terminal 119 on the upper fixed iron core 401c.
- the resin mold 120 forms a connector 120 a around the terminal 119.
- the mover composed of the movable iron core 402 and the plunger rod 101 and the second spring member 406 are housed in the housing space 111d of the nozzle body 111, and the nozzle body 111 is fixed. It is fixed to the assembly on the iron core 401 side.
- This fixing is performed by applying energy from the outer peripheral surface of the upper end portion 111e of the nozzle body 111 and performing the all-around welding W6.
- a welding method for example, laser welding can be used.
- the injection hole forming member 301 and the guide member 302 may be assembled to the nozzle body 111, or after the nozzle body 111 is assembled to the assembly on the fixed iron core 401 side.
- the guide member 302 may be assembled to the nozzle body 111. It is necessary to adjust the stroke of the valve body 303 (plunger rod 101), and the procedure for assembling the injection hole forming member 301 and the guide member 302 and the nozzle body 111 can be changed depending on the stroke. The description of stroke adjustment is omitted.
- FIGS. 7 to 9 are enlarged longitudinal sectional views showing the vicinity of the magnetic poles 401a-1 and 401b-3 indicated by broken lines in FIG. 2, similarly to FIG.
- the members constituting the nonmagnetic part 401d may be shaped as shown in FIG. That is, on the cross section (longitudinal cross section) including the central axis 1a and parallel to the central axis 1a, the cross section of the member constituting the nonmagnetic portion 401d has a wedge shape. At this time, the wedge shape is such that the width on the side facing the movable iron core 402 is wider than the width on the opposite side (coil 403 side). Fuel pressure acts on the member constituting the nonmagnetic portion 401d from the surface facing the movable iron core 402 toward the coil 403 side. By adopting the wedge shape, the fuel pressure acts on the members constituting the nonmagnetic portion 401d in a direction that improves the sealing performance. Therefore, the reliability of sealing by the member constituting the nonmagnetic portion 401d can be enhanced by making the member constituting the nonmagnetic portion 401d into the shape of FIG.
- the welded portion W1 between the nonmagnetic portion 401d and the inner peripheral fixed core 401a and the welded portion W2 between the nonmagnetic portion 401d and the first outer peripheral fixed core 401b-1 are movable. This is implemented by applying energy (irradiating a laser beam) to a surface different from the surface facing the iron core 402.
- energy irradiating a laser beam
- two welds W1 and W2 can be performed on the surface opposite to the surface facing the movable core 402.
- the member constituting the nonmagnetic portion 401d may be assembled to the first outer peripheral side fixed core portion 401b-1 before being assembled to the inner peripheral side fixed iron core 401a, and then assembled to the inner peripheral side fixed iron core 401a. Is possible.
- the members constituting the nonmagnetic portion 401d may have a vertical cross-sectional shape that is not wedge-shaped but rectangular (or square) as shown in FIG. That is, the members constituting the nonmagnetic portion 401d are formed in a simple cylindrical shape.
- the radial length of the end surface 401b-3 of the first outer peripheral side fixed core portion 401b-1 and the end surface 401a-1 of the inner peripheral side fixed core 401a facing the mover core 402 is increased to increase the magnetic pole surface.
- the longitudinal cross-sectional shape of the member which comprises the nonmagnetic part 401d has a preferable rectangle rather than a square.
- the welds W1 and W2 are the same as the shape of FIG.
- the member constituting the nonmagnetic portion 401d may have a longitudinal cross-sectional shape bent at 90 degrees (right angle) as shown in FIG. That is, the member constituting the nonmagnetic portion 401d has a shape having a cylindrical portion and an annular disc portion (flange portion) connected to the upper end of the cylindrical portion. Also in this example, welding W1 and W2 can both be performed on the surface opposite to the surface facing the movable core 402. Furthermore, in this example, since the member which comprises the nonmagnetic part 401d has a flange part, when performing welding W2, the precision of a welding position is not severe compared with the shape of FIG.3, FIG.7 and FIG.8. .
- 10 to 12 are enlarged longitudinal sectional views showing the vicinity of the magnetic poles 401a-1 and 401b-3 shown by broken line circles in FIG. 2, as in FIG.
- FIG. 10 the configuration of FIG. 10 will be described.
- the configuration of FIG. 10 is a basic form.
- the inner peripheral side fixed core 401a and the first outer peripheral side fixed core 401b-1 are constituted by one component (one member) connected by a nonmagnetic portion 401d-2.
- the nonmagnetic portion 401d-1 is originally a magnetic material, but has been made nonmagnetic by performing a demagnetization treatment such as heat treatment.
- a gap 401d-2 is formed on the surface of the nonmagnetic portion 401d-1 facing the movable core 402, and the gap 401d-2 formed by the gap 401d-2 and the nonmagnetic portion 401d-1 are not separated.
- the magnetic part 401d is configured.
- the gap 401d-2 is configured by an annular recess (groove) formed between the end surface 401a-1 of the inner peripheral side fixed core 401a and the end surface 401b-3 of the first outer peripheral side fixed core 401b-1. Has been.
- non-magnetization treatment such as heat treatment for constituting the non-magnetic portion 401d-1 is necessary.
- energy for heat treatment is applied by irradiating the surface opposite to the surface facing the movable core 402 of the nonmagnetic portion 401d-1 with a laser beam. Even if the irradiation surface is distorted by irradiating the laser beam, it is a surface opposite to the surface facing the movable core 402, and therefore the influence on the surface facing the movable core 402 should be reduced. Can do.
- the number of parts can be reduced, the labor required for positioning each part can be reduced, and the assembly time can be shortened.
- the inner peripheral side fixed core 401a, the nonmagnetic portion 401d-1 and the first outer peripheral side fixed core portion 401b-1 are one component, the sealing performance at this portion is ensured. .
- the inner peripheral side fixed iron core 401a, the nonmagnetic part 401d-1, and the first outer peripheral side fixed iron core part 401b-1 can be constituted by two parts as shown in FIGS.
- the nonmagnetic portion 401d-1 is formed on the first outer peripheral side fixed core portion 401b-1, and the nonmagnetic portion 401d-1 and the first outer peripheral side fixed core portion 401b-1 are formed. It consists of one part.
- a joining surface 401d-4 with the inner peripheral side fixed iron core 401a is formed at an end of the nonmagnetic portion 401d-1 on the inner peripheral side fixed iron core 401a side.
- Sealing performance can be ensured by performing one-round welding W1 on the joint between the nonmagnetic portion 401d-1 and the inner peripheral side fixed iron core 401a.
- Welding W1 applies energy for welding by irradiating the surface opposite to the surface facing the movable core 402 of the nonmagnetic portion 401d-1 and the inner peripheral side fixed core 401a with a laser beam. Even if the irradiation surface is distorted by irradiating the laser beam, it is a surface opposite to the surface facing the movable core 402, and therefore the influence on the surface facing the movable core 402 should be reduced. Can do.
- the non-magnetic portion 401d-1 and the inner peripheral side fixed iron core 401a may be assembled by press fitting to perform welding W1.
- the nonmagnetic portion 401d-1 is formed on the inner peripheral side fixed core 401a side, and the nonmagnetic portion 401d-1 and the inner peripheral side fixed core 401a are configured as one part.
- a joining surface 401d-5 with the first outer peripheral fixed core portion 401b-1 is formed at the end portion on the first outer peripheral fixed core portion 401b-1 side of the nonmagnetic portion 401d-1. For this reason, the sealing performance can be ensured by performing the entire circumference welding W2 at one place on the joint portion between the nonmagnetic portion 401d-1 and the first outer peripheral side fixed core portion 401b-1.
- Welding W2 irradiates the surface opposite to the surface facing the movable core 402 of the non-magnetic portion 401d-1 and the first outer peripheral side fixed core portion 401b-1 with a laser beam to perform energy for welding. Is added. Even if the irradiation surface is distorted by irradiating the laser beam, it is a surface opposite to the surface facing the movable core 402, and therefore the influence on the surface facing the movable core 402 should be reduced. Can do.
- the non-magnetic portion 401d-1 and the first outer peripheral side fixed core portion 401b-1 may be assembled by press-fitting to perform welding W2.
- the number of parts is increased by one compared to the configuration of FIG. 10, but the number of parts can be reduced by one compared to the first embodiment.
- nonmagnetic portion 401 will be described as a part of the fixed iron core 401.
- Example 1 and Example 2 welding or demagnetization is performed on a surface (referred to as a second surface) opposite to a surface (referred to as a first surface) facing the movable core 402 of the stator core 401.
- Energy for processing is injected.
- the distortion and deformation generated on the second surface do not affect or hardly affect the first surface.
- the second surface is irradiated with the laser beam. In the following, description will be made on laser welding or a demagnetization process using a laser beam.
- the laser beam irradiation portion is located at the bottom of an annular recess surrounded by the inner peripheral side fixed core 401a and the outer peripheral side fixed core 401b. Therefore, the outer peripheral side fixed iron core 401b is divided into two parts (first outer peripheral side fixed iron core 401b-1 and second outer peripheral side fixed iron core 401b-2). The position where the outer peripheral side fixed core 401b is divided into the first outer peripheral side fixed core 401b-1 and the second outer peripheral side fixed core 401b-2 is lower than the upper end 403 of the winding portion of the coil 403 (end face) 401b-3 side). Accordingly, the weld joint position W3 between the first outer peripheral side fixed core 401b-1 and the second outer peripheral side fixed core 401b-2 is also lower than the upper end portion 403 of the winding part of the coil 403.
- the outer peripheral surface of the second outer peripheral side fixed core 401b-2 and the outer peripheral surface of the first outer peripheral side fixed iron core 401b-1 are the outer peripheral surface of the metallic housing located at the uppermost part of the electromagnetic drive unit 4, respectively.
- the outer peripheral surface of the metal housing located in the lower part is comprised.
- the outer peripheral surface of the metal housing surrounding the outer periphery of the movable iron core 402 of the electromagnetic drive unit 4 is composed of the outer peripheral surface of the nozzle body 111.
- the nozzle body 111 includes an outer peripheral surface of the second outer peripheral fixed core 401b-2 and an outer peripheral surface of the first outer peripheral fixed core 401b-1. It must be divided with respect to the outer peripheral surface of the metal housing constituted by The dividing position is on the movable iron core side end surface of the fixed core 401, that is, above the end surface 401b-3 of the first outer peripheral side fixed core 401b-1 (the outer peripheral surface side of the second outer peripheral side fixed core 401b-2).
- the outer peripheral surface of the metal material housing surrounding the electromagnetic drive unit 4 is composed of the outer peripheral surfaces of three metal material parts.
- the center line 401b-5 of the outer peripheral side fixed iron core 401b changes its direction in the radial direction at the first outer peripheral side fixed iron core 401b-1, as shown in FIG. That is, the center line 401b-5 is displaced in the radial direction between the surface facing the movable iron core 402 and the side opposite to the surface facing the portion where the center line 401b-5 is changed in the radial direction.
- the center line 401b-5 is radially inward (center side) from the outer peripheral end of the winding portion of the coil 403.
- the outer peripheral side fixed iron core 401b includes a magnetic path portion parallel to the inner peripheral side fixed iron core 401a below the winding part of the coil 403.
- at least a part of the end surface 401b-3 constituting the magnetic pole of the first outer peripheral fixed iron core 401b-1 is disposed at a position sandwiched between the winding portion of the coil 403 and the movable iron core 402.
- the magnetic path of the outer peripheral fixed core 401 b is provided so as to go around from the outer peripheral side of the coil 403 to the lower side of the coil 403, and the magnetic pole surface is radially inward of the outer peripheral side end of the coil 403 ( (Center side).
- the magnetic pole area of the outer peripheral side fixed iron core 401b can be secured without increasing the outer diameter of the main body of the electromagnetic fuel injection valve 1.
- the vertical cross-sectional shape of the non-magnetic portion 401d has a shape in which the length in the central axis 1a direction is longer than the radial width.
- magnetism When energy for welding is injected into a member made of a magnetic material and heated, magnetism may be lost or reduced. In particular, when there is no need for a sealing function, spot welding or the like may be performed to limit the heated portion to a narrow range. In addition, the magnetism decreased by heating by welding can be recovered by annealing.
- this invention is not limited to each above-mentioned Example, Various modifications are included.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations.
- a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
- connector, 150 ... assembly, 201 ... fuel pipe, 201a ... fuel supply port, 201b ... enlarged diameter part of fuel pipe 201, 202 ... O Ring, 203a, 203b ... backup ring, 204 ... filter, 301 ... injection hole forming member, 301a ... fuel injection hole, 301b ... valve seat, 302 ... guide part , 302a ... fuel passage, 303 ... valve, 401 ... fixed iron core, 401a ... inner peripheral side fixed iron core, 401a-1 ... end surface of inner peripheral side fixed iron core 401a, 401a-2 ... end of inner peripheral side fixed iron core 401a , 401b ... outer peripheral side fixed iron core, 401b-1 ...
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Abstract
Description
また、第1の可動鉄心402aの下端面402a-4と第2の可動鉄心402bの底面402b-7との間には、ギャップ(g1-g2)が生じている。
Claims (10)
- コイル、固定鉄心、及び可動鉄心を有する電磁駆動部と、前記電磁駆動部によって駆動されて開閉弁動作する弁体を有する弁部とを備え、前記固定鉄心がコイルを挟んで外周側に外周側磁路を構成する外周側固定鉄心と内周側に内周側磁路を構成する内周側固定鉄心とを備え、前記外周側固定鉄心の磁極を構成する端面及び前記内周側固定鉄心の磁極を構成する端面が前記弁体の開閉弁動作方向に形成されるギャップを挟んで前記可動鉄心と対向し、前記コイルに通電することにより前記可動鉄心が前記ギャップ間を移動する電磁式燃料噴射弁において、
前記外周側固定鉄心の前記端面が形成された端部と前記内周側固定鉄心の前記端面が形成された端部との間に挟まれた位置に設けられ、前記可動鉄心と対向する非磁性部を備え、
前記非磁性部は、熱処理を行うためのエネルギ注入部が前記可動鉄心との対向面とは異なる位置に設けられたことを特徴とする電磁式燃料噴射弁。 - 請求項1に記載の電磁式燃料噴射弁において、
前記外周側固定鉄心は、前記可動鉄心と対向する端面を有する第1の外周側固定鉄心部分と、前記可動鉄心との対向面とは反対の端部側を構成する第2の外周側固定鉄心部分とに分割され、前記第1の外周側固定鉄心部分の外周面と前記第2の外周側固定鉄心部分の外周面とがハウジングの外周面を構成していることを特徴とする電磁式燃料噴射弁。 - 請求項2に記載の電磁式燃料噴射弁において、
前記第1の外周側固定鉄心部分と前記第2の外周側固定鉄心部分との分割部は、前記コイルの巻回部における可動鉄心側とは反対側の端部よりも可動鉄心側に位置することを特徴とする電磁式燃料噴射弁。 - 請求項3に記載の電磁式燃料噴射弁において、
前記第1の外周側固定鉄心部分における前記第2の外周側固定鉄心部分との分割部とは反対側に、前記可動鉄心を収容するハウジング部品が接続され、
前記電磁駆動部を収容するハウジング部の最大径となる部分が、前記第1の外周側固定鉄心部分、前記第2の外周側固定鉄心部分及び前記ハウジング部品を含む3部品を有して構成されたことを特徴とする電磁式燃料噴射弁。 - 請求項4に記載の電磁式燃料噴射弁において、
前記外周側固定鉄心の前記端面と前記内周側固定鉄心の前記端面との間の間隔が、前記コイル及び前記コイルが巻回されたボビンを含むコイル組部品の径方向寸法よりも小さく、
前記固定鉄心が前記コイル組部品を前記外周側固定鉄心及び前記内周側固定鉄心の前記端面とは反対側から組付け可能に構成されたことを特徴とする電磁式燃料噴射弁。 - 請求項5に記載の電磁式燃料噴射弁において、
前記非磁性部は環状に形成され、径方向の厚み寸法よりも中心軸方向の寸法が大きいことを特徴とする電磁式燃料噴射弁。 - 請求項6に記載の電磁式燃料噴射弁において、
前記固定鉄心は、第1の継鉄部品である前記外周側固定鉄心と、第2の継鉄部品である前記内周側固定鉄心と、前記外周側固定鉄心及び前記内周側固定鉄心の前記端面とは反対側の端部に接続されて前記外周側固定鉄心と前記内周側固定鉄心との間に橋設される第3の継鉄部品とで構成されていることを特徴とする電磁式燃料噴射弁。 - 請求項7に記載の電磁式燃料噴射弁において、
前記内周側固定鉄心と前記第1の外周側固定鉄心部分とが非磁性部分で接続された一つの部材に一体成型されており、
前記非磁性部が前記内周側固定鉄心及び前記第1の外周側固定鉄心部分を構成するのと同じ材料を非磁性化処理することにより設けられ、
前記非磁性部分の前記可動鉄心と対向する側の、前記内周側固定鉄心と前記第1の外周側固定鉄心部分との間に、空隙部が設けられ、
前記非磁性部が前記非磁性部分と前記空隙とで構成されたていることを特徴とする電磁式燃料噴射弁。 - 請求項7に記載の電磁式燃料噴射弁において、
前記内周側固定鉄心と前記第1の外周側固定鉄心部分とのうちいずれか一方に非磁性部分が一体成型されており、
前記非磁性部が前記内周側固定鉄心又は前記第1の外周側固定鉄心部分を構成するのと同じ材料を非磁性化処理することにより設けられ、
前記非磁性部分の前記可動鉄心と対向する側の、前記内周側固定鉄心と前記第1の外周側固定鉄心部分との間に、空隙部が設けられ、
前記非磁性部が前記非磁性部分と前記空隙とで構成されたことを特徴とする電磁式燃料噴射弁。 - コイル、固定鉄心、及び可動鉄心を有する電磁駆動部と、前記電磁駆動部によって駆動されて開閉弁動作する弁体を有する弁部とを備え、前記固定鉄心がコイルを挟んで外周側に外周側磁路を構成する外周側固定鉄心と内周側に内周側磁路を構成する内周側固定鉄心とを備え、前記外周側固定鉄心の磁極を構成する端面及び前記内周側固定鉄心の磁極を構成する端面が前記弁体の開閉弁動作方向に形成されるギャップを挟んで前記可動鉄心と対向し、前記コイルに通電することにより前記可動鉄心が前記ギャップ間を移動する電磁式燃料噴射弁において、
前記外周側固定鉄心の磁極を構成する端面の少なくとも一部が、前記コイルの巻回部と前記可動鉄心とに挟まれた位置に配置されていることを特徴とする電磁式燃料噴射弁。
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JP2017020478A (ja) * | 2015-07-15 | 2017-01-26 | 株式会社デンソー | 内燃機関の燃料噴射制御装置 |
CN107923548A (zh) * | 2015-08-25 | 2018-04-17 | 日立汽车系统株式会社 | 电磁阀 |
JP2018105271A (ja) * | 2016-12-28 | 2018-07-05 | 日立オートモティブシステムズ株式会社 | 燃料噴射弁 |
CN109642533A (zh) * | 2016-08-26 | 2019-04-16 | 日立汽车系统株式会社 | 燃料喷射装置的控制装置 |
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US10337448B2 (en) * | 2015-12-22 | 2019-07-02 | Ford Global Technologies, Llc | Methods and systems for a fuel injector assembly |
JP6583179B2 (ja) * | 2016-07-28 | 2019-10-02 | 株式会社デンソー | 燃料噴射弁 |
JP6520983B2 (ja) * | 2016-07-28 | 2019-05-29 | 株式会社デンソー | 燃料噴射弁、および燃料噴射弁の製造方法 |
WO2018021123A1 (ja) * | 2016-07-28 | 2018-02-01 | 株式会社デンソー | 燃料噴射弁 |
DE102017116383A1 (de) * | 2017-07-20 | 2019-01-24 | Liebherr-Components Deggendorf Gmbh | Injektor zum Einspritzen von Krafstoff |
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JP2018105271A (ja) * | 2016-12-28 | 2018-07-05 | 日立オートモティブシステムズ株式会社 | 燃料噴射弁 |
Also Published As
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US20160025052A1 (en) | 2016-01-28 |
JP6139191B2 (ja) | 2017-05-31 |
JP2014177877A (ja) | 2014-09-25 |
DE112014000707T5 (de) | 2015-12-17 |
US10288022B2 (en) | 2019-05-14 |
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