WO2018021123A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2018021123A1
WO2018021123A1 PCT/JP2017/026177 JP2017026177W WO2018021123A1 WO 2018021123 A1 WO2018021123 A1 WO 2018021123A1 JP 2017026177 W JP2017026177 W JP 2017026177W WO 2018021123 A1 WO2018021123 A1 WO 2018021123A1
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WO
WIPO (PCT)
Prior art keywords
core portion
core
center line
tapered surface
injection valve
Prior art date
Application number
PCT/JP2017/026177
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English (en)
Japanese (ja)
Inventor
誠 西前
松本　修一
英人 武田
啓太 今井
雅之 丹羽
後藤　守康
子航 袁
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
Priority claimed from JP2017085606A external-priority patent/JP6520983B2/ja
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112017003774.3T priority Critical patent/DE112017003774T5/de
Publication of WO2018021123A1 publication Critical patent/WO2018021123A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid

Definitions

  • the present disclosure relates to a fuel injection valve that injects fuel and a method of manufacturing the fuel injection valve.
  • the fuel injection valve described in Patent Literature 1 includes an annularly arranged coil, a fixed core in which a magnetic field is formed by energizing the coil, and a movable core that is attracted by forming a magnetic field between the fixed cores. And a valve body that is driven by the sucked movable core to open and close the nozzle hole.
  • a non-magnetic member is assembled to a portion of the fixed core that faces the movable core, and an inner portion of the fixed core that is radially inward of the non-magnetic member is referred to as an inner core portion, and an outer portion is referred to as an outer core portion.
  • the attractive force generated by the magnetic field formed between the outer core portion and the movable core and the attractive force generated by the magnetic field formed between the inner core portion and the movable core act on the movable core, and these attractive forces
  • the movable core is attracted to the fixed core by force.
  • the inner core portion, the nonmagnetic member, and the outer core portion are arranged side by side at a position facing the movable core, thereby generating an attractive force from both the outer core portion and the inner core portion to the movable core. Thereby, a suction
  • the present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a fuel injection valve that achieves both improvement in attractive force and suppression of breakage of the joint surface between the fixed core and the nonmagnetic member. is there.
  • This disclosure employs the following technical means in order to achieve the above object.
  • 1st aspect of this indication is a fuel injection valve which injects a fuel from an injection hole, Comprising: The coil arrange
  • a restriction member that restricts movement of at least one of the inner core portion and the outer core portion to the opposite side of the movable core under the pressure of the fuel, and the inner core portion and the outer core portion.
  • Non-magnetic, weaker than fixed core An inner taper surface that is a surface that is inclined with respect to the annular center line in a cross section including the annular center line.
  • An outer taper surface that is a surface that is inclined with respect to the annular center line in a cross-section including the annular center line is formed on at least a part of the surface to be joined to the nonmagnetic member in the outer core portion, The inner tapered surface and the outer tapered surface are inclined in the same direction with respect to the annular center line.
  • a second aspect of the present disclosure is a fuel injection valve that injects fuel from an injection hole, and includes an annularly arranged coil, a fixed core that forms a magnetic field when the coil is energized, and an annular centerline of the coil Is provided on the nozzle hole side of the fixed core in the direction of, and when the coil is energized, a magnetic field is formed between the fixed core and driven by the movable core that is attracted to the fixed core,
  • a fixed core is located outside the inner core portion with respect to the annular center line and is opposed to the movable core.
  • a restriction member that restricts movement of at least one of the inner core portion and the outer core portion to the opposite side of the movable core under the pressure of the fuel, and the inner core portion and the outer core portion.
  • Non-magnetic, weaker than fixed core An inner crossing surface that is a surface that is in a direction that intersects the annular centerline in a cross-section including the annular centerline, at least a part of the surface that joins the nonmagnetic member of the inner core portion And at least a part of the surface of the outer core portion to be joined to the nonmagnetic member is formed with an outer intersecting surface that is a surface that intersects the annular centerline in a cross section including the annular centerline. At least one of the inner intersecting surface and the outer intersecting surface has a step shape extending perpendicular to the annular center line.
  • a third aspect of the present disclosure includes an annularly arranged coil, a fixed core that forms a magnetic field when the coil is energized, and an injection hole that injects fuel from the fixed core in the direction of the annular center line of the coil.
  • a movable core that forms a magnetic field between the fixed core and is attracted to the fixed core when the coil is energized, and a valve element that is driven by the attracted movable core to open and close the nozzle hole
  • the fixed core includes an inner core portion that faces the movable core, and an outer core portion that is located outside the inner core portion with respect to the annular center line and faces the movable core, and the inner core portion and Located between the inner core portion and the outer core portion, the magnet is weaker than the fixed core, and is disposed between the inner core portion and the outer core portion, which restricts movement of at least one of the outer core portions to the opposite side of the movable core under the pressure of the fuel
  • a non-magnetic member A method for manufacturing a fuel injection valve
  • the outer taper surface which is a surface inclined in the same direction as the inner taper surface with respect to the annular center line in the cross section including the annular center line is formed on the surface of the outer core portion to be joined to the nonmagnetic member.
  • the inner core portion and the outer core portion are provided in a portion of the fixed core that faces the movable core, and these inner core portion and outer core portion.
  • a non-magnetic member is disposed between the two. Therefore, the magnetic short circuit between the inner core portion and the outer core portion is avoided by the nonmagnetic member.
  • the attractive force generated by the magnetic field formed between the outer core portion and the movable core, and the attractive force generated by the magnetic field formed between the inner core portion and the movable core act on the movable core.
  • These movable forces attract the movable core to the fixed core. Therefore, since the suction force is generated in the movable core from both the outer core portion and the inner core portion, the suction force can be improved.
  • an inner taper surface is formed in at least one part of the surface joined to a nonmagnetic member among inner core parts, and a nonmagnetic member among outer core parts
  • An outer tapered surface is formed on at least a part of the surfaces to be joined.
  • the inner tapered surface and the outer tapered surface are inclined in the same direction with respect to the annular center line. Therefore, when the pressure of the fuel is received in the direction in which the fixed core moves to the opposite side of the movable core and the movement is regulated by the regulating member, the inner taper surface has a force directed radially outward from the inner core portion. In addition, a force directed radially inward from the outer core portion is applied to the outer tapered surface.
  • the nonmagnetic member is sandwiched between the inner core portion and the outer core portion. Therefore, it is possible to reduce the concern that the joint surface between the inner core portion and the nonmagnetic member and the joint surface between the outer core portion and the nonmagnetic member are damaged.
  • At least a part of a surface of the inner core portion that is joined to the nonmagnetic member is formed with an inner crossing surface, and at least a surface of the outer core portion that is joined to the nonmagnetic member is formed.
  • an outer crossing surface is formed.
  • at least one of these inner side crossing surfaces and outer side crossing surfaces is a level
  • the fixed core receives the pressure of the fuel in the direction of moving to the opposite side of the movable core and the movement is regulated by the regulating member, the annular center line from one of the outer core portion and the inner core portion to the other Even if a force (normal force) is applied in the direction of, the normal force is applied to the step-shaped intersection surface. Therefore, the force applied in the axial direction can be reduced on the surface other than the intersecting surface of the joint surface between the inner core portion or the outer core portion and the nonmagnetic member. Therefore, the concern that the joint surface is damaged can be reduced.
  • both the first aspect and the second aspect can achieve both improvement of the attractive force and suppression of breakage of the joint surface between the fixed core and the nonmagnetic member.
  • FIG. 21 is a cross-sectional view of a fuel injection valve manufactured by the procedure of FIG.
  • the flowchart which shows the procedure of the manufacturing method which concerns on 16th Embodiment.
  • the fuel injection valve shown in FIG. 1 is mounted on an ignition internal combustion engine (gasoline engine), and directly injects fuel into each combustion chamber of a multi-cylinder engine.
  • the fuel supplied to the fuel injection valve is pumped by a fuel pump (not shown), and the fuel pump is driven by the rotational driving force of the engine.
  • the fuel injection valve includes a case 10, a nozzle body 20, a valve body 30, a movable core 40, a fixed core 50, a nonmagnetic member 60, a coil 70, a pipe connection portion 80, and the like.
  • the case 10 is made of metal and has a bottomed cylindrical shape extending in a direction in which the annular center line C of the coil 70 extends (hereinafter referred to as an axial direction).
  • An outflow side opening 10b is formed on the bottom surface 10a of the case 10, and an inflow side opening 10c is formed on the opposite side of the case 10 from the bottom surface 10a.
  • the annular center line C of the coil 70 coincides with the center lines of the case 10, the nozzle body 20, the valve body 30, the movable core 40, the fixed core 50 and the nonmagnetic member 60.
  • the nozzle body 20 is made of metal and is inserted into the case 10 from the inflow side opening 10c.
  • the nozzle body 20 includes a main body portion 21 that is located inside the case 10 and engages with the bottom surface 10a, and a nozzle portion 22 that extends from the outflow side opening 10b to the outside of the case 10.
  • the nozzle portion 22 has a cylindrical shape extending in the axial direction, and an injection hole member 23 is attached to the tip of the nozzle portion 22.
  • the injection hole member 23 is made of metal, and is fixed to the nozzle portion 22 by welding.
  • the injection hole member 23 has a bottomed cylindrical shape extending in the axial direction, and an injection hole 23 a for injecting fuel is formed at the tip of the injection hole member 23.
  • a seating surface 23 s on which the valve body 30 is seated is formed on the inner peripheral surface of the injection hole member 23.
  • the valve element 30 is made of metal and has a cylindrical shape extending along the axial direction.
  • the valve body 30 is assembled in the nozzle body 20 so as to be movable in the axial direction, and an annular fuel extending in the axial direction between the outer peripheral surface 30a of the valve body 30 and the inner peripheral surface 22a of the nozzle body 20.
  • a passage 22b is formed.
  • An annular seat surface 30s is formed at the end of the valve body 30 on the nozzle hole 23a side so as to be separated from and seated on the seating surface 23s.
  • a fuel passage 30b extending in the axial direction is formed at an end portion of the valve body 30 opposite to the injection hole 23a (hereinafter referred to as an anti-injection hole side), and a fuel passage 30b inside the valve body 30 is formed.
  • a through hole 30c communicating with the external fuel passage 22b is formed.
  • the movable core 40 has a metal disk shape, and is accommodated and disposed in a concave accommodation chamber 21 a formed on the side opposite to the injection hole of the main body 21.
  • the movable core 40 is fixed to the end of the valve body 30 opposite to the injection hole.
  • the valve body 30 is inserted and disposed in a through hole 41 formed at the center of the movable core 40.
  • An engaging portion 31 extending in the radial direction of the valve body 30 is formed at the end of the valve body 30 on the side opposite to the injection hole.
  • the engaging portion 31 is fitted into and engaged with the concave portion of the movable core 40, and the movable core 40 and the valve body 30 are joined by welding in a state where the engaging portion 31 is in contact with the bottom surface 42 of the concave portion. . Therefore, the movable core 40 moves integrally with the valve body 30 in the axial direction.
  • the surfaces of the movable core 40 and the engagement portion 31 on the side opposite to the injection hole are located on the same plane and are perpendicular to the axial direction.
  • the fixed core 50 has an outer core portion 51, an inner core portion 52, and a lid portion 53 described below.
  • the fixed core 50 is fixedly disposed inside the case 10.
  • the structure of the fixed core 50 will be described with reference to FIGS. 2, 3 and 4 in addition to FIG.
  • the outer core portion 51 is made of an annular metal that extends around the axial direction.
  • the lower end surface 51 a on the injection hole side of the outer core portion 51 is in contact with the upper end surface 21 b of the main body portion 21.
  • an outer pressure receiving surface 51b a portion that receives the fuel pressure in the storage chamber 21a
  • a portion of the outer pressure receiving surface 51b that faces the movable core 40 is referred to as an outer facing surface 51c.
  • the lower end surface of the nonmagnetic member 60 is referred to as a nonmagnetic facing surface 60a
  • the lower end surface of the inner core portion 52 is referred to as an inner facing surface 52a.
  • the outer facing surface 51c, the nonmagnetic facing surface 60a, and the inner facing surface 52a face the upper end surface of the movable core 40. Moreover, these opposing surfaces are located on the same plane and are perpendicular to the axial direction.
  • the inner core portion 52 is made of an annular metal that is disposed radially inward with respect to the outer core portion 51 and extends around the axial direction.
  • the inner peripheral surface of the inner core portion 52 functions as a fuel passage 52r.
  • the nonmagnetic member 60 is an annular material disposed between the inner core portion 52 and the outer core portion 51, and is made of a material that is weaker than the outer core portion 51 and the inner core portion 52.
  • the outer core portion 51, the inner core portion 52, the movable core 40, and a lid portion 53 described later are formed of a magnetic material.
  • a cylindrical and metal stopper 54 is fixed to the inner peripheral surface of the inner core portion 52.
  • the lower end surface 54a of the stopper 54 is located closer to the nozzle hole than the inner facing surface 52a in the axial direction. Therefore, when the upper end surface 31a of the engaging portion 31 of the valve body 30 is in contact with the lower end surface 54a of the stopper 54, the inner facing surface 52a, the nonmagnetic facing surface 60a, and the outer facing surface 51c do not contact the movable core 40. In this state, there is a gap G between the upper end surface of the movable core 40.
  • a coil 70 is disposed on the non-magnetic member 60 on the side opposite to the injection hole and on the radially outer side of the inner core portion 52.
  • the coil 70 is wound around a resin bobbin 71.
  • the bobbin 71 has a cylindrical shape centering on the axial direction. Therefore, the coil 70 is disposed in an annular shape extending around the axial direction.
  • the inner peripheral surface of the bobbin 71 is in contact with the inner core portion 52.
  • the opening and the upper end surface on the outer peripheral side of the bobbin are covered with a resin cover 72.
  • the bobbin 71 and the coil 70 are resin-molded by the cover 72.
  • the annular outer peripheral surface of the coil 70 is located radially outside the outer peripheral surface of the movable core 40.
  • the lid portion 53 is made of a metal having magnetism and is formed in an annular shape, and is disposed on the radially outer side of the inner core portion 52 and above the outer core portion 51.
  • the outer peripheral surfaces of the lid portion 53, the outer core portion 51, and the main body portion 21 are in contact with the inner peripheral surface of the case 10 and are accommodated in the case 10.
  • a pipe connection portion 80 that forms a fuel inlet 80a and is connected to an external pipe.
  • the pipe connection portion 80 is made of metal and is formed of a metal member integrated with the inner core portion 52.
  • the fuel pressurized by the high pressure pump is supplied to the fuel injection valve from the inflow port 80a.
  • a press-fitting member 82 is press-fitted and fixed in a press-fitting part 80 b provided in a part of a through hole formed in the pipe connection part 80, and an elastic member 82 s is disposed on the injection hole side of the press-fitting member 82. Yes. One end of the elastic member 82 s contacts the press-fitting member 82, and the other end contacts the engaging portion 31. Therefore, the elasticity of the elastic member 82s when the valve body 30 is opened to the full lift position, that is, when the engaging portion 31 is in contact with the stopper 54, according to the press-fitting amount of the press-fitting member 82, that is, the fixed position in the axial direction. A deformation amount is specified. That is, the valve closing force (set load) by the elastic member 82s is adjusted by the press-fitting amount of the press-fitting member 82.
  • An annular pressing surface 80c that extends perpendicular to the axial direction is formed on the outer peripheral surface of the pipe connecting portion 80.
  • a fastening member 81 is in contact with the pressing surface 80c.
  • the fastening member 81 is fastened to the case 10 by fastening the screw portion 81 n formed on the outer peripheral surface of the fastening member 81 to the screw portion 10 n formed on the inner peripheral surface of the case 10.
  • a force hereinafter referred to as an axial force F10
  • the inner core portion 52, the nonmagnetic member 60, the outer core portion 51, and the main body portion 21 are sandwiched between the bottom surface 10a of the case 10 and the fastening member 81 by the axial force F10.
  • the nozzle body 20 in a state where the injection hole member 23 is welded and the valve body 30 in a state where the nozzle body 20 is inserted into the through hole 41 of the movable core 40 are prepared.
  • the valve body 30 is inserted into the inner peripheral surface 22a of the nozzle body 20, and the movable core 40 is disposed in the storage chamber 21a.
  • the nozzle body 20 with the valve body 30 inserted and arranged in this way is inserted into the outflow side opening 10 b of the case 10.
  • the non-magnetic member 60 is disposed between the inner core portion 52 and the outer core portion 51, the inner core portion 52 and the non-magnetic member 60 are welded and fixed, and the outer core portion 51 and the non-magnetic member are fixed. 60 is fixed by welding. Further, the stopper 54 is fixed to the inner core portion 52 by welding. Thereafter, the bobbin 71 in a state where the coil 70 is wound is inserted and disposed on the outer peripheral surface of the inner core portion 52. Then, the cover 72 is resin-molded so as to cover the coil 70 and the bobbin 71, and the lid portion 53 is inserted and disposed on the outer peripheral surface of the inner core portion 52.
  • the fixed core 50 with the coil 70 and the lid 53 attached in this manner is inserted into the case 10 with the nozzle body 20 attached, and the fastening member 81 is fixed to the case 10 with a predetermined torque.
  • the press-fitting member 82 is press-fitted and fixed to the press-fitting portion 80b while adjusting the press-fitting amount so as to obtain a predetermined set load. To do.
  • the assembly of the fuel injection valve is completed.
  • the high-pressure fuel supplied from the high-pressure pump to the fuel injection valve flows in from the inflow port 80a, flows into the fuel passage 30b of the valve body 30 through the through-hole in the inner core portion 52, and passes from the through-hole 30c to the fuel passage 22b. Inflow.
  • the valve body 30 is opened as described below, the high-pressure fuel in the fuel passage 22b passes between the seat surface 30s and the seating surface 23s and is injected from the injection hole 23a.
  • the accommodating chamber 21 a is filled with high-pressure fuel, and the pressure of the high-pressure fuel acts on the lower end surfaces of the inner core portion 52, the nonmagnetic member 60, and the outer core portion 51.
  • the coil 70 When the valve body 30 is opened, the coil 70 is energized. Then, a magnetic field is generated around the coil 70 as indicated by the dotted arrow in FIG. That is, a magnetic field circuit through which magnetic flux passes through the outer core portion 51, the movable core 40, the inner core portion 52, and the lid portion 53 is formed along with energization. At this time, the nonmagnetic member 60 acts to prevent the outer core portion 51 and the inner core portion 52 from being magnetically short-circuited.
  • an attractive force attracted toward the fixed core 50 acts on the movable core 40. Specifically, an attractive force generated by the magnetic flux M1 passing between the outer core portion 51 and the movable core 40 and an attractive force generated by the magnetic flux M2 passing between the inner core portion 52 and the movable core 40 are generated.
  • valve closing force by the elastic member 82s, the valve closing force by the fuel pressure, and the valve opening force by the suction force described above act on the movable core 40 and the valve body 30. Since the valve opening force is set to be larger than the valve closing force, the movable core 40 moves toward the fixed core 50 together with the valve body 30 when a suction force is generated with energization. . As a result, the valve body 30 opens and contacts the stopper 54 so that the seat surface 30s is separated from the seating surface 23s, and high-pressure fuel is injected from the injection hole 23a.
  • valve body 30 When the valve body 30 is closed, the power supply to the coil 70 is stopped. Then, since the valve opening force due to the suction force described above is lost, the valve element 30 is closed together with the movable core 40 by the valve closing force of the elastic member 82s, and the seat surface 30s is seated on the seating surface 23s. Thereby, the fuel injection from the nozzle hole 23a is stopped.
  • the entire surface of the inner core portion 52 to be joined to the nonmagnetic member 60 is formed in a direction inclined with respect to the annular center line C in a cross section including the annular center line C. This is described as an inner tapered surface 52f. Further, the entire surface of the outer core portion 51 to be joined to the nonmagnetic member 60 is formed as a surface inclined with respect to the annular center line C in the cross section including the annular center line C. The surface is described as an outer tapered surface 51f.
  • the inner tapered surface 52f and the outer tapered surface 51f have a shape that extends annularly around the annular center line C, in other words, a shape that extends annularly around the central axis of the fuel injection valve. Further, the inner tapered surface 52f and the outer tapered surface 51f are inclined in the same direction with respect to the annular center line C. Specifically, the inner tapered surface 52f and the outer tapered surface 51f are inclined in such a direction that the radial dimension becomes smaller toward the nozzle hole side in the axial direction.
  • the above “same direction” does not mean that the angle of the inner tapered surface 52f with respect to the annular center line C is equal to the angle of the outer tapered surface 51f with respect to the annular center line C, and these angles are different from each other. May be.
  • the inner tapered surface 52f and the outer tapered surface 51f are linear.
  • the nonmagnetic member 60 has a cylindrical shape in which the radial dimension decreases as it approaches the nozzle hole side.
  • the length of the inner core portion 52 in the axial direction is longer than the length of the outer core portion 51 in the axial direction.
  • the upper end of the outer core portion 51 is located on the lower side (the nozzle hole side) than the lower end of the coil 70, whereas the upper end of the inner core portion 52 is above the lower end of the coil 70 (on the opposite side). Located on the nozzle hole side). More specifically, the upper end of the inner core portion 52 is positioned above the upper end of the coil 70 (on the side opposite to the injection hole).
  • the upper end position in the axial direction of the outer tapered surface 51f and the upper end position in the axial direction of the inner tapered surface 52f are the same, and the lower end position in the axial direction of the outer tapered surface 51f and the lower end position in the axial direction of the inner tapered surface 52f are the same. It is.
  • the inclination angle of the inner tapered surface 52f with respect to the annular center line C is referred to as an inner inclination angle 52 ⁇
  • the inclination angle of the outer tapered surface 51f with respect to the annular center line C is referred to as an outer inclination angle 51 ⁇ (See FIG. 3).
  • the inner inclination angle 52 ⁇ and the outer inclination angle 51 ⁇ are set to different angles. Specifically, the inner inclination angle 52 ⁇ is set to be smaller than the outer inclination angle 51 ⁇ .
  • the inner core portion 52, the nonmagnetic member 60, the outer core portion 51, and the main body portion are provided between the bottom surface 10 a of the case 10 and the fastening member 81. 21 is sandwiched.
  • a reaction force F30 against the axial force acting on the pressing surface 80c acts on the main body portion 21 from the bottom surface 10a
  • a reaction force F20 equivalent to this reaction force F30 acts on the outer core from the upper end surface 21b of the main body portion 21. It acts on the lower end surface 51 a of the part 51.
  • the fastening member 81 corresponds to a restricting member that restricts the fixed core 50 from moving to the counter injection hole side under the pressure of the fuel. Further, the fastening member 81 corresponds to an inner imparting portion that imparts an axial force F10 in the axial direction to the inner core portion 52, and imparts an axial force F10 in a direction in which the inner core portion 52 is pressed against the movable core 40 side.
  • the main body portion 21 of the nozzle body 20 corresponds to an outer imparting portion that imparts a reaction force F20 against the axial force F10 to the outer core portion 51, and imparts a reaction force F30 in a direction in which the outer core portion 51 is pressed against the opposite side of the movable core 40. To do.
  • the radial position at which the axial force F10 acts is the radial direction at which the reaction force F20 acts. Since it is inside the position, a shear stress is generated inside the fixed core 50. Therefore, a shearing force acts on the joint surfaces of the inner core portion 52 and the outer core portion 51 and the nonmagnetic member 60, thereby causing a concern that welding at the joint surfaces is damaged.
  • the inner tapered surface 52f and the outer tapered surface 51f are inclined so as to sandwich the nonmagnetic member 60 by the axial force F10 and the reaction force F20.
  • the inner tapered surface 52f and the outer tapered surface 51f are inclined in the direction in which the force of the compression components F11a and F21a shown in FIG. 4 is generated.
  • the surface of the nonmagnetic member 60 that contacts the outer core portion 51 receives the reaction force F20 in the compression direction
  • the surface of the nonmagnetic member 60 that contacts the inner core portion 52 receives the axial force F10 in the compression direction. It is tilted.
  • the force F21 transmitted to the outer tapered surface 51f is divided into a compression component F21a perpendicular to the outer tapered surface 51f and a shear component F21b parallel to the outer tapered surface 51f.
  • the force F11 transmitted to the inner tapered surface 52f is divided into a compression component F11a perpendicular to the inner tapered surface 52f and a shear component F11b parallel to the inner tapered surface 52f.
  • the directions of the compression components F21a and F11a do not coincide with each other, and the directions of the shear components F21b and F11b do not coincide with each other.
  • the inner core portion 52 and the outer core portion 51 In a state where the inner core portion 52 and the outer core portion 51 are not receiving fuel pressure from the movable core 40 side, for example, when the fuel injection valve is not used, the inner core portion 52 and the outer core portion 51 have the axial force F10 and It is in a state of being elastically deformed by the reaction force F20. That is, the fixed core 50 is bent by screwing the fastening member 81 into the screw portion 10n with a predetermined torque.
  • the pressure received from the high pressure fuel in the storage chamber 21a is applied to the fixed core 50, thereby reducing the amount of elastic deformation due to the prestress.
  • the outer pressure receiving surface 51b of the outer core portion 51, the inner facing surface 52a of the inner core portion 52, the nonmagnetic facing surface 60a of the nonmagnetic member 60, and the lower end surface 54a of the stopper 54 receive the pressure of high pressure fuel.
  • the force that the inner core portion 52 receives on the side opposite to the injection hole due to the fuel pressure applied to the inner facing surface 52a and the lower end surface 54a is referred to as an inner fuel pressure push-up force.
  • the force F11 applied to the inner tapered surface 52f is reduced by the amount corresponding to the inner fuel pressure lifting force. Accordingly, the reaction force F20 applied to the lower end surface 51a is also reduced, and the reaction force F21 transmitted to the outer tapered surface 51f of the reaction force F20 is also reduced.
  • the tightening torque of the fastening member 81 is set so that the force F11 caused by the axial force F10 applied to the inner tapered surface 52f does not become smaller than the inner fuel pressure.
  • the pre-stress is applied to the fixed core 50 in advance. It is suppressed that the position is shifted by being pushed up to the upper side (reverse injection hole side). Furthermore, it can suppress that the levelness of the surface which opposes the movable core 40 among fixed cores reduces by the deformation
  • an inner core portion 52 and an outer core portion 51 are provided in a portion of the fixed core 50 facing the movable core 40, and a nonmagnetic member 60 is disposed therebetween. Therefore, the non-magnetic member 60 prevents the inner core portion 52 and the outer core portion 51 from being magnetically short-circuited with each other. As a result, both the attractive force generated by the magnetic flux M1 passing between the outer core portion 51 and the movable core 40 and the attractive force generated by the magnetic flux M2 passing between the inner core portion 52 and the movable core 40 are both movable core 40. To act on.
  • the attracting force is applied by the magnetic fluxes M1 and M2 as described above, the attracting force to the movable core 40 can be improved, but the radial dimensions of the movable core 40 and the fixed core 50 need to be increased.
  • the radial dimension of the fixed core 50 is increased, the fixed core 50 and the nonmagnetic member 60 are joined together because the pressure receiving area of the pressure that the fixed core 50 receives in the axial direction from the fuel in the storage chamber 21a increases. There is concern about the face being damaged.
  • the fastening member 81 that applies the axial force F10 in the axial direction to the inner core portion 52 and the main body portion 21 that applies the reaction force F20 to the axial force F10 to the outer core portion 51 are provided.
  • the fixed core 50 is not receiving fuel pressure from the movable core 40 side, the fixed core 50 is elastically deformed by the axial force F10 and the reaction force F20. Therefore, as described above, it is possible to suppress the damage of the joint surface due to the internal fuel pressure push-up force due to the prestress applied in advance to the fixed core 50.
  • a force directed radially outward from the inner core portion 52 is applied to the inner tapered surface 52f, and radially outward from the outer core portion 51 to the outer tapered surface 51f.
  • the power to aim is added. That is, the nonmagnetic member 60 is sandwiched between the inner core portion 52 and the outer core portion 51 by prestress. Therefore, it is possible to suppress the fuel in the storage chamber 21a from entering the joint surface between the outer core portion 51 and the inner core portion 52 and the nonmagnetic member 60 due to the high fuel pressure in the storage chamber 21a. Therefore, damage to the joint surface due to the entry of high-pressure fuel into the joint surface can be suppressed.
  • the inner fuel pressure push-up force acts on the inner core portion 52, so that the end portion on the injection hole side of the inner core portion 52 ( Hereinafter, the inner core end portion) may be deformed (diameter-reduced deformation) to reduce the diameter.
  • prestress is applied, as described above, a force directed radially outward from the inner core portion 52 is applied to the inner tapered surface 52f, and as a result, diameter-reducing deformation can be suppressed. .
  • the joint surface of the inner core portion 52 with the nonmagnetic member 60 is tapered and the outer core portion 51 is nonmagnetic.
  • the joint surface with the member 60 is tapered.
  • These joint surfaces, that is, the inner tapered surface 52f and the outer tapered surface 51f are inclined in the same direction with respect to the annular center line C.
  • the nonmagnetic member is caused by the axial force F10 and the reaction force F20. It inclines in the direction which clamps 60.
  • the inner core portion 52 and the outer core portion 51 are provided in the portion of the fixed core 50 that faces the movable core 40, and the nonmagnetic member 60 is disposed between them, thereby providing both magnetic fluxes M1. , M2 can be used to improve the suction force.
  • the fastening member 81 for applying the axial force F10 and the main body portion 21 for applying the reaction force F20 are provided, and the fixed core 50 is elastically deformed by the axial force F10 and the reaction force F20 when not receiving the fuel pressure. . Therefore, in the state which received the fuel pressure, it can suppress with a prestress that a joint surface is damaged with an internal fuel pressure pushing-up force.
  • the inner tapered surface 52f and the outer tapered surface 51f are inclined in the same direction and in the direction in which the nonmagnetic member 60 is sandwiched by the axial force F10 and the reaction force F20. Therefore, since the shearing force applied to the inner tapered surface 52f and the outer tapered surface 51f can be reduced when the axial force F10 is applied to generate the prestress, it is possible to suppress the concern that the joint surface is damaged. Therefore, it is possible to achieve both improvement in attractive force and suppression of breakage of the joint surface between the fixed core 50 and the nonmagnetic member 60.
  • the fixed core has an inner core portion located radially inside and an outer core portion located radially outside, and the inner core portion, the nonmagnetic member, and the outer core portion are opposed to the movable core.
  • the joint surface between the inner core portion and the nonmagnetic member is inclined, and the joint surface between the outer core portion and the nonmagnetic member is also inclined.
  • these two joint surfaces are not inclined in the same direction with respect to the annular center line, but are inclined in different directions.
  • the inner circumferential surface of the nonmagnetic member 60 having an annular shape (hereinafter referred to as an inner joint surface) has a larger radial dimension as it approaches the nozzle hole side, and the outer circumferential surface of the nonmagnetic member 60 ( Hereinafter, the outer joint surface) is a shape in which the radial dimension decreases as it approaches the nozzle hole side.
  • the strength countermeasure against the pressure of the fuel (hereinafter referred to as push-up fuel pressure) from the nozzle hole side to the fixed core and the nonmagnetic member is not sufficient, and has the following problems. That is, the outer core portion is restrained from the counter-injection hole side to the injection hole side by the axial force of the screw-tightening regulating member, so that it moves to the anti-injection hole side (upward) even if it receives boost fuel pressure.
  • the inner core portion and the nonmagnetic member are not structured to be restrained by the axial force of the regulating member or the like, but are structured to withstand the boost fuel pressure with the joining force at the joining surface. Therefore, there exists a subject that a joint surface will be damaged if the pushing-up fuel pressure concerning an inner core part and a nonmagnetic member is large.
  • the inner joint surface has a shape in which the radial dimension increases as it approaches the nozzle hole side
  • the outer joint surface has a shape in which the radial dimension decreases as it approaches the nozzle hole side. is there. Therefore, when a large push-up fuel pressure is applied to the inner core portion and the non-magnetic member, the outer joint surface receives a force in the direction in which the non-magnetic member is pulled upward from the outer core portion. A force is applied in a direction in which the nonmagnetic member is pressed upward on the part. Therefore, there is a problem that the outer joint surface is damaged and the inner core portion and the nonmagnetic member come out upward.
  • the inner core portion is also restrained from the anti-injection hole side to the injection hole side by a screw-tightening restricting member or the like in the same manner as the outer core portion, that is, a structure that imparts axial force (hereinafter, improved)
  • a structure that imparts axial force hereinafter, improved
  • both the inner joint surface and the outer joint surface are damaged, and the nonmagnetic member is pulled out upward, or the inner joint surface is damaged and the inner core portion is There arises a new problem of falling out.
  • the outer joint surface receives a force in the direction in which the nonmagnetic member is pulled upward from the outer core portion in the same manner as in the conventional structure.
  • the inner joint surface receives a force in a direction in which the nonmagnetic member is pulled upward from the inner core portion. Therefore, when a large push-up fuel pressure is applied, although the outer core portion and the inner core portion are suppressed by the regulating member, the following problem newly arises.
  • the nonmagnetic member has a structure that can withstand the fuel pressure by the joining force at the inner and outer joint surfaces, so that both joint surfaces are damaged and the nonmagnetic member is pulled upward.
  • the inner joint surface receives a force in the direction in which the inner core portion is pulled downward from the non-magnetic member. Escapes downward.
  • the problems caused by the conventional structure and the improved structure are solved as follows by the configuration adopted by the present embodiment. That is, in this embodiment, the axial force F10 is applied to the inner core portion 52, the inner tapered surface 52f and the outer tapered surface 51f are in the same direction, and the nonmagnetic member 60 is sandwiched by the axial force F10 and the reaction force F20. It is inclined to. According to this configuration, when the fixed core 50 and the nonmagnetic member 60 receive the boost fuel pressure, a force directed radially outward from the inner core portion 52 is applied to the inner tapered surface 52f. Further, a force directed radially inward from the outer core portion 51 is applied to the outer tapered surface 51f.
  • the nonmagnetic member 60 is sandwiched between the inner core portion 52 and the outer core portion 51. Therefore, it is possible to reduce the concern that the joint surface (inner joint surface) between the inner core portion 52 and the nonmagnetic member 60 and the joint surface (outer joint surface) between the outer core portion 51 and the nonmagnetic member 60 are damaged.
  • the axial force F10 is applied in the direction in which the inner core portion 52 is pressed toward the movable core 40
  • the reaction force F20 is applied in the direction in which the outer core portion 51 is pressed toward the opposite side of the movable core 40.
  • the outer applying portion is located on the outer peripheral side of the movable core 40. Then, it becomes difficult to sufficiently secure the radial dimension of the movable core 40, and there is a concern that it becomes difficult to secure a large suction surface facing the outer core portion 51 of the movable core 40.
  • the inner tapered surface 52f and the outer tapered surface 51f are inclined in such a direction that the radial dimension becomes smaller as the movable core 40 is approached. Therefore, it becomes easy to ensure a large suction surface facing the outer core portion 51 in the movable core 40.
  • the annular outer peripheral surface of the coil 70 is located on the radially outer side than the outer peripheral surface of the movable core 40.
  • the inner tapered surface 52f and the outer tapered surface 51f are inclined in such a direction that the radial dimension becomes smaller as the movable core 40 is approached. The area of the opposing part can be increased.
  • the inclination angle 51 ⁇ of the outer tapered surface 51f with respect to the annular center line C is set larger than the inclination angle 52 ⁇ of the inner tapered surface 52f with respect to the annular center line C. Yes. Therefore, since the area of the part facing the outer facing surface 51c in the outer core part 51 can be increased, the passage area of the magnetic flux M1 passing between the outer core part 51 and the movable core 40 can be easily ensured.
  • a stopper 54 is provided that is fixed to the inner core portion 52 and regulates the amount of movement of the valve body 30 in the valve opening direction by contacting the valve body 30, and the axial length of the inner core portion 52 is provided. Is set longer than the axial length of the outer core portion 51. Therefore, the bending rigidity of the inner core portion 52 with respect to the inner fuel pressure push-up force is increased by the amount that the axial length of the inner core portion 52 is longer than the axial length of the outer core portion 51. Therefore, the amount of deformation in the axial direction of the inner core portion 52 caused by the pre-stress can be reduced, and the amount of deformation in the axial direction of the inner core portion 52 caused by the inner fuel pressure pushing force is also reduced. Therefore, the positional accuracy of the stopper in the axial direction can be improved, and as a result, the accuracy of the gap G between the fixed core 50 and the movable core 40 in the valve open state can be improved.
  • the inner tapered surface 52f and the outer tapered surface 51f have a shape that extends annularly around the annular center line C. Therefore, compared with the case where a tapered surface is partially formed in the circumferential direction, the above-described effect that the shearing force applied to the inner tapered surface 52f and the outer tapered surface 51f can be reduced is further exhibited.
  • the inner tapered surface 52f and the outer tapered surface 51f are formed on the entire surface to be joined to the nonmagnetic member 60 in the cross section including the annular center line C. Therefore, compared with the case where a part of the joint surface is partially tapered in the cross section, the above-described effect that the shearing force applied to the inner tapered surface 52f and the outer tapered surface 51f can be reduced is further exhibited. become.
  • the outer tapered surface 51f is formed on the entire surface to be joined to the nonmagnetic member 60 in the cross section including the annular center line C.
  • the outer tapered surface 51 f is formed on a part of the surface joined to the nonmagnetic member 60 in the cross section including the annular center line C.
  • the outer tapered surface 51 f is formed at a position continuous from the outer pressure receiving surface 51 b of the outer core portion 51.
  • the joint surface 51fa of the position which continues from the upper end surface of the outer core part 51 is a shape extended in parallel with an axial direction, and is a shape which is not inclined with respect to an axial direction.
  • the first embodiment is modified to partially form the outer tapered surface 51f.
  • the inner tapered surface 52f may be partially formed in the same manner.
  • the outer tapered surface 51f is formed on a part of the surface joined to the nonmagnetic member 60, and the outer tapered surface 51f is continuous from the outer pressure receiving surface 51b. It is formed at the position.
  • the outer tapered surface 51 f is formed on a part of the surface joined to the nonmagnetic member 60 in the cross section including the annular center line C.
  • the outer taper surface 51f is formed in the position of the intermediate part of an axial direction among joining surfaces.
  • the joint surface 51fa at a position continuous from the upper end surface of the outer core portion 51 and the joint surface 51fb at a position continuous from the outer pressure receiving surface 51b have a shape extending in parallel to the axial direction and are inclined with respect to the axial direction. It is not a shape.
  • the first embodiment is modified so that the outer tapered surface 51f is formed in the intermediate portion.
  • the inner tapered surface 52f may be formed in the intermediate portion in the same manner.
  • the joint surface between the fixed core 50 and the nonmagnetic member 60 is formed in a tapered shape in the cross section including the annular center line C.
  • the joint surface is formed in a stepped shape described below.
  • At least part of the surface of the inner core portion 52 that is joined to the nonmagnetic member 60 has an inner intersecting surface 52g that is a surface that intersects the axial direction in the cross section including the annular center line C. Is formed.
  • an outer intersecting surface 51g that is a surface that intersects the axial direction in a cross section including the annular center line C is formed on at least a part of the surface of the outer core portion 51 that is joined to the nonmagnetic member 60.
  • the inner intersecting surface 52g and the outer intersecting surface 51g are stepped shapes extending perpendicularly to the annular center line C. Hereinafter, the step shape will be described in detail.
  • the joint surface of the outer core portion 51 with the nonmagnetic member 60 has an upper joint surface 51ga, a lower joint surface 51gb, and an outer intersecting surface 51g described below.
  • the upper joint surface 51ga is at a position continuing from the upper end surface of the outer core portion 51
  • the lower joint surface 51gb is at a position continuing from the outer pressure receiving surface 51b.
  • the upper joint surface 51ga and the lower joint surface 51gb have shapes extending in parallel to the axial direction.
  • the outer intersecting surface 51g is located at a position continuous to the upper joint surface 51ga and the lower joint surface 51gb, and has a shape that intersects perpendicularly to the axial direction.
  • the joint surface of the inner core portion 52 with the nonmagnetic member 60 has an upper joint surface 52ga, a lower joint surface 52gb, and an inner intersecting surface 52g described below.
  • the upper bonding surface 52ga is at a position continuous from the upper end surface of the nonmagnetic member 60
  • the lower bonding surface 52gb is at a position continuous from the inner facing surface 52a.
  • the upper joint surface 52ga and the lower joint surface 52gb have shapes extending in parallel to the axial direction.
  • the inner intersecting surface 52g is located at a position continuous with the upper joint surface 52ga and the lower joint surface 52gb, and has a shape that intersects perpendicularly to the axial direction.
  • the step shape formed by the inner intersection surface 52g and the outer intersection surface 51g is a shape in which the nonmagnetic member 60 is sandwiched by the axial force F10 and the reaction force F20. That is, the inner intersecting surface 52g extends in a direction to receive the axial force F10 from the fastening member 81, and the outer intersecting surface 51g extends in a direction to receive the reaction force F20 from the main body portion 21, whereby the nonmagnetic member 60 is It is pinched.
  • the step shape formed by the inner intersecting surface 52g and the outer intersecting surface 51g is a shape in which the nonmagnetic member 60 is sandwiched by the axial force F10 and the reaction force F20. Therefore, when the fastening member 81 is screwed into the threaded portion 10n and prestress is applied, the axial force F11 transmitted to the inner tapered surface 52f among the axial force F10 due to the screwing force is the inner intersecting surface 52g and the outer intersecting surface 51g. Take it vertically.
  • the axial force F11 is applied as a compressive force of the nonmagnetic member 60 and the outer core portion 51, almost no shearing force is applied to the upper joint surface 51ga and the lower joint surface 51gb. Similarly, almost no shear force is applied to the upper joint surface 52ga and the lower joint surface 52gb. Therefore, it is possible to suppress the concern that the joint surface is damaged by the axial force F10 that causes prestress.
  • the inner intersecting surface 52g and the outer intersecting surface 51g have a shape extending annularly around the annular center line C. Therefore, compared with the case where the step shape is partially formed in the circumferential direction, the above-described effect that the shearing force applied to the upper joint surface 51ga, the lower joint surface 51gb, the upper joint surface 52ga, and the lower joint surface 52gb can be reduced. , Will be even more effective.
  • both the joint surface of the inner core portion 52 and the joint surface of the outer core portion 51 are formed in a stepped shape.
  • the joint surface of the inner core portion 52 is formed in a step shape, and the joint surface of the outer core portion 51 is tapered similarly to the first embodiment. Is formed.
  • the inner tapered surface 52f and the outer tapered surface 51f that are inclined in the same direction are inclined in such a direction that the radial dimension becomes smaller as they approach the nozzle hole side in the axial direction (see FIG. 1).
  • the direction of the inclination is reversed (see FIG. 9). The technical significance will be described below.
  • the force of the fuel pressure applied to the fixed core 50 is received by the pre-stress by the axial force F10 and the fastening member 81.
  • a part of the axial force F11 is dispersed as a compression component on both tapered surfaces to reduce the shear component applied to the joint surface.
  • both tapered surfaces are inclined so that the radial dimension becomes smaller as the nozzle hole side is approached.
  • both tapered surfaces are inclined in a direction opposite to that in FIG. 1, that is, in a direction in which the radial dimension becomes smaller toward the nozzle hole side (see FIG. 9).
  • the fastening member 81 is screwed into the case 10 to generate the axial force F10, and the nonmagnetic member 60 is sandwiched between the tapered surfaces by the axial force F10.
  • the fastening member 81 and the case 10 are abolished, the fastening member 810 is fastened to the nozzle body 20, and the nonmagnetic member 60 is sandwiched between both tapered surfaces by the axial force.
  • the fastening member 810 has a cylindrical shape, and is fastened by fastening a screw portion 810n formed on the inner peripheral surface of the fastening member 810 to a screw portion 21n formed on the outer peripheral surface of the main body portion 21.
  • the member 810 is fastened to the nozzle body 20.
  • a pressing surface 510c with which the fastening member 810 abuts is formed on the surface of the outer core portion 510 on the side opposite to the injection hole.
  • the pressing surface 510c is located on the outer side in the radial direction from the lid portion 53, and is formed in an annular shape that extends perpendicular to the axial direction.
  • the axial force generated by screwing the fastening member 810 acts on the pressing surface 510c.
  • a reaction force against the axial force acts on the outer core portion 510 from the upper end surface 21 b of the main body portion 21. Accordingly, the outer core portion 510 is sandwiched between the main body portion 21 and the fastening member 810 and is restricted from moving toward the anti-injection hole in the axial direction.
  • a reaction force against the inner fuel pressure lifting force acts on the pressing surface 510c from the fastening member 810. That is, the inner fuel pressure pushing force is transmitted to the fastening member 810 through the inner tapered surface 520f, the nonmagnetic member 60, the outer tapered surface 510f, and the pressing surface 510c.
  • the force transmitted to the inner taper surface 520f of the inner fuel pressure push-up force is divided into a compression component perpendicular to the inner taper surface 520f and a shear component parallel to the inner taper surface 520f.
  • the force transmitted to the outer tapered surface 510f is a compression component perpendicular to the outer tapered surface 510f and parallel to the outer tapered surface 510f. Divided into shear components.
  • the core portion having a large pressure receiving surface that receives fuel pressure from the movable core 40 side is the inner core portion 520
  • the inner core portion 520 is the large pressure receiving core.
  • the outer core portion 510 corresponds to a small pressure receiving core portion.
  • the fastening member 810 corresponds to a restricting member that restricts the fixed core 50 from moving toward the counter-injection hole under the pressure of the fuel, and against the force (inner fuel pressure push-up force) received by the large pressure receiving core portion from the pressure receiving surface. It corresponds to an outer side imparting portion that imparts a reaction force to the small pressure receiving core portion.
  • the inner tapered surface 520f and the outer tapered surface 510f are inclined in a direction to sandwich the nonmagnetic member 60 by a force (inner fuel pressure pushing force) received by the large pressure receiving core portion from the pressure receiving surface and a reaction force from the fastening member 810. ing.
  • both tapered surfaces are inclined in such a direction that the radial dimension becomes smaller as it approaches the nozzle hole side.
  • the joint surface of the inner core portion 52 with the nonmagnetic member 60 is tapered, and the joint surface of the outer core portion 51 with the nonmagnetic member 60 is tapered.
  • These joint surfaces that is, the inner tapered surface 520f and the outer tapered surface 510f are inclined in the same direction with respect to the annular center line C. Specifically, the inner fuel pressure push-up force and the reaction force from the fastening member 810 are inclined.
  • the nonmagnetic member 60 is tilted in a direction to sandwich the nonmagnetic member 60 by force.
  • the lifting force is dispersed in the compression component and the shear component, and the shear component is reduced by the amount of the compression component.
  • the reaction force transmitted to the outer tapered surface 510f is dispersed into the compression component and the shear component, and the shear component is reduced by the amount of the compression component. Therefore, since the shear force applied to the inner tapered surface 520f and the outer tapered surface 510f can be reduced, it is possible to suppress the concern that the joint surface is damaged by the inner fuel pressure pushing force.
  • the fixed core 50 and the nonmagnetic member 60 are separate bodies, and the nonmagnetic member 60 is sandwiched between the outer core portion 51 and the inner core portion 52.
  • the nonmagnetic member is formed integrally with the outer core portion 511. Specifically, a predetermined region including a surface facing the inner core portion 52 in the outer core portion 511 that is a magnetic material is subjected to a demagnetization process or the like to be changed into a non-magnetic material. A portion of the outer core portion 511 corresponding to the predetermined region and indicated by a halftone dot in FIG. 10 is referred to as a nonmagnetic portion 511h.
  • the shape of the nonmagnetic part 511h is the same as that of the nonmagnetic member 60 shown in FIG. That is, the shape of the boundary 511ha between the nonmagnetic portion 511h and the magnetic body portion of the outer core portion 511 is the same as the outer tapered surface 51f shown in FIG.
  • the outer tapered surface 511f which is the surface facing the inner core portion 52 of the outer core portion 511, has the same shape as the inner tapered surface 52f shown in FIG. 1, and the outer tapered surface 511f and the inner tapered surface 52f. And are joined by welding.
  • the same effect as that of the first embodiment is exhibited. That is, the inner core portion 52 and the outer core portion 511 are provided in a portion of the fixed core 50 that faces the movable core 40, and the nonmagnetic portion 511h is positioned therebetween, thereby using both magnetic fluxes M1 and M2.
  • the suction power can be improved.
  • the fixed core 50 is elastically deformed by the axial force and the reaction force to generate the pre-stress. Therefore, in a state where the fuel pressure is received, it is possible to suppress the damage of the joint surface between the outer tapered surface 511f and the inner tapered surface 52f due to the inner fuel pressure push-up force by the prestress.
  • the inner tapered surface 52f and the outer tapered surface 511f are inclined in the same direction and in a direction in which the nonmagnetic portion 511h is sandwiched by prestress. Therefore, since the shearing force applied to the inner tapered surface 52f and the outer tapered surface 511f can be reduced in generating prestress, it is possible to suppress the concern that the joint surface is damaged. Therefore, it is possible to achieve both improvement in attractive force and suppression of breakage of the joint surface between the fixed core 50 and the nonmagnetic portion 511h.
  • the nonmagnetic member is formed integrally with the outer core portion 511.
  • the nonmagnetic member is formed integrally with the inner core portion 521.
  • a predetermined region including a surface facing the outer core portion 51 of the inner core portion 521 that is a magnetic material is transformed into a non-magnetic material by performing a demagnetization process or the like.
  • a portion of the inner core portion 521 that is a portion of the predetermined region and that has a halftone dot in FIG. 11 is referred to as a nonmagnetic portion 521h.
  • the shape of the nonmagnetic part 521h is the same as that of the nonmagnetic member 60 shown in FIG. That is, the shape of the boundary 521ha between the nonmagnetic portion 521h and the magnetic body portion in the inner core portion 521 is the same as the inner tapered surface 52f shown in FIG.
  • the shape of the inner tapered surface 521f which is the surface facing the outer core portion 51 of the inner core portion 521, is the same as the shape of the outer tapered surface 51f shown in FIG. 1, and the inner tapered surface 521f and the outer tapered surface 51f. And are joined by welding.
  • the same effect as that of the seventh embodiment is exhibited. That is, the inner core portion 521 and the outer core portion 51 are provided in a portion of the fixed core 50 that faces the movable core 40, and the nonmagnetic portion 521h is positioned therebetween, thereby using both magnetic fluxes M1 and M2.
  • the suction power can be improved.
  • the fixed core 50 is elastically deformed by the axial force and the reaction force to generate the pre-stress. For this reason, in a state where the fuel pressure is received, it is possible to suppress the joint surface between the outer tapered surface 51f and the inner tapered surface 521f from being damaged by the inner fuel pressure push-up force due to the prestress.
  • the inner tapered surface 521f and the outer tapered surface 51f are inclined in a direction in which the axial force for pre-stress is dispersed in the compression component. Therefore, since the shearing force applied to the inner tapered surface 521f and the outer tapered surface 51f can be reduced when generating the prestress, it is possible to suppress the concern that the joint surface is damaged. Therefore, it is possible to achieve both improvement in attractive force and suppression of damage to the joint surface between the fixed core 50 and the nonmagnetic portion 521h.
  • a part of the outer tapered surface 51f and a part of the inner tapered surface 52f are integrated with the nonmagnetic member 60 by welding.
  • a portion of the outer core portion 51 that is fused and integrated with the nonmagnetic member 60 by welding is referred to as an outer melting portion 51w, and a portion of the inner core portion 52 that is fused and integrated with the nonmagnetic member 60 by welding.
  • the outer melting portion 51w and the inner melting portion 52w are located on the end surface of the nonmagnetic member 60 on the movable core 40 side in the axial direction.
  • the boundary between the outer core portion 51 and the nonmagnetic member 60 may disappear by welding to form the outer melted portion 51w.
  • the position where the outer tapered surface 51f was present before welding in the outer melted portion 51w is virtually called an outer tapered surface 51f.
  • the position where the inner tapered surface 52f exists in the inner melting portion 52w before welding is virtually referred to as an inner tapered surface 52f.
  • the present inventors performed the following fracture tests for each of the outer melting portion 51w and the inner melting portion 52w.
  • melting part 51w either the outer side core part 51 or the nonmagnetic member 60 is fixed, and an axial load is provided to the other. Then, the axial load is gradually increased, and the axial load (weld breaking load) when the outer melted portion 51w breaks is measured.
  • a plurality of samples of the outer core portion 51 and the nonmagnetic member 60 having different outer inclination angles 51 ⁇ are prepared, and the respective weld fracture loads are measured.
  • the inner melted portion 52w a plurality of samples of the inner core portion 52 and the nonmagnetic member 60 having different inner inclination angles 52 ⁇ are prepared, and the respective weld fracture loads are measured.
  • the breaking load is remarkably reduced.
  • the outer inclination angle 51 ⁇ and the inner inclination angle 52 ⁇ are set to 10 degrees or more.
  • the inclination angle is not less than 10 degrees and less than 20 degrees, preferably not less than 10 degrees and 15 degrees. It is desirable to set it to less than degrees.
  • the outer inclination angle 51 ⁇ and the inner inclination angle 52 ⁇ are set to 10 degrees or more, the welding fracture load can be increased, and the outer melting portion 51w and the inner melting portion 52w are broken by the axial force. The fear can be suppressed.
  • the surface roughness of a portion of the outer tapered surface 51f where the outer melted portion 51w is not formed, that is, a portion (contact portion) that is not integrated with the nonmagnetic member 60 is referred to as Rz1a.
  • the surface roughness of the part (contacted part) which contacts the contact part of the outer taper surface 51f among the nonmagnetic members 60 is called Rz1b.
  • the surface roughness of the inner tapered surface 52f where the inner melted portion 52w is not formed (contact portion) is referred to as Rz2a.
  • the surface roughness of the part (contacted part) which contacts the contact part of the inner taper surface 52f among the nonmagnetic members 60 is called Rz2b.
  • the sum of Rz1a and Rz1b is called an outer surface roughness sum Rz1
  • the sum of Rz2a and Rz2b is called an inner surface roughness sum Rz2.
  • the inventors perform the same fracture test as in FIG. 13 for each of the outer melting portion 51w and the inner melting portion 52w, and prepare a plurality of samples having different outer surface roughness sum Rz1 and inner surface roughness sum Rz2. Then, each welding fracture load was measured.
  • the surface roughness is digitized using an index defined by the 10-point average roughness, but the center line average roughness has a correlation with the 10-point average roughness, and the value of the 10-point average roughness. The value obtained by multiplying 0.25 by 0.25 corresponds to the centerline average roughness.
  • the 10-point average roughness is the difference between the average elevation of the peak from the highest peak to the fifth in the range of the reference length from the cross-section curve and the average elevation of the lowest valley from the lowest to the fifth. is there.
  • the third elevation from the highest peak and the third elevation from the lowest valley bottom may be the average elevation.
  • the centerline average roughness is the average value of the convex and concave heights from the centerline, and is the value obtained by dividing the total area enclosed by the centerline and the section curve of the section curve by the reference length of the section curve. is there.
  • the breaking load increases as the surface roughness sum increases. Specifically, in the region where the surface roughness sum is less than 20 ⁇ m, the welding fracture load increases in proportion to the surface roughness sum. However, in the region where the surface roughness sum is 20 ⁇ m or more, the welding fracture load is smaller than the value proportional to the surface roughness sum as shown by the dotted line Lb in the figure.
  • the breaking load is remarkably reduced.
  • the outer surface roughness sum Rz1 and the inner surface roughness sum Rz2 are set to 20 ⁇ m or more.
  • the surface roughness sum is not less than 20 ⁇ m. It is desirable to set it to less than 30 ⁇ m, preferably 20 ⁇ m or more and less than 25 ⁇ m.
  • the present inventors have confirmed that the characteristic line shown by the solid line in FIG. 14 deviates from the straight line Lb at 20 ⁇ m or more when the inclination angle is 10 degrees or more. Further, when the surface roughness sum is 20 ⁇ m or more, it is confirmed that the characteristic line shown by the solid line in FIG. 13 deviates from the straight line La by 10 degrees or more.
  • the outer surface roughness sum Rz1 and the inner surface roughness sum Rz2 are set to 20 ⁇ m or more for the 10-point average roughness, and to 5 ⁇ m or more for the center line average roughness. Therefore, the welding break load can be increased, and the possibility that the outer melting portion 51w and the inner melting portion 52w are broken by the axial force can be suppressed.
  • the fixed core 50 and the nonmagnetic member 60 are welded together, and a part of the outer tapered surface 51 f and a part of the inner tapered surface 52 f are integrated with the nonmagnetic member 60.
  • the fixed core 50 and the nonmagnetic member 60 are brazed to each other, and the entire outer tapered surface 51f and the entire inner tapered surface 52f are integrated with the nonmagnetic member 60.
  • the brazing material interposed between the outer tapered surface 51f and the nonmagnetic member 60 is called the outer brazing material 51br
  • the brazing material interposed between the inner tapered surface 52f and the nonmagnetic member 60 is the inner brazing. This is called material 52br.
  • the outer tapered surface 51f and the inner tapered surface 52f are not in direct contact with the nonmagnetic member 60, and a brazing material is interposed between the tapered surface and the nonmagnetic member 60.
  • a brazing material is interposed between the tapered surface and the nonmagnetic member 60.
  • the state where the brazing material is joined and joined is also included in the “joining”.
  • the entire surface of the outer tapered surface 51f and the entire surface of the inner tapered surface 52f are integrated with the nonmagnetic member 60. Therefore, compared to the case of partial integration, bonding by axial force is performed. The risk of surface breakage can be reduced. Further, when the entire surface of the tapered surface is integrated with the nonmagnetic member 60, the welding depth from the end surface of the nonmagnetic member 60 becomes longer if the entire surface is integrated by laser welding contrary to this embodiment. Therefore, an increase in laser output is required, and the entire surface welding is difficult, for example, the welding width becomes larger than necessary. In contrast, in the present embodiment, since the entire surface is integrated by brazing, the entire surface integration can be easily realized as compared with laser welding.
  • a groove 51fc extending in the circumferential direction is formed on the outer tapered surface 51f.
  • a groove 52 fc extending in the circumferential direction is formed on the inner tapered surface 52 f for the inner core portion 52.
  • the groove 51fc is formed by rotating the outer core portion 51 around the annular center line C as indicated by an arrow in the drawing and pressing a cutting tool against the rotating outer tapered surface 51f.
  • the groove 52fc is formed by pressing a cutting tool against the rotating inner tapered surface 52f.
  • the surfaces of the outer tapered surface 51f and the inner tapered surface 52f are cut a plurality of times so as to gradually reduce the surface roughness. After that, by performing cutting to increase the surface roughness, grooves 51fc and 52fc are formed on the surfaces of the outer tapered surface 51f and the inner tapered surface 52f. Note that the grooves 51fc and 52fc may be formed in the process of gradually reducing the surface roughness by eliminating the above-described cutting process that finally increases the surface roughness.
  • the outer tapered surface 51f is formed with a groove 51fc extending in the circumferential direction. Therefore, the friction coefficient with respect to the axial direction of the outer peripheral surface 601f of the nonmagnetic member 60 and the outer tapered surface 51f can be increased. Therefore, the possibility that the outer melted part 51w is broken by the axial force can be suppressed.
  • the inner tapered surface 52f is similarly formed with a groove 52fc extending in the circumferential direction. Therefore, the friction coefficient with respect to the axial direction of the inner peripheral surface 602f of the nonmagnetic member 60 and the inner tapered surface 52f can be increased. Therefore, the possibility that the inner melting portion 52w is broken by the axial force can be suppressed.
  • an outer press-fit surface 51pi into which the non-magnetic member 60 is press-fitted is formed on the surface of the outer core portion 51 that is joined to the non-magnetic member 60.
  • an inner press-fit surface 52pi into which the non-magnetic member 60 is press-fitted is formed on a surface of the inner core portion 52 that is joined to the non-magnetic member 60.
  • the outer tapered surface 51f and the inner tapered surface 52f are inclined with respect to the axial direction, while the outer press-fitting surface 51pi and the inner press-fitting surface 52pi are parallel to the axial direction.
  • the outer press-fit surface 51pi and the inner press-fit surface 52pi may be formed on the movable core side in the axial direction or may be formed on the non-movable core side.
  • the outer press-fitting surface 51pi and the inner press-fitting surface 52pi are on the movable core side from the end surface on the non-movable core side (upper side in FIG. Extend to.
  • the outer melting portion 51w and the inner melting portion 52w are located on the end surface of the nonmagnetic member 60 on the movable core 40 side (lower side in FIG. 17) in the axial direction.
  • the outer press-fit surface 51pi and the inner press-fit surface 52pi extend from the end surface on the movable core side in the axial direction of the nonmagnetic member 60 to the non-movable core side.
  • the outer melting portion 51w and the inner melting portion 52w are located on the end surface of the nonmagnetic member 60 on the side opposite to the movable core in the axial direction.
  • the outer press-fit surface 51pi extends from the end surface on the non-movable core side in the axial direction of the nonmagnetic member 60 to the movable core side.
  • the inner press-fit surface 52pi extends from the end surface on the movable core side in the axial direction of the nonmagnetic member 60 to the non-movable core side.
  • the outer melting portion 51w is located on the end surface of the nonmagnetic member 60 on the movable core side in the axial direction.
  • the inner melting portion 52w is located on the end surface of the nonmagnetic member 60 on the side opposite to the movable core in the axial direction.
  • the outer press-fit surface 51pi into which the non-magnetic member 60 is press-fitted is formed on the surface of the outer core portion 51 that is joined to the non-magnetic member 60. For this reason, since the axial force applied to the outer melting portion 51w is reduced, the possibility that the outer melting portion 51w breaks due to the axial force can be suppressed.
  • an inner press-fit surface 52pi into which the non-magnetic member 60 is press-fitted is formed on the surface of the inner core portion 52 that is joined to the non-magnetic member 60.
  • the method for manufacturing a fuel injection valve according to the present embodiment includes steps S10 to S40 shown in FIG.
  • step S10 first step
  • the inner core portion 52 is cut into a shape including a portion indicated by a dotted line in the column (1) or (2) in FIG. That is, it is processed into an axially extending cylindrical shape having an inner tapered surface 52f and an inner press-fitting surface 52pi.
  • step S11 second step
  • the outer core portion 51 is cut into a shape including a portion indicated by a dotted line in the column (1) or (2) in FIG. That is, it is processed into an axially extending cylindrical shape having an outer tapered surface 51f and an outer press-fit surface 51pi.
  • the outer press-fit surface 51pi and the inner press-fit surface 52pi extend from the end surface on the movable core side in the axial direction of the nonmagnetic member 60 to the non-movable core side.
  • the outer press-fit surface 51pi and the inner press-fit surface 52pi extend from the end surface on the non-movable core side in the axial direction to the movable core side of the nonmagnetic member 60.
  • step S12 the nonmagnetic member 60 is cut into a shape including a portion indicated by a dotted line in the column (1) or (2) in FIG. That is, the nonmagnetic member 60 has a shape having a portion (press-fit portion 60pi) sandwiched between the outer press-fit surface 51pi and the inner press-fit surface 52pi in addition to a portion sandwiched between the outer tapered surface 51f and the inner tapered surface 52f.
  • step S10 and step S11 the inner tapered surface 52f and the outer tapered surface 51f are formed in a shape that is inclined in the same direction with respect to the axis.
  • step S12 the nonmagnetic member 60 is formed in a shape having a surface parallel to the inclination.
  • step S20 press-fitting step after steps S10, S11, and S12, outer core portion 51, inner core portion 52, and nonmagnetic member 60 are temporarily assembled in the state shown in FIG. That is, the inner press-fit surface 52pi and the press-fit portion 60pi are pressed into each other so that the inner core portion 52 and the nonmagnetic member 60 cannot move relative to each other. Further, the outer press-fit surface 51pi and the press-fit portion 60pi are press-fitted together so that the outer core 51 and the nonmagnetic member 60 cannot move relative to each other.
  • the outer brazing material 51br is interposed between the outer tapered surface 51f and the nonmagnetic member 60
  • the inner brazing material 52br is interposed between the inner tapered surface 52f and the nonmagnetic member 60.
  • step S30 after step S20, the outer core portion 51, the inner core portion 52, and the nonmagnetic member 60 in a press-fitted and fixed state are heated to melt the outer brazing material 51br and the inner brazing material 52br, and the outer core portion. 51, the inner core portion 52 and the nonmagnetic member 60 are brazed.
  • step S40 retractal step after step S30, the portion indicated by the dotted line in FIG. 19 is removed from the portion indicated by the solid line. That is, the portion of the inner core portion 52 including the inner press-fit surface 52pi, the portion of the outer core portion 51 including the outer press-fit surface 51pi, and the press-fit portion 60pi of the nonmagnetic member 60 are removed by cutting. As a result, as shown in FIG. 15, a fuel injection valve having a structure in which the entire outer tapered surface 51f and inner tapered surface 52f are brazed and does not have the press-fit portion 60pi is manufactured.
  • the inner press-fit surface 52pi is formed in the inner core portion 52
  • the outer press-fit surface 51pi is formed in the outer core portion 51.
  • the subsequent press-fitting step (step S20) the inner press-fit surface 52pi and the nonmagnetic member 60 are press-fitted together, and the outer press-fit surface 51pi and the nonmagnetic member 60 are press-fitted together.
  • step S40 the portion of the inner core portion 52 that includes the inner press-fit surface 52pi, the portion of the outer core portion 51 that includes the outer press-fit surface 51pi, and the press-fit portion 60pi of the nonmagnetic member 60 are removed. . Therefore, since the brazing operation (joining operation) in step S30 can be performed in the press-fitted and fixed state, the possibility that the outer core portion 51 and the inner core portion 52 are joined while being displaced can be reduced.
  • the manufacturing method according to this embodiment includes the steps S10A to S50 shown in FIG.
  • step S10A first step
  • the inner core portion 52 is cut into the shape shown in FIG. That is, it is processed into an axially extending cylindrical shape having an inner tapered surface 52f.
  • step S11A second step
  • the outer core portion 51 is cut into the shape shown in FIG. That is, it is processed into an axially extending cylindrical shape having an outer tapered surface 51f.
  • step S12A the nonmagnetic member 60 is cut into the shape shown in FIG. That is, the nonmagnetic member 60 has a shape having an outer facing surface 61f extending in parallel with the outer tapered surface 51f and an outer inclined surface 61m continuous from the outer facing surface 61f.
  • the outer inclined surface 61m has a shape that extends from the end surface on the movable core side in the axial direction of the nonmagnetic member 60 to the side opposite to the movable core and is inclined in a direction away from the outer tapered surface 51f as shown in FIG. It is.
  • the nonmagnetic member 60 has an inner facing surface 62f extending in parallel with the inner tapered surface 52f and an inner inclined surface 62m continuous from the inner facing surface 62f.
  • the inner inclined surface 62m has a shape extending from the end surface on the movable core side in the axial direction of the nonmagnetic member 60 to the opposite movable core side, and is inclined in a direction away from the inner tapered surface 52f as shown in FIG.
  • step S20A after steps S10A, S11A, and S12A, outer core portion 51, inner core portion 52, and nonmagnetic member 60 are temporarily assembled in the state shown in FIG. That is, the outer tapered surface 51f and the outer facing surface 61f are brought into contact with each other, and the inner tapered surface 52f and the inner facing surface 62f are brought into contact with each other.
  • the gap M is provided between the outer inclined surface 61m and the outer tapered surface 51f and between the inner inclined surface 62m and the inner tapered surface 52f.
  • the gap M has a shape extending from the exposed surface 60 m exposed from the fixed core 50 in the surface of the nonmagnetic member 60 toward the inside of the fixed core 50.
  • step S50 laser welding step
  • the outer tapered surface 51f and the nonmagnetic member 60 are laser welded
  • the inner tapered surface 52f and the nonmagnetic member 60 are laser welded.
  • laser light is incident from the movable core side in the axial direction toward the gap M.
  • the outer tapered surface 51f and the outer facing surface 61f are melted and welded.
  • the inner tapered surface 52f and the inner facing surface 62f are melted and welded.
  • the outer tapered surface 51f and the inner tapered surface 52f are partially welded to produce a fuel injection valve having a structure in which the outer melting portion 51w and the inner melting portion 52w are formed.
  • the gap M extending from the exposed surface 60 m of the nonmagnetic member 60 toward the inside is provided between the inner tapered surface 52 f and the outer tapered surface 51 f and the nonmagnetic member 60. Then, laser welding is performed by irradiating the gap M from the inside toward the inside so that part of the inner tapered surface 52f and the outer tapered surface 51f is integrated with the nonmagnetic member 60 by laser welding (step S50). including. Therefore, it is possible to deeply weld with a small laser output as compared with the case where laser welding is performed in a state where no gap M is provided, contrary to the present embodiment.
  • the welding depth can be increased while reducing the welding width of the outer melting portion 51w and the inner melting portion 52w. Therefore, since the welding depth can be increased while reducing the volume of the melted portion having a large magnetic resistance, it is possible to suppress the possibility of breaking by the axial force while suppressing the deterioration of the performance of the magnetic characteristics of the fixed core 50.
  • the manufacturing method according to this embodiment includes steps S10B to S60 shown in FIG.
  • step S10B first step
  • step S11B second step
  • step S11B the outer core portion 51 is cut into the shape shown in FIG. That is, it is processed into an axially extending cylindrical shape having an outer tapered surface 51f.
  • step S12B the nonmagnetic member 60 is cut into the shape shown in FIG. That is, the nonmagnetic member 60 is processed into a shape having an outer facing surface that extends parallel to the outer tapered surface 51f and an inner facing surface that extends parallel to the inner tapered surface 52f.
  • step S10B, S11B, and S12B a sintered material is used as the material of the inner core portion 52, the outer core portion 51, and the nonmagnetic member 60.
  • step S20B after steps S10B, S11B, and S12B, the outer core portion 51, the inner core portion 52, and the nonmagnetic member 60 are temporarily assembled in the state shown in FIG.
  • step S60 integration step after step S20B, the temporarily assembled outer core portion 51, inner core portion 52, and nonmagnetic member 60 are heated. Thereby, the outer core part 51, the inner core part 52, and the nonmagnetic member 60 are baked and integrated. As a result, a fuel injection valve having a structure in which the entire outer tapered surface 51f and inner tapered surface 52f are integrated with the nonmagnetic member 60 is manufactured.
  • the fixed core 50 and the nonmagnetic member 60 are made of sintered material, and the fixed core 50 and the nonmagnetic member 60 are integrated by firing the sintered material (step S60). including. Therefore, it is possible to reduce the risk of fracture of the joint surface due to the axial force as compared with the case where the components are not integrated. Further, in integrating the entire surface of the tapered surface with the non-magnetic member 60, it is difficult to weld the entire surface by laser welding as described above, but in this embodiment, the entire surface is integrated by firing with a sintered material. Compared with laser welding, the entire surface can be easily integrated.
  • the finishing operation can be simplified (near net shape processing), and the processing accuracy of the tapered surface can be improved.
  • the movable core 40 has an inner suction surface 40a (first suction surface) sucked by the inner facing surface 52a of the fixed core 50 and an outer facing. And an outer suction surface 40c (second suction surface) sucked by the surface 51c.
  • the direction of the magnetic flux passing through the inner suction surface 40a and the direction of the magnetic flux passing through the outer suction surface 40c are different from each other.
  • the inner suction surface 40a and the outer suction surface 40c are provided at different positions in the direction (axial direction) in which the annular center line C extends.
  • the inner suction surface 40a and the outer suction surface 40c are surfaces orthogonal to the axial direction, and the movable core 40 can be said to have a stepped shape.
  • the inner facing surface 52a and the outer facing surface 51c of the fixed core 50 are provided at different positions in the axial direction. These facing surfaces are surfaces orthogonal to the axial direction, and the inner facing surface 52a is located on the side opposite to the injection hole of the outer facing surface 51c.
  • the structures of the outer tapered surface 51f and the inner tapered surface 52f, such as the shape, surface roughness, and inclination angle, are the same as those in the first embodiment.
  • a connecting member 32 is fixedly attached to the end of the valve body 30 on the side opposite to the injection hole by welding or the like. Furthermore, an orifice member 33 in which an orifice 33a (throttle portion) is formed and a movable core 40 are attached to the end of the connecting member 32 on the side opposite to the injection hole. The movable core 40 moves in the axial direction together with the connecting member 32, the valve body 30, the orifice member 33, and the sliding member 34.
  • the connecting member 32 has a cylindrical shape extending in the axial direction, the orifice member 33 is fixed to the inner peripheral surface of the connecting member 32 by welding or the like, and the movable core 40 is fixed to the outer peripheral surface of the connecting member 32 by welding or the like.
  • An engaging portion 31 that expands in the radial direction is formed at the end of the connecting member 32 opposite to the injection hole. The end surface on the injection hole side of the engaging portion 31 engages with the movable core 40, thereby preventing the connecting member 32 from coming out toward the injection hole with respect to the movable core 40.
  • the orifice member 33 has a cylindrical shape extending in the axial direction, and the inside of the cylinder functions as a flow passage through which fuel flows.
  • An orifice 33a (throttle portion) for narrowing the flow area by partially narrowing the passage area of the flow passage is formed at the nozzle hole side end of the orifice member 33.
  • the sliding member 34 is separate from the movable core 40 and is pressed against the movable core 40 by the elastic force of the contact elastic member 35s.
  • the movable core 40 is made of a material having higher magnetic properties than the sliding member 34
  • the sliding member 34 is made of a material having higher wear resistance than the movable core 40.
  • the sliding member 34 is fixed to the movable core 40 by welding or the like.
  • the sliding member 34 has a cylindrical shape, and the cylindrical outer peripheral surface of the sliding member 34 functions as a sliding surface 34 a that slides with respect to the inner peripheral surface of the cover 90.
  • the outer diameter dimension of the sliding surface 34 a is smaller than the outer diameter dimension of the movable core 40. That is, the position of the sliding surface 34 a in the direction perpendicular to the sliding direction of the sliding member 34 is located inside the outermost peripheral position of the movable core 40, that is, on the annular center line C side.
  • the movable core 40 has a stepped shape having the inner suction surface 40a (first suction surface) and the outer suction surface 40c (second suction surface) provided at different positions in the axial direction. Is formed. Further, the direction of the magnetic flux is different between the first suction surface and the second suction surface. According to this, contrary to the present embodiment, the magnetic attractive force can be improved as compared with a movable core provided with two attractive surfaces having different magnetic flux directions at the same position in the axial direction. The reason will be described below.
  • the magnetic field strength generated by the coil 70 is highest at the central portion of the coil 70 in the axial direction.
  • the first suction surface is arranged closer to the coil 70 side than the second suction surface in the axial direction, the first suction surface is located at the central portion where the magnetic field strength is high. They will be placed close together. Therefore, the magnetic attractive force can be improved as compared with the movable core in which the first attractive surface is provided at the same position in the axial direction as the second attractive surface.
  • the annular outer peripheral surface of the coil 70 is located on the radially outer side than the outer peripheral surface of the movable core 40.
  • the annular outer peripheral surface of the coil 70 may have the same radial position as the outer peripheral surface of the movable core 40, or may be positioned radially inward.
  • the core portion having a large pressure receiving surface that receives fuel pressure from the movable core 40 side is the inner core portion 520, that is, the large pressure receiving core portion. It is.
  • the outer core portion 51 may have a larger pressure receiving surface than the inner core portion 520, and the outer core portion 51 may be a large pressure receiving core portion. In this case, it is necessary to reverse the direction in which the outer tapered surface 510f and the inner tapered surface 520f are inclined to the direction shown in FIG.
  • the fastening member 81 corresponding to the inner imparting portion imparts an axial force F10 in a direction in which the inner core portion 52 is pressed against the nozzle hole side, and the main body portion 21 corresponding to the outer imparting portion is provided.
  • the reaction force F20 is applied in the direction in which the outer core portion 51 is pressed against the side of the injection hole.
  • the inner imparting portion imparts an axial force F10 in a direction in which the inner core portion 52 is pressed against the nozzle hole side
  • the outer imparting portion applies a reaction force F20 in a direction in which the outer core portion 51 is pressed against the counter nozzle hole side.
  • the structure to provide may be sufficient. In this case, it is necessary to make the directions of inclination of the outer tapered surface 51f and the inner tapered surface 52f opposite to those in FIG.
  • the first embodiment shown in FIG. When the fixed core 50 is not receiving fuel pressure from the nozzle hole side, the fixed core 50 is elastically deformed by the axial force F10 and the reaction force F20, that is, a state in which prestress is applied.
  • the application of the prestress may be abolished while adopting the same configuration as in FIG. Specifically, the amount of fastening when fastening member 81 is fastened to case 10 is reduced, and the application of prestress is abolished.
  • FIG. 7 and 8 is a structure that receives the pre-stress at a step
  • the embodiment shown in FIG. 9 is a structure that receives the fuel pressure at a tapered surface.
  • a structure combining these, that is, a structure that receives the fuel pressure at a step may be adopted.
  • both the outer inclination angle 51 ⁇ and the inner inclination angle 52 ⁇ are set to 10 degrees or more. However, even if either one is set to less than 10 degrees and the other is set to 10 degrees or more, Alternatively, both may be set to less than 10 degrees.
  • both the outer surface roughness sum Rz1 and the inner surface roughness sum Rz2 are set to 20 ⁇ m or more, but one of them is set to less than 20 ⁇ m and the other is set to 20 ⁇ m or more. Alternatively, both may be set to less than 20 ⁇ m.
  • brazing and joining are performed, and then the press-fit portion is removed.
  • joining may be performed by welding, diffusion joining or You may join by baking.
  • the grooves 51fc and 52fc are formed in both the outer tapered surface 51f and the inner tapered surface 52f, but they may be formed in either one. Further, instead of forming the grooves 51fc and 52fc on the entire surface of the outer tapered surface 51f and the inner tapered surface 52f, the grooves 51fc and 52fc may be formed on a part of the outer tapered surface 51f and the inner tapered surface 52f. In particular, the grooves 51 fc and 52 fc may be abolished for a portion to be integrated by welding or brazing. On the other hand, it is desirable to increase the friction coefficient by forming grooves 51fc and 52fc for the parts to be integrated by welding or brazing.
  • the sintered material is used for all of the inner core portion 52, the outer core portion 51, and the nonmagnetic member 60. However, at least one of the inner core portion 52, the outer core portion 51, and the nonmagnetic member 60 is used. A sintered material may be used for one. Further, if a sintered material is used for the joint portion between the fixed core 50 and the nonmagnetic member 60, the sintered material is used instead of the entire nonmagnetic member 60, and a portion of the nonmagnetic member 60 is sintered. A binder may be used. Similarly, when using a sintered material for the inner core portion 52 and the outer core portion 51, a sintered material may be used for a part of the inner core portion 52 and the outer core portion 51.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Un noyau fixe (50) est pourvu : d'une partie noyau interne (52) qui fait face à un noyau mobile (40) ; et d'une partie noyau externe (51) qui est positionnée plus loin vers l'extérieur que la partie noyau interne par rapport à une ligne centrale (C) d'anneau, et qui fait face au noyau mobile. Cette soupape d'injection de carburant est pourvue : d'un élément de restriction (81, 810) qui limite le mouvement de la partie noyau interne et/ou de la partie noyau externe en direction du côté opposé au noyau mobile du fait que la partie noyau interne et/ou la partie noyau externe sont soumises à une pression de carburant ; et un élément non magnétique (60) qui est disposé entre les parties noyau interne et externe, et qui a un magnétisme plus faible que le noyau fixe. Une surface conique interne (52f), qui est inclinée par rapport à la ligne centrale de l'anneau dans une section transversale comprenant la ligne centrale de l'anneau, est formée dans au moins une partie de la surface de la partie noyau interne qui est jointe à l'élément non magnétique. Une surface conique externe (51f), qui est inclinée par rapport à la ligne centrale de l'anneau dans une section transversale comprenant la ligne centrale de l'anneau, est formée dans au moins une partie de la surface de la partie de noyau externe qui est jointe à l'élément non magnétique. Les surfaces coniques interne et externe ont des formes qui sont inclinées dans la même direction par rapport à la ligne centrale de l'anneau.
PCT/JP2017/026177 2016-07-28 2017-07-20 Soupape d'injection de carburant WO2018021123A1 (fr)

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DE112017003774.3T DE112017003774T5 (de) 2016-07-28 2017-07-20 Kraftstoffeinspritzventil

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JP2016-148841 2016-07-28
JP2016148841 2016-07-28
JP2017085606A JP6520983B2 (ja) 2016-07-28 2017-04-24 燃料噴射弁、および燃料噴射弁の製造方法
JP2017-085606 2017-04-24

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1758105A (en) * 1928-03-29 1930-05-13 Louis O French Electromagnetic valve
JPH1144275A (ja) * 1997-07-03 1999-02-16 Zexel Corp 燃料噴射装置用ソレノイドバルブ
JP2000046224A (ja) * 1998-07-28 2000-02-18 Zexel Corp ディスク型電磁弁の製造方法
EP2747095A2 (fr) * 2012-12-21 2014-06-25 Robert Bosch Gmbh Électrovanne et procédé destiné à la fabrication d'une électrovanne
JP2014141924A (ja) * 2013-01-24 2014-08-07 Hitachi Automotive Systems Ltd 燃料噴射装置
JP2014177877A (ja) * 2013-03-14 2014-09-25 Hitachi Automotive Systems Ltd 電磁式燃料噴射弁
JP2016065539A (ja) * 2014-09-17 2016-04-28 株式会社デンソー 燃料噴射弁
JP2016125360A (ja) * 2014-12-26 2016-07-11 株式会社日本自動車部品総合研究所 燃料噴射弁

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1758105A (en) * 1928-03-29 1930-05-13 Louis O French Electromagnetic valve
JPH1144275A (ja) * 1997-07-03 1999-02-16 Zexel Corp 燃料噴射装置用ソレノイドバルブ
JP2000046224A (ja) * 1998-07-28 2000-02-18 Zexel Corp ディスク型電磁弁の製造方法
EP2747095A2 (fr) * 2012-12-21 2014-06-25 Robert Bosch Gmbh Électrovanne et procédé destiné à la fabrication d'une électrovanne
JP2014141924A (ja) * 2013-01-24 2014-08-07 Hitachi Automotive Systems Ltd 燃料噴射装置
JP2014177877A (ja) * 2013-03-14 2014-09-25 Hitachi Automotive Systems Ltd 電磁式燃料噴射弁
JP2016065539A (ja) * 2014-09-17 2016-04-28 株式会社デンソー 燃料噴射弁
JP2016125360A (ja) * 2014-12-26 2016-07-11 株式会社日本自動車部品総合研究所 燃料噴射弁

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