WO2022254981A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2022254981A1
WO2022254981A1 PCT/JP2022/018043 JP2022018043W WO2022254981A1 WO 2022254981 A1 WO2022254981 A1 WO 2022254981A1 JP 2022018043 W JP2022018043 W JP 2022018043W WO 2022254981 A1 WO2022254981 A1 WO 2022254981A1
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WO
WIPO (PCT)
Prior art keywords
valve
fuel
valve seat
hole
fuel injection
Prior art date
Application number
PCT/JP2022/018043
Other languages
English (en)
Japanese (ja)
Inventor
裕和 佐々木
雄大 三浦
和也 齋藤
Original Assignee
日立Astemo株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to CN202280038751.5A priority Critical patent/CN117413120A/zh
Priority to JP2023525651A priority patent/JPWO2022254981A1/ja
Publication of WO2022254981A1 publication Critical patent/WO2022254981A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the present invention mainly relates to a fuel injection valve used in the fuel supply system of an engine.
  • a valve seat member having a conical valve seat and a valve hole passing through the center thereof at the front end, and a spherical valve part that cooperates with the valve seat to open and close the valve hole and an injector plate joined to the front end surface of the valve seat member and having a plurality of fuel injection holes arranged radially outwardly away from the valve hole and communicating with the valve hole.
  • a fuel collecting chamber is provided between the valve seat and the valve hole to collect the fuel that has passed through the valve seat and guide it to the valve hole, and between the opposed surfaces of the valve seat member and the injector plate
  • the Japanese Patent Application Laid-Open No. 2002-200002 discloses a flat fuel diffusion chamber for radially diffusing fuel that has passed through a valve hole and guiding the fuel to the plurality of fuel injection holes.
  • the peripheral wall of the fuel collecting chamber rises from the bottom surface, forming a stepped portion from the valve seat to the bottom surface of the fuel collecting chamber.
  • the present invention has been made in view of such circumstances.
  • the object is to provide an injection valve.
  • the present invention provides a valve seat member having a conical valve seat and a valve hole penetrating the center of the valve seat member at the front end, and a spherical valve opening and closing the valve hole in cooperation with the valve seat.
  • An injector having a valve body having a valve portion at its front end, and a plurality of fuel injection holes joined to the front end surface of the valve seat member and arranged radially outwardly away from the valve hole to communicate with the valve hole.
  • a fuel collecting chamber connecting between the valve seat and the valve hole is provided in the valve seat member, while the valve hole and the plurality of fuel injection chambers are provided between the opposing surfaces of the valve seat member and the injector plate.
  • the bottom surface of the fuel collecting chamber is centered on the center line of the valve seat, and the intersection with the center line is within the valve hole.
  • the first feature is that it is composed of a concave curved surface formed along the spherical zone of the phantom spherical surface on which it is located.
  • the present invention further provides that the valve seat member has a guide hole with a polygonal cross-section for guiding the opening and closing operation of the spherical valve portion, and a plurality of inner corners of the guide hole and the A second feature is that a plurality of fuel passages connected to the valve seat are defined between the valve portion and the spherical valve portion.
  • the bottom surface of the fuel collecting chamber connecting between the valve seat and the valve hole is centered on the center line of the valve seat, and the intersection with the center line is positioned within the valve hole.
  • the guide hole for guiding the opening/closing operation of the spherical valve portion is formed in the valve seat member so as to have a polygonal cross section.
  • a plurality of fuel passages may be provided around the spherical valve portion.
  • the guide hole having a polygonal cross section can be formed by forging the valve seat member together with the valve seat, the manufacturing cost can be reduced.
  • FIG. 1 is a vertical sectional view showing an embodiment of a fuel injection valve for an engine according to the present invention. Enlarged view of 2 arrows in FIG. 3-3 line sectional view of FIG.
  • the fuel injection side is defined as the front, and the fuel inlet side is defined as the rear.
  • a cylinder head 40 of an engine E is provided with a mounting hole 41 opening to a combustion chamber 42, and a fuel injection valve I capable of injecting fuel into the combustion chamber 42 is mounted in the mounting hole 41. be done. At that time, a cushion member 43 is interposed between the fuel injection valve I and the cylinder head 40 .
  • the valve housing 2 of the fuel injection valve I includes a cylindrical valve seat member 3, a magnetic cylindrical body 4 fitted to the outer peripheral surface of the rear end portion of the valve seat member 3 and welded in a liquid-tight manner, and a magnetic body 4.
  • a non-magnetic cylindrical body 6 abuts against the rear end of the cylindrical body 4 and is liquid-tightly welded, and a small-diameter front end portion 5a is fitted to the inner peripheral surface of the non-magnetic cylindrical body 6 and is liquid-tightly welded.
  • a fuel inlet cylinder 26 fitted to the outer circumference of the rear end of the fixed core 5 and welded in a liquid-tight manner.
  • the valve seat member 3 has a conical valve seat 8 , a valve hole 7 passing through the central portion of the valve seat 8 , and a guide hole 9 communicating with the large diameter portion of the valve seat 8 .
  • a hollow cylindrical movable core 12 facing the front end face of the fixed core 5 is fitted to the magnetic cylindrical body 4 extending from that portion to the front end of the non-magnetic cylindrical body 6 .
  • a valve body 13 is connected to the movable core 12 .
  • the valve body 13 has a spherical valve portion 14 which can slide in the guide hole 9 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and a front end welded to the valve portion 14.
  • the rear end of the valve rod 15 is press-fitted into the inner peripheral surface of the movable core 12 and welded. Therefore, the valve element 13 can move up and down within the valve housing integrally with the movable core 12 .
  • the valve rod 15 is made of a pipe material with a slit 15a, the inside of which communicates with the hollow portion of the movable core 12, and the inside and outside of the valve rod 15 communicate through the slit 15a.
  • a retainer 20 made of a slotted pipe material is press-fitted into the hollow portion of the fixed core 5 at its intermediate portion and fixed, and its front end serves as a first spring seat 21 .
  • the rear end portion of the valve rod 15 ends in the middle of the hollow portion of the movable core 12, and the upper end portion thereof serves as the second spring seat 22.
  • the spring 23 is compressed, and the set load of the valve spring 23 urges the movable core 12 away from the fixed core 5, that is, the valve body 13 in the valve closing direction.
  • the set load of this valve spring 23 is adjusted by the fitting depth of the retainer 20 to the fixed core 5 .
  • a ring-shaped stopper member 35 made of a non-magnetic material is embedded in the inner peripheral surface of the movable core 12 and protrudes slightly from the rear end surface. The stopper member 35 abuts against the fixed core 5 to maintain a constant gap between the two cores 5 and 12 when the fixed core 5 is attracted to the movable core 12 .
  • a coil assembly 28 is fitted on the outer periphery of the valve housing 2 so as to correspond to both cores 5 and 12 .
  • This coil assembly 28 consists of a synthetic resin bobbin 29 fitted on the outer peripheral surface of the fixed core 5 from the rear end of the magnetic cylinder 4 and a coil 30 wound thereon.
  • a terminal support arm 29a is integrally formed at the rear end of the bobbin 29 to support the base end of the power supply terminal 33 projecting to one side thereof. be done.
  • a yoke 31 is arranged on the outer circumference of the coil assembly 28 .
  • a synthetic resin coating layer 27 covering the outer peripheral surface of the magnetic cylinder 4 and the fuel inlet tube 26 and embedding the coil assembly 28 is injection molded.
  • a coupler 34 that accommodates and holds the power supply terminal 33 and protrudes to one side of the coil assembly 28 is molded integrally with the coating layer 27 .
  • a fuel filter 36 is attached to the inlet of the fuel inlet tube 26 .
  • a fuel cap 46 is fitted on the outer circumference of the upper end of the fuel inlet tube 26 with a seal member 47 interposed therebetween.
  • This fuel cap 46 is one of a plurality of fuel distribution caps branched from a fuel rail 45 connected to a discharge port of a fuel pump (not shown).
  • the guide hole 9 provided in the valve seat member 3 has a polygonal cross-section (hexagonal shape in the illustrated example) and extends rearward along the center line Y of the valve seat 8 from the large-diameter portion of the conical valve seat 8 . formed to extend. That is, the guide hole 9 has a polygonal cross-section (a hexagonal shape in the illustrated example) formed by arranging three or more flat surfaces 9a having the same width so as to surround the center line. It guides the upward/downward movement of the spherical valve portion 14, that is, the opening/closing operation.
  • a plurality of fuel passages 37 are defined between the inner corners 9 b of the guide hole 9 and the spherical valve portion 14 .
  • a communication recess 38 is provided between the valve seat 8 and each flat surface 9a to connect the adjacent fuel passages 37.
  • the large-diameter portion of the conical valve seat 8 has a star shape in plan view.
  • valve seat member 3 is provided with a guide hole 16 extending from the guide hole 9 in a tapered shape toward the rear.
  • This guide hole 16 has a function of guiding the spherical valve portion 14 to the guide hole 9 when the fuel injection valve I is assembled.
  • valve seat member 3 is provided with a fuel collecting chamber 49 that connects between the valve seat 8 and the valve hole 7 .
  • the bottom surface of the fuel collecting chamber 49 is composed of a concave curved surface 49a formed as follows.
  • the center Bo of the phantom spherical surface B whose radius R2 is smaller than the radius R1 of the spherical valve portion 14 is moved along the center line Y of the valve seat 8 from the center O of the spherical valve portion 14.
  • the phantom spherical surface B passes through the small diameter side edge of the conical valve seat 8 and intersects with the center line Y at the intersection point P within the valve hole 7. let it intersect.
  • the concave curved surface 49a is formed following the spherical zone portion from the small diameter side edge of the valve seat 8 to the rear edge (upper edge in the illustrated example) of the valve hole 7. As shown in FIG.
  • the concave curved surface 49a is formed by forging the valve seat member 3 together with the valve seat 8, the guide hole 9 and the guide hole 16.
  • a steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve hole 7 is liquid-tightly welded to the front end surface of the valve seat member 3 .
  • a flat fuel diffusion chamber that spreads radially outward from the valve hole 7 and diffuses the fuel that has passed through the valve hole 7 radially outward. 50 are formed.
  • the fuel diffusion chamber 50 is formed as a recess in the front end surface of the valve seat member 3 in the illustrated example.
  • a plurality of fuel injection holes 11 that open into the fuel diffusion chamber 50 are formed in the injector plate 10 at positions spaced radially outward from the valve hole 7 . Therefore, the valve hole 7 and each fuel injection hole 11 are communicated through the fuel diffusion chamber 50 .
  • valve hole 7 is configured with a convex curved surface 7a so as to smoothly continue to the bottom surface of the fuel collecting chamber 49 and the ceiling surface of the fuel diffusion chamber 50.
  • the fuel inlet tube 26, the fixed core 5, the hollow portions of the valve rod 15 and the valve housing 2, the slot 15a of the valve rod 15, the fuel passage 37 and the communicating recess 38 around the spherical valve portion 14 are the fuel inlet.
  • a series of fuel passages 18 are defined from the inlet of the cylinder 26 to the valve seat 8 .
  • the magnetic flux generated by the coil 30 runs through the fixed core 5, the coil housing (yoke) 31, the magnetic cylindrical body 4 and the movable core 12 in sequence, and the magnetic force causes the movable core 12 to set the valve spring 23. Since the spherical valve portion 14 of the valve element 13 is lifted off from the valve seat 8 by being sucked by the fixed core 5 against the load, the high-pressure fuel in the fuel flow passage 18 passes through the valve seat 8 and then flows into the fuel assembly.
  • the fuel is gathered and guided to the valve hole 7 by the chamber 49, the flow is reversed at the valve hole 7, transferred to the fuel diffusion chamber 50, diffused radially, and injected from the plurality of fuel injection holes 11 of the injector plate 10, resulting in a plurality of sprays.
  • Form F The fuel is gathered and guided to the valve hole 7 by the chamber 49, the flow is reversed at the valve hole 7, transferred to the fuel diffusion chamber 50, diffused radially, and injected from the plurality of fuel injection holes 11 of the injector plate 10, resulting in a plurality of sprays.
  • the bottom surface of the fuel collecting chamber 49 connecting the valve seat 8 and the valve hole 7 has a center Bo on the center line Y of the valve seat 8, and the intersection point P with the center line Y is within the valve hole 7. Since the concave curved surface 49a is formed along the spherical band of the phantom spherical surface B located at , a stepped portion is not formed at the connection portion of the bottom surface of the fuel collecting chamber 49 with the valve seat 8. Therefore, when the valve element 13 is open, when the fuel flows from the valve seat 8 into the fuel collecting chamber 49, it is possible to prevent the generation of vortices and reduce the pressure loss of the fuel flow.
  • the pressure loss in the fuel flow can be reduced.
  • the inner peripheral surface (convex curved surface) 7a of the valve hole 7 is formed of a convex curved surface so as to be continuous with the bottom surface of the fuel collecting chamber 49 and the ceiling surface of the fuel diffusion chamber 50,
  • the reversal of the fuel flow at is very smoothly guided by the inner peripheral surface 7a, and the generation of vortices at the reversal point can be prevented. Therefore, the pressure loss of the fuel flow can be reduced here as well.
  • the guide hole 9 that guides the opening/closing operation of the spherical valve portion 14 into a polygonal cross-section, a plurality of fuel passages 37 can be formed around the spherical valve portion 14 without subjecting the spherical valve portion 14 to planar processing. can be provided. Moreover, since the guide hole 9 having a polygonal cross section can be forged into the valve seat member 3 together with the valve seat 8, the manufacturing cost can be reduced.

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

Abstract

Dans une soupape d'injection de carburant (I), lorsqu'un corps de soupape (13) est ouvert et que du carburant qui a traversé un siège de soupape (8) s'écoule dans une chambre de collecte de carburant (49), des tourbillons ne sont pas générés et une perte de pression dans l'écoulement de carburant est éliminée. La surface inférieure de la chambre de collecte de carburant (49) est constituée d'une surface incurvée concave (49a) formée le long d'une surface sphérique virtuelle (B) dont un centre (Bo) est placé sur une ligne centrale (Y) du siège de soupape (8) et un point d'intersection (P) avec la ligne centrale (Y) est positionné dans un trou de soupape (7).
PCT/JP2022/018043 2021-06-03 2022-04-18 Soupape d'injection de carburant WO2022254981A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280038751.5A CN117413120A (zh) 2021-06-03 2022-04-18 燃料喷射阀
JP2023525651A JPWO2022254981A1 (fr) 2021-06-03 2022-04-18

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-093927 2021-06-03
JP2021093927 2021-06-03

Publications (1)

Publication Number Publication Date
WO2022254981A1 true WO2022254981A1 (fr) 2022-12-08

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ID=84323093

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/018043 WO2022254981A1 (fr) 2021-06-03 2022-04-18 Soupape d'injection de carburant

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JP (1) JPWO2022254981A1 (fr)
CN (1) CN117413120A (fr)
WO (1) WO2022254981A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712776A1 (fr) * 2005-04-14 2006-10-18 Siemens Aktiengesellschaft Corps de soupape et injecteur de fluide avec un corps de soupape
JP2013181409A (ja) * 2012-02-29 2013-09-12 Keihin Corp 電磁式燃料噴射弁
WO2016063390A1 (fr) * 2014-10-23 2016-04-28 三菱電機株式会社 Dispositif de soupape pour soupape d'injection de carburant
JP2020159253A (ja) * 2019-03-26 2020-10-01 日立オートモティブシステムズ株式会社 燃料噴射弁

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712776A1 (fr) * 2005-04-14 2006-10-18 Siemens Aktiengesellschaft Corps de soupape et injecteur de fluide avec un corps de soupape
JP2013181409A (ja) * 2012-02-29 2013-09-12 Keihin Corp 電磁式燃料噴射弁
WO2016063390A1 (fr) * 2014-10-23 2016-04-28 三菱電機株式会社 Dispositif de soupape pour soupape d'injection de carburant
JP2020159253A (ja) * 2019-03-26 2020-10-01 日立オートモティブシステムズ株式会社 燃料噴射弁

Also Published As

Publication number Publication date
CN117413120A (zh) 2024-01-16
JPWO2022254981A1 (fr) 2022-12-08

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