WO2003048560A1 - Injecteur de carburant electronique - Google Patents

Injecteur de carburant electronique Download PDF

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Publication number
WO2003048560A1
WO2003048560A1 PCT/JP2002/011423 JP0211423W WO03048560A1 WO 2003048560 A1 WO2003048560 A1 WO 2003048560A1 JP 0211423 W JP0211423 W JP 0211423W WO 03048560 A1 WO03048560 A1 WO 03048560A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
nozzle
electronically controlled
injection
injection device
Prior art date
Application number
PCT/JP2002/011423
Other languages
English (en)
Japanese (ja)
Inventor
Shogo Hashimoto
Ryoji Ehara
Tadashi Nichogi
Hiroshi Mizui
Original Assignee
Mikuni Corporation
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 Mikuni Corporation filed Critical Mikuni Corporation
Publication of WO2003048560A1 publication Critical patent/WO2003048560A1/fr

Links

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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
    • 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 relates to an electronically controlled fuel injection device, and more particularly to an electronically controlled fuel injection device used for an internal combustion engine mounted on a vehicle such as a motorcycle.
  • fuel is supplied to a fuel injection nozzle while being pressurized by a fuel injection pump, and is supplied to the intake passage in a mist form at the fuel injection nozzle.
  • a fuel supply system provided with a control fuel injection device is known.
  • Fig. 1 shows an example.
  • the fuel supply system includes an electronic control unit that injects the fuel F into the intake passage I of the internal combustion engine by suctioning the fuel F from the fuel tank 2 and then pressurizing the fuel F below the fuel tank 2 in which the fuel F is stored.
  • a fuel injection device 1 is provided, and a suction portion la provided at a lower portion of the electronically controlled fuel injection device 1 and a fuel tank 2 are communicated by a feed pipe 3 for supplying fuel F.
  • the return part lb provided at the upper part of the injector 1 and the fuel tank 2 are communicated by a return pipe 4 for returning surplus fuel discharged from the electronically controlled fuel injector 1 to the fuel tank 2,
  • a low-pressure filter 5 is provided in the middle of the pipe 3, and the electronically controlled fuel injection device 1 includes an injection nozzle 7 protruding into the intake passage I.
  • the injection nozzle 7 is mounted on the nozzle holder 25, a cylindrical guide member 26 disposed in the nozzle holder 25, and reciprocally mounted inside the guide member 26.
  • Cylindrical holding member 27 and the inside of the holding member 27 A poppet valve 29 is mounted so as to be able to move backward and opens and closes a fuel injection passage 28 formed in the guide member 26.
  • reference numeral 35 denotes a return spring for biasing the poppet valve 29 to the closed position
  • reference numeral 37 denotes a negative pressure in the intake passage I when the injection nozzle 7 is opened. This is an assist air orifice that supplies air to the injection nozzle 7 to make the fuel injected from the injection nozzle 7 atomized.
  • the fuel injected from the injection nozzle 7 is atomized and rectified by the assist air supplied through the assist air orifice 37. .
  • the present invention has been made in view of such a conventional problem. Even at a full load or the like where the negative pressure in the intake passage is low, the nozzle holder ⁇ the tip surface of the poppet valve, and It is an object of the present invention to provide an electronically controlled fuel injection device capable of suppressing fuel from adhering to an inner wall. Disclosure of the invention
  • An electronically controlled fuel injection device for injecting fuel into an intake passage of an internal combustion engine in order to achieve the above-mentioned object, and comprises a body, A plunger pump mounted in the body for sucking and pumping the fuel, and an injection nozzle mounted on the body for injecting the fuel, wherein the injection nozzle is a nozzle holder having an injection port formed therein. And before An annular projection is formed at a position of the nozzle holder surrounding the injection port, the valve body being configured to open and close the injection port.
  • An electronic control fuel injection device is characterized in that the annular convex portion according to the first aspect is formed integrally with a tip portion of the nozzle holder.
  • An electronic control fuel injection device is provided with a tip ring forming the injection port at a tip portion of the nozzle holder according to claim 1, and an end face of the tip ring.
  • the annular projection is formed.
  • An electronically controlled fuel injection device for injecting fuel into an intake passage of an internal combustion engine, comprising: a body; A plunger pump for suction-feeding fuel; and an injection nozzle mounted on the body for injecting the fuel, the injection nozzle comprising: a nozzle holder having an injection port formed therein; and a valve for opening and closing the injection port.
  • the valve body is characterized in that a concave portion is formed on an end surface of the valve body to form an annular wall around the entire periphery of the valve body.
  • FIG. 1 is a system configuration diagram of a fuel supply system to which an electronically controlled fuel injection device according to one embodiment of the present invention is applied.
  • FIG. 2 is an enlarged vertical sectional view showing a conventional injection nozzle.
  • FIG. 3 is an enlarged longitudinal sectional view of a main part showing one embodiment of the present invention.
  • FIG. 4 shows an embodiment of the present invention, and is an enlarged vertical sectional view of an injection nozzle.
  • FIG. 5 shows another embodiment of the present invention, and is an enlarged vertical sectional view of an injection nozzle.
  • FIG. 6 shows still another embodiment of the present invention, and is an enlarged vertical sectional view of an injection nozzle.
  • the electronically controlled fuel injection device 1 has a body 6, a plunger pump P mounted in the body 6 for sucking and pumping the fuel F, and a fuel injection device mounted on the body 6 to supply the fuel.
  • a plunger pump P is provided with an injection nozzle 7 for injecting, and a plunger pump P is slidably mounted in the cylinder 8 to form a pressurized chamber 9, and a solenoid coil for exciting the plunger 10.
  • the body 6 is provided with a suction contact pipe 12 constituting a suction portion la at a lower portion thereof, and a return contact pipe 13 constituting a return portion lb at an upper portion thereof.
  • An annular flow path 14 is provided between the cylinder 8 and the solenoid coil 11 to guide a part of the fuel branched at the suction part la toward the return part lb.
  • a return contact pipe 13 is fitted to the cylinder 8 so as to cover the upper outer periphery thereof, and an outer cylinder 15 is fitted to a lower part of the cylinder 8.
  • An intermediate pipe 16 is interposed between the outer cylinder 15 and the return contact pipe 13.
  • An annular core 17 is fitted so as to cover the return contact pipe 13, the intermediate pipe 16, and the outer cylinder 15, and the solenoid coil 11 is wound around the core 17.
  • An annular flow path 14 is formed between the inner peripheral surface of 17, the return contact pipe 13, the intermediate pipe 16, and the outer peripheral surface of the outer cylinder 15.
  • the lower part of the outer cylinder 15 is projected from below the body 6, and a measuring orifice 18 connected to the pressurizing chamber 9 is mounted inside the projected end. ing.
  • a discharge passage 10a for guiding surplus fuel to the return portion, and in this discharge passage 10a, a preload is applied to the fuel F in the initial stage of the pressurization stroke of the plunger 10.
  • a preload valve 19 is provided.
  • a sub-cylinder 20 is mounted above the measuring orifice 18 at a distance from the lower end of the plunger 10, and the outer peripheral surface of the sub-cylinder 20 and the inner A pressurizing chamber 9 is formed between the surface and the inner peripheral surface of the cylinder 8.
  • the upper end of the sub cylinder 20 is brought into contact with the plunger 10 to shield the discharge passage 10a, thereby starting the fuel pressurizing operation.
  • a valve 21 is provided, and an outlet check valve 22 that is opened at the lower end of the sub cylinder 20 when the pressure of the fuel F in the pressurizing chamber 9 reaches a predetermined pressure is provided.
  • a suction path 15a is formed which communicates the suction contact pipe 12 with the pressurizing chamber 9.
  • an inlet check valve 23 is provided in the middle of the suction passage 15a, which allows the fuel F to flow into the pressurizing chamber 9 only during the suction stroke of the plunger 10.
  • the outer cylinder 15 is formed with a branch passage 24 communicating with the annular flow passage 14 and with the suction passage 15 a at the upstream side of the inlet check valve 23.
  • the branch passage 24 is formed via the suction contact pipe 12. A part of the fuel F sucked out is guided to the normal circulation channel 14.
  • the injection nozzle 7 includes a nozzle holder 25 fitted on the outer periphery of the lower end of the outer cylinder 15, a cylindrical guide member 26 provided inside the nozzle 25 and the nozzle member 25, and an inner portion of the guide member 26.
  • a cylindrical holding member 27 is mounted on the guide member 26 so as to be able to reciprocate.
  • a poppet valve 29 for opening and closing the fuel injection passage 28.
  • reference numerals 30 and 31 denote neutral springs for holding the plunger 10 in the neutral position
  • reference numerals 32 33 34 and 35 denote preload valve 19, spy valve 21, and outlet check, respectively.
  • a return spring for biasing the valve 22 and the poppet valve 29 to the closed position is shown
  • reference numeral 36 is a return spring for biasing the inlet check valve 23 to the closed position.
  • reference numeral 37 denotes the supply of air to the injection nozzle 7 by the negative pressure in the intake passage I when the injection nozzle 7 is opened, and the fuel injected from the injection nozzle 7 is atomized. It is an assist air orifice.
  • a return pipe 4 serving as a fuel return pipe communicated with the fuel tank has an end opened to the space of the fuel tank 2 as shown in FIG.
  • annular convex portion 38 is formed on the distal end surface of the nozzle holder 25 at a position surrounding the injection port 25a formed at the center of the nozzle holder 25.
  • the cross section of the annular convex portion 38 is formed so as to gradually narrow toward the front end portion, so that the fuel injected from the injection port 25a and the fuel injected from the nozzle hole 25 can flow around the front end surface of the nozzle holder 25. Is to be suppressed.
  • the plunger pump P When the plunger pump P operates in synchronization with the cycle of the internal combustion engine, the plunger 10 is reciprocated, and is pressurized after being sucked into the pressurizing chamber 9 via the fuel F force feed pipe 3 in the fuel tank 2. Then, the air is injected into the intake passage I in a mist through the injection nozzle 7.
  • the inlet check valve 23 is closed and the fuel F in the pressurization chamber 9 is pressurized, but the pressure of the fuel F is increased to a predetermined pressure.
  • a part of the fuel in the pressurizing chamber 9 is discharged to the discharge passage 10a in the plunger 10 by the action of the preload valve 19, so that the fuel F in the initial stage of the above-described pressurizing process has a predetermined pressure. Is held.
  • the assist air is supplied from the assist air orifice 37 to promote the atomization of the fuel F to be injected as described above, and the fuel is supplied to the intake passage I while being rectified.
  • a tip ring 39 forming the injection port 25a is attached to the tip of the nozzle holder 25 by press fitting or the like, and an annular convex portion 38 is formed on the end face of the tip ring 39. You may do so.
  • the opening angle ⁇ of the injection port 25a can be easily changed, and the opening angle ⁇ of the injection port 25a can be easily changed according to the vehicle or engine characteristics to be applied.
  • the shape of the injection port 25a can be easily made appropriate.
  • a concave portion 29b that forms an annular wall 29a over the entire circumference may be formed on the peripheral surface of the poppet valve 29 on the end face of the poppet valve 29.
  • the annular wall 29a prevents the fuel F force injected from the injection port 25a from sneaking into the tip end face of the poppet valve 29, and the fuel F is supplied to the tip end face of the port valve 29. Can be prevented.
  • the electronically controlled fuel injection device of the present invention even when the negative pressure in the intake passage is small, it is possible to suppress the fuel from adhering to the tip end surface of the injection nozzle, or The increase in the particle size of the attached fuel can be suppressed, and the fluctuation of the air-fuel ratio of the air-fuel mixture supplied to the internal combustion engine can be significantly suppressed.

Landscapes

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

Abstract

L'invention porte sur une buse (7) d'injection comprenant un dispositif de retenue (25) pourvu d'un trou (25a) et un corps de soupape (29) permettant d'ouvrir et de fermer le trou d'injection. Une partie saillante circulaire (38) est formée dans une position entourant le trou d'injection du dispositif de retenue de la buse. Cet injecteur de carburant électronique permet d'empêcher le carburant d'adhérer aux surfaces terminales du dispositif de retenue de la buse et d'un clapet ou à la paroi intérieure d'un passage d'admission d'air, par exemple, même sous la charge de carburant, l'intérieur du passage d'admission d'air étant sous basse pression négative.
PCT/JP2002/011423 2001-11-30 2002-11-01 Injecteur de carburant electronique WO2003048560A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001367577A JP2003166459A (ja) 2001-11-30 2001-11-30 電子制御燃料噴射装置
JP2001/367577 2001-11-30

Publications (1)

Publication Number Publication Date
WO2003048560A1 true WO2003048560A1 (fr) 2003-06-12

Family

ID=19177302

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/011423 WO2003048560A1 (fr) 2001-11-30 2002-11-01 Injecteur de carburant electronique

Country Status (3)

Country Link
JP (1) JP2003166459A (fr)
TW (1) TW200300477A (fr)
WO (1) WO2003048560A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50147022U (fr) * 1974-05-23 1975-12-05
JPH0430266U (fr) * 1990-07-09 1992-03-11
JP2001221137A (ja) * 1999-11-29 2001-08-17 Mikuni Corp 電子制御燃料噴射装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50147022U (fr) * 1974-05-23 1975-12-05
JPH0430266U (fr) * 1990-07-09 1992-03-11
JP2001221137A (ja) * 1999-11-29 2001-08-17 Mikuni Corp 電子制御燃料噴射装置

Also Published As

Publication number Publication date
TW200300477A (en) 2003-06-01
JP2003166459A (ja) 2003-06-13

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