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WO2007091536A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2007091536A1
WO2007091536A1 PCT/JP2007/051969 JP2007051969W WO2007091536A1 WO 2007091536 A1 WO2007091536 A1 WO 2007091536A1 JP 2007051969 W JP2007051969 W JP 2007051969W WO 2007091536 A1 WO2007091536 A1 WO 2007091536A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
orifice
valve body
fuel injection
passage
Prior art date
Application number
PCT/JP2007/051969
Other languages
English (en)
Japanese (ja)
Inventor
Toshio Karasawa
Satoshi Miyazaki
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
Priority to JP2007557838A priority Critical patent/JPWO2007091536A1/ja
Publication of WO2007091536A1 publication Critical patent/WO2007091536A1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/1853—Orifice plates

Definitions

  • the present invention relates to a fuel injection valve that injects fuel into an intake passage of an engine, and more particularly to an electronically controlled fuel injection valve that is electronically controlled by being applied to an engine mounted on a motorcycle or the like.
  • the fuel injection timing, injection amount, etc. are controlled by electronic circuits from the viewpoint of improving fuel efficiency and driving performance in response to exhaust gas regulations, etc.
  • An electronically controlled fuel injection device is employed.
  • the fuel injection device injects high-pressure fuel pumped from a fuel pump force disposed in a fuel tank and guided through a high-pressure feed pipe and a high-pressure filter into an intake passage, and also uses excess fuel. It is returned to the fuel tank via a return pipe.
  • this fuel injection device includes a pump section 1 including a passage for generating a pump action by an electromagnetic driving force and returning surplus fuel, a fuel injection valve 2 for injecting introduced fuel, and the like. It has.
  • the fuel injection valve 2 includes a poppet valve body 3 having a substantially conical sealing surface, a valve seat member 4 that supports the poppet valve body 3 in a reciprocating manner and defines a conical surface valve seat 4a, a valve seat A nozzle member 5 or the like is provided around the member 4 so as to define a passage 5a for assist air and a fuel injection port 5b at the tip. (For example, see Patent Document 1).
  • the injection port 5b has a cone shape in the direction in which the inner wall of the passage is curved and the tip approaches, the fuel that has passed through the injection port 5b is collected in the center, and therefore Although it is possible to prevent the fuel from scattering and adhering to the surrounding intake passage walls, etc., the particle size of the spray tends to increase, and it is difficult to atomize the atomized fuel (to reduce the particle size). To one.
  • the orifice plate is used in combination with a ball valve body or a one-dollar valve body, which has a small action that can pressurize (or pulsate) fuel. Therefore, the pulsation of the fuel due to the operation of the ball valve body or the one-dollar valve body is relatively small.Therefore, the atomized fuel to which the orifice plate force is also injected is effectively used by effectively utilizing the pulsation. It was difficult to promote soot (fine grain size).
  • Patent Document 1 JP 2005-16515 A
  • Patent Document 2 Japanese Patent Laid-Open No. 05-133306
  • Patent Document 3 Japanese Patent Laid-Open No. 06-229349
  • Patent Document 4 Japanese Patent Application Laid-Open No. 09-0104079
  • the present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is to achieve a simple structure while achieving weight reduction, cost reduction, size reduction, and the like. Prevents fuel from adhering to the inner wall of the intake passage, prevents fuel from dripping after fuel injection (during key-off), atomizes fuel, atomizes sprayed fuel (reduces particle size) To provide an electronically controlled fuel injection valve suitable for a small exhaust engine mounted on a motorcycle or the like. . Means for solving the problem
  • the fuel injection valve of the present invention includes a nozzle member that defines an injection port defined by a fuel passage and a concave space that is larger than the fuel passage, and a substantially conical seal that faces the upstream side of the fuel passage.
  • a poppet valve body having a surface and an end face facing downstream, and reciprocatingly opening and closing the fuel passage, and a panel for urging the poppet valve body in a valve closing direction.
  • the nozzle member includes a poppet valve body. On the downstream side, an orifice member that closes the injection port and defines an orifice having a smaller diameter than the injection port is provided.
  • the poppet valve body closes the fuel passage by the panel biasing force.
  • the poppet valve body opens, and the fuel injected into the downstream space of the poppet valve body collides with the orifice member and is injected through the orifice.
  • the poppet valve body generates a self-excited vibration having a minute amplitude due to the pressure fluctuation of the fuel, and pulsates the fuel guided to the downstream space between the end face and the orifice member. Due to this pulsation, atomization of the fuel injected by the orifice force is promoted, and atomization of the atomized fuel (reduction in particle diameter) is performed. That is, atomization of the atomized fuel (reduction in particle diameter) can be promoted while achieving a simplified structure.
  • the orifice member may have a plurality of orifices.
  • the orifice member is provided with a plurality of orifices, the fuel is injected from a plurality of locations, and atomization and particle size refinement are further promoted.
  • the orifice member has one orifice formed at a position corresponding to the axial center of the poppet valve element, and the end surface of the poppet valve element is inclined so that a central portion facing the orifice protrudes.
  • the structure formed so that a surface may be made can be adopted.
  • the orifice member has one orifice formed at a position corresponding to the axial center of the poppet valve body, and the inner diameter is divergent over a predetermined length on the downstream side of the orifice. It is possible to adopt a configuration including an injection passage formed so as to form a conical inner peripheral surface that gradually increases.
  • the injected fuel with a high flow velocity injected by the orifice is injected in the form of a liquid film having a conical surface along the conical inner peripheral surface of the injection passage. Compared to the above, it is possible to further promote atomization of the sprayed fuel.
  • the orifice member has a predetermined length with one orifice formed at a position corresponding to the axial center of the poppet valve body and an inner diameter discontinuous with the orifice on the downstream side of the orifice.
  • a configuration including a diameter-expanding wall formed over a wide area can be adopted. According to this structure, the atomized and atomized fuel injected from the orifice is prevented from being diffused by the enlarged diameter wall formed around the fuel. Therefore, it is possible to prevent the fuel from adhering to the inner wall surface of the intake passage.
  • the orifice member has one orifice formed at a position corresponding to the axial center of the poppet valve body, and the inner diameter is divergent over a predetermined length on the downstream side of the orifice.
  • Adopting a configuration that includes an injection passage formed to form a gradually increasing conical inner peripheral surface, and an enlarged wall formed concentrically outside the injection passage and longer than the injection passage can do.
  • the high-speed injected fuel injected by the orifice is injected in the form of a liquid film having a conical surface along the conical inner peripheral surface of the injection passage.
  • the atomization and atomization can be further promoted, and the atomized and refined fuel is prevented from diffusing by the enlarged diameter wall, and the fuel adheres to the inner wall surface of the intake passage. Can be prevented.
  • the orifice member has one orifice formed at a position corresponding to the axial center of the poppet valve body and a predetermined length formed on the downstream side of the orifice over a predetermined length.
  • a configuration including an injection passage formed and an assist air passage that opens to an inner wall surface of the injection passage and guides assist air can be employed.
  • the fuel atomized and atomized through the orifice is further agitated by the assist air guided through the assist air passage in the injection passage, and sprayed. Fuel atomization is further promoted.
  • the injection passage in which the assist air passage opens on the inner wall surface thereof is configured to have a conical inner peripheral surface in which the inner diameter gradually increases in a divergent shape. Can do.
  • the fuel injected from the orifice nozzle is injected in the form of a liquid film having a conical surface along the conical inner peripheral surface of the injection passage. Since the air is further agitated by the assist air guided through the passage, the atomized fuel spray is further promoted. [0014] In the configuration described above, a configuration in which the orifice member is fitted in a concave space that defines an injection port of the nozzle member can be employed.
  • the downstream space that is sandwiched between the end face of the poppet valve body and the orifice member and pulsates the fuel by the self-excited vibration with a small amplitude during fuel injection can be narrowed, and the fuel after the fuel injection It is possible to prevent the drooping caused by fuel accumulation during key-off.
  • the orifice member may employ a configuration that allows the poppet valve body to open and has a recess that defines the orifice in a region facing the end face of the poppet valve body.
  • the downstream space between the end face of the poppet valve body and the orifice member and the pulsation of the fuel can be narrowed by the self-excited vibration with a small amplitude at the time of fuel injection, and therefore at the time of key-off after fuel injection. It is possible to prevent the drooping caused by the accumulation of fuel, and the lower space can be formed to have an optimum volume by appropriately setting the depth of the recess.
  • the orifice member has an annular inner fitting portion that is fitted in a concave space that defines an injection port of the nozzle member, and an annular outer fitting that is fitted on the outer peripheral edge of the nozzle member.
  • the structure which has a part can be employ
  • the downstream space between the end face of the poppet valve body and the orifice member and the pulsation of the fuel can be narrowed by the self-excited vibration with a small amplitude at the time of fuel injection. It is possible to prevent the drooping caused by the accumulation of fuel, and the lower space can be formed to have an optimum volume by appropriately setting the depth of the recess. Furthermore, since the orifice member is connected (fitted) to the tip of the nozzle member via the inner fitting part and the outer fitting part, a sufficient bonding area can be secured and the bonding (fitting) can be performed more firmly. Can do.
  • the fuel injection valve of the present invention having the above-described configuration, it is possible to prevent the fuel from adhering to the inner wall surface of the intake passage, etc., with a simple structure. Dripping can be prevented, fuel atomization, atomization (reduction in particle size), etc. are performed reliably, and operating performance As a result, stable fuel injection can be performed while ensuring the above, and an electronically controlled fuel injection valve suitable for a small displacement engine mounted on a motorcycle or the like can be obtained.
  • FIG. 1 is a cross-sectional view showing a conventional fuel injection valve.
  • FIG. 2 is a cross-sectional view showing an electronically controlled fuel injection device equipped with a fuel injection valve according to the present invention.
  • FIG. 3 is a partial sectional view showing a part of the fuel injection valve shown in FIG.
  • FIG. 4 is a partial sectional view showing another embodiment of the fuel injection valve according to the present invention.
  • FIG. 5 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 6 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 7 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 8 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 9 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 10 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 11 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • FIG. 12 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention. Explanation of symbols
  • FIG. 2 shows an embodiment of an electronically controlled fuel injection device provided with a fuel injection valve according to the present invention
  • FIG. 3 is an enlarged sectional view of a part of the fuel injection valve.
  • this fuel injection device includes a plunger pump 100 that is driven by electromagnetic force to pump fuel and a fuel injection valve 200 that injects fuel pressurized to a predetermined pressure or higher. It has been.
  • the plunger pump 100 is disposed outside the cylinder 102, a plunger 102 that reciprocates in a substantially vertical direction, a cylinder 102 that slidably accommodates the plunger 101, and a cylinder 102.
  • the plunger 101 is formed by a reduced diameter portion and an enlarged diameter portion, and the inside is thinned. Then, due to the electromagnetic driving force generated by energization of the coil 107, the plunger 101 moves downward to perform the pressure feeding process of the fuel. When the coil 107 is not energized, the plunger 101 is energized by the return spring 105 and pushed back upward. At the same time, a fuel suction stroke is performed.
  • a guide passage 104a is formed in the lower yoke 104 so that the tip of the plunger 101 is slidable.
  • a side surface of the guide passage 104a includes a fuel supply passage 108a.
  • a supply port 104b for supplying fuel to the pumping chamber C and a reflux port 104c for circulating the fuel in the pumping chamber C are formed.
  • a return passage 111 is formed between the outside of the lower yoke 104 and the upper yoke 103 and the bobbin 106 to return the excess fuel in communication with the fuel supply passage 108a and the reflux port 104c.
  • the first valve body 109 allows the fuel having a predetermined pressure or higher in the fuel supply passage 108a to flow into the pumping chamber C from the supply port 104b, while guiding excess fuel to the return passage 111, and the second valve.
  • the body 110 causes the fuel in the pumping chamber C to have a pressure equal to or higher than a predetermined pressure to flow out from the return port 104c to the return passage 111.
  • the fuel injection valve 200 has a nozzle member 210, a ball valve body 220 that allows only fuel discharge from the pumping chamber C, and a direction in which the ball valve body 220 is closed.
  • Coupling panel 230 that is energized
  • poppet valve body 240 that opens when the fuel is above a predetermined pressure
  • coil panel 250 that energizes the poppet valve body 240 in the closing direction
  • tip of nozzle member 210 An orifice member 260 and the like are provided.
  • the nozzle member 210 accommodates the coil panel 250 and the fuel passage 210a through which the fuel passes, and the fuel passage 210b through which the poppet valve body 240 guides the reciprocating motion and allows the fuel to pass therethrough.
  • the conical valve seat 210c on which the poppet valve body 240 is seated is formed with an inner diameter larger than the inner diameter of the fuel passage 210b and opens at the tip (that is, defined by a concave space larger than the fuel passage 210b). ) Shaped to demarcate the injection port 210d etc. It is made.
  • the nozzle member 210 cooperates with the orifice member 260 between the valve seat 210c and the injection port 210d to define the downstream space 211 that allows the movement of the poppet valve body 240 and accumulates fuel. .
  • the poppet valve body 240 has a flange 241 with which one end of the coil panel 250 abuts, a shaft 242 integrally formed below the flange 241, and a shaft 242 and a guided shaft 243 that is slidably guided in the fuel passage 210b and has a cut surface that allows the passage of fuel, and is formed integrally on the downstream side of the guided shaft 243.
  • a valve portion 244 and the like Provided with a valve portion 244 and the like.
  • the valve section 244 has a seat surface 244a formed in a substantially conical shape toward the upstream side of the fuel passage 210b, and substantially flat toward the downstream side of the fuel passage 210b. It is formed in a substantially truncated cone shape so as to define the formed end face 244b.
  • the seat surface 244a of the poppet valve body 240 is seated (closely attached) to the valve seat 210c by the coil node 250 disposed in a compressed state in the fuel passage 210a.
  • the pressure of the fuel guided to the fuel passage 210b becomes equal to or higher than a predetermined level, as shown by a two-dot chain line in FIG.
  • the seat surface 244a opens away from the valve seat 210c! /.
  • the coil panel 250 is attached at a predetermined compression allowance, and when the pressure of the fuel introduced into the fuel passages 210a and 210b does not exceed a predetermined level, the poppet valve body 240 maintains the closed state. On the other hand, the poppet valve body 240 is set to open when the pressure of the fuel introduced into the fuel passages 210a and 210b is above a predetermined level.
  • the poppet valve body 240 is configured to generate a self-excited vibration with a minute amplitude due to the relationship between the biasing force of the coil panel 250 and the fuel pressure, that is, the fuel pressure fluctuation.
  • the poppet valve body 240 When the poppet valve body 240 generates self-excited vibration, it pulsates the fuel guided to the downstream space 211 between the end surface 244b and the orifice member 260! /.
  • the orifice member 260 includes an annular fitting portion 260a that is fitted (fitted) to the outer peripheral edge portion of the nozzle member 210, and an inner portion of the fitting portion 260a.
  • symmetry line symmetry or point
  • the orifice member 260 is coupled (fitted) to the tip of the nozzle member 210 so as to close the injection port 210d.
  • one orifice 261 may be provided at a position corresponding to the force center axis L (the axis center of the poppet valve body 240) showing the case where a plurality of orifices 261 are employed.
  • the orifice member 260 cooperates with the nozzle member 210 to form a downstream space 211 that allows the movement of the poppet valve body 240 and the accumulation of fuel on the downstream side of the poppet valve body 240. It is formed to define.
  • the orifice member 260 corresponds to the distance D from the end face 244b of the poppet valve body 240 to the orifice 261, the capacity V of the downstream space 211, the number of the orifices 261, depending on the fuel injection conditions of the engine to be applied.
  • the position of the orifice 261 is appropriately selected.
  • a distance D of 0.2 mm or less and a capacity V of about lmm 3 can be used.
  • the poppet valve body 240 closes the fuel passage 210b by the biasing force of the coil panel 250
  • the poppet valve body 240 Is opened, and the fuel injected into the downstream space 211 of the poppet valve body 240 collides with the orifice member 260 and is injected through the plurality of orifices 261.
  • the poppet valve body 240 generates self-excited vibration with a minute amplitude due to the pressure fluctuation of the fuel, and pulsates the fuel guided to the downstream space 211 between the end surface 244b and the orifice member 260. Due to this pulsation, the fuel injected from the orifice 261 is injected at a changed speed, so that atomization and atomization of the atomized fuel (particle size reduction) are performed. In other words, atomization of the atomized fuel (miniaturization of particle size) can be promoted while achieving simplification of the structure.
  • the plunger pump 100 an electromagnetic force is generated when the coil 107 is energized.
  • the plunger 101 in the upper rest position starts to move downward against the urging force of the return spring 105, and starts the pumping stroke while pressurizing the fuel in the pumping chamber C.
  • the second valve body 110 is opened when the pumped fuel exceeds a predetermined pressure (pressurization), and the fuel mixed with vapor is discharged toward the return passages 111 and 107a. Is done.
  • the plunger 101 starts to move upward due to the urging force of the return spring 105.
  • the first valve body 109 is opened to start the suction stroke, and the fuel in the fuel supply passage 108a is sucked into the pressure feeding chamber C.
  • the vapor mixed in the fuel is positively separated by a vapor separation filter (not shown) and discharged toward the return passage 111.
  • the ball valve body 220 is opened, and the pressurized fuel force coil panel 250 is opened.
  • the poppet valve body 240 is opened against the urging force and simultaneously discharged through the fuel passages 210a and 210b into the downstream space 211.
  • the poppet valve body 240 generates self-excited vibration due to the pressure fluctuation of the fuel, and the fuel filled in the downstream space 211 is pulsated by the self-excited vibration. Then, since the fuel injected from the orifice 261 changes in speed, atomization of the atomized fuel is promoted simultaneously with the atomization of the fuel.
  • FIG. 4 is a partial cross-sectional view showing another embodiment of the fuel injection valve according to the present invention.
  • a part of the poppet valve body and the orifice member are changed with respect to the embodiment shown in FIG.
  • the orifice member 260 is formed so as to define one orifice 261 at a position corresponding to the poppet valve body 24 (the axis center (center axis L) of the rod).
  • FIG. 5 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • the orifice member is different from the embodiment shown in FIG. has been edited.
  • the orifice member 360 is formed into an annular fitting portion 360a that is fitted (fitted) to the outer peripheral edge portion of the nozzle member 210, and a flat plate inside the fitting portion 360a.
  • One orifice 361 arranged at a position corresponding to the axis center (center axis L) of the poppet valve body 240 in the region, and the inner diameter gradually increases in a divergent shape over a predetermined length on the downstream side of the orifice 361
  • An injection passage 362 having a conical inner peripheral surface is defined.
  • the orifice member 360 is coupled (fitted) to the tip end of the nozzle member 210 so as to close the injection port 210d.
  • the high-velocity injected fuel injected by the orifice 361 is injected in the form of a conical liquid film along the conical inner peripheral surface of the injection passage 362. Therefore, atomization of the atomized fuel can be further promoted as compared with the case where the fuel is simply injected from the orifice.
  • the inclination angle of the injection passage 362 is set to an angle that generates a cavity to actively promote the generation of bubbles and to mix the bubbles. It is also possible to promote atomization of the atomized fuel.
  • the material of the orifice member 360 it is preferable to apply a material that can withstand corrosion due to the cavity.
  • FIG. 6 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • an orientation is compared with the embodiment shown in FIG. The chair member has been changed.
  • Orifice member 460 as shown in FIG. 6, an annular fitting portion 460a that is fitted (fitted) to the outer peripheral edge portion of the nozzle member 210, and a region formed in a flat plate shape inside the fitting portion 460a
  • one orifice 461 disposed at a position corresponding to the axis center (center axis L) of the poppet valve body 240, and a larger inner diameter discontinuous with the orifice 461 on the downstream side of the orifice 461 And is formed so as to define a cylindrical expanded diameter wall 463 over a predetermined length.
  • the orifice member 460 is coupled (fitted) to the tip of the nozzle member 210 so as to close the injection port 210d.
  • this fuel injection valve According to this fuel injection valve, the atomized and atomized fuel injected from the orifice 461 is prevented from diffusing by the cylindrical enlarged wall 463 formed around the atomized fuel. Therefore, when this fuel injection valve is applied to the intake pipe of the engine, it is possible to prevent the fuel from adhering to the inner wall surface of the intake passage.
  • FIG. 7 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • an orientation is compared with the embodiment shown in FIG. The chair member has been changed.
  • the orifice member 560 is formed into an annular fitting portion 560a that is fitted (fitted) to the outer peripheral edge portion of the nozzle member 210, and a flat plate inside the fitting portion 560a.
  • One orifice 561 arranged at a position corresponding to the axis center (center axis L) of the poppet valve body 240 in the region, and the inner diameter gradually increases in a divergent shape over a predetermined length on the downstream side of the orifice 561
  • An injection passage 562 having a conical inner peripheral surface and an enlarged diameter wall 563 that is concentric and longer than the injection passage 562 outside the injection passage 562 are formed.
  • the orifice member 560 has a nozzle so as to block the injection port 210d. It is coupled (fitted) to the tip of the member 210.
  • the fast injected fuel injected by the orifice 561 is injected in the form of a conical liquid film along the conical inner peripheral surface of the injection passage 562. Therefore, atomization of the atomized fuel can be further promoted as compared with the case where the fuel is simply injected from the orifice. Further, the fuel atomized and refined through the injection passage 562 is prevented from diffusing by a cylindrical enlarged wall 563 formed around the fuel spray. Therefore, when this fuel injection valve is applied to the intake pipe of the engine, it is possible to prevent the fuel from adhering to the inner wall surface of the intake passage.
  • FIG. 8 is a partial sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • the orifice member is different from the embodiment shown in FIG. has been edited.
  • the orifice member 660 is formed into an annular fitting portion 660a that is fitted (fitted) to the outer peripheral edge portion of the nozzle member 210, and a flat plate inside the fitting portion 660a.
  • One orifice 661 arranged at a position corresponding to the axis center (center axis L) of the poppet valve body 240 in the region, and a predetermined inner diameter formed over a predetermined length on the downstream side of the orifice 661
  • a cylindrical injection passage 662 formed, and a plurality of assist air passages 664 that open to the inner wall surface of the injection passage 662 and guide the assist air are formed.
  • the assist air passage 664 communicates with the assist air passage 664 formed on the upstream side.
  • the orifice member 660 is coupled (fitted) to the tip of the nozzle member 210 so as to close the injection port 210d.
  • FIG. 9 is a modification in which the injection passage of the fuel injection valve shown in FIG. 8 is changed. That is, in this embodiment, the injection passage 662 ′ of the orifice member 660 is formed so as to form a conical inner peripheral surface whose inner diameter gradually increases in a divergent shape.
  • the fuel injected from the orifice 661 is injected in the form of a liquid film having a conical surface along the conical inner peripheral surface of the injection passage 662, and further assists in the injection passage 662. Since the agitation is further performed by the assist air guided through the air passage 664, atomization of the atomized fuel is further promoted.
  • the angle of inclination of the injection passage 662 ′ that is, the conical inner peripheral surface is set to an angle that generates a cavity, and the generation of bubbles is positively promoted. You may promote wrinkles.
  • the material of the orifice member 660 it is preferable to apply a material that can withstand corrosion due to the cavity.
  • FIG. 10 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • the nozzle member and the orifice member are changed with respect to the embodiment shown in FIG.
  • the injection port 210d is defined so as to have an inner diameter larger than the inner diameter and open at the tip (that is, defined by a concave space larger than the fuel passage 210).
  • the orifice member 760 includes an annular fitting portion 760a that is fitted (fitted) into a concave space that defines an injection port 210d of the nozzle member 210, and a flat plate inside the fitting portion 760a. And a plurality of orifices 761 arranged symmetrically (line symmetric or point symmetric) with respect to the axial center (central axis L) of the poppet valve body 240 in the region formed in a shape. Yes.
  • the orifice member 760 is coupled to (inserted into) the tip of the nozzle member 210 so as to block the injection port 210d.
  • the poppet valve body 240 is allowed to move and a minute amount is injected during fuel injection.
  • a downstream space 211 that pulsates the fuel by self-excited oscillation of amplitude is defined.
  • the lower space 211 is defined to be smaller than that in the above-described embodiment, it is possible to prevent the sag caused by the accumulation of fuel at the time of key-off after fuel injection.
  • FIG. 11 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • the orifice member is changed with respect to the embodiment shown in FIG.
  • the poppet valve body 240 In the region facing the end face of 240, the poppet valve body 240 is depressed downward to allow the valve to open, and the axis of the poppet valve body 240 (center axis) is formed in the recess 860b and the bottom region formed in a flat plate shape in the recess 860b.
  • L and a plurality of orifices 861 arranged at positions symmetrical (line symmetry or point symmetry).
  • the orifice member 860 is coupled to (inserted into) the tip of the nozzle member 210 so as to close the injection port 210d.
  • the poppet valve body 240 is allowed to move in a narrow space defined by the end face of the valve portion 244, the fuel passage 210 and the concave portion 860b of the orifice member 860, and at the time of fuel injection, a small amplitude is automatically detected.
  • a downstream space 211 that pulsates the fuel by excitation vibration is defined.
  • the lower space 211 is defined to be small, so that it is possible to prevent a sag caused by fuel accumulation during key-off after fuel injection. Further, the lower space 211 can be formed to have an optimal volume by appropriately setting the depth of the recess 860b.
  • FIG. 12 is a partial cross-sectional view showing still another embodiment of the fuel injection valve according to the present invention.
  • the orifice member is changed with respect to the embodiment shown in FIG.
  • the injection port 210d of the nose and the nodule material 210 is defined.
  • annular outer fitting portion 960c that is fitted (fitted) to the outer peripheral edge portion of the tip of the nozzle member 210, and the axial center of the poppet valve body 240 in the bottom region formed in a flat plate shape in the concave portion 960b ( It is formed so as to define a plurality of orifices 961 arranged at positions symmetrical with respect to the central axis L) (line symmetry or point symmetry).
  • the orifice member 960 is coupled to (inserted into) the tip of the nozzle member 210 so as to close the injection port 210d.
  • the poppet valve body 240 is allowed to move in a narrow space defined by the end face of the valve portion 244 and the concave portion 960b of the orifice member 960, and the fuel pulsates due to self-excited vibration with a small amplitude during fuel injection.
  • a downstream space 211 is provided to provide
  • the lower space 211 is defined to be small, so that it is possible to prevent the sag caused by fuel accumulation during key-off after fuel injection. Further, the lower space 211 can be formed to have an optimal volume by appropriately setting the depth of the recess 960b.
  • the orifice member 960 is coupled (fitted) to the tip of the nozzle member 210 via the inner fitting portion 960a and the outer fitting portion 960c, a sufficient bonding area can be secured and the rigidity can be further increased. Can be joined (fitted).
  • the force shown when the plunger pump 100 is combined as the drive unit of the fuel injection device including the fuel injection valve 200 of the present invention is not limited to this.
  • the fuel injection valve of the present invention may be employed in combination with other drive units.
  • the orifice member 260 defining the plurality of orifices 261 is combined with the poppet valve body 240 in which the end face 244b is formed to be substantially flat has been shown, but the present invention is not limited to this.
  • an orifice member having one orifice formed at a position corresponding to the axis center (center axis L) may be combined.
  • the fuel injection valve of the present invention has achieved miniaturization, simplification of structure, and the like.
  • it is possible to prevent fuel from adhering to the inner wall surface of the intake passage, etc., and to prevent sag after fuel injection (during key-off), atomization of fuel, atomization of atomized fuel (reduction of particle size), etc. Therefore, it can be used as a fuel injection valve for engines with small displacements mounted on motorcycles, etc., as well as on engines that do not require miniaturization, vehicles other than motorcycles, or other machines. It is also useful as a fuel injection valve for an engine.

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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

L'invention concerne une soupape d'injection de carburant ayant un corps de soupape en champignon (240), un ressort hélicoïdal (250), et un organe de type injecteur (210). Le corps de soupape en champignon (240) a une surface d'étanchéité sensiblement circulaire et conique (244a) qui fait face au côté en amont et également une surface d'extrémité (244b) faisant face au côté en aval, et le corps de soupape en champignon (240) décrit un mouvement de va-et-vient dans un passage de carburant (210b) d'une manière permettant l'ouverture/la fermeture. Le ressort hélicoïdal (250) sollicite le corps de soupape en champignon (240) dans une direction de fermeture de soupape. L'organe de type injecteur (210) reçoit le corps de soupape en champignon (240), définit les passages de carburant (210a, 210b) et une ouverture d'injection (210d), et est muni d'un organe de type orifice (260) pour fermer l'ouverture d'injection (210d) et définir un orifice (261) ayant un diamètre inférieur à l'ouverture d'injection (210d). Une vibration auto-induite du corps de soupape en champignon (240) causée par une variation de la pression du carburant exerce une pulsation sur le carburant ayant été acheminé jusque dans un espace côté en aval (211) entre la surface d'extrémité (244b) et l'organe de type orifice (260), ceci désintégrant plus encore le carburant pulvérisé.
PCT/JP2007/051969 2006-02-07 2007-02-06 Soupape d'injection de carburant WO2007091536A1 (fr)

Priority Applications (1)

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JP2007557838A JPWO2007091536A1 (ja) 2006-02-07 2007-02-06 燃料噴射弁

Applications Claiming Priority (2)

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JP2006-029161 2006-02-07
JP2006029161 2006-02-07

Publications (1)

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WO2007091536A1 true WO2007091536A1 (fr) 2007-08-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012007529A (ja) * 2010-06-24 2012-01-12 Toyota Motor Corp 燃料噴射弁
WO2012086005A1 (fr) * 2010-12-20 2012-06-28 トヨタ自動車株式会社 Injecteur de carburant
JP2015224618A (ja) * 2014-05-29 2015-12-14 トヨタ自動車株式会社 燃料噴射弁
DE102016219782A1 (de) * 2016-10-12 2018-04-12 Ford Global Technologies, Llc Variabel einstellbares Tellerventil
CN109983218A (zh) * 2016-11-21 2019-07-05 罗伯特·博世有限公司 具有三件式阀座的喷射器

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JP2004211682A (ja) * 2002-12-17 2004-07-29 Denso Corp 燃料噴射装置
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JPH05164019A (ja) * 1991-12-10 1993-06-29 Nippon Injiekuta Kk 燃料噴射装置
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JP2012007529A (ja) * 2010-06-24 2012-01-12 Toyota Motor Corp 燃料噴射弁
WO2012086005A1 (fr) * 2010-12-20 2012-06-28 トヨタ自動車株式会社 Injecteur de carburant
CN103261662A (zh) * 2010-12-20 2013-08-21 丰田自动车株式会社 燃料喷射阀
JP2015224618A (ja) * 2014-05-29 2015-12-14 トヨタ自動車株式会社 燃料噴射弁
DE102016219782A1 (de) * 2016-10-12 2018-04-12 Ford Global Technologies, Llc Variabel einstellbares Tellerventil
CN109983218A (zh) * 2016-11-21 2019-07-05 罗伯特·博世有限公司 具有三件式阀座的喷射器
JP2019535953A (ja) * 2016-11-21 2019-12-12 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ ３つの構成要素から成る弁座を含む噴射器
CN109983218B (zh) * 2016-11-21 2021-12-14 罗伯特·博世有限公司 具有三件式阀座的喷射器
US11519374B2 (en) 2016-11-21 2022-12-06 Robert Bosch Gmbh Injector having a tripartite valve seat

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