EP1681459B1 - Kraftstoffzufuhrvorrichtung, fahrzeug und kraftstoffzufuhrvorrichtungsmontageverfahren - Google Patents

Kraftstoffzufuhrvorrichtung, fahrzeug und kraftstoffzufuhrvorrichtungsmontageverfahren Download PDF

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Publication number
EP1681459B1
EP1681459B1 EP04799485A EP04799485A EP1681459B1 EP 1681459 B1 EP1681459 B1 EP 1681459B1 EP 04799485 A EP04799485 A EP 04799485A EP 04799485 A EP04799485 A EP 04799485A EP 1681459 B1 EP1681459 B1 EP 1681459B1
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EP
European Patent Office
Prior art keywords
injector
fuel
chamber
air
fuel supply
Prior art date
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Application number
EP04799485A
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English (en)
French (fr)
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EP1681459A1 (de
EP1681459A4 (de
Inventor
Tsugunori YAMAHA HATSUDOKI KK KONAKAWA
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Yamaha Motor Co Ltd
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Yamaha Motor Co Ltd
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Publication of EP1681459A4 publication Critical patent/EP1681459A4/de
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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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/043—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit upstream of an air throttle valve
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10039—Intake ducts situated partly within or on the plenum chamber housing
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10052—Plenum chambers special shapes or arrangements of plenum chambers; Constructional details
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10177—Engines having multiple fuel injectors or carburettors per cylinder
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/162—Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve

Definitions

  • the present invention relates to a fuel supply device that supplies a fuel to an engine, a vehicle provided with the same, and an assembly method of a fuel supply device.
  • the prior art document JP 10 205410 A teaches a fuel supply device for an engine, wherein a fuel injector is arranged adjacent to an air intake passage which is provided to connect the air intake port of the engine with an air intake means. Said fuel injector is arranged to face the air intake port of the engine, such that a fuel spray body is directed to said intake port of the engine. According to a specific embodiment that can be taken from said prior art document, said fuel injector is arranged within a separate chamber such that only the tip section of said fuel injector is extending into the air intake passage.
  • the prior art document JP 58-035266 A teaches an intake chamber means with a fuel injector arranged in a separate compartment.
  • Said chamber means comprises a chamber element integrally formed with an intake passage for connecting with an engine.
  • Said separate compartment for accommodating the fuel injector is constituted by a respective chamber element welded or pasted to the integral shape chamber element. After assembling of said fuel injector support element a sealing cover is attached to the chamber element for closing same.
  • a fuel injector is arranged upstream of an opening of an intake pipe in an intake box (see, for example, Patent Documents 1 and 3).
  • the fuel injector is arranged substantially in parallel to an axis of the intake pipe.
  • said objective is solved by a fuel supply device for an engine having the features of independent claim 1. Preferred embodiments are laid down in the dependent claims. Moreover, said objective is also solved by a method of assembling a fuel supply device having the features of independent claim 10.
  • a fuel supply device which comprises an intake chamber having an introducing portion for introduction of an air, an intake passage having an opening opened to the intake chamber and guiding an air in the intake chamber from the opening to an engine, a compartment member to form a separate chamber inside the intake chamber, and an injector having an injector body and a nozzle, at least the injector body being accommodated within the separate chamber, the injector acting to inject a fuel between the introducing portion in the intake chamber and the opening.
  • a further fuel supply device which comprises an intake chamber having an introducing portion for introduction of an air, a plurality of intake passages each having an opening opened to the intake chamber and guiding an air in the intake chamber from the opening to an engine, a compartment member to form a separate chamber inside the intake chamber, and a plurality of injectors each having an injector body and a nozzle, and acting to inject a fuel between the introducing portion in the intake chamber and the respective openings, and at least the injector bodies of the plurality of injectors are accommodated together within the separate chamber.
  • a method of assembling a fuel supply device which fuel supply device comprises an intake chamber box having a first case, and a second case joined to the first case to cooperate therewith to compartment an intake chamber, an intake passage having an opening opened to the intake chamber and guiding an air in the intake chamber from the opening to an engine, a compartment member to form a separate chamber inside the intake chamber, and an injector having an injector body and a nozzle, at least the injector body being accommodated within the separate chamber, the injector acting to inject a fuel between the introducing portion in the intake chamber and the opening, comprises the steps of mounting the compartment member to an inner surface of the first case while arranging the injector between the inner surface of the first case and the compartment member, or arranging the injector inside the compartment member, and assembling the first case, to which the compartment member is mounted, and the second case.
  • the injector body is accommodated in the separate chamber, the injector body is not exposed to an air flow in the intake chamber, so that air resistance caused by the injector is decreased. Besides, since the fuel injector is accommodated inside the intake chamber, the waterproof quality is improved.
  • a fuel supply device in which a fuel is injected upstream of an opening of an intake passage, can be improved in waterproof quality while air resistance caused by an injector is suppressed.
  • Fig. 1 is a side view showing an example of a vehicle according to an embodiment of the invention.
  • the vehicle according to the embodiment comprises a motorcycle (including motorbike, scooter, etc.) 100.
  • a left side corresponds to a front side of the vehicle and a right side corresponds to a rear side of the vehicle.
  • the motorcycle 100 comprises an inlet port 81 for introduction of an air, an air cleaner 10, an engine 21, and a muffler 84.
  • the engine 21 in the embodiment comprises a water-cooled four-cycle parallel four-cylinder engine.
  • the inlet port 81 and the air cleaner 10 are connected to each other through an intake duct 82.
  • the air cleaner 10 and a combustion chamber 2c (not shown in Fig. 1 . see Fig.
  • the combustion chamber 2c and the muffler 84 are connected to each other through an exhaust passage 83.
  • An upstream-side fuel injector 14 is arranged inside the air cleaner 10 and a downstream-side fuel injector 13 is arranged in the intake passage 90.
  • an air sucked from the inlet port 81 is led to the air cleaner 10 through the intake duct 82.
  • An air purified by the air cleaner 10 and a fuel injected from the fuel injector 14 are sucked into the intake passage 90.
  • a fuel is further injected into the intake passage 90 from the fuel injector 13.
  • An air and a fuel in the intake passage 90 are fed to the combustion chamber 2c in the suction stroke of the engine 21.
  • the air and the fuel fed to the combustion chamber 2c are compressed in the compression stroke, burned in the combustion stroke, and forwarded into the exhaust passage 83 in the exhaust stroke. Exhaust gases forwarded into the exhaust passage 83 are exhausted outside from the muffler 84.
  • an upstream in a flow direction of an air supplied to the combustion chamber 2c of the engine 21 through the air cleaner 10 and the intake passage 90 from the inlet port 81 is simply referred to as upstream and a downstream in the flow direction is simply referred to as downstream.
  • a recess to form a part of the combustion chamber 2c is formed in a cylinder head 2 of the engine 21.
  • the engine 21 is mounted in a forward tilting position or an upright position relative to a vehicle frame, and a cylinder bore axis B of the engine 21 forms an angle of 0 to 50 degrees relative to a plumb line V.
  • an intake valve and an exhaust valve are opened and closed by an intake cam shaft and an exhaust cam shaft.
  • the intake valve opening 2d is formed at a downstream end of an intake port 2e, and an outside connection port 2f is formed at an upstream end of the intake port 2e.
  • a cylindrical-shaped throttle body 7 is connected to the outside connection port 2f through a cylindrical-shaped joint member 6.
  • an air funnel 8 is connected to an upstream end of the throttle body 7.
  • the air funnel 8, the throttle body 7, the joint member 6, and the intake port 2e define the intake passage 90 having a straight center line A.
  • the center line A forms an angle of 20 to 50 degrees relative to the cylinder bore axis B.
  • the joint member 6 is cylindrical-shaped and made of heat-resisting rubber, and a lower-end flange (not shown) of the joint member 6 is bolted and fixed to a peripheral edge of the outside connection port 2f of the cylinder head 2.
  • a downstream opening of the throttle body 7 is inserted into an upper-end connection port of the joint member 6, and the joint member 6 and the throttle body 7 are clamped and fixed together by a fixing band 6b.
  • the throttle body 7 is cylindrical-shaped and a throttle valve 9 is arranged midway in a lengthwise direction of the throttle body.
  • the throttle valve 9 comprises a valve shaft 9a extending through the throttle body 7 in a direction (referred to as cam shaft direction) in parallel to the cam shaft, and a valve disk 9b fixed to the valve shaft 9a.
  • cam shaft direction a direction in parallel to the cam shaft
  • valve disk 9b fixed to the valve shaft 9a.
  • the valve shaft 9a is connected to an adjacent valve shaft of the throttle valve by a connection body.
  • a throttle pulley is mounted on the connection body, and the throttle pulley is connected to a throttle grip of a steering handle through a throttle cable.
  • the air funnel 8 is connected to the throttle body 7 through a joint member 6'.
  • the air funnel 8 is opened into the air cleaner 10.
  • the air cleaner 10 comprises a box-shaped air-cleaner case 11 extending in a vehicle-width direction (cam shaft direction).
  • An intake chamber is defined inside the air-cleaner case 11 and an element 12 is arranged in the intake chamber.
  • the air-cleaner case 11 is of a vertical split type to comprise a lower case 11a and an upper case 11b.
  • Flanges 11e, 11f, respectively, are formed at peripheral edges of split surfaces of the lower case 11a and the upper case 11b, and the flanges 11e, 11f are fixed together by means of fasteners such as vis, screw, bolt, etc.
  • the lower case 11a is compartmented into a front portion (a right portion in Fig. 2 ) and a rear portion (a left portion in Fig. 2 ).
  • the front portion of the lower case 11a expands downward in size, and an expansion portion 11i is formed at a side wall thereof with an air inlet 11c'.
  • the rear portion of the lower case 11a comprises a downwardly expanded outlet 11d.
  • the outlet 11d mounts to a bottom surface thereof four sets of air funnels 8 of the respective cylinders.
  • the respective air funnels 8 are fitted into the connection ports of the throttle bodies 7 of the respective cylinders when the air cleaner 10 is arranged in a predetermined position.
  • the upper case 11b is substantially arcuate-shaped in a cross section extending from the front portion to a rear wall 11g. Since the upper case 11b is arcuate-shaped in this manner, a necessary volume is ensured on a secondary side (downstream of the element 12) of the element 12.
  • a main flow of an air sucked from the air inlet 11c' is led to the air funnels 8 such that a center line M of the flow assumes an arcuate shape as shown in Fig. 2 .
  • the downstream-side fuel injectors 13 are arranged every cylinder on downstream sides of the throttle valves 9 of the respective throttle bodies 7, and the upstream-side fuel injectors 14 are arranged every cylinder on upstream sides.
  • a boss to support the fuel injector 13 is formed on a rear wall of the throttle body 7, that is, a wall positioned on an opposite side of the center line A of the intake passage to the cylinder bore axis B.
  • the respective fuel injectors 13 are fixed in a state of being inserted into the bosses.
  • Fuel introduction portions 13b are provided on upper ends of the respective fuel injectors 13, the respective fuel introduction portions 13b being connected to pipes 17a branching off a fuel supply pipe 17.
  • the fuel supply pipe 17 extends in the cam shaft direction and is common to the respective fuel injectors 13.
  • the reference numeral 13c denotes nozzles of the fuel injectors 13.
  • the throttle body 7 comprises a diaphragm type cushion valve 19 on an upstream side of the throttle valve 9.
  • a piston valve 19a to increase or decrease an area of the intake passage is biased toward a closed side.
  • the piston valve 19a is connected to a diaphragm 19b to introduce into a diaphragm chamber 19c negative pressure in the intake passage 90.
  • the piston valve 19a opens the intake passage 90 a little later to adjust an increase in air quantity to an increase in fuel injection quantity whereby it is possible to achieve a smooth increase in rotation of the engine.
  • the upstream-side fuel injectors 14 are arranged inside (toward a center of the arcuate shape) the center line M of the main flow within the air-cleaner case 11.
  • the respective fuel injectors 14 are supported on a cylindrical-shaped support bracket 15" .
  • the support bracket 15" comprises a vertical wall 15a extending lengthwise of the fuel injectors 14.
  • the vertical wall 15a has the function of leading the air flow M to the air funnels 8.
  • the support bracket 15" extends through left and right side walls of the air-cleaner case 11 (see Fig. 3 ).
  • the extending-through portions are interposed by flanges of the lower case 11a and the upper case 11b and sealed so as not to prevent an outside air from entering the air cleaner.
  • the fuel injectors 14 comprise an injection nozzle 14c and an injector body (a portion except the injection nozzle 14c).
  • the injector body is fixed in a state of being inserted into a boss 15d of the support bracket 15", and the injection nozzle 14c projects downward from the support bracket 15".
  • the support bracket 15" defines a separate chamber 68 in the air cleaner 10 to be compartmented from the intake chamber.
  • the injector bodies of the fuel injectors 14 are accommodated inside the separate chamber 68.
  • a common fuel supply pipe 16 is connected to an upper end of the respective fuel injectors 14.
  • the respective fuel injectors 14 are connected to pipes 16a branching off the fuel supply pipe 16 within the separate chamber 68. As shown in Fig. 3 , an end of the fuel supply pipe 16 projects outside the air-cleaner case 11, and the projecting portion is connected to a fuel supply pump (not shown).
  • the respective fuel injectors 14 are connected to electric power supply harnesses 14e within the separate chamber 68. Although illustration is omitted, four sets of electric power supply harnesses 14e in a bundled state extend through the air-cleaner case 11 to be led outside. Provided on the led ends is a connection connector.
  • the four fuel injectors 14 along with the fuel supply pipe 16 and the electric power supply harnesses 14e are mounted to the support bracket 15" to be made integral as an injector unit.
  • the injector unit is arranged in the air cleaner 10 (more specifically, within the separate chamber 68 compartmented by the support bracket 15") .
  • a joint of the fuel supply pipe 16 and the connector connected to edges of the harnesses 14e are connected to external circuits outside the air cleaner 10.
  • the air funnels 8 are tapered in shape with a suction side thereof being slightly large in diameter, and tip ends of the air funnels 8 are formed by a bellmouth.
  • the bellmouth forms a separation layer inducing portion 8a, which is provided by arcuately outwardly bending a peripheral edge of a suction port 8b (see Fig. 4 ).
  • the separation layer inducing portion 8a is structured such that a separation layer a of an air flow sucked into the throttle body 7 through the air funnel 8 is positively formed on an inner surface of the air funnel 8.
  • the separation layer inducing portion 8a defines an arcuate curved surface, of which a radius of curvature r in the air flow direction is in the order of 0.33 to 0.01xD where D indicates a diameter of the suction port 8b of the air funnel 8.
  • a radius of curvature r in the air flow direction is in the order of 0.33 to 0.01xD where D indicates a diameter of the suction port 8b of the air funnel 8.
  • the radius of curvature r is 0.33xD
  • the contraction of flow assumes about 0.99.
  • contraction of flow is not caused by a corner of an intake inlet but when the radius of curvature r is less than 0.33xD, the flow coefficient is degraded and flow separation is generated.
  • the fuel injectors 14 are arranged in a manner to inject a fuel toward a center of the intake passage from the separation layer a.
  • a fuel supply device is assembled in the following manner. That is, the respective fuel injectors 14 are first mounted to the support bracket 15" . Then, the branch pipes 16a of the fuel supply pipe 16 and the electric power supply harnesses 14e are mounted to the respective fuel injectors 14. Subsequently, the support bracket 15" is mounted to the upper case 11b. Then, the upper case 11b with the support bracket 15" mounted thereto is mounted to the lower case 11a.
  • the separate chamber 68 is compartmented by the support bracket 15" in the air cleaner 10 and the injector bodies of the fuel injectors 14 are accommodated inside the separate chamber 68. Therefore, the injector bodies are not exposed to the air flow M in the air cleaner 10. Accordingly, it is possible to suppress the air resistance caused by the fuel injectors 14. Besides, since the fuel injectors 14 are accommodated inside the air cleaner 10, it is possible to improve the air cleaner 10 in waterproof quality. As described above, with the present fuel supply device, it is possible to make reduction in air resistance and an improvement in waterproof quality compatible with each other in spite of the fuel injectors 14 being arranged upstream of the openings of the intake passage 90.
  • the support bracket 15" (the fuel injectors 14) are arranged inside the arcuate-shaped center line M of the main flow of an air. Therefore, from the viewpoint of arrangement, the fuel injectors 14 can be suppressed in making resistance to the air flow. Accordingly, it is possible to avoid that the air resistance of the fuel injectors 14 constitutes a factor to obstruct an increase in engine output.
  • the single support bracket 15" the common separate chamber 68 to accommodate the plurality of fuel injectors 14. Accordingly, as compared with the case where separate chambers 68 are individually formed for the respective fuel injectors 14, it is possible to achieve reduction in the number of parts.
  • the fuel supply device can be relatively easily assembled in spite of the fuel injectors 14 being arranged inside the air cleaner 10.
  • connection between the fuel injectors 14 and the fuel supply pipe 16 and connection between the fuel injectors 14 and the electric power supply harnesses 14e are both effected in the separate chamber 68 within the support bracket 15". Accordingly, it suffices that such connection be performed when the support bracket 15" is mounted to the upper case 11b. With the present fuel supply device, these elements can be connected together before the upper case 11b and the lower case 11a are assembled together.
  • the fuel injectors 14 do not project outside the air-cleaner case 11. Therefore, it is possible to make the fuel supply device look better.
  • Figs. 5 to 7 are views illustrating a fuel supply device according to a second embodiment.
  • a cylinder head 2 is mounted on an upper mating surface 1a of a cylinder body 1 of an engine 21.
  • the cylinder head 2 and the cylinder body 1 are clamped together by means of head bolts (not shown) .
  • a head cover 3 is mounted on an upper mating surface 2a of the cylinder head 2.
  • a recess to form a part of a combustion chamber 2c is formed on a lower mating surface 2b of the cylinder head 2.
  • An intake valve opening 2d and an exhaust valve opening (not shown), which are opened to the combustion chamber 2c, are opened and closed by an intake valve 4a and an exhaust valve 4b, respectively.
  • the intake valve 4a and the exhaust valve 4b, respectively, are drivenly opened and closed by an intake cam shaft 5a and an exhaust cam shaft 5b.
  • a lower case 11a is compartmented into a front portion (a right portion in Fig. 5 ) and a rear portion (a left portion in Fig. 5 ). According to the embodiment, however, an air inlet 11c opened downward is formed in the front portion.
  • the rear portion comprises a downwardly expanded outlet 11d.
  • the outlet 11d mounts to a bottom surface thereof four sets of air funnels 8 of respective cylinders.
  • An element 12 is in the form of a thick plate to cover the air inlet 11c of the lower case 11a and interposed by both flanges 11e, 11f.
  • An upper case 11b is substantially arcuate-shaped as viewed in cross section. A main flow of an air sucked from the air inlet 11c is changed in a flow direction to be led to air funnels 8 such that a center line M of the flow assumes an arcuate shape.
  • a boss 7c is formed on a rear wall of a throttle body 7, that is, a wall positioned on an opposite side of a center line A of an intake passage to a cylinder bore axis B.
  • Respective fuel injectors 13 are fixed in a state of being inserted into the bosses 7c.
  • a tip end of an injection nozzle 13c of the fuel injector 13 is positioned near to an inner surface of the throttle body 7.
  • an injection axis 13a of the fuel injector 13 intersects an intake passage axis A in the vicinity of an inlet of an intake port 2e and is directed toward a roof wall of the intake port 2e.
  • Respective fuel injectors 14 are supported on a rear wall 11g of the upper case 11b of an air cleaner 10 through a common support bracket 15.
  • the support bracket 15 is formed to be substantially L-shaped in cross section to have a vertical wall 15a and a transverse wall 15b.
  • the vertical wall 15a also functions as a guide plate to direct a main flow M of an air flowing in the air cleaner 10, toward the air funnels 8.
  • Both left and right ends of the vertical wall 15a and the transverse wall 15b, respectively, are connected to substantially triangular-shaped end walls 15c (see Fig. 6 ).
  • a substantially trigonal prism shaped separate chamber 68 is defined between the support bracket 15 and the rear wall 11g.
  • Flanges 15f are formed at peripheral edges of the vertical wall 15a, the transverse wall 15b, and the end walls 15c, the flanges 15f being detachably bolted and fixed to the rear wall 11g.
  • a sealing member 15e is present between the flanges 15f and the rear wall 11g.
  • the transverse wall 15b is formed with cylindrical-shaped bosses 15d, which expand downward.
  • the respective fuel injectors 14 are fixed in a state of being inserted into the bosses 15d, and injection nozzles 14c project downward from the bosses 15d.
  • Fuel introduction portions 14b are provided on upper ends of the respective fuel injectors 14, the fuel introduction portions 14b being inserted into and connected to pipes 16a branching off a single common fuel supply pipe 16.
  • both ends of the fuel supply pipe 16 extend through the rear wall 11g of the upper case 11b to project rearward (toward a back side of a plane of Fig. 6 ), and joints 16b, 16c are provided on outer projecting portions of the fuel supply pipe 16 to be connected to fuel pipes on a fuel supply side and on a fuel return side.
  • electric power supply harnesses 14e are connected to the respective fuel injectors 14.
  • the four sets of electric power supply harnesses 14e in a bundled state extend through insertion ports 11j (see Fig. 7 ) of the rear wall 11g to be led outside.
  • a connection connector (not shown).
  • the four fuel injectors 14 along with the fuel supply pipe 16 and the electric power supply harnesses 14e are mounted on the support bracket 15 to be made integral as an injector unit.
  • the injector unit is arranged in the air cleaner 10, especially, within the separate chamber 68 compartmented by the support bracket 15 and the upper case 11b.
  • the joints 16b, 16c of the fuel supply pipe 16 and the connector connected to edges of the harnesses 14e are connected to external circuits outside the air cleaner 10.
  • the respective fuel injectors 14 are arranged outside (an opposite side to a center of the arcuate shape) the arcuate-shaped center line M of the main flow of an air.
  • an injection axis 14a of each fuel injector 14 intersects a center line A of an intake passage 90 and hence the center line M of the main flow.
  • the injection axis 14a is directed toward a rear surface (a surface on the right in Fig. 6 ) of a valve disk 9b (shown by two-dot chain lines in Fig. 5 ) in a fully closed position.
  • the fuel supply device is assembled in the following manner. That is, the respective fuel injectors 14 are first mounted to the support bracket 15. Then, the branch pipes 16a of the fuel supply pipe 16 and the electric power supply harnesses 14e are mounted to the respective fuel injectors 14. Subsequently, the support bracket 15 is mounted to an inner surface of the rear wall 11g of the upper case 11b. Thereby, the fuel injectors 14 are mounted to the upper case 11b from inside. Then, the upper case 11b with the support bracket 15 mounted thereto is mounted to the lower case 11a.
  • the separate chamber 68 is formed inside the air cleaner 10 by the support bracket 15 and the fuel injectors 14 are accommodated inside the separate chamber 68. Accordingly, in the same manner as in the first embodiment, it is possible to achieve reduction in air resistance and an improvement in waterproof quality.
  • the support bracket 15 (the fuel injectors 14) is arranged outside the arcuate-shaped center line M of the main flow of an air. Accordingly, in the same manner as in the first embodiment, from the viewpoint of arrangement, the support bracket 15 (the fuel injectors 14) can be suppressed in making resistance to the air flow.
  • the fuel injectors 14, the fuel supply pipe 16, and the electric power supply harnesses 14e are mounted to the support bracket 15 to be made integral as an injector unit.
  • the injector unit is arranged in the air cleaner 10 (especially, the separate chamber 68) and detachably bolted and fixed to the air-cleaner case 11. Therefore, the mounting operation of the fuel injectors 14, the fuel supply pipe 16, and the like can be made easy in spite of the plurality of fuel injectors 14 being provided.
  • the injector unit is positioned as a whole in the air-cleaner case 11, and in particular, the fuel injectors 14 do not project outside, it is possible to avoid a problem that the fuel injectors 14 interfere with other vehicle-mounted parts to be damaged or the like.
  • the both ends of the fuel supply pipe 16 are caused to project outside the air-cleaner case 11, and the joints 16b, 16c are provided on the projecting portions of the fuel supply pipe.
  • the connector connected to the edges of the harnesses 14e is arranged outside the air-cleaner case 11. Therefore, the operations of connection and disconnection of a fuel circuit and an electric circuit can be easily performed in spite of the injector unit being arranged inside the air cleaner 10.
  • a fuel supply device according to a third embodiment will be described with reference to Figs. 8 to 11 .
  • a separate chamber 68 is compartmented by a support bracket 15 in an intake chamber in an air cleaner 10.
  • Fuel injectors 14 are accommodated inside the separate chamber 68.
  • injection nozzles 14c are accommodated within the separate chamber 68. That is, while opening ends of the nozzles are opened to the intake chamber, the injection nozzles 14c are substantially accommodated within the separate chamber 68.
  • an air-cleaner case 11 comprises a lower case 11a and an upper case 11b, and flanges 11e, 11f of the cases 11a, 11b are detachably joined together by means of bolts 65 and nuts 66.
  • the support bracket 15 and the upper case 11b are fixed together by bolts 67 inserted from outside the upper case 11b.
  • fasteners such as the bolts 67, etc. are exemplary and fixation can be of course achieved by means of fasteners such as screws, etc.
  • Pipes 16a branching off a fuel supply pipe 16 are connected to upper ends of the respective fuel injectors 14. As shown in Figs. 9 and 10 , an insertion port 75 is formed on the rear wall 11g of the upper case 11b. A sealing member 73 for waterproofing is fitted into the insertion port 75, and the fuel supply pipe 16 extends through the sealing member 73. With such arrangement, the fuel supply pipe 16 is arranged inside (strictly, an interior of the separate chamber 68) and outside the air cleaner 10 through the insertion port 75.
  • the respective fuel injectors 14 are connected to electric power supply harnesses 14e within the separate chamber 68.
  • an insertion port 76 is formed on the rear wall 11g of the upper case 11b, and a sealing member 74 for waterproofing is also fitted into the insertion port 76.
  • Four sets of electric power supply harnesses 14e are bundled to make a group of harnesses 70 to extend through the sealing member 74 .
  • the harnesses 70 are arranged inside and outside the air cleaner 10 through the insertion port 76.
  • a connection connector 71 is provided on edges of the harnesses 70 outside the air cleaner 10.
  • the fuel supply device according to the embodiment can be assembled in the same manner as the fuel supply device according to the second embodiment.
  • the invention is useful in fuel supply devices for engines and vehicles provided with the same.

Claims (10)

  1. Kraftstoffzuführungsvorrichtung für eine Brennkraftmaschine (21), aufweisend einen Kraftstoffeinspritzer (14) zum Einspritzen von Kraftstoff in Richtung zu einer Öffnung eines Einlasskanales (90), wobei der Einlasskanal (90) eine Lufteinlasskammer (10) mit der Brennkraftmaschine (21) verbindet, ein Luftfiltergehäuse (11) mit einem ersten Gehäuse (11 b) und einem zweiten Gehäuse (11a), verbunden mit dem ersten Gehäuse (11b), um mit diesem zusammenzuwirken, um die Einlasskammer (10) zu bilden, dadurch gekennzeichnet, dass eine von der Einlasskammer (10) separate Kammer (68) durch ein Abtrennteil (15, 15") abgeteilt ist und zumindest ein Einspritzerkörper des Kraftstoffeinspritzers (14) in der separaten Kammer (68) untergebracht ist, wobei das Abtrennteil (15, 15") an dem ersten Gehäuse (11 b) montiert ist und der Einlasskanal (90) mit dem zweiten Gehäuse (11a) verbunden ist.
  2. Kraftstoffzuführungsvorrichtung nach Anspruch 1, wobei das Abtrennteil (15, 15") ein Lagerungshalter (15, 15") ist, um den Kraftstoffeinspritzer (14) zu lagern, die die separate Kammer (68) in der Einlasskammer (10) bildet.
  3. Kraftstoffzuführungsvorrichtung nach Anspruch 1 oder 2, wobei die Einlasskammer einen Einleitungsabschnitt zum Einleiten von Luft hat, der Einlasskanal die Öffnung hat, geöffnet in die Einlasskammer und die Luft in die Einlasskammer von der Öffnung zu der Brennkraftmaschine führt, das Abtrennteil (15, 15") die separate Kammer innerhalb der Einlasskammer bildet und der Einspritzer (14) einen Einspritzerkörper und eine Düse hat, wobei zumindest der Einspritzerkörper innerhalb der separaten Kammer aufgenommen ist, wobei der Einspritzer (14) wirkt, einen Kraftstoff zwischen dem Einleitungsabschnitt in die Einlasskammer und die Öffnung einzuspritzen.
  4. Kraftstoffzuführungsvorrichtung nach einem der Ansprüche 1 bis 3, außerdem aufweisend ein Kraftstoffzuführungsrohr, verbunden mit dem Einspritzer (14) in der separaten Kammer (68).
  5. Kraftstoffzuführungsvorrichtung nach einem der Ansprüche 1 bis 4, außerdem aufweisend eine elektrische Leistungs- Zuführungsverkabelung, verbunden mit dem Einspritzer (14) in der separaten Kammer (68).
  6. Kraftstoffzuführungsvorrichtung nach einem der Ansprüche 1 bis 5, wobei das Abtrennteil (15, 15") an einer inneren Oberfläche des ersten Gehäuses (11 b) montiert ist.
  7. Kraftstoffzuführungsvorrichtung nach den Ansprüchen 4 und 5, wobei das Kraftstoffzuführungsrohr mit dem Einspritzer (14) in der separaten Kammer verbunden ist, die elektrische Leistungs- Zuführungsverkabelung mit dem Einspritzer (14) in der separaten Kammer verbunden ist, wobei ein Verbinder vorgesehen ist, der mit einer Kante des Kabelbaums verbunden ist, und wobei der Einspritzer (14), das Kraftstoffzuführungsrohr und die elektrische Leistungs- Zuführungsverkabelung integral als eine Einspritzereinheit hergestellt und in der separaten Kammer angeordnet sind, und der Verbinder außerhalb der Einlasskammer angeordnet ist.
  8. Kraftstoffzuführungsvorrichtung nach einem der Ansprüche 1 bis 7, außerdem aufweisend eine Mehrzahl von Einlasskanälen, von denen jeder eine Öffnung hat, geöffnet in die Einlasskammer und um die Luft in die Einlasskammer von der Öffnung in einer Brennkraftmaschine führen, und mit einer Mehrzahl von Einspritzern, wobei jeder von diesen einen Einspritzerkörper und eine Düse hat und wirkt, um einen Kraftstoff zwischen dem Einleitungsabschnitt in die Einlasskammer und die jeweilige Einlassöffnung einzuspritzen, wobei zumindest die Einspritzerkörper der Mehrzahl der Einspritzer innerhalb der separaten Kammer, gebildet innerhalb der Einlasskammer durch das Abtrennteil (15, 15"), untergebracht sind.
  9. Fahrzeug, versehen mit einer Kraftstoffzuführungsvorrichtung nach einem der Ansprüche 1 bis 8.
  10. Verfahren zum Montieren einer Kraftstoffzuführungsvorrichtung, die aufweist einen Einlasskammerkasten, mit einem ersten Gehäuse (11 b) und einem zweiten Gehäuse (11a), verbunden mit dem ersten Gehäuse (11b), um mit diesem zusammenzuwirken, um eine Einlasskammer (10) zu bilden, wobei ein Einlasskanal, verbunden mit dem zweiten Gehäuse (11a) eine Öffnung hat, geöffnet zu der Einlasskammer und der eine Luft in die Einlasskammer von der Öffnung zu der Brennkraftmaschine führt,
    ein Abtrennteil (15, 15"), um eine separate Kammer innerhalb der Einlasskammer zu bilden, und
    einen Einspritzer (14) mit einem Einspritzerkörper und einer Düse, wobei zumindest der Einspritzerkörper innerhalb der separaten Kammer untergebracht ist, der Einspritzer (14) wirkt, um Kraftstoff zwischen einen Lufteinleitungsabschnitt der Einlasskammer und der Öffnung einzuspritzen, wobei das Verfahren die Schritte aufweist von:
    Montieren des Abtrennteils (15, 15") an einer inneren Oberfläche des ersten Gehäuses (11 b) während des Anordnens des Einspritzers (14) zwischen der inneren Oberfläche des ersten Gehäuses (11 b) und des Abtrennteils (15, 15"), oder Anordnen des Einspritzers (14) innerhalb dem Abtrennteil (15, 15"), und
    Zusammenfügen des ersten Gehäuses (11b), an dem das Abtrennteil (15, 15") montiert ist, und des zweiten Gehäuses (11a).
EP04799485A 2003-11-07 2004-11-04 Kraftstoffzufuhrvorrichtung, fahrzeug und kraftstoffzufuhrvorrichtungsmontageverfahren Active EP1681459B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003378583 2003-11-07
PCT/JP2004/016301 WO2005045236A1 (ja) 2003-11-07 2004-11-04 燃料供給装置、車両、及び燃料供給装置の組立方法

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EP1681459A1 EP1681459A1 (de) 2006-07-19
EP1681459A4 EP1681459A4 (de) 2009-09-23
EP1681459B1 true EP1681459B1 (de) 2011-04-06

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EP (1) EP1681459B1 (de)
JP (1) JP4353434B2 (de)
AT (1) ATE504737T1 (de)
DE (1) DE602004032162D1 (de)
TW (1) TWI271473B (de)
WO (1) WO2005045236A1 (de)

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JP4865603B2 (ja) * 2007-03-07 2012-02-01 本田技研工業株式会社 インシュレータ構造
JP6089405B2 (ja) 2012-01-23 2017-03-08 スズキ株式会社 内燃機関の燃料供給装置
JP5883742B2 (ja) * 2012-08-10 2016-03-15 本田技研工業株式会社 鞍乗型車両の吸気構造
JP6166927B2 (ja) * 2012-09-24 2017-07-19 本田技研工業株式会社 直噴インジェクタユニットの組付方法及び組付装置
WO2014185091A1 (ja) 2013-05-17 2014-11-20 川崎重工業株式会社 鞍乗型車両の吸気チャンバ
JP6269081B2 (ja) * 2014-01-15 2018-01-31 スズキ株式会社 インジェクタ取付構造
CN109891080B (zh) * 2016-09-30 2021-06-04 Tvs电机股份有限公司 用于两轮车辆的进气系统
US10724482B2 (en) 2018-02-05 2020-07-28 Honda Motor Co., Ltd. Air cleaner connecting tube structure
EP4127446A1 (de) * 2020-03-26 2023-02-08 TVS Motor Company Limited Antriebseinheit und einlasselement dafür

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JPS5835266A (ja) * 1981-08-26 1983-03-01 Mitsubishi Electric Corp 燃料噴射弁の支持構造
JPS6357370U (de) * 1986-10-01 1988-04-16
JPH01300061A (ja) * 1988-05-27 1989-12-04 Hitachi Ltd 燃料噴射装置
US5261375A (en) * 1989-11-06 1993-11-16 General Motors Corporation Fuel injection assembly for integrated induction system
JPH07247924A (ja) 1994-03-10 1995-09-26 Keihin Seiki Mfg Co Ltd 燃料噴射装置
US5575247A (en) * 1995-02-01 1996-11-19 Nippondenso Co., Ltd. Air intake device for an internal combustion engine
JP3724674B2 (ja) 1997-01-14 2005-12-07 本田技研工業株式会社 燃料噴射装置
JPH10205410A (ja) * 1997-01-20 1998-08-04 Toyota Motor Corp 内燃機関の燃料噴射装置
JP2000097131A (ja) * 1998-09-22 2000-04-04 Yamaha Motor Co Ltd 燃料噴射弁の配置構造

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EP1681459A1 (de) 2006-07-19
WO2005045236A1 (ja) 2005-05-19
JP4353434B2 (ja) 2009-10-28
ATE504737T1 (de) 2011-04-15
TW200530503A (en) 2005-09-16
TWI271473B (en) 2007-01-21
EP1681459A4 (de) 2009-09-23
JPWO2005045236A1 (ja) 2007-05-17
DE602004032162D1 (de) 2011-05-19

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