WO2003078829A1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

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Publication number
WO2003078829A1
WO2003078829A1 PCT/JP2003/003077 JP0303077W WO03078829A1 WO 2003078829 A1 WO2003078829 A1 WO 2003078829A1 JP 0303077 W JP0303077 W JP 0303077W WO 03078829 A1 WO03078829 A1 WO 03078829A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
fixed
fixed core
core
sleeve
Prior art date
Application number
PCT/JP2003/003077
Other languages
English (en)
Japanese (ja)
Inventor
Yoshiaki Takashima
Takahisa Suda
Yoshikazu Suzuki
Original Assignee
Bosch Automotive Systems 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
Priority claimed from JP2002071588A external-priority patent/JP3790711B2/ja
Priority claimed from JP2002071589A external-priority patent/JP2003269288A/ja
Application filed by Bosch Automotive Systems Corporation filed Critical Bosch Automotive Systems Corporation
Priority to EP03710360A priority Critical patent/EP1486665A4/fr
Priority to KR1020037014690A priority patent/KR100597760B1/ko
Publication of WO2003078829A1 publication Critical patent/WO2003078829A1/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M55/007—Venting means
    • 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
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the present invention relates to a fuel injector for injecting fuel directly into a cylinder of an internal combustion engine.
  • a fuel injector for injecting fuel directly into a cylinder of an internal combustion engine as in a common rail system for example, a fuel injector of the type disclosed in Japanese Patent Laid-Open No. 7-310625 is known.
  • the fuel injector connects the control chamber in the injector body to the low pressure part by opening the solenoid valve, thereby removing the back pressure of the valve bison and lifting the nozzle for fuel injection.
  • the solenoid valve is de-energized to release the communication between the control chamber and the low pressure part, thereby applying a predetermined back pressure to the valve biston to push down the nozzle 21.
  • the fuel injection is configured to end.
  • the solenoid valve for fuel injection control which is attached to the main body of the injector and is opened and closed according to the control signal given from the outside, the back flow tube and the exciting coil are wound inside the sleeve for fixing
  • the cylindrical fixed core is coaxially disposed and fixed, and the inner peripheral surface of the fixed core has a bush fitted therein.
  • the parts disposed as described above in the fixing sleeve are manufactured and assembled with a predetermined dimensional accuracy so that no gap is generated between adjacent parts.
  • the amount of bouncing in the suction and release operations of the armature for controlling the communication state between the control chamber and the low pressure section, which is executed in response to turning on and off of the solenoid valve changes.
  • the control of the fuel injection amount can not be stably performed, which causes a problem that the rotational fluctuation of the internal combustion engine is caused.
  • An object of the present invention is to provide a fuel indicator that can solve the above-mentioned problems in the prior art. ⁇
  • Another object of the present invention is to provide a fuel injector capable of stably performing a fuel injection operation immediately after assembly.
  • Another object of the present invention is to provide a fuel injector that does not spend unnecessary operating time.
  • Still another object of the present invention is to provide a fuel injector capable of efficiently performing a fuel injection operation. Disclosure of the invention
  • a feature of the present invention is a solenoid valve for fuel injection control, having a magnet union in which a hollow cylindrical fixed core is fitted in a fixed sleeve and a bush is fitted in the hollow of the fixed core.
  • the magnet union is disposed between the low pressure section and a control chamber for storing high pressure fuel for controlling the lift operation of the nozzle needle, which is provided in the inverter main body, and the solenoid valve is opened.
  • a fuel injector configured such that high pressure fuel in the control chamber escapes to the low pressure portion via the bush when it is turned on, each component in which high pressure fuel in the control chamber is accommodated in the fixed sleep Oil-tight seals are provided between each part to prevent it from entering the gap between the parts.
  • the injector body is provided with a solenoid valve for fuel injection control having a magnet tunnel which incorporates a plurality of parts in a fixed sleeve.
  • the filling air filled in the gaps between the parts in the fixed sleeve by the pressurized fuel sent to the magnet is released out of the fixed sleeve and replaced with fuel. It is in the point which provided the relief passage of. If the fuel injector is operated with filled air in the gap in the fixed slip, pressurized fuel enters the gap, and the pressure of this pressurized fuel quickly expels the filled air from the release passage, The gap is filled with fuel instead of filled air. Therefore, the control of the fuel injection amount can be stably maintained in a short time even immediately after assembling the injector.
  • a solenoid valve for fuel injection control having a magnet tunnel which incorporates a plurality of parts in a fixed sleeve.
  • FIG. 1 is a sectional view showing an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of the magnet valve of the solenoid valve shown in FIG.
  • FIG. 3 is an enlarged cross-sectional view of the main part of the magneto-punch shown in FIG.
  • FIG. 4 is a sectional view of an essential part showing another embodiment of the present invention.
  • FIG. 5 is a front view showing the right half of the exciting coil in another embodiment of the present invention.
  • FIG. 6 is a view for explaining an oil-tight seal when the exciting coil shown in FIG. 5 is provided on a fixed core.
  • FIG. 7 is a front elevational view, in section, of the right half of the exciting coil in still another embodiment of the present invention.
  • FIG. 8 is a view for explaining an oil-tight seal in the case where the exciting coil shown in FIG. 7 is provided on a fixed core.
  • FIG. 9 is a cross-sectional view of an essential part for explaining still another embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of essential parts of another embodiment of the present invention.
  • FIG. 11 is a perspective view of the sleeve shown in FIG.
  • FIG. 12 is a perspective view of the fixed core shown in FIG.
  • FIG. 13 is a perspective view of the back flow tube shown in FIG. 03 03077 Best Mode for Carrying Out the Invention
  • FIG. 1 is a sectional view showing an example of the embodiment of the present invention.
  • Reference numeral 1 denotes a fuel injector used in a common rail system for injecting and supplying fuel to a diesel internal combustion engine.
  • the fuel injector 1 is assembled to a cylinder of a diesel engine, not shown, and injects and supplies high-pressure fuel supplied from a common rail, not shown, into the cylinder by a required amount at a required timing.
  • a solenoid valve 4 is provided in the injector main body 2.
  • the injector body 2 comprises a hollow body 23 having an axial recess 2 2 in which the valve piston 21 slides.
  • the hollow body 23 is connected to a nozzle body 26 terminated by an injection orifice 25 closed by the tip of a nozzle 21 connected to a valve piston 21.
  • the hollow body 23 forms a hollow appendage 28 surrounding an inlet 27 connected to a high pressure fuel supply pump not shown.
  • the fuel is led to the fuel reservoir 29 via the internal conduction path, and the nozzle body 26 is formed with a shoulder 30 on which the pressurized fuel in the fuel reservoir 29 acts.
  • valve piston 2 1 is pushed downward, and the nozzle spring 3
  • the hollow body 23 is formed with a head 33 which is coaxial with the axial recess 22 and in which a drain chamber 32 extending in the axial direction of the hollow body 23 is formed downward.
  • a control chamber 37 in communication with the radial supply conduit 34 and the axial drain conduit 35 is formed at the head 33.
  • the supply conduit 34 is connected to the inlet 2 7 via the radial conduit 3 6 in the hollow body 2 3, and the bottom of the control chamber 3 7 is provided with a valve screw 2.
  • the fuel reservoir 29 is supplied with high pressure fuel by the conduction path 38.
  • high pressure fuel is also supplied to the control chamber 37, when the drain conduction path 35 is communicated with the low pressure fuel portion by the solenoid valve 4 as described later, the fuel in the control chamber 37 is The pressure is configured to be lower than the fuel pressure of the fuel reservoir 29. Since the area of the upper surface of the valve piston 2 1 is larger than the upper surface of the shoulder 30, the solenoid valve 4 closes the drain conduction path 35 so that the control chamber 3 7 is a high pressure fuel. If it is filled, the nozzle needle 24 is held in the position closing the injection orifice 25 and fuel injection is not performed.
  • the fuel pressure in the control chamber 37 passes through the drain conduction path 35 and escapes to the low pressure part of the fuel, and the fuel pressure in the control chamber 37 is greater than the fuel pressure in the fuel reservoir 29. Since the nozzle needle 24 is retracted and the injection orifice 25 is held at the open position, fuel injection is performed.
  • a solenoid valve 4 for controlling the fuel pressure in the control chamber 37 to control the start and end of fuel injection is integrally provided in the injector body 2.
  • the solenoid valve 4 includes a magnet junction 6, and FIG. 2 shows an enlarged sectional view of the magnet junction 6.
  • the magnet unit 6 comprises a back sleeve 1 tube 6 2 and a stationary core 6 3 in a stationary sleeve 61, and the stationary core 6 3 is provided with an excitation coil 64.
  • An O-ring 65 is provided between the fixed sleeve 61 and the back flow tube 62, so that fuel does not leak from the fixed sleeve 62 to the outside of the tube 62. It is configured.
  • a drain mounting portion 6 2 A to be connected to the fuel tank is formed on the body.
  • a bush 67 having a small hole 67A at one end is provided in the axial hole 66 of the fixed core 63.
  • the bush 67 is mounted through the fixed core 63 so that the small hole 67 A and the drain mounting portion 6 2 A are coaxial.
  • the backflow tube 62, the fixed core 63 and the bush 67 are coaxially arranged.
  • the parts disposed as described above in the fixed sleeve 61 are manufactured and assembled with a predetermined dimensional accuracy so that no gap is generated between adjacent parts.
  • armature 4 1 Opposite to the fixed core 6 3 in the magnet 6 is made of magnetic iron A discoid armature 4 1 is provided, and a ball 4 2 (see FIG. 1) acting as a valve is held at the end of a columnar portion 4 1 A extending integrally with the armature 4 1. It is done.
  • the armature 41 is pushed downward by the force of a valve spring (not shown), and the ball 42 is pressed against the open end of the drain conduction path 35 to close the drain conduction path 35.
  • the armature 4 1 overcomes the force of the valve spring and is attracted to the magnet 6, and the ball 4 2 is separated from the open end of the drain conduction path 35 to control Since the high pressure fuel in the chamber 37 escapes to the low pressure portion through the bush 67 and the drain mounting portion 6 2 A and the pressure in the control chamber 37 drops, fuel injection is performed.
  • the nozzle needle 24 is again returned to the position for closing the injection orifice 25 and the fuel injection ends.
  • the backflow tube 62 has a gap G1 due to the surface roughness and assembling of both parts on the surface in contact with the fixed core 63, and the fixed sleep 61 and Also between the fixed core 63 and between the fixed core 63 and the push 67, slight gaps G 2 and G 3 are formed due to dimensional errors caused in the manufacturing process.
  • gaps G1 to G3 are filled with air in the initial stage immediately after the solenoid valve 4 is assembled. For this reason, if the fuel injector 1 is operated in this state, the difference in the damping force between the air and the fuel in these gaps G 1 to G 3 causes the gap to be completely filled with fuel. In this case, the amount of bouncing in the suction and release operations of the armature for controlling the communication state between the control chamber 33 and the low pressure part, which is executed in response to turning on and off the energization of the solenoid valve 4, changes. As a result, immediately after the fuel injector 1 is assembled, the fuel injection amount can not be stably controlled. In order to avoid this failure, the fixed sleeve 61 and the bush 67 are fixed. Seal members S 1 and S 2 are provided for oil-tight sealing so that fuel does not enter the constant flow sleeve 61.
  • FIG. 3 is an enlarged cross-sectional view showing the main part of FIG. 2 in detail.
  • the oil tight seal provided on the fixing sleeve 61 and the bush 67 will be described with reference to FIG.
  • An annular groove 61 B along the circumferential direction is formed on the inner peripheral surface 6 1 A of the fixed sleeve 61, and between the fixed sleeve 61 and the fixed core 63 in the groove 61 B.
  • a sealing member S1 is provided to seal the oil.
  • an annular groove 67C along the circumferential direction is formed on the outer peripheral surface 67B of the bush 67, and between the bush 67 and the fixed core 63 in the groove 67C.
  • a separate seal member S2 is provided for oil tight sealing.
  • Each of the seal members S1 and S2 is formed as an annular member made of a resin material having elasticity.
  • FIG. 4 is a cross-sectional view showing the main part of another embodiment of the present invention.
  • the contact portion C 1 of each of the fixed sleeve 6 1 and the fixed core 6 3 forms a contact portion 6 1 C and a contact portion 6 3 A in a tapered shape, and caulking the upper portion of the fixed sleeve 6 1
  • the fixed core 63 is pressed downward to form an oil tight seal that prevents fuel from entering the gap G 2 from the first armature 41 side at the linear portion in contact with the contact portion C 1.
  • the seal member S1 is omitted.
  • the solenoid valve 4 also has a slight gap G 4 between the stationary core 63 and the exciting coil 64,
  • the same problem as the failure caused by the above-described air filling in the gaps G1 to G3 is caused by the air filling in the gap G4.
  • the fixed core 63 and the excitation coil are avoided.
  • An oil tight seal may be provided between it and 64.
  • FIG. 5 and 6 show another embodiment of the present invention in which an oil tight seal is provided between the fixed core 63 and the exciting coil 64.
  • FIG. 5 is a front view showing the right half of the exciting coil 64 in cross section
  • FIG. 6 illustrates the oil tight seal state when the exciting coil 64 shown in FIG. It is a figure for.
  • the exciting coil 64 is covered with a coating layer 641 formed by molding with a coating material made of an elastic resin material.
  • the outer circumferential surface 6 41 a and the inner circumferential surface 6 4 1 b of the coating layer 61 4 are in the form of annular ridge members extending along the corresponding circumferential surface with a triangular cross section respectively.
  • -Seal members S 31 'and S 32 are formed on the body, whereby the seal members S 31 and S 32 have appropriate elasticity as sealing members. .
  • the exciting coil 64 is provided with the seal members S 31 and S 32 having appropriate elasticity as sealing members, so as shown in FIG.
  • the seal members S 31 and S 32 are elastically pressure-welded to the corresponding wall surfaces of the fixed core 63, and between the fixed core 63 and the exciting coil 64.
  • An oil tight seal is provided.
  • the fuel which is going to enter the gap G4 from the armature 41 side can be stopped by the seal members S31 and S32, and the fuel can be prevented from entering the gap G4.
  • seal members S 31 and S 32 are provided as close to armature 4 1 as possible, It is possible to prevent fuel from entering the gap G4.
  • FIG. 7 A modification of the exciting coil 64 shown in FIG. 5 is shown in FIG. In the embodiment shown in FIG. 7, in place of the seal members S31 and S32, seal members S41 and S42 in the form of projecting ridge members each having a semicircular cross section are integrally formed. This is different from the exciting coil 64 shown in FIG.
  • the exciting coil 64 is provided with the seal members S 41 and S 42 having appropriate elasticity as sealing members, so as shown in FIG.
  • the seal members S 4 1 and S 4 2 are resiliently pressed to the corresponding wall surface of the fixed core 6 3 with elasticity, and the fixed core 6 3 and the exciting coil 6 4
  • An oil tight seal is provided between the As a result, it is possible to stop the fuel which is going to enter the gap G4 from the side of the first motor 4 by the seal members S31 and S32, and to prevent the fuel from entering the gap G4. it can.
  • FIG. 9 shows still another embodiment of the present invention.
  • the fixed core 63 is covered with a coating layer 63 1 formed by molding with a coating material made of an elastic resin material.
  • seal members S 51 and S 52 are formed on the body, whereby the seal members S 51 and S 52 have appropriate elasticity as sealing members.
  • the fixed core 63 is provided with the seal members S 51 and S 52 having appropriate elasticity as sealing members, so the fixed core 63 is fixed sleeve 6 1
  • the seal members S 51 and S 52 are elastically pressed against the corresponding wall of the fixed core 63, and an oil tight seal is provided between the fixed core 63 and the fixed sleeve 61.
  • the fuel which is going to enter the gap G1 to G3 from the armature 41 side can be stopped by the seal members S51 and S52, and the fuel enters the gap G1 to G3. It can be avoided.
  • the fuel injector 1 is provided with an oil-tight seal between the parts in order to prevent the high pressure fuel in the control chamber from entering the gap between the parts contained in the fixed sleeve. , Etc. by attaching the fuel injector 1 to the cylinder Even if the fuel injection operation is performed, after the start of driving, sufficient valve closing force can not be obtained because air is filled in the gap of the gap. There is no change in the amount of bouncing in the suction and release operations of the armature for controlling the communication between the control chamber and the low pressure part, which is executed accordingly. As a result, control of the fuel injection amount can be stably performed immediately after assembling the injector, and rotational fluctuation of the internal combustion engine can be reduced. In addition, since it is not necessary to carry out test operation until exhaust air is eliminated, it is very efficient without spending unnecessary operation time and fuel.
  • FIG. 10 shows the main part of another embodiment of the fuel injector according to the present invention.
  • the solenoid valve 104 shown in FIG. 10 is attached to the injector main body 2 shown in FIG. 1 to constitute a fuel injector.
  • the solenoid valve 104 includes a magnet switch 106.
  • the magnet tunnel 106 comprises a backflow tube 16 2 and a fixed core 1 6 3 in a fixed sleeve 1 6 1 and an excitation coil 1 6 4 is provided on the fixed core 1 6 3 It is done.
  • a 0 ring 16 5 is provided between the fixed sleeve 1 6 1 and the back flow tube 1 6 2, and fuel leaks from the outside between the fixed sleeve 1 6 1 and the back flow tube 1 6 2. It is configured not to.
  • a drain attachment portion 1 6 2 A connected to the fuel tank is formed in the body of the nozzle flow tube 1 6 2.
  • a bushing 167 having a small hole 167A formed at one end is provided in an axial hole 166 of the fixed core 1 6 3.
  • the push 16 7 is mounted through the fixed core 1 6 3 so that the small hole 1 6 7 A and the drain mount 1 6 2 A are coaxial.
  • the backflow tube 16 2, the stationary core 1 6 3 and the bush 1 6 7 are coaxially disposed in the stationary sleeve 1 6 1.
  • the parts disposed as described above in the fixed sleeve 61 are manufactured and assembled with a predetermined dimensional accuracy so that no gap is generated between adjacent parts.
  • a disc-like armature 14 1 made of magnetic iron is provided opposite to the fixed core 1 6 3 in the magnet unit 1 06 and extended integrally with the armature 1 4 1.
  • a ball (not shown) that acts as a valve body is attached to the end of the pillar 1 1 1 A It is held.
  • the mechanism for controlling the fuel injection from the injector body by the movement of the armature 14 1 is the same as that of the above-described embodiment described based on FIG.
  • the back flow tube 16 2 has a gap G 5 due to the surface roughness of the quantitative part and the assembly on the surface in contact with the fixed core 136, and A slight gap G 6 is also formed between the stationary sleeve 16 1 and the stationary core 1 6 3 due to dimensional error occurring in the manufacturing process. In addition, a slight gap G7 is also formed between the bush 1 67 and the fixed core 1 6 3 due to a dimensional error that occurs in the manufacturing process.
  • the bush 16 7 is provided with a relief passage for releasing the filling air.
  • a perspective view of the bush 167 is shown in FIG. As can be seen from FIG. 1 1, the bushing 1 6 7 has four round holes in the same height position as the gap G 5 between the backflow tube 1 6 2 and the stationary core 1 6 3. 1 6 7 B is provided.
  • escape passages 1 6 7 B are provided here, the number of places is not limited to this and may be one or more and may be any place, and even in the shape, it is not a round shape but a square An arbitrary shape or the like may be provided at an appropriate position with an appropriate size.
  • FIG. 12 shows a perspective view of the fixed core 1 63
  • FIG. 13 shows a perspective view of the back flow tube 1 62.
  • auxiliary passages 1 6 3 B are formed on the outer peripheral surface 1 6 3 A opposite to the fixed sleeve 1 6 1, and each auxiliary passage 1 6 3 B is provided from the upper surface 1 6 3 C to the lower surface 1 6 3 D of the fixed core 1 6 3.
  • auxiliary passages 1 6 3 B are provided, but the auxiliary passages 1 6 3 B may be any number of places, and the auxiliary passages 1 6 1 B are formed in a U-shaped cross section However, any other appropriate shape may be used.
  • an auxiliary passage 1 6 2 C is formed in the back flow tube 16 2 so that the auxiliary passage 1 6 2 C is cut out on the lower surface 1 6 2 B opposite to the fixed core T 1 6 3.
  • auxiliary passage 1 6 2 C and the auxiliary passage 1 6 3 B are formed in a position where they communicate with each other, the filling in the lower surface 1 6 3 D side of the fixed core 1 6 3 and the gap G 6 The air is moved to the upper surface 1 6 3 C of the fixed core 1 6 3 in a short time, and the air which has been moved to the upper surface 1 6 3 C is moved to the gap G 5 through the auxiliary passage 1 6 2 C Because it is possible to escape from the gap G5, the charged air can be quickly expelled through the passage 1 4 5 B.
  • auxiliary passages 1 6 2 C are provided, but the present invention is not limited to this. An appropriate number of places can be provided at one or more places, and the shape etc. You may Furthermore, the auxiliary passage 1 6 2 C may be processed to the contact surface of the fixed core 1 6 3 with the back flow tube 1 6 2.
  • the fuel injector 1 0 1 fixes the air filled in the gaps between the components in the fixed sleeve 1 6 1 to the fixed sleeve 1 6 1 by pressurized fuel sent to the magnet unit 1 0 6 Since the release passage 1 6 7 B is provided in the bush 1 6 7 for escaping to the outside of the engine and replacing it with fuel, even if the fuel injection valve is assembled to the cylinder, etc., the fuel injection operation is performed. After driving is started, the air can be replaced with fuel quickly.
  • the fuel injector according to the present invention helps to ensure the stability of operation immediately after the assembly.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de combustible (1). Une valve solénoïde (4) destinée à la commande de l'injecteur de combustible et comprenant une unité aimant (6) ayant un noyau fixe (6) cyclindrique creux logé dans un manchon fixe (61) une garniture d'étanchéité (67) logée dans la partie creuse du noyau fixe (63) est installée dans un corps injecteur (2). Des joints étanches à l'huile (S1, S2) sont logés entre les éléments stockés dans le manchon fixe (61) pour empêcher le combustible haute pression de la chambre de commande (37) d'entrer dans les espacements entre les éléments. La quantité d'injection de combustible peut être commandée de façon stable immédiatement en aval de l'injecteur (1) et consécutivement car une quantité de rebondissement dans les opérations d'attraction et de répulsion de l'armature (41) ne varie pas car, après le début de conduite, une force suffisante fermant la valve ne peut être fournie en raison de l'air remplissant les espacements.
PCT/JP2003/003077 2002-03-15 2003-03-14 Injecteur de combustible WO2003078829A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03710360A EP1486665A4 (fr) 2002-03-15 2003-03-14 Injecteur de combustible
KR1020037014690A KR100597760B1 (ko) 2002-03-15 2003-03-14 연료 분사기

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002071588A JP3790711B2 (ja) 2002-03-15 2002-03-15 燃料インジェクタ
JP2002071589A JP2003269288A (ja) 2002-03-15 2002-03-15 燃料インジェクタ
JP2002/71589 2002-03-15
JP2002/71588 2002-03-15

Publications (1)

Publication Number Publication Date
WO2003078829A1 true WO2003078829A1 (fr) 2003-09-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/003077 WO2003078829A1 (fr) 2002-03-15 2003-03-14 Injecteur de combustible

Country Status (4)

Country Link
EP (1) EP1486665A4 (fr)
KR (1) KR100597760B1 (fr)
CN (1) CN1323238C (fr)
WO (1) WO2003078829A1 (fr)

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AT500774B8 (de) * 2004-08-06 2007-02-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
DE102007044361A1 (de) * 2007-09-17 2009-03-19 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
US7866575B2 (en) * 2009-01-12 2011-01-11 GM Global Technology Operations LLC Pressure actuated fuel injector
US8443780B2 (en) * 2010-06-01 2013-05-21 Caterpillar Inc. Low leakage cam assisted common rail fuel system, fuel injector, and operating method therefor
DE102011078953A1 (de) * 2011-04-07 2012-10-11 Robert Bosch Gmbh Kraftstoffinjektor
US9874168B2 (en) * 2015-07-20 2018-01-23 Ford Global Technologies, Llc Methods and systems for a dual injection fuel system
DE102015220677A1 (de) * 2015-10-22 2017-04-27 Robert Bosch Gmbh Elektromagnetisch betätigbares Einlassventil und Hochdruckpumpe mit Einlassventil
DE102016215745A1 (de) 2016-08-23 2018-03-01 Robert Bosch Gmbh Elektromagnetisch betätigbares Saugventil sowie Verfahren zur Herstellung eines elektromagnetisch betätigbaren Saugventils
FR3065037A1 (fr) * 2017-04-10 2018-10-12 Delphi International Operations Luxembourg S.A R.L. Bague de centrage
CN107120220B (zh) * 2017-06-30 2023-08-29 南岳电控（衡阳）工业技术股份有限公司 一种防止柴油机启动困难的喷油泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785671U (fr) * 1980-11-15 1982-05-27
JPH0514755U (ja) * 1991-08-06 1993-02-26 株式会社日立製作所 電磁弁
JPH07260032A (ja) * 1994-03-25 1995-10-13 Honda Lock Mfg Co Ltd 電磁弁
EP1150001A2 (fr) * 2000-04-27 2001-10-31 Denso Corporation Soupape électromagnétique et injecteur de combustible l'utilisant

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
JPS5965977U (ja) * 1982-10-26 1984-05-02 日産車体株式会社 フユ−エルインジエクタ
IT1296144B1 (it) * 1997-11-18 1999-06-09 Elasis Sistema Ricerca Fiat Valvola di dosaggio registrabile per un iniettore di combustibile per motori a combustione interna.
DE19832826C2 (de) * 1998-07-21 2000-08-17 Bosch Gmbh Robert Montageverfahren für Kraftstoff-Einspritzventil und Vorsteuerventil sowie Kraftstoff-Einspritzventil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785671U (fr) * 1980-11-15 1982-05-27
JPH0514755U (ja) * 1991-08-06 1993-02-26 株式会社日立製作所 電磁弁
JPH07260032A (ja) * 1994-03-25 1995-10-13 Honda Lock Mfg Co Ltd 電磁弁
EP1150001A2 (fr) * 2000-04-27 2001-10-31 Denso Corporation Soupape électromagnétique et injecteur de combustible l'utilisant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1486665A4 *

Also Published As

Publication number Publication date
CN1323238C (zh) 2007-06-27
KR100597760B1 (ko) 2006-07-05
EP1486665A4 (fr) 2010-09-01
EP1486665A1 (fr) 2004-12-15
KR20040012819A (ko) 2004-02-11
CN1507537A (zh) 2004-06-23

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