WO2011024500A1 - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
WO2011024500A1
WO2011024500A1 PCT/JP2010/054854 JP2010054854W WO2011024500A1 WO 2011024500 A1 WO2011024500 A1 WO 2011024500A1 JP 2010054854 W JP2010054854 W JP 2010054854W WO 2011024500 A1 WO2011024500 A1 WO 2011024500A1
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WO
WIPO (PCT)
Prior art keywords
fuel
horn
hole
main body
needle
Prior art date
Application number
PCT/JP2010/054854
Other languages
French (fr)
Japanese (ja)
Inventor
英治 岸
満季 浅井
Original Assignee
株式会社豊田自動織機
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 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2011024500A1 publication Critical patent/WO2011024500A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations

Definitions

  • the present invention relates to a fuel injection device, and more particularly to a fuel injection device that vibrates and atomizes fuel by a bolt-clamped Langevin vibrator.
  • the piezo actuator is generally long and large in volume, the resonance point is low. Therefore, there has been a problem that the number of oscillations can not be obtained sufficiently in the very short time (1 to 1.5 milliseconds) of injection employed in recent common rails.
  • the element since the element may be broken due to resonance, the power can not be increased, and as a result, there is a problem that the atomization effect is reduced. Although such a problem does not occur unless the resonance of the piezoelectric actuator is used, in this case, since the amplitude can not be large, the atomization effect is almost lost.
  • the present invention has been made to solve such problems, and it is an object of the present invention to provide a fuel injection device in which the atomization effect of the injected fuel is improved.
  • the fuel injection device is provided in the main body portion provided with the injection hole through which the fuel is injected and the fuel passage communicating with the injection hole, and is provided inside the main body portion to connect or block the injection hole and the fuel passage.
  • a horn provided in the fuel passage, and a vibrator for vibrating the horn, wherein the horn is formed with a flange portion fixed to the main body portion, and the flange portion is for vibration of the horn. It is provided at a position corresponding to a clause.
  • the flange portion provided at the position corresponding to the vibration node of the horn is fixed to the main body, so that when the valve member communicates the injection hole with the fuel passage, the horn resonates. Then, the tip of the horn vibrates to a large extent, causing cavitation and flow rate fluctuation in the fuel, so that the atomization of the fuel injected from the injection hole can be improved.
  • FIG. 2 is an enlarged cross-sectional view of a tip portion of the fuel injection device according to Embodiment 1.
  • 7 is a cross-sectional view of a fuel injection device according to Embodiment 2.
  • FIG. 10 is an enlarged cross-sectional view of a tip portion of a fuel injection device according to Embodiment 2.
  • FIG. 10 is a cross-sectional view of a fuel injection device according to Embodiment 3.
  • FIG. 10 is an enlarged cross-sectional view of a tip portion of a fuel injection device according to Embodiment 3.
  • Embodiment 1 The configuration of the fuel injection device according to the first embodiment of the present invention is shown in FIG.
  • the fuel injection device 1 includes a main body 4 including a lower casing 2 and an upper casing 3.
  • the lower casing 2 has a cylindrical fixed portion 2a in which an upper portion is opened and a circular hole 2a1 having a diameter smaller than the diameter of the upper portion is formed at the lower portion, and an outer diameter smaller than the outer diameter of the fixed portion 2a. It comprises from the cylindrical nozzle part 2b which it has.
  • An annular edge portion 2b1 is provided at the upper end of the nozzle portion 2b, and the nozzle portion 2b is inserted into the hole 2a1 from the inside of the fixed portion 2a and the edge portion 2b1 abuts on the inner bottom surface 2a2 of the fixed portion 2a
  • the lower casing 2 is configured.
  • An internal thread portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixed portion 2 a of the lower casing 2.
  • the upper casing 3 has a cylindrical shape in which the upper portion is closed and the lower portion is opened, and an external thread portion (not shown) is formed on the outer peripheral surface of the lower portion.
  • the lower casing 2 and the upper casing 3 are fixed to constitute the main body 4.
  • a communication hole 5 is provided on the side surface of the upper casing 3, and the common rail 7 and the pump 8 are connected to the communication hole 5 via the pipe 6, and the fuel in the common rail 7 is connected via the communication hole 5.
  • the internal space 3a of the upper casing 3 is supplied.
  • the lower end portion of the nozzle portion 2b has a tapered shape and is closed by a circular lower end surface 2b2.
  • An injection hole 9 penetrating the inclined side surface portion 2b4 is provided in the inclined inclined side surface portion 2b4 connecting the lower end portion of the cylindrical cylindrical side surface portion 2b3 and the lower end surface 2b2.
  • a storage chamber 10 in which the fuel is stored is provided at the lower end inside the nozzle portion 2 b so as to communicate with the injection hole 9.
  • the bolted Langevin 11 has a cylindrical horn 12 provided so as to extend from the inner space 3 a of the upper casing 3 toward the lower end of the inner portion of the lower casing 2, and a disk shaped flange portion 13 provided on the horn 12. And a plurality of annular piezoelectric elements 14 which are vibrators for vibrating the horn 12.
  • the piezoelectric element 14 is formed of lead zirconate titanate (PZT), and the horn 12 is formed of steel.
  • the horn 12 may be formed of aluminum.
  • the flange portion 13 is fixed to the main body portion 4 by being pinched between the edge portion 2 b 1 of the nozzle portion 2 b and the lower end portion of the upper casing 3.
  • the piezoelectric element 14 is bolted to the flange portion 13 so that the horn 12 is inserted into the hole of the piezoelectric element 14.
  • the horn 12 is vibrated by the piezoelectric element 14, and the flange portion 13 is provided at a position corresponding to a node of the vibration, and the length of the horn 12 is set so that the tip of the horn 12 becomes an antinode of the vibration. .
  • the position corresponding to the node of vibration and the length of the horn 12 can be determined by eigen value analysis which is a technique well known to those skilled in the art.
  • a cylindrical cylinder member 15 is attached to the horn 12 so that the upper end portion of the horn 12 is inserted therein.
  • a piston member 16 slidable in the vertical direction is provided inside the cylinder member 15, and a piezo actuator 17 that slides the piston member 16 downward is provided so as to be in contact with the piston member 16.
  • a pressure chamber 18 separated from the internal space 3 a of the upper casing 3 is formed in the cylinder member 15 by the horn 12, the cylinder member 15 and the piston member 16.
  • the cylinder member 15 is provided with a small hole 19 communicating the internal space 3 a with the pressure chamber 18. The small hole 19 is closed by the piston member 16 as the piston member 16 slides downward in the cylinder member 15, and the communication between the internal space 3a and the pressure chamber is interrupted. .
  • the horn 12 is provided with a needle 20 which is a valve member so as to be included in a through hole 12 a provided to penetrate in the axial direction.
  • the needle 20 is composed of a sliding fixing portion 20a in the upper portion and a valve body portion 20b in the lower portion.
  • the slide fixing portion 20a has a cylindrical shape having an outer diameter the same size as the inner diameter of the through hole 12a, and slidably fixes the needle 20 in the through hole 12a, and the pressure chamber 18;
  • the through hole 12a is separated from the region below the sliding fixing portion 20a.
  • the valve body portion 20b has a cylindrical shape having an outer diameter smaller than the outer diameter of the slide fixing portion 20a.
  • the pressure chamber 18 is provided with a spring 24 having one end connected to the piston member 16 and the other end connected to the slide fixing portion 20a.
  • a gap 23 is formed between the valve body portion 20b and the inner peripheral surface of the through hole 12a.
  • the gap 23 is in communication with the internal space 3 a of the upper casing 3 via the passage 22.
  • the communication hole 5, the internal space 3a, the path 22, and the gap 23 constitute a fuel passage through which the fuel flows.
  • the needle 20 slides up and down in the through hole 12 a by the pressure in the pressure chamber 18. By forming the gap 23 between the valve body 20 b and the inner circumferential surface of the through hole 12 a, the needle 20 can slide without interfering with the horn 12.
  • the lower end portion of the valve body portion 20b of the needle 20 has a circular lower end surface 20b1 and the same inclination angle as the inner peripheral surface 2b5 of the inclined side portion 2b4 of the nozzle portion 2b
  • An inclined surface 20b2 is provided along the periphery of 20b1.
  • the diameter of the lower end surface 20b1 is the same as the diameter of the upper opening in the storage chamber 10.
  • the fuel pumped by the pump 8 is stored in the common rail 7, and the fuel is supplied to the internal space 3 a of the upper casing 3 through the pipe 6 and the communication hole 5.
  • the fuel supplied to the internal space 3a flows into the pressure chamber 18 through the small holes 19, and flows into the gaps 23 and 21 through the passage 22, whereby the inside of the main body 4 is filled with the fuel. Ru.
  • the energization of the piezo actuator 17 is stopped, and the depression of the piston member 16 by the piezo actuator 17 is stopped. Then, the pressure in the pressure chamber 18 pushes the piston member 16 upward, which causes the pressure in the pressure chamber 18 to decrease. Then, the pressure difference between the pressure in the gaps 21 and 23 and the pressure in the pressure chamber 18 becomes larger than the elastic force of the spring 24. As a result, the needle 20 moves upward, and the storage chamber 10 and the storage chamber 10 Since the upper space is in communication, fuel flows into the storage chamber 10 and fuel is injected from the injection holes 9.
  • the horn 12 resonates by supplying the oscillating current of the resonance frequency to the piezoelectric element 14.
  • the vibration of the horn 12 causes the fuel in the gaps 21 and 23 to vibrate.
  • the horn 12 is provided with the flange portion 13 at a position corresponding to a node of vibration, and the horn 12 is set to a length at which the tip thereof becomes the antinode of vibration.
  • Cavitation and flow rate fluctuation occur in the fuel in the chamber 10, and when injected from the injection hole 9, the fuel is atomized. Since the particle size of the atomized fuel decreases in inverse proportion to the frequency of the horn 12, the atomization effect of the fuel is improved by making the tip of the horn 12 be the antinode of vibration. Further, since the amplitude is increased due to the resonance of the horn 12, the periodic fluctuation effect of the fuel injection can be expected, the mixing of the fuel and the air can be promoted by the entraining effect, and the improvement of the combustibility can be expected. Furthermore, since fuel is injected from the injection hole 9 while receiving such an action, the clogging prevention effect of the injection hole 9 can also be expected.
  • the current may be intermittently supplied to the piezoelectric element 14 so that the current flows to the piezoelectric element 14 only at the timing when the fuel is injected from the injection hole 9.
  • resonance may not occur and conducting control becomes somewhat difficult.
  • the needle 20 communicates the injection hole 9 with the fuel passage.
  • the tip of the horn 12 corresponding to the antinode of vibration vibrates largely, causing cavitation and flow rate fluctuation in the fuel, so that the atomization of the fuel injected from the injection hole 9 can be improved. it can.
  • Embodiment 2 of the present invention a fuel injection device according to Embodiment 2 of the present invention will be described.
  • the same reference numerals as the reference numerals in FIGS. 1 and 2 denote the same or similar constituent elements, and thus the detailed description thereof will be omitted.
  • the fuel injection device according to Embodiment 2 of the present invention is different from Embodiment 1 in that the moving mechanism of the needle is changed.
  • the fuel injection device according to the second embodiment is used for a gasoline engine or a low pressure injector (for example, 10 MPa or less) for adding an exhaust fuel.
  • the fuel injection device 30 includes a main body 34 including a lower casing 32 and an upper casing 33.
  • the lower casing 32 has a cylindrical fixing portion 32a having an opening at the top and a circular hole 32a1 having a diameter smaller than the diameter of the opening at the bottom, and an outer diameter smaller than the outer diameter of the fixing portion 32a. It comprises from the cylindrical nozzle part 32b which it has.
  • An annular edge portion 32b1 is provided at the upper end of the nozzle portion 32b, and the nozzle portion 32b is inserted into the hole 32a1 from the inside of the fixing portion 32a, and the edge portion 32b1 abuts on the inner bottom surface 32a2 of the fixing portion 32a.
  • the lower casing 32 is configured.
  • a female screw portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixed portion 32 a of the lower casing 32.
  • the upper casing 33 has a cylindrical small diameter portion 33b whose upper end 33b1 is closed, and a cylindrical large diameter portion 33a which is open at the bottom and has an outer diameter larger than the outer diameter of the small diameter portion 33b.
  • a male screw portion (not shown) is formed on the outer peripheral surface of the lower portion of the large diameter portion 33a.
  • a communication hole 35 is provided at the upper end 33 b 1 of the small diameter portion 33 b of the upper casing 33.
  • the pump 38 is connected to the communication hole 35 via a pipe 36, and fuel is supplied to the internal space 33 c of the upper casing 33 via the communication hole 35.
  • the lower end of the nozzle portion 32b has a tapered shape and is closed by a circular lower end face 32b2.
  • the injection hole 9 penetrating the inclined side surface portion 32b4 is provided in the inclined inclined side surface portion 32b4 connecting the lower end portion of the cylindrical cylindrical side surface portion 32b3 and the lower end surface 32b2.
  • a bolted Langevin 31 is provided inside the lower casing 32 and the upper casing 33, that is, inside the main body portion 34.
  • the bolted Langeban 31 is substantially the same as the bolted Langeban 11 (see FIG. 1) of the first embodiment except that the path 22 (see FIG. 1) is not provided.
  • the horn 12 is provided with a needle 40 which is a valve member so as to be included in the through hole 12 a provided to penetrate in the axial direction.
  • the needle 40 has a bar-shaped valve body portion 40b, a cylindrical intermediate portion 40c provided at the upper end of the valve body portion 40b, and an upper portion of the intermediate portion 40c and has an outer diameter larger than the outer diameter of the intermediate portion 40c. It has a cylindrical head 40a.
  • the head 40a is formed of a magnetic material.
  • a path 40d is formed which communicates from the upper surface of the head 40a to the side surface of the middle portion 40c.
  • the valve body portion 40b has an outer diameter smaller than the inner diameter of the through hole portion 12a, and the head portion 40a and the middle portion 40c have an outer diameter larger than the inner diameter of the through hole portion 12a. Only in the through hole 12a.
  • a gap 23 is formed between the valve body 40 b and the inner peripheral surface of the through hole 12 a. Further, a gap 21 is formed between the outer peripheral surface of the horn 12 and the inner peripheral surface of the nozzle portion 32 b.
  • a cylindrical fuel passage member 41 is provided in contact with the lower surface of the upper end portion 33b1.
  • a through hole 42 is provided in the fuel passage member 41 so as to penetrate the fuel passage member 41 in the axial direction, and the through hole 42 is located coaxially with the communication hole 35.
  • a cylindrical metal insertion member 43 is provided in the inner space 33 c so as to surround the outer periphery of the fuel path member 41. The axial length of the insertion member 43 is longer than the axial length of the fuel passage member 41.
  • a spring 44 having one end connected to the head 40a of the needle 40 and the other end connected to the lower end of the fuel path member 41 is provided inside the through hole 43a that penetrates the insertion member 43 in its axial direction.
  • a cylindrical electromagnet 45 is provided on the outer peripheral surface of the small diameter portion 33 b at a position corresponding to the spring 44.
  • the communication hole 35, the through hole 42, the through hole 43a, the internal space 33c, the path 40d, and the gap 23 constitute a fuel passage.
  • the lower end portion of the valve body portion 40b of the needle 40 has a circular lower end surface 40b1 and the same inclination angle as the inner peripheral surface 32b5 of the inclined side surface portion 32b4 of the nozzle portion 32b
  • An inclined surface 40b2 is provided along the periphery of 40b1.
  • the fuel flows through the piping 36, the communication hole 35, the through hole 42, and the through hole 43a sequentially by the pump 38, and between the insertion member 43 and the head 40a of the needle 40 and the path 40d
  • the internal space 33 c of the upper casing 3 is filled with fuel.
  • the fuel supplied to the internal space 33 c flows into the gap 21 through the gap 23, whereby the inside of the main body 34 is filled with the fuel.
  • the electromagnet 45 When the electromagnet 45 is not energized, the spring 44 pushes the head 40 a of the needle 40 downward by its elastic force. Then, since the needle 40 is pushed downward, the injection hole 9 is blocked by the inclined surface 40b2 of the valve body 40b of the needle 40, and the fuel in the main body 34 does not flow out from the injection hole 9 There is.
  • the fuel in the main body portion 34 is pressurized by the pump 38 and thus is in a pressurized state.
  • the electromagnet 45 In order to inject the fuel from the injection hole 9, the electromagnet 45 is energized. Then, the magnetic force of the electromagnet 45 overcomes the elastic force of the spring 44 and attracts the needle 40 so as to be located inside the electromagnet 45. As a result, the needle 40 is pushed upward, so that the injection hole 9 blocked by the inclined surface 40b2 is opened. The fuel filled in the main body portion 34 is in a state of being pressurized by the pump 38, so the fuel is injected from the injection hole 9 by the pressure.
  • the horn 12 since the horn 12 resonates when the oscillating current of the resonance frequency is supplied to the piezoelectric element 14, the same effect as in the first embodiment can be obtained in the fuel injection device 30. it can.
  • the fuel injection device according to the third embodiment of the present invention has a configuration in which the cylindrical needle includes the horn in the inside with respect to the first embodiment, that is, the horn is disposed radially inward of the needle.
  • the fuel injection device 50 includes a main body 54 including a lower casing 52 and an upper casing 53.
  • the lower casing 52 has a cylindrical fixed portion 52a having an open upper portion and a circular hole 52a1 at the lower portion having a diameter smaller than the diameter of the upper opening, and an outer diameter smaller than the outer diameter of the fixed portion 52a.
  • a cylindrical nozzle portion 52b a cylindrical insertion member 52b1 and an insertion member 52b2 disposed on the insertion member 52b1 are provided in the upper portion of the nozzle 52b, and the nozzle 52b is inserted into the hole 52a1 from the inside of the fixing portion 52a.
  • the lower casing 52 is configured such that the insertion member 52b1 abuts on the inner bottom surface 52a2 of the fixed portion 52a.
  • An internal thread portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixing portion 52a.
  • the lower end portion of the nozzle portion 52b has a tapered shape and is closed by a circular lower end surface 52b2.
  • the lower end portion and the lower end surface 52b2 of the cylindrical side surface 52b3 are connected via the first inclined side surface 52b4 and the second inclined side surface 52b5 having different angles of inclination, and the second inclined side surface 52b5 is formed.
  • the injection hole 9 which penetrates the 2nd inclination side part 52b5 is provided in this.
  • a storage chamber 60 in which the fuel is stored is provided at the lower end inside the nozzle portion 52 b so as to communicate with the injection hole 9.
  • the bolted Lange van 51 includes a horn 62 provided so as to extend from the insertion member 52 b 2 in the lower casing 52 toward the lower end portion inside the nozzle portion 52 b.
  • the horn 62 is provided at the upper end of the first vibrating main body 62a in a rod shape extending in the through hole 55 of the nozzle 52b, and at the upper end of the first vibrating main body 62a and extends in the through hole 55, and the first vibrating main body
  • a second vibrating body 62b having an outer diameter larger than the outer diameter of 62a, a head 62c provided at the upper end of the second vibrating body 62b and having a frusto-conical portion, and a disk provided at the top of the head 62c And a flange portion 62d of a shape.
  • the lower surface of the flange portion 62d is in contact with the upper surface of the insertion member 52b2.
  • the bolt-clamped Lange van 51 includes a plurality of annular piezoelectric elements 64 fixed to the flange portion 62 d by bolts 63.
  • the position of the flange portion 62 d in the horn 62 is a position corresponding to a node of vibration of the horn 62 by the piezoelectric element 64 as in the first embodiment, and this position is determined by a technique known to those skilled in the art. It can be determined by a certain eigenvalue analysis.
  • the length of the horn 62 is also the same as that of the first embodiment.
  • a substantially cylindrical needle 70 which is a valve member, is provided inside the nozzle portion 52b.
  • the needle 70 is composed of a sliding fixing portion 70a in the upper part and a valve body 70b in the lower part, and has a through hole 70c penetrating in the axial direction inside.
  • the slide fixing portion 70 a has a cylindrical shape having an outer diameter of the same size as the diameter of the circular cross section of the through hole 55 of the nozzle 52 b, and can slide the needle 70 into the through hole 55. It is supposed to be fixed.
  • the valve body portion 70b has a cylindrical shape having an outer diameter smaller than the outer diameter of the slide fixing portion 70a, and a gap 81 is formed between the valve body portion 70b and the inner peripheral surface of the nozzle portion 52b. It is formed.
  • the second vibrating body 62b of the horn 62 has an outer diameter of the same size as the diameter of the circular cross section of the through hole 70c of the needle 70, so the needle 70 slides along the second vibrating body 62b. It is being fixed to the 2nd vibration main body 62b so that it may become possible. Since the first vibrating body 62a of the horn 62 has an outer diameter smaller than the outer diameter of the second vibrating body 62b, a gap 82 is formed between the first vibrating body 62a and the inner peripheral surface of the valve body 70b. Is formed.
  • the needle 70 is provided to include the first vibrating main body 62a and the second vibrating main body 62b of the horn 62 inside the through hole 70c, and the first vibrating main body 62a and the second vibrating main body 62b are It can slide up and down along it.
  • a gap is formed between the and the head 62c, and this gap constitutes a pressure chamber 56.
  • the upper portion of the pressure chamber 56 is closed by the flange portion 62d. Further, the pressure chamber 56 and the gap 81 are separated by the sliding fixing portion 70a, and the pressure chamber 56 and the gap 82 are separated by the second vibrating main body 62b.
  • the pressure chamber 56 is provided with a spring 57 that applies an elastic force downward (in the direction of the storage chamber 60) to the upper end surface of the slide fixing portion 70a.
  • the upper casing 53 is provided with a cylindrical upper body 53a, a cylindrical intermediate body 53c provided at the lower end of the upper body 53a and having the same outer diameter as the outer diameter of the upper body 53a, and provided at the lower end of the intermediate body 53c And a cylindrical portion 53b having the same outer diameter as the outer diameter of the main body 53c.
  • a male screw portion (not shown) is formed on the lower outer peripheral surface of the upper main body 53a.
  • the cylindrical portion 53b is inserted into the fixed portion 52a of the lower casing 52 so that the bolt 63 and the piezoelectric element 64 are accommodated in the cylindrical portion 53b, and the male screw portion of the upper main body 53a and the female screw portion of the fixed portion 52a
  • the upper main body 53a and the fixing portion 52a are fixed by screwing together, and the main body portion 54 is configured.
  • the lower end of the cylindrical portion 53b is in contact with the flange portion 62d.
  • the flange portion 62 d is configured to be sandwiched between the insertion member 52 b 2 and the cylindrical portion 53 b, so the flange portion 62 d is fixed to the main body portion 54.
  • An internal space 58 is provided inside the upper main body 53 a and the middle main body 53 c of the upper casing 53.
  • a piezo actuator 71 In the internal space 58, a piezo actuator 71, a control valve portion 72, and a spring 73 are provided.
  • the control valve portion 72 includes a valve body portion 72a having a truncated cone shape portion and a cylindrical shape portion provided thereon, and a rod-like transmission member 72b provided below the valve body portion 72a and extending downward. doing.
  • the transmission member 72b has a first member 72b1, a second member 72b2 and a third member 72b3, which have cylindrical shapes with different outer diameters, and the outer diameter of the second member 72b2 is the largest. It is getting bigger.
  • the internal space 58 has a cylindrical shape having the same diameter as the outer diameter of the second member 72b2 in the region where the second member 72b2 is located, and the second member 72b2 has a region below it as the first space 58a. As the second member 72b2, the second member 72b2 is separated from the upper region.
  • the spring 73 is provided in the first space 58a.
  • the control valve portion 72 can move up and down the internal space 58 according to the difference between the lower force of the piezoelectric actuator 71 and the elastic force of the upper portion of the spring 73, and the frustoconical portion of the valve body portion 72a is
  • the valve body portion 72a is higher than the second member 72b2 of the transmission member 72b.
  • the area below the valve body 72a is separated from the area above the lower valve seat 74 as a second space 58b.
  • valve body portion 72a is a region above the lower valve seat portion 74 and a region below the upper valve seat portion 75 as a third space 58c, and a fourth space 58d above the upper valve seat portion 75. It is supposed to be isolated from
  • the pressure chamber 56 and the third space 58c are communicated with each other by a pressure balance path 91 extending inside the insertion member 52b1, the insertion member 52b2, the cylindrical portion 53b, and the intermediate main body 53c.
  • the first space 58a and the fourth space 58d are communicated with each other by a bypass path 92 extending inside the middle main body 53c and the upper main body 53a.
  • the fourth space 58d communicates with the outside of the upper main body 53a via the fuel discharge path 93, and is not shown with the fourth space 58c via an external pipe (not shown) connected to the fuel discharge path 93. It is in communication with the fuel tank.
  • a fuel retention chamber 95 communicating with the gap 81 is formed in the insertion member 52b1, and the fuel retention chamber 95 is supplied with fuel that extends inside the insertion member 52b1, the insertion member 52b2, the cylindrical portion 53b, and the upper main body 53a.
  • One end of the passage 94 is in communication.
  • the other end of the fuel supply path 94 communicates with the outside of the upper main body 53 a in the upper main body 53 a, and is connected to the fuel supply path 94 via an external pipe (not shown) connected with the other end of the fuel supply path 94. It communicates with a common rail (not shown).
  • the fuel supply passage 94 and the gap 81 constitute a fuel passage.
  • the fuel supply path 94 is in communication with the second space 58 b of the internal space 58 via the branch path 96.
  • a circular lower end surface 62a1 having a diameter smaller than the outer diameter of the first vibrating body 62a is formed, and the lower end surface 62a1 is , Located in the storage chamber 60.
  • the lower end portion of the valve body portion 70b of the needle 70 is provided with an inclined surface 70b2 having the same inclination angle as the inner peripheral surface 52b6 of the first inclined side surface portion 52b4 of the nozzle portion 52b and formed along the periphery of the lower end. ing.
  • valve chamber 70b of the needle 70 causes the interior of the nozzle 52b to form the reservoir 60 and the gap 82 It is supposed to be separated by 81 and so on. That is, in this state, the injection hole 9 and the fuel passage are shut off.
  • the operation of the fuel injection device according to the third embodiment will be described based on FIGS.
  • the needle 70 is pushed downward by the elastic force of the spring 57, and the injection hole 9 and the fuel passage are disconnected. There is.
  • the control valve portion 72 is pushed upward by the elastic force of the spring 73, and the valve body portion 72a abuts on the upper valve seat portion 75, and the third space 58c and the fourth space 58c The space 58d is in a separated state.
  • the fuel in the common rail (not shown) is supplied into the fuel supply path 94, the fuel is filled in the fuel retention chamber 95 and the gap 81.
  • a part of the fuel flowing through the fuel supply passage 94 flows into the second space 58 b via the branch passage 96.
  • the valve body portion 72a abuts on the upper valve seat portion 75, and the second space 58b and the third space 58c communicate with each other, so the fuel also flows into the third space 58c.
  • the fuel flowing into the third space 58 c further flows into the pressure chamber 56 via the pressure balance path 91.
  • both the inside of the pressure chamber 56 and the inside of the fuel retention chamber 95 have the same pressure because they are filled with high-pressure fuel from the common rail, the needle 70 is pushed downward only by the elastic force of the spring 57. And the injection hole 9 is closed.
  • the piezo actuator 71 is driven to push down the control valve portion 72, and the truncated cone shaped portion of the valve body portion 72a abuts on the lower valve seat portion 74 to separate the second space 58b from the third space 58c. Since the third space 58c communicates with the fourth space 58d, the fuel in the pressure chamber 56 flows in the pressure balance path 91, the third space 58c, the fourth space 58d, and the fuel discharge path 93 sequentially. Flows out to a fuel tank (not shown). As a result, the pressure in the pressure chamber 56 becomes approximately equal to the pressure in the fuel tank.
  • the horn 62 When the piezoelectric actuator 71 is driven, the horn 62 resonates by supplying the oscillating current of the resonance frequency to the piezoelectric element 64. Due to the vibration of the horn 62, the high pressure fuel in the gap 82 vibrates. Further, the horn 62 is provided with a flange 62d at a position corresponding to a node of vibration, and the flange 62d is fixed to the main body 54, so that the tip of the horn 62 corresponding to the antinode of vibration is Since the lower end face 62a1 located in the storage chamber 60 vibrates greatly, the high pressure fuel in the storage chamber 60 generates cavitation and flow rate fluctuation, and the fuel injected from the injection hole 9 is atomized. Also in the fuel injection device 50, the tip end of the horn 62 corresponding to the antinode of vibration vibrates largely, so that the same effect as that of the first embodiment can be obtained.
  • the piezoelectric element is a bolted Lange van fixed to the horn by a bolt
  • the present invention is not limited to this.
  • the fixing method may be any method, for example, the piezoelectric element may be bonded to the horn by an adhesive or the like.
  • the entire outer periphery of the needle is surrounded by the horn
  • the entire outer periphery of the horn is surrounded by the needle.
  • the present invention is not limited to this configuration.
  • a portion of the outer periphery of the needle may be disposed radially inward of the horn
  • a portion of the outer periphery of the horn may be disposed radially inward of the needle It may be a configuration.

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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

A bolted Langevin vibrator (11) is provided within a body section (4). The bolted Langevin vibrator (11) is provided with a cylindrical horn (12), a circular disc-shaped flange (13) which is provided to the horn (12), and a circular annular piezoelectric elements (14). The flange (13) is affixed to the body section (4) by being sandwiched between a rim (2b1) of a nozzle (2b) and the lower end of an upper casing (3). The piezoelectric elements (14) are bolted on the flange (13) with the horn (12) inserted in the holes of the piezoelectric elements (14). The horn (12) is adapted to be vibrated by the piezoelectric elements (14), and the flange (13) is provided at the position corresponding to a node of the vibration.

Description

燃料噴射装置Fuel injection device
　この発明は、燃料噴射装置に係り、特に、ボルト締めランジュバン振動子により燃料を振動させて微粒化する燃料噴射装置に関する。 The present invention relates to a fuel injection device, and more particularly to a fuel injection device that vibrates and atomizes fuel by a bolt-clamped Langevin vibrator.
　内燃機関において、燃料噴射装置から液体燃料を噴射させて燃焼させる場合、燃焼性は燃料の微粒化に大きな影響を受ける。そこで、噴射される燃料の粒径の均一性を高めることを目的として、弁の開閉に使用されるピエゾアクチュエータを利用し、ニードルを周期的に変動させて燃料に圧力変動を起こす燃料噴射装置が特許文献１に記載されている。 In the internal combustion engine, when the liquid fuel is injected from the fuel injection device for combustion, the flammability is greatly affected by the atomization of the fuel. Therefore, in order to improve the uniformity of the particle size of the injected fuel, a fuel injection device that causes pressure fluctuation in the fuel by periodically changing the needle using a piezoelectric actuator used for opening and closing the valve is known. It is described in patent document 1.
特開２００８－１４１７２号公報JP, 2008-14172, A
　しかしながら、ピエゾアクチュエータは一般に長く体積が大きいので、共振点が低い。そのため、最近のコモンレールで採用されている非常に短時間（１～１．５ミリ秒）の噴射では、十分な振動回数が得られないといった問題点があった。また、共振により素子が破壊するおそれがあるため、電力を大きくできず、その結果、微粒化効果が小さくなるといった問題点もあった。尚、ピエゾアクチュエータの共振を利用しなければこのような問題は生じないが、この場合には、振幅が大きくとれないため、微粒化効果がほとんどなくなってしまう。 However, since the piezo actuator is generally long and large in volume, the resonance point is low. Therefore, there has been a problem that the number of oscillations can not be obtained sufficiently in the very short time (1 to 1.5 milliseconds) of injection employed in recent common rails. In addition, since the element may be broken due to resonance, the power can not be increased, and as a result, there is a problem that the atomization effect is reduced. Although such a problem does not occur unless the resonance of the piezoelectric actuator is used, in this case, since the amplitude can not be large, the atomization effect is almost lost.
　この発明はこのような問題点を解決するためになされたもので、噴射される燃料の微粒化効果を向上した燃料噴射装置を提供することを目的とする。 The present invention has been made to solve such problems, and it is an object of the present invention to provide a fuel injection device in which the atomization effect of the injected fuel is improved.
　この発明に係る燃料噴射装置は、燃料が噴射される噴孔及び噴孔に連通する燃料通路が設けられた本体部と、本体部の内部に設けられ、噴孔と燃料通路とを連通または遮断する弁部材と、燃料通路に設けられたホーンと、ホーンを振動させる振動子とを備え、ホーンには、本体部に対して固定されるフランジ部が形成され、フランジ部は、ホーンの振動の節に相当する位置に設けられる。 The fuel injection device according to the present invention is provided in the main body portion provided with the injection hole through which the fuel is injected and the fuel passage communicating with the injection hole, and is provided inside the main body portion to connect or block the injection hole and the fuel passage. And a horn provided in the fuel passage, and a vibrator for vibrating the horn, wherein the horn is formed with a flange portion fixed to the main body portion, and the flange portion is for vibration of the horn. It is provided at a position corresponding to a clause.
　この発明によれば、ホーンの振動の節に相当する位置に設けられたフランジ部が本体部に固定されていることにより、弁部材が噴孔と燃料通路とを連通したときに、ホーンを共振させると、ホーンの先端が大きく振動し、燃料にキャビテーションや流量変動を発生させるので、噴孔から噴射される燃料の微粒化を向上することができる。 According to the present invention, the flange portion provided at the position corresponding to the vibration node of the horn is fixed to the main body, so that when the valve member communicates the injection hole with the fuel passage, the horn resonates. Then, the tip of the horn vibrates to a large extent, causing cavitation and flow rate fluctuation in the fuel, so that the atomization of the fuel injected from the injection hole can be improved.
この発明の実施の形態１に係る燃料噴射装置の断面図である。It is sectional drawing of the fuel-injection apparatus based on Embodiment 1 of this invention. 実施の形態１に係る燃料噴射装置の先端部分の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a tip portion of the fuel injection device according to Embodiment 1. 実施の形態２に係る燃料噴射装置の断面図である。7 is a cross-sectional view of a fuel injection device according to Embodiment 2. FIG. 実施の形態２に係る燃料噴射装置の先端部分の拡大断面図である。FIG. 10 is an enlarged cross-sectional view of a tip portion of a fuel injection device according to Embodiment 2. 実施の形態３に係る燃料噴射装置の断面図である。FIG. 10 is a cross-sectional view of a fuel injection device according to Embodiment 3. 実施の形態３に係る燃料噴射装置の先端部分の拡大断面図である。FIG. 10 is an enlarged cross-sectional view of a tip portion of a fuel injection device according to Embodiment 3.
　以下、この発明の実施の形態を添付図面に基づいて説明する。
実施の形態１．
　この発明の実施の形態１に係る燃料噴射装置の構成を図１に示す。燃料噴射装置１は、下部ケーシング２と上部ケーシング３とからなる本体部４を備えている。下部ケーシング２は、上部が開口すると共に上部の開口の直径よりも小さな直径の円形の穴２ａ１が下部に形成された円筒形状の固定部２ａと、固定部２ａの外径よりも小さな外径を有する円筒形状のノズル部２ｂとから構成されている。ノズル部２ｂの上端には、円環状の縁部２ｂ１が設けられており、ノズル部２ｂが固定部２ａの内部から穴２ａ１に挿入されて縁部２ｂ１が固定部２ａの内部底面２ａ２に当接するようにして、下部ケーシング２が構成されている。下部ケーシング２の固定部２ａの上部の開口付近の内周面には、図示しない雌ねじ部が形成されている。上部ケーシング３は、上部が閉じると共に下部が開口した円筒形状を有しており、下部の外周面には、図示しない雄ねじ部が形成されている。下部ケーシング２の雌ねじ部と、上部ケーシング３の雄ねじ部とが螺合することにより、下部ケーシング２と上部ケーシング３とが固定されて本体部４が構成されている。上部ケーシング３の側面には、連通孔５が設けられており、連通孔５に配管６を介して、コモンレール７及びポンプ８が接続されており、コモンレール７内の燃料が連通孔５を介して上部ケーシング３の内部空間３ａに供給されるようになっている。 Hereinafter, an embodiment of the present invention will be described based on the attached drawings.
Embodiment 1
The configuration of the fuel injection device according to the first embodiment of the present invention is shown in FIG. The fuel injection device 1 includes a main body 4 including a lower casing 2 and an upper casing 3. The lower casing 2 has a cylindrical fixed portion 2a in which an upper portion is opened and a circular hole 2a1 having a diameter smaller than the diameter of the upper portion is formed at the lower portion, and an outer diameter smaller than the outer diameter of the fixed portion 2a. It comprises from the cylindrical nozzle part 2b which it has. An annular edge portion 2b1 is provided at the upper end of the nozzle portion 2b, and the nozzle portion 2b is inserted into the hole 2a1 from the inside of the fixed portion 2a and the edge portion 2b1 abuts on the inner bottom surface 2a2 of the fixed portion 2a Thus, the lower casing 2 is configured. An internal thread portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixed portion 2 a of the lower casing 2. The upper casing 3 has a cylindrical shape in which the upper portion is closed and the lower portion is opened, and an external thread portion (not shown) is formed on the outer peripheral surface of the lower portion. By screwing the female screw portion of the lower casing 2 and the male screw portion of the upper casing 3, the lower casing 2 and the upper casing 3 are fixed to constitute the main body 4. A communication hole 5 is provided on the side surface of the upper casing 3, and the common rail 7 and the pump 8 are connected to the communication hole 5 via the pipe 6, and the fuel in the common rail 7 is connected via the communication hole 5. The internal space 3a of the upper casing 3 is supplied.
　ノズル部２ｂの下端部は、先細り形状を有すると共に円形の下部端面２ｂ２で閉じている。円筒形状の円筒側面部２ｂ３の下端部と下部端面２ｂ２とを接続する傾斜した傾斜側面部２ｂ４に、傾斜側面部２ｂ４を貫通する噴孔９が設けられている。ノズル部２ｂの内部の下端には、噴孔９と連通するように、燃料が貯留される貯留室１０が設けられている。 The lower end portion of the nozzle portion 2b has a tapered shape and is closed by a circular lower end surface 2b2. An injection hole 9 penetrating the inclined side surface portion 2b4 is provided in the inclined inclined side surface portion 2b4 connecting the lower end portion of the cylindrical cylindrical side surface portion 2b3 and the lower end surface 2b2. A storage chamber 10 in which the fuel is stored is provided at the lower end inside the nozzle portion 2 b so as to communicate with the injection hole 9.
　下部ケーシング２及び上部ケーシング３の内部、すなわち、本体部４の内部には、ボルト締めランジュバン１１が設けられている。ボルト締めランジュバン１１は、上部ケーシング３の内部空間３ａから下部ケーシング２の内部の下端部に向かって延びるように設けられた円筒状のホーン１２と、ホーン１２に設けられた円盤形状のフランジ部１３と、ホーン１２を振動させる振動子である複数枚の円環状の圧電素子１４とを備えている。圧電素子１４は、チタン酸ジルコン酸鉛（ＰＺＴ）から形成され、ホーン１２は、スチールから形成されている。尚、ホーン１２は、アルミニウムから形成されてもよい。ホーン１２の外径は、ノズル部２ｂの内径よりも小さいので、ホーン１２の外周面とノズル部２ｂの内周面との間には、隙間２１が構成されている。フランジ部１３は、ノズル部２ｂの縁部２ｂ１と上部ケーシング３の下端部とに挟まれることによって本体部４に対して固定されている。圧電素子１４は、圧電素子１４の穴にホーン１２が挿入されるようにしてフランジ部１３に対してボルトで固定されている。 Inside the lower casing 2 and the upper casing 3, that is, inside the main body portion 4, bolted Langevin 11 is provided. The bolted Langevin 11 has a cylindrical horn 12 provided so as to extend from the inner space 3 a of the upper casing 3 toward the lower end of the inner portion of the lower casing 2, and a disk shaped flange portion 13 provided on the horn 12. And a plurality of annular piezoelectric elements 14 which are vibrators for vibrating the horn 12. The piezoelectric element 14 is formed of lead zirconate titanate (PZT), and the horn 12 is formed of steel. The horn 12 may be formed of aluminum. Since the outer diameter of the horn 12 is smaller than the inner diameter of the nozzle portion 2b, a gap 21 is formed between the outer peripheral surface of the horn 12 and the inner peripheral surface of the nozzle portion 2b. The flange portion 13 is fixed to the main body portion 4 by being pinched between the edge portion 2 b 1 of the nozzle portion 2 b and the lower end portion of the upper casing 3. The piezoelectric element 14 is bolted to the flange portion 13 so that the horn 12 is inserted into the hole of the piezoelectric element 14.
　ここで、ホーン１２におけるフランジ部１３の位置について説明する。ホーン１２は、圧電素子１４によって振動するが、この振動の節に相当する位置にフランジ部１３が設けられ、ホーン１２の先端が振動の腹になるようにホーン１２の長さが設定されている。振動の節に相当する位置及びホーン１２の長さは、当業者に周知の技術である固有値解析により求めることができる。 Here, the position of the flange portion 13 in the horn 12 will be described. The horn 12 is vibrated by the piezoelectric element 14, and the flange portion 13 is provided at a position corresponding to a node of the vibration, and the length of the horn 12 is set so that the tip of the horn 12 becomes an antinode of the vibration. . The position corresponding to the node of vibration and the length of the horn 12 can be determined by eigen value analysis which is a technique well known to those skilled in the art.
　ホーン１２の上端部分が内部に挿入されるようにして、円筒形状のシリンダ部材１５がホーン１２に取り付けられている。シリンダ部材１５の内部には、上下方向に摺動可能なピストン部材１６が設けられており、ピストン部材１６に接するように、ピストン部材１６を下方に摺動させるピエゾアクチュエータ１７が設けられている。ホーン１２と、シリンダ部材１５と、ピストン部材１６とによって、シリンダ部材１５の内部に、上部ケーシング３の内部空間３ａと隔離された圧力室１８が形成されている。シリンダ部材１５には、内部空間３ａと圧力室１８とを連通する小孔１９が設けられている。小孔１９は、シリンダ部材１５内をピストン部材１６が下方に摺動していくと、ピストン部材１６によって塞がれて、内部空間３ａと圧力室との連通が遮断されるようになっている。 A cylindrical cylinder member 15 is attached to the horn 12 so that the upper end portion of the horn 12 is inserted therein. A piston member 16 slidable in the vertical direction is provided inside the cylinder member 15, and a piezo actuator 17 that slides the piston member 16 downward is provided so as to be in contact with the piston member 16. A pressure chamber 18 separated from the internal space 3 a of the upper casing 3 is formed in the cylinder member 15 by the horn 12, the cylinder member 15 and the piston member 16. The cylinder member 15 is provided with a small hole 19 communicating the internal space 3 a with the pressure chamber 18. The small hole 19 is closed by the piston member 16 as the piston member 16 slides downward in the cylinder member 15, and the communication between the internal space 3a and the pressure chamber is interrupted. .
　ホーン１２には、その軸方向に貫通するように設けられた貫通穴部１２ａ内に含まれるようにして、弁部材であるニードル２０が設けられている。ニードル２０は、上方部分の摺動固定部２０ａと、下方部分の弁体部２０ｂとから構成されている。摺動固定部２０ａは、貫通穴部１２ａの内径と同じ大きさの外径の円柱形状を有して、ニードル２０を貫通穴部１２ａ内に摺動可能に固定すると共に、圧力室１８と、貫通穴部１２ａのうち摺動固定部２０ａよりも下方の領域とを隔離するようになっている。弁体部２０ｂは、摺動固定部２０ａの外径よりも小さな外径を有する円柱形状を有している。圧力室１８には、一端がピストン部材１６に接続されると共に他端が摺動固定部２０ａに接続されたスプリング２４が設けられている。弁体部２０ｂと、貫通穴部１２ａの内周面との間には、隙間２３が構成されている。隙間２３は、経路２２を介して、上部ケーシング３の内部空間３ａと連通されている。ここで、連通孔５と、内部空間３ａと、経路２２と、隙間２３とは、燃料が流通する燃料通路を構成する。ニードル２０は、圧力室１８内の圧力によって、貫通穴部１２ａ内を上下方向に摺動するようになっている。弁体部２０ｂと貫通穴部１２ａの内周面との間に隙間２３が形成されていることにより、ニードル２０は、ホーン１２と干渉しないで摺動することができる。 The horn 12 is provided with a needle 20 which is a valve member so as to be included in a through hole 12 a provided to penetrate in the axial direction. The needle 20 is composed of a sliding fixing portion 20a in the upper portion and a valve body portion 20b in the lower portion. The slide fixing portion 20a has a cylindrical shape having an outer diameter the same size as the inner diameter of the through hole 12a, and slidably fixes the needle 20 in the through hole 12a, and the pressure chamber 18; The through hole 12a is separated from the region below the sliding fixing portion 20a. The valve body portion 20b has a cylindrical shape having an outer diameter smaller than the outer diameter of the slide fixing portion 20a. The pressure chamber 18 is provided with a spring 24 having one end connected to the piston member 16 and the other end connected to the slide fixing portion 20a. A gap 23 is formed between the valve body portion 20b and the inner peripheral surface of the through hole 12a. The gap 23 is in communication with the internal space 3 a of the upper casing 3 via the passage 22. Here, the communication hole 5, the internal space 3a, the path 22, and the gap 23 constitute a fuel passage through which the fuel flows. The needle 20 slides up and down in the through hole 12 a by the pressure in the pressure chamber 18. By forming the gap 23 between the valve body 20 b and the inner circumferential surface of the through hole 12 a, the needle 20 can slide without interfering with the horn 12.
　図２に示されるように、ニードル２０の弁体部２０ｂの下端部分には、円形の下部端面２０ｂ１と、ノズル部２ｂの傾斜側面部２ｂ４の内周面２ｂ５と同じ傾斜角を有すると共に下部端面２０ｂ１の周囲に沿って形成された傾斜面２０ｂ２とが設けられている。下部端面２０ｂ１の直径は、貯留室１０内の上方の開口と同じ直径となっている。エンジン停止時には、スプリング２４（図１参照）の弾性力によってニードル２０が下方に摺動し、傾斜面２０ｂ２と内周面２ｂ５とが重なり合うように接触する。すると、ノズル部２ｂの内部の空間は、ニードル２０によって、貯留室１０と、貯留室１０よりも上方の空間とに隔離されるようになる。この状態では、噴孔９と燃料通路とが遮断された状態となっている。 As shown in FIG. 2, the lower end portion of the valve body portion 20b of the needle 20 has a circular lower end surface 20b1 and the same inclination angle as the inner peripheral surface 2b5 of the inclined side portion 2b4 of the nozzle portion 2b An inclined surface 20b2 is provided along the periphery of 20b1. The diameter of the lower end surface 20b1 is the same as the diameter of the upper opening in the storage chamber 10. When the engine is stopped, the needle 20 slides downward by the elastic force of the spring 24 (see FIG. 1), and the inclined surface 20b2 and the inner circumferential surface 2b5 contact each other in an overlapping manner. Then, the space inside the nozzle portion 2 b is separated by the needle 20 into the storage chamber 10 and the space above the storage chamber 10. In this state, the injection hole 9 and the fuel passage are shut off.
　次に、この実施の形態１に係る燃料噴射装置の動作を、図１及び２に基づいて説明する。
　コモンレール７内には、ポンプ８により圧送された燃料が貯留されており、この燃料が配管６及び連通孔５を介して、上部ケーシング３の内部空間３ａに供給される。内部空間３ａに供給された燃料は、小孔１９を介して圧力室１８内に流入すると共に、経路２２を介して隙間２３及び２１に流入することにより、本体部４の内部が燃料で充填される。 Next, the operation of the fuel injection device according to the first embodiment will be described based on FIGS.
The fuel pumped by the pump 8 is stored in the common rail 7, and the fuel is supplied to the internal space 3 a of the upper casing 3 through the pipe 6 and the communication hole 5. The fuel supplied to the internal space 3a flows into the pressure chamber 18 through the small holes 19, and flows into the gaps 23 and 21 through the passage 22, whereby the inside of the main body 4 is filled with the fuel. Ru.
　ピエゾアクチュエータ１７に電流が通電されると、ピエゾアクチュエータ１７がピストン部材１６を下方に押し下げる。すると、圧力室１８内の燃料は、小孔１９を介して内部空間３ａに排出されるが、ピストン部材１６が小孔１９を塞ぐ位置まで押し下げられると、圧力室１８内の燃料は排出されなくなり、この状態でピストン部材１６がさらに下方に押されると、圧力室１８内の圧力が上昇し、この圧力によってニードル２０の摺動固定部２０ａが下方に押され、ニードル２０が下方に押し下げられる。その結果、下部ケーシング２の内部の空間は、ニードル２０によって、貯留室１０と、貯留室１０よりも上方の空間とに隔離されるので、この状態では、本体部４内の燃料は、噴孔９から流出しない。 When current is applied to the piezo actuator 17, the piezo actuator 17 pushes the piston member 16 downward. Then, the fuel in the pressure chamber 18 is discharged to the internal space 3a through the small hole 19, but when the piston member 16 is pushed down to the position where the small hole 19 is closed, the fuel in the pressure chamber 18 is not discharged. In this state, when the piston member 16 is pushed further downward, the pressure in the pressure chamber 18 rises, and the sliding fixing portion 20a of the needle 20 is pushed downward by this pressure, and the needle 20 is pushed downward. As a result, since the space inside the lower casing 2 is isolated by the needle 20 into the storage chamber 10 and the space above the storage chamber 10, in this state, the fuel in the main body 4 is an injection hole It does not leak from 9
　噴孔９から燃料を噴射させるには、ピエゾアクチュエータ１７への通電を停止し、ピエゾアクチュエータ１７によるピストン部材１６の押し下げを停止する。すると、圧力室１８内の圧力によってピストン部材１６が上方に押し上げられ、これに伴い、圧力室１８内の圧力が低下する。すると、隙間２１及び２３内の圧力と圧力室１８内の圧力との圧力差が、スプリング２４の弾性力より大きくなり、その結果、ニードル２０が上方に移動し、貯留室１０と、貯留室１０よりも上方の空間とが連通するので、貯留室１０へ燃料が流入し、噴孔９から燃料が噴射される。 In order to inject the fuel from the injection hole 9, the energization of the piezo actuator 17 is stopped, and the depression of the piston member 16 by the piezo actuator 17 is stopped. Then, the pressure in the pressure chamber 18 pushes the piston member 16 upward, which causes the pressure in the pressure chamber 18 to decrease. Then, the pressure difference between the pressure in the gaps 21 and 23 and the pressure in the pressure chamber 18 becomes larger than the elastic force of the spring 24. As a result, the needle 20 moves upward, and the storage chamber 10 and the storage chamber 10 Since the upper space is in communication, fuel flows into the storage chamber 10 and fuel is injected from the injection holes 9.
　噴孔９から燃料が断続的に噴射される状態である燃料供給時には、圧電素子１４に対して電流が連続的に通電される。そして、例えばフューエルカット時のように噴孔９から燃料が噴射されない状態が続く場合には、圧電素子１４に対して電流は通電されない。圧電素子１４に共振周波数の振動電流が通電されることにより、ホーン１２は共振する。ホーン１２の振動により、隙間２１及び２３内の燃料が振動する。また、ホーン１２には、振動の節に相当する位置にフランジ部１３が設けられ、ホーン１２は、その先端が振動の腹になる長さに設定されているので、噴孔９付近、例えば貯留室１０内の燃料において、キャビテーションや流量変動が発生し、噴孔９から噴射されるときに燃料が微粒化する。微粒化した燃料の粒径は、ホーン１２の周波数に逆比例して小さくなるので、ホーン１２の先端が振動の腹になるようにすることにより、燃料の微粒化効果が向上する。また、ホーン１２の共振により振幅が大きくなるので、燃料噴射の周期的変動効果も見込め、エントレイン効果により燃料と空気との混合を促進し、燃焼性の改善も期待できる。さらに、燃料はこのような作用を受けながら噴孔９から噴射されるので、噴孔９のつまり防止効果も期待できる。尚、噴孔９から燃料が噴射されるタイミングだけ圧電素子１４に電流が流れるように、圧電素子１４に対して電流を断続的に通電するようにしてもよい。ただし、断続的に通電する場合には、通電制御のやり方によっては共振が起こらなくなる場合があり、通電制御が少し難しくなる。 At the time of fuel supply in a state where fuel is intermittently injected from the injection holes 9, current is continuously supplied to the piezoelectric element. Then, for example, when the fuel is not injected from the injection holes 9 as in the fuel cut, the current is not supplied to the piezoelectric element 14. The horn 12 resonates by supplying the oscillating current of the resonance frequency to the piezoelectric element 14. The vibration of the horn 12 causes the fuel in the gaps 21 and 23 to vibrate. Further, the horn 12 is provided with the flange portion 13 at a position corresponding to a node of vibration, and the horn 12 is set to a length at which the tip thereof becomes the antinode of vibration. Cavitation and flow rate fluctuation occur in the fuel in the chamber 10, and when injected from the injection hole 9, the fuel is atomized. Since the particle size of the atomized fuel decreases in inverse proportion to the frequency of the horn 12, the atomization effect of the fuel is improved by making the tip of the horn 12 be the antinode of vibration. Further, since the amplitude is increased due to the resonance of the horn 12, the periodic fluctuation effect of the fuel injection can be expected, the mixing of the fuel and the air can be promoted by the entraining effect, and the improvement of the combustibility can be expected. Furthermore, since fuel is injected from the injection hole 9 while receiving such an action, the clogging prevention effect of the injection hole 9 can also be expected. The current may be intermittently supplied to the piezoelectric element 14 so that the current flows to the piezoelectric element 14 only at the timing when the fuel is injected from the injection hole 9. However, when conducting electricity intermittently, depending on the way of conducting control, resonance may not occur and conducting control becomes somewhat difficult.
　このように、ホーン１２の振動の節に相当する位置に設けられたフランジ部１３が本体部４に対して固定されていることにより、ニードル２０が噴孔９と燃料通路とを連通したときに、ホーン１２を共振させると、振動の腹に相当するホーン１２の先端が大きく振動し、燃料にキャビテーションや流量変動を発生させるので、噴孔９から噴射される燃料の微粒化を向上することができる。 Thus, when the flange portion 13 provided at the position corresponding to the vibration node of the horn 12 is fixed to the main body portion 4, the needle 20 communicates the injection hole 9 with the fuel passage. When the horn 12 is made to resonate, the tip of the horn 12 corresponding to the antinode of vibration vibrates largely, causing cavitation and flow rate fluctuation in the fuel, so that the atomization of the fuel injected from the injection hole 9 can be improved. it can.
実施の形態２．
　次に、この発明の実施の形態２に係る燃料噴射装置について説明する。尚、以下の実施の形態において、図１及び２の参照符号と同一の符号は、同一又は同様な構成要素であるので、その詳細な説明は省略する。
　この発明の実施の形態２に係る燃料噴射装置は、実施の形態１に対して、ニードルの移動機構を変更したものである。この実施の形態２に係る燃料噴射装置は、ガソリンエンジンや排気燃料添加用の低圧インジェクタ（例えば１０ＭＰａ以下）に用いられる。 Second Embodiment
Next, a fuel injection device according to Embodiment 2 of the present invention will be described. In the following embodiments, the same reference numerals as the reference numerals in FIGS. 1 and 2 denote the same or similar constituent elements, and thus the detailed description thereof will be omitted.
The fuel injection device according to Embodiment 2 of the present invention is different from Embodiment 1 in that the moving mechanism of the needle is changed. The fuel injection device according to the second embodiment is used for a gasoline engine or a low pressure injector (for example, 10 MPa or less) for adding an exhaust fuel.
　図３に示されるように、燃料噴射装置３０は、下部ケーシング３２と上部ケーシング３３とからなる本体部３４を備えている。下部ケーシング３２は、上部が開口すると共に上部の開口の直径よりも小さな直径の円形の穴３２ａ１が下部に形成された円筒形状の固定部３２ａと、固定部３２ａの外径よりも小さな外径を有する円筒形状のノズル部３２ｂとから構成されている。ノズル部３２ｂの上端には、円環状の縁部３２ｂ１が設けられており、ノズル部３２ｂが固定部３２ａの内部から穴３２ａ１に挿入されて縁部３２ｂ１が固定部３２ａの内部底面３２ａ２に当接するようにして、下部ケーシング３２が構成されている。下部ケーシング３２の固定部３２ａの上部の開口付近の内周面には、図示しない雌ねじ部が形成されている。上部ケーシング３３は、上端部３３ｂ１が閉じた円筒形状の小径部３３ｂと、下部が開口すると共に小径部３３ｂの外径よりも大きな外径の円筒形状の大径部３３ａとを有しており、大径部３３ａの下部の外周面には、図示しない雄ねじ部が形成されている。下部ケーシング３２の雌ねじ部と、上部ケーシング３３の雄ねじ部とが螺合することにより、上部ケーシング３３と下部ケーシング３２とが固定されて本体部３４が構成されている。上部ケーシング３３の小径部３３ｂの上端部３３ｂ１には、連通孔３５が設けられている。連通孔３５には、配管３６を介して、ポンプ３８が接続されており、連通孔３５を介して上部ケーシング３３の内部空間３３ｃに燃料が供給されるようになっている。 As shown in FIG. 3, the fuel injection device 30 includes a main body 34 including a lower casing 32 and an upper casing 33. The lower casing 32 has a cylindrical fixing portion 32a having an opening at the top and a circular hole 32a1 having a diameter smaller than the diameter of the opening at the bottom, and an outer diameter smaller than the outer diameter of the fixing portion 32a. It comprises from the cylindrical nozzle part 32b which it has. An annular edge portion 32b1 is provided at the upper end of the nozzle portion 32b, and the nozzle portion 32b is inserted into the hole 32a1 from the inside of the fixing portion 32a, and the edge portion 32b1 abuts on the inner bottom surface 32a2 of the fixing portion 32a. Thus, the lower casing 32 is configured. A female screw portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixed portion 32 a of the lower casing 32. The upper casing 33 has a cylindrical small diameter portion 33b whose upper end 33b1 is closed, and a cylindrical large diameter portion 33a which is open at the bottom and has an outer diameter larger than the outer diameter of the small diameter portion 33b. A male screw portion (not shown) is formed on the outer peripheral surface of the lower portion of the large diameter portion 33a. By screwing the female screw portion of the lower casing 32 and the male screw portion of the upper casing 33, the upper casing 33 and the lower casing 32 are fixed to constitute the main body portion 34. A communication hole 35 is provided at the upper end 33 b 1 of the small diameter portion 33 b of the upper casing 33. The pump 38 is connected to the communication hole 35 via a pipe 36, and fuel is supplied to the internal space 33 c of the upper casing 33 via the communication hole 35.
　ノズル部３２ｂの下端部は、先細り形状を有すると共に円形の下部端面３２ｂ２で閉じている。円筒形状の円筒側面部３２ｂ３の下端部と下部端面３２ｂ２とを接続する傾斜した傾斜側面部３２ｂ４に、傾斜側面部３２ｂ４を貫通する噴孔９が設けられている。下部ケーシング３２及び上部ケーシング３３の内部、すなわち、本体部３４の内部には、ボルト締めランジュバン３１が設けられている。ボルト締めランジュバン３１は、経路２２（図１参照）が設けられていない点以外は、実施の形態１のボルト締めランジュバン１１（図１参照）の構成とほぼ同じである。 The lower end of the nozzle portion 32b has a tapered shape and is closed by a circular lower end face 32b2. The injection hole 9 penetrating the inclined side surface portion 32b4 is provided in the inclined inclined side surface portion 32b4 connecting the lower end portion of the cylindrical cylindrical side surface portion 32b3 and the lower end surface 32b2. Inside the lower casing 32 and the upper casing 33, that is, inside the main body portion 34, a bolted Langevin 31 is provided. The bolted Langeban 31 is substantially the same as the bolted Langeban 11 (see FIG. 1) of the first embodiment except that the path 22 (see FIG. 1) is not provided.
　ホーン１２には、その軸方向に貫通するように設けられた貫通穴部１２ａ内に含まれるようにして、弁部材であるニードル４０が設けられている。ニードル４０は、棒状の弁体部４０ｂと、弁体部４０ｂの上端に設けられた円柱形状の中間部４０ｃと、中間部４０ｃの上部に設けられ中間部４０ｃの外径よりも大きな外形を有する円柱形状の頭部４０ａとから構成されている。頭部４０ａは、磁性体で形成されている。頭部４０ａ及び中間部４０ｃには、頭部４０ａの上面から中間部４０ｃの側面にかけて連通する経路４０ｄが形成されている。弁体部４０ｂは、貫通穴部１２ａの内径よりも小さい外径を有すると共に、頭部４０ａ及び中間部４０ｃは、貫通穴部１２ａの内径よりも大きい外径を有することにより、弁体部４０ｂのみが貫通穴部１２ａ内に挿入されている。弁体部４０ｂと、貫通穴部１２ａの内周面との間には、隙間２３が構成されている。また、ホーン１２の外周面とノズル部３２ｂの内周面との間には、隙間２１が構成されている。 The horn 12 is provided with a needle 40 which is a valve member so as to be included in the through hole 12 a provided to penetrate in the axial direction. The needle 40 has a bar-shaped valve body portion 40b, a cylindrical intermediate portion 40c provided at the upper end of the valve body portion 40b, and an upper portion of the intermediate portion 40c and has an outer diameter larger than the outer diameter of the intermediate portion 40c. It has a cylindrical head 40a. The head 40a is formed of a magnetic material. In the head 40a and the middle portion 40c, a path 40d is formed which communicates from the upper surface of the head 40a to the side surface of the middle portion 40c. The valve body portion 40b has an outer diameter smaller than the inner diameter of the through hole portion 12a, and the head portion 40a and the middle portion 40c have an outer diameter larger than the inner diameter of the through hole portion 12a. Only in the through hole 12a. A gap 23 is formed between the valve body 40 b and the inner peripheral surface of the through hole 12 a. Further, a gap 21 is formed between the outer peripheral surface of the horn 12 and the inner peripheral surface of the nozzle portion 32 b.
　上部ケーシング３３の内部空間３３ｃには、上端部３３ｂ１の下面に接するように、円筒形状の燃料経路部材４１が設けられている。燃料経路部材４１をその軸線方向に貫通するように、燃料経路部材４１に貫通穴部４２が設けられ、貫通穴部４２は、連通孔３５と同軸状に位置している。また、内部空間３３ｃには、燃料経路部材４１の外周を囲むように、円筒形状の金属製の内挿部材４３が設けられている。内挿部材４３の軸線方向の長さは、燃料経路部材４１の軸線方向の長さよりも長くなっている。内挿部材４３をその軸線方向に貫通する貫通穴部４３ａの内部には、一端がニードル４０の頭部４０ａに接続されると共に他端が燃料経路部材４１の下端部に接続されたスプリング４４が設けられている。小径部３３ｂの外周面には、スプリング４４に対応する位置に、円筒形状の電磁石４５が設けられている。ここで、連通孔３５と、貫通穴部４２と、貫通穴部４３ａと、内部空間３３ｃと、経路４０ｄと、隙間２３とは、燃料通路を構成する。このような構成により、ニードル４０は、後述する動作に従って、貫通穴部１２ａ内を上下方向に摺動するようになっている。 In the internal space 33c of the upper casing 33, a cylindrical fuel passage member 41 is provided in contact with the lower surface of the upper end portion 33b1. A through hole 42 is provided in the fuel passage member 41 so as to penetrate the fuel passage member 41 in the axial direction, and the through hole 42 is located coaxially with the communication hole 35. Further, a cylindrical metal insertion member 43 is provided in the inner space 33 c so as to surround the outer periphery of the fuel path member 41. The axial length of the insertion member 43 is longer than the axial length of the fuel passage member 41. A spring 44 having one end connected to the head 40a of the needle 40 and the other end connected to the lower end of the fuel path member 41 is provided inside the through hole 43a that penetrates the insertion member 43 in its axial direction. It is provided. A cylindrical electromagnet 45 is provided on the outer peripheral surface of the small diameter portion 33 b at a position corresponding to the spring 44. Here, the communication hole 35, the through hole 42, the through hole 43a, the internal space 33c, the path 40d, and the gap 23 constitute a fuel passage. With such a configuration, the needle 40 slides up and down in the through hole 12a according to the operation described later.
　図４に示されるように、ニードル４０の弁体部４０ｂの下端部分には、円形の下部端面４０ｂ１と、ノズル部３２ｂの傾斜側面部３２ｂ４の内周面３２ｂ５と同じ傾斜角を有すると共に下部端面４０ｂ１の周囲に沿って形成された傾斜面４０ｂ２とが設けられている。ニードル４０が下方に摺動して傾斜面４０ｂ２と内周面３２ｂ５とが重なり合うように接触すると、噴孔９は、傾斜面４０ｂ２によって直接塞がれ、噴孔９と燃料通路とが遮断されるようになっている。 As shown in FIG. 4, the lower end portion of the valve body portion 40b of the needle 40 has a circular lower end surface 40b1 and the same inclination angle as the inner peripheral surface 32b5 of the inclined side surface portion 32b4 of the nozzle portion 32b An inclined surface 40b2 is provided along the periphery of 40b1. When the needle 40 slides downward and contacts the inclined surface 40b2 and the inner circumferential surface 32b5 so as to overlap, the injection hole 9 is directly closed by the inclined surface 40b2, and the injection hole 9 and the fuel passage are blocked. It is supposed to be.
　次に、この実施の形態２に係る燃料噴射装置の動作を、図３及び４に基づいて説明する。
　燃料は、ポンプ３８によって、配管３６と、連通孔３５と、貫通穴部４２と、貫通穴部４３ａとを順次流通し、内挿部材４３とニードル４０の頭部４０ａとの間及び経路４０ｄを通り抜けて、上部ケーシング３の内部空間３３ｃに燃料が充填される。内部空間３３ｃに供給された燃料は、隙間２３を介して、隙間２１に流入することにより、本体部３４の内部が燃料で充填される。 Next, the operation of the fuel injection device according to the second embodiment will be described based on FIGS. 3 and 4.
The fuel flows through the piping 36, the communication hole 35, the through hole 42, and the through hole 43a sequentially by the pump 38, and between the insertion member 43 and the head 40a of the needle 40 and the path 40d After passing through, the internal space 33 c of the upper casing 3 is filled with fuel. The fuel supplied to the internal space 33 c flows into the gap 21 through the gap 23, whereby the inside of the main body 34 is filled with the fuel.
　電磁石４５に電流が通電されていない場合、スプリング４４は、その弾性力によって、ニードル４０の頭部４０ａを下方に押している状態となる。すると、ニードル４０は下方に押し下げられるので、ニードル４０の弁体部４０ｂの傾斜面４０ｂ２によって噴孔９が塞がれ、本体部３４内の燃料は、噴孔９からは流出しない状態となっている。尚、本体部３４内の燃料は、ポンプ３８により圧送されているので、加圧された状態となっている。 When the electromagnet 45 is not energized, the spring 44 pushes the head 40 a of the needle 40 downward by its elastic force. Then, since the needle 40 is pushed downward, the injection hole 9 is blocked by the inclined surface 40b2 of the valve body 40b of the needle 40, and the fuel in the main body 34 does not flow out from the injection hole 9 There is. The fuel in the main body portion 34 is pressurized by the pump 38 and thus is in a pressurized state.
　噴孔９から燃料を噴射させるには、電磁石４５に電流を通電させる。すると、電磁石４５の磁力がスプリング４４の弾性力に打ち勝って、ニードル４０を電磁石４５の内部に位置するように吸引する。これにより、ニードル４０は上方に押し上げられるので、傾斜面４０ｂ２によって塞がれていた噴孔９が開口する。本体部３４内に充填されている燃料はポンプ３８によって加圧された状態なので、その圧力により、噴孔９から燃料が噴射される。 In order to inject the fuel from the injection hole 9, the electromagnet 45 is energized. Then, the magnetic force of the electromagnet 45 overcomes the elastic force of the spring 44 and attracts the needle 40 so as to be located inside the electromagnet 45. As a result, the needle 40 is pushed upward, so that the injection hole 9 blocked by the inclined surface 40b2 is opened. The fuel filled in the main body portion 34 is in a state of being pressurized by the pump 38, so the fuel is injected from the injection hole 9 by the pressure.
　実施の形態１と同様に、圧電素子１４に共振周波数の振動電流が通電されることにより、ホーン１２は共振するので、燃料噴射装置３０においても、実施の形態１と同様の効果を得ることができる。 As in the first embodiment, since the horn 12 resonates when the oscillating current of the resonance frequency is supplied to the piezoelectric element 14, the same effect as in the first embodiment can be obtained in the fuel injection device 30. it can.
実施の形態３．
　次に、この発明の実施の形態３に係る燃料噴射装置について説明する。この発明の実施の形態３に係る燃料噴射装置は、実施の形態１に対して、円筒状のニードルがホーンを内部に含むような構成、すなわち、ホーンがニードルの径方向内側に配置されるようにしたものである。 Third Embodiment
Next, a fuel injection device according to Embodiment 3 of the present invention will be described. The fuel injection device according to the third embodiment of the present invention has a configuration in which the cylindrical needle includes the horn in the inside with respect to the first embodiment, that is, the horn is disposed radially inward of the needle The
　図５に示されるように、燃料噴射装置５０は、下部ケーシング５２と上部ケーシング５３とからなる本体部５４を備えている。下部ケーシング５２は、上部が開口すると共に上部の開口の直径よりも小さな直径を有する円形の穴５２ａ１が下部に形成された円筒形状の固定部５２ａと、固定部５２ａの外径よりも小さな外径を有する円筒形状のノズル部５２ｂとから構成されている。ノズル部５２ｂの上部には、円筒形状の挿入部材５２ｂ１と、挿入部材５２ｂ１の上に配置された挿入部材５２ｂ２とが設けられており、ノズル部５２ｂが固定部５２ａの内部から穴５２ａ１に挿入されると共に挿入部材５２ｂ１が固定部５２ａの内部底面５２ａ２に当接するようにして、下部ケーシング５２が構成されている。固定部５２ａの上部の開口付近の内周面には、図示しない雌ねじ部が形成されている。ノズル部５２ｂの下端部は、先細り形状を有すると共に円形の下部端面５２ｂ２で閉じている。円筒形状の円筒側面部５２ｂ３の下端部と下部端面５２ｂ２とは、異なる角度の傾斜を有する第１傾斜側面部５２ｂ４及び第２傾斜側面部５２ｂ５を介して接続されており、第２傾斜側面部５２ｂ５には、第２傾斜側面部５２ｂ５を貫通する噴孔９が設けられている。ノズル部５２ｂの内部の下端には、噴孔９と連通するように、燃料が貯留される貯留室６０が設けられている。 As shown in FIG. 5, the fuel injection device 50 includes a main body 54 including a lower casing 52 and an upper casing 53. The lower casing 52 has a cylindrical fixed portion 52a having an open upper portion and a circular hole 52a1 at the lower portion having a diameter smaller than the diameter of the upper opening, and an outer diameter smaller than the outer diameter of the fixed portion 52a. And a cylindrical nozzle portion 52b. A cylindrical insertion member 52b1 and an insertion member 52b2 disposed on the insertion member 52b1 are provided in the upper portion of the nozzle 52b, and the nozzle 52b is inserted into the hole 52a1 from the inside of the fixing portion 52a. The lower casing 52 is configured such that the insertion member 52b1 abuts on the inner bottom surface 52a2 of the fixed portion 52a. An internal thread portion (not shown) is formed on the inner peripheral surface near the opening of the upper portion of the fixing portion 52a. The lower end portion of the nozzle portion 52b has a tapered shape and is closed by a circular lower end surface 52b2. The lower end portion and the lower end surface 52b2 of the cylindrical side surface 52b3 are connected via the first inclined side surface 52b4 and the second inclined side surface 52b5 having different angles of inclination, and the second inclined side surface 52b5 is formed. The injection hole 9 which penetrates the 2nd inclination side part 52b5 is provided in this. A storage chamber 60 in which the fuel is stored is provided at the lower end inside the nozzle portion 52 b so as to communicate with the injection hole 9.
　下部ケーシング５２の内部には、ボルト締めランジュバン５１が設けられている。ボルト締めランジュバン５１は、下部ケーシング５２内の挿入部材５２ｂ２からノズル部５２ｂの内部の下端部に向かって延びるように設けられたホーン６２を備えている。ホーン６２は、ノズル部５２ｂの貫通穴部５５内を延びる棒状の第１振動本体６２ａと、第１振動本体部６２ａの上端に設けられると共に貫通穴部５５内を延び、かつ、第１振動本体６２ａの外径よりも大きな外径を有する第２振動本体６２ｂと、第２振動本体６２ｂの上端に設けられると共に円錐台形状部分を有する頭部６２ｃと、頭部６２ｃの上部に設けられた円盤形状のフランジ部６２ｄとを備えている。フランジ部６２ｄの下面は、挿入部材５２ｂ２の上面に当接している。 Inside the lower casing 52, a bolted Lange van 51 is provided. The bolted Lange van 51 includes a horn 62 provided so as to extend from the insertion member 52 b 2 in the lower casing 52 toward the lower end portion inside the nozzle portion 52 b. The horn 62 is provided at the upper end of the first vibrating main body 62a in a rod shape extending in the through hole 55 of the nozzle 52b, and at the upper end of the first vibrating main body 62a and extends in the through hole 55, and the first vibrating main body A second vibrating body 62b having an outer diameter larger than the outer diameter of 62a, a head 62c provided at the upper end of the second vibrating body 62b and having a frusto-conical portion, and a disk provided at the top of the head 62c And a flange portion 62d of a shape. The lower surface of the flange portion 62d is in contact with the upper surface of the insertion member 52b2.
　また、ボルト締めランジュバン５１は、ボルト６３によってフランジ部６２ｄに対して固定された複数枚の円環状の圧電素子６４を備えている。ここで、ホーン６２におけるフランジ部６２ｄの位置については、実施の形態１と同様に、圧電素子６４によるホーン６２の振動の節に相当する位置であり、この位置は、当業者に周知の技術である固有値解析により求めることができる。また、ホーン６２の長さについても、実施の形態１と同様である。 Further, the bolt-clamped Lange van 51 includes a plurality of annular piezoelectric elements 64 fixed to the flange portion 62 d by bolts 63. Here, the position of the flange portion 62 d in the horn 62 is a position corresponding to a node of vibration of the horn 62 by the piezoelectric element 64 as in the first embodiment, and this position is determined by a technique known to those skilled in the art. It can be determined by a certain eigenvalue analysis. The length of the horn 62 is also the same as that of the first embodiment.
　ノズル部５２ｂの内部には、弁部材である略円筒形状のニードル７０が設けられている。ニードル７０は、上方部分の摺動固定部７０ａと、下方部分の弁体部７０ｂとから構成され、その軸方向に貫通する貫通穴部７０ｃを内部に有している。摺動固定部７０ａは、ノズル部５２ｂの貫通穴部５５の円形断面の直径と同じ大きさの外径を有する円筒形状を有しており、ニードル７０を貫通穴部５５内に摺動可能に固定するようになっている。弁体部７０ｂは、摺動固定部７０ａの外径よりも小さな外径を有する円筒形状を有しており、弁体部７０ｂとノズル部５２ｂの内周面との間には、隙間８１が形成されている。 A substantially cylindrical needle 70, which is a valve member, is provided inside the nozzle portion 52b. The needle 70 is composed of a sliding fixing portion 70a in the upper part and a valve body 70b in the lower part, and has a through hole 70c penetrating in the axial direction inside. The slide fixing portion 70 a has a cylindrical shape having an outer diameter of the same size as the diameter of the circular cross section of the through hole 55 of the nozzle 52 b, and can slide the needle 70 into the through hole 55. It is supposed to be fixed. The valve body portion 70b has a cylindrical shape having an outer diameter smaller than the outer diameter of the slide fixing portion 70a, and a gap 81 is formed between the valve body portion 70b and the inner peripheral surface of the nozzle portion 52b. It is formed.
　ホーン６２の第２振動本体６２ｂは、ニードル７０の貫通穴部７０ｃの円形断面の直径と同じ大きさの外径を有しているため、ニードル７０は、第２振動本体６２ｂに沿って摺動可能となるように、第２振動本体６２ｂに固定されている。ホーン６２の第１振動本体６２ａは第２振動本体６２ｂの外径よりも小さな外径を有しているので、第１振動本体６２ａと弁体部７０ｂの内周面との間に、隙間８２が形成されている。すなわち、ニードル７０は、貫通穴部７０ｃの内部にホーン６２の第１振動本体６２ａ及び第２振動本体６２ｂを含むようにして設けられ、後述する機構により、第１振動本体６２ａ及び第２振動本体６２ｂに沿って上下に摺動可能である。 The second vibrating body 62b of the horn 62 has an outer diameter of the same size as the diameter of the circular cross section of the through hole 70c of the needle 70, so the needle 70 slides along the second vibrating body 62b. It is being fixed to the 2nd vibration main body 62b so that it may become possible. Since the first vibrating body 62a of the horn 62 has an outer diameter smaller than the outer diameter of the second vibrating body 62b, a gap 82 is formed between the first vibrating body 62a and the inner peripheral surface of the valve body 70b. Is formed. That is, the needle 70 is provided to include the first vibrating main body 62a and the second vibrating main body 62b of the horn 62 inside the through hole 70c, and the first vibrating main body 62a and the second vibrating main body 62b are It can slide up and down along it.
　ノズル部５２ｂの貫通穴部５５において、ニードル７０の摺動固定部７０ａよりも上方の領域では、挿入部材５２ｂ１の内周面と第２振動本体６２ｂとの間、及び挿入部材５２ｂ２の内周面と頭部６２ｃとの間に隙間が形成されており、この隙間が圧力室５６を構成する。圧力室５６の上部は、フランジ部６２ｄにより塞がれている。また、摺動固定部７０ａにより、圧力室５６と隙間８１とが隔離され、第２振動本体６２ｂにより、圧力室５６と隙間８２とが隔離されている。圧力室５６には、摺動固定部７０ａの上端面に下向き（貯留室６０の方向）の弾性力を与えるスプリング５７が設けられている。 In the through hole portion 55 of the nozzle portion 52b, in the region above the slide fixing portion 70a of the needle 70, between the inner peripheral surface of the insertion member 52b1 and the second vibrating main body 62b, and the inner peripheral surface of the insertion member 52b2 A gap is formed between the and the head 62c, and this gap constitutes a pressure chamber 56. The upper portion of the pressure chamber 56 is closed by the flange portion 62d. Further, the pressure chamber 56 and the gap 81 are separated by the sliding fixing portion 70a, and the pressure chamber 56 and the gap 82 are separated by the second vibrating main body 62b. The pressure chamber 56 is provided with a spring 57 that applies an elastic force downward (in the direction of the storage chamber 60) to the upper end surface of the slide fixing portion 70a.
　上部ケーシング５３は、円柱形状の上部本体５３ａと、上部本体５３ａの下端に設けられ上部本体５３ａの外径と同じ外径を有する円柱形状の中間本体５３ｃと、中間本体５３ｃの下端に設けられ中間本体５３ｃの外径と同じ外径を有する円筒形状の円筒部５３ｂとを備えている。上部本体５３ａの下方の外周面には、図示しない雄ねじ部が形成されている。円筒部５３ｂを下部ケーシング５２の固定部５２ａ内に挿入して円筒部５３ｂの内部にボルト６３及び圧電素子６４が収容されるようにして、上部本体５３ａの雄ねじ部と固定部５２ａの雌ねじ部とを螺合することにより、上部本体５３ａと固定部５２ａとが固定されて本体部５４が構成されている。また、円筒部５３ｂの下端がフランジ部６２ｄに当接している。これにより、フランジ部６２ｄが挿入部材５２ｂ２と円筒部５３ｂとに挟まれる構成となるので、フランジ部６２ｄは、本体部５４に対して固定されるようになる。 The upper casing 53 is provided with a cylindrical upper body 53a, a cylindrical intermediate body 53c provided at the lower end of the upper body 53a and having the same outer diameter as the outer diameter of the upper body 53a, and provided at the lower end of the intermediate body 53c And a cylindrical portion 53b having the same outer diameter as the outer diameter of the main body 53c. A male screw portion (not shown) is formed on the lower outer peripheral surface of the upper main body 53a. The cylindrical portion 53b is inserted into the fixed portion 52a of the lower casing 52 so that the bolt 63 and the piezoelectric element 64 are accommodated in the cylindrical portion 53b, and the male screw portion of the upper main body 53a and the female screw portion of the fixed portion 52a The upper main body 53a and the fixing portion 52a are fixed by screwing together, and the main body portion 54 is configured. Further, the lower end of the cylindrical portion 53b is in contact with the flange portion 62d. As a result, the flange portion 62 d is configured to be sandwiched between the insertion member 52 b 2 and the cylindrical portion 53 b, so the flange portion 62 d is fixed to the main body portion 54.
　上部ケーシング５３の上部本体５３ａ及び中間本体５３ｃの内部には、内部空間５８が設けられている。内部空間５８には、ピエゾアクチュエータ７１と、制御弁部７２と、スプリング７３とが設けられている。制御弁部７２は、円錐台形状部分及びその上に設けられた円柱形状部分を有する弁体部７２ａと、弁体部７２ａの下部に設けられ下方に向かって延びる棒状の伝達部材７２ｂとを有している。伝達部材７２ｂは、第１部材７２ｂ１と、第２部材７２ｂ２と、第３部材７２ｂ３とを有し、これらはそれぞれ外径の異なる円柱形状を有しており、第２部材７２ｂ２の外径が最も大きくなっている。内部空間５８は、第２部材７２ｂ２が位置する領域において、第２部材７２ｂ２の外径と同じ直径を有する円柱形状を有し、第２部材７２ｂ２は、それよりも下方の領域を第１空間５８ａとして、第２部材７２ｂ２よりも上方の領域から隔離している。スプリング７３は、第１空間５８ａ内に設けられている。制御弁部７２は、ピエゾアクチュエータ７１による下方の力と、スプリング７３による上方の弾性力との差に応じて、内部空間５８を上下に移動可能であり、弁体部７２ａの円錐台形状部分が、この円錐台形状部分と同じ傾斜角を有するようにして内部空間５８内に設けられた下方弁座部７４に当接すると、弁体部７２ａは、伝達部材７２ｂの第２部材７２ｂ２よりも上方かつ弁体部７２ａよりも下方の領域を第２空間５８ｂとして、下方弁座部７４よりも上方の領域から隔離するようになっている。また、ピエゾアクチュエータ７１の動作を停止すると、スプリング７３によって制御弁部７２が上方に移動し、弁体部７２ａの円柱形状部分が、内部空間５８内に設けられた上方弁座部７５に当接すると、弁体部７２ａは、下方弁座部７４よりも上方かつ上方弁座部７５よりも下方の領域を第３空間５８ｃとして、上方弁座部７５よりも上方の領域である第４空間５８ｄから隔離するようになっている。 An internal space 58 is provided inside the upper main body 53 a and the middle main body 53 c of the upper casing 53. In the internal space 58, a piezo actuator 71, a control valve portion 72, and a spring 73 are provided. The control valve portion 72 includes a valve body portion 72a having a truncated cone shape portion and a cylindrical shape portion provided thereon, and a rod-like transmission member 72b provided below the valve body portion 72a and extending downward. doing. The transmission member 72b has a first member 72b1, a second member 72b2 and a third member 72b3, which have cylindrical shapes with different outer diameters, and the outer diameter of the second member 72b2 is the largest. It is getting bigger. The internal space 58 has a cylindrical shape having the same diameter as the outer diameter of the second member 72b2 in the region where the second member 72b2 is located, and the second member 72b2 has a region below it as the first space 58a. As the second member 72b2, the second member 72b2 is separated from the upper region. The spring 73 is provided in the first space 58a. The control valve portion 72 can move up and down the internal space 58 according to the difference between the lower force of the piezoelectric actuator 71 and the elastic force of the upper portion of the spring 73, and the frustoconical portion of the valve body portion 72a is When the lower valve seat portion 74 provided in the internal space 58 is in contact with the lower valve seat portion 74 so as to have the same inclination angle as the truncated cone shaped portion, the valve body portion 72a is higher than the second member 72b2 of the transmission member 72b. And the area below the valve body 72a is separated from the area above the lower valve seat 74 as a second space 58b. Further, when the operation of the piezo actuator 71 is stopped, the control valve portion 72 is moved upward by the spring 73, and the cylindrical portion of the valve body portion 72a abuts on the upper valve seat portion 75 provided in the internal space 58. Then, the valve body portion 72a is a region above the lower valve seat portion 74 and a region below the upper valve seat portion 75 as a third space 58c, and a fourth space 58d above the upper valve seat portion 75. It is supposed to be isolated from
　圧力室５６と第３空間５８ｃとは、挿入部材５２ｂ１と、挿入部材５２ｂ２と、円筒部５３ｂと、中間本体５３ｃとの内部を延びる圧力バランス経路９１によって連通されている。第１空間５８ａと第４空間５８ｄとは、中間本体５３ｃ及び上部本体５３ａの内部を延びるバイパス経路９２によって連通されている。第４空間５８ｄは、燃料排出経路９３を介して、上部本体５３ａの外部と連通しており、燃料排出経路９３と接続された図示しない外部の配管を介して、第４空間５８ｃと、図示しない燃料タンクとが連通されている。 The pressure chamber 56 and the third space 58c are communicated with each other by a pressure balance path 91 extending inside the insertion member 52b1, the insertion member 52b2, the cylindrical portion 53b, and the intermediate main body 53c. The first space 58a and the fourth space 58d are communicated with each other by a bypass path 92 extending inside the middle main body 53c and the upper main body 53a. The fourth space 58d communicates with the outside of the upper main body 53a via the fuel discharge path 93, and is not shown with the fourth space 58c via an external pipe (not shown) connected to the fuel discharge path 93. It is in communication with the fuel tank.
　挿入部材５２ｂ１には、隙間８１と連通する燃料滞留室９５が形成されており、燃料滞留室９５には、挿入部材５２ｂ１と挿入部材５２ｂ２と円筒部５３ｂと上部本体５３ａとの内部を延びる燃料供給経路９４の一端が連通している。燃料供給経路９４の他端は、上部本体５３ａにおいて、上部本体５３ａの外部と連通しており、燃料供給経路９４の他端と接続された図示しない外部の配管を介して、燃料供給経路９４と図示しないコモンレールとが連通されている。ここで、燃料供給経路９４と、隙間８１とは、燃料通路を構成する。また、中間本体５３ｃの内部において、燃料供給経路９４は、分岐経路９６を介して、内部空間５８の第２空間５８ｂと連通している。 A fuel retention chamber 95 communicating with the gap 81 is formed in the insertion member 52b1, and the fuel retention chamber 95 is supplied with fuel that extends inside the insertion member 52b1, the insertion member 52b2, the cylindrical portion 53b, and the upper main body 53a. One end of the passage 94 is in communication. The other end of the fuel supply path 94 communicates with the outside of the upper main body 53 a in the upper main body 53 a, and is connected to the fuel supply path 94 via an external pipe (not shown) connected with the other end of the fuel supply path 94. It communicates with a common rail (not shown). Here, the fuel supply passage 94 and the gap 81 constitute a fuel passage. Further, inside the intermediate main body 53 c, the fuel supply path 94 is in communication with the second space 58 b of the internal space 58 via the branch path 96.
　図６に示されるように、ホーン６２の第１振動本体６２ａの下端には、第１振動本体６２ａの外径よりも小さな直径を有する円形の下部端面６２ａ１が形成されており、下部端面６２ａ１は、貯留室６０内に位置している。ニードル７０の弁体部７０ｂの下端部分には、ノズル部５２ｂの第１傾斜側面部５２ｂ４の内周面５２ｂ６と同じ傾斜角を有すると共に下端の周囲に沿って形成された傾斜面７０ｂ２が設けられている。ニードル７０が下方に摺動して傾斜面７０ｂ２と内周面５２ｂ６とが重なり合うように接触すると、ニードル７０の弁体部７０ｂによって、ノズル部５２ｂの内部は、貯留室６０及び隙間８２と、隙間８１とに隔離されるようになっている。すなわち、この状態では、噴孔９と燃料通路とが遮断された状態となっている。 As shown in FIG. 6, at the lower end of the first vibrating body 62a of the horn 62, a circular lower end surface 62a1 having a diameter smaller than the outer diameter of the first vibrating body 62a is formed, and the lower end surface 62a1 is , Located in the storage chamber 60. The lower end portion of the valve body portion 70b of the needle 70 is provided with an inclined surface 70b2 having the same inclination angle as the inner peripheral surface 52b6 of the first inclined side surface portion 52b4 of the nozzle portion 52b and formed along the periphery of the lower end. ing. When the needle 70 slides downward and contacts the inclined surface 70b2 and the inner circumferential surface 52b6 such that the inclined surface 70b2 and the inner circumferential surface 52b6 overlap, the valve chamber 70b of the needle 70 causes the interior of the nozzle 52b to form the reservoir 60 and the gap 82 It is supposed to be separated by 81 and so on. That is, in this state, the injection hole 9 and the fuel passage are shut off.
　次に、この実施の形態３に係る燃料噴射装置の動作を、図５及び６に基づいて説明する。
　図示しないコモンレール内の高圧の燃料を燃料噴射装置５０に供給する前には、ニードル７０は、スプリング５７の弾性力によって下方に押し下げられ、噴孔９と燃料通路とが遮断された状態となっている。また、ピエゾアクチュエータ７１を駆動させる前には、スプリング７３の弾性力によって制御弁部７２が上方に押し上げられて、弁体部７２ａが上方弁座部７５に当接し、第３空間５８ｃと第４空間５８ｄとが隔離された状態になっている。 Next, the operation of the fuel injection device according to the third embodiment will be described based on FIGS.
Before the high pressure fuel in the common rail (not shown) is supplied to the fuel injection device 50, the needle 70 is pushed downward by the elastic force of the spring 57, and the injection hole 9 and the fuel passage are disconnected. There is. In addition, before driving the piezo actuator 71, the control valve portion 72 is pushed upward by the elastic force of the spring 73, and the valve body portion 72a abuts on the upper valve seat portion 75, and the third space 58c and the fourth space 58c The space 58d is in a separated state.
　図示しないコモンレール内の燃料が、燃料供給経路９４内に供給されると、燃料は、燃料滞留室９５及び隙間８１内に充填される。また、燃料供給経路９４を流通する燃料の一部は、分岐経路９６を介して第２空間５８ｂに流入する。このとき、弁体部７２ａは上方弁座部７５に当接し、第２空間５８ｂと第３空間５８ｃとが連通しているので、第３空間５８ｃにも燃料が流入する。第３空間５８ｃに流入した燃料はさらに、圧力バランス経路９１を介して圧力室５６に流入する。ここで、圧力室５６内と燃料滞留室９５内とはともに、コモンレールからの高圧の燃料が充填されていることから同じ圧力であるため、ニードル７０は、スプリング５７の弾性力のみによって下方に押し下げられて噴孔９を閉じている。 When the fuel in the common rail (not shown) is supplied into the fuel supply path 94, the fuel is filled in the fuel retention chamber 95 and the gap 81. In addition, a part of the fuel flowing through the fuel supply passage 94 flows into the second space 58 b via the branch passage 96. At this time, the valve body portion 72a abuts on the upper valve seat portion 75, and the second space 58b and the third space 58c communicate with each other, so the fuel also flows into the third space 58c. The fuel flowing into the third space 58 c further flows into the pressure chamber 56 via the pressure balance path 91. Here, since both the inside of the pressure chamber 56 and the inside of the fuel retention chamber 95 have the same pressure because they are filled with high-pressure fuel from the common rail, the needle 70 is pushed downward only by the elastic force of the spring 57. And the injection hole 9 is closed.
　この状態でピエゾアクチュエータ７１が駆動して制御弁部７２を押し下げ、弁体部７２ａの円錐台形状部分が下方弁座部７４に当接して、第２空間５８ｂと第３空間５８ｃとを隔離すると、第３空間５８ｃが第４空間５８ｄと連通するようになるので、圧力室５６内の燃料が、圧力バランス経路９１、第３空間５８ｃ、第４空間５８ｄ、燃料排出経路９３を順次流通して、図示しない燃料タンクへ流出する。この結果、圧力室５６内の圧力は、燃料タンク内の圧力とほぼ等しくなる。燃料タンク内の圧力は、コモンレール内の燃料の圧力よりも低いので、圧力室５６と燃料滞留室９５との間で圧力差が生じる。この圧力差がスプリング５７の弾性力より大きくなることから、ニードル７０が上方に押し上げられて、噴孔９が開き、隙間８１内の燃料が、隙間８２及び貯留室６０に流入する。 In this state, the piezo actuator 71 is driven to push down the control valve portion 72, and the truncated cone shaped portion of the valve body portion 72a abuts on the lower valve seat portion 74 to separate the second space 58b from the third space 58c. Since the third space 58c communicates with the fourth space 58d, the fuel in the pressure chamber 56 flows in the pressure balance path 91, the third space 58c, the fourth space 58d, and the fuel discharge path 93 sequentially. Flows out to a fuel tank (not shown). As a result, the pressure in the pressure chamber 56 becomes approximately equal to the pressure in the fuel tank. Since the pressure in the fuel tank is lower than the pressure of the fuel in the common rail, a pressure difference is generated between the pressure chamber 56 and the fuel retention chamber 95. Since this pressure difference becomes larger than the elastic force of the spring 57, the needle 70 is pushed upward, the injection hole 9 is opened, and the fuel in the gap 81 flows into the gap 82 and the storage chamber 60.
　ピエゾアクチュエータ７１が駆動する際に、圧電素子６４に共振周波数の振動電流が通電されることにより、ホーン６２は共振する。ホーン６２の振動により、隙間８２内の高圧燃料が振動する。また、ホーン６２には、振動の節に相当する位置にフランジ部６２ｄが設けられ、フランジ部６２ｄが本体部５４に対して固定されていることにより、振動の腹に相当するホーン６２の先端が大きく振動するので、貯留室６０内に位置する下部端面６２ａ１が、貯留室６０内の高圧燃料にキャビテーションや流量変動を発生させ、噴孔９から噴射された燃料が微粒化する。燃料噴射装置５０においても、振動の腹に相当するホーン６２の先端が大きく振動するので、実施の形態１と同様の効果を得ることができる。 When the piezoelectric actuator 71 is driven, the horn 62 resonates by supplying the oscillating current of the resonance frequency to the piezoelectric element 64. Due to the vibration of the horn 62, the high pressure fuel in the gap 82 vibrates. Further, the horn 62 is provided with a flange 62d at a position corresponding to a node of vibration, and the flange 62d is fixed to the main body 54, so that the tip of the horn 62 corresponding to the antinode of vibration is Since the lower end face 62a1 located in the storage chamber 60 vibrates greatly, the high pressure fuel in the storage chamber 60 generates cavitation and flow rate fluctuation, and the fuel injected from the injection hole 9 is atomized. Also in the fuel injection device 50, the tip end of the horn 62 corresponding to the antinode of vibration vibrates largely, so that the same effect as that of the first embodiment can be obtained.
　実施の形態１～３では、圧電素子がボルトによってホーンに固定されたボルト締めランジュバンを使用しているが、これに限定するものではない。固定方法はどのようなものであってもよく、例えば、圧電素子が接着材等によりホーンに接着されたものであってもよい。 In the first to third embodiments, although the piezoelectric element is a bolted Lange van fixed to the horn by a bolt, the present invention is not limited to this. The fixing method may be any method, for example, the piezoelectric element may be bonded to the horn by an adhesive or the like.
　実施の形態１及び２では、ニードルの外周全体がホーンに囲まれ、実施の形態３では、ホーンの外周全体がニードルに囲まれているが、この形態に限定するものではない。実施の形態１及び２では、ニードルの外周の一部がホーンの径方向内側に配置される構成でもよく、実施の形態３では、ホーンの外周の一部がニードルの径方向内側に配置される構成でもよい。 In the first and second embodiments, the entire outer periphery of the needle is surrounded by the horn, and in the third embodiment, the entire outer periphery of the horn is surrounded by the needle. However, the present invention is not limited to this configuration. In the first and second embodiments, a portion of the outer periphery of the needle may be disposed radially inward of the horn, and in the third embodiment, a portion of the outer periphery of the horn may be disposed radially inward of the needle It may be a configuration.
　１，３０，５０　燃料噴射装置、３ａ　（上部ケーシング３の）内部空間、４，３４，５４　本体部、５，３５　連通孔（燃料通路）、９　噴孔、１４，６４　圧電素子（振動子）、１２，６２　ホーン、１３，６２ｄ　フランジ部、２０，４０，７０　ニードル（弁部材）、２１，２３，８１　隙間（燃料通路）、２２　経路（燃料通路）、３３ｃ　（上部ケーシング３３の）内部空間、４２，４３ａ　貫通穴部、９４　燃料供給経路（燃料通路）。 1, 30, 50 fuel injection device, 3a (in the upper casing 3) internal space, 4, 34, 54 main body, 5, 35 communication hole (fuel passage), 9 injection hole, 14, 64 piezoelectric element (vibrator) , 12, 62 horn, 13, 62 d flange portion, 20, 40, 70 needle (valve member), 21, 23, 81 gap (fuel passage), 22 passage (fuel passage), 33c (in upper casing 33) internal space , 42, 43a Through hole, 94 Fuel supply passage (fuel passage).

Claims (6)

  1. 　燃料が噴射される噴孔及び該噴孔に連通する燃料通路が設けられた本体部と、
    　該本体部の内部に設けられ、前記噴孔と前記燃料通路とを連通または遮断する弁部材と、
    　前記燃料通路に設けられたホーンと、
    　前記ホーンを振動させる振動子と
    を備え、
    　該ホーンには、前記本体部に対して固定されるフランジ部が形成され、
    　該フランジ部は、前記ホーンの振動の節に相当する位置に設けられる燃料噴射装置。     An injection hole through which fuel is injected, and a main body provided with a fuel passage communicating with the injection hole;
    A valve member provided inside the main body, for communicating or blocking the injection hole and the fuel passage;
    A horn provided in the fuel passage,
    And a vibrator for vibrating the horn,
    The horn is formed with a flange portion fixed to the main body portion,
    The fuel injector according to claim 1, wherein the flange portion is provided at a position corresponding to a node of vibration of the horn.
  2. 　前記弁部材は、前記ホーンに沿って摺動可能である、請求項１に記載の燃料噴射装置。 The fuel injection device according to claim 1, wherein the valve member is slidable along the horn.
  3. 　前記ホーンの少なくとも一部は、前記弁部材の径方向内側に配置されている、請求項２に記載の燃料噴射装置。 The fuel injection device according to claim 2, wherein at least a part of the horn is disposed radially inward of the valve member.
  4. 　前記本体部の内部には、前記噴孔に連通すると共に燃料を貯留する貯留室が設けられ、前記ホーンの先端が前記貯留室内に位置する、請求項３に記載の燃料噴射装置。 The fuel injection device according to claim 3, wherein a storage chamber communicating with the injection hole and storing fuel is provided in the inside of the main body portion, and a tip end of the horn is positioned in the storage chamber.
  5. 　前記弁部材の少なくとも一部は、前記ホーンの径方向内側に配置されている、請求項３に記載の燃料噴射装置。 The fuel injection device according to claim 3, wherein at least a part of the valve member is disposed radially inward of the horn.
  6. 　前記ホーン及び前記振動子は、ボルト締めランジュバンである、請求項１～５のいずれか一項に記載の燃料噴射装置。 The fuel injection device according to any one of claims 1 to 5, wherein the horn and the vibrator are bolted Langevin.
PCT/JP2010/054854 2009-08-25 2010-03-19 Fuel injection device WO2011024500A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298657A (en) * 1986-06-16 1987-12-25 Diesel Kiki Co Ltd Fuel injection valve
JPH0486367A (en) * 1990-07-30 1992-03-18 Aisin Seiki Co Ltd Fuel injection valve
JPH0968133A (en) * 1995-08-31 1997-03-11 Denso Corp Fuel injection device
WO2008059389A1 (en) * 2006-09-08 2008-05-22 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid delivery device
JP2009041508A (en) * 2007-08-10 2009-02-26 Denso Corp Fuel injection nozzle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298657A (en) * 1986-06-16 1987-12-25 Diesel Kiki Co Ltd Fuel injection valve
JPH0486367A (en) * 1990-07-30 1992-03-18 Aisin Seiki Co Ltd Fuel injection valve
JPH0968133A (en) * 1995-08-31 1997-03-11 Denso Corp Fuel injection device
WO2008059389A1 (en) * 2006-09-08 2008-05-22 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid delivery device
JP2009041508A (en) * 2007-08-10 2009-02-26 Denso Corp Fuel injection nozzle

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