WO2014175112A1 - 燃料噴射弁 - Google Patents

燃料噴射弁 Download PDF

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Publication number
WO2014175112A1
WO2014175112A1 PCT/JP2014/060671 JP2014060671W WO2014175112A1 WO 2014175112 A1 WO2014175112 A1 WO 2014175112A1 JP 2014060671 W JP2014060671 W JP 2014060671W WO 2014175112 A1 WO2014175112 A1 WO 2014175112A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
fuel injection
orifice plate
nozzle body
injection valve
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2014/060671
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
一樹 吉村
岡本　良雄
石井　英二
前川　典幸
貴博 齋藤
敦士 中井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to IN1033DEN2015 priority Critical patent/IN2015DN01033A/en
Priority to CN201480002181.XA priority patent/CN104603444A/zh
Publication of WO2014175112A1 publication Critical patent/WO2014175112A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices

Definitions

  • the present invention relates to a fuel injection valve used in an internal combustion engine, and relates to a fuel injection valve capable of improving atomization performance by injecting swirling fuel.
  • Patent Document 1 A fuel injection valve described in Patent Document 1 is known as a prior art that promotes atomization of fuel injected from a plurality of fuel injection holes using a swirl flow.
  • valve seat body nozzle body having an immobile valve seat, a valve closing body, and a holed disk (orifice plate) disposed downstream of the valve seat body.
  • the perforated disc has at least one inflow region and at least one outflow opening.
  • each functional plane has a different opening geometry, the lower end surface of the valve seat body covers at least one inflow region of the perforated disc, and at least two outflow openings are covered by the valve seat body.
  • the fuel flows into the swirl chamber where the fuel is twisted (swirled) with a non-uniform velocity portion, resulting in a swirl flow having a non-uniform velocity distribution in the swirl chamber, which adversely affects the atomization of the fuel.
  • a fuel injection valve includes a swirl chamber having an inner peripheral wall formed so that a curvature gradually increases from an upstream side to a downstream side in an orifice plate, and a fuel in the swirl chamber.
  • a fuel passage is formed by the turning passage of the orifice plate and the opening of the nozzle body in contact with the upper surface of the orifice plate.
  • the flow path structure for allowing the fuel to flow from the upper part of the side surface of the turning passage onto the periphery of the opening (fuel introduction hole) provided on the lower surface of the nozzle body in contact with the upper surface of the orifice plate Is provided.
  • the flow structure provided at the edge of the fuel introduction hole allows the fuel to flow into the upper part of the turning passage, thereby reducing the uneven speed distribution of the turning passage and improving the turning force. It is possible to improve the atomization of the fuel.
  • FIG. 5 is a BB cross-sectional view of the turning passage of FIG. 4. It is a figure for demonstrating the detail of the nozzle body shape which provided the orifice plate and the flow-path structure which concerns on one Example of this invention.
  • FIG. 1 is a longitudinal sectional view showing the overall configuration of a fuel injection valve 1 according to the present invention.
  • a fuel injection valve 1 has a structure in which a nozzle body 2 and a valve body 6 are accommodated in a thin stainless steel pipe 13 and the valve body 6 is reciprocated (open / closed) by an electromagnetic coil 11 disposed outside. is there. Details of the structure will be described below.
  • a fuel injection chamber 4 (see FIG. 2) that allows passage of fuel flowing through the valve seat surface 3, a gap between the valve body 6 and the valve seat surface 3, and a plurality of fuel injection holes downstream of the fuel injection chamber 4
  • an orifice plate 20 having 23a, 23b, 23c, and 23d (see FIG. 3).
  • four fuel injection holes are described as an example, but the number of holes is not limited to four.
  • a spring 8 as an elastic member for pressing the valve body 6 against the valve seat surface 3 is provided at the center of the core 7.
  • the elastic force of the spring 8 is adjusted by the pushing amount of the spring adjuster 9 in the direction of the valve seat surface 3.
  • the fuel injection valve 1 is provided with a fuel passage 12 having a filter 14 at the inlet.
  • the fuel passage 12 includes a through-hole portion that penetrates the center of the core 7 and is pressurized by a fuel pump (not shown). This is a passage that guides the fuel to the fuel injection holes 23a, 23b, 23c, and 23d through the inside of the fuel injection valve 1.
  • the outer portion of the fuel injection valve 1 is covered with a resin mold 15 and electrically insulated.
  • the operation of the fuel injection valve 1 controls the amount of fuel supplied by switching the position of the valve body 6 between the valve open state and the valve closed state in accordance with energization (injection pulse) to the coil 11. is doing.
  • valve body design is designed so that there is no fuel leakage, especially when the valve is closed.
  • This type of fuel injection valve uses a ball (steel ball for ball bearing of JIS standard product) having a high roundness and a mirror finish on the valve body 6, which is beneficial for improving the sheet property.
  • valve seat angle of the valve seat surface 3 with which the ball is in close contact is an optimum angle of 80 ° to 100 ° with good grindability and high roundness, and the sheet property with the above-mentioned ball is extremely high. It can be maintained.
  • the nozzle body 2 having the valve seat surface 3 has increased hardness by quenching, and unnecessary magnetism has been removed by demagnetization treatment.
  • valve body 6 Such a configuration of the valve body 6 enables injection amount control without fuel leakage. Therefore, the valve body structure is excellent in cost performance.
  • FIG. 2 is a longitudinal sectional view showing the vicinity of the nozzle body 2 in the fuel injection valve 1 according to the present invention.
  • the upper surface 20 a of the orifice plate 20 is in contact with the lower surface 2 a of the nozzle body 2, and the outer periphery of this contact portion is fixed to the nozzle body 2 by laser welding.
  • the vertical direction is based on FIG. 1, and the fuel passage 12 side is the upper side in the valve axial direction of the fuel injection valve 1, and the fuel injection holes 23a, 23b, 23c, 23d ( The side is referred to as the lower side.
  • a fuel introduction hole 5 having a diameter smaller than the diameter ⁇ S of the seat portion 3 a of the valve seat surface 3 is provided at the lower end portion of the nozzle body 2.
  • the valve seat surface 3 has a conical shape, and a fuel introduction hole 5 is formed at the center of the downstream end thereof.
  • the valve seat surface 3 and the fuel introduction hole 5 are formed so that the center line o of the valve seat surface 3 and the center line o of the fuel introduction hole 5 coincide with the valve axis o.
  • the fuel introduction hole 5 and the turning passage 21a provided in the orifice plate 20 constitute a fuel flow path to the turning chamber 22a and the fuel injection hole 23a.
  • FIG. 3 is a plan view of the orifice plate 20 located at the lower end of the nozzle body 2 in the fuel injection valve 1 according to the present invention.
  • the orifice plate 20 is provided with four turning passages 21a, 21b, 21c, 21d at intervals of 90 °.
  • the downstream ends of the turning passages 21a, 21b, 21c, and 21d are connected to communicate with the turning chambers 22a, 22b, 22c, and 22d, respectively.
  • the turning passages 21a, 21b, 21c, and 21d are fuel passages that supply fuel to the turning chambers 22a, 22b, 22c, and 22d, respectively. In this sense, the turning passages 21a, 21b, 21c, and 21d are turned into the turning fuel supply passage 21a. , 21b, 21c, 21d.
  • the wall surfaces of the swirl chambers 22a, 22b, 22c, and 22d are formed so that the curvature gradually increases from the upstream side toward the downstream side (so that the radius of curvature gradually decreases).
  • the connecting portions of the turning passages 21a, 21b, 21c, and 21d and the turning chambers 22a, 22b, 22c, and 22d form thickness forming portions 25a, 25b, 25c, and 25d in consideration of the collision of the fuel flow.
  • fuel injection holes 23a, 23b, 23c, and 23d are opened at the centers of the swirl chambers 22a, 22b, 22c, and 22d, respectively.
  • nozzle body 2 and the orifice plate 20 are not shown in the drawing, they are configured to be easily and easily positioned using a jig or the like, and the dimensional accuracy at the time of combination is enhanced.
  • the orifice plate 20 is manufactured by cutting or press forming (plastic processing).
  • a method with high processing accuracy that is relatively free of stress such as electric discharge machining, electroforming, and etching may be considered.
  • FIG. 4 is an enlarged cross-sectional view of the orifice plate 20 and the conventional nozzle body 2 '.
  • the figure includes a valve body 6, a nozzle body 2 ′, an orifice plate 20, and a fuel flow F.
  • FIG. 5 is a BB cross section of FIG.
  • the fuel F flows into the fuel injection chamber 4 from the gap between the valve body 6 and the nozzle body 2 ′, and enters the orifice plate which is the connection between the opening of the nozzle body 2 ′ and the turning passage 21a.
  • the flow is directed from the upper side of the orifice plate inflow portion 2b 'toward the bottom surface of the turning passage 21a, and the pressure is increased in the vicinity of the bottom surface. Therefore, the flow velocity in the vicinity of the upper surface 51 is lower than that of the lower surface of the turning passage 21a, and the cross section of the turning passage 21a has a non-uniform velocity distribution. Since the flow with the non-uniform velocity distribution flows into the swirl chamber 22a as it is, the swirl flow has a non-uniform velocity distribution within the swirl chamber 22a, and as a result, the swirl force is reduced.
  • FIG. 6 is an enlarged cross-sectional view for explaining the relationship between the orifice plate 20 and the flow path structure 31 provided at the edge of the fuel introduction hole 5 serving as the opening of the nozzle body 2 according to the present invention.
  • the figure includes a valve body 6, a nozzle body 2, an orifice plate 20, and a fuel flow F.
  • FIG. 7 is a B′-B ′ cross section of FIG. 6 and includes a flow path structure 31 and a fuel flow F.
  • FIG. 8 is a cross-sectional view taken along the line CC of FIG. 6 and is composed of a flow path structure 31 and an orifice plate 20 viewed from the fuel introduction hole 5 which is an opening of the nozzle body 2.
  • a flow path structure 31 is provided along the edge of the fuel introduction hole 5 so that fuel flows from the upper part of the side surface of the turning passage 21a. As a result, as shown in FIG. 7, the flow path structure 31 becomes a flow path communicating with the turning passage 21a.
  • the fuel flow generated by the present invention will be described.
  • the fuel F flows from the fuel injection chamber 4 to the fuel inflow portion 2 b to the orifice plate, but as shown in FIGS. 7 and 8, the upper side surface of the turning passage 21 a is passed through the flow path structure 31.
  • the fuel F flows into the turning passage 21 a along the fuel introduction hole 5. Therefore, as shown in FIG. 6, the low-speed portion near the upper surface 51 of the turning passage 21a, which has occurred in the conventional structure (FIG. 4), is alleviated, and the non-uniform velocity distribution can be improved as a whole section. Further, as indicated by an arrow F in FIGS. 7 and 8, it can be seen that the side surface fuel flow F flows from the upper side surface of the turning passage 21a by the flow path structure 31.
  • the flow path structure 31 described above is processing for the nozzle body 2, it can be applied regardless of the shape of the flow path processed in the orifice plate 20.
  • the shape of the swirling passage, swirl chamber, and fuel injection hole differs depending on the target flow rate, spray angle, and particle size, but the structure of the present invention has the effect of equalizing the velocity distribution in the swirling passage regardless of these shapes. Can be obtained.
  • the effect of improving the nonuniform velocity distribution in the turning passage is obtained. Obtainable.
  • the method described in this embodiment can be achieved by providing a recess in the orifice plate instead of the nozzle body.
  • the recess provided in the orifice plate, the turning passage, and the nozzle body opening high processing accuracy is achieved.
  • high precision positioning and assembly is required.
  • deformation of the orifice plate when welding the orifice plate and the nozzle body affects the shape of the recess, resulting in processing variations. Therefore, the structure in which the nozzle body (the edge of the fuel introduction hole) is provided with a flow path communicating with the turning passage is the easiest, and mass production at low cost is possible.
  • FIG. 10 shows a CC cross section of FIG. Except for the flow path structures 32a, 32b, 32c, and 32d provided at the edge of the fuel introduction hole 5 serving as the opening of the nozzle body 2, the description is omitted because it is the same as the first embodiment.
  • FIG. 10 shows the flow path structures 32a, 32b, 32c, 32d and the orifice plate 20 as seen from the fuel introduction hole 5 as in FIG.
  • the figure shows the orifice plate 20, the turning passage 21 a provided in the orifice plate 20, the turning chamber 22 a, the fuel injection hole 23 a, the fuel introduction hole 5, and the flow path structures 32 a, 32 b, 32 c provided in the fuel introduction hole 5. , 32d.
  • the flow path structures 32a, 32b, 32c, and 32d in FIG. 10 are provided corresponding to the respective turning passages 21a, 21b, 21c, and 21d.
  • a flow path structure 32a is provided for the turning passage 21a.
  • the flow path structure 32 a is provided longer along the edge of the fuel introduction hole 5 than the lateral width of the turning passage 21 a in order to induce a flow along the fuel introduction hole 5.
  • 11 and 12 are enlarged views of the flow path structures 33 and 34 provided at the edge of the fuel introduction hole 5 serving as the opening of the nozzle body 2.
  • Other than the channel structures 33 and 34 are the same as those in the first embodiment, and thus description thereof is omitted.
  • FIG. 11 includes a valve body 6, a nozzle body 2 having a flow path structure 33, and an orifice plate 20.
  • the flow path structure 33 shown in FIG. 11 has a cross-sectional shape that has a trapezoidal cross section.
  • the fuel can flow into the upper region of the turning passage 21a from the entire cross section of the flow path structure 33 at a high speed. From the above, it is possible to further uniform the speed distribution of the turning passage 21a.
  • FIG. 12 includes a valve body 6, a nozzle body 2 having a flow path structure 34, and an orifice plate 20.
  • the flow channel structure 34 has a shape in which the cross-section is substantially a quarter of a circle.
  • the flow path structure 34 sandwiched between the nozzle body lower surface 2a and the orifice plate upper surface 20a has a smaller area than the flow path structure 31 of the first embodiment, so that friction loss can be reduced and sufficient fuel flow can be achieved.
  • Speed can be secured. From the above, it is possible to further uniform the speed distribution of the turning passage 21a.
  • Other shapes that can be easily processed with respect to the nozzle body 2 include a structure in which the channel cross-sectional shape is rectangular as in FIG.
  • the speed distribution of the turning passage section can be made uniform.
  • Example 1 As a further example based on Example 1, Example 2, and Example 3, a fourth example will be described.
  • An example in which an inclined fuel injection hole 23as is provided to change the spray shape is shown in FIG. 13, and a protrusion 61 is provided on the lower surface of the turning passage 21a in order to make the velocity distribution in the section of the turning passage 21a more uniform.
  • An example is shown in FIG. Since the structure of the fuel injection valve 1 and the flow path structure 31 provided at the edge of the fuel introduction hole 5 serving as the opening of the nozzle body 2 are the same as those in the first embodiment, the description thereof is omitted.
  • FIG. 13 includes a valve body 6, a nozzle body 2 having a flow path structure 31, and an orifice plate 20.
  • a fuel injection hole 23as provided in the orifice plate has a swirl center axis of the swirl chamber. It is characterized in that it is inclined by ⁇ with respect to 41. The inclination of the fuel injection hole is used to obtain various spray shapes. However, since the swirling center and the fuel injection hole outlet center are shifted, the particle size is easily deteriorated unless the swirling flow is stronger. Accordingly, since the strength of turning is improved by making the cross-sectional velocity distribution in the turning passage 21a uniform by the flow path structure 33 according to the present invention, the inclined fuel as compared with the conventional shape without the flow path structure 33 is provided. Deterioration of the particle size due to the injection holes 23as can be reduced.
  • FIG. 14 is composed of a valve body 6, a nozzle body 2 having a flow path structure 31, and an orifice plate 20.
  • a protrusion 61 is provided near the entrance of the swirl chamber on the lower surface of the swirl passage 21a provided in the orifice plate.
  • the length 61 in the width direction of the protrusion 61 is 1/3 or less of the turning passage length L, and the height h of the protrusion 61 is formed to be 1/6 or less of the turning passage height H. .
  • the fast flow generated on the bottom surface of the turning passage 21a can be deflected to the upward flow of the flow path, and the velocity distribution in the section of the turning passage 21a can be made more uniform. Can do.
  • the flow path structures 31, 32a, 32b, 32c, 32d, 33, and 34 have a notch-like structure.
  • SYMBOLS 1 Fuel injection valve, 2 ... Nozzle body, 2a ... Lower surface of nozzle body, 2b ... Orifice plate inflow part, 3 ... Valve seat surface, 3a ... Seat part, 4 ... Fuel injection chamber, 5 ... Fuel introduction hole, 6 ... Valve body, 7 ... Core, 8 ... Spring, 9 ... Spring adjuster, 10 ... Yoke, 11 ... Electromagnetic coil, 12 ... Fuel passage, 13 ... Thin pipe, 14 ... Filter, 15 ... Resin mold, 20 ... Orifice plate, 20a ... upper surface, 21a, 21b, 21c, 21d ... turning passage, 22a, 22b, 22c, 22d ...

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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)
PCT/JP2014/060671 2013-04-26 2014-04-15 燃料噴射弁 Ceased WO2014175112A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IN1033DEN2015 IN2015DN01033A (enrdf_load_stackoverflow) 2013-04-26 2014-04-15
CN201480002181.XA CN104603444A (zh) 2013-04-26 2014-04-15 燃料喷射阀

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-093180 2013-04-26
JP2013093180A JP2014214682A (ja) 2013-04-26 2013-04-26 燃料噴射弁

Publications (1)

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WO2014175112A1 true WO2014175112A1 (ja) 2014-10-30

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PCT/JP2014/060671 Ceased WO2014175112A1 (ja) 2013-04-26 2014-04-15 燃料噴射弁

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JP (1) JP2014214682A (enrdf_load_stackoverflow)
CN (1) CN104603444A (enrdf_load_stackoverflow)
IN (1) IN2015DN01033A (enrdf_load_stackoverflow)
WO (1) WO2014175112A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020002845A (ja) * 2018-06-27 2020-01-09 株式会社Ｓｏｋｅｎ 燃料噴射弁

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016211525A (ja) * 2015-05-14 2016-12-15 株式会社エンプラス 燃料噴射装置用ノズルプレート
JP6549508B2 (ja) * 2016-03-14 2019-07-24 日立オートモティブシステムズ株式会社 燃料噴射弁
CN111279066B (zh) * 2017-11-01 2022-03-01 三菱电机株式会社 燃料喷射阀
JP2019183848A (ja) * 2019-06-27 2019-10-24 日立オートモティブシステムズ株式会社 燃料噴射弁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000508739A (ja) * 1997-01-30 2000-07-11 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射弁
JP2011190728A (ja) * 2010-03-12 2011-09-29 Mitsubishi Electric Corp 燃料噴射弁
JP2012158995A (ja) * 2011-01-31 2012-08-23 Hitachi Automotive Systems Ltd 燃料噴射弁

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4296519B2 (ja) * 2006-12-19 2009-07-15 株式会社日立製作所 燃料噴射弁
JP5537512B2 (ja) * 2011-07-25 2014-07-02 日立オートモティブシステムズ株式会社 燃料噴射弁

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000508739A (ja) * 1997-01-30 2000-07-11 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射弁
JP2011190728A (ja) * 2010-03-12 2011-09-29 Mitsubishi Electric Corp 燃料噴射弁
JP2012158995A (ja) * 2011-01-31 2012-08-23 Hitachi Automotive Systems Ltd 燃料噴射弁

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020002845A (ja) * 2018-06-27 2020-01-09 株式会社Ｓｏｋｅｎ 燃料噴射弁
JP7040320B2 (ja) 2018-06-27 2022-03-23 株式会社デンソー 燃料噴射弁

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IN2015DN01033A (enrdf_load_stackoverflow) 2015-06-26
JP2014214682A (ja) 2014-11-17
CN104603444A (zh) 2015-05-06

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