WO2023068222A1 - 燃料噴射弁の支持構造 - Google Patents

燃料噴射弁の支持構造 Download PDF

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Publication number
WO2023068222A1
WO2023068222A1 PCT/JP2022/038575 JP2022038575W WO2023068222A1 WO 2023068222 A1 WO2023068222 A1 WO 2023068222A1 JP 2022038575 W JP2022038575 W JP 2022038575W WO 2023068222 A1 WO2023068222 A1 WO 2023068222A1
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WO
WIPO (PCT)
Prior art keywords
fuel
injection valve
base plate
fuel injection
elastic
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/JP2022/038575
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
淳 岡本
貴也 福永
和樹 野田
拓実 鈴木
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.)
Astemo Ltd
Original Assignee
Hitachi Astemo 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 Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to CN202280053824.8A priority Critical patent/CN117795188A/zh
Priority to JP2023554672A priority patent/JP7526370B2/ja
Priority to US18/291,352 priority patent/US20240209819A1/en
Publication of WO2023068222A1 publication Critical patent/WO2023068222A1/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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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

Definitions

  • the present invention relates to a support structure for a fuel injection valve used in an engine, and in particular, a fuel nozzle cylindrical portion of a valve housing is fitted into an injection valve mounting hole of the engine, and a fuel introduction cylindrical portion of the valve housing is provided with: A fuel supply cap of a fuel distribution pipe supported by the engine is fitted, and an elastic support member is interposed between the valve housing and the fuel supply cap to bias the valve housing toward the injection valve mounting hole.
  • the present invention also relates to an improvement in the support structure of the fuel injection valve, whereby the fuel injection valve is elastically sandwiched between the engine and the fuel supply cap to prevent its axial movement.
  • a support structure for such a fuel injection valve is already known as disclosed in Patent Document 1 below.
  • JP 2013-174227 A Japanese Patent Publication No. 2002-516957
  • an elastic support member is attached in advance to a fixed position of the fuel injection valve. It shall not fall off or slip out of the valve.
  • a pair of clamping pieces are connected to the base plate of the elastic support member and extend from one end of the base plate toward the cylinder portion of the fuel nozzle. Both flat side surfaces of the valve housing are resiliently clamped by these clamping pieces.
  • the elastic support member is attached to the fuel injection valve by a snap engagement structure. sexuality worsens. Therefore, if the engagement force is set weak in consideration of the ease of installation, there is a risk that the elastic support member will separate from the fuel injection valve due to vibrations of the engine when the fuel injection valve is attached to the engine.
  • a support structure for a fuel injection valve that can prevent an elastic support member from separating from the fuel injection valve by automatically strengthening a snap engaging force when the fuel injection valve is attached to an engine. for the purpose.
  • a fuel nozzle cylindrical portion of a valve housing is fitted into an injection valve mounting hole of an engine, and a fuel supply cap of a fuel distribution pipe supported by the engine is fitted into a fuel introduction cylinder portion of the valve housing.
  • an elastic support member is interposed between the valve housing and the fuel supply cap to bias the valve housing toward the injection valve mounting hole, and the elastic support member extends the outer circumference of the fuel introduction cylindrical portion.
  • the first feature is that the snap engaging force of the snap protrusion with respect to the fuel introduction tubular portion increases due to the increase in .
  • the present invention has a second feature that a first notch is provided in an intermediate portion between both outer side surfaces of the base plate.
  • the present invention has a third feature that the base plate is provided with a second notch adjacent to the base of the elastic piece.
  • the fuel injection valve when adopting a snap-engagement structure, even if the engagement force is set with priority given to the attachment of the fuel injection valve to the elastic support member, the fuel injection valve can be attached to the engine. In the attached state, the contact friction force of the elastic piece against the base plate increases due to the repulsive force of the elastic piece, and the opening resistance of the notch in the base plate increases. The resistance is increased, thereby preventing the elastic support member from falling off from the fuel injection valve. Moreover, the adoption of the snap-engagement structure simplifies the structure of the elastic support member, thereby reducing the cost.
  • the first cuts are provided in the intermediate portions of both outer sides of the base plate, so that the contact area of the tip of the elastic piece on the base plate does not change, and the height of the snap projection does not change.
  • the spring constant of the base plate can be reduced without changing the spring constant of the base plate, thereby reducing the snap engagement force and improving the attachment of the elastic support member to the fuel injection valve.
  • the base plate is provided with the second notch adjacent to the base of the elastic piece, so that, similarly to the above, the contact area of the tip of the elastic piece on the base plate does not change. Also, the spring constant of the base plate can be reduced without changing the height of the snap projection, thereby reducing the snap engagement force and improving the attachment of the elastic support member to the fuel injection valve. be able to.
  • FIG. 1 is a partially longitudinal front view showing a support structure for fuel injection valves in a multi-cylinder engine according to an embodiment of the present invention
  • FIG. FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1; 3-3 line cross-sectional view of FIG. FIG. 2 is a single perspective view of an elastic support member in each figure;
  • the cylinder head Eh of the multi-cylinder engine E has a plurality of fuel injection valves I capable of injecting fuel into the combustion chambers Ec of a plurality of cylinders, and fuel is distributed to these fuel injection valves I.
  • a fuel distribution pipe D is attached.
  • a resilient support structure with resilient support members S is used to hold each fuel injector I in place. Its structure is detailed below.
  • Each fuel injection valve I has a cylindrical valve housing 1 at its center.
  • the front end of the valve housing 1 is a fuel nozzle cylinder 2, the rear end is a fuel introduction cylinder 4, and the intermediate part is an electromagnetic coil 3.
  • the electromagnetic coil 3 When the electromagnetic coil 3 is energized, the fuel nozzle cylinder 2
  • the inner valve is opened to inject the fuel introduced by the fuel introduction tube portion 4 from the fuel distribution pipe D into the corresponding combustion chamber Ec.
  • the electromagnetic coil portion 3 is covered with a synthetic resin molded portion 6, and a coupler 14 for supplying power to the electromagnetic coil portion 3 is integrally protruded from one side of the synthetic resin molded portion 6. As shown in FIG.
  • An annular seal/cushion member 8 is attached to the outer circumference of the fuel nozzle cylindrical portion 2 so as to be in close contact with the front end face of the synthetic resin molded portion 6 . Also, an O-ring 9 is attached to the seal groove 4a on the outer periphery of the fuel introduction cylindrical portion 4. As shown in FIG.
  • a flat base surface 5 is formed on the rear end surface of the synthetic resin molded portion 6 facing the fuel introduction tubular portion 4 side.
  • the cylinder head Eh is provided with an injection valve mounting hole 10 whose inner end is open on the ceiling surface of each combustion chamber Ec, and an annular concave portion 11 surrounding the outer opening end.
  • the fuel nozzle cylindrical portion 2 of the fuel injection valve I is fitted in the recess 11, and the seal/cushion member 8 is housed in the recess 11. As shown in FIG.
  • the fuel distribution pipe D is arranged along the direction in which the cylinders of the engine E are arranged, and fuel is pumped from one end thereof by a fuel pump (not shown).
  • a flat stopper surface 7 parallel to the axis A of the valve housing 1 is formed on the outer surface of each fuel supply cap Da.
  • a bracket Db is fixed to the base of each fuel supply cap Da, and this bracket Db is fixed by a bolt 13 to a column 12 erected on the upper surface of the cylinder head Eh.
  • the elastic support member S is formed by pressing a steel plate, and is composed of a base plate 15, an elastic piece 16 and a positioning piece 18.
  • the base plate 15 is placed on top of the base surface 5 and has a U-shaped notch 19 in the center thereof for receiving the fuel introduction tubular portion 4 .
  • the width of this notch 19 is set slightly larger than the outer diameter of the fuel introduction cylindrical portion 4 .
  • a pair of elastic pieces 16 are integrally connected to elastically contact the front end surface of the fuel supply cap Da. Both elastic pieces 16 are spaced apart to receive the valve housing 1 therebetween.
  • Each elastic piece 16 has a first elastic portion 16a bent upward from one end of the base plate 15 in a horizontal U-shape, and an upward curved portion extending from the first elastic portion 16a toward the other end.
  • the tip portion 16ba is formed of a second elastic portion 16b that slidably contacts the upper surface of the base plate 15, and the radius of curvature R2 of the second elastic portion 16b is larger than the radius of curvature R1 of the first elastic portion 16a. It is set large enough (see FIG. 4).
  • the distance L1 (see FIG. 4) from the top of the second elastic portion 16b to the bottom surface of the base plate 15 is the distance L2 (see FIG. 4) from the base surface 5 to the front end surface of the fuel supply cap Da. (See FIG. 2). Therefore, when the base plate 15 and the elastic piece 16 are inserted between the base surface 5 and the fuel supply cap Da, the elastic piece 16 flexes the first and second elastic portions 16a and 16b, thereby moving the front end surface of the fuel supply cap Da. will come into contact with the The tip portion 16ba of the second elastic portion 16b can slide on the upper surface of the base plate 15 when the first and second elastic portions 16a and 16b are bent. It has a shape.
  • One end of the base plate 15 is integrally provided with a positioning piece 18 standing vertically upward from between a pair of elastic pieces 16. This positioning piece 18 abuts on the stopper surface 7 of the fuel supply cap Da. It is possible.
  • a pair of snap projections 21 that can be snap-engaged with the outer peripheral surface of the fuel introduction tubular portion 4 received in the notch 19 are formed on both inner side surfaces of the base plate 15 facing the U-shaped notch 19 . That is, the distance between the pair of snap projections 21 is set narrower than the outer diameter of the fuel introduction tubular portion 4, and in the process of receiving the fuel introduction tubular portion 4 in the notch 19, the base plate 15 is moved in the opening direction of the notch 19. While being bent, it rides on the diameter part of the fuel introduction cylinder part 4, and when it passes through the diameter part, the notch 19 is closed by the elastic restoring force of the base plate 15 to the original position, so that the snap projection 21 is attached to the fuel introduction cylinder part 4. , and the engagement force prevents the elastic support member S from coming off from the fuel introduction cylindrical portion 4 .
  • a pair of first cuts 23 are provided in the intermediate portions of both outer side surfaces of the base plate 15 .
  • the base plate 15 is provided with a pair of second cuts 24 adjacent to the roots of the elastic pieces 16 .
  • a detent projection 20 projecting from the base surface 5 between the valve housing 1 and the coupler 14 is integrally formed on the synthetic resin molded portion 6. 5 and the fuel supply cap Da, the notch 19 of the base plate 15 and the tips 16ba of the pair of elastic pieces 16, which elastically contact the base plate 15, engage with each other. It has become.
  • the elastic support member S is attached to the fuel introduction cylindrical portion 4 of the fuel injection valve I in advance as follows.
  • the elastic support member S is moved from the outside of the fuel injection valve I on the opposite side of the coupler 14 to the inside of the notch 19 and both elastic pieces. 16 so as to receive the fuel introduction tubular portion 4 and push it in.
  • the snap projections 21 move toward the base plate in the opening direction of the notch 19. 15 is deflected, it rides on the diameter part of the fuel introduction cylindrical part 4, and when it passes through the diameter part, the snap projection 21 is engaged with the fuel introduction by closing the notch 19 to the original position by the elastic restoring force of the base plate 15.
  • the elastic support member S can be held in the fuel introduction cylinder portion 4 by snap engagement with the rear surface side of the cylinder portion 4, and the elastic support member S can be held in the fuel introduction cylinder portion 4 during transportation. can be prevented.
  • the anti-rotation protrusion 20 of the synthetic resin molded portion 6 engages between the notch 19 of the base plate 15 of the elastic support member S and between the pair of elastic pieces 16 .
  • the fuel injection valve I and the elastic support member S are connected to each other so as not to rotate about the axis A of the valve housing 1 .
  • the fuel supply cap Da of the fuel distribution pipe D is fitted into the fuel introduction cylindrical portion 4 of the fuel injection valve I.
  • the positioning piece 18 of the elastic support member S abuts against the stopper surface 7 of the fuel supply cap Da. This abutment prevents the elastic support member S from rotating with respect to the fuel supply cap Da.
  • the anti-rotation protrusion 20 of the synthetic resin molded portion 6 is already engaged between the notch 19 of the base plate 15 of the elastic support member S and the pair of elastic pieces 16, the fuel injection valve I is thereby , the fuel supply cap Da, rotation of the valve housing 1 about the axis A is prevented.
  • the fuel nozzle cylindrical portion 2 of the fuel injection valve I is inserted into the injection valve mounting hole 10 of the cylinder head Eh, and the seal/cushion member 8 in close contact with the front end face of the synthetic resin molded portion 6 is accommodated in the recess 11 . Then, while applying a compressive load to the elastic support member S, the bracket Db is fixed to the column 12 of the cylinder head Eh with the bolts 13 .
  • the pair of elastic pieces 16 bend the front end of the fuel supply cap Da on the plane including the axis A of the valve housing 1 by the vertex of the second elastic portion 16b while bending the first and second elastic portions 16a and 16b. Press the surface elastically. Since the bending repulsive force of the elastic piece 16 presses the base plate 15 against the base surface 5, the fuel injection valve I is provided with an elastic support member S and a seal between the cylinder head Eh and the fuel supply cap Da. It is elastically sandwiched via the cushion member 8 . Moreover, since the pushing reaction force of the elastic piece 16 against the fuel supply cap Da acts on the fuel injection valve I along its central axis A, the fuel injection valve I is not tilted and is supported. can be stabilized.
  • the contact frictional force of the elastic piece 16 with respect to the base plate 15 increases.
  • the opening resistance of the notch 19 will increase. This means an increase in resistance to separation of the snap projection 21 from the fuel introduction tubular portion 4, that is, an increase in snap engaging force.
  • the elastic support member S can be prevented from coming off from the fuel injection valve I due to vibrations of the engine E or the like.
  • the snap engaging force of the snap protrusion 21 can be appropriately set by prioritizing the attachment of the elastic support member S to the fuel injection valve I, and the state in which the fuel injection valve I is attached to the engine E together with the fuel supply cap Da. Then, it is possible to simultaneously increase the snap engagement force. Moreover, the adoption of the snap-engagement structure eliminates the need to continuously provide a pair of clamping pieces as described in Patent Document 1 on the base plate 15 of the elastic support member S, thereby simplifying the structure of the elastic support member S. can be achieved and costs can be reduced.
  • the first cuts 23 are provided in the intermediate portions on both outer sides of the base plate 15 . According to this, the spring constant of the base plate 15 can be reduced without changing the contact area of the tip portion of the elastic piece 16 on the base plate 15 and without changing the height of the snap projection 21, and the snap engagement force can be properly adjusted. can be reduced.
  • the base plate 15 is provided with a second cut 24 adjacent to the base of the elastic piece 16 . According to this, similarly to the above, the snap engagement force can be moderately reduced. Furthermore, if both methods are adopted at the same time, the snap engagement force can be further reduced.
  • the fuel injection valve I attached to the engine E is prevented from rotating about the axis A of the valve housing 1 with respect to the fuel supply cap Da via the elastic support member S, so that the fuel nozzle cylindrical portion The direction of the injected fuel from 2 can always be stabilized.
  • the anti-rotation protrusion 20 of the synthetic resin molded portion 6 is attached to the base plate of the elastic support member S, which is originally provided. Since this is achieved by engaging the 15 notches 19 and between the pair of elastic pieces 16, complication of the elastic support member S can be avoided. Further, the anti-rotation projection 20 is integrally molded with the coupler 14 on the synthetic resin molded portion 6 covering the valve housing 1 so as to embed the electromagnetic coil portion 3, thereby increasing the number of processes for each member. cost increase can be avoided.
  • the anti-rotation protrusion 20 is arranged between the valve housing 1 and the coupler 14, when the elastic support member S is attached to the fuel injection valve I, by attaching it from the opposite side of the coupler 14, it will not interfere with the coupler 14.
  • the elastic support member S can be easily engaged with the anti-rotation snap projection 20 without being twisted, and the assembling property is good.
  • each elastic piece 16 has a first elastic portion 16a with a small curvature radius R1 connected to one end of the base plate 15, and a tip end on the upper surface of the other end of the base plate 15 extending from the first elastic portion 16a. Since the second elastic portion 16b having a large curvature radius R2 is configured to slidably abut the portion 16ba, the second elastic portion 16b is connected to the base plate through the tip portion 16ba and the first elastic portion 16a. Therefore, even if the first elastic portion 16a is plastically deformed (generally, the portion bent with a small curvature radius is likely to be plastically deformed), the second elastic portion 16a is supported by both ends.
  • each elastic piece 16 Due to the elastic force of the elastic portion 16b, it is possible to maintain the urging function of each elastic piece 16 with respect to the fuel supply cap Da. Moreover, by making the radius of curvature R2 of the second elastic portion 16b larger than the radius of curvature R1 of the first elastic portion 16a, the height of each elastic piece 16 is kept as low as possible, and the base surface 5 and the fuel supply cap Da It is possible to easily mount the elastic support member S in a narrow space between them.
  • the present invention is not limited thereto, and various design changes are possible without departing from the gist of the present invention.
  • the present invention can be applied to a structure in which the fuel injection valve I is attached to the intake system of the engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
PCT/JP2022/038575 2021-10-19 2022-10-17 燃料噴射弁の支持構造 Ceased WO2023068222A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202280053824.8A CN117795188A (zh) 2021-10-19 2022-10-17 燃料喷射阀的支承结构
JP2023554672A JP7526370B2 (ja) 2021-10-19 2022-10-17 燃料噴射弁の支持構造
US18/291,352 US20240209819A1 (en) 2021-10-19 2022-10-17 Support structure for fuel injection valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021171223 2021-10-19
JP2021-171223 2021-10-19

Publications (1)

Publication Number Publication Date
WO2023068222A1 true WO2023068222A1 (ja) 2023-04-27

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PCT/JP2022/038575 Ceased WO2023068222A1 (ja) 2021-10-19 2022-10-17 燃料噴射弁の支持構造

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US (1) US20240209819A1 (https=)
JP (1) JP7526370B2 (https=)
CN (1) CN117795188A (https=)
WO (1) WO2023068222A1 (https=)

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Publication number Priority date Publication date Assignee Title
JPH0833922A (ja) * 1994-05-17 1996-02-06 Amada Metrecs Co Ltd プレスブレーキ用上型
JP2008514861A (ja) * 2004-10-01 2008-05-08 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 燃料噴射装置のための支持クランプ及び燃料噴射装置
JP2010168965A (ja) * 2009-01-21 2010-08-05 Denso Corp 燃料噴射装置
JP2011091460A (ja) * 2011-02-09 2011-05-06 Fuji Mach Mfg Co Ltd 基板保持装置
JP2013174227A (ja) * 2012-02-27 2013-09-05 Keihin Corp 燃料噴射弁の支持構造

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JP4759552B2 (ja) * 2007-10-23 2011-08-31 本田技研工業株式会社 燃料噴射弁の取付構造
JP5136435B2 (ja) * 2009-01-21 2013-02-06 株式会社デンソー 燃料噴射装置
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KR101938481B1 (ko) * 2017-06-23 2019-01-14 주식회사 현대케피코 인젝터용 클립
KR20190001367A (ko) * 2017-06-27 2019-01-04 주식회사 현대케피코 연료레일 인젝터 고정 구조
WO2023068223A1 (ja) * 2021-10-19 2023-04-27 日立Astemo株式会社 燃料噴射弁の支持構造

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0833922A (ja) * 1994-05-17 1996-02-06 Amada Metrecs Co Ltd プレスブレーキ用上型
JP2008514861A (ja) * 2004-10-01 2008-05-08 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 燃料噴射装置のための支持クランプ及び燃料噴射装置
JP2010168965A (ja) * 2009-01-21 2010-08-05 Denso Corp 燃料噴射装置
JP2011091460A (ja) * 2011-02-09 2011-05-06 Fuji Mach Mfg Co Ltd 基板保持装置
JP2013174227A (ja) * 2012-02-27 2013-09-05 Keihin Corp 燃料噴射弁の支持構造

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JPWO2023068222A1 (https=) 2023-04-27
US20240209819A1 (en) 2024-06-27
JP7526370B2 (ja) 2024-07-31
CN117795188A (zh) 2024-03-29

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