JP2015183581A - Solenoid fuel injection valve - Google Patents

Solenoid fuel injection valve Download PDF

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JP2015183581A
JP2015183581A JP2014060359A JP2014060359A JP2015183581A JP 2015183581 A JP2015183581 A JP 2015183581A JP 2014060359 A JP2014060359 A JP 2014060359A JP 2014060359 A JP2014060359 A JP 2014060359A JP 2015183581 A JP2015183581 A JP 2015183581A
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coil assembly
yoke
valve
fuel injection
rear end
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JP6337391B2 (en
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順一 田代
Junichi Tashiro
順一 田代
中村　順一
Junichi Nakamura
順一 中村
剛 太田
Takeshi Ota
剛 太田
純平 古川
Jumpei Furukawa
純平 古川
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Keihin Corp
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Keihin Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a well-assemblable solenoid fuel injection valve including a yoke which can be held in its fitted state when once fitted to a coil assembly at its lateral side, and can be moved into a process so as to be fastened to the outer peripheral face of a valve housing while being prevented from falling.SOLUTION: The solenoid fuel injection valve includes a yoke 31 having a side wall part 44 for covering the outer peripheral face of a coil assembly 28, and a front end wall part 45 and a rear end wall part 46 to be fastened to the outer peripheral face of a valve housing 2 in opposition to both front and rear end faces of the coil assembly 28. On the end face of at least one of the front and rear parts of a synthetic resin bobbin 29 of the coil assembly 28, a temporary lock protrusion 40 is integrally provided which is pressed by the front end wall part 45 or the rear end wall part 46 when the yoke 31 is fitted to the coil assembly 28 at its lateral side, to hold the yoke 31 at a position where it is fitted to the coil assembly 28.

Description

本発明は，主として内燃機関の燃料供給系に使用される電磁式燃料噴射弁に関し，特に，弁座部材，磁性円筒体，非磁性円筒体及び固定コアを前端から後端に向かって順次連ねてなり，内部が燃料流路となる弁ハウジングと，前記固定コア及び非磁性円筒体に亙りそれらの外周に配設されるコイル組立体と，このコイル組立体を覆い，コイル組立体への通電時，前記固定コア及び磁性円筒体間に磁気回路を形成するヨークと，前記弁座部材と協働する弁体と，この弁体に連結されて前記磁性円筒体内に嵌挿され，前記磁気回路の形成時，前記固定コアに吸引されて前記弁体を開弁する可動コアとを備えてなり，前記ヨークは，前記コイル組立体の外周面を覆う側壁部と，この側壁部の両端から半径内方に屈曲して前記コイル組立体の前後両端面に対向し，前記弁ハウジングの外周面に固着される前端壁部及び後端壁部とを有する電磁式燃料噴射弁の改良に関する。   The present invention relates to an electromagnetic fuel injection valve mainly used for a fuel supply system of an internal combustion engine. In particular, a valve seat member, a magnetic cylindrical body, a nonmagnetic cylindrical body, and a fixed core are successively connected from the front end to the rear end. A valve housing having a fuel flow path inside, a coil assembly disposed on the outer periphery of the fixed core and the non-magnetic cylinder, and covering the coil assembly when the coil assembly is energized. , A yoke that forms a magnetic circuit between the fixed core and the magnetic cylinder, a valve body that cooperates with the valve seat member, and a valve body that is connected to the valve body and is inserted into the magnetic cylinder, A movable core that opens the valve body by being sucked by the fixed core at the time of formation, and the yoke includes a side wall portion that covers the outer peripheral surface of the coil assembly and a radius within both ends of the side wall portion. Bend toward the front and rear ends of the coil assembly The opposite, an improvement of an electromagnetic fuel injection valve and a front end wall portion is fixed to the outer peripheral surface and the rear wall portion of the valve housing.

かゝる電磁式燃料噴射弁は，下記特許文献１に開示されるように，本発明出願人によって既に提案されている。   Such an electromagnetic fuel injection valve has already been proposed by the applicant of the present invention as disclosed in Patent Document 1 below.

特開２０１１−２７００９号公報JP 2011-27209 A

ところで，かゝる電磁式燃料噴射弁では，その組立時，コイル組立体に，その側方からヨークを嵌合する工程と，その後，ヨークを弁ハウジングの外周面に溶接等により固着する工程とを行うのであるが，前者の工程から後者の工程に移る間に，ヨークがコイル組立体から脱落することがあり，組立性が良好とは言えなかった。   By the way, in such an electromagnetic fuel injection valve, at the time of assembly, a step of fitting a yoke to the coil assembly from the side, and a step of fixing the yoke to the outer peripheral surface of the valve housing by welding or the like thereafter. However, during the transition from the former process to the latter process, the yoke may fall off from the coil assembly, and it cannot be said that the assemblability is good.

本発明は，かゝる事情に鑑みてなされたもので，コイル組立体に，その側方からヨークを一旦嵌合したならば，その嵌合状態を保持することができ，ヨークの脱落を防ぎながら，ヨークを弁ハウジングの外周面に固着する工程に移すことができるようにした，組立性が良好な前記電磁式燃料噴射弁を提供することを目的とする。   The present invention has been made in view of such circumstances, and once the yoke is fitted to the coil assembly from the side, the fitted state can be maintained, and the yoke is prevented from falling off. However, an object of the present invention is to provide the electromagnetic fuel injection valve with good assemblability, which can be transferred to the step of fixing the yoke to the outer peripheral surface of the valve housing.

上記目的を達成するために，本発明は，弁座部材，磁性円筒体，非磁性円筒体及び固定コアを前端から後端に向かって順次連ねてなり，内部が燃料流路となる弁ハウジングと，前記固定コア及び非磁性円筒体に亙りそれらの外周に配設されるコイル組立体と，このコイル組立体を覆い，コイル組立体への通電時，前記固定コア及び磁性円筒体間に磁気回路を形成するヨークと，前記弁座部材と協働する弁体と，この弁体に連結されて前記磁性円筒体内に嵌挿され，前記磁気回路の形成時，前記固定コアに吸引されて前記弁体を開弁する可動コアとを備え，前記ヨークは，前記コイル組立体の外周面を覆う側壁部と，この側壁部の両端から半径内方に屈曲して前記コイル組立体の前後両端面に対向し，前記弁ハウジングの外周面に固着される前端壁部及び後端壁部とを有する電磁式燃料噴射弁において，前記コイル組立体の合成樹脂製のボビンの前部及び後部の少なくとも一方の端面に，前記ヨークを前記コイル組立体にその側方から嵌合したとき，前記前端壁部又は前記後端壁部により圧迫されてヨークをコイル組立体との嵌合位置に保持する仮止め突起を一体に突設したことを第１の特徴とする。   In order to achieve the above object, the present invention comprises a valve housing comprising a valve seat member, a magnetic cylinder, a non-magnetic cylinder and a fixed core sequentially connected from the front end to the rear end, and the inside being a fuel flow path. A coil assembly disposed on the outer periphery of the fixed core and the non-magnetic cylinder, and covering the coil assembly and energizing the coil assembly between the fixed core and the magnetic cylinder. And a valve body cooperating with the valve seat member, and connected to the valve body and inserted into the magnetic cylindrical body, and when the magnetic circuit is formed, the valve is sucked by the fixed core A movable core that opens the body, and the yoke has a side wall covering the outer peripheral surface of the coil assembly, and is bent radially inward from both ends of the side wall to the front and rear end surfaces of the coil assembly. Before facing the outer periphery of the valve housing In the electromagnetic fuel injection valve having a wall portion and a rear end wall portion, at least one end surface of a front portion and a rear portion of a synthetic resin bobbin of the coil assembly, the yoke is disposed laterally to the coil assembly. The first feature is that a temporary fixing protrusion that is pressed by the front end wall portion or the rear end wall portion to hold the yoke in a fitting position with the coil assembly is integrally provided. .

また本発明は，第１の特徴に加えて，前記ボビンの前部及び後部の少なくとも一方の端面に，その周方向に沿って前記仮止め突起を複数配列したことを第２の特徴とする。   In addition to the first feature, the present invention has a second feature in that a plurality of the temporary fixing projections are arranged along the circumferential direction on at least one end surface of the front portion and the rear portion of the bobbin.

さらに本発明は，第１又は第２の特徴に加えて，前記コイル組立体及びヨークを埋封しながら，前記コイル組立体の一側方に突出するカプラを形成する合成樹脂製の被覆層をモールド成形すると共に，この被覆層に前記仮止め突起を溶着させたことを第３の特徴とする。   In addition to the first or second feature, the present invention further includes a synthetic resin coating layer that forms a coupler projecting to one side of the coil assembly while embedding the coil assembly and the yoke. A third feature is that the temporary fixing protrusion is welded to the coating layer while being molded.

本発明の第１の特徴によれば，ヨークをコイル組立体に，その側方から嵌合すると，ボビンの端面より突出した仮止め突起がボビンに圧迫され，その反力により，ヨークは，コイル組立体との嵌合状態に保持される仮止め状態となる。したがって，弁ハウジング，コイル組立体及びヨークを次の固着工程に移す間に，ヨークがコイル組立体から脱落することを防ぐことができ，組立性が向上する。しかも弁ハウジングのコイル組立体に対する嵌合荷重は，仮止め突起に弾性変形を生じさせるだけの小荷重で足り，その嵌合をスムーズに行うことができる。   According to the first feature of the present invention, when the yoke is fitted to the coil assembly from the side, the temporary fixing projection protruding from the end surface of the bobbin is pressed against the bobbin, and the reaction force causes the yoke to The temporarily fixed state is maintained in the fitted state with the assembly. Therefore, it is possible to prevent the yoke from falling off from the coil assembly while the valve housing, the coil assembly and the yoke are moved to the next fixing process, and the assemblability is improved. In addition, the fitting load of the valve housing with respect to the coil assembly is small enough to cause elastic deformation of the temporary fixing projection, and the fitting can be smoothly performed.

本発明の第２の特徴によれば，弁ハウジングのコイル組立体に対する嵌合姿勢を安定させることができる。   According to the 2nd characteristic of this invention, the fitting attitude | position with respect to the coil assembly of a valve housing can be stabilized.

本発明の第３の特徴によれば，仮止め突起は，被覆層に対するアンカ効果を発揮してボビン及び被覆層の結合力を高め，被覆層のコイル組立体に対する防水性を向上させることができる。   According to the third feature of the present invention, the temporary fixing protrusion can exert an anchor effect on the coating layer to increase the bonding force between the bobbin and the coating layer, and can improve the waterproof property of the coating layer to the coil assembly. .

本発明の実施形態に係る電磁式燃料噴射弁の縦断面図。The longitudinal cross-sectional view of the electromagnetic fuel injection valve which concerns on embodiment of this invention. ボビンの後端面図。The rear end view of a bobbin. ヨークの斜視図。The perspective view of a yoke. 電磁式燃料噴射弁の組立要領説明図。The assembly point explanatory drawing of an electromagnetic fuel injection valve.

本発明の実施形態を添付図面に基づいて以下に説明する。尚，本発明の電磁式燃料噴射弁において，燃料噴射側を前方，燃料入口側を後方という。   Embodiments of the present invention will be described below with reference to the accompanying drawings. In the electromagnetic fuel injection valve of the present invention, the fuel injection side is referred to as the front, and the fuel inlet side is referred to as the rear.

図１において，エンジン用の電磁式燃料噴射弁Ｉの弁ハウジング２は，円筒状の弁座部材３と，この弁座部材３の後端部に嵌合して液密に溶接される磁性円筒体４と，この磁性円筒体４の後端に突き当てゝ液密に溶接される非磁性円筒体６と，この非磁性円筒体６の内周面に前端部を嵌合して液密に溶接される円筒状の固定コア５と，この固定コア５の後端部外周に嵌合して溶接される燃料入口筒２６とで構成される。   In FIG. 1, a valve housing 2 of an electromagnetic fuel injection valve I for an engine includes a cylindrical valve seat member 3 and a magnetic cylinder that is fitted to a rear end portion of the valve seat member 3 and is liquid-tightly welded. A body 4, a nonmagnetic cylindrical body 6 that is liquid-tightly welded against the rear end of the magnetic cylindrical body 4, and a front end portion is fitted to the inner peripheral surface of the nonmagnetic cylindrical body 6 to be liquid-tight. A cylindrical fixed core 5 to be welded and a fuel inlet cylinder 26 to be fitted to the outer periphery of the rear end of the fixed core 5 and welded.

弁座部材３は，その前端面に開口する弁孔７と，この弁孔７の内端に連なる円錐状の弁座８と，この弁座８の大径部に連なる円筒状のガイド孔９とを備えている。弁座部材３の前端面には，上記弁孔７と連通する複数の燃料噴孔１１を有する鋼板製のインジェクタプレート１０が液密に溶接される。   The valve seat member 3 includes a valve hole 7 that opens to a front end surface thereof, a conical valve seat 8 that is continuous with the inner end of the valve hole 7, and a cylindrical guide hole 9 that is continuous with a large diameter portion of the valve seat 8. And. A steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve hole 7 is welded to the front end surface of the valve seat member 3 in a liquid-tight manner.

非磁性円筒体６の前端部には，固定コア５と嵌合しない部分が残され，その部分から弁座部材３に至る弁ハウジング２内に弁組立体Ｖが収容される。   A portion that does not fit with the fixed core 5 remains at the front end portion of the nonmagnetic cylindrical body 6, and the valve assembly V is accommodated in the valve housing 2 that extends from the portion to the valve seat member 3.

弁組立体Ｖは，前記弁座８と協働して弁孔７を開閉するよう前記ガイド孔９を摺動し得る球状の弁体１４と，この弁体１４に溶接により結合される杆部１３を一体に備えた可動コア１２とで構成されるもので，その可動コア１２は，磁性円筒体４の内周面に摺動自在に嵌挿されると共に，固定コア５に対置される。球状の弁体１４の周囲には，燃料の通過を許容する複数の平坦面が形成される。   The valve assembly V includes a spherical valve body 14 that can slide in the guide hole 9 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and a flange portion that is coupled to the valve body 14 by welding. The movable core 12 is slidably fitted on the inner peripheral surface of the magnetic cylindrical body 4 and is opposed to the fixed core 5. A plurality of flat surfaces that allow the passage of fuel are formed around the spherical valve body 14.

弁組立体Ｖには，可動コア１２の後端から杆部１３の前端に至る縦孔１９と，この縦孔１９を杆部１３の外周面に開放する横孔２０とが設けられる。縦孔１９の途中には，縦孔１９の内周面より突出した環状のばね座２４が形成される。   The valve assembly V is provided with a vertical hole 19 that extends from the rear end of the movable core 12 to the front end of the flange 13, and a horizontal hole 20 that opens the vertical hole 19 to the outer peripheral surface of the flange 13. An annular spring seat 24 protruding from the inner peripheral surface of the vertical hole 19 is formed in the middle of the vertical hole 19.

固定コア５は，燃料入口筒２６の中空部と連通する縦孔２１を有し，この縦孔２１は，可動コア１２の縦孔１９と連通する。   The fixed core 5 has a vertical hole 21 communicating with the hollow portion of the fuel inlet cylinder 26, and the vertical hole 21 communicates with the vertical hole 19 of the movable core 12.

この固定コア５の縦孔２１にはすり割り付きパイプ状のリテーナ２３が圧入され，このリテーナ２３と前記ばね座２４との間に可動コア１２を弁体１４の閉弁側に付勢する弁ばね２２が縮設される。その際，リテーナ２３の縦孔２１への嵌合深さにより弁ばね２２のセット荷重が調整される。   A pipe-like retainer 23 is press-fitted into the vertical hole 21 of the fixed core 5, and a valve that urges the movable core 12 toward the valve closing side of the valve body 14 between the retainer 23 and the spring seat 24. The spring 22 is contracted. At that time, the set load of the valve spring 22 is adjusted by the depth of fitting of the retainer 23 into the vertical hole 21.

可動コア１２には，固定コア５に対向するその後端面より僅かに突出する非磁性材製でリング状のストッパ部材３７が埋設される。このストッパ部材３７は，固定及び可動コア５，１２相互の吸引時，ストッパ部材３７が固定コア５の前端面に当接することで，固定コア５及び可動コア１２の対向端面間に所定のギャップを残存させるものである。   A ring-shaped stopper member 37 made of a non-magnetic material that slightly protrudes from the rear end surface facing the fixed core 5 is embedded in the movable core 12. The stopper member 37 has a predetermined gap between the opposed end surfaces of the fixed core 5 and the movable core 12 by contacting the front end surface of the fixed core 5 when the fixed and movable cores 5 and 12 are attracted to each other. It will be left.

弁ハウジング２の外周には，固定コア５及び可動コア１２に対応してコイル組立体２８が嵌装される。このコイル組立体２８は，磁性円筒体４の後端部から固定コア５にかけてそれらの外周面に嵌合する合成樹脂製のボビン２９と，これに巻装されるコイル３０とからなっており，そのボビン２９の後端部には，その一側方に突出する給電端子３３の基端部を支持する支持腕２９ａが一体に形成され，給電端子３３にはコイル３０の端末が接続される。またボビン２９の後端面には，後述するヨーク３１を仮止めするための仮止め突起４０が周方向に沿って複数一体に形成される。   A coil assembly 28 is fitted to the outer periphery of the valve housing 2 so as to correspond to the fixed core 5 and the movable core 12. The coil assembly 28 is composed of a synthetic resin bobbin 29 fitted to the outer peripheral surface of the magnetic cylinder 4 from the rear end portion to the fixed core 5 and a coil 30 wound around the synthetic resin bobbin 29. A support arm 29 a is integrally formed at the rear end portion of the bobbin 29 to support the base end portion of the power supply terminal 33 protruding to one side, and the terminal of the coil 30 is connected to the power supply terminal 33. Further, a plurality of temporary fixing protrusions 40 for temporarily fixing a yoke 31 described later are integrally formed on the rear end surface of the bobbin 29 along the circumferential direction.

コイル組立体２８は，その略半周面をヨーク３１で覆われる。このヨーク３１は，磁性鋼板をプレス成形してなるもので，図１〜図３に示すように，コイル組立体２８の半周面を覆う半円筒状の側壁部４４と，この側壁部４４の両端から半径内方に屈曲してボビン２９の前後両端面に対向する半円板状の前端壁部４５及び後端壁部４６と，その前端壁部４５の内端から前方に延びて磁性円筒体４の外周面に嵌合される半円筒状の前ボス部４７と，後端壁部４６の内端から後方に延びて固定コア５の外周面に嵌合される半円筒状の後ボス部４８とで構成される。   The coil assembly 28 is covered with a yoke 31 on a substantially half circumferential surface thereof. The yoke 31 is formed by press-molding a magnetic steel plate. As shown in FIGS. 1 to 3, the yoke 31 has a semicylindrical side wall portion 44 that covers the half circumferential surface of the coil assembly 28, and both ends of the side wall portion 44. From the front end wall portion 45 and the rear end wall portion 46, which are bent inward in the radius and face the both front and rear end faces of the bobbin 29, and extend forward from the inner end of the front end wall portion 45 to the magnetic cylinder. A semi-cylindrical front boss portion 47 fitted to the outer peripheral surface of the rim 4, and a semi-cylindrical rear boss portion extending rearward from the inner end of the rear end wall portion 46 and fitted to the outer peripheral surface of the fixed core 5 48.

磁性円筒体４及び固定コア５の外周面が同一直径であることに対応して，前ボス部４７及び後ボス部４８の内周面は同一直径に形成される。こうしてヨーク３１の軸方向前半部及び後半部は，互いに対称形に形成される。したがって，前端壁部４５及び後端壁部４６は互換性があり，ヨーク３１の組みつけ方向を規定する必要がない。   Corresponding to the outer peripheral surfaces of the magnetic cylindrical body 4 and the fixed core 5 having the same diameter, the inner peripheral surfaces of the front boss portion 47 and the rear boss portion 48 are formed to have the same diameter. Thus, the first half and the second half in the axial direction of the yoke 31 are formed symmetrically with each other. Therefore, the front end wall portion 45 and the rear end wall portion 46 are interchangeable, and it is not necessary to define the assembly direction of the yoke 31.

前ボス部４７及び後ボス部４８の各先端には薄肉部４７ａ，４８ａが形成され，これら薄肉部４７ａ，４８ａを除いてヨーク３１の各部は同一肉厚に成形される。こうして，ヨーク３１では，前ボス部４７及び後ボス部４８間の磁気回路部分が同一肉厚に形成される。これにより，ヨーク３１の軽量化と磁気効率の両方を満足させることができる。   Thin portions 47a and 48a are formed at the front ends of the front boss portion 47 and the rear boss portion 48, and the portions of the yoke 31 are formed to have the same thickness except for the thin portions 47a and 48a. Thus, in the yoke 31, the magnetic circuit portion between the front boss portion 47 and the rear boss portion 48 is formed with the same thickness. Thereby, both the weight reduction and magnetic efficiency of the yoke 31 can be satisfied.

而して，このヨーク３１をコイル組立体２８に，その側方から嵌合すると，前ボス部４７が磁性円筒体４の外周面に，後ボス部４８が固定コア５の外周面にそれぞれ嵌合する。このとき，ボビン２９の後端面より突出した複数の仮止め突起４０が後端壁部４６に圧迫され，その反力により，ヨーク３１のコイル組立体２８への上記嵌合状態が保持されるようになっている。   Thus, when the yoke 31 is fitted to the coil assembly 28 from the side, the front boss portion 47 is fitted to the outer peripheral surface of the magnetic cylindrical body 4 and the rear boss portion 48 is fitted to the outer peripheral surface of the fixed core 5. Match. At this time, the plurality of temporary fixing protrusions 40 protruding from the rear end surface of the bobbin 29 are pressed against the rear end wall portion 46, and the above-mentioned fitting state of the yoke 31 to the coil assembly 28 is maintained by the reaction force. It has become.

前ボス部４７及び後ボス部４８の各薄肉部４７ａ，４８ａは，磁性円筒体４及び固定コア５の各外周面にレーザ溶接により固着される。   The thin portions 47a and 48a of the front boss portion 47 and the rear boss portion 48 are fixed to the outer peripheral surfaces of the magnetic cylindrical body 4 and the fixed core 5 by laser welding.

再び図１において，コイル組立体２８，固定コア５，及び燃料入口筒２６の後端部を除く部分には，これらを埋封する合成樹脂製の被覆層２７がモールド成形される。その際，給電端子３３を収容，保持してコイル組立体２８の一側方に突出するカプラ３４が被覆層２７と一体に成形される。   Referring again to FIG. 1, a synthetic resin coating layer 27 for embedding them is molded at portions other than the coil assembly 28, the fixed core 5, and the rear end portion of the fuel inlet cylinder 26. At this time, a coupler 34 that accommodates and holds the power supply terminal 33 and protrudes to one side of the coil assembly 28 is formed integrally with the coating layer 27.

被覆層２７の後端面と，燃料入口筒２６の後端のフランジ２６ａとの間において，燃料入口筒２６の外周面にＯリング５１が装着される。また磁性円筒体４の外周には，被覆層２７の前端面に密接するシール部材５２が装着される。燃料入口筒２６の入口には燃料フィルタ４３が装着される。   An O-ring 51 is attached to the outer peripheral surface of the fuel inlet tube 26 between the rear end surface of the coating layer 27 and the flange 26 a at the rear end of the fuel inlet tube 26. A seal member 52 that is in close contact with the front end surface of the coating layer 27 is attached to the outer periphery of the magnetic cylindrical body 4. A fuel filter 43 is attached to the inlet of the fuel inlet cylinder 26.

次に，この実施形態の作用について説明する。   Next, the operation of this embodiment will be described.

図示しない燃料ポンプから燃料入口筒２６に圧送される燃料は，燃料フィルタ４３で濾過された後，弁ハウジング２の内部を満たす。そしてコイル３０を消磁した状態では，弁ばね２２の付勢力で弁組立体Ｖは前方に押圧され，弁体１４を弁座８に着座させている。コイル３０を通電により励磁すると，それにより生ずる磁束がヨーク３１，磁性円筒体４，可動コア１２，固定コア５を順次走り，両コア５，１２間に発生する磁力による吸引力により可動コア１２が弁ばね２２のセット荷重に抗して固定コア５に吸引され，弁体１４が弁座８から離座するので，弁孔７が開放され，弁座部材３内の高圧燃料が弁孔７を出て，インジェクタプレート１０の燃料噴孔１１から，この電磁式燃料噴射弁Ｉを装着した図示しないスロットルボディ又はエンジンの吸気路に噴射される。   Fuel pumped from a fuel pump (not shown) to the fuel inlet cylinder 26 is filtered by the fuel filter 43 and fills the inside of the valve housing 2. When the coil 30 is demagnetized, the valve assembly V is pressed forward by the urging force of the valve spring 22, and the valve body 14 is seated on the valve seat 8. When the coil 30 is energized by energization, the magnetic flux generated by the coil 30 sequentially travels through the yoke 31, the magnetic cylindrical body 4, the movable core 12, and the fixed core 5. The valve core 14 is attracted to the fixed core 5 against the set load of the valve spring 22 and the valve body 14 is separated from the valve seat 8, so that the valve hole 7 is opened and the high-pressure fuel in the valve seat member 3 passes through the valve hole 7. Then, the fuel is injected from a fuel injection hole 11 of the injector plate 10 into a throttle body (not shown) equipped with the electromagnetic fuel injection valve I or an intake passage of an engine.

電磁式燃料噴射弁Ｉの組立工程においては，図４に示すように，弁ハウジング２の外周にコイル組立体２８を嵌装した後，ヨーク３１をコイル組立体２８に，その側方から嵌合して，前ボス部４７を磁性円筒体４の外周面に，また後ボス部４８を固定コア５の外周面にそれぞれ嵌合する。このとき，ボビン２９の後端面より突出した複数の仮止め突起４０が後端壁部４６に圧迫され，その反力により，ヨーク３１は，コイル組立体２８との上記嵌合状態に保持される仮止め状態とされる。したがって，弁ハウジング２，コイル組立体２８及びヨーク３１を次の溶接工程に移す間に，ヨーク３１がコイル組立体２８から脱落することを防ぐことができ，組立性が向上する。   In the assembly process of the electromagnetic fuel injection valve I, as shown in FIG. 4, after the coil assembly 28 is fitted to the outer periphery of the valve housing 2, the yoke 31 is fitted to the coil assembly 28 from the side. Then, the front boss portion 47 is fitted to the outer peripheral surface of the magnetic cylindrical body 4, and the rear boss portion 48 is fitted to the outer peripheral surface of the fixed core 5. At this time, the plurality of temporary fixing protrusions 40 protruding from the rear end surface of the bobbin 29 are pressed against the rear end wall portion 46, and the yoke 31 is held in the above-mentioned fitted state with the coil assembly 28 by the reaction force. Temporarily fixed. Therefore, it is possible to prevent the yoke 31 from dropping from the coil assembly 28 while the valve housing 2, the coil assembly 28 and the yoke 31 are moved to the next welding process, and the assembling property is improved.

しかも弁ハウジング２のコイル組立体２８に対する嵌合荷重は，仮止め突起４０に弾性変形を生じさせるだけの小荷重で足り，その嵌合をスムーズに行うことができる。また仮止め突起４０は，ボビン２９の後端面に，その周方向に沿って複数配列してあるので，弁ハウジング２のコイル組立体２８に対する嵌合姿勢を安定させることができる。   In addition, the fitting load with respect to the coil assembly 28 of the valve housing 2 may be a small load that causes the temporary fixing protrusion 40 to be elastically deformed, and the fitting can be performed smoothly. Further, since the plurality of temporary fixing protrusions 40 are arranged on the rear end surface of the bobbin 29 along the circumferential direction, the fitting posture of the valve housing 2 with respect to the coil assembly 28 can be stabilized.

次の溶接工程では，ヨーク３１の前ボス部４７及び後ボス部４８の各薄肉部４７ａ，４８ａを磁性円筒体４及び固定コア５の各外周面にレーザ溶接する。このような薄肉部４７ａ，４８ａのレーザ溶接によれば，比較的少ない入熱によりヨーク３１を弁ハウジング２に溶接することができる。   In the next welding step, the thin portions 47 a and 48 a of the front boss portion 47 and the rear boss portion 48 of the yoke 31 are laser-welded to the outer peripheral surfaces of the magnetic cylindrical body 4 and the fixed core 5. According to the laser welding of such thin portions 47a and 48a, the yoke 31 can be welded to the valve housing 2 with relatively little heat input.

その後，コイル組立体２８等を埋封する被覆層２７，及び給電端子３３を保持するカプラ３４をモールド成形する。その際，前記仮止め突起４０は，ボビン２９の後端面と，ヨーク３１の前端壁部４５との間に進入する被覆層２７に溶着される。これにより，仮止め突起４０は，被覆層２７に対するアンカ効果を発揮してボビン２９及び被覆層２７の結合力を高め，被覆層２７のコイル組立体２８に対する防水性を向上させることができる。   Thereafter, the coating layer 27 for embedding the coil assembly 28 and the like, and the coupler 34 for holding the power supply terminal 33 are molded. At this time, the temporary fixing protrusion 40 is welded to the covering layer 27 that enters between the rear end surface of the bobbin 29 and the front end wall portion 45 of the yoke 31. Thereby, the temporary fixing protrusion 40 can exhibit an anchor effect with respect to the covering layer 27 to increase the bonding force between the bobbin 29 and the covering layer 27 and improve the waterproof property of the covering layer 27 to the coil assembly 28.

以上，本発明の実施形態について説明したが，本発明はそれに限定されることなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，コイル組立体２８の周囲には，互いに対向する一対のヨーク３１を配置することもできる。また仮止め突起４０は，ボビン２９の前端面に設けることもでき，また前後両端面に設けることもできる。   Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various design changes can be made without departing from the scope of the present invention. For example, a pair of opposing yokes 31 can be disposed around the coil assembly 28. The temporary fixing protrusions 40 can be provided on the front end face of the bobbin 29, or can be provided on both front and rear end faces.

Ｉ・・・・・電磁式燃料噴射弁
２・・・・・弁ハウジング
３・・・・・弁座部材
４・・・・・磁性円筒体
５・・・・・固定コア
６・・・・・非磁性円筒体
１２・・・・可動コア
１４・・・・弁体
２７・・・・被覆層
２８・・・・コイル組立体
２９・・・・ボビン
３１・・・・ヨーク
３４・・・・カプラ
４０・・・・仮止め突起
４４・・・・側壁部
４５・・・・前端壁部
４６・・・・後端壁部 I ... Electromagnetic fuel injection valve 2 ... Valve housing 3 ... Valve seat member 4 ... Magnetic cylinder 5 ... Fixed core 6 ...・ Non-magnetic cylindrical body 12... Movable core 14... Valve body 27 ..covering layer 28... Coil assembly 29. · Coupler 40 ··· Temporary fixing projection 44 ··· Side wall portion 45 · · · Front wall portion 46 · · · Rear wall portion

Claims (3)

弁座部材（３），磁性円筒体（４），非磁性円筒体（６）及び固定コア（５）を前端から後端に向かって順次連ねてなり，内部が燃料流路となる弁ハウジング（２）と，前記固定コア（５）及び非磁性円筒体（６）に亙りそれらの外周に配設されるコイル組立体（２８）と，このコイル組立体（２８）を覆い，コイル組立体（２８）への通電時，前記固定コア（５）及び磁性円筒体（４）間に磁気回路を形成するヨーク（３１）と，前記弁座部材（３）と協働する弁体（１４）と，この弁体（１４）に連結されて前記磁性円筒体（４）内に嵌挿され，前記磁気回路の形成時，前記固定コア（５）に吸引されて前記弁体（１４）を開弁する可動コア（１２）とを備えてなり，前記ヨーク（３１）は，前記コイル組立体（２８）の外周面を覆う側壁部（４４）と，この側壁部（４４）の両端から半径内方に屈曲して前記コイル組立体（２８）の前後両端面に対向し，前記弁ハウジング（２）の外周面に固着される前端壁部（４５）及び後端壁部（４６）とを有する電磁式燃料噴射弁において，
前記コイル組立体（２８）の合成樹脂製のボビン（２９）の前部及び後部の少なくとも一方の端面に，前記ヨーク（３１）を前記コイル組立体（２８）にその側方から嵌合したとき，前記前端壁部（４５）又は前記後端壁部（４６）により圧迫されてヨーク（３１）をコイル組立体（２８）との嵌合位置に保持する仮止め突起（４０）を一体に突設したことを特徴とする電磁式燃料噴射弁。 A valve housing (3), a magnetic cylindrical body (4), a non-magnetic cylindrical body (6), and a fixed core (5) are sequentially connected from the front end to the rear end, and the inside is a fuel flow path ( 2), a coil assembly (28) disposed on the outer periphery of the fixed core (5) and the non-magnetic cylindrical body (6), and the coil assembly (28). 28) When energized, a yoke (31) that forms a magnetic circuit between the fixed core (5) and the magnetic cylinder (4), and a valve body (14) that cooperates with the valve seat member (3) The valve body (14) is connected to and inserted into the magnetic cylindrical body (4), and when the magnetic circuit is formed, the valve body (14) is opened by being attracted by the fixed core (5). And the yoke (31) covers the outer peripheral surface of the coil assembly (28). The portion (44) and the side wall portion (44) are bent radially inward from both ends, face the front and rear end surfaces of the coil assembly (28), and are fixed to the outer peripheral surface of the valve housing (2). In an electromagnetic fuel injection valve having a front end wall (45) and a rear end wall (46),
When the yoke (31) is fitted to the coil assembly (28) from the side of at least one of the front and rear end surfaces of the synthetic resin bobbin (29) of the coil assembly (28). The temporary fixing protrusion (40) which is pressed by the front end wall portion (45) or the rear end wall portion (46) and holds the yoke (31) in a fitting position with the coil assembly (28) is integrally projected. An electromagnetic fuel injection valve characterized by being provided. 請求項１記載の電磁式燃料噴射弁において，
前記ボビン（２９）の前部及び後部の少なくとも一方の端面に，その周方向に沿って前記仮止め突起（４０）を複数配列したことを特徴とする電磁式燃料噴射弁。 The electromagnetic fuel injection valve according to claim 1,
An electromagnetic fuel injection valve, wherein a plurality of the temporary fixing projections (40) are arranged along the circumferential direction on at least one end face of the front and rear portions of the bobbin (29). 請求項１又は２記載の電磁式燃料噴射弁において，
前記コイル組立体（２８）及びヨーク（３１）を埋封しながら，前記コイル組立体（２８）の一側方に突出するカプラ（３４）を形成する合成樹脂製の被覆層（２７）をモールド成形すると共に，この被覆層（２７）に前記仮止め突起（４０）を溶着させたことを特徴とする電磁式燃料噴射弁。 The electromagnetic fuel injection valve according to claim 1 or 2,
A synthetic resin coating layer (27) for forming a coupler (34) protruding to one side of the coil assembly (28) is molded while embedding the coil assembly (28) and the yoke (31). An electromagnetic fuel injection valve characterized in that the temporary fixing protrusion (40) is welded to the coating layer (27) while being molded.
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