JP2021063460A - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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JP2021063460A
JP2021063460A JP2019188319A JP2019188319A JP2021063460A JP 2021063460 A JP2021063460 A JP 2021063460A JP 2019188319 A JP2019188319 A JP 2019188319A JP 2019188319 A JP2019188319 A JP 2019188319A JP 2021063460 A JP2021063460 A JP 2021063460A
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movable core
fuel injection
injection valve
core
needle
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JP7284063B2 (en
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前川　仁之
Hitoshi Maekawa
仁之 前川
友基 藤野
Tomoki Fujino
友基 藤野
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Denso Corp
Soken Inc
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Denso Corp
Soken Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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Abstract

To easily form a damper chamber.SOLUTION: A fuel injection valve 100 includes a cylindrical housing 20 where an injection hole 31 and an internal flow path communicated with the injection hole are formed, a needle 40 having a valve element 41 for opening/closing the injection hole, a movable core 50 for moving the needle, a coil 70 for generating a magnetic field to move the movable core, a fixed core 60 for restricting the movement range of the movable core, and a damper chamber 25 encircled between the housing and the movable core, the movable core being independently slidable, and having a first movable core 51 and a second movable core 54 abutting on each other at a seal part 54s, the first movable core having a first slide part 21a and an end 53s capable of abutting on the second core between the housing and itself, the second movable core having a second slide part 21b whose outer diameter is smaller than the outer diameter of the first slide part, and a second end 55 formed larger than the outer diameter of the second slide part on the first movable core side for closing a fuel passage ranging to a damper chamber when abutting on the first end.SELECTED DRAWING: Figure 1

Description

本開示は、燃料噴射弁に関する。 The present disclosure relates to a fuel injection valve.

例えば、特許文献１には、燃料噴射弁（インジェクタ）が開示されている。この燃料噴射弁は、可動コアの下流側に可動コアとハウジングに囲まれたダンパ室を設け、ダンパ室の圧力を利用して開閉弁時の可動コアの速度を低減して衝突エネルギを低減し、衝突における衝撃を緩和している。 For example, Patent Document 1 discloses a fuel injection valve (injector). This fuel injection valve is provided with a damper chamber surrounded by the movable core and the housing on the downstream side of the movable core, and the pressure of the damper chamber is used to reduce the speed of the movable core at the time of the on-off valve to reduce the collision energy. , The impact in a collision is mitigated.

特開２０１８−１８９００２号公報JP-A-2018-189002

可動コアとハウジングとの間の摺動部におけるクリアランスが小さいと、ハウジングに対して可動コアを摺動できない。一方、クリアランスが大きいと、ダンパ室の密閉性が悪くなるため、ダンパ室による十分なダンパ効果を得られない。そのため、可動コアとハウジングとの間の摺動部におけるクリアランスを適切にしたいという要望がある。特許文献１の燃料噴射弁では、この可動コアとハウジングとの間の摺動部は、ダンパ室の上流側と下流側の２箇所に存在する。この場合、２箇所の摺動部のクリアランスに加え、２箇所の摺動部の相対的な位置も適切にすることが必要となり、加工精度を考慮すると、難しい。 If the clearance in the sliding portion between the movable core and the housing is small, the movable core cannot slide with respect to the housing. On the other hand, if the clearance is large, the airtightness of the damper chamber is deteriorated, so that a sufficient damper effect cannot be obtained by the damper chamber. Therefore, there is a demand for an appropriate clearance in the sliding portion between the movable core and the housing. In the fuel injection valve of Patent Document 1, there are two sliding portions between the movable core and the housing, one on the upstream side and the other on the downstream side of the damper chamber. In this case, in addition to the clearance of the two sliding portions, it is necessary to make the relative positions of the two sliding portions appropriate, which is difficult in consideration of machining accuracy.

本開示は、以下の形態として実現することが可能である。 The present disclosure can be realized in the following forms.

本開示の一形態によれば、燃料噴射弁（１００）が提供される。この燃料噴射弁は、燃料を噴射する噴孔（３１）と内部に前記噴孔に連通する流路（４３）が形成された筒状のハウジング（２０）と、前記ハウジングの内部に設けられ、前記噴孔を開閉する弁体（４１）を有するニードル（４０）と、前記ニードルを移動させる可動コア（５０）と、前記可動コアを前記ニードルの開弁方向に移動させる磁界を発生させるコイル（７０）と、前記可動コアの上流側に設けられ、前記可動コアの移動範囲を規制する固定コア（６０）と、前記ハウジングと、前記可動コアとの間に囲まれたダンパ室（２５）と、を備え、前記可動コアは、互いに独立して摺動可能であり、かつ、シール部（５４ｓ）で互いに当接する第１可動コア（５１）と第２可動コア（５４）とを、前記第１可動コアが、前記固定コア側となるように有し、前記第１可動コアは、前記ハウジングとの間に第１摺動部（２１ａ）と前記第２可動コアと当接可能な端部（５３ｓ）と、を有し、前記第２可動コアは、前記ハウジングとの間に前記第１摺動部の外径よりも小さい外径の第２摺動部（２１ｂ）と、前記第１可動コア側に前記第２摺動部の外径よりも大きく形成され、前記第１端部と接したとき、前記ダンパ室に至る燃料通路を閉塞する第２端部（５５）と、を有する。この形態によれば、第１可動コアと第２可動コアとは別の部材である。そのため、第１摺動部のクリアランスが適切になるように第１可動コアを精度良く加工することができ、第２摺動部のクリアランスが適切になるように第２可動コアを精度良く加工することができ、ダンパ室を容易に形成できる。すなわち、１つの可動コアの２箇所の摺動部を同時に精度良く加工することに比べ、第１可動コアと第２可動コアを別個の部材とするので、ダンパ室に繋がる摺動部のクリアランスを精度良く加工して、ダンパ室を容易に形成できる。 According to one embodiment of the present disclosure, a fuel injection valve (100) is provided. The fuel injection valve is provided in a tubular housing (20) in which a fuel injection hole (31) and a flow path (43) communicating with the injection hole are formed inside, and inside the housing. A needle (40) having a valve body (41) that opens and closes the injection hole, a movable core (50) that moves the needle, and a coil that generates a magnetic field that moves the movable core in the valve opening direction of the needle ( 70), a fixed core (60) provided on the upstream side of the movable core and restricting the movement range of the movable core, and a damper chamber (25) surrounded between the housing and the movable core. The first movable core (51) and the second movable core (54), which are slidable independently of each other and are in contact with each other at the seal portion (54s), are provided with the first movable core (54). The 1 movable core is provided so as to be on the fixed core side, and the first movable core is an end portion capable of contacting the first sliding portion (21a) with the housing and the second movable core. The second movable core has a second sliding portion (21b) having an outer diameter smaller than the outer diameter of the first sliding portion and the first sliding portion (21b) with the housing. It has a second end portion (55) formed on the movable core side, which is larger than the outer diameter of the second sliding portion and closes the fuel passage leading to the damper chamber when in contact with the first end portion. .. According to this form, the first movable core and the second movable core are separate members. Therefore, the first movable core can be processed with high accuracy so that the clearance of the first sliding portion becomes appropriate, and the second movable core can be processed with high accuracy so that the clearance of the second sliding portion becomes appropriate. And the damper chamber can be easily formed. That is, compared to processing two sliding parts of one movable core at the same time with high accuracy, since the first movable core and the second movable core are separate members, the clearance of the sliding parts connected to the damper chamber can be increased. It can be processed with high precision to easily form a damper chamber.

本開示は、燃料噴射弁以外の種々の形態で実現することも可能である。例えば、燃料噴射装置や、燃料噴射方法等の形態で実現することができる。 The present disclosure can also be realized in various forms other than the fuel injection valve. For example, it can be realized in the form of a fuel injection device, a fuel injection method, or the like.

燃料噴射弁の概略構成図である。It is a schematic block diagram of a fuel injection valve. ダンパ室近傍の拡大図である。It is an enlarged view of the vicinity of a damper room.

・第１実施形態：
図１に示すように、燃料噴射弁１００は、ハウジング２０と、噴射ノズル３０と、ニードル４０と、可動コア５０と、固定コア６０と、コイル７０と、第１スプリング８１と、第２スプリング８２と、を備える。燃料噴射弁１００は、燃料を噴射するための装置である。本実施形態の燃料噴射弁１００は、流体、特に燃料として気体の燃料ガス、例えばＬＮＧ、ＬＰＧ、水素などを噴射するのに用いられる。 -First embodiment:
As shown in FIG. 1, the fuel injection valve 100 includes a housing 20, an injection nozzle 30, a needle 40, a movable core 50, a fixed core 60, a coil 70, a first spring 81, and a second spring 82. And. The fuel injection valve 100 is a device for injecting fuel. The fuel injection valve 100 of the present embodiment is used to inject a fluid, particularly a gaseous fuel gas as a fuel, such as LNG, LPG, or hydrogen.

ハウジング２０は、燃料を噴射する噴射ノズル３０に連通する燃料流路が形成された筒状の部材である。ハウジング２０は、下流側から第１筒部材２１、第２筒部材２２、第３筒部材２３、第４筒部材２４を備える。第１筒部材２１は、マルテンサイト系ステンレス鋼により形成され、所定の硬度を有するよう焼入れ処理が施されている。第１筒部材２１の下流側端部には、噴射ノズル３０が設けられている。噴射ノズル３０は、噴孔３１と、弁座３２と、を備える。噴射ノズル３０は、マルテンサイト系ステンレス鋼により形成されている。 The housing 20 is a tubular member having a fuel flow path that communicates with an injection nozzle 30 that injects fuel. The housing 20 includes a first cylinder member 21, a second cylinder member 22, a third cylinder member 23, and a fourth cylinder member 24 from the downstream side. The first cylinder member 21 is made of martensitic stainless steel and is subjected to a quenching treatment so as to have a predetermined hardness. An injection nozzle 30 is provided at the downstream end of the first cylinder member 21. The injection nozzle 30 includes an injection hole 31 and a valve seat 32. The injection nozzle 30 is made of martensitic stainless steel.

第２筒部材２２は、第４筒部材２４は、磁性材料、例えばフェライト系ステンレス鋼で形成されている。第２筒部材２２の内径は、第１筒部材２１の内径よりも小さい。第３筒部材２３は、非磁性材料、例えば、オーステナイト系ステンレス鋼により形成されている。 In the second cylinder member 22, the fourth cylinder member 24 is made of a magnetic material, for example, ferritic stainless steel. The inner diameter of the second cylinder member 22 is smaller than the inner diameter of the first cylinder member 21. The third tubular member 23 is made of a non-magnetic material, for example, austenitic stainless steel.

第４筒部材２４の端部には、略円筒状の燃料導入パイプ１２が溶接等により固定されている。燃料導入パイプ１２の内側には、フィルタ１３が設けられている。フィルタ１３は、燃料導入パイプ１２の導入口１４から流入した燃料の中の異物を捕集する。 A substantially cylindrical fuel introduction pipe 12 is fixed to the end of the fourth tubular member 24 by welding or the like. A filter 13 is provided inside the fuel introduction pipe 12. The filter 13 collects foreign matter in the fuel that has flowed in from the introduction port 14 of the fuel introduction pipe 12.

燃料導入パイプ１２および第４筒部材２４の外側は、樹脂によりモールドされている。当該モールド部分にコネクタ１５が形成されている。コネクタ１５には、後述するコイル７０へ電力を供給するための端子１６がインサート成形されている。また、コイル７０の外側には、コイル７０を覆うようにして筒状のホルダ１７が設けられている。第４筒部材２４とホルダ１７の間には略ドーナツ円板状のカバー１８が設けられている。ホルダ１７とカバー１８は、磁性体から形成され、後述する磁気回路φの一部を形成する。 The outside of the fuel introduction pipe 12 and the fourth cylinder member 24 is molded with resin. A connector 15 is formed on the mold portion. The connector 15 is insert-molded with terminals 16 for supplying electric power to the coil 70, which will be described later. Further, on the outside of the coil 70, a tubular holder 17 is provided so as to cover the coil 70. A donut disk-shaped cover 18 is provided between the fourth tubular member 24 and the holder 17. The holder 17 and the cover 18 are formed of a magnetic material and form a part of a magnetic circuit φ described later.

ニードル４０は、噴孔３１を開閉する部材であり、第１筒部材２１、第２筒部材２２の内部に配置された棒状の部材である。ニードル４０は、下流側端部に、弁座３２と当接可能な弁体４１を備え、上流側端部に大径部４２を有する。ニードル４０の弁体４１よりも少し上流側には、外側に向けて突出する摺接部４６がニードル４０の週報項に沿って複数個形成されている。摺接部４６は、その先端を第１筒部材２１の内周面に当接させた状態で摺動する。隣り合う摺接部４６の間には、燃料が通過可能な凹部４７が形成されている。ニードル４０は、非磁性材料であるマルテンサイト系ステンレス鋼によって形成されている。ニードル４０の内部には、上流側からニードル４０のほぼ中央まで、燃料流路４３が形成されている。燃料流路４３の下流側には、ニードル４０内外を連通する連通孔４４が設けられている。連通孔４４は、ニードル４０の内部の燃料流路４３と、ニードル４０と第１筒部材２１との間の燃料流路４５とを連通している。燃料流路４５の下流側は、噴射ノズル３０まで至っている。 The needle 40 is a member that opens and closes the injection hole 31, and is a rod-shaped member arranged inside the first cylinder member 21 and the second cylinder member 22. The needle 40 is provided with a valve body 41 capable of contacting the valve seat 32 at the downstream end, and has a large diameter portion 42 at the upstream end. A plurality of sliding contact portions 46 projecting outward are formed on the slightly upstream side of the valve body 41 of the needle 40 along the weekly report of the needle 40. The sliding contact portion 46 slides in a state where its tip is in contact with the inner peripheral surface of the first tubular member 21. A recess 47 through which fuel can pass is formed between the adjacent sliding contact portions 46. The needle 40 is made of martensitic stainless steel, which is a non-magnetic material. Inside the needle 40, a fuel flow path 43 is formed from the upstream side to substantially the center of the needle 40. A communication hole 44 that communicates inside and outside the needle 40 is provided on the downstream side of the fuel flow path 43. The communication hole 44 communicates the fuel flow path 43 inside the needle 40 with the fuel flow path 45 between the needle 40 and the first cylinder member 21. The downstream side of the fuel flow path 45 reaches the injection nozzle 30.

ハウジング２０の内側には可動コア５０が摺動可能に設けられている。可動コア５０は、コイル７０からの磁界を受けて、ニードル４０を開弁方向に移動させる部材である。可動コア５０は、互いに独立して摺動可能である上流側の第１可動コア５１と、下流側の第２可動コア５４とから構成されている。さらに、第１可動コア５１は、第１可動コアアッパ部５２と第１可動コアロア部５３とから構成されている。第２可動コア５４は、第１可動コアロア部５３の下流側に設けられている。第１可動コアアッパ部５２は磁性体であるフェライト系ステンレス鋼により形成されている。第１可動コアアッパ部５２は、後述するコイル７０に電力が印加されると、コイル７０が発生させる磁界により力を受けて上流側に移動する。第１可動コアロア部５３と、第２可動コア５４はマルテンサイト系ステンレス鋼により形成され、所定の硬度を有するよう焼入れ処理が施されている。第１可動コアアッパ部５２と第１可動コアロア部５３とは、圧入、溶接等により一体に固定されている。可動コア５０の内側には、ニードル４０が挿通されている。第１可動コア５１の内径は、ニードル４０の大径部４２の外径よりも小さく、第１可動コア５１の上流側の面は、大径部４２と当接可能となっている。なお、第１可動コアアッパ部５２と第１可動コアロア部５３とは、同一の部材としてもよい。 A movable core 50 is slidably provided inside the housing 20. The movable core 50 is a member that receives a magnetic field from the coil 70 and moves the needle 40 in the valve opening direction. The movable core 50 is composed of a first movable core 51 on the upstream side and a second movable core 54 on the downstream side, which are slidable independently of each other. Further, the first movable core 51 is composed of a first movable core upper portion 52 and a first movable core lower portion 53. The second movable core 54 is provided on the downstream side of the first movable core lower portion 53. The first movable core upper portion 52 is made of ferritic stainless steel, which is a magnetic material. When electric power is applied to the coil 70, which will be described later, the first movable core upper portion 52 receives a force from the magnetic field generated by the coil 70 and moves to the upstream side. The first movable core lower portion 53 and the second movable core 54 are made of martensitic stainless steel and are subjected to a quenching treatment so as to have a predetermined hardness. The first movable core upper portion 52 and the first movable core lower portion 53 are integrally fixed by press fitting, welding, or the like. A needle 40 is inserted inside the movable core 50. The inner diameter of the first movable core 51 is smaller than the outer diameter of the large diameter portion 42 of the needle 40, and the surface on the upstream side of the first movable core 51 can come into contact with the large diameter portion 42. The first movable core upper portion 52 and the first movable core lower portion 53 may be the same member.

第１可動コアロア部５３と第１筒部材２１との間には、第１摺動部２１ａが形成されており、第２可動コア５４と第１筒部材２１との間には、第２摺動部２１ｂが形成されている。第２摺動部２１ｂの外径は、第１摺動部２１ａの外径よりも小さい。第１可動コアロア部５３は、第２可動コア５４側に、第２可動コア５４と当接可能な第１端部５３ｓを有し、第２可動コア５４の第１可動コアロア部５３側に第２端部５５を有している。第２端部５５の外径は、第２摺動部２１ｂの外径よりも大きく、第１摺動部２１ａの外径よりも小さい。第１摺動部２１ａと第２摺動部２１ｂの間には、第１筒部材２１、第１可動コアロア部５３、第２可動コア５４により囲まれたダンパ室２５が形成されている。第１可動コアロア部５３と第１摺動部２１ａ、第２可動コア５４と第２摺動部２１ｂの間のクリアランスは、いずれも数μｍ〜数十μｍであり、また第１可動コアロア部５３と第２可動コア５４は第１摺動部２１ａ、第２摺動部２１ｂでシールされている。第１端部５３ｓと第２端部５５とが接すると、ダンパ室に至る燃料通路が閉塞される。その結果、ダンパ室２５とその他の燃料流路との間の燃料の出入りは制限され、ダンパ室２５は準密閉状態となっている。 A first sliding portion 21a is formed between the first movable core lower portion 53 and the first cylinder member 21, and a second sliding portion 21a is formed between the second movable core 54 and the first cylinder member 21. The moving portion 21b is formed. The outer diameter of the second sliding portion 21b is smaller than the outer diameter of the first sliding portion 21a. The first movable core lower portion 53 has a first end portion 53s that can come into contact with the second movable core 54 on the second movable core 54 side, and has a first movable core lower portion 53 side of the second movable core 54 on the first movable core lower portion 53 side. It has two ends 55. The outer diameter of the second end portion 55 is larger than the outer diameter of the second sliding portion 21b and smaller than the outer diameter of the first sliding portion 21a. A damper chamber 25 surrounded by a first cylinder member 21, a first movable core lower portion 53, and a second movable core 54 is formed between the first sliding portion 21a and the second sliding portion 21b. The clearances between the first movable core lower portion 53 and the first sliding portion 21a, and between the second movable core 54 and the second sliding portion 21b are all several μm to several tens of μm, and the first movable core lower portion 53. And the second movable core 54 are sealed by the first sliding portion 21a and the second sliding portion 21b. When the first end portion 53s and the second end portion 55 come into contact with each other, the fuel passage leading to the damper chamber is blocked. As a result, the inflow and outflow of fuel between the damper chamber 25 and other fuel flow paths is restricted, and the damper chamber 25 is in a semi-sealed state.

固定コア６０は、可動コア５０の上流側に設けられ、磁界により開弁方向に移動する可動コア５０の移動範囲を規制する部材である。固定コア６０は、磁性体であるフェライト系ステンレス鋼により形成される第１固定コア部材６１と、マルテンサイト系ステンレス鋼により形成され、所定の硬度を有するよう焼入れ処理が施された第２固定コア部材６２を備える。第１固定コア部材６１と第２固定コア部材６２は、例えば、圧入により固定されている。固定コア６０は中空の略円筒状に形成されており、ハウジング２０の内側に固定されている。具体的には、固定コア６０は、ハウジング２０の第４筒部材２４に溶接等により固定されている。また、固定コア６０の内側には、ニードル４０の大径部４２が摺動可能に挿通されている。 The fixed core 60 is a member provided on the upstream side of the movable core 50 and regulates the moving range of the movable core 50 that moves in the valve opening direction by a magnetic field. The fixed core 60 is a first fixed core member 61 made of ferritic stainless steel, which is a magnetic material, and a second fixed core formed of martensitic stainless steel and hardened so as to have a predetermined hardness. A member 62 is provided. The first fixed core member 61 and the second fixed core member 62 are fixed by, for example, press fitting. The fixed core 60 is formed in a hollow substantially cylindrical shape and is fixed to the inside of the housing 20. Specifically, the fixed core 60 is fixed to the fourth cylinder member 24 of the housing 20 by welding or the like. Further, a large diameter portion 42 of the needle 40 is slidably inserted inside the fixed core 60.

コイル７０は、ボビン７１に巻かれており、電力が供給（通電）されると磁界を生じる。コイル７０に磁界が生じると、第１固定コア部材６１、第１可動コアアッパ部５２、第２筒部材２２、第４筒部材２４、ホルダ１７、およびカバー１８を通る閉じた磁気回路φが形成される。これにより、第１固定コア部材６１と第１可動コアアッパ部５２との間に吸引力が発生し、第１可動コアアッパ部５２は第１固定コア部材６１に吸引される。このとき可動コア５０の上流側の端面はニードル４０の大径部４２に当接し、ニードル４０を上流側に移動させる。すなわち、ニードル４０は可動コア５０とともに開弁方向へ移動する。これにより、弁体４１は弁座３２から離座し、噴孔３１が開口し、燃料が噴射可能となる。 The coil 70 is wound around a bobbin 71 and generates a magnetic field when electric power is supplied (energized). When a magnetic field is generated in the coil 70, a closed magnetic circuit φ passing through the first fixed core member 61, the first movable core upper portion 52, the second cylinder member 22, the fourth cylinder member 24, the holder 17, and the cover 18 is formed. To. As a result, a suction force is generated between the first fixed core member 61 and the first movable core upper portion 52, and the first movable core upper portion 52 is attracted to the first fixed core member 61. At this time, the end face on the upstream side of the movable core 50 abuts on the large diameter portion 42 of the needle 40, and the needle 40 is moved to the upstream side. That is, the needle 40 moves in the valve opening direction together with the movable core 50. As a result, the valve body 41 is separated from the valve seat 32, the injection hole 31 is opened, and fuel can be injected.

第１スプリング８１は、下流側の端部がニードル４０の大径部４２の端部に当接し、上流側の端部が固定コア６０の内側に圧入固定された中空のアジャスティングパイプ１１の一端に当接している。第１スプリング８１は、大径部４２を図の下方に押すことで、ニードル４０を閉弁方向に押さえる。ニードル４０の大径部４２が、第１可動コアロア部５３を閉弁方向（図の下方）に押し、第１可動コアロア部５３が第２可動コア５４を閉弁方向（図の下方）に押すことで、可動コア５０は、により閉弁方向に押さえられる。 One end of the hollow adjusting pipe 11 whose downstream end abuts on the end of the large diameter portion 42 of the needle 40 and whose upstream end is press-fitted and fixed inside the fixed core 60. Is in contact with. The first spring 81 pushes the large diameter portion 42 downward in the drawing to hold the needle 40 in the valve closing direction. The large diameter portion 42 of the needle 40 pushes the first movable core lower portion 53 in the valve closing direction (lower part of the figure), and the first movable core lower portion 53 pushes the second movable core 54 in the valve closing direction (lower part of the figure). As a result, the movable core 50 is pressed in the valve closing direction by.

第２スプリング８２は、上流側の端部が可動コア５０の端面に当接し、下流側の端部はハウジング２０の第１筒部材２１の内側に設けられた段差面に当接している。第２スプリング８２は、第２可動コア５４を開弁方向（図の上方）に押し、第２可動コア５４は第１可動コアロア部５３を開弁方向（図の上方）に押している。第１可動コアロア部５３の上流側の面は、ニードル４０の大径部４２と当接しているので、ニードル４０を開弁方向に押さえつける。ニードル４０と可動コア５０には、第１スプリング８１による閉弁方向の付勢力と、第２スプリング８２による開弁方向の付勢力とが掛かる。ここで、本実施例では、第１スプリング８１の付勢力は、第２スプリング８２の付勢力よりも大きく設定されている。そのため、コイル７０に電力が供給（通電）されていない状態では、ニードル４０の弁体４１は、弁座３２に着座した状態、すなわち閉弁状態となる。 The upstream end of the second spring 82 is in contact with the end surface of the movable core 50, and the downstream end is in contact with the stepped surface provided inside the first tubular member 21 of the housing 20. The second spring 82 pushes the second movable core 54 in the valve opening direction (upper part of the figure), and the second movable core 54 pushes the first movable core lower portion 53 in the valve opening direction (upper part of the figure). Since the upstream surface of the first movable core lower portion 53 is in contact with the large diameter portion 42 of the needle 40, the needle 40 is pressed in the valve opening direction. The needle 40 and the movable core 50 are subjected to an urging force in the valve closing direction by the first spring 81 and an urging force in the valve opening direction by the second spring 82. Here, in this embodiment, the urging force of the first spring 81 is set to be larger than the urging force of the second spring 82. Therefore, in a state where electric power is not supplied (energized) to the coil 70, the valve body 41 of the needle 40 is in a state of being seated on the valve seat 32, that is, in a valve closed state.

以下、燃料噴射弁１００の動作について説明する。コイル７０に電力が供給されると、上述したように、第１固定コア部材６１、第１可動コアアッパ部５２、第２筒部材２２、第４筒部材２４、ホルダ１７、およびカバー１８を通る閉じた磁気回路φが形成され、第１固定コア部材６１と第１可動コアアッパ部５２との間に吸引力が発生し、第１可動コアアッパ部５２は第１固定コア部材６１に吸引される。 Hereinafter, the operation of the fuel injection valve 100 will be described. When power is supplied to the coil 70, as described above, the coil 70 is closed through the first fixed core member 61, the first movable core upper portion 52, the second cylinder member 22, the fourth cylinder member 24, the holder 17, and the cover 18. A magnetic circuit φ is formed, an attractive force is generated between the first fixed core member 61 and the first movable core upper portion 52, and the first movable core upper portion 52 is attracted to the first fixed core member 61.

可動コア５０の上流側の面は、大径部４２と当接しているので、ニードル４０を上流側に移動させる。その結果、ニードル４０の弁体４１が、弁座３２から離座し、噴孔３１が開く。燃料導入パイプ１２の導入口１４から流入した燃料は、中空のアジャスティングパイプ１１の中、固定コア６０の中を経て、ニードル４０の内部の燃料流路４３、連通孔４４、ニードル４０と第１筒部材２１との間の燃料流路４５を通り、噴孔３１に導かれ、噴射される。 Since the surface on the upstream side of the movable core 50 is in contact with the large diameter portion 42, the needle 40 is moved to the upstream side. As a result, the valve body 41 of the needle 40 is separated from the valve seat 32, and the injection hole 31 is opened. The fuel flowing in from the introduction port 14 of the fuel introduction pipe 12 passes through the hollow adjusting pipe 11, the fixed core 60, the fuel flow path 43 inside the needle 40, the communication hole 44, the needle 40, and the first. It is guided to the injection hole 31 through the fuel flow path 45 between the cylinder member 21 and injected.

可動コア５０が開弁動作により、開弁方向（図１の上方）に移動するとダンパ室２５の容積は拡大し、ダンパ室２５内の燃料の圧力が低下する。ダンパ室２５内の燃料の圧力が低下すると、第１可動コアロア部５３には閉弁方向（図１の下方）に向かう力が働く。その結果、第１可動コア５１の開弁方向への移動速度は緩和され、第１可動コア５１、すなわち可動コア５０が固定コア６０に衝突する際のエネルギを低減する。 When the movable core 50 moves in the valve opening direction (upper in FIG. 1) due to the valve opening operation, the volume of the damper chamber 25 increases and the pressure of the fuel in the damper chamber 25 decreases. When the pressure of the fuel in the damper chamber 25 decreases, a force acts on the first movable core lower portion 53 in the valve closing direction (lower part in FIG. 1). As a result, the moving speed of the first movable core 51 in the valve opening direction is relaxed, and the energy when the first movable core 51, that is, the movable core 50 collides with the fixed core 60 is reduced.

逆に、可動コア５０が閉弁動作により図１の下方に移動するとダンパ室２５の容積は縮小し、ダンパ室２５内の燃料の圧力は上昇する。ダンパ室２５内の燃料の圧力が上昇することにより、第１可動コアロア部５３には開弁方向（図１の上方）に向かう力が働く。第１可動コアロア部５３は、上流側で、ニードル４０の大径部４２と接するため、ニードル４０には開弁方向（図１の上方）に向かって力が働く。その結果、可動コア５０およびニードル４０の閉弁方向への移動速度は緩和する。その結果、ニードル４０の弁体４１が噴射ノズル３０の弁座３２に衝突する際のエネルギを低減する。 On the contrary, when the movable core 50 moves downward in FIG. 1 due to the valve closing operation, the volume of the damper chamber 25 is reduced and the fuel pressure in the damper chamber 25 is increased. As the pressure of the fuel in the damper chamber 25 rises, a force acts on the first movable core lower portion 53 in the valve opening direction (upper in FIG. 1). Since the first movable core lower portion 53 is in contact with the large diameter portion 42 of the needle 40 on the upstream side, a force acts on the needle 40 in the valve opening direction (upper in FIG. 1). As a result, the moving speeds of the movable core 50 and the needle 40 in the valve closing direction are relaxed. As a result, the energy when the valve body 41 of the needle 40 collides with the valve seat 32 of the injection nozzle 30 is reduced.

第１摺動部２１ａあるいは、第２摺動部２１ｂにおけるクリアランスが狭すぎれば、可動コア５０が移動できない。一方、クリアランスが大きすぎれば、ダンパ室２５を準密閉状態にできないため、可動コア５０の移動速度を緩和できない。ここで、可動コア５０の第１可動コア５１と、第２可動コア５４とが１個の部材で形成されている場合、第１摺動部２１ａにおける可動コア５０の外径とハウジング２０の内径との間のクリアランス、第２摺動部２１ｂにおける可動コア５０の外径とハウジング２０の内径との間のクリアランス、をそれぞれ高精度に形成するだけでなく、第１摺動部２１ａにおける可動コア５０の外周位置と第２摺動部２１ｂにおける可動コア５０の外周位置について、高精度に加工する必要があった。これは、第１摺動部２１ａと第２摺動部２１ｂの相対的位置が自由でないためである。これに対し、本実施形態では、可動コア５０の第１可動コア５１と、第２可動コア５４とに分離されているため、第１摺動部２１ａと第２摺動部２１ｂの相対的位置が自由となる。その結果、第１摺動部２１ａにおける可動コア５０の外径とハウジング２０の内径との間のクリアランス、第２摺動部２１ｂにおける可動コア５０の外径とハウジング２０の内径との間のクリアランスを高精度に形成すればよい。すなわち、第１可動コア５１については、第１摺動部２１ａの加工精度のみを考慮すれば良く、第２可動コア５４については、第２摺動部２１ｂの加工精度のみを考慮すれば良い。 If the clearance in the first sliding portion 21a or the second sliding portion 21b is too narrow, the movable core 50 cannot move. On the other hand, if the clearance is too large, the damper chamber 25 cannot be placed in a semi-sealed state, so that the moving speed of the movable core 50 cannot be relaxed. Here, when the first movable core 51 of the movable core 50 and the second movable core 54 are formed of one member, the outer diameter of the movable core 50 and the inner diameter of the housing 20 in the first sliding portion 21a are formed. Not only is the clearance between the two and the outer diameter of the movable core 50 in the second sliding portion 21b and the clearance between the inner diameter of the housing 20 formed with high precision, but also the movable core in the first sliding portion 21a is formed. It was necessary to process the outer peripheral position of the movable core 50 and the outer peripheral position of the movable core 50 in the second sliding portion 21b with high accuracy. This is because the relative positions of the first sliding portion 21a and the second sliding portion 21b are not free. On the other hand, in the present embodiment, since the first movable core 51 of the movable core 50 and the second movable core 54 are separated, the relative positions of the first sliding portion 21a and the second sliding portion 21b Becomes free. As a result, the clearance between the outer diameter of the movable core 50 and the inner diameter of the housing 20 in the first sliding portion 21a and the clearance between the outer diameter of the movable core 50 and the inner diameter of the housing 20 in the second sliding portion 21b. Should be formed with high precision. That is, for the first movable core 51, only the machining accuracy of the first sliding portion 21a needs to be considered, and for the second movable core 54, only the machining accuracy of the second sliding portion 21b needs to be considered.

図２は、ダンパ室２５近傍の拡大図であり、可動コア５０が少し開弁方向に移動した状態を示す。本実施形態では、図２に示すように第２可動コア５４は、第２端部５５に第１可動コアロア部５３に向けて突き出る凸部５４ｃを有し、凸部５４ｃと第１可動コアロア部５３との間にシール部５４ｓを形成している。第１可動コアロア部５３と第２可動コア５４のシール部５４ｓの最内径Ｄ２を第２摺動部２１ｂの外径Ｄ１より大きくしている。すなわち、シール部５４ｓは、第２摺動部２１ｂより径方向の外側に位置する。 FIG. 2 is an enlarged view of the vicinity of the damper chamber 25, showing a state in which the movable core 50 is slightly moved in the valve opening direction. In the present embodiment, as shown in FIG. 2, the second movable core 54 has a convex portion 54c protruding toward the first movable core lower portion 53 at the second end portion 55, and the convex portion 54c and the first movable core lower portion. A seal portion 54s is formed between the seal portion 54s and the portion 53. The innermost diameter D2 of the seal portion 54s of the first movable core lower portion 53 and the second movable core 54 is made larger than the outer diameter D1 of the second sliding portion 21b. That is, the seal portion 54s is located outside the second sliding portion 21b in the radial direction.

開弁時には、可動コア５０は、図２の上方に移動し、既に説明為たように、ダンパ室２５内の燃料圧力が低下する。このように、本実施形態では、凸部５４ｃを有する第２端部５５を備え、凸部５４ｃと第１端部５３ｓとのシール部５４ｓの最内径Ｄ２を、第２摺動部２１ｂの外径Ｄ１より大きくしている。本実施形態では、シール部５４ｓの最内径Ｄ２は、第２摺動部２１ｂの外径Ｄ１より大きいので、シール部５４ｓより内側の面積に比例する第２可動コア５４に掛かる下向きの圧力により、第１可動コアロア部５３と第２可動コア５４との間にお互いを引き離す方向に力がはたらく。第１可動コアロア部５３と第２可動コア５４との間が引き離されると、ダンパ室２５に外部から燃料が流入する。燃料が流入することによりダンパ室２５内の燃料圧力は上昇し、再び第１可動コアロア部５３と第２可動コア５４は当接する。これにより、ダンパ室２５内の燃料圧力が所定値以下になることを防止し、開弁時のダンパ効果に上限を設定することが可能となる。 When the valve is opened, the movable core 50 moves upward in FIG. 2, and as described above, the fuel pressure in the damper chamber 25 decreases. As described above, in the present embodiment, the second end portion 55 having the convex portion 54c is provided, and the innermost diameter D2 of the sealing portion 54s between the convex portion 54c and the first end portion 53s is set outside the second sliding portion 21b. It is larger than the diameter D1. In the present embodiment, the innermost diameter D2 of the seal portion 54s is larger than the outer diameter D1 of the second sliding portion 21b, so that the downward pressure applied to the second movable core 54 proportional to the area inside the seal portion 54s causes. A force acts between the first movable core lower portion 53 and the second movable core 54 in a direction in which they are separated from each other. When the first movable core lower portion 53 and the second movable core 54 are separated from each other, fuel flows into the damper chamber 25 from the outside. As the fuel flows in, the fuel pressure in the damper chamber 25 rises, and the first movable core lower portion 53 and the second movable core 54 come into contact with each other again. As a result, it is possible to prevent the fuel pressure in the damper chamber 25 from falling below a predetermined value and set an upper limit on the damper effect when the valve is opened.

一方、閉弁動作時には、可動コア５０は、図２の下方に移動し、ダンパ室２５内の燃料圧力が上昇すると、第１可動コアロア部５３と第２可動コア５４との間にお互いを押し付ける方向に力がはたらき、第１可動コアロア部５３と第２可動コア５４の間のシール部５４ｓにおけるシール性を向上できる。その結果、ダンパ室２５によるダンパ効果を大きくできる。 On the other hand, during the valve closing operation, the movable core 50 moves downward in FIG. 2, and when the fuel pressure in the damper chamber 25 rises, the movable core 50 presses against each other between the first movable core lower portion 53 and the second movable core 54. A force acts in the direction, and the sealing property in the sealing portion 54s between the first movable core lower portion 53 and the second movable core 54 can be improved. As a result, the damper effect of the damper chamber 25 can be increased.

以上、説明したように、第１可動コアロア部５３と第２可動コア５４のシール部５４ｓの最内径Ｄ２を第２摺動部２１ｂの外径Ｄ１より大きくすることで、ダンパ室２５内の燃料圧力が所定値以下になることを防止し、開弁時のダンパ効果に上限を設定することが可能となる。 As described above, by making the innermost diameter D2 of the seal portion 54s of the first movable core lower portion 53 and the second movable core 54 larger than the outer diameter D1 of the second sliding portion 21b, the fuel in the damper chamber 25 is fueled. It is possible to prevent the pressure from falling below a predetermined value and set an upper limit on the damper effect when the valve is opened.

上記説明では、第２可動コア５４は、第１可動コアロア部５３に向けて突き出る凸部５４ｃを有する構造としたが、第１可動コアロア部５３が、第２可動コア５４に向けて突き出る凸部を有している構成であってもよい。また、第１可動コアロア部５３と第２可動コア５４の一方が凸部を備え、他方が平坦であってもよく、一方が凸部を備え、他方が凸部に対応した凹部を備える構成であってもよい。 In the above description, the second movable core 54 has a structure having a convex portion 54c protruding toward the first movable core lower portion 53, but the first movable core lower portion 53 has a convex portion protruding toward the second movable core 54. It may be a configuration having. Further, one of the first movable core lower portion 53 and the second movable core 54 may have a convex portion and the other may be flat, and one has a convex portion and the other has a concave portion corresponding to the convex portion. There may be.

上記実施形態では、ダンパ室２５を第１可動コアロア部５３の下流側に設けたが、上流側に設けても良い。 In the above embodiment, the damper chamber 25 is provided on the downstream side of the first movable core lower portion 53, but it may be provided on the upstream side.

上記実施形態では、燃料噴射弁１００は、気体の燃料、水素を噴射するものとしたが、水素以外の気体や液体を噴射する燃料噴射弁であってもよい。 In the above embodiment, the fuel injection valve 100 is intended to inject gaseous fuel or hydrogen, but it may be a fuel injection valve that injects a gas or liquid other than hydrogen.

上記実施形態では、第１可動コアロア部５３の第１端部５３ｓと、第１可動コアロア部５３のダンパ室２５側の面とは、段差を有しているが、第１端部５３ｓとの第１可動コアロア部５３のダンパ室２５側の面とは、平坦であってもよい。 In the above embodiment, the first end portion 53s of the first movable core lower portion 53 and the surface of the first movable core lower portion 53 on the damper chamber 25 side have a step, but the first end portion 53s is used. The surface of the first movable core lower portion 53 on the damper chamber 25 side may be flat.

上記実施形態では、第１筒部材２１は、内側に段差を有することで、第１摺動部２１ａと第２摺動部２１ｂを形成しているが、第１筒部材２１の内側を段差の無い形状とし、第１筒部材２１の内側に別部材を挿入し、別部材の内側に第２摺動部形成してもよい。 In the above embodiment, the first cylinder member 21 has a step on the inside to form the first sliding portion 21a and the second sliding portion 21b, but the inside of the first cylinder member 21 has a step. The shape may not be provided, and another member may be inserted inside the first cylinder member 21 to form a second sliding portion inside the other member.

本開示は、上述の実施形態に限られるものではなく、その趣旨を逸脱しない範囲において種々の構成で実現することができる。例えば、実施形態中の技術的特徴は、上述の課題の一部又は全部を解決するために、あるいは、上述の効果の一部又は全部を達成するために、適宜、差し替えや、組み合わせを行うことが可能である。また、その技術的特徴が本明細書中に必須なものとして説明されていなければ、適宜、削除することが可能である。 The present disclosure is not limited to the above-described embodiment, and can be realized by various configurations within a range not deviating from the gist thereof. For example, the technical features in the embodiments may be replaced or combined as appropriate to solve some or all of the above-mentioned problems, or to achieve some or all of the above-mentioned effects. Is possible. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

１１…アジャスティングパイプ、１２…燃料導入パイプ、１３…フィルタ、１４…導入口、１５…コネクタ、１６…端子、１７…ホルダ、１８…カバー、２０…ハウジング、２１…第１筒部材、２１ａ…第１摺動部、２１ｂ…第２摺動部、２２…第２筒部材、２３…第３筒部材、２４…第４筒部材、２５…ダンパ室、３０…噴射ノズル、３１…噴孔、３２…弁座、４０…ニードル、４１…弁体、４２…大径部、４３…燃料流路、４４…連通孔、４５…燃料流路、４６…摺接部、４７…凹部、５０…可動コア、５１…第１可動コア、５２…第１可動コアアッパ部、５３…第１可動コアロア部、５３ｓ…第１端部、５４…第２可動コア、５４ｃ…凸部、５４ｓ…シール部、５５…第２端部、６０…固定コア、６１…第１固定コア部材、６２…第２固定コア部材、７０…コイル、７１…ボビン、８１…第１スプリング、８２…第２スプリング、１００…燃料噴射弁 11 ... Adjusting pipe, 12 ... Fuel introduction pipe, 13 ... Filter, 14 ... Introduction port, 15 ... Connector, 16 ... Terminal, 17 ... Holder, 18 ... Cover, 20 ... Housing, 21 ... First cylinder member, 21a ... 1st sliding part, 21b ... 2nd sliding part, 22 ... 2nd cylinder member, 23 ... 3rd cylinder member, 24 ... 4th cylinder member, 25 ... damper chamber, 30 ... injection nozzle, 31 ... injection hole, 32 ... Valve seat, 40 ... Needle, 41 ... Valve body, 42 ... Large diameter part, 43 ... Fuel flow path, 44 ... Communication hole, 45 ... Fuel flow path, 46 ... Sliding contact part, 47 ... Recessed part, 50 ... Movable Core, 51 ... 1st movable core, 52 ... 1st movable core upper part, 53 ... 1st movable core lower part, 53s ... 1st end part, 54 ... 2nd movable core, 54c ... convex part, 54s ... seal part, 55 ... second end, 60 ... fixed core, 61 ... first fixed core member, 62 ... second fixed core member, 70 ... coil, 71 ... bobbin, 81 ... first spring, 82 ... second spring, 100 ... fuel Injection valve

Claims (6)

燃料噴射弁（１００）であって、
燃料を噴射する噴孔（３１）と内部に前記噴孔に連通する流路（４３）が形成された筒状のハウジング（２０）と、
前記ハウジングの内部に設けられ、前記噴孔を開閉する弁体（４１）を有するニードル（４０）と、
前記ニードルを移動させる可動コア（５０）と、
前記可動コアを前記ニードルの開弁方向に移動させる磁界を発生させるコイル（７０）と、
前記可動コアの上流側に設けられ、前記可動コアの移動範囲を規制する固定コア（６０）と、
前記ハウジングと前記可動コアとの間に囲まれたダンパ室（２５）と、
を備え、
前記可動コアは、互いに独立して摺動可能であり、かつ、シール部（５４ｓ）で互いに当接する第１可動コア（５１）と第２可動コア（５４）とを、前記第１可動コアが、前記固定コア側となるように有し、
前記第１可動コアは、前記ハウジングとの間に第１摺動部（２１ａ）と前記第２可動コアと当接可能な第１端部（５３ｓ）と、を有し、
前記第２可動コアは、前記ハウジングとの間に前記第１摺動部の外径よりも小さい外径の第２摺動部（２１ｂ）と、前記第１可動コア側に前記第２摺動部の外径よりも大きく形成され、前記第１端部と接したとき、前記ダンパ室に至る燃料通路を閉塞する第２端部（５５）と、を有する、
燃料噴射弁。 The fuel injection valve (100)
A tubular housing (20) in which a fuel injection hole (31) and a flow path (43) communicating with the injection hole are formed inside.
A needle (40) provided inside the housing and having a valve body (41) that opens and closes the injection hole.
A movable core (50) for moving the needle and
A coil (70) that generates a magnetic field that moves the movable core in the valve opening direction of the needle, and
A fixed core (60) provided on the upstream side of the movable core and regulating the movement range of the movable core, and
A damper chamber (25) surrounded between the housing and the movable core,
With
The movable core is slidable independently of each other, and the first movable core (51) and the second movable core (54), which are in contact with each other at the seal portion (54s), are formed by the first movable core. , Hold so that it is on the fixed core side
The first movable core has a first sliding portion (21a) between the first movable core and the housing, and a first end portion (53s) capable of contacting the second movable core.
The second movable core has a second sliding portion (21b) having an outer diameter smaller than the outer diameter of the first sliding portion between the housing and the second sliding portion (21b) and the second sliding portion on the first movable core side. It is formed larger than the outer diameter of the portion and has a second end portion (55) that closes the fuel passage leading to the damper chamber when in contact with the first end portion.
Fuel injection valve. 請求項１に記載の燃料噴射弁であって、
前記シール部は、前記第２摺動部より径方向の外側に位置する、燃料噴射弁。 The fuel injection valve according to claim 1.
The seal portion is a fuel injection valve located on the outer side in the radial direction from the second sliding portion. 請求項１または請求項２に記載の燃料噴射弁であって、
前記第２端部は、前記第１可動コアに向けて突き出る凸部（５４ｃ）を有し、
前記シール部は、前記凸部と前記第１可動コアとが当接する面である、燃料噴射弁。 The fuel injection valve according to claim 1 or 2.
The second end has a convex portion (54c) protruding toward the first movable core.
The seal portion is a fuel injection valve which is a surface where the convex portion and the first movable core come into contact with each other. 請求項１または請求項２に記載の燃料噴射弁であって、
前記第１可動コアは、前記第２端部に向けて突き出る凸部を有し、
前記シール部は、前記凸部と前記第２端部とが当接する面である、燃料噴射弁。 The fuel injection valve according to claim 1 or 2.
The first movable core has a convex portion that protrudes toward the second end portion.
The seal portion is a fuel injection valve which is a surface where the convex portion and the second end portion come into contact with each other. 請求項１から請求項４のいずれか一項に記載の燃料噴射弁であって、
前記燃料は気体である、燃料噴射弁。 The fuel injection valve according to any one of claims 1 to 4.
A fuel injection valve in which the fuel is a gas. 請求項５に記載の燃料噴射弁であって、
前記気体は、水素である、燃料噴射弁。 The fuel injection valve according to claim 5.
The gas is hydrogen, a fuel injection valve.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09126093A (en) * 1995-09-29 1997-05-13 Robert Bosch Gmbh Fuel injection valve for internal combusion engine
JP2012219656A (en) * 2011-04-05 2012-11-12 Denso Corp Fuel injection valve
JP2013227880A (en) * 2012-04-24 2013-11-07 Nippon Soken Inc Fuel injection valve
DE102016219722A1 (en) * 2016-10-11 2018-04-12 Robert Bosch Gmbh Controllable suction valve for a high pressure pump, high pressure pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09126093A (en) * 1995-09-29 1997-05-13 Robert Bosch Gmbh Fuel injection valve for internal combusion engine
JP2012219656A (en) * 2011-04-05 2012-11-12 Denso Corp Fuel injection valve
JP2013227880A (en) * 2012-04-24 2013-11-07 Nippon Soken Inc Fuel injection valve
DE102016219722A1 (en) * 2016-10-11 2018-04-12 Robert Bosch Gmbh Controllable suction valve for a high pressure pump, high pressure pump

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