JPWO2019087326A1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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JPWO2019087326A1
JPWO2019087326A1 JP2019550070A JP2019550070A JPWO2019087326A1 JP WO2019087326 A1 JPWO2019087326 A1 JP WO2019087326A1 JP 2019550070 A JP2019550070 A JP 2019550070A JP 2019550070 A JP2019550070 A JP 2019550070A JP WO2019087326 A1 JPWO2019087326 A1 JP WO2019087326A1
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fuel
swirl chamber
chamber
injection hole
injection
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JP6758521B2 (en
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翔太 川▲崎▼
翔太 川▲崎▼
宗実　毅
毅 宗実
啓祐 伊藤
啓祐 伊藤
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

本発明は、不純物が堆積した場合でも噴霧特性が良好な状態で維持される内燃機関用燃料噴射弁を提供する。弁座１２を開閉するための弁体１０を有し、弁体１０を動作させることにより、燃料が弁座１２の下流側開口部に装着された噴孔プレート１３に複数設けられた噴孔１４から噴射される燃料噴射弁において、噴孔プレート１３は、燃料に旋回力を付与し噴孔１４から燃料を外部へ噴射する旋回室１８と、旋回室１８に燃料を導入する燃料通路１７とを備え、旋回室１８は、その側壁部と底部が交差する箇所において、旋回室１８を拡張する方向に旋回室１８の側壁部を窪ませた凹部１９を有している。The present invention provides a fuel injection valve for an internal combustion engine in which spray characteristics are maintained in a good state even when impurities are deposited. A valve body 10 for opening and closing the valve seat 12 is provided. By operating the valve body 10, fuel is injected into a plurality of injection holes 14 provided in an injection hole plate 13 mounted on a downstream opening of the valve seat 12. In the fuel injection valve injected from the nozzle, the injection hole plate 13 includes a swirl chamber 18 that applies a swirling force to the fuel and injects the fuel from the injection hole 14 to the outside, and a fuel passage 17 that introduces the fuel into the swirl chamber 18. The swirling chamber 18 has a concave portion 19 in which the side wall of the swirling chamber 18 is depressed in a direction in which the swirling chamber 18 expands at a location where the side wall and the bottom intersect.

Description

本発明は、自動車の内燃機関などへの燃料供給に使用される燃料噴射弁に係り、特に噴霧特性における微粒化の促進を図った燃料噴射弁に関するものである。   The present invention relates to a fuel injection valve used for supplying fuel to an internal combustion engine of an automobile, and more particularly to a fuel injection valve which promotes atomization in spray characteristics.

近年、自動車の内燃機関などの排出ガス規制が強化される中、燃料噴射弁から噴射される燃料噴霧の微粒化が求められており、旋回流れを利用して微粒化を図る方式に関して様々な検討がなされている。
特許文献１では、弁ケーシング内に、弁座面と協働する弁閉鎖部材が配置されている形式のものにおいて、弁座面の下流に中央開口が設けられており、中央開口から半径方向へ少なくとも２つの接線方向通路が延びており、各接線方向通路がそれぞれ各スワール室に接線方向で開口しており、燃料のための定量開口がそれぞれ、上記スワール室の中央から外側へ通じている燃料噴射が開示されている。In recent years, as emission regulations for internal combustion engines of automobiles have been tightened, atomization of fuel spray injected from fuel injection valves has been required, and various studies have been made on methods for atomizing fuel using swirl flow. Has been made.
In Patent Literature 1, in a type in which a valve closing member cooperating with a valve seat surface is arranged in a valve casing, a central opening is provided downstream of the valve seat surface, and the central opening is provided in a radial direction from the central opening. At least two tangential passages extend, each tangential passage opening tangentially to each swirl chamber, and a fuel metering opening for fuel respectively extending from the center of the swirl chamber to the outside. Injection is disclosed.

特開平１−２７１６５６号公報JP-A 1-271656

従来例の旋回流れを利用した燃料噴射弁の構成では、燃料に含まれた不純物が旋回室内に滞積した場合、燃料が旋回する際の角速度が低下する。旋回室内での角速度は、燃料噴射後の噴霧広がり角や噴霧の微粒化といった性能に影響を与える。結果的に、燃料に含まれた不純物が旋回室に堆積することにより、噴霧広がり角の変化や、噴霧微粒化の悪化が生じる恐れがある。   In the configuration of the fuel injection valve using the swirling flow of the conventional example, when impurities contained in the fuel accumulate in the swirling chamber, the angular velocity at which the fuel swirls decreases. The angular velocity in the swirl chamber affects performance such as the spray divergence angle and the atomization of the spray after fuel injection. As a result, the impurities contained in the fuel accumulate in the swirl chamber, which may cause a change in the spray divergence angle and deterioration of the spray atomization.

本発明は係る事情に鑑みてなされたものであり、旋回室内に不純物を堆積させる凹部を設けることで、不純物が堆積した場合でも噴霧特性が良好な状態で維持される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 the above circumstances, and provides a fuel injection valve in which a spray characteristic is maintained in a good state even when impurities are deposited by providing a recess for depositing impurities in a swirl chamber. With the goal.

本発明に係わる燃料噴射弁は、弁座を開閉するための弁体を有し、前記弁体を動作させることにより、燃料が前記弁座の下流側開口部に装着された噴孔プレートに複数設けられた噴孔から噴射される燃料噴射弁において、前記噴孔プレートは、前記燃料に旋回力を付与し前記噴孔から前記燃料を外部へ噴射する旋回室と、前記旋回室に燃料を導入する燃料通路とを備え、前記旋回室は、その側壁部と底部が交差する箇所において、前記旋回室を拡張する方向に前記旋回室の側壁部を窪ませた凹部を有する。   The fuel injection valve according to the present invention has a valve body for opening and closing a valve seat, and by operating the valve body, fuel is supplied to a plurality of injection hole plates mounted on a downstream opening of the valve seat. In a fuel injection valve that is injected from a provided injection hole, the injection hole plate applies a swirling force to the fuel to inject the fuel from the injection hole to the outside, and introduces fuel into the swirl chamber. The swirl chamber has a recess in which the side wall of the swirl chamber is depressed in a direction in which the swirl chamber expands at a location where the side wall and the bottom intersect.

本発明に係わる燃料噴射弁は、弁座開口部から旋回室へ流れ込んだ燃料は、旋回流れを生じながら噴孔へ流れ込む。噴孔内部においても旋回流れが保たれることで、噴孔内壁に沿った薄い液膜が形成され、薄い液膜を噴孔から中空円錐状に噴射することで燃料の微粒化が促進される。
さらに、旋回室の側壁部と底部が交差する箇所において、旋回室を拡張する方向に旋回室の側壁部を窪ませた凹部を有することにより、この凹部内では旋回室内と比較すると流速が遅くなることから、燃料内の不純物はこの凹部内に堆積し易くなる。凹部内は流速が遅いため、凹部内に不純物が堆積したとしても旋回室内の平均流速はほぼ変化しないことから、旋回をする燃料の角速度への影響は小さい。この旋回室内での角速度は、燃料噴射後の噴霧特性に影響を与える。
よって旋回室内に凹部を設ける事によって、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。In the fuel injection valve according to the present invention, the fuel flowing into the swirl chamber from the valve seat opening flows into the injection hole while generating a swirl flow. By maintaining the swirling flow inside the injection hole, a thin liquid film is formed along the inner wall of the injection hole, and the atomization of fuel is promoted by injecting the thin liquid film from the injection hole into a hollow cone .
Furthermore, at the place where the side wall and the bottom of the swirl chamber intersect, a recess is formed by depressing the side wall of the swivel chamber in the direction in which the swivel chamber is expanded. Therefore, impurities in the fuel are easily deposited in the concave portions. Since the flow velocity in the concave portion is low, even if impurities accumulate in the concave portion, the average flow velocity in the swirl chamber hardly changes, so that the influence on the angular velocity of the fuel swirling is small. The angular velocity in the swirl chamber affects the spray characteristics after fuel injection.
Therefore, by providing the concave portion in the swirl chamber, it is possible to suppress a change in the spray divergence angle due to the accumulation of impurities in the fuel and a deterioration in spray atomization.

本発明の実施の形態1の燃料噴射弁を示す断面図である。FIG. 1 is a sectional view showing a fuel injection valve according to a first embodiment of the present invention. 実施の形態１における燃料噴射弁先端部を示すもので、（ａ）は燃料噴射弁先端部の断面図、（ｂ）はＡ−Ａ線を矢印方向に見た平面図である。1A and 1B show a front end portion of a fuel injection valve according to a first embodiment, in which FIG. 1A is a cross-sectional view of the front end portion of the fuel injection valve, and FIG. 図２（ｂ）を拡大した平面図と、Ｂ−Ｂ線を矢印方向に見た断面図である。FIG. 2B is an enlarged plan view of FIG. 2B and a cross-sectional view taken along line BB in an arrow direction. 実施の形態１における旋回室部分を示す断面図である。FIG. 3 is a cross-sectional view illustrating a swirl chamber portion according to the first embodiment. 本発明の実施の形態２における旋回室部分を示す断面図である。It is sectional drawing which shows the swirl chamber part in Embodiment 2 of this invention. 本発明の実施の形態３における燃料噴射弁先端部を示すもので、（ａ）は燃料噴射弁先端部の断面図、（ｂ）はＣ−Ｃ線を矢印方向に見た平面図である。9A and 9B show a tip portion of a fuel injection valve according to Embodiment 3 of the present invention, wherein FIG. 9A is a cross-sectional view of the tip portion of the fuel injection valve, and FIG. 実施の形態３における旋回室部分を示す断面図である。FIG. 13 is a cross-sectional view illustrating a swirl chamber portion according to a third embodiment. 本発明の実施の形態４における旋回室部分を示す断面図である。It is sectional drawing which shows the swirl chamber part in Embodiment 4 of this invention.

実施の形態１．
図1〜４は、本発明の実施の形態1の燃料噴射弁を示す図である。図１において、１は燃料噴射弁を示しており、ソレノイド装置４、磁気回路のヨーク部分であるハウジング５、磁気回路の固定鉄心部分であるコア６、コイル７、磁気回路の可動鉄心部分であるアマチュア８、弁装置９を有しており、弁装置９は弁体１０と弁本体１１と弁座１２で構成されている。
弁本体１１はコア６の外径部に圧入後、溶接されている。アマチュア８は弁体１０に圧入後、溶接されている。弁座１２には噴孔プレート１３が溶接部１３ａにより結合されている。噴孔プレート１３には板厚方向に貫通する複数の噴孔１４が設けられている。
噴孔プレート１３は、燃料に旋回力を付与し噴孔１４から燃料を外部へ噴射する旋回室１８と、旋回室１８に燃料を導入する燃料通路１７とを備えている。
また、図２から４に示すように、前記旋回室は、その側壁部と底部が交差する箇所において、前記旋回室を拡張する方向に前記旋回室の側壁部を窪ませた凹部１９を有する。
なお、燃料通路１７は、十字状に交差するように形成され、旋回室１８は、燃料通路１７の下流側の４箇所に配置され、旋回室１８の中央部に対応する位置に噴孔１４が設けられている。Embodiment 1 FIG.
1 to 4 are views showing a fuel injection valve according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a fuel injection valve, which is a solenoid device 4, a housing 5, which is a yoke portion of a magnetic circuit, a core 6, which is a fixed core portion of the magnetic circuit, a coil 7, and a movable core portion of the magnetic circuit. An amateur 8 and a valve device 9 are provided. The valve device 9 includes a valve body 10, a valve body 11, and a valve seat 12.
The valve body 11 is press-fitted into the outer diameter portion of the core 6 and then welded. The amateur 8 is welded after being pressed into the valve body 10. An injection hole plate 13 is connected to the valve seat 12 by a weld 13a. The injection hole plate 13 is provided with a plurality of injection holes 14 penetrating in the thickness direction.
The injection hole plate 13 includes a swirl chamber 18 that applies a swirling force to the fuel and injects the fuel from the injection holes 14 to the outside, and a fuel passage 17 that introduces the fuel into the swirl chamber 18.
Further, as shown in FIGS. 2 to 4, the swirling chamber has a concave portion 19 in which the side wall of the swiveling chamber is depressed in a direction in which the swiveling chamber extends at a location where the side wall and the bottom intersect.
The fuel passage 17 is formed so as to cross in a cross shape. The swirl chambers 18 are arranged at four locations on the downstream side of the fuel passage 17, and the injection holes 14 are formed at positions corresponding to the center of the swirl chamber 18. Is provided.

このように構成された燃料噴射弁1において、エンジンの制御装置より燃料噴射弁１の駆動回路に動作信号が送られると、燃料噴射弁１のコイル７に電流が通電され、アマチュア８、コア６、ハウジング５、弁本体１１で構成される磁気回路に磁束が発生し、アマチュア８はコア６側へ吸引動作し、アマチュア８と一体構造である弁体１０が弁座シート部１２ａから離れて隙間が形成される。
燃料は弁体１０の先端部に溶接されたボール１５の面取り部１５ａから弁座シート部１２ａと弁体１０の隙間を通って、複数の噴孔１４からエンジン吸気通路に噴射される。
次にエンジンの制御装置より燃料噴射弁１の駆動回路に動作の停止信号が送られると、コイル７の電流の通電が停止し、磁気回路中の磁束が減少して、弁体１０を閉弁方向に押している圧縮ばね１６により弁体１０と弁座シート部１２ａ間の隙間は閉じ状態となり、燃料噴射が終了する。
弁体１０はアマチュア側面８ａで弁本体１１とのガイド部と摺動し、開弁状態ではアマチュア上面８ｂがコア６の下面と当接する。In the fuel injection valve 1 configured as described above, when an operation signal is sent from the engine control device to the drive circuit of the fuel injection valve 1, a current is supplied to the coil 7 of the fuel injection valve 1, and the armature 8 and the core 6 Magnetic flux is generated in a magnetic circuit composed of the housing 5, the valve body 11, and the armature 8 is attracted to the core 6 side, so that the valve body 10 integrated with the armature 8 is separated from the valve seat 12a to form a gap. Is formed.
The fuel is injected from the plurality of injection holes 14 into the engine intake passage from the chamfered portion 15a of the ball 15 welded to the distal end portion of the valve body 10, through the gap between the valve seat 12a and the valve body 10.
Next, when a stop signal of the operation is sent from the control device of the engine to the drive circuit of the fuel injection valve 1, the current supply to the coil 7 stops, the magnetic flux in the magnetic circuit decreases, and the valve body 10 closes. The gap between the valve body 10 and the valve seat 12a is closed by the compression spring 16 pushing in the direction, and the fuel injection ends.
The valve body 10 slides on a guide portion with the valve body 11 on the side surface 8a of the armature, and the upper surface 8b of the armature comes into contact with the lower surface of the core 6 in a valve-open state.

実施の形態１では、図２から４に示すように、噴孔プレート１３の上流側を窪ませることにより、燃料に旋回力を付与する複数（図では４個）の旋回室１８が形成されている。旋回室１８に対応して、旋回室１８に燃料を導入する燃料通路１７が設けられている。燃料通路１７は、弁座開口部１２ｂと連通している。
これにより、弁座開口部１２ｂから旋回室１８へ流れ込んだ燃料は、旋回流れを生じながら噴孔１４へ流れ込む。噴孔１４の内部においても旋回流れが保たれることで、噴孔内壁に沿った薄い液膜が形成され、薄い液膜を噴孔１４から中空円錐状に噴射することで燃料の微粒化が促進される。
また、旋回室１８内を流れる燃料は、一般的に壁面に近いほど流速が遅くなることから、旋回室１８の角隅部に不純物が堆積しやすくなる。燃料に含まれた不純物が旋回室１８内に滞積した場合、燃料が旋回する際の角速度が低下し、燃料噴射後の噴霧広がり角の変化や、噴霧微粒化の悪化が生じる恐れがある。In the first embodiment, as shown in FIGS. 2 to 4, a plurality (four in the figure) of swirling chambers 18 that impart a swirling force to the fuel are formed by recessing the upstream side of the injection hole plate 13. I have. A fuel passage 17 for introducing fuel into the swirl chamber 18 is provided corresponding to the swirl chamber 18. The fuel passage 17 communicates with the valve seat opening 12b.
Thus, the fuel flowing from the valve seat opening 12b into the swirl chamber 18 flows into the injection hole 14 while generating a swirl flow. By maintaining the swirling flow inside the injection hole 14, a thin liquid film is formed along the inner wall of the injection hole, and the thin liquid film is injected from the injection hole 14 into a hollow cone to atomize the fuel. Promoted.
In general, the flow rate of the fuel flowing in the swirling chamber 18 decreases as it approaches the wall surface, so that impurities easily accumulate in the corners of the swirling chamber 18. If the impurities contained in the fuel accumulate in the swirl chamber 18, the angular velocity of the fuel when swirling is reduced, which may cause a change in the spray divergence angle after the fuel injection and deterioration of the atomization of the spray.

そこで実施の形態１の燃料噴射弁１では、図２から４に示すように、旋回室１８の側壁部と底部が交差する箇所において、旋回室１８を拡張する方向に旋回室１８の側壁部を窪ませた断面矩形形状の凹部１９を有している。
この凹部１９内では旋回室１８内の流れと比較すると流速が遅くなることから、燃料内の不純物はこの凹部１９内に堆積し易くなる。凹部１９内は流速が遅いため、凹部内に不純物が堆積したとしても旋回室１８内の平均流速はほぼ変化しないことから、旋回室１８で旋回する燃料の角速度への影響は小さい。
このように旋回室１８内に凹部１９を設ける事によって、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。Therefore, in the fuel injection valve 1 of the first embodiment, as shown in FIGS. 2 to 4, at a place where the side wall and the bottom of the swirl chamber 18 intersect, the side wall of the swirl chamber 18 is extended in the direction in which the swirl chamber 18 is expanded. It has a concave portion 19 having a rectangular cross-sectional shape.
Since the flow velocity in the recess 19 is lower than that in the swirl chamber 18, impurities in the fuel are more likely to accumulate in the recess 19. Since the flow velocity in the concave portion 19 is low, even if impurities accumulate in the concave portion, the average flow velocity in the swirl chamber 18 hardly changes, so that the influence on the angular velocity of the fuel swirled in the swirl chamber 18 is small.
By providing the recess 19 in the swirling chamber 18 in this manner, it is possible to suppress a change in the spray divergence angle due to the accumulation of impurities in the fuel and a deterioration in the atomization of the spray.

以上のように、本発明は、弁座１２を開閉するための弁体１０を有し、弁体１０を動作させることにより、燃料が弁座１２の下流側開口部に装着された噴孔プレート１３に複数設けられた噴孔１４から噴射される燃料噴射弁において、噴孔プレート１３は、燃料に旋回力を付与し噴孔１４から燃料を外部へ噴射する旋回室１８と、旋回室１８に燃料を導入する燃料通路１７とを備え、旋回室１８は、その側壁部と底部が交差する箇所において、旋回室１８を拡張する方向に旋回室１８の側壁部を窪ませた凹部１９を有するもので、この凹部内ではこの凹部内では旋回室内と比較すると流速が遅くなることから、燃料内の不純物はこの凹部内に堆積し易くなる。凹部内は流速が遅いため、凹部内に不純物が堆積したとしても旋回室内の平均流速はほぼ変化しないことから、旋回をする燃料の角速度への影響は小さい。この旋回室内での角速度は、燃料噴射後の噴霧特性に影響を与える。
よって旋回室内に凹部を設ける事によって、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。内と比較すると流速が遅くなることから、燃料内の不純物はこの凹部１９内に堆積し易くなり、凹部１９内は流速が遅いため、凹部１９内に不純物が堆積したとしても旋回室１８内の平均流速はほぼ変化しないことから、旋回をする燃料の角速度への影響は小さくなり、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。As described above, the present invention has the valve element 10 for opening and closing the valve seat 12, and by operating the valve element 10, the fuel is supplied to the injection hole plate mounted on the downstream opening of the valve seat 12. In a fuel injection valve that is injected from a plurality of injection holes 14 provided in the injection hole 13, the injection hole plate 13 provides a swirl chamber 18 that applies a swirling force to the fuel and injects the fuel from the injection hole 14 to the outside, and a swirl chamber 18. A fuel passage 17 for introducing fuel, wherein the swirl chamber 18 has a recess 19 in which the side wall of the swirl chamber 18 is depressed in a direction in which the swirl chamber 18 expands at a location where the side wall and the bottom intersect. Since the flow velocity in the concave portion is lower in the concave portion than in the swirl chamber, impurities in the fuel are more likely to be deposited in the concave portion. Since the flow velocity in the concave portion is low, even if impurities accumulate in the concave portion, the average flow velocity in the swirl chamber hardly changes, so that the influence on the angular velocity of the fuel swirling is small. The angular velocity in the swirl chamber affects the spray characteristics after fuel injection.
Therefore, by providing the concave portion in the swirl chamber, it is possible to suppress a change in the spray divergence angle due to the accumulation of impurities in the fuel and a deterioration in spray atomization. Since the flow velocity is slower than that inside, the impurities in the fuel are more likely to accumulate in the recess 19, and the flow velocity in the depression 19 is slow. Since the average flow velocity does not substantially change, the influence on the angular velocity of the swirling fuel is small, and it is possible to suppress the change in the spray divergence angle due to the accumulation of impurities in the fuel and the deterioration of the atomization of the spray.

実施の形態２．
図５は、本発明の実施の形態２の旋回室部分の断面図である。燃料流れは壁面に近いほど流速が小さくなることから、凹部１９での流速低減効果を得るためには、凹部１９内の壁面間距離をある程度短くする必要がある。旋回室１８の側壁部の長さに対して凹部１９が占める割合が半分を超えてしまうと、凹部１９内の壁面間距離が大きくなり、凹部１９における流速の低減効果が弱まってしまう。Embodiment 2 FIG.
FIG. 5 is a cross-sectional view of a swirl chamber portion according to Embodiment 2 of the present invention. Since the flow velocity of the fuel flow decreases as it approaches the wall surface, the distance between the wall surfaces in the concave portion 19 needs to be reduced to some extent in order to obtain the flow velocity reduction effect in the concave portion 19. If the ratio of the concave portion 19 to the length of the side wall portion of the swirling chamber 18 exceeds half, the distance between the wall surfaces in the concave portion 19 becomes large, and the effect of reducing the flow velocity in the concave portion 19 is reduced.

そこで実施の形態２では、旋回室１８を旋回室１８の底部に垂直な断面で見たときに、旋回室１８の天井部から底部までの距離をｈ、旋回室１８の側壁部から凹部１９を除いた長さをｄとしたとき、ｄ／ｈ＞０．５の関係としている。
これにより、凹部内において流速が低減する効果が強化されることから、実施の形態１で述べたような燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する効果を得ることができる。
なお、参考までに一例を示すと、ｈ＝０．１２mmの場合、ｄ＝０．０８mmとし、ｄ／ｈ＝０．６７に設定することができる。この場合、凹部１９の高さ（ｈ−ｄ）は、０．０４mmとなるが、燃料内の不純物のうちサイズの大きいものは上流側に設けられたフィルターによって排除されるため、凹部１９の高さはフィルターのメッシュサイズ程度の値に設定すれば良い。Therefore, in the second embodiment, when the swirl chamber 18 is viewed in a cross section perpendicular to the bottom of the swirl chamber 18, the distance from the ceiling to the bottom of the swirl chamber 18 is h, and the recess 19 is formed from the side wall of the swirl chamber 18. When the removed length is d, d / h> 0.5.
Thereby, the effect of reducing the flow velocity in the concave portion is enhanced, and thus the effect of suppressing the change of the spray divergence angle due to the accumulation of impurities in the fuel and the deterioration of the atomization of the spray as described in the first embodiment. Can be obtained.
As an example for reference, when h = 0.12 mm, d = 0.08 mm and d / h = 0.67 can be set. In this case, the height (h−d) of the concave portion 19 is 0.04 mm. However, among the impurities in the fuel, those having a large size are eliminated by a filter provided on the upstream side, and thus the height of the concave portion 19 is reduced. What is necessary is just to set a value to about the mesh size of a filter.

実施の形態３.
図６、図７に本発明の実施の形態３の燃料噴射弁を示す。噴孔プレート１３は、燃料通路１７および旋回室１８の側壁部を構成する上流側プレート２０と、燃料通路１７および旋回室１８の底部を構成し噴孔１４が開口する下流側プレート２１によって構成されている。
上流側プレート２０に燃料通路１７、旋回室１８、凹部１９を加工したのちに、上流側プレート２０と下流側プレート２１は溶接、ロウ付け、拡散接合等の方法で接合される。このように噴孔プレート１３を分割した構成にすることで、凹部１９の加工が容易になり、生産性が向上する。Embodiment 3.
6 and 7 show a fuel injection valve according to Embodiment 3 of the present invention. The injection hole plate 13 is composed of an upstream plate 20 that forms the side wall of the fuel passage 17 and the swirl chamber 18, and a downstream plate 21 that forms the bottom of the fuel passage 17 and the swirl chamber 18 and has the injection hole 14 opened. ing.
After processing the fuel passage 17, the swirl chamber 18, and the recess 19 in the upstream plate 20, the upstream plate 20 and the downstream plate 21 are joined by a method such as welding, brazing, or diffusion joining. By dividing the injection hole plate 13 in this way, the processing of the concave portion 19 is facilitated, and the productivity is improved.

実施の形態４.
図８は本発明の実施の形態４の旋回室部分の断面図である。実施の形態１〜３では凹部１９は断面矩形形状としていたが、本実施の形態では、凹部１９は断面Ｒ形状としている。従って矩形形状とした場合よりも凹部１９内の壁面間距離が小さくなり、凹部１９内の燃料流れの速度低減効果が強化されるため、実施の形態１で述べたような燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する効果を得ることができる。 Embodiment 4.
FIG. 8 is a sectional view of a swirl chamber portion according to Embodiment 4 of the present invention. In the first to third embodiments, the concave portion 19 has a rectangular cross-section, but in the present embodiment, the concave portion 19 has an R-shaped cross section. Therefore, the distance between the wall surfaces in the concave portion 19 is smaller than in the case of the rectangular shape, and the effect of reducing the velocity of the fuel flow in the concave portion 19 is enhanced, so that the accumulation of impurities in the fuel as described in the first embodiment. The effect of suppressing the change of the spray divergence angle and the deterioration of the atomization of the spray can be obtained.

なお、本発明は実施の形態に限定されるものではなく、種々の設計変更を行うことが可能であり、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略したりすることが可能である。   Note that the present invention is not limited to the embodiments, and various design changes can be made. Within the scope of the invention, the embodiments can be freely combined or the embodiments can be combined. Modifications and omissions can be made as appropriate.

１ 燃料噴射弁、４ ソレノイド装置、５ ハウジング、６ コア、７ コイル、８ アマチュア、８ａ アマチュア側面、８ｂ アマチュア上面、９ 弁装置、１０ 弁体、１１ 弁本体、１２ 弁座、１２ａ 弁座シート部、１２ｂ 弁座開口部、１３ 噴孔プレート、１４ 噴孔、１５ ボール、１５ａ 面取り部、１６ 圧縮ばね、１７ 燃料通路、１８ 旋回室、１９ 凹部、２０ 上流側プレート、２１ 下流側プレート   Reference Signs List 1 fuel injection valve, 4 solenoid device, 5 housing, 6 core, 7 coil, 8 amateur, 8a amateur side, 8b amateur upper surface, 9 valve device, 10 valve body, 11 valve body, 12 valve seat, 12a valve seat portion , 12b valve seat opening, 13 injection hole plate, 14 injection hole, 15 ball, 15a chamfer, 16 compression spring, 17 fuel passage, 18 swirl chamber, 19 recess, 20 upstream plate, 21 downstream plate

以上のように、本発明は、弁座１２を開閉するための弁体１０を有し、弁体１０を動作させることにより、燃料が弁座１２の下流側開口部に装着された噴孔プレート１３に複数設けられた噴孔１４から噴射される燃料噴射弁において、噴孔プレート１３は、燃料に旋回力を付与し噴孔１４から燃料を外部へ噴射する旋回室１８と、旋回室１８に燃料を導入する燃料通路１７とを備え、旋回室１８は、その側壁部と底部が交差する箇所において、旋回室１８を拡張する方向に旋回室１８の側壁部を窪ませた凹部１９を有するもので、この凹部内では旋回室内と比較すると流速が遅くなることから、燃料内の不純物はこの凹部内に堆積し易くなる。凹部内は流速が遅いため、凹部内に不純物が堆積したとしても旋回室内の平均流速はほぼ変化しないことから、旋回をする燃料の角速度への影響は小さい。この旋回室内での角速度は、燃料噴射後の噴霧特性に影響を与える。
よって旋回室内に凹部を設ける事によって、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。内と比較すると流速が遅くなることから、燃料内の不純物はこの凹部１９内に堆積し易くなり、凹部１９内は流速が遅いため、凹部１９内に不純物が堆積したとしても旋回室１８内の平均流速はほぼ変化しないことから、旋回をする燃料の角速度への影響は小さくなり、燃料内の不純物の堆積による噴霧広がり角の変化や、噴霧微粒化の悪化を抑制する事ができる。

As described above, the present invention has the valve element 10 for opening and closing the valve seat 12, and by operating the valve element 10, the fuel is supplied to the injection hole plate mounted on the downstream opening of the valve seat 12. In a fuel injection valve that is injected from a plurality of injection holes 14 provided in the injection hole 13, the injection hole plate 13 provides a swirl chamber 18 that applies a swirling force to the fuel and injects the fuel from the injection hole 14 to the outside, and a swirl chamber 18. A fuel passage 17 for introducing fuel, wherein the swirl chamber 18 has a recess 19 in which the side wall of the swirl chamber 18 is depressed in a direction in which the swirl chamber 18 expands at a location where the side wall and the bottom intersect. in, when in this the recess compared with the swivel chamber from the flow speed becomes slow, impurities in the fuel is easily deposited in the recess. Since the flow velocity in the concave portion is low, even if impurities accumulate in the concave portion, the average flow velocity in the swirl chamber hardly changes, so that the influence on the angular velocity of the fuel swirling is small. The angular velocity in the swirl chamber affects the spray characteristics after fuel injection.
Therefore, by providing the concave portion in the swirl chamber, it is possible to suppress a change in the spray divergence angle due to the accumulation of impurities in the fuel and a deterioration in spray atomization. Since the flow velocity is slower than that inside, the impurities in the fuel are more likely to accumulate in the recess 19, and the flow velocity in the depression 19 is slow. Since the average flow velocity does not substantially change, the influence on the angular velocity of the swirling fuel is small, and it is possible to suppress the change in the spray divergence angle due to the accumulation of impurities in the fuel and the deterioration of the atomization of the spray.

Claims (6)

弁座を開閉するための弁体を有し、前記弁体を動作させることにより、燃料が前記弁座の下流側開口部に装着された噴孔プレートに複数設けられた噴孔から噴射される燃料噴射弁において、
前記噴孔プレートは、前記燃料に旋回力を付与し前記噴孔から前記燃料を外部へ噴射する旋回室と、前記旋回室に燃料を導入する燃料通路とを備え、
前記旋回室は、その側壁部と底部が交差する箇所において、前記旋回室を拡張する方向に前記旋回室の側壁部を窪ませた凹部を有することを特徴とする燃料噴射弁。It has a valve body for opening and closing a valve seat, and by operating the valve body, fuel is injected from a plurality of injection holes provided in an injection hole plate mounted on a downstream opening of the valve seat. In the fuel injector,
The injection hole plate includes a swirl chamber that applies a swirling force to the fuel and injects the fuel from the injection hole to the outside, and a fuel passage that introduces fuel into the swirl chamber.
The fuel injection valve according to claim 1, wherein the swirl chamber has a concave portion in which the side wall of the swirl chamber is depressed in a direction in which the swirl chamber expands at a location where the side wall and the bottom intersect. 前記旋回室は、その底部に垂直な断面で見たときに、前記旋回室の天井部から底部までの距離をｈ、前記旋回室の側壁部から前記凹部を除いた長さをｄとしたとき、
ｄ／ｈ＞０．５の関係にあることを特徴とする請求項１記載の燃料噴射弁。The swirling chamber has a distance h from the ceiling to the bottom of the swirling chamber when viewed in a cross section perpendicular to the bottom thereof, and a length d excluding the recess from the side wall of the swirling chamber. ,
2. The fuel injection valve according to claim 1, wherein d / h> 0.5. 前記噴孔プレートは、前記燃料通路および前記旋回室の側壁部を構成する上流側プレートと、前記燃料通路および前記旋回室の底部を構成し前記噴孔が開口する下流側プレートによって構成されることを特徴とする請求項１または２記載の燃料噴射弁。   The injection hole plate is configured by an upstream plate forming the fuel passage and a side wall of the swirl chamber, and a downstream plate forming the fuel passage and the bottom of the swirl chamber and opening the injection hole. The fuel injection valve according to claim 1 or 2, wherein: 前記凹部は、断面矩形状を有することを特徴とする請求項１から３のいずれか一項に記載の燃料噴射弁。   The fuel injection valve according to claim 1, wherein the recess has a rectangular cross section. 前記凹部は、前記旋回室の側壁方向に連続的に拡大する断面Ｒ形状を有することを特徴とする請求項１から３のいずれか一項に記載の燃料噴射弁。   4. The fuel injection valve according to claim 1, wherein the recess has an R-shaped cross section that continuously increases in a side wall direction of the swirl chamber. 5. 前記燃料通路は、十字状に交差するように形成され、前記旋回室は、前記燃料通路の下流側の４箇所に配置されていることを特徴とする請求項１から５のいずれか一項に記載の燃料噴射弁。   The fuel passage according to any one of claims 1 to 5, wherein the fuel passage is formed so as to cross in a cross shape, and the swirl chambers are arranged at four locations downstream of the fuel passage. A fuel injection valve as described.
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