JP2008064051A - Fuel injection valve for internal combustion engine with oil-repellent coating - Google Patents

Fuel injection valve for internal combustion engine with oil-repellent coating Download PDF

Info

Publication number
JP2008064051A
JP2008064051A JP2006244099A JP2006244099A JP2008064051A JP 2008064051 A JP2008064051 A JP 2008064051A JP 2006244099 A JP2006244099 A JP 2006244099A JP 2006244099 A JP2006244099 A JP 2006244099A JP 2008064051 A JP2008064051 A JP 2008064051A
Authority
JP
Japan
Prior art keywords
oil
fuel injection
injection valve
internal combustion
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2006244099A
Other languages
Japanese (ja)
Inventor
Shoji Miyazaki
昭二 宮崎
Kazuhiko Shiratani
和彦 白谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2006244099A priority Critical patent/JP2008064051A/en
Publication of JP2008064051A publication Critical patent/JP2008064051A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Fuel-Injection Apparatus (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve for an internal combustion engine having PES/FEP combined type oil-repellent coating and a corner-shaped inward cross portion at a contour of a needle contact portion, capable of improving oil-repellent properties and a surface form so as to make oil drops promptly to slide and fall down preventing oil from staying around injection holes. <P>SOLUTION: In this fuel injection valve for the internal combustion engine having the PES/FEP combined type oil-repellent coating, the contour of the needle contact portion of the body in a two-step structure formed out of a conical base portion and a head portion protruding from the base portion, the inward corner-shaped cross portion between the base portion outer-periphery surface and the head portion outer-periphery surface, and a plurality of open injection holes arranged on the outer-periphery surface right adjacent to the cross portion of the head portion in a circumference form, the cross portion has an open angle 160° or more so that the oil drops sliding from the outer-periphery surface of the base portion to the outer periphery surface of the head portion may slide without staying on the cross portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、撥油被膜を備えた内燃機関用燃料噴射弁に関する。本発明は特に、内燃機関用燃料噴射弁において、ガソリン、軽油、潤滑油等の油性物質に由来するデポジットの発生を防止するのに有用である。   The present invention relates to a fuel injection valve for an internal combustion engine provided with an oil repellent coating. The present invention is particularly useful for preventing the occurrence of deposits derived from oily substances such as gasoline, light oil, and lubricating oil in internal combustion engine fuel injection valves.

自動車エンジン等の内燃機関では、燃料噴射弁の噴孔付近には噴霧された燃料や潤滑油の液滴が付着滞留することがあり、この液滴が燃焼室内の高温下で熱分解してデポジットを形成し噴孔を一部分でも塞いでしまうと、燃料噴射弁の噴霧特性が著しく損なわれ、内燃機関の正常な作動に悪影響が生ずる。   In an internal combustion engine such as an automobile engine, sprayed fuel or lubricating oil droplets may adhere and stay in the vicinity of the injection hole of the fuel injection valve. If a part of the nozzle hole is blocked, the spray characteristics of the fuel injection valve are significantly impaired, and the normal operation of the internal combustion engine is adversely affected.

デポジットの形成を防止するには、その由来する燃料や潤滑油の液滴を滞留させずに速やかに滑落させる必要がある。   In order to prevent the formation of deposits, it is necessary to quickly drop the fuel or lubricant oil droplets derived from the deposit without retaining them.

そのためには、液滴の付着滞留が起きる噴孔付近の表面に高い撥油性を付与することが有効であり、これは共に撥液であるという観点からは、水滴の付着滞留防止のための撥水性の付与と共通する。   For this purpose, it is effective to impart high oil repellency to the surface in the vicinity of the nozzle hole where the droplet stays and stays. From the viewpoint that both of these are liquid-repellent, the water-repellent property is used to prevent water droplets from staying and staying. Common with water-based application.

撥水性の付与については、例えば特許文献１に、水に対する接触角が１５０°以上の撥水部分（ＣＦ、ＣＦ２、ＣＦ３で対応構成）と、水に対する接触角が７０°以下の親水部分（ＮＨＣＯと環状鎖を介しＯと架橋）とを共存させた、水無しオフセット印刷に適した印刷版が提案されている。   For imparting water repellency, for example, in Patent Document 1, a water-repellent part having a contact angle with water of 150 ° or more (corresponding to CF, CF2, and CF3) and a hydrophilic part having a contact angle with water of 70 ° or less (NHCO And a printing plate suitable for waterless offset printing, in which O and a crosslink via a cyclic chain) coexist.

しかし、液滴の構成媒体が水ではなく油であるため、単に撥水性付与の延長として撥油性付与を達成することはできない。   However, since the constituent medium of the droplets is oil instead of water, it is impossible to achieve oil repellency simply as an extension of water repellency.

すなわち、基材表面が撥液性を発揮するためには、液滴を構成する媒体の表面張力に比べて基材表面の表面張力が十分に小さいことが必要である。媒体が水の場合、表面張力は７０dyne/cmであるが、これに比べて本発明が対象とするガソリン、軽油、潤滑油等の油性媒体の場合、表面張力は１７〜２２dyne/cmと水に比べて遥かに小さい。したがって、撥水性付与のために表面張力が７０dyne/cmよりも十分に小さい撥水膜材料の選定は比較的容易であるのに対して、撥油性付与のために表面張力が１７〜２２dyne/cmよりも十分に小さい撥油膜材料を選定することは現実には非常に困難である。   That is, in order for the substrate surface to exhibit liquid repellency, it is necessary that the surface tension of the substrate surface is sufficiently smaller than the surface tension of the medium constituting the droplet. When the medium is water, the surface tension is 70 dyne / cm. On the other hand, when the medium is an oily medium such as gasoline, light oil, or lubricating oil, the surface tension is 17 to 22 dyne / cm. Much smaller than that. Therefore, it is relatively easy to select a water-repellent film material having a surface tension sufficiently smaller than 70 dyne / cm for imparting water repellency, whereas the surface tension is 17 to 22 dyne / cm for imparting oil repellency. In reality, it is very difficult to select an oil-repellent film material sufficiently smaller than that.

そのため従来は、燃料噴射弁の噴孔近傍の表面から燃料や潤滑油の液滴を速やかに滑落させるのに十分な撥油性を付与することはできなかった。   For this reason, conventionally, it has not been possible to impart sufficient oil repellency to quickly drop fuel or lubricating oil droplets from the surface near the nozzle hole of the fuel injection valve.

すなわち、撥油膜を形成した例として特許文献２には撥油膜（ＥＴＦＥ、ＰＶＦ、ＰＶＤＦ、ＥＣＴＦＥ、ＰＣＴＦＥ、ＰＦＡ、ＰＴＦＥ、ＦＥＰ）を形成した動圧軸受装置が開示され、特許文献３には凝縮器および蒸発器の冷媒用チューブ、圧縮機の吸入側の冷媒配管の内壁面に撥油膜を形成し、圧縮機の潤滑油が熱交換部分のチューブに付着するのを防止した冷凍サイクルが開示され、特許文献４には過給機のディフューザ流路を挟んで対峙するシールプレート隣接部、ハウジング隣接部に撥油膜を形成し、オイルミストの付着、炭化層の形成を防止した過給機が開示されているが、いずれも内燃機関の燃料噴射弁における油滴の付着滞留防止には有効でない。   That is, as an example in which an oil repellent film is formed, Patent Document 2 discloses a hydrodynamic bearing device in which an oil repellent film (ETFE, PVF, PVDF, ECTFE, PCTFE, PFA, PTFE, FEP) is formed. A refrigerating cycle is disclosed in which an oil-repellent film is formed on the inner wall surface of the refrigerant pipe of the compressor and the evaporator and the refrigerant piping on the suction side of the compressor, and the lubricant oil of the compressor is prevented from adhering to the tube of the heat exchange part. Patent Document 4 discloses a supercharger in which an oil repellent film is formed on an adjacent portion of a seal plate and a housing adjacent portion facing each other across a diffuser flow path of the supercharger, thereby preventing oil mist from adhering and forming a carbonized layer. However, none of them is effective in preventing the accumulation and retention of oil droplets in the fuel injection valve of the internal combustion engine.

また、特許文献５には撥油剤の塗布領域の表面粗さを塗布されていない軸体または回転体の表面粗さよりも粗くした流体軸受装置が開示され、特許文献６には撥油膜が形成される部位は、流体動圧軸受を構成する軸受面より表面粗度を粗くして形成し、撥油膜の剥がれを防止することが開示されているが、いずれも基材に対する撥油膜の密着性向上させるためのものであり、撥油膜自体については内燃機関の燃料噴射弁における燃料や潤滑油の液滴すなわち油滴の付着滞留防止の考慮がなされていない。   Further, Patent Document 5 discloses a hydrodynamic bearing device in which the surface roughness of the application region of the oil repellent agent is made rougher than the surface roughness of the shaft body or the rotating body that is not coated, and Patent Document 6 has an oil repellent film formed thereon. It is disclosed that the surface roughness is formed with a rougher surface roughness than the bearing surface constituting the fluid dynamic pressure bearing to prevent the oil repellent film from peeling off, but both improve the adhesion of the oil repellent film to the base material. The oil repellent film itself does not take into account the prevention of adhesion and retention of fuel or lubricating oil droplets, that is, oil droplets, in the fuel injection valve of the internal combustion engine.

更に、特許文献７には、噴口部分およびニードル先端部分を撥油性の被膜で覆うと共に、噴口部分を囲む筒状の撥油性および熱伝導性を有するシュラウド部材を設けた燃料噴射弁が開示され、特許文献８には、噴孔の内側表面および外側表面に撥油性を有するフッ素コーティングを施した燃料噴射弁が開示されている。しかし、フッ素コーティング等の撥油性を有する被膜を施しただけでは、付着燃料（ガソリン、軽油）の滑落性能が不十分であり油滴の滞留を防止できないため、噴孔周りのデポジット形成が避けられず、噴霧特性が低下する危険性を解消することができない。   Further, Patent Document 7 discloses a fuel injection valve in which a nozzle portion and a needle tip portion are covered with an oil-repellent coating, and a cylindrical shroud member having oil-repellent and thermal conductivity surrounding the nozzle portion is provided. Patent Document 8 discloses a fuel injection valve in which a fluorine coating having oil repellency is applied to an inner surface and an outer surface of an injection hole. However, simply applying a coating with oil repellency, such as a fluorine coating, will not allow the deposited fuel (gasoline, light oil) to slide down and prevent oil droplets from staying, so it is possible to avoid deposit formation around the nozzle hole. Therefore, it is impossible to eliminate the risk that the spray characteristics are deteriorated.

本発明者は、上記従来技術の問題を解消するために、金属基材の表面に撥油被膜を備え、該撥油被膜が、基材表面に密着したＰＥＳ（ポリエーテルサルフォン）の下層と、該下層のＰＥＳと一体を成すＰＥＳの連続相中にＦＥＰ（４弗化エチレン・６弗化プロピレン共重合体）の離散相が分散して成る上層とで構成され、該上層が該撥油被膜の表面として露出している内燃機関用燃料噴射弁を開発した。この撥油被膜により飛躍的に撥油性が向上し、従来であれば油性物質が滑落可能な油滴とならずに表面を濡らして広がってしまうような場合であっても、適正な油滴となって容易に滑落でき、デポジットの形成を防止することを可能とする。   In order to solve the above-described problems of the prior art, the present inventor has an oil-repellent coating on the surface of a metal substrate, and the oil-repellent coating has a lower layer of PES (polyether sulfone) adhered to the surface of the substrate. And an upper layer in which a discrete phase of FEP (tetrafluoroethylene / hexafluoropropylene copolymer) is dispersed in a continuous phase of PES integrated with the lower layer PES, and the upper layer is the oil repellent A fuel injection valve for an internal combustion engine exposed as the surface of the coating has been developed. This oil-repellent coating dramatically improves oil repellency, and even if the oily substance does not become slidable oil droplets and spreads by wetting the surface, Therefore, it can be easily slid down and the formation of deposits can be prevented.

しかし、上記のようなＰＥＳ／ＦＥＰ複合型の撥油被膜を用いても、燃料噴射弁が特定の外形の場合には、油滴の滑落が妨げられる場合があることが分かった。   However, it has been found that even when the PES / FEP composite type oil-repellent coating as described above is used, if the fuel injection valve has a specific outer shape, the oil droplets may be prevented from sliding off.

図１に示す燃料噴射弁は、ボディー１０のニードル当接部１２の外形が、円錐台状の基部１４と、基部１４から突き出た頭部１６との二段構造であり、基部１４の外周面Ａと頭部１６の外周面Ｂとの交差部Ｘは内向きのコーナーとなっており、頭部１６の交差部Ｘ直近の外周面Ｂに円周状に配列された複数の噴孔１８が開口している。   In the fuel injection valve shown in FIG. 1, the outer shape of the needle contact portion 12 of the body 10 is a two-stage structure having a truncated cone-shaped base portion 14 and a head portion 16 protruding from the base portion 14. The intersection X between A and the outer peripheral surface B of the head 16 is an inward corner, and a plurality of nozzle holes 18 arranged circumferentially on the outer peripheral surface B immediately adjacent to the intersection X of the head 16 are provided. It is open.

このような二段構造を取る理由は、機械的強度を確保しつつ適正な噴孔長さとするためである。すなわち、図２に示すように、ニードル２０の円錐面Ｃとニードル当接部１２の円錐状内壁面Ｄとが衝撃的に当接／離脱を行なうことにより燃料噴射弁の開閉を行なうので、ニードル当接部１２は機械的強度を確保するために大きい肉厚とする必要がある。   The reason for adopting such a two-stage structure is to obtain an appropriate nozzle hole length while ensuring mechanical strength. That is, as shown in FIG. 2, since the conical surface C of the needle 20 and the conical inner wall surface D of the needle contact portion 12 are contacted / disengaged impactively, the fuel injection valve is opened and closed. The contact portion 12 needs to have a large thickness in order to ensure mechanical strength.

一方、噴孔１８からは適度な噴霧角αで燃料ｆが噴射されるように、噴孔１８は適度な長さとする必要がある。噴孔１８の長さが大きいほど噴霧角αは小さくなって、細く直線的な噴射形状となるからである。したがって、必要な噴霧角αを確保するために、噴孔１８の長さには上限がある。噴孔１８の長さは噴孔１８が貫通する部位の肉厚で決まるため、その部位の肉厚は噴孔長さの上限値以内としなくてはならない。   On the other hand, the injection hole 18 needs to have an appropriate length so that the fuel f is injected from the injection hole 18 at an appropriate spray angle α. This is because the spray angle α becomes smaller as the length of the nozzle hole 18 becomes longer, resulting in a thin and linear injection shape. Therefore, there is an upper limit on the length of the nozzle hole 18 in order to ensure the necessary spray angle α. Since the length of the nozzle hole 18 is determined by the thickness of the portion through which the nozzle hole 18 penetrates, the thickness of the portion must be within the upper limit of the nozzle hole length.

このように、機械的強度と適正な噴孔長さとを同時に確保するために、ニードル当接部１２のうちで基部１４は肉厚を大きくして機械的強度を確保し、噴孔１８を設ける頭部１６は適正な噴孔長さに併せて薄い肉厚としている。   Thus, in order to ensure the mechanical strength and the appropriate nozzle hole length at the same time, the base part 14 of the needle contact part 12 is thickened to ensure the mechanical strength and the nozzle hole 18 is provided. The head 16 has a thin wall thickness in accordance with an appropriate nozzle hole length.

このように内向きコーナー状の交差部をニードル当接部の外形に有する燃料噴射弁の場合、この形状に特有の下記の問題が生じ、良好な滑落性能を安定して得られない。   Thus, in the case of a fuel injection valve having an inward corner-shaped intersection in the outer shape of the needle contact portion, the following problems peculiar to this shape occur, and good sliding performance cannot be stably obtained.

図３に、基部１４と頭部１６との交差部Ｘ付近の断面を拡大して示す。基部１４の外周面Ａに付着した油滴Ｍは、そのまま滑落、あるいは合体を繰り返して成長しつつ滑落する。この場合、滑落の駆動力ＲＡは撥油力ＦＡと重力によって生じている。   FIG. 3 shows an enlarged cross section near the intersection X between the base 14 and the head 16. The oil droplet M adhering to the outer peripheral surface A of the base portion 14 slides down as it is, or slides down while growing repeatedly. In this case, the sliding driving force RA is generated by the oil repellency FA and gravity.

油滴Ｍが内向きコーナー状の交差部Ｘに達すると、油滴Ｍには基部１４の外周面Ａからの撥油力ＦＡに加えて頭部１６の外周面Ｂからの撥油力ＦＢも作用する。ところがこの新たな撥油力ＦＢは撥油力ＦＡの作用方向と交差する向きに作用するため、滑落の駆動力ＲＸは撥油力ＦＢの作用により小さくなるため、油滴Ｍの滑落が妨げられ、停止させられる油滴もある。その結果滞留した油滴が熱変化してデポジットが発生してしまうという問題がある。   When the oil droplet M reaches the inward corner-shaped intersection X, the oil droplet M also has an oil repellency FB from the outer peripheral surface B of the head 16 in addition to an oil repellency FA from the outer peripheral surface A of the base 14. Works. However, since this new oil repellency FB acts in a direction crossing the direction of action of the oil repellency FA, the sliding drive force RX is reduced by the action of the oil repellency FB, so that the oil drop M is prevented from sliding down. Some oil drops are stopped. As a result, there is a problem that the accumulated oil droplets are thermally changed and deposits are generated.

特許第３３４０３７７号Japanese Patent No. 3340377 特開２００４−２１１８５１号公報JP 2004-211851 A 特開平０９−２１０５１３号公報JP 09-210513 A 特開２００４−０４４４５２号公報JP 2004-044452 A 特開２００３−０６５３３６号公報JP 2003-065336 A 特開２００４−２３９３４６号公報JP 2004-239346 A 実開昭６３−１５１９７０号公報Japanese Utility Model Publication No. 63-151970 特開平１０−２７４１３４号公報Japanese Patent Laid-Open No. 10-274134

本発明は、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備え、ニードル当接部の外形に内向きコーナー状の交差部を有する内燃機関用燃料噴射弁であって、燃料や潤滑油の液滴を噴孔近傍に滞留させず速やかに滑落させることができるように撥油性および表面形態を改良した内燃機関用燃料噴射弁を提供することを目的とする。   The present invention is a fuel injection valve for an internal combustion engine having an oil repellent coating of a PES / FEP composite type and having an inward corner-shaped intersection on the outer shape of a needle contact portion. It is an object of the present invention to provide a fuel injection valve for an internal combustion engine with improved oil repellency and surface morphology so that it can slide down quickly without staying in the vicinity of the injection hole.

請求項１に記載の発明によれば、金属基材の表面に撥油被膜を備え、該撥油被膜は、基材表面に密着したＰＥＳの下層と、該下層のＰＥＳと一体を成すＰＥＳの連続相中にＦＥＰの離散相が分散して成る上層とで構成され、該上層が該撥油被膜の表面として露出している内燃機関用燃料噴射弁であって、ボディーのニードル当接部の外形が、円錐台状の基部と該基部から突き出た頭部との二段構造であり、該基部の外周面と該頭部の外周面との交差部は内向きのコーナーとなっており、該頭部の交差部直近の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁において、前記基部の外周面から前記頭部の外周面へ滑落する油滴が前記交差部で滞留することなく速やかに滑落するように、前記交差部は１６０°以上の開き角を有して形成される、ことを特徴とする内燃機関用燃料噴射弁が提供される。   According to the first aspect of the present invention, an oil-repellent coating is provided on the surface of the metal substrate, and the oil-repellent coating is composed of a lower layer of PES that is in close contact with the surface of the substrate and a PES that is integrated with the lower layer of PES. A fuel injection valve for an internal combustion engine in which a discrete phase of FEP is dispersed in a continuous phase, and the upper layer is exposed as a surface of the oil repellent coating. The outer shape is a two-stage structure of a truncated cone-shaped base and a head protruding from the base, and the intersection of the outer peripheral surface of the base and the outer peripheral surface of the head is an inward corner, In a fuel injection valve for an internal combustion engine in which a plurality of injection holes arranged circumferentially are opened on an outer peripheral surface immediately adjacent to an intersection of the heads, the head slides from the outer peripheral surface of the base to the outer peripheral surface of the head. In order for oil droplets to slide down quickly without staying at the intersection, the intersection is at 160 ° or more. It is formed with a come corners, internal combustion engine fuel injector, wherein provided that.

請求項２に記載の発明によれば、前記交差部は１７０°以上の開き角を有して形成される、ことを特徴とする請求項１に記載の内燃機関の燃料噴射弁が提供される。   According to a second aspect of the present invention, there is provided the fuel injection valve for an internal combustion engine according to the first aspect, wherein the intersecting portion is formed with an opening angle of 170 ° or more. .

本発明者は、油滴滑落実験により、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備えた燃料噴射弁であって、噴孔が開口しているニードル当接部の外形に、内向きコーナーとなる交差部すなわち内向きコーナー状の交差部を有する燃料噴射弁においては、交差部の開き角が、交差部での油滴の滞留発生傾向に影響を与えることを突き止めた。そして、ガソリンの油滴の場合においては、交差部の開き角を１６０°以上とすることで、交差部における油滴の滞留を防止することができることを突き止めた。また、軽油の油滴の場合においては、交差部の開き角を１７０°以上とすることで、交差部における油滴の滞留を防止することができることを突き止めた。   The present inventor, based on an oil drop sliding experiment, is a fuel injection valve having a PES / FEP combined type oil-repellent coating, and has an inward corner on the outer shape of the needle contact portion where the nozzle hole is open. In a fuel injection valve having an intersecting portion, that is, an inward corner-shaped intersecting portion, it has been found that the opening angle of the intersecting portion affects the tendency of oil droplets to stay at the intersecting portion. And in the case of the oil drop of gasoline, it discovered that the retention of the oil drop in an intersection part can be prevented by making the opening angle of an intersection part into 160 degrees or more. Further, in the case of light oil droplets, it has been found that the retention of oil droplets at the intersection can be prevented by setting the opening angle of the intersection at 170 ° or more.

このことに基づいて、請求項１の発明では、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備え、ボディーのニードル当接部の外形が、円錐台状の基部と該基部から突き出た頭部との二段構造であり、該基部の外周面と該頭部の外周面との交差部は内向きのコーナーとなっており、該頭部の交差部直近の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁において、上記交差部が１６０°以上の開き角を有して形成される。   Based on this, the invention of claim 1 is provided with a PES / FEP composite type oil-repellent coating, and the outer shape of the needle contact portion of the body is a truncated cone-shaped base and a head protruding from the base. It has a two-stage structure, and the intersection between the outer peripheral surface of the base and the outer peripheral surface of the head is an inward corner, and is arranged circumferentially on the outer peripheral surface in the immediate vicinity of the intersection of the head In the fuel injection valve for an internal combustion engine in which a plurality of injection holes are opened, the intersecting portion is formed with an opening angle of 160 ° or more.

これにより、交差部における油滴の滞留を防止することができ、交差部直近の外周面に円周状に配列された噴孔を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   This prevents oil droplets from staying at the intersection and avoids the formation of deposits around the injection holes that close the circumferentially arranged injection holes on the outer peripheral surface in the immediate vicinity of the intersection. It becomes possible.

また、請求項２の発明では、上記交差部が１７０°以上の開き角を有して形成される。これにより、ガソリンの油滴の場合のみならず、軽油の油滴である場合においても、交差部における油滴の滞留を防止することができ、交差部直近の外周面に円周状に配列された噴孔を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   According to a second aspect of the present invention, the intersecting portion is formed with an opening angle of 170 ° or more. As a result, not only in the case of gasoline oil droplets, but also in the case of light oil oil droplets, oil droplets can be prevented from staying at the intersection, and arranged circumferentially on the outer peripheral surface in the immediate vicinity of the intersection. It is possible to avoid the formation of deposit around the nozzle hole that closes the nozzle hole.

請求項３に記載の発明によれば、前記交差部は、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される、ことを特徴とする請求項１または請求項２に記載の内燃機関用燃料噴射弁が提供される。   According to a third aspect of the present invention, the intersecting portion is formed by R-chamfering with a radius of curvature of 0.8 mm or more. A fuel injection valve is provided.

本発明者は、さらに油滴滑落実験により、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備えた燃料噴射弁であって、噴孔が開口しているニードル当接部の外形に、内向きコーナーとなる交差部すなわち内向きコーナー状の交差部を有する燃料噴射弁においては、交差部の開き角のみならず面取り形状もまた、交差部での油滴の滞留発生傾向に影響を与えることを突き止めた。そして、軽油の油滴の場合において、交差部が、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される場合には、交差部の開き角を１５５°以上とすることで交差部における油滴の滞留を防止することができることを突き止めた。   The present inventor further conducted an oil drop sliding experiment, which is a fuel injection valve provided with a PES / FEP combined type oil-repellent coating, and has an inward corner on the outer shape of the needle contact portion where the injection hole is open. In a fuel injection valve having a crossing portion, that is, an inward corner-shaped crossing portion, it has been found that not only the opening angle of the crossing portion but also the chamfered shape affects the tendency of oil droplets to stay at the crossing portion. . And in the case of light oil droplets, if the intersection is formed by R chamfering with a radius of curvature of 0.8 mm or more, the opening angle of the intersection is set to 155 ° or more at the intersection. It has been found that oil droplets can be prevented from staying.

このことに基づいて、請求項３の発明では、交差部が、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される。これにより、交差部の開き角が１６０°以上とされた場合においても、交差部におけるガソリンおよび軽油の両方の油滴に対する滞留の防止を図ることができ、交差部直近の外周面Ｂに円周状に配列された噴孔を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Based on this, in the invention of claim 3, the intersecting portion is formed by R chamfering having a radius of curvature of 0.8 mm or more. Thereby, even when the opening angle of the intersecting portion is set to 160 ° or more, it is possible to prevent retention of both gasoline and light oil droplets at the intersecting portion and It is possible to avoid the formation of deposits around the nozzle holes that close the nozzle holes arranged in a shape.

請求項４に記載の発明によれば、金属基材の表面に撥油被膜を備え、該撥油被膜は、基材表面に密着したＰＥＳの下層と、該下層のＰＥＳと一体を成すＰＥＳの連続相中にＦＥＰの離散相が分散して成る上層とで構成され、該上層が該撥油被膜の表面として露出している内燃機関用燃料噴射弁であって、ボディーのニードル当接部の外形が、基部と該基部から突き出た頭部との二段構造であり、該頭部の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁において、前記基部から前記頭部にわたる連続する外周面は複数の内向きコーナー状の交差部を有して形成され、前記基部の外周面から前記頭部の外周面へ滑落する油滴が前記内向きコーナー状の交差部で滞留することなく速やかに滑落するように、前記内向きコーナー状の交差部は１６０°以上の開き角を有して形成される、ことを特徴とする内燃機関用燃料噴射弁が提供される。   According to the invention described in claim 4, an oil repellent coating is provided on the surface of the metal substrate, and the oil repellent coating is composed of a lower layer of PES in close contact with the substrate surface and a PES integrated with the lower PES. A fuel injection valve for an internal combustion engine in which a discrete phase of FEP is dispersed in a continuous phase, and the upper layer is exposed as a surface of the oil repellent coating. In a fuel injection valve for an internal combustion engine, the outer shape is a two-stage structure of a base and a head protruding from the base, and a plurality of circumferentially arranged injection holes are opened on the outer peripheral surface of the head The continuous outer peripheral surface extending from the base to the head is formed with a plurality of inwardly-cornered intersections, and oil droplets sliding down from the outer peripheral surface of the base to the outer peripheral surface of the head are inward The inward direction so that it slides down quickly without staying at the corner-shaped intersection. Na-shaped cross section is formed with a opening angle of more than 160 °, an internal combustion engine fuel injector, wherein provided that.

すなわち、請求項４の発明では、ニードル当接部の基部から頭部にわたる連続する外周面が、複数の内向きコーナー状の交差部すなわち少なくとも２つ以上の内向きコーナー状の交差部を有して形成され、且つ、該内向きのコーナー状の交差部が１６０°以上の開き角を有して形成される。   That is, in the invention of claim 4, the continuous outer peripheral surface extending from the base portion to the head portion of the needle contact portion has a plurality of inward corner-shaped intersections, that is, at least two inward corner-shaped intersection portions. And the inward-cornered intersection is formed with an opening angle of 160 ° or more.

基部から頭部にわたる連続する外周面が複数の内向きコーナー状の交差部を有して形成されることで、基部から頭部にわたる連続する外周面が１つのみの内向きコーナー状の交差部を有して形成される場合と比較して、内向きコーナー状の交差部を、より大きな開き角で形成することが可能となる。   A continuous outer peripheral surface extending from the base to the head has a plurality of inward corner-shaped intersections, so that the continuous outer peripheral surface extending from the base to the head has only one inward corner-shaped intersection. Compared to the case of forming with an inward, it is possible to form an inward corner-shaped intersection with a larger opening angle.

また、請求項１と同様に、内向きのコーナー状の交差部を、１６０°以上の開き角を有して形成することで、交差部における油滴の滞留を防止することができ、噴孔を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Further, similarly to claim 1, by forming the inward corner-shaped intersection with an opening angle of 160 ° or more, oil droplets can be prevented from staying at the intersection, and the nozzle hole It is possible to avoid the formation of deposit around the nozzle hole that closes the nozzle.

請求項５に記載の発明によれば、前記内向きコーナー状の交差部は１７０°以上の開き角を有して形成される、ことを特徴とする請求項４に記載の内燃機関の燃料噴射弁が提供される。   According to a fifth aspect of the present invention, the fuel injection of the internal combustion engine according to the fourth aspect, wherein the inward corner-shaped intersection is formed with an opening angle of 170 ° or more. A valve is provided.

請求項６に記載の発明によれば、前記内向きコーナー状の交差部は、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される、ことを特徴とする請求項４または請求項５に記載の内燃機関用燃料噴射弁が提供される。   According to a sixth aspect of the present invention, the inward corner-shaped intersection is formed by R-chamfering with a radius of curvature of 0.8 mm or more. A fuel injection valve for an internal combustion engine as described in 1) is provided.

各請求項に記載の発明によれば、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備え、ニードル当接部の外形が、基部と該基部から突き出た頭部との二段構造であり、該頭部の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁であって、基部から頭部にわたる連続する外周面に内向きコーナー状の交差部を有する内燃機関用燃料噴射弁において、基部の外周面から頭部の外周面へ滑落する燃料や潤滑油の液滴すなわち油滴を内向きコーナー状の交差部で滞留させることなく速やかに滑落させることができ、噴孔周りのデポジットの形成を回避することが可能となる共通の効果を奏する。   According to the invention described in each claim, a PES / FEP composite type oil-repellent coating is provided, and the outer shape of the needle contact portion is a two-stage structure of a base and a head protruding from the base. A fuel injection valve for an internal combustion engine in which a plurality of injection holes arranged circumferentially are open on the outer peripheral surface of the part, and has an inward corner-shaped intersection on a continuous outer peripheral surface extending from the base to the head In a fuel injection valve for an internal combustion engine, fuel or lubricating oil droplets that slide from the outer peripheral surface of the base to the outer peripheral surface of the head, that is, oil droplets, can be quickly slid without staying at the inward corner-shaped intersection. It is possible to produce a common effect that makes it possible to avoid the formation of deposit around the nozzle hole.

以下、添付図面を用いて本発明の実施形態について説明する。
図４は、本発明に係る内燃機関用燃料噴射弁の第一の実施形態を説明するための断面図である。図示した燃料噴射弁１００は前述したＰＥＳ／ＦＥＰ複合型撥油被膜が外周面に施されている。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 4 is a cross-sectional view for explaining a first embodiment of a fuel injection valve for an internal combustion engine according to the present invention. The illustrated fuel injection valve 100 is provided with the aforementioned PES / FEP composite type oil repellent coating on the outer peripheral surface.

ボディーのニードル当接部１２の外形は、円錐台状の基部１４と該基部１４から突き出た頭部１６との二段構造であり、基部１４の外周面Ａと頭部１６の外周面Ｂとの交差部Ｘは内向きのコーナーとなっており、頭部１６の交差部Ｘ直近の外周面Ｂに円周状に配列された複数の噴孔１８が開口している。   The outer shape of the needle contact portion 12 of the body is a two-stage structure of a truncated cone-shaped base portion 14 and a head portion 16 projecting from the base portion 14, and an outer peripheral surface A of the base portion 14 and an outer peripheral surface B of the head portion 16. The intersection X is an inward corner, and a plurality of nozzle holes 18 arranged in a circle are opened on the outer peripheral surface B of the head 16 in the immediate vicinity of the intersection X.

本発明者は、ニードル当接部１２の外形に内向きコーナー状の交差部を有する燃料噴射弁において、基部１４の外周面Ａを滑落する油滴Ｍが交差部Ｘを超えて頭部１６の外周面Ｂを滑落続行できるか否かに対する、交差部Ｘの開き角θの影響を把握するために、ガソリンおよび軽油について種々の開き角θに対応した試料を用いて油滴滑落実験を行なった。   In the fuel injection valve having an inward corner-shaped intersection on the outer shape of the needle contact portion 12, the inventor has an oil droplet M that slides down the outer peripheral surface A of the base portion 14 beyond the intersection X and the head 16. In order to grasp the influence of the opening angle θ of the intersection X on whether or not the outer peripheral surface B can continue to slide down, oil drop sliding experiments were performed using samples corresponding to various opening angles θ for gasoline and light oil. .

図５は、行われた油滴滑落実験の概略図である。実験条件は下記のとおりであった。
〔撥油被膜条件〕
ＰＥＳ／ＦＥＰ比＝７０／３０
一次焼成：１８０℃×３０分
二次焼成：３５０℃×３０分
膜厚 ：９〜１０μｍ
〔供試媒体〕
ガソリン：市販レギュラー
軽油 ：市販油
〔試料条件〕
撥油被膜を施した平板（ステンレス製）を、曲げ半径を０．５ｍｍとし、種々の所定開き角θで折り曲げたものを試料とした。 FIG. 5 is a schematic diagram of an oil drop sliding experiment that was performed. The experimental conditions were as follows.
[Oil-repellent coating conditions]
PES / FEP ratio = 70/30
Primary firing: 180 ° C. × 30 minutes Secondary firing: 350 ° C. × 30 minutes Film thickness: 9-10 μm
[Test medium]
Gasoline: Commercial regular light oil: Commercial oil [Sample conditions]
Samples obtained by bending a flat plate (stainless steel) coated with an oil-repellent coating with a bending radius of 0.5 mm and various predetermined opening angles θ were used.

〔実験手順〕
マイクロシリンジ５μＬを用い、滴下法でラフサーベイを行なった。 [Experimental procedure]
A rough survey was performed by a dropping method using 5 μL of a microsyringe.

試験温度は２４℃であった。       The test temperature was 24 ° C.

試験結果を表１にまとめて示す。   The test results are summarized in Table 1.

Figure 2008064051
Figure 2008064051

表１から理解されるごとく、交差部の開き角θが小さいほど、油滴は、折り曲げ部すなわち交差部に滞留し易くなる。また、交差部で油滴が滞留せずに確実に滑落を続行するための開き角θの下限値は、ガソリンの場合は１６０°であり、軽油の場合は１７０°であった。このように、交差部での油滴の滞留発生傾向は交差部の開き角θの影響を受けることが判明した。   As understood from Table 1, the smaller the opening angle θ of the intersecting portion, the easier the oil droplets stay in the bent portion, that is, the intersecting portion. In addition, the lower limit value of the opening angle θ for reliably continuing sliding without oil droplets staying at the intersection was 160 ° for gasoline and 170 ° for light oil. Thus, it has been found that the tendency of the oil droplets to stay at the intersection is affected by the opening angle θ of the intersection.

このことに基づいて、図４に示される本発明に係る内燃機関用燃料噴射弁の第一の実施形態においては、基部１４の外周面Ａと頭部１６の外周面Ｂとの内向きコーナー状の交差部Ｘは、１６０°以上の開き角を有して形成される。これにより、少なくとも媒体がガソリンとされた場合において、交差部Ｘにおける油滴の滞留を防止することができ、交差部Ｘ直近の外周面Ｂに円周状に配列された噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Based on this, in the first embodiment of the fuel injection valve for an internal combustion engine according to the present invention shown in FIG. 4, an inward corner shape between the outer peripheral surface A of the base portion 14 and the outer peripheral surface B of the head portion 16. The crossing portion X is formed with an opening angle of 160 ° or more. Accordingly, at least when the medium is gasoline, oil droplets can be prevented from staying at the intersection X, and the nozzle holes 18 arranged circumferentially on the outer peripheral surface B immediately adjacent to the intersection X are closed. It is possible to avoid the formation of deposit around the nozzle hole.

ＰＥＳ／ＦＥＰ複合型撥油被膜が外周面に施されていない燃料噴射弁において、そもそも油滴が形成されることがなく全面濡れ状態であったので、基部１４の外周面Ａと頭部１６の外周面Ｂとの内向きコーナー状の交差部を１６０°以上の開き角を有して形成してもなんら効果はない。交差部Ｘにおける油滴の滞留によるデポジットの生成という問題は、ＰＥＳ／ＦＥＰ複合型撥油被膜を用いた場合に特有の新規な課題である。   In the fuel injection valve in which the PES / FEP composite type oil repellent coating is not applied to the outer peripheral surface, oil droplets are not formed in the first place, and the entire surface is wet. Even if an inward corner-shaped intersection with the outer peripheral surface B is formed with an opening angle of 160 ° or more, there is no effect. The problem of deposit formation due to the stay of oil droplets at the intersection X is a new problem peculiar to the case where a PES / FEP composite type oil repellent coating is used.

尚、基部１４の外周面Ａと頭部１６の外周面Ｂとの内向きコーナー状の交差部は、図４に示す第一の実施形態においては、１６０°以上の開き角を有して形成されるものとされているが、１７０°以上の開き角を有して形成されるものとされてもよい。この場合には、媒体がガソリンである場合のみならず、軽油である場合においても、交差部Ｘにおける油滴の滞留を確実に防止することができ、交差部Ｘ直近の外周面Ｂに円周状に配列された噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   In addition, the inward corner-shaped intersection between the outer peripheral surface A of the base portion 14 and the outer peripheral surface B of the head portion 16 is formed with an opening angle of 160 ° or more in the first embodiment shown in FIG. However, it may be formed with an opening angle of 170 ° or more. In this case, not only when the medium is gasoline, but also when the medium is light oil, oil droplets can be reliably prevented from staying at the intersection X, and the circumference of the outer peripheral surface B immediately adjacent to the intersection X is circumferential. It is possible to avoid the formation of deposits around the nozzle holes that close the nozzle holes 18 arranged in a shape.

更に、本発明者は、ニードル当接部１２の外形に内向きコーナー状の交差部を有する燃料噴射弁において、基部１４の外周面Ａを滑落する油滴が交差部Ｘを超えて頭部１６の外周面Ｂに滑落続行できるか否かに対する、内向きコーナー状の交差部Ｘの面取り形状の影響を把握するために、軽油の油滴について種々の面取り形状に対応した試料を用いて油滴滑落実験を行なった。   Furthermore, in the fuel injection valve having an inward corner-shaped intersection at the outer shape of the needle contact portion 12, the inventor has oil droplets that slide down the outer peripheral surface A of the base portion 14 beyond the intersection X and the head 16. In order to grasp the influence of the chamfering shape of the inward corner-shaped intersection X on whether or not it can continue to slide down on the outer peripheral surface B of the oil oil droplets using samples corresponding to various chamfering shapes of light oil oil droplets A sliding test was conducted.

該油滴滑落実験の概観は図５に示された概観と同様である。また、実験条件は下記のとおりであった。
〔撥油被膜条件〕
ＰＥＳ／ＦＥＰ比＝７０／３０
一次焼成：１８０℃×３０分
二次焼成：３５０℃×３０分
膜厚 ：９〜１０μｍ
〔供試媒体〕
軽油 ：市販油
〔試料条件〕
撥油被膜を施した平板（ステンレス製）を、曲げ半径を種々の所定値とし、種々の所定開き角θで折り曲げたものを試料とした。 The appearance of the oil drop sliding experiment is the same as that shown in FIG. The experimental conditions were as follows.
[Oil-repellent coating conditions]
PES / FEP ratio = 70/30
Primary firing: 180 ° C. × 30 minutes Secondary firing: 350 ° C. × 30 minutes Film thickness: 9-10 μm
[Test medium]
Light oil: Commercial oil [Sample conditions]
Samples obtained by bending a flat plate (stainless steel) coated with an oil-repellent coating with various predetermined radii and various predetermined opening angles θ were used.

〔実験手順〕
マイクロシリンジ５μＬを用い、滴下法でラフサーベイを行なった。 [Experimental procedure]
A rough survey was performed by a dropping method using 5 μL of a microsyringe.

試験温度は２４℃であった。       The test temperature was 24 ° C.

試験結果を表２にまとめて示す。   The test results are summarized in Table 2.

Figure 2008064051
Figure 2008064051

表２から理解されるごとく、曲げ半径が０．５ｍｍの場合、油滴を交差部で滞留させることなく滑落させるためには、交差部の開き角を１７０°以上にしなければならない。しかしながら、曲げ半径を０．８ｍｍ以上とする場合には、交差部の開き角を１５５°以上とすることで油滴を交差部で滞留させることなく滑落させることができる。このように、交差部における油滴の滞留発生傾向は交差部の開き角θのみならず交差部の面取り形状の影響をも受けることが判明した。   As understood from Table 2, when the bend radius is 0.5 mm, the opening angle of the intersecting portion must be 170 ° or more in order to allow the oil droplet to slide down without staying at the intersecting portion. However, when the bend radius is 0.8 mm or more, by setting the opening angle of the intersecting portion to 155 ° or more, oil droplets can be slid down without staying at the intersecting portion. Thus, it has been found that the tendency of oil droplets to stay at the intersection is affected not only by the opening angle θ of the intersection, but also by the chamfered shape of the intersection.

このことに基づいて、図４に示される本発明に係る内燃機関用燃料噴射弁の第一の実施形態においては、基部１４の外周面Ａと頭部１６の外周面Ｂとの内向きコーナー状の交差部Ｘは、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される。これにより、媒体がガソリンの場合においても、また、媒体が軽油の場合においても、より確実に、交差部Ｘにおける油滴の滞留を防止することができ、交差部Ｘ直近の外周面Ｂに円周状に配列された噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Based on this, in the first embodiment of the fuel injection valve for an internal combustion engine according to the present invention shown in FIG. 4, an inward corner shape between the outer peripheral surface A of the base portion 14 and the outer peripheral surface B of the head portion 16. The intersection X is formed by R-chamfering with a radius of curvature of 0.8 mm or more. Thereby, even when the medium is gasoline or when the medium is light oil, oil droplets can be more reliably prevented from staying at the intersection X, and a circle is formed on the outer peripheral surface B immediately adjacent to the intersection X. It is possible to avoid the formation of deposits around the injection holes that close the injection holes 18 arranged in a circumferential shape.

次に、図６を参照して、本発明に係る内燃機関用燃料噴射弁の二実施形態を説明する。図６は、本発明に係る内燃機関用燃料噴射弁の第二の実施形態を説明するための外観図である。   Next, with reference to FIG. 6, two embodiment of the fuel injection valve for internal combustion engines which concerns on this invention is described. FIG. 6 is an external view for explaining a second embodiment of a fuel injection valve for an internal combustion engine according to the present invention.

図６に示した燃料噴射弁２００は前述したＰＥＳ／ＦＥＰ複合型撥油被膜が外周面に施されている。また、ボディーのニードル当接部１２の外形は、基部１４と該基部１４から突き出た頭部１６との二段構造であり、該頭部１６の外周面に円周状に配列された複数の噴孔１８が開口している。   The fuel injection valve 200 shown in FIG. 6 is provided with the aforementioned PES / FEP combined type oil repellent coating on the outer peripheral surface. Further, the outer shape of the needle contact portion 12 of the body is a two-stage structure including a base portion 14 and a head portion 16 protruding from the base portion 14, and a plurality of circumferentially arranged outer peripheral surfaces of the head portion 16. The nozzle hole 18 is open.

図６に示した本発明の第二の実施形態の内燃機関用燃料噴射弁においては、基部１４から頭部１６にわたる連続する外周面が、少なくとも二つ以上の複数の内向きコーナー状の交差部Ｘを有して形成され、且つ、該内向きのコーナー状の交差部Ｘが１６０°以上の開き角θを有して形成される。   In the fuel injection valve for the internal combustion engine according to the second embodiment of the present invention shown in FIG. 6, the continuous outer peripheral surface extending from the base portion 14 to the head portion 16 has at least two or more inward corner-shaped intersections. X is formed, and the inward-cornered intersection X is formed with an opening angle θ of 160 ° or more.

基部１４から頭部１６にわたる連続する外周面が少なくとも二つ以上の複数の内向きコーナー状の交差部Ｘを有して形成されることで、基部１４から頭部１６にわたる連続する外周面が１つのみの内向きコーナー状の交差部Ｘを有して形成される場合と比較して、内向きコーナー状の交差部Ｘを、より大きな開き角で形成することが可能となる。   The continuous outer peripheral surface extending from the base portion 14 to the head portion 16 is formed having at least two or more inward corner-shaped intersections X, so that the continuous outer peripheral surface extending from the base portion 14 to the head portion 16 is one. Compared to the case where only one inward-cornered intersection X is formed, the inward-cornered intersection X can be formed with a larger opening angle.

また、上述した油滴滑落実験の結果に基づいて、該内向きのコーナー状の交差部Ｘを、１６０°以上の開き角を有して形成することで、交差部Ｘにおける油滴の滞留を防止することができ、噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Further, based on the result of the oil drop sliding test described above, the inward corner-shaped intersection portion X is formed with an opening angle of 160 ° or more, so that oil droplets stay in the intersection portion X. It is possible to prevent the formation of deposits around the nozzle holes that close the nozzle holes 18.

更に、図６に示した本発明の第二の実施形態の内燃機関用燃料噴射弁においては、上述した油滴滑落実験に基づいて、内向きコーナー状の交差部Ｘは、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される。   Further, in the fuel injection valve for the internal combustion engine of the second embodiment of the present invention shown in FIG. 6, the inward corner-shaped intersection X has a radius of curvature of 0. 0 based on the oil drop sliding test described above. R chamfering of 8 mm or more is made.

これにより、媒体がガソリンの場合においても、また、媒体が軽油の場合においても、より確実に、交差部Ｘにおける油滴の滞留を防止することができ、噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   Thereby, even when the medium is gasoline or when the medium is light oil, the accumulation of oil droplets at the intersection X can be more reliably prevented, and the injection hole that closes the injection hole 18. It is possible to avoid the formation of surrounding deposits.

尚、内向きコーナー状の交差部Ｘは、図６に示す第二の実施形態においては、１６０°以上の開き角を有して形成されるものとされているが、１７０°以上の開き角を有して形成されるものとされてもよい。この場合には、媒体がガソリンである場合のみならず軽油である場合においても、より確実に、交差部Ｘにおける油滴の滞留を防止することができ、噴孔１８を閉鎖するような噴孔周りのデポジットの形成を回避することが可能となる。   In addition, in the second embodiment shown in FIG. 6, the inward corner-shaped intersection X is formed with an opening angle of 160 ° or more, but an opening angle of 170 ° or more. May be formed. In this case, not only when the medium is gasoline but also when it is light oil, it is possible to more reliably prevent oil droplets from staying at the intersection X, and the injection hole that closes the injection hole 18. It is possible to avoid the formation of surrounding deposits.

以上、本発明によれば、ＰＥＳ／ＦＥＰ複合型の撥油被膜を備え、ニードル当接部の外形に内向きコーナー状の交差部を有する内燃機関用燃料噴射弁であって、油滴を噴孔近傍に滞留させず速やかに滑落させることができるように撥油性および表面形態を改良した内燃機関用燃料噴射弁が提供される。   As described above, according to the present invention, there is provided a fuel injection valve for an internal combustion engine having a PES / FEP combined type oil-repellent coating and having an inward corner-shaped intersection on the outer shape of the needle contact portion. Provided is a fuel injection valve for an internal combustion engine that has improved oil repellency and surface morphology so that it can be quickly slid down without staying in the vicinity of the hole.

本発明の対象とする内燃機関用燃料噴射弁のニードル当接部付近を示す側面図である。It is a side view which shows the needle contact part vicinity of the fuel injection valve for internal combustion engines made into the object of this invention. 本発明の対象とする内燃機関用燃料噴射弁のニードル当接部付近を示す断面図である。It is sectional drawing which shows the needle contact part vicinity of the fuel injection valve for internal combustion engines made into the object of this invention. 図１、図２に示した内燃機関用燃料噴射弁のニードル当接部外周面の交差部付近における滑落油滴の挙動を示す拡大断面図である。FIG. 3 is an enlarged cross-sectional view showing the behavior of sliding oil droplets in the vicinity of the intersection of the outer peripheral surface of the needle contact portion of the fuel injection valve for the internal combustion engine shown in FIGS. 1 and 2. 本発明に係る内燃機関用燃料噴射弁の第一の実施形態を説明するための断面図である。It is sectional drawing for demonstrating 1st embodiment of the fuel injection valve for internal combustion engines which concerns on this invention. 油滴滑落実験の概略図である。It is the schematic of an oil-drop sliding experiment. 本発明に係る内燃機関用燃料噴射弁の第二の実施形態を説明するための外観図である。It is an external view for demonstrating 2nd embodiment of the fuel injection valve for internal combustion engines which concerns on this invention.

符号の説明Explanation of symbols

１０ ボディー
１２ ニードル当接部
１４ 基部
１６ 頭部
１８ 噴孔
２０ ニードル
１００、２００ 燃料噴射弁
Ａ、Ｂ 外周面
Ｍ 油滴
ＦＡ、ＦＢ 撥油力
ＲＡ、ＲＸ 滑落の駆動力
Ｘ 交差部 DESCRIPTION OF SYMBOLS 10 Body 12 Needle contact part 14 Base 16 Head 18 Injection hole 20 Needle 100, 200 Fuel injection valve A, B Outer peripheral surface M Oil droplet FA, FB Oil repellency RA, RX Driving force X Crossing part

Claims (6)

金属基材の表面に撥油被膜を備え、該撥油被膜は、基材表面に密着したＰＥＳの下層と、該下層のＰＥＳと一体を成すＰＥＳの連続相中にＦＥＰの離散相が分散して成る上層とで構成され、該上層が該撥油被膜の表面として露出している内燃機関用燃料噴射弁であって、
ボディーのニードル当接部の外形が、円錐台状の基部と該基部から突き出た頭部との二段構造であり、該基部の外周面と該頭部の外周面との交差部は内向きのコーナーとなっており、該頭部の交差部直近の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁において、
前記基部の外周面から前記頭部の外周面へ滑落する油滴が前記交差部で滞留することなく速やかに滑落するように、前記交差部は１６０°以上の開き角を有して形成される、ことを特徴とする内燃機関用燃料噴射弁。 An oil-repellent coating is provided on the surface of the metal substrate, and the oil-repellent coating has an FEP discrete phase dispersed in a lower layer of PES in close contact with the surface of the substrate and a continuous phase of PES integrated with the lower layer PES. A fuel injection valve for an internal combustion engine, wherein the upper layer is exposed as a surface of the oil repellent coating,
The outer shape of the needle contact portion of the body is a two-stage structure with a truncated cone-shaped base and a head protruding from the base, and the intersection of the outer peripheral surface of the base and the outer peripheral surface of the head is inward In the fuel injection valve for an internal combustion engine in which a plurality of injection holes arranged circumferentially are opened on the outer peripheral surface in the immediate vicinity of the intersection of the heads,
The intersecting portion is formed with an opening angle of 160 ° or more so that oil droplets that slide from the outer peripheral surface of the base portion to the outer peripheral surface of the head quickly slide down without staying at the intersecting portion. A fuel injection valve for an internal combustion engine. 前記交差部は１７０°以上の開き角を有して形成される、ことを特徴とする請求項１に記載の内燃機関用燃料噴射弁。   2. The fuel injection valve for an internal combustion engine according to claim 1, wherein the intersecting portion is formed with an opening angle of 170 [deg.] Or more. 前記交差部は、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される、ことを特徴とする請求項１または請求項２に記載の内燃機関用燃料噴射弁。   3. The fuel injection valve for an internal combustion engine according to claim 1, wherein the intersecting portion is formed by R chamfering having a curvature radius of 0.8 mm or more. 金属基材の表面に撥油被膜を備え、該撥油被膜は、基材表面に密着したＰＥＳの下層と、該下層のＰＥＳと一体を成すＰＥＳの連続相中にＦＥＰの離散相が分散して成る上層とで構成され、該上層が該撥油被膜の表面として露出している内燃機関用燃料噴射弁であって、
ボディーのニードル当接部の外形が、基部と該基部から突き出た頭部との二段構造であり、該頭部の外周面に円周状に配列された複数の噴孔が開口している内燃機関用燃料噴射弁において、
前記基部から前記頭部にわたる連続する外周面は複数の内向きコーナー状の交差部を有して形成され、前記基部の外周面から前記頭部の外周面へ滑落する油滴が前記内向きコーナー状の交差部で滞留することなく速やかに滑落するように、前記内向きコーナー状の交差部は１６０°以上の開き角を有して形成される、ことを特徴とする内燃機関用燃料噴射弁。 An oil-repellent coating is provided on the surface of the metal substrate, and the oil-repellent coating has an FEP discrete phase dispersed in a lower layer of PES in close contact with the surface of the substrate and a continuous phase of PES integrated with the lower layer PES. A fuel injection valve for an internal combustion engine, wherein the upper layer is exposed as a surface of the oil repellent coating,
The outer shape of the needle contact portion of the body is a two-stage structure of a base and a head protruding from the base, and a plurality of nozzle holes arranged circumferentially are opened on the outer peripheral surface of the head In a fuel injection valve for an internal combustion engine,
A continuous outer peripheral surface extending from the base to the head is formed with a plurality of inward corner-shaped intersections, and an oil droplet sliding down from the outer peripheral surface of the base to the outer peripheral surface of the head is the inward corner. A fuel injection valve for an internal combustion engine, wherein the inwardly cornered intersection is formed with an opening angle of 160 ° or more so as to slide down quickly without staying at the intersection. . 前記内向きコーナー状の交差部は１７０°以上の開き角を有して形成される、ことを特徴とする請求項４に記載の内燃機関用燃料噴射弁。   5. The fuel injection valve for an internal combustion engine according to claim 4, wherein the inward-cornered intersection is formed with an opening angle of 170 ° or more. 前記内向きコーナー状の交差部は、曲率半径が０．８ｍｍ以上のＲ面取りがなされて形成される、ことを特徴とする請求項４または請求項５に記載の内燃機関用燃料噴射弁。   6. The fuel injection valve for an internal combustion engine according to claim 4, wherein the inward corner-shaped intersection is formed by R chamfering having a radius of curvature of 0.8 mm or more.
JP2006244099A 2006-09-08 2006-09-08 Fuel injection valve for internal combustion engine with oil-repellent coating Pending JP2008064051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006244099A JP2008064051A (en) 2006-09-08 2006-09-08 Fuel injection valve for internal combustion engine with oil-repellent coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006244099A JP2008064051A (en) 2006-09-08 2006-09-08 Fuel injection valve for internal combustion engine with oil-repellent coating

Publications (1)

Publication Number Publication Date
JP2008064051A true JP2008064051A (en) 2008-03-21

Family

ID=39286971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006244099A Pending JP2008064051A (en) 2006-09-08 2006-09-08 Fuel injection valve for internal combustion engine with oil-repellent coating

Country Status (1)

Country Link
JP (1) JP2008064051A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015086748A (en) * 2013-10-29 2015-05-07 株式会社デンソー Fuel injection valve

Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123836A (en) * 1974-08-20 1976-02-26 Noritsu Kk TOKETSUANZENSOCHI
JPS6123836A (en) * 1984-07-10 1986-02-01 Toyota Motor Corp Fuel injection controller
JPS6264867U (en) * 1985-10-12 1987-04-22
JPS63151970U (en) * 1987-03-27 1988-10-05
JPH03117674A (en) * 1989-09-29 1991-05-20 Hino Motors Ltd Fuel injection device
JPH03138448A (en) * 1989-10-23 1991-06-12 Mitsubishi Heavy Ind Ltd Unit injector
JPH03149345A (en) * 1989-11-01 1991-06-25 Hino Motors Ltd Fuel injection nozzle
JPH058347A (en) * 1991-07-03 1993-01-19 Yodogawa Steel Works Ltd Heat-resistant precoated metal sheet
JPH0544596A (en) * 1991-08-08 1993-02-23 Yanmar Diesel Engine Co Ltd Fuel injection valve of auxiliary chamber type diesel engine
JPH06237861A (en) * 1993-02-17 1994-08-30 Matsushita Electric Ind Co Ltd Electric boiler
JPH09126096A (en) * 1995-11-06 1997-05-13 Hino Motors Ltd Fuel injection device
JPH09210513A (en) * 1996-02-07 1997-08-12 Denso Corp Refrigration cycle
JPH09305043A (en) * 1996-05-10 1997-11-28 Canon Inc Heating device and image forming device
JPH10161471A (en) * 1996-12-05 1998-06-19 Canon Inc Heating device and image forming device
JPH10274134A (en) * 1997-03-28 1998-10-13 Zexel Corp Fuel injection valve
JP2002004984A (en) * 2000-06-27 2002-01-09 Aisan Ind Co Ltd Manufacturing method of coating holder in pore
JP2002084499A (en) * 2000-09-08 2002-03-22 Canon Inc Device and method for recording/reproducing image and computer-readable storage medium
JP3340377B2 (en) * 1998-03-17 2002-11-05 株式会社日立製作所 Article having surface where hydrophilic part and super water repellent part coexist, method for manufacturing the same, and printing apparatus using the same
JP2003049751A (en) * 2001-08-06 2003-02-21 Toyota Motor Corp Fuel injection valve
JP2003056431A (en) * 2001-08-21 2003-02-26 Toyota Motor Corp Fuel injection nozzle tip portion durability improving method
JP2003065336A (en) * 2001-08-24 2003-03-05 Matsushita Electric Ind Co Ltd Hydraulic bearing
JP2004044452A (en) * 2002-07-10 2004-02-12 Ishikawajima Harima Heavy Ind Co Ltd Supercharger
JP2004204702A (en) * 2002-12-24 2004-07-22 Bosch Automotive Systems Corp Fuel injection nozzle
JP2004211851A (en) * 2003-01-07 2004-07-29 Minebea Co Ltd Dynamic pressure bearing device forming oil repellent film thereto and spindle motor for hard disk drive mounting the same
JP2004239346A (en) * 2003-02-06 2004-08-26 Nippon Densan Corp Fluid dynamic pressure bearing, motor with the same, and disk drive device with the motor
JP2004330664A (en) * 2003-05-09 2004-11-25 Hitachi Ltd Article with water-repellent film and its manufacturing method
JP2005299642A (en) * 2004-03-17 2005-10-27 Denso Corp Fuel injection nozzle
JP2006045490A (en) * 2004-06-30 2006-02-16 Daikin Ind Ltd Water base paint composition
JP2006132353A (en) * 2004-11-02 2006-05-25 Denso Corp Fuel injection valve
JP2006192356A (en) * 2005-01-12 2006-07-27 Nippon Futsuso Kogyo Kk Primer layer and paint composition
JP2006220072A (en) * 2005-02-10 2006-08-24 Denso Corp Fuel injection valve
WO2006123840A1 (en) * 2005-05-20 2006-11-23 Toyota Jidosha Kabushiki Kaisha Parts with oil-repellent layers and process for production thereof
JP2006328973A (en) * 2005-05-23 2006-12-07 Toyota Motor Corp Fuel injection valve for internal combustion engine equipped with oil repellent coating

Patent Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123836A (en) * 1974-08-20 1976-02-26 Noritsu Kk TOKETSUANZENSOCHI
JPS6123836A (en) * 1984-07-10 1986-02-01 Toyota Motor Corp Fuel injection controller
JPS6264867U (en) * 1985-10-12 1987-04-22
JPS63151970U (en) * 1987-03-27 1988-10-05
JPH03117674A (en) * 1989-09-29 1991-05-20 Hino Motors Ltd Fuel injection device
JPH03138448A (en) * 1989-10-23 1991-06-12 Mitsubishi Heavy Ind Ltd Unit injector
JPH03149345A (en) * 1989-11-01 1991-06-25 Hino Motors Ltd Fuel injection nozzle
JPH058347A (en) * 1991-07-03 1993-01-19 Yodogawa Steel Works Ltd Heat-resistant precoated metal sheet
JPH0544596A (en) * 1991-08-08 1993-02-23 Yanmar Diesel Engine Co Ltd Fuel injection valve of auxiliary chamber type diesel engine
JPH06237861A (en) * 1993-02-17 1994-08-30 Matsushita Electric Ind Co Ltd Electric boiler
JPH09126096A (en) * 1995-11-06 1997-05-13 Hino Motors Ltd Fuel injection device
JPH09210513A (en) * 1996-02-07 1997-08-12 Denso Corp Refrigration cycle
JPH09305043A (en) * 1996-05-10 1997-11-28 Canon Inc Heating device and image forming device
JPH10161471A (en) * 1996-12-05 1998-06-19 Canon Inc Heating device and image forming device
JPH10274134A (en) * 1997-03-28 1998-10-13 Zexel Corp Fuel injection valve
JP3340377B2 (en) * 1998-03-17 2002-11-05 株式会社日立製作所 Article having surface where hydrophilic part and super water repellent part coexist, method for manufacturing the same, and printing apparatus using the same
JP2002004984A (en) * 2000-06-27 2002-01-09 Aisan Ind Co Ltd Manufacturing method of coating holder in pore
JP2002084499A (en) * 2000-09-08 2002-03-22 Canon Inc Device and method for recording/reproducing image and computer-readable storage medium
JP2003049751A (en) * 2001-08-06 2003-02-21 Toyota Motor Corp Fuel injection valve
JP2003056431A (en) * 2001-08-21 2003-02-26 Toyota Motor Corp Fuel injection nozzle tip portion durability improving method
JP2003065336A (en) * 2001-08-24 2003-03-05 Matsushita Electric Ind Co Ltd Hydraulic bearing
JP2004044452A (en) * 2002-07-10 2004-02-12 Ishikawajima Harima Heavy Ind Co Ltd Supercharger
JP2004204702A (en) * 2002-12-24 2004-07-22 Bosch Automotive Systems Corp Fuel injection nozzle
JP2004211851A (en) * 2003-01-07 2004-07-29 Minebea Co Ltd Dynamic pressure bearing device forming oil repellent film thereto and spindle motor for hard disk drive mounting the same
JP2004239346A (en) * 2003-02-06 2004-08-26 Nippon Densan Corp Fluid dynamic pressure bearing, motor with the same, and disk drive device with the motor
JP2004330664A (en) * 2003-05-09 2004-11-25 Hitachi Ltd Article with water-repellent film and its manufacturing method
JP2005299642A (en) * 2004-03-17 2005-10-27 Denso Corp Fuel injection nozzle
JP2006045490A (en) * 2004-06-30 2006-02-16 Daikin Ind Ltd Water base paint composition
JP2006132353A (en) * 2004-11-02 2006-05-25 Denso Corp Fuel injection valve
JP2006192356A (en) * 2005-01-12 2006-07-27 Nippon Futsuso Kogyo Kk Primer layer and paint composition
JP2006220072A (en) * 2005-02-10 2006-08-24 Denso Corp Fuel injection valve
WO2006123840A1 (en) * 2005-05-20 2006-11-23 Toyota Jidosha Kabushiki Kaisha Parts with oil-repellent layers and process for production thereof
JP2006328973A (en) * 2005-05-23 2006-12-07 Toyota Motor Corp Fuel injection valve for internal combustion engine equipped with oil repellent coating

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015086748A (en) * 2013-10-29 2015-05-07 株式会社デンソー Fuel injection valve

Similar Documents

Publication Publication Date Title
US7373951B2 (en) Control valve having “C” seal
US7287459B2 (en) Piston for internal combustion engine
KR102357624B1 (en) Ultra-seal gasket for joining high purity fluid pathways
JP2014001732A (en) Coating with nonconstant thickness for cylinder liner
JP3324980B2 (en) Assembling method of piston ring structure
JP2007009765A (en) Fuel injection valve for internal combustion engine
JP2008064051A (en) Fuel injection valve for internal combustion engine with oil-repellent coating
JP4363363B2 (en) Fuel injection valve for internal combustion engine with oil repellent coating
JP2007321592A (en) Fuel injection valve
JP2006046655A (en) Valve rod seal assembly
JP6765318B2 (en) Fuel injection device
WO2017126259A1 (en) Fuel injection valve
WO2015170588A1 (en) Fuel injection valve
JP6121870B2 (en) Atomization technology for fuel injectors
JP2009228793A (en) Cage for ball bearing and method for manufacturing the same
JP2014098471A (en) Pressure ring mounted piston
JP2008038630A (en) Flow passage arranging member of internal combustion engine
JP2008101776A (en) Sealing device
JP2003056431A (en) Fuel injection nozzle tip portion durability improving method
JP2017145909A (en) Valve stem seal and sealing structure
JP3176727U (en) Oil return passage structure for internal combustion engine
JP6527763B2 (en) Fuel injection valve
JP2012047116A (en) Fuel injection valve
JP6860328B2 (en) Pressure ring for internal combustion engine piston
JP6650390B2 (en) Intake valve for internal combustion engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080917

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100226

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100601

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20101102