JP2009275535A - Injector for gaseous fuel - Google Patents

Injector for gaseous fuel Download PDF

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Publication number
JP2009275535A
JP2009275535A JP2008125388A JP2008125388A JP2009275535A JP 2009275535 A JP2009275535 A JP 2009275535A JP 2008125388 A JP2008125388 A JP 2008125388A JP 2008125388 A JP2008125388 A JP 2008125388A JP 2009275535 A JP2009275535 A JP 2009275535A
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Japan
Prior art keywords
injector
coating layer
sheet
fluororesin
fuel
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Pending
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JP2008125388A
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Japanese (ja)
Inventor
Ryota Nakamura
良太 中村
Hiromasa Ono
博正 大野
Tomoaki Fukuoka
智昭 福岡
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Nikki Co Ltd
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Nikki Co Ltd
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Priority to JP2008125388A priority Critical patent/JP2009275535A/en
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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

Abstract

<P>PROBLEM TO BE SOLVED: To exert excellent responsiveness by making contact and peeling properties better by avoiding a sticking phenomenon of a coating layer by fluororesin applied to an action surface of an injector valve element generated by plasticizer eluted to fuel from a fuel hose, etc. and a metal injector sheet. <P>SOLUTION: This injector has the injector body 1 arranged with a closely contacting member having the fluororesin coating layer 5 on a surface of a base material 2 formed by an elastic material on the action surface and a valve seat 3 having the injector sheet 4 contacting/separating with/from the injector body 1. A coating layer 15 made of Ni-P plating containing fluororesin particles is applied to a surface of the injector sheet 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ＬＰＧなどの気体燃料を内燃機関の吸気通路に噴射するインジェクタに関するものである。   The present invention relates to an injector that injects gaseous fuel such as LPG into an intake passage of an internal combustion engine.

従来、ＬＰＧなどの気体燃料を用いた内燃機関において吸気通路に所定量の燃料ガスを所定の間隔で連続して噴射するインジェクタは、燃料ガスを遮断する必要性から図２に示したように、インジェクタ弁体１の作用面にゴムや合成樹脂などの弾性材により形成された基材２が設けられており、更に、対向する弁座３のインジェクタシート４への密着性や剥離性を向上させる目的でフッ素樹脂によるコーティング層５が形成されており、例えば特開２００７−２０５２１６号公報などに提示されている。   2. Description of the Related Art Conventionally, an injector that continuously injects a predetermined amount of fuel gas into an intake passage at a predetermined interval in an internal combustion engine using a gaseous fuel such as LPG, as shown in FIG. A base material 2 made of an elastic material such as rubber or synthetic resin is provided on the working surface of the injector valve body 1 and further improves the adhesion and peelability of the opposing valve seat 3 to the injector seat 4. For the purpose, a coating layer 5 made of a fluororesin is formed, which is presented in, for example, Japanese Patent Application Laid-Open No. 2007-205216.

ところが、インジェクタに燃料を供給する燃料管路に用いられるゴム製のホースには可塑剤が含有されており、この可塑剤が燃料に溶解して前記フッ素樹脂のコーティング層５の密着に使用されるバインダ樹脂と反応し膨潤を引き起こす場合があり、インジェクタ弁体１の粘着性が増加してインジェクタ弁体１と表面処理を施していないステンレスなどの金属製のインジェクタシート３との間で貼り付きが生じやすい状態になり、開弁作用に影響を与えてエンジン始動の不良や運転性の悪化などの弊害を生じることになる。特に、新品のホースには多量の可塑剤が含まれており影響が著しい。   However, a rubber hose used for a fuel pipe for supplying fuel to the injector contains a plasticizer, and this plasticizer dissolves in the fuel and is used for the adhesion of the coating layer 5 of the fluororesin. It may react with the binder resin to cause swelling, and the stickiness between the injector valve element 1 and a metal injector sheet 3 made of stainless steel or the like that has not been surface-treated is increased due to an increase in the adhesiveness of the injector valve element 1. This is likely to occur, which affects the valve opening action and causes problems such as poor engine start-up and poor operability. In particular, a new hose contains a large amount of plasticizer and has a significant effect.

また、例えば、貼り付き防止と耐久性の付与が可能な複数種類のバインダ樹脂を配合したものを使用することも考えられるが、可塑剤を燃料に溶解させるゴム製のホースも新品のときとその後とでは可塑剤の溶出量が変化するので配合比率を変化させたとしても使用条件が異なるので高いレベルで対応させることは困難である。
特開２００７−２０５２１６号公報 In addition, for example, it may be possible to use a mixture of a plurality of types of binder resins capable of preventing sticking and imparting durability, but the rubber hose that dissolves the plasticizer in the fuel is also new and thereafter In this case, since the elution amount of the plasticizer changes, even if the blending ratio is changed, the use conditions are different, so it is difficult to correspond at a high level.
JP 2007-205216 A

本発明は上記実情に鑑みてなされたものであり、燃料ホース等から燃料に溶出する可塑剤によって生じるインジェクタ弁体の作用面に施されたフッ素樹脂によるコーティング層と金属製のインジェクタシートとの貼り付き現象を回避し、密着性と剥離性をよくして応答性のよい気体燃料用インジェクタを提供することを課題とする。   The present invention has been made in view of the above circumstances, and a bonding layer of a fluororesin coating layer and a metal injector sheet applied to the working surface of an injector valve body produced by a plasticizer eluted from a fuel hose or the like into fuel. It is an object of the present invention to provide an injector for gaseous fuel that avoids sticking phenomenon, improves adhesion and peelability, and has good response.

前記課題を解決するためになされた本発明である気体燃料用インジェクタは、弾性材により形成された基材の表面にフッ素樹脂のコーティング層を有する密接部材が作用面に配置されているインジェクタ弁体と、このインジェクタ弁体と接離するインジェクタシートを有する弁座とを有する気体燃料用インジェクタにおいて、前記インジェクタシートの表面にフッ素樹脂粒子を含有したＮｉ−Ｐめっきからなるコーティング層を施すこととした。   An injector for gaseous fuel according to the present invention made to solve the above-mentioned problem is an injector valve body in which a close contact member having a fluororesin coating layer is disposed on a working surface on the surface of a base material formed of an elastic material. And a gas fuel injector having a valve seat having an injector seat that contacts and separates from the injector valve body, a coating layer made of Ni-P plating containing fluororesin particles is applied to the surface of the injector seat. .

インジェクタシートの表面に低摩擦性のフッ素樹脂粒子を含有したＮｉ−Ｐめっきからなるコーティング層を施すことによりインジェクタ弁体の剥離性の向上を図ることができる。   It is possible to improve the peelability of the injector valve body by applying a coating layer made of Ni-P plating containing low-friction fluororesin particles on the surface of the injector sheet.

また、本発明において、前記インジェクタシートの表面に施されているコーティング層におけるフッ素樹脂粒子が３０〜３５容量％である場合には密着性と剥離性の調和を図ることができ、更に、本発明において前記インジェクタシートの表面に施されているコーティング層の厚さを１〜３０μｍ程度とすることにより、均一な被膜により密着性も良好で確実に閉弁をすることができる。   Further, in the present invention, when the fluororesin particles in the coating layer applied to the surface of the injector sheet is 30 to 35% by volume, it is possible to achieve harmony between adhesion and releasability. When the thickness of the coating layer applied to the surface of the injector sheet is set to about 1 to 30 μm, the uniform coating can ensure good closeness and close the valve.

以上、本発明によれば、フッ素樹脂によるコーティング層が施されたインジェクタ弁体と金属製のインジェクタシートシートとの間の燃料による可塑剤溶出による貼り付きと耐久性とを両立させることが可能であり、複雑な配合や特殊な技術を必要とせず、経済面でも優れている。   As described above, according to the present invention, it is possible to achieve both adhesion and durability due to the elution of the plasticizer by the fuel between the injector valve body coated with the fluororesin coating layer and the metal injector seat sheet. Yes, it does not require complicated blending or special technology, and is excellent in terms of economy.

次に、本発明の好ましい実施の形態を図面に基づいて詳細に説明する。   Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

図１（ａ）は本発明におけるインジェクタの概略図、図１（ｂ）はその要部を拡大したものであり、インジェクタ全体の構造は従来と同様に、電磁コイル６を保持して外ケース７に内装させたコイルホルダ８の中心に流量調整ねじ９が配置されており、その下端にばね体１０を介してインジェクタ弁体１が軸線方向に往復動可能に配置されたものであって、コネクタ１１に接続された導線（図示せず）を介してＥＣＵ（図示せず）からの指令に基づき前記電磁コイル６をオンオフ作動させてインジェクタ弁体１を昇降させて、その下方に対向して配置した燃料通孔１２を有する弁座ホルダ１３に保持された弁座３のインジェクタシート４に接離して燃料入口１４から送られてくる燃料を所定の間隔で間歇的に前記燃料通孔１２に送る従来のものと同様である。   FIG. 1A is a schematic view of an injector according to the present invention, and FIG. 1B is an enlarged view of the main part thereof. The structure of the entire injector is similar to the conventional structure, and holds an electromagnetic coil 6 and an outer case 7. The flow rate adjusting screw 9 is arranged at the center of the coil holder 8 housed in the cylinder, and the injector valve body 1 is arranged at the lower end of the coil holder 8 through the spring body 10 so as to be capable of reciprocating in the axial direction. The electromagnetic coil 6 is turned on and off based on a command from an ECU (not shown) through a conductive wire (not shown) connected to the valve 11, and the injector valve body 1 is moved up and down, and is arranged facing the lower side. The fuel sent from the fuel inlet 14 in contact with and away from the injector seat 4 of the valve seat 3 held by the valve seat holder 13 having the fuel passage hole 12 is intermittently sent to the fuel passage hole 12 at a predetermined interval. Conventional one Is the same as that.

そして、前記インジェクタ弁体１は前記図２に示した従来例と同様に、ステンレスなどの金属製で作用面にゴムや合成樹脂などの弾性材により形成された基材２が設けられており、更に、対向するインジェクタシート４への密着性や剥離性を向上させる目的でフッ素樹脂によるコーティング層５が形成されている。   The injector valve body 1 is made of a metal such as stainless steel and is provided with a base material 2 made of an elastic material such as rubber or synthetic resin, as in the conventional example shown in FIG. Further, a coating layer 5 made of a fluororesin is formed for the purpose of improving the adhesion and peelability to the opposing injector sheet 4.

特に、本実施の形態では、前記インジェクタ弁体１と接離するインジェクタシート４の表面にフッ素樹脂粒子を含有したＮｉ−Ｐめっきからなるコーティング層１５が施されている。   In particular, in the present embodiment, a coating layer 15 made of Ni-P plating containing fluororesin particles is applied to the surface of the injector sheet 4 that contacts and separates from the injector valve body 1.

このフッ素樹脂粒子を含有したＮｉ−Ｐめっきからなるコーティング層１５は、Ｎｉ（ニッケル）−Ｐ（リン）のマトリックスにフッ素樹脂粒子を分散させたものであり、従来知られているようにＮｉ−Ｐの組成を有する無電解めっきにより得られる。   The coating layer 15 made of Ni—P plating containing the fluororesin particles is obtained by dispersing fluororesin particles in a Ni (nickel) -P (phosphorus) matrix. It is obtained by electroless plating having a composition of P.

また、前記コーティング層１５は、フッ素樹脂粒子が３０〜３５容量％であると好ましく、耐久性と剥離性の調和がとれる。更に、前記コーティング層１５の厚さが１〜３０μｍ程度であることにより密着性と剥離性の調和をとることができる。   The coating layer 15 preferably contains 30 to 35% by volume of fluororesin particles, and the durability and releasability can be harmonized. Furthermore, when the thickness of the coating layer 15 is about 1 to 30 μm, it is possible to balance the adhesion and peelability.

以上のように本実施の形態によれば、インジェクタシート４の表面を剥離性に優れた表面処理をすることにより、粘着性の増加による開弁作動への影響をきわめて有効に防止して密着性と剥離性をよくして優れた応答性を発揮させることができる。   As described above, according to the present embodiment, the surface of the injector sheet 4 is subjected to a surface treatment with excellent peelability, so that the influence on the valve opening operation due to the increase in the adhesiveness can be extremely effectively prevented. It is possible to improve releasability and to exhibit excellent responsiveness.

本発明の好ましい実施の形態を示す概略図および拡大部分概略図。BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows preferable embodiment of this invention, and an expanded partial schematic. 従来例を示す拡大部分概略図。The enlarged partial schematic diagram which shows a prior art example.

符号の説明Explanation of symbols

１ インジェクタ弁体、２ 基材、４ インジェクタシート、５ コーティング層、１５ コーティング層
1 Injector valve body, 2 base material, 4 injector seat, 5 coating layer, 15 coating layer

Claims (3)

弾性材により形成された基材の表面にフッ素樹脂のコーティング層を有する密接部材が作用面に配置されているインジェクタ弁体と、このインジェクタ弁体と接離するインジェクタシートを有する弁座とを有する気体燃料用インジェクタにおいて、前記インジェクタシートの表面にフッ素樹脂粒子を含有したＮｉ−Ｐめっきからなるコーティング層が施されていることを特徴とする気体燃料用インジェクタ。   An injector valve body in which a close contact member having a fluororesin coating layer is disposed on the working surface on the surface of a base material formed of an elastic material, and a valve seat having an injector seat that contacts and separates from the injector valve body An injector for gaseous fuel, wherein a coating layer made of Ni-P plating containing fluororesin particles is applied to the surface of the injector sheet. 前記インジェクタシートの表面に施されているコーティング層におけるフッ素樹脂粒子が３０〜３５容量％であることを特徴とする請求項１記載の気体燃料用インジェクタ。   The injector for gaseous fuel according to claim 1, wherein the fluororesin particles in the coating layer applied to the surface of the injector sheet is 30 to 35% by volume. 前記インジェクタシートの表面に施されているコーティング層の厚さが１〜３０μｍ程度であることを特徴とする請求項１または２に記載の気体燃料用インジェクタ。
The gaseous fuel injector according to claim 1 or 2, wherein a thickness of a coating layer applied to a surface of the injector sheet is about 1 to 30 µm.
JP2008125388A 2008-05-13 2008-05-13 Injector for gaseous fuel Pending JP2009275535A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102678390A (en) * 2011-03-15 2012-09-19 株式会社日气 Injector for gas fuel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08283955A (en) * 1995-04-12 1996-10-29 Seiko Seiki Co Ltd Corrosion protective structure
JP2007205216A (en) * 2006-02-01 2007-08-16 Nikki Co Ltd Injector valve of injector for gaseous fuel
JP2008106656A (en) * 2006-10-25 2008-05-08 Nikki Co Ltd Fuel injection valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08283955A (en) * 1995-04-12 1996-10-29 Seiko Seiki Co Ltd Corrosion protective structure
JP2007205216A (en) * 2006-02-01 2007-08-16 Nikki Co Ltd Injector valve of injector for gaseous fuel
JP2008106656A (en) * 2006-10-25 2008-05-08 Nikki Co Ltd Fuel injection valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102678390A (en) * 2011-03-15 2012-09-19 株式会社日气 Injector for gas fuel

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