JP4407863B2 - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP4407863B2
JP4407863B2 JP2000267660A JP2000267660A JP4407863B2 JP 4407863 B2 JP4407863 B2 JP 4407863B2 JP 2000267660 A JP2000267660 A JP 2000267660A JP 2000267660 A JP2000267660 A JP 2000267660A JP 4407863 B2 JP4407863 B2 JP 4407863B2
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Japan
Prior art keywords
wall surface
annular groove
spring
sealing
seal member
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JP2002081542A (en
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孝裕 新開
一郎 大村
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Description

【０００１】
【発明の属する技術分野】
本発明は、第１部材が第２部材の挿入孔に挿入された状態で、第１部材の壁面と該挿入孔の壁面との間を密封するシール装置に関し、例えば内燃機関の燃料噴射弁の壁面と、シリンダヘッドに設けられて該燃料噴射弁が挿入された挿入孔の壁面との間を密封するシール装置に関する。
【０００２】
【従来の技術】
従来、希薄燃焼による排気エミッションの改善および燃費の改善に効果的な火花点火式の内燃機関として、シリンダヘッドに設けられた燃料噴射弁から燃焼室内に燃料を直接噴射する筒内噴射式内燃機関が知られている。この筒内噴射式内燃機関では、シリンダヘッドに設けられた収容孔に燃料噴射弁が収容され、燃料噴射弁の先端部は、収容孔から延びて燃焼室に開口する挿入孔に挿入されて、燃焼室内に臨んでいる。そのため、燃料噴射弁と挿入孔との間から燃焼室内の高圧の燃焼ガスが漏れないようにする必要があり、そのための種々なシール装置が提案されている。
【０００３】
例えば特開平１１−２１０８８６号公報に開示されたガスケットは、インジェクタとハウジングとの間で、両者の段部を利用して形成された空間に装着されものであって、該ガスケットは、断面略Ｕ字形のソフトメタル製のシール部材と、該シール部材の内側に配置されて該シール部材をインジェクタおよびハウジングに対して所定の面圧で接触させるためのハードメタル製のバネ部材とを備えており、Ｕ字形のシール部材の開口部は燃焼ガス側を向いている。そして、このガスケットに、シール圧力としての燃焼ガス圧が作用すると、シール部材のＵ字を形成する双方の端部が弾性変形して、インジェクタおよびハウジングにそれぞれに対して強く広く密接することにより、十分なシール性が発揮される。
【０００４】
【発明が解決しようとする課題】
ところで、前記ガスケットでは、シール部材は金属製であることから、やはり金属製であるインジェクタおよびハウジングに対するシール部材の接触性は必ずしも良好ではなく、その接触性を高めるために、シール部材の表面にゴム等のコーティングを施したりしている。このように、前記シール部材では、良好な接触性を確保するために、その形状や弾性力を設定する加工、さらにはコーティング等の処理が必要となって、シール部材の生産工数が増大して生産性が劣り、しかもコスト高となる難点があった。
【０００５】
また、インジェクタおよびハウジングに対するシール部材の弾性力による面圧を高めることで接触性を高めることも考えられるが、シール部材が溝に装着された部材の場合、該部材を、別の部材に設けられた挿入孔に挿入するには、その高い面圧により生じる摩擦力に打ち勝つ力を加えて挿入する必要が生じて、シール部材が装着された部材の組付け性が低下することになる。
【０００６】
本発明は、このような事情に鑑みてなされたものであって、第１部材の壁面および挿入孔の壁面に対する接触性が良好なシール部材を有し、熱収縮によりシール部材自体の弾性力が低下する低温の温度環境下にあって、またはシール部材のクリープにより該シール部材自体の弾性力が低下する高温の温度環境下にあって、環状溝の側壁面と底壁面、および挿入孔の周壁面に対するシール部材自体の弾性力による面圧が低下したとしても、バネのバネ力により、シール装置の面圧の低下が抑えられ、シール性が極端に低下することを防止できるシール装置を提供することを目的とする。
【０００７】
【課題を解決するための手段および発明の効果】
請求項１記載の発明は、第１部材の壁面と、第２部材に設けられて前記第１部材が挿入された挿入孔の壁面との間の密封機能が、前記第１部材に設けられた環状溝に装着された環状のシール部材によりなされるシール装置において、前記シール部材は樹脂またはゴムからなる弾性材で形成され、前記環状溝内または前記シール部材には、前記第１部材の前記壁面および前記挿入孔の前記壁面に対する前記シール部材の面圧を増大させる面圧増大手段が設けられ、前記面圧増大手段は、前記挿入孔への前記第１部材の挿入方向とは反対方向に屈曲していて前記シール部材を前記挿入孔の前記壁面に押圧する押圧部を有する円環状のバネであり、前記押圧部は、前記シール部材を、前記挿入孔の前記壁面と、前記環状溝の、前記挿入方向側の側壁面とに向けて押圧することを特徴とする。
【０００８】
この請求項１記載の発明によれば、シール部材は、樹脂またはゴムからなる弾性材で形成されているので、第１部材の壁面および挿入孔の壁面に対する接触性が良好であり、しかもシール部材自体は、成形機により簡単に製造できる。また、シール装置が、シール部材の熱収縮により該シール部材自体の弾性力が低下する低温の温度環境下にあって、またはシール部材のクリープにより該シール部材自体の弾性力が低下する高温の温度環境下にあって、第１部材の壁面および挿入孔の壁面に対するシール部材自体の弾性力による面圧が低下したとしても、バネの働きでシール装置の面圧の低下が抑えられ、シール性が極端に低下することが防止される。
【０００９】
その結果、シール部材の接触性が良好であると共に、そのシール部材自体は簡単に製造できるため、生産性が良好でかつ低コストなシール部材を得ることができる。また、シール部材自体の弾性力が低下し得る低温または高温の温度環境下にあっても、バネによりシール装置の面圧の低下が抑えられ、第１部材の壁面および挿入孔の壁面との間で良好なシール性を確保できる。
【００１０】
請求項２記載の発明は、請求項１記載のシール装置において、前記バネは、前記環状溝の、前記挿入方向とは反対方向側の側壁面および底壁面に当接するように折曲された取付部を有し、前記バネは、前記取付部により前記環状溝に取り付けられることを特徴とする。
【００１１】
請求項２記載の発明によれば、バネが、環状溝の、挿入方向とは反対方向側の側壁面および底壁面に当接するように折曲された取付部により環状溝に取り付けられることで、環状溝内へのバネの取り付けが確実になる。
【００１２】
請求項３記載の発明は、請求項１記載のシール装置において、前記押圧部が、前記シール部材に埋め込まれていることを特徴とする。
【００１３】
請求項３記載の発明によれば、バネの押圧部が、シール部材に埋め込まれることで、バネとシール部材が一体化し、取り扱いが容易になる。
【００１４】
請求項４記載の発明は、請求項１記載のシール装置において、前記バネは、前記環状溝の底壁面に設けられた溝に嵌入されて固定される取付部を有し、前記バネは、前記取付部により前記環状溝に取り付けられることを特徴とする。
【００１５】
請求項４記載の発明によれば、バネの取付部が、環状溝の底壁面に設けた溝に嵌入されて固定されることで、環状溝内へのバネの取り付けが容易かつ確実になる。
【００１６】
【発明の実施の形態】
以下、本発明の実施例を図１ないし図３を参照して説明する。
図１は、本発明のシール装置が、火花点火式の内燃機関であって、燃焼室内に燃料が直接噴射される筒内噴射式内燃機関において、燃料噴射弁の先端部の外周壁面と、該先端部が挿入されたシリンダヘッドに設けられた挿入孔の周壁面との間のシール装置１として適用された第１実施例を示すものである。この第１実施例において、燃料噴射弁は、シリンダのシリンダ孔内に摺動自在に嵌合されて往復動するピストンとの間に燃焼室Ｃを形成するシリンダヘッド２に設けられた収容孔内に収容され、燃料噴射弁の円柱状の先端部３が、収容孔から延びて燃焼室Ｃに開口するようにシリンダヘッド２に設けられた円孔からなる挿入孔４に挿入されている。この挿入孔４の内径は、燃料噴射弁の先端部３と挿入孔４との間に、先端部３の挿入を許容する微小な隙間Ｇが形成されるように適宜決定される。
【００１７】
先端部３の外周壁面10には、燃焼室Ｃに臨んで燃料が噴射される噴口を有する先端部３の端面11から先端部３の中心軸線方向（以下、「軸方向」という）に離隔した位置に、円環状の環状溝12が設けられる。環状溝12は、前記中心軸線と直交する平面からなる円環状の第１側壁面13と、該第１側壁面13に対して、燃焼室Ｃ側とは反対側で軸方向に離隔した位置にあって、第１側壁面13と平行な平面からなる円環状の第２側壁面14と、軸方向で第１，第２側壁面13，14の間に位置し前記中心軸線を中心線とする円柱面からなる底壁面15とを有する。ここで、環状溝12のこれら第１，第２側壁面13，14および底壁面15は、先端部３の外周壁面10の一部である。
【００１８】
一方、環状溝12に装着される円環状のシール部材20は、四フッ化エチレン樹脂（ＰＴＦＥ）等のフッ素樹脂またはフッ素ゴム、シリコンゴム等の合成ゴムからなる弾性材で形成される。このシール部材20の、環状溝12に装着される前の断面形状は、略長方形であり、その軸方向の幅は、環状溝12の軸方向の幅と略等しい値を有する。
【００１９】
さらに、環状溝12には、環状溝12内でシール部材20の径方向内方に位置して円環状の面圧調整部材としてバネ32が設けられている。シール装置１は、シール部材20と、環状溝12に装着される円環状のバネ32とで構成される。
【００２０】
シール部材20は、環状溝12の底壁面15の径と略同じ内径と挿入孔４の径よりも大きな外径とを有する。そして、バネ32は、例えばバネ鋼からなる板材から形成される。バネ32は、環状溝12に装着されたときに第２側壁面14および周壁面５に当接するように折曲された取付部32aと、シール部材20を環状溝12の第１側壁面13および挿入孔４の周壁面５に向けて押圧する押圧部32bとを有し、該取付部32aにより環状溝12に取り付けられる。なお、環状溝12へのバネ32の装着を容易にするために、バネ32の一部に切り口を設けることもできる。
【００２１】
押圧部32bは、そのバネ力を第１側壁面13および周壁面５に向かって作用させる。それゆえ、燃料噴射弁の先端部３を挿入孔４に挿入するときは、先ず、環状溝12にバネ32が装着され、次いでシール部材20が、バネ32の押圧部32bの燃焼室Ｃ寄りで底壁面15に接触する位置で、押圧部32bと第１側壁面13との間で環状溝12に装着される。そして、燃料噴射弁の先端部３が挿入孔４に挿入されて、燃料噴射弁がシリンダヘッド２の所定位置に固定された状態では、シール部材20は、底壁面15と周壁面５との間で圧縮されて変形し、シール部材20自体の弾性力により底壁面15および周壁面５に面圧を作用させると共に、バネ32により第１側壁面13および周壁面５に対して押圧される。したがって、シール部材20は、シール部材20自体の弾性力およびバネ32のバネ力によって、設定された面圧を第１側壁面13、底壁面15および周壁面５に対して作用させて、先端部３の外周壁面10と挿入孔４の周壁面５との間の所期の密封機能が得られるようにされる。
【００２２】
次に、前述のように構成された第１実施例の作用および効果について説明する。
シール部材20は、合成樹脂または合成ゴムからなる弾性材で形成されているので、第１部材の壁面および挿入孔４の壁面に対する接触性が良好であり、しかもシール部材20自体は、成形機により簡単に製造できる。また、シール装置１が、熱収縮により該シール部材20自体の弾性力が低下する低温の温度環境下にあって、またはシール部材20のクリープにより該シール部材20自体の弾性力が低下する高温の温度環境下にあって、環状溝12の第１側壁面13と底壁面15、および挿入孔４の周壁面５に対するシール部材20自体の弾性力による面圧が低下したとしても、バネ32のバネ力により、シール装置１の面圧の低下が抑えられ、シール性が極端に低下することが防止される。
【００２３】
その結果、シール部材20の接触性が向上してシール性が向上すると共に、シール部材20自体は簡単に製造できるため、生産性が良好でかつ低コストなシール部材20を得ることができる。また、シール部材20自体の弾性力が低下し得る低温または高温の温度環境下にあっても、バネ32によりシール装置１の面圧の低下が抑えられ、環状溝12の第１側壁面13および底壁面15と挿入孔４の周壁面５との間で良好なシール性を確保できる。
【００２４】
次に、第２実施例を説明すると、図２に示されるように、円環状のバネ33は、その取付部33aが環状溝12の底壁面15に設けられた溝に嵌入されて固定されることにより、環状溝12に取り付けられており、また押圧部33bは第１実施例と同様である。なお、バネ33に切り口を設けて、環状溝12への装着が容易になるようにできる。また、円環状のバネ32の代わりに、周方向に間隔をおいて溝に嵌入された複数個のバネを用いることもできる。そして、この第２実施例においても、第１実施例と同じ作用および効果が奏される。
【００２５】
また、第３実施例は、図３に示されるように、押圧部34bが、シール部材20の成形時にシール部材20に埋め込まれて、両者が一体化されたもので、取付部34aは、第１実施例と同様にして環状溝12に係止される。そして、先端部３にシール装置１を装着するに当たっては、一体となったシール部材20およびバネ34を、環状溝12に装着すればよい。これによって、第１実施例と同じ作用および効果が奏されるうえ、シール装置１の組付け性が向上する。
【００２６】
以下、前述した実施例の一部の構成を変更した実施例について、変更した構成に関して説明する。
前記各実施例では、燃料噴射弁はシリンダヘッド２に設けられたが、燃料噴射弁が吸気通路に臨んで取り付けられる内燃機関においても、燃料噴射弁と吸気マニホルドまたは吸気管との間で、本発明のシール装置１が使用され得る。さらに、内燃機関は、火花点火式のものでなく、圧縮着火式のものであってもよい。
【００２７】
さらに、本発明のシール装置１は、燃料噴射弁およびシリンダヘッド２以外に、部材に設けられた挿入孔内で固定される軸、また部材に設けられた挿入孔内で回転する回転軸や、挿入孔内で往復動する往復軸のシール装置としても使用できる。
【図面の簡単な説明】
【図１】 本発明の第１実施例を示し、シール装置が装着された燃料噴射弁の先端部がシリンダヘッドの挿入孔に挿入されたときの要部断面図である
【図２】 本発明の第２実施例の図１と同様の図である。
【図３】 本発明の第３実施例の図１と同様の図である。
【符号の説明】
１…シール装置、２…シリンダヘッド、３…先端部、４…挿入孔、５…周壁面、
10…外周壁面、11…端面、12…環状溝、13，14…側壁面、15…底壁面、
20…シール部材、
32，33，34…バネ、32a，33a，34a…バネの取付部、32b，33b，34b…バネの押圧部、
Ｃ…燃焼室、Ｇ，隙間。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal device that seals between a wall surface of a first member and a wall surface of the insertion hole in a state in which the first member is inserted into an insertion hole of a second member, for example, a fuel injection valve of an internal combustion engine The present invention relates to a seal device that seals between a wall surface and a wall surface of an insertion hole provided in a cylinder head and into which the fuel injection valve is inserted.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a spark ignition type internal combustion engine that is effective for improving exhaust emission by lean combustion and improving fuel efficiency, an in-cylinder injection type internal combustion engine that directly injects fuel into a combustion chamber from a fuel injection valve provided in a cylinder head is known. Are known. In this cylinder injection internal combustion engine, the fuel injection valve is accommodated in the accommodation hole provided in the cylinder head, and the tip of the fuel injection valve is inserted into the insertion hole extending from the accommodation hole and opening to the combustion chamber, It faces the combustion chamber. Therefore, it is necessary to prevent high-pressure combustion gas in the combustion chamber from leaking between the fuel injection valve and the insertion hole, and various sealing devices have been proposed.
[0003]
For example, a gasket disclosed in Japanese Patent Application Laid-Open No. 11-210886 is mounted in a space formed between the injector and the housing by using the step portion of both, and the gasket has a substantially U-shaped cross section. A seal member made of soft metal, and a hard metal spring member disposed inside the seal member for bringing the seal member into contact with the injector and the housing at a predetermined surface pressure; The opening of the U-shaped seal member faces the combustion gas side. And when the combustion gas pressure as the sealing pressure acts on this gasket, both end portions forming the U-shape of the sealing member are elastically deformed, and strongly and closely contact each of the injector and the housing, Sufficient sealing performance is demonstrated.
[0004]
[Problems to be solved by the invention]
By the way, in the gasket, since the seal member is made of metal, the contact property of the seal member to the injector and the housing, which are also made of metal, is not always good. In order to improve the contact property, the surface of the seal member is made of rubber. The coating such as. As described above, in order to ensure good contact with the seal member, processing for setting its shape and elastic force, and further processing such as coating are required, which increases the number of man-hours for producing the seal member. The productivity is inferior and the cost is high.
[0005]
In addition, it is conceivable to improve the contact by increasing the surface pressure due to the elastic force of the seal member with respect to the injector and the housing. However, in the case where the seal member is a member mounted in the groove, the member is provided on another member. In order to insert into the insertion hole, it is necessary to insert by inserting a force that overcomes the frictional force generated by the high surface pressure, and the assembling property of the member to which the seal member is attached is lowered.
[0006]
The present invention has been made in view of such circumstances, and has a seal member having good contact with the wall surface of the first member and the wall surface of the insertion hole, and the elastic force of the seal member itself is caused by heat shrinkage. In a low temperature environment where the temperature is lowered or in a high temperature environment where the elastic force of the seal member itself is reduced due to creep of the seal member, the side wall surface and the bottom wall surface of the annular groove, and the periphery of the insertion hole Provided is a sealing device in which even if the surface pressure due to the elastic force of the sealing member itself against the wall surface is reduced, the reduction of the surface pressure of the sealing device is suppressed by the spring force of the spring, and the sealing performance can be prevented from being extremely reduced. For the purpose.
[0007]
[Means for Solving the Problems and Effects of the Invention]
According to the first aspect of the present invention, a sealing function between the wall surface of the first member and the wall surface of the insertion hole provided in the second member and having the first member inserted therein is provided in the first member. In the sealing device formed by the annular seal member mounted in the annular groove, the seal member is formed of an elastic material made of resin or rubber, and the wall surface of the first member is disposed in the annular groove or in the seal member. And a surface pressure increasing means for increasing a surface pressure of the seal member with respect to the wall surface of the insertion hole, the surface pressure increasing means being bent in a direction opposite to a direction in which the first member is inserted into the insertion hole. And an annular spring having a pressing portion that presses the sealing member against the wall surface of the insertion hole, and the pressing portion includes the sealing member, the wall surface of the insertion hole, and the annular groove, Side wall on the insertion direction side Characterized in that it pressed against the door.
[0008]
According to the first aspect of the present invention, since the seal member is formed of an elastic material made of resin or rubber, the contact with the wall surface of the first member and the wall surface of the insertion hole is good, and the seal member As such, it can be easily manufactured by a molding machine. Also, the sealing device is in a low temperature environment where the elastic force of the sealing member itself is reduced due to thermal contraction of the sealing member, or a high temperature at which the elastic force of the sealing member itself is reduced due to creep of the sealing member. Even if the surface pressure due to the elastic force of the sealing member itself against the wall surface of the first member and the wall surface of the insertion hole is reduced under the environment, the reduction of the surface pressure of the sealing device is suppressed by the action of the spring , and the sealing performance It is prevented that it falls extremely.
[0009]
As a result, the contactability of the seal member is good, and since the seal member itself can be easily manufactured, a seal member with good productivity and low cost can be obtained. Further, even in a low temperature environment or a high temperature environment where the elastic force of the sealing member itself can be reduced, the reduction in the surface pressure of the sealing device is suppressed by the spring , and the space between the wall surface of the first member and the wall surface of the insertion hole Good sealing performance can be secured.
[0010]
According to a second aspect of the present invention, there is provided the sealing device according to the first aspect, wherein the spring is bent so as to contact the side wall surface and the bottom wall surface of the annular groove opposite to the insertion direction. And the spring is attached to the annular groove by the attachment portion.
[0011]
According to the invention of claim 2, the spring is attached to the annular groove by the attachment portion bent so as to contact the side wall surface and the bottom wall surface of the annular groove in the direction opposite to the insertion direction. The installation of the spring in the annular groove is ensured.
[0012]
According to a third aspect of the present invention, in the sealing device according to the first aspect, the pressing portion is embedded in the sealing member.
[0013]
According to the third aspect of the invention, the spring pressing portion is embedded in the sealing member, so that the spring and the sealing member are integrated, and the handling becomes easy.
[0014]
According to a fourth aspect of the present invention, in the sealing device according to the first aspect, the spring has a mounting portion that is fitted into and fixed to a groove provided on a bottom wall surface of the annular groove, and the spring It is attached to the annular groove by an attaching portion.
[0015]
According to the fourth aspect of the present invention, the spring mounting portion is easily and surely attached to the annular groove by being fitted and fixed in the groove provided on the bottom wall surface of the annular groove.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention with reference to FIGS.
FIG. 1 shows a spark ignition type internal combustion engine in which the sealing device of the present invention is a direct injection type internal combustion engine in which fuel is directly injected into a combustion chamber. The 1st Example applied as the sealing apparatus 1 between the surrounding wall surfaces of the insertion hole provided in the cylinder head in which the front-end | tip part was inserted is shown. In this first embodiment, the fuel injection valve is fitted in a cylinder hole of a cylinder head 2 that forms a combustion chamber C between a reciprocating piston that is slidably fitted in a cylinder hole of a cylinder. The cylindrical tip portion 3 of the fuel injection valve is inserted into an insertion hole 4 formed of a circular hole provided in the cylinder head 2 so as to extend from the accommodation hole and open to the combustion chamber C. The inner diameter of the insertion hole 4 is appropriately determined so that a minute gap G that allows the insertion of the distal end portion 3 is formed between the distal end portion 3 of the fuel injection valve and the insertion hole 4.
[0017]
The outer peripheral wall surface 10 of the tip 3 is spaced from the end surface 11 of the tip 3 having a nozzle through which the fuel is injected facing the combustion chamber C in the central axis direction of the tip 3 (hereinafter referred to as “axial direction”). An annular groove 12 is provided at the position. The annular groove 12 has an annular first side wall surface 13 composed of a plane orthogonal to the central axis, and is spaced from the first side wall surface 13 in the axial direction on the side opposite to the combustion chamber C side. And located between the annular second side wall surface 14 formed of a plane parallel to the first side wall surface 13 and the first and second side wall surfaces 13 and 14 in the axial direction, with the central axis as the center line. And a bottom wall surface 15 made of a cylindrical surface. Here, the first and second side wall surfaces 13 and 14 and the bottom wall surface 15 of the annular groove 12 are a part of the outer peripheral wall surface 10 of the distal end portion 3.
[0018]
On the other hand, the annular seal member 20 mounted in the annular groove 12 is formed of an elastic material made of a fluororesin such as tetrafluoroethylene resin (PTFE) or a synthetic rubber such as fluororubber or silicon rubber. The cross-sectional shape of the seal member 20 before being attached to the annular groove 12 is a substantially rectangular shape, and the axial width thereof is substantially equal to the axial width of the annular groove 12.
[0019]
Further, the annular groove 12 is provided with a spring 32 as an annular surface pressure adjusting member positioned inwardly in the radial direction of the seal member 20 in the annular groove 12 . The sealing device 1 includes a sealing member 20 and an annular spring 32 mounted in the annular groove 12.
[ 0020 ]
The seal member 20 has an inner diameter substantially the same as the diameter of the bottom wall surface 15 of the annular groove 12 and an outer diameter larger than the diameter of the insertion hole 4. The spring 32 is formed of a plate material made of, for example, spring steel. The spring 32 includes a mounting portion 32a bent so as to contact the second side wall surface 14 and the peripheral wall surface 5 when mounted in the annular groove 12, and the seal member 20 with the first side wall surface 13 of the annular groove 12 and A pressing portion 32b that presses toward the peripheral wall surface 5 of the insertion hole 4 and is attached to the annular groove 12 by the mounting portion 32a. In order to make it easy to attach the spring 32 to the annular groove 12, a cut may be provided in a part of the spring 32.
[ 0021 ]
The pressing portion 32 b causes the spring force to act toward the first side wall surface 13 and the peripheral wall surface 5. Therefore, when inserting the tip portion 3 of the fuel injection valve into the insertion hole 4, first, the spring 32 is mounted in the annular groove 12, and then the seal member 20 is close to the combustion chamber C of the pressing portion 32 b of the spring 32. The annular groove 12 is mounted between the pressing portion 32 b and the first side wall surface 13 at a position in contact with the bottom wall surface 15. In the state where the tip 3 of the fuel injection valve is inserted into the insertion hole 4 and the fuel injection valve is fixed at a predetermined position of the cylinder head 2, the seal member 20 is located between the bottom wall surface 15 and the peripheral wall surface 5. The pressure is applied to the bottom wall surface 15 and the peripheral wall surface 5 by the elastic force of the seal member 20 itself, and the spring 32 is pressed against the first side wall surface 13 and the peripheral wall surface 5. Therefore, the seal member 20 causes the set surface pressure to act on the first side wall surface 13, the bottom wall surface 15 and the peripheral wall surface 5 by the elastic force of the seal member 20 itself and the spring force of the spring 32, thereby The desired sealing function between the outer peripheral wall surface 3 and the peripheral wall surface 5 of the insertion hole 4 is obtained.
[ 0022 ]
Next, the operation and effect of the first embodiment configured as described above will be described.
Since the seal member 20 is formed of an elastic material made of synthetic resin or synthetic rubber, the contact property with respect to the wall surface of the first member and the wall surface of the insertion hole 4 is good, and the seal member 20 itself is obtained by a molding machine. Easy to manufacture. Further, the sealing device 1 is in a low temperature environment where the elastic force of the seal member 20 itself decreases due to thermal contraction, or the elastic force of the seal member 20 itself decreases due to creep of the seal member 20. Even if the surface pressure due to the elastic force of the seal member 20 itself against the first side wall surface 13 and the bottom wall surface 15 of the annular groove 12 and the peripheral wall surface 5 of the insertion hole 4 is reduced under the temperature environment, the spring of the spring 32 The force suppresses a decrease in the surface pressure of the sealing device 1 and prevents the sealing performance from being extremely lowered.
[ 0023 ]
As a result, the contactability of the seal member 20 is improved, the sealability is improved, and the seal member 20 itself can be easily manufactured, so that the seal member 20 with good productivity and low cost can be obtained. Even in a low temperature environment or a high temperature environment where the elastic force of the sealing member 20 itself can be reduced, the reduction in the surface pressure of the sealing device 1 is suppressed by the spring 32, and the first side wall surface 13 of the annular groove 12 and Good sealing performance can be secured between the bottom wall surface 15 and the peripheral wall surface 5 of the insertion hole 4.
[ 0024 ]
Next, a description will be given of a second embodiment, as shown in Figure 2, the annular spring 33, the mounting portion 33a is fixed is fitted into a groove provided in the bottom wall 15 of the annular groove 12 Thus, it is attached to the annular groove 12, and the pressing portion 33b is the same as in the first embodiment. It should be noted that the spring 33 can be provided with a cut so that it can be easily attached to the annular groove 12. Further, instead of the annular spring 32, a plurality of springs fitted in the groove at intervals in the circumferential direction may be used. In the second embodiment, the same operations and effects as the first embodiment are achieved.
[ 0025 ]
The third embodiment, as shown in Figure 3, the pressing portion 34b is embedded in the sealing member 20 during molding of the seal member 20, in which both are integrated, the attachment unit 34a, In the same manner as in the first embodiment, it is locked in the annular groove 12. When the sealing device 1 is attached to the distal end portion 3, the integrated sealing member 20 and spring 34 may be attached to the annular groove 12. As a result, the same operations and effects as the first embodiment are achieved, and the assembling property of the sealing device 1 is improved.
[ 0026 ]
Hereinafter, an example in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
In each of the above-described embodiments, the fuel injection valve is provided in the cylinder head 2. However, even in an internal combustion engine in which the fuel injection valve is mounted facing the intake passage, the fuel injection valve is connected between the fuel injection valve and the intake manifold or the intake pipe. The inventive sealing device 1 can be used. Further, the internal combustion engine may be a compression ignition type instead of a spark ignition type.
[ 0027 ]
In addition to the fuel injection valve and the cylinder head 2, the sealing device 1 of the present invention includes a shaft that is fixed in an insertion hole provided in the member, a rotating shaft that rotates in the insertion hole provided in the member, It can also be used as a reciprocating shaft sealing device that reciprocates within the insertion hole.
[Brief description of the drawings]
[1] shows a first embodiment of the present invention, is a fragmentary cross-sectional view of the distal end portion of the fuel injection valve seal apparatus is mounted is inserted into the insertion hole of the cylinder head [2] The present invention It is a figure similar to FIG. 1 of 2nd Example of this.
FIG. 3 is a view similar to FIG. 1 of the third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sealing device, 2 ... Cylinder head, 3 ... Tip part, 4 ... Insertion hole, 5 ... Circumferential wall surface,
10 ... outer peripheral wall surface, 11 ... end face, 12 ... annular groove, 13, 14 ... side wall surface, 15 ... bottom wall surface,
20 ... seal member,
32, 33, 34 ... spring, 32a, 33a, 34a ... spring mounting portion, 32b, 33b, 34b ... spring pressing portion,
C: Combustion chamber, G, gap.

Claims (4)

第１部材の壁面と、第２部材に設けられて前記第１部材が挿入された挿入孔の壁面との間の密封機能が、前記第１部材に設けられた環状溝に装着された環状のシール部材によりなされるシール装置において、
前記シール部材は樹脂またはゴムからなる弾性材で形成され、
前記環状溝内または前記シール部材には、前記第１部材の前記壁面および前記挿入孔の前記壁面に対する前記シール部材の面圧を増大させる面圧増大手段が設けられ、
前記面圧増大手段は、前記挿入孔への前記第１部材の挿入方向とは反対方向に屈曲していて前記シール部材を前記挿入孔の前記壁面に押圧する押圧部を有する円環状のバネであり、
前記押圧部は、前記シール部材を、前記挿入孔の前記壁面と、前記環状溝の、前記挿入方向側の側壁面とに向けて押圧することを特徴とするシール装置。And the wall of the first member, the annular wherein provided in the second member is the first member sealing function between the wall surface of the inserted insertion hole, which is mounted in an annular groove provided in the first member In the sealing device made by the sealing member of
The sealing member is formed of an elastic material made of resin or rubber,
In the annular groove or in the seal member, a surface pressure increasing means for increasing the surface pressure of the seal member against the wall surface of the first member and the wall surface of the insertion hole is provided,
The surface pressure increasing means, before Symbol said annular spring having a pressing portion to the insertion direction of the first member for pressing the seal member are bent in the opposite direction to the wall surface of the insertion hole into the insertion holes And
Before SL pressing portion, the sealing member, and the wall surface of the insertion hole, said annular groove, the sealing device, characterized in that for pressing on the side wall surface of the insertion direction side. 前記バネは、前記環状溝の、前記挿入方向とは反対方向側の側壁面および底壁面に当接するように折曲された取付部を有し、
前記バネは、前記取付部により前記環状溝に取り付けられることを特徴とする請求項１記載のシール装置。 Before Symbol spring, said annular groove having a mounting portion which is bent so as to abut against the side wall surfaces and bottom wall surface in the opposite direction side to the inserting direction,
The sealing device according to claim 1, wherein the spring is attached to the annular groove by the attachment portion. 前記押圧部が、前記シール部材に埋め込まれていることを特徴とする請求項１記載のシール装置。 Before SL pressing portion, the sealing apparatus according to claim 1, characterized in that embedded in the sealing member. 前記バネは、前記環状溝の底壁面に設けられた溝に嵌入されて固定される取付部を有し、
前記バネは、前記取付部により前記環状溝に取り付けられることを特徴とする請求項１記載のシール装置。 Before Symbol spring has an attachment portion fixed is fitted into a groove provided in the bottom wall of the annular groove,
The sealing device according to claim 1, wherein the spring is attached to the annular groove by the attachment portion.
JP2000267660A 2000-09-04 2000-09-04 Sealing device Expired - Fee Related JP4407863B2 (en)

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JP2004239124A (en) * 2003-02-05 2004-08-26 Hitachi Ltd Fuel injection valve and cylinder injection engine
JP4670873B2 (en) * 2008-01-11 2011-04-13 株式会社デンソー Injector
JP5243922B2 (en) * 2008-10-24 2013-07-24 株式会社豊田自動織機 Fuel injection device for internal combustion engine
JP5127682B2 (en) * 2008-11-27 2013-01-23 住友重機械工業株式会社 Lower bearing structure of the reducer output shaft
JP2010138778A (en) * 2008-12-11 2010-06-24 Mitsubishi Heavy Ind Ltd Cooling structure of fuel injection valve
US9284932B2 (en) * 2010-03-25 2016-03-15 Denso International America, Inc. Mounting structure for fuel injector
JP5270714B2 (en) * 2011-04-27 2013-08-21 トヨタ自動車株式会社 Damping insulator for fuel injection valve
US9132832B2 (en) 2011-11-08 2015-09-15 Toyota Jidosha Kabushiki Kaisha Power transmission device for vehicle
JP5867158B2 (en) * 2012-02-24 2016-02-24 Nok株式会社 Sealing structure
KR101980916B1 (en) * 2012-10-30 2019-05-21 두산인프라코어 주식회사 Linkage Structure for Bucket and Arm of Excavator
JP2016085047A (en) * 2014-10-23 2016-05-19 三菱電機株式会社 Ultrasonic sensor
CN115218048A (en) * 2021-04-15 2022-10-21 中国航发商用航空发动机有限责任公司 Pipe joint device

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