JP3669645B2

JP3669645B2 - Valve operating device for internal combustion engine

Info

Publication number: JP3669645B2
Application number: JP21731995A
Authority: JP
Inventors: 常雄今野
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1995-08-25
Filing date: 1995-08-25
Publication date: 2005-07-13
Anticipated expiration: 2015-08-25
Also published as: JPH0960513A

Description

【０００１】
【発明の属する技術分野】
本発明は、電磁石が発揮する電磁力により機関弁を開閉作動せしめるようにした内燃機関の動弁装置に関する。
【０００２】
【従来の技術】
従来、かかる装置は、たとえば米国特許公報３８８２８３３号および国際出願国際公開公報ＷＯ９５／００９５９号等により既に知られている。
【０００３】
【発明が解決しようとする課題】
上記従来のものでは、閉弁側および開弁側電磁石がアーマチュアの両側に対向して固定配置されており、機関弁の確実な閉弁着座状態を得るためには、該機関弁の閉弁時に閉弁側電磁石およびアーマチュア間にクリアランスを設定する必要があり、機関弁すなわちアーマチュアを閉弁位置に保持すべく閉弁側電磁石で発揮する吸引電磁力を比較的大きくするために閉弁側電磁石への通電電流を比較的大きくせざるを得ない。また機関弁着座時の速度制御は閉弁側電磁石への通電電流を調整することにより行なわれるが、閉弁側電磁石およびアーマチュア間のギャップが微小である領域では、電流の変化により電磁力が敏感に変化するものであり、閉弁側電磁石の吸引電磁力を精密に制御することが困難である。
【０００４】
本発明は、かかる事情に鑑みてなされたものであり、機関弁閉弁時の保持電流減少を図るとともに着座速度制御を容易とした内燃機関の動弁装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、請求項１記載の発明は、機関弁に連動、連結されたアーマチュアと、通電時に機関弁を閉弁方向に作動せしめる電磁力を前記アーマチュアに及ぼす閉弁側電磁石と、通電時に機関弁を開弁方向に作動せしめる電磁力を前記アーマチュアに及ぼす開弁側電磁石とを備え、両電磁石の非通電状態でアーマチュアが所定の中立位置に弾発保持される内燃機関の動弁装置において、閉弁側および開弁側電磁石は、それらの電磁石間の最大間隔を規制されるとともにアーマチュアに対する近接・離反移動を可能としてアーマチュアの両側に対向配置され、両電磁石間にそれらの電磁石を相互に離反する方向に付勢する弾発手段が設けられることを特徴とする。
【０００６】
また請求項２記載の発明は、上記請求項１記載の発明の構成に加えて、弾発手段が、両電磁石の非通電状態でアーマチュアを所定の中立位置に保持するばね力を発揮して両電磁石およびアーマチュア間にそれぞれ設けられる一対のばねから成ることを特徴とする。
【０００７】
請求項３記載の発明は、上記請求項１記載の発明の構成に加えて、両電磁石の非通電状態でアーマチュアを所定の中立位置に保持するばね力を発揮してアーマチュアを両側から付勢する一対のばねをさらに備えることを特徴とする。
【０００８】
請求項４記載の発明は、機関弁に連動、連結されたアーマチュアと、通電時に機関弁を閉弁方向に作動せしめる電磁力を前記アーマチュアに及ぼす閉弁側電磁石と、通電時に機関弁を開弁方向に作動せしめる電磁力を前記アーマチュアに及ぼす開弁側電磁石と、両電磁石の非通電状態でアーマチュアを所定の中立位置に保持するばね力を発揮して該アーマチュアを両側から付勢する第１および第２ばねとを備える内燃機関の動弁装置において、開弁側電磁石はアーマチュアの一側に対向して固定配置され、開弁側電磁石との間の最大間隔を規制されるとともにアーマチュアに対する近接・離反移動を可能としてアーマチュアの他側に閉弁側電磁石が対向配置され、該閉弁側電磁石と固定位置との間に閉弁側電磁石をアーマチュアから離反する方向に付勢する第３ばねが設けられることを特徴とする。
【０００９】
請求項５記載の発明は、上記請求項１ないし４記載のいずれかに記載の発明の構成に加えて、閉弁側電磁石が開弁側電磁石との間の間隔を最大とした規制位置に在る状態での閉弁側電磁石への通電に伴なって該閉弁側電磁石にアーマチュアが吸引されるときの反力により閉弁側電磁石が前記規制位置からアーマチュアに当接するまで移動する第１距離が、閉弁側電磁石がアーマチュアに当接した時点での機関弁の位置から該機関弁の着座時点での位置までの第２距離よりも大きく設定されることを特徴とする。
【００１０】
請求項６記載の発明は、上記請求項５記載の発明の構成に加えて、閉弁側電磁石がアーマチュアに当接する際の機関弁の閉弁方向への移動速度が略０近傍に設定されることを特徴とする。
【００１１】
請求項７記載の発明は、上記請求項５記載の発明の構成に加えて、第１距離から第２距離を減算した値が、最大の熱膨張状態に在る機関弁の閉弁着座時に閉弁側電磁石の規制位置への当接を回避し得る程度に設定されることを特徴とする。
【００１２】
請求項８記載の発明は、上記請求項４記載の発明の構成に加えて、第３ばねのセット荷重が閉弁側電磁石がその通電時に発揮する最大の電磁力よりも小さく設定され、閉弁側電磁石がアーマチュアに当接した状態で第３ばねが発揮するばね力が、そのときの第１および第２ばねのばね力の差によりアーマチュアに作用する開弁方向の力よりも大きく設定されることを特徴とする。
【００１３】
さらに請求項９記載の発明は、上記請求項１ないし４のいずれかに記載の発明の構成に加えて、固定のハウジング内に摺動可能に嵌合された閉弁側電磁石に、該ハウジングに接触して摺動抵抗を発揮する抵抗部材が設けられることを特徴とする。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１５】
図１ないし図４は本発明の第１実施例を示すものであり、図１は機関弁が中立位置に在る状態での動弁装置の縦断面図、図２は閉弁作動時の機関弁のリフトおよび閉弁側電磁石の移動状態を示す図、図３は機関弁が中立位置から閉弁位置側に移動した状態での図１に対応する縦断面図、図４は機関弁が閉弁位置に在る状態での図１に対応する縦断面図である。
【００１６】
先ず図１において、シリンダヘッド１には、弁口２を中央部に開口させた弁座３が燃焼室４に臨んで設けられ、弁座３に着座可能な吸気弁あるいは排気弁としての機関弁５に電磁駆動手段６₁が連結される。
【００１７】
この電磁駆動手段６₁は、シリンダヘッド１上に固設される非磁性材料製のハウジング７₁と、機関弁５のステム５ａに固設されてハウジング７₁内に移動可能に収納されるアーマチュア８と、該アーマチュア８を吸引して機関弁５を閉弁作動せしめる電磁力を発揮可能としてハウジング７₁内に配置される閉弁側電磁石９₁と、前記アーマチュア８を吸引して機関弁５を開弁作動せしめる電磁力を発揮可能としてハウジング７₁内に配置される開弁側電磁石１０₁と、機関弁５の閉弁方向に向けてアーマチュア８を付勢する第１ばね１１₁と、機関弁５の開弁方向に向けてアーマチュア８を付勢する第２ばね１２₁と、両電磁石９₁，１０₁間に設けられる弾発手段としての第３ばね１３₁とを備える。
【００１８】
ハウジング７₁は、下端を開放するとともに上端を閉じた円筒状に形成されるものであり、シリンダヘッド１の上面との間に作動室１４を形成するようにしてシリンダヘッド１の上面に結合される。機関弁５のステム５ａは、シリンダヘッド１に固設されるガイド筒１５に摺動可能に嵌合されて、作動室１４内に突入されており、該作動室１４内でステム５ａに円盤状のアーマチュア８が一体的に固設される。
【００１９】
閉弁側電磁石９₁は、アーマチュア８の上面側に開放した略Ｕ字状の横断面形状を有するとともにステム５ａと同軸のリング状に形成されたヨーク１６内にコイル１７が収納されて成るものであり、ヨーク１６には、その上端から半径方向外方に張出す鍔部１６ａが一体に設けられ、鍔部１６ａの外周面をハウジング７₁の内周面に摺接させるようにして閉弁側電磁石９₁がハウジング７₁の上部に摺動可能に嵌合される。また開弁側電磁石１０₁は、アーマチュア８の下面側に開放した略Ｕ字状の横断面形状を有するとともにステム５ａを同軸に囲繞するリング状に形成されたヨーク１８内にコイル１９が収納されて成るものであり、ヨーク１８には、その下端から半径方向外方に張出す鍔部１８ａが一体に設けられ、鍔部１８ａの外周面をハウジング７₁の内周面に摺接させるようにして開弁側電磁石１０₁がハウジング７₁の下部に摺動可能に嵌合される。すなわち閉弁側電磁石９₁および開弁側電磁石１０₁は、アーマチュア８に対する近接・離反移動を可能としてアーマチュア８の上下両側に対向配置され、それらの電磁石９₁，１０₁間の最大間隔は、閉弁側電磁石９₁がハウジング７₁の上端閉塞部に当接するとともに開弁側電磁石１０₁がシリンダヘッド１の上面に当接することにより規制されることになる。
【００２０】
第３ばね１３₁は、強磁性体ではない材料によりコイル状に形成されるものであり、閉弁側電磁石９₁の鍔部１６ａならびに開弁側電磁石１０₁の鍔部１８ａ間に縮設され、この第３ばね１３₁により両電磁石９₁，１０₁は相互に離反する方向に付勢されることになる。しかも第３ばね１３₁のセット荷重は、閉弁側電磁石９₁がその通電時に発揮する最大の電磁力よりも小さく設定される。
【００２１】
第１および第２ばね１１₁，１２₁は強磁性体ではない材料によりそれぞれコイル状に形成されるものであり、第１ばね１１₁は、作動室１４内でシリンダヘッド１の上面とアーマチュア８との間に縮設され、第２ばね１２₁は、作動室１４内でハウジング７₁の上端閉塞部とアーマチュア８との間に縮設される。而して第１および第２ばね１１₁，１２₁は、両電磁石９₁，１０₁の非通電状態に在ってはアーマチュア８を両電磁石９₁，１０₁間の中立位置に弾発保持する働きをし、その状態で機関弁５は半開状態に在る。
【００２２】
このような電磁駆動手段６₁におけるアーマチュア８および閉弁側電磁石９₁の作動について図２を参照しながら次に説明すると、アーマチュア８が中立位置に在る時刻ｔ₁で閉弁側電磁石９₁への通電を開始すると、アーマチュア８は閉弁側電磁石９₁で吸引されて閉弁方向に作動するが、その吸引反力により、閉弁側電磁石９₁は、第３ばね１３₁のばね力に抗してハウジング７₁の上端閉塞部に当接した規制位置からアーマチュア８側に移動し、時刻ｔ₂において図３で示すようにアーマチュア８に閉弁側電磁石９₁が当接する。而して閉弁側電磁石９₁が前記規制位置からアーマチュア８に当接するまで移動する第１距離δ₁は、閉弁側電磁石９₁がアーマチュア８に当接した時点ｔ ₂での機関弁５の位置から該機関弁５の着座時点ｔ ₃ での位置までの第２距離δ₂よりも大きく（δ₁＞δ₂）設定されている。しかも閉弁側電磁石９₁がアーマチュア８に当接する際のアーマチュア８すなわち機関弁５の閉弁方向への移動速度は略０となるように設定されている。
【００２３】
閉弁側電磁石９₁がアーマチュア８に接触して一体化されると、アーマチュア８には、第３ばね１３₁のばね力が閉弁方向に作用するとともに、圧縮されてばね力を増大した第２ばね１２₁のばね力から伸長されてばね力を減少した第１ばね１１₁のばね力を減算したばね力が開弁方向に作用することになり、この際の第３ばね１３₁の閉弁方向へのばね力が、第１および第２ばね１１₁，１２₁のばね力の差による開弁方向の力よりも大きく設定されている。したがって閉弁側電磁石９₁がアーマチュア８に接触した後には、アーマチュア８すなわち機関弁５はばね力による機械的な力で閉弁方向に駆動されることになり、時刻ｔ₃において図４で示すように機関弁５が閉弁着座することになる。
【００２４】
この機関弁５の閉弁着座状態では、ハウジング７₁の上端閉塞部と閉弁側電磁石９₁との間には、第１距離δ₁から第２距離δ₂を減算した値δ₃だけ間隔があくことになり、この距離δ₃は、最大の熱膨張状態に在る機関弁５の閉弁着座時に閉弁側電磁石９₁がハウジング７₁の上端閉塞部に当接することを回避し得る程度に設定される。
【００２５】
ところで、機関弁５が閉弁着座した後にあっては、閉弁側電磁石９₁およびアーマチュア８が相互間にクリアランスなく接触しているものであるので、閉弁側電磁石９₁への通電量を減少しても機関弁５の閉弁着座状態を維持し得るものであり、時刻ｔ₄で閉弁側電磁石９₁への通電量が減少される。
【００２６】
また機関弁５の開弁時には、閉弁側電磁石９₁への通電を停止して、開弁側電磁石１０₁に通電するようにすればよく、そうすればアーマチュア８が開弁側電磁石１０₁側に吸引され、機関弁５が開弁作動する。この際、機関弁５の開弁作動途中で開弁側電磁石１０₁がその吸引反力によってアーマチュア８側に移動して該アーマチュア８に当接するが、その後には第３ばね１３₁のばね力によって開弁側電磁石１０₁がシリンダヘッド１の上面に当接するまで移動することになる。
【００２７】
次にこの第１実施例の作用について説明すると、機関弁５の閉弁時にはその閉弁着座前に閉弁側電磁石９₁がアーマチュア８に当接され、その後、着座するまではばね力により機関弁５が機械的に閉弁作動せしめられることになる。したがって、機関弁５の閉弁着座直前の閉弁方向の荷重は、第１、第２および第３ばね１１₁，１２₁，１３₁のばね力設定により定められることになり、機械的な荷重制御により閉弁着座直前の作動速度を制御することができるので、閉弁側電磁石９₁の通電電流制御に比べて容易かつ信頼性の高い着座速度制御が可能となる。しかも閉弁側電磁石９₁がアーマチュア８にクリアランス無く接触するので、機関弁５を閉弁状態に保持するための閉弁側電磁石９₁の通電電流を比較的低く設定することが可能となる。
【００２８】
また閉弁側電磁石９₁がアーマチュア８に当接する際のアーマチュア８の速度が略０と設定されていることにより、閉弁側電磁石９₁のアーマチュア８への接触音を比較的低くすることができる。さらに閉弁側電磁石９₁がハウジング７₁の上端閉塞部に当接した規制位置からアーマチュア８に当接するまで移動する第１距離δ₁が、閉弁側電磁石９₁がアーマチュア８に当接した時点ｔ ₂での機関弁５の位置から該機関弁５の着座時点ｔ ₃ での位置までの第２距離δ₂よりも大きく設定されていることにより、機関弁５の確実な閉弁着座状態を得ることができ、第１距離δ₁から第２距離δ₂を減算した値δ₃が、最大の熱膨張状態に在る機関弁５の閉弁着座時に閉弁側電磁石９₁がハウジング７₁の上端閉塞部に当接することを回避し得る程度に設定されていることにより、機関弁５の熱膨張を補償して確実な閉弁着座状態を得ることができる。
【００２９】
さらに第１、第２および第３ばね１１₁，１２₁，１３₁は、強磁性体ではない材料から形成されるものであり、閉弁側電磁石９₁および開弁側電磁石１０₁の通電により生じる磁界にそれらのばね１１₁〜１３₁が悪影響を及ぼすことはない。
【００３０】
本発明の他の実施例として、開弁側電磁石１０₁はハウジング７₁の下端部に固定されていてもよい。
【００３１】
図５は本発明の第２実施例を示すものであり、上記第１実施例に対応する部分には同一の参照符号を付す。
【００３２】
この電磁駆動手段６₂は、シリンダヘッド１上に固設される非磁性材料製のハウジング７₁と、機関弁５のステム５ａに固設されてハウジング７₁内に移動可能に収納されるアーマチュア８と、該アーマチュア８を吸引して機関弁５を閉弁作動せしめる電磁力を発揮可能としてハウジング７₁内に配置される閉弁側電磁石９₂と、前記アーマチュア８を吸引して機関弁５を開弁作動せしめる電磁力を発揮可能としてハウジング７₁内に配置される開弁側電磁石１０₁と、機関弁５の閉弁方向に向けてアーマチュア８を付勢する第１ばね１１₁と、機関弁５の開弁方向に向けてアーマチュア８を付勢する第２ばね１２₁と、両電磁石９₂，１０₁間に設けられる弾発手段としての第３ばね１３₁とを備える。
【００３３】
閉弁側電磁石９₂は、アーマチュア８の上面側に開放した略Ｕ字状の横断面形状を有するとともにステム５ａと同軸のリング状に形成されたヨーク１６内にコイル１７が収納されて成るものであり、ヨーク１６には、その上端から半径方向外方に張出してハウジング７₁の内周面に摺接する鍔部１６ａが一体に設けられ、該鍔部１６ａの外周面には、ハウジング７₁の内周面に接触して摺動抵抗を発揮する抵抗部材としてのＯリング２０が装着される。
【００３４】
この第２実施例によれば、上記第１実施例の効果に加えて、機関弁５の閉弁着座速度をさらに弱めることが可能となる。
【００３５】
図６は本発明の第３実施例を示すものであり、上記各実施例に対応する部分には同一の参照符号を付す。
【００３６】
この電磁駆動手段６₃は、シリンダヘッド１上に固設される非磁性材料製のハウジング７₂と、機関弁５のステム５ａに固設されてハウジング７₂内に移動可能に収納されるアーマチュア８と、該アーマチュア８を吸引して機関弁５を閉弁作動せしめる電磁力を発揮可能としてハウジング７₂内に配置される閉弁側電磁石９₃と、前記アーマチュア８を吸引して機関弁５を開弁作動せしめる電磁力を発揮可能としてハウジング７₂内に配置される開弁側電磁石１０₂と、両電磁石９₃，１０₂間に設けられる弾発手段１３₂とを備える。
【００３７】
閉弁側電磁石９₃は、アーマチュア８の上面側に開放した略Ｕ字状の横断面形状を有するとともにステム５ａと同軸のリング状に形成されたヨーク１６内にコイル１７が収納されて成るものであり、ヨーク１６には、その上端から半径方向内方に張出す鍔部１６ｂが一体に設けられ、ヨーク１６の外面をハウジング７₂の内面に摺接させるようにして閉弁側電磁石９₃がハウジング７₂の上部に摺動可能に嵌合される。また開弁側電磁石１０₂は、アーマチュア８の下面側に開放した略Ｕ字状の横断面形状を有するとともにステム５ａを同軸に囲繞するリング状に形成されたヨーク１８内にコイル１９が収納されて成るものであり、ヨーク１８には、その下端から半径方向内方に張出す鍔部１８ｂが一体に設けられ、ヨーク１８の外面をハウジング７₂の内面に摺接させるようにして開弁側電磁石１０₂がハウジング７₂の下部に摺動可能に嵌合される。すなわち閉弁側電磁石９₃および開弁側電磁石１０₂は、アーマチュア８に対する近接・離反移動を可能としてアーマチュア８の上下両側に対向配置され、それらの電磁石９₃，１０₂間の最大間隔は、閉弁側電磁石９₃がハウジング７₂の上端閉塞部に当接するとともに開弁側電磁石１０₂がシリンダヘッド１の上面に当接することにより規制されることになる。
【００３８】
弾発手段１３₂は、開弁側電磁石１０₂における鍔部１８ｂおよびアーマチュア８間に縮設される第１ばね１１₂と、閉弁側電磁石９₃における鍔部１６ｂおよびアーマチュア８間に縮設される第２ばね１２₂とから成るものであり、この弾発手段１３₂は、閉弁側電磁石９₃および開弁側電磁石１０₂を相互に離反する方向のばね力を発揮するとともに、両電磁石９₃，１０₂の非通電状態ではアーマチュア８を所定の中立位置に保持するばね力を発揮する。
【００３９】
この第３実施例によれば、閉弁側電磁石９₃への通電により機関弁５を閉弁作動させると、閉弁側電磁石９₃がアーマチュア８側に移動して該アーマチュア８に当接し、その後は、伸長状態となってばね力が比較的弱くなった第１ばね１１₂により機関弁５が閉弁着座することになる。したがって上記第１実施例と同様の効果を奏することができ、しかも弾発手段１３₂は、アーマチュア８を中立位置に保持する働きをもするので、ばねの個数を減らして部品点数の低減に寄与することができる。
【００４０】
以上、本発明の実施例を詳述したが、本発明は上記実施例に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行なうことが可能である。
【００４１】
【発明の効果】
以上のように、請求項１、３および４記載の発明によれば、機関弁の閉弁着座前に閉弁側電磁石をアーマチュアに当接させ、その後、着座するまではばね力により機関弁を機械的に閉弁作動せしめることにより、容易かつ信頼性の高い着座速度制御が可能となり、しかも閉弁側電磁石をアーマチュアにクリアランス無く接触せしめることにより機関弁を閉弁状態に保持するための閉弁側電磁石の通電電流を比較的低く設定することができる。
【００４２】
また請求項２記載の発明によれば、アーマチュアを中立位置に保持する働きを弾発手段で兼用することにより部品点数を低減することができる。
【００４３】
請求項５記載の発明によれば、閉弁側電磁石が規制位置からアーマチュアに当接するまで移動する第１距離を、閉弁側電磁石がアーマチュアに当接した時点での機関弁の位置から該機関弁の着座時点での位置までの第２距離よりも大きく設定したことにより、機関弁の確実な閉弁着座状態を得ることができる。
【００４４】
請求項６記載の発明によれば、閉弁側電磁石がアーマチュアに当接する際の機関弁の閉弁方向への移動速度が略０近傍であることにより、アーマチュアへの閉弁側電磁石の接触音を減少させることができる。
【００４５】
請求項７記載の発明によれば、第１距離から第２距離を減算した値の設定により、機関弁が最大熱膨張状態にあっても閉弁側電磁石の規制位置への当接が回避され、熱膨張を補償して確実な閉弁着座状態を得ることができる。
【００４６】
請求項８記載の発明によれば、各ばねのばね力および閉弁側電磁石の電磁力設定により、機関弁の閉弁着座前に閉弁側電磁石をアーマチュアに当接させた後に機関弁をばね力より着座させるようにした作動を確実に得ることができる。
【００４７】
さらに請求項９記載の発明によれば、抵抗部材で摺動抵抗を発揮せしめることにより機関弁の閉弁着座速度をさらに緩やかにすることができる。
【図面の簡単な説明】
【図１】第１実施例において機関弁が中立位置に在る状態での動弁装置の縦断面図である。
【図２】閉弁作動時の機関弁のリフトおよび閉弁側電磁石の移動状態を示す図である。
【図３】機関弁が中立位置から閉弁位置側に移動した状態での図１に対応する縦断面図である。
【図４】機関弁が閉弁位置に在る状態での図１に対応する縦断面図である。
【図５】第２実施例の図１に対応した縦断面図である。
【図６】第３実施例の図１に対応した縦断面図である。
【符号の説明】
５・・・機関弁
７₁・・・ハウジング
８・・・アーマチュア
９₁，９₂，９₃・・・閉弁側電磁石
１０₁，１０₂・・・開弁側電磁石
１１₁，１１₂・・・第１ばね
１２₁，１２₂・・・第２ばね
１３₁・・・弾発手段としての第３ばね
１３₂・・・弾発手段
２０・・・抵抗部材としてのＯリング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve operating apparatus for an internal combustion engine that opens and closes an engine valve by electromagnetic force exerted by an electromagnet.
[0002]
[Prior art]
Conventionally, such an apparatus is already known from, for example, US Pat. No. 3,882,833 and International Application Publication No. WO95 / 00959.
[0003]
[Problems to be solved by the invention]
In the above conventional one, the valve closing side and valve opening side electromagnets are fixedly arranged opposite to both sides of the armature, and in order to obtain a reliable valve seating state of the engine valve, when the engine valve is closed, It is necessary to set a clearance between the valve-closing electromagnet and the armature. To keep the engine valve, that is, the armature, in the valve-closing position, the valve-side electromagnet exerts a relatively large suction electromagnetic force. The energizing current must be relatively large. In addition, speed control when the engine valve is seated is performed by adjusting the energization current to the valve closing side electromagnet. However, in the region where the gap between the valve closing side electromagnet and the armature is very small, the electromagnetic force is sensitive to changes in the current. It is difficult to precisely control the attraction electromagnetic force of the valve-closing electromagnet.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a valve operating device for an internal combustion engine that reduces the holding current when the engine valve is closed and facilitates seating speed control.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 includes an armature linked to and coupled to an engine valve, and a valve-closing electromagnet that exerts an electromagnetic force on the armature to actuate the engine valve in a valve closing direction when energized. A valve-opening electromagnet that exerts an electromagnetic force on the armature to actuate the engine valve in the valve opening direction when energized, and the operation of the internal combustion engine in which the armature is elastically held at a predetermined neutral position when both the electromagnets are not energized. In the valve device, the valve-closing side and valve-opening side electromagnets are arranged opposite to each other on both sides of the armature so that the maximum distance between the electromagnets is regulated and the armature can be moved close to and away from the electromagnet. It is characterized in that a resilient means for urging them in directions away from each other is provided.
[0006]
Further, in the invention described in claim 2, in addition to the configuration of the invention described in claim 1 above, the elastic means exerts a spring force for holding the armature in a predetermined neutral position when both electromagnets are not energized. It consists of a pair of springs provided between the electromagnet and the armature, respectively.
[0007]
In addition to the configuration of the invention described in claim 1, the invention described in claim 3 exerts a spring force that holds the armature in a predetermined neutral position when both electromagnets are not energized to bias the armature from both sides. Further comprising a pair of springs.
[0008]
According to a fourth aspect of the present invention, there is provided an armature interlocked with and coupled to an engine valve, a valve-closing electromagnet that exerts an electromagnetic force on the armature to actuate the engine valve in a valve closing direction when energized, and the engine valve opened when energized. A valve-opening electromagnet that exerts an electromagnetic force acting on the armature on the armature, and a spring force that holds the armature in a predetermined neutral position when both the electromagnets are not energized to bias the armature from both sides In the valve operating apparatus for an internal combustion engine including the second spring, the valve-opening electromagnet is fixedly disposed facing one side of the armature, and the maximum distance between the valve-opening electromagnet is restricted and the proximity to the armature A valve-closing electromagnet is arranged opposite to the other side of the armature to enable separation movement, and the valve-closing electromagnet is separated from the armature between the valve-closing electromagnet and the fixed position. Wherein the third spring for biasing direction is provided.
[0009]
According to a fifth aspect of the invention, in addition to the configuration of the invention according to any one of the first to fourth aspects, the valve-closing electromagnet is located at a restriction position where the distance between the valve-opening electromagnet is maximized. The first distance by which the valve-closing electromagnet moves from the restriction position until it contacts the armature due to the reaction force when the armature is attracted to the valve-closing electromagnet as the valve-closing electromagnet is energized However, it is characterized in that it is set to be larger than the second distance from the position of the engine valve when the valve-closing electromagnet contacts the armature to the position when the engine valve is seated .
[0010]
According to the sixth aspect of the invention, in addition to the configuration of the fifth aspect of the invention, the moving speed of the engine valve in the valve closing direction when the valve-closing electromagnet contacts the armature is set to approximately zero. It is characterized by that.
[0011]
According to the seventh aspect of the invention, in addition to the configuration of the fifth aspect of the invention, the value obtained by subtracting the second distance from the first distance is closed when the engine valve in the maximum thermal expansion state is closed. The valve-side electromagnet is set to such an extent that it can avoid contact with the restriction position.
[0012]
According to the eighth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the set load of the third spring is set smaller than the maximum electromagnetic force exerted by the valve-closing electromagnet when energized. The spring force exerted by the third spring when the side electromagnet is in contact with the armature is set larger than the force in the valve opening direction acting on the armature due to the difference in spring force between the first and second springs at that time. It is characterized by that.
[0013]
In addition to the configuration of any of the first to fourth aspects of the present invention, a ninth aspect of the present invention is directed to a valve-closing electromagnet slidably fitted in a fixed housing. A resistance member that exhibits sliding resistance upon contact is provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0015]
1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a valve operating apparatus in a state where an engine valve is in a neutral position, and FIG. 2 is an engine at the time of valve closing operation. FIG. 3 is a longitudinal sectional view corresponding to FIG. 1 in a state where the engine valve is moved from the neutral position to the valve closing position side, and FIG. 4 is a diagram showing the state in which the engine valve is closed. It is a longitudinal cross-sectional view corresponding to FIG. 1 in the state which exists in a valve position.
[0016]
First, in FIG. 1, a cylinder seat 1 is provided with a valve seat 3 with a valve port 2 opened in the center facing the combustion chamber 4, and an engine valve as an intake valve or exhaust valve that can be seated on the valve seat 3. 5 electromagnetic drive means ₆₁ is connected to.
[0017]
The electromagnetic driving means ₆₁ is an armature movably accommodated and the housing ₇₁ made of non-magnetic material fixedly provided on the cylinder head 1, is fixed to the stem 5a of the engine valve 5 into the housing 7 ₁ 8, a valve-closing electromagnet 9 ₁ arranged in the housing 7 ₁ an electromagnetic force allowed to valve closing the engine valve 5 by sucking the armature 8 as capable of exhibiting, engine valve by attracting the armature 8 5 the valve-opening side electromagnet 10 ₁ arranged in the housing 7 in ₁ as capable of exhibiting an electromagnetic force allowed to valve-opening, a first spring 11 ₁ for urging the armature 8 towards the closing direction of the engine valve 5, toward the valve opening direction of the engine valve 5 comprises a second spring 12 ₁ for urging the armature 8, and a third spring 13 ₁ as elastic means provided on both electromagnets 9 _1, 10 between _1.
[0018]
The housing ₇₁ is intended to be formed in a cylindrical shape closed upper end with opening the lower end, it is coupled to the upper surface of the cylinder head 1 so as to form a working chamber 14 between the upper surface of the cylinder head 1 The The stem 5a of the engine valve 5 is slidably fitted into a guide cylinder 15 fixed to the cylinder head 1, and is inserted into the working chamber 14, and the stem 5a in the working chamber 14 has a disk shape. The armature 8 is fixed integrally.
[0019]
Valve-closing electromagnet 9 _1, which coils 17 in the yoke 16 formed in the stem 5a and coaxial ring-shaped and has a substantially U-shaped cross section that is open on the top side of the armature 8 is formed by housing and a, the yoke 16, the Zhang put the flange portion 16a radially outward from the upper end is provided integrally with the outer peripheral surface of the flange portion 16a so as to sliding contact with the inner peripheral surface of the housing ₇₁ closed side electromagnet 9 ₁ are slidably fitted in the upper portion of the housing _71. The valve-opening electromagnet 10 _1, the coil 19 in the yoke 18 formed into a ring shape surrounding the stem 5a coaxially and having a substantially U-shaped cross section that is open on the lower surface side of the armature 8 is accommodated are those consisting Te, the yoke 18, the flange portion 18a which overhangs radially outwardly is provided integrally from the lower end, so as to sliding contact with the outer peripheral surface of the flange portion 18a on the inner peripheral surface of the housing 7 ₁ Then, the valve-opening side electromagnet 10 ₁ is slidably fitted to the lower part of the housing 7 ₁ . That is, the valve-closing electromagnet 9 ₁ and the valve-opening electromagnet 10 ₁ are arranged opposite to each other on the upper and lower sides of the armature 8 so as to be able to approach and move away from the armature 8, and the maximum distance between the electromagnets 9 ₁ , 10 ₁ is valve-closing electromagnet 9 ₁ is the valve-opening electromagnet 10 ₁ with contacts in the upper closed portion of the housing ₇₁ is restricted by contact with the upper surface of the cylinder head 1.
[0020]
Third spring 13 _1, by not a ferromagnetic material is intended to be formed into a coil, is provided in a compressed state between the valve-closing electromagnet 9 ₁ of the flange portion 16a and the valve-opening electromagnet 10 ₁ of the flange portion 18a The third spring 13 ₁ urges the electromagnets 9 ₁ and 10 ₁ in directions away from each other. In addition, the set load of the third spring 13 ₁ is set smaller than the maximum electromagnetic force that the valve-closing electromagnet 9 ₁ exhibits when energized.
[0021]
The first and second springs 11 ₁ and 12 ₁ are each formed in a coil shape from a material that is not a ferromagnetic material, and the first spring 11 ₁ is formed in the working chamber 14 from the upper surface of the cylinder head 1 and the armature 8. It is provided in a compressed state between the second spring 12 ₁ is provided in a compressed state between the upper closed portion and the armature 8 of the housing 7 ₁ working chamber 14. First and second springs 11 Thus _1, 12 _1, elastic holding the armature 8 In the non-energized state of the two electromagnets 9 _1, 10 ₁ in the neutral position between the two electromagnets 9 _1, 10 ₁ In this state, the engine valve 5 is in a half-open state.
[0022]
Next will be described with reference to FIG. 2 the operation of the armature 8 and the valve-closing electromagnet 9 ₁ in such an electromagnetic driving means _61, valve-closing electromagnet 9 ₁ at time t ₁ the armature 8 is in the neutral position When energization is started, the armature 8 is attracted by the valve-closing electromagnet 9 ₁ and operates in the valve-closing direction. Due to the attraction reaction force, the valve-closing electromagnet 9 ₁ causes the spring force of the third spring 13 ₁ . against it to move from contact with the restricting position to the upper closed portion of the housing ₇₁ in the armature 8 side, at time t ₂ is the valve-closing electromagnet 9 ₁ on the armature 8 as shown in Figure 3 abuts. First distance [delta] ₁ of the valve-closing electromagnet 9 ₁ Thus to move until it abuts against the armature 8 from the regulating position, the engine valve at the time t ₂ the valve-closing electromagnet 9 ₁ is in contact with the armature 8 5 Is set to be larger than the second distance δ ₂ from the position of the engine valve 5 to the position at the seating time t ₃ of the engine valve 5 (δ ₁ > δ ₂ ). Moreover the moving speed of the valve-closing electromagnet 9 ₁ in the valve closing direction of the armature 8 i.e. the engine valve 5 when in contact with the armature 8 is set to be substantially 0.
[0023]
When the valve-closing electromagnet 9 ₁ contacts and is integrated with the armature 8, the spring force of the third spring 13 ₁ acts on the armature 8 in the valve closing direction and is compressed to increase the spring force. will be 2 springs 12 ₁ from the spring force is extended first spring 11 _first spring force subtracted spring force reduces the spring force acts in the opening direction, the third spring 13 ₁ closed at this time The spring force in the valve direction is set larger than the force in the valve opening direction due to the difference in spring force between the first and second springs 11 ₁ and 12 ₁ . Thus after the valve-closing electromagnet 9 ₁ is in contact with the armature 8, the armature 8 i.e. the engine valve 5 will be driven in the closing direction by the mechanical force due to the spring force, shown at time t ₃ in FIG. 4 Thus, the engine valve 5 is seated closed.
[0024]
The closed seating state of the engine valve 5 and between the upper closure portion and the valve-closing electromagnet 9 ₁ of the housing 7 _1, by a value [delta] ₃ of the first distance [delta] ₁ obtained by subtracting the second distance [delta] ₂ Interval will be adversely, the distance [delta] ₃ is the valve-closing electromagnet 9 ₁ when the valve is closed seating of the engine valve 5 located at the maximum thermal expansion conditions may be avoided that abuts against the upper closed portion of the housing 7 ₁ Set to degree.
[0025]
Incidentally, in the after engine valve 5 is closed seated, so the valve-closing electromagnet 9 ₁ and the armature 8 are those which are in contact without clearance therebetween, the power supply amount to the valve-closing electromagnet 9 ₁ be reduced are those capable of maintaining a closed sitting state of the engine valve 5, power supply amount to the valve-closing electromagnet 9 ₁ is decreased at time t _4.
[0026]
Further, when the engine valve 5 is opened, the energization to the valve closing side electromagnet 9 ₁ may be stopped and the valve opening side electromagnet 10 ₁ may be energized. Then, the armature 8 is opened to the valve opening side electromagnet 10 _1. The engine valve 5 is opened. At this time, although the valve-opening electromagnet 10 ₁ in the middle opening operation of the engine valve 5 is brought into contact with the armature 8 to move the armature 8 side by its suction reaction force, then the spring force of the third spring 13 ₁ valve-opening electromagnet 10 ₁ will move until it abuts against the upper surface of the cylinder head 1 by.
[0027]
Next, to explain the action of this first embodiment, at the time of closing of the engine valve 5 valve-closing electromagnet 9 ₁ is brought into contact with the armature 8 before its closing seat, then the engine by the spring force until seated The valve 5 is mechanically closed. Therefore, the load in the closing direction immediately before the engine valve 5 is seated is determined by the spring force setting of the first, second and third springs 11 ₁ , 12 ₁ , 13 ₁ , and mechanical load it is possible to control the operation speed immediately before closing the seat by the control, it is possible to sit the speed control easy and reliable than the energization current control valve-closing electromagnet 9 _1. Moreover, since the valve-closing electromagnet 9 ₁ contacts without clearance on the armature 8, it is possible to set a relatively low current supplied valve-closing electromagnet 9 ₁ for holding the engine valve 5 in a closed state.
[0028]
Further, by the speed of the armature 8 when valve-closing electromagnet 9 ₁ comes into contact with the armature 8 is set to approximately 0, be relatively low noise generated from this contact with the valve-closing electromagnet 9 ₁ of the armature 8 it can. Furthermore the first distance [delta] ₁ of the valve-closing electromagnet 9 ₁ moves from contact with the restricting position to the upper closed portion of the housing ₇₁ until it abuts against the armature 8, the valve-closing electromagnet 9 ₁ is in contact with the armature 8 Since the engine valve 5 is set to be larger than the second distance δ ₂ from the position of the engine valve 5 at the time point t ₂ to the position at the seating time point t ₃ of the engine valve 5, the engine valve 5 is reliably closed and seated. can be obtained, the first distance [delta] ₁ from the value [delta] ₃ obtained by subtracting the second distance [delta] ₂ is the valve-closing electromagnet 9 ₁ when the valve is closed seating of the engine valve 5 located at the maximum thermal expansion conditions housing 7 _By being set to such an extent that contact with the upper end closed portion of ₁ can be avoided, it is possible to compensate for thermal expansion of the engine valve 5 and to obtain a reliable closed seating state.
[0029]
Further, the first, second, and third springs 11 ₁ , 12 ₁ , 13 ₁ are made of a material that is not a ferromagnetic material, and are energized by the valve closing side electromagnet 9 ₁ and the valve opening side electromagnet 10 ₁ . The springs 11 _{1 to} 13 ₁ do not adversely affect the generated magnetic field.
[0030]
Another embodiment of the present invention, the valve-opening electromagnet 10 ₁ may be fixed to the lower end of the housing _71.
[0031]
FIG. 5 shows a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0032]
The electromagnetic driving means 6 _2, a non-magnetic material made of a housing ₇₁ which is fixed on the cylinder head 1, the armature being movably accommodated is fixed to the stem 5a of the engine valve 5 into the housing 7 ₁ 8, a valve-closing electromagnet 9 ₂ disposed in the housing 7 ₁ an electromagnetic force allowed to valve closing the engine valve 5 by sucking the armature 8 as capable of exhibiting, engine valve by attracting the armature 8 5 the valve-opening side electromagnet 10 ₁ arranged in the housing 7 in ₁ as capable of exhibiting an electromagnetic force allowed to valve-opening, a first spring 11 ₁ for urging the armature 8 towards the closing direction of the engine valve 5, toward the valve opening direction of the engine valve 5 comprises a second spring 12 ₁ for urging the armature 8, and a third spring 13 ₁ as elastic means provided on both electromagnets 9 _2, 10 between _1.
[0033]
Valve-closing electromagnet 9 _2, which coils 17 in the yoke 16 formed in the stem 5a and coaxial ring-shaped and has a substantially U-shaped cross section that is open on the top side of the armature 8 is formed by housing , and the yoke 16 is in sliding contact with the flange portion 16a on the inner peripheral surface of the housing ₇₁ Te projecting radially outwards is provided integrally from the upper end, on the outer peripheral surface of the collar portion 16a, the housing 7 ₁ An O-ring 20 is mounted as a resistance member that comes into contact with the inner peripheral surface and exhibits sliding resistance.
[0034]
According to the second embodiment, in addition to the effects of the first embodiment, the valve seating speed of the engine valve 5 can be further reduced.
[0035]
FIG. 6 shows a third embodiment of the present invention, and portions corresponding to the respective embodiments are given the same reference numerals.
[0036]
The electromagnetic driving means 6 ₃ includes a nonmagnetic material made of the housing 7 ₂ fixedly provided on the cylinder head 1, the armature being movably accommodated is fixed to the stem 5a of the engine valve 5 into the housing 7 in ₂ 8, a valve-closing electromagnet 9 ₃ arranged in the housing 7 in ₂ an electromagnetic force allowed to valve closing the engine valve 5 by sucking the armature 8 as capable of exhibiting, engine valve by attracting the armature 8 5 A valve-opening electromagnet 10 ₂ disposed in the housing 7 ₂ so as to be able to exert an electromagnetic force for opening the valve, and a resilient means 13 ₂ provided between the electromagnets 9 ₃ and 10 ₂ .
[0037]
Valve-closing electromagnet 9 _3, which coils 17 in the yoke 16 formed in the stem 5a and coaxial ring-shaped and has a substantially U-shaped cross section that is open on the top side of the armature 8 is formed by housing , and the yoke 16, the flange portion 16b is integrally provided with the overhangs radially inward from the upper end, the valve-closing electromagnet 9 ₃ an outer surface of the yoke 16 so as to be in sliding contact with the inner surface of the housing 7 ₂ There is slidably fitted in the upper portion of the housing 7 _2. The valve-opening electromagnet 10 _2, the coil 19 in the yoke 18 formed into a ring shape surrounding the stem 5a coaxially and having a substantially U-shaped cross section that is open on the lower surface side of the armature 8 is accommodated are those consisting Te, the yoke 18, the lower end overhangs radially inward from the flange portion 18b is integrally provided, the valve opening side by the outer surface of the yoke 18 so as to sliding contact with the inner surface of the housing 7 ₂ An electromagnet 10 ₂ is slidably fitted to the lower part of the housing 7 ₂ . That is, the valve-closing electromagnet 9 ₃ and the valve-opening electromagnet 10 ₂ are arranged opposite to each other on the upper and lower sides of the armature 8 so as to be able to move close to and away from the armature 8, and the maximum distance between the electromagnets 9 ₃ and 10 ₂ is valve-closing electromagnet 9 ₃ is the valve-opening electromagnet 10 ₂ is restricted by contact with the upper surface of the cylinder head 1 with contact to the upper closed portion of the housing 7 _2.
[0038]
The elastic means 13 ₂ is contracted between the first spring 11 ₂ that is contracted between the flange 18 b and the armature 8 in the valve-opening electromagnet 10 _2, and between the flange 16 b and the armature 8 in the valve-closing electromagnet 9 ₃ . are those of a second spring 12 ₂ which is, the elastic means 13 ₂ is adapted to exert the direction of the spring force of separating the valve-closing electromagnet 9 ₃ and the valve-opening side electromagnet 10 ₂ to each other, both When the electromagnets 9 ₃ and 10 ₂ are not energized, a spring force is exerted to hold the armature 8 in a predetermined neutral position.
[0039]
According to the third embodiment, when the closed actuating the engine valve 5 by energizing the valve-closing electromagnet 9 _3, contact with the armature 8 is the valve-closing electromagnet 9 ₃ moves the armature 8 side, Thereafter, the engine valve 5 by the first spring 11 ₂ a spring force is relatively weak so that the closing seat becomes extended state. Therefore it is possible to achieve the same effect as in the first embodiment, moreover resilient means 13 _2, so that also serves to hold the armature 8 to the neutral position, contributes to reducing the number of parts to reduce the number of spring can do.
[0040]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0041]
【The invention's effect】
As described above, according to the first, third, and fourth aspects of the invention, the valve-closing electromagnet is brought into contact with the armature before the engine valve is closed and seated. By mechanically closing the valve, it is possible to easily and reliably control the seating speed, and to close the engine valve in the closed state by bringing the valve-closing electromagnet into contact with the armature without any clearance. The energizing current of the side electromagnet can be set relatively low.
[0042]
According to the second aspect of the invention, the number of parts can be reduced by combining the function of holding the armature in the neutral position with the elastic means.
[0043]
According to the fifth aspect of the present invention, the first distance that the valve-closing electromagnet moves from the restriction position until it contacts the armature is changed from the position of the engine valve when the valve-closing electromagnet contacts the armature to the engine. By setting it to be larger than the second distance to the position at the time when the valve is seated, a reliable closed seating state of the engine valve can be obtained.
[0044]
According to the sixth aspect of the present invention, since the moving speed of the engine valve in the valve closing direction when the valve-closing electromagnet abuts on the armature is approximately zero, the contact sound of the valve-closing electromagnet to the armature Can be reduced.
[0045]
According to the seventh aspect of the present invention, by setting the value obtained by subtracting the second distance from the first distance, contact of the valve-closing electromagnet with the restriction position is avoided even when the engine valve is in the maximum thermal expansion state. Thus, it is possible to compensate for the thermal expansion and obtain a reliable valve-sitting state.
[0046]
According to the eighth aspect of the present invention, the springs of the respective springs and the electromagnetic force of the valve-closing electromagnet are set so that the engine valve is spring-loaded after the valve-closing electromagnet is brought into contact with the armature before the engine valve is closed. It is possible to reliably obtain an operation in which the user is seated by force.
[0047]
According to the ninth aspect of the present invention, the valve seating speed of the engine valve can be further moderated by exerting sliding resistance with the resistance member.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a valve operating apparatus in a state where an engine valve is in a neutral position in a first embodiment.
FIG. 2 is a diagram showing a lift state of an engine valve and a moving state of a valve closing side electromagnet during valve closing operation.
FIG. 3 is a longitudinal sectional view corresponding to FIG. 1 in a state where the engine valve is moved from the neutral position to the valve closing position.
FIG. 4 is a longitudinal sectional view corresponding to FIG. 1 in a state where the engine valve is in a valve closing position.
FIG. 5 is a longitudinal sectional view corresponding to FIG. 1 of a second embodiment.
FIG. 6 is a longitudinal sectional view corresponding to FIG. 1 of a third embodiment.
[Explanation of symbols]
5 ... Engine valve 7 ₁ ... Housing 8 ... Armature 9 ₁ , 9 ₂ , 9 ₃ ... Valve closing side electromagnets 10 ₁ , 10 ₂ ... Valve opening side electromagnets 11 ₁ , 11 _2. ..First springs 12 ₁ , 12 ₂ ... Second spring 13 ₁ ... Third spring 13 ₂ as a resilient means... Elastic means 20.

Claims

In conjunction with the engine valve (5), and linked armature (8), the valve-closing electromagnet (9 ₁ exert an electromagnetic force allowed to operate the engine valve (5) in a valve closing direction when energized the armature (8), 9 ₂ , 9 ₃ ) and a valve-opening side electromagnet (10 ₁ , 10 ₂ ) that exerts an electromagnetic force on the armature (8) that operates the engine valve (5) in the valve opening direction when energized. ₁ , 9 ₂ , 9 ₃ ; 10 ₁ , 10 ₂ ) In a valve operating apparatus for an internal combustion engine in which the armature (8) is elastically held at a predetermined neutral position, the valve closing side and valve opening side electromagnets (9 ₁ , 9 ₂ , 9 ₃ ; 10 ₁ , 10 ₂ ) are controlled in the maximum distance between their electromagnets (9 ₁ , 9 ₂ , 9 ₃ ; 10 ₁ , 10 ₂ ) and armature (8) The armature (8) is placed opposite to both sides to enable movement close to and away from the armature, Electromagnets (9 _1, 9 _2, 9 _3; 10 _1, 10 ₂₎ thereof electromagnets between ₍₁ 9, 9 _2, 9 _3; 10 _1, 10 ₂₎ is biased in a direction away from each other elastically Means (13 ₁ , 13 ₂ ) are provided.

The elastic means (13 ₂ ) exerts a spring force that holds the armature (8) in a predetermined neutral position when both the electromagnets (9 ₃ , 10 ₂ ) are not energized to produce both the electromagnets (9 ₃ , 10 ₂ ). And a pair of springs (11 ₂ , 12 ₂ ) respectively provided between the armature (8) and the armature (8).

A pair of springs (11) that exerts a spring force to hold the armature (8) in a predetermined neutral position while the electromagnets (9 ₁ , 9 ₂ ; 10 ₁ ) are not energized to bias the armature (8) from both sides The valve operating apparatus for an internal combustion engine according to claim 1, further comprising ₁ , 12 ₁ ).

In conjunction with the engine valve (5), and linked armature (8), the valve-closing electromagnet (9 ₁ exert an electromagnetic force allowed to operate the engine valve (5) in a valve closing direction when energized the armature (8), 9 ₂ ), a valve-opening electromagnet (10 ₁ ) that exerts an electromagnetic force on the armature (8) to actuate the engine valve (5) in the valve opening direction when energized, and both electromagnets (9 ₁ , 9 ₂ ; 10 ₁ ) The first and second springs (11 ₁ , 12 ₁ ) that exert a spring force to hold the armature (8) in a predetermined neutral position in a non-energized state and bias the armature (8) from both sides. In the valve operating device of the internal combustion engine, the valve opening side electromagnets (10 ₁ , 10 ₂ ) are fixedly arranged facing one side of the armature (8), and are located between the valve opening side electromagnets (10 ₁ , 10 ₂ ). Proximity to armature (8) with maximum spacing regulated Valve-closing electromagnet in the other side (9 _1, 9 ₂₎ of the armature (8) as a possible anti-movement is opposed, closed between the fixed position and the valve closing electromagnet (9 _1, 9 ₂₎ 3. A valve operating system for an internal combustion engine, comprising a third spring (13 ₁ ) for urging the side electromagnets (9 ₁ , 9 ₂ ) in a direction away from the armature (8).

Valve-closing electromagnet (9 _1, 9 _2, 9 ₃₎ valve-opening electromagnet (10 _1, 10 ₂₎ the valve-closing electromagnet in a state located at the restricting position of the maximum spacing between the (9 ₁ , 9 ₂ valve closing electromagnet (9 ₁ is accompanied to the energization of the), 9 _2, 9 ₃₎ in the valve-closing electromagnet (9 ₁ by the reaction force when the armature (8) is sucked, 9 ₂ , 9 ₃ ) moves from the restriction position until the armature (8) contacts the armature (8), the first distance (δ ₁ ) moves so that the valve-closing electromagnets (9 ₁ , 9 ₂ , 9 ₃ ) contact the armature (8). time points (t _2), wherein the position of the engine valve (5) being second distance ([delta] ₂₎ greater than to the position at the seating point of the engine valve (5) (t ₃₎ at The valve operating apparatus for an internal combustion engine according to any one of claims 1 to 4.

The moving speed in the valve closing direction of the engine valve (5) when the valve-closing electromagnets (9 ₁ , 9 ₂ , 9 ₃ ) are in contact with the armature (8) is set to be approximately zero. 6. A valve operating apparatus for an internal combustion engine according to claim 5.

First distance ([delta] ₁₎ the value obtained by subtracting the second distance ([delta] ₂₎ from the valve-closing side electromagnet (9 ₁ when the valve is closed seating of the engine valve located at maximum heat expanded state (5), 9 _2, 9. The valve operating apparatus for an internal combustion engine according to claim 5, wherein the valve operating apparatus is set to such an extent that contact with the restriction position of 9 ₃ ) can be avoided.

The third set load of the spring (13 ₁₎ is set smaller than the maximum electromagnetic force valve-closing electromagnet (9 _1, 9 ₂₎ to exert upon its energization, the valve-closing electromagnet (9 _1, 9 ₂₎ The spring force exerted by the third spring (13 ₁ ) in contact with the armature (8) is determined by the difference in spring force between the first and second springs (11 ₁ , 12 ₁ ) at that time. 5. The valve operating device for an internal combustion engine according to claim 4, wherein the valve operating device is set to be larger than the force in the valve opening direction acting on the engine.

A fixed housing (7 ₁₎ slidably mated valve-closing electromagnet in (9 _2), the resistance member to exert sliding resistance (20) is provided in contact with the housing (7 ₁₎ The valve operating apparatus for an internal combustion engine according to any one of claims 1 to 4, wherein the valve operating apparatus is provided.