JP3904641B2 - Variable valve timing device - Google Patents

Variable valve timing device Download PDF

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JP3904641B2
JP3904641B2 JP31215396A JP31215396A JP3904641B2 JP 3904641 B2 JP3904641 B2 JP 3904641B2 JP 31215396 A JP31215396 A JP 31215396A JP 31215396 A JP31215396 A JP 31215396A JP 3904641 B2 JP3904641 B2 JP 3904641B2
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electromagnetic solenoid
elastic body
cam shaft
transmission member
case
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JPH10153105A (en
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鋼治 坂根
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Nittan Valve Co Ltd
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Nittan Valve Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、内燃機関のカム軸の回転位相を変更する可変バルブタイミング装置に関する。
【０００２】
【従来の技術】
可変バルブタイミング装置は、内燃機関の吸気バルブや排気バルブを開閉するカム軸の回転位相を変更して、内燃機関の吸気バルブや排気バルブの開閉のタイミングを調節するものである。
【０００３】
可変バルブタイミング装置は、例えば、特開平４−２７２４１１号公報、特開平５−１７９９０８号公報に開示されている。
【０００４】
従来の可変バルブタイミング装置の機構は次のようなものである。
【０００５】
すなわち、カム軸上には伝動部材（プーリ、スプロケットなど）が、カム軸に対して相対回転可能に支承されている。この伝動部材は内燃機関のクランク軸の回転に連動して回転する。すなわち、クランク軸の回転、又は、ツインカムエンジンの場合は前記とは別のカム軸の回転によりベルトやチェーンなどを介して回転する。
【０００６】
カム軸の軸端部には伝達部材が止め具により固定されている。
【０００７】
伝動部材の回転は所定の機構の伝達経路を介して伝達部材、ひいてはカム軸に伝えられる。すなわち、カム軸と同軸にドラムが設けられ、このドラムと前記伝動部材との間には付勢材が介装されている。伝達部材の軸周にはピストン部材（移動部材）がヘリカル機構により噛み合っている。また、ピストン部材は伝動部材の回転中心部分に形成されている爪部材と係合していて当該伝動部材と同位相で回転する。ピストン部材の外周には雄ねじが形成され、前記ドラムの内周面には雌ねじが形成され、この両者はねじ作用により噛み合っている。
【０００８】
カム軸の回転位相を変更するためには、第１の電磁ソレノイドによりピストン部材をカム軸の軸方向に移動することにより行う。すなわち、第１の電磁ソレノイドの発生磁界によりドラムをカム軸の軸方向に吸引すると、ドラムは付勢材の弾性力に抗してピストン部材に対して相対的に回転する。このとき、ドラムとねじ作用により噛み合っているピストン部材はカム軸の軸方向に摺動する。ピストン部材と伝達部材はヘリカル機構により噛み合っており、また、ピストン部材は伝動部材と同位相で回転するものであるから、ピストン部材の前記移動により、伝動部材の回転に対して、伝達部材、ひいてはカム軸の回転位相が変わる。
【０００９】
第１の電磁ソレノイドをＯＦＦにすると、前記付勢材の弾性力によりドラムとピストン部材との相対的な位置は元に戻り、伝達部材、ひいてはカム軸と伝動部材との相対的な回転位相が元に戻る。
【００１０】
伝達部材には被吸引部材がカム軸の軸方向に摺動可能に噛み合っており、この両者は同位相で回転する。この吸引部材はドラムとギアで噛み合っているが、前記のように第１の電磁ソレノイドでドラムを吸引して回転させるときは、第２の電磁ソレノイドで被吸引部材を吸引し、同部材のドラムとの噛み合いを外して、前記のようにドラムが付勢材の付勢力に抗して回転できるようにしている。
【００１１】
前記第２の電磁ソレノイドは、前記カム軸の軸芯線を囲むように配置されている。より具体的には、カム軸の軸端部に固定されている伝達部材や、この伝達部材を固定している止め具の外周面を囲むように、これらと同軸で軸受部材を介して配置されている。第２の電磁ソレノイドの周囲はケースにより囲まれ、この第２の電磁ソレノイドはケースにボルトなどで固定されている。
【００１２】
【発明が解決しようとする課題】
しかし、上記従来の可変バルブタイミング装置では、以下のような問題があった。
【００１３】
すなわち、第２の電磁ソレノイドをケースに対してボルトなどで固定しているため、伝動部材からの荷重、カム軸からの荷重、各部材の寸法のバラツキによる荷重などは、伝達部材をカム軸に固定している止め具との間に介装されている軸受部材により吸収せざるを得ず、この軸受部材の受ける負担が過大となり、軸受部材の寿命が著しく短くなってしまうという問題である。
【００１４】
また、この場合に、軸受部材の受ける負担を軽減するため各部材の寸法のバラツキを低減しようとすると、各部材の製造コストを釣り上げてしまうという問題もある。
【００１５】
また、ボルトなどで第２の電磁ソレノイドをケースに固定しているので、ケースにはボルト孔などを形成する必要があり、そのボルト孔などに油洩れを防止するための何等かの手段を施さないと油洩れしてしまうという問題もある。
【００１６】
そこで、この発明の目的は、前記の課題を解決し、可変バルブタイミング装置における電磁ソレノイドの取付けに関して、各部材のある程度の寸法のバラツキを許容しても軸受部材の負担を低減できるようにして軸受部材の寿命を向上させ、しかも、油洩れを防止するための格別の手段を不要とすることにある。
【００１７】
また、この発明の別の目的は、さらに、上記の目的達成のために使用される弾性体の取付け作業を容易とすることにある。
【００１８】
この発明の別の目的は、カム軸のスラスト方向の荷重も、容易に吸収できるようにすることにある。
【００１９】
【課題を解決するための手段】
上記の課題を解決するための手段を、後述する発明の実施の形態における対応する部材や符号などもカッコ書きで付記して説明する。
【００２０】
(１)請求項１に記載の発明は、
内燃機関のクランク軸の回転に連動してカム軸（１１０）上で当該カム軸に対して相対回転可能に支承されている伝動部材（２）と、
前記伝動部材の回転を前記カム軸に伝える伝達経路で、前記カム軸の軸方向に移動することにより（ギア４３３とギア３２とによる）ヘリカル機構を介して前記伝動部材に対する前記カム軸の回転位相を変える移動部材（ピストン部材４３）と、
軸受部材を介して前記カム軸の軸芯線を囲んで配置され、前記移動部材の移動に関わる（具体的には被吸引部材４６を吸引する）磁界を発生する電磁ソレノイド（第２の電磁ソレノイド５ａ）と、
この電磁ソレノイドの周囲を囲むケース（８）と、
このケースと前記電磁ソレノイドとの間に介装され前記電磁ソレノイドを前記ケース内に弾性的に保持する弾性手段（弾性体７、７ａ、７ｂ、７ｃ、７ｄ、７ｆ、７ｇ）と、を備え、
前記弾性手段（弾性体７、７ｂ、７ｃ）は両端部（７１と７１、７１ｂと７１ｂ、７１ｃと７１ｃ）が切離された帯状のものである可変バルブタイミング装置（１）である。
【００２１】
請求項１に記載の可変バルブタイミング装置によれば、軸受部材を介してカム軸の軸芯線を囲んで配置された電磁ソレノイドと、その周囲を囲むケースとの間には弾性手段が介装され、電磁ソレノイドは、従来のようにケースにボルトなどで固定しなくても、弾性手段によりケース内に弾性的に保持されるから、伝動部材からの荷重、カム軸からの荷重、各部材の寸法のバラツキによる荷重などは弾性手段に吸収されるので、各部材のある程度の寸法のバラツキを許容しても、カム軸の軸芯線と電磁ソレノイドとの間の軸受部材に過度の荷重負担をかけることを防止できる。すなわち、電磁ソレノイドは軸受部材側からの荷重に合わせてある程度振れて、電磁ソレノイドの振れは弾性手段に吸収される。
【００２２】
従って、請求項１に記載の可変バルブタイミング装置によれば、可変バルブタイミング装置における電磁ソレノイドの取付けに関して、各部材のある程度の寸法のバラツキを許容しても軸受の負担を低減できるようにして軸受の寿命を向上させることができ、また、油洩れを防止するための格別の手段を必要としない。
【００２３】
なお、以上の説明からも明らかなように、この発明にいう「弾性手段」の「弾性」とは、伝動部材やカム軸からの荷重、各部材の寸法のバラツキによる荷重などによる電磁ソレノイドの振れを吸収でき、しかも、このような振れにもかかわらず電磁ソレノイドをケース内に保持できるような弾性である。
【００２５】
また、弾性手段は両端部が切離された帯状であるため、弾性体を電磁ソレノイドの周囲に巻つけるようにして両端部同士を合わせることで装着できるので、弾性手段を円環状に形成した場合に比べて、その取付け作業が容易なものとなる。
【００２６】
(２)請求項２に記載の発明は、
前記弾性手段（弾性体７、７ｂ、７ｆ）における前記電磁ソレノイド側の面には連続的な凸部（７２…、７２ｂ…、波形が形成する内周面側の凸部）が形成されている請求項１に記載の可変バルブタイミング装置である。
【００２７】
請求項２に記載の可変バルブタイミング装置によれば、弾性手段における電磁ソレノイド側の面には連続的な凸部が形成されているから、内側のカム軸側から圧力を受け、連続的な凸部により、カム軸の径方向の荷重のみならず、スラスト方向の荷重も吸収しやすくすることができる。
【００２８】
なお、前記弾性手段（弾性体７ｃ）は、この弾性体を前記電磁ソレノイドに係止する係止部材（７３ｃ……）を形成して、激しい振動を受けても弾性体が脱落しないようにしてもよい。
【００２９】
また、前記弾性手段（弾性体７ｄ）は、弾性手段（弾性体７ａ）周囲に、この弾性体が発生する圧力を分散させる緩衝部材（プロテクタ７１ｄ）を装着して、この弾性手段に傷、破損、変形などが生じないようにしてもよい。
【００３０】
【発明の実施の形態】
まず、構成について説明する。
【００３１】
図１は、この発明の実施の一形態である可変バルブタイミング装置１の断面図であり、図２は、同分解斜視図である。
【００３２】
図１、図２に示すように、可変バルブタイミング装置１は、カム軸１１０（車載用エンジンなどの内燃機関のシリンダーヘッド１２０から一端部１１１が延出している）上に回転可能に支承されるプーリ、スプロケットなどの（図１、図２の例ではプーリ）伝動部材２が設けられている。
【００３３】
この伝動部材２はカム軸１１０上に、カム軸１１０に対して相対回転可能に支承され、内燃機関のクランク軸の回転に連動して回転する。すなわち、クランク軸の回転、又は、ツインカムエンジンの場合は前記とは別のカム軸の回転により、ベルトやチェーンなどを介して回転する（何れも図示省略）。
【００３４】
カム軸１１０の軸端部１１１には、伝達部材３が止め具３１によりねじ止め固定されている。
【００３５】
伝動部材２の回転は所定の機構の伝達経路を介して伝達部材３に伝えられる。
【００３６】
すなわち、カム軸１１０と同軸にドラム４１が設けられ、このドラム４１と伝達部材３との間には付勢材（この例ではコイルばね）４２が介装されている。すなわち、伝達部材３にはケース部材４４が固定され、付勢材４２の外周側端部４２１は、このケース部材４４の内周面部分に固定され、付勢材４２の内周側端部４２２は、ドラム４１の外周面に固定されている。
【００３７】
伝動部材３の軸周にはピストン部材４３（この発明の「移動部材」に相当する）が、ヘリカル機構により噛み合っている。すなわち、いずれもはすに形成されている、伝動部材３の軸周に形成されたギア３２と、ピストン部材４３の内周に形成されたギア４３３とにより、噛み合っている。ピストン部材４３の両側からは係合部材４３１、４３１が延出していて、伝動部材２の回転中心部分からカム軸１１０の軸方向に延出している爪部材２１、２１の間に係合している。この係合によりピストン部材４３と伝動部材２とは同位相で回転する。ピストン部材４３の係合部材４３１、４３１には雄ねじ４３２が各々形成され、ドラム４１の内周面には雌ねじ４１１が形成されていて、この両者はねじ作用により噛み合っている。
【００３８】
ドラム軸受部材４５は伝達部材３の外周とドラム４１の内周との間に介装され、この両者の相対回転を軸受する。被吸引部材４６は、その回転中心部分に雌ねじ４６１が形成され、この雄ねじ４６１は伝動部材３の先端部に形成されている雄ねじ３３に噛み合っている。これにより、被吸引部材４６は伝達部材３に対し、その軸方向に摺動可能である。また、ねじ３３と４６１との噛み合いにより、被吸引部材４６と伝達部材３とは同位相で回転する。ドラム４１のフランジ部分４１２の側面にはギア４１３が形成され、被吸引部材４６の一方の面４６２に形成されているギア４６３と対峙していて、この両ギアは噛み合うことができる。
【００３９】
第１の電磁ソレノイド５ｂと第２の電磁ソレノイド５ｂは、カム軸１１０の軸芯線を囲むように配置されている。より具体的には、カム軸１１０の軸端部１１１に固定されている伝達部材３や、この伝達部材を固定している止め具３１の外周面を囲むように軸受部材６を介して配置されている。すなわち、スペーサ部材４７が、止め具３１の頭部３１１と伝達部材３の先端部との間に嵌合固定されていて、このスペーサ部材４７の外周側には、第２の電磁ソレノイド５ａがスペーサ部材４７との間に軸受部材６を介して配置されている。さらに第２の電磁ソレノイド５ａと被吸引部材４６の外周側には第１の電磁ソレノイド５ｂが配置されている。
【００４０】
第２の電磁ソレノイド５ａの周囲はケース８により囲まれ、このケース８と電磁ソレノイド５ａとの間には、この発明の特徴をなす弾性体７が介装されている。この弾性体７により、電磁ソレノイド５ａはケース８内に弾性的に保持されている。
【００４１】
弾性体７は、例えば、図３に示すような構成である。
【００４２】
すなわち、弾性体７は、両端部７１、７１が切離された帯状であり、円環状に形成されている。また、この弾性体７は内周側の面に連続的な凸形状部７２……を形成している。
【００４３】
次に、作用について説明する。
【００４４】
カム軸１１０の回転位相を変更するためには、第１の電磁ソレノイド５ｂが発生する磁界によりピストン部材４３をカム軸１１０の軸方向に移動することにより行う。すなわち、まず、第２の電磁ソレノイド５ａの発生磁界により、被吸引部材４６が吸引されて、被吸引部材４６のギア４６３と、ドラム４１のギア４１３とが離れ、ドラム４１が伝動部材２に対して相対的に回転できるようになる。そして、第１の電磁ソレノイド５ｂの発生磁界により、ドラム４１を吸引する。これによりドラム４１は付勢材４２の弾性力に抗して伝動部材２に対して相対回転し、ねじ４１１とねじ４３２とで噛み合っているピストン部材４３はカム軸１１０の軸方向に移動する。ピストン部材４３と伝達部材３とは前記のヘリカル機構により噛み合っているので、ピストン部材４３の移動により、伝達部材３、ひいてはカム軸１１０の回転位相が伝動部材２に対して変わることとなる。
【００４５】
なお、電磁ソレノイド５ｂをＯＦＦにすると、付勢材４２の弾性力により伝達部材３は元の位置に戻り、カム軸１１０と伝動部材２との相対的な回転位相も元に戻る。
【００４６】
軸受部材６を介してカム軸１１０と同軸に配置された第２の電磁ソレノイド５ａと、その周囲を囲むケース８との間には弾性体７が介装されている。そのため、第２の電磁ソレノイド５ａは、従来のようにケース８にボルトなどで固定しなくても、弾性体７によりケース８内に弾性的に保持されるから、伝動部材２からの荷重、カム軸１１０からの荷重、各部材の寸法のバラツキによる荷重などは弾性体７に吸収されるので、各部材のある程度の寸法のバラツキを許容しても、カム軸１１０と第２の電磁ソレノイド５ａとの間の軸受部材６に過度の荷重負担をかけることを防止できる。すなわち、第２の電磁ソレノイド５ａは軸受部材６側からの荷重に合わせてある程度振れ、この第２の電磁ソレノイド５ａの振れは弾性体７に吸収される。
【００４７】
従って、可変バルブタイミング装置１における第２の電磁ソレノイド５ａの取付けに関して、各部材のある程度の寸法のバラツキを許容しても軸受部材６の負担を低減できるようにして軸受部材６の寿命を向上させることができる。
【００４８】
また、第２の電磁ソレノイド５ａのボルトなどの固定を不要とするので、油洩れを防止するための格別の手段を不要にできる。
【００４９】
さらに、各部材の寸法バラツキによる芯ずれ、偏重心の緩和や、第２の電磁ソレノイド５ａと被吸引部材４６とのクリアランスばらつきを軽減することもできる。
【００５０】
弾性体７は両端部７１、７１が切離された帯状であるため（図３参照）、向き合った両端部７１、７１を開いて、弾性体７を第２の電磁ソレノイド５ａの周囲に巻つけるようにして両端部７１、７１同士を合わせることで装着できるので、弾性体７を円環状に形成した場合に比べて、その取付け作業が容易なものとなる。
【００５１】
さらに、弾性体７における第２の電磁ソレノイド５ａ側の面（内周面）には連続的な凸部７２……が形成されているから、カム軸１１０側から圧力を受け、凸部７２……により、カム軸１１０の径方向の荷重のみならず、スラスト方向の荷重も吸収しやすくすることができる。
【００５２】
なお、前記発明の実施の形態は、いうまでもなく、この発明を限定するものではない。例えば、弾性体７は図３に示したもの以外に種々のものを用いることができる。以下では、弾性体７の他の例についていくつか説明する。
【００５３】
図４に示す弾性体７ａは、連続的な円環状の帯状体としたものであり、連続的な凸部７２ａ……を外周面に形成したので、ケース８側から圧力を受ける。
【００５４】
図５に示す弾性体７ｂは、図３に示す弾性体７と異なり、円環状には形成されておらず、平板的な帯状体に形成されている。装着のときは、両端部７１ｂ、７１ｂを合わせるようにして、ケース８の内周面に装着する。内周側となる面に連続的な凸部７２ｂ……を形成したので、前記弾性体７と同様、カム軸１１０側から圧力を受ける。
【００５５】
図６に示す弾性体７ｃは、両端部７１ｃ、７１ｃが切断された円環状の帯状体であり、連続的な凸部７２ｃ……が外周面に形成されている。また、一方の側縁部には、抜け止め７３ｃ……が所定間隔で形成されている。ケース８に、この弾性体７ｃを装着し、その後、第２の電磁ソレノイド５ａをケース８に装着することで、抜け止め７３ｃ……が第２の電磁ソレノイド５ａに係合した状態となる。これにより、激しい振動が発生したような場合でも、弾性体７ｃはケース８と第２の電磁ソレノイド５ａとの間から離脱しにくくすることができる。
【００５６】
図７に示す弾性体７ｄは、図４に示す弾性体７ａの外周部分に両端が切断された円環状のプロテクタ７１ｄを装着したもので、弾性体７ａに発生する弾性的な圧力をプロテクタ７１ｄで分散し、弾性体７ａの傷つき、破損、変形を防止したものである。
【００５７】
図８に示す弾性体７ｅは、連続的な円環状の帯状体とした点は、図４に示す弾性体７ａと同様であるが、連続的な凸部７２ｅ……を外周面に２列に形成したもので、弾性体７ａに比べて弾性的な圧力を倍増することができる。
【００５８】
図９に示す弾性体７ｆは、連続的な円環状の帯状体で、この帯状体を連続的な波形形状にしたもので、帯状体の内周面にも外周面にも連続的な凸部が形成されるようにしたものである。これにより、弾性体７ｆは外周面側（ケース８側）からの圧力も、内周面側（カム軸１１０側）からの圧力も受けることができる。
【００５９】
なお、図３〜図９に示す弾性体は、例えば、ＳＵＳ３０４、ＳＵＳ３１６、ＳＵＳ６３１、ＳＫ材、Ｓ８０Ｃ、ハステロイなどを材料とすることができる。
【００６０】
図１０に示す弾性体７ｇは、ゴム系材料（ＮＢＲ、テフロン、フッ素ゴム、シリコーンゴム、ウレタンゴム）や樹脂で製造された連続的な円環状の部材であり、前記弾性体のような連続的な凸部は形成されていない。この弾性体７ｇはケース８と電磁ソレノイド７ａとの間に圧入され、ゴム系材料や樹脂の弾性力により圧力を吸収する。
【００６１】
図１１に示す弾性体７ｈは、電磁ソレノイド７ａの全周にあたって複数個介装されたコイルばねであり、このコイルばねの弾性力により圧力を吸収するものである。
【００６２】
【発明の効果】
請求項１に記載の発明によれば、可変バルブタイミング装置における電磁ソレノイドの取付けに関して、各部材のある程度の寸法のバラツキを許容しても軸受の負担を低減できるようにして軸受の寿命を向上させることができる。
【００６３】
また、油洩れを防止するための格別の手段を必要としない。
【００６４】
さらに、各部材の寸法バラツキによる芯ずれ、偏重心の緩和や、電磁ソレノイドと被吸引部材とのクリアランスばらつきの軽減も可能となる。
【００６５】
また、このほか、上記の目的達成のために使用される弾性手段の取付け作業を容易とすることができる。
【００６６】
請求項２に記載の発明によれば、請求項１に記載の発明と同様の効果を奏するほか、カム軸のスラスト方向の荷重も容易に吸収できる。
【図面の簡単な説明】
【図１】この発明の実施の一形態である可変バルブタイミング装置の断面図。
【図２】この発明の実施の一形態である可変バルブタイミング装置の斜視図。
【図３】この発明の実施の一形態である可変バルブタイミング装置の弾性体を示す斜視図。
【図４】前記弾性体の他の例を示す図。
【図５】前記弾性体の他の例を示す図。
【図６】前記弾性体の他の例を示す図。
【図７】前記弾性体の他の例を示す図。
【図８】前記弾性体の他の例を示す図。
【図９】前記弾性体の他の例を示す図。
【図１０】前記弾性体の他の例を示す図。
【図１１】前記弾性体の他の例を示す図。
【符号の説明】
１ 可変バルブタイミング装置
２ 伝動部材
３ 伝達部材
４３ ピストン部材（移動部材）
５ａ 第２の電磁ソレノイド
７、７ａ、７ｂ、７ｃ、７ｄ、７ｆ、７ｇ 弾性体
７１、７１ｂ、７１ｃ 弾性体の切断された端部
７２、７２ｂ 弾性体の凸部
８ ケース
１１０ カム軸[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a variable valve timing device that changes the rotational phase of a camshaft of an internal combustion engine.
[0002]
[Prior art]
The variable valve timing device adjusts the opening / closing timing of the intake valve and exhaust valve of the internal combustion engine by changing the rotational phase of the camshaft that opens and closes the intake valve and exhaust valve of the internal combustion engine.
[0003]
Variable valve timing devices are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 4-272411 and 5-179908.
[0004]
The mechanism of the conventional variable valve timing device is as follows.
[0005]
That is, a transmission member (pulley, sprocket, etc.) is supported on the cam shaft so as to be rotatable relative to the cam shaft. This transmission member rotates in conjunction with the rotation of the crankshaft of the internal combustion engine. That is, it rotates via a belt, a chain, etc. by rotation of a crankshaft or rotation of a camshaft different from the above in the case of a twin cam engine.
[0006]
A transmission member is fixed to the shaft end portion of the cam shaft by a stopper.
[0007]
The rotation of the transmission member is transmitted to the transmission member and eventually to the camshaft through a transmission path of a predetermined mechanism. That is, a drum is provided coaxially with the cam shaft, and a biasing member is interposed between the drum and the transmission member. A piston member (moving member) meshes with the circumference of the transmission member by a helical mechanism. Further, the piston member is engaged with a claw member formed at the center of rotation of the transmission member, and rotates in the same phase as the transmission member. A male screw is formed on the outer periphery of the piston member, and a female screw is formed on the inner peripheral surface of the drum. The two are engaged by a screw action.
[0008]
In order to change the rotational phase of the cam shaft, the first electromagnetic solenoid moves the piston member in the axial direction of the cam shaft. That is, when the drum is attracted in the axial direction of the cam shaft by the magnetic field generated by the first electromagnetic solenoid, the drum rotates relative to the piston member against the elastic force of the biasing member. At this time, the piston member engaged with the drum by the screw action slides in the axial direction of the cam shaft. The piston member and the transmission member are meshed with each other by a helical mechanism, and the piston member rotates in the same phase as the transmission member. Therefore, the movement of the piston member causes the transmission member, and consequently the rotation, of the transmission member to rotate. The rotational phase of the camshaft changes.
[0009]
When the first electromagnetic solenoid is turned OFF, the relative position between the drum and the piston member is restored to the original by the elastic force of the biasing member, and the relative rotational phase between the transmission member, and hence the cam shaft and the transmission member, is changed. Return to the original.
[0010]
A member to be sucked is engaged with the transmission member so as to be slidable in the axial direction of the cam shaft, and both rotate in the same phase. The suction member meshes with the drum and the gear. As described above, when the drum is sucked and rotated by the first electromagnetic solenoid, the member to be sucked is sucked by the second electromagnetic solenoid, and the drum of the same member is used. And the drum can be rotated against the urging force of the urging member as described above.
[0011]
The second electromagnetic solenoid is disposed so as to surround the axis of the cam shaft. More specifically, the transmission member fixed to the shaft end of the camshaft and the outer peripheral surface of the stopper fixing the transmission member are arranged coaxially with these via a bearing member. ing. The periphery of the second electromagnetic solenoid is surrounded by a case, and the second electromagnetic solenoid is fixed to the case with a bolt or the like.
[0012]
[Problems to be solved by the invention]
However, the conventional variable valve timing device has the following problems.
[0013]
That is, since the second electromagnetic solenoid is fixed to the case with a bolt or the like, the load from the transmission member, the load from the cam shaft, the load due to the dimensional variation of each member, etc. This is a problem that the bearing member that is interposed between the fixing member and the fixed stopper must be absorbed, and the load received by the bearing member becomes excessive, and the life of the bearing member is remarkably shortened.
[0014]
Further, in this case, if it is attempted to reduce the dimensional variation of each member in order to reduce the burden received by the bearing member, there is a problem that the manufacturing cost of each member is increased.
[0015]
In addition, since the second electromagnetic solenoid is fixed to the case with a bolt or the like, it is necessary to form a bolt hole or the like in the case, and any means for preventing oil leakage is applied to the bolt hole or the like. Otherwise there will be a problem of oil leaking.
[0016]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to reduce the burden on the bearing member even if a certain degree of dimensional variation of each member is allowed with respect to the mounting of the electromagnetic solenoid in the variable valve timing device. The object is to improve the life of the member and eliminate the need for special means for preventing oil leakage.
[0017]
Another object of the present invention is to further facilitate an attaching operation of an elastic body used for achieving the above object.
[0018]
Another object of the present invention is to easily absorb the load in the thrust direction of the camshaft.
[0019]
[Means for Solving the Problems]
Means for solving the above-described problems will be described with the corresponding members and reference numerals in the embodiments of the invention to be described later being added in parentheses.
[0020]
(1) The invention described in claim 1
A transmission member (2) supported on the camshaft (110) so as to be rotatable relative to the camshaft in conjunction with the rotation of the crankshaft of the internal combustion engine;
The rotational phase of the cam shaft with respect to the transmission member via a helical mechanism (by the gear 433 and the gear 32) by moving in the axial direction of the cam shaft in a transmission path for transmitting the rotation of the transmission member to the cam shaft. A moving member (piston member 43) for changing
An electromagnetic solenoid (second electromagnetic solenoid 5a) that surrounds the shaft core of the cam shaft via a bearing member and generates a magnetic field related to the movement of the moving member (specifically, attracts the member to be attracted 46). )When,
A case (8) surrounding the electromagnetic solenoid,
Elastic means (elastic bodies 7, 7a, 7b, 7c, 7d, 7f, 7g) interposed between the case and the electromagnetic solenoid and elastically holding the electromagnetic solenoid in the case ;
The elastic means (elastic bodies 7, 7 b, 7 c) is a variable valve timing device (1) that is in the form of a strip with both end portions (71 and 71, 71 b and 71 b, 71 c and 71 c) separated .
[0021]
According to the variable valve timing device of the first aspect, the elastic means is interposed between the electromagnetic solenoid disposed so as to surround the shaft core line of the cam shaft via the bearing member and the case surrounding the solenoid. Even if the electromagnetic solenoid is not fixed to the case with bolts or the like as in the prior art, the electromagnetic solenoid is elastically held in the case by the elastic means, so the load from the transmission member, the load from the cam shaft, the dimensions of each member Since the load due to the variation in the pressure is absorbed by the elastic means, an excessive load is applied to the bearing member between the shaft core wire of the camshaft and the electromagnetic solenoid even if the variation in the size of each member is allowed. Can be prevented. That is, the electromagnetic solenoid swings to some extent in accordance with the load from the bearing member side, and the vibration of the electromagnetic solenoid is absorbed by the elastic means.
[0022]
Therefore, according to the variable valve timing device of the first aspect of the present invention, it is possible to reduce the load on the bearing by allowing the electromagnetic solenoid to be mounted in the variable valve timing device even if the variation of each member is allowed to some extent. The service life of the oil can be improved, and no special means for preventing oil leakage is required.
[0023]
As is apparent from the above description, the “elasticity” of the “elastic means” in the present invention means the vibration of the electromagnetic solenoid due to the load from the transmission member and the cam shaft, the load due to the variation in the dimensions of each member, etc. Further, it is elastic so that the electromagnetic solenoid can be held in the case in spite of such vibration.
[0025]
Also , since the elastic means has a strip shape with both ends separated, it can be attached by aligning both ends so that the elastic body is wrapped around the electromagnetic solenoid, so the elastic means is formed in an annular shape Compared to the above, the mounting work becomes easy.
[0026]
( 2 ) The invention described in claim 2
On the surface on the electromagnetic solenoid side of the elastic means (elastic bodies 7, 7 b, 7 f), continuous convex portions (72, 72 b, convex portions on the inner peripheral surface side where the waveform forms) are formed. A variable valve timing device according to claim 1 .
[0027]
According to the variable valve timing device of the second aspect, since the continuous convex portion is formed on the electromagnetic solenoid side surface of the elastic means, the continuous convex portion receives pressure from the inner camshaft side. The portion can easily absorb not only the radial load of the camshaft but also the thrust load.
[0028]
The elastic means (elastic body 7c) is formed with a locking member (73c...) For locking the elastic body to the electromagnetic solenoid so that the elastic body does not fall off even when subjected to severe vibration. Also good.
[0029]
The elastic means (elastic body 7d) is provided with a buffer member (protector 71d) that disperses the pressure generated by the elastic body around the elastic means (elastic body 7a). , Deformation or the like may not occur.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
First, the configuration will be described.
[0031]
FIG. 1 is a sectional view of a variable valve timing device 1 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.
[0032]
As shown in FIGS. 1 and 2, the variable valve timing device 1 is rotatably supported on a camshaft 110 (one end 111 extends from a cylinder head 120 of an internal combustion engine such as an in-vehicle engine). Transmission members 2 such as pulleys and sprockets (pulleys in the examples of FIGS. 1 and 2) are provided.
[0033]
The transmission member 2 is supported on the camshaft 110 so as to be rotatable relative to the camshaft 110, and rotates in conjunction with the rotation of the crankshaft of the internal combustion engine. That is, it rotates via a belt, a chain, etc. by rotation of a crankshaft or a camshaft different from the above in the case of a twin cam engine (all are not shown).
[0034]
The transmission member 3 is fixed to the shaft end portion 111 of the cam shaft 110 with a stopper 31 by screws.
[0035]
The rotation of the transmission member 2 is transmitted to the transmission member 3 through a transmission path of a predetermined mechanism.
[0036]
That is, a drum 41 is provided coaxially with the camshaft 110, and a biasing member (in this example, a coil spring) 42 is interposed between the drum 41 and the transmission member 3. That is, the case member 44 is fixed to the transmission member 3, and the outer peripheral side end 421 of the biasing member 42 is fixed to the inner peripheral surface portion of the case member 44, and the inner peripheral side end 422 of the biasing member 42. Is fixed to the outer peripheral surface of the drum 41.
[0037]
A piston member 43 (corresponding to the “moving member” of the present invention) is engaged with the shaft circumference of the transmission member 3 by a helical mechanism. That is, the gear 32 formed on the shaft periphery of the transmission member 3 and the gear 433 formed on the inner periphery of the piston member 43 are meshed with each other. Engaging members 431 and 431 extend from both sides of the piston member 43 and engage between the claw members 21 and 21 extending in the axial direction of the camshaft 110 from the rotation center portion of the transmission member 2. Yes. By this engagement, the piston member 43 and the transmission member 2 rotate in the same phase. The engagement members 431 and 431 of the piston member 43 are each formed with a male screw 432, and the drum 41 is formed with a female screw 411, which are engaged by a screw action.
[0038]
The drum bearing member 45 is interposed between the outer periphery of the transmission member 3 and the inner periphery of the drum 41, and supports the relative rotation between the two. The sucked member 46 is formed with a female screw 461 at the center of rotation thereof, and the male screw 461 is engaged with a male screw 33 formed at the tip of the transmission member 3. Thereby, the sucked member 46 can slide in the axial direction with respect to the transmission member 3. Further, due to the engagement of the screws 33 and 461, the sucked member 46 and the transmission member 3 rotate in the same phase. A gear 413 is formed on a side surface of the flange portion 412 of the drum 41 and is opposed to a gear 463 formed on one surface 462 of the sucked member 46, and both the gears can be engaged with each other.
[0039]
The first electromagnetic solenoid 5 b and the second electromagnetic solenoid 5 b are arranged so as to surround the axis line of the cam shaft 110. More specifically, it is arranged via the bearing member 6 so as to surround the outer peripheral surface of the transmission member 3 fixed to the shaft end 111 of the cam shaft 110 and the stopper 31 fixing the transmission member. ing. That is, the spacer member 47 is fitted and fixed between the head portion 311 of the stopper 31 and the distal end portion of the transmission member 3, and on the outer peripheral side of the spacer member 47, the second electromagnetic solenoid 5 a is a spacer. The bearing member 6 is disposed between the member 47 and the member 47. Further, the first electromagnetic solenoid 5 b is arranged on the outer peripheral side of the second electromagnetic solenoid 5 a and the attracted member 46.
[0040]
The periphery of the second electromagnetic solenoid 5a is surrounded by a case 8, and an elastic body 7 that characterizes the present invention is interposed between the case 8 and the electromagnetic solenoid 5a. The electromagnetic solenoid 5 a is elastically held in the case 8 by the elastic body 7.
[0041]
The elastic body 7 is configured as shown in FIG. 3, for example.
[0042]
That is, the elastic body 7 has a band shape in which both end portions 71 and 71 are separated from each other, and is formed in an annular shape. In addition, the elastic body 7 has continuous convex portions 72... Formed on the inner peripheral surface.
[0043]
Next, the operation will be described.
[0044]
In order to change the rotational phase of the cam shaft 110, the piston member 43 is moved in the axial direction of the cam shaft 110 by the magnetic field generated by the first electromagnetic solenoid 5b. That is, first, the attracted member 46 is attracted by the magnetic field generated by the second electromagnetic solenoid 5a, the gear 463 of the attracted member 46 and the gear 413 of the drum 41 are separated, and the drum 41 is separated from the transmission member 2. Can be rotated relatively. Then, the drum 41 is attracted by the magnetic field generated by the first electromagnetic solenoid 5b. As a result, the drum 41 rotates relative to the transmission member 2 against the elastic force of the biasing member 42, and the piston member 43 engaged with the screw 411 and the screw 432 moves in the axial direction of the cam shaft 110. Since the piston member 43 and the transmission member 3 are meshed with each other by the helical mechanism, the rotational phase of the transmission member 3 and thus the cam shaft 110 changes with respect to the transmission member 2 by the movement of the piston member 43.
[0045]
When the electromagnetic solenoid 5b is turned off, the transmission member 3 returns to the original position by the elastic force of the biasing member 42, and the relative rotational phase between the cam shaft 110 and the transmission member 2 also returns to the original position.
[0046]
An elastic body 7 is interposed between the second electromagnetic solenoid 5a disposed coaxially with the camshaft 110 via the bearing member 6 and the case 8 surrounding the periphery thereof. Therefore, the second electromagnetic solenoid 5a is elastically held in the case 8 by the elastic body 7 without being fixed to the case 8 with a bolt or the like as in the prior art, so that the load from the transmission member 2, cam Since the load from the shaft 110 and the load due to the variation in the size of each member are absorbed by the elastic body 7, even if the variation in the size of each member is allowed to some extent, the cam shaft 110 and the second electromagnetic solenoid 5a It is possible to prevent an excessive load from being applied to the bearing member 6 between the two. That is, the second electromagnetic solenoid 5a swings to some extent according to the load from the bearing member 6 side, and the swing of the second electromagnetic solenoid 5a is absorbed by the elastic body 7.
[0047]
Therefore, regarding the mounting of the second electromagnetic solenoid 5a in the variable valve timing device 1, the life of the bearing member 6 can be improved by reducing the burden on the bearing member 6 even if a variation in the size of each member is allowed. be able to.
[0048]
Further, since it is not necessary to fix the bolts of the second electromagnetic solenoid 5a, special means for preventing oil leakage can be eliminated.
[0049]
Furthermore, misalignment due to dimensional variation of each member, relaxation of the eccentric center of gravity, and clearance variation between the second electromagnetic solenoid 5a and the attracted member 46 can be reduced.
[0050]
Since the elastic body 7 has a strip shape in which both end portions 71 and 71 are separated (see FIG. 3), the opposite end portions 71 and 71 are opened and the elastic body 7 is wound around the second electromagnetic solenoid 5a. Thus, since it can mount | wear by match | combining both ends 71 and 71, compared with the case where the elastic body 7 is formed in the annular | circular shape, the attachment operation | work becomes easy.
[0051]
Further, since a continuous convex portion 72... Is formed on the surface (inner peripheral surface) of the elastic body 7 on the second electromagnetic solenoid 5 a side, pressure is received from the cam shaft 110 side, and the convex portion 72. As a result, not only the radial load of the camshaft 110 but also the thrust load can be easily absorbed.
[0052]
Needless to say, the embodiments of the invention do not limit the invention. For example, various elastic bodies 7 other than those shown in FIG. 3 can be used. Hereinafter, some other examples of the elastic body 7 will be described.
[0053]
The elastic body 7a shown in FIG. 4 is a continuous annular belt-like body, and has continuous convex portions 72a formed on the outer peripheral surface, and therefore receives pressure from the case 8 side.
[0054]
Unlike the elastic body 7 shown in FIG. 3, the elastic body 7b shown in FIG. 5 is not formed in an annular shape, but is formed in a flat belt-like body. At the time of mounting, the both ends 71b and 71b are aligned and mounted on the inner peripheral surface of the case 8. Since the continuous convex portions 72b... Are formed on the inner peripheral surface, the pressure is received from the camshaft 110 side in the same manner as the elastic body 7.
[0055]
The elastic body 7c shown in FIG. 6 is an annular belt-like body with both end portions 71c and 71c cut, and continuous convex portions 72c are formed on the outer peripheral surface. Further, retaining stoppers 73c are formed at predetermined intervals on one side edge portion. The elastic body 7c is attached to the case 8, and then the second electromagnetic solenoid 5a is attached to the case 8, so that the retainer 73c is engaged with the second electromagnetic solenoid 5a. Thereby, even when intense vibration occurs, the elastic body 7c can be made difficult to separate from between the case 8 and the second electromagnetic solenoid 5a.
[0056]
An elastic body 7d shown in FIG. 7 is obtained by attaching an annular protector 71d having both ends cut to the outer peripheral portion of the elastic body 7a shown in FIG. 4, and the protector 71d applies elastic pressure generated on the elastic body 7a. It is dispersed to prevent the elastic body 7a from being damaged, broken or deformed.
[0057]
The elastic body 7e shown in FIG. 8 is the same as the elastic body 7a shown in FIG. 4 in that it is a continuous annular belt-like body, but the continuous convex portions 72e are arranged in two rows on the outer peripheral surface. The elastic pressure can be doubled compared to the elastic body 7a.
[0058]
An elastic body 7f shown in FIG. 9 is a continuous annular belt-like body, and the belt-like body is formed into a continuous corrugated shape. Convex portions that are continuous on both the inner and outer peripheral surfaces of the belt-like body. Is formed. Thereby, the elastic body 7f can receive the pressure from the outer peripheral surface side (case 8 side) and the pressure from the inner peripheral surface side (cam shaft 110 side).
[0059]
3 to 9 can be made of, for example, SUS304, SUS316, SUS631, SK material, S80C, Hastelloy, or the like.
[0060]
The elastic body 7g shown in FIG. 10 is a continuous annular member made of a rubber-based material (NBR, Teflon, fluoro rubber, silicone rubber, urethane rubber) or a resin, and is continuous like the elastic body. No convex part is formed. The elastic body 7g is press-fitted between the case 8 and the electromagnetic solenoid 7a, and absorbs pressure by the elastic force of a rubber-based material or resin.
[0061]
The elastic body 7h shown in FIG. 11 is a coil spring interposed around the entire circumference of the electromagnetic solenoid 7a, and absorbs pressure by the elastic force of the coil spring.
[0062]
【The invention's effect】
According to the first aspect of the present invention, with respect to the mounting of the electromagnetic solenoid in the variable valve timing device, the bearing life can be improved by reducing the burden on the bearing even if a variation in the size of each member is allowed. be able to.
[0063]
Further, no special means for preventing oil leakage is required.
[0064]
Furthermore, misalignment due to dimensional variation of each member, relaxation of the eccentric center of gravity, and clearance variations between the electromagnetic solenoid and the attracted member can be reduced.
[0065]
In addition, the attaching operation of the elastic means used for achieving the above object can be facilitated.
[0066]
According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the thrust load of the camshaft can be easily absorbed.
[Brief description of the drawings]
FIG. 1 is a sectional view of a variable valve timing device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a variable valve timing device according to an embodiment of the present invention.
FIG. 3 is a perspective view showing an elastic body of a variable valve timing device according to an embodiment of the present invention.
FIG. 4 is a view showing another example of the elastic body.
FIG. 5 is a view showing another example of the elastic body.
FIG. 6 is a view showing another example of the elastic body.
FIG. 7 is a view showing another example of the elastic body.
FIG. 8 is a view showing another example of the elastic body.
FIG. 9 is a view showing another example of the elastic body.
FIG. 10 is a view showing another example of the elastic body.
FIG. 11 is a view showing another example of the elastic body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Variable valve timing apparatus 2 Transmission member 3 Transmission member 43 Piston member (moving member)
5a Second electromagnetic solenoid 7, 7a, 7b, 7c, 7d, 7f, 7g Elastic body 71, 71b, 71c Elastic body cut end 72, 72b Elastic body convex portion 8 Case 110 Cam shaft

Claims (2)

内燃機関のクランク軸の回転に連動してカム軸上で当該カム軸に対して相対回転可能に支承されている伝動部材と、
前記伝動部材の回転を前記カム軸に伝える伝達経路で、前記カム軸の軸方向に移動することによりヘリカル機構を介して前記伝動部材に対する前記カム軸の回転位相を変える移動部材と、
軸受部材を介して前記カム軸の軸芯線を囲んで配置され、前記移動部材の移動に関わる磁界を発生する電磁ソレノイドと、
この電磁ソレノイドの周囲を囲むケースと、
このケースと前記電磁ソレノイドとの間に介装され前記電磁ソレノイドを前記ケース内に弾性的に保持する弾性手段と、を備え、
前記弾性手段は両端部が切離された帯状のものである可変バルブタイミング装置。A transmission member supported on the camshaft so as to be rotatable relative to the camshaft in conjunction with the rotation of the crankshaft of the internal combustion engine;
A moving member that changes the rotational phase of the cam shaft relative to the transmission member via a helical mechanism by moving in the axial direction of the cam shaft in a transmission path that transmits the rotation of the transmission member to the cam shaft;
An electromagnetic solenoid disposed around a shaft core line of the cam shaft via a bearing member, and generating a magnetic field related to the movement of the moving member;
A case surrounding the electromagnetic solenoid,
And an elastic means for elastically held is interposed the electromagnetic solenoid within the case between the case and the electromagnetic solenoid,
The variable valve timing device, wherein the elastic means is in a strip shape with both ends separated . 前記弾性手段における前記電磁ソレノイド側の面には連続的な凸部が形成されている請求項１に記載の可変バルブタイミング装置。The variable valve timing device according to claim 1 , wherein a continuous convex portion is formed on a surface of the elastic means on the electromagnetic solenoid side.
JP31215396A 1996-11-22 1996-11-22 Variable valve timing device Expired - Lifetime JP3904641B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31215396A JP3904641B2 (en) 1996-11-22 1996-11-22 Variable valve timing device

Publications (2)

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JP3904641B2 true JP3904641B2 (en) 2007-04-11

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Publication number Priority date Publication date Assignee Title
JP3911982B2 (en) 2000-09-25 2007-05-09 日産自動車株式会社 Variable valve timing device for internal combustion engine
JP3873663B2 (en) 2001-05-31 2007-01-24 日産自動車株式会社 Control device for variable valve timing device
EP2559868B1 (en) * 2008-02-27 2014-05-14 Nittan Valve Co., Ltd. Engine valve controller
DE102009026626A1 (en) * 2009-06-02 2010-12-09 Zf Friedrichshafen Ag Clutch or brake in or on a gearbox
US10072537B2 (en) 2015-07-23 2018-09-11 Husco Automotive Holdings Llc Mechanical cam phasing system and methods
CN114215622B (en) * 2017-01-20 2023-07-14 胡斯可汽车控股有限公司 Cam phasing system
US10900387B2 (en) 2018-12-07 2021-01-26 Husco Automotive Holdings Llc Mechanical cam phasing systems and methods

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