JP3738601B2 - Method for assembling inner diameter reference part and assembly positioning device - Google Patents

Method for assembling inner diameter reference part and assembly positioning device Download PDF

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Publication number
JP3738601B2
JP3738601B2 JP11593899A JP11593899A JP3738601B2 JP 3738601 B2 JP3738601 B2 JP 3738601B2 JP 11593899 A JP11593899 A JP 11593899A JP 11593899 A JP11593899 A JP 11593899A JP 3738601 B2 JP3738601 B2 JP 3738601B2
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Prior art keywords
inner diameter
housing
reference component
diameter reference
component
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JP11593899A
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JP2000308928A (en
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欣哉 尾藤
信英 宮内
信平 阿部
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Toyota Motor Corp
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Toyota Motor Corp
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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
    • F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34453—Locking means between driving and driven members
    • F01L2001/34469—Lock movement parallel to camshaft axis
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Machine Tool Positioning Apparatuses (AREA)
  • Automatic Assembly (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】
本発明は、内径基準部品の組み立て方法及び組立位置決め装置、特に、精密加工が内面のみ行われ、外面は粗加工された内径基準部品同士の位置決めを行い組み立てる内径基準部品の組み立て方法及び組立位置決め装置に関する。
【０００２】
【従来の技術】
従来から加工された部品同士を組み合わせて組立体を形成する場合、両者の位置合わせを行う必要がある。特に組み合わせた複数の部品によって一つの高精度加工面を形成する場合やさらに他の部品と組み合わせる場合には、組立時の位置決め精度は重要になる。この位置決め精度が低下すると、滑らかな動作や気密を維持するために精密加工を行ったにも関わらず動作不良を起こしたり、組付け不良を起こしたりする。
【０００３】
組み立て時の位置決め精度が要求される組立部品の一例として、例えば特開平９−３０３１１９号公報に示されるような内燃機関の運転中に当該内燃機関の気筒に設けられた吸気・排気バルブの開閉タイミングを可変調整するベーン式バルブタイミング制御装置の中間組立体（以下、単にＶＶＴアッセンブリという）がある。図５、図６の概念図に示すように、前記ＶＶＴアッセンブリ１００は、一般に、クランクシャフトからの動力が伝達されるスプロケット１０２と一体に連結されたハウジング１０４と、このハウジング１０４内に当該ハウジング１０４と同一回転中心を有して回転自在に収容され、バルブを開閉駆動するカムの配設されるカムシャフト１０６の一端に一体に連結されたベーン体１０８と、前記ハウジング１０４を挟んで前記スプロケット１０２の対向面に固定されるカバー１１０等によって構成されている。前記ハウジング１０４には、複数の凹部１０４ａが形成されている。一方、前記ベーン体１０８には複数のベーン１０８ａが形成されており、これらのベーン１０８ａもベーン体１０８の回転軸を中心に放射状に配置されている。そして、前記ベーン体１０８をハウジング１０４内に組み付けるには、凹部１０４ａにベーン１０８ａを収容するように位置決めする。この時、ベーン１０８ａによって凹部１０４ａを二つに区切り各ベーン１０８ａの両側に、油圧室Ａ，Ｂを形成する。そして、形成された各油圧室Ａ，Ｂに対する油圧制御（図５は、油圧室Ａに駆動油が注入されている状態）によりベーン体１０８を回転駆動する。その結果、ベーン体１０８に接続されたカムシャフト１０６の回転位相をスプロケット１０２に対して変化させて、バルブタイミングの制御を行うことが可能になる。なお、このようなＶＶＴアッセンブリ１００は、各油圧室Ａ，Ｂに供給される駆動油が隣接する油圧室間で漏れないようにシール部材１１２（図５の例では８個）が配置されている。このシール部材１１２は、背面よりスプリングビーム１１４で付勢されている。シール部材１１２を付勢することによりハウジング１０４とベーン体１０８とを接触状態で相対運動させつつ駆動油の漏れを防止することができる。
【０００４】
前述したようなシールを行うために、前記ハウジング１０４の内径を加工する場合、寸法精度の高い精密加工が施される。図６に示すように、ベーン体１０８とスプロケット１０２とはカムシャフト１０６によって位置決めされるので、スプロケット１０２とハウジング１０４の同軸度が悪く組み付けられた場合、ハウジング１０４とベーン体１０８の軸心がずれることになり前記シール部材１１２が機能しなくなり油漏れを起こし性能を損ねる。そのためスプロケット１０２とハウジング１０４とは同軸度はφ０．１以内に組み付ける必要がある。一般的には、組み付け精度を保証するために、スプロケット１０２やハウジング１０４の外形も内径と同様に高精度に加工し外形基準で両者の組付けを行っている。例えば、図６の符号Ａで示す部分に加工を施す。例えば、図７に示すようにスプロケット１０２の一部に精密加工した位置決め部材１０２ａを形成し、同様に精密加工されたハウジング１０４の外形部分と結合させて両者の同軸度を向上させた後、固定を行っている。
【０００５】
【発明が解決しようとする課題】
しかし、ＶＶＴアッセンブリ１００の機能上要求される精度は、前記ハウジング１０４において、ベーン体１０８と接触する内径部分の加工精度のみである。同様に、スプロケット１０２においてはカムシャフト１０６と接触する部分の加工精度が要求される。つまり、これらの部品は、いわゆる内径基準部品である。しかし、図７に示したように、スプロケット１０２やハウジング１０４において、実際に動作や性能に影響を与えない部分に位置決めのためだけに精密加工を施すと加工コストが著しく増加してしまうという問題がある。
【０００６】
本発明は、上記課題に鑑みなされたものであり、内径基準部品を用いた組み立てを行う場合に、位置決め用の精密加工を行うことなく内径基準部品の組み立て位置決めを行うことのできる内径基準部品の組み立て方法及び組立位置決め装置を提供する。
【０００７】
【課題を解決するための手段】
上記のような目的を達成するために、本発明は、基準ベース板に立設された基準軸により内径加工が高精度で行われた第一内径基準部品の内面部分を支持する支持工程と、前記基準軸に係合し当該基準軸を中心に開閉する複数の開閉アームの開動作により前記第一内径基準部品上に積層された内径加工が高精度で行われた第二内径基準部品の内面部分を均一に付勢し当該第二内径基準部品の中心と前記基準軸の中心とを一致させる中心合わせ工程と、中心合わせされた第二内径基準部品の外面の少なくとも３カ所を均一の付勢力で基準軸方向に付勢し第二内径基準部品の位置を維持する外周付勢工程と、前記開閉アームを閉動作させ前記第二内径基準部品から退避させた後、基準軸により位置決めされた第一内径基準部品と外面の付勢により位置決めされた第二内径基準部品とを結合固定する固定工程と、を含むことを特徴とする。
【０００８】
上記のような目的を達成するために、本発明は、内径加工が高精度で行われた第一内径基準部品の内面部分を支持可能な基準軸を有する基準ベース板と、前記基準軸に係合し当該基準軸を中心に開閉する複数のアームであって、前記第一内径基準部品に積層された内径加工が高精度で行われた第二内径基準部品の内径部分に挿入され、開動作により前記第二内径基準部品の内面部分を付勢し当該第二内径基準部品の中心と前記基準軸の中心とを一致させる開閉アームと、前記第二内径基準部品の外面の少なくとも３カ所を均一の付勢力で基準軸方向に付勢し第二内径基準部品の位置を維持する付勢バーと、を含むことを特徴とする。
【０００９】
ここで、内径基準部品とは、少なくとも部品の内径加工が精密加工で行われ、外形部分の加工精度は任意の部品であり、例えば、リング状の部品や中空部品である。
【００１０】
この構成によれば、第一内径基準部品及び第二内径基準部品は、いずれも精密加工が施された内面が基準軸を基準に支持されることになり、外形部分の加工精度に左右されることなく、部品の機能上必要とされる精密加工部分を用いて容易かつ正確に組立位置決めを行うことができる。その結果、不必要な精密加工を行う必要がなくなり部品のコスト低減を行うことができる。
【００１１】
【発明の実施の形態】
以下、本発明の好適な実施の形態（以下、実施形態という）を図面に基づき説明する。なお、本実施形態においては、内径寸法の加工が精密に行われた内径基準部品を用いた組立体の一例として、図５、図６に示すベーン式バルブタイミング制御装置の中間組立体（ＶＶＴアッセンブリ）１００とほぼ同じ部品を利用して説明を行う。
【００１２】
図１には、組立位置決め装置１０の中心位置合わせ機構の構成概念図が示されている。図１においては、内径寸法の加工が精密に行われた第一内径基準部品として示されるＶＶＴアッセンブリ１００（図６参照）のスプロケット１０２の上に内径寸法の加工が精密に行われた第二内径基準部品として示されるハウジング１０４が積層され、相互の中心位置合わせが行われた状態が示されている。ただし、本実施形態の組立位置決め装置１０を利用する場合、組立対象となるスプロケット１０２には、図７に示す位置決め部材１０２ａ等の位置決め用の加工は施されていない。同様に、ハウジング１０４の外周面には精密加工が施されておらず、例えば、焼結したままの状態で、外形寸法は１ｍｍ程度のばらつきを有している。
【００１３】
組み立て対象であるスプロケット１０２やハウジング１０４（ベーン体１０８、シール部材１１２、スプリングビーム１１４は既に前工程でハウジング１０４に組み付けられている）は、基準ベース板としての組立用パレット１２に搭載された状態で組立位置決め装置１０に投入される。前記組立用パレット１２は平坦なベース面に垂直に立設された基準軸１４を有している。この基準軸１４は、前記スプロケット１０２において精密加工された内面部分と係合し支持する基部１４ａと、ハウジング１０４の位置決めのための後述するテーパシャフトと係合する先端係合部１４ｂとで構成されている。この組立用パレット１２は組立対象のＶＶＴアッセンブリ１００を搭載して各工程間を移動する搬送手段としての役割と、組立位置決め装置１０に対する位置決め基準としての役割を有している。
【００１４】
スプロケット１０２とハウジング１０４を搭載した組立用パレット１２は、コンベア等の搬送手段によって組立位置決め装置１０の直下位置に投入されると、アクチュエータ１６ａによって昇降自在なリフタ１６によって位置決め位置まで上昇する。この時、組立用パレット１２は、組立位置決め装置１０の位置決めプレート１８に設けられた位置決め開口１８ａに係合することによって、組立位置決め装置１０に対する位置決めが行われる。なお、スプロケット１０２はカムシャフト１０６（図６参照）と係合する精密加工された内面部１０２ａが組立用パレット１２の基準軸１４の基部１４ａに装着された時点で組立用パレット１２に対する位置決めが行われている（支持工程）。
【００１５】
この時点で、上方よりハウジング位置決めツール２０が組立用パレット１２に対して降下してくる。このハウジング位置決めツール２０は、前記基準軸１４の先端係合部１４ｂに係合可能なテーパシャフト２２と当該テーパシャフト２２によって開閉自在な複数の開閉アーム２４（図１では２本のみ図示）と、前記テーパシャフト２２を上下駆動するアクチュエータ（例えばエアシリンダ２６）と、開閉アーム２４等を含む本体部分を動作位置（図１の位置）と非動作位置との間で移動させる移動ユニット２８等から構成されている。
【００１６】
前記開閉アーム２４はスプリング等の付勢手段により中心方向に付勢された状態で、移動ユニット２８の駆動によって組立用パレット１２に搭載されたスプロケット１０２上に積層されたハウジング１０４の内面部に挿入される。この時、開閉アーム２４は、閉じた状態で、図２に示すように、ハウジング１０４に収納配置されたベーン体１０８が規定する油圧室Ａまたは油圧室Ｂに挿入される（図２では油圧室Ａに４本の開閉アーム２４が挿入され、その後、開閉アーム２４が開いた状態を示す）。また、この時、前記テーパシャフト２２は、組立用パレット１２の基準軸１４の先端係合部１４ｂに係合する。この時、ハウジング位置決めツール２０の基準軸１４に対する位置決めが行われる。そして、開閉アーム２４が油圧室Ａに挿入されたことがセンサ等により確認されると、エアシリンダ２６が降下してテーパシャフト２２を基準軸１４に沿って押し下げる。図１に示すように、開閉アーム２４の内側の面は前記テーパシャフト２２のテーパ面２２ａと接触可能に配置されているので、開閉アーム２４はテーパシャフト２２の降下と共に、基準軸１４を中心に開動作を行い、ハウジング１０４の精密加工された内面（凹部１０４ａ）を付勢し、図２に示すように、ハウジング１０４全体を基準軸１４の中心位置に位置決めする（中心合わせ工程）。なお、図２においては、開閉アーム２４を４本示しているが、３本以上で均一にハウジング１０４の内面部分を付勢できれば、開閉アーム２４の本数は任意である。
【００１７】
前記ハウジング１０４は開閉アーム２４の開動作による位置決め状態が維持されたまま、図３に示すように、３方向（１２０°間隔）から位置維持機構３０（１基のみ全体像を図示し、他の２基は一部のみ図示）によって外周面より付勢把持される。この位置維持機構３０は、例えば、ナチュラルクランプ機構等で構成され、付勢手段（例えば、スプリング３２）によりハウジング１０４の中心方向に付勢力を有する付勢バー３４を含んでいる。また、前記付勢バー３４は、当該付勢バー３４の付勢方向と直交する方向に摺動自在な楔３６によって付勢位置を保持できるようになっている。つまり、前記楔３６も付勢手段（例えばスプリング３８）によって、常時図中左方向に付勢されるようになっている。従って、付勢バー３４はハウジング１０４の外周面に当接した位置で楔３６によって固定されることになる。なお、前記スプリング３２，３８による付勢力は付勢バー３４がハウジング１０４の形状を変形させない程度に適宜選択される。
【００１８】
また、付勢バー３４には、前記スプリング３２の付勢力に逆らって当該付勢バー３４をハウジング１０４から遠ざける方向に引き戻すアクチュエータ（例えばエアシリンダ４０）が配置されている。さらに、位置維持機構３０には、楔３６の先端３６ａに当接し楔３６を図中右方向に押し戻すアクチュエータ（例えばエアシリンダ４２）が配置されている。
【００１９】
このように構成される位置維持機構３０は、エアシリンダ４２のシャフト４２ａが突出し先端３６ａを押し戻すことによって付勢バー３４の固定が解放され、続いてエアシリンダ４０が引込み動作を行うことにより付勢バー３４によるハウジング１０４の位置決め固定を解除可能となる。
【００２０】
上述したような位置維持機構３０において、エアシリンダ４０を突出動作させ、付勢バー３４をフリーの状態にすることにより、付勢バー３４の先端部３４ａはスプリング３２により所定付勢力でハウジング１０４の外周面を付勢可能となる。なお、スプリング３２，３８の付勢力は必要に応じて適宜選択可能であるが、スプリング３２の付勢力よりスプリング３８の付勢力を大きく設定することにより、ハウジング１０４の外周面の付勢と位置固定を良好に行うことができる。そして、同様な構成の位置維持機構３０によって少なくとも３方向から付勢支持されることにより、開閉アーム２４の開動作による位置決めされたハウジング１０４の位置が維持される（外周付勢工程）。図４には、開閉アーム２４及び位置維持機構３０によって位置決め維持されたハウジング１０４の状態図が示されている。
【００２１】
そして、各付勢バー３４によるハウジング１０４の付勢がセンサ等により確認されたらエアシリンダ２６が後退し、開閉アーム２４が閉動作を行う。そして、移動ユニット２８の駆動により組立位置決め装置１０をハウジング１０４から退避させる。
【００２２】
前述したように、位置維持機構３０の付勢バー３４によって少なくとも３方向から付勢されたハウジング１０４は前記基準軸１４を中心に位置決めされた状態を維持している。この状態で、図示しないインサートマシンにより供給されるカバー１１０（図６参照）をハウジング１０４の上面に供給し、固定手段（例えば、ボルト１１６）等によりカバー１１０、ハウジング１０４、スプロケット１０２を一体的に締付固定する（固定工程）。
【００２３】
このように、内径基準部品であるハウジング１０４及びスプロケット１０２は機能上必要とされ精密加工された内面部分のみを利用して位置決めすることが可能になり、内径基準部品に機能上必要ない位置合わせ用の精密加工を行う必要が無くなり各部品の加工コストを低減することができる。
【００２４】
カバー１１０の装着固定によりハウジング１０４及びスプロケット１０２の固定が終了したら、位置維持機構３０によるハウジング１０４の付勢を解除すると共に、リフタ１６を降下させ、組立用パレット１２を組立位置決め装置１０から排出し、コンベア等の搬送手段に受け渡し次工程に組立用パレット１２と共に組付けが完了したＶＶＴアッセンブリを移動させる。その後、リフタ１６は位置決め組付け前のスプロケット１０２やハウジング１０４が搭載された組立用パレット１２の供給を待ち、供給された後、前述と同じ位置決め固定処理を行う。
【００２５】
なお、本実施形態においては、内径基準部品としてＶＶＴアッセンブリのハウジングやスプロケットを例に取り位置決め手順を説明したが、内径寸法が精密加工された部品であれば、他の部品に対して適用することが可能であり、同様な効果を得ることができる。また、本実施形態では、位置維持機構としてナチュラルクランプ機能を用いた例を示したが、内径基準部品の外周面を均一な付勢力で付勢し内径基準部品の位置を維持できる構造であれば、他の機構を用いても本実施形態と同様な効果を得ることができる。
【００２６】
【発明の効果】
本発明によれば、第一内径基準部品及び第二内径基準部品は、いずれも精密加工が施された内面が基準軸を基準に支持されることになり、外形部分の加工精度に左右されることなく、部品の機能上必要とされる精密加工部分を用いて容易かつ正確に組立位置決めを行うことができる。その結果、不必要な位置決め用の精密加工を行う必要がなくなり部品のコスト低減を行うことができる。
【図面の簡単な説明】
【図１】 本発明の実施形態に係る組立位置決め装置による支持工程及び中心合わせ工程を実施する構造を説明する説明図である。
【図２】 本発明の実施形態に係る組立位置決め装置のハウジング位置決めツールの開閉アームによるハウジングの位置決め係合位置を説明する説明図である。
【図３】 本発明の実施形態に係る組立位置決め装置の位置維持機構によるハウジングの位置決め位置保持状態を説明する説明図である。
【図４】 本発明の実施形態に係る組立位置決め装置のハウジング位置決めツールと位置維持機構とがハウジングを位置決め固定している状態を説明する説明図である。
【図５】 一般的なベーン式バルブタイミング制御装置の中間組立体（ＶＶＴアッセンブリ）の概略構成を説明する説明図である。
【図６】 図５のベーン式バルブタイミング制御装置の断面図である。
【図７】 スプロケットとハウジングの位置決めを行うための位置決め部材の一例を示す説明図である。
【符号の説明】
１０ 組立位置決め装置、１２ 組立用パレット（基準ベース板）、１４ 基準軸、１４ａ 基部、１４ｂ 先端係合部、１６ リフタ、１８ 位置決めプレート、２０ ハウジング位置決めツール、２２ テーパシャフト、２４ 開閉アーム、２６，４０，４２ エアシリンダ、２８ 移動ユニット、３０ 位置維持機構、３２，３８ スプリング、３４ 付勢バー、３６ 楔、１００ ベーン式バルブタイミング制御装置の中間組立体（ＶＶＴアッセンブリ）、１０２ スプロケット、１０４ ハウジング、１０８ ベーン体。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembling method and an assembling positioning device for an inner diameter reference component, and in particular, an assembling method and an assembling positioning device for an inner diameter reference component in which precision machining is performed only on the inner surface and the outer surface is positioned by rough machining of the inner diameter reference components. About.
[0002]
[Prior art]
When an assembly is formed by combining parts that have been processed conventionally, it is necessary to align the two. In particular, when forming one high-precision machined surface with a plurality of combined parts, or when combining with other parts, positioning accuracy during assembly becomes important. When the positioning accuracy is lowered, a malfunction or assembly failure occurs even though precision machining is performed to maintain smooth operation and airtightness.
[0003]
As an example of an assembly part that requires positioning accuracy during assembly, for example, an opening / closing timing of an intake / exhaust valve provided in a cylinder of the internal combustion engine during operation of the internal combustion engine as disclosed in JP-A-9-303119 is disclosed. There is an intermediate assembly (hereinafter simply referred to as a VVT assembly) of a vane type valve timing control apparatus that variably adjusts the valve timing. As shown in the conceptual diagrams of FIGS. 5 and 6, the VVT assembly 100 generally includes a housing 104 integrally connected to a sprocket 102 to which power from a crankshaft is transmitted, and the housing 104 within the housing 104. And the vane body 108 integrally connected to one end of a cam shaft 106 on which a cam for opening and closing the valve is disposed, and the sprocket 102 with the housing 104 interposed therebetween. It is comprised by the cover 110 etc. which are fixed to the opposing surface. The housing 104 has a plurality of recesses 104a. On the other hand, a plurality of vanes 108 a are formed in the vane body 108, and these vanes 108 a are also arranged radially around the rotation axis of the vane body 108. In order to assemble the vane body 108 into the housing 104, the vane body 108 is positioned so as to accommodate the vane 108a in the recess 104a. At this time, the recesses 104a are divided into two by the vanes 108a, and the hydraulic chambers A and B are formed on both sides of each vane 108a. Then, the vane body 108 is rotationally driven by hydraulic control (FIG. 5 shows a state in which driving oil is injected into the hydraulic chamber A) with respect to the formed hydraulic chambers A and B. As a result, it is possible to control the valve timing by changing the rotational phase of the camshaft 106 connected to the vane body 108 with respect to the sprocket 102. In such a VVT assembly 100, seal members 112 (eight in the example of FIG. 5) are arranged so that the drive oil supplied to the hydraulic chambers A and B does not leak between adjacent hydraulic chambers. . The seal member 112 is urged by a spring beam 114 from the back surface. By energizing the seal member 112, it is possible to prevent the drive oil from leaking while relatively moving the housing 104 and the vane body 108 in contact with each other.
[0004]
In order to perform the sealing as described above, when the inner diameter of the housing 104 is processed, precision processing with high dimensional accuracy is performed. As shown in FIG. 6, since the vane body 108 and the sprocket 102 are positioned by the camshaft 106, when the coaxiality of the sprocket 102 and the housing 104 is poorly assembled, the axes of the housing 104 and the vane body 108 are displaced. As a result, the sealing member 112 does not function and oil leakage occurs, thereby impairing performance. Therefore, it is necessary to assemble the sprocket 102 and the housing 104 so that the coaxiality is within φ0.1. In general, in order to guarantee the assembly accuracy, the outer shapes of the sprocket 102 and the housing 104 are processed with high accuracy in the same manner as the inner diameter, and both are assembled on the basis of the outer shape. For example, processing is performed on the portion indicated by the symbol A in FIG. For example, as shown in FIG. 7, a precision-worked positioning member 102a is formed on a part of the sprocket 102, and is combined with an outer portion of the housing 104 that is similarly precision-machined to improve the coaxiality between the two, and then fixed. It is carried out.
[0005]
[Problems to be solved by the invention]
However, the accuracy required for the function of the VVT assembly 100 is only the processing accuracy of the inner diameter portion in contact with the vane body 108 in the housing 104. Similarly, in the sprocket 102, the processing accuracy of the portion in contact with the camshaft 106 is required. That is, these parts are so-called inner diameter reference parts. However, as shown in FIG. 7, in the sprocket 102 and the housing 104, if a precision machining is performed only for positioning on a portion that does not actually affect the operation or performance, there is a problem that the machining cost is remarkably increased. is there.
[0006]
The present invention has been made in view of the above problems, and when performing assembly using an inner diameter reference component, an inner diameter reference component capable of assembling and positioning the inner diameter reference component without performing precision processing for positioning. An assembly method and an assembly positioning apparatus are provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a supporting step of supporting an inner surface portion of a first inner diameter reference component in which inner diameter processing is performed with high accuracy by a reference shaft erected on a reference base plate, The inner surface of the second inner diameter reference component, which has been subjected to inner diameter processing performed on the first inner diameter reference component with high accuracy by opening operations of a plurality of opening and closing arms that engage with the reference shaft and open and close about the reference shaft. A centering step for uniformly biasing the portion so that the center of the second inner diameter reference part and the center of the reference axis coincide with each other, and a uniform biasing force at least at three locations on the outer surface of the centered second inner diameter reference part The outer peripheral biasing step of biasing in the reference axis direction to maintain the position of the second inner diameter reference part, and the opening / closing arm is closed and retracted from the second inner diameter reference part, and then is positioned by the reference axis. By biasing the inner diameter reference part and the outer surface Characterized in that it comprises a-decided fit a second inner diameter reference component and a fixing step of attaching fixing, the.
[0008]
In order to achieve the above object, the present invention relates to a reference base plate having a reference shaft capable of supporting an inner surface portion of a first inner diameter reference component that has been subjected to inner diameter processing with high accuracy, and the reference shaft. A plurality of arms that open and close about the reference axis, and are inserted into the inner diameter portion of the second inner diameter reference component that is laminated with the first inner diameter reference component with high accuracy, and opens. The opening / closing arm that urges the inner surface portion of the second inner diameter reference component to match the center of the second inner diameter reference component with the center of the reference shaft, and at least three locations on the outer surface of the second inner diameter reference component are uniform. And an urging bar for urging in the reference axis direction with the urging force and maintaining the position of the second inner diameter reference component.
[0009]
Here, the inner diameter reference component is a component in which at least inner diameter processing of the component is performed by precision processing, and the processing accuracy of the outer portion is an arbitrary component, for example, a ring-shaped component or a hollow component.
[0010]
According to this configuration, the first inner diameter reference component and the second inner diameter reference component are both supported on the inner surface on which the precision machining has been performed with reference to the reference axis, and depend on the machining accuracy of the outer portion. Therefore, assembly and positioning can be performed easily and accurately using a precision machined part required for the function of the part. As a result, it is not necessary to perform unnecessary precision machining, and the cost of parts can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention (hereinafter referred to as embodiments) will be described with reference to the drawings. In this embodiment, as an example of an assembly using an inner diameter reference part that has been precisely machined to have an inner diameter dimension, an intermediate assembly (VVT assembly) of the vane type valve timing control device shown in FIGS. ) Explanation will be made using almost the same parts as 100.
[0012]
FIG. 1 shows a conceptual diagram of the configuration of the center alignment mechanism of the assembly positioning apparatus 10. In FIG. 1, the second inner diameter is precisely machined on the sprocket 102 of the VVT assembly 100 (see FIG. 6) shown as the first inner diameter reference component that has been precisely machined. The housing 104 shown as a reference part is laminated and the center alignment of each other is performed. However, when the assembly positioning apparatus 10 of the present embodiment is used, the sprocket 102 to be assembled is not subjected to positioning processing such as the positioning member 102a shown in FIG. Similarly, the outer peripheral surface of the housing 104 is not subjected to precision processing. For example, the outer dimensions of the housing 104 have a variation of about 1 mm in a sintered state.
[0013]
The sprocket 102 and the housing 104 to be assembled (the vane body 108, the seal member 112, and the spring beam 114 are already assembled in the housing 104 in the previous process) are mounted on the assembly pallet 12 as a reference base plate. Is inserted into the assembly positioning apparatus 10. The assembling pallet 12 has a reference shaft 14 erected vertically on a flat base surface. The reference shaft 14 includes a base portion 14a that engages and supports a precision-machined inner surface portion of the sprocket 102, and a tip engagement portion 14b that engages a tapered shaft (described later) for positioning the housing 104. ing. The assembling pallet 12 has a role as a conveying means for mounting the VVT assembly 100 to be assembled and moving between the processes, and a role as a positioning reference for the assembling positioning apparatus 10.
[0014]
The assembly pallet 12 on which the sprocket 102 and the housing 104 are mounted is moved up to a positioning position by a lifter 16 that can be moved up and down by an actuator 16a when it is put into a position immediately below the assembly positioning device 10 by a conveying means such as a conveyor. At this time, the assembly pallet 12 is positioned with respect to the assembly positioning device 10 by engaging with a positioning opening 18 a provided in the positioning plate 18 of the assembly positioning device 10. The sprocket 102 is positioned with respect to the assembly pallet 12 when the precision-processed inner surface portion 102a that engages with the camshaft 106 (see FIG. 6) is mounted on the base portion 14a of the reference shaft 14 of the assembly pallet 12. (Support process).
[0015]
At this point, the housing positioning tool 20 descends with respect to the assembly pallet 12 from above. The housing positioning tool 20 includes a tapered shaft 22 that can be engaged with the tip engaging portion 14b of the reference shaft 14, and a plurality of opening / closing arms 24 (only two are shown in FIG. 1) that can be opened and closed by the tapered shaft 22. An actuator (for example, an air cylinder 26) that drives the taper shaft 22 up and down, and a moving unit 28 that moves a main body portion including an opening / closing arm 24 and the like between an operating position (position shown in FIG. 1) and a non-operating position. Has been.
[0016]
The opening / closing arm 24 is inserted into the inner surface of the housing 104 stacked on the sprocket 102 mounted on the assembly pallet 12 by driving the moving unit 28 while being biased in the center direction by a biasing means such as a spring. Is done. At this time, the open / close arm 24 is closed and inserted into the hydraulic chamber A or the hydraulic chamber B defined by the vane body 108 housed in the housing 104 as shown in FIG. A shows that four open / close arms 24 are inserted into A and then the open / close arms 24 are open). At this time, the tapered shaft 22 is engaged with the tip engaging portion 14 b of the reference shaft 14 of the assembly pallet 12. At this time, the housing positioning tool 20 is positioned with respect to the reference shaft 14. When it is confirmed by a sensor or the like that the opening / closing arm 24 has been inserted into the hydraulic chamber A, the air cylinder 26 descends and pushes down the tapered shaft 22 along the reference axis 14. As shown in FIG. 1, the inner surface of the opening / closing arm 24 is disposed so as to be in contact with the tapered surface 22 a of the tapered shaft 22, so that the opening / closing arm 24 is centered around the reference axis 14 as the tapered shaft 22 is lowered. An opening operation is performed to bias the precision-processed inner surface (recess 104a) of the housing 104, and the entire housing 104 is positioned at the center position of the reference shaft 14 as shown in FIG. 2 (centering step). In FIG. 2, four open / close arms 24 are shown, but the number of open / close arms 24 is arbitrary as long as three or more can uniformly bias the inner surface portion of the housing 104.
[0017]
As shown in FIG. 3, the housing 104 is maintained in the positioning state by the opening operation of the opening / closing arm 24, and as shown in FIG. The two units are urged and gripped from the outer peripheral surface by a part of them). The position maintaining mechanism 30 is constituted by, for example, a natural clamp mechanism or the like, and includes a biasing bar 34 having a biasing force in the center direction of the housing 104 by biasing means (for example, a spring 32). The urging bar 34 can hold the urging position by a wedge 36 slidable in a direction orthogonal to the urging direction of the urging bar 34. That is, the wedge 36 is always urged in the left direction in the figure by the urging means (for example, the spring 38). Therefore, the urging bar 34 is fixed by the wedge 36 at a position in contact with the outer peripheral surface of the housing 104. The urging force by the springs 32 and 38 is appropriately selected so that the urging bar 34 does not deform the shape of the housing 104.
[0018]
The urging bar 34 is provided with an actuator (for example, an air cylinder 40) that pulls the urging bar 34 away from the housing 104 against the urging force of the spring 32. Further, the position maintaining mechanism 30 is provided with an actuator (for example, an air cylinder 42) that contacts the tip 36a of the wedge 36 and pushes the wedge 36 in the right direction in the figure.
[0019]
The position maintaining mechanism 30 configured as described above is biased by the shaft 42a of the air cylinder 42 projecting and the tip 36a being pushed back to release the biasing bar 34, and then the air cylinder 40 is retracted. The positioning and fixing of the housing 104 by the bar 34 can be released.
[0020]
In the position maintaining mechanism 30 as described above, the air cylinder 40 is protruded and the urging bar 34 is brought into a free state, whereby the tip end portion 34 a of the urging bar 34 is moved by the spring 32 with a predetermined urging force. The outer peripheral surface can be biased. The urging force of the springs 32 and 38 can be appropriately selected as necessary. However, by setting the urging force of the spring 38 larger than the urging force of the spring 32, the urging force and the position of the outer surface of the housing 104 are fixed. Can be performed satisfactorily. The position maintaining mechanism 30 having the same configuration is biased and supported from at least three directions, so that the position of the housing 104 positioned by the opening operation of the opening / closing arm 24 is maintained (peripheral biasing step). FIG. 4 shows a state diagram of the housing 104 that has been positioned and maintained by the opening / closing arm 24 and the position maintaining mechanism 30.
[0021]
When the urging of the housing 104 by each urging bar 34 is confirmed by a sensor or the like, the air cylinder 26 is retracted and the open / close arm 24 is closed. Then, the assembly positioning apparatus 10 is retracted from the housing 104 by driving the moving unit 28.
[0022]
As described above, the housing 104 urged from at least three directions by the urging bar 34 of the position maintaining mechanism 30 maintains a state of being positioned around the reference shaft 14. In this state, a cover 110 (see FIG. 6) supplied by an insert machine (not shown) is supplied to the upper surface of the housing 104, and the cover 110, the housing 104, and the sprocket 102 are integrated together by a fixing means (for example, a bolt 116). Tighten and fix (fixing process).
[0023]
As described above, the housing 104 and the sprocket 102 which are the inner diameter reference parts can be positioned by using only the inner surface portion which is required for the function and is precisely processed, and for the positioning which is not necessary for the inner diameter reference part. This eliminates the need for precise machining and reduces the machining cost of each part.
[0024]
When the fixing of the housing 104 and the sprocket 102 is completed by attaching and fixing the cover 110, the bias of the housing 104 by the position maintaining mechanism 30 is released, the lifter 16 is lowered, and the assembly pallet 12 is discharged from the assembly positioning device 10. Then, the VVT assembly having been assembled together with the assembly pallet 12 is moved to the next process of delivery to a conveying means such as a conveyor. After that, the lifter 16 waits for the supply of the assembly pallet 12 on which the sprocket 102 and the housing 104 are mounted before positioning and assembly. After the supply, the lifter 16 performs the same positioning and fixing process as described above.
[0025]
In this embodiment, the positioning procedure has been described taking the housing and sprocket of the VVT assembly as an example of the inner diameter reference part. However, as long as the inner diameter dimension is a precision machined part, it can be applied to other parts. Can be obtained, and similar effects can be obtained. In the present embodiment, the example using the natural clamp function as the position maintaining mechanism is shown. However, if the outer peripheral surface of the inner diameter reference part is biased with a uniform biasing force and the position of the inner diameter reference part can be maintained. Even if other mechanisms are used, the same effects as in the present embodiment can be obtained.
[0026]
【The invention's effect】
According to the present invention, both the first inner diameter reference part and the second inner diameter reference part are supported on the basis of the reference axis on the inner surface that has been subjected to precision machining, and depends on the machining accuracy of the outer portion. Therefore, assembly and positioning can be performed easily and accurately using a precision machined part required for the function of the part. As a result, it is not necessary to perform unnecessary precision processing for positioning, and the cost of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view illustrating a structure for performing a supporting step and a centering step by an assembly positioning apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory view for explaining a positioning engagement position of a housing by an opening / closing arm of a housing positioning tool of the assembly positioning apparatus according to the embodiment of the present invention.
FIG. 3 is an explanatory view for explaining a holding position holding state of the housing by the position maintaining mechanism of the assembly positioning apparatus according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram illustrating a state in which the housing positioning tool and the position maintaining mechanism of the assembly positioning apparatus according to the embodiment of the present invention position and fix the housing.
FIG. 5 is an explanatory diagram illustrating a schematic configuration of an intermediate assembly (VVT assembly) of a general vane valve timing control device.
6 is a cross-sectional view of the vane type valve timing control device of FIG.
FIG. 7 is an explanatory view showing an example of a positioning member for positioning the sprocket and the housing.
[Explanation of symbols]
10 assembly positioning device, 12 assembly pallet (reference base plate), 14 reference shaft, 14a base, 14b tip engaging portion, 16 lifter, 18 positioning plate, 20 housing positioning tool, 22 taper shaft, 24 open / close arm, 26, 40, 42 Air cylinder, 28 moving unit, 30 position maintaining mechanism, 32, 38 spring, 34 biasing bar, 36 wedge, 100 Vane valve timing control intermediate assembly (VVT assembly), 102 sprocket, 104 housing, 108 Vane body.

Claims (2)

基準ベース板に立設された基準軸により内径加工が高精度で行われた第一内径基準部品の内面部分を支持する支持工程と、
前記基準軸に係合し当該基準軸を中心に開閉する複数の開閉アームの開動作により前記第一内径基準部品上に積層された内径加工が高精度で行われた第二内径基準部品の内面部分を均一に付勢し当該第二内径基準部品の中心と前記基準軸の中心とを一致させる中心合わせ工程と、
中心合わせされた第二内径基準部品の外面の少なくとも３カ所を均一の付勢力で基準軸方向に付勢し第二内径基準部品の位置を維持する外周付勢工程と、
前記開閉アームを閉動作させ前記第二内径基準部品から退避させた後、基準軸により位置決めされた第一内径基準部品と外面の付勢により位置決めされた第二内径基準部品とを結合固定する固定工程と、
を含むことを特徴とする内径基準部品の組み立て方法。A supporting step for supporting the inner surface portion of the first inner diameter reference component in which the inner diameter processing is performed with high accuracy by the reference shaft erected on the reference base plate;
The inner surface of the second inner diameter reference component, which has been subjected to inner diameter processing performed on the first inner diameter reference component with high accuracy by opening operations of a plurality of opening and closing arms that engage with the reference shaft and open and close about the reference shaft. A centering step of uniformly energizing the portion to match the center of the second inner diameter reference part and the center of the reference axis;
An outer peripheral biasing step of biasing at least three locations on the outer surface of the centered second inner diameter reference component in the reference axial direction with a uniform biasing force to maintain the position of the second inner diameter reference component;
After the opening / closing arm is closed and retracted from the second inner diameter reference component, the first inner diameter reference component positioned by the reference shaft and the second inner diameter reference component positioned by the biasing of the outer surface are coupled and fixed. Process,
A method for assembling an inner diameter reference component. 内径加工が高精度で行われた第一内径基準部品の内面部分を支持可能な基準軸を有する基準ベース板と、
前記基準軸に係合し当該基準軸を中心に開閉する複数のアームであって、前記第一内径基準部品に積層された内径加工が高精度で行われた第二内径基準部品の内径部分に挿入され、開動作により前記第二内径基準部品の内面部分を付勢し当該第二内径基準部品の中心と前記基準軸の中心とを一致させる開閉アームと、
前記第二内径基準部品の外面の少なくとも３カ所を均一の付勢力で基準軸方向に付勢し第二内径基準部品の位置を維持する付勢バーと、
を含むことを特徴とする組立位置決め装置。A reference base plate having a reference axis capable of supporting the inner surface portion of the first inner diameter reference component in which the inner diameter processing is performed with high accuracy;
A plurality of arms that engage with the reference shaft and open and close around the reference shaft, and the inner diameter portion of the second inner diameter reference component that is stacked on the first inner diameter reference component is accurately processed. An open / close arm that is inserted and urges the inner surface portion of the second inner diameter reference component by an opening operation to match the center of the second inner diameter reference component with the center of the reference shaft;
An urging bar for urging at least three locations on the outer surface of the second inner diameter reference part in the reference axial direction with a uniform urging force to maintain the position of the second inner diameter reference part;
The assembly positioning apparatus characterized by including.
JP11593899A 1999-04-23 1999-04-23 Method for assembling inner diameter reference part and assembly positioning device Expired - Fee Related JP3738601B2 (en)

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JP2002317611A (en) * 2001-04-18 2002-10-31 Aisin Seiki Co Ltd Valve timing controlling device
WO2009147751A1 (en) * 2008-06-06 2009-12-10 平田機工株式会社 Method and device for adjusting valve clearance
DE102012214764B4 (en) * 2012-08-20 2018-04-26 Schaeffler Technologies AG & Co. KG Fastening arrangement for connecting a camshaft adjuster with a camshaft end of a camshaft
JP6007812B2 (en) * 2013-02-07 2016-10-12 トヨタ自動車株式会社 Manufacturing method of variable valve timing mechanism

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