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JP4254029B2 - Half toroidal continuously variable transmission - Google Patents
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JP4254029B2 - Half toroidal continuously variable transmission - Google Patents

Half toroidal continuously variable transmission Download PDF

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Publication number
JP4254029B2
JP4254029B2 JP2000234380A JP2000234380A JP4254029B2 JP 4254029 B2 JP4254029 B2 JP 4254029B2 JP 2000234380 A JP2000234380 A JP 2000234380A JP 2000234380 A JP2000234380 A JP 2000234380A JP 4254029 B2 JP4254029 B2 JP 4254029B2
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output
power transmission
output disks
disks
transmission gear
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JP2002048206A5 (en
JP2002048206A (en
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功久 小林
伸夫 後藤
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NSK Ltd
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NSK Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H15/00Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04Gearings providing a continuous range of gear ratios
    • F16H15/06Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Friction Gearing (AREA)
  • Transmission Devices (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、自動車用の変速機として、あるいは各種産業機械用の変速機として用いられるハーフトロイダル型無段変速機に関する。
【0002】
【従来の技術】
近年、自動車用の変速機として、あるいは各種産業機械用の変速機としてトロイダル型無段変速機が使用されている。このトロイダル型無段変速機において、例えば、特開平11−63139号公報に示すように、一対のディスクが2組設けられ、これら2組のディスクが軸方向に沿って配置されているとともに、異なる組の相互に隣接する出力ディスク同士が一体化されている。さらに、一体化された出力ディスクの外周縁部に動力伝達ギアが固定されている。
【0003】
前記出力ディスクは、浸炭組織の層の厚みを大きくなるように浸炭し、ギアは、浸炭組織の層の厚みが小さくなるように浸炭し、出力ディスクとギアとを溶接して一体化したものである。
【0004】
前記構成によれば、出力ディスク同士を一体化することでバリエータの軸方向の長さを短縮することができる。また、出力ディスクに働くローディング力が相殺されるのでディスクの厚さを薄くできるという利点がある。
【0005】
【発明が解決しようとする課題】
しかしながら、出力ディスク同士を一体化すると、両面がトロイダル面となるため、加工が困難となる。また、ディスクとギアとでは必要となる熱処理特性(浸炭硬化層深さ)が異なるため、完全一体型は製作が困難である。実際には前述したように、別体に製作し、浸炭処理してから溶接によって結合している。また、熱による変形や焼き戻りで硬さが低下するなどの問題を防ぐために溶接部とトロイダル面を離す必要がある。
【0006】
さらに、浸炭によって炭素濃度が上昇すると溶接割れ等が問題になり溶接での接合が困難になるので、溶接時は浸炭層を除去する必要があるが、硬化した浸炭層の切削は工具寿命の短命化などのコストアップの原因となる。
【0007】
この発明は、前記事情に着目してなされたもので、その目的とするところは、加工が容易で製作が簡単であるとともに軽量化を図ることができ、またディスクとギアにそれぞれ適した熱処理が容易に施すことができるハーフトロイダル型無段変速機を提供することにある。
【0008】
【課題を解決するための手段】
この発明は、前記目的を達成するために、請求項1は、互いに対向して配置された入力ディスクと出力ディスク間に介在するパワーローラの傾転により両ディスク間の変速比が無段階に変化するように構成されたハーフトロイダル型無段変速機において、前記出力ディスクは、背中合わせに配置された2枚の出力ディスクからなり、前記2枚の出力ディスクの外周側のみで、断面が略T字状のリング状であり、その外周部に歯部が設けられた動力伝達ギアの内周部を挟み込み、インロー嵌合により固定したことを特徴とする。
【0009】
請求項2は、請求項1の前記2枚の出力ディスクと動力伝達ギアとは、前記2枚の出力ディスクの外周側で、少なくとも回転方向に拘束されていることを特徴とする。
請求項3は、請求項2の前記2枚の出力ディスクと動力伝達ギアとは、前記2枚の出力ディスクの外周側に設けた締結手段により、回転方向に拘束されていることを特徴とする。
請求項4は、請求項1または2または3記載の前記出力ディスクは、トロイダル面と反対側の背面は、トロイダル面に沿うように、軸中心部に向かって徐々に大きく肉抜きされた凹部を有することを特徴とする。
【0010】
前記構成によれば、出力ディスクと動力伝達ギアとを別々に加工してそれぞれに最適な熱処理をした後、両者を結合できる。また、2枚のディスクはローディング力によって常に両側から互いに押し付けられているため、2枚のディスクと動力伝達ギアとは軸方向を拘束する必要がなく、請求項2に示すように、少なくとも回転方向に拘束されていればよい。
【0011】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
【0012】
図1及び図2は第1の実施形態を示し、図1はダブルキャビティ式ハーフトロイダル型無段変速機の縦断側面図、図2は同要部を拡大して示す縦断側面図である。図1に示すように、主軸としての動力伝達軸1にはフロント側キャビティ2とリヤ側キャビティ3が同軸的に配置されている。これらキャビティ2,3は、一対の入力ディスク4,5と一対の出力ディスク6,7とを有し、入力ディスク4と出力ディスク6との間及び入力ディスク5と出力ディスク7との間には摩擦によって動力を伝達するパワーローラがそれぞれ傾転自在に転接されている。
【0013】
フロント側キャビティ2の入力ディスク4は動力伝達軸1に対してボールスプライン10によって回転係合し、軸方向に移動可能になっている。また、リヤ側キャビティ3の入力ディスク5は動力伝達軸1に対して一体的に結合され、ローディングナット11によって抜け止めされている。さらに、フロント側キャビティ2の出力ディスク6及びリヤ側キャビティ3の出力ディスク7は動力伝達軸1に対して回転自在に嵌合された嵌合筒部13に対して背中合わせ状態で結合されている。
【0014】
さらに、動力伝達軸1の入力側には両入力ディスク4,5をパワーローラを介して両出力ディスク6,7に押圧するローディングカム14が嵌合されている。このローディングカム14とフロント側バリエータ2の入力ディスク4との間にはローラ15が設けられている。
【0015】
このローディングカム14を貫通し、入力側に突出する動力伝達軸1の端部には鍔部16が設けられ、この鍔部16と対向するローディングカム14には凹陥部17が設けられている。鍔部16と凹陥部17との間には環状空隙部18が設けられている。そして、この環状空隙部18の内部には両入力ディスク4,5を対応する両出力ディスク6,7に向けて予圧を付与する予圧機構19が設けられている。すなわち、予圧機構19は動力伝達軸1の軸方向に対して直角方向に配置されている。
【0016】
前記2枚の出力ディスク6,7は、図2に示すように構成されている。すなわち、出力ディスク6,7は背中合わせに配置され、トロイダル面6a,7aと反対側の背面6b,7bは軸心部に向かって徐々に大きく肉抜きされており、出力ディスク6,7の軽量化を図っている。
【0017】
また、出力ディスク6,7の背面6b,7bの間における外周部には動力伝達ギア20が介在されている。この動力伝達ギア20は断面が略T字状のリング状で、出力ディスク6,7の外周に嵌合する外周部20aにおける内周面と出力ディスク6,7の外周面とは芯出しのためにインロー嵌合(図中Xはインロー部を示す)されている。また、外周部20aにおける外周面には歯部21が設けられ、内周部20bは背面6b,7bの間に介在されている。
【0018】
さらに、出力ディスク6,7のトロイダル面6a,7aの外周縁部には段差によって肉薄部22が設けられている。この肉薄部22には互いに対向するとともに、動力伝達ギア20の内周部20bも貫通するボルト孔23が設けられている。このボルト孔23には一方の出力ディスク6側からボルト24が挿入され、このボルト24には他方の出力ディスク7側でナット25が螺合されている。そして、ナット25を締め付けることにより、ボルト24とナット25によって出力ディスク6,7と動力伝達ギア20が軸方向及び回転方向が拘束されている。なお、前記ボルト24とナット25との締結部は出力ディスク6,7の円周に例えば4個所、等間隔に設けられている。
【0019】
また、第1の実施形態においては、ボルト孔23にボルト24を挿入してナット25によって締め付け固定したが、ボルト孔23にリベットを挿入してリベット固定してもよい。
【0020】
図3は第1の実施形態の変形例1を示し、動力伝達ギア20の内周部20bを円板状に形成し、その内周縁部20cを肉厚にして出力ディスク6と7との背面6b,7b間に介在したものであり、第1の実施形態と同様の効果がある。
【0021】
図4は第1の実施形態の変形例2を示し、出力ディスク6と7の背面6b,7bにおける内周縁に互いに当接する凸部6c,7cを設けたものであり、第1の実施形態と同様の効果がある。
【0022】
図5は第2の実施形態を示し、第1の実施形態と同一構成部分は同一番号を付して説明を省略する。
【0023】
出力ディスク6,7の背面6b,7bにおける外周部には互いに対向するL字状の段差部27が形成されている。さらに、出力ディスク6,7の外周面にはスプライン溝28が設けられている。また、動力伝達ギア20の外周部20aにおける内側にはスプライン溝28と噛合するスプライン溝29が設けられている。従って、出力ディスク6,7と動力伝達ギア20が回転方向に拘束されている。なお、2枚の出力ディスク6,7はローディング力によって常に両側から互いに押し付けられているため、2枚の出力ディスク6,7と動力伝達ギア20とは軸方向を拘束する必要がなく、前述したように、少なくとも回転方向に拘束されていればよい。
【0024】
さらに、動力伝達ギア20の内周部20bには出力ディスク6,7の段差部27に係合する凸部30が設けられている。この凸部30の外周面と出力ディスク6,7の段差部27の内周面とは芯出しのためにインロー嵌合(図中Xはインロー部を示す)されている。
【0025】
図6は第2の実施形態の変形例1を示し、動力伝達ギア20の内周部20bを円板状に形成し、その内周縁部20cを肉厚にして出力ディスク6と7との背面6b,7b間に介在したものであり、第2の実施形態と同様の効果がある。
【0026】
図7は第2の実施形態の変形例2を示し、出力ディスク6と7の背面6b,7bにおける内周縁に互いに当接する凸部6c,7cを設けたものであり、第2の実施形態と同様の効果がある。
【0027】
図8は第3の実施形態を示し、第1の実施形態と同一構成部分は同一番号を付して説明を省略する。
【0028】
出力ディスク6,7の外周に嵌合する外周部20aにおける内周面と出力ディスク6,7の外周面とは芯出しのためにインロー嵌合(図中Xはインロー部を示す)されている。出力ディスク6,7の背面6b,7bにおける外周部には放射方向に互いに対向する凸状部31が形成されている。また、動力伝達ギア20の内周部20bにおける両側面には凸状部31と係合する凹状部32が設けられている。従って、出力ディスク6,7と動力伝達ギア20が回転方向に拘束されている。なお、2枚の出力ディスク6,7はローディング力によって常に両側から互いに押し付けられているため、2枚の出力ディスク6,7と動力伝達ギア20とは軸方向を拘束する必要がなく、前述したように、少なくとも回転方向に拘束されていればよい。
【0029】
図9は第3の実施形態の変形例を示し、動力伝達ギア20の内周部20bを円板状に形成し、その内周縁部20cを肉厚にして出力ディスク6と7との背面6b,7b間に介在したものであり、第3の実施形態と同様の効果がある。
【0030】
図10は第3の実施形態の変形例2を示し、出力ディスク6と7の背面6b,7bにおける内周縁に互いに当接する凸部6c,7cを設けたものであり、第3の実施形態と同様の効果がある。
【0031】
図11(a)(b)は第4の実施形態を示し、第1の実施形態と同一構成部分は同一番号を付して説明を省略する。
【0032】
出力ディスク6,7の外周に嵌合する外周部20aにおける内周面と出力ディスク6,7の外周面とは芯出しのためにインロー嵌合(図中Xはインロー部を示す)されている。さらに、出力ディスク6,7の外周面には少なくとも1個以上、例えば図11に示すように、円周方向に90°間隔に4個の係合突起33が設けられている。また、動力伝達ギア20の外周部20aにおける内側には係合突起33と係合する係合凹部34が設けられている。
【0033】
従って、出力ディスク6,7と動力伝達ギア20が回転方向に拘束されている。なお、2枚の出力ディスク6,7はローディング力によって常に両側から互いに押し付けられているため、2枚の出力ディスク6,7と動力伝達ギア20とは軸方向を拘束する必要がなく、前述したように、少なくとも回転方向に拘束されていればよい。
【0034】
図12(a)(b)は第4の実施形態の変形例1を示し、動力伝達ギア20の内周部20bを円板状に形成し、その内周縁部20cを肉厚にして出力ディスク6と7との背面6b,7b間に介在したものであり、第4の実施形態と同様の効果がある。
【0035】
図13は第4の実施形態の変形例2を示し、出力ディスク6と7の背面6b,7bにおける内周縁に互いに当接する凸部6c,7cを設けたものであり、第4の実施形態と同様の効果がある。
【0036】
図14は第5の実施形態を示し、第1の実施形態と同一構成部分は同一番号を付して説明を省略する。
【0037】
出力ディスク6,7の外周面におけるトロイダル面6a,7a側にはスプライン溝35が設けられている。また、動力伝達ギア20の外周部20aにおける外側内周面にはスプライン溝35と噛合するスプライン溝36が設けられている。従って、出力ディスク6,7と動力伝達ギア20が回転方向に拘束されている。なお、2枚の出力ディスク6,7はローディング力によって常に両側から互いに押し付けられているため、2枚の出力ディスク6,7と動力伝達ギア20とは軸方向を拘束する必要がなく、前述したように、少なくとも回転方向に拘束されていればよい。
【0038】
さらに、出力ディスク6,7の外周面における背面6b,7b側の外周面と動力伝達ギア20の外周部20aにおける内側内周面とは芯出しのためにインロー嵌合(図中Xはインロー部を示す)されている。従って、スプライン係合部とインロー部が隣り合って設けられている。
【0039】
図15は第5の実施形態の変形例1を示し、出力ディスク6と7の背面6b,7bにおける内周縁に互いに当接する凸部6c,7cを設けたものであり、第5の実施形態と同様の効果がある。
【0040】
図16は第5の実施形態の変形例2を示し、動力伝達ギア20の内周部20bを円板状に形成し、その内周縁部20cを肉厚にして出力ディスク6と7との背面6b,7b間に介在したものであり、第5の実施形態と同様の効果がある。
【0041】
【発明の効果】
以上説明したように、この発明によれば、背中合わせに配置された2枚の出力ディスクで動力伝達ギアを挟み込んで締結することにより、加工性に優れ、製作が簡単であるとともに軽量化を図ることができる。
【0042】
また、一般にディスクはトラクション面の転がり寿命と耐疲労割れ寿命を向上させるために、通常よりも深く浸炭され、動力伝達ギアは一般に柔らかい状態で表面のみを硬くすると歯部が折損に対して強い特性を示すが、従来のように一体ではギアの深部まで硬くなってしまい、衝撃入力などに対して弱くなってしまうが、この発明は、ディスクとギアが別体であるため、ディスクとギアにそれぞれ適した熱処理が容易に施すことができるという効果がある。
【図面の簡単な説明】
【図1】この発明の第1の実施形態を示すハーフトロイダル型無段変速機の縦断側面図。
【図2】同実施形態の出力ディスクと動力伝達ギアの結合構造を示す縦断側面図。
【図3】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例1を示す縦断側面図。
【図4】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例2を示す縦断側面図。
【図5】この発明の第2の実施形態を示す出力ディスクと動力伝達ギアの結合構造を示す縦断側面図。
【図6】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例1を示す縦断側面図。
【図7】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例2を示す縦断側面図。
【図8】この発明の第3の実施形態を示す出力ディスクと動力伝達ギアの結合構造を示す縦断側面図。
【図9】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例1を示す縦断側面図。
【図10】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例2を示す縦断側面図。
【図11】この発明の第4の実施形態を示す出力ディスクと動力伝達ギアの結合構造を示し、(a)は縦断側面図、(b)は側面図。
【図12】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例1を示し、(a)は縦断側面図、(b)は側面図。
【図13】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例2を示し、(a)は縦断側面図、(b)は側面図。
【図14】この発明の第5の実施形態を示す出力ディスクと動力伝達ギアの結合構造を示す縦断側面図。
【図15】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例1を示す縦断側面図。
【図16】同実施形態の出力ディスクと動力伝達ギアの結合構造の変形例2を示す縦断側面図。
【符号の説明】
4,5…入力ディスク
6,7…出力ディスク
20…動力伝達ギア
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a half-toroidal continuously variable transmission used as a transmission for an automobile or a transmission for various industrial machines.
[0002]
[Prior art]
In recent years, toroidal continuously variable transmissions have been used as transmissions for automobiles or as transmissions for various industrial machines. In this toroidal type continuously variable transmission, for example, as shown in Japanese Patent Laid-Open No. 11-63139, two pairs of disks are provided, and these two sets of disks are arranged along the axial direction and are different. A set of mutually adjacent output disks is integrated. Further, a power transmission gear is fixed to the outer peripheral edge portion of the integrated output disk.
[0003]
The output disk is carburized so as to increase the thickness of the layer of carburized structure, gears carburized so that the thickness of the layer of carburized structure is reduced, which was integrated by welding the output disc and the gear is there.
[0004]
According to the said structure, the length of the axial direction of a variator can be shortened by integrating output disks. Further, since the loading force acting on the output disk is offset, there is an advantage that the thickness of the disk can be reduced.
[0005]
[Problems to be solved by the invention]
However, when the output disks are integrated with each other, both surfaces become toroidal surfaces, which makes processing difficult. In addition, since the required heat treatment characteristics (carburized hardened layer depth) are different between the disk and the gear, it is difficult to manufacture a completely integrated type. Actually, as described above, they are manufactured separately, carburized, and then joined by welding. In addition, it is necessary to separate the welded portion from the toroidal surface in order to prevent problems such as a decrease in hardness due to heat deformation and tempering.
[0006]
In addition, if the carbon concentration increases due to carburization, welding cracks become a problem and joining by welding becomes difficult. Therefore, it is necessary to remove the carburized layer during welding, but cutting of the hardened carburized layer is a short tool life. It causes cost increase such as.
[0007]
The present invention has been made by paying attention to the above circumstances, and the object of the present invention is that it is easy to process and easy to manufacture, and can be reduced in weight. An object of the present invention is to provide a half-toroidal continuously variable transmission that can be easily applied.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in claim 1, the transmission gear ratio between the two disks is steplessly changed by the tilting of the power roller interposed between the input disk and the output disk arranged opposite to each other. In the half-toroidal continuously variable transmission configured as described above, the output disk is composed of two output disks arranged back to back, and the cross section is substantially T-shaped only on the outer peripheral side of the two output disks. a Jo ring-shaped, seen write sandwich the inner peripheral portion of the power transmission gear teeth is provided on the outer periphery thereof, characterized by being fixed by spigot fitting.
[0009]
A second aspect of the present invention is characterized in that the two output disks and the power transmission gear of the first aspect are constrained at least in the rotational direction on the outer peripheral side of the two output disks .
According to a third aspect of the present invention, the two output disks and the power transmission gear of the second aspect are constrained in a rotational direction by fastening means provided on an outer peripheral side of the two output disks. .
According to a fourth aspect of the present invention, in the output disk according to the first, second, or third aspect, the rear surface opposite to the toroidal surface has a recessed portion that is gradually thickened toward the axial center portion along the toroidal surface. It is characterized by having.
[0010]
According to the said structure, after processing an output disk and a power transmission gear separately and performing the optimal heat processing for each, both can be couple | bonded. Further, since the two discs are always pressed against each other from both sides by the loading force, the two discs and the power transmission gear need not be constrained in the axial direction. As long as it is bound to
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 and 2 show a first embodiment, FIG. 1 is a vertical side view of a double cavity half-toroidal continuously variable transmission, and FIG. 2 is an enlarged vertical side view of the main part. As shown in FIG. 1, a front side cavity 2 and a rear side cavity 3 are coaxially arranged on a power transmission shaft 1 as a main shaft. These cavities 2, 3 have a pair of input disks 4, 5 and a pair of output disks 6, 7, and between the input disk 4 and the output disk 6 and between the input disk 5 and the output disk 7. power low La which transmits power are respectively tilted freely rolling contact by friction.
[0013]
The input disk 4 of the front cavity 2 is rotationally engaged with the power transmission shaft 1 by a ball spline 10 and is movable in the axial direction. Further, the input disk 5 of the rear side cavity 3 is integrally coupled to the power transmission shaft 1 and is prevented from coming off by a loading nut 11. Further, the output disk 6 of the front side cavity 2 and the output disk 7 of the rear side cavity 3 are coupled back-to-back to a fitting cylinder portion 13 that is rotatably fitted to the power transmission shaft 1.
[0014]
Further, the input side of the power transmission shaft 1 has a loading cam 14 is fitted to press the two output disks 6 and 7 via the two input disks 4, 5 power low la. A roller 15 is provided between the loading cam 14 and the input disk 4 of the front side variator 2.
[0015]
A flange 16 is provided at the end of the power transmission shaft 1 that passes through the loading cam 14 and protrudes toward the input side, and a recess 17 is provided in the loading cam 14 that faces the flange 16. An annular space 18 is provided between the flange 16 and the recessed portion 17. In addition, a preload mechanism 19 is provided in the annular gap 18 to apply a preload to the input disks 4 and 7 corresponding to the input disks 4 and 5. That is, the preload mechanism 19 is disposed in a direction perpendicular to the axial direction of the power transmission shaft 1.
[0016]
The two output disks 6 and 7 are configured as shown in FIG. That is, the output disks 6 and 7 are arranged back to back, and the back surfaces 6b and 7b on the opposite side of the toroidal surfaces 6a and 7a are gradually hollowed out toward the axial center, thereby reducing the weight of the output disks 6 and 7. I am trying.
[0017]
Further, a power transmission gear 20 is interposed on the outer periphery between the back surfaces 6b and 7b of the output disks 6 and 7. The power transmission gear 20 has a ring shape with a substantially T-shaped cross section, and the inner peripheral surface of the outer peripheral portion 20a fitted to the outer periphery of the output disks 6 and 7 and the outer peripheral surface of the output disks 6 and 7 are for centering. Inlay fitting (X in the figure indicates the inlay portion). Moreover, the tooth | gear part 21 is provided in the outer peripheral surface in the outer peripheral part 20a, and the inner peripheral part 20b is interposed between the back surfaces 6b and 7b.
[0018]
Further, a thin portion 22 is provided at the outer peripheral edge portion of the toroidal surfaces 6a, 7a of the output disks 6, 7 by a step. The thin portion 22 is provided with bolt holes 23 that face each other and also penetrate the inner peripheral portion 20 b of the power transmission gear 20. Bolts 24 are inserted into the bolt holes 23 from one output disk 6 side, and nuts 25 are screwed into the bolts 24 on the other output disk 7 side. By tightening the nut 25, the axial direction and the rotational direction of the output disks 6, 7 and the power transmission gear 20 are restricted by the bolt 24 and the nut 25. The fastening portions between the bolts 24 and the nuts 25 are provided at equal intervals, for example, at four places on the circumference of the output disks 6 and 7.
[0019]
Further, in the first embodiment, the bolt 24 is inserted into the bolt hole 23 and fastened and fixed by the nut 25, but a rivet may be inserted into the bolt hole 23 and fixed by rivet.
[0020]
FIG. 3 shows a first modified example of the first embodiment, in which the inner peripheral portion 20b of the power transmission gear 20 is formed in a disk shape, and the inner peripheral edge portion 20c is thickened so that the rear surfaces of the output disks 6 and 7 are shown. 6b and 7b, and has the same effect as the first embodiment.
[0021]
FIG. 4 shows a second modification of the first embodiment, in which convex portions 6c and 7c that are in contact with each other are provided on the inner peripheral edges of the rear surfaces 6b and 7b of the output disks 6 and 7, respectively. There is a similar effect.
[0022]
FIG. 5 shows a second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0023]
L-shaped stepped portions 27 facing each other are formed on the outer peripheral portions of the rear surfaces 6b and 7b of the output disks 6 and 7. Further, spline grooves 28 are provided on the outer peripheral surfaces of the output disks 6 and 7. A spline groove 29 that meshes with the spline groove 28 is provided on the inner side of the outer peripheral portion 20 a of the power transmission gear 20. Accordingly, the output disks 6 and 7 and the power transmission gear 20 are constrained in the rotational direction. Since the two output disks 6 and 7 are always pressed against each other by the loading force, the two output disks 6 and 7 and the power transmission gear 20 do not need to be constrained in the axial direction. As such, it is only necessary to be constrained in at least the rotational direction.
[0024]
Further, the inner peripheral portion 20 b of the power transmission gear 20 is provided with a convex portion 30 that engages with the step portion 27 of the output disks 6 and 7. The outer peripheral surface of the convex portion 30 and the inner peripheral surface of the stepped portion 27 of the output disks 6 and 7 are inlay-fitted (X in the figure indicates the inlay portion) for centering.
[0025]
FIG. 6 shows a first modification of the second embodiment, in which the inner peripheral portion 20b of the power transmission gear 20 is formed in a disc shape, and the inner peripheral edge portion 20c is thickened so that the back surface of the output disks 6 and 7 is shown. 6b and 7b, and has the same effect as the second embodiment.
[0026]
FIG. 7 shows a second modification of the second embodiment, in which convex portions 6c and 7c that abut against each other are provided on the inner peripheral edges of the back surfaces 6b and 7b of the output disks 6 and 7, respectively. There is a similar effect.
[0027]
FIG. 8 shows a third embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0028]
The inner peripheral surface of the outer peripheral portion 20a fitted to the outer periphery of the output disks 6 and 7 and the outer peripheral surface of the output disks 6 and 7 are inlay-fitted for alignment (X in the figure indicates the inlay portion). . Convex portions 31 that are opposite to each other in the radial direction are formed on the outer peripheral portions of the rear surfaces 6b and 7b of the output disks 6 and 7. In addition, concave portions 32 that engage with the convex portions 31 are provided on both side surfaces of the inner peripheral portion 20 b of the power transmission gear 20. Accordingly, the output disks 6 and 7 and the power transmission gear 20 are constrained in the rotational direction. Since the two output disks 6 and 7 are always pressed against each other by the loading force, the two output disks 6 and 7 and the power transmission gear 20 do not need to be constrained in the axial direction. As such, it is only necessary to be constrained in at least the rotational direction.
[0029]
FIG. 9 shows a first modification of the third embodiment, in which the inner peripheral portion 20b of the power transmission gear 20 is formed in a disk shape, the inner peripheral edge portion 20c is thickened, and the rear surfaces of the output disks 6 and 7 are shown. 6b and 7b, and has the same effect as the third embodiment.
[0030]
FIG. 10 shows a second modification of the third embodiment, in which convex portions 6c and 7c that are in contact with each other are provided on the inner peripheral edges of the back surfaces 6b and 7b of the output disks 6 and 7, respectively. There is a similar effect.
[0031]
11 (a) and 11 (b) show a fourth embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0032]
The inner peripheral surface of the outer peripheral portion 20a fitted to the outer periphery of the output disks 6 and 7 and the outer peripheral surface of the output disks 6 and 7 are inlay-fitted for alignment (X in the figure indicates the inlay portion). . Further, at least one, for example, as shown in FIG. 11, four engaging projections 33 are provided on the outer peripheral surfaces of the output disks 6 and 7 at intervals of 90 ° in the circumferential direction. An engagement recess 34 that engages with the engagement protrusion 33 is provided inside the outer peripheral portion 20 a of the power transmission gear 20.
[0033]
Accordingly, the output disks 6 and 7 and the power transmission gear 20 are constrained in the rotational direction. Since the two output disks 6 and 7 are always pressed against each other by the loading force, the two output disks 6 and 7 and the power transmission gear 20 do not need to be constrained in the axial direction. As such, it is only necessary to be constrained in at least the rotational direction.
[0034]
12 (a) and 12 (b) show a first modification of the fourth embodiment, in which the inner peripheral portion 20b of the power transmission gear 20 is formed in a disk shape, and the inner peripheral edge portion 20c is thickened to produce an output disc. 6 and 7 are interposed between the rear surfaces 6b and 7b, and have the same effects as in the fourth embodiment.
[0035]
FIG. 13 shows a second modification of the fourth embodiment, in which convex portions 6c and 7c that abut against each other are provided on the inner peripheral edges of the back surfaces 6b and 7b of the output disks 6 and 7, respectively. There is a similar effect.
[0036]
FIG. 14 shows a fifth embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0037]
Spline grooves 35 are provided on the toroidal surfaces 6 a and 7 a side on the outer peripheral surfaces of the output disks 6 and 7. A spline groove 36 that meshes with the spline groove 35 is provided on the outer inner peripheral surface of the outer peripheral portion 20 a of the power transmission gear 20. Accordingly, the output disks 6 and 7 and the power transmission gear 20 are constrained in the rotational direction. Since the two output disks 6 and 7 are always pressed against each other by the loading force, the two output disks 6 and 7 and the power transmission gear 20 do not need to be constrained in the axial direction. As such, it is only necessary to be constrained in at least the rotational direction.
[0038]
Further, the outer peripheral surface of the rear surfaces 6b and 7b on the outer peripheral surface of the output disks 6 and 7 and the inner inner peripheral surface of the outer peripheral portion 20a of the power transmission gear 20 are fitted with a spigot for alignment (X in FIG. Is shown). Therefore, the spline engaging portion and the spigot portion are provided adjacent to each other.
[0039]
FIG. 15 shows a first modification of the fifth embodiment, in which convex portions 6c and 7c that abut against each other on the inner peripheral edges of the back surfaces 6b and 7b of the output disks 6 and 7 are provided. There is a similar effect.
[0040]
FIG. 16 shows a second modification of the fifth embodiment, in which the inner peripheral portion 20b of the power transmission gear 20 is formed in a disc shape, the inner peripheral edge portion 20c is thickened, and the back surface of the output disks 6 and 7 It is interposed between 6b and 7b and has the same effect as the fifth embodiment.
[0041]
【The invention's effect】
As described above, according to the present invention, the power transmission gear is sandwiched and fastened by the two output disks arranged back to back, so that it is excellent in workability, easy to manufacture and lightweight. Can do.
[0042]
Also, in general, the disk is carburized deeper than usual to improve the rolling life and fatigue crack life of the traction surface, and if the power transmission gear is generally soft and only the surface is hardened, the teeth are resistant to breakage. However, as in the conventional case, it becomes hard to the deep part of the gear and becomes weak against shock input etc., but this invention is separate from the disk and the gear, respectively. There is an effect that a suitable heat treatment can be easily performed.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a half-toroidal continuously variable transmission showing a first embodiment of the present invention.
FIG. 2 is a longitudinal side view showing a coupling structure of an output disk and a power transmission gear according to the embodiment.
FIG. 3 is a longitudinal side view showing a first modification of the coupling structure of the output disk and the power transmission gear of the embodiment.
FIG. 4 is a longitudinal side view showing a second modification of the coupling structure of the output disk and the power transmission gear according to the embodiment;
FIG. 5 is a longitudinal side view showing a coupling structure of an output disk and a power transmission gear according to a second embodiment of the present invention.
6 is a longitudinal side view showing a first modification of the coupling structure of the output disk and the power transmission gear of the embodiment. FIG.
7 is a longitudinal side view showing a second modification of the coupling structure of the output disk and the power transmission gear of the embodiment; FIG.
FIG. 8 is a longitudinal side view showing a coupling structure of an output disk and a power transmission gear according to a third embodiment of the present invention.
FIG. 9 is a longitudinal side view showing a first modification of the output disk / power transmission gear coupling structure according to the embodiment;
FIG. 10 is a vertical side view showing a second modification of the coupling structure of the output disk and the power transmission gear according to the embodiment;
11A and 11B show a coupling structure of an output disk and a power transmission gear according to a fourth embodiment of the present invention, where FIG. 11A is a longitudinal side view, and FIG. 11B is a side view.
12A and 12B show a first modification of the coupling structure of the output disk and the power transmission gear of the embodiment, wherein FIG. 12A is a longitudinal side view, and FIG. 12B is a side view.
13A and 13B show a second modification of the coupling structure of the output disk and the power transmission gear of the embodiment, wherein FIG. 13A is a longitudinal side view, and FIG. 13B is a side view.
FIG. 14 is a longitudinal side view showing a coupling structure of an output disk and a power transmission gear according to a fifth embodiment of the present invention.
FIG. 15 is a longitudinal side view showing a first modification of the output disk / power transmission gear coupling structure of the embodiment;
FIG. 16 is a longitudinal side view showing a second modification of the coupling structure of the output disk and the power transmission gear according to the embodiment;
[Explanation of symbols]
4, 5 ... Input disc 6, 7 ... Output disc 20 ... Power transmission gear

Claims (4)

互いに対向して配置された入力ディスクと出力ディスク間に介在するパワーローラの傾転により両ディスク間の変速比が無段階に変化するように構成されたハーフトロイダル型無段変速機において、
前記出力ディスクは、背中合わせに配置された2枚の出力ディスクからなり、前記2枚の出力ディスクの外周側のみで、断面が略T字状のリング状であり、その外周部に歯部が設けられた動力伝達ギアの内周部を挟み込み、インロー嵌合により固定したことを特徴とするハーフトロイダル型無段変速機。
In a half-toroidal continuously variable transmission configured such that the gear ratio between the two disks changes steplessly due to the tilt of the power roller interposed between the input disk and the output disk arranged opposite to each other.
The output disk is composed of two output disks arranged back to back, and has a ring shape with a substantially T-shaped cross section only on the outer peripheral side of the two output disks, and a tooth part is provided on the outer peripheral part. was seen write sandwiching the inner peripheral portion of the power transmission gears, toroidal type continuously variable transmission, characterized in that fixed by spigot fitting.
前記2枚の出力ディスクと動力伝達ギアとは、前記2枚の出力ディスクの外周側で、少なくとも回転方向に拘束されていることを特徴とする請求項1記載のハーフトロイダル型無段変速機。2. The half-toroidal continuously variable transmission according to claim 1, wherein the two output disks and the power transmission gear are constrained at least in a rotational direction on an outer peripheral side of the two output disks . 前記2枚の出力ディスクと動力伝達ギアとは、前記2枚の出力ディスクの外周側に設けた締結手段により、回転方向に拘束されていることを特徴とする請求項2記載のハーフトロイダル型無段変速機。3. The half toroidal type non-rotating device according to claim 2, wherein the two output disks and the power transmission gear are constrained in a rotating direction by fastening means provided on an outer peripheral side of the two output disks. Step transmission. 前記出力ディスクは、トロイダル面と反対側の背面は、トロイダル面に沿うように、軸中心部に向かって徐々に大きく肉抜きされた凹部を有することを特徴とする請求項1または2または3記載のハーフトロイダル型無段変速機。 4. The output disk according to claim 1, wherein the back surface opposite to the toroidal surface has a concave portion that is gradually thickened toward the axial center portion along the toroidal surface. Half toroidal type continuously variable transmission.
JP2000234380A 2000-08-02 2000-08-02 Half toroidal continuously variable transmission Expired - Fee Related JP4254029B2 (en)

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