To provide a toothed crown for a bicycle crank set, which is reduced in weight without deteriorating the structural resistance and structural strength.SOLUTION: An annular body 101 has a maximum axial thickness equal to the distance between two main planes which are parallel to each other and orthogonal to a reference plane R. The maximum axial thickness is formed at first angular portions 141, 142 of the annular body 101. The first angular portion 141 of the annular body 101 has a first lightening recess 181, 182 formed on the axially-outer surface. The first angular portion 141 extends circumferentially between two delimiting planes K, L which pass through the rotation axis O and are inclined with respect to the reference plane R on the axially-outer surface by a first angle within a range between about 21° and about 27° and by a second angle within a range between about 67° and about 73°, respectively, as measured angularly in the clockwise direction from the reference plane R.SELECTED DRAWING: Figure 2

    【課題】構造耐力や構造強度を損なうことなく重量減少させた、自転車クランクセットの歯付クラウンの提供。【解決手段】環状体101は、互いに平行かつ基準平面Rと直交する2つの主平面間の距離に等しい最大の軸方向厚さを有する。最大軸方向厚さは、環状体101の第1角度方向部位141,142に形成されている。環状体101の第1角度方向部位141は、軸方向外側表面に形成された第1軽量化凹所181,182を有し、第1角度方向部位141が、回転軸心Oを貫通し且つ基準平面Rに対して軸方向外側表面上で、基準平面Rから角度方向に時計回りで約21°以上、約27°以下の範囲内の第1角度で、約67°以上、約73°以下の範囲内の第2角度で、傾いた2つの境界平面K,L間で周方向に延在することを特徴とする。【選択図】図2


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    Title :

    TOOTHED CROWN FOR BICYCLE CRANK SET


    Additional title:

    自転車のクランクセットの歯付きクラウン


    Contributors:

    Publication date :

    2019-03-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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