PROBLEM TO BE SOLVED: To form a vehicle body frame with a carbon material, and secure sufficient rigidity even when outer diameter of respective tube is equal to thickness of the vehicle body frame of a classic type.SOLUTION: A vehicle body frame comprises: a top tube 110 which is formed into a circular pipe shape having same outer diameter from a front end to a rear end, whose inner diameter becomes gradually smaller as going to the front end from the rear end, and thickness of the front end part is relatively thick to that of the rear end part; a bottom tube 120 which is formed into a circular pipe shape having outer diameter equal to that of the top tube 110, and whose inner diameter becomes gradually smaller as going to the front end from the rear end, and thickness of the front end part is relatively thick to that of the rear end part; and a seat tube 130 which is formed into a circular pipe shape whose outer diameter is equal to that of the top tube 110, and whose inner diameter gradually becomes smaller as going to a lower end from an upper end, and thickness of the lower end part which is coupled with the bottom tube 120 is relatively thick to thickness of the upper end part which is coupled with the top tube 110.

    【課題】自転車のボディーフレームをカーボン素材で形成し、各チューブの外径をクラシックタイプの自転車のボディーフレームの太さとしても十分な剛性を確保する。【解決手段】前端から後端まで同一外径を有する円形のパイプ形状であり、後端から前端に向かうほど内径を漸次縮小し、前端部分の肉厚が後端部分の肉厚に比べて相対的に厚いトップチューブ110と;前記トップチューブ110と同一の外径を有する円形のパイプ形状であり、後端から前端に向かうほど内径を漸次縮小し、前端部分の肉厚が後端部分の肉厚に比べて相対的に厚いボトムチューブ120と;前記トップチューブ110と同一の外径を有する円形のパイプ形状であり、上端から下端に向かうほど内径を漸次縮小し、前記ボトムチューブ120と連結される下端部分の肉厚が前記トップチューブ110と連結される上端部分の肉厚に比べて相対的に厚いシートチューブ130とから構成する。【選択図】図3


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    Title :

    VEHICLE BODY FRAME


    Additional title:

    自転車のボディーフレーム


    Contributors:
    WON PARK DONG (author) / JE CHOI UNG (author)

    Publication date :

    2015-12-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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