To enable a rider to easily put his/her foot onto the ground surface when a motorized bicycle stops, and to greatly increase the flexural rigidity of a single frame.SOLUTION: A vehicle body frame structure of a motorized bicycle includes a head tube 2 to which an operation handle 7 is attached, a down tube 3 extending obliquely downward from the head tube 2, a curved part 4 provided in a lower end of the down tube 3, and a rear tube 5 extending obliquely upward from the curved part 4. The down tube 3, the curved part 4, and the rear tube 5 constitutes a single frame formed of a curved pipe of the same metal material. A reinforcement bar 19 laterally protruding from the curved part 4 is passed through a through hole 41 of the curved part 4, and is fixed to a rim of the through hole 41.SELECTED DRAWING: Figure 4

    【課題】原動機付自転車の停止時に運転者が容易に地面に足を着けることを可能にすると共に、シングルフレームの曲げ剛性を非常に高めることができる。【解決手段】原動機付自転車の車体フレーム構造であって、操作ハンドル7が取り付けられるヘッドパイプ2と、ヘッドパイプ2から斜め下方に延設されたダウンチューブ3と、ダウンチューブ3の下端に設けられた曲がり部4と、曲がり部4から斜め上方に延設されたリアチューブ5を備え、ダウンチューブ3と曲がり部4とリアチューブ5が同一金属材の曲げパイプで形成されたシングルフレームであり、曲がり部4から左右方向に突出する補強棒19が曲がり部4の貫通穴41に貫通され、貫通穴41の周縁に固定されている。【選択図】図4


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    Title :

    VEHICLE BODY FRAME STRUCTURE AND MOTORIZED BICYCLE


    Additional title:

    車体フレーム構造及び原動機付自転車


    Contributors:

    Publication date :

    2024-07-31


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES / B62J Fahrrad- oder Motorradsättel oder -sitze , CYCLE SADDLES OR SEATS



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