To provide a bicycle frame structure capable of securing required product-accuracy, securing a high yield, and reducing the manufacturing cost.SOLUTION: A bicycle frame structure has a down-tube 3 bent in a V-shape in a side view, the down-tube including: an upward extension portion 31 extending obliquely upward toward a head pipe 2; and a horizontal portion 33 extending substantially horizontally rearward from a bent portion 32 located near a position of a driver's foot and bent from a lower end of the upward extension portion 31. The down-tube 3 is composed of a single frame formed by joining a pair of right and left half bodies 34, 35 to each other in a width direction. An engagement holding stay 38 of an ECU 9 mounted in the down-tube 3 is provided inside the upward extension portion 31. The upward extension portion 31 is provided with an opening 353 for mounting the ECU 9 therethrough.SELECTED DRAWING: Figure 6

    【課題】必要な製品精度の確保、高い歩留まりの確保、製造コストの低減を図ることができる自転車用フレーム構造を提供する。【解決手段】ヘッドパイプ2に向かって斜め上方に延びる上方延設部31が形成され、上方延設部31の下端から曲がる運転者の足の位置付近に位置する曲がり部32から後方に向かって略水平で延びる水平部33が設けられている側面視く字状に屈曲されたダウンチューブ3を有し、ダウンチューブ3が左右一対の半体34、35を幅方向に相互に接合して形成されたシングルフレームで構成され、上方延設部31の内部にダウンチューブ3に内装されるECU9の係合保持ステー38が設けられ、上方延設部31にECU9を内装するための開口部353が設けられている自転車用フレーム構造。【選択図】図6


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    Title :

    BICYCLE FRAME STRUCTURE


    Additional title:

    自転車用フレーム構造


    Contributors:

    Publication date :

    2025-04-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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