PROBLEM TO BE SOLVED: To provide a frame structure of a motorcycle, which comprises a joint member constituted of a taper-shaped forging, does not require swaging processing, avoids stress concentration by tilting a weld jointing face between a down tube and the joint member and secures balance between strength and rigidity.SOLUTION: The frame structure of a motorcycle comprises: a head pipe 12; a pair of left and right main frames 13; a pair of left and right frame legs 16; one down tube 17; one joint member 18; a pair of left and right lower tubes 19. The joint member 18 connecting the down tubes 17 to the lower tubes 19 is constituted of a forging 47, and a weld jointing face between the down tubes 17 and the joint member 18 is constituted in an inclined shape where the face rises rearward and upward on the midway from the front lower end toward the rear face of the down tube 17 while leaving a required planar part, in a side view of a vehicle body.

    【課題】ジョイント部材にテーパ形状を備えた鍛造品で構成し、スウェージング加工を不要としてダウンチューブとジョイント部材との溶接接合面を斜めとして応力集中を回避し、強度と剛性のバランスを確保した自動二輪車のフレーム構造を提供する。【解決手段】自動二輪車のフレーム構造は、ヘッドパイプ12と左右一対のメインフレーム13と、左右一対のフレームレッグ16と、1本のダウンチューブ17とジョイント部材18と左右一対のロアチューブ19とを備え、ダウンチューブ17とロアチューブ19とを接続するジョイント部材18は鍛造品47で構成され、ダウンチューブ17とジョイント部材18との溶接接合面が、車体側面視でダウンチューブ17の前面側下端からその後面に向って所要の平面部を残して途中から後上方に立ち上る傾斜形状に構成されることを特徴とするものである。【選択図】 図3


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    Title :

    FRAME STRUCTURE OF MOTORCYCLE


    Additional title:

    自動二輪車のフレーム構造


    Contributors:

    Publication date :

    2015-06-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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