PROBLEM TO BE SOLVED: To propose a body frame structure of a motorcycle capable of more efficiently suppressing a variance in a body behavior by upgrading rigidity of a body frame.SOLUTION: In a body frame structure 51, bridges 21R and 21L include first joints that are joined with main frames 15R and 15L respectively, and second joints 56R and 56L that each are joined with a down tube 17. The second joints 56R and 56L include first joint flanges 63R and 63L respectively that are joined with the right or left flank of the down tube 17 through welding, second joint flanges that each are joined with the upper surface of the down tube 17 through welding, and third joint flanges 65R and 65L respectively that adjoin the first joint flanges 63R and 63L and second joint flanges, are separated from the down tube 17, and are joined with each other through welding in order to unite the pair of right and left bridges 21R and 21L.SELECTED DRAWING: Figure 5

    【課題】車体フレームの剛性をより向上させ、車体挙動の変動をより抑制可能な自動二輪車の車体フレーム構造を提案する。【解決手段】車体フレーム構造51において、ブリッジ21L、21Rは、メインフレーム15L、15Rに接合される第一接合部と、ダウンチューブ17に接合される第二接合部56L、56Rと、を有している。第二接合部56L、56Rは、ダウンチューブ17の右側面または左側面に溶接で接合される第一接合鍔部63L、63Rと、ダウンチューブ17の上面に溶接で接合される第二接合鍔部と、第一接合鍔部63L、63Rおよび第二接合鍔部に連接し、ダウンチューブ17から離間し、かつ互いに溶接で接合されて左右一対のブリッジ21L、21Rを一体化させる第三接合鍔部65L、65Rと、を有している。【選択図】図5


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    Title :

    BODY FRAME STRUCTURE OF MOTORCYCLE


    Additional title:

    自動二輪車の車体フレーム構造


    Contributors:

    Publication date :

    2018-08-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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