To provide a vehicle body frame structure of a saddle-riding type vehicle, having a down tube divided into two segments from a head pipe, capable of suppressing stress concentration onto a vehicle body frame while achieving weight reduction in a vehicle body.SOLUTION: The vehicle body frame structure for a motor cycle, having a down tube 22 divided into right and left segments from a head pipe 20, is constructed so that an under gusset 41 which has a thickness larger than a main frame 21 and which is in a U-shaped cross section is divided into right and left segments to form a pair under the down tube 22 and so that a cross gusset 45 connecting the pair of right and left under gussets 41 is provided between the pair of right and left under gussets 41 in the vehicle width direction.SELECTED DRAWING: Figure 2

    【課題】ヘッドパイプから2本に分かれるダウンチューブを持つ鞍乗り型車両の車体フレーム構造において、車体の軽量化を図りつつ車体フレームへの応力集中を抑制する。【解決手段】ヘッドパイプ20から左右2本に分かれるダウンチューブ22を持つ自動二輪車の車体フレーム構造において、ダウンチューブ22の下部に、メインフレーム21よりも板厚の厚い断面U字状のアンダーガセット41を左側と右側とに分割して一対に設け、左右一対のアンダーガセット41の車幅方向間に、左右一対のアンダーガセット41をつなぐクロスガセット45を設けた。【選択図】図2


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    Title :

    VEHICLE BODY FRAME STRUCTURE FOR SADDLE-RIDING TYPE VEHICLE


    Additional title:

    鞍乗り型車両の車体フレーム構造


    Contributors:

    Publication date :

    2018-12-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62K Fahrräder , CYCLES



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