To provide a lower vehicle body structure of an automobile capable of improving surface stiffness on an upper surface portion of a first seat mounting bracket, without impairing a function as a load transmission path for transmitting a side collision load from a vehicle side part.SOLUTION: A lower vehicle body structure of an automobile is equipped with a pair of right and left side sills 4, a floor panel 6, and a first seat mounting bracket 21 supporting a front seat. An upper surface portion 214 of the first seat mounting bracket 21 is composed of a mounting part 214a mounted with a front seat, an inclined part extended downward from an edge side on the outside in a vehicle width direction in the mounting part 214a, and a step-down 214c extended from the inclined part toward the side sills 4. On the step-down part 214c, a bead 214d is formed, which projects out toward an upper side of a vehicle and extends from the inclined part to the side sills 4 in the vehicle width direction.SELECTED DRAWING: Figure 6

    【課題】車両側方からの側突荷重を伝達する荷重伝達経路としての機能を損なうことなく、第1シート取付けブラケットの上面部における面剛性を向上できる自動車の下部車体構造を提供する。【解決手段】左右一対のサイドシル4と、フロアパネル6と、前席シートを支持する第1シート取付けブラケット21とを備えた自動車の下部車体構造であって、第1シート取付けブラケット21の上面部214が、前席シートが取付けられる取付け部分214aと、取付け部分214aにおける車幅方向外側の縁辺から下方へ延設された傾斜部分と、傾斜部分からサイドシル4へ向けて延設された段下げ部分214cとで構成され、段下げ部分214cに、車両上方へ向けて突出するとともに、傾斜部分からサイドシル4にかけて車幅方向に延びるビード214dが形成されたことを特徴とする。【選択図】図6


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    Title :

    LOWER VEHICLE BODY STRUCTURE OF AUTOMOBILE


    Additional title:

    自動車の下部車体構造


    Contributors:

    Publication date :

    2019-01-31


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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