To provide a vehicular seat structure capable of securing hold property and dissolving discomfort felt by an occupant.SOLUTION: A seat 1 comprises a seat cushion 10 and a seat back 20, the seat back 20 comprises: an upper thoracic spine support part 20a for supporting a portion a corresponding to at least an upper thoracic spine lower end (T7) of a seated occupant D; and a lower thoracic spine support part 20b for supporting a portion b corresponding to a lower thoracic spine of the seated occupant D on a front side of the upper thoracic spine support part 20a. A spring constant kb of the lower thoracic spine support part 20b is set to become lower than a spring constant ka of the upper thoracic spine support part 20a, so that, the lower thoracic spine support part 20b is movable rearward largely relative to the upper thoracic spine support part 20a and the upper thoracic spine lower end of the occupant D rotates forward, when inertia force going rearward acts the occupant D.SELECTED DRAWING: Figure 7

    【課題】ホールド性を確保しつつ乗員の違和感を解消することができる車両用シート構造を提供する。【解決手段】シートクッション10と、シートバック20とを備えたシート1において、シートバック20が、少なくとも着座乗員Dの上部胸椎下端(T7)に対応した部位aを支持する上部胸椎支持部20aと、上部胸椎支持部20aよりも前側で且つ着座乗員Dの下部胸椎に対応した部位bを支持する下部胸椎支持部20bとを有し、着座乗員Dに対して後方へ向かう慣性力が作用したとき、下部胸椎支持部20bが、上部胸椎支持部20aよりも大きく後方移動可能で且つ着座乗員Dの上部胸椎下端が前方回動するように下部胸椎支持部20bのばね定数kbが、上部胸椎支持部20aのばね定数kaよりも低く設定されている。【選択図】 図7


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    Title :

    VEHICULAR SEAT STRUCTURE


    Additional title:

    車両用シート構造


    Contributors:

    Publication date :

    2019-10-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / A47C Stühle , CHAIRS



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