UNDER-FLOOR FRAME SYSTEM OF VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide an under-floor frame system of a vehicle.SOLUTION: An under-floor frame system of a vehicle includes: a main frame formed of a carbon fiber composite material and forming a closed quadrangle as a quadrangular frame shape; a center cross member connecting intermediate portions of both side members of the main frame across the vehicle width direction; a front cross member connecting front portions of both side members of the main frame across the vehicle width direction; a rear cross member connecting rear portions of the side members; and a center tunnel member extended in the length direction of the vehicle to pass through an upper space of the center cross member and connecting the front cross member and the rear cross member.