Body framework construction

A body framework construction, comprising:

• a rear seat cross member, extending in a transverse direction of a vehicle, in a rear part of a body in a lower part of a passenger compartment;
• a dash cross member upper, extending in the transverse direction, in a front part of the passenger compartment;
• a backbone, configured into a thin, long shape having a closed cross section, and extending in a longitudinal direction of the vehicle, wherein a front end portion of the backbone is connected to the dash cross member upper via a gusset, and a rear end portion of the backbone is joined to the rear seat cross member;
• and
• backbone side panels, joined to both sides of the backbone in the transverse direction, respectively, so as to make up a floor part of the passenger compartment,
• wherein the gusset is deformed more easily than the backbone relative to a force from a front of the vehicle.

A body framework construction, comprising:

• a rear seat cross member, extending in a transverse direction of a vehicle, in a rear part of a body in a lower part of a passenger compartment;
• a dash cross member upper, extending in the transverse direction, in a front part of the passenger compartment;
• and
• a backbone, configured into a thin, long shape having a closed cross section, and extending in a longitudinal direction of the vehicle, wherein a front end portion of the backbone is connected to the dash cross member upper via a gusset, and a rear end portion of the backbone is joined to the rear seat cross member,
• wherein the gusset is deformed more easily than the backbone relative to a force from a front of the vehicle, and wherein
• the dash cross member upper, the backbone and the rear seat cross member are extruded members each having a cross-sectional shape which is continuous in the longitudinal direction, and
• the gusset includes a bent plate member, and the gusset includes integrally:
• a horizontal portion that extends in the longitudinal direction and that is joined to the front end portion of the backbone;
• a sloping portion that extends obliquely upwards from a front end portion of the horizontal portion;
• and a vertical portion that extends upwards from a front end portion of the sloping portion and that is joined to the dash cross member.