The new "N-Box"

The new "N-Box" light car, which Honda Motor Co Ltd released Sept 1, 2017, comes with a newly-developed platform to reduce body frame weight and deal with collisions in all directions (front, side and rear collisions).

Honda used many 780MPa-class and stronger high-tensile steel plates for the body frame of the new N-Box and reduced the mass of the body frame by about 15%, compared with the previous model (Body Frame of Honda 'N-Box' Becomes 15% Lighter in Weight). In addition, the company reviewed the structure of the frame to deal with collisions in all directions.

The platform of the previous model absorbs collision energy input to the front frame by dispersing it mainly to the floor frame and side sills. On the other hand, for the new platform, a front frame with a truss structure was newly formed on the front side of the floor. By transferring the collision energy to the floor cross member and side sills, it became possible to more efficiently absorb the energy, compared with the previous model, Honda said.

Differences in frame structure between the new and previous models

Because of the installation of the front frame with the truss structure, the rear floor frame in the center of the vehicle was eliminated. Furthermore, a 1.2GPa-class high-tensile steel plate was employed for the front floor cross member to improve strength.

In addition to the increased use of 780MPa-class and stronger high-tensile steel plates, such a review of the frame structure contributed to reducing platform weight and improving collision safety, Honda said.