Mazda Motor Corporation

Minoru Sunada

Kazuki Yamauchi

Tsuyoshi Sugihara

Hiroshi Sogabe

Takanobu Kamura

Toshiharu Ikeda

Yoshio Fujii

Shunsuke Hirai

Susumu Kuroda

Gunji Yoshii

Ryo Asahi

Shoji Nanba

Tsutomu Naganuma

There are provided a cowl provided to support a front windshield in an inclined state where a rear side of the front windshield is located at a higher level than a front side of the front windshield and forming a lower edge of an opening portion for arranging the front windshield and a bonnet provided in front of and above the cowl. An upper portion of the cowl comprises a first face portion to which the front windshield adheres and an inclined second face portion which extends obliquely rearwardly-and-downwardly from the first face portion, and a front end of the first face portion is positioned on a rearward side, in a vehicle longitudinal direction, of a rear end of the bonnet.

Front vehicle-body structure of vehicle

A floor is partitioned into a plurality of areas S to S by a floor tunnel portion , side frames , side sills , and cross members , and , and the rigidity of the floor panels of the areas S to S is adjusted by rigidity adjustment portions , and . These floor panels are set such that their natural frequency in a 2&times;1 mode, in which two antinodes are generated in the length direction of the automobile and one antinode is generated in the width direction of the automobile, is 240 to 260 Hz. Thus, a reduction in road noise due to automobile tire cavity resonance is achieved.

Automobile floor structure

Growing community of inventors

Aki-gun, Japan

Minoru Sunada