The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2004
Filed:
Jul. 29, 2002
Tsuyoshi Sugihara, Hiroshima, JP;
Takanobu Kamura, Hiroshima, JP;
Minoru Sunada, Hiroshima, JP;
Yoshio Fujii, Hiroshima, JP;
Shoji Nanba, Hiroshima, JP;
Toshiharu Ikeda, Hiroshima, JP;
Gunji Yoshii, Hiroshima, JP;
Tsutomu Naganuma, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
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 2×1 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.