Mazda Motor Corporation

Tsuyoshi Sugihara

Shigeaki Watanabe

Sakayu Terada

Miho Kowaki

Akira Iyoshi

Kohya Nakagawa

Kuniaki Nagao

Osamu Kurogi

Takanobu Kamura

Akinori Utsunomiya

Shigefumi Hirabayashi

Masaru Chikita

Toshiharu Ikeda

Tatsumi Makimae

Yoshio Fujii

Kazumoto Tanaka

Chie Fukuhara

Eiji Murasawa

Kenji Murase

Naoko Yorozu

Gunji Yoshii

Minoru Sunada

Seiichi Nakabayashi

Kouya Nakagawa

Shoji Nanba

Tsutomu Naganuma

Hidenori Ishiide

In a vehicle-body structure of a vehicle, where suspension forming members are attached to a vehicle body, there are provided a first face portion, through which the suspension forming member extends, a second face portion provided to face to the first face portion, and a support member provided between the first face portion and the second face portion and supporting the suspension forming members, and the support member is joined to said second face portion via a reinforcing member which is formed integrally with the support member or formed separately from the support member. Accordingly, vibrations of the support member can be properly restrained.

Vehicle-body structure of vehicle and manufacturing method of the same

In a vehicle-body structure of a vehicle which comprises at least one vehicle-body forming member forming a closed-section portion continuously in a specified direction, a partition member extending in the specified direction and partitioning an inside of the closed-section portion, and a bulkhead provided in the closed-section portion and joined to the vehicle-body forming member, the bulkhead is joined to an inner face of the vehicle-body forming member at specified positions which are located on both sides of the partition member, and the bulkhead is joined to a specified portion of the partition member which is located in the vicinity of opening portions formed at the partition member or to an end portion of the partition member in the specified direction.

In a vehicle-body structure of a vehicle which comprises vehicle-body forming members forming a closed-section portion and having a dent portion which dents toward an inside of the closed-section portion, and a reinforcing member provided in the closed-section portion and joined to the vehicle-body forming members, a joint portion of the vehicle-body forming members and the reinforcing member includes a rigid joint portion where the vehicle-body forming members and the reinforcing member are joined with a direct contact thereof and a flexible joint portion where the vehicle-body forming members and the reinforcing member are joined via a damping member provided therebetween, and this joint portion is provided at or in the vicinity of the dent portion.

In a frame having a closed-section portion which is formed by joining a first member having a U-shaped section and a second member having a flat-plate shape, a bulkhead is provided in the closed-section portion as a reinforcing member, flanges of the bulkhead and the first and second members are joined with a rigid joint portion where they are joined by a spot welding and a flexible joint portion where they are joined via a damping member. Thereby, transmission of vibrations can be properly restrained, improving the rigidity of the portion having the closed-section portion.

Disclosed is a sound-absorbing material, which has a flow resistivity R of 3.3&#xd7;10N&#xb7;s/mor more, a Young's modulus E of 1.2&#xd7;10to 2.0&#xd7;10N/m, and a loss factor &#x3b4; of 0.12 or less. The sound-absorbing material of the present invention can enhance a sound absorption capability in a wide range of a low/intermediate-frequency region to a high-frequency region at a higher level as compared with conventional sound-absorbing materials.

Sound-absorbing material, production method for sound-absorbing material, and sound-absorbing structure

The present invention is a floor panel structure of a car body that can reduce noise within the automobile cabin. The present invention is a car body floor panel structure wherein the floor of an automobile has a floor panel connected to car body frame members, and also a predetermined mode of vibration is generated to suppress the generation of acoustic emission from the floor panel. The floor panel vibration mode adjusting structure has rectangular rigidity adjusting areas that are formed by causing the floor panel to protrude upward or downward in order to generate 2&#xd7;1 mode or 2&#xd7;2 mode vibration in the floor panel in a frequency band that nearly matches the tire cavity resonance frequency.

Automotive floor panel structure

In a floor panel structure of a vehicle body in which a floor of an automotive vehicle is formed by a floor panel coupled to a plurality of frame members extending in substantially longitudinal and width directions of the vehicle, there are provided a panel area formed by being enclosed at least by the frame members, a heavy-weight area located at a substantially central portion of the panel area, and a peripheral area located substantially around the heavy-weight area, wherein the heavy-weight area is configured so as to be heavier than the peripheral area. Accordingly, the vibration energy transmitted from the frame members to the floor panel can be reduced and thereby the acoustic emission generated from the floor panel can be reduced.

Floor panel structure of vehicle body

A floor panel structure of a vehicle body where a vehicle floor has floor panels with their peripheral edges linked to a plurality of frame members that are disposed in a vehicle body lengthwise direction and a vehicle body crosswise direction and linked to an engine or a suspension is disclosed. The floor panel has a joint where at least part of its peripheral edge is joined to the frame member, a groove formed along the entire length of the joint and a high-rigidity area formed within the low-rigidity area. The low-rigidity area forms a vibration blocking area along the entire length of the joint by using a difference in rigidity from the high-rigidity area.

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

A surface defect inspection apparatus includes a light radiation source, arranged to oppose a surface to be inspected serving as a mirror surface, for radiating light having a predetermined change pattern toward the surface to be inspected, a camera mechanism for receiving an image of the light radiation source, reflected by the surface to be inspected and forming a received-light image corresponding to the change pattern of the light radiation source, and a discriminator for discriminating a surface defect portion on the surface to be inspected by discriminating a portion whose change pattern is different from the change pattern on the basis of the received-light image formed by the camera mechanism.

Growing community of inventors

Hiroshima, Japan

Tsuyoshi Sugihara