Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Sanwa Packing Industry Co., Ltd.

Ichiro Yamagiwa

Akio Sugimoto

Zenzo Yamaguchi

Toshimitsu Tanaka

Hiroki Ueda

Yoshikazu Mukai

Kazuhisa Fujisawa

Hideki Ishitobi

Kenji Iwai

Mamoru Taniuchi

Toshihiko Sasaki

Isamu Ueki

Reiji Sanuki

Tadashi Hatayama

Kenshi Maekawa

Narikazu Hashimoto

Kyoko Masuda

Toru Sakatani

Hideo Utsuno

Mitsuo Hino

Kazuyo Akimoto

Kensuke Tsubota

Takashi Oka

Yoshinori Doumoto

A perforated sound-absorbing plate includes a perforated plate as a base material in which a large number of through holes are formed. A coating film is provided on an inner wall surface of the through hole, and a through-hole portion whose volume is smaller than a volume of the through hole is formed by the coating film.

Porous sound-absorbing board

A porous sound absorbing structure according to the present invention includes an outer materialhaving a smooth curved shape, an inner materialhaving an uneven shape with a perimeter thereof combined with a perimeter of the outer materialto form a hollow portion S between the outer materialand the inner material, and a reinforcing plate materialhaving a large number of through holesthe reinforcing plate material being attached to a surface of the inner materialon the side of the hollow portion S in such a manner that an air layer is formed between the reinforcing plate material and the surface. A sound absorbing property is given to an interior of the hollow portion S by the reinforcing plate material

Porous sound absorbing structure

Provided is an engine hood comprising: an outer panel that constitutes an outer part of the engine hood; and an inner panel that constitutes an inner part of the engine hood and that is joined to the outer panel such that a space is formed between the inner panel and the outer panel. A porous section that comprises a plurality of through holes is provided to the inner panel. An external air intake hole that guides external air into the space is provided to the engine hood.

Engine hood

This sound insulating structure () is provided with: a panel (); a sound insulating material () laminated to the panel (); a reinforcing material () provided between the panel () and the sound insulating material () and bonded to the panel (); and an air layer (S) formed between the panel () and the reinforcing material (). The reinforcing material () has a plurality of through-holes (). As a result, it is possible to suppress an increase in overall weight and to secure sound shielding properties and sound insulating properties

Sound insulating structure

A porous sound absorbing structure according to the present invention includes an outer materialhaving a smooth curved shape, an inner materialhaving an uneven shape with a perimeter thereof combined with a perimeter of the outer materialto form a hollow portion S between the outer materialand the inner material, and a reinforcing plate materialhaving a large number of through holes, the reinforcing plate material being attached to a surface of the inner materialon the side of the hollow portion S in such a manner that an air layer is formed between the reinforcing plate material and the surface. A sound absorbing property is given to an interior of the hollow portion S by the reinforcing plate material

Sound absorbency is imparted on a panel, which has increased strength and rigidity, by laminating a foam resin that is not originally permeable and does not absorb sound, and surface sheets that are not originally permeable and do not absorb sound. A sound absorption panel, obtained by laminating a foam resincomprising closed cells and aluminum alloy sheets(metal sheets), has a plurality of holesformed therein, which penetrate the foam resinand the aluminum alloy sheetsin the thickness direction. The holesare formed by forcing a needle(hole-forming means) through the foam resinand the aluminum alloy sheets

Sound absorption panel

A material for processing includes an elastically deformable single thin plate comprising a plurality of through-holes. The plate has a first wave-like shape, which is formed in a first direction and, in which troughs and ridges are alternately connected in repetition, and a second wave-like shape which is formed in a second direction crossing the first direction and in which troughs and ridges are alternately connected in repetition. The first wave-like shape has a corrugated shape in which the ridges each include a pair of side parts rising from the corresponding troughs and an apex part connected between the pair of side parts. An apex length of the apex part along the first direction is defined as being longer than an opening length, along the first direction, between base parts of the pair of side parts.

Material for processing and molded member using the same

A sound absorbing structure having excellent in sound absorbing performance, which is capable of achieving 0.4 or higher in the sound absorbing coefficient even in the case where a perforated panel is a thin plate such as aluminum foil within a range where a reduction in the weight of a vehicle body is not impaired and through holes have a large hole diameter in order to make the processing of providing a large number of through holes in the perforated panel. The sound absorbing structureis the sound absorbing structurefor suppressing noise generated on a sound source side, which is equipped with: a perforated panelhaving a large number of through holesand a fiber material, which are provided so as to face the sound source side and provided so as to overlap with each other; and an air layerprovided behind the perforated panel, in which the density and the thickness of the fiber materialand the hole diameter and the aperture rate of the through holesof the perforated panelseverally have a specific relationship.

Sound absorbing structure

A perforated soundproof structure is formed by oppositely arranging an external plateand an internal platehaving a number of through-holes. The board thickness, hole diameter and open area ratio of the internal plateare set to satisfy design conditions to give rise to a viscous effect in the air passing through the through-holes, and the design conditions are set so that the frequency bandwidth to attain an absorption coefficient of 0.3 or more is 10% or more of the resonance frequency.

Perforated soundproof structure and method of manufacturing the same

Double-walled damping structure

A truss type extruded aluminum section is formed of a pair of planar plates and ribs, wherein hollow portions are formed within said section by the ribs and the planar plates. Vibration-damping resin is provided on the inner surfaces of hollow portions, and particularly on the inner surface of the planar plate and on a single surface of the inclined rib. With this arrangement, the vibration energy bending the planar plate and the rib is converted into a heat energy. In the case of manufacturing such truss type extruded aluminum vibration-damping section, for making easy the insertion of the vibration-damping resin in the hollow portion, the vibration-damping resin is stuck on a plastic film to form a long planar body. The plastic film serves as a cover or an adhesive. Moreover, in the case of directly inserting the vibration-damping resin sheet, the vibration-damping resin sheet is subjected to embossing on the adhesive-bonding side for allowing air to escape. Additionally, in the case using an age-hardening type aluminum alloy, the adhesive-bonding for the vibration-damping resin by heating is performed along with the heat treatment for age-hardening.

Method of manufacturing and using vibration-damping material

A truss type extruded aluminum section (1) is formed of a pair of planar plates (2)(3) and ribs (4)(5)(6), wherein hollow portions (7)(8)(9) are formed within the section (1) by the ribs (4)(5)(6) and the planar plates (2)(3). Vibration-damping resin is provided on the inner surfaces of hollow portions (7)(8)(9), and particularly on the inner surface of the planar plate (3) and on a single surface of the inclined rib (4). With this arrangement, the vibration energy bending the planar plate (3) and the rib (4) is converted into a heat energy. In the case of manufacturing such truss type extruded aluminum vibration-damping section (1), for making easy the insertion of the vibration-damping resin in the hollow portion, the vibration-damping resin is stuck on a plastic film (11) to form a long planar body. The plastic film (11) serves as a cover or an adhesive. Moreover, in the case of directly inserting the vibration-damping resin sheet (14), the vibration-damping resin sheet (14) is subjected to embossing on the adhesive-bonding side for allowing air to escape. Additionally, in the case using an age-hardening type aluminum alloy, the adhesive-bonding for the vibration-damping resin by heating is performed along with the heat treatment for age-hardening.

Growing community of inventors

Kobe, Japan

Ichiro Yamagiwa