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Home Vibration and Earthquake Isolation Laminated-damping-material-for-vehicle-and-method-for-welding-the-material-to-vehicle-body-panel

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 Laminated damping material for vehicle and method for welding the material to vehicle body panel

Details
Inventors: Honma, Hiyoshi; Fukagawa, Masami; Haga, Hitoshi; Yamashita, Tsuyoshi; Nakamura, Mitsuo;
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Van Balen; William J.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido Marmelstein Kubovcik & Murray

A laminated material as a damping member welded to a panel of a vehicle body comprises a lower sheet of a foamable mer-sheet, an upper sheet of a non-foamable mer-sheet and an intermediate sheet of a reduced size to be interposed between the upper and lower sheets, wherein the upper and lower sheets are welded together at their peripheral end portions which come into direct contact with each other in laminated state. This structure probilits any irregularities present on the body panel surface from appearing on the upper surface of the laminated material and provides a good damping effect. A method for welding a laminated damping material to a vehicle body panel uses an oven which is used in a coating step of a vehicle body assembly line, dry heat of the oven permitting the layer of a foamable material to get foamed and fluidized when the damping material is passed through the oven the coating step, thus providing a thermal welding between the damping material and the panel. This method simplifies the assembling operation.

DETAILED DESCRIPTION The present invention has been proposed in view of the above circumstances and its object is to provide a laminated damping material for a vehicle which does not allow any irregularities, which may be formed by beads or the like on a vehicle body panel such as floor panel, to be felt by passengers and moreover which is excellent in vibration proofing, sound insulating and thermal insulating abilities.
Another object of the invention is to provide a method for welding a laminated damping material to a vehicle body panel, which serves to avoid the vehicle body assembling process from becoming complicated.
In order to achieve the above object, the invention provides a damping material which comprises a lower layer sheet formed of a foamable mer-sheet to be welded onto a vehicle body panel, an intermediate layer sheet laminated on the lower sheet, and an upper layer sheet formed of a non-foamable mer-sheet and laminated on the intermediate sheet, wherein the lower and upper sheets are formed to be larger in size than the intermediate sheet and those lower and upper sheets have peripheral end portions thereof superposed with each other in a directly contacting fashion, the peripheral end portions being welded together.
A laminated damping material constructed in the mentioned manner is advantageous in the following: (1) The damping material has a unitarized three-layer lamination structure including upper and lower sheets which function as damping members and therefore can have a high vibration proofing property as well as high thermal- and sound-insulating properties.
(2) Even if ruggedness is present on the vehicle body panel surface such a by provision of beads, the lower sheet can be brought into tight contact with such rugged parts while keeping the upper surface of the laminated damping material flat.
Any ruggedness does not appear on that upper surface and moreover the material can be strongly bonded to the vehicle body panel surface.
(3) No fixing means such as clips are needed to unitarize the laminated damping material with the panel surface



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