Stamp formed muffler with hermetically sealed laminated...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 13/00 (2010.01) F01N 13/18 (2010.01) B21D 53/84 (2006.01) B21D 53/88 (2006.01) B23K 26/28 (2006.01) F01N 1/02 (2006.01) F01N 7/00 (2006.01) F01N 7/18 (2006.01)

Patent

CA 2118780

A muffler and a method of manufacturing a muffler are provided. The muffler includes a pair of stamp formed laminated external shells, each of which includes inner and outer layers. The inner and outer layers are stamped simultaneously to nest with one another. However, the respective layers of each laminated shell will spring back slightly differently from one another in view of different metallurgical characteristics inherent in each sheet. The laminated external shells are then disposed around internal components of the muffler, and peripheral regions are securely clamped together. This clamping, in view of the differential spring-back creates a narrow air chamber between the layers of each laminated external shell. Peripheral regions are then laser welded together to hermetically seal the narrow air chamber between the layers of each external shell. The hermetically sealed air chamber effectively dampens vibrations of the external shells and contributes to both heat and noise insulation from interior regions of the muffler.

La présente invention vise un silencieux ainsi que la méthode de fabrication connexe. Le silencieux comprend deux cylindres externes constitués de deux feuilles métalliques stratifiées, l'une extérieure et l'autre intérieure, matricées simultanément de manière à s'imbriquer l'une dans l'autre. Chaque feuille respective de chaque cylindre présente une réaction élastique quelque peu différente des autres feuilles en raison des caractéristiques inhérentes du métal qui la compose. Les cylindres externes sont disposés autour des éléments internes du silencieux et les portions périphériques sont fermement fixées les unes aux autres, ce qui crée, en raison de la réaction élastique différentielle mentionnée précédemment, une étroite lame d'air entre les diverses feuilles de métal constituant chaque cylindre. Les portions périphériques sont ensuite soudées au laser, ce qui a pour effet de sceller la lame d'air. C'est cette lame d'air parfaitement scellée qui amortit les vibrations des cylindres externes et qui contribue à réduire les bruits et la chaleur provenant des parties internes du silencieux.

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