Double walled baffle

B - Operations – Transporting – 62 – D

Patent

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Details

B62D 25/00 (2006.01) B60R 13/08 (2006.01) B62D 29/00 (2006.01)

Patent

CA 2402551

An expandable baffle (16) for sealing a cavity (24) of an automobile (10) is provided. The baffle (16) includes a thermally expandable sealing material (18) which has an expansion temperature similar to the temperatures achieved in specific stages of the automotive manufacturing processes (e.g., the paint bake stage). The inventive baffle (16) further includes a support (20) for the sealing material (18) which maintains the material at the desired location within the cavity (24) until thermal expansion. The support (20) is formed of a material having a melting point higher than the thermal expansion temperature of the sealing material (18). In one embodiment, the support comprises a pair of solid, spaced-apart sidewalls (26a, 26b) that "bow" upon expansion of the sealing material (46). In an alternate embodiment, the sidewalls (62a, 62b) include a plurality of openings (64) formed therein through which the sealing material (52) flows during thermal expansion. The inventive baffles (FIGS. 2, 5, 6) are useful for providing noise attenuation and for sealing the cavity (24) from moisture and contaminants while providing a limited degree of structural reinforcement.

L'invention concerne une cloison expansible (16) destinée à rendre étanche un espace vide d'une automobile (10). La cloison (16) comprend un matériau d'étanchéité thermo-expansible (18) dont la température d'expansion est voisine des températures utilisées dans des étapes spécifiques de fabrication d'une automobile (par exemple, lors de l'étape de cuisson de peinture). Cette cloison (16) comprend, en outre, un support (20) permettant de maintenir le matériau d'étanchéité (18) à l'emplacement recherché à l'intérieur de l'espace vide (24) jusqu'à son expansion thermique. Le support (20) est formé d'un matériau possédant un point de fusion supérieur à la température d'expansion thermique du matériau d'étanchéité (18). Dans une réalisation, le support comprend une paire de parois latérales (26a, 26b) solides, espacées, qui se "courbent" lors de l'expansion du matériau d'étanchéité (46). Dans une autre réalisation, les parois latérales (62a, 62b) comportent de nombreux orifices (64) à travers lesquels le matériau d'expansion (52) s'écoule durant son expansion thermique. Ces cloisons (FIGS 2, 5, 6) permettent d'obtenir une réduction de bruit et de protéger l'espace vide (24) contre l'humidité et de contaminants tout en fournissant un certain degré de renforcement structurel.

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