F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
F02B 77/11 (2006.01) F01N 13/14 (2010.01)
Patent
CA 2447069
An improved heat shield provides for reduced noise transmission of vehicular engine components is disclosed. The heat shield has three layers; a first sheet layer, a center insulation layer, and a second sheet layer The insulation layer is positioned between the first and second sheet layers. The first sheet layer is defined by a variable shaped periphery that is folded over the periphery of the second sheet layer to form a hem having a variable length around the heat shield. The variable length serves to reduce uneven strain in the hem area experienced daring crush forming the heat shield into the final shape. Further, the variable length of the hem also serves to alter the resonate frequency of the heat shield in specific areas to reduce vibration and improve acoustical properties.
Ce document présente un écran thermique amélioré réduisant la transmission du bruit produit par les éléments du moteur d'un véhicule. L'écran thermique comporte trois couches, soit deux plaques entre lesquelles est disposée une couche de matière isolante. Le rebord de la première plaque est replié sur l'arête de la deuxième pour constituer un rabat de longueur variable sur la circonférence de l'écran thermique. La longueur variable du bord rabattu vise à réduire les tensions créées à la circonférence de l'écran thermique pendant les opérations de formage qui lui donnent son profil final. La longueur variable du bord rabattu sert en outre à changer la fréquence de résonnance de certaines zones de l'écran, afin d'en réduire la vibration et d'améliorer ses propriétés acoustiques.
Boogemans Mark
Chen Colin C.
Matias Calin
Minkov Marsha A.
Moffat Ryan P.
Dana Automotive Systems Group Llc
Dana Corporation
Ridout & Maybee Llp
LandOfFree
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