Damped heat shield
AssigneeSoundwich, Inc.
InventorsDan T. Moore, III, Austin W. Moore, Maurice E. Wheeler
Life of this patent
Estimating the term…
Abstract
A damped heat shield for a high temperature portion of a vehicle exhaust system. The heat shield has inner and outer metal layers of substantially different thicknesses and substantially different resonant frequencies, which causes the shield to damp vibrational energy and reduce radiated sound energy and noise. Between the metal layers is a layer of sound and heat shielding material such as aluminum foil or ceramic fiber paper. The metal layers are preferably stainless steel, cold rolled steel, aluminized steel, aluminum-clad steel, or aluminum. If cold rolled steel is used, the exterior of the shield is preferably coated with a corrosion-resistant coating.
Claims43
A damped heat shield for an exhaust system of an internal combustion engine, comprising two metal layers shaped to conform generally to the shape of a high temperature portion of said exhaust system while being spaced away therefrom by an air gap, said metal layers having substantially the same shape and extending in face-to-face adjacency, a layer of sound and heat shielding material positioned between said two metal layers, one of said metal layers having a first predetermined thickness and having a first resonant frequency, the other of said metal layers having a second predetermined thickness substantially different from said first predetermined thickness and having a second resonant frequency substantially different from said first resonant frequency causing said shield to damp vibrational energy, said shield being adapted to be fixed in relationship to said high temperature portion so as to provide said air gap.
Dependencies are inferred from the claim text.