Damped heat shield
AssigneeSoundwich, Inc.
InventorDan T. Moore, III
Life of this patent
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Abstract
A damped heat shield for a vehicle exhaust manifold includes inner and outer thin steel layers. An intermediate aluminum layer is located between the two steel layers. A high temperature corrosion-resistant coating is applied to the exterior surfaces and the edges of the shield. Such coating along the edges prevents the entry of corrosion producing substances into the interior of the shield. The outer steel layer has a thickness greater than the inner steel layer, so that the two layers do not resonate at the same frequency, and therefore, tend to damp vibrational energy more efficiently and reduce radiated sound energy and noise.
Claims16
A high temperature damped heat shield for an exhaust system of an internal combination engine, comprising two layers of sheet steel shaped to conform generally to the shape of a high temperature portion of said exhaust system while being spaced therefrom by an air gap, said layers having substantially the same shape and extending in face-to-face adjacency, one of said layers having a first predetermined thickness and having a first resonant frequency, the other of said 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, and corrosion-resistance means protecting the exterior surfaces of said shield from corrosion at the temperatures encountered thereby.
Dependencies are inferred from the claim text.