Exhaust silencer with acoustic damping mat
An exhaust silencer includes an upper shell and a lower shell attached to the upper shell to define an internal cavity. Acoustic damping material is positioned within said internal cavity to reduce radiated and transmitted noise. A plurality of retention members compresses the acoustic damping material against an inner surface of the upper shell. The acoustic damping material is only located in the upper shell and thus is not affected by condensate that collects in the lower shell.
1 . An exhaust silencer comprising:
an upper shell;
a lower shell attached to said upper shell to define an internal cavity; and
acoustic damping material held within said internal cavity against said upper shell.
2 . The exhaust silencer according to claim 1 wherein said acoustic damping material is compressed against an inner surface of said upper shell.
3 . The exhaust silencer according to claim 2 wherein said acoustic damping material comprises a mat having a first surface substantially engaging said inner surface and a second surface facing said internal cavity.
4 . The exhaust silencer according to claim 3 including at least one compression member in engagement with said second surface to generate a retaining force for holding said mat against said upper shell.
5 . The exhaust silencer according to claim 4 wherein said at least one compression member comprises a plurality of straps.
6 . The exhaust silencer according to claim 5 wherein each of said plurality of straps has a pair of strap ends interconnected by a center portion wherein said center portion engages said mat with each of said pair of strap ends being directly attached to said upper shell.
7 . The exhaust silencer according to claim 3 wherein said inner surface of said upper shell has a first portion and a second portion wherein said first portion is uncovered and said second portion is covered with said mat.
8 . The exhaust silencer according to claim 1 wherein said acoustic damping material is only located in said upper shell.
9 . The exhaust silencer according to claim 8 including an inlet to be in communication with a first exhaust system component and an outlet to be in communication with a second exhaust system component wherein said acoustic damping material reduces radiated and transmitted noise as exhaust air moves through said internal cavity from said inlet to said outlet.
10 . The exhaust silencer according to claim 8 wherein said acoustic damping material includes fiberglass material.
11 . An exhaust silencer comprising:
an upper shell;
a lower shell attached to said upper shell to define an internal cavity;
acoustic damping material positioned within said internal cavity; and
a plurality of retention members compressing said acoustic damping material against an inner surface of said upper shell.
12 . The exhaust silencer according to claim 11 wherein said lower shell provides an uncovered inner surface spaced apart from said acoustic damping material.
13 . The exhaust silencer according to claim 11 wherein said acoustic damping material is only located in said upper shell.
14 . The exhaust silencer according to claim 13 wherein said plurality of retention members comprises a plurality of straps with each of said plurality of straps having a center portion interconnecting a pair of strap ends, said center portion engaging said acoustic damping material with each of said pair of strap ends being directly attached to said upper shell.
15 . The exhaust silencer according to claim 14 wherein each end of said pair of strap ends is welded to said upper shell.
16 . The exhaust silencer according to claim 14 wherein said upper shell includes an upper wall and a pair of vertical side walls extending from opposing edges of said upper wall and wherein said plurality of straps includes a first strap fixed to one of said pair of vertical side walls, a second strap fixed to another of said pair of vertical side walls, a third strap fixed to said upper wall adjacent one of said opposing edges, and a fourth strap fixed to said upper wall adjacent another of said opposing edges.
17 . The exhaust silencer according to claim 14 wherein said acoustic damping material comprises a mat that covers one portion of said inner surface of said upper shell while leaving a second portion of said inner surface of said upper shell uncovered.
18 . The exhaust silencer according to claim 17 wherein said mat is formed from a fiberglass material, and said plurality of straps and said upper shell are formed from a stainless steel material.