Patent ID: 7942239
Filing Date: 2011-05-17
Classification: F01N

Abstract:
1. An engine exhaust muffler for reducing sounds from pressure waves of combustion gases from an exhaust flow traveling through an exhaust pipe of a vehicle wherein the flow is caused by gases exhausted from one or more exhaust valves of an internal combustion engine in sound or fluid pulses relating to the flow from these one or more valves, said muffler comprising an elongated fluid passage extending between a muffler inlet and a muffler outlet and said muffler inlet and muffler outlet being connectable with an associated exhaust pipe of the vehicle whereby the elongated fluid passage forms a portion of the associated exhaust pipe and has a cross-sectional area similar to adjacent portions of the associated exhaust pipe such that the exhaust flow travels through said elongated fluid passage without restriction, said muffler further including a closed sound chamber surrounding said passage formed by a side wall extending about said fluid passage and extending between two end plates, said muffler further including at least one tubular connector in said fluid passage between said end plates for fluid communication between said passage and said closed sound chamber, said at least one connector having a tubular body with a first end joined to an opening in said passage and a second end opening into said closed sound chamber, said at least one tubular connector having a perforated resistance plate to restrict the fluid flow between said passage and said sound chamber thereby reducing the severity of the fluid pulses entering said sound chamber, perforations in said perforated plate forming an open portion of said plate and said open portion being less than 60 percent thereby allowing said side wall to be made from thinner material and the weight of said muffler to be reduced.