# US 2013/0153329 A1 · Quiet muffler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153329 A1 - Document ID: US20130153329A1 - Status: Published application - Kind: A1 - Application number: 13/721,347 - Filed: 2012-12-20 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Catalytic Combustion Corporation - Inventors: Randall Joseph Bischel; Thomas Philip King - Web page: https://patentgrep.com/patent/US20130153329A1 ## CPC - F01N 13/08: Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)} - F01N 1/08: by reducing exhaust energy by throttling or whirling - F01N 13/1888: {the housing of the assembly consisting of two or more parts, e.g. two half-shells} - F01N 2470/02: Tubes being perforated - F01N 2470/16: Plurality of inlet tubes, e.g. discharging into different chambers - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) ## Abstract An exhaust system includes a muffler, an inlet pipe, and an exhaust pipe. The muffler includes an inlet hole adapted to receive the inlet pipe and an outlet hole to receive the exhaust pipe. The inlet pipe has a first and second linear portions extending from a radiused portion, the first and second linear portions being generally perpendicular to one another. The radiused portion and the first linear portion of the inlet pipe are positioned within the muffler. Portions of the inlet pipe and exhaust pipe located within the muffler may optionally include perforations and be closed off. ## Claims ### Claim 1 A reduced noise muffler for use with an exhaust system comprising: a hollow shell member having a first end, a second end, a first inlet opening, a second inlet opening and an outlet opening, said first end opposing said second end along a longitudinal axis; a first inlet tube for receiving exhaust gases, said first inlet tube passing through said first inlet opening and having a first linear portion, a second linear portion and a radiused bend located between said first and second linear portions, wherein said first linear portion of said first inlet tube is positioned within said first inlet opening; a second inlet tube for receiving exhaust gases, said second inlet tube passing through said second inlet opening and having a first linear portion, a second linear portion and a radiused bend located between said first and second linear portions, wherein said first linear portion of said second inlet tube is positioned within said second inlet opening; and an exhaust pipe to permit the exhaust gases to exit said hollow shell member, said exhaust pipe extending through said outlet opening; wherein the second linear portion of said first inlet tube and the second linear portion of said second inlet tube are positioned within said muffler substantially coaxially and are generally in parallel alignment to each other and the longitudinal axis of said hollow shell member. ### Claim 2 (depends on 1) The reduced noise muffler of claim 1, wherein each of said first inlet tube and said second inlet tube further comprise a first open end, for connecting to an engine, and a second open end, for bringing exhaust gases into said hollow shell member, wherein said first inlet tube and said second inlet tube are oriented so that the second open end of said first inlet tube and the second open end for said second inlet tube face each other. ### Claim 3 (depends on 1) The reduced noise muffler of claim 1, wherein the second open ends of the second linear portion of said first inlet tube and the second linear portion of said second inlet tube are blocked and the second linear portion of said first inlet tube and the second linear portion of said second inlet tube are perforated to permit exhaust gases to enter said hollow shell member. ### Claim 4 (depends on 1) The reduced noise muffler of claim 1, wherein said exhaust pipe further comprises a first linear portion having an end opening to permit exhaust gases to enter said exhaust pipe, a second linear portion and a radiused bend located between said first and second linear portions. ### Claim 5 (depends on 4) The reduced noise muffler of claim 4, wherein said end opening of said first linear portion of said exhaust pipe is located about 0.5 inches from said first end of said hollow shell member. ### Claim 6 (depends on 4) The reduced noise muffler of claim 4, wherein: said end opening of said first linear portion of said exhaust pipe is blocked; and said first linear portion of said exhaust pipe is perforated to permit exhaust gasses to enter said exhaust pipe. ### Claim 7 (depends on 6) The reduced noise muffler of claim 6, wherein said blocked end opening of said first linear portion of said exhaust pipe is located about 0.5 inches from the inner surface of said first end of said hollow shell member. ### Claim 8 (depends on 1) The reduced noise muffler of claim 1, wherein said first inlet tube and said second inlet tube each further comprise a flange that is adapted to connect an engine. ### Claim 9 (depends on 1) The reduced noise muffler of claim 1, wherein said muffler is devoid of baffles, transfer tubes, and multiple expansion chambers to maximize the size of a single expansion chamber within said hollow shell member. ### Claim 10 (depends on 1) The reduced noise muffler of claim 1, wherein the shape and configuration of the first and second inlet tubes and the exhaust pipe create flow patterns of the exhaust gases within said hollow shell that improve sound attenuation, thereby lowering the noise of the muffler and improving sound quality. ### Claim 11 A reduced noise muffler for use with an exhaust system comprising: a hollow shell member having a first end, a second end, an inlet opening, and an outlet opening; an inlet tube for receiving exhaust gasses, said inlet tube passing through said inlet opening and having a first linear portion, a second linear portion and a radiused bend located between said first and second linear portions, wherein said first linear portion is positioned within said inlet opening and said a second linear portion and said radiused bend are positioned within said hollow shell member; and an exhaust pipe to permit the exhaust gasses to exit said hollow shell member; wherein said muffler is devoid of baffles, transfer tubes, and multiple expansion chambers to maximize the size of a single expansion chamber within said hollow shell member ### Claim 12 (depends on 11) The reduced noise muffler of claim 11, wherein said exhaust pipe further comprises a first end portion including a first end opening positioned within said hollow shell member and a second end portion including a second end opening, said second end portion extending out of said hollow shell member through said outlet opening. ### Claim 13 (depends on 11) The reduced noise muffler of claim 11, wherein said exhaust pipe is substantially straight. ### Claim 14 (depends on 11) The reduced noise muffler of claim 11, wherein said end opening of said second linear portion of said inlet tube is blocked and said second linear portion of said inlet tube is perforated to permit exhaust gasses to enter said hollow shell member. ### Claim 15 (depends on 11) The reduced noise muffler of claim 11, wherein said inlet tube further comprises a flange that is adapted to connect to an engine. ### Claim 16 (depends on 12) The reduced noise muffler of claim 12, wherein: said first end opening of said first end portion of the exhaust pipe is blocked; and said second end portion of said exhaust pipe is perforated to permit exhaust gasses to enter said exhaust pipe. ### Claim 17 (depends on 11) The reduced noise muffler of claim 11, wherein the shape and configuration of the inlet tube and the exhaust pipe create flow patterns of the exhaust gases within said hollow shell that improve sound attenuation, thereby lowering the noise of the muffler and improving sound quality.