# US 2013/0167727 A1 · Air filter and silencer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0167727 A1 - Document ID: US20130167727A1 - Status: Published application - Kind: A1 - Application number: 13/730,555 - Filed: 2012-12-28 - Published: 2013-07-04 - Earliest claimed: 2011-12-30 - Assignees: Walker Engineering Company - Inventors: Robert Walker - Web page: https://patentgrep.com/patent/US20130167727A1 ## CPC - F02M 35/14: Combined air cleaners and silencers - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF ## Abstract Air filter and silencers comprise an air filter element having an annular body with openings at opposed ends. A top is attached over one of ends, has an outer flange sealed to the element, and includes a central section extending across the air filter element end. The top central section has a convex-shaped geometry with a radius of curvature projecting outwardly and away from the air filter element. The top central section includes a sound deadening material directed towards the air filter element. The top central section has a radius of curvature greater than the radius of an inside diameter of the air filter element. The air filter and silencer is used with an air filter assembly that includes a housing removably attached to the air filter and silencer, and that has an internal chamber projecting axially into the air filter and silencer with a sound deadening material disposed therein. ## Claims ### Claim 1 An air filter and silencer comprising: an air filter element comprising a body having an filtration material disposed therein in a manner permitting the passage of air through air filtration material, and filtering of the air being passed through the air filtration material, the air filter element comprising openings at opposed ends of the body; and a top disposed over and attached to one of the air filter element openings, the top comprising: an outer flange that is sealed and attached to the air filter element opening; and a central section extending across the otherwise open end of the air filter element, the central section having a convex-shaped geometry with a radius of curvature projecting outwardly and away from the air filter element. ### Claim 2 (depends on 1) The air filter and silencer as recited in claim 1 wherein the top central section further comprises a sound deadening material disposed along an inside wall that is directed towards the air filter element. ### Claim 3 (depends on 1) The air filter and silencer as recited in claim 1 wherein the radius of curvature is greater than the radius of an inside diameter of the air filter element. ### Claim 4 (depends on 1) An air filter assembly comprising the air filter and silencer as recited in claim 1, the assembly further comprising a housing that is removably attached to the air filter and silencer, the housing comprising an internal chamber that projects axially into the air filter and silencer and that comprises a sound deadening material disposed therein. ### Claim 5 (depends on 4) The air filter assembly as recited in claim 4 wherein an end of the housing internal chamber is positioned a distance of less than about 80 mm from the air filter and silencer top. ### Claim 6 (depends on 5) The air filter assembly as recited in claim 5 wherein an end of the housing internal chamber is positioned a distance of from about 30 mm to 50 mm from the air filter and silencer top. ### Claim 7 (depends on 4) The air filter assembly as recited in claim 4 wherein the housing internal chamber extends from one end that is positioned within the air filter and silencer to an opposite end that is positioned outside of the air filter and silencer, wherein the sound deadening material extends between both ends. ### Claim 8 (depends on 4) The air filter assembly as recited in claim 4 wherein the housing internal chamber has a constant inside diameter that extends from a first end disposed within the air and silencer to a second end positioned outside of the air filter element and silencer. ### Claim 9 (depends on 4) The air filter assembly as recited in claim 4 wherein the housing internal chamber has first outside diameter that extends a distance from a first end disposed within the air and silencer, and second outside diameter extends a distance from the end positioned outside of the air filter element and silencer, wherein the first outside diameter is greater than the second outside diameter. ### Claim 10 An air filter assembly comprising: a housing comprising an air outlet section, a flange projecting radially away from the air outlet section, an internal member and an annular chamber, wherein the annular chamber comprises a sound deadening material disposed therein; an air filter and silencer that is releasibly attached to the housing, the air filter and silencer comprising: an air filter element having body with an air filtration material disposed therein, wherein the body include openings at opposed ends of the body; and a top disposed over and attached to one of the air filter element openings, the top comprising: an outer flange that is sealed and attached to the air filter element opening; and a central section extending across the otherwise open end of the air filter element, the central section having a convex-shaped geometry with a radius of curvature projecting outwardly and away from the air filter element. ### Claim 11 (depends on 10) The air filter assembly as recited in claim 10 wherein the top comprises a sound deadening or sound absorbing material disposed along an inside surface. ### Claim 12 (depends on 10) The air filter assembly as recited in claim 10 wherein the sound deadening material in the annular chamber extends from the air outlet section to the internal member. ### Claim 13 (depends on 10) The air filter assembly as recited in claim 10 wherein the internal member includes an end that is positioned a distance of less than about 80 mm from the air filter and silencer top. ### Claim 14 (depends on 10) The air filter assembly as recited in claim 10 wherein the internal member includes an end that is positioned a distance of from about 30 mm to 50 mm from the air filter and silencer top. ### Claim 15 An air filter and silencer comprising: an annular air filter element having open opposed ends; and a top disposed over and attached to one of the air filter element ends, the top comprising: an outer flange that is sealed and attached to the air filter element end; and a central section extending across the open end of the air filter element, the central section having a convex-shaped geometry with a radius of curvature projecting outwardly and away from the air filter element, the central section comprising a sound deadening material disposed thereon, and the radius of curvature being greater than the radius of an inside diameter of the air filter element. ### Claim 16 (depends on 15) An air filter assembly comprising the air filter and silencer as recited in claim 15, the assembly comprising a housing that is removably attached to the air filter and silencer, the housing comprising an internal chamber that projects axially into the air filter and silencer and that comprises a sound deadening material disposed therein. ### Claim 17 (depends on 16) The air filter assembly as recited in claim 16 wherein an end of the housing internal chamber is positioned a distance of less than about 80 mm from the air filter and silencer top. ### Claim 18 (depends on 17) The air filter assembly as recited in claim 17 wherein an end of the housing internal chamber is positioned a distance of from about 30 mm to 50 mm from the air filter and silencer top. ### Claim 19 (depends on 16) The air filter assembly as recited in claim 16 wherein the housing internal chamber extends from one end that is positioned within the air filter and silencer to an opposite end that is positioned outside of the air filter and silencer, wherein the sound deadening material extends between both ends. ### Claim 20 (depends on 4) The air filter assembly as recited in claim 4 wherein the housing internal chamber has a constant inside diameter that extends from a first end disposed within the air and silencer to a second end positioned outside of the air filter element and silencer.