Patent ID: 7713493
Filing Date: 2010-05-11
Classification: F01N

Abstract:
1. A combination exhaust muffler and aftertreatment element and water trap assembly, said aftertreatment element being selected from the group consisting of at least one of a catalyst element and a particulate soot filter, said assembly comprising a housing extending axially along a vertical axis and having a housing sidewall, said housing having a lower inlet for receiving exhaust from an internal combustion engine, and an upper outlet for discharging said exhaust and spaced above said lower inlet, said aftertreatment element being housed in said housing and spaced radially inwardly of said housing sidewall by a radial gap defining an annular space therebetween, a dome care in said housing above said aftertreatment element and below said upper outlet and blocking entry of water axially downwardly therepast into said aftertreatment element from said upper outlet and instead diverting and shedding said water radially outwardly into said annular space, and one or more drain holes draining water from said annular space, wherein said housing has a lower flange spanning and closing said annular space to form a collection space for said water, and comprising a perforated tube extending axially in said housing between said lower flange and said dome care and through which exhaust flows radially outwardly, said perforated tube being in said annular space and radially between said aftertreatment element and said housing sidewall, wherein said dome care is axially spaced above said aftertreatment element by a first axial gap, and is axially spaced below said upper outlet by a second axial gap, said aftertreatment element has an inlet face facing axially downwardly, and has an outlet face facing axially upwardly toward said dome care and axially spaced therebelow by said first axial gap, wherein said perforated tube divides said annular space into a first annular subspace and a second annular subspace, said perforated tube being radially spaced outwardly of said aftertreatment element by said first annular subspace therebetween, said housing sidewall being radially spaced outwardly of said perforated tube by said second annular subspace therebetween.