| 摘要 |
<p>In a recreational vehicle such as a snowmobile where the engine and muffler are positioned within a common housing, the muffler is enclosed within a jacket which defines a cooling chamber there around. Cooling means such as a fan is provided for directing a flow of cooling air through the chamber and for ducting said flow to atmosphere on the exterior of said housing thereby to inhibit transfer of heat from said exhaust system into said housing. Where the engine is air-cooled having an array of cooling fins disposed on its exterior, an engine-driven fan is arranged to pass cooling air within a shroud and across said cooling fins, and the cooling means includes a duct adjacent the fan and adapted to direct cooling air from within said shroud to the chamber.</p> |
