Air shroud for cylinder and cylinder head assemblies

Air shroud for cylinder and cylinder head assemblies of air-cooled compressors and engines of the type having a cooling air fan for producing an axial flow of cooling air and an array of cylinder and cylinder head assemblies arranged in the path of the axial flow and extending radially relative to the axis of said flow, said shroud comprising:

• a flow channel portion having a polygonal segment shape wrapping around the periphery of the array of cylinder and cylinder head assemblies and forming an air channel which extends from said cooling air fan, at a first axial edge, to a point between 50% and 90% of the distance across said cylinder head assemblies, at an opposite axial edge of the flow channel portion in an air flow direction;
• fastening means for attaching said flow channel portion atop each of the cylinder and cylinder head assemblies;
• and fins depending from said flow channel portion at said opposite axial edge;
• wherein each of said fins blocks an open area between adjacent cylinder and cylinder head assemblies in a manner creating an airflow orifice gap about its perimeter between the fin and the adjacent cylinder and cylinder head assemblies as a means for increasing the airflow and airflow rate of said cooling air over the cylinder and cylinder head assemblies and for creating a wrapping of said airflow around said cylinder head assemblies after said cooling air passes through said orifice gap.