Air flow system for circular rotary type engines

An air flow system for circular rotary engines of the type having an engine housing with a generally cylindrical side wall and end walls at each end, a pair of cylindrical piston rotors mounted therein for simultaneous axial rotation and reciprocating longitudinal movement and each having a coaxial inner sleeve and outer sleeve with a symmetrically undulating surface at an outward facing end and interior gear teeth engaged with a drive gear for rotating a central drive shaft, a pair of opposed end rings near each end of said housing each having inwardly facing undulating surfaces symmetrical with the undulating surfaces of each said piston rotor such that the undulating surfaces cooperate to alternately create a volume area and displace the volume area in some portion during rotation thereby alternately opening and closing a series of chambers at the end of each said piston rotor with the reciprocating movement during axial rotation, said air flow system comprising:

• a plurality of circumferentially spaced air intake ports and exhaust ports through said housing side wall, said intake ports disposed near the center of said housing and said exhaust ports disposed near each end thereof;
• a plurality of circumferentially spaced fan blades at an inward facing end of said piston rotor outer sleeve configured to draw exterior air through said intake ports upon rotation, into said housing, and between said piston rotor inner and outer sleeves, thereby cooling the interior surfaces of said piston rotor;
• air flow diverting means at the center of said engine configured to receive air from said piston rotor fan blades and direct it between each said piston rotor inner and outer sleeves toward their outward facing ends and onto said drive gear thereby cooling the interior surfaces of said inner and outer piston rotor sleeves and drive gear.