US Patent 7559297 Portable Engine

A portable engine, comprising an engine casing, an air deflector cover, a fan and an exhaust pipe; a left upper baffle plate and a right upper baffle plate at the upper part of the engine constitute two left and right upper air ducts together with a cylinder head cover and the engine casing; a left lower baffle plate and a right lower baffle plate at the lower part of the engine constitute two left and right lower air ducts together with the engine casing; and a base plate of the engine and the engine casing constitute a bottom air duct. The portable engine can specifically cool each part through controlling air intake of each air duct, thus attaining better cooling effect for the engine.