Patent ID: 8899191

Claim:
A cooling apparatus of an engine, the cooling apparatus comprising: an engine body portion including a cylinder and a cylinder head connected to the cylinder, the cylinder head having a front surface, a right side surface, a rear surface, and a left side surface; a crankshaft extended in a right and left direction; a cooling fan fixed to one end of the crankshaft; a fan housing surrounding the cooling fan; a shroud guiding cooling air discharged from an interior of the fan housing to an outer circumferential surface of the engine body portion; a cooling air passage formed in a cross-shape in the cylinder head and including a first cooling air passage and a second cooling air passage, the first cooling air passage and the second cooling air passage being included in a same plane that is orthogonal to a center line of the cylinder, wherein the first cooling air passage has an inlet opening in the front surface of the cylinder head; and a narrowed guide portion formed in the shroud, the narrowed guide portion guiding the cooling air to the inlet opening of the first cooling air passage, wherein the second cooling air passage is parallel to the crank shaft and extends from the right side surface to the left side surface of the cylinder head, and the first cooling air passage is orthogonal to the second cooling air passage, wherein the first cooling air passage is orthogonal to the second cooling air passage and the center line of the cylinder, and the first cooling passage extends from the front surface to the rear surface of the cylinder head, and wherein the shroud and the narrowed guide portion guide the cooling air generated in the interior of the fan housing located at a right side or a left side of the engine body portion to the inlet opening of the first cooling passage so as to allow the cooling air to flow in a front-rear direction in the first cooling air passage.