Internal Combustion Engine with Wind Exhaust Duct and Vehicle Mounted with Internal Combustion Engine

摘要

To increase the wind volume of the cooling wind flowing through a radiator and to enhance the cooling performance of the radiator (52) by providing a wind exhaust duct (70, 80) using a crankcase (23) of an internal combustion engine (E). A cooling device (50) of the internal combustion engine (E) includes a radiator (52) arranged lateral to crankcases (23a, 23b), and a wind exhaust duct (70) for exhausting the cooling wind passed through the radiator (52) to the atmosphere. The wind exhaust duct (70) is arranged extending along a rotational axis of the crankshaft at the upper portion of the crankcases (23a, 23b) and the upper portion of the transmission case (16).