Cooling unit for air-cooled internal combustion engine

摘要

An inventive cooling unit for an internal combustion engine comprises a plurality of cooling fins provided on outer surfaces of a cylinder block and a cylinder head, and vibration control rubbers interposed between cooling fins that face each other so as form a cooling air guide which guides air flow along lateral sides of the engine to rear parts of the engine. The cooling unit significantly increases the cooling efficiency of a cylinder and prevents vibration of cooling fins by interposing vibration control rubbers between cooling fins that face each other. The vibration control rubbers are formed in a streamlined shape and direct the flow of traveling air within the cooling fins about the exterior surface of the engine. The arrangement of the vibration control rubbers on side surfaces of the engine is such that angle alpha of longitudinal axes of the vibration control rubbers with respect to the advancing direction of the vehicle becomes gradually larger moving from the front to the rear of the engine.