Patent ID: 7409931
Filing Date: 2008-08-12
Classification: F01P,F02B,Y02T

Abstract:
1. A forced-air-cooled engine equipped with a cooling air guide cover, the engine having a cylinder block which comprises: a crankcase part and a cylinder part connected into one block; a cooling fan being attached to an end of a crankshaft of the engine; a fan cover arranged so as to cover said cooling fan; a main blow-out opening being provided at a back plate of said fan cover at a position facing said cylinder part for blowing out cooling air for cooling said cylinder part; and a secondary blow-out opening being provided at said back plate at a position opposite to said main blow-out opening with respect to a crankshaft center for cooling a part of said crankcase part, wherein said cooling air guide cover is comprised of a cylinder air-guide cover part which guides air blown out from said main blow-out opening to flow so as to cool said cylinder part, and a top cover part which guides air blown out from said secondary blow-out opening to flow along a side face of said crankcase part so as to cool said side face of said crankcase part and then to flow into the flow of air from said main blow-out opening which cools said cylinder part.