Patent ID: 7341027
Filing Date: 2008-03-11
Classification: F02B,F02F

Abstract:
1. A portable 4-cycle engine allowing cooling air to flow in a direction of a crankshaft, comprising: a cylinder; a cylinder head disposed on said cylinder, and including a combustion chamber at a side of said cylinder; an intake port and an exhaust port, said intake port and said exhaust port being oppositely formed with each other in said cylinder head in a direction orthogonal to said crankshaft; a cooling fan for introducing the cooling air to said cylinder head, said cooling fan being connected to an end of the crankshaft; a valve train area formed above said intake port and said exhaust port, said valve train area being connected to said intake port and said exhaust port with a pair of valve guide bosses; and a plurality of vertical fins protruding upwardly from said cylinder head and extending in the direction of said crankshaft, wherein: