Patent ID: 7261080

Claim:
An oil cooling system of an air-cooled engine for cooling the engine oil reserved in a crankcase of said engine, said cooling system comprising: a base plate assembled to said crankcase; an overlapping plate assembled to said base plate; an oil filter supported in said overlapping plate; and radiation fins formed on said base plate and said overlapping plate, wherein said base plate includes an inlet port for receiving the engine oil discharged from an oil pump of the engine, an outlet groove for outputting the engine oil and a first passage groove connecting said inlet port and said outlet groove, said overlapping plate includes an inlet groove opposed to said inlet port, an outlet port opposed to said outlet groove and a second passage groove opposed to said first passage groove to form an oil passage together with said first passage groove, said base plate and said overlapping plate having through-holes where the filter outlet of said oil filter passes through for the connection with said crankcase, and said base plate and said overlapping plate include a plurality of air holes in the thickness direction so as to pass the wind through said air holes.