Cylinder head of an air cooled internal combustion engine

Claim 1

A cylinder head for an air-cooled internal combustion engine with additional oil cooling of only those places which are particularly subjected to thermal loads in order to equalize large temperature differences in the cylinder head, characterized by an oil-cooling system, providing for the continuous flow of cooling oil, which includes wall means forming on the inside of the cylinder head an enclosed hollow space located only in those parts of the cylinder head that are particularly subjected to thermal loads, cooling surface means provided on the inside of said hollow enclosed space, said cooling surface means defining a flow passage with an upstream and a downstream end for the flow of the cooling oil, injection means for injecting cooling oil from the upstream end against the cooling surface means and projecting into the enclosed hollow space, and discharge channel means connected to said enclosed hollow space near the bottom thereof and in the downstream continuation of the flow passage defined by said cooling surface means to enable a continuous orderly and directed flow of the injected oil through said flow passage in heat-exchange relation with said cooling surface means into the discharge channel means to remove the heat from said cooling surface means by the heated continuous oil flow carrying off the heat through the discharge channel means.