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Internal combuston engine having separated cylinder head oil drains and crankcase ventilation passages

United States Patent

5,852,992
December 29, 1998
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
An internal combustion engine includes separated oil drain-back and crankcase ventilation passages. The oil drain-back passages extend from the cylinder head to a position below the top level of oil in the engine's crankcase. The crankcase ventilation passages extend from passages formed in the main bearing bulkheads from positions above the oil level in the crankcase and ultimately through the cylinder head. Oil dams surrounding the uppermost portions of the crankcase ventilation passages prevent oil from running downwardly through the crankcase ventilation passages.
Boggs; David Lee (Bloomfield Hills, MI), Baraszu; Daniel James (Plymouth, MI), Foulkes; David Mark (Erfstadt, DE), Gomes; Enio Goyannes (Ann Arbor, MI)
Ford Global Technologies, Inc. (Dearborn, MI)
08/ 976,940
November 24, 1997
GOVERNMENT RIGHTS This invention was made with Government support under NREL Subcontract NO. ZCB-4-13032-02 Prime Contract No. DE-AC36-83CH10093 awarded by the Department of Energy. The Government has certain rights in this invention.