Importance

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Abstract

An engine oil pan of the dry sump type is divided into inner and outer parts by a funnel-like baffle with a hole in the bottom, the hole being of a controlled vertical height, the outer part being an oil reservoir connected to the engine suction side of the engine positive crankcase ventilating (PCV) system, the inner part receiving the oil therein from the various engine parts and being connected to the fresh air inlet side of the PCV system, thereby, during normal engine operation, establishing a constant pressure differential across the baffle to force oil collected in the inner part through the hole into the outer part, the oil level in the inner part stabilizing at the level of the hole in the baffle, the oil in the outer part stabilizing at a level dependent upon the total quantity of oil in the system and the volume of the reservoir, thereby removing standing oil from the vicinity of the moving parts in the crankcase which reduces friction and aeration of the oil and yet provides an adequate supply of oil to the engine oil pump.

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First Claim