Patent ID: 6886523

Claim:
A pump system comprising: an internal combustion engine, said engine including a crankshaft and an engine housing, said crankshaft operably coupled to at least one piston, said engine housing having an engine housing interior surface defining and at least partially enclosing an engine space; a pump having a pump housing and a driving mechanism, said pump housing having a pump housing interior surface defining and at least partially enclosing a pump space; an integral first housing section defining a portion of both said engine housing and said pump housing, said first housing section having a first major surface and an oppositely disposed second major surface, said first major surface defining a portion of said engine housing interior surface and defining at least a portion of an oil sump disposed within said engine space and said second major surface defining a portion of said pump housing interior surface, said first housing section having a shaft opening extending through said first housing section from said first major surface to said second major surface; and a first bearing disposed within said shaft opening and engaged with said crankshaft, said crankshaft having a distal end projecting through said first housing section and a freely extending length disposed within said pump, said driving mechanism operably coupled with said freely extending length of said shaft and wherein bearing support for said crankshaft from proximate said first housing section to said distal end consists essentially of said first bearing; wherein said first housing section further defines at least one oil passage extending between said first and second major surfaces and providing fluid communication between said engine space and said pump space.