Balancing crankcase pressure

Details Balancing crankcase pressure Balancing crankcase pressure

1997-07-31

1998-11-03

Kwon, John T.

Internal-combustion engines

Frame construction

Horizontal cylinder

123195H, F02F 700

Patent

active

058294066

ABSTRACT:
An engine assembly is disclosed which includes a cylinder block having cylinders, pistons disposed in the cylinders, and connecting rods connecting the pistons to a crankshaft. The crankshaft rotates to move the pistons reciprocally in the cylinders thereby inducing volumetric changes within the engine and, particularly between axially adjacent pistons. A crankcase disposed below the cylinder block has axial sidewalls extending therefrom to define a crankcase volume in which the crankshaft is disposed for rotation. Crankcase bulkheads extend laterally to connect the axial walls and define cylinder bays therebetween. Each of the crankcase bulkheads includes a crankshaft journal support and a surface configured to rotatably receive a complementary bearing cap for support of the crankshaft therebetween. The sidewalls include outwardly relieved portions at the intersection of the bulkheads with the crankcase sidewalls to define openings around the bearing caps to allow airflow, induced by the volumetric changes, between the cylinder bays.

REFERENCES:
patent: 4729352 (1988-03-01), Fukuo et al.
patent: 5107809 (1992-04-01), Suh
patent: 5579729 (1996-12-01), Batzill et al.

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