Positive crankcase ventilation system for a two-cylinder engine

摘要

An engine assembly includes a two-cylinder engine, an intake assembly, and an air-oil separator. The two-cylinder engine defines a first cylinder bore, a first combustion chamber, a second cylinder bore, a second combustion chamber, and a crankcase volume. The engine further includes a first piston disposed within the first cylinder bore, and a second piston disposed within the second cylinder bore. The intake assembly includes an intake manifold in fluid communication with each of the first and second combustion chambers, and the air-oil separator defines a separator volume and in fluid communication with each of the crankcase volume and the intake manifold. A reciprocal, synchronous motion of the first and second pistons is operative to exhale gas from the crankcase volume through the separator volume and into the intake manifold.

主权项

1. An engine assembly comprising:
a two-cylinder engine defining a first cylinder bore, a first combustion chamber, a second cylinder bore, a second combustion chamber, and a crankcase volume, the engine further including a first piston disposed within the first cylinder bore, and a second piston disposed within the second cylinder bore; an intake assembly including an intake manifold, the intake manifold being in fluid communication with each of the first and second combustion chambers; and an air-oil separator defining a separator volume and in fluid communication with each of the crankcase volume and the intake manifold; wherein the assembly is configured such that a reciprocal, synchronous motion of the first and second pistons are operative to actively exhale gas from the crankcase volume through the separator volume and into the intake manifold; wherein the intake assembly further includes an air cleaner assembly, and a throttle; wherein the air cleaner assembly, the throttle, the intake manifold, and each of the first and second combustion chambers are disposed in a series arrangement; wherein the throttle is configured to selectively restrict air flow from the air cleaner assembly to the intake manifold; wherein the crankcase volume is fluidly coupled with the air cleaner assembly; wherein a pressure differential between the air cleaner assembly and the intake manifold is operative to draw gas from the crankcase volume through the separator volume and into the intake manifold.