Engine breather assembly with oil drain back

摘要

A breather assembly for a combustion engine which conserves oil by condensing oil vapors from the engine and returning the oil to the crankcase. The breather assembly is mounted to the crankcase cover and includes a drain tube extending into a low pressure area of the crankcase. The breather includes a baffled interior chamber with an inlet opening at its lower end having a valving mechanism biased towards the closed position. Vapor travels through the valve into the chamber and over a baffle wall into an outer annulus. Breather holes at the bottom of the annulus allow gases to escape. Oil is condensed as the vapor travels up the inner chamber. A vacuum created by the crankcase through the drain back tube causes the condensed oil to flow back into the crankcase. In a preferred embodiment, the breather assembly is molded using a polyurethane material.