Engine breather assembly with oil drain back

Details Engine breather assembly with oil drain back Engine breather assembly with oil drain back

1988-11-14

1989-12-12

Kamen, Noah P.

Internal-combustion engines

Crankcase ventilation

123574, 55420, 55DIG19, F01M 1300

Patent

active

048860190

ABSTRACT:
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.

REFERENCES:
patent: 2493617 (1950-01-01), Chubbuck
patent: 3087474 (1968-04-01), Catha
patent: 3550567 (1970-12-01), Crow
patent: 3721069 (1973-03-01), Walker
patent: 3875916 (1975-04-01), Patton
patent: 4579092 (1986-04-01), Kandler

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