Internal-combustion engines – Crankcase ventilation
Patent
1997-09-08
1999-03-16
Kwon, John T.
Internal-combustion engines
Crankcase ventilation
123574, F01M 1300
Patent
active
058816860
ABSTRACT:
A crankcase breather valve for ventilation and pressure control within the crankcase of an internal combustion engine in which pistons stroke upwardly and downwardly in a synchronous movement. The valve is inserted into a breather hose which conducts gases into and out of the crankcase. The valve comprises a resilient valve member, preferably an elastomeric umbrella-type seal, spaced above a seal seat and forming a gap therebetween through which gases may flow either direction during portions of the pistons' stroke cycle. The valve construction permits three operating modes: firstly to permit the egress of positive pressure gas out of the crankcase and through the gap while the pistons stroke downwardly; secondly, to permit the ingress of a small amount of gas back through the gap into the crankcase when the crankcase pressure changes from positive to negative; and thirdly to check further ingress of gas into the crankcase at greater crankcase suctions, developed when the piston's are moving upwardly.
REFERENCES:
patent: 3051151 (1962-08-01), Hewlig
patent: 4169432 (1979-10-01), White
patent: 5027784 (1991-07-01), Osawa et al.
patent: 5067449 (1991-11-01), Bonde
patent: 5205243 (1993-04-01), Buchholz
patent: 5507318 (1996-04-01), Israelson
D.L.S. Cycle Products, Inc.
Kwon John T.
LandOfFree
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