초록 ▼

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 co

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.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A crankcase ventilation system for an internal combustion engine having a crankcase defining a volume containing gases and having two or more cylinders extending from the crankcase

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A crankcase ventilation system for an internal combustion engine having a crankcase defining a volume containing gases and having two or more cylinders extending from the crankcase, the bores of the cylinders being contiguous with the crankcase, the cylinders having two or more pistons movable therein, the system comprising:pistons which move simultaneously inwardly and simultaneously outwardly from the crankcase during one piston cycle of normal engine operation, so that when moving inwardly, the volume of crankcase is caused to decrease with a resulting increase in pressure, and when moving outwardly, the volume of the crankcase is increased with a resulting decrease in pressure;a breather hose having one end connected to the crankcase for flowing gases between the crankcase and atmosphere; andvalve means located within the breather hose, said valve means being operative between three modes during one piston cycle,firstly to release buildup of pressure in the crankcase which becomes positive, being pressure greater than atmospheric, by flowing gas out of the crankcase, through the breather hose and through the valve means,secondly to permit a small amount of gas to flow into the crankcase through the breather hose and valve means as the pressure in the crankcase changes from positive to negative, andthirdly to block further ingress of gas into the crankcase as the pressure continues to become more negative so that pressure in the crankcase becomes negative.