F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
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F02B 37/00 (2006.01) F02B 3/00 (2006.01) F02B 33/00 (2006.01) F02B 77/04 (2006.01) F16J 9/00 (2006.01) F16J 15/40 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1265004
CLEAN AIR BLOW BY SYSTEM FOR DIESEL ENGINE ABSTRACT OF THE DISCLOSURE An improved diesel engine is provided wherein clean air is blown past compression ring seals to prevent particulate matter in combustion gases from entering between a cylinder wall or liner and a piston sidewall. The diesel engine includes at least one cylinder, a piston reciprocatingly mounted in the cylinder, a combustion air port, an exhaust gas port, a fuel injector proximate the cylinder head, and at least two compression ring seals. A clean air port communicates with the cylinder wall for conducting pressurized clean air into the cylinder. A chamber is disposed in the piston and includes a port substantially centered on the piston crown, and a blow-by port on the piston sidewall bounded by the two compression ring seals. The clean air port is spaced from the combustion air port such that when the piston is proximate the bottom-dead-center position of its stroke and combustion air is conducted into the cylinder, the compression ring seals bounding the blow-by port also bound the clean air port. Thus, during this low-compression portion of the piston stroke the pressurized clean air fills the piston chamber and is thence conducted into the cylinder. When the piston is proximate its top-dead-center position during the compression and firing strokes, this clean air is compressed and blown past the compression rign seals, thereby preventing combustion products and any particulate matter situated therein frompssing by the seals and abrading the cylinder liner or piston sidewall.
523570
Company General Electric
Eckersley Raymond A.
Leonard Gary L.
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