Piston and ring for reducing HC emissions

Details Piston and ring for reducing HC emissions Piston and ring for reducing HC emissions

1977-07-07

1979-05-15

Myhre, Charles J.

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

123 47R, 92183, 92185, 277 29, 277 73, F02F 328, F02F 500

Patent

active

041542070

ABSTRACT:
An internal combustion engine is provided with pistons having openings connecting the space behind one of the piston rings with the crankcase during certain portions of the operating cycle of the engine. This is accomplished by the use of a differential pressure control valve that vents the unburned hydrocarbons trapped behind the compression ring to the crankcase during periods when the pressure in the combustion chamber is at the lower values during the internal combustion engine operating cycle. These unburned hydrocarbons are, therefore, directed into the crankcase of the engine rather than being permitted to leak back into the combustion chamber and to be discharged into the atmosphere during the exhaust stroke of the engine.

REFERENCES:
patent: 1778200 (1930-10-01), Nibbs
patent: 2064969 (1936-12-01), Carr et al.
patent: 2459447 (1949-01-01), Milliken
patent: 2557039 (1951-06-01), Stewart
patent: 2653065 (1953-09-01), Appleton
patent: 2774619 (1956-12-01), Mercier
Quillian et al., "Crankcase-Diversion Tactics," SAE Journal, May, 1964, pp. 50-56.

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