Internal-combustion engines – Valve – Rotary
Patent
1975-09-04
1978-08-08
Myhre, Charles J.
Internal-combustion engines
Valve
Rotary
123193P, 92181R, F02F 124
Patent
active
041050088
ABSTRACT:
An anti-pollution piston construction is disclosed containing at least one storage chamber having inlet orifices contained in the periphery of the cylindrical side wall of the piston adjacent the imperforate piston end wall, said storage chamber being adapted to receive unburnt hydrocarbons during the compression stroke of the engine. During the expansion stroke following ignition, the unburnt hydrocarbons are returned to the cylinder chamber for mixing with the combustion gases to reduce the oxides of nitrogen having an excess concentration relative to an equilibrium value which is a function of the temperature, pressure and composition parameters of the combustion gases. The unburnt hydrocarbons in the storage chamber are returned in a manner that displaces unburnt hydrocarbons from the relatively cold wall of the cylinder which further aids the reduction of the oxides of nitrogen. In one embodiment, a plurality of radially arranged circumferentially spaced storage chambers are provided in the cylindrical side wall of the piston. In another embodiment, a centrally arranged storage chamber is provided which communicates with the cylinder chamber via radially arranged circumferentially spaced passages having orifices in the periphery of the piston.
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Cornell Research Foundation Inc.
Feinberg Craig R.
Myhre Charles J.
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