LOW EMISSION FUEL EFFICIENT DIESEL LOCOMOTIVE ENGINE INCLUDING A PISTON HAVING A TOROIDAL SURFACE.

摘要

A diesel locomotive engine having a piston with a unique bowl geometry. The bowl is defined in part by a center portion having a partial spherical shape. A cone portion ( 22 ) is located adjacent the central portion. An annular toroidal surface ( 24 ) is connected to the cone portion ( 22 ) and is defined by a toroidal major diameter (Dtm) and a toroidal minor radius (Rtm). A crown rim ( 26 ) is connected to the annular toroidal surface ( 24 ) and to an upper flat rim face of a sidewall.