Liner for auxiliary combustion chamber

Claim 1

In an internal combustion engine, the combination of: walls including a movable piston forming a main combustion chamber, walls forming a cavity for an auxiliary combustion chamber, means forming a torch opening establishing communication between said chambers, said auxiliary chamber including a thin wall metallic cup of low heat capacity, said cup being cylindrical in shape and having an upper end open and a lower end closed by a hemispherical wall, said cylindrical and hemispherical portions of the cup being mounted within but spaced from the walls of said cavity, said cup having a first aperture offset laterally from the axis of the cylindrical cup and forming at least a part of said torch opening, a spark plug having electrodes positioned in said auxiliary chamber and outside said metallic cup, said cup having a second aperture on the opposite side of said cylindrical axis from the first aperture, said apertures each being large as compared to the thin wall of said cup, said second aperture establishing communication between said spark plug electrodes and the interior of the cup, said hemispherical end of the cup below both of said apertures serving as a fuel trap to collect any liquid fuel droplets.