Pistons and Oil-Trapping Rings for Maintaining an Oil Seal

PROVISION is made, in the piston and rings described by the author, for an adequate flow of heat from all parts of the piston-head to the cylinder-wall by means of adequate cross-section of aluminum alloy in the head and a tongue-and-groove type of piston-ring structure which provides a greater amount of surface than is usual for heat transfer. A labyrinth oil-seal is provided which aids heat transference and prevents leakage past the piston-rings, and the heat transfer is said to be such that the heat does not destroy the oil seal between the piston and the ring.

Charts are included that show the effects in reduced temperatures, oil consumption and gas leakage with the construction described.

Attention is given also to a skirt construction most suitable to use with the piston-head and rings described.