Patent ID: 7255065
Filing Date: 2007-08-14
Classification: F01C

Abstract:
1. A piston for an internal combustion engine, said piston being constrained to have a rocking motion about a pivot axis, said piston comprising: a pivot shaft having a pivot axis; a first arcuate sealing surface transcribing a first circumferential path about the pivot axis; a seal bed; a second arcuate sealing surface radially offset from said first sealing surface and transcribing a second circumferential path about the pivot axis, said second arcuate sealing surface including at least two components located contiguously on said seal bed, said components having contiguous edges forming mating edges to allow said components to have independent transverse movement on said seal bed and restrict the path of combustion gases between the mating edges; a floor extending substantially radially between said first arcuate sealing surface and said second arcuate sealing surface; and a coolant path for liquid coolant formed in the piston, said coolant path comprising a pivot shaft path extending through said pivot shaft, and piston cooling galleries in the piston.