Patent ID: 8997699
Filing Date: 2015-04-07
Classification: F02B

Abstract:
1. A free piston combustion engine with indirect work extraction via gas linkage, comprising: a cylinder with curved ends with two opposed free pistons disposed therein that form a combustion section in a center of the cylinder, each free piston comprising a front face facing the combustion section and a back face facing the opposite direction, wherein the free pistons are free from mechanical linkages external of the cylinder; two opposed extractor pistons, each extractor piston disposed in its own cylinder at opposite ends of the free piston cylinder, each extractor piston comprising a front face facing the combustion section and a back face facing the opposite direction; and two gas linkages, each gas linkage comprising a volume sealed between the back face of a free piston and the front face of an extractor piston; wherein each extractor piston is connected to a single rotary electromagnetic machine.