The patent represents new concept in designing linear free piston engine with generator which in basic has four-stroke engine, integrated with generator and electric energy as an output. It is designed to satisfy the highest utilization of fuel, low exhaust emission performance in a compact size for use in hybrid electric vehicles (HEVs). The two cylinders with a common axis are set pistons having a work surface on the front and back side of piston. Connecting rods are directly connected with the mov
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