Patent ID: 6948459
Filing Date: 2005-09-27
Classification: F02B

Abstract:
1. A free piston engine comprising: an energy generation and control assembly having a first side, a second side in opposed relation to the first side, and an inner position sensor; a first combustion cylinder assembly located adjacent to the first side and including a first cylinder liner having a generally cylindrical wall that defines a first engine cylinder, which is centered about an axis of motion; a second combustion cylinder assembly located adjacent to the second side and including a second cylinder liner having a generally cylindrical second wall that defines a second engine cylinder, which is centered about the axis of motion; an inner piston assembly having a first inner piston that is located and telescopically slidable within the first engine cylinder and has a head portion that faces away from the first side, a second inner piston that is located and telescopically slidable within the second engine cylinder and has a head portion that faces away from the second side, and a push rod, which is centered about the axis of motion, including a first end affixed to the first inner piston, a second end affixed to the second inner piston and a middle portion that operatively engages the energy generation and control assembly; and a first guide rod, spaced from the push rod, having a first end affixed to the first inner piston, a second end affixed to the second inner piston, and a middle portion that includes an inner position sensor index that operatively engages the inner position sensor.