Patent ID: 9689259
Date: 2017-06-27
CPC Classifications: F01B,F01L,F01N,F02B,F02F,F02M,F16J

Claim:
1. A linear reciprocating engine, comprising: a cylinder having a first combustion chamber at a first end thereof and a second combustion chamber at an opposing second end thereof; a plurality of exhaust ports in the cylinder; a first cylinder head located at an end of the first combustion chamber; a second cylinder head located at an end of the second combustion chamber; a double-faced piston slidably mounted within the cylinder and configured to move in a first stroke from the first end of the cylinder to the second end of the cylinder, wherein the double-faced piston and the cylinder are configured such that the first stroke includes a first expansion stroke portion during which chemical energy from combustion in the first combustion chamber is converted into mechanical power of the piston, and a first momentum stroke portion during which the piston continues to move to the second end of the cylinder and gases are exchanged between the first combustion chamber and a location outside the cylinder; and wherein the cylinder and the double-faced piston are sized such that the double-faced piston moves past all of the plurality of exhaust ports, and such that a first total distance the piston travels beyond the plurality of exhaust ports during the first stroke exceeds a first distance the piston travels during the first expansion stroke portion of the stroke by at least a length of the piston from a first face to an opposite second face of the piston.