US 12,291,993 B1
Two stroke charge piston engine
Joseph Springer, Montclair, CA (US)
Filed by Joseph Springer, Montclair, CA (US)
Filed on Dec. 4, 2024, as Appl. No. 18/968,555.
Int. Cl. F02B 75/02 (2006.01); F02B 25/26 (2006.01); F02B 33/04 (2006.01)
CPC F02B 75/02 (2013.01) [F02B 25/26 (2013.01); F02B 33/04 (2013.01); F02B 2075/025 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A two stroke engine comprising: an engine block; a crankshaft supported to rotate in the engine block; a cylinder head attached to the engine block; a charge piston cylinder attached to the cylinder head; a power piston cylinder attached to the cylinder head; a charge piston connected to the crankshaft and residing in the charge piston cylinder; a charge piston volume in the charge piston cylinder between the charge piston and the cylinder head; a power piston paired with the charge piston and connected to the crankshaft and residing in the power piston cylinder; the charge piston and the power piston reaching Bottom Dead Center (BDC) at the same time; a power piston volume in the power piston cylinder between the power piston and the cylinder head; a throttle body in fluid communication with the charge piston volume through the cylinder head; cylinder head valving between the throttle body and the charge piston volume, the valving configured to allow air to flow from the throttle body into the charge piston volume during a charge piston intake stroke and restrict air from flowing from the charge piston volume into the throttle body during a charge piston compression stroke; a chamber inside the charge piston in fluid communication with the charge piston volume; chamber valving between the chamber and the charge piston volume, the chamber valving configured to allow air to flow from the charge piston volume into the chamber and restrict air from flowing from the chamber into the charge piston volume; a charge piston charge passage in the charge piston; a charge piston cylinder port in the charge piston cylinder; a power piston charge passage in the power piston; a power piston cylinder port in the power piston cylinder; the chamber in fluid communication with the power piston volume through the charge piston charge passage, the charge piston cylinder port, the power piston charge passage and the power piston cylinder port when the charge piston and the power piston are at BDC; and an ignition device attached to the cylinder head to ignite fuel in the two stroke engine.