US 12,129,810 B2
System and method for deburred port holes in a two-stroke engine
Robert G. Sperry, Columbus, IN (US); Jordan E. Kelleher, Columbus, IN (US); Jeffrey A. Wheitner, Columbus, IN (US); Jeffrey D. Olmstead, Columbus, IN (US); Myron T. Rickard, Seymour, IN (US); and David J. Eckroth, Columbus, IN (US)
Assigned to Cummins Inc., Columbus, IN (US); and ACHATES POWER INC., San Diego, CA (US)
Appl. No. 18/034,237
Filed by Cummins Inc., Columbus, IN (US)
PCT Filed Oct. 8, 2021, PCT No. PCT/US2021/054120
§ 371(c)(1), (2) Date Apr. 27, 2023,
PCT Pub. No. WO2022/108679, PCT Pub. Date May 27, 2022.
Claims priority of provisional application 63/107,895, filed on Oct. 30, 2020.
Prior Publication US 2023/0399994 A1, Dec. 14, 2023
Int. Cl. F02F 1/22 (2006.01); F02B 75/28 (2006.01); F02B 75/02 (2006.01)
CPC F02F 1/22 (2013.01) [F02B 75/28 (2013.01); F02B 2075/025 (2013.01); F02F 2200/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for forming an engine block for a two-stroke engine, comprising:
casting the engine block, wherein the cast engine block includes at least one intake port and at least one exhaust port;
rough machining a cylinder of the engine block, wherein at least one of the at least one intake port and the at least one exhaust port is positioned along a wall of the cylinder and both of the at least one intake port and the at least one exhaust port are fluidly coupled to the cylinder; and
finishing an edge of at least one of the at least one intake port and the at least one exhaust port to provide a smooth surface;
wherein the finishing the edge of at least one of the at least one intake port and the at least one exhaust port to provide the smooth surface includes tracing a curvature of an existing port hole for the at least one intake port and the at least one exhaust port.