US 12,292,013 B2
Piston assembly with gapless oil control ring
Graydon Robert Hegge, Madison, WI (US); Aaron Gamache Foege, Kansasville, WI (US); and Frank Matthew Graczyk, Darien, IL (US)
Assigned to DeltaHawk Engines, Inc., Racine, WI (US)
Filed by DeltaHawk Engines, Inc., Racine, WI (US)
Filed on Jun. 29, 2023, as Appl. No. 18/343,909.
Claims priority of provisional application 63/356,710, filed on Jun. 29, 2022.
Prior Publication US 2024/0003314 A1, Jan. 4, 2024
Int. Cl. F02F 5/00 (2006.01); F02B 75/02 (2006.01); F02F 3/00 (2006.01)
CPC F02F 5/00 (2013.01) [F02B 75/02 (2013.01); F02F 3/0015 (2013.01); F02B 2075/025 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An inverted V-block, two-stroke engine, comprising:
a crankcase;
a cylinder coupled to the crankcase, the cylinder extending along and centered on an axis;
a piston extending along and centered on the axis, the piston comprising:
a piston head; and
a piston skirt extending between the piston head and the crankcase, the piston skirt having a first end and a second end opposite the first end, the second end adjacent to the crankcase; and
a ring assembly coupled to an exterior of the piston skirt at the second end, the ring assembly comprising:
a rail extending circumferentially around the axis and comprising a first circumferential end and a second circumferential end opposite the first circumferential end, and a notch extending along the rail between the first circumferential end and the second circumferential end, the rail defining a rail gap between the first circumferential end and the second circumferential end;
an annular ring coupled to the rail and positioned such that the annular ring is received in the notch of the rail, the annular ring extending circumferentially around the axis and defining a ring gap within the annular ring; and
wherein the rail gap and ring gap are circumferentially spaced apart from each other such that the ring gap is not aligned with the rail gap in a direction parallel to the axis.