US 12,292,013 B2Granted

Piston assembly with gapless oil control ring

AssigneeDeltaHawk Engines, Inc.

InventorsGraydon Robert Hegge, Aaron Gamache Foege, Frank Matthew Graczyk

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Abstract

A piston is provided with a gapless ring positioned in a subport position. Specifically, the gapless ring is positioned between the air ports and the crankcase of the engine. The gapless ring includes a rail and an annular ring received within the rail. The ring includes a ring gap and the rail includes a rail gap. When the rail receives the annular ring, the ring gap and rail gap are spaced apart in a circumferential direction such that the gaps do not overlap. In certain embodiments, the rail includes a notch. When the annular ring is received within the notch, the annular ring and rail are biased against rotating with respect to each other. In certain other embodiments, the gapless ring includes an oil scraping surface.

Claims20

Dependent claims

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.

9 more elements

Dependencies are inferred from the claim text.