Compression piston ring for an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorRickey L. Williams
Life of this patent
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Abstract
A compression ring for an engine piston includes an upper and lower face, and an inner face positioned between the upper and lower faces along an inner diameter of the ring. An outer face is positioned between the upper and lower faces along an outer diameter of the ring and is formed by a continuous curve along the axial direction of the ring. The continuous curve has first and second convex surfaces connected by a concave surface with each convex surface defined by first and second radii, respectively. A method of forming a piston compression ring includes machining an outer face of the ring to form a continuous curve along an axial direction of the ring, where the continuous curve has a first convex section and a second convex section connected by an intermediate section.
Claims19
A compression ring for an engine piston comprising:
- an upper face and a lower face;
- an inner face positioned between the upper and lower faces along an inner diameter of the ring, wherein the upper face, the lower face, and the inner face cooperate with an annular groove in the piston;
- and
- an outer face positioned between the upper and lower faces along an outer diameter of the ring for cooperation with a bore in a cylinder, the outer face formed by a smooth continuous curve along an axial direction of the ring, the curve having first and second convex surfaces connected by a concave surface;
- wherein a first radius of the first convex surface is equal to a second radius of the second convex surface;
- and
- wherein the concave surface has a third radius, the third radius being less than half of the first radius.
A piston assembly for an engine comprising:
- a piston having a crown and a side forming an annular groove;
- and
- a compression ring received within the groove and having an outer face formed by a smooth continuous curve, the outer face having first and second convex surfaces connected by a concave surface, each convex surface having a first radius of curvature more than twice a second radius of curvature of the concave surface.
A method of forming a piston compression ring comprising forming an outer face of the ring with a smooth continuous curve along an axial direction of the ring, the continuous curve having a first convex section and a second convex section connected by a concave section, each convex section defined by a first radius of curvature, the concave section defined by a second radius of curvature being less than half the first radius of curvature.
Dependencies are inferred from the claim text.