Hoop spring in a pressure reactive piston
AssigneeFord Global Technologies, LLC
InventorJohn Edward Brevick
Life of this patent
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Abstract
Systems and methods are provided for varying a compression ratio in an engine having a pressure reactive piston. The pressure reactive piston may include a piston crown, and a spring positioned within the piston crown, wherein the spring includes a first ring, a second ring comprising a plurality of apertures, a rolling element positioned within each of the plurality of apertures, and a third ring. The first ring, the second ring, and the third ring of the spring may be arranged concentrically and the second ring may be positioned between the first ring and the third ring.
Claims14
A system, comprising:
- a piston crown;
- and
- a spring positioned within the piston crown, the spring including a first ring, a second ring comprising a plurality of apertures, a rolling element positioned within each of the plurality of apertures, and a third ring, wherein the first ring, the second ring, and the third ring are arranged concentrically with the second ring positioned between the first ring and the third ring.
A method, comprising:
- varying a compression ratio of an engine via a spring assembly located in a crown of a piston in a cylinder of the engine, the spring assembly comprising a third annular element fitted inside a second annular element, and a first annular element enclosing the second annular element, wherein the second annular element includes a plurality of apertures with a rolling element positioned within each of the plurality of apertures.
Dependencies are inferred from the claim text.