Back to results
US 2018/0023703 A1Published application
Piston ring and manufacturing method
AssigneeGM Global Technology Operations LLC
InventorsRonald J. PETRUS, Zheng MA, Qigui WANG
Life of this patent
Estimating the term…
Abstract
A piston ring includes a generally circular open ring having a generally cylindrical outer diameter surface and an inner diameter surface having a plurality of radially outwardly extending arcuate recesses. A method of making the piston ring includes extruding a rectangle cross-section steel wire to include at least two recesses in a side edge thereof. The extruded steel wire is wound in a ring-shape with the arcuate recesses being on an inner diameter surface of the wound ring.
Claims16
A piston ring, comprising:
- a generally circular open ring having a generally cylindrical outer diameter surface and an inner diameter surface having a plurality of radially outwardly extending arcuate recesses.
A method of making a piston ring, comprising:
- extruding a rectangle cross-section steel wire to include at least four recesses in a side edge thereof;
- and
- winding the extruded steel wire in a ring-shape with the arcuate recesses being on an inner diameter surface of the wound ring.
Dependencies are inferred from the claim text.