PISTON RING AND MANUFACTURING METHOD
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United States of America Patent
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Jul 21, 2016
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Jul 21, 2016
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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.
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