Method for producing piston ring with recess
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United States of America Patent
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Jun 29, 2021
Grant Date -
Mar 12, 2020
app pub date -
Nov 15, 2019
filing date -
Nov 30, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method for producing a piston ring for a cylinder that moves in a sliding direction includes providing a piston ring base material having an upper surface, a lower surface and an outer circumferential surface having a first recess between the upper surface and the lower surface, forming a hard film in the first recess and on a cylindrical surface at a predetermined thickness, and removing, by performing a polishing process on the sliding surface, the hard film formed on the cylindrical surface and a part of the piston ring base material disposed adjacent to the removed hard film, to form a second recess. The second recess is formed by removing an area of the removed part of the piston ring base material as a result of polishing the sliding surface due to a difference in the hardness of the hard film and the piston ring base material.
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