Structure of piston ring
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United States of America Patent
Stats
-
Jun 16, 2015
Grant Date -
Nov 20, 2014
app pub date -
Aug 4, 2014
filing date -
Jun 19, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A structure of a piston ring to be installed in an engine includes a matrix. A laminated intermediate layer is formed on a surface of the matrix from hard chromium (Cr), chromium nitride (CrN) and titanium carbide (TiC) in order, and a diamond-like carbon film (DLC) is coated on an outer periphery of the intermediate layer. Thus, the piston ring is wrapped by a skin with a progressive structure having a gradient distribution of hardness. The structure formed from the diamond-like carbon film provides a low wear rate and a low friction coefficient, while applying a high bonding force to the matrix and making the piston ring have an improved normal service life that meets the related environmental regulations.
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Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- C23C Class
- 13.95 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 16, 2026 |
