Title:
内燃機関用ピストン
Document Type and Number:
Japanese Patent JP7344460
Kind Code:
B2
Abstract:
To provide a piston for an internal combustion engine capable of further reducing a blow-by gas flow rate and the number of particles of discharged particles, allowing surface roughness of an anodic oxide film to the blow-by gas flow rate to be evaluated accurately, and capable of stably forming the smooth anodic oxide film.SOLUTION: A piston for an internal combustion engine includes a top ring groove on its outer peripheral surface. An anodic oxide film 26 is provided on an inner surface in a region with which a top ring comes in contact, which is the inner surface at least on a second ring groove side of the inner surface of the top ring groove. The anodic oxide film 26 is a direct current electrolytic film 22, and has, on its surface, a hole in which growth of an anodic oxide film is blocked by silicon 16. The anodic oxide film includes a sealing part 25 in which the hole is filled with powder of the anodic oxide film. Surface roughness Rpk according to JIS B0671-2 of the anodic oxide film 26 is 1.00 μm or less.SELECTED DRAWING: Figure 5
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Inventors:
Haruhiko Murakami
Shinya Masuhara
Tomohiro Nishiwaki
Shinya Masuhara
Tomohiro Nishiwaki
Application Number:
JP2019112095A
Publication Date:
September 14, 2023
Filing Date:
June 17, 2019
Export Citation:
Assignee:
Suzuki Motor Corporation
International Classes:
F02F3/00; C25D11/04; F02F3/10; F16J9/00
Domestic Patent References:
| JP2017160533A | ||||
| JP2007232026A | ||||
| JP9019757A | ||||
| JP6026571A | ||||
| JP5017899A | ||||
| JP9159022A | ||||
| JP2015206104A | ||||
| JP2009235539A |
Foreign References:
| US6425364 | ||||
| DE102018127700A1 |
Attorney, Agent or Firm:
Shoichi Okuyama
Tetsuo Matsushima
Ayako Nakamura
Soji Morimoto
Yu Tanaka
Koichi Tokumoto
Kohei Arihara
Tetsuo Matsushima
Ayako Nakamura
Soji Morimoto
Yu Tanaka
Koichi Tokumoto
Kohei Arihara