The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2006
Filed:
Jul. 23, 2002
Shigeru Yanagimoto, Kitakata, JP;
Masashi Fukuda, Kitakata, JP;
Masahiro Sato, Kitakata, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A forged piston for an internal combustion engine formed from an aluminum alloy containing silicon in an amount of 6 to 25 mass %, includes an oil ring groove section () and a skirt section (). The ratio (A/B) of the average size (A) of eutectic silicon grains contained in the oil ring groove section to the average size (B) of eutectic silicon grains contained in the frontal end portion () of the skirt section is at least 1.5. The average size (A) is at least 4 μm. With the configuration such that the average size (B) is small and that the average size (A) is large, the skirt section exhibits excellent forgeability and the oil ring groove section exhibits reliable mechanical workability and improved wear resistance.