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. 15, 2008
Filed:
Sep. 21, 2006
Akito Tanihata, Wako, JP;
Naoko Sato, Wako, JP;
Hisayasu Kojima, Wako, JP;
Kouji Katsumata, Wako, JP;
Takashi Shiraishi, Wako, JP;
Akito Tanihata, Wako, JP;
Naoko Sato, Wako, JP;
Hisayasu Kojima, Wako, JP;
Kouji Katsumata, Wako, JP;
Takashi Shiraishi, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A piston for internal combustion engine has both fatigue strength and wear resistance without increased production cost. At least one of a combustion chamber surface, a skirt rib, a pin boss rib which connects a pin boss and a crown, a lower portion of the pin boss casting surface, and a surface layer including the casting surface is a first eutectic structure in which primary crystal Si does not crystallize. A top ring groove and a pin holing of a piston pin are finished surfaces obtained by eliminating the surface layer by means of machining. The layer including the finished surface is a second eutectic structure in which the primary crystal Si crystallizes.