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:
Aug. 06, 2002
Filed:
Jul. 28, 2000
Applicant:
Inventor:
Masato Sasaki, Kanagawa, JP;
Assignee:
Unisia Jecs Corporation, Atsugi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21K 1/18 ; F16J 1/04 ;
U.S. Cl.
CPC ...
B21K 1/18 ; F16J 1/04 ;
Abstract
A piston of an internal combustion engine comprises a crown portion constructed of an aluminum alloy. The crown portion has a bowl in a top surface thereof. The bowl serves as a combustion chamber. Boss portions are projected downward from the crown portion. The boss portions have aligned piston pin holes respectively which have a common axis. A generally annular reinforced zone is provided on the top surface of the crown and extends around a peripheral edge of the bowl. The mechanical strength of the reinforced zone gradually lowers as the distance from the common axis increases.