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:
Nov. 30, 1999
Filed:
Apr. 16, 1998
Applicant:
Inventors:
Assignee:
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ;
U.S. Cl.
CPC ...
29888042 ; 29888044 ;
Abstract
In a method of manufacturing the piston, a first block including first alloy and a second block including a second alloy are press-forged to form a piston. The piston has a head and a skirt, with the head including at least a portion of the first alloy and the skirt including at least a portion of the second alloy. The first alloy preferably including an aluminum-iron based alloy, and the second alloy preferably comprises an aluminum-silicon based alloy. Preferably, during the forging process an interface between the blocks is increased in length or area, whereby oxide layers on the blocks are destroyed and the material comprising the two alloys is bonded directly.