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. 14, 2012
Filed:
Sep. 11, 2008
Atsushi Kondoh, Maebashi, JP;
Osamu Tanaka, Maebashi, JP;
Shoji Kanai, Ueda, JP;
Takaaki Komatsu, Ueda, JP;
Atsushi Kondoh, Maebashi, JP;
Osamu Tanaka, Maebashi, JP;
Shoji Kanai, Ueda, JP;
Takaaki Komatsu, Ueda, JP;
Riken Forge Co., Ltd, , JP;
Art Metal Mfg. Co., Ltd., , JP;
Abstract
A method is provided for producing a piston for an internal-combustion engine of the structure in which a piston body which is composed of a crown having a groove for fitting a piston ring into an outer circumference surface and a skirt in connection with the bottom of the crown is provided with an annular cavity for flowing cooling liquid on an inside of the groove, the method comprising the steps of: forming the crown and the skirt individually; forming an annular groove for the annular cavity in the inner bottom of the crown and an annular rib in connection with the open edge of the annular groove before the crown and the skirt are joined together; bending the rib toward the opening of the annular groove by application of pressure to close the opening of the annular groove to thereby form the annular cavity; and joining the crown and the skirt together.