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. 30, 2016
Filed:
Jan. 21, 2013
Mitsubishi Heavy Industries Machine Tool Co., Ltd., Ritto-shi, Shiga, JP;
Yoshimura Company, Nagoya-shi, Aichi, JP;
Hirokazu Morii, Tokyo, JP;
Kenichiro Hirao, Tokyo, JP;
Katsumi Nakamura, Tokyo, JP;
Hyoji Yoshimura, Nagoya, JP;
Fuji Hollow Valve Inc., Shizuoka, JP;
Abstract
The present invention provides a method for producing a hollow engine valve, with which the production process can be simplified and the processing precision can be improved. To this end, the present invention provides a method for producing a hollow engine valve () which is provided with a valve main body () in which a hollow hole () is formed along a valve umbrella part () and a hollow shaft part (), wherein a solid round bar () forming the material of the valve main body () is molded to a semi-finished article () by means of a single hot-forging process, the semi-finished article () is subjected to rotary swaging whereby the semi-finished article () is molded into a semi-finished article (), the semi-finished article () is subjected to necking whereby the semi-finished article () is molded into the valve main body (), and a shaft end sealing member () is joined to the end part of the hollow shaft part () of the valve main body ().