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:
Jan. 21, 2020
Filed:
Jun. 13, 2017
Subaru Corporation, Tokyo, JP;
Yusuke Shirakawa, Tokyo, JP;
SUBARU CORPORATION, Tokyo, JP;
Abstract
A method for manufacturing a differential device includes a first step and a second step. The first step is to cast a differential case by pouring molten cast iron into, via a gate, a mold having, on a mold surface, a mark formation site that has a specific positional relationship to the gate. The second step is to fit the differential case with a ring gear and weld the differential case and the ring gear together entirely around a prescribed axis. In the second step, the differential case and the ring gear are welded together using a mark formed on the differential case by the mark formation site in the first step so that an overlap of welding does not occur in a portion of the differential case formed near the gate of the mold.