Title:
DIFFERENTIAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/002418
Kind Code:
A1
Abstract:
Provided is a differential device comprising a cast differential case, a differential gear mechanism accommodated in the differential case, and a machined part formed in the differential case by a machining operation after casting, wherein: an inner surface of the differential case has a gear support surface of the differential gear mechanism; a surface to be molded, which is formed with the same molding die (N) during casting of the differential case (3), includes an inner surface (3i) of the differential case (3) and the same die molded outer surface of the differential case (3), which is exposed to the outside; and a pinion gear support surface (9p) on the inner surface (3i) of the differential case (3) is a non-machined surface that is not machined even after casting the differential case (3). Accordingly, when the inner surface of the differential case is machined after the casting, a variation in the machining amount is reduced or a reduction in the machining amount is achieved. Furthermore, when a portion of the inner surface of the differential case serves as a non-machined surface for cost reduction, the accuracy of a relative position between the non-machined surface and the machined part can be improved.
Inventors:
NAGAO KOJI (JP)
MORI HIROYUKI (JP)
SUGIMURA TOMOAKI (JP)
SUHARA NAOHIRO (JP)
MORI HIROYUKI (JP)
SUGIMURA TOMOAKI (JP)
SUHARA NAOHIRO (JP)
Application Number:
PCT/JP2020/025977
Publication Date:
January 07, 2021
Filing Date:
July 02, 2020
Export Citation:
Assignee:
MUSASHI SEIMITSU KOGYO KK (JP)
MUSASHI CASTING CO LTD (JP)
MUSASHI CASTING CO LTD (JP)
International Classes:
F16H48/40; B22C9/02; B22C9/24
Foreign References:
| JPH09229163A | 1997-09-02 | |||
| JP2004068873A | 2004-03-04 | |||
| JP2019082204A | 2019-05-30 | |||
| JP2011158045A | 2011-08-18 |
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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