Title:
DIFFERENTIAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/002419
Kind Code:
A1
Abstract:
The present invention provides a differential device comprising a cast differential case and a differential gear mechanism stored in the differential case, the inner surface of the differential case having gear support surfaces for the differential gear mechanism, wherein in an inner surface (3i) of a differential case (3) recessed grooves (G1-G3) that pass through at least part of both gear support surfaces (9s, 9p) are formed by sand cores (N), and the recessed grooves (G1-G3) are disposed in positions such that even if parting lines (PL1-PL3) form in the inner surface (3i) of the differential case (3) in correspondence with mold matching surfaces (fc) of core mold halves (C1, C2), the parting lines (PL1-PL3) can be accommodated within the recessed grooves (G1-G3). Thus, even if parting lines remain in the inner surface of the differential case after casting, there is no need to remove the parting lines through after-machining and machining costs can be reduced.
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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/JP2020/025978
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:
| JP2019082204A | 2019-05-30 | |||
| JPH10281256A | 1998-10-23 |
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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