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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/187212
Kind Code:
[Problem] To provide a differential gear device in which the inner circumference of a ring gear is welded to the outer circumference of a differential case, and which can more completely prevent deformation caused by contraction due to cooling following the melting of a welded portion. [Solution] According to the present invention: the inner circumference of the ring gear constitutes an insertion hole into which the differential case is inserted; the insertion hole has a tapered surface that decreases in diameter in the insertion direction of the differential case, and an inner circumferential surface continuously extending further in the insertion direction from the tapered surface; the differential case has an inserted part inserted into the insertion hole; the inserted part has a first outer circumferential surface fitted and inserted into the tapered surface, and a second outer circumferential surface inserted into the inner circumferential surface; a groove part having a notch shape when viewed in a cross section is formed on the side of the boundary between the first outer circumferential surface and the second outer circumferential surface; and welding is set to a depth reaching the groove part.

ITO Kouhei (1, Shiroyama, Ojima-cho, Nishio-sh, Aichi 06, 〒4450006, JP)
OSAWA Hideya (1, Shiroyama, Ojima-cho, Nishio-sh, Aichi 06, 〒4450006, JP)
Application Number:
Publication Date:
October 03, 2019
Filing Date:
September 12, 2018
Export Citation:
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AISIN AI CO., LTD. (1 Shiroyama, Ojima-cho Nishio-sh, Aichi 06, 〒4450006, JP)
International Classes:
F16H48/40; F16H48/08; F16H55/17
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
SUDO Yutaka et al. (801 Miyata Bldg, 1-38-2 Yoyogi, Shibuya-k, Tokyo 53, 〒1510053, JP)
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