Title:
POWER TRANSMISSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/262626
Kind Code:
A1
Abstract:
In this power transmission device in which a hub part of a ring gear is fixed by a weld to a flange part along the outer periphery of a transmission member, a hub part (Rb) is provided, on a lateral face (sr1) thereof, with an annular groove (Gr) recessed axially inward so that the axial loci of the annular groove (Gr) and a cavity (30) partially coincide. The hub part (Rb) seen in a cross-sectional plane slicing through the annular groove (Gr) is constricted midway in a portion thereof that is sandwiched between the annular groove (Gr) and the cavity (30)/a weld (3w), and such a constricted portion (Rbk) is designed to have a thickness that enables reduction of residual stress generated in the environs of the weld (3w) on the flange part (3f) due to forces that mutually draw together the flange part (3f) and the hub part (Rb) and that accompany thermal shrinkage of the weld (3w). Due to this configuration, residual stress generated in the environs of the weld of the flange part due to thermal shrinkage of the weld can be reduced.
Inventors:
UCHIDA AKIHIRO (JP)
SEKIGUCHI AKUTO (JP)
OKABE TETSUYA (JP)
SEKIGUCHI AKUTO (JP)
OKABE TETSUYA (JP)
Application Number:
PCT/JP2020/025282
Publication Date:
December 30, 2020
Filing Date:
June 26, 2020
Export Citation:
Assignee:
MUSASHI SEIMITSU KOGYO KK (JP)
International Classes:
F16H48/08; F16H48/40; F16H55/17
Domestic Patent References:
| WO2012039014A1 | 2012-03-29 | |||
| WO2017050375A1 | 2017-03-30 |
Foreign References:
| JPS5234185B2 | 1977-09-01 | |||
| JP2016188657A | 2016-11-04 |
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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