Title:
LINEAR MOTION SHAFT FOR STEERING DEVICE, STEERING DEVICE, AND METHOD OF MANUFACTURING THESE
Document Type and Number:
WIPO Patent Application WO/2020/137552
Kind Code:
A1
Abstract:
This linear motion shaft, in which a first shaft and a second shaft are coupled by friction welding, has improved coaxiality between a section having a first input part and a section having a second input part. A screw shaft 29, which is the first shaft, is provided with a gripping part 56 for centering. While the gripping part 56 of the screw shaft 29 is gripped by a first gripping tool 57 for centering, and a rack shaft 28, which is the second shaft, is gripped by a second gripping tool 58 for centering, the first gripping tool 57 and/or the second gripping tool 58 is rotationally driven. This action causes an axial direction end of the rack shaft 28 and an axial direction end of the screw shaft 29 to abut each other while the screw shaft 29 and the rack shaft 28 are rotated relative to each other, and as a result the rack shaft 28 and the screw shaft 29 are coupled by friction welding.
Inventors:
UNNO KENTARO (JP)
Application Number:
PCT/JP2019/048492
Publication Date:
July 02, 2020
Filing Date:
December 11, 2019
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B21H3/04; B23K20/12; B62D3/12; F16H19/04; F16H25/22; F16H25/24; B21K1/76
Foreign References:
| JP2016179475A | 2016-10-13 | |||
| JP2003033841A | 2003-02-04 | |||
| JPH10547A | 1998-01-06 | |||
| JP2018167780A | 2018-11-01 | |||
| JP2005247163A | 2005-09-15 |
Other References:
See also references of EP 3903962A4
Attorney, Agent or Firm:
KIWA INTERNATIONAL (JP)
Download PDF: