LINEAR DRIVE SHAFT FOR ELECTRIC POWER STEERING DEVICE, ELECTRIC POWER STEERING DEVICE, AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2020/137551

A1

In this linear drive shaft in which a rack shaft part and a ball screw shaft part are joined to each other through friction pressure welding, the coaxiality between a portion having the rack shaft part and a portion having the ball screw shaft part is improved. In a state in which a screw shaft part 29 is provided with a centering gripping part 56, the gripping part 56 of the screw shaft part 29 is gripped by a centering first gripping tool 57, and a rack shaft part 28 is gripped by a centering second gripping tool 58, axial end portions of the rack shaft part 28 and the screw shaft part 29 abut each other while the screw shaft part 29 and the rack shaft part 28 are rotated relative to each other through rotational driving of the first gripping tool 57, so that the rack shaft part 28 and the spring shaft part 29 are joined to each other through friction pressure welding.

YASUDA KANAME (JP)
UNNO KENTARO (JP)
MAYUZUMI TAKANORI (JP)
TERAKADO HISASHI (JP)

PCT/JP2019/048491

July 02, 2020

December 11, 2019

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NSK LTD (JP)

B62D3/12; B21H3/04; B21K1/76; B23K20/12; F16H19/04; F16H25/22

JP2005247163A	2005-09-15
KR20110101437A	2011-09-16
JP2016179475A	2016-10-13
JP2017087819A	2017-05-25
JP2017089688A	2017-05-25
JP2014234882A	2014-12-15
JP2013508158A	2013-03-07
JP2017056479A	2017-03-23
JP2017082811A	2017-05-18
JPH1182666A	1999-03-26
JP2007504408A	2007-03-01
JP2012040606A	2012-03-01
JP2005247163A	2005-09-15

See also references of EP 3904183A4

KIWA INTERNATIONAL (JP)

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