BALL SCREW AND METHOD FOR MANUFACTURING SAME, AND POWER STEERING DEVICE AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2020/189253

A1

The present invention addresses the problem of providing a ball screw having enhanced durability and a structure whereby a screw shaft and a nut satisfy the required performance, a method for manufacturing the same, and a power steering device and a method for manufacturing the same.　This ball screw is characterized by having: a nut which comprises a steel-made base material and in which female threads are formed in the inner circumferential surface thereof; a screw shaft comprising a steel-made base material, the screw shaft being assembled with the nut, and male threads facing the female threads being formed in the outer circumferential surface thereof; and a plurality of balls arranged between the female threads and the male threads; the surface of the nut in contact with the balls and the surface of the screw shaft in contact with the balls each having a carburized layer, and the carbon concentration in the carburized layer of the nut being higher than the carbon concentration of the carburized layer of the screw shaft.

KOMURO MATAHIRO (JP)
HATOU HISAMITSU (JP)
SHIINO KOTARO (JP)
NUMAKURA KOJI (JP)
TSUJIMI SHINTARO (JP)

PCT/JP2020/008825

September 24, 2020

March 03, 2020

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

C21D9/00; B62D5/04; C21D1/06; C21D1/10; F16H25/22; F16H25/24

JP2007239068A	2007-09-20
JP2018035912A	2018-03-08
JP2017083020A	2017-05-18
JP2000129418A	2000-05-09

POLAIRE I.P.C. (JP)

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