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Patent Searching and Data


Title:
BALL SCREW, METHOD FOR MANUFACTURING THE SAME, POWER STEERING DEVICE, AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2020148299
Kind Code:
A
Abstract:
To provide a ball screw in which a screw shaft and a nut have the structures satisfying required performance and which improves durability, and provide a manufacturing method therefor, a power steering device, and a method for manufacturing the same.SOLUTION: A ball screw of the present invention has a nut made of a steel base material which has a female screw formed on the inner peripheral surface, a screw shaft combined with the nut and made of a steel base material which has a male screw formed on the outer peripheral surface to face the female screw, and a plurality of balls disposed between the female screw and the male screw. The surface of the nut, which comes in contact with the balls, and the surface of the screw shaft, which comes in contact with the balls, have carburized layers, and the carbon concentration in the carburized layer of the nut is higher than the carbon concentration in the carburized layer of the screw shaft.SELECTED DRAWING: Figure 3

Inventors:
KOMURO MATAHIRO
HATO HISAMITSU
SHIINO KOTARO
NUMAKURA KOJI
TSUJIMI SHINTARO
Application Number:
JP2019047918A
Publication Date:
September 17, 2020
Filing Date:
March 15, 2019
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD
International Classes:
F16H25/22; B62D5/04; C21D1/06; C21D1/10; C21D9/00; F16H25/24
Attorney, Agent or Firm:
Polaire Patent Service Corporation