Title:
ボールネジおよびその製造方法ならびにパワーステアリング装置およびその製造方法
Document Type and Number:
Japanese Patent JP7292067
Kind Code:
B2
Abstract:
An object of the present invention is to provide a ball screw having a structure in which a screw shaft and a nut satisfy required performance and having improved durability, a method for manufacturing the ball screw, a power steering device, and a method for manufacturing the power steering device.A ball screw according to the present invention includes: a nut made of a steel substrate having an inner peripheral surface on which a female screw is formed; a screw shaft that is combined with the nut and is made of a steel substrate having an outer peripheral surface on which a male screw facing the female screw is formed; and a plurality of balls arranged between the female screw and the male screw. A surface of the nut in contact with the ball and a surface of the screw shaft in contact with the ball each have carburized layers. A carbon concentration in the carburized layer of the nut is higher than a carbon concentration in the carburized layer of the screw shaft.
Inventors:
Matahiro Komuro
Hisamitsu Hato
Kotaro Shiino
Koji Numakura
Shintaro Tsujimi
Hisamitsu Hato
Kotaro Shiino
Koji Numakura
Shintaro Tsujimi
Application Number:
JP2019047918A
Publication Date:
June 16, 2023
Filing Date:
March 15, 2019
Export Citation:
Assignee:
Hitachi Astemo, Ltd.
International Classes:
F16H25/22; B62D5/04; C21D1/06; C21D1/10; C21D9/00; F16H25/24
Domestic Patent References:
| JP2007239068A | ||||
| JP2018035912A | ||||
| JP2017083020A | ||||
| JP2000129418A |
Attorney, Agent or Firm:
Polaire Patent Attorneys Corporation
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