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.


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    Titel :

    Ball screw, method for manufacturing ball screw, power steering device, and method for manufacturing power steering device


    Beteiligte:
    KOMURO MATAHIRO (Autor:in) / HATOU HISAMITSU (Autor:in) / SHIINO KOTARO (Autor:in) / NUMAKURA KOJI (Autor:in) / TSUJIMI SHINTARO (Autor:in)

    Erscheinungsdatum :

    13.08.2024


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / B62D MOTOR VEHICLES , Motorfahrzeuge / F16H Getriebe , GEARING



    BALL SCREW DEVICE, MANUFACTURING METHOD OF BALL SCREW DEVICE AND STEERING DEVICE

    YAMAZAKI EISHI / TSUKAGOSHI MASAYUKI | Europäisches Patentamt | 2018

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