A compressive residual stress portion having a compressive residual stress from a surface of a wire to a first depth is formed between end turn portions of a coil spring. The first portion of the end turn portion is always in contact with a spring seat. The second portion contacts the spring seat when the load applied to the coil spring is large, and is separated from the spring seat when the load is small. The third portion is always separated from the spring seat. In the end turn portion, in a region including the second portion, a deep residual stress portion is formed by ultrasonic shot peening. The deep residual stress portion has a compressive residual stress from a surface of the wire to a second depth deeper than the first depth.


    Access

    Download


    Export, share and cite



    Title :

    SUSPENSION SPRING APPARATUS AND SUSPENSION COIL SPRING


    Contributors:
    TANGE AKIRA (author) / OKADA HIDEKI (author)

    Publication date :

    2015-12-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge



    SUSPENSION SPRING DEVICE AND SUSPENSION COIL SPRING

    TANGE AKIRA / OKADA HIDEKI | European Patent Office | 2019

    Free access

    SUSPENSION COIL SPRING

    SAYAMA HIRONOBU | European Patent Office | 2018

    Free access

    SUSPENSION COIL SPRING

    SAYAMA HIRONOBU | European Patent Office | 2017

    Free access

    SUSPENSION COIL SPRING

    SAYAMA HIRONOBU | European Patent Office | 2015

    Free access

    SUSPENSION COIL SPRING

    SAYAMA HIRONOBU | European Patent Office | 2020

    Free access