公开(公告)号：US20150343871A1

公开(公告)日：2015-12-03

申请号：US14789779

申请日：2015-07-01

Applicant: NHK SPRING CO., LTD.

Inventor： Akira TANGE ,  Hideki OKADA

IPC: B60G11/14

CPC classification number: B60G11/14 ,  B60G11/16 ,  B60G2202/12 ,  B60G2206/42 ,  B60G2206/81 ,  B60G2206/8402 ,  B60G2206/8403 ,  B60G2500/20 ,  C21D7/06 ,  C21D9/02 ,  F16F1/04 ,  F16F2226/02

Abstract: 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.

Abstract translation: 在螺旋弹簧的端部匝部之间形成有从电线表面到第一深度的压缩残余应力的压缩残余应力部分。 端部转弯部分的第一部分总是与弹簧座接触。 当施加到螺旋弹簧的负载较大时，第二部分接触弹簧座，并且当负载小时与弹簧座分离。 第三部分总是与弹簧座分开。 在末端匝部，在包括第二部分的区域中，通过超声波喷丸硬化形成深残余应力部分。 深残余应力部分具有从线的表面到比第一深度更深的第二深度的压缩残余应力。