SUSPENSION SPRING DEVICE AND SUSPENSION COIL SPRING

Title:

SUSPENSION SPRING DEVICE AND SUSPENSION COIL SPRING

Document Type and Number:

WIPO Patent Application WO/2015/181916

Kind Code:

A1

Abstract:

Between the end windings (12a, 12b) of a coil spring (12), a compressive residual stress area (50) having compressive residual stress is formed from the surface of the wire (40) to a first depth (D1). The end winding (12a) includes a first portion (12a1), a second portion (12a2) and a third portion (12a3). The first portion (12a1) is always in contact with a spring base regardless of the load applied to the coil spring (12). The second portion (12a2) is in contact with the spring base when the load applied to the coil spring (12) is large, and is separated from the spring base when the load is small. The third portion (12a3) is always separated from the spring base regardless of the magnitude of the load. In a region of the end winding (12a) that includes the second portion (12a2), a deep residual stress portion (51) is formed by ultrasonic shot peening. The deep residual stress portion (51) has compressive residual stress from the surface of the wire (40) to a second depth (D2) greater than the first depth (D1).

Inventors:

TANGE AKIRA (JP)
OKADA HIDEKI (JP)

Application Number:

PCT/JP2014/064165

Publication Date:

December 03, 2015

Filing Date:

May 28, 2014

Export Citation:

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Assignee:

NHK SPRING CO LTD (JP)

International Classes:

F16F1/12; F16F1/00; F16F15/06; F16F15/067

Domestic Patent References:

WO2014077327A1

2014-05-22

Foreign References:

JP2004050906A	2004-02-19
JP2002257169A	2002-09-11
JP2012057777A	2012-03-22
JPS59219534A	1984-12-10
JPH10146634A	1998-06-02
JPS6376730A	1988-04-07
JPH04304A	1992-01-06
EP1201773A1	2002-05-02

Other References: