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SUSPENSION SPRING DEVICE AND SUSPENSION COIL SPRING
专利权人:
NHK Spring Co., Ltd.
发明人:
TANGE, Akira,OKADA, Hideki
申请号:
EP20140893187
公开号:
EP3150880(A4)
申请日:
2014.05.28
申请国别(地区):
欧洲专利局
年份:
2018
代理人:
摘要:
A compressive residual stress portion (50) having a compressive residual stress from a surface of a wire (40) to a first depth (D1) is formed between end turn portions (12a, 12b) of a coil spring (12). The end turn portion (12a) includes a first portion (12a 1 ), a second portion (12a 2 ), and a third portion (12a 3 ). The first portion (12a 1 ) is always in contact with a spring seat irrespective of a load applied to the coil spring (12). The second portion (12a 2 ) contacts the spring seat when the load applied to the coil spring (12) is large, and is separated from the spring seat when the load is small. The third portion (12a 3 ) is always separated from the spring seat irrespective of the magnitude of the load. In the end turn portion (12a), in a region including the second portion (12a 2 ), a deep residual stress portion (51) is formed by ultrasonic shot peening. The deep residual stress portion (51) has a compressive residual stress from a surface of the wire (40) to a second depth (D2) deeper than the
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