公开(公告)号：US20170313149A1

公开(公告)日：2017-11-02

申请号：US15528047

申请日：2015-11-10

Applicant: NHK SPRING CO., LTD.

Inventor： Hidenori CHIHARA ,  Hiroto TSUJI ,  Shinichiro KUWATSUKA

IPC: B60G11/04 ,  C21D9/02 ,  F16F1/26 ,  B21D19/12 ,  B21D53/88 ,  F16F3/02

Abstract: A leaf spring device includes a main leaf made of a steel plate including an elastic section configured to generate elastic force when bent; and an eye section formed in an end portion of the elastic section, the elastic section and the eye section being tempered. There is also provided a method for manufacturing the leaf spring device. The eye section is formed by rolling the end of the elastic section into a circular form. The eye section is tempered at a higher temperature than the elastic section.