公开(公告)号：US20170286591A1

公开(公告)日：2017-10-05

申请号：US15086009

申请日：2016-03-30

Applicant: NHK SPRING CO., LTD.

Inventor： Yoshio KOBAYASHI ,  Shinichi NISHIZAWA ,  Nobuhisa YASUDA

IPC: G06F17/50 ,  E05F1/12

CPC classification number: G06F17/5086 ,  E05F1/1238 ,  E05Y2201/624 ,  E05Y2900/548 ,  G06F17/5018

Abstract: In a design method of torsion bars used for a trunk lid, free shapes of the torsion bars unhitched from the trunk lid are designed. A center line model of the initial free shape is geometrically and statically created on the basis of a design specification. The center line model of an open shape is created from the free shape model and is deformed into a center line model of a closed modified shape. The center line models of the analyzed closed shape and the target closed shape is compared with each other to obtain a difference torque and a difference vector occurring between corresponding nodes on the center lines. The center line model is so changed as to decrease the difference torque and the difference vector.