公开(公告)号：US10229242B2

公开(公告)日：2019-03-12

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

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.