| 发明名称 |
METHOD OF MANUFACTURING TORSION BAR FOR VEHICLE STEERING DEVICE AND TORSION BAR |
| 摘要 |
A method of manufacturing a torsion bar includes a first shaping step of reducing a diameter of a round bar steel material according to cold drawing work so as to have a hardness including an inside through a surface layer of 320 or more to 450 or less by Vickers hardness (HV), and a second shaping step of cutting a midway area of the steel material in the longitudinal direction so as to obtain a spring portion. <IMAGE> |
| 申请公布号 |
EP1484121(A4) |
申请公布日期 |
2005.12.21 |
| 申请号 |
EP20030710334 |
申请日期 |
2003.03.13 |
| 申请人 |
KOYO SEIKO CO., LTD. |
发明人 |
YOSHIMURA, MOTONOBU;OKUMOTO, MASAFUMI |
| 分类号 |
B62D1/16;B21C1/00;B21C37/04;B21K1/06;B21K1/76;F16F1/14;(IPC1-7):B21C1/00 |
主分类号 |
B62D1/16 |
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代理人 |
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