| 摘要 |
A suspension arm (10) is formed by respectively welding both side portions (12A) of an upper plate member (12) and both side portions of a lower plate member (14) to each other, the upper plate member (12) and the lower plate member (14) each having a substantially U-shaped cross-sectional configuration. A bush supporting portion (18) is formed in such a manner that an upper cylindrical portion (12B) and a lower cylindrical portion (14B) are respectively formed by burring at rear ends of the upper plate member (12) and the lower plate member (14). Further, clearances (28, 30) are respectively formed between the side portions (12A) of the upper plate member (12) and the upper cylindrical portion (12B), and between the side portions (14A) of the lower plate member (14) and the lower cylindrical portion (14B). Accordingly, there is no possibility that the heat generated upon welding is directly transmitted to the upper cylindrical member (12B) and the lower cylindrical member (14B), so that the accuracy of the bush supporting portion (18) can be improved. <IMAGE> |
