| 摘要 |
PROBLEM: The invention aims to manufacture at lower cost a suspension arm including a bushing receiving sleeve welded to the end surface of the tubular joint portion of the suspension arm body to seal the opening in the end surface. SOLUTION: The end surface 20 of the end 14, which serves as a tubular joint portion, is curved to have a circular arc profile complementary to the cylindrical outer surface 18 of the bushing receiving sleeve 16. The end surface 20 in its entire periphery is generally in contact with the cylindrical outer surface 18, and welded along its entire periphery to the cylindrical outer surface 18. This allows the bushing receiving sleeve 16 to adequately seal the opening in the end surface 20, thereby assuredly preventing water and/or mud from intrusion into the suspension arm body 12. Further, a round tube material may be directly used as the bushing receiving sleeve 16. The end surface 20 of the end 14 is only required to have a circular arc profile without any special dimensional accuracy control. In the welding process, the welding torch only need to trace the cylindrical outer surface 18 of the bushing receiving sleeve 16. The manufacturing cost is thus reduced. |
