| 摘要 |
PROBLEM TO BE SOLVED: To heighten material strength by providing one or a plurality of reinforcing walls between an avoiding recessed part and other wall parts excluding the avoiding recessed part in a hollow hole of the avoiding recessed part. SOLUTION: A reinforcing wall of I-shape cross section is provided integrally with a member body 1 in such a mode as to be laid from an innermost part 6a positioned at the innermost part of an avoiding recessed part 6, to a lower external wall part 12 across a hollow hole. The hollow hole 4 is partitioned into two hollow holes 4a, 4b by this reinforcing wall 7. This reinforcing wall 7 functions as a reinforcing member for supporting the avoiding recessed part 6 and is laid over the whole area in the axial direction of the hole. The avoiding recessed part 6 is therefore positively reinforced by this reinforcing wall 7 of I-shape cross section. Accordingly, even in the case of tensile-compressive load or bending load being applied to a bush mounting member A to generate stress concentration on the avoiding recessed part 6, the generation of a crack or braking to the avoiding recessed part can be prevented. |
