| 摘要 |
PROBLEM TO BE SOLVED: To suppress detachment of a spring sheet and a crack of a beam. SOLUTION: In a torsion beam-type rear suspension, expansion parts 4b expanded as compared to other parts are formed at positions on which torsional stress especially tends to converge in an end edge part 4a nearly horizontally bent inside of a torsion beam, i.e., at positions corresponding to an inside flange part and an arm part of a lower spring sheet 12.
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