| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability by smoothing the stress change along the extending direction at both end parts of a torsion beam. SOLUTION: At both end parts of a torsion beam 6, a section changing point P is set at the inward of an end part of a first reinforcement 7 in the vehicle width direction. The sectional shape on a trailing arm 1 side is substantially V-shaped by increasing the curvature of a top part on one side of the changing point P, while the sectional shape on a center part side in the vehicle width direction is formed substantially U-shaped by squeezing the top part 6a to relatively increase the curvature of the top part 6a.
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