Patent ID: 8827288

Claim:
A stabilizer for vehicles comprising a hollow member, comprising: a torsion portion extending in a vehicle width direction and having a first cross-sectional area; shoulder portions located at both ends of the torsion portion, the shoulder portions having a different outer diameter than an outer diameter of the torsion portion and having a second cross-sectional area larger than the first cross-sectional area; arm portions respectively extending from the shoulder portions in a front and back direction of a vehicle, the arm portions having the first cross-sectional area; and cross-sectional change portions respectively provided between the torsion portion and the shoulder portions and between the arm portions and the shoulder portions; wherein each cross-sectional change portion is located at a position where a maximum principal stress is produced that is 65 to 70% of a maximum principal stress produced in the shoulder portion; wherein each cross-sectional change portion has a circular cross-sectional profile; and wherein a cross-sectional area of each cross-sectional change portion increases from the first cross-sectional area to the second cross-sectional area.