| 摘要 |
A roll bar ( 1 ') for a motor vehicle is proposed according to the present invention, with an unsplit torsion bar ( 5 '), which is rotatably fastened to a vehicle chassis ( 3 ), is connected to two opposite wheel suspensions ( 4 ') of the said axle of the vehicle, and has a torsion area for the elastic coupling of spring action movements of the opposite wheel suspensions ( 4 '), wherein the roll bar ( 1 ') has, furthermore, a first torsion tube ( 8 '), which surrounds the unsplit torsion bar ( 5 ') at least in a first partial area (B') of its torsion area, and whose first end ( 8 a') is connected to the unsplit torsion bar ( 5 '), rotating in unison therewith, and whose second end ( 8 b') can be connected to the unsplit torsion bar ( 5 ') by means of a clutch arrangement ( 9 ') in such a way that it selectively rotates in unison therewith, so that the torsional stiffness of the roll bar ( 1 ') can be varied.
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