Patent ID: 7121559
Filing Date: 2006-10-17
Classification: B60G

Abstract:
1. A roll bar for a motor vehicle having a vehicle chassis and two opposite wheel suspensions of a same axle, the roll bar comprising: an unsplit torsion bar rotatably fastened to the vehicle chassis and connected to the two opposite wheel suspensions of the same axle of the vehicle and having a torsion area for elastically coupling spring action movements of the two opposite wheel suspensions; a clutch arrangement; a first torsion tube surrounding said unsplit torsion bar at least in a first partial area of a torsion area of said unsplit torsion bar, said torsion tube having a first end connected to said unsplit torsion bar and rotating in unison therewith, and having a second end connectable by said clutch arrangement to said unsplit torsion bar, selectively rotating in unison therewith, so that the torsional stiffness of the roll bar can be varied; and a second torsion tube surrounding said torsion bar in a second partial area of the torsion area, said second torsion tube having a first end connected to said second end of said first torsion tube by said clutch arrangement to selectively rotate in unison therewith, and said second torsion tube having a second end connected to said unsplit torsion bar to rotate in unison therewith, wherein said first end of said first torsion tube and/or said second end of said second torsion tube is mounted on said torsion bar rotating in unison such that it can be axially displaced by said clutch arrangement.