Tubular torsion beam for rear suspensions of vehicles and...

Details Tubular torsion beam for rear suspensions of vehicles and... Tubular torsion beam for rear suspensions of vehicles and...

B - Operations, Transporting

60

G

B60G 11/18 (2006.01)

Patent

CA 2693886

The present invention provides a tubular torsion beam for rear suspensions of vehicles, which is produced according to a more durable design capable of improving roll stiffness and roll strength of the tubular torsion beam. The tubular torsion beam is produced by pressure-forming a tubular steel member through hydroforming such that the tubular torsion beam has a cross-section varying along an entire length thereof, with opposite ends having a closed cross-section and mounted to respective trailing arms, a middle portion having a V-shaped open cross-section, and a transitional portion having a varying cross-section and connecting the middle portion to each of the opposite ends. During the process of manufacturing the tubular torsion beam, the opposite ends of the tubular steel member are fed using respective axial punches of a hydroforming machine, so that the opposite ends are thicker than the middle portion.

La présente invention concerne un longeron de torsion tubulaire pour suspensions arrière de véhicules, lequel est fabriqué selon une conception plus solide en mesure d'améliorer la rigidité au roulis et la résistance au roulis du longeron de torsion tubulaire. Le longeron de torsion tubulaire est obtenu par formage à la presse d'un élément en acier tubulaire par hydroformage de telle sorte que le longeron de torsion tubulaire présente une section transversale variant tout au long de sa longueur, avec des extrémités opposées présentant une section transversale fermée et fixées aux bras oscillants respectifs, une partie centrale présentant une section transversale ouverte en forme de V, et une partie de transition présentant une section transversale variable et reliant la partie centrale à chacune des extrémités opposées. Lors du procédé de fabrication du longeron de torsion tubulaire, les extrémités opposées de l'élément en acier tubulaire sont alimentées à l'aide des poinçons axiaux respectifs d'une machine d'hydroformage de sorte que les extrémités opposées sont plus épaisses que la partie centrale.

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