Hydroformed collapsible drive shaft and steering shaft and...

B - Operations – Transporting – 21 – D

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B21D 15/03 (2006.01) B62D 1/19 (2006.01) F16F 7/12 (2006.01)

Patent

CA 2378733

A collapsible drive shaft (20) and method of making the same. The collapsible drive shaft (20) includes a tubular member having first (24) and second (22) portions that are integrally formed as a one-piece member. The first portion has splines (26) formed on an exterior surface thereof. The second (22), opposite portion has both outer (Do2) and inner diameters (Di2) that are greater than the outer diameter (Do 1) of the first portion. The method includes placing a tubular metal blank into a hydroforming die (70) having a die cavity and expanding the blank by pressurizing the interior of the blank with hydroforming fluid. During the hydroforming process, the first portion of the blank is expanded to form splines while the second portion is expanded to form inner and outer diameters that are greater than the outer diameter of the first portion. Image

L'invention concerne un arbre d'entraînement pliant (20) et son procédé de fabrication. L'arbre d'entraînement (20) comprend un élément tubulaire comportant une première (24) et une seconde (22) parties intégralement formées sous forme d'un élément solidaire. La première partie comporte des cannelures (26) sur sa surface extérieure. La seconde partie (22) opposée comprend des diamètres extérieur (Do2) et intérieur (Di2) supérieurs au diamètre extérieur (Do1) de la première partie. Le procédé consiste également à placer une ébauche métallique tubulaire dans une matrice d'hydroformage (70) comportant une cavité de matrice, et à soumettre l'ébauche à une expansion en pressurisant l'intérieur de celle-ci avec un fluide d'hydroformage. Au cours du processus d'hydroformage, la première partie de l'ébauche est soumise à une expansion de manière à former des cannelures (26), alors que la seconde partie est soumise à une expansion de manière à former les diamètres intérieur et extérieur supérieurs au diamètre extérieur de la première partie.

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