| 摘要 |
A new blank is provided for use in the manufacture of a modified fast fade rear axle housing of rectangular cross-section having a shortened neck shape which is bent by hot forming preferably at temperatures of 1350 DEG F.-1650 DEG F. to maximize the torsional strength of the housing in the expanded annular section where the transition zone joins the center differential receiving portion and the beam arms of the axle. Two U sections are welded after being bent to provide parallel legs joined to a web by arcuate corner sections. The axially extending curvature of the corner sections and the web are respectively convexly defined by a first radius R1 measured from a true origin at the vertical axis of the differential receiving portion where it intersects the longitudinal axis of the axle and a second eccentric radius R2 measured from a displaced origin and concavely by blending radii R4 and R3 which are substantially less than corresponding blending radii in drive axle housings in which the convex curvature is concentric with the true origin. The blending radii and the eccentric radius values result in a shortened taper in the transitional zone which is about half that of a conventional slow fade taper wherein no eccentric radius is used. The new blank both uses and wastes less metal and is uniquely characterized in the internodal contour and transition zone slopes which are distinctly different from blanks utilized in the manufacture of conventional slow fade axle housing.
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