Method of manufacturing a hollow power transmission shaft

摘要

A method of producing a hollow power transmission shaft having a large-diameter portion formed along an axially central portion thereof and small-diameter portions, which have splines formed at ends thereof respectively, formed along axially opposite lateral portion thereof, the small-diameter portions being located laterally with respect to the large-diameter, the method comprising:
Drawing a pipe material to form a hollow shaft material having the large-diameter portion and the small-diameter portions;
preparing a dice having on an inner periphery thereof a spline molding portion, whose maximum diameter is larger than an outer diameter of the ends of the small-diameter portions of the hollow shaft material and whose minimum diameter is smaller than the outer diameter of the ends of the small-diameter portions of the hollow shaft material; and
axially press-fitting the ends of the small-diameter portions of the hollow shaft material into the spline molding portion of the dice to mold the splines at the ends respectively.