Method of manufacturing a hollow steering shaft and hollow steer

Details Method of manufacturing a hollow steering shaft and hollow steer Method of manufacturing a hollow steering shaft and hollow steer

1994-08-10

1996-04-30

Herrmann, Allan D

Machine element or mechanism

Control lever and linkage systems

Hand operated

72282, 72352, B62D 116, B21C 122

Patent

active

055114407

ABSTRACT:
A hollow steering shaft having a good quality can be manufactured at a low cost by passing a blank tube having a circular cross section through a preliminary shaping die and then through a finishing shaping die. The blank tube which has passed through the preliminary shaping die is formed with two kinds of convex curve surface portions having different radii of curvature and arranged continuously, circumferentially and alternately. When the blank tube passes through the finishing shaping die, the larger convex curve surface portions are deformed into flat portions. As a result, a steering shaft having an elliptical cross section is manufactured.

REFERENCES:
patent: 5216912 (1993-06-01), Tanaka
Patent Abstracts of Japan, vol. 11, No. 57, (M-564), (2504) 21 Feb. 1987 (JP-A-61 219 416).

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