Method for producing worm shaft for use in power steering appara

Details Method for producing worm shaft for use in power steering appara Method for producing worm shaft for use in power steering appara

1984-01-16

1987-09-01

Spruill, Robert L.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72358, 72377, B21D 2226, B21D 2228

Patent

active

046899839

ABSTRACT:
A method for producing a worm shaft for use in a rotation control valve of a power steering mechanism. The worm shaft is formed with grooves which receive a control body and form therewith a fail safe structure. The grooves are formed evenly so that the permitted range of movement on either side of a neutral position is uniform. A cylindrical member is plastically deformed in two steps to form the outer side of the control valve. Then, while in a die having in inner shape corresponding to the desired outer shape of the worm shaft, a punch, having an outer shape corresponding to the desired shape of the grooves on the inner surface of the worm shaft and an enlarged-diameter portion, is pressed into a hole in the interior of one end of the member to thereby plastically deform the member to the desired final inner and outer configurations.

REFERENCES:
patent: 2586336 (1951-02-01), Huck
patent: 3921669 (1975-11-01), Goff
patent: 4050283 (1977-09-01), Schober
patent: 4291568 (1981-09-01), Stifano

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