Ring gear with roll formed teeth

Details Ring gear with roll formed teeth Ring gear with roll formed teeth

1989-03-09

1990-08-07

Larson, Lowell A.

Machine element or mechanism

Gearing

Teeth

298933, 72 68, B21H 500

Patent

active

049457837

ABSTRACT:
A cold-formed ring gear is made from a relatively thin circular metal body, the outer peripheral edge of which is preformed to define a radially inwardly opening U-shaped channel in the outer surface of which the gear tooth pattern is subsequentially cold rolled using a known method and tooling. The unique preformed plate body obviates the need for a grooved interior supporting mandrel and results in a toothed rim of substantially enhanced strength and rigidity. The gear tooth pattern which is cold rolled in the preform provides tooth faces of substantially enhanced width and depth relative to the width and thickness of the base material from which they are formed. All of the other known advantages of cold formed teeth, as opposed to conventional cut teeth, are also realized.

REFERENCES:
patent: 3745851 (1973-07-01), Zeldman et al.
patent: 3796085 (1974-03-01), Fisher et al.
patent: 4116032 (1978-09-01), Krapfenbauer et al.
patent: 4132098 (1979-01-01), Culver et al.

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