Roll-formed differential gear

Planetary gear transmission systems or components – Differential planetary gearing – Spur gear differential

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Details

475252, 74462, F16H 4806, F16H 5506

Patent

active

056559879

ABSTRACT:
A gear for use in automotive differentials and a method for its manufacture in which, initially, the gear teeth are roll-formed in a cylindrical rod workpiece between a pair of toothed dies so that a fissure is created in the top land of each rolled tooth, the roll-forming being continued until (a) the diameter of the top land of each tooth is slightly greater than the desired cylindrical outside diameter of said gear and (b) each fissure is narrowed to form a seam at the top land surface of each tooth. The gears are then further processed in a relatively short machining operation that removes the narrowed seam in the top land of each gear tooth to reduce the depth of the fissure so that the normal force vector of the highest point single tooth loading ("HPSTL") on the gear tooth is directed below the bottom of the fissure. Preferably, this same finishing operation re-opens the fissure and forms the cylindrical journal/top lands of the gear teeth to a finished outside diameter slightly smaller than the inside diameter of the cylindrical differential housing pocket into which the gear will be received and supported.

REFERENCES:
patent: 3362059 (1968-01-01), Ponio et al.
patent: 3531976 (1970-10-01), Fuhrman
patent: 3626733 (1971-12-01), Zook et al.
patent: 3887979 (1975-06-01), Kamiya
patent: 4942781 (1990-07-01), Hori
patent: 5182937 (1993-02-01), Dickson
patent: 5232416 (1993-08-01), Amborn et al.
patent: 5310389 (1994-05-01), Sato
patent: 5507703 (1996-04-01), Madsack et al.

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