Devices for forming two-tier helical gears

Details Devices for forming two-tier helical gears Devices for forming two-tier helical gears

1991-09-24

1993-11-09

Bushey, Scott

Plastic article or earthenware shaping or treating: apparatus

Means for molding powdered metal

425352, 425414, 425415, 425418, B22F 500

Patent

active

052597440

ABSTRACT:
A device for forming a two-tiered external helical gear, having upper and lower parts having pitch circles of different diameters, includes a die, an upper punch and a lower punch which are rotatable relative to one another, and a core. The die is formed on the inner periphery with helical teeth in two tiers. The upper and lower teeth have the same twisting direction and lead and have pitch circles of diameters corresponding to the diameters of the pitch circles of the upper and lower parts of the gear. The upper punch is formed on the outer periphery with helical teeth adapted to mesh with the first tier of helical teeth on the inner periphery of the die. The lower punch is formed on the outer periphery thereof with helical teeth adapted to mesh with the second tier of helical teeth on the inner periphery of the die. There is also provided a similar device for forming a two-tiered internal helical gear.

REFERENCES:
patent: 3020589 (1962-02-01), Maritano
patent: 3694127 (1972-09-01), Takahashi et al.
patent: 3909167 (1975-09-01), Signora

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