Method for molding pinion

Details Method for molding pinion Method for molding pinion

1995-12-07

1997-06-03

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 63, 425577, 425DIG58, B29C 4544

Patent

active

056351267

ABSTRACT:
A molded pinion includes separate gear portions with gear teeth, and gearless shaft portions provided between the adjacent gear portions. The shaft portions have an outer diameter smaller than the dedendum of the gear teeth of the gear portions. Each shaft portion has an axial length longer than an axial length of each gear portion. Disclosures are also directed to a molding die assembly including first split dies which are movable in radial directions to form the gear portions of the pinion, and second split dies which are movable in radial directions independently of the first split dies to form the shaft portions, and a molding method using the molding die assembly.

REFERENCES:
patent: 3357653 (1967-12-01), Otsuka
patent: 3779688 (1973-12-01), Jullien-Davin
patent: 3840636 (1974-10-01), Deguchi et al.
patent: 3895389 (1975-07-01), Arai
patent: 3973268 (1976-08-01), Arai
patent: 4114169 (1978-09-01), Yamamori
patent: 4134657 (1979-01-01), Nomura
patent: 4847647 (1989-07-01), Ueda
patent: 4954859 (1990-09-01), Kitazawa
patent: 5386740 (1995-02-01), Nomura et al.
Rosato, Dominick V., Injection Molding Handbook, 1986, pp. 197-200.

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