Apparatus and method for strengthening gear teeth

Details Apparatus and method for strengthening gear teeth Apparatus and method for strengthening gear teeth

2006-08-03

2010-11-16

Bryant, David P (Department: 3726)

Metal working

Burnishing

Of gear article

C029S090010, C029S893000, C029S893300, C029S893350

Reexamination Certificate

active

07832070

ABSTRACT:
An apparatus and method for increasing the operating life of a rotating gear element including a plurality of outwardly-projecting gear teeth each having an involute profile, with each gear tooth having a pair of flanks and a pair of generally semi-circular root portions. A ring tool having a plurality of hardened, inwardly-projecting burnishing teeth is employed to plastically deform only the root portions of the gear element being formed, while avoiding contact with the flanks as the gear element is passed through the ring tool. The ring tool also includes a plurality of broaching surfaces or cutting edges for removing excess stock material from the surfaces of the root portions. The ring tool increases the compressive residual stresses in the root portion of the gear element being formed, thereby creating an optimal residual stress profile and greater bending strength within the root portion of the gear element.

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