Patent ID: 7465134
Filing Date: 2008-12-16
Classification: B23D,B23F,Y10T

Abstract:
1. A method for forming an internal gear member having a plurality of gear teeth, each of the gear teeth having first and second flank portions circumferentially spaced from one another, comprising: providing a broaching tool having a first set of broaching teeth and a second set of broaching teeth; providing a gear blank defining an internal aperture; passing the broaching tool through the internal aperture of the gear blank; rotating the broaching tool at a first predefined rate as the broaching tool passes through the internal aperture of the gear blank such that the first set of broaching teeth cut only the first flank portion of the plurality of gear teeth; and rotating the broaching tool at a second predefined rate as the broaching tool passes through the internal aperture of the gear blank such that the second set of broaching teeth cut only the second flank portion of the plurality of gear teeth; wherein the broaching tool is rotated sufficiently such that the first and second flank portions of each gear tooth are tapered between a first end portion and a second end portion so that one of said end portions is narrower than the other of said end portions.