Patent ID: 8186059

Claim:
A method of manufacturing an internal gear and cap assembly, said method comprising: providing an internal gear having a base extending about an axis between a first end and a second end; forming a groove extending to a floor about the axis of the gear; forming a lip extending from the first end about the axis of the gear such that the lip radially surrounds the groove; providing a cap having central portion and a flange extending about the periphery of the central portion; inserting the flange of the cap into the groove of the gear; deforming the lip toward the groove to trap the flange of the cap between the lip and the floor of the groove and retain the cap to the gear such that the lip extends toward the axis of the gear; forming at least one slot in the flange of the cap; and deforming the lip into the at least one slot to form a key-lock between the flange and the lip to prevent the cap from rotating relative to the gear, about the axis.