Patent ID: 9441721
Filing Date: 2016-09-13
CPC Classification: F16H,Y10T

Claim Text:
1. A strain wave gearing unit comprising: a rigid internally toothed gear; a flexible externally toothed gear disposed on an inner side of the internally toothed gear; a wave generator for causing the externally toothed gear to flex in a radial direction and partially mesh with the internally toothed gear, the wave generator being fitted to an inner side of the externally toothed gear; a bearing for supporting the internally toothed gear and the externally toothed gear in a relatively rotatable manner; an annular gap formed between the internally toothed gear and an inner race of the bearing; and an annular filter member fitted in the gap, wherein a sliding portion of the bearing and a meshing portion between the internally toothed gear and the externally toothed gear are communicated via the gap, and the filter member is formed from a fibrous material or a porous material having a predetermined porosity capable of trapping foreign substances included in a lubricant flowing through the gap.