Patent ID: 11904466
Assignee: SEIKO EPSON CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 5:
6. A gear device comprising:
an internal gear;
an external gear having flexibility configured to partially mesh with the internal gear and relatively rotate around a rotation axis with respect to the internal gear; and
a wave generator provided on an inner side of the external gear, including a bearing, and configured to move a meshing position of the internal gear and the external gear in a circumferential direction around the rotation axis, wherein
the bearing includes:
an outer ring having a center axis;
an inner ring provided on an inner side in a radial direction of the outer ring, the inner ring being arranged around the center axis;
a holder provided between the outer ring and the inner ring, the holder being configured with:
an annular base, the annular base being arranged around the center axis, the annular base having a first surface and a second surface opposite to each other along an axial direction of the center axis;
a plurality of first walls extending from the first surface of the annular base along the axial direction, each of the plurality of first walls having a first channel in a circumferential direction of the annular base, a base end of each of the plurality of first walls being fixed to only the first surface of the annular base, a top end of each of the plurality of first walls being free of connection with another structure; and
a plurality of second walls extending from the first surface of the annular base along the axial direction, each of the plurality of second walls having a second channel in the circumferential direction of the annular base, the plurality of first walls and the plurality of second walls being alternately arranged along the circumferential direction of the annular base, a base end of each of the plurality of second walls being fixed to only the first surface of the annular base, a top end of each of the plurality of second walls being free of connection with another structure; and

a plurality of rolling bodies provided between the outer ring and the inner ring, two adjacent rolling bodies of the plurality of rolling bodies sandwiching one of the plurality of first walls or one of the plurality of second walls with having no other wall therebetween,

wherein a position of the first channel and a position of the second channel are different from each other along the axial direction, and
at least one of the first channel and the second channel is a through hole.