Patent ID: 11879534
Assignee: NIDEC-SHIMPO CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 14:
15. A flexible external gear comprising:
a tubular portion extending in a first direction, the first direction including a component which extends in a central axis direction; and
a diaphragm portion extending in a second direction from one axial end portion of the tubular portion, the second direction including a radial component; wherein
the tubular portion includes:
a flexible first portion on one axial side; and
a second portion on another axial side relative to the first portion;

the second portion includes external teeth protruding radially outward and arrayed in a circumferential direction;
a maximum value of a thickness of the diaphragm portion is equal to or less than twice a length from a radially outer end of the external teeth to a radially inner surface of the second portion;
a minimum value of a thickness of the first portion is equal to or less than half the maximum value of the thickness of the diaphragm portion; and
in the external teeth adjacent in a circumferential direction, a circumferential interval of a circumferential center of each of the external teeth is larger than twice the minimum value of the thickness of the first portion.