CPC F16H 49/001 (2013.01) | 16 Claims |
1. A bending meshing gear device comprising:
a wave generator;
an external gear that is bent and deformed by the wave generator;
an internal gear that meshes with the external gear; and
a wave generator bearing disposed between the wave generator and the external gear, wherein
an inner ring rolling surface on which a rolling element of the wave generator bearing rolls includes a hardened layer,
the hardened layer has a characteristic that a surface hardness after operating for a predetermined time is increased compared to a surface hardness before operation or has a characteristic that a surface hardness of a rolling portion of the inner ring rolling surface with which the rolling element is in contact is increased compared to a surface hardness of a non-rolling portion of the inner ring rolling surface with which the rolling element is not in contact after operating for a predetermined time,
the internal gear includes a first internal gear and a second internal gear,
a contact surface pressure of the inner ring rolling surface with the rolling element is higher in a first portion located inside the first internal gear in a radial direction than in a second portion located inside the second internal gear in the radial direction, and
a surface hardness after operating for the predetermined time is higher in the first portion than in the second portion.
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