The flexible bearing is an important component and installed in the harmonic driver which transmits motion by elastic characteristics of flexible parts. The rings of the flexible bearing are forced to deform by the wave generator of harmonic driver in its unique working condition different from normal bearings. A large bending stress is generated in the both rings of the flexible bearing after assembly deformation in addition to the contact stress of normal bearings. And, the meshing state of the internal gear of the driver will also be affected greatly. In the present research, a statically indeterminate model is proposed by combining theory of normal bearings with mechanics of materials to solve the deformation characteristics and internal force state of the flexible bearing under the wave generator. The results show that the error of mathematical model is within 6.7%.
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