| Summary: | For sine movable tooth drive, the movable tooth number must be increased to obtain large speed ratio of the drive which increases largely radial size of the drive. Here, a two-step sine movable tooth drive is proposed. For the drive, a small radial size and large speed ratio can be realized simultaneously. For the drive, three-dimensional design is done; the forces and the torque in the drive system are investigated; and changes in the output torque along with the main parameters are analyzed. Results show that the output torque of the two-step sine movable tooth drive is much larger than that of the single-step sine movable tooth drive. In the drive, the output torque fluctuation occurs. To reduce the output torque fluctuation, a large speed ratio, large axial amplitude of the sine ball tracks, and a reasonable speed ratio distribution should be used.
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