| 摘要 |
This gear transmission device comprises a crank shaft, an eccentric rotation gear, and a self-rotating gear. The eccentric rotation gear rotates eccentrically in association with the rotation of the crank shaft. The self-rotating gear meshes with the eccentric rotation gear. The crank shaft includes a shaft part, a first eccentric part, and a second eccentric part. The first eccentric part engages with the eccentric rotation gear. The second eccentric part is provided between the shaft part and the first eccentric part. The rotation axis of the first eccentric part is offset from the rotation axis of the shaft part by a first distance. The rotation axis of the second eccentric part is offset from the rotation axis of the shaft part by a second distance. The second distance is smaller than the first distance. |
