| 摘要 |
<p>A gear transmission comprises an internal gear, and an external gear that meshes with the internal gear and rotates eccentrically relative thereto. A shaft including an eccentric body is engaged with one of the internal gear and the external gear. A ring adjacent to the eccentric body is attached to the shaft. A groove is formed on an outer circumferential surface of the shaft. The groove passes through an inner side of the ring from a position where the eccentric body is arranged and extends toward both ends in the axial direction of the shaft.</p> |
