| 摘要 |
<p>A gear transmission is provided with an internal gear, an external gear, and a crankshaft. The external gear rotates eccentrically relative to the internal gear while meshing with the internal gear. The crankshaft has an eccentric member which engages with a through hole formed in the external gear. The crankshaft causes the external gear to rotate eccentrically. A ball bearing is disposed between an inner periphery of the through hole and an outer periphery of the eccentric member. A first recess corresponding to an outer race of the ball bearing is formed on the inner periphery of the through hole, and a second recess corresponding to an inner race of the ball bearing is formed on the outer periphery of the eccentric member.</p> |
