| 摘要 |
A reduction gear device utilized in a joint portion of an industrial robot, durability of the reduction gear device being increased in the case where torque applied to the reduction gear device is high and the reduction gear device is utilized at a high operation rate. In a reduction gear device is provided with a first reduction mechanism and a second reduction mechanism, and the second reduction mechanism includes an external gear that revolves eccentrically, an internal gear that causes orbital revolution of the eccentric movement of the external gear, and an output shaft on either the external gear or the internal gear. In this reduction gear device, in the case where the relationship between an inner diameter D of the internal gear and torque T created by the output shaft fulfills a specific condition, when the reduction gear is operated, makes the density of iron powder adulterated within lubrication sealed within the reduction gear device to be equal to or less than 600 ppm after the pace of increase in density had stabilized. Further, in the case where the relationship between the inner diameter D of the internal gear and the torque T created by the output shaft fulfills the specific condition, the number of teeth of the internal gears is less than a predetermined number of times the difference in the number of teeth between the internal gear and the external gear.
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