| 摘要 |
An externally toothed gear (4) of a dual-type wave gear device (1) is provided with first and second external teeth (7, 8) having different teeth numbers, and is bent into an elliptical shape by a wave generator. When t(1) represents the tooth-bottom rim thickness of the first external teeth (7), and t(2) represents the tooth-bottom rim thickness of the second external teeth (8), the ratio of t(1)/t(2) is set to a value satisfying 0.5<t(1)/t(2)<1.5. Accordingly, a dual-type wave gear device can be achieved with which the first and second external teeth having different teeth numbers can be suitably bent to form excellent mating states with respective internally toothed gears. |
