| 摘要 |
A speed reduction gear of the differential type comprises a stationary internal gear with teeth of circular convex profile and an external gear with teeth of circular concave profile, the meshing between the profiles occurring preferably in a "concave to convex" state and in which the meshing point moves reciprocally on the concave profile of the teeth of the external gear. In this speed reduction gear, noise is decreased in a large amount by supporting the teeth of the internal gear at their ends relieving intermediate portions of them. |
