| 摘要 |
<p>A reduction gear transmission is realized in which the total speed reduction ratio is adjusted to a desired value without making any changes to a rotation direction changing gear mechanism or a speed reduction unit. The rotation direction changing gear mechanism comprises an input shaft and an input gear that rotates together with the input shaft, and an intermediate gear that is orthogonal to the input shaft and meshes therewith. A reduction ratio adjusting gear mechanism comprises a first spur gear that rotates together with the intermediate gear, a second spur gear that meshes with the first spur gear, and a third spur gear that meshes with the second spur gear. The speed reduction unit comprises a crankshaft that rotates together with the third spur gear and causes an eccentric cam to rotate eccentrically, an external gear that revolves orbitally while being engaged with the eccentric cam, and an internal gear that surrounds the external gear while meshing with the external gear, and that has a number of teeth differing from the number of teeth of the external gear. The reduction gear transmission is capable of changing its total speed reduction ratio by changing at least one gear out of the first spur gear, the second spur gear, or the third spur gear into another gear having a differing number of teeth.</p> |
