| 摘要 |
Backlash can be removed by simply preloading a first reduction gear and a second reduction gear. Consequently, a reduction gear system from which backlash is removed can be provided simply and inexpensively. There is provided a reduction gear system comprising a first reduction gear having a first internal gear, a first external gear which meshes with the first internal gear, a first crank element which engages with the first external gear so as to cause the first external gear to perform an eccentric motion and a first support element for supporting the first crank element rotatably and a second reduction gear having a second internal gear, a second external gear which meshes with the second internal gear, a second crank element which engages with the second external gear so as to cause the second external gear to perform an eccentric motion and a second support element for supporting the second crank element rotatably, wherein the first crank element and the second crank element are connected to each other, wherein the first support element and the second support element or the first internal gear and the second internal gear are fixed to each other, and wherein the first internal gear and the second internal gear are fixed to each other under a state that the first internal gear and the second internal gear are rotated in opposite directions relative to each other. |
