| 摘要 |
<p>[Problem] It is an object to provide a speed change gear device which is provided with a construction differing from that in the prior art and which is capable of obtaining a high speed change ratio and improving the strength of the device as a whole. [Solution] A speed change gear device 1 is provided with a housing H, a first member 20 supported rotatably about a predetermined rotational axis Lo, a shaft member 70 formed with an external gear 71, an annular member 30 formed with an internal gear 31 meshing with the external gear 71, a disc member 50 arranged to be rotatable relative to the housing H, and a transmission mechanism for transmitting a rotational component only of the annular member 30 to the disc member 50. The external gear 71 differs from the internal gear 31 in the number of teeth. Further, the first member 20 is formed with a receiving hole 21 that receives the annular member 30 at a position where the center of the annular member 30 is at a predetermined distance from the rotational axis Lo. Then, the annular member 30 is received in the receiving hole 21 rotatably relative to the first member 20.</p> |
