| 摘要 |
A power transmission device includes a gear speed reduction mechanism which includes an input shaft, an input pinion provided on the input shaft, a rotary shaft other than the input shaft, and a gear incorporated to the rotary shaft, and a casing which accommodates the gear speed reduction mechanism. The casing is made of resin and includes a casing body which includes an incorporating opening for incorporating the gear and a cover which closes the incorporating opening. The casing body includes an input side opening with the opening being a size that the input pinion can be inserted but the gear cannot be inserted. In addition, the rotary shaft is supported by a bearing support which is formed in the casing body, and the bearing support of the rotary shaft is not formed on the cover. |
