| 摘要 |
PROBLEM TO BE SOLVED: To suppress the stay of air bubbles in a lubricant which is retained at an external peripheral face of a housing, in a bearing mechanism of a motor.SOLUTION: A bearing mechanism has a first constitution part having a first cylindrical part 61 with a vertically-directed center axis as a center, and a second cylindrical part 282 with the center axis as a center. An internal peripheral face of the second cylindrical part and an external peripheral face of the first cylindrical part oppose each other in the radial direction, a seal part, in which an interface of a lubricant is located, is arranged in a seal gap which is formed between a second constitution part which is rotatable relatively to the first constitution part and the first constitution part. A member including the first constitution part is a resin molded product or a meal die-cast product. A maximum outside diameter part 642 becoming maximum in an outside diameter, an annular step part 643 having a face oriented to the interface side and becoming smaller than the maximum outside diameter part in an outside diameter, and an inclined part 644 whose outside diameter is gradually reduced toward the interface from the annular step part are arranged in a region which contacts with the lubricant at the external peripheral face of the first cylindrical part, and a line for connecting the maximum outside diameter part and the annular step part is formed. |
