| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage structure to smoothy drain water penetrating to the internal part of a front case and prevent the occurrence of easy penetration of water through a discharging part. SOLUTION: Drainage structure to discharge water penetrating through the opening part of a front case 7 comprises a groove 7c, a communication port 54, and a drain hole 55. The groove 7c is formed in the lower inner peripheral surface of the fit-in part of the front case 7 in a center case 8 from the front side of a hold plate (a plate part 51a) through the lower side of a hold plate (an annular part 51b). The communiation port 54 is formed in a manner to intercommunicate a space S to hold a rotation regulation member between the hold plate and the center case 8 and the groove 7c. The drain hole 55 is communicated in a position, situated in the rear of the communication port 54, from the groove 7c to the external part of the front case 7. |
