| 摘要 |
PROBLEM TO BE SOLVED: To prevent rainwater infiltration, and damp casing vibration excitation force by utilizing irregularity which is formed at the mating faces of split cylindrical casings, and inserting an O-ring into a faucet for fixing the split casings with each other. SOLUTION: A tubular casing 7 is formed by a light member such as a resin of non-magnetic material, and is constituted of right and left of cups 7b, 7c which is split into two pieces at a substantially central vertical surface in the axial direction of a rotating machine. By forming a groove part 7f of a ring shape and a protrusion 7g at the split surface which are fitted to each other, the stress generated at the split surface at the time of fixing work by a fitting leg 7d is received by one casing 7b to suppress the opening of the split surface to be minimum. To improve waterproofing, a small-diameter O-ring 9 which is an elastic member is positioned in the faucet part consisting of the annular groove part 7f and the protrusion part 7g with irregularities, which is fitted to each other. It is thus possible to completely seal rainwater infiltration, even under a harsh environmental condition with the strength of the split surface maintained. |
