| 摘要 |
PROBLEM TO BE SOLVED: To prevent dry slide between a support shaft and a rotor with a simple structure. SOLUTION: In a water pump 1 including an impeller 3 held in a volute casing 11, a rotor shaft (rotor) 4 rotatably supported by a support shaft 2 and provided with the impeller 3 at one end, and a pump case 10 including the rotor holding part 12 holding the rotor shaft 4, a groove 8 extending in a direction perpendicular to the support shaft 2 is formed on a surface 15a of a wall part (longitudinal bulkhead 15) opposing to another end 4a of the rotor shaft 4 out of wall part dividing the rotor holding part 12. Cooling water can be led to a sliding surface of the support shaft 2 and the rotor shaft 4 and dry slide can be prevented by forming such a groove 8 even if air is mixed in cooling water during operation of an electric water pump 1. COPYRIGHT: (C)2010,JPO&INPIT
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