| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device, stably, highly accurately and continuously operable over a long period, by incorporating a bearing cage superior in lubricating performance for excellently continuously maintaining a lubricating state of a bearing, into rolling bearings for supporting an impeller shaft. SOLUTION: The pump device has: the impeller shaft S extending in the predetermined direction; a plurality of rolling bearings 2, 4 and 6 rotatably supporting the impeller shaft; and an oil bath 54 storing lubricating oil 52 for lubricating the rolling bearings. In at least one rolling bearing, the cage 26 rotatably incorporated between bearing rings 20 and 22, is formed by using a porous sintered material as its material, and has a predetermined pore on its surface and the inside, and is positioned so that its part can always contact with the lubricating oil. The lubricating oil is made to flow in the pore from the oil bath in response to rotation, and circulates by being made to flow out to the oil bath from the pore, and cools the bearing by promoting heat exchange between the inside of the pore and the lubricating oil in the oil bath. COPYRIGHT: (C)2008,JPO&INPIT
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