| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of lubricating oil and reduction in the service life of a bearing through temperature rise. SOLUTION: A pipe is attached for connecting spaces of two oil supply chambers connected through the oil tank at a lower part of the main motor to make the atmospheric pressure of the oil supply chambers the same and the oil level heights of the oil supply chambers the same. Communication holes for connecting the oil supply chambers may be provided inside a rotational shaft in place of the pipe connecting the two oil supply chambers. By preventing unbalance of the atmospheric pressure and making the oil level heights of the two oil supply chambers the same, reduction in the service life of the bearing caused by insufficient supply of lubricating oil to the bearing and deterioration of the lubricating oil caused by occurrence of the abnormal stirring heat of the lubricating oil can be prevented. COPYRIGHT: (C)2010,JPO&INPIT
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