| 摘要 |
PURPOSE:To eliminate a trouble due to blocking or the like in piping and a strainer, by immersing a heat receiving part of a heat pipe in an oil pan, which accumulatively stores lubricating oil supplied to a bearing, and providing a heat radiating part of said heat pipe to be arranged outside a room so as to eliminate the necessity for providing a flexed cooling pipe. CONSTITUTION:An oil pan 6, which is mounted to a bearing bed 2, is filled inside with lubricating oil 7, and a bearing 3 and one part of a flange part 5 of a main shaft 4 are immersed in this lubricating oil 7. While a heat pipe 8 provides its heat receiving part 8a appearing in the lubricating oil 7 penetrating through the bearing bed 2 and the heat radiating part 8b extending outside a room penetrating through a wall 1. Heat of the lubricating oil 7, which is transmitted in the heat pipe 8 from the heat receiving part 8a reaching the heat radiating part 8b, is discharged outside the room from the heat radiating part 8b.
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