| 摘要 |
PURPOSE:To increase a cooling effect of a bearing, by providing an oil tank to the bearing and arranging a cooling pipe in the oil tank in such a manner as to intersect the direction of a flow of lubricating oil caused from rotary motion of a main shaft. CONSTITUTION:A cooling pipe 4 in an oil tank (not shown in the drawing) is spirally arranged, in a circumferential direction of a main shaft 1 with its concentric circle as the center line, in such a manner as to cross with the direction 3 (broken line arrow head) of a flow of lubricating oil caused by rotation of the main shaft 1. In this way, flows qi, qo of cooling fluid in the cooling pipe 4 are circulated crossing with the flow direction 3 (broken line arrow head) of the lubricating oil, and cooling can be performed at a high heat transfer rate, then a cooling effect can be increased to about 30-50% as compared with that in the past. |
