| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure capable of efficiently cooling a bearing device lubricated by grease by compressed air, and preventing the grease in a bearing from being removed by the compressed air, in the bearing device.SOLUTION: In a bearing device J, an outer ring spacer 4 and an inner ring spacer 5 are respectively disposed between outer rings 2 and between inner rings 3 of a plurality of rolling bearings 1 arranged in the axial direction, the outer rings 2 and the outer ring spacer 4 are disposed in a housing, and the inner rings 3 and an inner ring spacer 5 are fitted to a main shaft 7. The rolling bearings 1 are lubricated by grease sealed in bearing spaces S1 respectively disposed between the outer rings 2 and the inner rings 3. A supply opening 10 to supply compressed air A for cool, toward an outer peripheral face of the inner ring spacer 5, is formed on an inner peripheral face of the outer ring spacer 4. Barrier walls 33 are disposed on both end portions in the axial direction, of the inner ring spacer 5 in a state of projecting to an outer diameter side to prevent the compressed air A supplied from the supply opening 10, from flowing into the bearing space S1. |
