| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure of a bearing device capable of efficiently cooling an inner ring by using compressed air at low costs while reducing noise.SOLUTION: In a cooling structure of a bearing device, an outer ring spacer 4 and an inner ring spacer 5 are respectively disposed between outer rings 3, 3 and inner rings 2, 2 of a plurality of rolling bearings 1, 1 arranged in the axial direction, the outer rings 3 and the outer ring spacer 4 are disposed in a housing 6, and the inner rings 3 and the inner ring spacer 5 are fitted to a main shaft 7. A nozzle 10 for discharging compressed air toward an outer peripheral face of the inner ring spacer 5, is disposed on the outer ring spacer 4 while inclined forward in the rotating direction, and a clearance between an inner peripheral face provided with a discharge port of the nozzle 10 and an outer peripheral face of the inner ring spacer 5 opposed to the discharge port, is 0.7 mm or more, and 1/2 of a diameter of the nozzle 10 or less. |
