| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure that can efficiently cool a bearing device and a shaft supported by the bearing device, and excellently supply oil for lubrication to each roll bearing.SOLUTION: A bearing device J has three or more roll bearings 1 arranged side by side in an axial direction and also has outer ring spacers 4 and inner ring spacers 5, the spacers being each interposed between adjacent roll bearings 1. Each outer ring spacer 4 has at its axial end an oil supply port 21 for supplying a mixture 20 of air and oil to the roll bearings 1. A cooling air discharge port 11 for discharging cooling air 10 toward an outer peripheral surface of the inner ring spacer 5 is provided in an inner peripheral surface of each outer ring spacer 4. Cooling air 10 discharged from each cooling air discharge port 11 has its flow rate and pressure so related that cooling air 10 discharged from the cooling air discharge port 11 of the outer ring spacer 4 located on a downstream side in the flowing direction of the mixture 20 of air and oil does not flow backward against the flow of the mixture 20 of air and oil. |
