| 摘要 |
PURPOSE:To improve cooling efficiency for an inner ring by communicating an oil groove disposed on the axial end surface of the inner ring with an oil groove of a shaft member to cool the inner ring by lubricating oil flowing through the oil grooves. CONSTITUTION:Both axial end surfaces 15 of an inner ring 12 of a bearing are respectively provided with an oil groove 16 having an inflow port 17 and an outflow port 15 which are opened to the inner peripheral edge and the outer peripheral edge at plural places. When lubricating oil is supplied to an oil groove 31 of a shaft member 30 to be circulated, lubricating oil branching into the oil groove 16 of the end surface 15 of the inner ring through the inflow port 17 is jetted from the outflow port 18 of the end surface 15 of the inner ring into the bearing. Accordingly, the inside diameter side of the inner ring 12 is cooled by lubricating oil flowing through the oil groove 31 of the shaft member 30, and further the end surface side of the inner ring is efficiently cooled by lubricating oil passing through the oil groove 16. |
