| 摘要 |
PURPOSE:To restrain the amount of oil jetted into an oil tank from an oil return hole in a bearing runner to eliminate oil leakage troubles, by fitting a plug formed therein with a desired diameter hole, in the oil return hole. CONSTITUTION:A plug 11 having a desired diameter hole is disposed in an oil return hole 3 in a bearing runner 2. The bore of the hole 11a of the plug 11 which is previously determined to have a desirable bore diameter in accordance with the peripheral speed of the bearing runner 2, is substantially in a range of 3mm.-6mm. with respect to 10mm. bore diameter of the oil return hole 3. With this arrangement, the amount of lubrication oil 7 jetted into an oil tank 4 is restrained. Accordingly, the amount of oil vapor 9 generated in the oil tank 9 is also restrained. |
