| 摘要 |
PURPOSE:To aim at stably feeding oil to an intermediate metal, by providing a crosswise hole communicating between a vent hole and an annular groove so that air-bubbles accumulated in the annular groove are forcedly removed under the effect of negative pressure created in the vent hole. CONSTITUTION:Oil fed through an eccentric hole 21 is led from a crosswise hole 18 to an upper metal 8 for lubrication. Therefore, the temperature of the oil is raised so that coolant within the oil is evaporated so that air-bubbles are accumulated in an annular groove 10, resulting in shortage of feed oil for an intermediate metal 9, in order to prevent this problem another crosswise hole 20 communicated with a vent hole 20 is formed, horizontally in a position adjacent to the annular groove 10. Thereby, air-bubbles accumulated in the annular groove 10 are removed, thereby oil may be stably fed to the intermediate metal 9. |
