| 摘要 |
PURPOSE:To supply oil in optimum amount to bearings even though the revolving speed of the spindle has increased, by furnishing a valve opening and closing with a certain specified pressure at a bypass hole, which diverges from the oil supply hole and opens to the outside of the spindle. CONSTITUTION:Near the bottom of an oil supply hole 25 a bypass hole 27 is furnished, which diverges from the oil supply hole 25 and opens to the outside of a spindle 7, and further a valve 28 to open and close this bypass hole 27 is furnished. This valve 28 consists of a valve holder 29, a valve body 30 to fit with the valve seat of the bypass hole 27, and a compression coil spring 31. The spring force of this compression coil spring 31 is set so that the valve body 30 opens when the oil 16 intruding into the bypass hole 27 from the abovementioned oil supply hole 25 attains a specified pressure. |
