The present invention relates to a spindle device in which the spindle bearings are lubricated with an oil jet.
Oil jet lubrication has proved superior to oil mist lubrication for very high speed bearings, cooling and lubricating them much better than oil mist which is now generally used for lubricating very high speed precision ball bearings in machine tools or others.
Experimental oil jet lubrication has been successful in laboratories, but the practical use was not yet realized because of problems in expensive oil consumption and environmental oiling.