BEARING DEVICE OF VERTICAL BUILT-IN MOTOR MAIN SHAFT

PROBLEM TO BE SOLVED: To avoid the insulating material deterioration and oil mist of a built-in motor. SOLUTION: A cover member 4 is fixed to the top end of a housing 1, and an upper bearing 5 is fitted to the inner circumference of the cover member 4 and a main shaft 2 is supported by the bearing 5 at in the upper part of a built-in motor 3. A nozzle 6 is provided directly above the upper bearing 5 to supply lubricating oil 0 directly to the upper bearing 5 from the above. An oil sump 7 is attached to the cover member 4, so as to be placed between the built-in motor 3 and the bearing 5 to recover the lubricating oil 0 dripping from the bearing 5 with the recess 7a of the oil sump 7. An oil drainage pipe 8 is inserted into the housing 1, and its inner end is coupled with the hole 7b of the oil sump 7 to drain the lubricating oil 0 out of the housing 1 from the oil sump 7 through the oil drainage pipe 8.