| 摘要 |
PURPOSE:To prevent seizure by providing a lubricating oil-sucking hole to be drilled in a main bearing and a subbearing while a rotary shaft to be hollow formed and a spiral groove in the rotary shaft in its subbearing side. CONSTITUTION:A subbearing 2 provides a lubricating oil-sucking hole 10 to be drilled, and hollow forming a rotary shaft 4, delivered gas to a delivery chamber 3 is guided to space 6 in an end part of an electric drive element 5 through this hollow part 4a. A spiral groove 11 is provided in the rotary shaft 4 in its side of the subbearing 2. Thus generating pumping action by the spiral groove 11, lubricating oil is sucked from the lubricating oil-sucking hole 10 of low pressure and can be discharged into the delivery chamber 3 of high pressure in an end part of the subbearing 2. Accordingly, the lubricating oil is prevented from generating its insufficiency between the subbearing 2 and the rotary shaft 4, and seizure can be prevented. |
