Rotating device

Abstract

Abstract PURPOSE: To reduce a starting torque and abrasion of a bearing surface by a method wherein the bearing having a small contact area and two sets of thrust bearing having remarkably different clearances and load capacity characteristics are combined in a rotating device being supported by a hydraulic bearing. CONSTITUTION: A double spiral 7 as a shaft direction control means is provided on an upper surface 8 of a flange 3 for a thrust bearing while a ring-shaped protrusion 9 is provided on a lower surface 10 of the flange 3. When a shaft is rotated under such a constitution, an oil film pressure is generated on bearing surfaces 8, 11 and the double spiral 7 sends lubricating fluid 201 by pressure into a direction shown by arrow signs, thereby, a high pressure is generated by a pumping action and a wedge effect thereof even though a sufficient clearance δ 2 is existing. On the other hand, a relative clearance is varied in accordance with a circumferential direction in the step bearing 11 and a positive pressure is generated therein, therefore, a large load capacity can be obtained only when the clearance δ 1 is small. According to this constitution, the shaft may be started by a low torque upon starting time of rotation and an axial positional variation due to an abrasion thereof may be restrained. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Teruo Maruyama

Bibliographic Details