Dynamic pressure bearing device

Abstract

In the tiny gap (4) between the underside radial bearing part (13) and the top surface thrust bearing part (15) of the shaft (3), thrust plate (6) and bearing sleeve (1) In the wider flow channel (4a) surrounded by the circumferential corner part (1c), chamfering is performed at the inner circumferential corner part (1c) of the bearing sleeve (1), wherein the wider flow channel (4a) is in the radial direction of rotation The width is formed wider than that of the communication hole (16) located below the wider flow passage (4a) in the radial direction of rotation, thereby smoothing the flow of the lubricating fluid (5) from the communication hole The holes (16) flow into the wider flow channel (4a).

Description

technical field [0001] The present invention relates to a hydrodynamic bearing device in which a bearing member and a shaft member are suspended so as to be relatively rotatable by dynamic pressure generated in a lubricating fluid. Background technique [0002] In recent years, various dynamic pressure bearing devices have been proposed for supporting various rotating bodies such as high-speed rotating magnetic disks, polygon mirrors, and optical disks. For example in Figure 13 , a hydrodynamic bearing device is shown mounted on a spindle motor for a hard disk drive. Figure 13 The arrow marks in the middle solid line indicate the direction of action of the pressure in the lubricating fluid within the bearing section. [0003] like Figure 13 As shown, the dynamic pressure bearing device is configured such that the rotating shaft 110 is inserted in the bearing sleeve 100 in a freely rotatable manner. The lubricating fluid 120 , such as oil, is injected into a minute gap be...

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Problems solved by technology

Therefore, the flow of lubricating fluid 120 is disturbed

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