Hydrodynamic bearing device and a recording disk drive equipped with it

Abstract

The invention can miniaturize the conical dynamic pressure bearing device, is cheap, and improves its performance well. Its structure is made so that the opening on the outer peripheral side of the opposite conical inclined bearing space (BS) formed in the opposing gap between the two inclined dynamic pressure surfaces of the bushing (13) and the bushing (21) is connected to the A fluid pressurizing device (13e) for pressurizing the lubricating fluid toward the inner side of the tilt bearing space (BS) is pressurized from the outer peripheral side of the tilt bearing space (BS) to the inner side by the fluid pressurizing device ( 13e) Lubricating fluid pressurized so that the lubricating fluid in the tilting bearing space (BS) can generate dynamic pressure well regardless of the opening angle of the tilting dynamic pressure surface, and at the same time make the dynamic pressure from the tilting bearing due to the centrifugal force of rotation The lubricating fluid leaked out of the outer peripheral side opening of the space (BS) is held stably in the tilt bearing space (BS).

Description

[0001] This case is a divisional application of a patent application titled "Dynamic Pressure Bearing Device and Recording Disk Drive Device Equipped with the Device", filed on June 23, 2004, and numbered "200410061902.2". technical field [0002] The present invention relates to a dynamic pressure bearing device configured to rotatably support a substantially conical bushing and bushing formed by utilizing dynamic pressure of a lubricating fluid so that one side floats with respect to the other side and the other side is non-contact, and a recording disk drive device having the same . [0003] The present invention also relates to a dynamic pressure bearing device and a disk drive device having a dynamic pressure bearing member that supports a rotary shaft using a dynamic pressure of lubricating fluid. Background technique [0004] In recent years, development of dynamic pressure bearing devices capable of stably supporting various rotating bodies at high speeds has been pr...

AI Technical Summary

Problems solved by technology

However, on the opposite side, there is a tendency that the pressure balance of the lubricating fluid filled in the tilt bearing space is easily broken due to a slight dimensional error of each member, so that the pressure difference between the two ends of the tilt bearing space becomes large.

Therefore, there is a problem that it is difficult to stably and reliably obtain the relative floating amount between the fixed member and the rotating member, and it is not easy to obtain an appropriate bearing rigidity

When such air bubbles penetrate into the interior of each dynamic pressure bearing part, good dynamic pressure cannot be obtained, and as a result, the bearing characteristics are significantly impaired.

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