Disk drive device
AssigneeAlphana Technology Co., Ltd.
InventorMitsuo KODAMA
Life of this patent
Estimating the term…
Abstract
In a disk drive device according to an embodiment, radial dynamic pressure corresponding portions are structured such that the diameters thereof expand toward the axial outside of the sleeve, and that the shaft is in surface-contact with each of the radial dynamic pressure corresponding portions when the rotational drive of the disk drive device is stopped. Further, a herringborn-shaped radial dynamic pressure groove is formed in each of the radial dynamic pressure corresponding portions. The radial dynamic pressure groove in each radial dynamic pressure corresponding portion is formed such that the axial outside length from the turned-back portion of the herringborn-shape is longer than the axial inside length therefrom.
Claims20
A disk drive device comprising:
- a base member;
- and
- a bearing unit that is arranged on the base member and is configured to rotatably support a recording disk relative to the base member, wherein the bearing unit includes:
- a shaft to be the center of the rotation of the recording disk;
- a sleeve configured to house the shaft and to allow relative rotation with the shaft being the axis;
- a radial space portion formed between the inner wall surface of the sleeve and the outer wall surface of the shaft;
- a pair of radial dynamic pressure generating portions respectively configured to generate, in the radial space portion, radial dynamic pressures between the inner wall surface near to one end of the sleeve and the outer wall surface of the shaft, and between the inner wall surface near to the other end of the sleeve and the outer wall surface of the shaft, the one end and the other end of the sleeve being defined in the axial direction;
- and
- lubricant injected into the radial space portion, and wherein a sleeve dynamic pressure corresponding portion that is part of the inner wall surface of the sleeve corresponding to at least one of the pair of the radial dynamic pressure generating portions, is provided such that the diameter of the sleeve dynamic pressure corresponding portion expands toward the axial outside of the sleeve.
A disk drive device comprising:
- a base member;
- and
- a bearing unit that is arranged on the base member and is configured to rotatably support a recording disk relative to the base member, wherein the bearing unit includes:
- a shaft to be the center of the rotation of the recording disk;
- a sleeve configured to house the shaft and to allow relative rotation with the shaft being the axis;
- a radial space portion formed between the inner wall surface of the sleeve and the outer wall surface of the shaft;
- a pair of radial dynamic pressure generating portions respectively configured to generate, in the radial space portion, radial dynamic pressures between the inner wall surface near to one end of the sleeve and the outer wall surface of the shaft, and between the inner wall surface near to the other end thereof and the outer wall surface of the shaft, the one end and the other end of the sleeve being defined in the axial direction;
- and
- lubricant injected into the radial space portion, and wherein a shaft dynamic pressure corresponding portion, which is part of the outer wall surface of the shaft corresponding to at least one of the pair of the radial dynamic pressure generating portions, is provided such that the diameter of the shaft dynamic pressure corresponding portion is reduced toward the axial outside of the sleeve.
Dependencies are inferred from the claim text.