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US 8,407,899 B2Granted
Fluid dynamic bearing, method of manufacturing fluid dynamic bearing, rotating device, and disk drive device
AssigneeAlphana Technology Co., Ltd.
InventorAkira Muramatsu
Life of this patent
Estimating the term…
Abstract
A fluid dynamic bearing includes a shaft to which a resin flange is fixed by insert molding. The process where the flange is fixed to the shaft by insert molding includes a flange forming process in which the flange, fixed to the shaft, is formed by injecting the resin into a filled portion in the lower mold through an upper mold, while cooling at least part of the shaft, arranged in a shaft arrangement portion in a lower mold, with cooling water circulating through a cooling pipe.
Claims11
A method of manufacturing a fluid dynamic bearing comprising:
- a shaft;
- a flange fixed to one end of the shaft;
- a shaft housing member configured to rotatably house at least part of the shaft;
- a flange housing space provided at one end of the shaft housing member and configured to rotatably house the flange;
- a counter plate configured to face the end surface of the flange in the axial direction and to seal the flange housing space;
- a radial dynamic pressure groove formed on at least either the shaft or the surface of the shaft housing member, facing the shaft in the radial direction;
- thrust dynamic pressure grooves provided on at least either the flange or the surface of the flange housing space, facing the flange in the thrust direction, and provided on at least either the flange or the surface of the counter plate, facing the flange in the thrust direction;
- and
- a lubricant filled in the radial dynamic pressure groove and the thrust dynamic pressure grooves, the method of manufacturing a fluid dynamic bearing comprising:
- forming the flange by fixing a resin to the shaft by insert molding while at least part of the shaft is being cooled.
7 more elements
A method of manufacturing a fluid dynamic bearing comprising:
- a shaft;
- a flange fixed to one end of the shaft;
- a shaft housing member configured to rotatably house at least part of the shaft;
- a flange housing space provided at one end of the shaft housing member and configured to rotatably house the flange;
- a counter plate configured to face the end surface of the flange in the axial direction and to seal the flange housing space;
- a radial dynamic pressure groove formed on at least either the shaft or the surface of the shaft housing member, facing the shaft in the radial direction;
- thrust dynamic pressure grooves provided on at least either the flange or the surface of the flange housing space, facing the flange in the thrust direction, and provided on at least either the flange or the surface of the counter plate, facing the flange in the thrust direction;
- and
- a lubricant filled in the radial dynamic pressure groove and the thrust dynamic pressure grooves, the method of manufacturing a fluid dynamic bearing comprising:
- forming the flange by fixing a resin to the shaft by insert molding;
- and
- adjusting the fixed position of the flange by pressing the flange in an adjusting mold after the flange has been fixed wherein, in the adjusting the fixed position of the flange, the adjusting mold is heated to a temperature slightly lower than the glass transition temperature of the resin of which the flange is made.
9 more elements
Dependencies are inferred from the claim text.