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US 2006/0039635 A1Published application
Hydrodynamic bearing arrangement for an electric motor
AssigneeMinebea Co., Ltd.
InventorGuido Schmid
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AssigneeMinebea Co., Ltd.
InventorGuido Schmid
Estimating the term…
The invention relates to a hydrodynamic bearing arrangement for an electric motor, particularly for a spindle motor to drive the platters of a hard disk drive. The bearing arrangement comprises a shaft, a bearing bush and a thrust plate disposed fixedly on the shaft, the shaft and the thrust plate rotating with respect to the bearing bush, grooved patterns to generate fluid-dynamic pressure being provided on the thrust plate and/or the surfaces located opposite the thrust plate of the bearing sleeve and/or the cover plate. The grooved pattern comprises a number g of grooves distributed over the surface of the bearing sleeve, the thrust plate or the cover plate, wherein in the shaft and/or in the thrust plate, a number h of holes and/or recesses are provided at the inner edge of the thrust plate and/or at the outer edge of the shaft. According to the invention, the number g of grooves cannot be integrally divided by the number h of holes and likewise that h cannot be integrally divided by g.
A hydrodynamic bearing arrangement for an electric motor, particularly for a spindle motor to drive the platters of a hard disk drive, the bearing arrangement comprising a shaft (1), a bearing bush (2) and a thrust plate (4) disposed fixedly on the shaft, the shaft and the thrust plate rotating with respect to the bearing bush, and grooved patterns (8;
A hydrodynamic bearing arrangement for an electric motor, particularly for a spindle motor to drive the platters of a hard disk drive, the bearing arrangement comprising a shaft (101) and a bearing bush (102), the shaft rotating with respect to the bearing bush and at least one cylindrical zone with a grooved pattern (103) to generate fluid-dynamic pressure being provided on the inner circumference of the bearing bush (102) and/or the outer circumference of the shaft (101), and each grooved pattern (103, 104) comprising a number g′ of grooves distributed over the inner circumference of the bearing bush (102) and/or the outer circumference of the shaft (101), and in the shaft a number h′ of holes (111;
A hydrodynamic bearing arrangement for an electric motor, particularly for a spindle motor to drive the platters of a hard disk drive, the bearing arrangement comprising a shaft (201) and a bearing bush (202, 203), the shaft rotating with respect to the bearing bush and at least one cylindrical zone with grooved patterns (204, 205) to generate fluid-dynamic pressure being provided on the inner circumference of the bearing bush (202) and/or the outer circumference of the shaft (201), and each grooved pattern (204, 205) comprising a number g′ of grooves distributed over the inner circumference of the bearing bush (202) and/or the outer circumference of the shaft (201), and in the bearing bush a number h′ of holes (212, 213, 214;
Dependencies are inferred from the claim text.