Spindle motor with hydrodynamic bearing structure having capillary seal and disk drive apparatus including same
a technology of hydrodynamic bearings and spindles, which is applied in the direction of sliding contact bearings, instruments, record information storage, etc., can solve the problems of affecting the operation of the spindle motor. , to achieve the effect of reducing the likelihood of lubricating oil leaking through any capillary seal portion
Inactive Publication Date: 2014-07-31
NIDEC CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0010]According to the above-described preferred embodiment of the present invention, a reduction in the likelihood that the lubricating oil will leak through any capillary seal portion is achieved.
Problems solved by technology
However, measuring the level of one of the upper and lower surfaces of the lubricating oil may be difficult because of the structure of the bearing apparatus.
That is, it is impossible to measure the level of the lower surface of the lubricating oil.
This leads to a possibility that a leakage of the lubricating oil out of the spindle motor will be caused by a fluctuation in the level of any surface of the lubricating oil when the spindle motor is running or by an external shocking force when the spindle motor is in a stationary state.
Method used
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Embodiment Construction
[0018]Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It is assumed herein that a direction parallel or substantially parallel to a central axis of a spindle motor is referred to by the term “axial direction”, “axial”, or “axially”, that directions perpendicular or substantially perpendicular to the central axis of the spindle motor are each referred to by the term “radial direction”, “radial”, or “radially”, and that a direction along a circular arc centered on the central axis of the spindle motor is referred to by the term “circumferential direction”, “circumferential”, or “circumferentially”. It is also assumed herein that a vertical direction is the axial direction, and that a side on which a stator unit is arranged with respect to a base portion is defined as an upper side. The shape of each member or portion and relative positions of different members or portions will be described based on the above as...
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Abstract
A lubricating oil is arranged between stationary and rotating portions of a spindle motor. When the motor is stationary, upper and lower surfaces of the lubricating oil are respectively located in upper and lower capillary seal portions. A first angle defined between an outer circumferential surface of the plate portion and an inner circumferential surface of a cylindrical portion at the upper capillary seal portion, and a second angle defined between an outer circumferential surface of a sleeve and an inner circumferential surface of the wall portion at the lower capillary seal portion, in a section taken along a plane including a central axis is respectively in the range of about 1 degree to about 8 degrees and in the range of about 1 degree to about 10 degrees, respectively. The upper capillary seal portion has maximum radial and axial dimensions smaller than those of the lower capillary seal portion.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a spindle motor and a disk drive apparatus.[0003]2. Description of the Related Art[0004]Spindle motors arranged to rotate disks about central axes thereof are typically installed in hard disk apparatuses and optical disk apparatuses. Such spindle motors include a stationary portion fixed to a housing of the apparatus and a rotating portion arranged to rotate while supporting the disk(s). The spindle motor is arranged to produce a torque centered on the central axis by magnetic flux generated between the stationary and rotating portions, whereby the rotating portion is caused to rotate with respect to the stationary portion.[0005]The stationary and rotating portions of the spindle motor are joined to each other through a bearing apparatus. In recent years, in particular, spindle motors have often been provided with a bearing apparatus in which a lubricating oil is arranged between the sta...
Claims
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Patent Timeline
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IPC IPC(8): H02K7/08G11B19/20
CPCG11B19/2009H02K7/086G11B19/2036H02K5/1677F16C33/745F16C17/107F16C2370/12
Inventor SATOSHIRAISHI, MASAHIRO
Owner NIDEC CORP