JP3122824B2 - Sealed structure of spindle motor opening - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for sealing an opening in a spindle motor in which a bearing for rotatably supporting a rotor is accommodated.

[0002]

2. Description of the Related Art Conventionally, there is a motor generally called a spindle motor which is mainly used for rotating a disk (magnetic disk, optical disk) or the like. This spindle motor has an opening in which a bearing for rotatably supporting a rotor is accommodated.

[0003]

However, when such a spindle motor is incorporated in, for example, a disk drive and is mounted on an information processing device that does not like dust, dust generated in a bearing or in a spindle motor may be generated. There is a problem that generated dust flows into the information processing device from the opening hole, and deteriorates the performance of the information processing device.

[0004]

The present invention SUMMARY OF THE INVENTION may, rotor and, in a spindle motor comprising a frame having an opening hole bearing is accommodated rotatably supporting the rotor, a flat plate shape covering the outer side surface of the bearing preparative of a seal, the seal and comprises a plate-shaped space <br/> support for separating comprises being said seal from said external side surface between said outer side surface, the openings on the lower surface of the frame Surround
An annular recess is provided, and the spacer and seal are
Do not project into the annular recess of the frame
The above-mentioned problem has been solved by a sealed structure of an opening hole of a spindle motor, which is fitted .

[0005]

The dust generated in the bearing or the spindle motor is prevented from flowing out by the seal even if it tries to flow out through the opening. Moreover, the seal is separated from the outer side surface of the bearing by the spacer, and does not adhere to the outer side surface of the bearing. Ma
In addition, an annular recess surrounding the opening hole is provided on the lower surface of the frame.
The flat spacers and seals are
Are fitted so that they do not protrude from the annular recess.
For easy positioning when installing spacers and seals
And there is no part protruding from the lower surface of the frame
When installing the spindle motor, it will not interfere with the work.
No.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The spindle motor 10 includes a disk drive 11
And has a frame 13 attached to the base 12 of the disk drive 11. The disk drive device 11 is provided in an information processing device (not shown). Opposing surfaces 121 and 191 between the base 12 and a rotor 19 described later.
Are slanted in order to make the facing surface narrow and wide, and form a labyrinth structure 14.

[0007] A cylindrical support cylinder 15 is formed integrally with the frame 13.
An annular concave portion 130 is provided so as to surround opening hole 151.
ing. An armature 16 is provided in the support cylinder 15, and a pair of bearings 17 and 18 are provided in an opening 151 of the support cylinder 15. The shaft portions 20 of the rotor 19 are press-fitted into the bearings 17 and 18. The rotor 19 has a ring-shaped permanent magnet 21 facing the armature 16. Rotor 1
The disc D is mounted on the head of the disc 9.

[0008] annular recess provided on the lower surface of the frame 1 3
130, the outer side surface 181 of one of the bearings 18 is provided.
, And a sealing structure 30 that seals the opening 151 is formed. The sealing structure 30 includes a flat plate-shaped seal 31 covering the outer side surface 181 of the bearing 18, and a disk-shaped spacer 32 interposed between the seal 31 and the bearing 18 to separate the seal 31 from the outer side surface 181. It is composed of The shape of the spacer may be a ring shape. Seal 31 adhesive is applied to the surface, attached to the spacer 32, the annular recess at the edges 311
It is stuck on the side of 130 . Spacer 32 and seal
31 is fitted into the annular concave portion 130 and the frame 13
It does not protrude from the lower surface. The seal 31
The spacer 32 is formed of a rigid metal such as stainless steel.

Since the seal 31 is separated from the outer side surface 181 of the bearing by the spacer 32, it does not adhere to the outer side surface 181 of the bearing 18. Therefore, the sealing structure 30 does not prevent the seal 31 from adhering to the bearing 18 and hindering the rotation of the bearing 18.

Next, the operation will be described. The rotor 19 of the spindle motor 10 is rotated by the magnetic action of the permanent magnet 21 and the armature 16 to rotate the loaded disk D. The rotating disk D is a magnetic head (not shown).
Approaches and the stored information is read. The rotation of the rotor 19 causes the inside of the rotor 19 or the bearing 1
Dust is generated in 7,18. However, the dust generated by the labyrinth structure 14 and the closed structure 30
It is trapped inside the rotor 19 and the bearings 17 and 18 and does not flow out of the spindle motor 10.

[0011]

According to the present invention, the closed structure of the opening hole of the spindle motor prevents dust generated in the bearing or the spindle motor from flowing into another device (for example, an information processing device) that dislikes dust. Because you can
It is possible to prevent performance degradation of other devices. Further, the seal is separated from the outer side surface of the bearing by the spacer so as not to adhere to the outer side surface of the bearing, so that rotation of the bearing is not hindered . In addition, an annular recess is provided on the lower surface of the frame.
The spacer and seal in the annular recess
Positioning is easy. In addition, the closed structure of the present invention
It is located in the annular recess provided in the frame and
This spin does not project from the bottom
When installing a dollar motor, it may interfere with work
Absent.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a spindle motor having a sealed structure according to the present invention.

[Explanation of symbols]

Reference Signs List 10 spindle motor 13 frame 130 annular concave parts 17, 18 bearing 19 rotor 30 sealing structure 31 seal 32 spacer 151 opening hole 181 outer side surface of bearing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/173 H02K 5/15 H02K 21/22

Claims (1)

(57) [Claims] 1. A spindle motor comprising a rotor and a frame having an opening hole in which a bearing for rotatably supporting the rotor is housed, wherein a flat seal covering an outer side surface of the bearing;
A flat spacer provided between the seal and the outer side surface to separate the seal from the outer side surface; and an annular recess surrounding the opening is provided on the lower surface of the frame.
The spacer and the seal are provided in an annular recess of the frame,
A closed structure for an opening of a spindle motor, wherein the opening is fitted so as not to protrude from the annular concave portion .