JP2545557Y2 - Magnetic disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive provided with a motor for rotating a magnetic disk.

[0002]

2. Description of the Related Art A commonly used disk drive has a motor mounting structure as shown in FIG. 2, for example.

First, the motor will be described. As shown in FIG. 2, a pair of bearing ball bearings 2 and 2 are arranged in the hollow direction of a hollow cylindrical bearing holder 1 in the axial direction. together and is fixed by the, the shaft 3 via a pair of ball bearings 2, 2 are rotatably supported. The center of the hub 4 is fitted to one end (the upper end in the figure) of the shaft 3, and the magnetic disk 5 is mounted on the outer peripheral surface of the hub 4.

A flange 4a having an enlarged outer diameter is provided in a skirt shape on the lower side of the hub 4 in the figure, and an annular driving magnet 6 is provided on an inner peripheral wall surface of the flange 4a. is set up. On the other hand, a stator core 7 is fixed to an outer peripheral portion of the bearing holder 1, and an outer peripheral surface of the stator core 7 faces an inner peripheral side of the drive magnet 6. A core winding 8 is loaded on the stator core 7. An opening provided at the lower end of the bearing holder 1 in the figure is provided with a shaft 3.
A magnetic fluid seal 9 is mounted between the outer peripheral wall and the outer peripheral wall.

[0005] Such a disk drive motor is mounted on the main body frame 11. That is, the bearing holder 1 of the disk drive motor is inserted into the mounting hole 11a provided in the main body frame 11, and an adhesive 12 is provided between the inner peripheral surface of the mounting hole 11a and the outer peripheral surface of the bearing holder 1. Is filled. The adhesive 12 seals and seals the space between the main body frame 11 and the bearing holder 1 so that the magnetic disk 5 inside the apparatus is maintained in a clean state.

[0006]

However, when the adhesive 12 is used for mounting the magnetic disk drive motor as in the prior art described above, dirt is easily absorbed when the motor is mounted, and the cleanness is maintained. This is not only unfavorable, but also makes it difficult to remove the motor, which is particularly inconvenient when disassembling and repairing defective products.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic disk drive capable of satisfactorily fixing a motor and a main body frame with a simple configuration.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a motor is provided in a mounting hole provided in a main body frame.
In the magnetic disk drive device in which the bearing holder of the motor is inserted and fixed ,
Between the peripheral wall surface and the peripheral wall surface of the bearing holder of the motor
The elastic seal member is inserted in close contact
, In the outer peripheral wall surface of the bearing holder and the elastic sheet
The threaded portion is formed outside the
The above-mentioned bearing holder and the above-mentioned main body are fastened by a screwed fastening means.
The frame has a fixed configuration.

[0009]

In the means having such a configuration, the bearing holder side and the main body frame side are hermetically sealed and sealed via the elastic sealing member, and the bearing holder side and the main body frame side are tightened by the fastening means. The disk drive motor is fixed in a detachable state so that the disk drive motor can be easily removed.

[0010]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a pair of bearing ball bearings 22, 22 are arranged in the hollow inside of a hollow cylindrical bearing holder 21 in the axial direction.
In addition to being fixed, a shaft 23 is rotatably supported via the pair of ball bearings 22. At one end (the upper end in the figure) of the shaft 23,
A flange-shaped fixed body 23a formed in a large-diameter disk shape is provided integrally, and an attachment hole 24a formed through the center of the hub 24 is fitted into the flange-shaped fixed body 23a. I have. The entire hub 24 is formed in a substantially hollow cylindrical shape, and a magnetic disk 25 is mounted on an outer peripheral surface thereof. A step is formed in the inner peripheral wall of the mounting hole 24a of the hub 24 in the axial direction.
Of the shaft 23 with respect to the stepped portion.
Is fixed so that it can be abutted.

Further, a flange portion 24b having an enlarged outer diameter is provided in a skirt shape on a lower portion of the hub 24 in the figure, and an inner peripheral wall surface of the flange portion 24b has
An annular drive magnet 26 is provided. On the other hand, a stator core 27 is fixed to an outer peripheral portion of the bearing holder 21, and an outer peripheral surface of the stator core 27 faces an inner peripheral side of the drive magnet 26. A core winding 28 is loaded on the stator core 27.

Further, the lower end of the bearing holder 21 shown in the figure is open, and the lower end of the bearing holder 21 is provided with a cap 29 so as to cover the end faces of the shaft 23 and the ball bearing 22. Is fitted. An adhesive 29a is attached to the periphery of the cap 29.
And the cap 29 and the bearing holder 2
1 is hermetically sealed.

Such a disk drive motor is attached to the main body frame 31. That is, first, the main body frame 31 is provided with a mounting hole 31a, and the body of the bearing holder 21 of the disk drive motor is inserted into the mounting hole 31a. In the middle of the body of the bearing holder 21, a locking step 21a swelling toward the outer peripheral side is provided.
The positioning of the motor is performed by abutting the locking step portion 21a on the upper surface side of the main body frame 31 in the figure.

A portion of the body of the bearing holder 21 closer to the lower end in the figure than the locking step 21a passes through the inside of the mounting hole 31a of the body frame 31. In this penetrating portion, the outer diameter of the body of the bearing holder 21 is
It is set slightly smaller than the inner diameter of 1a, and an annular gap is formed between the two. An O-ring 32 as an elastic seal member is inserted in the annular gap. The O-ring 32 is an outer peripheral wall surface of the bearing holder 21,
And it is mounted so as to be in close contact with both the inner peripheral wall surface of the mounting hole 31 a of the main body frame 31.

Further, on the body of the bearing holder 21
The lower end shown in the figure, which is outside the O-ring 32, protrudes downward by a predetermined amount after passing through the mounting hole 31a of the main body frame 31, and a male screw portion is engraved on the outer periphery of the protruding part. ing. A nut 3 as a fastening means is attached to the male screw portion on the bearing holder 21 side.
3 female screw portions are screwed. By the tightening force of the nut 33, the bearing holder 21 of the disk drive motor and the main body frame 31 are detachably fixed.

In the means having such a configuration,
The bearing holder 21 side and the main body frame 31 side are hermetically sealed and sealed by an O-ring 32, whereby the cleanness inside the apparatus, that is, the magnetic disk 25 side is maintained. At the same time, the nut 33 fixes the bearing holder 21 and the main body frame 31 in a detachable state. Therefore nut 3
By loosening and removing the disk 3, the disk drive motor can be easily removed.

The bearing holder 21 and the body frame 3
As means for removably fastening the first side, various kinds of means such as a bayonet-type fixing means can be similarly employed in addition to the nut as in the above embodiment.

[0018]

[Effect of the invention] The invention of the present application is provided on the main body frame.
Insert the motor bearing holder into the mounting hole and secure it.
Magnetic disk drive device,
Inner wall surface of mounting hole and bearing holder of the above motor
The elastic seal member is inserted between the outer peripheral wall of
And the outer peripheral wall of the bearing holder,
In addition, a screw portion is formed outside the elastic seal member.
And the bearing housing is tightened by a fastening means screwed to the screw portion.
Since the holder and the main body frame are fixed , the disk drive motor can be easily removed, for example, when disassembling and repairing a defective product, as compared with a conventional case using an adhesive. It is possible to avoid contamination at the time of assembling or use, and to improve the cleanness particularly on the magnetic disk side. Ma
In addition, with the above-mentioned elastic sealing member,
Tightening means on the thread formed on the outer peripheral surface of the bearing holder
Because the screw is screwed, it is necessary to
The fine chips generated do not enter the motor
Mounting the bearing holder on the body frame
Can be

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting structure of a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view illustrating a mounting structure of a conventional magnetic disk drive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Bearing holder 23 Shaft 24 Hub 25 Magnetic disk 31 Main body frame 31a Mounting hole 32 O-ring 33 Nut

Claims (1)

(57) [Scope of request for utility model registration] 1. A mounting hole provided in a main body frame,
In the magnetic disk drive unit formed by inserting the bearing holder of the motor fixed, and the inner circumferential wall surface of the mounting hole in the main body frame, between the outer peripheral surface of the bearing holder of the motor <br/> over motor, the elastic seal The member is inserted in close contact with the outer peripheral wall surface of the bearing holder , and the elastic seal
A screw part is formed outside the member and screwed to the screw part
The bearing holder and the body frame
A magnetic disk drive, wherein the magnetic disk drive is fixed to the magnetic disk drive.