JP3122822B2 - Spindle motor mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor mounting structure for mounting a spindle motor to a disk drive without using a flange.

[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. As shown in FIG. 2, the spindle motor rotatably supports a fixed frame 11 that supports the entire spindle motor 10 on a disk device A such as a magnetic disk device or an optical disk device, and a rotor 12 on which a disk D is mounted. And a bearing case 13. The bearing case 13 is erected on the fixed frame 11. A flange 14 for attaching to the disk device A is formed in a lower portion of the fixed frame 11.

[0004]

However, since such a spindle motor 10 has a height H including the thickness T of the flange 14, the mounting height of the spindle motor 10 is reduced by the thickness T of the flange. There is a problem that can not be.

[0005]

According to the present invention, a bearing is provided.
In a spindle motor having a bearing case which rotatably supports the rotor through the bearing cable
Graphics and pipe-shaped portion having an outer diameter is inserted into the attachment hole of the attachment portion of the formed narrower than the bearing case disk device at one end of the stepped portion of the bearing case includes a flange at one end is screwed into the pipe-shaped portion spins; and a mounting screw for sandwiching the attached part between the flange and the
This problem has been solved by a dollar motor mounting structure.

[0006]

[Action] The pipe-shaped portion is inserted into a hole formed in the mounting portion of the disk device, screwing the screws into the pipe-shaped portion, Beari
A spindle motor is mounted on the disk device with the mounting portion sandwiched between the step portion and the flange of the carrying case.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the spindle motor includes a bearing case 2 for supporting the entire spindle motor 20 on a disk device A such as a magnetic disk device or an optical disk device.
1 and a pair of bearings 22, 2 on which a disk D is mounted.
2 and a rotor 23 rotatably provided on the bearing case 21 by the rotor 2. Rotation of the rotor 23, base
This is performed by the magnetic action of the armature 24 provided on the ringing case 21 and the magnet 25 provided on the inner periphery of the rotor 23.

The spindle motor 20 is mounted on the disk drive A by a mounting structure 30. Mounting structure 30
It is bearing Ke outer diameter at the lower end of the bearing case 21
And a mounting screw 3 screwed into the pipe-shaped part 31 and having a flange 32 at one end.
3 is comprised. A female screw 311 is formed on the inner circumference of the pipe-shaped portion 31, and a male screw 3 is formed on the outer circumference of the mounting screw 33.
31 are formed. The spindle motor 20 is attached to the disk device A by connecting the pipe-shaped portion 31 to the disk device A.
Mounting holes 3 formed in the base plate (attached portion) P
4 without any backlash, and the female screw 31 of the pipe-shaped part 31
Screwing the external thread 331 of the mounting screw 38 to 1, Bearin
This is performed by sandwiching the base plate P between the step portion 211 of the locking case 21 and the flange 32.

When the spindle motor 20 is mounted on the disk drive A by the mounting structure 30 as described above, the following advantages are obtained. (1) Dust flow between the spindle motor 20 and the disk device A can be prevented by the flange 32 of the mounting screw 33, and the performance of the spindle motor 20 and the disk device A can be maintained at a high level. it can. (2) Since the conventionally required flange is not required, the height H of the entire spindle motor 20 can be reduced, and the spindle motor 20 can be made thinner. Specifically, for example, the height of the spindle motor 20 can be reduced to about 1.5 mm, which is the thickness of the flange, and can be reduced to about 9 mm or less. That is, about 15
The percentage can be reduced, which is a remarkable effect in the spindle motor 20, which is required to be thinner for the purpose of downsizing the computer. (3) Spindle motor 2
0 can be reduced in weight and the structure can be simplified. (4) Since the spindle motor 20 can be mounted with one mounting screw 33, the mounting work is short. or,
The replacement of the spindle motor can be performed easily and in a short time.

[0010]

According to the spindle motor mounting structure of the present invention, the following effects can be obtained. (1) With the flange of the mounting screw, the flow of dust between the spindle motor and the disk device can be prevented, and the performance of the spindle motor and the disk device can be maintained at a high level. (2) Since the conventionally required flange is not required, the overall height of the spindle motor can be reduced, and the spindle motor can be made thinner. (3) Since the flange is eliminated, the weight and the structure of the spindle motor can be reduced. (4) Since the spindle motor is mounted with one mounting screw, the mounting operation time can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along an axis of a spindle motor having a mounting structure of the present invention.

FIG. 2 is a sectional view along an axis of a conventional spindle motor.

[Explanation of symbols]

P Base plate (attached portion) 20 Spindle motor 21 Bearing case 22 Rotor 30 Mounting structure 31 Pipe-shaped portion 32 Flange 33 Mounting screw 34 Mounting hole 211 Step

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/00 H02K 21/22

Claims (1)

(57) [Claims] The rotor is rotatable via a bearing.
In a spindle motor having a bearing case for rotatably supporting the outer diameter at one end of the bearing case is the bare
Wherein the attachment in a pipe-shaped portion inserted into the mounting hole of the mounting portion of the formed narrower than the ring casing disk apparatus, the step portion of the bearing case includes a flange at one end is screwed into the tubular portion and the flange A mounting structure for a spindle motor, comprising: a mounting screw for sandwiching a portion.