JP3495084B2 - Spindle motor - 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 mainly used for rotating a recording disk.

[0002]

2. Description of the Related Art In a conventional spindle motor of a shaft rotation type, a rotor shaft is rotatably supported inside a cylindrical portion of a bracket through a pair of bearings, and a stator is fixed to the outer periphery of the cylindrical portion. The rotor magnet of the rotor is arranged on the outside of the so as to face it.

That is, as shown in FIG. 5, the bracket 2 fixed to the base 1 of the hard disk drive is
It is composed of a collar portion 3 and a cylindrical portion 4 on the outer periphery of the lower portion. A step portion 7 for positioning the pair of bearings 5 and 6 is formed in the inner center portion of the cylindrical portion 4, one bearing 5 is internally fitted to the upper end portion of the cylindrical portion 4, and the other bearing 6 is It is fitted in the lower end of the cylindrical portion 4.

Inside the cylindrical portion 4, a pair of bearings 5,
A shaft 8 is rotatably supported via 6. That is, the shaft 8 is inserted inside the inner rings of both bearings 5 and 6, and these inner rings are bonded and fixed to the shaft 8 by applying an appropriate preload.

A hub 9 made of aluminum or the like is fixed to the upper end of the shaft 8 so as to rotate together with the shaft 8. A magnetic disk (not shown) is mounted on the collar portion 10 of the hub 9 and mounted on the hub 9. A cylindrical iron yoke 11 is attached to the lower surface of the collar portion 10 of the hub 9 by shrink fitting or the like, and a rotor magnet 12 is attached to the inner circumference of the yoke 11.

A stator 13 is fixed to the outer periphery of the cylindrical portion 4 of the bracket 2 so as to face the rotor magnet 12. Therefore, the stator 13 and the rotor magnet 14
Due to the electromagnetic interaction between and, the hub 9 rotates about the shaft 8 to rotate the magnetic disk as required.

A cap 14 is arranged below the other bearing 6 so as to close the lower end opening of the cylindrical portion 4. This cap 14 can prevent dust from entering the hard disk. A labyrinth gap is formed over the entire circumference between the outer peripheral surface of the cylindrical portion 4 and the outer peripheral surface of the stator 13, and the lower and inner peripheral surfaces of the hub 9 and the inner peripheral surface of the rotor magnet 12. It has a sealing effect against grease splashing from and unclean air, and prevents these from entering the hard disk.

Three screw holes for fixing the collar portion 3 to the base 1 are formed in the collar portion 3 at equal intervals. Further, as shown in FIG. 6, the coil wire 16 from the stator 13 is attached to the base portion 3. A guide hole 17 for guiding to the back surface of the is transparently provided. An insulating paper 18 is attached to the upper surface of the flange 3 to insulate the coil of the stator 13 from the flange 3, and a through hole corresponding to the guide hole 17 is formed in the insulating paper 18.

The terminal portion 20 of the flexible circuit board 19 is attached to the back surface of the collar portion 3 with an adhesive, and the coil wire 16 from the stator 13 is soldered to the land 21 on the terminal portion 20 through the guide hole 17. There is.

In this case, if the coil wire 16 touches the inner surface of the guide hole 17 or the inner peripheral edge of the lower end, a short circuit may occur. Therefore, conventionally, an insulating tube 22 made of rubber or the like is fitted inside the guide hole 17, The coil wire 16 is passed through the insulating tube 22 to maintain the insulation of the coil wire 16.

Alternatively, as shown in FIG. 7, at the position of the guide hole 17 of the insulating paper 18 provided on the upper surface of the collar portion 3, an inner cylindrical portion 23 fitted inside the guide hole 17 is formed. In the terminal portion 20 of the flexible circuit board 19, a regulation hole 24 that is located substantially on the axis of the guide hole 17 and whose inner diameter is sufficiently smaller than the inner diameter of the guide hole 17 is formed by cutting out to the tip side.

The coil wire 16 from the stator 13
Is inserted into the inner cylindrical portion 23 of the insulating paper 18, is further regulated by the regulation hole 24, and is positioned substantially on the axial center line of the guide hole 17, and the coil wire 16 is formed on the inner peripheral surface and the lower end peripheral edge of the guide hole 17. I try not to touch them.

[0013]

However, in such a conventional structure, in order to secure the insulation of the coil wire 16, the insulating tube 22 is required or the special insulation having the inner tubular portion 23 is provided. It is necessary to use a special flexible circuit board 19 on which the paper 18 and the regulation hole 24 are formed,
As the number of parts increases, the number of man-hours for assembling the parts increases and the workability deteriorates.

The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to insulate the extraction coil wire by a simple operation without increasing the number of parts. It is to provide a spindle motor that can be reliably secured.

[0015]

In order to achieve the above object, a spindle motor according to the present invention is rotatable via a stator fixed to the outer periphery of a cylindrical portion of a bracket and a pair of bearings inside the bracket. A shaft supported by the rotor, a rotor fixed to the shaft, a rotor magnet disposed at a position facing the stator of the rotor, and a bracket provided on the outer periphery of the base of the cylindrical portion for mounting on the base. A flange portion and a guide hole for the coil wire from the stator, which is provided through the collar portion, are provided, and a substantially cylindrical insulating bush is fitted in an arbitrary slot of the stator in the axial direction of the stator, and The lower end portion of the insulating bush is inserted into the guide hole, and the coil wire is drawn through the insulating bush to the outside of the flange portion.

In this case, the insulating bush has an outer flange portion at the upper end that engages with the upper surface of the stator core of the stator, a large-diameter portion of the mid-side that is inserted into an arbitrary slot, and a small-diameter portion of the lower portion that fits inside the guide hole. It is desirable to be composed of parts.

In addition, a slit is formed in the insulating bush in the radial direction on the radial opening side of an arbitrary slot, and a coil wire is inserted through the slit from the slit, and then the insulating bush is fitted into the arbitrary slot. By inserting, it is preferable that the slit of the insulating bush is contracted or closed, and in particular, at the positions of both side edges of the slit inside the insulating bush, inwardly projecting protrusions are provided in the axial direction, It is more preferable to prevent the coil wire inserted into the insulating bush from coming off from the slit by this protrusion.

[0018]

In the spindle motor of the present invention, when the coil wire from the stator is pulled out to the back side of the flange portion through the guide hole, the insulating bush having the coil wire inside is inserted into any slot of the stator. Then, the lower end portion of the insulating bush is inserted into the guide hole of the flange portion, and the coil wire is pulled out without contacting the inner peripheral surface of the guide hole.

Further, the insulating bush is provided with an outer flange portion at an upper end which engages with the upper surface of the stator core of the stator, a large diameter portion of a middle portion which is inserted into an arbitrary slot, and a small diameter portion of a lower portion which is fitted inside the guide hole. If it is composed of and, the fixing of the insulating bush becomes reliable.

Further, if a slit is formed in the insulating bush in the radial direction in the radial direction of the arbitrary slot, the coil wire can be easily inserted into the insulating bush, and the insulating bush can be inserted into the arbitrary direction. Since the slit of the insulating bush is contracted or closed by being inserted into the slot, the coil wire is prevented from coming off, and in particular,
If projections projecting inward are provided in the axial direction on both sides of the slit inside the insulation bush, the projection prevents the coil wire from coming off the slit when the insulation bush is inserted. To be prevented.

[0021]

EXAMPLES Next, examples of the present invention will be described with reference to FIGS. The same reference numerals as those used in the related art denote the same or corresponding ones.

FIG. 1 is a sectional view of a spindle motor according to the present invention. The flange 13 of the bracket 2 has a stator 13
A guide hole 17 for guiding the coil wire 16 is provided so as to be axially opposed to an arbitrary slot of the stator 13.

An insulating bush 25 made of resin as shown in FIG. 4 is fitted and inserted into this arbitrary slot. That is, the insulating bush 25 is formed in a substantially cylindrical shape, and has an outer flange portion 26 at an upper end portion that abuts on an upper surface of the stator core of the stator 13 and a large-diameter portion 27 that is a middle portion to be inserted into an arbitrary slot.
And a small-diameter portion 28 at the lower part that is inserted into the guide hole 17.

An axial slit 29 is formed at an appropriate position on the peripheral wall of the insulating bush 25, whereby the insulating bush 2 is formed.
5 is formed with elasticity to allow inward contraction, and
At the positions of both side edges of the slit 29 on the inner peripheral surface of the insulating bush 25, respectively, the protrusions 3 protruding inward are long in the axial direction.
0 is provided.

The outer flange portion 26 and the large diameter portion 27 are deviated from the small diameter portion 28 in the direction of the slit 29, and the slits 29 in the outer collar portion 26 and the large diameter portion 27 have outer openings in the outer peripheral direction. Has been expanded to.

The coil wire 16 from the stator 13 is inserted through the slit 29 inside the insulating bush 25 outside the stator 13, and the insulating bush 25 through which the coil wire 16 is inserted is slit 29 in any slot of the stator 13. Is outwardly inserted in the radial direction of the slot from above. The small diameter portion 28 of the insulating bush 25 is loosely inserted into an arbitrary slot, and then inserted into the guide hole 17 of the collar portion 3,
The large diameter portion 27 is fitted in an arbitrary slot, and the outer flange portions 26 are brought into contact with the upper surfaces of the teeth outer peripheral portion of the stator core on both sides of the arbitrary slot.

When the insulating bush 25 is fitted and inserted, the coil wire 16 may come out of the slit 29, but the protrusions 30 on both sides of the slit 29 prevent the coil wire 16 from moving to the slit 29, and the coil wire 16 is prevented from moving. The disconnection of 16 from the insulating bush 25 is prevented. Further, when the insulating bush 25 is inserted, the outer diameter of the large diameter portion 27 is formed to be larger than the inner diameter of an arbitrary slot after winding, so that the large diameter portion 2
7 contracts inward due to the elasticity of the slit 29, and the slit 29 is substantially closed.

After the insulation bush 25 is fitted and inserted, the coil wire 16 led out below the collar portion 3 from the insulation bush 25 is soldered to the flexible circuit board 19. In FIG. 1, reference numeral 31 is a guide groove formed on the upper surface of the base 1, and the circuit board 19 is arranged in the guide groove 31 and connected to a connector (not shown).

In the spindle motor having such a structure, the coil wire 16 from the stator 13 is provided in the stator 13.
Of the insulating bush 13 is inserted and pulled out, and the lower end of the insulating bush 25 is inserted into the guide hole 17 of the collar 3. Since it never touches the inner peripheral surface and the peripheral edge of the lower end, the insulating performance can be improved without using the conventional insulating tube, special insulating paper, or special flexible circuit board.

In addition, since the slit 29 is formed in the insulating bush 25 in the axial direction and the slit 29 is closed only when the slit 29 is inserted into the slot, the work of inserting the coil wire 16 into the insulating bush 25 is extremely difficult. Easy to
The workability is greatly improved, and since the protrusions 30 are provided on both sides of the slit 29 in particular, there is a concern that the coil wire 16 may come off during the work after the insertion of the coil wire 16 into the insulating bush 25 and the insertion into the slot. There is no

Although the embodiment of the spindle motor according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the present invention. For example, when the insulating bush 25 is fitted into the slot, the slit 29 does not necessarily have to be completely closed, and there may be some gap, and the coil wire 1 is formed by the both protrusions 30 provided on both sides of the slit 29.
6 can be prevented from separating from the insulating bush 25.

[0032]

Since the present invention is constructed as described above, it has the following effects. When pulling out the coil wire from the stator to the back side of the flange through the guide hole, insert the insulating bush with this coil wire inside into the arbitrary slot of the stator and guide the lower end of the insulating bush to the flange. Since the coil wire is configured to be inserted into the hole, the coil wire is prevented from coming into contact with the inner peripheral surface and the lower end peripheral edge of the guide hole, and the effect of improving the insulation performance is obtained.

Further, the insulating bush is provided with an outer flange portion at an upper end which engages with the upper surface of the stator core of the stator, a large diameter portion of a middle portion which is inserted into an arbitrary slot, and a small diameter portion of a lower portion which is fitted inside the guide hole. With the configuration, the positioning and fixing of the insulating bush can be surely performed.

Furthermore, if a slit is formed in the insulating bush in the radial direction of the slot in the radial direction, the coil wire can be easily inserted into the insulating bush and the workability is greatly improved. Moreover, since the slit of the insulating bush is contracted or closed by inserting the insulating bush into an arbitrary slot, the coil wire is prevented from coming off, and particularly, at the positions of both side edges of the slit inside the insulating bush, When the protrusion protruding inward is provided in the axial direction, the protrusion prevents the coil wire from being detached from the slit when the insulating bush is inserted.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a spindle motor according to the present invention.

FIG. 2 is a plan view of the insulating bush in FIG.

FIG. 3 is a side view of FIG.

FIG. 4 shows the insulating bush of FIG. 1, (a) is a plan view,
(B) is a front view and (c) is a side view.

FIG. 5 is a sectional view of a conventional spindle motor.

6 is a cross-sectional view showing a coil wire lead-out portion in the bracket of FIG.

FIG. 7 is a cross-sectional view showing another coil wire drawing portion in the bracket of FIG.

[Explanation of symbols]

2 bracket 3 collar part 4 Cylindrical part 12 rotor magnet 13 Stator 16 coil wire 17 Guide hole 25 insulating bush 26 Outer collar part 27 Large diameter part 28 Small diameter part 29 slits 30 protrusions

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Claims (4)

(57) [Claims] 1. A stator fixed to the outer periphery of a cylindrical portion of a bracket, a shaft rotatably supported inside the bracket via a pair of bearings, a rotor fixed to the shaft, and a rotor of the rotor. A rotor magnet disposed at a position facing the stator, a flange portion for mounting the bracket on the outer periphery of the base portion of the cylindrical portion to the base, and a stator transparently provided on the flange portion. A spindle motor including a guide hole for a coil wire, wherein a substantially cylindrical insulating bush is fitted in an axial direction of the stator in an arbitrary slot of the stator, and a lower end portion of the insulating bush is A spindle motor, which is inserted into a guide hole, and wherein the coil wire is drawn out of the flange portion through the insulating bush. 2. The insulating bush fits inside the guide hole and an outer flange portion at an upper end that engages with an upper surface of a stator core of the stator, a large-diameter portion of a middle portion that is fitted into the arbitrary slot, and the guide hole. The spindle motor according to claim 1, wherein the spindle motor comprises a lower diameter portion. 3. The insulating bush has a slit formed in the axial direction on the opening side in the radial direction of the arbitrary slot, and the coil wire is inserted into the insulating bush from the slit, and then the insulating bush is inserted. The spindle motor according to claim 1, wherein the slit of the insulating bush is contracted or closed by inserting the bush into the arbitrary slot. 4. An inwardly projecting projection is axially provided inside the insulating bush at both side edges of the slit, and the projection is inserted through the slit into the insulating bush. The spindle motor according to claim 3, wherein detachment of the coil wire is prevented.