JP2540970Y2 - Disk drive 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 disk drive motor, and more particularly, to a structure of a rotor portion thereof.

[0002]

Examples of a conventional disk drive motor 3
Shown in In FIG. 3 , two ball bearings 36 are mounted around a rotation drive shaft 35 of the motor.
The core 34 is fixed to the outer periphery of the ball bearing 36. The core 34 has a plurality of salient poles, and a coil is wound around each salient pole. The ball bearing 3 is provided on the rotating shaft 35.
Above 6, a cup-shaped rotor case 30 is fitted and fixed.

The rotor case 30 is integrally formed of a magnetic material such as iron, and has a flat portion 37 extending in a direction perpendicular to the rotation drive shaft 35 and a cylindrical hub base 3 projecting upward from the outer peripheral portion.
1 and a cylindrical case portion 39 protruding downward from the outer peripheral portion. The chucking magnet 32 is fixed to the upper surface of the flat portion 37. A drive magnet 33 is fixed to the inner peripheral side of the case portion 39. The outer peripheral surface of the stator core 34 and the inner peripheral surface of the driving magnet 33 face each other with a gap.

The upper surface of the hub base 31 is a contact surface 38 with the optical disk, and the contact surface 38 is lace-processed and precision finished. The rotor case 30 also functions as a yoke for the chucking magnet 32 and the drive magnet 33.

[0005]

[Problems to be Solved by the Invention] When the rotor case is integrally formed with the case portion 39 for mounting the driving magnet 33 and the hub base 31 as in the above-mentioned conventional example, the disk of the hub base 31 is When the rotary drive shaft 35 is held by the chuck of the processing machine in order to finish the contact surface 38, the case portion 39 interferes with the chuck, and the rotary drive shaft 35 cannot be held to the root by the chuck. In this case, the hub base 31 is blurred and the processing accuracy is reduced. In addition, since the rotor case is integrally formed, once formed, the thickness of the case portion 39 cannot be changed, and it cannot be used for a motor having a different specification. Further, the chucking magnet 32 is connected to the rotor.
When fixing to the flat portion 37 of the case 30, an adhesive is used.
Bonding process and drying process
Need. Moreover, if the bonding strength is insufficient,
The chucking magnet 32 rotates when the disk is
There is a possibility that it will be separated from the case 30.

The present invention has been made in order to solve such a problem, and the rotor case , the hub base, and the boss yoke are configured as independent parts , respectively, and the common use of the parts is achieved. together, eliminating restrictions on attachment to the worktable during finishing hub seat disc contact portion, it is possible to increase the machining accuracy by firmly holding the hub seat, further
Then, use a part of the hub base to attach a chucking magnet
By holding it, chucking can be performed without using an adhesive
And an object thereof is to provide a disk drive motor that can be reliably fix the grayed magnet.

[0007]

Means for Solving the Problems To achieve the above object, the present invention provides a drive magnet provided at a position facing a stator core, a rotor case mounted on the outer periphery of the drive magnet, and a disk. A disk drive motor comprising a hub base to be mounted, a boss yoke mounted on the inner peripheral side of the hub base and inserted into a rotary drive shaft, and a chucking magnet mounted on the boss yoke for magnetically attracting a disk. The rotor case is mounted and integrated on the side opposite to the disk mounting side of the hub base in the axial direction, and the chucking magnet is held and integrated by a part of the hub base and the boss yoke.

[0008]

[Operation] The rotor case, the hub base, and the boss yoke are made in advance as separate members. The rotary drive shaft is held by the chuck of the processing machine in a state where the hub base is integrated with the boss yoke and fixed to the rotary drive shaft. Since the rotary drive shaft is held by the chuck without the hub base and rotor case being integrated, the rotor case does not hinder the holding of the rotary drive shaft by the chuck, and the chuck is held at the root of the rotary drive shaft by the chuck. With this, the disk contact surface of the hub stand can be machined. The chucking magnet is part of the hub base and
And fixed integrally to the boss yoke.
Of the chucking mug
Ensure that the net does not peel from the boss yoke
be able to.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Bosuyo a flat dish-shaped at one end of the rotary drive shaft 16 in FIG. 1
The boss 17 is fixed to the outer peripheral wall of the boss yoke 17.
Phosphorus made of iron or stainless steel (such as SUS416)
Grayed-shaped hub base 11 is fixed. The outer peripheral portion of the hub stand 11 protrudes above the outer peripheral wall of the boss yoke 17, and the upper surface of this protruding portion has a contact surface 2 with which the hub of the optical disk contacts.
It is 3. A chucking magnet is provided on a flat portion 17a of the boss yoke 17 in a direction orthogonal to the rotation drive shaft 16.
12 are attached.

A cylindrical rotor case 14 is attached to a lower portion of the outer side of the hub base 11 on a side opposite to the optical disk mounting side. A driving magnet 13 is attached to an inner peripheral portion of a cylindrical rotor case 14 extending downward from the hub base 11 . The outer peripheral surface of the stator core 15 faces the inner peripheral surface of the driving magnet 13 with an appropriate gap. The stator core 15 is fixed to the cylindrical portion of the frame 7, and a pair of bearings 8 on the inner peripheral side of the cylindrical portion of the frame 7.
The rotary drive shaft 16 is rotatably supported via the shaft 8.

Here, the hub base 11 and the rotor case 14
And the boss yoke 17 are configured as separate parts,
As shown in FIG. 2 , the boss yoke 17 and the hub base 11 are integrally formed when the contact surface 23 to the magnetic disk is raced.
The rotary drive shaft 16 can be held by the chuck 25 up to the base of the hub base mounting portion. Assuming that the rotor case 14 is attached integrally with the hub base 11 ,
The chuck 25 hits the rotor case 14 and the rotary drive shaft
16 can be held by the chuck. By holding the rotation drive shaft 16 at the root thereof with the chuck 25 as described above, it is possible to securely fix the disk drive, and to realize high-precision processing without shaking when cutting the optical disc contact surface 23 with the cutting tool 24.

In addition, by configuring the hub base 11 and the rotor case 14 as separate parts, the hub base 11 can be used as a common part, and the rotor case 14 can be replaced for each disk rotation drive having a different size. .

Further, the hub base 11 is constituted by a separate component to the portion of the direction of Bosuyoku 17 perpendicular to the rotation drive shaft 16, the outer peripheral edge portion of the chucking magnet 12 arranged on the upper surface of Bosuyoku 17 that is write Marete fixed sandwiched from top eaves-shaped portion of the hub base 11. this
As described above, by making the hub base 11 a part independent of the boss yoke 17 , the hub base 11 can be used as a common part and the boss yoke 17 can be changed in accordance with the specifications.

A part of the hub base 11 and the boss yoke 1
Chi crowded scissors chucking magnet 12 between 7
Since the chucking magnet 12 can be fixed to the boss yoke 17, the chucking magnet 12 can be fixed using an adhesive.
There is no need to fix the cassette 12 to the boss yoke 17, and the bonding step of the chucking magnet 12 during assembly and the drying
The drying step can be omitted, and peeling of the chucking magnet during operation can be reliably prevented.

Incidentally, the boss yoke 17 can be used by plating an iron-based material. If aluminum or brass is used as the material of the hub base 11, there is an advantage that it can be easily processed and a rust prevention effect can be obtained without plating. If the hardness can be maintained, the hub base may be formed of resin.

[0016] Incidentally, the illustrated embodiment has been configured for an optical disk, the present invention is not limited to the optical disc, it can be applied to any other disk drive.

[0017]

According to the invention present devise, since the rotor case and the hub seat and Bosuyoku a separate component, subjected to finishing hub seat disc contact surface with no mounting the rotor case to the hub seat be able to. Therefore,
The chuck of the processing machine can hold up to the root of the rotary drive shaft, realizing a firm holding on the processing table, and enabling extremely high-precision finishing. Further, forming one component from a plurality of components as described above leads to the common use of components, and it is possible to use the disk for other disks having different physical sizes. Also, since the chucking magnet is sandwiched between the boss yoke and part of the hub that supports the disk, it is not necessary to attach the chucking magnet.
Rutotomoni, the peeling of the chucking magnet certainly can
Ru can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing an embodiment of a rotor of a disk drive motor according to the present invention.

FIG. 2 shows a disk contact surface of the rotor according to the embodiment .
FIG. 4 is a cross-sectional front view showing a state of processing of FIG.

FIG. 3 shows an example of a rotor of a conventional disk drive motor.
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Hub stand 12 Chucking magnet 13 Drive magnet 14 Rotor case 15 Stator core 16 Rotation drive shaft 17 Boss yoke

Continuation of front page (56) References JP-A-3-273855 (JP, A) JP-A-63-274351 (JP, A) JP-A-2-110981 (JP, U) JP-A-3-11356 (JP, A) , U) Japanese Utility Model 3-40868 (JP, U) Japanese Utility Model Utility Model 3-50971 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A drive magnet provided at a position facing a stator core, a rotor case mounted on an outer periphery of the drive magnet, a hub table on which a disk is mounted, and an inner peripheral side of the hub table. And a chucking magnet mounted on the boss yoke and magnetically attracting a disk, wherein the disk drive motor is axially opposite to the disk mounting side of the hub base. A disk drive motor, wherein the rotor case is attached to the side and integrated, and the chucking magnet is sandwiched between a part of the hub base and the boss yoke.