KR20130098583A - One body type chucking apparatus and spindle motor using the same - Google Patents

Abstract

PURPOSE: An integrated chucking device and a spindle motor using the same simplify a manufacturing process by treating the chucking device as a single unit. CONSTITUTION: A spindle motor includes a main body (10), a rotary shaft (20), a rotor (30), a stator (40), and a chucking device (50). The rotary shaft is supported at the center of the main body to be rotated. The rotor is arranged on the outer surface of the stator at a constant gap and includes a rotor housing connected to the rotary shaft. The rotor housing is made of magnetic materials to play a role as a back yoke of a magnet. The chucking device is installed on the rotor housing and fixes a disk. The chucking device is made of synthetic resin materials and is integrally formed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated chucking apparatus and a spindle motor using the same,

The present invention relates to an integrated chucking device and a spindle motor for high speed rotation using the same.

In general, optical disc players such as LDP, CDP, CD-ROM and DVD-ROM players, DVD players, BDs, 3D players, etc., clamp a mounting hole formed through the center of the disc while loading the disc on the turntable by a loading mechanism. An apparatus for reproducing information recorded on a disk by an optical pickup unit which is clamped and clamped as a chuck, and which is moved in the radial direction while rotating the disk clamped to the chuck in one direction by a drive source of a spindle motor as a driving means.

The spindle motor maintains a fixed contact section between the bearing and the rotating shaft to rotatably support the rotating shaft, thereby maintaining a high degree of rotational characteristics, thereby requiring hard disk drives (HDD), optical disk drives (ODD) and other high speed rotations. Is widely used as a driving means of a recording medium.

Spindle motors that require such high-speed rotation are required to be thinned and lightweight in order to respond to the development of electronic devices that are miniaturized day by day. Such spindle motors are disclosed in Laid-open Patent Publication No. 10-2011-0092634.

A conventional spindle motor disclosed in Japanese Laid-Open Patent Publication No. 10-2011-0092634 includes: a rotating shaft serving as a rotation center of a motor; a bearing in which a rotating shaft is rotatably inserted; a bearing housing having a bearing frame formed on an outer peripheral surface thereof; A rotor including a rotor yoke rotating integrally and having a step, a stopper coupled to the step, and a stator disposed around the bearing housing and rotating the rotor. And, inside the upper surface of the rotor yoke is provided with a chucking device for fixing the disk.

The chucking device includes a chuck case fixed to an outer circumferential surface of a rotor yoke on which a rotating shaft is fixed, a disk chuck radially arranged on the chuck case to fix a disk, and a spring installed inside the chuck case to provide elastic force to the disk chuck. .

Since the chucking device is composed of a chuck case, a disk chuck and a spring, the structure is complicated, and since the assembly process for assembling each component is required, manufacturing cost increases.

Korean Patent Publication No. 10-2011-0092634

Accordingly, an object of the present invention is to provide an integrated chucking device and a spindle motor using the same, which can simplify the manufacturing process by integrally forming the chucking device as one component and reduce the manufacturing cost.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

In order to achieve the above object, the spindle motor of the present invention is disposed with a main body, a rotating shaft rotatably supported at the center of the main body, a stator fixed to the outer peripheral surface of the main body, and a predetermined gap on the outer peripheral surface of the stator. And a rotor having a rotor housing connected to the rotating shaft, and a chucking device installed on the rotor housing to fix the disk, wherein the chucking device is integrally formed of a synthetic resin material.

The rotor housing of the present invention is made of a synthetic resin material, which is injection molded by a mold, and serves as a turntable for seating the disc, and a magnet mounting portion bent downward from the edge of the disc to mount the magnet and the back yoke; It characterized in that it comprises a rotary shaft fixing portion extending in the upper direction from the center of the disc portion is fixed to the rotating shaft.

The chucking device of the present invention is a body portion fixed to the outer peripheral surface of the rotating shaft fixing portion of the rotor housing, a plurality of extensions extending at intervals from the outer peripheral surface of the body portion, the elastic force providing portion extending in the circumferential direction at the end of the extension portion And a disk support part formed at the end of the elastic force providing part and supported by the inner circumferential surface of the disk.

The elastic force providing unit of the present invention has a space between the outer circumferential surface of the body portion and is characterized in that a curved surface is formed along the circumferential direction.

A second inclined surface is formed on a lower surface of the disk support of the present invention, and a first inclined surface in contact with the second inclined surface is formed on an upper surface of the guide protrusion protruding from the upper surface of the disc portion of the rotor housing.

As described above, the spindle motor of the present invention has the advantage that the chucking device is integrally formed as one unit, which can reduce the number of parts, simplify the manufacturing process, and further reduce the manufacturing cost.

In addition, there is an advantage that the assembly process can be simplified because the chucking device that is a single product is assembled to the rotor housing once.

1 is a cross-sectional view of a spindle motor according to an embodiment of the present invention.
2 is a cross-sectional view of a disk loaded state in a spindle motor according to an embodiment of the present invention.
3 is a top view of the spindle motor according to an embodiment of the present invention.
4 is a top view of a disk loaded state in a spindle motor according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

The spindle motor of the present invention can be applied not only to a spindle motor requiring high speed rotation but also to a low speed rotation motor, and to both a brushless DC motor or a DC motor.

1 is a cross-sectional view of a spindle motor according to an embodiment of the present invention, Figure 2 is a cross-sectional view of a disk loaded state in a spindle motor according to an embodiment of the present invention.

1 and 2, a spindle motor according to an embodiment of the present invention is fixed to a main body 10, a rotating shaft 20 rotatably supported by the main body 10, and a rotating shaft 20. The rotor 30 rotated together, the stator 40 disposed at a predetermined gap on the inner surface of the rotor 30 and fixed to the main body 10, and connected to the rotor 30 to rotate together and rotate the disk 100. And a chucking device 50 for fixing.

A bearing 60 is installed between the main body 10 and the rotating shaft 20 to rotatably support the rotating shaft 20. The bearing mounting part 16 to which the bearing 60 is mounted is formed in the main body 10, and the rotating shaft 20 is rotatably supported on the inner surface of the bearing 60.

The bearing 60 may be an oilless bearing made of, for example, oil-containing sintered metal, and is formed in a cylindrical shape. That is, a metal bearing in which a porous copper alloy (brass system) is permeated with oil can be used.

A base plate 12 is coupled to the lower outer peripheral surface of the main body 10. The base plate 12 may be formed in various shapes so as to be fixedly mounted on various disk drive devices in which the spindle motor is installed.

The main body 10 can be manufactured by an injection molding method using a thermosetting resin such as nylon 66 or an engineering plastic material such as polycarbonate (PC) or a thermoplastic resin.

The base plate 12 is disposed below the stator 40, and a printed circuit board (PCB) 14 that applies a driving signal to the stator 40 is fixed to the upper surface thereof by a caulking method. Then, a driving signal for controlling the spindle motor from the disk drive apparatus main body is applied to the printed circuit board (PCB) 14.

The base plate 12 is preferably made of a lightweight material such as aluminum or an aluminum alloy or an iron-based alloy, but may be made of another metal material or synthetic resin. In addition, the base plate 12 may be integrally molded with the main body 10 by insert injection or insert molding at the time of manufacturing the main body 10 that is injection molded using a thermoplastic or thermosetting resin.

An engaging groove 22 is formed on the lower circumferential surface of the rotary shaft 20 and is inserted into the engaging groove 22 of the bearing mounting portion 16 of the body 10 to prevent the rotary shaft 20 from rising. a slit washer 24 is disposed.

That is, the rotary shaft 20 is engaged by the sleeve washer 24, thereby preventing the rotary shaft 20 from rising during high-speed rotation of the spindle motor.

The stator 40 includes a core 42 having a plurality of teeth protruded from a ring-shaped body in the radial direction, a bobbin 44 which is installed on the outer peripheral surface of the core 42 and is made of an insulator, As shown in Fig.

The rotor 30 includes a rotor housing 32 connected to the rotary shaft 20 and rotatable together with the rotor housing 32. N and S poles are alternately arranged on the inner peripheral surface of the rotor housing 32, And a magnet (34).

The rotor housing 32 is a disc part 70 which serves as a turntable for fixing and seating the disc 100 in which data is stored, and is bent downward from the edge of the disc part 70 so that the magnet 34 and the back yoke ( 36 includes a magnet mounting portion 72 to be mounted, and a rotating shaft fixing portion 74 extending upward from the center of the disc portion 70 to fix the rotating shaft 20.

The rotor housing 32 is preferably made of a magnetic material so as to serve as a back yoke to the magnet 34.

Here, the disk portion 70, the magnet mounting portion 72, and the rotation axis fixing portion 74 are integrally formed.

As shown in FIGS. 3 and 4, the chucking device 50 includes a body part 52 that is fitted to an outer circumferential surface of the rotation shaft fixing part 74 of the rotor housing 32, and a circumferential direction of the body part 52. A plurality of extension portions 54 protruding at intervals, the elastic force providing portion 56 extending in the circumferential direction at the end of the extension portion 54 to provide an elastic force, and the elastic force providing portion 56 The disk support 58 is formed at the end and is in contact with the inner surface of the disk 100.

Since the chucking device 50 is integrally formed as a single piece and coupled to the rotor housing 32, the chucking device 50 may reduce the manufacturing process, greatly shorten the assembly process, and further reduce the manufacturing cost.

The chucking device is manufactured in one step by injection molding of a synthetic resin material.

The body portion 52 is formed in a disc shape having a predetermined thickness so that its inner circumferential surface is fixed to the outer circumferential surface of the rotation shaft fixing portion 74 of the rotor housing 32.

The extension part 54 is formed to extend three in the drawing at intervals on the outer circumferential surface of the body part 52 to support the elastic force providing part 56 when the elastic force providing part 56 is bent. Of course, the number of extensions 54 may be two, three or more.

The elastic force providing unit 56 provides an elastic force to the disk support unit 58 when the disk 100 is inserted into the disk support unit 58 to hold concentricity when the disk is seated. The outer circumferential surface of the body unit 52 is provided. It is formed in the shape of an arc disposed in the circumferential direction with a certain space 94 to provide an elastic force in the radial direction to the disk support 58.

The disk support 58 is a portion that protrudes outward from the end of the elastic force providing portion 56 to directly contact the inner surface of the disk 100. In addition, the disc part 70 has a guide protrusion 94 which protrudes upward in the circumferential direction to guide the disk support 58 to be linearly moved, and has a first inclined surface on the upper surface of the guide protrusion 94. 90 is formed, and the second inclined surface 92 in contact with the first inclined surface 90 is formed on the lower surface of the disk support 58.

As such, since the second inclined surface 92 slides along the first inclined surface 90, the disc support 58 reciprocates in a straight line so that the disc 100 can be loaded at the correct position.

Then, when the disk is rotated, the centrifugal force acts on the elastic force providing unit 56 and the disk support unit 58, whereby the disk can be more firmly fixed by the centrifugal force.

An anti-slip sheet 80 is attached to the upper surface of the disc portion 70 to prevent the disc 100 from sliding in the circumferential direction.

The anti-slip sheet 80 is formed in a ring shape and the same height as a whole, and a plurality of anti-slip protrusions 82 are formed on the upper surface of the anti-slip sheet.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10: Body 12: Base plate
14; Printed circuit board 20:
22: Hanging groove 24: Sliding washer
30: rotor 32: rotor housing
34: Magnet 36: Back York
40: stator 42: core
44: bobbin 46: coil
50: chucking device 52: main body
54: extension portion 56: elastic force providing portion
58: disc support 60: bearing
70: disc portion 72: magnet mounting portion
74: rotating shaft fixing portion 80: slip sheet
90: first inclined plane 92: second inclined plane
94: guide projection

Claims (9)

A rotor having a main body, a rotating shaft rotatably supported at the center of the main body, a stator fixed to an outer circumferential surface of the main body, a rotor housing disposed at a predetermined gap on an outer circumferential surface of the stator, and connected to the rotating shaft; A chucking device installed in the rotor housing to fix the disk,
The chucking device is a spindle motor, characterized in that integrally molded with a synthetic resin material. The method of claim 1,
And the rotor housing is formed of a magnetic forming material to serve as a back yoke of the magnet. The method of claim 1,
The rotor housing and the disk portion that serves as a turntable for seating the disk;
A magnet mounting portion bent downward from an edge of the disc portion to which a magnet and a back yoke are mounted;
Spindle motor, characterized in that it comprises a rotary shaft fixed portion extending from the center of the disc portion in the upward direction fixed to the rotating shaft. The method of claim 1,
The chucking device and the body portion is fixed to the outer peripheral surface of the rotating shaft fixing portion of the rotor housing;
An extension part extending in plurality at intervals from an outer circumferential surface of the body part;
An elastic force providing portion extending in the circumferential direction at the end of the extension portion to hold the concentric when the disc is seated;
And a disk support part formed at an end of the elastic force providing part and supported by an inner circumferential surface of the disk. 5. The method of claim 4,
The elastic force providing portion has a space between the outer circumferential surface of the body portion and forms a curved surface along the circumferential direction, and the disk support portion protrudes outward from the end portion of the elastic force providing portion so that when the disk is rotated, centrifugal force acts to further strengthen the disk. Spindle motor, characterized in that fixed. 5. The method of claim 4,
A second inclined surface is formed on the lower surface of the disk support,
Spindle motor, characterized in that the first inclined surface in contact with the second inclined surface is formed on the upper surface of the guide projection protruding on the upper surface of the disc portion of the rotor housing. A body part fixed to an outer circumferential surface of the rotating shaft fixing part of the rotor housing;
An extension part extending in plurality at intervals from an outer circumferential surface of the body part;
An elastic force providing part extending in the circumferential direction at the end of the extension part and holding concentricity when the disc is seated;
A disk support part formed at an end of the elastic force providing part and supported by an inner circumferential surface of the disk;
The elastic force providing unit and the disc support unit integral chucking device characterized in that the centrifugal force generated during rotation to hold the disc. The method of claim 7, wherein
The elastic force providing unit is a unitary chucking device, characterized in that having a space between the outer peripheral surface and the body portion is formed in the circumferential direction curved. The method of claim 7, wherein
A second inclined surface is formed on the lower surface of the disk support,
An integrated chucking device, characterized in that the first inclined surface in contact with the second inclined surface is formed on the upper surface of the guide protrusion protruding from the upper surface of the disc portion of the rotor housing.

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