KR20130021778A

KR20130021778A - Spindle motor

Info

Publication number: KR20130021778A
Application number: KR1020110084248A
Authority: KR
Inventors: 김재영
Original assignee: 엘지이노텍 주식회사
Priority date: 2011-08-24
Filing date: 2011-08-24
Publication date: 2013-03-06

Abstract

PURPOSE: A spindle motor is provided to mechanically combine a yoke and turn-table, thereby enhance the combining power between the yoke and turn-table. CONSTITUTION: A bearing assembly(20) comprises a bearing and a bearing housing(24) in which the bearing is contained. A stator(30) is fixed around the bearing housing. The stator comprises a core(32) and a coil(34) which is wound to the coil. A yoke is combined to a rotary shaft(10). A magnet comprises the core and the magnet arranged in an inner side of the yoke which is an opposite direction. A turn-table(70) is combined to the yoke. A first combining unit is formed in the yoke. The turn-table forms a second combining unit which is combined to the first combining unit.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

In recent years, optical drive devices (ODDs) for recording data on optical disks or reading data recorded on optical disks have been widely used.

In general, an optical drive device includes a spindle motor for rotating an optical disk at high speed, an optical pickup module for reading data from or rotating data on a rotating optical disk, and a stepping motor for driving the optical pickup module. .

The spindle motor for rotating the optical disk at high speed operates with a rotating shaft, a bearing housing accommodating a bearing supporting the rotating shaft, a stator including a core wound around the bearing housing, a stator including a coiled winding coil, and a yoke and a stator coupled to the rotating shaft. The rotor includes a magnet and a turn table disposed on an upper surface of the yoke and coupled to the rotating shaft and the yoke.

Conventional turntables are press-fitted to the rotating shaft to reinforce the mechanical strength of the spindle motor, and are coupled to the turntable by gluing to the yoke.

However, due to the miniaturization of the spindle motor and the improvement of performance, there are various limitations in sufficiently securing the contact area of the turntable and the rotating shaft within the limited length of the rotating shaft. have.

In addition, the adhesion of the turn table and the yoke has a problem in that process management of the filled adhesive, such as the amount of adhesive injected between the turn table and the yoke facing each other, the temperature and time at which the adhesive is cured, and the like is difficult.

That is, when the amount of adhesive injected between the turntable and the yoke is large in the process control of the adhesive, the adhesive flows out of the turntable and the yoke, and the adhesive flows out with the moisture in the air to generate a whitening phenomenon and spin the spindle. Deteriorates the appearance quality of the motor.

In addition, when the amount of the adhesive injected between the turn table and the yoke is small, the bonding force between the turn table and the yoke is lowered.

If the adhesive injected between the turn table and the yoke is not fully cured, the disks placed on the turn table are contaminated.

The present invention provides a spindle motor which improves the coupling force and productivity of the parts by increasing the contact area between the parts such as the yoke and the careful unit and the rotation axis within the limited length of the axis of rotation.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In one embodiment, the spindle motor comprises a rotating shaft; A bearing assembly including a bearing into which the rotating shaft is inserted and a bearing housing accommodating the bearing; A stator fixed around the bearing housing and including a core and a coil wound around the core; A rotor including a yoke coupled to the rotating shaft and a magnet disposed on an inner side of the yoke facing the core; And a turn table coupled to the yacht disposed on the upper surface of the yoke, wherein the yoke includes a first coupling part, and the turn table has a second coupling part coupled to the first coupling part.

According to the spindle motor according to the present invention, the yoke and the turn table are mechanically coupled to each other, thereby improving the bonding force between the yoke and the turn table, reducing assembly defects, and improving product productivity and appearance quality.

1 is a cross-sectional view showing a spindle motor according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion 'A' shown in FIG. 1.
3 is a plan view illustrating the yoke of FIG. 1.
4 is a cross-sectional view taken along the line II ′ of FIG. 3.
5 is a plan view illustrating the turn table of FIG. 1.
FIG. 6 is a cross-sectional view taken along the line II-II 'of FIG. 5.
7 is a sectional view showing a spindle motor according to another embodiment of the present invention.

Hereinafter, exemplary 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. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

1 is a cross-sectional view showing a spindle motor according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion 'A' shown in FIG. 1. 3 is a plan view illustrating the yoke of FIG. 1. 4 is a cross-sectional view taken along the line II ′ of FIG. 3. 5 is a plan view illustrating the turn table of FIG. 1. FIG. 6 is a cross-sectional view taken along the line II-II 'of FIG. 5.

1 to 6, the spindle motor 100 includes a rotating shaft 10, a bearing assembly 20, a stator 30, a rotor 40, and a turn table 70. In addition, the spindle motor 100 may further include a base plate 50, a circuit board 60, and a guard unit 80.

Referring to FIG. 1, the bearing assembly 20 includes a bearing 21 and a bearing housing 24.

The bearing 21 has a rotation shaft hole in which the rotation shaft 10 is inserted and supports the rotation shaft 10. The bearing 21 may comprise, for example, an oil impregnated sintered bearing.

The bearing housing 24 houses the bearing 21.

The bearing housing 24 includes, for example, a bottom plate 22 and a side plate 23. The side plate 23 extends from the edge of the bottom plate 22 and thereby the bearing housing 24 is formed in a cylindrical shape with an upper surface opened.

1 to 4, stator 30 is fixed around the bearing housing, and stator 30 includes a core 32 and a coil 34.

The core 32 has a through hole inserted into an outer circumferential surface of the side plate 23 of the bearing housing 24 at a central portion thereof, and the core 32 is formed by overlapping a plurality of core pieces having core portions protruding radially from the outside. The outer circumferential surface of the side plate 23 of the bearing housing 24 is inserted into the opening of the core 32 formed by the through holes formed in the respective core pieces. The coil 34 is wound around the core portion.

The rotary shaft 10 is inserted into the rotary shaft hole of the bearing 21 of the bearing assembly 20, the rotary shaft 10 is rotatably supported by the bearing 21.

1, 2-4, the rotor 40 includes a yoke 42 and a magnet 48.

The yoke 42 is formed in a cylindrical shape with an open lower portion by processing a metal plate or a synthetic resin. The yoke burring portion 42a and the first coupling portion 46 are formed on the upper plate 44 of the yoke 42 facing the turn table 70 to be described later.

The yoke burring portion 42a is formed in the direction toward the bearing 21 from the center of the upper plate 44 of the yoke 42, and the yoke burring portion 42a is coupled to the outer surface of the rotation shaft 10 by press-fitting. As a result, the yoke 42 is rotated together with the rotation shaft 10.

As shown in FIG. 3, a plurality of first coupling parts 46 may be formed outside the yoke burring portion 42a of the upper plate 44 of the yoke 42, and the plurality of first coupling parts 46 may be formed. The circular arrangement is based on the center of the top plate 44 of the yoke 42.

The first coupling portion 46 includes a burring portion 46a and a cock portion 46b. As shown in FIG. 4, the burring portion 46a has a pipe shape with a through hole formed at the center thereof, and the burring portion 46a is opposed to the yoke burring portion 42a at the top plate 44 of the yoke 42. , Protrudes in the direction in which the ten tables 70 are arranged.

Referring to FIG. 2 again, the cock portion 46b is formed at an end portion of the burring portion 46a exposed to the outside of the turn table 70, and the diameter of the cock portion 46b is larger than the diameter of the burring portion 46a. It is largely formed to prevent the turn table 70 from being separated from the yoke 42.

Although not shown, the coke portion 46b is, for example, a through hole of the burring portion 46a on the lower surface of the cock forming portion facing the burring portion 46a and the coke forming portion larger than the burring portion 46a. An insertion pin is inserted into which is formed by the formed punch.

Referring again to FIG. 1, the magnet 48 is disposed on the inner side of the yoke 42 side plate that is bent from the top plate 44 of the yoke 42 to face the core 32, and the magnet 48 is the core 48. It is disposed opposite to (32).

1, 5 and 6, the turn table 70 serves to record data or to support the optical disk on which the data is recorded, the turn table 70 is a yoke coupled to the rotating shaft 10 It is disposed on the upper surface 44 of the 42, the turn table 70 is coupled to the yoke 42. The turn table 70 may be formed by processing a metal plate or by injecting a synthetic resin.

The turn table 70 has an opening 72 having a size larger than the diameter of the yoke burring portion 42a at the center thereof, and an outer side of the opening 72 with the first stepped portion 74 and the second stepped portion ( 78) is formed.

The first step portion 74 is formed outside the opening 72 and is in contact with the upper surface 44 of the yoke 42. As shown in FIG. 5, a plurality of second coupling parts 76 are circularly arranged in the first stepped part 74 so that the first coupling parts 46 are fitted.

The second coupling portion 76 is a through hole into which the burring portion 46a of the first coupling portion 46 is fitted, and the diameter of the through hole is smaller than the size of the cock portion 46b of the first coupling portion 46. The turn table 70 coupled to the yoke 42 prevents external impact or separation when the spindle motor 100 is driven.

When the burring portion 46a of the first coupling portion 46 formed in the yoke 42 passes through the through hole formed in the turn table 70 and is fitted into the second coupling portion 76, the end portion of the burring portion 46a is formed. Is exposed to the outside of the turn table 70. Subsequently, by pressing the exposed burring portion 46a using the above-described punch, a coke portion 46b having a larger size than the diameter of the through hole is formed, and thus the turn table 70 is formed on the upper surface of the yoke 42. It is firmly combined.

In addition, when the yoke 42 and the turn table 70 are coupled by using the first coupling part 46 and the second coupling part 76, the yoke 42 and the turn table 70 may be fixed. Process defects can be reduced, and product productivity and appearance quality are also improved.

The second stepped portion 78 is formed outside the first stepped portion 74, and the second stepped portion 78 is directed along the outer edge of the first stepped portion 74 in the direction of the careful unit 80 to be described later. Protruding to form a height of the second step portion 78 is higher than the height of the first step portion (74).

Referring back to FIG. 1, the base plate 50 is press-fitted into the side plate 23 of the bearing housing 24 to which the core 32 of the stator 30 is coupled, and the bearing housing 24 to the base plate 50. Burring portion 52 for press-fitting into the side plate 23 of the () is formed.

The circuit board 60 is disposed on the base plate 50, and the circuit board 60 is electrically connected to the coil 34 of the stator 30.

The guard unit 80 is coupled to the rotary shaft 10, and the guard unit 80 is disposed on top of the turntable 70 coupled to the rotary shaft 10, wherein the guard unit 80 fixes and optically mounts the optical disk. It serves to fix the center of rotation of the disk to the center of rotation of the axis of rotation.

In an embodiment of the present invention, when the yoke burring portion 42a of the yoke 42 press-fitted to the rotation shaft 10 is formed in the direction toward the bearing 21, and the turntable 70 is coupled to the yoke 42 only. In the limited length of the rotating shaft 10, the area in contact with the rotating shaft 10 between the guard unit 80 and the top plate 44 of the yoke 42 is increased to improve the coupling force.

7 is a cross-sectional view illustrating a spindle motor according to another exemplary embodiment of the present invention. The spindle motor according to another exemplary embodiment of the present invention includes the spindle motor described above with reference to FIGS. 1 to 6 except for the yoke burring portion of the yoke. Have substantially the same configuration. Therefore, redundant description of the same configuration will be omitted, and the same names and the same reference numerals will be given to the same configurations.

Referring to FIG. 7, the yoke 42 is formed by processing a metal plate in a cylindrical shape with a lower opening. The yoke burring portion 42a and the first coupling portion 46 are formed on the upper plate 44 of the yoke 42 facing the turn table 70 to be described later.

The yoke burring portion 42a is formed at the center of the upper plate 44 of the yoke 42 in the direction of the careful unit 80, and the yoke burring portion 42a is coupled to the outer surface of the rotation shaft 10 by press-fitting. As a result, the yoke 42 is rotated together with the rotation shaft 10.

Since the first coupling part 46 is the same as the first coupling part of the exemplary embodiment described with reference to FIGS. 1 to 6, a detailed description thereof will be omitted.

In another embodiment of the present invention, when the yoke burring portion 42a of the yoke 42 press-fitted to the rotation shaft 10 is formed in the direction in which the careful unit 80 faces, the length of the yoke burring portion 42a is lengthened. Since the contact area between the rotating shaft 10 and the yoke 42 is increased, the coupling force of the rotor 40 is improved. This is because the turntable 70 is coupled to the yoke 42 only by the first coupling portion 46 and the second coupling portion 76 formed on the yoke 42 and the turn table 70, so that the careful unit 80 and the yoke are combined. This is because the coupling space of the rotation shaft 10 can be sufficiently secured between the upper plates 44 of the 42.

As described in detail above, the first coupling portion is formed in the yoke, and the second coupling portion coupled to the first coupling portion is formed on the turn table disposed on the yoke, and the turn table is coupled to the yoke to restrict the rotation axis. There is an effect of increasing the bonding area between the products by increasing the contact area of the parts coupled to the rotational axis including the yoke and the careful unit within the length.

In addition, when the yoke and the turn table are coupled by the first coupling part and the second coupling part, process defects generated when the yoke and the turn table are fixed may be reduced, and the productivity and appearance quality of the product may be improved.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

100 ... spindle motor 10 ... spindle
20 ... Bearing assembly 30 ... Stator
40.Rotator 46 ... First coupling part
50 ... base plate 60 ... circuit board
70 ... turn table 76 ... second coupling part
80 ... caution unit

Claims

A rotating shaft;
A bearing assembly including a bearing into which the rotating shaft is inserted and a bearing housing accommodating the bearing;
A stator fixed around the bearing housing and including a core and a coil wound around the core;
A rotor including a yoke coupled to the rotating shaft and a magnet disposed on an inner side of the yoke facing the core; And
A turn table disposed on the yoke and coupled to the yoke,
The yoke is formed with a first coupling portion, the turn table is a spindle motor having a second coupling portion coupled to the first coupling portion.

The method of claim 1,
The second coupling part includes a through hole, and the first coupling part includes a burring part passing through the through hole from the yoke and a caulking part which presses and fixes an upper surface of the turn table by extending the burring part.

The method of claim 1,
The first coupling part includes a through hole, and the second coupling part includes a burring part passing through the through hole from the turn table, and a burring part extending from the burring part to press and fix the lower surface of the yoke.

The method of claim 1,
The first coupling unit is a spindle motor in which a plurality of circularly arranged on the yoke.

The method of claim 1,
The yoke has a spindle motor including a yoke burring portion pressed into the rotating shaft in a direction toward the bearing.

The method of claim 1,
The yoke has a spindle motor including a yoke burring portion pressed into the rotation shaft in a direction opposite to the bearing.

The method of claim 1,
The yoke and the turn table are formed by machining a metal plate spindle motor.

The method of claim 1,
The turn table is a spindle motor formed by injection molding a synthetic resin.