KR20130073386A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20130073386A
KR20130073386A KR1020110141207A KR20110141207A KR20130073386A KR 20130073386 A KR20130073386 A KR 20130073386A KR 1020110141207 A KR1020110141207 A KR 1020110141207A KR 20110141207 A KR20110141207 A KR 20110141207A KR 20130073386 A KR20130073386 A KR 20130073386A
Authority
KR
South Korea
Prior art keywords
bearing
bearing housing
rotating shaft
spindle motor
burring
Prior art date
Application number
KR1020110141207A
Other languages
Korean (ko)
Inventor
한청운
김찬석
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110141207A priority Critical patent/KR20130073386A/en
Publication of KR20130073386A publication Critical patent/KR20130073386A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2018—Incorporating means for passive damping of vibration, either in the turntable, motor or mounting
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2036—Motors characterized by fluid-dynamic bearings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1446—Reducing contamination, e.g. by dust, debris
    • G11B33/1473—Reducing contamination, e.g. by dust, debris of/from bearings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

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  • Motor Or Generator Frames (AREA)

Abstract

The spindle motor includes a base plate including a plate-shaped body, a burring portion projecting from the body in a pipe shape, and a press-in portion projecting from an inner circumferential surface of the burring portion; A bearing assembly including a bearing inserted into the burring part and a bearing inserted into the bearing housing and a bearing inserted into the bearing housing; A stator including a core fixed to an outer circumferential surface of the bearing housing and a coil wound around the core; A rotating shaft rotatably disposed on the bearing; And a rotor coupled to the rotary shaft, wherein a gap is formed between the bearing housing corresponding to the press-in portion and the outer circumferential surface of the bearing.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

In recent years, technology development of an optical disk driver (ODD) for reading data recorded on an optical disk or recording data on an optical disk is in progress.

The optical disk driver includes a spindle motor and an optical pickup module to rotate the optical disk at high speed.

The spindle motor for rotating the optical disk at high speed includes a base plate having a rotating shaft, a bearing supporting the rotating shaft, a bearing housing fixing the bearing, a stator coupled to the bearing housing, a rotor fixed to the rotating shaft, and a burring portion pressed into the bearing housing. Include.

In the conventional spindle motor, since the inner diameter shrinkage of the bearing occurs while the bearing housing is pressed into the burring portion of the base plate, a sizing process of expanding the inner diameter of the bearing must be performed.

In addition, the conventional spindle motor has a short length of the bearing for rotatably supporting the rotating shaft, thereby causing eccentricity and vibration of the optical disk.

In addition, in the conventional spindle motor, a large space is formed between the bearing and the rotor so that foreign matter flows between the bearing and the rotating shaft, so that a poor rotation occurs frequently.

In addition, since the bearing of the conventional spindle motor is difficult to distinguish the top and bottom, the bearing may be misinserted when the bearing is coupled to the bearing housing.

The present invention provides a spindle motor that prevents the inner diameter shrinkage of the bearing generated when the bearing housing is pressed into the burring portion of the base plate.

In addition, the present invention provides a spindle motor that increases the contact area between the bearing and the rotating shaft to prevent the occurrence of eccentricity and vibration, to prevent foreign matter from flowing between the bearing and the rotating shaft, and to prevent the misinsertion of the bearing.

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 may include a base plate including a plate-shaped body, a burring portion protruding from the body in a pipe shape, and a press-in portion protruding from an inner circumferential surface of the burring portion; A bearing assembly including a bearing inserted into the burring part and a bearing inserted into the bearing housing and a bearing inserted into the bearing housing; A stator including a core fixed to an outer circumferential surface of the bearing housing and a coil wound around the core; A rotating shaft rotatably disposed on the bearing; And a rotor coupled to the rotary shaft, wherein a gap is formed between the bearing housing corresponding to the press-in portion and the outer circumferential surface of the bearing.

In an embodiment, the spindle motor may include a base plate including a plate-shaped body and a burring portion protruding from the body in a pipe shape, and a press-in portion protruding from an inner circumferential surface of the burring portion; A bearing assembly including a bearing inserted into the burring part and a bearing inserted into the bearing housing and a bearing inserted into the bearing housing; A stator including a core fixed to an outer circumferential surface of the bearing housing and a coil wound around the core; A rotating shaft rotatably disposed on the bearing; And a rotor coupled to the rotating shaft, wherein a gap is formed between the bearing housing corresponding to the press-in portion and the outer circumferential surface of the bearing, and an inner surface height of the bearing into which the rotating shaft is inserted is greater than an outer surface height of the bearing. It is formed high.

According to the spindle motor according to the present invention, to prevent the inner diameter shrinkage of the bearing generated when the bearing housing is pressed into the burring portion of the base plate, to increase the contact area between the bearing and the rotating shaft to prevent the occurrence of eccentricity and vibration, foreign matter between the bearing and the rotating shaft This prevents the inflow and has the effect of preventing the incorrect insertion of the bearing.

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' of FIG. 1.
3 is a cross-sectional view showing a spindle motor according to another embodiment of the present invention.
4 is an enlarged view of a portion 'B' of FIG. 2.

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. 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' of FIG. 1.

1 and 2, the spindle motor 600 includes a base plate 100, a bearing assembly 200, a stator 300, a rotation shaft 400, and a rotor 500.

The base plate 100 includes a body 110, a burring portion 120, and a press-in portion 130.

The body 110 may be formed in a plate shape, for example, and a circuit board 140 may be disposed on an upper surface of the body 110 to be electrically connected to the stator 300 to be described later.

Burring portion 120 may be formed on the body 110 of the base plate 100 by a burring process. For example, the burring part 120 may be formed in a direction from the lower surface of the body 110 toward the upper surface, and the burring part 120 may be formed in a pipe shape.

In one embodiment of the present invention, the inner diameter of the burring portion 120 is formed to a diameter larger than the diameter of the outer peripheral surface of the bearing housing of the bearing assembly 200 to be described later, so that the bearing housing of the bearing assembly 200 is a burring portion ( 120).

The indentation unit 130 is formed on the inner surface of the burring unit 120, the indentation unit 130 may be formed by bending the end of the burring unit 120 inward. Alternatively, the press-in portion 130 may protrude from the inner surface of the burring portion 120 toward the bearing housing of the bearing assembly 200.

For example, the press-fit unit 130 may be formed in a ring shape along an inner side surface of the burring unit 120. Alternatively, a plurality of press-fit portions 130 may be formed intermittently.

The indentation unit 130 is directly press-fitted to the outer surface of the bearing housing of the bearing assembly 200.

The bearing assembly 200 includes a bearing 210 and a bearing housing 220.

The bearing housing 220 may be formed by, for example, forming a metal plate into a cup shape by press working.

A flange portion 222 is formed at an upper end of the side wall 221 of the bearing housing 220 to be pressed outward and press the core of the stator 300 to be described later.

On the outer circumferential surface of the side wall 221 of the bearing housing 220, a press-fit part 130 formed in the burring part 120 of the base plate 100 is press-fitted.

The bearing 210 is inserted into the bearing housing 220. The bearing 210 is formed in a cylindrical shape, and the bearing 210 may include an oil-impregnated oil-impregnated sintered bearing.

The bearing 210 is coupled to the bearing housing 220 in an interference fit so that the bearing 210 is not rotated in the bearing housing 220.

On the other hand, when the side wall 221 of the bearing housing 220 is pressed into the press-in portion 130 of the base plate 100, the side wall 221 of the bearing housing 220 is the pressure toward the inside of the bearing housing 220 Will receive. Therefore, the pressure acts as a force for compressing the bearing 210, and the inner diameter of the bearing 210 is contracted by the pressure.

In one embodiment of the present invention, the bearing housing 220 and the bearing housing 220 corresponding to the indentation unit 130 in order to prevent the contraction of the inner diameter of the bearing 210 is generated while the bearing housing 220 is indented by the indentation unit 130 And a gap is formed between the bearing 210 and the bearing 210.

The gap formed between the indentation unit 130 and the corresponding bearing housing 220 and the bearing 210 accommodates a shape deformation generated while the bearing housing 220 is press-fitted into the indentation unit 130 to receive the inner diameter of the bearing 210. Prevent shrinkage from occurring

In one embodiment of the present invention, the gap formed between the indentation unit 130 and the corresponding bearing housing 220 and the bearing 210 corresponds to, for example, the indentation unit 130 of the outer circumferential surface of the bearing 210. It is implemented by forming the escape portion 212 in the position.

2, the height H1 of the escape portion 212 of the bearing 210 is 5% to 40% of the total height H2 of the bearing 210. When the height H1 of the escape portion 212 is 5% or less of the total height H2 of the bearing 210, the bearing 210 is compressed by the press-fitting portion 130 to generate an inner diameter contraction of the bearing 210. Can be.

On the other hand, when the height H1 of the escape portion 212 is 40% or more of the total height H2 of the bearing 210, the total volume of the bearing 210 may be reduced and the bearing 210 may have a bearing housing 220. ) Can flow inside.

Referring to FIG. 2, the width D1 of the bearing 210 in which the escape portion 212 is formed is preferably 60% to 95% of the width D2 of the bearing 210 in which the escape portion 212 is not formed. Do.

The bearing 210 and the bearing housing 220 when the width D1 of the bearing 210 in which the hide 212 is formed is 60% or less of the width D2 of the bearing 210 in which the hide 212 is not formed. The gap between them is so wide that the volume of the bearing 210 is reduced and the bearing 210 can flow in the bearing housing 220. On the other hand, when the width D1 of the bearing 210 in which the escape part 212 is formed is 95% or more of the width D2 of the bearing 210 in which the escape part 212 is not formed, the bearing housing 220 and the escape part The gap between 212 is reduced so that the inner diameter of the bearing 210 can be reduced by the bearing housing 220.

Although in one embodiment of the present invention, the bearing housing 220 is compressed by the press-in portion 130 formed in the burring portion 120 of the base plate 100 to prevent the inner diameter of the bearing 210 is reduced Although the drawing portion 212 is formed and illustrated on the outer circumferential surface of the bearing 210 facing the inner circumferential surface of the housing 220, the escape portion is different from the bearing housing 220 facing the outer circumferential surface of the bearing 210. It may be formed on the inner circumferential surface of the.

Referring back to FIG. 1, the stator 300 includes a core 310 and a coil 320.

The core 310 is inserted into the outer circumferential surface of the bearing housing 220, and the core 310 is formed by stacking a plurality of core pieces having a thin thickness. In the center of the core 310 is formed a through hole into which the side wall 221 of the bearing housing 220 is inserted.

The lower surface of the core 310 facing the upper surface of the body 110 of the base plate 100 is in contact with the upper end of the burring portion 120, the upper surface of the core 310 which is the surface opposite to the lower surface of the core 310 The flange 222 is formed on the upper end of the bearing housing 220.

The coil 320 is wound around the core 310, and a magnetic field is generated from the coil 320 by the current applied to the coil 320. The coil 320 is electrically connected to the circuit board 140 disposed on the upper surface of the base plate 100.

The rotating shaft 400 is inserted into the rotating shaft hole of the bearing 210 so as to be rotatable, and an end of the rotating shaft 400 facing the bottom plate of the bearing housing 220 is in contact with the thrust bearing 230.

The rotor 500 includes a yoke 510 and a magnet 520.

The yoke 510 is formed in a cylindrical shape with a lower opening, and the yoke 510 includes a yoke upper plate 512 and a yoke side plate 516.

The yoke upper plate 512 is formed in a disc shape, and a yoke burring portion 514 is formed at the center of the yoke upper plate 512 to be coupled to the rotation shaft 400.

The yoke side plate 516 extends from the edge of the yoke top plate 512 in the axial direction of the rotation axis 400.

The magnet 520 is disposed on the inner side surface of the yoke side plate 516, and a magnetic field is generated from the magnet 520 to generate a rotational force by working with a magnetic field generated from the coil 320 of the stator 300.

On the upper surface of the yoke top plate 512 is disposed a careful unit 550 is coupled to the yoke burring portion 514 coupled to the rotary shaft 400.

3 is a cross-sectional view showing a spindle motor according to another embodiment of the present invention. 4 is an enlarged view of a portion 'B' of FIG. 2. The spindle motor shown in FIGS. 3 and 4 has substantially the same configuration as the spindle motor shown in FIGS. 1 and 2 above except for bearings. 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.

3 and 4, the spindle motor 600 includes a base plate 100, a bearing assembly 200, a stator 300, a rotation shaft 400, and a rotor 500.

The bearing assembly 200 includes a bearing 210 and a bearing housing 220.

The bearing 210 is formed in a cylindrical shape, the bearing 210 is formed with a rotating shaft hole for rotatably supporting the rotating shaft 400.

An extension portion 216 is formed on the upper surface 210a of the bearing 210 to prevent the eccentricity and vibration of the optical disk rotated by the rotation shaft 400 by increasing the support area of the rotation shaft 400.

The expansion part 216 may be formed in a shape in which the area decreases from the upper surface 210a of the bearing 210 toward the upper part, and the expansion part 216 is integrally formed with the bearing 210.

In one embodiment of the present invention, the height H3 of the extension 216 is preferably 5% to 25% of the total height H4 of the bearing 210.

In one embodiment of the present invention, the upper end of the bearing 210 by the expansion portion 216 extending upward from the upper surface 210a of the bearing 210, the yoke top plate of the yoke 510 (rotor 500) ( It is disposed adjacent to the 512 and it can be prevented from entering the foreign matter between the inner surface of the bearing 210 and the outer peripheral surface of the rotating shaft 400.

In addition, by forming the extension 216 from the upper surface 210a of the bearing 210, the bearing 210 is formed in a shape different from that of the upper surface 210a of the bearing 210 and the lower surface of the bearing 210. 210 may be prevented from being incorrectly inserted into the bearing housing 220 in a different direction.

As described in detail above, it prevents contraction of the inner diameter of the bearing generated when the bearing housing is pressed into the burring part of the base plate, and increases the contact area between the bearing and the rotating shaft, thereby preventing the occurrence of eccentricity and vibration, and foreign matter between the bearing and the rotating shaft. It prevents the inflow and has the effect of preventing the wrong insertion of the bearing.

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.

600 ... spindle motor 100 ... base plate
200 ... bearing assembly 300 ... stator
400 ... rotation shaft 500 ... rotator
216.Extension

Claims (13)

A base plate including a plate-shaped body, a burring portion protruding from the body in a pipe shape, and a press-in portion protruding from an inner circumferential surface of the burring portion;
A bearing assembly including a bearing inserted into the burring part and a bearing inserted into the bearing housing and a bearing inserted into the bearing housing;
A stator including a core fixed to an outer circumferential surface of the bearing housing and a coil wound around the core;
A rotating shaft rotatably disposed on the bearing; And
Includes a rotor coupled to the rotating shaft,
The spindle motor has a gap formed between the bearing housing corresponding to the press-in portion and the outer peripheral surface of the bearing. The method of claim 1,
The outer peripheral surface of the bearing corresponding to the press-in portion and the spindle motor for forming a gap forming the gap. The method of claim 2,
The height of the escape portion formed in the bearing is 5% to 40% of the total height of the bearing. The method of claim 2,
And a width of the bearing having the escape portion is 60% to 95% of the width of the bearing without the escape portion. The method of claim 1,
And an inner surface of the bearing housing corresponding to the indentation portion, wherein the escape portion is formed to form the gap. The method of claim 5,
Spindle motor formed on the upper surface of the bearing extending portion for increasing the support area of the inner surface and the rotating shaft of the bearing. The method according to claim 6,
The height of the extension is a spindle motor of 5% to 25% of the total height of the bearing. The method according to claim 6,
The width of the extension part is between 20% and 70% of the width of the bearing. The method according to claim 6,
And the planar area of the extension portion decreases from the top to the top of the bearing. A base plate including a plate-shaped body and a burring portion protruding from the body in a pipe shape and a press-in portion protruding from an inner circumferential surface of the burring portion;
A bearing assembly including a bearing inserted into the burring part and a bearing inserted into the bearing housing and a bearing inserted into the bearing housing;
A stator including a core fixed to an outer circumferential surface of the bearing housing and a coil wound around the core;
A rotating shaft rotatably disposed on the bearing; And
Includes a rotor coupled to the rotating shaft,
And a gap is formed between the bearing housing corresponding to the press-in portion and the outer circumferential surface of the bearing, and an inner surface height of the bearing into which the rotating shaft is inserted is higher than an outer surface height of the bearing. The method of claim 10,
Spindle motor formed on the upper surface of the bearing extending portion for increasing the support area of the inner surface and the rotating shaft of the bearing. The method of claim 10,
The outer peripheral surface of the bearing corresponding to the press-in portion and the spindle motor for forming a gap forming the gap. The method of claim 10,
And an inner surface of the bearing housing corresponding to the indentation portion, wherein the escape portion is formed to form the gap.
KR1020110141207A 2011-12-23 2011-12-23 Spindle motor KR20130073386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110141207A KR20130073386A (en) 2011-12-23 2011-12-23 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110141207A KR20130073386A (en) 2011-12-23 2011-12-23 Spindle motor

Publications (1)

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KR20130073386A true KR20130073386A (en) 2013-07-03

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Family Applications (1)

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KR1020110141207A KR20130073386A (en) 2011-12-23 2011-12-23 Spindle motor

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