KR20130101845A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20130101845A
KR20130101845A KR1020120022897A KR20120022897A KR20130101845A KR 20130101845 A KR20130101845 A KR 20130101845A KR 1020120022897 A KR1020120022897 A KR 1020120022897A KR 20120022897 A KR20120022897 A KR 20120022897A KR 20130101845 A KR20130101845 A KR 20130101845A
Authority
KR
South Korea
Prior art keywords
sleeve
thrust plate
bush
spindle motor
disc portion
Prior art date
Application number
KR1020120022897A
Other languages
Korean (ko)
Inventor
김주환
Original Assignee
삼성전기주식회사
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 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020120022897A priority Critical patent/KR20130101845A/en
Publication of KR20130101845A publication Critical patent/KR20130101845A/en

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Classifications

    • 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
    • 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
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

Abstract

PURPOSE: A spindle motor is provided to uniformly implement pressure distribution by dispersing stress although the rotating unit rotates in an unbalanced manner. CONSTITUTION: A spindle motor includes a rotating unit and a fixing unit. The rotating unit includes a sleeve (160), a herb (170), and a magnet (190). The fixing unit includes a shaft (110), a bush (120), a thrust plate (150), a base (130), and an armature (140).

Description

[0001] SPINDLE MOTOR [0002]

The present invention relates to a spindle motor.

In general, a spindle motor used as a drive device for a recording disk such as a hard disk has a lubricating fluid such as oil stored between a rotating part and a fixed part when the motor rotates, and a fluid dynamic bearing using the generated dynamic pressure is provided. It is used in various ways.

More specifically, since a spindle motor equipped with a hydrodynamic bearing which maintains the shaft stiffness only by the operating pressure of the lubricant by centrifugal force is based on the winsim force, there is no metal friction and the stability is increased at high rotational speeds to prevent noise and vibration. It is mainly used in high-end optical disk devices and magnetic disk devices because it is less likely to occur and the high-speed rotation of the rotating body is smoother than a motor having a ball bearing.

The patent document described in the following prior art document is a spindle motor having a fluid dynamic pressure bearing. However, the spindle motor according to the prior art, including the prior art document, when unbalanced or external pressure is generated, the stress is concentrated on the coupling portion of the shaft and the thrust plate, the system stability is lowered, and thus an error occurs in the technical implementation of the spindle motor I have a problem.

US 6534890 B

The present invention has been made to solve the above problems, an aspect of the present invention is composed of a fixed protrusion and a disc portion opposed to the sleeve is inserted into the thrust plate, the rigidity and stability by the coupling by the fixed protrusion It is possible to form a thinner disc part, and the span length of the bearing is longer than that of the conventional thrust plate by the thickness of the disc part, which is shorter than that of the conventional spindle motor, and the stress is dispersed even when the rotating part is unbalanced. It is to provide a spindle motor that can be implemented uniformly.

Spindle motor according to a first embodiment of the present invention is a rotating part including a sleeve, a hub coupled to the sleeve, a magnet coupled to the inner peripheral surface of the hub, a shaft for rotatably supporting the sleeve, the shaft is fixedly coupled A fixed part including a bush, a thrust plate opposed to the sleeve and mounted to the sleeve, a base into which the bush is inserted and mounted to face the magnet, and an armature coupled to an outer circumference of the base. And a hydraulic fluid bearing part is formed between the rotating part and the fixed part by injecting oil, which is a working fluid, and the thrust plate includes a fixed protrusion part inserted into and fixed to the bush, and a disc part facing the lower surface of the sleeve.

In addition, the bush of the spindle motor according to the first embodiment of the present invention is formed with a groove portion into which the fixed protrusion of the thrust plate is inserted, and a thrust plate seating portion on which the disc portion of the thrust plate is seated.

In addition, the disc portion of the thrust plate of the spindle motor according to the first embodiment of the present invention corresponds to the thrust plate seating portion of the bush and is seated on the bush so as to have a small distance from the sleeve.

In addition, a thrust dynamic pressure generating groove may be selectively formed on one side of the disc portion of the thrust plate and the sleeve facing the disc portion of the spindle motor according to the first embodiment of the present invention.

The spindle motor according to the second embodiment of the present invention is opposed to a sleeve including a sleeve, a hub coupled to the sleeve, a magnet coupled to an inner circumferential surface of the hub, a shaft for rotatably supporting the sleeve, and the sleeve. A thrust plate mounted on the sleeve, the shaft being inserted and coupled, and having a base including an armature mounted so as to face the magnet, and an armature coupled to an outer circumference of the base, the oil being a working fluid injected therein. Thus, a hydrodynamic bearing part is formed between the rotating part and the fixed part, and the thrust plate includes a fixed protrusion part inserted into and fixed to the base, and a disc part facing the lower surface of the sleeve.

In addition, the base of the spindle motor according to the second embodiment of the present invention is formed with a groove portion into which the fixed protrusion of the thrust plate is inserted, and a thrust plate seating portion on which the disc portion of the thrust plate is seated.

In addition, the disc portion of the thrust plate of the spindle motor according to the second embodiment of the present invention corresponds to the thrust plate seating portion of the bush and is seated on the bush so as to have a small distance from the sleeve.

In addition, a thrust dynamic pressure generating groove may be selectively formed on one side of the disc portion of the thrust plate and the sleeve facing the disc portion of the spindle motor according to the second embodiment of the present invention.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, according to the present invention, the spindle motor according to the present invention is composed of a fixed protrusion portion and the disc portion opposed to the sleeve, the thrust plate is inserted into the bush, the rigidity and stability is improved by the combination by the fixed protrusion, As the disc part can be made thin, the span length of the bearing is longer than that of the conventional thrust plate by the thickness of the disc part, which is shorter than that of the conventional spindle motor, and the stress is distributed evenly when the rotating part is unbalanced, so that the pressure distribution is uniformly realized. Can get a spindle motor.

1 is a cross-sectional view schematically showing a spindle motor according to a first embodiment of the present invention.
2 is a partial exploded cross-sectional view schematically showing the bush and thrust plate of the spindle motor shown in FIG.
3 is a sectional view schematically showing a spindle motor according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It is also to be understood that the terms "first,"" second, "" one side,"" other, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing a spindle motor according to an embodiment of the present invention, Figure 2 is a partial exploded cross-sectional view schematically showing the bush and the thrust plate of the spindle motor shown in FIG.

As shown, the spindle motor 100 includes a fixing part including a shaft 110, a bush 120, a base 130, an armature 140, and a thrust plate 150, a sleeve 160, and a hub. It consists of a fixing part including a 170, a disk fixing member 180 and a magnet 190, oil is injected into the working fluid is formed between the rotating portion and the fixed hydrodynamic bearing portion.

More specifically, in the fixing portion, the shaft 110 is inserted into the sleeve 160 of the rotating portion, and supports the sleeve 160 to be rotatable.

In addition, the bush 120 has an inner diameter corresponding to the outer diameter of the shaft 110 so that the shaft 110 is fixedly coupled. In addition, the bush 120 is formed with a groove portion 121 into which the thrust plate is inserted and a thrust plate seating portion 122 on which the thrust plate is seated.

In addition, the thrust plate 150 is composed of a fixed protrusion 151 and the disc portion 152, as shown in more detail in FIG.

The fixed protrusion 151 of the thrust plate is to be inserted into the bush 120 and is formed to correspond to the groove 121 of the bush 120. In addition, the disc portion 152 is seated on the bush 120 to have a small gap with the sleeve 150.

The disc portion 152 is formed to correspond to the thrust plate seating portion 122 of the bush 120. In addition, a thrust dynamic pressure generating groove (not shown) may be formed in the disc portion 152 on the surface facing the sleeve 160.

In addition, the bush 120 is inserted into and fixed to the inner diameter portion of the base 130. The armature 140 formed of the core 142 and the coil 141 is mounted on the base so as to face the magnet 190 of the rotating unit by press fitting or bonding.

In addition, one surface of the base 130 may be mounted with a pulling plate 131 facing the magnet in the axial direction of the shaft, and the pulling plate 131 may be used to prevent injuries of the rotating part by the attraction force with the magnet. will be.

Next, in the rotating part, the sleeve 160 is supported to be rotatable by the shaft 110. A cover 161 for mounting the upper end of the shaft 110 is mounted on the inner circumferential surface of the upper end of the sleeve.

In addition, a dynamic pressure generating groove (not shown) is selectively formed at upper and lower portions of the inner circumferential surface of the sleeve 160 or upper and lower portions of the outer circumferential surface of the shaft 110 to form the radial dynamic bearing portion.

In addition, the sleeve 160 may face a disc portion of the thrust plate so that a thrust dynamic pressure generating groove may be formed.

In addition, the hub 170 is fixed to the outer circumferential surface of the upper end of the sleeve 160 by pressing or bonding. The hub 170 is a cylindrical portion 171 fixed to the sleeve 160, a disc portion 172 extending radially outward from the cylindrical portion 171, and a radial direction of the disc portion 172. It consists of a side wall portion 173 extending downward in the axial direction of the rotation axis at the outer end.

In addition, the magnet 190 having an annular shape is mounted on the inner circumferential surface of the side wall portion 173 so as to face the armature 140 including the core 142 and the coil 141.

In addition, the disk fixing member 180 is for supporting the upper portion of the disk mounted on the hub 170, the support member 181 for supporting the upper portion of the disk and the support member 182 fixed to the hub It includes a fixing member 182 to make. To this end, the support member and the hub may be formed with a fixing member coupling portion corresponding to the fixing member, respectively, the fixing member and the fixing member coupling portion may be implemented in a screw coupling method.

In this way, the spindle motor according to the first embodiment of the present invention is composed of a fixed protrusion portion and the disc portion opposed to the sleeve, the thrust plate is inserted into the bush, the rigidity and stability is improved by the coupling by the fixed protrusion, As the disc part can be made thin, the span length of the bearing is longer than that of the conventional thrust plate by the thickness of the disc part, which is shorter than that of the conventional spindle motor, and the stress is distributed evenly when the rotating part is unbalanced, so that the pressure distribution is uniformly realized. Can be.

3 is a cross-sectional view schematically showing a spindle motor according to a second embodiment of the present invention. The spindle motor 200 according to the second embodiment of the present invention is integrally formed with the bush and the base as compared with the spindle motor according to the first embodiment.

More specifically, the spindle motor 200 includes a fixing part including a shaft 210, a base 220, an armature 230, and a thrust plate 240, a sleeve 160, a hub 260, and a disk fixing part. It consists of a fixed part including a member 270 and a magnet 280, the oil is a working fluid is injected to form a hydrodynamic bearing between the rotating part and the fixed part.

In addition, the rotation part is the same as the spindle motor according to the first embodiment shown in Figure 1 technical description, the description of the technical configuration, shape and organic coupling is omitted.

On the other hand, in the fixing portion, the shaft 210 is inserted into the sleeve 250 of the rotating portion, and supports the sleeve 250 to be rotatable.

In addition, the base 220 has an inner diameter corresponding to the outer diameter of the shaft 210 so that the shaft 210 can be fixedly coupled. In addition, the base 220 has a groove portion into which the fixed protrusion of the thrust plate is inserted, and a thrust plate seating portion on which the thrust plate is seated. In addition, the groove portion and the thrust plate seating portion have the same shape as the groove portion 121 and the seating portion 122 of the spindle motor according to the first embodiment shown in FIG. 2.

In addition, the thrust plate 240 is composed of a fixed protrusion and a disc portion having the same shape as the thrust plate 150 of the spindle motor according to the first embodiment.

The disc portion is formed to correspond to the thrust plate seating portion of the base 220. In addition, a thrust dynamic pressure generating groove (not shown) may be formed in a surface of the disc portion opposite to the sleeve 250.

The cylindrical portion of the thrust plate has an inner diameter corresponding to the outer diameter of the shaft, and the disc portion of the thrust plate is seated on the base to have a small distance from the sleeve.

In addition, an armature 230 composed of a core 232 and a coil 231 is mounted to the base so as to face the magnet 280 of the rotating part by press fitting or bonding.

In addition, one surface of the base 220 may be mounted with a pulling plate 221 opposite to the magnet 280 in the axial direction of the shaft, and the pulling plate 221 may lift the rotating part by the attraction force with the magnet. It is to prevent.

In this way, the spindle motor according to the second embodiment of the present invention is composed of a fixed protrusion portion and the disc portion opposed to the sleeve, the thrust plate is inserted into the bush, the rigidity and stability is improved by the coupling by the fixed protrusion, As the disc part can be made thin, the span length of the bearing is longer than that of the conventional thrust plate by the thickness of the disc part, which is shorter than that of the conventional spindle motor, and the stress is distributed evenly when the rotating part is unbalanced, so that the pressure distribution is uniformly realized. Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: spindle motor 110: shaft
120: bush 121: groove
122: mounting portion 130: base
140: armature 141: coil
142 core 150 thrust plate
151: fixed protrusion 152: disc portion
160: sleeve 161: cover
170: hub 171: cylindrical portion
1 72: disc portion 173: side wall portion
180 disc fixing member 181 support member
182: fixing member
200: spindle motor 210: shaft
220: base 230: armature
231 coil 232 core
240: thrust plate 250: sleeve
251 cover 260 hub
261: cylindrical portion 262: disc portion
263: side wall portion 270: disk fixing member
271: support member 272: fixed member

Claims (8)

A rotating part including a sleeve, a hub coupled to the sleeve, and a magnet coupled to an inner circumferential surface of the hub; And
A shaft for rotatably supporting the sleeve, a bush to which the shaft is fixedly coupled, a thrust plate opposite to the sleeve and mounted to the sleeve, a base into which the bush is inserted and mounted to face the magnet; It includes a fixed part including an armature coupled to the outer peripheral portion of the base, the oil is a working fluid is injected to form a hydrodynamic bearing between the rotating part and the fixed part,
The thrust plate is a spindle motor consisting of a fixed protrusion which is fixed to the bush and a disc portion facing the lower surface of the sleeve.
The method according to claim 1,
The bush
And a groove portion into which the fixed protrusion of the thrust plate is inserted, and a thrust plate seating portion on which the disc portion of the thrust plate is seated.
The method according to claim 1,
And a disc portion of the thrust plate corresponding to the thrust plate seating portion of the bush and seated on the bush to have a small distance from the sleeve.
The method according to claim 3,
And a thrust dynamic pressure generating groove is selectively formed on one side of the disc portion of the thrust plate and the sleeve facing the disc portion.
A rotating part including a sleeve, a hub coupled to the sleeve, and a magnet coupled to an inner circumferential surface of the hub; And
A shaft for rotatably supporting the sleeve, a thrust plate opposite the sleeve and mounted to the sleeve, a base into which the shaft is inserted and mounted with an armature mounted opposite the magnet, and an armature coupled to an outer circumference of the base Included as a fixed part comprising a, is injected into the working fluid oil is formed between the rotating portion and the fixed hydrodynamic bearing,
The thrust plate is a spindle motor comprising a fixed protrusion that is inserted into the base fixed to, and a disc portion facing the lower surface of the sleeve.
The method according to claim 5,
The base
And a groove portion into which the fixed protrusion of the thrust plate is inserted, and a thrust plate seating portion on which the disc portion of the thrust plate is seated.
The method according to claim 5,
And a disc portion of the thrust plate corresponding to the thrust plate seating portion of the bush and seated on the bush to have a small distance from the sleeve.
The method of claim 7,
And a thrust dynamic pressure generating groove is selectively formed on one side of the disc portion of the thrust plate and the sleeve facing the disc portion.
KR1020120022897A 2012-03-06 2012-03-06 Spindle motor KR20130101845A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120022897A KR20130101845A (en) 2012-03-06 2012-03-06 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120022897A KR20130101845A (en) 2012-03-06 2012-03-06 Spindle motor

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KR20130101845A true KR20130101845A (en) 2013-09-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160009867A (en) 2014-07-17 2016-01-27 삼성전기주식회사 Spindle motor and driving device of recording disk having the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160009867A (en) 2014-07-17 2016-01-27 삼성전기주식회사 Spindle motor and driving device of recording disk having the same

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