KR20130039236A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20130039236A
KR20130039236A KR1020110103762A KR20110103762A KR20130039236A KR 20130039236 A KR20130039236 A KR 20130039236A KR 1020110103762 A KR1020110103762 A KR 1020110103762A KR 20110103762 A KR20110103762 A KR 20110103762A KR 20130039236 A KR20130039236 A KR 20130039236A
Authority
KR
South Korea
Prior art keywords
sleeve
rotating shaft
spindle motor
coating layer
axial direction
Prior art date
Application number
KR1020110103762A
Other languages
Korean (ko)
Inventor
오명근
김용식
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 KR1020110103762A priority Critical patent/KR20130039236A/en
Publication of KR20130039236A publication Critical patent/KR20130039236A/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
    • 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
    • G11B33/148—Reducing friction, adhesion, drag
    • 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
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • 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

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  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

An armature comprising a rotating part including a rotating shaft, a hub and a magnet, a sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, and an arm opposing and fixedly coupled to the base, the core and a coil A spindle motor comprising a fixed part including a hydraulic fluid-filled bearing part between the rotating part and the fixed part, wherein the sleeve and the rotating shaft are in contact with each other to prevent axial surface contact friction between the sleeve and the rotating shaft. The coating layer is selectively formed on one side opposite.

Description

Spindle Motor

The present invention relates to a spindle motor.

In general, a spindle motor used as a driving 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 at the time of rotation of the motor. It is used in various ways.

More specifically, a spindle motor equipped with a fluid dynamic pressure bearing that maintains axial rigidity of the shaft only by the moving pressure of the lubricating oil by centrifugal force is based on the thrust force. Therefore, there is no metal friction, And it is mainly applied to high-end optical disc apparatuses and magnetic disc apparatuses, since the high-speed rotation of the rotating object is smoother than the motor having the ball bearing.

And the spindle motor having a hydrodynamic bearing according to the prior art is damaged by the surface contact friction of the sleeve and the hub during low-speed rotation, and the damage and driving characteristics by the surface contact and friction of the flange and the sleeve of the rotating shaft in case of over-injury of the rotating part There is a problem of degradation.

The present invention has been made in order to solve the above problems, the coating layer is selectively formed on one surface of the sleeve and the rotating shaft to prevent axial surface contact friction of the sleeve and the rotating shaft in case of over-injury of the rotating part, In order to prevent the axial surface contact friction between the hub and the sleeve in the axial direction of the rotation axis during the rotation, the coating layer is formed on one surface facing the sleeve to solve the problems of damage and deterioration of driving characteristics due to surface contact and friction It is to provide a motor.

An armature comprising a rotating part including a rotating shaft, a hub and a magnet, a sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, and an arm opposing and fixedly coupled to the base, the core and a coil A spindle motor comprising a fixed part including a hydraulic fluid-filled bearing part between the rotating part and the fixed part, wherein the sleeve and the rotating shaft are in contact with each other to prevent axial surface contact friction between the sleeve and the rotating shaft. The coating layer is selectively formed on one side opposite.

A flange portion is formed at a lower end of the rotating shaft, and a coating layer is formed on one surface of the flange portion facing the sleeve in the axial direction of the rotating shaft.

In addition, a flange portion is formed at the lower end portion, and a coating layer is formed on one surface of the sleeve facing the flange portion in the axial direction of the rotation shaft.

In addition, the coating layer is made of molybdenum coating or Teflon coating.

In addition, the hub is further formed with a coating layer on one surface facing the sleeve to prevent axial surface contact friction with the sleeve in the axial direction of the rotation axis.

In addition, the hub is a cylindrical portion fixed to the upper end of the rotating shaft, a disk portion extending radially outward from the cylindrical portion, a side wall portion extending downward in the axial direction of the rotation shaft at the radially outer end of the disk portion, Comprising a sealing portion opposed to the outer peripheral surface of the sleeve and extending downward in the axial direction of the rotation axis to form an interface of the oil, a coating layer is formed on one surface of the disc portion opposite to the sleeve.

In addition, the coating layer is made of molybdenum coating.

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, a coating layer is selectively formed on one surface of the sleeve and the rotating shaft facing each other, and a coating layer is formed on the surface opposite to the sleeve to solve the problem of damage due to surface contact and friction and deterioration of driving characteristics. You can get it.

1 is a cross-sectional view schematically showing a spindle motor according to a first embodiment of the present invention.
Figure 2 is a partial cross-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 will be further understood that terms such as " 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, exemplary embodiments of the spindle motor according to 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 the present invention. As shown, the spindle motor 100 is a rotating part including the rotating shaft 110, the hub 120, the magnet 130, the sleeve 140, the base 150, the armature 160, the pulling plate (pulling) plate) 170, the cover 180 is made of a fixed portion, the working fluid is filled with oil is formed between the rotating portion and the fixed hydrodynamic bearing portion.

In addition, a first coating layer C1 is formed to prevent axial surface contact friction between the sleeve and the rotating shaft, and a second coating layer C2 is formed to prevent axial surface contact friction between the hub and the sleeve.

More specifically, in the rotating part, the hub 120 is coupled to the upper end of the rotary shaft 110, the flange portion 111 is formed at the lower end. In addition, the rotating shaft is formed with a first coating layer (C1) on one surface of the flange portion 111 opposite to the sleeve in the axial direction of the rotating shaft. The first coating layer (C1) is to prevent the problem of damage and deterioration of driving characteristics due to the surface contact and friction of the flange 111 and the sleeve in case of over-injury of the rotating part. To this end, the first coating layer (C1) is implemented using molybdenum coating, Teflon coating and the like.

In addition, the hub 120 is a cylindrical portion 121 fixed to the upper end of the rotating shaft 110, a disk portion 122 extending radially outward from the cylindrical portion 121, the radius of the disk portion 122 A side wall portion 123 extending downward in the axial direction of the rotation shaft at the outer end in the direction, and a sealing portion 124 opposed to the outer circumferential surface of the sleeve and extending downward in the axial direction of the rotation shaft to form an interface of oil are formed.

In addition, a second coating layer C2 is formed on one surface of the disc portion 122 of the hub 120 opposite to the sleeve 140. As described above, the second coating layer C2 is formed to prevent axial surface contact friction between the hub 120 and the sleeve 140 during the low speed rotation of the rotating unit. In addition, the second coating layer (C2) may be made of a variety of molybdenum coating layer and the like for reducing friction.

In addition, the magnet 130 having an annular ring shape is mounted on the inner circumferential surface of the side wall part 123 so as to face the armature 160 including the core 161 and the coil 162.

Next, in the fixing part, the sleeve 140 supports the rotation shaft 110 to be rotatable, and the sleeve 140 is fixed to the inner circumference of the base 150.

The cover 180 is for sealing the oil injected to form the hydrodynamic bearing, and is fixed to the inner circumferential surface of the lower end of the sleeve 150.

A radial hydrodynamic bearing unit (not shown), which is a hydrodynamic bearing unit, is formed between the sleeve 140 and the rotation shaft 110. More specifically, the radial dynamic bearing portion is a minute gap is formed between the rotating shaft 110 and the sleeve 140, the oil is filled in the minute gap is formed a radial dynamic bearing part.

To this end, the radial dynamic pressure bearing portion is formed by selectively forming a dynamic pressure generating groove (not shown) on the inner circumferential surface of the sleeve 140 and the outer circumferential surface of the rotating shaft 110 opposite thereto. In addition, two dynamic pressure generating grooves may be selectively formed at the upper and lower portions of the inner circumferential surface of the sleeve or at the upper and lower portions of the outer circumferential surface of the rotating shaft.

In addition, an armature 160 composed of a core 161 and a coil 162 is fixed to the outer circumferential portion of the base 150 by pressing or bonding, and the inner circumferential portion of the base 150. The sleeve 140 is fixed by press fitting or adhesion.

Next, the pulling plate 170 is positioned to be opposed to the magnet 120 in the axial direction and fixed to the base 170 to prevent the floating of the hub 150.

In the spindle motor according to the present invention, a thrust dynamic pressure bearing part may be formed in a gap between the hub 120 and the sleeve 140 and / or a gap between the sleeve 140 and the flange part 111 of the rotation shaft 110.

2 is a partial cross-sectional view schematically showing a spindle motor according to a second embodiment of the present invention. As shown, the spindle motor according to the second embodiment differs only in the formation position of the first coating layer C1 as compared with the spindle motor shown in FIG.

More specifically, the first coating layer C1 is formed on one surface of the sleeve opposite to the flange portion 111 of the rotating shaft with respect to the axial direction of the rotating shaft. In this way, it is possible to solve the problem of damage and deterioration of driving characteristics due to the surface contact and friction of the flange 111 and the sleeve in case of over-injury of the rotating part.

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 scope of the invention as defined by the appended claims. It will be apparent that modifications and improvements can be made by those skilled in the art.

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 120: hub
130: Magnet 140: Sleeve
150: base 160: armature
170: pulling plate 180: cover
C1, C2: coating layer

Claims (7)

A rotating part including a rotating shaft, a hub and a magnet, a sleeve rotatably supporting the rotating shaft, a base to which the sleeve is coupled, and an armature opposed to and fixed to the base, the armature consisting of a core and a coil; A spindle motor comprising a fixed part and filled with oil to form a hydrodynamic bearing part between the rotating part and the fixed part.
Spindle motor, characterized in that the coating layer is selectively formed on one surface of the sleeve and the rotating shaft facing each other to prevent axial surface contact friction of the sleeve and the rotating shaft.
The method according to claim 1,
The lower end of the rotating shaft is formed with a flange, the spindle motor, characterized in that the coating layer is formed on one surface of the flange portion opposed to the sleeve in the axial direction of the rotating shaft.
The method according to claim 1,
The lower end is formed with a flange, the spindle motor, characterized in that the coating layer is formed on one surface of the sleeve facing the flange in the axial direction of the rotation axis.
The method according to claim 1,
The coating layer is a spindle motor, characterized in that consisting of molybdenum coating or Teflon coating.
The method according to claim 1,
The hub is a spindle motor, characterized in that the coating layer is further formed on one surface facing the sleeve to prevent axial surface contact friction with the sleeve in the axial direction of the rotation axis.
The method according to claim 5,
The hub
A cylindrical part fixed to an upper end of the rotating shaft;
A disc portion extending radially outward from the cylinder portion;
A side wall portion extending downward in the axial direction of the rotation shaft at a radially outer end of the disc portion; And
It consists of a sealing portion opposed to the outer circumferential surface of the sleeve and extending downward in the axial direction of the rotation axis to form the interface of the oil,
Spindle motor, characterized in that the coating layer is formed on one surface of the disc portion opposite to the sleeve.
The method according to claim 5 or 6,
The coating layer is a spindle motor, characterized in that the molybdenum coating.
KR1020110103762A 2011-10-11 2011-10-11 Spindle motor KR20130039236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110103762A KR20130039236A (en) 2011-10-11 2011-10-11 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110103762A KR20130039236A (en) 2011-10-11 2011-10-11 Spindle motor

Publications (1)

Publication Number Publication Date
KR20130039236A true KR20130039236A (en) 2013-04-19

Family

ID=48439483

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110103762A KR20130039236A (en) 2011-10-11 2011-10-11 Spindle motor

Country Status (1)

Country Link
KR (1) KR20130039236A (en)

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