KR20130050099A - Spindle motor - Google Patents

Spindle motor Download PDF

Info

Publication number
KR20130050099A
KR20130050099A KR1020110115260A KR20110115260A KR20130050099A KR 20130050099 A KR20130050099 A KR 20130050099A KR 1020110115260 A KR1020110115260 A KR 1020110115260A KR 20110115260 A KR20110115260 A KR 20110115260A KR 20130050099 A KR20130050099 A KR 20130050099A
Authority
KR
South Korea
Prior art keywords
sleeve
oil
spindle motor
cover
receiving groove
Prior art date
Application number
KR1020110115260A
Other languages
Korean (ko)
Inventor
최진영
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 KR1020110115260A priority Critical patent/KR20130050099A/en
Publication of KR20130050099A publication Critical patent/KR20130050099A/en

Links

Images

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
    • G11B33/1446—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
    • G11B2220/21—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

Landscapes

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

Abstract

PURPOSE: A spindle motor is provided to form a curved unit on a cover, thereby preventing oil from being exposed to the outside when external force or shock is existed. CONSTITUTION: A cover(190) seals injected oil and covers a lower part of a sleeve(150). The cover is fixed to inner periphery of the lower part of the sleeve. A curved unit is protruded to the lower part of the sleeve for a shaft direction of a rotation shaft in a center unit of the cover. When the rotation shaft is upwardly and downwardly moved by external force, the oil is received to an oil receiving groove(151) of the sleeve. The oil receiving groove provides damping effect for movement of the oil.

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.

In the spindle motor having a hydrodynamic bearing according to the related art, oil is injected between the rotating part and the fixed part to form the hydrodynamic bearing part. However, when an external force or an impact in the axial direction is applied to the spindle motor, the oil interface collapses and the oil leaks to the outside.

The present invention has been made in order to solve the above problems, when an external force or impact is applied to the cover coupled to the rotary inner shaft and the lower inner peripheral surface of the sleeve to form a curved portion projecting to the lower portion of the sleeve in the axial direction of the rotary shaft It is to provide a spindle motor that can be implemented as a stable system without oil leaking to the outside.

The present invention comprises 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, opposed to the magnet and fixedly coupled to the base, and comprising a core and a coil. A spindle motor comprising an armature and a fixed portion including a cover coupled to the sleeve, wherein the oil is filled with a hydrodynamic bearing portion formed between the rotary portion and the fixed portion. A curved portion projecting downward is formed.

In addition, an oil receiving groove is formed in the lower inner peripheral portion of the sleeve.

In addition, the rotating shaft has a flange portion formed in the lower axial direction, the oil receiving groove is formed in the axial lower end of the flange portion.

In addition, the rotating shaft has a flange portion formed in the lower axial direction, the lower inner peripheral portion of the sleeve is formed with an oil receiving groove adjacent to the flange portion.

In addition, the cover has a disc shape.

In addition, the fixing portion further includes a pulling plate coupled to one surface of the sleeve facing the magnet.

In addition, the rotating unit further includes a thrust plate coupled to the rotating shaft and the oil is injected into the sleeve and the gap to form a thrust dynamic bearing.

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 curved portion projecting to the lower portion of the sleeve with respect to the axial direction of the rotating shaft is formed on the cover which is coupled to the rotating shaft and the lower inner circumferential surface of the sleeve. A spindle motor that can be implemented can be obtained.

1 is a cross-sectional view schematically showing a spindle motor according to the present invention.
FIG. 2 is a partial cross-sectional view schematically showing a state of use of the spindle motor shown in FIG.
3 is a cross-sectional view schematically showing the cover of the spindle motor shown in FIG.

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 includes a rotating part including a rotating shaft 110, a hub 120, a magnet 130, and a thrust plate 140, a sleeve 150, a base 160, and an armature ( 170), and a fixing part including a pulling plate (pulling plate) 180 and the cover 190, the working fluid is filled with oil to form a hydrodynamic bearing between the rotating part and the fixing part.

In addition, the spindle motor 100 according to the present invention is designed to increase the axial damping force of the rotary shaft 110 when the vibration or impact is applied to the outside to prevent the outflow of oil due to the collapse of the oil interface Is implemented.

To this end, an axial curved portion is formed in the cover 190 which is located in the lower axial direction of the rotary shaft, and is coupled to the inner circumferential surface of the lower end of the sleeve to prevent leakage of oil, and an oil receiving groove is formed in the lower inner circumferential surface of the sleeve. Let's do it.

Detailed description will be given of the specific technical configuration and organic combination of components to implement the optimal design.

First, in the rotating part, the rotating shaft 110 is formed in the upper coupling portion 111 to which the hub 120 and the thrust plate 140 is coupled, the flange portion 112 is formed at the bottom The oil receiving groove 113 is formed at the lower end of the flange portion 112 in the axial direction.

In addition, the flange portion 112 extends in the radial direction of the rotary shaft from the lower end of the rotary shaft 110.

The oil receiving groove 113 may not only extend the service life of the oil, but also buffer the axial shock of the rotating shaft, thereby preventing oil leakage by preventing sudden flow of oil.

In addition, the hub 120 is a cylindrical portion 121 coupled to the upper coupling portion 111 of the rotating shaft 110, a disc portion 122 extending radially outward from the cylindrical portion 121, the disc portion A side wall portion 123 extending downward in the axial direction of the rotation shaft at the radially outer end of the 122, a sealing portion extending downward in the axial direction of the rotation shaft in the disc portion 122, the sealing member 140 is mounted It consists of 124.

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 170 including the core 171 and the coil 172.

In addition, the thrust plate 140 is coupled to the rotating shaft and oil is injected into the sleeve and the gap to form a thrust dynamic bearing. To this end, a dynamic pressure generating groove may be formed on one surface of the thrust plate 140 or the sleeve 150 facing each other.

Next, in the fixing part, the sleeve 150 supports the rotating shaft 110 to be rotatable, and is coupled to the base 160.

In addition, the oil receiving groove 151 is formed on the lower inner circumferential surface of the sleeve 150, and more specifically, the oil receiving groove 151 is formed adjacent to the flange portion 112 of the rotating shaft 110. The oil receiving groove 151 is for preventing oil leakage by preventing sudden flow of oil due to the axial impact of the rotating shaft. More specifically, as shown by the arrow in Fig. 2, when the rotary shaft 110 is moved up / down with respect to the axial direction by an external impact light, the oil at the lower portion of the flange 112 of the rotary shaft 110 The oil flowing into the sleeve but flowing is accommodated in the oil receiving groove 115 of the sleeve 150 and the oil receiving groove 115 damps the flow of the oil, thereby destroying the oil interface due to the sudden flow of the oil. Leak is prevented.

In addition, the sleeve 150 may be formed with an oil circulation hole (not shown) in the axial direction of the rotary shaft 110 to connect the upper and lower surfaces of the sleeve 150 so that the oil circulates through the rotary shaft system.

And the pulling plate (pulling plate) (180) is to prevent the injuries of the rotating part, is coupled to one surface of the sleeve opposite the magnet 130.

The cover 190 seals the oil injected to form the hydrodynamic bearing, and covers the lower portion of the sleeve, and is fixedly coupled to the inner circumferential surface of the lower end of the sleeve 150. In addition, the cover 190 of the spindle motor according to the present invention is formed in a disc shape, as shown in Figures 2 and 3, the central portion is formed with a curved portion 191 protruding to the lower portion of the sleeve with respect to the axial direction of the rotation axis do. More specifically, the curved portion 191 is formed to protrude at a predetermined angle with respect to the direction orthogonal to the axis of the rotation axis, as shown by α in FIGS. 2 and 3.

A radial hydrodynamic bearing part (not shown), which is a hydrodynamic bearing part, is formed between the sleeve 150 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 150, the oil is filled in the minute gap is formed a radial dynamic bearing 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 110: rotation axis
120: hub 130: magnet
140: thrust plate 150: sleeve
151: oil receiving groove 160: base
170: armature 171: core
172: coil 180: pulling plate
190: cover 191: curved portion

Claims (7)

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, an arm opposing and fixed to the base, the core and a coil, A spindle motor comprising a fixed part including a cover coupled to the sleeve, and filled with oil to form a hydrodynamic bearing part between the rotating part and the fixed part.
The cover is a spindle motor, characterized in that the curved portion protruding to the lower portion of the sleeve with respect to the axial direction of the rotation axis.
The method according to claim 1,
Spindle motor, characterized in that the oil receiving groove is formed in the lower inner peripheral portion of the sleeve.
The method according to claim 1,
The rotating shaft is a spindle motor, characterized in that the flange portion is formed in the lower axial direction, the oil receiving groove is formed in the axial lower end of the flange portion.
The method according to claim 1,
The rotation shaft is a spindle motor, characterized in that the flange portion is formed in the lower axial direction, the lower inner peripheral portion of the sleeve is formed with an oil receiving groove adjacent to the flange portion.
The method according to claim 1,
Spindle motor, characterized in that the cover is made of a disc.
The method according to claim 1,
The fixed portion
And a pulling plate coupled to one side of the sleeve opposite the magnet.
The method according to claim 1,
The rotating part
And a thrust plate coupled to the rotating shaft and injecting oil into a gap with the sleeve to form a thrust dynamic bearing.

KR1020110115260A 2011-11-07 2011-11-07 Spindle motor KR20130050099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110115260A KR20130050099A (en) 2011-11-07 2011-11-07 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110115260A KR20130050099A (en) 2011-11-07 2011-11-07 Spindle motor

Publications (1)

Publication Number Publication Date
KR20130050099A true KR20130050099A (en) 2013-05-15

Family

ID=48660619

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110115260A KR20130050099A (en) 2011-11-07 2011-11-07 Spindle motor

Country Status (1)

Country Link
KR (1) KR20130050099A (en)

Similar Documents

Publication Publication Date Title
KR100691607B1 (en) A hydrodynamic bearing motor uing a fixed shaft
KR20130016806A (en) Spindle motor
KR20130107506A (en) Fluid hydrodynamic bearing and spindle motor having the same
JP2012143127A (en) Spindle motor
KR20120076263A (en) Spindle motor and driving device of recording disc of having the same
KR101310425B1 (en) Hydrodynamic bearing module and Spindle Motor having the same
KR20130050099A (en) Spindle motor
KR101516041B1 (en) Spindle Motor
KR20130051323A (en) Electromagnetic module and spindle motor having the same
JP2014105866A (en) Sealing module of hydrodynamic bearing and spindle motor including the same
KR20130094073A (en) Fluid hydrodynamic bearing and spindle motor having the same
KR20130103118A (en) Shaft moudle for spindle motor and spindle motor having the same
KR20130031664A (en) Spindle motor
KR20130096016A (en) Hub for spindle motor and spindle motor having the same
KR101461265B1 (en) Spindle Motor
KR20130107507A (en) Base for spindle motor and spindle motor having the same
KR20130059928A (en) Spindle motor
KR20120140068A (en) Spindle motor
KR101397335B1 (en) Hydrodynamic Bearing Module and Spindle Motor having the same
KR20150105731A (en) Spindle motor and hard disk drive including the same
KR20130108847A (en) Spindle motor
KR20130075283A (en) Spindle motor having the same
KR20130045043A (en) Spindle motor
KR20130095414A (en) Spacer for spindle motor and spindle motor having the same
KR20120084145A (en) Spindle motor

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination