KR20140076173A - Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same - Google Patents

Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same Download PDF

Info

Publication number
KR20140076173A
KR20140076173A KR1020120144421A KR20120144421A KR20140076173A KR 20140076173 A KR20140076173 A KR 20140076173A KR 1020120144421 A KR1020120144421 A KR 1020120144421A KR 20120144421 A KR20120144421 A KR 20120144421A KR 20140076173 A KR20140076173 A KR 20140076173A
Authority
KR
South Korea
Prior art keywords
shaft
sleeve
sealing member
sealing
oil
Prior art date
Application number
KR1020120144421A
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 KR1020120144421A priority Critical patent/KR20140076173A/en
Publication of KR20140076173A publication Critical patent/KR20140076173A/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
    • 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
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs

Landscapes

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

Abstract

A fluid dynamic pressure bearing sealing module according to the present invention comprises a shaft, a holder fixedly coupled to the shaft, a thrust plate fixedly coupled to the shaft, a sleeve rotatably supported by the shaft, And a sealing member positioned to face the plate, wherein fluid is filled in the minute gap between the shaft and the sleeve to form a fluid dynamic pressure bearing portion, and a lower oil sealing portion is formed between the holder and the sleeve in the axial direction of the shaft An upper oil sealing portion is formed in the axial direction of the shaft between the thrust plate and the sealing member and an oil injection and interface management hole is formed in the sleeve so as to face the lower oil sealing portion, The hole is covered by the sealing member.

Description

[0001] The present invention relates to a fluid dynamic pressure bearing sealing module and a spindle motor including the hydrodynamic bearing sealing module,

The present invention relates to a fluid dynamic pressure bearing sealing module and a spindle motor including the same.

2. Description of the Related Art Generally, a spindle motor used as a drive device for a recording disk, such as a hard disk, stores a lubricant such as oil between a rotating portion and a fixed portion at the time of rotation of a motor, It is widely used.

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.

The spindle motor according to the prior art, which includes the prior art documents, has a problem in that the oil injected for forming the hydrodynamic pressure bearing is evaporated to the outside and the motor life is shortened Not only unstable motor driving is caused but also oil injection and interface management are difficult.

Patent Document 1: Korean Patent No. 10-0200598

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide an oil injection and interface management hole in a sleeve, which facilitates oil injection and oil interface management for forming a lower oil sealing portion, A fluid dynamic pressure bearing sealing module that covers the oil injection and interface management holes to form an upper oil sealing portion and covers the upper oil sealing portion with a cover to facilitate oil injection and interface management of the upper oil sealing portion, To provide a spindle motor.

A fluid dynamic pressure bearing sealing module according to an embodiment of the present invention includes a shaft, a holder fixedly coupled to the shaft, a thrust plate fixedly coupled to the shaft, a sleeve rotatably supported by the shaft, And a sealing member positioned to face the thrust plate, the fluid pressure bearing portion being filled with oil at a minute gap between the shaft and the sleeve, and between the holder and the sleeve, An oil sealing portion is formed, an upper oil sealing portion is formed in the axial direction of the shaft between the thrust plate and the sealing member, an oil injection and interface management hole is formed in the sleeve so as to face the lower oil sealing portion, The injection and interface management holes are covered by the sealing member.

Further, the sealing member of the fluid dynamic pressure bearing sealing module according to an embodiment of the present invention is fixedly coupled to the sleeve so as to cover the other side of the oil injection and interface maintenance hole, one side of which is opposed to the lower oil sealing portion.

Further, the sealing member of the fluid dynamic pressure bearing sealing module according to an embodiment of the present invention is formed in a ring shape, and a tapered portion is formed in the axial direction of the shaft.

The fluid dynamic pressure bearing sealing module according to an embodiment of the present invention further includes a cover coupled to the sealing member for covering the upper oil sealing portion and positioned above the upper oil sealing portion in the axial direction of the shaft.

In addition, the sealing member of the hydrodynamic pressure bearing sealing module according to an embodiment of the present invention is formed with a receiving groove portion opposed to the cover, a protruding engaging portion corresponding to the receiving groove portion is formed in the cover, A protruding engaging portion is inserted to join the sealing member and the cover.

The spindle motor includes a sleeve-integrated hub, a magnet coupled to an inner circumferential surface of the sleeve-integrated hub, a rotating member including a sealing member coupled to the sleeve, A hub which rotatably supports the sleeve-integrated hub; a thrust plate which is coupled to the shaft and positioned so as to face the sealing member; a holder to which the shaft is fixedly coupled; And a fluid dynamic pressure bearing portion is formed between the rotary portion and the fixed portion, and a lower oil sealed portion is formed between the holder and the sleeve-integrated hub in the axial direction of the shaft Between the thrust plate and the sealing member, An oil injection and interface management holes are formed in the sleeve so as to face the lower oil sealing portion, and the oil injection and interface management holes are covered by the sealing member.

In the spindle motor according to the embodiment of the present invention, the sleeve-integrated hub includes a sleeve portion facing the shaft, And a side wall portion extending downward in the axial direction of the shaft at a radially outer end of the disk portion.

Further, in the spindle motor according to an embodiment including the fluid dynamic pressure bearing sealing module according to the present invention, the oil injection and interface management holes may be formed in the disc portion to be opposed to the lower oil sealing portion.

 Further, in the spindle motor according to the embodiment of the present invention including the hydrodynamic pressure bearing sealing module according to the present invention, the sealing member may be formed to cover the other side of the oil injection and interface management holes, And is fixedly coupled to the sleeve.

Further, in the spindle motor according to the embodiment including the fluid dynamic pressure bearing sealing module according to the present invention, the sealing member is formed in a ring shape, and a tapered portion is formed in the axial direction of the shaft.

A spindle motor according to an embodiment including a hydrodynamic pressure bearing sealing module according to the present invention is further provided with a spindle motor which is coupled to the sealing member for covering the upper oil sealing portion and is located above the upper oil sealing portion in the axial direction of the shaft And further includes a cover.

In the spindle motor according to an embodiment of the present invention including the fluid dynamic pressure bearing sealing module according to the present invention, the sealing member is formed with a receiving groove portion opposed to the cover, and the cover is provided with a protrusion coupling portion And a protruding engaging portion is inserted into the receiving groove portion so that the sealing member and the cover are engaged with each other.

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, an oil injection and interface management holes are formed in the sleeve to facilitate oil injection and oil interface management for forming a lower oil sealing portion, cover the oil injection and interface management holes with a sealing member, And covering the upper oil sealing portion with a cover, oil fluid injection and interface management of the upper oil sealing portion can be facilitated, and a fluid dynamic pressure bearing sealing module and a spindle motor including the fluid dynamic pressure bearing sealing module can be obtained.

1 is a cross-sectional view schematically showing a fluid dynamic pressure bearing sealing module according to an embodiment of the present invention;
2 is a cross-sectional view schematically illustrating a spindle motor according to an embodiment including a fluid dynamic pressure bearing sealing module according to 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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a sealing module of a fluid dynamic pressure bearing and a spindle motor including the sealing module according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically illustrating a fluid dynamic pressure bearing sealing module according to an embodiment of the present invention. As shown, the fluid dynamic pressure bearing sealing module includes a shaft 10, a holder 20, a sleeve 30, a thrust plate 40, a sealing member 50, and a cover 60.

More specifically, the shaft 10 rotatably supports the sleeve 30, the thrust plate 40 is fixedly coupled to the upper end of the shaft 10, and the holder 20 is fixed to the lower end portion by press fitting, adhesion, or the like.

In addition, oil is injected at a minute interval between the shaft 10 and the sleeve 20 to form a hydrodynamic pressure bearing portion, and an oil sealing portion is formed at the upper portion and the lower portion of the sleeve 20, respectively. The sleeve 30 is mounted on the thrust plate 40 such that the sealing member 50 is mounted on the thrust plate 40 and between the sealing member 50 and the thrust plate 40 in the axial direction of the shaft 10, A lower sealing part LS is formed between the sleeve 30 and the holder 20 in the axial direction of the shaft.

The fluid dynamic pressure bearing sealing module is provided with oil injection and interface management holes 31 in the sleeve 30 for oil injection and oil interface management. That is, the oil injection and interface management holes 31 are formed to face the lower oil sealing portion LS formed between the holder and the sleeve.

The sealing member 50 covers the other side of the oil injection and interface management hole 31, which is opposite to the lower oil sealing portion LS, so as to cover the oil injection and interface management holes 31, To the sleeve (30). The cover 50 and the sleeve 50 may be formed by various methods such as bonding and screwing.

That is, the sealing member 50 of the fluid dynamic pressure bearing sealing module according to one embodiment of the present invention is fixedly coupled to the sleeve so as to cover the other side of the oil injection and interface management holes, And forms an oil sealing portion and covers the oil injection and interface management holes 31 formed in the sleeve for the lower oil sealing portion.

To this end, the sealing member 50 is formed in a ring shape, and a tapered portion 51 is formed in the axial direction of the shaft. As described above, an upper sealing part (US) is formed in the axial direction of the shaft 10 between the tapered part 51 and the thrust plate.

The cover 60 covers an upper sealing part (US) formed between the taper part 51 of the sealing member 50 and the thrust plate. The sealing member 50 And is positioned above the upper oil sealing portion in the axial direction of the shaft.

The sealing member 50 and the cover 60 are coupled to each other by the sealing member 50. The sealing member 50 and the cover 60 are coupled to the sealing member 50 by a receiving groove 52, The protruding engaging portion 61 is formed and the protruding engaging portion 61 is inserted into the receiving groove 52 so that the engaging force and rigidity are improved and the height of the shaft is restricted in the axial direction. .

As described above, the sealing module of the hydrodynamic pressure bearing according to the embodiment of the present invention has the oil injection and interface management holes formed in the sleeve to facilitate oil injection and oil interface management for forming the lower oil sealing portion And sealing the upper oil sealing portion with the cover to cover the oil injection and interface management holes with the sealing member and cover the upper oil sealing portion with the cover so that oil injection and interface management of the upper oil sealing portion can be easily performed. You can get the module.

2 is a cross-sectional view schematically illustrating a spindle motor according to an embodiment including a fluid dynamic pressure bearing sealing module according to the present invention.

The spindle motor 100 includes an armature 150 formed of a shaft 110, a holder 120, a base 130, a thrust plate 140, a core 151 and a coil 152 And a rotating part including a sleeve part, a hub part (160), a magnet (170), a sealing part (180), and a cover (190). The working fluid is filled with fluid, . The sleeve-integrated hub 160 is formed with an oil injection and interface management hole 162a. The sealing member 180 covers the oil injection and interface management holes 162a, A sealing portion is formed, and the cover covers the oil sealing portion.

More specifically, in the rotary part, the sleeve-integrated hub 160 is inserted into the shaft 120 and is rotatably supported. In addition, the inner diameter portion of the sleeve-integrated hub 110 is slightly spaced from the outer diameter portion of the shaft 110, and oil is filled at the minute intervals to form a radial dynamic pressure bearing portion.

To this end, a dynamic pressure generating groove is optionally formed in the inner diameter portion of the sleeve-integrated hub 160 or the outer diameter portion of the shaft 110.

The sleeve-integrated hub 160 includes a sleeve portion 161 that is opposed to the shaft 110 and is cylindrical, a disc portion 162 that extends radially outward from the sleeve portion 161, And a side wall portion 163 extending downward in the axial direction of the shaft at the radially outer end of the shaft 162.

The magnet 170 is mounted on the inner circumferential surface of the side wall portion 163 so as to face the armature 150 composed of the core 151 and the coil 152.

A lower sealing part LS is formed between the sleeve part 161 of the sleeve-integrated hub 160 and the holder 120 in the axial direction of the shaft, An oil injection and interface management hole 162a is formed in the sleeve to oppose the lower oil sealing portion and to perform oil injection and oil interface management.

The sealing member 180 covers the oil injection and interface management holes 162a and forms the upper thrust plate and the upper oil sealing part (US).

That is, the sealing member 180 is fixedly coupled to the sleeve-integrated hub 160 so as to cover the other side of the oil injection and interface management hole 162a, which is opposite to the lower oil sealing portion LS. That is, the oil injection and interface management holes 162a are formed in the disc portion 162, so that the sealing member 180 is coupled to the disc portion 162.

The coupling between the sealing member 180 and the sleeve-integrated hub 160 may be realized by various methods such as bonding and screw coupling.

Also, the sealing member 180 may be formed to have a size and shape corresponding to the oil injection and interface management holes 162a.

Further, the sealing member 180 is formed in a ring shape, and a tapered portion 181 is formed in the axial direction of the shaft. As described above, an upper oil sealing portion US is formed in the axial direction of the shaft 110 between the taper portion 181 and the thrust plate 140.

The cover 190 is for covering an upper sealing part formed between the taper part 181 of the sealing member 180 and the thrust plate and the sealing member 180 And is positioned above the upper oil sealing portion US in the axial direction of the shaft.

The sealing member 180 is coupled to the cover 190 by a receiving groove 182 formed in the sealing member and a protruding engaging portion 191 corresponding to the receiving groove 182 is formed in the cover 190. [ And a protruding engaging portion 191 is inserted into the receiving groove portion 182 so that the engaging force and rigidity are improved and the height of the shaft can be freely limited in the axial direction.

The shaft 110 rotatably supports the sleeve-integrated hub 160, the thrust plate 140 is fixedly coupled to the upper end of the shaft 110, and the holder 120 is press- And is fixed by adhesion or the like.

The holder 120 is press-fitted into the inner circumference of the base 130 and an armature 150 composed of a core 151 and a coil 152 is inserted into the outer circumference of the base 130 so as to face the magnet 170, And the like.

Further, in the spindle motor according to the present invention, the holder and the base may be integrally formed.

A lower sealing part LS is formed between the sleeve-integrated hub 160 and the holder 120 in the spindle motor 100.

As described above, the spindle motor 100 according to an embodiment including the hydrodynamic pressure bearing module according to the present invention includes an oil injection port and an interface management hole formed in the sleeve, The oil injection and interfacial management of the upper oil sealing portion can be easily performed by covering the oil injection and interface management holes with the sealing member and forming the upper oil sealing portion by covering the upper oil sealing portion with the cover, A spindle motor can be easily obtained.

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.

10: shaft 20: holder
30: Sleeve
31: Oil injection and interface management hole 40: Thrust plate
50: sealing member 51: tapered portion
52: receiving groove 60: cover
61:
LS: Lower oil seal part US: Upper oil seal part
100: Spindle motor
110: shaft 120: holder
130: base 140: thrust plate
150: armature 151: core
152: Coil 160: Sleeve-integrated hub
161: Sleeve portion 162:
163: side wall portion 162a: oil injection and interface management hole
170: Magnet 180: Sealing member
181: tapered portion 182: receiving groove
190: cover 191:

Claims (12)

A thrust plate fixedly coupled to the shaft, a sleeve rotatably supported by the shaft, and a sealing member coupled to the sleeve and positioned to face the thrust plate, wherein the shaft includes a holder fixedly coupled to the shaft, and,
Oil is filled in a minute gap between the shaft and the sleeve to form a fluid dynamic pressure bearing portion,
A lower oil sealing portion is formed in the axial direction of the shaft between the holder and the sleeve, an upper oil sealing portion is formed in the axial direction of the shaft between the thrust plate and the sealing member, Wherein an oil injection and interface management holes are formed, and the oil injection and interface management holes are covered by the sealing member.
The method according to claim 1,
The sealing member
Wherein the sleeve is fixedly coupled to the sleeve so as to cover the other side of the oil injection and interface management holes, one side of which is opposed to the lower oil sealing portion.
The method of claim 2,
Wherein the sealing member is ring-shaped, and a tapered portion is formed in an axial direction of the shaft.
The method according to claim 1,
Further comprising: a cover coupled to the sealing member for covering the upper oil sealing portion and positioned above the upper oil sealing portion in the axial direction of the shaft.
The method of claim 4,
Wherein the sealing member is formed with a receiving groove portion opposed to the cover, a protruding engaging portion corresponding to the receiving groove portion is formed in the cover, and a protruding engaging portion is inserted into the receiving groove portion, Fluid hydrodynamic bearing sealing module.
A rotary unit including a sleeve-integrated hub, a magnet coupled to an inner circumferential surface of the sleeve-integrated hub, and a sealing member coupled to the sleeve,
A hub which rotatably supports the sleeve-integrated hub; a thrust plate which is coupled to the shaft and positioned so as to face the sealing member; a holder to which the shaft is fixedly coupled; And a fluid dynamic pressure bearing portion is formed between the rotary portion and the fixed portion,
A lower oil seal portion is formed in the axial direction of the shaft between the holder and the sleeve-integrated hub, an upper oil seal portion is formed in the axial direction of the shaft between the thrust plate and the seal member, An oil injection and interface management holes are formed in the sleeve, and the oil injection and interface management holes are covered by the sealing member.
The method of claim 6,
The sleeve-
A sleeve portion facing the shaft;
A disc portion extending radially outward from the sleeve portion; And
And a sidewall portion extending downward in the axial direction of the shaft at a radially outer end of the disk portion.
The method of claim 7,
And an oil injection and interface maintenance holes are formed in the disk portion so as to face the lower oil sealing portion.
The method of claim 6,
The sealing member
And the other end of the oil injection and interface maintenance hole, which is opposite to the lower oil sealing portion, is fixed to the sleeve.
The method of claim 9,
Wherein the sealing member is ring-shaped, and a tapered portion is formed in an axial direction of the shaft.
The method of claim 6,
Further comprising a cover coupled to the sealing member for covering the upper oil sealing portion and located on the upper portion of the upper oil sealing portion in the axial direction of the shaft.
The method of claim 11,
Wherein the sealing member is formed with a receiving groove portion opposed to the cover, a protruding engaging portion corresponding to the receiving groove portion is formed in the cover, and a protruding engaging portion is inserted into the receiving groove portion, Spindle motor.
KR1020120144421A 2012-12-12 2012-12-12 Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same KR20140076173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120144421A KR20140076173A (en) 2012-12-12 2012-12-12 Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120144421A KR20140076173A (en) 2012-12-12 2012-12-12 Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same

Publications (1)

Publication Number Publication Date
KR20140076173A true KR20140076173A (en) 2014-06-20

Family

ID=51128566

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120144421A KR20140076173A (en) 2012-12-12 2012-12-12 Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same

Country Status (1)

Country Link
KR (1) KR20140076173A (en)

Similar Documents

Publication Publication Date Title
KR100691607B1 (en) A hydrodynamic bearing motor uing a fixed shaft
KR20140035651A (en) Spindle motor and hard disk drive including the same
KR20130016806A (en) Spindle motor
KR20130107506A (en) Fluid hydrodynamic bearing and spindle motor having the same
KR101310425B1 (en) Hydrodynamic bearing module and Spindle Motor having the same
KR20140076173A (en) Sealing Module of Hydrodynamic Bearing and Spindle Motor having the same
US20150214809A1 (en) Motor with Thrust Bearing
KR20140077252A (en) Module of Hydrodynamic Bearing and Spindle Motor having the same
KR20140055504A (en) Spindle motor
KR101397335B1 (en) Hydrodynamic Bearing Module and Spindle Motor having the same
KR101516041B1 (en) Spindle Motor
KR20130031664A (en) Spindle motor
KR20130051323A (en) Electromagnetic module and spindle motor having the same
KR20150081884A (en) Spindle motor and hard disk drive including the same
KR20130101845A (en) Spindle motor
KR101516043B1 (en) Spindle Motor and Manufacturing Method of the same
KR20140077266A (en) Hydrodynamic Bearing Module and Spindle Motor having the same
KR20130043973A (en) Spindle motor
KR20130038650A (en) Spindle motor
KR20130075283A (en) Spindle motor having the same
KR20130074309A (en) Hydrodynamic bearing module and spindle motor having the same
KR20140017206A (en) Sealing moudle of hydrodynamic bearing and spindle motor having the same
KR20130059918A (en) Spindle motor
KR20130103118A (en) Shaft moudle for spindle motor and spindle motor having the same
KR20130107507A (en) Base for spindle motor and spindle motor having the same

Legal Events

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