KR20150008296A - Hydrodynamic bearing assembly and motor including the same - Google Patents

Hydrodynamic bearing assembly and motor including the same Download PDF

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Publication number
KR20150008296A
KR20150008296A KR20130082201A KR20130082201A KR20150008296A KR 20150008296 A KR20150008296 A KR 20150008296A KR 20130082201 A KR20130082201 A KR 20130082201A KR 20130082201 A KR20130082201 A KR 20130082201A KR 20150008296 A KR20150008296 A KR 20150008296A
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KR
South Korea
Prior art keywords
sleeve
housing
sealing adhesive
shaft
groove
Prior art date
Application number
KR20130082201A
Other languages
Korean (ko)
Inventor
김덕영
Original Assignee
삼성전기주식회사
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Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR20130082201A priority Critical patent/KR20150008296A/en
Publication of KR20150008296A publication Critical patent/KR20150008296A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/107—Grooves for generating pressure
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sliding-Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

A fluid dynamic pressure bearing assembly according to an embodiment of the present invention includes: a sleeve that supports the shaft such that an upper end of the shaft protrudes upward in the axial direction, and forms a bearing gap between the shaft and the lubricant; And a housing having an outer circumferential portion surrounding at least a part of the radial surface of the sleeve and a cover portion surrounding the axially lower portion, and a fluid hydrodynamic bearing assembly having a sealing adhesive applied to the outer surface of the cover portion for preventing leakage of the lubricant, .

Description

[0001] The present invention relates to a hydrodynamic bearing assembly and a motor including the hydrodynamic bearing assembly,

The present invention relates to a hydrodynamic bearing assembly and a motor including the same.

In general, a small spindle motor used in a hard disk drive (HDD) is provided with a hydrodynamic bearing assembly, and a bearing clearance formed between the shaft and the sleeve of the hydrodynamic bearing assembly is lubricated The fluid is filled. As the oil filled in the bearing gap is compressed, fluid dynamic pressure is formed and the shaft is rotatably supported.

That is, in general, the hydrodynamic pressure bearing assembly generates dynamic pressure through a spiral groove in an axial direction and a herringbone-shaped groove in a circumferential direction, thereby achieving stability of motor rotation drive.

Accordingly, the problem of preventing leakage of the oil in the fluid dynamic pressure bearing assembly is emphasized.

Therefore, in the prior art, it has been attempted to prevent leakage of oil by changing the material composition of the metal part around the oil sealing part or adjusting the thickness.

However, when the composition of the material is changed, there is a problem of abrasion resistance and corrosion of the metal parts, and there are physical limitations such as a processing method in the case of adjusting the thickness, and there is a limit in preventing oil leakage.

Therefore, as described above, research for preventing leakage of oil without changing the material composition and thickness of metal parts is urgent.

The present invention provides a fluid dynamic pressure bearing assembly and a spindle motor having the fluid dynamic pressure bearing assembly capable of preventing leakage of oil without involving changes in thickness and material composition of a housing in which oil is sealed.

The fluid dynamic pressure bearing assembly according to an embodiment of the present invention includes a sleeve that supports the shaft such that an upper end of the shaft protrudes upward in the axial direction and forms a bearing gap between the shaft and the lubricant, And a cover portion surrounding the outer circumferential portion and the axially lower portion of at least a portion of the radial surface of the sleeve, and a sealing adhesive for preventing leakage of the lubricant may be applied to the outer surface of the cover portion.

In the fluid dynamic pressure bearing assembly according to another embodiment of the present invention, the inner surface of the cover portion may be formed to be inserted into the lower axial direction.

In the hydrodynamic bearing assembly according to another embodiment of the present invention, the outer surface of the cover part is drawn in the upper axial direction, and the drawn part can be filled with the sealing adhesive.

In the fluid dynamic pressure bearing assembly according to another embodiment of the present invention, the outer surface of the cover portion may have a first groove along the rim of the sealing adhesive, and the first groove may be filled with a sealing adhesive.

In the fluid dynamic pressure bearing assembly according to another embodiment of the present invention, the outer surface of the cover portion may have a second groove along the rim of the sealing adhesive, and the second groove may be filled with a sealing adhesive.

In the fluid dynamic pressure bearing assembly according to an embodiment of the present invention, upper and lower radial dynamic pressure grooves may be formed on the outer surface of the shaft or the inner surface of the sleeve so as to form fluid dynamic pressure when the shaft is rotated.

The fluid dynamic pressure bearing assembly according to an embodiment of the present invention may include a circulation hole provided between the sleeve and the housing to communicate the lower portion of the sleeve with the upper portion of the housing.

A spindle motor according to an embodiment of the present invention includes a hydrodynamic bearing assembly according to an embodiment of the present invention; A rotor hub fixedly mounted on an axial upper end portion of the shaft; And a stator having a core coupled to an outer side of the housing and wound with a coil for generating a rotational driving force.

According to an embodiment of the present invention, there is provided a method of applying a sealing adhesive, comprising: forming a groove on an outer surface of a cover; Applying a sealing adhesive to a radially inner side of the groove; Rotating the housing circumferentially to expand the sealing adhesive to the groove; And adsorbing and drying the sealing adhesive to the housing.

By using the present invention, oil leakage can be prevented without changing the material composition ratio and thickness of the metal parts.

In addition, by using the present invention, metal parts can be protected from scratches, impacts, and the like that can act on the outer surface of the metal part.

1 is a schematic sectional view showing a spindle motor according to an embodiment of the present invention.
Fig. 2 (a) is an enlarged view showing part A of Fig.
Fig. 2 (b) is an enlarged view showing part B1 of Fig. 2 (a).
3 (a) is a schematic cross-sectional view showing a spindle motor according to another embodiment of the present invention.
Fig. 3 (b) is an enlarged view showing part B2 of Fig. 3 (a).
4 (a) is a schematic cross-sectional view illustrating a spindle motor according to another embodiment of the present invention.
Fig. 4 (b) is an enlarged view showing part B3 in Fig. 4 (a).
5 (a) is a schematic cross-sectional view showing a spindle motor according to another embodiment of the present invention.
Fig. 5 (b) is an enlarged view showing part B4 in Fig. 5 (a).
6 (a) is a schematic cross-sectional view showing a state in which a sealing adhesive is provided to a housing according to an embodiment of the present invention.
6 (b) is a schematic cross-sectional view showing a state in which a sealing adhesive according to an embodiment of the present invention is applied to a housing by rotation.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the following description, the same reference numerals are used to designate the same or similar parts in the same spirit of the drawings.

Fig. 1 is a schematic sectional view showing a spindle motor according to an embodiment of the present invention. Fig. 2 (a) is an enlarged view of part A in Fig. 1, to be.

Referring to FIGS. 1, 2A and 2B, a spindle motor 100 according to an embodiment of the present invention includes a base member 110, a shaft 120, a sleeve 130, A rotor hub 140, a rotor hub 150, and a stopper 160.

The spindle motor 100 may be a motor employed in a recording disk drive for driving a recording disk.

1, the axis direction means a direction from the upper portion to the lower portion, that is, from the lower portion to the upper portion of the shaft 120, or from the upper portion to the lower portion of the shaft 120, 1, that is, the direction toward the outer circumferential surface of the rotor hub 150. As shown in Fig.

The circumferential direction means a circumferential direction of a circle having a predetermined radius centering on the rotation axis. For example, the circumferential direction may mean a direction that is rotated along the outer circumferential surface of the rotor hub 150 or the shaft 120.

In addition, in the present invention, the hydrodynamic bearing assembly includes a member related to the principle of the bearing utilizing the dynamic pressure of the fluid, and may include a member other than the base member 110. That is, the structure may include the shaft 120, the sleeve 130, the housing 140, the rotor hub 150, and the stopper 160.

The base member 110 constitutes a stator 20 as a fixing member. Here, the stator 20 refers to all the fixing members except for the rotating member, and may include the base member 110, the sleeve 130, the housing 140, and the like.

The base member 110 may include a mounting portion 112 into which the housing 140 is inserted. The mounting portion 112 may protrude upwardly in the axial direction, and a mounting hole (not shown) may be formed in the mounting portion 112 so that the housing 140 can be inserted into the mounting portion 112.

The seating surface 112b may be formed on the outer circumferential surface of the mounting portion 112 so that the stator core 104 to which the coil 102 is wound can be seated. That is, the stator core 104 may be fixed to the outer circumferential surface of the mounting portion 112 by an adhesive in a state of being mounted on the seating surface 112b.

However, the stator core 104 may be press-fitted into the outer circumferential surface of the mounting portion 112 without using an adhesive. That is, the manner of mounting the stator core 104 is not limited to a method using an adhesive.

Also, the base member 110 may be made of aluminum (Al) by die-casting. Then, the steel sheet may be formed into the base member 110 by plastic working (e.g., press working). That is, the base member 110 can be manufactured by various materials and various processing methods, and is not limited to the base member 110 shown in the drawings.

The shaft 120 constitutes a rotor 40 as a rotating member. Here, the rotor 40 means a member rotatably supported by the stator 20 and rotated. Meanwhile, the shaft 120 can be rotatably supported by the sleeve 130.

Upper and lower radial dynamic pressure grooves (not shown) may be formed on the outer circumferential surface of the shaft 120 to form hydrodynamic pressure when the shaft 120 rotates. In the drawing, upper and lower radial dynamic pressure grooves 133 and 134 are formed on the inner surface of the sleeve 130 for convenience. The grooved upper and lower radial dynamic pressure grooves may be spaced apart by a predetermined distance, and may have a herringbone, a spiral, a thread shape, or the like.

A stopper 160 may be provided at a lower end of the shaft 120 to limit the excessive portion of the shaft 120 by being engaged with a lower end of the sleeve 130. That is, the shaft 120 protrudes radially outward from the lower end of the shaft 120 and is positioned below the sleeve 130, thereby limiting an excessive portion of the rotating member including the shaft 120 during operation of the motor.

The sleeve 130 is a stationary member constituting the stator 20 together with the housing 140 and the base member 110. The sleeve 130 rotatably supports the shaft 120 and forms a bearing gap C filled with the lubricant do. The sleeve 130 may be formed by sintering a Cu-Fe alloy powder or an SUS powder.

It is to be understood that the present invention is not limited to the sintering method, but may be manufactured by other methods.

The sleeve 130 may be fixed to the base member 110 by being inserted into the mounting portion 112 of the base member 110 while being fixed to the inside of the housing 140.

That is, the outer circumferential surface of the housing 140 may be bonded to the inner circumferential surface of the mounting portion 112 by an adhesive or the like.

In addition, a shaft hole (not shown) in which the shaft 120 is inserted may be formed in the sleeve 130. When the shaft 120 is inserted into the shaft hole (not shown) of the sleeve 130, the inner circumferential surface of the sleeve 130 and the outer circumferential surface of the shaft 120 are spaced apart from each other by a predetermined distance to form a bearing gap C .

As described above, the sleeve 130 forms a bearing gap C filled with a lubricant. The bearing gap C is formed between the shaft 120 and the sleeve 130 A gap formed by the upper end of the sleeve 130 and the rotor hub 150, a gap formed by the housing 140 and the stopper member 160, a gap formed by the sleeve 130 and the extending wall portion 152 and the gap formed by the cover member 170 and the bottom surface of the shaft 120. [

The spindle motor 100 according to the present embodiment adopts a structure in which the lubricant is filled in the entire bearing clearance C, and this structure is also referred to as a full-fill structure.

Upper and lower radial dynamic pressure grooves 133 and 134 may be formed on the inner surface of the sleeve 130 to form fluid dynamic pressure when the shaft 120 rotates. The upper and lower radial dynamic pressure grooves 133 and 134 may be spaced apart from each other by a predetermined distance, and may have a herringbone, a spiral, a thread shape, or the like.

A thrust dynamic pressure groove 135 may be formed on the axial upper surface of the sleeve 130 to form fluid dynamic pressure when the rotor hub 150 is rotated. The thrust dynamic pressure groove 135 may have a herringbone, a spiral, a thread shape, or the like.

In addition, the sleeve 130 may have a circulation hole 180 between the inner surface of the housing 140 to be described later. The circulation hole 180 may extend from the bottom surface of the sleeve 120 toward the axial direction.

A connection part 190 connected to the circulation hole 180 may be formed between the sleeve 130 and the housing 140. The connecting portion 190 is formed by the outer surface of the housing 140 and the inner surface of the extending wall portion 152 of the rotor hub 150 and has a sealing portion 106 in which the gas-liquid interface F1 is disposed and a circulation hole 180 And to communicate with each other.

That is, the sleeve 130 may have a flange portion 136 protruding radially outward in the axial direction.

The housing 140 may include an outer circumferential portion 141 surrounding at least a part of the radial surface of the sleeve 130 and a cover portion 142 surrounding the axially lower portion.

That is, the housing 140 may be coupled to the outer circumferential surface of the sleeve 130 in a shape that surrounds the sleeve 130. Strictly, the sleeve 130 may be inserted into the inner circumferential surface of the housing 140 and joined by press-fitting or bonding. Of course, since the upper end of the sleeve 130 should be provided in an exposed state, the housing 140 may be coupled except for a part of the outer surface of the upper end of the sleeve 130.

The housing 140 may be coupled to the outer circumferential surface of the sleeve 130 to prevent oil leakage.

The outer surface of the upper end of the housing 140 may form a gas-liquid interface F1 between the oil and the air between the outer wall of the upper end portion of the housing 140 and the extending wall 152 protruding downward in the axial direction from the rotor hub 150. In other words, the bearing gap C is filled with oil, and the filled oil is sealed by the capillary phenomenon. In this embodiment, the sealing portion 106 of the fluid is formed on the outer surface of the housing 140 and the extending wall portion 152). ≪ / RTI > Of course, the position of the oil interface may change depending on the operation and non-operation of the motor.

The outer surface of the upper end of the housing 140 or the inner surface of the extending wall 152 may be tapered to facilitate oil sealing. That is, the outer surface of the upper end portion of the housing 140 or the inner surface of the extending wall portion 152 may be inclined so that the interface between the lubricant and the air can be easily formed.

In addition, the inner surface of the cover portion 142 is formed to be inserted into the lower portion in the axial direction, thereby providing a space in which the stopper 160 can be positioned. In addition, the gap between the shaft 120 and the housing 140 Thereby making it possible to accommodate a larger amount of lubricant.

A sealing adhesive 200 for preventing the leakage of the lubricant may be applied to the outer surface of the cover portion 142, and the sealing adhesive may be an epoxy or acrylic adhesive.

In detail, the cover 142 may be formed by sintering a Cu-Fe alloy powder or an SUS powder, and there is a possibility that scratches or inclusions may occur during the processing of the metal material. When such scratches or inclusions are generated, a leakage phenomenon may occur at the interface between the cover portion 142 and the lubricant. Thus, the sealing adhesive 200 may be applied to the outer surface of the cover portion 142 to prevent leakage.

In addition, the cover portion 142 can be protected from scratches, impacts, and the like due to an external impact by an adhesive applied on the outer surface.

The rotor hub 150 is a rotating member that constitutes the rotor 40 together with the shaft 120. The rotor hub 150 includes an extended wall portion 152 coupled to the upper end of the shaft 120 and extended to be disposed on the outer side of the sleeve 130, .

The rotor hub 150 includes a rotor hub body 154 formed with a mounting hole (not shown) into which the upper end of the shaft 120 is inserted, and a rotor hub body 154 extending downwardly in the axial direction from the edge of the rotor hub body 154 And a disk seating portion 158 extending radially outward from the ends of the magnet mounting portion 156 and the magnet mounting portion 156. [

A driving magnet 156a is provided on the inner surface of the magnet mounting portion 156 and the driving magnet 156a is disposed opposite to the front end of the stator core 104 where the coil 102 is wound.

Meanwhile, the driving magnet 156a may have a ring-like shape, and may be a permanent magnet that magnetizes N and S poles alternately along the circumferential direction to generate a magnetic force of a constant intensity.

When the power is supplied to the coil 102 wound around the stator core 104, the driving magnet 156a and the stator core 102 wound with the coil 102 104 to generate a driving force by which the rotor hub 150 can be rotated.

Thus, the rotor hub 150 is rotated. The shaft 120 to which the rotor hub 150 is fixed by the rotation of the rotor hub 150 can be rotated in conjunction with the rotor hub 150.

The extending wall 152 may extend downward from the bottom of the rotor hub body 154 in the axial direction.

A portion of the extension wall portion 152 may be disposed on the outer side of the upper end portion of the sleeve 130 and a portion of the extension wall portion 152 may be disposed on the outer side of the housing 140. That is, since the upper end of the sleeve 130 protrudes to the upper end of the housing 140, the lubricant can be filled in the bearing clearance C formed by facing the extending wall 152 directly.

Meanwhile, the rotor hub 150 may be integrally formed with the shaft 120.

A thrust dynamic pressure groove 135 for generating thrust fluid dynamic pressure may be formed on at least one of the upper surface of the sleeve 130 and the lower surface of the rotor hub body 154 facing the upper surface of the sleeve 130 .

Accordingly, when the shaft 120 rotates, thrust fluid dynamic pressure can be generated to more stably support the rotation of the rotor hub 150.

Hereinafter, a fluid dynamic pressure bearing assembly according to another embodiment of the present invention will be described with reference to the drawings. However, the same elements as those described above will not be described in detail, and the description will be omitted.

3 (a) is a schematic cross-sectional view of a spindle motor according to another embodiment of the present invention, and Fig. 3 (b) is an enlarged view of a portion b2 in Fig.

3 (a) and 3 (b), the hydrodynamic bearing assembly according to another embodiment of the present invention may include a sleeve 130 and a housing 140 as an example.

That is, the fluid-dynamic bearing assembly according to an embodiment of the present invention shown in FIGS. 1 and 2 is different from the fluid-dynamic bearing assembly of FIG. 1 and FIG. 2 in that only the housing 140 is differentiated.

The housing 140 includes an outer circumferential portion 141 surrounding at least a part of the radial surface of the sleeve 130 and a cover portion 142 surrounding the axially lower portion of the sleeve 140. The cover portion 142 The outer surface may be drawn in the upper axial direction, and the drawn portion may be filled with the sealing adhesive 200.

That is, the inner surface 142 (a) of the outer surface of the cover portion 142 may be stepped with the outer surface. Therefore, when the sealing adhesive 200 is applied to the outer surface of the cover portion 142, the sealing adhesive 200 can be prevented from moving to the outside of the cover portion 142 due to the centrifugal force.

4 (a) is a schematic sectional view of a spindle motor according to another embodiment of the present invention, and Fig. 4 (b) is an enlarged view of a portion B3 in Fig.

Referring to FIGS. 4 (a) and 4 (b), the hydrodynamic bearing assembly according to another embodiment of the present invention may include a sleeve 130 and a housing 140 as an example.

That is, the fluid-dynamic bearing assembly according to an embodiment of the present invention shown in FIGS. 1 and 2 is different from the fluid-dynamic bearing assembly of FIG. 1 and FIG. 2 in that only the housing 140 is differentiated.

The housing 140 may include an outer circumferential portion 141 surrounding at least a part of the radial surfaces of the sleeve 130 and a cover portion 142 surrounding the axially lower portion of the sleeve 130, 142 may have an outer surface formed with a first groove along the edge of the sealing adhesive, and the first groove may be filled with a sealing adhesive.

Therefore, even when the amount of the adhesive is greater than the standard amount when the sealing adhesive 200 is applied, the excess adhesive can be accommodated in the recess 142 (b), so that the sealing adhesive 200 moves Can be prevented.

FIG. 5A is a schematic sectional view of a spindle motor according to another embodiment of the present invention, and FIG. 5B is an enlarged view of a portion B4 in FIG. 5A.

5 (a) and 5 (b), the hydrodynamic bearing assembly according to another embodiment of the present invention may include a sleeve 130 and a housing 140 as an example.

That is, the fluid-dynamic bearing assembly according to an embodiment of the present invention shown in FIGS. 1 and 2 is different from the fluid-dynamic bearing assembly of FIG. 1 and FIG. 2 in that only the housing 140 is differentiated.

The housing 140 may include an outer circumferential portion 141 surrounding at least a part of the radial surfaces of the sleeve 130 and a cover portion 142 surrounding the axially lower portion of the sleeve 130, 142) is drawn axially upward, the drawn portion can be filled with the sealing adhesive (200), a second groove (142 (c)) is formed along the edge of the sealing adhesive, and the second The groove 142 (c) may also be filled with the sealing adhesive 200.

That is, according to another embodiment of the present invention, the inner surface 142a of the cover portion 142 is stepped with the outer surface, and the second groove 142 (c) is formed along the outer surface of the cover portion 142, It is possible to form a sufficient space for applying the sealing adhesive 200 and to prevent the sealing adhesive 200 from moving to the outside of the cover portion 142 due to the centrifugal force upon application of the sealing adhesive 200 It can be easily prevented.

6 (a) is a schematic cross-sectional view illustrating a state in which a sealing adhesive is provided to a housing according to an embodiment of the present invention, and FIG. 6 (b) Fig. 2 is a schematic cross-sectional view showing a state in which the film is applied to the substrate.

6A and 6B, a method of applying a sealing adhesive according to an embodiment of the present invention includes the steps of forming a groove 143 along a rim of an outer surface of a cover portion 142; Rotating the housing (140) such that an outer surface of the cover portion (142) faces an upper axial direction; Applying a sealing adhesive (200) radially inward of the groove (143); Extending the sealing adhesive (200) to the groove (143) by rotating the housing (140); And adsorbing and drying the sealing adhesive 200 to the housing 140.

The groove 143 may be formed by mechanical finishing such as cutting the cover 142 and may be manufactured at the same time when the housing 140 is manufactured. In addition, it is noted that the method of manufacturing the groove 143 may vary and is not limited to the above-described method.

The sealing adhesive 200 may be provided on the outer surface of the cover part 142 at a predetermined amount and may be provided at the center of the outer surface of the cover part 142 for ease of application.

When the sealing adhesive 200 is provided, the sealing adhesive 200 can be applied by centrifugal force by rotating the housing 140.

That is, by rotating the housing 140, the sealing adhesive 200 can be uniformly applied to the outer surface of the cover portion 142, and even when the amount of the adhesive exceeds the reference amount, So that the sealing adhesive 200 may not move to the outside of the cover portion 142.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that changes or modifications may fall within the scope of the appended claims.

100: Spindle motor
110: Base member
120: shaft
130: Sleeve
140: housing
141: outer peripheral portion 142: cover portion
150: Rotor hub
160: Stopper
200: Adhesive

Claims (9)

A sleeve supporting the shaft such that an upper end of the shaft protrudes upward in the axial direction and forming a bearing gap between the shaft and the lubricant, And
And a housing having an outer peripheral portion surrounding at least a part of the radial surfaces of the sleeve and a cover portion surrounding the axial lower portion,
And a sealing adhesive for preventing leakage of the lubricant is applied to the outer surface of the cover portion.
The method according to claim 1,
And the inner surface of the cover portion is configured to be pulled down axially.
The method according to claim 1,
Wherein an outer surface of the cover portion is drawn axially upward and the drawn portion is filled with the sealing adhesive.
The method according to claim 1,
Wherein an outer surface of the cover portion is formed with a first groove along a rim of the sealing adhesive, and the first groove is filled with a sealing adhesive.
The method of claim 3,
Wherein an outer surface of the cover portion is formed with a second groove along a rim of the sealing adhesive, and the second groove is filled with a sealing adhesive.
The method according to claim 1,
Wherein an upper or lower radial dynamic pressure groove is formed on an outer surface of the shaft or an inner surface of the sleeve to form fluid dynamic pressure during rotation of the shaft.
The method according to claim 1,
A circulation hole provided between the sleeve and the housing to communicate the lower portion of the sleeve with the upper portion of the housing; Lt; / RTI >
A hydrodynamic bearing assembly as claimed in any one of claims 1 to 7;
A rotor hub fixedly mounted on an axial upper end portion of the shaft; And
And a stator coupled to the outer side of the housing, the stator having a core wound with a coil for generating a rotational driving force.
Forming a groove on an outer surface of the cover portion;
Applying a sealing adhesive to a radially inner side of the groove;
Rotating the housing circumferentially to expand the sealing adhesive to the groove; And
And adsorbing and drying the sealing adhesive to the housing.


KR20130082201A 2013-07-12 2013-07-12 Hydrodynamic bearing assembly and motor including the same KR20150008296A (en)

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KR20130082201A KR20150008296A (en) 2013-07-12 2013-07-12 Hydrodynamic bearing assembly and motor including the same

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Application Number Priority Date Filing Date Title
KR20130082201A KR20150008296A (en) 2013-07-12 2013-07-12 Hydrodynamic bearing assembly and motor including the same

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