KR20130008252A - Hydro-dynamic bearing assembly and spindle motor having the same - Google Patents

Hydro-dynamic bearing assembly and spindle motor having the same Download PDF

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Publication number
KR20130008252A
KR20130008252A KR1020110068879A KR20110068879A KR20130008252A KR 20130008252 A KR20130008252 A KR 20130008252A KR 1020110068879 A KR1020110068879 A KR 1020110068879A KR 20110068879 A KR20110068879 A KR 20110068879A KR 20130008252 A KR20130008252 A KR 20130008252A
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KR
South Korea
Prior art keywords
shaft
thrust plate
groove
bearing assembly
joint surface
Prior art date
Application number
KR1020110068879A
Other languages
Korean (ko)
Inventor
정현식
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 KR1020110068879A priority Critical patent/KR20130008252A/en
Publication of KR20130008252A publication Critical patent/KR20130008252A/en

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Classifications

    • 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
    • F16C17/107—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure with at least one surface for radial load and at least one surface for axial load
    • 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
    • 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
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • 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
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • 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)

Abstract

The fluid dynamic bearing assembly of the present invention comprises a shaft; And a thrust plate coupled to the shaft, wherein the shaft or the thrust plate may be filled with an adhesive filling space such that an adhesive for joining the shaft and the thrust plate may be filled.

Description

Hydro-dynamic bearing assembly and spindle motor having the same}

The present invention relates to a fluid dynamic bearing assembly and a spindle motor, and more particularly, to a fluid dynamic bearing assembly and a spindle motor with increased coupling force between the shaft and the thrust plate.

The spindle motor for HDD rotates at high speed. Therefore, vibration may occur in the shaft and the thrust plate of the rotating body, and cracks or gaps may occur in the bonding portion (or the joint surface) of the shaft and the thrust plate.

These gaps become the outflow passages of the fluid generating dynamic pressure on the shaft and the thrust plate, thus causing a problem that the leakage of the fluid and the function of the dynamic fluid bearing significantly degrades.

In recent years, in order to solve such a problem, the method of filling a bonding agent in the joint surface of a shaft and thrust plate was proposed. However, since the coupling portion between the shaft and the thrust plate is in contact with the surface, it is difficult to secure a space for filling the sufficient adhesive between the shaft and the thrust plate.

Accordingly, there is a strong demand for the development of a fluid dynamic bearing assembly or spindle motor having a structure capable of filling a sufficient adhesive to the joint surface between the shaft and the thrust plate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a fluid dynamic bearing assembly and a spindle motor capable of improving the bonding force between the shaft and the thrust plate by forming an adhesive filling space between the shaft and the thrust plate. .

Fluid dynamic bearing assembly according to an embodiment of the present invention for achieving the above object is a shaft; And a thrust plate coupled to the shaft, wherein the shaft or the thrust plate may be filled with an adhesive filling space such that an adhesive for joining the shaft and the thrust plate may be filled.

In the adhesive filling space of the hydrodynamic bearing according to an embodiment of the present invention, the adhesive filling space may be formed in a groove shape on the thrust plate.

The thrust plate of the hydrodynamic bearing according to an embodiment of the present invention may include a protrusion protruding toward the shaft, and the shaft may include a groove corresponding to the protrusion.

In the hydrodynamic bearing according to an embodiment of the present invention, the volume of the groove may be larger than the volume of the protrusion so that the adhesive filling space is formed between the groove and the protrusion fitted to the groove.

The hydrodynamic bearing according to an embodiment of the present invention may be curved so that the joining surface of the thrust plate may be in line contact with the joining surface of the shaft.

The shaft of the hydrodynamic bearing according to an embodiment of the present invention may include a step for supporting the thrust plate.

Adhesive filling space of the hydrodynamic bearing according to an embodiment of the present invention may be formed by a plurality of fine grooves formed in the joint surface of the shaft or the joint surface of the thrust plate.

In the hydrodynamic bearing according to an embodiment of the present invention, a plurality of first fine grooves and second fine grooves are formed on the joint surface of the shaft and the thrust plate, and the first fine groove and the second fine groove are formed. May be arranged to be offset from each other.

Spindle motor according to an embodiment of the present invention for achieving the above object includes a shaft, a thrust plate coupled to the shaft, the shaft or the thrust plate is filled with an adhesive for coupling the shaft and the thrust plate And a fluid dynamic bearing assembly in which an adhesive filling space is formed.

The present invention provides a space for the adhesive to be filled in the joint surface of the shaft and the thrust plate, it is possible to improve the coupling force of the shaft and the thrust plate.

Therefore, according to the present invention, it is possible to effectively prevent and suppress separation between the shaft and the thrust plate due to the high speed rotation of the shaft in the spindle motor and the leakage of the fluid.

1 is a cross-sectional view of a fluid dynamic bearing assembly according to a first embodiment of the present invention,
2 is a cross-sectional view of a fluid dynamic bearing assembly according to a second embodiment of the present invention;
3 and 4 are cross-sectional views of a fluid dynamic bearing assembly according to a third embodiment of the present invention,
5 to 7 are cross-sectional views of a fluid dynamic bearing assembly according to a fourth embodiment of the present invention,
8 is a cross-sectional view of a spindle motor including a hydrodynamic bearing assembly according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, terms that refer to the components of the present invention are named in consideration of the function of each component, it should not be understood as a meaning limiting the technical components of the present invention.

1 is a cross-sectional view of a fluid dynamic bearing assembly according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a fluid dynamic bearing assembly according to a second embodiment of the present invention, and FIGS. 3 is a cross-sectional view of the fluid dynamic bearing assembly according to the third embodiment, and FIGS. 5 to 7 are cross-sectional views of the fluid dynamic bearing assembly according to the fourth embodiment of the present invention.

(Embodiment 1)

A fluid dynamic bearing assembly according to a first embodiment of the present invention will be described with reference to FIG. 1. For reference, configurations having low relevance to the features of the present invention in the configuration of the hydrodynamic bearing assembly are the same as those of the conventional hydrodynamic bearing assembly, and thus detailed description thereof will be omitted.

The hydrodynamic bearing assembly 100 according to the first embodiment may include a shaft 110 and a thrust plate 120.

The shaft 110 is a member forming a rotation center in the fluid dynamic bearing assembly 100, and may be rotatably installed in the sleeve 150. The shaft 110 may include a first body 110a into which the thrust plate 120 is fitted and a second body 110b into which the sleeve 150 (see FIG. 8) is fitted. The first body 110a may have a diameter of D1, and the second body 110b may have a diameter of D2. Here, the diameter D1 may be smaller than the diameter D2. In this case, as illustrated in FIG. 1, a stepped portion 114 may be formed at a boundary between the first body 110a and the second body 110b to support a coupling position of the thrust plate 120. Here, the joint surface 112 of the shaft to be joined to the thrust plate 120 may be formed on the outer surface of the first body (110a), the fluid dynamic pressure for generating a fluid dynamic pressure on the outer surface of the second body (110b) Grooves may be formed. The fluid dynamic groove may be one of a herringbone shape, a spiral shape, and a screw shape, and may be any shape as long as it generates a dynamic pressure.

Thrust plate 120 may be coupled to one end of the shaft 110 in the form of bonding or suppression fitting. To this end, the thrust plate 120 may have a coupling hole for the shaft 110 is fitted. The coupling hole may have a diameter D1 having a size D3, and the diameter D3 may be larger than the diameter D1 of the first body 110a. The inner wall of the coupling hole may form the joining surface 122 of the thrust plate 120. On the other hand, the thrust plate 120 may be made of a non-metallic material such as ceramic in order to minimize the wear phenomenon due to the high speed rotation.

As such, since the thrust plate 120 made of a non-metallic material such as ceramic is hardly fixed to the shaft 110 by welding or the like, the thrust plate 120 may be coupled to the shaft 110 by an adhesive. In this case, in order to ensure a firm coupling force between the shaft 110 and the thrust plate 120, it is necessary to form a space in which the adhesive surfaces can be filled on the joint surfaces 112 and 122 of the shaft 110 and the thrust plate 120. There is.

In this embodiment, the groove 124 may be formed in the joint surface 122 of the thrust plate 120. The groove 124 forms an adhesive filling space 130 through which the adhesive 140 can be injected between the joint surface 112 of the shaft 110 and the joint surface 122 of the thrust plate 120. Coupling force between the 110 and the thrust plate 120 can be improved.

Meanwhile, in FIG. 1, the groove 124 is shown to be formed only on the upper side (in the reference direction of FIG. 1) in the bonding surface 122 of the thrust plate 120, but is formed below the bonding surface 122 or It may be formed both above and below the bonding surface 122.

Next, other embodiments of the present invention will be described. For reference, in the following embodiments, the same components as those of the first embodiment have the same reference numerals, and detailed description of these components will be omitted.

(Second Embodiment)

A second embodiment of the present invention will be described with reference to FIG. 2.

In the hydrodynamic bearing assembly 100 according to the second embodiment, grooves 116 and 117 may be further formed on the joint surface 112 of the shaft 110, and the joint surface 122 of the thrust plate 120 may be formed. The protrusion 126 may be different from the first embodiment in that it may be further formed.

In the shaft 110 of the present embodiment, a plurality of grooves 116 and 117 may be formed in the joint surface 112. The groove 116 may be formed at a position corresponding to the groove 124 of the thrust plate 120, and the groove 117 may be formed at a position corresponding to the protrusion 126 of the thrust plate 120. have. Here, the volume of the space formed by the groove 117 may be larger than the volume of the protrusion formed by the protrusion 126. In this case, although the protrusion 126 is inserted into the groove 117, the adhesive filling space 130 through which the adhesive 140 may be injected between the protrusion 126 and the groove 117 is shown in FIG. 2. Can be formed.

The thrust plate 120 may further include a protrusion 126 on the joint surface 122. The protrusion 126 may be inserted into the groove 117 of the shaft 110 by a force fitting method, thereby improving the coupling force between the shaft 110 and the thrust plate 120.

In this embodiment, the adhesive filling space 130 is sufficiently formed by the grooves 116, 117, and 124 between the shaft 110 and the thrust plate 120, and the protrusion 126 is inserted into the groove 117. Since losing structure, the coupling force between the shaft 110 and the thrust plate 120 can be further improved.

(Third Embodiment)

A third embodiment of the present invention will be described with reference to FIGS. 3 and 4.

The hydrodynamic bearing assembly 100 according to the third embodiment may have a difference from the above-described embodiments in that the joint surface 122 of the thrust plate 120 may be curved.

In the thrust plate 120 according to the present embodiment, the bonding surface 122 may be a curved surface. As shown in FIGS. 3 and 4, the joining surface 122 may form a structure in which the joining surface 122 is in line contact with the joining surface 112 of the shaft 110 without being in surface contact. The adhesive filling space 130 may be naturally formed between the bonding surfaces 112 and 122 of the plate 120. For reference, although the entire bonding surface 122 is illustrated as being curved in FIG. 3, a portion of the bonding surface 122 may be a curved surface.

A groove 116 may be formed in the joint surface 112 of the shaft 110, as shown in FIG. 4, and a portion of the curved joint surface 122 is inserted into the groove 116 by an interference fit method. Can lose.

This embodiment is relatively wide between the shaft 110 and the joint surfaces 112 and 122 of the thrust plate 120 along the longitudinal direction of the shaft 110 (up and down with reference to FIGS. 3 and 4). Since the adhesive filling space 130 is formed, the bonding force by the adhesive 140 may be evenly distributed on the bonding surfaces 112 and 122.

(Fourth Embodiment)

A fourth embodiment of the present invention will be described with reference to FIGS. 5 to 7.

The fluid dynamic bearing assembly 100 according to the fourth embodiment may have a difference from the above-described embodiments in that fine grooves 118 and 128 may be formed in the shaft 110 or the thrust plate 120.

The fluid dynamic bearing assembly 100 according to the present exemplary embodiment may include a plurality of first fine grooves 118 on the joint surface 112 of the shaft 110 as shown in FIG. 5. The first fine groove 118 may be smaller than the grooves 116 and 117 of the above-described embodiment. For example, the first fine groove 118 may be a groove having a small width W of 2 mm or less.

As such, when the plurality of first fine grooves 118 are formed on the joint surface 112 of the shaft 110, the joint surface 112 of the shaft 110 and the joint surface 122 of the thrust plate 120 are surfaced. Sufficient adhesive filling space 130 can be formed between these bonding surfaces 112, 122 while in contact.

6 may be modified to a structure in which a second fine groove 128 is formed on the joint surface 122 of the thrust plate 120. In addition, the present embodiment may be modified to a structure in which fine grooves 118 and 128 are formed in both the shaft 110 and the slot plate 120 as shown in FIG. 7. The former variant is relatively easy to mechanically machine the shaft 110 than the structure shown in Figure 5, the latter variant can maximize the coupling force between the shaft 110 and the thrust plate 120.

Meanwhile, in the modified example shown in FIG. 7, the first fine groove 118 and the second fine groove 128 may be formed to be offset from each other as shown in FIG. 7. In this structure, the adhesive 140 may be uniformly injected between the joint surface 112 of the shaft 110 and the joint surface 122 of the thrust plate 120.

For reference, in FIG. 7, the first fine groove 118 and the second fine groove 128 are formed so as not to overlap each other, but may be partially overlapped as necessary.

Next, the spindle motor 200 including the hydrodynamic bearing assembly 100 according to the above-described embodiments will be described. 8 is a cross-sectional view of a spindle motor including a hydrodynamic bearing assembly according to an embodiment of the present invention.

The spindle motor 200 may include a fluid dynamic bearing assembly 100, a base member 210, a hub 220, an electromagnet 230, and a permanent magnet 240.

The base member 210 may have a first circumferential wall portion 212. The first circumferential wall 212 may extend upwardly (in the reference direction of FIG. 8) along the outer surface of the sleeve 150, thereby firmly fixing the sleeve 150 to the base member 210. For reference, the extension length of the first circumferential wall 212 may be changed according to the size of the sleeve 150.

Hub 220 may be coupled to shaft 110 and may rotate with shaft 110. The hub 220 may have a second circumferential wall portion 222. The second circumferential wall portion 222 may extend along the outer surface of the shaft 110 in the longitudinal direction (downward with reference to FIG. 8) of the shaft 110. In addition, the hub 220 may have a third circumferential wall portion 224. The third circumferential wall part 224 may extend in a form surrounding the circumference (that is, the circumferential surface) of the sleeve 150.

The electromagnet 230 may be installed on the first circumferential wall portion 212 of the base member 210. The electromagnet 230 may be circularly disposed around the sleeve 150 and may receive an electric current from the outside to generate an electric field and a magnetic field. Electromagnet 230 is not shown, but may include a core and a coil.

The permanent magnet 240 may be installed on the third circumferential wall portion 224 of the hub 220. The permanent magnet 240 may be installed on the inner wall surface of the third circumferential wall 224, and may generate a magnetic field corresponding to the electromagnet 230. The permanent magnet 240 may be circularly disposed at a predetermined interval on the third circumferential wall 224 to cause proper interaction with the electromagnet 230.

Since the spindle motor 200 configured as described above retains the characteristics of the hydrodynamic bearing assembly 100 described above, the coupling force between the shaft 110 and the thrust plate 120 may be firmly maintained even during the high speed rotation of the shaft 110. Can be.

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 inventions And various modifications may be made.

100 fluid dynamic bearing assembly
110 shaft 112 (axial) joint surface
114 step 116 groove
118 First Fine Home
120 thrust plate 122 (of thrust plate)
124 groove 126 turning
128 2nd Fine Home
130 glue filling space 140 glue
150 sleeve
200 spindle motor 210 base member
220 hub 230 electromagnet
240 Permanent Magnet

Claims (9)

shaft; And
A thrust plate engaging with the shaft;
Including,
And an adhesive filling space so that the shaft or the thrust plate is filled with an adhesive that couples the shaft and the thrust plate.
The method of claim 1,
And the adhesive filling space is formed in a groove shape in the thrust plate.
The method of claim 1,
The thrust plate comprises a protrusion projecting toward the axis,
And the shaft includes a groove corresponding to the protrusion.
The method of claim 3,
And the volume of the groove is larger than the volume of the protrusion so that the adhesive filling space can be formed between the groove and the protrusion fitted into the groove.
The method of claim 1,
And the mating surface of the thrust plate is curved to be in line contact with the mating surface of the shaft.
The method of claim 1,
And the shaft comprises a step for supporting the thrust plate.
The method of claim 1,
And the adhesive filling space is formed by a plurality of fine grooves formed in the joint surface of the shaft or the joint surface of the thrust plate.
The method of claim 7, wherein
A plurality of first fine grooves and second fine grooves are formed on the joint surface of the shaft and the joint surface of the thrust plate,
And the first fine groove and the second fine groove are disposed to be offset from each other.
A spindle motor comprising any one of the fluid dynamic bearings as claimed in claim 1.
KR1020110068879A 2011-07-12 2011-07-12 Hydro-dynamic bearing assembly and spindle motor having the same KR20130008252A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110068879A KR20130008252A (en) 2011-07-12 2011-07-12 Hydro-dynamic bearing assembly and spindle motor having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110068879A KR20130008252A (en) 2011-07-12 2011-07-12 Hydro-dynamic bearing assembly and spindle motor having the same

Publications (1)

Publication Number Publication Date
KR20130008252A true KR20130008252A (en) 2013-01-22

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KR1020110068879A KR20130008252A (en) 2011-07-12 2011-07-12 Hydro-dynamic bearing assembly and spindle motor having the same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102444502B1 (en) * 2022-04-06 2022-09-19 (주)동일전자 Rotor assembly to prevent malfunction of motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102444502B1 (en) * 2022-04-06 2022-09-19 (주)동일전자 Rotor assembly to prevent malfunction of motor

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