KR20140015774A - 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
KR20140015774A
KR20140015774A KR1020120080761A KR20120080761A KR20140015774A KR 20140015774 A KR20140015774 A KR 20140015774A KR 1020120080761 A KR1020120080761 A KR 1020120080761A KR 20120080761 A KR20120080761 A KR 20120080761A KR 20140015774 A KR20140015774 A KR 20140015774A
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KR
South Korea
Prior art keywords
sleeve
circumferential surface
bearing assembly
sleeve housing
shaft
Prior art date
Application number
KR1020120080761A
Other languages
Korean (ko)
Inventor
한훈희
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 KR1020120080761A priority Critical patent/KR20140015774A/en
Publication of KR20140015774A publication Critical patent/KR20140015774A/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
    • 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
    • F16C33/72—Sealings
    • 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
    • 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)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

A hydrodynamic bearing assembly according to an embodiment of the present invention includes: a sleeve formed with a first circulation hole which penetrates the inner and outer circumference, and which supports a shaft by a medium of lubricating fluid; a sleeve housing in which the sleeve is inserted; and a second circulation hole formed to be connected with the first circulation hole in between the sleeve and the sleeve housing.

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 fluid dynamic bearing assembly and a motor including the same. More particularly, the present invention relates to a fluid dynamic bearing assembly capable of suppressing negative pressure generation and a motor including the same.

A hard disk drive (HDD), which is one of information storage devices, is a device that reproduces data stored on a disk using a read / write head or records data on a disk.

Such a hard disk drive requires a disk drive capable of driving a disk, and a small spindle motor is used for the disk drive.

A compact spindle motor uses a fluid dynamic pressure bearing assembly in which a lubricating fluid is interposed between the shaft and the sleeve of the fluid dynamic pressure bearing assembly to support the shaft with fluid pressure generated in the lubricating fluid.

At this time, a radial bearing and a thrust bearing are formed inside the hydrodynamic bearing, and the pressure inside the hydrodynamic bearing is not uniform due to the pressure caused by the radial bearing and the thrust bearing.

Therefore, there is a concern that negative pressure may occur in the hydrodynamic bearing, which is closely related to the performance of the motor, and therefore, there is an urgent need for research to suppress the occurrence of negative pressure in the hydrodynamic bearing.

The patent document described in the following prior art document discloses a motor in which a communication hole is formed in a sleeve. However, since the thrust bearing is formed radially outward from the communication hole, bubbles inside the lubricating fluid may not be discharged by circulation. Is present.

Republic of Korea Patent Publication No. 2008-0013683

An object according to an embodiment of the present invention is to maintain the pressure inside the fluid dynamic bearing assembly uniformly, to suppress the occurrence of negative pressure, and the fluid dynamic bearing assembly capable of discharging bubbles, etc. in the lubricating fluid by circulation. And to provide a motor comprising the same.

A fluid dynamic bearing assembly according to an embodiment of the present invention includes a sleeve for supporting a shaft through a lubricating fluid and having a first circulation hole penetrating an inner circumferential surface and an outer circumferential surface; A sleeve housing into which the sleeve is inserted; And a second circulation hole formed to communicate with the first circulation hole between the sleeve and the sleeve housing. . ≪ / RTI >

A radially outwardly projecting protrusion may be formed on the upper portion of the sleeve of the hydrodynamic bearing assembly according to an embodiment of the present invention.

An axial upper end of the sleeve housing of the hydrodynamic bearing assembly according to an embodiment of the present invention may contact a portion of the lower surface of the protrusion.

A communication channel may be formed between the axial upper end of the sleeve housing and the lower surface of the protrusion of the hydrodynamic bearing assembly according to an embodiment of the present invention so that the second circulation hole communicates with the outside of the sleeve housing.

The second circulation hole of the fluid dynamic pressure bearing assembly according to an embodiment of the present invention may be formed by cutting a part of the outer circumferential surface of the sleeve.

A hydrodynamic bearing assembly according to an embodiment of the present invention includes a rotor fixed to the shaft to rotate in conjunction with the shaft; As shown in FIG.

The rotor of the fluid dynamic pressure bearing assembly according to an embodiment of the present invention may be provided with a circumferential wall protruding from one surface of the rotor so as to face the outer circumferential surface of the sleeve housing.

A sealing portion may be formed between the outer circumferential surface of the sleeve housing and the inner circumferential surface of the circumferential wall of the hydrodynamic pressure bearing assembly according to an embodiment of the present invention to seal the lubricating fluid.

The upper outer circumferential surface of the sleeve housing of the hydrodynamic bearing assembly according to an embodiment of the present invention may be tapered to seal the lubricating fluid.

A motor according to an embodiment of the present invention comprises a fluid dynamic bearing assembly according to any one of claims 1 to 9; And a stator coupled to the fluid dynamic pressure bearing assembly and having a core through which a coil for generating a rotational driving force is wound; . ≪ / RTI >

According to the fluid dynamic pressure bearing assembly and the motor including the fluid dynamic pressure bearing assembly according to the present invention, the pressure inside the fluid dynamic pressure bearing assembly can be uniformly maintained, the occurrence of negative pressure can be suppressed, and bubbles and the like in the lubricating fluid can be discharged .

1 is a schematic cross-sectional view of a motor including a hydrodynamic bearing assembly in accordance with an embodiment of the present invention.
2 is an enlarged cross-sectional view of a portion A in Fig.
3 is an assembled sectional view of a sleeve and a rotor case according to an embodiment of the present invention.
4 is an exploded perspective view of a shaft, a sleeve, a thrust plate, a sleeve housing, and a rotor case according to an embodiment of the present invention.
5 is a schematic cross-sectional view of a motor including a fluid dynamic bearing assembly according to another embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. 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 be easily suggested, but are also included within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a schematic cross-sectional view of a motor including a hydrodynamic bearing assembly according to one embodiment of the present invention.

Referring to FIG. 1, a motor 500 according to an embodiment of the present invention may include a hydrodynamic bearing assembly 100 and a stator 300.

1, the axial direction refers to the vertical direction with respect to the shaft 110, and the radially outer or inner direction refers to the direction of the rotor 200 with respect to the shaft 110, And the center of the shaft 110 is referred to as an outer end of the rotor 200 or an outer end of the rotor 200.

The hydrodynamic bearing assembly 100 may include a shaft 110, a sleeve 120, a thrust plate 130, a sleeve housing 140, and a rotor 200.

The fluid dynamic pressure bearing assembly 100 excluding the rotor 200 will be described later in detail with reference to FIG. 2 to FIG.

The stator 300 may include a coil 320, a core 330, a base member 310, and a pulling plate 340.

The stator 300 is a fixed structure including a core 330 to which a coil 320 for generating a predetermined magnitude of electromagnetic force when power is applied.

The core 330 is fixedly disposed on a base member 310 provided with a printed circuit board (not shown) on which a pattern circuit is printed, and the core 330, on which the coil 320 is wound, A plurality of coil holes of a predetermined size may be formed on the upper surface of the member 310 to expose the coil 320 downward. The coil 320 may be connected to the printed circuit board (not shown) Respectively.

The pulling plate 340 can prevent the rotating member including the shaft 110 and the rotor 200 from being overloaded with the magnet 220 coupled to the rotor 200 and a component to which attraction is applied .

The shaft 110 and the rotor 200, which are the rotating members of the motor 500 according to the present invention, must be lifted to a predetermined height for stable rotation. However, if an excessive load is generated above the designed flying height, .

In this case, the base member 310 and the pulling plate 340 may be coupled to prevent the shaft 110 and the rotor 200 from being overloaded, and the pulling plate 340, It is possible to prevent the rotating member from being overloaded by the attraction force acting between the magnets 220.

The rotor 200 is a rotating structure rotatably provided with respect to the stator 300. The rotor 200 includes a rotor 300 having a ring-shaped magnet 220 on its outer circumferential surface, (Not shown).

Here, the rotor case 210 includes a hub base 212 which is press-fitted into an upper end of the shaft 110 and which extends in the outer diameter direction from the hub base 212 and is bent downward in the axial direction, And a magnet supporting portion 214 for supporting the magnet supporting portion 214.

The magnet 220 is provided as a permanent magnet which alternately magnetizes N and S poles in a circumferential direction to generate magnetic force of a predetermined intensity.

Looking briefly about the rotational drive of the rotor 200, when power is supplied to the coil 320 wound on the core 330, the magnet 220 and the core 330 wound around the coil 320 The electromagnetic force with which the rotor 200 is rotated generates a driving force.

As a result, the rotor 200 rotates, and the shaft 110, to which the rotor 200 is fixedly coupled, rotates in conjunction with the rotor 200.

The rotor 200 may seal the lubricating fluid with the upper circumferential surface of the sleeve housing 140 and may include a circumferential wall formed to protrude axially downward from one surface of the rotor 200 to seal the lubricating fluid, (216).

That is, the circumferential wall 216 may protrude from one surface of the rotor 200 as a rotating member to seal the lubricating fluid with the sleeve housing 140 as a fixing member.

Specifically, the circumferential wall 216 is formed between the inner circumferential surface of the circumferential wall 216 and the circumferential outer circumferential surface of the sleeve housing 140, 140, respectively.

The bottom surface of the circumferential wall 216 may be formed to face the base member 310 to which the sleeve housing 140 is fixed.

FIG. 2 is an enlarged cross-sectional view of a portion A of FIG. 1, FIG. 3 is an assembled cross-sectional view of a sleeve and a rotor case according to an embodiment of the present invention, , A sleeve housing, and a rotor case.

2 to 4, a hydrodynamic bearing assembly 100 according to an embodiment of the present invention may include a shaft 110, a sleeve 120, a thrust plate 130, and a sleeve housing 140 have.

The sleeve 120 may support the shaft 110 such that the upper end of the shaft 110 protrudes upward in the axial direction, and forge Cu or Al, or sinter Cu-Fe alloy powder or SUS powder. Can be formed.

Here, the shaft 110 is inserted into the shaft 120 so as to have a minute clearance, and the minute clearance is filled with a lubricating fluid, and at least the outer diameter of the shaft 110 and the inner diameter of the sleeve 120 The rotation of the shaft 110 can be more smoothly supported by the radial dynamic pressure grooves 121a formed in one.

The radial dynamic pressure groove 121a may be formed on an inner circumferential surface of the sleeve 120 inside the shaft hole of the sleeve 120. When the shaft 110 rotates, So as to smoothly rotate.

However, the radial dynamic pressure grooves 121a are not limited to those provided on the inner circumferential surface of the sleeve 120, and may be provided on the outer circumferential surface of the shaft 110, I will reveal.

The radial dynamic pressure grooves 121a may be any one of a herringbone shape, a spiral shape, and a thread shape, and there is no limitation on the shape of the radial dynamic pressure groove 121a if it generates a radial dynamic pressure.

A thrust dynamic pressure groove 121b may be formed in at least one of the upper surface of the sleeve 120 and the upper surface of the sleeve 120. The thrust dynamic pressure groove 121b may be formed in at least one of the upper surface of the sleeve 120 and the upper surface of the sleeve 120, The rotor 200 can be rotated in association with the shaft 110 while a certain lifting force is secured.

The shape of the thrust dynamic pressure groove 121b may be a herringbone shape, a spiral shape, or a threadlike groove like the radial dynamic pressure groove 121a, but is not limited thereto and may be a shape capable of providing thrust dynamic pressure Can be applied.

A protrusion 123 protruding outward in the radial direction may be provided on the upper portion of the sleeve 120.

The thrust dynamic pressure groove 121b may be formed on an upper surface of the protrusion 123, and a portion of the lower surface of the protrusion 123 may contact an upper end of the sleeve housing 140 to be described later.

On the other hand, the lower portion of the sleeve 120 may be provided with a step toward the radially outward from the inner circumferential surface of the sleeve 120 to accommodate the thrust plate 130 to be described later.

The sleeve 120 may be formed with a first circulation hole 125 penetrating the inner circumferential surface and the outer circumferential surface of the sleeve 120, and from the lower portion of the sleeve 120 of the outer circumferential surface of the sleeve 120, the protrusion ( At least one groove may be formed on an outer circumferential surface of the sleeve 120 including a part of the 123.

The second circulation hole 127 may be formed by the groove and the inner circumferential surface of the sleeve housing 140 when the sleeve 120 is coupled to the sleeve housing 140 to be described later, 127 may communicate with the first circulation hole 125.

The first circulation hole 125 and the second circulation hole 127 may distribute the pressure of the lubricating fluid within the fluid dynamic pressure bearing assembly 100 to maintain the balance, 100 can be moved to be discharged by circulation.

Here, the second circulation hole 127 may be formed by cutting a portion of the outer circumferential surface of the sleeve 120.

Specifically, the second circulation hole 127 may be formed by cutting a portion of an outer circumferential surface of the sleeve 120 including a portion of the protrusion 123 from the lower portion of the sleeve 120.

Since a portion of the outer circumferential surface of the sleeve 120 is cut, a micro gap may be formed between the sleeve 120 and the sleeve housing 140 surrounding the outer circumferential surface of the sleeve 120, and the micro gap may be formed by the micro gap. 2 circulation holes 127 may be formed.

The sleeve 120 may be inserted into the sleeve housing 140.

That is, the inner circumferential surface of the sleeve housing 140 and the outer circumferential surface of the sleeve 120 may be coupled by at least one of sliding, bonding, welding, and pressing methods, and the inner diameter of the sleeve housing 140 may be in an axial direction. The same may be formed continuously in succession.

The sleeve housing 140 may be formed by lathe machining or pressing, and the outer circumferential surface of the sleeve 120 and the inner circumferential surface of the sleeve housing 140 may be joined by an adhesive since the lubricating fluid does not need to be filled. have.

Meanwhile, a sealing part may be formed to seal a lubricating fluid between an upper outer peripheral surface of the sleeve housing 140 and the main wall part 216 protruding from one surface of the rotor 200.

Therefore, the upper outer circumferential surface of the sleeve housing 140 may be tapered so that the lubricating fluid is sealed, and specifically, the outer diameter may be reduced from the upper side in the axial direction toward the lower side.

The thrust plate 130 is disposed in the axial lower portion of the sleeve 120 and can be accommodated in a step formed radially outward from the inner circumferential surface of the sleeve 120.

The thrust plate 130 has a hole corresponding to an end surface of the shaft 110 at the center, and the shaft 110 can be inserted into the hole.

It is preferable that the outer diameter of the thrust plate 130 is formed such that there is no problem in the degree of balance when the shaft 130 is inserted into the hole of the thrust plate 130.

The thrust plate 130 may be separately formed and coupled to the shaft 110. The thrust plate 130 may be integrally formed with the shaft 110 from the time of manufacture, As shown in Fig.

Meanwhile, a communication channel 129 may be formed between the axial upper end of the sleeve housing 140 and the lower surface of the protrusion 123 so that the second circulation hole 127 communicates with the outside of the sleeve 120. have.

That is, since a portion of the outer circumferential surface of the sleeve 120 is cut and a portion of the lower surface of the protrusion 123 is also cut, a minute gap may be formed between the upper end of the sleeve housing 120 and the lower surface of the protrusion 123. The communication channel 129 may be formed by the minute gap.

The pressure in the fluid dynamic pressure bearing assembly 100 can be maintained to be the same by the first circulation hole 125, the second circulation hole 127, and the communication channel 129, And bubbles or the like existing in the fluid dynamic pressure bearing assembly 100 can be moved to be discharged by circulation.

5 is a schematic cross-sectional view of a motor including a fluid dynamic bearing assembly according to another embodiment of the present invention.

Referring to FIG. 5, the motor 600 according to another embodiment of the present invention is an embodiment of the present invention described with reference to FIGS. 1 to 4 except for the sleeve housing 140 ′ and the cover plate 150. Since the same as the motor 500 according to, except for the sleeve housing 140 'and the cover plate 150 will be omitted description.

The sleeve 120 may be inserted into the sleeve housing 140 ′.

That is, the inner circumferential surface of the sleeve housing 140 ′ and the outer circumferential surface of the sleeve 120 may be coupled by at least one of sliding, bonding, welding, and pressing methods, and the inner diameter of the sleeve housing 140 ′ may be combined. The same may be formed continuously in the axial direction.

The sleeve housing 140 ′ may be formed by lathe machining or press working, and the outer circumferential surface of the sleeve 120 and the inner circumferential surface of the sleeve housing 140 ′ may be joined by an adhesive since lubricating fluid does not need to be filled. Can be.

Meanwhile, a sealing part may be formed to seal the lubricating fluid between the upper outer peripheral surface of the sleeve housing 140 ′ and the main wall part 216 protruding from one surface of the rotor 200.

Therefore, the upper outer circumferential surface of the sleeve housing 140 ′ may be tapered so that the lubricating fluid is sealed, and specifically, the outer diameter of the sleeve housing 140 ′ may be tapered.

On the other hand, the lower end of the sleeve housing may be formed with a coupling portion (141 ') for coupling with the cover plate to be described later.

The cover plate 150 may be coupled to the sleeve housing 140 ′ while maintaining a gap with a lower portion of the sleeve 120.

The cover plate 150 may serve as a bearing for supporting a lower surface of the shaft 110 by receiving a lubricating fluid in a gap formed between the sleeve 120 and itself.

In this case, the cover plate 150 may be fixed in various ways, such as welding, caulking, or bonding, which may be selectively applied according to the structure and process of the product.

Through the above embodiment, the motor according to the present invention can maintain the pressure inside the hydrodynamic bearing assembly uniformly, and can move the bubbles and the like in the lubricating fluid to be discharged by circulation.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that such modifications or variations are within the scope of the appended claims.

100: hydrodynamic bearing assembly 110: shaft
120: Sleeve 130: Thrust plate
140: Sleeve housing 200: Rotor
210: rotor case 220: magnet
300: stator 310: base member
320: coil 330: core
340: Pooling plate

Claims (10)

A sleeve supporting the shaft through a lubricating fluid and having a first circulation hole penetrating the inner circumferential surface and the outer circumferential surface;
A sleeve housing into which the sleeve is inserted; And
A second circulation hole formed to communicate with the first circulation hole between the sleeve and the sleeve housing; Lt; / RTI >
The method of claim 1,
And a radially outwardly projecting protrusion is formed on the top of the sleeve.
3. The method of claim 2,
And an axial upper end of the sleeve housing is in contact with a portion of the bottom surface of the protrusion.
3. The method of claim 2,
And a communication channel is formed between the axial upper end of the sleeve housing and the lower surface of the protrusion so that the second circulation hole communicates with the outside of the sleeve housing.
The method of claim 1,
And the second circulation hole is formed by cutting a part of an outer circumferential surface of the sleeve.
The method of claim 1,
A rotor fixed to the shaft to rotate in conjunction with the shaft; Fluid hydrodynamic bearing assembly further comprising.
The method according to claim 6,
Wherein the rotor has a circumferential wall protruding from one surface of the rotor so as to face the outer circumferential surface of the sleeve housing.
The method of claim 7, wherein
And a sealing portion is formed between the outer circumferential surface of the sleeve housing and the inner circumferential surface of the circumferential wall to seal the lubricating fluid.
The method of claim 7, wherein
And an upper outer circumferential surface of the sleeve housing is tapered to seal the lubricating fluid.
10. A hydrodynamic bearing assembly as claimed in any one of claims 1 to 9, And
A stator coupled to the fluid dynamic pressure bearing assembly and having a core through which a coil for generating a rotational driving force is wound; / RTI >
KR1020120080761A 2012-07-24 2012-07-24 Hydrodynamic bearing assembly and motor including the same KR20140015774A (en)

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Application Number Priority Date Filing Date Title
KR1020120080761A KR20140015774A (en) 2012-07-24 2012-07-24 Hydrodynamic bearing assembly and motor including the same

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US11432593B2 (en) 2017-04-11 2022-09-06 Kt&G Corporation Device for cleaning smoking member, and smoking member system
US11470882B2 (en) 2017-04-11 2022-10-18 Kt&G Corporation Device for holding smoking member, and smoking member system
US11622582B2 (en) 2017-04-11 2023-04-11 Kt&G Corporation Aerosol generating device and method for providing adaptive feedback through puff recognition
US11771138B2 (en) 2017-04-11 2023-10-03 Kt&G Corporation Aerosol generating device and method for providing smoking restriction function in aerosol generating device

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US11197497B2 (en) 2017-04-11 2021-12-14 Kt&G Corporation Aerosol generating device
US11246345B2 (en) 2017-04-11 2022-02-15 Kt&G Corporation Aerosol generating device provided with rotary heater
US11252999B2 (en) 2017-04-11 2022-02-22 Kt&G Corporation Aerosol generating device
US11259571B2 (en) 2017-04-11 2022-03-01 Kt&G Corporation Aerosol generating apparatus provided with movable heater
US11432593B2 (en) 2017-04-11 2022-09-06 Kt&G Corporation Device for cleaning smoking member, and smoking member system
US11470882B2 (en) 2017-04-11 2022-10-18 Kt&G Corporation Device for holding smoking member, and smoking member system
US11622582B2 (en) 2017-04-11 2023-04-11 Kt&G Corporation Aerosol generating device and method for providing adaptive feedback through puff recognition
US11771138B2 (en) 2017-04-11 2023-10-03 Kt&G Corporation Aerosol generating device and method for providing smoking restriction function in aerosol generating device

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