KR20130057088A

KR20130057088A - Base assembly for motor and hard disk drive including the same

Info

Publication number: KR20130057088A
Application number: KR1020110122839A
Authority: KR
Inventors: 최태영
Original assignee: 삼성전기주식회사
Priority date: 2011-11-23
Filing date: 2011-11-23
Publication date: 2013-05-31

Abstract

PURPOSE: A base assembly for a motor and a hard disk drive are provided to solidly connect a buffer unit and a base which is manufactured by press processing. CONSTITUTION: A base(110) is formed by press processing and includes a fastening unit(115). When an HSA(Head Stack Assembly) connected to the base is rotated, a buffer unit(120) reduces shock by touching the HSA. A screw unit(130) is inserted into the buffer unit and the fastening unit. The screw unit fixes the buffer unit to the base.

Description

Base assembly for motor and hard disk drive including the same

The present invention relates to a base assembly for a motor and a hard disk drive including the same, and more particularly, to a base assembly for a motor and a hard disk drive including the same in which the coupling structure of the base and the buffer part is improved.

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

In such a hard disk drive, a base is provided with a head drive unit, that is, a head stack assembly (HSA), which allows the magnetic head to be moved on a disc, and the magnetic head rises a predetermined height from the recording surface of the disc by the head drive unit. It performs its function while moving to the desired position.

Conventionally, in manufacturing a base provided in a hard disk drive, aluminum (Al) is produced by a post-processing method that die-casting aluminum and then remove burrs generated by die-casting. have.

However, the conventional die casting method requires a high temperature and a high pressure to require a large amount of energy in the process because the forging aluminum (Al) is injected in a molten state to form a shape, .

In addition, there is a limitation in manufacturing a large number of bases in one mold in terms of the life of the die-casting die, and the base by the die-casting process has a problem that the dimensional accuracy is not good.

So, in order to solve the problem of the die-casting process, the base was manufactured using the press method, but in the case of the press method, the base material has a uniform thickness by the process of pressurizing and bending the plate. There is a limit.

Therefore, when fastening the components for driving the hard disk drive to the base manufactured by the press method, problems may occur in the implementation of the fastening part, even if the fastening part is implemented, the inside of the hard disk drive is completely sealed by the fastening part. It should not be affected.

In addition, when a plurality of fastening portions are to be formed adjacent to each other for fastening with a component for driving a hard disk drive, there is a problem that it is very difficult to form the plurality of fastening portions as described above in the base manufactured by the press method.

Therefore, there is an urgent need to research to manufacture an improved hard disk drive by overcoming the limitation of having a uniform thickness even if the base is manufactured by a press method.

SUMMARY OF THE INVENTION An object of the present invention includes a base assembly for a motor, which facilitates the fastening between a base manufactured by press working and a shock absorbing part that performs a shock absorbing function of a head stack assembly (HSA), thereby improving performance and life. It is to provide a hard disk drive.

Motor base assembly according to an embodiment of the present invention is formed by the press working, the base having a fastening portion; A shock absorbing part that contacts the head stack assembly HSA to reduce impact when the head stack assembly HSA is coupled to the base; And a screw part inserted into the buffer part and the fastening part to fix the buffer part to the base.

The side wall defining the fastening portion of the base assembly for a motor according to an embodiment of the present invention may be formed with a screw tab for screwing with the screw portion.

The fastening part of the base assembly for a motor according to an embodiment of the present invention communicates with the outside and protrudes downward in the axial direction by a burring process, and the screw part passes through the buffer part from an axial upper side and then fastens with the fastening part. Can be.

The fastening part of the base assembly for a motor according to an embodiment of the present invention is projected while the predetermined area of one surface of the base is enclosed and sealed in the other surface direction, and the screw part passes through the buffer part from the upper side in the axial direction and then the fastening part It can be screwed into the part.

The screw part of the base assembly for a motor according to an embodiment of the present invention may include a head for pressing an upper surface of the buffer part, an insertion part inserted into the buffer part, and a fixing part screwed to the fastening part.

The fixing part of the base assembly for a motor according to an embodiment of the present invention may have a diameter smaller than that of the inserting part, thereby preventing friction between the fixing part and the buffer part.

The boundary between the insertion portion and the fixing portion of the base assembly for a motor according to an embodiment of the present invention may be seated on one surface of the base.

The fastening part of the base assembly for a motor according to an embodiment of the present invention communicates with the outside and protrudes downward in the axial direction by a burring process, and the screw part is screwed with the fastening part from an axial lower side and passes through the buffer part. can do.

The screw portion of the base assembly for a motor according to an embodiment of the present invention, the head portion for pressing the bottom surface of the fastening portion protruding downward in the axial direction, the fastening portion screwed to the fastening portion and the insertion portion inserted into the buffer portion It can be provided.

The fastening part of the base assembly for a motor according to an embodiment of the present invention communicates with the outside and protrudes upward in the axial direction by a burring process, and the screw part is screwed with the fastening part from an axial lower side and passes through the buffer part. can do.

The screw portion of the base assembly for a motor according to an embodiment of the present invention may include a head for pressing the bottom surface of the base, a fixing portion screwed to the fastening portion and an insertion portion inserted into the buffer portion.

The shock absorbing portion of the base assembly for a motor according to an embodiment of the present invention may be fixed by pressing the screw portion.

Hard disk drive according to another embodiment of the present invention is a motor base assembly; A spindle motor coupled to the base to rotate the disk; And a head stack assembly (HSA) for moving a magnetic head for recording and reproducing data of the disk to a predetermined position on the disk.

According to the base assembly for a motor and the hard disk drive including the same according to the present invention, it is possible to make the coupling between the base and the shock absorbing part manufactured by press working simple and robust.

It also improves the sealing capability of hard disk drives to maximize performance and sleep.

1 is a schematic exploded perspective view showing a hard disk drive including a base assembly for a motor according to an embodiment of the present invention.
Figure 2 is a schematic perspective view showing a base assembly for a motor according to an embodiment of the present invention.
3 is a schematic enlarged cross-sectional view of A of FIG. 2.
Figure 4 is a schematic perspective view and a cross-sectional view showing only a main portion of the base showing the manufacturing process of the base assembly for the motor according to an embodiment of the present invention.
5 is a schematic enlarged cross-sectional view illustrating a modification of A of FIG. 2.
Figure 6 is a schematic exploded perspective view showing a base assembly for a motor according to another embodiment of the present invention (only the main part of the base is shown).
FIG. 7 is a schematic enlarged cross-sectional view illustrating a coupling relationship of the base, the buffer part, and the screw part shown in FIG. 6. FIG.
Figure 8 is a schematic exploded perspective view showing a base assembly for a motor according to another embodiment of the present invention (only the main part of the base is shown).
9 is a schematic enlarged cross-sectional view illustrating a coupling relationship of the base, the buffer part, and the screw part shown in FIG. 8;

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 readily be suggested, but are also considered to be 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 exploded perspective view showing a hard disk drive including a base assembly for a motor according to an embodiment of the present invention, Figure 2 is a schematic perspective view showing a base assembly for a motor according to an embodiment of the present invention; 3 is a schematic enlarged cross-sectional view of B of FIG. 2.

1 to 3, a base assembly 100 for a motor (hereinafter, referred to as a base assembly) according to an embodiment of the present invention includes a base assembly 100 including a base 110 and a spindle for rotating a disk D. It may include a motor 200 and a head stack assembly (HSA) 300.

First, the term for the direction is defined, the upper or lower direction in the axial direction may mean a direction from the bottom surface of the base 110 toward the upper surface or the opposite direction relative to the base 110 shown in FIG.

The base assembly 100 may include a buffer unit 120 coupled to the base 110 by the base 110 and the screw unit 130.

In the hard disk drive 500 according to the present invention, the base 110 may refer to a housing forming an appearance together with the cover 400, and may include at least one fastening part 115.

Here, the base 110 may manufacture the basic shape by press working, and then may manufacture the final shape of the base 110 through bending or cutting, which is additional processing.

That is, the base 110 according to an embodiment of the present invention is a post-processing method for removing burrs generated by die-casting after die-casting of aluminum (Al). Unlike produced by, cold rolled steel sheet (SPCC, SPCE, etc.), hot rolled steel sheet, stainless steel or lightweight alloy steel sheet such as boron or magnesium alloy can be produced by a single process or additional processing by press working.

Therefore, since the base 110 according to the embodiment of the present invention can be manufactured by press working, the process time and energy consumption can be minimized, resulting in improved production capacity.

Here, the base 110 may provide an inner space, and the inner space may mean a space in which the spindle motor 200 and the head stack assembly HSA 300 are disposed.

On the other hand, the base 110 has at least one fastening portion for coupling with the shock absorbing portion 120 to reduce the impact by contacting the head stack assembly (HSA, 300) when the head stack assembly (HSA, 300) 115).

The fastening part 115 may be formed to protrude in the direction of the other surface by entering a predetermined region of one surface of the base 110 by a burring process, it may mean a hole communicating with the outside.

That is, the fastening part 115 may be formed by projecting a predetermined region of the upper surface of the base 110 downward in the axial direction in the bottom direction by a burring process, and the side wall defining the fastening part 115 may be a screw part. A screw tab for screwing with 130 may be formed.

For the specific fastening method between the fastening portion 115 and the screw portion 130 will be described with reference to the buffer unit 120.

The shock absorber 120 is a component for minimizing the amount of impact when the head stack assembly HSA 300 is rotated or when an external shock is applied, and corresponds to an outer portion of the rotation radius of the head stack assembly HSA 300. May be disposed on the base 110.

Meanwhile, for a detailed description of the shock absorbing part 120, the head stack assembly HSA 300 will be described first. The head stack assembly HSA 300 includes a magnetic head and the magnetic head is positioned at a predetermined position. It may be configured to record the data on the disk (D) or to read the data recorded on the disk (D).

In addition, the head stack assembly HSA 300 moves the magnetic head to a predetermined position of the disk D by a voice coil motor VCM including a coil 310 and upper and lower magnets 320 and 330. You can.

The voice coil motor (VCM) is controlled by a servo control system, the current input by the coil 310 provided to the voice coil motor (VCM) and the magnetic fields formed by the upper and lower magnets (320, 330) By rotating the magnetic head about the pivot axis 117 in the direction according to the Fleming's left hand law.

Accordingly, the head stack assembly HSA 300 may rotate at a predetermined angle about the pivot shaft 117 by the voice coil motor VCM.

In this case, in order to maintain a constant rotation angle of the head stack assembly (HSA, 300), the buffer unit 120 may be coupled to the base 110 corresponding to the outside of the rotation range, and the head stack assembly (HSA, The rotation range of the head stack assembly HSA 300 may be determined by the 300 contacting the buffer 120.

That is, the shock absorbing unit 130 that defines the rotation range of the head stack assembly HSA 300 absorbs an impact amount when the contact with the head stack assembly HSA 300 is performed (including an external impact or the like). In order to reduce the pressure, and to secure the pivoting of the head stack assembly (HSA) 300, it should be firmly coupled to the base 110.

Here, the screw unit 130 may be used to firmly couple the buffer unit 120 to the base 110.

That is, the base 110 may be provided with a fastening part 115 which communicates with the outside by a burring process and protrudes downward in the axial direction, and the screw part 130 moves the shock absorbing part 120 from the upper side in the axial direction. After penetrating, the fastening part 120 may be screwed to the fastening part 115 to fix the buffer part 120 to the base 110.

Here, the screw unit 130 is screwed with the head 132 for pressing the upper surface of the buffer unit 120, the insertion unit 134 and the fastening unit 115 is inserted into the buffer unit 120. The fixing part 136 may be provided.

On the other hand, the outer peripheral surface of the fixing portion 136 may be formed with a screw tab corresponding to the screw tab formed on the fastening portion 115, it may have a diameter smaller than the diameter of the insertion portion 134.

Accordingly, the occurrence of foreign matter due to contact is prevented by preventing contact between the screw tab of the fixing part 136 and the buffer part 120, which may occur in the middle of the screw part 130 passing through the buffer part 120. It can prevent it beforehand.

In other words, the hole 125 formed in the buffer part 120 through which the screw part 130 penetrates is formed to be somewhat larger than the diameter of the fixing part 136 to form sidewalls of the fixing part 136 and the hole 125. Friction may not occur, and thus, a boundary between the fixing part 136 and the insertion part 134 may be seated on one surface of the base 110.

Here, the buffer unit 120 may be fixed to the insertion unit 134 by press-fitting (press fit), the process of screwing the screw unit 130 to the fastening unit 115 formed on the base 110 In the elastic portion may be elastically deformed by the pressing force of the screw 130.

That is, the buffer part 120 may be a rubber material having elasticity, and the screw part (until the boundary between the fixing part 136 and the insertion part 134 is seated on one surface of the base 110). When the 130 is pressurized for screw fastening, the buffer part 120 may be elastically deformed to seal the fastening part 115 from the outside.

Meanwhile, when the screw unit 130 is screwed to the fastening unit 115, a minute space may be formed between the fastening unit 115 and the screw unit 130.

Such a fine space may be a moving passage through which a fine foreign material may flow into the hard disk drive 500 according to the present invention, and the fine foreign matter introduced into the hard disk drive 500 may be a disk (D). It may contaminate the magnetic head.

Therefore, for the high performance of the hard disk drive 500 according to the present invention, such a micro space needs to be completely blocked from the outside, which can be solved by the elastic deformation of the buffer unit 120.

Therefore, the fastening part 115 can be completely blocked from the outside by the elastic deformation of the shock absorbing part 120 generated in the process of screwing the screw part 130 to the fastening part 115. It is possible to prevent the entry of fine foreign matter into the interior of 500).

Meanwhile, the upper and lower magnets 320 and 330 disposed above and below the coil 310 provided to the voice coil motor VCM of the head stack assembly HSA 300 may increase the magnetic flux density and the base 110. ) And may be combined with the upper and lower yokes 340 and 350, respectively.

In addition, in the hard disk drive 500 according to the present invention, an operation start command is input, and the disk D starts to rotate. The voice coil motor VCM rotates the swing arm in a counterclockwise direction, and the magnetic head is rotated. Move on the recording surface of D).

On the contrary, when an operation stop command of the hard disk drive 500 according to an embodiment of the present invention is input, the voice coil motor VCM rotates the swing arm clockwise so that the magnetic head leaves the disk D. .

The magnetic head, which is out of the recording surface of the disk D, is parked on a ramp 360 provided on the outer side of the disk D.

Here, the lamp 360 can park the magnetic head and stably read the data of the disk D by allowing the magnetic head to be spaced apart by a predetermined interval when the magnetic head moves to the disk D.

The spindle motor 200 is for rotating the disk D, and is fixedly installed at the center of the base 110.

The disk D may be coupled to the spindle motor 200 and may have a recording surface on which data is recorded by rotating with the rotation of the spindle motor 200.

Here, a clamp 210 for fastening the disk D to the spindle motor 200 may be fastened to the upper end of the spindle motor 200 by a screw 220.

In addition, although FIG. 1 illustrates a configuration in which one disk D is mounted on the spindle motor 200, this is merely an example, and one or more disks D may be mounted on the spindle motor 200. Can be. When a plurality of disks (D) is mounted in this way, a ring-shaped spacer for maintaining the distance between the disks (D) may be disposed between the disks (D).

4 is a schematic perspective view and a cross-sectional view (only the main part of the base is shown) showing a manufacturing process of a base assembly for a motor according to an embodiment of the present invention.

Referring to FIG. 4, the base 110 may include at least one fastening part 115 for coupling with the buffer part 120, and the fastening part 115 may be the base 110 by a burring process. The predetermined area of the upper surface, which is one surface of the recessed surface, may be formed to protrude toward the bottom surface of the other surface.

That is, the fastening part 115 may mean a hole communicating with the outside, and the side wall defining the fastening part 115 may have a screw tab for screwing with the screw part 130.

Here, the screw tab may be formed at the same time as the burring process for forming the fastening portion 115, but is not necessarily limited thereto, and may be formed through a separate process after the burring process.

On the other hand, after the fastening part 115 is formed by the burring process, the base 110 arranges the shock absorbing part 120 to correspond to the fastening part 115, and replaces the screw part 130 with the shock absorbing part 120. The buffer part 120 may be stably fixed to the base 110 by penetrating the buffer part 120 from the upper side in the axial direction and then screwing the screw to the fastening part 115.

Here, the buffer unit 120 is elastically deformed in the process of rotationally pressing the screw unit 130 to screw the fastening unit 115 to completely seal the fastening unit 115 from the outside, thereby Due to this, it is possible to prevent inflow of fine foreign matter due to a minute space that may exist between the fastening part 115 and the screw part 130, as described above.

5 is a schematic enlarged cross-sectional view illustrating a modification of A of FIG. 2.

Referring to FIG. 5, the base 110 may include at least one fastening part 115a for coupling with the buffer part 120, and the fastening part 115a is an upper surface of one side of the base 110. The predetermined region of the recess may be formed to protrude while being sealed in the bottom direction, which is the other surface.

In other words, the predetermined region of the upper surface of the base 110 may be pressed to recess the predetermined region.

Therefore, the fastening part 115a may be a groove that protrudes while being sealed in the bottom direction of the base 110.

Here, the buffer unit 120 is disposed to correspond to the fastening unit 115a having a groove shape, and then the buffer unit 120 is firmly fixed to the base 110 by screwing by the screw unit 130. Can be.

On the other hand, since the fastening portion 115a formed in the base 110 may be a groove formed to be hermetically sealed, a fine space communicating with the outside and the outside may not be formed between the screw portion 130 and the fastening portion 115a. Can be.

Therefore, even if there is no sealing function by the buffer unit 120, foreign matters to the inside of the hard disk drive 500 can be blocked.

In addition, the specific configuration of the screw 130 and the coupling relationship with the base 110 may be the same as described with reference to FIGS. 1 to 4.

FIG. 6 is a schematic exploded perspective view illustrating a base assembly for a motor according to another embodiment of the present invention (only a main part of the base is shown), and FIG. 7 is a coupling relationship of the base, the buffer part, and the screw part shown in FIG. 6. It is a schematic enlarged cross-sectional view showing.

6 and 7, the base 110 may include at least one fastening part 115 for coupling with the buffer part 120, and the fastening part 115 may be formed by the burring process. A predetermined region of the upper surface, which is one surface of the 110, may be recessed to protrude in the bottom direction, which is the other surface.

That is, the fastening part 115 may mean a hole communicating with the outside, and the side wall defining the fastening part 115 may be formed with a screw tab for screwing the thread 140.

On the other hand, after the fastening part 115 is formed by the burring process, the base 110 arranges the shock absorbing part 120 to correspond to the fastening part 115, and the screw part 140 is disposed from the lower side in the axial direction. After the screw is fastened to the fastening part 115, the buffer part 120 is fixed to the base 110 by inserting the buffer part 120 into the screw part 140 protruding upward of the base 110. Can be.

Here, the screw 140 is a head portion 142 for pressing the bottom surface of the fastening portion 115 protruding downward in the axial direction, a fixing portion 146 screwed with the fastening portion 115 and the buffer portion The insertion part 144 inserted into the 120 may be provided.

In addition, the buffer part 120 may be firmly coupled to the base 110 by being fixed to the inserting part 144 by indentation.

In addition, although the fixing part 146 and the insertion part 144 have shown a difference in diameter in FIGS. 6 and 7, the present invention is not limited thereto.

FIG. 8 is a schematic exploded perspective view illustrating a base assembly for a motor according to another embodiment of the present invention (only a main part of the base is shown), and FIG. 9 is a combination of the base, the buffer part, and the screw part shown in FIG. 8. It is a schematic enlarged sectional view showing the relationship.

8 and 9, the base 110 may include at least one fastening part 115b for coupling with the buffer part 120, and the fastening part 115b may have the base by a burring process. A predetermined area of the lower surface, which is one surface of the 110, may be recessed to protrude in the upper surface direction, which is the other surface.

That is, the fastening portion 115b may mean a hole communicating with the outside, and the side wall defining the fastening portion 115b may have a screw tab for screwing with the screw 140.

Here, the screw tab may be formed at the same time as the burring process for forming the fastening portion 115b, but is not necessarily limited thereto, and may be formed through a separate process after the burring process.

On the other hand, after the fastening part 115b is formed by the burring process, the base 110 arranges the buffer part 120 to correspond to the fastening part 115b protruding upward in the axial direction, and the thread part 140. To the fastening part 115b from the lower side in the axial direction, and then insert the buffer part 120 into the threaded part 140 protruding upward of the base 110. It can be fixed to (110).

Here, the screw portion 140 is a head portion 142 for pressing the bottom surface of the base 110, the fixing portion 146 screwed to the fastening portion 115b and the insertion portion inserted into the buffer portion 120. 144 may be provided.

In addition, although the fixing part 146 and the insertion part 144 have shown a difference in diameter in FIGS. 8 and 9, it should be understood that the present invention is not limited thereto.

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: base assembly for the motor 110: base
115, 115a, 115b: fastening part 120: buffer part
130, 140: thread 200: spindle motor
300: head stack assembly (HSA) 500: hard disk drive

Claims

A base formed by press working and having a fastening portion;
A shock absorbing part that contacts the head stack assembly HSA to reduce impact when the head stack assembly HSA is coupled to the base; And
And a screw portion inserted into the buffer portion and the fastening portion to fix the buffer portion to the base.

The method of claim 1,
The side wall defining the fastening portion is a base assembly for a motor is formed with a screw tab for screwing with the threaded portion.

The method of claim 1,
The fastening portion communicates with the outside and protrudes downward in the axial direction by a burring process,
The screw unit is a base assembly for the motor is screwed to the fastening portion after passing through the buffer portion from the upper side in the axial direction.

The method of claim 1,
The fastening part protrudes in a predetermined area of one surface of the base is sealed in the other surface direction,
And the screw portion is screwed to the fastening portion after passing through the buffer portion from the upper side in the axial direction.

The method according to claim 3 or 4,
The screw unit has a head portion for pressing the upper surface of the buffer portion, the insertion portion inserted into the buffer portion and the base assembly for the motor having a fastening portion screwed with the fastening portion.

The method of claim 5,
The fixing portion has a diameter smaller than the insertion portion, the base assembly for a motor to prevent friction between the fixing portion and the buffer portion.

The method according to claim 6,
The base assembly for the motor is the boundary between the insertion portion and the fixing portion is mounted on one surface of the base.

The method of claim 1,
The fastening portion communicates with the outside and protrudes downward in the axial direction by a burring process,
The screw unit is a base assembly for a motor penetrating the shock absorber after the screw is fastened with the fastening portion from the lower side in the axial direction.

9. The method of claim 8,
The screw unit has a head for pressing the bottom surface of the fastening portion protruding in the axial direction, a fixing portion for screwing the fastening portion and the motor base assembly having an insertion portion inserted into the buffer portion.

The method of claim 1,
The fastening portion communicates with the outside and protrudes upward in the axial direction by a burring process,
The screw unit is a base assembly for a motor penetrating the shock absorber after the screw is fastened with the fastening portion from the lower side in the axial direction.

The method of claim 10,
The screw unit is a base assembly for a motor having a head for pressing the bottom surface of the base, a fixing portion screwed to the fastening portion and the insertion portion inserted into the buffer portion.

The method of claim 1,
The shock absorbing portion is a base assembly for a motor fixed to the screw portion by pressing.

A base assembly for a motor according to claim 1;
A spindle motor coupled to the base to rotate the disk; And
And a head stack assembly (HSA) for moving a magnetic head for recording and reproducing data of the disk to a predetermined position on the disk.