JP7159094B2 - Disk device cover structure - Google Patents

Description

The present invention relates to a cover structure for a disk device such as a magnetic disk device.

2. Description of the Related Art In a disk device such as a magnetic disk device, information is read from and written to a rotating disk, which is a recording medium. It is known that the rotation of the disk causes vibration and noise.

This vibration and noise are generated by transmission of rotational vibration of the disk to the housing. Therefore, by increasing the rigidity of the housing, such vibration and noise can be suppressed.

In recent disk devices, it is sometimes required to increase the number of disks in order to increase the storage capacity, but it is also required to suppress the increase in the overall thickness.

In order to deal with this, it is conceivable to reduce the thickness of the cover of the housing to increase the internal space. However, if the thickness of the cover is reduced, there is a problem that sufficient rigidity for suppressing vibration and noise cannot be ensured.

As a technique for suppressing vibration and noise of a disk device, Patent Document 1 discloses a cover structure in which a damping plate is attached to a concave portion formed on the outer surface of the cover.

However, when the thickness of the cover is reduced, even if such a cover structure is adopted, vibration and noise cannot be sufficiently suppressed.

JP-A-2002-298567

The problem to be solved is that when the thickness of the cover is reduced, vibration and noise cannot be sufficiently suppressed.

The present invention provides a cover attached to an opening of a base of a housing that accommodates a mechanical portion of a disk device, and a position formed on the cover that protrudes most outward in the thickness direction of the cover according to the configuration of the mechanical portion. A stepped portion having a bottom surface located inside the mechanism portion at a depth exceeding the plate thickness of the cover with respect to the outside, and a stepped portion located inside the stepped portion and attached by welding in a state of being in contact with the bottom surface of the stepped portion. and a reinforcing member that does not protrude outside the stepped portion .

INDUSTRIAL APPLICABILITY According to the present invention, even if the thickness of the cover is reduced, the rigidity can be improved by the welded reinforcing member, so vibration and noise can be sufficiently suppressed.

It is a top view of a disc device (Example 1). FIG. 2 is a cross-sectional view of the disk device of FIG. 1 taken along line II-II (Embodiment 1); FIG. 3 is an enlarged cross-sectional view of a main part of FIG. 2 (Example 1); (A) to (C) are cross-sectional views enlarging essential parts of the cover during manufacture (Example 1). It is sectional drawing which expanded the principal part of a comparative example (Example 1). It is sectional drawing which expanded the principal part of the disk apparatus which concerns on a modification (Example 1). FIG. 11 is an enlarged cross-sectional view of a main part of a disk device according to another modified example (Embodiment 1); FIG. 11 is a cross-sectional view of a disk device (Embodiment 2); FIG. 9 is an enlarged cross-sectional view of the main part of FIG. 8 (Example 2); FIG. 12 is an enlarged cross-sectional view of a main part of the disk device (Embodiment 3);

The purpose of sufficiently suppressing vibration and noise even when the thickness of the cover is reduced is achieved by a disk device cover structure in which a reinforcing member is welded in contact with the bottom surface of the stepped portion of the cover.

That is, the cover structure includes a cover of a housing that accommodates the recording medium of the disk device, and a stepped portion that is formed in the cover and has a bottom surface that is located inside the outermost portion of the cover that protrudes most outwardly in the thickness direction of the cover. and a reinforcing member positioned within the stepped portion and attached by welding in contact with the bottom surface of the stepped portion.

The stepped portion may have a side surface rising in the thickness direction from the edge of the bottom surface.

The stepped portion may be a concave portion whose side surfaces surround the bottom surface.

The side surface of the stepped portion may be tapered outward in the thickness direction away from the edge of the bottom surface in the direction along the bottom surface.

The cover structure may include a positioning projection provided on one of the bottom surfaces of the reinforcing member and the stepped portion, and a positioning hole provided on the other of the bottom surface of the reinforcing member and the stepped portion for engaging the positioning projection.

The reinforcing member may be made of a material with a higher modulus of elasticity than the cover.

The reinforcing member may be made of a material with a higher specific gravity than the cover.

[Structure of Cover Structure of Disk Device]
FIG. 1 is a plan view of a disk device. 2 is a cross-sectional view of the disk device of FIG. 1 taken along line II--II, and FIG. 3 is an enlarged cross-sectional view of the main part thereof.

The disk device 1 of this embodiment is a hard disk drive as a magnetic disk device, and a housing 3 accommodates a mechanical portion 7 such as a disk assembly 5 and a head gimbal assembly (not shown).

Note that the disk device 1 is not limited to a magnetic disk device, and may be another disk device such as an optical disk device.

The disc assembly 5 has a structure in which a plurality of discs 9 as recording media are stacked and supported by a spindle motor 11 . The stacking direction of the discs 9 is the thickness direction of the disc device 1 (hereinafter simply referred to as "thickness direction").

The spindle motor 11 has a rotor 15 rotatable about the shaft 13 , and a disk 9 supported on the outer circumference of the rotor 15 . The supporting state of the disk 9 is held by a clamp 17 attached to the rotor 15 at one end in the thickness direction. In the spindle motor 11, both ends of the shaft 13 in the thickness direction are fixed to the base 19 and the cover 21 of the housing 3, respectively. The details of the rotor 15 of the spindle motor 11 are well known, and illustration and description thereof are omitted.

The base 19 of the housing 3 has a box-like shape with one end in the thickness direction open, and accommodates the mechanism section 7 such as the disk assembly 5 therein. The base 19 of this embodiment has a substantially rectangular shape in plan view. The base 19 is sealed by attaching a cover 21 to the opening.

The cover 21 is a metal plate-like body corresponding to the opening of the base 19 . The cover 21 of this embodiment is formed by press-molding an aluminum alloy plate or a stainless steel alloy plate having a thickness of about 0.3 mm to 0.8 mm, for example.

The cover 21 is attached to the base 19 by fastening the peripheral edge of the cover 21 to the base 19 with screws 23 . A sealing member 25 for sealing is interposed between the cover 21 and the base 19 .

A cover structure 31 including a stepped portion 27 and a reinforcing member 29 is applied to the cover 21 .

The stepped portion 27 is formed on the cover 21 and has a bottom surface 37 located inside an outermost surface 33 that is the outermost portion of the cover 21 that protrudes outwardly in the thickness direction of the cover 21 . The thickness direction of the cover 21 is the same as the thickness direction of the housing 3 .

The outermost surface 33 of the cover 21 of this embodiment is the surface of the projecting portion 35 of the cover 21 . The projecting portion 35 is formed by bending the cover 21 to avoid the clamp 17 of the spindle motor 11 and is positioned above the clamp 17 of the spindle motor 11 in the thickness direction.

The stepped portion 27 of this embodiment is a portion that is relatively recessed by the projecting portion 35 of the cover 21 and is positioned above the disk 9 in the thickness direction. In addition, as long as the portion is relatively concave, it may be positioned other than on the disk 9 in the thickness direction. For example, it may be located on the sealing member 25 , in which case it may be located along the sealing member 25 .

Note that the outermost surface 33 is set according to the configuration of the mechanism section 7 and may be other than the surface of the projecting portion 35 of the cover 21 positioned above the clamp 17 . Further, the position where the stepped portion 27 is formed is not limited to the top of the disc 9, and may be any other portion as long as it can have a bottom surface located inside the outermost surface 33. FIG.

The stepped portion 27 of this embodiment has a side surface 39 rising from the edge of the bottom surface 37 in the thickness direction. A side surface 39 extends from the bottom surface 37 to the outermost surface 33 . However, the side surface 39 may extend to another surface located outside the bottom surface 37 and inside the outermost surface 33 in the thickness direction.

The side surface 39 of this embodiment is formed in a tapered shape and separated from the bottom surface 37 toward the outermost surface 33 side in the plane direction. Note that the planar direction refers to the direction along the bottom surface 37 .

Therefore, the side surface 39 has a tapered shape that separates from the bottom surface 37 in the planar direction toward the outer side in the thickness direction. Curved surfaces 41 and 43 are continuous between the side surface 39 and the bottom surface 37 and the outermost surface 33 .

The depth in the thickness direction of the stepped portion 27 of this embodiment (the dimension in the thickness direction between the outermost surface 33 and the bottom surface 37 ) is set larger than the plate thickness of the cover 21 . The plate thickness of the cover 21 is uniform throughout. However, the plate thickness of the cover 21 may not be uniform, such as by partially increasing the plate thickness.

A reinforcing member 29 is fixed in the stepped portion 27 .

The reinforcing member 29 is positioned within the stepped portion 27 and is attached by welding while being in contact with the bottom surface 37 of the stepped portion 27 . Thereby, the reinforcement member 29 improves the rigidity of the cover 21 . Although the welding method is not particularly limited, spot welding is used in this embodiment, and a plurality of welded portions 44 are formed.

The reinforcing member 29 of this embodiment is a metallic plate-like body positioned within the stepped portion 27 . In addition, the reinforcing member 29 is not limited to a plate-like body, and may be a rod-like shape or the like. In this embodiment, the reinforcing member 29 is made of the same material as the cover 21 or a material that satisfies at least one of a higher elastic modulus and a higher specific gravity than the cover 21 . However, the material of the reinforcing member 29 may be another material.

If the reinforcing member 29 has a higher modulus of elasticity than the cover 21, it is advantageous for improving the rigidity of the cover 21, and if it has a higher specific gravity than the cover 21, it is advantageous for improving damping properties. Even if the reinforcement member 29 is made of the same material as the cover 21, the reinforcement member 29 can be welded to the stepped portion 27 of the cover 21 to improve the rigidity and damping performance of the cover 21. The same is true for other materials.

The thickness of the reinforcing member 29 is set equal to or smaller than the depth of the stepped portion 27 so that the reinforcing member 29 does not protrude outward from the outermost surface 33 in the thickness direction.

The reinforcing member 29 of this embodiment is C-shaped in plan view, and the inner peripheral edge 45 , which is the edge portion, is arranged along the side surface 39 of the stepped portion 27 so as to surround the spindle motor 11 . An inner peripheral edge 45 of the reinforcing member 29 is arranged in contact with or close to the side surface 39 of the stepped portion 27 .

Note that the reinforcement member 29 may be placed in any position as long as it is possible to suppress vibration and noise by improving the rigidity of the cover 21, and is not limited to the periphery of the spindle motor 11. can do. Also, the reinforcing member 29 can be provided at a plurality of locations. The plan view shape of the reinforcing member 29 may be another shape such as a linear shape.

[Manufacture of cover]
FIGS. 4A to 4C are enlarged cross-sectional views of essential parts of the cover during manufacturing. Although the position of the welded portion 44 in FIG. 4(C) does not match that in FIG. 1, it is illustrated for easy understanding.

When manufacturing the cover 21, first, as shown in FIG. 4A, the cover 21 having a predetermined shape having the stepped portion 27, the projecting portion 35, and the like is formed by press molding.

Next, as shown in FIGS. 4B and 4C, the reinforcing member 29 is positioned on the bottom surface 37 of the stepped portion 27 of the cover 21 and then fixed by welding.

When positioning the reinforcing member 29 on the bottom surface 37 of the stepped portion 27 , the reinforcing member 29 is placed so as to be in contact with the bottom surface 37 of the stepped portion 27 . This placement can be guided by the side surface 39 of the stepped portion 27 .

When the reinforcing member 29 is placed on the bottom surface 37 of the stepped portion 27 , the inner peripheral edge 45 of the reinforcing member 29 and the side surface 39 of the stepped portion 27 face each other in the planar direction along the bottom surface 37 . Therefore, the reinforcing member 29 is restrained from moving in the planar direction by the side surface 39 of the stepped portion 27, and is roughly and primarily positioned.

Here, the side surface 39 of the stepped portion 27 has a tapered shape in which the closer the side surface 39 is to the bottom surface 37 in the thickness direction, the closer the side surface 39 is to the bottom surface 37 in the surface direction. For this reason, in the primary positioning of the reinforcing member 29, it is preferable to make the inner peripheral edge 45 of the reinforcing member 29 face a portion of the side surface 39 near the bottom surface 37 in the thickness direction in order to improve accuracy.

In this regard, in this embodiment, the inner peripheral edge 45 of the reinforcing member 29 in contact with the bottom surface 37 faces the portion of the side surface 39 near the bottom surface 37 in the thickness direction in the plane direction, so the primary positioning accuracy is improved. can be improved.

In particular, in this embodiment, since the corners 47 of the inner peripheral edge 45 of the reinforcing member 29 that contacts the bottom surface 37 face the side surface 39 in the plane direction, the primary positioning accuracy can be reliably improved.

After placing the reinforcing member 29 on the bottom surface 37 , the reinforcing member 29 is secondarily positioned accurately at the welding position by a jig or the like and welded to the bottom surface 37 of the stepped portion 27 .

[Comparative example]
FIG. 5 is an enlarged cross-sectional view of a main part of the comparative example.

In the comparative example, the reinforcing member 29 is attached to the bottom surface 37 of the stepped portion 27 with the adhesive 30 as in the prior art. In this comparative example, since the adhesive 30 is interposed between the reinforcing member 29 and the bottom surface 37 of the stepped portion 27, it is not possible to improve the rigidity of the cover 21 by the reinforcing member 29. FIG.

In addition, since the reinforcing member 29 is positioned above the bottom portion 37 in the thickness direction by the amount of the adhesive 30, the primary positioning accuracy of the reinforcing member 29 is also lowered.

[Effect of Example 1]
As described above, the cover structure 31 of the disk device 1 of the present embodiment is formed of the cover 21 of the housing 3 that accommodates the disk 9 of the disk device 1 and the cover 21, and the outermost portion of the cover 21 in the thickness direction. A stepped portion 27 having a bottom surface 37 located inside the protruded outermost surface 33, and a reinforcing member 29 positioned within the stepped portion 27 and attached by welding while being in contact with the bottom surface 37 of the stepped portion 27. and

Therefore, in this embodiment, even if the thickness of the cover 21 is reduced, the rigidity can be improved by the welded reinforcing member 29, so that vibration and noise can be sufficiently suppressed. Further, in this embodiment, the reinforcing member 29 attached to the cover 21 serves as a weight to improve damping. Moreover, since the reinforcing member 29 is positioned within the stepped portion 27, an increase in the thickness of the disk device 1 can be suppressed.

In this embodiment, the side surface 39 rises from the edge of the bottom surface 37 of the stepped portion 27, and the side surface 39 of the stepped portion 27 is tapered outward in the thickness direction away from the edge of the bottom surface 37 in the plane direction. be.

Therefore, in this embodiment, when the reinforcing member 29 is welded, the reinforcing member 29 can be guided by the side surface 39 and placed in contact with the bottom surface 37 of the stepped portion 27 .

At this time, the inner peripheral edge 45, which is the edge of the reinforcing member 29 in contact with the bottom surface 37 of the stepped portion 27, faces the portion of the side surface 39 near the bottom surface 37 in the thickness direction in the planar direction. can be positioned accurately.

Therefore, in this embodiment, it is possible to improve the rough primary positioning accuracy of the reinforcing member 29, and to improve the mounting accuracy of the reinforcing member 29 through subsequent secondary positioning and welding.

Further, if the reinforcing member 29 is made of a material having a higher modulus of elasticity than the cover 21, it is advantageous for improving the rigidity of the cover 21. As shown in FIG. Further, when the reinforcing member 29 has a higher specific gravity than the cover 21, the function as a weight is improved, which is advantageous for improving the damping property.

[Modification]
FIG. 6 is an enlarged cross-sectional view of a main part of the disk device 1 according to the modification.

In this modification, the side surface 39 of the stepped portion 27 is formed parallel to the thickness direction. Others have the same configuration as the first embodiment.

FIG. 7 is an enlarged cross-sectional view of a main part of the disk device 1 according to another modification.

In this modification, the depth in the thickness direction of the stepped portion 27 is set smaller than the plate thickness of the cover 21 . Others have the same configuration as the first embodiment.

Also in these modifications, the same effect as Example 1 can be produced.

8 is a cross-sectional view of the disk device, and FIG. 9 is a cross-sectional view enlarging the main part of FIG. In addition, in Example 2, the same code|symbol is attached|subjected to the component corresponding to Example 1, and the overlapping description is abbreviate|omitted.

In Example 2, the stepped portion 27 is formed as a concave portion. Other configurations are the same as those of the first embodiment.

Using the space S between the cover 21 of the housing 3 and the mechanism portion 7 , the stepped portion 27 is bent in a concave shape with respect to the outermost surface 33 of the cover 21 . In this embodiment, the space S above the disc 9 in the thickness direction is used to form the stepped portion 27 within the thickness range of the clamp 17 of the spindle motor 11 .

The stepped portion 27 as such a recess is provided so that the side surface 39 surrounds the bottom surface 37 .

Therefore, in the second embodiment as well, it is possible to achieve the same effects as in the first embodiment. In addition, in the second embodiment, since the bottom surface 37 is surrounded by the side surfaces 39, the positioning accuracy can be further improved in rough primary positioning of the reinforcing member 29. FIG.

FIG. 10 is an enlarged cross-sectional view of the main part of the disk device. In addition, in Example 3, the same code|symbol is attached|subjected to the component corresponding to Example 1, and the overlapping description is abbreviate|omitted.

In this embodiment, a positioning projection 49 provided on the bottom surface 37 of the stepped portion 27 and a positioning hole 51 provided in the reinforcing member 29 and engaging the positioning projection are provided. The positioning projections 49 and the positioning holes 51 are for accurate positioning of the reinforcing member 29 to the welding position.

Although the positioning hole 51 penetrates the reinforcing member 29, it may be a recessed bottomed hole. Alternatively, the positioning protrusion 49 may be provided on the reinforcing member 29 and the positioning hole 51 may be provided on the bottom surface 37 of the stepped portion 27 . Therefore, the positioning protrusion 49 may be provided on one of the reinforcing member 29 and the bottom surface 37 of the stepped portion 27 , and the positioning hole 51 may be provided on the other of the reinforcing member 29 and the bottom surface 37 of the stepped portion 27 .

Other configurations are the same as those of the first embodiment, but may be the same as those of the second embodiment.

Therefore, in this embodiment, the same effects as in the first embodiment can be obtained.

In addition, in this embodiment, when the reinforcing member 29 is attached to the stepped portion 27 , the positioning protrusion 49 and the positioning hole 51 can be positioned relative to each other by rough and primary positioning of the reinforcing member 29 .

Therefore, by engaging the positioning projections 49 with the positioning holes 51 after the primary positioning, it is possible to perform accurate secondary positioning of the reinforcing member 29 to the welding position.

Therefore, in this embodiment, the work of attaching the reinforcing member 29 to the stepped portion 27 can be easily performed.

1 disk device 3 housing 9 disk (recording medium)
21 Cover 27 Step 29 Reinforcing member 31 Cover structure 33 Outermost surface 37 Bottom surface 38 Edge 39 Side surface 49 Positioning protrusion 51 Positioning hole

Claims (7)

a cover attached to an opening of a base of a housing that accommodates the mechanism of the disk device;
A bottom surface which is formed on the cover and which is positioned inside the mechanism section at a depth exceeding the plate thickness of the cover with respect to the outermost portion of the position that protrudes to the outermost side in the thickness direction of the cover according to the configuration of the mechanism section. a stepped portion having
a reinforcing member positioned within the stepped portion and attached by welding in a state of being in contact with the bottom surface of the stepped portion and not protruding outside the stepped portion;
A cover structure for a disk device with a A cover structure for a disk device according to claim 1,
The stepped portion has a side surface rising from the edge of the bottom surface in the thickness direction,
Disk device cover structure. A cover structure for a disk device according to claim 2,
The stepped portion is a recessed portion in which the side surface surrounds the bottom surface,
Disk device cover structure. 4. The disk device cover structure according to claim 2 or 3,
The side surface of the stepped portion has a tapered shape that separates from the edge of the bottom surface in a direction along the bottom surface toward the outside in the thickness direction,
Disk device cover structure. The disk device cover structure according to any one of claims 1 to 4,
a positioning projection provided on one of the bottom surfaces of the reinforcing member and the stepped portion;
a positioning hole provided in the other of the reinforcing member and the bottom surface of the stepped portion for engaging the positioning projection;
A cover structure for a disk device with a The disk device cover structure according to any one of claims 1 to 5,
The reinforcing member is made of a material having a higher elastic modulus than the cover,
Disk device cover structure. The disk device cover structure according to any one of claims 1 to 6,
The reinforcing member is made of a material having a higher specific gravity than the cover,
Disk device cover structure.

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