JP2001108106A - Gakset for hard disk drive and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost gasket 1 for a hard disk drive not allowing a damage to a resin material 7 of a vibration-damping steel plate 4 caused by a high temperature and pressure in time of rubber vulcanization in the manufacturing process for the gasket 1 so as to use the vibration-damping steel plate 4 as a substrate 2, and allowing omission of a gluing process in manufacture to relatively easily manufacture it and stabilize its quality. SOLUTION: This gasket 1 has a substrate 2, i.e., a vibration-damping steel plate 4 wherein a resin material 7 is sandwiched between a pair of steel plates 5, 6, and a seal part 11 of a rubber-like elastic material provided on at least one surface of the substrate 2. By processing protrusions 14 formed in the seal part 11 into installation holes 10 formed in the substrate 2, the substrate 2 and the seal part 11 are integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket which is a kind of a sealing device, and more particularly to a gasket suitable for use as a top cover gasket for a hard disk drive and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a gasket for a hard disk drive uses a vulcanization adhesive type of a fluoro rubber type in order to prevent outgassing. Even if you try to use steel plate, the resin material that is a component of it will melt and exude without being able to withstand the high temperature and pressure during rubber vulcanization,
There is a disadvantage that this cannot be used. The damping steel sheet has a resin material sandwiched between a pair of steel sheets, and has a vibration-proofing effect or a sound-proofing effect by utilizing the elasticity of the resin.

[0003] Also, Japanese Patent Application Laid-Open No. 4-229481 discloses that
A technique has been disclosed in which a fluororubber composition is vulcanized and formed alone in advance, and then a seal portion made of the fluororubber composition is adhered to a substrate. Is to be adhered to. Therefore, this conventional technique has the following disadvantages.

[0004] The adhesive has a high viscosity, is difficult to apply, and is subject to equipment restrictions. In addition, since the adhesive has to wait for curing after being applied, it takes a long time to manufacture. In addition, if screen printing or the like is not performed when applying the adhesive, unevenness in quality may occur due to uneven coating.

[0005]

In view of the above, the present invention does not damage the resin material of the damping steel sheet due to the high temperature and high pressure during the rubber vulcanization during the gasket manufacturing process. While it can be used as a substrate,
It is an object of the present invention to provide a gasket for a hard disk drive and a method of manufacturing the gasket, which have no bonding process, are relatively easy to manufacture, can stabilize quality, and are advantageous in cost.

[0006]

In order to achieve the above object, a gasket according to claim 1 of the present invention comprises a substrate made of a damping steel plate having a resin material sandwiched between a pair of steel plates, and at least one surface of the substrate. And a seal portion made of a rubber-like elastic material provided on the substrate, and by press-fitting a projection provided on the seal portion into a mounting hole provided on the substrate, the substrate and the seal portion are integrated. It is characterized by becoming.

[0007] A method of manufacturing a gasket according to a second aspect of the present invention is the method of manufacturing a gasket according to the first aspect, wherein the seal portion provided with the projection is vulcanized and formed by itself beforehand. The substrate and the seal portion are integrated by press-fitting the projection into a mounting hole provided in the substrate.

In the gasket of the present invention having the above-described structure or the method of manufacturing the same, the substrate and the seal portion are integrated by press-fitting the projection provided on the seal portion into the mounting hole provided in the substrate. Therefore, it is possible to attach the seal portion to the substrate without using an adhesive. In addition, since the seal portion provided with the projections is vulcanized and formed separately beforehand, and then the seal portion is attached to the substrate, the high temperature and high pressure during rubber vulcanization of the resin material which is a component of the vibration damping steel plate is applied. Will not work.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a plan view of a gasket (also referred to as a gasket device) 1 according to the embodiment, and FIG.
(A) and (B) each show a partially enlarged cross section.

The gasket 1 according to this embodiment has a seal 11 made of a rubber-like elastic material on one surface of a flat substrate 2 having a through hole 3 at the center of the plane so as to surround the through hole 3. It is provided in an endless shape and is configured as follows.

That is, first, the substrate 2 is formed of a damping steel plate 4 as shown in FIG. 2, and this damping steel plate 4 sandwiches a thermoplastic resin material 7 between a pair of steel plates 5 and 6. This damping steel plate 4 is pressed into the planar shape shown in FIG. 1 to form the substrate 2. The substrate 2 forms a top cover of a hard disk drive (HDD).

A bolt insertion hole (also referred to as a mounting hole) 8 for inserting a tightening bolt or the like is provided at each of the four corners of the substrate 2 having a rectangular outer shape. A required number of flat rectangular tongue-shaped seal mounting portions (also referred to as projection bases) 9 are integrally formed on the same plane. In the drawing, the seal mounting portions 9 are provided at the longitudinal ends of the substrate 2 so as to face each other, and seal mounting holes (also referred to as mounting holes) 10 penetrate through the seal mounting portions 9 in the plate thickness direction. It is provided as follows.

The seal portion 11 is attached to one surface of the substrate 2 as described above. The seal portion main body 12 having an endless shape has the same planar shape as the seal attachment portion 9 corresponding to the seal attachment portion 9. Tongue-shaped projection support 1
3 is integrally formed in parallel with the substrate 2, and a projection 14 which is press-fitted into the seal mounting hole 10 is integrally formed on the projection support portion 13 in a direction opposite to the seal portion main body 12.

The projection 14 has a head 15 that comes out to the opposite side of the substrate 2 after press-fitting.
An inclined guide surface 16 for facilitating press-fitting into the seal mounting hole 10 is provided. Further, the width of the head 15 is formed larger than the inner diameter of the seal mounting hole 10, and an undercut portion 17 is provided on the base end side of the head 15. By engaging with the peripheral edge of the opening of the seal mounting hole 10, the projection 14 is prevented from falling out of the seal mounting hole 10.

The seal portion 11 is attached to the substrate 2 in a non-adhesive manner by press-fitting the projections 14 into the seal attachment holes 10 without using an adhesive.

Further, the seal portion 11 is vulcanized and molded at a predetermined high temperature and high pressure using a fluoro rubber-based rubber as a molding material, and the outgas is sufficiently removed by the secondary vulcanization.

In manufacturing the gasket 1 having the above-described structure, the substrate 2 and the seal portion 11 are separately formed into the product shapes shown in the drawings, and then are provided in the seal mounting holes 10 formed in the substrate 2. Each of the projections 14 is press-fitted, thereby integrating the two 2 and 11. The head 15 of the projection 14 that has come out on the opposite side of the substrate 2 by press-fitting, when the gasket 1 is mounted at the mounting location,
The seal between the housing and the housing (not shown) is not hindered.

In the gasket 1 having the above configuration or the method of manufacturing the same, the seal mounting hole 10
Since the substrate 2 and the seal portion 11 are integrated by press-fitting the projections 14 provided on the seal portion 11, the seal portion 11 can be attached to the substrate 2 without using an adhesive. is there. Therefore, first, a relatively troublesome and time-consuming step of applying an adhesive can be omitted in manufacturing the gasket 1, whereby the gasket 1 can be manufactured relatively easily. In addition, since there is no occurrence of uneven coating of the adhesive, the quality can be stabilized, and equipment for applying the adhesive can be omitted, so that a product that is advantageous in terms of cost can be provided. it can.

Further, since the seal portion 11 provided with the projections 14 is vulcanized and formed independently in advance, and the seal portion 11 is attached to the damping steel plate 4 forming the substrate 2, the structure of the damping steel plate 4 High temperature and high pressure during rubber vulcanization do not act on the resin material 7 as an element. Therefore, since the resin material 7 of the damping steel plate 4 can be prevented from being damaged by the high temperature and high pressure, the vibration damping steel plate 4 can sufficiently exhibit its original vibration-proofing function or sound-proofing function. Thereby, it is possible to provide a high-performance product with respect to the vibration proof property or the sound proof property.

Further, a tongue-shaped seal mounting portion 9 is provided on the substrate 2 and a projection support portion 13 which also has a tongue shape and is overlapped with the seal mounting portion 9 is provided on the seal portion 11. Since the projections 14 are arranged on the support portion 13, the projections 14 are arranged at positions shifted from the seal portion main body 12 on a plane. Therefore, it is possible to prevent the projection 14 from having an adverse effect on the compression action of the seal portion main body 12 which is compressed at the time of mounting to perform a sealing action, thereby providing a product having a high sealing performance. can do. However, in the present invention, the protrusion 1
The arrangement of 4 is not limited to this embodiment, and the protrusions 14 may be arranged at positions overlapping the seal portion main body 12 on a plane as shown in FIGS. Further, the shape and the number of the projections 14 can be changed as appropriate. Other configurations and operational effects of the gasket 1 shown in FIGS. 3 and 4 are the same as those of the gasket 1 according to the embodiment.

Furthermore, as shown by the chain line in FIG. 2 (B), when the head 15 of the projection 14 is located at the gate position in the molding die, a gate mark which may adversely affect the sealing performance may cause a sealing effect. Head 15 of projection 14 not directly related to
In the seal portion main body 12. Therefore, it is possible to prevent a gate mark from remaining on the sealing portion main body 12 and adversely affecting the sealing performance, thereby improving the sealing performance.

[0023]

The present invention has the following effects.

That is, in the gasket of the present invention having the above configuration or the method of manufacturing the same, the substrate and the seal portion are integrated by press-fitting the projection provided on the seal portion into the mounting hole provided in the substrate. For this reason, the seal portion can be attached to the substrate without using an adhesive. Therefore, it is possible to omit a relatively troublesome and time-consuming step of applying the adhesive in manufacturing the gasket, and thereby to manufacture the gasket relatively easily. In addition, since there is no uneven coating of the adhesive, the quality can be stabilized, and equipment related to the application of the adhesive can be omitted. Can be.

Further, since the seal portion provided with the projections is vulcanized and formed independently in advance, and then this seal portion is attached to the damping steel plate forming the substrate, the rubber material is vulcanized to the resin material of the damping steel plate. High temperature and high pressure do not work. Therefore,
Since it is possible to prevent the resin material of the damping steel sheet from being damaged by the high temperature and high pressure, the damping steel sheet can sufficiently exhibit its original anti-vibration effect or sound-proofing effect. Can provide a high-performance product with respect to vibration or sound insulation.

[Brief description of the drawings]

FIG. 1 is a plan view of a gasket according to an embodiment of the present invention.

FIG. 2A is an enlarged sectional view taken along line AA in FIG. 1;
(B) is an enlarged sectional view taken along line BB in FIG.

FIG. 3 is a plan view of a gasket according to another embodiment of the present invention.

FIG. 4C is an enlarged cross-sectional view taken along line CC in FIG. 3;
(D) is an enlarged sectional view taken along line DD in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gasket 2 Substrate 3 Through-hole 4 Damping steel plate 5, 6 Steel plate 7 Resin material 8 Bolt insertion hole 9 Seal mounting part 10 Seal mounting hole (mounting hole) 11 Seal part 12 Seal part main body 13 Projection support part 14 Projection 15 Head Part 16 Guide surface 17 Undercut part

Claims (2)

[Claims] A substrate (2) made of a damping steel plate (4) having a resin material (7) sandwiched between a pair of steel plates (5) and (6).
And a seal portion (11) made of a rubber-like elastic material provided on at least one surface of the substrate (2). The seal portion (11) is provided in a mounting hole (10) provided in the substrate (2). A) a gasket for a hard disk drive, wherein the substrate (2) and the sealing portion (11) are integrated by press-fitting a projection (14) provided in the gasket. 2. The method for manufacturing a gasket according to claim 1, wherein the sealing portion (11) provided with the projection (14) is vulcanized and formed separately beforehand, and then the projection (14) is attached to the substrate. A method for manufacturing a gasket for a hard disk drive, wherein the substrate (2) and the seal portion (11) are integrated by press-fitting into a mounting hole (10) provided in (2).