JPH10331981A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket heightened in assemblage and sealing performance and reusable in spite of being repeatedly disassembled and assembled. SOLUTION: A seal face 10 and a back face of a cover 8 of a container are integrally provided with base parts 2, 3 formed of rubber elastic bodies. Connecting parts 4 formed of a rubber elastic bodies are integrally provided in a plurality of through holes 12 piercing the seal face 10, and both ends of the connecting parts 4 are integrally connected to both base parts 2, 3. A bead part 5 formed of a rubber elastic body is integrally provided at the upper part or the base part 2 on the seal face 10 side. When the cover 8 is fitted to a body, the tip part of the bead part 5 comes in contact with the seal face of the body to seal a clearance. Since a gasket 1 is firmly held to the cover 8, even in case of taking off the cover 8 forcibly due to the bead part 5 sticking to the body side at the time of detaching the cover 8 from the body, the cover 8 is prevented from bending so as to be reusable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for sealing between two members, and more particularly to a gasket effective for sealing between a magnetic head of a hard disk drive, a main body of a container accommodating a magnetic disk and a cover, and the like. It is.

[0002]

2. Description of the Related Art Hard disk drives
A magnetic disk, magnetic head, etc. are located in a container made of aluminum alloy, stainless steel, brass, etc., and information is taken in and out of the magnetic disk rotating at high speed via the magnetic head. There is a possibility that the magnetic head or the magnetic disk surface may be damaged by the generated gas or dust. Therefore, it is necessary to completely seal the inside of the container using a gasket or the like.

An example of a gasket that seals the inside of a container of a hard disk drive is described in Japanese Patent Application Laid-Open No. 4-341986. This gasket has a sealing member made of a polymer elastic material integrally provided on both sides of a core plate by vulcanization bonding, and seals the inside of the container by interposing it between the body and the cover of the container. Can be done.

However, since a core plate for holding the seal member is required in addition to the seal member made of a polymer elastic material, the number of parts increases, and processing and assembly are troublesome.

[0005] Further, since the seal between the core plate and the main body must be sealed by one seal member, and the seal between the core plate and the cover must be sealed by the other seal member, the entire space between the main body and the cover must be sealed. It has to be tightened evenly, and it takes a lot of time and labor to assemble, and also takes time to position between the main body and the cover.

Further, when the container is disassembled for inspection or the like, if the sealing member adheres to the cover or the main body and is forcibly peeled off, the core plate having no strength is bent and cannot be reused. .

The present invention solves the above-mentioned problems of the prior art. The number of parts is small, positioning is simple, machining and assembly are simple, and assembly and
It is an object of the present invention to provide a gasket that can be reused even after repeated disassembly and that can achieve perfect sealing.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a gasket for sealing between a main body and a cover attached to the main body. A base provided integrally, a connecting portion integrally provided in a plurality of through holes provided in a sealing surface of the cover, and both ends integrally connected to the bases, and a base on the sealing surface side. A means is provided which is integrally provided and has a bead portion protruding in the direction of the main body and having a tip portion abutting on a sealing surface of the main body. Further, the ratio (H / B) of the height (H) from the sealing surface of the cover to the top of the bead portion and the width (B) of the base on the sealing surface side was set to H / B <1. Means. Further, a means is employed in which each through hole in the seal surface of the cover is formed by punching from the seal surface side to the back surface side.

[0009]

According to the present invention, a base is provided on the sealing surface and the back surface of the cover by employing the means described above, and both bases are integrally connected via a connecting portion provided in a through hole of the cover. Since the bead portion is provided at the base on the sealing surface side, the gasket can be interposed at a predetermined position between the main body and the cover only by attaching the cover to the main body. The gasket is sealed with the cover by the gasket being provided integrally with the cover, while the gasket is provided integrally with the cover by contacting the tip of the bead portion with the body. Become.

[0010]

Embodiments of the present invention shown in the drawings will be described below. 1 to 8 show an embodiment of a gasket according to the present invention. A gasket 1 according to this embodiment seals the inside of a container for accommodating a magnetic disk or a magnetic head of a hard disk drive. This is provided on the cover 8 side of the container.

The container is made of a material such as a stainless steel plate having an open upper portion for accommodating a magnetic disk, a magnetic head, and the like, an aluminum alloy plate, a brass plate, an SPC plate, and the like, the surface of which is plated with nickel or the like. Box-shaped body 1 to be formed
4 and a plate-shaped cover 8 attached to the opening of the main body 14 and closing the opening.

A plurality of screw holes 16 are provided in the periphery of the opening of the main body 14, and screws (not shown) into which the cover 8 is inserted are screwed into the screw holes 16 to tighten them.
The cover 8 is attached to the opening of the main body 14. A sealing surface 15 having a predetermined width is provided over the entire periphery of the screw hole 16 of the main body 14.
By contacting a part of the gasket 1 of this embodiment to the part 5, the space between the main body 14 and the cover 8 is sealed over the entire circumference.

The cover 8 is formed of a material such as a stainless steel plate, an aluminum alloy plate, a brass plate, an SPC plate or the like, the surface of which is plated with nickel or the like, and is formed into a predetermined shape by press working. 14 is formed in a shape that matches the opening. Main body 1 at the periphery of cover 8
4 is provided in a portion corresponding to the screw hole 16 with a screw insertion hole 9 penetrating therethrough. A screw (not shown) inserted into the screw insertion hole 9 is inserted into the screw hole 16 of the main body 14. The cover 8 is attached to the opening of the main body 14 by screwing and tightening.

A portion corresponding to the sealing surface 15 of the main body 14 inside the screw insertion hole 9 of the cover 8 is provided with a sealing surface 10 having a predetermined width over the entire circumference.
The seal surface 10 is provided with a plurality of through holes 12.

The through hole 12 is formed by punching the cover 8 from the sealing surface 10 side to the back surface 11 side by press working, and is formed to be smaller than the width of the sealing surface 10 of the cover 8. I have. The shape of the through hole 12 can be a circle, an ellipse, a triangle, a square, a hexagon, or any other known shape (a circle in this embodiment).

The punching direction of the through hole 12 is
The reason for setting the direction from the side to the back surface 11 side is that, because the droop R13 formed by punching can be on the sealing surface side, for example,
Even if the gasket once rises from the cover surface due to mold release resistance during mold release after rubber molding, the gasket lands on the cover surface according to who R when returning to the original position, and the adhesion between the rubber and the cover is impaired. Because there is no. That is, when punching from the back surface 11 side to the seal surface 10 side, the droop R13 can be formed on the back surface, and conversely, the edge can be formed on the seal surface side. This is because the adhesion is poor, and the sealing performance is impaired (FIGS. 7 and 8).
reference). The same effect can be obtained by providing a radius and a chamfer by additional processing instead of the droop R by pressing.

The interval between the through holes 12 is preferably about two to three times the maximum width of the gasket 1. If the width is too large, the portion without the through-hole 12 is pulled inward by the shrinkage after molding, and the gasket 1 becomes the original sealing surface 1.
This is because it is shifted from zero. It should be noted that there is no problem even if the interval is smaller than this in a place having a large curvature, such as a corner portion, but if the interval is too narrow, the number of through holes 12 increases, and the number of processing steps increases. Therefore, it is necessary to set the interval in consideration of this point.

Then, the cover 8 configured as described above is mounted in the molding die 17 to form a cavity 19 communicating with the seal surface 10 and the back surface 11 of the cover 8 through the through hole 12. The injection port 18 is located right above a part of the through hole 12 of the through hole 12, and the molding material is filled into the cavity 19 from the injection port 18 and cured, whereby
The gasket 1 according to this embodiment is formed integrally with the cover 8. It is preferable that the cover 8 and the molding material are fixed without an adhesive, and it is possible to prevent the gas discharged from the adhesive from contaminating the magnetic disk and the like.

In this case, the through hole 1 corresponding to the injection port 18
2 is formed larger than the other through holes 12. This is because when the runner part 20 is separated from the product part 21 at the injection point by the mold release, the product part 21 may be damaged due to a tensile force acting on the product part 21. This is because it is necessary to set an intensity that does not occur. Therefore, the strength may be increased by chamfering the through hole 12 corresponding to the injection port 18 or providing a radius. Further, the injection port 18 is connected to the through hole 12.
May be provided in the middle of two adjacent through holes 12 and 12 to inject the molding material. In this case, since the distance over which the molding material moves after the injection increases, it is necessary to ensure a sufficient injection pressure.

The gasket 1 formed integrally with the cover 8 as described above is provided with bases 2 and 3 having a rectangular cross section and provided integrally on the sealing surface 10 and the back surface 11 of the cover 8 with a predetermined width. It is provided integrally in each through hole 12 of the cover 8, and is provided integrally with a cylindrical connecting portion 4 whose both ends are integrally connected to the bases 2 and 3, and an upper portion of the base 2 on the sealing surface 10 side. And a bead portion 5 having a triangular cross section. With this configuration, since the deformation of the bead portion 5 is supported by the base portion, the contact of the bead portion 5 with the cover 8 is stabilized. Further, the base 3 may or may not be continuous. If they are not continuous, molding material is saved. The bead portion 5 of the gasket 1
A groove 6 may be provided in the upper part of the frame (see FIG. 9).

The material of the gasket 1 is preferably a rubber-like elastic material such as ethylene propylene rubber (EPDM) or fluoro rubber (FKM). Depending on the application, acrylic rubber, butyl rubber, or other known rubber-like elastic materials may be used. Can also be used.

The ratio (H / B) of the height (H) from the sealing surface 10 of the cover 8 of the gasket 1 to the top of the bead portion 5 and the width (B) of the base 2 of the cover 8 on the sealing surface 10 side. Is
H / B <1 is set. This is to improve the seating of the bead portion 5 to prevent the bead portion 5 from falling down at the time of assembling, and to ensure the sealing performance. The top of the bead portion 5 is formed on a radius surface having a predetermined curvature in order to enhance sealing performance. In addition, bead part 5
Is not limited to a triangular cross section, but may be a quadrangle, a circle, a trapezoid, or the like, but it is necessary to satisfy the condition of H / B <1 described above.

Then, the cover 8 integrally formed with the gasket 1 is attached to the main body 14, a screw is inserted into the screw insertion hole 9 of the cover 8, and the screw portion is screwed into the screw hole 16 of the main body 14. By tightening, the cover 8 is attached to the main body 14, and the tip of the bead portion 5 of the gasket 1 abuts against the sealing surface 15 of the main body 14 to seal the gap therebetween.

In the gasket 1 according to this embodiment having the above-described configuration, the gasket 1 is formed integrally with the cover 8. 14 can be interposed at a predetermined position. Therefore, the positioning of the gasket 1 is simplified, and the assembly is also simplified.

Further, since the bead portion 5 of the gasket 1 is more easily seated, the bead portion 5 does not fall between the main body 14 and the cover 8 so that the sealing property is not impaired. Will be obtained.

Further, even if the bead portion 5 of the gasket 1 is compressed between itself and the main body 14, since the droop R13 of the through hole 12 is on the sealing surface side, the gasket once rises due to the release resistance at the time of release, for example. Even if it does, the seating at the time of landing is good, and the reliability and sealability can be greatly improved.

Since the gasket 1 is integrally provided on the high-strength cover 8 side, the bead portion 5 of the gasket 1 adheres to the main body 14 side when disassembled, so that the cover 8 is forcibly peeled off. Does not bend, and can be reused even after repeated disassembly and assembly.

[0028]

According to the present invention, as described above, the gasket is provided integrally with the cover, so that the gasket can be interposed at a predetermined position between the main body and the cover only by attaching the cover to the main body. Can be done. Therefore, the positioning of the gasket is simplified, and the assembly is also simplified. In addition, the gasket has a base located on both sides of the cover, a connecting part connecting the two bases, and a bead located on the base on the sealing surface side of the cover. It will be held firmly. Therefore, if the tip of the bead is adhered to the main body side during disassembly, the strong cover will not bend even if it is forcibly peeled off. Can be economical. Furthermore, by setting the ratio of the height from the sealing surface to the top of the bead portion to the width of the base on the sealing surface side to be H / B <1, the seating of the bead portion is improved.
Therefore, since the bead portion does not fall between the main body and the cover, good sealing properties can be obtained. And, since the through hole of the cover is formed by punching from the sealing surface side to the back surface side, since the droop R formed by punching formed in the through hole is on the sealing surface side, for example, the gasket is released due to release resistance at the time of release. Even if it is once lifted, it has excellent effects such as good sitting when landing, and significant improvement in sealability and reliability.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a gasket according to the present invention, showing a state where the gasket is attached to a cover of a container.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a plan view of the cover shown in FIG. 1;

5 is a plan view of a main body of the container to which the cover shown in FIG. 1 is attached.

FIG. 6 is an explanatory view showing a method of forming the gasket shown in FIG.

FIG. 7 is an explanatory diagram showing a good example of a punching direction of a through hole of a cover.

FIG. 8 is an explanatory diagram showing an example in which a punching direction of a through hole of a cover is poor.

FIG. 9 is a sectional view showing a gasket according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gasket 2, 3 ... Base 4 ... Connection part 5 ... Bead part 6 ... Groove 8 ... Cover 9 ... Screw insertion hole 10 ... Seal surface 11 ... Back surface 12 ... Through hole 13 Who R 14 Body 15 Seal face 16 Screw hole 17 Mold 18 Injection port 19 Cavity 20 Runner part 21 Product part 22 Edge

Claims (3)

[Claims] 1. A gasket for sealing between a main body and a cover attached to the main body, the base being provided integrally with a seal surface and a back surface of the cover, and a plurality of gaskets provided on the seal surface of the cover. A connecting portion integrally provided in the through hole, both ends of which are integrally connected to the two base portions, and a connecting portion integrally provided on the base portion on the sealing surface side, and a tip portion protruding in the direction of the main body and having a tip portion of the main body. A gasket comprising a bead portion that comes into contact with a sealing surface. 2. The ratio (H / B) of the height (H) from the sealing surface of the cover to the top of the bead portion to the width (B) of the base on the sealing surface side is H / B <1. 2. The gasket according to claim 1, wherein the gasket is set to: 3. The gasket according to claim 1, wherein each through hole in the seal surface of the cover is formed by punching from the seal surface side to the back surface side.