JPH04289578A - Sealed construction using packing - Google Patents

Abstract

PURPOSE:To reduce assembly and processing cost of the device which keeps an air tight condition by packing placed between a case and its cover. CONSTITUTION:A case 1 is provided with a roughly sized projection on a recess 7 on the packing surface beforehand by means of diecasting on the like. On top of this, a sheet packing 3 is placed and a cover 2 is placed on top of it. A cover 2 is also provided with the roughly sized recess 7 on the packing surface beforehand by means of diecasting on the like fastening the cover 2 to the case 1 by screws 4, a sheet packing 3 is deformed, biting into the recess 7 placed on the case 1 and the cover 2 and forms a projection part of the packing 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a structure having a case and a cover, and the inside of which must be kept airtight.
The object of the present invention is to provide a product structure for reducing the assembly and processing costs of a device that maintains airtightness by providing a packing between a case and a cover.

0002

[Prior Art] A structure such as a magnetic disk drive shown in FIG. 6, in which a packing 3 is sandwiched between a case 1 and a cover 2 and assembled by tightening with screws, etc., must maintain the confidentiality of the packing part. There are cases. In response to such requests, generally sheet packing 3 or O
A structure using a ring packing 6 is often adopted.

That is, the sheet packing 3 and the cover 2 are placed on the mating surface of the case 1 (the packing 3 may be fixed in advance to the flat surface of the case 1 or the cover 2 with adhesive or the like), and then By tightening the case 1 with a large number of screws 4, an airtight chamber 10 is formed inside the case and the cover. Or, as shown in Figure 7, place O on the mating surface of case 1.
Place the ring packing 6, place the cover 2 with a dimensionally highly accurate U-shaped groove 5, and fit the O-ring 6 into the U-shaped groove 5 (or fix the O-ring to the U-shaped groove 5 with adhesive or the like in advance). In some cases, the case 1 is fastened to the case 1 with a large number of screws 4 to form an airtight chamber 10. In the structural example shown in Figure 6, after tightening the screws, the packing may slip and be pushed out toward the outdoor side or the indoor side, causing packing displacement.To counter this, it is possible to use a large number of screws and reduce the pitch interval between the screws, or to A sealant or adhesive is often applied to the entire surface. In the structure example shown in Fig. 7, the cover 2 has a U-shaped groove 5 for using an O-ring, and the dimensions determined for each O-ring used are set to a high-precision dimensional tolerance and a high-precision finished surface. The precision is given by machining.

[0004] The above structure generally provides the airtight function required of the packing portion.

[0005]

[Problem to be solved by the invention] The above conventional structure is shown in FIG.
In the case of the above example, if adhesive is not used, packing misalignment 9 may occur between the screws, making it impossible to maintain airtightness at the packing part, or it may protrude inside or outside, causing damage to the surrounding area. This may cause problems such as contact. In order to prevent this, it is necessary to fix the packing to the case 1 or the cover 2 in advance, but this requires adhesive application work and drying work, which raises the problem of increased work costs. Therefore, one common problem in these cases is to provide a structure that realizes assembly so that the packing 3 does not shift.

Furthermore, in the example shown in FIG. 7, as mentioned above, the U-shaped groove 5
Since high-precision surface machining is required, there is a problem in that the machining cost increases. Furthermore, the parts cost of the O-ring itself is expensive. The challenge in this regard is to provide a structure that eliminates the need for high-precision machining of the U-shaped groove 5 and does not use expensive parts such as the O-ring 6.

Furthermore, in addition to the cost problem, these structures also have drawbacks such as the fact that they require careful attention to the work, making it difficult for anyone but an expert to work on.

[0008] An object of the present invention is to provide a product structure that does not have the above-mentioned problems.

[0009]

[Means for Solving the Problems] According to the present invention, at least one of the case and the cover is provided with a convexity or a concavity along the mating surface that contacts the packing material, so that a part of the packing can be formed by the convexity or concavity during screw tightening. Since it bites into the recess and gets caught, the sandwiched packing becomes difficult to shift in the direction perpendicular to the fastening direction at the contact surface. As a result,

0010

[Function] (1) After tightening the screws, the packing becomes difficult to shift toward the airtight chamber side or outside, and the packing does not shift. Therefore, there is no need to previously fix the packing material to the case or cover with an adhesive or the like.

(2) Rough protrusions or depressions to be provided on at least one of the case and the cover need only be provided during part processing by die-casting, molding, or casting, and additional work such as high-precision U-groove machining is required. There is no need to do so.

0012

[Embodiment] An embodiment of the present invention will be explained below with reference to FIG.

A dimensionally rough recess 7 is previously formed in the case 1 by die-casting or the like along the packing mounting surface. The packing mounting surface of case 1 is machined flat as before. The sheet packing 3 is placed on top of this, and the cover 2 is placed on top of it. The cover 2 is also preliminarily provided with a dimensionally rough recess 7 along the packing surface by die-casting or the like. The packing mounting surface of the cover 2 is also flattened as before. By tightening the cover 2 to the case 1 with the screws 4, the sheet packing 3 is deformed as shown in FIG. let Therefore, the sheet packing 3 becomes difficult to slip on the packing contact surfaces of the case 1 and the cover 2, and the packing does not shift.

Similar effects can be obtained by using the shapes of the protrusions or recesses previously provided on the case 1 or the cover 2 as shown in FIGS. 3 to 5.

[0015]

[Effect of the invention] According to the present invention, the case 1 and the cover 2
Convex or concave part 7 on at least one of the packing mounting surfaces of
By providing this, the packing material is prevented from shifting, so there is no need to adhere the packing material to the case or cover in advance, and the work cost can be saved. Even when a sealant or adhesive is applied to the packing or mating surfaces, since the packing is not completely removed, there is no need for drying time or heating time for adhesion, which can save time. Also, compared to using O-ring packing,
This eliminates the need for highly accurate machining of O-ring grooves and requires no other precise bonding and assembly work, so even unskilled workers can perform the assembly work.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of an embodiment of the present invention;

FIG. 3 is a perspective view showing another example of the shape of the second embodiment according to the present invention;

FIG. 4 is a perspective view showing another example of the shape of the third embodiment of the present invention;

FIG. 5 is a perspective view showing another example of the shape of the fourth embodiment according to the present invention;

FIG. 6 is a perspective view of a first example showing a conventional structure example;

[Figure 7]
A perspective view of a second example showing a conventional structure example,

FIG. 8 is a perspective view of a magnetic disk device to which the present invention is applied.

[Explanation of symbols]

1...Case, 2...Cover, 3...Seat packing, 4...Screw, 5...U-shaped groove, 6...O-ring packing, 7...Dent, 8
...Protrusion part, 9...Packing deviation part, 10...Airtight chamber.

Claims (2)

[Claims] [Claim 1] A packing is interposed between the case and the cover,
A device for maintaining the airtightness of an intervening part, wherein a sealing structure uses a packing, characterized in that a dimensionally rough recess or protrusion is provided on at least one of the mounting surface of the packing of the case and the cover. 2. A hard disk drive device to which claim 1 is applied.