JP3344643B2 - gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket as a kind of a sealing device, and more particularly, to a gasket suitable for being incorporated in a car cooler compressor or the like.

[0002]

2. Description of the Related Art Conventionally, there has been known a soft metal gasket in which a sealing portion having a predetermined width is provided on a substrate, and a bead is provided in the sealing portion.

[0005] As shown in FIG. 5, a bead 52 is formed on a left and right flat portion 5 in a seal portion 51 having a predetermined width w _1.
3 and 54 are provided at the center of the bead as a full bead. When the seal portion 51 is clamped from above and below by a housing (not shown), the bead 52 is attached to the upper housing at the top 52a. At the same time, the left and right flat portions 53 and 54 are in close contact with the lower housing on the lower surface thereof to seal the sealed fluid. To elastic deformation as crushed this time sandwiched between upper and lower housing, the flat portions of the left and right from the width w ₁ of the seal portion 51 5
3,54 width w ₃ of the bead 5 of w ₄ the width w ₂ which is obtained by subtracting
It is two only, i.e. elastically deformed so that the seal portion 51 is crushed in a part of the width w _1. In FIG. 5, the boundary between the bead 52 and the left and right flat portions 53 and 54 forms a gentle arc and is smoothly connected to each other. However, as another conventional example, as shown in FIG. In some cases, the boundary between the right and left flat portions 53 and 54 is angular (see Japanese Utility Model Application Laid-Open No. 63-121863).

In recent years, as a gasket provided with a full bead of this type, as disclosed in Japanese Utility Model Laid-Open No. 4-125682, a gasket for a compressor in which a retainer portion of a reed valve is integrally provided in a plane of a substrate. In such a gasket, in order to sufficiently secure the strength of the retainer portion, the thickness of the substrate cannot be so thin, and the thickness of the substrate is approximately 0.6 mm in actual size.
It is set to 1.0 mm. This value belongs to a relatively thick category as a soft metal gasket.

In such a relatively thick gasket having a substrate thickness of 0.6 mm or more, if the bead 52 is provided only in a part of the width w ₁ of the seal portion 51 as described above, the bead 52 There greater rigidity of the bead 52 in narrower width w ₂ in spite of its height h _1, thus the bead 5
2 may exceed the tightening force. Therefore, in such a case, the bead 52 is not easily crushed, and the amount of compression of the bead 52 is insufficient, so that sufficient sealing performance may not be exhibited.

In addition, since the bead 52 is hard to be crushed, the residual height of the bead 52 in the mounted state is high, so that a large mounting gap is generated between the upper and lower housings. The force may be reduced, or air, which is a sealed fluid, may leak from the gap.

Further, in recent years, the demand for high output and low cost of a car cooler compressor has tended to reduce the thickness and weight of the housing, reduce the rigidity of the housing, and increase the fluctuation of the housing during operation. If the housing does not follow the fluctuation of the housing with a bead structure that is easily crushed and has a spring force, the sealing performance may be further impaired.

[0008]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a bead that can be easily crushed and has a sufficient spring force even when the substrate is relatively thick, and thus has excellent sealing performance. An object of the present invention is to provide a gasket capable of exhibiting the following.

[0009]

According to a first aspect of the present invention, there is provided a gasket for a compressor in which a reed valve retainer is integrally provided in a plane of a substrate. An inner peripheral side seal portion is provided around the retainer portion, and an outer peripheral side seal portion is provided at an outer peripheral edge of the substrate, and the both seal portions have a bead having the same width dimension and a substantially circular arc cross section. And the beads are provided over the entire width of the seal portion .

[0010]

[0011]

In the gasket according to the first aspect of the present invention, the bead has a substantially arc-shaped cross section, and the bead having a substantially arc-shaped cross section is provided over the entire width of the seal portion. Therefore, the flat portion is omitted from the seal portion in the above-described conventional technology, and the
The ratio of the width of the bead to the height of the bead becomes larger than before. Therefore, it is possible to provide a bead structure that is easily crushed and has a sufficiently large spring force.

Further, in the gasket according to the second aspect of the present invention having the above structure, the bead has a substantially arc-shaped cross section, and the end of the bead having a substantially arc-shaped cross section has a widthwise end portion. Since the planar shape is defined, the flat portion is omitted from the seal portion in the above-described conventional technique, and the ratio of the width of the bead to the height of the bead becomes larger than that in the related art. Therefore, it is possible to provide a bead structure that is easily crushed and has a sufficiently large spring force.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A metal substrate is provided with a seal portion having a predetermined width, a bead is provided in the seal portion, and the bead is formed to have a substantially arc-shaped cross section. The cross-section of a substantially arc shape includes a part of a perfect circle, a part of an ellipse, and a part of an ellipse, as well as all shapes formed when a metal seal is curved in its thickness direction. A gasket that is included and has a seal without a flat portion next to a bead of such cross-sectional shape is the subject of the present invention.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is a common embodiment for the invention according to claim 1 and the invention according to claim 2.

As shown in FIGS. 1 to 3, the gasket according to this embodiment has a five-piece reed valve retainer portion 2 radially and integrally formed at the center of a substrate (also referred to as a base material) 1 having a substantially circular plane. And a gasket for a car cooler compressor provided in the above, wherein the substrate 1 made of soft metal has an actual size of about 0.84 mm in thickness. Further, in this gasket, an inner peripheral side sealing portion 5 is provided around the retainer portion 2 so as to partition the plane of the substrate 1 into a high pressure chamber portion 3 on the inner peripheral side and a low pressure chamber portion 4 on the outer peripheral side. Separately, an outer peripheral side seal portion 6 is provided on the outer peripheral edge of the substrate 1. In the figure, the one-dot chain line indicates the center line of the inner peripheral side seal portion 5, and the two-dot chain line indicates the center line of the outer peripheral side seal portion 6. Reference numerals 7 and 8 denote punching portions, respectively, and reference numeral 9 denotes a plate-shaped connecting portion connecting the inner peripheral side sealing portion 5 and the outer peripheral side sealing portion 6.

The inner peripheral side seal portion 5 and the outer peripheral side seal portion 6 have the same width w ₁ (about 3 to 4 mm in actual size).
Further, they have the same cross-sectional shape. That is, beads 10 and 11 are provided respectively, and the beads 10 and
11 is formed into a substantially arc shape, respectively, the bead 10 and 11 exhibits a cross section arcuate is provided over the entire width w ₁ of each seal portions 5 and 6, respectively, also the bead 10, The widthwise ends 10a and 11a of the gasket 11 together with the edge of the retainer 2 and the edge of the connecting portion 9 define the planar shape of the gasket. The seal portions 5 and 6 are not provided with flat portions as in the related art.

In the gasket having the above configuration,
Beads 10 and 11 provided on the inner peripheral side seal portion 5 and the outer peripheral side seal portion 6 each have a substantially arc-shaped cross-section, and the beads 10 and 11 each have a substantially arc-shaped cross-section. 6 over the entire width w ₁ ,
In other words, the widthwise ends 10a and 11a of the beads 10 and 11 together with the edges of the retainer portion 2 and the edges of the connecting portion 9 define the planar shape of the gasket. Since the conventional flat portions are not provided, as shown in FIG. 4, when the seal portions 5 and 6 are sandwiched between the housings 21 and 22 from above and below, the entire seal portions 5 and 6 are crushed. Will be elastically deformed. Therefore, bead 10,
The ratio of the width w ₂ of the bead 10, 11 to the height h ₁ of the 11 becomes larger than the conventional, thereby easily collapse, while it is possible to provide a bead structure with a spring force of sufficient magnitude, This makes it possible to provide a gasket that exhibits excellent sealing performance and has high reliability in sealing performance.

As shown in FIG. 4, the height h ₂ of the residual bead in the mounted state is reduced, and the height of the upper and lower housings 2 is reduced.
Since a mounting gap is hardly generated between the mounting bolts 1 and 22, it is possible to prevent a reduction in the axial force of the tightening bolt and the occurrence of an air leak, and to reduce a torque, a base material crack, a rubber flow, and the like due to vibration. Can be prevented.

Further, since the gasket exhibits excellent sealing performance, the thickness and weight of the housing of the car cooler compressor can be further promoted.

In the above embodiment, the retainer 2
Both the inner peripheral side seal portion 5 provided around and the outer peripheral side seal portion 6 provided on the outer peripheral edge of the substrate 1 have a bead structure according to the present invention, but only one of the bead structures according to the present invention. A bead structure may be used. Further, the number and planar layout of the seal portions 5 and 6 and the structure and presence or absence of the retainer portion 2 are not limited, and the planar layout of the entire gasket is not particularly limited.

[0021]

The present invention has the following effects.

That is, in the gasket according to the first or second aspect of the present invention having the above configuration, the bead provided on the seal portion having a predetermined width has a substantially arc-shaped cross section, and has a substantially circular cross section. The bead in the form of an arc is provided over the entire width of the seal, or the widthwise end of the bead defines the planar shape of the gasket, and the seal has a conventional flat surface. Since the seal portion is not provided, the seal portion is elastically deformed so as to be crushed when the seal portion is sandwiched by the housing. Accordingly, the ratio of the width of the bead to the height of the bead becomes larger by this amount, which makes it easy to collapse, and on the other hand, provides a bead structure having a sufficiently large spring force. It is possible to provide a gasket that exhibits excellent sealing performance and has high reliability in sealing performance.

Further, since the height of the residual bead in the mounted state is reduced and a mounting gap is hardly generated between the housings, it is possible to prevent a decrease in the axial force of the tightening bolt and an air leak. It is possible to prevent the occurrence of torque reduction, base material cracking, rubber flow, and the like.

Further, since the gasket exhibits excellent sealing performance, the thickness and weight of the housing of the car cooler compressor can be further promoted.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is an enlarged sectional view of a seal portion.

FIG. 4 is an enlarged sectional view showing a mounted state of a seal portion.

FIG. 5 is a sectional view of a seal portion of a gasket according to a conventional example.

FIG. 6 is a sectional view of a seal portion of a gasket according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Retainer part 3 High-pressure chamber part 4 Low-pressure chamber part 5 Inner peripheral side seal part 6 Outer peripheral side seal part 7,8 Punching part 9 Connecting part 10,11 Bead 10a, 11a End part 21,22 Housing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-125682 (JP, U) JP-A-58-89647 (JP, U) JP-A 58-97353 (JP, U) JP-A 6-97353 40389 (JP, U) Jikken 43-20659 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15/08 F04B 39/00 104

Claims (1)

(57) [Claims] 1. A gasket for a compressor in which a reed valve retainer (2) is integrally provided in a plane of a substrate (1), wherein an inner peripheral side seal portion (5) is provided around the retainer portion (2) radially arranged. ) Is provided, and an outer peripheral side seal portion (6) is provided on the outer peripheral edge of the substrate (1). The two seal portions (5) and (6) have the same width dimension (w ₁ ) and are substantially circular in cross section. Beads with arc shape (10) (11)
Having the same cross-sectional shape as each other,
Gaskets characterized by being provided over the entire width (w ₁ ) of the seal portions (5) and (6).