JP6948911B2 - gasket - Google Patents

Description

The present invention relates to gaskets.

For example, a large case such as a battery case, an inverter case, or a fuel cell stack storage case of an electric vehicle has a case body and a cover, and the cover is attached to the case body. In such a case, a gasket for sealing the gap between the case body and the cover is arranged (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-122536

The gasket described in Patent Document 1 is, for example, first formed in a straight line with a rubber material or the like, and the ends are joined to form an annular shape, and a part thereof is formed so as to have a shape along the outer shape of the case body and the cover. A curved portion is provided. The curved portion of such a gasket is in a deformed state in which the outer peripheral side is pulled in the outer peripheral direction and stress is applied so that the inner peripheral side contracts in the inner peripheral direction. Therefore, when the gasket is sandwiched between the case body and the cover, the curved portion may be less likely to be elastically deformed than the straight portion. In this case, there may be a difference in the degree of sealing between the straight portion and the curved portion of the gasket.

The present invention has been made in view of the above, and an object of the present invention is to provide a gasket capable of ensuring a uniform seal.

The gasket according to the present invention is an annular gasket that is arranged between a first member and a second member mounted on the first member and seals a gap between the first member and the second member. From the outer peripheral side base portion which is annular and has a concave portion all around the outer peripheral portion, the annular first lip portion protruding from the outer peripheral side base portion to the first member side and the outer peripheral side, and the outer peripheral side base portion. An outer peripheral side seal portion having an annular second lip portion protruding toward the second member side and the outer peripheral side, an inner peripheral side base portion having an annular shape and arranged on the inner peripheral side of the outer peripheral side seal portion, and the said. An inner peripheral side sealing portion having a stress absorbing portion which is arranged inside the inner peripheral side base portion and absorbs a part of the stress applied to the inner peripheral side base portion, the outer peripheral side sealing portion, and the inner peripheral side sealing portion. It is arranged between the two, and includes a connecting portion that connects the outer peripheral side base portion and the inner peripheral side base portion.

In the above gasket, the stress absorbing portion may be a hollow portion provided all around the inside of the inner peripheral side base portion.

In the above gasket, the inner peripheral side base portion may be cylindrical.

In the gasket, the first lip portion is connected to the first outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base portion and the inner peripheral portion of the outer peripheral side base portion, and is connected to the tip side in the protruding direction. 1 It has a first inner peripheral surface inclined toward the outer peripheral surface side, and the second lip portion has a second outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base portion and an inner circumference of the outer peripheral side base portion. It may have a second inner peripheral surface having a shape connected to the portion and inclined toward the tip side in the protruding direction toward the second outer peripheral surface side.

According to the present invention, it is possible to provide a gasket capable of ensuring a uniform seal.

FIG. 1 is a perspective view showing an example of a gasket according to the present embodiment. FIG. 2 is a diagram showing a shape along a cross section taken along the line AA in FIG. FIG. 3 is a diagram showing a shape along a BB cross section in FIG. FIG. 4 is a cross-sectional view showing a state in which the curved portion of the gasket is sandwiched between the case body and the cover.

Hereinafter, embodiments of the gasket according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

FIG. 1 is a perspective view showing an example of the gasket 100 according to the present embodiment. The gasket 100 shown in FIG. 1 is arranged between the case main body 201 and the cover 202 in the case 200 having the case main body 201 and the cover 202. When the cover 202 is attached to the case body 201, the first surface Sa of the case body 201 and the second surface Sb of the cover 202 face each other. The gasket 100 seals the gap between the first surface Sa of the case body 201 and the second surface Sb of the cover 202 while being sandwiched between the case body 201 and the cover 202. Note that FIG. 1 shows a state in which the gasket 100 is placed on the case body 201 and the cover 202 is removed from the case body 201.

In the present embodiment, the case 200 is a large case having a peripheral length of, for example, about 5 m. Examples of such a case 200 include a battery case of an electric vehicle, an inverter case, a fuel cell stack storage case, and the like. In the present embodiment, the case 200 (case body 201 and cover 202) has an octagonal outer shape as an example, but the present invention is not limited to this, and a polygonal shape such as a quadrangle or a hexagon may be used. However, it may be circular or elliptical. Further, in FIG. 1, the case main body 201 and the cover 202 are shown as a thick box-shaped structure, but the present invention is not limited to this, and at least one of the case main body 201 and the cover 202 may be plate-shaped.

At least one of the case body 201 and the cover 202 of the case 200 is provided with positioning portions such as grooves or protrusions for positioning the gasket 100. In the present embodiment, a configuration in which the case main body 201 is provided with the groove-shaped positioning portion 201a will be described as an example. The positioning portion 201a is formed along the outer circumference of the case main body 201, and its bottom surface is flat and parallel to the first surface Sa. The width direction of the positioning portion 201a (the direction parallel to the bottom surface of the positioning portion 201a and orthogonal to the extending direction of the positioning portion 201a) is set to a dimension capable of accommodating the gasket 100. The gasket 100 is housed in the positioning portion 201a and is arranged in a state following the positioning portion 201a. The positioning unit 201a may not be provided.

The gasket 100 is formed in a band shape using, for example, a rubber material, and is provided in an annular shape along the outer circumference of the case 200. Examples of the rubber material constituting the gasket 100 include nitrile rubber, acrylic rubber, EPDM, CR, silicone rubber, fluororubber, and natural rubber.

Hereinafter, in explaining the configuration of the gasket 100, the side on which the case body 201 is arranged with respect to the gasket 100 is referred to as the case body 201 side by taking the case provided in the case 200 of the present embodiment as an example, and the cover 202. The side on which is placed is referred to as the cover 202 side. Further, the case body 201 side may be described as the lower side, and the cover 202 side may be described as the upper side. The positional relationship between the case body 201 and the cover 202 is not limited to the above, and the case body 201 side may be the upper side and the cover 202 side may be the lower side. Further, the case body 201 and the cover 202 are not limited to the configurations arranged vertically, and may have a configuration arranged in the horizontal direction or another direction.

The gasket 100 has a shape corresponding to the outer shape of the case body 201 and the cover 202. In this embodiment, the gasket 100 has an octagonal shape and has eight straight portions 101 and eight curved portions 102. The straight portion 101 is a portion corresponding to the side portions of the case main body 201 and the cover 202. The curved portion 102 is a portion corresponding to a corner portion of the case body 201 and the cover 202. The curved portion 102 is formed in an arc shape, for example, according to the angles of the corners of the case body 201 and the cover 202. The curved portion 102 is not limited to the arc shape, and may have another shape. Further, the gasket 100 is not limited to a shape corresponding to the outer shape of the case body 201 and the cover 202, and may have a configuration in which the entire gasket 100 is curved, for example. Further, the gasket 100 may be deformable according to the outer shapes of the case body 201 and the cover 202.

FIG. 2 is a diagram showing a shape along a cross section taken along the line AA in FIG. FIG. 2 shows the vertical cross-sectional shape of the straight portion 101 of the gasket 100. In the present embodiment, the vertical cross-sectional shape refers to a cross section cut in a plane orthogonal to the direction in which the gasket 100 extends. As shown in FIG. 2, the gasket 100 includes an outer peripheral side sealing portion 10, an inner peripheral side sealing portion 20, and a connecting portion 30. The outer peripheral side seal portion 10, the inner peripheral side seal portion 20, and the connecting portion 30 are each annular, and the outer peripheral side sealing portion 10, the connecting portion 30, and the inner peripheral side sealing portion 20 are arranged in this order from the outer peripheral side to the inner peripheral side. Will be done. Therefore, the gasket 100 is stably supported without falling to the outer peripheral side or the inner peripheral side.

The outer peripheral side seal portion 10 has an outer peripheral side base portion 11, a first lip portion 12, and a second lip portion 13. The outer peripheral side base portion 11 is annular and has a recess 11a in the outer peripheral portion. The recess 11a is provided on the outer peripheral portion of the outer peripheral side sealing portion 10 over the entire circumference. The recess 11a has, for example, an arc shape in a vertical cross-sectional shape.

The first lip portion 12 is annular and projects from the outer peripheral side base portion 11 toward the case main body 201 side and the outer peripheral side. The first lip portion 12 has an outer peripheral surface (first outer peripheral surface) 12a, an inner peripheral surface (first inner peripheral surface) 12b, and a tip portion 12c. The outer peripheral surface 12a is connected to the outer peripheral portion of the outer peripheral side base portion 11. The inner peripheral surface 12b is connected to the inner peripheral portion of the outer peripheral side base portion 11 and has a shape inclined toward the outer peripheral surface 12a toward the tip end side in the protruding direction of the first lip portion 12. The tip portion 12c is arranged at the tip of the first lip portion 12 in the protruding direction, and connects the outer peripheral surface 12a and the inner peripheral surface 12b. The tip portion 12c has a curved shape, but is not limited to this, and may have a shape having a corner portion. As shown in FIG. 2, in a state where the gasket 100 is placed on the groove portion 201a of the case body 201, the first lip portion 12 is tapered toward the tip portion 12c by the outer peripheral surface 12a and the inner peripheral surface 12b. Has a shape. Further, the first lip portion 12 has a shape in which the inner peripheral surface 12b is inclined toward the outer peripheral surface 12a toward the tip end side in the protruding direction, so that the outer peripheral side base portion 11 is on the case body 201 side and the outer peripheral side. Has a protruding shape.

The second lip portion 13 is annular and projects from the outer peripheral side base portion 11 to the cover 202 side and the outer peripheral side. The second lip portion 13 has the same configuration as the first lip portion 12 described above. That is, the second lip portion 13 has an outer peripheral surface (second outer peripheral surface) 13a, an inner peripheral surface (second inner peripheral surface) 13b, and a tip portion 13c. The outer peripheral surface 13a is connected to the outer peripheral portion of the outer peripheral side base portion 11. The inner peripheral surface 13b is connected to the inner peripheral portion of the outer peripheral side base portion 11 and has a shape inclined toward the outer peripheral surface 13a toward the tip end side in the protruding direction of the second lip portion 13. The tip portion 13c is arranged at the tip of the second lip portion 13 in the protruding direction, and connects the outer peripheral surface 13a and the inner peripheral surface 13b. The tip portion 13c has a curved shape, but is not limited to this, and may have a shape having a corner portion. As shown in FIG. 2, in a state where the gasket 100 is placed on the groove portion 201a of the case body 201, the second lip portion 13 has a shape tapered toward the tip by the outer peripheral surface 13a and the inner peripheral surface 13b. Have. Further, the second lip portion 13 has a shape in which the inner peripheral surface 13b is inclined toward the outer peripheral surface 13a toward the tip end side in the protruding direction, so that the outer peripheral side base portion 11 is on the case body 201 side and the outer peripheral side. Has a protruding shape. It has a shape protruding from the outer peripheral side base 11 to the cover 202 side and the outer peripheral side. The shape, dimensions, etc. of the second lip portion 13 may be different from that of the first lip portion 12.

The inner peripheral side seal portion 20 has an inner peripheral side base portion 21. The inner peripheral side base 21 is, for example, cylindrical. The shape of the inner peripheral side base 21 is not limited to a cylindrical shape, and may be a cylindrical shape having another shape such as an elliptical or polygonal cross-sectional shape. A hollow portion 21K is provided inside the inner peripheral side base portion 21.

The stress absorbing portion 22 is arranged on the inner peripheral side base portion 21. The stress absorbing portion 22 absorbs a part of the stress applied to the inner peripheral side base portion 21. In the present embodiment, the hollow portion 21K provided inside the inner peripheral side base portion 21 is the stress absorbing portion 22. That is, when stress is applied to the inner peripheral side base portion 21, the stress absorbing portion 22 deforms the stressed portion toward the hollow portion 21K (stress absorbing portion 22), so that the stress is applied to the connecting portion 30. Suppress transmission to the side. In the present embodiment, the case where the hollow portion 21K is provided in the inner peripheral side base portion 21 and the stress absorbing portion 22 is the hollow portion 21K has been described as an example, but the present invention is not limited to this. For example, the inner peripheral side base portion 21 may be in a solid state, and the stress absorbing portion 22 may be provided in the solid state portion of the inner peripheral side base portion 21. In this case, the stress absorbing portion 22 may be formed of, for example, a rubber material softer than the inner peripheral side base portion 21. Further, the stress absorbing portion 22 is not limited to the configuration arranged inside the inner peripheral side base portion 21, and may be formed by cutting out a part of the inner peripheral side base portion 21, for example, in the cutout portion. A rubber material or the like softer than the inner peripheral side base 21 may be arranged.

The connecting portion 30 is arranged between the outer peripheral side sealing portion 10 and the inner peripheral side sealing portion 20. The connecting portion 30 connects the outer peripheral side base portion 11 and the inner peripheral side base portion 21. The connecting portion 30 has, for example, a plate shape, but is not limited thereto. The connecting portion 30 is arranged on the center position AX in the vertical direction. Therefore, the gasket 100 has a shape in which the upper side and the lower side are symmetrical with respect to the center position AX. Therefore, the gasket 100 may face either the case body 201 in the vertical direction and the cover 202 side. The position of the connecting portion 30 is not limited to the center position AX, and may be biased to the upper side or the lower side with respect to the center position AX.

The connecting portion 30 has an outer peripheral side connecting portion 31 and an inner peripheral side connecting portion 32. The outer peripheral side connecting portion 31 is connected to the outer peripheral side base portion 11. The inner peripheral side connecting portion 32 is connected to the inner peripheral side base portion 21. The outer peripheral side connecting portion 31 has a curved surface extending toward the outer peripheral side base portion 11. The curved surface can be arcuate in vertical cross-sectional shape, for example. The inner peripheral side connecting portion 32 has a curved surface extending toward the inner peripheral side base portion 21 side. The curved surface can be arcuate in vertical cross-sectional shape, for example.

The gasket 100 can be manufactured, for example, by the following process. First, a linear rubber member having a configuration corresponding to each portion of the outer peripheral side sealing portion 10, the inner peripheral side sealing portion 20, and the connecting portion 30 by an extrusion molding method or the like using a rubber material before vulcanization treatment. To form. After that, the rubber member is vulcanized. During this vulcanization treatment, the ends of the rubber members are melted by heat and joined to form an annular gasket 100. After that, the straight portion 101 and the curved portion 102 are formed on the gasket 100 so as to have a shape corresponding to the outer shape of the case body 201 and the cover 202.

FIG. 3 is a diagram showing a shape along a BB cross section in FIG. FIG. 3 shows the cross-sectional structure of the curved portion 102 of the gasket 100. As shown in FIG. 3, the curved portion 102 of the gasket 100 is in a deformed state in which the outer peripheral side is pulled in the outer peripheral direction and stress is applied so that the inner peripheral side contracts in the inner peripheral direction. In addition, in FIG. 3, in order to show the structure of the curved portion 102 in an easy-to-understand manner, the amount of deformation is shown larger than the actual one.

A stress that is pulled in the outer peripheral direction is applied to the outer peripheral side seal portion 10 arranged on the outer peripheral side. Due to this stress, the outer peripheral portion of the outer peripheral side base portion 11 tends to be deformed so as to extend vertically. In the present embodiment, a recess 11a is provided on the outer peripheral portion of the outer peripheral side base portion 11. Therefore, the outer peripheral side base portion 11 is deformed so that the recess 11a opens in the vertical direction. Due to this deformation of the outer peripheral side base portion 11, the first lip portion 12 protrudes downward and the second lip portion 13 protrudes upward without applying an excessive force to the outer peripheral portion of the outer peripheral side base portion 11. do.

Due to the deformation of the outer peripheral side base portion 11, the first lip portion 12 and the second lip portion 13 are oriented toward the inner peripheral side as compared with the straight line portion 101 as shown by the alternate long and short dash line in FIG. 12c and 13c are in a state of protruding toward the outer peripheral side, respectively. Therefore, in each of the straight portion 101 and the curved portion 102, the tip portions 12c and 13c of the first lip portion 12 and the second lip portion 13 are in a state of protruding toward the outer peripheral side.

On the other hand, a stress that contracts in the inner peripheral direction is applied to the inner peripheral side seal portion 20 arranged on the inner peripheral side. Due to this stress, the inner peripheral portion of the inner peripheral side base portion 21 is deformed so as to be crushed toward the hollow portion 21K (stress absorbing portion 22) side. Due to this deformation, the upper end portion of the inner peripheral side base portion 21 protrudes upward, and the lower end portion protrudes downward. In this way, since the stress on the inner peripheral portion of the inner peripheral side base portion 21 is absorbed by the stress absorbing portion 22, the stress is suppressed from being transmitted from the connecting portion 30 to the outer peripheral side sealing portion 10. Therefore, the deformation of the outer peripheral side seal portion 10 due to the stress is suppressed. Further, in the deformed state of the inner peripheral side base portion 21, the hollow portion 21K is maintained inside.

By mounting the cover 202 with the gasket 100 placed on the case body 201, the gasket 100 is sandwiched between the case body 201 and the cover 202. For example, in each of the straight portion 101 and the curved portion 102, the tip portions 12c and 13c of the first lip portion 12 and the second lip portion 13 project toward the outer peripheral side. That is, in the first lip portion 12 and the second lip portion 13, the tip portions 12c and 13c project toward the outer peripheral side, which is the same side, over the entire circumferential direction. Further, in the first lip portion 12, the tip portion 12c is in contact with the case body 201 at a position on the inner peripheral surface 12b side.

When the cover 202 is attached from this state, the cover 202 comes into contact with the position on the inner peripheral surface 13b side of the tip portion 13c of the second lip portion 13 and presses the second lip portion 13 downward. Therefore, in the gasket 100, the position of the tip portion 12c of the first lip portion 12 on the inner peripheral surface 12b side is pressed by the case body 201, and the position of the tip portion 13c of the second lip portion 13 on the inner peripheral surface 13b side is pressed. The position is sandwiched while being pressed by the cover 202. As a result, the first lip portion 12 and the second lip portion 13 are elastically deformed to the outer peripheral side, which is the same side. When the first lip portion 12 and the second lip portion 13 are elastically deformed toward the outer peripheral side over the entire circumferential direction, stable sealing performance is ensured in the outer peripheral side sealing portion 10.

Further, in the inner peripheral side seal portion 20, a stress absorbing portion 22 is formed on the inner peripheral side of the inner peripheral side base portion 21. Therefore, the lower end of the inner peripheral side base 21 is pushed upward by the case body 201 and elastically deformed, and the upper end of the inner peripheral side base 21 is pushed downward by the cover 202 and elastically deformed. Therefore, the inner peripheral side base portion 21 is elastically deformed so as to be crushed in the vertical direction.

FIG. 4 is a cross-sectional view showing a state in which the curved portion 102 of the gasket 100 is sandwiched between the case main body 201 and the cover 202. In the curved portion 102, in a state where the cover 202 is not attached, the inner peripheral side base portion 21 is in a state where the inner peripheral portion is crushed to the outer peripheral side, and a state in which a space is formed in the stress absorbing portion 22 is maintained (). (See FIG. 3). Therefore, when the cover 202 is attached from this state, as shown in FIG. 4, the upper end portion of the inner peripheral side base portion 21 is elastically deformed downward, and the lower end portion of the inner peripheral side base portion 21 is elastically deformed upward. Therefore, the inner peripheral side base portion 21 is in a state of being elastically deformed so as to be further crushed in the vertical direction from the state in which the inner peripheral portion is crushed to the outer peripheral side.

By elastically deforming the inner peripheral side base portion 21 so as to be crushed in the vertical direction, stable sealing performance is ensured in the inner peripheral side sealing portion 20. For example, by adjusting the thickness of the inner peripheral side base portion 21 so that the elastic force of the inner peripheral side base portion 21 is weaker than the elastic force of the first lip portion 12 and the second lip portion 13, the outer peripheral side seal Sufficient deformation is ensured in the inner peripheral side seal portion 20 while mainly the seal in the portion 10. Further, for example, by adjusting the thickness of the inner peripheral side base portion 21 and making the elastic force of the inner peripheral side base portion 21 equal to the elastic force of the first lip portion 12 and the second lip portion 13, the outer peripheral side sealing portion is formed. Equivalent sealing performance is ensured in both the 10 and the inner peripheral side sealing portion 20.

As described above, the gasket 100 according to the present embodiment is arranged between the case main body 201 and the cover 202 mounted on the case main body 201, and the annular gasket 100 that seals the gap between the case main body 201 and the cover 202. The outer peripheral side base portion 11 which is annular and is provided with a recess 11a all around the outer peripheral portion, and the annular first lip portion 12 which protrudes from the outer peripheral side base portion 11 to the case main body 201 side and the outer peripheral side. An outer peripheral side seal portion 10 having an annular second lip portion 13 projecting from the outer peripheral side base portion 11 to the cover 202 side and the outer peripheral side, and an inner circumference arranged on the inner peripheral side of the annular outer peripheral side seal portion 10. An inner peripheral side sealing portion 20 having a side base portion 21 and a stress absorbing portion 22 arranged inside the inner peripheral side base portion 21 and absorbing a part of the stress applied to the inner peripheral side base portion 21, and an outer peripheral side sealing portion. A connecting portion 30 which is arranged between the 10 and the inner peripheral side seal portion 20 and connects the outer peripheral side base portion 11 and the inner peripheral side base portion 21 is provided.

With this configuration, since the outer peripheral side seal portion 10 and the inner peripheral side seal portion 20 are arranged side by side in a state of being connected by the connecting portion 30, it is possible to prevent the gasket 100 from falling to the outer peripheral side or the inner peripheral side. Therefore, the gasket 100 is stably arranged. Further, the gasket 100 can prevent the outer peripheral side sealing portion 10 and the inner peripheral side sealing portion 20 from being elastically deformed at the curved portion 102. Therefore, when the gasket 100 is sandwiched between the case body 201 and the cover 202, the outer peripheral side sealing portion 10 and the inner peripheral side sealing portion 20 are elastic to the same extent in any of the straight portion 101 and the curved portion 102. It will be transformed. As a result, a uniform seal can be ensured over the entire circumferential direction of the gasket 100.

Further, in the gasket 100 according to the present embodiment, the stress absorbing portion 22 is a hollow portion 21K provided around the inside of the inner peripheral side base portion 21. With this configuration, the inner peripheral side sealing portion 20 can more reliably absorb the stress applied to at least the outer peripheral side with respect to the inner peripheral side base portion 21.

Further, in the gasket 100 according to the present embodiment, the inner peripheral side base portion 21 has a cylindrical shape. With this configuration, the inner peripheral side sealing portion 20 can uniformly absorb the stress applied to the inner peripheral side base portion 21 in the circumferential direction of the inner peripheral side base portion 21.

Further, in the gasket 100 according to the present embodiment, the first lip portion 12 and the second lip portion 13 are the outer peripheral surfaces 12a and 13a connected to the outer peripheral portion of the outer peripheral side base portion 11 and the inner peripheral portion of the outer peripheral side base portion 11. It has inner peripheral surfaces 12b and 13b which are connected to and inclined toward the tip side in the protruding direction toward the outer peripheral surfaces 12a and 13a, respectively. Therefore, the first lip portion 12 and the second lip portion 13 have a tapered shape toward the tip. Further, according to this configuration, the first lip portion 12 has a shape protruding from the outer peripheral side base portion 11 to the case body 201 side and the outer peripheral side, and the second lip portion 13 is formed from the outer peripheral side base portion 11 to the cover 202 side and the outer peripheral side. It has a protruding shape. As a result, when the gasket 100 is sandwiched between the case body 201 and the cover 202, the first lip portion 12 and the second lip portion 13 are likely to be elastically deformed to the outer peripheral side which is the same side. When the first lip portion 12 and the second lip portion 13 are elastically deformed toward the outer peripheral side over the entire circumferential direction, stable sealing performance can be ensured in the outer peripheral side sealing portion 10.

The technical scope of the present invention is not limited to the above-described embodiment, and modifications can be made as appropriate without departing from the spirit of the present invention. In the above-described embodiment, the configuration in which the gasket 100 is placed in the groove 201a has been described as an example, but the present invention is not limited to this. For example, the gasket 100 may be fixed to one of the case body 201 and the cover 202 by a fixing member such as a bolt. In this case, the gasket 100 is provided with a through hole for penetrating the fixing member. This through hole can be provided in, for example, the connecting portion 30. The through hole may be provided so as to hang on a part of the outer peripheral side seal portion 10 and the inner peripheral side seal portion 20. Further, a metal ring through which the fixing member is passed may be attached to the through hole. The through hole can be formed by forming a linear rubber member and then processing the rubber member, for example, when manufacturing the gasket 100. The through hole may be formed by processing after joining the ends of the rubber members.

10 Outer peripheral side sealing portion 11 Outer peripheral side base portion 11a Recessed portion 12 First lip portion 12a, 13a Outer peripheral surface 12b, 13b Inner peripheral surface 12c, 13c Tip portion 13 Second lip portion 20 Inner peripheral side sealing portion 21 Inner peripheral side base 21K Hollow Part 22 Stress absorbing part 30 Connecting part 31 Outer peripheral side connecting part 32 Inner circumference side connecting part 100 Gasket 101 Straight part 102 Curved part 200 Case 201 Case body 201a Positioning part, groove 202 Cover AX Center position Sa 1st surface Sb 2nd surface

Claims (4)

An annular gasket that is arranged between the first member and the second member mounted on the first member and seals the gap between the first member and the second member.
An outer peripheral side base portion that is annular and has a concave portion on the outer peripheral side, an annular first lip portion that protrudes from the outer peripheral side base portion to the first member side and the outer peripheral side, and the outer peripheral side base portion. An outer peripheral side sealing portion having an annular second lip portion protruding toward the second member side and the outer peripheral side, and an outer peripheral side sealing portion.
An inner peripheral side base portion that is annular and is arranged on the inner peripheral side of the outer peripheral side seal portion, and a stress absorbing portion that is arranged inside the inner peripheral side base portion and absorbs a part of the stress applied to the inner peripheral side base portion. And, with the inner peripheral side seal part,
A gasket that is arranged between the outer peripheral side seal portion and the inner peripheral side seal portion and includes a connecting portion that connects the outer peripheral side base portion and the inner peripheral side base portion. The gasket according to claim 1, wherein the stress absorbing portion is a hollow portion provided all around the inside of the inner peripheral side base portion. The gasket according to claim 2, wherein the inner peripheral side base is cylindrical. The first lip portion is connected to the first outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base portion and the first outer peripheral surface side connected to the inner peripheral portion of the outer peripheral side base portion and directed toward the tip end side in the protruding direction. It has a first inner peripheral surface with an inclined shape, and has an inclined shape.
The second lip portion is connected to the second outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base portion and the second outer peripheral surface side connected to the inner peripheral portion of the outer peripheral side base portion and directed toward the tip end side in the protruding direction. The gasket according to any one of claims 1 to 3, which has a second inner peripheral surface having an inclined shape.

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