JP2019078325A - gasket - Google Patents

Abstract

To provide a gasket which can secure a uniform seal.SOLUTION: A gasket 100 includes: an outer periphery side seal part 10 having an outer periphery side base part 11 which has an annular shape and in which a first recessed part 11a is provided over an entire periphery of an outer periphery part, a first annular lip part 12 protruding from the outer periphery side base part 11 to the case body 201 side and the outer periphery side, and a second annular lip part 13 protruding from the outer periphery side base part 11 to the cover side and the outer periphery side; an inner periphery side seal part 20 having an inner periphery side base part 21 which has an annular shape and is disposed at the inner periphery side of the outer periphery side seal part 10 and in which a second recessed part 21a is provided over an entire periphery of an outer periphery part, a third annular lip part 22 protruding from the inner periphery side base part 21 to the case body 201 side and the outer periphery side, and a fourth annular lip part 23 protruding from the inner periphery side base part 21 to the cover side and the outer periphery side; and a connection part 30 which is disposed between the outer periphery side seal part 10 and the inner periphery side seal part 20 and connects the outer periphery side base part 11 to the inner periphery side base part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gasket.

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

JP 2012-122536 A

  The gasket described in Patent Document 1, for example, is first formed in a straight line by a rubber material or the like, the end portions are joined and formed in an annular shape, and a part is formed to conform to the outer shape of the case main body and the cover. A curved portion is provided. The curved portion of such a gasket is in a state of being stressed and deformed so that the outer peripheral side is pulled in the outer peripheral direction and the inner peripheral side is contracted in the inner peripheral direction. Therefore, when the gasket is sandwiched between the case main body and the cover, the curved portion may be less likely to be elastically deformed as compared to the straight portion. In this case, there may be differences in the degree of sealing between the straight and curved portions of the gasket.

  This invention is made in view of the above, and an object of the present invention is to provide the gasket which can secure a uniform seal.

  The gasket according to the present invention is an annular gasket disposed between a first member and a second member attached to the first member and sealing a gap between the first member and the second member. An outer peripheral side base having an annular outer peripheral portion provided with a first recess over the entire circumference, an annular first lip portion projecting from the outer peripheral side base to the first member side and the outer peripheral side, and the outer peripheral side An outer peripheral seal portion having an annular second lip portion projecting from the base to the second member side and the outer peripheral side, and an annular seal portion disposed on the inner peripheral side of the outer peripheral seal portion and extending around the entire outer peripheral portion An inner peripheral side base provided with a second recess, an annular third lip portion projecting from the inner peripheral side base to the first member side and an outer peripheral side, and the inner peripheral side base to the second member side And an annular fourth lip portion projecting to the outer peripheral side, and an inner peripheral side seal portion It is arranged between the inner peripheral side sealing portion and the outer peripheral side sealing portion, and a connecting portion connecting the inner peripheral side base and the outer peripheral side base.

  In the above gasket, the first lip portion is connected to a first outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base and an inner peripheral portion of the outer peripheral side base toward the tip end side in the projecting direction. (1) A first inner peripheral surface having a shape inclined to 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, and an inner peripheral of the outer peripheral side base And a second inner peripheral surface having a shape inclined toward the second outer peripheral surface toward the tip end side in the projecting direction, and the third lip portion is connected to the outer peripheral portion of the inner peripheral side base And a third inner peripheral surface having a shape connected to the inner peripheral portion of the inner peripheral side base and inclined toward the third outer peripheral surface toward the distal end side in the projecting direction, The fourth lip portion is connected to the fourth outer peripheral surface connected to the outer peripheral portion of the inner peripheral side base, and to the inner peripheral portion of the inner peripheral side base, on the tip end side in the projecting direction Only and it may have a fourth inner peripheral surface of a shape inclined to the fourth outer circumferential face side.

  In the above gasket, the first recess and the second recess may have a cylindrical surface shape, and the diameter of the second recess may be larger than the diameter of the first recess.

  In the above-mentioned gasket, the inner peripheral side base may have a hollow portion over the entire circumference.

  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 the gasket according to the present embodiment. FIG. 2 is a view showing a shape taken along the line A-A in FIG. FIG. 3 is a view showing a shape taken along the line B-B in FIG. FIG. 4 is a cross-sectional view showing a state where the curved portion of the gasket is sandwiched between the case body and the cover. FIG. 5 is a cross-sectional view showing another example of the gasket according to the present embodiment.

  Hereinafter, an embodiment of a gasket concerning the present invention is described based on a drawing. The present invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by persons 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 disposed between the case body 201 and the cover 202 in the case 200 having the case 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 a gap between the first surface Sa of the case main body 201 and the second surface Sb of the cover 202 while being sandwiched between the case main body 201 and the cover 202. In FIG. 1, the gasket 100 is placed on the case main body 201, and the cover 202 is removed from the case main body 201.

  In the present embodiment, the case 200 is a large case having a circumferential 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 external shape of the case 200 (the case main body 201 and the cover 202) has an octagonal shape as an example, but it is not limited thereto, and may have a polygonal shape such as a square or a hexagon. And may be circular or elliptical. Although FIG. 1 shows the case main body 201 and the cover 202 as a box-like configuration having a thickness, the present invention is not limited thereto, and at least one of the case main body 201 and the cover 202 may be plate-like.

  At least one of the case body 201 and the cover 202 of the case 200 is provided with a positioning portion such as a groove portion or a projection portion for positioning the gasket 100. In the present embodiment, a configuration in which a groove-shaped positioning portion 201a is provided in the case main body 201 will be described as an example. The positioning portion 201 a is formed along the outer periphery of the case main body 201. The dimension of the positioning portion 201 a in the width direction (a direction parallel to the bottom surface of the positioning portion 201 a and orthogonal to the direction in which the positioning portion 201 a extends) is set to a size that can accommodate the gasket 100. The gasket 100 is accommodated in the positioning portion 201a and disposed in a state of 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 annularly along the outer periphery of the case 200. Examples of the rubber material constituting the gasket 100 include nitrile rubber, acrylic rubber, EPDM, CR, silicone rubber, fluororubber, natural rubber and the like.

  Hereinafter, in describing the configuration of the gasket 100, the side on which the case main body 201 is disposed with respect to the gasket 100 will be referred to as the case main body 201 side, taking the case of being provided in the case 200 of this embodiment as an example. The side on which is placed is referred to as the cover 202 side. Also, 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 main body 201 and the cover 202 are not limited to the configuration disposed vertically, and may be disposed horizontally or in other directions.

  The gasket 100 has a shape corresponding to the outer shape of the case main body 201 and the cover 202. In the present embodiment, the gasket 100 is octagonal and has eight straight portions 101 and eight curved portions 102. The straight portion 101 is a portion corresponding to the side portion of the case main body 201 and the cover 202. The curved portion 102 is a portion corresponding to the corner of the case body 201 and the cover 202. The curved portion 102 is formed in an arc shape, for example, according to the angle of the corner of the case body 201 and the cover 202. In addition, the curved part 102 is not limited to circular arc shape, Another shape may be sufficient. Moreover, the gasket 100 is not limited to the shape corresponding to the external shape of the case main body 201 and the cover 202, For example, the whole may be a curved structure. Also, the gasket 100 may be deformable according to the outer shape of the case body 201 and the cover 202.

  FIG. 2 is a view showing a shape taken along the line A-A in FIG. FIG. 2 shows the longitudinal cross-sectional shape of the straight portion 101 of the gasket 100. In the present embodiment, the longitudinal 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 seal portion 10, an inner peripheral seal 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 disposed in this order from the outer peripheral side to the inner peripheral side. Be done. For this reason, 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 11 is annular, and has a first recess 11 a in the outer peripheral portion. The first concave portion 11 a is provided on the outer circumferential portion of the outer circumferential side seal portion 10 along the entire circumference. The first recess 11 a is, for example, an arc in the longitudinal cross-sectional shape.

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

  The second lip portion 13 is annular, and protrudes from the outer peripheral side base 11 to the cover 202 side and the outer peripheral side. The second lip portion 13 has a configuration similar to that of 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 13 a is connected to the outer peripheral portion of the outer peripheral side base 11. The inner circumferential surface 13 b is connected to the inner circumferential portion of the outer circumferential side base portion 11 and is inclined toward the outer circumferential surface 13 a toward the tip end side of the second lip portion 13 in the projecting direction. The tip portion 13 c is disposed at the tip of the second lip portion 13 in the protruding direction, and connects the outer circumferential surface 13 a and the inner circumferential surface 13 b. The distal end portion 13c has a curved shape, but is not limited to this, and may have a shape having a corner. As shown in FIG. 2, in a state where the gasket 100 is placed on the groove portion 201a of the case main body 201, the second lip portion 13 is 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 projecting direction, so that the case body 201 side from the outer peripheral side base 11 and the outer peripheral side It has a protruding shape. It has a shape projecting from the outer peripheral side base 11 to the cover 202 side and the outer peripheral side. The second lip portion 13 may be different in shape, size, and the like from the first lip portion 12.

  The inner peripheral side seal portion 20 has an inner peripheral side base portion 21, a third lip portion 22, and a fourth lip portion 23. The inner peripheral side base 21 is annular, and has a second recess 21 a on the outer peripheral portion. The second recess 21 a is provided on the outer peripheral portion of the inner peripheral seal portion 20 along the entire circumference. The second recess 21 a has, for example, an arc shape in a longitudinal sectional shape. The diameter R2 of the second recess 21a is larger than the diameter R1 of the first recess 11a of the outer peripheral seal portion 10.

  The third lip portion 22 is annular, and protrudes from the inner peripheral side base 21 to the case main body 201 side and the outer peripheral side. The third lip portion 22 has an outer peripheral surface (third outer peripheral surface) 22a, an inner peripheral surface (third inner peripheral surface) 22b, and a tip portion 22c. The outer circumferential surface 22 a is connected to the outer circumferential portion of the inner circumferential side base 21. The inner circumferential surface 22 b is connected to the inner circumferential portion of the inner circumferential side base 21, and is inclined toward the outer circumferential surface 22 a toward the tip end side of the third lip portion 22 in the projecting direction. The distal end portion 22c is disposed at the distal end of the third lip portion 22 in the projecting direction, and connects the outer peripheral surface 22a and the inner peripheral surface 22b. The distal end portion 22c has a curved shape, but is not limited to this, and may have a shape having a corner. As shown in FIG. 2, in a state where the gasket 100 is placed on the positioning portion 201a of the case main body 201, the third lip portion 22 is tapered toward the tip portion 22c by the outer peripheral surface 22a and the inner peripheral surface 22b. It has the shape of Further, the third lip portion 22 has a shape in which the inner peripheral surface 22b is inclined toward the outer peripheral surface 22a toward the tip end side in the projecting direction, so that the case body 201 side and the outer periphery from the inner peripheral side base 21 It has a shape that protrudes to the side.

  The fourth lip portion 23 is annular, and protrudes from the inner peripheral side base 21 to the cover 202 side and the outer peripheral side. The fourth lip portion 23 has a configuration similar to that of the third lip portion 22 described above. That is, the fourth lip portion 23 has an outer peripheral surface (fourth outer peripheral surface) 23a, an inner peripheral surface (fourth inner peripheral surface) 23b, and a tip end portion 23c. The outer circumferential surface 23 a is connected to the outer circumferential portion of the inner circumferential side base 21. The inner circumferential surface 23 b is connected to the inner circumferential portion of the inner circumferential side base 21, and is inclined toward the outer circumferential surface 23 a toward the tip end side of the fourth lip portion 23 in the projecting direction. The end portion 23c is disposed at the end of the fourth lip portion 23 in the projecting direction, and connects the outer peripheral surface 23a and the inner peripheral surface 23b. The distal end portion 23 c has a curved shape, but is not limited to this, and may have a shape having a corner. As shown in FIG. 2, in a state where the gasket 100 is placed on the positioning portion 201a of the case main body 201, the fourth lip portion 23 is tapered toward the tip by the outer peripheral surface 23a and the inner peripheral surface 23b. Have. Further, the fourth lip portion 23 has a shape in which the inner peripheral surface 23b is inclined toward the outer peripheral surface 23a toward the tip end side in the projecting direction, whereby the cover 202 side and the outer peripheral side from the inner peripheral side base 21 It has a protruding shape. The fourth lip 23 may be different in shape, size, and the like from the third lip 22.

  The connection portion 30 is disposed between the outer circumferential seal portion 10 and the inner circumferential seal portion 20. The connecting portion 30 connects the outer peripheral side base 11 and the inner peripheral side base 21. The connection part 30 is, for example, plate-like, but is not limited thereto. The connecting portion 30 is disposed 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 central position AX. Therefore, either of the gaskets 100 in the vertical direction may be opposed to the case main body 201, and either may be opposed to the cover 202 side. The position of the connecting portion 30 is not limited to the center position AX, and may be arranged to be biased upward or downward 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 11. The inner peripheral side connecting portion 32 is connected to the inner peripheral side base 21. The outer peripheral side connection part 31 has a curved surface which spreads toward the outer peripheral side base 11 side. This curved surface can be, for example, an arc shape in the longitudinal sectional shape. The inner peripheral side connection part 32 has a curved surface which spreads toward the inner peripheral side base 21 side. This curved surface can be, for example, an arc shape in the longitudinal sectional shape.

  The above 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 seal portion 10, the inner peripheral seal portion 20, and the connecting portion 30 by an extrusion molding method or the like using a rubber material prior to vulcanization treatment. Form Thereafter, the rubber member is vulcanized. At the time of this vulcanization treatment, the annular gasket 100 is formed by melting and joining the end portions of the rubber members by heat. Thereafter, 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 view showing a shape taken along the line B-B in FIG. FIG. 3 shows the cross-sectional configuration 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 state of being stressed and deformed so that the outer peripheral side is pulled in the outer peripheral direction and the inner peripheral side is contracted in the inner peripheral direction. In addition, in FIG. 3, in order to show the structure of the curved part 102 intelligibly, the deformation amount is shown larger than the actual.

  A stress that is pulled in the outer peripheral direction is applied to the outer peripheral seal portion 10 disposed on the outer peripheral side. The stress causes the outer peripheral portion of the outer peripheral side base portion 11 to deform so as to extend vertically. In the present embodiment, a first recess 11 a is provided on the outer peripheral portion of the outer peripheral side base 11. Therefore, the outer peripheral side base portion 11 is deformed so that the first concave portion 11a is opened in the vertical direction. Due to the deformation of the outer peripheral side base 11, the first lip portion 12 protrudes downward and the second lip portion 13 protrudes upward without an excessive force applied to the outer peripheral portion of the outer peripheral side base 11. Do.

  Due to the deformation of the outer peripheral side base 11, although the first lip portion 12 and the second lip portion 13 are directed to the inner peripheral side compared to the straight portion 101 as shown by the two-dot chain line in FIG. Each of 12c and 13c protrudes outward. Therefore, in each of the straight portion 101 and the curved portion 102, the first lip portion 12 and the second lip portion 13 are in a state in which the tip portions 12c and 13c protrude outward.

  On the other hand, a stress that contracts in the inner circumferential direction is applied to the inner circumferential seal portion 20 disposed on the inner circumferential side. Due to this stress, the outer peripheral portion of the inner peripheral side base 21 is also deformed so as to extend vertically. In the present embodiment, a second recess 21 a is provided on the outer peripheral portion of the inner peripheral side base 21. Therefore, the inner circumferential side base portion 21 is deformed so that the second concave portion 21a is opened in the vertical direction. Due to the deformation of the inner peripheral side base 21, the third lip portion 22 projects downward, and the fourth lip portion 23 moves upward, without exerting an excessive force on the outer peripheral portion of the inner peripheral side base 21. Stand out. The diameter R2 of the second recess 21a provided in the inner peripheral side base 21 is larger than the diameter R1 of the first recess 11a of the outer peripheral seal portion 10. Therefore, in the inner peripheral side base 21, deformation occurs with a smaller stress than the outer peripheral side base 11.

  Due to the deformation of the inner peripheral side base portion 21, the third lip portion 22 and the fourth lip portion 23 are directed to the inner peripheral side compared with the straight portion 101 as shown by the two-dot chain line in FIG. The portions 22 c and 23 c are in a state of protruding toward the outer peripheral side. Therefore, in each of the straight portion 101 and the curved portion 102, the third lip portion 22 and the fourth lip portion 23 are in a state in which the tip portions 22c and 23c protrude toward the outer peripheral side.

  In a state where the gasket 100 is mounted on the case main body 201, by mounting the cover 202, the gasket 100 is sandwiched between the case main 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 protrude outward. That is, in the first lip portion 12 and the second lip portion 13, the tip portions 12c and 13c protrude toward the same outer peripheral side which is the same side over the entire circumferential direction. Further, the first lip portion 12 is in contact with the case main body 201 at a position where the tip end portion 12c is on the inner peripheral surface 12b side.

  When the cover 202 is attached from this state, the cover 202 abuts on a position on the inner peripheral surface 13 b side of the tip 13 c of the second lip 13 and presses the second lip 13 downward. FIG. 4 is a cross-sectional view showing a state where the curved portion 102 of the gasket 100 is sandwiched between the case main body 201 and the cover 202. As shown in FIG. As shown in FIG. 4, in the gasket 100, the position on the inner peripheral surface 12 b side of the tip portion 12 c of the first lip portion 12 is pressed by the case main body 201, and the inner periphery of the tip portion 13 c of the second lip portion 13. It is pinched in a state where the position on the surface 13 b side is pressed by the cover 202. Thereby, the 1st lip part 12 and the 2nd lip part 13 elastically deform to the perimeter side which is the same side. With the first lip portion 12 and the second lip portion 13 being elastically deformed to the outer peripheral side over the entire circumferential direction, stable sealability is secured in the outer peripheral side seal portion 10.

  Similarly, in the inner peripheral seal portion 20, the position of the inner peripheral surface 22b of the tip portion 22c of the third lip portion 22 of the gasket 100 is pressed by the case main body 201, and the distal end of the fourth lip portion 23 is Of the portion 23c, the position on the inner peripheral surface 23b side is pinched by the cover 202 in a pressed state. As a result, the third lip 22 and the fourth lip 23 are elastically deformed to the same outer peripheral side. By the third lip portion 22 and the fourth lip portion 23 being in a state of being elastically deformed to the outer peripheral side over the entire circumferential direction, a sufficient deformation is secured in the inner peripheral side seal portion 20, and a stable sealing property Is secured.

  As described above, the gasket 100 according to the present embodiment is disposed between the case main body 201 and the cover 202 attached to the case main body 201, and is an annular gasket 100 sealing the gap between the case main body 201 and the cover 202. And an outer peripheral side base 11 having an annular outer peripheral portion provided with a first recess 11a all around the outer peripheral portion, and an annular first lip 12 projecting from the outer peripheral side base 11 to the case main body 201 side and the outer peripheral side. And an outer peripheral 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 annular outer peripheral seal portion 10 disposed on the inner peripheral side of the outer peripheral seal portion 10 An inner peripheral side base 21 provided with a second recess 21a over the entire circumference and an annular third lip 22 projecting from the inner peripheral side base 21 to the case body 201 side and the outer peripheral side; An inner circumferential seal portion 20 having an annular fourth lip 23 projecting from the circumferential base portion 21 toward the cover 202 side and the outer circumferential side, and disposed between the outer circumferential seal portion 10 and the inner circumferential seal portion 20 And the connection part 30 which connects the outer peripheral side base 11 and the inner peripheral side base 21 is provided.

  With this configuration, the outer peripheral seal portion 10 and the inner peripheral seal portion 20 are arranged side by side in a state of being connected by the connecting portion 30, so that the gasket 100 can be prevented from falling to the outer peripheral side or the inner peripheral side. For this reason, the gasket 100 is stably disposed. Further, the gasket 100 is provided with the first lip portion 12, the second lip portion 13, the third lip portion 22 and the fourth lip portion 23, whereby the outer peripheral seal portion 10 and the inner peripheral seal portion in the curved portion 102 are provided. It can suppress that 20 becomes difficult to elastically deform. For this reason, when the gasket 100 is sandwiched between the case main body 201 and the cover 202, the outer peripheral seal portion 10 and the inner peripheral seal portion 20 are as elastic as any of the straight portion 101 and the curved portion 102. It will be deformed. Thereby, a uniform seal can be secured over the entire circumferential direction of the gasket 100.

  Further, in the gasket 100 according to the present embodiment, the first lip portion 12 is connected to the outer peripheral surface 12 a connected to the outer peripheral portion of the outer peripheral side base 11 and to the inner peripheral portion of the outer peripheral side base 11 The second lip portion 13 has an outer peripheral surface 13 a connected to the outer peripheral portion of the outer peripheral side base 11 and an inner surface of the outer peripheral side base 11. The third lip portion 22 is connected to the outer peripheral portion of the inner peripheral side base portion 21 and has an inner peripheral surface 13 b connected to the peripheral portion and inclined toward the outer peripheral surface 13 a toward the tip end side in the projecting direction The fourth lip portion 23 has an outer peripheral surface 22 a and an inner peripheral surface 22 b connected to the inner peripheral portion of the inner peripheral side base 21 and inclined toward the outer peripheral surface 22 a toward the tip end side in the projecting direction. An outer circumferential surface 23 a connected to the outer circumferential portion of the inner circumferential side base 21 and an inner circumferential of the inner circumferential side base 21 Toward the distal end side of the connected projecting direction with an inner peripheral surface 23b of the inclined shape to the outer peripheral surface 23a side. For this reason, the first lip portion 12, the second lip portion 13, the third lip portion 22 and the fourth lip portion 23 are tapered toward the tip. Further, the first lip portion 12 protrudes from the outer peripheral side base 11 toward the case main body 201 side and the outer peripheral side, and the second lip portion 13 protrudes from the outer peripheral side base 11 toward the cover 202 side and the outer peripheral side Become. As a result, when the gasket 100 is sandwiched between the case body 201 and the cover 202, the first lip 12 and the second lip 13 are easily elastically deformed to the same outer peripheral side. Similarly, the third lip portion 22 protrudes from the inner peripheral side base 21 toward the case main body 201 side and the outer peripheral side, and the fourth lip portion 23 protrudes from the inner peripheral side base 21 toward the cover 202 and the outer peripheral side Because of the above-described shape, when the gasket 100 is sandwiched between the case body 201 and the cover 202, the third lip 22 and the fourth lip 23 are easily elastically deformed to the same outer peripheral side. In this manner, the first lip portion 12, the second lip portion 13, the third lip portion 22 and the fourth lip portion 23 are elastically deformed to the outer peripheral side over the whole of the circumferential direction, thereby the outer peripheral side seal A stable sealing performance can be secured in the portion 10.

  Moreover, in the gasket 100 according to the present embodiment, the first recess 11a and the second recess 21a have a cylindrical surface shape, and the diameter R2 of the second recess 21a is larger than the diameter R1 of the first recess 11a. Therefore, in the inner peripheral side base 21, deformation occurs with a smaller stress than the outer peripheral side base 11. Thereby, in the gasket 100, a sufficient deformation is secured in the inner peripheral seal portion 20, and a stable sealing performance is ensured.

  The technical scope of the present invention is not limited to the above embodiment, and appropriate modifications can be made without departing from the scope of the present invention. For example, although the above-mentioned embodiment mentioned and explained to the example the composition by which inner circumference side base 21 was provided in solid form, it is not limited to this. FIG. 5 is a cross-sectional view showing another example of the gasket according to the present embodiment. In the gasket 100A shown in FIG. 5, the inner circumferential side base 21A has a hollow portion 24 over the entire circumference. With this configuration, in the inner peripheral seal portion 20A, the stress on the inner peripheral portion of the inner peripheral base portion 21A is absorbed by the hollow portion 24. For this reason, it is suppressed that the said stress is transmitted to the outer peripheral side seal part 10 side from the connection part 30, and a deformation | transformation of the outer peripheral side seal part 10 by the said stress is suppressed.

  Further, in the above-described embodiment, the configuration in which the gasket 100 is placed in the state accommodated in the positioning portion 201a is 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 allowing the fixing member to pass therethrough. This through hole can be provided, for example, in the connecting portion 30. The through hole may be provided so as to hang on a part of the outer peripheral seal portion 10 and the inner peripheral seal portion 20. Moreover, the metal ring which allows a fixing member to pass may be attached to a through-hole. For example, when manufacturing the gasket 100, the through hole can be formed by processing a linear rubber member and then processing the rubber member. The through holes may be formed by bonding after the ends of the rubber members are joined.

DESCRIPTION OF SYMBOLS 10 Outer peripheral side seal part 11 Outer peripheral side base part 11a 1st recessed part 12 1st lip part 12a, 13a, 22a, 23a Outer peripheral surface 12b, 13b, 22b, 23b Inner peripheral surface 12c, 13c, 22c, 23c Tip part 13 2nd lip Portions 20, 20A Inner peripheral side seal portion 21, 21A Inner peripheral side base portion 21a Second recessed portion 22 Third lip portion 23 Fourth lip portion 24 Hollow portion 30 Connecting portion 31 Outer peripheral side connecting portion 32 Inner peripheral side connecting portion 100, 100A Gasket 101 Straight portion 102 Curved portion 200 Case 201 Case body 201a Positioning portion 202 Cover AX Center position Sa First surface Sb Second surface

Claims (4)

An annular gasket disposed between a first member and a second member attached to the first member and sealing a gap between the first member and the second member,
An outer peripheral side base having an annular outer peripheral portion provided with a first recess over the entire circumference, an annular first lip portion projecting from the outer peripheral side base to the first member side and the outer peripheral side, and the outer peripheral side base An outer peripheral seal portion having an annular second lip portion projecting from the second member side and the outer peripheral side;
An inner peripheral base which is annular and disposed on the inner peripheral side of the outer peripheral seal portion and provided with a second recess over the entire outer peripheral portion; and from the inner peripheral base to the first member side and the outer peripheral side An inner peripheral seal portion having a protruding annular third lip portion, and an annular fourth lip portion protruding from the inner peripheral side base to the second member side and the outer peripheral side;
A gasket comprising: a connecting portion disposed between the outer peripheral side seal portion and the inner peripheral side seal portion and connecting the outer peripheral side base and the inner peripheral side base. The first lip portion is connected to a first outer peripheral surface connected to the outer peripheral portion of the outer peripheral side base, and to an inner peripheral portion of the outer peripheral side base, and is directed to the first outer peripheral surface side toward the tip end side in the projecting direction And a first inner circumferential surface having 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, and to the inner peripheral portion of the outer peripheral side base, and is directed to the second outer peripheral surface side toward the tip end side in the projecting direction And a second inner circumferential surface having an inclined shape,
The third lip portion is connected to the third outer peripheral surface connected to the outer peripheral portion of the inner peripheral side base, and the inner peripheral portion of the inner peripheral side base, and is directed to the distal end side in the projecting direction And a third inner circumferential surface having a shape inclined to the side,
The fourth lip portion is connected to a fourth outer peripheral surface connected to the outer peripheral portion of the inner peripheral side base, and to an inner peripheral portion of the inner peripheral side base, and is directed to the distal end side in the projecting direction The gasket according to claim 1, further comprising: a fourth inner circumferential surface having a shape inclined to the side. The first recess and the second recess have a cylindrical surface shape,
The gasket according to claim 1, wherein a diameter of the second recess is larger than a diameter of the first recess. The gasket according to any one of claims 1 to 3, wherein the inner peripheral side base has a hollow portion over the entire circumference.

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