Split gasket, mounting structure for split gasket and assembly method for split gasket

Abstract

To provide a split gasket in which split parts are assembled easily.SOLUTION: A split gasket 100 is formed by combining a plurality of split parts 30 including a first split part 10 and a second split part 20, where the first split part 10 has a body part 11 and a protrusion part 12, the second split part 20 has a recess part 21, the protrusion part 12 has a protrusion part side narrowed part 13 and a tip part 14, the recess part 21 has a recess part side narrowed part 22 into which the protrusion part side narrowed part 13 is fitted, and a back part 23 that is arranged on a back side with respect to the recess part side narrowed part 22 and into which the tip part 14 is fitted, the tip part 14 is wider than the recess part side narrowed part 22, and the first split part 10 and the second split part 20 can move relative to each other in a protrusion direction of the protrusion part 12 in a state where the protrusion part 12 is fitted into the recess part 21.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a split gasket, a mounting structure for the split gasket, and a method for assembling the split gasket. [Background technology]

[0002] 2. Description of the Related Art Sheet-like gaskets that are inserted between components to seal against fluid leakage are known. Such gaskets are generally obtained by punching out a sheet metal plate using a press. However, when forming the entire annular gasket by punching out a metal plate, a lot of waste material is generated, such as the metal plate located on the inner circumference of the gasket becoming waste material (punching scraps), resulting in a lot of material waste.

[0003] In view of these circumstances, Patent Document 1 proposes a technique for reducing the amount of waste material generated by giving the gasket a divided structure constituted by combining a plurality of divided parts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2011 / 083595 Brochure Summary of the Invention [Problem to be solved by the invention]

[0005] However, according to the investigations of the present inventors, there is still room for improvement in the technique of Patent Document 1 with regard to the ease of assembling the divided portions together.

[0006] The present invention has been made in consideration of the above problems, and provides a split gasket that allows easy assembly of the split parts, a mounting structure for the split gasket, and a method for assembling the split gasket. [Means for solving the problem]

[0007] According to the present invention, there is provided a sheet-like divided gasket formed by combining a plurality of divided sections, including a first divided section and a second divided section, in the same layer arrangement, comprising: The first divided portion has a main body portion and a protruding portion protruding from the main body portion, the second divided portion has a recess into which the protrusion is fitted, The protrusion has a protrusion side narrowed portion and a tip portion formed on a tip side of the protrusion side narrowed portion, the recess has a recess-side constricted portion into which the protrusion-side constricted portion fits, and a rear portion that is disposed on a rear side of the recess relative to the recess-side constricted portion and into which the tip portion fits, The tip portion is wider than the recessed portion, The split gasket is provided such that, with the protruding portion fitted in the recessed portion, the first split portion and the second split portion are relatively movable in the protruding direction of the protruding portion.

[0008] According to the present invention, there is also provided a split gasket mounting structure in which the split gasket of the present invention is interposed between a first member and a second member, and the first member and the second member are fixed to each other, comprising: The protrusion of the first divided portion is fitted into the recess of the second divided portion, The present invention provides a mounting structure for a split gasket, in which a liquid gasket is filled in the gap between the tip portion and the inner peripheral edge of the back portion, and in the gap between the protrusion side narrowed portion and the recess side narrowed portion.

[0009] Also, according to the present invention, there is provided a split gasket mounting structure in which the tip portion is formed to be wider toward the base end side, and both corners at the base end side of the tip portion are capable of point contact with an end portion of the innermost part of the second split portion on the side of the recess-side narrow portion, and each of the first split portion and the second split portion has a metal base material and a covering portion formed of an elastic material covering the base material, the split gasket is interposed between a first member and a second member, and the first member and the second member are fixed to each other, There is provided a split gasket mounting structure in which both corners on the base end side of the tip portion are respectively inserted into the covering portion at the end portion on the recess-side narrow portion side in the innermost portion of the second split portion.

[0010] According to the present invention, there is also provided a method for assembling a split gasket of the present invention, in which the tip portion is formed to be wider toward the base end side, and both corners of the tip portion on the base end side can be in point contact with an end portion of the innermost portion of the second split portion on the side of the recess-side narrowed portion, comprising the steps of: a step of fitting the tip portion into the inner portion while widening an opening of the recess by moving the first divided portion relative to the second divided portion in a protruding direction of the protruding portion, the tip portion being pushed and widened by the tip portion; a step of fitting the tip portion into the inner portion, and then moving the first divided portion relative to the second divided portion in a direction opposite to the protruding direction of the protruding portion, thereby bringing both corners on the base end side of the tip portion into point contact with an end portion of the inner portion of the second divided portion on the side of the recess-side narrow portion; A method for assembling a split gasket comprising the steps of: Effect of the Invention

[0011] According to the present invention, the divided portions can be more easily assembled together. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view showing the split gasket according to the first embodiment in a state prior to assembly. [Diagram 2] 2(a) is an enlarged view of part A in FIG. 1, and FIG. 2(b) is an enlarged view of part B in FIG. [Diagram 3] FIG. 2 is a plan view showing the split gasket according to the first embodiment after assembly. [Figure 4] FIG. 4 is an enlarged view of part A in FIG. [Diagram 5] 4 is a plan view showing a state in which a liquid gasket has been applied to gaps after the split gaskets according to the first embodiment have been assembled. FIG. [Figure 6] FIG. 6 is an enlarged view of part A in FIG. 5. [Figure 7] 3 is a plan view of the split gasket according to the first embodiment, showing the state after the inner periphery elastic body has been formed. FIG. [Figure 8] Figure 8(a) is a diagram showing an example of the cross-sectional structure of the split portion of the split gasket according to the first embodiment, and Figure 8(b) is a diagram showing another example of the cross-sectional structure of the split portion of the split gasket according to the first embodiment, each showing a cross-section along line AA in Figure 7. [Figure 9] 8 is a schematic cross-sectional view showing the mounting structure of the split gasket according to the first embodiment, showing the structure at a position corresponding to line BB in FIG. 7. [Figure 10] 11 is a schematic plan view showing a state before the split gasket according to the second embodiment is assembled. FIG. [Figure 11] FIG. 11 is an enlarged view of part A in FIG. [Figure 12] 12(a) to 12(d) are plan views illustrating a series of steps in the method of assembling the split gasket according to the second embodiment. [Figure 13] FIG. 11 is an enlarged plan view showing a state in which a corner of a tip end of a protrusion of a first divided section is biting into a covering section at an end section on a constricted section side of a recess in a deep part of a second divided section in a second embodiment. [Figure 14]12 is a schematic cross-sectional view showing the mounting structure of the split gasket according to the first embodiment, showing the structure at a position corresponding to the line AA in FIG. [Figure 15] FIG. 11 is an enlarged plan view showing the split gasket according to the third embodiment in an assembled state. [Figure 16] 16 is a schematic cross-sectional view showing the state in which the split gasket according to the third embodiment is disposed between components after assembly, showing the structure at a position corresponding to line AA in FIG. 15. [Figure 17] FIG. 13 is a plan view illustrating a mounting structure for a split gasket according to a third embodiment, showing an excerpt of the split gasket. [Figure 18] 18 is a schematic cross-sectional view showing the mounting structure of the split gasket according to the third embodiment, taken along line AA in FIG. 17. [Figure 19] Figures 19(a) and 19(b) are schematic cross-sectional views for explaining the shape of a bead in a modified example of the third embodiment, where Figure 19(a) shows the shape of the bead before it is compressed, and Figure 19(b) shows the shape of the bead after it is compressed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0014] [First embodiment] First, the first embodiment will be described with reference to FIGS. Fig. 1 shows the shapes of the first split portion 10 and the second split portion 20 of the split gasket 100 viewed in their normal direction, and is referred to as a plan view for convenience. Similarly, Fig. 2 to Fig. 7 are also shown as plan views for convenience. However, when the split gasket 100 is used or manufactured, the relationship between the direction of gravity (vertical direction) and the normal direction of the split gasket 100 is arbitrary and may or may not coincide with each other. In addition, in FIG. 6, the region where the liquid gasket 40 exists is cross-hatched for the sake of convenience in order to make the region easier to understand. In this specification, unless otherwise specified, the positional relationship between the various parts of the split gasket 100 and the shape of each part are described in the in-plane direction of the split gasket 100. Furthermore, unless otherwise specified, the description is of the multiple split parts 30 (particularly the first split part 10 and the second split part 20) arranged in the same layer and combined with each other.

[0015] The split gasket 100 according to this embodiment is a sheet-like split gasket 100 formed by combining a plurality of split portions 30, including a first split portion 10 and a second split portion 20, in an arrangement in the same layer, and the first split portion 10 has a main body portion 11 and a protruding portion 12 protruding from the main body portion 11, the second split portion 20 has a recess 21 into which the protruding portion 12 is fitted, and the protruding portion 12 has a protruding portion side narrowed portion 13 and a recess 21 at the end of the protruding portion side narrowed portion 13. and a tip portion 14 formed on the end side, and the recess 21 has a recess side constriction portion 22 into which the protrusion side constriction portion 13 fits, and a back portion 23 that is positioned further back in the recess 21 than the recess side constriction portion 22 and into which the tip portion 14 fits, and the tip portion 14 is wider than the recess side constriction portion 22, and when the protrusion 12 is fitted into the recess 21, the first divided portion 10 and the second divided portion 20 are capable of relative movement in the protruding direction of the protrusion 12. The recess 21 is recessed in a direction away from the main body 11 from the edge of the second divided portion 20 on the main body 11 side (in the present embodiment, an edge 20a described below).

[0016] Here, each of the multiple split parts 30 that make up the split gasket 100 is a flat sheet-like shape (thin plate shape), and the split gasket 100 formed by combining these multiple split parts 30 is similarly also a flat sheet-like shape (thin plate shape). Combining the multiple divided parts 30 in the same layer arrangement means combining the multiple divided parts 30 by arranging them so that they overlap each other in the thickness direction, and preferably combining the multiple divided parts 30 by arranging them on the same plane. Therefore, when the protruding part 12 is fitted into the recessed part 21, the protruding part 12 and the part of the second divided part 20 surrounding the recessed part 21 overlap each other in the thickness direction, and preferably are arranged on the same plane. The protruding direction of the protruding portion 12 is the protruding direction P1 (the direction in which the protruding portion 12 protrudes from the main body portion 11) shown in Fig. 4 etc., or the opposite direction P2. The protruding direction of the protruding portion 12 is included in the planar direction of the split gasket 100 (the in-plane direction perpendicular to the normal direction). With respect to the protrusion 12, the tip side is the side away from the main body 11 (protruding direction P1 side), and the base side is the side approaching the main body 11 (opposite direction P2 side). With respect to the recess 21, the back side is the side away from the opening 21a of the recess 21, and in the case of this embodiment, when the first divided part 10 and the second divided part 20 are assembled, this side coincides with the protruding direction P1. A direction included in the planar direction of split gasket 100 and perpendicular to the protruding direction of protruding portion 12 is referred to as width direction W (see FIG. 4, etc.). That tip portion 14 is wider than recess-side narrowed portion 22 means that the dimension of tip portion 14 in the width direction is greater than the dimension of recess-side narrowed portion 22 in the width direction.

[0017] According to this embodiment, the split gasket 100 has a split structure formed by combining multiple split sections 30, and therefore, when producing the split sections 30 by punching out from plate material, the amount of waste material generated can be reduced (material waste can be reduced). Furthermore, because the tip 14 of the protruding portion 12 is wider than the recess-side constricted portion 22, when the protruding portion 12 is fitted into the recess 21, the protruding portion 12 is restricted from coming off the recess 21. Thus, it is possible to realize a split gasket 100 having a structure in which the first divided portion 10 and the second divided portion 20 are well connected. Moreover, since the first divided part 10 and the second divided part 20 are relatively movable in the protruding direction of the protruding part 12 with the protruding part 12 fitted in the recessed part 21, there is a margin (gap) in the fitting between the protruding part 12 and the recessed part 21 in the protruding direction. Therefore, the first divided part 10 and the second divided part 20 can be easily assembled.

[0018] In addition, Patent Document 1 lists various examples of shapes in the drawings, but in all of the examples, when the protrusion is fitted into the recess, the first and second divided parts are structured such that they cannot move relative to each other in the protruding direction of the protrusion.

[0019] This embodiment will be described in more detail below.

[0020] The split gasket 100 is interposed between components to seal against leakage of fluid from between the components. Applications of the split gasket 100 include automobiles, construction machinery, general industrial machinery, and the like.

[0021] The planar shape of split gasket 100 is not particularly limited, but examples include annular (circular, rectangular such as a square, or other polygonal) ring shape. In this embodiment, as shown in FIG. 5 etc., the planar shape of split gasket 100 is a rectangular ring shape, in particular a square ring shape with rounded corners. It is preferable that the thickness dimensions of the multiple segments 30 of the split gasket 100 are the same as one another, but the multiple segments 30 may include segments 30 whose thickness dimensions differ from the others. The number of split portions 30 provided in the split gasket 100 is not particularly limited as long as it is two or more, but in this embodiment, it is two. That is, in this embodiment, the split gasket 100 has only two split portions 30, that is, a first split portion 10 and a second split portion 20.

[0022] As shown in FIG. 4, in this embodiment, the protrusion 12 of the first divided portion 10 is located closer to the base end than the recess side narrow portion 22 of the recess 21 of the second divided portion 20, and has a base side wide portion 15 that is wider than the recess side narrow portion 22. As a result, the base end wide portion 15 does not enter the recess side narrow portion 22, so that a gap G1 can be secured between the edge of the second divided portion 20 on the main body 11 side and the main body 11 (the edge of the main body 11 on the second divided portion 20 side). By filling this gap G1 with a liquid gasket or the like, the sealability at the boundary between the first separated portion 10 and the second separated portion 20 can be improved. The gap G1 is preferably 1 mm or more.

[0023] The shape of the base end wide portion 15 is not particularly limited, but the base end wide portion 15 narrows (gradually or stepwise) in the protruding direction P1, for example. In the present embodiment, the base end wide portion 15 narrows gradually in the protruding direction P1. More specifically, the base end wide portion 15 is formed in an isosceles trapezoid shape, for example.

[0024] Since the first divided portion 10 has a protrusion side narrowed portion 13 and a base end side wide portion 15, and the second divided portion 20 has a recess side narrowed portion 22, when the protrusion 12 is fitted into the recess 21 and the first divided portion 10 and the second divided portion 20 are assembled together, the protrusion 12 and the recess 21 can be stably positioned relative to each other.

[0025] In the main body 11 of the first divided portion 10, the edge facing the second divided portion 20 (the edge of the main body 11 on the second divided portion 20 side) is, for example, an edge 11c extending linearly in the width direction. That is, the edge 11c extends linearly in a direction perpendicular to the protruding direction of the protruding portion 12 (protruding direction P1 or the opposite direction P2). The protruding portion side narrowed portion 13 of the first divided portion 10 is connected to the tip side of the base end side wide portion 15 . The shape of the protrusion-side narrowed portion 13 of the first divided portion 10 is not particularly limited, but in this embodiment, the protrusion-side narrowed portion 13 is formed to have a constant width and extends linearly in the protruding direction of the protrusion 12. The width of the protrusion-side narrowed portion 13 coincides with the minimum width of the base-side wide portion 15, for example.

[0026] The tip portion 14 is connected to the tip side of the protruding portion side narrowed portion 13 . The base end 18 of the tip portion 14 narrows (gradually or stepwise), for example, in the opposite direction P2. In this embodiment, the base end 18 narrows gradually in the opposite direction P2. More specifically, the base end 18 has a shape that is a mirror image of the base end wide portion 15 with respect to the protruding portion side narrowed portion 13, and is formed into an isosceles trapezoid. The minimum width dimension of the base end 18 is the same as the width dimension of the protruding portion side narrowed portion 13. The shape of the most distal end of the distal end portion 14 is not particularly limited, but is formed, for example, in a convex arc shape toward the protruding direction P1. The shape of the portion between the most extreme end of the tip 14 and the base end 18 is not particularly limited, but for example, it is formed to have a substantially constant width dimension over the range from the boundary between that portion and the base end 18 to the boundary between that portion and the most extreme end of the tip 14, and this width dimension is equivalent to the width dimension of the base end 18.

[0027] In the recess 21, the shape of the recess-side narrowed portion 22 into which the protrusion-side narrowed portion 13 fits is not particularly limited, but for example, it has a shape corresponding to the protrusion-side narrowed portion 13, i.e., a shape slightly wider than the protrusion-side narrowed portion 13, and extends linearly in the protruding direction of the protrusion 12. The innermost portion 23 of the recess 21 is connected to the innermost side of the recess-side narrowed portion 22. The shape of the innermost portion 23 is not particularly limited, but may be, for example, substantially circular. The width dimension of the recess 21 is larger than the width dimension of the recess-side narrowed portion 22.

[0028] Here, the second divided portion 20 has a second main body portion 25 and a pair of second protrusions 26 each protruding from the second main body portion 25, and the gap between the tip ends 26a of the pair of second protrusions 26 forms the recess side narrowing portion 22, and the gap between the portions 26b of the pair of second protrusions 26 closer to the base end than the tip ends 26a forms the inner portion 23. More specifically, the inner portion 23 is a region surrounded by the second main body portion 25 and the portions 26b of the pair of second protruding portions 26 that are closer to the base end than the tip ends 26a.

[0029] In this embodiment, as shown in Figure 4 etc., when the first divided portion 10 and the second divided portion 20 are assembled to each other, the gap G1 between the edge of the second divided portion 20 on the main body portion 11 side and the main body portion 11 (the edge of the main body portion 11 on the second divided portion 20 side) is larger than the gap G2 between the protrusion side narrowed portion 13 and the recess side narrowed portion 22. This ensures a sufficient amount of liquid gasket or the like to be filled into the gap G1, thereby improving the sealing performance at the boundary between the first separated part 10 and the second separated part 20. Moreover, rattling of the protrusion-side constricted part 13 relative to the recess-side constricted part 22 can be suppressed. Here, the gap G1 is larger than each of the gaps G2 on both sides of the protrusion-side narrowed portion 13 in the width direction. Preferably, the gap G1 is larger than the sum of the gaps G2 on both sides of the protrusion-side narrowed portion 13 in the width direction. In this embodiment, the edge of the second divided portion 20 on the side of the main body 11 is the edge 20a extending linearly in a direction perpendicular to the protruding direction (protruding direction P1 or the opposite direction P2) of the protruding portion 12. As described above, the edge of the main body 11 on the side of the second divided portion 20 is the edge 11c extending linearly in a direction perpendicular to the protruding direction (protruding direction P1 or the opposite direction P2) of the protruding portion 12. In this embodiment, the gap G1 is the gap between the edge 20a and the edge 11c. However, the present invention is not limited to this example, and the edge of the second divided portion 20 on the main body 11 side may intersect with the protruding direction of the protruding portion 12 at an angle other than perpendicular, or may extend in a shape other than a straight line. Similarly, the edge of the main body 11 on the second divided portion 20 side may intersect with the protruding direction of the protruding portion 12 at an angle other than perpendicular, or may extend in a shape other than a straight line. In these cases, it is preferable that the minimum value of the gap G1 between the edge of the second divided portion 20 on the main body 11 side and the main body 11 (the edge of the main body 11 on the second divided portion 20 side) is larger than the gap G2 between the protruding portion side narrowed portion 13 and the recess side narrowed portion 22.

[0030] In this embodiment, a gap G3 between the tip portion 14 and the inner peripheral edge of the inner portion 23 widens toward the tip side of the tip portion 14. This allows a sufficient amount of liquid gasket or the like to be filled between the tip side portion of the tip portion 14 and the inner peripheral edge of the rear portion 23, thereby improving the sealing performance at the boundary between the first divided portion 10 and the second divided portion 20.

[0031] In this embodiment, the maximum dimension G3MAX (FIG. 4) of the gap G3 between the tip portion 14 and the inner peripheral edge of the back portion 23 is larger than the gap G1 between the body portion 11 and the edge of the second divided portion 20 on the body portion 11 side. This also makes it possible to fill a sufficient amount of liquid gasket or the like between the tip side portion of tip portion 14 and the inner peripheral edge of rear portion 23, thereby improving the sealing performance at the boundary between first divided portion 10 and second divided portion 20. It is preferable that the maximum dimension G3MAX is 3 mm or more.

[0032] In the present embodiment, for example, as shown in Figs. 1 and 3, the first divided portion 10 and the second divided portion 20 are formed to have the same shape. For example, each of the first divided portion 10 and the second divided portion 20 has an overall L-shape. The first divided portion 10 has a protrusion 12 at one end and a recess 21 at the other end. Similarly, the second divided portion 20 has a protrusion 12 at one end and a recess 21 at the other end. That is, one end of the first divided portion 10 has a main body portion 11 and a protruding portion 12 protruding from the main body portion 11. The other end of the first divided portion 10 has a second main body portion 25 and a pair of second protruding portions 26 protruding from the second main body portion 25. Similarly, one end of the second divided portion 20 has a main body portion 11 and a protruding portion 12 protruding from the main body portion 11, and the other end of the second divided portion 20 has the second main body portion 25 and a pair of second protruding portions 26 protruding from the second main body portion 25. Then, as shown in Figure 3, the first divided part 10 and the second divided part 20 are assembled so that the protrusion 12 of the first divided part 10 fits into the recess 21 of the second divided part 20 and the protrusion 12 of the second divided part 20 fits into the recess 21 of the first divided part 10. In the present embodiment, when the first divided section 10 and the second divided section 20 are assembled, the protruding direction of the protruding portion 12 of the first divided section 10 and the protruding direction of the protruding portion 12 of the second divided section 20 are aligned with each other. This makes it easier for the first divided section 10 and the second divided section 20 to move relative to each other when the first divided section 10 and the second divided section 20 are assembled.

[0033] 5 and 6, for example, the liquid gasket 40 is filled over the entire gaps G1, G2, and G3. This can improve the sealing performance at the boundary between the first separated portion 10 and the second separated portion 20. The liquid gasket 40 may be applied to one or both surfaces of the divided portion 30 (the first divided portion 10, the second divided portion 20). For example, a material containing silicone rubber as a main component can be used as the liquid gasket 40. The liquid gasket 40 becomes a rubber-like elastic body after curing, and therefore exhibits good vibration resistance and impact resistance.

[0034] As shown in FIG. 7, a split gasket 100 may have an inner periphery elastic body 50 formed in an annular shape along the inner periphery of the annular shape. The inner circumference elastic body 50 can be formed after combining multiple divided sections 30 in the same layer arrangement (combining the first divided section 10 and the second divided section 20 in the same layer arrangement) and filling the boundaries between the divided sections 30 (in the gaps G1, G2, and G3) with liquid gasket 40. The inner circumferential elastic body 50 is intended mainly to improve sealing performance, and is made of, for example, nitrile rubber. The cross-sectional shape of the inner periphery side elastic body 50 is not particularly limited, and may be a circular shape as shown in Fig. 8(a) and Fig. 8(b), an elliptical shape, a rectangular shape, or other shapes. However, the split gasket 100 does not necessarily have to have the inner periphery elastic body 50 .

[0035] 8(a), each divided portion 30 has, for example, a metal base material 31 and a covering portion 32 formed of an elastic material covering the base material 31. That is, each of the first divided portion 10 and the second divided portion 20 has the base material 31 and the covering portion 32, and the base material 31 is coated with the covering portion 32. The covering portion 32 may be formed only on the base material 31, or may be formed on both sides of the base material 31, or may be formed on the entire outer surface of the base material 31 (the entire periphery). However, the present invention is not limited to this example, and each divided portion 30 may have a structure not including a covering portion 32, for example, as shown in FIG. 8(a). Although Fig. 8(a) and Fig. 8(b) both show the cross-sectional structure of the second divided section 20 as an example, the cross-sectional structure of the first divided section 10 is similar.

[0036] The substrate 31 can be made of a stainless steel plate, a cold-rolled steel plate, a galvanized steel plate, an aluminum plywood, or the like. The elastic material constituting the covering portion 32 is a material (rubber-like elastic body) with high elasticity such as rubber (synthetic rubber or natural rubber) or thermoplastic elastomer (thermoplastic resin rubber elastic body), and has flexibility. Examples of the material of the covering portion 32 include a synthetic rubber sheet (including foamed rubber) containing at least one of nitrile rubber, styrene butadiene rubber, fluororubber, acrylic rubber, and silicone rubber. For example, after providing a primer layer on the surface of the substrate 31, an adhesive layer can be formed on the surface of the substrate 31 via the primer layer, and then the coating portion 32 can be formed on the substrate 31 via the primer layer and the adhesive layer.

[0037] Next, the mounting structure of the split gasket according to this embodiment will be described with reference to FIG. The mounting structure of the split gasket in this embodiment is a mounting structure of the split gasket in which the split gasket 100 in this embodiment is interposed between a first member 210 and a second member 220, and the first member 210 and the second member 220 are fixed (e.g., fastened) to each other, and the protrusion 12 of the first split portion 10 is fitted into the recess 21 of the second split portion 20, and a liquid gasket 40 is filled in the gap G3 between the tip portion 14 and the inner peripheral edge of the rear portion 23, and in the gap G2 between the protrusion side narrowed portion 13 and the recess side narrowed portion 22.

[0038] In this embodiment, when fitting the protrusion 12 into the recess 21, the first divided portion 10 and the second divided portion 20 are positioned at different positions in the thickness direction so that they do not overlap in the thickness direction, and the first divided portion 10 and the second divided portion 20 are aligned so that the protrusion 12 and the recess 21 overlap in a planar view, and the first divided portion 10 and the second divided portion 20 are aligned in the thickness direction to fit the protrusion 12 into the recess 21. However, in the case of this embodiment as well, as in the second embodiment described below, the protrusion 12 may be fitted into the recess 21 by pushing the protrusion 12 into the recess 21 with the first divided portion 10 and the second divided portion 20 arranged in the same layer. Moreover, the split gasket 100 is sandwiched in a compressed state (compressed in the thickness direction) between the first member 210 and the second member 220. That is, the split gasket 100 is sandwiched between the first member 210 and the second member 220 while being compressed in a direction perpendicular to the surface of the split gasket 100.

[0039] Next, an example of a method for producing the split gasket 100 will be described. Each of the multiple divided sections 30 made from a metal plate material by pressing or the like is provided with a base treatment agent layer on its surface, and then immersed in an adhesive tank (not shown) in which a vulcanizing adhesive is stored to coat and form the vulcanizing adhesive on the surface of the divided sections 30. The vulcanizing adhesive is then baked at a predetermined temperature, and the covering section 32 is then formed. Thereafter, the protrusions 12 and recesses 21 formed on the respective ends are fitted together to form an annular body made up of a plurality of divided portions 30. Next, the liquid gasket 40 is filled into the gaps G1, G2, and G3 at the boundaries between the divided portions 30, and is then allowed to harden. Next, using a molding die, the inner periphery side elastic body 50 is vulcanized and bonded along the inner periphery of the annular body. In this manner, a split gasket 100 having an inner circumferential elastic body 50 is obtained.

[0040] The split gasket 100 may be distributed in any of the above-mentioned states. For example, as shown in FIG. 1, the product may be distributed in a state in which a plurality of divided parts 30 (a first divided part 10 and a second divided part 20) are not yet combined. Also, as shown in Figures 5 and 6, multiple divided parts 30 (first divided part 10 and second divided part 20) may be combined and distributed with liquid gasket 40 filled in the boundaries (gaps G1, G2, G3, etc.) between the divided parts 30. 7, the product may be distributed in a state in which an inner circumferential elastic body 50 is further attached after the state shown in FIG. 5 and FIG. Furthermore, as shown in FIG. 9, the split gasket 100 may be distributed in a state in which it is interposed between a first member 210 and a second member 220.

[0041] Second Embodiment Next, a second embodiment will be described with reference to FIGS. The split gasket 100 and the mounting structure of the split gasket in this embodiment differ from the split gasket 100 and the mounting structure of the split gasket in the first embodiment described above in the points described below, but in other respects is configured in the same way as the split gasket 100 and the mounting structure of the split gasket in the first embodiment described above.

[0042] As shown in FIG. 10, in this embodiment as well, the split gasket 100 is formed by combining a plurality of split sections 30 in the same layer arrangement. In the first embodiment, an example in which the number of dividing sections 30 is two was described, but in the case of this embodiment, the number of dividing sections 30 is three or more, and in the example of Figure 10, the number of dividing sections 30 is eight. The shape of both ends of each divided portion 30 shown in FIG. 10 is a simplified shape in which the projections 12 and recesses 21 are not shown. 10, one divided portion 30 is marked with the reference number of the first divided portion 10, another divided portion 30 is marked with the reference number of the second divided portion 20, and the remaining divided portions 30 are not marked with the reference numbers of either the first divided portion 10 or the second divided portion 20. This does not necessarily mean that the split gasket 100 has only one each of the first divided portion 10 and the second divided portion 20; for example, all divided portions 30 may have a protrusion 12 at one end and a recess 21 at the other end, and each divided portion 30 may have both the function of the first divided portion 10 and the function of the second divided portion 20.

[0043] In this embodiment, the shapes of the protrusions 12 and the recesses 21 are different from those in the first embodiment, as will be described below.

[0044] 11, in this embodiment, the tip portion 14 of the protrusion 12 is formed to be wider toward the base end side. The base end portion 18 of the tip portion 14 has corners 16 on both sides in the width direction. Both corners 16 at the base end side (base end 18) of the tip portion 14 can be in point contact with an end 24 at the innermost portion 23 of the second divided portion 20 on the side of the recess-side narrowed portion 22. In other words, when viewed in a plane, the direction in which end 24 extends is different from the direction in which corner 16 and its surrounding portion at tip 14 extend, allowing corner 16 to make point contact with end 24. Note that point contact here refers to the contact relationship between corner 16 and end 24 in a plan view. Corner 16 contacts end 24 over the entire area in the thickness direction of split gasket 100, for example, and therefore corner 16 can be said to be in line contact with end 24 in a three-dimensional sense. With this configuration, a seal line can be secured between both corners 16 and the second divided portion 20, and good sealing performance can be achieved by the split gasket 100. Therefore, for example, good sealing performance can be obtained even without using the liquid gasket 40 as described in the first embodiment. In this embodiment, similarly to the first embodiment, the gaps G1, G2, and G3 may be filled with a liquid gasket 40, or the gaps G1, G2, and G3 may be filled with an adhesive.

[0045] In this embodiment, the second divided portion 20 has a second main body portion 25 and a pair of second protrusions 26 each protruding from the second main body portion 25, and the gap between the tip ends 26a of the pair of second protrusions 26 forms the recess side narrowing portion 22, and the gap between the portions 26b of the pair of second protrusions 26 located closer to the base end than the tip ends 26a forms the inner portion 23. In the present embodiment, an outer edge recess 27 recessed toward the rear portion 23 is formed in a portion of the outer edge 26c of at least one of the pair of second protrusions 26 corresponding to the portion where the rear portion 23 is formed. In other words, the outer edge recess 27 is recessed toward the inside in the width direction. As a result, as described below, when the protrusion 12 is inserted into the recess 21, the second protrusion 26 is elastically deformed, which makes it easier to widen the opening 21a of the recess 21, making it easier to insert the protrusion 12. Preferably, each of the pair of second protrusions 26 is formed with an outer edge recess 27 . Moreover, as shown in FIG. 11, it is preferable that the outer edge recess 27 is arranged on the outer edge 26c of the base side (the side closer to the second main body portion 25) of the second protrusion 26, and such a configuration makes it easier for the pair of second protrusions 26 to spread apart.

[0046] Next, a method of assembling the split gasket according to this embodiment will be described with reference to Figs. 12(a) to 12(d). The method for assembling the split gasket according to the present embodiment is a method for assembling the split gasket 100 according to the present embodiment by assembling the first split portion 10 and the second split portion 20 of the split gasket 100 to each other, and includes the following steps: <1> and <2> The process includes the steps of: <1> A process in which the first divided portion 10 is moved relative to the second divided portion 20 in the protruding direction P1 of the protruding portion 12, thereby fitting the tip portion 14 into the inner portion 23 while pushing open the opening 21a of the recess 21 with the tip portion 14 (Figures 12(a) to 12(c)). <2> After fitting the tip portion 14 into the rear portion 23, the first divided portion 10 is moved relative to the second divided portion 20 in the opposite direction P2 to the protruding direction P1 of the protruding portion 12, thereby bringing both corners 16 at the base end side (base end portion 18) of the tip portion 14 into point contact with the end portion 24 on the recess side narrowed portion 22 side of the rear portion 23 of the second divided portion 20 (Figure 12(d)). By carrying out the above steps, both corners 16 come into point contact with the end portion 24 (more specifically, for example, line contact as described above), and the seal line can be secured.

[0047] To explain the above process in more detail, as shown in FIG. 12(a), by pushing the protrusion 12 into the recess 21, the arrowhead-shaped tip 14 separates the pair of second protrusions 26 from each other, so that the pair of second protrusions 26 elastically deform and the opening 21a widens, as shown in FIG. 12(b). Here, since the outer edge recess 27 is formed on the outer edge 26c of the second protruding portion 26, the second protruding portion 26 can easily be elastically deformed. 12(c), when the tip portion 14 is completely pushed into the inner portion 23, the pair of second protrusions 26 elastically restore in the direction approaching each other, and the tip portion 14 is locked in the recess 21. That is, the width dimension of the recess-side narrowed portion 22 formed by the gap between the tips 26a of the pair of second protrusions 26 becomes narrower than the width dimension of the tip portion 14, and the tip portion 14 is prevented from coming off the inner portion 23. Thereafter, the first divided portion 10 is moved relative to the second divided portion 20 in the opposite direction P2 to the protruding direction P1 of the protruding portion 12, so that both corners 16 at the base end side (base end portion 18) of the tip portion 14 are pressed against the end portion 24 on the recess side narrowed portion 22 side at the innermost portion 23 of the second divided portion 20, thereby securing a seal line.

[0048] Here, as shown in FIG. 13, in this embodiment, each divided portion 30 (and therefore each of the first divided portion and the second divided portion) has a metal base material 31 and a covering portion 32 formed of an elastic material covering the base material 31. In this embodiment, the covering portion 32 preferably covers the entire outer surface of the base material 31 . With this configuration, the corners 16 can be made to bite into the ends 24 as shown in FIG. 13, so that the sealing performance at the point contact points between the corners 16 and the ends 24 can be further improved. However, the present invention is not limited to this example, and the divided portion 30 does not have to have the covering portion 32. In other words, the point contact between the corner 16 and the end portion 24 may be a contact between metals.

[0049] In the present embodiment, the split gasket 100 may or may not have an inner periphery side elastic body 50, as in the first embodiment.

[0050] Next, the mounting structure of the split gasket according to this embodiment will be described. As shown in Figure 14, the mounting structure of the split gasket of this embodiment is a mounting structure of the split gasket in which the split gasket 100 of this embodiment is interposed between a first member 210 and a second member 220, and the first member 210 and the second member 220 are fixed to each other, and both corners 16 at the base end side (base end 18) of the tip portion 14 are each embedded in the covering portion 32 of the end portion 24 on the side of the recess side narrowed portion 22 in the innermost portion 23 of the second split portion 20 (see Figure 13). This allows for a better seal at the contact points between the corners 16 and the ends 24 . In the case of this embodiment, since a seal line can be secured at the contact point between the corner 16 and the end 24, it is not necessary to fill the gap (gap G3, etc.) at the boundary between the first divided portion 10 and the second divided portion 20 with a liquid gasket, adhesive, etc., as shown in, for example, FIG. 14.

[0051] Third Embodiment Next, a third embodiment will be described with reference to FIGS. The split gasket 100 and the mounting structure of the split gasket in this embodiment differ from the split gasket 100 and the mounting structure of the split gasket in the first embodiment described above in the points described below, but in other respects is configured in the same way as the split gasket 100 and the mounting structure of the split gasket in the first embodiment described above. As shown in FIG. 15, in this embodiment as well, the split gasket 100 is formed by combining a plurality of split sections 30 in the same layer arrangement. The number of split portions 30 provided in the split gasket 100 in this embodiment is not particularly limited.

[0052] FIG. 15 is a plan view of a split gasket 100 in which a plurality of split portions 30, including a first split portion 10 and a second split portion 20, are assembled together. Figure 16 is a schematic cross-sectional view showing the state in which the split gasket 100 of Figure 15 is arranged between the first member 210 and the second member 220 (however, this is the state before the split gasket 100 is compressed in its thickness direction (perpendicular to the surface) by the first member 210 and the second member 220). Figures 17 and 18 are diagrams showing a mounting structure of a split gasket obtained by compressing the split gasket 100 in its thickness direction (direction perpendicular to the surface) with the first member 210 and the second member 220 after the state of Figure 16. Note that in the state of Figure 17, the split gasket 100 is compressed from the front and back by the first member 210 and the second member 220, but for convenience, the first member 210 and the second member 220 are not shown in Figure 17, and only the split gasket 100 is shown.

[0053] 15, in this embodiment, the main body 11 of the first divided portion 10 has a bead 17 extending in a direction intersecting the protruding direction P1 of the protruding portion 12, and the bead 17 traverses from end 11a to end 11b of the main body 11. In other words, the bead 17 extends between both ends of the main body 11 in the width direction W. As a result, when the first divided portion 10 is compressed between members, the beads 17 extend in a direction perpendicular to the extending direction thereof, so that the protruding portion 12 can be displaced in the protruding direction P1. Therefore, as shown in Figures 17 and 18, the gap between the tip 12a of the protrusion 12 and the inner surface of the recess 21, and the gap G1 between the edge of the second divided portion 20 on the main body portion 11 side and the main body portion 11 (the edge of the main body portion 11 on the second divided portion 20 side) are reduced, thereby ensuring good sealing at the boundary between the first divided portion 10 and the second divided portion 20. This also makes it unnecessary to apply adhesive or liquid gasket to the boundary between the first divided portion 10 and the second divided portion 20, which improves the ease of assembly of the split gasket 100. However, an adhesive or liquid gasket may be used at the boundary between the first divided portion 10 and the second divided portion 20. In that case, the adhesive or liquid gasket may protrude onto the inner or outer periphery of the split gasket 100, which is expected to further improve the sealing performance.

[0054] Here, in the present invention, the bead 17 is a protrusion formed by curving a portion of the main body 11 in an embossed manner in a direction perpendicular to the surface of the main body 11, and the bead 17 is compressed in the direction perpendicular to the surface of the main body 11 between the components, thereby elongating the main body 11 in a direction intersecting the extension direction of the bead 17.

[0055] The direction in which the bead 17 extends is not particularly limited as long as it is a direction intersecting the protruding direction P1 of the protruding portion 12. However, it is preferable that the bead 17 extends linearly in a direction perpendicular to the protruding direction P1 of the protruding portion 12, and by doing so, the amount of displacement of the protruding portion 12 can be maximized with respect to the height dimension of the bead 17 (the dimension (height difference) of the bead 17 in the thickness direction of the first divided portion 10).

[0056] In the present embodiment, as shown in Fig. 15, the bead 17 is an inclined portion in which a portion of the main body 11 is inclined in one direction (inclined downward to the left in Fig. 9). Therefore, in the main body 11, there is a height difference (a positional deviation in the thickness direction of the first divided portion 10) between a portion located on one side (e.g., the left side in Fig. 16) of the bead 17 and a portion located on the other side (e.g., the right side in Fig. 16).

[0057] FIG. 16 shows a state in which split gasket 100 in which first divided section 10 and second divided section 20 are combined is disposed between first member 210 and second member 220. As shown in FIG. Thereafter, the first member 210 and the second member 220 are brought close to each other, for example by fastening the first member 210 and the second member 220 to each other, and when the first divided portion 10 is compressed in its thickness direction (perpendicular to the surface) by the first member 210 and the second member 220, the bead 17 is crushed and the inclination of the bead 17 is eliminated, and the entire portion of the main body portion 11 including the bead 17 becomes substantially flat, as shown in FIG. 18. As a result, the main body 11 extends in a direction intersecting the extension direction of the bead 17, so that, as shown in Figure 17, the gap between the tip 12a of the protrusion 12 and the inner surface at the rear portion 23 of the recess 21, and the gap G1 between the edge of the second divided portion 20 on the main body 11 side and the main body 11 (the edge of the main body 11 on the second divided portion 20 side) narrow, thereby ensuring good sealing at the boundary between the first divided portion 10 and the second divided portion 20. In one preferred example, the bead 17 is crushed, causing the tip 12a of the protrusion 12 to be pressed against the inner circumferential surface at the back 23 of the recess 21. It is also preferred that the bead 17 is crushed, causing an edge of the second divided portion 20 on the main body 11 side (e.g., edge 20a) and an edge of the main body 11 on the second divided portion 20 side (e.g., edge 11c) to come into contact with each other or be pressed against each other. The height dimension of the bead 17 (the dimension of the bead 17 in the thickness direction of the main body 11) is not particularly limited, but is preferably, for example, not less than 0.1 mm and not more than 5 mm.

[0058] In the present embodiment, the split gasket 100 may or may not have an inner periphery side elastic body 50, as in the first embodiment.

[0059] <Modification of the third embodiment> Next, a modification of the third embodiment will be described with reference to FIGS. 19(a) and 19(b). In the above third embodiment, an example has been described in which the bead 17 is an inclined portion inclined in one direction, but the bead 17 may be a portion that is curved convexly in the thickness direction of the main body portion 11 (direction perpendicular to the surface). FIG. 19(a) shows an example in which the bead 17 is an arch-shaped (dome-shaped) curved portion. In this case as well, when the main body 11 is compressed between members in its thickness direction (direction perpendicular to the surface), the beads 17 are flattened, so that the protrusions 12 can be displaced in the protruding direction, similarly to the third embodiment.

[0060] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

[0061] For example, in the above description, an example has been described in which the divided portion 30 does not have an attachment hole for attaching the divided portion 30 to the first member 210 or the second member 220 by fastening or the like, but the divided portion 30 may have an attachment hole for attaching the divided portion 30 to the first member 210 or the second member 220 by fastening or the like. The attachment hole may penetrate the divided portion 30 from the front to the back.

[0062] The present embodiment encompasses the following technical ideas. (1) A sheet-like divided gasket formed by combining a plurality of divided sections, including a first divided section and a second divided section, in the same layer arrangement, The first divided portion has a main body portion and a protruding portion protruding from the main body portion, the second divided portion has a recess into which the protrusion is fitted, The protrusion has a protrusion side narrowed portion and a tip portion formed on a tip side of the protrusion side narrowed portion, the recess has a recess-side constricted portion into which the protrusion-side constricted portion fits, and a rear portion that is disposed on a rear side of the recess relative to the recess-side constricted portion and into which the tip portion fits, The tip portion is wider than the recessed portion, The split gasket has a structure in which, with the protruding portion fitted in the recessed portion, the first split portion and the second split portion are relatively movable in the protruding direction of the protruding portion. (2) The split gasket according to (1), wherein the protrusion has a base end side wide portion wider than the recess side narrow portion and located closer to the base end than the protrusion side narrow portion. (3) A split gasket according to (2), in which a gap between the edge of the second split portion on the side of the main body portion and the main body portion is larger than a gap between the protrusion side narrowed portion and the recess side narrowed portion. (4) A split gasket according to any one of (1) to (3), in which the gap between the tip portion and the inner peripheral edge of the innermost portion widens toward the tip side of the tip portion. (5) A split gasket as described in (4), in which the maximum dimension of the gap between the tip portion and the inner peripheral edge of the rear portion is larger than the gap between the edge of the second split portion on the side of the main body portion and the main body portion. (6) The tip portion is formed to be wider toward the base end side, A split gasket as described in any one of (1) to (3), in which both corners at the base end side of the tip portion can each be in point contact with the end portion at the rear part of the second split portion on the side of the recess-side narrowed portion. (7) The split gasket described in (6), wherein each of the first split portion and the second split portion has a metal base material and a covering portion formed of an elastic material covering the base material. (8) The second division portion is A second body portion; a pair of second protrusions each protruding from the second main body portion; having a gap between tip ends of the pair of second protrusions forms the recess-side narrow portion, A gap between the portions of the pair of second protrusions on the base end side relative to the tip ends forms the deep portion, A split gasket described in any one of (1) to (3), wherein an outer edge recess that is recessed toward the rear portion is formed in the outer edge of at least one of the pair of second protrusions at a portion corresponding to where the rear portion is formed. (9) The main body portion has a bead extending in a direction intersecting a protruding direction of the protrusion, A split gasket according to any one of (1) to (3), wherein the bead traverses the main body portion from one end to the other. (10) The split gasket according to (9), wherein the bead extends linearly in a direction perpendicular to the protruding direction of the protrusion. (11) A split gasket mounting structure in which the split gasket according to any one of (1) to (3) is interposed between a first member and a second member, and the first member and the second member are fixed to each other, The protrusion of the first divided portion is fitted into the recess of the second divided portion, A split gasket mounting structure, in which a liquid gasket is filled in a gap between the tip portion and the inner peripheral edge of the back portion, and in a gap between the protrusion side narrowed portion and the recess side narrowed portion. (12) A split gasket mounting structure in which the split gasket according to (7) is interposed between a first member and a second member, and the first member and the second member are fixed to each other, An installation structure for a split gasket, in which both corners on the base end side of the tip portion are each embedded in the covering portion of the end portion on the recess-side narrowed portion side in the innermost portion of the second split portion. (13) A method for assembling a split gasket in which the first split portion and the second split portion of the split gasket according to (6) are assembled to each other, comprising the steps of: a step of fitting the tip portion into the inner portion while widening an opening of the recess by moving the first divided portion relative to the second divided portion in a protruding direction of the protruding portion, the tip portion being pushed and widened by the tip portion; a step of fitting the tip portion into the inner portion, and then moving the first divided portion relative to the second divided portion in a direction opposite to the protruding direction of the protruding portion, thereby bringing both corners on the base end side of the tip portion into point contact with an end portion of the inner portion of the second divided portion on the side of the recess-side narrow portion; A method for assembling a split gasket comprising the steps of: [Explanation of symbols]

[0063] 100 Split Gasket 10 1st division 11 Main body 11a, 11b ends 11c Edge 12 Protrusion 12a Tip 13. Projection side constriction 14 Tip 15 Base end wide section 16 angles 17 Bead 18 Proximal end 20 Second division 20a Margin (Edge) 21 Recess 21a opening 22 Concave side constriction 23 Deep 24 End 25 Second main body part 26 Second protrusion 26a Tip 26b part 26c Outer edge 27 Outer edge recess 30 Division 31 Base material 32 Covering part 40 Liquid Gasket 50 Inner circumference elastic body 210 First member 220 Second member G1, G2, G3 Gap

Claims

1. A sheet-like divided gasket formed by combining a plurality of divided sections, including a first divided section and a second divided section, in the same layer arrangement, The first divided portion has a main body portion and a protruding portion protruding from the main body portion, the second divided portion has a recess into which the protrusion is fitted, The protrusion has a protrusion side narrowed portion and a tip portion formed on a tip side of the protrusion side narrowed portion, the recess has a recess-side constricted portion into which the protrusion-side constricted portion fits, and a rear portion that is disposed on a rear side of the recess-side constricted portion in the recess and into which the tip portion fits, The tip portion is wider than the recessed portion, A split gasket in which the first split portion and the second split portion are relatively movable in a protruding direction of the protruding portion with the protruding portion fitted in the recessed portion.

2. 2 . The split gasket according to claim 1 , wherein the protrusion has a base end wide portion that is wider than the recess side narrow portion and is located closer to the base end than the protrusion side narrow portion.

3. 3 . The split gasket according to claim 2 , wherein a gap between the body portion and an edge of the second split portion on the body portion side is larger than a gap between the protrusion-side narrowed portion and the recess-side narrowed portion.

4. The split gasket according to claim 1 , wherein a gap between the tip portion and an inner peripheral edge of the innermost portion widens toward a tip side of the tip portion.

5. 5. The split gasket according to claim 4, wherein a maximum dimension of a gap between the tip portion and an inner peripheral edge of the back portion is larger than a gap between the body portion and an edge of the second split portion on the body portion side.

6. The tip portion is formed to be wider toward the base end side, 4 . The split gasket according to claim 1 , wherein both corners on the base end side of the tip portion are capable of point contact with an end portion of the innermost part of the second split portion that is on the recess-side narrow portion side.

7. The split gasket according to claim 6 , wherein each of the first divided portion and the second divided portion has a metal base material and a covering portion formed of an elastic material and covering the base material.

8. The second division portion is A second body portion; a pair of second protrusions each protruding from the second main body portion; having a gap between tip ends of the pair of second protrusions forms the recess-side narrow portion, A gap between portions of the pair of second protruding portions on the base end side relative to the tip ends forms the deep portion, 4. A split gasket according to claim 1, wherein an outer edge recess is formed in a portion of the outer edge of at least one of the pair of second protrusions corresponding to where the deep portion is formed, the outer edge recess being recessed toward the deep portion.

9. the main body portion has a bead extending in a direction intersecting a protruding direction of the protrusion, 4. The split gasket of claim 1, wherein the bead traverses the entire length of the body portion.

10. The split gasket according to claim 9 , wherein the bead extends linearly in a direction perpendicular to a protruding direction of the protrusion.

11. A split gasket mounting structure in which the split gasket according to any one of claims 1 to 3 is interposed between a first member and a second member, and the first member and the second member are fixed to each other, The protrusion of the first divided portion is fitted into the recess of the second divided portion, A split gasket mounting structure, in which a liquid gasket is filled in a gap between the tip portion and the inner peripheral edge of the back portion, and in a gap between the protrusion side narrowed portion and the recess side narrowed portion.

12. A split gasket mounting structure in which the split gasket according to claim 7 is interposed between a first member and a second member, and the first member and the second member are fixed to each other, An attachment structure for a split gasket, wherein both corners on the base end side of the tip portion are each inserted into the covering portion of the end portion on the recess-side narrowed portion side in the innermost portion of the second split portion.

13. 7. A method for assembling a split gasket according to claim 6, comprising the steps of: assembling the first split portion and the second split portion of the split gasket to each other, the method comprising the steps of: a step of fitting the tip portion into the inner portion while widening an opening of the recess by moving the first divided portion relative to the second divided portion in a protruding direction of the protruding portion, the tip portion being pushed by the tip portion; a step of fitting the tip portion into the innermost portion, and then moving the first divided portion relative to the second divided portion in a direction opposite to a protruding direction of the protruding portion, thereby bringing both corners on the base end side of the tip portion into point contact with an end portion of the innermost portion of the second divided portion on the side of the recess-side narrow portion; A method for assembling a split gasket comprising the steps of:

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