Annular gasket, method of manufacturing the same, and method of connecting core member and elastic member

Abstract

To provide an annular gasket in which outflow of an elastic sealing material is regulated.SOLUTION: In the annular gasket 1, an elastic sealing material 2 is fixed to one surface of the inner and outer peripheries of an annular core material part 3 in which a plurality of split core materials 10 are connected by butting an end part 10a and a side 10b to each other. As the split core material 10, a material having a variation part whose shape is varied by an external force is used, and the split core materials 10 adjacent to each other are provided with an engagement part 12 in which one of the split core materials 10 is the variation part, and the other of the split core materials 10 is provided with an engagement receiving part 14, and the engagement part 12 is in a state after being varied and is engaged with the engagement receiving part 14 in a close contact state, and further variation of the engagement part 12 is regulated.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an annular gasket, a method for manufacturing the same, and a method for connecting a core material and an elastic material. [Background technology]

[0002] Many conventional annular gaskets have been proposed in which the core portion is formed by connecting a plurality of divided core members in order to effectively utilize the metal plate that is the raw material for the core portion (see, for example, Patent Document 1).

[0003] The core portion of this type of annular gasket is formed by connecting the ends of divided core materials together, and an elastic sealing material is fixed to one of the inner and outer surfaces of the core portion to form the annular gasket.

[0004] In the manufacturing process of an annular gasket using such divided core members, it is necessary to prevent the elastic sealing material from leaking out to the opposite side from between the divided core members. In other words, it is necessary to mold the divided core members so that no gaps that would allow the raw material to leak out are formed between the divided core members.

[0005] The technology in Patent Document 1 is intended for insert molding in a mold, and a constricted protrusion is formed on one end face of the butted portion between the divided core members to prevent the raw material of the elastic sealing material from flowing out. In other words, the constricted protrusion abuts against the end face of the opposing divided core member, thereby blocking the raw material of the elastic sealing material and preventing it from flowing out to the opposite side of the core member. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-133477 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the case of Patent Document 1, since it is assumed that the end faces will abut by the drawn protrusions, the tolerance for misalignment between the divided core materials is extremely small, making it difficult to manufacture the divided core materials by press punching.

[0008] The present invention has been proposed in consideration of the above circumstances, and its purpose is to provide an annular gasket in which the outflow of elastic sealing material to the opposite side is restricted, and a method for manufacturing an annular gasket and a method for connecting a core material / elastic sealing material that can easily manufacture such an annular gasket. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the annular gasket of the present invention is an annular gasket formed by connecting a plurality of divided core materials with their ends butted together, and having an elastic sealing material fixed to one of the inner and outer periphery surfaces of the annular core material portion, wherein the divided core materials are made of a material having a variable portion whose shape changes due to an external force, and the adjacent divided core materials are characterized in that, at the butt joint portion, one of the divided core materials has an engaging portion that is the variable portion, and the other of the divided core materials has an engaging receiving portion, and the engaging portion is in a tightly engaged state with the engaging receiving portion after the fluctuation, and further fluctuation of the engaging portion is restricted.

[0010] In order to achieve the above-mentioned object, the manufacturing method of the annular gasket of the present invention is a manufacturing method of an annular gasket that uses a molding die to manufacture an annular gasket consisting of a plurality of divided core materials connected by butting their ends together, with an elastic sealing material fixed to one of the inner and outer periphery surfaces of the annular core material portion, wherein adjacent divided core materials have, at the butt joint portion, an engaging portion where one of the divided core materials moves in response to an external force, and an engaging receiving portion where the other of the divided core materials engages with the engaging portion, and the adjacent divided core materials are inserted into the molding die so that, at the butt joint portion, a gap space connecting the inside and outside is created between the engaging portion and the engaging receiving portion when not subjected to the external force, and raw materials for the elastic sealing material are injected into the molding die, and the engaging portion is pressed so that the gap space is reduced by the flow of the raw materials.

[0011] In order to achieve the above-mentioned object, the core material / elastic sealing material connecting method of the present invention is a core material / elastic sealing material connecting method in which an elastic sealing material is fixed to the side of a core material part in which multiple divided core materials are connected by butting their ends together, and the adjacent divided core materials have, at the butt joint portion, an engaging portion on one side that moves in response to an external force, and an engaging receiving portion on the other side that engages with the engaging portion, and the adjacent divided core materials are inserted into the molding die so that, at the butt joint portion, a gap space communicating with the inside and outside is created between the engaging portion and the engaging receiving portion when not subjected to the external force, and the raw materials of the elastic sealing material are injected into the molding die, and the engaging portion is pressed so that the gap space is reduced by the flow of the raw materials. [Effects of the Invention]

[0012] Because the present invention has the above-described configuration and procedure, it is possible to easily prevent the elastic sealing material from flowing out to the opposite side when connecting the core material portion and the elastic sealing material, and to provide a high-quality annular gasket in which the flow of the elastic sealing material is restricted. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are a schematic plan view and a partially enlarged view of a butt joint portion of a divided core member of an annular gasket according to an embodiment of the present invention, respectively; [Figure 2] 2A and 2B are schematic explanatory views of a manufacturing method of the annular gasket, in which (a) is a partial plan view schematically showing a molding die, and (b) is a schematic longitudinal sectional view corresponding to the line XX in (a). [Figure 3] 5(a) to 5(d) are schematic partial plan views showing the molding process of the annular gasket at the butt joint portion between adjacent divided core members. [Figure 4] 10(a) and 10(b) are schematic partial plan views showing the molding process at the butt joint portion (where the gap is small) of adjacent divided core members of the annular gasket. [Figure 5] 10(a) to 10(c) are schematic partial plan views showing a molding process at the butt joint portion between adjacent divided core members of an annular gasket according to another embodiment of the present invention. [Figure 6] 1A and 1B are explanatory views of another example of a method for manufacturing an annular gasket, in which (a) is a schematic plan view of the annular gasket, and (b) is a partially enlarged view showing the manufacturing process of the butted portion of the divided core members. [Figure 7] 1A and 1B are explanatory views of another example of a method for manufacturing an annular gasket, in which (a) is a schematic plan view of the annular gasket, and (b) is a partially enlarged view showing the manufacturing process of the butted portion of the divided core members. [Figure 8] 1A and 1B are explanatory views of another example of a method for manufacturing an annular gasket, in which (a) is a schematic plan view of the annular gasket, and (b) is a partially enlarged view showing the manufacturing process of the butted portion of the divided core members. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, the basic structure of the annular gasket 1 according to the embodiment will be described.

[0015] The annular gasket 1 is an annular gasket formed by connecting multiple divided core materials 10 with their ends 10a, 10b butted together to form an annular core material portion 3, to which an elastic sealing material 2 is fixed to one of the inner and outer surfaces.

[0016] A material having a variable portion whose shape changes in response to an external force is used as the divided core material 10. At the butt joint portion 5 of adjacent divided core materials 10, one of the divided core materials 10 has an engaging portion 12 that is a variable portion, and the other divided core material 10 has an engaging receiving portion 14. After the variable state, the engaging portion 12 is tightly engaged with the engaging receiving portion 14, and further variation of the engaging portion 12 is restricted.

[0017] A specific example of the annular gasket 1 according to this embodiment is shown in Fig. 1. Fig. 1 is a schematic plan view of the annular gasket 1 and a partially enlarged view of the butt joint portion 5 between the divided core members 10. The location indicated by the thick arrow in Fig. 1 corresponds to the injection port 31a for the raw material 2a of the elastic sealing material 2 in the manufacturing method of the annular gasket 1 (see Fig. 2, etc.).

[0018] This annular gasket 1 is composed of an annular core portion 3 and an elastic sealing material 2 disposed on its inner periphery. The elastic sealing material 2 is formed by hardening raw material 2a of an elastic material. Examples of elastic materials include rubber and soft synthetic resin.

[0019] The core portion 3 is made of metal or hard synthetic resin. In this example, the core portion 3 is made of metal, and in order to save materials, instead of cutting out a ring-shaped piece from a metal plate, multiple divided core members 10 are cut out from the metal plate into linear, L-shaped, U-shaped, etc. shapes, and these divided core members 10 are joined together to form one core portion 3. The core portion 3 used in the example of Figure 1 is made of four divided core members 10.

[0020] As shown in Figure 1, the divided core materials 10 are joined so that the longitudinal ends 10a, 10b of the L-shaped or other strip-like divided core materials are butted together. To join the divided core materials 10 to other divided core materials 10 adjacent in the butting direction, an engaging portion 12 is provided on the end 10a of one divided core material 10 at the butting portion 5, and an engaging receiving portion 14 is provided on the end 10b of the other divided core material 10.

[0021] Furthermore, each of the two split core materials 10 may have an engaging portion 12 at one end 10a and an engaging receiving portion 14 at the other end 10b, but as long as engagement between the engaging portion 12 and the engaging receiving portion 14 is possible at the butt joint portion 5, there may be a split core material 10 that has an engaging portion 12 at both end portions of one split core material 10, or a split core material 10 that has an engaging receiving portion 14 at both end portions of one split core material 10.

[0022] In the annular gasket 1, at the butt joint portion 5 between adjacent divided core materials 10, the engaging portion 12 of one divided core material 10 and the engaging receiving portion 14 of the other divided core material 10 are engaged with each other, and an elastic sealing material 2 is fixed so as to cover the inner surface of the core material portion 3 including the engaging point at the butt joint portion 5.

[0023] 1, the engaging portion 12 is formed integrally with the core body 11 of the divided core 10, and has engaging pieces 12b that protrude from the end of the core body 11 and extend obliquely outward in a plan view through a neck-shaped base 12a that has a recess and is thin. By making the base 12a thin in this way, the engaging pieces 12b can be easily moved during the manufacturing process.

[0024] The engagement receiving portion 14 has an engagement receiving piece 14a that protrudes in the butting direction on the outer peripheral surface side. The engagement receiving piece 14a is formed in a shape that becomes thicker toward the tip, and an engagement recess 14b that is recessed from the inner peripheral side toward the outer peripheral side is formed on the inner surface side of the engagement receiving piece 14a.

[0025] The engaging piece 12b is engaged so that almost the entire surface of one side thereof contacts the inner surface of the engaging receiving piece 14a, i.e., the inclined bottom surface 14d of the engaging recess 14b, and an elastic sealing material 2 is filled and fixed to the opposite side of the engaging piece 12b.

[0026] At the butted portion 5, a gap 16 is formed between the end face of the core body 11 of one divided core material 10 and the end face of the engaging piece 14a of the other divided core material 10, and this gap 16 is a space that communicates with the outside. This gap 16 is not filled with the elastic sealing material 2.

[0027] In other words, this annular gasket 1 has the elastic sealing material 2 arranged only on the inner surface side of the core material portion 3, and at the butt joint portion 5, although the elastic sealing material 2 penetrates deep into the engagement recess 14b, it is not arranged so as to be exposed on the outer surface side of the core material portion 3.

[0028] The shapes of the engaging portion 12 and the engaging receiving portion 14 at the butted portion 5 in more detail, as well as the operations during the manufacturing stage, will be described in detail with reference to FIG. 2 in the explanation of the manufacturing method of the annular gasket 1.

[0029] The manufacturing method of this annular gasket 1 will be described with reference to Figures 2 and 3. Figure 2(a) is a partial plan view showing the divided core members 10 placed in the molding cavity 33 of the molding die 30 (lower die 32), and Figure 2(b) is a schematic vertical cross-sectional view corresponding to line XX in Figure 2(a). Figures 3(a) to 3(d) are schematic partial plan views showing the molding process of the annular gasket 1 at the butt joint portion 5 between adjacent divided core members 10. First, the basic steps of the manufacturing method for the annular gasket 1 will be outlined.

[0030] The manufacturing method for the annular gasket 1 is a manufacturing method using a molding die 30 to manufacture the annular gasket 1, which is formed by joining multiple divided core materials 10 with their ends 10a, 10b butted together to form an annular core material part 3, to which an elastic sealing material 2 is fixed to one of the inner and outer circumferential surfaces. Note that the manufacturing method shown in Fig. 2 is a method assuming the annular gasket 1 of Fig. 1, and the fixed surface of the elastic sealing material 2 is the inner circumferential surface of the core material part 3.

[0031] At the butt joint portion 5, one of the adjacent divided core materials 10 has an engaging portion 12 that moves in response to an external force, and the other divided core material 10 has an engaging receiving portion 14 that engages with the engaging portion 12.

[0032] First, adjacent divided core materials 10 are inserted into the lower mold 32 at the butt joint portion 5 so that a gap space 15 that communicates with the inside and outside is formed between the engaging portion 12 and the engaging receiving portion 14 without receiving any external force.

[0033] Next, raw material 2a of elastic sealing material 2 is injected into molding die 30, and the flow of raw material 2a presses engaging portion 12 so as to reduce gap space 15. Raw material 2a of elastic sealing material 2 is injected into molding die 30 through injection port 31a (see FIGS. 2(a) and 2(b)) provided in upper die 31.

[0034] Next, the detailed configuration and shape of the engaging portion 12 and the engaging receiving portion 14 at the butting portion 5 will be described in detail with reference to Fig. 2(a), which illustrates the shape of the engaging portion 12 before movement. In particular, the vicinity of the engaging recess 14b on the inner circumferential side of the engaging receiving piece 14a will be described in detail.

[0035] The engagement recess 14b is a substantially triangular space, and a sloped bottom surface 14d is formed on the open end of the recessed bottom portion 14c, which is the apex of the triangle and is the most recessed portion on the inner periphery of the engagement receiving piece 14a, and a sloped engagement surface 14e is formed on the opposite side. A mountain-shaped protrusion 14f is formed midway on the sloped engagement surface 14e, projecting toward the engagement recess 14b.

[0036] This inclined engagement surface 14e is the surface with which the tip of the engagement piece 12b comes into contact or approaches when it moves, and the part including the mountain-shaped protrusion 14f and located further inward is the first engagement receiving portion 141, while the part of the inclined engagement surface 14e located further outward than the mountain-shaped protrusion 14f and the inclined bottom surface 14d including the concave bottom portion 14c are the second engagement receiving portion 142.

[0037] On the other hand, the engagement piece 12b of the engagement portion 12 protrudes substantially parallel to the inner peripheral surface from the core body 11 of the divided core material 10. This engagement portion 12 is the aforementioned variable portion, and when the divided core material 10 is placed in the lower mold 32 before manufacturing the annular gasket 1, that is, when no external force is applied, a gap space 15 is formed between the engagement receiving piece 14a and the engagement piece 12b. In other words, when the divided core material 10 is placed in the molding mold 30, the engagement piece 12b does not fit into the engagement recess 14b, and the gap space 15 is open to the inside and outside.

[0038] All the divided core materials 10 for forming the annular gasket 1 are placed in the molding die 30, and the raw material 2a (molten material) of the elastic sealing material 2 is injected from the injection port 31a on the side of the divided core material 10 having the engagement portion 12 at the butt joint portion 5, so that the raw material 2a flows near the butt joint portion 5 and then flows toward the divided core material 10 downstream of the butt joint portion 5 (see Figures 3(a)(b)).

[0039] The flow of the raw material 2a of the elastic sealing material 2 presses the engaging piece 12b toward the engaging receiving piece 14a at the butted portion 5. The pressing force of the raw material 2a of the elastic sealing material 2 causes the engaging piece 12b to move in an inclined shape in a plan view (see FIG. 3(b)).

[0040] During the time it takes for the raw material 2a of the elastic sealing material 2 to spread from the state shown in Figure 3(b) to the entire circumference, depending on the degree of pressing force of the raw material 2a, the tip of the engaging piece 12b will either remain engaged with the first engaging receiving portion 141 as shown in Figure 3(c), or the tip of the engaging piece 12b will pass through the mountain-shaped protrusion 14f and engage with the second engaging receiving portion 142 as shown in Figure 3(d).

[0041] In this way, during the manufacturing stage of the annular gasket 1, the engaging portion 12 is displaced by pressure caused by the flow of the raw material 2a of the elastic sealing material 2, and the gap space 15 shrinks to the state shown in Figure 3(c) or Figure 3(d). Thereafter, the raw material 2a of the elastic sealing material 2 hardens, and the butted portion 5 is fixed in the state shown in the enlarged view of Figure 1 (corresponding to Figure 3(d)).

[0042] Once the annular gasket 1 is formed as shown in Figure 1, even if the engaging portion 12 has an elastic restoring force, it will not return to its original state due to the adhesion of the elastic sealing material 2. In other words, the engaging piece 12b should be designed so that it will not return to its original state due to the adhesion of the elastic sealing material 2. It is also possible that the engaging piece 12b will be plastically deformed, but in that case, it will naturally not return to its original state.

[0043] 3(c) or 3(d), the inner circumferential side of the clearance space 15 is closed, and the clearance space 15 is open only to the outer circumferential side via the gap 16. When the engagement relationship between the engagement portion 12 and the engagement receiving portion 14 is in the state of FIG. 3(c) or 3(d), the inner circumferential side of the clearance space 15 is closed, and therefore the raw material 2a of the elastic sealing material 2 does not enter the gap 16.

[0044] In other words, with this configuration of the engaging portion 12 and the engaging receiving portion 14, and this manufacturing method, it is possible to prevent the raw material 2a of the elastic sealing material 2 from flowing out through the gaps between the divided core materials 10 to the opposite side (in this example, the outer peripheral surface side).

[0045] Furthermore, as long as the above-described engagement relationship that can prevent the elastic sealing material 2 from flowing out is formed, there is no need to precisely determine the spacing between the adjacent divided core materials 10, and it is possible to have a wider gap 16, for example, as in the example of Figure 2. In other words, even when the divided core materials 10 are manufactured by press punching, the tolerances are not small, so the difficulty of manufacturing does not increase.

[0046] If gaps 16 as shown in Figures 1 to 3 are formed when a divided core material 10 with the designed dimensions is used, there is no particular problem in manufacturing the annular gasket 1 even if the spacing dimension of gaps 16 becomes smaller or larger within the specified tolerance range due to manufacturing errors in the longitudinal dimensions of the divided core material 10.

[0047] For example, as shown in Figures 4(a) and (b), even if a divided core material 10 is used in which the spacing dimension of the gap 16 is smaller than that shown in Figure 2, there is no problem because the engaging piece 12b engages with the first engaging receiving portion 141 due to the pressure of the raw material 2a of the elastic sealing material 2.

[0048] Furthermore, even if a divided core material 10 is used in which the spacing dimension of the gap 16 is larger than that shown in Figure 2, there is no particular problem as long as the engaging piece 12b is within the range in which it engages with the second engaging receiving portion 142, that is, as long as the engaging piece 12b can engage so as to contact the inclined bottom surface 14d.

[0049] In other words, in the engagement relationship between the engagement portion 12 and the engagement receiving portion 14, a dimensional tolerance for engagement is provided at the butting portion 5, so restrictions on the design of the divided core material 10 can be minimized.

[0050] Furthermore, the annular gasket 1 is in a fixed state after the engagement portion 12 has fluctuated, but the engagement portion 12 can be fluctuated by the flow of the elastic sealing material 2 during the manufacturing process, and the engagement portion 12 can be fixed by the hardening of the raw material 2a. This eliminates the need for extra effort to fluctuate or fix the engagement portion 12, allowing for efficient manufacturing.

[0051] Furthermore, in the annular gasket 1 manufactured by this manufacturing method, the elastic sealing material 2 does not flow out onto the surface opposite to the fixed surface of the core material portion 3, so there is no need to remove excess elastic sealing material 2.

[0052] Furthermore, the annular gasket 1 manufactured by this manufacturing method includes spaces such as the engagement recesses 14b and the clearance spaces 15 (including the voids 16) at the butted portions 5, which also allows for material saving.

[0053] Next, an annular gasket 1 according to another embodiment and a method for manufacturing the same will be described with reference to FIG.

[0054] In this annular gasket 1, the engagement portion 12 (engagement piece 12b) is configured as a separate body of the divided core material 10. This engagement portion 12 is rotatably attached to the end of the core material main body 11 by a movable joint portion 13. Note that the engagement receiving portion 14 in the example of Fig. 5 is the same as that in Fig. 1, and the first engagement receiving portion 141, second engagement receiving portion 142, etc. are also the same as those in Fig. 1, so detailed explanations thereof will be omitted.

[0055] As shown in Figure 5, the engagement portion 12 moves (rotates) via the movable joint portion 13, and therefore, when the raw material 2a of the elastic sealing material 2 flows during the manufacturing stage, the engagement piece 12b rotates toward the engagement receiving piece 14a due to the pressure caused by the flow.

[0056] It is desirable that the engaging portion 12 does not deform elastically. If the engaging portion 12 does not have elasticity, once it reaches the state shown in Fig. 5(c), there is no risk that the engaging portion 12 will deform and return to the state shown in Fig. 5(a) before the raw material 2a hardens and after it hardens.

[0057] The engaging portion 12 (engaging piece 12b) shown in Figures 1 and 5 has one end connected to the core material main body 11 and the other end that rotates as an open end, so it is desirable to position the divided core material 10 having the engaging portion 12 at the butt joint portion 5 upstream of the divided core material 10 having the engaging receiving portion 14 in the flow of the raw material 2a of the elastic sealing material 2.

[0058] Next, another embodiment of the manufacturing method of the annular gasket will be described with reference to Figures 6 to 8. In these figures, each (a) is a schematic plan view of the annular gasket, and each (b) is a partially enlarged view showing the manufacturing process of the butt joint portion between the divided core members. The location indicated by the thick arrow in each (a) of Figures 6 to 8 corresponds to the position of the injection port 31a for the raw material 2a of the elastic sealing material 2.

[0059] In the example of Fig. 6, an injection port 31a for the raw material 2a of the elastic sealing material 2 is provided at a position facing the inner peripheral surface of the engagement piece 12b (see Figs. 6(a) and 6(b)). Note that the position of the injection port 31a in the example of Fig. 6 is different from that in the example of Fig. 1, but the configurations of the engagement portion 12 and the engagement receiving portion 14 and their mutual positional relationship are the same as those in Fig. 1.

[0060] In the example of Fig. 6, since the injection port 31a is located opposite the engaging piece 12b, the engaging piece 12b can be pressed directly from the inner peripheral surface side and in a direction perpendicular to the longitudinal direction of the engaging piece 12b, thereby efficiently moving the engaging piece 12b. Note that, even in the example of Fig. 6, the divided core material 10 having the engaging portion 12 at the butt joint portion 5 can be said to be located upstream in the flow of the raw material 2a of the elastic sealing material 2.

[0061] In the example of Fig. 7, as shown in Fig. 7(a), the overall shape of the annular gasket 1 and the arrangement of the divided core materials are the same as those in Fig. 1, but the injection port 31a for the raw material 2a of the elastic sealing material 2 is in a different position from that in Fig. 1, specifically, on the right side in Fig. 7(a). Because of this positional relationship, taking into consideration the direction of flow of the raw material 2a and the ease of pressing against the engaging piece 12b, it is desirable that the engaging portion 12 and the engaging receiving portion 14 have a positional relationship that is left and right reversed (mirror positional relationship) from that in Fig. 1, as shown in the enlarged view of Fig. 7.

[0062] 8 shows an example of an annular gasket 1 in which the core portion 3 is disposed on the inner circumferential side and the elastic sealing material 2 is disposed on the outer circumferential side (see FIG. 8(a)). In this case, as shown in FIG. 8(b), the two divided core members 10 at the butting portion 5 may be positioned so that the engaging portion 12 is disposed on the outer circumferential side and the engaging receiving portion 14 is disposed on the inner circumferential side.

[0063] Even when considering the examples of Figures 6 to 8 above, if the engagement portion 12 (engagement piece 12b) is shaped like an on-off valve that opens and closes using the end of the core material main body 11 as a fulcrum, as shown in those examples, it is desirable to determine the injection port 31a so that the divided core material 10 with the protruding engagement piece 12b at the butt joint portion 5 is upstream of the flow of the raw material 2a of the elastic sealing material 2, as shown in those examples.

[0064] The manufacturing method of the annular gasket 1 has been described above, but the core material / elastic sealing material connection method can also be similar to the manufacturing method of the annular gasket 1 described above (see Figures 2 to 8).

[0065] That is, this core material / elastic sealing material connecting method is a connecting method in which multiple divided core materials 10 are connected by butting their ends 10a, 10b together to form a core material part 3, and an elastic sealing material 2 is fixed to the side of the core material part 3. At the butt joint part 5 of adjacent divided core materials 10, one divided core material 10 has an engaging part 12 that moves in response to an external force, and the other divided core material 10 has an engaging part 14 that engages with the engaging part 12.

[0066] This connection method involves inserting adjacent divided core materials 10 into a molding die 30 at the butt joint portion 5 so that a gap space 15 connecting the inside and outside is created between the engaging portion 12 and the engaging receiving portion 14 without any external force being applied, injecting raw material 2a of the elastic sealing material 2 into the molding die 30, and pressing the engaging portion 12 so that the gap space 15 is reduced by the flow of raw material 2a.

[0067] Therefore, this core material / elastic sealing material connection method is applicable to a method of forming a core material part 3 using a divided core material 10 in a method of fixing an elastic sealing material 2 to one side of a non-annular, strip-shaped core material part 3.

[0068] The annular gasket 1 and its manufacturing method according to the various embodiments described above are merely examples, and other methods are also acceptable. It goes without saying that the overall shape of the annular gasket 1 can be appropriately changed as a design matter. [Explanation of symbols]

[0069] 1 Annular gasket 2 Elastic sealing material 2a (Elastic sealing material) raw materials 3 Core part 5. Joint 10 Split core material 10a, 10b end 11 Core body 12 Engagement part (moving part) 12a base 12b Engagement piece 13 Movable joint part 14 Engagement receiving portion 14a Engagement piece 14b Engagement recess 14c concave bottom 14d Slanted bottom 14e Inclined engagement surface 14f chevron 141 first engagement receiving portion 142 second engagement receiving portion 15 Interstitial Space 16 void 30 mold 31 Upper mold 31a Inlet 32 Lower mold 33 Molding cavity

Claims

1. An annular gasket is formed by connecting a plurality of divided core members with their ends butted together to form an annular core member, and an elastic sealing material is fixed to one of the inner and outer periphery surfaces of the annular core member, The dividing core material is made of a material having a variable portion whose shape changes due to an external force, An annular gasket characterized in that, at the butt joint portion of adjacent divided core materials, one of the divided core materials has an engaging portion that is the fluctuating portion, and the other of the divided core materials has an engaging receiving portion, and the engaging portion is in a tightly engaged state with the engaging receiving portion after fluctuating, and further fluctuation of the engaging portion is restricted.

2. In claim 1, The annular gasket is characterized in that the engaging portion is formed integrally with the core body of the divided core material so as to extend from an end of the core body.

3. In claim 2, 1. An annular gasket, wherein the engaging portion includes an engaging piece that protrudes from a base portion in a mating direction, and the base portion is formed to be thinner than the engaging piece.

4. In claim 1, The annular gasket is characterized in that the engaging portion is attached as a separate body to the core body of the divided core material via a movable joint portion.

5. A method for manufacturing an annular gasket, which uses a molding die to manufacture an annular gasket having an elastic sealing material fixed to one of the inner and outer periphery surfaces of an annular core portion formed by connecting a plurality of divided core materials with their ends butted together, At the butted joint portion of the adjacent divided core members, one of the divided core members has an engaging portion that moves in response to an external force, and the other of the divided core members has an engaging receiving portion that engages with the engaging portion, The adjacent divided core members are inserted into the molding die so that a gap space communicating with the inside and outside is formed between the engaging portion and the engaging receiving portion at the butted portion when the external force is not applied thereto, A method for manufacturing an annular gasket, comprising injecting raw material for the elastic sealing material into the mold, and pressing the engaging portion so that the gap space is reduced by the flow of the raw material.

6. In claim 5, A method for manufacturing an annular gasket, wherein the engaging portion is formed integrally with the core body of the divided core material so as to extend from an end of the core body.

7. In claim 6, The method for manufacturing an annular gasket is characterized in that the engaging portion has an engaging piece that protrudes through a base in the butting direction, and the base is formed to be thinner than the engaging piece.

8. In claim 1, The method for manufacturing an annular gasket is characterized in that the engaging portion is attached as a separate body to the core body of the divided core material via a movable joint portion.

9. A core material / elastic seal material connecting method in which a plurality of divided core materials are connected by butting their ends together and an elastic seal material is fixed to a side surface of the core material portion, At the butted joint portion of the adjacent divided core members, one of the divided core members has an engaging portion that moves in response to an external force, and the other of the divided core members has an engaging receiving portion that engages with the engaging portion, The adjacent divided core members are inserted into the molding die so that a gap space communicating with the inside and outside is formed between the engaging portion and the engaging receiving portion at the butted portion when the external force is not applied, A method for connecting a core material and an elastic sealant, characterized in that raw material for the elastic sealant is injected into the mold, and the engaging portion is pressed so that the gap space is reduced by the flow of the raw material.

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