JP6785103B2 - Seal structure - Google Patents

Description

The present invention relates to a seal structure, particularly a seal structure using a liquid gasket (seal agent).

Conventionally, when joining two members constituting an internal combustion engine, a liquid gasket is used instead of a molded gasket between the two members, and the liquid gasket is cured to form a seal structure. This liquid gasket is cured when the cross-linking agent, which is a component thereof, comes into contact with moisture (moisture) in the air and reacts.

Patent Document 1 describes a sealing structure using a liquid gasket in which a liquid gasket is interposed between the opposing joint surfaces of two members and the liquid gasket is cured. In this seal structure, a flat surface portion and a chamfer portion recessed with respect to the flat surface portion are provided on the joint surface of one of the two members, and the chamfer portion forms a pool portion of the liquid gasket. doing.

JP-A-11-173424

When a sealing structure using a liquid gasket is used for an internal combustion engine or the like, the surface pressure of the joint surfaces of the two opposing members becomes relatively high, and it becomes difficult for air to enter between the joint surfaces. Therefore, the curing time of the liquid gasket interposed between the joint surfaces is delayed. In this respect, in the seal structure of Patent Document 1, a pool portion of the liquid gasket is provided, and the large opening shape due to the pool portion can increase the contact area between the liquid gasket and air and accelerate the curing time of the liquid gasket. ..

However, in the liquid gasket filled in the reservoir, it takes time to contact and react with the moisture in the air in the portion away from the opening of the reservoir (that is, the contact portion between the liquid gasket and the air). There was a problem that it would end up. In order to solve such a problem and improve the productivity of the production line, a seal structure capable of further promoting the curing of the liquid gasket has been desired.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seal structure capable of promoting curing of a liquid gasket in a seal structure using a liquid gasket.

In order to achieve the above object, the seal structure according to the embodiment of the present invention comprises a first member having a first joint surface and a second member having a second joint surface facing the first joint surface. The first joint surface has a flat surface portion and a chamfer portion recessed with respect to the flat surface portion, and a liquid gasket is filled between the flat surface portion and the chamfer portion and the second joint surface. In a seal structure in which a pool portion of the liquid gasket is formed by the chamfer portion and the second joint surface facing the chamfer portion, at least the first of the first member and the second member . The member is provided with a through hole that communicates with the pool portion, and the chamfer portion has an inclined portion that is connected to the flat surface portion and is inclined with respect to the flat surface portion, and a substantially flat bottom surface portion that is connected to the inclined portion. It is characterized in that one end of the through hole is located in the vicinity of the inclined portion on the bottom surface portion .
Further, the seal structure according to the embodiment of the present invention includes a first member having a first joint surface and a second member having a second joint surface facing the first joint surface, and the first joint is provided. The surface has a flat surface portion and a chamfer portion recessed with respect to the flat surface portion, and a liquid gasket is filled between the flat surface portion and the chamfer portion and the second joint surface to form the chamfer portion. In a seal structure in which a pool portion of a liquid gasket is formed by the second joint surface facing the chamfer portion, at least the second member of the first member and the second member has the pool portion. The chamfer portion has an inclined portion that is connected to the flat surface portion and is inclined with respect to the flat surface portion, and a substantially flat bottom surface portion that is connected to the inclined portion, and the through hole is provided. One end of the is located at the second joint surface facing the inclined portion.

According to this configuration, the chamfer portion can form a reservoir portion having a large opening shape between the first joint surface and the second joint surface, and at least one of the first and second members can be formed. By providing a through hole communicating with the pool portion, the contact area with air can be made larger and the curing of the liquid gasket can be promoted. In particular, by providing a through hole, the liquid gasket inside the pool portion and near the center of the joint surface, that is, the liquid gasket located at a position away from the opening portion of the pool portion, comes into contact with moisture in the air.・ The reaction time can be shortened. As a result, the curing time of the liquid gasket can be shortened and the productivity can be improved.
Further, when filling the liquid gasket between the first and second joint surfaces, the liquid gasket can be flowed along the inclined portion to fill the pool portion without a gap. Further, since the inclined portion is a portion connected to the flat surface portion and is located near the central portion of the joint surface, the liquid gasket near the central portion of the joint surface can be provided by locating one end of the through hole in the vicinity of the inclined portion. Curing can be effectively promoted.

Further, in one embodiment of the present invention, in the seal structure, the first member and the second member are joined by interposing a liquid gasket between the first joint surface and the second joint surface. It has an inner surface that forms an internal space in the state, and the through hole extends from the joint surface that forms the reservoir to the inner surface so as to communicate the reservoir and the internal space. It is a feature.

According to this configuration, when a liquid is stored in the internal space formed by the first member and the second member in the joined state of the first member and the second member, the liquid passes through the through hole to the outside of the internal space. It can be prevented from flowing out to. For example, when the internal combustion engine uses a sealing structure with a liquid gasket, lubricating oil is stored in the internal space of the internal combustion engine. The through hole extends so as to communicate between the internal space where the oil is stored and the reservoir of the liquid gasket, so that the oil flows out from between the first and second joint surfaces through the through hole to the outside of the internal space. You can eliminate the concern about

According to the seal structure according to the present invention, the contact area between the liquid gasket and air can be increased to accelerate the curing of the liquid gasket.

The schematic explanatory view of the internal combustion engine to which the seal structure which is 1st Embodiment of this invention is applied. The perspective view which shows a part of the mating surface of the left bank. Sectional drawing which shows the main part of a seal structure. A cross-sectional view illustrating the assembly of the left bank and the right bank. FIG. 3 is a cross-sectional view similar to FIG. 3 showing a seal structure according to a second embodiment of the present invention.

FIG. 1 is a schematic explanatory view of an internal combustion engine to which the seal structure 10 according to the embodiment of the present invention is applied. FIG. 1 shows a horizontally opposed engine as an example of an engine. The internal combustion engine includes a cylinder block 20, cylinder heads 22L and 22R, and an oil pan 24 that form an engine body of a horizontally opposed engine.

The cylinder block 20 is divided into left and right banks 20L and 20R, and a crankshaft (not shown) is arranged on the mating surfaces of both bank banks 20L and 20R. Cylinder heads 22L and 22R are provided at the ends of the banks 20L and 20R. The oil pan 24 is an oil storage container and is arranged on the bottom surface of the cylinder block 20.

The sealing structure 10 using the liquid gasket 15 according to the present invention includes, for example, the mating surfaces (joining surfaces) 25a and 25b of the left and right banks 20L and 20R, and the mounting surfaces (joining surfaces) between the banks 20L and 20R and the cylinder heads 22L and 22R. ) 26a, 26b and 27a, 27b, and can be applied to the mounting surfaces (joining surfaces) 28a, 28b of the cylinder block 20 and the oil pan 24. As the liquid gasket 15, for example, FIPG (Formed In Place Gasket) can be used. FIPG is used by assembling the other member to be sealed (second member) before the sealing agent applied to the joint surface of one member to be sealed (first member) is cured. In the following description, as an example, the seal structure 10 on the mating surfaces 25a and 25b of the left and right banks 20L and 20R will be described.

FIG. 2 is a perspective view showing a part of the mating surface of the left bank 20L, and FIG. 3 is a cross-sectional view showing a main part of the seal structure 10, which is left and right in the cross section taken along the line III-III of FIG. The state where the banks 20L and 20R of the above are joined is shown. The left bank 20L constitutes the first member in the seal structure 10, and the right bank 20R constitutes the second member in the seal structure 10.

The left bank 20L has a first joint surface 30 that serves as a mating surface with the right bank 20R on its peripheral surface. Further, the left bank 20L has an inner surface 31 that forms an internal space S that serves as an oil passage and a cooling water passage and an outer surface that does not form the internal space S on its peripheral surface in a joined state with the right bank 20R. 32 and.

The right bank 20R has a second joint surface 40 that is a mating surface with the left bank 20L and faces the first joint surface 30 in the installed state. The second joint surface 40 is a surface that is joined to the first joint surface 30 via the liquid gasket 15 in the installed state, and is formed to be substantially flat throughout. The right bank 20R has an inner surface 41 that forms an internal space S that serves as an oil passage and a cooling water passage in a state of being joined to the left bank 20L on its peripheral surface, and an outer surface 42 that does not form the internal space S. Has.

The first joint surface 30 has a flat surface portion 34 forming a flat surface and a chamfer portion 36 recessed with respect to the flat surface portion 34. In the first joint surface 30, the chamfer portion 36 is located on the inner side surface 31 side of the left bank 20L, that is, the side forming the internal space S, and the flat surface portion 34 is formed so as to be located on the outer surface 32 side. Is preferable.

The chamfer portion 36 has an inclined portion 36a and a bottom surface portion 36b. The inclined portion 36a is a portion that is connected to the flat surface portion 34 and is inclined with respect to the flat surface portion 34. The bottom surface portion 36b is connected to the inclined portion 36a and is formed in a flat shape substantially parallel to the flat surface portion 34. The chamfer portion 36 is provided with a through hole 50.

The through hole 50 is a hole that penetrates from the bottom surface portion 36b of the chamfer portion 36 to the inner surface surface 31, and extends substantially linearly between the bottom surface portion 36b and the inner surface surface 31. In the present embodiment, the through hole 50 has a substantially circular cross section from one end 52 to the other end 54, but the cross-sectional shape is not limited to this, and is set to an appropriate shape such as an elliptical shape or a polygonal shape. be able to. One end 52 of the through hole 50 is located in the vicinity of the inclined portion 36a on the bottom surface portion 36b. At least one through hole 50 is provided in the chamfer portion 36 facing the second joint surface 40, and in the present embodiment, the chamfer portion 36 is provided with a plurality of through holes 50. Such a through hole 50 can be formed, for example, by perforating the chamfer portion 36.

The first joint surface 30 and the second joint surface 40 are joined via a liquid gasket 15 that seals between them. Specifically, as shown in FIG. 4, the liquid gasket 15 is applied to the flat surface portion 34, and by assembling the right bank 20R, which is the second member, to the liquid gasket 15, the first joint surface is as shown in FIG. A liquid gasket 15 is filled between the 30 and the second joint surface 40. By providing the inclined portion 36a in the chamfer portion 36, the liquid gasket 15 can flow along the inclined portion 36a and be filled without a gap. The left and right banks 20L and 20R are further joined and fixed by fastening bolts inserted into the bolt holes 38 (see FIG. 2).

In the joint state shown in FIG. 3, the liquid gasket 15 is thicker between the chamfer portion 36 and the second joint surface 40 than between the flat surface portion 34 and the second joint surface 40. Reservoir 16 is formed. The through hole 50 communicates the pool portion 16 with the internal space S.

The inner diameter L of one end 52 of the through hole 50 located on the first joint surface 30 becomes smaller as the inclination angle θ of the through hole 50 becomes larger. In the present embodiment, the inclination angle θ is set in the range of about 60 to 80 degrees so that the hole diameter of the through hole 50 and the inner diameter L are substantially the same. The inclination angle θ may be set to 60 degrees or less in order to increase the inner diameter L.

The hole diameter of the through hole 50 is set so as not to hinder the filling of the liquid gasket 15 in the pool portion 16. The level that does not interfere with filling depends on the viscosity of FIPG. The flow rate Q to the through hole 50 can be calculated by the theoretical formula of laminar flow filling in the circular pipe shown in the following mathematical formula (1).

Q = (Δpπd ^ 4) / 128 μL ... (1)

Table 1 shows the difference in the amount of the liquid gasket 15 entering depending on the hole diameter of the through hole 50 obtained by the mathematical formula (1). In Table 1 and formula (1), φ is the hole diameter of the through hole 50, θ is the inclination angle of the through hole 50 (see FIG. 3), Δp is the FIPG compressive force, μ is the viscosity of FIPG, and L is the pool of the through hole 50. The contact length with the portion 16 (that is, the inner diameter L).

The amount of penetration in Table 1 was calculated by calculating the flow rate Q from the mathematical formula (1) and assuming that the assembly time of the first member and the second member was 1 second. The hole diameter φ is preferably 1 mm or less so that the amount of the liquid gasket 15 entering the through hole 50 is about 0.1 mm and air can enter the vicinity of one end 52 of the through hole 50.

In the seal structure 10 described above, a large contact area between the liquid gasket 15 and air can be secured in the opening portion 18 of the reservoir portion 16, and the liquid gasket is provided by providing a through hole 50 communicating with the reservoir portion 16. The contact area between the 15 and the air can be made larger to accelerate the curing of the liquid gasket 15.

In the conventional seal structure having no through hole 50, the liquid gasket is cured from the opening side of the reservoir, and the curing time is slower on the inner side of the reservoir away from the opening.

In the present embodiment, one end 52 of the through hole 50 is located near the inclined portion 36a, that is, on the inner side 16a side of the pool portion 16. Therefore, the time for contacting and reacting with the moisture in the air can be shortened even for the liquid gasket 15 located at a position away from the opening portion 18 of the pool portion 16. As a result, the curing time of the liquid gasket 15 can be shortened, the line speed of the production line can be increased, and as a result, the productivity can be improved.

Further, the through hole 50 extends from the chamfer portion 36 forming the pool portion 16 to the inner side surface 31 forming the internal space S. Therefore, when oil or cooling water is fluidly stored in the internal space S in a state where the left bank 20L and the right bank 20R are joined, it is possible to prevent these liquids from flowing out through the through hole 50. it can. Further, when the through hole 50 is provided in the chamfer portion 36, it is easy to provide the through hole 50 at an appropriate position that does not hinder the filling of the liquid gasket 15 according to the recessed shape of the chamfer portion 36. is there.

As described above, the seal structure 10 having the pool portion 16 and the through hole 50 described above includes the joint surfaces 26a, 26b and 27a, 27b of the cylinder block 20 and the cylinder heads 22L and 22R, and the cylinder block 20 and the oil pan. It can be applied to the joint surfaces 28a and 28b of. Further, it can be applied to the joint surface of other members constituting the internal combustion engine.

FIG. 5 is a cross-sectional view similar to FIG. 3 showing the seal structure 10 according to the second embodiment of the present invention. In FIG. 5, the parts corresponding to the first embodiment are designated by the same reference numerals, and detailed description of the same configuration as that of the first embodiment in the second embodiment will be omitted. In the second embodiment, the through hole 50 is provided in the right bank 20R which is the second member.

The through hole 50 extends from the second joint surface 40 formed in a plane to the inner side surface 41 forming the internal space S. One end 52 of the through hole 50 is located at a position communicating with the pool portion 16 in the joined state, that is, at a region facing the chamfer portion 36 on the second joint surface 40. One end 52 of the through hole 50 is preferably located in the vicinity of the inclined portion 36a, and in the present embodiment, the one end 52 is located in a region of the second joint surface 40 facing the inclined portion 36a.

In this way, by providing the through hole 50 communicating with the reservoir 16 in the second member, the liquid gasket 15 filled in the reservoir 16 can be cured in the same manner as in the case where the first member is provided with the through hole 50. Can be promoted.

The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the through hole 50 is provided in either the first member or the second member, but the through hole 50 may be provided in both the first member and the second member. As a result, the contact area between the liquid gasket 15 and the air can be made larger, and the curing of the liquid gasket 15 can be promoted.

10 Seal structure 15 Liquid gasket 16 Reservoir 18 Opening part 20 Cylinder block 20L Left bank (first member)
20R right bank (second member)
30 1st joint surface 31 Inner surface 34 Flat surface part 36 Chanfa part 36a Inclined part 36b Bottom part 40 2nd joint surface 50 Through hole 52 One end of through hole S Internal space

Claims (3)

The first member having the first joint surface and
A second member having a second joint surface facing the first joint surface is provided.
The first joint surface has a flat surface portion and a chamfer portion recessed with respect to the flat surface portion.
A liquid gasket is filled between the flat surface portion and the chamfer portion and the second joint surface, and a pool portion of the liquid gasket is formed by the chamfer portion and the second joint surface facing the chamfer portion. In the seal structure to be
Of the first member and the second member, at least the first member is provided with a through hole communicating with the pool portion .
The chamfer portion has an inclined portion that is continuous with the flat surface portion and is inclined with respect to the flat surface portion, and a substantially flat bottom surface portion that is connected to the inclined portion.
A seal structure characterized in that one end of the through hole is located in the vicinity of the inclined portion on the bottom surface portion . The first member having the first joint surface and
A second member having a second joint surface facing the first joint surface is provided.
The first joint surface has a flat surface portion and a chamfer portion recessed with respect to the flat surface portion.
A liquid gasket is filled between the flat surface portion and the chamfer portion and the second joint surface, and a pool portion of the liquid gasket is formed by the chamfer portion and the second joint surface facing the chamfer portion. In the seal structure to be
Of the first member and the second member, at least the second member is provided with a through hole communicating with the pool portion.
The chamfer portion has an inclined portion that is continuous with the flat surface portion and is inclined with respect to the flat surface portion, and a substantially flat bottom surface portion that is connected to the inclined portion.
A seal structure characterized in that one end of the through hole is located on the second joint surface facing the inclined portion . The first member and the second member have an inner surface that forms an internal space in a joined state in which a liquid gasket is interposed between the first joint surface and the second joint surface.
The seal structure according to claim 1 or 2, wherein the through hole extends from a joint surface forming the pool portion to the inner surface surface so as to communicate the pool portion and the internal space. ..

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