JP6799879B1 - Flange with gasket and gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bead of a gasket from being damaged or deformed to impair the sealing property when a pipe of an exhaust system of an internal combustion engine is connected by using a flange with a gasket. The gasket 20 is positioned and coupled to the sealing surface 13 of the flange 10 for connecting the pipe of the exhaust system of the engine, and is integrally provided to form the flange 1 with a gasket. The gasket 20 is provided only in a predetermined region smaller than the outer shape of the flange 10 including an effective sealing region on the peripheral edge of the port hole 11 which is an exhaust passage on the sealing surface 13. A portion 24 to be connected to the flange was provided in the extending portion 25 extending outward from the outer peripheral portion 20a of the gasket 20, and a through hole 26 was formed between the portion 24 and the region where the bead 23 was formed. A notch may be formed in place of the through hole 26. [Selection diagram] Fig. 4

Description

The present invention relates to a flange with a gasket and a gasket for connecting a pipe of an exhaust system of an internal combustion engine such as an automobile.

When connecting the pipes of the exhaust system of an internal combustion engine in an automobile or the like, generally, flanges are fixed to the ends of the pipes (pipes) on the connected side and the connected side, and the flanges are connected to each other as a gasket (also called packing). The method of connecting by sandwiching and tightening with bolts and nuts is adopted.
For example, as shown in FIG. 23, the end of the connected pipe 101 and the end of the connected pipe 102 are fitted into the openings 201a and 202a of the flanges 201 and 202, respectively, and are fitted on the outer circumferences of the pipes 101 and 102, respectively. The flanges 201 and 202 are fixed. The fixing is usually performed by welding over the entire circumference. In FIG. 23, the cross section of the welded portion is shown by a small black triangle.

Then, a gasket 300 having the same planar shape as the flanges 201 and 202 is sandwiched between the sealing surfaces 201b and 202b, which are the opposing joint surfaces of the flanges 201 and 202, and a plurality of the flanges 201 and 202 are sandwiched between the flanges 201 and 202. Tighten evenly with bolts 400 and nuts 500. Thereby, the pipe 101 and the pipe 102 can be airtightly connected.
The flange is a type of piping joint, and in addition to the above-mentioned connection between pipes, the pipe is directly connected to the suction port and discharge port of equipment that sucks or discharges fluid such as engine cylinder blocks and cylinder heads. It is also used when doing.

The material of the flange varies depending on the application, but generally a metal such as carbon steel or alloy steel is used.
Gaskets include soft gaskets made of rubber or resin, and metal gaskets (metal gaskets) formed by punching out metal plates such as stainless steel and aluminum. The connection part of the exhaust pipe in the exhaust system of the internal combustion engine. A metal gasket is used for the connection part that becomes hot like.

The flange used for connecting such pipes has a shape peculiar to each vehicle type in order to prevent the exhaust gas from flowing out to the outside and from the shape near the internal combustion engine. The gaskets were also individually made according to the shape of the flange. The flange and gasket were assembled at the time of assembling the final product such as a car, and the exhaust pipe and the like were connected as described above.
The positioning of the flange and the gasket was performed by passing a bolt through a bolt hole formed at a corresponding position of the flange and the gasket at the time of assembly.

In order to prevent forgetting to assemble the gasket in such a conventional pipe connection structure, and to reduce the size and standardization of the gasket, the present inventor has previously described the connection of the gasket with the gasket and the pipe described in Patent Document 1. Proposed a method.
The flange with gasket is integrated with the flange by positioning and coupling the bead-formed gasket to the sealing surface of the flange, and the gasket is effective at the peripheral edge of the opening that serves as an exhaust passage on the sealing surface of the flange. It is provided only in a predetermined area including the sealing area and smaller than the outer shape of the flange.

Japanese Patent No. 662191

Conventional common flanges and gaskets for pipe connection were designed separately and manufactured by different manufacturers. Therefore, there is little mutual information, excessive performance is required to obtain sufficient airtightness, and extra cost is incurred.
In addition, the gasket usually has a bead or the like formed on the peripheral edge of an opening (port hole) that serves as an exhaust passage to enhance the packing effect, but it is the flange that determines the relative position between the gasket and the flange. It was only a bolt for connecting.

However, when, for example, an M10 (Φ10 mm) bolt is used, the diameter of the bolt hole formed in the flange and the gasket is about Φ11 mm for ease of attachment. Since the bolt hole is a positioning hole, the position of the gasket with respect to the flange, that is, the position of the bead has a degree of freedom of 0.5 mm in all directions, which may reduce the packing effect.

Furthermore, in the case of cars, the flanges and gaskets have been combined in the final assembly process of the finished car manufacturer, so the possibility of forgetting to assemble could not be eliminated.
Therefore, the outer shape and size of the gasket were matched with the plane shape of each flange so that the existence of the gasket could be confirmed from the outside after assembly. Therefore, the gasket should not only be larger than necessary but also standardized. It was not possible, and extra costs were incurred in material costs and design.

On the other hand, these problems can be solved by connecting the pipes of the exhaust system of the internal combustion engine by using the flange with a gasket described in Patent Document 1.
That is, since the relative positioning of the flange and the gasket can be performed accurately in advance without depending on the bolt at the time of assembly, the displacement around the opening which is the exhaust passage is eliminated and the packing effect of the gasket is maximized. It can be demonstrated. In addition, the risk of forgetting to attach the gasket can be eliminated.
Further, it is not necessary to make it possible to confirm the existence of the gasket from the outside after assembly, and it is not necessary to provide bolt holes in the gasket. Therefore, since it is only necessary to provide the gasket on the sealing surface of the flange only in the area required for the sealing and the positioning connection, it is possible to standardize the gasket based on the diameter of the opening, which greatly reduces the cost. can do.

However, when used to connect the pipes of the exhaust system of an internal combustion engine, the flange is generally made of iron (steel) and the gasket is made of different metals such as stainless steel and aluminum, so the coefficient of thermal expansion is different, and the gasket is usually better. The coefficient of thermal expansion is large. Since high-temperature exhaust gas flows through the connected pipe, the flange and gasket expand and contract due to the heat. In addition, the gasket expands and contracts due to external factors such as vibration of the internal combustion engine. The gasket has a particularly large expansion and contraction of the bead forming portion. Therefore, if the gasket is coupled to the sealing surface of the flange, the relative expansion and contraction of the gasket with respect to the flange is hindered, and the bead may be deformed to impair the sealing property.

The present invention has been made in view of such circumstances, and an object of the present invention is to enable the bead of the gasket to exhibit sufficient sealing properties even when the gasket is connected to the flange.

The flange with a gasket according to the present invention includes a flange and a gasket, and the flange is a flange for connecting a pipe of an exhaust system of an internal combustion engine. The gasket is a gasket having a bead, and a sealing surface of the flange. It is positioned and coupled to the flange and integrated with the flange.
The gasket includes an effective sealing area at the peripheral edge of an opening (port hole) serving as an exhaust passage on the sealing surface of the flange, is provided only in a predetermined area smaller than the outer shape of the flange, and a portion to be connected to the flange is provided. , It is located on the outer peripheral side of the region where the bead is formed, and a through hole or a notch is formed between the portion and the region where the bead is formed.

Depending on the relative expansion and contraction and / or deformation of the gasket with respect to the flange, the periphery of the through hole or notch in the gasket may be deformed so as to absorb the expansion and contraction and / or deformation .
A plurality of the above-mentioned openings are formed in the above-mentioned flange with a gasket at intervals, and each of the plurality of openings is individually provided for each predetermined area including an effective sealing area at the peripheral edge of the opening. The gasket may be positioned and coupled to.

In these flanges with gaskets, the gasket has an extension portion extending outward from the outer circumference, the extension portion has a portion to be connected to the flange, and the through hole or the notch portion is provided inside the portion. It is good to form.
Alternatively, the gasket has a portion to be connected to the flange in the vicinity of the outer circumference, and extends as a through hole at a predetermined angle with respect to the radial direction between the portion and the region where the bead is formed. A hole may be formed, or a notch extending from the outer circumference at a predetermined angle with respect to the radial direction may be formed as the notch.

In these flanges with gaskets, a recess is formed in a predetermined region of the sealing surface of the flange including the portion to be joined with the gasket, and the portion of the gasket to be joined with the flange is spot-welded to the flange in the recess. It should be combined.

The gasket according to the present invention is a gasket that is positioned and coupled to the sealing surface of the flange for connecting the pipes of the exhaust system of the internal combustion engine, and is an effective seal of the peripheral edge of the opening that serves as the exhaust passage on the sealing surface of the flange. It has a shape including a region and corresponds to a predetermined region smaller than the outer shape of the flange, and a bead is formed in the region corresponding to the effective seal region.
The portion to be connected to the flange is on the outer peripheral side of the region where the bead is formed, and a through hole or a notch is formed between the portion and the region where the bead is formed.

Depending on the relative expansion and contraction and / or deformation of the gasket with respect to the flange, the periphery of the through hole or notch in the gasket may be deformed so as to absorb the expansion and contraction and / or deformation .
The gasket can be formed in the same manner as each gasket in the flange with gasket.

According to the present invention, even when the gasket is connected to the flange, the bead of the gasket can exhibit sufficient sealing property.

It is a top view of the flange used in 1st to 3rd Embodiment of this invention. It is a top view of the gasket used in the 1st Embodiment of this invention. It is an enlarged plan view of the extension part in the gasket shown in FIG. It is a top view which shows the flange with a gasket of 1st Embodiment of this invention. It is sectional drawing which follows the YY line of FIG. It is a top view of the gasket used in the 2nd Embodiment of this invention. It is a top view which shows the flange with the gasket of the 2nd Embodiment of this invention. It is a top view of the gasket used in the 3rd Embodiment of this invention. It is a top view which shows the flange with the gasket of the 3rd Embodiment of this invention. It is a top view of the flange with a gasket when the joint part of the gasket and the flange in 2nd Embodiment of this invention is made into one place. It is a top view of the flange with a gasket when the joint part of the gasket and the flange in 3rd Embodiment of this invention is made into 2 places. 12A is an enlarged plan view of a portion provided with a recess for connecting the gasket to the sealing surface of the flange, FIG. 12B is a sectional view taken along the line AA of FIG. 12A, and FIG. 12C is a line BB of FIG. 12A. It is a cross-sectional view along. 13A is an enlarged plan view showing an example of the joint portion between the flange and the gasket, FIG. 13B is a sectional view taken along the line AA of FIG. 13A, and FIG. 13C is a sectional view taken along the line BB of FIG. 13A. FIG. 5 is an enlarged cross-sectional view of the vicinity of the joint portion when the gasket according to the first embodiment of the present invention is joined to the sealing surface of the flange by spot welding. It is also a plan view of the vicinity of the joint. It is a top view of the vicinity of the joint part when the gasket in the 3rd Embodiment of this invention is joined to the sealing surface of a flange by spot welding. It is a top view of the flange used in the 4th Embodiment of this invention. It is a top view of the gasket used in the 4th Embodiment of this invention. It is a top view which shows the flange with the gasket of the 4th Embodiment of this invention. It is explanatory drawing of the EGR system to which this invention is applied. It is a top view of the flange used in the 5th Embodiment of this invention. It is a top view of the gasket used in the 5th Embodiment of this invention. It is sectional drawing which follows the axis direction of the pipe of the part which connected pipes to each other by using the conventional metal flange and gasket.

Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings.
[First Embodiment]
First, the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
1 and 2 are plan views of the flange and the gasket used in the first embodiment, respectively, FIG. 3 is an enlarged plan view of an extension portion of the gasket, and FIG. 4 is a positioning coupling of the gasket to the sealing surface of the flange. It is a plan view of the flange with a gasket integrated with each other, and FIG. 5 is a cross-sectional view taken along the YY line.

The flange 10 shown in FIG. 1 is a flange for connecting pipes in the exhaust system of an internal combustion engine. In this example, the three sides of an equilateral triangle having a planar shape curved outward, and each top is rounded. It has an attached shape, and an opening (hereinafter referred to as a “port hole”) 11 is formed in the central portion of the central portion by inserting a cylindrical pipe to be connected to serve as an exhaust passage. In addition, bolt holes 12 for passing bolts for assembly are formed at three locations near each top.

The flange 10 is a thick plate-shaped flange as shown in FIG. 5 described later, and is formed of a heat-resistant metal material such as carbon steel or alloy steel mainly composed of iron. Then, one of the planes shown in FIG. 1 is a seal surface (also a joint surface) 13 that faces the joint surface (also a seal surface) of the connected member when connected to the other side connected member. ..
The "contact member on the other side" as used in this specification includes not only a flange fixed to a pipe on the other side to be connected, but also a cylinder block or a cylinder head having an exhaust hole, a muffler (silencer), or an exhaust purification device. The exhaust system members such as the above, and the flange provided on the EGR cooler in the EGR system are also included.

In order to make the connection of the flange 10 with the pipe fitted into the port hole 11 more secure, a hub that protrudes with the same inner diameter as the port hole 11 may be formed on the surface opposite to the sealing surface 13. A flange provided with such a hub is referred to as a hub flange, and a flange without a hub is referred to as a plate flange.
On the sealing surface 13 of the flange 10, the annular region between the inner circumference of the port hole 11 and the circular virtual line C shown in FIG. 1, that is, the peripheral edge of the port hole 11 (opening) is the mating member to be connected. It is an effective seal area 13a when connecting with.

Then, a portion (indicated by x) 14 to be connected to the gasket is provided on the outer portion of the effective sealing region 13a on the sealing surface 13. In this example, the portions 14 are provided at three locations at equal angular intervals along the circumferential direction of the port hole 11, but may be provided at one location, two locations, or four or more locations.

The gasket 20 shown in FIG. 2 has an annular planar shape, and a port hole 21 is formed at a position corresponding to the port hole 11 of the flange 10, but a bolt hole is not formed. The gasket 20 includes an effective sealing region 13a on the peripheral edge of the port hole 11, which is an opening serving as an exhaust passage on the sealing surface 13 of the flange 10, and has a shape corresponding to a predetermined region smaller than the outer shape of the flange 10. .. The gasket 20 has a bead 23 formed in a portion of the flange 10 corresponding to the effective sealing region 13a to enhance the packing effect.

The gasket 20 is manufactured by pressing a metal plate having heat resistance and springiness such as stainless steel or aluminum having a predetermined thickness (for example, about 0.2 mm to 1.0 mm).
The gasket 20 is provided with three extending portions 25 so as to include a portion corresponding to each portion 14 to which the gasket of the flange 10 is to be connected. Each of the extending portions 25 protrudes outward in the radial direction from the outer circumference of the gasket 20.
A portion (indicated by x) 24 to be connected to the flange is provided near the tip of each of the extending portions 25. The portion 24 to be connected to the flange is a portion corresponding to the portion 14 to which the gasket of the flange 10 is to be connected, and is located on the outer peripheral side of the region where the bead 23 is formed, and the portion 24 to be connected to the flange and the bead 23. A through hole 26 is formed between the region and the region where the is formed.

In the gasket 20 shown in FIG. 2, as shown in an enlarged manner in FIG. 3, a through hole is formed inside the extension portion 25 (on the base side of the extension portion 25) in the vicinity of the portion 24 connected to the flange in each extension portion 25. 26 is formed. Each of the through holes 26 is an elongated hole extending in the direction of the outer circumference 20a excluding the extending portion 25 of the gasket 20, and both end portions thereof extend somewhat in the projecting direction of the extending portion 25. As a result, as shown in an enlarged manner in FIG. 3, each extending portion 25 is formed with a pair of narrowed portions 25a that are more easily deformed than the other portions.
The gasket 20 is the first embodiment of the gasket according to the present invention.

Then, on the sealing surface 13 of the flange 10 shown in FIG. 1, the gasket 20 shown in FIG. 2 is aligned with the position 14 to be connected to the gasket of the flange 10 and the position 24 to be connected to the flange of the gasket 20. They are placed on top of each other, and they are positioned and coupled by clinching or welding, which will be described later, to integrate them. Thereby, the flange 1 with a gasket shown in FIGS. 4 and 5 can be manufactured.
Specific examples of the joint portion between the flange 10 and the gasket 20 will be described later with reference to FIGS. 12 to 15.

As shown in FIG. 23, the flange 1 with a gasket in which the gasket 20 is positioned and coupled in advance to the sealing surface 13 of the flange 10 is fixed to the end of the pipe to be connected. After that, the flange 10 of the flange with gasket 1 and the connected member such as a flange fixed to the end of the pipe on the other side are joined with the gasket 20 sandwiched between them, and assembled with bolts and nuts. Thereby, the pipes or the pipes and other members having exhaust holes can be airtightly connected to each other.

If you connect the pipe of the exhaust system of the internal combustion engine using this flange with gasket, the flange and gasket are positioned and connected and integrated, so you will never forget to attach the gasket in the process of connecting the pipe at the finished vehicle manufacturer. Can be. In addition, since the relative positioning of the flange and the gasket can be performed accurately in advance without depending on the bolt at the time of assembly, the displacement around the port hole can be eliminated and the packing effect of the gasket can be maximized. ..
Further, since the flange and the gasket can be designed and manufactured by the same manufacturer, they can be accurately positioned and coupled, and excessive performance can be suppressed while the required performance can be sufficiently achieved, and the cost can be reduced.

Moreover, since it is not necessary to make it possible to confirm the existence of the gasket from the outside after assembly and it is not necessary to provide bolt holes in the gasket, the planar shape and size of the gasket are limited to the area required for sealing and positioning connection. .. Therefore, regardless of the outer shape of the flange, it is possible to standardize the gasket based on the diameter of the port hole, and it is possible to significantly reduce the material cost of the gasket and the design / manufacturing cost.

Here, when high-temperature (for example, about 700 ° C.) exhaust flows through the connected pipe, the flange 10 and the gasket 20 each thermally expand, but since the materials are different, the expansion coefficients are different, and the gasket 20 is relative to the flange 10. Expansion and contraction occurs. Further, when the bead 23 of the gasket 20 absorbs an impact due to vibration of an internal combustion engine or the like, the position of the gasket 20, particularly near the outer circumference, fluctuates relative to the flange 10 due to the deformation of the bead 23. ..
On the other hand, the gasket 20 is fixed to the flange 10 by a plurality of portions 24, and the distance between these portions 24 can fluctuate only to the same extent as the expansion of the flange 10. Therefore, if the gasket 20 is expanded or contracted or deformed, the entire gasket 20 is distorted, which may cause breakage or irreversible deformation.

However, in the gasket 20 of this embodiment, since the through hole 26 is provided in the vicinity of the portion 24 to be connected to the flange 10 to make the peripheral portion more easily deformed than other portions, the above expansion and contraction and deformation occur. If there is, the peripheral portion of the through hole 26 can be slightly deformed so as to absorb the expansion and contraction and the deformation so that the other portion is not distorted. In other words, the stress generated by the relative expansion and contraction and deformation of the gasket 20 with respect to the flange 10 can be released.
Therefore, the gasket 20 is not subjected to a biased load, and the bead 23 is not damaged or deformed to impair the sealing performance. In this gasket 20, in particular, the portion 25a (see FIG. 3) narrowed by the through hole 26 in each extending portion 25 is more easily deformed than the other portions, and this portion 25a is relative to the flange 10 of the gasket 20. It deforms to absorb the expansion and contraction and / or deformation.
Even if a plurality of circular through holes are arranged in the circumferential direction instead of forming the through holes 26 having elongated holes along the circumferential direction in each of the extending portions 25 of the gasket 20, the flange 10 of the gasket 20 is formed. A portion that deforms so as to absorb relative expansion and contraction and / or deformation can be provided.

[Second Embodiment]
Next, the second embodiment of the present invention will be described with reference to FIGS. 6 and 7.
The flange 10 shown in FIG. 1 is also used as the flange of the second embodiment. FIG. 6 is a plan view of the gasket used in the second embodiment, and FIG. 7 is a plan view of a flange with a gasket in which the gasket is positioned and coupled to the flange shown in FIG.

The gasket 30 shown in FIG. 6 is also a gasket having the same function as the gasket 20 shown in FIG. 2, and a port hole 31 which is an opening serving as an exhaust passage corresponding to the port hole 11 of the flange 10 is formed in the central portion. Has been done. Further, in the peripheral portion of the port hole 31 in the gasket 30, a bead 33 for enhancing the packing effect is formed in a portion corresponding to the effective sealing region 13a of the flange 10.
The planar shape and size of the gasket 30 also include the effective sealing region 13a of the peripheral edge of the port hole 11 on the sealing surface 13 of the flange 10, and have a shape corresponding to a predetermined region smaller than the outer shape of the flange 10.

The gasket shown in FIG. 6 has an annular shape having a predetermined width, and a portion (x) for connecting to the flange is located at a portion corresponding to each portion 14 to which the gasket of the flange 10 shown in FIG. 1 should be connected in the vicinity of the outer circumference 30a. It has 34) (indicated by the mark). In this example, the portions 34 are provided at three locations at equal angle intervals along the outer peripheral direction of the gasket 30, but may be provided at one location, two locations, or four or more locations.

Further, an elongated hole 36 is formed as a through hole between each portion 34 connected to the flange 10 of the gasket 30 and the region where the bead 33 is formed, and the elongated hole 36 is formed in the radial direction of the gasket 30. It extends at a predetermined angle.
The elongated holes 36 may be provided only in the vicinity of each portion 34 to be connected to the flange of the gasket 30, but in the illustrated example, the elongated holes 36 are provided at equal intervals over the entire circumference of the gasket 30. The inclination angle of the elongated hole 36 with respect to the radial direction of the gasket 30 is preferably in the range of 40 ° to 70 °, and is about 60 ° in the illustrated example.
The gasket 30 is the second embodiment of the gasket according to the present invention.

The gasket 30 shown in FIG. 6 is placed on the sealing surface 13 of the flange 10 shown in FIG. 1 in an overlapping manner, and is positioned and coupled by clinching or welding described later in the same manner as in the first embodiment described above to integrate them. As a result, the flange with gasket 2 shown in FIG. 7 can be manufactured.

When the pipes of the exhaust system of the internal combustion engine are connected by using the gasketed flange 2 of the second embodiment, it is the same as the case of using the gasketed flange 1 of the first embodiment described above. The effect is obtained.
An elongated hole 36 is provided in the vicinity of the portion 34 of the gasket 30 to be connected to the flange 10, so that the peripheral portion thereof is more easily deformed than other portions. Therefore, as described above for the first embodiment, when the gasket 30 is relatively expanded or contracted or deformed with respect to the flange 10 due to external factors such as heat or vibration of the internal combustion engine, the peripheral portion of the elongated hole 36 is formed. It can be slightly deformed to absorb the expansion and contraction and deformation so that distortion does not occur in other parts. In other words, the stress generated by the relative expansion and contraction and deformation of the gasket 30 with respect to the flange 10 can be released. Therefore, the gasket 30 is not subjected to a biased load, and the bead 33 is not damaged or deformed to impair the sealing performance.

Further, since elongated holes 36 extending at a predetermined angle with respect to the radial direction of the gasket 30 are provided at equal intervals over the entire circumference of the gasket 30, a deflecting load due to expansion and contraction of the gasket 30 is applied to the gasket 30. It can escape in the circumferential direction. Further, when the gasket 30 is connected to the sealing surface 13 of the flange 10 by spot welding, any portion between the elongated holes 36 can be formed as a portion 34 to be connected to the flange in the vicinity of the outer peripheral surface 30a of the gasket 30. The joining work can be performed efficiently.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. 8 and 9.
The flange 10 shown in FIG. 1 is also used as the flange of the third embodiment. FIG. 8 is a plan view of the gasket used in the third embodiment, and FIG. 9 is a plan view of a flange with a gasket in which the gasket is positioned and coupled to the flange shown in FIG.

The gasket 40 shown in FIG. 8 is also a gasket having the same function as the gaskets 20 and 30 in the first and second embodiments, and has an opening at the center that serves as an exhaust passage corresponding to the port hole 11 of the flange 10. A port hole 41 is formed. Further, in the peripheral portion of the port hole 41 of the gasket 40, a bead 43 for enhancing the packing effect is formed in a portion corresponding to the effective sealing region 13a of the flange 10.
The planar shape and size of the gasket 40 also include the effective sealing region 13a of the peripheral edge of the port hole 11 on the sealing surface 13 of the flange 10, and have a shape corresponding to a predetermined region smaller than the outer shape of the flange 10.

The gasket shown in FIG. 8 also has an annular shape having a predetermined width, and a portion (x) to be coupled to the flange is located at a portion corresponding to each portion 14 to which the gasket of the flange 10 shown in FIG. It has 44 (indicated by a mark). In this example, the portions 44 are provided at three locations at equal angular intervals along the outer peripheral direction of the gasket 40, but may be provided at one location, two locations, or four or more locations.

Further, a notch 46 from the outer circumference 40a is formed between each portion 44 connected to the flange 10 of the gasket 40 and the region where the bead 43 is formed, and the notch 46 is formed in the radial direction of the gasket 40. It extends at a predetermined angle.
The cutouts 46 may be provided only in the vicinity of each portion 44 to be connected to the flange of the gasket 40, but in the illustrated example, the notches 46 are provided at equal intervals over the entire circumference of the gasket 40. The inclination angle of the notch 46 with respect to the radial direction of the gasket 40 is preferably in the range of 40 ° to 70 °, and is about 60 ° in the illustrated example.
The gasket 40 is the third embodiment of the gasket according to the present invention.

The gasket 40 shown in FIG. 8 is placed on the sealing surface 13 of the flange 10 shown in FIG. 1 in an overlapping manner, and is positioned and coupled by clinch or welding described later in the same manner as in the first and second embodiments described above. By integrating, the flange with gasket 3 shown in FIG. 9 can be manufactured.
Specific examples of the joint portion between the flange 10 and the gasket 40 will be described later with reference to FIGS. 12 to 14 and 16.

Even when the pipes of the exhaust system of the internal combustion engine are connected by using the gasketed flange 3 of the third embodiment, the gasketed flanges 1 and 2 of the first and second embodiments described above are used. The same effect as the case of
A notch 46 is provided in the vicinity of the portion 44 of the gasket 40 to be connected to the flange 10, and the peripheral portion thereof is more easily deformed than other portions. Therefore, as described above for the first embodiment, when the gasket 40 expands or contracts or deforms relative to the flange 10 due to external factors such as heat or vibration of the internal combustion engine, the peripheral portion of the notch 46 is formed. It can be slightly deformed to absorb the expansion and contraction and deformation so that distortion does not occur in other parts. In other words, the stress generated by the relative expansion and contraction and deformation of the gasket 40 with respect to the flange 10 can be released. Therefore, the gasket 40 is not subjected to a biased load, and the bead 43 is not damaged or deformed to impair the sealing performance.

Further, since notches 46 extending at a predetermined angle with respect to the radial direction of the gasket 40 are provided at equal intervals over the entire circumference of the gasket 40, a deflecting load due to expansion and contraction of the gasket 40 is applied to the gasket 40. It can escape in the circumferential direction. Further, when the gasket 40 is connected to the sealing surface 13 of the flange 10 by spot welding, an arbitrary portion between the notches 46 can be a portion 44 to be coupled to the flange in the vicinity of the outer peripheral 40a of the gasket 40. The joining work can be performed efficiently.
Further, by providing the notch 46, it is possible to increase the surface area of the side surface of the gasket 40 (the surface that does not touch the flange 10 or the mating member to be connected). When the flange 10 is connected to the mating member to be connected, only the side surface of the gasket 40 is exposed to the outside. Therefore, by increasing the surface area of the side surface in this way, the heat dissipation efficiency of the gasket can be improved. it can. This also leads to prevention of deformation of the gasket 40.

[Other examples of the number of joints between gaskets and flanges]
FIG. 10 is a plan view of the flange with a gasket when the joint portion between the gasket and the flange in the second embodiment is set to one place. The gasketed flange 2'is coupled to the sealing surface 13 of the flange 10 at a portion 34 where the gasket 30 is coupled to the flange at one position.
FIG. 11 is a plan view of a flange with a gasket in the case where the joint portion between the gasket and the flange in the third embodiment of the present invention is provided at two points. The gasketed flange 3'is coupled to the sealing surface 13 of the flange 10 at a portion 44 where the gasket 40 is coupled to the two flanges.

Even if there is only one joint between the gasket and the flange, there is no problem as long as the gasket can be firmly positioned and connected to the sealing surface of the flange. Even if there is only one joint, when the bead is deformed, stress is generated between the beads 33 and 34 and the joint, so the stress is released by the elongated hole 36 or the notch 46 or the like. It makes sense.
However, the bonding is more reliable when the bonding is performed at two or more locations. In that case, it is desirable to connect the gaskets at a plurality of locations separated by a uniform angular interval in the circumferential direction as much as possible. Further, when the gaskets are connected at two or more places, stress is likely to be generated between the joint portions due to the relative expansion and contraction or deformation of the gaskets 30 and 40 with respect to the flange 10, so that the elongated holes 36 or the notch 46 or the like are used for this. The effect of releasing stress is great.
Also in the first embodiment described above, the gasket 20 is provided with a portion 24 to be connected to the flange and an extension portion 25 having a through hole 26 at one, two or four or more locations on the outer circumference of the gasket 20. It may be connected to the sealing surface 13 of the flange 10 at one place, two places, or four or more places.

[Explanation of specific examples of joints]
Here, a specific example of the joint portion between the gasket and the flange in each of the above-described embodiments will be described.
12 and 13 show an example of joining the gasket and the flange by clinching. In FIG. 13, the reference numeral of the second embodiment is used as the reference numeral on the gasket side, but in the first embodiment, the slit 37 of the gasket 30 is formed in the extending portion 25 of the gasket 20, and the third embodiment is formed. The embodiment is the same except that it is formed on the gasket 40.

FIG. 12A is an enlarged plan view of a portion where the recess 15 is provided on the sealing surface 13 of the flange 10, FIG. 12B is a cross-sectional view taken along the line AA, and FIG. 12C is a cross-sectional view taken along the line BB.
The recess 15 is a recess provided in a portion 14 (see FIG. 1) on the sealing surface 13 of the flange 10 to which the gasket should be connected. The planar shape is a rectangle having a predetermined length and width, and the gasket 30 can be connected. Has a depth of.

13A is an enlarged plan view of the joint portion between the flange and the gasket in FIG. 7, FIG. 13B is a cross-sectional view taken along the line AA, and FIG. 13C is a cross-sectional view taken along the line BB.
As shown in FIG. 13A, two parallel slits 37 are formed in the portion 34 (see FIG. 7) to be connected to the flange of the gasket 30.
Then, the gasket 30 is placed on the sealing surface 13 of the flange 10, and the portion P1 that is easily pushed and bent is sandwiched between the recess 15 shown in FIG. 12A and the two parallel slits 37 shown in FIG. 13A formed in the gasket 30. Position and place so that they match.

Then, the flange 10 on which the gasket 30 (FIGS. 13A to 13C shows only the vicinity of the portion 34 to be connected to the flange) is set in the press machine, and the punch 5 mounted on the press machine is lowered.
By the pressing force, the portion of the gasket 30 that is easily pushed and bent between the two slits 37 is pushed and bent in an inverted trapezoidal shape as shown in FIG. 13B, and the pushed and bent portion 30b is inside the recess 15 of the flange 10. To fit in. As a result, the coupling portion is formed, and the gasket 30 is positioned and coupled to the sealing surface 13 of the flange 10 to be integrated.

Since the gasket 30 has a spring property, the pushed and bent portion 30b is not easily pulled out because a force that stretches the recessed portion 15 of the flange 10 in the longitudinal direction is applied by the restoring force.
However, when the gasket 30 has deteriorated and needs to be replaced, if a strong force is applied to the gasket 30 in the direction of pulling it away from the flange 10, the bent portion 30b of the joint portion comes out of the recess 15 and the gasket 30 is removed. It can be separated from the flange 10.

In FIGS. 13B and 13C, a virtual line shows the vicinity of the tip portion in a state slightly before the punch 5 reaches the lowest lowering position in this pushing and bending step.
The width of the push-bending portion 5a of the punch 5 is slightly narrower than the width of the push-bending portion of the gasket 30. The shape of the push-bent portion 5a in the length direction shown in FIG. 13B is an inverted trapezoidal shape in which the upper end is slightly shorter than the length of the recess 15 and the lower end surface is slightly shorter than that. On the upper portion following the push-bending portion 5a, holding portions 5b are integrally provided on both sides in the length direction thereof. When the push-bend portion 5a of the punch 5 is lowered by the holding portion 5b to push and bend the easily push-bend portion between the parallel slits 37 of the gasket 30, the portion outside the both ends in the longitudinal direction of the recess 15. Has a function to prevent it from being lifted.

Further, if a protrusion for preventing the gasket 30 is formed on the side wall portion 15a of the recess 15 of the flange 10, the bent portion 30b of the gasket 30 (the portion fitted into the recess 15 of the flange 10) can be prevented from coming out of the recess 15. It can be reliably prevented.
The coupling structure by clinching is not limited to the above-mentioned example, and various structures such as providing a cross-shaped recess in the flange and forming a cross-shaped easily push-bending portion in the gasket can be adopted.

14 to 16 show an example of joining the gasket and the flange by spot welding. FIG. 14 is an enlarged cross-sectional view of the vicinity of the joint portion when the gasket according to the first embodiment is joined to the sealing surface of the flange by spot welding, and FIG. 15 is a plan view of the vicinity of the joint portion.
As shown in the drawing, a slight recess 16 is formed in a predetermined region including a portion 14 to which the gasket is to be bonded on the sealing surface 13 of the flange 10, and a portion 24 to be bonded to the flange in the extended portion 25 of the gasket 20 is formed in the recess. It is connected to the flange 10 by spot welding within 16.

The depth of the recess 16 is set so that even if the portion 24 of the gasket 20 to be connected to the flange is raised to some extent by spot welding, it does not protrude from the sealing surface 13 of the flange 10. As a result, when the flange with a gasket is joined to the connected member, there is no possibility that the adhesion between the gasket 20 and the sealing surface of the connected member is hindered.
In addition, there is no possibility that sparks (fine powder of the material of the gasket and the flange) generated during spot welding will penetrate the recess 16 and enter between the sealing surface 13 of the flange 10 and the gasket 20 to hinder the adhesion of both sides. In particular, even if sparks are emitted from the surface of the gasket 20 on the flange 10 side during welding, the sparks stay in the recess 16 due to the step at the end of the recess 16 and proceed effectively between the gasket 20 and the flange 10. It does not reach the seal region 13a.

FIG. 16 is a plan view of the vicinity of the joint portion when the gasket according to the third embodiment is joined to the sealing surface of the flange by spot welding.
Also in this case, a slight recess 16 is formed in a predetermined region including the portion 14 (see FIG. 1) to which the gasket is to be bonded on the sealing surface 13 of the flange 10, and the portion 44 to be bonded to the flange in the gasket 40 is formed in the recess 16. It is connected to the flange 10 by spot welding inside.
The depth and effect of the recess 16 in this case are the same as in the above case.
The same may be applied when the gasket 30 in the second embodiment is joined to the sealing surface 13 of the flange 10 by spot welding.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 17 to 19.
17, 18 and 19 are plan views showing a flange and a gasket used in the fourth embodiment and a flange with a gasket in which four gaskets are positioned and connected to the flange, respectively.

The flange 50 shown in FIG. 17 is a metal flange similar to the flange 10 described above, but an oval port hole 51, which is an opening serving as an exhaust passage, is spaced apart from the flange 50. Multiple (4 in this example) are formed, and they have a special shape that is long in the arrangement direction. The shape and size of each port hole 51 are the same. Then, five bolt holes 52 are provided at intervals along the outer circumference of the flange 50.
Further, in the flange 50, the portion marked with a cross outside the effective sealing region of the peripheral edge portion of each port hole 51 on the sealing surface 53 is a portion 54 to which the gasket 60 shown in FIG. 18 should be connected.

The gasket 60 shown in FIG. 18 is also a metal gasket similar to the gasket 20 described above, and has an oval ring-shaped planar shape corresponding to a predetermined region including an effective sealing region on the peripheral edge of each port hole 51 of the flange 50. I'm doing it. An oval port hole 61, which is an opening serving as an exhaust passage, is formed, and a bead 63 for improving packing performance is formed along the peripheral edge thereof.

Further, a pair of extending portions 65 extending outward are provided at symmetrical positions on the outer peripheral portion of the gasket 60 so as to include a portion 64 (indicated by a cross) to be connected to the flange. A through hole 66 is formed inside (between the region where the bead 63 is formed) in the vicinity of the portion 64 to be connected to the flange in each of the extending portions 65. The through hole 66 is an elongated hole having the same shape as the through hole 26 formed in the extending portion 25 of the gasket 20 shown in FIG.

The gasket 60 is also provided with a through hole 66 so that the peripheral portion thereof is more easily deformed than other portions. Therefore, when a flange with a gasket in which the gasket 60 is coupled to the flange 50 is used, the gasket 60 expands and contracts relative to the flange 50 due to external factors such as heat and vibration of the internal combustion engine, as in each of the above-described embodiments. Even if the deformation occurs, the peripheral portion of the through hole 36 is slightly deformed and the other portions are not distorted. That is, the stress generated by the relative expansion and contraction or deformation of the gasket 60 with respect to the flange 50 can be released, and the bead 63 is not damaged or deformed to impair the sealing performance.
The gasket 60 is a fourth embodiment of the gasket according to the present invention.

For each predetermined region around each port hole 51 on the sealing surface 53 of the flange 50 shown in FIG. 17, the gasket 60 shown in FIG. 18 is positioned so that the port hole 61 coincides with the port hole 51. It is placed as shown in FIG. Then, the portion 64 to be coupled to the flange of the extension portion 65 of each gasket 60 is coupled to the portion 54 to be coupled with the gasket on the sealing surface 53 of the flange 50. The bonding is performed by the above-mentioned crunch, spot welding, or the like.
As a result, the four gaskets 60 are positioned and coupled to the sealing surface 53 of the flange 50 and integrated to complete the flange 4 with gasket shown in FIG. The number of port holes 51 of the flange 50 is the same as the number of connecting pipes, which is four in this example, but there are various flanges having two or more (plural) port holes 51, and their shapes and shapes There are various sizes.

Even when the gasket 60 and the flange 50 are joined by spot welding in the fourth embodiment, a slight recess is formed in a predetermined region including the portion 54 to be joined on the sealing surface 53 of the flange 50, and the gasket 60 is formed. The portion 64 to be connected to the flange in the above portion may be connected to the flange 50 by spot welding in the recess.
It is preferable to provide one or more extending portions 65 having the portions 64 to be connected to the flanges of the gasket 60 and the through holes 66, preferably two or more portions separated in the circumferential direction.
Further, the gasket may be configured like the gasket 30 shown in FIG. 6 or the gasket 40 shown in FIG.

The flange 4 with a gasket is used, for example, when connecting a plurality of inlet pipes of an exhaust manifold that collects gas discharged from each cylinder of an engine into a cylinder block or a cylinder head having a plurality of exhaust holes. Will be done.
A method of connecting a plurality of pipes in an exhaust system of an internal combustion engine (engine) to which the fourth embodiment is applied will be described.

The sealing surface 53 of the flange 50, which is a common flange fixed to a plurality of pipes and in which the plurality of port holes 51 are formed at intervals, includes an effective sealing region at the peripheral edge of each port hole 51. A plurality of gaskets 60 are individually positioned and coupled in advance for each predetermined region and integrated.
The flange 50 of the gasketed flange 4 is fixed to the ends of a plurality of pipes. After that, the flange 50 and the connected member are joined with a plurality of gaskets 60 sandwiched between them.
However, when the gasket 60 and the flange 50 are joined by spot welding, it is also possible to join the plurality of gaskets 60 to the sealing surface 53 of the flange 50 after fixing the flange 50 to the ends of the plurality of pipes. .. The same applies to each of the above-described embodiments.

The connected member is a flange fixed to a connected pipe on the mating side, a cylinder head of an engine, a mounting seat of a cylinder block, or the like, and a bolt is passed through each bolt hole 52 provided in the flange 50 to pass the bolt through the mating member. Screw it into the female screw hole of the nut or the connected member and tighten it evenly to assemble.

The flange with a gasket according to the fourth embodiment and the pipe connecting method using the same also provide the same effects as those of the first to third embodiments described above, but reduce the material cost of the gasket. The effect is greater. Further, the flange for connecting such a plurality of pipes is formed in a special irregular shape according to the type of the engine and the shape in the vicinity thereof, and the gasket is manufactured individually according to the shape of the flange. No need. That is, it is sufficient to use a plurality of gaskets (common gaskets) having the same shape corresponding only to the size of the port hole, and since it can be shared with gaskets for other flanges, there is almost no need to manufacture a new gasket. ..

It should be noted that a plurality of gaskets as shown in FIG. 19 can be formed into a shape in which two gaskets are connected or a shape in which all four gaskets are connected, and the gaskets can be positioned and connected to a common flange to be integrated.
Further, when the member to be connected is a member other than the pipe such as a cylinder head or an exhaust purification device, a flange with a gasket according to the present invention is fixed to the member, and the flange is joined to the flange fixed to the pipe to connect to the pipe. You can also do it.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 20 to 22.
FIG. 20 is an explanatory diagram of an EGR system to which the present invention is applied.
As shown in FIG. 20, the EGR (Exhaust Gas Recirculation) system is a system in which a part of the exhaust gas in the internal combustion engine is lowered in temperature through the EGR cooler 75, recirculated to the intake side, and taken into the cylinder 71. As a result, while keeping the fuel injection amount small, the load on the piston 72 can be reduced, the temperature rise of the air-fuel mixture can be moderated to prevent abnormal combustion (knocking), and fuel efficiency can be improved.
In FIG. 20, 73 is an intake pipe, 73a is an intake side branch pipe, 74 is an exhaust pipe, 74a is an exhaust side branch pipe, 76 is a throttle valve, 77 is an intake valve, 78 is an exhaust valve, and 79 is an EGR valve.

In such an EGR system, in order to connect the inlet side of the EGR cooler 75 and the end portion of the exhaust side branch pipe 74a, flanges 80 fixed to each are joined with a gasket sandwiched between them, and are assembled with bolts and nuts. In order to connect the outlet side of the EGR cooler 75 and the end portion of the intake side branch pipe 73a, the flanges 80 fixed to each are joined with a gasket sandwiched between them, and are assembled with bolts and nuts.

A flange with a gasket according to the present invention can be used for one of the pair of flanges 80 to be joined, or a gasket according to the present invention can be used as a gasket sandwiched between the pair of flanges 80.
The embodiment in that case will be described with reference to FIGS. 21 and 22 as a fifth embodiment. 21 and 22 are plan views of a flange and a gasket used in the fifth embodiment of the present invention, respectively.

The flange 80 shown in FIG. 21 is a metal flange similar to the flange in each of the above-described embodiments, and has a rhombic shape in which each apex is arcuate, and an exhaust passage is provided in the center. Port hole 81 is formed. Further, bolt holes 82 for passing bolts for assembly are formed at two places on the longer diagonal line near each top.
Then, one plane shown in FIG. 21 is a seal surface 83 that faces the joint surface (also a seal surface) at the time of joining with the mating flange.
On the seal surface 83, an annular region between the inner circumference of the port hole 81 shown in FIG. 21 and the circular virtual line D, that is, the peripheral edge of the port hole 81 (opening) is the effective seal region 83a.

Then, a portion (indicated by x) 84 to be connected to the gasket is provided on the outer portion of the effective sealing region 83a on the sealing surface 83. In this example, the portions 84 are provided at two locations symmetrical with respect to the center of the port hole 81.

The gasket 90 shown in FIG. 22 has an annular planar shape, and a port hole 91 is formed at a position corresponding to the port hole 11 of the flange 80, but a bolt hole is not formed. The gasket 90 includes an effective sealing region 83a on the peripheral edge of the port hole 81 on the sealing surface 83 of the flange 80, and has a shape corresponding to a predetermined region smaller than the outer shape of the flange 80. The gasket 20 forms a bead 93 for enhancing the packing effect in a portion of the flange 80 corresponding to the effective sealing region 83a.

This gasket 90 is also manufactured by pressing a metal plate having heat resistance and springiness such as stainless steel and aluminum.
The gasket 90 is provided with two extending portions 95 so as to include a portion corresponding to each portion 84 to which the gasket of the flange 80 is to be connected. Each of the extending portions 95 protrudes outward in the radial direction from the outer circumference of the gasket 90.

A portion (indicated by x) 94 to be connected to the flange is provided near the tip of each of the extending portions 95. The portion 94 to be connected to the flange is a portion corresponding to the portion 84 to which the gasket of the flange 80 is to be connected, and is located on the outer peripheral side of the region where the bead 93 is formed.
Then, in the extended portion 95, a notch portion 96 along the outer circumference 90a is formed inside the portion 94 to be connected to the flange (the side close to the region where the bead 93 is formed). As a result, each extending portion 95 is provided with a thin portion 95a that is more easily deformed than the other portions.
The gasket 90 is the fifth embodiment of the gasket according to the present invention.

Then, the gasket 90 shown in FIG. 22 is placed on the sealing surface 83 of the flange 80 shown in FIG. 21 so that the positions of the portion 84 to be coupled to the gasket of the flange 80 and the portion 94 to be coupled to the flange of the gasket 90 are aligned. It is placed on top of each other, and both are positioned and connected to integrate them. Thereby, a flange with a gasket can be obtained.
The gasketed flange 1 can be used as one of a pair of flanges 80 to be joined on the inlet side and the outlet side of the EGR cooler 75 shown in FIG. 20, respectively.

The flange 80 and the gasket 90 can be joined by clinching or spot welding as in each of the above-described embodiments, but when applied to an EGR system, they may be joined by brazing.
Also in that case, a recess is formed in a predetermined region of the sealing surface 83 of the flange 80 including the portion 84 to which the gasket should be connected, and the portion 94 to be coupled to the flange of the gasket 90 is bonded to the flange 80 by brazing in the recess. Good. As a result, even if the thickness of the joint portion is increased by the brazing material, it is possible to prevent poor adhesion to the mating flange.

The gasket 90 is positioned on the sealing surface 83 of the flange 80 fixed to the inlet side and the outlet side of the EGR cooler 75, or on the sealing surface 83 of the flange 80 fixed to the ends of the exhaust side branch pipe 74a and the suction side branch pipe. It may be combined and integrated.
Also with this embodiment, the same effect as in the case of each of the above-described embodiments can be obtained.
Then, even if the gasket 90 expands and contracts and / or deforms relative to the flange 80, the periphery of the notch portion 96 of the gasket 90, particularly the narrowed portion 95a of the extension portion 95, expands and contracts and / or deforms. Deforms to absorb. Therefore, the gasket 90 is not subjected to a biased load, and the bead 93 is not damaged or deformed to impair the sealing performance.

The extension portion 95 provided on the gasket may be one place or three or more places. Instead of the notch 96, a through hole having a long hole similar to that of the first embodiment may be formed. Alternatively, as in the second and third embodiments, the gasket is not provided with an extension portion, and the vicinity of the outer periphery of the gasket is set as a portion to be connected to the flange, and between that portion and the region where the bead is formed, An elongated hole extending at a predetermined angle with respect to the radial direction or a notch from the outer circumference may be formed.

[Supplemental Information]
If the surface of the gasket becomes dirty or scratched during storage, transportation, or assembly work of the flange with gasket according to the present invention, the airtightness after connecting the pipes may decrease. Therefore, it is advisable to attach a protective cover so as to cover the entire surface of the completed flange with a gasket on the gasket side.
Further, only the gasket in each of the above-described embodiments can be provided as a gasket for integrating with the flange.
In each of the above-described embodiments, an example in which the material of the gasket and the flange is metal has been described, but the material is not limited to this, and the flange is made of a material having excellent strength and heat resistance, and the gasket is made of heat resistant and springy. An excellent material may be appropriately selected.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and various changes, additions, and omissions are made within the scope of the claims. Of course, it is possible to combine and combine.

1,2,2', 3,3', 4: Flange with gasket 5: Punch
10,50,80: Flange 11,51,81: Flange port hole
12, 52, 82: Bolt holes 13, 53, 83: Sealing surface
13a, 83a: Effective seal area
14, 54, 84: Part where the flange gasket should be connected 15: Recess
16: Recesses 20, 30, 40, 60, 90: Gasket
21, 31, 41, 61, 91: Gasket port holes
23, 33, 43, 63, 93: Bead
24, 34, 44, 64, 94: Parts to be connected to the flange of the gasket
25, 65, 95: Extension 26, 66: Through hole 36: Long hole (through hole)
37: Slits 46, 96: Notch 75: EGR cooler

Claims (12)

A gasketed flange with a flange and a gasket.
The flange is a flange for connecting the pipe of the exhaust system of the internal combustion engine.
The gasket is a bead-formed gasket, which is positioned and coupled to the sealing surface of the flange and integrated with the flange.
The gasket includes an effective sealing area at the peripheral edge of an opening serving as an exhaust passage on the sealing surface of the flange, is provided only in a predetermined area smaller than the outer shape of the flange, and a portion to be connected to the flange is a bead. A flange with a gasket that is on the outer peripheral side of the formed region and has a through hole or a notch formed between the portion and the region where the bead is formed. It is characterized in that the periphery of the through hole or the notch portion of the gasket is deformed so as to absorb the expansion / contraction and / or deformation according to the relative expansion / contraction and / or deformation of the gasket with respect to the flange. The flange with a gasket according to claim 1. The flange with a gasket according to claim 1 or 2 .
A plurality of the openings are formed on one flange at intervals, and the gaskets are individually formed for each predetermined region including the effective sealing region at the peripheral edge of the openings corresponding to each of the plurality of openings. A flange with a gasket characterized by being positioned and coupled. The flange with a gasket according to claim 1 or 2.
The gasket is characterized by having an extension portion extending outward from the outer periphery, having a portion to be connected to the flange in the extension portion, and forming the through hole or the notch portion inside the portion. Flange with gasket. The flange with a gasket according to claim 1 or 2.
The gasket has a portion to be connected to the flange in the vicinity of the outer periphery, and an elongated hole extending as the through hole at a predetermined angle with respect to the radial direction is formed between the portion and the region where the bead is formed. A flange with a gasket, which is characterized by being formed. The flange with a gasket according to claim 1 or 2.
The gasket has a portion to be connected to the flange in the vicinity of the outer circumference, and extends from the outer circumference as a notch portion at a predetermined angle in the radial direction between the portion and the region where the bead is formed. A flange with a gasket characterized by forming a notch. The flange with a gasket according to any one of claims 1 to 6 .
A recess is formed in a predetermined region of the sealing surface of the flange including a portion to be bonded to the gasket, and the portion of the gasket to be bonded to the flange is bonded to the flange by spot welding in the recess. Flange with gasket. A gasket that is positioned and coupled to the sealing surface of a flange for connecting the pipes of the exhaust system of an internal combustion engine.
A bead is formed in a region corresponding to the effective sealing region, including an effective sealing region of the peripheral edge of the opening serving as an exhaust passage on the sealing surface of the flange, and having a shape corresponding to a predetermined region smaller than the outer shape of the flange. And
A gasket characterized in that a portion to be bonded to the flange is on the outer peripheral side of the region where the bead is formed, and a through hole or a notch is formed between the portion and the region where the bead is formed. It is characterized in that the periphery of the through hole or the notch portion of the gasket is deformed so as to absorb the expansion and contraction and / or deformation according to the relative expansion and contraction and / or deformation of the gasket with respect to the flange. The gasket according to claim 8 . A gasket according to claim 8 or 9,
A gasket comprising an extension portion extending outward from the outer periphery, having a portion to be connected to the flange in the extension portion, and forming the through hole or the notch portion inside the portion. The gasket according to claim 8 or 9.
It has a portion to be connected to the flange in the vicinity of the outer circumference, and an elongated hole extending at a predetermined angle with respect to the radial direction is formed as the through hole between the portion and the region where the bead is formed. Characteristic gasket. The gasket according to claim 8 or 9.
A portion to be connected to the flange is provided in the vicinity of the outer circumference, and a notch portion extending from the outer circumference at a predetermined angle with respect to the radial direction is formed as the notch portion between the portion and the region where the bead is formed. A gasket characterized by the fact that it has been used.

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