JP2016166661A - Channel member uniting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a gasket by suppressing the thermal influence of a fluid.SOLUTION: When high temperature exhaust gas passes through an exhaust path 2008 of a turbo charger 20 from an exhaust path 1808 of an exhaust manifold 18 through an opening 36, the heat of exhaust gas is transmitted from an inner peripheral part of the exhaust path 1808 of the exhaust manifold 18 toward an outer periphery, and transmitted from an inner peripheral part of the exhaust path 2008 of the turbo charger 20 toward an outer periphery. A first recessed portion 2602 and a second recessed portion 2802 are positioned at places of a multi-layer gasket 30 on the inside of a first bead portion 38. A first air layer 26 formed on the first recessed portion 2602, and a second air layer 28 formed on the second recessed portion 2802 have extremely low heat conductivity as compared with metallic material configuring the exhaust manifold 18 and the turbo charger 20.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a flow path member coupling structure suitable for coupling members having flow paths, and more particularly to a flow path member coupling structure suitable for an internal combustion engine.

The exhaust gas of the internal combustion engine is discharged to the atmosphere through the flow paths of members such as an exhaust manifold, a turbocharger, and a catalyst device.
Gaskets to prevent leakage of exhaust gas flowing through the flow path are provided at the joints between the cylinder head and the exhaust manifold, the exhaust manifold and the turbocharger, the turbocharger and the catalytic device. It is installed.
The gasket includes an opening through which exhaust gas passes and a bead portion formed in an annular shape around the opening.
Then, when the two members are fastened with the gasket sandwiched between the mating surfaces of the two members, the bead portion of the gasket is compressed, and the sealing performance of the joint portion between the two members is ensured.

Japanese Patent Laid-Open No. 10-110618

However, in the above conventional structure, since the bead portion of the gasket is exposed to the high temperature of the exhaust gas in a compressed state, the bead portion is sag by long-term use (the elasticity of the bead portion is lost), There is a concern that the sealing function of the gasket deteriorates.
This invention is made | formed in view of such a situation, The objective is to provide the flow-path member coupling | bonding structure advantageous in improving the durability of a gasket by suppressing the influence of the heat | fever of a fluid. is there.

In order to achieve the above-mentioned object, the first aspect of the present invention includes a first member in which the first opening of the first flow path is formed in the first mating surface, and the second of the second flow path. And the second mating surface and the second mating surface in a state where the first opening and the second aperture are coaxially joined. A gasket sandwiched between the mating surfaces, and the gasket includes a third opening corresponding to the first opening and the second opening, and an annular shape provided around the third opening. The first bead portion is provided, and a concave portion is provided on the inner surface of the first bead portion on the mating surface of at least one of the first member and the second member. .
According to a second aspect of the present invention, the concave portion extends annularly around the first opening and the second opening, and the first member and the second member are opposed to each other. It is provided in both sides.
The invention according to claim 3 is characterized in that the gasket includes a second bead portion at a position inside the recess.
The invention according to claim 4 is characterized in that the gasket is a multilayer gasket composed of two or more seal plates, and the first bead portion is provided in the opposite direction for each seal plate. And

According to the first aspect of the present invention, since the heat transfer from the first member or the second member to the first bead portion can be suppressed by the recess, the first bead portion is compressed. Therefore, exposure to fluid heat can be suppressed, which is advantageous in increasing the durability of the gasket.
According to invention of Claim 2, since the heat | fever transmitted to a 1st bead part can be more reliably suppressed by the recessed part provided in both the 1st member and the 2nd member, on improving durability of a gasket. More advantageous.
According to the third aspect of the present invention, the fluid is less likely to enter the recess by the second bead, which is more advantageous in suppressing the heat of the fluid from being transmitted to the first bead portion.
According to the invention of claim 4, it is more advantageous in securing the heat resistance and durability of the gasket.

1 is a configuration diagram of an internal combustion engine to which a flow path member coupling structure of the present embodiment is applied. It is A arrow directional view of FIG. It is a top view of the gasket which comprises the flow-path member coupling | bonding structure of this Embodiment. It is sectional drawing which shows the structure of the flow-path member coupling | bonding structure of this Embodiment, and shows the state before a gasket is assembled | attached between the mating surface of an exhaust manifold, and the mating surface of a turbocharger. It is sectional drawing which shows the structure of the flow-path member coupling | bonding structure of this Embodiment, and shows the state after the gasket was assembled | attached between the mating surface of an exhaust manifold, and the mating surface of a turbocharger.

Next, an exhaust system of an internal combustion engine to which the flow path member coupling structure of the present embodiment is applied will be described with reference to FIGS.
The internal combustion engine 10 includes an engine body 12, and the engine body 12 includes a cylinder head 14 and a cylinder block 16.
A combustion chamber is formed in the cylinder head 14, and a plurality of cylinders (cylinder chambers) that accommodate pistons are formed in the cylinder block 16. In the present embodiment, four cylinders are formed.

The exhaust system of the internal combustion engine 10 from which exhaust gas is discharged includes an exhaust manifold 18, a turbocharger 20 (supercharger), a first catalyst device 22, and a second catalyst device 24. Yes.
The cylinder head 14 has an exhaust port for exhausting the exhaust gas from the combustion chamber, and the exhaust manifold 18, the turbocharger 20, the first catalyst device 22, and the second catalyst device 24 each have an exhaust passage through which the exhaust passes. The flow path coupling structure of the present invention includes a coupling portion between the cylinder head 14 and the exhaust manifold 18, a coupling portion between the exhaust manifold 18 and the turbocharger 20, a coupling portion between the turbocharger 20 and the first catalyst device 22, The present invention can be applied to a joint portion between the first catalyst device 22 and the second catalyst device 24.

In the following, description will be made by taking as an example a connecting portion between the exhaust manifold 18 and the turbocharger 20.
As shown in FIGS. 1 and 5, the exhaust manifold 18 includes an inlet side flange 1802, an outlet side flange 1804, and a pipe body 1806 that connects the flanges 1802 and 1804, and an exhaust passage 1808 is provided therein. Is formed.
The inlet side flange 1802 is coupled to the cylinder head 14, and the outlet side flange 1804 has a mating surface 1810 coupled to the mating surface 2010 of the turbocharger 20, and an opening 1812 of the exhaust passage 1808 is formed in the mating surface 1810. ing.

The turbocharger 20 rotates the compressor by the energy of the exhaust gas, rotates the compressor, compresses the intake air in the intake pipe, and supplies it to the engine body 12 as high-pressure intake air.
The turbocharger 20 includes an inlet-side flange 2002 coupled to the outlet-side flange 1804 of the exhaust manifold 18, an outlet-side flange 2004 coupled to the first catalyst device 22, and a case 2006 that houses a turbine and a compressor. An exhaust passage 2008 is formed in the interior of these.
The inlet side flange 2002 has a mating surface 2010 coupled to the mating surface 1810 of the exhaust manifold 18, and an opening 2012 of an exhaust passage 2008 is formed in the mating surface 2010.

As shown in FIG. 4, a first concave portion 2602 that extends in an annular shape is provided on the mating surface 1810 of the exhaust manifold 18 at a location radially outside the opening 1812 on the mating surface 1810 of the exhaust manifold 18. Yes.
A second concave portion 2802 that extends in an annular shape on the mating surface 2010 of the turbocharger 20 is provided at a location radially outside the opening 2012 on the mating surface 2010 of the turbocharger 20.
In the present embodiment, the first recess 2602 extends annularly around the opening 1812 of the exhaust passage 1808 of the exhaust manifold 18, and the second recess 2802 is formed in the opening 2012 of the exhaust passage 2008 of the turbocharger 20. The ring extends around the periphery. The first and second recesses 2602 and 2802 may be circumferential or polygonal when viewed in plan.
In the present embodiment, the first and second recesses 2602 and 2802 are formed with the same contour when viewed from the axial direction of the openings 1812 and 2012. The first and second recesses 2602 and 2802 may be formed with the same width and the same depth. By forming the recesses 2602 and 2802 in the same shape as described above, it is possible to uniformly suppress the heat transmitted to the gasket 30, which is more advantageous in increasing the durability of the gasket 30.

As shown in FIG. 5, the gasket 30 is interposed between the mating surface 1810 of the exhaust manifold 18 and the mating surface 2010 of the inlet-side flange 2002 of the turbocharger 20, and bolts and nuts inserted through the bolt insertion holes 32. Both flanges 1802 and 2002 are fastened.
By fastening both flanges 1802 and 2002 in this way, the first recess 2602 is closed by the gasket 30 to become the first air layer 26, and the second recess 2802 is closed by the gasket 30 and the second Air layer 28.
The gasket 30 is made of a metal material, and various conventionally known metal materials such as stainless steel can be used as the metal material.

As shown in the plan view of FIG. 3 and the cross-sectional view of FIG.
Each seal plate 34 includes a gasket opening 36, a first bead portion 38, a second bead portion 40, a first flat portion 42, and a second flat portion 44.
The two seal plates 34 have the same shape and the same size, and the outer edges of the two seal plates 34 are formed with the same shape as the mating surface 1810 of the exhaust manifold 18 and the mating surface 2010 of the turbocharger 20. .

The gasket opening 36 corresponds to the opening 1812 of the exhaust passage 1808 of the exhaust manifold 18 and the opening 2012 of the exhaust passage 2008 of the turbocharger 20, and is formed with the same contour as those openings 1812 and 2012.
The gasket opening 36 is arranged coaxially with the openings 1812 and 2012 of the exhaust passages 1808 and 2008 when the outlet-side flange 1804 of the exhaust manifold 18 and the inlet-side flange 2002 of the turbocharger 20 are fastened.

The first bead portion 38 is annularly extended around the gasket opening 36 at a location outside the first recess 2602 and the second recess 2802.
In the present embodiment, as shown in FIG. 4, the first bead portion 38 is bent in the opposite direction in the thickness direction of the seal plate 34 for each seal plate 34.
The 1st bead part 38 is a full bead, and the cross-sectional shape is exhibiting the mountain shape.
As shown in FIG. 5, the first bead portion 38 is elastically deformed in a state where the first gasket 30 is sandwiched between the mating surface 1810 of the exhaust manifold 18 and the mating surface 2010 of the turbocharger 20, and the exhaust manifold 18. The opening 1812 of the exhaust passage 1808 and the opening 2012 of the exhaust passage 2008 of the turbocharger 20 communicate with each other through the gasket opening 36 in an airtight manner.

The second bead portion 40 extends annularly along the edge of the gasket opening 36.
In the present embodiment, the second bead portion 40 is bent in the opposite direction in the thickness direction of the seal plate 34 for each seal plate 34.
As shown in FIG. 4, the second bead portion 40 is a half bead and has an inclined surface whose height gradually increases as the cross-sectional shape approaches the gasket opening 36.
As shown in FIG. 5, the second bead portion 40 is elastically deformed in a state where the first gasket 30 is sandwiched between the mating surface 1810 of the exhaust manifold 18 and the mating surface 2010 of the turbocharger 20, and the exhaust manifold 18. The first air layer 26 is closed with respect to the opening 1812 of the exhaust passage 1808, and the second air layer 28 is closed with respect to the opening 2012 of the exhaust passage 2008 of the turbocharger 20.

In the present embodiment, the exhaust manifold 18 corresponds to the first member, and the turbocharger 20 corresponds to the second member.
Further, the exhaust path 1808 of the exhaust manifold 18 corresponds to a first flow path, and the exhaust path 2008 of the turbocharger 20 corresponds to a second flow path.
Further, the opening 1812 of the exhaust manifold 18 corresponds to a first opening, and the opening 2012 of the turbocharger 20 corresponds to a second opening.
Further, the gasket opening 36 corresponds to a third opening.
The mating surface 1810 of the exhaust manifold 18 corresponds to the first mating surface, and the mating surface 2010 of the turbocharger 20 corresponds to the second mating surface.

Next, the function and effect will be described.
When hot exhaust gas passes from the exhaust passage 1808 of the exhaust manifold 18 through the gasket opening 36 to the exhaust passage 2008 of the turbocharger 20, the heat of the exhaust gas is changed from the inner peripheral portion of the exhaust passage 1808 of the exhaust manifold 18 to the outer periphery. Conduction toward the outer periphery from the inner peripheral portion of the exhaust passage 2008 of the turbocharger 20 toward the outer periphery and from the inner peripheral portion of the gasket opening 36 of the gasket 30 toward the outer periphery.
At this time, the first air layer 26 and the second air layer 28 erected from the location of the gasket 30 are located at the location of the multilayer gasket 30 inside the first bead portion 38.
The first air layer 26 has an extremely low thermal conductivity as compared with the metal material that constitutes the exhaust manifold 18, and the second air layer 28 has a heat conductivity that is greater than that of the metal material that constitutes the turbocharger 20. Very low conductivity.
Therefore, the heat transfer from the exhaust manifold 18 and the turbocharger 20 to the first bead portion 38 can be suppressed by the first air layer 26 and the second air layer 28.
As a result, exposure of the first bead portion 38 to a high temperature of the exhaust gas in a compressed state can be suppressed, which is advantageous in enhancing the durability of the gasket 30.

As shown in FIG. 1, the first and second catalytic devices 22 and 24 are arranged downstream of the exhaust gas flow with respect to the coupling portion between the exhaust manifold 18 and the turbocharger 20. The first and second catalyst devices 22 and 24 purify exhaust gas discharged from the internal combustion engine 10 and include a catalyst such as a three-way catalyst. By this oxidation or reduction action by the catalyst, harmful substances in the exhaust gas are rendered harmless and released to the atmosphere.
Here, the catalyst generally has a characteristic that the exhaust gas cannot be sufficiently purified below a predetermined activation temperature, and it is necessary to quickly raise the catalyst to the activation temperature when the internal combustion engine 10 is cold-started. There is.
In the present embodiment, since the heat of the exhaust gas is insulated by the first and second air layers 26, 28, the heat of the exhaust gas is difficult to be transmitted to the exhaust manifold 18 and the turbocharger 20, and accordingly, the exhaust gas heat This is advantageous in suppressing the temperature drop.
Accordingly, since the temperature of the exhaust gas can be promoted during the cold start of the internal combustion engine 10, the catalysts of the first and second catalyst devices 22 and 24 can be quickly raised to the activation temperature. This is advantageous in securing the exhaust gas purification function of the first and second catalyst devices 22 and 24.

In the present embodiment, the exhaust manifold 18 is provided with a first recess 2602 and the turbocharger 20 is provided with a second recess 2802. The first recess 2602 and the second recess 2802 are provided with a first air. Although the case where the layer 26 and the second air layer 28 are formed has been described, even if at least one of the first concave portion 2602 and the second concave portion 2802 is provided, the same effect can be obtained.
However, if both the first concave portion 2602 and the second concave portion 2802 are provided as in the present embodiment, the heat transmitted to the first bead portion 38 can be more reliably suppressed, so that the durability of the gasket 30 is improved. Further, it is more advantageous in suppressing the temperature drop of the exhaust gas.
In the present embodiment, the case where the first air layer 26 and the second air layer 28 are formed in the first concave portion 2602 and the second concave portion 2802 has been described. Even if the first recess 2602 and the second recess 2802 are filled with a heat insulating material instead of the second air layer 28, the same effect can be obtained.

Further, in the present embodiment, the gasket 30 includes the second bead portion 40 at a position inside the first concave portion 2602 and the second concave portion 2802, so that the exhaust gas is in the first concave portion 2602 and the second concave portion 2802. The second recess 2802 (first and second air layers 26, 28) is less likely to enter, which is more advantageous in suppressing the heat of the exhaust gas from being transmitted to the first bead portion 38.
The second bead portion 40 may be a full bead. However, as in the present embodiment, when the second bead portion 40 is a half bead, the second bead portion 40 is a full bead compared to the case where the second bead portion 40 is a full bead. The space occupied by the two bead portions 40 is small, and the gasket 30 can be made compact.
Therefore, the mating surface 1810 of the outlet side flange 1804 of the exhaust manifold 18 and the mating surface 2010 of the inlet side flange 2002 of the turbocharger 20 can be made compact. As a result, the exhaust manifold 18 and the turbocharger 20 can be made compact and lightweight. It is also advantageous in planning.

  Further, the gasket 30 may be configured by a single seal plate 34. However, as in the present embodiment, the gasket 30 is a multilayer gasket configured by two seal plates 34. If one bead portion 38 is provided in the opposite direction for each seal plate 34, it is more advantageous in securing the heat resistance and durability of the gasket 30.

In the present embodiment, the case where the present invention is applied to the coupling portion between the exhaust manifold 18 and the turbocharger 20 has been described. However, the coupling portion between the cylinder head 14 and the exhaust manifold 18, the turbocharger 20 and the first charger. The present invention can be similarly applied to a joint portion between the catalyst device 22 and a joint portion between the first catalyst device 22 and the second catalyst device 24.
In the present embodiment, the case where the present invention is applied to the exhaust system of the internal combustion engine 10 has been described. However, the application target of the present invention is not limited to the internal combustion engine 10, and various conventionally known fluids can be used. The present invention can be widely applied to flow channel member coupling structures that circulate.

18 Exhaust manifold (first member)
1808 Exhaust channel (first channel)
1810 mating surface (first mating surface)
1812 opening (first opening)
20 Turbocharger (second member)
2008 Exhaust channel (second channel)
2010 mating surface (second mating surface)
2012 opening (second opening)
26 First air layer 28 Second air layer 30 Gasket 34 Seal plate 36 Gasket opening (third opening)
38 1st bead part 40 2nd bead part

Claims (4)

A first member in which a first opening of the first flow path is formed in the first mating surface;
A second member in which a second opening of the second channel is formed in the second mating surface;
A gasket sandwiched between the first mating surface and the second mating surface in a state where the first opening and the second opening are coaxially coupled,
The gasket has a third opening corresponding to the first opening and the second opening, and an annular first bead portion provided around the third opening,
A recess is provided on the inner surface of the first bead portion on at least one mating surface of the first member and the second member.
A flow path member coupling structure characterized by the above. The recess extends annularly around the first opening and the second opening, and is provided on both the first member and the second member so as to face each other.
The flow path member coupling structure according to claim 1. The gasket includes a second bead portion at a location inside the recess.
The flow path member coupling structure according to claim 1 or 2, wherein The gasket is a multilayer gasket composed of two or more seal plates,
The first bead portion is provided in the opposite direction for each seal plate,
The flow path member coupling structure according to any one of claims 1 to 3, wherein

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