JP2011236849A - Exhaust cooling system of internal combustion engine and exhaust cooling adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust cooling system of an internal combustion engine and an exhaust cooling adapter which prevent an increase in size and weight of the internal combustion engine.SOLUTION: In the exhaust cooling adapter 2, an exhaust flow passage 22 for cooling exhaust immediately after the exhaust is discharged from an exhaust port 8a on a cylinder head 8 side is formed. In addition to the exhaust flow passage 22, an exhaust supply passage 30a for EGR is separately formed as a fluid cooling flow passage. By using the exhaust supply passage 30a for EGR, the exhaust for EGR can be cooled as an EGR cooler 30 when re-circulating the exhaust after passing through the exhaust flow passage 22 of the exhaust cooling adapter 2 to an exhaust re-circulation device. Since both of prevention of thermal damage to the exhaust system and cooling of the EGR exhaust can be performed, an EGR cooler need not be formed on the cylinder head 8 or other part, or a compact EGR cooler is sufficient even if it is provided, resulting in prevention of the increase in the size or weight of the internal combustion engine 4.

Description

  The present invention relates to a system for cooling exhaust gas discharged from an internal combustion engine and an adapter disposed between an exhaust port and an exhaust manifold for exhaust cooling.

A technique for cooling exhaust gas in order to prevent heat damage in an exhaust system of an internal combustion engine, particularly heat damage of an exhaust purification catalyst is known (see, for example, Patent Document 1).
In an exhaust gas recirculation device (EGR) that recirculates exhaust gas to the intake side, a mechanism for cooling the exhaust gas that is recirculated in order to prevent thermal damage in the exhaust gas recirculation device or the intake system is known (for example, Patent Literature 2 and 3).

  In the exhaust system cooling device of Patent Document 1, the exhaust discharged from the exhaust port of the internal combustion engine to the exhaust cooling adapter is immediately cooled by the cooling water flowing through the cooling water passage formed in the wall, and then the exhaust manifold To the side.

  In Patent Documents 2 and 3, the exhaust gas is immediately introduced into the EGR passage formed in the cylinder head from the exhaust port, cooled by a water jacket in the cylinder head, and then recirculated.

Japanese Utility Model Publication No. 64-15718 (pages 1 to 13, FIGS. 2 to 5) JP 2008-45499 A (6th and 7th pages, FIGS. 1 and 2) JP 2002-106420 A (pages 5-9, FIGS. 1-3, 9)

  Therefore, when trying to carry out both the prevention of heat damage in the exhaust system and the cooling of the fluid such as the exhaust for EGR, separately from the exhaust cooling adapter arranged as described above, the EGR is used on the cylinder head side and other parts. As a result, a cooling mechanism such as exhaust gas is formed, which may increase the size and weight of the internal combustion engine as a whole.

  An object of the present invention is to provide an internal combustion engine exhaust cooling system and an exhaust cooling adapter that can prevent an increase in size and weight of the internal combustion engine.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
The exhaust cooling system of the internal combustion engine according to claim 1 is characterized in that an EGR cooler is disposed between an exhaust port opened in a cylinder head of the internal combustion engine and an exhaust manifold.

  Since the EGR cooler is arranged between the exhaust port and the exhaust manifold as described above, a part of the conventional exhaust path can be used as a space for the EGR cooler without arranging the EGR cooler at another position. Can be used as Alternatively, even if there is an EGR cooler arranged at another position, the function of the EGR cooler between the exhaust port and the exhaust manifold may be complemented, and the size can be reduced.

Moreover, this arrangement of the EGR cooler makes it possible to use the EGR cooler also for preventing heat damage in the exhaust system.
For this reason, the internal combustion engine as a whole is saved in space, and an increase in size and weight of the internal combustion engine can be prevented.

  The internal combustion engine exhaust cooling system according to claim 2 is the internal combustion engine exhaust cooling system according to claim 1, wherein the EGR cooler has an exhaust passage disposed between the exhaust port and the exhaust manifold. It also serves as an exhaust cooling adapter that cools the exhaust flowing through the exhaust flow path by flowing cooling water through a cooling water flow path formed in a wall surrounding the exhaust flow path.

Thus, the EGR cooler also serves as an exhaust cooling adapter that prevents heat damage in the exhaust system, thereby improving the space saving effect.
The internal combustion engine exhaust cooling system according to claim 3, wherein the EGR cooler is provided for EGR in the wall separately from the exhaust flow path and the cooling water flow path. The exhaust cooling flow path is formed.

As described above, as the exhaust cooling adapter / EGR cooler, an exhaust cooling flow path for EGR may be separately formed in the wall.
In this way, the member disposed between the exhaust port and the exhaust manifold can perform both heat damage prevention in the exhaust system and exhaust cooling for EGR, so that the exhaust cooling flow can be applied to the cylinder head side and other parts. Since it is not necessary to form a path, or even if it is provided, it is possible to reduce the size of the internal combustion engine.

  The internal combustion engine exhaust cooling system according to claim 4 is the internal combustion engine exhaust cooling system according to claim 3, wherein the cooling water flow path is disposed between the exhaust cooling flow path and the exhaust flow path. It is characterized by that.

  When the exhaust cooling channel for EGR is formed separately from the exhaust channel and the cooling water channel, the cooling water channel is arranged between the exhaust cooling channel and the exhaust channel. The heat from the exhaust passage can be prevented from being transmitted to the exhaust in the exhaust cooling passage. Therefore, the cooling effect on the exhaust gas for EGR is improved.

  An internal combustion engine exhaust cooling system according to claim 5 is the internal combustion engine exhaust cooling system according to claim 3 or 4, wherein the exhaust once introduced from the exhaust passage is introduced into the exhaust cooling passage. It has a route.

The exhaust introduction path introduces the exhaust cooled and discharged in the exhaust passage into the exhaust cooling passage and cools it again. As a result, the exhaust gas for EGR can be effectively cooled.
In the internal combustion engine exhaust cooling system according to claim 6, in the internal combustion engine exhaust cooling system according to claim 5, the exhaust introduction path includes exhaust from the downstream of the exhaust manifold portion of the exhaust manifold to the exhaust cooling flow path. It is characterized by being introduced.

  By introducing exhaust into the exhaust cooling channel from the exhaust manifold downstream of the exhaust manifold, the exhaust that has been mixed for all cylinders, made uniform in terms of components, and suppressed and uniformed in temperature is also sent to the exhaust cooling channel. Can be cooled.

This makes it possible to supply more appropriate exhaust gas to the EGR side, both in terms of components and temperature.
The internal combustion engine exhaust cooling system according to claim 7, wherein the exhaust introduction path is configured to cool exhaust from the downstream side of an exhaust purification catalyst attached to the exhaust manifold. It is introduced into the flow path.

  In this way, by introducing the exhaust gas from the downstream side of the exhaust purification catalyst into the exhaust cooling channel, the exhaust gas after the deposits and the like in the exhaust gas are filtered can be introduced into the exhaust cooling channel. Thus, deposits can be prevented from accumulating in the exhaust cooling channel and the EGR.

  The exhaust cooling adapter according to claim 8 is disposed between the exhaust port that opens to the cylinder head of the internal combustion engine and the exhaust manifold, and allows cooling water to flow through a cooling water passage formed in a wall surrounding the exhaust passage. Thus, an exhaust cooling adapter for cooling the exhaust flowing through the exhaust flow path, wherein a fluid cooling passage is formed in the wall separately from the exhaust flow path.

  In this way, the exhaust cooling adapter is formed with a fluid cooling passage separately from the exhaust passage, so that after disposing the exhaust cooling port between the exhaust port and the exhaust manifold, various fluids are fluidized in the fluid cooling passage. By flowing through the cooling passage, it can also serve as a cooling unit for various fluids.

  Thus, the exhaust cooling adapter can perform both heat damage prevention in the exhaust system and cooling of other fluids. As a result, it is not necessary to form a fluid cooling part on the cylinder head side or other parts in the internal combustion engine, or even if it is provided, the cooling part may be small so that the internal combustion engine is prevented from becoming large and heavy. it can.

  The exhaust cooling adapter according to claim 9 is the exhaust cooling adapter according to claim 8, wherein the fluid cooling passage is an EGR cooler that cools the exhaust gas for EGR.

  As described above, an EGR cooler can be used as the fluid cooling passage, and the EGR exhaust can be cooled without forming the EGR cooler on the cylinder head side or other portions. Alternatively, even when a separate EGR cooler is provided on the cylinder head side or other portions, the EGR exhaust can be sufficiently cooled even if it is small.

  The exhaust cooling adapter according to claim 10 is the exhaust cooling adapter according to claim 8, wherein the fluid cooling passage is an oil cooler for cooling engine oil.

  As described above, an oil cooler can be used as the fluid cooling passage, and engine oil can be cooled without forming an oil cooler on the cylinder head side or other portions. Alternatively, even when a separate oil cooler is provided on the cylinder head side or other parts, the engine oil can be sufficiently cooled even with a small size.

1 is a configuration explanatory diagram of an internal combustion engine exhaust cooling system according to Embodiment 1. FIG. (A)-(d) Structure explanatory drawing of the adapter for exhaust cooling of Embodiment 1. FIG. (A)-(c) Structure explanatory drawing of the adapter for exhaust cooling of Embodiment 1. FIG. (A), (b) The structure explanatory drawing which fractures | ruptures and shows the adapter for exhaust cooling of Embodiment 1. FIG. FIG. 3 is an explanatory diagram of an arrangement state of a water jacket and an EGR exhaust supply path in the exhaust cooling adapter of the first embodiment. The perspective view which shows the space shape of the water jacket of Embodiment 1, and the exhaust_gas | exhaustion supply path for EGR. FIG. 4 is a configuration explanatory diagram of an internal combustion engine exhaust cooling system of a second embodiment. (A)-(d) Structure explanatory drawing of the adapter for exhaust cooling of Embodiment 2. FIG. (A)-(c) Structure explanatory drawing of the adapter for exhaust cooling of Embodiment 2. FIG. FIG. 5 is a perspective view showing the exhaust cooling adapter according to the second embodiment by cutting vertically. FIG. 6 is a longitudinal sectional view of an exhaust cooling adapter according to a second embodiment.

[Embodiment 1]
FIG. 1 shows a configuration in which an exhaust cooling adapter 2 to which the above-described invention is applied is incorporated in an exhaust system of an internal combustion engine 4. The internal combustion engine 4 is a V-type 6-cylinder gasoline engine mounted on a vehicle and includes two banks. FIG. 1 shows an internal combustion engine exhaust cooling system 6 on one bank side. Basically, both banks are configured as shown in FIG.

  Intake into the combustion chamber 4b of each cylinder 4a of the bank is introduced as an air-fuel mixture together with fuel from the intake system through the intake port and the intake valve in the intake stroke. This air-fuel mixture is compressed by the piston in the compression stroke, and ignited by the spark plug in the combustion stroke and burns. Then, when the exhaust valve 4c is opened in the exhaust stroke, the gas in the combustion chamber 4b is exhausted to the exhaust system as exhaust.

  Here, the exhaust system includes an exhaust port 8a formed in the cylinder head 8, an exhaust cooling adapter 2 connected to the cylinder head 8 at the opening position of the exhaust port 8a, and an exhaust manifold connected to the exhaust cooling adapter 2. 10 is provided. Further, on the downstream side of the exhaust manifold 10 a of the exhaust manifold 10, a catalytic converter 12 that houses an exhaust purification catalyst is provided.

  The configuration of the exhaust cooling adapter 2 is shown in FIGS. 2A is a perspective view seen from the exhaust side, FIG. 2B is a front view, FIG. 2C is a left side view, FIG. 2D is a right side view, and FIG. 3A is a plan view. (B) is a bottom view, (c) is a rear view, (a) in FIG. 4 is a horizontal sectional view taken along line XX shown in (b) of FIG. 2, and (b) is a perspective view in a broken state thereof. It is.

  The exhaust cooling adapter 2 is disposed between the exhaust port 8a that opens to the cylinder head 8 and the exhaust manifold 10 as shown in FIG. 1, and cools the exhaust discharged from the exhaust port 8a to the exhaust manifold 10 side. This is to prevent heat damage in the exhaust system of the internal combustion engine.

  Such an exhaust cooling adapter 2 is made of, for example, a metal material such as an aluminum alloy or an iron alloy, and forms a cylinder head side connection surface 16 in which an exhaust introduction port 14 opens on the exhaust upstream side. . Three exhaust inlets 14 are arranged in a straight line corresponding to the position and number of exhaust ports 8 a in the cylinder head 8.

  On the exhaust downstream side, an exhaust manifold side connection surface 20 is formed in which the exhaust discharge port 18 opens. Three exhaust discharge ports 18 are arranged in a straight line corresponding to the exhaust introduction port 14.

The exhaust inlet 14 and the exhaust outlet 18 are connected by three exhaust passages 22 formed in the exhaust cooling adapter 2.
In the exhaust cooling adapter 2, a bolt fastening portion 16 a for fastening the exhaust cooling adapter 2 itself to the adapter connection surface 8 b on the cylinder head 8 side is formed around the cylinder head side connection surface 16. . The bolt B1 is inserted into the bolt insertion hole 16b formed in the bolt fastening portion 16a, and is screwed into the screwing hole opened in the adapter connection surface 8b on the cylinder head 8 side. The adapter 2 is fixed to the cylinder head 8 by bolt fastening. Thus, the exhaust port 8a on the cylinder head 8 side and the exhaust flow path 22 on the exhaust cooling adapter 2 side can be connected.

  Further, the exhaust cooling adapter 2 is formed with a bolt fastening portion 20 a for fastening the exhaust manifold 10 with bolts around the exhaust manifold side connection surface 20. A screwing hole 20b is formed in the bolt fastening portion 20a, and the bolt B2 is screwed through an insertion hole formed in the flange 10b on the exhaust manifold 10 side, whereby the exhaust manifold 10 is bolted. Connected. Thus, the exhaust passage 22 on the exhaust cooling adapter 2 side and the exhaust passage 10c on the exhaust manifold 10 side can be connected.

A water jacket 24 is formed around the exhaust flow path 22 in the wall of the exhaust cooling adapter 2 attached to the internal combustion engine 4 in this way.
The water jacket 24 in the exhaust cooling adapter 2 is shown by a broken line in the front view of FIG. In FIG. 6, the space shape of the water jacket 24 is shown by a broken perspective view. In FIG. 6, the exhaust flow path 22 and an EGR cooler 30 described later are indicated by solid lines.

The exhaust cooling adapter 2 is provided with a cooling water introduction part 26 on the lower side and a cooling water discharge part 28 on the upper side for supplying and discharging cooling water to and from the water jacket 24.
Cooling water is introduced into the water jacket 24 from a cooling water inlet 26 a formed in the cooling water inlet 26. The introduced cooling water flows through the water jacket 24 as indicated by an arrow (solid line) in FIG. 5, and then externally cooled through a cooling water discharge port 28 a formed in the cooling water discharge portion 28. It is discharged to the water reflux path.

  As a result, the amount of heat of the high-temperature exhaust flowing through the exhaust flow path 22 as indicated by the arrow line (dashed line) is changed by the cooling water flowing through the cooling water flow paths 24a, 24b, 24c, 24d, 24e, and 24f of the water jacket 24. Can absorb. The exhaust gas thus cooled is sent to the exhaust manifold 10 side.

  Further, an EGR cooler 30 is formed at one end of the exhaust cooling adapter 2, here at the end close to the cooling water discharge portion 28. The EGR cooler 30 forms an EGR exhaust supply path 30 a (recirculation exhaust supply path) in the wall of the exhaust cooling adapter 2. Thus, the cooling water flowing in the water jacket 24 (here, the cooling water flow path 24f) as indicated by the arrow (solid line) cools the exhaust gas flowing in the EGR exhaust supply path 30a as indicated by the arrow (broken line). And it supplies to the EGR valve side.

  Exhaust gas is introduced into the EGR exhaust supply passage 30a from the downstream side of the catalytic converter 12 through the introduction pipe 30b in the exhaust system. The introduction pipe 30b is connected to an EGR introduction hole 10d portion opened in the flange 10b on the exhaust manifold 10 side, and introduces high-temperature exhaust gas into the EGR exhaust supply path 30a through the EGR introduction hole 10d.

  Then, as indicated by an arrow (broken line), the EGR exhaust gas that has flowed through the EGR exhaust supply passage 30a and is cooled is supplied from the outlet portion 30c to the EGR valve side, and is supplied from the EGR valve into the intake air.

The EGR exhaust supply passage 30 a is not adjacent to the exhaust passage 22 because the cooling water passage 24 f of the water jacket 24 is disposed between the EGR exhaust supply passage 30 a and the exhaust passage 22.
According to the first embodiment described above, the following effects can be obtained.

  (1) The exhaust cooling adapter 2 is provided with an exhaust flow path 22 for cooling the exhaust immediately after being discharged from the exhaust port 8a on the cylinder head 8 side. Further, in addition to the exhaust passage 22, an EGR exhaust supply passage 30 a is formed as an exhaust cooling passage separately from the exhaust passage 22. The EGR exhaust supply passage 30a is used to cool the EGR exhaust as the EGR cooler 30 when the exhaust gas after exiting the exhaust passage 22 of the exhaust cooling adapter 2 is recirculated to the exhaust gas recirculation device. can do. That is, the EGR cooler 30 is arranged between the exhaust port 8a and the exhaust manifold 10.

  As described above, the exhaust cooling adapter 2 can perform both heat damage prevention in the exhaust system and EGR exhaust cooling, so that it is not necessary to provide an EGR cooler in the cylinder head 8 or other parts, or provided. In this case, the internal combustion engine 4 can be prevented from being increased in size and weight.

  (2) In particular, since the water jacket 24 is disposed between the EGR exhaust supply path 30a and the exhaust flow path 22, the heat from the exhaust flow path 22 is generated in the EGR exhaust supply path 30a. Transmission to the EGR exhaust can be suppressed. Therefore, the fluid cooling effect can be sufficiently enhanced.

  (3) In particular, by introducing the EGR exhaust gas from the downstream of the catalytic converter 12 to the EGR exhaust gas supply passage 30a, the exhaust gas after the deposits and the like in the exhaust gas are filtered can be introduced into the EGR exhaust gas supply passage 30a. . Thus, deposits can be prevented from accumulating in the EGR exhaust supply passage 30a and the exhaust gas recirculation device.

[Embodiment 2]
The configuration of the exhaust cooling adapter 102 and the internal combustion engine exhaust cooling system 106 according to the present embodiment is shown in FIG. The internal combustion engine 104 has the same configuration as that of the first embodiment.

  The configuration of the exhaust cooling adapter 102 is shown in FIGS. 8A is a perspective view seen from the exhaust discharge side, FIG. 8B is a front view, FIG. 8C is a left side view, FIG. 8D is a right side view, and FIG. b) is a plan view, FIG. 10C is a bottom view, FIG. 10 is a perspective view taken along line YY in FIG. 9B, and FIG. 11 is a cross-sectional view along line YY.

  As in the first embodiment, the exhaust cooling adapter 102 is disposed between the exhaust port 108a that opens to the cylinder head 108 and the exhaust manifold 110 in order to prevent thermal damage in the exhaust system, and the exhaust port 108a. The exhaust discharged from the engine is cooled and discharged to the exhaust manifold 110 side.

  The internal configuration of the exhaust cooling adapter 102 is basically the same as that of the first embodiment except for the portion of the EGR cooler 130. That is, the exhaust cooling adapter 102 is cast from a metal material, and on the upstream side of the exhaust, a cylinder head side connection surface 116 in which three exhaust introduction ports 114 arranged in a straight line are opened, Correspondingly, an exhaust manifold side connection surface 120 with an exhaust exhaust port 118 opened is formed on the exhaust downstream side. The exhaust inlet 114 and the exhaust outlet 118 are each connected by three exhaust passages 122.

  The exhaust cooling adapter 102 uses bolt fastening portions 116 a and 120 a provided at the peripheral edge portion to connect the cylinder head 108 and the exhaust manifold 110 by bolt fastening.

  A water jacket 124 is formed around the exhaust passage 122 in the wall of the exhaust cooling adapter 102. Cooling water is introduced into the water jacket 124 via the cooling water inlet 126a of the cooling water inlet 126, and the cooling water in the water jacket 124 is externally supplied from the cooling water outlet 128a of the cooling water outlet 128. It is discharged to the reflux path.

  As shown in FIGS. 10 and 11, an EGR exhaust supply passage 130b is formed in the cooling water passage 124a in the lower portion of the water jacket 124 via a partition wall 130a. The EGR exhaust supply passage 130 b is formed in the water jacket 124 along the arrangement direction of the exhaust passage 122. An EGR exhaust introduction portion 130c is formed on one end side of the EGR exhaust supply passage 130b so as to protrude to the outside, and enters the EGR exhaust supply passage 130b through an EGR exhaust introduction port 130d formed inside. EGR exhaust is introduced. An EGR exhaust discharge portion 130e is formed on the other end side of the EGR exhaust supply passage 130b so as to protrude to the outside, and from the inside of the EGR exhaust supply passage 130b via an EGR exhaust discharge port 130f formed inside. EGR exhaust is discharged.

  An introduction pipe 130g is connected to the EGR exhaust introduction portion 130c, and exhaust gas is introduced from the downstream side of the catalytic converter 112 into the EGR exhaust supply path 130b via the EGR exhaust introduction port 130d. The EGR exhaust discharge section 130e discharges the EGR exhaust cooled in the EGR exhaust supply path 130b through the EGR exhaust discharge port 130f. As a result, the exhaust gas cooled in the EGR exhaust supply passage 130b is supplied to the intake side via the EGR valve. Therefore, the EGR exhaust supply path 130b surrounded by the partition wall 130a corresponds to the function as the EGR cooler 130.

  According to the second embodiment described above, the effects of the first embodiment are produced, and the EGR exhaust supply path 130b for cooling the EGR exhaust can be further lengthened. High cooling effect is produced.

[Other embodiments]
-In each of the above embodiments, the EGR exhaust was introduced into the EGR cooler from the downstream side of the catalytic converter. In addition to this, a separate filter for collecting deposit was provided in the EGR exhaust introduction pipe. In this case, the EGR exhaust gas may be introduced into the EGR cooler from the upstream side of the catalytic converter, for example, from the exhaust manifold portion of the exhaust manifold.

  ・ Furthermore, the exhaust gas that has flowed from the exhaust passage of the exhaust cooling adapter to the exhaust passage on the exhaust manifold side is cooled to some extent, so that the EGR exhaust is removed from the exhaust manifold exhaust passage upstream of the exhaust collecting portion. You may introduce into an EGR cooler. This shortens the introduction pipe and further saves space.

  In the first embodiment, in the exhaust cooling adapter, the water jacket is disposed only on one side of the EGR exhaust supply path with respect to the EGR exhaust supply path. Instead of this, a water jacket may be arranged on the entire circumference of the EGR exhaust supply passage in the same manner as the exhaust passage.

Similarly in the second embodiment, a water jacket may be arranged on the entire circumference of the EGR exhaust supply path.
In FIG. 1, the introduction pipe 30b introduces exhaust gas into the EGR exhaust supply passage 30a through the EGR introduction hole 10d formed in the flange 10b on the exhaust manifold 10 side. The introduction pipe 30b may be directly connected to the EGR exhaust supply path 30a.

  In the exhaust cooling adapter, a passage may be formed between the exhaust passage and the EGR exhaust supply passage in the wall portion on the exhaust downstream side, avoiding the water jacket. As a result, the exhaust gas flowing in the exhaust passage can be directly introduced into the EGR exhaust supply passage through this passage without using an introduction pipe. Therefore, the introduction pipe can be omitted, and further space saving can be achieved.

  In each of the embodiments described above, the EGR exhaust cooling structure is incorporated in the exhaust cooling adapter, but it is also possible to cool a fluid other than the EGR exhaust. For example, a cooling unit as an oil cooler for cooling engine oil may be incorporated into the exhaust cooling adapter as in the EGR exhaust supply path of the first and second embodiments.

  2 ... Exhaust cooling adapter, 4 ... Internal combustion engine, 4a ... Cylinder, 4b ... Combustion chamber, 4c ... Exhaust valve, 6 ... Internal combustion engine exhaust cooling system, 8 ... Cylinder head, 8a ... Exhaust port, 8b ... Adapter connection surface, DESCRIPTION OF SYMBOLS 10 ... Exhaust manifold, 10a ... Exhaust collecting part, 10b ... Flange, 10c ... Exhaust flow path, 10d ... EGR introduction hole, 12 ... Catalytic converter, 14 ... Exhaust introduction port, 16 ... Cylinder head side connection surface, 16a ... Bolt fastening , 16b: bolt insertion hole, 18: exhaust outlet, 20 ... exhaust manifold side connection surface, 20a ... bolt fastening part, 20b ... screwing hole, 22 ... exhaust passage, 24 ... water jacket, 24a, 24b, 24c 24d, 24e, 24f ... cooling water flow path, 26 ... cooling water introduction part, 26a ... cooling water introduction port, 28 ... cooling water discharge part, 28a ... cooling water Outlet, 30 ... EGR cooler, 30a ... EGR exhaust supply passage, 30b ... Inlet pipe, 30c ... Outlet, 102 ... Exhaust cooling adapter, 104 ... Internal combustion engine, 106 ... Internal combustion engine exhaust cooling system, 108 ... Cylinder head, 108a ... exhaust port, 110 ... exhaust manifold, 112 ... catalytic converter, 114 ... exhaust inlet, 116 ... cylinder head side connection surface, 116a ... bolt fastening portion, 118 ... exhaust exhaust port, 120 ... exhaust manifold side connection surface, 120a DESCRIPTION OF SYMBOLS ... Bolt fastening part, 122 ... Exhaust flow path, 124 ... Water jacket, 124a ... Cooling water flow path, 126 ... Cooling water introduction part, 126a ... Cooling water introduction port, 128 ... Cooling water discharge part, 128a ... Cooling water discharge port, 130 ... EGR cooler, 130a ... partition wall, 130b ... exhaust gas supply passage for EGR, 30c ... EGR exhaust inlet portion, 130d ... EGR exhaust inlet port, 130e ... exhaust discharge unit for EGR, 130f ... EGR exhaust outlet, 130g ... inlet tube, B1, B2 ... bolt.

Claims (10)

An exhaust cooling system for an internal combustion engine, wherein an EGR cooler is disposed between an exhaust port that opens to a cylinder head of the internal combustion engine and an exhaust manifold. 2. The internal combustion engine exhaust cooling system according to claim 1, wherein the EGR cooler has a cooling water passage formed in a wall surrounding the exhaust passage by disposing an exhaust passage between the exhaust port and the exhaust manifold. 3. An exhaust cooling system for an internal combustion engine, which also serves as an exhaust cooling adapter that cools the exhaust flowing through the exhaust flow path by flowing cooling water through the internal combustion engine. 3. The internal combustion engine exhaust cooling system according to claim 2, wherein the EGR cooler has an EGR exhaust cooling flow path formed in the wall separately from the exhaust flow path and the cooling water flow path. An internal combustion engine exhaust cooling system. The internal combustion engine exhaust cooling system according to claim 3, wherein the cooling water passage is disposed between the exhaust cooling passage and the exhaust passage. 5. The internal combustion engine exhaust cooling system according to claim 3, further comprising an exhaust introduction path for introducing the exhaust once exhausted from the exhaust flow path into the exhaust cooling flow path. Exhaust cooling system. 6. The internal combustion engine exhaust cooling system according to claim 5, wherein the exhaust introduction path introduces exhaust into the exhaust cooling flow path from a downstream side of an exhaust collecting portion of the exhaust manifold. Cooling system. 6. The internal combustion engine exhaust cooling system according to claim 5, wherein the exhaust introduction path introduces exhaust into the exhaust cooling flow path from a downstream side of an exhaust purification catalyst attached to the exhaust manifold. Internal combustion engine exhaust cooling system. The exhaust gas flowing through the exhaust flow path is cooled by flowing cooling water through a cooling water flow path that is disposed between the exhaust port that opens to the cylinder head of the internal combustion engine and the exhaust manifold, and that is formed in the wall surrounding the exhaust flow path. An exhaust cooling adapter,
An exhaust cooling adapter, wherein a fluid cooling passage is formed in the wall separately from the exhaust flow path. 9. The exhaust cooling adapter according to claim 8, wherein the fluid cooling passage is an EGR cooler that cools the exhaust for EGR. The exhaust cooling adapter according to claim 8, wherein the fluid cooling passage is an oil cooler that cools engine oil.

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