JP5803312B2 - Cooling structure of a supercharged internal combustion engine - Google Patents

Description

  The present invention relates to a cooling structure for an internal combustion engine with a supercharger.

  In an internal combustion engine equipped with a supercharger, an outer periphery of a turbine wheel of the supercharger is surrounded by a spiral scroll portion of a turbine housing. The turbine housing (scroll portion) has a spiral exhaust passage that forms part of the exhaust passage. In this internal combustion engine, in the process in which exhaust gas generated by the operation of the internal combustion engine flows through the exhaust passage, it is blown to the turbine wheel through the exhaust passage in the turbine housing (scroll portion), and the turbine wheel is driven to rotate. To do. Accordingly, the compressor wheel coaxial with the turbine wheel rotates integrally with the turbine wheel to perform supercharging.

  In this supercharger-equipped internal combustion engine, high-temperature exhaust gas flows through the exhaust passage, so that the turbine housing becomes hot. For this reason, various structures for cooling the turbine housing are considered. As one of them, a water jacket is provided outside the outer wall of the turbine housing, and the coolant used for cooling the exhaust gas of the internal combustion engine is guided to the water jacket (see, for example, Patent Document 1). ). In this cooling structure, the outer wall of the turbine housing is exclusively cooled by the coolant flowing through the water jacket.

JP 2008-190503 A (FIG. 3)

  By the way, as one form of the internal combustion engine with a supercharger, there is one in which an exhaust passage is divided into a plurality of (usually two) divided passages by a partition wall. In this type of internal combustion engine, a plurality of cylinders are divided into a plurality of groups (usually two), and exhaust gas is blown to the turbine wheel through a divided flow path corresponding to each group. Exhaust interference is suppressed.

  And also about this type of internal combustion engine, it is possible to employ | adopt the cooling structure of the said patent document 1. FIG. In this case, the outer wall of the turbine housing can be cooled by the coolant flowing through the water jacket. However, it is difficult to cool the adjacent divided flow paths (partitions) in the turbine housing to a sufficiently low temperature. This is because between the adjacent divided flow paths (partitions), heat is transferred from the exhaust flowing through the divided flow paths on both sides, so the amount of heat received is particularly high, but it is away from the water jacket outside the outer wall. This is because the cooling effect of the coolant is difficult to reach between adjacent divided flow paths (partition walls).

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cooling structure for an internal combustion engine with a supercharger that can promote cooling between adjacent divided flow paths. is there.

In the following, means for achieving the above object and its effects are described.
The invention described in claim 1 includes a turbine housing that surrounds an outer periphery of a turbine wheel of a turbocharger, and an exhaust manifold that is disposed on the exhaust upstream side of the turbine housing, and is provided in the exhaust manifold and the turbine housing. Is an area that extends from the exhaust manifold to the turbine housing , and is applied to an internal combustion engine in which an exhaust passage that forms part of the exhaust passage is provided and the exhaust passage is divided into a plurality of divided passages. Thus, the gist is that a water jacket through which the coolant flows is provided only between the adjacent divided flow paths.

  According to the above configuration, the exhaust gas of the internal combustion engine flows through the plurality of divided flow paths that constitute the exhaust flow paths in the exhaust manifold and the turbine housing in the process of flowing through the exhaust passage. Between adjacent divided flow paths, the heat of the exhaust gas flowing through both divided flow paths is received from both sides, so that the temperature tends to be high.

  However, in the first aspect of the present invention, the water jacket is provided in the region between the adjacent divided flow paths and from the exhaust manifold to the turbine housing, and the coolant flows therethrough. Heat exchange is performed between the coolant and the exhaust gas in the course of this circulation, so that cooling between adjacent divided flow paths is promoted.

  According to a second aspect of the present invention, in the first aspect of the present invention, an inlet for introducing the coolant into the water jacket is provided in a lower portion of the water jacket, and the coolant is supplied from the water jacket. The gist of the present invention is that a discharge port for discharging the water is provided above the introduction port of the water jacket.

  The cooling liquid is introduced into the water jacket from an inlet provided in the lower part of the water jacket. After the coolant flows upward in the water jacket, the coolant is discharged to the outside of the water jacket from a discharge port provided above the introduction port.

  Here, when the coolant in the water jacket is heated (boiling) by the heat of the exhaust and bubbles are generated, the coolant flows upward in the water jacket with the bubbles. At this time, since the bubbles are likely to rise, the bubbles are quickly discharged from the discharge port to the outside of the water jacket.

  The invention according to claim 3 is the invention according to claim 2, wherein the exhaust manifold is disposed above the turbine housing, the introduction port is provided in the turbine housing, and the exhaust port is the The gist is that it is provided in the exhaust manifold.

  The amount of heat received from the exhaust between the adjacent divided flow paths is larger than that in the exhaust manifold in the turbine housing around the turbine wheel, and it is considered that the temperature between adjacent divided flow paths in the turbine housing tends to be higher.

  In this regard, in the invention described in claim 3, a coolant having a low temperature before receiving heat is introduced into the water jacket from the introduction port provided in the turbine housing. Therefore, cooling between the divided flow paths in the turbine housing, which are likely to become higher in temperature, is preferentially performed between the divided flow paths in the exhaust manifold. Then, the coolant that has received heat in the process of flowing through the water jacket and has risen in temperature is used for cooling between adjacent divided flow paths in the exhaust manifold, and then the water jacket is discharged from an outlet provided in the exhaust manifold. It is discharged outside.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the water jacket is provided in the internal combustion engine, and the exhaust gas of the internal combustion engine is cooled with a coolant. The exhaust cooling device is connected, and the cooling liquid after being used for cooling the exhaust gas by the exhaust cooling device is introduced into the water jacket.

  According to the above configuration, for the water jacket, the coolant after being used for cooling the exhaust gas of the internal combustion engine by the exhaust cooling device is introduced into the water jacket. The exhaust cooling device, the exhaust manifold, and the turbine housing are also provided in the internal combustion engine and are close to each other. Therefore, a pipe line for guiding the coolant from the exhaust cooling device to the water jacket is short, and piping is easy.

1 is a perspective view of an exhaust manifold and a turbine housing to which a cooling structure is applied in an embodiment embodying the present invention. The top view of FIG. Sectional drawing which shows the cross-section along the AA line of FIG. Sectional drawing which shows the cross-sectional structure along the BB line of FIG. Sectional drawing which shows the cross-sectional structure along CC line | wire of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying a cooling structure for an internal combustion engine with a supercharger according to the present invention will be described with reference to the drawings.
A two-dot chain line in FIG. 2 indicates an internal combustion engine body 11 that is a main part of the internal combustion engine 10 and has four cylinders # 1, # 2, # 3, and # 4. In the internal combustion engine main body 11, a fuel / air mixture is combusted in the combustion chambers (not shown) of the cylinders # 1 to # 4. Combustion is performed, for example, in the order of cylinder # 1 → cylinder # 3 → cylinder # 4 → cylinder # 2 or cylinder # 1 → cylinder # 2 → cylinder # 4 → cylinder # 3. The piston is reciprocated by the high-temperature and high-pressure combustion gas generated by the combustion, the engine output shaft (both not shown) is rotated, and the driving force (torque) of the internal combustion engine 10 is obtained.

  As shown in FIGS. 1 and 2, a part of the exhaust passage for exhausting combustion gas as exhaust to the outside of the internal combustion engine body 11 is provided in each of the exhaust manifold 20 and the turbine housing 30 of the supercharger 40. It is constituted by an exhaust passage. In this embodiment, the exhaust manifold 20 and the turbine housing 30 are integrally formed, and in the flange portion 24 provided in the upstream portion (exhaust upstream portion) of the exhaust manifold 20 in the exhaust flow direction. , Bolts, nuts and the like are fastened to the internal combustion engine body 11.

  FIG. 3 shows a cross-sectional structure of the downstream portion (exhaust downstream portion) in the exhaust manifold 20 in the exhaust flow direction. As shown in FIGS. 2 and 3, the exhaust manifold 20 has an exhaust passage through which exhaust exhausted from the cylinders # 1 to # 4 of the internal combustion engine body 11 flows. The two exhaust passages through which the exhaust discharged from each of the cylinder # 1 and the cylinder # 4 flows are joined at the downstream portion in the exhaust manifold 20 in the exhaust flow direction to form one passage (port 21). Yes. The two exhaust passages through which the exhaust discharged from the cylinder # 2 and the cylinder # 3 respectively flow are joined at the downstream portion in the exhaust manifold 20 in the exhaust flow direction to form one passage (port 22). Yes. Both ports 21 and 22 are adjacent to each other via a partition wall 23 in the downstream portion of the exhaust manifold 20. In other words, in the downstream portion of the exhaust manifold 20, the exhaust passage is divided into two ports 21 and 22 by the partition wall 23.

  As shown in FIGS. 1 and 2, the turbine housing 30 constitutes a part of the supercharger 40, and is disposed downstream of the exhaust manifold 20 in the exhaust flow direction (exhaust downstream side). Has been. In the vertical direction, the turbine housing 30 is disposed below the exhaust manifold 20 (see FIG. 5). The turbine housing 30 includes a spiral scroll portion 31 that surrounds the outer periphery of the turbine wheel 41 (see FIG. 5) of the supercharger 40.

  FIG. 4 shows a cross-sectional structure of the scroll portion 31 in the turbine housing 30. As shown in FIGS. 2 and 4, the exhaust passage in the scroll portion 31 is divided into two scroll passages 33 and 34 by a partition wall 32, similar to the ports 21 and 22.

  One scroll passage 33 is connected to the port 21, and the exhaust discharged from the cylinder # 1 and the cylinder # 4 flows into the scroll passage 33 through the port 21. The other scroll passage 34 is connected to the port 22, and the exhaust discharged from the cylinder # 2 and the cylinder # 3 flows into the scroll passage 34 through the port 22. Both scroll flow paths 33 and 34 are adjacent to each other with a partition wall 32 interposed therebetween. Further, the scroll flow paths 33 and 34 are open toward the turbine wheel 41 at the inner peripheral portion thereof.

  As described above, in the present embodiment, the four cylinders # 1 to # 4 are divided into two groups of cylinders whose exhaust strokes are not adjacent to each other, and the exhaust gas is independently in the vicinity of the turbine wheel 41 of the supercharger 40 for each group. Thus, the exhaust interference between the cylinders # 1 to # 4 is suppressed.

  Exhaust gas flowing through the scroll flow paths 33 and 34 is blown to the turbine wheel 41 through the opening portions of the scroll flow paths 33 and 34. And the turbine wheel 41 is rotationally driven by this spraying. With this rotational drive, a compressor wheel (both not shown) attached to the turbine wheel 41 through a shaft so as to be integrally rotatable rotates to perform supercharging.

  In the present embodiment, the port 21 and the scroll flow path 33 constitute a spiral divided flow path P1 that surrounds the turbine wheel 41. Further, the port 22 and the scroll flow path 34 constitute a spiral divided flow path P2 that surrounds the turbine wheel 41 in a state independent of the divided flow path P1. In this way, the exhaust passages in the exhaust manifold 20 and the turbine housing 30 are divided into two divided passages P1 and P2 by the partition walls 23 and 32.

  Further, in the present embodiment, as shown in FIGS. 3 to 5, in the partition walls 23, 32 between the adjacent divided flow paths P 1, P 2, from the exhaust upstream portion of the exhaust manifold 20 to the exhaust downstream of the turbine housing 30. A water jacket WJ through which the coolant L circulates is provided in a region extending from the section. In FIG. 5, the water jacket WJ is shown by a two-dot chain line. The water jacket WJ surrounds the turbine wheel 41 in the scroll portion 31 of the turbine housing 30.

  In the present embodiment, no particular measures such as increasing the thickness of the partition walls 23 and 32 are taken in order to form the water jacket WJ. Further, the outer shapes of the exhaust manifold 20 and the turbine housing 30 are not particularly large with the formation of the water jacket WJ, and each outer shape is substantially the same as the outer shape when the water jacket WJ is not provided. It is. A water jacket is not provided outside the outer wall of the scroll portion 31.

  As shown in FIG. 5, an inlet 35 for introducing the coolant L into the water jacket WJ is provided below the water jacket WJ. In the present embodiment in which the turbine housing 30 is disposed on the lower side of the exhaust manifold 20, the introduction port 35 is located on the side surface of the scroll portion 31 and below the turbine wheel 41 (in this embodiment, the water jacket WJ). At the bottom).

  An exhaust cooling device 50 that is provided in the internal combustion engine 10 and cools the exhaust gas of the internal combustion engine 10 with the coolant L is connected to the introduction port 35 via a pipe line 51. The coolant L after being used for cooling the exhaust gas by the exhaust cooling device 50 is introduced into the water jacket WJ through the conduit 51 and the introduction port 35. As the exhaust gas cooling device 50, for example, a part of the exhaust gas discharged into the exhaust passage and returned to the intake system of the internal combustion engine 10 by EGR (exhaust gas recirculation device) is cooled using the coolant L. EGR cooler to do. The EGR cooler is located near the exhaust manifold 20 and the turbine housing 30.

  On the other hand, a discharge port 36 for discharging the coolant L from the water jacket WJ is provided above the introduction port 35 of the water jacket WJ. In the present embodiment in which the exhaust manifold 20 is disposed on the upper side of the turbine housing 30, the exhaust port 36 is open on the upper surface of the exhaust manifold 20 (see FIGS. 1 and 2).

Next, the operation of the cooling structure of the present embodiment configured as described above will be described.
The exhaust gas of the internal combustion engine 10 flows through the plurality of divided flow paths P1 and P2 in the exhaust manifold 20 and the turbine housing 30 in the process of flowing through the exhaust passage. The heat of the exhaust gas flowing through these divided flow paths P1 and P2 raises the temperature of the outer wall surrounding each divided flow path P1 and P2 in the exhaust manifold 20 and the turbine housing 30. However, the outer wall is cooled by outside air that is in contact with the outer wall from the outside.

Further, between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) receives heat from the exhaust gas flowing through both the divided flow paths P1 and P2 from both sides, and thus is likely to be hotter than the outer wall.
However, in the present embodiment, the coolant L flows through the water jacket WJ provided between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) and from the exhaust manifold 20 to the turbine housing 30. . Specifically, the coolant L having a relatively low temperature after being used for cooling the exhaust gas in the exhaust cooling device 50 flows through the pipe 51 and is introduced from the inlet 35 provided at the lowermost portion of the water jacket WJ to the turbine housing 30. It is introduced to the water jacket WJ. As shown by the two-dot chain line arrow in FIG. 5, the coolant L passes through the inlet 35, then divides into two in opposite directions, and flows upward so as to surround the turbine wheel 41. In the vicinity of the upper part of the turbine wheel 41, they merge to become one. After the merge, the coolant L flows through the water jacket WJ in the exhaust manifold 20 toward the discharge port 36. In the process of flowing in the water jacket WJ between the introduction port 35 and the discharge port 36, heat exchange is performed between the coolant L and the exhaust gas, thereby promoting cooling between the adjacent divided flow paths P1 and P2. The temperature of the partition walls 23 and 32 is lowered.

  Here, the amount of heat received from the exhaust between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) is larger than that in the exhaust manifold 20 in the turbine housing 30 (scroll portion 31) around the turbine wheel 41. It is considered that the temperature between the adjacent divided flow paths P1 and P2 (partition wall 32) in the housing 30 (scroll part 31) is likely to be higher.

  In this respect, in the present embodiment, the coolant L having a relatively low temperature before receiving heat is introduced into the water jacket WJ from the introduction port 35 provided in the turbine housing 30 (the scroll portion 31). Therefore, the space between the divided flow paths P1 and P2 (partition wall 32) in the turbine housing 30 that tends to become higher temperature is cooled in preference to the space between the divided flow paths P1 and P2 in the exhaust manifold 20 (partition wall 23).

  As described above, the coolant L that has received heat in the process of flowing upward in the water jacket WJ and has risen in temperature is discharged from the discharge port 36 provided above the introduction port 35 in the exhaust manifold 20. It is discharged outside the water jacket WJ.

  Here, if a cooling structure in which the water jacket WJ is provided outside the outer walls of the turbine housing 30 and the exhaust manifold 20 is adopted, the flow rate of the coolant L is large because the area in which the water jacket WJ is provided is wide. There is a concern that the cooling efficiency will decrease.

  In this respect, in the present embodiment in which the water jacket WJ is provided between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32), the range in which the water jacket WJ is provided is smaller than that described above. The flow rate of the coolant L is increased.

  Further, when the coolant L in the water jacket WJ is warmed (boiling) by the exhaust heat and bubbles are generated, the coolant L flows upward in the water jacket WJ along with the bubbles. At this time, since the bubbles tend to rise, the bubbles move quickly along the flow of the coolant L and are quickly discharged from the discharge port 36.

According to the embodiment described in detail above, the following effects can be obtained.
(1) A water jacket WJ through which the coolant L flows is provided in a region between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) from the exhaust manifold 20 to the turbine housing 30.

  Accordingly, between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32), the heat of the exhaust gas flowing through both the divided flow paths P1 and P2 is easily received from both sides, but the temperature tends to become high, but the coolant flowing in the water jacket WJ. By L, cooling between the divided flow paths P1 and P2 (partition walls 23 and 32) can be promoted.

  Further, the range in which the water jacket WJ is provided can be made smaller than the case where the water jacket is provided outside the outer walls of the turbine housing 30 and the exhaust manifold 20, and the heat exchange rate is increased by increasing the flow rate of the coolant L. Cooling efficiency can be increased.

  Furthermore, since the exhaust of the divided flow paths P1, P2 on both sides of the partition walls 23, 32 is cooled by the coolant L flowing through the water jacket WJ, a large cooling area can be secured and the cooling efficiency can be increased.

  For these reasons, it is possible to suppress the concentration of thermal stress between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32). As a result, the exhaust manifold 20 and the turbine housing 30 can be formed even with a material having lower heat resistance, and the cost can be reduced.

  (2) If a configuration in which the turbine housing 30 and the exhaust manifold 20 are covered with another outer wall in order to form the water jacket WJ outside the outer walls of the turbine housing 30 and the exhaust manifold 20, the water jacket is used. The formation range of WJ becomes large, the flow rate of the cooling liquid L is low, and the cooling liquid L may stagnate and boil.

  In this embodiment, in which the water jacket WJ is provided between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32), the flow rate of the coolant L can be increased as described above. It makes it difficult to squeeze and suppress boiling.

(3) The water jacket WJ is provided not only in the partition wall 32 in the turbine housing 30 but also in the partition wall 23 in the exhaust manifold 20 to lengthen the water jacket WJ.
Therefore, compared with the case where the water jacket WJ is provided only on the partition wall 32 in the turbine housing 30, cooling between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) can be further promoted.

  (4) If the same structure as the above (2) is adopted as the cooling structure, an outer wall for forming the water jacket WJ is further provided outside the outer walls of the turbine housing 30 and the exhaust manifold 20. As a result, the outer shapes of the turbine housing 30 and the exhaust manifold 20 may be increased accordingly.

  However, in this embodiment, the water jacket WJ is provided only inside the partition walls 23 and 32 between the adjacent divided flow paths P1 and P2. The water jacket WJ is not provided outside the outer walls of the turbine housing 30 and the exhaust manifold 20. Therefore, the turbine housing 30 and the exhaust manifold 20 accompanying the addition of the water jacket WJ can be prevented from being enlarged, and the whole can be made compact. As a result, the mountability of the turbine housing 30 and the exhaust manifold 20 on the internal combustion engine 10 can be improved.

(5) An inlet 35 for the coolant L is provided below the water jacket WJ, and an outlet 36 for the coolant L is provided above the inlet 35 of the water jacket WJ.
Therefore, even if the temperature of the coolant L in the water jacket WJ rises due to the heat of the exhaust and bubbles are generated, the bubbles can be quickly discharged to the outside of the water jacket WJ.

(6) The introduction port 35 is provided in the turbine housing 30, and the exhaust port 36 is provided in the exhaust manifold 20 above the turbine housing 30.
Therefore, the divided flow in the turbine housing 30 (scroll part 31), which is considered to have a higher amount of heat received from the exhaust than the exhaust manifold 20 between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32), is likely to become high temperature. The space between the paths P1 and P2 (the partition walls 23 and 32) can be preferentially cooled by the coolant L having a low temperature before receiving heat.

  The coolant L receives heat in the process of flowing through the water jacket WJ, so that the temperature increases as the coolant L moves away from the inlet 35. However, in the exhaust manifold 20, the temperature between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) is lower than that of the turbine housing 30 (scroll portion 31). Therefore, even if the coolant L is slightly heated due to heat reception, the space between the adjacent divided flow paths P1 and P2 (partition walls 23 and 32) in the exhaust manifold 20 can be satisfactorily cooled.

  (7) The exhaust cooling device 50 that cools the exhaust gas of the internal combustion engine 10 with the coolant L is connected to the inlet 35 of the water jacket WJ via the pipe line 51, and the exhaust cooling device 50 cools the exhaust gas. The coolant L after being used is introduced into the water jacket WJ.

  The exhaust cooling device 50 and the exhaust manifold 20 and the turbine housing 30 are also provided in the internal combustion engine 10 and are close to each other. Therefore, the pipe line 51 for guiding the coolant L from the exhaust cooling device 50 to the water jacket WJ can be shortened, and piping becomes easy.

Note that the present invention can be embodied in another embodiment described below.
-The cooling structure of this invention is applicable also when the exhaust manifold 20 and the turbine housing 30 of the supercharger 40 are formed separately, and both are connected through a gasket etc. FIG.

The cooling structure of the present invention can be applied to an internal combustion engine having a number of cylinders different from the four cylinders, for example, a plurality of cylinders such as five cylinders, six cylinders, and eight cylinders.
When the coolant passage is provided in the bearing housing that rotatably supports the shaft of the supercharger 40, the coolant passage and the water jacket are connected by a pipe line. The coolant after passing through the coolant passage and used for cooling may be guided into the water jacket WJ through the pipe line and the introduction port 35. In this case, the pipe line to be added can be shorter than that in the above embodiment.

  As the coolant flowing in the water jacket WJ, a coolant for cooling the internal combustion engine main body 11 may be used, or a different coolant may be used. For example, a dedicated coolant can be used.

  The cooling structure of the present invention can also be applied to an internal combustion engine in which the exhaust passages in the exhaust manifold 20 and the turbine housing 30 are divided into three or more divided passages. Also in this case, a water jacket WJ is provided between adjacent divided flow paths.

  When the sizes of the exhaust manifold 20 and the turbine housing 30 do not matter so much, the water jacket WJ is added between the adjacent divided flow paths P1, P2 (partition walls 23, 32), and the divided flow paths P1, It may be provided outside P2. In this case, the water jacket WJ may be provided inside the outer wall surrounding the divided flow paths P1 and P2 or outside the outer wall.

In the above embodiment, the introduction port 35 is provided at the lowermost part of the water jacket WJ, but may be provided at a place higher than the lowermost part.
-The cooling structure of this invention is applicable also to what the exhaust manifold 20 and the turbine housing 30 are arrange | positioned with the positional relationship different from the said embodiment (the exhaust manifold 20 is an upper side, and the turbine housing 30 is a lower side).

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 20 ... Exhaust manifold, 30 ... Turbine housing, 35 ... Inlet port, 36 ... Discharge port, 40 ... Supercharger, 41 ... Turbine wheel, 50 ... Exhaust cooling device, L ... Coolant, P1, P2 ... divided flow path, WJ ... water jacket.

Claims (4)

A turbine housing surrounding an outer periphery of a turbine wheel of the supercharger; and an exhaust manifold disposed on an exhaust upstream side of the turbine housing. The exhaust manifold and the turbine housing form a part of an exhaust passage. An exhaust passage is provided, and further, the exhaust passage is applied to an internal combustion engine divided into a plurality of divided passages,
A cooling structure for an internal combustion engine with a supercharger, wherein a water jacket through which a coolant flows is provided only in the region from the exhaust manifold to the turbine housing and between the adjacent divided flow paths. . An inlet for introducing the coolant into the water jacket is provided in a lower portion of the water jacket, and an outlet for discharging the coolant from the water jacket is more than the inlet of the water jacket. The cooling structure for an internal combustion engine with a supercharger according to claim 1, which is provided on an upper side. The internal combustion engine with a supercharger according to claim 2, wherein the exhaust manifold is disposed above the turbine housing, the introduction port is provided in the turbine housing, and the exhaust port is provided in the exhaust manifold. Engine cooling structure. The water jacket is connected to an exhaust cooling device that is provided in the internal combustion engine and cools the exhaust gas of the internal combustion engine with a coolant, and is used for cooling the exhaust gas in the exhaust cooling device. The cooling structure for a supercharged internal combustion engine according to any one of claims 1 to 3, wherein the coolant is introduced into the water jacket.

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