JP4905573B2 - Internal combustion engine exhaust cooling system - Google Patents

Internal combustion engine exhaust cooling system Download PDF

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JP4905573B2
JP4905573B2 JP2010066974A JP2010066974A JP4905573B2 JP 4905573 B2 JP4905573 B2 JP 4905573B2 JP 2010066974 A JP2010066974 A JP 2010066974A JP 2010066974 A JP2010066974 A JP 2010066974A JP 4905573 B2 JP4905573 B2 JP 4905573B2
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exhaust
cooling water
flow path
cooling
direction
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JP2011196351A (en
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信一 三谷
富士夫 井上
哲治 渡邊
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トヨタ自動車株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00Liquid cooling
    • F01P3/12Arrangements for cooling other engine or machine parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00Cooling circuits using auxiliaries
    • F01P2060/16Outlet manifold

Description

  The present invention relates to an exhaust cooling adapter for cooling exhaust flowing in an exhaust flow path by flowing cooling water in a cooling water flow path formed in a wall surrounding the exhaust flow path, an exhaust port opening to a cylinder head, and an exhaust branch pipe The present invention relates to an internal combustion engine exhaust cooling system.

2. Description of the Related Art A technique for cooling exhaust gas in order to prevent heat damage in an exhaust system of an internal combustion engine is known (see, for example, Patent Documents 1 and 2).
In Patent Document 1, a connecting member is provided between the cylinder head and the exhaust branch pipe, and a cooling water flow path is provided in the connecting member. The cooling water flow path is formed as a recess, and the cooling water introduced from the lower ends of the cooling water flow path immediately flows into the cooling water flow path on the exhaust branch pipe side.

  In Patent Document 2, a first exhaust cooling adapter is disposed between the cylinder head and the exhaust branch pipe, and a second exhaust cooling adapter is disposed between the exhaust branch pipe and the turbocharger. In the cooling water flow path of the first exhaust cooling adapter, the cooling water passes through the lower side of the array from an inlet provided at the lower end of the array of exhaust flow passages corresponding to the exhaust ports, and this is passed to the opposite end. Then, the cooling water is discharged to the outside from the outlet immediately above the inlet through the upper side of the array. As a result, the exhaust just after exiting the exhaust port is cooled by the exhaust cooling adapter. In the second exhaust cooling adapter, a cooling water introduction port and a cooling water discharge port are formed diagonally to the cooling water passage formed around one exhaust passage, and the cooling water is supplied around the exhaust passage. By flowing, the exhaust gas that has already been cooled by the first exhaust cooling adapter is recooled between the exhaust branch pipe and the turbocharger.

Japanese Patent Laid-Open No. 11-49096 (page 3-4, FIG. 2-5) Japanese Utility Model Publication No. 64-15718 (page 1-13, Fig. 2-5)

  The exhaust discharged from the combustion chamber of the internal combustion engine through the exhaust port is not a uniform flow in the exhaust flow path, but the shape of the exhaust port, the arrangement relationship between the exhaust port and the exhaust cooling adapter connected thereto, or Depending on the shape of the exhaust cooling adapter, the exhaust flow may be non-uniform or the exhaust may be blown. As a result, a large temperature difference occurs on the inner surface of the exhaust cooling adapter, which may cause a deterioration in exhaust cooling performance.

  In the connecting member of Patent Document 1, the recess as the cooling water flow path is provided to supply cooling water to the exhaust branch pipe side, and therefore the shape of the recess itself does not sufficiently surround the exhaust flow path. Since the cooling water does not sufficiently flow into the recess and immediately flows to the exhaust branch pipe side, the function of cooling the exhaust discharged from the exhaust port on the cylinder head side is very low. Therefore, it is not a technology that can efficiently cool the exhaust passage of the exhaust cooling adapter.

  In the first exhaust cooling adapter in Patent Document 2, the exhaust discharged from the exhaust port of the internal combustion engine is cooled by flowing the cooling water uniformly over the entire circumference of the exhaust passage. In such uniform cooling, in order to sufficiently cool the exhaust even in the high temperature portion caused by the temperature difference described above, a large amount of cooling water is allowed to flow as a whole in the water jacket of the first exhaust cooling adapter. There is a need. In such a method, the exhaust cooling adapter is increased in size or the burden on the water flow pump is increased. Therefore, there is a possibility that the weight of the internal combustion engine and the fuel consumption deteriorate.

  In the second exhaust cooling adapter in Patent Document 2, the second cooling is simply performed to protect the turbocharger, and the object to be cooled is not the high-temperature exhaust from the exhaust port, but the temperature difference described above. Is not considered, and the flow of cooling water does not actually deal with the temperature difference.

  An object of the present invention is to provide an internal combustion engine exhaust cooling system capable of efficiently cooling the exhaust flow path of the exhaust cooling adapter without increasing the size of the exhaust cooling adapter or increasing the burden on the water flow pump. is there.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
An exhaust cooling system for an internal combustion engine according to claim 1, wherein an exhaust cooling adapter for cooling the exhaust flowing through the exhaust passage by flowing the cooling water through a cooling water passage formed in a wall surrounding the exhaust passage is provided with a cylinder head. An exhaust cooling system for an internal combustion engine disposed between an exhaust port opened to the exhaust branch pipe and the exhaust cooling adapter, wherein the exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water flow path, and the cooling A cooling water discharge port for discharging cooling water to the outside from the water flow path, and the cooling water flow path is classified in accordance with a deviation in the amount of heat received from the exhaust in the circumferential direction of the inner surface of the exhaust flow path A side flow path, a low heat receiving side flow path, and two intermediate flow paths connecting the high heat receiving side flow path and the low heat receiving side flow path at both ends, and the cooling water discharge direction of the cooling water inlet is the The inside of one of the two intermediate flow paths The cooling water discharge port is cooled from a position where the other of the two intermediate flow paths and the high heat receiving side flow path are connected or in the vicinity of this position. It is characterized by draining water.

  In the internal combustion engine exhaust cooling system, in the exhaust cooling adapter, the cooling water discharged from the cooling water inlet to the cooling water flow path immediately passes through one of the two intermediate flow paths from the low heat receiving side flow path side to the high heat receiving side. It goes to the flow path side.

  For this reason, the water flow of the cooling water discharged from the cooling water inlet is sufficiently transmitted to the high heat receiving side flow path. There is little transmission of water to the low heat-receiving channel. For this reason, the cooling water flows at a higher speed in the high heat receiving side flow path than in the low heat receiving side flow path. Therefore, the flow rate of the cooling water flowing through the cooling water flow path increases in the high heat receiving side flow path and decreases in the low heat receiving side flow path. Since the exhaust flow path portion on the low heat receiving side flow path side is inherently difficult to increase in temperature, the increase in temperature is prevented even if the cooling water flow rate decreases.

  For this reason, since the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  An internal combustion engine exhaust cooling system according to claim 2, wherein an exhaust cooling adapter for cooling the exhaust flowing through the exhaust passage by flowing the cooling water through a cooling water passage formed in a wall surrounding the exhaust passage is provided with a cylinder head. An exhaust cooling system for an internal combustion engine disposed between an exhaust port opened to the exhaust branch pipe and the exhaust cooling adapter, wherein the exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water flow path, and the cooling A cooling water discharge port for discharging cooling water to the outside from the water flow path, and the cooling water flow path is a curved outer flow path divided by a bent exhaust flow generated along with a curved shape of the exhaust port, An inner flow path, and two intermediate flow paths that connect the outer flow path and the inner flow path at both ends, and the cooling water discharge direction of the cooling water introduction port is the inside of one of the two intermediate flow paths. On the inner channel side The cooling water discharge port discharges the cooling water from a position where the other of the two intermediate flow paths and the outer flow path are connected or in the vicinity of this position. It is characterized by.

  In this internal combustion engine exhaust cooling system, in the exhaust cooling adapter, the cooling water discharged from the cooling water introduction port to the cooling water flow path immediately passes through one of the two intermediate flow paths from the inner flow path side to the outer flow path side. It will be.

  For this reason, the water flow of the cooling water discharged from the cooling water inlet is sufficiently transmitted to the outer flow path, and there is little transmission of the water flow to the inner flow path. Therefore, the cooling water flows through the outer flow path at a higher speed than the inner flow path, and the cooling water flow rate flowing through the cooling water flow path increases in the outer flow path and decreases in the inner flow path.

  Since the exhaust port has a curved shape, the exhaust flow is bent before the exhaust reaches the exhaust cooling adapter. For this reason, in the exhaust cooling adapter, the inner surface of the exhaust passage corresponding to the outside of the exhaust flow curve is likely to be heated due to high-speed exhaust flow or exhaust blow.

  In this internal combustion engine exhaust cooling system, as described above, the outer flow path, which is the cooling water flow path corresponding to the inner surface of the exhaust flow path that tends to increase in temperature, can have a higher coolant flow rate than the inner flow path. High temperature in the road can be prevented. The exhaust flow path portion corresponding to the inner flow path is inherently difficult to increase in temperature, so that the increase in temperature is prevented even if the cooling water flow rate is reduced.

  For this reason, since the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  An exhaust cooling system for an internal combustion engine according to claim 3, wherein an exhaust cooling adapter for cooling the exhaust flowing through the exhaust passage by flowing the cooling water through a cooling water passage formed in a wall surrounding the exhaust passage is provided in the cylinder head. An exhaust cooling system for an internal combustion engine disposed between an exhaust port opened to the exhaust branch pipe and the exhaust cooling adapter, wherein the exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water flow path, and the cooling A cooling water discharge port for discharging cooling water from the water flow path to the outside, and the cooling water flow path is formed by bending of the exhaust flow caused by the bent shape of the connection portion between the exhaust port and the exhaust flow path. A curved outer flow path, a curved inner flow path, and two intermediate flow paths connecting the outer flow path and the inner flow path at both ends, the cooling water discharge direction of the cooling water inlet is The two intermediate flow paths This is a direction in which one inside is directed from the inner flow path side to the outer flow path side, and the cooling water discharge port is located at or near the position where the other of the two intermediate flow paths and the outer flow path are connected. It is characterized by discharging cooling water.

  In this internal combustion engine exhaust cooling system, in the exhaust cooling adapter, the cooling water discharged from the cooling water introduction port to the cooling water flow path immediately passes through one of the two intermediate flow paths from the inner flow path side to the outer flow path side. It will be.

  For this reason, the water flow of the cooling water discharged from the cooling water inlet is sufficiently transmitted to the outer flow path, and there is little transmission of the water flow to the inner flow path. Therefore, the cooling water flows through the outer flow path at a higher speed than the inner flow path, and the cooling water flow rate flowing through the cooling water flow path increases in the outer flow path and decreases in the inner flow path.

  Since the exhaust port on the cylinder head side and the exhaust flow path of the exhaust cooling adapter are bent, the exhaust flow is bent when the exhaust reaches the exhaust cooling adapter. In FIG. 5, the inner surface of the exhaust passage corresponding to the outside of the exhaust flow curve tends to be heated due to the high-speed exhaust flow or exhaust blow.

  In this internal combustion engine exhaust cooling system, as described above, the outer flow path, which is the cooling water flow path corresponding to the inner surface of the exhaust flow path that tends to increase in temperature, can have a higher coolant flow rate than the inner flow path. High temperature in the road can be prevented. The exhaust flow path portion corresponding to the inner flow path is inherently difficult to increase in temperature, so that the increase in temperature is prevented even if the cooling water flow rate is reduced.

  For this reason, since the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  The internal combustion engine exhaust cooling system according to claim 4, wherein the cooling water discharge port is cooled in the same direction as a flow direction of the cooling water in the high heat receiving side flow path. It is formed as a flow path for discharging water.

  Since the cooling water discharge port is a flow path for discharging cooling water in the same direction as the flow direction of the cooling water in the high heat receiving side flow path, the cooling water that has flowed through the high heat receiving side flow path at high speed The flow direction does not change when it flows to the outlet. For this reason, since the flow resistance does not increase even when discharged from the cooling water flow path, it does not hinder the high-speed cooling water flow in the high heat receiving side flow path.

Therefore, since the cooling water flows more smoothly, the effect of suppressing the increase in the size of the exhaust cooling adapter and the load increase of the water flow pump can be further enhanced.
The internal combustion engine exhaust cooling system according to claim 5, wherein the cooling water discharge port is cooled in the same direction as a flow direction of the cooling water in the outer flow path. It is formed as a flow path for discharging water.

  The cooling water discharge port is a flow channel that discharges cooling water in the same direction as the flow direction of the cooling water in the outer flow channel, so that the cooling water that has flowed through the outer flow channel flows out to the cooling water discharge port. The flow direction does not change. For this reason, since the flow resistance does not increase even when discharged from the cooling water flow path, it does not hinder high-speed cooling water flow in the outer flow path.

Therefore, since the cooling water flows more smoothly, the effect of suppressing the increase in the size of the exhaust cooling adapter and the load increase of the water flow pump can be further enhanced.
In the internal combustion engine exhaust cooling system according to claim 6, in the internal combustion engine exhaust cooling system according to any one of claims 1 to 5, a plurality of the exhaust ports are arranged and opened in the cylinder head. The exhaust passage array is formed inside the exhaust cooling adapter, and the exhaust port is curved in a direction orthogonal to the arrangement direction, or the exhaust port and the exhaust passage Are bent and connected in a direction orthogonal to the arrangement direction.

  Thus, the exhaust port of the cylinder head and the exhaust flow path of the exhaust cooling adapter are arranged, and the exhaust port is curved in a direction orthogonal to the arrangement direction as described above, or the exhaust port and the exhaust flow path Are bent and connected in a direction perpendicular to the arrangement direction. In the case of such a configuration, as described above, a high heat receiving side flow path or outer flow path and a low heat receiving side flow path or inner flow path are formed along the arrangement direction.

  Therefore, as described above, the flow rate of the cooling water is increased on the side where the temperature tends to increase, and the flow rate of the cooling water is suppressed on the side where the temperature is difficult to increase, so the exhaust flow path of the exhaust cooling adapter can be reduced without increasing the total cooling water flow rate. Cooling can be performed efficiently, and the size of the exhaust cooling adapter and the burden on the water pump are not increased.

  In the internal combustion engine exhaust cooling system according to claim 7, in the internal combustion engine exhaust cooling system according to claim 1 or 4, a plurality of the exhaust ports are arranged and opened in a cylinder head, and the exhaust ports correspond to the arrangement. An array of the exhaust passages is formed inside the exhaust cooling adapter, and the exhaust ports are curved in a direction perpendicular to the arrangement direction, or the exhaust ports and the exhaust passages are arranged in the arrangement direction. Are bent and connected in a direction orthogonal to each other, and the cooling water inlet is connected to the high heat receiving side flow path from the low heat receiving side flow path via an intermediate flow path on one end side in the arrangement direction. The cooling water discharge port discharges the cooling water from a position where the intermediate flow path on the other end side in the arrangement direction and the high heat receiving flow path are connected, or from the vicinity of this position. To be discharged And butterflies.

  Thus, the exhaust port of the cylinder head and the exhaust flow path of the exhaust cooling adapter are arranged, and the exhaust port is curved in a direction orthogonal to the arrangement direction as described above, or the exhaust port and the exhaust flow path Are bent and connected in a direction perpendicular to the arrangement direction. In the case of such a configuration, as described above, the high heat receiving side flow path and the low heat receiving side flow path are generated along the arrangement direction.

  By arranging the cooling water inlet and the cooling water outlet as described above with respect to the high heat receiving side flow path and the low heat receiving side flow path, the cooling water flow rate can be reduced on the high heat receiving side flow path side where the temperature tends to increase. The cooling water flow rate can be suppressed on the low heat receiving side flow path side which is increased and is not easily heated. As a result, the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, and the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  In the internal combustion engine exhaust cooling system according to claim 8, in the internal combustion engine exhaust cooling system according to any one of claims 2, 3 and 5, a plurality of the exhaust ports are arranged and opened in the cylinder head, Corresponding to this arrangement, an array of the exhaust flow paths is formed inside the exhaust cooling adapter, and the exhaust ports are curved in a direction perpendicular to the arrangement direction, or the exhaust ports and the exhaust The flow path is bent and connected in a direction orthogonal to the arrangement direction, and the cooling water inlet is connected to the flow path from the inner flow path through an intermediate flow path on one end side in the arrangement direction. The cooling water is discharged toward the outer flow path, and the cooling water discharge port is provided at a position where the intermediate flow path on the other end side in the arrangement direction is connected to the outer flow path or from the vicinity of this position. Is to discharge And wherein the door.

  Thus, the exhaust port of the cylinder head and the exhaust flow path of the exhaust cooling adapter are arranged, and the exhaust port is curved in a direction orthogonal to the arrangement direction as described above, or the exhaust port and the exhaust flow path Are bent and connected in a direction perpendicular to the arrangement direction. In the case of such a configuration, the outer flow path and the inner flow path are generated along the arrangement direction as described above.

  By arranging the cooling water inlet and the cooling water outlet as described above with respect to such an outer channel and an inner channel, the cooling water flow rate is increased on the outer channel side where the temperature is likely to be increased, and the temperature is not easily increased. The cooling water flow rate can be suppressed on the inner flow path side. As a result, the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, and the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  10. The internal combustion engine exhaust cooling system according to claim 9, wherein the arrangement direction of the exhaust ports in the cylinder head is a horizontal direction, and the arrangement is described above. The direction orthogonal to the direction is a vertically downward direction.

  In this way, when the arrangement direction of the exhaust port of the cylinder head and the exhaust flow path of the exhaust cooling adapter is set and the bending direction of the exhaust flow is set, the arrangement direction is set in the exhaust cooling adapter. A cooling water flow rate is increased in a cooling water flow path (a high heat receiving side flow path or an outer flow path) provided vertically upward along the line. And a cooling water flow volume is suppressed in the cooling water flow path (low heat receiving side flow path or inner flow path) provided in the vertical direction along the arrangement direction. As a result, the exhaust flow path of the exhaust cooling adapter can be efficiently cooled without increasing the total cooling water flow rate, and the size of the exhaust cooling adapter and the burden on the water flow pump do not increase.

  In the internal combustion engine exhaust cooling system according to claim 10, the internal combustion engine exhaust cooling system according to any one of claims 1 to 9, wherein the cooling water flow path is provided in the cooling water flow path near the cooling water inlet. A flow direction guide for guiding the flow of the cooling water discharged from the water introduction port to one of the two intermediate flow paths is formed.

  In this way, the flow direction guide that leads to the corresponding intermediate flow path may be formed in the cooling water flow path, and the high heat reception side flow path and the high heat reception side flow path It becomes easy to appropriately divert the cooling water to the low heat receiving side flow path or to the outer flow path and the inner flow path.

1 is a longitudinal sectional view of an internal combustion engine exhaust cooling system of Embodiment 1. FIG. (A), (b) The perspective view of the adapter for exhaust cooling used for the said internal combustion engine exhaust cooling system. (A)-(c) Similarly structure explanatory drawing of the adapter for exhaust cooling. (A)-(c) Similarly structure explanatory drawing of the adapter for exhaust cooling. (A), (b) Space shape explanatory drawing of the water jacket in the adapter for exhaust cooling similarly. (A)-(c) Sectional drawing of the adapter for exhaust cooling used for the internal combustion engine exhaust cooling system of Embodiment 2. FIG. (A), (b) Sectional drawing of the adapter for exhaust cooling used for the internal combustion engine exhaust cooling system of other embodiment.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view showing a configuration of an exhaust cooling system 4 in an exhaust system of an internal combustion engine 2 to which the above-described invention is applied. The internal combustion engine 2 is a V-type 6-cylinder gasoline engine mounted on a vehicle, and includes two banks arranged on the left and right sides with a bank angle of 60 °. FIG. 1 shows the exhaust cooling system 4 on the right bank 6 side.

  Intake into the combustion chamber 6b in the cylinder 6a of the right bank 6 is introduced as an air-fuel mixture together with fuel from the intake system through the intake port 8 and the intake valve 10 in the intake stroke. This air-fuel mixture is compressed by the piston 6c in the compression stroke, and is ignited and burned by the spark plug 6d in the combustion stroke. Then, when the exhaust valve 12 is opened in the exhaust stroke, the gas in the combustion chamber 6b is exhausted to the exhaust system as exhaust. Similarly, the other two cylinders of the right bank 6 and the three cylinders of the left bank are exhausted to the exhaust system in the exhaust stroke.

  Here, the exhaust system on the right bank 6 side is connected to the cylinder head 14 at an exhaust port 16 formed in the cylinder head 14 (a total of three exhaust ports for all the cylinders in the right bank 6). The exhaust cooling adapter 18 and an exhaust branch pipe 20 connected to the exhaust cooling adapter 18 are provided. In addition, an exhaust purification catalyst and the like are provided downstream in the exhaust system on the right bank 6 side. Similarly, the exhaust system of the left bank is provided with a total of three exhaust ports formed in the cylinder head, an exhaust cooling adapter, and an exhaust branch pipe. The exhaust cooling adapter in the left bank has the same configuration as the exhaust cooling adapter 18 on the right bank 6 side in this embodiment, but the axial relationship with the exhaust port side, the mounting angle to the cylinder head, or Differences such as length and curved shape may be provided.

  The configuration of the exhaust cooling adapter 18 in the exhaust system of the right bank 6 is shown in FIGS. 2A is a perspective view seen from the exhaust inlet 22 side, FIG. 2B is a perspective view seen from the exhaust outlet 24 side, FIG. 3A is a plan view, and FIG. 4C is a bottom view, FIG. 4A is a left side view, FIG. 4B is a right side view, and FIG. 4C is a rear view. In FIG. 2, the space shape of the internal water jacket 34 is indicated by a broken line.

  As shown in FIG. 1, the exhaust cooling adapter 18 is disposed between the exhaust port 16 opening to the cylinder head 14 of the right bank 6 and the exhaust branch pipe 20 to cool the exhaust discharged from the exhaust port 16. The exhaust gas is discharged to the exhaust branch pipe 20 side, thereby preventing thermal damage in the exhaust system of the right bank 6.

  Such an exhaust cooling adapter 18 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 28 in which an exhaust introduction port 22 opens on the exhaust upstream side. . Three exhaust inlets 22 are arranged in a straight line corresponding to the position and number of exhaust ports 16 in the cylinder head 14 of the right bank 6.

On the exhaust downstream side, an exhaust branch pipe side connection surface 30 in which an exhaust discharge port 24 opens is formed. Three exhaust outlets 24 are provided in a linear arrangement corresponding to the exhaust inlet 22.
The exhaust inlet 22 and the exhaust outlet 24 are connected to each other by three exhaust passages 32 formed in the exhaust cooling adapter 18.

  The exhaust cooling adapter 18 is formed with a bolt fastening portion 28 a for fastening the exhaust cooling adapter 18 itself to the adapter connection surface 14 a on the cylinder head 14 side at the periphery of the cylinder head side connection surface 28. . An exhaust cooling adapter is formed by inserting a bolt into the bolt insertion hole 28b formed in the bolt fastening portion 28a and screwing it into a screwing hole opened in the adapter connection surface 14a on the cylinder head 14 side. 18 is fixed to the cylinder head 14. Thus, the exhaust port 16 on the cylinder head 14 side and the exhaust flow path 32 on the exhaust cooling adapter 18 side can be connected.

  Further, the exhaust cooling adapter 18 is formed with a bolt fastening portion 30 a for fastening the exhaust branch pipe 20 with a bolt at the periphery of the exhaust branch pipe side connection surface 30. A screw fastening hole 30b is formed in the bolt fastening portion 30a, and the exhaust branch pipe 20 is connected by screwing a bolt through an insertion hole formed in the flange 20a on the exhaust branch pipe 20 side. . Thus, the exhaust flow path 32 on the exhaust cooling adapter 18 side and the exhaust flow path 20b on the exhaust branch pipe 20 side can be connected.

A water jacket 34 is formed around the exhaust passage 32 in the wall of the exhaust cooling adapter 18 attached to the internal combustion engine 2 in this way.
FIG. 5 shows the space shape of the water jacket 34 in the exhaust cooling adapter 18. 5A is a perspective view seen from the exhaust inlet 22 side, and b is a perspective view seen from the exhaust outlet 24 side.

  As shown in FIGS. 2 to 4, the exhaust cooling adapter 18 is provided with a cooling water introduction portion 36 in the water jacket 34 at the lower side in the vertical direction and a cooling water discharge portion 38 at the upper side in the vertical direction.

  Cooling water is introduced into the water jacket 34 from a cooling water introduction port 36a formed in the cooling water introduction part 36 and flows through the water jacket 34 as indicated by an arrow in FIG. It is discharged to an external cooling water recirculation path through a cooling water discharge port 38a formed in the discharge portion 38.

  As a result, the amount of heat transmitted from the high-temperature exhaust gas via the inner peripheral surfaces 32a and 32b (FIG. 1) of the exhaust flow channel 32 flows through the cooling water flow channels 34a, 34b, 34c, 34d, and 34e of the water jacket 34. The exhaust is cooled by being absorbed by the cooling water, and the exhaust after cooling is sent to the exhaust branch pipe 20 side.

  Here, as indicated by a one-dot chain line in FIG. 1, the axis X1 of the exhaust port 16 and the axis X2 of the exhaust passage 32 have an angle θ. In some cases, the axes X1 and X2 do not cross each other but are in a non-crossing state and a non-parallel state corresponding to an angle θ.

  In the present embodiment, the axis X2 of the exhaust passage 32 is bent downward in the vertical direction with respect to the axis X1 of the exhaust port 16 at an angle θ. For this reason, the inner peripheral surface 32 a vertically above the exhaust flow path 32 forms a region that is inclined obliquely so as to face the exhaust port 16. The inner peripheral surface 32 b below the vertical direction is not a region that faces obliquely so as to face the exhaust port 16, but faces the opposite direction without facing the exhaust port 16.

  As described above, since the inner peripheral surface 32a in the vertical direction in the exhaust passage 32 is shaped toward the exhaust port 16, the exhaust introduced into the exhaust passage 32 of the exhaust cooling adapter 18 from the exhaust port 16 is Compared with the inner peripheral surface 32b below the vertical direction, it blows strongly against the inner peripheral surface 32a above the vertical direction.

  Moreover, the exhaust port 16 reaches the exhaust cooling adapter 18 in a curved shape from the combustion chamber 6b, and the upper part in the vertical direction is the outside of the curve. For this reason, since the hot exhaust gas flows at a high speed on the inner peripheral surface 32a vertically above the inner peripheral surface 32b below the vertical direction, the hot exhaust gas blows against the inner peripheral surface 32a above the vertical direction. strong. For this reason, the amount of heat received increases particularly on the inner peripheral surface 32a in the upper vertical direction. That is, the inner peripheral surface 32a above the vertical direction is the high heat receiving side, and the inner peripheral surface 32b below the vertical direction is the low heat receiving side.

In such a flow state, the high-temperature exhaust heat is transferred to the inner peripheral surfaces 32a and 32b, the exhaust itself is cooled, and flows out to the exhaust flow path 20b on the exhaust branch pipe 20 side.
Here, in the water jacket 34, as described above, the cooling water introduction port 36a of the cooling water introduction portion 36 provided below in the vertical direction is located at the introduction position of the cooling water flow path 34b below the vertical direction and the cooling water flow above the vertical direction. A cooling water passage 34d that connects the passage 34a to one end side in the arrangement direction of the exhaust passage 32. Also in this cooling water flow path 34d, the position close to the cooling water flow path 34b below in the vertical direction is the cooling water introduction position. From the position on the cooling water flow path 34b side below the vertical direction, the cooling water introduction port 36a discharges the cooling water toward the cooling water flow path 34a on the upper side in the vertical direction.

  That is, the cooling water discharge direction from the cooling water introduction port 36 a is downward in the vertical direction, which is the inner flow path of the exhaust flow curve accompanying the curvature of the exhaust port 16, inside the cooling water flow path 34 d that is one of the intermediate flow paths. The cooling water flow path 34b is directed to the cooling water flow path 34a on the upper side in the vertical direction, which is the outer flow path of the exhaust flow.

  Further, the direction of cooling water discharge from the cooling water inlet 36a is the bending of the exhaust flow caused by the bending of the connection between the exhaust port 16 and the exhaust flow path 32 inside the cooling water flow path 34d, which is one of the intermediate flow paths. It is also a direction which goes from the cooling water flow path 34b side below the vertical direction which is the inner flow path to the cooling water flow path 34a side above the vertical direction which is the outer flow path of the exhaust flow.

Therefore, compared with the cooling water channel 34b that is the inner channel, the cooling water channel 34a that is the outer channel flows the cooling water at a higher speed.
According to the first embodiment described above, the following effects can be obtained.

  (1) As described above, the exhaust port 16 is curved in a direction orthogonal to the arrangement direction. Furthermore, the connection portion between the exhaust port 16 and the exhaust flow path 32 of the exhaust cooling adapter 18 connected to the exhaust port 16 is bent in a direction perpendicular to the arrangement direction. Both the curved state and the bent state are bent downward in the vertical direction, and accordingly, the exhaust flow is bent in the direction perpendicular to the arrangement direction and downward in the vertical direction.

  Due to such bending of the exhaust flow, in the exhaust cooling adapter 18, the cooling water passage 34 a formed along the arrangement direction and arranged vertically above the inner circumference of the exhaust passage 32 on the high heat receiving side. This corresponds to the high heat receiving side channel and the outer channel corresponding to the surface 32a. The cooling water flow path 34b formed along the arrangement direction and disposed below the vertical direction corresponds to a low heat receiving side flow path and an internal flow path corresponding to the low heat receiving side inner peripheral surface 32b of the exhaust flow path 32. Will do. The two cooling water channels 34d and 34e that connect the cooling water channels 34a and 34b at both ends correspond to intermediate channels.

  In such an exhaust cooling adapter 18, the flow direction of the cooling water discharged from the cooling water inlet 36 a into the water jacket 34 is directed toward the cooling water flow path 34 a. Therefore, as indicated by the arrow in FIG. 5, the main flow of the cooling water cools the inside of one of the two intermediate flow paths (cooling water flow paths 34d and 34e) from the cooling water flow path 34b side. It goes to the water flow path 34a side. Therefore, the coolant flow rate toward the coolant channel 34b is small.

  For this reason, the water flow of the cooling water discharged from the cooling water introduction port 36a is sufficiently transmitted to the cooling water flow channel 34a, and there is little transmission of the water flow to the cooling water flow channel 34b. Therefore, the cooling water flows at a higher speed in the cooling water flow path 34a than in the cooling water flow path 34b. As a result, the flow rate of the cooling water flowing through the water jacket 34 increases in the cooling water flow path 34a and decreases in the cooling water flow path 34b. Can be prevented. Therefore, the boiling resistance in the cooling water flow path 34a by heat transfer from the inner peripheral surface 32a can also be improved.

Since the inner peripheral surface 32b in the lower vertical direction is inherently difficult to increase in temperature, the increase in temperature can be prevented even if the cooling water flow rate in the corresponding cooling water flow path 34b decreases.
As described above, the exhaust flow path 32 of the exhaust cooling adapter 18 can be efficiently cooled without increasing the total cooling water flow rate flowing to the water jacket 34, so that the size of the exhaust cooling adapter 18 and the burden of the water flow pump are reduced. There is no increase.

  (2) The cooling water discharge port 38a is a flow path for discharging cooling water in the same direction as the flow direction of the cooling water in the cooling water flow path 34a. Therefore, as indicated by the arrow in FIG. 5, the cooling water flowing at high speed through the cooling water flow path 34a does not change the flow direction when flowing out to the cooling water discharge port 38a. For this reason, the flow resistance does not increase even when the cooling water flow path 34a exits to the outside, so that the high-speed cooling water flow in the cooling water flow path 34a is not hindered.

Therefore, since the cooling water flows more smoothly, the effect of suppressing the increase in the size of the exhaust cooling adapter 18 and the increase in the load on the water pump can be further enhanced.
[Embodiment 2]
Exhaust cooling adapters 118, 218, and 318 used in the exhaust cooling system of the present embodiment are shown in the sectional view of FIG. Other configurations of the exhaust cooling system are the same as those in the first embodiment.

  In the exhaust cooling adapter 118 shown in FIG. 6A, the cooling water inlet 136 a of the cooling water introducing portion 136 that introduces cooling water into the water jacket 134 is vertically downward along the arrangement direction of the exhaust flow paths 132. The cooling water flow path 134b (corresponding to the low heat receiving side flow path and the inner flow path) disposed in the is opened, and the cooling water is discharged through the cooling water flow path 134b.

  A flow direction guide 136b is formed on the opposite side of the cooling water flow path 134d (corresponding to the intermediate flow path) at the edge of the portion of the cooling water inlet 136a that opens to the cooling water flow path 134b. The front end of the flow direction guide 136b faces the cooling water flow path 134d. Therefore, the cooling water introduced from the cooling water inlet 136a into the cooling water flow path 134b is directed toward the cooling water flow path 134d by the flow direction guide 136b.

  As a result, as shown by the arrow in the figure, the main flow of the cooling water becomes a water flow toward the cooling water flow path 134d, and the flow rate becomes large. In the cooling water flow path 134b, the flow rate toward the cooling water flow path 134e, which is the opposite intermediate flow path, is reduced.

  The water flow in the cooling water flow path 134d remains as it is in the cooling water flow path 134a (corresponding to the high heat receiving side flow path and the outer flow path) arranged vertically above the arrangement direction of the exhaust flow paths 132. And flows to the cooling water discharge part 138.

  And since the direction of the cooling water discharge port 138a of the cooling water discharge part 138 is the same direction as the cooling water flow path 134a, the cooling water also flows in the cooling water discharge port 138a without reducing the water force, It is discharged to the outside from the discharge port 138a.

  In the exhaust cooling adapter 218 shown in FIG. 6B, the cooling water introduction port 236a of the cooling water introduction part 236 that introduces the cooling water into the water jacket 234 has an exhaust flow path as in FIG. The cooling water is discharged into the cooling water flow path 234b (corresponding to the low heat receiving flow path and the inner flow path) arranged vertically below the 232 arrangement direction.

  However, in the example of FIG. 6B, the flow direction guide 236b is formed not on the edge portion of the cooling water inlet 236a but on the wall portion side of the opposed exhaust flow path 232. The front end of the flow direction guide 236b is formed toward the edge opposite to the cooling water flow path 234d (corresponding to the intermediate flow path) in the edge of the cooling water inlet 236a.

Therefore, the cooling water introduced from the cooling water inlet 236a into the cooling water channel 234b is directed toward the cooling water channel 234d by the slope of the flow direction guide 236b.
As a result, as shown by the arrow in the figure, the main flow of the cooling water becomes a water flow toward the cooling water flow path 234d, and the flow rate becomes large. In the cooling water channel 234b, the flow rate to the cooling water channel 234e, which is the opposite intermediate channel, is reduced.

  The water flow in the cooling water flow path 234d remains as it is in the cooling water flow path 234a (corresponding to the high heat receiving side flow path and the outer flow path) arranged vertically above the arrangement direction of the exhaust flow paths 232. And flows to the cooling water discharge part 238.

  And since the direction of the cooling water discharge port 238a of the cooling water discharge part 238 is the same direction as the cooling water flow path 234a, the cooling water flows without reducing the water force and is discharged from the cooling water discharge port 238a as it is. The

  In the exhaust cooling adapter 318 shown in FIG. 6C, the cooling water introduction port 336 a of the cooling water introduction part 336 that introduces the cooling water into the water jacket 334 is vertically downward along the arrangement direction of the exhaust flow paths 332. The cooling water channel 334b (corresponding to the low heat-receiving side channel and the inner channel) disposed in is opened to discharge the cooling water. This is the same as (a) of FIG.

  However, the cooling water introduction port 336a of the cooling water introduction part 336 is farther from the cooling water flow path 334d (corresponding to the intermediate flow path) than the (a) of FIG. 6, and the cooling water flow path 334a (high heat receiving side flow path) And the outer flow path) and the cooling water flow path 334b at a central portion of the cooling water flow path 334c. Accordingly, the flow direction guide 336b formed at the opening edge of the cooling water inlet 336a on the side opposite to the cooling water flow path 334d (corresponding to the intermediate flow path) is formed longer toward the cooling water flow path 334d. It is ensured that a sufficient water flow of the cooling water reaches the cooling water flow path 334d.

  As a result, as shown by the arrow in the figure, the main flow of the cooling water becomes a water flow toward the cooling water flow path 334d, and the flow rate becomes large. In the cooling water channel 334b, the flow rate to the cooling water channel 334e, which is the opposite intermediate channel, is reduced.

  The water flow in the cooling water flow path 334d remains as it is in the cooling water flow path 334a disposed vertically above the arrangement direction of the exhaust flow paths 332 and flows to the cooling water discharge portion 338.

  And since the direction of the cooling water discharge port 338a of the cooling water discharge part 338 is the same direction as the cooling water flow path 334a, the cooling water flows without reducing the water force and is discharged from the cooling water discharge port 338a as it is. The

According to the second embodiment described above, the following effects can be obtained.
(1) As described above, even if the cooling water introduction portions 136, 236, and 336 are attached to the cooling water flow paths 134b, 234b, and 334b, the main flow of the cooling water is cooled by the flow direction guides 136b, 236b, and 336b. , 334d to the cooling water flow paths 134a, 234a, 334a.

As a result, the effects as described in the first embodiment can be produced.
[Other embodiments]
When the cooling water inlet 436a of the cooling water inlet 436 is connected to the cooling water passage 434b corresponding to the low heat receiving side passage and the inner passage, like the exhaust cooling adapter 418 shown in FIG. Instead of using the flow direction guide, the cooling water inlet 436a may be formed to be inclined so that the main flow of the cooling water faces the cooling water flow path 434d that is an intermediate flow path.

  As a result, as shown by the arrow in the figure, the water flow in the cooling water flow path 434d is directly changed to flow in the cooling water flow path 434a corresponding to the high heat receiving side flow path and the outer flow path, and flows to the cooling water discharge portion 438. Then, the cooling water flows without reducing the water flow, and is directly discharged from the cooling water discharge port 438a. Also by this, the effect of the first embodiment can be produced.

  -In each of the above embodiments, the direction of the cooling water discharge port of the cooling water discharge part is along the cooling water flow direction in the cooling water flow path corresponding to the high heat receiving side flow path and the outer flow path, As shown in FIG. 7B, the direction of the cooling water discharge port 538a of the cooling water discharge portion 538 may be different from the direction of the cooling water flow in the cooling water flow path 534a corresponding to the high heat receiving side flow path and the outer flow path. good. In the example of FIG. 7B, the direction of the cooling water discharge port 538a is a direction orthogonal to the cooling water flow direction in the cooling water flow path 534a. Also by this, the water flow of the cooling water discharged from the cooling water introduction port 536a of the cooling water introduction part 536 is transmitted to the cooling water flow path 534a via the cooling water flow path 534d as an intermediate flow path. A sufficiently large amount of cooling water flow can be secured in the water channel 534a. As a result, the effect (1) of the first embodiment can be produced.

  -Even if the exhaust port and the exhaust flow path of the exhaust cooling adapter are not bent and only the exhaust port is curved, the inner peripheral surface of the curved outer side of the exhaust flow path of the exhaust cooling adapter becomes the high heat receiving side, The cooling water flow path corresponding to this inner peripheral surface becomes a high heat receiving side flow path. Therefore, the effect mentioned above can be produced by flowing cooling water as in the above embodiments.

  Even when the connection part between the exhaust port and the exhaust flow path of the exhaust cooling adapter is only bent, the inner peripheral surface of the bent outer side of the exhaust flow path of the exhaust cooling adapter becomes the high heat receiving side. The cooling water flow path corresponding to the peripheral surface is the high heat receiving side flow path. Therefore, the effect mentioned above can be produced by flowing cooling water as in the above embodiments.

  FIG. 1 shows an example in which the present invention is applied to a V-type 6-cylinder internal combustion engine, but it may be an in-line type and can be applied to other cylinders other than 6 cylinders such as 4 cylinders and 8 cylinders.

  DESCRIPTION OF SYMBOLS 2 ... Internal combustion engine, 4 ... Exhaust cooling system, 6 ... Right bank, 6a ... Cylinder, 6b ... Combustion chamber, 6c ... Piston, 6d ... Spark plug, 8 ... Intake port, 10 ... Intake valve, 12 ... Exhaust valve, 14 DESCRIPTION OF SYMBOLS ... Cylinder head, 14a ... Adapter connection surface, 16 ... Exhaust port, 18 ... Exhaust cooling adapter, 20 ... Exhaust branch pipe, 20a ... Flange, 20b ... Exhaust flow path, 22 ... Exhaust inlet, 24 ... Exhaust outlet, 28 ... Cylinder head side connection surface, 28a ... Bolt fastening portion, 28b ... Bolt insertion hole, 30 ... Exhaust branch pipe side connection surface, 30a ... Bolt fastening portion, 30b ... Screw hole, 32 ... Exhaust flow path, 32a, 32b ... inner peripheral surface, 34 ... water jacket, 34a, 34b, 34c, 34d, 34e ... cooling water flow path, 36 ... cooling water introduction part, 36a ... cooling water introduction port, 38 ... cooling water discharge part, 38a ... cooling water Outlet, 118 ... Exhaust cooling adapter, 132 ... Exhaust flow path, 134 ... Water jacket, 134a, 134b, 134d, 134e ... Cooling water flow path, 136 ... Cooling water inlet, 136a ... Cooling water inlet, 136b ... Flow direction Guide, 138 ... Cooling water discharge part, 138a ... Cooling water discharge port, 218 ... Exhaust cooling adapter, 232 ... Exhaust flow path, 234 ... Water jacket, 234a, 234b, 234d, 234e ... Cooling water flow path, 236 ... Cooling water Introduction part, 236a ... Cooling water introduction port, 236b ... Flow direction guide, 238 ... Cooling water discharge part, 238a ... Cooling water discharge port, 318 ... Exhaust cooling adapter, 332 ... Exhaust flow path, 334 ... Water jacket, 334a, 334b, 334c, 334d, 334e ... cooling water flow path, 336 ... cooling water introduction part, 336a ... cold Water inlet, 336b ... Flow direction guide, 338 ... Cooling water outlet, 338a ... Cooling water outlet, 418 ... Exhaust cooling adapter, 434a, 434b, 434d ... Cooling water channel, 436 ... Cooling water inlet, 436a ... Cooling water inlet, 438 ... cooling water outlet, 438a ... cooling water outlet, 534a, 534d ... cooling water channel, 536 ... cooling water inlet, 536a ... cooling water inlet, 538 ... cooling water outlet, 538a ... Cooling water outlet, X1, X2 ... axis.

Claims (10)

  1. An exhaust cooling adapter that cools the exhaust flowing through the exhaust flow path by flowing the cooling water through the cooling water flow path formed in the wall surrounding the exhaust flow path is provided between the exhaust port that opens in the cylinder head and the exhaust branch pipe. An exhaust cooling system for an internal combustion engine arranged,
    The exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water passage, and a cooling water outlet for discharging cooling water from the cooling water passage to the outside.
    The cooling water flow path is divided into a high heat receiving side flow path, a low heat receiving side flow path, and these high heat receiving side flow paths, which are divided in accordance with a deviation in the amount of heat received from the exhaust in the circumferential direction of the inner surface of the exhaust flow path Two intermediate flow paths that connect the low heat receiving flow path at both ends,
    The cooling water discharge direction of the cooling water introduction port is a direction in which one of the two intermediate flow paths is directed from the low heat receiving side flow path side to the high heat receiving side flow path side,
    The exhaust cooling system for an internal combustion engine, wherein the cooling water discharge port discharges cooling water from a position where the other of the two intermediate flow paths and the high heat receiving flow path are connected or in the vicinity thereof. .
  2. An exhaust cooling adapter that cools the exhaust flowing through the exhaust flow path by flowing the cooling water through the cooling water flow path formed in the wall surrounding the exhaust flow path is provided between the exhaust port that opens in the cylinder head and the exhaust branch pipe. An exhaust cooling system for an internal combustion engine arranged,
    The exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water passage, and a cooling water outlet for discharging cooling water from the cooling water passage to the outside.
    The cooling water flow path is connected to both ends of the curved outer flow path, the curved inner flow path, and the outer flow path and the inner flow path, which are divided by the bending of the exhaust flow generated along with the curved shape of the exhaust port. With two intermediate flow paths
    The cooling water discharge direction of the cooling water introduction port is a direction in which one inside of the two intermediate flow paths is directed from the inner flow path side to the outer flow path side,
    The internal combustion engine exhaust cooling system, wherein the cooling water discharge port discharges cooling water from a position where the other of the two intermediate flow paths and the outer flow path are connected or in the vicinity thereof.
  3. An exhaust cooling adapter that cools the exhaust flowing through the exhaust flow path by flowing the cooling water through the cooling water flow path formed in the wall surrounding the exhaust flow path is provided between the exhaust port that opens in the cylinder head and the exhaust branch pipe. An exhaust cooling system for an internal combustion engine arranged,
    The exhaust cooling adapter includes a cooling water inlet for introducing cooling water into the cooling water passage, and a cooling water outlet for discharging cooling water from the cooling water passage to the outside.
    The cooling water flow path includes a curved outer flow path, a curved inner flow path, and outer sides thereof, which are divided by a bent exhaust flow generated in accordance with a bent shape of a connection portion between the exhaust port and the exhaust flow path. Two intermediate flow paths connecting the flow path and the inner flow path at both ends,
    The cooling water discharge direction of the cooling water introduction port is a direction in which one inside of the two intermediate flow paths is directed from the inner flow path side to the outer flow path side,
    The internal combustion engine exhaust cooling system, wherein the cooling water discharge port discharges cooling water from a position where the other of the two intermediate flow paths and the outer flow path are connected or in the vicinity thereof.
  4. 2. The internal combustion engine exhaust cooling system according to claim 1, wherein the cooling water discharge port is formed as a flow path for discharging cooling water in the same direction as a flow direction of the cooling water in the high heat receiving side flow path. An internal combustion engine exhaust cooling system.
  5. The internal combustion engine exhaust cooling system according to claim 2 or 3, wherein the cooling water discharge port is formed as a flow path for discharging cooling water in the same direction as the flow direction of the cooling water in the outer flow path. An internal combustion engine exhaust cooling system.
  6. The internal combustion engine exhaust cooling system according to any one of claims 1 to 5, wherein a plurality of the exhaust ports are arranged and opened in a cylinder head, and the exhaust cooling adapter is arranged inside the exhaust cooling adapter corresponding to the arrangement. An array of exhaust channels is formed,
    The exhaust port is formed to be bent in a direction orthogonal to the arrangement direction, or the exhaust port and the exhaust flow path are bent and connected in a direction orthogonal to the arrangement direction. An internal combustion engine exhaust cooling system.
  7. 5. The internal combustion engine exhaust cooling system according to claim 1, wherein a plurality of the exhaust ports are arranged in the cylinder head and open, and the exhaust flow path is arranged inside the exhaust cooling adapter corresponding to the arrangement. Formed,
    The exhaust port is curved and formed in a direction orthogonal to the arrangement direction, or the exhaust port and the exhaust flow path are bent and connected in a direction orthogonal to the arrangement direction,
    The cooling water introduction port is for discharging cooling water from the low heat receiving side flow path toward the high heat receiving side flow path through the intermediate flow path on one end side in the arrangement direction.
    The cooling water discharge port discharges cooling water from a position where the intermediate flow path on the other end side in the arrangement direction and the high heat receiving flow path are connected to each other or in the vicinity of this position. Exhaust cooling system.
  8. The internal combustion engine exhaust cooling system according to any one of claims 2, 3 and 5, wherein a plurality of the exhaust ports are arranged in the cylinder head and open, and the interior of the exhaust cooling adapter corresponding to the arrangement. An array of exhaust passages is formed in
    The exhaust port is curved and formed in a direction orthogonal to the arrangement direction, or the exhaust port and the exhaust flow path are bent and connected in a direction orthogonal to the arrangement direction,
    The cooling water introduction port discharges cooling water from the inner flow path toward the outer flow path through an intermediate flow path on one end side in the arrangement direction.
    The cooling water discharge port discharges cooling water from a position where the intermediate flow path on the other end side in the arrangement direction and the outer flow path are connected or in the vicinity of this position. system.
  9. The internal combustion engine exhaust cooling system according to any one of claims 6 to 8, wherein an arrangement direction of the exhaust ports in the cylinder head is a horizontal direction, and a direction orthogonal to the arrangement direction is a vertically downward direction. An internal combustion engine exhaust cooling system.
  10. The internal combustion engine exhaust cooling system according to any one of claims 1 to 9, wherein a cooling water flow discharged from the cooling water inlet is provided in the cooling water flow path in the vicinity of the cooling water inlet. An exhaust cooling system for an internal combustion engine, characterized in that a flow direction guide for guiding to one of the two intermediate flow paths is formed.
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US13/053,930 US20110232275A1 (en) 2010-03-23 2011-03-22 Internal combustion engine exhaust cooling system
CN 201110076947 CN102200046B (en) 2010-03-23 2011-03-23 Internal combustion engine exhaust cooling system

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CN102200046B (en) 2014-08-20
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JP2011196351A (en) 2011-10-06

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