JP6327059B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine, and more particularly to an internal combustion engine in which an oil cooler is attached to a cylinder block.

  In general, an internal combustion engine is provided with oil for lubricating between a piston and a cylinder provided between the internal combustion engine and between a crankshaft and a crankshaft bearing. This oil has a low viscosity at a high temperature and lowers the lubricity of the lubrication site. Therefore, the oil is cooled by an oil cooler to increase the viscosity of the oil.

  Since this oil cooler is equipped with an oil pipe separate from the internal combustion engine and a cooling water pipe surrounding the oil pipe, the layout around the internal combustion engine is restricted, and the increase in the number of parts causes an increase in weight and cost. In order to solve these problems, an internal combustion engine is known in which an oil cooler is directly attached to a cylinder block (see, for example, Patent Document 1).

  This internal combustion engine communicates with an outer wall surface of a cylinder block in a main gallery that is orthogonal to the cylinder arrangement direction, an oil outlet that discharges oil to the main gallery, and an oil that surrounds the discharge hole and introduces oil into an oil cooler. A reservoir, a cooling water supply channel and a drain channel formed above the oil reservoir are provided.

  The oil cooler attached to the cylinder block includes an oil supply hole communicating with the oil reservoir, an oil supply hole communicating with the oil discharge port, a water supply path communicating with the water supply path, and a drainage path communicating with the drainage path. Yes.

Japanese Utility Model Publication No. 5-47340 JP 2006-9697 A

  However, in the conventional oil cooler, an oil reservoir is formed around the oil discharge port formed on the outer wall surface of the cylinder block, and a cooling water supply channel and a drain channel are formed above the oil reservoir. Has been.

  For this reason, in the direction in which the main gallery extends, the structure of the oil passage and the cooling water passage with respect to the outer wall surface of the cylinder block becomes large, and the oil cooler may be enlarged accordingly.

  As another conventional internal combustion engine, a catalytic converter for purifying exhaust gas is attached to a cylinder block so as to overlap in a direction orthogonal to a main gallery and a direction in which cylinders are arranged (see, for example, Patent Document 2).

  Therefore, when the oil cooler described in Patent Document 1 is attached to the outer wall surface of the cylinder block so as to overlap in the direction orthogonal to the main gallery and the arrangement direction of the cylinders, the catalyst is installed in order to install the oil cooler. There is a risk that sufficient space on the side of the converter cannot be secured.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an internal combustion engine that can sufficiently secure a space for installing an oil cooler in the space of the engine body on the side of the catalytic converter. It is what.

  A first aspect of the present invention includes a main gallery that extends in the arrangement direction of the cylinders and supplies oil to a lubrication site, a first oil passage that is supplied with oil from an oil supply source, and a supply that is supplied from the first oil passage. The engine main body having a second oil passage for introducing the oil to be supplied to the main gallery and a first cooling water passage to which cooling water is supplied from the water jacket, and attached to the engine main body to purify the exhaust gas The catalytic converter is attached to the side of the catalytic converter in the direction in which the main gallery extends, and communicates with the first oil passage and the third oil passage and the first cooling water passage. An oil cooler having a second cooling water passage and performing heat exchange between the oil flowing through the third oil passage and the cooling water flowing through the second cooling water passage; An internal combustion engine having an oil introduction hole formed in a position overlapping with a part of the main gallery in a direction perpendicular to the arrangement direction of the cylinders, the oil passage being opened in an outer wall surface of the engine body, wherein the first cooling water The passage is separated from the main gallery upward or downward by a cooling water discharge hole that opens to the outer wall surface of the engine body, and a protrusion that protrudes from the outer wall surface of the engine body so as to extend in the vertical direction of the engine body. A guide groove that is surrounded and communicated with the cooling water discharge hole, the end of the guide groove extends from the cooling water discharge hole to the main gallery, and the end of the guide groove has a convex portion in the extending direction of the main gallery. Through the oil introduction hole.

  As described above, according to the first aspect, the oil cooler is attached to the side of the catalytic converter, and the first cooling water passage formed in the outer wall surface of the engine body is above or below the main gallery. A cooling water discharge hole that opens to the outer wall surface of the engine body and is spaced apart by a projection that protrudes from the outer wall surface of the engine body so as to extend in the vertical direction of the engine body and communicates with the cooling water discharge hole The end of the guide groove extends from the cooling water discharge hole to the main gallery, and the end of the guide groove is adjacent to the oil introduction hole via the convex portion in the direction in which the main gallery extends.

  As a result, the end portion of the guide groove communicating with the second cooling water passage of the oil cooler and the oil introduction hole can be brought close to each other in the direction in which the main gallery extends. For this reason, the length of the extending direction of the main gallery of the oil cooler attached to the outer wall surface of the engine body can be shortened. Therefore, a sufficient space for installing the oil cooler can be secured in the space of the engine body on the side of the catalytic converter.

FIG. 1 is a view showing an embodiment of an internal combustion engine of the present invention, and is a front view of the engine. FIG. 2 is a diagram showing an embodiment of the internal combustion engine of the present invention, and is a front view of the engine with a supercharger and a catalytic converter removed. FIG. 3 is a view showing an embodiment of the internal combustion engine of the present invention, and is a perspective view of the engine as viewed from below. 4 is a view showing an embodiment of the internal combustion engine of the present invention, and is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a view showing an embodiment of the internal combustion engine of the present invention, and is a cross-sectional view taken along line VV in FIG. FIG. 6 is a view showing an embodiment of the internal combustion engine of the present invention, and is a longitudinal sectional view of the engine. FIG. 7 is a diagram showing an embodiment of the internal combustion engine of the present invention, and is a front view of the engine showing the periphery of a cooling water discharge hole and a guide groove. FIG. 8 is a view showing an embodiment of the internal combustion engine of the present invention, and is an enlarged view of a cooling water discharge hole and a guide groove. FIG. 9 is a view showing an embodiment of the internal combustion engine of the present invention, and is an external view of an oil cooler.

Embodiments of an internal combustion engine according to the present invention will be described below with reference to the drawings.
1 to 9 are views showing an internal combustion engine according to an embodiment of the present invention.
First, the configuration will be described.
In FIG. 1, an engine 2 as an internal combustion engine mounted on a vehicle 1 such as an automobile includes a cylinder block 3. A cylinder head 4 is provided above the cylinder block 3, and an oil pan 5 in which oil is stored is provided below the cylinder block 3 (see FIG. 2). Here, the cylinder block 3 and the cylinder head 4 constitute an engine body of the present invention.

  In FIG. 3, the cylinder block 3 is provided with a plurality of cylinders 6 along the vehicle width direction. As shown in FIG. 6, a piston 3A is provided inside the cylinder 6 so as to be capable of reciprocating. The piston 3A is connected to the crankshaft 3C via the connecting rod 3B, and the reciprocating motion of the piston 3A is converted into the rotational motion of the crankshaft 3C via the connecting rod 3B.

  In FIG. 1, a supercharger 7 is provided on the front surface of the cylinder head 4. In FIG. 4, an exhaust port 4A is formed in the cylinder head 4, and the exhaust gas burned in the combustion chamber 4B formed in the bottom surface of the cylinder head 4 is introduced into the supercharger 7 through the exhaust port 4A. Is done.

  In FIG. 1, a supercharger 7 includes a turbine housing 7A that houses a turbine (not shown) and a compressor housing 7B that houses a compressor (not shown). The turbine and the compressor are connected by a rotating shaft that constitutes a lubrication site. Yes. A catalytic converter 8 is attached to the turbine housing 7A. The catalytic converter 8 purifies the exhaust gas introduced from the turbine housing 7A and then discharges it to an exhaust pipe (not shown).

  An intake pipe (not shown) is connected to the compressor housing 7B. The supercharger 7 compresses the intake air by a compressor that rotates at the same rotational speed as the turbine that rotates due to the pressure of the exhaust gas, and sends the compressed air to the cylinder 6 via the intake port 4C (see FIG. 4) of the cylinder head 4. .

2 and 5, an oil filter 9 is provided on the front surface of the oil pan 5, and the oil filter 9 purifies the oil pumped up from the oil pan 5 by an oil pump (not shown). Here, the oil pan 5 and the oil filter 9 constitute an oil supply source of the present invention.
A sub gallery 10 is formed on the front surface of the cylinder block 3, and the oil purified by the oil filter 9 is introduced into the sub gallery 10 by an oil pump.

  3, 5, and 6, a main gallery 11 through which oil flows is formed in the cylinder block 3, and the main gallery 11 extends in the arrangement direction of the cylinders 6 (the vehicle width direction in FIG. 3). . The main gallery 11 communicates with a plurality of oil passages (not shown), and the oil passages supply oil between the piston 3A and the cylinder 6 and a lubrication site such as the crankshaft 3C.

  In FIG. 1, the main gallery 11 and the supercharger 7 are connected by an oil pipe 30. The supercharger 7 is provided with a rotating shaft that connects the turbine and the compressor, and the oil in the main gallery 11 is supplied to the rotating shaft of the supercharger 7. That is, the oil pipe 30 circulates oil between the main gallery 11 and the supercharger 7.

A sensor 31 such as a pressure sensor or an oil temperature sensor is attached to the outer wall surface 3A of the cylinder block 3. For example, if it is a pressure sensor, the pressure of the oil which flows through the main gallery 11 will be detected, and detection information will be transmitted to the control circuit which is not shown in figure. Based on the detection information from the pressure sensor, the control circuit determines that the oil level of the oil pan 5 has decreased, whether there is an abnormality in the pressure of the oil flowing through the main gallery 11, and the like.
If it is an oil temperature sensor, the oil temperature of the oil flowing through the main gallery 11 is detected, and detection information is transmitted to a control circuit (not shown). The control circuit determines whether or not there is an abnormality in the oil temperature of the oil flowing through the main gallery 11 based on detection information from the oil temperature sensor.

  An oil cooler 25 is attached to the outer wall surface 3 a of the cylinder block 3. The oil cooler 25 is sandwiched between the sensor 31 and the oil pipe 30 in the extending direction of the main gallery 11, and the oil cooler 25 is installed in a space surrounded by the catalytic converter 8, the supercharger 7, and the sensor 31.

7 and 8, the sub gallery 10 is formed to extend in the vertical direction of the engine 2 inside the outer wall surface 3 a of the cylinder block 3. An oil discharge hole 12 is opened in the outer wall surface 3 a of the cylinder block 3, and the oil discharge hole 12 is a downstream portion of the sub gallery 10 in the oil discharge direction. An oil introduction hole 13 is formed in the outer wall surface 3a of the cylinder block 3, and the oil introduction hole 13 communicates with the main gallery 11 (see FIG. 3).
Here, the sub gallery 10 constitutes the first oil passage of the present invention, and the oil introduction hole 13 constitutes the second oil passage of the present invention.

4 and 6, a water jacket 15 is formed around the cylinder 6, and a cooling water passage (not shown) communicates with the water jacket 15. The engine 2 is provided with a water pump (not shown), and the water pump supplies cooling water to the water jacket 15 through the cooling water passage.
A cooling water passage 17 is formed in the cylinder block 3 (shown in phantom lines in FIGS. 3 and 7), and the cooling water passage 17 extends from the water jacket 15 to the outer wall surface 3 a of the cylinder block 3.

  7 and 8, a cooling water discharge hole 18 is opened on the outer wall surface 3a of the cylinder block 3, and the cooling water discharge hole 18 is a downstream portion of the cooling water passage 17 in the flow direction of the cooling water. This constitutes the first cooling water passage of the present invention. Further, the cooling water passage 17 of the present embodiment extends inward of the cylinder block 3 from the cooling water discharge hole 18 to the main gallery 11. A cooling water introduction hole 19 is opened in the outer wall surface 3 a of the cylinder head 4.

  In FIG. 4, a cooling water passage 20 is formed in the cylinder block 3. The cooling water passage 20 communicates with the cooling water introduction hole 19, and the cooling water introduction hole 19 flows in the cooling water passage 20. The upstream part of the direction.

  A water jacket 21 is formed in the cylinder head 4, and the cooling water passage 20 communicates with the water jacket 21. Thereby, the water jacket 21 is cooled by supplying the cooling water from the cooling water passage 20 to the water jacket 21.

  7 and 8, the cooling water discharge hole 18 is spaced upward from the main gallery 11 and opens to the outer wall surface 3 a of the cylinder block 3. The cooling water passage 17 includes a guide groove 23. The guide groove 23 is surrounded by a convex portion 22 protruding from the outer wall surface 3 a of the cylinder block 3 so as to extend in the vertical direction of the engine 2, and the guide groove 23 communicates with the cooling water discharge hole 18.

  An end 23a of the guide groove 23 extends from the cooling water discharge hole 18 to a position overlapping with the main gallery 11 in a direction orthogonal to the direction in which the cylinders 6 are arranged. It communicates with the cooling water passage of the cooler.

  Further, the oil discharge hole 12, the oil introduction hole 13, and the cooling water introduction hole 19 are formed in a convex portion 24 that protrudes from the outer wall surface 3 a of the cylinder block 3, and the protruding end 24 a of the convex portion 24 is the convex portion 22. Is formed on the same plane as the protruding end 22a. The protruding end 22a of the convex portion 22 and the protruding end 24a of the convex portion 24 are formed on a continuous surface.

  3 to 5, the sub gallery 10 is adjacent to the guide groove 23 in a direction orthogonal to the arrangement direction of the cylinders 6. The sub gallery 10 is formed at a position that overlaps a part of the main gallery 11 in a direction orthogonal to the arrangement direction of the cylinders 6. In other words, the sub gallery 10 is formed inside the outer wall surface 3 a of the cylinder block 3 so as to be sandwiched between a part of the main gallery 11 and the guide groove 23 in a direction orthogonal to the arrangement direction of the cylinders 6. The

  1 to 3 and 5, an oil cooler 25 is attached to the outer wall surface 3 a of the cylinder block 3 by bolts 26. As shown in FIG. 1, the oil cooler 25 is arranged in a direction in which the main gallery 11 extends. It is attached to the side of the catalytic converter 8.

  In FIGS. 1 and 2, the oil cooler 25 is congested on the cylinder block 3 side with respect to the compressor housing 7 </ b> B in a direction orthogonal to the arrangement direction of the cylinders 6. Here, the turbine housing 7A and the compressor housing 7B constitute a housing of the present invention, and the compressor housing 7B constitutes a part of the housing of the present invention.

  As shown in FIG. 9, the oil cooler 25 includes an oil passage 27 that communicates with the oil discharge hole 12 and the oil introduction hole 13, and a cooling water passage 28 that communicates with the cooling water discharge hole 18 and the cooling water introduction hole 19. ing.

  Oil is introduced into the oil passage 27 from the oil discharge hole 12, and the oil flowing through the oil passage 27 is discharged to the oil introduction hole 13. Cooling water is introduced into the cooling water passage 28 from the cooling water discharge hole 18 through the guide groove 23 and from the end 23 a of the guide groove 23, and the cooling water flowing through the cooling water passage 28 is discharged to the cooling water introduction hole 19.

Thereby, heat exchange is performed between the oil flowing through the oil passage 27 and the cooling water flowing through the cooling water passage 28, and the oil is cooled by the cooling water. Here, the oil passage 27 constitutes a third oil passage of the present invention, and the cooling water passage 28 constitutes a second cooling water passage of the present invention.
Here, in FIGS. 4, 5, and 8, the direction in which the cooling water flows is indicated by a symbol W, and the direction in which the oil flows is indicated by a symbol O.

  The oil cooler 25 has a mounting surface 25 a on the back surface, and the mounting surface 25 a is in contact with the protruding end 22 a of the convex portion 22 and the protruding end 24 a of the convex portion 24, and the outer wall surface of the cylinder block 3 by the bolt 26. It is attached to 3a.

  Further, when the mounting surface 25a of the oil cooler 25 abuts against the protruding end 22a of the convex portion 22, a cooling water passage is formed between the guide groove 23 and the mounting surface 25A.

  However, the inlet of the cooling water passage 28 of the oil cooler 25 communicates with the end portion 23a of the guide groove 23 in a direction orthogonal to the arrangement direction of the cylinders 6, and the cooling water flowing through the guide groove 23 flows into the cooling water passage 28. Led to.

  7 and 8, the depth of the guide groove 23 is smaller than the width of the guide groove 23, that is, the interval between the convex portions 22, and the bottom surface 23 b of the guide groove 23 is formed in a flat shape. Yes.

In the extending direction of the main gallery 11, the end 23 a of the guide groove 23 communicating with the oil introduction hole 13 and the cooling water passage 28 of the oil cooler 28 is adjacent via the convex portion 22, and the oil introduction hole 13 is It is located below the cooling water introduction hole 19.
Further, in the extending direction of the main gallery 11, the oil discharge hole 12 and the cooling water introduction hole 19 are adjacent to each other through the convex portion 24, and the end 23 a of the guide groove 23 is positioned below the oil discharge hole 12. To do.

Thus, according to the engine 2 of the present embodiment, the oil cooler 25 is attached to the side of the catalytic converter 8. A cooling water passage 17 formed in the cylinder block 3 extends in the vertical direction of the engine 2 and a cooling water discharge hole 18 that is spaced upward with respect to the main gallery 11 and opens in the outer wall surface 3 a of the cylinder block 3. Thus, the guide block 23 is surrounded by the convex portion 22 protruding from the outer wall surface 3 a of the cylinder block 3 and communicates with the cooling water discharge hole 18, and the end 23 a of the guide groove 23 has the cooling water discharge hole 18. The end portion 23 a of the guide groove is adjacent to the oil introduction hole 13 through the convex portion 22 in the extending direction of the main gallery 11.

  Thereby, the end 23a of the guide groove 23 communicating with the coolant passage 28 and the oil introduction hole 13 can be brought close to each other in the extending direction of the main gallery 11. For this reason, the length of the extending direction of the main gallery 11 of the oil cooler 25 attached to the outer wall surface 3a of the cylinder block 3 can be shortened. Therefore, a sufficient space for installing the oil cooler 25 can be secured in the space of the cylinder block 3 on the side of the catalytic converter 8.

  Further, according to the engine 2 of the present embodiment, the oil cooler 25 sinks into the cylinder block 3 side with respect to a part of the compressor housing 7B of the supercharger 7 in a direction orthogonal to the arrangement direction of the cylinders 6.

  Thereby, it can overlap with a part of the supercharger 7 installed on the outer wall surface 3a of the cylinder block 3 in a direction orthogonal to the arrangement direction of the cylinders 6, and the space of the cylinder block 3 on the side of the catalytic converter 8 can be made. The space where the oil cooler 25 is installed on the outer wall surface 3a of the cylinder block 3 can be effectively utilized and effectively secured.

  In the engine 2 of the present embodiment, the cooling water discharge hole 18 is spaced upward from the main gallery 11 and opens on the outer wall surface 3a of the cylinder block 3. However, the cooling water discharge hole 18 You may open in the outer wall face 3a of the cylinder block 3 spaced apart with respect to the gallery 11 below.

  Further, according to the engine 2 of the present embodiment, the oil cooler 25 is sandwiched between the sensor 31 and the oil pipe 30 in the extending direction of the main gallery 11. As a result, when the sensor 31 and the oil pipe 30 are installed in the direction in which the main gallery 11 extends, the cylinder block on the side of the catalytic converter 8 can be shortened by the length of the oil cooler 25 in the direction in which the main gallery 11 extends. The space for installing the oil cooler 25 in the space 3 can be sufficiently secured.

Further, according to the engine 2 of the present embodiment, the sub gallery 10 has the oil discharge holes 12 formed in the outer wall surface 3 a of the cylinder block 3, and the sub gallery 10 is connected to the inner wall surface 3 a of the cylinder block 3. The sub gallery 10 is adjacent to the guide groove 23 in the direction perpendicular to the arrangement direction of the cylinders 6.

  Thereby, the oil discharge hole 12 and the end 23 a of the guide groove 23 communicating with the cooling water discharge hole 18 can be overlapped in the vertical direction of the engine 2. For this reason, compared with the case where the oil discharge hole 12 and the cooling water discharge hole 18 are formed on the outer wall surface 3a of the cylinder block 3 side by side in the direction in which the main gallery 11 extends, the direction in which the main gallery 11 of the oil cooler 25 extends. Can be shortened. Therefore, a space for installing the oil cooler 25 in the space of the cylinder block 3 on the side of the catalytic converter 8 can be more effectively ensured.

  Further, in the engine 2 of the present embodiment, the cooling water passage 17 is spaced upward with respect to the main gallery 11 and opens to the outer wall surface 3 a of the cylinder block 3, and in the vertical direction of the engine 2. It has a guide groove 23 which is surrounded by a convex portion 22 protruding from the outer wall surface 3 a of the cylinder block 3 so as to extend and communicates with the cooling water discharge hole 18.

  Then, the end 23 a of the guide groove 23 is extended from the cooling water discharge hole 18 to a position overlapping with the main gallery 11 in a direction orthogonal to the arrangement direction of the cylinders 6, and the end 23 a of the guide groove 23 is cooled by the oil cooler 25. The water passage 28 was communicated.

Thereby, a part of the cooling water passage 17 communicating with the cooling water passage 28 of the oil cooler 25 from the cooling water discharge hole 18 is constituted by the guide groove 23, and the cooling water discharge hole 18 can be separated upward from the main gallery 11. it can. For this reason, it is possible to prevent the cooling water discharge hole 18 from being complicated, and to connect the cooling water discharge hole 18 to the water jacket 21.
As a result, the position of the cooling water passage 17 formed in the cylinder block 3 can be optimized, and the cooling water passage 17 can be easily processed in the cylinder head 4.

  Further, since a part of the cooling water passage 17 communicating with the cooling water passage 28 of the oil cooler 25 from the cooling water discharge hole 18 can be constituted by the guide groove 23, a part of the cooling water passage 17 is cylinder block by casting. 3 can be formed integrally. For this reason, the cooling water passage 17 can be easily processed, and the productivity of the cylinder block 3 can be improved.

  Further, according to the engine 2 of the present embodiment, the sub gallery 10 has the oil introduction hole 13 that is opened in the outer wall surface 3 a of the cylinder block 3 and into which oil is introduced from the oil passage 27. The end 23a of the guide groove 23 was made adjacent.

  Thereby, the oil discharge hole 12, the oil introduction hole 13, the cooling water discharge hole 18 and the cooling water introduction hole 19 can be provided close to each other, and the installation area of the oil cooler 25 with respect to the outer wall surface 3a of the cylinder block 3 can be reduced. . For this reason, the oil cooler 25 can be further reduced in size.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

2 ... Engine (internal combustion engine), 3 ... Cylinder block (engine body), 3a ... Outer wall surface, 4 ... Cylinder head (engine body), 5 ... Oil pan (oil supply source) , 6 ... cylinder, 7 ... supercharger, 7A ... turbine housing (housing), 7B ... compressor housing (housing, part of housing), 8 ... catalytic converter, 9 .... Oil filter (oil supply source), 10 ... sub gallery (first oil passage), 11 ... main gallery, 13 ... oil introduction hole (second oil passage), 17 ... cooling Water passage (first cooling water passage), 18 ... Cooling water discharge hole (first cooling water passage) 19 ... Cooling water introduction hole, 22 ... Projection, 22a ... Projection end ( Projection end of convex part), 23 ... guide groove, 25 ... oil cooler, 27 ... oil passage (third oil passage), 28 ... cooling water passage (first Cooling water passages) 31 ... sensor, 32 ... oil pipe

Claims (4)

A main gallery that extends in the arrangement direction of the cylinders and supplies oil to the lubrication site, a first oil passage to which oil is supplied from an oil supply source, and oil that is supplied from the first oil passage to the main gallery An engine body including a second oil passage to be introduced and a first cooling water passage to which cooling water is supplied from a water jacket;
A catalytic converter attached to the engine body for purifying exhaust gas;
A third oil passage that is attached to a side of the catalytic converter in a direction in which the main gallery extends and communicates the first oil passage and the second oil passage, and communicates with the first cooling water passage. An oil cooler that exchanges heat between oil flowing through the third oil passage and cooling water flowing through the second cooling water passage,
In the internal combustion engine, the second oil passage has an oil introduction hole that is opened in an outer wall surface of the engine body and is formed at a position overlapping with a part of the main gallery in a direction orthogonal to the arrangement direction of the cylinders. And
The engine is configured such that the first cooling water passage extends upward or downward of the internal combustion engine, and a cooling water discharge hole that opens upward or downward from the main gallery and opens in an outer wall surface of the engine body. A guide groove surrounded by a protrusion protruding from the outer wall surface of the main body and communicating with the cooling water discharge hole;
An end portion of the guide groove extends from the cooling water discharge hole to the main gallery, and an end portion of the guide groove is adjacent to the oil introduction hole via the convex portion in a direction in which the main gallery extends. A characteristic internal combustion engine. A turbocharger having a housing is attached to the engine body,
2. The internal combustion engine according to claim 1, wherein the oil cooler sinks into the engine main body with respect to a part of the housing in a direction orthogonal to the arrangement direction of the cylinders. A sensor that is attached to the outer wall surface of the engine body and detects the pressure or oil temperature of the oil flowing through the main gallery, and is attached to the outer wall surface of the engine body, between the main gallery and the supercharger. With oil piping to circulate,
The internal combustion engine according to claim 1 or 2, wherein the oil cooler is sandwiched between the sensor and the oil pipe in a direction in which the main gallery extends. The first oil passage has an oil discharge hole formed in an outer wall surface of the engine body;
The first oil passage is formed to extend in the vertical direction of the internal combustion engine on the inner side of the outer wall surface of the engine body;
The internal combustion engine according to any one of claims 1 to 3, wherein the first oil passage is adjacent to the guide groove in a direction orthogonal to the arrangement direction of the cylinders.

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