JP6318961B2 - 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 a lubrication site between a piston and a crankshaft provided in the internal combustion engine, a lubrication site between a camshaft and a cam bearing, and the like. 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.

  This oil cooler is equipped with an oil pipe separate from the internal combustion engine and a cooling water pipe surrounding the oil pipe, etc., resulting in restrictions on the layout around the internal combustion engine and an increase in weight and cost due to an increase in the number of parts. Therefore, an internal combustion engine in which an oil cooler is directly attached to a cylinder block in order to eliminate these problems is known (for example, see Patent Document 1).

  This internal combustion engine has an exhaust port for discharging oil on an outer wall surface of a cylinder block, an oil reservoir surrounding the periphery of the discharge port, and introducing oil into an oil cooler, and a cooling water supply channel formed above the oil reservoir And a drainage channel.

  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.

  The oil discharge port communicates with a main gallery formed in the cylinder block, and the oil discharge port is formed at a position overlapping with a part of the main gallery in a direction orthogonal to the arrangement direction of the cylinders.

Japanese Utility Model Publication No. 5-47340

  In such a conventional internal combustion engine, an oil sump is formed around an oil discharge port formed on the outer wall surface of the cylinder block, and a cooling water supply channel and a drainage channel are provided above the oil sump. Is formed.

  For this reason, 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.

  In order to reduce the structure of the oil passage and the cooling water passage, when at least one of the water supply channel and the drainage channel is formed adjacent to the oil discharge port, the oil discharge port is orthogonal to the cylinder arrangement direction. Since it is formed at a position that overlaps a part of the main gallery in the direction in which the main gallery is formed, it is necessary to straddle the main gallery in order to drill the oil discharge port.

  For this reason, in order to perform drilling of the oil discharge port, holes are connected to the cylinder block from different directions, and then the holes are connected, and the water supply channel and the drain channel are connected to the cooling water inside the cylinder block. It is necessary to communicate with the passage. For this reason, processing of a water supply channel and a drainage channel will become troublesome, and productivity of a cylinder block will fall.

  The present invention has been made paying attention to the above-described problems, and can optimize the position of the cooling water passage formed in the cylinder block and easily process the cooling water passage in the cylinder head. An object of the present invention is to provide an internal combustion engine.

  According to a first aspect of the present invention, a main gallery that extends in the arrangement direction of the cylinders and supplies oil to a lubricating portion, 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 Cylinder block having a second oil passage for introducing the oil to be supplied to the main gallery, a first cooling water passage to which cooling water is supplied from the water jacket, and a first oil passage attached to the cylinder block A third oil passage for introducing the oil supplied from the second oil passage to the second oil passage, and a second cooling water passage for introducing the cooling water from the first cooling water passage. And an oil cooler for exchanging heat between the oil flowing through the second cooling water passage and the cooling water flowing through the second cooling water passage, and the second oil passage is inserted into the cylinder block so that the oil is introduced from the third oil passage. An internal combustion engine having an oil introduction hole formed at a position overlapping with a part of the main gallery in a direction perpendicular to the arrangement direction of the cylinders, wherein the first cooling water passage is formed in the main gallery. The cooling water discharge hole that opens to the outer wall surface of the cylinder block and is spaced apart upward or downward with respect to the upper surface of the cylinder block, and the protrusion that protrudes from the outer wall surface of the cylinder block so as to extend in the vertical direction of the internal combustion engine. A guide groove communicating with the discharge hole, the end of the guide groove extending from the cooling water discharge hole to a position overlapping with the main gallery in a direction perpendicular to the cylinder arrangement direction, and the end of the guide groove extending to the oil cooler The second coolant passage communicates with the second coolant passage.

  As described above, according to the first aspect, in the internal combustion engine, the first cooling water passage is separated from the main gallery upward or downward, and the cooling water discharge hole opened on the outer wall surface of the cylinder block. A guide groove that extends from the outer wall surface of the cylinder block so as to extend in the vertical direction of the internal combustion engine and communicates with the cooling water discharge hole. The end of the guide groove extends from the cooling water discharge hole. It extended to the position which overlaps with the main gallery in the direction orthogonal to the arrangement direction of the cylinders, and the end of the guide groove was communicated with the second cooling water passage of the oil cooler.

  Thereby, a part of the cooling water passage communicating from the cooling water discharge hole to the second cooling water passage of the oil cooler can be constituted by the guide groove, and the cooling water discharge hole can be separated upward or downward from the main gallery. For this reason, it can prevent that the drilling process of a cooling water discharge hole becomes complicated, and can communicate a cooling water discharge hole with a water jacket.

  In addition, since a part of the first cooling water passage communicating with the second cooling water passage of the oil cooler from the cooling water discharge hole can be constituted by a guide groove, a part of the cooling water passage can be formed by casting the cylinder block. And can be molded integrally. For this reason, the processing of the first cooling water passage can be performed more easily, and the productivity of the cylinder block can be improved.

  Also, if the part corresponding to the guide groove is formed by drilling instead of the guide groove, it is necessary to make the oil cooler mounting surface greatly protrude from the outer wall surface of the cylinder block by the diameter of the hole. There is. For this reason, an oil cooler will be installed in the distance from the outer wall surface of a cylinder block, and the installation space of an oil cooler will become large.

  On the other hand, since the internal combustion engine of the present embodiment is configured by the guide groove surrounded by the convex portion protruding from the outer wall surface of the first cooling water passage, the mounting surface of the oil cooler, that is, the protruding end of the convex portion There is no need to project the cylinder from the outer wall surface of the cylinder block.

  Thereby, an oil cooler can be installed near the outer wall surface of a cylinder block, and the installation space of an oil cooler can be made small.

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 plate.

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).

  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 reciprocally provided inside the cylinder 6. 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), and the turbine and the compressor are connected by a rotating shaft. In FIG. 1, the rotation center axis 7a of the rotation axis is indicated by a broken line. 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 flowing through the main gallery 11 is supplied through the oil passages 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, and the oil in the main gallery 11 is supplied to the rotating shaft of the supercharger 7.

  A pressure sensor 31 is attached to the outer wall surface 3a of the cylinder block 3, and the pressure sensor 31 detects the pressure of oil flowing through the main gallery 11 and transmits detection information to a control circuit (not shown). Based on the detection information from the pressure sensor 31, the control circuit determines that the oil level of the oil pan 5 has decreased and whether there is an abnormality in the pressure of the oil flowing through the main gallery 11.

  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 pressure 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 pressure sensor 31. The

  7 and 8, an oil discharge hole 12 is formed 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.

3 and 4, the oil introduction hole 13 is formed at a position overlapping with a part of the main gallery 11 in a direction orthogonal to the arrangement direction of the cylinders 6.
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 (shown in phantom lines in FIGS. 3 and 7) is formed in the cylinder block 3, 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.

  The 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 arrangement direction of the cylinders 6, and the end 23a of the guide groove 23 is oil which will be described later. 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 (see FIG. 3). 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.

  1 to 3 and 5, an oil cooler 25 is attached to the outer wall surface 3 a of the cylinder block 3 by a bolt 26, and the oil cooler 25 is attached to the side of the catalytic converter 8.

  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 3 a of the cylinder block 3 by the bolt 26. Mounted on.

  In addition, the guide groove 23 forms a cooling water passage when the mounting surface 25 a of the oil cooler 25 contacts the protruding end 22 a of the convex portion 22. 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.

  In FIG. 3, in the direction orthogonal to the arrangement direction of the cylinders 6, a part of the sub gallery 10 is a part of the cylinder block 3 between the main gallery 11 and the guide groove 23 (hereinafter, this part is referred to as a thick part 29). ).

  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.

  The oil introduction hole 13 into which oil is introduced from the oil passage 27 of the oil cooler 25 and the end 23a of the guide groove 23 are adjacent to each other in the horizontal direction via the convex portion 22, and the oil introduction hole 13 and the cooling water introduction hole 19 are opposed to each other in the vertical direction. The oil discharge hole 12 and the cooling water introduction hole 19 are adjacent to each other in the horizontal direction via the convex portion 24, and the oil discharge hole 12 and the end portion 23a of the guide groove 23 are opposed in the vertical direction.

  Thus, in the engine 2 of the present embodiment, the cooling water passage 17 is spaced upward from the main gallery 11 and opens to the outer wall surface 3 a of the cylinder block 3, and the vertical direction of the engine 2. And 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 communicate 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, if the portion corresponding to the guide groove 23 is formed by a hole formed by drilling instead of the guide groove 23, the mounting surface 25a of the oil cooler 25 is set to the cylinder block 3 by the diameter of the hole. It is necessary to make it protrude largely from the outer wall surface 3a. For this reason, the oil cooler 25 is installed far from the outer wall surface 3a of the cylinder block 3, and the installation space of the oil cooler 25 is increased.

On the other hand, since the engine 2 of the present embodiment is configured with the guide groove 23 surrounded by the convex portion 22 protruding from the outer wall surface 3a, the mounting surface 25a of the oil cooler 25, i.e., the convex portion. It is not necessary to project the protruding end 22a of 22 greatly from the outer wall surface 3a of the cylinder block 3.
Thereby, the oil cooler 25 can be installed near the outer wall surface 3a of the cylinder block 3, and the installation space of the oil cooler 25 can be reduced.

  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 cooling water passage 17 extends from the cooling water discharge hole 18 to the inside of the cylinder block 3 and communicates with the water jacket 21. Thereby, the cooling water discharge hole 18 can be communicated with the water jacket 21 by one process without straddling the main gallery 11, and the cooling water discharge hole 18 can be easily processed.

  Further, according to the engine 2 of the present embodiment, in the direction orthogonal to the arrangement direction of the cylinders 6, a part of the sub gallery 10 is a thick portion 29 of the cylinder block 3 between the main gallery 11 and the guide groove 23. Formed.

  Thereby, a part of sub gallery 10 can be formed using the thick part 29 of the cylinder block 3 between the main gallery 11 and the guide groove 23, and the sub gallery 10 is easily formed in the cylinder block 3. it can.

  Further, since the sub gallery 10 can be formed so as to overlap with the guide groove 23, the thickness from the outer wall surface 3a of the cylinder block 3 for forming the sub gallery 10 and the guide groove 23, that is, the protruding amount can be reduced. Therefore, the protruding amount of the convex portion 22 from the outer wall surface 3a of the cylinder block 3 can be reduced.

  Here, as described above, if the portion corresponding to the guide groove 23 is formed by a hole formed by drilling instead of the guide groove 23, the hole is circular, It is necessary to make the mounting surface 25a of the oil cooler 25 greatly protrude from the outer wall surface 3a of the cylinder block 3 by the amount.

  On the other hand, by forming the depth of the guide groove 23 smaller than the width of the guide groove 23 and forming the bottom surface of the guide groove 23 in a flat shape, the convex portion 22 from the outer wall surface 3a of the cylinder block 3 is formed. The amount of protrusion can be reduced. For this reason, it is possible to more effectively prevent the mounting surface 25 a of the oil cooler 25 from protruding greatly from the outer wall surface 3 a of the cylinder block 3.

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

  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, 3a ... Outer wall surface, 5 ... Oil pan (oil supply source), 6 ... Cylinder, 9 ... Oil filter (oil) (Supply source), 10 ... sub gallery (first oil passage), 11 ... main gallery, 13 ... oil introduction hole (second oil passage), 15 ... water jacket, 17 .. .Cooling water passage (first cooling water passage), 18 ... cooling water discharge hole (first cooling water passage) 19 ... cooling water introduction hole, 22 ... convex portion, 22a ... projection End (projection end of convex part), 23 ... guide groove, 23a ... end part (end part of guide groove), 23b ... bottom face (bottom face of guide groove), 25 ... oil cooler, 27 ... Oil passage (third oil passage), 28 ... Cooling water passage (second cooling water passage)

Claims (5)

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 A cylinder block having a second oil passage to be introduced and a first cooling water passage to which cooling water is supplied from a water jacket;
A third oil passage, which is attached to the cylinder block and introduces oil supplied from the first oil passage into the second oil passage, and cooling water is introduced from 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,
The second oil passage is opened on the outer wall surface of the cylinder block so that oil is introduced from the third oil passage, and overlaps a part of the main gallery in a direction orthogonal to the arrangement direction of the cylinders. An internal combustion engine having an oil introduction hole formed at a position,
The first cooling water passage is spaced upward or downward with respect to the main gallery and opens to the outer wall surface of the cylinder block, and the cylinder extends in the vertical direction of the internal combustion engine. A guide groove surrounded by a protrusion protruding from the outer wall surface of the block and communicating with the cooling water discharge hole;
The end of the guide groove is extended from the cooling water discharge hole to a position overlapping with the main gallery in a direction orthogonal to the arrangement direction of the cylinders, and the end of the guide groove is extended to the second cooling of the oil cooler. An internal combustion engine characterized by communicating with a water passage.   2. The internal combustion engine according to claim 1, wherein the first cooling water passage extends from the cooling water discharge hole to an inner side of the cylinder block than the main gallery and communicates with the water jacket.   2. A part of the first oil passage is formed at a portion of the cylinder block between the main gallery and the guide groove in a direction orthogonal to the arrangement direction of the cylinders. Or the internal combustion engine of Claim 2.   The depth of the said guide groove is formed smaller than the width | variety of the said guide groove, The bottom face of the said guide groove is formed in flat shape, The Claim 1 characterized by the above-mentioned. Internal combustion engine. The internal combustion engine according to any one of claims 1 to 4, wherein the oil introduction hole and an end of the guide groove are adjacent to each other.

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