engine

Abstract

To provide a technology suitable for an engine including two cylinder rows and an intercooler.SOLUTION: An exemplary engine includes: two cylinder rows placed so as to be aligned side by side; a turbocharger; and an intercooler shared by the two cylinder rows, and connected to the turbocharger. The intercooler has: a coolant passage through which a coolant flows; and an intake flow passage through which intake air from the turbocharger flows. The coolant passage has an inlet and an outlet of the coolant on one side in a first direction along flow of the coolant. The intake flow passage has an inlet of the intake air on one side in a second direction along flow of the intake air, and an outlet of the intake air on the other side.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to an engine. [Background technology]

[0002] Conventionally, a V-type engine having an intercooler has been known (see, for example, Patent Document 1). The V-type engine disclosed in Patent Document 1 has a pair of banks. An intercooler is disposed above the cylinder head of each bank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-100217 A Summary of the Invention [Problem to be solved by the invention]

[0004] If an intercooler is provided for each of a pair of banks, there is a concern that the number of parts will increase, resulting in increased costs or an increase in engine size. In addition, if an intercooler is provided for each of a pair of banks, for example, a difference in the flow rate or flow speed of the coolant between the two intercoolers is likely to occur, which may result in a difference in cooling performance between the banks.

[0005] An object of the present invention is to provide a technique suitable for an engine having two cylinder rows and an intercooler. [Means for solving the problem]

[0006] An exemplary engine of the present invention includes two rows of cylinders arranged side by side, a turbocharger, and an intercooler shared by the two rows of cylinders and connected to the turbocharger. The intercooler has a coolant flow path through which a coolant flows, and an intake air flow path through which intake air from the turbocharger flows. The coolant flow path has an inlet and an outlet for the coolant on one side in a first direction along the flow of the coolant. The intake air flow path has an intake air inlet on one side in a second direction along the flow of the intake air, and an intake air outlet on the other side. Effect of the Invention

[0007] According to the exemplary embodiment of the present invention, in an engine having two cylinder rows and an intercooler, the number of parts can be reduced. Also, according to the exemplary embodiment of the present invention, it is possible to suppress a difference in the intake air temperature adjustment by the intercooler between the two cylinder rows. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing the configuration of an engine. [Diagram 2] FIG. 2 is a schematic perspective view showing a portion of the engine that is composed of a cylinder block, a head block, and a head cover. [Diagram 3] Schematic cross-sectional view of a cylinder block portion of an engine. [Figure 4] Schematic top view showing the engine configuration [Diagram 5] A schematic perspective view showing the components that make up the intake and exhaust system of an engine. [Figure 6] FIG. 6 is a schematic plan view of the turbocharger and some of the parts around the turbocharger removed from the diagram shown in FIG. 5, as seen from the rear. [Figure 7] FIG. 6 is a schematic plan view of the turbocharger and some of its peripheral parts removed from the view shown in FIG. 5. [Figure 8] FIG. 6 is a schematic plan view from the right side of the diagram shown in FIG. 5 with the turbocharger and some of its surrounding parts removed. [Figure 9] FIG. 1 is a schematic perspective view of an intercooler provided in an engine; [Figure 10] A schematic perspective view showing two intake manifolds provided on an engine. [Figure 11] FIG. 1 is a first cross-sectional perspective view showing a schematic configuration of an intercooler provided in an engine; [Figure 12] FIG. 2 is a second cross-sectional perspective view showing a schematic configuration of an intercooler provided in an engine; [Figure 13] A diagram to explain the flow of coolant and intake air in an intercooler installed in an engine. [Figure 14] FIG. 13 is a schematic diagram showing a configuration of an intercooler according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the following description, the X direction is the front-rear direction, the Y direction is the left-right direction, and the Z direction is the up-down direction. The +X side is the front side, and the -X side is the rear side. The +Y side is the right side, and the -Y side is the left side. The +Z side is the upper side, and the -Z side is the lower side. In detail, the direction in which the center line C of the crankshaft (output shaft) shown in FIG. 1 extends is the front-rear direction, and the side where the flywheel 2 is arranged with respect to the cylinder block 1 is the rear side. In addition, the up-down direction is defined as the side where the oil pan 3 is arranged with respect to the cylinder block 1 is the lower side. The direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction, and the side that is the right side when viewed from the rear toward the front is the right side, and the side that is the left side is the left side. In addition, these directions are names used simply for explanation, and are not intended to limit the actual positional relationship and direction. In this specification, the crankshaft direction is the same as the front-rear direction in which the center line C of the crankshaft extends.

[0010] <1. Engine Overview> Fig. 1 is a schematic perspective view showing a configuration of an engine 100 according to an embodiment of the present invention. The engine 100 is suitable as a marine engine for use in ships, for example. However, the engine 100 is not limited to being a marine engine and may be applied to other applications. The engine 100 is a diesel engine.

[0011] As shown in Fig. 1, engine 100 includes a cylinder block 1, a head block 4, and a head cover 5. Fig. 2 is a schematic perspective view showing a portion of engine 100 that includes cylinder block 1, head block 4, and head cover 5. Fig. 3 is a schematic cross-sectional view of the cylinder block 1 portion of engine 100.

[0012] As shown in Figures 2 and 3, a crankshaft 6 and a piston 7 extending in the front-rear direction are disposed inside the cylinder block 1. The inside of the cylinder block 1 is connected to the inside of an oil pan 3 disposed below and storing lubricating oil. A flywheel 2 (see Figure 1) is attached to the rear end of the crankshaft 6. The flywheel 2 rotates integrally with the crankshaft 6 and is used to extract power from the engine 100. More specifically, the piston 7 is disposed in a cylinder 11 formed in the cylinder block 1. The piston 7 is connected to the crankshaft 6 via a connecting rod 71.

[0013] In detail, the cylinder block 1 has a right cylinder 11R arranged on the right side and a left cylinder 11L arranged on the left side. The right cylinder 11R is cylindrical inclined to the right side with respect to the vertical direction and extends in an oblique direction when viewed from the rear. The left cylinder 11L is cylindrical inclined to the left side with respect to the vertical direction and extends in an oblique direction when viewed from the rear. The right cylinder 11R and the left cylinder 11L are arranged in a V-shape. The pair of right cylinder 11R and left cylinder 11L arranged in a V-shape are arranged with the cylinder axes slightly shifted in the front-rear direction. In this embodiment, the left cylinder 11L is arranged slightly forward of the right cylinder 11R.

[0014] The cylinder block 1 has a right cylinder row 111R in which a plurality of right cylinders 11R are arranged in the front-rear direction, and a left cylinder row 111L in which a plurality of left cylinders 11L are arranged in the front-rear direction. That is, the engine 100 has two cylinder rows 111R, 111L. Each of the two cylinder rows 111R, 111L extends in the crankshaft direction. The two cylinder rows 111R, 111L are arranged side by side. In addition, the two cylinder rows 111R, 111L are arranged in the left-right direction in detail. The right cylinder row 111R and the left cylinder row 111L form a V-shaped bank. In this embodiment, the number of right cylinders 11R constituting the right cylinder row 111R and the number of left cylinders 11L constituting the left cylinder row 111L are both six, for example. That is, the engine 100 of this embodiment is a V-type 12-cylinder engine.

[0015] In each of the right cylinder row 111R and the left cylinder row 111L, a head block 4 is disposed overlapping each cylinder 11. The head block 4 is fastened to the cylinder block 1 using a screw. In detail, the head block 4 includes a right head block 4R overlapping the right cylinder 11R and a left head block 4L overlapping the left cylinder 11L. The right head blocks 4R are overlapped one by one on each of the right cylinders 11R, so that there are as many right cylinders 11R as there are right cylinders 11R. The left head blocks 4L are overlapped one by one on each of the left cylinders 11L, so that there are as many left cylinders 11L as there are left cylinders 11L. In this embodiment, the number of right head blocks 4R and left head blocks 4L is six.

[0016] Each head block 4 has an intake port 41 for supplying gas to a combustion chamber formed by the cylinder 11, piston 7, and head block 4, and an exhaust port (not shown) for exhausting gas from the combustion chamber. The exhaust port is provided on the surface opposite to the surface on which the intake port 41 is provided. In detail, the right head block 4R has an intake port 41 on its left side surface and an exhaust port on its right side surface. The left head block 4L has an intake port 41 on its right side surface and an exhaust port on its left side surface.

[0017] A head cover 5 is placed on top of each head block 4. The head cover 5 is fastened to the head block 4 with screws. Each head cover 5 covers an intake valve and an exhaust valve (not shown) arranged on the head block 4. An injector 8 is attached to each head cover 5. One end of the injector 8, which is provided with an injection port for injecting fuel, faces the combustion chamber. The other end of the injector 8 protrudes from the head cover 5 towards the outside.

[0018] In detail, the head cover 5 includes a right head cover 5R that is placed on the right head block 4R and a left head cover 5L that is placed on the left head block 4L. The right head covers 5R are placed on each right head block 4R, so there are the same number of right head covers 5R as the number of right head blocks 4R. The left head covers 5L are placed on each left head block 4L, so there are the same number of left head blocks 4L. In this embodiment, the number of right head covers 5R and left head covers 5L is six. The number of right injectors 8R arranged on the right head cover 5R and the number of left injectors 8L arranged on the left head cover 5L are also six.

[0019] On the right side of the cylinder block 1, the right cylinder 11R, the right head block 4R, and the right head cover 5R that constitute the right bank RB extend obliquely upward to the right. On the left side of the cylinder block 1, the left cylinder 11L, the left head block 4L, and the left head cover 5L that constitute the left bank LB extend obliquely upward to the left. In a plan view from the front-rear direction, the right bank RB and the left bank LB are V-shaped, and the engine 100 has a V-bank. An intra-bank area 200 is formed between the right bank RB and the left bank LB in the left-right direction.

[0020] Returning to FIG. 1, the engine 100 includes a top cover 9 and a side cover 10. The top cover 9 prevents water from splashing on the controller 26 (see FIG. 4, etc., described later) and other components disposed inside the engine 100 due to, for example, condensation. The side cover 10 prevents fuel from scattering due to, for example, cracks in components such as the head block 4. Although FIG. 1 only shows the side cover 10 disposed on the right side, a similar side cover 10 is also disposed on the left side. That is, the engine 100 includes a pair of left and right side covers 10.

[0021] Fig. 4 is a schematic top view showing the configuration of an engine 100 according to an embodiment of the present invention. The top cover 9 and the pair of side covers 10 are omitted in Fig. 4. As shown in Figs. 1 and 4, the engine 100 includes an intake manifold 21 and an exhaust manifold 22.

[0022] The intake manifold 21 distributes intake air, which is air or a mixture drawn in from the outside, to each cylinder 11. The intake manifold 21 is disposed on the upper part of the engine 100 and extends in the front-rear direction. In detail, the intake manifold 21 includes a right intake manifold 21R for the right cylinder 11R and a left intake manifold 21L for the left cylinder 11L. That is, the engine 100 includes two intake manifolds 21R, 21L.

[0023] The right intake manifold 21R is disposed above the intake ports 41 (see FIG. 2) of the multiple right head blocks 4R aligned in the front-rear direction. The interior of the right intake manifold 21R is connected to each of the right cylinders 11R via each of the intake ports 41. The left intake manifold 21L is disposed above the intake ports 41 of the multiple left head blocks 4L aligned in the front-rear direction. The interior of the left intake manifold 21L is connected to each of the left cylinders 11L via each of the intake ports 41.

[0024] In more detail, an intake valve (not shown) is interposed between each intake port 41 and each cylinder 11, and when the intake valve is opened, the inside of the intake manifold 21 and the cylinder 11 communicate with each other.

[0025] The exhaust manifold 22 collects exhaust from each cylinder 11. The exhaust manifold 22 is disposed on a side portion of the engine 100 and extends in the front-rear direction. In detail, the exhaust manifold 22 includes a right exhaust manifold 22R for the right cylinder 11R and a left exhaust manifold 22L for the left cylinder 11L.

[0026] The right exhaust manifold 22R is disposed on the right side of multiple right head blocks 4R (see FIG. 2) arranged in the front-rear direction. The interior of the right exhaust manifold 22R and each right cylinder 11R are connected via exhaust ports (not shown) provided on the right side of the right head block 4R. The left exhaust manifold 22L is disposed on the left side of multiple left head blocks 4L (see FIG. 2) arranged in the front-rear direction. The interior of the left exhaust manifold 22L and each left cylinder 11L are connected via exhaust ports (not shown) provided on the left side of the left head block 4L.

[0027] In more detail, an exhaust valve (not shown) is interposed between each exhaust port and each cylinder 11, and when the exhaust valve is opened, the inside of the exhaust manifold 22 and the cylinder 11 communicate with each other.

[0028] The exhaust gas collected in the right exhaust manifold 22R is exhausted to the outside via a right supercharger 23R and a right exhaust outlet pipe 24R arranged at the right rear of the engine 100. The exhaust gas collected in the left exhaust manifold 22L is exhausted to the outside via a left supercharger 23L and a left exhaust outlet pipe 24L arranged at the left rear of the engine 100. That is, the engine 100 is equipped with a supercharger 23.

[0029] The right turbocharger 23R and the left turbocharger 23L each have a compressor section 231 and a turbine section 232. The compressor section 231 pressurizes and compresses intake air such as air supplied from outside the engine 100. The pressurized and compressed intake air is supplied to the intake manifold 21 via the intercooler 25. The turbine section 232 is rotated by exhaust gas supplied from the exhaust manifold 22. The rotational power of the turbine section 232 is transmitted to the compressor section 231. That is, the right turbocharger 23R and the left turbocharger 23L of this embodiment are so-called turbochargers that use an exhaust gas turbine as a drive source.

[0030] The intercooler 25 connected to the intake manifold 21 is supplied with cooling water by a cooling water pump (not shown) and cools the intake air. The intake air supplied from the compressor unit 231 is pressurized and compressed, generating compression heat and increasing the temperature. The intercooler 25 cools the intake air by exchanging heat between the cooling water supplied from the cooling water pump and the pressurized and compressed intake air. In other words, by providing the intercooler 25, the temperature of the intake air supplied to the intake manifold 21 can be adjusted to a desired temperature.

[0031] As shown in Fig. 4, the right intake manifold 21R and the left intake manifold 21L are arranged at a distance from each other in the left-right direction on the upper part of the engine 100. As shown in Fig. 4, when the top cover 9 is removed, the in-bank area 200 is exposed to the outside through the space between the right intake manifold 21R and the left intake manifold 21L. In the in-bank area 200, for example, a controller 26 that controls the entire engine 100, a fuel pump 27 that supplies fuel to the injector 8, etc. are arranged.

[0032] That is, the engine 100 includes a controller 26 disposed in an intra-bank area 200 located between the right cylinder row 111R and the left cylinder row 111L. The engine 100 also includes a fuel pump 27 disposed in the intra-bank area 200. Note that, strictly speaking, the intra-bank area 200 may be the spatial area between the right cylinder row 111R and the left cylinder row 111L. However, in this embodiment, the intra-bank area 200 broadly includes the spatial area in the left-right direction between the right bank RB including the right cylinder row 111R and the left bank LB including the left cylinder row 111L.

[0033] By arranging the controller 26 and the fuel pump 27 in the in-bank area 200, the in-bank area 200 can be efficiently used for arranging parts, thereby making it possible to reduce the size of the engine 100. However, the controller 26 and the fuel pump 27 may be arranged outside the in-bank area 200.

[0034] In addition, the controller 26 specifically includes a first controller 261 and a second controller 262. However, the number of controllers 26 may be changed as appropriate, and for example, the controller 26 may be configured with only one controller. In this embodiment, the first controller 261 and the second controller 262 are arranged in the front-rear direction (crankshaft direction). In detail, the first controller 261 is located forward of the second controller 262. One of the first controller 261 and the second controller 262 is a main controller, and the other is a sub-controller. In this embodiment, the first controller 261 is a main controller, and the second controller 262 is a sub-controller.

[0035] The first controller 261 configured as a main controller executes calculations necessary for controlling the engine 100. The calculations necessary for controlling the engine 100 include, for example, calculations related to control of fuel injection and calculations related to stopping the engine 100. The second controller 262 configured as a sub-controller is connected to the first controller 261 by a communication line (not shown) and is provided so as to be able to communicate with the first controller 261. The second controller 262 performs control operations according to instructions from the first controller 261.

[0036] The first controller 261 controls the right injector 8R arranged in the right bank RB. That is, the first controller 261 and each right injector 8R are electrically connected. The second controller 262 controls the left injector 8L arranged in the left bank LB. That is, the second controller 262 and each left injector 8L are electrically connected.

[0037] In addition, the fuel pump 27 pressurizes the fuel and discharges it toward a high-pressure fuel pipe (not shown) for the right bank RB and a high-pressure fuel pipe (not shown) for the left bank LB. The fuel passing through the high-pressure fuel pipe for the right bank RB is distributed to each right injector 8R arranged in the right bank RB. The fuel passing through the high-pressure fuel pipe for the left bank LB is distributed to each left injector 8L arranged in the left bank LB. Each injector 8 injects fuel into the combustion chamber under the control of the controller 26.

[0038] <2. Details of the layout of intake and exhaust system components> Fig. 5 is a schematic perspective view showing components constituting the intake and exhaust systems of the engine 100 shown in Fig. 1. As shown in Fig. 5, the components constituting the intake system of the engine 100 include the left and right superchargers 23, the left and right first intake communication pipes 28, the intercooler 25, and the left and right intake manifolds 21.

[0039] The right first intake air communication pipe 28R connects the compressor section 231 of the right turbocharger 23R and the intercooler 25. The intake air supplied from the compressor section 231 of the right turbocharger 23R enters the intercooler 25 via the right first intake air communication pipe 28R. The left first intake air communication pipe 28L connects the compressor section 231 of the left turbocharger 23L and the intercooler 25. The intake air supplied from the compressor section 231 of the left turbocharger 23L enters the intercooler 25 via the left first intake air communication pipe 28L. In particular, the right first intake air communication pipe 28R and the left first intake air communication pipe 28L are connected to different positions of the intercooler 25.

[0040] Components constituting the exhaust system of the engine 100 include the left and right exhaust manifolds 22, the left and right exhaust connection pipes 29, the left and right turbochargers 23, and the left and right exhaust outlet pipes 24. The right exhaust connection pipe 29R connects the rear end of the right exhaust manifold 22R to the turbine section 232 of the right turbocharger 23R. The exhaust gas that has passed through the right exhaust manifold 22R enters the turbine section 232 of the right turbocharger 23R via the right exhaust connection pipe 29R. The left exhaust connection pipe 29L connects the rear end of the left exhaust manifold 22L to the turbine section 232 of the left turbocharger 23L. The exhaust gas that has passed through the left exhaust manifold 22L enters the turbine section 232 of the left turbocharger 23L via the left exhaust connection pipe 29L.

[0041] Fig. 6 is a schematic plan view seen from the rear with the turbocharger 23 and some of the parts around the turbocharger 23 removed from the view shown in Fig. 5. Fig. 7 is a schematic plan view seen from above with the turbocharger 23 and some of the parts around the turbocharger 23 removed from the view shown in Fig. 5. Fig. 8 is a schematic plan view seen from the right side with the turbocharger 23 and some of the parts around the turbocharger 23 removed from the view shown in Fig. 5. Note that some of the parts around the turbocharger 23 are pipes connected to the turbocharger 23. The pipes include the first intake communication pipe 28, the exhaust communication pipe 29, and the exhaust outlet pipe 24 described above.

[0042] In Fig. 6, Fig. 7, and Fig. 8, a rectangular frame W indicated by a dashed line indicates the approximate positions where the left and right superchargers 23 are disposed. The dashed line S indicated in Fig. 6 and Fig. 7 indicates a plane that includes the center line C of the crankshaft 6 and is perpendicular to the left-right direction. Hereinafter, this plane S will be simply referred to as the center plane S. Also, in Fig. 6, Fig. 7, and Fig. 8, an area ER surrounded by a dashed line is an extension area obtained by extending the area of ​​the exhaust manifold 22 rearward. The extension area ER is an area that coincides with the area of ​​the exhaust manifold 22 in a plan view from the crankshaft direction, and is an area that extends rearward from the exhaust manifold 22. Note that the shape of the extension area ER indicated in Fig. 6, Fig. 7, and Fig. 8 is a simplified shape, not an accurate shape.

[0043] As shown in Figs. 5 to 8, the two exhaust manifolds 22R, 22L of the engine 100 are provided for the two cylinder rows 111R, 111L, respectively, and are arranged on the side opposite to the side facing the in-bank area 200 located between the two cylinder rows 111R, 111L. As described above, the right cylinder row 111R constitutes the right bank RB, and the left cylinder row 111L constitutes the left bank LB (see Fig. 2). In other words, the engine 100 includes the exhaust manifolds 22R, 22L arranged on the side opposite to the in-bank area 200 of the cylinder rows 111R, 111L. The side opposite to the in-bank area 200 is the side opposite to the side facing the in-bank area 200.

[0044] Specifically, the right exhaust manifold 22R is disposed on the right side of the engine 100, opposite the side facing the in-bank area 200, with respect to the right cylinder row 111R. More specifically, the right exhaust manifold 22R is attached to a plurality of right head blocks 4R (see FIG. 2) that constitute the right bank RB. The left exhaust manifold 22L is disposed on the left side of the engine 100, opposite the side facing the in-bank area 200, with respect to the left cylinder row 111L. More specifically, the left exhaust manifold 22L is attached to a plurality of left head blocks 4L (see FIG. 2) that constitute the left bank LB.

[0045] The right exhaust manifold 22R and the left exhaust manifold 22L are disposed in positions that are approximately symmetrical with respect to the center plane S. The right exhaust manifold 22R and the left exhaust manifold 22L are at the same height position in the up-down direction (see FIG. 6). The right exhaust manifold 22R and the left exhaust manifold 22L are slightly misaligned in the front-to-rear direction. In detail, the left exhaust manifold 22L is disposed slightly rearward of the right exhaust manifold 22R (see FIG. 7).

[0046] The right exhaust communication pipe 29R is disposed rearward of the right exhaust manifold 22R. In other words, at least a portion of the right exhaust communication pipe 29R is disposed in the extension area ER of the right exhaust manifold 22R. The left exhaust communication pipe 29L is disposed rearward of the left exhaust manifold 22L. In other words, at least a portion of the left exhaust communication pipe 29L is disposed in the extension area ER of the left exhaust manifold 22L.

[0047] The intercooler 25 included in the engine 100 is disposed on one side of the two cylinder rows 111R, 111L in the crankshaft direction. More specifically, the intercooler 25 is disposed rearward of the two cylinder rows 111R, 111L (see FIG. 2). The intercooler 25 is disposed outside the intra-bank area 200. The intercooler 25 is disposed above the two exhaust manifolds 22R, 22L. In other words, the intercooler 25 is disposed above the extension area ER of the two exhaust manifolds 22R, 22L (see FIG. 8).

[0048] The two superchargers 23R, 23L of the engine 100 are provided for each of the two cylinder rows 111R, 111L. That is, one supercharger 23 is provided for each of the two cylinder rows 111R, 111L. The two superchargers 23R, 23L are connected to the intercooler 25. Although each of the two superchargers 23R, 23L may be directly connected to the intercooler 25, in this embodiment, as a preferred embodiment, the two superchargers 23R, 23L are indirectly connected to the intercooler 25 via a first intake communication pipe 28. At least a portion of each of the two superchargers 23R, 23L is disposed on an extension region ER on one side of the exhaust manifolds 22R, 22L in the crankshaft direction, or between the extension region ER and the intercooler 25.

[0049] With this configuration, exhaust gas can be guided from each of the two exhaust manifolds 22R, 22L to the turbine section 232 of each of the turbochargers 23R, 23L over a short distance. Also, intake air can be guided from each of the two turbochargers 23R, 23L to the intercooler 25 over a short distance. That is, by using a configuration including two turbochargers 23R, 23L, the performance of the engine 100 can be improved and the engine 100 can be made compact.

[0050] In this embodiment, as shown by dashed line frames W in Fig. 6, Fig. 7, and Fig. 8, at least a portion of each of the two turbochargers 23R, 23L is disposed in a space between the extension region ER of the exhaust manifolds 22R, 22L and the intercooler 25. The two turbochargers 23R, 23L are disposed at positions symmetrical with respect to the center plane S.

[0051] At least a portion of each of the two superchargers 23R, 23L is disposed between the extension region ER of the exhaust manifolds 22R, 22L and the intercooler 25 in the vertical direction in a side view from the left-right direction (see, for example, FIG. 8). In detail, at least a portion of the right supercharger 23R is disposed above the right exhaust communication pipe 29R disposed rearward of the right exhaust manifold 22R. Also, at least a portion of the left supercharger 23L is disposed above the left exhaust communication pipe 29L disposed rearward of the left exhaust manifold 22L.

[0052] In addition, it is preferable that the rear ends of the two turbochargers 23R, 23L do not protrude rearward as much as possible compared to the rear end of the intercooler 25 in a plan view from above. If they protrude rearward, the amount of protrusion is preferably less than half the length of the turbochargers 23R, 23L in the front-rear direction. It is more preferable that the rear ends of the two turbochargers 23R, 23L are located at the same position in the front-rear direction as the rear end of the intercooler 25 or further forward than the rear end of the intercooler 25 in a plan view from above.

[0053] In this embodiment, each of the two superchargers 23R, 23L is disposed outside the in-bank area 200 in a plan view from the crankshaft direction. As shown in Fig. 6, the right supercharger 23R is disposed to the right of the in-bank area 200 in a plan view from the crankshaft direction. The left supercharger 23L is disposed to the left of the in-bank area 200 in a plan view from the crankshaft direction.

[0054] The right exhaust outlet pipe 24R is disposed rearward of the turbine section 232 of the right turbocharger 23R (see FIG. 5). The left exhaust outlet pipe 24L is disposed rearward of the turbine section 232 of the left turbocharger 23L (see FIG. 5).

[0055] A turbocharger intake outlet 233 (see FIG. 5), which is an intake outlet of each of the turbochargers 23R, 23L, is disposed at the same position as at least a part of the intercooler 25 in the crankshaft direction. More specifically, the turbocharger intake outlet 233 is an intake outlet of the compressor section 231 of each of the turbochargers 23R, 23L. The turbocharger intake outlet 233 of the right turbocharger 23R is provided on the left side surface of the compressor section 231, and communicates with the right first intake communication pipe 28R connected to the intercooler 25. The turbocharger intake outlet 233 of the left turbocharger 23L is provided on the right side surface of the compressor section 231, and communicates with the left first intake communication pipe 28L connected to the intercooler 25.

[0056] Since the turbocharger intake outlets 233 of the two turbochargers 23R, 23L are disposed at the same position as at least a part of the intercooler 25 in the crankshaft direction, the length of the two first intake communication pipes 28R, 28L can be shortened. The intake air can be efficiently guided from each of the turbochargers 23R, 23L to the intercooler 25.

[0057] The intercooler 25 connected to the turbocharger 23 is shared by the two cylinder rows 111R, 111L. This allows the number of parts of the engine 100 to be reduced compared to a configuration in which an intercooler is provided for each cylinder row. This allows the cost of the engine 100 to be reduced. In addition, the engine 100 can be made more compact. In this embodiment, the intercooler 25 receives intake air from the two turbochargers 23R, 23L. However, the engine may be configured to have only one turbocharger, with the two cylinder rows sharing one turbocharger.

[0058] FIG. 9 is a schematic perspective view of the intercooler 25 included in the engine 100 according to the embodiment of the present invention. FIG. 9 is a view of the intercooler 25 as viewed from diagonally below to the right. The intercooler 25 is a liquid-cooled intercooler, and has a coolant inlet 251 which is an inlet for the coolant, and a coolant outlet 252 which is an outlet for the coolant. The coolant that enters the inside from the coolant inlet 251 passes through a heat exchanger (not shown) provided inside, and is discharged from the coolant outlet 252. In this embodiment, the coolant is cooling water. However, the coolant may be a liquid other than water, such as antifreeze. The antifreeze is, for example, a liquid obtained by mixing pure water and ethylene glycol at a predetermined ratio.

[0059] The intercooler 25 also has an intercooler intake inlet 253 which is an intake air inlet. In detail, the intercooler intake inlet 253 includes a right intercooler intake inlet 253R which communicates with the right first intake communication pipe 28R, and a left intercooler intake inlet 253L which communicates with the left first intake communication pipe 28L. The right intercooler intake inlet 253R is disposed on the right side of the lower surface of the intercooler 25. The left intercooler intake inlet 253L is disposed on the left side of the lower surface of the intercooler 25.

[0060] The intercooler intake inlet 253, which is an intake of the intercooler, is disposed above the supercharger intake outlet 233, which is an outlet of the intake of each of the superchargers 23R and 23L. As shown in FIG. 5, the right first intake communication pipe 28R connecting the supercharger intake outlet 233 portion of the right supercharger 23R and the right intercooler intake inlet 253R portion is curved. In detail, the right first intake communication pipe 28R has a curved portion that curves upward as it goes leftward. The left first intake communication pipe 28L connecting the supercharger intake outlet 233 portion of the left supercharger 23L and the left intercooler intake inlet 253L portion is curved. In detail, the left first intake communication pipe 28L has a curved portion that curves upward as it goes rightward. With this configuration, the assembly tolerance in the crankshaft direction can be easily absorbed, and the assembly of engine 100 can be improved.

[0061] Returning to Fig. 9, the intercooler 25 has an intercooler intake outlet 254 that discharges the intake air that has entered the intercooler 25 from the intercooler intake inlet 253 to the outside of the intercooler 25. The intake air that has entered the intercooler 25 from the intercooler intake inlet 253 exchanges heat with a heat exchange unit provided inside, and is discharged to the outside of the intercooler 25 from the intercooler intake outlet 254.

[0062] In detail, the intercooler intake outlet 254 includes a right intercooler intake outlet 254R arranged on the right side above the front surface of the intercooler 25, and a left intercooler intake outlet 254L arranged on the left side above the front surface of the intercooler 25. That is, the intercooler 25 has the intercooler intake outlets 254R, 254L, which discharge the intake air supplied from each of the two turbochargers 23 and entering the inside to the outside, on the side where the in-bank area 200 in the crankshaft direction is located. The right intercooler intake outlet 254R and the left intercooler intake outlet 254L are arranged symmetrically with respect to the center plane S (see FIG. 6, etc.).

[0063] Fig. 10 is a schematic perspective view showing two intake manifolds 21R, 21L included in the engine 100 according to the embodiment of the present invention. As shown in Fig. 10, each of the intake manifolds 21R, 21L has a rectangular parallelepiped intake manifold main body 211 and a plurality of intake air piping 212 extending downward from the intake manifold main body 211.

[0064] An intake manifold intake inlet 213, which is an intake air inlet, is provided on the rear surface of the intake manifold main body 211. An intake manifold intake outlet 214, which communicates with an intake port 41 (see FIG. 2) provided in the head block 4, is provided at the lower end of each intake air piping 212. In this embodiment, there are six cylinders on each of the left and right sides, and the right intake manifold 21R and the left intake manifold 21L each have six intake air pipings 212.

[0065] The right intake manifold 21R and the left intake manifold 21L are positioned approximately symmetrically with respect to the center plane S. The right intake manifold 21R and the left intake manifold 21L are at the same height in the up-down direction. The right intake manifold 21R and the left intake manifold 21L are slightly misaligned in the front-to-rear direction. In detail, the left intake manifold 21L is positioned slightly forward of the right intake manifold 21R (see FIG. 7).

[0066] It is preferable that at least a portion of the intake manifold 21 included in the engine 100 is disposed in the intra-bank area 200. It is preferable that at least a portion of the two intake manifolds 21R, 21L provided for the two cylinder rows 111R, 111L are disposed in the intra-bank area 200. In this embodiment, a portion of each of the two intake manifolds 21R, 21L is disposed in the intra-bank area 200. In detail, a portion of the intake air piping 212 is disposed in the intra-bank area 200, and the intake manifold main body 211 is disposed above the intra-bank area 200.

[0067] The intake manifold 21 is connected to the intake outlet portion (intercooler intake outlet 254 portion) of the intercooler 25. In detail, the right intercooler intake outlet 254R portion and the intake manifold intake inlet 213 portion of the right intake manifold 21R are connected by a right second intake communication pipe 30R (see FIG. 7, etc.). That is, the right intercooler intake outlet 254R and the intake manifold intake inlet 213 of the right intake manifold 21R communicate with each other via the right second intake communication pipe 30R. The left intercooler intake outlet 254L portion and the intake manifold intake inlet 213 portion of the left intake manifold 21L are connected by a left second intake communication pipe 30L (see FIG. 7, etc.). That is, the left intercooler intake outlet 254L and the intake manifold intake inlet 213 of the left intake manifold 21L communicate with each other via the left second intake communication pipe 30L.

[0068] The intake air entering the intercooler 25 from the turbocharger 23 reaches the intake manifold intake inlet 213 arranged above the in-bank area 200 from the intercooler intake outlet 254 via the second intake communication pipe 30. The intake air entering the intake manifold main body 211 from the intake manifold intake inlet 213 is distributed to each intake port 41 by a plurality of intake air piping 212 and supplied to each combustion chamber. Since the intercooler intake outlet 254 is provided on the side of the intercooler 25 where the in-bank area 200 exists in the crankshaft direction, the intake air can be guided from the intercooler 25 to the intake manifold 21 over a short distance. That is, according to the engine 100 of this embodiment, it is possible to guide the intake air from the turbocharger 23 to the intake manifold 21 over a short distance.

[0069] The intake inlet of the intercooler 25 (intercooler intake inlet 253) is disposed below the intercooler 25. The intake outlet of the intercooler 25 (intercooler intake outlet 254) is disposed above the intercooler 25. In this embodiment, the intake manifold 21 is disposed inside a V-bank formed by the right bank RB and the left bank LB, and the exhaust manifold 22 is disposed outside the V-bank. In this configuration, the intake manifold 21 into which the intake air enters from the intercooler 25 is disposed at a higher position than the exhaust manifold 22. For this reason, the intake inlet 253 is provided below the intercooler 25, and the intake outlet 254 is provided above the intercooler 25, so that the intake flow path can be configured naturally. That is, the engine 100 can be easily made compact.

[0070] <3. Details of the intercooler> Fig. 11 is a first cross-sectional perspective view showing a schematic configuration of an intercooler 25 provided in an engine 100 according to an embodiment of the present invention. Fig. 12 is a second cross-sectional perspective view showing a schematic configuration of an intercooler 25 provided in an engine 100 according to an embodiment of the present invention. The cross sections are cut at positions different from the first and second cross sections. Fig. 11 is a view showing a cross section cut along a plane perpendicular to the left-right direction. Fig. 12 is a view showing a cross section cut along a plane perpendicular to the front-rear direction.

[0071] As shown in FIGS. 9, 11 and 12, the intercooler 25 includes an intercooler main body 250, a heat exchange section 255, a first intercooler lid section 256 and a second intercooler lid section 257.

[0072] The intercooler main body 250 is cylindrical and extends in the left-right direction. An intercooler intake inlet 253 is provided on the lower surface of the intercooler main body 250. More specifically, a right intercooler intake inlet 253R is provided on the right side of the lower surface of the intercooler main body 250, and a left intercooler intake inlet 253L is provided on the left side of the lower surface. An intercooler intake outlet 254 is provided on the upper front surface of the intercooler main body 250. More specifically, a right intercooler intake outlet 254R is provided on the right side of the upper front surface of the intercooler main body 250, and a left intercooler intake outlet 254L is provided on the left side of the upper front surface.

[0073] The heat exchanger 255 is disposed in the intercooler body 250. The heat exchanger 255 has a plurality of tubes 2551 through which a coolant flows. The plurality of tubes 2551 extend in the left-right direction. A pair of end holders 2552 that collectively hold the plurality of tubes 2551 are disposed at the left and right ends of the plurality of tubes 2551. The plurality of tubes 2551 are held by the pair of end holders 2552 with the left and right end faces open. The plurality of tubes 2551 are held in a bundle by the pair of end holders 2552. The area occupied by the bundled plurality of tubes 2551 spreads in an in-plane direction that is parallel to the up-down direction and the front-rear direction. The bundled plurality of tubes 2551 spreads from the front end to the rear end of the internal space 2501 of the intercooler body 250 (see FIG. 11).

[0074] Each of the pair of end holding portions 2552 is provided in a plate shape. Of the pair of end holding portions 2552, the end holding portion 2552 arranged on the right closes the right end face of the intercooler body 250. Of the pair of end holding portions 2552, the end holding portion 2552 arranged on the left closes the left end face of the intercooler body 250. The multiple pipes 2551 extend from the left end to the right end of the intercooler body 250.

[0075] In this embodiment, an intermediate support portion 2553 that supports intermediate portions of the multiple pipes 2551 in the left-right direction is disposed in the internal space 2501 of the intercooler body 250. The intermediate support portion 2553 is plate-shaped and contacts the intercooler body 250. The multiple pipes 2551 penetrate the intermediate support portion 2553. In this embodiment, two intermediate support portions 2553 are provided with an interval therebetween in the left-right direction. However, the number of intermediate support portions 2553 may be changed as appropriate. In some cases, the intermediate support portion 2553 may not be provided.

[0076] First intercooler lid portion 256 is disposed on the left side of intercooler body 250, and covers, from the left side, the end portion holding portion 2552 disposed on the left side of the pair of end portion holding portions 2552. First intercooler lid portion 256 has therein a partition portion 2561 that divides the internal space into upper and lower portions.

[0077] The space below the partition portion 2561 constitutes the above-mentioned coolant inlet 251. The coolant inlet 251 faces left end surfaces of some of the multiple tubes 2551. For example, the left end surfaces of the tubes 2551 arranged in the lower half of the multiple tubes 2551 face the coolant inlet 251.

[0078] The space above the partition portion 2561 constitutes the above-mentioned coolant outlet 252. The coolant outlet 252 faces the left end surfaces of the remaining tubes 2551, excluding some of the tubes 2551 that face the coolant inlet 251, among the multiple tubes 2551. For example, the left end surfaces of the tubes 2551 arranged in the upper half of the multiple tubes 2551 face the coolant outlet 252.

[0079] The second intercooler lid portion 257 is disposed on the right side of the intercooler main body 250, and covers the end portion holding portion 2552 disposed on the right side of the pair of end portion holding portions 2552 from the right side. The second intercooler lid portion 257 is cup-shaped and opens to the left. All right end faces of the multiple tubes 2551 face the internal space of the second intercooler lid portion 257 attached to the intercooler main body 250. Hereinafter, this internal space will be referred to as a folded portion 2571 in view of its function. The folded portion 2571 will be described in detail later.

[0080] Fig. 13 is a diagram for explaining the flow of coolant and intake air in the intercooler 25 included in the engine 100 according to the embodiment of the present invention. Fig. 13 is a diagram showing the same cross section as Fig. 12, viewed from rear to front. In Fig. 13, the outline arrows indicate the flow of coolant. In Fig. 13, the thick arrows indicate the flow of intake air from the turbocharger 23. The intercooler 25 has a coolant flow path P1 through which the coolant flows, and an intake air flow path P2 through which the intake air from the turbocharger 23 flows.

[0081] In detail, the coolant flow path P1 has a coolant inlet (coolant inlet 251) and an outlet (coolant outlet 252) on one side in a first direction along which the coolant flows. With this configuration, the coolant can travel back and forth in the first direction at least once inside the intercooler 25. As a result, it is possible to make it difficult for a temperature difference to occur in the temperature of the intake air that passes through the intercooler 25 and is distributed to the two cylinder rows 111R, 111L. This point will be described in detail later.

[0082] The first direction along the flow of the coolant is specifically a direction along the main flow of the coolant, and is a left-right direction in this embodiment. In this embodiment, one side of the first direction is the left side, and the other side is the right side.

[0083] In this embodiment, the coolant entering from the coolant inlet 251 passes through the turn-back portion 2571 disposed on the other side in the first direction and reaches the coolant outlet 252. In detail, the coolant entering from the coolant inlet 251 flows rightward through the inside of the multiple pipes 2551 facing the coolant inlet 251 and reaches the turn-back portion 2571. The coolant that reaches the turn-back portion 2571 flows leftward through the inside of the multiple pipes 2551 facing the coolant outlet 252 and reaches the coolant outlet 252, and is discharged to the outside of the intercooler 25. That is, in this embodiment, the coolant moves back and forth in the left-right direction (first direction) only once inside the intercooler 25. With such a configuration, it is possible to prevent the inside of the intercooler 25 from becoming complicated.

[0084] As can be seen from the above, in this embodiment, the coolant flow path P1 is composed of the coolant inlet 251, the multiple pipes 2551, the folded portion 2571, and the coolant outlet 252.

[0085] Moreover, the intake passage P2 has an intake inlet (intercooler intake inlet 253) on one side in the second direction along the flow of intake air from the turbocharger 23, and an intake outlet (intercooler intake outlet 254) on the other side. In this configuration, since the intake inlet and outlet are on opposite sides, it is possible to easily disperse and arrange the components of the intake system around the intercooler 25.

[0086] The second direction along the intake air flow is specifically a direction along the main intake air flow, and is a vertical direction in this embodiment. In this embodiment, one side of the second direction is a lower side, and the other side is an upper side.

[0087] In this embodiment, the intake air flow path P2 is configured so that the intake air passes through one side and the other side in the second direction once. In detail, the intake air that enters the internal space 2501 of the intercooler main body 250 from the right intercooler intake inlet 253R and the left intercooler intake inlet 253L passes through the gaps between the plurality of pipes 2551 from the lower side of the heat exchanger 255 to the upper side of the heat exchanger 255. When passing through the gaps between the plurality of pipes 2551, the intake air is cooled by removing heat. The cooling liquid flowing inside the plurality of pipes 2551 removes heat from the intake air and is warmed. The intake air that has passed to the upper side of the heat exchanger 255 enters the right intake manifold 21R through the right intercooler intake outlet 254R and enters the left intake manifold 21L through the left intercooler intake outlet 254L. By making the flow of the intake air flow in one direction from the lower side to the upper side in this way, the inside of the intercooler 25 can be prevented from becoming complicated.

[0088] As can be seen from the above, in this embodiment, the intake flow path P2 is constituted by the intercooler intake inlet 253, the internal space 2501 of the intercooler main body 250, and the intercooler intake outlet 254.

[0089] In the intercooler 25 of this embodiment, the first direction and the second direction intersect. In detail, the coolant flows in the left-right direction and the intake air flows in the up-down direction, so that the two flows intersect. With this configuration, it is possible to configure the intake air from the turbocharger 23 to always pass through the heat exchanger 255 configured using the coolant flow path P1. Note that, in some cases, the first direction and the second direction may be the same direction.

[0090] The intake air entering the intercooler main body 250 from the right intercooler intake inlet 253R mainly passes through the right intercooler intake outlet 254R and enters the right intake manifold 21R. The intake air entering the intercooler main body 250 from the left intercooler intake inlet 253L mainly passes through the left intercooler intake outlet 254L and enters the left intake manifold 21L. The temperature of the coolant flowing through the coolant flow path P1 increases from the upstream (coolant inlet 251) to the downstream (coolant outlet 252). For this reason, the intake air entering the left intake manifold 21L mainly passes through a low-temperature portion where the temperature of the coolant is low and a high-temperature portion where the temperature of the coolant is high, and the intake air entering the right intake manifold 21R mainly passes through an intermediate-temperature portion where the temperature of the coolant is intermediate between the high-temperature portion and the low-temperature portion. As a result, the amount of thermal energy removed by the coolant can be made approximately the same between the intake air sent to the right intake manifold 21R connected to the right cylinder bank 111R and the intake air sent to the left intake manifold 21L connected to the left cylinder bank 111L. In other words, it is possible to suppress a difference in the adjustment of the intake air temperature by the intercooler 25 between the right cylinder bank 111R and the left cylinder bank 111L.

[0091] A partition wall may be disposed inside the intercooler main body 250 to divide the internal space 2501 of the intercooler main body 250 into a right chamber and a left chamber. In this manner, all of the intake air entering the intercooler main body 250 from the right intercooler intake inlet 253R can be guided to the right intercooler intake outlet 254R. Also, all of the intake air entering the intercooler main body 250 from the left intercooler intake inlet 253L can be guided to the left intercooler intake outlet 254L. In this manner, it is possible to easily stabilize the temperature of the intake air sent to each of the left and right intake manifolds 21.

[0092] In the present embodiment, the heat exchanger 255 configured using the coolant flow path P1 of the intercooler 25 is configured to have a multi-tube cooling structure having a plurality of tubes 2551 extending in the first direction. With such a configuration, high cooling efficiency can be obtained. However, the heat exchanger of the intercooler 25 may be configured to have a structure other than the multi-tube cooling structure.

[0093] In addition, in this embodiment, the intake passage P2 is configured such that the intake air passes through one side (lower side) and the other side (upper side) in the second direction (vertical direction) once, but may be configured differently. Fig. 14 is a schematic diagram showing the configuration of an intercooler 25A of a modified example.

[0094] The intercooler 25A of the modified example also includes an intercooler main body 250A, a heat exchanger 255A, a first intercooler lid 256A, and a second intercooler lid 257A, similar to the above-mentioned embodiment. The intercooler main body 250A has left and right intercooler intake inlets 253A and left and right intercooler intake outlets 254A. The first intercooler lid 256A has a coolant inlet 251A and a coolant outlet 252A. The second intercooler lid 257A has a folded portion 2571A. In FIG. 14, the thick arrows indicate the flow of intake air.

[0095] As shown in FIG. 14, the intake air that enters the intercooler main body 250 through the intercooler intake inlet 253A may be configured to turn back toward one side and then turn back to the other side at least once in the second direction before exiting to the outside through the intercooler intake outlet 254.

[0096] 14, the intake air turns back twice in the second direction, but may turn back an even number of times, which is more than two. In the above-described embodiment, the intake air turns back zero times.

[0097] 14, a partition wall 258 is provided in intercooler body 250A to divide internal space 2501A into a left chamber and a right chamber. That is, the intake air entering intercooler body 250A from right intercooler intake inlet 253RA is led to right intercooler intake outlet 254RA. Also, the intake air entering intercooler body 250A from left intercooler intake inlet 253LA is led to left intercooler intake outlet 254LA.

[0098] <4. Things to keep in mind> Various technical features disclosed in this specification can be modified in various ways without departing from the spirit of the technical creation. In other words, the above embodiment should be considered to be illustrative in all respects and not restrictive. In addition, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Explanation of symbols]

[0099] 21...Intake manifold 21L···Left intake manifold 21R···Right intake manifold 22...Exhaust manifold 22L···Left exhaust manifold 22R...Right exhaust manifold 23. Turbocharger 23L...Left turbocharger 23R...Right supercharger 25, 25A···Intercooler 100···Engine 111... cylinder row 111L: Left cylinder row 111R: Right cylinder row 200...Inside the bank area 251, 251A···Coolant inlet (coolant inlet) 252, 252A···Coolant outlet (coolant outlet) 253, 253A···Intercooler intake (intake) 253L, 253LA... Left intercooler intake inlet 253R, 253RA Right intercooler intake 254, 254A···Intercooler intake outlet (intake outlet) 254L, 254LA... Left intercooler intake outlet 254R, 254RA Right intercooler intake outlet 255, 255A...Heat exchange section 2551...tube 2571, 2571A... Turn-around part P1...coolant flow path P2: Intake passage

Claims

1. An engine comprising: two cylinder rows arranged side by side in the left-right direction; A supercharger, an intercooler shared by the two cylinder rows and connected to the turbocharger; Equipped with The intercooler is a coolant flow path through which the coolant flows; an intake passage through which intake air from the turbocharger flows; having the cooling liquid flow path has an inlet and an outlet for the cooling liquid on one side in a first direction along the flow of the cooling liquid, the intake passage has an intake inlet on one side in a second direction along the flow of the intake air and an intake outlet on the other side; The first direction is a left-right direction of the engine.

2. The intercooler, A cylindrical main body portion extending in the left-right direction; a heat exchange unit configured using the cooling liquid flow path and held by a pair of holders disposed at left and right ends of the main body; a first cover portion disposed on one side of the main body in a left-right direction and covering one of the pair of holding portions; a second cover portion disposed on the other side of the main body in the left-right direction and covering the other of the pair of holding portions; having the first cover portion has a space therein that forms an inlet and an outlet for the cooling liquid, The engine according to claim 1 , wherein the second cover portion has an internal space that forms a folded portion that directs the coolant that has entered from the coolant inlet through the heat exchange portion toward the coolant outlet.

3. The engine according to claim 1 or 2, wherein the intake passage is configured so that the intake air passes through one side and the other side in the second direction once.

4. 3. The engine according to claim 1, wherein the intake passage is configured such that after the intake air reaches from one side in the second direction to the other side, the intake air turns back toward one side in the second direction and then turns back toward the other side in the second direction at least once.

5. The engine according to claim 1 , wherein the first direction and the second direction intersect.

6. The supercharger is provided for each of the two cylinder rows, 6. An engine according to claim 1, wherein the intercooler is supplied with the intake air from two of the turbochargers.

7. an intake manifold, at least a portion of which is disposed in an area within a bank located between the two cylinder rows and connected to the intake outlet portion; an exhaust manifold disposed on a side of the row of cylinders opposite to the bank area; An engine according to any one of claims 1 to 6, comprising:

8. The intake inlet is disposed below the intercooler, 8. An engine according to claim 1, wherein the intake outlet is disposed above the intercooler.

9. 9. The engine according to claim 1, wherein a heat exchange portion of the intercooler formed using the coolant flow path has a multi-tube cooling structure in which a plurality of tubes extending in a left-right direction are bundled together.

Images