Engine

Abstract

To provide a technology suitable for an engine having a space between banks.SOLUTION: An illustrative engine includes two cylinder banks arranged side by side and each extending in a crankshaft direction, an intercooler disposed on one end side of the two cylinder banks in the crankshaft direction, and two intake manifolds provided for the two cylinder banks, respectively, and at least partially disposed in a bank inner area located between the two cylinder banks. Each of the two intake manifolds is elongated in an up-down direction in a front view from the crankshaft direction, and has an intake air inlet facing the intercooler on an end surface on one side in the crankshaft direction. The method of claim 1, further comprising: SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

[0002] Conventionally, a V-type engine having two rows of cylinders has been known (see, for example, Patent Document 1). In the V-type multi-cylinder engine disclosed in Patent Document 1, one turbocharger is arranged in the space between the banks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-228654 Summary of the Invention [Problem to be solved by the invention]

[0004] If the space between the banks can be used effectively, it is expected that there will be advantages such as making the engine more compact.

[0005] An object of the present invention is to provide a technique suitable for an engine having an inter-bank space. [Means for solving the problem]

[0006] An exemplary engine of the present invention includes two rows of cylinders arranged side by side and each extending in the crankshaft direction, an intercooler arranged at one end of the two rows of cylinders in the crankshaft direction, and two intake manifolds provided for the two rows of cylinders, at least a portion of which is arranged in an intra-bank area located between the two rows of cylinders. Each of the two intake manifolds extends elongatedly in the vertical direction when viewed from the front from the crankshaft direction, and has an intake inlet facing the intercooler at one end face in the crankshaft direction. [Effects of the Invention]

[0007] The exemplary invention provides a technique suitable for engines having interbank spacing. [Brief explanation of the drawings]

[0008] [Figure 1] Schematic perspective view showing the configuration of an engine [Figure 2] FIG. 1 is a schematic perspective view showing a portion of an engine that includes a cylinder block, a head block, and a head cover. [Figure 3] Schematic cross-sectional view of the cylinder block of the engine [Figure 4] Schematic top view showing the engine configuration [Figure 5] A schematic perspective view showing the components that make up the engine's intake and exhaust system. [Figure 6] 6 is a schematic plan view of the turbocharger and some of the components around the turbocharger removed from the view shown in FIG. 5, viewed from the rear. [Figure 7] A schematic plan view of the turbocharger and some of its peripheral components removed from the view shown in Figure 5, viewed from above. [Figure 8] 6 is a schematic plan view from the right side of the view shown in FIG. 5, with the turbocharger and some of its peripheral components removed. [Figure 9] Schematic perspective view of an intercooler provided in an engine [Figure 10] A schematic perspective view showing the two intake manifolds of the engine DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, exemplary embodiments 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 Cartesian 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 up side, and the -Z side is the down side. Specifically, the direction in which the center line C of the crankshaft (output shaft) shown in FIG. 1 extends is defined as the front-rear direction, and the side where the flywheel 2 is disposed relative to the cylinder block 1 is defined as the rear side. The up-down direction is defined as the side where the oil pan 3 is disposed relative to the cylinder block 1 is defined as the down side. The direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction, and the right side when viewed from the rear toward the front is defined as the right side, and the left side is defined as the left side. These directions are simply used for explanatory purposes and are not intended to limit the actual positional relationships and directions. 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 the configuration of an engine 100 according to an embodiment of the present invention. The engine 100 is suitable as a marine engine used in ships, for example. However, the engine 100 is not limited to being a marine engine and may be applied to other uses. 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 the 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 portion of cylinder block 1 that engine 100 includes.

[0012] As shown in Figures 2 and 3, a crankshaft 6 and pistons 7 extending in the front-to-rear direction are arranged inside the cylinder block 1. The interior of the cylinder block 1 is connected to the interior of an oil pan 3 arranged 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 pistons 7 are arranged inside cylinders 11 formed in the cylinder block 1. The pistons 7 are connected to the crankshaft 6 via connecting rods 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. When viewed from the rear, the right cylinder 11R is cylindrical and extends obliquely, tilting to the right with respect to the vertical direction. When viewed from the rear, the left cylinder 11L is cylindrical and extends obliquely, tilting to the left with respect to the vertical direction. 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 their cylinder axes slightly offset in the front-to-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. Specifically, the two cylinder rows 111R, 111L are arranged side by side in the left-right direction. 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 that make up the right cylinder row 111R and the number of left cylinders 11L that make up the left cylinder row 111L are both, for example, six. That is, the engine 100 of this embodiment is a V12 engine.

[0015] In each of the right cylinder row 111R and the left cylinder row 111L, a head block 4 is disposed over each cylinder 11. The head block 4 is fastened to the cylinder block 1 using screws. Specifically, the head block 4 includes a right head block 4R that is disposed over the right cylinder 11R and a left head block 4L that is disposed over the left cylinder 11L. Since one right head block 4R is disposed over each right cylinder 11R, there are the same number of right cylinders 11R. Since one left head block 4L is disposed over each left cylinder 11L, there are the same number of left cylinders 11L. In this embodiment, there are six right head blocks 4R and six left head blocks 4L.

[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. Specifically, the right head block 4R has the intake port 41 on its left side surface and an exhaust port on its right side surface. The left head block 4L has the 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 using screws. Each head cover 5 covers the intake valves and exhaust valves (not shown) arranged on the head block 4. An injector 8 is attached to each head cover 5. One end of the injector 8, where an injection port for injecting fuel is provided, faces the combustion chamber. The other end of the injector 8 protrudes from the head cover 5 toward the outside.

[0018] In detail, the head cover 5 includes a right head cover 5R that is placed over the right head block 4R and a left head cover 5L that is placed over the left head block 4L. The right head covers 5R are placed over each right head block 4R, so there are the same number of right head covers 5R as there are right head blocks 4R. The left head covers 5L are placed over each left head block 4L, so there are the same number of left head covers 5L as there are 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, right head block 4R, and right head cover 5R that constitute the right bank RB extend diagonally upward to the right. On the left side of the cylinder block 1, the left cylinder 11L, left head block 4L, and left head cover 5L that constitute the left bank LB extend diagonally upward to the left. In a plan view from the front-to-rear direction, the right bank RB and the left bank LB form a V-shape, and the engine 100 has a V-bank. An intra-bank area 200 is defined between the right bank RB and the left bank LB in the left-to-right direction.

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

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

[0022] The intake manifold 21 distributes intake air, which is air or an air-fuel mixture drawn in from the outside, to each cylinder 11. The intake manifold 21 is disposed on top of the engine 100 and extends in the front-to-rear direction. Specifically, 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. In other words, the engine 100 has 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-to-rear direction. The interior of the right intake manifold 21R is connected to each right cylinder 11R via each intake port 41. The left intake manifold 21L is disposed above the intake ports 41 of the multiple left head blocks 4L aligned in the front-to-rear direction. The interior of the left intake manifold 21L is connected to each left cylinder 11L via each intake port 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 open, the inside of the intake manifold 21 and the cylinder 11 communicate with each other.

[0025] The exhaust manifold 22 collects exhaust gases from each cylinder 11. The exhaust manifold 22 is disposed on a side portion of the engine 100 and extends in the front-to-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) lined up in the front-rear direction. The interior of the right exhaust manifold 22R is connected to each right cylinder 11R via an exhaust port (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) lined up in the front-rear direction. The interior of the left exhaust manifold 22L is connected to each left cylinder 11L via an exhaust port (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 open, 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, which are disposed to 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, which are disposed to the left rear of the engine 100.

[0029] The right supercharger 23R and the left supercharger 23L each have a compressor unit 231 and a turbine unit 232. The compressor unit 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 unit 232 is rotated by exhaust gas supplied from the exhaust manifold 22. The rotational power of the turbine unit 232 is transmitted to the compressor unit 231. That is, the right supercharger 23R and the left supercharger 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 receives cooling water supplied 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 heat of compression and increasing its 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 in the left-right direction above 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 injectors 8, and the like are arranged.

[0032] That is, engine 100 includes controller 26 disposed in intra-bank area 200 located between right cylinder row 111R and left cylinder row 111L. Engine 100 also includes fuel pump 27 disposed in intra-bank area 200. Strictly speaking, intra-bank area 200 may also refer to the spatial region between right cylinder row 111R and left cylinder row 111L. However, in this embodiment, intra-bank area 200 broadly includes the spatial region between right bank RB, which includes right cylinder row 111R, and left bank LB, which includes 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 used efficiently for arranging parts, thereby contributing to the downsizing 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 aligned 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 the 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 the 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 in accordance with 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] The fuel pump 27 also 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 a combustion chamber under the control of the controller 26.

[0038] <2. Details of the arrangement of intake and exhaust system components> Fig. 5 is a schematic perspective view showing the 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 supercharger 23R and the intercooler 25. The intake air supplied from the compressor section 231 of the right supercharger 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 supercharger 23L and the intercooler 25. The intake air supplied from the compressor section 231 of the left supercharger 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 on the intercooler 25.

[0040] The components that make up the exhaust system of the engine 100 include left and right exhaust manifolds 22, left and right exhaust communication pipes 29, left and right turbochargers 23, and left and right exhaust outlet pipes 24. The right exhaust communication pipe 29R connects the rear end of the right exhaust manifold 22R to the turbine section 232 of the right turbocharger 23R. Exhaust gas that passes through the right exhaust manifold 22R enters the turbine section 232 of the right turbocharger 23R via the right exhaust communication pipe 29R. The left exhaust communication pipe 29L connects the rear end of the left exhaust manifold 22L to the turbine section 232 of the left turbocharger 23L. Exhaust gas that passes through the left exhaust manifold 22L enters the turbine section 232 of the left turbocharger 23L via the left exhaust communication pipe 29L.

[0041] Fig. 6 is a schematic plan view seen from the rear, with the turbocharger 23 and some of the components 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 components around the turbocharger 23 removed from the view shown in Fig. 5. Fig. 8 is a schematic plan view seen from the right, with the turbocharger 23 and some of the components around the turbocharger 23 removed from the view shown in Fig. 5. Note that some of the components 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 Figures 6, 7, and 8, a rectangular frame W indicated by a dashed line indicates the approximate positions where the left and right turbochargers 23 are disposed. The two-dot dashed line S in Figures 6 and 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 Figures 6, 7, and 8, the region ER surrounded by a dashed line is an extension region obtained by extending the region of the exhaust manifold 22 rearward. The extension region ER is a region that coincides with the region of the exhaust manifold 22 in a plan view from the crankshaft direction and extends rearward from the exhaust manifold 22. Note that the shape of the extension region ER shown in Figures 6, 7, and 8 is a simplified shape, not an accurate shape.

[0043] 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 disposed on the opposite side of the in-bank area 200 located between the two cylinder rows 111R, 111L. As described above, the right cylinder row 111R forms the right bank RB, and the left cylinder row 111L forms the left bank LB (see FIG. 2). The side opposite the in-bank area 200 is the side opposite 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. Even more specifically, the right exhaust manifold 22R is attached to multiple 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. Even more specifically, the left exhaust manifold 22L is attached to multiple 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 roughly symmetrical with respect to the center plane S. The right exhaust manifold 22R and the left exhaust manifold 22L are at the same height 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. More specifically, 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. In other words, the intercooler 25 is disposed on one end 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 region ER of the two exhaust manifolds 22R, 22L (see FIG. 8).

[0048] The two superchargers 23R, 23L included in the engine 100 are provided for the two cylinder rows 111R, 111L, respectively. The two superchargers 23R, 23L are connected to the intercooler 25. Note that although each of the two superchargers 23R, 23L may be directly connected to the intercooler 25, in this embodiment, as a preferred form, they 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 air 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 more compact.

[0050] In this embodiment, as shown by dashed line frames W in Figures 6, 7, and 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] In a side view from the left-right direction, 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 (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 behind the right exhaust manifold 22R. Furthermore, at least a portion of the left supercharger 23L is disposed above the left exhaust communication pipe 29L disposed behind the left exhaust manifold 22L.

[0052] 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 positioned at the same position as the rear end of the intercooler 25 in the front-rear direction 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 behind the turbine section 232 of the right supercharger 23R (see FIG. 5). The left exhaust outlet pipe 24L is disposed behind the turbine section 232 of the left supercharger 23L (see FIG. 5).

[0055] The turbocharger intake outlet 233 (see FIG. 5) 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. The turbocharger intake outlet 233 is an intake outlet of each of the turbochargers 23R, 23L. 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] The turbocharger intake outlets 233 of the two turbochargers 23R, 23L are disposed at the same position in the crankshaft direction as at least a part of the intercooler 25, so the lengths of the two first intake communication pipes 28R, 28L can be shortened. Intake air can be efficiently guided from each of the turbochargers 23R, 23L to the intercooler 25.

[0057] FIG. 9 is a schematic perspective view of the intercooler 25 included in the engine 100 according to an 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 through which the coolant enters and a coolant outlet 252 through which the coolant exits. The coolant that enters the interior through 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 in a predetermined ratio.

[0058] The intercooler 25 also has an intercooler intake inlet 253, which is an intake air inlet. More specifically, the intercooler intake inlet 253 includes a right intercooler intake inlet 253R that communicates with the right first intake communication pipe 28R, and a left intercooler intake inlet 253L that 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.

[0059] The intercooler intake inlet 253 of the intercooler 25 is disposed above the supercharger intake outlets 233 of each of the superchargers 23R and 23L. The intercooler intake inlet 253 is an intake inlet of the intercooler 25. As shown in FIG. 5 , the right first intake communication pipe 28R, which connects the supercharger intake outlet 233 of the right supercharger 23R and the right intercooler intake inlet 253R, has a curved shape. Specifically, the right first intake communication pipe 28R has a curved portion that curves upward as it extends leftward. The left first intake communication pipe 28L, which connects the supercharger intake outlet 233 of the left supercharger 23L and the left intercooler intake inlet 253L, has a curved shape. Specifically, the left first intake communication pipe 28L has a curved portion that curves upward as it extends rightward. By adopting such a configuration, it is possible to easily absorb assembly tolerances in the crankshaft direction, and the assembly of engine 100 can be improved.

[0060] Returning to Figure 9, the intercooler 25 has an intercooler intake outlet 254 that discharges the intake air that has entered the interior through the intercooler intake inlet 253 to the outside of the intercooler 25. The intake air that has entered the interior of the intercooler 25 through the intercooler intake inlet 253 exchanges heat with a heat exchange unit provided inside, and is then discharged to the outside of the intercooler 25 from the intercooler intake outlet 254.

[0061] In detail, the intercooler intake outlets 254 include 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 on the in-bank area 200 side in the crankshaft direction, through which the intake air that has entered the interior after being supplied from each of the two turbochargers 23 is discharged to the outside. 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.).

[0062] 10 is a schematic perspective view showing two intake manifolds 21R and 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 and 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.

[0063] 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 manifold 212. In this embodiment, there are six cylinders on each side, and the right intake manifold 21R and the left intake manifold 21L each have six intake manifolds 212.

[0064] 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 offset in the front-to-rear direction. More specifically, the left intake manifold 21L is positioned slightly forward of the right intake manifold 21R (see Figure 7).

[0065] It is preferable that at least a portion of each of the two intake manifolds 21R, 21L provided for each of the two cylinder rows 111R, 111L is located in the intra-bank area 200. In this embodiment, a portion of each of the two intake manifolds 21R, 21L is located in the intra-bank area 200. In particular, a portion of the intake air piping 212 is located in the intra-bank area 200, and the intake manifold main body 211 is located above the intra-bank area 200.

[0066] The right intercooler intake outlet 254R and the intake manifold intake inlet 213 of the right intake manifold 21R are connected by a right second intake communication pipe 30R (see Figure 7, etc.). That is, the right intercooler intake outlet 254R and the intake manifold intake inlet 213 of the right intake manifold 21R are in communication via the right second intake communication pipe 30R. The left intercooler intake outlet 254L and the intake manifold intake inlet 213 of the left intake manifold 21L are in communication by a left second intake communication pipe 30L (see Figure 7, etc.). That is, the left intercooler intake outlet 254L and the intake manifold intake inlet 213 of the left intake manifold 21L are in communication via the left second intake communication pipe 30L.

[0067] The intake air that enters the intercooler 25 from the turbocharger 23 flows from the intercooler intake outlet 254 through the second intake communication pipe 30 to the intake manifold intake inlet 213 located above the in-bank area 200. The intake air that enters the intake manifold main body 211 from the intake manifold intake inlet 213 is distributed to each intake port 41 by multiple intake air piping 212 and supplied to each combustion chamber. Because the intercooler intake outlet 254 is provided on the side of the intercooler 25 where the in-bank area 200 is located in the crankshaft direction, the intake air can be guided from the intercooler 25 to the intake manifold 21 over a short distance. In other words, with the engine 100 of this embodiment, the intake air can be guided from the turbocharger 23 to the intake manifold 21 over a short distance.

[0068] <3. 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-described embodiments should be considered to be illustrative in all respects and not restrictive. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Explanation of symbols]

[0069] 6. Crankshaft 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···Intercooler 100···Engine 111 cylinder row 111L... Left cylinder row 111R: Right cylinder row 200...Inside the bank area 233 Turbocharger intake outlet 253···Intercooler intake inlet 254···Intercooler intake outlet ER...extension area

Claims

1. two rows of cylinders arranged side by side and each row extending in the crankshaft direction; an intercooler disposed at one end side of each of the two cylinder rows in the crankshaft direction; two intake manifolds provided for the two cylinder rows, at least a portion of which is disposed in an area within the bank located between the two cylinder rows; Equipped with an engine, wherein each of the two intake manifolds extends elongatedly in the vertical direction when viewed from the front from the crankshaft direction, and has an intake inlet facing the intercooler on one end face in the crankshaft direction.

2. Each of the two intake manifolds has an intake manifold main body having a rectangular shape extending in the up-down direction when viewed from the front from the crankshaft direction and including the intake inlet; a plurality of intake air pipes extending downward from the intake manifold main body; 10. The engine of claim 1, wherein:

3. two superchargers provided for the two cylinder rows, respectively, and connected to the intercooler; two exhaust manifolds provided for the two cylinder rows, respectively, and disposed on the opposite side of the bank area; Equipped with 3. The engine according to claim 1, wherein at least a portion of each of the two superchargers is disposed on an extension region on one side of the exhaust manifold in the crankshaft direction, or between the extension region and the intercooler.

4. The engine according to claim 3 , wherein a supercharger intake outlet of each of the superchargers is disposed at the same position as at least a portion of the intercooler in the crankshaft direction.

5. The engine according to claim 3 or 4, wherein an intercooler intake inlet of the intercooler is disposed above a supercharger intake outlet of each of the superchargers.

6. 6. The engine according to claim 3, wherein the intercooler has an intercooler intake outlet, through which intake air supplied from each of the two turbochargers and entering the interior thereof is discharged to the outside, on a side of the bank area in the crankshaft direction.

Images