engine

Abstract

To provide a technology that can control an electrical wire arranged in an engine from being damaged.SOLUTION: An engine includes: an engine body including at least one cylinder row in which a plurality of cylinders is arrayed in a longitudinal direction; an air supply pipe disposed on one side surface of the engine body and extending in the longitudinal direction; and a first electrical wire disposed downward the air supply pipe along the one side surface.SELECTED DRAWING: Figure 6A

Description

[Technical Field]

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

[0002] Conventionally, engines are equipped with electrical components such as injectors, alternators, starters, and various sensors. Furthermore, engines equipped with electrical components are also equipped with power lines for transmitting electric power and signal lines for transmitting signals.

[0003] For example, Patent Document 1 discloses an engine equipped with a plurality of wire harnesses. The plurality of wire harnesses are supported and protected by a wire harness cover attached to an intake manifold. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-183565 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, when performing maintenance on large engines used in power generation or ships, maintenance workers may place their feet on components that make up the engine. For this reason, if a harness is attached to a component that is easy to place your feet on, the harness may be unintentionally damaged during the work.

[0006] Furthermore, various measures are required to prevent damage to the harnesses provided in the engine, such as preventing damage from hot air emitted from high-temperature parts that make up the engine.

[0007] An object of the present invention is to provide a technique that can prevent damage to electric wires arranged in an engine. [Means for solving the problem]

[0008] An exemplary engine of the present invention includes an engine body having at least one cylinder row in which a plurality of cylinders are arranged in the fore-and-aft direction, an air intake pipe arranged on one side of the engine body and extending in the fore-and-aft direction, and a first electric wire arranged below the air intake pipe and along the one side. [Effects of the Invention]

[0009] According to the exemplary embodiment of the present invention, damage to the electric wires arranged in the engine can be suppressed. [Brief explanation of the drawings]

[0010] [Figure 1] Left side view showing the general configuration of the engine [Figure 2] A front view showing the general configuration of the engine [Figure 3] FIG. 1 is a plan view showing a schematic configuration of an engine. [Figure 4] Schematic diagram for explaining an injector provided in an engine [Figure 5] FIG. 1 is a perspective view showing a schematic configuration of an electrical system provided in an engine; [Figure 6A] A diagram showing the location of the wire harness on the left side of the engine [Figure 6B] Schematic diagram showing a part of a cross section taken along the line AA in FIG. 6A. [Figure 7] A diagram showing the location of the high-voltage power supply wire harness on the rear of the engine. [Figure 8] A diagram showing the location of the wire harness on the right side of the engine DETAILED DESCRIPTION OF THE INVENTION

[0011] 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 shown as a three-dimensional Cartesian coordinate system where appropriate. 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. Note that the +X side is the front side and the -X side is the rear side. The +Y side is the left side and the -Y side is the right side. The +Z side is the up side and the -Z side is the down side. Specifically, the front-rear direction is the direction along which the center line J of the crankshaft (output shaft) shown in FIG. 1 extends. The front side is the side on which the cylinder block 11 is disposed relative to the flywheel 3a (see FIG. 7) housed in the flywheel housing 3. The up-down direction is defined as the side on which the oil pan 2 is disposed relative to the cylinder block 11. The left-right direction is defined as the direction perpendicular to the front-rear direction and the up-down direction, and the left side is the left side when viewed from the front to the rear, and the right side is the right side. Note that these directions are names used merely for explanation and are not intended to limit the actual positional relationships or directions.

[0012] <1. Engine Overview> Fig. 1 is a left side view showing a schematic configuration of an engine 100 according to an embodiment of the present invention. Fig. 2 is a front view showing a schematic configuration of an engine 100 according to an embodiment of the present invention. Fig. 3 is a plan view showing a schematic configuration of an engine 100 according to an embodiment of the present invention. An overview of the engine 100 will be described mainly with reference to Figs. 1 to 3.

[0013] The engine 100 is not intended to be particularly limited, but may be, for example, an engine used for generating electricity or a marine propulsion engine used for propelling a marine vessel. The engine 100 is a large engine. The engine 100 is a diesel engine. The engine 100 generally comprises an engine body 1 and an oil pan 2. The engine body 1 comprises a cylinder block 11, a head block 12, and a head cover 13.

[0014] Inside the cylinder block 11, there are disposed a plurality of pistons (not shown) and a crankshaft (not shown) that is connected to each piston and extends in the front-to-rear direction. The crankshaft converts the reciprocating motion of the pistons into rotational motion. A flywheel 3a (see FIG. 7, described later) housed in a flywheel housing 3 is attached to the rear end of the crankshaft. The flywheel 3a rotates integrally with the crankshaft and is used to extract power from the engine 100.

[0015] The cylinder block 11 has a cylinder row 15 (see FIG. 4 described later) in which a plurality of cylinders 14 are aligned in the front-rear direction. That is, the engine body 1 has at least one cylinder row 15 in which a plurality of cylinders 14 are aligned in the front-rear direction. Each of a plurality of pistons is disposed in each cylinder 14. In detail, the cylinder block 11 has a cylinder row 15 on each of the left and right sides. The engine 100 is a V-engine having two cylinder rows 15 aligned in the left-right direction. Note that the engine 100 is, as an example, a V12 engine, and the number of cylinders 14 aligned in the front-rear direction on each of the left and right sides is six.

[0016] The head blocks 12 are stacked above each cylinder 14. That is, the engine body 1 has six head blocks 12 lined up in the front-to-rear direction on each of the left and right sides. Each head block 12 has an intake port (not shown) for supplying gas to a combustion chamber formed by the cylinder 14, head block 12, and piston, and an exhaust port (not shown) for exhausting gas from the combustion chamber.

[0017] A head cover 13 is disposed above each head block 12. That is, the engine body 1 has six head covers 13 arranged in the front-to-rear direction on each of the left and right sides. Each head cover 13 covers an intake valve and an exhaust valve (not shown) disposed on the head block 12. An injector 16 (see FIG. 4 described later) is attached to each head cover 13.

[0018] FIG. 4 is a schematic diagram illustrating an injector 16 provided in an engine 100 according to an embodiment of the present invention. To facilitate understanding of the injector 16, FIG. 4 also shows a cylinder block 11 having cylinders 14. Hereinafter, of the cylinder banks 15 provided in the engine 100, the cylinder bank 15 on the left side of the engine 100 will be referred to as a left cylinder bank 15L, and the cylinder bank 15 on the right side will be referred to as a right cylinder bank 15R. One injector 16 is provided for each cylinder 14 constituting the left cylinder bank 15L. Similarly, one injector 16 is provided for each cylinder 14 constituting the right cylinder bank 15R. Hereinafter, the injector 16 provided corresponding to the left cylinder bank 15L will be referred to as a left injector 16L, and the injector 16 provided corresponding to the right cylinder bank 15R will be referred to as a right injector 16R. In this embodiment, there are six left injectors 16L and six right injectors 16R.

[0019] One end (lower end) of each injector 16, where an injection port for injecting fuel is provided, faces the combustion chamber. Each injector 16 injects fuel supplied via high-pressure fuel pipe 32 from a fuel pump 4, which discharges fuel at high pressure, into the combustion chamber at appropriate timing. The pistons reciprocate due to the force generated by the combustion of the fuel injected into the combustion chamber. In this embodiment, the fuel pump 4 is disposed rearward on the left side of the engine 100 (see FIG. 1).

[0020] The left cylinder bank 15L, head block 12, and head cover 13 provided on the left side of the engine 100 constitute a left bank LB. The right cylinder bank 15R, head block 12, and head cover 13 provided on the right side of the engine 100 constitute a right bank RB.

[0021] The engine 100 also includes an intake manifold (intake pipe) 5 and an exhaust manifold (exhaust pipe) 6.

[0022] The intake manifold 5 distributes intake air, which is air or an air-fuel mixture supplied from a turbocharger 7, the details of which will be described later, to each cylinder 14 (combustion chamber). Specifically, one intake manifold 5 is arranged on each of the left and right side surfaces of the engine body 1, corresponding to the cylinder rows 15 arranged on the left and right sides. Both of the intake manifolds 5 arranged on the left and right extend in the front-to-rear direction. That is, the engine 100 is provided with an intake manifold (intake pipe) 5 arranged on one side surface of the engine body 1 and extending in the front-to-rear direction. Note that in this embodiment, the engine 100 further includes an intake manifold (intake pipe) 5 arranged on the other side surface of the engine body 1 and extending in the front-to-rear direction. The other side surface is the side surface opposite to the one side surface across the crankshaft.

[0023] Hereinafter, the intake manifold 5 provided on the left side of the engine 100 corresponding to the left cylinder bank 15L will be referred to as the left intake manifold 5L. The intake manifold 5 provided on the right side of the engine 100 corresponding to the right cylinder bank 15R will be referred to as the right intake manifold 5R. The left intake manifold 5L and the right intake manifold 5R are disposed outside the V-bank formed by the left bank LB and the right bank RB.

[0024] The exhaust manifold 6 collects exhaust gas from each cylinder (combustion chamber). The exhaust manifold 6 is disposed between a left bank LB and a right bank RB, extending in the front-to-rear direction. That is, the engine 100 includes the exhaust manifold (exhaust pipe) 6 disposed in an inter-bank area VA between a first bank including one of the two cylinder rows 15L, 15R and a second bank including the other. One of the first bank and the second bank is the left bank LB, and the other is the right bank RB.

[0025] More specifically, two exhaust manifolds 6 are arranged corresponding to the cylinder banks 15 arranged on the left and right sides. Both exhaust manifolds 6 extend in the front-to-rear direction. The two exhaust manifolds 6 are arranged side by side on the left and right sides inside a V-bank formed by a left bank LB and a right bank RB. Hereinafter, the exhaust manifold 6 arranged on the left side of the V-bank corresponding to the left cylinder bank 15L will be referred to as the left exhaust manifold 6L. The exhaust manifold 6 arranged on the right side of the V-bank corresponding to the right cylinder bank 15R will be referred to as the right exhaust manifold 6R.

[0026] The supercharger 7 is disposed at the rear upper portion of the engine 100. That is, the engine 100 is equipped with the supercharger 7. The supercharger 7 pressurizes and compresses air or an air-fuel mixture supplied from outside the engine 100, and supplies the compressed air to the intake manifold 5 via the intercooler 8. The supercharger 7 is a turbocharger that uses exhaust gas supplied from the exhaust manifold 6 as its driving source.

[0027] The intercooler 8 connected to the intake manifold 5 is supplied with coolant by driving a coolant pump 10, and cools the intake air. That is, the engine 100 is equipped with the intercooler 8 that cools the intake air from the turbocharger 7. The intercooler 8 is disposed on one side of the engine body 1 in the longitudinal direction. The intercooler 8 is disposed on one side of the inter-bank area VA in the longitudinal direction. More specifically, the intercooler 8 is disposed at one end of the engine body 1 and the inter-bank area VA. In this embodiment, the coolant is cooling water. 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.

[0028] The intake air supplied from the turbocharger 7 is pressurized and compressed, generating heat of compression and causing the temperature to rise. The intercooler 8 cools the intake air by exchanging heat between a coolant and the pressurized and compressed intake air. In other words, by providing the intercooler 8, the temperature of the intake air supplied to the intake manifold 5 can be adjusted to a desired temperature.

[0029] Specifically, the turbocharger 7 has a left turbocharger 7L provided on the left side of the engine 100 and a right turbocharger 7R provided on the right side of the engine 100. The left turbocharger 7L supplies air and the like (intake air) to the left intake manifold 5L via an intercooler 8. The right turbocharger 7R supplies air and the like (intake air) to the right intake manifold 5R via an intercooler 8. Exhaust gas collected in the left exhaust manifold 6L is exhausted to the outside via the left turbocharger 7L. Exhaust gas collected in the right exhaust manifold 6R is exhausted to the outside via the right turbocharger 7R.

[0030] The oil pan 2 is disposed below the cylinder block 11 and stores lubricating oil. The lubricating oil stored in the oil pan 2 is supplied to each part of the engine 100 that requires lubrication.

[0031] <2. Electrical System> Next, the electrical system 200 provided in the engine 100 will be described.

[0032] [2-1. Overview of the electrical system] Fig. 5 is a perspective view showing a schematic configuration of an electrical system 200 provided in the engine 100 according to an embodiment of the present invention. Fig. 5 is a diagram showing an extracted portion of the electrical system 200 provided in the engine 100. As shown in Fig. 5, the electrical system 200 includes an ECU (Engine Control Unit) 17, a junction box 18, an alternator 19, and a starter 20.

[0033] The ECU 17 controls the engine 100. For example, the ECU 17 controls fuel injection and starts and stops the engine 100. The ECU 17 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory).

[0034] The junction box 18 is a box that houses terminals, electric wires, etc. that connect the ECU 17 and each electrical component. The electrical components include, for example, the injector 16 and various sensors (not shown) that are disposed in the engine 100. In this embodiment, the junction box 18 is disposed in the upper left-hand portion of the front of the engine 100 (see FIG. 1). The ECU 17 is disposed immediately to the right of the junction box 18.

[0035] The alternator 19 is a generator that generates AC electricity using rotational power generated by the rotation of the crankshaft. The alternator 19 is connected to the crankshaft via a belt or the like (not shown). The alternator 19 supplies electric power to each component of the engine 100. The electric power generated by the alternator 19 is charged into a battery (not shown). In this embodiment, the alternator 19 is disposed near the front of the left side of the engine 100 (see FIG. 1).

[0036] The starter 20 receives power from a battery (not shown) and rotates the crankshaft when starting the engine 100. The starter 20 is configured with an electric actuator such as a motor. The starter 20 is connected to a flywheel 3a (see FIG. 3, described later) connected to the crankshaft via a gear (not shown) or the like. In this embodiment, the starter 20 is disposed behind the right side of the engine 100 (see FIG. 8, described later).

[0037] 5, the electrical system 200 includes multiple types of wire harnesses 21 to 23. The wire harnesses 21 to 23 are assembly components formed by bundling multiple electric wires according to wiring patterns. The multiple types of wire harnesses 21 to 23 include a high-voltage power supply wire harness 21, a low-voltage power supply wire harness 22, and a signal wire harness 23.

[0038] The high-voltage power supply wire harness 21 is a wire harness including electric wires for connecting the alternator 19 and the starter 20 to the battery. The low-voltage power supply wire harness 22 is a wire harness including electric wires for supplying power from the ECU 17 to each injector 16. The signal wire harness 23 is a wire harness including electric wires for transmitting signals from various sensors provided in the engine 100 to the ECU 17.

[0039] In detail, the low-voltage power supply wire harness 22 includes a wire harness for supplying power to the six left injectors 16L (see FIG. 4) and a wire harness for supplying power to the six right injectors 16R (see FIG. 4).

[0040] [2-2. Wire harness layout] Next, a detailed description will be given of the arrangement (routing) of the wire harnesses 21 to 23 in the engine 100. Fig. 6A is a diagram schematically showing the positions of the wire harnesses 21 to 23 on the left side of the engine 100. Fig. 6B is a schematic diagram showing a part of a cross section taken at position AA in Fig. 6A. Fig. 6B schematically shows the positions of the wire harnesses 21 to 23 in the engine 100.

[0041] As shown in FIGS. 6A and 6B, the engine 100 includes a high-voltage power supply wire harness 21 (shown by a thick solid line), at least a portion of which is spaced downward from the intake manifold (intake pipe) 5 and arranged along one side surface (left side surface) of the engine body 1. Note that "spaced downward from the intake pipe 5" may mean spaced directly below the intake pipe 5 or spaced diagonally downward from the intake pipe 5. The high-voltage power supply wire harness 21 includes a high-voltage wire through which electricity of a higher voltage flows than the other wire harnesses 22, 23. The high-voltage wire is an example of the first electric wire of the present invention. That is, the engine 100 includes a first electric wire that is spaced downward from the intake pipe 5 and along one side surface of the engine body 1.

[0042] For example, if engine 100 is a large engine, a worker may place his / her feet on air intake pipe 5 during maintenance of engine 100. In this regard, in this embodiment, the high-voltage power line is disposed at a position below and away from air intake pipe 5. This reduces the possibility of the high-voltage power line being damaged when a worker places his / her feet on air intake pipe 5.

[0043] In this embodiment, the engine 100 includes a low-voltage power supply wire harness 22 and a signal wire harness 23 (indicated by thick dashed lines in FIG. 6A ) in addition to the high-voltage power supply wire harness 21. The low-voltage power supply wire harness 22 and the signal wire harness 23 include low-voltage wires through which electricity of a lower voltage flows than the high-voltage wire included in the high-voltage power supply wire harness 21. The low-voltage wires are an example of the second electric wire of the present invention. That is, the engine 100 includes a second electric wire that is different from the first electric wire. Note that in this embodiment, the first electric wire is a high-voltage wire and the second electric wire is a low-voltage wire, but this is merely an example. For example, the first electric wire may be a low-voltage wire and the second electric wire may be a high-voltage wire.

[0044] At least a portion of the low-voltage power supply wire harness 22 and the signal wire harness 23 is disposed on the left side surface of the engine body 1 at a position spaced downward from the intake pipe 5. Note that the position spaced downward from the intake pipe 5 may be a position spaced directly below the intake pipe 5 or a position spaced diagonally downward from the intake pipe 5. Furthermore, the low-voltage power supply wire harness 22 and the signal wire harness 23 are disposed at a distance from the high-voltage power supply wire harness 21. In other words, the second electric wire is disposed on one side surface of the engine body 1 at a position spaced downward from the intake pipe 5 and at a distance from the first electric wire.

[0045] According to this embodiment, the low-voltage wires are arranged at a position below and away from the air intake pipe 5. This reduces the possibility of the low-voltage wires being damaged when an operator places their feet on the air intake pipe 5. Furthermore, since the high-voltage wires and the low-voltage wires are arranged at a distance from each other, it is possible to prevent the high-voltage wires and the low-voltage wires from being affected by each other's electromagnetic noise.

[0046] In this embodiment, the intake air pipe 5 is located downstream of the intercooler 8 in the flow direction of the intake air. That is, the intake air that has been heated to a high temperature in the turbocharger 7 and then cooled by the intercooler 8 flows into the intake air pipe 5. This makes it possible to keep the temperature around the intake air pipe 5 relatively low. As a result, it is possible to reduce the possibility of high-voltage and low-voltage wires arranged below the intake air pipe 5 being damaged by the heat from the intake air pipe 5.

[0047] Specifically, on the left side surface of the engine 100, a portion of each of the high-voltage power supply wire harness 21, the low-voltage power supply wire harness 22, and the signal wire harness 23 is disposed below the left air intake pipe 5L and extends in the direction in which the left air intake pipe 5L extends (front-rear direction). With regard to the portions of each of the wire harnesses 21 to 23 extending in the front-rear direction, the high-voltage power supply wire harness 21 is disposed below the low-voltage power supply wire harness 22 and the signal wire harness 23.

[0048] Furthermore, the portions of the low-voltage power supply wire harness 22 and the signal wire harness 23 that extend in the front-rear direction are disposed at the same height. As shown in Fig. 5, in the portions that are disposed at the same height, the signal wire harness 23 is located to the left of the low-voltage power supply wire harness 22. In Fig. 6A, the portions that are disposed at the same height are shown overlapping. Note that the low-voltage power supply wire harness 22 that is disposed on the left side surface of the engine body 1 is a wire harness that includes electric wires for supplying power to the left injector 16L (see Fig. 4).

[0049] In this embodiment, the wire harnesses 21-23 arranged on the left side of the engine 100 are arranged to the left of the left bank LB. That is, the wire harnesses 21-23 arranged on the left side of the engine 100 are arranged on the opposite side of the inter-bank area VA with the left bank LB in between. As described above, in the engine 100, the exhaust manifold (exhaust pipe) 6, which is likely to become hot, is arranged in the inter-bank area VA. For this reason, the inter-bank area VA of the engine 100 is likely to become hot. In this regard, in this embodiment, the wire harnesses 21-23 arranged on the left side of the engine 100 are arranged on the opposite side of the left bank LB with the inter-bank area VA in between. For this reason, the left bank LB is used as a wall that prevents heat from leaking from the inter-bank area VA, thereby preventing damage to the high-voltage wires and low-voltage wires arranged on the left side of the engine 100 due to heat.

[0050] In this embodiment, as shown in Fig. 6A, the engine 100 is equipped with an oil filter device 24 disposed below the intake pipe 5. The oil filter device 24 is disposed on the left side surface of the engine 100. Specifically, the oil filter device 24 is an oil filter device for purifying fuel. However, the oil filter device 24 may be another oil filter device, such as an oil filter device for purifying lubricating oil.

[0051] 6A, on the left side of engine 100, high-voltage power supply wire harness 21, low-voltage power supply wire harness 22, and signal wire harness 23 are each arranged between air intake pipe 5 and oil filter device 24 in the vertical direction. That is, the high-voltage wire (first electric wire) is arranged between air intake pipe 5 and oil filter device 24 in the vertical direction. In addition, the low-voltage wire (second electric wire) is arranged between air intake pipe 5 and oil filter device 24 in the vertical direction.

[0052] By arranging the high-voltage and low-voltage wires above the oil filter device 24, the possibility of accidentally hitting the oil filter against the high-voltage or low-voltage wires when replacing the oil filter of the oil filter device 24 can be reduced. In other words, damage to the high-voltage or low-voltage wires can be reduced. Furthermore, by arranging the high-voltage or low-voltage wires above the oil filter device 24, the possibility of oil splashed during oil filter replacement adhering to the high-voltage or low-voltage wires can be reduced. This reduces the possibility of a short circuit occurring due to oil adhesion.

[0053] The high-voltage power supply wire harness 21 is connected to the alternator 19 on the left side of the engine 100. The high-voltage power supply wire harness 21 also wraps around from the left side to the rear of the engine 100. The low-voltage power supply wire harness 22 and the signal wire harness 23 are connected to terminals in the junction box 18 on the left side of the engine 100. The low-voltage power supply wire harness 22 and the signal wire harness 23 do not wrap around from the left side to the rear of the engine 100.

[0054] 7 is a diagram schematically illustrating the position of the high-voltage power supply wire harness 21 on the rear surface of the engine 100. As described above, the engine 100 includes the intercooler 8. As shown in FIG. 7, the high-voltage power supply wire harness 21 is disposed on the rear surface of the engine 100 along the outer surface of the intercooler 8.

[0055] The high-voltage power supply wire harness 21 disposed on the rear surface of the engine 100 is disposed on the opposite side of the intercooler 8 from the inter-bank area VA (see FIG. 3). In other words, the high-voltage wires (first electric wires) provided in the engine 100 are disposed on the opposite side of the intercooler 8 from the inter-bank area VA.

[0056] In this embodiment, as described above, the inter-bank area VA is prone to high temperatures due to the presence of the exhaust manifold (exhaust pipe) 6. In this regard, in this embodiment, the high-voltage wires are arranged on the opposite side of the inter-bank area VA across the intercooler 8. As a result, the intercooler 8 is used as a wall that prevents heat from leaking from the inter-bank area VA, and damage to the high-voltage wires arranged on the rear surface of the engine 100 due to heat damage can be suppressed.

[0057] 7, in detail, the intercooler 8 has an intake air inlet portion 8a, a heat exchange portion 8b, and an intake air outlet portion 8c. The intake air inlet portion 8a is an inlet portion through which intake air sent from the turbocharger 7 enters the inside of the intercooler 8. In detail, intake air is sent to the intake air inlet portion 8a from the left turbocharger 7L and the right turbocharger 7R.

[0058] The heat exchanger 8b is located downstream of the intake air inlet 8a in the flow direction of the intake air. In the heat exchanger 8b, heat is exchanged between the intake air and a coolant (cooling water in this embodiment) supplied from a coolant pump 10 (see FIG. 2). That is, the intercooler 8 in this embodiment is a liquid-cooled type.

[0059] The intake air outlet section 8c is located downstream of the heat exchange section 8b in the flow direction of the intake air. The intake air outlet section 8c is an outlet section through which the intake air cooled by the heat exchange section 8b is discharged from the intercooler 8. More specifically, the intake air outlet section 8c has a left intake air outlet section that sends the intake air to the left intake air manifold 5L and a right intake air outlet section that sends the intake air to the right intake air manifold 5R.

[0060] In the present embodiment, as a preferred configuration, the high-voltage power supply wire harness 21 is arranged along the outer surface of the intake air outlet 8c at the rear of the engine 100. That is, the high-voltage wire (first electric wire) is arranged along the intake air outlet 8c. In such a configuration, the high-voltage wire is arranged in a portion through which the cooled intake air passes and which is likely to have a relatively lower temperature than other portions of the intercooler 8. This makes it possible to prevent the high-voltage wire from being damaged by heat. In the present embodiment, the intercooler 8 is liquid-cooled, which provides higher intake air cooling efficiency than an air-cooled type, thereby further reducing the possibility of the high-voltage wire being damaged by heat.

[0061] 8 is a diagram schematically illustrating the positions of the wire harnesses 21, 22 on the right side of the engine 100. As shown in FIG. 8, the high-voltage power supply wire harness 21, which wraps around from the rear surface of the engine 100 to the right side, is connected to the starter 20, which is disposed at the rear of the right side of the engine 100. In practice, the high-voltage power supply wire harness 21 is hardly disposed on the right side of the engine body 1. In other words, in practice, very little high-voltage wire is disposed on the right side of the engine body 1.

[0062] Similar to the left side surface, a low-voltage power supply wire harness 22 is arranged on the right side surface of the engine 100. The low-voltage power supply wire harness 22 is a wire harness for supplying power to the right injector 16R (see FIG. 4). At least a portion of the low-voltage power supply wire harness 22 arranged on the right side surface of the engine 100 is also arranged at a position spaced downward from the intake pipe 5.

[0063] The low-voltage power supply wire harness 22 disposed on the right side of the engine 100 is disposed to the right of the right bank RB. That is, the low-voltage power supply wire harness 22 disposed on the right side of the engine 100 is disposed on the opposite side of the inter-bank area VA across the right bank RB. As described above, the inter-bank area VA is prone to high temperatures due to the presence of the exhaust manifold (exhaust pipe) 6. In this regard, in this embodiment, the low-voltage power supply wire harness 22 is disposed on the opposite side of the right bank RB from the inter-bank area VA. As a result, the right bank RB is used as a wall that prevents heat from leaking from the inter-bank area VA, thereby preventing damage to the low-voltage wires disposed on the right side of the engine 100 due to heat.

[0064] 8, a coolant pipe 25 is arranged on the right side of the engine body 1. That is, the engine 100 includes the coolant pipe 25 arranged on the other side (right side) of the engine body 1, opposite to one side (left side) with the crankshaft in between. More specifically, the coolant pipe 25 is a coolant pipe that forms a coolant passage for supplying coolant to the intercooler 8.

[0065] In this embodiment, as described above, the high-voltage electrical wires are hardly arranged on the right side surface of the engine body 1. This reduces the possibility that the coolant will splash and adhere to the high-voltage electrical wires when the coolant pipe 25 is disassembled for maintenance or the like. In other words, it reduces the possibility that a short circuit will occur due to the splashing of the coolant during maintenance.

[0066] In the present embodiment, the high-voltage power supply wire harness 21 is configured to be disposed mainly on the left side of the left and right sides of the engine 100, but this is merely an example. For example, in cases where the left and right positions of the alternator 19 and the starter 20 are opposite to those in the present embodiment, the high-voltage power supply wire harness may be configured to be disposed mainly on the right side of the engine 100. Furthermore, for example, the signal wire harness 23 may be configured to be disposed on the right side of the engine 100 in accordance with the location of the ECU 17.

[0067] <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.

[0068] In the embodiment described above, the present invention is applied to a V-type engine. However, this is merely an example. The present invention can also be applied to other types of engines, such as an in-line engine in which the pistons reciprocate vertically, or a horizontally opposed engine in which the pistons reciprocate horizontally.

[0069] <4. Notes> An exemplary engine in this specification may be configured (first configuration) to include an engine body having at least one cylinder row in which multiple cylinders are arranged in the fore-and-aft direction, an air intake pipe arranged on one side of the engine body and extending in the fore-and-aft direction, and a first electric wire arranged below the air intake pipe and along the one side.

[0070] The engine of the first configuration may be configured (second configuration) to include a turbocharger and an intercooler that cools the intake air from the turbocharger, and the intake pipe is located downstream of the intercooler in the flow direction of the intake air.

[0071] The engine of the first or second configuration may be configured (third configuration) to include an oil filter device arranged below the air intake pipe, and the first electric wire is arranged between the air intake pipe and the oil filter device.

[0072] The engine of any one of the first to third configurations may be configured (fourth configuration) to include a coolant pipe arranged on the other side surface opposite the one side surface across the crankshaft.

[0073] An engine of any of the first to fourth configurations may be a V-type engine having two rows of cylinders aligned in the left-right direction, and may be configured (fifth configuration) with an exhaust pipe located in an inter-bank area between a first bank including one of the two rows of cylinders and a second bank including the other.

[0074] The engine of the fifth configuration may be configured (sixth configuration) such that it includes an intercooler arranged on one side of the inter-bank area, and the first electric wire is arranged on the opposite side of the intercooler with respect to the inter-bank area.

[0075] An engine of any of the first to sixth configurations may be configured (seventh configuration) to include a second electric wire different from the first electric wire, and the second electric wire may be configured to be spaced downward from the intake pipe and spaced apart from the first electric wire on the one side.

[0076] An engine of any of the first to seventh configurations above may be configured (eighth configuration) to include an intercooler arranged on one side of the engine body in the fore-and-aft direction, the intercooler having an air intake inlet portion and an air intake outlet portion, and the first electric wire being arranged along the outer surface of the air intake outlet portion.

[0077] In the engine of any one of the second, sixth and eighth configurations, the intercooler may be of a liquid-cooled type (ninth configuration). [Explanation of symbols]

[0078] 1. Engine body 5. Air intake manifold (air intake pipe) 6. Exhaust manifold (exhaust pipe) 7. Turbocharger 8. Intercooler 8a...Air intake 8b...Heat exchange section 8c Air intake outlet 15. Cylinder train 15L...Left cylinder row 15R Right cylinder row 21 High-voltage power supply wire harness 22 Low-voltage power supply wire harness 23 Signal wire harness 24 Oil filter device 25 Coolant pipe 100···Engine LB: Left bank (1st or 2nd bank) RB: Right bank (1st or 2nd bank) VA···Inter-bank area

Claims

1. an engine body having at least one cylinder row in which a plurality of cylinders are arranged in the front-rear direction; an intake pipe disposed on one side surface of the engine body and extending in the front-rear direction; a first electric wire disposed below the air supply pipe and along the one side surface; a coolant pipe disposed on another side surface opposite the one side surface across the crankshaft; An engine.

2. A supercharger, an intercooler that cools the intake air from the turbocharger; Equipped with The engine according to claim 1 , wherein the air intake pipe is located downstream of the intercooler in a flow direction of the air intake.

3. an oil filter device disposed below the air intake pipe; The engine according to claim 1 , wherein the first electric wire is disposed between the air intake pipe and the oil filter device.

4. A V-type engine having two rows of cylinders aligned in the left-right direction, 2. The engine according to claim 1, further comprising an exhaust pipe disposed in an inter-bank area between a first bank including one of the two cylinder rows and a second bank including the other of the two cylinder rows.

5. an intercooler disposed on one side of the inter-bank area, The engine according to claim 4 , wherein the first electric wire is arranged on an opposite side of the intercooler from the inter-bank area.

6. a second electric wire different from the first electric wire; The engine according to claim 1 , wherein the second electric wire is disposed on the one side away from the intake pipe downward and spaced apart from the first electric wire.

7. an intercooler disposed on one side of the engine body in the front-rear direction; The intercooler is an air intake inlet; an air intake outlet; and The engine according to claim 1 , wherein the first electric wire is arranged along an outer surface of the intake air outlet portion.

8. An engine body having at least one cylinder row in which a plurality of cylinders are arranged in the front-rear direction; an intake pipe disposed on one side surface of the engine body and extending in the front-rear direction; an electric wire disposed below the air supply pipe and along the one side surface; an intercooler disposed on one side of the engine body in the front-rear direction; Equipped with The intercooler is an air intake inlet; an air intake outlet; and The engine, wherein the electric wire is arranged along an outer surface of the intake air outlet portion.

9. An engine body having two cylinder rows in which a plurality of cylinders are arranged in a front-to-rear direction, and the two cylinder rows are arranged in a left-to-right direction; an intake pipe disposed on one side surface of the engine body and extending in the front-rear direction; an electric wire disposed below the air supply pipe and along the one side surface; an intercooler disposed on one side of an inter-bank area existing between a first bank including one of the two cylinder rows and a second bank including the other of the two cylinder rows; Equipped with The electric wire is arranged on the opposite side of the intercooler from the inter-bank area.

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