JP2015068217A - Engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a proper layout considering the particularity of a common rail, in an engine of a ship equipped with the common rail.SOLUTION: A common rail 45 provided on an engine is disposed on an intake surface (a left side surface) on which an intake manifold 14 is disposed, on a flywheel side rather than a fuel pump 43, and on an upper side than an oil filter. On a side surface opposite to the intake surface, an exhaust manifold and a fresh water cooler are disposed. The common rail 45 is inclinedly attached so as to face in a direction separating from the intake surface and upward.

Description

  The present invention relates to an engine provided with a common rail and installed on a ship.

  Conventionally, a diesel engine provided with a common rail fuel injection mechanism is known. Patent document 1 discloses this kind of engine.

  The common rail type fuel injection mechanism of Patent Document 1 includes a common rail, a high pressure pipe, and an injector. The common rail is disposed on the side surface of the cylinder block and stores the fuel supplied from the fuel tank at a high pressure. The high-pressure pipe is disposed on the cylinder head and connects the common rail and the injector. The injector is disposed for each cylinder, and injects fuel into the combustion chamber based on an instruction from an engine control unit (hereinafter, ECU).

  In addition, although the engine disclosed by patent document 1 is for working vehicles, such as an agricultural machine, the engine provided with the common rail is also employ | adopted also as the engine for ships.

JP 2011-17257 A

  By the way, the common rail type fuel injection mechanism has the following features, for example. That is, the number of harnesses is large because it is necessary to store fuel at a high pressure, to provide many electronic components for electronic control of fuel injection, and to connect a harness (a bundle of wires or wires) to each injector. It is to become.

  However, it has not been said that a conventional marine engine employs a common rail layout that fully considers the above characteristics. For example, when a high-temperature component (exhaust manifold, etc.) is disposed on the same side as the common rail, it is necessary to sufficiently cover the high-temperature component with a heat insulating material or the like as a countermeasure against fuel leakage. In addition, when a cooling system component such as a fresh water cooler is disposed near the common rail, there is a possibility that the electronic component of the common rail may be damaged by a slight leakage of the cooling water. In addition, the harness connecting the ECU and the injector becomes long, which may impair the appearance or easily interfere with other harnesses or pipes.

  The present invention has been made in view of the above circumstances, and a main object thereof is to provide an appropriate layout in consideration of the special characteristics of the common rail in a marine engine including the common rail.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to an aspect of the present invention, an engine having the following configuration is provided. That is, this engine includes an engine body, a flywheel, a fresh water cooler, an oil filter, a fuel pump, and a common rail. The engine body is disposed on a ship and includes a cylinder block and a cylinder head. The flywheel transmits power generated in the engine body. The fresh water cooler is disposed on the exhaust surface of the engine body, which is the side surface on which the exhaust manifold is disposed, and exchanges heat between cooling water and water taken from outside the ship. The oil filter is disposed on an intake surface opposite to the exhaust surface and on which an intake manifold is disposed. The fuel pump is disposed on the intake surface. The common rail is the intake surface, is located on the flywheel side of the fuel pump and above the oil filter, and fuel supplied from the fuel pump is passed through a fuel injection pipe. Supply to the cylinder head.

  Thereby, a common rail can be arrange | positioned on the opposite side of the components (exhaust manifold etc.) of the exhaust side which tends to become high temperature. Therefore, even if the fuel leaks, the fuel is not applied to the exhaust side parts, so that an excessive heat insulation structure is not required for the exhaust side parts. Moreover, even if it is a case where a cooling water leaks by arrange | positioning a common rail on the opposite side of a fresh water cooler, it can prevent that the electronic component of a common rail fails. Furthermore, since the fresh water cooler and the exhaust manifold are disposed on the same surface, the exhaust manifold that is at a high temperature can be appropriately cooled. Further, the length of the fuel injection pipe can be suppressed by arranging the common rail above the oil filter. Therefore, interference between the fuel injection pipe and other pipes or harnesses can be easily prevented.

  In the engine, it is preferable that the fuel injection pipe is attached to the end on the common rail side so as to be inclined so as to face away from the intake surface and upward.

  Thereby, compared with the structure to which a fuel injection pipe is attached so that it may extend perpendicularly | vertically from the side surface of an engine main body, the protrusion amount of the fuel injection pipe from the said side surface can be suppressed. Further, even when the common rail is disposed in the vicinity of the lower side of the intake manifold, the amount of bending of the fuel injection pipe can be suppressed, so that the load on the fuel injection pipe can be reduced.

  The engine preferably has the following configuration. That is, the common rail is disposed below the intake manifold. A plurality of the fuel injection pipes are attached to the common rail, and each of the fuel injection pipes is bundled and fixed to a central portion of the intake manifold.

  As a result, by bundling a plurality of fuel injection pipes in the central portion, a configuration that is less likely to interfere with other pipes and harnesses can be realized. Furthermore, a plurality of fuel injection pipes can be removed together by a simple operation during maintenance.

  In the engine, a fuel return pipe for returning the supplied fuel to the fuel tank is preferably attached to an end of the common rail on the fuel pump side.

  As a result, the length of the fuel return pipe can be reduced, and a configuration that is less likely to interfere with other pipes and harnesses can be realized.

The top view of the engine which concerns on one Embodiment of this invention. The side view by the side of the intake manifold of an engine. The side view of the exhaust manifold side of an engine. The side view by the side of the flywheel of an engine. The side view of the gear case side of an engine. The side view by the side of the gear case of the engine which removed the belt cover. Explanatory drawing which shows the flow of a fuel typically. The side view by the side of the intake manifold which shows the mechanism which performs supply of fuel, injection, etc. The side view by the side of the flywheel which shows the mechanism which performs supply of fuel, injection, etc. The perspective view which shows the structure of a fuel return pipe. The perspective view which shows the positional relationship of a gear case, a cylinder block, and an oil pan. The side view which looked at the inner side gear case from the cylinder block side. The top view which shows a connector attaching part and a connector. The perspective view which shows a connector attaching part and a connector. The perspective view which shows the shape of a 1st attachment plate, a 2nd attachment plate, and a 3rd attachment plate. The block diagram which shows the sensor, actuator, etc. which are connected to a main body side connector. The perspective view which shows the circumference | surroundings of a relay bracket. The perspective view which shows the shape of a relay bracket. The top view of the engine which concerns on other embodiment. The side view by the side of the exhaust manifold of the engine which concerns on other embodiment. Schematic which shows a mode that an engine is arrange | positioned at a sailing ship.

  Next, embodiments of the present invention will be described with reference to the drawings. The engine 100 is a diesel engine and is an inboard engine for ships.

  In the following description, as shown in the plan view of FIG. 1, the side where the suction port 10 or the flywheel housing 7 is located in the direction along the crank axis L is referred to as “front side”, and the belt cover 8 or the alternator 78 is The located side is referred to as the “rear side”. Further, the left side and the right side of the engine 100 toward the front side are simply referred to as “left side” and “right side”. Further, a view seen from the left side is referred to as a left side view or the like. Further, as shown in a side view of FIG. 2 and the like, the side on which the top cover 6 is located is referred to as “upper side”, and the side on which the oil pan 1 is located is referred to as “lower side”.

  First, basic components, a cover, a housing, and the like of the engine 100 will be described with reference to FIGS. 1 is a plan view of the engine 100, FIGS. 2 to 5 are side views of the engine 100, and FIG. 6 is a side view of the engine 100 with the belt cover 8 removed.

  The engine 100 includes an oil pan 1, an engine body 2, a cylinder head cover 5, a top cover 6, a flywheel housing 7, and a belt cover 8 as components of this type (FIGS. 1 and 2). .

  Oil pan 1 is located at the lower end of engine 100. The oil pan 1 is a container-like part for storing engine oil. The oil pan 1 is disposed between the flywheel housing 7 and the belt cover 8.

  The engine body 2 is disposed above the oil pan 1 and in the center of the engine 100. The engine body 2 includes a cylinder block 3 and a cylinder head 4.

  The cylinder block 3 is attached to the upper side of the oil pan 1. The size of the cylinder block 3 in the front-rear direction and the left-right direction is the same as that of the oil pan 1. The cylinder block 3 is formed with a hole and a cylinder for accommodating the crankshaft 60 and the like. Further, screw holes for attaching various parts are formed on the side surface of the cylinder block 3.

  The cylinder head 4 is attached to the upper side of the cylinder block 3. The cylinder head 4 forms a combustion chamber together with the cylinder block 3. The cylinder head 4 is provided with an injector 48 (see FIG. 8 and the like described later) for injecting fuel.

  The right side of the cylinder head 4 is covered with a cylinder head cover 5. An intake valve and an exhaust valve (not shown) are arranged inside the cylinder head cover 5.

  The top cover 6 is located at the upper end of the engine 100. The top cover 6 is disposed so as to cover the upper side of the cylinder head 4 and the left half of the cylinder head cover 5. The top cover 6 is attached to the cylinder head cover 5, the intake manifold 14, and the like. The top surface of the top cover 6 is configured to be flat so that an operator can walk during maintenance of the engine 100. A part of the outer edge of the top cover 6 is bent downward. Since the rear side of the cylinder head cover 5 and the fuel filter 41 protrude upward, the outer edge of the top cover 6 corresponding to this part (specifically, the rear half part on the right side and the oblique part on the left rear side) ) Is not folded down. With this configuration, it is possible to accurately cover and protect the upper part of the cylinder head 4 and the like.

  Further, a notch 6 a is formed in the front central portion of the top cover 6. This notch 6a is formed to expose the suspended portion 122. The hanging part 122 is attached to the left side of the cylinder head 4. The hanging portion 122 is a component used when the engine 100 is suspended, and a hole for hooking a crane hook is formed in the hanging portion 122 (see FIG. 17 described later).

  The flywheel housing 7 is located at the front end of the engine 100 and is attached to the front side of the cylinder block 3. A flywheel 61 is disposed inside the flywheel housing 7 (FIG. 4).

  In addition, an engine mounting portion 121 is attached to the front end portion of the flywheel housing 7 at the center in the vertical direction. The engine attachment portion 121 is attached to the left and right sides of the flywheel housing 7. The engine mounting portion 121 has a hole for mounting the engine 100 to the installation location with a bolt. The engine mounting portion 121 is also mounted on the left and right sides of the front side of the cylinder block 3 (FIGS. 5 and 6).

  The belt cover 8 is positioned at the rear end of the engine 100 and is attached to the rear side of the cylinder block 3 via a gear case 64. The belt cover 8 has a container shape in which an outer edge is bent, and is disposed so as to cover the belt 63. The belt cover 8 is substantially polygonal and has a shape in which the lower right portion is recessed inward. The seawater pump 20 of the present embodiment is disposed on the front side of the gear case 64 (FIG. 3), but when the seawater pump 20 is disposed on the rear side of the gear case 64, the seawater pump 20 is positioned in a recessed portion of the belt cover 8. be able to. Thereby, the seawater pump 20 can be accommodated and arranged well.

  Next, the components of the intake system and the exhaust system will be described with reference to FIGS.

  The engine 100 includes an intake port 10, a supercharger 11, intake pipes 12 and 13, an intake manifold 14, a breather hose 15, an exhaust manifold 16, and a mixing elbow 17 as intake and exhaust system components. .

  The suction port 10 is an end portion on the front side of the engine 100 and is located above the center (FIGS. 1 and 2). The suction port 10 sucks external air. An air cleaner is disposed inside the suction port 10 to remove dust and the like contained in the external air.

  The supercharger 11 is disposed at the front end of the engine 100 and on the right side of the suction port 10. The supercharger 11 includes a turbine housing 11a having a turbine wheel (not shown) and a compressor housing 11b having a compressor wheel (not shown). The turbine wheel is configured to rotate using exhaust gas. The compressor wheel is connected to the same shaft as the turbine and rotates as the turbine wheel rotates. The turbocharger 11 can compress air and forcibly intake air by rotating the compressor wheel.

  The intake pipe 12 is connected to the intake port 10 and the supercharger 11. Air sucked by the suction port 10 and the supercharger 11 flows through the intake pipe 12. The intake pipe 12 bends around the suction port 10 counterclockwise in the front side view (FIG. 4), passes through the upper side of the suction port 10 and the supercharger 11, and then is disposed on the right side of the engine body 2. It is connected to the upper side of the cooler 22 (details will be described later) (FIG. 3). The air flowing through the intake pipe 12 is cooled by the intercooler 22.

  The intake pipe 13 passes through the intake port 10 and the upper side of the supercharger 11 so as to extend along the intake pipe 12 from the upper side of the intercooler 22 and through the inner side of the intake pipe 12. 2 is connected to the front side of the intake manifold 14 arranged on the left side (FIG. 2).

  The intake manifold 14 is disposed on the left side (the intake surface side) of the engine body 2, and specifically, is attached to the left side of the cylinder head 4. The intake manifold 14 divides the air supplied from the intake pipe 13 into a number corresponding to the number of cylinders (four in this embodiment) and supplies it to the cylinder head 4.

  In the combustion chambers of the cylinder block 3 and the cylinder head 4, after the air supplied from the intake manifold 14 is compressed, power is generated by injecting fuel and driving the piston. Blow-by gas and exhaust gas are generated in the combustion chamber.

  One end of the breather hose 15 is connected to the cylinder head cover 5 (not shown). The breather hose 15 is connected to the suction port 10 from the cylinder head cover 5, between the cylinder head 4 and the top cover 6, and below the intake pipes 12 and 13 (FIG. 1). The breather hose 15 supplies blow-by gas generated in the combustion chamber to the suction port 10.

  The exhaust manifold 16 is on the right side (exhaust surface side) of the engine body 2 and is substantially the same height as the intercooler 22 and is disposed on the inner side of the intercooler 22 (FIG. 3). The exhaust manifold 16 is attached to the right surface of the cylinder block 3. The exhaust manifold 16 collectively supplies exhaust gases generated in the plurality of combustion chambers to the turbine housing 11 a of the supercharger 11.

  Further, the exhaust manifold 16 of the present embodiment has an integral structure with the fresh water cooler 24 disposed on the upper side. The exhaust manifold 16 is cooled by the cooling water (fresh water) of the fresh water cooler 24. By adopting such an integrated structure, a cooling pipe for supplying cooling water to the exhaust manifold 16 becomes unnecessary. In addition, by disposing the intercooler 22 outside the exhaust manifold 16, it is possible to prevent the exhaust manifold 16 that is likely to become hot from being exposed.

  The exhaust gas supplied from the exhaust manifold 16 to the turbine housing 11a is used to rotate the turbine wheel, and is then discharged from the mixing elbow 17 connected to the right side of the supercharger 11.

  Next, cooling system components and engine oil-related components will be described with reference to FIGS.

  The engine 100 includes a seawater pump 20, seawater pipes 21, 23, 25, an intercooler 22, a fresh water cooler 24, cooling water pipes 26, 29, 30, 34, and a cooling water pump 27 as cooling system components. The pump pulley 28 and the oil cooler 33 are provided. The engine 100 includes an oil filter 31 and an oil level gauge 32 as parts related to engine oil.

  The seawater pump 20 is disposed on the right side of the engine body 2 and below the intercooler 22 and in the vicinity of the engine mounting portion 121 (FIG. 3). The seawater pump 20 is attached to the front side of the gear case 64. Seawater is taken into the engine 100 via a seawater pipe (not shown) connected to the seawater pump 20.

  Seawater taken in by the seawater pump 20 is supplied to the intercooler 22 via a seawater pipe 21 extending obliquely upward in the front direction.

  The intercooler 22 is disposed on the right side of the engine body 2, below the fresh water cooler 24, and outside the exhaust manifold 16. The intercooler 22 is attached to the lower side of the connection portion between the intake pipe 12 and the intake pipe 13. As described above, the intercooler 22 cools the air sucked by the suction port 10 and the supercharger 11 by heat exchange with seawater.

  Seawater that has passed through the intercooler 22 flows through a seawater pipe 23 connected to the right side of the intercooler 22. The seawater pipe 23 passes through the lower side and the left side of the exhaust manifold 16 and is connected to the front side of the fresh water cooler 24.

  The fresh water cooler 24 is disposed on the right side of the cylinder head cover 5 and constitutes the upper surface of the engine 100 together with the top cover 6. The fresh water cooler 24 is attached to the upper side of the exhaust manifold 16. Seawater is supplied to the fresh water cooler 24 from the seawater pipe 23 and cooling water is supplied from a cooling water pipe 34 described later. The fresh water cooler 24 cools this cooling water by heat exchange with seawater.

  Seawater used for heat exchange with the cooling water by the fresh water cooler 24 flows through a sea water pipe 25 connected to the rear side of the fresh water cooler 24. The seawater pipe 25 passes through the outside of the fresh water cooler 24 and the intake pipes 12 and 13 and is connected to the mixing elbow 17. The mixing elbow 17 mixes and discharges the above-mentioned exhaust gas and seawater.

  The cooling water cooled by the fresh water cooler 24 flows through the cooling water pipe 26 connected to the rear side of the fresh water cooler 24 (FIG. 6). The cooling water pipe 26 is connected to the cooling water pump 27 after passing through the lower side of the cooling water pump 27.

  The cooling water pump 27 is disposed on the rear side of the engine body 2 and attached to the rear side of the cylinder head. The cooling water pump 27 is connected to the crankshaft 60 and the belt 63 via the pump pulley 28. With this configuration, the cooling water pump 27 can supply cooling water to each part of the engine 100.

  The cooling water sent out by the cooling water pump 27 first flows in the cylinder block 3 to cool the cylinder block 3. The cooling water passage in the cylinder block 3 has a branch point. A cooling water pipe 29 (FIG. 2) is connected to one of the branched passages. The cooling water pipe 29 is disposed on the left side of the engine main body 2, extends to the rear side along the engine main body 2, and is connected to the oil cooler 33 (FIG. 2). Thereby, engine oil can be cooled using cooling water. Thereafter, the cooling water returns to the cooling water pump 27 through the cooling water pipe 30 extending further rearward from the oil cooler 33. The other passage branched from the cylinder block 3 is connected to a cooling water pump 27 via a passage in the cylinder head 4. Thereafter, the cooling water is sent to the fresh water cooler 24 by a cooling water pipe 34 connecting the upper side of the cooling water pump 27 and the rear side of the fresh water cooler 24.

  The oil filter 31 is disposed on the left side of the engine body 2, below the intake manifold 14, and on the front side of the engine mounting portion 121. The oil filter 31 is attached to the left side of the cylinder block 3 via an oil cooler 33. The oil filter 31 removes metal powder, dust and the like contained in the engine oil with a filter.

  The oil level gauge 32 is connected to the oil pan 1 and is configured to extend upward from the oil pan 1. The oil level gauge 32 is a component for measuring the amount of engine oil.

  Next, components for supplying and injecting fuel will be described with reference to FIGS.

  FIG. 7 is an explanatory diagram schematically showing the flow of fuel. 8 and 9 are a left side view and a front side view of a component that performs fuel supply, injection, and the like. FIG. 10 is a perspective view showing the configuration of the fuel return pipe 49.

  The engine 100 includes a fuel tank 40, a fuel filter 41, a low pressure pipe 42, a fuel pump 43, a high pressure pipe 44, a common rail 45, a fuel injection pipe 46, and a convergence as fuel supply and injection parts. A tool 47, an injector 48, a fuel return pipe 49, a common rail fuel return pipe 50, and an injector fuel return pipe 51 are provided.

  The fuel stored in the fuel tank 40 is sucked into the fuel pump 43 via the fuel filter 41 and the low pressure pipe 42.

  The fuel filter 41 is disposed on the left side of the engine body 2, on the rear side of the intake manifold 14 and on the upper side of the fuel pump 43. The fuel filter 41 is attached to the upper side of the intake manifold 14. The fuel filter 41 removes dust and dirt from the fuel by the filter.

  The fuel pump 43 is disposed on the left side of the engine body 2 and below the intake manifold 14 and on the front side of the gear case 64 (FIG. 2). The fuel pump 43 is attached to the front side of the inner gear case 66.

  The fuel pump 43 includes a feed pump 43a, a metering valve 43b, and a plunger 43c. The feed pump 43a sucks the fuel in the fuel tank 40. The metering valve 43b adjusts the amount of fuel sucked by the feed pump 43a. The plunger 43 c pressurizes the fuel that has passed through the metering valve 43 b and supplies it to the common rail 45 via the high-pressure pipe 44.

  A mounting base 110 for mounting a common rail 45 and a connector mounting portion 70 described later is mounted on the cylinder block 3. The mounting base 110 includes a fixed portion 110a, a common rail mounting portion 110b, and a connector mounting plate mounting portion 110c.

  A hole into which a bolt for attaching the mounting base 110 to the cylinder block 3 can be inserted is formed in the fixed portion 110a. The common rail mounting portion 110b is two inclined surfaces that are inclined so as to face obliquely upward on the left. Each inclined surface is formed with a hole into which a bolt for attaching the common rail 45 can be inserted. The connector mounting plate mounting portion 110c will be described later.

  The common rail 45 is disposed on the left side of the engine body 2 and below the intake manifold 14 and above the oil filter 31. A mounting portion 45 a is formed on the common rail 45. The attachment portion 45a is two portions protruding downward, and a hole for inserting a bolt is formed. The common rail 45 is attached to the mounting base 110 by attaching the bolt in a state where the holes of the attaching portion 45a and the holes of the common rail attaching portion 110b are aligned.

  The common rail 45 includes a harness connection connector 45c, a plurality of fuel injection pipe connectors 45d, a high pressure pipe connector 45b, and a fuel return pipe connector 45e in order from the front side. It should be noted that the connectors other than the harness connection connector 45c are arranged so as to face obliquely upward on the left, like the common rail mounting portion 110b. With this configuration, the amount of protrusion of the fuel injection pipe 46 from the side surface can be suppressed as compared with the configuration in which the fuel injection pipe 46 is attached so as to extend vertically from the side surface of the engine body 2 (FIG. 9). Further, since the fuel injection pipe 46 can be bent gently, the load can be reduced.

  The aforementioned high pressure pipe 44 is connected to the high pressure pipe connector 45b. A harness (not shown) is connected to the harness connection connector 45c, and the internal pressure of the common rail 45 is sent to the ECU 82 (engine control unit, control unit, see FIG. 13 described later) via this harness. The fuel injection pipe connectors 45d are arranged in the same number as the cylinders, and supply fuel to the injector 48 through the fuel injection pipe 46. The fuel return pipe connector 45e is used when returning the fuel in the common rail 45 to the fuel tank 40.

  The plurality of fuel injection pipes 46 are attached to the central portion of the intake manifold 14 by a converging tool 47 so as to extend upward and to approach each other. In the converging tool 47 of this embodiment, two fuel injection pipes 46 are bundled and attached to the intake manifold 14. The plurality of fuel injection pipes 46 are respectively connected to the injectors 48 so as to be separated from each other above the converging tool 47.

  By bundling the fuel injection pipes 46 in this way, it is difficult to interfere with other pipes and harnesses, and moreover, a plurality of fuel injection pipes 46 can be removed together by a simple operation during maintenance.

  The injector 48 is attached to the upper side of the cylinder head 4. The injector 48 includes an injector connector 48a and a fuel injection valve 48b. The injector connector 48 a is connected to the ECU 82 via an injector harness 76 that passes between the intake manifold 14 and the cylinder head 4. The fuel injection valve 48b injects fuel based on an instruction from the ECU 82. With this configuration, it is possible to achieve clean exhaust gas, suppress noise, and the like by injecting fuel at an appropriate timing or performing multi-injection that injects several times in one injection step.

  Next, a configuration for returning the fuel supplied to the common rail 45 and the injector 48 to the fuel tank 40 will be described. The engine 100 includes a fuel return pipe 49 that returns the supplied fuel to the fuel tank 40 (FIG. 10).

  One end of the fuel return pipe 49 is connected to the fuel pump 43, and the other end of the fuel return pipe 49 is connected to the fuel tank 40. The fuel return pipe 49 is attached with a mounting bracket 49a in which a hole for inserting a bolt is formed. The fuel return pipe 49 is attached to the rear side of the intake manifold 14 with a bolt by a mounting bracket 49a.

  In addition, a tubular common rail side attachment port 49b and a tubular injector side attachment port 49c are connected to the fuel return pipe 49 by welding. A common rail fuel return pipe 50 is attached to the common rail side attachment port 49b. An injector fuel return pipe 51 is attached to the injector-side attachment port 49c.

  Thus, the pipes are welded together to form the common rail side attachment port 49b and the injector side attachment port 49c, so that components for joining the tubes can be omitted. Therefore, the structure for returning the fuel can be made compact.

  As described above, in this embodiment, the fuel supply parts such as the common rail 45 are arranged on the side opposite to the exhaust manifold 16, so that even if the fuel leaks, the fuel is not supplied to the exhaust manifold 16. Since it does not hang, an excessive heat insulation structure becomes unnecessary.

  Moreover, the length of the high pressure pipe 44 can be suppressed by arranging the high pressure pipe connector 45b closer to the fuel pump 43 than the fuel injection pipe connector 45d. Furthermore, the length of the common rail fuel return pipe 50 can be reduced by disposing the fuel return pipe connector 45e closer to the fuel pump 43 than the fuel injection pipe connector 45d. Moreover, interference between the harness and the high-pressure pipe 44 or the like can be prevented by arranging the harness connection connector 45c at the end portion on the opposite side (front side).

  Next, components related to power transmission will be described with reference to FIGS. 1 to 6, 11, and 12.

  FIG. 11 is a perspective view showing the positional relationship between the gear case 64, the cylinder block 3, and the oil pan 1. FIG. 12 is a side view of the inner gear case 66 viewed from the cylinder block 3 side.

  Engine 100 includes a crankshaft 60, a flywheel 61, a crank pulley 62, a belt 63, and a gear case 64 as parts related to power transmission.

  The crankshaft 60 is inserted through a hole formed in the cylinder block 3 (FIG. 4). Crankshaft 60 transmits power generated by engine 100.

  The flywheel 61 is disposed inside the flywheel housing 7 located on the front side of the engine body 2, and transmits the power transmitted by the crankshaft 60 to an external screw or the like via a clutch (not shown).

  The crank pulley 62 is disposed on the rear side of the engine body 2 (FIG. 6). The crank pulley 62 transmits the power transmitted from the crankshaft 60 to the pump pulley 28 and the alternator 78 via the belt 63.

  The gear case 64 is disposed on the upper side of the oil pan 1 and on the rear side of the cylinder block 3. The gear case 64 includes an outer gear case 65 positioned on the outer side (rear side) and an inner gear case 66 positioned on the inner side (front side) (FIG. 11).

  The outer gear case 65 is attached to the inner gear case 66 with bolts. The outer gear case 65 is formed with a crankshaft insertion hole 65a and a seawater pump mounting hole 65b.

  The crankshaft insertion hole 65 a is a hole through which the crankshaft 60 is inserted and connected to the crank pulley 62. The seawater pump mounting hole 65b is a hole for mounting the seawater pump 20 when the seawater pump 20 is disposed on the rear side of the gear case 64 as described above.

  The inner gear case 66 is disposed between the outer gear case 65 and the cylinder block 3. The inner gear case 66 is attached to the outer gear case 65 by bolts and is attached to the cylinder block 3 by an adhesive. The inner gear case 66 is formed with a crankshaft insertion hole 66a, a gear arrangement hole 66b, an oil supply hole 66c, and an O-ring 66d (FIG. 12).

  The crankshaft insertion hole 66a is a hole through which the crankshaft 60 is inserted and connected to the crank pulley 62, like the crankshaft insertion hole 65a. The gear arrangement hole 66b is a hole for arranging various pump gears or cam gears. The oil supply hole 66 c is a hole for supplying engine oil for lubricating the gear from the cylinder block 3. The O-ring 66d is attached to the oil supply hole 66c and prevents engine oil from leaking.

  In addition, since the engine arrange | positioned at a ship has a large vibration, even if O-ring 66d is arrange | positioned, engine oil may leak. However, since the oil pan 1 is located below the inner gear case 66, even when engine oil leaks, the engine oil does not leak to the outside, and the engine oil is put inside the engine 100. Can be returned.

  Next, a configuration for connecting the ECU 82 to the electrical component and its mounting components, particularly the engine main body 2, will be described with reference to FIGS.

  13 and 14 are a plan view and a perspective view showing the connector mounting portion 70 and the main body side connector 75, respectively. FIG. 15 is a perspective view in which a harness, a bolt, and the like are removed from FIG.

  The engine 100 includes a connector mounting portion 70, a harness support portion 74, a main body side connector 75, an injector harness 76, a sensor harness 77, and an alternator 78 as electrical components and mounting components. The engine 100 includes a control unit side connector 79, a control unit side harness 80, and a control unit side connector harness guide unit 81 as components for connecting to the ECU 82.

  The connector mounting portion 70 is disposed on the left side of the engine body 2. The connector mounting portion 70 is a component for mounting the main body side connector 75 and includes a first mounting plate 71, a second mounting plate 72, and a third mounting plate 73.

  The first mounting plate 71 is an L-shaped part formed by bending a flat plate, and includes a vertical portion 71a that is a surface parallel to the vertical direction (up and down direction) and a horizontal surface that is parallel to the horizontal direction. Part 71b. A hole for inserting a bolt is formed near the end of the horizontal portion 71b on the cylinder block 3 side, and this hole is formed in the connector mounting plate mounting portion 110c which is the lower surface of the mounting base 110 described above. The first mounting plate 71 is attached to the mounting base 110 by attaching the bolt in a state where the holes are aligned.

  Thus, by attaching both the common rail 45 and the connector mounting portion 70 to one mounting base 110, the number of parts can be reduced. Also, a simple layout can be realized by attaching the common rail 45 extending upward to the upper side and attaching the connector attaching portion 70 extending downward to the lower side.

  The horizontal portion 71b is further formed with a plurality of holes and an oil level gauge mounting portion 71c. The oil level gauge mounting portion 71c is formed to extend upward from the horizontal portion 71b. The oil level gauge 32 is attached to the oil level gauge attachment portion 71c via other attachment parts.

  The second mounting plate 72 is a substantially triangular flat plate. The second mounting plate 72 is formed with a first mounting plate mounting hole 72a, a harness support part mounting hole 72b, and a third mounting plate mounting hole 72c. In addition, although a code | symbol is abbreviate | omitted, the hole is formed also in the 1st attachment plate 71 in the position corresponding to the 1st attachment plate attachment hole 72a and the harness support part attachment hole 72b.

  The second attachment plate 72 is attached to the first attachment plate 71 by attaching bolts and vibration isolating rubber 72d to the first attachment plate attachment hole 72a. The harness support portion 74 is attached to the second attachment plate 72 by attaching a bolt to the harness support portion attachment hole 72b. The third attachment plate 73 is attached to the second attachment plate 72 by attaching a bolt to the third attachment plate attachment hole 72c.

  The third mounting plate 73 is composed of two horizontal portions 73a and a vertical portion 73c. The horizontal part 73a has a surface parallel to the horizontal direction, and is formed with a U-shaped notch 73b. The third attachment plate 73 is attached to the second attachment plate 72 by this notch 73b. The third mounting plate 73 can be removed from the second mounting plate 72 without completely removing the bolt (that is, only by loosening the bolt) by using the notch 73b instead of the hole. Thereby, it is possible to quickly attach and detach the control unit side connector 79 and to prevent the bolt from being lost.

  The vertical portion 73c has a surface parallel to the vertical direction (up and down direction) (in other words, the vertical portion 73c, the horizontal portion 71b, and the second mounting plate 72 are vertical). Since the second mounting plate 72 is substantially triangular as described above, the vertical portion 73c is not parallel to the crankshaft 60, but is inclined (more specifically, as it moves forward, it moves away from the cylinder block 3). As attached). A total of four main body side connectors 75 are attached to the rear end of the vertical portion 73c, two on each side.

  Main body side connector 75 is electrically connected to each part of engine 100. As a specific example, the main body side connector 75 arranged on the lower side and the outside is connected to an injector 48 (detailed below, an injection actuator 148) via an injector harness 76. The injector harness 76 is supported by the harness support portion 74 described above. The main body side connector 75 disposed on the upper side and outside is connected to a sensor that detects the operating state of the engine 100 via a sensor harness 77 (details will be described later).

  Further, the two main body side connectors 75 arranged on the outer side are larger than the main body side connector 75 arranged on the inner side and on the lower side. By disposing the large main body side connector 75 on the outside as described above, the outside having a sufficient space can be effectively used. The other main body side connector 75 is connected to a temperature sensor or a pressure sensor of each part (details will be described later).

  Further, the main body side connector 75 is formed with an engaging portion 75 a that can be engaged with the control portion side connector 79 connected to the ECU 82. In the present embodiment, since the main body side connector 75 is a female connector, the engaging portion 75a has an opening shape. Further, since the vertical portion 73c is inclined with respect to the crankshaft 60 as described above, the main body side connector 75 is disposed so as to be inclined so that the engaging portion 75a faces the left side and the front side. .

  By disposing the main body side connector 75 in this way, the amount of protrusion of the main body side connector 75 can be suppressed compared to a configuration in which the main body side connector 75 is disposed perpendicular to the side surface of the engine main body 2. The size of 100 can be reduced. Further, the attachment / detachment work can be easily performed as compared with the configuration in which the main body side connector 75 is horizontally disposed on the side surface of the engine main body 2. In the present embodiment, the amount of protrusion from the engine main body 2 can be further suppressed by arranging the main body side connector 75 elongated vertically in the vertical direction and also arranging the main body side connector 75 inside. .

  The control unit side connector 79 is configured to be engageable with the main body side connector 75. The control unit side connector 79 is connected to the ECU 82 via the control unit side harness 80. The control unit side harness 80 is gradually bent in a direction parallel to the crankshaft 60 after proceeding in parallel to the direction of the engaging portion 75a. The control unit side harness 80 is guided by a control unit side connector harness guide unit 81 attached to the flywheel housing 7 before and after being parallel to the crankshaft 60, and further extends forward.

  Here, in the configuration in which the main body side connector 75 is arranged perpendicularly or parallel to the side surface of the engine main body 2, the control unit side harness 80 needs to be bent greatly (rapidly) in any configuration. In this respect, by disposing the main body side connector 75 in an inclined manner as in this embodiment, the control unit side harness 80 is forcibly set even if the flywheel housing 7 has a large diameter. The outside of the flywheel housing 7 can be passed without bending.

  Next, an electrical configuration of the engine 100, in particular, a sensor and an actuator connected to the main body side connector 75 will be described with reference to a block diagram of FIG.

  As described above, the various sensors and actuators that detect the operating state of the engine 100 are connected to the ECU 82 via the main body side connector 75 and the control unit side connector 79. The ECU 82 issues a warning and adjusts the actuator based on information received from various sensors. The ECU 82 is connected to an instrument panel 83 that displays the engine speed and the like, a battery 84, and the like. Hereinafter, various sensors and actuators will be specifically described.

  As shown in FIG. 16, a starter relay 92 and a hydraulic switch 141 are connected to one of the four main body side connectors 75. Starter relay 92 drives starter motor 95 to start engine 100. The hydraulic switch 141 detects the pressure of hydraulic oil supplied to the hydraulic device.

  In addition, a coolant temperature sensor 142, a cam shaft rotation sensor 143, an intake pressure sensor 144, and an alternator 78 are connected to one of the four main body side connectors 75. The cooling water temperature sensor 142 detects the temperature of the cooling water. The cam shaft rotation sensor 143 detects the number of rotations of the cam shaft. The intake pressure sensor 144 detects the pressure of intake air.

  A crankshaft rotation sensor 145, a rail pressure sensor 146, and a fuel temperature sensor 147 are connected to one of the four main body side connectors 75. The crankshaft rotation sensor 145 detects the number of rotations of the crankshaft. The rail pressure sensor 146 detects the pressure of the common rail 45. The fuel temperature sensor 147 detects the temperature of the fuel.

  Also, four injection actuators 148 and a metering actuator 149 are connected to one of the four main body side connectors 75. The injection actuator 148 injects fuel from the injector 48 in accordance with an instruction from the ECU 82. By controlling the injection actuator 148, the fuel injection amount and the injection timing can be adjusted. The metering actuator 149 can adjust the amount of fuel supplied to the common rail 45 in accordance with an instruction from the ECU 82.

  In this embodiment, the main body side connector 75 to which the alternator 78 is connected and the main body side connector 75 to which the injection actuator 148 is connected are fixed to the outside of the third mounting plate 73. The connector 75 may be fixed to the outside. Moreover, the combination of the sensor and the actuator connected to each main body side connector 75 is arbitrary, and can be changed as appropriate.

  Next, the relay bracket 90 and the like to which the starter relay 92 is attached will be described with reference to FIGS. 2, 3, 17 and 18.

  FIG. 17 is a perspective view showing the periphery of the relay bracket 90. FIG. 18 is a perspective view showing a state in which parts such as the top cover 6 are not displayed from FIG.

  Engine 100 includes a relay bracket 90, a starter relay 92, a relay harness 93, a starter motor harness 94, and a starter motor 95.

  The relay bracket 90 is arranged on the front side of the top cover 6 from the right side of the top cover 6 to the center. The upper end of the relay bracket 90 is positioned at least above the lower end of the top cover 6 (FIG. 2). The relay bracket 90 is disposed at a position covering the lower side of the intake pipe 13. The relay bracket 90 includes a vertical portion 90a, an inclined portion 90b, and a relay mounting portion 90c.

  The vertical part 90a has a surface parallel to the vertical direction (up and down direction). The vertical portion 90 a is attached to the front side of the cylinder head 4 with bolts and vibration-proof rubber 91. Notches 90d are formed on the left and right sides of the vertical portion 90a. The aforementioned breather hose 15 passes in the vicinity of the left notch 90d. In the vicinity of the right notch 90d, the sea water pipe 23 passes. A relay mounting portion 90c is formed on the left side of the vertical portion 90a and below the notch 90d. The relay mounting portion 90c is bent so as to incline forward from the vertical portion 90a from the viewpoint of space saving or the layout of the harness. A starter relay 92 is attached to the relay attachment portion 90c.

  The starter relay 92 is attached to the front side of the relay attachment portion 90c with a bolt. A relay harness 93 and a starter motor harness 94 are connected to the starter relay 92. The relay harness 93 extends downward from the starter relay 92 and is connected to the ECU 82 via the main body side connector 75 and the like. The starter motor harness 94 extends to the right side from the starter relay 92, passes through the front side of the relay bracket 90, extends to the rear side along the right side surface of the engine body 2, and is connected to the starter motor 95 (FIG. 3). Starter relay 92 is used to start engine 100 by driving starter motor 95.

  The inclined portion 90b is located on the upper side of the vertical portion 90a and is inclined forward from the vertical direction. The inclined portion 90b is disposed in the vicinity of the intake pipe 13 and on the rear side. The inclined portion 90b is formed with a notch 90e at a position corresponding to the large diameter portion of the intake pipe 13 (connecting portion between the pipes).

  Here, when the fuel leaks from the fuel injection pipe 46 or the fuel return pipe 49 and scatters, it is necessary to prevent the fuel from being sucked from the suction port 10 and applied to the supercharger 11 that becomes high temperature. is there. In the present embodiment, a component for receiving the fuel is not provided separately, and the fuel is received by the top cover 6, the intake pipe 13, and the relay bracket 90.

  Since the top cover 6 covers the upper side of the fuel injection pipe 46, it is possible to receive the fuel scattered on the upper side. Further, since the outer edge of the top cover 6 is bent downward as described above, it is possible to catch the fuel scattered to the front side.

  Since the air cooled by the intercooler 22 passes through the intake pipe 13, the temperature is lower than that of the intake pipe 12. Therefore, by disposing the intake pipe 13 on the fuel injection pipe 46 side (rear side) with respect to the intake pipe 12, the fuel can be received by the intake pipe. In particular, since the intake pipe 13 is disposed so as to cross between the intake port 10 and the supercharger 11 and the fuel injection pipe 46, the scattered fuel can be received. In particular, in the present embodiment, there is a possibility that the fuel may pass through the notch 6 a formed in the top cover 6, and thus such fuel can be received by the intake pipe 13.

  The relay bracket 90 is disposed so as to partition the space above the cylinder head 4 and the suction port 10. Specifically, the relay bracket 90 is disposed so as to cover the lower side of the intake pipe 13 (in other words, to block a route that passes through the intake pipe 13 and reaches the intake port 10). Then you can catch the fuel that can not be received. Further, since the relay bracket 90 is disposed so as to cover the lower side of the top cover 6 and the notch 6a, it is possible to receive fuel that cannot be received by the top cover 6.

  In particular, in this embodiment, the relay bracket 90 can be brought close to the intake pipe 13 by forming the inclined portion 90b and the notch 90e, so that the scattered fuel can be reliably received.

  In this way, the scattered fuel can be reliably received by closing the path through which the fuel reaches the suction port 10 or the supercharger 11 from the upper part of the cylinder head 4 by the plurality of parts described above. Moreover, in this embodiment, since the component which receives fuel is not provided separately, the number of components can be reduced and a structure can be simplified.

  As described above, the engine 100 includes the engine body 2, the flywheel 61, the fresh water cooler 24, the oil filter 31, the fuel pump 43, and the common rail 45. The engine body 2 is arranged on a ship and includes a cylinder block 3 and a cylinder head 4. The flywheel 61 transmits power generated in the engine body 2. The fresh water cooler 24 is disposed on the exhaust surface (right side surface), which is the side surface of the engine body 2 where the exhaust manifold 16 is disposed, and performs heat exchange between the cooling water and seawater. The oil filter 31 is disposed on the intake surface (left side surface) that is the side surface opposite to the exhaust surface and on which the intake manifold 14 is disposed. The fuel pump 43 is disposed on the intake surface. The common rail 45 is an intake surface, is located on the flywheel 61 side of the fuel pump 43 and above the oil filter 31, and the fuel supplied from the fuel pump 43 is supplied via the fuel injection pipe 46. Supply to cylinder head 4.

  As a result, the common rail 45 can be disposed on the opposite side of the exhaust-side components (exhaust manifold 16 and the like) that are likely to be hot. Therefore, even if the fuel leaks, the fuel is not applied to the exhaust side parts, so that an excessive heat insulation structure is not required for the exhaust side parts. Moreover, even if it is a case where a cooling water leaks by arrange | positioning the common rail 45 on the opposite side of the intercooler 22 and the fresh water cooler 24, it can prevent that the electronic component of the common rail 45 fails. Furthermore, since the fresh water cooler 24 and the exhaust manifold are disposed on the same surface, the exhaust manifold 16 that is at a high temperature can be appropriately cooled. Further, the length of the fuel injection pipe 46 can be suppressed by arranging the common rail 45 above the oil filter 31. Therefore, it is possible to easily prevent the fuel injection pipe 46 from interfering with other pipes and harnesses.

  Further, in the engine 100 of the present embodiment, the fuel injection pipe 46 is attached to the end on the common rail 45 side so as to incline so as to face away from the intake surface and upward.

  Thereby, compared with the structure to which the fuel injection pipe 46 is attached so that it may extend perpendicularly | vertically from the side surface of the engine main body 2, the protrusion amount of the fuel injection pipe 46 from the said side surface can be suppressed. Further, since the amount of bending of the fuel injection pipe 46 can be suppressed, the load on the fuel injection pipe 46 can be reduced.

  In the engine 100 of the present embodiment, the common rail 45 is disposed below the intake manifold 14. A plurality of fuel injection pipes 46 are attached to the common rail 45, and each fuel injection pipe 46 is bundled and fixed to the central portion of the intake manifold 14.

  As a result, by bundling the plurality of fuel injection pipes 46 at the center, it is possible to realize a configuration that is less likely to interfere with other pipes, harnesses, and the like. Furthermore, the plurality of fuel injection pipes 46 can be removed together by a simple operation during maintenance.

  In the engine 100 of the present embodiment, a common rail fuel return pipe 50 that returns the supplied fuel to the fuel tank 40 is attached to the end of the common rail 45 on the fuel pump 43 side.

  As a result, the length of the common rail fuel return pipe 50 can be reduced, and a configuration that is less likely to interfere with other pipes and harnesses can be realized.

  Next, another embodiment of the above embodiment will be described with reference to FIGS.

  The engine 101 according to another embodiment has basically the same configuration as the engine 100 except that it is a naturally aspirated engine. Therefore, a different part from the engine 100 is demonstrated.

  First, the components of the intake system and the exhaust system will be described. The engine 101 includes a suction port 10x (FIG. 19). A suction pipe 10a is connected to the suction port 10x. The suction pipe 10a extends to the right side from the suction port 10x, and then bends forward and obliquely downward. The suction port 10x sucks air from the suction pipe 10a. The air sucked by the suction port 10x is sent to the intake manifold 14 through the intake pipe 12 extending rearward from the suction port 10x. Since the engine 101 is a naturally aspirated type, it is not necessary to cool the sucked gas, and therefore air is supplied directly to the intake manifold 14 from the suction port 10x. Therefore, the engine 101 does not include the intake pipe 13. Further, since the engine 101 does not include the supercharger 11, the exhaust gas discharged from the exhaust manifold 16 is directly discharged from the mixing elbow 17.

  Next, components of the cooling system will be described. Unlike the engine 100, the engine 101 has a seawater pump 20 disposed behind the gear case 64 (FIG. 20). Seawater taken in by the seawater pump 20 flows through the seawater pipe 21. The seawater pipe 21 extends to the upper side after passing through the lower side of the engine mounting portion 121, extends to the front side in the vicinity of the exhaust manifold 16, travels around the front end portion of the exhaust manifold 16, and is connected to the front side of the fresh water cooler 24. The Further, in the engine 101, unlike the engine 100, a seawater pipe 25 for draining seawater is attached to the front side of the fresh water cooler 24.

  The present invention can also be applied to the naturally aspirated engine 101 as described above.

  In addition, the engine 100 (or engine 101) of the above-described embodiment is disposed, for example, on a sailing ship 130 as shown in FIG. In brief, the sailing ship 130 includes a hull 131, a mast 132, a ship bottom 133, a center board 134, a power transmission device 135, and a propeller 136. An engine 100 is arranged inside the hull 131.

  The power transmission device 135 is disposed on the rear end side of the engine 100, and extends so as to extend downward from the engine 100 so as to go out into the water from the ship bottom 133. A propeller 136 is disposed at the tip of the power transmission device 135. Directly attached (sail drive). With this configuration, the sailing ship 130 can be moved by driving the propeller 136 using the power generated by the engine 100.

  Engine 100 can also be used for propulsion mechanisms other than sail drives as described above. For example, it may be a stunning drive in which a power transmission device with a propeller directly attached is disposed behind the hull and the engine power is transmitted to the power transmission device from a power transmission shaft attached to the rear of the engine. Further, an angle type marine gear in which the propeller shaft is mounted obliquely downward on the rear end side of the power transmission device, or a parallel type marine gear in which the propeller shaft is horizontally mounted on the rear end side of the power transmission device may be used. .

  In addition, the present invention can be applied to an engine other than a sailing ship, for example, an engine of a steamer that is not provided with a sail and is powered only by an engine. Further, the present invention can be applied not only to a ship equipped with one engine but also to a ship engine equipped with a plurality of engines (for example, two, three).

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  The configuration in which the common rail 45 is arranged to be inclined is arbitrary, and a mounting base having a shape other than the mounting base 110 shown in the above embodiment can be used.

  The converging tool 47 may bundle all the fuel injection pipes 46 together. When the number of the fuel injection pipes 46 is large, the fuel injection pipes 46 may be bundled using three or more converging tools 47.

  The main body side connector 75 is not limited to a female connector and may be a male connector. Further, the number of connectors to be arranged and the arrangement method are also arbitrary.

  In the above description, the flow of taking in seawater from the outside of the ship was described assuming a ship navigating the sea. However, when the ship navigates a lake or river, water such as a lake is taken in instead of seawater. Therefore, the fresh water cooler 24 described above can also be expressed as a component that performs heat exchange between cooling water and outboard water.

  In the components other than those described here, the shape of the component can be changed or the component can be omitted. In addition, the arrangement of components can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Oil pan 2 Engine main body 3 Cylinder block 4 Cylinder head 5 Cylinder head cover 6 Top cover 10, 10x Inlet 11 Supercharger 12, 13 Intake pipe 14 Intake manifold 16 Exhaust manifold 24 Fresh water cooler 31 Oil filter 41 Fuel filter 43 Fuel pump 45 Common rail 100, 101 Engine 110 Mounting base

Claims (4)

An engine body arranged on a ship and including a cylinder block and a cylinder head;
A flywheel for transmitting power generated in the engine body;
A fresh water cooler that is disposed on the exhaust surface, which is the side of the engine body where the exhaust manifold is disposed, and performs heat exchange between cooling water and water taken from outside the ship,
An oil filter disposed on an intake surface which is a side surface opposite to the exhaust surface and on which an intake manifold is disposed;
A fuel pump disposed on the intake surface;
The intake surface, which is disposed on the flywheel side of the fuel pump and above the oil filter, and supplies the fuel supplied from the fuel pump to the cylinder head via a fuel injection pipe. A common rail to supply,
An engine comprising: The engine according to claim 1,
The engine is characterized in that the fuel injection pipe is attached at an end on the common rail side so as to be inclined so as to face away from the intake surface and upward. The engine according to claim 1 or 2,
The common rail is disposed below the intake manifold,
The engine, wherein a plurality of the fuel injection pipes are attached to the common rail, and each of the fuel injection pipes is bundled and fixed to a central portion of the intake manifold. The engine according to any one of claims 1 to 3,
An engine, wherein a fuel return pipe for returning the supplied fuel to a fuel tank is attached to an end of the common rail on the fuel pump side.

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