JP6928426B2 - Engine equipment - Google Patents

Description

The present invention relates to an engine device including a supercharger.

Conventionally, a supercharger that compresses fresh air with exhaust energy is mounted on an engine device in order to increase the air density in the cylinder of the engine for the purpose of improving engine output and fuel efficiency (see Patent Document 1). .. In a diesel engine, a large amount of high-density air is supplied into the cylinder to burn a large amount of fuel, which not only increases engine output and engine torque, but also promotes the mixing of fuel and air. It is also possible to suppress mixed combustion and reduce NOx (nitrogen oxide) emissions.

Japanese Unexamined Patent Publication No. 2013-133996

By the way, the mounting space of the engine varies depending on the work vehicle (construction machine, agricultural work machine, etc.) to be mounted, but in recent years, the mounting space is often limited (narrow) due to the demand for weight reduction and compactness. .. Therefore, it is necessary to lay out the engine components compactly. In particular, when a supercharger is mounted on an engine having a small displacement, the ratio of the supercharger on the engine surface becomes large, so it is necessary to lay out the supercharger and its related parts in a compact manner.

An object of the present invention is to provide an engine device which has been improved by examining the above-mentioned current situation.

The engine device according to the present invention is an engine device in which the exhaust side inlets of the supercharger are connected to exhaust manifolds provided on one left and right side surfaces of the engine, and the intake side inlets of the supercharger are the front and rear of the engine. While the downstream portion of the intake pipe, which is arranged toward one side surface and has an L-shaped bent shape, is piped in the front-rear direction of the engine and connected to the intake side inlet of the supercharger, the said The upstream side portion of the intake pipe is piped in the left-right direction and extends to the left and right other side surfaces of the engine, and the upstream side portion of the intake pipe is directed from the left and right one side surface side toward the left and right other side surfaces. It is inclined upward .

Further, the engine device of the present invention has, for example, a configuration in which cooling water pumps are arranged on one front and rear side surface of the engine, and a new air flow inlet and the cooling provided on the upstream side portion of the intake pipe. The cooling water inlet and the cooling water outlet of the water pump may be opened toward the left and right other side surfaces.

Further, the engine device of the present invention has, for example, a configuration in which a blow-by gas outlet for reducing blow-by gas leaking from the combustion chamber to the intake system is provided on a head cover arranged on the upper surface of the cylinder head. The blow-by gas return pipe extends from the blow-by gas outlet toward the front and rear sides of the engine and is connected to the intake pipe, and is inclined upward toward the intake pipe side. May be good.

Further, for example, the exhaust manifold is arranged on the side surface of the cylinder head, while the intake manifold having the intake inlet on the upper surface is arranged on the upper surface of the cylinder head at a position closer to the left and right other side surfaces than the blow-by gas outlet. The intake side outlet of the supercharger is opened diagonally upward toward the left and right other side surfaces, and is connected to the intake inlet of the intake manifold via an intake relay pipe. It may be.

Further, for example, the intake relay pipe may pass above the blow-by gas return pipe.

In the engine device of the present invention, the upstream portion of the intake pipe connected to the intake side inlet of the supercharger is piped in the left-right direction so as to extend to the left and right other side surfaces of the engine. The intake pipe connected to the machine can be laid out compactly without protruding from the front and rear sides of the engine. For example, even when the space between engine components such as cooling fans, fan shrouds, and radiators arranged on one side surface of the front and rear of the engine and the intake side inlet of the supercharger is narrow, the engine of the present invention In the device, since the upstream portion of the intake pipe extends to the left and right other side surfaces of the engine, it is possible to secure a space for connecting the pipe connected to the air cleaner to the intake pipe.

In the engine device of the present invention, if the upstream portion of the intake pipe is inclined upward from the left and right one side surface side toward the left and right other side surface sides, the height position of the intake side inlet of the supercharger, and by extension, Although it is a compact configuration that suppresses the height position of the supercharger without raising the height position of the supercharger itself, the space for arranging other components of the engine device below the upstream part of the intake pipe. Can be secured. In addition, the space between the new airflow inlet provided on the upstream side of the intake pipe and other components arranged below it can be increased, and the pipe connected to the air cleaner can be attached to and detached from the new airflow inlet of the intake pipe. It is possible to improve the convenience of the work by securing a space for the worker to put his / her hand in the work.

In the engine device of the present invention, if the new air flow inlet provided on the upstream side portion of the intake pipe and the cooling water inlet and the cooling water outlet of the cooling water pump are opened toward the left and right other side surfaces, the new system can be used. Installation work and maintenance work of each pipe connected to the airflow inlet, cooling water inlet and cooling water outlet can be performed from the same side of the engine (the left and right other side surfaces), and the efficiency of these works is improved. ..

In the engine device of the present invention, the blow-by gas return pipe extends from the blow-by gas outlet toward one front and rear side surface of the engine and is connected to the intake pipe, and is inclined upward toward the intake pipe side. By doing so, it is possible to prevent the lubricating oil and unburned fuel adhering to the inner wall of the blow-by gas return pipe from flowing into the intake pipe, and the lubricating oil etc. may be mixed into the combustion air (fresh air) supplied to the engine. , Dirt caused by lubricating oil in the intake system path can be reduced. Furthermore, since the upstream part of the intake pipe extends to the left and right other side surfaces of the engine, the blow-by gas return pipe connected to the intake pipe can be arranged linearly from the blow-by gas outlet in a plan view. The layout of the gas return pipe is easy and the pipe length can be shortened. By shortening the length of the blow-by gas return pipe, it is possible to avoid a blockage state of the blow-by gas return pipe due to freezing or bending of the blow-by gas return pipe. Further, since the blow-by gas return pipe is arranged directly above the head cover, it is possible to avoid a blocked state due to freezing of the blow-by gas return pipe due to heat dissipation of the engine.

Further, an intake manifold having an intake inlet on the upper surface is arranged on the upper surface of the cylinder head, and the intake side outlet of the supercharger is opened diagonally upward to the left and right other side surfaces, and intake air is taken through the intake relay pipe. If it is connected to the intake inlet of the manifold, the intake relay pipe will be compared with the configuration example in which the intake manifold is arranged on the side surface of the cylinder head and the configuration example in which the intake inlet is arranged on the side surface of the intake manifold. The length can be shortened to reduce the intake resistance. As a result, combustion air can be introduced into the engine without impairing the supercharging pressure obtained by the turbocharger. Furthermore, since both the intake side outlet of the turbocharger and the intake inlet of the intake manifold are opened upward (diagonally upward), the layout of the intake relay pipe is easy and the installation work of the intake relay pipe is easy. Improves sex.

Furthermore, if the intake relay pipe passes above the blow-by gas return pipe, the intake relay pipe is separated from the head cover to suppress the temperature rise of the combustion air due to the heat dissipation of the engine, and the space above the head cover is suppressed. Can be effectively used to arrange an intake relay pipe and a blow-by gas return pipe. Further, the blow-by gas return pipe can be arranged in a straight line to shorten the pipe length of the blow-by gas return pipe.

It is a front view of an engine. It is a rear view of an engine. It is a left side view of an engine. It is a right side view of an engine. It is a top view of an engine. It is a perspective view which looked at the engine diagonally from the front. It is a perspective view which looked at the engine diagonally from the rear. It is a top view which shows the intake manifold integrated with a valve arm chamber by a partial cross section. It is a left side sectional view of the intake manifold integrated with a valve arm chamber. It is a rear sectional view of the intake manifold integrated with a valve arm chamber. It is a perspective view which shows the valve arm chamber integrated intake manifold in cross section. It is a perspective view which shows the valve arm chamber of the valve arm chamber integrated intake manifold, and the blow-by gas reduction device in cross section. It is a perspective view of the valve arm chamber integrated intake manifold as seen from the bottom side. It is a perspective view which shows the blow-by gas reduction apparatus in cross section. It is a top view which shows the structure around the intake pipe. It is a front view which shows the structure around the intake pipe. It is a perspective view which shows the structure around the intake pipe. It is a perspective view which shows the intake manifold integrated with a valve arm chamber, an intake pipe, and a blow-by gas return pipe. It is a perspective view which shows the intake pipe and the blow-by gas return pipe in the cross section. It is a left side view which shows the exhaust system component. It is a perspective view which shows the exhaust system component. It is an exploded perspective view which shows the mounting structure of the exhaust system component. It is a rear view which shows the cylinder block in a partial cross section together with the exhaust system component.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. First, the schematic structure of the engine (engine device) 1 will be described with reference to FIGS. 1 to 7. In the following description, both sides along the output shaft 3 (both sides along the output shaft 3) are left and right, the cooling fan 9 placement side is the front side (one side side), and the fly wheel 11 placement side is the rear side. The exhaust manifold 7 arrangement side is referred to as the left side (one side side), and the fuel injection pump device 14 arrangement side is referred to as the right side (the other side side). It is the standard.

As shown in FIGS. 1 to 7, the engine 1 as a prime mover mounted on a work machine such as a construction civil engineering machine or an agricultural work machine has a cylinder block containing an output shaft 3 (crankshaft) and a piston (not shown). 4 is provided. The cylinder head 5 is mounted on the cylinder block 4. The exhaust manifold 7 is arranged on the left side surface of the cylinder head 5. An intake manifold 8 (head cover) integrated with a valve arm chamber is arranged on the upper surface of the cylinder head 5. The valve arm chamber integrated intake manifold 8 includes an intake manifold portion 6 extended in the front-rear direction on the left side portion and a valve arm chamber portion 90 extended in the front-rear direction on the right side portion. That is, above the cylinder head 5, the intake manifold portion 6 is arranged on the left side with respect to the output shaft 3 of the engine 1, and the valve operating chamber 90 is arranged on the right side (closer to the exhaust manifold 7). The valve arm chamber 90 covers an intake valve, an exhaust valve (not shown) and the like provided on the upper surface of the cylinder head 5.

A cooling fan 9 is provided on one side of the engine 1 that intersects with the output shaft 3, specifically, on the front side of the cylinder block 4. A mounting plate 10 is provided on the rear surface side of the cylinder block 4. The fly foil 11 is arranged so as to overlap the mounting plate 10. The fly foil 11 is pivotally supported on the output shaft 3. The power of the engine 1 is taken out from the operating portion of the working machine via the output shaft 3. An oil pan 12 is arranged below the cylinder block 4. The lubricating oil in the oil pan 12 is supplied to each lubricating portion of the engine 1 via an oil filter 13 arranged on the right side surface of the cylinder block 4. The oil pan 12 is connected to the cylinder block 4 via a spacer 71. The spacer 71 extends from the rear end of the cylinder block 4 to the lower part of the gear case 54. The gear case 54 connected to the front surface of the cylinder block 4 is also connected to the spacer 71.

An injector (fuel injection valve) 15 is provided on the right side of the upper surface of the cylinder head 5. In the example of this embodiment, the injector 15 for three cylinders is provided. Hereinafter, in the present embodiment, a 3-cylinder engine 1 will be described as an example, but the number of cylinders in the engine device of the present invention is not limited to 3 cylinders. A fuel tank (not shown) mounted on a working machine is connected to each injector 15 via a fuel injection pump device 14 and a fuel filter 17. The base end portion of the front hanging bracket 55 is bolted to the left side portion of the front surface of the cylinder head 5. The front hanging bracket 55 also serves as a support member for the alternator 23, which will be described later.

A fuel injection pump device 14 for supplying fuel to the combustion chamber in the cylinder block 4 is attached above the oil filter 13 (below the intake manifold portion 6) on the right side surface of the cylinder block 4. The fuel injection pump device 14 controls the operation of the governor, the injection pump main body 32 that supplies fuel to each injector 15 via the fuel injection pipe 36, the governor accommodating case 33 that accommodates the governor that adjusts the fuel injection amount, and the governor. It includes an actuator unit 34 and a fuel feed pump 35 that feeds fuel. The governor accommodating case 33 is detachably bolted to the rear surface of the injection pump main body 32. The actuator portion 34 is detachably bolted to the rear surface of the governor accommodating case 33. The fuel feed pump 35 is detachably bolted to the right side surface of the injection pump main body 32.

In the fuel injection pump device 33, the front surface of the injection pump body 32 is detachably bolted to the rear surface of the gear case 54, and the rear surface of the governor accommodating case 33 is attached to the right side surface of the cylinder head 5 via the L-shaped pump device bracket 41. It is detachably bolted to the rear part and attached to the engine 1. A gear train (not shown) including a crank gear, a cam gear, a pump gear, an idle gear, and the like is housed in a gear case 54 attached to a lower portion on the front surface of the cylinder block 4.

By driving the fuel feed pump 35, the fuel in the fuel tank (not shown) is sent from the fuel feed pump 35 to the injection pump main body 32 via the fuel feed pipe 37, the fuel filter 17, and the fuel relay pipe 38. Then, fuel is supplied from the injection pump main body 32 to each injector 15 via the fuel injection pipe 36. A fuel return pipe 39 is connected between the injection pump main body 32 and the fuel filter 17. A fuel return pipe 40 for returning the surplus fuel of the injector 15 is joined to the fuel return pipe 39 at a position near the injection pump main body 32. The surplus fuel of the engine 1 is returned to the fuel tank (not shown) via the fuel return pipes 39 and 40, the fuel return pipe joint 57 provided on the upper part of the fuel filter 17, and the like. The base end portion of the rear hanging bracket 56 is bolted to the right side portion of the rear surface of the cylinder head 5. The fuel filter 17 on the upper right side of the rear hanging bracket 56 is detachably bolted.

An engine starting starter 18 is provided on the mounting plate 10. The pinion gear of the engine starting starter 18 meshes with the ring gear of the fly foil 11. When starting the engine 1, the output shaft 3 starts rotating (so-called cranking is executed) by rotating the ring gear of the fly foil 11 with the rotational force of the engine starting starter 18.

A cooling water pump 21 is arranged coaxially with the fan shaft of the cooling fan 9 on the front side (cooling fan 9 side) of the cylinder head 5. An alternator 23 as a generator that generates electricity with the power of the engine 1 is provided on the left side of the engine 1, specifically, on the left side of the cooling water pump 21. The rotation of the output shaft 3 drives the cooling water pump 21 and the alternator 23 together with the cooling fan 9 via the cooling fan driving V-belt 22. The cooling water in the radiator 19 mounted on the work equipment side is supplied to the inside of the cylinder block 4 and the inside of the cylinder head 5 by the drive of the cooling water pump 21 to cool the engine 1. A part of the cooling water from the cooling water pump 21 is flowed to the oil cooler 83 arranged at the root of the oil filter 13 via the passage in the cylinder block 4 and the cooling water relay pipes 81 and 82.

As shown in FIGS. 3 and 4, two engine mount mounting portions 24 are provided in the front and rear portions on the lower portions of the left and right side surfaces of the cylinder block 4. For example, an engine mount (not shown) having anti-vibration rubber can be bolted to each engine mount mounting portion 24. In the embodiment, the cylinder block 4 is sandwiched between a pair of left and right engine support chassis 25 in the work machine, and the engine mount mounting portion 24 is bolted to each engine support chassis 25 via an engine mount (not shown). Both engine support chassis 25 of the machine support the engine 1.

A radiator 19 having a fan shroud 20 attached to the rear side is erected on the pair of left and right engine support chassis 25 so as to be located on the front side of the engine 1. The fan shroud 20 surrounds the outside (outer peripheral side) of the cooling fan 9 and communicates the radiator 19 and the cooling fan 9. Due to the rotation of the cooling fan 9, the cooling air blows on the radiator 19 and then flows from the radiator 19 to the engine 1 via the fan shroud 20.

An air cleaner (not shown) is connected to the inlet of the intake manifold portion 6 via an intake relay pipe 66, a compressor case 62 of the turbocharger 60, intake pipes 91, 92 and the like. The fresh air (external air) sucked into the air cleaner is dust-removed and purified by the air cleaner, and then the intake manifold portion 6 is passed through the intake pipes 91 and 92, the compressor case 62 (details will be described later), and the intake relay pipe 66. Is sent to and supplied to each cylinder of the engine 1.

In the above configuration, while fresh air is supplied from the air cleaner to the intake pipes 91 and 92, the first intake pipe is supplied from the blow-by gas outlet 67 provided in the valve arm chamber integrated intake manifold 8 via the blow-by gas return pipe 68. Blow-by gas is merged with 91. As described above, the valve arm chamber integrated intake manifold 8 includes an intake manifold portion 6 formed in the valve arm chamber integrated intake manifold 8 left side portion and a valve arm formed in the valve arm chamber integrated intake manifold 8 right side portion. The chamber 90 is integrally molded. Further, a blow-by gas reduction device 69 that separates the lubricating oil from the blow-by gas is provided on the upper surface of the valve arm chamber 90. By returning the blow-by gas provided in the blow-by gas reduction device 69 to the first intake pipe 91 and sending it to the combustion chamber again, the blow-by gas containing the exhaust gas and the unburned air-fuel mixture is prevented from being released to the atmosphere.

A turbocharger 60 is arranged on the left side of the cylinder head 5 and above the exhaust manifold 7. The turbocharger 60 includes a turbine case 61 with a built-in turbine foil, a compressor case 62 with a built-in blower foil, and a center housing 63 that is a connecting portion between the turbine case 61 and the compressor case 62. A lubricating oil feeding pipe 64 (lubricating pipe) that is branched from the lubricating oil feeding passage 79 (see FIG. 23) inside the cylinder block 4 and lubricates the rotating parts in the center housing 63 is connected to the upper part of the center housing 63. Has been done. A lubricating oil return pipe 65 for returning the lubricating oil lubricated into the center housing 63 to the lubricating oil return passage (not shown) inside the cylinder block 4 is connected to the lower part of the center housing 63.

The exhaust gas outlet portion of the exhaust manifold 7 is connected to the exhaust side inlet 61a of the turbine case 61. That is, the exhaust gas discharged from each cylinder of the engine 1 to the exhaust manifold 7 is discharged to the outside via the turbocharger 60. For example, a silencer or a tail pipe is connected to the exhaust side outlet 61b of the turbine case 61 via an exhaust pipe, and exhaust gas is sent to the outside from the exhaust side outlet 61b of the turbocharger 60 via the silencer or the tail pipe. Discharge.

The intake inlet 62a (intake side inlet of the supercharger) side of the compressor case 62 is connected to the fresh air outflow side of the air cleaner (not shown) via the second intake pipe 92, the first intake pipe 91 and the like. The intake outlet 62b (intake side outlet of the supercharger) side of the compressor case 62 is connected to the intake manifold portion 6 of the valve arm chamber integrated intake manifold 8 via the intake relay pipe 66. That is, the fresh air removed by the air cleaner is sent from the compressor case 62 to the intake manifold portion 6 via the intake relay pipe 66, and then supplied to each cylinder of the engine 1.

Next, the configuration of the valve arm chamber integrated intake manifold 8 will be described with reference to FIGS. 8 to 14. As described above, the valve arm chamber integrated intake manifold 8 includes an intake manifold portion 6 (intake manifold) extended in the front-rear direction on the left side portion and a valve arm chamber portion 90 extended in the front-rear direction on the right side portion. (Valve arm chamber) is provided. In the valve arm chamber integrated intake manifold 8, the intake manifold portion 6 and the valve arm chamber 90 are separated by a partition wall 101 to form a space in which the intake manifold 6 and the valve arm chamber 90 are closed to each other.

The upper surface of the intake manifold portion 6 is covered with the intake lid portion 102. The intake lid portion 102 is screwed to the upper surface of the side wall of the intake manifold portion 6 at two locations, and is bolted to the cylinder head 5 at six locations via the intake manifold portion 6. The valve arm chamber integrated intake manifold 8 is bolted to the cylinder head 5 at three locations on the peripheral edge portion on the valve arm chamber 90 side.

An intake inlet 103 is projected upward on the upper surface of the intake lid 102. Further, on the bottom surface of the intake manifold portion 6, three intake outlets 104 connected to intake intake ports for three cylinders provided on the upper surface of the cylinder head 5 are formed side by side in the front-rear direction of the engine 1. Two injector installation recesses 125 are provided on the right side surface of the intake manifold portion 6. The injector installation recess 125 is arranged at a position between the adjacent intake outlets 104 and 104. That is, in the example of the present embodiment, in the intake manifold portion 6 of the intake manifold 8, the two injector installation recesses 125 and the three intake outlets 104 are alternately arranged in the direction along the output shaft 3 of the engine 1. There is.

The injector installation recess 125 is formed by cutting out the bottom surface side portion of the intake manifold portion 6 from the right side surface to the partition wall 101. The cylinder head 5 and the injector installation recess 125 form a space for installing the injector 15 that is open on the right side. Then, the injector 15 is inserted into the cylinder head 5 below the injector installation recess 125. Since the right side of the injector installation recess 125 is open, the fuel injection pump device 14 and the fuel injection pipes 36 and the fuel return pipes 39 and 40 installed on the right side of the cylinder head 5 are short paths. In addition to being able to pipe with, the piping work can be simplified.

A blow-by gas reducing device 69 for reducing blow-by gas to the intake system is provided above the valve arm chamber 90. The blow-by gas reduction device 69 includes a gas outlet 111 in which a part of the upper surface of the valve arm chamber integrated intake manifold 8 is bulged upward. A gas pressure regulating valve 112 is arranged on the upper surface of the gas outlet 111. Further, a blow-by gas outlet 67 is provided on the left side surface of the gas outlet 111.

Inside the gas outlet 111, a gas outlet passage 111a, which partially serves as a pressure control chamber, and a gas outlet passage 111b connected to the blow-by gas outlet 67 are formed. The gas outlet passage 111a extends from the lower portion to the upper surface portion of the gas outlet portion 111 inside the gas outlet portion 111. Further, a part of the gas outlet passage 111a is formed in an annular shape so as to surround the opening of the gas outlet passage 111b at the upper surface portion of the gas outlet portion 111, and also serves as a pressure control chamber. The gas outlet passage 111b is guided downward from the upper surface portion of the gas outlet portion 111, and then is bent to the left side surface side of the gas outlet portion 111 and connected to the blow-by gas outlet 67.

The gas pressure regulating valve 112 includes a valve case 122 and a diaphragm 123 for pressure control. The valve case 122 is arranged on the upper surface of the gas outlet 111. The valve body 124 of the diaphragm 123 is arranged between the gas outlet passage 111a that also serves as the pressure control chamber and the gas outlet passage 111b that connects to the blow-by gas outlet 67. The flow between the gas outlet passage 111a and the gas outlet passage 111b is normally blocked by the valve body 124, and when the pressure in the outlet passage 111a exceeds a certain pressure, the diaphragm 123 is pressed upward and the valve body 124 is pressed. It is configured to move upward to open the valve and connect the lead-out passages 111a and 111b.

In the valve arm chamber 90, a gas introduction chamber 113 and an internal passage 114 are formed at the bottom of the gas lead-out portion 111. The blow-by gas leaked from the combustion chamber of the engine 1 or the like to the upper surface side of the cylinder head 5 is taken into the gas introduction chamber 113. The internal passage 114 connects between the gas outlet passage 111a and the gas introduction chamber 113. Further, a shielding plate 115 is fixed to the bottom of the gas lead-out portion 111 by screws 117. The gas introduction chamber 113 and the bottom surface side of the internal passage 114 are closed by the shielding plate 115 with respect to the upper surface side of the valve arm chamber 90.

A tubular gas introduction portion 116 is fixed to the opening on the bottom surface side of the gas introduction chamber 113 provided in the shielding plate 115. The gas introduction portion 116 is close to the inner wall on the left side surface in the valve arm chamber portion 90. The gas outlet of the gas introduction unit 116 is arranged in the gas introduction chamber 113. Further, the gas inlet of the gas introduction portion 116 is arranged at a position closer to the cylinder head 5 in the valve arm chamber portion 90. The gas introduction unit 116 is provided with a lid member at the upper end portion, and while preventing liquid lubricating oil from directly entering the gas introduction chamber 113 from the cylinder head 5 side, blow-by gas in the valve arm chamber portion 90 is blown into the valve arm chamber. It is introduced into the gas introduction chamber 113 of the blow-by gas reduction device 69 above the position near the cylinder head 5 in the section 90.

At the bottom of the gas lead-out portion 111, a partition wall 118 for partitioning between the gas introduction chamber 113 and the internal passage 114 is provided. The partition wall 118 is provided apart from the peripheral wall 119 of the blow-by gas reduction device 69, and forms a gas introduction chamber 113 and a plurality of internal passages 114 between the partition wall 118 and the peripheral wall 119. The plurality of internal passages 114 are arranged in a maze to form a labyrinth structure.

Oil trap materials 120 such as steel wool that capture the mist-like lubricating oil in the blow-by gas are arranged at two locations between the partition wall 118 and the peripheral wall 119. In this embodiment, the oil trap materials 120 are arranged in the front-rear direction of the engine 1 with the partition wall 118 interposed therebetween. The oil trap material 120 is arranged between the gas introduction chamber 113 and the internal passage 114.

As shown in FIG. 9, on the inner upper surface of the gas introduction chamber 113, beam-shaped partition walls 121 hanging downward and projecting are provided at two locations with the gas introduction portion 116 interposed therebetween. The beam-shaped partition wall 121 is erected between the oil trap material 120 and the gas introduction chamber 113 at a position above the oil trap material 120. The space surrounded by the peripheral wall 119, the upper surface of the oil trap material 120, and the beam-shaped partition wall 121 constitutes a part of the internal passage 114 through which blow-by gas flows.

The blow-by gas in the valve arm chamber 90 is introduced into the blow-by gas reduction device 69 from the gas outlet 111, and the gas inlet 113, the labyrinthine internal passage 114, the gas outlet passage 111a, the valve body 124 of the diaphragm 123, and the valve body 124 of the diaphragm 123. Through the gas outlet passage 111b, the lubricating oil component and the like are removed from each passage and the oil trap material 120, and the oil is sent to the blow-by gas outlet 67. The blow-by gas from which the lubricating oil component and the like have been removed is reduced from the blow-by gas outlet 67 to the intake system via the blow-by gas return pipe 68 (see FIG. 6).

In the engine 1 of this embodiment, since the valve arm chamber integrated intake manifold 8 integrally composed of the intake manifold portion 6 and the valve arm chamber portion 90 is arranged on the upper surface of the cylinder head 5, the intake manifold portion 6 and the engine 1 The valve arm chamber 90 can be laid out compactly. Further, the blow-by gas reduction device 69 is projected from the upper part of the valve arm chamber 90, and the blow-by gas return pipe 68 (gas pipeline) connected to the blow-by gas outlet 67 provided on the side surface of the blow-by gas reduction device 69. Since the blow-by gas is led out to the intake side inlet 62a of the turbocharger 60, the turbocharger 60 and the blow-by gas reduction device 69 can be arranged close to each other for a compact layout.

Further, by providing the blow-by gas outlet 67 on the side surface of the blow-by gas reduction device 69, it is possible to give a degree of freedom to the arrangement of the blow-by gas return pipe 68 connected to the blow-by gas outlet 67. Further, since the blow-by gas reduction device 69 is projected above the valve arm chamber 90, it is possible to prevent the volume inside the valve arm chamber 90 from becoming smaller due to the arrangement of the blow-by gas reduction device 69. As a result, the volume of the valve arm chamber 90 and, by extension, the external dimensions of the valve arm chamber integrated intake manifold 8 are not significantly increased, and the valve is sufficient for the increase in blow-by gas accompanying the installation of the turbocharger 60. The arm chamber volume can be secured.

Further, since the blow-by gas outlet 67 provided on the side surface of the blow-by gas reduction device 69 and the turbocharger 60 can be arranged close to each other, the layout of the blow-by gas return pipe 68 can be facilitated and the pipe length can be shortened. By shortening the length of the blow-by gas return pipe 68, it is possible to avoid a blocked state of the blow-by gas return pipe 68 due to freezing or bending of the blow-by gas return pipe 68.

Further, in the engine 1 of this embodiment, since the plurality of internal passages 114 in the blow-by gas reduction device 69 form a labyrinth-like labyrinth structure, the labyrinth structure is formed in the blow-by gas reduction device 69. The labyrinth structure can be made compact without significantly increasing the volume of the valve arm chamber 90 and, by extension, the external dimensions of the valve arm chamber integrated intake manifold 8, and the lubricating oil and unburned fuel contained in the blow-by gas, etc. Can be removed by the above labyrinth structure.

Further, in the engine 1 of this embodiment, since the oil trap material 120 is arranged between the partition wall 118 partitioning between the gas introduction chamber 113 and the internal passage 114 and the peripheral wall 119 of the blow-by gas reduction device 69, the partition wall The blow-by gas flowing from the gas outlet of the gas introduction unit 116 to the internal passage 114 by bypassing 118 can be made to pass through the oil trap material 120, and the lubricating oil and the like contained in the blow-by gas are removed by the oil trap material 120. can.

Further, in the engine 1 of this embodiment, the beam-shaped partition wall 121 erected above the oil trap material 120 between the oil trap material 120 and the gas introduction chamber 113, the upper surface of the oil trap material 120, and the peripheral wall. Since the space surrounded by 119 is a part of the internal passage 114, the blow-by gas passes from the gas outlet of the gas introduction portion 116 through the inside of the gas introduction chamber 113 and the oil trap material 120 to the upper surface side of the oil trap material 120. It can be circulated and the lubricating oil and the like contained in the blow-by gas can be removed by the oil trap material 120.

Next, the configuration of the intake pipe and its surroundings will be described with reference to FIGS. 15 to 19. In the engine 1 of this embodiment, the first intake pipe 91 to which one end (upstream side) is connected to the air cleaner (not shown) is arranged at a position between the cooling fan 9 and the blow-by gas outlet 67. Specifically, the first intake pipe 91 is arranged at a position above the cooling water pump 21 on the front side (one side surface side of the front and rear) of the engine 1. One end of the first intake pipe 91 constitutes a new air flow inlet 91a.

The first intake pipe 91 is made of metal, for example, and has a substantially T-shape in appearance. The new air flow inlet 91a of the first intake pipe 91 is opened toward the right side (left and right other side surfaces) of the engine 1. The new airflow outlet 91b provided at the other end (downstream side) of the first intake pipe 91 facing the new airflow inlet 91a is opened toward the left side (one side surface side on the left and right) of the engine 1. The appearance of the first intake pipe 91 between the new air flow inlet 91a and the new air flow outlet 92b has a linear substantially cylindrical shape.

A substantially cylindrical connecting portion 91c is integrally formed on the outer peripheral surface of the first intake pipe 91 so as to project outward. The connecting portion 91c is provided at a portion near the new air flow outlet 91b in the central portion of the first intake pipe 91. The blow-by gas inflow port 91d on the tip side of the connecting portion 91c is opened toward the blow-by gas outlet 67 side (rear side of the engine 1). The other end of the blow-by gas return pipe 68, one end of which is connected to the blow-by gas outlet 67, is connected to the blow-by gas inflow port 91d.

The new airflow outlet 91b of the first intake pipe 91 is connected to the new airflow inlet 92a provided at one end of the second intake pipe 92. The second intake pipe 92 is made of resin, for example, and has a substantially L shape. The new airflow outlet 92b provided at the other end of the second intake pipe 92 is connected to the intake inlet 62a of the compressor case 62 of the turbocharger 60. The intake inlet 62a of the compressor case 62 is opened toward the cooling fan 9 side. The second intake pipe 92 is formed so that one end 92a side is long and the other end 92b side is short with respect to the curved portion.

As described above, in the engine 1 of this embodiment, the upstream portion of the second intake pipe 92 connected to the intake inlet 62a of the turbocharger 60 and the first intake pipe 91 are piped in the left-right direction to form the engine 1. Since it extends to the right side surface, the intake pipes 91 and 92 connected to the turbocharger 60 can be laid out compactly without protruding from the front side surface of the engine 1.

By the way, conventionally, when a supercharger is mounted on an engine having a small exhaust amount of 3 cylinders or less, if a linear intake pipe is attached to the intake side inlet of the supercharger, it is arranged on one side surface side of the front and rear of the engine. In some cases, it became difficult to install the intake pipe because the space between the engine components such as the cooling fan, fan shroud, and radiator and the intake side inlet of the turbocharger became narrow. The engine 1 of this embodiment includes engine components such as a cooling fan 9, a fan shroud 20, and a radiator 19 (see FIGS. 3 and 4) arranged in front of the engine 1, and an intake inlet 62a of the turbocharger 60. Even when the space between the air cleaner (not shown) is narrow, it is possible to secure a space for connecting the fresh air pipe 99 (see FIG. 17) connected to the air cleaner (see FIG. 17) to the first intake pipe 91, and to the first intake pipe 91. The convenience of the installation work and the removal work of the fresh air pipe 99 is improved.

Further, as shown in FIGS. 15 to 18, the blow-by gas return pipe 68 extends from the blow-by gas outlet 67 toward the front side of the engine 1 and is connected to the connection portion 91c of the first intake pipe 91. The first intake pipe 91 is inclined upward toward the connection portion 91c side. As a result, it is possible to prevent the lubricating oil and unburned fuel adhering to the inner wall of the blow-by gas return pipe 68 from flowing into the first intake pipe 91, and lubricate the combustion air (fresh air) supplied to the engine 1. It is possible to reduce the mixing of oil and the like and the contamination by the lubricating oil and the like in the intake system path including the compressor case 62 and the like of the turbocharger 60. Further, the blow-by gas return pipe 68 connected to the connection portion 91c of the first intake pipe 91 by extending the upstream side portion of the series of intake pipes 91 and 92 to the right side surface side of the engine 1 in the left-right direction. Can be arranged linearly in a plan view from the blow-by gas outlet 67, the layout of the blow-by gas return pipe 68 can be easily performed, and the pipe length can be shortened. By shortening the length of the blow-by gas return pipe 68, it is possible to avoid a blocked state of the blow-by gas return pipe 68 due to freezing or bending of the blow-by gas return pipe 68. Further, since the blow-by gas return pipe 68 is arranged directly above the valve arm chamber integrated intake manifold 8, it is possible to avoid a blocked state due to freezing of the blow-by gas return pipe 68 due to heat dissipation from the engine 1. Further, since most of the blow-by gas return pipe 68 is arranged so as to overlap the first intake pipe 91 in front view and the area of the blow-by gas return pipe 68 exposed to the cooling fan 9 is small, the blow-by caused by the cooling air is generated. It contributes to the prevention of freezing of the gas return pipe 68.

As shown in FIGS. 15 to 17, an intake manifold portion 6 having an intake inlet 103 on the upper surface is arranged on the upper surface of the cylinder head 5, and the intake outlet 62b of the turbocharger 60 is obliquely upward toward the right side surface side of the engine 1. It is open toward. The intake inlet 103 and the intake outlet 62b are connected by an intake relay pipe 66. The intake relay pipe 66 extends diagonally upward from the intake outlet 62b toward the right side of the engine 1 and is guided above the blow-by gas return pipe 68, and is curved in the horizontal direction above the blow-by gas return pipe 68. .. Further, the intake relay pipe 66 is guided above the front portion of the intake manifold portion 6 and curved toward the rear side of the engine 1, and further guided above the intake inlet 103 and curved downward to the intake inlet 103. It is connected. As a result, the length of the intake relay pipe 66 is shortened to reduce the intake resistance as compared with the configuration example in which the intake manifold is arranged on the side surface of the cylinder head and the configuration example in which the intake inlet is arranged on the side surface of the intake manifold. Therefore, combustion air can be introduced into the engine 1 without impairing the supercharging pressure obtained by the turbocharger 60. Further, since the intake outlet 62b of the turbocharger 60 and the intake inlet 103 of the intake manifold portion 6 are both opened upward (diagonally upward), the layout of the intake relay pipe 66 is easy and the intake relay is relayed. The convenience of the installation work of the pipe 66 is improved.

As shown in FIGS. 5, 6 and 15 to 17, the intake relay pipe 66 passes above the valve arm chamber integrated intake manifold 8 and above the blow-by gas return pipe 68. As a result, the intake relay pipe 66 is separated from the head cover to suppress the temperature rise of the combustion air due to the heat radiation of the engine 1, and the space above the valve arm chamber integrated intake manifold 8 is effectively utilized to effectively utilize the intake relay pipe 66. And the blow-by gas return pipe 68 can be arranged. Further, the blow-by gas return pipe 68 can be arranged in a straight line to shorten the pipe length of the blow-by gas return pipe 68.

As shown in FIGS. 16 and 17, the cooling water pump 21 includes a thermostat case 85 for accommodating the thermostat. A thermostat cover 86 having a cooling water outlet 21b connected to a cooling water pipe connected to the radiator 19 is provided above the thermostat case 85. The thermostat cover 86 is arranged below the first intake pipe 91. The thermostat case 85 and the thermostat cover 86 form a part of the cooling water pump 21.

The cooling water pump 21 includes a cooling water inlet 21a and a cooling water outlet 21b to which a cooling water feed pipe 87 connected to a radiator 19 (see FIGS. 3 and 4) and a cooling water return pipe 88 are connected. The cooling water inlet 21a is provided in the main body of the cooling water pump 21. The cooling water outlet 21b is provided on the thermostat cover 86. Both the cooling water inlet 21a and the cooling water outlet 21b are opened toward the right side of the engine 1.

As shown in FIG. 16, the upstream side portions of the series of intake pipes 91 and 92 are inclined upward from the left side surface side of the engine 1 toward the right side surface side of the engine 1. As a result, the height position of the intake inlet 62a of the turbocharger 60, and by extension, the height position of the turbocharger 60 itself is not raised, and the height position of the turbocharger 60 is suppressed in a compact configuration. However, it is possible to secure a space for arranging another component of the engine 1 below the upstream portion of the intake pipes 91 and 92, that is, the thermostat cover 86 having the cooling water outlet 21b in this embodiment. Further, the space between the new air flow inlet 91a provided in the upstream portion of the intake pipes 91 and 92 and other components arranged below the new air flow inlet 91a, and in this embodiment, the thermostat cover 86 can be increased, and the air cleaner (air cleaner ( It is possible to secure a space for the operator to put his / her hand when attaching / detaching the fresh air pipe 99 connected to the fresh air pipe 99 (not shown) to / from the new air flow inlet 91a of the first intake pipe 91, and improve the convenience of the work.

Further, in the engine 1 of this embodiment, the new air flow inlet 91a of the first intake pipe 91, the cooling water inlet 21a of the cooling water pump 21, and the cooling water outlet 21b are opened toward the right side of the engine 1. As a result, installation work and maintenance work of the fresh air pipe 99 connected to the new air flow inlet 91a, the cooling water feed pipe 87 connected to the cooling water inlet 21a, and the cooling water return pipe 88 connected to the cooling water outlet 21b can be performed. This can be performed from the same side of the engine 1 (in this embodiment, the right side of the engine 1), and the efficiency of these operations is improved.

As shown in FIGS. 15 and 19, a partition wall 91e is formed inside the first intake pipe 91. The partition wall 91e is formed from the new airflow inlet 91a toward the new airflow outlet 91b, and blow-by the internal space of the first intake pipe 91 with the fresh air flow space 91f connecting the new airflow inlet 91a to the new airflow outlet 91b. It is separated into a blow-by gas flow space 91g connected from the gas inflow port 91d to the new airflow outlet 91b. Since the first intake pipe 91 has such a structure, it is also called a three-way valve. With such a structure of the first intake pipe 91, the backflow of the blow-by gas introduced into the first intake pipe 91 from the blow-by gas inflow port 91d to the new air flow port 91a side is suppressed.

As shown in FIGS. 15 to 17, in the example of the present embodiment, the first intake pipe 91 is formed with a sensor mounting seat 94 for mounting the temperature sensor 93. The temperature sensor 93 is attached to the sensor mounting seat 94, and the sensor portion is inserted into the first intake pipe 91 to measure the air temperature flowing in the fresh air flow space 91f. Since the sensor portion of the temperature sensor 93 is arranged in the fresh air circulation space 91f separated from the blow-by gas flow space 91g, the sensor portion is prevented from being contaminated by the lubricating oil component or the like contained in the blow-by gas.

Next, the configuration of the exhaust system parts and their surroundings will be described with reference to FIGS. 20 to 23. The exhaust inlet 61a of the turbocharger 60 is connected to the exhaust gas outlet 130 (exhaust side outlet) provided on the upper surface of the exhaust manifold 7. The exhaust manifold 7 having the exhaust gas inlets 131 for three cylinders is fixed to the left side surface of the cylinder head 5 by six mounting bolts 132. The exhaust manifold 7 is provided with two bolt insertion holes for sandwiching the exhaust gas inlet 131 in the vertical direction at each peripheral portion of the exhaust gas inlet 131. The bottom surface side of the exhaust manifold 7 is formed in a bifurcated shape of a front branch portion 133 and a rear branch portion 134 below the exhaust gas outlet 130. The exhaust gas inlet 131 for one cylinder is arranged at the front branch portion 133, and the exhaust gas inlet 131 for two cylinders is arranged at the rear branch portion 134.

The lubricating oil feed pipe 64 and the lubricating oil return pipe 65 are connected to the center housing 63 of the turbocharger 60. One end of the lubricating oil feed pipe 64 is a portion closer to the rear of the central portion on the right side surface of the cylinder block 4, and is connected to the lubricating oil feed passage 79 (see FIG. 23) inside the cylinder block 4 by a lubricating oil introduction joint 135. The other end of the lubricating oil feed pipe 64 is connected to the upper part of the center housing 63 by a lubricating oil outlet joint 136.

After being guided upward from the lubricating oil introduction joint 135, the lubricating oil feed pipe 64 is bent diagonally upward rearward and guided to the vicinity of a portion near the rear of the upper end of the right side surface of the cylinder block 4. Further, the lubricating oil feed pipe 64 is guided from the right side surface of the cylinder block 4 to the left side surface side via the rear side surface along the upper end portion of the cylinder block 4. The middle portion of the lubricating oil feed pipe 64 is fixed at a position facing the upper end of the rear side surface of the cylinder block 4 by a pipe locking member 137 bolted to the cylinder head 5. The lubricating oil feed pipe 64 guided to the left side surface side of the cylinder block 4 is bent upward on the rear side of the exhaust manifold 7, and then guided to a position higher than the upper surface of the cylinder head 5 and bent forward. There is. Further, the lubricating oil feed pipe 64 is guided to a position between the exhaust gas outlet 130 and the left side surface of the valve arm chamber integrated intake manifold 8 by passing above the rear branch portion 134 of the exhaust manifold 7, and is guided from there to the front. After being guided obliquely upward, it is bent diagonally upward to the left and further bent substantially horizontally, and is connected to a lubricating oil lead-out joint 136 attached to the center housing 63 of the turbocharger 60.

In this way, the lubricating oil feed pipe 64 is laid by bypassing the rear side surface of the engine 1 from the right side surface to the left side surface of the engine 1, and is also piped from the rear side of the exhaust manifold 7 on the left side surface of the engine 1. It bypasses the outer periphery of the exhaust manifold 7 and is laid toward the upper side of the exhaust manifold 7, and is compactly arranged along the side surface of the engine 1. Further, since the lubricating oil feed pipe 64 is laid around the outer periphery of the exhaust manifold 7, the lubricating oil feed pipe 64 is attached to the engine 1 by the lubricating oil introduction joint 135 and the pipe locking member 137. However, the lubricating oil feed pipe 64 does not become an obstacle during the installation work of the exhaust manifold 7, and the efficiency of the assembly work of the engine 1 is improved.

One end of the lubricating oil return pipe 65 is connected to a pipe flange member 138 bolted to the lower part of the center housing 63, and the other end is a lubricating oil return joint 140 via an elastic piping member 139 having elasticity made of, for example, rubber resin. It is connected to the. After being guided downward from the pipe flange member 138, the lubricating oil return pipe 65 is bent diagonally downward to the rear and is guided to the left side of the exhaust manifold 7 and below the exhaust gas outlet 130. Further, the lubricating oil return pipe 65 is guided diagonally downward to the right toward the branch portions of the front branch portion 133 and the rear branch portion 134 along the left side surface of the exhaust manifold 7, and is oblique to the right below the exhaust manifold 7. It is bent forward and diagonally downward to the right to be guided to the vicinity of the left side surface of the cylinder block 4, and is further bent downward to be connected to one end of the elastic piping member 139. The elastic piping member 139 has a cylindrical shape and is piped in the vertical direction. The other end of the elastic piping member 139 is connected to a lubricating oil return joint 140 arranged at a portion near the center of the right side surface of the cylinder block 4. The lubricating oil return joint 140 is arranged below the center housing 63 when viewed from the left side.

In the engine 1 of this embodiment, since the lubricating oil return pipe 65 for extracting the lubricating oil from the turbocharger 60 is piped downward along the bifurcated portion on the bottom surface of the exhaust manifold 7, the lubricating oil return pipe 65 can be compactly piped close to the left side surface of the engine 1.

By the way, in recent years, the engine has become more compact by adding a supercharger against the background of market demands such as low fuel consumption and low cost, and it is expected that the number of engines with a small displacement supercharger will increase significantly. On the other hand, conventionally, the specifications and production volume of small displacement industrial diesel engines with a supercharger are small, and when a supercharger is installed in the engine, the assembly of the supercharger peripheral parts is an extension of the naturally aspirated engine. It was set to take steps with the exhaust manifold, turbocharger, and lubricating oil pipe. Therefore, the assembly of the peripheral parts of the turbocharger is carried out from the assembly line once in a separate assembly cell for the turbocharger specifications, and it takes time, and the conventional assembly method takes time, so the required production number. Cannot be supported.

In response to such a requirement, in the engine 1 of this embodiment, improvements have been made so that the exhaust manifold 7, the turbocharger 60, and the lubricating oil return pipe 65 can be assembled in the engine 1 in a assembled state. As shown in FIG. 20, the component layout of the exhaust manifold 7, the turbocharger 60, and the lubricating oil return pipe 65 is viewed from the left side of the engine 1 so as not to hinder the attachment of the exhaust manifold 7 to the cylinder head 5. The mounting bolt 132 is exposed. Further, the lubricating oil return pipe 65 is an elastic piping member so that the operator can perform the bolt tightening work of the exhaust manifold 7 by himself while the exhaust manifold 7, the turbocharger 60 and the lubricating oil return pipe 65 are assembled. It is connected to the lubricating oil return joint 140 via 139. The operator can first connect the lubricating oil return joint 140 to the cylinder block 4 to use the lubricating oil return pipe 65, the elastic piping member 139 and the lubricating oil return joint 140 as one of the supports during assembly, and the elastic piping member 139. Is deformed, so that irreversible plastic deformation of the lubricating oil return pipe 65 can be prevented.

This makes it easier for one operator to assemble the assembled parts of the exhaust manifold 7, turbocharger 60, and lubricating oil return pipe 65 to the engine 1, and plans to produce the assembled parts of the exhaust system. By assembling in advance according to the above, it is possible to centralize the assembly work and smooth the line work. Furthermore, the increase in assembly man-hours from the naturally aspirated specification of the engine with a supercharger can be minimized on the line, and it is possible to respond to the increase in production. Further, the assembly process carried out in the assembly space dedicated to the supercharger specification is carried out by assembling the exhaust manifold 7, the turbocharger 60 and the lubricating oil return pipe 65, and the exhaust system parts such as the lubricating oil feed pipe 64. By limiting to the mounting process, it is possible to save space at the assembly site.

The configuration of each part in the present invention is not limited to the illustrated embodiment, and various changes can be made without departing from the spirit of the present invention. The engine device of the present invention is mounted on a work machine such as a lawn mower, a construction civil engineering machine, an agricultural work machine, and an engine generator.

1 Engine 4 Cylinder block 5 Cylinder head 6 Intake manifold (intake manifold)
7 Exhaust manifold 8 Valve arm chamber integrated intake manifold (head cover)
19 Radiator 20 Fan shroud 21 Cooling water pump 21a Cooling water inlet 21b Cooling water outlet 60 Turbocharger 61a Exhaust inlet (exhaust side inlet)
61b Exhaust outlet 62a Intake inlet (intake side inlet)
62b Intake outlet (intake side outlet)
64 Lubricating oil feed pipe (lubrication pipe)
65 Lubricating oil return pipe (return pipe)
66 Intake relay pipe 67 Blow-by gas outlet 68 Blow-by gas return pipe 69 Blow-by gas reduction device 90 Valve arm chamber (valve arm chamber)
91 1st intake pipe 91a New air flow inlet 92 2nd intake pipe 92b New air flow outlet 101 Partition 130 Exhaust gas outlet (exhaust side outlet)
131 Exhaust gas inlet 139 Elastic piping member

Claims (5)

In an engine device in which the exhaust side inlet of the turbocharger is connected to the exhaust manifolds provided on the left and right sides of the engine.
The intake side inlet of the supercharger is arranged toward one front and rear side surface of the engine.
The downstream part of the intake pipe having an L-shaped bend is piped in the front-rear direction of the engine and connected to the intake side inlet of the supercharger, while the upstream part of the intake pipe is left and right. It is piped in the direction and extends to the left and right sides of the engine.
The blow-by gas outlet for returning the blow-by gas leaking from the combustion chamber to the intake system is provided on the head cover arranged on the upper surface of the cylinder head.
An engine device in which a blow-by gas return pipe extends from the blow-by gas outlet toward the front and rear sides of the engine and is connected to the intake pipe. A configuration in which the cooling water pump is disposed on the front and back one side of the front SL engine,
The engine device according to claim 1, wherein a new air flow inlet provided on the upstream side portion of the intake pipe and a cooling water inlet and a cooling water outlet of the cooling water pump are opened toward the left and right other side surfaces. The engine device according to claim 1 or 2, wherein the blow-by gas return pipe is inclined upward toward the intake pipe side. While the exhaust manifold is arranged on the side surface of the cylinder head, the intake manifold having an intake inlet on the upper surface is arranged on the upper surface of the cylinder head at a position closer to the left and right other side surfaces than the blow-by gas outlet.
Claims 1 to 3 that the intake side outlet of the supercharger is opened diagonally upward toward the left and right other side surfaces and is connected to the intake inlet of the intake manifold via an intake relay pipe. The engine device according to any one of the above. The engine device according to claim 4, wherein the intake relay pipe passes above the blow-by gas return pipe.

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