JP6233963B2 - Engine equipment - Google Patents

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JP6233963B2
JP6233963B2 JP2013242243A JP2013242243A JP6233963B2 JP 6233963 B2 JP6233963 B2 JP 6233963B2 JP 2013242243 A JP2013242243 A JP 2013242243A JP 2013242243 A JP2013242243 A JP 2013242243A JP 6233963 B2 JP6233963 B2 JP 6233963B2
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exhaust
exhaust gas
engine
pipe
cooling water
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JP2015101998A (en
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匡孝 光田
匡孝 光田
北斗 日下
北斗 日下
田口 功
功 田口
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ヤンマー株式会社
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Description

  The present invention relates to an engine device such as a diesel engine provided with an exhaust gas purification device, and more particularly to an engine device mounted on a work machine such as a wheel loader, a backhoe or a forklift car.

  Conventionally, an exhaust gas purification device (diesel particulate filter) is provided in an exhaust path of an engine, and a technology for purifying exhaust gas discharged from a diesel engine by an oxidation catalyst or a soot filter of the exhaust gas purification device has been known. It has been developed (see, for example, Patent Document 1). Further, in recent years, in the field of work machines such as construction machines and agricultural machines, it is required to provide an exhaust gas purifying device in a diesel engine used in the machine for environmental measures (for example, Patent Documents). 2).

JP 2000-145430 A JP 2007-182705 A

  By the way, when the exhaust gas purification device is provided, if the exhaust gas purification device is simply arranged in the exhaust path of the engine instead of the silencer (muffler), the exhaust gas purification device is much heavier than the silencer. . Therefore, even if the silencer support structure in the construction machine disclosed in Patent Document 2 is diverted to the exhaust gas purification apparatus support structure, there is a problem that the exhaust gas purification apparatus cannot be assembled stably. In particular, in a work machine such as a wheel loader, in order to reduce the turning radius in order to prevent contact with the surroundings, the traveling machine body itself is required to be compact, and the engine mounting space is limited.

  Accordingly, the present invention seeks to provide an engine device that has been improved by examining these current conditions.

The present invention is attached to an exhaust gas purification device that processes exhaust gas from an exhaust manifold of an engine, an exhaust throttle device interposed between the exhaust gas purification device and the exhaust manifold, and a front side surface of the engine An engine device comprising a flywheel housing and a cooling water pump attached to the rear of the engine, wherein the exhaust gas purification device is mounted in the left-right direction on the flywheel housing. The exhaust throttle device is configured by connecting a throttle valve case and an actuator case behind the throttle valve case with a water cooling case, and opens upward. The exhaust inlet side of the throttle valve case is connected to the exhaust outlet of the exhaust manifold, and the exhaust of the throttle valve case is connected. An opening on the lower surface side of the relay pipe is connected to the outlet side, a lateral opening of the relay pipe opened forward is connected to the purification inlet pipe, and the actuator case is located on the left and right of the engine relative to the throttle valve case. together it is disposed outside, the cooling water outlet pipe and the cooling water inlet pipe of the cooling pipe which projects rearward from the rear water cooling case is disposed between the engine and the actuator casing, the cooling water The outlet pipe is connected to the cooling water pump, the cooling water inlet pipe is connected to an EGR cooler disposed below the exhaust manifold, and cooling water from the cooling water pump is supplied to a water cooling section of the engine. In addition to being supplied, a part thereof is configured to be sent to the EGR cooler and the exhaust throttle device .

According to the present invention, the engine room structure surrounding the engine can be easily configured by the machine frame, but the assembly workability of the engine in which the exhaust gas processing device is arranged can be easily improved.

According to the present invention, a piping space for cooling water connected between the engine and the exhaust throttle device can be secured, and the cooling water piping is easily prevented from being damaged by contact with the engine due to mechanical vibration. it can.

It is a right view of the diesel engine of this invention. It is the left side view. It is the same top view. It is the same rear view. It is the same front view. It is a left view of the diesel engine which removed the oil filter. It is a top view of the diesel engine which removed the oil filter. It is a front perspective view of the diesel engine of the present invention. It is the same rear perspective view. It is an enlarged view of the same plane perspective view. FIG. 4 is a partially enlarged view of FIG. 3. 1 is an external perspective view of an exhaust gas purification device. It is assembly (disassembly) explanatory drawing of an exhaust-gas purification apparatus. It is an enlarged view for demonstrating the structure of the attaching part on a flywheel housing. It is a left view of the wheel loader used as an example of the working machine carrying a diesel engine. It is a top view of the wheel loader shown in FIG. It is an enlarged view of the right side surface of the wheel loader shown in FIG. 15 for demonstrating rotation of a seat frame. It is an enlarged view of the right side surface of the wheel loader shown in FIG. 15 for demonstrating rotation of a bonnet cover. It is a side view of the forklift car used as another example of the working machine carrying a diesel engine. It is a top view of the forklift car of FIG.

  Hereinafter, with reference to FIGS. 1-18, embodiment of the working machine provided with the engine apparatus of this invention and the said engine apparatus is described based on drawing. In the following, a wheel loader including a loader device as a working unit is taken as an example of the working machine in the present embodiment, and the details of the configuration will be described.

  First, referring to FIG. 1 to FIG. 11, as an example, a diesel engine 1 mounted as a prime mover on a work machine such as a wheel loader 211 (see FIG. 16 and FIG. 17) described later, This will be described below. As described above, the diesel engine 1 includes the exhaust gas purification device 2 connected via the exhaust throttle device 65. The exhaust gas purification device 2 acts to reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 1 in addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 1. Is provided.

  The diesel engine 1 includes a cylinder block 4 that incorporates an engine output crankshaft 3 and a piston (not shown). A cylinder head 5 is mounted on the cylinder block 4. An intake manifold 6 is disposed on the left side surface of the cylinder head 5. An exhaust manifold 7 is disposed on the right side surface of the cylinder head 5. A head cover 8 is disposed on the upper side surface of the cylinder head 5. A cooling fan 9 is provided on the rear side of the cylinder block 4. A flywheel housing 10 is provided on the front side of the cylinder block 4. A flywheel 11 is disposed in the flywheel housing 10. The flywheel 11 is pivotally supported on the crankshaft 3 (engine output shaft). The power of the diesel engine 1 is taken out via the crankshaft 3 to the working part of a work vehicle (backhoe, forklift, etc.).

  An oil pan 12 is disposed on the lower surface of the cylinder block 4. Lubricating oil is stored in the oil pan 12. Lubricating oil in the oil pan 12 is sucked by an oil pump (not shown) disposed near the left side surface in the cylinder block 4, and an oil cooler 18 and an oil filter disposed on the left side surface of the cylinder block 4. 13 is supplied to each lubrication part of the diesel engine 70. The lubricating oil supplied to each lubricating part is then returned to the oil pan 12. The oil pump (not shown) is configured to be driven by rotation of the crankshaft 3. The oil cooler 18 is for cooling the lubricating oil with cooling water.

  As shown in FIGS. 2 and 4, the oil cooler 18 is attached to the left side surface of the cylinder block 4 above the oil pan 12. The oil cooler 18 has a structure in which cooling water pipes 18a and 18b are connected to the lower side thereof, and the cooling water circulates in the inside thereof. The oil cooler 18 has an oil pipe connection 18d connected to the oil pipes 13a and 13b above the cooling water pipe connection 18c to the cooling water pipes 18a and 18b. Therefore, the oil cooler 18 is connected to the oil filter 13 disposed above the cylinder block 4 by being connected by the oil pipes 13a and 13b and the oil pipe connecting portion 18d.

  As shown in FIGS. 2 to 4, the oil filter 13 is disposed at a position spaced from the left side surface of the cylinder head 5 to the left side. The oil filter 13 is disposed at substantially the same height as the head cover 8, and is remotely disposed with respect to the oil cooler 18 below the left side surface of the cylinder block 4. The oil filter 13 has a configuration in which the oil pipe connection portion 13c connected to the oil pipes 13a and 13b is on the upper side and the filter portion 13d excluding lubricating oil impurities is on the lower side. That is, the oil filter 13 is disposed at a position spaced apart from the left side surface of the diesel engine 1 and at a position higher than the upper surface height of the diesel engine 1 (the height of the upper surface of the head cover 9), the oil pipes 13a and 13b. It is linked with.

  Therefore, as shown in FIG. 4, when the diesel engine 1 is mounted on the body frame 94, the oil filter 13 can be disposed outside the body frame 94. That is, the left side surface of the diesel engine 1 is covered with the inner surface of the body frame 94, while the oil filter 13 is disposed outside the body frame 94. The oil pipes 13a and 13b are piped from the lower side to the upper side along the inner side surface of the body frame 94, so that the oil filter 13 is oiled at a position on the upper side of the body frame 94. Connect to cooler 18. Thereby, when exchanging the filter part 13d of the oil filter 13, since the operator can work outside the machine body frame 94, workability and maintainability can be improved.

  As shown in FIGS. 2 and 6, a fuel supply pump 14 for supplying fuel is attached to the left side surface of the cylinder block 4 above the oil cooler 18 (below the intake manifold 6). The diesel engine 1 is provided with injectors 15 for four cylinders each having an electromagnetic opening / closing control type fuel injection valve (not shown). A fuel tank (not shown) mounted on the work vehicle is connected to each injector 15 via a fuel supply pump 14, a cylindrical common rail 16 and a fuel filter (not shown).

  Fuel in the fuel tank is pumped from the fuel supply pump 14 to the common rail 16, and high-pressure fuel is stored in the common rail 16. By controlling the fuel injection valves of the injectors 15 to open and close, the high-pressure fuel in the common rail 16 is injected from the injectors 15 into the cylinders of the diesel engine 1.

  As shown in FIGS. 1 and 4, a cooling water pump 21 for circulating the cooling water is disposed coaxially with the fan shaft of the cooling fan 9 at a portion on the right side of the rear surface of the cylinder block 4. The rotation of the crankshaft 3 drives the cooling water pump 21 together with the cooling fan 9 via the cooling fan driving V-belt 22. The cooling water in the radiator 24 mounted on the work vehicle is supplied to the cooling water pump 21 by driving the cooling water pump 21. Then, cooling water is supplied to the cylinder block 4 and the cylinder head 5 to cool the diesel engine 1. An alternator 23 is provided on the right side of the cooling water pump 21.

  As shown in FIGS. 1 and 2, engine leg mounting portions 19 are provided on the left and right side surfaces of the cylinder block 4, respectively. Each engine leg mounting portion 19 is bolted to an engine leg (not shown) having vibration-proof rubber and connected to the left and right side walls of the machine body frame 94. The diesel engine 1 is supported in an anti-vibration manner on a body frame 94 of a traveling machine body in a work vehicle via each engine leg (not shown). Thereby, it can suppress that the vibration of the diesel engine 1 is transmitted to the body frame 94.

  Furthermore, the EGR device 26 (exhaust gas recirculation device) will be described with reference to FIGS. An air cleaner 32 (see FIG. 7) is connected to an inlet portion of the intake manifold 6 protruding upward via an EGR device 26 (exhaust gas recirculation device). Fresh air (external air) is sent from the air cleaner 32 to the intake manifold 6 via the EGR device 26. The EGR device 26 is an EGR body case 27 (collector) that mixes a part of exhaust gas of the diesel engine (EGR gas from the exhaust manifold) and fresh air (external air from the air cleaner 32) and supplies the mixture to the intake manifold 6. An intake throttle member 28 that causes the EGR main body case 27 to communicate with the air cleaner 32 via the intake pipe 33, a recirculation exhaust gas pipe 30 that serves as a reflux line connected to the exhaust manifold 7 via the EGR cooler 29, An EGR valve member 31 that communicates the EGR main body case 27 with the recirculation exhaust gas pipe 30 is provided.

  That is, the intake manifold 6 and the intake air intake throttle member 28 for introducing fresh air are connected via the EGR main body case 27. The EGR main body case 27 communicates with the outlet side of the recirculated exhaust gas pipe 30 extending from the exhaust manifold 7. The EGR main body case 27 is formed in a long cylindrical shape. The intake throttle member 28 is bolted to one end of the EGR main body case 27 in the longitudinal direction. A downward opening end portion of the EGR main body case 27 is detachably bolted to an inlet portion of the intake manifold 6.

  Further, the outlet side of the recirculation exhaust gas pipe 30 is connected to the EGR main body case 27 via the EGR valve member 31. The inlet side of the recirculated exhaust gas pipe 30 is connected to the lower surface side of the exhaust manifold 7 via the EGR cooler 29. The recirculated exhaust gas pipe 30 is piped so as to bypass the front surface of the cylinder head 5 above the flywheel housing 10. Further, the amount of EGR gas supplied to the EGR main body case 27 is adjusted by adjusting the opening of an EGR valve (not shown) in the EGR valve member 31.

  With the above configuration, fresh air (external air) is supplied from the air cleaner 32 to the EGR main body case 27 via the intake throttle member 28, while EGR is supplied from the exhaust manifold 7 to the EGR main body case 27 via the EGR valve member 31. Gas (a part of the exhaust gas discharged from the exhaust manifold) is supplied. After fresh air from the air cleaner 32 and EGR gas from the exhaust manifold 7 are mixed in the EGR main body case 27, the mixed gas in the EGR main body case 27 is supplied to the intake manifold 6. That is, a part of the exhaust gas discharged from the diesel engine 1 to the exhaust manifold 7 is recirculated from the intake manifold 6 to the diesel engine 1, so that the maximum combustion temperature at the time of high load operation is lowered. NOx (nitrogen oxide) emissions are reduced.

  When the EGR cooler 29 is arranged as described above, the EGR gas take-out pipe 61 is integrally formed in the exhaust manifold 7. Further, the pipe joint member 62 is bolted to the exhaust manifold 7. By supporting the EGR gas inlet portion of the EGR cooler 29 with the EGR gas take-out pipe 61 and supporting the EGR gas outlet portion of the EGR cooler 29 with the pipe joint member 62 connecting the recirculation exhaust gas pipe 30, The EGR cooler 29 is disposed away from the cylinder block 4 (specifically, the left side surface).

  Further, the recirculation exhaust gas pipe 30 connected to the pipe joint member 62 is disposed below the purification inlet pipe 36 of the exhaust gas purification apparatus 2 as shown in FIGS. 1 to 3 and FIGS. 6 to 8. The pipe is piped toward the front surface of the cylinder head 5 so as to be submerged. That is, the recirculation exhaust gas pipe 30 and the purification inlet pipe 36 intersect so that the purification inlet pipe 36 is on the upper side of the flywheel housing 10. Accordingly, above the flywheel housing 10 in front of the cylinder head 5, the recirculation exhaust gas pipe 30 extends from the right side surface of the cylinder head 5 toward the left side surface, while the purification inlet pipe 36 has the recirculation exhaust gas pipe. It extends in the front-rear direction so as to straddle 30 pieces of information.

  Thus, as shown in FIGS. 1 and 9, the EGR cooler 29 for cooling the EGR gas is disposed on the right side surface of the cylinder block 4 below the exhaust manifold 7. Therefore, the exhaust manifold 7 and the EGR cooler 29 can be installed compactly along one side of the engine 1. A cooling water piping path for connecting the cooling water pump 21 to the EGR cooler 29 and the exhaust throttle device 65 is provided on the right side of the diesel engine 1 (exhaust manifold 7 side). Thereby, the cooling water from the cooling water pump 21 is not only supplied to the water cooling part of the diesel engine 1 but also a part thereof is sent to the EGR cooler 29 and the exhaust throttle device 65.

  As shown in FIGS. 1, 3 to 5, and 7 to 10, an exhaust throttle device 65 that increases the exhaust pressure of the diesel engine 1 is provided on the right side of the cylinder head 5. An exhaust outlet of the exhaust manifold 7 is opened upward. An exhaust outlet of the exhaust manifold 7 is detachably connected to an elbow-shaped relay pipe 66 via an exhaust throttle device 65 for adjusting the exhaust pressure of the diesel engine 1. The exhaust throttle device 65 includes a throttle valve case 68 having a built-in exhaust throttle valve, an actuator case 69 having a power transmission mechanism from a motor (actuator) that controls the opening of the exhaust throttle valve, and an actuator case in the throttle valve case 68. A water cooling case 70 for connecting 69 is provided. By the power transmission mechanism, the motor is configured such that the rotation shaft of the motor can be interlocked with the rotation shaft of the exhaust throttle valve in the throttle valve case 68 by a gear or the like.

  A throttle valve case 68 is mounted on the exhaust outlet of the exhaust manifold 7, a relay pipe 66 is mounted on the throttle valve case 68, and the relay pipe is connected to the exhaust outlet body of the exhaust manifold 7 via the throttle valve case 68 with four bolts. 66 is fastened. The lower surface side of the throttle valve case 68 is fixed to the exhaust outlet body of the exhaust manifold 7. The lower surface side opening of the relay pipe 66 is fixed to the upper surface side of the throttle valve case 68. The lateral opening of the relay pipe 66 is connected to the purification inlet pipe 36 of the exhaust gas purification device 2.

  Accordingly, the exhaust manifold 7 is connected to the above-described exhaust gas purification device 2 via the relay pipe 66 and the exhaust throttle device 65. The exhaust gas that has moved from the outlet portion of the exhaust manifold 7 into the exhaust gas purification device 2 via the throttle valve case 68 and the relay pipe 66 is purified by the exhaust gas purification device 2 and then the tail from the purification outlet pipe 37. It moves to the pipe 135 and is finally discharged out of the machine.

Further, the relay pipe 66 includes a connection support portion 66 a that is connected to the exhaust manifold 7 at a position between the exhaust throttle device 65 and the purification inlet pipe 36 of the exhaust gas purification device 2. The connection support portion 66 a is configured by a wing-like plate that protrudes from the outer peripheral surface of the relay pipe 66 toward the exhaust manifold 7, and is fastened on the right side surface of the exhaust manifold 7. The relay pipe 66 connects the exhaust inlet to the exhaust outlet of the exhaust manifold 7 via the exhaust throttle device 65, and connects the pipe portion where the exhaust gas flows toward the purification inlet pipe 36 to the side surface of the exhaust manifold 7, Supported by an exhaust manifold 7. Therefore, the relay pipe 66 is supported by the highly rigid exhaust manifold 7, and the support structure with the exhaust gas purification device 2 via the relay pipe 66 can be configured with high rigidity.

  With the above configuration, the regeneration control of the soot filter 40 is executed by operating the motor of the exhaust throttle device 65 based on the pressure difference detected by the differential pressure sensor 44 in the exhaust gas purification device 2. That is, when soot accumulates on the soot filter 40, it is discharged from the diesel engine 1 by increasing the exhaust pressure of the diesel engine 1 by controlling the exhaust throttle valve of the exhaust throttle device 65 to close. The exhaust gas temperature is increased to a high temperature, and the soot accumulated on the soot filter 40 is combusted. As a result, the soot disappears and the soot filter 40 is regenerated.

  Further, even if the work with a small load and the temperature of the exhaust gas that tends to decrease (work that easily accumulates soot) is continuously performed, the exhaust throttle device 65 is caused to act as an exhaust temperature raising mechanism by forcibly increasing the exhaust pressure. The soot filter 40 can be regenerated, and the exhaust gas purification capacity of the exhaust gas purification device 2 can be maintained appropriately. Further, a burner or the like for burning the soot deposited on the soot filter 40 becomes unnecessary. In addition, when the engine 1 is started, the exhaust pressure of the diesel engine 1 is increased by controlling the exhaust throttle device 65, thereby increasing the temperature of the exhaust gas from the diesel engine 1 and promoting the warm-up of the diesel engine 1. it can.

  As described above, the exhaust throttle device 65 fastens the exhaust gas intake side of the throttle valve case 68 to the exhaust outlet of the exhaust manifold 7 opened upward, so that the relay pipe 66 passes through the throttle valve case 68. To the exhaust manifold 7. Therefore, the exhaust throttle device 65 can be supported by the highly rigid exhaust manifold 7 and the support structure of the exhaust throttle device 65 can be configured with high rigidity. For example, the throttle valve case 68 is connected to the exhaust manifold 7 via the relay pipe 66. As compared with the structure in which the exhaust gas is connected, the volume of the exhaust gas intake side of the exhaust throttle device 65 can be reduced and the exhaust pressure in the exhaust manifold 7 can be adjusted with high accuracy. For example, the temperature of the exhaust gas supplied to the exhaust gas purification device 2 can be easily maintained at a temperature suitable for exhaust gas purification.

A throttle valve case 68 is fastened to the upper surface side of the exhaust manifold 7, an elbow-shaped relay pipe 66 is fastened to the upper surface side of the throttle valve case 68, and the throttle valve case 68 and the relay pipe 66 are connected to the exhaust manifold 7. It is arranged in multiple layers . Therefore, without changing the support posture of the exhaust throttle device 65 and without changing the specifications of the relay pipe 66, for example, the mounting posture (connection direction) of the relay pipe 66 according to the mounting position of the exhaust gas purification device 2 or the like. Can be changed.

  Further, the exhaust outlet of the exhaust manifold 7 is opened upward, the throttle valve case 68 is provided on the upper surface side of the exhaust manifold 7, the throttle valve gas outlet is formed on the upper surface side of the throttle valve case 68, and the throttle valve case 68 An EGR cooler 29 for cooling the EGR gas is arranged below the exhaust manifold 7. Therefore, the exhaust manifold 7, the exhaust throttle device 65, and the EGR cooler 29 can be installed compactly along one side of the engine 1.

  Thus, in the diesel engine 1, the relay pipe 66 is fastened to the upper surface side of the exhaust throttle device 65, and the exhaust throttle device 65 and the relay pipe 66 are arranged in a multilayered manner with respect to the exhaust manifold 7, so An exhaust gas inlet of the exhaust throttle device 65 is connected to the pipe 66. Therefore, the exhaust throttle device 65 can be compactly disposed between the exhaust manifold 7 and the exhaust gas purification device 2, and the exhaust throttle device 65 can be compactly assembled in a limited engine installation space. Further, the exhaust gas purification device 2 can be easily disposed at a predetermined position by simply changing the shape of the relay pipe 66.

  The cooling water piping path provided on the right side of the diesel engine 1 (exhaust manifold 7 side) will be described. A cooling water outlet pipe 76 of the water cooling case 70 is connected to the other end of a cooling water return hose (cooling water pump suction side pipe) 75 having one end connected to the cooling water pump 21. The cooling water drain port of the EGR cooler 29 is connected to the other end of a relay hose (EGR cooler discharge side pipe) 78 having one end connected to the cooling water inlet pipe 77 of the water cooling case 70. A cooling water intake port of the EGR cooler 29 is connected to the cylinder block 4 via a cooling water extraction hose (EGR cooler suction side piping) 79.

  That is, the EGR cooler 29 and the exhaust throttle device 65 are connected to the cooling water pump 21 in series. An exhaust throttle device 65 is disposed between the cooling water pump 21 and the EGR cooler 29 in the cooling water flow path formed by the hoses 75, 78, 79 and the like. An exhaust throttle device 65 is located downstream of the EGR cooler 29. A part of the cooling water from the cooling water pump 21 is supplied from the cylinder block 4 to the exhaust throttle device 65 via the EGR cooler 29 and circulates.

  Further, the water cooling case 70 projects the cooling water outlet pipe 76 and the cooling water inlet pipe 77 from the back side (fan 9 side) toward the cooling water pump 21. That is, the water cooling case 70 is disposed behind the throttle valve case 68 (on the fan 9 side) so that the tips of the cooling water outlet pipe 76 and the cooling water inlet pipe 77 face the cooling water pump 21. Thereby, the cooling water outlet pipe 76 of the water cooling case 70 can be disposed close to the cooling water pump 21, and the return hose 75 can be formed short. The cooling water outlet pipe 76 is disposed above the cooling water inlet pipe 77 (exhaust throttle outlet side).

  As described above, the oil cooler 18 is disposed on the intake manifold 6 side and the EGR cooler 29 described later is disposed on the exhaust manifold 7 side with the crankshaft 3 interposed therebetween. That is, in plan view, the oil cooler 18 is disposed on the intake manifold 6 side with the crankshaft 3 of the diesel engine 1 interposed therebetween, and the EGR cooler 29 is disposed on the exhaust manifold 7 side. The cooling water distribution system and the cooling water distribution system for the oil cooler 18 are distributed to the left and right sides with the crankshaft 3 interposed therebetween. For this reason, arrangement | positioning of each cooling water distribution system is easy to understand, and assembly workability | operativity and maintainability can be improved.

  The exhaust throttle device 65 is arranged on the right side of the head cover 8 so that the rotation axis direction of the exhaust throttle valve in the throttle valve case 68 (the rotation axis direction of the motor in the actuator case 69) 65a is parallel to the right side surface of the head cover 8. It is arranged away from the surface. That is, in the exhaust throttle device 65, the left end surface of the water cooling case 70 that is closest to the right side surface of the head cover 8 is parallel to the right side surface of the head cover 8 while being separated. Therefore, a gap 8 a is formed between the right side surface of the head cover 8 and the inner side surface (left side surface) of the exhaust throttle device 65. In the exhaust throttle device 65, the right end surface of the water cooling case 70 is positioned farthest from the right side surface of the head cover 8.

  The exhaust throttle device 65 has an outer side surface (right side surface) facing the body frame 94 formed flush with one side surface (right side surface) of the exhaust gas purification device 2 also facing the body frame 94. That is, the exhaust inlet side end surface (right side surface) of the exhaust gas purification device 2 and the outer side surface (right side surface) of the exhaust throttle device 65 are flush with each other inside the fuselage frame 94. Thereby, while the engine room structure surrounding the diesel engine 1 can be easily configured by the body frame 94, the assembling workability of the diesel engine 1 in which the exhaust gas purification device 2 is arranged can be easily improved.

  Further, the outer side surface (right side surface) of the alternator 23 is also flush with the one side surface (right side surface) of the exhaust gas purification device 2 formed flush with the outer side surface (right side surface) of the exhaust throttle device 65. Is formed. In other words, the outer side surface (right side surface) of the alternator 23 facing the body frame 94 is formed flush with one side surface (right side surface) of the exhaust gas purifying device 2 also facing the body frame 94. As a result, the one side surface of the exhaust gas purifying device 2, the outer surface of the exhaust throttle device 65, and the outer surface of the alternator 23 can be compactly arranged close to each other so as to face the flat vertical wall surface of the fuselage frame 94. The diesel engine 1 can be compactly assembled in the room space.

  The exhaust throttle device 65 is disposed at a position offset to the outside (right side) with respect to the purification inlet pipe 36 of the exhaust gas purification device 2 in plan view (top view). That is, the throttle valve case 68 is disposed so as to be offset to a position near the body frame 94 with respect to the purification inlet pipe 36 of the exhaust gas purification device 2. Accordingly, the relay pipe 66 is S-shaped with the exhaust inlet side (exhaust throttle device 65 side) outside (right side) the exhaust outlet side (exhaust gas purification device 2 side) in plan view (top view). Have

  In the exhaust throttle device 65, the actuator case 69 is arranged on the right side with respect to the throttle valve case 68, and the cooling water outlet pipe 76 and the cooling water inlet pipe 77 are arranged vertically on the left side of the rear end of the water cooling case 70. That is, on the back side of the water cooling case 70 (fan 9 side), the cooling water return hose 75 and the cooling water relay hose 78 are sufficient to be piped between the left side surface of the actuator case 69 and the right side surface of the head cover 8. Space can be secured. Therefore, it is possible to easily prevent the cooling water return hose 75 and the cooling water relay hose 78 from coming into contact with the engine body due to mechanical vibration and being damaged.

  As shown in FIGS. 1, 3, 4, 7, 9, and 10, the exhaust manifold 7 has a configuration in which an exhaust pressure sensor pipe 85 is connected to a pressure outlet 83. That is, the pressure extraction port 83 provided on the upper surface of the exhaust manifold 7 is connected to one end of an exhaust pressure sensor pipe 85 extending along the right side surface of the head cover 8. In addition, an exhaust pressure sensor 84 is installed on the rear end side (cooling water pump 21 side) of the head cover 8, and the exhaust pressure sensor 84 is an exhaust pressure hose 86 (connecting component) configured by a flexible rubber hose or the like. ) Is connected to the other end of the exhaust pressure sensor pipe 85.

  That is, the exhaust pressure sensor pipe 85 extends so as to pass through the gap 8 a between the head cover 8 and the exhaust throttle device 65. Therefore, the exhaust pressure sensor pipe 85 can be formed in a short length without bypassing other components in the connection path from the pressure outlet 83 of the exhaust manifold 7 to the exhaust pressure sensor 84. The vibration isolation structure can be simplified. The space 8 a also secures a space between the left end surface of the water cooling case 70 closest to the head cover 8 and the head cover 8. Therefore, the cooling water pipe (the cooling water return hose 75 and the cooling water relay hose 78 can be juxtaposed with the exhaust pressure sensor pipe 85 at an interval. Therefore, the cooling water pipe contacts the engine body by mechanical vibration. Damage can be easily prevented.

  The pressure extraction port 83 is disposed at a position between the cylinder head 5 and the relay pipe 66 on the upper surface of the exhaust manifold 7. As shown in FIG. 3, a gas temperature sensor 82 for measuring the exhaust gas temperature in the exhaust manifold 7 is attached to the upper surface of the exhaust manifold 7 on the outer side (the relay pipe 66 side) than the pressure outlet 83. ing. The electrical wiring 87 of the gas temperature sensor 82 passes through the upper part of the front end (flywheel 9 side) of the head cover 8 and is connected to the connector on the left side as shown in FIGS. 2, 3, and 6 to 8. ing.

  As shown in FIGS. 6 and 7, the radiator 24 is disposed behind the diesel engine 1 at a position facing the cooling fan 9 via a fan shroud (not shown). An oil cooler 25 is disposed on the front surface of the radiator 24 so as to face the cooling fan 9. In this manner, the radiator 24 and the oil cooler 25 are arranged in a row in the position facing the cooling fan 9 at the rear of the diesel engine 1 in the order of decreasing heat radiation in the direction of discharging the cooling air. Accordingly, when the cooling fan 9 is driven to rotate and the outside air is sucked from the rear of the diesel engine 1, the radiator 24 and the oil cooler 25, which are heat exchangers, are each blown by outside air (cooling air) and are air-cooled. It will be.

  Next, the exhaust gas purification device 2 will be described with reference to FIGS. 1 to 3, FIGS. 5 to 9, and FIGS. 11 to 14. The exhaust gas purification device 2 includes an exhaust gas purification case 38 having a purification inlet pipe 36 and a purification outlet pipe 37. The exhaust gas purification case 38 is configured in a cylindrical shape that extends long in the left-right direction. A purification inlet pipe 36 and a purification outlet pipe 37 are respectively provided on the right side (upstream side in the exhaust gas movement direction) and the left side (downstream side in the exhaust gas movement direction) of the exhaust gas purification case 38.

  Further, the exhaust gas purification device 2 is fixed on the flywheel housing 10 and disposed in front of the cylinder head 5 and the head cover 8. At this time, the purification inlet pipe 36 is provided on the right rear side of the cylindrical side surface of the exhaust gas purification case 38. And the purification | cleaning inlet pipe 36 is made into the shape bent diagonally upward toward back so that the recirculation exhaust gas pipe 30 might be straddled, and it bolts to the relay pipe 66 so that attachment or detachment is possible. On the other hand, the purification outlet pipe 37 is provided on the lower left side of the cylindrical side surface of the exhaust gas purification case 38 and is connected to the tail pipe 135.

  Inside the exhaust gas purification case 38, a diesel oxidation catalyst 39 (gas purification body) such as platinum that generates nitrogen dioxide (NO2) and the collected particulate matter (PM) are continuously oxidized and removed at a relatively low temperature. The soot filter 40 (gas purifier) having a honeycomb structure is arranged in series along the moving direction of the exhaust gas. Note that one side of the exhaust gas purification case 38 is formed by a silencer 41, and the silencer 41 is provided with a purification outlet pipe 37 connected to the tail pipe 135.

  With the above configuration, nitrogen dioxide (NO 2) generated by the oxidation action of the diesel oxidation catalyst 39 is supplied into the soot filter 40 from one end face (intake end face). Particulate matter (PM) contained in the exhaust gas of the diesel engine 1 is collected by the soot filter 40 and continuously oxidized and removed by nitrogen dioxide (NO2). In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 1, the content of carbon monoxide (CO) and hydrocarbon (HC) in the exhaust gas of the diesel engine 1 is reduced.

  Further, a thermistor-type upstream gas temperature sensor 42 and a downstream gas temperature sensor 43 are attached to the exhaust gas purification case 38. The exhaust gas temperature at the gas inflow side end face of the diesel oxidation catalyst 39 is detected by the upstream gas temperature sensor 42. The exhaust gas temperature at the gas outflow side end face of the diesel oxidation catalyst is detected by the downstream gas temperature sensor 43.

  Further, a differential pressure sensor 44 as an exhaust gas pressure sensor is attached to the exhaust gas purification case 38. A pressure difference of the exhaust gas between the upstream side and the downstream side of the soot filter 40 is detected by a differential pressure sensor 44. Based on the exhaust pressure difference between the upstream side and the downstream side of the soot filter 40, the accumulation amount of particulate matter in the soot filter 40 is calculated, and the clogged state in the soot filter 40 can be grasped.

  The differential pressure sensor 44 integrally provided with the electrical wiring connector 51 is supported by a substantially L-shaped sensor bracket (sensor support body) 46 together with the electrical wiring connector 55 of the gas temperature sensors 42 and 43. The sensor bracket 46 is detachably attached to a sensor support portion 56 formed on one arcuate body of the outlet holding flange 45. That is, the sensor support portion 56 is formed on a part of the muffler-side outlet pinching flange 45 farthest from the purification inlet pipe 36 side. The sensor bracket 46 is detachably attached to the mute-side outlet pinching flange 45 by bolting the vertical plate portion of the sensor bracket 46 to the sensor support portion 56 of the arcuate body. The sensor bracket 46 is not limited to the outlet clamping flange 45 but may be fastened to another clamping flange such as a central clamping flange that is fastened when the exhaust gas purification case 38 is assembled.

  One end side of the upstream sensor pipe 47 and the downstream sensor pipe 48 is connected to the differential pressure sensor 44. The upstream and downstream sensor piping boss bodies 49 and 50 are arranged in the exhaust gas purification case 38 so as to sandwich the soot filter 40 in the exhaust gas purification case 38. The other end sides of the upstream sensor pipe 47 and the downstream sensor pipe 48 are connected to the sensor pipe boss bodies 49 and 50, respectively.

  With the above configuration, a difference between the exhaust gas pressure on the inflow side of the soot filter 40 and the exhaust gas pressure on the outflow side of the soot filter 40 (exhaust gas differential pressure) is detected via the differential pressure sensor 44. Since the residual amount of particulate matter in the exhaust gas collected by the soot filter 40 is proportional to the differential pressure of the exhaust gas, the difference occurs when the amount of particulate matter remaining in the soot filter 40 increases more than a predetermined amount. Based on the detection result of the pressure sensor 44, regeneration control (for example, control for increasing the exhaust temperature) for reducing the amount of particulate matter in the soot filter 40 is executed. When the residual amount of the particulate matter further increases beyond the regeneration controllable range, the maintenance work for removing the particulate matter artificially by removing and disassembling the exhaust gas purification case 38, cleaning the soot filter 40, and so on. Is done.

  Next, the mounting structure of the exhaust gas purification device 2 will be described. In the exhaust gas purification case 38 in the exhaust gas purification device 2, a connecting leg (left bracket) 80 is detachably attached to the downstream outlet pinching flange 45 by bolt fastening, and a fixed leg (right bracket) 81 is welded. It is fixed. At this time, the attachment boss part of the connecting leg 80 is bolted and attached to the leg fastening part with a through hole provided in the arcuate body of the outlet holding flange 45. The fixed leg 81 is fixed to the outer peripheral surface of the exhaust gas purification case 38 by welding on the purification inlet pipe 36 side. That is, the fixed leg 81 is installed on the inlet side (upstream side) of the exhaust gas purification case 38, and the connecting leg body 80 is installed on the outlet side (downstream side) of the exhaust gas purification case 38. The connecting leg 80 is not limited to the outlet clamping flange 45 but may be fastened to another clamping flange such as a central clamping flange that is fastened when the exhaust gas purification case 38 is assembled.

  Each of the connecting leg 80 and the fixed leg 81 provided on the outer periphery of the exhaust gas purification case 38 is bolted to a purification device attachment portion (DPF attachment portion) 89 formed on the upper surface side of the flywheel housing 10. . That is, the exhaust gas purification device 2 is stably connected and supported on the flywheel housing 10, which is a highly rigid member, by the connecting legs 80 and the fixed legs 81. Therefore, although the exhaust gas purification device 2 is included in the vibration system of the engine 1, the exhaust gas purification device 2 can be firmly connected to the flywheel housing 10 which is a high-rigidity component as one of the components of the engine 1. It is possible to prevent the exhaust gas purification device 2 from being damaged due to the vibration. The exhaust gas purifying device 2 can be incorporated into the engine 1 and shipped at the production site of the engine 1. Further, since the exhaust gas purification device 2 can communicate with the exhaust manifold 7 of the engine 1 at a close distance, the exhaust gas purification device 2 can be easily maintained at an appropriate temperature, and high exhaust gas purification performance can be maintained.

  As described above, the exhaust gas purification device (DPF) 2 is connected to a DPF casing (exhaust gas purification case) 38 made of a heat-resistant metal material via a cylindrical inner case (not shown), for example, diesel oxidation such as platinum. In this structure, the catalyst 39 and the soot filter 40 having a honeycomb structure are accommodated in series. The exhaust gas purification device 2 is attached to the flywheel housing 10 via a flange side bracket leg (connecting leg) 80 and a casing side bracket leg (fixed leg) 81 as a support. In this case, one end side of the flange side bracket leg 80 is detachably bolted to the outer peripheral side of the DPF casing 38 via the flange 45. One end of the casing side bracket leg 81 is integrally welded to the outer peripheral surface of the DPF casing 38.

  On the other hand, the other end side of the flange side bracket leg 80 is detachably fastened to the upper surface (DPF attachment portion) of the flywheel housing 10 with a front bolt 90 and a rear bolt 91. That is, the bolt through holes 90 a and 91 a are opened in the flange side bracket leg 80. Screw holes 90b and 91b are opened upward in the DPF attachment portion 89. The casing side bracket leg 81 is placed on the flat upper surface of the DPF mounting portion 89, the front bolt 91 and the rear bolt 91 are fastened to the screw holes 90b and 91b via the bolt through holes 90a and 91a, and the flange is formed on the upper surface of the flywheel housing 78. The exhaust gas purification device 2 is configured to be detachably fixed via the side bracket leg 80.

  Further, the other end side of the casing side bracket leg 81 is detachably fastened to the DPF attachment portion 89 on the upper surface of the flywheel housing 10 by two retrofitting bolts 91. That is, the bolt through hole 91 a is opened in the casing side bracket leg 81. A screw hole 91b is opened upward in the DPF attachment portion 89. The casing side bracket leg 81 is placed on the flat upper surface of the DPF mounting portion 89, the retrofitting bolt 91 is fastened to the screw hole 91b via the bolt through hole 91a, and the flywheel housing 10 is connected to the upper surface of the DPF attachment portion 89 via the casing side bracket leg 81. The exhaust gas purification device 2 is configured to be detachably fixed.

  Further, a notch groove 92 for engaging the front bolt 90 in the bolt through hole 90a is formed on the other end side of the flange side bracket leg 80. When the exhaust gas purification device 2 is assembled to the diesel engine 1, the notch groove 92 is opened at the front edge of the flange side bracket leg 80 so that the opening of the notch groove 92 is positioned at the head. In addition, the open edge part of the notch groove 92 is formed in the taper of the divergent form (protruding form).

  With the above configuration, when the exhaust gas purification device 2 is assembled to the diesel engine 1, first, the leading bolt 90 is incompletely screwed into the DPF mounting portion 89 on the top surface of the flywheel housing 10 through the screw hole 90b. The leading bolt 90 is supported by the DPF mounting portion 89 in a state where the head of the leading bolt 90 is separated from the upper surface of the DPF mounting portion 89 by the thickness of the flange side bracket leg 80 or more. Then, the operator lifts the exhaust gas purification device 2 with both hands, and engages the screw hole 90b of the flange side bracket leg 80 with the head of the tip bolt 90 via the notch groove 92, so that the flywheel housing 10 has an upper surface. The exhaust gas purification device 2 is temporarily fixed. In this state, the operator can release both hands from the exhaust gas purification device 2.

  Thereafter, the flange side bracket leg 80 and the casing side bracket leg 81 are fastened to the DPF attachment portion 89 on the upper surface of the flywheel housing 10 by three retrofitting bolts 91. On the other hand, the inlet flange body 36a is fastened to the relay pipe 66 via the embedded bolt 36x and the inlet flange nut 36y, and the exhaust gas inlet pipe (purification inlet pipe) 36 is fixed to the relay pipe 66.

  Next, the leading bolt 90 is completely fastened to the DPF mounting portion 89 on the upper surface of the flywheel housing 10, and the exhaust gas purification device 2 is detachably fixed to the exhaust gas outlet side of the relay pipe 66 and the upper surface of the flywheel housing 10. Then, the operation of assembling the exhaust gas purification device 2 to the diesel engine 1 is completed. Since the bolt through hole 90a for inserting the bolt is opened on the front side edge of the flange side bracket leg 80 through the notch groove 92 on the front surface side in the attaching / detaching direction of the DPF casing 38, the leading bolt 90 is incompletely fastened. With the DPF casing 38 lifted with both hands in a state of being temporarily fixed in a (semi-fixed) position, the tip bolt 90 is moved by moving the DPF casing 38 to the attachment site of the diesel engine 1 (or this machine), that is, the upper surface of the flywheel housing 10. The bolt through hole 90a can be engaged through the notch groove 92.

  When the diesel engine 1 to which the exhaust purification device 2 is attached is viewed from the upper surface, the attachment position of the front bolt 90 in the DPF attachment portion 89 overlaps the piping position of the recirculation exhaust gas pipe 61. On the other hand, the mounting position of the retrofit bolt 91 in the DPF mounting portion 89 does not overlap with the piping position of the recirculated exhaust gas pipe 61. That is, the screw hole 90b in the DPF attachment portion 89 is disposed below the recirculation exhaust gas pipe 61 that is piped forward of the cylinder head 5, but the screw hole 91b is formed in the recirculation exhaust gas pipe 61 in plan view. It is arranged at a position deviating from the piping position.

  Therefore, when the operator temporarily fixes the leading bolt 90 to the DPF attachment portion 89, the worker is screwed to the leading bolt 90 in the screw hole 90b located on the lower side of the recirculation exhaust gas pipe 61, but the exhaust purification device 2 Therefore, it can be easily attached from the front side of the diesel engine 1 (front of the flywheel housing 10). Then, after temporarily fixing the leading bolt 90, the cylinder head 5 is moved from the front side of the diesel engine 1 (front of the flywheel housing 10) by causing the lower surfaces of the leg bodies (bracket legs) 80 and 81 to be along the upper surface of the DPF mounting portion 89. The exhaust purification device 2 is slid toward the front. That is, the exhaust purification device 2 is slid so that the leading bolt 90 passes through the notch groove 92, and the legs (bracket legs) 80 and 81 are installed on the DPF attachment portion 89.

  As a result, the exhaust purification device 2 is placed on the DPF attachment portion 89 in a state where the bolt through hole 90a of the flange side bracket leg 80 is locked to the tip bolt 90. At this time, the bolt through holes 91a of the legs (bracket legs) 80 and 81 are located above the screw holes 91b of the DPF attachment portion 89. Then, the operator can confirm the positions of the bolt through holes 91 a and the screw holes 91 b that are in communication with each other from the upper side of the diesel engine 1 at positions around the recirculation exhaust gas pipe 61. That is, since the bolt through hole 91a and the screw hole 91b are positioned so as not to overlap the recirculated exhaust gas pipe 61 in plan view, the retrofitted bolt 91 can be inserted and fastened from directly above the bolt through hole 91a and the screw hole 91b. .

  When assembled as described above, the operator can fasten the flange-side bracket leg 80 and the casing-side bracket leg 81 by tightening the rear bolt 91 (bolt) in a state where the hand is released from the DPF casing 38. In addition, the exhaust gas purification apparatus 2 can be removed by a procedure reverse to the above. As a result, the exhaust gas purifying device 2 (DPF casing 38) is stabilized at the front of the diesel engine 1 at the upper part of the flywheel housing 10 which is a highly rigid member by the bracket legs 80 and 81 and the relay pipe 66. Well connected and supported. Moreover, the attachment / detachment operation | work of the exhaust gas purification apparatus 2 to the diesel engine 1 can be performed by one worker.

  As described above, the diesel engine 1 includes the exhaust gas processing case 2 for processing the exhaust gas, and the exhaust gas processing device 2 is disposed on the upper surface side of the diesel engine 1. In addition, a temporary fixing latch 90 is provided on one side of the diesel engine 1 or the exhaust gas treatment device 2, and a temporary fixing latch notch 92 is provided on the other, and temporarily fixed to the lower side of the attached parts of the diesel engine 1. The locking body 87 or the temporary fixing locking notch 92 is disposed. Therefore, the retrofit bolt 91 of the exhaust gas treatment device 2 can be fastened at a position away from the attached parts, and the detachability of the exhaust gas treatment device 2 can be improved.

  The diesel engine 1 has a structure in which an exhaust gas treatment device 2 is mounted on a flywheel housing 10, and a recirculation exhaust gas pipe 61 as an attached part is extended between the diesel engine 1 and the exhaust gas treatment device 2. ing. Therefore, the recirculation exhaust gas pipe 61 can be detoured on the side surface (front side surface) of the diesel engine 1 so that the mounting height can be made compact. And the exhaust-gas processing apparatus 2 is temporarily fixedly supported on the upper surface side of the flywheel housing 10 via the temporary fixing latching body 90, and fastening workability | operativity can be improved.

  In the diesel engine 1, an exhaust outlet pipe (relay pipe) 66 is fixed to the exhaust manifold 7 via an exhaust throttle valve case (throttle valve case) 68, and the exhaust outlet pipe 66 is connected to the inlet pipe 36 of the exhaust gas treatment device 2. Are connected. Accordingly, the mounting position of the exhaust gas processing device 2 can be easily changed by simply changing the specifications of the exhaust outlet pipe 66, and the exhaust gas processing device 2 can be mounted easily corresponding to the engine room space of various work vehicles. The installed diesel engine 1 can be mounted.

  Hereinafter, with reference to FIGS. 15-18, the work vehicle carrying the said diesel engine 1 is demonstrated based on drawing. 15 to 18 are explanatory views of a wheel loader as a work vehicle.

  A wheel loader 211 shown in FIGS. 15 to 18 includes a traveling machine body 216 having a pair of left and right front wheels 213 and a rear wheel 214. The traveling body 216 is equipped with a control unit 217 and the engine 1. A loader device 212 as a working unit is attached to the front side portion of the traveling machine body 216 so that the loader work can be performed. The control unit 217 is provided with a control seat 219 on which an operator is seated, a control handle 218, operation means for operating the engine 1 and the like, a lever or switch as an operation means for the loader device 212, and the like.

  As described above, the loader device 212 serving as a working unit is provided at the front portion of the wheel loader 211 and above the front wheel 213. The loader device 212 includes loader posts 222 disposed on the left and right sides of the traveling machine body 216, a pair of left and right lift arms 223 connected to the upper ends of the loader posts 222 so as to swing up and down, and tip portions of the left and right lift arms 223. And a bucket 224 connected to be vertically swingable.

  Between each loader post 222 and the corresponding lift arm 223, a lift cylinder 226 for vertically swinging the lift arm 223 is provided. A bucket cylinder 228 for swinging the bucket 224 up and down is provided between the left and right lift arms 223 and the bucket 224. In this case, when the operator of the control seat 219 operates a loader lever (not shown), the lift cylinder 226 and the bucket cylinder 228 are expanded and contracted to swing the lift arm 223 and the bucket 224 up and down to execute the loader operation. It is configured as follows.

  In the wheel loader 211, the engine 1 is arranged so that the flywheel housing 10 is positioned on the front side of the traveling machine body 216 below the control seat 219. That is, the engine 1 is arranged so that the direction of the engine output shaft is along the front-rear direction in which the loader device 212 and the counterweight 215 are aligned. And in the back of this engine 1, the oil cooler 25 and the radiator 24 are arrange | positioned in order from the front at the front rear side of the cooling fan 9. FIG. Further, an exhaust gas purification device 2 fixed to the upper part of the flywheel housing 10 is disposed on the upper front side of the engine 1.

  The exhaust gas purification device 2 has a purification inlet pipe 36 directly connected to an exhaust outlet 71 of an exhaust manifold 7 installed on the right side of the engine 1. The exhaust gas purification device 2 is installed such that the movement direction of the exhaust gas is the same direction. That is, the exhaust gas that has flowed into the exhaust gas purification case 38 from the purification inlet pipe 36 flows from the right side to the left side in the purification case 38, and particulate matter (PM) is removed. Then, the purified exhaust gas is discharged outside the machine through the tail pipe 135 connected on the lower left side surface of the exhaust gas purification device 2.

  The engine 1 is connected to an air cleaner 32 that sucks fresh air (external air) on the left side. The air cleaner 32 is arranged at a position behind the left side of the engine 1 and away from the exhaust gas purification device 2 heated by exhaust heat based on the exhaust gas. That is, the air cleaner 32 is arranged on the left side of the radiator 24 behind the engine 1 and at a position not affected by the heat from the exhaust gas purification device 2. Therefore, it is possible to prevent the air cleaner 32 that is formed of a resin molded product and the like and is thermally weak from being affected by deformation due to exhaust heat based on the exhaust gas that passes through the exhaust gas purification device 2.

  As described above, the engine 1, the exhaust gas purification device 2, the radiator 24, and the air cleaner 32 disposed below and behind the control seat 219 are covered with the bonnet 220 disposed above the counterweight 215. The bonnet 220 is configured as a seat frame (front cover part) 221 protruding from the floor surface of the control unit 217, and a bonnet cover that can be opened and closed at a front part in the control part 217 and at a rear part of the control part 217. 229 (projecting cover part).

  That is, when the seat frame 221 covers the upper part of the front portion of the engine 1, the seat frame 221 also covers the exhaust gas purification device 2 disposed on the upper front side of the engine 1. On the other hand, the bonnet cover 229 covers the radiator 24 and the oil cooler 25 arranged behind the engine 1 by providing a shape that covers the rear of the engine 1 from the upper side toward the rear side.

  A control seat 219 is detachably installed on the upper side of the seat frame 221 of the bonnet 220. As a result, when the control seat 219 is removed from the seat frame 221, the upper surface of the seat frame 221 is opened, so that the engine 1 and the exhaust gas purification device 2 below the seat frame 221 can be maintained. In addition, it is not limited to the structure which makes the control seat 219 detachable, It is good also as what opens the upper surface of the seat frame 221 because the control seat 219 tilts to the front side above the seat frame 221. At this time, as in the example illustrated in FIG. 16, the upper side of the engine 1 or the like may be opened by tilting the seat frame 221 itself to which the control seat 219 is fixed to the front side.

  The bonnet 220 is provided with a seat frame 221 whose upper surface can be opened in front of the bonnet 220 so that when the upper surface of the seat frame 221 is closed, the seat frame 1 is disposed on the upper front side of the engine 1. Cover. Therefore, the temperature drop of the exhaust gas purification device 2 due to wind and rain can be suppressed, and the exhaust gas purification device 2 can be easily maintained at an appropriate temperature. In addition, the risk of the operator touching the exhaust gas purification device 2 can be reduced. On the other hand, when the upper surface of the seat frame 221 is opened, the upper front side of the engine 1 is opened, so that access to the exhaust gas purification device 2 disposed on the upper front side of the engine 1 is facilitated, and maintenance work is easy to perform.

  On the other hand, at the rear of the seat frame 211, the bonnet 220 includes a bonnet cover 229 that protrudes upward from the upper surface of the seat frame 221. The bonnet cover 229 is arranged above the counterweight 215 so as to cover the radiator 24 and the oil cooler 25 arranged behind the engine 1 and to be opened and closed. That is, as in the example shown in FIG. 17, the hinge part 230 disposed on the upper front side of the bonnet cover 229 is configured to pivotally support the bonnet cover 229 and rotate the bonnet cover 229 upward in the front side. Thus, the upper rear side of the engine 1 may be opened. At this time, the bonnet cover 229 may be connected to the traveling machine body 216 via a hydraulic damper or the like so as to be supported when the bonnet cover 229 is opened.

  In the engine 1, a transmission case 132 is connected to the front side of the flywheel housing 10. Power from the engine 1 via the flywheel 11 is appropriately shifted in the transmission case 132 and transmitted to the hydraulic drive source 133 such as the front wheel 213 and the rear wheel 214, the lift cylinder 226 and the bucket cylinder 228.

A structure in which the diesel engine 1 is mounted on the forklift car 120 will be described with reference to FIGS. 19 and 20. As shown in FIGS. 19 and 20, the forklift car 120 includes a traveling machine body 124 having a pair of left and right front wheels 122 and a rear wheel 123. The traveling machine body 124 is equipped with the control unit 125 and the engine 1. A working portion 127 having a fork 126 for cargo handling work is provided on the front side portion of the traveling machine body 124. The control unit 125 is provided with a control seat 128 on which an operator is seated, a control handle 129, operation means for performing output operation of the engine 1 and the like, a lever or switch as an operation means for the working unit 127, and the like.

  A fork 126 is arranged on the mast 130 that is a component of the working unit 127 so as to be movable up and down. The fork 126 is moved up and down, a pallet (not shown) loaded with a load is placed on the fork 126, the traveling machine body 124 is moved forward and backward, and a cargo handling operation such as transportation of the pallet is performed. Yes.

  In this forklift car 120, the engine 1 is disposed below the control seat (driver's seat) 128 and the flywheel housing 10 is disposed on the front side of the traveling aircraft body 124. An exhaust gas purification device 2 is disposed on the upper front side of the engine 1. That is, the exhaust gas purification device 2 is disposed above the flywheel housing 10 provided in front of the engine 1. Further, a radiator 24 and an oil cooler 25 are disposed at a position facing the cooling fan 9 behind the engine 1, and an air cleaner 32 connected to the left side of the engine 1 is disposed on the left side of the engine 1. Located on the left side.

  Thus, the engine 1, the exhaust gas purification device 2, the radiator 24, and the air cleaner 32 that are disposed below and behind the control seat 128 are covered with the hood 136 that is disposed above the counterweight 131. The hood 136 is configured such that the operator seat 128 is detachable and the front upper surface portion is opened so that the operator can access the engine 1 and the exhaust gas purification device 2 in the bonnet 136. The rear of the hood 136 is also configured to be openable and closable.

  As described above, the diesel engine 1 is arranged so that the direction of the crankshaft 3 is along the front-rear direction in which the working unit 127 and the counterweight 131 are arranged. A mission case 132 is connected to the front side of the flywheel housing 10. Power from the diesel engine 1 via the flywheel 11 is appropriately shifted in the transmission case 132 and transmitted to the front wheel 122, the rear wheel 123, and the hydraulic drive source 133 of the fork 126.

  In addition, this invention is not limited to the above-mentioned embodiment, It can be embodied in various aspects. For example, the engine device according to the present invention is not limited to the forklift car 120 and the wheel loader 211 as described above, and is widely applied to various working machines such as agricultural machines such as a combine and a tractor and special work vehicles such as a crane car. it can. Moreover, the structure of each part in this invention is not limited to embodiment of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Exhaust gas purification apparatus 7 Exhaust manifold 10 Flywheel housing 13 Oil filter 13a Oil pipe 13b Oil pipe 13c Oil pipe connection part 13d Filter part 18 Oil cooler 18a Cooling water pipe 18b Cooling water pipe 18c Cooling water pipe connection part 18d Oil piping connection 29 EGR cooler 30 Recirculation exhaust gas pipe 36 Purification inlet pipe 36a Inlet flange body 36x Embedded bolt 36y Inlet flange nut 65 Exhaust throttle device 66 Relay pipe 68 Throttle valve case 69 Actuator case 70 Water cooling case 75 Cooling water return Hose 76 Cooling water outlet pipe 77 Cooling water inlet pipe 78 Relay hose 79 Cooling water outlet hose 80 Connecting leg 81 Fixed leg 82 Gas temperature sensor 83 Pressure outlet 84 Exhaust pressure sensor 85 Exhaust pressure sensor pie 86 exhaust pressure hose

Claims (3)

  1. An exhaust gas purification device for processing exhaust gas from an exhaust manifold of the engine, an exhaust throttle device interposed between the exhaust gas purification device and the exhaust manifold, and a flywheel housing attached to a front side surface of the engine A cooling water pump attached to the rear of the engine, and the exhaust gas purification device is mounted in the left-right direction on the flywheel housing.
    The exhaust gas purification device includes a purification inlet pipe extending rearward from the outer peripheral surface;
    The exhaust throttle device is configured by connecting a throttle valve case and an actuator case behind the throttle valve case with a water cooling case,
    An exhaust inlet side of the throttle valve case is connected to an exhaust outlet of the exhaust manifold that opens upward, and a lower surface side opening of the relay pipe is connected to an exhaust outlet side of the throttle valve case, and the relay pipe that opens forward A lateral opening is connected to the purification inlet pipe,
    The actuator case is disposed on the left and right outside of the throttle valve case with respect to the engine, and a cooling water inlet pipe and a cooling water outlet pipe are provided as cooling water pipes projecting rearward from the back side of the water cooling case. Arranged between the engine and the actuator case ;
    The cooling water outlet pipe is connected to the cooling water pump, the cooling water inlet pipe is connected to an EGR cooler disposed below the exhaust manifold, and cooling water from the cooling water pump is supplied to the engine. An engine device configured to be supplied not only to the water cooling unit but also to be sent to the EGR cooler and the exhaust throttle device.
  2. 2. The engine device according to claim 1, wherein the cooling water pipe of the water cooling case is disposed between a left and right side surface of a head cover covering the upper surface of the engine and a left and right other side surface of the actuator case .
  3. In the plan view, the relay pipe has an S-shape in which an exhaust inlet side connected to the throttle valve case is left and right outer than an exhaust outlet side connected to the purification inlet pipe, and the exhaust throttle device and the purification The engine device according to claim 1, further comprising a connection support portion connected to the exhaust manifold at a position between the inlet pipe and the inlet pipe.
JP2013242243A 2013-11-22 2013-11-22 Engine equipment Active JP6233963B2 (en)

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JP2013242243A JP6233963B2 (en) 2013-11-22 2013-11-22 Engine equipment
PCT/JP2014/080783 WO2015076338A1 (en) 2013-11-22 2014-11-20 Engine device
CN201480063628.4A CN105745410A (en) 2013-11-22 2014-11-20 Control device for internal combustion engine
KR1020167011772A KR20160088299A (en) 2013-11-22 2014-11-20 Engine device
EP14863761.4A EP3098411A4 (en) 2013-11-22 2014-11-20 Engine device
US15/038,291 US20160290211A1 (en) 2013-11-22 2014-11-20 Engine device

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