JP2014238064A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device which makes cooling air of an engine 1 less likely to directly contact with an exhaust gas communication pipe 72 and inhibits the temperature drop of an exhaust gas in the exhaust gas communication pipe 72 and an exhaust emission control system 2.SOLUTION: An engine device includes: an engine 1 which drives a work part 212; and an exhaust emission control system 2 which processes an exhaust gas of the engine 1. The exhaust emission control system 2 is connected with an exhaust manifold 7 of the engine 1 through an exhaust gas communication pipe 72. A partition wall body 112 is provided in an engine room 111 in which the engine 1 is installed. The partition wall body 112 shields an outer periphery of the exhaust gas communication pipe 72 from cooling air of the engine 1.

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) has been installed in the exhaust path of the engine, and a technology for purifying exhaust gas discharged from the diesel engine by using an oxidation catalyst or soot filter of the exhaust gas purification device has been developed. (For example, refer to 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 mounted thereon for environmental measures (for example, Patent Document 2). reference).

JP 2000-145430 A JP 2007-182705 A

  By the way, when the exhaust gas purifying device is provided, if the exhaust gas purifying device is simply disposed in the exhaust path of the engine instead of the muffler (muffler), the temperature of the exhaust gas is set to the exhaust gas in the exhaust gas purifying device. Difficult to maintain at the high temperature required for purification. For example, even if the support structure of the silencer in the construction machine disclosed in Patent Document 2 is diverted to the support structure of the exhaust gas purification device, the temperature of the exhaust gas in the exhaust gas purification device cannot be stably obtained. There is. In particular, in a work machine such as a wheel loader, it is required to make the traveling body compact in order to reduce the turning radius in order to prevent contact with the surroundings. In other words, in a work machine such as a wheel loader with limited engine mounting space, it is necessary to place the exhaust gas purification device separately from the engine, and the exhaust gas temperature decreases from the engine to the exhaust gas purification device. There are problems such as being easy to do.

  Further, when the exhaust gas purification device is supported close to the exhaust manifold of the engine, the exhaust gas temperature in the exhaust gas purification device is not easily lowered, but the vibration of the engine is transmitted to the exhaust gas purification device, and the exhaust gas purification device. There is also concern about the possibility of damage. It is necessary to support the exhaust gas purification device on the engine with a highly rigid support member.

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

  According to a first aspect of the present invention, an engine that drives a working unit and an exhaust gas purification device that processes exhaust gas of the engine are provided, and the exhaust gas purification device is connected to an exhaust manifold of the engine via an exhaust communication pipe. In the engine device, a partition wall is provided in an engine room in which the engine is installed, and an outer periphery of the exhaust communication pipe is shielded by the partition wall against cooling air of the engine.

  According to a second aspect of the present invention, in the engine device according to the first aspect, the engine room is partitioned by the partition wall, and an engine installation space in which the engine is installed and the exhaust communication pipe are provided. An exhaust communication pipe installation space is formed inside the engine room.

  According to a third aspect of the present invention, in the engine device according to the first aspect, the inner pipe formed on the outer peripheral side of the exhaust communication pipe includes a tail pipe that discharges exhaust gas from the exhaust gas purification apparatus to the outside of the machine. An outer tube formed by a part of the tail pipe is fitted.

  According to the first aspect of the present invention, the engine includes an engine that drives a working unit, and an exhaust gas purification device that processes exhaust gas of the engine, and the exhaust gas purification device is connected to an exhaust manifold of the engine via an exhaust communication pipe. In the engine device to be provided, a partition body is provided in an engine room in which the engine is installed, and an outer periphery of the exhaust communication pipe is shielded by the partition body against cooling air of the engine. It is difficult for the cooling air to directly hit the exhaust communication pipe, the temperature reduction of the exhaust gas in the exhaust gas purification apparatus can be suppressed, and the exhaust gas temperature in the exhaust gas purification apparatus can be maintained at a high temperature.

  According to the invention of claim 2, the engine room is partitioned by the partition wall, and an engine installation space in which the engine is installed and an exhaust communication tube installation space in which the exhaust communication pipe is installed are divided into the engine. Since it is configured to be formed inside the room, the exhaust communication pipe installation space can be formed by using a part of the engine room, and the exhaust communication pipe can be easily assembled in the engine room. Can do. Even if the exhaust gas purifying device is separated from and supported by the engine, the exhaust gas temperature in the exhaust gas purifying device can be prevented from being lowered, and the exhaust gas is mounted on the side of the machine on which the engine is mounted. The purification device can be supported, and the mounting structure of the exhaust gas purification device can be simplified.

  According to a third aspect of the present invention, the tail pipe for releasing the exhaust gas from the exhaust gas purification device to the outside of the machine is provided, and the inner pipe formed on the outer peripheral side of the exhaust communication pipe is formed at a part of the tail pipe. Since the outer pipe is fitted, the tail pipe is formed in a multiple structure outside the exhaust communication pipe, and the heat insulation structure of the exhaust communication pipe can be simplified. Can be easily suppressed. A heat insulating air layer can be easily formed between the inner pipe and the outer pipe, and the heat insulating property of the exhaust communication pipe can be further improved by the heat insulating air layer.

It is a left view of the wheel loader as one Embodiment of the working machine of this invention. It is a top view of the wheel loader shown in FIG. It is a left view of the diesel engine in 1st Embodiment of this invention. It is the same right view. It is the same front view. It is the same rear view. It is the same top view. It is the bottom view. 1 is an external perspective view of an exhaust gas purification device. It is a left view of the diesel engine in 2nd Embodiment of this invention. It is a left view of the diesel engine in 3rd Embodiment of this invention.

  Hereinafter, with reference to FIGS. 1-9, 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.

  A wheel loader 211 shown in FIGS. 1 and 2 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 the 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. A continuously regenerative exhaust gas purification device 2 (diesel particulate filter) is disposed behind the engine 1 and below the radiator 24. That is, the exhaust gas purification device 2 is remotely disposed below the counterweight 215 and the engine 1 with respect to the engine 1. As a result, the exhaust gas purifying device 2, which is a heavy object, functions as an auxiliary to the counterweight 215.

  The engine 1 is connected to an air cleaner 32 that sucks fresh air (external air) on the left side thereof, and an exhaust pipe (exhaust communication pipe) connected to the intake side of the exhaust gas purification device 2 on the right side thereof. ) 72. That is, since the air cleaner 32 and the exhaust communication pipe 72 are arranged at positions where the engine 1 is sandwiched therebetween, the air cleaner 32 and the exhaust communication pipe 72 are arranged at positions separated from each other. Therefore, it is possible to prevent the air cleaner 32 made of a resin molded product or the like from being thermally weak to be affected by deformation due to exhaust heat based on exhaust gas passing through the exhaust communication pipe 72.

  As described above, the engine 1, the exhaust gas purification device 2, the radiator 24, and the air cleaner 32 that are disposed on the lower rear side of the control seat 219 are covered with the bonnet 220 that is disposed on the upper side of the counterweight 215. The bonnet 220 is configured such that a rear part of the control unit 217 can be opened and closed, and a part in the control unit 217 is configured as a seat frame 221 protruding from the floor surface of the control unit 217.

  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 maintenance can be performed on the engine 1 and the like below the seat frame 221. 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, 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.

  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.

  Next, the engine device of the present invention will be described below with reference to FIGS. 3 to 8 by taking the diesel engine 1 mounted as a prime mover on a work machine such as the wheel loader 211 as an example. As described above, the diesel engine 1 includes the exhaust gas purification device 2 connected via the exhaust communication pipe 72. 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 in the oil pan 12 is supplied to each lubricating portion of the diesel engine 1 through an oil filter 13 disposed on the side surface of the cylinder block 4.

  A fuel supply pump 14 for supplying fuel is attached to the side of the cylinder block 4 above the oil filter 13 (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.

  A cooling water pump 21 for circulating cooling water is disposed coaxially with the fan shaft of the cooling fan 9 at a portion on the left side of the front 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 left side of the cooling water pump 21.

  Engine leg mounting portions 19 are respectively provided on the left and right side surfaces of the cylinder block 4. Each engine leg mounting portion 19 is bolted to an engine leg 34 having vibration-proof rubber 35 and connected to the left and right side walls of the body frame 94. The diesel engine 1 is supported by vibration isolation on the body frame 94 of the traveling machine body 216 in the work vehicle such as the wheel loader 211 via the engine legs 34. Thereby, it can suppress that the vibration of the diesel engine 1 is transmitted to the body frame 94.

  Further, the EGR device 26 (exhaust gas recirculation device) will be described. An air cleaner 32 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 mixes a part of the exhaust gas of the diesel engine (EGR gas from the exhaust manifold) and fresh air (external air from the air cleaner 80) and supplies the mixed gas to the intake manifold 6 (collector). 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 amount of EGR gas supplied to the EGR main body case 27 is adjusted by adjusting the opening degree 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 80 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 80 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.

  The radiator 24 is disposed behind the diesel engine 1 at a position facing the cooling fan 9 via a fan shroud (not shown). The radiator 24 is connected to the left and right side walls of the body frame 94 via an upper support bracket 57 having an anti-vibration rubber 59 on the upper side thereof, and is supported for anti-vibration. That is, the upper support bracket 57 is bolted to the support members 95 and 96 fixed to the left and right side wall portions of the body frame 94 and fixed so as to bridge the upper side of the left and right side wall portions of the body frame 94. The upper surface of the radiator 24 is connected to the upper support bracket 57 so that the radiator 24 is supported in an anti-vibration manner through an anti-vibration rubber 59. 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. Therefore, when the cooling fan 9 is driven to rotate and sucks outside air from behind the diesel engine 1, the radiator 24 and the oil cooler 25, which are heat exchangers, are each blown with outside air (cooling air) and air-cooled. It will be.

  One end of the air cleaner 32 is connected to the other end of the intake pipe 33 that is connected to the intake port of the intake throttle member 28. The air cleaner 32 is disposed on the left rear side of the diesel engine 1 by the intake pipe 33 extending toward the rear side of the diesel engine 1. That is, the air cleaner 32 is arranged on the left side of the radiator 24 arranged behind the diesel engine 1.

  Next, the exhaust gas purification device 2 will be described with reference to FIGS. 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. 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 in the exhaust gas moving direction (from the lower side to the upper side in FIG. 1). 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.

  A differential pressure sensor 44 integrally provided with an electrical wiring connector is attached to a sensor mounting table (sensor support portion) 98 provided on the upper side of the support frame 97. A differential pressure sensor 44 is disposed on the outer surface of the exhaust gas purification case 38. 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.

  An electrical wiring connector 51 is integrally provided on the outer case portion of the differential pressure sensor 44, and an electrical wiring connector (not shown) of the upstream gas temperature sensor 42 and an electrical wiring connector (not shown) of the downstream gas temperature sensor 43 are provided. (Omitted) is fixed to the sensor mounting table 98 of the support frame 97. The sensor mounting table 98 is configured by bending a metal plate extended above the support frame 97, and the differential pressure sensor 44 and the like are installed on the upper surface thereof.

  By the way, the support frame 97 is configured by a metal plate whose left and right ends are bent. The bent portions at the left and right ends of the support frame 97 serve as fastening portions 99 to the left and right side walls of the body frame 94. When the fastening portion 99 is bolted to the left and right side walls of the body frame 94, the support frame 97 is fixed to the body frame 94 so as to bridge the left and right side walls of the body frame 94. The support frame 97 fixed in this manner is disposed below the oil cooler 25 in a state where the plate surface is perpendicular to the left and right side walls of the body frame 94.

  In addition, a suspended body 55 is integrally formed on the outlet holding flange 45 of the exhaust gas purification case 38, and a hanging metal fitting 56 is provided on a side surface of the exhaust gas purification case 38 provided with the purification inlet pipe 36 on the side of the exhaust gas inlet. Fasten the bolts. In the diagonal direction of the exhaust gas purification case 38, the suspension body 55 and the suspension fitting 56 are arranged apart from each other. In an assembly plant of the diesel engine 1 or the like, the suspension body 55 and the suspension fitting 56 are locked to a hook (not shown) such as a chain block, and the exhaust gas purification case 38 is suspended and supported by the chain block or the like. An exhaust gas purification case 38 is assembled to the engine 1. Due to the diagonal arrangement of the suspension body 55 and the suspension fitting 56, the exhaust gas purification case 38, which is a heavy object, can be suspended in a stable posture.

  Further, in the exhaust gas purification case 38, a connecting leg (left bracket) 80 is detachably attached to the outlet pinching flange 45 by bolt fastening, and a fixed leg (right bracket) 81 is fixed by welding. 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 entrance side of the exhaust gas purification case 38, and the connecting leg 80 is installed on the exit 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 the support frame 97 fixed to the body frame 94. Accordingly, the exhaust gas purification device 2 is supported by being suspended from the body frame 94 via the support frame 97. That is, the exhaust gas purification device 2 is supported by the body frame 94 in which vibration transmission from the diesel engine 1 is suppressed. Therefore, since vibration transmission to the exhaust gas purification device 2 by the diesel engine 1 can be prevented, the durability of the exhaust gas purification device 2 can be improved and the life can be extended.

  In addition, the support frame 97 that supports the exhaust gas purification device 2 may be configured such that a lower support bracket 58 connected to the lower side of the radiator 24 abuts on a sensor mounting table 98 that is configured at the upper portion thereof. Similar to the upper support bracket 57 that fixes the upper portion of the radiator 24, the lower support bracket 58 includes an anti-vibration rubber 60 and is supported in an anti-vibration manner on the support frame 97. In addition, the lower support bracket 58 may be connected to the sensor mounting table 98, and the lower support bracket 58 may be fixed by the support frame 97. Further, the lower support bracket 58 may be configured integrally with the support frame 97.

  An exhaust communication pipe 72 that connects the purification inlet pipe 36 and the relay pipe 66 of the exhaust gas purification apparatus 2 has a bellows-shaped flexible pipe 73 in a part thereof. In the configuration example according to FIGS. 3 to 8, the flexible pipe 73 is provided at a position between the position where the exhaust communication pipe 72 is bent downward on the rear side of the diesel engine 1 and the connection portion with the purification inlet pipe 36. By providing the flexible pipe 73 in the exhaust communication pipe 72, a load based on the vibration of the diesel engine 1 can be absorbed by the flexible pipe 72 in the exhaust communication pipe 72 serving as a connection path with the diesel engine 1. Therefore, not only can the exhaust communication pipe 72 be prevented from being damaged, but also the exhaust gas purification device 2 can be protected from vibration of the diesel engine 1.

  Next, as shown in FIG. 3, an 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).

  On the other hand, as shown in FIGS. 3, 6, and 7, an exhaust throttle device 65 that increases the exhaust pressure of the diesel engine 1 is provided. 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 containing the exhaust 3, an actuator case 69 containing a power transmission mechanism from a motor (actuator) that controls opening of the exhaust throttle valve, and an actuator case 69 in the throttle valve case 68. A water cooling case 70 is provided. By the power transmission mechanism, the motor is configured such that the rotation shaft thereof 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. A lateral opening of the relay pipe 66 is connected to the purification inlet pipe 36 via the exhaust communication pipe 72. 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 of the exhaust manifold 7 into the exhaust gas purification device 2 through the purification inlet pipe 36 is purified by the exhaust gas purification device 2 and then moved from the purification outlet pipe 37 to the tail pipe 135. Finally, it will be discharged out of the machine.

  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. That is, when soot accumulates on the soot filter 40, the exhaust pressure of the diesel engine 1 is increased by controlling the exhaust throttle valve of the exhaust throttle device 65 to close, so that the exhaust is discharged from the diesel engine 1. The exhaust gas temperature is increased to a high temperature, and the soot accumulated on the soot filter 40 is burned. 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, as an exhaust gas temperature raising mechanism for maintaining the exhaust gas purification capability of the exhaust gas purification device 2, a heater for directly increasing the temperature of exhaust gas sent to may be provided. 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 exhaust communication pipe 72 connects the throttle valve case 68 to the exhaust outlet. To the exhaust manifold 7. Accordingly, 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 is connected to the exhaust manifold 7 via the relay pipe 66. Compared with the structure connecting 68, the exhaust gas intake side volume 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. The exhaust connection pipe 72 is connected to the relay pipe 66 in the uppermost layer portion. Therefore, without changing the support posture of the exhaust throttle device 65 and without changing the specifications of the relay pipe 66, for example, according to the mounting position of the exhaust gas purification device 2, the mounting posture of the relay pipe 66 (exhaust communication pipe) 72 connecting directions) 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. Accordingly, 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, for example, corresponding to the arrangement of the exhaust gas purification device 2, etc. From the throttle valve gas outlet of the throttle valve case 68, the exhaust communication pipe 72 can be extended sideways or upward. Therefore, the exhaust gas purification device 2 can be functionally supported inside and outside the engine room of the work vehicle (components other than the diesel engine 1). Further, the cooling water pipes (throttle outlet side pipe 77, throttle inlet side pipe 78, etc.) connected to the exhaust throttle device 65 and the EGR cooler 29 can be compactly supported using the outer surface of the exhaust manifold 7.

  On the other hand, on the left side of the diesel engine 1 (exhaust manifold 7 side), a cooling water piping path (flexible cooling water return hose 75, intermediate pipe 76, connecting the cooling water pump 21 to the EGR cooler 29 and the exhaust throttle device 65, A throttle outlet side pipe 77, a throttle inlet side pipe 78, a cooling water take-out hose 79, and the like. 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.

  One end side of the alloy intermediate pipe 76 is connected to the return hose 75, and one end side of the alloy throttle outlet side pipe 77 is connected to the other end side of the alloy intermediate pipe 76 via a flexible hose 76a. The other end of the throttle outlet side pipe 77 is connected to the water cooling case 70 of the exhaust throttle device 65 via a flexible hose (not shown) and the like, and one end side of the alloy throttle inlet side pipe 78 is connected to the water cooling case 70. A flexible hose (not shown) or the like is connected, and the other end of the throttle inlet side pipe 78 is connected to the cooling water drain of the EGR cooler 29 via a flexible hose (not shown) or the like. A cooling water intake port of the EGR cooler 29 is connected to the cylinder block 4 via a cooling water extraction hose 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, 76 a, 79 and the pipes 76 to 78. An exhaust throttle device 65 is located upstream 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.

  Thus, the exhaust throttle device 65 to which a part of the cooling water is supplied is supplied with the cooling water from the throttle outlet side pipe 77 and discharges the cooling water to the throttle inlet side pipe 78. Therefore, the water supply position and the water discharge position of the cooling water to the water cooling case 70 are opposite to the intake position and the exhaust position of the exhaust gas flowing through the throttle valve case 68. That is, the water supply position of the cooling water in the water cooling case 70 is on the upper side compared to the drainage position, so that the reverse flow of the cooling water flowing in the water cooling case 70 can be more reliably prevented.

  Next, the heat insulating structure of the exhaust communication pipe 72 will be described with reference to FIGS. 3 and 5 to 7. As shown in FIGS. 5 to 7, the engine room 111 is formed by the radiator 24 or the body frame 94, and the diesel engine 1 is installed in the engine room 111, and the inner surface side of the body frame 94 (inside the engine room 111). ) Are provided with a partition wall 112, both ends of the partition wall 112 are fixed to the inner surface of the fuselage frame 94, and an outer periphery of the vertical portion of the exhaust communication pipe 72 and the flexible pipe extending vertically along the inner surface of the fuselage frame 94. 73 is surrounded by a partition wall 112, and the outer periphery of the exhaust communication pipe 72 is shielded by the partition wall 112 against the cooling fan 9 wind of the diesel engine 1.

  That is, the interior of the engine room 111 is partitioned by a partition wall 112, and an engine installation space 111a in which the diesel engine 1 is installed, and an exhaust communication pipe installation space 111b in which the exhaust communication pipe 72 and the flexible pipe 73 are installed It is formed inside the room 111 so that the wind of the cooling fan 9 of the diesel engine 1 is difficult to directly hit the exhaust communication pipe 72, and the exhaust communication pipe 72 and consequently the exhaust gas temperature inside the exhaust gas purification device 2 can be suppressed from decreasing. Yes.

  As shown in FIGS. 1 and 3 to 9, a diesel engine 1 that drives the working unit 212 and an exhaust gas purification device 2 that processes the exhaust gas of the diesel engine 1 are provided, and the exhaust manifold 7 of the diesel engine 1 is in communication with the exhaust. In the engine device to which the exhaust gas purification device 2 is connected via the pipe 72, a partition body 112 is provided in the engine room 111 in which the diesel engine 1 is installed, and the exhaust communication pipe 72 is connected to the cooling air of the diesel engine 1. The outer periphery is shielded by the partition body 112. Therefore, it is difficult for the cooling air of the diesel engine 1 to directly hit the exhaust communication pipe 72, the temperature reduction of the exhaust gas inside the exhaust communication pipe 72 and consequently the exhaust gas purification device 2 can be suppressed, and the exhaust gas temperature inside the exhaust gas purification device 2 can be reduced. High temperature can be maintained.

  As shown in FIGS. 3 to 9, the engine room 111 is partitioned by a partition wall 112, an engine installation space 111 a in which the diesel engine 1 is installed, and an exhaust communication pipe installation space 111 b in which an exhaust communication pipe 72 is installed. Is formed inside the engine room 111. Therefore, the exhaust communication pipe installation space 111 b can be formed by using a part of the engine room 111, and the exhaust communication pipe 72 can be easily assembled in the engine room 111. Even if the exhaust gas purifying device 2 is separated from the diesel engine 1 and supported, the exhaust gas temperature in the exhaust gas purifying device 2 can be prevented from decreasing, and the diesel engine 1 is mounted on the main unit side. The exhaust gas purification device 2 can be supported, and the mounting structure of the exhaust gas purification device 2 can be simplified.

  Note that a high reflectance paint that prevents heat radiation due to radiation is applied to the inner surface of the partition wall 112 that forms the exhaust communication pipe installation space 111b, or a high reflectance material is pasted, and the exhaust communication pipe 72 (exhaust gas purification device). You may suppress the temperature fall of the exhaust gas of 2). In addition, a low emissivity paint that prevents heat dissipation is applied to the outer peripheral surface of the exhaust communication pipe 72 or a low emissivity material is wrapped around the exhaust communication pipe 72 to suppress a decrease in exhaust gas temperature in the exhaust communication pipe 72 (exhaust gas purification device 2). May be.

  Next, FIG. 10 shows 2nd Embodiment, The modification of the heat insulation structure of the said exhaust communication pipe 72 is demonstrated. As shown in FIG. 10, a gear case 115 on which the cooling fan 9 or the cooling fan driving V-belt 22 is disposed is provided on the front side of the cylinder block 4 of the diesel engine 1, and the support legs are provided below one side of the cylinder block 4. The exhaust gas purification device 2 is fixed through the body 116. In addition, an intermediate portion of the exhaust communication pipe 72 that allows the purification inlet pipe 36 to communicate with the relay pipe 66 is passed through the gear case 115. That is, it is possible to suppress the middle portion of the exhaust communication pipe 72 from being cooled by the cooling fan 9 wind, and to reduce the temperature drop of the exhaust gas supplied to the exhaust gas purification device 2.

  Next, FIG. 11 shows 3rd Embodiment, The modification of the heat insulation structure of the said exhaust communication pipe 72 is demonstrated. As shown in FIG. 11, a tail pipe 117 is communicated with a purification outlet pipe 37 that discharges exhaust gas from the exhaust gas purification device 2 to the outside of the apparatus. Further, an inner pipe 118 is provided on the outer peripheral side of the exhaust communication pipe 72, and a double-pipe structure is formed in which a heat insulating air layer is formed between the exhaust communication pipe 72 and the inner pipe 118. In addition, an outer pipe 117 a formed by a part of the tail pipe 117 is fitted on an inner pipe 118 formed on the outer peripheral side of the exhaust communication pipe 72, and the tail pipe 117 is multi-structured outside the exhaust communication pipe 72. Is formed.

  As shown in FIG. 11, a tail pipe 117 for releasing exhaust gas from the exhaust gas purification device 2 to the outside of the machine is provided, and an inner pipe 118 formed on the outer peripheral side of the exhaust communication pipe 72 is formed at a part of the tail pipe 117. The outer tube 117a to be fitted is fitted. Therefore, the tail pipe 117 can be formed in a multiple structure on the outside of the exhaust communication pipe 72 to simplify the heat insulation structure of the exhaust communication pipe 72, but heat dissipation of the inner pipe 118 can be easily suppressed. A heat insulating air layer can be easily formed between the inner pipe 118 and the outer pipe 117a, and the heat insulating property of the exhaust communication pipe 72 can be further improved by the heat insulating air layer.

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Exhaust gas purification apparatus 7 Exhaust manifold 72 Exhaust communication pipe 111 Engine room 112 Partition body 117 Tail pipe 117a Outer pipe 118 Inner pipe 212 Loader apparatus (working part)

Claims (3)

In an engine device comprising an engine that drives a working unit, and an exhaust gas purification device that processes exhaust gas of the engine, wherein the exhaust gas purification device is connected to an exhaust manifold of the engine via an exhaust communication pipe.
An engine device characterized in that a partition body is provided in an engine room in which the engine is installed, and an outer periphery of the exhaust communication pipe is shielded by the partition body against cooling air of the engine.   The engine room is partitioned by the partition wall, and an engine installation space in which the engine is installed and an exhaust communication pipe installation space in which the exhaust communication pipe is installed are formed in the engine room. The engine device according to claim 1, wherein A tail pipe for releasing exhaust gas from the exhaust gas purification device to the outside of the machine is provided, and an outer pipe formed by a part of the tail pipe is fitted to an inner pipe formed on the outer peripheral side of the exhaust communication pipe. The engine device according to claim 1.

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