JP6051078B2 - Engine equipment - Google Patents

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. 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 invention of the present application is an engine device mounted on a work machine in which a control seat is arranged on a bonnet provided at a rear portion of a traveling machine body and an engine is arranged in the bonnet, and the work machine is located behind the engine. A heat exchanger provided at a position facing a cooling fan provided in the engine, and the heat exchanger is supported by a support member that bridges between the left and right side walls of the body frame of the traveling aircraft, An exhaust manifold provided on the left and right side surfaces of the engine and having an exhaust gas outlet on the upper side, and supported above the exhaust manifold, and an exhaust gas inlet side connected to the exhaust gas outlet side of the exhaust manifold. An exhaust gas purifying device for purifying the exhaust gas of the engine, the exhaust gas purifying device, the head cover of the engine and the front Between one of the left and right inner surfaces of the bonnet, it is arranged in parallel to the left and right side surfaces of the engine, and toward the other side of the left and right inner surfaces of the bonnet in the engine, facing the rear of the engine An air cleaner is connected via an extending intake pipe, and a portion of the exhaust gas purification device is disposed above the upper end of the support member, while the air cleaner is disposed below the upper end of the support member, The air cleaner is located on the opposite side of the exhaust gas purification device and behind the engine with the engine interposed therebetween.

In the engine device, the exhaust gas purifier may be those configured to be supported by the linked support on the cylinder head of the engine.

In the engine apparatus, the support body includes a first bracket leg fixed on a cooling fan side of the engine and a second bracket leg fixed on a flywheel housing side of the engine, and the first bracket with legs for supporting the upstream side of the exhaust gas moving direction of the exhaust gas purifier may be those wherein the second bracket leg is configured to support the downstream side of the exhaust gas moving direction in the exhaust gas purifying device.

In the engine device, the exhaust gas purifier may be those configured for coupling to the exhaust manifold in position between the said first bracket leg the second bracket leg.

In the engine device, the exhaust gas purification device communicates with a gas purification body that purifies exhaust gas discharged from the engine, a purification casing that houses the gas purification body, and an exhaust gas inlet of the purification casing. An exhaust gas inlet pipe connected to the exhaust gas outlet side of the exhaust manifold, and an exhaust gas outlet pipe communicating with the exhaust gas outlet of the purification casing, wherein the purification casing of the pipe wall of the exhaust gas inlet pipe It is good also as a structure which was made to incline so that the part extended along may approach the outer side surface of the said purification | cleaning casing as it goes to the exhaust gas exit side from the exhaust gas inlet side of the said exhaust gas inlet pipe.

According to the present invention, there is provided an engine device mounted on a work machine in which a control seat is disposed on a hood provided at a rear portion of a traveling machine body and an engine is disposed in the bonnet. And an exhaust manifold having an exhaust gas outlet on the upper side, and an exhaust gas that is supported above the exhaust manifold and that is connected to an exhaust gas outlet side of the exhaust manifold to purify the exhaust gas of the engine A purification device, wherein the exhaust gas purification device is disposed in parallel with the left and right side surfaces of the engine between the head cover of the engine and one of the left and right inner surfaces of the bonnet. An intake pipe extending toward the rear of the engine is connected to the intake port facing the other of the left and right inner surfaces of the bonnet. Since an air cleaner is connected and the air cleaner is located on the opposite side of the exhaust gas purification device and behind the engine with the engine in between, it is highly rigid as one of the components of the engine. The exhaust gas purification device can be firmly connected to the exhaust manifold, which is a component, and damage to the exhaust gas purification device due to vibration of the engine can be prevented. Since the exhaust gas purification device can communicate with the exhaust manifold of the engine at a close distance, it is easy to maintain the exhaust gas purification device at an appropriate temperature, and high exhaust gas purification performance can be maintained. In addition, a dead space between the head cover of the engine and the left and right inner surfaces of the bonnet can be effectively used as an arrangement space for the exhaust gas purification device, and the utilization efficiency of the bonnet internal space can be improved. Furthermore, the exhaust gas purifying device can be incorporated into the engine and shipped at the production site of the engine.

According to the present invention, since the exhaust gas purification device is configured to be supported by a support body connected to the cylinder head of the engine, the exhaust gas purification device is a highly rigid component, and the exhaust manifold and The cylinder head is stably connected and supported. Therefore, it is possible to suppress damage to the exhaust gas purification device due to vibration of the engine or the like.

According to the present invention, the support is a first bracket leg fixed on the cooling fan side of the engine and a second bracket leg fixed on the flywheel housing side of the engine, and the first bracket Since the leg supports the upstream side in the exhaust gas movement direction in the exhaust gas purification device, the second bracket leg is configured to support the downstream side in the exhaust gas movement direction in the exhaust gas purification device. The upstream side and the downstream side of the exhaust gas purification device can be stably supported by the cylinder head, which is a highly rigid component. That is, in the cylindrical exhaust gas purifying apparatus whose longitudinal direction is the exhaust gas movement direction, both end portions in the longitudinal direction are supported by the first and second bracket legs, so that the stability to the engine is improved. The arrangement of the exhaust gas purification device having a high height can be realized.

According to the present invention, the exhaust gas purifying device is configured to be connected to the exhaust manifold at a position between the first bracket leg and the second bracket leg. It can be supported at three points in the exhaust gas movement direction. Therefore, in the cylindrical exhaust gas purification apparatus whose longitudinal direction is the exhaust gas movement direction, it is possible to realize connection and fixation with higher stability to the engine.

According to the present invention, the exhaust gas purification device communicates with a gas purification body that purifies the exhaust gas discharged from the engine, a purification casing that houses the gas purification body, and an exhaust gas inlet of the purification casing. An exhaust gas inlet pipe connected to the exhaust gas outlet side of the exhaust manifold, and an exhaust gas outlet pipe communicating with the exhaust gas outlet of the purification casing, wherein the purification casing of the pipe wall of the exhaust gas inlet pipe Since the portion extending along the direction from the exhaust gas inlet side of the exhaust gas inlet pipe toward the exhaust gas outlet side is inclined so as to approach the outer surface of the purification casing, The exhaust casing can be heated by the exhaust gas in the exhaust gas inlet pipe (in the introduction passage) and passes through the purification casing. It is possible to suppress a decrease in temperature. Therefore, the exhaust gas purification performance of the exhaust gas purification device can be improved. The inclined shape of the portion extending along the purification casing in the pipe wall can be a guide surface for sending exhaust gas to the exhaust gas inlet. The exhaust gas inlet pipe can be used as a strength member of the purification casing, and the purification casing can be improved in rigidity with a simple configuration without increasing the thickness of the purification casing or extremely increasing the number of parts. However, the exhaust gas from the engine can be smoothly guided into the purification casing by the inclined shape of the portion extending along the purification casing in the pipe wall. Exhaust gas can be supplied to a wide area of the gas purification body in the purification casing, contributing to efficient use of the gas purification body.

It is a left view of the wheel loader used as an example in the embodiment of the working machine of the present invention. 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. It is the perspective view seen from the cooling fan side of the diesel engine in the embodiment of the present invention. It is the same right view. It is the left side view. It is the same front view. It is the same top view. It is a section explanatory view of an exhaust gas purification device. It is an expanded side sectional view of the exhaust gas upstream side in the exhaust gas purification device. It is a side view of the forklift car which becomes another example in embodiment of the working machine of this invention. It is a top view of the forklift car of FIG.

  Hereinafter, an embodiment of an engine device of the present invention and a work machine including the engine device will be described with reference to the drawings with reference to FIGS. 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.

  The wheel loader 211 shown in FIGS. 1 to 3 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. A continuously regenerative exhaust gas purification device 2 (diesel particulate filter) is disposed on the upper right side of the engine 1.

  That is, the exhaust gas purification device 2 is configured in a substantially cylindrical shape extending in the front-rear direction parallel to the output shaft (crankshaft) of the engine 1 and is disposed on the exhaust manifold 7 (see FIG. 4) of the engine 1. Is done. An exhaust pipe 72 having one end connected to the rear end face of the exhaust gas purifying device 2 has a configuration bent toward the lower side of the engine 1 at the rear of the engine 1, and below the counterweight 215. It connects with the tail pipe 135 arrange | positioned at the other edge part.

  The engine 1 is connected to an air cleaner 32 that sucks fresh air (external air) on the left side. That is, the air cleaner 32 is disposed at a position on the opposite side of the exhaust gas purification device 2 with the engine 1 in between, and the air cleaner 32 and the exhaust gas purification device 2 are disposed 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 from 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 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, as in the example shown in FIG. 3, 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. 4 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 to the exhaust outlet of the exhaust manifold 7. 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 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, an exhaust outlet of the exhaust manifold 7 is opened upward, and an EGR cooler 29 for cooling the EGR gas is disposed 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 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.

  That is, one end side of the alloy intermediate pipe 76 is connected to the return hose 75 connected to the cooling water pump 21, and the other end side of the alloy intermediate pipe 76 is connected via the flexible hose 76 a. A cooling water intake port of the EGR cooler 29 is connected to the cylinder block 4 via a cooling water extraction hose 79. Therefore, a part of the cooling water from the cooling water pump 21 is supplied from the cylinder block 4 to the EGR cooler 29 and circulates.

  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 is configured in a substantially cylindrical shape that extends long in the front-rear direction parallel to the output shaft (crankshaft) of the diesel engine 1, and is disposed on the exhaust manifold 7. A purification inlet pipe (exhaust gas inlet pipe) 36 and a purification outlet pipe (exhaust gas outlet pipe) 37 are provided on both front and rear sides (upstream and downstream sides in the exhaust gas movement direction) of the exhaust gas purification device 2. It is provided separately in the front and rear. A purification inlet pipe 36 that is an exhaust gas intake side of the exhaust gas purification apparatus 2 is detachably bolted to the exhaust manifold 7 of the diesel engine 1, and a purification outlet pipe that is an exhaust gas discharge side of the exhaust gas purification apparatus 2 A tail pipe 135 is connected to 37 through an exhaust pipe 72.

  As shown in FIG. 9, the exhaust gas purifying device 2 is connected to an exhaust gas purifying case (DPF casing) 38 as a purifying casing made of a heat-resistant metal material via cylindrical inner cases 304 and 320, for example, platinum or the like. The diesel oxidation catalyst 39 and the soot filter 40 having a honeycomb structure are arranged in series and accommodated. The rear portion of the exhaust gas purification case 38 is formed by the silencer 41, and the purification outlet pipe 37 is connected to the exhaust pipe 72 at the rear end face of the silencer 41.

  As shown in FIGS. 4 to 8, the exhaust gas purifying device 2 is provided with a flange-side bracket leg 80 (first bracket leg) and a casing-side bracket leg 81 (second bracket leg) as a support. The cylinder head 5 and the exhaust manifold 7 of the diesel engine 1 are attached. In this case, the base end side of the flange side bracket leg 80 is detachably bolted to the outlet holding flange 353 on the outer peripheral side of the exhaust gas purification case 38. Also, the base end side of the casing side bracket leg 81 is detachably bolted to the catalyst outer lid body 309 of the exhaust gas purification case 38.

  The flange side bracket leg 80 is bolted to the side surface of the cylinder head 5 on the exhaust manifold 7 side at the tip side, and also on the side surface of the cylinder head 5 on the cooling fan 9 side via the auxiliary bracket 80a. The bolt is fastened. Thereby, the front end side of the flange side bracket 80 is detachably bolted to the side surface on the cooling fan 9 side and the side surface on the exhaust manifold 7 side in the cylinder head 5. At this time, the flange side bracket 80 may be configured integrally with the auxiliary bracket 80a.

  Moreover, the front end side of the casing side bracket leg 81 is detachably bolted to the side surface of the cylinder head 5 on the flywheel housing 10 side via an auxiliary bracket 81a. At this time, the casing side bracket leg 81 may be configured integrally with the auxiliary bracket 81a, similarly to the flange side bracket leg 80.

  By connecting the inlet flange body 317 of the purification inlet pipe 36 to the outlet portion of the exhaust manifold 7, the exhaust gas purification device 2 is connected to the exhaust manifold 7 through the purification inlet pipe 36. As a result, the exhaust gas purification device 2 connected to the diesel engine 1 by the bracket legs 80 and 81 is stably connected and supported by the exhaust manifold 7 and the cylinder head 5 which are high rigidity parts of the diesel engine 1. Become. Therefore, it is possible to suppress damage to the exhaust gas purification device 2 due to vibration or the like.

  In the above configuration, the exhaust gas of the diesel engine 1 flows from the exhaust manifold 7 of the diesel engine 1 to the diesel oxidation catalyst 39 side in the exhaust gas purification case 38 and moves from the diesel oxidation catalyst 39 to the soot filter 40 side. To be purified. Particulate matter in the exhaust gas cannot pass through the porous partition walls between the cells in the soot filter 40. That is, the particulate matter in the exhaust gas is collected by the soot filter 40. Thereafter, exhaust gas that has passed through the diesel oxidation catalyst 39 and the soot filter 40 is discharged from the tail pipe 135.

  When the exhaust gas passes through the diesel oxidation catalyst 39 and the soot filter 40, if the temperature of the exhaust gas exceeds a reproducible temperature (for example, about 300 ° C.), the diesel oxidation catalyst 39 causes an action in the exhaust gas. NO (nitrogen monoxide) is oxidized to unstable NO2 (nitrogen dioxide). The particulate matter collected by the soot filter 40 is oxidized and removed by O (oxygen) released when NO2 returns to NO. When particulate matter is accumulated on the soot filter 40, the particulate matter is oxidized and removed if the exhaust gas temperature is maintained at a temperature higher than the recyclable temperature, so that the particulate matter collecting ability of the soot filter 40 is restored. (Soot filter 40 regenerates).

  As shown in FIGS. 9 and 10, the diesel oxidation catalyst 39 is provided in a substantially cylindrical catalyst inner case 304 made of a heat-resistant metal material. The catalyst inner case 304 is made of a heat-resistant metal material and is provided in a substantially cylindrical catalyst outer case 305. That is, the catalyst inner case 304 is fitted on the outside of the diesel oxidation catalyst 39 through the mat-like catalyst heat insulating material 306 made of ceramic fiber. A catalyst heat insulating material 306 is pressed between the diesel oxidation catalyst 39 and the catalyst inner case 304 to protect the diesel oxidation catalyst 39. Further, the catalyst outer case 305 is fitted on the outer side of the catalyst inner case 304 via a thin plate support 307 having a substantially S-shaped cross section. The catalyst outer case 305 is one of the elements constituting the exhaust gas purification case 38 described above. The stress (mechanical vibration and deformation force) of the catalyst outer case 305 transmitted to the catalyst inner case 304 is reduced by the thin plate support 307.

  A disc-shaped catalyst inner lid body 308 is fixed to one end of the catalyst inner case 304 and the catalyst outer case 305 by welding, and the catalyst outer lid body 9 is bolted and attached to the outer surface side of the catalyst inner lid body 308. It is fastened with a nut. The gas inflow side end surface 38a of the diesel oxidation catalyst 38 and the catalyst inner lid body 308 are separated from each other by a predetermined distance L1, and the exhaust gas inflow space 311 is provided between the gas inflow side end surface 302a and the catalyst inner lid body 308. Is formed. Further, an exhaust gas inlet 312 facing the exhaust gas inflow space 311 is opened in the catalyst inner case 304 and the catalyst outer case 305. The opening edge of the exhaust gas inlet 312 in the catalyst outer case 305 is bent toward the catalyst inner case 304. Since the bent edge closes the gap between the opening edge of the catalyst inner case 304 and the opening edge of the catalyst outer case 305, the exhaust gas flows between the catalyst inner case 304 and the catalyst outer case 305. Can be prevented.

  A purification inlet pipe 36 is disposed on the outer surface of the catalyst outer case 305 where the exhaust gas inlet 312 is formed. The purification inlet pipe 36 is formed in a half-cylinder shape that opens upward, and a rectangular upward opening end portion 36b that is on the large diameter side covers the exhaust gas inlet 312 and the length (left and right) of the catalyst outer case 305. ) And fixed to the outer surface of the catalyst outer case 305 by welding. Therefore, the upward opening end portion 36 b on the exhaust gas outlet side of the purification inlet pipe 36 is connected in communication with the exhaust gas inlet 312 of the catalyst outer case 305. A small-diameter perfect circular downward opening end portion 36a is opened at the right end portion of the purification inlet pipe 36 near the longitudinal middle portion of the catalyst outer case 305 as the exhaust gas inlet side. An inlet flange body 317 is fixed by welding to the outer peripheral portion of the downward opening end portion 36a. The inlet flange body 317 is detachably bolted to the exhaust gas discharge side of the exhaust manifold 7.

  The left end side of the purification inlet pipe 36 covers the exhaust gas inlet 312 of the catalyst outer case 305 from the outside. A downward opening end portion 36 a as an exhaust gas inlet side is formed at the right end portion of the purification inlet pipe 36. That is, the downward opening end portion 36a of the purification inlet pipe 36 with respect to the exhaust gas inlet 312 is offset from the exhaust gas downstream side in the exhaust gas purification case 38 (positioned on the right side of the catalyst outer case 305). Are provided in a staggered manner). The upward opening end portion 36 b of the purification inlet pipe 36 is welded and fixed to the outer surface of the catalyst outer case 305 so as to cover the exhaust gas inlet 312 and extend in the longitudinal (front-rear) direction of the catalyst outer case 305. . Therefore, the exhaust gas introduction passage 200 is formed by the outer surface of the catalyst outer case 305 and the inner surface of the pipe wall 201 of the purification inlet pipe 36.

  As a result, the exhaust gas purification case 38 (catalyst outer case 305) can be heated by the exhaust gas in the purification inlet pipe 36 (inside the introduction passage 200), and the exhaust gas passing through the exhaust gas purification case 38 (catalyst outer case 305). It is possible to suppress a decrease in gas temperature. Therefore, the exhaust gas purification performance of the exhaust gas purification device 2 can be improved. Further, the purification inlet pipe 36 can be used as a strength member of the exhaust gas purification case 38 (catalyst outer case 305), and the exhaust gas purification case 38 (catalyst outer case 305) is made thicker or the number of parts is extremely increased. In addition, the rigidity of the exhaust gas purification case 38 (catalyst outer case 305) can be improved with a simple configuration.

  Further, a portion of the pipe wall 201 of the purification inlet pipe 36 that extends along the exhaust gas purification case 38 (catalyst outer case 305) extends from the exhaust gas inlet side (downward opening end 36a) of the purification inlet pipe 36 to the exhaust gas outlet. The longitudinally inclined portion 202 is inclined so as to approach the outer surface of the exhaust gas purification case 38 (catalyst outer case 305) toward the side (upward opening end portion 36b). In other words, a portion of the pipe wall 201 extending along the exhaust gas purification case 38 (catalyst outer case 305) is a longitudinally inclined portion 202 having a shape in which a corner is cut off obliquely in a side view. The inner side surface of the longitudinally inclined portion 202 of the purification inlet pipe 36 covers the exhaust gas inlet 312 of the exhaust gas purification case 38 (catalyst outer case 305), and exhaust gas flowing in from the exhaust manifold 7 is exhaust gas inlet 312. It is comprised so that it may drift in the direction of.

  In the above configuration, the exhaust gas flowing into the purification inlet pipe 36 from the exhaust manifold 7 collides with the inner side surface of the longitudinally inclined portion 202 of the purification inlet pipe 36 and drifts toward the exhaust gas inlet 312, and the exhaust gas flow The gas is smoothly guided into the exhaust gas inflow space 311 via the inlet 312. That is, the inner surface of the longitudinally inclined portion 202 of the purification inlet pipe 36 is used as a guide surface for sending exhaust gas to the exhaust gas inlet 312, and the purification inlet pipe 36 is used for the strength of the exhaust gas purification case 38 (catalyst outer case 305). Available as a member.

  Thereby, the rigidity of the exhaust gas purification case 38 (catalyst outer case 305) can be improved with a simple configuration without increasing the thickness of the exhaust gas purification case 38 (catalyst outer case 305) or increasing the number of parts extremely. However, the exhaust gas from the exhaust manifold 7 can be smoothly guided into the exhaust gas purification case 38 (catalyst outer case 305) by the inner side surface of the longitudinally inclined portion 202 of the purification inlet pipe 36. Therefore, exhaust gas can be supplied to a wide area of the diesel oxidation catalyst 39 which is a gas purifier in the DPF casing 60 (catalyst outer case 5), which contributes to efficient use of the diesel oxidation catalyst 39.

  On the other hand, a portion of the pipe wall 201 of the purification inlet pipe 36 near the purification outlet pipe 37 that is also an exhaust gas outlet is from the exhaust gas inlet side (downward opening end portion 36a) of the purification inlet pipe 36 to the exhaust gas outlet side (upward). It forms in the short inclination part 203 inclined so that it may leave | separate from the centerline C of an exhaust-gas inlet side (downward opening edge part 36a) as it goes to the opening edge part 36b). In other words, a substantially half of the tube wall 201 near the purification outlet tube 37 is a trumpet-shaped short inclined portion 203 whose radius increases toward the upward opening end 36b and the downward opening end 36a.

  In this way, by forming the short inclined portion 203 on the pipe wall 201, the exhaust gas is discharged from the exhaust gas purification case 38 (catalyst) on the inner wall surface of the purification inlet pipe 36 near the purification outlet pipe 37. Although it collides with the outer surface of the outer case 305), the volume of the part is ensured. Therefore, the swirl flow and the turbulent flow can be formed on the exhaust gas upstream side of the exhaust gas inlet 312. Therefore, the exhaust gas can be evenly supplied more reliably by the end surface 39a (gas inflow side end surface 39a) on the exhaust gas upstream side of the diesel oxidation catalyst 39.

  Furthermore, a concave surface portion 204 that is recessed outward is formed on the inner surface side of the catalyst inner lid 308 in the side end portion near the exhaust gas inlet 312 in the exhaust gas purification case 38 (catalyst outer case 305). Therefore, the catalyst inner lid body 308 has a bowl shape in which the substantially central portion on the inner surface side is recessed most due to the presence of the concave surface portion 204. For this reason, exhaust gas can be supplied from the exhaust gas inlet 312 of the exhaust gas purification case 38 (catalyst outer case 305) toward the concave surface portion 204 of the catalyst inner lid 308, and the exhaust gas diffusing action by the concave surface portion 204 allows diesel. A swirling flow or turbulent flow can be easily formed on the exhaust gas upstream side (exhaust gas inflow space 311) of the oxidation catalyst 39. For this reason, exhaust gas can be supplied as evenly as possible to the exhaust gas upstream end surface (gas inflow side end surface 39a) of the diesel oxidation catalyst 39.

  In the above configuration, the exhaust gas of the diesel engine 1 enters the exhaust gas inlet pipe 16 from the exhaust manifold 7, enters the exhaust gas inflow space 311 from the purification inlet pipe 36 through the exhaust gas inlet 312, and the diesel oxidation catalyst 39. The gas is supplied from the front gas inflow end surface 39a. Nitrogen dioxide (NO 2) is generated by the oxidation action of the diesel oxidation catalyst 39.

  In addition, the soot filter 40 is provided in a substantially cylindrical filter inner case 320 made of a heat-resistant metal material. The filter inner case 320 is provided in a substantially cylindrical filter outer case 321 made of a heat-resistant metal material. That is, the filter inner case 320 is fitted on the outside of the soot filter 40 via the mat-shaped filter heat insulating material 322 made of ceramic fiber. The filter outer case 321 is one of the elements constituting the exhaust gas purification case 38 together with the catalyst outer case 305. A filter heat insulating material 322 is press-fitted between the soot filter 40 and the filter inner case 320 to protect the soot filter 40.

  The catalyst inner case 304 that is formed in a cylindrical shape with a straight ridge line is constituted by an upstream cylinder part 304 a that houses the diesel oxidation catalyst 39 and a downstream cylinder part 304 b into which the filter inner case 320 is inserted. In addition, the upstream side cylinder part 304a and the downstream side cylinder part 304b are cylinders of substantially the same diameter, and are integrally formed. Further, a thin ring-shaped catalyst side joint flange 325 that is welded and fixed to the outer periphery of the catalyst inner case 304 and a thin ring-shaped filter side joint flange 326 that is welded and fixed to the outer periphery of the filter inner case 320 are provided. The catalyst side joining flange 325 and the filter side joining flange 326 are formed in a donut shape having a substantially L-shaped cross section.

  The inner peripheral side of the catalyst side joining flange 325 is fixed by welding to the end portion of the downstream side cylindrical portion 304b in the catalyst inner case 304. The outer peripheral side of the catalyst side joining flange 325 is projected toward the outer peripheral side (radial direction) of the catalyst outer case 305. A bent corner portion of the catalyst side joining flange 325 is a stepped step portion 325a. An end portion on the exhaust gas downstream side of the catalyst outer case 305 is welded and fixed to a step portion 325 a of the catalyst side joining flange 325.

  On the other hand, the inner peripheral side of the filter-side joining flange 326 is fixed by welding to a midway portion in the longitudinal direction (a midway portion in the exhaust gas movement direction) of the outer periphery of the filter inner case 320. The outer peripheral side of the filter side joint flange 326 is projected toward the outer peripheral side (radial direction) of the filter outer case 321. The bent corners of the filter-side joining flange 326 are also stepped steps 326a. An end portion on the upstream side of the exhaust gas in the filter outer case 321 is fixed by welding to a step portion 326 a of the filter side joining flange 326. The filter inner case 320 is formed in a cylindrical shape with a ridge line being straight. The exhaust gas upstream end portion and the exhaust gas downstream end portion of the filter inner case 320 are substantially the same diameter cylinder and are integrally formed.

  The catalyst side joining flange 325 and the filter side joining flange 326 that are abutted via the gasket 324 are disposed in the direction of exhaust gas movement by a pair of thick plate-shaped central sandwiching flanges 351 and 352 that surround the outer peripheral sides of the outer cases 305 and 321. The bolt is fastened in a state of being sandwiched from both sides. That is, the center clamping flanges 351 and 352 are fastened with the bolts 327 and the nuts 328, and the center clamping flanges 351 and 352 clamp the joint flanges 325 and 326, so that the catalyst outer case 305 and the filter outer case 321 Are detachably connected.

  In the state in which the exhaust gas upstream end of the filter outer case 321 is connected to the exhaust gas downstream end of the catalyst outer case 305 via the center clamping flanges 351 and 352 and the joint flanges 325 and 326. A catalyst downstream space 329 is formed between the diesel oxidation catalyst 39 and the soot filter 40. That is, the gas outflow side end surface 39b of the diesel oxidation catalyst 39 and the intake side end surface 40a of the soot filter 40 (filter inner case 320) face each other with a distance L2 for sensor attachment.

  In 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 side end surface (intake side end surface 40 a). 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.

  The silencer 41 for attenuating the exhaust gas sound discharged from the diesel engine 1 includes a substantially cylindrical silencer inner case 331 made of a heat resistant metal material, a substantially cylindrical silencer outer case 332 made of a heat resistant metal material, and a silencer. The outer case 332 has a disc-shaped sound deadening outer lid 333 fixed to the side end portion of the exhaust gas downstream side by welding. A silencer inner case 331 is provided in the silencer outer case 332. The muffler outer case 332 together with the catalyst outer case 305 and the filter outer case 231 constitutes the exhaust gas purification case 38 described above.

  A disk-shaped sound deadening inner lid 336 is fixed to the end of the sound deadening inner case 331 on the upstream side of the exhaust gas by welding. In the muffler inner case 331, a pair of exhaust gas introduction pipes 338 extending in parallel with the exhaust gas movement direction is provided. The exhaust gas upstream side of each exhaust gas introduction pipe 38 penetrates the silencing inner lid 336, but the exhaust gas upstream end of each exhaust gas introduction pipe 338 and the exhaust gas upstream side of the silencing inner case 331. The position with the end portion substantially coincides with the side sectional view. The exhaust gas upstream end of each exhaust gas introduction pipe 338 is opened as it is. A number of communication holes 339 are formed in each exhaust gas introduction pipe 338. Each exhaust gas introduction pipe 338 communicates with the expansion chamber 345 through a communication hole 339. The expansion chamber 345 is formed inside the silencer inner case 331 (between the silencer inner lid 336 and the silencer outer lid 333).

  Exhaust gas outlet pipes 334 disposed between the exhaust gas introduction pipes 338 are passed through the silencer outer lid body 333 of the silencer outer case 332. The exhaust gas upstream side of the exhaust gas outlet pipe 334 is closed by a silencer inner lid body 336. A number of exhaust holes 346 are formed in the exhaust gas outlet pipe 334 at locations in the silencer inner case 331. Each exhaust gas introduction pipe 338 communicates with the exhaust gas outlet pipe 334 via a large number of communication holes 339, an expansion chamber 345, and a large number of exhaust holes 46. A tail pipe (not shown) is connected to the other end side of the exhaust gas outlet pipe 334. In the above configuration, the exhaust gas that has entered the both exhaust gas introduction pipes 338 of the silencer inner case 331 passes through the exhaust gas outlet pipe 334 via the plurality of communication holes 339, the expansion chamber 345, and the numerous exhaust holes 346. Then, the sound is discharged out of the silencer 41 through the tail pipe.

  An inner diameter side of a thin plate-like ring-shaped filter outlet side joining flange 340 is fixed by welding to an end of the filter inner case 320 on the exhaust gas downstream side. The outer diameter side of the filter outlet side joining flange 340 is projected toward the outer peripheral side (radius outside, radial direction) of the filter outer case 321. The end of the filter outer case 321 on the downstream side of the exhaust gas is welded and fixed to the outer peripheral side of the filter outlet side joining flange 340. At the end of the silencer inner case 331 on the upstream side of the exhaust gas, a thin plate-like silencer side flange 341 that protrudes to the outer peripheral side (radius outside) of the silencer outer case 332 is fixed by welding. The exhaust gas upstream end portion of the silencer outer case 332 is welded and fixed to the outer peripheral side of the silencer side joining flange 341.

Exhaust gas movement is performed by a pair of thick plate-like outlet pinching flanges 353 and 354 in which the filter outlet side joining flange 340 and the muffler side joining flange 341 faced through the gasket 324 surround the outer peripheral sides of the outer cases 321 and 332. Bolts are fastened while sandwiched from both sides in the direction. That is, the outlet pinching flanges 353 and 354 are fastened by the bolts 342 and the nuts 343, and the outlet pinching flanges 353 and 354 pinch the joint flanges 340 and 31, respectively. Are detachably connected.

  The silencer 41 configured as described above is configured such that the end portion on the exhaust gas upstream side of the silencer inner case 331 protrudes from the end portion (joining flange 341) on the exhaust gas upstream side of the silencer outer case 332. . In other words, in a state where the silencer outer case 332 is connected to the filter outer case 321, the end of the silencer inner case 331 on the exhaust gas upstream side is the end of the filter outer case 321 on the exhaust gas downstream side (filter outlet side joining flange 340. ) Is inserted into the filter downstream space 349 formed in the inside.

  If comprised as mentioned above, the length of the exhaust gas movement direction of the silencer 41 (silencer outer case 332) can be shortened while ensuring the length of each exhaust gas introduction pipe 338 in the exhaust gas movement direction. Therefore, in the exhaust gas purification apparatus 2 provided with the silencer 41, both the exhaust gas purification apparatus 2 as a whole can be made compact and the silencer 41 can be maintained and improved.

  Further, the configurations of the upstream gas temperature sensor 42 and the downstream gas temperature sensor installed in the exhaust gas purification device 2 will be described below. One end side of the cylindrical sensor boss body 49 is welded and fixed between the upstream side cylinder part 304a and the downstream side cylinder part 304b on the outer peripheral surface of the catalyst inner case 304. The other end side of the sensor boss body 49 is extended in the radial direction from the sensor mounting opening of the catalyst outer case 305 toward the outside of the catalyst outer case 305. That is, the sensor boss body 49 for supporting the exhaust gas sensor penetrates the catalyst outer case 305 in the vicinity of the connection boundary position (catalyst downstream space 329) between the diesel oxidation catalyst 39 and the soot filter 40 on the outer peripheral surface of the catalyst inner case 304. It is provided to do.

  Then, the sensor mounting bolt 63 is screwed to the other end side of the sensor boss body 49. For example, a thermistor type upstream gas temperature sensor 42 is passed through the sensor mounting bolt 63, and the upstream gas temperature sensor 49 is supported by the sensor boss body 49 via the sensor mounting bolt 63. A detection portion of the upstream gas temperature sensor 42 is inserted into the catalyst downstream space 329. In the above configuration, when exhaust gas is discharged from the gas outflow side end face 39 b of the diesel oxidation catalyst 39, the exhaust gas temperature is detected by the upstream gas temperature sensor 42.

  The sensor boss body 49 on the exhaust gas upstream side is an extension of the gas outflow side end surface 39b orthogonal to the exhaust gas movement direction in the diesel oxidation catalyst 39 and the intake side end surface 40a orthogonal to the exhaust gas movement direction in the soot filter 40. Located on the extension. In this case, it is possible to set (close) the arrangement interval between the gas outlet side end surface 39b of the diesel oxidation catalyst 39 and the intake side end surface 40a of the soot filter 40 and the upstream gas temperature sensor 42. The exhaust gas purification device 2 as a whole can be made compact, and the detection accuracy of the upstream gas temperature sensor 42 can be improved. This contributes to performance improvements such as regeneration control for the exhaust gas purification device 2.

  One end side of the cylindrical sensor boss body 50 is also welded and fixed to the vicinity of the filter downstream space 349 on the outer peripheral surface of the filter inner case 320. The other end side of the sensor boss body 50 is extended in the radial direction from the sensor mounting opening of the filter outer case 21 toward the outside of the filter outer case 321. That is, the sensor boss body 50 for supporting the exhaust gas sensor is provided in the vicinity of the connection boundary position of the soot filter 40 on the outer peripheral surface of the filter inner case 320 so as to penetrate the filter outer case 321. A sensor mounting bolt 64 is screwed to the other end side of the sensor boss body 50.

  Then, for example, the thermistor type downstream gas temperature sensor 43 is passed through the sensor mounting bolt 64, and the downstream gas temperature sensor 43 is supported by the sensor boss body 50 via the sensor mounting bolt 64. A detection portion of the downstream gas temperature sensor 43 is inserted into the filter downstream space 349. In the above configuration, when exhaust gas is discharged from the discharge side end face 40 b of the soot filter 40, the exhaust gas temperature is detected by the downstream gas temperature sensor 43. Although details are not shown, it goes without saying that a sensor boss body of a differential pressure sensor can be constructed in the same manner as the sensor boss bodies 49 and 50 for both gas temperature sensors 42 and 43.

Next, a structure in which the diesel engine 1 is mounted on the forklift car 120 will be described with reference to FIGS. 11 and 12. As shown in FIGS. 11 and 12, 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 diesel 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 diesel engine 1, etc., 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 the forklift car 120, the diesel engine 1 is disposed below the control seat 128, and the exhaust gas purification device 2 is disposed on the right side upper side of the diesel engine 1. And the radiator 24 is arrange | positioned in the position facing the cooling fan 9 in the back of the diesel engine 1, and the air cleaner 32 is arrange | positioned in the back left side of the diesel engine 1. FIG. That is, the air cleaner 32 is disposed at a position opposite to the exhaust gas purification device 2 with the diesel engine 1 interposed therebetween.

  The diesel engine 1 is arranged such that the flywheel housing 10 is located on the front side of the traveling machine body 124. That is, the diesel engine 1 is arranged such that the direction of the engine output shaft 74 is along the front-rear direction in which the working unit 127 and the counterweight 131 are aligned. 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 hydraulic drive source 133 of the front wheel 122, the rear wheel 123, and 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 5 Cylinder head 7 Exhaust manifold 24 Radiator 25 Oil cooler 32 Air cleaner 80 Flange side bracket leg (1st bracket leg)
81 Casing side bracket leg (second bracket leg)

Claims (5)

An engine device mounted on a work machine in which a control seat is disposed on a bonnet provided at a rear portion of a traveling machine body and an engine is disposed in the bonnet,
The work machine has a heat exchanger provided at a position facing a cooling fan provided in the engine behind the engine, and the heat exchanger bridges between the left and right side walls of the body frame of the traveling machine body. Supported by a supporting member
The exhaust manifold is provided on one side of the left and right sides of the engine and has an exhaust gas outlet on the upper side, and is supported above the exhaust manifold, and an exhaust gas inlet side is connected to the exhaust gas outlet side of the exhaust manifold, An exhaust gas purification device for purifying the exhaust gas of the engine,
The exhaust gas purification device is disposed between the engine head cover and one of the left and right inner surfaces of the bonnet in parallel to the left and right side surfaces of the engine,
In the engine, an air cleaner is connected to an intake port facing the other of the left and right inner side surfaces of the bonnet via an intake pipe extending toward the rear of the engine,
While a part of the exhaust gas purification device is disposed above the upper end of the support member, the air cleaner is disposed below the upper end of the support member,
The air cleaner is located on the opposite side of the exhaust gas purification device and behind the engine with the engine in between.
Engine equipment.   The engine apparatus according to claim 1, wherein the exhaust gas purifying device is supported by a support body connected to a cylinder head of the engine. The support is a first bracket leg fixed on the cooling fan side of the engine and a second bracket leg fixed on the flywheel housing side of the engine,
The first bracket leg supports the upstream side in the exhaust gas movement direction in the exhaust gas purification apparatus, and the second bracket leg supports the downstream side in the exhaust gas movement direction in the exhaust gas purification apparatus. The engine device according to claim 2.   The engine device according to claim 3, wherein the exhaust gas purifying device is connected to the exhaust manifold at a position between the first bracket leg and the second bracket leg. The exhaust gas purification device communicates with a gas purification body that purifies the exhaust gas exhausted by the engine, a purification casing that houses the gas purification body, an exhaust gas inlet of the purification casing, and an exhaust gas of the exhaust manifold An exhaust gas inlet pipe connected to the gas outlet side, and an exhaust gas outlet pipe communicating with the exhaust gas outlet of the purification casing,
A portion of the pipe wall of the exhaust gas inlet pipe that extends along the purification casing approaches the outer surface of the purification casing as it goes from the exhaust gas inlet side to the exhaust gas outlet side of the exhaust gas inlet pipe. The engine device according to any one of claims 1 to 4, wherein the engine device is inclined to the angle.

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