JP6534790B2 - Engine device of work vehicle - Google Patents

Description

  The present invention relates to an engine device such as a diesel engine mounted on an agricultural machine (tractor, combine) or a construction machine (bulldozer, hydraulic shovel, loader) or the like, and more specifically, to particulate matter contained in exhaust gas ( The present invention relates to an engine device of a working vehicle equipped with an exhaust gas purification device for removing soot, particulates, nitrogen oxides (NOx) and the like contained in exhaust gas.

  In work vehicles such as tractors or wheel loaders, an open / close fulcrum shaft is arranged at the rear of the bonnet for covering the engine to streamline maintenance work of the engine arranged at the front of the traveling machine body, The bonnet was turning. Also, conventionally, a case where a diesel particulate filter is internally installed as an exhaust gas purification device (exhaust gas post-treatment device) in an exhaust passage of a diesel engine (hereinafter referred to as a DPF case), and a urea selective reduction type catalyst A technology is known in which an internally installed case (hereinafter referred to as an SCR case) is provided and exhaust gas is introduced into the DPF case and the SCR case to purify the exhaust gas discharged from the diesel engine (for example, Patent Document 1) ~ 4).

JP, 2009-74420, A JP, 2012-21505, A JP 2013-104394 JP 2012-177233 A

  As in Patent Documents 1 to 3, when assembling the DPF case and the SCR case by separating them from the engine, the temperature of the exhaust gas supplied from the engine to the DPF case or the SCR case decreases, and the diesel particulate filter There is a problem that a special device for maintaining the temperature of the exhaust gas in the SCR case at a high temperature is required since chemical reactions such as regeneration or selective catalytic reduction tend to be incomplete. Also, as in Patent Document 3, there is also a technology in which the DPF case and the SCR case are attached to two parallel base frames, the two base frames are fastened to the installation object, and the DPF case and the SCR case are attached. It is necessary to form the mounting surface of the installation object horizontally (flat), and it is difficult to support the supporting posture of the DPF case and the SCR case in a predetermined posture due to processing errors of mounting parts such as a base frame. There is. Furthermore, when cleaning or replacing the diesel particulate filter (soot filter) in the DPF case, it is necessary to remove the entire DPF case and then disassemble the DPF case to remove the diesel particulate filter. There is a problem that the number of cleaning steps of the printer can not be easily reduced.

  On the other hand, when assembling the DPF case and the SCR case close to the engine as in Patent Document 4, the temperature decrease of the exhaust gas supplied from the engine to the SCR case is reduced, and the temperature of the exhaust gas in the SCR case is reduced. It is easy to maintain the temperature of the engine at high temperature, but it is necessary to secure the installation space for the SCR case on the side of the engine, making it difficult to make the engine room compact and not supporting the DPF case or SCR case compactly There is. Further, in the narrow engine room, there is also a problem that the assembling workability or the maintenance workability of the DPF case or the SCR case can not be improved.

  Then, this invention tries to provide the engine apparatus of the working vehicle which examined and improved these present conditions.

In order to achieve the above object, an engine device of a working vehicle according to the present invention includes a first case for removing particulate matter in exhaust gas of the engine, and a second case for removing nitrogen oxide in exhaust gas of the engine. An engine device of a working vehicle having the first case connected to the second case via a urea mixing tube, the first case, the second case, and the urea mixing tube being arranged in parallel, The first case is formed separately by the exhaust intake side case and the exhaust discharge side case, the oxidation catalyst is internally provided in the exhaust intake side case, and the soot filter is internally provided in the inner cylinder of the exhaust exhaust side case, The exhaust gas intake side of the inner cylinder of the exhaust gas discharge side case is internally provided in the outer cylinder of the exhaust gas discharge side case, and the inner cylinder of the exhaust gas discharge side case is provided in the exhaust gas intake side case The case flange body of the exhaust intake side case and the case flange body of the outer cylinder of the exhaust discharge side case are detachably fastened so as to be insertable, and the exhaust intake side case and the exhaust discharge side case are An exhaust outlet pipe extends in the exhaust gas moving direction of the first case to the outer cylinder of the exhaust gas discharge side case while being detachably connected, and in a radial direction intersecting the exhaust gas moving direction of the first case An outlet side flange body for extending the exhaust gas outlet side of the exhaust outlet pipe and connecting the urea mixing pipe and the exhaust outlet pipe is an outlet pipe at an exhaust gas outlet end of the exhaust outlet pipe. flange and forms a mixed pipe flanges of exhaust gas inlet side end portion of the urea mixing tube, the outlet flange body, min of the exhaust discharge side case to be separated before Symbol exhaust gas moving direction With the surface of the outlet pipe flange parallel to the moving direction of the exhaust gas, the fastening of the case flange body and the fastening of the outlet pipe flange and the mixing tube flange are released. In the case where the exhaust gas intake side case is supported by the engine side, the exhaust gas exhaust side case and the exhaust gas outlet pipe are configured to be removable.

The engine device of the work vehicle includes a holding body for integrally fixing the first case and the second case, and a support base for mounting the holding body, and a plurality of support legs are provided upright on the upper surface side of the engine. And the support is connected to the exhaust manifold of the engine and the plurality of support legs.

According to the present invention, there is provided a first case for removing particulate matter in the exhaust gas of an engine, and a second case for removing nitrogen oxides in the exhaust gas of the engine, wherein the first case includes a urea mixing tube In the engine device of a working vehicle in which the second case is connected via the first case, the first case is divided into an exhaust intake side case and an exhaust discharge side case, and the exhaust intake side case is supported on the engine side Since the exhaust / discharge side case is configured to be separable in the state, there is no need to remove the entire first case in the maintenance work inside the first case, and the exhaust / discharge side case (first case) The number of detachable parts required for the internal maintenance work can be easily reduced, and the soot filter etc. installed in the exhaust / discharge side case can be easily removed. Etc. can be reduced cleaning steps inside or the soot filter of the serial exhaust discharge side case.

According to the present invention, there is provided a holding body for fixing the exhaust intake side case and the second case, and a holding body for fixing the exhaust discharge side case and the second case, wherein the first case and the second case are each Since the exhaust gas purification unit is formed by integrally fixing by the holding body, the exhaust gas is discharged by removing the holding body fixing the exhaust side case and the second case. You can easily remove the side case. When maintaining the inside of the exhaust / discharge side case, it is not necessary to attach / detach the pinching body which secures the exhaust / intake side case and the second case, and the maintenance inside the exhaust / discharge side case Workability can be improved.

According to the present invention, it comprises: a holding body for integrally fixing the first case and the second case; and a support base for mounting the holding body, and a plurality of support legs are erected on the upper surface side of the engine; Since the support is connected to the exhaust manifold of the engine and the plurality of support legs, the processing error of the support such as the support by adjusting the connecting portion between the support and the support base. Can be absorbed, the installation inclination angle of the support can be easily corrected, the first case and the second case can be easily supported in a predetermined posture, and the support can be separated from the attached components of the engine Support can be made to eliminate mutual interference. The assembling workability for assembling the first case and the second case to the engine can be easily improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a left view of the diesel engine which shows 1st Embodiment. It is the same right view. It is the same front view. It is the same rear view. FIG. It is a front perspective view. It is a rear perspective view. It is a bottom view of an exhaust gas purification unit body. It is the same front perspective exploded view. It is the same rear perspective exploded view. It is the same right side perspective exploded view. It is the left side perspective exploded view. It is a left side view of the tractor carrying a diesel engine. FIG. It is a back sectional view of a support stand of an exhaust gas purification unit object. It is a back sectional view of the support leg part. It is back surface sectional drawing of the case attachment frame body part. It is a rear perspective view which disassembled a part of 1st case. It is attachment or detachment explanatory drawing which disassembled a part of 1st case. It is a side view of a work vehicle carrying a diesel engine. It is a top view of the work vehicle.

  Below, 1st Embodiment which actualized this invention is described based on drawing (FIGS. 1-12). 1 is a left side view where the exhaust manifold 6 of the diesel engine 1 is installed, FIG. 2 is a right side view where the intake manifold 3 of the diesel engine 1 is installed, and FIG. 3 is a view where the cooling fan 24 of the diesel engine 1 is installed. It is a front view. The side where the exhaust manifold 6 is installed is referred to as the left side of the diesel engine 1, the side where the intake manifold 3 is installed is referred to as the right side of the diesel engine 1, and the side where the cooling fan 24 is installed is the diesel engine 1 It is called the front of the The entire structure of the diesel engine 1 will be described with reference to FIGS. 1 to 8.

  As shown in FIGS. 1 to 7, an intake manifold 3 is disposed on one side surface of the cylinder head 2 of the diesel engine 1. The cylinder head 2 is mounted on a cylinder block 5 in which an engine output shaft 4 (crankshaft) and a piston (not shown) are built. An exhaust manifold 6 is disposed on the other side surface of the cylinder head 2. The front end and the rear end of the engine output shaft 4 are made to project from the front and back of the cylinder block 5.

  As shown in FIGS. 1 to 7, the flywheel housing 8 is fixed to the rear surface of the cylinder block 5. A flywheel 9 is provided in the flywheel housing 8. A flywheel 9 is axially supported on the rear end side of the engine output shaft 4. The power of the diesel engine 1 is taken out via the flywheel 9. Further, an oil pan 11 is disposed on the lower surface of the cylinder block 5.

  As shown in FIGS. 2 to 5 and FIG. 7, an exhaust gas recirculation device (EGR) 15 that takes in exhaust gas for recirculation is disposed in the intake manifold 3. An air cleaner 16 (see FIG. 13) is connected to the intake manifold 3. The external air removed and cleaned by the air cleaner 16 is sent to the intake manifold 3 and supplied to each cylinder of the diesel engine 1.

  With the above configuration, part of the exhaust gas discharged from the diesel engine 1 to the exhaust manifold 6 is recirculated from the intake manifold 3 to each cylinder of the diesel engine 1 via the exhaust gas recirculation device 15, The combustion temperature of the diesel engine 1 is lowered, the emission amount of nitrogen oxides (NOx) from the diesel engine 1 is reduced, and the fuel efficiency of the diesel engine 1 is improved.

  A cooling water pump 21 for circulating the cooling water in the cylinder block 5 and the radiator 19 (see FIG. 13) is provided. The cooling water pump 21 is disposed on the cooling fan 24 side of the diesel engine 1. The cooling water pump 21 and the cooling fan 24 are connected to the engine output shaft 4 via a V-belt 22 or the like, and the cooling water pump 21 and the cooling fan 24 are driven. The cooling water is fed from the cooling water pump 21 into the cylinder block 5 via the EGR cooler 18 of the exhaust gas recirculation device 15, while the diesel engine 1 is cooled by the cooling fan 24. .

  As shown in FIGS. 1 to 8, a diesel particulate filter for removing particulate matter in the exhaust gas of the diesel engine 1 as an exhaust gas purification device 27 for purifying the exhaust gas discharged from each cylinder of the diesel engine 1 A first case 28 as a curate filter (DPF) and a second case 29 as a urea selective catalytic reduction (SCR) system for removing nitrogen oxides in the exhaust gas of the diesel engine 1 are provided. As shown in FIGS. 1 and 2, an oxidation catalyst 30 and a soot filter 31 are provided in the first case 28 as a DPF case. In the second case 29 as the SCR case, an SCR catalyst 32 for reducing the urea selective catalyst and an oxidation catalyst 33 are provided.

  The exhaust gas discharged from each cylinder of the diesel engine 1 to the exhaust manifold 6 is discharged to the outside via the exhaust gas purification device 27 and the like. The exhaust gas purifier 27 is configured to reduce carbon monoxide (CO), hydrocarbons (HC), particulate matter (PM), and nitrogen oxides (NOx) in the exhaust gas of the diesel engine 1 doing.

  The first case 28 and the second case 29 are formed in an elongated cylindrical shape elongated in the orthogonal direction orthogonal to the output shaft (crankshaft) 4 of the diesel engine 1 in plan view (see FIGS. 3 to 5) ). A DPF inlet pipe 34 for introducing exhaust gas and a DPF outlet pipe 35 for exhausting exhaust gas are provided on both sides of the cylindrical shape of the first case 28 (the one end side and the other end side in the exhaust gas moving direction). Similarly, an SCR inlet pipe 36 for taking in the exhaust gas and an SCR outlet pipe 37 for discharging the exhaust gas are provided on both sides of the second case 29 (the same end side as the one end side in the exhaust gas moving direction).

  Further, at the exhaust gas outlet of the exhaust manifold 6, a supercharger 38 for forcibly feeding air to the diesel engine 1 and an exhaust gas outlet pipe 7 for bolting to the exhaust manifold 6 are disposed. The DPF inlet pipe 34 is communicated with the exhaust manifold 6 via the supercharger 38 and the exhaust gas outlet pipe 7 to introduce the exhaust gas of the diesel engine 1 into the first case 28, while the urea mixing pipe 39 is used. The SCR inlet pipe 36 is connected to the DPF outlet pipe 35, and the exhaust gas of the first case 28 is introduced into the second case 29. In addition, the DPF outlet pipe 35 and the urea mixing pipe 39 are detachably connected by the DPF outlet side flange body 41 to be bolted. The SCR inlet pipe 36 and the urea mixing pipe 39 are detachably connected by the SCR inlet side flange body 40.

  As shown in FIG. 2, a fuel pump 42 and a common rail 43 are provided to connect a fuel tank 45 shown in FIG. 13 (FIG. 14) to each injector (not shown) of multiple cylinders of the diesel engine 1. The common rail 43 and the fuel filter 44 are disposed on the intake manifold 3 side of the cylinder head 2, and the fuel pump 42 is disposed on the cylinder block 5 below the intake manifold 3. Each of the injectors has an electromagnetic switching control type fuel injection valve (not shown).

  The fuel in the fuel tank 45 is sucked into the fuel pump 42 through the fuel filter 44, while the common rail 43 is connected to the discharge side of the fuel pump 42, and the cylindrical common rail 43 is connected to each injector of the diesel engine 1 It is done. The surplus of the fuel pressure-fed from the fuel pump 42 to the common rail 43 is returned to the fuel tank 45, the high pressure fuel is temporarily stored in the common rail 43, and the high pressure fuel in the common rail 43 is each of the diesel engine 1 It is supplied to the inside of a cylinder.

  With the above configuration, the fuel of the fuel tank 45 is pressure-fed to the common rail 43 by the fuel pump 42, high-pressure fuel is stored in the common rail 43, and the fuel injection valve of each injector is controlled to open and close. The high pressure fuel in 43 is injected into each cylinder of the diesel engine 1. That is, by electronically controlling the fuel injection valve of each of the injectors, it is possible to control the injection pressure, injection timing and injection period (injection amount) of the fuel with high accuracy. Therefore, nitrogen oxides (NOx) discharged from the diesel engine 1 can be reduced.

  Next, a tractor 51 mounted with the diesel engine 1 will be described with reference to FIGS. 13 to 14. A tractor 51 as a work vehicle shown in FIGS. 13 to 14 is configured to be equipped with a cultivating work machine (not shown) and the like to perform a cultivating operation and the like for cultivating a field. FIG. 13 is a side view of the agricultural tractor, and FIG. 14 is a plan view thereof. In the following description, the left side is simply referred to as the left side in the forward direction of the tractor, and the right side is simply referred to as the right side in the forward direction.

  As shown in FIG. 13 to FIG. 14, the tractor 51 for agricultural work as a work vehicle supports the traveling machine body 52 by a pair of left and right front wheels 53 and a pair of left and right rear wheels 54. The engine 1 is mounted, and by driving the rear wheels 54 and the front wheels 53 by the diesel engine 1, the vehicle is configured to travel forward and backward. The upper surface side and the left and right side surfaces of the diesel engine 1 are covered with an openable / closable bonnet 56.

  In addition, a cabin 57 on which an operator rides is installed at the rear of the bonnet 56 in the upper surface of the traveling machine body 52. Inside the cabin 57, there are provided control devices such as a control seat 58 on which an operator is seated and a control handle 59 as a control means. The left and right outer portions of the cabin 57 are provided with a pair of left and right steps 60 for the operator to get on and off. Inside the step 60 and below the bottom of the cabin 57, fuel is supplied to the diesel engine 1 A fuel tank 45 for supplying fuel is provided.

  Further, the traveling body 52 is provided with a transmission case 61 for shifting the output from the diesel engine 1 and transmitting it to the rear wheel 54 (front wheel 53). A tilling work machine (not shown) or the like is connected to the rear of the transmission case 61 via a lower link 62, a top link 63, a lift arm 64 and the like so as to be capable of moving up and down. Further, on the rear side of the transmission case 61, a PTO shaft 65 for driving the cultivating work machine etc. is provided. The traveling body 52 of the tractor 51 is constituted by the diesel engine 1, a transmission case 61, a clutch case 66 connecting them, and the like.

  Further, the mounting structure of the first case 28 and the second case 29 will be described with reference to FIGS. 1 to 12 and 15 to 17. As shown in FIG. 9 to FIG. 12 and FIG. 15 to FIG. 17, a front support leg 82 for fastening the lower end to the right corner of the front surface of the cylinder head 2 with a bolt 81; A side support leg 84 for fastening a lower end side bolt 83 to a corner portion and a rear support leg 86 for fastening a lower end side bolt 85 to a rear surface of the cylinder head 2 are provided to the cylinder head 2. Set up. A rectangular support base 87 formed by sheet metal processing is provided, and the side and upper surface sides of the support base 87 are fastened to the upper end sides of the respective leg members 82, 84 and 86 by bolts 88. In addition, a flat plate-like positioning body 89 is fixed by welding to the upper surface of the support table 87 opposite to the exhaust gas outlet pipe 7, and a part of the flat exhaust gas outlet surface 7 a of the exhaust gas outlet pipe 7 is opened upward. A part of the flat lower surface of the positioning body 89 is brought into surface contact, and the positioning body 89 is fastened to the exhaust gas outlet pipe 7 with the positioning bolt 90. The top surface of the support 87 is substantially horizontal to the diesel engine 1 by surface contact of the positioning body 89 with the exhaust gas outlet pipe 7.

  As shown in FIG. 11 to FIG. 12 and FIG. 15 to FIG. 17, a pair of left case fixing body 95 and right case fixing body 96 and four as a holding body for arranging the first case 28 and the second case 29 in parallel. The fastening band 97 is provided. The first case 28 is fixed to the rear side mounting portion of the left case fixing body 95 and the right case fixing body 96 by the left and right fastening bands 97 and the front side placing portion of the left case fixing body 95 and the right case fixing body 96 The second case 29 is fixed by the left and right fastening bands 97. Therefore, the first case 28 and the second case 29, which are long in the left-right direction, are disposed in parallel with the upper surface side of the diesel engine 1, and the first case 28 is disposed behind the upper surface of the diesel engine 1. The second case 29 is located on the front side of the upper surface of the diesel engine 1.

  As shown in FIGS. 9 to 12 and 17, front and rear support frame bodies 98 are attached to front and rear end portions of the left case fixing body 95 and the right case fixing body 96 by adjustable bolts 99 so as to adjust the mounting position (supporting posture) The fixed bodies 95, 96 and the front and rear support frame body 98 are connected in a square frame shape, and the first case 28 and the second case 29 are fixed thereto via the fastening band 97, and an exhaust gas purification device as an exhaust gas purification unit 27 make up. The inner diameter of the bolt through hole of the support frame 98 is formed larger than the outer diameter of the bolt 99, and the bolt 99 is loosely inserted into the bolt through hole of the support frame 98, thereby fixing the case. When the body 95, 96 and the support frame body 98 are fixed, the bolt 99 is screwed to the case body 95, 96 while supporting the connection posture of the support frame body 98 to the case body 95, 96 in a predetermined posture, The support frame body 98 is configured to be fastened to the case fixing bodies 95 and 96 by bolts 99.

  Further, the left and right suspension members 91 are fastened to the front end side of the left case fixing body 95 and the rear end side of the right case fixing body 96 by bolts 92 to form the square frames of the left and right case fixing bodies 95 and 96 and the front and rear support frame 98 The left and right hanging members 91 are arranged at diagonal positions of Meanwhile, the front and rear temporary fixing bolt bodies 93 are erected on the upper surface of the substantially horizontal support base 87, and the front and rear temporary fixing bolt bodies 93 are arranged at diagonal positions opposite to the diagonal arrangement of the left and right hanging members 91. That is, the hanging members 91 on the left and right and the temporary fixing bolt bodies 93 on the front and rear are distributed and disposed at the apexes of the left and right case fixing bodies 95 and 96 and the square frame of the front and rear support frame 98.

  Next, an assembly procedure for assembling the exhaust gas purification device 27 (exhaust gas purification unit) to the diesel engine 1 will be described. As shown in FIGS. 9 to 12, first, the exhaust gas purification apparatus (exhaust gas purification unit) 27 is assembled, and both ends of the left case fixing body (clamping body) 95 and the right case fixing body (capping body) 96 Then, a pair of support frame bodies 98 made of sheet metal with an L-shaped end face are fastened with bolts 99. When tightening the bolt 99, utilizing the bolt holes of each support frame body 98 and the play of the bolt 99 so that the upper surface height of the left case fixing body 95 and the upper surface height of the right case fixing body 96 become equal. Bolts 99 are tightened while adjusting the connection position of each case fixing body 95, 96 and each supporting frame body 98 to connect each case fixing body 95, 96 and each supporting frame body 98 in a square frame shape.

  Subsequently, the first case 28 and the second case 29 are placed in a predetermined direction (parallel) on the upward concave support portion on the upper surface side of each case fixing body 95, 96, and the DPF outlet side flange body 41 is placed on the DPF outlet pipe 35 In addition to bolting, the other end of the urea mixing tube 39 is bolted to the SCR inlet pipe 36 via the SCR inlet side flange body 40, and the first case 28, the second case 29, and the urea mixing tube 39 are integrated. Combine. Then, two fastening bands 97 are respectively mounted on the upper surface sides of the first case 28 and the second case 29 in a half winding manner, and the lower end sides of the fastening bands 97 are bolted to the case fixing bodies 95 and 96 respectively. While fastening, the hanging members 91 are fastened to the case fixing bodies 95 and 96 by bolts 92, and the assembly of the exhaust gas purification device 27 is completed. When the SCR inlet side flange body 40 is bolted, the sensor bracket 112 is also bolted to the SCR inlet side flange body 40, and the differential pressure sensor 111 is attached to the sensor bracket 112.

  On the other hand, near the final assembly process of the assembly line (engine assembly place) of the diesel engine 1, the cylinder head 2 of the diesel engine 1 whose assembly operation is substantially completed, the front leg 82, the side leg 84 and the rear leg Each lower end side of 86 is tightened with bolts 81, 83, 85, and each leg body 82, 84, 86 is erected on the cylinder head 2. Next, the support base 87 is placed on the upper end side of each leg 82, 84, 86, and the lower surface of the positioning body 89 is in surface contact with the exhaust gas outlet surface 7a of the exhaust gas outlet pipe 7 to make the upper surface of the support pedestal 87 The support 87 is fastened to the support legs 82, 84, 86 with bolts 88 under substantially horizontal support, and the support 87 is fixed to the upper surface side of the diesel engine 1 in a horizontal posture.

  Furthermore, at the work place near the end of the assembly process of the diesel engine 1, the exhaust gas purification device 27 completed as described above is transferred to the cargo handling device (hoist or chain block) (not shown) via the suspension member 91. The suspension 87 is suspended and transported to the upper surface side of the diesel engine 1 assembled with the support 87 as described above, and the front and rear support frame 98 is mounted on the substantially horizontal upper surface of the support 87 via the front and rear temporary fixing bolt bodies 93. Mounted from the upper side, the front and rear support frame body 98 is fastened to the support base 87 with a bolt 100, and the exhaust gas purification device 27 (first case 28 and second case 29) is united on the upper surface side of the diesel engine 1 The assembling work of assembling the exhaust gas purification device 27 to the engine 1 is completed.

  In addition, a urea mixing tube 39 is disposed between the first case 28 and the second case 29 in parallel thereto. The first case 28, the second case 29, and the urea mixing tube 39 are supported via the upper surface of the support table 87 at a position higher than the cooling air path (shroud 101 shown in FIG. 1) of the cooling fan 24. The front side of the mixing tube 39 is closed by the second case 29. The exhaust gas temperature in the urea mixing pipe 39 is lowered by the cooling air of the cooling fan 24 or the like to prevent the urea water supplied into the urea mixing pipe 39 from being crystallized. Further, urea water supplied into the urea mixing pipe 39 is mixed as ammonia into the exhaust gas from the first case 28 to the second case 29.

  As shown in FIGS. 1 to 12, a first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 for removing nitrogen oxides in the exhaust gas of the diesel engine 1 are provided. In an engine device of a working vehicle in which the second case 29 is connected to the first case 28 via the urea mixing pipe 39, the case fixing body 95, 96 for fixing the first case 28 and the second case 29 is provided. A hanging member 91 is fixed to 95 and 96. Therefore, in a state where the respective cases 28, 29 are integrally assembled as the exhaust gas purification device (exhaust gas purification unit) 27 by the case fixing bodies 95, 96, the exhaust via the hanging member 91 to the cargo handling device or the like. The purification unit 27 can be suspended and supported. In the assembling and disassembling operation in which the exhaust gas purification device 27 is attached to and detached from the upper surface side of the diesel engine 1, etc., the exhaust gas purification device 27 which is a heavy part can be easily handled.

  As shown in FIGS. 1 to 12, a urea mixing pipe 39 is connected between the first case 28 and the second case 29, which are integrally fixed by the case fixing bodies 95 and 96, and exhaust as an exhaust purification unit The gas purifier 27 is formed, and a pair of suspending members 91 are disposed to face each other on the outer peripheral side of the diagonal position in plan view among the outer peripheral sides of the exhaust gas purifier 27. Therefore, the exhaust gas purification device 27 can be easily assembled to the diesel engine 1 in the assembly process near the final end of the assembly process of the diesel engine 1, and the diesel engine in maintenance work or repair work of the diesel engine 1 The exhaust gas purification device 27 can be easily removed from 1.

  As shown in FIGS. 1 to 12, the upper surface side of the diesel engine 1 is connected to the lower surface side of the support base 87 via a plurality of leg members 82, 84, 86, and the support base 87 is disposed on the upper surface side of the diesel engine 1. The case fixing bodies 95 and 96 are detachably fixed to the substantially horizontal upper surface side of the support table 87. Therefore, while being able to easily reduce interference with attached components on the upper surface side of the diesel engine 1, etc., the assembling workability of the diesel engine 1 or the maintenance workability of the diesel engine 1 can be easily improved.

  As shown in FIGS. 1 to 12, the cooling fan 24 is provided on one side of the diesel engine 1, and the substantially horizontal upper surface height of the support base 87 is formed higher than the upper height of the cooling fan 24. . Therefore, while the air flow of the cooling fan 24 can be moved to the lower surface side of the support table 87 and the air cooling efficiency of the diesel engine 1 can be properly maintained, the exhaust gas purification device 27 as an exhaust gas purification unit by the air flow of the cooling fan 24 Thus, the exhaust gas purification device 27 can be maintained at a predetermined temperature or higher to improve the exhaust gas purification efficiency.

  As shown in FIGS. 1 to 12, a first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 for removing nitrogen oxides in the exhaust gas of the diesel engine 1 are provided. In an engine device of a working vehicle in which the second case 29 is connected to the first case 28 via the urea mixing pipe 39, the case fixing body 95, 96 and the fastening band 97 in which the first case 28 and the second case 29 are holding members. And the support frame body 98 to form an exhaust gas purification unit 27 and to form an exhaust gas purification unit for the diesel engine through the case fixing bodies 95, 96, the fastening band 97 and the support frame body 98. The gas purifier 27 is configured to be detachably supported. Therefore, the diesel engine 1 and the exhaust gas purification device 27 can be integrally formed in the same vibration structure, and there is no need to vibration-proof connect the exhaust connection portion of the first case 28 and the second case 29 etc. The exhaust gas discharge path in the gas purification device 27 can be configured at low cost. In addition, the exhaust gas purification device 27 is assembled in advance at a place different from the assembly work place of the diesel engine 1, and the exhaust gas purification device 27 can be mounted on the diesel engine 1 near the final step of the assembly work of the diesel engine The assembling workability of 1 can be improved.

  As shown in FIGS. 1 to 12, the support base 87 is fixed substantially horizontally on the upper surface side of the diesel engine 1, and the case fixing bodies 95 and 96 are fixed on the upper surface side of the support base 87 via the support frame 98. The first case 28 and the second case 29 are supported on the upper surface side of the diesel engine 1 via the case fixing bodies 95 and 96 and the fastening band 97 in a sideways posture, and between the first case 28 and the second case 29 The upper surface side is configured to support the urea mixing tube 39. Therefore, the exhaust gas purification device 27 can be easily assembled and disassembled by coupling and separating the support base 87 and the support frame body 98, and the first case 28 and the second case 29 are supported bulkily and compactly on the upper surface side of the diesel engine 1. it can. Further, the mounting interval between the first case 28 and the second case 29 can be maintained constant via the case fixing bodies 95, 96 and the fastening band 97, and exhaust gas piping such as the urea mixing pipe 39 between the respective cases 28, 29 can be maintained. The structure can be simplified.

  As shown in FIGS. 9 to 12, the lower ends of the plurality of leg members 82, 84, 86 are fixed to the outer peripheral surface of the cylinder head 2 of the diesel engine 1, and the upper ends of the plurality of leg members 82, 84, 86 are attached. A substantially horizontal support base 87 is detachably connected, and the exhaust gas purification device 27 is mounted on the upper surface side of the diesel engine 1 via the support base 87. Therefore, the connecting portion between the plurality of leg members 82, 84 and 86 and the support 87 is detached, the support 87 is removed, the upper surface side of the diesel engine 1 is largely opened, and maintenance work etc. on the upper surface side of the diesel engine 1 is simplified. In addition, the support base 87 can be firmly connected to the cylinder head 2 via the plurality of leg members 82, 84, 86, and the exhaust gas purification device 27 can be supported on the upper surface side of the diesel engine 1 with high rigidity.

  As shown in FIGS. 1 to 7, the exhaust gas purification device 27 is supported within the width of the output shaft 4-core line direction of the diesel engine 1 via the support 87, and a direction intersecting the 4 output axis line of the diesel engine 1 The direction of movement of the exhaust gas of the first case 28 or the second case 29 is made to coincide with each other. Therefore, by directing the exhaust gas inlet of the first case 28 to the exhaust manifold 6 side of the diesel engine 1, the exhaust gas purification device is set in such a manner that the exhaust gas outlet of the second case 29 faces the intake manifold 3 side of the diesel engine 1. 27 can be supported. The exhaust gas passage from the exhaust manifold 6 of the diesel engine 1 to the exhaust gas outlet of the second case 29 can be formed in a short length, and the exhaust gas purification device 27 can be compactly mounted on the upper surface side of the diesel engine 1.

  On the other hand, as shown in FIGS. 13 to 14, the tail pipe 78 is erected at the front of the right corner of the cabin 57 among the front of the cabin 57, and the lower end of the tail pipe 78 is extended toward the inside of the bonnet 56. And the lower end side of the tail pipe 78 is connected to the SCR outlet pipe 37 via the bellows tubular flexible pipe 79, and the exhaust gas purified by the second case 29 is discharged from the tail pipe 78 to the upper side of the cabin 57. Be done. The connection of the flexible pipe 79 reduces mechanical vibration transmitted from the diesel engine 1 side to the tail pipe 78 side. Further, in the front of the cabin 57, the urea water tank 71 is installed on the left side of the hood 56 opposite to the right side where the tail pipe 78 is disposed. That is, the tail pipe 78 is disposed on the right side of the rear of the bonnet 56, while the urea water tank 71 is distributed and disposed on the left side of the rear of the bonnet 56. In the structure including the tail pipe 78a fixed to the side of the diesel engine 1 as shown by phantom lines in FIGS. 13 to 14, the tail pipe 78 is integrally connected to the SCR outlet pipe 37 and the flexible pipe 79 is omitted. be able to.

  Further, the urea water tank 71 is mounted on the traveling body 52 (the bottom frame of the cabin 57 or the like) on the left rear side of the bonnet 56. At the lower front of the left side of the cabin 57, the oil inlet 46 of the fuel tank 45 and the water inlet 72 of the urea water tank 71 are provided adjacent to each other. While the tail pipe 78 is disposed on the front of the right side of the cabin 57 where the frequency of getting in and out of the operator is low, the oil inlet 46 and the water inlet 72 are disposed on the front of the left side of the cabin 57 where the frequency of getting on and off the operator is high. The cabin 57 is configured such that the operator can get on and off the control seat 58 from either the left side or the right side.

  Further, as shown in FIGS. 3 to 5 and FIG. 14, the urea water injection pump 73 for pressure-feeding the urea aqueous solution in the urea water tank 71, the electric motor 74 for driving the urea water injection pump 73, and the urea water injection pump 73. And a urea water injection nozzle 76 connected thereto via a urea water injection pipe 75. The urea water injection nozzle 76 is attached to the urea mixing pipe 39 via the injection pedestal 77, and the urea aqueous solution is sprayed from the urea water injection nozzle 76 into the urea mixing pipe 39.

  According to the above configuration, carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 1 are reduced by the oxidation catalyst 30 and the soot filter 31 in the first case 28. Next, the urea water from the urea water injection nozzle 7 is mixed with the exhaust gas from the diesel engine 1 inside the urea mixing pipe 39. Then, the nitrogen oxides (NOx) in the exhaust gas in which urea water is mixed as ammonia is reduced by the SCR catalyst 32 and the oxidation catalyst 33 in the second case 29, and are released from the tail pipe 78 to the outside of the machine. .

  As shown in FIGS. 1 to 12 and 15, a first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 for removing nitrogen oxide substances in the exhaust gas of the diesel engine 1. In the engine device of a working vehicle having the first case 28 and the second case 29 connected to the first case 28 via the urea mixing pipe 39, the leg 82, 84, 86 projecting from the diesel engine 1, the leg 82, A support base 87 fixed to 84 and 86 is provided, and the first case 28 and the second case 29 are attached to the flat surface of the support base 87. Therefore, the support 87 can be easily fixed to the diesel engine 1 via the support members 82, 84, 86 in the retrofitting operation (near the end of the assembly process of the diesel engine 1). The case 28 and the second case 29 can be supported in an appropriate posture, and the attachment / detachment workability of the first case 28 and the second case 29 can be improved.

  As shown in FIG. 1 to FIG. 12, FIG. 15, a plane (positioning member) of the support base 87 on the horizontal surface (exhaust gas outlet surface 7a) of the exhaust gas outlet portion (exhaust gas outlet pipe 7) Make the surface 89 contact the bottom surface) and join the support 87 to the outer surface of the diesel engine 1 via the horizontal surface (exhaust gas outlet surface 7a) outside the diesel engine 1 and the flat surface of the support 87 (the bottom of the positioning body 89). When the support base 87 is fixed to the leg members 82, 84, 86, the upper surface side of the support base 87 is configured to be substantially horizontal. Therefore, while the attachment angle of the support 87 can be easily determined by connecting the exhaust gas outlet pipe 7 (exhaust gas outlet) and the support 87, the support 87 is formed into a highly rigid sheet metal structure. The mounting strength can be easily secured. For example, it is possible to improve the assembling workability and the like in which the mounting angle of the support base 87 is formed horizontally to the diesel engine 1.

  As shown in FIGS. 1 to 12 and 15, the positioning body 89 is integrally fixed to the support base 87, and the opening surface (exhaust gas outlet surface 7a of the exhaust gas outlet portion (exhaust gas outlet pipe 7) of the diesel engine 1 And the support base 87 is joined to the side of the diesel engine 1 via the positioning body 89 so that the upper surface side of the support base 87 is substantially horizontal. Therefore, after the support table 87 is formed by pressing or the like, the support table 87 and the positioning body 89 can be connected by welding or the like, and the lower surface of the positioning body 89 is parallel to the upper surface of the support table 87 with high accuracy. It can be formed to be The upper surface side of the support base 87 can be formed substantially horizontally by surface contact between the diesel engine 1 side and the positioning body 89 without specially preparing the connection jig of the support base 87. Since the positioning body 89 is provided as the connection jig of the support table 87, the attaching and detaching operation of the support table 87 can be easily performed even at a repair place of the diesel engine 1 where the connection jig of the support table 87 is not prepared.

  As shown in FIGS. 1 to 12 and 15, the first case 28 and the second case 29 are integrally configured as an exhaust gas purification unit (exhaust gas purification device 27), and the leg members 82, 84, 86 are provided. The exhaust gas purification unit (exhaust gas purification device 27) is integrally attached to and detached from the flat upper surface side of the support table 87 to which the lower surface side is fixed. Therefore, the respective cases 28, 29 can be attached and detached as a single part, and the assembling and disassembling workability of the respective cases 28, 29 or the maintenance workability of the diesel engine 1 can be improved.

  As shown in FIGS. 1 to 8, a first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 for removing nitrogen oxides in the exhaust gas of the diesel engine 1 are provided. In an engine device of a working vehicle in which the second case 29 is connected to the first case 28 via the urea mixing pipe 39, the diesel engine 1, the first case 28 and the second case 29 are integrally fixed to one another. The first case 28 and the second case 29 are integrally configured to be able to shake. Therefore, the diesel engine 1, the first case 28, and the second case 29 can be configured to have the same vibration structure, and the exhaust passage between the diesel engine 1 and the first case 28 or the exhaust passage between the first case 28 and the second case 29 There is no need to vibration-proof and connect the exhaust gas path structure between the diesel engine 1 and the second case 29 at low cost. That is, since it is not necessary to connect a vibration isolation member such as a bellows-like flexible pipe or a heat resistant rubber hose in the exhaust gas path between the first case 28 and the second case 29, the diesel engine 1 and the second The exhaust gas path structure between the cases 29 can be configured at low cost.

  As shown in FIGS. 1 to 10, a plurality of leg members 82, 84, 86 are erected on the cylinder head 2 of the diesel engine 1, and a support base 87 is connected to the upper end side of the plurality of leg members 82, 84, 86. The first case 28 and the second case 29 are fixed to the upper surface side of the diesel engine 1 via a substantially horizontal support 87. Accordingly, the support 87 can be easily separated from the attached components of the diesel engine 1. Further, the first case 28 and the second case 29 can be integrally attached to the diesel engine 1, and the exhaust gas piping of each case 28, 29 can be simplified. 2 The case 29 can be fixed with high rigidity. In addition, by adjusting the connection between the plurality of leg members 82, 84, 86 and the support 87, processing errors and the like of the attachment parts such as the support 87 can be absorbed, and the attachment inclination angle of the support 87 is easily made. It can be corrected and the first case 28 and the second case 29 can be supported in a predetermined posture. Assemblability of assembling the first case 28 and the second case 29 to the diesel engine 1 can be easily improved.

  As shown in FIGS. 1 to 8, the DPF inlet pipe 34 of the first case 28 is disposed on the side where the exhaust manifold 6 of the diesel engine 1 is installed, and the first axis 28 crosses the output axis of the diesel engine 1. 1) Attach the first case 28 so that the exhaust gas in the case 28 can move, and arrange the second case 29 side by side on the cooling fan 24 installation side of the diesel engine 1 among the sides of the first case 28 ing. Therefore, the first case 28 and the second case 29 can be disposed compactly on the upper surface side of the diesel engine 1 while being compact, while the second case 29 is interposed between the cooling fan 24 and the first case 28 so that the cooling fan can The temperature drop of the first case 28 due to the wind can be reduced. Further, by supporting the urea mixing tube 39 for supplying the exhaust gas from the first case 28 to the second case 29 between the first case 28 and the second case 29, the space between the cooling fan 24 and the urea mixing tube 39 By interposing the second case 29, the temperature drop of the urea mixing tube 39 due to the cooling fan 24 can also be reduced.

  As shown in FIG. 1 to FIG. 8, FIG. 13 and FIG. 14, the working vehicle is provided with the driving cabin 57 behind the hood 56 in which the diesel engine 1 is installed. The urea aqueous solution tank 71 for exhaust gas purification is installed between the two. Therefore, the urea water tank 71 can be heated by the exhaust heat of the diesel engine 1 etc., the temperature of the aqueous urea solution in the urea water tank 71 can be maintained above a predetermined level, and the exhaust gas purification capacity of the second case 29 is It can be prevented from falling. The water supply port 72 of the urea water tank 71 can be disposed close to the operator's getting on / off portion of the driving cabin 57, and the aqueous urea solution can be easily supplied to the urea water tank 71 at the operator's getting on / off location. It is possible to improve the supply workability of the urea aqueous solution.

  1 to 12 and 17, a first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 for removing nitrogen oxide substances in the exhaust gas of the diesel engine 1. In the engine device of a working vehicle having the second case 29 connected to the first case 28 via the urea mixing pipe 39, a plurality of case fixing bodies 95, 96 for fixing the first case 28 and the second case 29 and A support frame 98 for fixing a plurality of case fixing bodies 95, 96, and the case fixing bodies 95, 96 and the support frame 98 are connected so as to be adjustable in mounting angle (mounting position). Since the posture of the exhaust gas inlet 34 of the first case 28 can be adjusted, the first case 28 and the second case 2 of the diesel engine 1 can be adjusted. Of the case fixing body 95, 96 and the support frame 98 when adjusting the assembly into a unit, the DPF inlet as the exhaust gas inlet of the first case 28 to the exhaust gas outlet surface 7a of the diesel engine 1 The connecting surface of the tube 34 can be easily joined. The mounting and positioning operation of the first case 28 and the second case 29 can be simplified. That is, the attachment / detachment workability of the first case 28 and the second case 29 can be improved, and the assembly operation or maintenance operation of the diesel engine 1 can be simplified.

  As shown in FIG. 1 to FIG. 12, while forming the exhaust gas purification device 27 as an exhaust gas purification unit by the respective cases 28, 29, the case fixing bodies 95, 96 and the support frame body 98, the cylinder head of the diesel engine 1 The lower end sides of the plurality of leg members 82, 84, 86 are fixed to the outer side surface of the support frame 2, and the support frame body 98 is connected to the upper end sides of the plurality of leg members 82, 84, 86. Therefore, maintenance work etc. on the upper surface side of the diesel engine 1 can be easily performed by attaching and detaching the exhaust gas purification device 27. The support frame body 98 can be firmly connected to the cylinder head 2 via the plurality of support legs 82, 84, 86, and the exhaust gas purification device 27 can be supported with high rigidity on the upper surface side of the diesel engine 1 etc. Interference with attached components of the diesel engine 1 can be easily reduced.

  As shown in FIGS. 1 to 12, the support 87 is disposed substantially horizontally on the upper surface side of the diesel engine 1 via a plurality of leg members 82, 84 and 86, and the support frame 98 is provided on the upper surface of the support 87. Is fixed. Therefore, in maintenance work or repair work of the diesel engine 1, the first case 28 and the second case 29 can be easily removed from the diesel engine 1, and the maintenance work on the upper surface side of the diesel engine 1 can be simplified.

  As shown in FIG. 1 to FIG. 12 and FIG. 15, a part of the lower surface side of the support table 87 is in surface contact with a part of the exhaust gas outlet surface 7a of the diesel engine 1, and the exhaust gas outlet surface 7a of the diesel engine 1 is used as a reference. The support 87 is fixed to the diesel engine 1 in a horizontal position. Therefore, the support base 87 of high rigidity structure can be configured at low cost by sheet metal processing, and the positioning operation at the time of assembling the support frame body 98 to the upper surface side of the support base 87 can be simplified easily. On the other hand, the support 87 can be easily connected to a predetermined support posture.

  Next, as shown in FIGS. 1, 2 and 5, of the inside of the first case 28, the exhaust gas pressure on the exhaust gas intake side (upstream side) of the soot filter 31 and the exhaust gas on the exhaust gas discharge side (downstream side) A differential pressure sensor 111 is provided to detect a difference from the gas pressure. One end side of the sensor bracket 112 is bolted to the SCR inlet side flange body 40, and the other end side of the sensor bracket 112 is protruded from the SCR inlet side flange body 40 toward the upper surface side of the first case 28 The differential pressure sensor 111 is fixed to the other end of the sensor. The differential pressure sensor 111 is disposed on the upper side of the first case 28 via the sensor bracket 112. The differential pressure sensor 111 is connected to one end sides of a synthetic rubber upstream sensor pipe 113 and a downstream sensor pipe 114, respectively. The other end sides of the upstream and downstream sensor pipes 113 and 114 are connected to the upstream and downstream sides of the soot filter 31 in the first case 28, respectively.

  In addition, an upstream gas temperature sensor 115 that detects the exhaust temperature on the exhaust gas intake side of the diesel oxidation catalyst 30, and a downstream gas temperature sensor 116 that detects the exhaust temperature on the exhaust gas discharge side of the diesel oxidation catalyst 30 The differential pressure sensor 111 detects the difference between the exhaust gas pressure on the inflow side of the soot filter 31 and the exhaust gas pressure on the outflow side of the soot filter 31, and the soot filter 31 The exhaust gas temperature of the diesel oxidation catalyst 30 part on the exhaust gas intake side is detected by each of the temperature sensors 115 and 116. That is, since the residual amount of particulate matter in the exhaust gas collected by the soot filter 31 is proportional to the differential pressure of the exhaust gas, when the amount of particulate matter remaining in the soot filter 31 increases to a predetermined level or more Based on the detection result of the differential pressure sensor 111, soot filter regeneration control (for example, fuel injection control or intake control of the diesel engine 1 for increasing the exhaust gas temperature) for reducing the particulate matter mass of the soot filter 31 is executed.

  Next, the disassembled structure of the first case 28 will be described with reference to FIGS. 18 and 19. As shown in FIGS. 18 and 19, the first case 28 is formed of an exhaust intake side case 121 provided with a DPF inlet pipe 34 and an exhaust discharge side case 122 provided with a DPF outlet pipe 35. The oxidation catalyst 30 is provided in the exhaust intake side case 121, and the soot filter 31 is provided in the inner cylinder 122b of the exhaust discharge case 122, and the exhaust gas intake of the inner cylinder 122b is provided in the outer cylinder 122c of the exhaust discharge case 122. The exhaust gas discharge side of the inner cylinder 122b is configured to protrude from the outer cylinder 122c.

  Further, the exhaust gas discharge side of the inner cylinder 122b is inserted into the exhaust gas intake side case 121 so that the exhaust gas discharge side can be taken out and inserted, and the case flange body 121a of the exhaust gas intake side case 121 and the case flange body 122a of the outer cylinder 122c can be separated And the exhaust intake case 121 and the exhaust discharge case 122 are detachably connected. On the other hand, the DPF outlet pipe 35 as an exhaust outlet pipe is provided in the exhaust / discharge side case 122 (outer cylinder 122c), and the radiation direction intersecting with the exhaust gas moving direction of the first case 28 (orthogonal to the cylinder axis of the first case 28) In the direction, the exhaust gas outlet side of the DPF outlet pipe 35 is extended. Further, the DPF outlet side flange body 41 for connecting the urea mixing tube 39 and the DPF outlet tube 35 has an outlet tube flange 41 a at the exhaust gas outlet side end of the DPF outlet tube 35 and an exhaust gas inlet of the urea mixing tube 39. The outlet pipe flange 41a is positioned outward of the cylindrical outer peripheral surface of the exhaust / discharge side case 122 (outer cylinder 122c) while being formed by the mixing pipe flange 41b at the side end.

  That is, the DPF outlet pipe 35 is extended outside the exhaust gas discharge side case 122 in the direction crossing the exhaust gas movement direction, and the position deviated from the separation locus of the exhaust gas discharge side case 122 separated in the exhaust gas movement direction. The connection portion (DPF outlet side flange body 41) of the urea mixing pipe 39 and the DPF outlet pipe 35 is disposed. The mixing pipe flange 41b is fastened to the outlet pipe flange 41a by a bolt 124, and one end of the urea mixing pipe 39 is connected to the DPF outlet pipe 35, and the urea mixing pipe is connected to the SCR inlet pipe 36 via the SCR inlet side flange body 40. The other end of 39 is connected, and the DPF outlet pipe 35, the urea mixing pipe 39 and the SCR inlet pipe 36 are integrally fixed.

  With the above configuration, when the residual amount of particulate matter in the soot filter 31 (such as the detected value of the differential pressure sensor 111) increases beyond the regeneration control range, the bolt 123 is removed and the case flanges 121a and 122a are removed. When the bolt 124 is removed and the fastening of the outlet pipe flange 41a and the mixing pipe flange 41b is released, the exhaust / discharge side case 122 can be separated from the exhaust intake side case 121. The exhaust discharge side case 122 is separated from the exhaust intake side case 121 in the direction of the cylindrical axial center line (exhaust gas moving direction) of the first case 28, and the inner cylinder 122 b is extracted from the exhaust intake side case 121. Remove and disassemble. Next, the soot filter 31 is taken out from the inner cylinder 122b, and the maintenance work of the first case 28 for artificially removing the particulate matter of the soot filter 31 is performed.

  When the bolt 123 is removed and the fastening of each case flange body 121a, 122a is released, the exhaust intake side case 121 is supported by the exhaust gas outlet pipe 7 via the DPF inlet pipe 34, and the bolt 124 is removed. When the fastening of the outlet pipe flange 41 a and the mixing pipe flange 41 b is released, the urea mixing pipe 39 is supported by the second case 29 via the SCR inlet side flange body 40. Therefore, there is no need to remove only the exhaust discharge side case 122 and remove the exhaust intake side case 121 or the urea mixing pipe 39 etc. in maintenance (filter regeneration) work of the soot filter 31, so the exhaust intake side case 121 or urea mixing pipe Compared to a structure requiring disassembly such as 39, the number of maintenance steps for the soot filter 31 can be reduced.

  As shown in FIGS. 1 to 7, 18 and 19, a first case 28 for removing particulate matter in the exhaust gas of the engine 1 and a second case for removing nitrogen oxides in the exhaust gas of the engine 1 In an engine device of a working vehicle including the first case 28 and the second case 29 connected to the first case 28 through a urea mixing pipe, the first case 28 is divided into an exhaust intake case 121 and an exhaust discharge case 122. In a state where the exhaust intake side case 121 is supported on the engine 1 side, the exhaust discharge side case 122 is configured to be separable. Therefore, there is no need to remove the entire first case 28 in the maintenance work of the inside of the first case 28, and the number of detachable parts necessary for the maintenance work inside the exhaust discharge case 122 (first case) can be easily reduced. The soot filter 31 or the like installed in the discharge side case 122 can be easily removed, and the number of cleaning steps of the inside of the exhaust side case 122 or the soot filter 31 can be reduced.

  As shown in FIG. 1 to FIG. 7, FIG. 18 and FIG. 19, the DPF outlet pipe 35 as an exhaust outlet pipe connecting the urea mixing pipe 39 to the first case 28 is provided. The DPF outlet pipe 35 is extended outside in the direction intersecting the moving direction, and the urea mixing pipe 39 and the DPF outlet pipe 35 are connected at a position deviated from the separation trajectory of the exhaust discharge side case 122 separated in the exhaust gas moving direction. (The DPF outlet side flange body 41) is disposed. Therefore, the exhaust moving direction of the first case 28 is obtained by releasing the fastening bolt or the like at the connection portion of the urea mixing pipe 39 and the DPF outlet pipe 35 and releasing the connection between the exhaust intake side case 121 and the exhaust discharge side case 122. The exhaust side case 122 can be slid easily for separation.

  As shown in FIG. 1 to FIG. 7, FIG. 18 and FIG. 19, case fixing bodies 95 and 96 as fastening members for fixing the exhaust intake side case 121 and the second case 29 and fastening bands 97; The first case 28 and the second case 29 are integrally formed by the case fixing bodies 95 and 96 and the fastening band 97, which are provided with the case fixing bodies 95 and 96 as clamping members for fixing the second case 29 and the fastening band 97. It adheres to this, and it is comprised so that the exhaust gas purification apparatus 27 as an exhaust gas purification unit may be formed. Therefore, the exhaust discharge case 122 can be easily attached and detached by removing the fastening band 97 securing the exhaust discharge case 122 and the second case 29. When maintaining the inside of the exhaust / discharge side case 122, it is not necessary to attach / detach the fastening band 97 securing the exhaust / intake side case 121 and the second case 29; Cleaning) Improving workability.

  As shown in FIGS. 1 and 9 to 12, the case fixing bodies 95 and 96 and the fastening band 97 for integrally fixing the first case 28 and the second case 29 and the case fixing bodies 95 and 96 are provided. A support base 87 is provided, and a plurality of leg members 82, 84, 86 are erected on the upper surface side of the diesel engine 1, and the support base 87 is mounted on the exhaust manifold 6 of the diesel engine 1 and the plurality of leg members 82, 84, 86. Are configured to connect the Therefore, by adjusting the connection between the leg members 82, 84 and 86 and the support 87, processing errors and the like of the attachment parts such as the support 87 can be absorbed, and the attachment inclination angle of the support 87 can be easily corrected. The first case 28 and the second case 29 can be easily supported in a predetermined posture, and the support base 87 can be separated from attached components of the diesel engine 1 so as to support mutual interference. Assemblability of assembling the first case 28 and the second case 29 to the diesel engine 1 can be easily improved.

  Next, with reference to FIGS. 20 and 21, a skid steer loader 151 equipped with the diesel engine 1 will be described. A skid steer loader 151 as a work vehicle shown in FIGS. 20 and 21 is configured to mount a loader device 152 described later and perform a loader operation. The left and right traveling crawlers 154 are attached to the skid steer loader 151. Further, above the traveling crawler portion 54 of the skid steer loader 151, an openable / closable bonnet 155 is disposed. In the bonnet 155, the diesel engine 1 is accommodated. The first case 28 and the second case 29 are fixedly mounted on the upper surface portion of the diesel engine 1 within the bonnet 155.

  The diesel engine 1 is supported by a traveling body 156 provided in a skid steer loader 151 via a vibration isolation member or the like. In front of the bonnet 155, a cabin 157 on which a driver rides is disposed. Inside the cabin 157, a steering handle 158, a driver's seat 159 and the like are provided. Further, a loader work hydraulic pump device 160 driven by the diesel engine 1 and a traveling mission device 161 driving the left and right traveling crawler portions 154 are provided. Power from the diesel engine 1 is transmitted to the left and right traveling crawlers 154 via the traveling mission device 161. The operator seated on the driver's seat 159 can perform traveling operation and the like of the skid steer loader 151 via the operation unit such as the steering handle 158 and the like.

  The loader device 152 includes loader posts 162 disposed on the left and right sides of the traveling body 156, a pair of left and right lift arms 163 pivotally connected to upper ends of the loader posts 162, and left and right lift arms 163. It has the bucket 164 connected with the front-end | tip part so that rocking | fluctuation was possible.

  A lift cylinder 166 for vertically moving the lift arm 163 is provided between each loader post 162 and the corresponding lift arm 163. Between the left and right lift arms 163 and the bucket 164, a bucket cylinder 168 for swinging the bucket 164 up and down is provided. In this case, when the operator of the control seat 159 operates the loader lever (not shown), the hydraulic pressure of the loader work hydraulic pump device 160 is controlled, and the lift cylinder 166 and the bucket cylinder 168 extend and contract. And the bucket 164 is pivoted up and down to perform the loader operation. The urea water tank 71 is provided inside the front side of the bonnet 155. Further, the radiator 19 disposed to face the cooling fan 24 is provided at the rear of the bonnet 155.

1 diesel engine 6 exhaust manifold 27 exhaust gas purification device (exhaust gas purification unit)
28 1st case 29 2nd case 35 DPF outlet pipe (exhaust outlet pipe)
39: Urea mixing tube 82: front leg 84: side leg 86: rear leg 87: support 95: left case fixed body (sandwich)
96 Right case fixed body (sandwich)
97 Fastening band (clamping body)
121 Exhaust intake case 122 Exhaust exhaust case

Claims (2)

A first case for removing particulate matter in the exhaust gas of an engine, and a second case for removing nitrogen oxide material in the exhaust gas of the engine, the first case comprising the second case via a urea mixing pipe In an engine device of a work vehicle to which a case is connected,
Arranging the first case, the second case, and the urea mixing pipe in parallel;
The first case is divided and formed by an exhaust intake side case and an exhaust discharge side case,
An oxidation catalyst is provided in the exhaust intake side case, and a soot filter is provided in the inner cylinder of the exhaust discharge side case, and the exhaust cylinder of the exhaust discharge side case is provided in the exhaust cylinder of the exhaust discharge side case. The gas intake side is internally provided, and the inner cylinder of the exhaust discharge side case is insertably inserted into the exhaust intake side case, and a case flange body of the exhaust intake side case and the outer side of the exhaust discharge side case The casing flange body of the cylinder is detachably fastened, and the exhaust intake side case and the exhaust discharge side case are detachably connected.
An exhaust outlet pipe is extended in the exhaust gas moving direction of the first case to the outer cylinder of the exhaust exhaust side case, and the exhaust of the exhaust outlet pipe is extended in a radial direction intersecting the exhaust gas moving direction of the first case. Along with extending the gas outlet side,
The outlet side flange body for connecting the urea mixing pipe and the exhaust outlet pipe is a mixture of the outlet pipe flange at the exhaust gas outlet side end of the exhaust outlet pipe and the exhaust gas inlet side end of the urea mixing pipe Formed by a pipe flange,
The outlet flange member, at a position away from the separation path of the exhaust discharge side case to be separated before Symbol exhaust gas moving direction, causes disposed,
Making the face of the outlet pipe flange parallel to the exhaust gas moving direction;
When the fastening of the case flange body and the fastening of the outlet pipe flange and the mixing pipe flange are released, the exhaust exhaust side case and the exhaust side case are supported while the exhaust intake side case is supported on the engine side. An engine device for a working vehicle, wherein the exhaust outlet pipe is configured to be removable.   A holding body for integrally fixing the first case and the second case, and a support base for mounting the holding body, and a plurality of support legs are provided upright on the upper surface side of the engine; The engine device of a work vehicle according to claim 1, wherein the support base is connected to a plurality of support legs.

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