JP2015183552A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device which easily secures the support strength of an exhaust emission control unit 27 and enables easy attachment/detachment of the exhaust emission control unit to/from an engine 1.SOLUTION: An engine device includes: a first case 28 which removes particulate substances in an exhaust gas of an engine 1; and a second case 29 which removes nitrogen oxide substances in the exhaust gas of the engine 1. The second case 29 is connected with the first case 28 through a urea mixture pipe 39. The first case 28 and the second case 29 are integrally fastened by support frame bodies 98 to form an exhaust emission control unit 27. An exhaust gas inlet pipe 34 of the first case 28 is connected with an exhaust gas outlet pipe 7 of the engine 1 and the exhaust gas outlet pipe 7 is used as a support member of the exhaust emission control unit 27.

Description

  The present invention relates to an engine device such as a diesel engine mounted on a work vehicle such as an agricultural machine (tractor, combine) or a construction machine (bulldozer, hydraulic excavator, loader), and more specifically, particles contained in exhaust gas. The present invention relates to an engine device equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) or nitrogen oxides (NOx) contained in exhaust gas.

  In a work vehicle such as a tractor or wheel loader, an opening / closing fulcrum shaft is arranged at the rear of the bonnet for covering the engine in order to improve the efficiency of maintenance work of the engine arranged at the front of the traveling machine body. The bonnet was rotated. Conventionally, a soot filter (diesel particulate filter) as an exhaust gas purification device (exhaust gas aftertreatment device) in the exhaust path of a diesel engine (hereinafter referred to as a DPF case) and urea selection There is known a technique for purifying exhaust gas discharged from a diesel engine by providing a case (hereinafter referred to as SCR case) in which a reducing SCR catalyst is installed, introducing exhaust gas into the DPF case and the SCR case. (For example, refer patent documents 1-4).

JP 2009-74420 A JP 2012-21505 A JP2013-104394A JP 2012-177233 A

  When the DPF case and the SCR case are assembled apart from the engine as in Patent Documents 1 to 3, the temperature of the exhaust gas supplied from the engine to the DPF case or the SCR case decreases, and the diesel particulate filter Therefore, 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. Further, as disclosed in Patent Document 3, there is a technique for attaching a DPF case and an SCR case by attaching a DPF case and an SCR case to two parallel base frames and fastening the two base frames to an installation target. It is necessary to form the mounting surface of the installation object horizontally (flat), and it is difficult to support the support posture of the DPF case and the SCR case in a predetermined posture due to processing errors of attachment parts such as the base frame. There is.

  On the other hand, when the DPF case and the SCR case are assembled close to the engine as in Patent Document 4, the temperature drop 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. However, it is difficult to make the engine room compact and the DPF case or the SCR case cannot be supported compactly. There is. Further, in an engine room whose size is restricted, there is a problem that assembly workability or maintenance workability of a DPF case or an SCR case cannot be improved.

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

  In order to achieve the above object, an engine device according to a first aspect of the present invention includes a first case for removing particulate matter in engine exhaust gas, and a second case for removing nitrogen oxides in the engine exhaust gas. In a working vehicle engine device comprising a case and connecting the second case to the first case via a urea mixing tube, the first case and the second case are integrally fixed by the support frame body. In addition, while forming an exhaust purification unit, an exhaust gas inlet pipe of the first case is connected to an exhaust gas outlet pipe of the engine, and the exhaust gas outlet pipe is also used as a support member of the exhaust purification unit.

  According to a second aspect of the present invention, in the engine device according to the first aspect, upper end sides of a plurality of support legs are connected to a lower surface side of a support base that is rectangular in a plan view, and the upper surface side of the engine The support base is disposed via a support leg, and the support frame body is detachably fixed to a substantially horizontal upper surface side of the support base.

  According to a third aspect of the present invention, in the engine device according to the second aspect, the left side surface and the right side surface of a cylinder head front portion having a rectangular shape in a plan view of the engine are arranged in three directions: a rear surface of the cylinder head rear portion. The lower ends of the plurality of support legs are respectively fastened.

  According to a fourth aspect of the present invention, in the engine device according to the second aspect, a part of the support base is extended to the upper surface side of the exhaust gas outlet pipe of the engine that the exhaust gas inlet pipe of the first case abuts. A part of the support base is brought into contact with the upper surface side of the exhaust gas outlet pipe of the engine from above, and the support base is fastened to the exhaust gas outlet pipe.

  According to the first aspect of the present invention, the first case includes a first case for removing particulate matter in the exhaust gas of the engine and a second case for removing nitrogen oxides in the exhaust gas of the engine. In the engine device in which the second case is connected to the second casing via the urea mixing pipe, the first case and the second case are integrally fixed by the support frame body to form an exhaust purification unit, while the engine The exhaust gas inlet pipe of the first case is connected to the exhaust gas outlet pipe, and the exhaust gas outlet pipe is also used as a support member of the exhaust purification unit. The exhaust purification unit is supported by the highly rigid exhaust gas outlet pipe, and the support strength of the exhaust purification unit can be easily ensured. In such maintenance or repair work of the engine, it can be easily detached the exhaust gas purifying unit to the engine.

  According to the second aspect of the present invention, the upper ends of the plurality of support legs are connected to the lower surface side of the rectangular support base in plan view, and the support base is connected to the upper surface side of the engine via the plurality of support legs. And the exhaust purification unit is supported by the plurality of support legs and the exhaust gas outlet pipe, because the support frame body is detachably fixed to the substantially horizontal upper surface side of the support base. While the support strength of the exhaust gas purification unit can be easily secured, the support structure such as the plurality of support legs can be easily simplified. In addition, since the support base can be disposed via the plurality of support legs at a position separated from the outer peripheral surface of the engine, interference with the attached parts of the engine can be reduced, and the assembly workability of the engine can be reduced. In addition to the improvement, the maintenance workability of the engine can be improved.

  According to the third aspect of the present invention, the lower end sides of the plurality of support legs are arranged in three directions, that is, a left side surface and a right side surface of a cylinder head front portion having a rectangular shape in plan view of the engine and a rear surface of the cylinder head rear portion. Since they are fastened, the exhaust purification unit can be supported with the outer peripheral portion of the cylinder head as a fixed portion, and the exhaust purification unit can be assembled to the engine with almost no change on the engine body side. . Further, in an engine assembly factory or the like, the engine can be lifted by a chain block or the like, which also serves as the support leg body as an engine lifting bracket mounting seat, and can be easily moved to a storage place or an assembly place.

  According to the fourth aspect of the present invention, a part of the support base is extended on the upper surface side of the exhaust gas outlet pipe of the engine with which the exhaust gas inlet pipe of the first case abuts, and the exhaust gas of the engine Since a part of the support base is brought into contact with the upper surface side of the outlet pipe from above and the support base is fastened to the exhaust gas outlet pipe, both the exhaust purification unit and the support base are attached. As a reference, the upper surface of the exhaust gas outlet pipe can be formed. That is, since the mounting position (height or levelness, etc.) of the exhaust purification unit or the support base can be determined on the upper surface of the exhaust gas outlet pipe, the exhaust gas outlet pipe (engine) can be determined at an engine assembly plant or the like. After the support base is fastened, the exhaust purification unit can be fastened to the support base. When the exhaust purification unit is installed in the engine, a processing dimension error or the like of the exhaust purification unit or the support base can be easily eliminated, and assembly workability of the exhaust purification unit can be improved.

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. It is the same top view. It is the same front perspective view. It is the same rear perspective view. It is bottom face explanatory drawing of an exhaust-gas purification | cleaning unit body. It is the same front perspective exploded view. FIG. FIG. It is the left perspective exploded view. It is a left view of the tractor carrying a diesel engine. It is the same top view. It is a back sectional view of a support stand part of an exhaust gas purification unit body. It is a back sectional view of the same support leg part. It is a back sectional view of the case attachment frame body part. It is the back perspective view which decomposed | disassembled a part of 1st case. It is attachment / detachment explanatory drawing which decomposed | disassembled a part of 1st case. It is a side view of the work vehicle carrying a diesel engine. It is a top view of the work vehicle. It is a front view of an exhaust gas purification unit body. It is the same rear view. It is the left side view. It is the same right view. It is the same top view. It is the bottom view. It is a top view of a support stand. FIG. It is the left perspective view which looked at the diesel engine upper part from the back side.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 12). 1 is a left side view in which an exhaust manifold 6 of a diesel engine 1 is installed, FIG. 2 is a right side view in which an intake manifold 3 of the diesel engine 1 is installed, and FIG. 3 is a cooling fan 24 of the diesel engine 1 installed. It is a front view. The side on which the exhaust manifold 6 is installed is referred to as the left side of the diesel engine 1, the side on which the intake manifold 3 is installed is referred to as the right side of the diesel engine 1, and the side on which the cooling fan 24 is installed is referred to as the diesel engine 1. It is called the front. The overall structure of the diesel engine 1 will be described with reference to FIGS.

  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 of the cylinder head 2. The front end and the rear end of the engine output shaft 4 are projected from the front and back of the cylinder block 5.

  As shown in FIGS. 1 to 7, a flywheel housing 8 is fixed to the back surface of the cylinder block 5. A flywheel 9 is provided in the flywheel housing 8. A flywheel 9 is pivotally 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 7, the intake manifold 3 is provided with an exhaust gas recirculation device (EGR) 15 that takes in exhaust gas for recirculation. An air cleaner 16 (see FIG. 13) is connected to the intake manifold 3. The external air that has been dedusted and purified 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, a 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 oxide (NOx) from the diesel engine 1 is reduced, and the fuel efficiency of the diesel engine 1 is improved.

  In addition, the cooling water pump 21 which circulates a cooling water in the cylinder block 5 and the radiator 19 (refer FIG. 13) is provided. A cooling water pump 21 is disposed on the side of the diesel engine 1 where the cooling fan 24 is installed. The cooling water pump 21 and the cooling fan 24 are connected to the engine output shaft 4 via the V belt 22 and the like, and the cooling water pump 21 and the cooling fan 24 are driven. While the cooling water is sent from the cooling water pump 21 into the cylinder block 5 via the EGR cooler 18 of the exhaust gas recirculation device 15, the diesel engine 1 is cooled by the cooling fan 24 wind. .

  As shown in FIGS. 1 to 8, as an exhaust gas purification device 27 (exhaust gas purification unit) for purifying exhaust gas discharged from each cylinder of the diesel engine 1, particulate matter in the exhaust gas of the diesel engine 1 is used. A first case 28 as a diesel particulate filter (DPF) that removes nitrogen and a second case 29 as a urea selective catalytic reduction (SCR) system that removes nitrogen oxides in the exhaust gas of the diesel engine 1. 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 urea selective catalyst reduction and an oxidation catalyst 33 are provided.

  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 purification device 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 configured in a long cylindrical shape extending in the orthogonal direction intersecting with the output shaft (crankshaft) 4 of the diesel engine 1 in plan view (see FIGS. 3 to 5). ). A DPF inlet pipe 34 for taking in exhaust gas and a DPF outlet pipe 35 for discharging exhaust gas are provided on both sides of the first case 28 in the cylindrical shape (one end side and the other end side in the exhaust gas movement direction). Similarly, an SCR inlet pipe 36 that takes in exhaust gas and an SCR outlet pipe 37 that discharges exhaust gas are provided on both sides of the second case 29 (one end side and the other end side in the exhaust gas movement direction).

  In addition, a supercharger 38 that forcibly sends air to the diesel engine 1 and an exhaust gas outlet pipe 7 that is bolted to the exhaust manifold 6 are disposed at the exhaust gas outlet of the exhaust manifold 6. 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. An SCR inlet pipe 36 is connected to the DPF outlet pipe 35 so that exhaust gas from 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 a DPF outlet side flange body 41 to be bolted. The SCR inlet pipe 36 and the urea mixing pipe 39 are detachably connected at the SCR inlet side flange body 40.

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

  While the fuel in the fuel tank 45 is sucked into the fuel pump 42 via the fuel filter 44, 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. Has been. The surplus of the fuel pumped from the fuel pump 42 to the common rail 43 is returned to the fuel tank 45, high-pressure fuel is temporarily stored in the common rail 43, and the high-pressure fuel in the common rail 43 is used for each diesel engine 1. Supplied inside the cylinder.

  With the above configuration, the fuel in the fuel tank 45 is pumped to the common rail 43 by the fuel pump 42, the high-pressure fuel is stored in the common rail 43, and the fuel injection valves of the injectors are 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 injector, the fuel injection pressure, injection timing, and injection period (injection amount) can be controlled with high accuracy. Therefore, nitrogen oxides (NOx) discharged from the diesel engine 1 can be reduced.

  Next, the tractor 51 on which the diesel engine 1 is mounted will be described with reference to FIGS. A tractor 51 as a work vehicle shown in FIG. 13 to FIG. 14 is configured to perform a tilling work and the like for plowing a farm field by mounting a tillage working machine (not shown). 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 in the forward direction of the tractor is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side.

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

  Further, a cabin 57 on which an operator is boarded is installed behind the hood 56 in the upper surface of the traveling machine body 52. Inside the cabin 57, a steering seat 58 on which an operator is seated and steering equipment such as a steering handle 59 as steering means are provided. Further, a pair of left and right steps 60 for the operator to get on and off are provided in the left and right outer portions of the cabin 57, and fuel is supplied to the diesel engine 1 inside the step 60 and below the bottom portion of the cabin 57. A fuel tank 45 to be supplied is provided.

  The traveling machine body 52 includes 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 tiller working machine (not shown) is connected to the rear portion of the mission case 61 via a lower link 62, a top link 63, a lift arm 64, and the like so as to be movable up and down. Further, a PTO shaft 65 for driving the tilling work machine and the like is provided on the rear side surface of the mission case 61. The traveling machine body 52 of the tractor 51 includes the diesel engine 1, a transmission case 61, a clutch case 66 that connects them, and the like.

  Furthermore, the mounting structure of the first case 28 and the second case 29 will be described with reference to FIGS. 1 to 12, 15 to 17, and 22 to 27. 9 to 12, 15 to 17, and 22 to 27, the front support leg 82 that fastens the lower end to the bolt 81 at the right corner of the front surface of the cylinder head 2, and the cylinder head 2. Of the left side of the cylinder head 2 is provided with a side support leg body 84 for fastening the lower end side to the bolt 83 and a rear support leg body 86 for fastening the lower end side of the bolt 85 to the rear face of the cylinder head 2. The bodies 82, 84 and 86 are erected. A rectangular support base 87 formed by sheet metal processing is provided, and the side surfaces and the upper surface side of the support base 87 are fastened with bolts 88 to the upper end sides of the support legs 82, 84, 86. Further, a flat plate-like positioning body 89 is welded and fixed to the upper surface of a support base 87 provided to face the exhaust gas outlet pipe 7, and is formed on a part of the flat exhaust gas outlet surface 7a of the exhaust gas outlet pipe 7 opened upward. Then, 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 by positioning bolts 90. The upper surface of the support base 87 is configured to be substantially horizontal with respect to the diesel engine 1 by the surface contact of the positioning body 89 with the exhaust gas outlet pipe 7. When the exhaust gas outlet pipe 7 is assembled into the diesel engine 1 or before the support base 87 is attached, the lower end side of the positioning bolt 90 is screwed to the exhaust gas outlet pipe 7 and positioned upward from the exhaust gas outlet surface 7a. The bolt 90 is erected.

  As shown in FIGS. 11 to 12 and FIGS. 15 to 17, a pair of left case fixing body 95 and right case fixing body 96 are used as a sandwiching 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 mounting portions 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 mounting portions of the left case fixing body 95 and the right case fixing body 96 are fixed. The second case 29 is fixed to the left and right fastening bands 97. Therefore, the cylindrical first case 28 and the second case 29 that are long in the left-right direction are arranged in parallel to the upper surface side of the diesel engine 1, and the first case 28 is disposed on the rear side of 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, the front and rear support frame bodies 98 are fastened to the front and rear ends of the left case fixing body 95 and the right case fixing body 96 by bolts 99 so that the mounting position (supporting posture) can be adjusted. The fixed bodies 95 and 96 and the front and rear support frame bodies 98 are connected in a square frame shape, and the first case 28 and the second case 29 are fixed to each other via a fastening band 97, and the exhaust gas purification device 27 as an exhaust gas purification unit. Is configured. Note that the inner diameter dimension of the bolt through hole of the support frame body 98 is formed larger than the outer diameter dimension of the bolt 99, and the bolt 99 is loosely inserted into the bolt through hole of the support frame body 98. When the bodies 95, 96 and the support frame body 98 are fixed, the bolts 99 are screwed onto the case fixing bodies 95, 96 while supporting the connection posture of the support frame body 98 with respect to the case fixing bodies 95, 96 in a predetermined posture. The support frame body 98 is fastened to the case fixing bodies 95 and 96 with bolts 99.

  In addition, 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 so that the rectangular frames of the left and right case fixing bodies 95 and 96 and the front and rear support frame bodies 98 Left and right hanging members 91 are arranged at the diagonal positions. On the other hand, 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 suspension members 91. That is, the left and right suspension members 91 and the front and rear temporary fixing bolt bodies 93 are arranged separately at the apex corners of the rectangular frames of the left and right case fixing bodies 95 and 96 and the front and rear support frame bodies 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, an exhaust gas purification device 27 as an exhaust purification unit is assembled, and both end portions of a left case fixing body (clamping body) 95 and a right case fixing body (clamping body) 96 are assembled. In addition, a pair of support frame bodies 98 made of sheet metal having an end face L shape are fastened with bolts 99. When tightening the bolt 99, using the bolt hole of each support frame body 98 and the backlash 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 are flush with each other, The bolts 99 are fastened while adjusting the connecting positions of the case fixing bodies 95 and 96 and the support frame bodies 98, and the case fixing bodies 95 and 96 and the support frame bodies 98 are connected 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 attached to the DPF outlet pipe 35. The bolts are fastened and the other end of the urea mixing pipe 39 is bolted to the SCR inlet pipe 36 via the SCR inlet side flange body 40 so that the first case 28, the second case 29, and the urea mixing pipe 39 are integrated. Combine. Then, two fastening bands 97 are respectively attached to the upper surfaces of the first case 28 and the second case 29 in a semi-winding manner, and the lower ends of the fastening bands 97 are bolted to the case fixing bodies 95 and 96, respectively. At the same time, the suspension member 91 is fastened to the case fixing bodies 95 and 96 with the bolt 92, and the assembly of the exhaust gas purifying device 27 is completed. Note that when the bolts of the SCR inlet side flange body 40 are fastened, 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, in the vicinity of the final assembly process of the assembly line (engine assembly place) of the diesel engine 1, the front support leg 82, the side support leg 84, and the rear support leg are attached to the cylinder head 2 of the diesel engine 1 that has been almost completely assembled. Bolts 81, 83, 85 are fastened to the lower ends of 86, and the support legs 82, 84, 86 are erected on the cylinder head 2. Next, the support base 87 is placed on the upper end side of each of the support legs 82, 84, 86, and the lower surface of the positioning body 89 is brought into surface contact with the exhaust gas outlet surface 7 a of the exhaust gas outlet pipe 7. Is supported substantially horizontally, a support base 87 is fastened to each of the support legs 82, 84, 86 with bolts 88, and the support base 87 is fixed to the upper surface side of the diesel engine 1 in a horizontal posture.

  Further, at the work place near the end of the assembly process of the diesel engine 1, the exhaust gas purification device 27 that has been assembled as described above is connected to a cargo handling device (hoist or chain block) (not shown) via the suspension member 91. It is suspended and transported to the upper surface side of the diesel engine 1 to which the support base 87 is assembled as described above, and the front and rear support frame body 98 is mounted on the substantially horizontal upper surface of the support base 87 via the front and rear temporary fixing bolt bodies 93. The front and rear support frame bodies 98 are fastened to the support base 87 with bolts 100, and the exhaust gas purifying device 27 (the first case 28 and the second case 29) is combined with the upper surface side of the diesel engine 1. The assembly work for 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 therewith. The first case 28, the second case 29, and the urea mixing pipe 39 are supported at a position higher than the cooling air passage (the shroud 101 shown in FIG. 1) of the cooling fan 24 via the upper surface of the support base 87, and urea 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 and the like, so that urea water supplied into the urea mixing pipe 39 is prevented from crystallizing. Further, the urea water supplied into the urea mixing pipe 39 is configured to be mixed as ammonia in 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. The engine device for a work vehicle in which the second case 29 is connected to the first case 28 via the urea mixing pipe 39 includes case fixing bodies 95 and 96 for fixing the first case 28 and the second case 29 to each other. A suspension member 91 is fixed to 95 and 96. Accordingly, in a state where the cases 28 and 29 are integrally assembled as the exhaust gas purification device (exhaust purification unit) 27 by the case fixing bodies 95 and 96, the exhaust is performed via the suspension member 91 to the cargo handling device or the like. The gas purification device 27 can be supported by being suspended. In assembly / disassembly work for attaching / detaching the exhaust gas purification device 27 to / from the upper surface side of the diesel engine 1, the exhaust gas purification device 27, which is a heavy component, 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 that are integrally fixed by the case fixing bodies 95 and 96, so that exhaust as an exhaust purification unit is achieved. A gas purification device 27 is formed, and a pair of suspending members 91 are arranged opposite to each other on the outer peripheral side of the diagonal position in plan view among the outer peripheral sides of the exhaust gas purification device 27. Therefore, the exhaust gas purification device 27 can be easily assembled to the diesel engine 1 in the assembly process near the end of the assembly process of the diesel engine 1, and the diesel engine 1 can be used for maintenance work or repair work of the diesel engine 1. 1 can easily remove the exhaust gas purification device 27.

  As shown in FIGS. 1 to 12, the diesel engine 1 is connected to the lower surface side of the support base 87 via a plurality of support legs 82, 84, 86 on the upper surface side, 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 base 87. Therefore, the assembly workability of the diesel engine 1 or the maintenance workability of the diesel engine 1 can be easily improved while the interference with the attached parts on the upper surface side of the diesel engine 1 can be easily reduced. On the other hand, as shown in FIGS. 7 to 12 and 15 to 17, a vent 87 a is formed in the support 87 on the lower surface side of the first case 28 or the second case 29, and a plurality of support legs 82, 84, 86 are formed. Since the air passage 94 is formed between the diesel engine 1 and each of the cases 28 and 29 by the air vent 87a, the upper surface side of the diesel engine 1 facing the lower surface side of the first case 28 or the second case 29. It is possible to easily suppress an increase in the temperature of the outer peripheral portion of the engine, and it is possible to improve the durability of attached parts (such as a sensor harness) on the upper surface side of the diesel engine 1.

  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 higher than the upper height of the cooling fan 24. . Therefore, while the cooling fan 24 wind is moved to the lower surface side of the support base 87 and the air cooling efficiency of the diesel engine 1 can be properly maintained, the exhaust gas purification device 27 as the exhaust gas purification unit 27 with the cooling fan 24 wind. 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 for a work vehicle in which the second case 29 is connected to the first case 28 via the urea mixing tube 39, case fixing bodies 95 and 96 and a fastening band 97 as a sandwiching body between the first case 28 and the second case 29. In addition, the exhaust gas purification device 27 is formed by being integrally fixed by the support frame body 98, and the diesel engine is provided as an exhaust purification unit via the case fixing bodies 95 and 96, the fastening band 97, and the support frame body 98. The exhaust gas purification device 27 is configured to be detachably supported. Therefore, the diesel engine 1 and the exhaust gas purifying device 27 can be integrally configured in the same vibration structure, and it is not necessary to connect the exhaust connection portion of the first case 28 and the second case 29 in a vibration-proof manner. The exhaust gas discharge path in the gas purification device 27 can be configured at low cost. Further, the exhaust gas purification device 27 can be 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 placed on the diesel engine 1 in the vicinity of the final process of the assembly work of the diesel engine 1. The assembly workability of 1 can be improved.

  As shown in FIGS. 1 to 12, a support base 87 is fixed substantially horizontally to the upper surface side of the diesel engine 1, and case fixing bodies 95 and 96 are fixed to the upper surface side of the support base 87 via a support frame body 98, The first case 28 and the second case 29 are laid sideways on the upper surface side of the diesel engine 1 via case fixing bodies 95 and 96 and a fastening band 97, and between the first case 28 and the second case 29, The urea mixing tube 39 is supported on the upper surface side. 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 in a compact and compact manner 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 and 96 and the fastening band 97, and an exhaust gas pipe such as a urea mixing pipe 39 between the cases 28 and 29. The structure can be simplified.

  As shown in FIGS. 9 to 12, the lower ends of the plurality of support legs 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 support legs 82, 84, 86 are fixed. 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. Accordingly, the connecting portion between the plurality of support legs 82, 84, 86 and the support base 87 is attached and detached, the support base 87 is removed, the upper surface side of the diesel engine 1 is greatly opened, and maintenance work on the upper surface side of the diesel engine 1 is simplified. The support base 87 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 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 through a support base 87 within the width of the diesel engine 1 in the direction of the 4-axis output shaft, and the direction intersecting with the output shaft 4-core of the diesel engine 1 is intersected. And the exhaust gas movement directions of the first case 28 or the second case 29 are 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 so 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 path from the exhaust manifold 6 of the diesel engine 1 to the exhaust gas outlet of the second case 29 can be formed short, and the exhaust gas purification device 27 can be compactly placed on the upper surface side of the diesel engine 1.

  On the other hand, as shown in FIGS. 13 to 14, a tail pipe 78 is erected on the front surface of the right corner of the cabin 57 of the front surface of the cabin 57, and the lower end side of the tail pipe 78 is extended toward the inside of the bonnet 56. Then, the lower end side of the tail pipe 78 is connected to the SCR outlet pipe 37 via the bellows-shaped flexible pipe 79, and the exhaust gas purified in the second case 29 is discharged from the tail pipe 78 toward the upper side of the cabin 57. Is done. By connecting the flexible pipe 79, mechanical vibration transmitted from the diesel engine 1 side to the tail pipe 78 side is reduced. A urea water tank 71 is installed on the left side of the bonnet 56 on the opposite side of the front side of the cabin 57 from the right side where the tail pipe 78 is disposed. That is, the tail pipe 78 is arranged on the right side of the rear part of the bonnet 56, while the urea water tank 71 is arranged on the left side of the rear part of the bonnet 56. As shown by the phantom lines in FIGS. 13 to 14, in the structure including the tail pipe 78a fixed to the diesel engine 1 side, the tail pipe 78 is integrally connected to the SCR outlet pipe 37, and the flexible pipe 79 is omitted. be able to.

  Further, a urea water tank 71 is mounted on the traveling machine body 52 (such as the bottom frame of the cabin 57) on the rear left side of the bonnet 56. An oil filling port 46 of the fuel tank 45 and a water filling port 72 of the urea water tank 71 are provided adjacent to each other at the lower front portion on the left side of the cabin 57. The tail pipe 78 is disposed on the front surface on the right side of the cabin 57 where the operator's boarding / alighting frequency is low, while the oil inlet 46 and the water inlet 72 are disposed on the front surface on the left side of the cabin 57 where the operator's boarding / alighting frequency is high. The cabin 57 is configured so that the operator can get on and off the control seat 58 from either the left side or the right side.

  3 to 5 and 14, a urea water injection pump 73 that pumps the urea aqueous solution in the urea water tank 71, an electric motor 74 that drives the urea water injection pump 73, and a urea water injection pump 73. Is provided with a urea water injection nozzle 76 connected via a urea water injection pipe 75. A urea water injection nozzle 76 is attached to the urea mixing pipe 39 via an injection base 77, and the urea aqueous solution is sprayed from the urea water injection nozzle 76 into the urea mixing pipe 39.

  With 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, 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. The SCR catalyst 32 and the oxidation catalyst 33 in the second case 29 reduce nitrogen oxides (NOx) in the exhaust gas in which urea water is mixed as ammonia, 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 that removes particulate matter in the exhaust gas of the diesel engine 1 and a second case 29 that removes nitrogen oxides in the exhaust gas of the diesel engine 1. In a working vehicle engine device in which the second case 29 is connected to the first case 28 via the urea mixing pipe 39, support legs 82, 84, 86 projecting from the diesel engine 1, and the support legs 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 plane of the support base 87. Therefore, the support base 87 can be easily fixed to the diesel engine 1 via the support legs 82, 84, 86 in the post-installation work (near the final assembly process of the diesel engine 1). The case 28 and the second case 29 can be supported in an appropriate posture, and the detachability of the first case 28 and the second case 29 can be improved.

  As shown in FIG. 1 to FIG. 12 and FIG. 15, the plane (positioning body) of the support base 87 is placed on the horizontal surface (exhaust gas outlet surface 7 a) of the exhaust gas outlet (exhaust gas outlet pipe 7) of the outer surface of the diesel engine 1. 89 bottom surface) is brought into surface contact, and the support base 87 is joined 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 plane of the support base 87 (bottom surface of the positioning body 89). When the support base 87 is fixed to the support legs 82, 84, 86, the upper surface side of the support base 87 is configured to be substantially horizontal. Therefore, the mounting angle of the support base 87 can be easily determined by connecting the exhaust gas outlet pipe 7 (exhaust gas outlet portion) and the support base 87, but the support base 87 has a highly rigid sheet metal structure. Mounting strength can be easily secured. For example, it is possible to improve the assembly workability in which the mounting angle of the support base 87 is formed horizontally with respect to the diesel engine 1.

  As shown in FIGS. 1 to 12 and 15, a positioning body 89 is integrally fixed to a support base 87, and an opening surface (exhaust gas outlet surface 7 a) of an exhaust gas outlet portion (exhaust gas outlet pipe 7) of the diesel engine 1. The positioning body 89 is brought into surface contact with the diesel engine 1 and the support base 87 is joined to the diesel engine 1 via the positioning body 89 so that the upper surface of the support base 87 is substantially horizontal. Therefore, after the support base 87 is formed by pressing or the like, the support base 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 base 87 with high accuracy. Can be formed. 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 a connecting jig for the support base 87. Since the positioning body 89 is provided as a connecting jig for the support base 87, the attaching / detaching operation of the support base 87 can be easily performed even at a repair place of the diesel engine 1 where the connecting jig for the support base 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 purification unit (exhaust gas purification device 27), and support legs 82, 84, 86. An exhaust purification unit (exhaust gas purification device 27) is integrally attached to and detached from the flat upper surface side of the support base 87, the lower surface side of which is fixed. Accordingly, the cases 28 and 29 can be attached and detached as a single component, and the assembly / disassembly workability of the cases 28 and 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 for a work vehicle in which a second case 29 is connected to a first case 28 via a urea mixing pipe 39, the diesel engine 1, the first case 28, and the second case 29 are integrally fixed, and the diesel engine 1 And the 1st case 28 and the 2nd case 29 are comprised so that vibration is possible integrally. Therefore, the diesel engine 1, the first case 28, and the second case 29 can be configured in 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. And the exhaust gas path structure between the diesel engine 1 and the second case 29 can be configured at low cost. That is, there is no need to connect a vibration isolating 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 exhaust gas path structure between the cases 29 can be configured at low cost.

  As shown in FIGS. 1 to 10, a plurality of support legs 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 ends of the plurality of support legs 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 base 87. Therefore, the support base 87 can be easily separated from the attached parts of the diesel engine 1. Further, the first case 28 and the second case 29 can be integrally attached to the diesel engine 1 to simplify the exhaust gas piping of the cases 28 and 29, and the first case 28 and the second case can be connected to the cylinder head 2. The two cases 29 can be fixed with high rigidity. In addition, by adjusting the connecting portions of the plurality of support legs 82, 84, 86 and the support base 87, it is possible to absorb processing errors of mounting parts such as the support base 87, and to easily adjust the mounting inclination angle of the support base 87. The first case 28 and the second case 29 can be supported in a predetermined posture. The assembly workability 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 of the diesel engine 1 where the exhaust manifold 6 is installed, and the first engine 28 extends in the direction intersecting the output shaft core line of the diesel engine 1. The first case 28 is attached so that the exhaust gas in the first case 28 can move, and the second case 29 is arranged side by side on the side of the cooling fan 24 of the diesel engine 1 on the side of the first case 28. ing. Accordingly, the first case 28 and the second case 29 can be arranged close to each other on the upper surface side of the diesel engine 1, and the second case 29 is interposed between the cooling fan 24 and the first case 28. The temperature drop of the first case 28 due to 24 winds can be reduced. Further, a urea mixing pipe 39 that supplies exhaust gas from the first case 28 to the second case 29 is supported between the first case 28 and the second case 29, so that the cooling fan 24 and the urea mixing pipe 39 are interposed. By interposing the second case 29, the temperature drop of the urea mixing tube 39 due to the cooling fan 24 wind can also be reduced.

  As shown in FIGS. 1 to 8, 13, and 14, it is a work vehicle in which a driving cabin 57 is arranged behind a hood 56 in which the diesel engine 1 is installed, and includes a front portion of the driving cabin 57 and a rear portion of the diesel engine 1. A urea water tank 71 for exhaust gas purification is installed between the two. Therefore, the urea water tank 71 can be heated by exhaust heat from the diesel engine 1 or the like, the urea aqueous solution temperature in the urea water tank 71 can be maintained at a predetermined level or more, and the exhaust gas purification ability of the second case 29 can be achieved in cold regions. It can be prevented from lowering. The water supply port 72 of the urea water tank 71 can be disposed close to the operator boarding / alighting portion of the operation cabin 57, and the urea aqueous solution water supply operation to the urea water tank 71 can be easily performed at the operator boarding / alighting place. The replenishment workability of the urea aqueous solution can be improved.

  As shown in FIGS. 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 oxides in the exhaust gas of the diesel engine 1. A plurality of case fixing bodies 95 and 96 for fixing the first case 28 and the second case 29 to each other in the engine device for connecting the second case 29 to the first case 28 via the urea mixing pipe 39. A support frame body 98 for fixing a plurality of case fixing bodies 95 and 96 is provided, and the case fixing bodies 95 and 96 and the support frame body 98 are connected so that the mounting angle (attachment position) can be adjusted, and attached to the mounting surface of the diesel engine 1. On the other hand, since the posture of the exhaust gas inlet 34 of the first case 28 is adjustable, the first case 28 and the second case 2 are added to the diesel engine 1. When the unit is assembled as a unit, the case fixing bodies 95 and 96 and the support frame body 98 are attached to the exhaust gas outlet surface 7a of the diesel engine 1 by adjusting the attachment angle (attachment position). The connecting surface of the DPF inlet pipe 34 can be easily joined. The operation for positioning the first case 28 and the second case 29 can be simplified. That is, the detachability workability of the first case 28 and the second case 29 can be improved, and the assembly work or maintenance work of the diesel engine 1 can be simplified.

  As shown in FIGS. 1 to 12, each case 28, 29, case fixing bodies 95, 96 and support frame body 98 form an exhaust gas purification device 27 as an exhaust purification unit, and a cylinder head of the diesel engine 1. The lower end sides of the plurality of support legs 82, 84, 86 are fixed to the outer surface of the second support frame 98, and the support frame 98 is connected to the upper ends of the support legs 82, 84, 86. Therefore, maintenance work and the like 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 through 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 the attached parts of the diesel engine 1 can be easily reduced.

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

  As shown in FIGS. 1 to 12 and 15, a part of the lower surface side of the support base 87 is brought into surface contact with a part of the exhaust gas outlet surface 7 a of the diesel engine 1, and the exhaust gas outlet surface 7 a of the diesel engine 1 is used as a reference. Thus, the support base 87 is configured to be fixed to the diesel engine 1 in a horizontal posture. Therefore, the support base 87 having a high-rigidity structure can be configured at a low cost by sheet metal processing, and the positioning operation during assembly for assembling the support frame body 98 on the upper surface side of the support base 87 can be easily simplified. In contrast, the support base 87 can be easily connected to a predetermined support posture.

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

  In addition, an upstream side gas temperature sensor 115 for detecting the exhaust gas temperature on the exhaust gas intake side of the diesel oxidation catalyst 30 and a downstream side gas temperature sensor 116 for detecting the exhaust gas temperature on the exhaust gas discharge side of the diesel oxidation catalyst 30 are provided. Yes, the difference (exhaust gas differential pressure) 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 is detected by the differential pressure sensor 111, and the soot filter 31. The exhaust gas temperature of 30 parts of the diesel oxidation catalyst on the exhaust gas intake side is detected by the temperature sensors 115 and 116. That is, since the residual amount of the 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 the particulate matter remaining in the soot filter 31 increases more than a predetermined amount. Based on the detection result of the differential pressure sensor 111, soot filter regeneration control for reducing the amount of particulate matter in the soot filter 31 (for example, fuel injection control or intake control of the diesel engine 1 for increasing the exhaust gas temperature) is executed.

  Next, the assembly / disassembly 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 by 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 inside the exhaust intake side case 121, the soot filter 31 is provided inside the inner cylinder 122b of the exhaust discharge side case 122, and the exhaust gas intake of the inner cylinder 122b is inserted into the outer cylinder 122c of the exhaust discharge side case 122. The side is provided internally, and the exhaust gas discharge side of the inner cylinder 122b is projected from the outer cylinder 122c.

  Further, the exhaust gas discharge side of the inner cylinder 122b is inserted into the exhaust intake side case 121 so that it can be inserted and removed, and the case flange body 121a of the exhaust intake side case 121 and the case flange body 122a of the outer cylinder 122c are separable with bolts 123. The exhaust intake side case 121 and the exhaust discharge side case 122 are detachably connected. On the other hand, a DPF outlet pipe 35 serving as an exhaust outlet pipe is provided in the exhaust discharge side case 122 (outer cylinder 122c), and a radial direction intersecting with the exhaust gas movement direction of the first case 28 (perpendicular to the cylindrical axis of the first case 28). 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 pipe 39 and the DPF outlet pipe 35 includes an outlet pipe flange 41 a at an end portion of the exhaust gas outlet side of the DPF outlet pipe 35 and an exhaust gas inlet of the urea mixing pipe 39. The outlet pipe flange 41a is positioned on the outer side 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 position outside the separation locus of the exhaust discharge side case 122 in which the DPF outlet pipe 35 is extended outside the exhaust discharge side case 122 in the direction crossing the exhaust gas movement direction and separated in the exhaust gas movement direction. In addition, a connecting portion (DPF outlet side flange body 41) between 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 with a bolt 124, and one end side 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 side 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 the particulate matter in the soot filter 31 (detected value of the differential pressure sensor 111, etc.) increases beyond the regeneration controllable range, the bolt 123 is removed and the case flange bodies 121a, 122a are removed. When the bolts 124 are 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 cylindrical axial center direction (exhaust gas movement direction) of the first case 28, and the inner cylinder 122 b is extracted from the exhaust intake side case 121. Detach and disassemble. Next, the maintenance work of the 1st case 28 which takes out the soot filter 31 from the inner cylinder 122b and artificially removes the particulate matter of the soot filter 31 is performed.

  When the bolt 123 is removed and the fastening of the case flange bodies 121a and 122a is released, the exhaust intake case 121 is supported by the exhaust gas outlet pipe 7 via the DPF inlet pipe 34, and the bolt 124 is removed. Then, when the fastening of the outlet pipe flange 41a and the mixing pipe flange 41b is released, the urea mixing pipe 39 is supported by the second case 29 via the SCR inlet side flange body 40. Accordingly, in the maintenance (filter regeneration) operation of the soot filter 31, it is not necessary to remove only the exhaust discharge side case 122, and it is not necessary to remove the exhaust intake side case 121 or the urea mixing pipe 39, so the exhaust intake side case 121 or the urea mixing pipe The maintenance man-hour of the soot filter 31 can be reduced as compared with a structure such as 39 that requires disassembly.

  As shown in FIGS. 1 to 7, 18, and 19, a first case 28 that removes particulate matter in the exhaust gas of the engine 1 and a second case that removes nitrogen oxides in the exhaust gas of the engine 1. 29, the first case 28 is divided into an exhaust intake side case 121 and an exhaust discharge side case 122, in an engine device for a work vehicle in which the second case 29 is connected to the first case 28 via a urea mixing pipe. The exhaust discharge side case 122 is separable while the exhaust intake side case 121 is supported on the engine 1 side. Accordingly, in the maintenance work inside the first case 28, it is not necessary to remove the entire first case 28, and the number of detachable parts required for the maintenance work inside the exhaust discharge side case 122 (first case) can be easily reduced, and the exhaust The soot filter 31 or the like provided inside the discharge side case 122 can be easily removed, and the number of cleaning steps for the inside of the exhaust discharge side case 122 or the soot filter 31 can be reduced.

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

  As shown in FIGS. 1 to 7, 18, and 19, case fixing bodies 95 and 96 and fastening bands 97 as clamping bodies for fixing the exhaust intake side case 121 and the second case 29, an exhaust discharge side case 122, Case fixing bodies 95 and 96 and fastening bands 97 as clamping bodies for fixing the second case 29 are provided, and the first case 28 and the second case 29 are integrated by the case fixing bodies 95 and 96 and the fastening bands 97. The exhaust gas purification device 27 as an exhaust gas purification unit is formed. Therefore, the exhaust discharge side case 122 can be easily attached and detached by removing the fastening band 97 that fixes the exhaust discharge side case 122 and the second case 29. When maintaining the inside of the exhaust discharge side case 122, it is not necessary to attach or detach the fastening band 97 that fixes the exhaust intake side case 121 and the second case 29. Cleaning) Workability can be improved.

  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 together with the case fixing bodies 95 and 96 are provided. And a plurality of support legs 82, 84, 86 are provided upright on the upper surface side of the diesel engine 1. The support base 87 is provided on the exhaust manifold 6 and the plurality of support legs 82, 84, 86 of the diesel engine 1. Are connected. Therefore, by adjusting the connecting portion of the support legs 82, 84, 86 and the support base 87, it is possible to absorb processing errors of mounting parts such as the support base 87, and to easily correct the mounting inclination angle of the support base 87, 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 the attached parts of the diesel engine 1 so as to eliminate mutual interference. The assembly workability of assembling the first case 28 and the second case 29 to the diesel engine 1 can be easily improved.

  Next, a skid steer loader 151 equipped with the diesel engine 1 will be described with reference to FIGS. A skid steer loader 151 as a work vehicle shown in FIGS. 20 and 21 is configured to perform a loader work by mounting a loader device 152 described later. In the following description, the left side of the skid steer loader 151 in the forward direction is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side. The skid steer loader 151 is provided with left and right traveling crawler portions 154. Further, an openable / closable bonnet 155 is disposed above the traveling crawler portion 54 of the skid steer loader 151. The diesel engine 1 is accommodated in the bonnet 155. The first case 28 and the second case 29 are mounted on the upper surface of the diesel engine 1 inside the bonnet 155.

  The diesel engine 1 is supported on a traveling machine body 156 included in a skid steer loader 151 via a vibration isolation member or the like. In front of the hood 155, a cabin 157 on which a driver is boarded is disposed. Inside the cabin 157, a steering handle 158, a driver 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 for driving the left and right traveling crawler portions 154 are provided. The power from the diesel engine 1 is transmitted to the left and right traveling crawler portions 154 via the traveling mission device 161. An operator who sits on the driver's seat 159 can perform a traveling operation or the like of the skid steer loader 151 via an operation unit such as the steering handle 158.

  The loader device 152 includes loader posts 162 disposed on the left and right sides of the traveling machine body 156, a pair of left and right lift arms 163 coupled to the upper ends of the loader posts 162 so as to be vertically swingable, and left and right lift arms 163. And a bucket 164 coupled to the tip portion so as to be swingable up and down.

  Between each loader post 162 and the corresponding lift arm 163, a lift cylinder 166 for vertically swinging the lift arm 163 is provided. A bucket cylinder 168 for swinging the bucket 164 up and down is provided between the left and right lift arms 163 and the bucket 164. In this case, when the operator of the control seat 159 operates a 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 are expanded and contracted, and the lift arm 163 is operated. The bucket 164 is swung up and down to perform the loader operation. The urea water tank 71 is installed in the upper front side of the bonnet 155. The radiator 19 disposed to face the cooling fan 24 is installed in the rear part of the bonnet 155.

  As shown in FIGS. 1 to 12, 15 to 19, and 22 to 27, a first case 28 that removes particulate matter in the exhaust gas of the diesel engine 1 and nitrogen in the exhaust gas of the diesel engine 1. In an engine device including a second case 29 for removing oxidant and connecting the second case 29 to the first case 28 via a urea mixing tube 39, a plurality of front portions and sides for connecting one end side to the diesel engine 1 The support base 87 connected to each of the support legs 82, 84, 86 and the plurality of support legs 82, 84, 86 is provided, and the first case 28 and the second case 29 are arranged on the support base 87. . Therefore, the support part (support base 87) of the first case 28 and the second case 29, and the support pillars 82, 84, 86 on the front part, the side part, and the rear part that support the support part (support base 87). ) And the support structure for the first case 28 and the second case 29 can be configured, so that a cooling air passage can be secured between the front and side and rear support legs 82, 84, 86, While the ventilation performance of the outer periphery of the diesel engine 1 can be maintained satisfactorily, interference between the attached parts of the diesel engine 1 and the first case 28 or the second case 29 can be reduced, and the assembly workability of the diesel engine 1 can be improved. The maintenance workability of the diesel engine 1 can be improved.

  As shown in FIGS. 1 to 12 and 15 to 19, a support frame body 98 for fixing the first case 28 and the second case 29 is provided, and a plurality of support legs 82, 84, 86 are provided on the upper surface side of the diesel engine 1. The support base 87 is fixed substantially horizontally via the support base, the support frame body 98 is fixed to the upper surface side of the support base 87, and the cylindrical first case 28 is attached to the upper surface side of the support base 87 via the support frame body 98. The second case 29 is placed in a horizontal position, and a urea mixing tube 39 is arranged between the parallel first case 28 and second case 29 on the upper surface side in parallel. Accordingly, the first case 28 and the second case 29 can be assembled and disassembled integrally by separating the support base 87 and the support frame body 98, and the first case 28 and the second case 29 are disposed on the upper surface side of the diesel engine 1. Can be supported in a compact and compact manner. Further, the mounting interval between the first case 28 and the second case 29 can be kept constant by a simple assembling operation via the support frame 98, and the exhaust gas such as the urea mixing tube 39 between the cases 28 and 29 can be maintained. The piping structure can be simplified.

  As shown in FIGS. 7 to 12 and FIGS. 15 to 17, vent holes 87 a are formed in the support base 87 on the lower surface side of the first case 28 or the second case 29, and the support legs 82 of the front part, the side part, and the rear part are formed. , 84, 86 and the vent 87a, an air passage 94 is formed between the diesel engine 1 and each case. Therefore, it is possible to easily suppress an increase in the temperature of the outer periphery of the diesel engine 1 facing the first case 28 or the second case 29, and it is possible to improve the durability of the accessory parts on the upper surface side of the diesel engine 1.

  As shown in FIGS. 1 to 12 and FIGS. 22 to 27, the first case 28 and the second case 29 are integrally fixed by the support frame body 98, and the exhaust gas purification device 27 as an exhaust purification unit is provided. At the same time, the exhaust gas purification device 27 is detachably supported by the support base 87. Therefore, the cases 28 and 29 can be easily assembled to the diesel engine 1 in the assembly process near the final part in the assembly process of the diesel engine 1 and the exhaust gas can be used for maintenance work or repair work of the diesel engine 1. The gas purification device 27 can be easily removed from the diesel engine 1. In addition, for example, the diesel engine 1 and the exhaust gas purifying device 27 can be packed in a low volume on a transportation pallet or the like in a separated state, and can be effectively stacked and stored inside the transportation container. The diesel engine 1 and the exhaust gas purification device 27 can be efficiently packed, and the work mounted on the work vehicle (the tractor 51 or the skid steer loader 151) from the work place (assembly factory) where the diesel engine 1 or the exhaust gas purification device 27 is assembled. Transport costs for transportation to a place (assembly factory) can be reduced.

  Next, as shown in FIGS. 11, 12, 15 to 17, 28, and 29, the exhaust gas outlet pipe 7 is also used as a support member of the exhaust gas purification device 27, and a highly rigid exhaust gas outlet is provided. The exhaust gas purification device 27 is supported by the pipe 7, and the exhaust gas purification device 27 is attached to the outer peripheral side (upper surface side) of the diesel engine 1. The lower end side of the front support leg 82 is fastened to the left side corner of the front part of the cylinder head 2 having a rectangular shape in plan view of the diesel engine 1, and the side support leg is attached to the right side corner of the front part of the cylinder head 2. The lower end side of the body 84 is fastened with a bolt 83, and the lower end side of the rear support leg 86 is fastened with a bolt 85 on the rear surface of the rear portion of the cylinder head 2.

  That is, the front supporting leg 82, the side supporting leg 84, and the rear supporting leg in three directions, ie, the left side and right side of the front part of the cylinder head 2 having a rectangular shape in plan view of the diesel engine 1 and the rear side of the rear part of the cylinder head 2. The lower end side of each support 86 is fastened, and the upper end side of a plurality of support legs (front support legs 82, side support legs 84, rear support legs 86) is attached to the lower surface side of the support 87 having a rectangular shape in plan view. A support base 87 is disposed on the upper surface side of the diesel engine 1 via the support legs 82, 84, 86, and a support frame body 98 is detachably fixed to the substantially horizontal upper surface side of the support base 87; An exhaust gas purification device 27 is placed on the upper surface of the support base 87.

  Further, as shown in FIGS. 15 and 28, a part of the support base 87 (positioning body 89) is extended to the exhaust gas outlet surface 7a on the upper surface side of the exhaust gas outlet pipe 7 of the diesel engine 1 so as to open downward. The exhaust gas inlet pipe (DPF inlet pipe 34) of the first case 28 abuts the exhaust gas outlet face 7a on the upper surface side of the exhaust gas outlet pipe 7 from above, while the exhaust gas outlet face on the upper surface side of the exhaust gas outlet pipe 7 7a is brought into contact with the lower surface side of the positioning body 89 (a part of the support base 87) from above, and is supported on the exhaust gas outlet pipe 7 with positioning bolts 90 and nuts embedded in the exhaust gas outlet surface 7a. A stand 87 is fastened.

  As shown in FIGS. 11, 12, 15 to 17, 28, and 29, the first case 28 for removing particulate matter in the exhaust gas of the diesel engine 1 and the nitrogen in the exhaust gas of the diesel engine 1 In an engine device that includes a second case 29 for removing oxidizing substances and connects the second case 29 to the first case 28 via a urea mixing tube 39, the first case 28 and the second case 29 are attached to the support frame body 98. The DPF inlet pipe 34 as the exhaust gas inlet pipe of the first case 28 is connected to the exhaust gas outlet pipe 7 of the diesel engine 1 while the exhaust gas purification device 27 as the exhaust gas purification unit is formed. The exhaust gas outlet pipe 7 is also used as a support member for the exhaust gas purification device 27. Therefore, the exhaust gas purification device 27 is mounted on the outer peripheral side of the diesel engine 1, and the exhaust gas purification device 27 is supported by the highly rigid exhaust gas outlet pipe 34, so that the support strength of the exhaust gas purification device 27 can be easily secured. At the same time, the exhaust gas purification device 27 can be easily attached to and detached from the diesel engine 1 during maintenance work or repair work of the diesel engine 1.

  As shown in FIGS. 11, 12, 28, and 29, the upper ends of the front, side, and rear support legs 82, 84, 86 are connected to the lower surface side of the support base 87 that is rectangular in plan view, A support base 87 is disposed on the upper surface side of the diesel engine 1 via the support legs 82, 84, 86, and a support frame body 98 is detachably fixed to the substantially horizontal upper surface side of the support base 87. Accordingly, the exhaust gas purification device 27 is supported by the respective support legs 82, 84, 86 and the exhaust gas outlet pipe 7, and the support strength of the exhaust gas purification device 27 can be easily secured. Support structures such as 82, 84, 86 can be easily simplified. Further, since the support base 87 can be disposed via the support legs 82, 84, 86 at positions separated from the outer peripheral surface of the diesel engine 1, interference with the attached parts of the diesel engine 1 can be reduced. The assembly workability of the engine 1 can be improved and the maintenance workability of the diesel engine 1 can be improved.

  11, 12, 28, and 29, the respective support legs are arranged in three directions, that is, a left side and a right side of the front part of the cylinder head 2 having a rectangular shape in plan view of the diesel engine 1 and a back side of the rear part of the cylinder head 2. The lower ends of the bodies 82, 84, 86 are fastened. Therefore, the exhaust gas purification device 27 can be supported with the outer peripheral portion of the cylinder head 2 as a fixed portion, and the exhaust gas purification device 27 can be assembled to the diesel engine 1 with almost no change on the diesel engine 1 main body side. Further, in a diesel engine 1 assembly factory or the like, the diesel engine 1 can be lifted by a chain block or the like using the support legs 82, 84, 86 as an engine lifting bracket mounting seat and easily moved to a storage place or an assembly place.

  As shown in FIGS. 15 to 17, 28, and 29, a support base is provided on the upper surface side of the exhaust gas outlet pipe 7 of the diesel engine 1 with which the DPF inlet pipe 34 (exhaust gas inlet pipe) of the first case 28 abuts. A part of the support 87 is brought into contact with the upper surface side of the exhaust gas outlet pipe 7 of the diesel engine 1 from above, and the support base 87 is fastened to the exhaust gas outlet pipe 7. Therefore, the upper surface of the exhaust gas outlet pipe 7 can be formed as an attachment reference for both the exhaust gas purification device 27 and the support base 87. That is, since the attachment position (height or levelness, etc.) of the exhaust gas purifying device 27 or the support base 87 can be determined on the upper surface of the exhaust gas outlet pipe 7, the exhaust gas outlet pipe 7 can be determined at a diesel engine 1 assembly plant or the like. After the support base 87 is fastened to the (diesel engine 1), the exhaust gas purification device 27 can be fastened to the support base 87. When the exhaust gas purifying device 27 is installed in the diesel engine 1, processing dimension errors of the exhaust gas purifying device 27 or the support base 87 can be easily eliminated, and the workability of assembling the exhaust gas purifying device 27 can be improved.

  Next, as shown in FIGS. 9 to 12, 15 to 17, and 28 to 30, the support base 87 is provided on the left side surface of the at least two side support legs 84 and the rear side surface of the rear support leg 86. While the inner surfaces of the left side wall 87b and the rear side wall 87c are brought into contact with each other and fastened, the upper surface of at least one front support leg 82 and the lower surface of the ceiling wall 87d of the support base 87 are brought into contact with each other and bolts 88 are fastened. The mounting position is adjusted between the front side surface of the front support leg 82 to be brought into contact with the lower surface of the ceiling wall 87d of the support base 87, the inner surface of the front side wall 87e of the support base 87, and the right side surface of the front support leg body 82 and the inner surface of the right side wall 87f. The gaps 82a and 82b are formed, and the opposing surfaces are separated from each other.

  That is, the fastening bolt 88 is screwed to the front support leg 82 and the support base 87 from the upper surface direction, and the fastening bolt 88 is screwed to the side support leg body 84 and the support base from the left side direction to support the rear support leg body 86. The fastening bolt 88 is screwed onto the base 87 from the rear side surface direction. Further, a support base 87 is fixed to the exhaust gas outlet pipe 7 from above through a positioning bolt 90 and a positioning nut 90a provided on the upper surface side (exhaust gas outlet face 7a) of the exhaust gas outlet pipe 7 of the engine 1. ing. In addition, the DPF inlet pipe 34 connected to the exhaust gas outlet pipe 7 is fixed to the exhaust gas outlet pipe 7 from above through a bolt 80 and a nut 80a provided on the exhaust gas outlet face 7a.

  As shown in FIGS. 9 to 12, 15 to 17, and 28 to 30, a first case 28 that removes particulate matter in the exhaust gas of the diesel engine 1, and nitrogen in the exhaust gas of the diesel engine 1. In an engine device that includes a second case 29 for removing oxidizing substances and connects the second case 29 to the first case 28 via a urea mixing tube 39, a support base 87 on which the first case 28 and the second case 29 are disposed. And a support base 87 is provided on the upper surface side of the diesel engine 1 via a plurality of support legs (front support legs 82, side support legs 84, rear support legs 86), and each of the support legs 82, 84, 86, one side support leg 84 and the rear support leg 86 are brought into contact with the side surfaces of the support base 87 and fastened, while the other front part of each of the support legs 82, 84, 86 is fixed. Top surface of support leg 82 It is configured so as to abut against the lower surface of the support base 87 is fastened. Therefore, even if a processing error occurs at the fixed position of the support base 87 with respect to the support legs 82, 84, 86, the mounting positions of the support legs 82, 84, 86 and the support base 87 can be easily adjusted. Without correcting the shape of each of the support legs 82, 84, 86 or the support base 87, a bolt 88 fastening operation for connecting the support legs 82, 84, 86 and the support base 87 can be easily performed, The mounting workability of the support legs 82, 84, 86 and the support base 87 can be improved.

  9 to 12, 15 to 17, and 28 to 30, a support base for arranging the first case 28 and the second case 29 is provided, and at least three or more bodies are provided on the upper surface side of the diesel engine 1. A support base 87 is provided via the support legs 82, 84, 86, and at least two or more side support legs 84 and rear support legs 86 are provided on the side surfaces of the left side wall 87b and the rear side wall 87c of the support base 87. The upper surface of at least one front support leg 82 and the lower surface of the ceiling wall 87d of the support base 87 are brought into contact with each other and fastened to contact the lower surface of the ceiling wall 87d of the support base 87. The front side surface and the right side surface of the front support leg 82 are separated from the front side wall 87e and the right side wall 87f of the support base 87 through gaps 82a and 82b. Accordingly, when fastening at least one front support leg 82 upper surface and the support base 87 bottom surface, fastening errors between at least two side support legs 84 and the rear support leg 86 side surfaces and the support base 87 side surfaces ( Machining dimension errors) can be easily absorbed. The processing effort to correct the processing dimension error of each of the support legs 82, 84, 86 or the support base 87 can be omitted, and the fastening operation of the support legs 82, 84, 86 and the support base 87 can be simplified.

  As shown in FIGS. 9 to 12 and FIGS. 28 to 30, at least one front support leg 82 and the support base 87 are screwed with fastening bolts 88 from the upper surface side, while at least two or more side support legs are attached. A fastening bolt 88 is screwed onto the body 84, the rear support leg 86, and the support base 87 from the side. Therefore, the fastening bolt 88 is attached to at least three or more front support legs 82, side support legs 84, and rear support legs 86 on the upper surface of the support base 87, on either the left or right side, or on either side of the front or back. Can be fixed through. That is, since each said supporting leg 82,84,86 and the support stand 87 are fastened from the attachment direction of the same number as each said supporting leg 82,84,86, each said supporting leg 82,84,86 or support is carried out. The processing dimension error of the base 87 can be easily absorbed, and the connection rigidity between the support legs 82, 84, 86 and the support base 87 can be easily improved. In addition, while the support case 87 can be formed in a rectangular shape on which the first case 28 and the second case 29 can be easily mounted, the support table 87 can easily cover the rectangular upper surface side of the diesel engine 1. The first case 28 and the second case 29 can be placed on the upper surface side of the diesel engine 1 by using the support base 87 as an upper surface side cover of the diesel engine 1.

  As shown in FIGS. 9, 15, and 28 to 30, a part of the support 87 is provided on the exhaust gas outlet pipe 7 through a positioning bolt 90 provided on the upper surface side of the exhaust gas outlet pipe 7 of the diesel engine 1. The positioning body 89 formed as shown in FIG. Therefore, the exhaust gas purifying device 27 such as the first case 28 and the second case 29 and the support base 87 can be connected with the exhaust gas outlet pipe 7 as a reference, and the simple connection position adjustment of the support base 87 can be performed. Assembling dimensional errors of the exhaust gas purifying device 27 such as the first case 28 and the second case 29 can be easily eliminated, and the assembling workability of the exhaust gas purifying device 27 such as the first case 28 and the second case 29 is improved. it can.

1 Diesel engine 2 Cylinder head 7 Exhaust gas outlet pipe 27 Exhaust gas purification device (exhaust purification unit body)
28 First case 29 Second case 34 DPF inlet pipe (exhaust gas inlet pipe)
39 Urea mixing pipe 82 Front support leg 84 Side support leg 86 Rear support leg 87 Support base 89 Positioning body (part of support base)
98 Support frame

Claims (4)

A first case for removing particulate matter in the exhaust gas of the engine and a second case for removing nitrogen oxides in the exhaust gas of the engine are provided, and the second case is connected to the first case via a urea mixing tube. In the engine device to which the case is connected,
The first case and the second case are integrally fixed by the support frame body to form an exhaust purification unit, and the exhaust gas inlet pipe of the first case is connected to the exhaust gas outlet pipe of the engine. An engine apparatus characterized in that the exhaust gas outlet pipe is also used as a support member of the exhaust purification unit.   The upper ends of a plurality of support legs are connected to the lower surface side of a rectangular support base in plan view, the support base is disposed on the upper surface side of the engine via the plurality of support legs, and the support base is substantially horizontal. The engine device according to claim 1, wherein the support frame body is detachably fixed to an upper surface side.   3. The lower ends of the plurality of support legs are fastened in three directions: a left side surface and a right side surface of a cylinder head front portion having a rectangular shape in plan view of the engine, and a back surface of the rear portion of the cylinder head, respectively. The engine device described in 1.   A part of the support is extended on the upper surface side of the exhaust gas outlet pipe of the engine that the exhaust gas inlet pipe of the first case contacts, and the upper surface side of the exhaust gas outlet pipe of the engine is The engine apparatus according to claim 2, wherein a part of the support base is brought into contact with the exhaust base and the support base is fastened to the exhaust gas outlet pipe.

Images