JP2015183544A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device where a plurality of harness connectors 132 can be supported together in one place, resulting in simplified work for joining or removing sensor harnesses 134.SOLUTION: The engine device includes a first case 28 for removing particulate matters from exhaust gas from an engine 1, and a second case 29 for removing nitrogen oxide substances from the exhaust gas from the engine 1, the second case 29 being connected to the first case 28 via a urea mixing tube 39. A single connector bracket body 131 is provided on a support base 87 where the first case 28 or the second case 29 is disposed, and the plurality of harness connectors 132 to be connected to exhaust gas temperature sensors 115, 116 and 117 or exhaust gas pressure sensors provided in the first case 28 or the second case 29 are collectively disposed on the connector bracket body 131.

Description

  The present invention relates to an engine device such as a diesel engine mounted on an agricultural machine (tractor, combine) or construction machine (bulldozer, hydraulic excavator, loader), and more specifically, particulate matter contained in exhaust gas ( The present invention relates to an engine device equipped with an exhaust gas purification device that removes 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 diesel particulate filter (hereinafter referred to as a DPF case) as an exhaust gas purifying device (exhaust gas aftertreatment device) in the exhaust path of a diesel engine, and a urea selective reduction type catalyst are provided. A technique is known in which an internal case (hereinafter referred to as an SCR case) is provided, exhaust gas is introduced into the DPF case and the SCR case, and the exhaust gas discharged from the diesel engine is purified (for example, Patent Document 1). To 4).

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

  When assembling the DPF case and the SCR case apart from the engine, the temperature of the exhaust gas supplied from the engine to the DPF case or the SCR case decreases, and regeneration of the diesel particulate filter or selective catalytic reduction action, etc. 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. There is also a technology for attaching the DPF case and the SCR case by attaching the DPF case and the SCR case to the two parallel base frames and fastening the two base frames to the object to be installed. Needs to be formed horizontally (flat), and there is a problem that 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 mounting parts such as a base frame.

  On the other hand, when the DPF case and the SCR case are assembled close to the engine, 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 easily maintained at a high temperature. In addition, it is necessary to secure an installation space for the SCR case on the side of the engine, and it is difficult to make the engine room compact and there is a problem that the DPF case or the SCR case cannot be supported compactly. Furthermore, since the length or assembly position of a plurality of harnesses to be connected to each sensor such as a DPF case or an SCR case is different, the DPF case or the SCR case is used when assembling or maintaining the engine or the DPF case or the SCR case. There is a problem that it is not possible to simplify the joining or removing operation of each sensor and a plurality of sensor harnesses, and it is difficult to easily prevent the sensor harness arranged near the high temperature part from being melted.

  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 an engine device comprising a case and connecting the second case to the first case via a urea mixing tube, a single connector bracket body is provided on a support base on which the first case or the second case is disposed, A plurality of harness connectors to be connected to an exhaust gas temperature sensor or an exhaust gas pressure sensor provided in the first case or the second case are collectively arranged in the connector bracket body.

  According to a second aspect of the present invention, in the engine device according to the first aspect, the support base is attached to the engine via a plurality of support legs, and the connector bracket body is fixed to the machine outer surface of the support base. It is a thing.

  A third aspect of the present invention is the engine device according to the first aspect, wherein the support base is attached to the upper surface side of the engine via a plurality of support legs, the first case and the second case. And the urea mixing pipe are fixed in parallel to the support frame to form an exhaust purification unit, and the exhaust purification unit is detachably fixed to the upper surface side of the support base.

  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 apparatus for connecting the second case to the first case or the second case, a single connector bracket body is provided on a support base on which the first case or the second case is arranged, Since a plurality of harness connectors to be connected to an exhaust gas temperature sensor or an exhaust gas pressure sensor to be provided are arranged in the connector bracket body, a high-temperature portion such as the engine or the first case or the second case and a sensor harness are provided. The plurality of harness connectors can be collectively supported at a position where they do not contact. It is possible to simplify the sensor harness joining or removing work during assembly or maintenance.

  According to the second aspect of the present invention, the support base is attached to the engine via a plurality of support legs, and the connector bracket body is fixed to the outside surface of the support base. The connector bracket body can be protruded and supported from the stand toward the outside of the machine, and the high temperature of the connector bracket body can be easily suppressed by utilizing the cooling air of the engine. The harness connector or the sensor harness can be easily prevented from being abnormally heated by heat conducted from the high temperature portion such as the engine or the first case or the second case to the connector bracket body. It can improve the sex.

  According to a third aspect of the present invention, the support base is attached to the upper surface side of the engine via a plurality of support legs, and the first case, the second case, and the urea mixing tube are supported by the support frame body. The exhaust gas purification unit is formed in parallel to the support base, and the exhaust gas purification unit is detachably fixed to the upper surface side of the support base, so that the exhaust gas purification unit can be supported in a stable posture on the engine. In spite of this, an air passage for heat insulation can be formed between the engine and the exhaust gas purification unit to suppress a high temperature of the support base or the harness connector, and the high temperature of the engine or the first case or the second case can be suppressed. It can prevent easily that a part and a sensor harness contact.

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 back perspective view of a harness connector (harness) attachment part. It is an enlarged rear view of a connector bracket body attachment part.

  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 purifying device 27 for purifying the exhaust gas discharged from each cylinder of the diesel engine 1, a diesel parti that removes particulate matter in the exhaust gas 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 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 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 and FIGS. 15 to 17. As shown in FIGS. 9 to 12 and 15 to 17, the front support leg 82 that fastens the lower end side to the bolt 81 at the right corner of the front surface of the cylinder head 2, and the front side of the left side surface of the cylinder head 2. A side support leg 84 for fastening the bolt 83 at the lower end side to the corner and a rear support leg 86 for fastening the bolt 85 to the lower end side to the rear surface of the cylinder head 2 are provided, and each support leg 82, 84, 86 is attached to the cylinder head 2. 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.

  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, 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 the fastening band 97, and the exhaust gas purifying device as the exhaust gas purifying unit. 27 is constituted. 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 (exhaust purification unit) 27 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. A pair of support frame bodies 98 made of sheet metal having an L-shaped end face 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 purification unit 27 can be suspended and supported. 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.

  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. Further, the exhaust purification unit 27 is formed by being fixed integrally with the support frame body 98, and the exhaust gas as an exhaust purification unit is attached to the diesel engine via the case fixing bodies 95 and 96, the fastening band 97, and the support frame body 98. The 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 DPF inlet as the exhaust gas inlet of the first case 28 is attached to the exhaust gas outlet surface 7a of the diesel engine 1 by adjusting the mounting angle of the case fixing bodies 95 and 96 and the support frame body 98. The connecting surface of the tube 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.

  Further, the upstream side gas temperature sensor 115 for detecting the exhaust temperature on the exhaust gas intake side of the diesel oxidation catalyst 30 inside the first case 28 and the exhaust temperature on the exhaust gas discharge side of the diesel oxidation catalyst 30 inside the first case 28 are set. A downstream gas temperature sensor 116 for detection and an SCR gas temperature sensor 117 for detecting the exhaust gas intake side of the SCR catalyst 32 inside the second case 29 are provided, and the exhaust gas on the inflow side of the soot filter 31 is provided. The difference between the pressure and the exhaust gas pressure on the outflow side of the soot filter 31 (exhaust gas differential pressure) is detected by the differential pressure sensor 111, and the diesel oxidation catalyst 30 part on the exhaust gas intake side of the soot filter 31 is detected. The exhaust gas temperature is detected by the temperature sensors 115 and 116, and the exhaust gas temperature on the exhaust gas intake side of the SCR catalyst 32 is the SCR gas temperature. It is detected by the capacitors 117. 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. 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.

  Next, referring to FIGS. 3, 4, 22, and 23, a harness mounting structure that is connected to each sensor portion of the first case 28 or the second case 29 will be described. As shown in FIGS. 3, 4, 22, and 23, a single connector bracket body 131 is provided on the support base 87 on which the first case 28 or the second case 29 is disposed. A Γ-shaped vertical portion of the Γ-shaped connector bracket body 131 is fastened to the right wall surface of the support base 87 with a bolt 133. On the other hand, the Γ-shaped horizontal portion of the Γ-shaped connector bracket body 131 protrudes from the right wall surface of the support base 87 toward the outside of the machine. A plurality of harness connectors 132 are detachably fixed to the upper surface of the Γ-shaped horizontal portion of the connector bracket body 131.

  As shown in FIGS. 3, 4, 22, and 23, the harness connector 132 connected to the upstream gas temperature sensor 115, the harness connector 132 connected to the downstream gas temperature sensor 116, and the SCR gas temperature sensor 117 are connected. The harness connector 132 to be moved is disposed on the connector bracket body 131. That is, a plurality of harnesses connected to an exhaust gas temperature sensor (upstream gas temperature sensor 115, downstream gas temperature sensor 116, SCR gas temperature sensor 117) provided in the first case 28 or the second case 29, an exhaust gas pressure sensor, or the like. The connectors 132 are collectively arranged on the connector bracket body 131.

  In addition, each harness connector 132 is electrically connected to each temperature sensor 115, 116, 117 via each sensor harness 134, and an engine controller (not shown) is connected to each harness connector 132 via an external harness 135. The support base is attached to the engine via a plurality of support legs, and the connector bracket body is fixed to the outside surface of the support base.

  As shown in FIGS. 1 to 4, 22, and 23, a first case 28 that removes particulate matter in the exhaust gas of the diesel engine 1, and a first case that removes nitrogen oxides in the exhaust gas of the diesel engine 1. In an engine device including two cases 29 and connecting the second case 29 to the first case 28 via the urea mixing tube 39, a single connector bracket is provided on the support base 87 on which the first case 28 or the second case 29 is disposed. The body 131 is provided and connected to an exhaust gas temperature sensor (upstream gas temperature sensor 115, downstream gas temperature sensor 116, SCR gas temperature sensor 117) or an exhaust gas pressure sensor provided in the first case 28 or the second case 29. A plurality of harness connectors 132 are collectively arranged on the connector bracket body 131. Therefore, the plurality of harness connectors 132 can be collectively supported at a position where the sensor harness 134 does not contact the high temperature portion such as the diesel engine 1 or the first case 28 or the second case 29. The operation of joining or removing the sensor harness 134 during assembly or maintenance can be simplified.

  As shown in FIGS. 1 to 4, 22, and 23, a support base 87 is attached to the diesel engine 1 via a plurality of support legs (front support legs 82, side support legs 84, rear support legs 86). The connector bracket body 131 is fixed to the outside surface of the support base 87. Therefore, the connector bracket body 131 can be protruded and supported from the support base 87 toward the outside of the machine, and the high temperature of the connector bracket body 131 can be easily suppressed by utilizing the cooling air of the diesel engine 1. It is possible to easily prevent the harness connector 132 from being abnormally heated by heat conducted to the connector bracket body 131 from a high temperature portion such as the diesel engine 1 or the first case 28 or the second case 29, and the harness connector 132 or sensor. The durability of the harness 134 can be improved.

  As shown in FIGS. 1 to 4, 11, and 12, a support base 87 is provided on the upper surface side of the diesel engine 1 via a plurality of support legs (a front support leg 82, a side support leg 84, and a rear support leg 86). The first case 28, the second case 29, and the urea mixing tube 39 are fixed in parallel to the support frame body 98 to form an exhaust gas purification device 27 as an exhaust purification unit, and a support base An exhaust gas purification device 27 (support frame body 98) is detachably fixed to the upper surface side of 87. Accordingly, an air passage for heat insulation is formed between the diesel engine 1 and the exhaust gas purification device 27 (support base 87) while being able to support the exhaust gas purification device 27 in a stable posture on the diesel engine 1, High temperature of the support base 87 or the harness connector 132 can be suppressed, and the sensor harness 134 can be easily prevented from coming into contact with a high temperature part such as the diesel engine 1 or the first case 28 or the second case 29.

1 Diesel engine 27 Exhaust gas purification device (exhaust gas purification unit)
28 First case 29 Second case 39 Urea mixing pipe 82 Front support leg 84 Side support leg 86 Rear support leg 87 Support base 98 Support frame body 115 Upstream gas temperature sensor (exhaust gas temperature sensor)
116 Downstream gas temperature sensor (exhaust gas temperature sensor)
117 SCR gas temperature sensor (exhaust gas temperature sensor)
131 Connector bracket body 132 Harness connector 134 Sensor harness

Claims (3)

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,
A plurality of harness connectors provided with a single connector bracket body on a support base on which the first case or the second case is disposed, and connected to an exhaust gas temperature sensor or an exhaust gas pressure sensor provided in the first case or the second case An engine apparatus characterized in that the connector bracket body is collectively arranged.   2. The engine device according to claim 1, wherein the support base is attached to the engine via a plurality of support legs, and the connector bracket body is fixed to an outer surface of the support base.   The support base is attached to the upper surface side of the engine via a plurality of support legs, and the first case, the second case, and the urea mixing pipe are fixed in parallel to the support frame body, and an exhaust purification unit is provided. 2. The engine apparatus according to claim 1, wherein the exhaust gas purification unit is detachably fixed to the upper surface side of the support base.

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