combine

Abstract

To provide a combine that can compactly install an exhaust gas purification device.SOLUTION: A combine of the present invention includes an engine 14 mounted on a traveling body 1, an exhaust gas purification device 74 composed of a first case 75 for removing particulate matters in exhaust gas of the engine 14 and a second case 229 for removing nitrogen oxidizing substances in exhaust gas of the engine 14, an engine room 97 in which the engine 14 is installed, a grain removal device 5 for grain removal, and a grain tank 7 which is behind the engine room 97 and carries the grain removed by the grain removal device 5. The exhaust gas purification device 74 is arranged in a recess 7a facing the engine room 97 out of the grain tank 7. An exhaust connecting pipe 119 connecting the engine 14 and the exhaust gas purification device 74 is arranged below a frame 91 forming the engine room 97. An exhaust connecting pipe 119 communicates with an inlet pipe 81 provided in the exhaust gas purification device 74.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to combine harvesters such as a combine harvester that harvests stalks planted in a field and collects the grain, or a feed combine harvester that harvests stalks for feed and collects them as feed, and more specifically, to a combine harvester equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) contained in the exhaust gas of a diesel engine or the like, or nitrogen oxide substances (NOx) contained in the exhaust gas. [Background technology]

[0002] Conventionally, a technology has been known in which a case with a diesel particulate filter (hereinafter referred to as a DPF case) and a case with a urea selective catalytic reduction catalyst (hereinafter referred to as an SCR case) are provided as exhaust gas purification devices (exhaust gas aftertreatment devices) in the exhaust path of a diesel engine, and exhaust gas is introduced into the DPF case and the SCR case to purify the exhaust gas discharged from the diesel engine (see, for example, Patent Documents 1 to 3). Conventionally, a combine harvester is structured to cut uncut stalks in a field with a cutting blade device, transport the cut stalks to a threshing device with a stalk transport device for threshing, and collect grains in a grain tank, with an engine mounted on a traveling body and a DPF case disposed in a horizontal position on the upper surface side of the engine, and configured to discharge exhaust gas from the engine toward the DPF case (see, for example, Patent Document 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-74420 A [Patent Document 2] JP 2012-21505 A [Patent Document 3] JP 2012-177233 A [Patent Document 4] JP 2010-209813 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, in a structure in which the engine and the exhaust gas purification device (DPF case) are installed close to each other in the engine room, it is necessary to secure an installation space for the exhaust gas purification device (SCR case) around the engine mounting part, which causes problems such as limiting the engine room volume or the volume of the exhaust gas purification device (DPF case or SCR case). In addition, in a structure in which the exhaust gas purification device (DPF case or SCR case) is supported outside the engine room, the installation position of the urea mixing pipe that connects the SCR case to the DPF case, or the exhaust gas purification device, etc. is limited, which causes problems such as not being able to simplify the installation structure of the exhaust gas purification device. In addition, in a structure in which the exhaust gas purification device (DPF case or SCR case) is installed on the running body at a position away from the engine, such as a freight vehicle, the installation space for the exhaust gas purification device can be easily secured, but there is a problem in that the exhaust gas temperature in the exhaust gas purification device is likely to drop below a predetermined temperature.

[0005] Therefore, the present invention aims to provide a combine harvester that has been improved based on the current situation. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a combine harvester including an engine as a power source mounted on a traveling body, an exhaust gas purification device consisting of a first case for removing particulate matter in the exhaust gas of the engine and a second case for removing nitrogen oxide substances in the exhaust gas of the engine, an engine room in which the engine is installed, a threshing device for threshing grain, and a grain tank located behind the engine room and for carrying grain threshed by the threshing device, the grain tank having a recess facing the engine room, A part of the exhaust gas purification device overlaps with the grain tank in a plan view and a front view.An exhaust connecting pipe connecting the engine and the exhaust gas purification device is arranged below a frame forming the engine compartment, and an inlet pipe provided in the exhaust gas purification device is connected to the exhaust connecting pipe.

[0007] In the above combine, the first case and the second case may be arranged so that their respective longitudinal directions run along the front-to-rear direction of travel of the traveling body, and the inlet pipe may be provided at a location on the first case opposite the engine.

[0008] In the above combine harvester, the inlet pipe may be arranged on a lower surface side of the first case. Effect of the Invention

[0009] According to the present invention, the grain tank is provided with a recess facing the engine room. A part of the exhaust gas purification device overlaps with the grain tank in a plan view and a front view. An exhaust manifold that connects the engine and the exhaust gas purifying device is disposed below the frame that forms the engine room, and an inlet pipe provided in the exhaust gas purifying device is connected to the exhaust manifold, so that the engine and the exhaust gas purifying device can be configured with a short path between the grain tank and the engine room, and exhaust heat from the engine can be guided to the exhaust gas purifying device, thereby maintaining a high purification effect in the exhaust gas purifying device. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a left side view of a six-row combine harvester showing an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 2 is a front perspective view showing the configuration inside the engine compartment. [Diagram 5] FIG. 2 is a perspective view showing the positional relationship between the engine peripheral parts, the grain tank, and the thresher. [Figure 6] 1 is an external perspective view showing an engine and an exhaust gas purification device; [Figure 7] FIG. 2 is a rear perspective view of the exhaust gas purification device mounting portion. [Figure 8] FIG. 2 is a right side view showing a portion of the threshing apparatus. [Figure 9] FIG. [Figure 10] FIG. 1 is a perspective view showing the arrangement of parts on a traveling body in a combine harvester according to a first embodiment. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 1 is a plan view of a combine harvester according to a second embodiment. [Figure 14] FIG. [Figure 15] FIG. 2 is a front view of the urea water tank in the combine harvester. [Figure 16] FIG. [Figure 17] FIG. 11 is a perspective view showing the arrangement of each part in a combine harvester according to a third embodiment. [Figure 18] FIG. 2 is a left side view showing the inside of the threshing device of the combine harvester. [Figure 19] FIG. 11 is a perspective view showing the arrangement of parts on a traveling body in a combine harvester according to a fourth embodiment. [Figure 20] FIG. [Figure 21] FIG. 13 is a diagram showing a modified example of the urea water tank in the combine harvester. [Figure 22] FIG. 11 is a perspective view showing the arrangement of parts on a traveling body in a combine harvester according to a fifth embodiment. [Figure 23] FIG. 2 is a front view of the fuel tank and urea solution tank of the combine harvester (left side view of the combine harvester). [Figure 24] FIG. 11 is a front view (left side view of the combine harvester) showing a first modified example of the fuel tank and the urea water tank of the combine harvester. [Diagram 25] FIG. 25 is a side view showing the configuration of the fuel tank and the urea water tank shown in FIG. 24. [Figure 26] FIG. 25 is a side view showing a configuration when the fuel tank and the urea water tank shown in FIG. 24 are separated. [Figure 27] FIG. 11 is a front view (left side view of the combine harvester) showing a second modified example of the fuel tank and the urea water tank of the combine harvester. [Figure 28] FIG. 28 is a side view showing the configuration of the fuel tank and the urea water tank shown in FIG. 27. [Figure 29] 28 is a front view showing a state in which the urea water tank shown in FIG. 27 is filled with urea water. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <First embodiment> A first embodiment of the present invention will be described below with reference to Figs. 1 to 12. The overall structure of a combine harvester according to an embodiment equipped with a diesel engine will be described with reference to Figs. 1 to 3. In the following description, the left side of the traveling body 1 in the forward direction will be simply referred to as the left side, and the right side in the forward direction will be simply referred to as the right side. As shown in Figs. 1 to 3, the traveling body 1 is supported by a pair of left and right traveling crawlers 2 as a traveling part. A 6-row harvesting reaper 3 that harvests and collects stalks is mounted on the front of the traveling body 1 so that it can be adjusted up and down around a reaping rotation fulcrum shaft 4a by a single-acting lifting hydraulic cylinder 4. A threshing device 5 having a feed chain 6 and a grain tank (grain tank) 7 for storing grains taken out from the threshing device 5 are mounted side by side on the traveling body 1. The threshing device 5 is disposed on the left side of the traveling body 1, and the grain tank 7 is disposed on the right side of the traveling body 1.

[0012] A rotatable grain discharge conveyor 8 is provided at the rear of the traveling machine body 1 via a vertical take-out conveyor 8a, and grains inside the grain tank 7 are discharged from a rice husk throwing port 9 of the grain discharge conveyor 8 into a truck bed or a container. A driver's cabin 10 is provided on the right side of the harvesting device 3 and in front of the grain tank 7. A cabin rotation fulcrum shaft 10a is provided at the lower front side of the driver's cabin 10, and the lower front side of the driver's cabin 10 is rotatably supported on the traveling machine body 1 via the cabin rotation fulcrum shaft 10a, and the driver's cabin 10 is movably installed toward the outside of the machine front side, and is configured to rotate forward around the cabin rotation fulcrum shaft 10a.

[0013] Arranged within the driver's cabin 10 are a steering wheel 11, a driver's seat 12, a main speed change lever 15, an auxiliary speed change lever 16, a threshing clutch lever 17 for turning the threshing clutch on and off, and a reaping clutch lever 18 for turning the reaping clutch on and off. A diesel engine 14 serving as a power source is disposed in the traveling machine body 1 below the driver's seat 12. The driver's cabin 10 is also provided with a step for an operator to board, a steering column provided with the steering wheel 11, a lever column provided with the levers 15, 16, 17, 18, and the like.

[0014] As shown in Fig. 1, left and right track frames 21 are arranged on the underside of the traveling body 1. The track frame 21 is provided with a drive sprocket 22 that transmits the power of the engine 14 to the traveling crawler 2, a tension roller 23 that maintains the tension of the traveling crawler 2, a number of track rollers 24 that keep the grounded side of the traveling crawler 2 in a grounded state, and an intermediate roller 25 that holds the non-grounded side of the traveling crawler 2. The front side of the traveling crawler 2 is supported by the drive sprocket 22, the rear side of the traveling crawler 2 is supported by the tension roller 23, the grounded side of the traveling crawler 2 is supported by the track roller 24, and the non-grounded side of the traveling crawler 2 is supported by the intermediate roller 25.

[0015] 1 and 2, the fuel tank 31 that stores the fuel to be supplied to the engine 14 is disposed at the rear left side of the traveling body 1, and is configured so that diesel fuel can be replenished into the fuel tank 31 from the outside of the machine on the left side of the threshing device 5. That is, the fuel tank 31 is installed on the traveling body 1 at a position below the straw discharge cutter 65 at the rear of the threshing device 5, and the fuel supply port 32 (see FIG. 8) is extended to the left side of the threshing device 5, making it possible to refuel from the outside of the machine.

[0016] As shown in Figs. 1 and 2, a cutting frame 51 connected to the cutting pivot shaft 4a of the harvesting device 3 is provided with a clipper-type cutting blade device 52 for cutting the base of uncut culms planted in the field. A six-row culm lifting device 53 for lifting the uncut culms planted in the field is disposed in front of the harvesting frame 51. A culm transport device 54 for transporting the harvested culms harvested by the cutting blade device 52 is disposed between the culm lifting device 53 and the front end (feed start end side) of the feed chain 6. In addition, a six-row grass dividing body 55 for dividing the uncut culms is protrudingly disposed in front of the lower part of the culm lifting device 53. The harvesting device 3 is configured to continuously harvest the uncut culms planted in the field while moving in the field.

[0017] Next, the structure of the threshing device 5 will be described with reference to Figures 1 and 2. As shown in Figures 1 and 2, the threshing device 5 is equipped with a threshing drum 56 for threshing stumps, a swinging sorting plate 57 and a winnowing fan 58 for sorting the threshed grains that fall below the threshing drum 56, a processing drum 59 for reprocessing the threshing waste taken out from the rear of the threshing drum 56, and a dust discharge fan 60 for discharging the dust from the rear of the swinging sorting plate 57. The stumps transported by the stump transport device 54 from the harvesting device 3 are passed on to the feed chain 6 and carried into the threshing device 5 where they are threshed by the threshing drum 56.

[0018] As shown in FIG. 1, below the oscillating sorting board 57, there is a first conveyor 61 for removing the grains (first grains) selected by the oscillating sorting board 57, and a second conveyor 6 for removing the second grains such as grains with stalks. 2. The oscillating sorting plate 57 is configured so that the separated grains that have fallen through a receiving net 67 stretched below the handling drum 56 are subjected to oscillating sorting (specific gravity sorting) by a feed pan 68 and a chaff sieve 69. The grains that have fallen from the oscillating sorting plate 57 have dust within them removed by sorting wind from a winnowing fan 58, and then fall onto the first conveyor 61. The grains removed from the first conveyor 61 are carried into the grain tank 7 via the lifting conveyor 63, and are collected in the grain tank 7.

[0019] As shown in Fig. 1, the oscillating sorting plate 57 is configured to drop second grains such as grains with stalks from the chaff sieve 69 onto the second conveyor 62 by oscillating sorting. A sorting fan 71 is provided to wind-screen the second grains that fall below the chaff sieve 69. The second grains that fall from the chaff sieve 69 have dust and straw removed from them by the sorting wind from the sorting fan 71, and then fall onto the second conveyor 62. The terminal end of the second conveyor 62 is connected to the upper side of the feed pan 68 via the return conveyor 66, and is configured to return the second grains to the upper side of the oscillating sorting plate 67 for re-sorting.

[0020] 1 and 2, a straw discharge chain 64 and a straw discharge cutter 65 are disposed at the rear end (feed end) of the feed chain 6. The straw (culms from which grains have been threshed) passed from the rear end of the feed chain 6 to the straw discharge chain 64 is discharged in a long state behind the traveling body 1, or is cut to an appropriate length by the straw discharge cutter 65 provided at the rear of the threshing device 5 and then discharged below the rear of the traveling body 1.

[0021] As shown in Figures 4 and 5, the grain tank 7 has a purification device installation recess 7a with a cutout shape on the left side of the front, a grain discharge conveyor installation recess 7b with a groove shape in the front-rear direction on the left side of the top surface, and a grain lifting conveyor installation recess 7c with a step shape in the up-down direction in the center of the left side surface. A space is provided behind the engine room 97 in the purification device installation recess 7a on the front side of the grain tank 7, and an exhaust gas purification device 74 is placed therein. The grain discharge conveyor installation recess 7b on the top surface of the grain tank 7 accommodates the grain discharge conveyor 8 with its tip housed in the conveyor support along the grain discharge conveyor installation recess 7b. Furthermore, the grain lifting conveyor 63 is fixed along the grain lifting conveyor installation recess 7c on the left side of the grain tank 7, and is connected by a receiving port provided at the top of the grain lifting conveyor installation recess 7c.

[0022] As shown in Figures 3, 10 and 11, the grain discharge conveyor 8 is rotatably supported on the upper end side of the vertical take-out conveyor (vertical feed conveyor) 8a, and a rice dumping port 9 is provided at the feed end side of the grain discharge conveyor 8. A horizontal feed conveyor 8b is arranged in the front-rear direction at the bottom of the grain tank 7, and the lower end (base end) side of the vertical take-out conveyor 8a is connected to the rear end of the horizontal feed conveyor 8b. In addition, an outer bottom plate 7a and an inner bottom plate (not shown) are provided at the bottom of the grain tank 7, and the outer bottom plate 7a and the inner bottom plate are inclined toward the horizontal feed conveyor 8b, so that the grains inside the grain tank 7 flow down in the direction of the horizontal feed conveyor 8b. The horizontal feed conveyor 8b is extended along the front and rear of the bottom of the grain tank 7, and transports the grains flowing down along the bottom plate of the grain tank 7 to the rear vertical take-out conveyor 8a.

[0023] The vertical take-out conveyor 8a is connected to the rear end of the horizontal feed conveyor 8b protruding from the rear end face of the grain tank 7, and is extended toward the top of the grain tank 7 along the rear end face of the grain tank 7. The vertical take-out conveyor 8a is erected behind the grain tank 7 by connecting the lower end (base end) side to the horizontal feed conveyor 8b, while the upper part is fixed to the rear end face of the grain tank 7. Furthermore, the lower end of the vertical take-out conveyor 8a is supported on the traveling machine body 1, so that the grain tank 7 can be moved laterally toward the outside of the machine around the axis of the vertical take-out conveyor 8a, and the right side of the threshing device 5 and the rear of the engine room 97 can be opened. In addition, a rear cover 30 that covers the periphery of the vertical take-out conveyor 8a is removably provided behind the grain tank 7, and a bottom cover body 165 is removably provided on the outer surface of the machine-exterior bottom plate 7a of the grain tank 7.

[0024] Next, with reference to Figs. 4 to 7, a first case 75 (diesel particulate filter, DPF) and a second case 229 (selective catalytic reduction, SCR) as the exhaust gas purification device 74, and the diesel engine 14 will be described. The first case 75 as a diesel particulate filter (DPF) that removes particulate matter in the exhaust gas of the diesel engine 14, and the second case 229 as a urea selective catalytic reduction (SCR) system that removes nitrogen oxide substances in the exhaust gas of the diesel engine 14 are provided. As shown in Fig. 5, an oxidation catalyst 79 and a soot filter 80 are provided inside the first case 75. As shown in Fig. 7, an SCR catalyst 232 for urea selective catalytic reduction and an oxidation catalyst 233 are provided inside the second case 229.

[0025] The first case 75 has an inlet case 76 and an outlet case 77. Inside the inlet case 76, a diesel oxidation catalyst 79 made of platinum or the like that generates nitrogen dioxide (NO2) is arranged. Inside the inlet case 76 and the outlet case 77, a honeycomb-structured soot filter 80 that continuously oxidizes and removes collected particulate matter (PM) at a relatively low temperature is arranged. The diesel oxidation catalyst 79 and the soot filter 80 arranged in series in the inlet case 76 and the outlet case 77 in the moving direction of the exhaust gas not only remove particulate matter (PM) in the exhaust gas of the diesel engine 14, but also reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. Meanwhile, an SCR catalyst 232 and an oxidation catalyst 233 are arranged in series in the moving direction of the exhaust gas in the second case 229. The SCR catalyst 232 and the oxidation catalyst 233 in the second case 229 are configured to reduce nitrogen oxides (NOx).

[0026] 4 to 7, the first case 75 and the second case 229 are configured in a long cylindrical shape extending long in the front-rear direction of the aircraft body. A purification inlet pipe 81 that takes in exhaust gas and a purification outlet pipe 82 that discharges exhaust gas are provided on both sides of the cylindrical shape of the first case 75 (one end side and the other end side in the exhaust gas movement direction). Similarly, an SCR inlet pipe 236 that takes in exhaust gas and an SCR outlet pipe 237 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).

[0027] 4 to 7, a turbocharger 118 for forcibly feeding air into the diesel engine 14 is disposed at the exhaust gas outlet (exhaust manifold 117) of the diesel engine 14. The purification inlet pipe 81 is connected to the exhaust gas outlet side of the turbocharger 118 via an exhaust connecting pipe 119, and the exhaust gas of the diesel engine 14 is introduced into the first case 75. A urea mixing pipe 239 for connecting the SCR inlet pipe 236 is connected to the purification outlet pipe 82, and exhaust gas is introduced from the first case 75 into the second case 229 via the urea mixing pipe 239. In addition, the exhaust gas outlet side of the turbocharger 118 and the exhaust connecting pipe 119 are connected by a bellows-shaped connecting pipe 98 that can be bent and expanded, and configured so that vibration of the engine 14 on the turbocharger 118 side is not transmitted to the exhaust connecting pipe 119 side.

[0028] Meanwhile, the purification outlet pipe 82 and the urea water injection part 240 of the urea mixing pipe 239 are detachably fastened by bolts to a pipe flange. The inlet side case 76 and the outlet side case 77 are detachably connected by bolting a plurality of sets of thick plate-shaped intermediate flange bodies 84, and the outlet side case 77 can be separated to perform disassembly maintenance of the soot filter 80. Also, the tail pipe 83 is connected to the SCR outlet pipe 237, and an exhaust gas outlet of the tail pipe 83 is opened toward the upper side of the aircraft body. The exhaust gas of the diesel engine 14 (each cylinder) is introduced from the turbocharger 118 into the first case 75, moves from the first case 75 to the urea mixing pipe 239, and the urea water in the urea water tank 174 described later is mixed with the exhaust gas, and the exhaust gas is introduced into the second case 229 and discharged from the tail pipe 83 to the outside of the aircraft.

[0029] With the above-mentioned configuration, particulate matter (PM) contained in the exhaust gas of the diesel engine 14 is captured by the soot filter 80 in the first case 75 and is continuously oxidized and removed by nitrogen dioxide (NO2). In addition to removing particulate matter (PM) from the exhaust gas of the diesel engine 14, the content of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 14 is reduced. Next, inside the urea mixing pipe 239, urea water is injected from the urea water injection nozzle body of the urea water injection unit 240 into the exhaust gas from the diesel engine 14, and the exhaust gas in the second case 229 mixed with ammonia generated by hydrolysis has the content of nitrogen oxides (NOx) reduced by the SCR catalyst 232 for urea selective catalytic reduction and the oxidation catalyst 233. The exhaust gas of the diesel engine 14 is purified in the first case 75 and the second case 229 and is discharged outside the aircraft from the tail pipe 83.

[0030] 4 and 6, an engine room frame 91 is erected as a machine frame on the traveling machine body 1 in front of the grain tank 7, and an engine room 97 is formed by the engine room frame 91. The diesel engine 14 is mounted on the upper surface side of the traveling machine body 1, and is installed inside the engine room 97. In addition, cooling parts such as a water-cooled radiator (not shown) and a cooling fan 115 are installed inside the engine room 97 on the side of the diesel engine 14. The cooling fan 115 is configured to take in outside air from the outside right side of the combine machine body toward cooling parts such as the radiator (not shown), while discharging warm air from the diesel engine 14 toward the threshing device 5 side.

[0031] In addition, the right side, rear side and top side of the diesel engine 14 and cooling parts are surrounded by the engine room frame 91, and the cooling fan 115 of the diesel engine 14 draws in outside air for cooling into the engine room 97 from the outside right side of the engine room frame 91, while the warm air after cooling the diesel engine 14 and cooling parts is discharged toward the right side of the threshing device 5, which serves as the working part adjacent to the engine room frame 91 (engine room 97).

[0032] The engine room frame 91 has a left square pipe-shaped support body 92, a right inverted U-shaped support body 93, and a square pipe-shaped horizontal frame 94 whose both ends are integrally fixed to the left and right support bodies 92, 93. One end of the square pipe-shaped horizontal frame 94 is connected to the upper end of the square pipe-shaped support body 92, while the other end is connected and fixed to a square pipe-shaped frame 93a fixed above the inverted U-shaped support body 93.

[0033] In addition, rubber pressure-welding legs (not shown) provided at the rear bottom surface of the driver's cabin 10 abut from above against the upper surfaces of the left and right receiving pedestals 96 of the horizontal frame 94, so that the rear part of the driver's cabin 10 is supported on each receiving pedestal 96 of the horizontal frame 94 so that it can be moved toward and away from the respective receiving pedestals 96 in the vertical direction. The diesel engine 14 is installed inside an engine room 97 formed by the bottom side of the driver's cabin 10 and the engine room frame 91. As shown in Figure 4, a conveyor support 90 is provided on the upper end side of the left support body 92, and the grain discharge conveyor 8 is supported in the stored position via the conveyor support 90.

[0034] Furthermore, there is provided an air cleaner 123 which supplies outside air to the diesel engine 14, and a pre-cleaner 124 which takes in outside air to the air cleaner 123. The air cleaner 123 is disposed on the upper surface of the engine room 97 to the right of the exhaust gas purification device 74, and the pre-cleaner 124 is disposed on the front right side of the grain tank 7 and above the engine room 94, and the air cleaner 123 is connected to the pre-cleaner 124 via an air intake pipe 125. Combustion air is taken in from the pre-cleaner 124 via the air cleaner 123 to the compressor case 118a of the turbocharger 118 of the diesel engine 14. The air cleaner 123 is fixed to the right side of the rear surface of the horizontal frame 94 of the engine room frame 91, and is therefore located on the front right side of the exhaust gas purification device 74.

[0035] As shown in Figures 4 to 6, the turbocharger 118 is installed above the front side of the diesel engine 14, and a compressor case 118a incorporating a blower wheel is provided on the right side thereof, while a turbine case 118b incorporating a turbine wheel is provided on the left side thereof. The intake side provided at the right end of the compressor 118a communicates with the intake and exhaust side of the air cleaner 123 via an intake pipe 120. Meanwhile, an exhaust outlet pipe 99 provided at the left end of the turbine case 118b is connected, via a bendable bellows-shaped exhaust introduction pipe 98, to an exhaust connecting pipe 119 connected to an exhaust gas inlet (purification inlet pipe 81) of the exhaust gas purification device 74, which is an aftertreatment device.

[0036] 3 to 6, the exhaust gas purification device 74 including the first case 75 and the second case 229, the air cleaner 123, and the precleaner 124 are arranged on the left and right sides of the engine 14 behind the engine room frame 91. That is, the air cleaner 123 and the precleaner 124 which form the intake system are arranged on the right compressor case 118a side of the turbocharger 118 in front of the engine 14, while the exhaust gas purification device 74 which forms the exhaust system is arranged on the left turbine case 119b side. Therefore, since the intake path and the exhaust path of the engine 14 including the turbocharger 118 are arranged on the left and right sides, the intake path and the exhaust path can be configured as short paths, and the intake path can be arranged away from the exhaust path through which high-temperature exhaust gas passes.

[0037] Next, the mounting structure and support structure of the exhaust gas purification device 74 will be described with reference to Fig. 4 to Fig. 7. The exhaust gas purification device 74 is configured as a unit by connecting a first case (DPF) 75 and a second case (SCR) 229 in parallel with a case fixed body 231. On the case fixed body 231, the first case 75 is detachably fixed with a plurality of fastening bands 85, and the second case 229 is detachably fixed with a plurality of fastening bands 230. That is, by fastening both ends of each of the plurality of fastening bands 85, 230 to the case fixed body 231 with bolts, the first case 75 and the second case 229 are arranged side by side on the case fixed body 231 so as to be parallel to each other.

[0038] The exhaust gas purification device 74 is supported on the traveling body 1 by fixing the case fixing body 231, on whose upper surface the first case 75 and the second case 229 are mounted, to the support base 250. As shown in Figs. 4 to 7, the support base 250 is disposed below the purification device installation recess 7a provided on the front left side (thresher 5 side) of the grain tank 7, and supports the exhaust gas purification device 74 from the engine room 97 to the purification device installation recess 7a. As shown in Figs. 5 to 7, the left edge of the support base 250 is fixed to the right side of the machine frame of the thresher 5, the front side is fixed to the engine room frame 94, and the right edge is fixed to a support frame 251 erected from the traveling body 1, so that the support base 250 is supported at an upper position in the recess 7a of the grain tank 7.

[0039] As shown in Figures 4 and 6, the front side of the support platform 250 is supported by the engine room frame 91 by connecting one end of a bridge frame 252, the other end of which is fixed to the back surface of the support platform 250, to a horizontal frame 94 of the engine room frame 91. Also, as shown in Figure 5, the left edge of the support platform 250 is supported by the right side of the threshing device 5 by connecting it to the right side of the top surface of the threshing device 5 (the threshing upper surface frame at the upper right side of the threshing machine case) via an assembly adjustment frame 253. Furthermore, as shown in Figure 7, the right edge of the support platform 250 is supported on the support frame 251 by connecting it to the upper end of the support frame 251 via a horizontal crosspiece frame 254.

[0040] 4 and 5, the bridging frame 252 is extended from the support base 250 toward the horizontal frame 94 at a position between the air cleaner 123 and the purification inlet pipe 81. This not only ensures a space for connecting the bellows-shaped exhaust introduction pipe 98 arranged below the horizontal frame 94 and the purification inlet pipe 91 of the first case 75, but also prevents interference with the air cleaner 123. Furthermore, since the bridging frame 252 is arranged at a position between the intake path including the air cleaner 123 and the exhaust path connected to the first case 75, the effect of exhaust heat from the exhaust path on the air cleaner 123 can be reduced.

[0041] As shown in Figures 4 to 7, the grain tank 7 has a purifier installation recess 7a on the surface facing the engine room 97, and an exhaust gas purifier 74 consisting of a first case 75 and a second case 229 is disposed in the recess 7a of the grain tank 7. This allows the exhaust gas purifier 74 to be disposed in a position close to the engine 14 between the grain tank 7 and the engine room 97, while preventing an operator from coming into contact with the exhaust gas purifier 74, which becomes hot. In addition, since the exhaust heat from the engine room 97 can be guided to the exhaust gas purifier 74, the exhaust gas purifier 74 can be disposed in a high-temperature environment required for purifying the exhaust gas, and a high purification effect can be maintained in the exhaust gas purifier 74.

[0042] At this time, as shown in Figures 4 to 7, the first case 75 and the second case 229 are supported horizontally from the threshing device 5 to the recess 7a of the grain tank 7, and the first case 75 and the second case 229 are arranged in parallel. By supporting the first case 75 and the second case 229 horizontally, the exhaust gas purification device 74 can be arranged compactly at a position higher than the engine 14, and a structure can be achieved that makes it easy to guide high-temperature exhaust gas from the engine 14 to the exhaust gas purification device 74. In addition, by arranging the exhaust gas purification device 74 at a high position, it is possible to prevent water generated by condensation due to a drop in temperature when the engine 14 is stopped from accumulating in the exhaust gas purification device 74.

[0043] As shown in Fig. 4 to Fig. 7, the first case 75 and the second case 229 of the exhaust gas purification device 74 are connected in parallel by the case fixing body 231, and the exhaust inlet of the second case 229 is connected to the exhaust outlet of the first case 75 via the urea mixing pipe 239, and the urea mixing pipe 239 is arranged between the first and second cases 75, 229 in parallel with each of the first and second cases 75, 229. As a result, the first and second cases and the urea mixing pipe are configured as an integrated unit structure, and the exhaust gas purification device 74 can be installed compactly inside the recess 7a in front of the grain tank 7. Therefore, while the installation space for the exhaust gas purification device 74 can be easily secured, the recess 7a of the grain tank 7 can be configured narrow to secure the grain storage capacity of the grain tank 7.

[0044] The first and second cases 75, 229 of the exhaust gas purification device 74 are arranged side by side with the longitudinal direction of each case being the front-rear direction, and the first case 75 is arranged on the threshing device 5 side. By arranging the first case 75 on the threshing device 5 side and arranging the second case 229 on the rear side of the recess 7a of the grain tank 7, the second case 229 and the urea mixing pipe 239 can be arranged so as to be covered by the grain tank 7, and the first case 75 can be arranged in a position close to the exhaust port of the engine 14. Therefore, the exhaust path from the engine 14 to the first case 75 is configured as a short path, and the regeneration process in the first case 75 can be maintained at a high performance. In addition, the second case 229 and the urea mixing pipe 239 can be arranged in a high-temperature environment surrounded by the grain tank 7 behind the engine room 97, which prevents the urea water from freezing and maintains a high purification capacity in the second case 229.

[0045] 7 to 12, the system includes a urea water tank 174 for storing urea water (urea water solution for selective catalytic reduction), and a urea water supply device 175 for supplying urea water to a urea water injection section 240 of the urea mixing tube 239. The urea water supply device 175 supplies urea water in the urea water tank 174 to the urea water injection section 240 of the urea mixing tube 239, causing the urea water to be sprayed into the urea mixing tube 239 from a urea water injection valve 178 of the urea water injection section 240.

[0046] 9, the urea water supply device 175 includes a urea water pump 171 that pumps and delivers the urea water solution in a urea water tank 174, and a urea water supply electric motor 172 that drives the urea water pump 171. The urea water supply device 175 is connected to a urea water injection valve 178 of the urea injection unit 240 via a urea water injection pipe 177, and is connected to the urea water tank 174 by a urea water supply pipe 179 and a urea water return pipe 180. The urea water supply device 175 also includes an engine controller 181 that executes fuel injection control of the diesel engine 14, and a urea injection controller 182 that controls the urea water supply device 175 or the urea water injection valve 178.

[0047] A urea water injection valve 178 is attached to the urea injection portion 240 of the urea mixing pipe 239, and urea water solution is sprayed from the urea water injection valve 178 into the inside of the urea mixing pipe 239. The urea water supplied into the urea mixing pipe 239 is mixed as ammonia in the exhaust gas flowing from the first case 75 to the second case 229. A urea injection controller 182 is connected to a urea water temperature sensor 183 of the urea water tank 174 and a urea water amount sensor 184 of the urea water tank 174, and the engine controller 181 and the urea injection controller 182 are also connected to the urea water, so that the urea water is supplied into the urea mixing pipe 239 at an appropriate time depending on the operating conditions of the diesel engine 14, etc.

[0048] First, a description will be given of the mounting structure of the urea water supply device 175. As shown in Fig. 7 and Fig. 8, the urea water supply device 175 is disposed at a height position between the threshing device 5 and the grain tank 7 and below the exhaust gas purification device 74. That is, the urea water supplying device 175 is fixed at a position lower than the urea water injector 178. Therefore, after the injection of urea water is stopped, the urea water remaining in the urea water injection pipe 177 and the like can be returned to the urea water supplying device 175 due to the height difference between the urea water supplying device 175 and the urea water injector 178.

[0049] 10 and 12, the exhaust gas purification device 74 is installed between the threshing device 5 and the grain tank 7 behind the engine compartment 97, and the urea water supply device 175 that supplies urea water to the exhaust gas purification device 74 is provided below the exhaust gas purification device 74. Therefore, since the exhaust gas purification device 74 and the urea water supply device 175 can be disposed behind the engine compartment 97, the exhaust heat from the engine 14 can be used to prevent the urea water from freezing, and deterioration in the quality of the urea water can be suppressed.

[0050] 10 and 12, the exhaust gas purification device 74 is disposed at a position sandwiched between the engine room 97 and the grain tank 7, and the urea water supply device 175 is disposed at a position sandwiched between the grain tank 7 and the threshing device 5. By disposing the exhaust gas purification device 74 and the urea water supply device 175 by effectively utilizing the space around the grain tank 7, the capacity of the grain tank 7 can be secured. In addition, because the exhaust gas purification device 74 and the urea water supply device 175 can be disposed at a short distance, the urea water piping (urea water injection pipe 177) connecting the exhaust gas purification device 74 and the urea water supply device 175 can be configured to be short.

[0051] As shown in Fig. 7 and Fig. 8, the urea water supplying device 175 is fixed to the right side (grain tank 7 side) of the threshing device 5 in an area sandwiched between the grain lifting conveyor 63 and the return conveyor 66. This allows the urea water supplying device 175 to be disposed near the exhaust gas purification device 74 located in front of the grain tank 7 adjacent to the threshing device 5, so that the urea water piping (urea water injection pipe 177) connecting the urea water tank 174 to the urea water injection unit 240 can be configured to be short. In addition, the exhaust gas purification device 74 and the urea water supplying device 175 can be disposed in the flow path of exhaust air formed between the threshing device 5 and the grain tank 7 behind the engine room 97. This allows the SCR system to operate under an optimal temperature environment, for example by preventing the urea water from freezing.

[0052] 7 and 8, in this embodiment, the urea water supplying device 175 is fixed to a position forward of the lifting conveyor 63 and below the return conveyor 66. That is, the urea water supplying device 175 is fixed to the right side surface of the threshing device 5, and disposed below the return conveyor 66 and between the winnowing fan 58 and the first conveyor 61. That is, the urea water supplying device 175 is disposed at a position surrounded by the lifting conveyor 63 and the return conveyor 66, which intersect with each other, and the cover body 58a that covers the right suction port of the winnowing fan 58.

[0053] On the other hand, the grain tank 7 is installed without any interference with the grain lifting conveyor 63 and the return conveyor 66. Therefore, by arranging the urea water supplying device 175 in the area surrounded by the grain lifting conveyor 63 and the return conveyor 66, the urea water supplying device 175 can be fixed to the side of the threshing device 5 without any interference with the grain tank 7, and the shape of the grain tank 7 does not need to be changed, and the capacity of the grain tank 7 can be secured.

[0054] Next, a modified example of the installation position of the urea water supply device 175, which is placed in the area between the grain lifting conveyor 63 and the return conveyor 66, will be described with reference to Fig. 8. As shown in Fig. 8, the urea water supply device 175 may be installed in front of the grain lifting conveyor 63 and below the return conveyor 66, and by placing it at the same height as the discharge outlet of the grain lifting conveyor 63 as shown by the imaginary line, it is placed at a height below the exhaust gas purification device 74.

[0055] 8, the urea water supplying device 175 may be installed behind the lifting conveyor 63, either above or below the return conveyor 66. Furthermore, in a case where the lifting conveyor 63 and the return conveyor 66 are installed side by side without crossing each other on the right side of the threshing device 5, the urea water supplying device 175 may be installed between the lifting conveyor 63 and the return conveyor 66.

[0056] Next, the mounting structure of the urea water tank 174 will be described with reference to Figs. 10 to 12. As shown in Figs. 10 to 12, the urea water tank 174 is disposed behind the grain tank 7, while the fuel tank 31 is disposed behind the threshing machine. The fuel supply port 32 of the fuel tank 31 protrudes toward the left side, while the water supply port 174a of the urea water tank 174 protrudes toward the right side. Specifically, the urea water tank 174 has the water supply port 174a provided from the outside of the machine toward the rear (diagonally rear right), and is disposed vertically between the vertical take-out conveyor 8a and the rear cover 30. The water supply port 174a protrudes from an opening (not shown) of the rear cover 30, and is configured to be accessible to the water supply port 174a from outside the machine.

[0057] As shown in Figures 10 to 12, the urea water tank 174 is disposed vertically with its lengthwise direction being the up-down direction, and is fixed to the underside of the right edge (outer edge) of the rear end face of the grain tank 7. Since the water supply port 174a protrudes toward the right side opposite the fuel supply port 32 facing toward the left side of the traveling body 1, it is possible to prevent erroneous determination between the fuel supply port 32 and the water supply port 174a when performing fuel supply work to the fuel tank 31 or water supply work to the urea water tank 174. Furthermore, since the water supply port 174a protrudes diagonally backward, it is possible to reduce the amount of wrapping around of the water supply hose from the fuel supply port 32 to the water supply port 174a, and it is possible to perform fuel supply work and water supply work simultaneously.

[0058] As shown in Figures 10 and 11, a urea water tank 174 is disposed vertically around the vertical take-out conveyor (vertical feed conveyor) 8a behind the grain tank 7. The urea water tank 174 is disposed inside the rear cover 30, and is arranged parallel to the vertical take-out conveyor 8a. As shown in Figures 10 and 12, the urea water tank 174 is connected to a urea water supply device 175 disposed on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 that are arranged between the threshing device 5 and the grain tank 7. In other words, the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank can be disposed by utilizing the space around the grain tank 7, so that the capacity of the grain tank 7 can be secured.

[0059] 10 and 12, the exhaust gas purification device 74 is disposed around the front of the grain tank 7, the urea water supply device 175 is disposed to the side of the grain tank 7, and the urea water tank 174 is disposed behind the grain tank 7. In other words, since the urea water supply device 175 is disposed between the exhaust gas purification device 74 and the urea water tank 174, the urea water piping 177, 179, 180 from the urea water tank 174 to the exhaust gas purification device 74 can be configured to be short.

[0060] As shown in FIG. 12, the grain tank 7 is supported at its rear on the vertical take-out conveyor 8a and is configured to be movable laterally toward the outside of the machine around the axis of the vertical take-out conveyor 8a. The grain tank 7 is rotated toward the outside of the machine vertically around the vertical rotation axis of the vertical take-out conveyor 8a, so that the right side of the threshing device 5 and the rear of the engine room 97 can be opened. Since the urea water tank 174 is installed around the vertical take-out conveyor 8a, the connection portion with the urea water supply pipe 179 and the urea water return pipe 180 can be disposed near the rotation fulcrum of the grain tank 7. The urea water supply pipe 179 and the urea water return pipe 180 are arranged from the left side of the grain tank 7 to bypass the rear of the grain tank 7. Therefore, when the grain tank 7 is opened, the piping distance from the urea water tank 174 to the urea water supply device 175 is shorter than when the grain tank 7 is stored, and the difference in piping distance due to the opening and closing of the grain tank 7 can be reduced.

[0061] Furthermore, when the grain tank 7 is opened by moving it laterally, the exhaust gas purification device 74 and the urea water supply device 175 at the rear of the engine compartment 97 can be easily accessed, whereas when the grain tank 7 is stored, the exhaust gas purification device 74 and the urea water supply device 175 cannot be accessed. Therefore, when the grain tank 7 is stored, it is not possible to come into contact with the exhaust gas purification device 74, which becomes hot during operation, and therefore the safety of the worker can be ensured, and the grain tank 7 can be opened to easily access the exhaust gas purification device 74 and the urea water supply device 175 during various work such as maintenance.

[0062] <Second embodiment> Next, a second embodiment of the present invention will be described with reference to Figures 13 to 16. Note that the combine harvester in this embodiment differs from the first embodiment in that the urea water tank 174 is disposed horizontally below the grain tank 7 and behind the grain tank 7. As the other configurations are the same as those of the combine harvester in the first embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0063] 13, in the combine harvester of this embodiment, the exhaust gas purification device 74 is disposed near the front of the grain tank 7, the urea water supply device 175 is disposed to the side of the grain tank 7, and the urea water tank 174 is disposed behind the grain tank 7. In addition, the fuel tank 31 and the urea water tank 174 are disposed on the left and right sides behind the traveling body 2, thereby making it easy to distinguish the supply ports 32, 174a of the fuel and urea water, respectively.

[0064] As shown in Figures 13 to 15, the urea water tank 174 is fixed in a horizontal position to the bottom plate of the grain tank 7, with its rear end portion protruding rearward beyond the grain tank 7. In other words, the rear end portion of the urea water tank 7 is disposed near the connection portion between the vertical take-out conveyor 8a and the horizontal feed conveyor 87b. The rear end portion of the urea water tank 174 is connected to a urea water supply device 175 disposed on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 that are installed between the threshing device 5 and the grain tank 7.

[0065] As shown in Figures 14 and 15, a tank support 173 is provided on the outer surface of the outer bottom plate 7a of the grain tank 7, and a urea water tank 174 is supported on the outer surface of the outer bottom plate 7a of the grain tank 7 via the tank support 173. A bottom cover body 165 is detachably provided on the outer surface of the outer bottom plate 7a of the grain tank 7, and the urea water tank 174 is disposed on the inner side of the bottom cover body 165. A water supply port 174a is disposed on the right side of the urea water tank 174 facing to the right (outside the machine). In this case, an opening is provided in the rear cover 30, and the water supply port 174a of the urea water tank 174 protrudes toward the outside of the machine, so that water supply work can be easily performed from outside the machine.

[0066] 15, the rear end portion of the urea water tank 174, which is connected to the urea water supply pipe 179 and the urea water return pipe 180, is located near the rotation fulcrum of the grain tank 7. The rear end portion of the urea water tank 174 is connected to a urea water supply device 175 located on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 that are piped between the threshing device 5 and the grain tank 7. Therefore, when the grain tank 7 is open, the piping distance from the urea water tank 174 to the urea water supply device 175 is shorter than when the grain tank 7 is stored, and the difference in piping distance due to opening and closing the grain tank 7 can be reduced.

[0067] 16, the urea water supplying device 175 is disposed at a height position between the threshing device 5 and the grain tank 7, and lower than the exhaust gas purification device 74. The urea water supplying device 175 is disposed at a position higher than the urea water tank 174, offset in the front-rear direction (or left-right direction). In other words, the urea water supplying device 175 is fixed at a position higher than the urea water tank 174 and lower than the urea water injector 178.

[0068] By arranging the urea water injector 178 at a higher position than the urea water supply device 175, after the injection of the urea water is stopped, the remaining urea water can be returned to the urea water supply device 175 due to the height difference between the urea water supply device 175 and the urea water injector 178. Similarly, by arranging the urea water supply device 175 at a higher position than the urea water pump 174, after the injection of the urea water is stopped, the remaining urea water can be returned to the urea water tank 174 due to the height difference between the urea water tank 174 and the urea water supply device 175. Therefore, as shown in Fig. 16, by arranging the urea water supply device 175 at a height position between the exhaust gas purification device 74 and the urea water tank 174, the urea water can be returned to the urea water tank 174 without circulating it by the urea water supply device 175 after the engine is stopped, and the urea water return pipe 180 can be omitted.

[0069] <Third embodiment> Next, a third embodiment of the present invention will be described with reference to Figures 17 and 18. The combine harvester in this embodiment differs from the first and second embodiments in that a urea water tank 174 is disposed in the space below the threshing device 5. As the other configurations are similar to those of the combine harvesters in the first and second embodiments, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0070] 17 and 18, a urea water tank 174 is disposed under the machine frame 36 that constitutes the frame of the threshing device 5. The urea water tank 174 can be compactly installed by utilizing the space under the threshing machine frame 36, and the urea water tank 174 can be formed to have a large capacity, so that the urea water tank 174 can be replenished with urea water during maintenance work around the grain tank 7 or the engine 14, etc.

[0071] As shown in Figures 17 and 18, the urea water supply device 175 is disposed on the right side (grain tank 7 side) of the threshing device 5, and the piping path (urea water supply pipe 179 and urea water return pipe 180) connecting the urea water tank 174 and the urea water supply device 175 can be configured to be short. Therefore, the piping path from the exhaust gas purification device 74 to the urea water tank 174 can be shortened, and the pressure transfer of the urea water in each of the pipes 177, 179, 180 can be smoothed, and deterioration of the quality of the urea water due to recrystallization, freezing, etc. can be suppressed. Since the exhaust gas purification device 74 is disposed between the threshing device 5 and the grain tank 7, the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank 174 can be disposed compactly by utilizing the space around the threshing device 5, and the maintainability and assemblyability of the SCR system can be improved.

[0072] Furthermore, the urea water supply device 175 is fixed at a position higher than the urea water tank 174 and lower than the exhaust gas purification device 74. Therefore, after the injection of urea water is stopped, the remaining urea water can be returned to the urea water tank 174 due to the height difference between the urea water tank 174 and the urea water supply device 175. Therefore, after the engine is stopped, the urea water can be returned to the urea water tank 174 without being circulated by the urea water supply device 175, and the urea water return pipe 180 can be omitted.

[0073] 17 and 18, in this embodiment, the urea water tank 174 is disposed on the underside of the winnowing trough 37 in the lower part of the threshing machine frame 36. That is, by installing the urea water tank 174 at a position between the winnowing fan 58 and the first conveyor 61, the urea water tank 174 can be disposed below the urea water supply device 175 and offset in the left-right direction.

[0074] 17 and 18, the urea water supply pipe 179 and the urea water return pipe 180 connected to the urea water tank 174 can be arranged in a short length so as to run vertically along the right side of the threshing device 5 and horizontally along the lower side of the threshing machine frame 36. In addition, the urea water tank 174 can be disposed near the winnowing fan 56 that guides the exhaust heat from the engine 14, and by utilizing the exhaust heat from the engine 14, freezing and recrystallization of the urea water can be prevented.

[0075] Next, a modified example of the installation position of the urea water tank 174 disposed below the thresher frame 36 will be described with reference to Fig. 18. As shown by the imaginary line in Fig. 18, the urea water tank 174 may be installed on the underside of the first trough 38 or the second trough 39. That is, the urea water tank 174 may be installed in a position between the first conveyor 61 and the sorting fan 71, or the urea water tank 174 may be installed in a position behind the second conveyor 62. This allows the urea water tank 174 to be installed compactly by utilizing the space below the thresher frame 36.

[0076] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described with reference to Figures 19 to 21. The combine harvester in this embodiment differs from the combine harvester in the third embodiment in that a urea water tank 174 is disposed in the space to the side of the threshing device 5. As the other configurations are the same as those of the combine harvester in the third embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0077] 19 and 20, a urea water tank 174 for storing urea water is disposed inside the side cover 41 that covers the left side of the threshing device 5. The urea water tank 174 can be installed compactly by utilizing the space inside the side cover 51, and the piping path (urea water supply pipe 179 and urea water return pipe 180) connecting the urea water tank 174 to the urea water supply device 175 disposed on the right side of the threshing device 5 (grain tank 7 side) can be configured to be short.

[0078] 19 and 20, the urea water tank 174 is disposed on the inside of the side cover 41, to the left of the fuel tank 31. The urea water tank 174 is configured in an L-shape that covers the lower to rear side of the left side of the fuel tank 31. The urea water tank 174 is configured to surround the lower and rear sides of the fuel filler port 32 that protrudes from the upper left side of the fuel tank 31 toward the outside of the aircraft (left side).

[0079] The urea water tank 174 is provided in the front-rear direction on the left side of the fuel tank 31, and has a shape in which its rear portion protrudes upward. The urea water tank 174 has a water supply port 174a protruding toward the outside of the aircraft (left side) from the upward protruding portion at the rear. By configuring the urea water tank 174 in this manner, the installation space of the fuel tank 31 can be utilized to install the urea water tank 174 compactly, and the fuel supply port (fuel supply unit) 32 and the water supply port (urea water supply unit) 174a can be arranged close to each other, improving the ease of replenishment.

[0080] In this embodiment, the urea water tank 174 may be integral with the side cover, as in a modified example shown in Fig. 21. In the modified example shown in Fig. 21, the urea water tank 174 has a tank portion 174c for storing urea water on the back side (fuel tank 31 side) of a side cover portion 174b that covers the entire left side surface of the fuel tank 31, and a water supply port 174a that communicates with the tank portion 174c on the front side of the side cover portion 174b. An opening 174d is provided in an area of ​​the side cover portion 174b where the tank portion 174c is not installed, and the fuel supply port 32 of the fuel tank 31 is inserted into the opening 174d.

[0081] At this time, by configuring the connection parts between the tank portion 174c and the urea water supply pipe 179 and the urea water return pipe 180 to be detachable using a quick coupler or the like, the side cover integrated urea water tank 174 can be removed. This makes it easier to perform maintenance, cleaning, and other tasks around the fuel tank 31 by removing the urea water tank 174, and by removing and storing the urea water tank 174, the urea water can be managed in an optimal temperature environment.

[0082] <Fifth embodiment> Next, a fifth embodiment of the present invention will be described with reference to Figures 22 to 29. The combine harvester in this embodiment differs from the third embodiment in that the urea water tank 174 is disposed behind the grain tank 7 and overlaps the fuel tank 31. As the other configurations are similar to those of the combine harvester in the third embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0083] 22 and 23, the urea water tank 174 is placed under the threshing device 5, overlapping with the fuel tank 31, and the water supply port 174a of the urea water tank 174 and the fuel supply port 32 of the fuel tank 31 are protruded toward the outside of the threshing device 5. This allows the supply ports (fuel supply port 32 and water supply port 174a) of the fuel tank 31 and the urea water tank 174 to be located close to each other, reducing the burden of fuel and water supply operations.

[0084] As shown in Figures 22 and 23, a urea water tank 174 for storing urea water is arranged behind the threshing device 5, at the rear lower part of the machine frame 36 (second trough 39) and the oscillating sorting plate 57 constituting the frame body of the threshing device 5, overlapping with the fuel tank 31. In addition, the urea water tank 174 and the fuel tank 31 are arranged vertically overlapping inside the side cover 41 covering the left side of the threshing device 5, and the fuel supply port 32 and the water supply port 174a protrude outward from the opening of the side cover 41. This allows the urea water tank 174 to be installed compactly by utilizing the space behind the threshing device 5, and allows the piping path (urea water supply pipe 179 and urea water return pipe 180) connecting the urea water tank 174 to the urea water supply device 175 arranged on the right side (grain tank 7 side) of the threshing device 5 to be configured to be short.

[0085] 22 and 23, the upper part of the fuel tank 31 is tapered (a shape in which the front-to-rear width narrows toward the top), and the urea water tank 174 is configured in a generally inverted U-shape. By shaping the urea water tank 174 to match the upper surface of the fuel tank 31, the urea water tank 174 is installed on the fuel tank 31 such that the upper surface of the fuel tank 31 is covered by the lower surface of the urea water tank 174. The urea water tank 174 is mounted on the fuel tank 31 so as to sandwich the fuel tank 31 from the front and rear, and the urea water tank 174 is fixed onto the fuel tank 31.

[0086] The urea water tank 174 is configured to be detachable from the fuel tank 31. At this time, the urea water tank 174 may be configured to be detachable by sliding it in the left-right direction relative to the fuel tank 31, or the urea water tank 174 may be fitted and detached in the up-down direction relative to the fuel tank 31. At this time, the connection parts between the urea water tank 174 and the urea water supply pipe 179 and the urea water return pipe 180 are configured to be detachable by a quick coupler or the like. By configuring the urea water tank 174 to be detachable from the fuel tank 31 in this way, not only can water be easily supplied by replacing the urea water tank 174, but the urea water tank 174 can also be removed and stored after work is completed, preventing deterioration of the quality of the urea water.

[0087] Next, a first modified example of this embodiment will be described below with reference to Figures 24 to 26. In this modified example, as shown in Figures 24 to 26, the urea water tank 174 is disposed below the fuel tank 31 so as to be surrounded by the fuel tank. By having the fuel tank 31 surround the urea water tank 174, the fuel tank 31 functions as a heat insulating layer, improving the heat retention effect within the urea water tank 174 and suppressing deterioration of the urea water stored in the urea water tank 174.

[0088] 25 and 26, in the first modified example, a cutout 31a is provided on the lower left side surface (the side surface on which the fuel filler port 32 is provided) of the fuel tank 31, and a urea water tank 174 is fitted into the cutout 31a. The urea water tank 174 has a shape that matches the cutout 31a of the fuel tank 31, and is therefore disposed on the lower left side of the fuel tank 31, and the top surface and right side surface of the urea water tank 174 are covered by the cutout 31a of the fuel tank 31.

[0089] 25, the fuel tank 31 is fixed to the traveling body 1 by a tank support (support belt) 33. At this time, the fuel tank 31 is fixed by the tank support 33 at a position overlapping with the storage position of the urea water tank 174 (position where the notch 31a is formed), so that the urea water tank 174 can also be supported and fixed to the traveling body 1 by the tank support 33. Also, since the tank support 33 is installed so that it is hung on the left end of the urea water tank 174, the urea water tank 174 can be separated from the fuel tank 31 without removing the tank support 33.

[0090] Next, a second modified example of this embodiment will be described below with reference to Figs. 27 to 29. In this modified example, as shown in Figs. 27 to 29, the urea water tank 174 is disposed below the fuel tank 31, and the urea water tank 174 is disposed so as to be surrounded by the fuel tank, and the urea water tank 174 has a convex portion 174x that protrudes upward from the water supply port 174a. By providing the convex portion 174x that extends upward from the water supply port 174, a space that is not filled with urea water can be secured in a part of the convex portion 174x. Therefore, even if the urea water in the urea water tank 174 freezes, the volume of the urea water in the urea water tank 174 is prevented from exceeding the volume of the urea water tank 174, and damage to the urea water tank 174 can be prevented.

[0091] 27 to 29, in the second modified example, the left end of the urea water tank 174 is shaped to protrude further outboard (left side) than the left end of the fuel tank 31. That is, when the urea water tank 174 is fitted into the cutout 31a of the fuel tank 31, the left side surface of the urea water tank 174 is located to the left of the left side surface of the fuel tank 31. A protrusion 174x is provided at the left end of the urea water tank 174, protruding upward beyond the water supply port 174a, at a position offset from the fuel supply port 32 of the fuel tank 31, and a breather 174y is provided on the upper surface of the protrusion 174x to allow outside air to be taken in.

[0092] 28 and 29, by providing the breather 174y at a position higher than the water supply port 174a, even when urea water is supplied to the urea water tank 174, the convex portion 174x does not become full, and the upper portion of the convex portion 174x is always filled with air through the breather 174y. Therefore, even if the urea water in the urea water tank 174 freezes, the increase in the volume of the frozen urea water can be accommodated in the space above the convex portion 174x and does not exceed the volume of the urea water tank 174, thereby preventing damage to the urea water tank 174. [Explanation of symbols]

[0093] 5. Threshing Equipment 7 Grain Tank 10 Driver's Cabin 31 Fuel Tank 14. Diesel engine 74 Exhaust gas purification device 75 Case 1 81 Purification inlet pipe (exhaust gas intake) 82 Purification outlet pipe (exhaust gas outlet) 83 Tailpipe 97 Engine Room 91 Engine room frame 92 Left support body (rear frame) 94 Horizontal frame (rear frame) 97 Engine Room 174 Urea tank 175 Urea water supply equipment 229 Case No. 2 236 SCR inlet pipe (exhaust gas intake) 237 SCR outlet pipe (exhaust gas outlet) 239 Urea mixing tube

Claims

1. An engine that is a power source mounted on the traveling body, an exhaust gas purification device including a first case for removing particulate matter in exhaust gas from the engine and a second case for removing nitrogen oxides in exhaust gas from the engine; an engine room in which the engine is installed; A threshing device for threshing grains; A grain tank is provided behind the engine room and receives grain threshed by the threshing device. The first case and the second case are arranged in a recess of the grain tank facing the engine room so as to overlap with the grain tank in a plan view and a front view, and an exhaust connecting pipe connecting the engine and the exhaust gas purification device is arranged below a horizontal frame having a length in the left-right direction of the engine frame that forms the engine room, and an inlet pipe provided in the exhaust gas purification device is connected to the exhaust connecting pipe. combine.

2. The first case and the second case are arranged so that their respective longitudinal directions are along the front and rear of the traveling direction of the traveling body, and the inlet pipe is provided at a location of the first case facing the engine, A combine harvester as claimed in claim 1.

3. The inlet pipe is disposed on the lower surface side of the first case. A combine harvester as claimed in claim 2.

Images