combine

Abstract

To provide a combine harvester enabling compactly installing an exhaust gas purification device.SOLUTION: A combine harvester includes: a prime mover part including an engine 14; a thresher 5 performing threshing treatment; a grain tank 7 positioned at a lateral side of the thresher 5 and a rear side of the prime mover part, and accumulating grains after being threshed; and an exhaust gas purification device 74 for treating exhaust gas of the engine 14. The exhaust gas purification device 74 includes: a first case 75 for removing particulate substances contained in exhaust gas of the engine 14; and a second case 229 for removing nitrogen oxide substances contained in exhaust gas after being treated by the first case 75. The second case 229 is arranged in a state of being overlapped on the grain tank 7 in plane view and front view. A recess 7a is formed on a surface facing the grain tank 7 and an engine room 97 at the front left side of the grain tank 7, and the second case 229 is arranged in a state of entering into the recess 7a.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to combine harvesters, such as combine harvesters that harvest stalks planted in fields and collect grain, or feed combine harvesters that harvest stalks for feed and collect them as feed. More specifically, the present invention relates to combine harvesters equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) contained in the exhaust gas of diesel engines, etc., or nitrogen oxides (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 in the exhaust path of a diesel engine as exhaust gas purification devices (exhaust gas aftertreatment devices), and exhaust gas is introduced into the DPF case and the SCR case to purify the exhaust gas emitted from the diesel engine (see, for example, Patent Documents 1 to 3). Conventionally, combine harvesters are configured to cut unharvested stalks in a field with a cutting blade device, transport the harvested stalks to a threshing device with a stalk transporting device for threshing, and collect the grain in a grain tank. The engine is mounted on a traveling body, and a DPF case is positioned horizontally above the engine, with exhaust gas being discharged from the engine toward the DPF case (see, for example, Patent Document 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-74420 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-21505 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-177233 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-209813 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, when the engine and exhaust gas purification device (DPF case) are installed close to each other in the engine compartment, installation space for the exhaust gas purification device (SCR case) must be secured around the engine mounting area, which limits the volume of the engine compartment or the volume of the exhaust gas purification device (DPF case or SCR case). Furthermore, when the exhaust gas purification device (DPF case or SCR case) is supported outside the engine compartment, the installation location for the urea mixing pipe connecting the SCR case to the DPF case or the exhaust gas purification device is limited, which makes it difficult to simplify the installation structure for the exhaust gas purification device. In addition, when the exhaust gas purification device (DPF case or SCR case) is installed on the vehicle body away from the engine, such as in a truck, installation space for the exhaust gas purification device can be easily secured, but there is a problem in that the exhaust gas temperature inside the exhaust gas purification device easily drops below a predetermined temperature.

[0005] Therefore, the present invention aims to provide a combine harvester that has been improved by considering these current situations. [Means for solving the problem]

[0006] To achieve the above object, one embodiment of a combine harvester comprises a power unit equipped with an engine, a threshing device that performs threshing processing, a grain tank located to the side of the threshing device and rearward of the power unit and storing threshed grain, and an exhaust gas purification device that treats the engine's exhaust gas.The exhaust gas purification device is equipped with a first case that removes particulate matter contained in the engine's exhaust gas and a second case that removes nitrogen oxides contained in the exhaust gas after treatment in the first case.Exhaust gas is introduced from the first case into the second case via a urea mixing pipe.The second case is arranged so as to overlap with the grain tank in plan and front views.A recess is formed on the front left side of the grain tank, on the surface facing the grain tank and the engine compartment, and the second case is arranged so as to fit into the recess. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a left side view of a six-row combine harvester showing an embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a front perspective view showing the configuration inside the engine compartment. [Figure 5] FIG. 2 is a perspective view showing the positional relationship between the engine peripheral parts, the grain tank, and the thresher. [Figure 6] FIG. 2 is an external perspective view showing the engine and the 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 part of the threshing device. [Figure 9] FIG. 2 is an explanatory diagram of urea water supply. [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. 10 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. 10 is a perspective view showing the arrangement of parts on the traveling body of a combine harvester according to a fourth embodiment. [Figure 20] FIG. [Figure 21] FIG. 10 is a diagram showing a modified example of the urea water tank in the combine harvester. [Figure 22] FIG. 10 is a perspective view showing the arrangement of parts on the traveling body of 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. 10 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. [Figure 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 the configuration when the fuel tank and the urea water tank shown in FIG. 24 are separated. [Figure 27] FIG. 10 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] FIG. 28 is a front view showing a state in which the urea water tank shown in FIG. 27 is filled with urea water. DETAILED DESCRIPTION OF THE INVENTION

[0008] 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 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 as viewed in the forward direction will be referred to simply as the left side, and the right side as viewed in the forward direction will be referred to simply 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 serving as a traveling section. A six-row harvesting device 3 that harvests and collects stalks is mounted on the front of the traveling body 1 so that it can be raised and lowered around a harvesting pivot 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 grain removed from the threshing device 5 are mounted side by side on the traveling body 1. The threshing device 5 is located on the left side of the traveling body 1, and the grain tank 7 is located on the right side of the traveling body 1.

[0009] 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 grain inside the grain tank 7 is discharged from a rice dumping port 9 of the grain discharge conveyor 8 into the bed of a truck, a container, or the like. A driver's cabin 10 is provided on the right side of the reaping device 3, in front of the grain tank 7. A cabin rotation fulcrum shaft 10a is provided at the lower front of the driver's cabin 10, and the lower front of the driver's cabin 10 is rotatably supported on the traveling machine body 1 via the cabin rotation fulcrum shaft 10a, so that the driver's cabin 10 is installed movably toward the front side outside the machine, and is configured to rotate forward around the cabin rotation fulcrum shaft 10a.

[0010] Arranged within the driver's cabin 10 are a control handle 11, a driver's seat 12, a main speed change lever 15, an auxiliary speed change lever 16, a threshing clutch lever 17 for operating the threshing clutch on and off, and a reaping clutch lever 18 for operating 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 handle column with the control handle 11, and a lever column with the levers 15, 16, 17, and 18 mounted thereon.

[0011] As shown in Figure 1, left and right track frames 21 are arranged on the underside of the traveling body 1. The track frames 21 are 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 plurality of track rollers 24 that keep the grounded side of the traveling crawler 2 in a grounded state, and intermediate rollers 25 that hold the non-grounded side of the traveling crawler 2. The drive sprocket 22 supports the front side of the traveling crawler 2, the tension roller 23 supports the rear side of the traveling crawler 2, the track rollers 24 support the grounded side of the traveling crawler 2, and the intermediate rollers 25 support the non-grounded side of the traveling crawler 2.

[0012] 1 and 2, a fuel tank 31 that stores fuel to be supplied to the engine 14 is located 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 in a position below the straw discharge cutter 65 at the rear of the threshing device 5, and a fuel filler 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.

[0013] As shown in Figures 1 and 2, a reaping frame 51 connected to the reaping pivot shaft 4a of the reaping device 3 is provided with a clipper-type cutting blade device 52 that cuts the base of uncut culms planted in the field. A six-row culm pulling device 53 that pulls up the uncut culms planted in the field is located in front of the reaping frame 51. A culm transport device 54 that transports the reaped culms cut by the cutting blade device 52 is located between the culm pulling device 53 and the front end (feed start end) of the feed chain 6. Six rows of dividing bodies 55 that divide the uncut culms are protruded from the lower front of the culm pulling device 53. The reaping device 3 is configured to continuously cut the uncut culms planted in the field while moving within the field.

[0014] 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 stalks, 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 threshed grains removed 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 stalks transported from the reaping device 3 by the stalk transport device 54 are passed on to the feed chain 6 and carried into the threshing device 5 where they are threshed by the threshing drum 56.

[0015] As shown in Figure 1, below the oscillating sorting board 57, there are provided a first conveyor 61 that removes the grains (first grade) sorted by the oscillating sorting board 57, and a second conveyor 62 that removes second grade grains such as grains with stalks. The oscillating sorting board 57 is configured so that thawed grains that have leaked through a receiving net 67 stretched below the handling drum 56 are subjected to oscillating sorting (gravity sorting) by a feed pan 68 and a chaff sieve 69. The grains that have fallen from the oscillating sorting board 57 have dust particles removed from them by sorting air from the 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 grain lifting conveyor 63 and collected in the grain tank 7.

[0016] As shown in Figure 1, the oscillating sorting board 57 is configured to drop second-grade grains, such as grains with stalks, from the chaff sieve 69 onto the second conveyor 62 by oscillating sorting. It is equipped with a sorting fan 71 that winds the second-grade grains that fall below the chaff sieve 69. The second-grade grains that fall from the chaff sieve 69 have dust and straw particles removed by the sorting air 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 surface of the feed pan 68 via the return conveyor 66, and is configured to return the second-grade grains to the upper surface of the oscillating sorting board 67 for re-sorting.

[0017] 1 and 2, a straw discharge chain 64 and a straw discharge cutter 65 are arranged at the rear end (feed end) of the feed chain 6. The discharged straw (culms from which the grains have been threshed) passed from the rear end of the feed chain 6 to the straw discharge chain 64 is either discharged in a long state behind the traveling machine body 1, or 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 machine body 1.

[0018] As shown in Figures 4 and 5, the grain tank 7 has a purification device installation recess 7a formed by a cutout on the left side of the front, a grain discharge conveyor installation recess 7b formed by a groove in the front-to-rear direction on the left side of the top surface, and a grain lifting conveyor installation recess 7c formed by a vertically stepped shape in the center of the left side. A space is provided behind the engine compartment 97 in the purification device installation recess 7a on the front 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 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 socket provided at the top of the grain conveyor installation recess 7c.

[0019] As shown in Figures 3, 10, and 11, the grain discharge conveyor 8 is rotatably supported at the upper end of the vertical take-out conveyor (vertical feed conveyor) 8a, and a rice dumping port 9 is provided at the feed end of the grain discharge conveyor 8. A cross-feed conveyor 8b is arranged in the front-to-rear direction at the bottom of the grain tank 7, and the lower end (base end) of the vertical take-out conveyor 8a is connected to the rear end of the cross-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 cross-feed conveyor 8b, causing the grain inside the grain tank 7 to flow downward toward the cross-feed conveyor 8b. The cross-feed conveyor 8b extends along the front and rear of the bottom of the grain tank 7 and transports the grain flowing down along the bottom plate of the grain tank 7 to the vertical take-out conveyor 8a at the rear.

[0020] The vertical take-out conveyor 8a is connected to the rear end of the horizontal feed conveyor 8b, which protrudes from the rear end face of the grain tank 7, and extends upward along the rear end face of the grain tank 7. The vertical take-out conveyor 8a is installed upright behind the grain tank 7, with its lower end (base end) connected to the horizontal feed conveyor 8b and its upper portion 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 body 1, allowing the grain tank 7 to move 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 are openable. Furthermore, a rear cover 30 that covers the periphery of the vertical take-out conveyor 8a is removably provided at the rear of the grain tank 7, and a bottom cover body 165 is removably provided on the outer surface of the outside bottom plate 7a of the grain tank 7.

[0021] 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 serves as a diesel particulate filter (DPF) that removes particulate matter in the exhaust gas of the diesel engine 14, and the second case 229 serves as a urea selective catalytic reduction (SCR) system that removes nitrogen oxides in the exhaust gas of the diesel engine 14. 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.

[0022] The first case 75 also has an inlet case 76 and an outlet case 77. A platinum-based diesel oxidation catalyst 79, which generates nitrogen dioxide (NO), is disposed inside the inlet case 76. A honeycomb-structured soot filter 80, which continuously oxidizes and removes trapped particulate matter (PM) at relatively low temperatures, is disposed inside the inlet case 76 and the outlet case 77. The diesel oxidation catalyst 79 and the soot filter 80, which are disposed in series in the direction of exhaust gas flow within the inlet case 76 and the outlet case 77, not only remove particulate matter (PM) from 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 disposed in series in the direction of exhaust gas flow within the second case 229. The SCR catalyst 232 and the oxidation catalyst 233 within the second case 229 are configured to reduce nitrogen oxides (NOx).

[0023] 4 to 7, the first case 75 and the second case 229 are configured in a long cylindrical shape that extends long in the fore-and-aft direction of the aircraft. 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).

[0024] 4 to 7, a turbocharger 118 that forcibly sends air to 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 exhaust gas from the diesel engine 14 is introduced into the first case 75. A urea mixing pipe 239 that connects an 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 bendable and expandable bellows-shaped connecting pipe 98, so that vibrations of the engine 14 on the turbocharger 118 side are not transmitted to the exhaust connecting pipe 119 side.

[0025] On the other hand, the purification outlet pipe 82 and the urea water injection portion 240 of the urea mixing pipe 239 are detachably fastened with bolts using pipe flanges. The inlet side case 76 and the outlet side case 77 are detachably connected by bolting together multiple 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. In addition, a 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. Exhaust gas from 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 urea water in a urea water tank 174 (described later) is mixed with the exhaust gas. The exhaust gas is then introduced into the second case 229 and released outside the aircraft from the tail pipe 83.

[0026] With the above-described configuration, particulate matter (PM) contained in the exhaust gas of the diesel engine 14 is trapped by the soot filter 80 in the first case 75 and 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 carbon monoxide (CO) and hydrocarbon (HC) contents in the exhaust gas of the diesel engine 14 are reduced. Next, inside the urea mixing tube 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, which has been mixed with ammonia produced by hydrolysis, has the nitrogen oxide (NOx) content reduced by the SCR catalyst 232 and oxidation catalyst 233 for urea selective catalytic reduction. The exhaust gas of the diesel engine 14 is purified in the first case 75 and the second case 229 and is then emitted outside the aircraft through the tailpipe 83.

[0027] Next, as shown in Figures 4 and 6, an engine room frame 91 serving as a machine frame is erected on the traveling machine body 1 in front of the grain tank 7, and the engine room frame 91 forms an engine room 97. The diesel engine 14 is mounted on the top side of the traveling machine body 1 and installed inside the engine room 97. In addition, cooling components such as a water-cooled radiator (not shown) and a cooling fan 115 are installed inside the engine room 97 to the side of the diesel engine 14. The cooling fan 115 is configured to draw in outside air from the outside right side of the combine machine body toward cooling components such as the radiator (not shown), while exhausting warm air from the diesel engine 14 toward the threshing device 5.

[0028] 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 cooling outside air 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 a working part adjacent to the engine room frame 91 (engine room 97).

[0029] The engine room frame 91 has a left square pipe-shaped support column 92, a right inverted U-shaped support column 93, and a square pipe-shaped horizontal frame 94 whose both ends are integrally fixed to the left and right support columns 92, 93. One end of the square pipe-shaped horizontal frame 94 is connected to the upper end of the square pipe-shaped support column 92, and the other end is connected to and fixed to a square pipe-shaped frame 93a fixed above the inverted U-shaped support column 93.

[0030] Additionally, rubber pressure-contact 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 cradles 96 of the horizontal frame 94, so that the rear of the driver's cabin 10 can be moved toward and away from the cradles 96 of the horizontal frame 94 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 at the upper end of the left support column 92, and the grain discharge conveyor 8 is supported in its stored position via the conveyor support 90.

[0031] Furthermore, there is provided an air cleaner 123 that supplies outside air to the diesel engine 14, and a pre-cleaner 124 that takes in outside air into the air cleaner 123. The air cleaner 123 is disposed on the top surface of the engine compartment 97 to the right of the exhaust gas purification device 74, and the pre-cleaner 124 is disposed above the engine compartment 94 and to the front right of the grain tank 7, 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 rear surface of the horizontal frame 94 of the engine compartment frame 91, and is therefore located on the front right side of the exhaust gas purification device 74.

[0032] 4 to 6, etc., the turbocharger 118 is installed above the front side of the diesel engine 14, and has a compressor case 118a with a built-in blower wheel on its right side, and a turbine case 118b with a built-in turbine wheel on its left side. The intake side provided at the right end of the compressor 118a communicates with the intake and discharge side of the air cleaner 123 via an air intake pipe 120. On the other hand, an exhaust outlet pipe 99 installed 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 that is connected to the exhaust gas inlet (purification inlet pipe 81) of the exhaust gas purification device 74, which is an aftertreatment device.

[0033] 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 pre-cleaner 124 are arranged on the left and right sides of the engine 14 behind the engine room frame 91. That is, with respect to the turbocharger 118 in front of the engine 14, the air cleaner 123 and the pre-cleaner 124, which form the intake system, are arranged on the right compressor case 118a side, 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.

[0034] Next, the mounting structure and support structure of the exhaust gas purification device 74 will be described with reference to Figures 4 to 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.

[0035] The exhaust gas purification device 74 is supported on the traveling machine body 1 by fixing a case fixing body 231, on which the first case 75 and the second case 229 are mounted on the upper surface, to a 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 housing 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 machine body 1, so that the support base 250 is supported at an upper position in the recess 7a of the grain tank 7.

[0036] 4 and 6, the front side of the support base 250 is supported by the engine room frame 91 by connecting one end of a bridge frame 252, which is fixed to the back surface of the support base 250, to a horizontal frame 94 of the engine room frame 91. Also, as shown in FIG. 5, the left edge of the support base 250 is supported by the right side of the top of the threshing device 5 (the threshing upper surface frame at the upper right of the threshing machine housing) by connecting it via an assembly adjustment frame 253. Furthermore, as shown in FIG. 7, the right edge of the support base 250 is supported on the support frame 251 by connecting it to the upper end of the support frame 251 via a horizontal cross frame 254.

[0037] 4 and 5, the bridging frame 252 extends 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.

[0038] As shown in Figures 4 to 7, the grain tank 7 has a purifier installation recess 7a on the surface facing the engine compartment 97, and the exhaust gas purifier 74 made up of the first case 75 and the 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 compartment 97, while preventing workers from coming into contact with the exhaust gas purifier 74, which becomes very hot. In addition, because the exhaust heat from the engine compartment 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 the exhaust gas purifier 74 can maintain a high purification effect.

[0039] 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. Furthermore, by arranging the exhaust gas purification device 74 at a high position, it is possible to prevent water that forms as condensation due to a drop in temperature when the engine 14 is stopped from accumulating inside the exhaust gas purification device 74.

[0040] 4 to 7, the first case 75 and the second case 229 of the exhaust gas purification device 74 are connected in parallel by a 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 a urea mixing pipe 239. The urea mixing pipe 239 is disposed between the first and second cases 75, 229 in parallel with each of the first and second cases 75, 229. This allows the first and second cases and the urea mixing pipe to be configured as an integrated unit, 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, ensuring the grain storage capacity of the grain tank 7.

[0041] 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 aligned in the front-to-rear direction, and the first case 75 is positioned on the threshing device 5 side. By positioning the first case 75 on the threshing device 5 side and the second case 229 at the rear of the recess 7a of the grain tank 7, the second case 229 and the urea mixing pipe 239 can be arranged so that they are covered by the grain tank 7, and the first case 75 can be positioned near the exhaust port of the engine 14. This allows the exhaust path from the engine 14 to the first case 75 to be short, maintaining high performance in the regeneration process in the first case 75. Furthermore, the second case 229 and the urea mixing pipe 239 can be positioned in a high-temperature environment surrounded by the grain tank 7 behind the engine compartment 97, preventing freezing of the urea solution and maintaining high purification performance in the second case 229.

[0042] 7 to 12, the system includes a urea water tank 174 that stores urea water (urea water solution for selective catalytic reduction), and a urea water supply device 175 that supplies urea water to a urea water injection section 240 of the urea mixing pipe 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 pipe 239, causing the urea water to be sprayed into the urea mixing pipe 239 from a urea water injection valve 178 of the urea water injection section 240.

[0043] 9, the urea water supply device 175 includes a urea water pump 171 that pumps and feeds the urea water solution in the 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 controls fuel injection 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.

[0044] A urea water injection valve 178 is attached to a 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 water temperature sensor 183 of the urea water tank 174 and a urea water amount sensor 184 of the urea water tank 174 are connected to a urea injection controller 182, and the engine controller 181 and the urea injection controller 182 are also connected to each other, 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.

[0045] First, the mounting structure of the urea water supply device 175 will be described. As shown in Figures 7 and 8, the urea water supply device 175 is disposed between the threshing device 5 and the grain tank 7, at a height position lower than the exhaust gas purification device 74. In other words, the urea water supply device 175 is fixed at a position lower than the urea water injector 178. Therefore, after the injection of urea water stops, the height difference between the urea water supply device 175 and the urea water injector 178 allows the urea water remaining in the urea water injection pipe 177 and the like to be returned to the urea water supply device 175.

[0046] 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 arranged 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.

[0047] 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. Furthermore, 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.

[0048] 7 and 8, the urea water supply device 175 is fixed to the right side of the threshing device 5 (the grain tank 7 side) in an area sandwiched between the grain lifting conveyor 63 and the return conveyor 66. This allows the urea water supply device 175 to be located near the exhaust gas purification device 74 located in front of the grain tank 7 adjacent to the threshing device 5, thereby enabling the urea water piping (urea water injection pipe 177) connecting the urea water tank 174 to the urea water injection unit 240 to be configured to be short. Furthermore, the exhaust gas purification device 74 and the urea water supply device 175 can be located in the flow path of exhaust air formed between the threshing device 5 and the grain tank 7 behind the engine compartment 97. This allows the SCR system to operate in an optimal temperature environment, for example by preventing the urea water from freezing.

[0049] 7 and 8, in this embodiment, the urea water supply device 175 is fixed to a position forward of the grain lifting conveyor 63 and below the return conveyor 66. That is, the urea water supply device 175 is fixed to the right side surface of the threshing device 5, and is disposed below the return conveyor 66 and between the winnowing fan 58 and the first conveyor 61. That is, the urea water supply device 175 is disposed at a position surrounded by the grain 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.

[0050] 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 supply device 175 in the area surrounded by the grain lifting conveyor 63 and the return conveyor 66, the urea water supply 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.

[0051] Next, referring to Figure 8, we will explain a modified example of the installation position of the urea water supply device 175 placed in the area sandwiched between the grain lifting conveyor 63 and the return conveyor 66. As shown in Figure 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 will be placed at a height below the exhaust gas purification device 74.

[0052] 8, the urea water supply device 175 may be installed behind the grain lifting conveyor 63, either above or below the return conveyor 66. Furthermore, when the grain 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 supply device 175 may be installed between the grain lifting conveyor 63 and the return conveyor 66.

[0053] Next, the mounting structure of the urea water tank 174 will be described with reference to Figures 10 to 12. As shown in Figures 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 tank 31 has a fuel inlet 32 ​​that protrudes toward the left side, while the urea water tank 174 has a water inlet 174a that protrudes toward the right side. Specifically, the urea water tank 174 has a water inlet 174a that is provided facing rearward (diagonally rearward right) from the outside of the machine, and is disposed vertically between the vertical take-out conveyor 8a and the rear cover 30. The water inlet 174a protrudes from an opening (not shown) in the rear cover 30, making the water inlet 174a accessible from outside the machine.

[0054] As shown in Figures 10 to 12, the urea water tank 174 is disposed upright with its longitudinal direction in the up-down direction, and is fixed to the underside of the right edge (outside edge) of the rear end face of the grain tank 7. The water supply port 174a protrudes to the right side, opposite the fuel supply port 32 which faces to the left side of the traveling body 1, thereby preventing misidentification of the fuel supply port 32 and the water supply port 174a when filling the fuel tank 31 with fuel or filling the urea water tank 174 with water. Furthermore, because the water supply port 174a protrudes diagonally rearward, the amount of wrapping of the water supply hose from the fuel supply port 32 to the water supply port 174a can be reduced, allowing the fuel supply and water supply operations to be performed simultaneously.

[0055] As shown in Figures 10 and 11, the 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 alongside 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 piped between the threshing device 5 and the grain tank 7. In other words, the space around the grain tank 7 can be utilized to dispose the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank, thereby ensuring the capacity of the grain tank 7.

[0056] 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, because 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.

[0057] 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. By rotating the grain tank 7 toward the outside of the machine vertically around the vertical rotation axis of the vertical take-out conveyor 8a, the right side of the threshing device 5 and the rear of the engine compartment 97 can be opened. Because the urea-water tank 174 is installed near the vertical take-out conveyor 8a, the connection portions with the urea-water supply pipe 179 and the urea-water return pipe 180 can be positioned near the rotation fulcrum of the grain tank 7. The urea-water supply pipe 179 and the urea-water return pipe 180 are routed from the left side of the grain tank 7, bypassing the rear. 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 when the grain tank 7 is opened or closed can be reduced.

[0058] 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 and the like, which become hot during operation, ensuring the safety of workers and enabling easy access to the exhaust gas purification device 74 and the urea water supply device 175 by opening the grain tank 7 for various work such as maintenance.

[0059] <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 of 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 of the first embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0060] 13, the combine harvester of this embodiment has the exhaust gas purification device 74 disposed near the front of the grain tank 7, the urea water supply device 175 disposed to the side of the grain tank 7, and the urea water tank 174 disposed behind the grain tank 7. In addition, by distributing the fuel tank 31 and the urea water tank 174 to the left and right behind the traveling body 2, the structure makes it easy to identify the supply ports 32, 174a for the fuel and the urea water, respectively.

[0061] 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 protruding further rearward than the grain tank 7. In other words, the rear end of the urea water tank 174 is located near the connection between the vertical take-out conveyor 8a and the horizontal feed conveyor 87b. The rear end 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 installed between the threshing device 5 and the grain tank 7.

[0062] 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 inboard 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 rightward (outboard side). 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 outboard, making it possible to easily supply water from outside the machine.

[0063] 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 pivot point 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 the urea water supply pipe 179 and the urea water return pipe 180, which 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 when the grain tank 7 is opened or closed can be reduced.

[0064] 16, the urea water supply device 175 is disposed between the threshing device 5 and the grain tank 7, at a height position lower than the exhaust gas purification device 74. The urea water supply device 175 is disposed at a position higher than the urea water tank 174 and offset in the front-to-rear direction (or left-to-right direction). In other words, the urea water supply device 175 is fixed at a position higher than the urea water tank 174 and lower than the urea water injector 178.

[0065] By arranging the urea water injector 178 at a higher position than the urea water supply device 175, after the injection of urea water is stopped, the remaining urea water can be returned to the urea water supply device 175 due to the difference in height 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 urea water is stopped, the remaining urea water can be returned to the urea water tank 174 due to the difference in height 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, after the engine is stopped, the urea water can be returned to the urea water tank 174 without circulating it by the urea water supply device 175, and the urea water return pipe 180 can be omitted.

[0066] <Third embodiment> Next, a third embodiment of the present invention will be described with reference to Figures 17 and 18. The combine harvester of 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 the same as those of the combine harvesters of 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.

[0067] 17 and 18, the urea water tank 174 is disposed below the machine frame 36 that constitutes the frame of the threshing device 5. The urea water tank 174 can be installed compactly by utilizing the space below 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 when maintenance work is performed around the grain tank 7 or the engine 14, etc.

[0068] 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 connecting the urea water tank 174 and the urea water supply device 175 (the urea water supply pipe 179 and the urea water return pipe 180) can be configured to be short. This shortens the piping from the exhaust gas purification device 74 to the urea water tank 174, facilitating the pressure transfer of the urea water through the respective pipes 177, 179, 180 and suppressing deterioration in the quality of the urea water due to recrystallization, freezing, etc. Because the exhaust gas purification device 74 is disposed between the threshing device 5 and the grain tank 7, the space around the threshing device 5 can be utilized to compactly dispose the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank 174, improving the maintainability and assembly of the SCR system.

[0069] 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 difference in height between the urea water tank 174 and the urea water supply device 175 allows the remaining urea water to be returned to the urea water tank 174. 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.

[0070] 17 and 18, in this embodiment, the urea water tank 174 is disposed below the winnowing trough 37 in the lower part of the thresher 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.

[0071] 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 short lengths so as to run vertically along the right side of the threshing device 5 and horizontally along the underside of the thresher 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.

[0072] Next, a modified example of the installation position of the urea water tank 174 arranged below the thresher frame 36 will be described with reference to Fig. 18. As shown by the phantom 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.

[0073] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described with reference to Figures 19 to 21. The combine harvester of this embodiment differs from 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 of the third embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0074] 19 and 20, a urea water tank 174 for storing urea water is arranged 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 (the urea water supply pipe 179 and the urea water return pipe 180) connecting the urea water tank 174 to the urea water supply device 175 arranged on the right side of the threshing device 5 (the grain tank 7 side) can be configured to be short.

[0075] 19 and 20, the urea water tank 174 is disposed inside the side cover 41 and to the left of the fuel tank 31. The urea water tank 174 is configured in an L-shape that covers the lower and rear sides of the left side surface of the fuel tank 31. The urea water tank 174 is configured to surround the lower and rear sides of the fuel filler opening 32 that protrudes from the upper left side surface of the fuel tank 31 toward the outside of the aircraft (left side).

[0076] The urea water tank 174 is provided in the front-to-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 way, the installation space of the fuel tank 31 can be utilized to install the urea water tank 174 compactly, and the fuel filler 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.

[0077] In this embodiment, the urea water tank 174 may be formed integrally 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. In addition, 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 filler port 32 of the fuel tank 31 is inserted into this opening 174d.

[0078] At this time, by making the connection portions between the tank portion 174c and the urea water supply pipe 179 and the urea water return pipe 180 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.

[0079] <Fifth embodiment> Next, a fifth embodiment of the present invention will be described with reference to Figures 22 to 29. Note that the combine harvester of this embodiment differs from the third embodiment in that the urea water tank 174 behind the grain tank 7 is disposed so as to overlap the fuel tank 31. As the other configurations are the same as those of the combine harvester of the third embodiment, detailed description thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

[0080] 22 and 23, the urea water tank 174 is placed under the threshing device 5, overlapping 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 positioned close to each other, thereby reducing the burden on refueling and water supply operations.

[0081] 22 and 23, a urea-water tank 174 for storing urea water is arranged behind the threshing device 5, below the machine frame 36 (second trough 39) and the oscillating sorting plate 57 that constitute the frame body of the threshing device 5, and overlaps with the fuel tank 31. The urea-water tank 174 and the fuel tank 31 are arranged one above the other inside the side cover 41 that covers 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 also allows the piping (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 of the threshing device 5 (grain tank 7 side) to be shortened.

[0082] 22 and 23, the upper portion 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 fit the top surface of the fuel tank 31, the urea water tank 174 is installed on the fuel tank 31 so that the top surface of the fuel tank 31 is covered by the bottom 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 on the fuel tank 31.

[0083] The urea water tank 174 is configured to be detachable from the fuel tank 31. In this case, the urea water tank 174 may be configured to be detachable by sliding it left and right relative to the fuel tank 31, or the urea water tank 174 may be fitted and removed up and down relative to the fuel tank 31. In this case, the connection portions 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 using a quick coupler or the like. In this way, by configuring the urea water tank 174 to be detachable from the fuel tank 31, 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 in the quality of the urea water.

[0084] 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, and is disposed 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, which improves the heat retention effect inside the urea water tank 174 and suppresses deterioration of the urea water stored in the urea water tank 174.

[0085] 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 opening 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 positioned on the lower left side of the fuel tank 31, and the cutout 31a of the fuel tank 31 covers the top surface and right side surface of the urea water tank 174.

[0086] 25 , the fuel tank 31 is fixed to the traveling vehicle body 1 by a tank support body (support belt) 33. At this time, the fuel tank 31 is fixed by the tank support body 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 vehicle body 1 by the tank support body 33. In addition, since the tank support body 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 body 33.

[0087] Next, a second modified example of this embodiment will be described below with reference to Figures 27 to 29. In this modified example, as shown in Figures 27 to 29, the urea water tank 174 is disposed below the fuel tank 31 and is surrounded by the fuel tank. The urea water tank 174 has a convex portion 174x that protrudes above the water supply port 174a. By providing the convex portion 174x that extends above the water supply port 174, a space that is not filled with urea water can be secured within 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 can be prevented from exceeding the volume of the urea water tank 174, thereby preventing damage to the urea water tank 174.

[0088] 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 above the water supply port 174a at a position offset from the fuel filler 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.

[0089] 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 with water, 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 increased 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.

[0090] <Notes on the invention> One embodiment of a combine harvester is a combine harvester equipped with an engine as a power source mounted on a running body, an exhaust gas purification device consisting of a first case that removes particulate matter from the engine's exhaust gas and a second case that removes nitrogen oxide substances from the engine's exhaust gas, an engine room in which the engine is installed, a threshing device that threshes grain, and a grain tank located behind the engine room and into which the grain threshed by the threshing device is transported, the exhaust gas purification device is arranged in a recess in the grain tank facing the engine room, and an exhaust connecting pipe connecting the engine to the exhaust gas purification device is arranged below a frame that forms the engine room, and an inlet pipe provided on the exhaust gas purification device is connected to the exhaust connecting pipe.

[0091] In the above combine, the first case and the second case may be arranged so that their respective longitudinal directions are aligned along the front-to-rear direction of the traveling body, and the inlet pipe may be provided at a location on the first case opposite the engine.

[0092] In the combine harvester, the inlet pipe may be arranged on a lower surface side of the first case.

[0093] According to the above configuration, the grain tank has the exhaust gas purification device disposed in a recess facing the engine compartment, an exhaust manifold connecting the engine to the exhaust gas purification device disposed below a frame forming the engine compartment, and an inlet pipe of the exhaust gas purification device communicates with the exhaust manifold, thereby enabling a short path between the engine and the exhaust gas purification device between the grain tank and the engine compartment and enabling exhaust heat from the engine to be guided to the exhaust gas purification device, thereby maintaining a high purification effect of the exhaust gas purification device. [Explanation of symbols]

[0094] 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 water tank 175 Urea water supply equipment 229 Case 2 236 SCR inlet pipe (exhaust gas intake) 237 SCR outlet pipe (exhaust gas outlet) 239 Urea mixing tube

Claims

1. An engine room with an engine, a threshing device for performing threshing processing; A grain tank located to the side of the threshing device and to the rear of the engine room, for storing threshed grains; An exhaust gas purification device that treats exhaust gas from the engine, The exhaust gas purification device includes: a first case for removing particulate matter contained in exhaust gas from the engine; a second case for removing nitrogen oxides contained in the exhaust gas after the treatment in the first case; Exhaust gas is introduced from the first case into the second case through a urea mixing pipe, The second case is arranged so as to overlap the grain tank in a plan view and a front view, A recess is formed on the front left side of the grain tank, on a surface facing the threshing device and the engine room, and the second case is disposed in a state of being inserted into the recess. combine.

2. The second case overlaps with the grain tank in a side view. The combine harvester according to claim 1.

3. The second case is located rearward of the front surface of the grain tank. The combine harvester according to claim 1 or 2.

Images