Combine-harvester

Abstract

To improve a combine-harvester equipped with a reductant tank.SOLUTION: A combine-harvester comprises: an engine being a power source mounted on a traveling machine body; an exhaust gas purification device that removes a nitrogen oxide substance in the exhaust gas of the engine; a reductant tank that stores a reductant supplied to the exhaust gas purification device; and a grain tank that carries in harvested grain. The reductant tank is positioned on the traveling machine body rear side and at a position that overlaps with the grain tank in a side view.SELECTED DRAWING: Figure 2

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 installed therein (hereinafter referred to as a DPF case) and a case with a selective catalytic reduction catalyst installed therein (hereinafter referred to as an SCR case) are provided in the exhaust path of a diesel engine as an exhaust gas purification device (exhaust gas aftertreatment device), 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). [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 Summary of the Invention [Problem to be solved by the invention]

[0004] When using the selective catalytic reduction (SCR) method to remove nitrogen oxides from exhaust gas, a reducing agent (e.g. urea) must be supplied. Therefore, when installing an SCR denitration device on a combine harvester, not only the SCR case but also space is required to install the reducing agent tank that contains the reducing agent.

[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-mentioned object, the present invention provides a combine harvester comprising an engine as a power source mounted on a running body, an exhaust gas purification device that removes nitrogen oxide substances in the exhaust gas of the engine, a reducing agent tank that contains a reducing agent to be supplied to the exhaust gas purification device, and a grain tank for transporting harvested grain, wherein the reducing agent tank is positioned behind the running body and in a position that overlaps with the grain tank when viewed from the side. [Brief description of the drawings]

[0007] [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 perspective view showing the positional relationship between the engine peripheral parts, the grain tank, and the thresher. [Diagram 5] FIG. 2 is a front view showing the configuration of the exhaust gas purification device and its surroundings. [Figure 6] FIG. 2 is a rear perspective view of the exhaust gas purification device mounting portion. [Figure 7] FIG. 7 is an enlarged explanatory view of FIG. [Figure 8] FIG. [Figure 9] FIG. 2 is a perspective view showing the arrangement of an engine and an exhaust gas purification device. [Figure 10] FIG. 2 is a perspective view showing a support structure for the exhaust gas purification device. [Figure 11] FIG. 2 is a rear perspective view showing a support structure for the exhaust gas purification device. [Figure 12] FIG. 2 is a perspective view showing the configuration of the exhaust gas purification device and the urea water supply device and their surroundings. [Figure 13]FIG. 2 is a perspective view showing a configuration around an exhaust gas purification device mounting portion. [Figure 14] FIG. [Figure 15] FIG. 1 is a rear perspective view showing the arrangement of the grain tank and vertical take-out conveyor. [Figure 16] FIG. 4 is a plan view showing a state in which the rear cover is open. [Figure 17] FIG. 4 is a rear view showing the arrangement of the urea water tank. [Figure 18] FIG. 4 is a right side view showing the arrangement of the urea water tank. [Figure 19] FIG. 13 is a plan view showing the rotation of the grain tank. [Figure 20] FIG. 13 is an enlarged plan view showing the rotation of the grain tank. [Figure 21] FIG. 2 is a plan view, partially in section, of a recess in the grain tank; [Figure 22] FIG. 4 is a schematic diagram for explaining the supply of urea water. [Diagram 23] FIG. 4 is a rear view showing the replenishing stand and the urea water tank. [Figure 24] FIG. 4 is a right side view showing the supply stand and the urea water tank. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <First embodiment> A first embodiment of the present invention will be described below with reference to Figs. 1 to 20. 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 4. In the following description, the left side of the traveling body 1 as viewed in the forward direction will be simply referred to as the left side, and the right side as viewed in the forward direction will be simply referred to as the right side.

[0009] As shown in Figures 1 to 4, the farm has a traveling body 1 supported by a pair of left and right traveling crawlers 2 that serve as a traveling section. A 6-row harvesting device 3 that harvests and collects stalks is attached to the front of the traveling body 1 so that it can be adjusted up and down about a harvesting 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 that stores grains 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.

[0010] 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 front side outside the machine, and is configured to rotate forward around the cabin rotation fulcrum shaft 10a.

[0011] 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.

[0012] 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.

[0013] 1 and 2, the fuel tank 31 that contains 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 inlet 32 ​​is extended to the left side of the threshing device 5, making it possible to refuel from the outside of the machine.

[0014] 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 6-row culm raising device 53 for raising the uncut culms planted in the field is disposed in front of the harvesting frame 51. A culm conveying device 54 for conveying the harvested culms cut by the cutting blade device 52 is disposed between the culm raising device 53 and the front end (feed start end side) of the feed chain 6. In addition, a 6-row grass dividing body 55 for dividing the uncut culms is protrudingly provided in front of the lower part of the culm raising device 53. The harvesting device 3 is configured to continuously cut the uncut culms planted in the field while moving in the field.

[0015] 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 from the harvesting device 3 by the stump 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.

[0016] As shown in Fig. 1, below the oscillating sorting plate 57, there are provided a first conveyor 61 for removing the grains (first grade) selected by the oscillating sorting plate 57, and a second conveyor 62 for removing the second grade such as grains with stalks. The oscillating sorting plate 57 is configured so that the culled 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 the sorting wind 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 are collected in the grain tank 7.

[0017] 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.

[0018] 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.

[0019] 4 to 13, 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 removes particulate matter in the exhaust gas of the diesel engine 14. The second case 229 (exhaust gas purification case) constitutes an SCR system that removes nitrogen oxides in the exhaust gas of the diesel engine 1.

[0020] 4 to 9, exhaust gas purification device 74 includes a continuous regeneration type first case 75 into which exhaust gas from diesel engine 14 is introduced. First case 75 as an exhaust gas purification case is formed in a long cylindrical shape extending long in the front-to-rear direction, and includes an inlet case 76 and an outlet case 77. Inside inlet case 76 and outlet case 77, a diesel oxidation catalyst 79 made of platinum or the like that generates nitrogen dioxide (NO2) and a honeycomb-structured soot filter 80 that continuously oxidizes and removes trapped particulate matter (PM) at a relatively low temperature are arranged in series in the direction of exhaust gas movement (from front to rear).

[0021] 4 to 9, a purification inlet pipe 81 serving as an exhaust gas inlet pipe is welded and fixed to the inlet case 76, and one end of a purification outlet pipe 82 serving as an exhaust gas outlet pipe is bolted to the outlet case 77. One end of a urea mixing pipe 239 (exhaust pipe) described later is flange-fastened to the other end of the purification outlet pipe 82, and the urea mixing pipe 239 is connected to the purification outlet pipe 82. The exhaust gas from the diesel engine 14 is introduced into the first case 75 from the purification inlet pipe 81, and the exhaust gas in the first case 75 is discharged from the purification outlet pipe 82 to the urea mixing pipe 239. The inlet case 76 and the outlet case 77 are detachably fastened to a plurality of sets of thick plate-shaped intermediate flange bodies 84 and a plurality of bolts.

[0022] With the above-described configuration, nitrogen dioxide (NO2) generated by the oxidation action of the diesel oxidation catalyst 79 is supplied into the soot filter 80 from one end surface (the intake end surface). Particulate matter (PM) contained in the exhaust gas of the diesel engine 14 is collected by the soot filter 80 and is continuously oxidized and removed by the 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.

[0023] 4 to 9, the exhaust gas purification device 74 for purifying the exhaust gas discharged from each cylinder of the diesel engine 1 includes a second case 229 as a selective catalytic reduction (SCR) system for removing nitrogen oxide substances in the exhaust gas of the diesel engine 1. As shown in Figs. 4 and 7, like the first case 75, the second case 229 is formed in an elongated cylindrical shape extending long in the front-rear direction, and the second case 229 is configured to reduce nitrogen oxide substances (NOx) by incorporating an SCR catalyst 232 for urea selective catalytic reduction and an oxidation catalyst 233. An SCR inlet pipe 236 for taking in exhaust gas and an SCR outlet pipe 237 for discharging exhaust gas are provided at the upper and lower ends (one end side and the other end side in the exhaust gas movement direction) of the second case 229.

[0024] 7 and 8, an SCR outlet pipe 237 is provided at the rear end of the second case 229 via an outlet pipe bracket 150, and a urea injection unit 240 at the rear end of the urea mixing pipe 239 is fastened and fixed to the outlet pipe bracket 150 via a pipe support 151, and the urea injection unit 240 at the rear end of the urea mixing pipe 239 is detachably connected to the purification outlet pipe 82 at the rear end of the first case 75 via a bolt fastening flange 152. On the other hand, an SCR inlet pipe 236 is connected to the front end side of the urea mixing pipe 239, and the SCR inlet pipe 236 is connected to the purification outlet pipe 82 via the urea mixing pipe 239, so that exhaust gas from the first case 75 is introduced into the second case 229. Urea water (reducing agent) from a urea water tank 174 (reducing agent tank) described later is supplied into the urea mixing pipe 239, and the urea water is hydrolyzed and mixed as ammonia in the exhaust gas flowing from the first case 75 to the second case 229. It is also possible to use other reducing agents, such as anhydrous ammonia or ammonia water, instead of urea water. The exhaust gas from 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.

[0025] 6 to 8, the tail pipe 83 is supported on the upper surface of the threshing device 5. A pipe bracket 246 is bolted to the right side of the upper surface of the threshing device 5, and the pipe bracket 246 is erected on the upper surface of the threshing device 5 (the threshing upper surface frame at the upper corner of the right side of the threshing machine case), and the lower end side of the rear pipe support 248 is bolted to the upper end side of the pipe bracket 246, and the rear end side of the tail pipe 83 is fixed to the upper end side of the rear pipe support 248, with the exhaust gas outlet on the rear end side of the tail pipe 83 opening toward the rear of the machine body. 8, 10 and 11, a pipe bracket 247 is provided on the upper surface of a lower bracket 245 which is welded and fixed to the rear end of the case support front / rear frame 250 described later, the lower end side of a front pipe support 249 is bolted to the pipe bracket 247, the front end side of the tail pipe 83 is fixed to the upper end side of the front pipe support 249, and the front end side of the tail pipe 83 is connected to the SCR outlet pipe 237, so that exhaust gas from the second case 229 is discharged from the tail pipe 83.

[0026] With the above-mentioned configuration, in the exhaust gas purification device 74, first, the oxidation catalyst 79 and the soot filter 80 in the DPF 75 reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 14. Next, inside the urea mixing pipe 239, the urea water from the urea injection unit 240 is mixed with the exhaust gas from the diesel engine 14, and the SCR catalyst 232 and the oxidation catalyst 233 in the second case 229 reduce nitrogen oxides (NOx) in the exhaust gas mixed with the urea water as ammonia. Then, the exhaust gas purified in the second case 229 is discharged from the tail pipe 83 toward the upper side of the rear of the threshing device 5. A gap is formed at the connection between the small-diameter SCR outlet pipe 237 and the large-diameter tail pipe 83, and outside air is sucked into the tail pipe 83 through the gap, and the outside air is mixed with the exhaust gas from the SCR outlet pipe 237, and the exhaust gas with a lowered exhaust temperature is discharged from the tail pipe 83.

[0027] As shown in Figures 3 to 5, the grain tank 7 has a purification device installation recess 7a formed by cutting out the left side of the front surface, a grain discharge conveyor installation recess 7b formed by a groove in the front-rear direction on the left side of the top surface, a grain lifting conveyor installation recess 7c formed by a step in the up-down direction in the center of the left side surface, and a urea water tank installation recess 254 formed by cutting out the outer corner of the traveling body 1 on the rear side surface. A space is provided behind the engine 14 in the purification device installation recess 7a on the front surface of the grain tank 7, and an exhaust gas purification device 74 is disposed therein. The grain discharge conveyor installation recess 7b on the top surface of the grain tank 7 accommodates the grain discharge conveyor 8, the tip of which is accommodated in the conveyor support 90, along the grain discharge conveyor installation recess 7b. A grain lifting conveyor 63 is disposed in the recess 7c for installing the grain lifting conveyor on the left side of the grain tank 7, and the rice discharge port at the top of the grain lifting conveyor 63 is connected to a receiving port provided at the top of the recess 7c for installing the grain lifting conveyor. A urea water tank 174, which will be described later, is disposed in the recess 254 for installing the urea water tank at the outer corner of the traveling body 1 on the rear side of the grain tank 7.

[0028] As shown in Figures 1 to 5, 15 and 16, a transverse conveyor 8b is disposed 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 transverse conveyor 8b. In addition, an outer bottom plate 7d and an inner bottom plate 7e are provided at the bottom of the grain tank 7, and the outer bottom plate 7d and the inner bottom plate 7e are inclined toward the transverse conveyor 8b, so that the grains inside the grain tank 7 flow down in the direction of the transverse conveyor 8b. The transverse conveyor 8b extends 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.

[0029] The vertical take-out conveyor 8a is connected at its lower end to a lower end side transfer case 8c provided at the rear end of the horizontal feed conveyor 8b protruding from the rear end face of the grain tank 7, and is extended upward along the rear end face of the grain tank 7. The grain discharge conveyor 8 is connected at its rear end to an upper end side transfer case 8d connected to the upper end of the vertical take-out conveyor 8a, and is extended forward. Therefore, grains transported from the horizontal feed conveyor 8b of the grain tank 7 are carried into the vertical take-out conveyor 8a through the lower end side transfer case 8c. Then, when the grains are transported upward in the vertical take-out conveyor 8a, they are carried into the grain discharge conveyor 8 through the upper end side transfer case 8d. Furthermore, in the grain discharge conveyor 8, the grains are transported forward and discharged from the rice husk throwing port 9.

[0030] The lower end (base end) side of the vertical take-out conveyor 8a is connected to the grain tank 7 via a lower end side transfer case 8c. In addition, the bottom of the lower end side transfer case 8c is fitted to a protrusion 40 provided on the traveling body 1, and the grain tank 7 to which the lower end side transfer case 8c is fixed is rotatably supported relative to the traveling body 1. The vertical take-out conveyor 8a includes a lower side cylinder case 41 connected to the lower end side transfer case 8c and an upper side cylinder case 42 connected to the upper end side transfer case 8c, and the upper side cylinder case 42 is rotatably connected to the lower side cylinder case 41.

[0031] The upper cylindrical case 42 has a swivel gear 43 on the outer circumferential surface at the lower end, and this swivel gear 43 meshes with a gear (not shown) provided on the rotating shaft of a swivel motor (actuator) 44, so that it can rotate based on the rotation from the swivel motor 44. The upper part of the upper cylindrical case 42 is held by a U-shaped support 45 whose both ends are connected to the rear side of the grain tank 7, and the lower part is held by a U-shaped support 47 connected to the upper end of a support frame 46 erected from the traveling machine body 1. In other words, the upper cylindrical case 42 is pivotally supported by the supports 45, 47 fixed to the grain tank 7 and the support frame 46 so that it can rotate. As a result, when the upper cylindrical case 42 is rotated by the swivel motor 44, the grain discharge conveyor 8 rotates relative to the grain tank 7 (with the vertical take-out conveyor 8a as the rotation axis).

[0032] The lower end (base end) of the lower cylindrical case 41 is fixed to the grain tank 7 via the lower end transfer case 8c, while the upper end is fitted to the upper cylindrical case 42, so that the upper cylindrical case 42 can rotate with respect to the lower cylindrical case 41. The turning motor 44 is placed and fixed on a motor fixing bracket 48 provided on the side of the support 47, and the turning gear 43 of the upper cylindrical case 42 is engaged with a gear provided on the tip of the motor shaft of the turning motor 44 protruding from the bottom surface of the motor fixing bracket 48. A U-shaped support 49 that holds the upper part of the lower cylindrical case 41 is fixed to the bottom surface of the motor fixing bracket 48. That is, the lower end of the lower cylindrical case 41 is fixed to the grain tank 7, while the upper end is pivotally supported by the support 49 fixed to the support frame 46.

[0033] As shown in Figures 5, 7 and 8, a lock pin 161 and a lock arm 162 are provided to fix and support the grain tank 7 in the storage position of the traveling body 1, and the lock pin 161 is fixed to the upper right surface of the threshing device 5, and the lock arm 162 is attached to the left side of the front of the grain tank 7. A lock pin fixing frame 160 is provided on the right side of the upper surface of the threshing device 5, and the lock pin 161 is fixed to the tip of the lock pin fixing frame 160. In addition, a lock release lever 164 is attached to the front of the grain tank 7, and the lock release lever is connected to the lock arm 162 via a linking rod 163, so that the lock pin 161 can be released from the lock arm 162 by operating the lock release lever. The grain tank 7 can be rotated around the axis of the vertical take-out conveyor 8a by releasing the lock arm 162 with the lock release lever.

[0034] Wheels 167 that slide on the traveling body 1 are journaled on the lower edge of the front end face of the grain tank 7, and the wheels 167 move left and right on the traveling body 1, so that the grain tank 7 can be opened and closed while supporting the front of the grain tank 7. In addition, a rail 168 that receives the wheels 167 of the grain tank 7 is provided on the right side (outside the machine) of the traveling body 1. The rail 168 has a shape that is bent downward toward the outside of the machine (right side), and guides the wheels 167 to the upper surface of the traveling body 1 so that the grain tank 7 can be mounted on the traveling body 1 when the grain tank 7 that is open to the outside of the machine (right side) is closed. In addition, a positioning member 169 is provided on the lower edge of the front end face of the grain tank 7. The positioning member 169 is made of a plate member provided on the outside of the machine (right side) of the wheels 167, and its outside (right side) end is bent downward in a shape that matches the bending of the rail 168. Therefore, when the grain tank 7 is closed, the bent portion of the positioning member 169 abuts against the bent portion of the rail 168, thereby fixing the installation position of the grain tank 7.

[0035] The vertical take-out conveyor 8a is fixed to the grain tank 7 so as to stand along the rear end surface of the grain tank 7, and is rotatably supported by the protrusion 40 and the supports 45, 47, 49. The front end surface of the grain tank 7 is supported by a wheel 167 that slides on the traveling machine body 1. Therefore, the grain tank 7 can be rotated 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 described later can be opened. In addition, a rear cover 30 that covers the periphery of the vertical take-out conveyor 8a is provided at the rear of the grain tank 7 so as to be able to be opened and closed. In addition, a bottom cover body 165 is provided detachably on the outer surface of the machine-exterior bottom plate 7d of the grain tank 7.

[0036] Next, as shown in Figs. 9 to 11, an engine room frame 91 is erected on the traveling body 1, and the rear side of the diesel engine 14 mounted on the upper surface side of the traveling body 1 is surrounded by the engine room frame 91. The engine room frame 91 has a square pipe-shaped left support body 92 arranged on the left, an inverted U-shaped right support body 93 arranged on the right, and a square pipe-shaped horizontal frame 94 whose both ends are integrally fixed to the left and right support bodies 92, 93a. One end of the horizontal frame 94 is connected to the upper end of the left support body 92, while the other end is connected and fixed to a square pipe-shaped vertical frame 93a fixed to the upper part of the right support body 93. As shown in Fig. 1, 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 storage position via the conveyor support 90.

[0037] In addition, rubber pressure-contact legs (not shown) provided on the rear bottom surface of the driver's cabin 10 abut against the upper surfaces of the left and right support pedestals 96 of the horizontal frame 94 from above, so that the rear part of the driver's cabin 10 is supported on each support 96 of the horizontal frame 94 so as to be movable toward and away from each other 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.

[0038] 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 97, 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.

[0039] As shown in Fig. 4 and Fig. 9, a turbocharger 118 for forcibly feeding air into the diesel engine 14 is disposed at an exhaust gas outlet (exhaust manifold 115) of the diesel engine 14. The turbocharger 118 is disposed at the upper front side of the diesel engine 14, and a compressor case 118a incorporating a blower wheel is disposed on the right side of the turbocharger 118, while a turbine case 118b incorporating a turbine wheel is disposed on the left side of the turbocharger 118. The intake side of the compressor 118a disposed at the right end communicates with the intake and exhaust side of the air cleaner 123 via an intake pipe 120. Meanwhile, an exhaust outlet pipe 99 disposed at the left end of the turbine case 118b is connected to an exhaust connection pipe 119 connected to an exhaust gas inlet (DPF inlet pipe 81) of the exhaust gas purification device 74, which is an aftertreatment device, via a bendable bellows-shaped exhaust introduction pipe 98.

[0040] 3, 4 and 9, 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 118b side. Since the intake path and the exhaust path of the engine 14 including the turbocharger 118 are arranged on the left and right sides in this manner, 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.

[0041] Next, the mounting structure and the support structure of the exhaust gas purification device 74 will be described with reference to Figs. 4 to 13. As a sandwiching body for arranging the first case 75 and the second case 229 in parallel, a pair of front case fixing bodies 100 and a rear case fixing body 101 and four fastening bands 85 are provided. The first case 75 is fixed to the left-side mounting portion of the front case fixing body 100 and the rear case fixing body 101 by the front and rear fastening bands 85, and the second case 229 is fixed to the right-side mounting portion of the front case fixing body 100 and the rear case fixing body 101 by the front and rear fastening bands 85. Two fastening bands 85 are attached to each of the upper surfaces of the first case 75 and the second case 229 in a half-wound shape, and the lower end side of each fastening band 85 is fastened to each of the case fixing bodies 100, 101 by a bolt. As a result, the first case 75 and the second case 229, which are cylindrical and long in the front-rear direction, are horizontally arranged.

[0042] A pair of right and left support frame bodies 102 and 103 made of sheet metal with L-shaped end faces are bolted to the left and right ends of the front case fixed body 100 and the rear case fixed body 101 so that their mounting positions (support postures) can be adjusted, and the case fixed bodies 100, 101 and the support frame bodies 102, 103 are connected in a square frame shape. The first case 75 and the second case 229 are fixed to them via fastening bands 85, thereby forming an exhaust gas purification device 74 as an exhaust purification unit. In addition, the inner diameter of the bolt through holes of the support frame bodies 102, 103 is made larger than the outer diameter of the bolts connecting the case fixed bodies 100, 101 and the support frame bodies 102, 103, so that the bolts are loosely inserted into the bolt through holes of the support frame bodies 102, 103.When the case fixed bodies 100, 101 and the support frame bodies 102, 103 are fixed to each other, the bolts are screwed into the case fixed bodies 100, 101 while maintaining the connection posture of the support frame bodies 102, 103 relative to the case fixed bodies 100, 101 in a predetermined posture, and the support frame bodies 102, 103 are bolted to the case fixed bodies 100, 101.

[0043] The right support frame body 102 is fixed to the case support front and rear frames 250 and the case support bracket 253, thereby supporting the exhaust gas purification device 74 on the traveling machine body 1. The case support front and rear frames 250 support the right support frame body 102 via brackets 250a, 250b. The case support bracket 253 supports the left support frame body 103.

[0044] 4 and 8 to 12, the case support front-rear frame 250 is disposed on the right side of the threshing device 5 so that its longitudinal direction is approximately the front-rear direction, and is disposed below the purification device installation recess 7a provided on the front left side (threshing device 5 side) of the grain tank 7. The front end of the case support front-rear frame 250 is disposed to the left of the rear end, and the longitudinal direction of the case support front-rear frame 250 is inclined with respect to the front-rear direction.

[0045] The case support front / rear frame 250 is disposed so that its longitudinal direction is approximately horizontal. The front end of the case support front / rear frame 250 is connected to a midway point of the horizontal frame 94, approximately at the center in the longitudinal direction (left / right direction). The frames 94 and 250 are connected by bolting a case support bracket 94a, which is provided straddling from the upper surface to the rear surface of the frame 94, to a front end bracket 250d, which is provided on the front end surface of the frame 251.

[0046] The rear end side of the case support front / rear frame 250 is supported by a case support column frame 251 erected on the traveling vehicle body 1. The frames 250 and 251 are connected by bolting an upper end bracket 251a provided on the upper end surface of the frame 251 to a lower surface bracket 250c provided on the lower surface of the middle part of the rear end side of the frame 250 at a distance from the rear end surface of the frame 250. A lower bracket 250a protruding to the right side is welded and fixed to the middle part of the case support front / rear frame 250 forward of the lower surface bracket 250c.

[0047] The lower bracket 250a is disposed rearward of the center position in the longitudinal direction of the frame 250 (between the center position and the lower bracket 250c). The upper bracket 250b is fixedly welded to the upper surface of the lower bracket 250a. The lower surface of the right support frame body 102 is detachably fixed to the upper surface of the upper bracket 250b with bolts. The height position of the upper surface of the upper bracket 250b is higher than the height positions of the upper surface of the horizontal frame 94 and the upper surfaces of the case support front / rear frame 250.

[0048] As shown in Figures 4, 5 and 8, the left support frame body 103 is supported on the upper surface of the threshing device 5. The case support bracket 253 is bolted to the right side of the upper surface of the threshing device 5, and the lower surface of the left support frame body 103 is bolted to the upper surface of the case support bracket 253. The case support bracket 253 is bolted to the case support reinforcement member 228 attached to the upper right threshing frame 227 of the threshing device 5, sandwiching the threshing device 5 housing. The case support reinforcement member 228 has a plurality of ribs provided perpendicular to the contact surface with the threshing device 5 housing at the installation position of the case support bracket 253. In addition, the case support bracket 253 is attached to the upper surface of the threshing device 5 so that the contact surface between the bracket 253 and the left support frame body 103 and the contact surface between the upper bracket 250b and the right support frame body 102 are approximately at the same height position. In this way, as shown in Figures 4 and 5, the first case 75 and the second case 229 are supported at an upper position in the recess 7a of the grain tank 7.

[0049] 4, 7 and 9, the case support front / rear frame 250 is extended from the case support strut frame 251 side 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 81 of the first case 75, but also prevents interference with the air cleaner 123. Furthermore, since the case support front / rear frame 250 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.

[0050] 4 and 5, an exhaust gas purification device 74 having a first case 75 and a second case 229 is disposed in a recess 7a of the grain tank 7 provided on the surface of the grain tank 7 facing the engine room 97. This allows the exhaust gas purification device 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 purification device 74, which becomes hot. In addition, since the exhaust heat from the engine room 97 can be guided to the exhaust gas purification device 74, the exhaust gas purification device 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 purification device 74.

[0051] The first case 75 and the second case 229 of the exhaust gas purification device 74 are arranged side by side with the longitudinal direction being the front-rear direction. The first case 75 is arranged on the threshing device 5 side with respect to the second case 229. This allows the first case 75 to be arranged in a position close to the exhaust port of the engine 14, and the exhaust path from the engine 14 to the first case 75 is configured as a short path, so that the regeneration process in the first case 75 can be maintained at a high performance. Furthermore, since the second case 229 and the urea mixing pipe 239 are covered by the grain tank 7, 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, and the urea water can be prevented from freezing and the purification ability of the second case 229 can be maintained at a high level.

[0052] Moreover, 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 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 realized 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 position higher than the engine 14, water generated by condensation due to a drop in temperature when the engine 14 is stopped can be prevented from accumulating in the exhaust gas purification device 74.

[0053] Furthermore, the urea mixing pipe 239 connected between the purification outlet pipe 82 of the first case 75 and the SCR inlet pipe 236 of the second case 229 is arranged parallel to the longitudinal direction of the first case 75 and the second case 229. As a result, the first case 75, the second case 229 and the urea mixing pipe 239 are configured as an integrated unit structure, and the exhaust gas purification device 74 can be installed compactly inside the recessed portion 7a on the front surface of the grain tank 7. Therefore, while the installation space for the exhaust gas purification device 74 can be easily secured, the recessed portion 7a of the grain tank 7 can be configured narrow to secure the grain storage capacity of the grain tank 7.

[0054] 13, a purification device cover body 261 serving as a heat insulating member is provided on the right side of the upper surface of the threshing device 5. The purification device cover body 261 is disposed on the left side of the exhaust gas purification device 74 by having its front side fastened with bolts to the lock pin fixing frame 160 and its rear side fixed to a rod-shaped member erected on the upper right side of the housing of the threshing device 5. The purification device cover body 261 covers the left side (the threshing device 5 side) of the exhaust gas purification device 74. This allows the exhaust gas purification device 74 to be disposed in a high-temperature environment and reduces the impact of heat radiation from the exhaust gas purification device 74 on surrounding components.

[0055] 14 to 22, a urea water tank 174 that stores urea water (urea aqueous solution for selective catalytic reduction) and a urea water supply device 175 that supplies urea water to the urea water injection section 240 of the urea mixing tube 239 are provided. 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, whereby the urea water is sprayed into the urea mixing tube 239 from a urea water injection valve 178 (dosing module) of the urea water injection section 240.

[0056] As shown in Figures 14 to 18, the urea water tank 174 has a vertically long shape and is disposed in a recess 254 provided in the grain tank 7. Figure 17 shows a state in which the bottom cover body 165 and the right cover body 166 constituting the right side surface of the grain tank 7 above the bottom cover body 165 have been removed, and the inside of the grain storage section 260 in the grain tank 7 can be seen. The recess 254 is provided at the outer corner of the traveling body 1 on the rear side surface of the grain tank 7. The recess 254 has a bottom 254a on which the urea water tank 174 is mounted. In addition, a tank mounting stand 255 is disposed on the bottom 254a of the recess 254. The urea water tank 174 is mounted on the tank mounting stand 255. Since the grain tank 7 has the recess 254 in which the urea water tank 174 is disposed, a space for disposing the urea water tank 174 is secured without increasing the external dimensions of the combine. In addition, since the recess 254 has a bottom 254a on which the urea water tank 174 is mounted, no additional member is required for mounting the urea water tank 174. This allows for cost reduction compared to the case where an additional member is provided for mounting the urea water tank 174. Furthermore, since the recess 254 is provided on the rear side surface of the grain tank 7, the urea water tank 174 is not affected by heat from the engine 14.

[0057] As shown in FIG. 17 and FIG. 18, the urea water tank 174 is detachably fixed in the recess 254 by two bands 256 attached in a vertically aligned manner. The material of the bands 256 is, for example, a material having elasticity, and in this case, rubber. Ring fittings 257 are provided at both ends of each band 256. In addition, a total of four hook fittings 258 are fixed by welding to two locations on the left side of the recess 254 on the rear surface of the grain tank 7 and two locations on the inner surface 254b of the recess 254 on the front side of the traveling body 1. The bands 256 are attached to the grain tank 7 by attaching the ring fittings 257 to the hook fittings 258. In addition, the grain tank 7 is provided with a fall prevention stay 259 that prevents the urea water tank 174 from falling. One end of the fall prevention stay 259 is fixed to the rear surface of the grain tank 7 at a position on the left side of the recess 25 on the rear surface of the grain tank 7, and the other end is fixed to the inner surface 254b of the recess 254.

[0058] As shown in Figures 17, 18 and 22, a urea water tank sensor unit 271 is detachably attached to an upper opening of the urea water tank 174. The urea water tank sensor unit 271 includes a sensor unit body 272 that functions as a lid for the opening 5, a urea water supply pipe 179 (reducing agent piping), a urea water return pipe 180 (reducing agent piping), a cooling water feed pipe 273, a cooling water return pipe 274, a temperature sensor 183, a liquid level sensor 184, a urea water quality sensor 186 (e.g., a concentration sensor), and a sensor control unit 187. The urea water supply pipe 179 supplies urea water to the urea water supply device 175. The urea water return pipe 180 returns urea water from the urea water supply device 175 to the urea water tank 174. The sensor control unit 187 controls the operation of each of the sensors 183, 184, 186. The cooling water feed pipe 273 and the cooling water return pipe 274 are connected inside the urea water tank 174. The engine cooling water heated by the engine 14 is fed from the cooling water feed pipe 273 to the cooling water return pipe 274 and passed through the urea water tank 174, thereby preventing the urea water from freezing.

[0059] 22, the urea water supply device 175 includes a urea water pump 171 that pumps the urea water in a urea water tank 174, and a urea water supply electric motor 172 that drives the urea water pump 171. A urea water supply pipe 179 and a urea water return pipe 180 are connected between the urea water tank 174 and the urea water supply device 175. In addition, the urea water supply device 175 includes an engine controller 181 that executes fuel injection control of the diesel engine 14, and a urea injection controller 182 that controls the operation of the urea water supply device 175 and the urea water injector 178.

[0060] As shown in Figs. 12 and 14, the urea water supply device 175 is fixed by bolting to a pump support (supply device support) 185 which is welded to the left side and front side of a case support column frame 251 which supports the exhaust gas purification device 74 (second case 229). The urea water supply device 175 is attached to the left side of the upper end of the pump support column frame 185. The urea water supply device 175 and the pump support column 185 are disposed at a height position between the height position of the exhaust gas purification device 74 and the height position of the urea water tank 174. As shown in Figs. 4 to 8, the urea injection controller 182 is attached to the rear side of a controller support column 189 which is attached to the left side of the case support column frame 251. The controller support column 189 is bolted to a controller bracket 251b which is welded to the left side of the case support column frame 251.

[0061] As shown in Fig. 14 and Fig. 22, a urea water injection pipe 177 is provided to connect the urea water supply device 175 and the urea water injection valve 178. The urea injection controller 182 controls the operation of the urea water supply device 175 and the urea water injection valve 178 to spray and inject urea water from the urea water injection valve 178 into 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 cooling water feed pipe 275 and a cooling water return pipe 276 are connected between the urea water injection valve 178 and the engine 14. The ends of the cooling water feed pipe 275 and the cooling water return pipe 276 on the urea water injection valve 178 side are connected to a pipe connection portion provided in the urea water injection valve 178. The cooling water feed pipe 275 and the cooling water return pipe 276 are connected inside the urea water injection valve 178. The engine cooling water heated by the engine 14 is sent from the cooling water feed pipe 275 through the urea water injector 178 to the cooling water return pipe 276, thereby preventing the urea water from freezing inside the urea water injector 178.

[0062] 14, one end of the urea water injection pipe 177 is connected to a pipe connection provided at the rear of the urea water injection valve 178, and is led from the connection position to the left side, then led downward, and further passed under the purification outlet pipe 82, the urea injection unit 249, and the second case 229 to the urea water supply device 175. In addition, the cooling water feed pipe 275 and the cooling water return pipe 276 are led from the connection part with the urea water injection valve 178 approximately along the urea water injection pipe 177 to the bottom of the second case 229, and further passed near the lower side surface of the approximately central part in the longitudinal direction of the case support front and rear frame 250, led forward along the frame 250, and led downward at the front halfway part of the frame 250 to be led to the engine 14. With the above piping configuration, a compact piping configuration can be realized while reducing the influence of heat from the exhaust gas purification device 74 and the tail pipe 83.

[0063] The temperature sensor 183, the liquid level sensor 184, and the urea quality sensor 186 of the urea water tank sensor unit 271 are electrically connected to the urea injection controller 182. The temperature sensor 183, the upstream NOx sensor 188, and the downstream NOx sensor 189 are also electrically connected to the urea injection controller 182. The temperature sensor 183 detects the exhaust gas temperature in the urea water injection unit 249. The upstream NOx sensor 188 detects NOx in the exhaust gas that has passed through the diesel oxidation catalyst 79 and the soot filter 80 in the first case 75. The downstream NOx sensor 189 detects NOx in the exhaust gas that has passed through the SCR catalyst 232 and the oxidation catalyst 233 in the second case 229. The urea injection controller 182 controls the injection of urea water in response to the detection signals of the temperature sensor 183 and the NOx sensors 188, 189.

[0064] In addition, the engine controller 181 and the urea injection controller 182 are electrically connected. This allows the urea water to be supplied into the urea mixing pipe 239 at an appropriate time depending on the operating conditions of the diesel engine 14, etc. Furthermore, the supply of engine cooling water to the cooling water feed pipe 273 and the cooling water return pipe 274 is performed by opening and closing a valve 277 provided in the cooling water feed pipe 273 under the control of the urea water injection controller 182. This allows the urea water in the urea water tank 174 to be heated at an appropriate time depending on the temperature condition of the urea water in the urea water tank 174, etc.

[0065] 14, the urea water supply pipe 179 and the urea water return pipe 180 are first led upward from the urea water supply device 175, then bent rearward and led behind the rear surface of the pump support 185 to the rear side of the case support column frame 251, then led along the rear side of the case support column frame 251 to the traveling machine body 1 side, and then led below the grain tank 7 to the urea water tank 174 side. In addition, the cooling water feed pipes 273, 275 and the cooling water return pipes 274, 276 are led from the engine 14 to a front midway portion of the lower side of the case support front / rear frame 250, then led rearward along the frame 250 to the rear side of the case support column frame 251. Furthermore, the cooling water feed pipe 273 and the cooling water return pipe 274 are led along the urea water supply pipe 179 and the urea water return pipe 180 to the traveling body 1 along the rear side of the case support column frame 251, and are led to the urea water tank 174 side through below the grain tank 7. The cooling water feed pipe 275 and the cooling water return pipe 276 are led to the urea water injection valve 178 from the rear side of the case support column frame 251. The above piping configuration makes it possible to realize a compact piping configuration. Also, the urea water supply device 175 and the piping can be easily assembled. The piping 179, 180, 273 to 276 are positioned by piping clamps (not shown) attached to the traveling body 1, the rear side of the grain tank 7, the case support front and rear frames 250, the case support column frame 251, etc.

[0066] In addition, the fact that the urea water supply device 175 is positioned higher than the urea water tank 174 and lower than the urea water injection valve 178 has the effect of causing the urea water remaining in the urea water injection valve 178, the urea water injection pipe 177, etc. to flow toward the urea water supply device 175 after the injection of urea water stops due to the height difference between the urea water supply device 175 and the urea water injection valve 178.

[0067] Next, as shown in Figs. 15 to 20, the grain tank 7 is provided to be rotatable on the outside of the traveling body 1 with the vertical take-out conveyor 8a (support member) provided on the rear side of the traveling body 1 of the grain tank 7 as a pivot point. In the grain tank 7, the recess 254 is provided on the side (rear surface) of the grain tank 7 that is close to the vertical take-out conveyor 8a (pivot point). This allows the urea water tank 174 to be located near the pivot point. This reduces the deflection of the urea water supply pipe 179, the urea water return pipe 180, the cooling water feed pipe 273, and the cooling water return pipe 274 when the grain tank 7 is rotated. In addition, by rotating the grain tank 7 to the outside of the traveling body 1, the right side of the threshing device 5 and the rear side of the engine room 97 can be opened, so that an operator can easily perform various operations such as maintenance of the exhaust gas purification device 74 and the urea water supply device 175.

[0068] As shown in Figs. 15 to 20, the recess 254 is provided at a position outside the traveling body 1 from the vertical take-out conveyor 8a (rotation fulcrum). Furthermore, the urea water supply pipe 179, the urea water return pipe 180, the cooling water feed pipe 273, and the cooling water return pipe 274 connected to the urea water tank 174, and their portions facing the rear side of the grain tank 7 are led from the urea water tank 174 to the center side of the traveling body 1 from the vertical take-out conveyor 8a in the left-right direction of the traveling body 1. This prevents the pipes 179, 180, 274, and 275 from interfering with the rotation of the grain tank 7. Furthermore, the pipes 179, 180, 274, and 275 are led from a position closer to the center of the traveling body 1 than the vertical take-out conveyor 8a, passing below the grain tank 7, to the exhaust gas purification device 74 side. This configuration also prevents tubes 179, 180, 274 and 275 from interfering with the rotation of grain tank 7.

[0069] As shown in Figures 2, 3, 15 and 19 to 21, a rear cover 30 is provided at a corner portion on the outer rear side of the traveling body 1 of the grain tank 7. The rear cover 30 is supported on the grain tank 7 so as to be rotatable towards the outside of the traveling body 1 via two hinges 192 attached to the corner portion of the grain tank 7. When the rear cover 30 is closed, it covers the urea water tank 174. This can reduce exposure of the urea water tank 174 to direct sunlight.

[0070] In addition, the water supply port 174a of the urea water tank 174 cannot be seen from the side of the combine body when the rear cover 30 is closed. In other words, the rear cover 30 must be opened when supplying water to the urea water tank 174. On the other hand, the fuel supply port 32 of the fuel tank 31 is extended to the left side of the threshing device 5 and exposed to the outside of the machine, as described above. The operation of opening the rear cover 30 when supplying water to the urea water tank 174 prevents the fuel and urea water from being mixed up. In addition, the fuel supply port 32 of the fuel tank 31 and the water supply port 174a of the urea water tank 174 are arranged separately on the left and right sides of the traveling body 1, so that the fuel and urea water can be prevented from being mixed up.

[0071] <Second embodiment> 23 and 24 are explanatory diagrams of a modified example in which a supply stand on which a urea water supply container 263 can be mounted is provided near the urea water tank 174. The water supply port 174a of the urea water tank 174 is provided at a position higher than the waist of an operator, for example, and there has been a problem that the high height makes it difficult to supply water. Therefore, as shown in Figs. 23 and 24, a supply stand 280 may be provided which is attached to the vertical take-out conveyor 8a arranged on the rear side of the urea water tank 174.

[0072] The supply table 280 is attached to the vertical take-out conveyor 8a by a pair of supply table bands 281, 281 that surround the periphery of the vertical take-out conveyor 8a and a supply table support member 283. The band 281 has a substantially U-shaped shape that is divided into two at a curved portion of the shape. One end side of the band 281 (the curved portion of the substantially U-shaped shape) is connected by a mounting position adjustment bolt 284. The other end of the band 281 (the tip portion of the substantially U-shaped shape) is fastened to the supply table support member 283 by, for example, a bolt. The supply table support member 283 has a rod member 285 that serves as a rotation fulcrum for the supply table 280. The supply table 280 is provided so as to be rotatable from the substantially horizontal direction to the upward direction with the rod member 285 as a rotation fulcrum between the substantially horizontal direction and the substantially vertical direction.

[0073] As shown in FIG. 24, when supplying water to the urea water tank 174, the supply stand 280 is arranged in a substantially horizontal direction so that the water supply container 263 can be placed on the supply stand 280, and when the supply stand 280 is not in use, the tip of the supply stand 280 is arranged on the vertical take-out conveyor 8a side and the supply stand 280 is folded. By arranging the supply stand 280 in such a manner that it can be folded, the supply stand 280 can be stored compactly when not in use. In addition, since the supply stand 280 is attached to the vertical take-out conveyor 8a so as to rotate together with the vertical take-out conveyor 8a, it can be used at any time. In addition, the end of the band 281 opposite to the supply stand support member 283 is connected by a bolt 284, and by fastening the bolt 284, the height position and mounting angle of the supply stand 280 can be adjusted according to the use of the supply stand 280.

[0074] The combine harvester in the first and second embodiments includes an engine 14 that is a power source mounted on the traveling body 1, an exhaust gas purification device 74 that removes nitrogen oxides in the exhaust gas of the engine 14, a reducing agent tank 174 that stores a reducing agent to be supplied to the exhaust gas purification device 74, and a grain tank 7 that carries harvested grain. The grain tank 7 includes a reducing agent tank recess 254 in the middle of its side surface, in which the reducing agent tank 174 is mounted.

[0075] In the above combine harvester, the grain tank 7 is configured to be rotatable outside the traveling body 1, and a recess 254 for the reducing agent tank is provided near the rotation fulcrum of the grain tank 7. The traveling body 1 travels in the front-to-rear direction, and the rotation fulcrum of the grain tank 7 is provided at the rear of the grain tank 7, so that the grain tank 7 can rotate so that the front of the grain tank 7 opens outward. The recess 254 for the reducing agent tank is provided on one of the sides of the grain tank 7 that is closest to the support member.

[0076] The engine 14 is disposed on the front side of the grain tank 7, and a purification device support frame 251 is provided upright from the traveling machine body 1 below a purification device installation recess 7a formed by cutting out the front of the interior side of the grain tank 7, and an exhaust gas purification device 74 is installed on the purification device support frame 251. The reducing agent tank recess 254 is formed by cutting out the rear side of the grain tank 7, and a reducing agent tank 174 is installed at a position outside the traveling machine body relative to the rotation fulcrum. Reducing agent pipes 179, 180 connecting the reducing agent tank 174 and the exhaust gas purification device 74 are disposed along the grain tank 7.

[0077] The reducing agent pipes 179, 180 are led from the reducing agent tank 174 toward the center of the traveling body from the pivot point, passed below the grain tank 7, led to the front of the traveling body 1, and led along the purification device support frame 251 to the exhaust gas purification device 74. A reducing agent water supply device 175 that supplies reducing agent to the exhaust gas purification device 74 is installed midway along the reducing agent pipes 177, 179, 180. The reducing agent water supply device 175 is fixed to a supply device support 185 provided on the purification device support frame 251.

[0078] In the above combine harvester, the grain tank 7 is provided with the reducing agent tank recess 254 in which the reducing agent tank 174 is disposed, so that a space for disposing the reducing agent tank 174 can be secured without increasing the external dimensions of the combine harvester. Furthermore, if the grain tank 7 is configured to be rotatably provided on the outside of the traveling body 1 and the reducing agent tank recess 254 is provided on one of the sides of the grain tank 7 that is closer to the rotation fulcrum of the grain tank 7, it is possible to reduce the deflection of the reducing agent pipes 179, 180 connected to the reducing agent tank 174 when the grain tank 7 rotates.

[0079] If the reducing agent tank recess 254 is provided at a position outside the traveling body 1 relative to the rotation fulcrum, and the reducing agent pipes 179, 180 connected to the reducing agent tank 174 are led from the reducing agent tank 174 to the center side of the traveling body 1 relative to the rotation fulcrum of the grain tank 7, it is possible to prevent the reducing agent pipes 179, 180 from interfering with the rotation of the grain tank 7. Furthermore, if the reducing agent pipes 179, 180 are led to the exhaust gas purification device 74 side through below the grain tank 7, it is possible to prevent the reducing agent pipes 179, 180 from interfering with the rotation of the grain tank 7.

[0080] In addition, with the traveling direction of the traveling body 1 being the front-to-rear direction, if the engine 14 is disposed on the front side of the grain tank 7 and the above-mentioned recess 254 for the reducing agent tank is provided on the rear side of the grain tank 7, it is possible to prevent the reducing agent tank 174 from being affected by heat from the engine 14.

[0081] The configuration of each part in the present invention is not limited to the illustrated embodiment, and various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0082] 1 Running body 7 Grain Tank 8a Vertical take-out conveyor 14 Engine 30 Rear cover 74 Exhaust gas purification device 174 Urea water tank (reducing agent tank) 174a Water inlet 263 Water supply container 280 Supply stand

Claims

1. A combine harvester including an engine as a power source mounted on a traveling body, an exhaust gas purification device that removes nitrogen oxides from exhaust gas from the engine, a reducing agent tank that stores a reducing agent to be supplied to the exhaust gas purification device, and a grain tank that carries harvested grain, A combine harvester characterized in that the reducing agent tank is disposed behind the traveling body and in a position overlapping with the grain tank in a side view.

2. The combine harvester according to claim 1, characterized in that a vertical discharge conveyor for discharging grains to the outside is disposed behind the grain tank, and the reducing agent tank and the vertical discharge conveyor are disposed in a position where they overlap when viewed from the side.

3. 3. The combine harvester according to claim 1, wherein the water supply port of the reducing agent tank is provided toward the rear of the traveling body.

4. 4. The combine harvester according to claim 3, wherein an openable and closable rear cover is provided behind the traveling body of the grain tank, and the reducing agent tank is disposed within the rear cover.

5. 5. The combine harvester according to claim 4, further comprising a supply stand for mounting a urea water supply container on the rear of the reducing agent tank.

6. 6. The combine harvester according to claim 5, wherein the supply table is foldable.

Images