JP2023158135A - Combine harvester - Google Patents

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

The present invention relates to a combine harvester such as a combine harvester that harvests grain culms planted in a field and collects grains, or a feed combine harvester that harvests grain culms for feed and collects them as fodder, and more specifically relates to a combine harvester such as a diesel engine etc. The present invention relates to a combine harvester equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) contained in the exhaust gas, nitrogen oxides (NOx), etc. contained in the exhaust gas.

Traditionally, a case with a diesel particulate filter (hereinafter referred to as a DPF case) and a urea selective reduction catalyst have been installed in the exhaust path of a diesel engine as an exhaust gas purification device (exhaust gas after-treatment device). There is a known technology for purifying exhaust gas emitted from a diesel engine by providing a case (hereinafter referred to as an SCR case) and introducing exhaust gas into the DPF case and the SCR case (for example, Patent Documents 1 to 3). reference). Conventionally, combine harvesters have a structure in which uncut grain culms in the field are cut by a cutting blade device, the cut grain culms are transported to a threshing device by a grain culm conveying device for threshing, and the grains are collected in a grain tank. The engine was mounted on the traveling aircraft, and the DPF case was placed in a horizontal position on the top side of the engine, so that exhaust gas was discharged from the engine toward the DPF case (for example, see Patent Document 4). ).

JP2009-74420A Japanese Patent Application Publication No. 2012-21505 Japanese Patent Application Publication No. 2012-177233 Japanese Patent Application Publication No. 2010-209813

In the conventional technology, in a structure in which the engine and the exhaust gas purification device (DPF case) are installed close to each other in the engine room, it is necessary to secure installation space for the exhaust gas purification device (SCR case) around the engine mounting part. However, there are problems such as limited engine room volume or exhaust gas purification device (DPF case or SCR case) volume. In addition, in a structure in which the exhaust gas purification device (DPF case or SCR case) is supported outside the engine room, the mounting position of the urea mixing pipe that connects the SCR case to the DPF case or the exhaust gas purification device is restricted, and the exhaust gas There are problems such as the inability to simplify the mounting structure of the purifier. In addition, in a structure such as a freight vehicle where the exhaust gas purification device (DPF case or SCR case) is installed in the traveling body of the vehicle at a location far from the engine, it is possible to easily secure the installation space for the exhaust gas purification device, but the exhaust gas There is a problem that the exhaust gas temperature within the purification device tends to drop below a predetermined temperature.

Therefore, the present invention aims to provide a combine harvester that has been improved by considering these current situations.

In order to achieve the above object, a combine harvester according to one embodiment includes a driving part including an engine, a threshing device that performs threshing processing, and a movable part located on the side of the threshing device and rearward of the driving part, A combine harvester comprising: a grain tank for storing grains; and an exhaust gas purification device for treating exhaust gas from the engine; The exhaust gas includes a first case for removing substances, and a second case for removing nitrogen oxide substances contained in the exhaust gas treated 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 to overlap with the grain tank in plan view and front view. A recess is formed on the front left side of the grain tank, facing the grain tank and the engine room, and the second case is placed in the recess.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left side view of a six-row combine harvester showing an embodiment of the present invention. FIG. It is a right side view of the same. FIG. 2 is a front perspective view showing the configuration inside the engine room. FIG. 2 is a perspective view showing the positional relationship between engine peripheral parts, a grain tank, and a threshing machine. FIG. 2 is an external perspective view showing an engine and an exhaust gas purification device. FIG. 3 is a rear perspective view of the exhaust gas purification device mounting section. It is a right view which shows a part of threshing device. It is an explanatory diagram of urea water supply. FIG. 2 is a perspective view showing the arrangement of parts on a traveling machine body in a combine harvester according to a first embodiment. It is a rear perspective view of the same combine. FIG. 3 is a plan view of the combine harvester. FIG. 2 is a plan view of a combine harvester according to a second embodiment. It is a rear perspective view of the same combine. It is a front view of the urea water tank in the combine. It is a right side view of the combine harvester. FIG. 7 is a perspective view showing the arrangement of parts in a combine harvester according to a third embodiment. It is a left side view showing the inside of the threshing device of the same combine. FIG. 7 is a perspective view showing the arrangement of parts on a traveling machine body in a combine harvester according to a fourth embodiment. It is a rear perspective view of the same combine. It is a figure which shows the modification of the urea water tank in the same combine. FIG. 7 is a perspective view showing the arrangement of parts on a traveling machine body in a combine harvester according to a fifth embodiment. It is a front view (left side view of the combine) of the fuel tank and urea water tank of the combine. It is a front view (left side view of a combine) which shows the 1st modification of the fuel tank and urea water tank of the same combine. 25 is a side view showing the configuration of the fuel tank and urea water tank shown in FIG. 24. FIG. FIG. 25 is a side view showing the structure when the fuel tank and urea water tank shown in FIG. 24 are separated. It is a front view (left side view of a combine) which shows the 2nd modification of the fuel tank and urea water tank of the same combine. 28 is a side view showing the configuration of the fuel tank and urea water tank shown in FIG. 27. FIG. FIG. 28 is a front view showing a state in which the urea water tank shown in FIG. 27 is filled with urea water.

<First embodiment>
A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 12. The overall structure of an embodiment of a combine harvester equipped with a diesel engine will be described with reference to FIGS. 1 to 3. In addition, in the following description, the left side when facing the forward direction of the traveling body 1 is simply called the left side, and the right side when facing the forward direction is also simply called the right side. As shown in FIGS. 1 to 3, the vehicle includes a traveling body 1 supported by a pair of left and right traveling crawlers 2 as traveling sections. A reaping device 3 for six-row reaping, which takes in grain culms while reaping them, is mounted on the front part of the traveling machine 1 so that it can be raised and lowered around a reaping rotation fulcrum shaft 4a by a single-acting lifting hydraulic cylinder 4. Ru. A threshing device 5 having a feed chain 6 and a grain tank (grain tank) 7 for storing grain taken out from the threshing device 5 are mounted on the traveling machine 1 side by side. Note that the threshing device 5 is disposed on the left side of the traveling body 1, and the grain tank 7 is disposed on the right side of the traveling body 1.

Further, a rotatable grain discharge conveyor 8 is provided at the rear of the traveling body 1 via a vertical take-out conveyor 8a, and the grains inside the grain tank 7 are transported from the paddy dumping port 9 of the grain discharge conveyor 8 to the loading platform of a truck or the like. It is configured so that it is discharged into a container, etc. An operating cabin 10 is provided on the right side of the reaping device 3 and on the front side of the grain tank 7. A cabin rotation fulcrum shaft 10a is provided at the front lower part of the driving cabin 10, and the front lower part of the driving cabin 10 is rotatably supported on the traveling aircraft 1 via the cabin rotation fulcrum shaft 10a, and is directed toward the front side outside the aircraft. The driving cabin 10 is movably installed, and the driving cabin 10 is configured to be rotated forward about a cabin rotation fulcrum shaft 10a.

Inside the driving cabin 10, there are a control handle 11, a driver's seat 12, a main shift lever 15, a sub-shift lever 16, a threshing clutch lever 17 for operating a threshing clutch on and off, and a reaping clutch lever for operating a reaping clutch on and off. 18 are arranged. A diesel engine 14 as a power source is arranged in the traveling body 1 below the driver's seat 12. The operating cabin 10 is provided with a step on which an operator rides, a handle column provided with a control handle 11, a lever column provided with each of the levers 15, 16, 17, and 18, and the like.

As shown in FIG. 1, left and right track frames 21 are arranged on the lower surface side of the traveling body 1. The track frame 21 includes a driving 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, and a plurality of track rollers that maintain the ground side of the traveling crawler 2 in a grounded state. 24, and an intermediate roller 25 that holds the non-ground side of the traveling crawler 2. The driving 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 roller 24 supports the ground side of the traveling crawler 2, and the intermediate roller 25 supports the traveling crawler 2. Support the ground side.

As shown in FIGS. 1 and 2, a fuel tank 31 for storing fuel to be supplied to the engine 14 is arranged at the rear left side of the traveling body 1, and diesel fuel is poured into the fuel tank 31 from outside the machine on the left side of the threshing device 5. It is configured to be replenishable. That is, the fuel tank 31 is installed on the traveling machine body 1 at a position below the straw cutter 65 at the rear of the threshing device 5, and the fuel filler port 32 (see FIG. 8) is installed on the left side of the threshing device 5. This allows refueling from the outside of the aircraft.

As shown in FIGS. 1 and 2, a reaping frame 51 connected to the reaping rotation fulcrum shaft 4a of the reaping device 3 has a clipper-type cutting blade device 52 for cutting the base of uncut grain culms planted in the field. is provided. In front of the reaping frame 51, a six-row grain culm lifting device 53 for raising uncut grain culms planted in the field is arranged. A grain culm conveying device 54 that conveys the reaped grain culms cut by the cutting blade device 52 is arranged between the grain culm pulling device 53 and the front end (feed starting end side) of the feed chain 6 . In addition, a six-row weeding body 55 for weeding uncut grain culms is protruded from the lower front part of the grain culm pulling device 53. It is configured to continuously reap uncut grain stalks planted in the field by the reaping device 3 while moving within the field.

Next, the structure of the threshing device 5 will be explained with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the threshing device 5 includes a handling drum 56 for threshing grain culms, a swing sorting board 57 and a winnowing fan 58 for sorting the threshed material falling below the handling drum 56, and a handling drum 56 for threshing grain culms. A processing cylinder 59 for reprocessing the threshing waste taken out from the rear of the cylinder 56 and a dust exhaust fan 60 for discharging dust from the rear of the swing sorting board 57 are provided. The grain culms transported from the reaping device 3 by the grain culm transport device 54 are transferred to the feed chain 6, carried into the threshing device 5, and threshed by the handling drum 56.

As shown in FIG. 1, on the lower side of the swinging sorting board 57, there is a first conveyor 61 for taking out the grains (first grain) sorted by the swinging sorting board 57, and a second conveyor 61 for taking out the grains (first grain) sorted by the swinging sorting board 57, and a second conveyor 61 for taking out the grains (first grain) sorted by the swinging sorting board 57. A second conveyor 62 for taking out the products is provided. The oscillating sorting board 57 is configured so that the threshed grains leaking from the receiving net 67 stretched below the handling cylinder 56 are oscillatingly sorted (specific gravity sorted) by a feed pan 68 and a chaff sieve 69. . The grains falling from the oscillating sorting board 57 have dust in them removed by the sorting air from the winnowing fan 58, and fall first onto the conveyor 61. The grains first taken out from the conveyor 61 are carried into the grain tank 7 via the grain frying conveyor 63 and collected in the grain tank 7.

Further, as shown in FIG. 1, the swinging sorting board 57 is configured to drop second products such as grains with stems from the chaff sieve 69 onto the second conveyor 62 by swinging sorting. A sorting fan 71 is provided for sorting the second items falling below the chaff sieve 69. Dust and straw in the grains of the second grains that have fallen from the chaff sieve 69 are removed by the sorting air from the sorting fan 71, and the grains 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 material to the upper surface of the swing sorting board 67 for re-sorting. There is.

On the other hand, as shown in FIGS. 1 and 2, a straw removal chain 64 and a straw removal cutter 65 are arranged at the rear end side (feed end side) of the feed chain 6. The waste straw (the culm from which the grains have been threshed) transferred from the rear end side of the feed chain 6 to the straw removal chain 64 is discharged in a long state to the rear of the traveling machine 1 or to the rear of the threshing device 5. After the straw is cut into appropriate lengths by a straw removal cutter 65 provided at the top, the straw is discharged to the rear and lower part of the traveling machine body 1.

As shown in FIGS. 4 and 5, the grain tank 7 has a recess 7a for installing a purifier having a cutout shape on the left side of the front surface, a recess 7b for installing a grain discharge conveyor in the shape of a groove in the front and back direction on the left side of the upper surface, and a recess 7b for installing a grain discharge conveyor in the left side of the upper surface. A recess 7c for installing a grain frying conveyor is provided in the center with a step in the vertical direction. In the purification device installation recess 7a on the front surface of the grain tank 7, a space is provided behind the engine room 97, in which the exhaust gas purification device 74 is arranged. In the grain discharge conveyor installation recess 7b on the upper surface of the grain tank 7, a grain discharge conveyor 8 whose tip is accommodated in a conveyor support is accommodated along the grain discharge conveyor installation recess 7b. Furthermore, a grain frying conveyor 63 is fixed to the grain frying conveyor installation recess 7c on the left side of the grain tank 7 along the grain frying conveyor installation recess 7c, and a receiving port provided at the upper part of the grain frying conveyor installation recess 7c. are connected.

As shown in FIGS. 3, 10, and 11, the grain discharge conveyor 8 is rotatably supported on the upper end side of a vertical take-out conveyor (vertical feed conveyor) 8a, and the grain discharge conveyor 8 is rotatably supported on the upper end side of the grain discharge conveyor 8. A paddy throwing port 9 is provided at the top. A cross-feeding conveyor 8b is disposed at the bottom of the grain tank 7 in a longitudinal direction, and the lower end (base end) side of a vertical take-out conveyor 8a is connected to the rear end of the cross-feeding conveyor 8b. Additionally, an outside bottom plate 7a and an inside bottom plate (not shown) are provided at the bottom of the grain tank 7, and the outside bottom plate 7a and the inside bottom plate are inclined toward the traverse conveyor 8b, so that the grain inside the grain tank 7 can be moved horizontally. It is made to flow down in the direction of the feed conveyor 8b. The horizontal feed conveyor 8b extends along the front and back of the bottom of the grain tank 7, and conveys the grains flowing down along the bottom plate of the grain tank 7 to the rear vertical take-out conveyor 8a.

The vertical take-out conveyor 8a is connected to the rear end of the transverse feed conveyor 8b that projects from the rear end surface of the grain tank 7, and extends upward from the grain tank 7 along the rear end surface of the grain tank 7. The vertical take-out conveyor 8a is erected at the rear of the grain tank 7 by having its lower end (base end) connected to the transverse conveyor 8b and its upper part fixed to the rear end surface of the grain tank 7. Further, the lower end of the vertical take-out conveyor 8a is supported on the traveling machine body 1, so that the grain tank 7 can be moved laterally toward the outside of the machine around the axis of the vertical take-out conveyor 8a, and the right side of the threshing device 5 and the rear side of the engine room 97 are supported. is configured to be openable. Further, 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 outboard bottom plate 7a of the grain tank 7.

Next, with reference to FIGS. 4 to 7, the first case 75 (diesel particulate filter, DPF) and second case 229 (selective catalytic reduction, SCR) as the exhaust gas purification device 74, and the diesel engine 14. I will explain about it. A first case 75 as a diesel particulate filter (DPF) that removes particulate matter in the exhaust gas of the diesel engine 14, and a urea selective catalytic reduction (SCR) that removes nitrogen oxide substances in the exhaust gas of the diesel engine 1. A second case 229 as a system is provided. As shown in FIG. 5, the first case 75 includes an oxidation catalyst 79 and a soot filter 80. As shown in FIG. 7, the second case 229 includes an SCR catalyst 232 for selective catalytic reduction of urea and an oxidation catalyst 233.

Further, the first case 75 has an inlet side case 76 and an outlet side case 77. A diesel oxidation catalyst 79 made of platinum or the like that generates nitrogen dioxide (NO2) is disposed inside the inlet side case 76. A soot filter 80 having a honeycomb structure that continuously oxidizes and removes collected particulate matter (PM) at a relatively low temperature is disposed inside the inlet side case 76 and the outlet side case 77. In addition to removing particulate matter (PM) from the exhaust gas of the diesel engine 14, the diesel oxidation catalyst 79 and the soot filter 80, which are arranged in series in the exhaust gas movement direction within the inlet side case 76 and the outlet side case 77, Reduces carbon monoxide (CO) and hydrocarbons (HC) in exhaust gas. On the other hand, an SCR catalyst 232 and an oxidation catalyst 233 are arranged in series in the movement direction of exhaust gas within the second case 229. The SCR catalyst 232 and the oxidation catalyst 233 in the second case 229 are configured to reduce nitrogen oxide substances (NOx).

Further, as shown in FIGS. 4 to 7, the first case 75 and the second case 229 are formed into an elongated cylindrical shape that extends in the longitudinal direction of the fuselage. A purification inlet pipe 81 for introducing exhaust gas and a purification outlet pipe 82 for discharging 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 for introducing exhaust gas and an SCR outlet pipe 237 for discharging 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).

Further, as shown in FIGS. 4 to 7, a supercharger 118 for forcibly feeding air into the diesel engine 14 is disposed at the exhaust gas outlet (exhaust manifold 117) of the diesel engine 14. The purification inlet pipe 81 is communicated with the exhaust gas outlet side of the supercharger 118 via the exhaust connecting pipe 119, and the exhaust gas of the diesel engine 14 is introduced into the first case 75. A urea mixing pipe 239 that connects the SCR inlet pipe 236 is connected to the purification outlet pipe 82, and exhaust gas is introduced into the second case 229 from the first case 75 through the urea mixing pipe 239. In addition, the exhaust gas outlet side of the supercharger 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 supercharger 118 side are transferred to the exhaust connecting pipe 119 side. It is configured so that it is not transmitted to

On the other hand, the purification outlet pipe 82 and the urea water injection part 240 of the urea mixing pipe 239 are removably bolted together via a pipe flange. The inlet side case 76 and the outlet side case 77 are removably connected by bolting 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. It consists of In addition, the tail pipe 83 is connected to the SCR outlet pipe 237, and the exhaust gas outlet of the tail pipe 83 is opened toward the upper side of the fuselage, and the exhaust gas of the diesel engine 14 (each cylinder) is 118 into the first case 75, moves from the first case 75 to the urea mixing pipe 239, and mixes the urea water in the urea water tank 174 (described later) with the exhaust gas, and then the exhaust gas is introduced into the second case. 229 and discharged from the tail pipe 83 to the outside of the aircraft.

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

Next, as shown in FIGS. 4 and 6, an engine room frame 91 as a body frame is erected on the traveling body 1 in front of the grain tank 7, and the engine room frame 91 forms an engine room 97. A diesel engine 14 is mounted on the upper surface side of the traveling body 1, and is installed inside the engine room 97. Further, cooling parts such as a water cooling radiator (not shown) and a cooling fan 115 are installed inside the engine room 97 on the side of the diesel engine 14 . The cooling fan 115 is configured to take in outside air from the right side of the combine body toward cooling parts such as a radiator (not shown), while exhausting warm air from the diesel engine 14 toward the threshing device 5 side. There is.

Further, the right side, rear side, and upper side of the diesel engine 14 and the cooling parts are surrounded by the engine room frame 91, and the cooling fan 115 of the diesel engine 14 cools the inside of the engine room 97 from the right side outside of the engine room frame 91. While taking in outside air for use, warm air after cooling the diesel engine 14 and cooling components is discharged toward the right side of the threshing device 5, which is a working section adjacent to the engine room frame 91 (engine room 97). are doing.

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

In addition, rubber pressure contact legs (not shown) provided at the rear of the bottom of the operating cabin 10 are brought into contact with the upper surfaces of the left and right cradle 96 of the horizontal frame 94 from above, so that each cradle 96 of the lateral frame 94 The rear part of the driving cabin 10 is supported so as to be movable in the vertical direction. A diesel engine 14 is installed inside an engine room 97 formed by the bottom side of the driving cabin 10 and an engine room frame 91. As shown in FIG. 4, a conveyor support 90 is provided on the upper end side of the left support 92, and the grain discharge conveyor 8 is supported at the storage position via the conveyor support 90.

Furthermore, an air cleaner 123 that supplies outside air to the diesel engine 14 and a pre-cleaner 124 that takes outside air into the air cleaner 123 are provided. An air cleaner 123 is disposed on the right side of the exhaust gas purification device 74 on the upper surface of the engine room 97, and a pre-cleaner 124 is disposed on the front right side of the grain tank 7 and above the engine room 94. An air cleaner 123 is connected via the air cleaner 123. It is configured to take combustion air from the pre-cleaner 124 through the air cleaner 123 into the compressor case 118a of the supercharger 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, so that the air cleaner 123 is located on the front right side of the exhaust gas purification device 74.

As shown in FIGS. 4 to 6, the supercharger 118 is installed at the upper front side of the diesel engine 14, and has a compressor case 118a with a built-in blower wheel on the right side, and a turbine case with a built-in turbine wheel on the left side. A case 118b is provided. The intake side provided at the right end of the compressor 118a communicates with the intake exhaust side of the air cleaner 123 via the air supply pipe 120. On the other hand, an exhaust outlet pipe 99 installed at the left end of the turbine case 118b is connected to an exhaust gas inlet (purification inlet pipe 81) of an exhaust gas purification device 74, which is an after-treatment device, through a bendable bellows-shaped exhaust introduction pipe 98. The exhaust connecting pipe 119 is connected to the exhaust connecting pipe 119.

As shown in FIGS. 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 distributed to the left and right with respect to the engine 14 on the back side of the engine room frame 91. It is arranged as follows. That is, with respect to the supercharger 118 in the front of the engine 14, the air cleaner 123 and pre-cleaner 124, which serve as an intake system, are arranged on the right side of the compressor case 118a, while the exhaust gas purification, which serves as an exhaust system, is placed on the left side of the turbine case 119b. A device 74 is arranged. Therefore, since the intake path and the exhaust path of the engine 14 including the supercharger 118 are distributed to the left and right, the intake path and the exhaust path can be configured as short paths, and the exhaust path through which high-temperature exhaust gas passes can be arranged. The intake paths can be spaced apart.

Next, the mounting structure and support structure of the exhaust gas purification device 74 will be described with reference to FIGS. 4 to 7. The exhaust gas purification device 74 has a unit configuration in which a first case (DPF) 75 and a second case (SCR) 229 are connected in parallel by a case fixing member 231. On the case fixing body 231, the first case 75 is removably fixed with a plurality of fastening bands 85, and the second case 229 is removably fixed with a plurality of fastening bands 230. That is, by bolting both ends of each of the plurality of fastening bands 85 and 230 to the case fixed body 231, the first case 75 and the second case 229 are arranged parallel to each other on the case fixed body 231.

The exhaust gas purification device 74 is supported on the traveling body 1 by fixing the case fixing body 231 on which the first case 75 and the second case 229 are mounted to the support stand 250. As shown in FIGS. 4 to 7, the support stand 250 is disposed below the purification device installation recess 7a provided on the front left side of the grain tank 7 (on the side of the threshing device 5). It is supported from the room 97 to the purification device installation recess 7a. As shown in FIGS. 5 to 7, the support stand 250 has its left edge fixed to the right side of the machine casing frame of the thresher 5, its front side fixed to the engine room frame 94, and its right edge erected from the traveling machine body 1. The grain tank 7 is supported at an upper position in the recess 7a of the grain tank 7 by being fixed by a support pillar frame 251.

As shown in FIGS. 4 and 6, the front side of the support stand 250 is connected to the engine room frame by connecting the other end of the bridge frame 252, which has one end fixed to the back surface of the support stand 250, to the horizontal frame 94 of the engine room frame 91. Supported by 91. In addition, as shown in FIG. 5, the left edge of the support stand 250 is connected to the right side of the upper surface of the threshing device 5 (threshing upper surface frame at the upper right side of the threshing machine casing) via the assembly adjustment frame 253. It is supported on the right side of 5. Further, the right edge of the support stand 250 is supported on the support frame 251 by being connected to the upper end of the support frame 251 via the horizontal frame 254, as shown in FIG.

As shown in FIGS. 4 and 5, the bridge 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 disposed 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 bridge frame 252 is placed between the intake path including the air cleaner 123 and the exhaust path connected to the first case 75, the influence of exhaust heat from the exhaust path on the air cleaner 123 is reduced. can.

As shown in FIGS. 4 to 7, the grain tank 7 has a recess 7a for installing a purifier on the surface facing the engine room 97, and a first case 75 and a second case are provided in the recess 7a of the grain tank 7. An exhaust gas purification device 74 based on 229 is installed. As a result, although the exhaust gas purification device 74 can be placed close to the engine 14 between the grain tank 7 and the engine room 97, it is possible to prevent workers from coming into contact with the exhaust gas purification device 74, which becomes hot. . Moreover, 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 is placed in a high temperature environment necessary for purifying the exhaust gas, and the exhaust gas purification device 74 has a high temperature. The purifying effect can be maintained.

At this time, as shown in FIGS. 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 229 are arranged in parallel. By horizontally supporting the first case 75 and the second case 229, the exhaust gas purification device 74 can be arranged compactly at a higher position than the engine 14, and the high temperature exhaust gas from the engine 14 can be transferred to the exhaust gas purification device 74. The structure can be easily guided. Further, by arranging the exhaust gas purification device 74 at a high position, it is possible to prevent water generated by condensation due to a temperature drop when the engine 14 is stopped from accumulating in the exhaust gas purification device 74.

As shown in FIGS. 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 member 231, and a urea mixing pipe is connected to the exhaust outlet of the first case 75. The exhaust inlet of the second case 229 is connected through a pipe 239, and a urea mixing pipe 239 is arranged between the first and second cases 75, 229 in parallel with the first and second cases 75, 229, respectively. Thereby, the first case, the second case, and the urea mixing pipe are configured into an integral unit structure, and the exhaust gas purification device 74 can be installed compactly inside the recess 7a in front of the grain tank 7. Therefore, while the installation space for the exhaust gas purification device 74 can be easily secured, the recess 7a of the grain tank 7 can be configured to be narrow, and the grain storage capacity of the grain tank 7 can be secured.

The first and second cases 75, 229 of the exhaust gas purification device 74 are arranged side by side on the left and right, with the respective longitudinal directions of the first and second cases 75, 229 being the front and rear directions, and the first case 75 is connected to the threshing device 5. It is placed on the side. The first case 75 is placed on the side of the threshing device 5, while the second case 229 is placed on the back side of the recess 7a of the grain tank 7, so that the second case 229 and the urea mixing pipe 239 are covered with the grain tank 7. At the same time, the first case 75 can be placed near the exhaust port of the engine 14. Therefore, the exhaust path from the engine 14 to the first case 75 can be configured as a short path, and the regeneration process in the first case 75 can be maintained at high performance. In addition, the second case 229 and the urea mixing pipe 239 can be placed in a high-temperature environment surrounded by the grain tank 7 behind the engine room 97, which prevents the urea water from freezing and at the same time increases the purification ability of the second case 229. Can be maintained.

As shown in FIGS. 7 to 12, a urea water tank 174 that stores urea water (urea aqueous solution for selective catalyst reduction) and a urea water supply device 175 that supplies urea water to the urea water injection part 240 of the urea mixing pipe 239 are installed. We are prepared. The urea water supply device 175 supplies the urea water in the urea water tank 174 to the urea water injection unit 240 of the urea mixing pipe 239, so that the urea water is injected from the urea water injection valve 178 of the urea water injection unit 240 into the urea mixing pipe 239. Spray inside.

As shown in FIG. 9, the urea water supply device 175 includes a urea water pump 171 that pumps the urea aqueous 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 the urea water injection valve 178 of the urea injection unit 240 via the urea water injection pipe 177, and also has a urea water supply pipe 179 and a urea water return pipe 180 between it and the urea water tank 174. Connected. It also includes an engine controller 181 that executes fuel injection control of the diesel engine 14 and the like, and a urea injection controller 182 that controls the urea water supply device 175 or the urea water injection valve 178.

Then, the urea water injection valve 178 is attached to the urea injection part 240 of the urea mixing pipe 239, and the 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 tube 239 is configured to be mixed as ammonia into the exhaust gas flowing from the first case 75 to the second case 229. Note that the urea water temperature sensor 183 of the urea water tank 174 and the urea water amount sensor 184 of the urea water tank 174 are connected to the urea injection controller 182, and the engine controller 181 and the urea injection controller 182 are connected. The configuration is such that urea water is supplied into the urea mixing tube 239 at an appropriate time depending on the operating conditions.

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

As shown in FIGS. 10 and 12, an exhaust gas purification device 74 is installed between the threshing device 5 and the grain tank 7 at the rear of the engine room 97, and a urea water supply device supplies urea water to the exhaust gas purification device 74. 175 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 room 97, it is possible to prevent the urea water from freezing using the exhaust heat from the engine 14, and it is possible to suppress the quality deterioration of the urea water.

Further, as shown in FIGS. 10 and 12, the exhaust gas purification device 74 is arranged at a position sandwiched between the engine room 97 and the grain tank 7 in the front and back, and the exhaust gas purification device 74 is arranged at a position sandwiched between the grain tank 7 and the threshing device 5. A urea water supply device 175 is disposed at. By effectively utilizing the space around the grain tank 7 and arranging the exhaust gas purification device 74 and the urea water supply device 175, the capacity of the grain tank 7 can be secured. Furthermore, since the exhaust gas purification device 74 and the urea water supply device 175 can be arranged 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 shortened. Can be configured.

As shown in FIGS. 7 and 8, a urea water supply device 175 is fixed on the right side (grain tank 7 side) of the threshing device 5 in an area sandwiched between the grain frying conveyor 63 and the reduction conveyor 66. . As a result, the urea water supply device 175 can be placed near the exhaust gas purification device 74 located in front of the grain tank 7 adjacent to the threshing device 5, so the urea water piping connects the urea water tank 174 to the urea water injection unit 240. (Urea water injection pipe 177) can be configured to be short. Further, the exhaust gas purification device 74 and the urea water supply device 175 can be arranged in the exhaust air flow path configured between the threshing device 5 and the grain tank 7 at the rear of the engine room 97. Therefore, the SCR system can be operated in an optimal temperature environment, such as by preventing urea water from freezing.

In this embodiment, as shown in FIGS. 7 and 8, the urea water supply device 175 is fixed at a position in front of the grain frying conveyor 63 and below the return conveyor 66. That is, the urea water supply device 175 is fixed to the right side of the threshing device 5 and is located 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 arranged at a position surrounded by the grain frying conveyor 63 and the return conveyor 66, which intersect with each other, and the cover body 58a that covers the right side suction port of the winnowing fan 58.

On the other hand, the grain tank 7 is installed without interference from the grain frying conveyor 63 and the return conveyor 66. Therefore, by arranging the urea water supply device 175 in the area surrounded by the grain frying conveyor 63 and the reduction conveyor 66, the urea water supply device 175 can be fixed to the side of the threshing device 5 without buffering the grain tank 7, and the grain tank 7 There is no need to change the shape of the grain tank 7, and the capacity of the grain tank 7 can be secured.

Next, with reference to FIG. 8, a modification of the installation position of the urea water supply device 175 disposed in the area sandwiched between the grain frying conveyor 63 and the return conveyor 66 will be described. As shown in FIG. 8, the urea water supply device 175 may be installed at a position in front of the grain frying conveyor 63 and below the return conveyor 66, and as shown in the imaginary line, the urea water supply device 175 By arranging them at the same height position, they are arranged at a height position below the exhaust gas purification device 74.

Further, as shown by the imaginary line in FIG. 8, the urea water supply device 175 may be installed behind the grain frying conveyor 63 and either above or below the return conveyor 66. Furthermore, on the right side of the threshing device 5, when the grain frying conveyor 63 and the return conveyor 66 are arranged side by side without crossing each other, the urea water supply device 175 is installed between the grain fryer conveyor 63 and the return conveyor 66. It may also be installed.

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

As shown in FIGS. 10 to 12, the urea water tank 174 is arranged vertically with its longitudinal direction being the vertical direction, and is fixed to the lower right edge (outside edge of the machine) of the rear end surface of the grain tank 7. Ru. Since the water supply port 174a protrudes toward the right side opposite to the fuel supply port 32 facing the left side of the traveling body 1, when refueling the fuel tank 31 or watering the urea water tank 174, In addition, misjudgment between the fuel filler port 32 and the water filler port 174a can be prevented. Furthermore, since the water supply port 174a projects 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, and refueling and water supply operations can be performed at the same time.

As shown in FIGS. 10 and 11, a urea water tank 174 is vertically arranged around the vertical take-out conveyor (vertical feed conveyor) 8a behind the grain tank 7. The urea water tank 174 is arranged inside the rear cover 30, and is arranged in parallel with the vertical take-out conveyor 8a. As shown in FIGS. 10 and 12, the urea water tank 174 is connected to the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180, which are piped between the threshing device 5 and the grain tank 7. The urea water supply device 175 is connected to the left side of the urea water supply device 175. That is, the space around the grain tank 7 can be utilized to arrange the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank, so that the capacity of the grain tank 7 can be secured.

As shown in FIGS. 10 and 12, the exhaust gas purification device 74 is placed around the front of the grain tank 7, the urea water supply device 175 is placed on the side of the grain tank 7, and the urea water tank 174 is placed around the front of the grain tank 7. It is placed at the rear. That is, since the urea water supply device 175 is disposed between the exhaust gas purification device 74 and the urea water tank 174, the urea water piping 177, 179, 180 from the urea water tank 174 to the exhaust gas purification device 74 can be configured to be short. .

As shown in FIG. 12, the rear portion of the grain tank 7 is supported on the vertical take-out conveyor 8a, and is configured to be able to move laterally toward the outside of the machine around the axis of the vertical take-out conveyor 8a. By rotating the grain tank 7 vertically around the vertical rotation axis of the vertical take-out conveyor 8a toward the outside of the machine, the right side surface of the threshing device 5 and the rear surface of the engine room 97 can be opened. Since the urea water tank 174 is installed around the vertical take-out conveyor 8a, the connection portion with the urea water supply pipe 179 and the urea water return pipe 180 can be placed near the pivot point of the grain tank 7. Then, the urea water supply pipe 179 and the urea water return pipe 180 are routed from the left side of the grain tank 7 to the back side. Therefore, when the grain tank 7 is opened compared to when the grain tank 7 is stored, the piping distance from the urea water tank 174 to the urea water supply device 175 is shorter, and the difference in piping distance can be reduced by opening and closing the grain tank 7.

Furthermore, when the grain tank 7 is opened by horizontal movement, it is possible to easily access the exhaust gas purification device 74 and the urea water supply device 175 at the rear of the engine room 97, while when the grain tank 7 is stowed, the exhaust gas The purification device 74 and the urea water supply device 175 become inaccessible. Therefore, when the grain tank 7 is stored, it is impossible to come into contact with the exhaust gas purification device 74, etc., which becomes hot during operation. can be opened to easily access the exhaust gas purification device 74 and the urea water supply device 175.

<Second embodiment>
Next, a second embodiment embodying the present invention will be described based on FIGS. 13 to 16. Note that, in the combine harvester of this embodiment, unlike the first embodiment, the urea water tank 174 at the rear of the grain tank 7 is disposed horizontally below the grain tank 7. Since the other configurations are the same as those of the combine harvester in the first embodiment, a detailed explanation thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

As shown in FIG. 13, in the combine harvester of this embodiment, an exhaust gas purification device 74 is arranged around the front of the grain tank 7, a urea water supply device 175 is arranged on the side of the grain tank 7, and the urea water tank 174 is arranged around the front of the grain tank 7. It is located behind grain tank 7. Further, by distributing the fuel tank 31 and the urea water tank 174 to the left and right at the rear of the traveling aircraft 2, the fuel and urea water supply ports 32 and 174a are easily identified.

As shown in FIGS. 13 to 15, the urea water tank 174 is fixed to the bottom plate of the grain tank 7 in a horizontal position, with its rear end projecting further rearward than the grain tank 7. That is, the rear end portion of the urea water tank 174 is arranged near the connecting portion between the vertical take-out conveyor 8a and the horizontal feed conveyor 87b. The rear end portion of the urea water tank 174 is placed 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. The urea water supply device 175 is connected to the urea water supply device 175.

As shown in FIGS. 14 and 15, a tank support 173 is provided on the outside surface of the outside bottom plate 7a of the grain tank 7, and a urea water tank 174 is installed on the outside surface of the outside bottom plate 7a of the grain tank 7 via the tank support 173. Support. A bottom cover body 165 is removably provided on the outer surface of the outside bottom plate 7a of the grain tank 7, and a urea water tank 174 is arranged on the inside of the bottom cover body 165. A water supply port 174a is arranged on the right side surface of the urea water tank 174, facing toward the right side (outward side of the machine). At this time, by providing an opening in the rear cover 30 and protruding the water supply port 174a of the urea water tank 174 toward the outside of the machine, water can be easily supplied from outside the machine.

As shown in FIG. 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 arranged near the pivot point of the grain tank 7. The rear end portion of the urea water tank 174 is arranged 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. The urea water supply device 175 is connected to the urea water supply device 175. Therefore, when the grain tank 7 is opened compared to when the grain tank 7 is stored, the piping distance from the urea water tank 174 to the urea water supply device 175 is shorter, and the difference in piping distance can be reduced by opening and closing the grain tank 7.

As shown in FIG. 16, the urea water supply device 175 is disposed at a height position between the threshing device 5 and the grain tank 7 and below the exhaust gas purification device 74. Further, the urea water supply device 175 is arranged at a higher position than the urea water tank 174 and offset in the front-rear direction (or left-right direction). That is, the urea water supply device 175 is fixed at a position higher than the urea water tank 174 and lower than the urea water injection valve 178.

By arranging the urea water injection valve 178 at a higher position than the urea water supply device 175, the remaining urea water can be removed due to the height difference between the urea water supply device 175 and the urea water injection valve 178 after the injection of urea water is stopped. , and can be refluxed to the urea water supply device 175. 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 has stopped, residual urea water can be removed due to the height difference between the urea water tank 174 and the urea water supply device 175. can be returned to the urea water tank 174. Therefore, as shown in FIG. 16, by arranging the urea water supply device 175 at a height position between the exhaust gas purification device 74 and the urea water tank 174, the urea water supply device 175 circulates the water after the engine is stopped. The urea water can be returned to the urea water tank 174 without having to do so, and the urea water return pipe 180 can be omitted.

<Third embodiment>
Next, a third embodiment embodying the present invention will be described based on FIGS. 17 and 18. Note that the combine harvester in this embodiment differs from the first and second embodiments in that a urea water tank 174 is disposed in the space below the threshing device 5. The other configurations are the same as those of the combine harvesters in the first and second embodiments, so a detailed explanation thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

As shown in FIGS. 17 and 18, a urea water tank 174 is disposed at the bottom of the machine frame 36 that constitutes the frame of the threshing device 5. Utilizing the space at the bottom of the thresher frame 36, the urea water tank 174 can be installed compactly, and the urea water tank 174 can be formed with a large capacity for maintenance work around the grain tank 7 or around the engine 14. , the urea water tank 174 can be configured to be replenishable with urea water.

As shown in FIGS. 17 and 18, the urea water supply device 175 is arranged on the right side of the threshing device 5 (grain tank 7 side), and the piping route 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. Therefore, the piping route from the exhaust gas purification device 74 to the urea water tank 174 can be shortened, and the pressure feeding of urea water through each piping 177, 179, 180 can be facilitated. Quality deterioration can be suppressed. Since the exhaust gas purification device 74 is arranged between the threshing device 5 and the grain tank 7, the space around the threshing device 5 can be utilized to clean the exhaust gas purification device 74, urea water supply device 175, and urea water. The tank 174 can be arranged compactly, and the maintainability and assemblability of the SCR system can be improved.

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

As shown in FIGS. 17 and 18, in this embodiment, a urea water tank 174 is arranged on the lower surface side of the trough 37 in the lower part of the threshing machine frame 36. That is, by installing the urea water tank 174 at a position between the Karachi fan 58 and the No. 1 conveyor 61, the urea water tank 174 is placed below the urea water supply device 175 and at a position offset in the left-right direction. Can be placed.

As shown in FIGS. 17 and 18, the urea water supply pipe 179 and the urea water return pipe 180 connected to the urea water tank 174 run vertically along the right side of the threshing device 5 and horizontally along the lower side of the threshing machine frame 36. This allows for short piping. Furthermore, the urea water tank 174 can be placed near the winnowing fan 56 that guides exhaust heat from the engine 14, and by utilizing the exhaust heat from the engine 14, freezing and recrystallization of urea water can be prevented.

Next, a modification of the installation position of the urea water tank 174 arranged below the threshing machine frame 36 will be described with reference to FIG. 18. As shown by the imaginary line in FIG. 18, the urea water tank 174 may be installed on the lower side of the first gutter 38 or the second gutter 39. That is, the urea water tank 174 may be placed at a position between the first conveyor 61 and the sorting fan 71, or the urea water tank 174 may be placed at a position behind the second conveyor 62. Thereby, the urea water tank 174 can be installed compactly by utilizing the space below the threshing machine frame 36.

<Fourth embodiment>
Next, a fourth embodiment embodying the present invention will be described based on FIGS. 19 to 21. Note that the combine harvester in this embodiment differs from the third embodiment in that a urea water tank 174 is disposed in the side space of the threshing device 5. Since the other configurations are the same as those of the combine harvester in the third embodiment, a detailed explanation thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

As shown in FIGS. 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. Utilizing the space inside the side cover 51, the urea water tank 174 can be installed compactly. The water supply pipe 179 and the urea water return pipe 180) can be configured to be short.

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

The urea water tank 174 is provided on the left side of the fuel tank 31 in the front-rear direction, and has a shape in which its rear portion projects upward. The urea water tank 174 has a water supply port 174a protruding toward the outside of the machine (toward the left side) at an upwardly projecting portion at the rear. By configuring the urea water tank 174 in this way, the urea water tank 174 can be installed compactly by utilizing the installation space of the fuel tank 31. ) 174a can be placed close to each other, improving replenishment workability.

Further, in this embodiment, the urea water tank 174 may be configured integrally with the side cover, as in a modification shown in FIG. 21. In the modification shown in FIG. 21, the urea water tank 174 is provided with a tank part 174c for storing urea water on the back side (fuel tank 31 side) of a side cover part 174b that covers the entire left side surface of the fuel tank 31, and a side cover part 174c for storing urea water. A water supply port 174a communicating with the tank portion 174c is provided on the front side of the portion 174b. Further, an opening 174d is provided in a region 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 through the opening 174d.

At this time, the urea water tank 174 integrated with the side cover can be made removable by making the connecting parts between the tank part 174c and the urea water supply pipe 179 and the urea water return pipe 180 removable using a quick coupler or the like. . As a result, by removing the urea water tank 174, work such as maintenance and cleaning around the fuel tank 31 is facilitated, and by removing and storing the urea water tank 174, the urea water can be stored in an optimal temperature environment. Can be managed.

<Fifth embodiment>
Next, a fifth embodiment embodying the present invention will be described based on FIGS. 22 to 29. Note that, in the combine harvester of this embodiment, unlike the third embodiment, the urea water tank 174 located behind the grain tank 7 is arranged to overlap the fuel tank 31. Since the other configurations are the same as those of the combine harvester in the third embodiment, a detailed explanation thereof will be omitted, and the configuration related to the urea water tank 174 will be described below.

As shown in FIGS. 22 and 23, the urea water tank 174 and the fuel tank 31 are arranged below the threshing device 5, and the water supply port 174a of the urea water tank 174 and the oil supply port 32 of the fuel tank 31 are connected to the threshing device 5. It protrudes toward the outside of the aircraft. Thereby, the respective supply ports (the fuel filler port 32 and the water filler port 174a) of the fuel tank 31 and the urea water tank 174 can be arranged close to each other, so that the burden on fuel and water supply operations can be reduced.

As shown in FIGS. 22 and 23, urea water is stored at the rear of the threshing device 5 and at the lower rear of the machine frame 36 (second gutter 39) and the swinging sorting board 57 that constitute the frame of the threshing device 5. A urea water tank 174 is placed overlapping the fuel tank 31. In addition, the urea water tank 174 and the fuel tank 31 are arranged vertically on the inside of the side cover 41 that covers the left side of the threshing device 5, and the fuel filler port 32 and the water filler port 174a are connected to the outer side of the machine from the opening of the side cover 41. It stands out. As a result, the urea water tank 174 can be installed compactly by utilizing the space behind the threshing device 5, and the piping route connects it to the urea water supply device 175 located on the right side of the threshing device 5 (grain tank 7 side). (The urea water supply pipe 179 and the urea water return pipe 180) can be configured to be short.

As shown in FIGS. 22 and 23, the upper part of the fuel tank 31 is tapered (the front and rear width becomes narrower toward the top), and the urea water tank 174 is formed into a substantially inverted U-shape. By shaping the urea water tank 174 to match 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. Further, the urea water tank 174 is mounted on the fuel tank 31 so as to sandwich the fuel tank 31 in the front and back, and the urea water tank 174 is fixed on the fuel tank 31.

The urea water tank 174 is configured to be detachable from the fuel tank 31. At this time, the urea water tank 174 may be configured to be detachable by sliding it in the left and right directions with respect to the fuel tank 31, or the urea water tank 174 may be installed in the vertical direction with respect to the fuel tank 31. It may also be something that can be inserted and removed. At this time, the connection portions between the urea water tank 174, the urea water supply pipe 179, and the urea water return pipe 180 are designed to be detachable using a quick coupler or the like. In this way, by configuring the urea water tank 174 to be separable from the fuel tank 31, not only can water be easily supplied by replacing the urea water tank 174, but also the urea water tank 174 can be removed and stored after work is completed, and the urea water tank 174 can be separated from the fuel tank 31. Prevents quality deterioration.

Next, a first modification of this embodiment will be described below with reference to FIGS. 24 to 26. In this modification, as shown in FIGS. 24 to 26, the urea water tank 174 is arranged below the fuel tank 31, and the urea water tank 174 is arranged so as to be surrounded by the fuel tank. By surrounding the urea water tank 174 with the fuel tank 31, the fuel tank 31 functions as a heat insulating layer, improving the heat retention effect in the urea water tank 174, and preventing deterioration of the urea water stored in the urea water tank 174. can be suppressed.

In the first modification, as shown in FIGS. 25 and 26, a notch 31a is provided on the lower left side of the fuel tank 31 (the side where the fuel filler port 32 is provided), and the urea water tank 174 is fitted into the notch 31a. match. The urea water tank 174 has a shape that matches the notch 31a of the fuel tank 31, and is disposed on the lower left side of the fuel tank 31. The right side is covered.

Further, as shown in FIG. 25, the fuel tank 31 is fixed to the traveling aircraft body 1 with a tank support (support belt) 33. At this time, the fuel tank 31 is fixed by the tank support 33 at a position that overlaps with the storage position of the urea water tank 174 (the position where the notch 31a is formed), so that the urea water tank 174 is also attached to the tank support 33 and attached to the traveling aircraft. It can be supported and fixed to 1. In addition, since the tank support 33 is installed so that it hangs over the left end of the urea water tank 174, the urea water tank 174 can be removed from the fuel tank 31 without removing the tank support 33. Can be separated.

Next, a second modification of this embodiment will be described below with reference to FIGS. 27 to 29. In this modification, as shown in FIGS. 27 to 29, the urea water tank 174 is arranged below the fuel tank 31, and the urea water tank 174 is arranged so as to be surrounded by the fuel tank. 174 has a shape having a convex portion 174x that projects above the water supply port 174a. By providing the convex portion 174x extending above the water supply port 174, a space that is not filled with urea water can be secured in a portion of the convex portion 174x. Therefore, even if the urea water in the urea water tank 174 freezes, the volume of the urea water in the urea water tank 174 is prevented from exceeding the volume of the urea water tank 174, and damage to the urea water tank 174 is prevented. can.

In the second modification, as shown in FIGS. 27 to 29, the left end of the urea water tank 174 is shaped to protrude further outboard (to the left) than the left end of the fuel tank 31. That is, when the urea water tank 174 is fitted into the notch 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. At the left end of the urea water tank 174, a convex portion 174x that protrudes above the water inlet 174a is provided at a position offset from the fuel inlet 32 of the fuel tank 31, and on the upper surface of the convex portion 174x. A breather 174y is provided so that outside air can be taken in.

As shown in FIGS. 28 and 29, by having the breather 174y at a position higher than the water supply port 174a, even if urea water is supplied to the urea water tank 174, the convex portion 174x will not be filled with water. 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 the volume will not exceed the volume of the urea water tank 174. Therefore, damage to the urea water tank 174 can be prevented.

<Additional notes to the invention>
A combine according to one embodiment includes an engine that is a power source mounted on a traveling aircraft, a first case that removes particulate matter in exhaust gas of the engine, and a first case that removes nitrogen oxide substances in exhaust gas of the engine. an exhaust gas purification device consisting of a second case; an engine room in which the engine is installed; a threshing device for threshing grain; and a grain located behind the engine room and into which the grain threshed by the threshing device is transported. In the combine harvester, the exhaust gas purification device is disposed in a concave portion of the grain tank facing the engine room, and the exhaust gas purification device is disposed below the frame forming the engine room. An exhaust connecting pipe is arranged to connect the device, and the exhaust connecting pipe is communicated with an inlet pipe provided in the exhaust gas purification device.

In the above combine harvester, the first case and the second case are arranged so that their respective longitudinal directions are along the front and back of the traveling direction of the traveling body, and the first case has a portion facing the engine. It may be provided with an inlet pipe.

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

According to the above configuration, in the grain tank, the exhaust gas purification device is disposed in a recess facing the engine room in the grain tank, and the exhaust gas purification device is disposed in a recess facing the engine room, and the engine and An exhaust connecting pipe is arranged to connect the exhaust gas purifying device, and an inlet pipe provided in the exhaust gas purifying device is communicated with the exhaust connecting pipe, so that there is no flow between the grain tank and the engine room. , the engine and the exhaust gas purification device can be configured with a short path, and exhaust heat from the engine can be guided to the exhaust gas purification device. As a result, a high purification effect can be maintained in the exhaust gas purification device.

5 Threshing device 7 Grain tank 10 Operating cabin 31 Fuel tank 14 Diesel engine 74 Exhaust gas purification device 75 First case 81 Purification inlet pipe (exhaust gas intake)
82 Purification outlet pipe (exhaust gas outlet)
83 Tail pipe 97 Engine room 91 Engine room frame 92 Left support body (rear side frame)
94 Horizontal frame (rear side frame)
97 Engine room 174 Urea water tank 175 Urea water supply device 229 Second case 236 SCR inlet pipe (exhaust gas intake)
237 SCR outlet pipe (exhaust gas outlet)
239 Urea mixing tube

Claims (3)

A driving part equipped with an engine,
A threshing device that performs threshing processing;
a grain tank located on the side of the threshing device and on the rear side of the driving unit, and storing grains after threshing;
A combine harvester comprising: an exhaust gas purification device that processes exhaust gas from the engine;
As the exhaust gas purification device,
a first case for removing particulate matter contained in the exhaust gas of the engine;
a second case for removing nitrogen oxide substances contained in the exhaust gas after being treated 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 to overlap with the grain tank in plan view and front view,
A recess is formed on the front left side of the grain tank on a surface facing the grain tank and the engine room, and the second case is placed in the recess.
combine. The second case overlaps the grain tank in a side view,
The combine harvester according to claim 1. The second case is arranged along the front surface of the grain tank.
The combine harvester according to claim 1 or 2.