Combine harvester

Abstract

To dispose an exhaust gas treatment device in a preferable state free from any adverse effect from dust.SOLUTION: A combine harvester includes: a motor part including an engine; a thresher for performing threshing processing; a grain tank 6 positioned on a lateral side of the thresher and on a rear side of the motor part to store threshed grains; and an exhaust gas treatment device for treating an exhaust gas from the engine. The combine harvester includes: a first exhaust gas treatment device for reducing particulate matters contained in the exhaust gas from the engine; and a second exhaust gas treatment device 47 for reducing nitrogen oxide contained in the exhaust gas that has been treated by the first exhaust gas treatment device, serving as the exhaust gas treatment device. The second exhaust gas treatment device 47 is deployed while being superposed on the grain tank 6 in plan view and front view.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The present invention relates to a combine harvester, and more particularly to a combine harvester equipped with an exhaust gas treatment device for purifying exhaust gas from an engine. [Background technology]

[0002] Some combine harvesters are equipped with an exhaust gas treatment device that reduces nitrogen oxides (NOx) contained in exhaust gas by using selective catalytic reduction (SCR) with urea water as a reducing agent. Conventionally, such exhaust gas treatment devices have been installed in a low position on the lower side of the machine body in a space formed in the left-right middle position between the threshing device and the grain tank, which are arranged side by side in the lateral direction of the machine body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-166878 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional configuration, the exhaust gas treatment device is installed at a low position in a space formed in the left-right middle position between the threshing device and the grain tank, so there is a risk that dust such as straw dust generated during harvesting work will accumulate on the outer surface of the upper side of the exhaust gas treatment device. On the other hand, the exhaust gas treatment device becomes hot because the exhaust gas discharged from the engine passes through it.

[0005] As a result, the above-described conventional configuration has the disadvantage that dust generated during harvesting work is likely to accumulate on the outer surface of the upper side of the high-temperature exhaust gas treatment device, and there is room for improvement.

[0006] Therefore, when deploying an exhaust gas treatment device, it is desirable to have it in good condition so that it is not adversely affected by dust. [Means for solving the problem]

[0007] The characteristic configuration of the combine harvester of the present invention is that it comprises a power unit located at the front of the body and equipped with an engine, a grain tank located behind the power unit for storing grain after threshing, a first exhaust gas treatment device for reducing particulate matter contained in the exhaust gas of the engine, and a second exhaust gas treatment device for reducing nitrogen oxides contained in the exhaust gas after treatment by the first exhaust gas treatment device, with the second exhaust gas treatment device being located below and in front of the grain tank and arranged so as to overlap with the grain tank in a plan view.

[0008] According to the present invention, the second exhaust gas treatment device is located below the front of the grain tank and is arranged so as to overlap with the grain tank in a plan view, so that the upper side of the second exhaust gas treatment device is covered by the grain tank. As a result, even if dust such as straw dust is scattered during harvesting, there is little risk of the dust accumulating on the outer surface of the upper side of the second exhaust gas treatment device.

[0009] In combine harvesters, the engine is often mounted below the driver's section at the front of the machine, but since the second exhaust gas treatment device is located below the front of the grain tank, the second exhaust gas treatment device can be installed in a location close to the engine mounted at the front of the machine.

[0010] Incidentally, to prevent dust generated during harvesting work from scattering and accumulating, it is conceivable to provide the second exhaust gas treatment device at a location on the rear side of the machine body. However, this configuration would be far from the engine, which would have the disadvantage of making the exhaust gas flow path longer. However, according to the present invention, the second exhaust gas treatment device can be provided at a location close to the engine, so the exhaust gas flow path does not become as long as it would if the second exhaust gas treatment device were provided at a location on the rear side of the machine body. As a result, the exhaust gas flow path is not made longer than necessary, and there is less risk of it being adversely affected by dust.

[0011] Therefore, according to the present invention, when an exhaust gas treatment device is deployed, it can be provided in a good condition without being adversely affected by dust.

[0012] In the present invention, it is preferable that the second exhaust gas treatment device is disposed in a vertical orientation with its longitudinal direction aligned with the vertical direction of the aircraft body.

[0013] According to this configuration, the second exhaust gas treatment device is installed in a vertical position with its longitudinal direction aligned with the vertical direction of the machine body, so the area of ​​the outer surface on the upper side in a plan view is reduced, further reducing the risk of straw dust and the like accumulating on the upper side. Another advantage is that the installation space required in a plan view is smaller than when the second exhaust gas treatment device is installed horizontally.

[0014] In the present invention, it is preferable that the grain tank is formed in a tapered shape when viewed from the front, and that a recessed portion that extends toward the inside of the tank is formed in the tapered inclined surface portion, and that the second exhaust gas treatment device is arranged in a state where it fits into the recessed portion.

[0015] According to this configuration, the grain tank has a sloped surface that tapers downward to guide the harvested grains downward toward a conveying device such as a conveying screw provided at the lower end. A recess is formed in this sloped surface to allow the second exhaust gas treatment device to fit into the recess. In other words, the second exhaust gas treatment device can be installed in a state where it fits into the recess by utilizing the space below the sloped surface, which is sloped in advance to guide the grains downward. The second exhaust gas treatment device can be installed compactly without increasing the installation space in a plan view.

[0016] Therefore, by utilizing the space below the inclined surface portion, the second exhaust gas treatment device can be installed while minimizing the reduction in the capacity of the grain tank and without increasing the installation space in plan view.

[0017] In the present invention, it is preferable that the first exhaust gas treatment device is provided within the power unit in a longitudinal orientation with its longitudinal direction aligned with the fore-and-aft direction of the aircraft, and that an exhaust gas outlet portion formed on the outer side of the aircraft width direction in the first exhaust gas treatment device and an exhaust gas supply portion formed on the outer side of the aircraft width direction in the second exhaust gas treatment device are connected in communication via a connecting member.

[0018] According to this configuration, the exhaust gas outlet portion of the first exhaust gas treatment device and the exhaust gas supply portion of the second exhaust gas treatment device are both formed on the outer side in the width direction of the aircraft, and are connected in communication with each other by a connecting member, so that the first exhaust gas treatment device and the second exhaust gas treatment device can be connected efficiently using as short a route as possible.

[0019] In the present invention, it is preferable that the first exhaust gas treatment device is disposed in an inward position in the lateral width direction of the aircraft above the engine.

[0020] According to this configuration, the first exhaust gas treatment device is located at a location on the inboard side of the fuselage width direction on the top of the engine, so that the connecting member for allowing exhaust gas to flow from the exhaust gas outlet portion of the first exhaust gas treatment device can be deployed in a state where it passes through the inside of the driving unit without protruding outward laterally from the driving unit.

[0021] In the present invention, it is preferable that the engine is supported on the aircraft frame via an elastic support that is elastically deformable, the first exhaust gas treatment device is connected and supported to the engine, the second exhaust gas treatment device is connected and supported to the aircraft frame, and a connecting member that communicates and connects an exhaust gas outlet portion formed on the outer side of the aircraft width direction in the first exhaust gas treatment device and an exhaust gas supply portion formed on the outer side of the aircraft width direction in the second exhaust gas treatment device is composed of a flexible cylindrical body.

[0022] According to this configuration, the first exhaust gas treatment device is connected and supported to the engine, and the second exhaust gas treatment device is connected and supported to the aircraft frame. By connecting them at different locations in this way, the first exhaust gas treatment device and the second exhaust gas treatment device can be efficiently arranged within the limited space inside the power plant.

[0023] The engine is supported on the aircraft frame via an elastic support, and the aircraft frame does not vibrate even when the engine vibrates during operation. In other words, the first exhaust gas treatment device connected and supported to the engine vibrates during engine operation, but the second exhaust gas treatment device connected and supported to the aircraft frame does not vibrate during engine operation. Therefore, by configuring the connecting member as a flexible cylindrical body, it is possible to absorb relative positional fluctuations between the first and second exhaust gas treatment devices and avoid damage to the connection points.

[0024] In the present invention, it is preferable that a vertical support body is provided upright from the aircraft frame, the power generating unit is provided with an engine bonnet that covers the top of the engine, the engine bonnet is supported by the vertical support body so as to be freely rotatable around a vertical axis between a normal position in which it is positioned inside the aircraft body and a maintenance position in which it extends outward laterally from the aircraft body, and the second exhaust gas treatment device is supported by the vertical support body.

[0025] According to this configuration, the engine bonnet is supported by the vertical support body so as to be rotatable about a vertical axis, and by switching the engine bonnet to a maintenance position, the area above the driving unit can be largely opened. By opening the area above the driving unit in this way, maintenance work on the driving unit can be performed efficiently.

[0026] The second exhaust gas treatment device is supported on the vertical support body. The vertical support body has a large support strength to rotatably support the engine bonnet, which is a large component, and can be effectively used to stably support the second exhaust gas treatment device.

[0027] In the present invention, it is preferable that an exhaust pipe that discharges exhaust gas to the outside after being treated in the second exhaust gas treatment device is provided extending rearward, and that a recessed groove into which the exhaust pipe fits is formed in the grain tank.

[0028] According to this configuration, the exhaust gas after being treated in the second exhaust gas treatment device is discharged to the outside through the exhaust pipe. The exhaust pipe, which becomes hot due to the engine exhaust gas flowing through it, is provided in a state where it is inserted into a recessed groove formed in the grain tank.

[0029] As a result, not only the second exhaust gas treatment device but also the exhaust pipe can be prevented from being hit by dust such as straw that is generated and scattered during harvesting operations and accumulating at the top of the exhaust pipe, thereby further reducing the adverse effects of dust. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 1 is a side view of the front of the combine. [Figure 5] FIG. [Figure 6] FIG. 2 is a cross-sectional plan view of the driving section and the motor section. [Figure 7] FIG. [Figure 8] FIG. 2 is an exploded perspective view of an exhaust gas treatment device for a motor unit. [Figure 9] FIG. [Figure 10] 6A is a cross-sectional view taken along line Xa-Xa in FIG. 5, FIG. 6B is a cross-sectional view taken along line Xb-Xb in FIG. 5, and FIG. 6C is a cross-sectional view taken along line Xc-Xc in FIG. [Figure 11] FIG. 4 is an exploded perspective view showing the attached state of the second exhaust gas treatment device. [Figure 12] FIG. 1 is a perspective view of a grain tank. [Figure 13] FIG. 1 is a perspective view of a grain tank. [Figure 14] FIG. 2 is a perspective view of the driver's section structure with the cabin removed. [Figure 15] (a) is a rear view of the grain tank, and (b) is a plan view of the grain tank. [Figure 16] FIG. 2 is a perspective view of the driver's section structure with the cabin removed. [Figure 17] FIG. 2 is a perspective view showing a cooling water flow path. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, in which the embodiment is applied to a head-feeding combine harvester.

[0032] [Overall structure] As shown in Figures 1, 2, and 3, the combine harvester of the present invention is provided with a reaping unit 2 for reaping planted stalks at the front of a traveling body that is self-propelled by a pair of left and right crawler traveling devices 1, 1. A driving unit 4 surrounded by a cabin 3 is provided at the front right side of the traveling body, and a threshing device 5 for threshing the stalks reaped by the reaping unit 2 and a grain tank 6 for storing the grains obtained by the threshing process are provided side by side at the rear of the traveling body. A motor unit 8 is provided below a driver's seat 7 in the driving unit 4 of the traveling body, and an unloader 9 is provided for discharging grain stored in the grain tank 6 outside the machine. In this embodiment, the left and right directions of the machine body are defined as right and left sides when viewed from the direction of travel in the forward direction of the machine body. Specifically, in Figure 3, the location where the reaping unit 2 is located corresponds to the front of the machine body, the side where the threshing device 5 is located corresponds to the left side of the machine body, and the side where the grain tank 6 is located corresponds to the right side of the machine body.

[0033] The harvesting section 2 is equipped with a weeding tool 10 that guides the base of the planted culms to be harvested, a plurality of lifting devices 11 that lift the planted culms that have been harvested into a vertical position, a clipper-type harvesting device 12 that cuts the base of the raised planted culms, and a vertical transport device 13 that transports the harvested culms backward while gradually changing their position from a vertical position to a horizontal position.

[0034] The mowing unit 2 is supported entirely by a mowing unit frame 15 extending from the machine body frame 14. The mowing unit frame 15 is supported by the machine body frame 14 so as to be able to swing freely about a horizontal axis and extends toward the front of the machine body. By swinging this mowing unit frame 15 by a lifting cylinder 16, the grass dividing tool 10 can be raised and lowered between a lowered working state in which it is lowered close to the ground and an elevated non-working state in which it is raised high above the ground.

[0035] By moving the traveling machine body while the reaping unit 2 is in the lowered working state, the reaping unit 2 introduces the planted culms to be reaped into the rear raising device 11 using the weed dividing tool 10 and raises them. The planted culms to be raised are then reaped by the clipper-shaped reaping device 12, and the reaped culms are transported rearward by the vertical transport device 13 and supplied to the threshing feed chain 5a of the threshing device 5.

[0036] The threshing device 5 clamps and transports the base side of the supplied harvested stalks toward the rear of the machine body using the threshing feed chain 5a, while supplying the ear side to the threshing chamber for threshing. Although not shown, the processed material after threshing in the threshing chamber is sorted into grains and straw dust in a sorting section below, and the grains are transported out to the right side of the threshing device 5 by a first grain transport screw (not shown), and then lifted by a grain lifting conveyor 17 and transported inside the grain tank 6. The grain tank 6 stores the grain sent from the threshing device 5. The grain stored in the grain tank 6 is then transported to the outside by an unloader 9.

[0037] As shown in Fig. 3, the driver's section 4 includes a cabin 3, a driver's seat 7, a front panel 18 located in front of the driver's seat 7, a floor section 19 located between the front panel 18 and the driver's seat 7, and a side panel 20 located to the side of the driver's seat 7 on the side facing the reaping section 2. The driver's seat 7 is supported on the top of an engine bonnet 22 that covers the top of a diesel engine 21 provided in the power unit 8.

[0038] As shown in Figure 13, the engine bonnet 22 includes a front panel portion 22a located on the front side of the aircraft body of the engine 21, a top panel portion 22b located on the upper side of the aircraft body of the engine 21, and an air supply chamber component portion 22c formed behind the driver's seat 7 and connected to the rear of the top panel portion 22b, forming an engine room that opens inward in the lateral direction of the aircraft body and downward toward the aircraft body.

[0039] As shown in Fig. 3, the driver's section 4 is supported by the vehicle frame 14 integrally with the engine bonnet 22 so as to be able to swing open and close about a vertical axis Y1 on the left rear side. That is, as shown in Fig. 6, the engine bonnet 22, front panel 18, side panels 20, floor 19, driver's seat 7, cabin 3, etc. are integrally connected to form a driver's section structure 23.

[0040] As shown in FIGS. 4 to 6, a square cylindrical support pillar 24 stands upright from the machine frame 14 at the left rear side of the driver's station 4 as a vertical support. The driver's section structure 23 is supported by the support column 24 via a support member 25 so as to be able to swing freely about the vertical axis Y1. The support member 25 includes an arm member 25a extending rearward from the inner end of the driver's section structure 23 in the width direction of the machine body on the rear side of the machine body, and a pivot boss member 25b connected to the rear end of the arm member 25a and having a through-hole extending vertically. The pivot boss member 25b is rotatably fitted and supported on a pivot shaft member 24a (see FIG. 11) provided on the upper end of the support column 24. The upper end of the pivot boss member 25b is rotatably supported by a bracket 5b supported on the right wall of the threshing device 5. The support column 24 has the support strength required to rotatably support large structures such as the engine bonnet 22 and the cabin 3.

[0041] Therefore, the driving section structure 23 is supported so as to be rotatable about the vertical axis Y1, and is configured so as to be freely switchable between a normal position in which the driving section structure 23 is positioned inside the machine body so as to cover the upper part of the driving section 8, as shown by the solid line in Fig. 3, and a maintenance position in which the driving section structure 23 projects outward from the machine body so as to open up the upper part of the driving section 8, as shown by the two-dot chain line in Fig. 3. By switching to the maintenance position, the upper part of the driving section 8 is largely opened up, making it easier to perform maintenance work on the driving section 8.

[0042] 15, the bottom of the grain tank 6 is formed in a generally V-shape tapering downwards when viewed from the front, and a conveying screw 26 that conveys the grains stored in the tank outward from the rear of the machine body is provided at the lowest end of the grain tank 6. The grains conveyed outward from the rear of the machine body by the conveying screw 26 are then conveyed by the unloader 9 and discharged outward from the machine body.

[0043] As shown in Figure 1, the unloader 9 is equipped with a vertical feed screw conveyor 27 that vertically conveys the grains conveyed by the conveying screw 26 upward, and a horizontal feed screw conveyor 29 that is connected to the top of the vertical feed screw conveyor 27 and horizontally conveys the grains to a discharge outlet 28 at the tip. The unloader 9 is provided so as to be rotatable about a vertical axis Y2 that is the central axis of the vertical feed screw conveyor 27, and is provided so as to be rotatable between a storage position where the horizontal feed screw conveyor 29 is stored inside the machine body and located at the top of the machine body by driving a rotation motor (not shown), and a discharge position where it projects out laterally to the outside of the machine body.

[0044] [Grain tank] The grain tank 6 will now be described. 12, 13, and 15, the grain tank 6 is tapered downward when viewed from the front of the machine, and a first recess Q1 that is generally rectangular in plan view and generally diamond-shaped when viewed from the front of the machine is formed on the tapered bottom inclined surface portion 6a toward the front of the machine. The first recess Q1 is surrounded by an inner vertical surface 6b that is in a vertical, longitudinal orientation, a rear vertical surface 6c that is in a vertical orientation and is inclined from the front end of the inner vertical surface 6b toward the front of the machine as it moves inward, and an upper side surface 6d that is in a diagonal orientation and generally parallel to the bottom inclined surface portion 6a. A second exhaust gas treatment device 47, described later, is installed in a state where it fits into this first recess Q1.

[0045] On the upper side of the first recess Q1, there is formed a bulging portion 6A formed by a front left side surface 6e in a vertical position located close to the right wall of the threshing device 5, an upper inclined surface 6f extending diagonally upward and to the left from the upper end of the front left side surface 6e toward the top of the threshing device 5, an extended vertical surface 6g in a vertical position extending upward from the upper end of the upper inclined surface 6f, a front surface 6h located on the front side, and a rear surface 6i located on the rear side. By forming the bulging portion 6A that bulges out toward the top of the threshing device 5 in this way, it is possible to increase the amount of grain stored.

[0046] A second recess Q2 is formed as a groove connected to the first recess Q1 on the rear side of the vehicle body and positioned upward toward the rear of the vehicle body. The second recess Q2 is formed in a groove shape surrounded by an innermost vertical surface 6k formed in a state extending from a right vertical surface 6j formed vertically from the upper end of the bottom inclined surface portion 6a to the inside of the tank, a bottom surface 6l positioned obliquely upward toward the rear of the vehicle body, and an upper surface 6m positioned obliquely upward toward the rear of the vehicle body. An exhaust pipe 92, which will be described later, is disposed in a state where it fits into this second recess Q2.

[0047] A third recess Q3 is formed adjacent to the second recess Q2 at the rear side of the machine body and extends vertically. The third recess Q3 is formed on the right side of the grain tank 6, extending vertically from the bottom inclined surface portion 6a to the upper end of the tank and recessed toward the inside of the tank (the right side of the machine body). The third recess Q3 is surrounded by the rear surface (front vertical surface) 6i of the bulging portion 6A, the rear vertical surface 6n located on the rear side and inclined toward the rear of the machine body as it approaches the left side of the machine body, and the narrow inner vertical surface 6o located at the innermost side. The grain lifting conveyor 17 is arranged to fit into this third recess Q3.

[0048] A fourth recess Q4, which is generally rhombic in plan view (see FIG. 15 ), is formed adjacent to the third recess Q3 and cuts out the lower portion of the rear vertical surface 6n and the rear left side surface 6p of the second recess Q2. The fourth recess Q4 is surrounded by an inner vertical surface 6q facing vertically forward and backward, a rear vertical surface 6r that is vertically oriented and inclined toward the front of the machine from the front end of the inner vertical surface 6q toward the inside of the machine, and an upper side surface 6s that is inclined and generally parallel to the bottom inclined surface portion 6a. A second return device (not shown) that returns second-grade grains, such as stalk-attached rice, generated in the sorting section of the threshing device 5 to the threshing chamber is installed in this fourth recess Q4. A fifth recess Q5 is formed at the rear left side of the grain tank 6 to allow passage of a straw conveying device (not shown). As shown in Figure 13, a fifth recess Q5 is formed from the left side surface 6p on the rear side to the rear surface 6t on the rear side, with an inclined surface 6u that is inclined toward the right side of the aircraft body as it approaches the rear of the aircraft body.

[0049] The front left side surface 6e and the rear left side surface 6p are located at approximately the same position in the left-right direction of the vehicle, and the extended vertical surface 6g of the bulging portion 6A is located at a position that protrudes further to the right of the vehicle than the front left side surface 6e and the rear left side surface 6p. The innermost vertical surface 6k of the second recessed portion Q2 and the inner vertical surface 6q of the fourth recessed portion Q4 are located at approximately the same position in the left-right direction of the vehicle.

[0050] As shown in Figure 3, the grain tank 6 is supported so as to be rotatable about the vertical axis Y2, which is the rotation axis of the vertical feed screw conveyor 27, and is provided so that its position can be freely changed between a normal working position (shown by the solid line in Figure 3) in which it is retracted inside the machine body, and a maintenance position (shown by the two-dot chain line in Figure 3) in which it protrudes outward to the side of the machine body. When switching the driving section structure 23 to the maintenance position, it is necessary to switch the grain tank 6 to the maintenance position.

[0051] [Motor unit] The motor unit 8 will now be described. As shown in Figures 5 to 7, the driving unit 8 is provided with an engine 21 that is housed within an engine bonnet 22, and this engine 21 is mounted and supported on the vehicle frame 14 via a rubber mounting mechanism 30 that serves as an elastic support body, with the crankshaft direction being oriented laterally to the vehicle body.

[0052] As shown in Fig. 7, an intake wall 31 is provided at the outer lateral end of the engine bonnet 22. A radiator 33 for cooling the engine, connected to the engine 21 via a cooling water circulation pipe 32, is provided between the engine 21 and the intake wall 31 in a state supported by the aircraft frame 14. A cooling fan 34 is provided between the radiator 33 and the engine 21, and the circulating cooling water is cooled by the air blown by the cooling fan 34, thereby cooling the engine 21.

[0053] The intake wall 31 includes a support frame 35 connected to the engine bonnet 22, and a dustproof section 36 supported so as to be openable and closable relative to the support frame 35. The dustproof section 36 includes a peripheral frame 36a supported by the support frame 35 so as to be openable and closable about a vertical axis via a hinge (not shown) provided at the rear end of the dustproof section 36, and a perforated intake plate 36b that doubles as a dust remover and is stretched over the peripheral frame 36a.

[0054] 1 to 4, a precleaner 38 is provided near the rear of the ceiling 3a of the cabin 3 while being supported by the ceiling 3a, and an air cleaner 39 is provided in an air supply chamber component 22c formed behind the driver's seat 7. As shown in Fig. 7, a supercharger 40 is provided near the front side of the aircraft above the engine 21 inside the engine bonnet 22, and an intercooler 41 is provided between the intake wall 31 and the radiator 33 inside the engine bonnet 22.

[0055] The turbocharger 40 is driven by exhaust gas emitted by the engine 21, and external air is cleaned of dust by a precleaner 38 and an air cleaner 39. The dust-cleaned air is then drawn into the turbocharger 40 to generate compressed air, which is then sent to an intercooler 41 for cooling, and the cooled compressed air is supplied to the engine 21 as combustion air.

[0056] 4, 7, and 8, a first oil cooler 42 for cooling hydraulic oil supplied to a hydraulic continuously variable transmission (HST) and a second oil cooler 44 for cooling hydraulic oil supplied to a hydraulic device such as a hydraulic clutch (not shown) provided in a transmission case are provided between the intake wall 31 and the radiator 33. An oil filter 45 is provided between the intake wall 31 and the radiator 33, adjacent to the front side of the second oil cooler 44, and interposed in a hydraulic oil passage to the second oil cooler 44.

[0057] The power unit 8 is equipped with a first exhaust gas treatment device 46 that reduces particulate matter contained in the exhaust gas from the engine 21, and a second exhaust gas treatment device 47 that reduces nitrogen oxides contained in the exhaust gas after it has been treated by the first exhaust gas treatment device 46.

[0058] The first exhaust gas treatment device 46 is equipped with a diesel particulate filter (DPF) (not shown), which is a known technology for capturing diesel particulates contained in exhaust gas, and performs an exhaust gas purification process to reduce the particulates as the exhaust gas passes through.

[0059] The second exhaust gas treatment device 47 is a treatment device that uses selective catalytic reduction (SCR), a well-known technology. Specifically, urea water, which is an example of a reducing agent, is injected into the exhaust gas to hydrolyze it and generate ammonia. The ammonia (NH3) then chemically reacts with nitrogen oxides (NOx) contained in the exhaust gas to reduce them to nitrogen (N2) and water (H2O), thereby purifying the exhaust gas and reducing the nitrogen oxides contained in the exhaust gas.

[0060] [First exhaust gas treatment device] The first exhaust gas treatment device 46 will now be described. As shown in Figures 5 to 8, the first exhaust gas treatment device 46 is arranged inside the engine bonnet 22, and the entire device is biased toward the cutting section 2, i.e., toward the inside of the width of the vehicle, relative to the driver's seat 7, and is arranged below the side panel 20 and above the engine 21 at a location toward the inside of the width of the vehicle.

[0061] The first exhaust gas treatment device 46 is connected and supported to the engine 21 by a pair of support parts 48, 49 located on both the front and rear sides of the aircraft body, with the first exhaust gas treatment device 46 located above the engine 21 and with its longitudinal direction aligned with the front-to-rear direction of the aircraft body. The pair of support parts 48, 49 are provided in a distributed arrangement on both the front and rear sides of the aircraft body relative to the crankshaft 21a of the engine 21.

[0062] The first exhaust gas treatment device 46 is provided with an exhaust gas inlet 50 at a lower location on the front side of the aircraft body, and an exhaust gas outlet 51 at a right location on the rear side of the aircraft body. The exhaust gas inlet 50 is connected to an exhaust pipe 52 on the engine 21 side that extends from the turbocharger 40.

[0063] [Second exhaust gas treatment device] The second exhaust gas treatment device 47 will be described. 3 to 6, the second exhaust gas treatment device 47 is provided in a state where it is located on the rear side of the driving section 4 in a plan view so as to be located outside the engine bonnet 22. The second exhaust gas treatment device 47 is located below the front of the grain tank 6 and is arranged in a state where it overlaps with the grain tank 6 in a plan view.

[0064] As described above, the grain tank 6 is formed in a tapered shape when viewed from the front, and the tapered bottom inclined surface portion 6a is formed with a first recess Q1 that recesses toward the inside of the tank. The second exhaust gas treatment device 47 is disposed so as to fit into the first recess Q1. The second exhaust gas treatment device 47 is disposed in a vertically placed position with its longitudinal direction aligned with the up-down direction.

[0065] 4 to 8, the second exhaust gas treatment device 47 includes a cylindrical dosing section 56 that injects and supplies urea water to the exhaust gas supplied from the first exhaust gas treatment device 46, and a main treatment section 57 that is cylindrical and has a larger diameter than the dosing section 56 and performs reduction treatment. The dosing section 56 and the main treatment section 57 are integrally connected at their lower parts, and are connected in communication with each other at the connecting point so that the exhaust gas into which the urea water has been injected in the dosing section 56 is supplied to the main treatment section 57.

[0066] The main processing unit 57 is disposed in a position where the direction along the central axis of its cylindrical shape is aligned with the vertical direction of the machine body. The cylindrical dosing unit 56 is located on the right side of the machine body relative to the main processing unit 57, and is disposed in a state where it is aligned parallel to the main processing unit 57, with the direction along the central axis of its cylindrical shape aligned with the vertical direction of the machine body. Therefore, the second exhaust gas treatment device 47 is disposed in a vertically placed position where the longitudinal direction, i.e., the direction along the central axes of the cylindrical shapes of the cylindrical main processing unit 57 and the dosing unit 56, is aligned with the vertical direction.

[0067] The second exhaust gas treatment device 47 is supported at an upper portion and a lower portion of the support pillar 24 by an upper connecting support portion 58 and a lower connecting support portion 59, respectively.

[0068] The upper connecting support portion 58 will now be described. As shown in FIG. 11 , the upper connecting support portion 58 includes an upper connecting bracket 60 that is integrally connected to the support column 24. The upper connecting bracket 60 is configured as a plate with an L-shaped cross section, including a strip-shaped vertical connecting portion 60a that is long in the widthwise direction of the aircraft body and a strip-shaped horizontal connecting portion 60b that is long in the widthwise direction of the aircraft body. A notched recess 60c is formed in the upper connecting bracket 60 to accommodate the support column 24, and the support column 24 is integrally connected by welding so that it abuts against the notched recess 60c over a wide contact area. Connecting bolts 61 are welded to the horizontal connecting portion 60b of the upper connecting bracket 60 at two locations spaced apart in the longitudinal direction, i.e., the widthwise direction of the aircraft body. The connecting bolts 61 are provided in an upward orientation with their heads positioned downward and their threads positioned upward.

[0069] A plate-shaped support portion 62 is formed integrally with the outer periphery of the upper side of the main body processing portion 57 in a state where it protrudes radially outward. With this plate-shaped support portion 62 placed on the upper side of the upper connecting bracket 60, the upper connecting bracket 60 and the plate-shaped support portion 62 are connected by a pair of connecting bolts 61. A pair of upper and lower reinforcing plates 63 are provided in a state where they sandwich the plate-shaped support portion 62 from both the top and bottom, increasing the support strength of the bolt connection points.

[0070] Of the pair of connecting bolts 61, the connecting bolt 61 closer to the dosing unit 56 is fastened together with the upper connecting bracket 60, the plate-shaped support part 62, and a support bracket 64 for supporting the dosing unit 56. The support bracket 64 is connected to a piping connection point, which will be described later.

[0071] Next, the lower connecting support part 59 will be described. 11, the lower connecting support part 59 is equipped with a lower connecting bracket 66. This lower connecting bracket 66 is made up of a plate that is approximately U-shaped when viewed from the side of the aircraft, is fixed integrally to the right side of the support pillar 24 by welding, and extends cantilevered to the right.

[0072] Similar to the upper plate-shaped support portion 62, a plate-shaped support portion 67 is integrally formed on the outer periphery of the lower side of the main processing portion 57 so as to protrude radially outward. This plate-shaped support portion 67 and an attachment plate 68 that is L-shaped in side view are connected by a pair of connecting bolts 69 that run along the up-down direction. The attachment plate 68 is then connected to the lower connecting bracket 66 by a pair of connecting bolts 70 that run along the front-rear direction.

[0073] When attaching the second exhaust gas treatment device 47 to the support column 24, the lower plate-shaped support portion 67 and the mounting plate 68 are connected in advance with vertical connecting bolts 69. Then, the upper plate-shaped support portion 62 is placed on the upper connecting bracket 60 while the vertical connecting bolts 61 are inserted through them, and the connecting bolts 61 are connected by tightening nuts on the connecting bolts 61. The lower mounting plate 68 is placed against the lower connecting bracket 66, and the pair of front-rear connecting bolts 69 are connected by tightening nuts on them. As with the upper connecting support portion 58, a pair of upper and lower reinforcing plates 63 are provided to sandwich the plate-shaped support portion 67 from above and below, increasing the support strength of the bolt connection points.

[0074] 6, the first exhaust gas treatment device 46 has an exhaust gas outlet section 51 formed therein, located on the right side of the machine body (outer side in the width direction of the machine body) at the rear side of the machine body. On the other hand, the second exhaust gas treatment device 47 has an exhaust gas supply section 54 formed at an upper side of a dosing section 56 located on the right side of the machine body (outer side in the width direction of the machine body) with respect to the main treatment section 57.

[0075] The exhaust gas outlet 51 of the first exhaust gas treatment device 46 and the exhaust gas supply unit 54 of the second exhaust gas treatment device 47 are connected in communication with each other via a communication connection pipe 65 serving as a connecting member. The communication connection pipe 65 is flange-connected to the exhaust gas outlet 51 of the first exhaust gas treatment device 46, and is also flange-connected to the exhaust gas supply unit 54 of the second exhaust gas treatment device 47.

[0076] A support bracket 64 is fastened to the flange connection portion between the communicating connection pipe 65 and the exhaust gas supply unit 54 of the second exhaust gas treatment device 47. Therefore, the upper portion of the dosing unit 56 is supported on the main processing unit 57 by this connection.

[0077] The communication connection pipe 65 is made of a flexible cylindrical body. Specifically, it is provided with a bellows-shaped cylindrical bellows tube 65A in the middle, and is configured to be able to bend and deform. By providing the bellows tube 65A, vibrations of the engine 21 are prevented from being transmitted to the second exhaust gas treatment device 47, and the second exhaust gas treatment device 47 is supported in a stable state.

[0078] That is, the engine 21 is supported on the vehicle frame 14 via the rubber mount mechanism 30, and the first exhaust gas treatment device 46 is connected and supported to the engine 21 as described above, while the second exhaust gas treatment device 47 is supported on the vehicle frame 14 via the support struts 24. Therefore, by absorbing vibrations with the bellows tube 65A, it is possible to support the second exhaust gas treatment device 47 in a stable state while allowing vibrations of the first exhaust gas treatment device 46 that accompany vibrations of the engine 21.

[0079] Next, a configuration for supplying urea water as a reducing agent to the second exhaust gas treatment device 47 will be described. An aqueous urea tank 71 for storing aqueous urea is provided closer to the front of the vehicle than the engine 21. Specifically, as shown in Figures 4 and 8, the aqueous urea tank 71 is supported by the vehicle frame 14 while being located below the floor 19 of the driver's section 4. A battery 72 is provided closer to the front of the vehicle than the aqueous urea tank 71.

[0080] Below the driver's section, on both the front and rear sides, support frames 73A, 73B are extended from the vehicle frame 14 and are formed in a generally inverted U-shape when viewed from the front of the vehicle so as to bypass the area above the urea water tank 71 and the battery 72. These support frames 73A, 73B function as receiving bodies that receive and support the floor 19 of the driver's section 4 when the driver's section structure 23 is in the closed state.

[0081] 4, 6, and 8, the system is provided with a urea water transfer pipe 74 that connects the urea water tank 71 and the second exhaust gas treatment device 47, and a pump 75 that feeds the urea water stored in the urea water tank 71 to the second exhaust gas treatment device 47 through the urea water transfer pipe 74. The pump 75 is attached to a bracket 76 connected to the support frame 73A, in a state where it is located between the engine 21 and the urea water tank 71 in a plan view. The support frame 73A is provided as an extension integrally with the body frame 14, and therefore the bracket 76 is supported by the body frame 14.

[0082] The urea water transfer pipe 74 includes a suction pipe 77 that transfers the urea water from the urea water tank 71 to the pump 75 by suction of the pump 75, a supply pipe 78 that feeds the urea water from the pump 75 to the second exhaust gas treatment device 47, and a return pipe 79 that returns excess urea water to the urea water tank 71. The suction pipe 77 connects the urea water tank 71 to the pump 75. The supply pipe 78 connects the pump 75, which is located on the front side of the engine 21, to the second exhaust gas treatment device 47, which is located on the rear side of the engine 21. The return pipe 79 connects the urea water tank 71, which is located on the front side of the engine 21, to the second exhaust gas treatment device 47, which is located on the rear side of the engine 21.

[0083] 8, the supply pipe 78 and the return pipe 79 of the urea water transfer pipe 74 are arranged in the middle between the engine 21 and the radiator 33 in the width direction of the aircraft, i.e., on the outer side of the engine 21 in the width direction of the aircraft (right side of the aircraft), and below the cooling fan 34 on the inner side of the radiator 33 in the width direction of the aircraft (left side of the aircraft). By arranging them in this way, they do not interfere with the flow of radiator cooling air, and furthermore, they are located on the outer side of the aircraft side of the engine 21, i.e., upstream of the engine 21 in terms of the cooling air, so they can be arranged in a state where they are less affected by the temperature of the engine 21.

[0084] When the pump 75 operates, it sucks in urea water from inside the urea water tank 71 through the suction pipe 77 and delivers the sucked urea water through the supply pipe 78 to the injection supply unit 80 of the dosing unit 56 in the second exhaust gas treatment device 47. Any remaining urea water that has not been injected is returned to the urea water tank 71 through the return pipe 79.

[0085] When working in cold climates, etc., there is a risk that the urea water will freeze, so freezing can be prevented by using engine coolant circulated and supplied to the radiator 33. That is, as shown in Fig. 17, a heater 81 formed by bending a pipe member into a coil shape is provided inside the urea water tank 71, and engine coolant is circulated through this heater 81 to heat the stored urea water and prevent freezing. A coolant flow path 82 through which the engine coolant circulates is formed by the heater 81. Although not shown, a switching device is provided that can freely switch between a supply state in which engine coolant is supplied to the heater 81 and a stop state in which the supply is stopped.

[0086] The urea water is consumed as the engine 21 operates, and therefore the amount of urea water stored in the urea water tank 71 decreases according to the operating time of the engine 21. Therefore, when the amount of urea water stored decreases, the urea water tank 71 needs to be replenished with urea water.

[0087] As shown in FIG. 12 , an inspection opening 83 for the urea water tank 71 is formed on the side of the motor unit 8, i.e., on the side below the driver's unit 4, so that the urea water can be refilled without opening the driver's unit structure 23, which is a large device including the cabin 3.

[0088] The driver's section structure 23 is provided with a floor frame body 84 that constitutes the floor section 19 of the driver's section 4, and a footrest 85 for the driver to board is provided below the boarding / exiting section of the floor frame body 84. A vertically oriented side wall 86 is provided between the footrest 85 and the floor frame body 84. An inspection opening 83 is formed in the side wall 86, and the urea water tank 71 can be refilled with urea water through this inspection opening 83.

[0089] When replenishment work is not being performed, the inspection opening 83 is covered by a lid 87. This lid 87 is made of a flat plate-like body and is supported on the side wall 86 so that it can swing open and closed around a longitudinal fulcrum at its lower end. When the lid 87 is closed, the swing end side is attracted by a magnet, maintaining the closed state, and it can be opened by manually moving it outward against the magnetic attraction. Instead of being made of a flat plate-like body, the lid 87 that covers the inspection opening 83 may be made of a plate-like body that is bent into a substantially L-shape when viewed in the longitudinal direction of the machine body, as shown in FIG. 16 , for example.

[0090] An inspection opening for the urea water tank 71 is formed not only in the side wall 86 but also in the floor portion 19. As shown in Fig. 14, the floor frame body 84 is shaped to have a large inspection opening 88 in its center. A floor forming body 89 is placed on top of this floor frame body 84 over the entire floor portion 19, thereby forming the floor portion 19 on which the driver can stand.

[0091] When refilling the urea water tank 71 with urea water, the floor formation body 89 is moved to open up the upper part of the floor frame body 84, and the work can be performed through the wide open inspection opening 88.

[0092] 5, an exhaust gas outlet pipe 90 is provided at a location above the main processing unit 57 of the second exhaust gas treatment device 47 and toward the rear of the machine body. The exhaust gas outlet pipe 90 has a base end side portion 90a that extends horizontally or nearly horizontally from an exhaust gas outlet portion 91 of the second exhaust gas treatment device 47 toward the rear of the machine body, and a bent tip side portion 90b that bends from the extending end of the base end side portion 90a toward the rear of the machine body and then extends upward and rearward of the machine body.

[0093] [Exhaust pipe] An exhaust pipe 92 is provided to discharge to the outside the exhaust gas that is treated in the first exhaust gas treatment device 46 and the second exhaust gas treatment device 47 and discharged through the exhaust gas outflow pipe 90. This exhaust pipe 92 is extended rearward and upward between the threshing device 5 and the grain tank 6 so that its tip is positioned above the upper end of the threshing device 5. An exhaust port 93 formed at the tip of the exhaust pipe 92 is formed in a horizontally open shape so as to discharge the exhaust gas toward above the threshing device 5.

[0094] 5 and 9, the exhaust pipe 92 includes a first exhaust pipe 92A located on the second exhaust gas treatment device 47 side and a second exhaust pipe 92B located on the exhaust port 93 side. The first exhaust pipe 92A extends from a position corresponding to the exhaust gas outlet 91 of the second exhaust gas treatment device 47 in an upwardly tilted rearward position. The second exhaust pipe 92B extends from a position corresponding to the exhaust gas outlet 91 of the first exhaust pipe 92A in an upwardly tilted rearward position with a larger upward gradient than the upward gradient of the first exhaust pipe 92A. Therefore, the inclination angle of the first exhaust pipe 92A and the inclination angle of the second exhaust pipe 92B are different in a side view, and the inclination angle of the second exhaust pipe 92B is set to be larger than the inclination angle of the first exhaust pipe 92A.

[0095] The first exhaust pipe 92A extends from the outlet of the exhaust gas outflow pipe 90 to a position corresponding to the upper end of the threshing device 5. As shown in Figure 10, this first exhaust pipe 92A includes a cylindrical inner pipe 94 located on the inside, a cylindrical outer pipe 95 located on the outside, and a cover member 96 with a substantially U-shaped cross section that covers the outer side of the outer pipe 95.

[0096] The inner pipe 94 is inserted into the outer pipe 95 and fixed to the outer pipe 95. The front portion of the outer pipe 95 is supported on the right side wall of the threshing device 5 via a mounting bracket 97. The rear portion of the outer pipe 95 is supported on a connecting member 99 via a mounting bracket 98 to support the grain lifting conveyor 17 on the right side wall of the threshing device 5. The cover member 96 is fixed to two mounting brackets 100 provided on the outer pipe 95 by bolt connections.

[0097] The exhaust upstream end of the inner pipe 94 protrudes from the exhaust upstream end of the outer pipe 95 and is formed with an expanded diameter section 101 whose diameter increases toward the exhaust upstream side. The expanded diameter section 101 and the exhaust gas outflow pipe 90 overlap along the exhaust flow direction, and a gap is formed radially between them. With this configuration, as exhaust gas is sent from the exhaust gas outflow pipe 90 of the second exhaust gas treatment device 47 to the inner pipe 94 of the first exhaust pipe 92A, outside air is drawn in through the gap by the ejector action, thereby cooling the exhaust gas.

[0098] The exhaust downstream end of the inner pipe 94 protrudes from the exhaust downstream end of the outer pipe 95, and the point where the second exhaust pipe 92B is attached is inclined at the same angle as the inclination angle of the second exhaust pipe 92B in a side view.

[0099] As shown in FIG. 10 , the second exhaust pipe 92B is configured such that a left half 103 and a right half 104 are connected to form a hexagonal cross section. This second exhaust pipe 92B is attached to the exhaust downstream end of the inner pipe 94 of the first exhaust pipe 92A, extending downstream in the exhaust flow direction. As shown in FIG. 10 (b), three approximately L-shaped stays 105 are welded to the exhaust downstream end of the inner pipe 94 at equal intervals in the circumferential direction. The second exhaust pipe 92B is connected to these three stays 105 with bolts. This second exhaust pipe 92B extends rearward and upward so as to be located above the upper end of the threshing device 5.

[0100] As shown in FIG. 10(a), the left half 103 of the second exhaust pipe 92B is shorter in the longitudinal direction of the exhaust pipe (exhaust flow direction) than the right half 104, and a cover 106 is provided at the exhaust downstream end of the left half 103, i.e., the rear upper tip of the exhaust pipe 92, to block the flow of exhaust gas inside the exhaust pipe. As a result, the exhaust downstream side of the left half 103 is open, forming a horizontally open exhaust port 93. Therefore, the exhaust port 93 is located above the top end of the threshing device 5, and is formed horizontally open so as to discharge exhaust gas toward above the threshing device 5.

[0101] The tip of the exhaust pipe 92 is located below the upper end of the grain tank 6, and furthermore, the tip of the exhaust pipe 92 is located below the lateral feed screw conveyor 29 of the unloader 9 when it is in the storage position. Therefore, there is no risk of the exhaust pipe 92 interfering with the unloader 9 not only when the unloader 9 (lateral feed screw conveyor 29) is stored in the storage position, but also if it moves out of the storage position due to machine vibration or the like.

[0102] A second recess Q2 is formed on the side of the grain tank 6 facing the threshing device 5, connected to the rear side of the machine body of the first recess Q1 and positioned upward toward the rear of the machine body. This second recess Q2 is formed in a state of extending in an upwardly inclined rearward position from a position corresponding to the exhaust gas outlet 91 of the second exhaust gas treatment device 47.

[0103] As described above, a cover member 96 having a generally U-shaped cross section is provided at the portion of the exhaust pipe 92 where it enters the second recess Q2 of the grain tank 6. The cover member 96 is provided with a radial gap between it and the outer pipe 95 and between it and the grain tank 6, and forms an insulating layer with air to make it difficult for heat from the exhaust gas to be transmitted to the grain tank 6.

[0104] 5 and 6, a cover body 108 that covers the outer periphery of the second exhaust gas treatment device 47 is provided between the second exhaust gas treatment device 47 and the grain tank 6. The cover body 108 is provided with a gap between it and the second exhaust gas treatment device 47 and between it and the grain tank 6, and forms an insulating layer with air to make it difficult for heat from the second exhaust gas treatment device 47 to be transmitted to the grain tank 6. The cover member 96 and the cover body 108 are connected in communication at the point where the exhaust pipe 92 passes through.

[0105] In the above configuration, exhaust gas emitted from the engine 21 and passed through the turbocharger 40 is introduced into the first exhaust gas treatment device 46 through the exhaust gas inlet 50 and subjected to a purification process to reduce diesel particulates, and the exhaust gas that has completed the purification process is supplied to the second exhaust gas treatment device 47 through the communicating connection pipe 65.

[0106] In the second exhaust gas treatment device 47, urea water is injected into the exhaust gas to generate ammonia, and the nitrogen oxides contained in the exhaust gas are subjected to a chemical reaction with the ammonia, reducing them to nitrogen and water, thereby performing a purification process to reduce the nitrogen oxides contained in the exhaust gas, and the exhaust gas that has completed the purification process is discharged outside the aircraft through the exhaust pipe 92.

[0107] [Another embodiment] (1) In the above embodiment, the second exhaust gas treatment device 47 is shown as being deployed in a vertical orientation with its longitudinal direction aligned with the vertical direction of the aircraft body. However, instead of this configuration, the second exhaust gas treatment device 47 may be deployed in various orientations, such as an orientation with its longitudinal direction aligned with the fore-aft direction of the aircraft body or an orientation with its longitudinal direction aligned with the width direction.

[0108] (2) In the above embodiment, the first recess Q1 is formed in the tapered bottom inclined surface portion 6a of the grain tank 6, and the second exhaust gas treatment device 47 is arranged so as to fit into the first recess Q1. However, instead of this configuration, the second exhaust gas treatment device 47 may be arranged so as to fit into the lower side of the tapered bottom inclined surface portion 6a of the grain tank 6 without forming the first recess Q1.

[0109] (3) In the above embodiment, the first exhaust gas treatment device 46 is configured to be provided within the power generating unit 8 in a longitudinal orientation with its longitudinal direction aligned with the longitudinal direction of the aircraft body. However, instead of this configuration, the first exhaust gas treatment device 46 may be configured to be provided within the power generating unit 8 in a transverse orientation with its longitudinal direction aligned with the transverse direction of the aircraft body.

[0110] (4) In the above embodiment, the exhaust gas outlet 51 of the first exhaust gas treatment device 46 and the exhaust gas supply device 54 of the second exhaust gas treatment device 47 are both configured to be formed on the outer side in the width direction of the aircraft. However, instead of this configuration, various configurations are possible, such as forming both the exhaust gas outlet 51 and the exhaust gas supply device 54 on the inner side in the width direction of the aircraft, forming the exhaust gas outlet 51 on the inner side in the width direction of the aircraft and the exhaust gas supply device 54 on the outer side in the width direction of the aircraft, or forming the exhaust gas outlet 51 on the outer side in the width direction of the aircraft and the exhaust gas supply device 54 on the inner side in the width direction of the aircraft. The exhaust gas supply device 54 of the second exhaust gas treatment device 47 may be formed on the front side of the aircraft. The communicating connection pipe 65 may be configured as a cylindrical body made of a non-deformable material instead of a flexible cylindrical body.

[0111] (5) In the above embodiment, the first exhaust gas treatment device is configured to be installed in a location on the inside of the aircraft width direction on the top of the engine. However, instead of this configuration, the first exhaust gas treatment device may be configured to be installed in a location on the outside of the aircraft width direction on the top of the engine.

[0112] (6) In the above embodiment, the first exhaust gas treatment device is connected and supported to the engine, and the second exhaust gas treatment device is connected and supported to the aircraft frame. However, instead of this configuration, the first exhaust gas treatment device and the second exhaust gas treatment device may be connected and supported to the engine, or the first exhaust gas treatment device and the second exhaust gas treatment device may be connected and supported to the aircraft frame.

[0113] (7) In the above embodiment, the second exhaust gas treatment device is configured to be supported by a support pillar for supporting the engine bonnet. However, instead of this configuration, the second exhaust gas treatment device may be configured to be supported by a dedicated support frame.

[0114] (8) In the above embodiment, the present invention is applied to a head-feeding combine harvester, but it can also be applied to a normal-type combine harvester. [Industrial Applicability]

[0115] The present invention can be applied to a combine harvester equipped with an exhaust gas treatment device for purifying engine exhaust gas. [Explanation of symbols]

[0116] 6 Grain Tank 6a Slope section 8. Power unit 14 Aircraft frame 21 Engine 22 Engine bonnet 24 Vertical support 30 Elastic support 46 No. 1 Exhaust Gas Treatment Plant 47 Second exhaust gas treatment plant 51 Exhaust gas outlet 54 Exhaust gas supply unit 65 Connecting member 92 Exhaust pipe Q1 Otoribe Q2 Groove Y1 vertical axis center

Claims

[Claim 1] a driving unit having an engine; a threshing device for performing threshing processing; A grain tank located on the side of the threshing device and behind the driving unit for storing threshed grains; an exhaust gas treatment device that treats exhaust gas from the engine, The exhaust gas treatment device includes a first exhaust gas treatment device that reduces particulate matter contained in exhaust gas from the engine, and a second exhaust gas treatment device that reduces nitrogen oxides contained in the exhaust gas after treatment by the first exhaust gas treatment device, the first exhaust gas treatment device and a main body treatment section of the second exhaust gas treatment device are housed in separate exterior casings, The combine harvester is arranged so that the second exhaust gas treatment device overlaps with the grain tank in plan and front views.

Images