CN112056079A

CN112056079A - Combine harvester

Info

Publication number: CN112056079A
Application number: CN202010960173.3A
Authority: CN
Inventors: 梶原康一; 国松翔太
Original assignee: Yanmar Power Technology Co Ltd
Current assignee: Yanmar Power Technology Co Ltd
Priority date: 2015-03-04
Filing date: 2016-03-03
Publication date: 2020-12-11
Also published as: KR20190140103A; KR20230003427A; KR20210024226A; KR102481560B1; KR102057380B1; KR102656750B1; KR102326721B1; WO2016140320A1; CN107249301A; CN107249301B; KR20170109058A; CN112056080A; KR20210136169A; KR102408297B1; KR20240051298A

Abstract

The invention provides a combine harvester. The combine harvester is provided with: a threshing device; an engine that drives the threshing device; an exhaust gas purification device including a first casing for removing particulate matter from the exhaust gas of the engine and a second casing for removing nitrogen oxide from the exhaust gas of the engine; an engine room in which the engine is built; and a grain tank for input of harvested grain; at least a second casing of an exhaust gas treatment device is disposed at a front portion of the grain tank at a position facing the threshing device side of the engine room.

Description

Combine harvester

The present application is a divisional application of an invention patent application having an application number of 2016800041920, an application date of 2016, 3 months and 3 days, and a name of "combine harvester".

Technical Field

The present invention relates to a combine harvester such as a combine harvester which collects grain from stalks planted in a field or a feed combine harvester which collects stalks for feed as feed, and more particularly to a combine harvester including an exhaust gas purification device which removes particulate matter (soot and particulates) contained in exhaust gas of a diesel engine or the like or nitrogen oxides (NOx) contained in the exhaust gas.

Background

Conventionally, the following techniques are known: in an exhaust passage of a diesel engine, a case (hereinafter, referred to as a DPF case) containing a diesel particulate filter and a case (hereinafter, referred to as an SCR case) containing a urea selective reduction catalyst are provided as an exhaust gas purification device (post-treatment device), and exhaust gas discharged from the diesel engine is purified by introducing the exhaust gas into the DPF case and the SCR case (see, for example, patent documents 1 to 3). In addition, in the prior art, the combine harvester has the following structure: utilize cutting knife device to cut off the ear of grain stalk of not reaping in with the field, utilize ear of grain stalk conveyor with it reap the ear of grain stalk and carry to thresher and thresh to collect corn in the grain case, this combine constitutes: an engine is mounted on the traveling machine body, and a DPF casing is disposed on the upper surface side of the engine in a horizontal posture, and exhausts exhaust gas from the engine toward the DPF casing. (see, for example, patent document 4).

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-74420

Patent document 2: japanese laid-open patent publication No. 2012-21505

Patent document 3: japanese patent laid-open publication No. 2012-177233

Patent document 4: japanese patent application laid-open No. 2010-209813

Disclosure of Invention

In the above-described conventional technology, in a structure in which the engine and the exhaust gas purification device (DPF casing) are disposed in the engine room so as to be close to each other, it is necessary to secure an installation space of the exhaust gas purification device (SCR casing) around the engine mounting portion, and there is a problem that the engine room volume or the volume of the exhaust gas purification device (DPF casing or SCR casing) is limited. In addition, in the structure in which the exhaust gas purification device (DPF casing or SCR casing) is supported outside the engine compartment, there is a problem that the mounting position of the urea mixing pipe, the exhaust gas purification device, or the like that connects the SCR casing to the DPF casing is limited, and the mounting structure of the exhaust gas purification device cannot be simplified. In addition, in a structure of a traveling body in which an exhaust gas purification device (DPF casing or SCR casing) is provided at a position separated from an engine like a truck, although an installation space of the exhaust gas purification device can be easily secured, there is a problem that the exhaust gas temperature in the exhaust gas purification device is easily lowered to a predetermined temperature or lower.

In addition, when the exhaust gas purification apparatus includes the urea selective reduction catalyst, it is necessary to provide a urea mixing chamber for mixing urea water with the exhaust gas in the exhaust gas purification apparatus and supply the urea water to the urea mixing chamber. Therefore, when an exhaust gas purification apparatus having a urea selective reduction catalyst is provided, it is necessary to provide not only the exhaust gas purification apparatus but also a urea water tank for storing urea water to be supplied to the urea mixing chamber, a urea water pump for supplying urea water in the urea water tank to the exhaust gas purification apparatus, and the like. Therefore, even if the installation space of the exhaust gas purification device can be secured, the installation space is not sufficient, and the installation places of the urea water tank and the urea water pump are required. Further, the urea water may freeze in a low-temperature environment, and the freezing of the urea water may not function the exhaust gas purification treatment, and may cause a reduction in purification performance due to a change in the concentration of the urea water.

Accordingly, the invention of the present application provides a combine harvester improved by studying these current situations.

In order to achieve the above object, a combine harvester according to the present invention includes: a cutting device; a threshing device; an engine that drives the harvesting device or the threshing device; an exhaust gas purification device for removing nitrogen oxides from the exhaust gas of the engine; an engine room in which the engine is built; and a grain tank into which harvested grains are fed, wherein the exhaust gas purification device is provided behind the engine room, and a urea water supply device for supplying urea water to the exhaust gas purification device is provided below the exhaust gas purification device.

In the above-described combine harvester, the exhaust gas purification device may be disposed at a position between the engine room and the grain tank in the front-rear direction, and the urea water supply device may be disposed at a position between the grain tank and the threshing device. Further, the following configuration may be adopted: a winnowing conveyor for conveying the first-class product screened by the threshing device to the grain box; and a reduction conveyor for conveying the secondary products, which are screened out by the threshing device, to a screening section of the threshing device in order to re-screen the secondary products, wherein the urea water supply device is fixed to a side surface of the threshing device and to an area between the winnowing conveyor and the reduction conveyor.

In the above-described combine harvester, the grain tank may be rotatably supported at a rear side thereof by a shaft outside the machine body, the urea water tank for storing urea water may be disposed at a rear side of the grain tank, and the fuel tank for storing fuel may be disposed at a rear side of the threshing device.

In the above-described combine harvester, the urea water tank for storing the urea water may be disposed at a lower portion of the frame of the threshing device. Further, the urea water tank for storing the urea water may be disposed inside a side cover that covers the side of the threshing device.

In the above-described combine harvester, a urea water tank for storing urea water may be disposed below the threshing device so as to overlap a fuel tank, and a water supply port of the urea water tank and a fuel supply port of the fuel tank may be provided so as to protrude outward of the threshing device.

In the above-described combine harvester, the exhaust gas purification device may be configured to include: a first casing that removes particulate matter from exhaust gas of the engine; and a second case that removes nitrogen oxides in exhaust gas of the engine, wherein the grain tank has a recess on a surface facing the engine room, and the first case and the second case are disposed in the recess of the grain tank.

In the above-described combine harvester, the first casing and the second casing may be arranged in parallel with each other in the left-right direction with the longitudinal direction of the first casing and the longitudinal direction of the second casing as the front-rear direction. In the above-described combine harvester, the exhaust inlet of the second tank and the exhaust outlet of the first tank may be connected via a urea mixing pipe, and the urea mixing pipe may be disposed between the first tank and the second tank in parallel with the first tank and the second tank, respectively.

In the above-described combine harvester, the first casing and the second casing coupled in parallel may be integrally fixed to each other by a fixing member, and the exhaust gas purifying device may be fixed by supporting the fixing member by a support frame provided upright from the traveling machine body. The exhaust gas purification device is fixed by supporting the fixing member by the support frame, the engine frame, and the upper surface of the threshing device.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the exhaust gas purification device is disposed behind the engine room, the exhaust gas purification device can be disposed at a position close to the engine, and the worker can be prevented from coming into contact with the exhaust gas purification device having a high temperature. Further, since the heat emitted from the engine room can be guided to the exhaust gas purification device, the exhaust gas purification device can be disposed in a high-temperature environment necessary for purification of the exhaust gas, and a high level of purification effect can be maintained in the exhaust gas purification device.

According to the invention of the present application, since the urea water supply device is disposed below the exhaust gas purification device, the urea water can be returned to the urea water tank via the urea water supply device without circulating the urea water after the engine is stopped. Therefore, after the engine is stopped, the urea water can be prevented from remaining in the urea water supply path or the exhaust gas purification device and crystallizing, and therefore, a decrease in purification capability of the exhaust gas purification device or deterioration of the device can be suppressed.

According to the invention of the present application, the exhaust gas purification device, the urea water supply device, and the urea water tank are disposed by effectively utilizing the space around the grain tank, thereby ensuring the capacity of the grain tank. Further, since the aqueous urea solution supply device can be disposed in the vicinity of the exhaust gas purification device, the aqueous urea solution pipe connecting the aqueous urea solution supply device and the exhaust gas purification device can be configured to have a short size, and the residual of the aqueous urea solution in the pipe can be suppressed, so that the crystallization of the aqueous urea solution and the like can be prevented in advance.

According to the invention of the present application, since the urea water supply device is disposed on the side surface of the threshing device and in the region between the winnowing conveyor and the reduction conveyor, it is not necessary to change the shape of the grain box in order to secure a space of the urea water supply device. Therefore, not only the volume of the grain box can be ensured, but also the shape of the grain box is not complicated, and the design is easy.

According to the invention of the present application, since the urea solution supply device is disposed between the exhaust gas purification device and the urea water tank, the urea water pipe from the urea water tank to the exhaust gas purification device can be configured in a short size. Further, by disposing the fuel tank and the urea water tank at the rear of the travel machine body, the supply ports of the fuel and the urea water can be easily recognized. Further, since the urea water tank is disposed near the rotation axis of the grain tank, the difference in piping distance can be reduced by opening and closing the grain tank, and therefore, the urea water pipe does not interfere with the opening and closing operation of the grain tank.

According to the invention of the present application, the urea water tank is disposed below the exhaust gas purification device and the urea water supply device, and thus the urea water remaining in the urea water pipe or the like can be returned to the urea water tank. Further, by disposing the urea water tank on the lower side, the water supply position of the urea water tank can be made lower, and the water supply operation can be easily performed.

According to the invention of the present application, the urea water tank can be compactly installed by flexibly utilizing the space around the threshing device, and the urea water pipe of the urea water tank and the urea water supply device provided on the side of the threshing device can be configured in a short size. In addition, the following configuration is possible: the urea water tank is formed to have a large capacity, and the urea water can be supplied to the urea water tank during maintenance work for the grain tank periphery, the engine periphery, or the like.

According to the invention of the present application, the urea water tank can be compactly installed by flexibly utilizing the installation space of the fuel tank. Further, the urea water tank can be supported by utilizing the support structure of the fuel tank. Further, the fuel supply unit and the urea water supply unit can be brought close to each other, thereby improving the replenishing workability.

Drawings

Fig. 1 is a left side view of a 6-row harvesting combine harvester illustrating an embodiment of the present invention.

Fig. 2 is a top view of the 6 row harvesting combine.

Fig. 3 is a right side view of the 6 row harvesting combine.

Fig. 4 is a front perspective view showing a structure in the engine room.

Fig. 5 is a perspective view showing the positional relationship between parts around the engine and the grain tank and the thresher.

Fig. 6 is an external perspective view showing the engine and the exhaust gas purification device.

Fig. 7 is a rear perspective view of the exhaust gas purifying device mounting portion.

Fig. 8 is a right side view showing a part of the threshing device.

Fig. 9 is an explanatory diagram of urea water supply.

Fig. 10 is a perspective view showing the arrangement of parts on the travel machine body of the combine harvester as the first embodiment.

Fig. 11 is a rear perspective view of the combine harvester.

Fig. 12 is a top view of the combine.

Fig. 13 is a plan view of a combine harvester as a second embodiment.

Fig. 14 is a rear perspective view of the combine harvester.

Fig. 15 is a front view of the urea water tank of the combine.

Fig. 16 is a right side view of the combine.

Fig. 17 is a perspective view showing the arrangement of parts of the combine harvester as the third embodiment.

Fig. 18 is a left side view showing the inside of the threshing device of the combine harvester.

Fig. 19 is a perspective view showing the arrangement of parts on the travel machine body of the combine harvester as the fourth embodiment.

Fig. 20 is a rear perspective view of the combine harvester.

Fig. 21 is a diagram showing a modification of the urea water tank of the combine harvester.

Fig. 22 is a perspective view showing the arrangement of parts on the travel machine body of the combine harvester as the fifth embodiment.

Fig. 23 is a front view of the fuel tank and urea water tank of the combine harvester (left side view of the combine harvester).

Fig. 24 is a front view (left side view of the combine) showing a first modification of the fuel tank and the urea water tank of the combine.

Fig. 25 is a side view showing the structures of the fuel tank and the urea water tank shown in fig. 24.

Fig. 26 is a side view showing a structure in which the fuel tank and the urea water tank shown in fig. 24 are separated from each other.

Fig. 27 is a front view (left side view of the combine) showing a second modification of the fuel tank and the urea water tank of the combine.

Fig. 28 is a side view showing the structures of the fuel tank and the urea water tank shown in fig. 27.

Fig. 29 is a front view showing a state when the urea water tank shown in fig. 27 is filled with urea water.

Fig. 30 is a plan view of a combine harvester as a sixth embodiment.

Fig. 31 is a right side view of the combine harvester of the sixth embodiment.

Fig. 32 is a perspective view showing the arrangement of the engine and the exhaust gas purification device.

Fig. 33 is a rear perspective view of the exhaust gas purifying device mounting portion.

Fig. 34 is a perspective view showing the arrangement of parts on the travel machine body.

Fig. 35 is a first modification of the arrangement of the exhaust gas purification device.

Fig. 36 shows a second modification of the arrangement of the exhaust gas purification device.

Fig. 37 is a front view showing the structure around the engine and the exhaust gas purification device.

Fig. 38 is a perspective view showing the structure around the exhaust gas purification device mounting portion.

Fig. 39 is a rear perspective view showing the structure around the exhaust gas purifying device mounting portion.

Detailed Description

< first embodiment >

A first embodiment embodying the present invention will be described below with reference to fig. 1 to 12. The overall structure of a combine harvester according to an embodiment having a diesel engine mounted thereon will be described with reference to fig. 1 to 3. In the following description, the left side when facing the traveling machine body 1 in the forward direction is simply referred to as the left side, and the right side when facing the forward direction is similarly simply referred to as the right side. As shown in fig. 1 to 3, a traveling machine body 1 supported by a pair of left and right traveling crawler belts 2 as a traveling unit is provided. At the front part of the traveling machine body 1, a 6-row cutting device 3 for cutting and taking in the corncobs is assembled as follows: the single-acting hydraulic cylinder 4 for elevation can be used to perform elevation adjustment around the cutting pivot shaft 4 a. A threshing device 5 having a feed chain 6 and a grain tank (grain tank)7 for storing grains taken out of the threshing device 5 are mounted on the traveling machine body 1 in a horizontal parallel manner. The threshing device 5 is disposed on the left side of the traveling machine body 1, and the grain tank 7 is disposed on the right side of the traveling machine body 1.

Further, the structure is: a grain discharging conveyor 8 that can be rotated by a vertical take-out conveyor 8a is provided at the rear of the travel machine body 1, and grains inside the grain tank 7 are discharged from a grain inlet 9 of the grain discharging conveyor 8 to a loading table or a container of a truck (truck). A cab 10 is provided on the right side of the harvesting device 3 and in front of the grain tank 7. The structure is as follows: a cab pivot fulcrum shaft 10a is provided at a lower front surface of the cab 10, the lower front surface of the cab 10 is pivotally supported on the travel machine body 1 via the cab pivot fulcrum shaft 10a so as to be pivotable, the cab 10 is provided so as to be movable toward the outside front side of the combine harvester, and the cab 10 is pivoted on the front side about the cab pivot fulcrum shaft 10 a.

In the cab 10 are disposed: a steering wheel 11, a driver seat 12, a main shift lever 15, an auxiliary shift lever 16, a threshing clutch lever 17 for engaging and disengaging the threshing clutch, and a reaping clutch lever 18 for engaging and disengaging the reaping clutch. A diesel engine 14 as a power source is disposed in the traveling machine body 1 below the driver seat 12. Further, in the cab 10, there are disposed: a step pedal on which the operator rides, a steering column provided for operating the steering wheel 11, and a pole provided for each of the

poles

15, 16, 17, and 18.

As shown in fig. 1, left and right track frames (track frames) 21 are disposed on the lower surface side of the traveling machine body 1. The rail frame 21 is provided with: a drive sprocket 22 that transmits power of the engine 14 to the crawler belt 2; a tension roller 23 that maintains a tension of the travel crawler 2; a plurality of track rollers (track rollers) 24 that keep the ground-contact side of the travel crawler 2 in a ground-contact state; and an intermediate roller 25 that holds the non-ground contact side of the crawler 2. The drive sprocket 22 supports the front side of the crawler 2, the tension roller 23 supports the rear side of the crawler 2, the track roller 24 supports the ground contact side of the crawler 2, and the intermediate roller 25 supports the non-ground contact side of the crawler 2.

As shown in fig. 1 and 2, the configuration is: a fuel tank 31 for storing fuel to be supplied to the engine 14 is disposed in the rear left side of the traveling machine body 1, and diesel fuel can be replenished into the fuel tank 31 from the outside of the combine on the left side of the thresher 5. That is, the fuel tank 31 is provided on the travel machine body 1 at a position below the straw discharge cutter 65 provided at the rear of the threshing device 5, and the fuel supply port 32 (see fig. 1 and 2) is provided so as to extend on the left side of the threshing device 5, so that fuel can be supplied from the outside of the combine harvester.

As shown in fig. 1 and 2, the harvesting frame 51 connected to the harvesting pivot shaft 4a of the harvesting device 3 is provided with: a push-shear type cutter device 52 for cutting off the roots of the unharvested cornstalks planted in the field. Disposed in front of the cutting frame 51 are: and ear stalk pulling devices 53 which are used for pulling up the ear stalks which are not harvested and planted in the field and correspond to 6 rows of ear stalks. Between the cornstalk pulling-up device 53 and the tip end portion (feed start end side) of the feed chain 6, there are disposed: and an ear/stem conveyor 54 for conveying the cut ear/stem cut by the cutter 52. Further, the cornstalk pulling device 53 is provided at the lower front side thereof with: dividing the reaped ear stalks into separate seedling-dividing bodies 55 corresponding to 6 rows of ear stalks. The structure is as follows: while moving in the field, the reaped stalks planted in the field are continuously reaped by the reaping apparatus 3.

Next, the structure of the threshing device 5 will be described with reference to fig. 1 and 2. As shown in fig. 1 and 2, the threshing device 5 includes: a threshing cylinder 56 for threshing the ear and stalk; a swing screen plate 57 and a winnowing fan 58 which screen the threshed material falling below the threshing cylinder 56; a treatment drum 59 for reprocessing the threshing discharge taken out from the rear part of the threshing drum 56; and a dust exhaust fan 60 that exhausts dust from the rear of the oscillating screen tray 57. The ear stalks transported from the harvesting device 3 by the ear stalk transport device 54 are received by the feed chain 6, and are input to the threshing device 5 to be threshed by the threshing cylinder 56.

As shown in fig. 1, on the lower side of the oscillating screen disc 57 are provided: a first-class product conveyor 61 for taking out the grain (first-class product) sorted by the swing sorting tray 57; and a second-class product conveyor 62 for taking out second-class products such as grains with branches. The oscillating screening disk 57 is constituted by: the feed tray 68 and the scalping screen 69 are used to perform swing screening (specific gravity screening) of the threshed grains that have leaked from the receiving net 67 placed under tension below the threshing cylinder 56. The grains dropped from the oscillating screen plate 57 are subjected to dust removal by the screen wind from the winnowing fan 58 and dropped to a first-class product conveyor 61. The grains taken out from the first-class product conveyor 61 are fed to the grain tank 7 by the winnowing conveyor 63, and the grains are collected in the grain tank 7.

As shown in fig. 1, the oscillating sorting disk 57 is configured to: grains with branches and the like are dropped from the coarse screen 69 to the secondary product conveyor 62 by the swing screening. The second grade product falling below the coarse screen 69 is winnowed by the screening fan 71, and the screening fan 71 is provided. For the second-grade product falling from the coarse screen 69, the dust and straw chips in the grain are removed by the screen wind from the screen fan 71, and the grain is caused to fall to the second-grade conveyor 62. The structure is as follows: the end portion of the second product conveyor 62 is connected in communication with the upper surface side of the feed tray 68 via the return conveyor 66, and the second product is returned to the upper surface side of the swing screen tray 57 and is rescreened.

On the other hand, as shown in fig. 1 and 2, on the rear end side (conveying end side) of the feed chain 6, there are disposed: a straw discharge chain 64 and a straw discharge cutter 65. The structure is as follows: the discharged straw (straw from which grains have been removed) received by the straw discharge chain 64 from the rear end side of the feed chain 6 is discharged in a long state to the rear of the traveling machine body 1, or is appropriately cut into a short length by a straw discharge cutter 65 provided at the rear of the threshing device 5, and then discharged to the rear lower side of the traveling machine body 1.

As shown in fig. 4 and 5, the grain box 7 includes: a cleaning device installation recess 7a formed in a shape in which a part of the left side of the front surface is cut off; a grain discharging conveyor-provided concave portion 7b formed in a groove shape in the front-rear direction on the left side of the upper surface; and a grain conveyor installation recess 7c formed in a shape having a step in the vertical direction at the center of the left side surface. A recess 7a for purifying device installation is provided on the front surface of the grain tank 7, and a space is provided behind the engine room 97 to dispose the exhaust gas purifying device 74. The grain discharging conveyor 8, the front end of which is housed in the conveyor support body, is housed in the grain discharging conveyor installation recess 7b on the upper surface of the grain box 7 along the grain discharging conveyor installation recess 7 b. The winnowing conveyor 63 is fixed to the winnowing conveyor installation concave portion 7c on the left side surface of the grain box 7 along the winnowing conveyor installation concave portion 7c, and is connected by a socket provided at the upper portion of the winnowing conveyor installation concave portion 7 c.

As shown in fig. 4 and 11, the grain discharging conveyor 8 is rotatably supported on the upper end side of a vertical take-out conveyor (vertical conveying conveyor) 8a, and a rice inlet 9 is provided on the conveying end side of the grain discharging conveyor 8. A cross conveyor 8b is disposed in a front-rear direction at the bottom of the grain tank 7, and the lower end (base end) side of the vertical take-out conveyor 8a is connected to the rear end of the cross conveyor 8 b. In addition, the bottom of the grain box 7 is provided with: the combine outer bottom plate 7d and the combine inner bottom plate (not shown) are inclined toward the cross conveyor 8b so that grains in the grain box 7 flow down toward the cross conveyor 8 b. The horizontal conveyor 8b extends in the front-rear direction at the bottom of the grain box 7, and conveys grains flowing downward along the bottom plate of the grain box 7 toward the rear vertical take-out conveyor 8 a.

The longitudinal take-out conveyor 8a is connected to the rear end of a transverse conveyor 8b protruding from the rear end surface of the grain box 7, and extends upward of the grain box 7 along the rear end surface of the grain box 7. The lower end (base end) side of the vertical take-out conveyor 8a is connected to the cross conveyor 8b, and the vertical take-out conveyor 8a is erected behind the grain box 7 by fixing the upper portion of the vertical take-out conveyor 8a to the rear end face of the grain box 7. Further, the structure is as follows: the lower end of the longitudinal extraction conveyor 8a is supported by the traveling machine body 1, whereby the grain tank 7 can be moved laterally around the axis of the longitudinal extraction conveyor 8a toward the outside of the combine harvester, and the right side surface of the threshing device 5 and the rear surface of the engine room 97 can be opened. Further, a rear cover 30 for covering the periphery of the vertical take-out conveyor 8a is detachably provided on the rear side of the grain tank 7, and a bottom cover 165 is detachably provided on the outer side surface of the combine outer bottom plate 7d of the grain tank 7.

Next, the first case 75 (diesel particulate filter, DPF) and the second case 229 (selective catalytic reduction, SCR) as the exhaust gas purification device 74, and the diesel engine 14 will be described with reference to fig. 4 to 7. The disclosed device is provided with: a first casing 75 serving as a Diesel Particulate Filter (DPF) for removing particulate matter from the exhaust gas of the diesel engine 14; and a second tank 229 functioning as a urea Selective Catalyst Reduction (SCR) system that removes nitrogen oxides from the exhaust gas of the diesel engine 14. As shown in fig. 5, the first casing 75 houses: a diesel oxidation catalyst 79, and a soot filter 80. As shown in fig. 7, the second case 229 incorporates therein: an SCR catalyst 232 for urea selective catalyst reduction, and an oxidation catalyst 233.

In addition, the first casing 75 includes: an inlet-side case 76 and an outlet-side case 77. Inside the inlet-side case 76 are disposed: generation of nitrogen dioxide (NO)₂) The diesel oxidation catalyst 79 of platinum or the like. Inside the inlet-side case 76 and the outlet-side case 77, there are disposed: a honeycomb-structured soot filter 80 for continuously oxidizing and removing the collected Particulate Matter (PM) at a relatively low temperature. Particulate Matter (PM) in the exhaust gas of the diesel engine 14 is removed by a diesel oxidation catalyst 79 and a soot filter 80 which are arranged in series in the inlet side case 76 and the outlet side case 77 along the moving direction of the exhaust gas, and carbon monoxide (CO) and Hydrocarbons (HC) in the exhaust gas are also reduced. On the other hand, in the second tank 229, there are arranged in series along the moving direction of the exhaust gas: SCR catalyst 232 and oxidation catalyst 233. The structure is as follows: nitrogen oxides (NOx) are reduced by the SCR catalyst 232 and the oxidation catalyst 233 in the second case 229.

As shown in fig. 4 to 7, the first case 75 and the second case 229 are configured such that: a long cylindrical shape extending long in the right-left direction of the machine body. The first tank 75 is provided with, on both sides (one end side and the other end side in the exhaust gas moving direction) of the cylindrical shape: a purge inlet pipe 81 for taking in the exhaust gas; and a purge outlet pipe 82 for discharging the exhaust gas. Similarly, on both sides (one end side in the exhaust gas moving direction and the other end side) of the second casing 29, there are provided: an SCR inlet pipe 236 for taking in exhaust gas; and an SCR outlet duct 237 for discharging exhaust gas.

As shown in fig. 4 to 7, at an exhaust gas outlet (exhaust manifold 117) of the diesel engine 14, there are disposed: air is forcibly fed to the supercharger 118 of the diesel engine 14. The exhaust gas of the diesel engine 14 is introduced into the first tank 75 by communicating the purge inlet pipe 81 with the exhaust gas outlet side of the supercharger 118 via the exhaust connecting pipe 119. The structure is as follows: a urea mixing pipe 239 connected to the SCR inlet pipe 236 is connected to the purge outlet pipe 82, and exhaust gas is introduced from the first tank 75 into the second tank 229 through the urea mixing pipe 239. In addition, the structure is as follows: the bellows-shaped connecting pipe 98, which is flexible and expandable, connects the exhaust gas outlet side of the supercharger 118 and the exhaust connecting pipe 119, so that the vibration of the engine 14 on the supercharger 118 side is not transmitted to the exhaust connecting pipe 119 side.

On the other hand, purified outlet pipe 82 and urea solution injection section 240 of urea mixing pipe 239 are detachably fastened to each other by bolts at the pipe flange. The structure is as follows: the inlet side case 76 and the outlet side case 77 are detachably connected by fastening a plurality of sets of thick plate-shaped intermediate flange bodies 84 with bolts, and the outlet side case 77 can be separated, thereby performing the disassembly and maintenance of the soot filter 80. Further, the structure is: the tail pipe 83 is connected to the SCR outlet pipe 237, and an exhaust gas outlet of the tail pipe 83 is opened toward the upper side of the machine body, exhaust gas of the diesel engine 14 (each cylinder) is introduced from the supercharger 118 into the first tank 75, the exhaust gas is moved from the first tank 75 to the urea mixing pipe 239, urea water in the urea water tank 174 described later is mixed with the exhaust gas, and then the exhaust gas is introduced into the second tank 229 and is released from the tail pipe 83 to the outside of the combine harvester.

With the above configuration, the soot filter 80 in the first case 75 collects Particulate Matter (PM) contained in the exhaust gas of the diesel engine 14 and utilizes nitrogen dioxide (NO)₂) The substance is continuously oxidized and removed. In addition to the removal of 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 decreases. Next, inside the urea mixing pipe 239, the urea solution is injected from the urea solution injection nozzle body of the urea solution injection unit 240 toward the exhaust gas from the diesel engine 14, and the content of nitrogen oxides (NOx) in the exhaust gas is reduced by the SCR catalyst 232 and the oxidation catalyst 233 for urea selective catalyst reduction: the exhaust gas in the second tank 229 mixed with ammonia generated by hydrolysis. The exhaust gas from the diesel engine 14 is purified in the first tank 75 and the second tank 229, and is discharged from the tail pipe 83 to the outside of the combine harvester.

Next, as shown in fig. 4 and 6, an engine room frame 91 as a body frame is provided upright on the traveling body 1 in front of the grain tank 7, and an engine room 97 is formed by the engine room frame 91. The diesel engine 14 is placed on the upper surface side of the traveling machine body 1, and the diesel engine 14 is built in the engine room 97. Cooling components such as a water-cooling radiator (not shown) and a cooling fan 115 are incorporated in the engine room 97 at the side of the diesel engine 14. The structure is as follows: the cooling fan 115 takes in outside air from the outside on the right side of the combine body toward a cooling component such as a radiator (not shown), and discharges warm air of the diesel engine 14 toward the threshing device 5 side.

Further, the structure is: the diesel engine 14 and the cooling components are surrounded on the right side, the back side, and the top side by the engine room frame 91, and cooling outside air is taken in from the outside of the right side of the engine room frame 91 into the engine room 97 by the cooling fan 115 of the diesel engine 14, while warm air after cooling the diesel engine 14 and the cooling components is discharged toward the right side of the threshing device 5 as a working unit adjacent to the engine room frame 91 (engine room 97).

The engine room frame 91 has: a left square tubular strut 92; an inverted U-shaped pillar 93 on the right side; and a square tubular lateral frame 94 whose both end sides are integrally fixed to the left and

right support columns

92, 93. One end of the square tubular lateral frame 94 is connected to the upper end of the square tubular column 92, and the other end of the square tubular lateral frame 94 is connected to and fixed to a square tubular frame 93a fixed above the inverted U-shaped column 93.

Rubber pressure-contact leg members (not shown) provided at the rear portion of the bottom surface of cab 10 are brought into contact with the upper surfaces of left and right support bases 96 of lateral frame 94 from above, and the rear portion of cab 10 is supported by support bases 96 of lateral frame 94 so as to be able to contact and separate vertically. The diesel engine 14 is disposed on the bottom surface side of the cab 10 and inside an engine room 97 formed by the engine room frame 91. As shown in fig. 4, a conveyor support 90 is provided on the upper end side of the left pillar 92, and the grain discharging conveyor 8 is supported at the storage position by the conveyor support 90.

Further, the apparatus comprises: an air cleaner 123 that supplies outside air to the diesel engine 14; and a pre-cleaner (pre) 124 that takes in outside air to the air cleaner 123. In the upper surface of the engine room 97, an air cleaner 123 is disposed on the right side of the exhaust gas purification device 74, a pre-cleaner 124 is disposed on the right front side of the grain tank 7 and above the engine room 97, and the air cleaner 123 is connected to the pre-cleaner 124 through an air supply pipe 125. The structure is as follows: the combustion air is taken from the pre-cleaner 124 into the compressor case 118a of the supercharger 118 of the diesel engine 14 via the air cleaner 123. On the right side of the rear surface of the cross frame 94 of the engine room frame 91, an air cleaner 123 is fixed so that the air cleaner 123 is positioned on the front right side of the exhaust gas purifying device 74.

As shown in fig. 4 to 6, the supercharger 118 is provided on the upper front side of the diesel engine 14, and a compressor housing 118a having a blower wheel therein is provided on the right side thereof, while a turbine housing 118b having a turbine wheel therein is provided on the left side thereof. An intake side provided at the right end of the compressor housing 118a communicates with an intake discharge side of the air cleaner 123 via the air supply pipe 120. On the other hand, the exhaust outlet pipe 99 provided at the left end of the turbine housing 118b is connected to an exhaust connecting pipe 119 via a flexible bellows-shaped exhaust introduction pipe 98, and the exhaust connecting pipe 119 is connected to an exhaust gas inlet (purification inlet pipe 81) of the exhaust gas purification device 74 as an aftertreatment device.

As shown in fig. 3 to 6, the exhaust gas purification device 74 including the first and

second cases

75 and 229, the air cleaner 123, and the pre-cleaner 124 are disposed on the rear surface of the engine room frame 91 and on the left and right sides with respect to the engine 14. That is, the air cleaner 123 and the precleaner 124 constituting the intake system are disposed on the right side of the compressor housing 118a and the exhaust gas purification device 74 constituting the exhaust system is disposed on the left side of the turbine housing 119b with respect to the supercharger 118 on the front surface of the engine 14. Therefore, the intake path and the exhaust path of the engine 14 including the supercharger 118 are disposed on the left and right sides in a distributed manner, so that the intake path and the exhaust path can be formed by short paths, and the intake path can be disposed at a position separated from the exhaust path through which high-temperature exhaust gas passes.

Next, the mounting structure and the supporting structure of the exhaust gas purifying device 74 will be described with reference to fig. 4 to 7. The exhaust gas purification device 74 is a unit in which a first casing (DPF)75 and a Second Casing (SCR)229 are connected in parallel by a casing fixing body 231. The first casing 75 is detachably fixed to the casing fixing body 231 by a plurality of fastening and connecting bands 85, and the second casing 229 is detachably fixed by a plurality of fastening and connecting bands 230. That is, the first casing 75 and the second casing 229 are arranged in parallel on the casing fixing body 231 such that both ends of each of the plurality of

fastening belts

85 and 230 are fastened and connected to the casing fixing body 231 by bolts.

The casing fixing body 231 having the first casing 75 and the second casing 229 mounted on the upper surface thereof is fixed to the support base 250, thereby supporting the exhaust gas purifying device 74 on the traveling machine body 1. As shown in fig. 4 to 7, the support table 250 is disposed: a cleaning device installation recess 7a provided on the left side (threshing device 5 side) of the front surface of the grain box 7; the exhaust gas purification device 74 is supported from the engine room 97 to the purification device installation recess 7 a. As shown in fig. 5 to 7, the support table 250 is fixed at its left edge to the right side of the frame of the threshing device 5, at its front side to the engine room frame 97, and at its right edge to the pillar frame 251 erected from the traveling machine body 1, whereby the support table 250 is supported at a position above the cleaning device installation recess 7a of the grain tank 7.

As shown in fig. 4 and 6, one end of the bridging frame 252 is fixed to the back surface of the support base 250, and the other end of the bridging frame 252 is connected to the lateral frame 94 of the engine room frame 91, whereby the front side of the support base 250 is supported by the engine room frame 91. As shown in fig. 5, the left edge of the support table 250 is connected to the right side portion of the upper surface of the threshing device 5 (threshing upper surface frame on the upper portion of the right side of the threshing machine frame) by the assembly adjustment frame 253, and the left edge of the support table 250 is supported by the right side portion of the threshing device 5. As shown in fig. 7, the right edge of the support base 250 is coupled to the upper end of the pillar frame 251 via the horizontal grid frame 254, and the right edge of the support base 250 is supported by the pillar frame 251.

As shown in fig. 4 and 5, the bridge frame 252 extends from the support base 250 toward the lateral frame 94 at a position between the air cleaner 123 and the purge inlet pipe 81. This not only ensures a space for connecting the bellows-shaped exhaust introduction pipe 98 disposed below the lateral frame 94 and the purge inlet pipe 81 of the first casing 75, but also prevents a cushion against the air cleaner 123. Further, the bridge frame 252 is disposed: including the position between the intake path of the air cleaner 123 and the exhaust path coupled to the first case 75, the influence of the heat discharged from the exhaust path on the air cleaner 123 can be reduced.

As shown in fig. 4 to 7, the grain tank 7 has a purification device installation recess 7a on a surface facing the engine room 97, and the purification device installation recess 7a of the grain tank 7 is provided with: an exhaust gas purification apparatus 74 having a first tank 75 and a second tank 229. This makes it possible to dispose the exhaust gas purification device 74 between the grain tank 7 and the engine room 97 and in a position close to the engine 14, and to prevent the worker from coming into contact with the high-temperature exhaust gas purification device 74. Further, since the heat exhausted from the engine room 97 can be guided to the exhaust gas purification device 74, the exhaust gas purification device 74 can be disposed in a high-temperature environment necessary for purification of the exhaust gas, and a high level of purification effect can be maintained in the exhaust gas purification device 74.

At this time, as shown in fig. 4 to 7, the first casing 75 and the second casing 229 are arranged in parallel so that the first casing 75 and the second casing 229 are horizontally supported by the cleaning device installation recess 7a extending from the threshing device 5 to the grain tank 7. By horizontally supporting the first case 75 and the second case 229, the exhaust gas purification device 74 can be compactly arranged at a position higher than the engine 14, and the structure can be formed so as to easily guide the high-temperature exhaust gas from the engine 14 to the exhaust gas purification device 74. Further, by disposing the exhaust gas purification device 74 at a high position, it is possible to prevent water generated by condensation or the like due to a temperature decrease when the engine 14 is stopped from remaining in the exhaust gas purification device 74.

As shown in fig. 4 to 7, the first tank 75 and the second tank 229 of the exhaust gas purification device 74 are connected in parallel by the tank fixing body 231, the exhaust inlet of the second tank 229 is connected to the exhaust outlet of the first tank 75 via the urea mixing pipe 239, and the urea mixing pipe 239 is disposed between the first and

second tanks

75, 229 in parallel with the first and

second tanks

75, 229, respectively. Thus, the first and second tanks and the urea mixing pipe can be configured as an integral unit structure, and the exhaust gas purification device 74 can be compactly installed inside the purification device installation recess 7a in front of the grain tank 7. Therefore, the installation space of the exhaust gas purification device 74 can be easily secured, the purification device installation recess 7a of the grain tank 7 can be formed in a narrow manner, and the grain storage capacity of the grain tank 7 can be secured.

The first and

second cases

75 and 229 of the exhaust gas purification device 74 are disposed in parallel on the left and right sides with the longitudinal direction of each of the first and

second cases

75 and 229 being the front-rear direction, and the first case 75 is disposed on the threshing device 5 side. By disposing the first tank 75 on the threshing device 5 side and disposing the second tank 229 on the rear side of the purifying device installation recess 7a of the grain tank 7, the second tank 229 and the urea mixing pipe 239 can be disposed so as to be covered by the grain tank 7, and the first tank 75 can be disposed at a position close to the exhaust port of the engine 14. Therefore, the exhaust path from the engine 14 to the first tank 75 can be formed with a short path, and the regeneration process in the first tank 75 can be maintained with high performance. Further, second tank 229 and urea mixing pipe 239 can be disposed in a high-temperature environment surrounded by grain tank 7 behind engine compartment 97, so that urea water can be prevented from freezing, and the purification capacity of second tank 229 can be maintained at a high level.

As shown in fig. 7 to 12, the present invention includes: a urea water tank 174 for storing urea water (urea aqueous solution for selective catalyst reduction); and an aqueous urea solution supply device 175 that supplies aqueous urea solution to the aqueous urea solution injection part 240 of the urea mixing pipe 239. Urea water supply device 175 supplies urea water in urea water tank 174 to urea water injection unit 240 of urea mixing pipe 239, and thereby sprays the urea water in the form of a mist from urea water injection valve 178 of urea water injection unit 240 into urea mixing pipe 239.

As shown in fig. 9, the urea water supply device 175 includes: a urea water pump 171 that pressure-feeds the urea aqueous solution in the urea water tank 174; and an electric motor 172 for urea water supply that drives the urea water pump 171. The urea water supply device 175 is connected to a urea water injection valve 178 of the urea water injection unit 240 via a urea water injection pipe 177, and is connected to the urea water tank 174 via a urea water supply pipe 179 and a urea water return pipe 180. Further, the apparatus comprises: 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 solution injection valve 178 is attached to the urea solution injection part 240 of the urea mixing pipe 239, and the urea solution is injected into the urea mixing pipe 239 in the form of mist from the urea solution injection valve 178. The structure is as follows: the urea water supplied into the urea mixing pipe 239 is mixed as ammonia in the exhaust gas from the first tank 75 to the second tank 229. Further, the configuration is: urea injection controller 182 is connected to a urea water temperature sensor 183 of urea water tank 174 and a urea water amount sensor 184 of urea water tank 174, and engine controller 181 and urea injection controller 182, and urea water is supplied into urea mixing pipe 239 at an appropriate timing in accordance with the operating state of diesel engine 14 and the like.

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

As shown in fig. 10 and 12, the exhaust gas purification device 74 is provided between the threshing device 5 and the grain tank 7 behind the engine room 97, and the urea water supply device 175 that supplies urea water to the exhaust gas purification device 74 is provided below the exhaust gas purification device 74. Therefore, since the exhaust gas purification device 74 and the urea water supply device 175 can be disposed behind the engine room 97, the urea water can be prevented from freezing by the heat discharged from the engine 14, and the quality degradation of the urea water can be suppressed.

As shown in fig. 10 and 12, the exhaust gas purification device 74 is disposed at a position between the engine room 97 and the grain tank 7 in the front-rear direction, and the urea water supply device 175 is disposed at a position between the grain tank 7 and the threshing device 5. The exhaust gas purification device 74 and the urea water supply device 175 are disposed by effectively utilizing the space around the grain tank 7, thereby ensuring the capacity of the grain tank 7. Further, since the exhaust gas purification device 74 and the urea solution supply device 175 can be arranged at a short distance, the urea solution pipe (urea solution injection pipe 177) connecting the exhaust gas purification device 74 and the urea solution supply device 175 can be formed in a short size.

As shown in fig. 7 and 8, the urea water supply device 175 is fixed to the right side surface (grain tank 7 side) of the thresher 5 and to a region between the winnowing conveyor 63 and the reduction conveyor 66. Thus, the urea solution supply device 175 can be disposed near the exhaust gas purification device 74, and the exhaust gas purification device 74 is positioned on the front surface of the grain tank 7 adjacent to the threshing device 5, so that the urea solution pipe (urea solution injection pipe 177) connected from the urea solution tank 174 to the urea solution injection part 240 can be formed in a short size. Further, the exhaust gas purification device 74 and the urea water supply device 175 can be disposed in: a flow path of exhaust air formed between the threshing device 5 and the grain tank 7 behind the engine room 97. Therefore, the urea water can be prevented from freezing or the like, and the SCR system can be operated in an optimum temperature environment.

In the present embodiment, as shown in fig. 7 and 8, the urea water supply device 175 is fixed to: the grain conveyer 63 is located at the front side and below the reduction conveyer 66. That is, the urea solution supply device 175 is fixed to the right side surface of the threshing device 5, and the urea solution supply device 175 is disposed: at the lower side of the reduction conveyor 66 and at a position between the winnowing fan 58 and the first-class product conveyor 61. That is, the urea water supply device 175 is disposed at a position surrounded by the grain conveyor 63 and the reduction conveyor 66 that intersect with each other, and the cover 58a that covers the right suction port of the grain fan 58.

On the other hand, the grain tank 7 is provided without buffering with respect to the winnowing conveyor 63 and the reduction conveyor 66. Therefore, by disposing the urea water supply device 175 in the area surrounded by the winnowing conveyor 63 and the reduction conveyor 66, the urea water supply device 175 can be fixed to the side surface of the threshing device 5 without cushioning against the grain tank 7, and the volume of the grain tank 7 can be secured without changing the shape of the grain tank 7.

Next, a modified example of the installation position of the urea water supply device 175 disposed in the region between the grain conveyor 63 and the reduction conveyor 66 will be described with reference to fig. 8. As shown in fig. 8, the urea-water supply device 175 may be provided at a position on the front side of the winnowing conveyor 63 and below the reduction conveyor 66, and may be disposed at a height position on the lower side of the exhaust gas purification device 74 by being disposed at a height position equivalent to the discharge port of the winnowing conveyor 63 as shown by an imaginary line.

As shown by the imaginary line in fig. 8, the urea-water supply device 175 may be provided on either the upper side or the lower side of the reduction conveyor 66 on the rear side of the grain conveyor 63. In addition, in the case where the grain conveyer 63 and the reduction conveyer 66 are provided in parallel without intersecting each other on the right side surface of the threshing device 5, the urea water supply device 175 may be provided between the grain conveyer 63 and the reduction conveyer 66.

Next, an installation structure of the urea water tank 174 will be described with reference to fig. 10 to 12. As shown in fig. 10 to 12, the urea water tank 174 is disposed behind the grain tank 7, and the fuel tank 31 is disposed behind the threshing device. The fuel supply port 32 of the fuel tank 31 is provided to project to the left, while the water supply port 174a of the urea water tank 174 is provided to project to the right. Specifically, the urea water tank 174 is provided with a water supply port 174a extending rearward (diagonally rearward and rightward) from the outside of the combine harvester, and the urea water tank 174 is disposed between the vertical take-out conveyor 8a and the rear cover 30 so as to be disposed in the vertical direction. The structure is as follows: the water supply port 174a protrudes from an opening (not shown) of the rear cover 30, and the water supply port に 174a can be operated from the outside of the combine harvester.

As shown in fig. 10 to 12, the urea water tank 174 is disposed vertically with its longitudinal direction being the vertical direction, and is fixed to the lower side of the right edge (combine outer edge) of the rear end surface of the grain tank 7. Further, since the water supply port 174a is projected toward the right side opposite to the fuel fill port 32, and the fuel fill port 32 is directed toward the left side of the traveling machine body 1, it is possible to prevent erroneous determination of the fuel fill port 32 and the water supply port 174a when the fuel fill operation to the fuel tank 31 or the water supply operation to the urea water tank 174 is performed. Further, since the water supply port 174a protrudes obliquely rearward, the arrangement amount of the water supply hose from the oil fill port 32 to the water supply port 174a can be reduced, and the oil supply operation and the water supply operation can be simultaneously performed.

As shown in fig. 10 and 11, the urea water tank 174 is disposed around the vertical take-out conveyor (vertical conveying conveyor) 8a located behind the grain tank 7 so as to be vertically disposed. The urea water tank 174 is disposed inside the rear cover 30, and the urea water tank 174 is disposed in parallel with the vertical take-out conveyor 8 a. As shown in fig. 10 and 12, the urea water tank 174 is connected to a urea water supply device 175 disposed on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 disposed between the thresher 5 and the grain tank 7. That is, the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank 174 can be disposed by flexibly utilizing the space around the grain tank 7, and therefore, the capacity of the grain tank 7 can be secured.

As shown in fig. 10 and 12, the exhaust gas purification device 74 is disposed around the front of the grain tank 7, the urea water supply device 175 is disposed on the side of the grain tank 7, and the urea water tank 174 is disposed behind the grain tank 7. That is, since the urea solution supply device 175 is disposed between the exhaust gas purification device 74 and the urea solution tank 174, the

urea solution pipes

177, 179, and 180 extending from the urea solution tank 174 to the exhaust gas purification device 74 can be formed in a short size.

As shown in fig. 12, the grain box 7 is configured to: the rear part of the grain tank 7 is supported on a longitudinal take-out conveyor 8a so as to be capable of moving laterally around the axis of the longitudinal take-out conveyor 8a toward the outside of the combine. The grain tank 7 is rotated around the vertical direction toward the outside of the combine harvester about the vertical rotation axis of the longitudinal take-out conveyor 8a, so that 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 provided around the vertical take-out conveyor 8a, the connection portions with the urea water supply pipe 179 and the urea water return pipe 180 can be disposed near the pivot of the grain tank 7. The urea water supply pipe 179 and the urea water return pipe 180 are disposed such that: roundabout from the left side of the grain bin 7 to the back. Therefore, when the grain tank 7 is opened, the piping distance from the urea water tank 174 to the urea water supply device 175 is shortened as compared with when the grain tank 7 is stored, and the difference in piping distance can be reduced by opening and closing the grain tank 7.

Further, when the grain tank 7 is opened by the lateral movement, the exhaust gas purification device 74 and the urea water supply device 175 behind the engine room 97 can be easily operated, and when the grain tank 7 is stored, the exhaust gas purification device 74 and the urea water supply device 175 cannot be operated. Therefore, when the grain tank 7 is stored, the grain tank 7 cannot be brought into contact with the exhaust gas purification device 74 or the like that becomes high in temperature during operation, so that the safety of the operator can be ensured, and the grain tank 7 is opened to facilitate the operation of the exhaust gas purification device 74 and the urea water supply device 175 during various operations such as maintenance.

< second embodiment >

Next, a second embodiment embodying the present invention will be described with reference to fig. 13 to 16. In the combine harvester of the present embodiment, unlike the first embodiment, the urea water tank 174 on the rear side of the grain tank 7 is disposed below the grain tank 7 so as to be horizontally disposed. Since the other configurations are the same as those of the combine harvester of the first embodiment, detailed description thereof will be omitted, and the configuration of the urea water tank 174 will be described below.

As shown in fig. 13, in the combine harvester of the present embodiment, the exhaust gas purification device 74 is disposed around the front of the grain tank 7, the urea water supply device 175 is disposed on the side of the grain tank 7, and the urea water tank 174 is disposed on the rear of the grain tank 7. Further, the fuel tank 31 and the urea water tank 174 are disposed on the left and right sides in a distributed manner behind the traveling machine body 1, and thus the fuel supply port 32 and the urea water supply port 174a are configured to be easily recognized.

As shown in fig. 13 to 15, the urea water tank 174 is fixed to the bottom plate of the grain tank 7 so as to be arranged in the horizontal direction, and the rear end portion thereof protrudes rearward from the grain tank 7. That is, the rear end portion of the urea water tank 174 is disposed in the vicinity of the connecting portion between the vertical take-out conveyor 8a and the cross conveyor 8 b. The rear end portion of the urea water tank 174 is connected to the urea water supply device 175 disposed on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 disposed between the thresher 5 and the grain tank 7.

As shown in fig. 14 and 15, the case support 173 is provided on the outer surface of the combine outer bottom plate 7d of the grain tank 7, and the urea water tank 174 is supported on the outer surface of the combine outer bottom plate 7d of the grain tank 7 via the case support 173. The bottom cover 165 is detachably provided on the outer surface of the combine outer bottom plate 7d of the grain tank 7, and the urea water tank 174 is disposed inside the combine of the bottom cover 165. On the right side surface of the urea water tank 174, a water supply port 174a is disposed so as to face the right side (outside of the combine). At this time, the opening portion is provided in the rear cover 30, and the water supply port 174a of the urea water tank 174 is provided to protrude toward the outside of the combine harvester, whereby the water supply work can be easily performed from the outside of the combine harvester.

As shown in fig. 13, the rear end portion of the urea water tank 174 connected to the urea water supply pipe 179 and the urea water return pipe 180 is disposed in the vicinity of the pivot of the grain tank 7. The rear end portion of the urea water tank 174 is connected to a urea water supply device 175 disposed on the left side of the grain tank 7 via a urea water supply pipe 179 and a urea water return pipe 180 disposed between the thresher 5 and the grain tank 7. Therefore, when the grain tank 7 is opened, the piping distance from the urea water tank 174 to the urea water supply device 175 is shortened as compared with when the grain tank 7 is stored, 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 between the threshing device 5 and the grain tank 7 and at a height lower than the exhaust gas purification device 74. Further, the urea water supply device 175 is offset in the front-rear direction (or the left-right direction) at a position higher than the urea water tank 174. That is, the urea solution supply device 175 is fixed at a position higher than the urea solution tank 174 and lower than the urea solution injection valve 178.

By disposing the urea solution injection valve 178 at a position higher than the urea solution supply device 175, the remaining urea solution can be returned to the urea solution supply device 175 due to the difference in level between the urea solution supply device 175 and the urea solution injection valve 178 after the stop of the injection of the urea solution. Similarly, by disposing the urea solution supply device 175 at a position higher than the urea solution tank 174, the remaining urea solution can be returned toward the urea solution tank 174 by the difference in level between the urea solution tank 174 and the urea solution supply device 175 after the injection of the urea solution is stopped. Therefore, as shown in fig. 16, by disposing the urea water supply device 175 at a height position between the exhaust gas purification device 74 and the urea water tank 174, the urea water can be returned toward the urea water tank 174 without circulating the urea water by the urea water supply device 175 after the engine is stopped, and the urea water return pipe 180 can be omitted.

< third embodiment >

Next, a third embodiment embodying the present invention will be described with reference to fig. 17 and 18. In the combine harvester of the present embodiment, unlike the first and second embodiments, the urea water tank 174 is disposed in the lower space of the thresher 5. Since the other configurations are the same as those of the combine harvester of the first and second embodiments, detailed description thereof will be omitted, and the configuration of the urea water tank 174 will be described below.

As shown in fig. 17 and 18, a urea water tank 174 is disposed at a lower portion of the thresher frame 36 constituting the frame of the threshing device 5. The urea water tank 174 can be compactly arranged by utilizing the space below the thresher frame 36, and the configuration can be such that: the urea water tank 174 is formed to have a large capacity, and the urea water can be supplied to the urea water tank 174 during maintenance work for the periphery of the grain tank 7 or the periphery of the engine 14.

As shown in fig. 17 and 18, the urea water supply device 175 can be disposed on the right side surface (grain tank 7 side) of the threshing device 5, and the piping paths (urea water supply pipe 179 and urea water return pipe 180) connecting the urea water tank 174 and the urea water supply device 175 can be formed in a short size. Therefore, the piping path from the exhaust gas purification device 74 to the urea water tank 174 can be shortened, and the urea water can be smoothly pressure-fed to the

pipes

177, 179, and 180, and the quality of the urea water can be prevented from being deteriorated by recrystallization, freezing, or the like. Since the exhaust gas purification device 74 is disposed between the threshing device 5 and the grain tank 7, the exhaust gas purification device 74, the urea water supply device 175, and the urea water tank 174 can be compactly disposed by utilizing the space around the threshing device 5, and the maintenance and assembly of the SCR system can be improved.

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 the urea aqueous solution is stopped, the remaining urea aqueous solution can be returned toward the urea aqueous solution tank 174 by the difference in level between the urea aqueous solution tank 174 and the urea aqueous solution supply device 175. Therefore, after the engine is stopped, the urea aqueous solution can be returned to the urea aqueous solution tank 174 without circulating the urea aqueous solution by the urea aqueous solution supply device 175, and the urea aqueous solution return pipe 180 can be omitted.

As shown in fig. 17 and 18, in the present embodiment, a urea water tank 174 is disposed on the lower surface side of the winnowing drum 37 in the lower portion of the thresher frame 36. That is, by providing the urea water tank 174 at a position between the grain raising fan 58 and the first-class product conveyor 61, the urea water tank 174 can be disposed below the urea water supply device 175 and at a position offset in the left-right direction.

As shown in fig. 17 and 18, the urea solution supply pipe 179 and the urea solution return pipe 180 connected to the urea solution tank 174 can be arranged in a short size: the threshing device 5 has a right side surface extending in the vertical direction and a lower side of the thresher frame 36 extending in the horizontal direction. Further, the urea water tank 174 can be disposed: near the valley fan 58, which directs heat expelled from the engine 14; by using the heat discharged from the engine 14, freezing and recrystallization of the urea water can be prevented.

Next, a modified example of the installation position of the urea water tank 174 disposed below the thresher frame 36 will be described with reference to fig. 18. As shown by the phantom lines in fig. 18, the urea water tank 174 may be provided on the lower surface side of the first-grade cylinder 38 or the second-grade cylinder 39. That is, the urea water tank 174 may be disposed at a position between the first-class product conveyor 61 and the sifting fan 71, or the urea water tank 174 may be disposed at a position behind the second-class product conveyor 62. This allows the urea water tank 174 to be compactly installed by flexibly utilizing the space below the thresher frame 36.

< fourth embodiment >

Next, a fourth embodiment embodying the present invention will be described with reference to fig. 19 to 21. In the combine harvester of the present embodiment, unlike the third embodiment, the urea water tank 174 is disposed in a space lateral to the threshing device 5. Since the other configurations are the same as those of the combine harvester of the third embodiment, detailed description thereof will be omitted, and the configuration of the urea water tank 174 will be described below.

As shown in fig. 19 and 20, a urea water tank 174 for storing urea water is disposed inside the side cover 41 covering the left side of the threshing device 5. The urea water tank 174 can be compactly arranged by utilizing the space inside the side cover 41, and can be configured in a short size: piping paths (urea water supply pipe 179 and urea water return pipe 180) connected to the urea water supply device 175 disposed on the right side surface (grain tank 7 side) of the threshing device 5.

As shown in fig. 19 and 20, the urea water tank 174 is disposed on the left side of the fuel tank 31 inside the side cover 41. The urea water tank 174 is formed in an L shape covering the rear side from the lower side of the left side surface of the fuel tank 31. The urea water tank 174 is constituted by: the lower side and the rear side of the fuel filler 32 protruding outward (leftward) of the combine harvester from above the left side surface of the fuel tank 31 are surrounded.

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 a rear portion thereof is provided so as to protrude upward. Further, a portion of the urea water tank 174 projecting upward in the rear is provided with a water supply port 174a projecting outward (leftward) of the combine. By configuring the urea water tank 174 in this way, the urea water tank 174 can be compactly installed by utilizing the installation space of the fuel tank 31, and the fuel supply port (fuel supply unit) 32 and the water supply port (urea water supply unit) 174a can be disposed close to each other, thereby improving the replenishing workability.

In the present embodiment, as in the modification shown in fig. 21, the urea water tank 174 and the side cover may be integrally formed. In the modification shown in fig. 21, the urea water tank 174 is provided with a tank 174c for storing urea water at a rear side (fuel tank 31 side) of a side cover portion 174b that covers the entire left side surface of the fuel tank 31, and a water supply port 174a communicating with the tank 174c is provided at a front side of the side cover portion 174 b. An opening 174d is provided in a non-disposed region of the box portion 174c of the side cover portion 174b, so that the filler opening 32 of the fuel tank 31 is inserted through the opening 174 d.

At this time, the connection portions between tank 174c and urea solution supply pipe 179 and urea solution return pipe 180 are: the side cover integrated urea water tank 174 can be removed by a structure that can be attached and detached by a quick coupler (quick coupler) or the like. Accordingly, the removal of the urea water tank 174 facilitates maintenance, cleaning, and other operations around the fuel tank 31, and the removal of the urea water tank 174 enables storage, thereby allowing management of the urea water in an optimum temperature environment.

< fifth embodiment >

Next, a fifth embodiment embodying the present invention will be described with reference to fig. 22 to 29. In the combine harvester of the present embodiment, unlike the third embodiment, the urea water tank 174 behind the grain tank 7 is disposed so as to overlap the fuel tank 31. Since the other configurations are the same as those of the combine harvester of the third embodiment, detailed description thereof will be omitted, and the configuration of the urea water tank 174 will be described below.

As shown in fig. 22 and 23, the urea water tank 174 is disposed below the thresher 5 so as to overlap the fuel tank 31, and the water supply port 174a of the urea water tank 174 and the oil supply port 32 of the fuel tank 31 are provided as follows: projects outwardly of the combine harvester towards the threshing device 5. Accordingly, the supply ports (the fuel supply port 32 and the water supply port 174a) of the fuel tank 31 and the urea water tank 174 can be disposed at positions close to each other, and thus the burden of the fuel supply and the water supply operation can be reduced.

As shown in fig. 22 and 23, a urea water tank 174 for storing urea water is disposed behind the threshing device 5 and below the threshing machine frame 36 (second-half tub 39) and the swinging sieve tray 57 constituting the housing of the threshing device 5 so as to overlap the fuel tank 31. Further, the urea water tank 174 and the fuel tank 31 are disposed so as to overlap each other in the vertical direction inside the side cover 41 covering the left side of the threshing device 5, and the oil supply port 32 and the water supply port 174a are disposed so as to protrude further outside the combine harvester than the opening of the side cover 41. Thus, the urea water tank 174 can be compactly disposed by utilizing the space behind the threshing device 5, and the piping paths (the urea water supply pipe 179 and the urea water return pipe 180) connected to the urea water supply device 175 disposed on the right side surface (the grain tank 7 side) of the threshing device 5 can be formed in a short size.

As shown in fig. 22 and 23, the upper side of the fuel tank 31 is tapered (a shape in which the front-rear width is reduced upward), and the urea water tank 174 is formed in a substantially inverted U shape. The urea water tank 174 is formed in a shape corresponding to the upper surface of the fuel tank 31, so that the upper surface of the fuel tank 31 is covered with the lower surface of the urea water tank 174, and the urea water tank 174 is disposed on the fuel tank 31. Further, the urea water tank 174 is fixed to the fuel tank 31 by mounting the urea water tank 174 on the fuel tank 31 so as to sandwich the fuel tank 31 in the front-rear direction.

The urea water tank 174 is detachably mounted to the fuel tank 31. In this case, the following configuration may be adopted: the urea water tank 174 may be attached and detached by sliding the urea water tank 174 in the left-right direction with respect to the fuel tank 31, or the urea water tank 174 may be fitted and detached in the up-down direction with respect to the fuel tank 31. At this time, the connection portions between the urea water tank 174 and the urea water supply pipe 179 and the urea water return pipe 180 are formed as follows: the structure can be attached and detached by a quick-attaching head or the like. By configuring urea water tank 174 to be separable from fuel tank 31 in this manner, not only can water be easily supplied by replacing urea water tank 174, but also urea water tank 174 can be removed and stored after the completion of the work, and thus deterioration in the quality of the urea water can be prevented.

Next, a first modification of the present embodiment will be described below with reference to fig. 24 to 26. In the present modification, as shown in fig. 24 to 26, the urea water tank 174 is disposed below the fuel tank 31, and the urea water tank 174 is disposed so as to be surrounded by the fuel tank. Since the fuel tank 31 surrounds the urea water tank 174 and the fuel tank 31 functions as a heat insulating layer, the warm keeping effect in the urea water tank 174 can be improved, and: deterioration of the urea water stored in the urea water tank 174.

In the first modification, as shown in fig. 25 and 26, a notch 31a is provided below the left side surface (the side surface on which the fuel fill inlet 32 is provided) of the fuel tank 31, and the urea water tank 174 is fitted into the notch 31 a. The urea water tank 174 has a shape matching the notch portion 31a of the fuel tank 31, and the urea water tank 174 is disposed on the lower left side of the fuel tank 31, and the upper surface and the right surface of the urea water tank 174 are covered by the notch portion 31a of the fuel tank 31.

As shown in fig. 25, the fuel tank 31 is fixed to the travel machine body 1 by a tank support body (support belt) 33. At this time, the fuel tank 31 is fixed by the tank support body 33 at a position overlapping the storage position of the urea water tank 174 (the formation position of the notch portion 31 a), and thereby the urea water tank 174 can be supported and fixed to the travel machine body 1 by the tank support body 33. Further, since the housing support member 33 is provided so that the housing support member 33 is caught by the left end portion of the urea water tank 174, the urea water tank 174 can be separated from the fuel tank 31 without detaching the housing support member 33.

Next, a second modification of the present embodiment will be described below with reference to fig. 27 to 29. In the present modification, as shown in fig. 27 to 29, the urea water tank 174 is disposed below the fuel tank 31, and the urea water tank 174 is disposed so as to be surrounded by the fuel tank, and the urea water tank 174 is formed such that: has a shape of a convex portion 174x protruding upward from the water supply port 174 a. By providing the convex portion 174x extending to a position above the water supply port 174a, a space not filled with urea water can be secured in a part of the convex portion 174 x. Therefore, even when the urea water in urea water tank 174 freezes, the volume of the urea water in urea water tank 174 can be prevented from exceeding the volume of urea water tank 174, and damage to urea water tank 174 can be prevented.

In the second modification, as shown in fig. 27 to 29, the left end portion of the urea water tank 174 is formed as follows: a shape protruding outward (leftward) of the combine harvester from the left end of the fuel tank 31. That is, when the urea water tank 174 is fitted to the notch portion 31a of the fuel tank 31, the left side surface of the urea water tank 174 is positioned: to the left of the left side surface of the fuel tank 31. Further, at the left end portion of urea water tank 174, convex portion 174x protruding to a position above water supply port 174a is provided: the ventilation device 174y is provided on the upper surface of the convex portion 174x at a position offset from the fuel fill inlet 32 of the fuel tank 31, and is configured such that: the outside air can be taken in.

As shown in fig. 28 and 29, the following are formed: with the configuration having the ventilator 174y at a position higher than the water supply port 174a, even if the urea water is supplied to the urea water tank 174, the convex portion 174x does not become a state filled with water, but becomes: the upper portion of the convex portion 174x is always filled with air by the ventilation device 174 y. Therefore, even when the urea water in urea water tank 174 freezes, it is possible to accommodate in the space above convex portion 174 x: the volume of the frozen urea solution increases so as not to exceed the volume of the urea water tank 174, and therefore, damage to the urea water tank 174 and the like can be prevented.

< sixth embodiment >

Next, a sixth embodiment embodying the present invention will be described with reference to fig. 30 to 34. In the combine harvester of the present embodiment, unlike the previous embodiments, the urea water tank 174 is disposed between the front surface of the grain tank 7 and the rear surface of the engine room 97 and below the exhaust gas purification device 74. Since the other configurations are the same as those of the combine harvester of the previous embodiments, detailed description thereof will be omitted, and the configuration of the urea water tank 174 will be described below.

As shown in fig. 30 to 34, the urea water tank 174 is disposed between the front surface of the grain tank 7 and the rear surface of the engine room 97, and below the exhaust gas purification device 74. The urea water tank 174 is constituted by: the water supply port 174a provided above the tank is disposed so as to face the outside (right side) of the combine, and the urea aqueous solution can be replenished into the urea water tank 174 from the outside of the combine between the grain tank 7 and the engine room 97. The urea water tank 174 is disposed on the right side of the threshing device 5, and is surrounded by the engine room frame 91, the right side surface of the threshing device 5, and the front surface of the grain tank 7. Thus, the urea water tank 174 is disposed: the location where heated air having passed through engine compartment 97 is guided can maintain urea water tank 174 at an appropriate temperature and prevent the stored urea water from freezing. Further, since the fuel tank 31 and the urea water tank 174 are disposed on the left and right sides of the traveling machine body 1 such that the water supply port 174a projects toward the left side of the traveling machine body 1 and toward the right side opposite to the fuel fill port 32, it is possible to prevent erroneous determination of the fuel fill port 32 and the water supply port 174a when a fuel fill operation toward the fuel tank 31 or a water supply operation toward the urea water tank 174 is performed.

As shown in fig. 33 and 34, the urea water supply device 175 is disposed between the threshing device 5 and the grain tank 7 and at a height lower than the exhaust gas purification device 74. Further, the urea water supply device 175 is disposed offset in the front-rear direction (or the left-right direction) at a position higher than the urea water tank 174. That is, the urea solution supply device 175 is fixed to: a position higher than the urea water tank 174 and a position lower than the urea water injection valve 178.

Therefore, after the injection of the urea aqueous solution is stopped, the urea aqueous solution remaining in the urea aqueous solution injection pipe 177 and the like can be returned toward the urea aqueous solution supply device 175 by the difference in level between the urea aqueous solution supply device 175 and the urea aqueous solution injection valve 178. Similarly, after the injection of the urea solution is stopped, the urea solution remaining in the urea solution supply device 175, the urea solution supply pipe 179, the urea solution return pipe 180, and the like can be returned toward the urea solution tank 174 by the difference in level between the urea solution tank 174 and the urea solution supply device 175. Further, since the urea water tank 174 and the urea water supply device 175 are arranged offset in the horizontal direction, maintenance work such as replacement of a filter member of the urea water supply device 175 located at a position higher than the urea water tank 174 is facilitated.

As shown in fig. 34, the grain box 7 includes: a cleaning device installation recess 7a formed in a shape in which a part of the left side of the front surface is cut off; a concave part 7b for setting the grain discharging conveyer, which is formed into a groove shape in the front-back direction on the left side of the upper surface; and a grain conveyor installation recess 7c formed in a shape having a step in the vertical direction at the center of the left side surface. A recess 7a for purifying device installation is provided on the front surface of the grain tank 7, and a space is provided behind the engine room 97, and the exhaust gas purifying device 74 and the urea water tank 174 are disposed. The grain discharging conveyor on the upper surface of the grain box 7 is provided with a concave part 7b, and along the grain discharging conveyor, the concave part 7b is stored with: a grain discharging conveyor 8 having a front end housed in the conveyor support body. The winnowing conveyor 63 is fixed to the winnowing conveyor installation concave portion 7c on the left side surface of the grain box 7 along the winnowing conveyor installation concave portion 7c, and is connected by a socket provided on the upper portion of the winnowing conveyor installation concave portion 7 c.

The grain tank 7 is constituted: the rear part of the grain tank 7 is supported on a longitudinal take-out conveyor 8a so as to be capable of moving laterally around the axis of the longitudinal take-out conveyor 8a toward the outside of the combine. The right side surface of the threshing device 5 and the rear surface of the engine room 97 can be opened by rotating the grain tank 7 around the vertical rotation axis of the longitudinal take-out conveyor 8a toward the outside of the combine harvester around the vertical direction. Therefore, when the grain tank 7 is opened by the lateral movement, the operator can easily operate the SCR system by the exhaust gas purification device 74, the urea water tank 174, and the urea water supply device 175 in the rear of the engine room 97, and when the grain tank 7 is stored, the SCR system cannot be operated. Therefore, the operator cannot come into contact with the exhaust gas purification device 74, the urea water tank 174, and the urea water supply device 175, which are at a high temperature during operation, and thus can easily operate the SCR system during various operations such as replenishment of urea water and maintenance while ensuring safety.

Fig. 35 is an explanatory diagram of a first modification of the mounting structure of the exhaust gas purifying device 74 (the first tank 75 or the second tank 229). In the above-described embodiment shown in fig. 4 and the like, the first casing 75 in the exhaust gas purification device 74 is disposed on the threshing device 5 side, but in the first modification shown in fig. 35, the first casing 75 and the second casing 229 connected in parallel are supported so as to be adjacent to each other in the left-right direction by the casing fixing body 231, and the second casing is disposed on the threshing device 5 side. Thus, the first casing 75, the second casing 229, and the urea mixing pipe 239, which are long cylindrical, are supported in the front-rear direction, the tail pipe 83 is disposed behind the second casing 229 on the right side of the threshing device 5, and the tail pipe 83 is connected to the SCR outlet pipe 237.

As shown in fig. 35, in the first modification, the first casing 75 and the second casing 229 of the exhaust gas purification device 74 are arranged side by side with the longitudinal direction of the first casing 75 and the second casing 229 being the front-rear direction, and the second casing 229 is disposed on the threshing device 5 side. That is, in the first modification, the second casing 229 is disposed on the threshing device 5 side, and the first casing 75 is disposed on the back side (the right back side) of the purifying device installation recess 7a of the grain tank 7, so that the first casing 75 can be disposed so as to be surrounded by the grain tank 7 and the second casing 229. Therefore, the first casing 75 can be disposed in a high-temperature environment by the high-temperature heat discharged from the engine room 97, and the regeneration process in the first casing 75 can be maintained with high performance. Further, the route from the SCR outlet pipe (exhaust outlet) 237 of the second casing 229 to the tail pipe 83 disposed on the right side of the threshing device 5 can be shortened, and the SCR outlet pipe 237 can be easily connected to the tail pipe 83.

Fig. 36 is an explanatory diagram of a second modification of the mounting structure of the exhaust gas purifying device 74 (the first tank 75 or the second tank 229). In the above-described embodiment shown in fig. 4 and the like, the first and second

cylindrical tanks

75 and 229 that are long in the front-rear direction are arranged in the left-right direction, but in the second modification shown in fig. 36, the first and

second tanks

75 and 229 that are connected in parallel are supported by the tank fixing body 231 so as to be adjacent in the front-rear direction, and the urea mixing pipe 239 is arranged between the first and second

cylindrical tanks

75 and 229 that are long in the left-right direction. At this time, the first case 75 is disposed on the front side of the second case 229 so as to be on the engine 14 side. The second case 229 is disposed so that the SCR outlet pipe (exhaust outlet) 237 is on the left side, and the tail pipe 83 is disposed behind the second case 229 and the tail pipe 83 is connected to the SCR outlet pipe 237 on the right side of the thresher 5.

As shown in fig. 36, in the second modification, the first tank 75 and the second tank 229 of the exhaust gas purification device 74 are arranged in parallel in the front-rear direction with the longitudinal direction of each of the first tank 75 and the second tank 229 being the left-right direction, and the first tank 75 is disposed on the engine room 97 side. That is, in the second modification, the first casing 75 is disposed on the engine 14 side, and the second casing 229 is disposed on the grain tank 7 side.

In the second modification example based on the above configuration, the first tank 75, the second tank 229, and the urea mixing pipe 239 can be compactly provided along the front surface of the grain tank 7, and the tail pipe 83 on the right side of the threshing device 5 can be easily connected to the SCR outlet pipe (exhaust outlet) 237 of the second tank 229. Therefore, the first casing 75 can be disposed in a high-temperature environment by the high-temperature heat discharged from the engine room 97, and the regeneration process in the first casing 75 can be maintained with high performance. Further, the exhaust path between the engine 14 and the tail pipe 83 can be formed in a short size, and the temperature of the exhaust gas in the exhaust path can be maintained at a high temperature necessary for purification of the exhaust gas in the exhaust gas purification device 74.

In the second modification, as shown in fig. 36, the following configuration is adopted: the purge inlet pipe 81 is provided on the right end side of the first tank 75, the purge outlet pipe 82 is provided on the left end side of the first tank 75, the SCR inlet pipe 236 is provided on the right end side of the second tank 229, and the SCR outlet pipe 237 is provided on the left end side of the second tank 229. Further, a cylindrical urea mixing pipe 239 extending in parallel to the left and right is provided above the

respective tanks

75, 229 between the first tank 75 and the second tank 229, which are long in the left and right direction, and cylindrical. In the present modification, the following configuration may be adopted: by providing the purge inlet pipe 81 on the left end side of the first tank 75, the purge outlet pipe 82 on the right end side of the first tank 75, the SCR inlet pipe 236 on the left end side of the second tank 229, and the SCR outlet pipe 237 on the right end side of the second tank 229, the connection of the purge inlet pipe 81 from the engine 14 to the first tank 75 can be formed in a short size.

In addition to the structure of the above embodiment, in order to weaken: the heat insulating member may be disposed on the outer periphery of the exhaust gas purification device 74, due to the influence of the heat emitted from the exhaust gas purification device 74 serving as a heat source on surrounding components. As shown in fig. 37, the upper surface and the left side surface (the threshing device 5 side) of the exhaust gas purification device 74 are covered with a purification device cover 261 that is a heat insulating plate, thereby insulating heat from the exhaust gas purification device 74 to reduce the influence of heat on the threshing device 5 side and suppressing a decrease in the temperature around the exhaust gas purification device 74. As shown in fig. 38, the purifying device cover 261 is provided with a plurality of holes in its side surface portion, so that heated air can be prevented from being retained around the exhaust gas purifying device 74, and the grain tank 7 can be prevented from being excessively heated by the exhaust gas purifying device 74.

As shown in fig. 37 and 38, a locking pin fixing frame 160 is provided to extend from the upper right side of the frame of the threshing device 5, and a locking pin 161 that fixedly supports the grain tank 7 is fixed to the upper end of the locking pin fixing frame 160. When the lock arm 162 is attached to the front surface of the grain tank 7 and the grain tank 7 is stored in the storage position of the travel machine body 1, the lock arm 162 engages with the lock pin 161. Further, the structure is: an unlocking lever (not shown) is attached to the front surface of the grain tank 7, and is connected to the lock arm 162 by a connecting and engaging lever 163, and the lock arm 162 can be disengaged from the lock pin 161 by operating the unlocking lever. The structure is as follows: the grain tank 7 is supported at the rear on the longitudinal take-out conveyor 8a, and the grain tank 7 is moved laterally around the axis of the longitudinal take-out conveyor 8a toward the outside of the combine harvester by the disengaging operation of the lock release lever with respect to the lock arm 162, whereby the right side surface of the threshing device 5 and the rear surface of the engine room 97 can be opened.

As shown in fig. 37 and 38, the following structure is possible: the cleaning device cover 261 is supported by the lock pin fixing frame 160, and the left side surface of the grain tank 7 is covered by the heat insulator 260, thereby insulating the periphery of the exhaust gas cleaning device 74. That is, the heat from the exhaust gas purifying device 74 is insulated by covering a part of the right side surface and the upper surface of the exhaust gas purifying device 74 with the heat insulator 260 and covering the remaining part of the left side surface and the upper surface of the exhaust gas purifying device 74 with the purifying device cover 261. Therefore, it is possible to suppress: the influence of the heat of the exhaust gas purification device 74 on surrounding components can be utilized to prevent an operator from coming into contact with the high-temperature exhaust gas purification device 74, while the atmosphere around the exhaust gas purification device 74 can be maintained at a high temperature by the heat discharged from the engine 14. Further, since the heat insulator 260 is attached to the purifying device installation recess 7a of the grain tank 7, the influence of heat generated by the exhaust gas purifying device 74 on the inside of the grain tank 7 can be reduced.

As shown in fig. 39, in order to suppress heating of the grain tank 7 by the exhaust gas purification device 74 as a high-temperature heat source, a heat insulating plate 262 may be provided to extend from the right edge of the support table 250 toward the upper side of the exhaust gas purification device 74 in addition to the heat insulating material 260. That is, by providing the heat insulating plate 262 between the left side surface of the grain tank 7 and the right side surface of the exhaust gas purification device 74, the heat radiated from the exhaust gas purification device 74 is insulated by the heat insulating plate 262, and thus the grain tank 7 can be prevented from being heated by the exhaust gas purification device 74.

Description of the reference numerals

5 threshing device

7 grain box

10 driver's cabin

31 fuel tank

14 diesel engine

74 exhaust gas purification device

75 first case

81 purification inlet pipe (waste gas intake)

82 purifying outlet pipe (waste gas outlet)

83 tail pipe

91 engine room frame

92 left support column (Back side frame)

94 horizontal frame (Back side frame)

97 Engine room

174 urea water tank

175 urea water supply device

229 second case

236 SCR inlet pipe (waste gas intake)

237 SCR outlet pipe (exhaust outlet)

239 urea mixing pipe

Claims

1. A combine harvester is provided with: a threshing device; an engine that drives the threshing device; an exhaust gas purification device including a first casing for removing particulate matter from the exhaust gas of the engine and a second casing for removing nitrogen oxide from the exhaust gas of the engine; an engine room in which the engine is built; and a grain tank for the input of harvested grain,

the combine-harvester is characterized in that,

at least a second casing of an exhaust gas treatment device is disposed at a front portion of the grain tank at a position facing the threshing device side of the engine room.

2. A combine harvester according to claim 1,

a tail pipe is connected to the second casing, and the tail pipe is disposed so as to face upward of the machine body.

3. A combine harvester is provided with: a threshing device; an engine that drives the threshing device; an engine room in which the engine is built; and a grain tank for the input of harvested grain,

the combine-harvester is characterized in that,

an air cleaner is disposed above the engine room, and a precleaner connected to the engine room via an intake duct is disposed above the air cleaner and outside the engine room.